Abstract: A fixed constant velocity universal joint using eight torque transmitting balls hasa ratio which a non-hardened layer assumes in a bar 48 of a cage 40 is set to be 0.30?C/S?0.75, where S represents a cross-sectional area of the bar 48 and C represents an area of the non-hardened layer.

Abstract: A constant velocity universal joint has an outer joint member having eight curved track grooves axially extending along an inner circumferential surface, an inner joint member having eight curved track grooves axially extending along an outer circumferential surface, eight balls respectively arranged in eight ball tracks provided as pairs of the track grooves of the outer and inner joint members. The center of each track groove of the outer joint member is axially displaced a predetermined distance from the spherical center of the inner circumferential surface. The center of each track groove of the inner joint member is axially displaced the same distance from the spherical center of the outer circumferential surface in the direction opposite to that of the outer joint member. A PCD gap in the ball track is in the range of 5 ?m to 50 ?m.

Abstract: In a drive shaft which is installed in a mounted type vehicle designed to traverse uneven terrains and which transmits drive power to the wheels through constant velocity joints on the inboard and outboard sides, a double offset type constant velocity joint is used on the inboard side and an undercut free type constant velocity joint is used on the outboard side, the ratio of the PCD of the double offset type constant velocity joint to the ball diameter (PCD/d=r1) being in the range 3.0<r1<3.2.

Abstract: A novel constant velocity universal joint with eight ball is provided for realizing the improved durability of the joint under high-loaded conditions and the suppressed variations of lifetimes of the joints. The universal joint has an outer joint member having eight curved track grooves axially extending along an inner circumferential surface with a spherical shape, an inner joint member having eight curved track grooves axially extending along an outer circumferential surface with a spherical shape, eight balls respectively arranged in eight ball tracks provided as pairs of the track grooves of the outer joint member and the track grooves of the inner joint member, and a cage having pockets for respectively holding the balls. The center of each track groove of the outer joint member is axially displaced a predetermined distance from the spherical center of the inner circumferential surface.

Abstract: The outer diameter of a joint outer ring is reduced using simple means, so that a constant velocity universal joint that can easily be reduced in weight and size is provided. It is an object to improve the unnerving vibrations, muffled noises, and the like. The constant velocity universal joint includes a joint outer ring having a plurality of track grooves formed in the inner circumference, a joint inner ring provided with track grooves corresponding to the track grooves of the joint outer ring, a plurality of balls provided in the ball tracks interposed between the joint outer ring and the joint inner ring and formed by cooperation of the track grooves to transmit torque, and a cage having pockets for retaining the balls. In the constant velocity universal joint having a plurality of vehicle body attachment flanges provided apart from each other in the outer circumferential direction of the joint outer ring and partly protruding in the radial direction.

Abstract: A constant velocity universal joint for use with a propeller shaft which reduces its weight and size as well as facilitates assembling a stub shaft, thereby reducing the number of parts used and improving rotational balance. The universal joint, comprising: an outer ring with a cup-shaped enlarged diameter portion having track grooves formed on an inner peripheral surface and with a hollow reduced diameter portion integrated with the enlarged diameter portion; an inner ring having track grooves formed on an outer peripheral surface; balls, interposed between the track grooves of the inner and outer rings, for transmitting torque; a cage, accommodated in an annular space between the inner and outer rings, for holding the balls.

Abstract: It is made easy to design so that the sliding resistance, when subjected to an impact in the axial direction, is kept within a prescribed value. A constant velocity universal joint is provided, which has track grooves extending in the axial direction on the outer circumference surface of the inner ring, and formed in an intersecting arrangement, and which also embeds balls in these track grooves. In this constant velocity universal joint, the cross-sectional shape of the track groove of the inner ring is constituted by a Gothic arch portion which is a Gothic arch shape up to a location that exceeds a contact point where the groove angular contacts with the ball, and a straight-line portion which is formed continuously with the Gothic arch portion, between the location exceeding the contact point and a shoulder portion of the track groove, and which extends in the direction of the tangent line at the location that exceeds the contact point.

Abstract: A fixed type constant velocity universal joint comprising an outer joint member (1) having eight arcuate guide grooves (1b) extending in the axial direction in an inner spherical surface (1a), an inner joint member (2) having eight arcuate guide grooves (2b) extending in the axial direction in an outer spherical surface (2a), eight balls (3) disposed between the guide grooves (1b) of the outer joint member (1) and guide grooves (2b) of the inner joint member (2), and a cage (4) interposed between the outer and inner joint members (1) and (2) for retaining the balls (3), in which center (P) of guide grooves (1b) of the outer joint member (1) is offset from center (O) of inner spherical surface (1a), and center (Q) of guide grooves (2b) of the inner joint member (2) is offset from center (O) of outer spherical surface (2a) by equal distance (PO=QO=F) to opposite sides in the axial direction, and the relation of 0.45?B/A?0.

Abstract: 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.

Abstract: A novel constant velocity universal joint with eight ball is provided for realizing the improved durability of the joint under high-loaded conditions and the suppressed variations of lifetimes of the joints. The universal joint has an outer joint member having eight curved track grooves axially extending along an inner circumferential surface with a spherical shape, an inner joint member having eight curved track grooves axially extending along an outer circumferential surface with a spherical shape, eight balls respectively arranged in eight ball tracks provided as pairs of the track grooves of the outer joint member and the track grooves of the inner joint member, and a cage having pockets for respectively holding the balls. The center of each track groove of the outer joint member is axially displaced a predetermined distance from the spherical center of the inner circumferential surface.

Abstract: A cage having a plurality of pockets, and a pair of end faces of each pocket formed in the cage that oppose each other in a circumferential direction of the cage are formed by surfaces cut after hardening and their surface hardness is reduced to a value lower than the surface hardness of a pair of side faces of each pocket that oppose each other in an axial direction of the cage to impart toughness to the bridge portions defined between the pockets and thus to increase the strength of the cage.

Abstract: Each pocket of a cage is composed of a pair of axial wall surfaces opposing each other along the axial line of the cage, a pair of circumferential wall surfaces opposing each other along the circumference direction of the cage, and radii linking the axial wall surfaces and circumferential wall surface. A ratio (R/d) of the radius of curvature R of the radii to the diameter d of the torque transmitting balls is set within a range 0.45 R/d 0.62. Also, the circumferential wall surfaces and radii are shaped along an arc having the radius of curvature R. Further, as to the axial wall surfaces, variance in the treatment margin is lessened by applying the grinding, hardened steel cutting, or the like after the heat treatment (carburized hardening and tempering) is applied to the cage.

Abstract: A constant velocity universal joint for use with a propeller shaft which reduces its weight and size as well as facilitates assembling a stub shaft, thereby reducing the number of parts used and improving rotational balance. The universal joint, comprising: an outer ring with a cup-shaped enlarged diameter portion having track grooves formed on an inner peripheral surface and with a hollow reduced diameter portion integrated with the enlarged diameter portion; an inner ring having track grooves formed on an outer peripheral surface; balls, interposed between the track grooves of the inner and outer rings, for transmitting torque; a cage, accommodated in an annular space between the inner and outer rings, for holding the balls.

Abstract: It is made easy to design so that the sliding resistance, when subjected to an impact in the axial direction, is kept within a prescribed value. A constant velocity universal joint is provided, which has track grooves extending in the axial direction on the outer circumference surface of the inner ring, and formed in an intersecting arrangement, and which also embeds balls in these track grooves. In this constant velocity universal joint, the cross-sectional shape of the track groove of the inner ring is constituted by a Gothic arch portion which is a Gothic arch shape up to a location that exceeds a contact point where the groove angular contacts with the ball, and a straight-line portion which is formed continuously with the Gothic arch portion, between the location exceeding the contact point and a shoulder portion of the track groove, and which extends in the direction of the tangent line at the location that exceeds the contact point.

Abstract: Each pocket of a cage is composed of a pair of axial wall surfaces opposing each other along the axial line of the cage, a pair of circumferential wall surfaces opposing each other along the circumference direction of the cage, and radii linking the axial wall surfaces and circumferential wall surface. A ratio (R/d) of the radius of curvature R of the radii to the diameter d of the torque transmitting balls is set within a range 0.45 R/d 0.62. Also, the circumferential wall surfaces and radii are shaped along an arc having the radius of curvature R. Further, as to the axial wall surfaces, variance in the treatment margin is lessened by applying the grinding, hardened steel cutting, or the like after the heat treatment (carburized hardening and tempering) is applied to the cage.

Abstract: It is proposed to increase the strength of a cage of a constant-velocity joint. A pair of end faces of each pocket formed in the cage that oppose each other in a circumferential direction of the cage are formed by surfaces cut after hardening and their surface hardness is reduced to a value lower than the surface hardness of a pair of side faces of each pocket that oppose each other in an axial direction of the cage to impart toughness to the bridge portions defined between the pockets and thus to increase the strength of the cage.

Abstract: A double offset type constant velocity universal joint for use in a power transmission system of an automobile comprises an inner member, an outer member, and a plurality of balls for transmitting torque between the Inner and outer members, the balls being retained by means of a cage also interposed between the inner and outer members, the cage being so designed as to allow the inner and outer members to move axially relatively to each other by an effective amount to absorb not only slight vibrations of an engine but also a greater movement of the engine caused by starting acceleration of the automobile.