JPH09210219A - Valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve which eliminates apprehension for damaging a seal member. SOLUTION: This valve has an end wall internal surface 2b, which is a valve seat provided with a communication hole 9 of a fluid passage, and a valve unit comprising a supporter 12a and an annular seal member 15 fitted to the periphery of the supporter 12a into contact with the end wall internal surface 2b so as to interrupt the communication hole 9 by elastic deformation. Here, since roundness is provided in a peripheral end part 12aa of a surface opposed to the end wall internal surface 2b of the supporter 12a, in tumbling with the peripheral end part 12aa of the supporter 12a in the seal member 15 serving as the support point, apprehension for damaging the seal member 15 is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve having an annular seal member, and more particularly to a valve used in a master cylinder or the like used in a hydraulic brake system for automobiles.

[0002]

2. Description of the Related Art A conventional valve is the actual open valve 62-2096.
As disclosed in Japanese Unexamined Patent Publication No. 2 (1994), a valve seat having a communication hole which is a fluid passage, and a support body and an outer periphery of the support body, which are elastically deformed by coming into contact with the valve seat, the communication hole. A valve body having an annular seal member for closing the valve, the surface of the support body facing the valve seat is a flat surface, and the outer peripheral end of the surface of the support body facing the valve seat. The part is said to be sharp.

In this conventional valve, the valve body is brought into contact with the valve seat, the seal member is elastically deformed in the axial direction of the seal member, and the communication hole is shielded. The communication hole can be communicated by separating from the valve seat.

[0004]

However, in the recent hydraulic brake systems for automobiles, there is a tendency that complicated hydraulic devices such as ABS (anti-brake lock system) and TRC (traction control system) are added. When a conventional valve described above is used in a hydraulic brake system for an automobile to which a device such as ABS is added, when the valve body comes into contact with the valve seat to block the communication hole, the device such as ABS is There is a case where the fluid pressure on the valve body side becomes higher than the fluid pressure on the communication hole side due to the activation of the device such as the ABS. When the fluid pressure on the valve body side becomes higher than the fluid pressure on the communication hole side, the high pressure biases the seal member of the valve body inward in the radial direction of the seal member. When the valve body separates from the valve seat in a state where the fluid pressure on the valve body side is high, the pressure applied to the seal member inward in the radial direction of the seal member causes the valve body side to move further. The fluid flows toward the communication hole, and the flow of the fluid into the communication hole causes the seal member to be pressed and urged inward in the radial direction of the seal member to face the valve seat of the support body. The seal member falls inward in the radial direction of the seal member with the sharp outer peripheral end of the fulcrum as a fulcrum, and the portion of the inner peripheral side of the seal member that contacts the sharp outer peripheral end of the surface facing the valve seat is damaged. There is a fear of doing.

Further, when the valve body comes into contact with the valve seat in a state where the fluid pressure on the valve body side is high and the seal member falls down, the seal member causes the flat surface of the support body to face the valve seat and the valve seat. By being sandwiched, the seal member receives a pressing force by the fluid in the valve seat direction acting on the valve body via the support body,
There is a risk that the seal member may be crushed and damaged. An object of the present invention is to provide a valve in which there is no risk of damage to the seal member.

[0006]

In order to solve the above technical problems, a valve seat having a communication hole which is a fluid passage, a support body and an outer periphery of the support body are fitted to contact the valve seat. A valve having an annular seal member that elastically deforms to close the communication hole, and the outer peripheral end of the surface of the support facing the valve seat is rounded. The characteristic valve was constructed.

[0007] Preferably, when the valve body comes into contact with the valve seat in a state where the seal member is tilted inward in the radial direction of the seal member, the support body can contact the valve seat, The contact portion between the surface of the support member facing the valve seat and the valve seat is the valve and the valve when the annular seal member collapses to the maximum inward in the radial direction of the seal member. A valve characterized by being inward in the radial direction of the seal member rather than a contact portion with a seat is desirable.

Preferably, the valve is characterized in that the surface of the support member facing the valve seat has a substantially hemispherical shape.

In the valve according to the first aspect, the valve element comes into contact with the valve seat to elastically deform the seal member to shield the communication hole. or,
The valve body is disengaged from the valve seat to allow the communication hole to communicate.

Further, when the seal member of the valve body comes into contact with the valve seat to block the communication hole, the fluid pressure on the valve body side becomes higher than the fluid pressure on the communication hole side, and this high pressure causes The seal member of the valve body is biased inward in the radial direction of the seal member, and when the valve body separates from the valve seat in this high pressure state, the seal member acting on the seal member is actuated. Due to the pressure biased inward in the radial direction of the seal member, and further, the flow of fluid on the valve body side into the communication hole,
The seal member is pressed and urged inward in the radial direction of the seal member, and falls inward in the radial direction of the seal member with the rounded outer peripheral end of the surface of the support member facing the valve seat as a fulcrum.

According to the valve of claim 2, in addition to the operation of claim 1, the fluid pressure on the valve body side is high and the valve body abuts the valve seat in a state where the seal member is collapsed inward to form the communication hole. When shielded, the surface of the support body facing the valve seat contacts the valve seat, and the sealing member also contacts the valve seat. Further, the contact portion between the valve seat and the surface of the support member facing the valve seat has a contact area between the seal member and the valve seat when the seal member is inwardly collapsed to the maximum. It is inward in the radial direction.

According to the valve of claim 3, in addition to the function of claim 2, the fluid pressure on the valve body side is high and the seal member abuts against the valve seat in a state where the seal member is inwardly collapsed to form the communication hole. When shielded, the central portion of the substantially hemispherical surface of the support, which faces the valve seat, contacts the valve seat, and the seal member also contacts the valve seat. Further, the contact portion between the valve seat and the surface of the support body having a substantially hemispherical shape facing the valve seat is the contact portion between the seal member and the valve seat when the seal member is inwardly collapsed to the maximum. Is more inward in the radial direction of the seal member.

[0013]

Embodiments of the present invention will be specifically described below.

As shown in FIG. 1, reference numeral 1 is a brake master cylinder used in an automobile brake system to which an ABS device is added. Inside a cylinder body 2, pistons having ring-shaped cup seals 4 and 5 mounted on the outer circumference are provided. 3 is slidably and liquid-tightly fitted.
A pressure chamber 6 is formed between the end wall 2 a of the cylinder body 2 and the end wall 2 a of the cylinder body 2. The pressure chamber 6 communicates with an actuator forming an ABS device (not shown) formed in the cylinder body 2 and a discharge port 7 communicating with a wheel cylinder. In the pressure chamber 6, a return spring 8 of the piston 3 and a communication hole formed in the end wall 2a of the cylinder body 2 in accordance with the operation (left sliding in FIG. 1) and return of the piston 3 are formed. A valve 10 for blocking and communicating with a reservoir (not shown) via 9 is arranged.

FIG. 2 is an enlarged view of the vicinity of the valve 10 portion of FIG. 1, and FIG. 3 is an enlarged view of the vicinity of the seal member 15 portion of FIG. As shown in FIGS. 2 and 3, the valve 10 includes an inner surface 2b serving as a valve seat of the end wall 2a of the cylinder body 2, a valve body 11, and a return spring 8 which fits the end wall 2a of the cylinder body 2. A case 13 which is pressed against the inner surface 2b and slidably supports the rod 12 and thus the valve body 11, and a case 13 which is disposed in the case 13 and which uses the rod 12 and thus the valve body 11 as a valve seat (left in FIG. 2). And a spring 14 for urging the same.

The valve body 11 is composed of a rod 12 and an annular seal member 15 made of rubber which is fitted to the rod 12 and elastically deforms by contacting the inner surface 2b to shield the communication hole 9. The rod 12 includes a support 12a and an engaging portion 12
b, the main body portion 12c, and the enlarged portion 12d are integrally provided, and the seal member 15 has an inner flange portion 15a.
It is assembled to the rod 12 by being fitted to the outer periphery of the rod 2a and the inner flange portion 15a being elastically engaged with the engaging portion 12b. An outer peripheral end 12aa of a surface of the end wall 2a of the support 12a of the rod 12 facing the inner surface 2b is rounded, and a surface facing the inner surface 2b has a substantially hemispherical shape.

The rod 12 has an enlarged portion 1 at the right end in FIG.
2d, the enlarged portion 12d is slidably inserted into the axial hole 3a of the piston 3, and the piston 3
The retainer 16 is fixed to the shaft to prevent the retainer 16 from coming off the axial hole 3a.

Next, the operation will be described. 4 is an enlarged view of the vicinity of the seal member 15 portion of the valve 10 in the open state when the pressure chamber 6 is in a high pressure state, and FIG. 5 is a seal member 15 in the closed state of the valve 10 when the pressure chamber 6 is in a high pressure state. It is an enlarged view of a part vicinity. As shown in FIGS. 1 to 5, the push rod 15
When the master cylinder 1 in which the piston 3 is pushed to the left in FIG. 1 by the action of the master cylinder 1 is operated, as is well known, the rod 12 and the valve body 11 are moved by the spring 14 in conjunction with the action of the piston 3.
1, the seal member 15 of the valve body 11 comes into contact with the inner surface 2b of the end wall 2a of the cylinder body 2, and the seal member 15 is elastically deformed in the axial direction to communicate with each other. The hole 9 and the pressure chamber 6 are liquid-tightly shut off from each other. Thereafter, the piston 3 is further operated to pressurize the liquid in the pressure chamber 6 and discharge the liquid from the discharge port 7.
When the push rod 15 depresses the piston 3, the return spring 8 slides the piston 3 to the right in FIG. At this time, if the pressure in the pressure chamber 6 becomes negative, the seal member 11 separates from the inner surface 2b of the end wall due to the pressure difference between the communication hole 9 and the pressure chamber 6, and the liquid in the reservoir (not shown) enters the pressure chamber 6. Be pumped in. Then, when the piston 3 returns to the return position of FIG. 1, the rod 12 is forced to the position of FIG. 1 by the engagement of the expanded portion 12d of the rod 12 and the retainer 16, and the seal member 15 separates from the inner surface 2b of the end wall. The pressure chamber 6 is maintained in the state and communicates with the reservoir.

During operation of the master cylinder 1, that is, the valve body 1
The seal member 15 of No. 1 comes into contact with the inner surface 2b of the end wall and the communication hole 9
When the ABS device (not shown) is actuated when the pressure chamber 6 and the pressure chamber 6 are shut off, the brake fluid pressure on the valve body 11 side, that is, the brake fluid pressure in the pressure chamber 6 is the brake fluid on the communication hole 9 side. The hydraulic pressure is higher than the hydraulic pressure of the reservoir. When the brake fluid pressure in the pressure chamber 6 becomes higher than the brake fluid pressure on the communication hole 9 side, the high pressure biases the seal member 15 of the valve body 11 inward in the radial direction of the seal member 15. become. When the pressure of the piston 3 is forcibly released by the push rod 15 when the pressure chamber 6 is in a high pressure state, the piston 3 is slid to the right in FIG. 1 by the return spring 8 and the piston 3 returns to the state shown in FIG. After returning to the position, the enlarged portion 12d of the rod 12 and the retainer 16 are locked to force the rod 12 to the position shown in FIG. 1 so that the seal member 15 is disengaged from the inner surface 2b of the end wall, and the pressure chamber 6 becomes the reservoir. The brake fluid in the pressure chamber 6 tries to flow into the reservoir through the communication hole 9 by communicating with the reservoir. The pressure applied to the seal member 15 inward in the radial direction of the seal member 15, and further, the flow of the brake fluid in the pressure chamber 6 to the communication hole 9 causes the seal member 15 to move. Inward in the radial direction of the seal member 15 with the outer peripheral end 12aa having a rounded surface opposed to the inner wall 2b of the end wall of the support 12a as a fulcrum as a fulcrum. I will fall to one side. However, since the outer peripheral end 12aa of the support 12a of the rod 12 is rounded, the seal member 15 and the support 1
The seal member 1 is brought into contact with the outer peripheral end 12aa of the 2a.
There is no possibility that 5 will be damaged.

When the piston 3 is further pushed to the left by the push rod 15 from the state in which the seal member 15 has fallen down, as shown in FIG.
The seal member 15 of the valve body 11 abuts the inner surface 2b of the end wall in a state in which the valve body 11 is collapsed inward, so that the communication hole 9 and the pressure chamber 6 are shut off from each other. However, the central portion of the substantially hemispherical surface facing the end wall inner surface 2b of the support 12a abuts the end wall inner surface 2b, and the sealing member 15 also has an end wall inner surface 2b.
b and the contact portion between the end wall inner surface 2b of the support 12a and the end wall inner surface 2b of the support body 12a, the seal member 15 and the end wall when the seal member 15 is inwardly collapsed to the maximum. Since the seal member 15 is located inward of the contact surface with the inner surface 2b in the radial direction, the pressing force of the brake fluid and the spring 14 on the inner surface 2b of the end wall, which acts on the valve element 11, is applied to the support body 12a. Distributing into a contact portion between the surface facing the inner wall 2b of the end wall and the inner surface 2b of the end wall, and a contact portion between the seal member 15 and the inner surface 2b of the end wall when the seal member 15 is maximally collapsed inward. Therefore, the force of compressing the seal member 15 by being sandwiched between the support 12a and the inner surface 2b of the end wall is reduced, and there is no fear that the seal member 15 is crushed and damaged.

As described above, according to the valve 10 of the present embodiment, since the outer peripheral end 12aa of the support 12a of the rod 12 is rounded, the seal member 15 is formed.
The seal member 15 is not likely to be damaged when the support 12a falls down with the outer peripheral end 12aa as a fulcrum, and the surface facing the inner wall 2b of the end wall of the support 12a has a substantially hemispherical shape. Even if the valve body 11 comes into contact with the inner surface 2b of the end wall when the member 15 falls down, the support body 12
The central portion of the substantially hemispherical surface facing the end wall inner surface 2b of a can contact the end wall inner surface 2b, and the contact between the surface facing the end wall inner surface 2b of the support 12a and the end wall inner surface 2b. Since the contact portion is more inward in the radial direction of the seal member 15 than the contact portion between the seal member 15 and the inner surface 2b of the end wall when the seal member 15 collapses inwardly at the maximum,
There is no fear that the seal member 15 is sandwiched between the support 12a and the inner surface 2b of the end wall and is torn off, and thus it is possible to provide a valve in which there is no risk of damage to the seal member 15. In the present embodiment,
Although the valve of the present invention is adopted in the single type brake master cylinder, the present invention is not limited to this.
It is needless to say that even if the valve of the present invention is adopted in various valve mechanisms such as a tandem type portless brake master cylinder, similar effects can be obtained.

Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment but includes various embodiments according to the principle of the present invention.

[0023]

As described above, according to the invention of claim 1, since the outer peripheral end of the surface of the support member facing the valve seat is rounded, the valve seat of the support member of the seal member is rounded. To provide a valve in which there is no risk of damaging the seal member when the seal member falls inward in the radial direction with the outer peripheral edge of the surface facing the seal as a fulcrum, and therefore there is no risk of damage to the seal member. Is possible.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the surface of the support member facing the valve seat abuts on the valve seat, and the seal member also abuts on the valve seat. Further, the contact portion between the valve seat and the surface of the support member facing the valve seat has a contact area between the seal member and the valve seat when the seal member is inwardly collapsed to the maximum. Since it is inward in the radial direction, the pressing force of the fluid acting on the valve body against the valve seat causes the surface of the support body facing the valve seat, the contact portion between the valve seat and the seal member to be directed inward. Is distributed to the contact area between the seal member and the valve seat when it is fully collapsed, and the force of compressing the seal member by being sandwiched between the support and the valve seat is reduced, and the seal member is crushed and damaged. There is no fear of doing this. Therefore, it is possible to provide a valve in which there is no risk of damage to the seal member.

According to the invention of claim 3, in addition to the effect of the invention of claim 2, the central portion of the substantially hemispherical surface of the support member facing the valve seat abuts on the valve seat, and the seal is formed. The member also comes into contact with the valve seat, and further, the contact portion between the valve seat and the surface of the substantially hemispherical support member facing the valve seat is the seal member when the seal member is inwardly collapsed to the maximum. Since the seal member is located inward in the radial direction of the seal member than the contact portion between the valve seat and the valve seat, the pressing force of the fluid acting on the valve seat against the valve seat causes the valve seat to face the surface facing the valve seat. Is distributed to the contact portion between the seal member and the valve seat when the seal member is inwardly collapsed to the maximum, and the seal member is compressed by being sandwiched between the support body and the valve seat. Therefore, there is no fear that the seal member is crushed and damaged due to the reduction of the force. Therefore, it is possible to provide a valve in which there is no risk of damage to the seal member.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a master cylinder according to an embodiment.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a partially enlarged sectional view of FIG.

FIG. 4 is an enlarged view of the vicinity of the seal member 15 portion in the open state of the valve 10 when the pressure chamber 6 is in a high pressure state.

FIG. 5 is an enlarged view of the vicinity of a seal member 15 portion in a closed state of the valve 10 when the pressure chamber 6 is in a high pressure state.

[Explanation of symbols]

 2b End wall inner surface 9 Communication hole 10 Valve 11 Valve body 12a Support 12aa Outer peripheral end 15 Seal member

Claims (3)

[Claims] 1. A valve seat having a communication hole which is a fluid passage,
A valve having a support and an annular seal member that is fitted to the outer periphery of the support and elastically deforms by contacting the valve seat to close the communication hole. A valve having a rounded outer peripheral end on a surface facing the valve seat. 2. The support body is capable of contacting the valve seat when the valve body comes into contact with the valve seat in a state where the seal member is tilted inward in the radial direction of the seal member.
The contact portion between the surface of the support member facing the valve seat and the valve seat has the same seal member when the annular seal member collapses to the maximum inward in the radial direction of the seal member and the seal member. 2. The valve according to claim 1, wherein the seal member is located inward in the radial direction of the seal member as compared with the contact portion with the valve seat. 3. The valve according to claim 2, wherein a surface of the support member facing the valve seat has a substantially hemispherical shape.