JPH0742463U - Check valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a check valve which can stabilize the support of a movable valve element and can be produced at low cost. [Structure] A check valve for restricting the moving direction of a fluid. Stopper member 3 of movable valve element 33 of check valve
4 has a fitting portion 34a that fits into the through hole 32 of the valve housing 31 and a diameter smaller than the diameter of the through hole 32 of the valve housing 31 and extends from the fitting portion 34a toward one end of the through hole 32. And a movable valve element 33 that is supported by stopping the movable valve element 33 against the protruding end when the valve element is separated from the valve seat portion 35.
Has a seat portion 35 and a through hole 36 through which the fluid flows in the axial center portion. The seating portion 34b of the stopper member 34 has a communication hole 3 cut from the protruding end toward the fitting portion 34a.
7, the space S between the seat portion 34b and the through hole 32 of the valve housing 31 communicates with the flow hole 36 of the stopper member 34.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a check valve which is arranged in a fluid passage and regulates a flow direction of a fluid flowing through the fluid passage.

[0002]

[Prior art]

 This type of check valve is used for various purposes, for example, in a lubricating oil supply mechanism of an automobile engine, for preventing the lubricating oil in the cylinder head from flowing down to an oil pan when the engine is stopped.

In an automobile engine CE, for example, as shown in FIG. 3, a cylinder head 2 is fastened to an upper end portion of a cylinder block 1, a cylinder head cover 3 is attached to an upper end portion of the cylinder head 2, and a cylinder block 2 is mounted. An oil pan 4 is attached to the lower end portion of 1. A cylinder 5 is formed in the cylinder block 1, and a piston 6 is fitted in the cylinder 5. Here, the piston 6 is connected to a crank shaft 9 via a connecting rod 7, a crank pin 8 and a crank arm (not shown).

Lubricating oil is held in the oil pan 4, and this lubricating oil is supplied to each portion in the engine CE that requires the lubricating oil. Specifically, after the lubricating oil in the oil pan 4 is sucked into the oil pump 12 via the oil strainer 11, the lubricating oil in the cylinder block 1 is passed through the lubricating oil supply pipe 13 and the cylinder block side lubricating oil supply passage 14. The lubricating oil in the cylinder block side lubricating oil supply passage 14 is further supplied to each portion in the cylinder head 2 through the cylinder head side lubricating oil supply passage 15.

A check valve V is arranged at a connecting portion between the cylinder block side lubricating oil supply passage 14 and the cylinder head side lubricating oil supply passage 15. This check valve V allows the lubricating oil to flow from the cylinder block side lubricating oil supply passage 14 into the cylinder head side lubricating oil supply passage 15, while allowing the lubricating oil to flow from the cylinder head side lubricating oil supply passage 15 into the cylinder block side lubricating oil. The inflow of lubricating oil into the supply passage 14 is prohibited. Therefore, even when the engine is stopped, that is, when the oil pump is stopped, the lubricating oil is retained in the cylinder head side lubricating oil supply passage 15 (cylinder head 2), and the HLA and the like (not shown) do not run out of lubricating oil.

Conventionally, as the above check valve V, one having a structure as shown in FIGS. 4 and 5, for example, has been used. That is, the check valve V is composed of the valve housing 21 and the stopper member 22 of the check valve V, and the movable valve element 23 formed of a ball. The valve housing 21 has a lubricating oil inflow port 24 and a valve seat 25 on one end side thereof. The stopper member 22 is fitted into the through hole 26 of the valve housing 21 at the other end of the valve housing 21.

The stopper member 22 has a seat portion 27 on which the movable valve body 23 separated from the valve seat 25 is seated, and a lubricating oil passage 28 running along the axial center thereof and the lubricating oil passage 28 and the valve housing. It has three communicating holes 29 (see FIG. 5) communicating with the through holes 26 of 21.

In the above structure, when the engine CE shown in FIG. 3 is stopped and the upward flow of the lubricating oil is stopped, the movable valve body 23 is at the position (a) shown by the solid line in FIG. The valve seat 25 is closed by its own weight, whereby the downward flow of the lubricating oil is blocked, and the lubricating oil is retained in the lubricating oil supply passage 15 on the cylinder head 2 side of the engine CE shown in FIG.

On the other hand, during operation of the engine CE shown in FIG. 3, the lubricating oil flows upward in the lubricating oil supply passage 14 on the cylinder block 1 side, and the flow of this lubricating oil causes the check valve V of FIG. 4 and FIG. The movable valve body 23 is lifted, and the movable valve body 23 is supported (held) by the seating portion 27 at the position (b) indicated by the two-dot chain line in FIG. As a result, the valve seat 25 is opened, and the lubricating oil in the lubricating oil supply passage 14 on the cylinder block 1 side is sequentially supplied with the lubricating oil inlet 24, the through hole 26 and the communication holes, as indicated by the arrow in FIG. It flows into the lubricating oil supply passage 15 on the cylinder head 2 side through 29 and the lubricating oil passage 28.

[0010]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional check valve V, a part of the stopper member 22 is projected into the through hole 26 of the valve housing 21 in the shape of a truncated cone to form a seating portion 27, and three seating portions 27 are formed on the side surface of the seating portion 27. Since the communication hole 29 is formed, the contact diameter a (see FIG. 5) of the movable valve body 23 at the projecting end of the seat portion 27 cannot be increased so much. Therefore, there is a problem in that the support stability of the movable valve body 23 is deteriorated during the operation of the engine CE, and the movable valve body 23 tends to wobble. When the movable valve body 23 wobbles, turbulence (turbulent flow) occurs in the flow of the lubricating oil around it, and when the turbulence is large, this turbulence promotes wobbling of the movable valve body 23, and this wobble This causes a vicious circle in which turbulent flow is promoted, and finally the movable valve body 23 violently reciprocates between the valve seat 25 and the seat portion 27, and the impact at that time causes the valve seat 25 or the seat portion 27 to move. There is a problem that damage may occur to the.

Further, each of the communication holes 29 is usually formed by machining with a drill or electric discharge machining. However, in the case of machining, post-processing for removing “burrs”, “burrs”, etc. For example, since there is a need for filing, there is a problem that the man-hours for the work increase and the productivity deteriorates. On the other hand, in the case of electrical discharge machining, the machining speed is low, so it takes a long time to process (for example, about 3 times that in the case of machining), and there is a problem that productivity deteriorates, and the equipment cost is very high. There is a problem that it becomes extremely high (for example, 100 times that in machining).

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to stabilize the support of the movable valve body during fluid flow, and to produce at low cost and high productivity. It is an object of the present invention to provide a check valve that can be used.

[0013]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 is characterized in that a movable valve body is housed in a through hole inside a valve housing, and the fluid moves inside the through hole from one end side to the other end side. The movable valve element is biased by the fluid to move away from the valve seat portion arranged at one end side of the through hole to allow the fluid to pass through the valve housing while the through hole is moved. A check valve that prevents the movement of the fluid by urging the movable valve element toward the valve seat portion against the movement of the fluid moving from the other end side to the one end side inside the , A fitting portion that fits into the opening on the other end side of the through hole of the valve housing, and a diameter smaller than the diameter of the through hole of the valve housing, and the one end portion of the through hole from the fitting portion. The valve seat from the valve seat. The seating portion of the movable valve body that holds the movable valve body against each other at intervals and supports, and the stopper member of the movable valve body that has a flow hole through which the fluid flows in the axial center portion, the seating portion of the stopper member Is cut from the projecting end toward the fitting portion, and has a communication hole that connects the space between the seating portion and the through hole of the valve housing and the communication hole of the seating portion. And

In order to achieve the above object, a check valve according to a second aspect of the present invention is the check valve according to the first aspect, wherein the communication holes are arranged symmetrically with respect to the axial center of the stopper member. To do.

In order to achieve the above object, the check valve according to claim 3 is the check valve according to claim 1 or 2, wherein the cutting depth of the communication hole is between the seat portion and the through hole of the valve housing. It is characterized in that it gradually increases from the above-mentioned space between them toward the above-mentioned flow hole.

In order to achieve the above object, the check valve according to claim 4 is the check valve according to any one of claims 1 to 3, characterized in that the stopper member is formed by sintering. And

In order to achieve the above object, a check valve according to a fifth aspect is the check valve according to any one of the first to third aspects, wherein the stopper member is formed by cold forging. And

In order to achieve the above object, a check valve according to a sixth aspect of the present invention is the check valve according to any one of the first to third aspects, wherein all members are formed of plastic.

[0019]

[Function and effect of device]

 According to the first aspect of the present invention, the movable hole, which connects the through hole of the valve housing and the through hole of the seat portion, projects from the fitting portion of the stopper member toward one end of the through hole of the valve housing. It is formed by cutting the seating part of the valve body from its protruding end toward the fitting part, so the diameter of the seating part can be increased, and the fluid flows from one end to the inside of the through hole of the valve housing. When flowing toward the other end, the movable valve element is supported by the seating portion at a position relatively distant from the axis of the through hole, and the fluid flowing from the through hole of the valve housing into the flow hole of the stopper member moves. Since the flow direction is changed at the deepest part of the notch of the communication hole away from the seat portion of the valve body, turbulent flow that disturbs the fluid flow does not occur near the movable valve body. Therefore, the stability of support of the movable valve body in the seating portion is enhanced, and even if the flow velocity of the fluid flowing in the valve housing is increased, the movable valve body is not separated from the seating portion, and the inner surface of the through hole of the valve housing and the valve housing are not separated. It is possible to prevent the seat or the seating portion from being damaged.

According to the second aspect of the invention, since the communication hole is located axially symmetrical with respect to the axial center of the stopper member, the through hole of the valve housing is passed through the communication hole to the flow hole of the stopper member. The flowing fluid flows in an axially symmetrical manner with respect to the axial center of the stopper member, and the force acts evenly on each part of the movable valve element, causing the fluid to urge the movable valve element toward its seat. When flowing, the force acting on the movable valve body converges in the direction that directs the movable valve body toward the seat portion, and the movable valve body can be quickly and stably seated on the seat portion.

Further, according to the third aspect of the invention, the depth of cut of the communication hole gradually increases from the space between the seating portion and the through hole of the valve housing toward the communication hole. The direction of the fluid in the through hole gradually changes in the communication hole and flows into the flow hole of the stopper member, and the flow of fluid around the movable valve body is less likely to be disturbed, and the support stability of the movable valve body is reduced. Can be further enhanced.

Further, according to the invention of claim 4, since the stopper member is formed by sintering, “burr” or “burr” does not occur when the communication hole is formed in the seat portion. Therefore, post-processing is not required, and the productivity of the valve housing can be improved.

Further, according to the invention of claim 5, since the stopper member is formed by cold forging, “burr” or “burr” does not occur when the communication hole is formed in the seat portion. This eliminates the need for post-processing and improves the productivity of valve housings.

Further, according to the invention of claim 6, since all the members are made of plastic, the weight of the check valve can be reduced and the molding thereof can be facilitated.

[0025]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The construction of one embodiment of the check valve according to the present invention is shown in FIGS.

The check valve V ′ has a valve housing 31 having a substantially cylindrical shape, and a movable valve body 33 made of a ball housed in a through hole 32 penetrating from one end side to the other end side of the valve housing 31. , And the stopper member 34 of the movable valve body 33.

The valve housing 31 has the same structure as the valve housing 21 of the check valve V shown in FIGS. 4 and 5, and has a valve seat portion 35 of the movable valve body 33 at one end of the through hole 32. Have. The stopper member 34 is fixed to the other end of the through hole 32 of the valve housing 31.

The stopper member 34 has a fitting portion 34 a that fits into the opening on the other end side of the through hole 32 of the valve housing 31, and a seat portion 34 b of the movable valve body 33. The seating portion 34b of the movable valve body 33 has a diameter smaller than the diameter of the through hole 32 of the valve housing 31, and protrudes from the fitting portion 34a toward the one end of the through hole 32. The movable valve element 33 is stopped and supported by the protruding end when it is separated from the valve seat portion 35. The stopper member 34 has a fluid passage hole 36 in its axial center that penetrates the fitting portion 34a and the seat portion 34b.

The seating portion 34b of the stopper member 34 of the movable valve body 33 is cut from its projecting end toward the fitting portion 34a at a position symmetrical with respect to the axial center of the seating portion 34b. A communication hole 37 that connects the space S between the valve housing 31 and the through hole 32 of the valve housing 31 and the communication hole 36 in the stopper member 34 is provided. The cutting depth of each of the communication holes 37 gradually increases from the space S between the seat portion 34b and the through hole 32 of the valve housing 31 toward the flow hole 36. As a result, in each of the communication holes 37, the inner side surface 37a of the stopper member 34 on the fitting portion 34a side is an inclined surface that is inclined toward the flow hole 36 of the stopper member 34.

The operation of the check valve V ′ having the above-described structure is performed by, for example, the lubricating oil supply passage 14 on the cylinder block 1 side and the lubricating oil supply passage 15 on the cylinder head 2 side of the engine CE described in FIG. The case in which it is arranged at the connecting portion will be described below.

When the engine CE is stopped, the oil pump 12 is stopped and the lubricating oil is not supplied to the cylinder block 1 side and the lubricating oil supply passage 14. Therefore, since no upward force acts on the movable valve body 33 in addition to buoyancy, the movable valve body 33 is seated on the valve seat 35 by its own weight as shown by the solid line (c) in FIG. 35 is closed. Therefore, the downward flow of the lubricating oil in the lubricating oil supply passage 15 on the cylinder head 2 side is blocked by the check valve V ′, and the lubricating oil is retained in the lubricating oil supply passage 15 on the cylinder head 2 side.

On the other hand, during operation of the engine CE, the oil pump 12 is driven, and the lubricating oil discharged from the oil pump 12 is supplied to the lubricating oil supply passage 14 on the cylinder block 1 side via the lubricating oil supply pipe 13. . Therefore, the movable valve body 33 is lifted by the hydraulic pressure in the lubricating oil supply passage 14 on the cylinder block 1 side to the position (d) shown by the alternate long and short dash line in FIG. . As a result, the lubricating oil in the lubricating oil supply passage 14 on the cylinder block 1 side passes through the valve housing 31 in order from the fluid inlet 38 on one end side of the through hole 32 of the valve housing 31, as shown by the arrow in FIG. It flows through the space S between the hole 32, the seat portion 34b and the through hole 32 of the valve housing 31, the communication hole 37 and the flow hole 36, and flows into the lubricating oil supply passage 15 on the cylinder head 2 side.

At this time, an upward force is applied to the movable valve body 33 due to the viscosity of the lubricating oil that flows upward in the valve housing 31 of the check valve V ′ in FIG. The viscous force pushes against the seating portion 34b to seat it.

By the way, in the above-described embodiment, the seating portion 34b of the movable valve element 33 projects from the fitting portion 34a of the stopper member 34 toward one end of the through hole 32 of the valve housing 31, and Since the communication hole 37 that connects the through hole 32 and the flow hole 36 of the stopper member 34 is formed by cutting the seat portion 35 of the movable valve body 33 from its projecting end toward the fitting portion 34a, The diameter of the seat portion 34b can be increased. As a result, when the lubricating oil (fluid) flows through the through hole 32 of the valve housing 31 from one end side to the other end side, the movable valve body 33 is relatively separated from the axis of the through hole 32 by the seat portion 34b. Can be supported in position. That is, it is possible to increase the diameter b (see FIG. 2) of the contact portion of the seat portion 34b with the movable valve element 33.

Further, the lubricating oil flowing from the through hole 32 of the valve housing 31 into the flow hole 36 of the stopper member 34 is on the inner surface 37a of the communication hole 37 which is separated from the projecting end of the seat portion 34b on which the movable valve body 33 is seated. Since the flow direction can be changed, the flow of the lubricating oil is not disturbed in the vicinity of the movable valve element 33, so that no turbulent flow is generated.

In addition, since the inner side surface 37a of the communication hole 37 gradually increases from the space S between the seat portion 34b and the through hole 32 of the valve housing 31 toward the flow hole 36, the valve housing 31 Lubricating oil in the through hole 32 changes its direction gently in the communicating hole 37 and flows into the flow hole 36 of the stopper member 34, so that the flow of lubricating oil around the movable valve element 33 is less likely to be disturbed.

Further, since the communication hole 37 is located symmetrically with respect to the axial center of the stopper member 34, the communication hole 37 extends from the through hole 32 of the valve housing 31 toward the flow hole 37 of the stopper member 34. The flowing lubricating oil flows symmetrically with respect to the axis of the stopper member 34. As a result, a force is uniformly applied to the movable valve element 33 from the lubricating oil toward the seating portion 34b of the stopper member 34. Therefore, when the lubricating oil flows in a direction that urges the movable valve body 33 toward the seat portion 34b, the force acting on the movable valve body 33 converges in the direction that moves the movable valve body 33 toward the seat portion 34b. Then, the movable valve body 33 is quickly and stably seated on the seat portion 34b.

Therefore, in the check valve V ′ according to the above-described embodiment, the support stability of the movable valve element 33 in the seating portion 34b is enhanced, and even if the flow velocity of the lubricating oil flowing in the valve housing 31 is increased. The movable valve element 33 is not separated from the seat portion 34b, and the inner surface of the through hole 32 of the valve housing 31, the valve seat 35, or the seat portion 34b can be prevented from being damaged.

The stopper member 34 can be manufactured by plastic working such as cold forging, or sintering. Therefore, when the communication hole 37 of the stopper member 34 is formed, "burr" or "burr" unlike in the case of machining is not generated, so that post-processing is unnecessary and the productivity of the check valve V'is improved. Further, since a large amount of equipment cost as in the case of electric discharge machining is not required, the manufacturing cost of the check valve can be reduced.

All the members of the check valve V ′ can be made of plastic. In this way, the check valve can be made lighter in weight and can be easily molded.

The movable valve element 33 is not limited to the spherical shape, but may be, for example, a spindle type or a conical type.

INDUSTRIAL APPLICABILITY The present invention can be used not only in the lubrication circuit of an automobile engine but also in a check valve in a hydraulic circuit.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the configuration of an embodiment of a check valve according to the present invention.

FIG. 2 is a sectional view taken along the line III-III in FIG.

FIG. 3 is an explanatory diagram of a mounting position of an automobile engine and a check valve mounted thereto.

FIG. 4 is a vertical cross-sectional view showing the structure of a conventional check valve.

5 is a cross section taken along line II-II in FIG.

[Explanation of symbols]

 31 valve housing 32 through hole 33 movable valve body 34 stopper member 34a fitting portion 34b seating portion 35 valve seat 36 flow hole 37 communication hole 37a inner surface of the communication hole which is an inclined surface S space V'check valve

Claims (6)

[Scope of utility model registration request] 1. A movable valve body is accommodated in a through hole inside a valve housing, and the movable valve body is movable with respect to the movement of a fluid moving inside the through hole from one end side to the other end side. Is urged by the fluid to separate from the valve seat portion arranged on one end side of the through hole to allow the fluid to pass through the valve housing, while the inside of the through hole is extended from the other end side to the one end side. A check valve for preventing the movement of the fluid by moving the movable valve element toward the valve seat portion against the movement of the fluid moving toward the A fitting portion that fits into the opening, and a diameter that is smaller than the diameter of the through hole of the valve housing, project from the fitting portion toward the one end of the through hole, and from the valve seat portion at the projecting end. The movable valve element is stopped and supported at the time of separation A movable valve body stopper member having a seat portion of the valve body and a through hole through which the fluid flows is provided in an axial center portion, and the seat portion of the stopper member extends from its projecting end toward the fitting portion. A check valve, which is cut and provided with a communication hole for communicating a space between the seat and the through hole of the valve housing and a communication hole of the seat. 2. The check valve according to claim 1, wherein the communication holes are arranged symmetrically with respect to the axis of the stopper member. 3. The cutting depth of the communication hole is gradually increased from the space between the seating portion and the through hole of the valve housing toward the flow hole. Check valve. 4. The check valve according to claim 1, wherein the stopper member is formed by sintering. 5. The check valve according to claim 1, wherein the stopper member is formed by cold forging. 6. The check valve according to claim 1, wherein all the members are made of plastic.