Fixed type constant velocity universal joint

Patent metadata

Field	Value
Publication number	US-10247250-B2
Application number	US-201415035052-A
Country	US
Kind code	B2
Filing date	Oct 22, 2014
Priority date	Nov 22, 2013
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

An outer joint member includes a cutout portion that is formed at least at each corner portion on an opening side of a cup section, which is defined between a radially inner opening end portion of each of track grooves and a radially inner spherical surface portion formed between the track grooves. The cutout portion is configured to prevent a cage from interfering with the outer joint member when the cage is incorporated into the outer joint member. The cutout portion and the track grooves of the outer joint member are finished by cold-forging ironing using a single ironing punch.

First claim

The invention claimed is:

1. A fixed type constant velocity universal joint, comprising:
an outer joint member comprising a cup section having a plurality of track grooves formed in a radially inner surface thereof;
an inner joint member having a plurality of track grooves formed in a radially outer surface thereof;
a plurality of torque transmitting balls, which are interposed between the plurality of track grooves of the outer joint member and the plurality of track grooves of the inner joint member, and are configured to transmit torque therebetween; and
a cage, which is interposed between the radially inner surface of the outer joint member and the radially outer surface of the inner joint member, the cage comprising pockets configured to retain the plurality of torque transmitting balls therein,
the outer joint member further comprising a cutout portion that is formed at least at each corner portion on an opening side of the cup section, which is defined between a radially inner opening end portion of each of the plurality of track grooves and a radially inner spherical surface portion formed between the plurality of track grooves, the cutout portion being configured to prevent the cage from interfering with the outer joint member when the cage is incorporated into the outer joint member, and
in a forging state of the outer joint member, the cutout portions and the plurality of track grooves of the outer joint member are cold-forging ironing finished using a single ironing punch.

2. The fixed type constant velocity universal joint according to claim 1 , wherein the cutout portions are formed into a round shape.

3. The fixed type constant velocity universal joint according to claim 2 , further comprising connecting portions formed between the cutout portions and the track grooves,
wherein the connecting portions are formed into a round shape.

4. The fixed type constant velocity universal joint according to claim 2 , further comprising:
a cup-inlet chamfer formed along an entire periphery of an opening portion of the cup section; and
a track-inlet chamfer formed at a boundary portion between each of the plurality of track grooves and the cup-inlet chamfer,
wherein the plurality of track grooves and the track-inlet chamfers are formed by cold-forging finishing.

5. The fixed type constant velocity universal joint according to claim 1 , further comprising connecting portions formed between the cutout portions and the track grooves,
wherein the connecting portions are formed into a round shape.

6. The fixed type constant velocity universal joint according to claim 5 , further comprising a track chamfer formed at a boundary portion between each of the plurality of track grooves and the radially inner spherical surface portion formed between the plurality of track grooves of the outer joint member,
wherein the track chamfers and the track grooves are continuously formed through intermediation of the connecting portions having the round shape.

7. The fixed type constant velocity universal joint according to claim 6 , further comprising:
a cup-inlet chamfer formed along an entire periphery of an opening portion of the cup section; and
a track-inlet chamfer formed at a boundary portion between each of the plurality of track grooves and the cup-inlet chamfer,
wherein the cup-inlet chamfer and the track-inlet chamfers are formed by cold-forging finishing.

8. The fixed type constant velocity universal joint according to claim 5 , further comprising:
a cup-inlet chamfer formed along an entire periphery of an opening portion of the cup section; and
a track-inlet chamfer formed at a boundary portion between each of the plurality of track grooves and the cup-inlet chamfer,
wherein the cup-inlet chamfer and the track-inlet chamfers are formed by cold-forging finishing.

9. The fixed type constant velocity universal joint according to claim 5 , further comprising:
a cup-inlet chamfer formed along an entire periphery of an opening portion of the cup section; and
a track-inlet chamfer formed at a boundary portion between each of the plurality of track grooves and the cup-inlet chamfer,
wherein the plurality of track grooves and the track-inlet chamfers are formed by cold-forging finishing.

10. The fixed type constant velocity universal joint according to claim 1 , wherein the fixed type constant velocity universal joint comprises a fixed type undercut-free constant velocity universal joint, in which a bottom surface of each of the plurality of track grooves of the outer joint member and a bottom surface of each of the plurality of track grooves of the inner joint member each comprise a circular-arc portion and a straight portion.

Assignees

• Kobayashi Tomoshige
• Masuoka Kouji
• Ntn Toyo Bearing Co Ltd

Inventors

• Kobayashi Tomoshige
• Masuoka Kouji

Classifications

• F16D2250/0023

  Shaping by pressure · CPC title

• F16D2003/22309

  Details of grooves · CPC title

• B23P2700/11

  Joints, e.g. ball joints, universal joints · CPC title

• F16D2003/22303

  Details of ball cages · CPC title

• F16D3/2237 Primary

  where the grooves are composed of radii and adjoining straight lines, i.e. undercut free [UF] type joints · CPC title