Tripod type constant velocity universal joint
AssigneeNtn Corporation
InventorTaku ITAGAKI
Life of this patent
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Abstract
In a tripod type constant velocity universal joint 1 of a double roller type, a carbon content in a core portion of a tripod member 3 is set to 0.23 to 0.44%, and a hardened layer 16 of a carburized layer is provided on the surface of a leg shaft 32. A first region P having a radius of curvature Ra in a cross section in a direction orthogonal to a joint axial direction including an axial line of the leg shaft 32 and a second region Q having a radius of curvature Rb in a cross section in the joint axial direction including the axial line of the leg shaft 32 are provided in an intermediate portion 33 provided between a body portion 31 of the tripod member 3 and the leg shaft 32. Ra>Rb is set.
Claims6
A tripod type constant velocity universal joint comprising:
- an outer joint member including track grooves, which extend in a joint axial direction, at three locations in a circumferential direction, each of the track grooves having a pair of roller guide surfaces arranged to face each other in a joint circumferential direction;
- a tripod member including a body portion having a central hole, three leg shafts projecting in a radial direction of the body portion, and an intermediate portion located between the body portion and the leg shafts and having a cross section formed in a curve shape, the cross section including an axial line of each of the leg shafts, the tripod member made of a steel material;
- a roller mounted on each of the leg shafts;
- and
- an inner ring that is externally fitted to each of the leg shafts and rotatably supports the roller,
- the roller being movable in an axial direction of the outer joint member along the roller guide surfaces,
- the roller and the inner ring forming a roller unit swingable with respect to the leg shafts,
- the tripod member having a carbon content of 0.23 to 0.44% at a core portion,
- each of the leg shafts being provided with a hardened layer of a carburized layer on a surface of each of the leg shafts,
- wherein a first region having a radius of curvature Ra in a cross section, which includes the axial line of each of the leg shafts, in a direction orthogonal to the joint axial direction and a second region having a radius of curvature Rb in a cross section, which includes the axial line of each of the leg shafts, in the joint axial direction are provided in the intermediate portion of the tripod member, and Ra>Rb is satisfied.
Dependencies are inferred from the claim text.