Patent EA-000159-B1 (EA)
Title: A motion mechanism for converting reciprocating motion unto rotary motion and vice versa
IPC: F02B75/32
Filed: 1997-04-03
Abstract: 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 pivotally coupled to said housing, wherein said 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. A 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. A 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 axial velocity of said reciprocatory member in the vicinity of the top dead center position thereof. 4. A 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. A mechanism according to Claim 1, wherein all said pivotal couplings are along axes parallel to each other and perpendicular to said longitudinal axis. 6. A 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. A mechanism according to Claim 6, wherein piston is pivotally connected to said first end of reciprocatory member. 8. A mechanism according to Claim 6, wherein rotary member is coupled to a driving device for driving piston-cylinder assembly in a fluid pump. 9. A mechanism according to Claim 6, wherein said piston-cylinder assembly constitutes a drive device for driving said rotary member. 10. A mechanism according to Claim 9, wherein said piston-cylinder assembly drive is in a fluid motor utilizing a pressurized fluid for driving said rotary member. 11. A mechanism according to Claim 12, wherein said piston-cylinder drive is in a gasoline engine. 12. 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 pivotally coupled to said housing, wherein 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. 13 A machine according to Claim 12, 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. 14. A machine according to Claim 12 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 axial velocity of said reciprocatory member, in the vicinity of the top dead center position thereof. 15. A machine according to Claim 12, 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. 16. A machine according to Claim 12, wherein all said pivotal couplings are along axes parallel to each other and perpendicular to said longitudinal axis. 17. A machine according to Claim 12, wherein said piston to said displaceable member and said cylinder is fixed to said housing. 18. A machine according to Claim 17, wherein said piston is pivotally coupled to said first end of said reciprocatory member. 19. A machine according to Claim 17, wherein said rotary member is coupled to a driving device for driving said piston within said cylinder of a fluid pump. 20. A machine according to Claim 17, wherein said piston-cylinder assembly constitutes a drive device for driving said rotary member. 21. A machine according to Claim 20, wherein said piston and cylinder are parts of a fluid motor utilizing a pressurized fluid for driving said rotary member. 22. A machine according to Claim 20, wherein said piston and cylinder are parts of a drive for a gasoline engine. 23. 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 pivotally coupled to said housing, wherein 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. 24. A pump according to Claim 23, 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. 25. A pump according to Claim 23, 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 axial velocity of said reciprocatory member, in the vicinity of the top dead center position of said reciprocatory member. 26. A pump according to Claim 25, 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. 27. A pump according to Claim 23, wherein said fluid pump is a double-acting pump in which said reciprocatory member is coupled to a piston at each of the opposite ends of said reciprocatory member and drives said pistons within cylinders fixed to said housing at the opposite ends of said reciprocatory member. 28. A pump according to Claim 31, wherein said cylinder at one end of said reciprocatory member is fluidly coupled to, and is of larger volume than, said cylinder at the opposite end of said reciprocatory member. 29. A motor for driving a load, 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