Vibration isolating apparatus

• US 5,738,343 A
• Filed: 06/27/1997
• Issued: 04/14/1998
• Est. Priority Date: 04/03/1990
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation), TOYO Tire & Rubber Company Limited (Toyo Tire Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation), TOYO Tire & Rubber Company Limited (Toyo Tire Corporation)
• Inventors: Shimahara, Yoichi, Nakajima, Zenji
• Primary Examiner(s): Young, Lee W.
• Application Number:
  US08/884,313
• Time in Patent Office: 291 Days
• Field of Search: 267/140.11, 267/140.13, 267/140.14, 267/140.15, 267/140.3, 267/141, 267/141.2, 267/220, 267/35, 267/153, 267/219, 188/322.11, 248/550, 248/636
• US Class Current: 267/219
• CPC Class Codes: F16F 13/26 characterised by adjusting or regulating devices responsive to exterior conditions F16F13/101 takes precedence
• CPC Class Codes: F16F 15/005 using electro- or magnetostrictive actuation means generating of mechanical vibrations operating with electrostriction B06B1/06, with magnetostriction B06B1/08; vehicle suspension arrangements characterised by use of piezoelectric elements B60G17/01941; piezoelectric, electrostrictive and magnetostrictive devices per se H10N30/00
• CPC Class Codes: F16F 2230/0047 Measuring, indicating

Abstract

The vibration isolation device of this invention is to be interposed between a vibrating body and a vibrated body, characterized in that at least one of the vibrating body and the vibrated body is fastened to the surface of a vibration isolating device which is abutted against it through a piezoelectric insert interposed constant K! which is represented by a particular formula or a fastener which is capable of piezoelectric displacement.

Claims

1. A vibration isolating apparatus to be interposed between a vibrating body and a vibrated body, comprising:

a vibration isolating device;

a piezoelectric insert;

said piezoelectric insert being interposed between and in substantially inelastic engagement with said vibration isolating device and at least one of the vibrating body and the vibrated body;

a fastener means for coupling together said vibration isolating device and said at least one of the vibrating body and the vibrated body, said fastener means having a spring constant K;

said fastener means including a resilient member to effect an elastic coupling of said vibration isolating device and said at least one of the vibrating body and the vibrated body, said resilient member being disposed outside a path of engagement of said piezoelectric insert with said vibration isolating device and said at least one of the vibrating body and the vibrated body, said spring constant K being represented by the following formula;

##EQU2## where;

α

=1if γ

≦

1,

α

=γ

if γ

>

1,

γ

=γ

_L /γ

_D, γ

_L =L₁ /Lmax,

γ

_D =Dr/Dmax,

K!;

the spring constant of a fastener means,

Lmax;

a maximum output force of the piezoelectric insert,

Dmax;

a maximum displacement of the piezoelectric insert,

Dr;

a required amount of displacement of the piezoelectric insert,

L₁ ;

a sum of a loading force and a fastening force which act on the piezoelectric insert; and

said piezoelectric insert expanding and contracting to effect a size displacement of said piezoelectric insert equal to said required amount of displacement of the piezoelectric insert Dr which in turn effects a displacement of said vibration isolating device relative to said at least one of the vibrating body and the vibrated body equal to said required amount of displacement of the piezoelectric insert Dr.

2. A vibration isolating apparatus of claim 1 wherein the spring constant of said resilient member is a determinant factor in said spring constant K! of the fastener means as a whole.

3. A vibration isolating apparatus to be interposed between a first mounting frame on a vibrating body and a second mounting frame on a vibrated body, comprising:

a vibration isolating device;

a piezoelectric insert;

said piezoelectric insert being interposed between and in substantially inelastic engagement with said vibration isolating device and at least one of said first mounting frame and said second mounting frame;

a resilient member disposed on a side of said at least one of said first mounting frame and said second mounting frame which is opposite a side facing said piezoelectric insert;

said vibration isolating device, said piezoelectric insert, said at least one of said first mounting frame and said second mounting frame, and said resilient member being fastened with a setbolt and a nut, said setbolt and nut together with said resilient member constituting a fastener means having a spring constant K which is represented by the following formula;

##EQU3## where;

α

=1if γ

≦

1,

α

=γ

if γ

>

1,

γ

=γ

_L /γ

_D, γ

_L =L₁ /Lmax,

γ

_D =Dr/Dmax,

K;

the spring constant of the fastener means,

Lmax;

a maximum output force of the piezoelectric insert,

Dmax;

a maximum displacement of the piezoelectric insert,

Dr;

a required amount of displacement of the piezoelectric insert,

L₁ ;

a sum of a loading force and a fastening force which act on the piezoelectric insert; and

said piezoelectric insert expanding and contracting to effect a size displacement of said piezoelectric insert equal to said required amount of displacement of the piezoelectric insert Dr which in turn effects a displacement of said vibration isolating device relative to said at least one of the vibrating body and the vibrated body equal to said required amount of displacement of the piezoelectric insert Dr.

4. A vibration isolating apparatus to be interposed between a first mounting frame on a vibrating body and a second mounting frame on a vibrated body, comprising:

a piezoelectric insert;

said piezoelectric insert being interposed between and in substantially inelastic engagement with said vibration isolating device and at least one of said first mounting frame and the second mounting frame;

a piezoelectric member, capable of piezoelectric displacement, disposed on a side of said at least one of said first mounting frame and said second mounting frame which is opposite a side of said at least one of said first mounting frame and said second mounting frame facing said piezoelectric insert;

said vibration isolating device, said piezoelectric insert, said at least one of said first mounting frame and second mounting frame, and said piezoelectric member being fastened with a setbolt and a nut; and

said piezoelectric insert expanding and contracting in conjunction with said piezoelectric member contracting and expanding, respectively, to effect a size displacement of said piezoelectric insert equal to a required amount of displacement of the piezoelectric insert which in turn effects a displacement of said vibration isolating device relative to said at least one of the vibrating body and the vibrated body equal to said required amount of displacement of the piezoelectric insert.

5. A vibration isolating apparatus comprising:

a damping device capable of piezoelectric displacement, said damping device being disposed between a vibrating body and a vibrated body;

a piezoelectric insert capable of piezoelectric displacement;

fastening means for fastening at least one of the vibrating body and the vibrated body to a surface of said damping device said piezoelectric insert interposed therebetween;

said fastening means including a resilient member to effect an elastic coupling of said damping device and said at least one of the vibrating body and the vibrated body, said resilient member being disposed outside a path of engagement of said piezoelectric insert with said damping device and said at least one of the vibrating body and the vibrated body;

said fastening means having a spring constant which is represented by the following formula;

##EQU4## where;

α

=1if γ

≦

1,

α

=γ

if γ

>

1,

γ

=γ

_L /γ

_D, γ

_L =L₁ /Lmax,

γ

_D =Dr/Dmax,

K;

the spring constant of the fastener means,

Lmax;

a maximum output force of the piezoelectric insert,

Dmax;

a maximum displacement of the piezoelectric insert,

Dr;

a required amount of displacement of the piezoelectric insert,

L₁ ;

a sum of a loading force and a fastening force which act on the piezoelectric insert; and

said piezoelectric insert expanding and contracting to effect a size displacement of said piezoelectric insert equal to said required amount of displacement of the piezoelectric insert Dr which in turn effects a displacement of said vibration isolating device relative to said at least one of the vibrating body and the vibrated body equal to said required amount of displacement of the piezoelectric insert Dr.

6. The vibration isolating apparatus of claim 5, further comprising means for mounting on at least one of the vibrating body and the vibrated body, said damping device being fastened to said mounting means by said fastening means, said piezoelectric insert being disposed between said damping device and said mounting means, and said resilient member being disposed on a side of said mounting means opposite said piezoelectric insert.

7. The vibration isolating apparatus of claim 5, wherein said resilient member is a piezoelectric member capable of piezoelectric displacement.

8. The vibration isolating apparatus of claim 7, wherein said piezoelectric insert is vibrated in a phase opposite to the vibrating body and said piezoelectric member is vibrated in a phase opposite to said piezoelectric insert.

9. A vibration isolating apparatus comprising:

a damping device incapable of piezoelectric displacement, said damping device being disposed between a vibrating body and vibrated body;

a piezoelectric insert capable of piezoelectric displacement;

fastening means for fastening at least one of the vibrating body and the vibrated body to a surface of said damping device with said piezoelectric insert interposed therebetween;

said fastening means including a resilient member, to effect an elastic coupling of said damping device and said at least one of the vibrating body and the vibrated body, said resilient member being disposed outside a path of engagement of said piezoelectric insert with said damping device and said at least one of the vibrating body and the vibrated body; and

said piezoelectric insert expanding and contracting to effect a size displacement of said piezoelectric insert equal to a required amount of displacement of the piezoelectric insert which in turn effects a displacement of said damping device relative to said at least one of the vibrating body and the vibrated body equal to said required amount of displacement of the piezoelectric insert.

10. A vibration isolating apparatus comprising:

a damping device incapable of piezoelectric displacement, said damping device being disposed between a vibrating body and vibrated body;

a piezoelectric insert capable of piezoelectric displacement;

fastening means for fastening at least one of the vibrating body and the vibrated body to a surface of said damping device with said piezoelectric insert interposed therebetween;

said fastening means including a piezoelectric member to effect an active coupling of said damping device and said at least one of the vibrating body and the vibrated body, said piezoelectric member being disposed outside a path of engagement of said piezoelectric insert with said damping device and said at least one of the vibrating body and the vibrated body; and

said piezoelectric insert expanding and contracting in conjunction with said piezoelectric member contracting and expanding, respectively, to effect a size displacement of said piezoelectric insert equal to a required amount of displacement of the piezoelectric insert which in turn effects a displacement of said damping device relative to said at least one of the vibrating body and the vibrated body equal to said required amount of displacement of the piezoelectric insert.