Variable geometry power transfer for fluid flow machines

Abstract

A fluid flow machine includes a casing including a cylinder and a crankshaft support. A piston is slidably disposed in the cylinder for reciprocating along an axis of the cylinder. A crankshaft includes a main bearing journal rotationally supported in the crankshaft support, a crankpin radially offset from an axis of the main bearing journal and a crank web connecting the main bearing journal and the crankpin. A multi-linkage connecting rod mechanism is connected between the piston and crankpin and includes a connecting rod, a first hinge link and a crankpin link pivotally connected to each other. A force transfer mechanism connects the multi-linkage connecting rod mechanism to the casing for transferring a vertical piston force into a horizontal crankpin force.

1 . A fluid flow machine, comprising:
 a casing including a cylinder and a crankshaft support;   a piston slidably disposed in the cylinder for reciprocating along an axis of the cylinder;   a crankshaft including a main bearing journal rotationally supported in the crankshaft support, a crankpin radially offset from an axis of the main bearing journal and a crank web connecting the main bearing journal and the crankpin;   a multi-linkage connecting rod mechanism comprising:
 a connecting rod having a first end connected to the piston and a second end opposite the first end, the connecting rod for reciprocating with the piston; 
 a first hinge link including a first end pivotally connected to the connecting rod second end and a second end opposite the first hinge link first end; 
 a crankpin link including a first end pivotally connected to the first hinge link second end and a second end rotationally connected to the crankpin; 
   a force transfer mechanism connecting the multi-linkage connecting rod mechanism to the casing for transferring a vertical piston force into a horizontal crankpin force.   
     
     
         2 . The fluid flow machine of  claim 1  and further comprising:
 wherein the multi-linkage connecting rod mechanism further comprises: 
 a second hinge link including a first end pivotally connected to the first hinge link second end and a second end, opposite the second hinge link first end, pivotally connected to the crankpin link first end; 
 wherein the force transfer mechanism further comprises: 
 a pivot link including a first end pivotally connected to the casing and a second end pivotally connected to the multi-linkage connecting rod mechanism. 
 
     
     
         3 . The fluid flow machine of  claim 2  and further comprising:
 wherein the multi-linkage connecting rod mechanism further comprises: 
 a third hinge link connecting the crankpin link to the second hinge link, the third hinge link including a first end pivotally connected to the second hinge link second end and a second end opposite the third hinge link first end pivotally connected to the crankpin link first end. 
 
     
     
         4 . The fluid flow machine of  claim 3 , wherein at least one chosen from the connecting rod and the first hinge link includes a third pivot connection, the pivot link second end pivotally connected to the third pivot connection. 
     
     
         5 . The fluid flow machine of  claim 4 , wherein the third pivot connection is positioned on a major thrust side of the at least one chosen from the connecting rod and the first hinge link and the pivot link first end is pivotally connected to the casing on the major thrust side of the at least one chosen from the connecting rod and the first hinge link. 
     
     
         6 . The fluid flow machine of  claim 5 , and further comprising at least one stop face positioned on at least one chosen from the connecting rod, the first hinge link, the second hinge link and the crankpin link limiting an amount of pivot of at least one chosen from the connecting rod, the first hinge link, the second hinge link and the crankpin link to another of the at least one chosen from the connecting rod, the first hinge link, the second hinge link and the crankpin link. 
     
     
         7 . The fluid flow machine of  claim 6 , wherein the at least one stop face provides a maximum pivot of approximately 90° between a longitudinal axis of the connecting rod and a longitudinal axis of the crankpin link. 
     
     
         8 . The fluid flow machine of  claim 7 , wherein the first hinge link includes the third pivot connection positioned intermediate the first hinge link first end and second end, the third pivot connection is positioned on a major thrust side of the first hinge link and the pivot link first end is pivotally connected to the casing on a major thrust side of the first hinge link; wherein each of the connecting rod, the first hinge link, the second hinge link and the crankpin link include at least one stop face for engaging an adjacent stop face to limit pivoting of the longitudinal axis of the connecting rod and the longitudinal axis of the crankpin link in at least one direction. 
     
     
         9 . The fluid flow machine of  claim 5 , wherein the third pivot connection includes a first gear portion and the pivot link second end includes a second gear portion engaging the first gear portion in a meshing connection that allows the first hinge link to pivot with respect to the pivot link as the connecting rod reciprocates. 
     
     
         10 . The fluid flow machine of  claim 9 , and further comprising a retention mechanism connected between the first hinge link and the pivot link to maintain the first gear portion in meshing engagement with the second gear portion throughout a range of pivoting of the multi-linkage connecting rod mechanism with respect to the pivot link. 
     
     
         11 . The fluid flow machine of  claim 10 , wherein one of the first gear portion and the second gear portion is a curved non-circular gear having a different radius in an x-axis than a y-axis and the other of the first gear portion and the second gear portion is a rack gear. 
     
     
         12 . The fluid flow machine of  claim 11 , wherein the retention mechanism includes at least one side plate having a first end and a second end, the at least one side plate fixedly attached on the first end to one of the multi-linkage connecting rod mechanism and the pivot link, the at least one side plate including a pair of spaced apart slots positioned on the second end, the other of the multi-linkage connecting rod mechanism and the pivot link including a pair of pins engaging the pair of spaced apart slots, respectively, to maintain the curved non-circular gear in meshing engagement with the rack gear throughout a range of pivoting of the multi-linkage connecting rod mechanism with respect to the pivot link. 
     
     
         13 . The fluid flow machine of  claim 12 , wherein the curved non-circular gear is positioned on the pivot link and the rack gear is positioned on the first hinge link; wherein the at least one side plate is fixedly attached on the first end to the first hinge link; wherein the pivot link includes the pair of pins. 
     
     
         14 . The fluid flow machine of  claim 5 , and further comprising:
 a moving pivot point mechanism connecting the pivot link first end to the casing, the moving pivot point mechanism including:
 a movable mount, the pivot link first end being connected to the movable mount; 
 a guide path device attached to the casing and having a guide path connecting to the movable mount and providing a defined path along which the movable mount can travel; 
   a motion control mechanism for controlling movement of the movable mount, the motion control mechanism including:
 a first cam mechanism driven by the crankshaft and having a first cam path; 
   a motion control linkage operatively connected between the first cam path and the movable mount to allow the first cam path to control movement of the movable mount, the first cam path being constructed and arranged to allow the movable mount to move along the guide path in a direction away from the multi-linkage connecting rod mechanism on a first portion of an upstroke of the piston and then to move the movable mount along the guide path in a direction toward the multi-linkage connecting rod mechanism on a second portion of an upstroke of the piston until reaching a locked position.   
     
     
         15 . The fluid flow machine of  claim 14 , wherein the motion control linkage further comprises:
 a first cam follower engaging the first cam path, the first cam follower including a driving surface;   a rocker arm pivotally mounted to the casing and having a first end connecting with the movable mount and a second end opposite the first end connecting with the first cam follower driving surface.   
     
     
         16 . The fluid flow machine of  claim 15 , and further comprising:
 a housing connected to the casing including:
 a first cam follower slot slidably receiving the first cam follower; 
   wherein the guide path device guide path includes a straight slot slidably receiving the movable mount;   wherein the movable mount is a sliding block including a pivot bore connecting to the pivot link;   wherein the first cam mechanism is positioned on the crankshaft, and the first cam follower slot is aligned radially with respect to an axis of the crankshaft.   
     
     
         17 . The fluid flow machine of  claim 5 , and further comprising:
 a moving pivot point mechanism connecting the pivot link first end to the casing, the moving pivot point mechanism including:
 a movable mount, the pivot link first end being connected to the movable mount; 
   a motion control mechanism for controlling movement of the movable mount, the motion control mechanism including:
 a first cam mechanism driven by the crankshaft and having a first cam path; 
   a motion control linkage operatively connected between the first cam path and the movable mount to allow the first cam path to control movement of the movable mount, the first cam path being constructed and arranged to allow the movable mount to move along a guide path in a direction away from the multi-linkage connecting rod mechanism on a first portion of an upstroke of the piston and then to move the movable mount along the guide path in a direction toward the multi-linkage connecting rod mechanism on a second portion of an upstroke of the piston until reaching a locked position; wherein the movable mount is pivotally connected to the casing to pivot about a movable mount axis and includes:
 a pivoting pivot link connection connected to the pivot link first end, the pivot link connection positioned radially outward of the movable mount axis such that pivoting of the movable mount about the movable mount axis causes the pivot link connection to move along an arcuate guide path; 
 a counterbalance portion opposite the movable mount axis from the pivoting link connection; 
   
       wherein the rocker arm first end engages at least one chosen from the movable mount and the pivot link. 
     
     
         18 . The fluid flow machine of  claim 17 , and further comprising:
 a locking mechanism for connecting with the movable mount for locking the movable mount in the locked position, the locking mechanism including:
 a locking pin being driven by the crankshaft to engage a portion of the movable mount when the movable mount is moved to the locked position to lock the movable mount in the locked position, the locking pin also being driven by the crankshaft to disengage the portion of the movable mount when the piston is on a downstroke of the piston; 
 a second cam mechanism driven by the crankshaft and having a second cam path; 
 a second cam follower engaging between the second cam path and the locking pin, the second cam follower including a driving surface; 
   wherein the locking pin includes a driven surface for engaging the second cam follower driving surface such that movement of the second cam follower in a locking direction causes the locking pin to move toward engagement with the movable mount and movement of the second cam follower away from the locking direction allows the locking pin to move away from engagement with the movable mount;
 the movable mount further including a locking surface for engaging the locking pin; 
   a housing including:
 a first cam follower slot slidably receiving the first cam follower; 
 a second cam follower slot slidably receiving the second cam follower; 
 a locking pin slot slidably receiving the locking pin; 
   wherein the first cam mechanism and the second cam mechanism are positioned on the crankshaft, the first and second cam follower slots are aligned radially with respect to an axis of the crankshaft and the locking pin slot is aligned normal to the second cam follower slot;   wherein the locking surface is positioned on an outer circumferential portion of the counterbalance portion and is formed as a notch in the outer circumferential portion of the counterbalance portion.   
     
     
         19 . The fluid flow machine of  claim 16 , wherein the third pivot connection includes a first gear portion and the pivot link second end includes a second gear portion engaging the first gear portion in a meshing connection that allows the first hinge link to pivot with respect to the pivot link as the connecting rod reciprocates. 
     
     
         20 . The fluid flow machine of  claim 19 , and further comprising a retention mechanism connected between the first hinge link and the pivot link to maintain the first gear portion in meshing engagement with the second gear portion throughout a range of pivoting of the multi-linkage connecting rod mechanism with respect to the pivot link. 
     
     
         21 .- 27 . (canceled)