Diesel engine roller tappet

Abstract

The invention discloses a diesel engine roller tappet. The diesel engine roller tappet comprises a machine body and a bush, wherein a tappet body is arranged in the machine body; a thrust block is arranged on the tappet body; the upper end of the thrust block abuts against a push rod; the thrust block is in interference fit with the tappet body; a roller is arranged on the outer side face of the bush; a rotating mechanism composed of the roller and the bush is fixedly connected with the tappet body through a positioning shaft; and one side of the positioning shaft is fixedly connected with thetappet body through a positioning screw. Vertical through holes are adopted in a first oil way and a second oil way of the diesel engine roller tappet, machining is simple, and the production cost issaved; a rectangular positioning boss at one end of the positioning shaft effectively prevents the tappet body from rotating in the working process, positioning is simple, and use is reliable; and the positioning shaft is positioned on the tappet body through the positioning screw, positioning is accurate and reliable, and the assembling accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a diesel engine roller tappet. Background technique [0002] Diesel engine valve train mainly includes tappet, push rod and rocker arm. During the working process of the diesel engine, the function of the tappet is to transmit the motion of the cam from the camshaft to the push rod, and then realize the opening and closing of the intake and exhaust valves to ensure the timing of the diesel engine. [0003] A roller type tappet (201220045223.6) includes a tappet body, the tappet body is provided with a tappet inner cavity, and the bottom end is provided with a roller groove, the roller groove is installed with a roller through a pin shaft, and a limiter for limiting the axial displacement of the roller The bit block and the inner chamber of the tappet are provided with side through holes and oblique oil holes for lubricating the surface of the roller and the t...

AI Technical Summary

Problems solved by technology

In this solution, the side through hole and the inclined oil hole are processed in the inner cavity of the tappet, which is difficult to process and increases the production cost, and this setting can only lubricate the contact surface between the roller and the cam, and cannot guarantee the lubrication between the roller and the pin shaft, which is prone to dry friction Causes the roller to be stuck; the push rod is in direct contact with the inner surface of the tappet, which can easily cause the surface of the roller tappet to wear out, with many parts and complicated installation, making it unreliable to use

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