JP4745802B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve, and more particularly to an electromagnetic valve (solenoid valve) suitable for a hydraulic brake device that realizes brake assist control of a vehicle such as an ABS (Anti-lock Braking System).

  An electromagnetic valve used in a hydraulic brake device that realizes brake assist control of a vehicle such as ABS is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-142353 (Patent Document 1).

  FIG. 3 is a diagram showing a hydraulic circuit 100 used in a vehicle brake system.

  The hydraulic circuit shown in FIG. 3 includes a master cylinder (hereinafter referred to as “M / C”), a hydraulic brake device (brake actuator) 1 surrounded by a broken line, and four wheel cylinders (hereinafter referred to as “front and rear, left and right”). W / C ”). Further, the hydraulic brake device 1 includes four holding electromagnetic valves 10 shown in the upper part of the figure, four pressure reducing electromagnetic valves 11 shown in the lower part, and two systems corresponding to four brake oil passages of four W / C systems. Pump P and reservoir R.

  In the hydraulic circuit 100 shown in FIG. 3, the hydraulic path of the four wheels is controlled by switching the hydraulic path to three modes (pressure increase / hold / pressure reduction).

  4 is a cross-sectional view showing a schematic configuration of the electromagnetic valve 10 shown in FIG.

  The electromagnetic valve 10 shown in FIG. 4 is an electromagnetic valve for pressure increase control generally used for automobile brake control, and mainly includes an electromagnet device 11, a plunger 12, a shaft 13, a valve body 14, a seat valve 15, and the like.

  The electromagnet device 11 includes a guide 16, a solenoid 17, a yoke 18, and the like. The guide 16 is made of a magnetic material and has a vertical through-hole 21. The through hole 21 has an upper portion formed in a small diameter and a lower portion formed in a large diameter. The guide 16 corresponds to a stator, and when the solenoid 17 is energized, a magnetic path is formed in the electromagnet device 11, and the guide 16 functions as an electromagnet.

  The plunger 12 is made of a magnetic material and is arranged so as to move up and down.

  The shaft 13 is made of a non-magnetic material, and is disposed in the small diameter portion of the through hole 21 of the guide 16 so as to be slidable in the vertical direction. A lower portion of the shaft 13 is disposed in a large diameter portion of the through hole 21, and a ball-shaped valve body 14 is integrally joined to the lower end of the shaft 13 by, for example, welding or caulking. Both the plunger 12 and the shaft 13 are interlocked with the valve body 14 and stroke along the through hole 21 of the guide 16 and correspond to a mover.

  The seat valve 15 is made of a magnetic material or a non-magnetic material, and is press-fitted into the large diameter portion of the through hole 21 of the guide 16. Of the large diameter portion of the through hole 21, the upper space of the seat valve 15 is a valve chamber 30. The seat valve 15 is formed with an upstream side passage 31 and a passage 32 with a check valve. The upstream passage 31 is a passage for supplying M / C brake oil to the valve chamber 30 via the filter 36 and penetrates the seat valve 15 in the vertical direction. In front of the opening 31a on the valve chamber side in the upstream side passage 31, an orifice 31b for regulating the flow rate of the brake oil flowing from the M / C to the W / C is formed. Further, the opening 31 a on the valve chamber side of the upstream side passage 31 is formed as a tapered seat surface that widens toward the valve chamber 30. The opening 31a is in a position facing the valve body 14, and is closed by the valve body 14 when the valve is closed. The check valve-equipped passage 32 is formed substantially parallel to the upstream side passage 31, and the check valve 33 is opened when the hydraulic pressure of the valve chamber 30 exceeds the hydraulic pressure of the upstream side passage 31. It plays a role of lowering the pressure.

  The downstream passage 35 is a passage for supplying the brake oil of the valve chamber 30 to the W / C through the filter 37 and is formed so as to penetrate the guide 16 from the valve chamber 30 in the horizontal direction. Although the downstream side passages 35 are provided in two directions, the brake oil delivered from both downstream side passages 35 passes through the filter 37 and is then combined into one and supplied to the W / C.

  As described above, the electromagnetic valve 10 includes a flow passage formed so that the brake oil reaches the downstream passage 35 from the upstream passage 31 through the valve chamber 30.

When the solenoid 17 of the electromagnet device 11 is not energized, the valve body 14, the shaft 13, and the plunger 12 have a balance of the urging forces of the springs provided above and below the shaft 13 and the plunger 12, as shown in FIG. The valve body 14 is held so as to open the opening 31a.
JP 2000-142353 A

  FIG. 5A is an enlarged cross-sectional view of the tip of the conventional solenoid valve 10 shown in FIG. 5A and 4 show the solenoid valve 10 upside down. FIG. 5B is an enlarged top view and side view showing the filter 36.

  As shown in FIG. 5A, the check valve 33 of the electromagnetic valve 10 has the following structure. That is, the seat valve 15 is formed with a second valve body chamber r2 in which the flow path diameter of the passage 32 is set larger than that on the inner side from the end surface on the front end side toward the inner side. Further, a ball-like second valve body b2 that is moved by a fluid pressure difference between the front end side and the inner side and opens and closes the passage 32 is inserted into the second valve body chamber r2.

  As shown in FIG. 5B, the filter 36 has the following structure. That is, the filter 36 includes a net-like filtration part f and an annular flange t that holds the filtration part f. Moreover, the columnar part tm which protruded toward the upstream M / C side and the columnar part tw which protruded toward the downstream W / C side are formed in the both end surfaces of the collar part t.

  As shown in FIG. 5A, the filter 36 has the columnar portion tw inserted into the second valve body chamber r2 so that the end surface of the flange portion t abuts on the end surface on the front end side of the seat valve 15. Be placed. In the filter 36, as can be seen from the figure, the lift amount of the ball-shaped second valve body b2 is determined by the columnar portion tw formed in the flange portion t of the filter 36. On the other hand, the columnar portion tm formed on the opposite side is for determining the front and back of the filter 36.

  In the electromagnetic valve 10 shown in FIG. 5A, the lift amount of the second valve element b2 is set by the columnar part tw of the filter 36, but when the filter 36 is assembled, the second valve element chamber r2 of the columnar part tw is moved to the second valve element chamber r2. Positioning in the direction of rotation is necessary. For this reason, the assembly man-hour of the filter 36 increases and manufacturing cost increases. Moreover, when positioning is bad, the malfunction that the columnar part tw is damaged by the corner | angular part of the 2nd valve body chamber r2 generate | occur | produces.

  Accordingly, an object of the present invention is to solve the above-described problems of the conventional solenoid valve, to set the lift amount of the valve body of the check valve by a filter, to suppress a scratched defect during the assembly of the filter, and to facilitate the assembly. The object is to provide a solenoid valve that can be manufactured at low cost.

The electromagnetic valve according to claim 1 is configured such that the inside of the tip of the cylindrical housing forms a fluid flow path, and a cylindrical valve seat part that partitions the flow path is disposed inside the front end of the housing. In the valve seat part, the first flow path and the second flow path of the fluid penetrating through the end faces on both sides are formed substantially in parallel, move by electromagnetic force, and open and close the first flow path. The first valve body is disposed opposite to the opening of the first flow path on the inner end face of the valve seat component, and the flow path diameter of the second flow path is set larger than that of the inner side. A two-valve body chamber is formed from the end face on the front end side of the valve seat part toward the inner side, is moved by a fluid pressure difference between the front end side and the inner side, and opens and closes the second flow path. A valve body is disposed by being inserted into the second valve body chamber, and at least one of holding a reticulated filtration part and the filtration part A filter having an annular flange with a flat end surface is disposed with the flat end surface of the flange contacting the end surface on the distal end side of the valve seat component, and a filter on the end surface on the distal end side of the valve seat component. An opening of the two-valve body chamber is covered with the flange, and the second valve body is an electromagnetic valve confined in the second valve body chamber, and the flange of the filter is the ring The opening part of the 2nd valve body chamber in the end surface by the side of the front-end | tip of the said valve seat component is covered with one of the said protrusions .

In the solenoid valve, the opening of the second valve body chamber is covered by the flange of the filter, and the second valve body that is the valve body of the check valve is confined in the second valve body chamber. Therefore, the lift amount of the second valve body can be set to a predetermined value by appropriately setting the depth from the end surface on the front end side of the second valve body chamber toward the inside. Moreover, since the flange part of the filter that covers the opening part is a flat end surface, it is possible to suppress the occurrence of scratching defects such as a filter having a conventional columnar part when assembling the filter, regardless of positioning accuracy. be able to. For this reason, it can be set as the solenoid valve which can be assembled easily and can be manufactured at low cost.
Further, the flange portion of the filter in the electromagnetic valve has a plurality of protrusions directed toward the center of the ring, and the opening of the second valve body chamber on the end surface on the tip side of the valve seat part is A structure in which the second valve body is confined in the second valve body chamber by being covered with the protrusion.
As described above, in the electromagnetic valve, a plurality of protrusions facing the center of the annular ring are formed on the flange portion of the filter, and the flange portion of the filter that covers the opening of the second valve body chamber is provided with the plurality of protrusions. It is limited to either. According to this, compared with the case where no protrusion is formed, the width of the flange portion can be reduced, and the area of the filter flange portion occupying the flow path area can be reduced, and the filtration efficiency of the filter by the flange portion is reduced. Can be suppressed. In this case, ensuring the strength of the filter and ensuring the filtration efficiency can be achieved at the same time by appropriately setting the width of the collar portion for securing the strength and the area and arrangement of the plurality of protrusions.
Moreover, in the said solenoid valve, when installing a filter, positioning in a rotation direction can be made unnecessary by arrange | positioning a some protrusion suitably. For this reason, the number of steps for assembling the filter is reduced, and this also makes it possible to provide an electromagnetic valve that can be easily assembled and manufactured at low cost.

In the electromagnetic valve, as described in claim 2 , it is preferable that the plurality of protrusions are rotationally symmetric with respect to the center of the ring.

  According to this, positioning in the rotation direction is not necessary, and the strength of the flange portion of the filter can be set uniformly.

In the solenoid valve, as described in claim 3 , the distance from the center of the ring to the center of the second valve body chamber from the center of the circle on the end face on the distal end side of the valve seat part is defined as a radius. On the circumference, the length of the arc cut by the adjacent protrusion is set to be smaller than the diameter of the ball of the second valve body, so that positioning in the rotational direction becomes unnecessary. .
In addition, in the said solenoid valve, as described in Claim 4, the said 1st flow path is arrange | positioned in the center of the said cylinder, and the said 2nd flow path is arrange | positioned in the outer periphery vicinity of the said cylinder. Is preferred. In this case, as described above, the width of the flange portion can be reduced, and the area of the flange portion of the filter that occupies the flow path area can be reduced. Therefore, since the area of a collar part becomes small with respect to the filtration part of a filter, the fall of the filtration efficiency of the filter by a collar part can be suppressed.

According to a fifth aspect of the present invention, in the electromagnetic valve, both end surfaces of the flange portion of the filter may be flat.

  In this case, the determination of the front and back of the filter can be made unnecessary. This also reduces the number of steps for assembling the filter, and the electromagnetic valve can be manufactured easily and inexpensively.

The solenoid valve is a small solenoid valve having a first valve body movable by electromagnetic force and a second valve body movable by a fluid pressure difference, and can be easily assembled and manufactured at low cost. For this reason, as described in claim 6 , the electromagnetic valve is suitable for use in a hydraulic brake device of a vehicle. In the electromagnetic valve, the lift amount of the valve body of the check valve can be set as appropriate by a filter, whereby the response speed of the hydraulic brake device can be set to a predetermined value.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 is an example of a basic solenoid valve that is not the present invention , and FIG. 1 (a) is a cross-sectional view showing the tip of the solenoid valve 10a. FIG. 1B is an enlarged top view and side view showing the filter 36a shown in FIG. Incidentally, FIG. 1 (a), (b), the electric solenoid valve figure tip and filter 36a of 10a 5 (a), as compared to the tip and the filter 36 of a conventional solenoid valve 10 shown in (b) In the figure, the structure other than the tip of the electromagnetic valve 10a shown in FIG. 1A is the same as that of the electromagnetic valve 10 shown in FIG.

  A solenoid valve 10a shown in FIG. 1 (a) is a pressure increase control solenoid valve generally used for automobile brake control, and a fluid (brake oil) flow path is formed inside a cylindrical housing tip 16a. Yes. A cylindrical valve seat component 15a that partitions a fluid flow path is disposed inside the housing front end portion 16a. Further, in the valve seat part 15a, a first flow path h1 and a second flow path h2 of fluid penetrating the end faces 15i and 15o on both sides are formed substantially in parallel. Note that the housing front end 16a, the valve seat part 15a, the first flow path h1, and the second flow path h2 of the electromagnetic valve 10 shown in FIG. 1A are respectively the front end of the guide 16 in the electromagnetic valve 10 of FIG. , Corresponding to the seat valve 15, the upstream side passage 31, and the passage 32 with check valve.

  In the electromagnetic valve 10a of FIG. 1A, the first valve body b1 that is moved by electromagnetic force and opens and closes the first flow path h1 is an opening of the first flow path h1 on the inner end face 15i of the valve seat component 15a. It is arranged to face the part. In addition, a second valve body chamber r2a in which the flow path diameter of the second flow path h2 is set larger than that on the inner side is formed from the end face 15o on the distal end side of the valve seat part 15a toward the inner side. Further, a ball-like second valve body b2 that is moved by a fluid pressure difference between the front end side and the inner side and opens and closes the second flow path h2 is inserted and disposed in the second valve body chamber r2a. The first valve body b1 of the electromagnetic valve 10 shown in FIG. 1A is the same as the ball-shaped valve body 14 in the electromagnetic valve 10 of FIG.

  In the electromagnetic valve 10a of FIG. 1A, unlike the electromagnetic valve 10 shown in FIG. 5A, the net-like filtration part f shown in FIG. 1B and one end face ti holding the filtration part f are flat. A filter 36a having an annular collar portion ta is used. As shown in FIG. 1B, the flange portion ta of the filter 36a has one protrusion tak that faces the center of the ring of the flange portion ta.

  As shown in FIG. 1A, the filter 36a is arranged so that the flat end surface ti of the flange portion ta contacts the end surface 15o on the distal end side of the valve seat part 15a. Thus, in the electromagnetic valve 10a, the opening of the second valve body chamber r2a on the end face 15o on the distal end side of the valve seat part 15a is covered with the protrusion tak of the flange part ta of the filter 36a, and the second valve body b2 is The second valve body chamber r2a is confined in the structure. The columnar portion tm formed on the opposite side of the flat end surface ti of the filter 36a is for determining the front and back of the filter 36a and is the same as the columnar portion tm of the filter 36 shown in FIG. As will be described later, when the front / back determination of the filter is not necessary, the columnar portion tm may be deleted, and the both end surfaces of the collar portion may be a flat filter.

  In the electromagnetic valve 10a shown in FIG. 1A, the opening of the second valve body chamber r2a is covered by the flange ta of the filter 36a, and the second valve body b2 that is the valve body of the check valve is the second valve. It is confined in the body chamber r2a. Therefore, the lift amount of the second valve body b2 can be set to a predetermined value by appropriately setting the depth d from the end face 15o on the distal end side of the second valve body chamber r2a toward the inside.

  In addition, since the flange portion ta of the filter 36a that covers the opening has a flat end surface ti, the filter 36 having the conventional columnar portion tw shown in FIG. Generation | occurrence | production of the defect | defect with a crack like this can be suppressed. For this reason, the electromagnetic valve 10a of FIG. 1A can be an electromagnetic valve that can be easily assembled and manufactured at low cost.

  In the electromagnetic valve 10a shown in FIG. 1A, the first flow path h1 is disposed at the center of the cylinder of the valve seat part 15a, and the second flow path h2 is near the outer periphery of the cylinder of the valve seat part 15a. Is arranged. Thereby, the width w of the flange part ta of the filter 36a can be reduced, and the area of the flange part ta of the filter 36a occupying the flow path area can be reduced. In this case, since the area of the collar part ta becomes small with respect to the filtration part f of the filter 36a, the fall of the filtration efficiency of the filter 36a by the collar part ta can be suppressed.

  As described above, it is preferable that the first flow path h1 is disposed at the center of the cylinder of the valve seat part 15a, and the second flow path h2 is disposed near the outer periphery of the cylinder of the valve seat part 15a. However, the electromagnetic valve in the present invention is not limited to this, and the first flow path h1 and the second flow path h2 may be in another arrangement relationship with respect to the cylindrical valve seat part 15a.

  Further, in the electromagnetic valve 10a of FIG. 1A, a protrusion tak toward the center of the annular ring is formed on the flange portion ta of the filter 36a, and the flange of the filter 36a that covers the opening of the second valve body chamber r2a. The part ta is limited to the protrusion tak. Therefore, the width w of the flange portion ta can be reduced by this, and the area of the flange portion ta of the filter 36a occupying the flow path area can be reduced, and the decrease in the filtration efficiency of the filter 36a by the flange portion ta is suppressed. can do. In this case, the strength of the filter 36a is ensured by appropriately setting the width w of the flange portion ta for securing the strength and the area and arrangement of the protrusion tak that covers the opening of the second valve body chamber r2a. And ensuring filtration efficiency can be achieved in a suitable manner.

As described above, it is preferable to form the protrusion tak toward the center of the ring at the flange portion ta of the filter 36a and cover the opening of the second valve body chamber b2 with the protrusion tak. However, you may make it cover the opening part of the 2nd valve body chamber b2 in the part of the width w of a collar part as follows .

FIG. 2 is an example of an electromagnetic valve according to the present invention, and FIG. 2 (a) is a cross-sectional view showing the tip of the electromagnetic valve 10b. FIG. 2B is an enlarged top view and side view showing the filter 36b shown in FIG. The structure of the electromagnetic valve 10a shown in FIG. 2A is the same as that of the electromagnetic valve 10 shown in FIG. Moreover, in the front-end | tip part of the solenoid valve 10b shown to Fig.2 (a), the same code | symbol was attached | subjected about the part similar to the front-end | tip part of the solenoid valve 10a shown to Fig.1 (a).

  The electromagnetic valve 10b shown in FIG. 2A is also a pressure-increasing control electromagnetic valve generally used for automobile brake control, and the inside of the cylindrical housing front end portion 16b is a fluid (brake oil) flow path. Yes.

  Unlike the filter 36a used in the electromagnetic valve 10a shown in FIG. 1A, the filter 36b used in the electromagnetic valve 10b shown in FIG. 2A has flat end surfaces ti of the flange portion tb. In addition, the filter 36a used in the electromagnetic valve 10a of FIG. 1A has a single protrusion tak formed on the collar portion ta toward the center of the ring, but the filter used in the electromagnetic valve 10b. As shown in FIG. 2B, the flange portion tb of 36b has a plurality of protrusions tbk that face the center of the ring. In the electromagnetic valve 10b shown in FIG. 2A, the opening of the second valve body chamber r2a on the end surface 15o on the distal end side of the valve seat part 15a is covered with any protrusion tbk of the flange tb of the filter 36b. The second valve body b2 is confined in the second valve body chamber r2a.

  In the electromagnetic valve 10b shown in FIG. 2A, the plurality of protrusions tbk are arranged rotationally symmetrically with respect to the center of the ring of the flange tb, whereby the strength of the flange tb of the filter 36b is increased. It is set to be even. Further, in the electromagnetic valve 10b, as shown in FIG. 2B, from the center of the ring of the flange tb, from the center of the circle on the end face 15o on the front end side of the valve seat part 15a shown in FIG. On the circumference whose radius is the distance R to the center of the second valve body chamber r2a, the length L of the arc cut by the adjacent protrusion tbk is set smaller than the diameter D2 of the ball of the second valve body b2. ing. This eliminates the entry of the second valve element b2 into the filter part f of the filter 36b, so that positioning in the rotational direction is not necessary when the filter 36b is assembled. In this case, the lift amount of the second valve body b2 is slightly different depending on the arrangement of the protrusion tbk with respect to the opening of the second valve body chamber r2a in the assembled state, but the response of the check valve is almost the same. Absent.

  As described above, in the solenoid valve 10b shown in FIG. 2A, when the filter 36b is assembled, the positioning of the filter 36b is not required, and the front / back determination of the filter 36b is not required. For this reason, the electromagnetic valve 10b of FIG. 2A is an electromagnetic valve that can be assembled easily and inexpensively because the number of assembling steps of the filter 36b is reduced compared to the electromagnetic valve 10a of FIG. it can.

As indicated above, the solenoid valve 10a electrodeposition described in FIG 1 and FIG 2, 10b is a small electromagnetic valve having a second valve element b2 of movable by the first valve element b1 fluid pressure differential movable by electromagnetic force Thus, assembly is easy and can be manufactured at low cost. For this reason, the solenoid valves 10a and 10b are suitable for use in a hydraulic brake device for a vehicle. In the electromagnetic valves 10a and 10b, the lift amount of the valve body b2 of the check valve can be appropriately set by the filters 36a and 36b, and thereby the response speed of the hydraulic brake device can be set to a predetermined value. Further, the problem of the conventional solenoid valve 10 described with reference to FIG. 5 is solved, and the solenoid valve is configured to suppress damages and defects when the filters 36a and 36b are assembled.

An example of a basic solenoid valve that is not the present invention, (a) is a cross-sectional view showing the tip of the solenoid valve 10a. Moreover, (b) is the top view and side view which expanded and showed the filter 36a shown to (a). In the example of the electromagnetic valve in the present invention, (a) is a cross-sectional view showing the tip of the electromagnetic valve 10b. (B) is an enlarged top view and side view of the filter 36b shown in (a). It is a figure showing hydraulic circuit 100 used for a brake system of vehicles. It is sectional drawing showing schematic structure of the solenoid valve 10 shown by FIG. 3 disclosed by patent document 1. FIG. (A) is sectional drawing to which the front-end | tip part of the conventional solenoid valve 10 shown in FIG. 4 was expanded. Moreover, (b) is a top view and a side view showing the filter 36 in an enlarged manner.

Explanation of symbols

10, 10a, 10b Solenoid valve 15a Valve seat part 15i End surface 15i End side end surface h1 First flow path b1 First valve body h2 Second flow path r2, r2a Second valve body chamber b2 Second valve body 16a , 16b Housing front end 36, 36a, 36b Filter f Filtration part ta, tb Gutter part tak, tbk Projection ti End face

Claims (6)

The inside of the cylindrical housing front end forms a fluid flow path, and a columnar valve seat part that partitions the flow path is disposed inside the housing front end,
In the valve seat part, the first flow path and the second flow path of the fluid penetrating the end faces on both sides are formed substantially in parallel,
The first valve body that is moved by electromagnetic force and opens and closes the first flow path is disposed to face the opening of the first flow path on the inner end face of the valve seat component,
A second valve body chamber in which the flow path diameter of the second flow path is set larger than the inner side is formed from the end face on the tip side of the valve seat part toward the inner side,
A ball-shaped second valve body that is moved by a fluid pressure difference between the front end side and the inner side and opens and closes the second flow path is inserted into the second valve body chamber,
A filter having a net-like filter portion and an annular flange portion having at least one flat end surface holding the filter portion abuts the flat end surface of the flange portion against the end surface on the front end side of the valve seat component. Arranged,
An electromagnetic valve in which an opening of a second valve body chamber on an end surface on a distal end side of the valve seat part is covered with the flange, and the second valve body is confined in the second valve body chamber. ,
The flange portion of the filter has a plurality of protrusions facing the center of the ring,
An electromagnetic valve characterized in that an opening of the second valve body chamber on the end face on the front end side of the valve seat part is covered with any one of the protrusions . Wherein the plurality of protrusions with respect to the center of the circular ring, solenoid valve according to claim 1, characterized in that arranged in rotational symmetry Rukoto. On the circumference having a radius from the center of the ring to the center of the second valve body chamber from the center of the circle on the end face on the tip side of the valve seat part,
The electromagnetic valve according to claim 1 or 2 , wherein a length of an arc cut by the adjacent protrusion is set to be smaller than a diameter of a ball of the second valve body . The said 1st flow path is arrange | positioned in the center of the said cylinder, and the said 2nd flow path is arrange | positioned in the outer periphery vicinity of the said cylinder, The Claim 1 thru | or 3 characterized by the above-mentioned. solenoid valve.
The solenoid valve according to any one of claims 1 to 4, wherein both end faces of the flange portion of the filter are flat . The electromagnetic valve according to any one of claims 1 to 5, wherein the electromagnetic valve is used in a hydraulic brake device of a vehicle .

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