Auxiliary gear for internal combustion engine

Abstract

A resin-made auxiliary gear for an internal combustion engine with which the desired backlash with a motive power transmission gear made from a metal material that the auxiliary gear meshes with is achieved even after the auxiliary gear has been immersed in lubricating oil containing a blow-by gas or dew condensation water, gear cost can be reduced, durability can be improved, and meshing sound can be reduced. An auxiliary gear 82 for an internal combustion engine meshes with a motive power transmission gear 47 that transmits driving force of a crankshaft 31 to auxiliary machinery 8 of an internal combustion engine 3, wherein the motive power transmission gear is made from an iron-based metal material and is provided so as to rotate integrally with the crankshaft, the auxiliary gear for an internal combustion engine is a resin-made gear made by injection molding into a single composition of a heat-resistant resin not containing reinforcing materials such as fibers, the auxiliary gear is provided to a rotating shaft 88 rotatably supported inside a crank case 35 that supports the crankshaft, and the gear shape of the auxiliary gear for an internal combustion engine in a completely dry state before initial use is set so that the backlash with the motive power transmission gear is greater than a prescribed minimum state when the auxiliary gear for an internal combustion engine is in a maximum swollen state of having absorbed moisture.

Description

technical field [0001] The present invention relates to a resin-made auxiliary gear for an internal combustion engine that does not contain reinforcing materials such as fibers. Background technique [0002] As methods for reducing dimensional changes and improving strength of resin gears, as shown in the following Patent Documents 1 and 2, there have conventionally been metal inserts, resin composite (two-layer) structures, and structures containing reinforcing materials such as fibers. , but there are issues such as cost and durability. For auxiliary gears for internal combustion engines made of resin, it is required to reduce costs while improving productivity, and to obtain the same durability as the past, and a light-weight and inexpensive structure. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Unexamined Patent Publication No. 2007-132483 ( Figure 1 ~ Figure 3 ) [0006] Patent Document 2: Japanese Patent No. 6254853 ...

AI Technical Summary

Problems solved by technology

[0002] As methods for reducing dimensional changes and improving strength of resin gears, as shown in the following Patent Documents 1 and 2, there have conventionally been metal inserts, resin composite (two-layer) structures, and structures containing reinforcing materials such as fibers. , but there are issues such as cost and durability. For auxiliary gears for internal combustion engines made of resin, it is required to reduce costs while improving productivity, and to obtain the same durability as the past, and a lightweight and inexpensive structure.

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