JP2002369447A - Motor and power window motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor and a power window motor which can prevent unwanted rotation of a turning shaft, and moreover can be driven smoothly. SOLUTION: In this power window motor 10, since a pressure-contact surface 56 of a pressure-contact member 50 to be placed in the pressure-contact with a braking surface 66 of a braking plate 64 is formed as a curved surface which is projected toward external side, if the axial direction of the pressure-contact member 50 is tilted together with a shaft 16, the angled part or the like of the pressure-contact member 50 will not be brought into contact with the braking surface 66 and only a small contact area is reduced for the braking surface 66. Therefore, even in a state of the axial direction of the pressure-contact member 50 being tilted, this power window motor 10 can be driven smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor for moving a driven object by its own rotating force and a power window motor for opening and closing a door glass.

[0002]

2. Description of the Related Art In recent years, a vehicle is equipped with a so-called power window device, and a door glass provided on a door panel of the vehicle can be moved up and down (open / close) by a driving force of a motor.

[0003] A motor applied to such a power window device, that is, a power window motor, includes a rotor provided with a winding, and a permanent magnet provided around the rotor. The rotor rotates by the rotational force generated by the interaction between the magnetic field formed by the electric current flowing through the wire and the magnetic field formed by the permanent magnet. A worm gear is coaxially and integrally attached to a shaft (rotating shaft) to which the rotor is coaxially and integrally attached, and the worm gear is rotated by rotation of the shaft accompanying rotation of the rotor, Further, the worm wheel meshing with the worm gear rotates.

[0004] An output shaft is coaxially and integrally attached to the worm wheel. Further, a support for directly or indirectly supporting the door glass is mechanically connected to the output shaft. For example, when the motor is driven to rotate forward, the support supports the door glass. When the motor is driven to rotate in the reverse direction, it falls while the supporter supports the door glass. The up and down movement of the support causes the door glass to open and close.

By the way, the weight of the door glass always acts on the support described above, whereby the door glass tries to rotate the worm wheel through the support in the rotation direction when the power window motor is driven in reverse. .

A gear train composed of a worm gear and a worm wheel can theoretically transmit the torque of the worm gear to the worm wheel to rotate the worm wheel. Can not be rotated. However, in reality, depending on the gear ratio and the like, it is possible to transmit the torque of the worm wheel to the worm gear to some extent to rotate the worm gear.

Accordingly, when the weight of the door glass as described above acts as a rotational force of the worm wheel, the worm gear meshing with the worm wheel may rotate, and as a result, the door glass may be lowered by its own weight. There was a possibility.

As one means for preventing such inadvertent lowering of the door glass, for example, there is a rotation restricting mechanism for restricting the rotation of the shaft by friction. Hereinafter, such a rotation restricting mechanism will be briefly described. explain.

As shown in FIG. 6, in a power window motor 150 to which a rotation restricting mechanism for restricting rotation of the shaft 152 by friction is applied, a fitting hole 154 coaxial with the shaft 152 is formed at an end of the shaft 152. A press-contact member 156 formed of a synthetic resin material is integrally fitted into the fitting hole 154. As shown in FIG. The press-contact member 156 has a substantially cylindrical fitting portion 1 that enters the fitting hole 154 in a state of being fitted into the fitting hole 154.
58 are formed. At one end in the axial direction of the fitting portion 158, a substantially disc-shaped press contact portion 1 is coaxial with the fitting portion 158.
60 are integrally formed.

On the other hand, as shown in FIG.
A flat braking plate 162 is arranged on one side in the axial direction of the shaft 152 so as to face the pressing member 156 along the axial direction of the shaft 52. The braking plate 162 is attached to a holder 166 integrally attached to the housing 164 within the housing 164 of the power window motor 150 by pressing one end surface in the thickness direction of the pressing portion 160.
Is fixed in a state of sliding contact with one end in the axial direction.

For example, when the worm wheel 170 attempts to rotate in the direction of arrow C in FIG. 6 due to the weight of the door glass (not shown), the teeth of the worm wheel 170 press the teeth of the worm gear 172. Basically, at this time, the pressing force F3 acting on the teeth of the worm gear 172 acts so as to rotate the worm gear 172, and the worm gear 172 also tries to be displaced to one end in the axial direction by the pressing force F3. Due to the displacement of the worm gear 172, the shaft 152 presses one axial end of the press contact portion 160 against one end face in the thickness direction of the brake plate 162.

As described above, even in the normal state, the press contact portion 16
0 is in contact with one end in the thickness direction of the braking plate 162, but the pressing force F3 acts on the one end in the axial direction of the pressing portion 160 and one end in the thickness direction of the braking plate 162. When the shaft 152 tries to rotate in this state, when the shaft 152 attempts to rotate, the axial end of the press contact portion 160, which is increased by the action of the pressing force F3, and one end in the thickness direction of the brake plate 162. Acts to prevent the rotation of the shaft 152,
This prevents inadvertent lowering of the door glass.

[0013]

As shown in FIGS. 6 and 8, since one end in the axial direction of the press contact portion 160 and one surface in the thickness direction of the brake plate 162 are both flat, FIG. As shown in FIG. 5, if the axial direction of the shaft 152 is inclined with respect to the normal axial direction due to the above-mentioned pressing force F3 acting, not the end face of the axial end of the press contact portion 160, A corner portion, which is a boundary between the end surface of one end in the axial direction of the press contact portion 160 and the outer peripheral portion, comes into contact with one surface in the thickness direction of the brake plate 162.

In this state, since the corners of the press contact portion 160 come into contact with the surface of the brake plate 162 so as to bite, the frictional resistance becomes unnecessarily large. For this reason, the torque required to rotate the shaft 152 when the power window motor 150 operates is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a motor and a power window motor which can prevent an inadvertent rotation of a rotating shaft and can drive smoothly.

[0016]

According to a first aspect of the present invention, there is provided a motor having a rotary shaft coaxially and integrally mounted with a rotor that rotates by an interaction between a magnetic field formed by itself and a magnetic field formed around the motor. A housing accommodating at least an axial end of the rotary shaft, and a housing provided along the axial direction of the rotary shaft facing the axial end of the rotary shaft and the housing of the rotary shaft. A braking member having a substantially flat braking surface facing the axial end portion, and at least a part of the facing surface facing the braking member is curved so as to protrude outward, and to the braking member. It is a pressure contact surface to be pressed,
A press-contact member integrally attached to one end of the rotating shaft in the axial direction.

In the motor having the above-described configuration, for example, in the case of a rotor having a winding, a magnetic field is formed around the rotor by energizing the winding, and the magnetic field formed by the rotor is, for example, The rotor rotates around its own axis through interaction with a magnetic field formed by a permanent magnet or the like provided around the rotor inside the housing, and is further coaxially and integrally attached to the rotor. The rotating shaft rotates.

The rotation of the rotating shaft is directly or indirectly transmitted to the output shaft via a gear train such as a worm gear, a worm wheel, a spur gear, or a belt transmitting mechanism such as a pulley and an endless belt. Further, for example, the rotation is transmitted to a driven shaft connected to a driven portion such as a door glass in a window regulator device of a vehicle or a sunroof in an automatic sunroof device.

On the other hand, in this motor, the pressure contact surface of the pressure contact member integrally provided at the axial end of the rotating shaft is in pressure contact with the braking surface of the braking member, and the rotational force generated by the interaction of the magnetic field described above. When an external rotational force different from the above is applied to the rotating shaft and the rotating shaft is inadvertently rotated, the rotation of the rotating shaft is regulated by friction between the braking surface of the braking member and the pressing surface of the pressing member. .

By the way, for example, the rotating shaft may be deflected due to the above-mentioned external rotating force or the like, and the rotating shaft may be inclined with respect to the normal axial direction.

However, in this motor, since the pressure contact surface of the pressure contact member is a curved surface that protrudes outward, even if the axial direction of the rotating shaft is inclined with respect to the normal axial direction. The contact area between the press contact surface and the braking surface does not change, or even if it does change, the amount of change is relatively small.

Thus, even when the axial direction of the rotary shaft is inclined with respect to the normal axial direction, the change in friction between the press contact surface and the braking surface is small, and the axial direction of the rotary shaft is normal. The torque required to release the lock of the rotating shaft due to friction in the state inclined with respect to the axial direction in the state can be made equivalent to that in the state in which the axial direction of the rotating shaft is normal.

According to a second aspect of the present invention, a magnetic field formed by a rotor coaxially and integrally attached to a rotating shaft and a magnetic field formed by magnetic field forming means provided around the rotor are mutually reciprocal. A power window motor that rotates the rotor by an action and opens and closes a door glass provided on a door panel of a vehicle by a rotating force of the rotor, and a worm gear provided coaxially and integrally with the rotation shaft. A worm wheel mechanically connected to supporting means for supporting the door glass so that the door glass can be opened and closed, meshing with the worm gear, and transmitting the rotating force of the rotating shaft received via the worm gear to the supporting means; And a housing for accommodating at least the axial end of the rotary shaft, and provided in the housing along the axial direction of the rotary shaft so as to face the axial end of the rotary shaft. A braking member that opposing surfaces of said axial end of said rotary shaft is a braking surface of the substantially planar with the,
At least a part of the surface facing the braking member is curved so as to protrude outward, and is a braking surface that is pressed against the braking member, and is integrally formed with one end of the rotating shaft in the axial direction. And a pressure contact member to be attached.

In the power window motor having the above structure,
For example, in the case of a rotor provided with a winding, a magnetic field is formed around the rotor by energization of the winding, and the magnetic field formed by the rotor and, for example, around the rotor inside the housing. The rotor rotates around its own axis due to the interaction with the magnetic field formed by the provided permanent magnets and the like, and further, the rotation shaft coaxially and integrally attached to the rotor rotates.

When the rotating shaft rotates, the worm gear coaxially and integrally attached to the rotating shaft rotates,
Further, the worm wheel meshing with the worm gear rotates.

The rotation of the worm wheel is transmitted to the support means for supporting the door glass, and the support means moves while supporting the door glass. Thereby, the door glass is opened and closed.

On the other hand, in the present power window motor, the pressure contact surface of the pressure contact member integrally provided at the axial end of the rotary shaft is in pressure contact with the braking surface of the braking member. When the worm wheel tries to rotate the closed door glass due to an external force different from the rotational force of the power window motor, the worm gear teeth are pressed against the worm wheel teeth, and the worm gear is generally moved by the pressing force at this time. Attempts to displace in its own axial direction. As a result, the rotating shaft integral with the worm gear is displaced in the axial direction and presses the pressing surface of the pressing member against the braking surface of the braking member (in a normal state, when the pressing surface and the braking surface are pressed against each other, Pressure with a larger force than usual). At this time, the rotation of the rotating shaft is regulated by the friction between the pressing surface of the pressing member and the braking surface of the braking member.

By the way, for example, the rotating shaft may bend due to the above-mentioned external force or the like, and the rotating shaft may be inclined with respect to the normal axial direction.

However, in this power window motor, since the pressure contact surface of the pressure contact member is a curved surface protruding outward, it is assumed that the axial direction of the rotating shaft is inclined with respect to the normal axial direction. However, the contact area between the press contact surface and the braking surface does not change, or even if it does, the amount of change is small.

Thus, even when the axial direction of the rotating shaft is inclined with respect to the normal axial direction, the change in friction between the press contact surface and the braking surface is small, and the axial direction of the rotating shaft is normal. The torque required to release the lock of the rotating shaft due to friction in the state inclined with respect to the axial direction in the state can be made equivalent to that in the state in which the axial direction of the rotating shaft is normal.

[0031]

FIG. 4 is a plan sectional view of a power window motor 10 as a motor according to an embodiment of the present invention. As shown in FIG. 1, the power window motor 10 includes a housing 12.

The housing 12 has a yoke 14 formed of a magnetic material such as metal into a substantially cylindrical shape with a bottom. Inside the yoke 14, a part of a shaft 16 as a rotation shaft is accommodated. The shaft 16 is rotatably supported by a bearing 18 provided at the bottom of the yoke 14.

A rotor 20 with a winding (not shown) is accommodated inside the yoke 14. The rotor 20 is coaxially and integrally attached to the shaft 16, and when a rotational force acts on the rotor 20, the shaft 16 rotates integrally with the rotor 20.

Further, a plurality of permanent magnets 22 are attached to the inner periphery of the yoke 14 as magnetic field forming means. These permanent magnets 22 are provided so as to face the rotor 20 along the rotational radius direction of the shaft 16,
Rotational force acts on the rotor 20 due to the interaction between the magnetic field formed when the winding applied to the rotor 20 is energized and the magnetic field formed by the permanent magnet 22. The yoke 14 to which the permanent magnet 22 is attached is connected to the permanent magnet 22 and the rotor 20.
And the like, and serves as a magnetic path of lines of magnetic force forming a magnetic field formed by the permanent magnet 22.

A commutator 24 is provided on the side of the rotor 20. The commutator 24 includes the rotor 2 described above.
0 windings are mechanically and electrically connected. Further, a brush 26 is provided on the side of the commutator 24 along the radial direction of rotation of the shaft 16 so as to be able to slide on the commutator 24. The brush 26 is directly or indirectly connected to a battery (not shown) mounted on the vehicle.
When the brush 26 slides on the commutator 24, the winding of the rotor 20 is energized via the brush 26 and the commutator 24.

On the other hand, a gear box 28 which forms the housing 12 together with the yoke 14 is provided on the opposite side of the rotor 20 via the commutator 24. Gear box 28
A gear box body 30 having a shallow bottom opening toward one side in the radial direction of rotation of the shaft 16;
The gear box 28 closes an open end of the yoke 14.

The other end of the shaft 16 in the axial direction is
The worm gear 34 extends to the inside of the gear box 28, and a worm gear 34 is coaxially and integrally attached to the shaft 16 inside the gear box 28.

As shown in FIGS. 1 and 4, a worm wheel 36 is housed inside the gear box 28. The worm wheel 36 has its axial direction set to the opening direction of the gear box main body 30 and the opposite direction, and one end in the axial direction is rotatably supported by a bearing (not shown) provided at the bottom of the gear box main body 30. The other end in the axial direction is rotatably supported by the lid 32.

The other end of the worm wheel 36 in the axial direction (more precisely, a shaft formed coaxially and integrally with the main body of the worm wheel 36) passes through the lid 32 (see FIG. 4). It protrudes outside the gear box 28.

A portion of the worm wheel 36 protruding outside the gear box 28 is provided on a support 42 as a support means provided inside the door panel 40 of the vehicle (that is, between the inner panel and the outer panel constituting the door panel 40). (See FIG. 5). The support 42 supports the door glass 44, and the support 42 moves the door panel 40 according to the rotation of the worm wheel 36.
By moving up and down inside the door, the door glass 44 moves up and down to open and close the upper part of the door panel 40.

As shown in FIG. 1, the worm wheel 36 meshes with the worm gear 34,
The rotation of the worm gear 34 is transmitted to the worm wheel 36.

On the other hand, as shown in FIGS. 1 and 4, a bearing 46 is provided on the opposite side of the commutator 24 via the worm gear 34, that is, on the other axial end of the shaft 16 with respect to the worm gear 34. The shaft 16 is rotatably supported together with the bearing 18.

As shown in FIGS. 1 and 3, a bottomed insertion hole 48 is formed substantially coaxially with the shaft 16 at the other axial end of the shaft 16.
Pressure contact member 5 formed of a polyimide synthetic resin material
0 is inserted. As shown in FIG. 3, the press-contact member 50 includes a substantially cylindrical fitting portion 52. As shown in FIG. 1, the fitting portion 52 is press-fitted into the fitting hole 48 and integrated with the shaft 16. Are linked together.

At the other end of the fitting portion 52 in the axial direction, a press contact portion 54 having a larger diameter than the fitting portion 52 is formed coaxially with the fitting portion 52. The press-contact portion 54 is generally disk-shaped, but the outer peripheral portion gradually decreases in outer diameter toward the other end in the axial direction (that is, the side opposite to the fitting portion 52),
It has a curved shape (that is, it is not a concave shape even if it is curved) so that its cross-sectional shape is overhanging, and this curved portion is a pressure contact surface 56.

Further, as shown in FIG. 3, a bottomed circular hole 58 opened toward the other side in the axial direction is formed in the press contact portion 54 so as to be coaxial with the fitting portion 52 and the press contact portion 54. The braking member 60 which will be described next
The contact area of the braking plate 64 with the braking surface 66 is set to a predetermined size.

As shown in FIG. 1, a braking member 60 is provided inside the gear box 28 so as to face the pressure contact member 50 along the axial direction of the shaft 16. The braking member 60 has a holder 62.

The holder 62 is formed in a shallow bottom box shape opened toward the pressure contact member 50 side, engages with a predetermined portion of the gear box main body 30, and is substantially integrally connected to the gear box main body 30. I have. A brake plate 64 is mounted inside the holder 62. Braking plate 64
Is formed of metal or the like, and one end surface in the thickness direction is a braking surface 66 so that a part of the pressing surface 56 of the pressing member 50 is in contact with the worm gear 3.
4 is slightly separated from the worm wheel 36 by a distance sufficiently shorter than the backlash.

<Setting of Curvature of Press-Contact Portion 54> As described above, in the present power window motor 10, the press-contact surface 56 is curved so as to project at a predetermined curvature. An example of a method for setting the radius of curvature and the center of curvature of the press contact surface 56 will be briefly described.

If the pressure contact surface 56 is not curved but is basically a flat surface like the pressure contact portion 160 described in the related art, when the shaft 16 is inclined relative to the worm wheel 36 side. The length along the axial direction of the shaft 16 from the contact portion between the shaft 16 and the bearing portion 46 to the press contact surface 56 is the radius of curvature of the press contact surface 56.

In the cross section of the shaft 16 and the press-contact member 50 including the contact portion between the shaft 16 and the bearing portion 46, the shaft 16 extends along the inner diameter direction of the circular hole 58 in the inner peripheral portion of the circular hole 58. A virtual line extending toward the worm wheel 36 along the axial direction of the shaft 16 from the portion on the contact site side between the shaft 16 and the bearing portion 46;
The intersection with the imaginary line extending toward the center in the radial direction of the shaft 16 from the contact portion with the shaft 6 is the curvature center position.

It should be noted that the radius of curvature and the center of curvature obtained by the above-described setting method are merely guidelines, and the radius of curvature and the center of curvature may be obtained by a method other than this method.

<Operation and Effect of the Embodiment> Next, the operation and effect of the embodiment will be described.

In the power window motor 10, when the brush 26 slides on the commutator 24, power from the battery is supplied to the rotor 20, and a current flows through the winding of the rotor 20, the periphery of the rotor 20 The rotor 20 rotates around its own axis due to the interaction between the magnetic field formed by the windings of the rotor 20 and the magnetic field formed by the permanent magnets 22.

The rotation of the rotor 20 causes the shaft 16 to which the rotor 20 is coaxially and integrally mounted.
Rotates, and the worm gear 34 coaxially and integrally attached to the shaft 16 like the rotor 20 rotates. The rotation of the worm gear 34 is transmitted while being reduced to a worm wheel 36 meshing with the worm gear 34, and the rotational force of the worm wheel 36 is
To the support 42 so that the door glass 44
Ascend and descend while supporting. In this manner, the rotational force of the rotor 20 is transmitted to the worm wheel 36 and the support 42 moves up and down, so that the upper part of the door panel 40
It is opened and closed by 4.

By the way, the weight of the door glass 44 always acts on the support 42 described above, and the weight of the door glass 44 is caused by the power window motor 10 to lower the door glass 44 via the support 42. The worm wheel 36 is to be rotated in the direction of arrow A in FIG. Furthermore, this door glass 44
The rotational force of the worm wheel 36 due to its own weight is transmitted to the worm gear 34 meshing with the worm wheel 36,
The worm gear 34 is to be rotated.

At this time, the pressing force F1 applied by the teeth of the worm wheel 36 to the teeth of the worm gear 34 acts to rotate the worm gear 34, and moves the worm gear 34 to the other axial end of the shaft 16. Act like so.

Accordingly, the worm gear 34 which has received the pressing force F1 from the worm wheel 36 is going to be displaced along with the shaft 16 toward the other end of the shaft 16 in the axial direction. The brake plate 64 is pressed against the braking surface 66 with a pressing force F2 corresponding to the pressing force F1. In this state, when the worm gear 34 rotates by receiving the rotation from the worm wheel 36, the friction corresponding to the pressing force F2 is generated by the pressing surface 56 and the braking surface 6.
The rotation of the shaft 16 due to the weight of the door glass 44 is prevented, thereby preventing the door glass 44 from being inadvertently lowered.

On the other hand, as described above, the worm wheel 36
Is transmitted to the worm gear 34,
As shown in FIG. 2, the shaft 16 may be bent or the like, and the axial direction of the shaft 16 may be inclined with respect to the normal axial direction.

However, in the power window motor 10, the cross-sectional shape of the press contact surface 56 is not concave or linear, but rather a curved surface protruding outward, more specifically, along the axial direction of the press contact member 50. When cut, the outer peripheral surface protrudes outward in the axial radial direction than a straight line connecting the end of the outer peripheral surface of the press contact portion 54 on the insertion portion 52 side and the end opposite to the insertion portion 52 in the shortest distance. Because of the curved surface, even if the axial direction of the shaft 16 is inclined with respect to the axial direction in a normal state, the contact area between the press contact surface 56 and the braking surface 66 does not change, or even if it changes, The amount of change is small, and a very small portion such as a corner of the press contact portion 54 does not come into contact with the braking surface 66 in a so-called "one-sided" state.

As a result, even when the axial direction of the shaft 16 is inclined with respect to the normal axial direction, the change in friction between the press contact surface 56 and the braking surface 66 is small, and the axial direction of the shaft 16 is reduced. The torque required for unlocking the shaft 16 due to friction in a state where the shaft 16 is tilted with respect to the axial direction in a normal state can be equivalent to that in a state where the axial direction of the shaft 16 is normal.

In the present embodiment, the present invention is applied to a power window motor 10 used in a so-called power window device, but from the viewpoint of the present invention described in claim 1, the motor of the present invention is The invention is not limited to the power window motor 10 used in the power window device as described above.

For example, the present invention may be applied to the driving of a raising / lowering part of a chair for a hairdressing salon or a nursing care bed in which the upper part of the lower part of the user's knee rotates and moves up and down. In this case, the weight of the upper body or the lower part of the knee does not inadvertently lower the elevating part, and the person using the person (a person sitting on the chair if it is a chair, a person lying on the bed if it is a bed) The torque required for unlocking the shaft 16 due to friction in a state where the shaft 16 is inclined with respect to the axial direction when the shaft 16 is normal can be made equivalent to the torque required when the shaft 16 is normal. The effect described above can be obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged plan sectional view of a main part of a motor (power window motor) according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing an upper body in which a rotation axis is inclined.

FIG. 3 is an enlarged perspective view of a braking member and a pressing member.

FIG. 4 is a partially sectional plan view of a motor (power window motor) according to one embodiment of the present invention.

FIG. 5 is a perspective view schematically showing a door panel panel to which a motor (power window motor) according to one embodiment of the present invention is applied.

FIG. 6 is an enlarged plan sectional view of a main part of a conventional power window motor.

FIG. 7 is an enlarged cross-sectional view showing a body in which a rotation axis is inclined in a conventional power window motor.

FIG. 8 is a perspective view of a conventional pressure contact member.

[Explanation of symbols]

 Reference Signs List 10 power window motor (motor) 12 housing 16 shaft (rotating shaft) 20 rotor 22 permanent magnet (magnetic field forming means) 34 worm gear 36 worm wheel 40 door panel 42 support (supporting means) 44 door glass 50 pressure contact member 56 pressure contact surface 60 Braking member 66 Braking surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E052 AA09 CA06 DA03 DA08 DB03 DB08 EA14 EB01 EC01 KA14 KA15 KA16 3D127 CB05 CC05 DF04 3J058 AA47 AA53 AA57 AB28 BA12 CC06 CC73 CD24 FA49 GA92 5H607 AA00 BB01 BB01 BB01 BB01 BB01 BB01 BB01 EE32 EE36

Claims (2)

[Claims] 1. A rotating shaft on which a rotor that rotates by the interaction of a magnetic field formed by itself and a magnetic field formed around the rotating shaft is coaxially and integrally mounted, and at least an axial end side of the rotating shaft. And a housing that is provided in the housing along the axial direction of the rotating shaft so as to face an axial end of the rotating shaft, and has a substantially flat surface facing the axial end of the rotating shaft. A braking member serving as a braking surface, at least a part of a surface facing the braking member is curved so as to protrude outward, and is a pressure contact surface pressed against the braking member, and A press-contact member integrally attached to one end in the axial direction. 2. Rotation of the rotor by interaction between a magnetic field formed by a rotor coaxially and integrally attached to a rotation shaft and a magnetic field formed by magnetic field forming means provided around the rotor. A power window motor for opening and closing a door glass provided on a door panel of a vehicle by a rotating force of the rotor, wherein a worm gear coaxially and integrally provided on the rotation shaft, and the door glass can be opened and closed. A worm wheel that is mechanically connected to the supporting means for supporting the worm gear and meshes with the worm gear to transmit the rotational force of the rotating shaft received via the worm gear to the supporting means; and at least an axial end side of the rotating shaft. A housing for accommodating the rotating shaft, the housing being provided along the axial direction of the rotating shaft, facing the axial end of the rotating shaft, and being provided in the housing. A braking member having a substantially flat braking surface facing the axial end portion; and a braking member curved so that at least a portion of the facing surface facing the braking member projects outward. And a pressure contact member integrally provided at one end of the rotary shaft in the axial direction.