# US 8,784,220 B1 · Plug-in CVJ assembly

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- Number: US 8,784,220 B1
- Document ID: US8784220B1
- Status: Granted
- Kind: B1
- Application number: 13/799,950
- Filed: 2013-03-13
- Granted: 2014-07-22
- Earliest claimed: 2013-03-13
- Assignees: NTN Bearing Coporation of America
- Applicants: NTN USA Corporation
- Inventors: Christopher Katke
- Web page: https://patentgrep.com/patent/US8784220B1

## CPC

- F16D 3/223: the rolling members being guided in grooves in both coupling parts
- F16D 2003/22316: {Means for fastening or attaching the bellows or gaiters}
- F16D 2300/08: Details or arrangements of sealings not provided for in group F16D3/84
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A powertrain assembly for use in a motor vehicle powertrain system having an output shaft forming a cylindrical outer surface, a splined end, and a radial shoulder, and a CVJ assembly having an inner race, and outer race. Ball elements are provided between the inner and outer races. A seal assembly is provided having a boot with an outer lip affixed to the CVJ outer race and an inner lip forming first and second radial faces and an inside cylindrical surface. Axial insertion of the output shaft splined end into the CVJ inner race splined bore causes the boot assembly inner lip to be expanded and frictionally engage with the output shaft cylindrical outer surface and wherein the boot inner lip first and second radial faces are clamped between the inner race radial surface and the shaft radial shoulder.

## Claims

### Claim 1

A powertrain assembly for use in a motor vehicle powertrain system, comprising:
an output shaft forming a cylindrical shaft surface, a radial shoulder, and a splined end,
a CVJ assembly having an inner race, and outer race, and ball elements therebetween, the inner race forming an inside splined bore and a radial face surface, and
a seal assembly having a boot with an outer lip affixed to the CVJ outer race and an inner lip forming first and second radial faces and an inside cylindrical surface, and wherein axial insertion of the output shaft splined end into the CVJ inner race splined bore causes boot inner lip to be expanded and frictionally engaged with the output shaft cylindrical shaft surface and wherein the boot inner lip first and second radial faces are clamped between the inner race radial surface and the shaft radial shoulder, wherein a portion of the boot inner lip is arranged radially between the output shaft and the CVJ inner race.

### Claim 2 (depends on 1)

The powertrain assembly in accordance with claim 1 further comprising the seal assembly having a seal ring and the outer lip bonded or otherwise affixed to the seal ring and the seal ring press fit onto the CVJ assembly outer race.

### Claim 3 (depends on 1)

The powertrain assembly in accordance with claim 1 further comprising the output shaft and the CVJ inner race forming respective annular grooves and a circlip fitting within the grooves when the assembly is in an assembled condition.

### Claim 4 (depends on 1)

The powertrain assembly in accordance with claim 1 further comprising the CVJ assembly outer race forming a tubular section joined to a propeller shaft tube by welding.

### Claim 5 (depends on 1)

The powertrain assembly in accordance with claim 1 further comprising the assembly output shaft coupled with a transmission or a transfer case.