JP2003106330A - Bearing unit and geared motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a geared motor capable of preventing inferior operation of a rotary shaft and abnormal noises. SOLUTION: The bearing unit 1 is comprised of a bearing 24 supporting a rotary shaft 13, a receiving member 23 slidably touched with a friction plate 13a of the rotary shaft 13, and a retaining member 25 retaining the receiving member 23. A clearance 26 is arranged at an opposite side of the receiving member 23 of the retaining member 25, and synthetic resin 27 is filled into the clearance 26. A projected portion 32 extended to an opposite side of the receiving member 23 is formed on the retaining member 25 at a central axis L1 of the rotary shaft 13, and an end portion 32a of the projected portion 32 and an inner face 26a of the clearance 26 are separated from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device and a geared motor, and more particularly to a bearing device and a geared motor capable of adjusting the thrust of a rotary shaft by molding using a synthetic resin.

[0002]

2. Description of the Related Art Conventionally, a drive source for a power window device for raising and lowering a window mounted on an automobile is
Since it is necessary to sufficiently reduce the rotation of the rotary shaft that moves up and down the window, a geared motor in which a worm and a worm wheel are arranged in the motor is generally used.

That is, in this geared motor, a worm is arranged on the rotating shaft of the motor, and the rotation of the motor is reduced by using a worm wheel having a diameter larger than that of the worm.
It is configured to drive a driven mechanism of the power window device.

In the geared motor configured as described above, if the clearance between the end surface of the rotary shaft of the motor and the receiving portion of the bearing device in the thrust direction is large, an abnormal noise is generated due to the collision between the end surface of the rotating shaft and the receiving portion. Occasionally, a problem occurs.

Therefore, in order to suppress the rattling of the rotary shaft of the motor in the thrust direction and suppress the generation of abnormal noise, it is necessary to adjust the thrust of the rotary shaft in the bearing device.

FIG. 6 shows an enlarged view of a main part of a bearing device in the prior art. The same members as those of the motor according to the embodiment of the present invention described later are denoted by the same reference numerals. Further, for ease of understanding, the rotary shaft 13 is shown without using a sectional view.

The conventional bearing device 101 includes a bearing 24, a metal disk-shaped metal plate 23, and a holding member 12 made of a heat insulating resin.
It is composed of 5.

The bearing 24 is configured to support one end side of the rotary shaft 13. At this time, the rotating shaft 13 is optimally positioned in the thrust direction in the unloaded state. A friction plate 13a is arranged on the end surface of the rotary shaft 13.

The metal plate 23 is held on the rotary shaft 13 side of the holding member 125 so as to face the friction plate 13a.

A gap 126 is provided on the opposite side of the holding member 125 from the metal plate 23. This void 126
A hole portion 128 is provided in the hole to be inserted into the outside in a direction perpendicular to the rotation shaft 13.

The void 126 is filled with a thermoplastic synthetic resin 127. This synthetic resin 127
It is injected into the void 126 from the hole 128, and is cooled and solidified while being filled in the void 126.

Further, the holding member 125 is rotated by the filling pressure of the synthetic resin 127 when it is injected into the space 126.
The bearing device 1 is optimally thrust-adjusted by being pushed toward the 3 side.

That is, the metal plate 23 held by the holding member 125 is the friction plate 1 disposed on one end side of the rotary shaft 13.
3a and the optimally set clearance C3 are maintained.

[0014]

However, in a power window device for an automobile using a geared motor having a bearing device having the above-mentioned structure, when the window portion is moved, the axial direction of the rotating shaft of the motor, that is, the thrust. The load is applied in the direction, and the rotating shaft provided with the worm is moved toward the tip end side in the thrust direction.

That is, to explain using the bearing device 101 shown in FIG. 6, the rotary shaft 13 moves in the direction A parallel to the thrust direction. And the rotary shaft 13 is A
By moving in the direction, the friction plate 13 a arranged on one end side of the rotating shaft 13 comes into pressure-sliding contact with the metal plate 23.

As described above, when the motor is continuously operated in a state where the operating load on the motor is high, that is, the friction plate 13a is in pressure-sliding contact with the metal plate 23, friction between the friction plate 13a and the metal plate 23 is caused by friction. The metal plate 23 generates heat.

Here, as described above, the holding member 125 is made of a heat insulating resin, but when the temperature of the metal plate 23 continues to be high, this heat is generated by the holding member 125 and the bearing device 1.
In some cases, it was transmitted to the synthetic resin 127 through the outer wall portion of No. 01.

As described above, when heat is transferred to the synthetic resin 127, the synthetic resin 127 may be melted and may be eluted to the rotary shaft 13 and the bearing 24.

When the eluted synthetic resin 127 adheres to the rotary shaft 13 and the bearing 24 and cools, it adheres to the rotary shaft 13 and the bearing 24, causing malfunction of the motor and noise. There was a problem that

Further, when the synthetic resin 127 is eluted, the rattling of the rotary shaft 13 in the thrust direction becomes large, and as described above, there is a problem that abnormal noise and smooth reverse activation are hindered.

The present invention has been made in view of the above problems, and provides a bearing device capable of suppressing the rattling of the rotary shaft in the thrust direction to a minimum even if the synthetic resin is eluted. Especially.

Another object of the present invention is to prevent the eluted synthetic resin from sticking to the rotary shaft and bearing even if the synthetic resin is eluted in the bearing device, thereby preventing malfunction of the rotary shaft and abnormal noise. It is to provide a geared motor that can do.

[0023]

In order to solve the above problems, the invention according to claim 1 is a bearing for supporting a rotating shaft, and a receiving member configured to be in sliding contact with an end surface of the rotating shaft. And a holding member for holding the receiving member, wherein a void is provided on the opposite side of the holding member to the receiving member, and the void is filled with a synthetic resin, On the holding member, a convex portion that extends on the opposite side of the receiving member on the central axis of the rotating shaft is formed, and the end portion of the convex portion and the inner surface of the gap are separated from each other.

The invention described in claim 2 is the same as claim 1
The bearing device according to claim 1, wherein the holding member is provided with a reinforcing member for reinforcing the convex portion.

The invention described in claim 3 is the same as claim 1
In the bearing device according to the item (1), a groove is formed on the outer peripheral surface of the holding member along the rotation direction of the rotating shaft.

In order to solve the above problems, the invention according to claim 4 is to provide a bearing for supporting the rotating shaft, a receiving member configured to be in sliding contact with the end surface of the rotating shaft, and a holding member for holding the receiving member. A geared motor including a bearing device having a member, a worm disposed on a rotary shaft, and a worm wheel into which the worm is fitted, the bearing device comprising:
A gap is provided on the opposite side of the receiving member of the holding member, and the void is filled with a synthetic resin, and the holding member is formed with a convex portion that extends on the opposite side of the receiving member on the central axis of the rotating shaft. The end of the protrusion is separated from the inner surface of the void.

The invention described in claim 5 is the same as claim 4
The geared motor according to, wherein the holding member,
A reinforcing member is provided to reinforce the convex portion.

The invention according to claim 6 is the same as claim 4
The geared motor according to, wherein the holding member,
An outer peripheral surface is formed in close contact with the inner peripheral surface of the bearing device, and a groove is formed on the outer peripheral surface along the rotation direction of the rotary shaft.

[0029]

Therefore, according to the first aspect of the invention, the holding member is provided with a gap on the side opposite to the receiving member, the gap is filled with the synthetic resin, and the holding member is provided with the rotary shaft. On the central axis, a convex portion that extends to the opposite side of the receiving member is formed, and since the end of the convex portion and the inner surface of the void are separated from each other, even if the synthetic resin is eluted, the convex portion It is possible to minimize the rattling of the rotary shaft in the thrust direction by bringing the end portion into contact with the inner surface of the gap.

According to the second aspect of the invention, since the holding member is provided with the reinforcing member for reinforcing the convex portion, the end portion of the convex portion abuts on the inner surface of the void. The convex portion will not buckle even if a stronger thrust force is applied in the state where it is present. Further, by disposing the reinforcing member, it is possible to increase the frictional resistance between the holding member and the synthetic resin in the circumferential direction. Therefore, since the holding member does not rotate due to the one end side of the rotating shaft being pressed and slidably contacted with the receiving member, the elution of the synthetic resin is suppressed to the minimum, and the thrust of the rotating shaft in the thrust direction is suppressed. It is possible to suppress the rattling to a minimum.

Further, according to the third aspect of the present invention, since the groove portion is formed on the outer peripheral surface of the holding member along the rotation direction of the rotating shaft, the eluted synthetic resin is retained in the groove portion. You can Therefore, even if the synthetic resin is eluted, the eluted synthetic resin does not adhere to the rotating shaft and the bearing, so that malfunction of the rotating shaft and abnormal noise can be prevented.

According to the invention described in claim 4, in the bearing device, a gap is provided on the side of the holding member opposite to the receiving member, the gap is filled with a synthetic resin, and the holding member is On the central axis of the rotating shaft, a convex portion that extends to the opposite side of the receiving member is formed, and since the end of the convex portion and the inner surface of the gap are separated, even if the synthetic resin is eluted, the convex portion It is possible to minimize the rattling of the rotary shaft in the thrust direction by bringing the end portion into contact with the inner surface of the gap.

Further, according to the invention of claim 5, since the holding member is provided with the reinforcing member for reinforcing the convex portion, the end portion of the convex portion abuts on the inner surface of the gap. The convex portion will not buckle even if a stronger thrust force is applied in the state where it is present. Further, by disposing the reinforcing member, it is possible to increase the frictional resistance between the holding member and the synthetic resin in the circumferential direction. Therefore, it is possible to prevent the holding member from rotating due to the one end side of the rotating shaft being pressed and slidably contacted with the receiving member, and it is possible to suppress the elution of the synthetic resin to a minimum. It is possible to minimize rattling in the direction.

According to the sixth aspect of the invention, the holding member is formed with an outer peripheral surface which is in close contact with the inner peripheral surface of the bearing device, and the outer peripheral surface is formed along the rotation direction of the rotary shaft. Since the groove is formed, the eluted synthetic resin can be retained in the groove. Therefore, even if the synthetic resin is eluted, the eluted synthetic resin does not adhere to the rotating shaft and the bearing, so that malfunction of the rotating shaft and abnormal noise can be prevented.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, etc. described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

FIG. 1 is an enlarged sectional view of a bearing device according to an embodiment of the present invention. FIG. 2 is an overall view of a geared motor according to an embodiment of the present invention. FIG. 3 is a perspective view of a holding member according to an embodiment of the present invention. Figure 4
FIG. 6 is a perspective view showing a first modified example of the holding member according to the embodiment of the present invention. FIG. 5 is a perspective view showing a second modified example of the holding member according to the embodiment of the present invention. Note that, as described above, the rotating shaft 13 is shown without using a sectional view for easy understanding.

First, the overall structure of the geared motor 21 according to the embodiment of the present invention will be described.

As shown in FIG. 2, a geared motor 21 according to one embodiment of the present invention is used as a drive source for a power window device for raising and lowering a window mounted on an automobile, for example. .

The geared motor 21 comprises a yoke housing 2, a gear housing 3, an armature 11, a worm wheel 17, a bearing device 1 and the like.

The yoke housing 2 is composed of a bottomed cylindrical body made of a non-magnetic metal material such as aluminum. A bearing 14 is arranged on the bottom side of the yoke housing 2.

Inside the base of the yoke housing 2, a stator 4 made of a magnet is arranged. Also,
A brush 5 is arranged on the opening side of the yoke housing 2. Further, the armature 11 is housed inside the stator 4 of the yoke housing 2.

The armature 11 has a rotary shaft 13. A commutator 15 is arranged at the center of the rotary shaft 13. The winding 12 wound around the core is arranged on the side of the rotary shaft 13 that accommodates the yoke housing 2. A worm 16 is arranged at the end of the rotary shaft 13 on the gear housing 3 side.

The gear housing 3 is composed of a metal housing. The gear housing 3 is continuously provided on the opening side of the yoke housing 2. A worm wheel 17 is housed in the housing body of the gear housing 3.

The output shaft 6 is fixed to the center of the worm wheel 17. The worm wheel 17 is configured to be rotatable with the output shaft 6. Also, the output shaft 6
Are configured to penetrate through the gear housing 3 and project to the upper surface side of the gear housing 3.

A driven mechanism for raising and lowering a window (not shown) is connected to the output shaft 6. The worm wheel 17 is meshed with the worm 16. A bearing device 1 is formed on the end side of the gear housing 3 so as to be integrated with the gear housing 3.

In the geared motor 21 according to the embodiment of the present invention, a predetermined electric power is supplied to the winding 12 from the brush 5 slidingly contacted with the commutator 15, and the magnetic field generated in the winding 12 and the stator. The armature 11 can be rotated by the field with the armature 4.

Further, the worm 16 rotates with the rotation of the armature 11, and the rotation of the worm 16 causes the output shaft 6 to rotate together with the worm wheel 17. By rotating the output shaft 6 in this manner, a driven mechanism for a window (not shown) can be operated.

Next, the structure of the bearing device 1 used in the geared motor 21 according to the embodiment of the present invention will be described.

As shown in FIG. 1, the bearing device 1 includes a bearing 1
4 and a metal plate 23 made of a metal disk as a receiving member
And a holding member 25 made of a heat insulating resin.

A general slide bearing or the like is used as the bearing 14, and the rotating shaft 13 is supported by the bearing 14. Further, the rotating shaft 13 is optimally positioned in the thrust direction in the unloaded state. This rotating shaft 13
A friction plate 13a is disposed on the surface on one end side of the.

The metal plate 23 is held on the rotary shaft 13 side of the holding member 25 so as to face the friction plate 13a.

Further, as shown in FIGS. 1 and 3, the holding member 2
5 has a substantially disk-shaped main body 34.
Then, in the body portion 34, the central axis L1 of the rotary shaft 13 is
A convex portion 32 that is parallel to and extends on the opposite side of the metal plate 23 is formed.

Further, a plurality of reinforcing members 29 are provided around the convex portion 32. The reinforcing member 29 has a triangular cross section, and is arranged so as to connect the peripheral surface of the convex portion 32 and the end surface of the main body portion 34.

Further, the holding member 25 is formed with an outer peripheral surface 25a which is in close contact with the inner peripheral surface 1a of the bearing device 1. The outer peripheral surface 25a has a groove 33 along the rotational direction of the rotary shaft 13.
Are formed.

Further, as shown in FIG. 1, a gap 26 is provided on the opposite side of the holding member 25 from the metal plate 23.
The void 26 is provided with a hole 28 that is inserted in the direction perpendicular to the rotary shaft 13 to the outside.

The void 26 is filled with a thermoplastic synthetic resin 27. This synthetic resin 27 has holes 2
It is injected into the space 26 from 8 and is cooled and solidified in a state of being filled in the space 26.

The bearing member 1 is optimally thrust-adjusted by the holding member 25 being pushed toward the rotary shaft 13 by the filling pressure of the synthetic resin 27 when it is injected into the space 26.

That is, the metal plate 23 held by the holding member 125 is the friction plate 1 disposed on one end side of the rotary shaft 13.
3a and the optimally set clearance C1 are maintained and fixed. In addition, the end portion 32 a of the convex portion 32 has a space 26
The inner surface 26a is separated from the inner surface 26a with an optimally set clearance C2.

The structure of the bearing device 1 according to the embodiment of the present invention is as described above. Next, operations of the geared motor 21 and the bearing device 1 according to the embodiment of the present invention will be described.

The case where the geared motor 21 using the bearing device 1 according to the embodiment of the present invention is used in a power window device for an automobile (not shown) will be described below. Here, a driven mechanism for raising and lowering a window (not shown) is connected to the output shaft 6 shown in FIG.

As described above, since the bearing device 1 is optimally thrust-adjusted when the rotary shaft 13 is stopped, the friction plate 13a and the metal plate 23 of the rotary shaft 13 maintain the optimally set clearance C1. Is in a state.

However, when the above-mentioned window portion (not shown) is moved, the rotating shaft 13 shown in FIG. 1 moves while receiving a load in the A direction while rotating.

When the rotating shaft 13 rotates and moves in the direction A, the friction plate 13a and the metal plate 23 come into sliding contact with each other.

Further, when an impact force in the direction opposite to the moving direction is applied to the window portion of the automobile (not shown), the rotating shaft 13
Further, a large impact force is applied in the A direction. Therefore,
The rotating shaft 13 largely moves in the A direction.

In this way, the operating load is high and the rotary shaft 13
Is greatly moved in the direction A, the friction plate 13a is strongly pressed and slidably contacted with the metal plate 23. And the friction plate 13a
Is pressed against the metal plate 23, the rotary shaft 13
Continuing to rotate, the metal plate 23 generates heat due to the friction between the friction plate 13a and the metal plate 23.

Here, as described above, the holding member 25 is made of a heat insulating resin, but when the temperature of the metal plate 23 remains high, this heat is generated by the holding member 25 and the outer wall of the bearing device 1. It is transmitted to the synthetic resin 27 through the portion.

As described above, when heat is transferred to the synthetic resin 27, the synthetic resin 27 melts and elutes toward the rotary shaft 13 and the bearing 24.

However, the end 32a of the convex portion 32 and the gap 26 are
The inner surface 26a of the
Therefore, even if the synthetic resin 27 is eluted, the holding member 25 moves in the A direction only by the clearance C2. Therefore, rattling of the rotating shaft 13 in the thrust direction can be suppressed to a minimum.

Further, since the holding member 25 is provided with the reinforcing member 29 for reinforcing the convex portion 32, the convex portion 3
In the state where the second end portion 32a is in contact with the inner surface 26a of the space 26, the convex portion 32 does not buckle even if a stronger thrust force parallel to the A direction is applied.

By disposing the reinforcing member 29, the frictional resistance between the holding member 25 and the synthetic resin 27 in the circumferential direction can be increased. Therefore, the friction plate 1
It is possible to prevent the holding member 25 from rotating when the metal plate 23 is pressed and slidably contacted with the metal plate 23.
It is possible to suppress the elution of
The rattling of No. 3 in the thrust direction can be suppressed to a minimum.

Further, the holding member 25 is formed with an outer peripheral surface 25a in close contact with the inner peripheral surface 1a of the bearing device 1, and the outer peripheral surface 2
Since the groove portion 31 is formed in the 5a along the rotation direction of the rotating shaft 13, the eluted synthetic resin 27 can be retained in the groove portion 31.

Therefore, even if the synthetic resin 27 is eluted, the eluted synthetic resin 27 does not adhere to the rotary shaft 13 and the bearing 14, so that malfunction of the rotary shaft 13 and abnormal noise can be prevented.

As described above, according to this embodiment, the following effects can be obtained.

(A) A space 26 is provided on the opposite side of the holding member 25 from the metal plate 23.
7, the holding member 25 is provided with a convex portion 32 that extends to the opposite side of the metal plate 23 on the central axis L1 of the rotating shaft 13, and the end portion 32a of the convex portion 32 and the inner surface of the gap 26 are formed. 26a
Therefore, even if the synthetic resin 27 is eluted, the end portion 32a of the convex portion 32 is not separated from the inner surface 26a of the void 26.
It is possible to minimize the rattling of the rotary shaft 13 in the thrust direction by abutting against.

(B) Further, the holding member 25 has a convex portion 32.
Since the reinforcing member 29 for reinforcing the
Even if a strong thrust force is applied in a state where the end portion 32a of the convex portion 32 is in contact with the inner surface of the space 26, the convex portion 32 does not buckle. Further, by disposing the reinforcing member 29, the frictional resistance between the holding member 25 and the synthetic resin 27 in the circumferential direction can be increased. Therefore,
Since the holding member 25 can be prevented from rotating due to the friction plate 13a being pressed and slidably contacting the metal plate 23, the elution of the synthetic resin 27 can be suppressed to a minimum.
The rattling of the rotating shaft 13 in the thrust direction can be suppressed to a minimum.

(C) Further, the outer peripheral surface 25a of the holding member 25
Since the groove portion 33 is formed along the rotation direction of the rotating shaft 13, the eluted synthetic resin 27 can be retained in the groove portion 33. Therefore, even if the synthetic resin 27 is eluted, the eluted synthetic resin 27 does not adhere to the rotary shaft 13 and the bearing 24, so that malfunction of the rotary shaft 13 and abnormal noise can be prevented.

(D) Further, the bearing device 1 includes the holding member 2
5, a gap 26 is provided on the opposite side of the metal plate 23.
6 is filled with synthetic resin 27, and the holding member 25 is
On the central axis L1 of the rotary shaft 13, the convex portion 32 extending to the opposite side of the metal plate 23 is formed, and the end portion 32a of the convex portion 32 and the inner surface 26a of the gap 26 are separated from each other. Two
Even if 7 elutes, the end portion 32a of the convex portion 32 abuts on the inner surface 26a of the space 26, so that the rattling of the rotating shaft 13 in the thrust direction can be suppressed to a minimum.

(E) Further, the holding member 25 has a convex portion 32.
Since the reinforcing member 29 for reinforcing the
Even if a strong thrust force is applied in a state where the end portion 32a of the convex portion 32 is in contact with the inner surface of the space 26, the convex portion 32 does not buckle. Further, by disposing the reinforcing member 29, the frictional resistance between the holding member 25 and the synthetic resin 27 in the circumferential direction can be increased. Therefore,
Since the holding member 25 does not rotate due to the friction plate 13a being pressed and slidably contacting the metal plate 23, the elution of the synthetic resin 27 is suppressed to the minimum, and the rotating shaft 13 in the thrust direction is suppressed. Rattling can be suppressed to a minimum.

(F) Further, the holding member 25 is formed with an outer peripheral surface 25a in close contact with the inner peripheral surface 1a of the bearing device 1, and the outer peripheral surface 25a has a groove portion 3 along the rotational direction of the rotary shaft 13.
Since 3 is formed, the eluted synthetic resin 27 can be retained in the groove 33. Therefore, the synthetic resin 27
Since the dissolved synthetic resin 27 does not adhere to the rotary shaft 13 and the bearing 24 even if the liquid is dissolved, malfunction of the rotary shaft 13 and abnormal noise can be prevented.

The embodiment of the present invention can be modified as follows. Hereinafter, modified examples of the embodiment of the present invention will be described together with their actions with reference to FIGS.

(1) As shown in FIG. 4, the convex portion 32 provided on the holding member 25 may be a polygonal prism. In this way, when the convex portion 32 is formed of a polygonal prism, the end portion 32a of the convex portion 32 has the inner surface 2 of the void 26 in FIG.
The convex portion 32 does not buckle even if a stronger thrust force is applied in the state of being in contact with 6a.

Further, by forming the convex portion 32 with a polygonal column, the holding member 25 and the synthetic resin 27 in the circumferential direction are formed.
The frictional resistance with can be increased. Therefore, the holding member 25 can be prevented from rotating, and the synthetic resin 2
Since the elution of 7 can be suppressed to a minimum, the rattling of the rotating shaft 13 in the thrust direction can be suppressed to a minimum.

(2) As shown in FIG. 5, a groove 31 may be formed in the convex portion 32 provided on the holding member 25. By thus forming the groove in the convex portion 32, the space between the groove portions 31 is formed in a rib shape extending in the thrust direction, so that the end portion 32a of the convex portion 32 is formed on the inner surface 26a of the void 26 in FIG. The convex portion 32 does not buckle even when a stronger thrust force is applied in the contact state.

By providing the groove 31 in the convex portion 32, the frictional resistance between the holding member 25 and the synthetic resin 27 in the circumferential direction can be increased. Therefore, the holding member 25 can be prevented from rotating, and the synthetic resin 27 can be prevented.
It is possible to suppress the elution of
The rattling of No. 3 in the thrust direction can be suppressed to a minimum.

(3) The hole 28 shown in FIG.
It is not limited to be perpendicular to the vertical direction of the bearing device 1 and vertically downward of the bearing device 1. That is, the synthetic resin 27 may be directed vertically above the bearing device 1 so as to prevent foreign matter from entering therein, or may be formed obliquely with respect to the rotary shaft 13. In addition, the synthetic resin 27 is filled with voids 26.
Hole 28 until the synthetic resin 27 is solidified.
It is desirable to arrange a shield member or the like at the entrance of the.

(4) In the bearing device 1 shown in FIG. 1, the friction plate 13a is not limited to being disposed on one end surface of the rotary shaft 13. That is, the friction plate 13a is
It may be arranged on the metal plate 23. In this case, the friction plate 13
a is disposed on the rotating shaft 13 side of the metal plate 23. The end surface of the friction plate 13a on the rotary shaft 13 side and the end surface of the rotary shaft 13 on the friction plate 13a side are fixed with a clearance C1.

(5) Further, the bearing device 1 of this embodiment shown in FIG. 1 can be used as follows. That is, when an impact force is applied in the direction opposite to the moving direction of the window (not shown), the impact force is applied in the A direction of the rotary shaft 13, the rotary shaft 13 is largely moved in the A direction, and the friction plate 13 a is moved to the metal plate 23. Pressed and slid. At this time, the braking force generated by the pressure sliding contact between the metal plate 23 and the friction plate 13a may be used to prevent the reverse rotation of the rotary shaft 13.

The technical ideas other than the claims that can be understood from the above-described embodiments will be described below along with their effects.

(A) The bearing device according to claim 1, wherein the convex portion is formed of a polygonal prism. (B) The geared motor according to claim 4, wherein the convex portion is formed of a polygonal column.

As described above, when the convex portion is formed of a polygonal prism, the convex portion is seated even when a stronger thrust force is applied in a state where the end portion of the convex portion is in contact with the inner surface of the gap. Never give in.

Further, by forming the convex portion with a polygonal prism, the frictional resistance between the holding member and the synthetic resin in the circumferential direction can be increased. Therefore, the holding member can be prevented from rotating and the elution of the synthetic resin can be suppressed to the minimum, so that the rattling of the rotating shaft in the thrust direction can be suppressed to the minimum.

(C) The bearing device according to claim 1, wherein a groove is formed in the protrusion. (D) The geared motor according to claim 4, wherein a groove is formed in the convex portion.

As described above, since the grooves are formed in the convex portions in this way, the groove portions are formed in a rib shape extending in the thrust direction, so that the end portions of the convex portions contact the inner surface of the void. The convex portion will not buckle even if a stronger thrust force is applied while it is on.

Further, by providing the groove on the convex portion, it is possible to increase the frictional resistance between the holding member and the synthetic resin in the circumferential direction. Therefore, the holding member can be prevented from rotating and the elution of the synthetic resin can be suppressed to the minimum, so that the rattling of the rotating shaft in the thrust direction can be suppressed to the minimum.

[0095]

As described in detail above, according to the present invention,
Even if the synthetic resin is eluted, rattling of the rotary shaft in the thrust direction can be suppressed to a minimum.

Further, even if the synthetic resin is eluted in the bearing device, it is possible to prevent the eluted synthetic resin from sticking to the rotary shaft and the bearing, thereby preventing malfunction of the rotary shaft and abnormal noise.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a bearing device according to an embodiment of the present invention.

FIG. 2 is an overall view of a geared motor according to an embodiment of the present invention.

FIG. 3 is a perspective view of a holding member according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a first modified example of the holding member according to the embodiment of the present invention.

FIG. 5 is a perspective view showing a second modified example of the holding member according to the embodiment of the present invention.

FIG. 6 is an enlarged cross-sectional view of a bearing device according to a conventional technique.

[Explanation of symbols]

1, 101 bearing device, 1a inner peripheral surface, 2 yoke housing, 3 gear housing, 4 stator, 5 brush, 6 output shaft, 11 armature, 12 winding, 13
Rotating shaft, 13a friction plate, 14, 24 bearing, 15
Commutator, 16 worm, 17 worm wheel, 21 geared motor, 23 metal plate, 25, 12
5 holding member, 25a outer peripheral surface, 26, 126 void,
26a inner surface, 27,127 synthetic resin, 28,128
Hole part, 29 reinforcing member, 31 groove part, 32 convex part, 3
2a End, 33 Groove, 34 Main body

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3J011 AA01 BA02 KA02 MA12                 3J012 AB02 AB07 BB01 BB02 CB03                       DB07 DB14 FB01                 3J017 AA05 DA01                 5H605 AA04 AA05 BB05 CC04 CC05                       EB12 EB28 EB36 FF06 GG07                 5H607 AA04 AA12 BB01 CC03 DD03                       EE36 GG03 GG09 GG29 JJ08

Claims (6)

[Claims] 1. A bearing device comprising: a bearing for supporting a rotating shaft; a receiving member configured to receive one end of the rotating shaft; and a holding member for holding the receiving member. A void is provided on the opposite side of the receiving member of the holding member, and the void is filled with a synthetic resin, and the holding member has a side opposite to the receiving member on the central axis of the rotating shaft. The bearing device is characterized in that a convex portion extending to the inside is formed, and an end portion of the convex portion and an inner surface of the gap are separated from each other. 2. The holding member is provided with a reinforcing member for reinforcing the convex portion.
Bearing device according to. 3. The bearing device according to claim 1, wherein a groove is formed on an outer peripheral surface of the holding member along a rotation direction of the rotating shaft. 4. A bearing device having a bearing for supporting a rotating shaft, a receiving member configured to receive one end of the rotating shaft, and a holding member for holding the receiving member, and a bearing device arranged on the rotating shaft. A geared motor comprising a worm provided and a worm wheel into which the worm is fitted, wherein the bearing device is provided with a gap on the side opposite to the receiving member of the holding member, and the gap is provided. Is filled with a synthetic resin, and the holding member is formed with a convex portion extending to the opposite side of the receiving member on the central axis of the rotating shaft, and the end portion of the convex portion and the gap are formed. Geared motor characterized by being separated from the inner surface. 5. The holding member is provided with a reinforcing member for reinforcing the convex portion.
Geared motor described in. 6. The holding member is formed with an outer peripheral surface in close contact with the inner peripheral surface of the bearing device, and a groove portion is formed on the outer peripheral surface along the rotation direction of the rotary shaft. The geared motor according to claim 4.