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:
Feb. 07, 2012
Filed:
Mar. 26, 2007
Takeharu Matsuzaki, Kariya, JP;
Shigeto Nakajima, Nagano, JP;
Takeshi Kobayashi, Nagano, JP;
Kabushiki Kaisha Toyota Jidoshokki, Aichi-ken, JP;
Nishina Industrial Co., Ltd, Nagano-Ken, JP;
Abstract
A hydraulic control apparatusincludes a switch valve, a valve support chamber, a flow control valvemovable within the valve support chamber, an on-off valvemovable within the communication path chamber, and a valve control device. The flow control valvehas a communication path chamberand a back pressure chamber. The on-off valveis capable of opening and shutting off a communication path X between a cylinder lineand a switch valve line. A restrictor is formed between the flow control valveand a wall defining the valve support chamber. The restrictor connects the cylinder lineand the communication path chamberto each other. The opening degree of the restrictor is changed in correspondence with movement of the flow control valve. When the switch valveis located at the neutral position or the supply position, the valve control deviceapplies a fluid pressure in the cylinder lineto the back pressure chamberfor urging the on-off valvein a direction for shutting off the communication path. When the switch valveis located at the drainage position, the valve control deviceapplies a pilot pressure lower than the fluid pressure in the cylinder lineto the back pressure chamber, thereby moving the on-off valvein a direction for opening the communication path X.