Engine accessory belt hydraulic tensioner

Abstract

The invention provides an engine accessory belt hydraulic tensioner. The engine accessory belt hydraulic tensioner comprises a plunger and a shell, wherein hydraulic oil is injected into the inner cavity of the shell; a barrel for generating hydraulic damping is arranged in the inner cavity of the shell; the top open end of the shell is hermetically connected with a plunger sleeve of the plunger; an oil pressure damping gap is formed between a plunger rod of the plunger and the inner cavity of the barrel; springs are arranged between the plunger sleeve and the barrel; a one-way valve for preventing the hydraulic oil in the inner cavity of the barrel from flowing reversely is arranged at the bottom of the barrel. The engine accessory belt hydraulic tensioner is applied to an engine accessory belt transmission system, so that the vibration noise of a belt can be effectively lowered, belt wear caused by vibration can be reduced to the maximum extent, the accuracy and reliability of belt transmission are ensured, the service life of the system is prolonged, and the reliability of long-term working is ensured; moreover, the hydraulic oil in the inner cavity of the hydraulic tensioner can be used for effectively lubricating moving components, and heat generated during movement is dissipated in time, so that the service life of the hydraulic tensioner is prolonged.

Description

technical field [0001] The invention relates to the technical field of an engine accessory belt tensioner, in particular to a hydraulic tensioner for an engine accessory belt. Background technique [0002] The engine accessory belt tensioner is widely used in the accessory belt drive system of the new internal combustion engine. It absorbs the vibration in the belt drive through the internal torsion spring and the friction plate to reduce the impact on the components in the drive system and extend the accessory belt drive. The service life of the system ensures the accuracy and reliability of the belt drive, reduces the transmission noise, and improves the driving comfort. [0003] But the existing engine accessory belt tensioner mainly has the following two problems: [0004] First, the existing engine accessory belt tensioners generally use torsion springs and friction plates to tension the belt and provide damping force. Since the tensioner needs to meet the normal opera...

AI Technical Summary

Problems solved by technology

[0004] First, the existing engine accessory belt tensioners generally use torsion springs and friction plates to tension the belt and provide damping force. Since the tensioner needs to meet the normal operation of the engine under complex working conditions, the tension of the belt often The design is larger so as to maximize the tension of the belt and prevent the belt from slipping so that the generators, water pumps, air-conditioning compressors and other equipment in the system cannot work normally.

However, the tension of the belt is too large, so that the belt is in a state of tension for a long time during work. The continuous increase of the tension of the belt makes the belt more likely to be stretched, and also causes the bearing pressure of the moving mechanism of each component in the system. increase, making the wear of the bearing intensified

Therefore, the service life of belts, bearings, etc. is greatly limited

[0005] Second, because the damping energy of the existing engine accessory belt tensioner is produced by the friction of the friction plate, long-term use will cause the friction plate to heat up, increase the friction, and reduce the damping capacity. When working, it is easy to cause the vibration of the belt to intensify, but the tensioner cannot provide corresponding damping to buffer the severe vibration. Therefore, the belt produces strong noise due to excessive amplitude, which affects driving comfort and is not conducive to accessories. stable operation of the system

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