JPH07174248A - Mushroom type valve - Google Patents

Abstract

PURPOSE:To enhance a sealing propertty by bringing the tip circumferential edge of a lip ino sufficient contact with the inner wall of a cylinder with conven tional molding accuracy even if a valve is slidhtly inclined inside the cylinder. CONSTITUTION:In a mushroom ttype valve 1 provided with a mushroom-like lip 3 housed inside a cylinder 10, thrrough which oil passes, enlarged from one side to the other side, and having a tip circumferential edge 20 to be brought into elastic contact with the inner wall of the cylinder 10, the tip circumferential edge 20 of the lip 3 is formed into a projected curve surfac, which is projected furtther outward of the outside surface of the lip 3. When oil flows from the other side toward one side, the lip 3 is enlarged by a pressure of the oil and is brought into elastic contact with the inner wall of the cylinder 10 for sealing, thus restraining flow-in of the oil. In this case, even if the mushroom type valve 1 is slightly inclined inside the cylinder 10, another surface of the tip circumferential edge 20 is broughtt into contact with the cylinder 10 so that the tip circumferential edge 20 is broughtt into sufficieent contact with the cylinder 10, thereby preventing a sealing property deteriorated state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap type valve provided with a cap-shaped lip provided in a cylinder through which oil such as lubricating oil flows.

[0002]

2. Description of the Related Art Conventionally, for example, as shown in FIGS. 8 and 9, there is a cap valve 1 used as a metering valve T for discharging lubricating oil. This cap-shaped valve 1 is integrally formed of rubber, and is provided in a cylinder 10 of a metering valve through which oil flows, and a tip end peripheral edge 2 formed from one side to the other side and formed in an angular shape is the cylinder 10's. It has a cap-shaped lip 3 that elastically contacts the inner wall. A guide rod 4 coaxial with the lip 3 is provided on one end surface portion of the lip 3, and the end surface portion around the base end portion of the guide rod 4 forms an outer sealing surface 5. A columnar body 6 coaxial with the lip 3 is provided inside the lip 3.
The other end surface of the inner side of the inner side forms an inner seal surface 7.

In the metering valve T, when oil is supplied from the supply port 11 of the cylinder 10, the cap valve 1 moves to the other side by the pressure of the supplied oil and communicates with the discharge port 12. Inlet 13a of pipe 13
Is closed by the inner sealing surface 7, and the lip 3 is reduced in diameter to allow oil to pass therethrough. The oil that has passed is slidably fitted to the outside of the pipe 13 and
Of the supply side cylinder chamber 17 formed by this pressing, against the biasing force of the spring 15, a piston 16 including a 0 ring 14 slidingly contacting the inner wall of the Will be filled. Further, due to the pressing of the piston 16, the oil filled in the discharge side cylinder chamber 18 is pushed out from the through hole 19 on the discharge port 12 side of the pipe 13 and discharged from the discharge port 12. Then, when the end of the piston 16 on the discharge port 12 side comes into contact with the fixed end of the pipe 13 and stops, the discharge ends,
As a result, the oil corresponding to the stroke of the piston 16 is discharged.

When the supply of oil from the supply port 11 is stopped and the hydraulic pressure is lost, the piston 16 is pressed toward the supply port 11 side by the urging force of the spring 15 and the pipe 1
3 is abutted on a stopper 13b provided on the supply port 11 side.
The pressure of the piston 16 causes a pressure to act on the oil filled in the supply side cylinder chamber 17, whereby the cap valve 1 moves to the supply port 11 side, and the step portion on the supply port 11 side moves to the outer sealing surface. 5, the lip 3 is expanded, and the tip peripheral edge 2 formed into an angular shape is elastically contacted with the inner wall of the cylinder 10 to seal and prevent the oil from flowing into the supply port 11 side.
Then, the oil filled in the supply side cylinder chamber 17 flows in from the inlet 13a of the pipe 13, and the displacement of the discharge side cylinder chamber 18 becomes negative pressure due to the movement of the piston 16, so that the through hole of the pipe 13 on the side of the discharge port 12 is formed. Oil flows into the discharge side cylinder chamber 18 from 19 and is stored as oil for the next discharge. By repeating such an operation, a fixed amount of lubricating oil is discharged from the discharge port 12.

[0005]

In the conventional cap type valve 1 described above, when the oil supply is stopped,
When the oil flows from the supply side cylinder chamber 17 into the discharge side cylinder chamber 18, the lip 3 is expanded and sealed, but when moving in the cylinder 10 by hydraulic pressure, it may tilt. In addition, the contact between the tip peripheral edge 2 of the lip 3 and the inner wall of the cylinder 10 becomes insufficient, and the shape of the tip peripheral edge 2 of the lip 3 cannot always be precisely maintained at the time of molding. There was a problem that oil leakage would occur without it. Therefore, this is a cause of impairing the accuracy of the discharge amount. Especially, in the case of a metering valve for lubrication, one shot may be a minute amount of 1 cc or less. The impact is great, and improvement in this respect is strongly desired.

The present invention has been made in view of the above problems, and its problem is the existing molding precision, and
Even if there is some inclination in the cylinder, the cap-shaped valve 1 is provided in which the lip peripheral edge is sufficiently brought into contact with the inner wall of the cylinder to improve the sealing performance.

[0007]

The technical means of the present invention for solving the above-mentioned problems is provided in a cylinder through which oil flows and expands from one side to the other side, and the tip peripheral edge is the inner wall of the cylinder. In a cap-shaped valve having a cap-shaped lip that elastically contacts with, a tip peripheral edge of the lip is formed into a convex curved surface.

Further, it is effective that the convex curved surface projects outward from the outer surface of the lip.

[0009]

According to the cap type valve having the above structure, when oil flows from one side to the other side in the cylinder,
The lip shrinks inward to allow the oil to pass. Further, when the oil tries to flow from the other side to the one side, the lip expands due to the pressure of the oil, and the tip peripheral edge makes elastic contact with the inner wall of the cylinder to seal the oil, thereby suppressing the inflow of the oil. In this case, even if the cap valve is slightly tilted in the cylinder, the peripheral edge of the lip tip is formed into a convex curved surface.
Even if the tip is inclined, another surface of the tip peripheral edge comes into contact with the cylinder, and therefore, the situation where the tip peripheral edge is sufficiently in contact with the cylinder and the sealing performance is impaired is prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A cap valve according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The same components as those described above will be designated by the same reference numerals.

As shown in FIGS. 1, 3 and 4, the cap valve 1 according to the embodiment is used for a metering valve T similar to that described above. This cap-shaped valve 1 is integrally formed of rubber and has a fixed quantity valve T through which oil flows.
A cylinder-shaped lip 3 which is provided in the cylinder 10 and which spreads from one side to the other side and whose tip peripheral edge 20 elastically contacts the inner wall of the cylinder 10. A guide rod 4 coaxial with the lip 3 is provided on one end surface portion of the lip 3, and the end surface portion around the base end portion of the guide rod 4 forms an outer sealing surface 5. A columnar body 6 coaxial with the lip 3 is provided inside the lip 3, and the other end surface of the columnar body 6 forms an inner sealing surface 7.

The tip peripheral edge 20 of the lip 3 is formed into a convex curved surface. In the embodiment, the convex curved surface is formed as an arc surface. That is, the tip peripheral edge 20 of the lip 3 is formed in a shape in which the circular end portion of the wall portion of the lip 3 is integrally formed. Furthermore, the convex curved surface is formed so as to project outward from the outer surface of the lip 3. This shade type valve 1
Has a total length of L = 8.5 mm and a tip diameter of the lip 3 of D = 5.5 mm.

When manufacturing the shade type valve 1 according to this embodiment, for example, as shown in FIG. 2, an upper mold 21 and a lower mold 22 which are separated from each other at the upper and lower sides are provided, and the upper mold 21 is provided with the apex of the convex curved surface. Molding is performed by a separate mold that is separated into a middle mold 23 and an outer mold 24 that are separated at the boundary. In this case, since the part 20a protruding outward from the outer surface of the convex curved surface is molded by the outer mold 24, the separation line of the mold does not enter, and therefore, the sealing property at the time of elastic contact with the cylinder 10 is improved. Reserved.

Next, the operation when the cap-type valve 1 according to the embodiment is used for the above-mentioned metering valve T will be described with reference to FIG.
As shown in (a) and (b), in the metering valve T,
When oil is supplied from the supply port 11 of the cylinder 10,
The cap valve 1 moves to the other side by the pressure of the supplied oil, and the inlet 13 of the pipe 13 communicating with the discharge port 12
A is closed by the inner sealing surface 7, and the lip 3 is reduced in diameter to allow oil to pass therethrough. The oil that passes through is
The cylinder 1 is slidably fitted to the outside of the pipe 13.
Consistent supply port 11 including 0 ring 14 that slides against the inner wall of 0
The piston 16 biased by the spring 15 to the side is pressed against the biasing force of the spring 15, and the supply side cylinder chamber 17 formed by this pressing is filled. Further, due to the pressing of the piston 16, the oil filled in the discharge side cylinder chamber 18 is pushed out from the through hole 19 on the discharge port 12 side of the pipe 13 and discharged from the discharge port 12. Then, when the end of the piston 16 on the discharge port 12 side comes into contact with the fixed end of the pipe 13 and stops, the discharge ends,
As a result, the oil corresponding to the stroke of the piston 16 is discharged.

Then, as shown in FIG. 4C, when the oil supply from the supply port 11 is stopped and the hydraulic pressure is lost,
As shown in FIG. 4D, the piston 16 is pressed toward the supply port 11 by the urging force of the spring 15, and the pipe 13
It comes into contact with a stopper 13b provided on the side of the supply port 11. The pressure applied to the oil filled in the supply side cylinder chamber 17 by the pressing of the piston 16 moves the shade valve 1 to the supply port 11 side, and the step portion 1 on the supply port 11 side.
1a is closed by the outer sealing surface 5, and further, the lip 3 is expanded and the tip peripheral edge 20 is elastically contacted with the inner wall of the cylinder 10 to seal and prevent the oil from flowing into the supply port 11 side. Then, the oil filled in the supply side cylinder chamber 17 flows in from the inlet 13a of the pipe 13, and the displacement of the discharge side cylinder chamber 18 becomes negative pressure due to the movement of the piston 16, so that the through hole of the pipe 13 on the side of the discharge port 12 is formed. Oil flows into the discharge side cylinder chamber 18 from 19 and is stored as oil for the next discharge. By repeating such an operation, a fixed amount of lubricating oil is discharged from the discharge port 12.

In this case, as shown in FIG. 5, when the cap-shaped valve 1 is slightly inclined in the cylinder 10, the sealing performance between the outer sealing surface 5 and the stepped portion 11a deteriorates, but the cap-shaped valve 1 Since the tip peripheral edge 20 of the lip 3 is formed into a convex curved surface, another surface of the tip peripheral edge 20 is brought into contact with the lip 3 even if it is inclined, and therefore the tip peripheral edge 20 is sufficiently contacted, so that the sealing performance is deteriorated. Is prevented. Therefore, the leakage of oil to the supply port 11 side is suppressed, so that the oil can be reliably stored in the discharge side cylinder chamber 18, and that much
The accuracy of the discharge amount can be improved. Especially one shot
For a very small amount of 1 cc or less, the accuracy is greatly improved.

FIG. 6 shows another example of the tip peripheral edge 30 of the lip 3 of the shade valve 1. In this, a semicircular shape is integrally formed on the outer side of the tip of the lip 3. Further, FIG. 7 shows another example of the tip peripheral edge 31. This has a shape in which the outside of the tip is chamfered into a convex curved surface. However, when the chamfered surface is simply formed into a convex curved surface, the side surface of the lip 3 is likely to contact the inner wall of the cylinder 10 when tilted, so that the convex curved surface should project more outward than the outer surface of the lip 3. Since the lower side of the convex curved surface of the lip 3 can come into contact with the inner wall of the cylinder 10, the sealing property is further improved.

In the above embodiment, the convex curved surface at the peripheral edge of the tip is a circular arc surface, but it is not limited to this and may be formed by another curved surface. Further, in the above embodiment,
The cap valve 1 is for a metering valve T, but is not necessarily limited to this. For example, a check valve of a metering valve of another type, a depressurizing valve of a pump, etc., in a cylinder of another device. The present invention may be applied to a cap-shaped valve provided in the.

[0019]

As described above, according to the cap-type valve of the present invention, since the tip peripheral edge of the lip is formed into a convex curved surface,
Even if the cap valve is slightly tilted in the cylinder, it is possible to bring another surface of the tip peripheral edge into contact, and therefore the tip peripheral edge can be brought into sufficient contact, so that the sealing performance can be improved.

Further, when the convex curved surface is projected to the outside of the outer surface of the lip, the lower side of the convex curved surface can be brought into contact with the inner wall of the cylinder when tilted, so that the sealing performance is further improved. Can be made.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a cap valve according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a cap valve according to an embodiment of the present invention together with an example of a mold for manufacturing the same.

FIG. 3 is a cross-sectional view showing an operation of a metering valve in which the cap type valve according to the embodiment of the present invention is used.

FIG. 4 is a cross-sectional view showing an operation of a metering valve in which the cap type valve according to the embodiment of the present invention is used.

FIG. 5 is a diagram showing an operation of the cap valve according to the embodiment of the present invention.

FIG. 6 is a half cross-sectional view showing another example of the tip peripheral edge of the shade type valve according to the embodiment of the present invention.

FIG. 7 is a half cross-sectional view showing another example of the tip peripheral edge of the shade type valve according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view showing the operation of a metering valve in which a conventional cap type valve is used.

FIG. 9 is a sectional view showing an example of a conventional cap-type valve.

[Explanation of symbols]

 T quantitative valve 1 cap valve 2 tip peripheral edge (conventional example) 3 lip 10 cylinder 20 tip peripheral edge 30 tip peripheral edge 31 tip peripheral edge

Claims (2)

[Claims] 1. A cap-shaped valve provided in a cylinder through which oil flows, which expands from one side to the other side and has a cap-shaped lip whose tip peripheral edge makes elastic contact with the inner wall of the cylinder. A cap-shaped valve characterized by being formed on a convex curved surface. 2. The cap-shaped valve according to claim 1, wherein the convex curved surface projects outward from the outer surface of the lip.