Reduced piston-pressure hydraulic chain adjuster

Abstract

A hydraulic chain adjuster wherein a high-pressure chamber (3), which receives chain adjuster piston (4) that is mounted counter to a spring, is connected to an oil supply chamber (2) of the adjuster, which is connected to the oil gallery of the motor. An over-pressure valve (8) is incorporated into the oil supply to the chain adjuster, particularly inside the wall of the oil supply chamber (2). The opening pressure of said valve is adapted to the desired supply pressure of the adjuster.

Description

technical field

[0001] The invention relates to a hydraulic chain tensioner, the high-pressure chamber containing the piston of the chain tensioner supported by the reverse spring is connected with the oil supply chamber of the tensioner, and the oil supply chamber is connected with the oil circuit of the engine. Background technique

[0002] The sometimes high oil supply pressure supplied by the chain tensioner, especially with a cold engine or high rpm, affects the chain tensioner piston and leads to an increased pretension of the chain tensioner piston and thus to an average higher chain force. This not only increases the friction on the transmission and adversely affects the noise conditions, but also worsens the wear conditions.

[0003] With the increase of chain patterns, these existing problems are more prominent. Among them, it is particularly worthy of attention that the additional length of the chain will be increased.

[0004] Although it has been proposed to l...

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