The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 2009
Filed:
May. 18, 2006
Shigenori Sakikawa, Hyogo, JP;
Shigenori Sakikawa, Hyogo, JP;
Kanzaki Kokyukoki Mfg. Co., Ltd., Hyogo, JP;
Abstract
There is provided a neutral valve structure applied to at least one of a pair of operation fluid lines in an HST, including: a valve body slidable 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; and a biasing member for urging the valve body toward the releasing position on one side of the axis line direction. The valve body includes: a closing-side pressure-receiving portion for receiving the hydraulic pressure of the corresponding operation fluid line so as to press the valve body toward the closing position on the other side of the axis line direction against the urging force of the biasing member; and a releasing-side pressure-receiving portion for receiving the hydraulic pressure of the corresponding operation fluid line so as to press the valve body toward the releasing position on one side of the axis line direction along with the biasing member. The closing-side pressure-receiving portion has a receiving pressure area larger than that of the releasing-side pressure-receiving portion.