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US 5,850,777 AGranted
Floating wrist pin coupling for a piston assembly
AssigneeColtec Industries Inc.
InventorsMark W. Marklin, Glen D. Prince
Life of this patent
Estimating the term…
Abstract
The floating wrist pin coupling for a piston assembly will rotate within a bearing assembly for an oscillating connecting rod as a piston cycles through compression and suction strokes. As the wrist pin rotates through 360 degrees, the bearings within the bearing assembly are lubricated and subjected to a rotary rather than an oscillating motion as the connecting rod oscillates.
Claims13
A piston assembly for a non-lubricated reciprocating machine comprising:
- a piston having two opposed wrist pin receiving bosses, each of said bosses including a transverse bore extending laterally through said piston;
- a connecting rod having a pin end receivable in said piston with said pin end positioned between said two wrist pin receiving bosses, said pin end including a transverse opening positioned in axial alignment with said transverse bores;
- a cylindrical wrist pin mounted within said piston with a first end of said wrist pin positioned within one of said transverse bores and a second end of said wrist pin positioned within the other of said transverse bores;
- said wrist pin extending through said transverse opening in the pin end of said connecting rod and being mounted for rotation within said transverse opening in the pin end of said connecting rod and said transverse bores in the wrist pin receiving bosses;
- a bearing assembly secured within said transverse opening in the pin end of said connecting rod, said bearing assembly being positioned between said cylindrical wrist pin and said connecting rod;
- said bearing assembly including a plurality of rotatable needle bearings;
- wherein said needle bearings are sealed in a lubricant to provide lubrication to the bearing assembly.
4 more elements
A piston assembly for a non-lubricated reciprocating machine comprising:
- a piston having two opposed wrist pin receiving bosses, each of said bosses including a converse bore extending laterally through said piston;
- a connecting rod having a pin end receivable in said piston with said pin end positioned between said two wrist pin receiving bosses, said pin end including a transverse opening positioned in axial alignment with said transverse bores;
- a cylindrical wrist pin mounted within said piston with a first end of said wrist pin positioned within one of said transverse bores and a second end of said wrist pin positioned within the other of said transverse bores;
- said wrist pin extending through said transverse opening in the pin end of said connecting rod and being mounted for rotation within said transverse opening in the pin end of said connecting rod and said transverse bores in the wrist pin receiving bosses;
- a bearing assembly secured within said transverse opening in the pin end of said connecting rod, said bearing assembly being positioned between said cylindrical wrist pin and said connecting rod;
- and
- rider rings wrapped around said piston for restricting the lateral movement of said wrist pin.
4 more elements
A piston assembly for a non-lubricated reciprocating machine comprising:
- a piston cylinder;
- a piston having two aligned, spaced, transverse bores extending laterally through said piston;
- said piston being mounted for reciprocal movement in said piston cylinder in a cycle including a suction stroke and a compression stroke;
- a connecting rod having a pin end receivable in said piston between said two transverse bores in said piston;
- said pin end including a transverse opening posititioned in axial alignment with said two transverse bores;
- a cylindrical wrist pin mounted within said piston having a first end positioned within one said two transverse bores and a second end positioned within the other of said two transverse bores;
- said wrist pin being mounted for rotation within both said transverse opening in the pin end of said connecting rod and said two transverse bores in said piston and rotating when said piston is in the suction stroke but being locked against rotation by friction when said piston is in the compression stroke;
- cylindrical bushings secured within said transverse bores in said piston, said cylindrical bushings being positioned between said cylindrical wrist pin and said piston so that said cylindrical wrist pin is rotable within said cylindrical bushings;
- wherein said cylindrical bushings are formed from a self-lubricating material which insulates said wrist from heat;
- and
- a needle bearing assembly secured within said transverse opening in the pin end of said connecting rod, said needle bearing assembly being positioned between said cylindrical wrist pin and said connecting rod so that said cylindrical wrist pin is rotable within said needle bearing assembly;
- a bearing assembly secured within said transverse opening in the pin end of said connecting rod, said bearing positioned between said cylindrical wrist pin and said connecting rod;
- said bearing assembly includes a plurality of bearings sealed in a lubricant, the rotation of said wrist pin operating to distribute said lubricant within said bearing assembly.
10 more elements
Dependencies are inferred from the claim text.