US Patent 7608004 Deairing type hydraulic tensioner

Patent 7608004 was granted and assigned to Tsubakimoto Chain on October, 2009 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Tsubakimoto Chain

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

76080040

Patent Inventor Names

Osamu Yoshida0

Hiroshi Hashimoto0

Date of Patent

October 27, 2009

Patent Application Number

112458150

Date Filed

October 7, 2005

Patent Primary Examiner

‌

Bradley T King

Patent abstract

In a hydraulic tensioner, a deairing valve unit, for releasing air mixed with oil in the high pressure oil chamber of the tensioner, comprises a check ball, a retainer, which envelops the check ball, but allows the check ball to move freely between an inflow end and an outflow end of a retainer passage, and a cylindrical ball seat press-fit into to a recess formed in a front end of the retainer. The deairing valve unit communicates with an exhaust vent formed in the front end of the plunger. A ball biasing spring is optionally provided to bias the check ball toward the ball seat.