JP2002039240A - Motor for electric brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor for an electric brake device to facilitate release of a brake through manual operation during incapability of operation of a motor. SOLUTION: A worm 21 is integrally rotatably provided on a rotary shaft 14 of a motor body. A worm wheel 22 capable of moving a brake pad in a direction in which the brake pad is brought into contact with a brake disc through a slider is engaged with the worm 21. A minus groove 30 capable of engaging with a jig is formed in the tip side of the worm 21. A screw hole 31 opposed to the minus groove 30 is formed in a gear housing 12B to store the worm 21 and the worm wheel 22. A hexagon head bolt 32 is threadedly engaged with the screw hole 31. This constitution, since approach of an engaging part between the worm 21 and the worm wheel 22 to the minus groove 30 is facilitated, facilitates manual rotation of the worm 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor for an electric brake device, and more particularly to a motor for operating the brake pad of an electric brake device capable of stopping a vehicle by bringing the brake pad into contact with a brake rotor. It is.

[0002]

2. Description of the Related Art In recent years, there has been proposed a vehicle brake device which is operated by an actuator using an electric motor as a drive source. This type of brake device stops the vehicle by pressing a brake pad against a brake rotor with an electric motor. As a structure for operating the brake pad, for example, there is a structure in which a worm is provided at one end of a rotation shaft of the motor, and the brake pad is operatively connected to a worm wheel decelerated and rotated by the worm.

In this electric brake device, when the electric motor becomes inoperable due to a failure or the like while the brake pad keeps pressing the brake rotor, the brake can be released by separating the brake pad from the brake rotor. There was a problem that it disappeared. Therefore, as a configuration for solving this problem, the brake pad is separated from the brake rotor by enabling the rotation shaft of the motor to be directly rotated from outside using a jig. Has been proposed. In this configuration, the engagement portion between the jig and the rotating shaft is provided at an end of the rotating shaft opposite to the one end provided with the worm.

Further, a through hole is formed in a housing of the motor so that the jig can be inserted into the inside of the motor. This through hole is closed by a rubber cap because it causes water or foreign matter to enter the motor from outside.

[0005]

By the way, in order to realize the stop of the vehicle, when the brake device is operated, a strong pressing force by the brake pad acts on the brake rotor. Therefore, at this time, the brake pad receives a strong reaction force from the brake rotor. This reaction force is transmitted to the worm via the worm wheel. Due to this reaction force, the rotating shaft on which the worm is formed has a state in which the axis is slightly shifted. In this state, the rotational load torque when rotating the rotating shaft becomes very large due to the shift of the engagement between the worm and the worm wheel based on the shift of the axis. Further, as described above, in a rotating shaft provided with an engagement portion with the jig at an end opposite to the worm, an engagement portion between the worm and the worm wheel, Becomes larger. For this reason, the twist generated in the rotation shaft and the worm is increased, and it has been difficult to rotate the worm.

Although the rubber cap is easy to put on and take off, a small gap is often formed between the rubber cap and the housing, which causes water and foreign substances to enter.

A first object of the present invention is to provide a motor for an electric brake device in which manual brake release is easy when the motor cannot be operated. A second object of the present invention is to provide a motor for an electric brake device that can improve the reliability of preventing intrusion of water or foreign matter.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to an electric brake device capable of stopping a vehicle by pressing a brake pad against a brake rotor. A motor to be operated, a worm capable of rotating integrally with a motor main body, a rotation shaft of the motor main body, and the brake pad being movable in a direction in which the worm engages with the worm and abuts on the brake rotor via a slider. Worm wheel and
A gear housing for accommodating the worm and the worm wheel, wherein an engaging portion engageable with a jig is formed at a tip side of the worm, and penetrates through the gear housing so as to face the engaging portion. The gist is to form a hole and to provide a cap for closing the through hole.

According to the present invention, the distance between the engaging portion of the worm and the worm wheel and the engaging portion is reduced. If this interval is reduced, even in a state where a large rotational load torque is required to rotate the worm, it is possible to reduce the twist generated on the rotating shaft and the worm between the engaging portion and the meshing portion. Can be. If there is any engagement between the worm and the worm wheel (for example, a radial displacement of the worm),
It becomes easy to correct the shift by applying a force to the engagement portion in the direction to correct the shift. Therefore, manual rotation of the worm, that is, manual brake release when the motor cannot be operated, etc., is performed more smoothly.

According to a second aspect of the present invention, in the first aspect, a screw portion is formed in the cap,
The gist is that a seal tape is interposed between the screw portion and the gear housing.

According to the present invention, the sealing between the cap and the gear housing is improved by the sealing tape. Therefore, it is possible to improve the reliability of preventing water and foreign substances from entering the electric brake device.

According to a third aspect of the present invention, in the first or second aspect, the cap also serves as a thrust bearing that abuts on a tip side of the worm.

According to the present invention, of the movement of the rotating shaft caused by the force in the thrust direction (rotating shaft direction) received by the worm from the worm wheel, the movement in the direction of the worm tip is:
It is regulated by the contact between the tip of the worm and the cap. According to this, it is not necessary to particularly provide a thrust bearing for restricting the thrust movement to the worm tip side.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the worm is driven by a reaction force generated when the brake pad presses the brake rotor. The gist is that the worm wheel is pressed in a direction opposite to the cap via the worm wheel.

According to the present invention, it is possible to prevent the worm from moving in the cap direction due to the reaction force that the brake pad receives from the brake rotor. For example, when the cap also serves as a thrust bearing that abuts the worm, the pressing force applied to the cap by the worm when the brake pad receives a reaction force from the brake rotor increases. Can be prevented.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, an electric brake device motor (hereinafter simply referred to as a motor) 11 as a drive source of the electric brake device 10 includes a motor housing 12A as an iron motor yoke and a synthetic resin motor yoke. Gear housing 12B. Motor housing 1
An armature 13 is accommodated in 2A. Armature 13
, A rotating shaft 14 is fixed so as to be integrally rotatable. The rotating shaft 14 is disposed over both housings 12A and 12B, and a bearing 15 mounted on the motor housing 12A side.
And rotatably supported by a bearing 16A mounted on the gear housing 12B side. Motor housing 1
A magnet 1 is provided on the inner wall of 2A so as to surround the armature 13.
7 are arranged.

A commutator 18 is provided on the rotating shaft 14 at a position adjacent to the armature 13. The commutator 18 has a plurality of segments 19. Around the segment 19, a power supply brush 20 is attached to the segment 1.
9 so as to be in sliding contact therewith.

The rotating shaft 14 has a large diameter portion 14A whose diameter is set to be larger than the inner diameter of the bearing 16A. Further, a retaining ring 14B is mounted on the rotating shaft 14 on the opposite side of the commutator 18 with the armature 13 therebetween. The retaining ring 14B is fitted in a groove formed in the rotary shaft 14. The large diameter portion 14A has a bearing 16A and a retaining ring 14B.
By contacting the bearing 15, the movement of the rotating shaft 14 in the axial direction is restricted.

The motor housing is constituted by the motor housing 12A, the armature 13, the rotating shaft 14, the retaining ring 14B, the bearings 15, 16A, the magnet 17, the commutator 18, and the power supply brush 20.

The gear housing 12B of the rotating shaft 14
A worm 2 that rotates integrally with the rotating shaft 14
1 is provided. The worm 21 is meshed with a worm wheel 22 rotatably provided on the gear housing 12B by a shaft 22A. Worm wheel 2
2 and the shaft 22A are integrally rotatable.
A worm shaft 22B is integrally rotatably connected to one end of the worm shaft 22B.

A slider housing 23 is fixed to the gear housing 12B. Slider housing 23
, A slider 24 is accommodated so as to be able to reciprocate in the axial direction of the shaft 22A. The slider 24 has a nut portion 24A. The slider 24 is operatively connected to the worm shaft 22B via a nut portion 24A and a plurality of roller screws 25. The roller screw 25 is
It is provided on a support shaft (not shown) fixed to the slider housing 23 so as to be rotatable and not to move in the axial direction of the shaft 22A.

The slider housing 23 has a keyway 23A.
Are formed. The keyway 23A has a slider 2
A key (not shown) formed on the slider housing 4 engages with the slider housing 23 so that the slider 24 cannot be rotated with respect to the slider housing 23.

A brake pad 26 is fixed to the tip 24B of the slider 24 on which the nut portion 24A is not formed. A brake pad 28 is provided on a pad fixing member 27 that is connected to the slider housing 23 so as to be relatively immovable. Both brake pads 26,
A brake disc 29 as a brake rotor fixed to the axle of the vehicle is arranged between the two.

With the above construction, the rotational movement of the rotating shaft 14 is controlled by the worm 21 and the worm wheel 2.
2. The linear motion of the slider 24 is converted via the shaft 22A, the worm shaft 22B and the roller screw 25. The linear movement of the slider 24 narrows the space between the brake pads 26 and 28, and when the brake disk 29 is pressed (sandwiched) by the brake pads 26 and 28, the brake is applied.

As shown in FIG. 2, the tip of the worm 21 is rotatably supported by a bearing 16B. A minus groove 30 as an engaging portion is formed on an end surface on the tip side of the worm 21. The minus groove 30 is set to a size that can be engaged with a jig (for example, a minus driver) for rotating the worm 21.

The gear housing 12B has a minus groove 3
A screw hole 31 as a through-hole is provided so as to face 0. The screw hole 31 is set to a size in which the jig can be inserted. A hexagonal bolt 32 as a cap is screwed into the screw hole 31 so as to close the screw hole 31. Screw part 32A of hexagon bolt 32 and screw hole 31
A seal tape (not shown) is interposed between the gear housing 12B and the gap between the gear housing 12B and the hexagonal bolt 32. The tip of the hexagonal bolt 32 on the screw portion 32A side does not contact the tip of the rotating shaft 14 on the worm 21 side.

When the slider 24 (and the slider housing 23) receives a reaction force from the brake disc 29 via the brake pads 26 (and 28), the worm 21 causes the hex bolt 32 Is pressed in the opposite direction.

Next, the operation of the electric brake device 10 configured as described above will be described. When the motor 11 rotates due to an operation for stopping the vehicle or the like, the worm 2
1. Worm wheel 22, shaft 22A, worm shaft 22
The slider 24 moves toward the brake disk 29 by the power transmitted through the roller B and the roller screw 25. By this movement, the distance between the brake pads 26 and 28 is reduced, and the brake disc 29 is
When pressed (clamped) by 6, 28, the brake is applied. Thereafter, the rotation of the motor 11 is stopped and the state is maintained.

When an operation for releasing this state is performed from the state where the brake is applied, the motor 11 rotates in a direction opposite to the above-described rotation. Then, the slider 24 moves so that the brake pads 26 and 28 are separated from each other. Then, the pressed state of the brake pads 26 and 28 against the brake disc 29 is released, and the brake is released. Thereafter, the rotation of the motor 11 is stopped and the state is maintained.

If the motor 11 becomes inoperable due to a failure or the like while the brake pads 26 and 28 keep pressing the brake disc 29, the brake cannot be released by the motor 11. Therefore, in this state, the brake pads 26,
28 is separated from the brake disc 29. Specifically, first, the hexagon bolt 32 is removed from the gear housing 12B to open the screw hole 31, and the minus groove 30 is exposed. For example, a flathead screwdriver is inserted into the screw hole 31 to engage with the flat groove 30. The worm 21 can be rotated by rotating the flathead screwdriver. Due to this rotation, the slider 24 moves the brake pads 26 and 28 via the worm wheel 22 and the like.
Is moved away from the brake disc 29.

In this embodiment, the following effects can be obtained. (1) A minus groove 30 provided on the tip side of the worm 21
And a screw hole 31 provided in the gear housing 12B so as to face the groove 30 so that the worm 21 can be operated by an external operation of the jig without using the power of the motor 11.
Can be rotated. Thus, even if the motor 11 becomes inoperable due to a failure or the like, the electric brake device 10 can be brought into the brake release state.

(2) A minus groove 30 serving as an input portion of an external driving force for rotating the worm 21 is provided on the distal end side of the worm 21 near the meshing portion between the worm 21 and the worm wheel 22. Thereby, warm 2
Even in a state where a large rotational load torque is required to rotate the rotating shaft 1, the twist generated on the rotating shaft 14 and the worm 21 between the minus groove 30 and the meshing portion can be reduced. If there is any engagement between the worm 21 and the worm wheel 22 (for example, a radial displacement of the worm 21), a force is applied to the minus groove 30 in a direction to correct the displacement, thereby correcting the displacement. It becomes easier to do. Therefore, the manual rotation of the worm 21, that is, the manual release of the brake when the motor 11 is inoperable or the like is performed more smoothly.

(3) The screw hole 31 can be closed with a hexagonal bolt 32. Thereby, intrusion of water or foreign matter into the electric brake device 10 through the screw hole 31 can be suppressed. Hex bolt 32 and screw hole 3
Because screw hole 31 was closed by screwing with 1,
The cap (hexagon bolt 32) can be made harder to come off than when the rubber cap is fitted to the through hole only by the elastic force of the rubber cap itself.

(4) A seal tape is interposed between the screw hole 31 and the hexagonal bolt 32, and the gear housing 12B
And the gap between the hexagonal bolt 32 and the hexagonal bolt 32 are sealed. This makes it possible to improve the reliability of preventing water or foreign matter from entering the electric brake device 10.

(5) Since the slider housing 23 is fixed to the gear housing 12B, the electric brake device 10 as a whole has a shape such that the motor housing 12A projects from the slider housing 23. For example, when a hexagonal bolt or the like as a cap is attached to a portion of the motor housing 12A facing the base end of the rotating shaft 14 so as to protrude outside the motor housing 12A, the electric brake device 10 as a whole becomes Is likely to be even larger. In this embodiment, the slider housing 23 is fixed to the gear housing 12B side, and the hexagon bolt 32 is fixed to the gear housing 12B.
Side, the electric brake device 10
It is easy to suppress the size as a whole.

(Second Embodiment) The motor for an electric brake device according to the second embodiment mainly includes the engaging portion of the rotary shaft 14 and the housing provided so as to face the engaging portion in the first embodiment. The configuration of the through hole on the side is changed, and the other points are the same as those of the electric brake device motor of the first embodiment. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals in the drawings, and redundant description will be omitted.

As shown in FIG. 3, a minus groove 40 is formed at the base end of the rotating shaft 14 as an engaging means. By engaging a jig such as a flathead screwdriver with the flat groove 40, the rotation shaft 14 can be manually rotated from outside.

The motor housing 12A as the first housing has its opening side fixed to the gear housing 12B by a screw member or the like. Motor housing 12A
The first through hole 4 so as to face the minus groove 40.
1 is provided.

An aluminum cover 42 as a second housing is fixed to the gear housing 12B with a screw member or the like so as to cover the motor housing 12A. The cover 42 and the motor housing 12A are not in close contact with each other, and there is a gap between them. The gear housing 12B is provided with an O-ring housing groove 43 at a contact portion with the cover 42, and the O-ring 44
Are arranged.

A cylindrical portion 45 is provided on the cover 42 so as to face the first through hole 41. The inner hole 45 </ b> A of the cylindrical portion 45 functions as a second through hole that communicates the inside and the outside of the cover 42. The diameter of the inner hole 45A is the first
The diameter is set larger than the diameter of the through hole 41. Inner hole 45
A has a female screw portion 46 formed therein. Female thread 46
Is screwed with a screw cap 47 as a plug member. The inner hole 45A is provided with the screw cap 47.
Is to be closed by.

In this embodiment, the following effects can be obtained. (6) The minus groove 40 of the rotating shaft 14, the first through hole 41 of the motor housing 12A, and the inner hole 45 of the cover 42
With A, the rotation shaft 14 can be rotated by operating the jig from outside without using the power of the motor 11. Thus, even if the motor 11 becomes inoperable due to a failure or the like, the electric brake device 10
Can be brought into the brake release state.

(7) A cover 42 is provided so as to cover the motor housing 12A, and a double housing structure is provided.
As a result, the reliability for preventing water or foreign matter from entering the inside of the motor 11 is improved. Also, the motor housing 1
Since it is possible to prevent the 2A from being exposed to the outside, it is not necessary to apply plating or painting for rust prevention on the motor housing 12A, and it is possible to reduce costs. Further, the motor housing 12A as the motor yoke does not directly collide with a foreign substance such as a stepping stone. Therefore, abnormal operation of the motor 11 due to deformation of the motor housing 12A due to the collision is prevented. Further, the impact due to the collision of the foreign matter is less likely to be transmitted to the motor housing 12A side.

(8) A gap is provided between the motor housing 12A and the cover 42. This allows
For example, as compared with the configuration disclosed in Japanese Patent Application Laid-Open No. 10-28349, the outer housing and the inner housing are in close contact with each other. Need not be kept high. In addition, the presence of the void increases the effect of alleviating the impact at the time of the foreign object collision as described in the effect (7).

(9) The inner hole 45A of the cylindrical portion 45 was closed with the screw cap 47. As a result, the reliability for preventing water or foreign matter from entering the inside of the motor 11 is improved. Further, the screw cap 47 is attached to the female screw portion 4.
The screw member 47 is fixed to the cover 42 by screwing, so that the plug member (screw cap 47) is detached as compared with the case where the rubber cap as the plug member is fitted to the housing only by the elastic force of the rubber cap itself. Can be difficult.

(10) Cover 42 and gear housing 1
An O-ring 44 was provided at a contact portion with 2B. As a result, the reliability of preventing water or foreign matter from entering the inside of the motor 11 is further improved.

(11) The diameter of the inner hole 45A is set to be larger than the diameter of the first through hole 41. This facilitates visual recognition of the minus groove 40 from the outside and also facilitates operations such as insertion of a jig.

(Third Embodiment) The motor for an electric brake device according to the third embodiment is modified such that the cover 42 is abolished and the plug member is provided in the motor housing 12A in the second embodiment. In other respects, the configuration is the same as that of the electric brake device motor of the second embodiment. Therefore, the same components as those in the second embodiment are denoted by the same reference numerals in the drawings, and duplicate description will be omitted.

As shown in FIG.
At A, a substantially bottomed cylindrical bearing accommodating portion 12C for accommodating the base end portion of the rotating shaft 14 is formed. Bearing housing 12
A hole 12D is formed on the bottom side of C (the base end side of the rotating shaft 14). The support member 60 is press-fitted into the bearing accommodating portion 12C. The outer peripheral side of the support member 60 is in close contact with the inner peripheral side of the bearing housing portion 12C.

The support member 60 has a cylindrical portion 61 extending therethrough so as to penetrate the hole 12D and protrude outward. The inner hole 61 </ b> A of the cylindrical portion 61 is used to
4 is formed so as to penetrate in the axial direction. Inner hole 61
In A, the bearing 15 is press-fitted on the bearing housing portion 12C side (the armature 13 side when viewed from the base end of the rotating shaft 14). The rotating shaft 14 is rotatably supported by the bearing 15. On the rotating shaft 14, a C-ring 62 and a washer 63 are provided between the bearing 15 and the armature 13. The contact between the C-ring 62 and the bearing 15 via the washer 63 restricts the movement of the rotating shaft 14 (and the armature 13) to the proximal end of the rotating shaft 14. Also,
At the base end of the rotating shaft 14, a minus groove 6 as an engagement means is provided.
4 are provided. The inner hole 61A functions as a support hole that supports one end of the rotating shaft 14 via the bearing 15, and also functions as a through hole that can expose the minus groove 64 to the outside.

On the outer peripheral side of the cylindrical portion 61, a male screw portion 65 as a screw portion is formed. A hexagonal cap nut 66 as a plug member is fixed to the male screw portion 65 by screwing. At this time, a spring washer 67 is interposed between the tip of the cylindrical portion 61 and the hexagonal cap nut 66. Spring washer 67
Is elastically deformed between the tip of the cylindrical portion 61 and the hexagonal cap nut 66 by tightening the hexagonal cap nut 66, and stores elastic energy in the shape restoration direction.

The hexagonal cap nut 66 has a seat facing the motor housing 12A (outside the bearing accommodating portion 12C).
An O-ring housing 68 is formed. An O-ring 69 is provided in the O-ring accommodating portion 68, and the O-ring 69 is tightened by the hexagonal cap nut 66.
6 and the motor housing 12A side.

In this embodiment, the following effects can be obtained. (12) Minus groove 64 of rotating shaft 14 and support member 6
The zero inner hole 61A enables the rotation shaft 14 to be rotated by an external operation of the jig without using the power of the motor 11. Thus, even if the motor 11 becomes inoperable due to a failure or the like, the electric brake device 10 can be brought into the brake release state.

(13) Insert the inner hole 61A into the hexagonal cap nut 66
To close it. As a result, the reliability for preventing water or foreign matter from entering the inside of the motor 11 is improved. Also,
Since the hexagonal cap nut 66 is fixed to the motor housing 12A side by screwing with the male screw portion 65, a rubber cap as a plug member is fitted to the housing side only by the elastic force of the rubber cap itself. The plug member (hexagon cap nut 66) can be prevented from coming off easily.

(14) An O-ring 69 is provided between the seat of the hexagonal cap nut 66 and the motor housing 12A to seal the space between the hexagonal cap nut 66 and the motor housing 12A. Thereby, the motor 11
The reliability of preventing intrusion of water or foreign matter into the inside of the device is further improved.

(15) A spring washer 67 is interposed between the tip of the cylindrical portion 61 and the hexagonal cap nut 66 so that the spring washer 67 stores elastic energy in the shape restoring direction by tightening the hexagonal cap nut 66. did. Thereby, loosening of the hexagonal cap nut 66 can be prevented. Therefore, the reliability of preventing the entry of water or foreign matter into the motor 11 is further improved.

The embodiment is not limited to the above, and may be, for example, in the following mode. ○ The electric brake device of the present invention is not limited to one using a disk-type brake rotor. For example, a type using a drum type brake rotor may be used.

The engaging portion and the engaging means provided on the rotating shaft 14 need not be minus grooves. For example, plus groove,
Any shape, such as a hexagonal hole or a star-shaped hole, may be used as long as the jig can be engaged and rotated.

In the first embodiment, the screw holes 31
A seal tape may not be interposed between the hexagonal bolt 32 and the hexagonal bolt 32. In the first embodiment, instead of interposing a sealing tape between the screw hole 31 and the hexagonal bolt 32,
The hex bolt 32 may be fixed to the gear housing 12B side together with packing such as rubber.

In the first embodiment, instead of the hexagonal bolt 32, a hexagonal socket bolt or a screw that can be used with a plus or minus screwdriver may be used. Alternatively, a knurled outer periphery of a columnar screw, a screw provided with a knob, or the like may be used.

In the first embodiment, the rotation shaft 14
Instead of providing the large diameter portion 14A, a groove may be provided in the rotating shaft 14 and a C-ring may be fitted into the groove. In this case, the bearing 15 is connected to the C by a flat washer or the like.
The movement of the rotating shaft 14 toward the hexagonal bolt 32 can be restricted by contacting the ring. Further, the bearing 16A may be of a type in which the outer ring and the inner ring rotate relative to each other, and the axial movement of the rotating shaft 14 may be restricted by press-fitting the rotating shaft 14 into the inner ring.

In the first embodiment, the tip of the screw portion 32A of the hexagonal bolt 32 is brought into contact with the tip of the worm 21 to restrict the thrust movement of the rotary shaft 14 toward the tip of the worm 21. You may make it. In this case, it is not necessary to form the large diameter portion 14A on the rotating shaft 14. In addition, it is not necessary to particularly provide a thrust bearing for restricting the thrust movement of the rotating shaft 14 toward the tip of the worm 21. In each of the above embodiments, when the slider 24 receives a reaction force from the brake disk 29 via the brake pad 26, the worm 21 is pressed in the direction opposite to the hexagon bolt 32 via the worm wheel 22. I was doing it. Thus, it is possible to prevent the pressing force applied to the hexagonal bolt 32 from the distal end side of the worm 21 from increasing.

In the first embodiment, the slider 2
4 is a brake disc 29 via a brake pad 26
When the worm 21 receives the reaction force from
It may be configured to be pressed to two sides.

In the first and second embodiments, the cap (the plug member in the second embodiment) and the housing are fixed by screwing. However, the cap may not be fixed by screwing. For example, it may be fixed by press fitting or the like.

In the second embodiment, for example, FIG.
As shown in FIG. 8, the space between the motor housing 12A and the cover 42 may be filled with a vibration isolator 80. According to this,
Rotational vibration of the armature 13 and the like becomes difficult to transmit to the outside of the motor 11. Further, the impact due to the collision of a foreign substance such as a stepping stone is less likely to be transmitted to the motor housing 12A.

In the second embodiment, there may be no gap between the motor housing 12A and the cover 42. That is, both may be close. In the second embodiment, the cover 42 may not be made of aluminum. For example, it may be made of a synthetic resin.
When made of synthetic resin, the motor 11 can be reduced in weight. By forming the cover 42 from aluminum or synthetic resin, it is not necessary to apply painting or plating for rust prevention.

In the second embodiment, the cover 42 and the gear housing 12B are fixed using a screw member or the like. However, a screw portion is formed on each of the cover 42 and the gear housing 12B, and the screw member or the like is used. Instead, both may be fixed to each other. For example, as shown in FIG. 6, a female screw portion 90 is formed on the inner periphery of the opening of the cover 42. Further, a male screw portion 91 is formed on the outer periphery of the opening portion (the portion on the cover 42 side) of the gear housing 12B so as to correspond to the female screw portion 90. With this configuration, by screwing the female screw portion 90 and the male screw portion 91, the gear housing 12B and the cover 42 can be connected and fixed without using a screw member or the like.

In the second embodiment, the screw cap 47 may not be provided. In the second embodiment, the inner hole 45A of the cylindrical portion 45
May be set to be smaller than the diameter of the first through hole 41 of the motor housing 12A as long as a jig or the like to be engaged with the minus groove 40 can be inserted.

In the third embodiment, instead of the hexagonal cap nut 66, a cap nut having a square or octagonal outer peripheral shape may be used. Moreover, the outer periphery of which is knurled on a columnar shape may be used.

In the third embodiment, the rotating shaft 14
Instead of providing the C ring 62 and the washer 63 thereon, a large diameter portion having an outer diameter larger than the inner diameter of the bearing 15 may be provided in a portion between the armature 13 and the bearing 15 of the rotating shaft 14. . The contact between the large-diameter portion and the bearing 15 enables the movement of the rotary shaft 14 (and the armature 13) to be restricted from moving toward the base end of the rotary shaft 14.

In the third embodiment, the support member 6
The shape of the male screw part 65 and the female screw part of the hexagonal cap nut 66 may be a PT screw (taper screw for pipe) shape.
According to this, the slack preventing effect of the two screw portions is increased.

Next, technical ideas other than the inventions described in the claims that can be grasped from the above-described embodiments will be described below together with their effects. (1) A motor for operating a brake pad of an electric brake device for stopping a vehicle, wherein an engagement means for rotating the rotating shaft is provided at an end of the rotating shaft of the motor,
A first through-hole for exposing the engagement means is provided in a first housing of the motor, and a second housing provided to cover the first housing is provided with a second through-hole so as to face the first through-hole. A motor for an electric brake device having two through holes. According to this, the reliability of preventing water or foreign matter from entering the inside of the motor is improved. Further, since the first housing can be prevented from being wet, the first housing does not need to be rust-proofed, and the cost can be reduced. Further, since the first housing does not directly collide with a foreign substance such as a stepping stone, abnormal operation of the motor due to deformation of the first housing due to the collision is prevented. Further, the impact due to the collision of the foreign matter is less likely to be transmitted to the first housing side.

(2) The electric brake device motor according to the above technical concept (1), wherein the second housing is provided with a plug member for closing the second through hole. According to this, the reliability of preventing water or foreign matter from entering the inside of the motor is improved.

(3) The motor for an electric brake device according to the technical concept (1) or (2), wherein a space between the first housing and the second housing is filled with a vibration-proof material. According to this, it becomes difficult for the rotational vibration or the like generated by the motor main body to be transmitted to the outside of the motor. Further, the impact due to the collision of a foreign substance such as a stepping stone is less likely to be transmitted to the first housing side.

(4) The technical concept (1), wherein the second through-hole is larger than the first through-hole.
The motor for an electric brake device according to any one of (1) to (3). According to this, it is easy to visually recognize the engaging means from the outside, and it is easy to insert a jig or the like engaged with the engaging means.

(5) A motor for operating a brake pad of an electric brake device for stopping a vehicle, wherein an engagement means for rotating the rotating shaft is provided at an end of a rotating shaft of the motor, and A through hole for exposing the engaging means is provided in the housing, a screw portion is provided in the housing so as to surround the through hole, and a plug member which engages with the screw portion and closes the through hole, and the housing, and A motor for an electric brake device having an O-ring disposed between the two. According to this, the reliability of preventing water or foreign matter from entering the inside of the motor is improved.

(6) A motor for operating a brake pad of an electric brake device for stopping a vehicle, wherein an engagement means for rotating the rotating shaft is provided at an end of a rotating shaft of the motor, and A through hole for exposing the engaging means is provided in the housing, a screw portion is provided in the housing so as to surround the through hole, and a plug member which engages with the screw portion and closes the through hole, and the housing, and An electric brake device motor with a spring washer between them. According to this, loosening of the plug member can be prevented. Therefore, the reliability of preventing the entry of water or foreign matter into the motor is improved.

[0078]

As described in detail above, according to the first to fourth aspects of the present invention, in the motor for the electric brake device, the manual release of the brake when the motor cannot be operated becomes easy. According to the second aspect of the present invention,
In the motor for the electric brake device, it is possible to improve the reliability of preventing intrusion of water or foreign matter.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an outline of an electric brake device according to a first embodiment.

FIG. 2 is a partially enlarged sectional view showing a main part of the electric brake device motor.

FIG. 3 is a partially broken cross-sectional view showing an outline of a motor for an electric brake device according to a second embodiment.

FIG. 4A is a partial cross-sectional view showing a main part of an electric brake device motor according to a third embodiment (with a plug member separated from a housing), and FIG. The front view showing the state seen from the side in the rotation axis direction.

FIG. 5 is a partial cross-sectional view showing an outline of another example of a motor for an electric brake device.

FIG. 6 is a partial cross-sectional view showing an outline of another example of a motor for an electric brake device.

[Explanation of symbols]

Reference Signs List 10: electric brake device, 11: motor for electric brake device, 12A: motor housing as first housing, 12B: gear housing, 13: armature, 14: rotating shaft, 14B: retaining ring, 15, 16A: bearing, 17 ... magnet, 18 ... commutator, 20 ... power supply brush (1
2A, 13, 14, 14B, 15, 16A, 17, 18
And 20 constitute the motor body), 21... Worm,
22: worm wheel, 24: slider, 26, 28
... Brake pads, 29 ... Brake discs as brake rotors, 30 ... Minus grooves as engagement portions, 31
... Screw hole as through-hole, 32 ... Hexagon bolt as cap, 32A ... Screw part, 40, 64 ... Minus groove as engagement means, 41 ... First through-hole, 42 ... Cover as second housing, 45A ... an inner hole as a second through hole,
47: screw cap as a plug member; 61A: inner hole as a through hole; 65: male screw portion as a screw portion;
6 hexagonal cap nut as a plug member, 69 O-ring, 6
7: Spring washer, 80: Anti-vibration material.

Claims (4)

[Claims] 1. A motor for operating a brake pad of an electric brake device capable of stopping a vehicle by pressing a brake pad against a brake rotor, the motor being capable of rotating integrally with a motor body and a rotating shaft of the motor body. A worm, a worm wheel that meshes with the worm and is capable of moving the brake pad in a direction in which the brake pad is brought into contact with the brake rotor via a slider, and a gear housing that houses the worm and the worm wheel. For an electric brake device, an engaging portion engageable with a jig is formed on the distal end side, and a through hole is formed in the gear housing so as to face the engaging portion, and a cap for closing the through hole is provided. motor. 2. The motor for an electric brake device according to claim 1, wherein a screw portion is formed in the cap, and a seal tape is interposed between the screw portion and the gear housing. 3. The motor for an electric brake device according to claim 1, wherein the cap also serves as a thrust bearing that comes into contact with a tip side of the worm. 4. The worm is pressed via the worm wheel in a direction opposite to the cap by a reaction force generated when the brake pad presses the brake rotor. The motor for an electric brake device according to any one of the above.