Ntn Corporation

Tetsuro Kadota

Kennta Yamazaki

Takeshi Kohara

Hiromichi Bando

Yukio Asahara

Yoshimasa Ushioda

Hiroki Terada

Hiroyuki Matsuoka

Masaru Komatsu

Mamoru Watanabe

Yo Mihata

The constant velocity universal joint comprises an outer joint member that has three curved guide grooves formed in the axial direction on a spherical inner circumferential surface thereof, an inner joint member that has three curved guide grooves formed in the axial direction on a spherical outer circumferential surface thereof, three torque transmitting balls disposed in ball tracks that are formed by the coordination of the guide grooves of the outer joint member and the guide grooves of the inner joint member a cage that holds the balls and elastic pressing means interposed between the outer circumferential surface of the inner joint member and the inner circumferential surface of the cage

Constant velocity universal joint

The constant velocity universal joint comprises an outer joint member that has three curved guide grooves formed in the axial direction on a spherical inner circumferential surface thereof, an inner joint member that has three curved guide grooves formed in the axial direction on a spherical outer circumferential surface thereof, three torque transmitting balls disposed in ball tracks that are formed by the coordination of the guide grooves of the outer joint member and the guide grooves of the inner joint member , a cage that holds the balls , and elastic pressing means interposed between the outer circumferential surface of the inner joint member and the inner circumferential surface of the cage

A torsion spring received in a recess in an inner joint member is engaged at one end thereof with an engaging groove in a cage and at the other end with the wall surface of the recess, thereby constantly urging the cage against the inner joint member. As a result, a torque transmitting ball received in the pocket of the cage is elastically pressed against the narrow side (open side) of the wedge of the ball track by the cage, whereby the circumferential clearance between the guide groove and the torque transmitting ball disappears, preventing the rotation backlash of the joint.

Ball fixed type constant velocity joint having low rotational backlash

A slide type homokinetic universal joint which assures low slide resistance. A guide block is supported on each trunnion so as to be axially slidable with respect to the trunnion and so as for the trunnion to be pivotable with respect to the guide block. A ball circulation groove including a pair of straight paths is formed in each side of the guide block. Each track groove formed in the outer ring has flat sides. An arcuate ball rolling surface is formed at the outer-diameter side of each flat side of the track groove so as to smoothly connect with the flat side, so that the balls can smoothly circulate in the ball circulation groove.

Homokinetic universal joint having straight recirculating ball paths in

An inner roller is rotatably fitted on a trunnion of a tripod member through a plurality of needle rollers and held in position against slipping off the trunnion by a slip-off preventing ring and a stopper ring mounted on the distal end of the trunnion.

Homokinetic universal joint having decreased induced thrust

A homokinetic universal joint having an outer ring formed in its inner surface with three axial track grooves, a tripod member inserted in the outer ring and having three legs, and guide blocks pivotally and axially slidably mounted on the respective legs and received in the respective track grooves. The guide blocks are formed in each side thereof with a ball circulating passage having straight raceways. A plurality of balls are rollingly received in each ball circulating passage. The track grooves are formed at both sides thereof with raceway grooves extending parallel to the axis of the track grooves to guide the balls along the straight raceways.

Growing community of inventors

Iwata, Japan

Tetsuro Kadota