Abstract: Provided is a fixed type constant velocity universal joint, in which: each of first track groove portions positioned on an interior side of an outer joint member includes an arc part having a curvature center that is positioned without being offset in an axial direction with respect to a joint center; the first track groove portions are inclined in a peripheral direction with respect to a joint axial line (N-N) and adjacent to each other in the peripheral direction with their inclination directions opposite to each other; each of second track groove portions positioned on an opening side is formed into a different shape from a shape of the each of the first track groove portions so as to increase an effective track length at a maximum operating angle; the each of the first track groove portions and the each of the second track groove portions are connected to each other at a position on the opening side with respect to the joint center; each of track grooves of an inner joint member is formed so as to be mirr

Abstract: Six track grooves formed in a spherical inner peripheral surface of an outer joint member are each formed into an arc shape having a curvature center at a joint center. The track grooves are inclined in a circumferential direction of the outer joint member with respect to a joint axial line, and are adjacent to each other in the circumferential direction with their inclination directions opposite to each other. Six track grooves formed in a spherical outer peripheral surface of an inner joint member are formed so as to be mirror-image symmetrical with the track grooves paired therewith of the outer joint member with respect to a joint center plane at an operating angle of 0°. An inclination angle of each of the track grooves of the outer joint member with respect to the joint axial line is set to 8° or more and 16° or less.

Abstract: Provided is a fixed type constant velocity universal joint (1) of a track groove crossing type, in which track grooves (9) of an inner joint member (3) are formed so as to be mirror-image symmetrical with the paired track grooves (7) of an outer joint member (2) with respect to a joint center plane (P) at an operating angle of 0°. The track grooves (7, 9) of both the joint members (2, 3) each have a length corresponding to a maximum operating angle (?max) required for a propeller shaft, and surface treatment is performed, for example, on a defined surface of each of the track grooves (7) of the outer joint member (2) so as to reduce frictional resistance (sliding resistance) against balls (4).

Abstract: Provided is a fixed type constant velocity universal joint (1) of a track groove crossing type, in which track grooves (9) of an inner joint member (3) are formed so as to be mirror-image symmetrical with the paired track grooves (7) of an outer joint member (2) with respect to a joint center plane (P) at an operating angle of 0°. The track grooves (7, 9) of both the joint members (2, 3) each have a length corresponding to a maximum operating angle (?max) required for a rear-wheel drive shaft. Further, each axial clearance (?Sia1, ?Sia2) between the inner joint member (3) and the cage (5) is set larger than an axial clearance (?Tao+?Tai) formed by a ball track clearance (?T) between each of balls (4) and each track groove (7, 9).

Abstract: A constant velocity universal joint smoothly operates under load and during speed rotation, and also suppresses heat generation and has enhanced durability. An offset in an axial direction between a center of curvature of each of track grooves and a center of curvature of an inner surface of an outer joint member, and an offset in the axial direction between a center of curvature of each of track grooves and a center of curvature of an outer surface of an inner joint member are each set to zero. The track grooves of the outer and inner joint members are each inclined with respect to an axial line. A circumferential length of each of pockets of a cage is set so that two pockets allow balls to be assembled therein at one time under a state in which the two pockets are exposed.

Abstract: Provided is a fixed type constant velocity universal joint, in which: each of first track groove portions positioned on an interior side of an outer joint member includes an arc part having a curvature center that is positioned without being offset in an axial direction with respect to a joint center; the first track groove portions are inclined in a peripheral direction with respect to a joint axial line (N-N) and adjacent to each other in the peripheral direction with their inclination directions opposite to each other; each of second track groove portions positioned on an opening side is formed into a different shape from a shape of the each of the first track groove portions so as to increase an effective track length at a maximum operating angle; the each of the first track groove portions and the each of the second track groove portions are connected to each other at a position on the opening side with respect to the joint center; each of track grooves of an inner joint member is formed so as to be mirr

Abstract: A fixed type constant velocity universal joint has track grooves of an outer joint member including first and second track groove portions located on depth and opening sides, respectively. The first track groove portions each have a circular-arc part having a curvature center that is not offset in an axial direction with respect to a joint center, are inclined in a circumferential direction with respect to a joint axial line, and are adjacent to each other in the circumferential direction with their inclination directions opposite to each other. The second track groove portions have a different shape than the first track groove portions to increase an effective track length with respect to a maximum operating angle. The first and second track groove portions are connected respectively to each other on the opening side with respect to the joint center.

Abstract: A fixed type constant velocity universal joint includes eight or twelve torque transmitting balls arranged in ball tracks formed of pairs of track grooves of an outer joint member and track grooves of an inner joint member, respectively. A center of curvature of each of the track grooves of the outer joint member and a center of curvature of each of the track grooves of the inner joint member have an axial offset of zero. When eight torque transmitting balls are employed, the track grooves of the outer joint member and the inner joint member each include inclined tracks arranged at a 90° pitch along a circumferential direction and inclined in opposite directions with respect to an axial line and other tracks which are formed between the inclined tracks and parallel to the axial line.

Abstract: A fixed type constant velocity universal joint prevents heat generation when a high load is applied or during high-speed rotation to improve durability, and suppresses a contact resistance between a cage and inner and outer races to improve constant velocity performance. Curvature centers of track grooves of outer and inner joint members have an offset of 0 in an axial direction. Track grooves of the outer and inner joint members, which are tilted in opposite directions from each other with respect to an axis line, are alternately formed in a circumferential direction. An outer surface of the inner joint member is a spherical surface to be brought into sliding contact with an inner spherical surface of the cage. An inner surface of the outer joint member is a cylindrical surface.

Abstract: A fixed type constant velocity universal joint is configured such that an axial offset amount of a curvature center of each track groove of an outer joint member and an axial offset amount of a curvature center of each track groove of an inner joint member are zero. Track grooves of the outer joint member are formed alternately in a circumferential direction to be inclined in mutually opposite directions with respect to an axis, and track grooves of the inner joint member are formed alternately in the circumferential direction to be inclined in mutually opposite directions with respect to the axis. An outer surface of the inner joint member is formed into a spherical surface which is held in slide-contact with an inner spherical surface of a cage. An inner surface of the outer joint member is formed into a cylindrical surface.

Abstract: A constant velocity universal joint smoothly operates under load and during speed rotation, and also suppresses heat generation and has enhanced durability. An offset in an axial direction between a center of curvature of each of track grooves and a center of curvature of an inner surface of an outer joint member, and an offset in the axial direction between a center of curvature of each of track grooves and a center of curvature of an outer surface of an inner joint member are each set to zero. The track grooves of the outer and inner joint members are each inclined with respect to an axial line. A circumferential length of each of pockets of a cage is set so that two pockets allow balls to be assembled therein at one time under a state in which the two pockets are exposed.

Abstract: A fixed type constant velocity universal joint has track grooves of an outer joint member including first and second track groove portions located on depth and opening sides, respectively. The first track groove portions each have a circular-arc part having a curvature center that is not offset in an axial direction with respect to a joint center, are inclined in a circumferential direction with respect to a joint axial line, and are adjacent to each other in the circumferential direction with their inclination directions opposite to each other. The second track groove portions have a different shape than the first track groove portions to increase an effective track length with respect to a maximum operating angle. The first and second track groove portions are connected respectively to each other on the opening side with respect to the joint center.

Abstract: A fixed type constant velocity universal joint prevents heat generation when a high load is applied or during high-speed rotation to improve durability, and suppresses a contact resistance between a cage and inner and outer races to improve constant velocity performance. Curvature centers of track grooves of outer and inner joint members have an offset of 0 in an axial direction. Track grooves of the outer and inner joint members, which are tilted in opposite directions from each other with respect to an axis line, are alternately formed in a circumferential direction. An outer surface of the inner joint member is a spherical surface to be brought into sliding contact with an inner spherical surface of the cage. An inner surface of the outer joint member is a cylindrical surface.

Abstract: A fixed type constant velocity universal joint prevents heat generation when a high load is applied or during high-speed rotation to improve durability, and suppresses contact resistance between a cage and inner and outer races to improve constant velocity performance. Curvature centers of track grooves of outer and inner joint members have an offset of 0 in an axial direction. Track grooves of the outer joint member and the inner joint member, which are tilted in opposite directions from each other with respect to an axis line, are alternately formed in a circumferential direction. An outer surface of the inner joint member is a spherical surface which is to be brought into sliding contact with an inner spherical surface of the cage. An inner surface of the outer joint member is a cylindrical surface.

Abstract: Provided is a fixed type constant velocity universal joint which suppresses heat generation under high load and in high speed rotation, has a higher durability, and involves less torque loss. The fixed type constant velocity universal joint includes eight or twelve torque transmitting balls (27) arranged in ball tracks formed of pairs of track grooves (22) of an outer joint member (23) and track grooves (25) of an inner joint member (26), respectively. A center of curvature (O1) of each of the track grooves (22) of the outer joint member (23) and a center of curvature (O2) of each of the track grooves (25) of the inner joint member (26) have an axial offset of zero.

Abstract: A fixed type constant velocity universal joint is capable of reducing the size and weight of a cage while keeping the strength of the cage, and is also capable of improving the high angle strength and the durability. An offset angle ?CAGE of the cage, which is defined by lines that connect a center curvature of an inner spherical surface and a center curvature of an outer spherical surface of the cage and centers of torque transmission balls, and a line that connects the centers of the torque transmission balls and a joint center in a state where a joint operating angle is 0°, is set in a range of 2.7°??CAGE<5.7°.

Abstract: A fixed type constant velocity universal joint is capable of, without involving decreases in load capacity of an inner joint member (inner member) and in spherical area, increasing rigidity of a cage and stabilizing durability. The cage has four pockets including a pair of long pockets with large circumferential intervals and a pair of short pockets with small circumferential intervals. The pair of long pockets can be shifted by 180 degrees along a circumferential direction, and the pair of short pockets can be shifted by 180 degrees along the circumferential direction. The long pockets and the short pockets are arranged alternately to each other along the circumferential direction. Two balls are accommodated in each of the long pockets, while one ball is accommodated in each of the short pockets. A cutout portion is provided to an inner end portion of at least one of the track grooves of the inner member.

Abstract: A fixed type constant velocity universal joint is capable of securing a ball groove depth larger than conventional products and enhancing performance without an increase in a “force of pushing out balls in an axial direction”, the force having an influence on joint efficiency. In the fixed type constant velocity universal joint, a center of each of a plurality of guide grooves of an outer joint member and a center of each of a plurality of guide grooves of an inner joint member are offset with respect to a spherical surface center of an inner surface and a spherical surface center of an outer surface. A ratio (F/PCR) of an offset amount F to a length of a segment (PCR) ranges from 0.045 to 0.065. A ratio (?t/?) when an angle ? is the total of an angle ?t and an angle ?c ranges from 0.45 to 0.65.

Abstract: Provided is a fixed type constant velocity universal joint capable of suppressing heat generation under high load and during high-speed rotation to improve durability, and suppressing a contact resistance between a cage and inner and outer joint members to improve the constant velocity property. An axial offset amount of a curvature center of each track groove (22) of an outer joint member (23) and an axial offset amount of a curvature center of each track groove (25) of an inner joint member (26) are zero. Track grooves (22a, 22b) of the outer joint member (23) are formed alternately in a circumferential direction to be inclined in mutually opposite directions with respect to an axis, and track grooves (25a, 25b) of the inner joint member (26) are formed alternately in the circumferential direction to be inclined in mutually opposite directions with respect to the axis.

Abstract: Provided is a fixed type constant velocity universal joint, which is capable of preventing heat generation when high load is applied or during high-speed rotation to improve durability, and further, suppressing a contact resistance between a cage and inner and outer races to improve constant velocity performance. A curvature center of a track groove (22) of an outer joint member and a curvature center of a track groove (25) of an inner joint member have an offset of 0 in an axial direction. Track grooves (22a, 22b, 25a, 25b) of the outer joint member and the inner joint member, which are tilted in opposite directions from each other with respect to an axis line, are alternately formed in a circumferential direction. An outer surface (24) of the inner joint member is a spherical surface which is to be brought into sliding contact with an inner spherical surface (28b) of the cage (28). An inner surface (21) of the outer joint member is a cylindrical surface.