Electronic control unit and brake control device

Abstract

To provide an electronic control unit and brake control device which are excellent in assembling workability.SOLUTION: In an electronic control unit 2, a holding piece 31 and a holding part are arranged on an intermediate wall part 24 of a housing 21. The holding piece 31 restricts movement of a coil assembly 40 to a front surface 24a side of the intermediate wall part 24. The holding part restricts movement of the coil assembly 40 to a rear surface 24b side of the intermediate wall part 24. The holding piece 31 is integrally formed on the intermediate wall part 24. The holding piece 31 includes an extension part 32 which extends from the position closer to the rear surface 24b side than the holding part toward the front surface 24a side, and a claw-shaped part 33 as an engagement part which is arranged on a tip end part of the extension part 32 and with which the coil assembly 40 can engage.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to an electronic control unit and a brake control device.

Background Art

[0002] Conventionally, a brake control device including an electronic control unit has been known (see, for example, Patent Document 1). In this brake control device, a leaf spring is interposed between an intermediate wall portion of a housing constituting the electronic control unit and a coil assembly for driving a solenoid valve. The coil assembly is elastically biased toward the base body by the leaf spring.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the process of manufacturing the brake control device of Patent Document 1, it is necessary to first assemble the coil assembly to the base body and then assemble the housing provided with the leaf spring to the base body in that state. That is, in the technology of Patent Document 1, since a sub-assembly in which the housing holds the coil assembly cannot be configured, there is a problem that the work of assembling the housing to the base body is complicated.

[0005] An object of the present invention is to provide an electronic control unit and a brake control device having excellent assembling workability.

Means for Solving the Problems

[0006] The electronic control unit according to the present invention devised to solve the above problems includes a coil assembly and a housing having an intermediate wall portion that holds the coil assembly. Further, the intermediate wall portion is provided with a holding piece that restricts the coil assembly from moving to one side of the intermediate wall portion and a holding portion that restricts the coil assembly from moving to the other side of the intermediate wall portion. The holding piece is integrally formed with the intermediate wall portion. The holding piece has an extending portion that extends from the other side toward the one side with respect to the holding portion, and an engaging portion provided at the tip of the extending portion with which the coil assembly can engage.

[0007] In this configuration, the movement of the coil assembly to the other side is restricted by the holding portion, and the movement to the one side is restricted by the holding piece having the extending portion. That is, the coil assembly is easily and reliably held by the housing's intermediate wall portion via the holding piece having an extending portion with a length sufficient for elastic deformation. Thereby, the detachment of the coil assembly from the intermediate wall portion can be prevented. Therefore, according to the present invention, a sub-assembly in which the coil assembly is held by the housing can be formed, and an electronic control unit with excellent assembly workability can be obtained.

[0008] Further, it is preferable that the engaging portion is a claw-shaped portion that protrudes in a direction approaching the central axis of the coil assembly from the tip of the extending portion. The claw-shaped portion has a contact surface that can contact the end surface of the coil assembly. In this configuration, by opposing the contact surface of the claw-shaped portion to be able to contact the end surface of the coil assembly, the coil assembly can be reliably held by the surface.

[0009] Further, it is preferable that the claw-shaped portion has a guide surface that inclines in a direction approaching the central axis of the coil assembly from the tip side of the claw-shaped portion toward the contact surface in the extending direction of the extending portion. In this configuration, when the coil assembly is attached to the housing, the coil assembly is guided along the guide surface while deflecting the holding piece outward. Thereby, the end surface of the coil assembly is smoothly guided to a position facing the contact surface of the claw-shaped portion. Therefore, the assembling workability is further improved.

[0010] Further, it is preferable that a plurality of the holding pieces are arranged around the coil assembly with the coil assembly as the center. In this configuration, the coil assembly can be held more stably on the intermediate wall portion.

[0011] Further, a concave portion that is recessed on the other surface side is provided in the intermediate wall portion, and it is preferable that the extending portion projects from the bottom surface of the concave portion toward the one surface side. By raising the extending portion from the bottom surface of the concave portion, it is possible to sufficiently secure the length of the extending portion of the holding piece even in a compact configuration. Therefore, the extending portion of the holding piece can be sufficiently elastically deformed.

[0012] Further, it is preferable that a predetermined space is formed between the extending portion and the wall surface of the intermediate wall portion located on the side opposite to the coil assembly with respect to the extending portion. In this configuration, a sufficient space can be secured for the extending portion to deform outward in the radial direction of the coil assembly. Therefore, for example, when the coil assembly is held by the housing, the coil assembly can be easily attached to the housing while sufficiently deforming the extending portion of the holding piece outward in the radial direction.

[0013] Also, in a state where the coil assembly abuts against the holding portion and movement to the other surface side is restricted, a predetermined clearance is preferably formed between the engaging portion of the holding piece and the coil assembly. In this configuration, variations in the dimensional accuracy of the coil assembly and the housing can be absorbed by the clearance, so that the coil assembly can be reliably held between the holding portion and the holding piece at the intermediate wall portion. On the other hand, when assembling the housing to the assembly target, the clearance disappears by bringing the coil assembly into contact with the assembly target and moving the coil assembly toward the engaging portion side. As a result, the coil assembly can be reliably engaged with the engaging portion. Therefore, the coil assembly is biased toward the assembly target by the elastic force of the holding piece and can be securely fixed by being sandwiched between the engaging portion of the holding piece and the assembly target.

[0014] Further, the brake control device according to the present invention includes the electronic control unit and a base body in which a brake fluid passage is formed. The housing is assembled to the base body such that the other surface side faces the base body, and the coil assembly is biased toward the base body by the elastic force of the holding piece. According to this invention, a brake control device excellent in assembly workability can be obtained.

Effects of the Invention

[0015] According to the present invention, an electronic control unit and a brake control device excellent in assembly workability can be obtained.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention will be described in detail with appropriate reference to the drawings. In this embodiment, the case where the electronic control unit is applied to a brake control device for a vehicle (hereinafter simply referred to as "brake control device") will be described as an example.

[0018] The brake control device is used for a four-wheel vehicle or the like, and controls the brake hydraulic pressure applied to the wheel cylinder of the wheel brake as appropriate to perform controls such as antilock brake control and behavior stabilization control.

[0019] In addition, the brake control device can be mounted not only on an automobile that uses only an engine (internal combustion engine) as a power source, but also on a hybrid automobile that uses a motor in combination, an electric automobile or a fuel cell automobile that uses only a motor as a power source, etc. Further, the brake control device can also be used for the brake system of a motorcycle, a three-wheeled vehicle, and an all-terrain vehicle (ATV).

[0020] FIG. 1 is an external perspective view showing a brake control device provided with an electronic control unit 2 according to an embodiment of the present invention. FIG. 2 is an external perspective view showing the brake control device when the electronic control unit 2 is positioned upward. For convenience of explanation, as shown in FIG. 1, the directions of up, down, left, right, front, and rear are set for the brake control device. However, the direction shown in FIG. 1 is only an example, and the actual installation direction of the brake control device is not limited to this.

[0021] As shown in FIGS. 1 and 2, the brake control device includes a base body 1, an electronic control unit 2 attached to the rear surface 1a of the base body 1, and an electric motor 3 attached to the front surface 1b of the base body 1.

[0022] The base body 1 is a metal part (a non-magnetic metal part, for example, made of an aluminum alloy) formed in a substantially rectangular parallelepiped shape. A cylinder hole (not shown) and a plurality of brake fluid passages are formed inside the base body 1. The brake fluid passage is a fluid passage for connecting a master cylinder (not shown), which is a hydraulic pressure source, and a wheel brake (not shown).

[0023] Among the respective surfaces of the base body 1, a plurality of electrical components (not shown) such as a solenoid valve 8 (see FIG. 10) and a pressure sensor are mounted on the rear surface 1a. Further, an inlet port 4 is formed on the front surface 1b, and an outlet port 5 is formed on the upper surface 1c of the base body 1. A pipe leading to the master cylinder is connected to the inlet port 4. Also, a pipe leading to the wheel brake is connected to the outlet port 5.

[0024] A pump hole 6 is formed on the side surface 1d of the base body 1. A plunger pump 6a is mounted in the pump hole 6. Further, a reservoir hole 7 is formed on the lower surface 1e of the base body 1. A reservoir 7a is mounted in the reservoir hole 7.

[0025] Note that the respective holes provided in the base body 1 communicate with each other directly or via the brake fluid passages.

[0026] The electric motor 3 serves as a drive source for the plunger pump 6a. The electronic control unit 2 is fixed to the rear surface 1a of the base body 1 in a state of covering an electrical component (not shown) protruding from the rear surface 1a. The electronic control unit 2 includes a housing 21 integrally formed of a resin material and a cover member 22 that closes an opening formed on the rear side of the housing 21. The cover member 22 is formed of a resin material or a metal material.

[0027] The housing 21 has a substantially rectangular shape. The housing 21 is attached to the rear surface 1a of the base body 1 via bolts 21a inserted through mounting holes 21b (see FIG. 3) provided on the peripheral edge. A seal member (not shown) is attached to the mounting surface of the housing 21.

[0028] FIG. 3 is a perspective view showing the electronic control unit 2 with the cover member 22 removed. FIG. 4 is a view of the electronic control unit 2 with the cover member 22 removed, seen from the rear.

[0029] As shown in FIGS. 3 and 4, the housing 21 has a peripheral wall portion 23 and an intermediate wall portion 24 formed inside the peripheral wall portion 23. The intermediate wall portion 24 is integrally formed with the peripheral wall portion 23 and partitions the space formed inside the peripheral wall portion 23 in the front-rear direction. As shown in FIG. 2, a control board P (shown by a broken line) is disposed in the space on the surface (rear surface) 24a side, which is one side of the intermediate wall portion 24. On the other hand, most of the coil assembly 40 is accommodated in the space on the back surface (front surface) 24b (see FIG. 10) side, which is the other side of the intermediate wall portion 24. The surface 24a is the surface of the intermediate wall portion 24 on the cover member 22 (see FIG. 2) side, and the back surface 24b is the surface of the intermediate wall portion 24 on the base body 1 (see FIG. 2) side.

[0030] A plurality of coil assemblies 40 are mounted on the intermediate wall portion 24. Each coil assembly 40 is held on the intermediate wall portion 24 in a non-removable state (a state where it cannot fall off) by the holding portion 30 and the holding piece 31. Each coil assembly 40 is mounted on a solenoid valve 8 (not shown in FIG. 3; see FIG. 10) attached to the base body 1 side and drives the solenoid valve 8. Examples of the solenoid valve 8 include a normally open type (normally open) solenoid valve and a normally closed type (normally closed) solenoid valve. The specifications of the solenoid valve 8 are appropriately set according to the configuration of the brake control device.

[0031] In addition, a sensor (not shown) is inserted through the intermediate wall portion 24. Examples of the sensor include a pressure sensor (hydraulic pressure sensor). The pressure sensor can detect the hydraulic pressure of the brake fluid flowing through the brake fluid passage in the base body 1.

[0032] FIG. 5 is a perspective view showing the housing 21 of the electronic control unit 2. FIG. 6 is a view of the housing 21 of the electronic control unit 2 seen from the rear.

[0033] As shown in FIGS. 5 and 6, a plurality of coil mounting holes 25 are formed in the intermediate wall portion 24 corresponding to the positions where the respective coil assemblies 40 (see FIG. 3) are mounted. The coil assemblies 40 are inserted through the coil mounting holes 25. Here, some of the plurality of coil mounting holes 25 partially overlap each other.

[0034] A plurality of bus bars (not shown) formed of a conductive material are embedded (molded) inside the intermediate wall portion 24. The ends of each bus bar are electrically connected to a connector 21c or the like provided on the housing 21.

[0035] On the surface 24a side of the intermediate wall portion 24, a restricting wall 27 with an arcuate inner surface is erected at the opening edge of the coil mounting hole 25. Also, at the opening edge of the coil mounting hole 25 located on the surface 24a side of the intermediate wall portion 24, holding portions 30 are provided at the circumferential ends of the respective restricting walls 27. Each terminal 46 (see FIG. 4) of the coil assembly 40 is arranged in this holding portion 30. When the terminal 46 is arranged in the holding portion 30, each coil assembly 40 is restricted from rotating circumferentially with respect to the coil mounting hole 25 by the restricting wall 27. Also, each coil assembly 40 is locked in a state where movement toward the back surface 24b side of the intermediate wall portion 24 is restricted by the holding portion 30.

[0036] FIG. 7 is a perspective view for explaining how the coil assembly 40 is mounted on the housing 21. As shown in FIG. 7, the coil assembly 40 is inserted into the coil mounting hole 25 from the surface 24a side of the intermediate wall portion 24.

[0037] FIG. 8 is a cross-sectional view taken along line A-A of FIG. 4 before the housing 21 is assembled to the base 1. FIG. 9 is a cross-sectional view taken along line B-B of FIG. 4 before the housing 21 is assembled to the base 1.

[0038] As shown in FIG. 8, the intermediate wall portion 24 is provided with a holding piece 31 that restricts the coil assembly 40 from moving to the surface 24a side of the intermediate wall portion 24. The holding piece 31 is integrally formed with the intermediate wall portion 24. The holding piece 31 has an extending portion 32 and a claw-shaped portion 33 as an engaging portion. The extending portion 32 extends from the back surface 24b side toward the surface 24a side relative to the holding portion 30 (see FIG. 9). Also, the claw-shaped portion 33 is provided at the tip of the extending portion 32 and is engageable with the coil assembly 40. Thereby, the coil assembly 40 is prevented from coming out to the surface 24a side.

[0039] The intermediate wall portion 24 is provided with a recess 26 (see also FIG. 4) that is recessed on the back surface 24b side. And the extending portion 32 of the holding piece 31 protrudes from the bottom surface of the recess 26 toward the front surface 24a side. A predetermined space S is formed between the extending portion 32 and the wall surface of the intermediate wall portion 24 located on the side opposite to the coil assembly 40 with respect to the extending portion 32.

[0040] The claw-shaped portion 33 is provided to protrude from the tip of the extending portion 32 in a direction approaching the central axis of the coil assembly 40. The shortest distance between the central axis of the coil assembly 40 and the claw-shaped portion 33 is set to be smaller than half (radius) of the outer diameter of the coil assembly 40.

[0041] The claw-shaped portion 33 has a contact surface 34 that can contact the end face of the coil assembly 40. The contact surface 34 is formed parallel to the front surface (mounting surface to the base 1) 21e of the housing 21. Further, the claw-shaped portion 33 has a guide surface 35. This guide surface 35 is inclined in a direction approaching the central axis of the coil assembly 40 from the tip side of the claw-shaped portion 33 toward the contact surface 34 in the extending direction of the extending portion 32. That is, the guide surface 35 is inclined in a direction away from the extending portion 32 from the back to the front.

[0042] A plurality of holding pieces 31 are arranged around the coil assembly 40 with the coil assembly 40 as the center. As shown in FIG. 4, in this embodiment, two holding pieces 31 are provided for one coil assembly 40. In this case, from the viewpoint of stable holding of the coil assembly 40, the circumferential angle between the positions where the two holding pieces 31 are provided is preferably 90 to 180 degrees. Moreover, it is more preferable that this angle is 180 degrees, that is, the two holding pieces 31 are arranged to face each other.

[0043] Figures 8 and 9 show the state in which the rear side where the cover member 22 of the housing 21 is attached is positioned upward. In this state, due to gravity, as shown in FIG. 9, the terminal 46 of the coil assembly 40 abuts against the holding portion 30, and the movement toward the back surface 24b side is restricted. Also, in this state, as shown in FIG. 8, a predetermined clearance C is formed between the claw-shaped portion 33 of the holding piece 31 and the coil assembly 40.

[0044] As shown in FIG. 8, the coil assembly 40 includes a bobbin 41 around which a winding is wound and a yoke 42 that surrounds the bobbin 41 and forms a magnetic path. The yoke 42 is composed of a yoke main body 42a and a yoke top 42b that is mounted and locked on the upper surface of the yoke main body 42a.

[0045] At the axial end of the coil assembly 40, as shown in FIGS. 4 and 7, a terminal 46 having a substantially rectangular shape when viewed from the rear is provided. A pair of terminal terminals 47 are provided on the terminal 46. Each terminal terminal 47 is electrically connected to the winding in the yoke main body 42a. Spring contacts (not shown) that function as connection terminals are respectively attached to the terminal terminals 47. Each spring contact is a coil spring formed of a conductive material, extends toward the control board P (see FIG. 2), and elastically contacts the terminal (not shown) of the control board P to be electrically connected.

[0046] The outer corner portions 48, 48 of the terminal 46 protrude so as to hang on the holding portion 30 provided at the opening edge of the coil mounting hole 25 located on the surface 24a side of the intermediate wall portion 24 when viewed from the rear, as shown in FIGS. 4 and 7. That is, when the coil assembly 40 is inserted into the coil mounting hole 25 from the surface 24a side of the intermediate wall portion 24 during assembly, the corner portions 48, 48 of the terminal 46 abut against the holding portion 30, and the coil assembly 40 is placed on the intermediate wall portion 24.

[0047] Next, the operation during the assembly of the housing 21 to the base 1 will be described. First, as shown in FIG. 7, the coil assembly 40 is mounted on the intermediate wall portion 24 of the housing 21. At this time, the coil assembly 40 is moved forward from the surface 24a side of the intermediate wall portion 24 toward the coil mounting hole 25.

[0048] When the coil assembly 40 approaches the coil mounting hole 25, the bottom surface or side surface of the coil assembly 40 abuts against the guide surface 35 of the claw-shaped portion 33 of the holding piece 31 provided on the intermediate wall portion 24. Thereby, the coil assembly 40 is guided along the guide surface 35. Further, when the coil assembly 40 is moved toward the coil mounting hole 25, due to the force applied to the guide surface 35 of the claw-shaped portion 33, the claw-shaped portion 33 moves radially outward of the coil assembly 40. As a result, the extending portion 32 is bent and deformed, and the tip side of the holding piece 31 is pushed open. In a state where the tip side of the holding piece 31 is thus pushed open, the coil assembly 40 is inserted into the coil mounting hole 25. Then, when the coil assembly 40 passes through the claw-shaped portion 33, the force applied to the claw-shaped portion 33 is removed, so that the claw-shaped portion 33 moves radially inward of the coil assembly 40 due to the elasticity of the extending portion 32. As a result, the tip side of the holding piece 31 that has been pushed open contracts radially inward and returns to its original state. As a result, as shown in FIG. 8, the contact surface 34 of the claw-shaped portion 33 is opposed to the end surface of the coil assembly 40. Therefore, the holding piece 31 restricts the movement of the coil assembly 40 toward the surface 24a side of the intermediate wall portion 24.

[0049] Also, as shown in FIG. 9, by inserting the coil assembly 40 into the coil mounting hole 25, the corners 48, 48 of the terminal 46 abut against the holding portion 30 provided on the intermediate wall portion 24. Thereby, the coil assembly 40 is temporarily held on the intermediate wall portion 24 in a state where it is prevented from falling off to the back surface 24b side.

[0050] In this way, each coil assembly 40 is sub-assembled to the housing 21. When the rear side of the housing 21 is positioned upward in this state, as shown in FIG. 8, each coil assembly 40 is drawn forward by gravity and held in a state of protruding slightly forward from the front surface 21e of the housing 21. On the other hand, each coil assembly 40 is movable in the axial direction of the coil mounting hole 25 so as to be substantially flush with the front surface 21e of the housing 21 against gravity.

[0051] When the electronic control unit 2 is attached to the base body 1, the electronic control unit 2 is positioned with respect to the base body 1 so that each solenoid valve 8 attached to the base body 1 is inserted into the corresponding coil assembly 40. Then, the electronic control unit 2 is attached to the base body 1 using bolts 21a.

[0052] FIG. 10 is a cross-sectional view taken along the line A-A of FIG. 4 after the housing 21 is assembled to the base body 1. FIG. 11 is a cross-sectional view taken along the line B-B of FIG. 4 after the housing 21 is assembled to the base body 1.

[0053] As shown in FIGS. 10 and 11, in a state where the housing 21 is assembled to the base body 1, each coil assembly 40 engages with a claw-shaped portion 33 provided at the tip of the extending portion 32 of the holding piece 31. That is, the coil assembly 40 is slightly moved rearward by receiving a reaction force from the base body 1, and the end face of the coil assembly 40 abuts against the contact surface 34 of the claw-shaped portion 33. At this time, each coil assembly 40 is biased toward the base body 1 by the elastic force of the holding piece 31 and is clamped and fixed between the claw-shaped portion 33 of the holding piece 31 and the base body 1. That is, each coil assembly 40 is held in a state of being in contact with the rear surface 1a of the base body 1 with a biasing force and being substantially flush with the front surface 21e of the housing 21. Thereby, each coil assembly 40 is arranged at a predetermined position of each solenoid valve 8.

[0054] On the other hand, by pushing the coil assembly 40 rearward while bending the holding piece 31 outward, the coil assembly 40 can be easily removed. Thereby, the housing 21 or the coil assembly 40 can be replaced.

[0055] As described above, in the electronic control unit 2 of the present embodiment, a holding piece 31 and a holding portion 30 are provided on the intermediate wall portion 24 of the housing 21. The holding piece 31 restricts the movement of the coil assembly 40 toward the surface 24a side of the intermediate wall portion 24, and the holding portion 30 restricts the movement of the coil assembly 40 toward the back surface 24b side of the intermediate wall portion 24. The holding piece 31 is integrally formed with the intermediate wall portion 24. Further, the holding piece 31 has an extending portion 32 that extends from the back surface 24b side toward the surface 24a side with respect to the holding portion 30, and a claw-shaped portion 33 provided at the tip of the extending portion 32 and engageable with the coil assembly 40 as an engaging portion.

[0056] In such a present embodiment, the movement of the coil assembly 40 toward the back surface 24b side is restricted by the holding portion 30, and the movement of the coil assembly 40 toward the surface 24a side is restricted by the holding piece 31 having the extending portion 32. That is, the coil assembly 40 is easily and reliably held to the intermediate wall portion 24 of the housing 21 via the holding piece 31 having the extending portion 32 with a length for sufficient elastic deformation. Thereby, the coil assembly 40 can be prevented from falling off from the intermediate wall portion 24. Therefore, according to the present embodiment, a sub-assembly in which the coil assembly 40 is held to the housing 21 can be formed, and thus an electronic control unit 2 excellent in assembling workability can be obtained.

[0057] The present embodiment has a structure in which the holding piece 31 and the holding portion 30 are directly provided on the intermediate wall portion 24. Therefore, metal parts such as a leaf spring for fixing the coil assembly 40 are not required. This leads to simplification of the retaining structure, reduction in size and weight, and contributes to downsizing and cost reduction of the housing 21. Further, for example, it is not necessary to adopt a mounting means for the coil assembly 40 using the peripheral wall portion 23 or the like of the housing 21. Therefore, for example, even in a layout in which the coil assembly 40 is arranged at a position away from the peripheral wall portion 23 or the like, the coil assembly 40 can be easily held using the holding piece 31 and the holding portion 30.

[0058] In addition, in the present embodiment, the engaging portion with which the coil assembly 40 can engage is a claw-shaped portion 33 provided so as to protrude from the tip of the extending portion 32 in a direction approaching the central axis of the coil assembly 40. The claw-shaped portion 33 has a contact surface 34 that can contact the end surface of the coil assembly 40. In this configuration, by opposing the contact surface 34 of the claw-shaped portion 33 to be in contact with the end surface of the coil assembly 40, the coil assembly 40 can be reliably held by the surface.

[0059] In addition, in the present embodiment, the claw-shaped portion 33 has a guide surface 35 that inclines in a direction approaching the central axis of the coil assembly 40 from the tip side of the claw-shaped portion 33 toward the contact surface 34 in the extending direction of the extending portion 32. In this configuration, when the coil assembly 40 is attached to the housing 21, the coil assembly 40 is guided along the guide surface 35 while bending the holding piece 31 outward. As a result, the end surface of the coil assembly 40 is smoothly guided to a position facing the contact surface 34 of the claw-shaped portion 33. Therefore, the assembling workability is further improved.

[0060] In addition, in the present embodiment, a plurality of holding pieces 31 are arranged around the coil assembly 40 with the coil assembly 40 as the center. In this configuration, the coil assembly 40 can be held more stably on the intermediate wall portion 24.

[0061] In addition, in the present embodiment, a concave portion 26 that is recessed toward the back surface 24b side is provided in the intermediate wall portion 24, and the extending portion 32 protrudes from the bottom surface of the concave portion 26 toward the front surface 24a side. By raising the extending portion 32 from the bottom surface of the concave portion 26, the length of the extending portion 32 of the holding piece 31 can be sufficiently ensured even in a compact configuration. For this reason, the extending portion 32 of the holding piece 31 can be sufficiently elastically deformed.

[0062] In addition, in the present embodiment, a predetermined space S is formed between the extending portion 32 and the wall surface of the intermediate wall portion 24 located on the side opposite to the coil assembly 40 with respect to the extending portion 32. With this configuration, a sufficient space can be ensured for the extending portion 32 to deform radially outward of the coil assembly 40. Therefore, for example, when the coil assembly 40 is held by the housing 21, the coil assembly 40 can be easily attached to the housing 21 while sufficiently deforming the extending portion 32 of the holding piece 31 radially outward.

[0063] In addition, in the present embodiment, with the coil assembly 40 in contact with the holding portion 30 and the movement toward the back surface 24b side being restricted, a predetermined clearance C is formed between the claw-shaped portion 33 of the holding piece 31 and the coil assembly 40. With this configuration, variations in the dimensional accuracy of the coil assembly 40 and the housing 21 can be absorbed by the clearance C, so that the coil assembly 40 can be reliably held by the holding portion 30 and the holding piece 31 on the intermediate wall portion 24. On the other hand, when assembling the housing 21 to the base body 1, by bringing the coil assembly 40 into contact with the base body 1 and moving the coil assembly 40 toward the claw-shaped portion 33 side, the clearance C disappears. As a result, the coil assembly 40 can be reliably engaged with the claw-shaped portion 33. Therefore, the coil assembly 40 is biased toward the base body 1 by the elastic force of the holding piece 31 and can be firmly fixed by being sandwiched between the claw-shaped portion 33 of the holding piece 31 and the base body 1.

[0064] The brake control device according to the present embodiment includes an electronic control unit 2 and a base body 1 in which a brake fluid passage is formed. The housing 21 is assembled to the base body 1 such that the back surface 24b side faces the base body 1, and the coil assembly 40 is biased toward the base body 1 by the elastic force of the holding piece 31. According to the present embodiment, a brake control device excellent in assembly workability can be obtained.

[0065] As described above, the present invention has been explained based on the embodiments. However, the present invention is not limited to the configurations described in the above embodiments, and the configuration can be appropriately changed without departing from the gist thereof. In addition, additions, deletions, and substitutions can be made to a part of the configuration of the above embodiments.

[0066] For example, in the above-described embodiment, a brake control device is exemplified that performs control such as antilock brake control and behavior stabilization control by appropriately controlling the brake hydraulic pressure applied to the wheel cylinder of the wheel brake. However, the brake control device according to the present invention is not limited thereto, and for example, it may be applied to an input device for a brake system.

[0067] Note that the input device for a brake system has a master cylinder in the housing that generates brake hydraulic pressure by the stepping force of the brake pedal. In addition, a stroke simulator or the like that applies a pseudo operating reaction force to the brake pedal can be provided in the housing. Examples of the brake system to which the input device for a brake system is applied include those having both a by-wire type that operates when the prime mover is started and a hydraulic type that operates when the prime mover is stopped or the like.

[0068] In the above-described embodiment, two holding pieces 31 are provided for one coil assembly 40, but the present invention is not limited thereto. One or three or more holding pieces 31 may be provided for one coil assembly 40.

[0069] In the above-described embodiment, the holding portion 30 is provided slightly protruding rearward from the surface 24a at the opening edge of the coil mounting hole 25, but the present invention is not limited thereto, and it may be flush with the surface 24a. In addition, although the terminal 46 of the coil assembly 40 abuts against the holding portion 30 and the movement toward the back surface 24b side is restricted, the present invention is not limited thereto, and other parts of the coil assembly 40 may abut against the holding portion 30.

[0070] In addition, in the above-described embodiment, the guide surface 35 of the claw-shaped portion 33 is configured by an inclined plane, but it is not limited thereto, and it may be configured by a curved surface or a combination of a plane and a curved surface.

[0071] In addition, in the above-described embodiment, one or two holding pieces 31 are erected on the bottom surface of one recess 26, but the bottom surface of the recess 26 may be formed wider so that three or more holding pieces 31 are erected on the bottom surface of one recess 26.

[0072] In addition, in the above-described embodiment, some of the plurality of coil mounting holes 25 partially overlap each other, but it is not limited thereto, and each coil mounting hole 25 may be provided separately and independently of each other.

Explanation of Reference Numerals

[0073] 1 Base 2 Electronic control unit 21 Housing 24 Intermediate wall portion 24a Surface (one surface) 24b Back surface (the other surface) 26 Recess 30 Holding portion 31 Holding piece 32 Extending portion 33 Claw-shaped portion (engaging portion) 34 Contact surface 35 Guide surface 40 Coil assembly 46 Terminal C Clearance S Space

Claims

1. A coil assembly, A housing having an intermediate wall portion for holding the coil assembly, and The intermediate wall portion is provided with a holding piece for restricting the coil assembly from moving to one side of the intermediate wall portion, and a holding portion for restricting the coil assembly from moving to the other side of the intermediate wall portion, The holding piece is integrally formed with the intermediate wall portion, and has an extending portion extending from the other side to the one side with respect to the holding portion, and an engaging portion provided at a tip end portion of the extending portion and engageable with the coil assembly. An electronic control unit characterized by that.

2. The engaging portion is a claw-shaped portion provided to project from a tip end portion of the extending portion in a direction approaching a central axis of the coil assembly and having a contact surface capable of contacting an end surface of the coil assembly. The electronic control unit according to claim 1, characterized by that.

3. The claw-shaped portion has a guide surface inclined in a direction approaching the central axis of the coil assembly from a tip end side of the claw-shaped portion toward the contact surface in an extending direction of the extending portion. The electronic control unit according to claim 2, characterized by that.

4. The electronic control unit according to any one of claims 1 to 3, characterized in that a plurality of the holding pieces are arranged around the coil assembly with the coil assembly as a center.

5. The intermediate wall portion is provided with a recess recessed on the other side, The electronic control unit according to any one of claims 1 to 4, characterized in that the extending portion projects from a bottom surface of the recess toward the one side.

6. The electronic control unit according to any one of claims 1 to 5, characterized in that a predetermined space is formed between the extending portion and a wall surface of the intermediate wall portion located on a side opposite to the coil assembly with respect to the extending portion.

7. The electronic control unit according to any one of claims 1 to 6, characterized in that a predetermined clearance is formed between the engaging portion of the holding piece and the coil assembly in a state where the coil assembly is in contact with the holding portion and movement to the other side is restricted.

8. A brake control device including the electronic control unit according to any one of claims 1 to 7 and a base body in which a brake liquid passage is formed, The housing is assembled to the base body such that the other side faces the base body. A brake control device characterized in that the coil assembly is biased toward the base by the elastic force of the holding piece.

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