JP2005132347A - Braking fluid control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce part manufacturing cost and assembling man power, to obtain fine sealing performance, and to miniaturize a solenoid valve. <P>SOLUTION: A check valve 31 is held by a filter member 35, thereby eliminating a conventional holding member, and reducing the part manufacturing cost and assembling man power. A metal guide 32 is pressed into the assembly hole 71 of a metal housing 7, thereby obtaining fine sealing performance at the closely contacted part between them. Furthermore, a valve seat 34, the check valve 31, and the filter member 35 are arranged in the guide 32, thereby shortening the solenoid valve 3 in the axial direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a brake fluid control device that opens and closes a fluid passage by an electromagnetic 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. It is preferable.

  In the conventional ABS actuator, as shown in FIG. 5, first and second fluid passages 72, 73 through which brake fluid flows are formed in the housing 7, and the fluid passages 72, 73 are opened and closed by the electromagnetic valve 3. It is like that.

  The electromagnetic valve 3 includes a valve seat 34 in which first and second communication holes 341 and 342 for communicating between the fluid passages 72 and 73 are formed. The first valve corresponds to whether or not the coil is energized. The body 331 opens and closes the first communication hole 341, and the second valve body 31 opens and closes the second communication hole 342 in accordance with the pressure difference between the first and second fluid passages 72 and 73.

Then, the second valve body 31 is disposed in the valve seat 34, the holding member 100 that holds the second valve body 31 at a position facing the second communication hole 342 is mounted on the valve seat 34, and further, the filter member 200. Is integrated with the valve seat 34 to form a seat assembly. Further, the seat portion assembly is mounted on a cylindrical guide 32 inserted into the assembly hole 71 of the housing 7 (see, for example, Patent Document 1).
Special table 2003-503260 gazette

  However, in the above-described conventional ABS actuator, the seat part assembly is configured by four parts of the valve seat 34, the second valve body 31, the holding member 100, and the filter member 200. As a result, the parts production cost and assembly man-hours increase.

  Further, although the resin filter member 200 is in close contact with the metal housing 7, the difference in linear expansion coefficient between the two is large, so that there is a problem that good sealability between the close contact portions cannot be obtained. . Furthermore, since most of the seat portion assembly protrudes from the guide 32, there arises a problem that the physique of the electromagnetic valve 3 becomes large.

  In view of the above points, an object of the present invention is to reduce component manufacturing costs and assembly man-hours. Another object of the present invention is to obtain a good sealing property and to further reduce the size of the solenoid valve.

  In order to achieve the above object, according to the first aspect of the present invention, a metal housing (7) and a solenoid valve (3) are provided, and the housing has an assembly hole (71) into which a part of the solenoid valve is inserted. And first and second fluid passages (72, 73) that communicate with the assembly hole and through which the fluid flows, and the solenoid valve includes a cylindrical metal guide (32) having one end inserted into the assembly hole. The valve seat (34, 34a) formed with the coil (40) disposed on the outer periphery of the other end of the guide and the first and second communication holes (341, 342) for communicating between the first and second fluid passages. ), And a first valve body (331) that opens and closes the first communication hole in response to whether the coil is energized, and a second valve that opens and closes the second communication hole according to the pressure difference between the first and second fluid passages. Two valve bodies (31) and a filter member (35 for collecting foreign matter in the fluid) 35a), the outer peripheral surface on one end side of the guide is in close contact with the assembly hole of the housing, the valve seat, the second valve body, and the filter member are disposed in the guide, and the second valve body is further moved by the filter member. It is the structure hold | maintained in the position facing a 2nd communicating hole, It is characterized by the above-mentioned.

  According to this, since the second valve body is held by the filter member, the conventional holding member can be abolished, and the part manufacturing cost and assembly man-hour can be reduced. Further, since the metal housing and the metal guide are brought into close contact with each other, the difference between the linear expansion coefficients of the two is small, and a good sealing property can be obtained at the contact portion between the two. Furthermore, since the valve seat, the second valve body, and the filter member are arranged in the guide, the axial length of the solenoid valve is shortened, and the solenoid valve can be made compact.

  The invention according to claim 2 is characterized in that the valve seat (34, 34a), the second valve body (31), and the filter member (35, 35a) are integrated to form a seat assembly. And

  According to this, since the preliminary inspection of the flow characteristics of the first communication hole and the airtight performance when the second valve body is closed can be performed in the state of the seat portion assembly, the defective seat portion assembly is removed at this time. Can be eliminated. Therefore, in the inspection after being assembled as a solenoid valve, the probability of occurrence of a flow characteristic defect or a poor airtight performance is reduced, so that the cost can be reduced. In addition, it is possible to reduce the useless resources.

  Further, since the valve seat, the second valve body, and the filter member are integrated, it is easy to assemble them into the guide.

  The invention according to claim 3 is characterized in that the valve seat (34) has a bottomed cylindrical shape, and the second valve body (31) and the filter member (35) are arranged in the valve seat.

  According to this, since the dead space in the valve seat is effectively used as the installation location of the second valve body and the filter member, the electromagnetic valve can be reduced in size.

  The invention according to claim 4 is characterized in that the sheet portion assembly is press-fitted into the guide (32). According to this, the assembly | attachment to the guide of a sheet | seat part assembly is easy.

  The invention according to claim 5 is characterized in that all parts of the filter member (35, 35a) are accommodated in the guide (32).

  According to this, when the filter member is assembled to the housing together with other components, the filter member is less likely to hit the housing and be damaged.

  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.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 shows a piping configuration of a brake device that employs an ABS actuator (brake fluid control device) according to a first embodiment of the present invention.

  As shown in FIG. 1, a master cylinder (hereinafter referred to as M / C) 1 and a wheel cylinder (hereinafter referred to as W / C) 2 are connected by a pipeline A. Through this conduit A, the brake fluid can flow from the M / C1 side to the W / C2 side. The pipe A is provided with an electromagnetic valve 3, and the communication / blocking state of the pipe A can be controlled by the electromagnetic valve 3. The electromagnetic valve 3 includes a check valve 31 that allows only the flow of brake fluid from the W / C2 side to the M / C1 side. Details of the electromagnetic valve 3 will be described later.

  Of the pipe A, a pipe B connected to the reservoir 4 is connected to the W / C 2 side (downstream side) of the electromagnetic valve 3. The pipe line B is provided with a pressure reduction control valve 5, and the pressure reduction control valve 5 can control the communication / blocking state of the pipe line B. The decompression control valve 5 is in a shut-off state during normal braking, and is brought into a communication state at the decompression timing during the ABS control so that the brake fluid in the pipeline A is released to the reservoir 4 to reduce the W / C pressure. Operates as follows.

  Further, the pipeline A connects the reservoir 4 to the M / C 1 side (upstream side) of the electromagnetic valve 3 in the pipeline A. The pipe C is provided with a pump 6 for sucking and discharging the brake fluid released to the reservoir 4 and returning the brake fluid to the M / C1 side.

  FIG. 2 shows the solenoid valve 3 and a part of the housing 7 in the ABS actuator. A reservoir 4 (see FIG. 1) and a pump 6 (see FIG. 1) are housed in an aluminum housing 7. In addition, a pressure reduction control valve 5 (see FIG. 1) is arranged side by side along with the electromagnetic valve 3 on one side surface of the housing 7.

  The housing 7 is formed with a stepped columnar assembly hole 71 used for assembly of the electromagnetic valve 3. The first fluid passage 72 communicates with the bottom of the assembly hole 71, and the second fluid passage 73 communicates with the side surface of the assembly hole 71. The first fluid passage 72 is connected to M / C1 via a pipeline A, and the second fluid passage 73 is connected to W / C2 via a pipeline.

  The electromagnetic valve 3 includes a guide 32 that forms a magnetic path member made of a magnetic metal. The guide 32 is formed in a stepped columnar shape, the large-diameter portion 321 side of the guide 32 is fitted into the assembly hole 71 of the housing 7, and the small-diameter portion 322 of the guide 32 projects out of the assembly hole 71.

  Then, the distal end side of the large-diameter portion 321 of the guide 32 is press-fitted into the minimum-diameter hole portion in the assembly hole 71 of the housing 7, and the open end 711 of the assembly hole 71 is caulked, whereby the deformed portion 712 of the housing 7. Is engaged with the flange portion 323 of the guide 32, whereby the guide 32 is fixed and liquid-sealed to the housing 7.

  In the guide 32, a cylindrical shaft 33 is slidably held on the small diameter portion 322 side, and a bottomed cylindrical valve seat 34 is press-fitted on the large diameter portion 321 side. The guide 32 is formed with a guide portion communication hole 325 that allows the space 324 surrounded by the guide 32, the shaft 33, and the valve seat 34 to communicate with the second fluid passage 73.

  The shaft 33 is formed of a non-magnetic metal (for example, stainless steel), and a spherical first valve body 331 is fixed to the tip of the valve seat 34 by welding or the like.

  The valve seat 34 is formed with a first communication hole 341 that allows the first fluid passage 72 and the second fluid passage 73 to communicate with each other via the space 324 and the guide portion communication hole 325 at the center in the radial direction of the bottom portion. Yes. The first communication hole 341 is opened and closed by the first valve body 331.

  Further, a second communication hole 342 that communicates the first fluid passage 72 and the second fluid passage 73 via the space 324 and the guide portion communication hole 325 is provided in parallel with the first communication hole 341 at the bottom of the valve seat 34. Is formed.

  The second communication hole 342 is opened and closed by a spherical check valve 31 corresponding to the second valve body of the present invention. Specifically, the check valve 31 is disposed opposite to the opening end portion on the first fluid passage 72 side in the second communication hole 342, and the pressure of the first fluid passage 72 is increased in the second fluid passage 73. When the pressure is higher than the pressure, the check valve 31 closes the second communication hole 342, and when the pressure of the first fluid passage 72 is lower than the pressure of the second fluid passage 73, the check valve 31 opens the second communication hole 342. It has become. The valve seat 34 is manufactured by pressing or cold forging.

  With the check valve 31 inserted into the valve seat 34, the first filter member 35 is press-fitted into the valve seat 34, whereby the check valve 31 is connected to the second communication hole 342 in the first filter member 35. It is held at the opposite position. The first filter member 35 has a main body portion 351 formed of a resin in a bottomed cylindrical shape, and a filter portion communication hole 352 for communicating the first and second communication holes 341 and 342 with the first fluid passage 72. A net 353 that is formed at the bottom of the part 351 and collects foreign matter in the brake fluid is provided in the opening of the main body 351.

  As described above, by press-fitting the first filter member 35 into the valve seat 34, the check valve 31, the valve seat 34, and the first filter member 35 are integrated, and the seat assembly 31, 34, 35. Is configured. The check valve 31, the valve seat 34, and the first filter member 35 are preliminarily integrated as a seat portion assembly and then press-fitted into the guide 32. Incidentally, the sheet assembly is inserted into the guide 32 until all the parts of the first filter member 35 are accommodated in the guide 32.

  A second filter member 36 is disposed on the outer periphery of the large diameter portion 321 of the guide 32 so as to surround the guide portion communication hole 325. The first filter member 35 and the second filter member 36 prevent foreign matters mixed in the brake fluid from entering the electromagnetic valve 3.

  A sleeve 37 is fitted on the outer peripheral side of the small diameter portion 322 of the guide 32. The sleeve 37 is made of a non-magnetic metal (for example, stainless steel) and has a cup shape with one end opened. Has a substantially spherical shape.

  A substantially cylindrical plunger 38 made of a magnetic metal is disposed on the bottom surface side of the sleeve 37, and the plunger 38 can slide within the sleeve 37. The plunger 38 is in contact with the bottom surface of the sleeve 37. When the plunger 38 is in contact with the bottom surface of the sleeve 37, sliding of the plunger 38 in the upward direction on the paper surface is restricted.

  The shaft 33 is urged toward the plunger 38 by a spring 39 disposed between the shaft 33 and the valve seat 34, and the shaft 33 and the plunger 38 are always in contact with each other so as to operate integrally. .

  A coil 40 that forms a magnetic field when energized is disposed on the outer peripheral side of the small diameter portion 322 of the guide 32 or around the sleeve 37. A yoke 41 made of a magnetic metal is disposed so as to surround the coil 40.

  Next, the operation of the brake device will be described with reference to FIGS. FIG. 2 shows the operating state of the solenoid valve 3 during normal braking, that is, when the coil is not energized. When the coil is not energized, the spring 39 urges the shaft 33 and the plunger 38 toward the bottom surface of the sleeve 37, the first valve body 331 of the shaft 33 is separated from the valve seat 34, and the first communication path 341 is opened. It will be in the state. Therefore, the first fluid passage 72 and the second fluid passage 73 are in communication with each other via the filter portion communication hole 352, the first communication passage 341, the space 324 in the guide 32, and the guide portion communication hole 325. Sometimes the brake fluid flows between M / C1 and W / C2 according to the operation of the brake pedal.

  On the other hand, the coil 40 is energized at the time of pressure reduction during the ABS control and at the holding timing, that is, when the electromagnetic valve 3 is closed. When the coil is energized, the coil 40 forms a magnetic field, and a magnetic path is formed by the guide 32, the plunger 38, and the yoke 41. Then, the plunger 38 is attracted to the guide 32 side by the magnetic attraction force, the shaft 33 and the plunger 38 are moved toward the valve seat 34 against the spring 39, and the first valve body 331 of the shaft 33 is moved to the valve seat 34. The first communication passage 341 is closed. As a result, the electromagnetic valve 3 is closed and the flow of brake fluid from the first fluid passage 72 to the second fluid passage 73 is prevented.

  When the pressure increase timing during the ABS control is reached, the energization of the coil 40 is stopped, the electromagnetic valve 3 is opened, and the brake fluid flows from the first fluid passage 72 to the second fluid passage 73.

  In addition, when the depression of the brake pedal is stopped during the pressure reduction timing or holding timing of the ABS control, that is, when the solenoid valve 3 is closed, the check valve 31 is caused by the pressure difference between the M / C1 side and the W / C2 side. The second communication hole 342 is opened away from the valve seat 34. Therefore, the first fluid passage 72 and the second fluid passage 73 are in communication with each other via the filter portion communication hole 352, the second communication passage 342, the space 324 in the guide 32, and the guide portion communication hole 325, and W / Brake fluid flows from the C2 side toward the M / C1 side.

  In the present embodiment described above, since the check valve 31 is held by the first filter member 35, the conventional holding member can be eliminated, and the part manufacturing cost and assembly man-hour can be reduced.

  Further, since the distal end side of the large diameter portion 321 of the guide 32 is press-fitted into the minimum diameter hole portion in the assembly hole 71 of the housing 7, in other words, the metal housing 7 and the metal guide 32 are brought into close contact with each other. Therefore, the difference in linear expansion coefficient between the two is small, and a good sealing property can be obtained at the close contact portion between the two.

  Further, since the check valve 31, the valve seat 34, and the first filter member 35 are disposed in the guide 32, the axial length of the solenoid valve 3 is shortened, and the solenoid valve 3 can be made compact. .

  Further, by integrating the check valve 31, the valve seat 34, and the first filter member 35 into a seat portion assembly, the flow rate characteristics of the first communication hole 321 and the check valve in the state of the seat portion assembly. It becomes possible to perform a preliminary inspection of the airtight performance when the valve 31 is closed, and the defective sheet portion assembly can be eliminated at this point. Therefore, in the inspection after being assembled as the electromagnetic valve 3, the probability that a flow characteristic failure or airtight performance failure will occur is reduced.

  Further, since the check valve 31, the valve seat 34, and the first filter member 35 are integrated to form a seat portion assembly, assembly to the guide 32 is easy. In addition, since the sheet 32 is press-fitted into the guide 32, the assembly of the sheet portion assembly to the guide 32 is easy.

  Further, since the check valve 31 and the first filter member 35 are accommodated in the valve seat 34 and the space in the valve seat 34 is effectively used, the electromagnetic valve 3 can be reduced in size.

  In addition, since all the parts of the first filter member 35 are accommodated in the guide 32, when the first filter member 35 is assembled to the housing 7 together with other components, the first filter member 35 is disposed in the housing 7. It is less likely to break when hit.

  In the above embodiment, the mesh portion 353 of the first filter member 35 is provided in the opening of the main body portion 351. However, it may be provided on the side surface of the main body portion 351 as shown in FIG. When the mesh portion 353 is provided on the side surface of the main body portion 351 as described above, the area of the mesh portion 353 of the filter can be increased, the flow path area can be increased, and the fluid resistance can be reduced.

  In the case of the example in FIG. 3, the brake fluid passage between the outer peripheral surface of the main body 351 located on the check valve 31 side and the inner peripheral surface of the valve seat 34 may be formed in the entire circumferential direction. Alternatively, it may be formed only in a part in the circumferential direction.

(Second Embodiment)
FIG. 4 is a view showing the solenoid valve 3 and a part of the housing 7 in the ABS actuator according to the second embodiment of the present invention. In the present embodiment, the configuration of the sheet assembly is different from that of the first embodiment. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 4, the bottomed cylindrical valve seat 34a has a large-diameter portion 343 formed on the opening side and a small-diameter portion 344 formed on the bottom side. The mesh part 353a of the first filter member 35a is provided at the bottom of the bottomed cylindrical main body part 351a.

  Then, in a state where the check valve 31 is inserted into the first filter member 35a, the small diameter portion 344 of the valve seat 34a is press-fitted into the first filter member 35a, whereby the check valve is operated by the first filter member 35a. 31 is held at a position facing the second communication hole 342, and the check valve 31, the valve seat 34 a, and the first filter member 35 a are integrated to form the seat assembly 31, 34 a, 35 a. ing.

  The check valve 31, the valve seat 34a, and the first filter member 35a are preliminarily integrated as a seat portion assembly and then press-fitted into the guide 32. Incidentally, in the seat portion assembly, since the large diameter portion 343 of the valve seat 34 a has the maximum diameter, the seat portion assembly is fixed to the guide 32 by the engagement of the large diameter portion 343 and the guide 32. Yes.

  In the present embodiment described above, since the check valve 31 is held by the first filter member 35a, the conventional holding member can be eliminated, and the part manufacturing cost and assembly man-hour can be reduced.

  In addition, since the metal housing 7 and the metal guide 32 are in close contact with each other, the difference in linear expansion coefficient between them is small, and good sealing performance can be obtained at the close contact portion between the two.

  In addition, since the check valve 31, the valve seat 34a, and the first filter member 35a are disposed in the guide 32, the axial length of the electromagnetic valve 3 is shortened, and the electromagnetic valve 3 can be reduced in size. .

  Further, by integrating the check valve 31, the valve seat 34a, and the first filter member 35a into a seat portion assembly, the flow rate characteristics of the first communication hole 321 and the check valve in the state of the seat portion assembly are obtained. It becomes possible to perform a preliminary inspection of the airtight performance when the valve 31 is closed, and the defective sheet portion assembly can be eliminated at this point. Therefore, in the inspection after being assembled as the electromagnetic valve 3, the probability that a flow characteristic defect or a gas tight performance defect occurs is reduced, so that the cost can be reduced.

  Further, since the check valve 31, the valve seat 34a, and the first filter member 35a are integrated to form a seat portion assembly, assembly to the guide 32 is easy. In addition, since the sheet 32 is press-fitted into the guide 32, the assembly of the sheet portion assembly to the guide 32 is easy.

Further, since all the parts of the first filter member 35a are accommodated in the guide 32, when the first filter member 35a is assembled to the housing 7 together with other parts, the first filter member 35a is moved to the housing 7. It is less likely to break when hit. (Other embodiments)
In each of the above embodiments, the present invention is applied to an ABS actuator, but the present invention can be applied to various brake fluid control devices that open and close a fluid passage by an electromagnetic valve.

It is a figure which shows the piping structure of the brake device which employ | adopts the brake fluid control apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the principal part of the fluid control apparatus for brakes concerning 1st Embodiment. It is sectional drawing which shows the modification of the brake fluid control apparatus which concerns on 1st Embodiment. It is sectional drawing which shows the principal part of the fluid control apparatus for brakes concerning 2nd Embodiment. It is sectional drawing which shows the principal part of the conventional brake fluid control apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Solenoid valve, 31 ... Check valve (2nd valve body), 32 ... Guide, 331 ... 1st valve body, 34, 34a ... Valve seat, 341 ... 1st communication hole, 342 ... 2nd communication hole, 35 35a ... Filter member, 40 ... Coil, 7 ... Housing, 71 ... Assembly hole, 72 ... First fluid passage, 73 ... Second fluid passage.

Claims (5)

A metal housing (7) and a solenoid valve (3);
The housing is
An assembly hole (71) into which a part of the solenoid valve is inserted;
First and second fluid passages (72, 73) communicating with the assembly holes and allowing fluid to flow therethrough,
The solenoid valve is
A cylindrical metal guide (32) whose one end is inserted into the assembly hole;
A coil (40) disposed on the outer periphery of the other end of the guide;
A valve seat (34, 34a) in which first and second communication holes (341, 342) for communicating between the first and second fluid passages are formed;
A first valve body (331) for opening and closing the first communication hole in response to the presence or absence of energization of the coil;
A second valve body (31) for opening and closing the second communication hole according to a pressure difference between the first and second fluid passages;
A filter member (35, 35a) for collecting foreign matter in the fluid,
The outer peripheral surface on one end side of the guide is closely attached to the assembly hole of the housing,
The valve seat, the second valve body, and the filter member are disposed in the guide;
Further, the brake fluid control device is configured such that the second valve body is held by the filter member at a position facing the second communication hole. The valve seat (34, 34a), the second valve body (31), and the filter member (35, 35a) are integrated to form a seat portion assembly. The fluid control apparatus for brakes as described. The said valve seat (34) is a bottomed cylindrical shape, The said 2nd valve body (31) and the said filter member (35) are arrange | positioned in the said valve seat, The Claim 1 or 2 characterized by the above-mentioned. The fluid control apparatus for brakes as described. The brake fluid control device according to any one of claims 1 to 3, wherein the seat assembly is press-fitted into the guide (32). The brake fluid control device according to any one of claims 1 to 4, wherein all the parts of the filter member (35, 35a) are accommodated in the guide (32).

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