An inner member of a constant velocity joint includes holding portions that hold roller assemblies. Each of the holding portions includes a first orthogonal part and a second orthogonal part brought into contact with an inner roller of the roller assembly. When first and second transmission shafts are coaxially disposed, top parts of the first and second orthogonal parts are brought into contact with the inner circumferential wall of the inner roller. The first and second orthogonal parts are each sectioned into a first curved surface extending from the proximal end of the holding portion to the top part and a second curved surface extending from the top part to the distal end of the holding portion. The curvature radius of the second curved surfaces is larger than the curvature radius of the first curved surfaces.

A constant velocity joint includes spherical rollers. At least parts of first inner bottom wall portions provided on an inner bottom wall surface of a cylindrical portion of the constant velocity joint are located in closer proximity to the side of an opening of the cylindrical portion than second inner bottom wall portions. When the spherical rollers are disposed at an innermost location inside the cylindrical portion and the axial directions of the spherical rollers are perpendicular to the axial direction of the cylindrical portion, at least parts of the first inner bottom wall portions abut against inner side outer circumferential surface portions of the spherical rollers, and the second inner bottom wall portions are separated away from outer side outer circumferential surface portions of the spherical rollers.

A method for manufacturing a trunnion for a constant velocity joint, the trunnion having a plurality of journal units provided outside around a hub unit, the method including a first step of manufacturing the trunnion, a second step of thermally treating a rounded outer circumferential surface of the journal unit, and a third step of thermally treating a connection unit disposed between the journal unit and the hub unit and having a diameter smaller than that of the journal unit.

A tripod constant-velocity joint including: an inner ring; three trunnions protruding from the inner ring; three roller units supported by the trunnions; and an outer ring storing the roller units. Each roller unit includes: an inner roller that is in contact with a convex outer-circumferential surface of the corresponding trunnion at a tangent point; an outer roller supported by the inner roller through rolling elements that are interposed between the inner and outer rollers; and a limiting portion protruding from the outer roller, so as to limit movements of the rolling elements and the inner roller. A clearance between the inner roller and the limiting portion is smaller than an axial length of a crowned end portion of each rolling element, and is larger than a stroke distance of reciprocating movement of the tangent point when a joint angle of the tripod constant-velocity joint is a predetermined value.

A constant velocity joint includes a trunnion extending radially outwardly about a trunnion axis, wherein the trunnion defines a parametric curve at an equatorial plane of the trunnion. The constant velocity joint also includes a ball surrounding the trunnion and rotatable relative thereto about a plurality of needle rollers.

A constant velocity joint includes an inner race having a main body defining a central opening. The constant velocity joint also includes a shaft member extending through the central opening, wherein the shaft member is staked to the inner race to axially retain the shaft member to the inner race.

An angle-adjustable tripod universal joint which has one tripod, three rollers and one universal joint outer part. An inner wall of the universal joint outer part has three roller tracks, and one roller is disposed in each of the roller tracks and rolls along the roller track. The inner cavity of each roller has a rotatably disposed spherical shaft head of the tripod. The inner wall of each roller track has a guiding groove. The peripheral shape of each roller is cylindrical. The bottom surface of the guiding groove is a plane surface, and two side surfaces of the guiding groove are flat surfaces perpendicular to the plane surface. The peripheral surface of each roller is partially inserted into the corresponding guiding groove, and the peripheral surface of the roller is tangent to the corresponding plane surface.

A method for manufacturing a trunnion for a constant velocity joint, the trunnion having a plurality of journal units provided outside around a hub unit, the method including a first step of manufacturing the trunnion, a second step of thermally treating a rounded outer circumferential surface of the journal unit, and a third step of thermally treating a connection unit disposed between the journal unit and the hub unit and having a diameter smaller than that of the journal unit.

A tripot housing includes a housing body that extends between a first housing end and a second housing end along a longitudinal central axis. The housing body defines a guide channel that extends from the first housing end toward the second housing end. The guide channel has a first wall, a second wall, and a third wall that extends between the first wall and the second wall. An elliptical contact surface area transitions the first wall with the third wall and the second wall with the third wall, with the elliptical contact surface areas being configured for engagement with an outer roller of a roller assembly to inhibit a locking condition.

A gimbal joint may employ a plurality of wear sleeves, each disposed between a pin or pin receptive bore of a first structure and a corresponding bore or pin of a second structure and between another pin or bore of the second structure and a corresponding bore or pin of a third structure. Each of these structures may be adapted to rotate in a single plane, with one structure adapted to also tilt about a first axis, and one other structure adapted to tilt about a second axis. Each integral flanged wear sleeve may comprise a right circular hollow cylindrical body portion, which may be interiorly sized to be retained on one of the pins and externally sized to be retained in one of the pin receptive bores, and a flange portion may radiate from one end of the cylindrical body portion.