JP2009241702A - Brake fluid pressure control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability in relation to thermal load of a brake fluid pressure control device combined with an electronic control unit and a fluid pressure unit by contriving an electric connection of a terminal with an electric circuit on a rigid circuit board stored in a case of the electronic control unit and effectively absorbing relative displacement of the terminal and the rigid circuit board due to a change of environmental temperature, while avoiding an increase of a height dimension of the device. <P>SOLUTION: The coil terminal 24 is inserted into the rigid circuit board 3 stored in the case of the electronic control unit. The coil terminal 24 is electrically connected to the electric circuit on the rigid circuit board 3 via a flexible circuit board 4. A clearance for allowing bending of a terminal joining part 13 of the flexible circuit board 4 is provided between the terminal 24 and an inner peripheral surface of a terminal insertion hole 12 formed in the rigid circuit board 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a brake hydraulic pressure control device configured by combining an electronic control unit having a rigid circuit board and a hydraulic pressure unit having an electromagnetic valve, and more specifically, a terminal connection structure for an electric circuit on the rigid circuit board is devised. The present invention relates to a brake fluid pressure control device that improves the reliability against heat load.

As a conventional example of the brake fluid pressure control apparatus mentioned above, for example, there are those disclosed in Patent Documents 1 and 2 below. The schematic structure of the apparatus described in Patent Document 1 is shown in FIG. Moreover, the schematic structure of the apparatus described in Patent Document 2 is shown in FIG.
In these drawings, 1 is an electronic control unit configured by housing the rigid circuit board 3 inside the case 2, and 20 is a hydraulic pressure in which a plurality of pressure control electromagnetic valves 22 are assembled on one surface of the housing 21. Is a unit. The hydraulic unit 20 is provided with a hydraulic passage (not shown) inside the housing 21, a solenoid valve 22 on one surface of the housing 21, and a pump driving motor (also not shown) on the other surface. It is assembled and configured. The case 2 is attached to one surface of the housing 21 of the hydraulic unit 20, and a coil (solenoid coil) 23 of the electromagnetic valve 22 assembled to the housing 21 is covered with the case 2.

  The case 2 of the illustrated apparatus is configured by combining a main body 2a and a cover 2b that are fusion-bonded to each other at a part 2c, and includes a substrate storage chamber I for storing a rigid circuit board 3 and a coil 23 for an electromagnetic valve. Has a coil storage chamber II. In the main body 2a of the case, a connector hood portion 5a constituting the connector portion 5 is integrally formed on one side of the peripheral wall surrounding the coil storage chamber II and is overhanged. A storage chamber spacing wall 2d is provided therebetween. The connector part 5 has a connector terminal 6, and the connector terminal 6 penetrates through the rigid circuit board 3 stored in the board storage chamber I and is soldered to a circuit conductor on the rigid circuit board 3.

  12 separates the substrate storage chamber I and the coil storage chamber II by the storage chamber interval wall 2d, the coil 23 is the housing 21 of the hydraulic unit 20, and the rigid circuit board 3 is the case 2. The coil terminals 24 held respectively by the plurality of board holding portions 2e and penetrated through the rigid circuit board 3 are soldered to the electric circuit on the rigid circuit board 3, and the joint portions (soldering) of the coil terminals 24 are used when the apparatus is used. In order to relieve the stress applied to the part), a clinching part 25 is provided in the middle of the coil terminal 24 in the longitudinal direction.

  In addition to the above elements, the case 2 is also provided with a sealant filling portion 2g. The sealing agent filling portion 2g is provided for the purpose of hermetically sealing the periphery of the coil terminal 24 inserted through the storage wall interval wall 2d by filling the sealing agent in the sealing agent filling portion 2g. The joint surface between the case 2 and the housing 21 is sealed with a packing 7.

In the brake fluid pressure control device of FIG. 12, the coil 23 is held in the housing 21 of the fluid pressure unit. On the other hand, in the brake fluid pressure control device of FIG. 13, the coil 23 is held in the case 2, and when the case mounting bolt (not shown) is removed, the case 2 and the rigid circuit board 3 housed in the case, The assembly on the electronic control unit side constituted by the coil 23 of the solenoid valve is separated from the housing 21 on the J plane. In a state where the electronic control unit 1 and the hydraulic unit 20 are combined, the coil 23 is pushed up by the coil holding spring 8 and positioned by the coil stopper 2f.
JP 2002-368552 A JP-A-2005-29110

  In the conventional brake fluid pressure control device, as shown in FIGS. 12 and 13, the relative displacement (particularly relative displacement in the longitudinal direction of the terminal) between the rigid circuit board 3 and the coil 23 due to thermal expansion and contraction of the case and terminals is provided. As a countermeasure, the above-described clinching portion 25 is provided on the coil terminal 24. 12 and 13 in which the rigid circuit board 3 and the coil 23 are held by separate members, the relative displacement between the coil terminal 24 and the rigid circuit board 3 caused by the thermal expansion / contraction difference is large, and the rigid circuit board 3 of the coil terminal 24 is large. The clinching portion 25 is indispensable for protecting the joint portion (soldering portion) 9 against the stress due to relative displacement. However, when the clinching portion 25 is provided, the height of the brake fluid pressure control device becomes large, and the mounting of the device is restricted for a vehicle that cannot secure a sufficient space in the engine room.

  Further, the connector hood portion 5a of the connector portion 5 may be warped due to a change in environmental temperature when the apparatus is used, and at that time, a relative displacement occurs between the connector terminal 6 and the rigid circuit board 3. Since the connector terminal 6 has no clinching portion, the relative displacement between the rigid circuit board 3 and the connector hood portion 5a is not absorbed, and as a result, an unreasonable force may act on the joint portion 9 of the connector terminal 6.

  The present invention effectively devisees the electrical connection of the terminal to the electric circuit on the rigid circuit board, thereby effectively preventing the relative displacement between the terminal and the rigid circuit board due to a change in environmental temperature while avoiding an increase in the height dimension of the device. The problem is to improve the reliability of the brake fluid pressure control device with respect to the heat load by making it possible to absorb.

  In order to solve the above problems, in the present invention, a brake hydraulic pressure control device configured by combining an electronic control unit in which a rigid circuit board is housed in a case and a hydraulic pressure unit having an electromagnetic valve for pressure control, The following features were given. Specifically, it has a terminal inserted through the rigid circuit board, and the terminal is electrically connected to an electric circuit on the rigid circuit board via a flexible circuit board (hereinafter abbreviated as FPC). Between the terminal and the inner peripheral surface of the terminal insertion hole formed in the rigid circuit board, a clearance allowing the deflection in the vicinity of the terminal joint portion of the FPC was provided.

  There are at least two types of terminals connected to the electric circuit on the rigid circuit board: a coil terminal extending from the coil of the electromagnetic valve toward the rigid circuit board and a connector terminal of the connector portion. Among these, the coil terminal is inserted into the terminal insertion hole provided in the rigid circuit board with the above-described gap, and is electrically connected to the electric circuit on the rigid circuit board via the FPC. Similarly, the connector terminal can be inserted into the rigid circuit board and electrically connected to the electric circuit on the rigid circuit board via the FPC, but this connector terminal can be connected to the FPC without being inserted into the rigid circuit board. It is also possible to connect to a rigid circuit board via

  As a preferred embodiment of the apparatus of the present invention, the case includes a substrate storage chamber for storing the rigid circuit board and the FPC, a coil storage chamber for storing the coil, and a partition wall disposed between the storage chambers. Furthermore, a stay extending in the same direction as the coil terminal is provided in the coil of the electromagnetic valve, the coil is inserted into a cylindrical guide provided in the partition, and the stay is connected to the rigid circuit board. A structure in which the rigid circuit board is fixed to the coil is conceivable.

  Further, a structure in which the electric circuit on the FPC is electrically connected to the electric circuit on the rigid circuit board at a location different from the terminal joint portion to the FPC, and the connection portion is integrated at one location is also preferable.

  In the present invention, since the terminal inserted through the rigid circuit board is connected to the electric circuit on the rigid circuit board via the FPC, the relative displacement between the terminal and the rigid circuit board is absorbed by the deflection of the FPC. Therefore, a large stress is not applied to the joint portion of the terminal, so that the terminal joint portion can be reliably protected and the reliability of the apparatus against the thermal load can be improved.

  Since the terminal joint can be protected without clinching the terminal, an increase in the height of the device can be avoided.

  The operation and effect of the preferred embodiment will be described in the next section.

  Embodiments of the present invention will be described below with reference to FIGS. 1 to 11 of the accompanying drawings. 1 to 5 show a first embodiment of a brake fluid pressure control device of the present invention. This brake fluid pressure control device has an electronic control unit 1 configured by housing a rigid circuit board 3 and an FPC (flexible circuit board) 4 in a case 2 made of resin, and an electromagnetic valve 22 for pressure control. The hydraulic unit 20 is combined.

  The hydraulic unit 20 is configured by assembling a plurality of pressure control electromagnetic valves 22 on one surface of a housing 21. Since the hydraulic unit 20 is not different from the conventional product described in FIG. 12, only the housing 21 and the electromagnetic valve 22 are illustrated, and detailed description thereof is omitted. The coil 23 of the electromagnetic valve 22 is fixed to the housing 21 by caulking.

  The case 2 of the electronic control unit 1 includes a main body 2a and a cover 2b that are fusion-bonded to each other at a portion 2c in FIG. The main body 2a of the case 2 includes a substrate storage chamber I for storing the rigid circuit board 3 and the FPC 4, a coil storage chamber II for storing the coil 23 of the solenoid valve, and a storage chamber spacing wall disposed between the storage chambers. 2d and a connector portion 5 that is integrated with one side of the peripheral wall surrounding the coil storage chamber II and formed in an overhanging state.

The connector part 5 has a connector hood part 5a and connector terminals 6 provided so as to penetrate through the partition walls of the connector hood part 5a.

  In the illustrated apparatus, stays 26 (see FIGS. 3 to 6) extending in the same direction as the coil terminals 24 are provided in the coils 23 at both ends in the arrangement direction, and the stays 26 (the illustrated apparatus includes a total of eight stays 26). The stay 26 is connected to the rigid circuit board 3 by press-fitting a small-diameter portion at the tip of a) into a small hole provided in the rigid circuit board 3. For this purpose, the rigid circuit board 3 is fixed to the coil 23. Supported by. A cylindrical guide portion 10 shown in FIGS. 3 and 4 is provided on the storage chamber interval wall 2d provided in the main body portion 2a of the case 2, and the coil 23 is inserted inside the cylindrical guide portion 10. . By adopting such a structure, the coil 23 can be brought closer to the rigid circuit board 3 and the height of the electronic control unit 1 can be further reduced. However, the present invention provides the board storage chamber I and the coil storage chamber II. The present invention can also be applied to the apparatus having the structure of FIGS. 12 and 13 separated from each other, and the cylindrical guide portion 10 is not an essential element.

  The coil terminal 24 is inserted into the rigid circuit board 3 and the FPC 4 and soldered to an electric circuit (not shown) provided in the FPC 4. 2 to 5 is a joint where the coil terminal 24 is soldered to the FPC 4. A terminal insertion hole 12 shown in FIG. 5 is provided in the rigid circuit board 3, and a coil terminal 24 is inserted into the terminal insertion hole 12. A gap g is provided between the inner peripheral surface of the terminal insertion hole 12 and the coil terminal 24. The gap g is set to a size that allows displacement of the coil terminal 24 and entry of a part of the FPC 4, thereby allowing bending in the vicinity of the coil terminal joint portion of the FPC 4. 24 and the rigid displacement of the rigid circuit board 3 are absorbed.

  The electric circuit of the FPC 4 is electrically connected to an electric circuit (not shown) on the rigid circuit board 3 in the vicinity of the joint 13 in FIG. The joining is performed by ultrasonic joining or adhesion. Further, the FPC 4 is provided with an extension portion 4a extending from the end of the rigid circuit board 3 toward the connector portion 5 side, and the connector terminal 6 is inserted into the extension portion 4a of the FPC 4 and is connected to the extension portion 4a. It is soldered to the provided electric circuit (11 in FIG. 2).

  The connector terminal 6 may be connected to the electric circuit on the rigid circuit board 3 via the FPC 4 without being inserted into the rigid circuit board 3 as shown in FIG. When extending, it can be connected to the electric circuit on the rigid circuit board 3 in the same manner as the coil terminal 24.

  In the brake hydraulic pressure control device according to the first embodiment described above, the coil 23 is fitted to the main body portion 22a (see FIG. 5) of the electromagnetic valve assembled to the housing 21 of the hydraulic pressure unit 20, and then the housing 21 is fitted. Secure by caulking. Next, the body 2 a of the case 2 is covered and fastened to the housing 21 with the case mounting bolt 16. Further, before and after that, a board set in which the rigid circuit board 3 and the FPC 4 are combined in advance is mounted on the stay 26, and the coil terminal 24 is soldered to the FPC 4 to form the joint portion 13. Further, the extension portion 4a of the FPC 4 is supported by a stay 2h provided in the case 2, and the connector terminal 6 is soldered to the extension portion 4a to form the joint portion 13. Thereafter, the cover 2b of the case is fused to the main body 2a at the portion 2c in FIG. 2 to complete the assembly.

  Reference numeral 14 in FIG. 4 denotes a motor terminal that connects the motor to an electric circuit of the board set. The motor terminal 14 and a GND terminal (not shown) are inserted into an inner terminal 15 provided on the case 2 when the main body 2a of the case 2 is put on the coil 23. In addition to the above elements, the case 2 is provided with the intake / exhaust port 17 shown in FIG. The intake / exhaust port 17 is provided for the purpose of preventing the inside of the case from becoming a negative pressure, and includes a filter that allows passage of air and prevents passage of moisture. The joint surface of the case 2 with the housing 21 is sealed by the packing 7.

  6 to 9 show the second embodiment, and FIGS. 10 and 11 show the third embodiment. In the brake hydraulic pressure control device of the second embodiment, the coil 23 of the electromagnetic valve 22 is assembled in advance in an assembly on the electronic control unit side. A plurality of substrate holding portions 2e are provided on the main body portion 2a of the case 2, the rigid circuit board 3 is supported by the substrate holding portions 2e, and stays 26 provided on the coils 23 at both ends in the arrangement direction are press-fitted into the rigid circuit substrate 3. The coil 23 is fixed to the rigid circuit board 3. In the case of this structure, the coil 23 is handled together with the assembly on the electronic control unit side. Therefore, in handling until the electronic control unit 1 is connected to the hydraulic unit 20, the coil 23 is prevented from shaking and the rigid circuit board 3. It is desirable to prevent damage to the coil connecting part. In order to meet this requirement, the cylindrical guide portion 10 shown in FIGS. 6 and 7 is provided in the storage chamber interval wall 2d provided in the main body portion 2a of the case 2, and the coil 23 is provided inside the cylindrical guide portion 10. The cylindrical guide portion 10 prevents the coil 23 from swinging, and the height of the electronic control unit 1 is shortened by adopting the structure shown in the figure.

  In the brake hydraulic pressure control device according to the third embodiment, the coil terminal 24 extending from the coil 23 of the electromagnetic valve 22 is connected to the electric circuit of the rigid circuit board 3 via the FPC 4, and the electric circuit of the FPC 4 at that time The connecting portions 18 for the electric circuit of the rigid circuit board 3 are gathered in one place, and the connecting portions 18 for electrical continuity are gathered in one place, so that the electric circuit between the FPC 4 and the rigid circuit board 3 can be connected to each other. As compared with the connection performed near the coil 23, the electronic component mounting restriction on the upper surface of the rigid circuit board 3 is relaxed. The FPC 4 is placed along the lower surface of the rigid circuit board 3, and this also helps to ease restrictions on mounting electronic components on the rigid circuit board 3.

The top view of the brake fluid pressure control device of a 1st embodiment Sectional drawing along the AA line of FIG. The top view of the position along the BB line of FIG. Sectional drawing along CC line of FIG. Sectional drawing of the part along the DD line of FIG. The top view of the state which removed the cover of the case of the brake fluid pressure control apparatus of 2nd Embodiment Sectional drawing along the EE line of FIG. Sectional drawing of the part along the FF line of FIG. The top view of the position equivalent to the AA line of FIG. 1 of the brake fluid pressure control apparatus of FIG. The top view of the position equivalent to the AA line of Drawing 1 of the brake fluid pressure control device of a 3rd embodiment. Sectional drawing of the part according to the DD line of FIG. 3 along the GG line of FIG. Sectional drawing which shows one form of conventional apparatus Sectional drawing which shows the other form of a conventional apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic control unit 2 Case 2a Main-body part 2b Cover 2c The part to be welded 2d Storage chamber space | interval wall 2e Board holding part 2f Coil stopper 2g Sealing agent filling part 2h Stay 3 Rigid circuit board 4 Flexible circuit board (FPC)
4a extension portion 5 connector portion 5a connector hood portion 6 connector terminal 7 packing 8 coil holding springs 9, 11, 13 joint portion 10 cylindrical guide portion 12 terminal insertion hole 14 motor terminal 15 inner terminal 16 case mounting bolt 17 intake / exhaust port 18 Connection unit 20 Hydraulic unit 21 Housing 22 Solenoid valve 22a Main unit 23 Coil 24 Coil terminal 25 Clinching unit 26 Stay

Claims (5)

  Brake hydraulic pressure control device comprising a combination of an electronic control unit (1) housing a rigid circuit board (3) in a case (2) and a hydraulic pressure unit (20) having an electromagnetic valve (22) for pressure control The terminal (24 or 6 and 24) is inserted into the rigid circuit board (3), and the terminal (24 or 6 and 24) is connected to the rigid circuit board via the flexible circuit board (4). (3) The flexible circuit board (4) electrically connected to the upper electric circuit and between the terminal and the inner peripheral surface of the terminal insertion hole (12) formed in the rigid circuit board (3). Brake hydraulic pressure control device provided with a gap (g) that allows bending in the vicinity of the terminal joint portion.   A coil terminal (24) extending from the coil (23) of the electromagnetic valve (22) to the rigid circuit board (3) side is inserted into the rigid circuit board (3), and the coil terminal (24) is inserted into the flexible circuit board. 2. The brake fluid pressure control device according to claim 1, wherein the brake fluid pressure control device is electrically connected to an electric circuit on the rigid circuit board (3) via a board (4).   A coil terminal (24) extending from the coil (23) of the electromagnetic valve (22) to the rigid circuit board (3) side, and a connector terminal (6) of a connector portion (5) provided in the case (2) The rigid circuit board (3) is inserted, and both the coil terminal (24) and the connector terminal (6) are connected to the electric circuit on the rigid circuit board (3) via the flexible circuit board (4). The brake fluid pressure control device according to claim 1, wherein the brake fluid pressure control device is electrically connected.   A substrate storage chamber (I) for storing the rigid circuit board (3) and the flexible circuit board (4) in the case (2), and a coil storage chamber (II) for storing the coil (23) of the solenoid valve. And a storage chamber spacing wall (2d) disposed between the storage chambers, and a stay (26) extending in the same direction as the coil terminal (24) to the coil (23) of the electromagnetic valve (22). The coil (23) is inserted into a cylindrical guide part (10) provided in the storage chamber spacing wall (2d), and the stay (26) is connected to the rigid circuit board (3) to connect the coil. The brake hydraulic pressure control device according to any one of claims 1 to 3, wherein the rigid circuit board (3) is fixed to (23).   The electrical circuit on the flexible circuit board (4) is electrically connected to the electrical circuit on the rigid circuit board (3) at a place different from the terminal joint (13), and the connection part (18) is The brake hydraulic pressure control device according to any one of claims 1 to 4, wherein the brake hydraulic pressure control device is provided in a concentrated manner.

Images