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, 2020
Filed:
Nov. 16, 2016
Hitachi Automotive Systems, Ltd., Ibaraki, JP;
Osamu Yuno, Yokohama, JP;
Yasuhiro Aoki, Yokohama, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Ibaraki, JP;
Abstract
A damping force control type shock absorber capable of achieving both air bleeding performance and damping force responsiveness at reduced cost. When a pilot valve () is closed during the extension stroke of a piston rod (), a cylinder upper chamber (A) is communicated with a back-pressure chamber () through a passage () including an orifice (), a communicating passage (), a pilot chamber (), and a communicating passage (). At this time, the cylinder upper chamber (A) is not communicated with a cylinder lower chamber (B); therefore, damping force responsiveness is ensured. Further, because there is no need to provide a check valve in the passage, it is possible to suppress an increase in manufacturing cost. Further, air entering the pilot chamber () moves upward through the communicating passage (). Therefore, the air can be discharged into the cylinder upper chamber (A) through the passage ().