Electric braking device

Abstract

To provide an electrically-driven braking device configured so that electrically-driven cylinder devices can be easily exchanged.SOLUTION: An electrically-driven braking device 30 comprises an electrically-driven cylinder unit 300. The electrically-driven cylinder unit 300 comprises electrically-driven cylinder devices 50A and 50B, an enclosure 31, and a circuit board stored in a board case 40. The electrically-driven cylinder devices 50A and 50B are supported on the enclosure 31 so that the devices are moved relatively in a first X-axis direction X1 with respect to the enclosure 31 and thereby can be detached from the enclosure 31. Electric motors 60 of the electrically-driven cylinder devices 50A and 50B are provided with male connectors 68, and the board case 40 is provided with female connectors 42. When the male connectors 68 are moved in the first X-axis direction X1 relatively with respect to the female connectors 42, fitting of the male connectors 68 to the female connectors 42 are released.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an electric braking device that generates braking force on wheels by supplying brake fluid to wheel cylinders.

Background Art

[0002] The electric braking device described in Patent Document 1 includes an electric cylinder device that adjusts the braking force of a vehicle by supplying and discharging brake fluid to a plurality of wheel cylinders, and a circuit board that controls an electric motor which is a power source of the electric cylinder device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When replacing the electric cylinder device, it is necessary not only to remove the electric cylinder device from the housing but also to disconnect the electrical connection between the electric motor and the circuit board.

Means for Solving the Problems

[0005] An electric braking device for solving the above problems includes an electric cylinder device that converts the rotational motion of an electric motor into a linear motion for driving a piston in a cylinder, a housing that supports the electric cylinder device, a circuit board that controls the electric motor, a power transmission terminal electrically connected to the circuit board, a power reception terminal electrically connected to the electric motor, and a connector that connects the power transmission terminal and the power reception terminal. The electric braking device has an electric cylinder unit that adjusts the braking force applied to the vehicle by the operation of the electric cylinder device. In this electric braking device, the electric cylinder device is supported by the housing so as to be removable from the housing by relatively moving it in the removal direction with respect to the housing when the electric cylinder unit is disassembled. The connector is arranged in a posture with the fitting direction of the connector facing the removal direction.

[0006] According to the above configuration, when the electric cylinder device is removed from the housing by relatively moving the electric cylinder device in the removal direction with respect to the housing, the connector can disconnect the connection between the power reception terminal and the power transmission terminal. That is, by removing the electric cylinder device from the housing, the electrical connection between the electric motor and the circuit board can also be disconnected. Therefore, the electric cylinder device can be easily replaced.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0008] Hereinafter, an embodiment in which the electric braking device is embodied as an electric braking device provided in a vehicle will be described with reference to FIGS. 1 to 7. FIG. 1 shows an electric braking device 30 of the present embodiment, a plurality of wheels 11, and a plurality of friction brakes 20. One friction brake 20 is provided for one wheel 11.

[0009] <Friction Brake 20> The friction brake 20 includes a friction portion 21 that rotates integrally with the wheel 11, a friction portion 22, and a wheel cylinder 23. When brake fluid is supplied to the wheel cylinder 23 and the hydraulic pressure in the wheel cylinder 23 increases, the friction portion 22 is pressed against the friction portion 21. Thereby, a braking force is generated on the wheel 11.

[0010] <Electric Braking Device 30> FIG. 2 is a perspective view showing the electric braking device 30. In FIG. 2, a first axis X, a second axis Y, and a third axis Z that are orthogonal to each other are shown. Of the two directions along the first axis X, one is referred to as the first X-axis direction X1, and the other is referred to as the second X-axis direction X2. Of the two directions along the second axis Y, one is referred to as the first Y-axis direction Y1, and the other is referred to as the second Y-axis direction Y2. Of the two directions along the third axis Z, one is referred to as the first Z-axis direction Z1, and the other is referred to as the second Z-axis direction Z2. In the present embodiment, the "direction along the axis" only needs to be substantially the same as the extending direction of the axis, and includes those that are slightly deviated due to manufacturing errors, assembly errors, etc.

[0011] As shown in FIGS. 1 and 2, the electric braking device 30 has an electric cylinder unit 300. The electric cylinder unit 300 includes a housing 31, a plurality of electric cylinder devices, a substrate case 40, and a circuit board 45. Then, the electric cylinder unit 300 adjusts the braking force applied to the vehicle by the operation of the electric cylinder devices 50A and 50B. In this embodiment, two electric cylinder devices 50A and 50B are provided.

[0012] <<Housing 31>> As shown in FIGS. 1 and 3, the housing 31 supports two electric cylinder devices 50A and 50B. The housing 31 is provided with insertion holes 32 that penetrate the housing 31 in the direction along the first axis X. The housing 31 is provided with the same number of insertion holes 32 as the electric cylinder devices 50A and 50B. The two insertion holes 32 are arranged in the direction along the third axis Z. The housing 31 supports the two electric cylinder devices 50A and 50B in a manner that a part of the electric cylinder devices 50A and 50B is accommodated in the insertion holes 32.

[0013] Note that the housing 31 also supports other component parts for satisfying the braking system. Examples of other component parts include components connected to the circuit board 45 such as a solenoid actuator and a pressure sensor. Further, the housing 31 also has a function as a liquid passage connecting each component part. For example, the housing 31 is provided with an oil port for connecting a pipe to the wheel cylinder 23 and liquid passages connecting the electric cylinder devices 50A and 50B to the aforementioned solenoid actuator, pressure sensor, etc.

[0014] The housing 31 has two side surfaces 33, 34 with openings formed by providing insertion holes 32 in the housing 31. Of the two side surfaces 33, 34, the side surface located in the first X-axis direction X1 is referred to as the support side surface 33, and the side surface located in the second X-axis direction X2 is referred to as the protruding side surface 34. The support side surface 33 and the protruding side surface 34 are, for example, planes orthogonal to the first axis X. Note that, among the side surfaces of the housing 31, the side surface connecting the end of the support side surface 33 in the first Y-axis direction Y1 and the end of the protruding side surface 34 in the first Y-axis direction Y1 is referred to as the substrate-facing side surface 35. The aforementioned solenoid actuator and pressure sensor are disposed on the substrate-facing side surface 35 and are electrically connected to a circuit board 45 provided in the substrate case 40.

[0015] <<Electric cylinder devices 50A, 50B>> As shown in FIG. 1, the electric cylinder devices 50A, 50B include an electric motor 60 as a power source, a rotary transmission mechanism 70, a linear motion conversion mechanism 80, a cylinder 51, and a piston 56. The electric cylinder devices 50A, 50B supply and discharge the brake fluid to and from the wheel cylinder 23 by the linear motion of the piston 56 in the cylinder 51 according to the drive of the electric motor 60. That is, the electric cylinder devices 50A, 50B convert the rotational motion of the electric motor 60 into a linear motion for driving the piston 56 in the cylinder 51.

[0016] The cylinder 51 has a cylindrical main body portion 52, a bottom wall 53 that closes the end of the main body portion 52 in the second X-axis direction X2, and a flange 54 connected to the end of the main body portion 52 in the first X-axis direction X1. The flange 54 is in surface contact with the support side surface 33 of the housing 31. And for example, as shown in FIG. 4, the flange 54 is bolted to the housing 31.

[0017] As shown in FIGS. 1 and 2, the main body portion 52 is inserted through the insertion hole 32. And, among the main body portion 52, the tip portion, which is the end in the second X-axis direction X2, protrudes from the housing 31 in the second X-axis direction X2.

[0018] As described above, since the two insertion holes 32 are arranged in the direction along the third axis Z, the two electric cylinder devices 50A and 50B are arranged in the direction along the third axis Z. Of the two electric cylinder devices 50A and 50B, one electric cylinder device (for example, the electric cylinder device 50A) is defined as the "first electric cylinder device", and the remaining electric cylinder device (for example, the electric cylinder device 50B) is defined as the second electric cylinder device. At this time, the direction along the third axis Z is an example of the radial direction of the cylinder 51 of the electric cylinder device 50A which is the first electric cylinder device. That is, the direction along the third axis Z corresponds to the "alignment direction" of the plurality of electric cylinder devices 50A and 50B. Therefore, in the present embodiment, the two electric cylinder devices 50A and 50B are supported by the housing 31 in a manner arranged in the above alignment direction.

[0019] Furthermore, in the electric cylinder device 50A which is the first electric cylinder device, the axis 51a of the cylinder 51 extends in the direction along the first axis X. Similarly, in the electric cylinder device 50B which is the second electric cylinder device, the axis 51a of the cylinder 51 also extends in the direction along the first axis X. That is, the plurality of electric cylinder devices 50A and 50B are arranged with the axes 51a of their respective cylinders 51 parallel to each other.

[0020] Here, the axis 51a of the cylinder 51 is also the axis of the piston 56. Also, the radial direction of the cylinder 51 is also the radial direction of the piston 56. Therefore, in the present embodiment, it can be said that the plurality of electric cylinder devices 50A and 50B are arranged adjacent to each other in the alignment direction which is the radial direction of the piston 56 with the axes of their respective pistons 56 parallel to each other.

[0021] When disassembling the electric cylinder unit 300, the cylinder 51 can be removed from the housing 31 by releasing the fixation between the flange 54 and the housing 31. That is, the two electric cylinder devices 50A and 50B are supported by the housing 31 in a manner that allows the cylinder 51 to be removed from the housing 31 by relatively moving the cylinder 51 in the first X-axis direction X1 with respect to the housing 31. That is, in the present embodiment, the first X-axis direction X1 corresponds to the "removal direction" in which the electric cylinder devices 50A and 50B are relatively moved with respect to the housing 31 when removing the electric cylinder devices 50A and 50B from the housing 31.

[0022] The piston 56 moves forward and backward in the cylinder 51 in the direction in which the axis 51a of the cylinder 51 extends. That is, the piston 56 is movable in the first X-axis direction X1 and the second X-axis direction X2. When the piston 56 moves in the second X-axis direction X2, brake fluid is supplied from inside the cylinder 51 toward the wheel cylinder 23. On the other hand, when the piston 56 moves in the first X-axis direction X1, brake fluid is discharged from the wheel cylinder 23 toward the cylinder 51.

[0023] The electric motor 60 includes a motor housing 61, a stator 62, a rotor 63, and an output shaft 64 that rotates integrally with the rotor 63. The motor housing 61 is disposed in the first X-axis direction X1 with respect to the housing 31. Specifically, the motor housing 61 is fixed to the cylinder 51 in a manner that it is placed on the flange 54. The stator 62 and the rotor 63 are accommodated in such a motor housing 61. The output shaft 64 protrudes outside the motor housing 61. The output shaft 64 extends in the direction along the first axis X. Therefore, the axis of the electric motor 60 extends in the direction along the axis 51a of the cylinder 51. Specifically, the electric motor 60 is coaxially arranged with the cylinder 51. In the present embodiment, the output shaft 64 protrudes from the motor housing 61 in the second X-axis direction X2.

[0024] In this embodiment, the electric motor 60 is fixed to the cylinder 51 with the motor housing 61 attached to the flange 54. Therefore, by releasing the attachment between the motor housing 61 and the flange 54, the electric motor 60 can be removed from the cylinder 51. Since the output shaft 64 extends in the direction along the first axis X, the electric motor 60 can be removed from the cylinder 51 by moving the electric motor 60 in the first X-axis direction X1, which is also the removal direction. That is, the two electric cylinder devices 50A and 50B are configured to be able to remove the electric motor 60 from the cylinder 51 by relatively moving the electric motor 60 in the first X-axis direction X1 with respect to the cylinder 51.

[0025] Note that a motor angle sensor 66 for detecting the rotation angle of the rotor 63 is provided inside the motor housing 61. For example, the motor angle sensor 66 is a resolver. Such a motor angle sensor 66 outputs a detection signal, which is a signal corresponding to the rotation of the rotor 63, to the circuit board 45.

[0026] As shown in FIGS. 3 and 4, in this embodiment, the electric motor 60 includes an extension portion 67 that extends radially outward from the motor housing 61. Specifically, the extension portion 67 extends from the motor housing 61 in the first Y-axis direction Y1. A male connector 68 that protrudes in the second X-axis direction X2, that is, toward the substrate case 40, is provided on the extension portion 67.

[0027] As shown in FIGS. 5 and 6, a power receiving terminal 91 that is electrically connected to the electric motor 60 is provided on the male connector 68. That is, the power receiving terminal 91 is connected to the coil of the electric motor 60. Further, a sensor terminal, which is a terminal to which the signal line of the motor angle sensor 66 is electrically connected, is provided on the male connector 68.

[0028] The rotational transmission mechanism 70 transmits the rotational motion of the electric motor 60 to the linear motion conversion mechanism 80. Specifically, the rotational transmission mechanism 70 is a speed reduction mechanism that reduces the rotational motion of the electric motor 60 and transmits it to the linear motion conversion mechanism 80. For example, as shown in FIG. 1, the rotational transmission mechanism 70 includes a sun gear 71, a ring gear 72, and a plurality of pinion gears 73. The plurality of pinion gears 73 mesh with both the sun gear 71 and the ring gear 72 and are capable of rotating and revolving. Since the output shaft 64 of the electric motor 60 is connected to the sun gear 71, the sun gear 71 rotates integrally with the output shaft 64. The plurality of pinion gears 73 are connected to the linear motion conversion mechanism 80 via output pins 74.

[0029] The linear motion conversion mechanism 80 converts the rotational motion transmitted from the rotational transmission mechanism 70 into linear motion and outputs it to the piston 56. The linear motion conversion mechanism 80 is, for example, a ball screw mechanism or a feed screw mechanism. Such a linear motion conversion mechanism 80 includes a rotating part 81 to which a plurality of output pins 74 are connected and a linear moving part 82. When rotational motion is transmitted from the plurality of output pins 74 to the rotating part 81, the rotating part 81 rotates, and the linear moving part 82 moves linearly in a direction corresponding to the rotational direction of the rotating part 81. When the linear moving part 82 moves in the second X-axis direction X2, the piston 56 is pushed by the linear moving part 82 and moves in the second X-axis direction X2. On the other hand, when the linear moving part 82 moves in the first X-axis direction X1, the linear moving part 82 pulls the piston 56 in the second X-axis direction X2, and is further assisted by the hydraulic pressure in the cylinder 51, so that the piston 56 moves in the first X-axis direction X1. In the present embodiment, a screw is adopted as the rotating part 81, and a nut arranged on the outer side in the radial direction of the screw is adopted as the linear moving part 82.

[0030] <<Substrate case 40 and circuit board 45>> As shown in FIGS. 1 and 2, the substrate case 40 is generally rectangular parallelepiped, and a circuit board 45 is accommodated therein. The substrate case 40 is fixed to the housing 31. The direction along the first axis X is also the direction in which the axis 51a of the cylinder 51 of the electric cylinder devices 50A and 50B extends, and the direction along the third axis Z is the alignment direction. Therefore, it can be said that the substrate case 40 is adjacent to the housing 31 in the direction along the second axis Y that is orthogonal to both the first axis X and the third axis Z. In other words, as shown in FIGS. 3 and 4, the substrate case 40 is fixed to the housing 31 in a posture facing the substrate facing side surface 35. At this time, the dimension of the substrate case 40 in the direction along the third axis Z is larger than both the dimension of the substrate case 40 in the direction along the first axis X and the dimension of the substrate case 40 in the direction along the second axis Y. The dimension of the substrate case 40 in the direction along the first axis X is larger than the dimension of the substrate case 40 in the direction along the second axis Y.

[0031] The dimension of the substrate case 40 in the first Z-axis direction Z1 is larger than the dimension of the housing 31 in the first Z-axis direction Z1. And a power connector 41 is arranged at an end of the substrate case 40 in the first Z-axis direction Z1. The power connector 41 protrudes from the substrate case 40 in the second Y-axis direction Y2 and is located in the first Z-axis direction Z1 relative to the housing 31. And power is supplied from an in-vehicle power source to the circuit board 45 via the power connector 41.

[0032] A female connector 42 is provided at a position on the side surface of the substrate case 40 that faces the extending portion 67 of the electric motor 60. In the present embodiment, since two electric motors 60 are provided, the two female connectors 42 are arranged side by side in the direction along the third axis Z. A corresponding male connector 68 is fitted to the female connector 42. That is, when the male connector 68 moves in the second X-axis direction X2 (fitting direction), the male connector 68 is fitted to the female connector 42. On the other hand, when the male connector 68 moves in the first X-axis direction X1 in a state where the male connector 68 is fitted to the female connector 42, the fitting between the male connector 68 and the female connector 42 is released.

[0033] As shown in FIGS. 5 and 6, the female connector 42 is provided with a power transmission terminal 92 that is electrically connected to the circuit board 45. When the male connector 68 is fitted to the female connector 42, the power reception terminal 91 is connected to the power transmission terminal 92. Thereby, power can be supplied from the circuit board 45 to the electric motor 60. On the other hand, when the male connector 68 relatively moves in the first X-axis direction X1 with respect to the female connector 42 and the fitting between the male connector 68 and the female connector 42 is released, the connection between the power transmission terminal 92 and the power reception terminal 91 is released. That is, by relatively moving the male connector 68 with respect to the female connector 42 in the first X-axis direction X1 which is the removal direction, the connection between the power transmission terminal 92 and the power reception terminal 91 can be released. Therefore, in the present embodiment, an example of a "connector" that connects the power transmission terminal 92 and the power reception terminal 91 is configured by the male connector 68 and the female connector 42.

[0034] A control unit for controlling a plurality of electric motors 60 is mounted on the circuit board 45. As shown in FIG. 1, such a circuit board 45 has a rectangular plate shape. That is, the periphery of the circuit board 45 has two first edge portions extending in the direction along the third axis Z and two second edge portions extending in the direction along the first axis X. The two first edge portions are parallel, and the two second edge portions are parallel. The length of at least one of the two first edge portions is longer than the length of any of the two second edge portions. Therefore, the circuit board 45 is arranged in a posture in which the longitudinal direction of its board surface extends in the direction along the third axis Z and the short hand direction of its board surface extends in the direction along the first axis X.

[0035] As described above, the axes 51a of the two cylinders 51 extend in the direction along the first axis X. Also, the board surface 451 of the circuit board 45 is parallel to both the first axis X and the third axis Z and is perpendicular to the second axis Y. That is, the circuit board 45 is arranged in a posture in which its board surface 451 is parallel to the axis 51a of the cylinder 51.

[0036] <Actions and Effects in the Present Embodiment> (1) In this embodiment, the electric cylinder devices 50A and 50B can be relatively moved with respect to the housing 31 in the first X-axis direction X1 (removal direction). Then, when removing the electric cylinder devices 50A and 50B from the housing 31, since the power receiving terminal 91 relatively moves in the first X-axis direction X1 with respect to the power transmitting terminal 92, the connection between the power receiving terminal 91 and the power transmitting terminal 92 can be released. That is, by removing the electric cylinder devices 50A and 50B from the housing 31, the electrical connection between the electric motor 60 and the circuit board 45 can also be released.

[0037] On the other hand, when attaching the electric cylinder devices 50A and 50B to the housing 31, the electric cylinder devices 50A and 50B are relatively moved with respect to the housing 31 in the second X-axis direction X2, which is the opposite direction of the first X-axis direction X1. When the electric cylinder devices 50A and 50B are attached to the housing 31 in this way, the power receiving terminal 91 is connected to the power transmitting terminal 92 by the connector. That is, when the electric cylinder devices 50A and 50B are attached to the housing 31, the electric motor 60 and the circuit board 45 can be electrically connected.

[0038] Therefore, the electric cylinder devices 50A and 50B can be easily replaced. (2) In the electric cylinder devices 50A and 50B, the electric motor 60 can be removed from the cylinder 51 by relatively moving the electric motor 60 with respect to the cylinder 51 in the first X-axis direction X1 (removal direction). That is, not only the entire electric cylinder devices 50A and 50B but also only the electric motor 60 can be easily replaced even when it is the case of replacing only the electric motor 60.

[0039] (3) A male connector 68 is provided on an extending portion 67 that extends radially outward from the motor housing 61, and a female connector 42 is provided at a position facing the extending portion 67 in the substrate case 40. That is, at a position visible to the operator, the connection between the power receiving terminal 91 and the power transmitting terminal 92 and the release of the connection can be performed. Therefore, when the electric cylinder devices 50A and 50B are replaced, it is easy for the operator to confirm whether the power receiving terminal 91 is connected to the power transmitting terminal 92.

[0040] (4) In this embodiment, the detection signal of the motor angle sensor 66 is input to the circuit board 45 via the male connector 68 and the female connector 42. Therefore, by releasing the fitting between the male connector 68 and the female connector 42, the electrical connection between the motor angle sensor 66 and the circuit board 45 can be released. On the other hand, by fitting the male connector 68 to the female connector 42, the motor angle sensor 66 and the circuit board 45 can be electrically connected.

[0041] (5) No other member is provided in the second X-axis direction X2 from the housing 31. Therefore, for example, as shown in FIG. 7, an electric cylinder device including a cylinder 51A having a long dimension in the direction along the first axis X can be attached to the housing 31 as the electric cylinder devices 50A and 50B.

[0042] <Modification example> The above embodiment can be implemented with the following modifications. The above embodiment and the following modification examples can be implemented in combination with each other as long as there is no technical contradiction.

[0043] · The electric motor 60 does not have to be configured with a motor angle sensor 66. · As long as the axis of the electric motor 60 extends in the direction along the axis 51a of the cylinder 51, the electric motor 60 does not have to be coaxially arranged with the cylinder 51.

[0044] · As long as the electric cylinder device can be removed from the housing 31 by relatively moving in the first X-axis direction X1 with respect to the housing 31, it does not have to be configured as described in the above embodiment. For example, the electric cylinder device may have a configuration in which the axis 51a of the cylinder 51 and the axis of the electric motor 60 intersect.

[0045] · The electric cylinder device may have a configuration in which the electric motor 60 cannot be removed from the cylinder 51. · The electric braking device 30 may be a combination of three or more electric cylinder devices arranged in a predetermined alignment direction.

[0046] · The number of electric cylinder devices provided in the electric braking device 30 may be one. In this case, it is preferable to supply brake fluid from the electric cylinder device to a plurality of wheel cylinders 23. · The circuit board 45 may be arranged in a posture in which the board surface 451 of the circuit board 45 is not parallel to the axis 51a of the cylinder 51.

[0047] · The shape of the circuit board 45 is not limited to the shape described in the above embodiment. That is, the circuit board 45 may not be in the shape of a rectangular plate as long as it has two first edge portions parallel to each other and two second edge portions extending in a direction orthogonal to the first edge portions, and the first edge portions are longer than the second edge portions.

[0048] · A female connector may be provided on the extending portion 67 of the electric motor 60, and a male connector that fits into the female connector may be provided on the substrate case 40.

Explanation of Reference Numerals

[0049] 11…Wheel 23…Wheel Cylinder 30…Electric Braking Device 300…Electric Cylinder Unit 31…Housing 40…Substrate Case 42…Female Connector 45…Circuit Board 451…Board Surface 50A, 50B…Electric Cylinder Device 51, 51A…Cylinder 51a…Axis 56…Piston 60…Electric Motor 61…Motor Housing 62…Stator 63…Rotor 66…Motor Angle Sensor 67…Extending Portion 68…Male Connector 91…Power Receiving Terminal 92…Power Transmitting Terminal

Claims

1. An electric braking device having an electric cylinder unit that adjusts a braking force applied to a vehicle by the operation of an electric cylinder device, the electric cylinder device including: a housing that supports the electric cylinder device; a circuit board that controls the electric motor; a power transmission terminal electrically connected to the circuit board; a power reception terminal electrically connected to the electric motor; and a connector that connects the power transmission terminal and the power reception terminal. The electric cylinder device converts the rotational motion of the electric motor into a linear motion for driving a piston in a cylinder, and is supported by the housing so as to be removable from the housing by relatively moving it in a removal direction with respect to the housing when the electric cylinder unit is disassembled. The electric cylinder device is supported by the housing so as to be removable from the housing by relatively moving it in a removal direction with respect to the housing when the electric cylinder unit is disassembled. The connector is arranged in a posture in which the fitting direction of the connector is directed in the removal direction. Electric braking device.

2. The electric cylinder device is configured such that the electric motor can be removed from the cylinder by relatively moving the electric motor in the removal direction with respect to the cylinder. The electric braking device according to Claim 1.

3. The removal direction is a direction along the axis of the cylinder. The electric motor is attached to the cylinder in a posture in which the axis of the electric motor extends in a direction along the axis of the cylinder. The electric braking device according to Claim 2.

4. The circuit board is arranged in a posture in which the board surface of the circuit board is parallel to the axis of the piston. The electric braking device according to any one of Claims 1 to 3.

5. The electric motor includes a rotor, a stator, a motor housing that houses the rotor and the stator, and an extension portion that extends radially outward from the motor housing. The power reception terminal is provided on the extension portion. The electric braking device according to any one of Claims 1 to 4.

6. The electric motor includes a rotor, a stator, and a motor angle sensor that detects the rotation angle of the rotor. A detection signal of the motor angle sensor is input to the circuit board via the connector. The electric braking device according to any one of Claims 1 to 5.

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