Design method for propulsive force giving apparatus for tension device

Abstract

A thrust imparting device for a tensioner, wherein a pushing member having a screw thread is supported on a housing while the front end is engaged with a propelled component, and a rear portion of a rotary shaft having a threaded portion screwed to the screw thread and the housing is located between the rear portion of the rotating shaft and the housing , a bearing member supporting the rotary shaft while bearing the propulsion reaction force applied to the rotary shaft is installed, a spring is provided between the above-mentioned housing and the rotary shaft, and the endless transmission belt is pushed in the tensioning direction by the above-mentioned tensioner, Tension is provided to the endless transmission belt, and the pushing force as the protruding force of the pressing member generated by the pressing of the spring is overcome by the pressing force of the spring in a state where a certain load is applied to the pressing member. On a 2-dimensional diagram in which the return torque required to rotate the above-mentioned rotary shaft in which the push member retracts at a certain speed is a variable, the allowable limit of wear that can be tolerated by either or both of the above-mentioned tensioner and endless belt The above-mentioned thrust force and return torque are set within the range compatible with the allowable noise limit of the sound generated during the return of the above-mentioned endless belt.

Description

technical field [0001] The present invention relates to a design method of a propulsion imparting device for a tensioner such as a cam chain of an internal combustion engine that provides tension to an endless belt, and particularly relates to a feed screw type propulsion imparting device. Background technique [0002] In recent years, along with the need for high-quality internal combustion mechanisms, internal combustion mechanisms with low noise and vibration have begun to be demanded. On the other hand, due to the increase in speed of the internal combustion mechanism, it is also required to improve its durability. [0003] Generally, in order to improve the durability of the cam chain, it is possible to reduce the tension of the cam chain generated by the tensioner, but since the tension of the cam chain is low, there will be a problem of increasing the tendency of the cam chain to return sound. Therefore, there is a need for a device capable of improving both wear res...

AI Technical Summary

Problems solved by technology

[0008] However, in order to significantly reduce the noise level of the cam chain, it is necessary to increase the thrust of the thrust giving device of the tensioner. In this way, when the tension of the cam chain is increased, the push-back force originating from the pushing force giving device is significantly increased, facilitating In order to reduce the wear of the cam chain and tensioner, the tension of the cam chain becomes smaller in a short time, which damages the silence

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