# US 5,704,124 A · Process for producing an axle bearing/bearing housing assembly

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- Number: US 5,704,124 A
- Document ID: US5704124A
- Status: Granted
- Kind: A
- Application number: 08/498,333
- Filed: 1995-07-05
- Granted: 1998-01-06
- Earliest claimed: 1994-06-07
- Assignees: Mercedes-Benz AG
- Inventors: Gerhard Trauzettel
- Web page: https://patentgrep.com/patent/US5704124A

## CPC

- F04D 29/049: Roller bearings
- B23P 11/025: {by using heat or cold}
- F04D 29/0462: {Bearing cartridges}
- F04D 29/628: {especially adapted for liquid pumps}
- F16B 4/006: {Shrinkage connections, e.g. assembled with the parts being at different temperature}
- F16C 33/08: Attachment of brasses, bushes or linings to the bearing housing
- F16C 35/02: in the case of sliding-contact bearings
- F16C 2360/44: Centrifugal pumps
- Y10T 29/49643: Rotary bearing
- Y10T 29/49865: by temperature differential [e.g., shrink fit]
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In a process for producing a shaft bearing-bearing housing assembly wherein the shaft bearing has an outer race firmly engaged in the bearing housing, a shaft bearing with a slightly conical outer surface is fitted into a slightly conical receiving bore formed in the bearing housing at an elevated temperature which is higher than the normal operating temperature of the bearing housing and the bearing housing is then permitted to cool down thereby providing for firm engagement of the shaft bearing outer race in the bearing housing.

## Claims

### Claim 1

A process for producing a shaft bearing-bearing housing assembly, in particular for a vehicle cooling-water pump, including a shaft bearing having an outer race with an outer surface which is firmly engaged by a surrounding annular surface of a bearing housing, said process comprising the steps of:
providing a shaft bearing with an outer race having a conical outer surface,
providing a bearing housing with a conical receiving bore corresponding to the conical outer surface of said shaft bearing outer race and said bearing housing having an annular surface consisting of a material which shrinks upon cooling,
fitting said shaft bearing into said receiving bore, while said bearing housing annular surface is at a temperature which is greater than a later operation temperature of said assembly, and
permitting said bearing housing to cool down so as to provide for firm engagement between the shaft bearing outer race and bearing housing annular surface.

### Claim 2 (depends on 1)

A process according to claim 1, wherein said outer surface of said shaft bearing outer race and said bearing housing annular surface are formed at a cone angle of between 1.9.degree. and 2.1.degree..

### Claim 3 (depends on 1)

A process according to claim 1, wherein said bearing housing is produced by an aluminum or magnesium casting process.

### Claim 4 (depends on 3)

A process according to claim 3, wherein, after said casting process, said bearing housing is subjected to a punch deburring step to remove burrs from said bearing housing and said shaft bearing is fitted into said receiving bore in said bearing housing immediately after said punch deburring step.

### Claim 5 (depends on 3)

A process according to claim 3, wherein, after said casting process, said bearing housing is permitted to cool down to ambient temperature and is reheated before said shaft bearing is fitted into said receiving bore.

### Claim 6 (depends on 1)

A process according to claim 1, wherein said shaft bearing outer race is provided with a rough outer surface before it is fitted into said receiving bore.

### Claim 7 (depends on 1)

A process according claim 1, wherein a unitized axial slide ring seal is fitted in the region of said axial shaft bearing which interacts with the cone end section of said bearing housing annular surface which has the wider diameter.

### Claim 8 (depends on 1)

A process according to claim 1, wherein a combination structure comprising said shaft bearing and an axial slide ring seal is provided and said combination structure is fitted in an assembled state into said receiving bore.