Machine element or mechanism – Elements – Gear casings
Reexamination Certificate
2001-03-29
2002-10-15
Butler, Douglas C. (Department: 3683)
Machine element or mechanism
Elements
Gear casings
C074S425000
Reexamination Certificate
active
06463829
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application No. 2000-93769 filed on Mar. 30, 2000.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a geared motor.
2. Description of Related Art
As shown in
FIG. 8
, a geared motor
81
including a motor main body
82
and a speed reducing arrangement
83
secured to the motor main body
82
has been commonly used, for example, as a motor of a power window system. The motor main body
82
has a yoke housing
84
that receives an armature in a rotatable manner. The speed reducing arrangement
83
has a gear housing
88
. The gear housing
88
includes a worm housing segment
85
, a wheel housing segment
86
and an air passage accommodating segment
87
. The worm housing segment
85
receives a worm shaft that extends out from one end of a rotatable shaft of the armature. The wheel housing segment
86
receives a worm wheel
89
that is meshed with the worm shaft.
The worm wheel
89
is connected to an output plate
91
via a rubber damper
90
received in a recess formed in the worm wheel
89
. The output plate
91
is connected to an output shaft
92
that extends through and rotatably supported in a through hole of a shaft receiving portion
86
a
formed in the wheel housing segment
86
. The shaft receiving portion
86
a
rotatably supports the worm wheel
89
. When the worm shaft is rotated by a driving force transmitted from the rotatable shaft of the armature, the output shaft
92
is rotated via the worm wheel
89
, the rubber damper
90
and the output plate
91
. A vehicle door window glass moves downward or upward in a vertical direction based on rotation of the output shaft
92
.
The air passage accommodating segment
87
formed in the gear housing
88
is arranged at a base of the worm housing segment
85
. An air passage
93
is formed in the air passage accommodating segment
87
. The air passage
93
extends from an outer surface of the air passage accommodating segment
87
to an interior of the yoke housing
84
.
The geared motor
81
is assembled by connecting the motor main body
82
to the speed reducing unit
83
. More specifically, the geared motor
81
is assembled by connecting the yoke housing
84
to the gear housing
88
, for example, with bolts and nuts (not shown).
In the geared motor
81
, the yoke housing
84
of the motor main body
82
is typically molded from a metal material, and the gear housing
88
of the speed reducing arrangement
83
is typically molded from a resin material. Thus, during the vertical movement of the window glass with the aid of driving force conducted from the geared motor
81
, if a load applied on the window glass is excessively large, a corresponding large force is applied on the worm shaft via the worm wheel
89
. This large force flexes the gear housing
88
that has a relatively small strength. That is, although the gear housing
88
has the air passage accommodating segment
87
including the air passage
93
, the air passage accommodating segment
87
is only arranged at the base of the gear housing
88
. Thus, the air passage accommodating segment
87
does not reinforce the worm housing segment
85
and the wheel housing segment
86
. Thus, when the gear housing
88
is flexed, disengagement between the worm wheel
89
and the worm shaft is likely to occur.
The present invention addresses the above disadvantage. Thus, it is an objective of the present invention to provide a geared motor including a gear housing that has an improved strength provided by a simple structure to withstand flexing caused by a larger force generated between a worm wheel and a worm shaft, thereby reducing a possibility of disengagement between the worm wheel and the worm shaft upon application of the larger force therebetween.
SUMMARY OF THE INVENTION
It is another objective of the present invention to provide a geared motor having a gear housing that has an improved strength provided by a simple structure including an effective air passage communicating an interior of the geared motor to atmosphere such that the gear housing can withstand flexing caused by a larger force generated between a worm wheel and a worm shaft, thereby reducing a possibility of disengagement between the worm wheel and the worm shaft upon application of the larger force therebetween.
To achieve the objectives of the present invention, there is provided a geared motor including a yoke housing and a gear housing. The yoke housing has an opening and receives a motor unit. The gear housing is made of a resin material. Also, the gear housing covers the opening of the yoke housing. Furthermore, the gear housing includes a worm housing segment and a wheel housing segment. The worm housing segment receives a worm shaft that is connected to the motor unit. The wheel housing segment receives a worm wheel that is meshed with the worm shaft. The worm shaft and the worm wheel cooperate together to transmit a rotational force of the motor unit to an output shaft connected to the worm wheel for outputting the rotational force from the geared motor. The geared motor further includes a reinforcing segment that is integrally formed with the worm housing segment in the gear housing. The reinforcing segment extends in a direction away from the yoke housing along the worm housing segment at least from a base end of the worm housing segment beyond an engaging point where the worm shaft is meshed with the worm wheel. The reinforcing segment includes an air passage that communicates an interior of the yoke housing to atmosphere.
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patent: 5216929 (1993-06-01), Ochiai et al.
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patent: 6242824 (2001-06-01), Torii et al.
patent: 6288464 (2001-09-01), Torii et al.
patent: 6382384 (2002-05-01), Torii et al.
patent: 6386056 (2002-05-01), Bachnak et al.
patent: 6390264 (2002-05-01), Torii et al.
patent: 6393929 (2002-05-01), Quere et al.
patent: 60-177651 (1985-11-01), None
patent: 2-53251 (1990-04-01), None
patent: 2-60460 (1990-05-01), None
patent: 7-298549 (1995-11-01), None
Torii Katsuhiko
Yamamoto Hiroaki
Asmo Co. Ltd.
Butler Douglas C.
Kramer Devon
Law Offices of David G. Posz
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