Retaining device for an electric motor

Details Retaining device for an electric motor Retaining device for an electric motor

1999-02-05

2000-06-20

Ramirez, Ramon O.

Supports

Resilient support

Including three or more circumferentially arranged resilient...

248604, 248605, 310 51, 267158, 267160, F16M 1300, H02K 524, F16F 118

Patent

active

060767952

DESCRIPTION:

BRIEF SUMMARY
The invention is based on a retaining device for an electric motor by the preamble to.
A retaining device for an electric motor is already known (U.S. Pat. No. 4,063,060), in which three rotationally flexible retaining arms on the order of leaf springs are provided. The retaining arms are deployed in radiating fashion between the electric motor and the receiving housing, offset from one another by equal circumferential angles, and are each secured rigidly by one end to the electric motor and by the other end, with the interposition of elastic buffers. The retaining arms are joined to an inlet collar that is firmly connected to the receiving housing. These retaining arms effect an elastic binding of the electric motor to the receiving housing and thus damp the transmission of running noise and operation-dictated vibration of the blower to the receiving housing, caused for instance by imbalance in the blower wheel, so that a considerable reduction in noise development is achieved. By means of the three-point suspension of the electric motor in a single plane and the low spring constant of the retaining arms in the direction of torsion, the motor executes relatively major vibration and tilting motions, which in the elastic elements, especially the buffers, induce shear forces that rapidly cause material fatigue and damage. The service life of this known retaining device is therefore relatively limited and is inadequate for use in motor vehicles, in which the elastic elements must also absorb vibration caused by shocks from the roadway to the electric motor.
In one such retaining device in accordance with U.S. Pat. No. 4,161,667, the retaining arms on the order of leaf springs each have a respective axial portion, between their two ends, that extends in the direction of the motor pivot axis.
A retaining device is also known (German Utility Model DE 91 08 745 U1) with a receiving housing into the receiving opening of which a motor housing of an electric motor protrudes. An intermediate bush is slipped onto the motor housing with radial spacing and is firmly retained by spring tongues. Between the receiving housing and the intermediate bush, a retaining body made of plastic is fastened; with an encompassing annular part it engages the receiving housing and the intermediate bush, and its three arm portions beginning at the annular part and extending axially rest on the receiving housing and, with a radial end portion, engage the intermediate bush.
German Patent Disclosure DE 27 27 119 A1 also discloses a retaining device in which spring-elastic retaining elements are joined on one end to a tubular retaining ring that force-lockingly engages the motor housing.
An object of the invention is to create a retaining device in which noise decoupling of the electric motor is done at such low frequencies that the resonant frequency of the spring-mass system formed by the electric motor and the retaining device is below the frequencies of the electric motor to be decoupled; even in rough operation in the motor vehicle, excessive stress on the retaining device does not occur, thus guaranteeing a long service life for the retaining device.
By disposing one stop element in the region of each retaining element, which stop element limits the amplitude of the vibrational motion of the retaining elements relative to the receiving housing, it is assured that in the case of resonance, for instance upon starting of the electric motor and when it is turned off or upon acceleration from outside from impacts and shocks, the maximum possible deflection of the electric motor relative to the receiving housing is limited, thus precluding excessive strain on the retaining device.
It is advantageous that by the disposition of two stop faces facing one another, the amplitude of the torsional motion of the retaining elements relative to the receiving housing upon a clockwise or counterclockwise rotation is limited.
It is also advantageous that the two stop faces, facing one another in the direction of the rotary motion, of the stop elements ex

REFERENCES:
patent: 5237871 (1993-08-01), Henderson et al.
patent: 5533704 (1996-07-01), Fischinger et al.
patent: 5786647 (1994-03-01), Vollmer et al.

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