Motor-driven device having improved water-proofness

Details Motor-driven device having improved water-proofness Motor-driven device having improved water-proofness

1999-11-19

2001-03-06

Enad, Elvin (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S088000, C310S049540, C310S091000

Reexamination Certificate

active

06198189

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application relates to and incorporates herein by reference Japanese Patent Application No. 11-58833 filed on Mar. 5, 1999.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor-driven device for use in a motor-driven coolant pump device in a vehicle engine cooling system, and a motor-driven hydraulic pump device in a vehicle anti-lock braking system or the like.
2. Related Art
In a motor-driven coolant pump device used in a vehicle, as shown in
FIG. 5
for instance, a motor
51
is fixed to a pump
50
in a manner exposed externally from the pump
50
. Specifically, the motor
51
is fixed to a fixation surface
52
a
formed on a housing
52
of the pump
50
. Its output shaft
53
passes the housing
52
from the fixation surface
52
a
and protrudes into a pump chamber
54
. An impeller
55
is fixed to the output shaft
53
in the pump chamber
54
.
A casing
57
of the motor
51
has a bottomed cylindrical yoke
58
and an end plate
59
which closes an opening
58
a
of the yoke
58
. A bearing
60
which supports the output shaft
53
and a brush holder
61
are fitted in the end plate
59
.
An O-ring
63
is accommodated in a ring-shaped groove
62
formed on the end plate
59
of the motor
51
and press-fit to the fixation surface
52
a
so that external splash water may not enter the inside of the motor
51
and the pump chamber
54
. Further, an O-ring
66
is held in a stepped part
65
formed in an spigot-joint of the end plate
59
and abuts the inside surface of the yoke
58
so that the external splash water may not enter the inside of the motor
51
. Thus, the coolant pump device is constructed to be water-proof.
The end plate
59
is formed by die-cutting a metal plate in the similar manner as the yoke
58
is. Therefore, its dimensional accuracy is not high enough. However, the end plate
59
is required to have a high dimensional accuracy, because the groove
63
or the stepped part
65
requires a high dimensional accuracy for the O-rings
63
and
66
to provide a high sealing performance.
In another motor
69
which requires no O-rings for restricting the splash water from entering, a seal member
68
is fixed to the outer surface of an end plate
67
as shown in FIG.
6
. The seal member
68
is constructed from a stack of steel plates each of which is covered with a synthetic resin film
68
a
. The seal member
68
is pressed to the fixation surface
52
a
to restrict the splash water from entering the pump chamber
54
. Further, a liquid sealant is pasted at the joined surfaces between en end plate
67
and the yoke
58
at the time of assembling to restrict the splash water from entering the inside of the motor
69
. The end plate
59
is not required to have a high dimensional accuracy in the motor
69
.
However, the accuracy of fixing the motor
69
to the housing
52
in a direction of the output shaft
53
is lessened depending on variations of the synthetic resin film
68
a
covering the seal member
68
, because the motor
69
is fixed to the housing
52
via the seal member
68
. The accuracy of assembling the motor
69
in the direction of the output shaft
54
also is lessened, because the liquid sealant is pasted between the end plate
67
and the flange of the yoke
58
to seal the inside of the a casing
70
.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to improve a water-proofness of a motor-driven device with a simple construction.
It is another object of the present invention to provide a water-proofness without an end plate which has a high dimensional accuracy.
It is a further object of the present invention to provide a sealing construction without lessening an accuracy of fixing and assembling of a motor.
According to a motor-driven device of the present invention, a yoke of an electrical motor has a flange at a side of its opening. An end plate sized smaller than the flange is formed with tongues so that the end plate is press-fit in position in the yoke through the tongues. An annular elastic packing is disposed around an annular ring part of the end plate so that the packing encircles the end plate when the flange of the yoke is fixed to a housing of a pump. The packing fluid-tightly seals the inside of the yoke from an outside.


REFERENCES:
patent: 5243245 (1993-09-01), Oba
patent: 5391837 (1995-02-01), Carey
patent: 5763974 (1998-06-01), Vacca
patent: 5949173 (1999-09-01), Wille et al.

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