Auxiliary oil inlet structure of piston pin bearing

Abstract

The invention provides an auxiliary oil inlet structure of a piston pin bearing. A connecting rod hole is in revolute pair connection with a first piston pin seat hole and a second piston pin seat hole in a piston through a piston pin; a gap is formed between a small connecting rod head and a piston pin seat; a first spiral groove and a second spiral groove are formed in the outer wall of the piston pin at the same position as the gap; and a connecting rod bushing is mounted in the small connecting rod head hole. According to the auxiliary oil inlet structure of the piston pin bearing, the first spiral groove and the second spiral groove are formed in the piston pin to assist the connecting rod hole, the first piston pin seat hole and the second piston pin seat hole in oil inlet, so that sufficient lubricating oil quantity of the bearing is guaranteed, temperature rise of the piston pin bearing due to insufficient lubricating and cooling is reduced, and meanwhile, abrasion of the piston pin bearing is reduced.

Description

technical field [0001] The invention belongs to the technical field of piston pin bearings, and in particular relates to an auxiliary oil inlet structure of a piston pin bearing. Background technique [0002] High-strength diesel engine piston pin bearings have a harsh working environment, which bear high specific pressure, low relative speed, and difficult oil film formation. Due to the limitation of high compact structure, the bearings mostly use cooling nozzles to realize splash lubrication and impact cooling of the small end of the connecting rod. The floating piston pin in the bearing reciprocates along the cylinder axis under the action of combustion pressure and inertial force to form a pumping effect in the bearing hole, sucking the oil accumulated at the end of the connecting rod bushing into the bearing to realize oil exchange and lubrication, but the bearing In actual work, the oil stock at both ends of the connecting rod bushing is very random, and a stable oil a...

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Problems solved by technology

[0002] High-strength diesel engine piston pin bearings have a harsh working environment, which bear high specific pressure, low relative speed, and difficult oil film formation. Due to the limitation of high compact structure, the bearings mostly use cooling nozzles to realize splash lubrication and impact cooling of the small end of the connecting rod. The floating piston pin in the bearing reciprocates along the cylinder axis under the action of combustion pressure and inertial force to form a pumping effect in the bearing hole, sucking the oil accumulated at the end of the connecting rod bushing into the bearing to realize oil exchange and lubrication, but the bearing In actual work, the oil stock at both ends of the connecting rod bushing is very random, and a stable oil amount cannot be guaranteed

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