Electric brake device

Abstract

An electric brake device (10) is provided with a transmission mechanism that transmits the rotation of a motor shaft member (13) of an electric motor (12). An electric brake device (10) is provided with an actuator unit (20) that applies a braking force to a wheel by pressing a friction material (22) against a rotating body (21). The actuator unit (20) moves the friction material (22) in accordance with the rotation of the electric motor (12) transmitted by the transmission mechanism. The electric brake device (10) is provided with a rotation stopping mechanism (50) that stops rotation in the direction in which the braking force is reduced among the rotation directions of the electric motor (12). An electric brake device (10) is provided with a motor bracket (81), which is a member to which an electric motor (12) is attached. The motor bracket (81) is also provided with a rotation stopping mechanism (50).

Description

Technical Field

[0001] The invention relates to an electric brake device. Background Art

[0002] Patent Document 1 discloses an electric brake device in which a motor and a ratchet unit are fixed to the same housing.

[0003] Patent Document 1: Korean Patent Publication No. 10-2021-0004895

[0004] When the motor and the ratchet unit are mounted on the housing as in the electric brake device disclosed in Patent Document 1, precision is required when mounting them on the housing. From the viewpoint of efficiency of the work of assembling the electric brake device, there is room for improvement. Summary of the invention

[0005] The purpose of the electric brake device for solving the above-mentioned problems is to include: a transmission mechanism for transmitting the rotation of a motor shaft component of an electric motor; an actuator part for moving a friction member according to the rotation of the electric motor transmitted by the transmission mechanism, and for pushing the friction member against a rotating body that rotates integrally with the wheel to apply a braking force to the wheel; a rotation stopping mechanism for stopping the rotation in the direction of rotation of the electric motor in which the braking force is reduced by engaging with a rotating part that rotates integrally with the motor shaft component; and a motor bracket for mounting the electric motor, the rotation stopping mechanism also being mounted on the motor bracket.

[0006] According to the above configuration, the electric motor and the rotation stop mechanism can be installed as a unit that integrates the electric motor, the rotation stop mechanism, and the motor bracket. Therefore, the position of the electric motor and the position of the rotation stop mechanism can be specified by the motor bracket. That is, the positional accuracy of the electric motor, the rotation stop mechanism, and the rotating part can be ensured by installing the above unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a partial cross-sectional view showing one embodiment of the electric brake device.

[0008] Figure 2 It is a cross-sectional view showing a part of the electric brake device.

[0009] Figure 3 It is a diagram showing an electric motor, a rotation stopping mechanism, and a motor bracket in the electric brake device.

[0010] Figure 4 It is a front view showing a motor bracket included in the electric brake device.

[0011] Figure 5It is a figure which shows the state which disassembled the said electric brake device.

[0012] Figure 6 It is a diagram showing a motor bracket included in an electric brake device according to a modified example. DETAILED DESCRIPTION

[0013] Below, refer to Figure 1 to Figure 5 An embodiment of the electric brake device will be described.

[0014] <Electric brake device>

[0015] The electric brake device 10 includes an actuator unit 20 that applies a braking force to a wheel by pressing a friction member 22 against a rotating body 21 that rotates integrally with the wheel. The electric brake device 10 includes a transmission mechanism 30 that transmits the rotation of a motor shaft member 13 of an electric motor 12. The actuator unit 20 moves the friction member 22 according to the rotation of the electric motor 12 transmitted by the transmission mechanism 30.

[0016] The electric brake device 10 includes a rotation stopping mechanism 50 that stops the rotation of the electric motor 12 in a direction in which the braking force is reduced by engaging with a rotating portion that rotates integrally with the motor shaft member 13 .

[0017] The electric brake device 10 includes a motor bracket 81 which is a member to which the electric motor 12 is mounted. The motor bracket 81 further includes a rotation stopping mechanism 50 mounted thereon.

[0018] Figure 1 as well as Figure 2 The electric brake device 10 is shown. The electric brake device 10 includes a housing 11a, a cover 11b, and a caliper case 23. The cover 11b covers the opening of the housing 11a. The caliper case 23 is attached to the housing 11a. The housing 11a is closed.

[0019] The electric brake device 10 includes an actuator unit 20. Figure 1 As shown, the actuator unit 20 includes a friction member 22 that can be pressed against a rotating body 21 that rotates integrally with a wheel of a vehicle. The rotating body 21 is, for example, a brake disc. The actuator unit 20 can generate a greater braking force as it increases the force that presses the friction member 22 against the rotating body 21.

[0020] The electric brake device 10 includes an electric motor 12. Figure 1 as well as Figure 2 In the figure, a line along the axis of the motor shaft member 13 of the electric motor 12 is shown as the input axis C1.

[0021] like Figure 2As shown, the actuator unit 20 includes a conversion mechanism 40 that converts the rotational motion of the electric motor 12 into a linear motion. The conversion mechanism 40 is, for example, a feed screw composed of a screw shaft and a nut. The actuator unit 20 includes a piston 41 on which the friction member 22 is mounted at the end facing the rotating body 21. The conversion mechanism 40 and the piston 41 are accommodated in the caliper housing 23. The actuator unit 20 can move the piston 41, that is, move the friction member 22, by using the linear motion converted from the rotational motion of the electric motor 12 by the conversion mechanism 40. One of the directions in which the piston 41 is moved by the linear motion is a direction in which the friction member 22 mounted on the piston 41 is close to the rotating body 21. The other direction in which the piston 41 is moved by the linear motion is a direction in which the friction member 22 mounted on the piston 41 is away from the rotating body 21.

[0022] like Figure 2 As shown, the actuator unit 20 includes a transmission mechanism 30 that transmits the rotational motion of the electric motor 12 to the conversion mechanism 40. The transmission mechanism 30 may include a speed reduction mechanism. An example of the transmission mechanism 30 will be described.

[0023] The transmission mechanism 30 is composed of a combination of gears and the like. The transmission mechanism 30 includes an input gear 31. For example, the input gear 31 is mounted on the motor shaft member 13. The input gear 31 may also be formed by forming teeth on the surface of the motor shaft member 13. The transmission mechanism 30 includes an output gear 33. The transmission mechanism 30 includes an output shaft member 39. The output gear 33 is mounted on the output shaft member 39. Figure 2 In the figure, a line along the axis of the output shaft member 39 is shown as the output axis C2. In one example of the transmission mechanism 30, the output axis C2 is located parallel to the input axis C1.

[0024] The transmission mechanism 30 may also include an intermediate gear 32. The transmission mechanism 30 may also include an intermediate shaft member 38 to which the intermediate gear 32 is mounted. For example, the intermediate gear 32 includes a first gear portion that can mesh with the input gear 31 and a second gear portion that can mesh with the output gear 33. In the intermediate gear 32, the first gear portion and the second gear portion rotate integrally. In an example of the intermediate gear 32, as shown in FIG. Figure 2 The first gear portion and the second gear portion are formed integrally. For example, the transmission mechanism 30 may also include a first intermediate gear corresponding to the first gear portion that can mesh with the input gear 31, and a second intermediate gear corresponding to the second gear portion that can mesh with the output gear 33 as different components. A plurality of intermediate gears may be mounted on the intermediate shaft component 38.

[0025] In the transmission mechanism 30, the rotation of the motor shaft member 13 is input to the input gear 31. The output gear 33 can rotate according to the rotation of the input gear 31. The output gear 33 transmits the rotation to the actuator part 20 via the output shaft member 39. More specifically, the input gear 31 meshes with the first gear portion of the intermediate gear 32, so that the rotational motion of the electric motor 12 can be transmitted from the motor shaft member 13 to the intermediate shaft member 38. The second gear portion of the intermediate gear 32 meshes with the output gear 33, so that the rotational motion of the electric motor 12 can be transmitted from the intermediate shaft member 38 to the output shaft member 39. The output shaft member 39 is connected to the conversion mechanism 40. The output gear 33 rotates the output shaft member 39, so that the rotational motion is transmitted to the conversion mechanism 40.

[0026] In addition, although Figure 2 Although one intermediate gear 32 is illustrated in the figure, a plurality of gears that contribute to the transmission of the rotational motion may be interposed between the input gear 31 and the output gear 33 as the transmission mechanism 30 .

[0027] like Figure 1 As shown, the electric brake device 10 includes a rotation stop mechanism 50. The rotation stop mechanism 50 can maintain the braking force applied by the actuator unit 20. By operating the rotation stop mechanism 50, for example, a parking brake function can be realized. The rotation stop mechanism 50 includes, for example, a solenoid unit 53 and an engaging unit 52 that can be moved by the solenoid unit 53.

[0028] The electric brake device 10 includes a motor bracket 81. The electric motor 12 and the rotation stop mechanism 50 are mounted on the motor bracket 81. The motor bracket 81 is fixed to the housing 11a. That is, the electric motor 12 is fixed via the motor bracket 81. In addition, the rotation stop mechanism 50 is fixed via the motor bracket 81. In the electric brake device 10, the electric motor 12 and the rotation stop mechanism 50 are integrated by using the motor bracket 81, thereby forming a parking brake unit 80. The parking brake unit 80 is accommodated in the housing 11a.

[0029] The electric brake device 10 may also include a circuit unit 60. The circuit unit 60 includes a processing circuit for controlling the rotational motion of the electric motor 12. The circuit unit 60 includes a circuit substrate and a mounting component mounted on the circuit substrate. For example, the circuit unit 60 is housed in the housing 11a. Figure 1 as well as Figure 2 2 shows an example in which the circuit unit 60 is mounted so that the input axis C1, which is a line along the axis of the motor shaft member 13, intersects the circuit unit 60. More specifically, the circuit unit 60 is arranged so that the input axis C1 is orthogonal to the circuit board.

[0030] The electric brake device 10 may also include a rotation angle sensor 62 for detecting the rotation angle of the motor shaft member 13. An example of the rotation angle sensor 62 is a non-contact type sensor. Figure 1 as well as Figure 2 The rotation angle sensor 62 is exemplified as a sensor element 63 and a magnet 64 as a detection target. The sensor element 63 is mounted on a circuit board. The magnet 64 is mounted on the motor shaft member 13. The sensor element 63 is disposed at a position facing the magnet 64.

[0031] The electric brake device 10 may include a partition wall 70 in the housing 11a. For example, the housing 11a may be divided into a housing portion for accommodating the circuit portion 60 by the partition wall 70. More specifically, the first housing portion 18 for accommodating the electric motor 12 and the second housing portion 19 for accommodating the circuit portion 60 may be divided into two portions by the partition wall 70. The transmission mechanism 30 may be accommodated in the first housing portion 18. The solenoid portion 53 of the rotation stopping mechanism 50 may be accommodated in the first housing portion 18.

[0032] A through hole may be formed in the partition wall 70. The first receiving portion 18 and the second receiving portion 19 are connected through the through hole. For example, the partition wall 70 may also have a through hole for arranging the magnet 64 of the rotation angle sensor 62 in the hole. Preferably, the diameter of the through hole is slightly larger than the diameter of the magnet 64 to reduce the gap between the through hole and the magnet 64.

[0033] <Rotation stop mechanism>

[0034] An example of the rotation stopping mechanism 50 functions as a ratchet mechanism. Figure 3 as well as Figure 4As shown, the electric brake device 10 includes a ratchet gear 51 mounted on the motor shaft member 13. The rotation stopping mechanism 50 and the ratchet gear 51 together constitute a ratchet mechanism. The ratchet gear 51 is an example of a rotating part that rotates integrally with the motor shaft member 13. For example, the ratchet gear 51 is formed integrally with the input gear 31. As another example, the ratchet gear 51 may be mounted on the motor shaft member 13 as a component different from the input gear 31. In addition, the ratchet gear 51 may be mounted at a position closer to the electric motor 12 than the input gear 31, or the input gear 31 may be mounted at a position closer to the electric motor 12 than the ratchet gear 51. The engaging portion 52 of the rotation stopping mechanism 50 has a claw shape that meshes with the teeth of the ratchet gear 51. The solenoid portion 53 of the rotation stopping mechanism 50 enables the engaging portion 52 to mesh with the ratchet gear 51. Specifically, the solenoid portion 53 moves the engaging portion 52 in a direction approaching the ratchet gear 51 by passing a current through the coil. If the engaging portion 52 in contact with the ratchet gear 51 meshes with the teeth of the ratchet gear 51, the ratchet gear 51 cannot rotate. The rotation stopping mechanism 50 stops the rotation of the electric motor 12 by preventing the ratchet gear 51 from rotating. In the rotation stopping mechanism 50, the rotation in the direction of the rotation direction of the electric motor 12 in which the braking force is reduced can be stopped. Thus, the rotation stopping mechanism 50 can maintain the braking force applied to the wheel by the actuator unit 20. On the other hand, in the rotation stopping mechanism 50, the rotation in the direction of the rotation direction of the electric motor 12 in which the braking force is increased can be allowed. The rotation stopping mechanism 50 can release the maintenance of the braking force by eliminating the meshing of the engaging portion 52 with the ratchet gear 51.

[0035] The solenoid portion 53 includes a solenoid terminal 53a. The solenoid terminal 53a is connected to, for example, the circuit portion 60. The solenoid terminal 53a is inserted into, for example, a through hole for a terminal formed in the partition wall 70 to penetrate the partition wall 70 and be connected to the circuit portion 60. As another example, the solenoid terminal 53a may be connected to the circuit portion 60 via a connector and wiring. The path connecting the solenoid terminal 53a and the circuit portion 60 is not limited to penetrating the partition wall 70 and may bypass the partition wall 70.

[0036] <Motor bracket>

[0037] The motor bracket 81 includes a fixing portion having a shape corresponding to the housing 11 a as a structure for fixing to the housing 11 a.

[0038] like Figure 3 As shown, the motor bracket 81 includes a motor mounting portion 82 for mounting the electric motor 12 . The end surface of the electric motor 12 from which the motor shaft member 13 protrudes is mounted on the motor mounting portion 82 .

[0039] The motor bracket 81 as an example is in the shape of a flat plate. A surface of the motor bracket 81 on which the motor mounting portion 82 is provided is referred to as a first surface 81a. A surface of the motor bracket 81 opposite to the first surface 81a is referred to as a second surface 81b.

[0040] like Figure 3 As shown, a rotation shaft hole 83 is formed as a through hole in the motor mounting portion 82. The motor shaft member 13 is inserted into the rotation shaft hole 83. The motor shaft member 13 is inserted into the rotation shaft hole 83, thereby penetrating the motor bracket 81 and protruding from the second surface 81b. The input gear 31 and the ratchet gear 51 are mounted on the portion of the motor shaft member 13 that protrudes from the second surface 81b. That is, the electric motor 12, the motor bracket 81, the ratchet gear 51, and the input gear 31 are arranged in order along the axis of the motor shaft member 13.

[0041] The motor bracket 81 may also have a terminal hole as a through hole. Figure 4 As shown, the motor terminal 12a of the electric motor 12 can be inserted into the terminal hole. The motor terminal 12a can be used from the second surface 81b side through the terminal hole. For example, the motor terminal 12a can be connected to the circuit unit 60 via a connector and wiring. As another example, the motor terminal 12a can also be inserted into the through hole for the terminal formed in the partition wall 70 to penetrate the partition wall 70 and be connected to the circuit unit 60.

[0042] like Figure 3 as well as Figure 4 As shown, the motor bracket 81 includes a solenoid mounting portion 85 for mounting the solenoid portion 53 in the rotation stopping mechanism 50. The solenoid mounting portion 85 is provided on the second surface 81b of the motor bracket 81. The solenoid portion 53 is mounted on the solenoid mounting portion 85 so that the engaging portion 52 can protrude toward the ratchet gear 51. In this way, the rotation stopping mechanism 50 is arranged on the side opposite to the electric motor 12 across the motor bracket 81.

[0043] like Figure 4 As shown in FIG. 8 , the motor bracket 81 may also include a transmission shaft hole 86 as a through hole. The shaft member included in the transmission mechanism 30 can be inserted into the transmission shaft hole 86. Figure 2 The transfer shaft bore 86 is shown to be capable of inserting the intermediate shaft member 38 .

[0044] <Parking brake unit>

[0045] The parking brake unit 80 is covered by the housing 11a and the cover 11b. That is, the electric motor 12 is covered by the housing 11a and the cover 11b. In addition, the rotation stop mechanism 50 is covered by the housing 11a and the cover 11b. The parking brake unit 80 is mounted on the housing 11a in such a manner that the rotation stop mechanism 50 faces the opening of the housing 11a.

[0046] <Method for manufacturing electric brake device>

[0047] In the method for manufacturing the electric brake device 10, first, a process of assembling the parking brake unit 80 is performed. Figure 5 As shown in FIG. 1 , a process of mounting the parking brake unit 80 on the housing 11 a is performed.

[0048] An example of a method for manufacturing the electric brake device 10 is specifically described. First, a process of mounting the electric motor 12 on the motor bracket 81 is performed. Next, a process of mounting the ratchet gear 51, the input gear 31, and the magnet 64 on the motor shaft component 13 is performed. Next, a process of mounting the rotation stop mechanism 50 on the motor bracket 81 is performed. After the above processes, the parking brake unit 80 in which the electric motor 12, the rotation stop mechanism 50, and the motor bracket 81 are integrated is assembled. Next, a process of mounting the parking brake unit 80 in which the electric motor 12, the rotation stop mechanism 50, and the motor bracket 81 are integrated is performed. For example, the electric motor 12 is inserted into the opening of the housing 11a from the end face of the electric motor 12 on the side opposite to the end face protruding from the motor shaft component 13, and the parking brake unit 80 is mounted on the housing 11a. After the transmission mechanism 30, the partition wall 70 and the circuit unit 60 are mounted on the housing 11a, the cover 11b is mounted on the housing 11a to block the opening of the housing 11a. In addition, by inserting the intermediate shaft member 38 in the transmission mechanism 30 into the transmission shaft hole 86, the intermediate shaft member 38 can be supported by the motor bracket 81.

[0049] <Function and Effect>

[0050] The operation and effects of this embodiment will be described.

[0051] According to the electric brake device 10, the electric motor 12 and the rotation stop mechanism 50 can be mounted as a parking brake unit 80 that integrates the electric motor 12, the solenoid portion 53 of the rotation stop mechanism 50, and the motor bracket 81. Therefore, the position of the electric motor 12 and the position of the rotation stop mechanism 50 can be specified by the motor bracket 81. That is, for the electric motor 12, the rotation stop mechanism 50, and the ratchet gear 51 as the rotating portion, the positional accuracy between each other can be ensured by mounting the parking brake unit 80. As a result, the efficiency of the work of assembling the electric brake device 10 can be improved.

[0052] In the electric brake device 10 , the positional accuracy between the electric motor 12 and the rotation stopping mechanism 50 can be ensured.

[0053] According to the electric brake device 10, for example, when the specifications of the electric motor 12 and the rotation stop mechanism 50 are made the same, and the specifications of the housing 11a are changed, the following effects can be obtained. The electric motor 12 and the rotation stop mechanism 50 can be mounted on the housing 11a of different specifications by only changing the fixing portion for the housing 11a in the motor bracket 81. That is, it is not necessary to change the motor mounting portion 82 and the solenoid mounting portion 85 in the motor bracket 81, and it is possible to correspond to the housing 11a of different specifications by changing the fixing portion.

[0054] In the electric brake device 10 , by inserting the intermediate shaft member 38 into the transmission shaft hole 86 of the motor bracket 81 , it is possible to ensure positional accuracy between the intermediate shaft member 38 and the electric motor 12 mounted on the motor bracket 81 .

[0055] In the electric brake device 10, the rotation stop mechanism 50 is arranged on the side opposite to the electric motor 12 via the motor bracket 81. By placing the motor bracket 81 in between, the range of arranging the electric motor 12 and the rotation stop mechanism 50 can be expanded without causing the electric motor 12 and the rotation stop mechanism 50 to interfere with each other. That is, there is a degree of freedom in the arrangement of the electric motor 12 and the arrangement of the rotation stop mechanism 50. As a result, it is easy to arrange the electric motor 12 and the rotation stop mechanism 50 to make the electric brake device 10 small.

[0056] In the electric brake device 10, the parking brake unit 80 is covered by the housing 11a and the cover 11b. Thus, a waterproof effect and a dustproof effect can be obtained for the electric motor 12 and the rotation stop mechanism 50. That is, the waterproof effect and the dustproof effect can be obtained without separately covering the electric motor 12 and the rotation stop mechanism 50. In addition, the corrosion resistance of the electric motor 12 and the rotation stop mechanism 50 is improved by the waterproof effect and the dustproof effect.

[0057] In the manufacturing method of the electric brake device 10, the parking brake unit 80 in which the electric motor 12 and the rotation stop mechanism 50 are integrated is mounted on the housing 11a. Therefore, compared with the case where the rotation stop mechanism 50 is further mounted on the housing 11a after the electric motor 12 is mounted on the housing 11a, the operation of mounting the electric motor 12 and the rotation stop mechanism 50 becomes easier.

[0058] (Change Example)

[0059] This embodiment can be implemented with modifications as follows. This embodiment and the following modifications can be implemented in combination with each other within the range that there is no technical contradiction.

[0060] In the above embodiment, a flat plate-shaped motor bracket 81 is exemplified. The shape of the motor bracket 81 is not limited to this.

[0061] Figure 6 The electric brake device 110 shown includes a motor bracket 181 bent into an L shape. The motor bracket 181 is bent so that the second surface 181b is on the inner side. A first wall 187 is formed on one side of the bent portion of the motor bracket 181 and a second wall 188 is formed on the other side.

[0062] The motor mounting portion 182 is provided on the first wall 187. The motor mounting portion 182 is provided on the first surface 181a. The solenoid mounting portion 185 is provided on the second wall 188. For example, the solenoid mounting portion 185 has a through hole through which the engaging portion 52 can pass. Figure 6 2 , the rotation stopping mechanism 50 is exemplified in which the solenoid portion 53 is mounted on the first surface 181 a and the engaging portion 52 protrudes from the second surface 181 b .

[0063] That is, in the electric brake device 110 , the electric motor 12 is mounted on the first wall 187 . In the electric brake device 110 , the solenoid portion 53 is mounted on the second wall 188 .

[0064] In the above embodiment, the electric motor 12 is mounted on the first surface 81a of the motor bracket 81 and the solenoid portion 53 is mounted on the second surface 81b. This is not limited to this, and both the electric motor 12 and the solenoid portion 53 may be mounted on one surface of the motor bracket. For example, Figure 6 As in the illustrated electric brake device 110 , both the electric motor 12 and the solenoid portion 53 may be mounted on the first surface 181 a of the motor bracket 181 .

[0065] In the above-mentioned embodiment, as the rotation stopping mechanism 50, a mechanism that stops the rotation of the electric motor 12 by engaging with the ratchet gear 51 as the rotating part. The rotation stopping mechanism is not limited to this. For example, a mechanism that stops the rotation of the rotor by engaging a columnar engaging portion that can protrude toward the rotor of the electric motor 12 with a hole formed in the rotor may be adopted. In this case, the rotor of the electric motor 12 corresponds to a rotating portion that rotates integrally with the motor shaft member 13. For example, the above-mentioned engaging portion can be moved by a solenoid. For example, in a flat motor bracket on which the electric motor 12 is mounted on the front, the above-mentioned mechanism can be mounted on the back. In this case, by forming a through hole in the motor bracket in advance through which the engaging portion can pass, the engaging portion that passes through the motor bracket can engage with the rotor.

[0066] (Technical Thoughts)

[0067] The technical ideas that can be grasped from the above-mentioned embodiments and modified examples are described.

[0068] [A] The rotation stopping mechanism and the rotating part together constitute a ratchet mechanism,

[0069] The rotating part is a ratchet gear mounted on the motor shaft member.

[0070] The motor bracket is formed with a through hole into which the motor shaft member is inserted.

[0071] The electric motor, the motor bracket, and the ratchet gear are sequentially arranged along the axis of the motor shaft member.

Claims

1. An electric brake device, comprising: a transmission mechanism for transmitting the rotation of a motor shaft component of the electric motor; an actuator part that moves a friction member according to the rotation of the electric motor transmitted through the transmission mechanism and applies a braking force to the wheel by pressing the friction member against a rotating body that rotates integrally with the wheel; a rotation stopping mechanism that stops the rotation of the electric motor in a direction in which the braking force is reduced by engaging with a rotating portion that rotates integrally with the motor shaft member; and The motor bracket is a component for mounting the above electric motor. The rotation stopping mechanism is also mounted on the motor bracket.

2. The electric brake device according to claim 1, wherein: The rotation stopping mechanism is arranged on the opposite side of the electric motor across the motor bracket.

3. The electric brake device according to claim 1 or 2, wherein: A housing is provided that covers the electric motor, the rotation stopping mechanism, and the motor bracket.

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