Patent ID: 7523610
Filing Date: 2009-04-28
Classification: F16D

Abstract:
1. A neutral valve structure applied to at least one of a pair of operation fluid lines in an HST, comprising: (a) a port block formed with first and second operation passages that form at least parts of the pair of operation fluid lines and an installation passage; (b) a valve body inserted in the installation passage in a slidable manner in the axis line direction so as to take a closing position where the corresponding operation fluid line is liquid-tightly closed and a releasing position where the corresponding operation fluid line is released to a low-pressure area; (c) a biasing member inserted in the installation passage for urging the valve body toward the releasing position on one side of the axis line direction; (d) a lid member attached to the port block so as to close an opening end of the installation passage to engage a base end of the biasing member and define a spring chamber for accommodating the biasing member between the valve body and the lid member; and (e) the valve body including: (f) the lid member being threaded into the opening end of the installation passage so as to be position-adjustable with respect to the axis line direction of the valve body.