Jtekt Corporation

Toyota Jidosha Kabushiki Kaisha

Toyoda Koki Kabushiki Kaisha

Nachi - Fujikoshi Corporation

Yoyoda Koki Kabuhsiki Kaisha

Atsushi Ando

Isashi Kashiwagi

Kazuyuki Ichikawa

Motoyasu Yamamori

Minoru Wakamatsu

Hiromichi Ohta

Takeo Yamamoto

Junji Ando

Yoshinobu Katoh

Tsune Kobayashi

Takumi Matsumoto

Hiromichi Ota

Tohru Onozaki

Tomohiko Sato

Naomasa Mukaide

Hideki Shibata

Takane Mitomi

Akira Saito

Hisataka Sato

Kazuya Hattori

Tomohiro Honda

Nobuaki Shibata

Katsuhito Yoshinaga

Hiroyuki Iwashita

Yosei Ando

Tomohiko Haruyama

Mayuko Wakida

Frédéric Dandault-Kamitani

Hiroyuki Sawaki

Mitsunori Nakamura

Koji Nagumo

Yoshinobu Kato

Yosuke Nishimura

Motion assisting device

A housing is provided with a partition wall portion that partitions an inner space of the housing into an electric motor accommodating space and a speed reducer accommodating space. The partition wall portion fixes a gear that constitutes a speed reducer. In addition, the partition wall portion has a housing boss portion, and an inner stator is fixed to the housing boss portion. Thus, heat generated by the inner stator is dissipated to the outside through the housing boss portion and the partition wall portion.

Electric rotary actuator

A speed change gear includes: an internal gear member; an eccentric member; an oscillating member; a pair of first and second rotating members; and a pin that is supported at both ends by insertion holes of the first and second rotating members. The insertion hole and the insertion hole have the same diameter. The outside diameter of the other side end portion of the pin is smaller than the outside diameter of one side end portion of the pin such that the one side end portion is press-fitted in the corresponding insertion hole and the other side end portion is supported by the corresponding insertion hole.

Speed change gear and manufacturing method therefor

An easily structured swing internal contact type planetary gear device is proposed which can achieve a higher meshing ratio when an involute tooth profile is adapted. Each of an internal tooth of an internally toothed gear wheel and an external tooth of an externally toothed gear wheel is formed with an involute tooth profile. Under a driving condition, one of an internal tooth body of the internally toothed gear wheel and an external tooth body of the externally toothed gear wheel is elastically deformed in an extending direction and the other thereof is elastically deformed in a contracting direction so that the number of meshing teeth becomes larger than the number of meshing teeth under a non-driving condition.

Swing internal contact type planetary gear device and rotation drive device

A constant velocity universal joint is provided, having a hollow outer joint member, an inner joint member, an outer roller including a cylindrical surface, an inner roller including a concave sphere, and plural leg shafts each including a convex sphere formed in a tip portion and engaging with the concave sphere, where the cylindrical surface of the outer roller satisfies the following:1&#x3e;(1&#x2212;cos &#x3b8;)/2+&#x3bc;+&#x3bc;12&#x3e;3(1&#x2212;cos &#x3b8;)/2&#x2212;&#x3bc;+&#x3bc;1,where Windicates a length of the cylindrical surface from a center of the leg shaft and an intersection of the cylindrical surface and an upper side taper portion of the outer roller, Windicates a length of the cylindrical surface from the center of the leg shaft and an intersection of the cylindrical surface and a lower side taper portion of the outer roller, and &#x3b8; indicates a maximum joint angle.

Constant velocity universal joint

A compact tripod type constant velocity joint with double roller type roller units capable of preventing plastic deformation of snap rings in assembling. In each of the roller units, an outer roller has an inner diameter 'Do' of 26.4 mm or less. The inner diameter 'Do' (mm) of the outer roller, a groove depth &#x2018;Depth&#x2019; (mm) of engaging grooves formed on the outer roller and an outer diameter &#x2018;Ds&#x2019; (mm) of the snap rings satisfy the formula below. Then, in a state where the snap rings are seated in the engaging grooves, diametrical gaps of 0.1 mm or more are formed between outer peripheral ends of the snap rings and groove bottoms of the engaging groove.+2&#xd7;Depth&#x2212;&#x2267;0.1.

Tripod type constant velocity joint

In a tripod-type constant velocity joint having an inner joint member, an outer joint member, and three roller units, the radius R, outer width W, and inner width Wof the outer periphery cylindrical surface of each roller unit, and the radius Rof the center hole of each roller unit satisfy the inequalities: 0.5Rtc(1/cos 0.3&#x2296;&#x2212;1)+(RR)&#x3bc;&#x3c;Wand 1.5Rtc(1&#x2212;cos 0.3&#x2296;)+(R&#x2212;R)&#x3bc;&#x3c;W, where Rtc: the radius of a circle passing through the respective centers of tripod spherical surfaces of the inner joint member, &#x2296;: the maximum joint angle between the outer joint member and the inner joint member, and &#x3bc;: coefficient of friction between each tripod spherical surface and the wall surface of the center hole of the corresponding roller unit.

Tripod-type constant velocity joint

A constant velocity universal joint includes an inner race having an outer peripheral face on which inner grooves are formed, an outer race having an inner peripheral face on which outer grooves are formed, a plurality of balls each engaging with each pair of inner groove and outer groove, and an annular cage disposed between the inner race and the outer race and including window portions for retaining respective balls. A coefficient of sliding friction between the ball and a rolling face on the inner groove with which the ball is in contact, and a coefficient of sliding friction between the ball and a rolling face on the outer groove with which the ball is in contact are larger than a coefficient of sliding friction between the ball and a sliding face on the window portion with which the ball is in contact.

A constant velocity universal unit includes an outer joint member whose inner peripheral face is formed with three guide grooves, an inner joint member including three tripod shafts each formed with a tripod spherical face, three roller units each including an outer peripheral face and an inner peripheral face coaxially formed with each other. The guide groove includes a pair of strip-shaped inner side faces formed with a pair of guide projections having a substantially half arc shape in cross section whose diameter is smaller than a height of the inner side face of the guide groove. The constant velocity universal joint further includes an annular recess formed on a substantially center portion in a height direction of the outer peripheral face of the roller unit and engaging with the pair of guide projections in a rolling manner and rotatable relative to a central axis of the guide projection.

Growing community of inventors

Kariya, Japan

Atsushi Ando