Machine element or mechanism – Gearing – Directly cooperating gears
Reexamination Certificate
1999-06-29
2001-02-06
Lorence, Richard M. (Department: 3681)
Machine element or mechanism
Gearing
Directly cooperating gears
C384S192000, C310S090000
Reexamination Certificate
active
06182523
ABSTRACT:
The present invention relates to a geared motor unit for operating a functional member of a motor vehicle.
More specifically, the invention relates to such a geared motor unit which comprises a motor portion and a gearing portion with worm and wheel, the worm of which is associated with the shaft of the motor and three bearings for guiding these, the first two of which are arranged one on each side of the motor portion and the third of which is arranged at the opposite end of the worm to the motor portion.
Such geared motor units for example form part of motor vehicle window-lifter mechanisms.
However, the structure of these geared motor units does have a certain number of drawbacks because it is extremely difficult to perfectly align the three bearings when mounting them.
This misalignment causes running noise and friction that leads to a reduction in the performance of the geared motor unit.
The object of the invention is therefore to solve these problems.
To this end, the subject of the invention is a geared motor unit for operating a functional member of a motor vehicle, of the type comprising a motor portion and a gearing portion with worm and wheel, the worm of which is associated with the shaft of the motor and three bearings for guiding these, the first two of which are arranged one on each side of the motor portion and the third of which is arranged at the opposite end of the worm to the motor portion, characterized in that the complementary contacting surfaces of the third bearing and/or of the worm have a bowed cross section.
REFERENCES:
patent: 3848477 (1974-11-01), Giandinoto et al.
patent: 4420703 (1983-12-01), Adam et al.
patent: 5325736 (1994-07-01), Tsujita
patent: 5886437 (1999-03-01), Bohn et al.
patent: 2016213 (1979-09-01), None
Carlson & Gaskey & Olds
Lorence Richard M.
Meritor Light Vehicle Systems (France)
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