Ntn Toyo Bearing Co., Ltd.

Ntn Corporation

Tomoyoshi Egusa

Kazuki Kawashima

Yutaka Miki

Masayuki Kuroda

Motoharu Niki

Koshiro Fujimoto

Yutaka Yamauchi

A hydraulic autotensioner is arranged so as to include a cylindrical body having a closed end, a plunger slidably mounted in the body and formed with a hole in a top surface thereof, and a rod having a bottom end which is inserted in the hole. The plunger partitions the interior of the cylindrical body into a pressure chamber and a reservoir chamber. The pressure chamber communicates with the reservoir chamber through a return passage. A pressure control spring biases the rod and the plunger in a direction out of the cylindrical body. The return passage is defined by an axial through hole extending through the bottom surface of the plunger. A groove is formed in the inner peripheral surface of the plunger or in a surface of a bottom portion of the rod.

Hydraulic autotensioner

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Growing community of inventors

Iwata, Japan

Tomoyoshi Egusa