# US 4,392,839 A · Drive shaft construction

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- Number: US 4,392,839 A
- Document ID: US4392839A
- Status: Granted
- Kind: A
- Application number: 06/238,446
- Filed: 1981-02-26
- Granted: 1983-07-12
- Earliest claimed: 1980-03-11
- Assignees: Lohr & Bromkamp GmbH
- Inventors: Erich Aucktor
- Web page: https://patentgrep.com/patent/US4392839A

## CPC

- F16C 3/02: Shafts; Axles
- F16D 3/227: the joints being telescopic
- F16D 2003/22313: {Details of the inner part of the core or means for attachment of the core on the shaft}
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A drive shaft construction particularly for a motor vehicle including a hollow tubular shaft having a pair of end portions formed with a splined configuration adapted to receive driving joints is structured so that the tubular shaft is formed with an intermediate portion having an outer diameter greater than the outer diameter of the end portions, with the wall thickness of the intermediate portion being between 1/8 and 1/15 of the outer diameter of the intermediate portions.

## Claims

### Claim 1

In a drive shaft construction for transmitting power in an automotive vehicle including an integral hollow tubular shaft having a pair of end portions formed with a splined configuration adapted for receiving driving joints, the improvement which comprises:
that said tubular shaft is formed with a portion intermediate said end portions having an outer diameter greater than the outer diameter of said end portions;
that the wall thickness of said intermediate portion is between 1/8 and 1/15 of said outer diameter of said intermediate portion; and
that said tubular shaft includes two transition portions extending respectively between said intermediate portion and each of said end portions, said transition portions being formed as stepped configurations each including at least two steps and each having a wall thickness which increases from said larger-diameter intermediate portion to said smaller-diameter end portions.

### Claim 2 (depends on 1)

A construction according to claim 1 wherein said end portions are formed with hollow openings, said hollow openings being closed by plug means.