JP2012240640A - Actuator for hydraulic pressure control of brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the electric connection between the terminal of a pressure sensor and wiring installed in a circuit board and its disconnection by a simple electric connection structure.SOLUTION: A connector 51 includes an insulating member 53 in which a recess 53a is formed, and a wiring part 52 which has a coil spring part 52a arranged in the recess 53a and through wiring 52c connected electrically with a pad part 5b in a circuit board 5 through the insulating member 53 from the bottom of the recess 53a. The connector is fixed to the circuit board 5. The terminal 7 is fixed to the body 3a of a pressure sensor 3 and is shaped like a bar member which projects straight from the body 3a. When a case 6 and a block 2 are assembled, the tip of the terminal 7 is inserted into the recess 53a of the insulating member 53, and it is electrically connected with the wiring part 52, and when the case 6 and the block 2 are disassembled, the tip of the terminal 7 separates from the recess 53a, whereby the connection between the terminal 7 and the wiring part 52 is cut off.

Description

  The present invention has a structure for electrically connecting a pressure sensor for detecting a brake fluid pressure and a circuit board, and electrically connecting and disconnecting a terminal provided in the pressure sensor and a control circuit provided in the circuit board. The present invention relates to a brake fluid pressure control actuator capable of performing the above.

  Conventionally, the electrical connection between the pressure sensor provided on the brake fluid pressure control actuator and the control circuit formed on the circuit board is achieved by directly soldering the terminal provided on the pressure sensor to the pad on the circuit board. It had been.

  However, in the brake fluid pressure control actuator, when an IC chip or the like included in the control circuit of the pressure sensor or the circuit board breaks down, it is necessary to replace the failed portion for repair. For this reason, the terminal provided in the pressure sensor and the pad on the circuit board are not firmly connected as in the case of soldering, and a structure in which the terminal can be easily detached from the electrical connection portion is desirable.

  Thus, as a structure in which the terminal of the pressure sensor can be easily detached from the pad of the circuit board, for example, there is one disclosed in Patent Document 1. The pressure sensor shown here has a structure in which a contact probe is constituted by an outer cylinder part, a rod and a coil spring, the rod is inserted into the outer cylinder part, and the rod can be pressed in one direction by the coil spring. With such a structure, when the contact probe is pressed against the pad of the circuit board, the rod is pressed to the pad side by the elastic force of the coil spring, and the contact between the rod and the pad is ensured. Electrical connection with the pad can be made.

JP 2009-42144 A

  However, when the contact probe is constituted by an outer cylinder part, a rod and a coil spring as in the electrical connection structure of the pressure sensor disclosed in Patent Document 1, a metal such as the outer cylinder part is processed into a thin cylindrical one. Difficult to do. In particular, when each element is miniaturized as the apparatus is miniaturized, it is difficult to form a complicated structure such as an outer cylinder, and it is not possible to cope with the miniaturization.

  Although it is conceivable that the contact probe is composed only of a rod and a coil spring without the outer tube portion, the rod is attached to one end of the coil spring. Shift. For this reason, since it is necessary to enlarge the area of the pad of the circuit board so as to allow the displacement of the tip position of the rod, it becomes impossible to cope with miniaturization after all.

  In view of the above, the present invention provides a brake fluid pressure control actuator capable of electrically connecting and disconnecting a terminal of a pressure sensor and wiring provided on a circuit board with a simple electrical connection structure. For the purpose.

  In order to achieve the above object, according to the first aspect of the present invention, the case (6) is assembled to the block (2), so that the pressure sensor (3) is connected to the connecting portion (5b) via the terminal (7). By being electrically connected, the brake fluid pressure control actuator is electrically connected to the pressure sensor (3) and the control circuit formed on the circuit board (5), and the pressure sensor (3) The circuit board (5) has a body (3a) made of an insulating material, the terminal (7) is fixed to the body (3a), and the body (3a) to the case (6) block (2) It is composed of a conductive material in the form of a rod extending in the direction of assembly to the case and the direction of separation of the case (6) from the block (2), and is fixed to one surface of the circuit board (5) on the side of the pressure sensor (3). Depending on the shape of the An insulating member (53) that forms a recess (53a) that is recessed in the extending direction of the lu (7), and a conductive material that is disposed in the recess (53a) and can be expanded and contracted in the recess (53a). The elastic conductor portions (52a, 52d) and the through wiring (52b) that penetrates the insulating member (53) and electrically connects the connection portion (5b) and the elastic conductor portions (52a, 52d) in the circuit board (5). When the case (6) is assembled to the block (2), the tip of the terminal (7) is pressed toward the pressure sensor (3) by the elastic conductor portions (52a, 52d) in the recess (53a). When the case (6) is separated from the block (2), the tip of the terminal (7) is separated from the recess (53a) when the case (6) is separated from the block (2). Connection with wiring part (52) It is characterized by being detached.

  With such a structure, the terminal (7) of the pressure sensor (3) and the circuit board (5) can be provided even if the terminal (7) of the pressure sensor (3) has a simple electrical connection structure without an outer cylinder portion. Electrical connection to the control circuit and disconnection of the connection can be performed. As a result, even if each element is miniaturized as the apparatus is miniaturized, it is not necessary to form a complicated structure such as an outer cylinder, and therefore it is possible to cope with miniaturization.

  In addition, since the terminal (7) of the pressure sensor (3) is not structured to be supported by a coil spring, the terminal (7) basically extends in a straight line. For this reason, there is little shift | offset | difference of the front-end | tip position of a terminal (7), and it can be ensured that the front-end | tip of a terminal (7) is inserted in the recessed part (53a) of the components for a connection (5). Therefore, it is not necessary to increase the area of the part where the electrical connection of the connecting component (51) is performed more than necessary, and it is possible to cope with miniaturization.

  For example, as described in claim 2, the elastic conductor portion (52a, 52d) is connected to an end portion on the pressure sensor (3) side, and the elastic conductor portion (52a, 52d) is expanded and contracted so as to be within the recess (53a). When the case (6) and the block (2) are assembled, the terminal (7) and the elastic conductor portions (52a, 52d) are electrically connected via the electrode pad (52b). It is set as the structure by which a general connection is performed.

  Thus, by providing the electrode pad (52b), the tip of the terminal (7) can be brought into contact with a large area, and the electrical connection between the terminal (7) and the wiring part (52) can be further secured. It becomes.

  According to a third aspect of the present invention, the elastic conductor portion is constituted by the coil spring portion (52a), the terminal (7) has a tapered tip, and the case (6) and the block (2) are assembled. Sometimes, the terminal (7) and the coil spring part (52a) may be electrically connected by inserting the tip of the terminal (7) into the coil spring part (52a). . Even if it is set as such a structure, the electrical connection of the terminal 7 and the wiring part 52 is securable.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

It is a partial cross section schematic diagram of actuator 1 for brake fluid pressure control concerning a 1st embodiment of the present invention. (A) is the figure which expanded the vicinity of the terminal 7 in FIG. 1, (b) is a top view of the pressure sensor 3. FIG. FIG. 2 is a partial cross-sectional schematic diagram illustrating a state before assembly of the brake fluid pressure control actuator 1 illustrated in FIG. 1. It is the figure which expanded the vicinity of the terminal 7 of the pressure sensor 3 among the actuators 1 for brake fluid pressure control concerning 2nd Embodiment of this invention. It is the figure which expanded the vicinity of the terminal 7 of the pressure sensor 3 among the actuators 1 for brake fluid pressure control concerning 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A brake fluid pressure control actuator to which the first embodiment of the present invention is applied will be described. FIG. 1 is a partial cross-sectional schematic view of a brake fluid pressure control actuator 1 according to the present embodiment.

  As shown in this figure, the brake fluid pressure control actuator 1 includes a metal block 2 having a pipe (not shown) for performing brake fluid pressure control, and the metal block 2. Pressure sensor 3 and electromagnetic valve and pump (not shown) fitted in the pump, a motor 4 for driving the pump provided on the opposite side of the block 2 to the electromagnetic valve and pressure sensor 3, and the pressure sensor 3, the electromagnetic valve and motor 4 The circuit board 5 in which the control circuit for driving is incorporated, and the case 6 for housing the circuit board 5 are provided.

  The block 2 is configured by a rectangular parallelepiped, for example, and the pressure sensor 3 and the electromagnetic valve are arranged and fixed on one surface thereof. Specifically, the metal block 2 is formed with a plurality of recesses 2a connected to piping for performing brake fluid pressure control, and a part of the pressure sensor 3 and the solenoid valve is formed in the recess 2a. Is inserted and fixed. If the pressure sensor 3 or the solenoid valve is detached from the block 2, the brake fluid leaks from the piping formed in the block 2, so that the sealing performance around the pressure sensor 3 or the solenoid valve is maintained. For example, it is fixed to the block 2 by crimping.

  Further, a terminal (lead pin) 7 for drawing out an electrical connection with a control circuit formed on the circuit board 5 is drawn out from a tip position of a portion of the pressure sensor 3 or the electromagnetic valve protruding from the block 2. Yes.

  The case 6 is provided with a space for accommodating the circuit board 5 and a space for accommodating the pressure sensor 3 and the electromagnetic valve. And the fixing | fixed part is provided in the desired location of the circuit board 5 and the case 6, and the circuit board 5 is being fixed to the case 6 by fastening with a screw or a fastening with a hook in this fixing | fixed part.

  Thus, the connection component 51 is provided on the pressure sensor 3 side of the circuit board 5 fixed to the case 6, and the terminal 7 of the pressure sensor 3 is connected to the wiring of the circuit board 5 via the connection component 51. It is electrically connected to the desired position.

  The details of the electrical connection structure between the terminal 7 of the pressure sensor 3 and the connection component 51 and the wiring of the circuit board 5 will be described with reference to FIG. 2A is an enlarged view of the vicinity of the terminal 7 in FIG. 1, and FIG. 2B is a top view of the pressure sensor 3.

  As shown in FIG. 2A, in this embodiment, the terminal 7 of the pressure sensor 3 is integrally formed with the body 3a of the pressure sensor 3 made of an insulating material such as resin. The terminal 7 is composed of a rod-like member that protrudes linearly from the body 3a in a direction perpendicular to the surface on which the pressure sensor 3 of the body 3a is fixed, and has a flat tip and a circular cross-sectional shape. , Square or other polygons.

  In this embodiment, four terminals 7 are provided as shown in FIG. 2B, and each terminal 7 is electrically connected to a desired portion of the pressure sensor 3. Specifically, the internal structure of the pressure sensor 3 is omitted because it is the same as the conventional structure. For example, a gauge resistor that constitutes a Wheatstone bridge is provided on a diaphragm in which a semiconductor chip is partially thinned. A terminal 7 is connected to each of the power terminal of the Wheatstone bridge, two intermediate terminals, and four of the GND terminals. When a voltage is applied to the power supply terminal of the pressure sensor 3, the resistance value of the gauge resistance is changed by applying the brake fluid pressure to the diaphragm, and the output potentials of the two intermediate terminals are changed. The brake fluid pressure can be detected based on the output potentials of the two intermediate terminals. Here, a case where four terminals 7 of the pressure sensor 3 are provided is taken as an example, but this is merely an example, and the number of terminals 7 is another number, for example, three. It may be.

  On the other hand, the circuit board 5 incorporates a control circuit for driving the pressure sensor 3, the electromagnetic valve, and the motor 4, and a wiring pattern constituting the control circuit is formed. A through hole 5a is formed at a desired location of the wiring pattern, and a part of the wiring part 52 of the connecting component 51 is inserted into the through hole 5a, and a pad part as a connecting part provided in the through hole 5a. It is electrically connected to 5b by soldering.

  The connection component 51 is configured by arranging the wiring portion 52 in a cylindrical recess 53 a formed in the insulating member 53. The wiring portion 52 includes a coil spring portion 52a housed in the recess 53a of the insulating member 53, a linear wire 52b provided on one end side of the coil spring portion 52a, and the other end of the coil spring portion 52a, that is, the recess 53a. And an electrode pad 52c disposed on the inlet side. The coil spring portion 52a, the linear wiring 52b, and the electrode pad 52c are all made of a conductor.

  The outer shape of the coil spring portion 52a is smaller than that of the recess 53a, and the coil spring portion 52a can be expanded and contracted by elastic force in the recess 53a. In the present embodiment, the coil spring portion 52a constitutes an elastic conductor portion.

  The straight wiring 52b is configured by extending one end of the coil spring portion 52a in a straight line or joining the one end of the coil spring portion 52a by welding or the like. The straight wiring 52b corresponds to a through wiring, and penetrates the bottom of the recess 53a of the insulating member 53 and protrudes toward the circuit board 5, and a portion of the linear wiring 52b protruding from the insulating member 53. Is inserted into the through hole 5 a of the circuit board 5, and electrical connection with a desired place of the wiring pattern formed on the circuit board 5 is made.

  The electrode pad 52c is formed of a plate-like member, joined to the other end of the coil spring portion 52a by welding or the like, and slides in the recess 53a as the coil spring portion 52a expands and contracts. In the present embodiment, the electrode pad 52c is formed in a circular shape, and at least the outer peripheral portion has a predetermined thickness so that the electrode pad 52c can slide in the recess 53a without tilting. Thereby, the electrode pad 52c is made to function as a guide. Further, a recess into which the coil spring portion 52a is fitted is formed on the coil spring portion 52a side of the electrode pad 52c, and the coil spring portion 52a and the electrode pad 52c are welded in this recess. The electrode pad 52c is preferably configured in the same shape as the recess 53a. However, the electrode pad 52c may have a shape different from that of the recess 53a as long as it can slide in the recess 53a.

  The insulating member 53 is made of an insulating material such as resin, and has a structure in which a recess 53 a is formed at a position corresponding to each terminal 7 of the pressure sensor 3. The coil spring portion 52a and the electrode pad 52c described above are disposed in each recess 53a, and the linear wiring 52b is inserted through the bottom of the recess 53a. The insulating member 53 is formed by, for example, resin molding. The joining member 51 can be configured by integrally molding the insulating member 53 and the wiring portion 52, or the linear wiring 52b of the wiring portion 52 is inserted into the bottom of the concave portion 53a of the molded insulating member 53. Thus, the joining component 51 can be configured.

  The brake fluid pressure control actuator shown in FIG. 1 is obtained by electrically connecting the terminal 7 of the pressure sensor 3 to a desired place in the wiring pattern of the circuit wiring 5 through the connecting component 51 configured as described above. 1 is configured.

  The brake hydraulic pressure control actuator 1 configured as described above is assembled as follows.

  FIG. 3 shows a state before assembly of the brake fluid pressure control actuator 1 shown in FIG. As shown in this figure, there are prepared a unit in which the pressure sensor 3 and a motor are fixed to the block 2 and a unit in which the circuit board 5 is fixed to the case 6.

  Subsequently, by moving at least one of these as indicated by the arrow in FIG. 3, the unitized case 6 and the block 2 are assembled and integrated. At this time, the tip of the terminal 7 comes into contact with the electrode pad 52c and pushes the electrode pad 52c into the back of the recess 53a against the elastic force of the coil spring portion 52a. Then, each unit is fixed by screwing or the like. As a result, the tip of the terminal 7 is in contact with the electrode pad 52c, and the tip of the terminal 7 and the electrode pad 52c are pressed with the tip of the terminal 7 pressing the electrode pad 52c based on the elastic force of the coil spring portion 52a. Contact is ensured. As a result, the brake fluid pressure control actuator 1 is completed.

  In this way, the two units can be integrated, and the electrical connection between the terminal 7 and the wiring part 52 of the connecting component 51 is performed, and the control circuit provided on the pressure sensor 3 and the circuit board 5 is connected. Electrical connection with a desired portion of the wiring pattern is made. With such a connection structure, even when the IC chip of the control circuit provided on the circuit board 5 is replaced due to a failure of the control circuit or the like, the terminal 7 remains in the electrode even if it is disassembled into two units again. Since it is only brought into contact with the pad 52c and is not joined by soldering or the like, the connection between the terminal 7 and the wiring portion 52 is easily disconnected when the terminal 7 is separated from the recess 53a.

  In the brake fluid pressure control actuator 1 described above, even if the terminal 7 of the pressure sensor 3 has a simple electrical connection structure without an outer cylinder portion, the terminal 7 of the pressure sensor 3 and the control circuit provided on the circuit board 5 are connected. Electrical connection and disconnection can be performed. As a result, even if each element is miniaturized as the apparatus is miniaturized, it is not necessary to form a complicated structure such as an outer cylinder, and therefore it is possible to cope with miniaturization.

  Further, since the terminal 7 of the pressure sensor 3 is not structured to be supported by a coil spring, the terminal 7 is basically in a state of extending linearly. For this reason, there is little shift of the tip position of the terminal 7, and the tip of the terminal 7 can be surely inserted into the recess 53a. Therefore, it is not necessary to increase the area of the part (electrode pad 52c) where the electrical connection is performed in the connection component 51 more than necessary, and it is possible to cope with miniaturization.

  In the present embodiment, the wiring part 52 is provided with the electrode pad 52b. However, by providing the electrode pad 52b, the tip of the terminal 7 can be brought into contact with a large area. It is possible to ensure electrical connection.

(Second Embodiment)
A second embodiment of the present invention will be described. In this embodiment, the configuration of the connection component 51 is changed with respect to the first embodiment, and the other parts are the same as those in the first embodiment. Therefore, only the parts different from the first embodiment will be described.

  FIG. 4 is an enlarged view of the vicinity of the terminal 7 of the pressure sensor 3 in the brake fluid pressure control actuator 1 according to the present embodiment. The basic overall configuration of the brake fluid pressure control actuator 1 is the same as that in FIG. 1 described in the first embodiment.

  In the first embodiment, the coil spring portion 52a is used as the elastic conductor portion. However, in the present embodiment, conductive rubber 52d is used as the elastic conductor portion as shown in FIG. The conductive rubber 52d is composed of a rubber member 52d in which a conductor is kneaded, and can be energized at least in a direction in which it is expanded and contracted by the tip of the terminal 7 of the pressure sensor 3. The wiring portion 52 is configured by joining the linear wiring 52b to one end of the conductive rubber 52d and joining the electrode pad 52c to the other end.

  Thus, in this embodiment, the conductive rubber 52d is used as the elastic conductor portion. Even if it is set as such a structure, the effect similar to 1st Embodiment can be acquired.

(Third embodiment)
A third embodiment of the present invention will be described. This embodiment is obtained by changing the configuration of the connection part 51 and the terminal 7 of the pressure sensor 3 with respect to the first embodiment, and the other aspects are the same as those of the first embodiment. Only the different parts will be described.

  FIG. 5 is an enlarged view of the vicinity of the terminal 7 of the pressure sensor 3 in the brake fluid pressure control actuator 1 according to the present embodiment. The basic overall configuration of the brake fluid pressure control actuator 1 is the same as that in FIG. 1 described in the first embodiment.

  Also in this embodiment, the wiring portion 52 is provided with a coil spring portion 52a and a straight wiring 52b. However, as shown in FIG. 5, the electrode pad 52c used in the first embodiment is not provided. By inserting the tip of the terminal 7 of the pressure sensor 3 into the portion 52a, the coil spring portion 52a and the terminal 7 of the pressure sensor 3 can be electrically connected. The tip of the terminal 7 may have any shape as long as it is brought into contact with the coil spring portion 52a. However, in this embodiment, the tip of the terminal 7 is partially inserted into the coil spring portion 52a and the inner periphery of the coil spring portion 52a. It has a tapered shape so that it can come into contact with a wide area.

  Thus, in this embodiment, it is set as the structure by which the terminal 7 of the pressure sensor 3 is made to contact directly with the coil spring part 52a. Even if it is set as such a structure, the electrical connection of the terminal 7 and the wiring part 52 can be ensured, and the effect similar to 1st Embodiment can be acquired.

(Other embodiments)
In each of the embodiments described above, an example of the structure of each part constituting the brake fluid pressure control actuator 1 has been shown, but the design can be changed as appropriate. For example, the shape of the block 2 and the case 6 and the fixing structure thereof may be changed as appropriate.

  Moreover, in the said embodiment, although it was set as the structure which inserts the linear wiring 52b of the wiring parts 52 in the through hole 5a of the circuit board 5, it does not need to be such a structure. That is, the connection structure may be such that the through wiring is surface-mounted on the circuit board 5 via solder bumps or the like.

  Moreover, in the said embodiment, although the linear wiring 53b was set as the structure penetrated the bottom part of the recessed part 53a of the insulating member 53, you may penetrate the side wall of the recessed part 53a. In this case, it is conceivable that a surface mounting pin or tab is connected to the linear wiring 53b penetrating the side wall of the recess 53a of the insulating member 53.

  DESCRIPTION OF SYMBOLS 1 ... Brake fluid pressure control actuator, 2 ... Block, 3 ... Pressure sensor, 3a ... Body, 4 ... Motor, 5 ... Circuit board, 5a ... Through hole, 5b ... Pad part, 6 ... Case, 7 ... Terminal, 51 ... Connection parts, 52 ... Wiring part, 52a ... Coil spring part, 52b ... Linear wiring, 52c ... Electrode pad, 52d ... Conductive rubber, 53 ... Insulating member, 53a ... Recessed part

Claims (3)

A block (2) in which a brake pipe is formed;
A pressure sensor (3) provided on one side of the block (2) and having a terminal (7);
A circuit board (5) on which a control circuit for driving the pressure sensor (3) and a connection part (5b) electrically connected to the control circuit are formed;
A case (6) for housing the circuit board (5);
When the case (6) is assembled to the block (2), the pressure sensor (3) is electrically connected to the connection part (5b) via the terminal (7), so that the pressure A brake fluid pressure control actuator in which a sensor (3) and the control circuit are electrically connected;
The pressure sensor (3) has a body (3a) made of an insulating material on the circuit board (5) side,
The terminal (7) is fixed to the body (3a), and the assembly direction from the body (3a) to the block (2) of the case (6) and from the block (2) of the case (6) Composed of a conductive material in the form of a rod extending in the separation direction of
An insulating member that is fixed to one surface of the circuit board (5) on the pressure sensor (3) side and that forms a recess (53a) that is recessed in the extending direction of the terminal (7) according to the shape of the terminal (7). (53)
An elastic conductor portion (52a, 52d) which is disposed in the recess (53a) and is made of a conductive material so as to expand and contract in the recess (53a);
A through-wiring (52b) that penetrates the insulating member (53) and electrically connects the connecting portion (5b) and the elastic conductor portion (52a, 52d) in the circuit board (5),
When the case (6) is assembled to the block (2), the tip of the terminal (7) is pressed toward the pressure sensor (3) by the elastic conductors (52a, 52d) in the recess (53a). When the case (6) is separated from the block (2), the tip of the terminal (7) is separated from the recess (53a). Brake hydraulic pressure control actuator characterized in that connection between said terminal (7) and said wiring part (52) is disconnected.   An electrode pad connected to the end of the elastic conductor (52a, 52d) on the pressure sensor (3) side and sliding in the recess (53a) as the elastic conductor (52a, 52d) expands and contracts. 52b) and when the case (6) and the block (2) are assembled, the terminal (7) and the elastic conductor portions (52a, 52d) are electrically connected via the electrode pad (52b). The brake fluid pressure control actuator according to claim 1, wherein: The elastic conductor portion is a coil spring portion (52a),
The terminal (7) has a tapered tip.
When the case (6) and the block (2) are assembled, the tip of the terminal (7) is inserted into the coil spring portion (52a), so that the terminal (7) and the coil spring are inserted. 2. The brake fluid pressure control actuator according to claim 1, wherein the actuator is electrically connected to the portion (52a).

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