Reciprocating machine

• US 5,762,480 A
• Filed: 04/16/1996
• Issued: 06/09/1998
• Est. Priority Date: 04/16/1996
• Status: Expired due to Term

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Carmeli Adahan
• Inventors: Adahan, Carmeli
• Primary Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US08/632,838
• Time in Patent Office: 784 Days
• Field of Search: 417/359, 417/415, 417/534, 417/566, 417/571, 123/197.3, 123/197.4, 74/40, 92/138, 92/140
• US Class Current: 417/415
• CPC Class Codes: F01B 9/02 with crankshaft
• CPC Class Codes: F02B 75/32 Engines characterised by connections between pistons and main shafts and not specific to preceding main groups
• CPC Class Codes: F04B 9/02 the means being mechanical
• CPC Class Codes: F04B 9/045 the means being eccentrics
• CPC Class Codes: F16H 21/32 with additional members comprising only pivoted links or arms
• CPC Class Codes: Y10T 74/18176 Crank, pitman, lever, and slide

Abstract

A reciprocating machine converts linear motion to rotary motion or vice-versa and is associated with a supply of working fluid, and includes rotational power apparatus having a rotational motion transfer member; a cylinder defining a longitudinal axis and having a first end at which are located working fluid input and output apparatus, and further having a second end; a piston located within the cylinder and arranged for linear, reciprocating travel along the longitudinal axis between the first and second ends; a connecting rod having a first end connected to the piston, and further having a second end portion; and linkage apparatus.

Claims

1. A motion converter mechanism to be interposed between a driving device and a driven device to provide a rotary motion in one device and a reciprocatory motion in the other device, comprising:

a housing;

a reciprocatory member mounted for reciprocatory movement along a longitudinal axis and having a first end coupleable to one of the devices;

a rotary member mounted for rotary movement about a rotary axis and coupleable to the other of the devices;

a crank arm having a first end pivotally coupled to said rotary member and a second end pivotally coupled to said reciprocatory member;

and an alignment member extending transversely of said longitudinal axis and having a first end pivotally coupled to said reciprocatory member and a second end pivotally coupled to said housing such as to maintain said reciprocatory member in general coaxial alignment with said longitudinal axis, and thereby substantially to prevent side loading of said reciprocatory member during its reciprocatory movements.

2. The mechanism according to claim 1, wherein:

said reciprocatory member includes a transverse extension;

said second end of said crank arm is pivotally coupled to said reciprocatory member at its juncture with said transverse extension;

and said first end of said alignment member is pivotally coupled to an outer end of said transverse extension of said reciprocatory member.

3. The mechanism according to claim 1, wherein said rotary axis of said rotary member is located such that, in the vicinity of the top dead center position of said reciprocatory member, said first end of said crank arm is aligned with said longitudinal axis of said reciprocatory member at a location between said first end of said reciprocatory member and said pivotal coupling thereof to said second end of said crank arm, thereby effecting a reduction in the linear velocity of said reciprocatory member in the vicinity of the top dead center position thereof.

4. The mechanism according to claim 3, wherein said rotary axis of said rotary member is selectively positionable at a predetermined location laterally of said longitudinal axis of said reciprocatory member so as to change the magnitude of displacements of said reciprocatory member during reciprocatory movements thereof.

5. The mechanism according to claim 1, wherein all said pivotal couplings are along axes parallel to each other and perpendicular to said longitudinal axis.

6. The mechanism according to claim 1, wherein said first end of said reciprocatory member is coupled to a piston movable within a cylinder of a piston-cylinder assembly.

7. The mechanism according to claim 6, wherein said piston is pivotally connected to said first end of said reciprocatory member.

8. The mechanism according to claim 6, wherein said rotary member is coupled to a driving device for driving said piston-cylinder assembly in a fluid pump.

9. The mechanism according to claim 8, wherein said fuel pump is a double-acting pump in which said reciprocatory member is coupled at a first end thereof to a piston-cylinder assembly, a second end of said reciprocatory member being arranged for motion within a cylindrical extension of the cylinder of said piston-cylinder assembly.

10. The mechanism according to claim 9, wherein the cylinder in the piston-cylinder assembly is fluidly coupled to and is of larger volume than, said cylindrical extension thereof the piston assembly at the opposite end of said reciprocatory.

11. The mechanism according to claim 6, wherein said piston-cylinder assembly constitutes a drive device for driving said rotary member.

12. The mechanism according to claim 11, wherein said piston-cylinder assembly drive is in a fluid motor utilizing a pressurized fluid for driving said rotary member.

13. A reciprocatory machine, comprising:

a housing;

a piston-cylinder assembly including a cylinder and a piston, one of which is a member fixed to said housing, and the other of which is a member displaceable along a longitudinal axis of said fixed member;

a reciprocatory member having a first end coupled to said displaceable member and reciprocable along said longitudinal axis;

a rotary member mounted for rotary movement about a rotary axis;

a crank arm having a first end pivotally coupled to said rotary member and a second end pivotally coupled to said reciprocatory member;

and an alignment member extending transversely of said longitudinal axis and having a first end pivotally coupled to said reciprocatory member and a second end pivotally coupled to said housing such as to maintain said reciprocatory member in general coaxial alignment with said longitudinal axis, and thereby substantially to prevent side loading of said reciprocatory member during its reciprocatory movements.

14. The machine according to claim 13, wherein:

said reciprocatory member includes a transverse extension;

said second end of said crank arm is pivotally coupled to said reciprocatory member at its juncture with said transverse extension;

and said first end of said alignment member is pivotally coupled to an outer end of said transverse extension of said reciprocatory member.

15. The machine according to claim 13 wherein said rotary axis of said rotary member is located such that, in the vicinity of the top dead center position of said reciprocatory member, said first end of said crank arm becomes aligned with said longitudinal axis of said reciprocatory member at a location between said first end of said reciprocatory member and its pivotal coupling to said second end of said crank arm thereby effecting a reduction in the linear velocity of said reciprocatory member, in the vicinity of the top dead center position thereof.

16. The machine according to claim 15, wherein said rotary axis of said rotary member is selectively positionable at a predetermined location laterally of said longitudinal axis of said reciprocatory member to change the magnitude of displacements of said reciprocatory member during its reciprocatory movements.

17. The machine according to claim 13, wherein all said pivotal couplings are along axes parallel to each other and perpendicular to said longitudinal axis.

18. The machine according to claim 13, wherein said piston to said displaceable member and said cylinder is fixed to said housing.

19. The machine according to claim 18, wherein said piston is pivotally coupled to said first end of said reciprocatory member.

20. The machine according to claim 18, wherein said rotary member is coupled to a driving device for driving said piston within said cylinder of a fluid pump.

21. The machine according to claim 20, wherein said fluid pump is a double-acting pump in which said reciprocatory member is coupled at a first end thereof to a piston and drives said piston within a cylinder fixed to said housing at said first end of said reciprocatory member, a second end of said reciprocatory member being arranged for motion within a cylindrical extension of the cylinder of said piston-cylinder assembly.

22. The machine according to claim 21, wherein said cylinder is fluidly coupled to, and is of larger volume than, said cylindrical extension thereof.

23. The machine according to claim 22, wherein said piston and cylinder are parts of a fluid motor utilizing a pressurized fluid for driving said rotary member.

24. The machine according to claim 13, wherein said piston-cylinder assembly constitutes a drive device for driving said rotary member.

25. A reciprocatory pump, comprising:

a housing;

a piston-cylinder assembly including a cylinder and a piston, one of which members is fixed to said housing, and the other of which members is displaceable along a longitudinal axis of said fixed- member for pumping a fluid;

a reciprocatory member having a first end coupled to said displaceable member and reciprocable along said longitudinal axis;

a rotary member mounted for rotary movement about a rotary axis and coupled to a drive;

a crank arm having a first end pivotally coupled to said rotary member and a second end pivotally coupled to said reciprocatory member;

and an alignment member extending transversely of said longitudinal axis and having a first end pivotally coupled to said reciprocatory member and a second end pivotally coupled to said housing such as to maintain said reciprocatory member in general coaxial alignment with said longitudinal axis, and thereby substantially to prevent side loading of said reciprocatory member during its reciprocatory movements.

26. The pump according to claim 25, wherein:

said reciprocatory member includes a transverse extension,

said second end of said crank arm is pivotally coupled to said reciprocatory member at its juncture with said transverse extension;

and said first end of said alignment member is pivotally coupled to the outer end of said transverse extension of said reciprocatory member.

27. The pump according to claim 25, wherein said rotary axis of said rotary member is located such that, in the vicinity of the top dead center position of said reciprocatory member, said first end of said crank arm becomes aligned with said longitudinal axis of said reciprocatory member at a location between said first end of said reciprocatory member and its pivotal coupling to said second end of said crank arm thereby effecting a reduction in the linear velocity of said reciprocatory member, in the vicinity of the top dead center position of said reciprocatory member.

28. The pump according to claim 27, wherein said rotary axis of said rotary member is selectively positionable at a predetermined location laterally of said longitudinal axis of said reciprocatory member to change the magnitude of displacements of said reciprocatory member during its reciprocatory movements.

29. The pump according to claim 25, wherein said fluid pump is a double-acting pump in which said reciprocatory member is coupled at a first end thereof to a piston and drives said piston within a cylinder fixed to said housing at said first end of said reciprocatory member, a second end of said reciprocatory member being arranged for motion within a cylindrical extension of the cylinder of said piston-cylinder assembly.

30. The pump according to claim 29, wherein said cylinder is fluidly coupled to, and is of larger volume than, said cylindrical extension thereof.

31. A motor for driving a load, comprising:

a housing;

a piston-cylinder assembly including a cylinder member and a piston, one of which is a member fixed to said housing, and the other of which is a member displaceable along a longitudinal axis of said fixed member and serves as a drive for said motor,

a reciprocatory member having a first end coupled to said displaceable member and reciprocable along said longitudinal axis;

a rotary member mounted for rotary movement about a rotary axis and coupled to the load;

a crank arm having a first end pivotally coupled to said rotary member and a second end pivotally coupled to said reciprocatory member;

and an alignment member extending transversely of said longitudinal axis and having a first end pivotally coupled to said reciprocatory member and a second end pivotally coupled to said housing such as to maintain said reciprocatory member in general coaxial alignment with said longitudinal axis, and thereby substantially to prevent side loading of said reciprocatory member during its reciprocatory movements.

32. The motor according to claim 31, wherein:

said reciprocatory member includes a transverse extension;

said second end of said crank arm is pivotally coupled to said reciprocatory member at its juncture with said transverse extension; and

said first end of said alignment member is pivotally coupled to the outer end of said transverse extension of said reciprocatory member.

33. The motor according to claim 31, wherein said rotary axis of said rotary member is located such that, in the vicinity of the top dead center position of said reciprocatory member, said first end of said crank arm becomes aligned with said longitudinal axis of said reciprocatory member at a location between said first end of said reciprocatory member and its pivotal coupling to said second end of said crank arm thereby effecting a reduction in the linear velocity of said reciprocatory member, in the vicinity of the top dead center position of said reciprocatory member.

34. The motor according to claim 31, wherein said piston is said displaceable member and said cylinder is fixed to said housing.