Jtekt Corporation

Bosch Automotive Systems Corporation

Toyoda Machine Works, Ltd.

Yozo Yamashita

Shinichiro Nakajima

Makoto Nishiji

Junji Ando

Naoyuki Sakai

Hideyuki Saito

A plurality of microscopic grooves are created on the surface of the teeth of planetary gears, and thus, irregular unevenness is created. This irregular unevenness includes a plurality of first microscopic grooves which function as lubricant grooves and a plurality of second microscopic grooves which are shallower than the first microscopic grooves.

Limited slip differential and manufacturing method for limited slip differential

Five receiving holesextending along the axis of a circular cylindrical portionof a housing are formed in the circular cylindrical portion. Those five receiving holesare arranged at equal intervals in the peripheral direction of the circular cylindrical portion. Each receiving holerotatably receives therein a planetary gear. The respective planetary gearsare in engagement with an inner gearand a sun gear. The teeth of the inner gear, the sun gearand the planetary gearsare helical teeth. The numbers of teeth of the inner gear, the sun gearand the planetary gearsare set to 36, 24 and 6, respectively. As a result, the numbers of teeth of the inner gearand the sun gearlocated between adjacent two planetary gearsin the peripheral direction become 7.2 and 4.8, respectively, which are values each having a fraction below the decimal point.

Planetary gear apparatus

A carrieris fixed to one end opening part of a circular cylindrical apparatus main body. A plurality of receiving holes, which extend in parallel with a rotation axis L, are formed in the carrierat the same interval in a peripheral direction. A planetary gearis received in each receiving holesuch that the planetary gearcan rotate on its own axis. An inner gearand a sun gear, which are arranged with their axes aligned with the rotation axis L of the apparatus main body, are disposed within the apparatus main body. The inner gearis engaged with the planetary gearsat the outside thereof. The sun gearis engaged with the planetary gearsat the inner side thereof. An engagement part between the inner gearand the planetary gearand an engagement part between the sun gearand the planetary gearare displaced from each other in a direction of the rotation axis L so that they are not overlapped with each other in a direction of the rotation axis L.

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Higashimatsuyama, Japan

Yozo Yamashita