| 摘要 |
<p>PURPOSE:To suppress transfer of the pump pressure variation by installing an elastic oil guide inside a port to which the pump discharge pressure is introduced, wherein the oil guide is to adjust the capacity of inside said port. CONSTITUTION:An oil guide 20 for reducing surging sound is installed inside a port 2c, into which the line pressure of the pump discharge pressure is introduced at all times. The guide body 21 of oil guide 20 made of elastic substance such as resin has the same shape as said port 2c, and a hole 22 of the same dimension as a land 3b will open. Thin oil passages 23, 24 are formed on the right and left of the guide body 21, and inlets to the two oil passages 23, 24 are in communication with each other through a notch 25. Thereby transfer of pressure variation at the oil pump 8 is restricted by these thin oil passages 23, 24, and no transfere will be made to a spool 3.</p> |
