JP3031524B2 - Poppet valve body for hydraulic control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a poppet valve which is disposed in a stepped piston of a hydraulic pressure control valve and controls the communication of hydraulic fluid by being seated on and off a valve seat formed in the piston. In particular, the present invention relates to a device including a metal shaft portion and a resin valve portion.

[0002]

BACKGROUND OF THE INVENTION Generally, for example, Japanese Utility Model Laid-Open Publication No.
As disclosed in Japanese Patent Publication No. 0, the hydraulic pressure control valve includes a stepped piston in a cylinder hole formed inside the housing.
Inside the stepped piston, the inlet chamber (that is, the inlet side)
There is a communication passage that communicates with the outlet chamber (that is, the outlet side), and a valve device that opens and closes the passage is provided in the middle of the communication passage.

The main body of the valve device is a poppet valve body extending in the same direction as the axial direction of the stepped piston. The poppet valve body is generally integrally formed of a resin material such as nylon or a metal material. However, when integrally formed of a resin material, there is a problem that the poppet valve body vibrates and generates abnormal noise. This abnormal noise occurs especially when using at high temperatures,
According to experiments and the like, it seems that the low rigidity of the shaft portion of the poppet valve element is caused by this. So, to solve this,
It is conceivable to increase the rigidity of the poppet valve element by mixing glass fiber or the like into the resin material. However, a new problem arises in that sealing properties are impaired because glass fibers and the like are raised on the sheet portion and shrinkage during molding is increased.
On the other hand, when integrally formed of a metal material, there is a problem that a stable sealing property cannot be obtained because the metal is sealed.

Therefore, while increasing the rigidity of the shaft portion,
In order to improve sealing properties, for example, Japanese Patent Application Laid-Open No. 58-8 / 1983
As disclosed in Japanese Patent No. 9449, an improved technique has been developed in which a shaft portion is made of a metal material and a valve portion (that is, a seat portion) is molded with a resin material for the shaft portion. However, when we further examined this improved technology,
From another aspect, it has been found that the following seal failure may occur.

[0005] The shaft of the poppet valve element is inserted into a guide hole, which guides the movement of the poppet valve element in the axial direction. There is a certain gap between them. This gap is
The inlet chamber and the outlet chamber are in liquid communication. Due to this gap, the poppet valve body is inclined with respect to the guide hole. When such a poppet valve body made of metal and resin is tilted, there is a possibility that the joint boundary between the valve portion (resin portion) and the shaft portion (metal portion) may contact the valve seat. As a result, such valve arrangements result in poor sealing. Also, when a resin valve is molded to a metal shaft,
It is unavoidable that burrs are generated at the joint boundary, but the burrs bite between the valve portion and the valve seat,
As a result, poor sealing will occur.

[0006] In addition, when a flow mark (unevenness generated on the surface) is formed on the surface of the valve portion during the molding, the flow mark causes poor sealing. The flow mark is generated when the resin material does not flow smoothly in a mold having the shape of the valve portion.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described results, and has been further improved. It is an object of the present invention to improve the rigidity of the shaft portion of a poppet valve body and the sealing performance of the valve portion.
It is an object of the present invention to provide a technique capable of effectively preventing poor sealing between a poppet valve element and a valve seat even when the poppet valve element is inclined. Another object of the present invention is to provide a technique for smoothing the flow of resin and preventing flow marks from being generated in a sheet portion.

[0008]

According to the present invention, there is provided a poppet valve body comprising: a metal shaft extending in an axial direction;
The shaft portion has a resin valve portion integrated therewith. In particular, the valve portion extends in the outer peripheral direction and, in addition to the seat portion that is seated on and off the valve seat, is integrated with the seat portion, And a resin extension shaft extending from the portion toward one end of the metal shaft.

[0009] In such a poppet valve element, even if it is inclined, the resin valve section surely comes into contact with the valve seat.
In other words, the portion of the resin material is securely attached to and detached from the valve seat. When the poppet valve element is not tilted, the seat portion contacts (separates and separates from) the valve seat. On the other hand, even when the poppet valve body is inclined, at least the resin valve portion such as a boundary portion between the seat portion and the resin extension shaft portion contacts (separates and separates from) the valve seat. Therefore, the sealing action between the resin portion and the metal portion can be reliably obtained by the contact between the resin portion and the metal portion. In addition, even if burrs due to molding occur at the joint boundary between the metal part and the resin part, since the joint boundary faces the side of the metal shaft, the burr is formed between the valve seat and the valve part. It does not occur near the seal point between them. Therefore, it is possible to prevent the seal failure due to the bite of the burr.

[0010] The inclination of the poppet valve element is determined by the gap between the shaft and the guide hole. Therefore, the length of the resin extension shaft portion in the axial direction is set in consideration of the size of the gap. In other words, the length of the extension shaft portion is set so that only the valve portion can be seated on and disengaged from the valve seat even when the poppet valve body is fully collapsed due to the gap. At this time, it is also taken into consideration that burrs at the time of molding do not occur near the sealing portion.

Further, it is preferable that the metal shaft has a tapered tip at the side where the resin material is molded, and a gate for molding is provided to face the tapered portion. Then, during molding, the resin material smoothly flows into the mold along the taper.
Thereby, it is possible to prevent the flow mark from being generated on the surface of the valve portion.

[0012]

FIG. 1 is a sectional view of a hydraulic pressure control valve 10 having a poppet valve 300 according to an embodiment of the present invention. FIG. 2 is an enlarged view of the vicinity of the poppet valve 300. FIG. The hydraulic pressure control valve 10 is used for a brake device or the like of a vehicle, and is used here for a so-called X-pipe type brake device. The housing 19 of the hydraulic pressure control valve 10 has an input port 70 connected to the pressure chamber of the master cylinder,
70 ', output ports 81 and 81' connected to the wheel cylinders of the front wheels of the vehicle, and output ports 82 and 82 'connected to the wheel cylinders of the rear wheels. In the housing 19, two regulating valves 11.11 'are provided in parallel. These two regulating valves 11, 11 'have the same configuration. Accordingly, hereinafter, one adjustment valve 11 on the left side of the drawing will be described. The hydraulic pressure control valve 10
The overall configuration itself is, for example,
This is the same as that described in the official gazette of No. 1.

In the housing 19, a stepped cylinder hole 17 runs vertically. The cylinder hole 17 is provided in the cylinder large-diameter hole portion 7 communicating with the input port 70 and the output port 81.
2 and a small-diameter cylinder hole 73 communicating with the output port 82. The stepped piston 16 is located inside the cylinder hole 17. The stepped piston 16 includes a piston large diameter portion 62 and a piston small diameter portion 63 and is slidable in the cylinder hole 17. The piston small diameter portion 63 is located in the cylinder large diameter hole 72 via the cup seal 42 and the slide guide member 45. In addition, the piston large diameter portion 6
2 is located in the cylinder small-diameter hole 73 via the seal member 46.

Inside the large diameter portion 62 of the piston, there is a stepped hole 50 extending in the axial direction. In order to communicate between the inside and the outside of the stepped hole 50, there are communication passages 68 and 65 near the bottom 58 and near the opening 59, respectively. Therefore, the input port 70 communicating with the master cylinder side is directly connected to the output port 81 connected to the wheel cylinder of the front wheel through the inlet chamber 20 around the piston small diameter portion 63, while the input port 70 is connected to the input port 70.
Is connected from the inlet chamber 20 to the output port 82 connected to the wheel cylinder of the rear wheel through the inner periphery of the stepped hole 50.
The valve device V including the poppet valve element 300 in question is located in the valve chamber 53 formed in the stepped hole 50 and has the inlet chamber 2.
It opens and closes a communication path 60 that communicates with the outlet chamber 30.

The valve device V is naturally provided with a poppet valve body 300 extending in the same direction as the axial direction of the stepped piston 16, and a valve seat 56 on which the poppet valve body 300 is to be attached and detached. The poppet valve body 300 includes a metal shaft 310 extending in the axial direction and an umbrella-shaped resin valve 320 located at one end of the metal shaft 310. The poppet valve element 300 can move in the axial direction while the metal shaft 3 10 is guided by the guide holes 57. Along with the movement, the valve portion 320 of the poppet valve body 300 is separated from and seated on the valve seat 56, whereby the valve device V opens and closes. Valve seat 56
Is at the open end of the valve seat forming member 61, and the open end is also one end of the guide hole 57. After the valve seat forming member 61 is press-fitted into the opening 59 of the stepped hole 50, the end of the opening 59 is connected to the stepped piston 16 side by caulking means. Therefore, the valve seat forming member 61
Is usually made of metal. In addition, the poppet valve body 300
Is urged by a valve spring 54 located in the same valve chamber 53 in a direction of sitting on a valve seat 56.

Now, the stepped piston 16 and the valve device V
Consider the function of the hydraulic pressure control valve 10 including the following. Hydraulic pressure control valve 10
In addition to the force based on the difference between the pressure receiving areas applied to the small piston portion 63 and the large piston portion 62, the biasing force of the preload spring 90 is applied to the stepped piston 16. Hydraulic pressure control valve 10
Is normally in the state shown in FIG. 1 by the force of the preload spring 90. That is, the metal shaft portion 31 of the poppet valve 300
0 and the end of the valve seat forming member 61 are in contact with the bottom 78 of the cylinder hole 17 (the inner wall of the housing 19). In this state, the poppet valve 300 is separated from the valve seat 56, and the valve device V is in an open state. Therefore, when a depression force is applied to the brake pedal of the vehicle and a hydraulic pressure is generated in each pressure chamber of the master cylinder, the hydraulic pressure is guided from the input port 70 to the front wheel cylinder through the inlet chamber 20 and the output port 81, and It is guided to the wheel cylinder of the rear wheel through the inlet chamber 20, the valve device V, the outlet chamber 30, and the output port 82.

Thereafter, the hydraulic pressure in the outlet chamber 30 increases, and the force of the differential pressure due to the difference in the pressure receiving area is applied to the preload spring 9.
When the urging force of 0 is overcome, the stepped piston 16 slides toward the preload spring 90. As the stepped piston 16 slides, the end of the valve seat forming member 61 and the end of the poppet valve body 300 move away from the bottom 78 of the cylinder hole 17. In response, the valve portion 320 of the poppet valve body 300 is seated on the valve seat 56 by the urging force of the valve spring 58, and the valve device V is closed. By closing the valve device V, the inlet chamber 20 and the outlet chamber 30 are shut off, and the hydraulic control on the rear wheel side is started. After that, the valve device V is operated based on the above-described difference in the pressure receiving area,
In addition, the opening and closing of the preload spring 90 is repeated in association with the urging force of the preload spring 90.

FIG. 3 is an enlarged half sectional view of the poppet valve body 300 shown in FIGS. Poppet valve 3
00 is a metal shaft portion 310 extending in the axial direction and a resin valve portion 32 located at one end thereof as described above.
0. The valve section 320 includes a seat section 322 that is attached to and detached from the valve seat 56. The seat portion 322 has a slightly rounded tapered shape extending from the metal shaft portion 310 side to the rear end 329 side of the valve portion 320 toward the outer peripheral direction. The shaft portion 310 is made of metal in order to increase its rigidity, while the valve portion 320 is made of resin in order to increase the sealing property between the valve portion 56 and the valve portion 320. Poppet valve body 300 here
Is manufactured by molding the valve section 320 on the metal shaft section 310. Looking more closely, the metal shaft 310
Is a small-diameter portion 316 and a large-diameter portion 3 that are continuous through a step.
17 and the valve part 320 is integrated with the outer periphery of the small diameter part 316.

The valve portion 320 is integrated with the seat portion 322, and further includes a resin-made extension shaft portion 323 extending from the seat portion 322 toward the other end (the end of the large-diameter portion 317) 311 of the metal shaft portion 310. Prepare. The extension shaft portion 323 is, of course, formed of a resin material. Extension shaft part 323 made of resin
Is flush with the outer peripheral surface 317e of the large diameter portion 317 of the metal shaft portion 310. By making the surfaces flush, guidance by the guide holes 57 can be received more effectively. The length of the extension shaft portion 323 in the axial direction is set in consideration of the size of the gap 52 between the metal shaft portion 310 and the guide hole 57. Here, the length is set to the length of the valve device V. It is set slightly larger than the lift amount. For example, while the lift amount of the valve device V is about 1.0 to 1.2 mm, the length of the extension shaft portion 323 along the axial direction is about 1.3 mm. Therefore, as shown in the partial enlarged view of FIG. 2, the joint boundary B between the extension shaft portion 323 and the metal shaft portion 310 is located in the guide hole 57 when the valve device V is opened.
Thus, even when the poppet valve body 300 is inclined, the valve portion 32 which is a resin material
0 can be reliably seated. In addition, even when the valve is opened, the joint boundary B between the extension shaft 323 and the metal shaft 310 is located in the guide hole 57, so that a step occurs at the joint boundary due to a manufacturing error during molding. Even if such a step does not occur, the step will not catch on the valve seat 56 and the seat cannot be seated on the valve seat 56. The valve section 320
Also functions as a spring receiver 324 for the valve spring 54 biasing itself to the valve closing position. A communication groove 325 for securing liquid communication is provided at an outer end of the spring receiver 324.

The tip of the small diameter portion 316 (one end of the metal shaft portion 310) 319 is tapered so that the diameter decreases as it goes further. And the valve part 32 with respect to the metal shaft part 310.
A gate portion for molding the O is provided further beyond the tip 319, that is, opposed to the tapered portion. The aim is that the resin material during molding flows smoothly into the mold along the taper, and the valve portion 320
An object of the present invention is to prevent the occurrence of flow marks on the surface. In FIG. 3, a fragment 328 of the resin material after the gate portion is provided remains at the rear end 329 of the valve portion 320. However, the fragment 328 is, of course, cut off after the valve body is formed. .

FIG. 4 is a view showing another embodiment, particularly for a metal shaft portion. The metal shaft portion 3310 has unevenness 3316a on the outer periphery of the small diameter portion 3316. The concavo-convex 3316a extending over one circumference increases the contact area with the resin to be molded, increases the strength in the axial direction, and enhances the adhesiveness to the resin portion and the mounting strength. Accordingly, even if the valve portion 3320 swells (a phenomenon in which the resin swells by absorbing moisture in the working fluid), the metal shaft portion 331 may be swelled.
Separation from zero can be prevented. Also, the metal shaft 33
Like the one end 3319, the other end 3311 of the ten may have a tapered shape such that the diameter decreases as approaching the end. By this taper, the metal shaft portion 310 is easily inserted into the mold when molding the valve portion 320,
It can be easily arranged in the mold.
Further, a large diameter portion 3317 of the metal shaft portion 3310,
The portion other than the tapered portion of the tip 3311 has a straight shape with the same diameter. By doing so, it is possible to further reduce the wraparound of the resin material during molding.

[0022]

According to the present invention, the shaft portion of the poppet valve body is formed of metal to increase its rigidity, and the valve portion is formed of resin to improve the sealing performance. On the other hand, by further providing the resin extension shaft portion, even when the poppet valve body is inclined, the valve portion (resin material portion) is securely attached to and detached from the valve seat. Therefore,
Insufficient sealing between the poppet valve element and the valve seat can be reliably prevented, and more reliable hydraulic pressure control can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hydraulic control valve 10 including a poppet valve body 300 according to an embodiment of the present invention.

FIG. 2 is an enlarged partial view showing the vicinity of a poppet valve body 300;

FIG. 3 is an enlarged half sectional view of the poppet valve body 300 shown in FIG.

FIG. 4 is a view showing another example of the metal shaft portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hydraulic pressure control valve 16 Stepped piston 17 Cylinder hole 19 Housing 20 Inlet room 30 Outlet room 60 Communication passage V Valve device 52 Gap 56 Valve seat 57 Guide hole 61 Valve seat forming member 300 Poppet valve body 310, 3310 Metal shaft Part 316, 3316 Small diameter part 316a, 3316a Unevenness 317, 3317 Large diameter part 320 Valve part 322 Seat part 323 Resin extended shaft part

Claims (7)

(57) [Claims] 1. A hydraulic pressure control valve, wherein the hydraulic pressure control valve is disposed in a valve chamber defined in the middle of a communication passage communicating between an inlet side and an outlet side, and formed on an outlet side of the valve chamber in accordance with the movement of the piston. A poppet valve body that opens and closes the communication path by being seated on and separated from a valve seat that extends through the valve seat through a guide hole formed on an outlet side of the valve seat. A shaft portion guided in the direction of movement, a valve portion formed on a side of the shaft portion opposite to a side inserted into the guide hole and projecting radially outward, and the valve seat formed on the valve portion. A poppet for a hydraulic pressure control valve, wherein the shaft portion is made of metal, the valve portion including the seat portion is made of synthetic resin, and the shaft portion and the valve portion are integrally formed. A valve body formed integrally with the valve portion and in front of the metal shaft portion from the seat portion; Serial guide further comprises an extension shaft portion made extending synthetic resin towards the hole side, the poppet valve body and before
Liquid communication between the inlet and outlet sides between the guide holes
There is a gap for the shaft center of the synthetic resin extension shaft.
The length in the direction is set in consideration of the size of this gap
And the poppet valve body is completely collapsed due to the gap.
Even if the valve seats, only the valve part is seated on and off the valve seat.
The poppet valve body of the hydraulic pressure control valve, wherein the length of the extension shaft portion is set as described above . Binding boundary portion between wherein said extension shaft portion and a metal shank, when the valve is opened to the poppet valve body away from said valve seat, located in the guide bore, fluid pressure control of claim 1 Poppet valve body of the valve. Wherein the metal shaft portion includes a small diameter portion and a large diameter portion which continuously via a step, the valve portion are integrated on the outer periphery of the small diameter portion, the liquid of claim 1 or 2 Poppet valve body for pressure control valve. 4. An outer peripheral surface of the synthetic resin extension shaft portion,
The poppet valve element of the hydraulic pressure control valve according to claim 3 , wherein the poppet valve element is flush with an outer peripheral surface of the large diameter portion. 5. The valve seat according to claim 1, wherein the guide hole and the valve seat are formed by a metal valve seat forming member, and the valve seat forming member is connected to an end of the stepped piston by caulking means. Poppet valve bodies of hydraulic pressure control valves of 1 to 4 . 6. The hydraulic pressure control valve according to claim 3 , wherein a tip of said small diameter portion is tapered, and a gate portion for molding said resin material is provided to face said tapered portion. Poppet valve body. 7. The poppet valve body for a hydraulic pressure control valve according to claim 3 , wherein irregularities are provided on an outer periphery of said small diameter portion.