Brake device

Abstract

The present invention relates to a braking device. The present invention includes: a motor (2) having a power supply terminal (22) for receiving power and capable of adjusting the braking force applied to a wheel according to the rotation of a rotating shaft (20); a substrate (3) arranged orthogonally to the extending direction of the power supply terminal (22) and connected to the power supply terminal (22); and a housing (4) provided at a position facing the substrate (3), and the motor (2) is disposed between the housing (4) and the substrate (3) and is disposed on the housing (4) so that the power supply terminal (22) faces the substrate (3).

Description

Technical Field

[0001] The present invention relates to a braking device. Background Art

[0002] For example, Japanese Patent No. 4355271 discloses a braking device that adjusts braking force by the driving force of a motor. This device increases or decreases the hydraulic pressure in a wheel cylinder by operating a pump using the motor. Further, in this device, a control unit of the motor and the motor are integrated using a housing. A hydraulic circuit including a solenoid valve and a pressure sensor is formed in the housing. A motor is disposed on one side of the housing, and a substrate (ECU substrate) is disposed on the other side of the housing.

[0003] Patent Document 1: Japanese Patent No. 4355271

[0004] However, in the structure of the above device, in order to connect the motor to the substrate, it is necessary to form a through hole in the housing. Since the motor is connected to the substrate via the through hole, the motor wiring harness for supplying power to the motor is long. The longer the motor wiring harness, the greater the power loss, the more likely it is to receive noise, and the worse the assembly workability. Further, in the case where a rotation angle sensor is provided in the motor, the sensor wiring harness is also long because it is connected to the substrate via the through hole in the housing. Thus, in the conventional braking device, there is room for improvement in terms of shortening the connection line between the motor and the substrate. Summary of the Invention

[0005] An object of the present invention is to provide a braking device that can shorten the connection line between a motor and a substrate and can improve assembly workability.

[0006] The braking device of the present invention includes: a motor having a power supply terminal for receiving power and capable of adjusting the braking force applied to a wheel according to the rotation of a rotating shaft; a substrate disposed orthogonal to the extending direction of the power supply terminal and connected to the power supply terminal; and a housing disposed at a position facing the substrate, wherein the motor is disposed between the housing and the substrate and in the housing so that the power supply terminal faces the substrate.

[0007] According to the present invention, the motor is disposed in the housing so as to face the substrate. Thereby, the motor can be connected to the substrate without forming a through hole for a wiring harness in the housing. That is, according to the present invention, since the power supply terminal can be connected to the substrate regardless of the size of the housing, the connection line between the motor and the substrate can be shortened. Further, since the power supply terminal is connected to the substrate without passing through a through hole and the substrate is orthogonal to the power supply terminal, the connection structure is simplified. Thereby, improvement in assembly workability can be achieved. Brief Description of the Drawings

[0008] Figure 1It is a structural diagram (schematic cross-sectional view) of the braking device of this embodiment.

[0009] Figure 2 It is a structural diagram of the braking device of this embodiment.

[0010] Figure 3 It is a structural diagram showing a modified example of the braking device of this embodiment.

[0011] Figure 4 It is a conceptual diagram showing a modified example of the braking device of this embodiment.

[0012] Figure 5 It is a conceptual diagram showing a modified example of the braking device of this embodiment.

[0013] Figure 6 It is a conceptual diagram showing a modified example of the braking device of this embodiment. Detailed implementation mode

[0014] Hereinafter, embodiments of the present invention will be described based on the drawings. Each drawing used in the description is a conceptual diagram. In addition, in this embodiment and its modified examples, the same or corresponding parts in the drawings are denoted by the same reference numerals.

[0015] As Figure 1 shown, the braking device 1 of this embodiment includes a motor 2, a substrate 3, a housing 4, a rotation angle sensor 5, and an electric cylinder 6. The motor 2 is a brushless motor. The motor 2 includes a rotating shaft 20, a main body portion 21 that rotates the rotating shaft 20, and power receiving power supply terminals 22 that connect the main body portion 21 to the substrate 3. The rotating shaft 20 is the output shaft of the motor 2. Both end portions of the rotating shaft 20 protrude from the main body portion 21. In addition, in the description related to the installation position of the motor 2 of the present disclosure, the position of the motor 2 means the position of the main body portion 21.

[0016] The main body portion 21 includes a winding, a stator, a rotor, and a housing that houses them, which are not shown. The power supply terminals 22 are composed of a plurality of rod-shaped (shaft-shaped) conductors connected to the main body portion 21. The power supply terminals 22 are portions that protrude from the main body portion 21 for power reception. The power supply terminals 22 (the base end portions of the power supply terminals 22, that is, the end portions on the main body portion 21 side) face the substrate 3. The power supply terminals 22 protrude from the main body portion 21 toward the substrate 3 without passing through the housing 4. The power supply terminals 22 are connected to the circuit formed on the substrate 3. Electric power is transmitted from the substrate 3 to the main body portion 21 via the power supply terminals 22. The motor 2 is configured to be able to adjust the braking force applied to the wheels according to the rotation of the rotating shaft 20. In addition, the power supply terminals 22 may be connected to the substrate 3 via a wiring portion (harness).

[0017] The substrate 3 is a circuit board (ECU board) that constitutes the brake ECU 30 (electronic control unit). Components such as a CPU and a memory are disposed on the substrate 3, for example. The substrate 3 mainly controls the motor 2 and the electronic components disposed in a hydraulic circuit 9 described later. The substrate 3 is disposed orthogonal to the extending direction (which may also be referred to as the axial direction or the long side direction) of the power supply terminal 22 and is connected to the power supply terminal 22.

[0018] The motor 2 is disposed in the housing 4 such that the axial direction of the rotation shaft 20 is orthogonal to the substrate 3. The motor 2 is disposed between the housing 4 and the substrate 3 and in the housing 4 such that the power supply terminal 22 faces the substrate 3. Hereinafter, in the description, the direction from the main body portion 21 toward the substrate 3 in the axial direction of the rotation shaft 20 will be referred to as the "one axial direction", and the opposite direction thereof will be referred to as the "other axial direction". The portion of the motor 2 other than the other end portion in the axial direction of the rotation shaft 20 is disposed on the one axial direction side with respect to the second surface 4b of the housing 4.

[0019] The housing 4 is disposed at a position facing the substrate 3. The housing 4 is a metal block in which the hydraulic circuit 9 is provided. The housing 4 is formed in a polyhedron shape (for example, a rectangular parallelepiped shape) and has a plurality of surfaces. Specifically, the housing 4 includes a first surface 4a facing the substrate 3, a surface (opposite surface) on the opposite side of the first surface 4a, that is, a second surface 4b, and a plurality of side surfaces 4c connecting the two surfaces 4a and 4b. It can be said that the first surface 4a is the one axial end surface of the housing 4, and the second surface 4b is the other axial end surface of the housing 4. The first surface xa and the substrate 3 are covered with a cover member 42. The cover member 42 is formed in a concave shape. The second surface 4b is covered with a lid member 43.

[0020] The motor 2 is disposed on the first surface 4a. A recess 41 for accommodating the motor 2 is formed in the first surface 4a. The recess 41 is open at the one axial direction and has a bottom surface at the other axial direction. The bottom surface of the recess 41 faces the substrate 3 with the motor 2 interposed therebetween. That is, the bottom surface of the recess 41 can be said to constitute a part of the first surface 4a. Thus, the recess 41 is formed in the housing 4, and the motor 2 is disposed in the recess 41. A through hole 411 through which the rotation shaft 20 is inserted is formed in the bottom surface of the recess 41. The motor 2 is fixed to the recess 41 via an elastic member, for example.

[0021] The rotation angle sensor 5 includes a detected component 51 disposed at the end (axial one end) on the substrate 3 side of the rotation shaft 20, and a detection component 52 disposed on the substrate 3 for detecting the position of the detected component 51. The rotation angle sensor 5 of the present embodiment is an MR sensor (magnetic angle sensor). The detected component 51 is fixed to the axial one end face of the rotation shaft 20. The detected component 51 is configured to include a magnet. The detection component 52 is disposed at a position on the substrate 3 opposite to the detected component 51. The detection component 52 is configured to include a sensor element. The rotation angle sensor 5 is disposed, like the substrate 3, in the substrate accommodation chamber 11 (sealed space) defined by the cover member 42 and the first surface 4a.

[0022] The electric cylinder 6 includes a cylinder body portion 61, a piston 62, an output chamber 63, a speed reduction mechanism 64, and a linear motion conversion member 65. The cylinder body portion 61 is formed as a bottomed cylindrical shape that is open at the other axial end and has a bottom surface at the one axial end by a part of the housing 4. The cylinder body portion 61 is constituted by a recess formed in the second surface 4b of the housing 4.

[0023] The piston 62 is a component that adjusts the braking force by moving in the axial direction. The piston 62 is accommodated in the cylinder body portion 61 so as to be slidable in the axial direction. The cylinder body portion 61 and the piston 62 are arranged parallel to the rotation shaft 20 of the motor 2. In other words, the central axes of the cylinder body portion 61 and the piston 62 are parallel to the rotation shaft 20. The piston 62 is formed as a bottomed cylindrical shape that is open at the other axial end and has a bottom surface at the one axial end.

[0024] The output chamber 63 is formed (defined) by the cylinder body portion 61 and the piston 62. The output chamber 63 is formed inside the cylinder body portion 61. The volume of the output chamber 63 increases or decreases according to the movement of the piston 62. That is, the volume of the output chamber 63 decreases as the piston 62 moves more toward the one axial end, and the volume of the output chamber 63 increases as the piston 62 moves more toward the other axial end. The output chamber 63 is pressurized or depressurized according to the movement of the piston 62.

[0025] The speed reduction mechanism 64 is a mechanism that reduces the rotation of the rotation shaft 20. The speed reduction mechanism 64 is constituted by a plurality of gears. The speed reduction mechanism 64 connects the rotation shaft 20 of the motor 2 to the lead screw shaft 651 of the linear motion conversion member 65 through a plurality of gears. The speed reduction mechanism 64 reduces the rotation of the rotation shaft 20 and transmits it to the linear motion conversion member 65. The detected component 51 is fixed to the axial one end of the rotation shaft 20, and a gear of the speed reduction mechanism 64 is fixed to the axial other end of the rotation shaft.

[0026] The linear motion conversion component 65 is a component that converts the rotational motion of the rotary shaft 20 transmitted via the speed reduction mechanism 64 into the linear motion (axial motion) of the piston 62. The linear motion conversion component 65 is, for example, a ball screw mechanism, and includes a screw shaft 651, a nut 652 disposed on the outer peripheral side of the screw shaft 651, and balls (not shown). The screw shaft 651 and the nut 652 are engaged via the balls.

[0027] The screw shaft 651 is a rod-shaped component, and a groove (not shown) in which the balls can rotate is formed on its outer peripheral surface. The rotation of the rotary shaft 20 is transmitted to the screw shaft 651 via the speed reduction mechanism 64. Therefore, the screw shaft 651 rotates according to the rotation of the rotary shaft 20. A groove (not shown) in which the balls can rotate is formed on the inner peripheral surface of the nut 652.

[0028] The balls are disposed between the groove of the screw shaft 651 and the groove of the nut 652. The nut 652 moves axially according to the rotation of the screw shaft 651. The piston 62 is disposed on one axial side of the nut 652. The piston 62 moves axially according to the axial movement of the nut 652.

[0029] As Figure 1 and Figure 2 shown, a first liquid passage 91 connecting the output chamber 63 and the master cylinder 7 and a second liquid passage 92 connecting the output chamber 63 and the wheel cylinder 8 are formed in the housing 4. An electromagnetic valve 93 that functions as a main cut-off valve is disposed in the first liquid passage 91. The electromagnetic valve 93 is disposed in a recess formed in the first surface 4a of the housing 4, and a part of it protrudes from the first surface 4a toward the substrate 3 side. The connection terminals of the electromagnetic valve 93 are connected to the circuit of the substrate 3.

[0030] In addition, a pressure sensor 94 is disposed in the first liquid passage 91 (or the second liquid passage 92). The pressure sensor 94 detects the hydraulic pressure in the output chamber 63. The pressure sensor 94 is disposed in a recess formed in the first surface 4a of the housing 4, and a part of it protrudes from the first surface 4a toward the substrate 3 side. The connection terminals (spring-like terminals) of the pressure sensor 94 are connected to the circuit of the substrate 3.

[0031] In this way, the hydraulic circuit 9 includes an electric cylinder 6 configured such that the volume of the output chamber 63 increases and decreases according to the movement of the piston 62, a first liquid passage 91 connecting the output chamber 63 and the master cylinder 7, a second liquid passage 92 connecting the output chamber 63 and the wheel cylinder 8, and the electromagnetic valve 93 and the pressure sensor 94 disposed in the first liquid passage 91. In addition, although in the display of the drawings, the second liquid passage 92 is shown as being close to the piston 62, it is connected to one axial end of the output chamber 63.

[0032] As Figure 2As shown, in this example, two hydraulic circuits 9 are provided in the housing 4. Each hydraulic circuit 9 is arranged between the master cylinder 7 and the wheel cylinder 8. The master cylinder 7 is a tandem type master cylinder and includes two pistons 71 that move according to the operation of the braking operation member Z. Each piston 71 is biased toward the initial position by a biasing member. Two master chambers 72 divided by the two pistons 71 are formed inside the master cylinder 7. The volume of the master chamber 72 increases and decreases according to the movement of the piston 71. The master cylinder 7 is configured such that the two master chambers 72 have the same pressure.

[0033] A reservoir 73 for storing brake fluid is connected to each master chamber 72. The communication state between the master chamber 72 and the reservoir 73 is cut off when the piston 71 moves a predetermined amount from the initial position. In addition, a stroke simulator 74 is connected to one of the master chambers 72 (the master chamber 72 farther from the braking operation member Z). In addition, a simulator cut-off valve 75 is arranged between the master chamber 72 and the stroke simulator 74. The stroke simulator 74 is a device that generates a reaction force (reaction force pressure) for a braking operation. The simulator cut-off valve 75 is a normally closed solenoid valve and is opened during normal control (normal time).

[0034] The master cylinder 7 (master chamber 72) is connected to the first hydraulic circuit 91 of the hydraulic circuit 9 via a hydraulic line 76. A pressure sensor 77 for detecting the hydraulic pressure of the master chamber 72 is connected to one of the hydraulic lines 76. In addition, the hydraulic line 76, the pressure sensor 77, and / or the master cylinder 7 may also be provided in the housing 4 in the same manner as the hydraulic circuit 9.

[0035] The wheel cylinder 8 is connected to the second hydraulic circuit 92 of the hydraulic circuit 9. The greater the hydraulic pressure of the wheel cylinder 8, the greater the braking force applied to the wheel. One of the wheel cylinders 8 is provided, for example, on the right front wheel, and the other wheel cylinder 8 is provided, for example, on the left front wheel. In this case, the braking device 1 applies a hydraulic braking force to the front wheels. In addition, the braking device 1 may also be connected to the rear wheels or both the front and rear wheels.

[0036] During normal control, the solenoid valve 93 is closed and the simulator cut-off valve 75 is opened. When the braking operation member Z is operated, the brake ECU 30 sets a target wheel pressure based on the detection values of the stroke sensor 78 and the pressure sensor 77. The brake ECU 30 controls the motor 2 and the electric cylinder 6 based on the target wheel pressure and the detection value of the pressure sensor 94.

[0037] When the piston 62 of the electric cylinder 6 moves in one axial direction, the volume of the output chamber 63 decreases, and the brake fluid is supplied from the output chamber 63 to the wheel cylinder 8 via the second liquid passage 92. That is, the output chamber 63 and the wheel cylinder 8 are pressurized. When the piston 62 moves in the other axial direction, the volume of the output chamber 63 increases, and the output chamber 63 and the wheel cylinder 8 are depressurized. In addition, in the event of an abnormality such as a power failure, the solenoid valve 93, which is a normally open type solenoid valve, is opened, and the simulator cut-off valve 75, which is a normally closed type solenoid valve, is closed. Thereby, according to the operation of the brake operation member Z, the brake fluid is supplied from the master cylinder 7 to the wheel cylinder 8.

[0038] (Effects of the present embodiment)

[0039] According to the present embodiment, the motor 2 is disposed in the housing 4 so as to face the substrate 3. Thereby, the motor 2 and the substrate 3 can be connected without forming a through hole for a wire harness in the housing 4. That is, according to the present embodiment, since the power supply terminal 22 and the substrate 3 can be connected regardless of the size of the housing 4, the connection wire between the motor 2 and the substrate 3 can be shortened. In addition, since the power supply terminal 22 is connected to the substrate 3 without passing through a through hole and the substrate 3 is orthogonal to the power supply terminal 22, the connection structure is simplified. Thereby, an improvement in the assembly workability can be achieved.

[0040] In addition, since the motor 2 is disposed in the recess 41 formed in the housing 4, miniaturization of the brake device 1 and improvement in the heat dissipation performance of the motor 2 can be achieved. By surrounding the periphery of the main body portion 21 of the motor 2 with the metal housing 4, heat dissipation of the main body portion 21 is promoted.

[0041] In addition, the detected member 51 of the rotation angle sensor 5 is fixed to one axial end portion of the rotation shaft 20, and the detection member 52 is fixed to the substrate 3. Thereby, the rotation angle (rotation position) of the motor 2 can be detected with good accuracy. In addition, a sensor wire harness is not required, and a through hole for a wire harness does not need to be provided in the housing 4. That is, simplification of the structure, improvement in the degree of freedom of layout, and improvement in the assembly workability can be achieved.

[0042] In addition, by arranging the piston 62 of the electric cylinder 6 parallel to the rotation shaft 20 of the motor 2, miniaturization of the brake device 1 can be achieved. In addition, since the hydraulic circuit 9 is composed of a small number of devices (the electric cylinder 6, the solenoid valve 93, and the pressure sensor 94), enlargement of the housing 4 is suppressed.

[0043] In addition, the solenoid valve 93 is disposed on the same surface of the housing 4 as the surface on which the motor 2 is disposed (i.e., the first surface 4a). Thereby, compared with the case where the two are disposed on different surfaces, miniaturization design of the brake device 1 becomes easy. In addition, the pressure sensor 94 is also disposed on the same surface as the surface on which the motor 2 is disposed. Thereby, miniaturization of the brake device 1 can also be achieved.

[0044] In addition, the pressure sensor 94 is configured to be away from the motor 2. In this example, in the housing 4, an electric cylinder 6 is arranged between the motor 2 and the pressure sensor 94, and the two are separated correspondingly. Thereby, the influence of the noise generated by the driving of the motor 2 on the pressure sensor 94 can be suppressed. In this example, the solenoid valve 93 is also arranged separately from the motor 2. In addition, a shielding member may be provided on the pressure sensor 94.

[0045] In addition, the first surface 4a of the housing 4 is covered by a cover member 42 fixed to the housing 4. Therefore, the substrate 3, the motor 2, the solenoid valve 93, and the pressure sensor 94 arranged on the first surface 4a side are covered by the cover member 42. Thereby, the motor 2, the substrate 3, and the electronic components can be protected by one cover member (a member with relatively high sealing performance).

[0046] In the present embodiment, as Figure 2 shown, one motor 2 is assigned to one wheel cylinder 8. In the Figure 2 hydraulic circuit 9, miniaturization of the motor 2 and reduction of the number of solenoid valves can be achieved. Therefore, by applying the structure of the present embodiment, the brake device can be effectively miniaturized.

[0047] In the present embodiment, the housing 4 is arranged between the reduction mechanism 64 and the motor 2 (main body portion 21). As Figure 1 shown, the reduction mechanism 64 is not arranged in the substrate accommodation chamber 11 (the space surrounded by the housing 4 and the cover member 42), but is arranged in the back chamber 12 surrounded by the housing 4 and the cover member 43. The motor 2 and the reduction mechanism 64 are arranged opposite to each other with the housing 4 in between. Thereby, there is no concern that the lubricating material applied to the reduction mechanism 64, the wear particles generated by the operation of the reduction mechanism 64, or the brake fluid leaking from the output chamber 63 adheres to the substrate 3, and in addition, there is no need to separately provide a mechanism for protecting the substrate 3 from their influence. It can be said that the housing 4 that divides the substrate accommodation chamber 11 and the back chamber 12 is arranged between the motor 2 and the reduction mechanism 64.

[0048] (Other)

[0049] The present invention is not limited to the above embodiments. For example, as Figure 3 shown, the brake device 1 may also be a structure that presses the brake pad 101 against the disc-shaped rotor 102 by the direct pressing force brought by the movement of the piston 620 instead of the force of hydraulic pressure. In this structure, the motor 2 is also arranged in the recess 41 of the first surface 4a of the housing 4.

[0050] In Figure 3In the example, the piston 620 is coaxially connected to the rotary shaft 20 via a speed reduction mechanism 64 and a direct-acting conversion member 65. That is, the piston 620 is disposed on the other axial side of the rotary shaft 20. The piston 620 moves axially according to the rotation of the rotary shaft 20. By the movement of the piston 620 toward the other axial side, the piston 620 abuts against and presses one brake pad 101 of the brake caliper 100. Due to the structure of the brake caliper 100, the two brake pads 101 sandwich the disc rotor 102 to apply a braking force caused by friction to the wheel. Thus, the piston is not limited to constituting the electric cylinder 6, and it suffices that the braking force is adjusted by movement. In addition, from the viewpoints of miniaturization and layout freedom, the piston is preferably disposed parallel or coaxially with the rotary shaft 20.

[0051] In addition, as Figure 4 shown, there may be no recess 41 on the first surface 4a, and the main body portion 21 of the motor 2 may be disposed on the first surface 4a. In addition, as Figure 5 shown, the entire main body portion 21 of the motor 2 may be disposed within the recess 41. It can be said that at least a part of the main body portion 21 is housed in the recess 41. In addition, as Figure 6 shown, the entire main body portion 21 may be disposed within the recess 41, and the recess 41 may be covered with a cover member 43. The cover member 43 may be, for example, press-fitted and fixed to the recess 41 so as to urge the main body portion 21 toward the other axial side via an elastic member (e.g., an O-ring). Thereby, the shaking of the motor 2 is suppressed.

[0052] In addition, the rotation angle sensor 5 is not limited to an MR sensor, and may be, for example, an optical encoder, a resolver, or the like. In addition, the arrangements of the detected member 51 and the detecting member 52 are not limited to the above-described embodiments. For example, the detecting member 52 may be disposed on the outer peripheral side of the rotary shaft 20. In addition, the speed reduction mechanism 64 may be omitted. In addition, the direct-acting conversion member 65 may be a structure that does not use a ball screw (e.g., a structure used in an electric parking brake). In addition, the motor 2 may not be a brushless motor. In addition, "orthogonal" in the present disclosure also includes a state in which a deviation occurs due to manufacturing errors and tolerances (e.g., 85 to 95 degrees). The same applies to "parallel" in the present disclosure.

Claims

1. A braking device, comprising: A motor having a power supply terminal for receiving electricity and capable of adjusting the braking force applied to a wheel according to the rotation of a rotating shaft; A substrate arranged orthogonally to the extending direction of the power supply terminal and connected to the power supply terminal; and A housing provided at a position facing the substrate, The motor is provided between the housing and the substrate and is provided on the housing so that the power supply terminal faces the substrate, A recess is formed in the housing, and the motor is arranged in the recess, The braking device includes an electric cylinder that includes a cylinder body portion and a piston. The cylinder body portion is formed in the housing and is arranged radially with respect to the motor so that the central axis is parallel to the rotating shaft of the motor. The piston is driven by the motor and is provided inside the cylinder body portion. The electric cylinder is configured such that the volume of the output chamber increases and decreases according to the movement of the piston.

2. The braking device according to claim 1, wherein The recess opens on the first surface side, and the first surface is the surface of the housing that faces the substrate, The cylinder body portion opens on the second surface side, and the second surface is the surface of the housing that is opposite to the first surface.

3. The braking device according to claim 1, wherein A reduction mechanism is provided that reduces the rotation of the rotating shaft, The housing is arranged between the reduction mechanism and the motor.

4. The braking device according to claim 2, wherein A reduction mechanism is provided that reduces the rotation of the rotating shaft, The housing is arranged between the reduction mechanism and the motor.

5. The braking device according to any one of claims 1 to 4, wherein The motor is a brushless motor and is arranged on the housing so that the axial direction of the rotating shaft is orthogonal to the substrate, The braking device includes a rotation angle sensor that has a detected component arranged at an end portion of the rotating shaft on the substrate side and a detecting component arranged on the substrate and detecting the position of the detected component.

6. The braking device according to any one of claims 1 to 4, wherein A hydraulic circuit is provided in the housing, The hydraulic circuit includes: The electric cylinder; A first liquid passage connecting the output chamber to a master cylinder; A second liquid passage connecting the output chamber to a wheel cylinder; A solenoid valve arranged in the first liquid passage; And A pressure sensor arranged in the first liquid passage.

7. The braking device according to claim 5, wherein A hydraulic circuit is provided in the housing, The hydraulic circuit includes: The electric cylinder; A first liquid passage connecting the output chamber to a master cylinder; A second liquid passage connecting the output chamber to a wheel cylinder; A solenoid valve arranged in the first liquid passage; And A pressure sensor arranged in the first liquid passage.

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