Nsk Corporation

Daisaku Kawada

Koji Hashimoto

Mikio Yamaguchi

Tomofumi Yamashita

Akio Sakai

Shinobu Mogi

Toru Harada

Ryohei Yamauchi

Naoya Aoki

Shingo Saito

Goro Hirose

Manabu Horikoshi

Masahito Sato

Atsushi Hirabayashi

Since centers of a second gear, a fourth gear and a sixth gear coincide with each other and are disposed rotatably round a circumference of the same long shaft, a compact configuration can be realized while using a gear train of five gears to obtain a reduction gear ratio of a high gear ratio. The configuration in which the three gears have the same rotational center shaft in the way described above in an actuator which incorporates a plurality of gears is advantageous in that the number of center shafts is reduced and that the number of supporting holes in a housing which support center shafts is reduced.

Actuator

An electric driving device for a transmission can be reduced in size with a simple structure, and can be installed in a small-sized car, such as a passenger car. In this electric driving device, a shift shaft effects a selecting operation by its displacement in the axial direction and a shifting operation by its rotation. The displacement of the shift shaft in the axial direction is effected by rocking and displacing a rocking arm by means of a first actuator or . Rotation of the shift shaft is effected by pushing and/or pulling a rocking arm by means of a second actuator . This driving arm is fixedly disposed on the outer peripheral surface of a spline tube which is brought into spline-engagement with the shift shaft

Electric drive device for transmission

An electric linear actuator includes an output shaft which is non-rotatable but displaceable in an axial direction and which has one end thereof coupled to a driven device; a cylindrical member arranged coaxially with the output shaft and rotatably about the output shaft, and driven by an electric motor for rotation; and a feed screw mechanism arranged between the output shaft and the cylindrical member for converting a rotating motion of the cylindrical member to a linear motion of the output shaft. The feed screw mechanism has a male spiral groove formed in the outer peripheral surface of the output shaft; a nut cylinder secured on the inner peripheral side of the cylindrical member and formed with a plurality of circular holes; and a plurality of balls accommodated in the circular holes and engaged with the male spiral groove.

Electric linear actuator

Growing community of inventors

Fujisawa, Japan

Daisaku Kawada