JP2005319868A - Fluid control device and method for assembling same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the dispersion of the position in the axial direction of a coil by pressing a coil part 12 with a spring 5 toward the reference surface C of a housing 2 from a case 4. <P>SOLUTION: In a fluid control device comprising a housing 2 with a fluid passage formed therein, a solenoid valve 1 to open/close the fluid passage, a case 4 to hold the solenoid valve 1 between the housing 2 and itself, and a computer board 3 coupled with the case 4 to control the energization to the solenoid valve 1, the solenoid valve 1 has a coil part 12 in which a coil 13 having a coil terminal 18 joined with the computer board 3 is stored in a yoke 14, and a valve part 11 which is provided in the housing 2 and operated according to presence/absence of the energization to the coil 13 to open/close the fluid passage, and an elastic member 5 to press the coil part 12 against the housing 2 side is provided between the case 4 and the coil part 12. The valve part 11 and the coil part 12 are positioned in the axial direction with the reference place C of the housing 2 as the common reference plane. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fluid control device that opens and closes a fluid passage by a solenoid valve, and is applied to an ABS actuator of an ABS (anti-lock brake system) that avoids a tendency to lock a wheel by increasing or decreasing a brake fluid pressure in a vehicle, for example. Is preferred.

  As shown in FIG. 7, the conventional fluid control apparatus inserts and fixes the yoke 14 of the electromagnetic valve 1 in the housing 2 in which the fluid passage is formed, and then the coil terminal 18 protruding from the electromagnetic valve 1 is connected to the computer board. The computer board 3 and the coil terminal 18 are soldered to each other by being inserted into the hole of the case 4 to which 3 is fixed and the hole 31 of the computer board 3. In addition, the computer board 3 is fixed to the case 4 with bolts, and holes for passing the coil terminals 18 are formed in the case 4 and the computer board 3.

  The electromagnetic valve 1 includes a coil portion 12 that houses a coil 13 in a yoke 14 and a valve portion 11 that opens and closes a fluid passage, and the valve portion 11 is fixed to the housing 2. The coil portion 12 is further fixed around the yoke 14 by caulking the housing 2, that is, by fixing the thickness of the housing 2 to the yoke 14.

  However, this fluid control device has a problem that the computer cannot be replaced when it is desired to replace it due to an abnormality in the computer, and even the computer and solenoid valve 1 cannot be removed from the housing 2.

  Therefore, a fluid control device has been proposed in which the housing and the coil portion are fixed in a separate manner so that the computer and the coil portion can be exchanged (see, for example, Patent Document 1).

  As shown in FIG. 8, the fluid control device described in Patent Document 1 includes a coil 13 in which a coil wire 17 is wound around a bobbin 16, and a support portion 169 protrudes from the bobbin 16 toward the case 4. The support portion 169 is in contact with the support surface 49 of the case 4. Further, a disk 15 and a leaf spring 99 are provided between the housing 2 and the coil 13, and the leaf spring 99 presses the coil 13 in the axial direction, whereby the coil 13 against the armature 98 of the valve portion 11 is provided. Positioning in the axial direction is performed, and the coil portion 12 is held in the housing 2 by a leaf spring 99 via a disc 15 pushed into the yoke 14.

According to this, the coil part 12 and the case 4 that houses the computer 97 can be easily detached from the housing 2.
German Patent Application Publication No. 19503819

  However, as in the fluid control device described in Patent Document 1, when a method of fixing the coil portion 12 that presses the coil 13 by arranging the leaf spring 99 between the coil 13 and the disk 15 is adopted, The position in the axial direction varies depending on individual dimensional differences of each part and variation in the pressing force of the leaf spring 99, and the performance of the solenoid valve, particularly the performance of the magnetic characteristics varies, which is not preferable.

  In view of the above points, an object of the present invention is to reduce variations in the axial position of a coil.

  In order to achieve the above object, according to the first aspect of the present invention, a solenoid valve is provided between the housing (2) in which the fluid passage is formed, the solenoid valve (1) for opening and closing the fluid passage, and the housing (2). In a fluid control device comprising a case (4) for sandwiching (1) and a computer board (3) coupled to the case (4) and controlling energization to the electromagnetic valve (1), the electromagnetic valve (1 ) Includes a coil portion (12) in which a coil (13) having a coil terminal (18) joined to a computer board (3) is housed in a yoke (14), and a coil ( 13) is provided with a valve portion (11) that opens and closes the fluid passage by operating according to the presence or absence of energization to the coil portion (12) between the case (4) and the coil portion (12). 2) An elastic member that presses toward the side ( ), Characterized in that the provided.

  According to this, since the yoke is pressed against the housing by the elastic member, the axial position is fixed, and variations in the axial position of the coil can be reduced.

  The invention according to claim 2 is characterized in that the elastic member (5) is disposed between the case (4) and the yoke (14).

  In this way, in particular, if the yoke of the coil portion is pressed, the space in which the protrusion that insulates the coil terminal extends in the axial direction can be effectively used as the space for arranging the elastic member.

  In the third aspect of the invention, the brake fluid pressure from the master cylinder is transmitted to the wheel cylinder and used in a vehicle brake device that generates a braking force on the wheel. The brake fluid pressure is adjusted by the valve (1).

  Thus, the fluid control device of the present invention is suitable for use in a vehicle brake device.

  The invention according to claim 4 is characterized in that the elastic member (5) is a spring. According to this, it can be realized with a simple configuration.

  In the invention according to claim 5, the electromagnetic valve (1) is sandwiched between the housing (2) in which the fluid passage is formed, the electromagnetic valve (1) for opening and closing the fluid passage, and the housing (2). (4) and a computer board (3) that is coupled to the case (4) and controls energization of the solenoid valve (1), and the solenoid valve (1) is joined to the computer board (3). The coil (13) having the coil terminal (18) is fixed to the coil (12) housed in the yoke (14) and the housing (2), and depending on whether the coil (13) is energized. An assembly method of a fluid control device comprising a valve portion (11) that operates to open and close a fluid passage, wherein the valve portion (11) is fixed to the housing (2), and then the coil portion is attached to the housing (2). Assemble (12) to the housing (2) One end side of the part (12) is brought into contact, then the spring (5) is arranged on the other end side of the coil part (12), and then the spring (5) is placed between the coil part (12). The case (4) is arranged so as to be sandwiched, and the case (4) is fixed to the housing (2).

  According to this, the assembly of the fluid control device can be facilitated because it is a one-way assembly that is sequentially stacked.

  The invention according to claim 6 is characterized in that a guide projection (162) for positioning the spring (5) is provided on the other end side of the coil portion (12).

  According to this, since the spring is not easily displaced, the assembly of the fluid control device can be further facilitated.

  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.

  An embodiment of the present invention will be described. 1 is a cross-sectional view showing a main part of a fluid control device according to an embodiment, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 3 is an enlarged cross-sectional view of a portion B in FIG. FIG. 6 is a cross-sectional view for explaining an assembly method of the fluid control device.

  The fluid control device according to the present embodiment is used in a vehicle brake device that transmits a brake fluid pressure from a master cylinder to a wheel cylinder and generates a braking force on the wheel, and more specifically, a brake fluid by an electromagnetic valve. It is used as an ABS actuator for ABS that adjusts the pressure to avoid the tendency of wheel locking.

  As shown in FIG. 1, the fluid control device includes a solenoid valve 1, a housing 2 in which a fluid passage (not shown) through which brake fluid flows is formed, and a case 4 to which a computer board 3 is coupled. A plurality of solenoid valves 1 are sandwiched between them. A spring 5 that presses the coil portion toward the housing 2 is disposed between the case 4 and a coil portion (details will be described later) of the solenoid valve 1. The spring 5 is a cylindrical coil spring and corresponds to the elastic member of the present invention.

  The housing 2 is made of aluminum, and has a reservoir (not shown) that receives brake fluid from the wheel cylinder when reducing the brake fluid pressure, and sucks brake fluid from the reservoir and discharges it into the fluid passage. A pump (not shown) and the like are housed.

  The computer board 3 controls a drive circuit (not shown) of a motor (not shown) for driving the pump, a drive circuit (not shown) of the solenoid valve 1, and controls the drive circuit to the motor and the solenoid valve 1. A computer (not shown) for controlling the energization of the.

  The case 4 is made of a resin such as PBT, and the computer board 3 is fixed with bolts (not shown). And the coil terminal (detailed later) of the electromagnetic valve 1 passes through the hole (not shown) of the case 4 and is inserted into the hole 31 of the computer board 3, and the coil terminal of the electromagnetic valve 1 and the computer board 3 are soldered. It is attached. The case 4 has a recess 41 for positioning the spring 5.

  The electromagnetic valve 1 includes a valve portion 11 that opens and closes a fluid passage in the housing 2 and a coil portion 12 that drives a valve body of the valve portion 11 mainly using a coil and a yoke.

  The valve portion 11 is formed of a magnetic metal and a guide 111 formed in a stepped cylindrical shape, a stator core 112 formed of a magnetic metal in a bottomed cylindrical shape, a magnetic metal and a guide. Plunger 113 slidably held by 111, a valve body (not shown) that moves integrally with plunger 113 to open and close a fluid passage in housing 2, and is installed in stator core 112 to urge plunger 113 It consists of a spring 114 and the like. The guide 111 and the stator core 112 are welded with an intermediate member 115 made of a non-magnetic metal interposed.

  Before the valve part 11 is assembled to the housing 2, its constituent parts, such as a guide 111, a stator core 112, a plunger 113, and a spring 114, are sub-assembled.

  The coil unit 12 includes a coil 13, a yoke 14, and a disc 15. Further, the coil 13 includes a resin bobbin 16, a coil wire 17 wound around the outer periphery of the bobbin 16, and a coil terminal 18 to which an end of the coil wire 17 is joined.

  The yoke 14 has a substantially cup shape, and after inserting the coil 13 into the yoke 14, a magnetic disk 15 is press-fitted into an opening of the yoke 14 on the housing 2 side. Thereby, before the coil part 12 is assembled | attached to the housing 2, the coil 13, the yoke 14, and the disc 15 which are the components are subassembled.

  A plurality of (for example, three) frustoconical protrusions 161 projecting toward the disc 15 are formed on the end surface of the bobbin 16 on the housing 2 side, and the disc 15 is press-fitted into the yoke 14. Then, the end surface of the bobbin 16 on the case 4 side is pressed against the bottom of the yoke 14 in a state where the protrusion 161 is crushed.

  As shown in FIGS. 1 to 3, a cylindrical guide protrusion 162 that protrudes toward the case 4 through the hole 141 formed in the yoke 14 is provided on the end surface of the bobbin 16 on the case 4 side in the circumferential direction. Are formed at regular intervals.

  The four guide protrusions 162 have a function of positioning the spring 5, and the inner peripheral surface of the guide protrusion 162 is shaped to have the same curvature as the outer diameter of the spring 5, so that the spring 5 slides smoothly. It enables operation. The four guide protrusions 162 have a function of preventing the bobbin 16 from rotating. Furthermore, two of the four guide protrusions 162 have a function of supporting the coil terminal 18 that is an electrically conductive path and ensuring insulation from the yoke 14.

  Next, an assembly procedure of the fluid control device will be described.

  First, as shown in FIG. 4, the sub-assembled valve portion 11 is fixed to the housing 2. Specifically, a part of the guide 111 is inserted into the hole 21 of the housing 2 until the valve portion press-fitting height H, which is a dimension from the reference plane C of the housing 2 to the end of the stator core 112, becomes a predetermined value. The guide 111 is fixed to the housing 2 by caulking the vicinity of the opening end of the hole 21.

Next, as shown in FIG. 5, the sub-assembled coil portion 12 is assembled to the housing 2. Specifically, the coil portion 12 is fitted on the outer peripheral side of the valve portion 11 so as to surround the guide 111 and the stator core 112 of the valve portion 11 until the one end side of the coil portion 12 contacts the reference surface C of the housing 2. ,
Next, as shown in FIG. 6, the spring 5 is positioned on the other end side of the coil portion 12 so that the spring 5 is positioned by the four guide protrusions 162.

  Next, as shown in FIG. 1, the computer board 3 and the case 4 that are sub-assembled so as to hold the spring 5 between the concave portion 41 of the case 4 and the yoke 14 of the coil portion 12 are mounted in the housing. Fix to 2 with bolts (not shown). Thus, the coil portion 12 is urged by the spring 5 from the case 4 side toward the housing side 2, and one end side of the coil portion 12 is pressed against the reference plane C of the housing 2. Next, the coil terminal 18 of the coil unit 12 and the computer board 3 are soldered.

  In the above-described embodiment, the yoke 14 is pressed by the spring 5 from the case 4 toward the housing 2, so that variations in the axial position of the coil 13 can be reduced. More specifically, since the valve portion 11 and the coil portion 12 are positioned in the axial direction with the reference surface C of the housing 2 as a common reference surface, the relative axis between the valve portion 11 and the coil 13 of the coil portion 12 is determined. Variation in the direction position can be reduced.

  Further, when the disc 15 is press-fitted into the yoke 14, the end surface on the case 4 side of the bobbin 16 is pressed against the bottom surface of the yoke 14, so that the axial position of the coil 13 is fixed. That is, unlike the fluid control device described in Patent Document 1, it is not affected by the variation in the pressing force of the leaf spring 99, so that the variation in the axial position of the coil 13 can be reduced.

  Further, since the yoke 14 of the coil portion 12 is pressed, the space in which the guide protrusion 162 that insulates the coil terminal 18 extends in the axial direction can be effectively used as a space in which the spring 5 is disposed.

  Furthermore, since the spring 5 is positioned by the guide protrusion 162, the spring 5 is unlikely to be displaced when the fluid control device is assembled. Therefore, the assembly of the fluid control device can be facilitated.

  Further, in the fluid control device described in Patent Document 1 (see FIG. 8), the case 4 must be provided with a protruding shape in order to form the support surface 49, and the strength of the protruding shape portion is weak, and the mold There is a problem that the structure becomes complicated. On the other hand, this embodiment has the features that it does not have a protrusion-shaped portion and the mold structure is simplified.

  Furthermore, the fluid control device described in Patent Document 1 is prone to plastic deformation (sagging) because the strength of the protrusions such as resin is small, and is insufficiently fixed in the vertical direction. Then, the lower end surface of the yoke 14 is in contact with the housing 2, and the fixing in the vertical direction is sufficient by the repulsive force of the spring 5.

  Furthermore, in the fluid control device described in Patent Document 1, the coil 13 is fixed in the axial direction by pressing the protrusion (support portion 169) integral with the bobbin 16 against the protrusion (support surface 49) integral with the case 4. However, the bobbin 16 is inclined when the protrusion is fixed at only one position.

  When the bobbin 16 is tilted, the coil terminal 18 assembled to the bobbin 16 is also tilted. If the coil terminal 18 assembled to the bobbin 16 and the terminal insert-molded in the case 4 are joined in this state, the joint surface is always stressed and may be peeled off by repeated vehicle vibrations. It is necessary to suppress the inclination of the bobbin 16 by adding a protrusion on the side.

  However, even if it does so, it cannot be said that this problem has been eliminated, and the problem remains that it remains unstable (wobbles) in directions other than the two points (in a direction perpendicular to the two points).

  In contrast, in this embodiment, the entire circumference of the yoke 14 is uniformly pressed by the compression spring (cylindrical coil spring) 5, so that the coil terminal 18 assembled to the bobbin 16 inside is also inclined. In addition, since a stable state is maintained even after joining, a high reliability guarantee can be obtained against concerns about separation due to repeated vehicle vibrations.

It is sectional drawing which shows the principal part of the fluid control apparatus which concerns on one Embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is an expanded sectional view of the B section of FIG. It is sectional drawing with which it uses for description of the assembly method of the fluid control apparatus of FIG. It is sectional drawing with which it uses for description of the assembly method of the fluid control apparatus of FIG. It is sectional drawing with which it uses for description of the assembly method of the fluid control apparatus of FIG. It is sectional drawing which shows the principal part of the conventional fluid control apparatus. It is sectional drawing which shows the principal part of another conventional fluid control apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Solenoid valve, 2 ... Housing, 3 ... Computer board, 4 ... Case, 5 ... Spring (elastic member), 11 ... Valve part, 12 ... Coil part, 13 ... Coil, 14 ... Yoke, 18 ... Coil terminal.

Claims (6)

A housing (2) in which a fluid passage is formed;
An electromagnetic valve (1) for opening and closing the fluid passage;
A case (4) for sandwiching the solenoid valve (1) between the housing (2);
In the fluid control device, which is coupled to the case (4) and includes a computer board (3) for controlling energization to the solenoid valve (1),
The electromagnetic valve (1) includes a coil portion (12) in which a coil (13) having a coil terminal (18) joined to the computer board (3) is accommodated in a yoke (14), and the housing (2). ) And a valve portion (11) that opens and closes the fluid passage by operating according to whether or not the coil (13) is energized,
An elastic member (5) for pressing the coil part (12) toward the housing (2) is provided between the case (4) and the coil part (12). apparatus. The fluid control device according to claim 1, wherein the elastic member (5) is disposed between the case (4) and the yoke (14). It is used in a vehicle brake device that transmits the brake fluid pressure from the master cylinder to the wheel cylinder and generates braking force on the wheels.
The fluid control device according to claim 1 or 2, wherein the brake fluid flows through the fluid passage, and the brake fluid pressure is adjusted by the electromagnetic valve (1). The fluid control device according to any one of claims 1 to 3, wherein the elastic member (5) is a spring. A housing (2) in which a fluid passage is formed;
An electromagnetic valve (1) for opening and closing the fluid passage;
A case (4) for sandwiching the solenoid valve (1) between the housing (2);
A computer board (3) coupled to the case (4) and controlling energization of the solenoid valve (1);
The electromagnetic valve (1) includes a coil portion (12) in which a coil (13) having a coil terminal (18) joined to the computer board (3) is accommodated in a yoke (14), and the housing (2). ) And a valve part (11) that opens and closes the fluid passage by actuating in accordance with whether or not the coil (13) is energized,
Fixing the valve part (11) to the housing (2);
Next, the coil part (12) is assembled to the housing (2), and one end side of the coil part (12) is brought into contact with the housing (2),
Next, a spring (5) is arranged on the other end side of the coil part (12),
Next, the case (4) is disposed so as to sandwich the spring (5) between the coil portion (12) and the case (4) is fixed to the housing (2). A method of assembling the fluid control device characterized by the above. The fluid control device assembly method according to claim 5, further comprising a guide protrusion (162) for positioning the spring (5) on the other end side of the coil portion (12).

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