Importance

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Abstract

A hydraulic master and slave cylinder assembly of the type in which a piston is positioned in the master cylinder, a piston rod is connected to the piston and extends out of the input end of the master cylinder, a piston is positioned in the slave cylinder, a piston rod is connected to the slave cylinder piston and extends out of the output end of the slave cylinder, a first conduit extends between the output end of the master cylinder and the input end of the slave cylinder, and a second conduit extends between the input end of the master cylinder and the output end of the slave cylinder. The length of the conduit interconnecting the input end of the master cylinder and the output end of the slave cylinder is greater than the length of the other conduit by an amount compensating for the difference in the full bore volumes of cylinders and the piston rod or annular bore volumes of the cylinders so that the total volume defined on the full bore sides of the cylinders, including the interconnecting conduit, is substantially equal to the total volume defined on the annular sides of the cylinders, including the interconnecting conduit, with the result that creep occurring in the system as a result of extreme temperature variations within the system is substantially eliminated so that the assembly may be used as a remote shift mechanism for a motor vehicle automatic transmission without fear of inadvertently shifting the transmission due to creep occurring in the system in extreme temperature situations.

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First Claim