Low-friction bush-free connecting rod-piston pin structure

Abstract

The invention relates to a low-friction bush-free connecting rod-piston pin structure, in particular to a structure formed by matching a connecting rod of which a bush is omitted with a piston pin of which the surface is coated with a diamond-like coating material, namely DLC, and belongs to the technical field of connecting rod pistons. The structure comprises a connecting rod, a piston pin and a piston. The surface of the piston pin is coated with the diamond-like coating. A connecting rod small head hole comprises a middle hole section and side hole sections symmetrically formed in the left and right sides of the middle hole section. The generatrix of the middle hole section is axially straight. Each side hole section is a horn-shaped hole with the diameter is gradually increased from the side close to the middle hole section to the other side. The cross section of the connecting rod small head hole is in an oval shape. The diamond-like coating on the surface of the piston pin has high hardness, good abrasion resistance and self-lubricating property, low friction coefficient and good adhesive resistance, and completely adapts to the oil-less lubricating state of the connecting rod small head hole.

Description

technical field [0001] The invention relates to a low-friction bushless connecting rod piston pin structure, in particular to a structure composed of a piston pin whose mating surface of a connecting rod without a bushing is coated with a diamond-like coating material DLC, which belongs to a connecting rod piston technical field. Background technique [0002] In a piston engine, the function of the connecting rod is to connect the crankshaft and the piston in the engine, convert the reciprocating motion of the piston into the rotational motion of the crankshaft, and transmit the gas pressure on the piston to the crankshaft, which outputs mechanical energy to do work. The connecting rod includes three parts: the small end of the connecting rod, the rod body and the big end of the connecting rod. There are two piston pin holes on the piston. The small end of the connecting rod is connected to the piston through the piston pin, and the piston pin passes through the piston pin h...

AI Technical Summary

Problems solved by technology

This kind of design is that the influence of heat on the small head hole of the connecting rod during the thermal spraying process cannot be controlled, which can easily lead to a decrease in the strength of the small head hole of the connecting rod, and at the same time cause deformation of the connecting rod hole. After thermal spraying, it needs to be reprocessed. Compared with the bush connecting rod, there is not much technological progress, and there is no advantage in production cost

[0006] To sum up, although people continue to introduce new technical measures in terms of reducing weight, reducing cost, improving reliability and mass production when designing the matching pair of connecting rod small end hole and piston pin, but in the There are various deficiencies in the technology, and it is impossible to give full play to its advantages in mass production applications.

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