Brake fluid pressure control device

Abstract

To provide a brake fluid pressure control device which can efficiently dissipate heat from a control board while suppressing increase in the size.SOLUTION: A brake fluid pressure control device 100 controls the brake fluid pressure acting on a wheel brake. The brake fluid pressure control device 100 includes: a base body 1; an electromagnetic valve 3; a first housing 21; and a control board 4. The base body 1 has a liquid channel formed therein. The electromagnetic valve 3 is attached to a rear surface 11a of the base body 1. The first housing 21 is fixed to a front surface 11b of the base body 1. The control board 4 is stored in the first housing 21. A heat transmission part 7 which comes into contact with both the base body 1 and the control board 4 is provided in the first housing 21.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a heat dissipation structure of a brake hydraulic control device.

Background Art

[0002] Conventionally, in a brake system of a vehicle such as a two-wheeled vehicle or a four-wheeled vehicle, there is known one provided with a brake hydraulic control device that controls the brake hydraulic pressure applied to a wheel brake. As the brake hydraulic control device, there is one including a base body in which a liquid passage is formed, and a solenoid valve attached to one surface of the base body and switching the flow of the brake fluid flowing through the liquid passage. An electronic control device is attached to one surface of the base body. The electronic control device includes a control board that controls the operation of the solenoid valve and a housing that houses the control board.

[0003] The control board is equipped with heat-generating electronic components such as a microcomputer. For this reason, various techniques for dissipating the heat of the control board on which the electronic components are mounted have been proposed (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Patent Document 1 discloses a configuration in which heat generated from electronic components is transmitted to a hydraulic housing (base body) via fastening means (bolts 18, 19), so that the heat of the control board can be dissipated through the base body. However, the fastening means disclosed in Patent Document 1 is arranged between multiple solenoid valves, with its head in contact with the control board. Therefore, it is difficult to secure space for arranging the fastening means, and furthermore, because the cross-sectional area of ​​the fastening means is limited, it is difficult to obtain sufficient heat dissipation. Furthermore, Patent Document 2 discloses a configuration in which, in order to obtain sufficient heat dissipation, a heat dissipation part is provided protruding from the base body and inserted into the housing of the electronic control device, and the heat dissipation part is in contact with the control board. However, in the technology disclosed in Patent Document 2, the solenoid valve is placed between the base and the control board, which necessitates a large protrusion of the heat dissipation section from the base, leading to an increase in the size of the base. Therefore, the object of the present invention is to provide a brake fluid pressure control device that can efficiently dissipate heat from the control board while suppressing an increase in size. [Means for solving the problem]

[0006] The present invention, for solving the aforementioned problems, is a brake fluid pressure control device for controlling the brake fluid pressure applied to a wheel brake. The brake fluid pressure control device comprises a base body, a solenoid valve, a first housing, and a control board. The base body has a fluid passage formed inside. The solenoid valve is mounted on one surface of the base body. The first housing is fixed to the other surface of the base body. The control board is housed within the first housing. A heat transfer section is provided within the first housing that contacts both the base body and the control board.

[0007] In this invention, by interposing the heat transfer section on a surface of the substrate different from the mounting surface of the solenoid valve, the contact area between the heat transfer section and the control board can be increased. This makes it possible to increase the amount of heat dissipated from the control board to the substrate via the heat transfer section. Furthermore, because the control board is positioned on a side of the substrate different from the mounting surface of the solenoid valve, the distance between the substrate and the control board is reduced. As a result, it is possible to avoid increasing the size of the heat transfer section, and consequently, an effective area for heat dissipation can be obtained without increasing the size of the substrate. In this way, the heat from the control board is transferred to the entire substrate via the heat transfer section. And since the substrate is placed in a large space such as an engine room, heat is efficiently dissipated from the substrate. As a result, even if the control board generates a large amount of heat, the heat from the control board can be sufficiently dissipated through the substrate. Therefore, according to the present invention, it is possible to provide a brake fluid pressure control device that can efficiently dissipate heat from the control board while suppressing an increase in size.

[0008] Preferably, the brake fluid pressure control device includes a second housing fixed to one surface of the base and covering the solenoid valve, and the first housing and the second housing are arranged opposite each other with the base in between.

[0009] In this configuration, by positioning the first and second housings on opposing surfaces rather than adjacent surfaces, the contact area between the heat transfer unit and the control board can be maximized. This makes it possible to increase the amount of heat dissipated from the control board.

[0010] The control board controls the operation of the solenoid valve, and the brake fluid pressure control device preferably includes a connection portion connecting the first housing and the second housing, with a busbar arranged within the connection portion to electrically connect the solenoid valve and the control board.

[0011] In this configuration, the solenoid valve and the control board that controls the operation of the solenoid valve can be easily electrically connected via a busbar.

[0012] The brake fluid pressure control device is preferably mounted on one surface of the base and includes a motor that drives a pump for pumping brake fluid.

[0013] In this configuration, the motor and heat transfer unit are not placed on the same plane of the base, allowing for a larger contact area between the heat transfer unit and the control board, thus increasing the amount of heat dissipated from the control board. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a brake fluid pressure control device that can efficiently dissipate heat from the control board while suppressing an increase in size. [Brief explanation of the drawing]

[0015] [Figure 1] This is a plan view showing a brake fluid pressure control device according to an embodiment of the present invention. [Figure 2] This is a perspective view showing a brake fluid pressure control device according to an embodiment of the present invention. [Figure 3] This is a schematic horizontal cross-sectional view of a brake fluid pressure control device according to an embodiment of the present invention. [Figure 4] This is a perspective view of the first housing with the first cover and control board removed from the perspective view in Figure 2, exposing the heat transfer section. [Modes for carrying out the invention]

[0016] Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings shown below, identical components are denoted by the same reference numerals, and redundant explanations are omitted as appropriate. When referring to the front, rear, left, right, up, and down directions of the brake fluid pressure control device, the directions shown in Figures 1 and 2 are used as reference points for the sake of explanation. However, the directions shown in Figures 1 and 2 are not intended to limit the front, rear, left, right, up, and down directions to those in use (when mounted on a vehicle, etc.).

[0017] FIG. 1 and FIG. 2 respectively show a plan view and a perspective view of a brake hydraulic control device 100 according to an embodiment of the present invention. The brake hydraulic control device 100 shown in FIGS. 1 and 2 is connected between a master cylinder (not shown) and wheel brakes and controls the brake hydraulic pressure applied to the wheel brakes.

[0018] The brake hydraulic control device 100 is suitably used for vehicles such as motorcycles, three-wheeled vehicles, all-terrain vehicles (ATVs), and four-wheeled vehicles. In the following, an example in which the brake hydraulic control device 100 is applied to a motorcycle (not shown) will be described, but it is not intended to limit the vehicle on which the brake hydraulic control device 100 is mounted.

[0019] The brake hydraulic control device 100 includes a base body 1 and an electrical component unit 2 assembled to the base body 1. Various sensors such as a solenoid valve 3 (see FIG. 3, the same applies hereinafter), a pressure sensor, etc. (not shown) corresponding to the brake system provided in the vehicle, and further a motor M (see FIG. 3, the same applies hereinafter), a pump P, etc. are assembled to the base body 1. The electrical component unit 2 functions as an electronic control device that detects the behavior of the vehicle body and controls the opening and closing of the solenoid valve 3 and the operation of the motor M.

[0020] FIG. 3 shows a schematic horizontal cross-sectional view of the brake hydraulic control device 100. As shown in FIG. 3, the solenoid valve 3 is attached to the rear surface (one surface) 11a of the base body 1 formed in a substantially rectangular parallelepiped shape. Here, two solenoid valves 3 are installed. The motor M is attached to the rear surface 11a of the base body 1. The motor M is installed on the side (here, the left side) of the solenoid valve 3. Note that the liquid passage and the like formed inside the base body 1 are not shown in FIG. 3.

[0021] As shown in Figures 1 to 3, the electrical component unit 2 comprises a first housing 21, a second housing 22, and a connecting portion 23. The first housing 21 is fixed to the front (other side) 11b of the base body 1, for example, by screw fastening. The second housing 22 is fixed to the rear (one side) 11a of the base body 1, for example, by screw fastening. The first housing 21 and the second housing 22 are positioned opposite each other with the base body 1 in between. The first housing 21, the second housing 22, and the connecting portion 23 are formed of a resin material.

[0022] The control board 4 is housed within the first housing 21. The control board 4 controls the operation of the solenoid valve 3 and motor M based on detection information obtained from various sensors (not shown) installed in the vehicle and pre-stored programs. The control board 4 is a rectangular circuit board body on which electronic components such as semiconductor chips are mounted, with electronic circuits (not shown) printed on it. The control board 4 also has electronic components mounted on it that control the fuel injection system (not shown), and controls the fuel injection system.

[0023] As shown in Figure 1, the first housing 21 comprises a first main body 21a that houses the control board 4 (see Figure 3, the same applies hereafter) and a first cover 21b. The first cover 21b closes an opening formed on the side of the first main body 21a opposite to the side facing the base 1. A connector portion 21c is integrally molded on the left rear side of the first main body 21a. The connector portion 21c is configured to be mateable with a mating connector portion to which a wire harness portion (not shown) is connected.

[0024] The second housing 22 comprises a second main body 22a that houses the coil assembly 5 (see Figure 3, the same applies hereafter) and a second cover 22b. The second cover 22b closes an opening formed on the side of the second main body 22a opposite to the side facing the base 1. In other words, the second housing 22 covers the solenoid valve 3 attached to the rear surface 11a of the base 1. The solenoid valve 3 switches the flow of brake fluid through the fluid passage, specifically opening and closing the fluid passage. The coil assembly 5 generates the magnetic force that drives the solenoid valve 3 and is arranged to surround the solenoid valve 3. The coil assembly 5 includes a solenoid coil formed by winding electric wire around a bobbin, a movable core, a fixed core, etc. The second housing 22 also covers the motor M attached to the rear surface 11a of the base 1. The motor M drives the pump P that pressurizes the brake fluid.

[0025] The connection section 23 connects the first housing 21 and the second housing 22. The connection section 23 is located on the outside of the base body 1. Inside the connection section 23 are a plurality of busbars 6 that electrically connect the solenoid valve 3 and the motor M to the control board 4, respectively. The busbars 6 have a first busbar 61 that extends in the front-rear direction within the connection section 23 and a second busbar 62 that extends in a direction perpendicular to the front-rear direction (for example, left-right direction) within the second housing 22. The front end of the first busbar 61 is electrically connected to the control board 4, for example, as a press-fit terminal. The rear end of the first busbar 61 is electrically connected to the second busbar 62, for example, by projection welding. The motor M and the coil assembly 5 are each electrically connected to the second busbar 62.

[0026] The connecting portion 23 has a first connecting portion 23a located on the first housing 21 side and a second connecting portion 23b located on the second housing 22 side. The first connecting portion 23a is integrally molded with the first housing 21, and the second connecting portion 23b is integrally molded with the second housing 22. The first connecting portion 23a and the second connecting portion 23b are connected by fitting the rear end of the first connecting portion 23a with the front end of the second connecting portion 23b. The first busbar 61 is, for example, embedded in the first connecting portion 23a and inserted through a through hole (not shown) formed in the second connecting portion 23b.

[0027] As shown in Figure 2, the base body 1 is a metal member that is roughly rectangular in shape. An inlet port (connection port) 12 and an outlet port (connection port) 13 are formed on the upper surface 11c of the base body 1. Inside the base body 1, there are fluid passages (not shown) through which brake fluid flows, a rotating shaft housing hole (not shown) for housing the rotating shaft of the motor M, a pump housing hole 14, and the like.

[0028] The pump housing hole 14 is formed to penetrate from the rotating shaft housing hole to the right side surface 11d of the base body 1. The pump housing hole 14 is provided to extend in the direction of the surface normal (perpendicular direction) to the right side surface 11d. In this case, the pump P is assembled through the pump housing hole 14 formed on the right side surface 11d of the base body 1. In addition, a solenoid valve mounting hole (not shown) for mounting a solenoid valve 3 is formed on the rear surface 11a of the base body 1 (see Figure 3), communicating with a liquid passage (not shown).

[0029] Piping (not shown) from a hydraulic source such as a master cylinder (not shown) is connected to the inlet port 12, and brake fluid is introduced from the hydraulic source. The inlet port 12 is also provided to communicate with a solenoid valve mounting hole via a fluid passage (not shown). Piping (not shown) leading to the wheel brake is connected to the outlet port 13, and this outlet port 13 is also provided to communicate with a solenoid valve mounting hole via a fluid passage (not shown).

[0030] A reservoir (not shown) is connected to a fluid passage (not shown) of the base 1. This reservoir temporarily stores the brake fluid that is released through a communication passage connected to the fluid passage of the base 1 when the solenoid valve 3 is opened during pressure reduction control of the wheel brakes.

[0031] Figure 4 is a perspective view of the first housing 21 with the first cover 21b and the control board 4 removed from the perspective view of Figure 2, exposing the heat transfer section 7. As shown in Figures 3 and 4, a heat transfer section 7 is provided inside the first housing 21 that contacts both the base body 1 and the control board 4. The heat transfer section 7 may be in contact with the main body of the control board 4, or it may be in contact with electronic components mounted on the main body of the board.

[0032] An opening 21d (see Figure 4) is formed in the portion of the first housing 21 facing the base body 1. A protrusion 15 is formed on the front surface 11b of the base body 1. The protrusion 15 extends from the front surface 11b of the base body 1 through the opening 21d toward the control board 4. In this embodiment, the heat transfer section 7 includes the protrusion 15. The base body 1 and the protrusion are formed by casting. That is, the protrusion 15 is formed integrally with the base body 1. It is desirable that the heat transfer section 7 includes a heat dissipation member such as a heat dissipation sheet or heat dissipation grease interposed between the protrusion 15 and the control board 4. This improves the adhesion between the heat transfer section 7 and the control board 4, thereby improving heat dissipation.

[0033] The brake fluid pressure control device 100 according to an embodiment of the present invention is basically configured as described above, and its operation and effects will be explained next.

[0034] In this embodiment, the brake fluid pressure control device 100 controls the brake fluid pressure applied to the wheel brakes. The brake fluid pressure control device 100 comprises a base body 1, a solenoid valve 3, a first housing 21, and a control board 4. The base body 1 has a fluid passage formed inside. The solenoid valve 3 is attached to the rear surface (one side) 11a of the base body 1. The first housing 21 is fixed to the front surface (other side) 11b of the base body 1. The control board 4 is housed inside the first housing 21 and controls the operation of the solenoid valve 3. A heat transfer section 7 is provided inside the first housing 21 that contacts both the base body 1 and the control board 4.

[0035] In this embodiment, by interposing the heat transfer section 7 on a surface of the base body 1 different from the mounting surface of the solenoid valve 3, the contact area between the heat transfer section 7 and the control board 4 can be increased. This makes it possible to increase the amount of heat dissipated from the control board 4 to the base body 1 via the heat transfer section 7. Furthermore, because the control board 4 is positioned on a side of the base body 1 different from the mounting surface of the solenoid valve 3, the distance between the base body 1 and the control board 4 is reduced. As a result, it is possible to avoid increasing the size of the heat transfer section 7, and consequently, an effective area for heat dissipation can be obtained without increasing the size of the base body 1. In this way, the heat from the control board 4 is transferred to the entire base body 1 via the heat transfer section 7. And since the base body 1 is placed in a large space such as an engine room, heat is efficiently dissipated from the base body 1. As a result, even if the control board 4 generates a large amount of heat, the heat from the control board 4 can be sufficiently dissipated through the base body 1. Furthermore, even if the control board 4 generates a large amount of heat when controlling the fuel injection system, the heat from the control board 4 can be efficiently dissipated. Therefore, according to this embodiment, it is possible to provide a brake fluid pressure control device 100 that can efficiently dissipate heat from the control board 4 while suppressing an increase in size. Furthermore, the brake fluid pressure control device 100 of this embodiment includes a second housing 22 fixed to the rear surface (one side) 11a of the base body 1 and covering the solenoid valve 3. The first housing 21 and the second housing 22 are arranged opposite each other with the base body 1 in between. In this configuration, by arranging the first housing 21 and the second housing 22 on opposing surfaces rather than adjacent surfaces, the contact area between the heat transfer unit 7 and the control board 4 can be maximized. This makes it possible to increase the amount of heat dissipated from the control board 4.

[0036] Furthermore, the brake fluid pressure control device 100 of this embodiment includes a connection section 23 that connects the first housing 21 and the second housing 22. A busbar 6 is arranged within the connection section 23 to electrically connect the coil assembly 5 that drives the solenoid valve 3 and the control board 4. In this configuration, the first housing 21 and the second housing 22 are connected by a connecting part 23, which allows for easy electrical connection between the coil assembly 5 that drives the solenoid valve 3 via the busbar 6 and the control board 4 that controls the operation of the solenoid valve 3.

[0037] Furthermore, in this embodiment, the connecting portion 23 is located on the outside of the base body 1. This configuration allows for suppression of increasing the size of the base 1. Furthermore, it does not impose any constraints on the degree of freedom in the layout of the liquid channels within the base 1. The connection part 23 may also be located inside the base body 1. Doing so can help to suppress the increase in size of the brake fluid pressure control device 100.

[0038] Furthermore, the brake fluid pressure control device 100 of this embodiment is attached to the rear surface (one side) 11a of the base and includes a motor M that drives a pump P for pumping brake fluid. In this configuration, the motor M and the heat transfer unit 7 are not arranged on the same plane, so the contact area between the heat transfer unit 7 and the control board 4 can be set to be larger. As a result, it becomes possible to increase the amount of heat dissipated from the control board 4.

[0039] Furthermore, in this embodiment, the heat transfer section 7 has a protruding portion 15 that extends from the front (other) surface 11b of the base body 1 toward the control board 4, and the protruding portion 15 is formed integrally with the base body 1. In this configuration, the protruding portion 15 of the heat transfer section 7 can be easily formed on the base body 1, and the heat transfer efficiency to the base body 1 via the heat transfer section 7 can be increased.

[0040] Although the present invention has been described above based on embodiments, the present invention is not limited to the configuration described in the embodiments, and its configuration can be modified as appropriate without departing from the spirit of the invention. Furthermore, some parts of the configuration of the embodiments can be added, deleted, or replaced.

[0041] For example, in the above embodiment, the protruding portion 15 of the heat transfer section 7 is formed integrally with the base body 1, but is not limited to this. The protruding portion 15 may be formed separately from the base body 1 from a material with good thermal conductivity such as metal, and may be fixed to the base body 1 by screw fastening, adhesive, welding, brazing, or the like.

[0042] Furthermore, while the shape and size of the heat transfer section 7 are rectangular parallelepipeds that are substantially inscribed within the opening 21d of the first housing 21 in the above embodiment, they are not limited to this. For example, the heat transfer section 7 may be cylindrical, or it may be approximately the same shape as the opening 21d. Moreover, the heat transfer section 7 may be divided into multiple parts.

[0043] Furthermore, although the above-described embodiment illustrates a brake fluid pressure control device 100 preferably used in motorcycles, the above-described technical matters may also be applied to brake fluid pressure control devices used in, for example, four-wheeled vehicles.

[0044] Furthermore, the control board 4 may also be one on which electronic components for adjusting the suspension damping force and ride height, or for controlling the transmission, etc., are mounted. [Explanation of Symbols]

[0045] 1 Base 11a Rear side (one side) 11b Front (other side) 15 Protrusion 2 Electrical component units 21 Housing 1 22 Second Housing 23 Connection part 3. Solenoid valve 4. Control board 5. Coil Assembly 6 Bus Bar 7 Heat transfer section 100 Brake hydraulic pressure control device M Motor P Pump

Claims

1. A brake fluid pressure control device that controls the brake fluid pressure applied to the wheel brakes, A substrate with a liquid channel formed inside, A solenoid valve attached to one side of the base, A first housing fixed to the other side of the base, The first housing comprises a control board housed within the first housing, A brake fluid pressure control device characterized in that a heat transfer portion is provided within the first housing that contacts both the base and the control board.

2. In the brake fluid pressure control device according to claim 1, The base is fixed to one surface and comprises a second housing that covers the solenoid valve, A brake fluid pressure control device characterized in that the first housing and the second housing are arranged opposite each other with the base body in between.

3. In the brake fluid pressure control device according to claim 2, The control board controls the operation of the solenoid valve, It includes a connecting portion that connects the first housing and the second housing, A brake fluid pressure control device is characterized in that a busbar is arranged within the connection portion to electrically connect the coil assembly that drives the solenoid valve and the control board.

4. In the brake fluid pressure control device according to claim 1, A brake fluid pressure control device characterized by being mounted on one surface of the base and comprising a motor that drives a pump for pressurizing brake fluid.

Images