JP5077604B2 - Electric disc brake - Google Patents

Description

The present invention relates to brake pad by the electric motor to the electric disk brake that generates a braking force by pressing the disc rotor.

  As an electric disc brake, for example, as described in Patent Documents 1 and 2, the rotational motion of a rotor of an electric motor is converted into a linear motion of a piston using a rotation-linear motion conversion mechanism such as a ball screw mechanism or a ball ramp mechanism. It is known that a braking force is generated by pressing a brake pad against a disc rotor by a piston. The electric disc brake detects a driver's brake pedal depression force (or displacement) by a sensor, and a control device controls the rotation of the electric motor based on the detected value to generate a desired braking force.

  In the electric disc brake described in Patent Document 1, an open / close mechanism is configured by sub-assembling a ball ramp mechanism, a speed reduction mechanism, and the like on a claw portion of a brake caliper. In addition, the motor mechanism is configured by sub-assembling an electric motor, a rotational position sensor, and the like on the case and the cover. The opening / closing mechanism and the motor mechanism are coupled to each other for assembly. As described above, each part is sub-assembled to improve assemblability.

  In the electric disc brake described in Patent Document 2, a drive control device for controlling the driving of the electric motor is integrated into the brake caliper, so that the vehicle-mounted controller mounted on the vehicle body side and the brake caliper The wiring between the power line and the control signal line between them is simplified to reduce the influence of noise and power loss.

  However, in the device described in Patent Document 1, since the electric motor and its drive control device are separated and connected by a cable, they are easily affected by noise, and power loss becomes a problem.

  On the other hand, in the device described in Patent Document 2, it is necessary to individually incorporate components such as a piston, a rotation-linear motion conversion mechanism, an electric motor, and a drive control device in the brake caliper. For this reason, disassembling and assembling are complicated, and operation confirmation cannot be performed unless all of these components are assembled. Therefore, defects must be found for each part during manufacturing and repair. Is difficult.

JP 2000-304076 A JP 2003-137081 A

The present invention has been made in view of the above, the assembly is easy, the electric disk brake that can perform an operation check of the structure unit including the electric motor before assembly of the components of the brake caliper The purpose is to provide.

In order to solve the above-described problems, the present invention provides a pressing member that presses a brake pad, an electric motor, and a rotation-linear motion conversion mechanism that converts rotation of the electric motor into linear motion and transmits the linear motion to the pressing member. In the electric disc brake that propels the pressing member according to the rotation of the electric motor and generates a braking force by pressing the brake pad against the disc rotor,
A motor / controller unit which is constructed by integrating the control unit for controlling said electric motor and said electric motor,
The electric motor includes a motor stator, a motor rotor, and a motor case to which the motor stator is fixed,
The motor / control device unit includes a plate-like member,
A bearing is attached to each of the motor case and the plate member of the electric motor, and the motor rotor is rotatably supported by the bearing of the motor case and the bearing of the plate member .

  According to the present invention, by integrating the motor and the control device into a motor / control device unit, the assembly can be facilitated and the operation can be confirmed as the motor / control device unit before the assembly.

It is a longitudinal cross-sectional view of the electric caliper of the electric disc brake which concerns on 1st Embodiment of this invention. 1 is a perspective view of an electric disc brake according to a first embodiment of the present invention. It is the side view seen from the nail | claw part side of the electric disc brake shown in FIG. FIG. 3 is a front view of the electric disc brake shown in FIG. 2. It is the side view seen from the piston side of the electric disc brake shown in FIG. It is a top view of the electric disc brake shown in FIG. It is a disassembled perspective view which fractures | ruptures and shows the electric caliper shown in FIG. It is the disassembled perspective view seen from the angle different from FIG. 7 which fractures | ruptures and shows the electric caliper shown in FIG. It is a longitudinal cross-sectional view of the electric caliper of the electric disc brake which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the electric caliper of the electric disc brake which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the electric caliper of the electric disc brake which concerns on 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 8, the electric disc brake 1 according to the present embodiment is a caliper floating disc brake, and includes a disc rotor 2 that rotates together with wheels, and a non-rotating portion on the vehicle body side such as a suspension member ( A carrier 3 fixed to the disk rotor 2, a pair of brake pads 4 and 5 disposed on both sides of the disk rotor 2 and supported by the carrier 3, and a pair of slide pins disposed across the disk rotor 2. 6 and 6, an electric caliper 7 (caliper) supported so as to be movable along the axial direction of the disk rotor 2 with respect to the carrier 3 is provided.

The electric caliper 7 includes a caliper main body 8, a piston unit 9, and a motor / control device unit 10.
The caliper body 8 has a cylindrical cylinder portion 11 having a through hole with one end facing one side of the disk rotor 2 and a claw portion extending from the cylinder portion 11 to the opposite side across the disk rotor 2. 12 and a pair of boss portions 13 that extend from the cylinder portion 11 in a substantially diametrical direction and to which the pair of slide pins 6 and 6 are respectively attached are integrally formed. A guide bore 15 into which a piston 14 (described later) of the piston unit 9 is slidably fitted and a male screw 17 of an adjusting screw 16 (described later) attached to the piston unit 9 are screwed on the inner peripheral surface of the cylinder portion 11. A mating female screw 18 is formed.

  The piston unit 9 includes a bottomed cylindrical piston 14 (pressing member), a ball ramp mechanism 19 (rotation-linear motion conversion mechanism) and a differential reduction mechanism 20 housed in the piston 14, and a pad wear compensation mechanism. 21 is integrated. The piston 14 is slidably fitted to the guide bore 15 of the caliper main body 8, abuts against one brake pad 5, engages with the brake pad 5, and is prevented from rotating. The piston 14 and the guide bore 15 are sealed with a dust seal 22 and a seal ring 23. In this embodiment, the pressing member is a bottomed cylindrical piston. However, the present invention is not limited to this, and as long as the guide bore 15 can be sealed, as shown in Prior Art Document 1 having a T-shaped cross section. You may use anything.

  The ball ramp mechanism 19 includes a linear motion disk 24 fixed to the bottom surface of the piston 14, a rotation disk 25 that can rotate and move in the axial direction, and a ball groove 26 formed on the surfaces facing each other. 27 (inclined groove) and a ball 28 (rolling element) inserted. The rotating disk 25 is constantly urged toward the linear motion disk 24 by a spring 29. When the linear motion disk 24 and the rotary disk 25 are rotated relative to each other, the balls 28 roll between the inclined ball grooves 26 and 27, so that the linear motion disk 24 and the rotary disk 25 correspond to the rotation angle. Move relative to the axis. Thereby, a rotational motion can be converted into a linear motion.

  The differential reduction mechanism 20 includes an eccentric shaft 30, a ring-shaped spur gear 32 rotatably fitted to the eccentric portion 31 of the eccentric shaft 30 and having two external teeth 32 </ b> A and 32 </ b> B, and rotation of the ball ramp mechanism 19. An internal tooth 33 formed on the disk 25 and meshing with one external tooth 32A of the spur gear 32, and supported so as to be rotatable with respect to the rotation shaft of the eccentric shaft 30 and meshing with the other external tooth 32B of the spur gear 32. And a ring gear member 35 having internal teeth 34. One end of the eccentric shaft 30 is rotatably supported by the linear motion disk 24 and the rotary disk 25, the other end is extended into the motor / control device unit 10, and an outer spline 36 is formed at the tip. Yes. One end of the ring gear member 35 is in contact with the end of the rotating disk 25 via a thrust bearing 37. Then, by rotating the eccentric shaft 30 and revolving the spur gear 32, the ring gear member having the rotary disk 25 having the internal teeth 33 meshing with the external teeth 32A of the spur gear 32 and the internal teeth 34 meshing with the external teeth 32B. 35 is differentially rotated, and by fixing one of these, the other can be decelerated and rotated at a predetermined reduction ratio.

  The pad wear compensation mechanism 21 includes a limiter 38 mounted between the linear motion disk 24 and the rotary disk 25 of the ball ramp mechanism 19, an adjustment screw 16 coupled to the ring gear member 35 of the differential reduction mechanism 20, a piston 14 and a wave washer 38A interposed between the adjusting screw 16 and the adjusting screw 16. The limiter 38 applies a biasing force in the return direction with a certain amount of play between the linear motion disk 24 and the rotary disk 25 by a torsion spring. The adjustment screw 16 has a male screw 17 (trapezoidal screw) formed on the outer periphery thereof, and the male screw 17 is screwed into a female screw 18 (trapezoidal screw) formed on the cylinder portion 11 of the caliper body 8. The adjustment screw 16 is held so as not to rotate with a constant holding force by the wave washer 38A, and is moved in the axial direction by the relative rotation of the male screw 17 and the female screw 18 by rotating against the holding force. Can do. Further, the adjustment screw 16 receives the reaction force from the rotary disk 25 via the thrust bearing 37 and the gear member 35 and transmits the reaction force to the caliper body 8 via the male screw 17 and the female screw 18.

  The motor / control device unit 10 drives the motor 39, a resolver 40 (rotation detection means) that detects the rotational position of the motor 39, a parking brake mechanism 41 for fixing the rotational position of the motor 39, and the motor 39. A drive control device 42 (control device) for control is integrated by a base plate 43 (plate member).

  The motor 39 is made of an iron-based material that is attached to the one surface 43A side of the aluminum base plate 43 coupled to the end of the caliper body 8 and is inserted into the adjustment screw 16 of the piston unit 9, and has a bottomed cylindrical motor. A case 44 is provided, and a motor stator 45 made of a coil or the like is fixed to the inner periphery of the motor case 44. Bearings 46 and 47 are attached to the bottom of the motor case 44 and an opening provided in the base plate 43, and a cylindrical motor rotor 48 is rotatably supported by these bearings 46 and 47. The motor case 44 abuts on the inner periphery of the cylinder portion 11 of the caliper body 8 and is supported in the radial direction. An inner spline 49 that engages with the outer spline 36 of the eccentric shaft 30 of the piston unit 9 is formed on the inner peripheral portion of the motor rotor 48, and transmits rotational force between the motor rotor 48 and the eccentric shaft 30. These can be moved relative to each other in the axial direction. Thus, the motor 39 is unitized by the motor case 44 and the base plate 43, and by supplying current to the motor stator 45, the motor rotor 48 can be rotated by the motor unit alone, and the motor unit is It is possible to inspect alone.

The resolver 40 includes a resolver stator 50 fixed to the other surface 43B side of the base plate 43 opposite to the motor 39, and a resolver attached to the tip of the motor rotor 48 inserted through the base plate 43 so as to face the resolver stator 50. And a rotor 51. The resolver 40 outputs an electrical signal indicating the rotational speed and rotational position of the motor rotor 48 by these relative rotations.
The parking brake mechanism 41 operates the lock mechanism 52 by an electric actuator to lock the rotation of the motor rotor 48.

  The drive control device 42 is a control circuit mounted on a base plate 43 that is mounted on the opposite side of the base plate 43 from the motor 39. The drive control device 42 is connected to the motor 39 by a wiring 45A, and is connected to the resolver 40 by a wiring 50A. A brake force signal and a resolver 40 commanded from an in-vehicle controller (not shown) mounted on the vehicle body side in order to execute an operation of a brake pedal by a driver or automatic brake control such as traction control and vehicle stabilization control. A drive signal is supplied to the motor 39 based on the rotational position signal from the motor 39 to control the rotation of the motor 39. A cover 53 that covers the resolver 40 and the drive control device 42 is attached to the base plate 43.

  Since the motor 39 and the drive control device 42 are arranged on the base plate 43, unitization into a motor / control device unit can be easily performed. Further, since the base plate 43 is configured to be interposed between the motor 39 and the drive control device 42, the drive control device 42 can be blocked from noise generated by the motor 39. Furthermore, since the resolver 40 and the drive control device 42 are assembled to the base plate 43 adjacent to each other, the electrical connection between the resolver 40 and the drive control device 42 is facilitated. Here, in the present embodiment, the material of the base plate 43 is made of aluminum, but this is because it is possible to configure a complicated shape by aluminum die casting or aluminum casting, not limited to this, You may use the press sheet metal and resin molded product by steel materials.

Next, the operation of the present embodiment configured as described above will be described.
During braking, the in-vehicle controller detects the brake pedal depression force (or displacement amount) of the driver by a brake pedal sensor, and based on this detection value, sends a braking force signal to the drive control device 42 of the electric disc brake 1 of each wheel. Send. The drive control device 42 outputs a drive voltage to the motor 39 based on the braking force signal from the in-vehicle controller, and rotates the motor rotor 48 by a desired rotation angle with a desired torque. The rotation of the motor rotor 48 is decelerated at a predetermined reduction ratio by the differential reduction mechanism 20 and converted into a linear motion by the ball ramp mechanism 21 to advance the piston 14. As the piston 14 advances, one brake pad 5 is pressed against the disc rotor 2, and the caliper body 8 moves along the slide pin 6 of the carrier 3 due to the reaction force, and the claw portion 12 moves the other brake pad 4. Press against the disk rotor 2. Further, at the time of releasing the brake, the piston 14 is moved backward by rotating the motor rotor 48 backward to separate the brake pads 4 and 5 from the disc rotor 2.

  The vehicle controller detects the vehicle state such as the rotational speed of each wheel, the vehicle speed, the vehicle acceleration, the steering angle, and the vehicle lateral acceleration using various sensors, and controls the rotation of the motor 39 based on these detections. By doing so, boost control, anti-lock control, traction control, vehicle stabilization control, and the like can be executed.

Next, the operation of the differential reduction mechanism 20 and the pad wear compensation mechanism 21 will be described.
When the eccentric shaft 30 is rotated by the motor rotor 48 at the time of braking, the spur gear 32 revolves due to the eccentric rotation of the eccentric portion 31, and the rotating disk 25 and the ring gear member 35 engaged with the external teeth 32 </ b> A and 32 </ b> B of the spur gear 32 are different. Dynamic rotation. At this time, normally, the rotation of the ring gear member 35 together with the adjusting screw 16 is fixed by the wave washer 38A, while the rotating disk 25 can freely rotate within the range of play of the limiter 38. Rotates. As a result, the ball ramp mechanism 21 advances the piston 14 and presses the brake pads 4 and 5 against the disc rotor 2. After the brake pads 4 and 5 start to press the disk rotor 2, the reaction force acts on the male screw 17 and the female screw 18, thereby increasing the frictional force between them and adjusting the screw 16, that is, the ring gear member 35. The rotation is securely locked. Therefore, the rotary disk 25 can rotate against the spring force of the limiter 38.

  When the brake pads 4 and 5 are worn and the rotating disk 25 does not press the disk rotor 2 even if it exceeds the play range of the limiter 38, the spring force of the limiter 38 acts on the rotating disk 25, and the rotating disk 25 is The adjusting screw 16 is rotated together with the ring gear member 35 against the holding force of the wave washer 38A. Thereby, the adjustment screw 16 moves forward by the relative rotation of the male screw 17 and the female screw 18 to advance the piston unit 9. When the brake pads 4 and 5 advance by the amount of wear and press the disk rotor 2, as described above, the frictional force of the male screw 17 and the female screw 18 is increased by the reaction force, and the rotation of the adjusting screw 16 is locked. Is done. Thereafter, the rotating disk 25 rotates against the spring force of the limiter 38 and the piston 14 advances by the ball ramp mechanism 21. In this way, the piston unit 9 can be advanced by the adjusting screw 16 as much as the brake pads 4 and 5 are worn, and the wear of the brake pads 4 and 5 can be compensated.

  Next, assembly of the electric caliper 7 of the electric disc brake 1 will be described mainly with reference to FIGS. 1, 7 and 8. The motor 39, the resolver 40, the parking brake mechanism 41, the drive control device 42 and the like are assembled to the base plate 43 to sub-assemble the motor / control device unit 10 (first assembly step). In this sub-assembly, first, in order to unitize the motor 39, the bearing 46 is press-fitted into the bottom of the motor case 44, and then the motor stator 45 is fixed to the inner periphery of the motor case 44. One end of the motor rotor 48 is fitted into the inner periphery of the bearing 46 press-fitted into the bottom of the motor case 44 via the inner periphery of the motor stator 45. After the motor 39 is unitized in this way, the bearing 47 is press-fitted into the one surface 43 </ b> A side of the base plate 43. The other end side of the motor rotor 48 is fitted into the inner periphery of the bearing 47 and the motor case 44 is assembled to the one surface 43 </ b> A side of the base plate 43. At this time, the wiring 45 </ b> A extending from the motor stator 45 is inserted into the through hole 43 </ b> C of the base plate 43.

  After the motor 39 is assembled to the base plate 43 as described above, the resolver rotor 51 is fixed to the other end of the motor rotor 48, and the resolver stator 50 is assembled to the other surface 43B side of the base plate 43 with the axis of the resolver rotor 51 aligned. . Then, the lock mechanism 52 of the parking brake mechanism 41 is assembled to the other surface 43 </ b> B side of the base plate 43.

  Thereafter, the drive control device 42 is assembled on the other surface 43B side of the base plate 43, and the wiring 45A of the motor stator 45 and the wiring 50A of the resolver stator 50 are connected to the drive control device 42. Then, the cover 53 covering the other surface 43B side of the base plate 43 is assembled to the base plate 43, and the assembly of the motor / control device unit 10 is completed.

  Next, the drive control device 42 is energized to rotate the motor 39, and the operation of the motor / control device unit 10 is inspected based on the rotation state of the motor 39 (inspection step). In this inspection, it is checked whether the motor rotor 48 rotates properly, whether the rotational position signal is transmitted from the resolver 40, whether the rotation of the motor rotor 48 and the rotational position signal are synchronized from the resolver 40, or the like.

Further, the piston 14, the ball ramp mechanism 19, the differential speed reduction mechanism 20, the pad wear compensation mechanism 21 and the like are assembled to sub-assemble the piston unit 9. Then, the piston unit 9 is inserted into the cylinder portion 11 of the caliper body 8 and the adjustment screw 16 is screwed. Thereafter, the motor 39 of the motor / control device unit 10 is inserted into the adjustment screw 16, and the base portion of the motor case 44 is inserted from the other end side (one side) of the through hole of the cylinder portion 11 of the caliper body 8. The base plate 43 is fitted into the portion 11 and coupled to the end portion of the caliper body 8 (second assembly step). At this time, the outer spline 36 of the eccentric shaft 30 of the piston unit 9 and the inner spline 49 of the motor rotor 48 are engaged. Further, when the motor case 44 is inserted into the through hole of the cylinder part 11, the outer periphery on the base end side of the motor case 44 comes into contact with the inner periphery of the cylinder part 11 to guide the insertion of the motor / control device unit 10. It has become.
In this way, the electric caliper 7 can be easily assembled.

  Moreover, since the piston unit 9 and the motor / control apparatus unit 10 can be assembled in parallel, productivity can be improved. Since the piston unit 9 and the motor / control device unit 10 can be attached to and detached from the caliper body 8 from the end opposite to the claw portion 12, the assembly and disassembly can be easily performed. Since the piston unit 9 and the motor / control device unit 10 can check the operation on a unit basis, defects can be found on a unit basis during manufacturing and repair. Discovery can be performed efficiently, and defective parts can be replaced in units. Further, by integrating the motor 39 and the drive control device 42, the wiring between them can be simplified, and the loss of power supplied to the motor 39 and the influence of noise can be reduced.

  Since the caliper body 8 and the piston unit 9 are screw-coupled by the male screw 17 of the adjusting screw 16 and the female screw 18 of the cylinder portion 11, the fitting portion between them is reduced, and dimensional control can be eased. it can. Further, since the load can be efficiently transmitted and supported by the screw connection between the male screw 17 and the female screw 18, the caliper rigidity can be increased and the size can be reduced.

  Next, second to fourth embodiments of the present invention will be described with reference to FIGS. 9 to 11. The second to fourth embodiments are generally similar in structure to the first embodiment except that a part of the electric caliper is different. Therefore, only the electric caliper is illustrated, and the first embodiment is the same as the first embodiment. The same parts are denoted by the same reference numerals, and only different parts will be described in detail.

  As shown in FIG. 9, in the electric caliper 54 of the electric disc brake according to the second embodiment, the drive control device 10 of the motor 39 is arranged on the upper part of the cylinder portion 11 of the caliper body 8, that is, on the outer peripheral side of the motor 39. The cover 53 is disposed close to the resolver 41. Thereby, the axial direction dimension of the electric caliper 54 can be shortened.

  As shown in FIG. 10, in the electric caliper 55 of the electric disc brake according to the third embodiment, the drive control device 10 for the motor 39 is disposed behind the piston unit 9. Further, the bearing 47 of the motor rotor 48 is attached not to the base plate 43 but to the motor case 44A. The motor case 44 of the motor 39 does not contact the inner periphery of the cylinder portion 11, and the base plate 43 to which the motor 39 is attached contacts the inner periphery of the cylinder portion 11, thereby positioning the motor 39 in the radial direction. ing. As a result, the radial dimension can be reduced while minimizing the increase in the axial dimension. In the first embodiment, when the caliper body 8 and the motor / control device unit 10 are assembled, the fitting of the motor case 44 and the base plate 43 and the fitting of the motor case 44 and the cylinder portion 11 are performed at two places. Although fitting accuracy is required, in this embodiment, since only the fitting accuracy of the base plate 43 and the cylinder part 11 is requested | required, manufacture becomes easy. Further, the concentricity of the bearings 46 and 47 of the motor 39 can be facilitated. Furthermore, since the motor rotor 48 can be rotated by the motor 39 alone, the inspection by the motor 39 alone is possible.

  As shown in FIG. 11, in the electric caliper 56 of the electric disc brake according to the fourth embodiment, the diameters of the support portions of the bearing 47 and the motor rotor 48 supported by the bearing 47 are expanded, and the resolver 40 is disposed on the inner peripheral portion thereof. Yes. The resolver 40 is disposed on the motor 39 side of the base plate 43, and a ring-shaped resolver rotor 51 is attached to the inner periphery of the support portion by the bearing 47 of the motor rotor 48, and is disposed to face the inner peripheral surface of the resolver rotor 51. A resolver stator 50 is fixed to the base plate 43. Further, the drive control device 10 is disposed behind the piston unit 9. Thereby, the dimension of an axial direction and radial direction can be made small.

  As for the rotation-linear motion conversion mechanism, the ball ramp mechanism 19 is used in the first to fourth embodiments, but other known rotations such as a ball screw mechanism, a roller screw mechanism, and a roller ramp mechanism are used. -A linear motion conversion mechanism may be used. In the first to fourth embodiments, instead of assembling the motor / control device unit 10, the caliper body 8 is obtained by assembling a motor case 44, a motor stator 45, and a motor rotor 48 and integrating them as a motor unit. After assembling, the drive control device 42 may be incorporated. In this case, the motor unit can confirm the operation before assembling to the caliper body 8 by connecting to the drive source that supplies the drive signal instead of the drive control device 42.

  DESCRIPTION OF SYMBOLS 1 Electric disc brake, 2 Disc rotor, 4, 5 Brake pad, 7 Electric caliper (caliper), 11 Cylinder part, 14 Piston (pressing member), 10 Motor / control device unit, 19 Ball ramp mechanism (rotation-linear motion conversion) Mechanism), 39 motor, 40 resolver (rotation detection means) 41 parking brake mechanism, 42 drive control device (control device), 43 base plate (plate member), 44, 44A motor case, 45 motor stator, 48 motor rotor

Claims (6)

A pressing member for pressing the brake pads, and the electric motor, the rotation is transmitted to the pressing member is converted into linear motion the rotation of the electric motor - with a made by disposing a linear motion converting mechanism caliper, the electric In the electric disc brake that propels the pressing member according to the rotation of the motor and generates a braking force by pressing the brake pad against the disc rotor,
A motor / controller unit which is constructed by integrating the control unit for controlling said electric motor and said electric motor,
The electric motor includes a motor stator, a motor rotor, and a motor case to which the motor stator is fixed,
The motor / control device unit includes a plate-like member,
An electric disc, wherein a bearing is attached to each of the motor case and the plate member of the electric motor, and the motor rotor is rotatably supported by the bearing of the motor case and the bearing of the plate member. brake. 2. The electric motor according to claim 1, wherein the electric motor is disposed on one surface side of the plate-like member of the motor / control device unit, and the control device is disposed on the other surface side. Disc brake. The motor case of the electric motor has a bottomed cylindrical shape with one end opened and the other end at the bottom, the bearing is attached to the bottom of the motor case, and the plate-like member closes the opening of the motor case. The electric disc brake according to claim 1, wherein the electric disc brake is provided. The caliper forms a cylinder portion that accommodates the pressing member, the rotation-linear motion conversion mechanism, and the electric motor, and the motor / control device unit integrates the electric motor into the cylinder portion. The electric disc brake according to any one of claims 1 to 3, wherein the electric disc brake is inserted and assembled to the caliper body. 5. The electric disc brake according to claim 1, wherein an outer peripheral portion of the electric motor is abutted against an inner periphery of the cylinder portion and is supported in a radial direction.   The electric disk brake according to claim 1, wherein the control device is disposed on an outer peripheral side of the motor.

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