Hydraulic Tensioner

Patent No. 7,691,017

Issued: April 6, 2010
Filed: March 18, 2005
Foreign Priority: April 23, 2004 (Japan 2004-128026)

Inventors: Seungpyo; Shin (Kyunggi-do, KR), Barrette; Simon (Nabari, JP)
Assignee: BorgWarner Morse TEC Japan K.K. (Nabari, JP)

A hydraulic tensioner comprising a piston slidably inserted in a piston bore of a housing having rack teeth on an outer circumference thereof, a piston spring biasing the piston in a protruding direction, a pawl member having teeth engageable with the rack teeth of the piston to permit protruding movement of the piston but to block reverse movement of the piston provided in a pawl hole of the housing, and a pawl spring in a pawl spring hole of a generally elliptical cross-section that biases the pawl member in an engaging direction of the teeth of the pawl member with the rack teeth of the piston. A long axis of the generally elliptical cross-sectional shape of the pawl spring is oriented toward an axial direction of the piston. Wire portions of the pawl spring substantially follow the long axis that contacts an upper surface of the pawl member.

Reference to Related Applications

This is a continuation-in-part of copending application Ser. No. 10/922,207, filed Aug. 19, 2004, entitled "HYDRAULIC TENSIONER", which claimed an invention which was disclosed in Japanese Application No. 2003-311278, filed Sep. 3, 2003, entitled "Hydraulic Tensioner." The application also claims priority from Japanese Application No. 2004-128026, filed Apr. 23, 2004, entitled "Hydraulic Tensioner." The aforementioned applications are hereby incorporated herein by reference.

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