# US 7,611,415 B1 · Shaft assembly with integrated constant velocity joint

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- Number: US 7,611,415 B1
- Document ID: US7611415B1
- Status: Granted
- Kind: B1
- Application number: 11/039,148
- Filed: 2005-01-19
- Granted: 2009-11-03
- Earliest claimed: 2005-01-19
- Assignees: GKN Driveline North America, Inc.
- Inventors: Frederick J. Uchman
- Web page: https://patentgrep.com/patent/US7611415B1

## CPC

- F16D 3/20: one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members (F16D3/18, F16D3/24 take precedence)
- F16D 1/06: for attachment of a member on a shaft or on a shaft-end (attachment of marine propellers on shafts B63H23/34)
- F16D 3/2055: {having three pins, i.e. true tripod joints}
- Y10S 464/905: Torque transmitted via radially extending pin
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A shaft assembly comprises a tubular shaft and a joint, wherein at least a portion of the joint is disposed within the tubular shaft. The present invention may also include a shaft assembly comprising a shaft and a constant velocity joint wherein the constant velocity joint is integrated into the shaft by inserting at least a portion of the constant velocity joint into the shaft. In one method of the invention, the method comprises the steps of integrating a constant velocity joint into a propeller shaft by inserting at least a portion of the constant velocity joint into the propeller shaft.

## Claims

### Claim 1

A shaft assembly comprising:
a tubular shaft;
a tripod constant velocity joint at least partially disposed within the tubular shaft, the joint engaging an inner surface of the shaft; and
a seal connected to the tubular shaft, the seal engaging an entire outer circumferential perimeter of the joint at a location inboard of the ends of the joint, wherein the portion of the joint disposed within the tubular shaft is fixedly connected to the tubular shaft.

### Claim 2 (depends on 1)

The shaft assembly of claim 1, wherein the tubular shaft has a cylindrical inner surface.

### Claim 3 (depends on 1)

The shaft assembly of claim 1, wherein the joint includes an outer race having a plurality of lobes.

### Claim 4 (depends on 3)

The shaft assembly of claim 3, further including a gap between an outer surface of the outer race and the tubular shaft.

### Claim 5 (depends on 4)

The shaft assembly of claim 4, wherein a portion of the seal is disposed in the gap between the outer surface of the outer race and the tubular shaft.

### Claim 6 (depends on 1)

The shaft assembly according to claim 1, wherein the joint is secured to the shaft by welding the constant velocity joint to the shaft.

### Claim 7 (depends on 1)

The shaft assembly according to claim 1, wherein the joint is integrated into the shaft by forming an interference fit between the constant velocity joint and the shaft.

### Claim 8 (depends on 1)

The shaft assembly according to claim 1, wherein the seal is secured to an end of the joint such that an end of the shaft is flush with respect to an end of the seal when the joint is integrated into the shaft.

### Claim 9 (depends on 1)

The shaft assembly according to claim 1, wherein an end of the joint and an end of the shaft are positioned at a distance with respect to each other when the joint is integrated into the shaft.

### Claim 10 (depends on 9)

The shaft assembly of claim 9, wherein the end of the joint is spaced inwardly from an end of the shaft.

### Claim 11 (depends on 9)

The shaft assembly of claim 9, wherein the seal is disposed around and is in contact with the end of the joint.

### Claim 12 (depends on 1)

The shaft assembly of claim 1, wherein an outer periphery of the joint and an inner periphery of the shaft define a continuous uninterrupted circumferential gap between the shaft and the joint.

### Claim 13 (depends on 1)

The shaft assembly of claim 1, wherein an outer periphery of the joint and an inner periphery of the shaft define a continuous uninterrupted circumferential gap between the shaft and the joint, the seal disposed within the gap so as to circumferentially fill the entire gap.

### Claim 14 (depends on 1)

The shaft assembly of claim 1, wherein the joint includes an outer race having a plurality of lobes, at least one of the plurality of lobes includes a first portion and a second portion aligned along a common axial line with the first portion, the first portion engages the tubular shaft and the second portion is displaced away from the shaft and engages the seal.

### Claim 15 (depends on 1)

The shaft assembly of claim 1, wherein the tubular shaft is at least one of a propeller shaft and a drive shaft, each of which is operable for transferring a torque.