Spring elemnt for compensating axial play in a motor shaft of an electric motor

a technology of axial play and electric motor, which is applied in the direction of sliding contact bearings, mechanical energy handling, mechanical apparatus, etc., can solve the problems of large number of parts required in order, distinctly audible impact noise, and increased wear

Inactive Publication Date: 2003-05-22
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The axial play in the motor shaft results in noise that is partially a function of the position of the electric motor and in part, leads to distinctly audible impact noises during changes in the rotation direction of the electric motor.
In addition, axial vibrations of the armature can occur, which result in noise and increased wear.
However, a large number of parts is required in order to install the spring washer.
The known spring element is therefore complex and expensive with regard to manufacture and installation.

Method used

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  • Spring elemnt for compensating axial play in a motor shaft of an electric motor
  • Spring elemnt for compensating axial play in a motor shaft of an electric motor

Examples

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Embodiment Construction

[0009] The spring element 10 according to the invention shown in FIG. 1 has an annular stop disk 12 which is connected to a hollow cylindrical support foot 16 by means of spring arms 14 that are distributed over the circumference. The stop disk 12, the spring arms 14, and the support foot 16 are made of one piece by means of plastic injection molding. In their middle section, the spring arms 14 extend in the circumference direction and at both ends, they are bent at right angles into an axially parallel direction; at their two ends, they transition in one piece into the stop disk 12 and / or into the support foot 16.

[0010] Due to the elasticity of the spring arms 14, the stop disk 12 is connected to the support foot 16 in an axially resilient fashion. A spring constant of the spring arms 14 is low so that an axial spring force of the spring element 10 is slight.

[0011] The hollow cylindrical support foot 16 is stepped on its inside. By means of the support foot 16, the spring element 1...

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Abstract

The invention relates to a spring element (10) for compensating for axial play in a motor shaft of an electric motor. The invention proposes embodying such a spring element (10) out of plastic and of one piece with a stop disk (12), which is connected via spring arms (14) to a support foot (16), and placing it, along with the support foot (16), onto a support sleeve (18) with which the spring element (10) can be press-fitted onto the motor shaft. The invention has the advantage that it eliminates the axial play in the motor shaft of an electric motor with a spring element (10) that is inexpensive to manufacture and easy to install (FIG. 1).

Description

PRIOR ART[0001] The invention relates to a spring element for compensating for axial play in a motor shaft of an electric motor, as generically defined by the preamble to the main claim.[0002] Motor shafts of known electric motors are supported with axial play in a motor housing. The axial play in the motor shaft is necessary because of or also as a result of manufacturing tolerances. In addition, an axial play in the motor shaft and the motor housing is necessary because of the different thermal expansions of the motor shaft and the motor housing. The axial play in the motor shaft results in noise that is partially a function of the position of the electric motor and in part, leads to distinctly audible impact noises during changes in the rotation direction of the electric motor. In addition, axial vibrations of the armature can occur, which result in noise and increased wear.[0003] For this reason, efforts have been made to compensate for the axial play in the motor shaft through ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16F1/36F16C25/04H02K5/24H02K7/08
CPCH02K7/083F16C25/04F16C2380/26
Inventor SCHILLER, HERBERTMARTIN, HERBERTBOLDT, MARKUSRETTMAR, ULRICH
Owner ROBERT BOSCH GMBH
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