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:
Nov. 11, 2003
Filed:
Mar. 06, 2002
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A speed change control valve ( ) houses a spool ( ) of comprising a land ( ) which can face a supply port ( P) supplying an oil pressure, and lands ( ) which can respectively face a pair of drain ports ( D, D) formed on either side of the supply port ( P). Output ports ( L, H) which allow a first and second oil chamber of an hydraulic cylinder to communicate selectively with the supply port ( P) or the drain ports ( D) according to the displacement of a spool ( ), are provided in the speed change control valve ( ). In the neutral position of the spool ( ), the lands ( ) respectively face the drain ports ( D), a width L of the land ( ) is set to be equal to or greater than a width L of the supply port ( P), and a width L of the lands ( ) is set to a width at which the drain port ( D) can open.