AUTOMATIC TRANSMISSION HAVING PRESSURE REGULATOR FOR PERFORMING COMPENSATION OF FLOWING FORCE

摘要

PROBLEM TO BE SOLVED: To provide an automatic transmission having a pressure regulator for compensating or correcting flowing force for providing a stable line pressure.

SOLUTION: The automatic transmission 10 has the pressure regulator 100 for compensating the flowing force. The pressure regulator 100 includes a valve body 110 having a valve hole 112, at least one entrance port 120 fluid-communicating with a pressurized liquid pressure fluid source and returning to a pressure source and at least one exit port 124. The valve member 130 is slidably arranged in the valve body 110 and includes at least one valve element 136 having an outer periphery 186 and a regulation surface 188. The regulation surface 188 controls a flow of a liquid pressure fluid between the entrance port 120 and the exit port 124. The regulation surface 188 includes a flowing force compensation annular clearance 190 arranged adjacent to the outer periphery 186. The annular clearance 190 is defined by a lead angleαmeasured between the outer periphery 186 and a linear line crossing the outer periphery 186 and contacted with the annular clearance 190.

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