Ultrasonic wave generator

• US 4,074,152 A
• Filed: 09/30/1975
• Issued: 02/14/1978
• Est. Priority Date: 09/30/1974
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho (Toyota Motor Corporation)
• Original Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho (Toyota Motor Corporation)
• Inventors: Takeuchi, Akihiro, Asai, Kiyokazu
• Primary Examiner(s): Budd, Mark O.
• Application Number:
  US05/620,059
• Time in Patent Office: 868 Days
• Field of Search: 310/8, 310/8.2, 310/8.3, 310/8.7, 310/26, 116/237 A, 116/DIG. 19, 73/67.2, 259/1 R, 259/DIG. 15, 259/DIG. 41, 259/DIG. 44, 239/4, 239/102
• US Class Current: 310/334
• CPC Class Codes: B06B 1/0618 of piezo- and non-piezoelectric elements, e.g. 'Tonpilz'
• CPC Class Codes: B06B 3/00 Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
• CPC Class Codes: B08B 7/028 Using ultrasounds
• CPC Class Codes: B08B 9/027 Cleaning the internal surfaces; Removal of blockages

Abstract

An ultrasonic wave generator includes an ultrasonic oscillator, an ultrasonic wave transducer connected to the oscillator, a mechanical vibration amplifying member, and an ultrasonic vibratory member. An increased thickness portion, which projects from a portion of the circumferential surface of the ultrasonic vibratory member and from a side wall portion of the mechanical vibration amplifying member at a connecting portion of the ultrasonic vibratory member and the mechanical vibration amplifying member, is integrally formed upon the ultrasonic vibratory member and the mechanical vibration amplifying member whereby the cross-sectional area of the connecting portion between the ultrasonic vibratory member and mechanical vibration amplifying member is gradually changed. With this improvement, the mechanical strength of the connecting portion between the ultrasonic vibratory member and the mechanical vibration amplifying member is increased, the positive transmission of the ultrasonic waves from the mechanical vibration amplifying member to the ultrasonic vibratory member is insured, fatigue failure and cracking of the connecting portion is effectively prevented, and the ultrasonic waves are generated from the ultrasonic vibratory member in a stable manner for a long period of time.

Claims

1. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive trnasmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said mechanical vibration amplifying member and said vibratory member form two separate members;

said vibratory member of said hollow cylindrical body having a predetermined wall thickness and being integrally secured to the other end of said mechanical vibration amplifying member upon its outer circumferential surface; and

said increased thickness portion is a rib structure provided on at least one of the joint portions of said vibratory member and said mechanical vibration amplifying member along a side wall surface thereof,

whereby said vibratory member is integrally coupled to said mechanical vibration amplifying member through means of said rib structure, and the mechanical strength of said joint portion between said ultrasonic vibratory member and mechanical vibration amplifying member is increased;

said rib structure of said increased thickness portion is integrally formed upon said joint portion of said vibratory member and said mechanical-vibration amplifying member along said outer circumferential surface of said vibratory member in a direction parallel with the longitudinal axis of said vibratory member;

said ultrasonic vibratory member comprises a hollow cylinder provided with said rib structure which has a triangular columnar projection configuration, is integral with the cylindrical wall of said vibratory member, and extends in a direction parallel with the longitudinal axis of said cylindrical body over the entire axial length thereof.

2. An ultrasonic wave generator according to claim 1, wherein:

said rib structure has a bore for housing bolt means therethrough in order to secure said ultrasonic vibratory member to said mechanical vibration amplifying member;

said mechanical vibration amplifying member comprises a stepped type horn; and

said ultrasonic wave transducer comprises piezoelectric elements.

3. An ultrasonic wave generator according to claim 2, wherein:

said mechanical vibration amplifying member has an output end which is formed with a recessed portion adapted to matingly engage said triangular columnar projection of said ultrasonic vibratory member and a flange formed on the root portion thereof which is secured to a flange of a cylindrical backing metal block,

said piezoelectric elements, a spacer plate and an electrode plate being interposed and secured between said flanges by a plurality of bolts.

4. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator,

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said cicumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive transmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said mechanical vibration amplifying member and said vibratory member form two separate members;

said vibratory member of said hollow cylindrical body having a predetermined wall thickness and being integrally secured to the other end of said mechanical vibration amplifying member upon its outer circumferential surface; and

said increased thickness portion is a rib structure provided on at least one of the joint portions of said vibratory member and said mechanical vibration amplifying member along a side wall surface thereof,

whereby said vibratory member is integrally coupled to said mechanical vibration amplifying member through means of said rib structure, and the mechanical strength of said joint portion between said ultrasonic vibratory member and mechanical vibration amplifying member is increased;

said rib structure of said increased thickness portion is integrally formed upon said joint portion of said vibratory member and said mechanical-vibration amplifying member along said outer circumferential surface of said vibratory member in a direction parallel with the longitudinal axis of said vibratory member;

said ultrasonic vibratory member comprises a hollow cylinder which includes said rib structure of a triangular columnar projection configuration and which is integral with the cylindrical wall of said vibratory member and which extends in a direction parallel with the longitudinal axis of said cylindrical body over the entire axial length thereof;

said mechanical vibration amplifying member comprises a stepped type horn including an amplified mechanical vibration output portion supporting said ultrasonic vibratory member, a flange portion, and a mechanical vibration input portion; and

said ultrasonic wave transducer comprises a first cylindrical body secured to said mechanical vibration input portion of said mechanical vibration amplifying member, a second cylindrical body, and circular piezoelectric elements and an electrode plate sandwiched between said first and second cylindrical bodies.

13. An ultrasonic wave generator according to claim 4, wherein:

said ultrasonic vibratory member is secured to said amplified mechanical vibration output portion by bolt means;

said mechanical vibration input portion of said mechanical vibration amplifying member is secured to said first cylindrical body of said ultrasonic wave transducer by bolt means; and

said first cylindrical body, said second cylindrical body, said circular piezoelectric elements, and said electrode plate of said ultrasonic wave transducer are integrally secured together by adhesive means.

5. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive trnasmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said mechanical vibration amplifying member and said vibratory member form two separate members;

said vibratory member of said hollow cylindrical body having a predetermined wall thickness and being integrally secured to the other end of said mechanical vibration amplifying member upon its outer circumferential surface; and

said increased thickness portion is a rib structure provided on at least one of the joint portions of said vibratory member and said mechanical vibration amplifying member along a side wall surface thereof,

whereby said vibratory member is integrally coupled to said mechanical vibration amplifying member through means of said rib structure, and the mechanical strength of said joint portion between said ultrasonic vibratory member and mechanical vibration amplifying member is increased;

said rib structure of said increased thickness portion is integrally formed upon said joint portion of said vibratory member and said mechanical-vibration amplifying member along said outer circumferential surface of said vibratory member in a direction parallel with the longitudinal axis of said vibratory member;

said ultrasonic vibratory member comprises a hollow cylinder having a triangular columnar projection which is integral with the cylindrical wall thereof and which extends in a direction parallel with the longitudinal axis thereof over the entire axial length thereof, an axially extending slit-like opening, extending over the entire length thereof, being defined within said cylindrical wall.

6. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive transmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said mechanical vibration amplifying member and said vibratory member form two separate members;

said vibratory member of said hollow cylindrical body having a predetermined wall thickness and being integrally secured to the other end of said mechanical vibration amplifying member upon its outer circumferential surface; and

said increased thickness portion is a rib structure provided on at least one of the joint portions of said vibratory member and said mechanical vibration amplifying member along a side wall surface thereof;

whereby said vibratory member is integrally coupled to said mechanical vibration amplifying member through means of said rib structure, and the mechanical strength of said joint portion between said ultrasonic vibratory member and mechanical vibration amplifying member is increased;

said rib structure of said increased thickness portion is integrally formed upon said joint portion of said mechanical vibration amplifying member and said rib structure extends along the outer circumferential surface of said vibratory member;

said ultrasonic vibratory member comprises a hollow cylinder having a small wall thickness and made of a light alloy;

said mechanical vibration amplifying member comprises a stepped type horn, secured to an outer cylindrical wall of said hollow cylinder by brazing, having a rectangular cross section of substantially the same longitudinal length as said axial length of said vibratory member, and having a fillet portion as said rib structure with a curvature such that the increased thickness portion tangentially contacts the outer circumferential surface of said vibratory member, whereby the outer portion of said horn having said rectangular cross section smoothly engages said vibratory member; and

said ultrasonic wave transducer comprises piezoelectric elements sandwiched and secured between two cylindrical metal blocks by means of bolts, and said transducer is secured to said stepped type horn.

7. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive transmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said mechanical vibration amplifying member and said vibratory member form two separate members;

said vibratory member of said hollow cylindrical body having a predetermined wall thickness and being integrally secured to the other end of said mechanical vibration amplifying member upon its outer circumferential surface; and

said increased thickness portion is a rib structure provided on at least one of the joint portions of said vibratory member and said mechanical vibration amplifying member along a side wall surface thereof,

whereby said vibratory member is integrally coupled to said mechanical vibration amplifying member through means of said rib structure, and the mechanical strength of said joint portion between said ultrasonic vibratory member and mechanical vibration amplifying member is increased;

said rib structure of said increased thickness portion is integrally formed along said outer circumferential surface of said vibratory member and upon both joint portions of said vibratory member and said mechanical vibration amplifying member;

said ultrasonic vibratory member comprising a hollow cylinder having a triangular columnar projection which is integral with the cylindrical wall of said vibratory member and which extends in a direction parallel with the longitudinal axis thereof over the entire axial length thereof;

said mechanical vibration amplifying member comprises a catenary type horn which has an output portion with a rib structure formed so as to have a predetermined radius of curvature and which is secured to said hollow cylinder by bolt means; and

said ultrasonic wave transducer comprises a first metal block, of a solid cylindrical body having a T-shaped cross section defining an extended portion, integrally connected to said horn, a second metal block of a solid hollow cylindrical body having a bottom portion, and piezoelectric elements and an electrode plate secured between said metal blocks by means of a nut disposed within an inner chamber of said second metal block and engaged with the extended portion of said first T-shaped metal block.

8. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive transmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said ultrasonic vibratory member and said other end of said mechanical vibration amplifying member form one integral member;

said ultrasonic vibratory member and said mechanical vibration amplifying member form one integral member;

said one member comprises a hollow cylinder having a triangular columnar projection which is integral with the outer cylindrical wall of said vibratory member and which extends in a direction parallel with the longitudinal axis of said cylindrical body over the entire length thereof, and an amplitude amplifying portion of a stepped type horn integrally including said connecting portion having said increased thickness portion tangentially contacting said outer circumferential surface of said hollow cylinder and a circular flange portion; and

said ultransonic wave transducer comprises a cylindrical metal block having a flange portion, and circular piezoelectric elements and an electrode plate sandwiched between said flange portions of said stepped type horn and said cylindrical metal block by a plurality of bolts which also extend through an annular spacer member interposed between said flange portions and surrounding said elements and said electrode.

9. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive transmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said ultrasonic vibratory member and said other end of said mechanical vibration amplifying member form one integral member;

said one member is integrally secured to one end of another member having the other end thereof integrally secured to said ultrasonic wave transducer by fixing means;

said one member comprises a hollow cylinder having a semi-circular columnar projection which is integral with the outer cylindrical wall thereof, and a part of an amplitude amplifying portion of said mechanical vibration amplifying member, the output portion of said mechanical vibration amplifying member of an exponential type horn including said connecting portion with said increased thickness portion tangentially contacting said outer circumferential surface of said hollow cylinder;

said another member being secured to said one member by means of a bolt, and comprising another part of said amplitude amplifying portion, having a flange portion, of said mechanical vibration amplifying member; and

said ultrasonic wave transducer comprises a cylindrical metal block having a flange portion, circular piezoelectric elements and an electrode plate sandwiched between said flange portions of said exponential type horn and said cylindrical metal block by a plurality of bolts which also extend through an annular spacer member interposed between said flange portions and surrounding said elements and said electrode.

10. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive transmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said ultrasonic vibratory member and said other end of said mechanical vibration amplifying member form one integral member;

said one member is integrally secured to one end of another member having the other end thereof integrally secured to said ultrasonic wave transducer by fixing means;

said one member comprises a hollow rectangular column, a part of an amplitude amplifying portion of said mechanical vibration amplifying member of a stepped type horn, and an output portion of said mechanical vibration amplifying member including said connecting portion with said increased thickness portion tangentially contacting said outer circumferential surface of said hollow rectangular column, and a convex portion at the end portion thereof;

said another member comprises another part of said amplitude amplifying portion, having a flange portion, of said mechanical vibration amplifying member, and having a concave portion at the end portion thereof; and

said ultrasonic wave transducer comprises a cylindrical metal block having a flange portion, circular piezoelectric elements and an electrode plate sandwiched between said flange portion of said stepped type horn and said flange portion of said cylindrical metal block by a plurality of bolts which also extend through an annular spacer member interposed between said flange portions and surrounding said elements and said electrode;

said convex portion of said one member mating with said concave portion of said another member being secured together by bolt means passing through said concave and convex portions, whereby said one and said another members are integrally formed as one body.

11. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive transmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said ultrasonic vibratory member and said other end of said mechanical vibration amplifying member form one integral member;

said one member is integrally secured to one end of another member having the other end thereof integrally secured to said ultrasonic wave transducer by fixing means;

said one member comprises a hollow cylinder having a slit like opening extending in the axial direction thereof and a triangular column projection which is integral with the outer cylindrical wall thereof and which extends in a direction parallel with the longitudinal axis over the entire length thereof, and a part of an amplitude amplifying portion of said mechanical vibration amplifying member of a stepped type horn, the output portion of said stepped type horn including said connecting portion with said increased thickness portion tangentially contacting said outer circumferential surface of said hollow cylinder and having a convex portion at the end portion thereof;

said another member comprises another part of said amplitude amplifying portion, having a flange portion, of said mechanical vibration amplifying member, and having a concave portion at the end portion thereof secured to said convex portion of said one member by bonding means such as brazing; and

said ultrasonic wave transducer comprises a magnetostrictive element within which a lead wire is wound for several turns around a U-shaped member which is secured to a cylindrical metal block of said mechanical vibration amplifying member which is in turn secured to said flange portion of said mechanical vibration amplifying member by adhesive means.

12. An ultrasonic wave generator comprising:

an ultrasonic wave oscillator;

an ultrasonic wave transducer, connected to said ultrasonic wave oscillator, for transforming an electrical oscillation from said oscillator into a mechanical vibration;

a mechanical vibration amplifying member, having one end thereof integrally secured to one end of said ultrasonic wave transducer, for amplifying the amplitude of said mechanical vibration transmitted from said ultrasonic wave transducer;

an ultrasonic vibratory member of a hollow cylindrical body which is open at both ends thereof, which has a side circular wall having a predetermined length between said ends and a constant predetermined wall thickness in the axial direction thereof, and which has its outer circumferential surface integrally connected to the other end of said mechanical vibration amplifying member, with the longitudinal axis thereof being disposed perpendicularly to the longitudinal axis of said mechanical vibration amplifying member; and

an increased thickness portion which projects from said circumferential surface of said ultrasonic vibratory member and/or from a side wall portion of said mechanical vibration amplifying member at the connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member, and which is integrally formed upon said ultrasonic vibratory member and said mechanical vibration amplifying member in such a manner that the cross-sectional area of said connecting portion of said ultrasonic vibratory member and said mechanical vibration amplifying member gradually changes,

whereby the mechanical strength of said connecting portion between said ultrasonic vibratory member and said mechanical vibration amplifying member is increased so as to prevent fatigue failure and cracking within said connecting portion, and the positive transmission of ultrasonic waves from said mechanical vibration amplifying member to said ultrasonic vibratory member is insured so as to generate ultrasonic waves from said ultrasonic vibratory member in a stable manner for a long period of time;

said ultrasonic vibratory member and said other end of said mechanical vibration amplifying member form one integral member;

said one member is integrally secured to one end of another member having the other end thereof integrally secured to said ultrasonic wave transducer by fixing means;

said one member and said another member have elongated bores having threaded wall portions provided in such a manner as to extend through said one and another members in the axial direction and in coaxial relation with respect to each other; and

said fixing means comprises bolt means having a threaded portion and extending substantially the entire length of said one and said another members for integrally securing said one and said another members to each other;

said one member comprises a hollow cylinder having a rectangular columnar projection which is integral with the outer cylindrical wall thereof and which extends in a direction parallel with the longitudinal axis and over the entire length thereof, a part of an amplitude amplifying portion of a stepped type horn of said mechanical vibration amplifying member, said connecting portion including said increased thickness portion tangentially contacting said outer circumferential surface of said hollow cylinder and having arcuate cuts defined in a manner to be smoothly united with said outer circumferential surface of said hollow cylinder and positioned in opposing relation with respect to each other, said cuts also extending axially of said vibratory member, a threaded bore being coaxially provided within said one member and extending along the entire length thereof;

said another member comprises another part of said amplitude amplifying portion, having a flange portion, of said mechanical vibration amplifying member and including a threaded bore coaxially provided within said another member extending along the entire length thereof;

said one and said another members are secured together by a bolt having a length equal to the length of said bores within said one and said another members; and

said ultrasonic wave transducer comprises a cylindrical metal block having a flange portion, circular piezoelectric elements and an electrode plate being sandwiched between said flange portions of said stepped type horn and said cylindrical metal block and secured therein by a plurality of bolts which also extend through an annular spacer member interposed between said flange portions and surrounding said elements and said electrode.