JP2007331674A - Vehicle braking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle braking device capable of efficiently radiating heat from electronic components requiring heat radiation without using a dedicated radiator or its plate, and of using a circuit board allowable for component arrangement. <P>SOLUTION: A brake control electronic control unit 102 has a control unit housing 4 housing the circuit board 102 on which an electronic circuit is formed and a coil carrier 104 holding coils 5a-5h to be used for solenoid selector valves 2a-2h. It is mounted on a hydraulic unit 101 to be integrated with the hydraulic unit 101. The coil carrier 104 is formed of a heat conductive member and mounted with a transistor 16 for heat radiation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle brake device, and more particularly to a vehicle brake device that reduces the installation space of a heat dissipating component such as a radiator while improving the heat dissipating efficiency of an electronic component.

Conventionally, as this type of brake device, a hydraulic master cylinder and a wheel cylinder are connected by hydraulic piping or the like, a plurality of electromagnetic switching valves are provided as appropriate, and a pump for returning brake fluid from the wheel cylinder to the master cylinder Generally known is a hydraulic type that is provided with means and the like and is configured to control the brake pressure by controlling the operation of the electromagnetic switching valve.
In such a brake device, the above-described electromagnetic switching valve, hydraulic piping, and the like are arranged in a block-shaped housing member called a hydraulic block and the like, and a microcomputer or the like is mainly formed on one surface of the hydraulic block. It is well known that the electronic control unit for brake control is mounted and the drive control of the electromagnetic switching valve disposed in the hydraulic block is performed (see, for example, Patent Document 1). .

  Incidentally, the electronic control unit for brake control has a circuit board on which electronic parts such as a microcomputer are mounted, and an electromagnetic switching valve is driven on the circuit board based on the control of the microcomputer. A drive circuit is often incorporated. Such a drive circuit is generally configured using a power transistor for energization drive to the electromagnetic switching valve, and for the heat dissipation of the power transistor and other electronic components that require heat dissipation. Conventionally, the radiator and the radiator plate are generally provided on the circuit board described above.

Japanese translation of PCT publication No. 2002-508276 (page 7-10, FIG. 1 to FIG. 8)

  However, the installation space for various mechanical parts and electronic parts is very limited, and in addition, in vehicles where there is a strong demand for further miniaturization of these parts and their arrangement space, circuits are used for heat dissipation of transistors and the like. Securing the installation space for heatsinks and heatsinks on the board puts pressure on the installation space for other electronic components, resulting in a circuit board with a very dense component layout, and the reliability of the circuit board There is a problem that it is difficult to ensure a sufficient margin in terms of safety and safety.

  The present invention has been made in view of the above circumstances, and enables efficient heat dissipation of an electronic component that requires heat dissipation without using a dedicated heat radiator or heat sink, and a circuit with a sufficient component arrangement. An object of the present invention is to provide a vehicle brake device that can use a substrate.

In order to achieve the above object of the present invention, a vehicle brake device according to the present invention includes:
A hydraulic unit having a passage through which brake fluid flows between the master cylinder and the wheel cylinder, at least one electromagnetic switching valve for switching the flow of the brake fluid, and drive control of the electromagnetic switching valve of the hydraulic unit A vehicle brake device comprising an electronic control unit for brake control.
The electronic control unit for brake control includes a circuit board on which an electronic circuit is formed and a coil carrier that holds a coil used for the electromagnetic switching valve. The coil carrier is attached to the hydraulic unit. Integrated with the hydraulic unit,
The coil carrier is made of a member having thermal conductivity, and an electronic component used for the electronic circuit that requires heat dissipation is attached to be able to dissipate heat.
In such a configuration, it is preferable that the hydraulic unit has a hydraulic housing using a member having thermal conductivity, and the hydraulic housing and the coil carrier have a portion to be joined to each other. .
Furthermore, the coil carrier uses a magnetic member having thermal conductivity, and is suitable as one that functions as a coil yoke.

According to the present invention, an electronic component that needs to be radiated is attached to a coil carrier that is housed together with a circuit board in a brake control electronic control unit and holds a coil of an electromagnetic switching valve. In addition, it is possible to efficiently dissipate heat with a coil carrier having a relatively large heat radiation area without providing a dedicated heat radiator or heat radiation plate.
Furthermore, unlike the prior art, there is no need to attach a dedicated radiator or heat sink to the circuit board, so that it is possible to realize a circuit board with a sufficient component arrangement as compared with the prior art.
In addition, by forming the hydraulic housing using a member having good thermal conductivity and joining the coil carrier, it is possible to dissipate heat generated in the coil carrier not only by the coil carrier but also by the hydraulic housing. The effect is that heat can be radiated more efficiently.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
The members and arrangements described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.
Initially, the structural example of the vehicle brake device in embodiment of this invention is demonstrated, referring FIG.
FIG. 1 shows an overall perspective view of the hydraulic unit 101 constituting the main part of the vehicle brake device and the brake control electronic control unit 102 attached to one surface side of the hydraulic unit 101 in an exploded state. .

  In the vehicle brake device according to the embodiment of the present invention, although not shown, the master cylinder and the wheel cylinder are connected by hydraulic piping, and the hydraulic pressure generated in the master cylinder in response to the operation of the brake operator, for example, the brake handle, is shown. This is a so-called hydraulic brake device having a known and well-known configuration that is configured to transmit to a wheel cylinder to obtain a braking force in the wheel cylinder.

The hydraulic unit 101 includes a hydraulic pipe (not shown) for connecting the master cylinder and the wheel cylinder as described above, and a plurality of electromagnetic switching valves 2a to 2h that are appropriately provided in the middle of the pipe to control the flow of brake fluid. Etc. are arranged.
The hydraulic unit 101 according to the embodiment of the present invention has a hydraulic housing 1 that has an alumite treatment and has a substantially rectangular parallelepiped appearance. The hydraulic housing 1 is formed with a passage (not shown) as hydraulic piping for allowing the brake fluid to flow therein, and a part of the hydraulic switching valve 2a˜ 2h is arranged to constitute a hydraulic circuit. In addition, the part which protrudes outside from the hydraulic housing 1 of this electromagnetic switching valve 2a-2h is located in the hollow part of the coil 5-5h mentioned later so that it may be known according to excitation of the coil 5-5h. It is displaced in the axial direction.
Further, on the surface opposite to the surface from which the electromagnetic switching valves 2a to 2h protrude, the motor 3 used in a motor-type hydraulic pump (not shown) has a rotating shaft 3a and connection terminals 3b and 3c connected to a hydraulic housing. It is assembled so as to be inserted into 1.

A brake control electronic control unit 102 is attached to the hydraulic unit 101 on the surface side from which the electromagnetic switching valves 2a to 2h protrude, as will be described later.
The brake control electronic control unit 102 performs operation control of the electromagnetic switching valves 2a to 2h, the motor 3 and the like, and performs so-called normal brake control, and also performs an antilock brake control function and the like.

The electronic control unit 102 for brake control in the embodiment of the present invention has a control unit housing 4, and operations such as normal brake control and antilock brake control as described above are performed in the control unit housing 4. A circuit board 103 provided with a control microcomputer (not shown), an interface circuit (not shown), and a circuit for driving the electromagnetic switching valves 2a to 2h is provided. Yes.
Further, in the control unit housing 4 in the embodiment of the present invention, the coil carrier 104 storing and holding the coils 5 to 5h of the electromagnetic switching valves 2a to 2h is stored together with the circuit board 103. (Details will be described later).

  The control unit housing 4 in the embodiment of the present invention is composed of a housing main body 4a and a lid 4b, and the housing main body 4a has the circuit board 103 described above. In addition, the lid body portion 4b is attached so as to cover one opening portion of the housing main body portion 4a. A more detailed configuration of the housing body 4a and the lid 4b will be described together with the configuration of the coil carrier 104 described below.

FIG. 2 is a longitudinal sectional view showing a mutual mounting structure of the hydraulic unit 101 and the brake control electronic control unit 102 around the coil carrier 104 in the embodiment of the present invention, and FIG. An overall perspective view of the coil carrier 104 is shown, and the structure of the coil carrier 104 will be described in detail below with reference to these drawings.
First, the housing main body 4a constituting the control unit housing 4 in the embodiment of the present invention has a substantially rectangular parallelepiped shape as a whole, has openings formed on two opposing surfaces, Is formed with a storage portion 6 as a storage space in which a coil carrier 104 and the like to be described later can be stored. The storage portion 6 has such a size that an appropriate space is secured between the coil carrier 104, which will be described later, and its inner peripheral wall (see FIG. 2). Note that the circuit board 103 and the coil carrier 104 are provided so as to close the openings in the two opposing openings of the housing main body 4a described above, as will be described later. In 2, the notation of symbols is omitted for each opening.
Further, the housing body 4a in the embodiment of the present invention has a connector portion 7 extending on one side in the longitudinal axis direction, and electrical connection between the circuit board 103 and an external device (not shown). (Refer to FIG. 1).

  The lid portion 4b has a rectangular parallelepiped shape with an overall outer fitting shape formed in a shallow bottomed cylindrical shape having one opening, and the peripheral edge portion 8 on the opening side is a housing body. It is configured to be fitted into a fitting groove 9a recessed in the peripheral end surface 9 of one opening portion of the portion 4a so as to cover the opening of the housing main body portion 4a (see FIG. 2). In FIG. 1, the illustration of the fitting groove 9a is omitted in order to simplify the drawing and make it easy to see.

On the other hand, the coil carrier 104 according to the embodiment of the present invention is formed in a substantially rectangular parallelepiped shape as a whole, while the inside thereof is formed in a hollow state and provided with the coil storage portion 11. Yes. The coil storage portion 11 is configured such that the coils 5 to 5h of the electromagnetic switching valves 2a to 2h can be stored at appropriate intervals. In particular, in the embodiment of the present invention, the coils 5 to 5h are housed and held in two rows of four (see FIGS. 2 and 3). The height of the coil storage portion 11 in the embodiment of the present invention (the vertical direction in FIG. 2) corresponds to the axial length of the coils 5 to 5h.
For the coil carrier 104, it is preferable to use a magnetic member having good thermal conductivity and good magnetic permeability.

  Since the coil carrier 104 in the embodiment of the present invention uses a member having a good thermal conductivity as described above, it is possible to promote the release of heat generated by energizing the coils 5 to 5h. It has become. In addition, since the coil carrier 104 has a good thermal conductivity as described above and uses a magnetic member having a good permeability, it functions as a yoke and increases the inductance of the coils 5 to 5h. It has become. In other words, the prior art has a structure in which windings are arranged in an annular cylindrical yoke made of a magnetic member for each coil, as disclosed in, for example, Patent Document 1 previously described in the description of the background art. However, the coil carrier 104 according to the embodiment of the present invention also serves as a conventional yoke for each coil as a whole.

In addition, through holes 13 of an appropriate size such that the end surfaces of the coils 5 to 5 h face the unit joint surface 12 a joined to the hydraulic unit 101 of the coil carrier 104 and the board facing surface 12 b facing the circuit board 103. Are respectively drilled (see FIG. 3). The illustration of the through hole 13 on the unit joining surface 12a side is omitted.
The coils 5 to 5h in the embodiment of the present invention have the bobbins 14 formed in a hollow cylindrical shape using a magnetic member, but the through holes 13 are hollow portions of the bobbins 14 ( (Not shown).
Further, on the unit joining surface 12 a side of the coil carrier 104, as will be described later, screwing ribs 15 for screwing with the hydraulic unit 101 are projected outward at appropriate positions. (See FIG. 3).

One of the side surfaces of the coil carrier 104 in the embodiment of the present invention, or a plurality of side surfaces as needed, is an electronic component that requires heat dissipation used in the electronic circuit of the circuit board 103, that is, specifically For example, the transistor 16 is joined by screwing at its mounting portion 16a (see FIG. 2).
That is, the transistor 16 is screwed to the coil carrier 104 so that the connection pin 16b protrudes from the position of the substrate facing surface 12b of the housing body 4a toward the circuit board 103 and can be connected to the circuit board 103. ing. Conventionally, the transistor 16 is attached to the circuit board 103 together with a dedicated heat sink (not shown). For this reason, conventionally, the arrangement space of other electronic components on the circuit board 103 is pressed, and the arrangement of the other components on the circuit board 103 is very small. However, the housing as in the embodiment of the present invention is used. By attaching the transistor 16 using the main body 4a as a radiator (or a heat sink), it is possible to direct the arrangement space of the heat radiator (or the heat sink) so far on the circuit board 103 to the arrangement space of other electronic components. Thus, it is possible to realize a spare part arrangement.

The coil carrier 104 has a large heat radiation area compared to a heat radiator (or a heat radiation plate) or the like normally used for heat radiation of the transistor 16, and the coil carrier 104 in the embodiment of the present invention is Since a member having a good thermal conductivity is used, heat can be radiated more efficiently than before.
Note that an insulating member 21 is interposed between the transistor 16 and the coil carrier 104.

On the other hand, the coils 5 to 5h are provided with connecting terminals 17 for electrical connection with an external circuit on one end face side in the axial direction so as to protrude in the axial direction of the coils 5 to 5h, respectively. Yes. When the coils 5 to 5 h are arranged in the coil carrier 104, the connection terminals 17 are arranged so as to protrude on the substrate facing surface 12 b side. In addition, in order to electrically insulate the coil carrier 104 and the connection terminal 17, an insulating member 17 a made of an insulating member is externally fitted at a portion where the connection terminal 17 penetrates the substrate facing surface 12 b (see FIG. 3).
The above-described coil carrier 104 has a housing main body 12a so that the unit joint surface 12a faces one opening side of the housing main body portion 4a, that is, the opening portion on the opposite side to the side where the lid portion 4b is attached. It is stored in the part 4a.

  Thus, when the coil carrier 104 is stored in the housing main body 4a, one opening of the housing main body 4a is covered with the unit joint surface 12a of the coil carrier 104 (see FIG. 2). In this state, the housing body 4a is placed such that the unit joint surface 12a of the coil carrier 104 is joined to the surface of the hydraulic unit 101 on the side from which the electromagnetic switching valves 2a to 2h protrude. The mounting screw 18 inserted into the hydraulic unit 101 from the opposite surface is screwed into the screwing rib 15 of the coil carrier 104, so that the housing body 4a and the coil carrier 104 and the hydraulic unit 101 are integrated. The assembled state is obtained (see FIG. 2).

Note that when the housing body 4a and the coil carrier 104 are placed on the hydraulic unit 101, the portions of the electromagnetic switching valves 2a to 2h that protrude from the hydraulic unit 101 have the corresponding bobbins 14 as described above. It can be loosely fitted into a hollow portion (not shown).
Since the unit joint surface 12a of the coil carrier 104 is joined to the hydraulic housing 1 in the embodiment of the present invention as described above, it is preferable to use a member having good thermal conductivity. Thus, the heat conducted from the coils 5 to 5 h and the transistor 16 to the coil carrier 104 can be radiated not only by the coil carrier 104 but also by the hydraulic housing 1.

On the other hand, the circuit board 103 is configured so that at least the coil carrier 104 is accommodated in the housing body 4a as described above, and then the other opening of the housing body 4a is covered with the opening of the housing body 4a. Two opposite end portions of the circuit board 103 are fitted into the step portion 19 formed on the periphery, and are attached to the housing main body portion 4a (see FIG. 2). In the embodiment of the present invention, in this state, in the depth direction of the housing body 4a (the vertical direction in FIG. 2) so that an appropriate space is generated between the coil carrier 104 and the circuit board 103. The size is set in advance.
When the circuit board 103 is attached to the housing body 4a as described above, the connection terminals 17 of the coils 5 to 5h and the connection pins 16b of the transistor 16 are formed in the corresponding through holes formed on the circuit board 103. (Not shown) and then soldered and fixed.

  In the embodiment of the present invention, the transistor 16 is screwed to the side portion of the coil carrier 104. However, the means for attaching the transistor 16 to the coil carrier 104 need not be limited to screwing. For example, an adhesive having good thermal conductivity may be used.

The space between the circuit board 103 and the coil carrier 104 or between the electronic component 20 such as an IC on the coil carrier 104 side of the circuit board 103 and the coil carrier 104 has, for example, good thermal conductivity and insulation. It is also preferable to fill with a gel-like filler.
In the above-described embodiment, the transistor 16 is attached to the side surface portion of the coil carrier 104. However, the present invention is not limited to this, and other parts of the coil carrier 104, for example, the circuit board 103 and the like. It is also preferable to attach to an appropriate part on the opposite surface.

  Furthermore, the shape and structure of the coil carrier 104 are not limited to the shape and structure described above.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view in a disassembled state of a hydraulic unit and a brake control electronic control unit that constitute a main part of a vehicle brake device in an embodiment of the present invention. It is a longitudinal cross-sectional view which shows the state by which the hydraulic unit and the electronic control unit for brake control were mutually assembled | attached. It is a whole perspective view of the coil carrier arrange | positioned in the electronic control unit for brake control.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hydraulic housing 2a-2h ... Electromagnetic switching valve 4 ... Control unit housing 5a-5h ... Coil 16 ... Transistor 101 ... Hydraulic unit 102 ... Brake control electronic control unit 103 ... Circuit board 104 ... Coil carrier

Claims (3)

A hydraulic unit having a passage through which brake fluid flows between the master cylinder and the wheel cylinder, at least one electromagnetic switching valve for switching the flow of the brake fluid, and drive control of the electromagnetic switching valve of the hydraulic unit A vehicle brake device comprising an electronic control unit for brake control.
The electronic control unit for brake control includes a circuit board on which an electronic circuit is formed and a coil carrier that holds a coil used for the electromagnetic switching valve. The coil carrier is attached to the hydraulic unit. Integrated with the hydraulic unit,
The said coil carrier consists of a member which has heat conductivity, The electronic component used for the said electronic circuit which requires the heat dissipation is attached, The vehicle brake device characterized by the above-mentioned.   2. The hydraulic unit includes a hydraulic housing using a member having thermal conductivity, and the hydraulic housing and the coil carrier have a portion to be joined to each other. Vehicle brake device.   The vehicle brake device according to claim 1 or 2, wherein the coil carrier uses a magnetic member having thermal conductivity and functions as a yoke of the coil.

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