Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-02-04
2004-11-16
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06800R, C310S049540
Reexamination Certificate
active
06819019
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to the technical field of a motor with a rotation detecting device, which is used for electrical equipment mounted on a vehicle or the like.
2. Description of Related Art
Generally, in this type of motor, there is a rotation detecting device which detects the rotational amount of a rotary shaft of the motor for detecting the movement amount or the position of a movable member (actuator) acting on the basis of the driving of the motor. As such a motor, motors which are shown in JP-A-11-215773 and JP-A-11-215774 are proposed. In the case of these motors, as shown in FIG.
10
(A), an opening
22
a
is formed in the peripheral surface of the cylindrical part of a casing
22
where a reduction worm wheel and a rotary shaft worm forming part of the motor are contained. The structure is such that a rotation detecting device
24
is provided on the inside surface of a sensing unit
23
which is formed to close the above described opening
22
a
, and waterproofing of the rotation detecting device
24
or other members which are arranged in the interior of the casing
22
is achieved by putting a seal member between the peripheral part of the casing opening
22
a
and the sensing unit
23
to close the opening
22
a.
However, with such a structure as the above described conventional one, the sensing unit
23
in which the rotation detecting device
24
is provided is inserted from the outside of the opening
22
a
, formed in the peripheral part of the casing
22
, and is integrated by fixing means, such as, using screws
25
. Therefore, not only the screwing work becomes necessary making the work troublesome but also incurs a risk that the screw
25
is loosened by an external force as the fixing screw
25
is exposed to the outside of the motor. Additionally, the problem that the above described water proof structure must be provided at the boundary part between the casing
22
and the sensing unit
23
is created.
On the other hand, when providing a rotation detecting device, the electrical connection for feeding electricity to the rotation detecting device is necessary. In the case of the conventional one, as shown in
FIG. 10
(B), a lead wire
24
a
is pulled out of the rotation detecting device
24
and is integrated with a lead wire
26
which is separately pulled out for feeding a brush to form an extension harness
27
. At the end part of the extension harness
27
, a connecting male coupler
28
is provided, and to the male coupler
28
, a female coupler which is pulled out from the external power source on the vehicle body side or the like is connected. However, each extension harness
27
is required to have a different length depending on the position where the motor is provided. Therefore, it is necessary to prepare motors in which extension harnesses
27
of various kinds of specifications are provided. Additionally, there are such problems that the number of products becomes large making quality control troublesome, and causing a high cost.
Furthermore, in the case where such a motor is attached to the door of a vehicle or the like, horizontally mirror image casings
22
may be prepared, but the shape of the opening
22
a
formed in each casing
22
is not horizontally symmetrical. Therefore, there is a problem that a sensing unit
23
with a shape corresponding to each of these openings
22
a
must be prepared, which makes it difficult to use a common part. The problems to be solved by the invention exist in these points.
SUMMARY OF THE INVENTION
The invention is created in view of the situation, having an object of solving the problems discussed above, and it is a motor comprising a rotary shaft; a casing with a bottomed cylindrical part which rotatably contains the rotary shaft; and a rotation detecting device which detects the rotation of the rotary shaft, wherein the rotation detecting device is supported by a sensor holder, and the sensor holder is disposed in the casing by the incorporation(installation) from the incorporating direction to the cylindrical part of the rotary shaft. By doing so, the sensor holder is arranged to be housed in the casing, and it becomes unnecessary to provide a waterproof structure.
In this motor, it is possible that a holder receiving part is formed on the inner peripheral surface of the cylindrical part of the casing of the invention, and that a sensor holder is incorporated in the holder receiving part in a state of temporary holding, and a fixing means for the sensor holder, such as screws, becomes unnecessary.
Furthermore, in the motor, the sensor holder of the invention can be a holder, where a sensor support part in which the rotation detecting device is incorporated and a terminal support part in which a connecting terminal thereof is incorporated are formed, and a connecting opening part for seeing the terminal support part from the outside is formed in the outer peripheral surface of the cylindrical part of the casing.
Furthermore, in the motor, it is possible that, on the opening side of the cylindrical part of the casing of the invention, a brush unit in which a brush is incorporated is fixed, and that the sensor holder in the casing is positioned and supported by the casing on the basis of the fixing to the casing of the brush unit.
Furthermore, in the motor, the structure can be such that the brush connecting terminal incorporated in the brush unit of the invention extends onto the terminal support part of the sensor holder so as to be supported by the terminal support part, and to be seen from the connecting opening part of the casing.
Furthermore, in the motor, the connecting opening part of the casing of the invention can be a part where at least one projecting piece part which projects toward the outside diameter side is formed.
Furthermore, in the motor, an external pull-out terminal unit which is electrically connected to each of the connecting terminals of the rotation detecting device and the brush can be incorporated, in the connecting opening part of the invention, from the outside diameter side of the cylindrical part.
Furthermore, in the motor, the structure can be such that the terminal of the terminal support part of the invention is supported in the state of projecting in the outside diameter direction of the cylindrical part and, on the other hand, a support piece part, which supports the terminal support part of the sensor holder, is formed on the holder receiving part on the bottom side of the cylindrical part, and the incorporation load at the time of incorporating the external pull-out terminal unit to the terminal support part is received by the support piece part through the terminal support part. Thus, the incorporation load acting on the sensor holder to deform the sensor holder is avoided, and the accuracy of the rotation detection can be raised.
Furthermore, in the motor, the structure can be made such that to the external pull-out terminal unit of the invention, at least one engaging claw is formed on the incorporation tip side, and the engaging claw is engaged with the step-like engagement receiving part which is formed to the connecting opening part, when the external pull-out terminal unit is incorporated in the connecting opening part. By doing this, it becomes possible to set an engagement receiving part with which the engaging claw is engaged, without providing an opening which leads to the periphery of the projecting piece part, and the external pull-out terminal unit can be attached to the connecting opening part in a sealing state so that a water proof structure is provided, and the workability can be improved.
Furthermore, in this motor, the engagement receiving part of the invention is formed integrally when the cylindrical part is molded.
REFERENCES:
patent: 4982125 (1991-01-01), Shirakawa
patent: 5086243 (1992-02-01), Hofmann
patent: 5453649 (1995-09-01), Blanchet
patent: 5532533 (1996-07-01), Mizutani
patent: 6091171 (2000-07-01), Ohishi et al.
patent: 6107713 (2000-08-01), Hulsmann et al.
patent: 6127752 (
Abe Isao
Hagiwara Yuji
Tamura Masayuki
Le Dang
Mitsuba Corporation
Oliff & Berridg,e PLC
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