WO2015114842A1

WO2015114842A1 - Brake control device

Info

Publication number: WO2015114842A1
Application number: PCT/JP2014/057055
Authority: WO
Inventors: 斎藤　博之
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2014-01-31
Filing date: 2014-03-17
Publication date: 2015-08-06
Also published as: JP2015143066A

Abstract

In a housing unit (4) are housed: a master cylinder (S) which generates brake fluid pressure by operation of a brake pedal; a motor (2) comprising a rotor (2a) which actuates a piston (12) within the master cylinder (S), and a stator (2b) provided on the outer peripheral side of the rotor (2a); and a control unit (3) comprising a circuit board (8), on which a driving element which performs drive control of the motor (2) is mounted. The housing unit (4) comprises a vehicle-body-side attachment part (5) which is attached and secured to a vehicle body panel, and which is extended through by the master cylinder (S). A motor housing part (6) which houses the motor (2), and a control unit housing part (7) which houses the control unit (3), are spaced apart from each other so as to project forward from the vehicle-body-side attachment part (5), thereby forming a gap portion (41).

Description

Brake control device

The present invention relates to a brake control device that controls an actuator applied to a brake system of an automobile.

As a brake control device for an actuator applied to a brake system mounted on a vehicle, for example, as in the configuration exemplified in Patent Document 1, a piston that mainly generates brake hydraulic pressure by operating a brake pedal is included. A housing unit (in Patent Document 1, the housing 2 and the like) includes a master cylinder, a motor that operates the piston, a torque conversion mechanism that converts motor generated torque into piston driving force, and a control unit that drives and controls the motor. What is accommodated in the housing unit) is known.

Both the motor and the control unit generate heat according to their operations, and if the temperature rises, the desired function may not be exhibited. Therefore, it is desirable to configure the brake control device so that the temperature rise can be suppressed. However, in a configuration in which the motor, control unit, etc. are housed in a mere housing unit, if the heat generated from the motor and control unit interferes with each other, the heat dissipation will be reduced, and the temperature rise will not be suppressed, and the desired function will be fully exhibited. There is a risk that it will not be possible.

JP 2012-71732 A

In view of the above circumstances, it is an object of the present invention to reduce thermal interference between heat generated from a motor and a control unit, to improve heat dissipation, and to suppress temperature rise in the motor and control unit. .

The brake control device of the present invention can solve the above-mentioned problems, and one aspect thereof is a master cylinder that generates brake fluid pressure by operating a brake pedal, a motor that operates a piston in the master cylinder, And a control unit having a circuit board on which a drive element for driving and controlling a motor is mounted is housed in a housing unit having a plurality of housing portions, and the housing unit is fixedly attached to a vehicle body, and the master cylinder passes therethrough. A motor housing portion that houses the motor and a control unit housing portion that houses the control unit are provided on the vehicle body side mounting portion so as to be separated from each other.

According to the present invention, it is possible to reduce the thermal interference between each heat generated from the motor and the control unit, to improve the heat dissipation, and to suppress the temperature rise in the motor and the control unit.

The perspective view which shows an example of the brake control apparatus of this embodiment. The top view of the brake control apparatus of FIG. 1 (plan view from the ceiling direction). FIG. 2 is a partial cross-sectional view (XX cross-sectional view) of the control device of FIG. 1. FIG. 2 is an exploded view of the brake control device of FIG. 1. The perspective view which shows the other examples of the brake control apparatus of this embodiment. FIG. 6 is a partial cross-sectional view (XX cross-sectional view) of the brake control device of FIG. 5. FIG. 6 is an exploded view of the brake control device of FIG. 5. The exploded view which shows an example of a housing unit.

The brake control device according to the embodiment of the present invention is not mounted in a mere housing unit, for example, as in Patent Document 1, but is mounted and fixed on the vehicle body, and is mounted on the vehicle body side through which the master cylinder passes. A housing unit having a configuration in which a motor housing portion that houses the motor and a control unit housing portion that houses the control unit are provided apart from each other. In order to separate the motor housing portion and the control unit housing portion from each other in this manner, for example, a gap is formed between the motor housing portion and the control unit housing portion.

According to the brake control device having such a configuration, the heat generated by driving the motor or the like (hereinafter referred to as motor heat) is radiated to the outer peripheral side (atmosphere side) of the motor housing, and the motor housing The heat is dissipated through a heat transfer path (hereinafter referred to as a motor heat path) from the vehicle body side mounting portion side (and the vehicle body side). Further, heat generated by driving the control unit or the like (hereinafter referred to as control unit heat) is radiated to the outer peripheral side (atmosphere side) of the control unit housing portion, and from the control unit housing portion to the vehicle body side mounting portion side. The heat is dissipated through a heat transfer path (hereinafter referred to as a control unit heat path) to (and the vehicle body side). When a gap is formed between the motor housing and the control unit housing, the heat interference between the motor heat path and the control unit heat path that can occur between the motor heat path and the control unit heat path is suppressed, and good heat dissipation is achieved. Sex will be obtained.

This can suppress the temperature rise of the motor and control unit. Moreover, if the temperature rise can be suppressed as described above, there is a possibility that it can contribute to sufficiently exhibiting the functions of the motor and the control unit.

As described above, the brake control device according to the present embodiment includes a housing unit having a configuration in which the motor housing portion and the control unit housing portion are separated from each other (for example, a space portion is formed between the motor housing portion and the control unit housing portion). Any one can be used as appropriate, and can be appropriately changed by applying techniques generally known in various fields such as the brake system field for automobiles and the housing molding field. An example is given. Note that the directions of “heaven”, “ground”, “front”, and “rear” indicated by arrows in the drawings according to the specific examples indicate the brake control device when the brake control device is mounted in the engine room of the vehicle. It indicates the centered direction, and indicates the vehicle ceiling direction, ground direction, front direction, and rear direction, respectively.

[Example of brake control device]
The brake control device 10A shown in FIGS. 1 to 4 shows an example applied to, for example, a brake system mounted in the engine room of a vehicle. (E.g., extending through a vehicle body panel (not shown) between the brake pedal and the engine room, and a vehicle body side mounting portion 5 described later), and the brake hydraulic pressure is reduced by operating the brake pedal. Torque conversion for converting a motor generated torque into a piston propulsive force, a motor 2 having a master cylinder S including a piston 12 to be generated, a rotor 2a and a stator 2b provided on the outer peripheral side of the rotor 2a. A mechanism H and a control unit 3 having a circuit board 8 (details will be described later) on which a drive element (details will be described later) for driving and controlling the motor 2 are mounted. Description section (FIGS. 1 to 4 the body side mounting portion 5 below the motor housing portion 6, the control unit housing portion 7) is constituted by accommodating in a housing unit 4 having a.

The housing unit 4 has a vehicle body side mounting portion 5 that is attached and fixed to a vehicle body panel (for example, a vehicle body panel between the brake pedal and the engine room) that is not shown in the figure and that contains the torque conversion mechanism H, and accommodates the motor 2. The motor housing portion 6 and the control unit housing portion 7 that houses the control unit 3 are provided so as to be spaced apart from each other and protrude forward from the vehicle body side mounting portion 5. As a result, a gap 41 is formed between the motor housing 6 and the control unit housing 7, and there is a thermal interference between the motor heat and the control unit heat that can occur between the motor heat path and the control unit heat path. Will be suppressed.

The housing unit 4 only needs to include the vehicle body side mounting portion 5, the motor housing portion 6, the control unit housing portion 7 and the like as described above, and the manufacturing method thereof is not particularly limited. As a specific example, the vehicle body side mounting portion 5, the motor housing portion 6, and the control unit housing portion 7 are molded by appropriately using known metal materials and resin materials, and the vehicle body side mounting portion 5 and the

housing portions

6 and 7 are formed. The method of assembling and integrating is mentioned. When the resin material is appropriately applied to the vehicle body side attachment portion 5 and the

housing portions

6 and 7, it is possible to contribute to reduction in manufacturing cost and weight reduction.

The vehicle body side mounting portion 5 of the housing unit 4 surrounds a substantially rectangular bottom wall 51 containing a torque conversion mechanism H that transmits a motor-generated torque and converts it into a propulsive force of the piston 12, and surrounds the four sides of the bottom wall 51. And a peripheral wall 52 that protrudes in the forward direction in FIGS. 1 to 4 and has an opening (for example, in the motor housing portion 6 provided in the vehicle body side mounting portion 5 or in the control unit). An opening 52a that is open so as to communicate with the inside of the accommodating portion 7 is formed, and has a substantially rectangular shape in plan view. A part of the outer peripheral side of the bottom wall 51 (a part on the ground side in FIGS. 1 to 4) bulges in the outer peripheral direction (a rearward direction in FIGS. 1 to 4) and is fixed to a vehicle body panel outside the figure. The bulging part 53 to be formed is formed.

In such a vehicle body side mounting portion 5, the bulging portion 53 side is fixed to the vehicle body panel, and the input rod 13 connected to the piston 12 penetrates the bulging portion 53 with respect to the rotor 2 a of the motor 2. The rotary motion of the rotor 2a of the motor 2 which is arranged so as to extend at a non-coaxial position and is operated by pressing the brake pedal is converted into a linear motion in the axial direction of the piston 12 in the master cylinder S, and A well-known rotation-linear motion conversion mechanism (for example, a belt, pulley, gear mechanism, or the like appropriately applied) that can linearly move the piston 12 accommodated in the cylindrical wall 11 of the cylinder S in the axial direction; Is omitted).

The input rod that has penetrated the bulging portion 53 as described above is led out to the rear side of the bulging portion 53 (that is, led out to the vehicle interior side) and connected to the brake pedal. In addition to the hydraulic tank 14 for storing the brake fluid to be filled in the cylindrical wall 11, the master cylinder S has an instrumentation piping section (not shown) for monitoring the pressure of the cylindrical wall 11. A braking pipe (not shown) for discharging the braking pressure (the brake fluid pressure) generated by the operation of the piston 12 in the cylindrical wall 11 is provided.

The motor housing portion 6 has a bottomed cylindrical partition wall 61 having an opening 61 a opened at the rear side (for example, opened so as to communicate with the inside of the vehicle body side mounting portion 5), and houses the motor 2 in the partition wall 61. The opening 61 a side of the partition wall 61 faces the opening 52 a side of the vehicle body side mounting portion 5, and the output shaft 2 c of the rotor 2 a of the motor 2 is non-coaxial with respect to the master cylinder S. In a posture that extends (in FIG. 1 to FIG. 4, extends non-coaxially on the ceiling direction side than the master cylinder S), it is provided so as to protrude forward from the vehicle body side mounting portion 5. The output shaft 2c of the rotor 2a is connected to the rotation-linear motion conversion mechanism.

The control unit accommodating portion 7 has a box shape capable of accommodating a flat circuit board 8 to be described later, and has a substantially rectangular bottom wall 71a and a peripheral wall 71b protruding so as to surround four sides of the bottom wall 71a. A case 71 having a housing opening 71d opened on the projecting direction side of the peripheral wall 71b, and a flat cover 72 attached to the opening side of the case 71 and sealing the inside of the case 71. The bottom wall 71a side of the case 71 is opposed to the motor housing portion 6 at a position separated from the motor housing portion 6 (for example, separated from the partition wall 61 of the motor housing portion 6 in the left-right wheel direction), and one side of the peripheral wall 71b is the opening of the vehicle body side mounting portion 5 A gap 41 is formed between the motor accommodating portion 6 and the control unit accommodating portion 7 so as to protrude forward from the vehicle body side attaching portion 5 in a posture facing the portion 52a side.

In such a control unit housing portion 7, for example, a structure that is provided so as to protrude from the vehicle body side mounting portion 5 at a position separated from the motor housing portion 6 and integrated with the vehicle body side mounting portion 5 can be mentioned. (For example, one side of the peripheral wall 71b of the case 71 and the vehicle body side mounting portion 5 side of the master cylinder S or the motor housing portion 7 are integrated). Even if it exists, the space | gap part 41 should just be formed between the motor accommodating part 6 and the control unit accommodating part 7. FIG.

In the mounting structure of the case 71 and the cover 72, for example, as shown in FIG. 3, a fitting groove 71c continuous in the circumferential direction of the peripheral wall 71b is formed on the distal end side of the peripheral wall 71b. By forming a projecting portion 72a at a position opposite to 71c and fitting the both so that a sealing material (not shown) is appropriately interposed between the fitting groove 71c and the projecting portion 72a. In addition, it is possible to improve the attachment and adhesion of the case 71 and the cover 72. The sealing material is not particularly limited. For example, specific examples of the sealing material having fluidity include an epoxy system, a silicone system, an acrylic system, and the like, and can be freely selected according to the specifications of the control unit 3. be able to. Further, the sealing material does not need to be fully filled in the fitting groove 71c, and when the protruding portion 72a of the cover 72 is inserted into the sealing material in the fitting groove 71c, for example, the protruding portion 72a and the fitting groove It suffices that the sealing material is sufficiently filled to such an extent that the sealing performance between 71c can be maintained.

In the control unit housing portion 7, for example, a communication port 79 communicating with the vehicle body side mounting portion 5 is formed on the vehicle body side mounting portion 5 side of the control unit housing portion 7, and the inside of the vehicle body side mounting portion 5 is communicated from the communication port 79. Accordingly, a cable or the like (not shown) that electrically connects the current supply terminal 84 of the circuit board 8 accommodated in the control unit accommodating portion 7 and the motor 2 can be disposed.

Reference numeral 77 denotes a heat dissipating fin having a plurality of fin-like members 77a to facilitate the release of heat from the control unit housing portion 7, and protrudes from the outer peripheral side surface of the cover 72 in FIGS. Is provided. The heat dissipating fins 77 are not particularly limited as long as they can dissipate the heat of the control unit housing portion 7. The circuit board 8 can be formed in a position close to the element 83 or the like, or formed in the case 71 like a brake control device 10B described later. A main circuit 81 is constructed on a component mounting surface 80a and / or 80b on one end surface side of the circuit board 8, for example, which is a board (for example, a thin board made of a synthetic resin material). The main circuit 81 includes at least a control unit (for example, a microcomputer) 82 that outputs a control signal of the motor 2, a drive element 83 that outputs a drive signal based on the control signal to the energization terminal 84, and the like. Functions as an inverter circuit. The energization terminal 84 is a terminal for supplying a drive signal received from the drive element 83 to the motor 2 and is electrically connected to the motor 2 via, for example, the cable described above. Further, the component mounting surface 80a and / or 80b includes a relay circuit, a MOSFET, a shunt resistor, a common mold coil, a normal mode coil, an electrolytic capacitor, and the like, which are components of the filter electronic circuit, so as to be electrically connected to the main circuit 81. It has been.

A technique for fixing the circuit board 8 in the control unit housing portion 7 is not particularly limited. For example, a fixing column 85 is formed at a position facing the peripheral edge of the circuit board 8 in the cover 72. Then, fixing holes 86 (holes through which the fixing columns 85 can be inserted) 86 are formed at positions facing the respective fixing columns 85 on the circuit board 8, thereby fixing the circuit substrate 8. The method of fixing to the cover 72 through the support | pillar 85 and each fixing hole 86 is mentioned.

In addition, a desired clearance (detailed description is omitted) is provided between the case 71 and the cover 72 of the control unit housing portion 7 and the circuit board 8, or an elastic member or the like is interposed in the clearance to perform control. You may aim at suppression of the vibration, impact, etc. which may occur with respect to the circuit board 8 from the unit accommodating part 7. FIG. Further, a heat conductive member is interposed in the clearance, for example, a sheet-like heat conductive member or a well-known heat dissipating material (such as heat dissipating grease or heat dissipating adhesive) is controlled from the circuit board 8. The heat conductivity with respect to the unit housing portion 7 may be improved, and the heat dissipation from the control unit housing portion 7 may be improved.

For example, as shown in FIG. 1, the connector 87 includes a plurality of terminals 87 a that penetrate the cover 72 and electrically connect an external device (not shown) to the main circuit 81 of the circuit board 8, and the outer periphery of the cover 72. On the side, a fitting portion 87b that protrudes so as to surround each terminal 87a and can be fitted to an external device connector (not shown) is provided.

[Other examples of brake control device]
The brake control device 10B shown in FIGS. 5 to 7 shows another example applied to a brake system mounted on a vehicle. Note that the same (or similar) components as those of the brake control device 10A described above are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

The brake control device 10B is configured by housing the master cylinder S, the motor 2, and the control unit 3 in the housing unit 4 as in the brake control device 10A. An air gap 41 is formed between the part 6 and the control unit housing part 7, and it is possible to suppress thermal interference between the motor heat and the control unit heat that may occur between the motor heat path and the control unit heat path. It has become a structure.

As shown in FIGS. 5 to 7, the control unit housing portion 7 of the brake control device 10 </ b> B has a configuration in which radiating fins 78 are formed in the case 71 instead of forming the radiating fins 77 in the cover 72. The heat dissipating fins 78 have a plurality of fin-like members 78a to facilitate the release of heat from the control unit accommodating portion 7. In FIGS. It is provided so as to protrude from the outer peripheral side surface. The heat radiating fins 78 are not particularly limited as long as the heat radiating fins 77 have a structure that can radiate the heat of the control unit housing portion 7. For example, a portion of the case 71 where the circuit board 8 easily radiates heat (for example, For example, it may be formed at a position close to a control unit 82 or a drive element 83 described later.

Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various modifications can be made within the scope of the technical idea of the present invention. It is natural that such changes and the like belong to the scope of the claims.

For example, the invention according to claim 1 or 2 is capable of suppressing the temperature rise in the motor and the control unit by reducing the heat interference of each heat generated from the motor and the control unit and improving the heat dissipation. If there are, various changes can be made. In the concrete example according to the first or second aspect of the invention, for example, in the case of the

brake control devices

10A and 10B shown in FIGS. 1 to 8, in the housing unit 4, particularly as shown in FIGS. The case 71 and the motor housing portion 6 are integrated in advance on the vehicle body side mounting portion 5 side. However, the present invention is not limited to this. For example, as shown in FIG. The case 71 and the motor housing 6 may be formed by a desired molding method and assembled in a subsequent process.

Further, the control unit accommodating portion 7 is not limited to the structure fixed to the vehicle body side attaching portion 5 via the case 71, but the vehicle body side attaching portion 5 via various portions of the control unit accommodating portion 7. It may be a structure fixed to. The structure as in the invention of claim 3, for example, a structure that is fixed to the vehicle body side mounting portion 5 via a flat portion of the control unit housing portion 7 (for example, the outer peripheral surface of the bottom wall 71 a or the outer peripheral surface of the peripheral wall 71 b). In other words, when the shape of the control unit housing portion 7 on the vehicle body side mounting portion 5 side is a flat shape, it is easy to secure a large area on the fixed surface, and it is possible to contribute to heat dissipation.

Also in the motor housing portion 6, as in the case of the control unit housing portion 7, the structure fixed to the vehicle body side mounting portion 5 is not particularly limited. The configuration as in the invention of claim 4, for example, the configuration in which the output shaft 2 c of the rotor 2 a of the motor 2 extends in a non-coaxial position with respect to the master cylinder S, in other words, the rotation of the motor In the case where the child 2a is arranged in the axial direction of the master cylinder S, the motor can be accommodated in the length direction of the master cylinder, which can contribute to downsizing of the apparatus.

The housing structure of the circuit board 8 with respect to the control unit housing portion 7 may be a structure that can be housed in the control unit housing portion 7 and is not particularly limited. When the configuration as in the fifth aspect of the invention, for example, the component mounting surface 80a (or 80b) is accommodated in a posture facing the master cylinder S, the component mounting surface (for example, the component mounting surface 80a or Since 80b) is configured to extend along the axial direction of the master cylinder, the brake control device can contribute to miniaturization in the radial direction of the master cylinder.

The motor housing portion 6 and the control unit housing portion 7 are not particularly limited as long as the motor housing portion 6 and the control unit housing portion 7 are provided in the vehicle body side mounting portion 5 so as to be separated from each other. In the configuration as in the invention of claim 6, for example, when the motor housing portion 6 and the control unit housing portion 7 are provided in a posture separated in the left and right wheel directions of the vehicle body, the ceiling direction side is opened. It becomes easy to form a gap and heat dissipation from the gap becomes good. Moreover, there exists an effect which blocks the external convection of the surroundings in a brake control apparatus, for example, the surrounding outside air in an engine room, As a result, it becomes possible to contribute to suppression of thermal interference.

Further, the control unit housing portion 7 having the case 71 and the cover 72 is not particularly limited as long as it has a structure capable of housing the circuit board 8. In the case of the configuration as in the seventh aspect of the invention, for example, the configuration in which the circuit board 8 is provided inside the cover 72, the cover is close to the circuit board. Will be. On the other hand, in the case of the configuration according to the invention of claim 8, for example, the configuration in which the circuit board 8 is provided inside the case 71, the case is close to the circuit board. Will be enhanced.

The electrical connection structure between the circuit board 8 (the energization terminal 84 and the like) and the motor 2 is not particularly limited. In the case of the configuration as in the ninth aspect of the invention, for example, in the configuration in which the communication port 79 communicating with the vehicle body side mounting portion 5 is formed on the vehicle body side mounting portion 5 side of the control unit housing portion 7, the communication port Thus, both the circuit board and the motor 2 can be electrically connected to each other, thereby contributing to wiring workability.

Claims

A master cylinder that generates brake fluid pressure by operating a brake pedal, and a motor that operates a piston in the master cylinder, and a plurality of control units each having a circuit board on which a drive element that drives and controls the motor is mounted. Accommodated in a housing unit having an accommodating portion,
The housing unit has a brake control device in which a motor housing portion for housing the motor and a control unit housing portion for housing the control unit are provided apart from each other in a vehicle body side mounting portion that is attached and fixed to the vehicle body. .
The brake control device according to claim 1, wherein a gap is formed between the motor housing and the control unit housing.
The brake control device according to claim 1, wherein the vehicle body side mounting portion side of the control unit housing portion is planar.
The brake control device according to claim 1, wherein the motor has a rotor and a stator, and the rotor extends in an axial direction of the master cylinder.
The brake control device according to claim 1, wherein the circuit board is housed in the control unit housing portion in a posture in which a component mounting surface extends along the axial direction of the master cylinder.
The brake control device according to claim 1, wherein the motor housing portion and the control unit housing portion are arranged in parallel in the left and right wheel direction of the vehicle body.
The control unit housing portion has a case having a housing opening for housing the circuit board, and a cover for closing the housing opening of the case, and the circuit board is fixed inside the cover. The brake control device according to claim 1.
The control unit housing portion has a case having a housing opening for housing the circuit board, and a cover for closing the housing opening of the case, and the circuit board is fixed inside the case. The brake control device according to claim 1.
The brake control device according to claim 1, wherein a communication port that communicates with the vehicle body side mounting portion is formed on a vehicle body side mounting portion side of the control unit housing portion.