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Shrink Fit Design for Attaching a Bearing Housing to a Base Casting

IP.com Disclosure Number: IPCOM000061957D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Good, DL: AUTHOR [+5]

Abstract

The bearing housing-base assembly is shown in the figure. The bearing housing 3 is shrink fitted into the base 4 with a tightly controlled interference. This interference allows very reliable control of the holding force and eliminates the possibility of shift of the housing 3 in any direction. In addition, shrink fitting housing 3 increases the stiffness and the natural frequency of the base-housing assembly.

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Shrink Fit Design for Attaching a Bearing Housing to a Base Casting

The bearing housing-base assembly is shown in the figure. The bearing housing 3 is shrink fitted into the base 4 with a tightly controlled interference. This interference allows very reliable control of the holding force and eliminates the possibility of shift of the housing 3 in any direction. In addition, shrink fitting housing 3 increases the stiffness and the natural frequency of the base-housing assembly.

The interference serves as a seal between the motor cavity 5 and the disk enclosure 6 which eliminates the need for a mechanical seal. Along with reducing cost, eliminating the seal screws allows the file to be designed into a more compact package.

Assembly and disassembly are achieved by utilizing the difference in thermal expansion of the base and housing to supply a clearance. These processes, in addition to being noncontaminating, are very cost efficient and lend themselves to high production rates.

The base and housing can be assembled outside the clean room and can be cleaned as an assembly, which saves valuable clean room assembly space.

Disclosed anonymously.

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