Slope plate type hydraulic action device and static pressure stepless speed variator

Abstract

Distributing valves of a swash plate type hydraulic drive transmission can make a cylinder block smaller and reduce the number of processes and the number of parts. <??>Distributing valves 63A alternately switch, corresponding to the axial reciprocating motion of plungers 17, communication and cutoff between communication passages 65A communicated to oil chambers 61 opening to the inner surface of cylinder holes 16 and low pressure ports 66A and high pressure ports 67A communicated to a low pressure oil passage 11A and a high pressure oil passage 12A opening to the inner surface of the cylinder holes 16. <IMAGE>

Description

technical field [0001] The present invention relates to a swash plate type hydraulic operating device and a static pressure continuously variable transmission, in particular to an improvement of a swash plate type hydraulic operating device with the following distribution valve and a static pressure continuously variable transmission, that is, in the column When the plug moves to the side of the enlarged oil chamber, the oil chamber communicates with the low-pressure oil circuit, and at the same time, when the plunger moves to the side of the reduced oil chamber, the above-mentioned oil chamber communicates with the high-pressure oil circuit. Background technique [0002] Such a swash plate type hydraulic actuator and a static pressure continuously variable transmission are disclosed in, for example, Japanese Patent Application Laid-Open No. 11-82288, etc., in which a plurality of pump plungers are parallel to and slidably fitted in a cylinder body. The plurality of first di...

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned conventional machines, in addition to a plurality of pump cylinder holes and motor cylinder holes, a plurality of sliding holes for slidably fitting a plurality of first and second distributing valves are also provided on the cylinder body, In order to configure these sliding holes and ensure their space, the diameter of the cylinder body cannot be too large, and since each sliding hole needs to be drilled, the number of processing steps cannot be increased.

Moreover, the first and second distribution valves must have the first and second valve swash plates for driving these distribution valves, thereby increasing the number of components.

Images