Electric braking device

Abstract

To provide an electric braking device that has an improved arrangement of a circuit part.SOLUTION: An electric braking device 10 comprises a transmission mechanism 30 which has: an input gear 31 for inputting rotation of a motor shaft member 13; an output gear 33 which is configured to rotate according to rotation of the input gear 31, and transmit rotation to an actuation part. The electric braking device 10 comprises a circuit part 60 formed of: a circuit board 61; mounting components 62, 63 mounted on the circuit board 61. In the electric braking device 10, the circuit board 61 and the electric motor 12 are arranged so that a virtual plane parallel to the circuit board 61 and an axial direction of the motor shaft member 13 cross. In the electric braking device 10, the output gear is arranged to cross a specific plane P2 which is a plane passing through the circuit part 60, out of virtual planes being parallel to the circuit board 61.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electric braking device. [Background technology]

[0002] Patent Document 1 discloses an electric braking device that includes an electric motor, a piston that presses a friction material against a rotating body, and a linear motion conversion mechanism that converts the rotation of the electric motor to linearly move the piston. The electric braking device includes an ECU that is composed of an ECU cover attached to the outside of a housing and an ECU board housed between the housing and the ECU cover. The ECU is located at a position perpendicular to an axis that extends along the rotational shaft of the electric motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Korean Patent Publication No. 10-2021-0004895 Summary of the Invention [Problem to be solved by the invention]

[0004] In an electric braking device in which the ECU is mounted outside the housing as disclosed in Patent Document 1, there is a problem in that the size of the electric braking device increases by the size of the ECU cover in the direction extending along the rotation shaft of the electric motor. [Means for solving the problem]

[0005] The electric braking device for solving the above problem comprises an electric motor that rotates a motor shaft member; an actuator unit that can move friction material in accordance with the rotation of the motor shaft member in the electric motor and generate a braking force on the wheel of a vehicle by pressing the friction material against a rotating body that rotates integrally with the wheel; a transmission mechanism that transmits the rotational motion of the motor shaft member to the actuator unit, the transmission mechanism having an input gear that inputs the rotation of the motor shaft member and an output gear that is configured to rotate in accordance with the rotation of the input gear and transmits the rotation to the actuator unit; and a circuit unit that controls the electric motor, the circuit unit being configured with a circuit board and components mounted on the circuit board, wherein the circuit board and the electric motor are arranged so that an imaginary plane parallel to the circuit board intersects with the axial direction of the motor shaft member, and the output gear is arranged so that it intersects with a specific plane of the imaginary plane that passes through the circuit unit.

[0006] According to the above configuration, the output gear is positioned so as to intersect with a specific imaginary plane that passes through the circuit unit among imaginary planes parallel to the circuit board, so that the output gear and the circuit unit overlap in the axial direction of the motor shaft member that intersects with the imaginary plane, which prevents the size of the electric braking device from increasing in the axial direction of the motor shaft member. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a partial cross-sectional view showing an embodiment of an electric braking device. [Figure 2] FIG. 2 is a schematic diagram showing the electric braking device. [Figure 3] FIG. 3 is a schematic diagram showing a modified electric braking device. [Figure 4] FIG. 4 is a schematic diagram showing an electric braking device according to another modified example. [Figure 5] FIG. 5 is a schematic diagram showing an electric braking device according to another modified example. [Figure 6]FIG. 6 is a schematic diagram showing an electric braking device according to yet another modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] An electric braking device 10, which is one embodiment of the electric braking device, will be described below with reference to FIGS. <Electric braking device> The electric braking device 10 includes an electric motor 12 that rotates a motor shaft member 13. The electric braking device 10 includes an actuator unit 20 that can move a friction material 22 in response to the rotation of the motor shaft member 13 of the electric motor 12 and generates a braking force on the vehicle wheel by pressing the friction material 22 against a rotor 21 that rotates integrally with the wheel. The electric braking device 10 includes a transmission mechanism 30 that transmits the rotational motion of the motor shaft member 13 to the actuator unit 20. The transmission mechanism 30 has an input gear 31 that inputs the rotation of the motor shaft member 13, and an output gear 33 that is configured to rotate in response to the rotation of the input gear 31 and transmits the rotation to the actuator unit 20. The electric braking device 10 includes a circuit unit 60 that controls the electric motor 12 and is configured to include a circuit board 61 and components mounted on the circuit board 61.

[0009] In the electric braking device 10, the circuit board 61 and the electric motor 12 are arranged so that an imaginary plane parallel to the circuit board 61 intersects with the axial direction of the motor shaft member 13. In the electric braking device 10, the output gear is arranged so as to intersect with a specific plane P2, which is a plane passing through the circuit unit 60 among imaginary planes parallel to the circuit board 61.

[0010] 1 shows an electric braking device 10. The electric braking device 10 includes a housing 11. The electric braking device 10 includes an actuator unit 20. The actuator unit 20 includes a friction material 22 that can be pressed against a rotating body 21 that rotates integrally with the vehicle wheel. The rotating body 21 is, for example, a brake disc. The greater the force with which the actuator unit 20 presses the friction material 22 against the rotating body 21, the greater the braking force that can be generated.

[0011] The electric braking device 10 includes an electric motor 12. In FIG. 1, a line along the axis of a motor shaft member 13 of the electric motor 12 is shown as a rotation axis C1. The direction in which the rotation axis C1 extends coincides with the axial direction of the motor shaft member 13. In other words, the axial direction of the motor shaft member 13 refers to both directions extending along the axis of the motor shaft member 13.

[0012] The actuator unit 20 includes a conversion mechanism 40 that converts the rotational motion of the electric motor 12 into 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, to which a friction material 22 is attached at the end facing the rotating body 21. The actuator unit 20 can move the piston 41, i.e., the friction material 22, by 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 moves by the linear motion is a direction in which the friction material 22 attached to the piston 41 approaches the rotating body 21. The other of the directions in which the piston 41 moves by the linear motion is a direction in which the friction material 22 attached to the piston 41 moves away from the rotating body 21.

[0013] The actuator unit 20 includes a transmission mechanism 30 that transmits the rotational motion of the electric motor 12 to a conversion mechanism 40. The transmission mechanism 30 may include a speed reduction mechanism. An example of the transmission mechanism 30 will be described.

[0014] As shown in Fig. 1, the transmission mechanism 30 is composed of a combination of gears and the like. The transmission mechanism 30 includes an input gear 31. The input gear 31 is attached to 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 attached to the output shaft member 39.

[0015] The transmission mechanism 30 may include an intermediate gear 32. The transmission mechanism 30 may include an intermediate shaft member 38 to which the intermediate gear 32 is attached. For example, the intermediate gear 32 includes a first gear portion 32a that can mesh with the input gear 31 and a second gear portion 32b that can mesh with the output gear 33. In the intermediate gear 32, the first gear portion 32a and the second gear portion 32b rotate integrally. In one example of the intermediate gear 32, as shown in FIG. 1 , the first gear portion 32a and the second gear portion 32b are integrally formed. For example, the transmission mechanism 30 may include a first intermediate gear corresponding to the first gear portion 32a that can mesh with the input gear 31 and a second intermediate gear corresponding to the second gear portion 32b that can mesh with the output gear 33. The multiple intermediate gears may be attached to the intermediate shaft member 38.

[0016] 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 in response to the rotation of the input gear 31. The output gear 33 transmits the rotation to the actuator unit 20 via an output shaft member 39. More specifically, the input gear 31 and the first gear portion 32a of the intermediate gear 32 mesh with each other, thereby transmitting the rotational motion of the electric motor 12 from the motor shaft member 13 to the intermediate shaft member 38. The second gear portion 32b of the intermediate gear 32 meshes with the output gear 33, thereby transmitting the rotational motion of the electric motor 12 from the intermediate shaft member 38 to the output shaft member 39. The output shaft member 39 is connected to a conversion mechanism 40. The output gear 33 rotates the output shaft member 39, thereby transmitting the rotational motion to the conversion mechanism 40. In FIG. 1, a line along the axis of the output shaft member 39 is indicated as an output axis C2.

[0017] Although FIG. 1 illustrates one intermediate gear 32, the transmission mechanism 30 may include multiple gears that contribute to the transmission of rotational motion between the input gear 31 and the output gear 33.

[0018] 1, the electric braking device 10 may include a braking force maintaining mechanism 50. The braking force maintaining mechanism 50 can maintain the braking force applied by the actuator unit 20. For example, the braking force maintaining mechanism 50 functions as a ratchet mechanism.

[0019] An example of a braking force maintenance mechanism 50 will be described. The braking force maintenance mechanism 50 includes a ratchet gear 51 attached to the motor shaft member 13. For example, the ratchet gear 51 is molded integrally with the input gear 31. As another example, the ratchet gear 51 may be attached to the motor shaft member 13 as a separate unit from the input gear 31. The braking force maintenance mechanism 50 includes an engagement portion 52 and an actuator 53. The engagement portion 52 has a pawl shape that meshes with the teeth of the ratchet gear 51. The actuator 53 can mesh the engagement portion 52 with the ratchet gear 51. The braking force maintenance mechanism 50 can prevent the ratchet gear 51 from rotating by meshing the engagement portion 52 with the ratchet gear 51. By preventing the ratchet gear 51 from rotating, the braking force maintenance mechanism 50 can maintain the braking force. The braking force maintenance mechanism 50 can release the maintenance of the braking force by releasing the meshing between the engagement portion 52 and the ratchet gear 51.

[0020] The electric braking device 10 includes a circuit unit 60. The circuit unit 60 has a processing circuit that controls the rotational motion of the electric motor 12. The circuit unit 60 includes a circuit board 61 and components mounted on the circuit board 61. For example, the circuit unit 60 is accommodated in the housing 11. FIG. 1 shows an example in which the circuit unit 60 is attached so that the rotation axis C1, which is a line along the axis of the motor shaft member 13, intersects with the circuit unit 60. More specifically, the circuit unit 60 is arranged so that the rotation axis C1 and the circuit board 61 are perpendicular to each other.

[0021] The electric braking device 10 may include a heat conducting member for dissipating heat from the circuit unit 60. For example, the heat conducting member may be attached in contact with the circuit unit 60 and the housing 11 so as to be interposed between the circuit board 61 and the housing 11.

[0022] <Circuit section> 1 shows small mounted components 62 as mounted components included in the circuit unit 60. The small mounted components 62 are components that are low in height from the surface of the circuit board 61. As shown in FIG. 1, the circuit unit 60 may also include large mounted components 63 as mounted components. The large mounted components 63 are components that are relatively high in height from the surface of the circuit board 61.

[0023] The mounted components of the circuit unit 60 may be mounted on either one surface or the other surface of the circuit board 61. Fig. 1 shows an example in which small mounted components 62 and large mounted components 63 are mounted on the surface of the circuit board 61 facing the electric motor 12.

[0024] Examples of the large mounted components 63 include connectors, heat sinks, capacitors, etc. Specific examples of connectors include headers, sockets, and plugs. The small mounted component 62 is, for example, a sensor portion of a rotation angle sensor for detecting the rotation angle of the motor shaft member 13. Fig. 1 shows an example in which a magnet 14, which is a detected portion constituting the rotation angle sensor, is attached to the motor shaft member 13. In this case, the small mounted component 62 is disposed in a position facing the magnet 14 as shown in Fig. 1. Other examples of the small mounted component 62 include a chip resistor and a surface-mounted integrated circuit.

[0025] <Transmission mechanism> The transmission mechanism 30 provided in the electric braking device 10 will now be described in more detail. 1, the input gear 31, the intermediate gear 32, and the output gear 33 are cylindrical gears. The motor shaft member 13, the intermediate shaft member 38, and the output shaft member 39 are arranged so that the axis of the motor shaft member 13, the axis of the intermediate shaft member 38, and the axis of the output shaft member 39 are parallel to each other.

[0026] 1, the intermediate gear 32 is attached such that the second gear portion 32b is located farther from the electric motor 12 than the first gear portion 32a in the axial direction of the intermediate shaft member 38. In other words, the output gear 33 is attached such that it is located farther from the electric motor 12 than the input gear 31 in the axial direction of the motor shaft member 13. In other words, the gears of the transmission mechanism 30 are arranged in mesh with each other so that the input gear 31 and the output gear 33 are lined up in order of proximity to the electric motor 12 in the axial direction of the motor shaft member 13.

[0027] 1, an accommodation section 19 for accommodating the circuit section 60 is provided within the housing 11 on the opposite side of the electric motor 12 from the input gear 31 in the axial direction of the motor shaft member 13. An accommodation section 19 is provided within the housing 11 on the opposite side of the electric motor 12 from the conversion mechanism 40 to the output gear 33.

[0028] <Circuit layout> The positional relationship between the circuit unit 60, the transmission mechanism 30, and the electric motor 12 will be described in detail using Figures 1 and 2. Figure 2 schematically shows the electric braking device 10. In Figure 2, the components of the transmission mechanism 30, excluding the input gear 31 and the output gear 33, are not shown.

[0029] A two-dot chain line representing an imaginary plane P1 is shown in Fig. 2. The imaginary plane P1 is an imaginary plane parallel to the circuit board 61 and intersects with the motor shaft member 13. That is, Fig. 2 illustrates one of the imaginary planes parallel to the circuit board 61 that intersects with the motor shaft member 13 as the imaginary plane P1.

[0030] 2 shows a two-dot chain line representing the specific plane P2. The specific plane P2 is an imaginary plane parallel to the circuit board 61 and passing through the circuit unit 60. For example, the specific plane P2 is an imaginary plane that passes through the mounted components of the circuit unit 60 without passing through the circuit board 61. An example of the specific plane P2 is an imaginary plane that passes through the large mounted components 63 of the circuit unit 60. The specific plane P2 may also be an imaginary plane that passes through the small mounted components 62 of the circuit unit 60.

[0031] The positional relationship between the circuit section 60 and the output gear 33 will be described. In the electric braking device 10, the output gear 33 is disposed so as to intersect with the specific plane P2. In other words, the mounted components and the output gear 33 are disposed on the specific plane P2. For example, the output gear 33 is disposed so that a surface of the output gear 33 that is perpendicular to the axis of the output shaft member 39 is parallel to the circuit board 61. In this case, as shown in FIG. 2, the output shaft C2 is perpendicular to the specific plane P2. Also, in this case, the output gear 33 can be disposed so that a surface of the output gear 33 that is perpendicular to the axis of the output shaft member 39 is on the specific plane P2.

[0032] The output gear 33 does not face the circuit unit 60 in the direction in which the output shaft C2 extends. In other words, the size of the circuit board 61 provided in the electric braking device 10 is such that the circuit board 61 and the output gear 33 do not face each other in the direction in which the output shaft C2 extends.

[0033] It is preferable that the output gear 33 does not protrude further from the electric motor 12 than the circuit board 61 in the axial direction of the motor shaft member 13 from the input gear 31 toward the circuit section 60 .

[0034] The positional relationship between the circuit section 60 and the input gear 31 will be described. In the electric braking device 10, the input gear 31 is disposed at a position offset from the circuit board 61 in the axial direction of the motor shaft member 13. For example, the electric motor 12, input gear 31, and circuit board 61 are arranged in this order in the axial direction of the motor shaft member 13. The input gear 31 faces the circuit unit 60 in the direction in which the rotation axis C1 extends.

[0035] The input gear 31 may face a mounted component mounted on the circuit board 61. In the example shown in Figures 1 and 2, a small mounted component 62 mounted on the circuit board 61 and the input gear 31 face each other in the axial direction of the motor shaft member 13. The input gear 31 may face the circuit board 61.

[0036] 1 and 2, the input gear 31 is preferably not opposed to a large mounted component 63 mounted on the circuit board 61 in the axial direction of the motor shaft member 13. In other words, the large mounted component 63 is preferably disposed in a position that does not intersect with the rotation axis C1.

[0037] In the electric braking device 10, even if the height of the large mounted component 63 from the surface of the circuit board 61 is changed, the large mounted component 63 can be arranged as follows. In other words, even if the size of the large mounted component 63 is changed, the large mounted component 63 can be arranged.

[0038] With regard to the large component 63, the end of the large component 63 that is farthest from the circuit board 61 can be said to be on the same plane as a plane that passes through a point on the rotation axis C1 and is perpendicular to the rotation axis C1. This point on the rotation axis C1 is, for example, a point between the input gear 31 and the circuit board 61. This point on the rotation axis C1 may be a point between the input gear 31 and the circuit board 61 that is close to the input gear 31, or a point between the input gear 31 and the circuit board 61 that is close to the circuit board 61. This point on the rotation axis C1 may be, for example, a point inside the input gear 31. In other words, the large component 63 and the input gear 31 may face each other in the direction perpendicular to the rotation axis C1. This point on the rotation axis C1 may be, for example, a point inside the motor shaft 13. In other words, the large component 63 and the motor shaft 13 may face each other in the direction perpendicular to the rotation axis C1. The point on the rotation axis C1 may be, for example, a point inside the electric motor 12. In other words, the large mounted component 63 and the electric motor 12 may face each other in a direction perpendicular to the rotation axis C1.

[0039] <Action and effect> The operation and effects of this embodiment will be described. In the electric braking device 10, by arranging the output gear 33 so that it intersects with the specific plane P2, the circuit unit 60 and the output gear 33 overlap in the direction of the rotation axis C1, which is perpendicular to an imaginary plane parallel to the circuit board 61. This overlap makes it difficult for the size of the electric braking device 10 to increase in the axial direction of the motor shaft member 13. By arranging the output gear 33 so that it intersects with the specific plane P2, it makes it difficult for the circuit unit 60 and the output gear 33 to be positioned apart from each other, for example, in the direction perpendicular to the surface of the circuit board 61. Therefore, it makes it difficult for the circuit unit 60 to be positioned apart from the electric motor 12 in the direction perpendicular to the surface of the circuit board 61. This makes it difficult for the size of the electric braking device 10 to increase in the axial direction of the motor shaft member 13.

[0040] In the electric braking device 10, the circuit section 60 can be housed within the housing 11. This makes it less likely that the electric braking device 10 will become large in the axial direction of the motor shaft member 13, compared to when a circuit board 61 having mounted components is housed in a case or the like separate from the housing 11 and attached to the outside of the housing 11.

[0041] In the electric braking device 10, a large mounted component 63 arranged on the surface of the circuit board 61 facing the electric motor 12 is arranged so as not to face the input gear 31. This makes it possible to arrange the large mounted component 63 while minimizing the increase in size of the electric braking device 10 in the axial direction of the motor shaft member 13.

[0042] In the electric braking device 10, the input gear 31 is disposed at a position offset from the circuit board 61 in the axial direction of the motor shaft member 13. Because the circuit section 60 and the input gear 31 face each other in the axial direction of the motor shaft member 13, the input gear 31 is not disposed in the direction in which the surface of the circuit board 61 expands. This makes it possible to prevent the electric braking device 10 from becoming larger in the direction in which the surface of the circuit board 61 expands. The direction in which the surface of the circuit board 61 expands corresponds to the direction perpendicular to the extension direction of the rotation axis C1.

[0043] (Example of change) This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0044] In the above embodiment, the electric motor 12, the input gear 31, and the circuit board 61 are arranged in this order in the axial direction of the motor shaft member 13. However, the positional relationship between the electric motor 12, the input gear 31, and the circuit board 61 is not limited to this. For example, a configuration such as that shown in FIG. 3 may also be used.

[0045] Fig. 3 shows the electric braking device 110. The electric braking device 110 is configured such that an input gear 131, an electric motor 112, and a circuit board 161 are arranged in this order in the direction in which a rotation axis C11, which is a line along the axis of a motor shaft member 113, extends. Fig. 3 illustrates small mounted components 162 and large mounted components 163 mounted on the circuit board 161.

[0046] In this electric braking device 110, the circuit board 161 and the electric motor 112 are also arranged so that an imaginary plane parallel to the circuit board 161 intersects with the rotation axis C11. Fig. 3 shows an imaginary plane P11 that intersects with the motor shaft member 113 among the imaginary planes parallel to the circuit board 161.

[0047] In the electric braking device 110 as well, the output gear 133 can be arranged so as to intersect with a specific plane P12, which is an imaginary plane parallel to the circuit board 161 and which passes through the circuit section 160.

[0048] 3 illustrates an output gear 133 that is disposed so as to intersect with a specific plane P12. A plane of the output gear 133 that is perpendicular to the axis of the output shaft member is disposed parallel to the circuit board 161. An output axis C12, which is a line along the axis of the output shaft member, is perpendicular to the specific plane P12.

[0049] 3, an example of a transmission mechanism 130 including an input gear 131 and an output gear 133 includes an intermediate gear portion 132 in which a gear that meshes with the input gear 131 and a gear that meshes with the output gear 133 are connected by a shaft that has a length in the axial direction of the motor shaft member 113. As in the example shown in FIG. 3, the length of the transmission mechanism 130 in the direction in which the output shaft C12 extends may be longer than the length of the electric motor 112.

[0050] In the above embodiment, an example was shown in which the specific plane P2 was an imaginary plane parallel to the circuit board 61 and passing through the mounted components. Instead of this, as illustrated in FIG. 3, an imaginary plane parallel to the surface of the circuit board 161 and passing through the circuit board 161 may be set as the specific plane P12. That is, as shown in FIG. 3, the output gear 133 and the circuit board 161 may be arranged on the specific plane P12. With this configuration, the circuit board 161 and the output gear 133 can be arranged side by side on the specific plane P12. This arrangement allows for greater flexibility in arranging components other than the circuit board and the output gear in the electric braking device.

[0051] In the above embodiment, as shown in Figures 1 and 2, the output gear 33 and the circuit unit 60 do not face each other in the direction in which the rotation axis C1 extends. However, the positional relationship between the output gear and the circuit unit is not limited to this. For example, a configuration such as that shown in Figure 4 may also be used.

[0052] FIG. 4 shows the electric braking device 210. As shown in FIG. 4, the output gear 233 of the transmission mechanism 230 may face the circuit unit 260 in the direction in which the output shaft C22 extends. For example, the output gear 233 may face the circuit board 261 in the direction in which the output shaft C22 extends. That is, the electric braking device 210 may be configured as follows. The circuit board 261 of the electric braking device 210 is enlarged compared to the circuit board 61 of the electric braking device 10 so that the circuit board 261 and the output gear 233 face each other in the direction in which the output shaft C22 extends, which is a line along the axial center of the shaft member of the output gear 233. In other words, in the electric braking device 210, the output gear 233 is disposed at a position offset from the circuit board 261 in the axial direction of the motor shaft member 213. In this modified example, the board area can be increased compared to the embodiment shown in FIGS. 1 and 2. Note that a member different from the output gear 233 and the circuit section 260 may be disposed between the output gear 233 and the circuit section 260. In this modified example, in order to hold an output shaft member of the output gear, a through hole may be provided in the circuit board 261, and the output shaft member passed through the through hole may be held by the housing.

[0053] In the electric braking device 210 shown in Fig. 4, the circuit board 261 and the electric motor 212 are also arranged so that an imaginary plane parallel to the circuit board 261 intersects with the rotation axis C21. Fig. 4 also shows an imaginary plane P21, which is one of the imaginary planes parallel to the circuit board 261 and intersects with the motor shaft member 213. The input gear 231 faces the small mounted component 262 in the extension direction of the rotation axis C21.

[0054] 4, a specific plane P22 is shown as an imaginary plane that is parallel to the circuit board 261 and passes through the large mounted component 263, which is taller than the small mounted component 262. According to this electric braking device 210, it is possible to ensure a space within the housing for making the circuit board 261 larger.

[0055] The transmission mechanism may have a mechanism in which the shaft of the input gear and the shaft of the output gear intersect. An example will be described with reference to FIG. FIG. 5 shows an electric braking device 310 equipped with a transmission mechanism 330. The transmission mechanism 330 includes a bevel gear configured by an input gear 331 and an output gear 333. That is, in the electric braking device 310, the rotation axis C31 and the output shaft C32 intersect. The rotation axis C31 and the output shaft C32 may be perpendicular to each other as shown in FIG. 5. In the electric braking device 310, the positional relationship between the electric motor 312, the input gear 331, and the circuit unit 360 is the same as in the electric braking device 10 of the above embodiment. FIG. 5 illustrates a small mounted component 362 and a large mounted component 363 mounted on the circuit board 361.

[0056] In this electric braking device 310, the circuit board 361 and the electric motor 312 are also arranged so that an imaginary plane parallel to the circuit board 361 intersects with the rotation axis C31. Fig. 5 shows an imaginary plane P31 that intersects with the motor shaft member 313 among the imaginary planes parallel to the circuit board 361.

[0057] In the electric braking device 310 as well, the output gear 333 can be arranged so as to intersect with a specific plane P32, which is an imaginary plane parallel to the circuit board 361 and which passes through the circuit section 360.

[0058] In the above modification, the transmission mechanism 330 has been exemplified, in which the rotation axis C31 and the output shaft C32 are configured to be perpendicular to each other. However, the transmission mechanism may be configured so that the rotation axis C31 and the output shaft C32 are in a twisted position. In other words, the transmission mechanism may include a hypoid gear. The transmission mechanism may also include a mechanism configured with a worm and a worm wheel.

[0059] The transmission mechanism may include a planetary gear mechanism. An example will be described with reference to FIG. 6 shows an electric braking device 410 that includes a transmission mechanism 430. The transmission mechanism 430 includes a planetary gear mechanism. Specifically, the transmission mechanism 430 includes an input gear 431 that corresponds to the sun gear. The transmission mechanism 430 includes an output gear 433. The output gear 433 corresponds to the planetary gear and the carrier. The transmission mechanism 430 includes a ring gear 432. The ring gear 432 is fixed.

[0060] 6 shows an example of a planetary gear mechanism in which the axis of the motor shaft member 413 and the axis of the output shaft member connected to the carrier of the output gear 433 are coaxial. In other words, the axis of the output shaft member is located on the rotation axis C41, which is a line along the axis of the motor shaft member 413.

[0061] The electric braking device 410 may include a circuit board 461 having a through hole 461a formed therein, as shown in Fig. 6. The transmission mechanism 430 may be inserted into the through hole 461a.

[0062] In this electric braking device 410, the circuit board 461 and the electric motor 412 are also arranged so that an imaginary plane parallel to the circuit board 461 intersects with the rotation axis C41. Fig. 6 shows an imaginary plane P41 that intersects with the motor shaft member 413 among the imaginary planes parallel to the circuit board 461.

[0063] In the electric braking device 410, the output gear 433 can be arranged so as to intersect with a specific plane P42, which is an imaginary plane parallel to the circuit board 461 and which passes through the circuit section 460.

[0064] In the configuration shown in FIG. 6, an example is shown in which mounted components 462 are attached to the surface of circuit board 461 opposite to the surface facing electric motor 412. 6, the input gear 431 is also disposed on the specific plane P42. That is, the input gear 431, the output gear 433, and the circuit board 461 are disposed so as to intersect with the specific plane P42.

[0065] In the above modified example, a configuration in which the transmission mechanism 430 is inserted into the through hole 461a formed in the circuit board 461 is exemplified. Instead of the circuit board 461 having the through hole 461a formed therein, a circuit board divided into multiple pieces can also be used. For example, all of the multiple circuit boards are arranged on the same plane. There may be a gap between adjacent circuit boards. A transmission mechanism can also be arranged between adjacent circuit boards.

[0066] A flat motor, such as the one shown in FIG. 6, can also be used as the electric motor. An electric motor having the following configuration is called a flat motor. A flat motor is flat in the direction along the axis of the motor shaft member. Specifically, the length of the electric motor is short in the direction along the axis of the motor shaft member. On the other hand, the length of the electric motor is long in the direction perpendicular to the axis of the motor shaft member.

[0067] In the above embodiment, the transmission mechanism 30 is configured such that the intermediate gear 32 is interposed between the input gear 31 and the output gear 33. However, the transmission mechanism may be configured such that the input gear and the output gear are directly engaged with each other.

[0068] In the above embodiment, the circuit unit 60 is disposed in the accommodation portion 19 inside the housing 11. However, it is not essential that the circuit unit 60 be disposed inside the housing 11. In the above embodiment, the input gear 31 and the circuit section 60 face each other in the axial direction of the motor shaft member 13. However, a member other than the input gear 31 and the circuit section 60 may be disposed between the input gear 31 and the circuit section 60.

[0069] In the above embodiment, the input gear 31 and the circuit unit 60 face each other in the axial direction of the motor shaft member 13. That is, the input gear 31 is disposed at a position offset from the circuit board 61 in the axial direction of the motor shaft member 13. It is not essential that the input gear 31 and the circuit unit 60 face each other. Furthermore, it is not essential that the motor shaft member 13 and the circuit unit 60 face each other. Regarding the positional relationship between the circuit board 61, the electric motor, and the input gear in the electric braking device, it is sufficient that the circuit board 61 and the electric motor 12 are disposed so that an imaginary plane parallel to the circuit board 61 intersects with the rotation axis C1.

[0070] In the above embodiment, as an example in which the rotation axis C1 intersects with the circuit unit 60, a configuration in which the rotation axis C1 intersects with the circuit board 61 at a right angle has been shown. However, the rotation axis C1 and the circuit board 61 may intersect at an angle. [Explanation of symbols]

[0071] 10…Electric braking device 11. Housing 12...Electric motor 13...Motor shaft member 19...Storage section 20...Actuator section 21...Rotating body 22...Friction material 30...Transmission mechanism 31...Input gear 32...Intermediate gear 33...Output gear 40...Conversion mechanism 60...Circuit section 61...Circuit board 62...Small mounting parts 63...Large mounted components P1: Virtual plane P2…Specific plane

Claims

1. an electric motor that rotates a motor shaft member; an actuator unit that can move a friction material in response to rotation of the motor shaft member of the electric motor and presses the friction material against a rotating body that rotates integrally with a wheel of a vehicle to generate a braking force on the wheel; a transmission mechanism for transmitting the rotational motion of the motor shaft member to the actuator unit, the transmission mechanism including an input gear that inputs the rotation of the motor shaft member, and an output gear that is configured to rotate in response to the rotation of the input gear and transmits the rotation to the actuator unit; an electric braking device including a circuit unit that controls the electric motor, the circuit unit being configured to include a circuit board and components mounted on the circuit board, the circuit board and the electric motor are arranged so that an imaginary plane parallel to the circuit board intersects with an axial direction of the motor shaft member, The output gear is disposed so as to intersect with a specific plane, which is a plane passing through the circuit portion, among the imaginary planes. Electric braking device.

2. The output gear and the circuit board are arranged so that a surface of the output gear perpendicular to the axial direction of the shaft member of the output gear is parallel to the circuit board. The electric braking device according to claim 1 .

3. the specific plane passes through the mounted component of the circuit unit, The output gear is disposed at a position offset in the axial direction of the motor shaft member with respect to the circuit board. The electric braking device according to claim 2 .

4. The circuit board is disposed to face the output gear. The electric braking device according to claim 3 .

5. The specific plane is a plane that passes through the circuit board of the circuit portion. The electric braking device according to claim 2 .

6. The input gear is disposed at a position offset from the circuit board in the axial direction of the motor shaft member, and the circuit board is disposed so as to face the input gear. The electric braking device according to any one of claims 2 to 5.

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