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Electric machine

A kind of bearing and cylindrical bearing technology, applied in the field of motor, to achieve the effect of smooth operation

Inactive Publication Date: 2007-08-22
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this axial play should also not be too large, as this would have a negative effect on the noise or vibration behavior of the motor (so-called axial vibrations) and on the service life

Method used

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Embodiment Construction

[0025] Figure 1 shows a simplified longitudinal section of a rotating electric machine. The electric machine is an electric motor 10 which is used in motor vehicles, for example, in window lifters, wiper drives, preferably in heating drives and / or fan drives or the like. But it can also be a generator.

[0026] The electric motor 10 has a wound armature 12 which is arranged on a shaft 14 . The armature 12 is connected to a commutator 16 which in turn is connected to the brushes 18 of a brush holder 20 . Instead of the rectifier 16 , a current collector of the generator can also be provided.

[0027] The shaft 14 is supported in spherical cap bearings 22 and cylindrical bearings 24 . In the present embodiment, the bearings 22 , 24 are sintered bearings or plain bearings impregnated with oil. The spherical cap bearing 22 is arranged on a bearing pressure plate 26 in the area of ​​the brush holder 20 . The cylindrical bearing 24 is arranged on the output side in the end shie...

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Abstract

The invention relates to an electric machine (10), preferably a blower drive for a motor vehicle, comprising a shaft (14) which is mounted in at least two bearings having specific axial play. At least one bearing is secured in a bearing seat of an end shield (28.1, 28.2, 28.3) and is placed directly in the bearing seat. The at least one bearing is a cylinder bearing (24) having a cylindrical outer periphery and the bearing seat is a sleeve (36.1, 36.2) having a cylindrical internal diameter wherein the cylinder bearing (24) is secured to the outer periphery by means of a press seat and is maintained in an axial manner in the bearing seat by the thus obtained friction engagement. The advantage of said configuration is that a more precise adjustment of the anchor longitudinal play is possible. Also, no additional components, for example, retaining springs, are required.

Description

technical field [0001] The invention relates to an electric machine according to the preamble of claim 1 . Background technique [0002] An electric motor as described, preferably a fan drive for a motor vehicle, comprises a shaft supported with axial play in at least two bearings, wherein at least one bearing is fixed in a bearing housing of a bearing end shield and directly against the against the bearing housing. [0003] High demands are placed on electric motors such as are commonly used in heating and air conditioning motors with regard to the longitudinal clearance of the armature. The axial play should be, for example, 0.1 to 0.3 mm, which is a very important parameter for ensuring the function of the motor. The main task is to leave a certain axial clearance between the bearing and the armature to meet the temperature range of -40°C to +80°C. However, this axial play should also not be too large, since this would have a negative effect on the noise or vibration b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K5/167H02K15/16
CPCY10T29/49945Y10T29/49012H02K5/1672Y10T29/53078H02K15/16H02K5/16
Inventor W·温克勒M·海德里奇H·-P·斯巴彻F·斯尔瓦C·厄恩斯特
Owner ROBERT BOSCH GMBH
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