Ntn Corporation

Hiroshi Tone

Tohru Nakagawa

Hisaaki Kura

Masazumi Kobayashi

Tatsuhiro Goto

Manabu Hoshino

Wasaburo Suganuma

Hideki Kondo

Masamichi Nakamura

Internal dimensions for fixed-type constant velocity universal joints are defined to optimize the geometry of the components of the joints and to readily achieve a larger operating angle of the joints. In the joint, the track grooves of an outer ring and an inner ring are tapered by an angle not exceeding 12&#xb0;. The ratio (f/PCR) of the cage offset amount f to PCR is greater than 0 and smaller than or equal to 0.12. The ratio (Do/d) of the cage outer diameter (Do) to the ball diameter (d), the ratio (t/d) of the cage wall thickness (t) to the ball diameter (d), and the ratio (w/d) of the cage width (w) to the ball diameter (d) are such that 3.9&#x2266;Do/d&#x2266;4.1, 0.31&#x2266;t/d&#x2266;0.34, and 1.8&#x2266;w/d&#x2266;2.0, respectively. The end of the spherical outer surface of the cage adjacent to the open end is axially extended, and the end of the spherical inner surface of the cage adjacent to the open end is tapered so that the tapered surface has an increasing diameter toward the end of the spherical outer surface adjacent to the open end. Part of the spherical outer surface of the cage is cut on the open end side of pockets, and the outer diameter of the cage across the two opposing planer cut faces is smaller than the spigot diameter of the outer ring.

Fixed-type constant-velocity universal joint

An ATV drive shaft which can be produced at low costs is provided. In a drive shaft installed in an uneven terrain traversing, mounted type vehicle and adapted to transmit drive power to wheels through constant velocity joints Jand Jon the inboard and outboard sides, a double offset type constant velocity joint Jis used on the inboard side and an undercut free type constant velocity joint Jis used on the outboard side, and the track clearances of the constant velocity joints Jand Jare in the range of 20 &#x3bc;m-200 &#x3bc;m.

ATV drive shaft and constant velocity joint

A fixed type constant velocity joint is disclosed in which the angle defined by a straight line connecting a contact point between a cage and an outer joint member and a contact point between the cage and an inner joint member, and the centerline of the cage is made not more than 10 degrees.

Fixed type constant velocity joint

A constant velocity universal joint has a ring that is fitted on each trunnion and rotatably supports a corresponding roller so the roller is movable axially of an outer joint member along a roller guide surface. The outer circumferential surface of each trunnion has a straight shape, as viewed in the longitudinal section, and has, as viewed in the cross section, a shape which allows contact with the inner circumferential surface of the ring in a direction orthogonal to the axis of the outer joint member. A generatrix of the inner circumferential surface of the ring forms part of an ellipse having a major axis extending in a direction orthogonal to the axis of the ring or is composed of a central convex circular arc and a tangential line extending from an end portion of the circular arc to an end face of the ring.

Constant velocity universal joint

A fixed type constant velocity joint comprising an outer ring whose inner spherical surface is formed with a plurality of track grooves disposed at circumferentially equispaced intervals to extend axially toward an open end. An inner ring whose outer spherical surface is formed with a plurality of track grooves is paired with the track grooves of the outer ring disposed at circumferentially equispaced intervals to extend axially. A plurality of balls is interposed between the track grooves of the outer and inner rings to transmit torque. A cage is interposed between the inner spherical surface of the outer ring and outer spherical surface of the inner ring to hold the balls. The open-side groove bottom of each track groove of the outer ring is shaped as a taper linearly diameter-expanded toward the open end thereof.

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Iwata, Japan

Hiroshi Tone