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:
Jul. 16, 1991
Filed:
Apr. 03, 1990
Masahiro Fukuta, Nagoya, JP;
Osamu Komazawa, Nagoya, JP;
Tsukasa Watanabe, Toyota, JP;
Hiroyuki Ikemoto, Susono, JP;
Toshio Onuma, Susono, JP;
Shinji Matsuda, Toyota, JP;
Kunihito Sato, Susono, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A pressure control valve delivers a pressure which is proportional to a current level chosen to energize a solenoid therein to a shock absorber of a suspension. A spool in the valve has an annular groove for communicating an output port to a high pressure port or a low pressure port selectively. There are conical surfaces or inclined surfaces at edges of lands adjacent to the groove, which incline from annular surfaces of the lands toward the bottom of the groove. The inclined surfaces slow down a change of the flow rate from the high pressure port to the output port and from the output port to the low pressure port when the annular groove communicates with the high pressure port and the low pressure port respectively.