Other

Aisin Aw Co., Ltd.

Katsuhiro Maeno

Toshiki Kanada

Atsushi Mori

Osamu Takeuchi

Yoshinori Shibayama

Akira Matsuo

Naoki Takabayashi

Kazutoshio Nozaki

Kiyoshi Tajima

A ring gear that, together with a sun gear and a pinion gear that is disposed radially outward of the sun gear and meshes with the sun gear, forms a planetary gear unit, the ring gear includes: a body, internal teeth that are configured to mesh with the pinion gear and that are formed in at least a part of an inner peripheral surface of the body, and external teeth that have a lower hardness than the internal teeth and that are formed in at least a part of an outer peripheral surface of the body, wherein a surface nitrogen concentration in the internal teeth is higher than that in at least tooth surfaces of the external teeth.

Ring gear and method for manufacturing ring gear

An oil film is formed between side faces of a pump gear and side faces of a pump casing to thereby reduce wear and reduce sliding resistance. To form the oil film predetermined numbers of recesses are provided in both side faces of a drive gear and in both side faces of a driven gear of the gear pump. The recesses serve to hold oil. The oil held in the recesses oozes out to between the opposing and contacting side faces to thereby form the oil films therebetween.

Gear pump for automatic transmission

Growing community of inventors

Anjo, Japan

Katsuhiro Maeno