JP3361987B2 - Check valve and seat valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve and a seating valve having little deformation of a seat, and a satisfactory sealability. SOLUTION: This check valve is composed of an accommodation space 36 formed in a fluid passage 8; a body 41a formed with a passage hole 41b along the center axis; a head part 41c raised in a one side end face of the body 41a along the outer periphery of the passage hole 41b and formed with a seat 41d at the end part; a seating valve 41 arranged with one end face on the opposite side of the head part 41c allowed to abut to the bottom surface 25a of a recess 25; a valve element 32 having a seat surface abutting to the seat 41d; an elastic member 33 compressedly accommodated an accommodation space 36 and urging the valve element 32 in the direction of the seat 41d; and a fixing member 31 for fixing the seating valve 41 to the bottom of the recess 25 by applying a load to a shoulder part of the body 41a in the direction of the center axis. With this arrangement, a thin wall part 41g is formed between a loading point of the shoulder part 41e and the seat 41d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve that allows fluid to pass in only one direction, and more particularly to a check valve and a seat valve that have good sealing properties.

[0002]

2. Description of the Related Art A diesel engine is widely known as an internal combustion engine of a type in which fuel is injected in a cylinder of the engine, which is called a so-called direct injection internal combustion engine or a direct injection internal combustion engine. In recent years, as a spark ignition engine (gasoline engine), a cylinder injection type has also been proposed. In such an in-cylinder injection internal combustion engine, in order to improve engine performance and reduce exhaust gas, the fuel injection pressure is increased to atomize the fuel spray, and the fuel injection period tends to be shortened. Further, in an engine equipped with a supercharging mechanism, a high fuel injection pressure corresponding to the supercharging pressure is required during supercharging. Therefore, the fuel supply system in the cylinder injection type internal combustion engine is designed to obtain a sufficiently high fuel injection pressure of, for example, about 10 atmospheres.

FIG. 12 is a system diagram showing a conventional fuel supply system. In FIG. 12, the delivery pipe 1 has injectors 1a corresponding to the number of cylinders of the engine (not shown). Between the delivery pipe 1 and the fuel tank 2,
A high-pressure fuel pump 3 is arranged. Delivery pipe 1
The high pressure fuel pump 3 and the high pressure fuel pump 3 are connected by a high pressure fuel passage 4. The high-pressure fuel pump 3 and the fuel tank 2 are connected by a low-pressure fuel passage 5.

The drain 6 of the high-pressure fuel pump 3 is returned to the fuel tank 2. A check valve 7 is provided in the high pressure fuel passage 4 on the discharge side of the high pressure fuel pump 3. A high pressure fuel pump 3 is provided between the high pressure fuel passage 4 and the low pressure fuel passage 5.
A bypass passage 8 is provided so as to bypass the. A check valve 9 is provided in the middle of the bypass passage 8.
The high-pressure fuel pump 3, the bypass passage 8, the check valve 7 and the check valve 9 are integrally configured as a high-pressure fuel pump body 100.

A low-pressure fuel pump 10 is provided at the end of the low-pressure fuel passage 5 on the fuel tank 2 side. A filter 11 is provided at the fuel intake port of the low-pressure fuel pump 10. A check valve 12 is provided in the low pressure fuel passage 5 on the discharge side of the low pressure fuel pump 10.
A low pressure regulator 14 is provided in the low pressure fuel passage 5 between the high pressure fuel pump 3 and the low pressure fuel pump 10. A filter 15 is provided at the fuel intake port of the low pressure regulator 14. The drain 16 of the low-pressure regulator 14 is returned to the fuel tank 2.

The delivery pipe 1 further has a high pressure fuel passage 18 on the side opposite to the high pressure fuel pump 3. A high pressure regulator 20 is provided in the high pressure fuel passage 18. The drain 21 of the high pressure regulator 20 is returned to the fuel tank 2.

FIG. 13 is a sectional view showing the details of the conventional check valve 9. FIG. 14 is a sectional view of the seat valve.
In FIGS. 13 and 14, a check valve 9 is provided in the bypass passage 8 formed in the casing 3 a of the high-pressure fuel pump 3. Details of the check valve 9 will be described. A substantially cylindrical recess 25 is formed in the casing 3a. The bottom surface 25a of the recess 25 communicates with the low-pressure side (upstream side) of the bypass passage 8 and the side surface 25b communicates with the high-pressure side (downstream side) of the bypass passage 8.

A seat valve 30 is provided at the bottom of the recess 25. In the seat valve 30, a substantially columnar main body 3 having a passage hole 30b formed along a central axis thereof.
0a and a neck portion 30c which is provided upright on the one end surface of the main body 30a along the entire circumference of the passage hole 30b. The inner peripheral portion of the front end of the neck portion 30c is formed as a slope of about 45 degrees toward the center, and a seat seat 30d is formed. On the other hand, an O-ring groove 30f is formed on the outer peripheral surface of the main body 30a. An O-ring 34 is housed in the O-ring groove 30f. The seat valve 30 is fixed to the bottom surface 25a of the recess 25 by pressing the shoulder portion 30e of the main body 30a with the cap 31.

The cap 31 has a substantially cylindrical shape with a recess 31a formed on one side from the end face along the central axis, and is arranged in the recess 25 so that the recess 31a faces the bottom of the recess 25 for plugging. It is set up. On the outer peripheral surface of the cap 31,
An O-ring groove 31d is formed. An O-ring 35 is housed in the O-ring groove 31d. The recess 25 and the cap 31 form a storage space 36 provided in the middle of the bypass passage 8. The cylindrical portion 31b formed around the recess 31a of the cap 31 has a through hole 31c through which fuel passes. The cap 31 presses the shoulder portion 30e of the seat valve 30 with the tip of the tubular portion 31b. The other end of the cap 31 is fixed by a plate 38. The plate 34 is fixed to the casing 3a with screws 39.

The cap 31 has a ball 3 in the recess 31a.
Holds 2. A spring 33 is contracted between the ball 32 and the cap 31. Ball 32
The entire surface constitutes a sealing surface and is in contact with the seat 30d. The spring 33 normally presses the ball 32 against the seat seat 30d. However, when the pressure of the fuel on the low pressure side (upstream side) of the bypass passage 8 becomes larger than the restoring force of the spring 33, the spring 33 loses the pressure and contracts to allow the fuel to pass. The check valve 7 also has a similar configuration.

In the fuel supply device having such a structure, the fuel pressurized to some extent by the low pressure fuel pump 10 is
The delivery pipe 1 is further pressurized by the high-pressure fuel pump 3.
And is injected from the injector 1a into a cylinder of an engine (not shown). At this time, the discharge pressure from the low pressure fuel pump 10 is stabilized within a predetermined range by the low pressure regulator 14, and the discharge pressure from the high pressure fuel pump 3 is stabilized within a predetermined range by the high pressure regulator 20.

Generally, the low-pressure fuel pump 10 is driven by, for example, a motor and is always driven when the power is turned on, whereas the high-pressure fuel pump 3 is driven by the engine. Therefore, when the engine is started, it is difficult to supply fuel from the low pressure fuel passage 5 to the high pressure fuel passage 4 side through the high pressure fuel pump 3. In order to eliminate this point, the bypass passage 8 is provided between the high pressure fuel passage 4 and the low pressure fuel passage 5 as described above.

During operation of the engine, the high pressure fuel pump 3 is driven and the high pressure fuel passage 4 and the high pressure fuel passage 18 are filled with high pressure fuel. On the other hand, when the engine is stopped, the supply of pressure to the high pressure fuel passage 4 and the high pressure fuel passage 18 is cut off. At this time, if the pressure in the pipe disappears, the temperature at which the fuel evaporates decreases and the fuel evaporates. When the fuel evaporates, the startability is poor when the engine is started next time. Therefore, the high-pressure fuel passage 4 and the bypass passage 8 are provided with the check valve 7 and the check valve 9.
Even if the engine stops, the high-pressure fuel passage 4 and the high-pressure fuel passage 18
Is designed to maintain a predetermined pressure.

[0014]

In the check valve 9 having such a structure, in order to withstand the high pressure in the bypass passage 8 and to ensure the sealing performance, the seat valve 3
0 is firmly fixed to the bottom surface 25a of the recess 25. Then, the seat valve 30 is deformed because the shoulder portion 30e is firmly pressed by the cap 31. This variant is
This is a problem because the sealability of the seat 30d and the check valve 9 is impaired. The same applies to the check valve 7.

FIG. 15 is a sectional view showing how the seat valve 30 is deformed. The cap 31 is the seat valve 30.
The load point I of the shoulder portion 30e is pressed by a force as indicated by an arrow in the figure. At this time, the seat 30d is deformed by the deformation amount II. That is, it deforms so as to spread outward.

In general, in order to improve the sealing property, the seat valve 30 and the ball 32 are hit before being assembled as the check valve 9. That is, the ball 32 is pressed against the seat seat 30d,
The contact position of is slightly depressed. However, when the seat seat 30d is deformed as described above, the ball 32 comes into contact with a place different from the place where it hits, and the sealing performance is not improved.

On the other hand, the shoulder portion 30e of the seat valve 30 and the tip portion of the cap 31 are machined with high precision, but have a slight dimensional error. This dimensional error does not make the force pressing the shoulder portion 30e of the seat valve 30 constant in the circumferential direction. Therefore, the deformation amount II in FIG. 15 is not constant along the circumferential direction but is deformed in a wavy manner. Therefore, a gap is more likely to be formed between the ball 32 and the seat 30d, and the sealing performance is impaired.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a check valve and a seat valve that have a small amount of deformation of the seat and have a good sealing property.

[0019]

According to a first aspect of the present invention, there is provided a check valve provided in the middle of a fluid passage, at least one side of which is a cylindrical concave portion, and a bottom surface of the concave portion communicates with an upstream portion of the fluid passage and the other side. And a storage space communicating with a downstream portion of the fluid passage, and an O-ring groove is formed on the outer peripheral surface to form a passage hole along the central axis and a shoulder portion is formed on the outer peripheral portion of one end surface. It has a columnar main body and a neck with a seat seat formed at the tip and is erected upright along the outer periphery of the passage hole in the center of the end surface on the side having the shoulder of the main body. A seat valve arranged with its end face in contact with the bottom surface of the recess,
It is located in the O-ring groove and has the storage space and the seal.
An O-ring that seals between the valve and the valve, a valve body that is housed in the storage space and abuts the seat surface against the seat seat, and an elastic member that is compressed in the storage space and biases the valve body toward the seat seat, In a check valve having a fixing member for fixing a seat valve to the bottom of a recess by applying a load to the shoulder in the direction of the central axis of the main body, a thin portion is formed between the load point of the shoulder and the seat. There is.

According to another aspect of the present invention, in the check valve, at least one side of the check valve is provided in the middle of the fluid passage, the bottom surface of the depression communicates with the upstream portion of the fluid passage, and the other side has the downstream portion of the fluid passage. And a storage space that communicates with
A passage hole is formed along the central axis and has a cylindrical main body having a shoulder portion on the outer peripheral portion of one end surface, and is provided upright along the outer periphery of the passage hole at the center portion of the end surface of the main body on the shoulder side. The seat valve has a neck portion having a seat seat formed at its tip, and the seat valve is press-fitted into the recess so that the end surface of the main body opposite to the neck portion is in contact with the bottom of the recess. In a check valve having a valve body for bringing a seat surface into contact with a seat seat and an elastic member contracted in a storage space and biasing the valve body toward the seat seat, a thin wall portion is provided between the seat seat and the main body. Are formed.

In the check valve of claim 3, the thin-walled portion is
The outer peripheral portion of the neck portion is formed by annularly removing the thickness.

In the check valve of claim 4, the thin-walled portion is
The base portion of the shoulder portion is formed by annularly removing the thickness.

In the check valve of claim 5, the thin portion is
The thickness of the shoulder portion is smaller than that of the neck portion.

In the check valve of claim 6, the valve element is a ball type.

In the check valve of claim 7, the valve element is a poppet type.

In the seat valve of claim 8, the outer circumference is
O-ring groove is formed in the surface, a passage hole is formed along the central axis, and a cylindrical main body having a shoulder portion on the outer peripheral portion of one end surface, and a passage in the central portion of the end surface of the main body on the side having the shoulder portion A neck portion having a seat seat formed on the tip end portion, which is provided along the outer periphery of the hole, is provided in the middle of the fluid passage, and at least one side is a cylindrical depression, and the bottom surface of the depression is upstream of the fluid passage. Seat valve in which the end face of the main body opposite to the neck is brought into contact with the bottom of the recess and the shoulder is pressed in the central axis direction to be fixed in the storage space in which the downstream side of the fluid passage communicates with the other side. In, the thin portion is formed between the load point of the shoulder portion and the seat seat.

According to another aspect of the seat valve of the present invention, there is provided a cylindrical main body having a passage hole formed along the central axis and having a shoulder portion on the outer peripheral portion of one end surface, and the end surface of the main body on the side having the shoulder portion. It has a neck portion which is erected along the outer periphery of the passage hole in the center portion and a seat seat is formed at the tip portion, and is provided in the middle of the fluid passage, and at least one side is a cylindrical concave portion, and the bottom surface of the concave portion is formed. In a seat valve in which a main body is press-fitted into a recess so that an end face opposite to a neck portion of the main body comes into contact with a bottom surface of the recess in a storage space in which an upstream portion of the fluid passage communicates with a downstream portion of the fluid passage communicating with the other side, A thin portion is formed between the seat and the body.

In the seat valve of the tenth aspect, the thin wall portion is formed by annularly removing the outer peripheral portion of the neck portion.

In the seat valve of the eleventh aspect, the thin wall portion is formed by annularly thinning the root portion of the shoulder portion.

In the seat valve of the twelfth aspect, the thin portion is formed such that the thickness of the shoulder portion is thinner than that of the neck portion.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is a cross-sectional view of the check valve of the present invention. FIG. 2 is a sectional view of the seat valve. 1 and 2, a check valve 40 is provided in the middle of the bypass passage 8 which is a fluid passage formed in the casing 3a of the high-pressure fuel pump 3. The details of the check valve 40 will be described. A substantially cylindrical recess 25 is formed in the casing 3a. The low pressure side (upstream side) of the bypass passage 8 communicates with the bottom surface 25a of the recess 25,
The high-pressure side (downstream side) of the bypass passage 8 communicates with the side surface 25b.

A seat valve 41 is arranged at the bottom of the recess 25. The seat valve 41 is made of, for example, stainless steel, and has a substantially cylindrical main body 41a in which a passage hole 41b is formed along a central axis, and one end surface of the main body 41a has an entire circumference along the outer periphery of the passage hole 41b. And a neck portion 41c that is erected over the entire length. Neck 41c
The inner peripheral portion of the front end of the is formed on a slope of about 45 degrees toward the center, and a seat seat 41d is formed. Seat seat 41
The outer peripheral portion of the neck portion 41c, which is the back side of d, is partly annularly thinned to form a thin portion 41g. On the other hand, the main body 4
An O-ring groove 41f is formed on the outer peripheral surface of 1a.
The O-ring 34 is housed in the O-ring groove 41f. In the seat valve 41, the shoulder portion 41e of the main body 41a is pressed in the central axis direction by the cap 31 which is a fixing member,
It is fixed to the bottom surface 25 a of the recess 25.

The cap 31 is made of, for example, stainless steel and has a substantially columnar shape in which a recess 31a is formed on one side from the end face along the central axis, and the recess 31a is plugged with the recess 25 facing the bottom. Is disposed in the recess 25. An O-ring groove 31d is formed on the outer peripheral surface of the cap 31. An O-ring 35 is housed in the O-ring groove 31d. The recess 25 and the cap 31 form a storage space 36 provided in the middle of the bypass passage 8. The cylindrical portion 31b formed around the recess 31a of the cap 31 has a through hole 31c through which fuel passes. The cap 31 presses the shoulder portion 41e of the seat valve 41 with the tip of the tubular portion 31b. The other end of the cap 31 is fixed by a plate 38. The plate 34 is fastened to the casing 3a with a screw (not shown).

The cap 31 accommodates a ball 32, which is a valve body, in a recess 31a. Ball 32 and cap 3
A spring 33, which is an elastic member, is contracted between the first and second terminals. The entire surface of the ball 32 constitutes a sealing surface and is in contact with the seat seat 41d. Spring 33
Always presses the ball 32 against the seat seat 41d. However, when the pressure of the fuel on the low pressure side (upstream side) of the bypass passage 8 becomes larger than the restoring force of the spring 33, the spring 33 loses the pressure of the fuel and contracts to allow the fuel to pass.

In the check valve 40 thus constructed, the check valve 40 is provided in the middle of the bypass passage 8 so as to prevent the reverse flow of fuel and maintain a predetermined pressure in the bypass passage 8. Also, a similar check valve 40 is provided in the high-pressure fuel passage 4.
Is provided.

FIG. 3 is a sectional view showing how the seat valve 41 is deformed. The cap 31 presses the load point I of the shoulder portion 41e of the seat valve 41 with a force indicated by an arrow in the figure. At this time, since the outer peripheral portion of the neck portion 41c is partially thinned in an annular shape to form a thin portion 41g, the shoulder portion 41c
It is difficult for the deformation of e to be transmitted to the seat seat 41d. And
The seat seat 41d is deformed by the deformation amount II. This deformation amount is smaller than the conventional deformation amount.

In the check valve 40 thus constructed, the outer peripheral portion of the neck portion 41c of the seat valve 41 is partly annularly thinned to form a thin portion 41g.
The deformation amount of the seat seat 41d is smaller than the conventional deformation amount.
Therefore, the sealability between the ball 32 and the seat seat 41d is improved. Further, the seat valve 41 can be fixed with a stronger pressing force, and the seat valve 41 can be used for a higher pressure fuel passage. Further, since it is possible to allow the bias of the pressing force when fixing the seat valve 41 to some extent, the processing accuracy of the seat valve 41 and the cap 31 can be relaxed.

Embodiment 2. FIG. 4 is a sectional view showing another example of the check valve of the present invention. FIG. 5 is a sectional view of the seat valve. 4 and 5, the bypass passage 8
A check valve 50 is provided midway. In the seat valve 51, a substantially columnar main body 51a in which a passage hole 51b is formed along a central axis, and a main body 51a, which is erected on one end face of the main body 51a along the outer periphery of the passage hole 51b, over the entire circumference. And a neck portion 51c. An inner peripheral portion of the front end of the neck portion 51c is formed as a slope of about 45 degrees toward the center, and a seat seat 51d is formed. On the other hand, the main body 51
An O-ring groove 51f is formed on the outer peripheral surface of a. O
The O-ring 34 is housed in the ring groove 51f. The seat valve 51 is fixed to the bottom surface 25 a of the recess 25 by pressing the shoulder 51 e of the main body 51 a with the cap 31. At the root of the shoulder 51e, a thin portion 51g is formed by partially removing the thickness in an annular shape. Other configurations are similar to those of the first embodiment.

FIG. 6 is a sectional view showing how the seat valve 51 is deformed. The cap 31 presses the load point I of the shoulder 51e of the seat valve 51 with a force as indicated by an arrow in the figure. At this time, in the root portion of the shoulder portion 51e, a part is thinned annularly to form a thin portion 51g,
The deformation of the shoulder 51e is difficult to be transmitted to the seat 51d.
Then, the seat seat 51d is deformed by the deformation amount II. This deformation amount is smaller than the conventional deformation amount.

In the check valve 50 constructed in this manner, the root portion of the shoulder portion 51e is partly annularly thinned to form a thin portion 51g.
The deformation amount of 1d is smaller than the conventional deformation amount. for that reason,
The sealing property is improved, and the same effect as that of the first embodiment can be obtained. Further, since the thin portion 51g is formed at the root portion of the shoulder portion 51e, it is easy to process.

Embodiment 3. FIG. 7 is a cross-sectional view showing another example of the check valve of the present invention. FIG. 8 is a sectional view of the seat valve. 7 and 8, the bypass passage 8
A check valve 60 is provided midway. In the seat valve 61, a substantially columnar main body 61a in which a passage hole 61b is formed along the central axis, and an end face on one side of the main body 61a are provided upright over the entire circumference along the outer periphery of the passage hole 61b. And a neck portion 61c. The inner peripheral portion of the front end of the neck portion 61c is formed as a slope of about 45 degrees toward the center, and a seat seat 61d is formed. On the other hand, the body 61
An O-ring groove 61f is formed on the outer peripheral surface of a. O
The O-ring 34 is housed in the ring groove 61f. The seat valve 61 is fixed to the bottom surface 25 a of the recess 25 by pressing the shoulder 61 e of the main body 61 a with the cap 31. Further, in the present embodiment, the shoulder portion 6
The thickness B of 1e is smaller than the thickness A of the neck portion 61c. The thickness B of the shoulder portion 61e means the neck portion 61c of the main body 61a.
7 is the thickness from the end face on the side to the upper end of the O-ring groove 61f in FIG. Other configurations are similar to those of the first embodiment.

FIG. 9 is a sectional view showing how the seat valve 61 is deformed. The cap 31 presses the load point I on the shoulder 61e of the seat valve 61 with a force as indicated by an arrow in the figure. At this time, since the thickness B of the shoulder 61e is smaller than the thickness A of the neck 61c, the deformation of the shoulder 61e is hard to be transmitted to the seat 61d. Then, the seat seat 61d is deformed by the deformation amount II. This deformation amount is smaller than the conventional deformation amount.

In the check valve 60 thus constructed, the shoulder 61e is thinner than the neck 61c, so that the seat 61d is deformed less than the conventional one. Therefore, the sealing property is improved, and the same effect as that of the first embodiment can be obtained. In addition, the thin part,
Since the shoulder portion 61e is formed to be thin, it is easier to process. In the present embodiment, the shoulder 6
The thickness B of 1e is the thickness from the end surface of the main body 61a on the neck portion 61c side to the upper end of the O-ring groove 61f in FIG.
For those without the ring groove 61f, the shoulder thickness B
Is the thickness of the body. Also in the seat valve having such a shape, for example, the lower end face and the bottom face 2 of FIG.
In the case where an elastic member such as a seal member is arranged between the elastic member 5a and 5a, if the thickness B of the shoulder is smaller than the thickness A of the neck, the present embodiment The same effect as can be obtained.

Fourth Embodiment FIG. 10 is a cross-sectional view showing another example of the check valve of the present invention. In FIG. 10, the valve body of the present embodiment is a poppet type valve body 42. The valve body 42 has a substantially conical shape, and has a conical seat surface 42a.
Is in contact with the seat seat 41d of the seat valve 41. Other configurations are similar to those of the first embodiment. Even with the check valve configured as described above, the same effect as that of the first embodiment can be obtained.

Embodiment 5. FIG. 11 is a cross-sectional view showing another example of the check valve of the present invention. 11, in the seat valve 71 of the present embodiment, a substantially columnar main body 71a having a passage hole 71b formed along a central axis, and an end surface on one side of the main body 71a along the outer periphery of the passage hole 71b. And a neck portion 71c standing upright over the entire circumference. The inner circumference of the tip of the neck 71c is about 45 toward the center.
The seat seat 71d is formed on the inclined surface. The outer peripheral portion of the neck portion 71d, which is the back side of the seat seat 71d, is partly annularly thinned to form a thin portion 71g. The seat valve 71 has a main body 71 a press-fitted into the recess 25 and is fixed to the bottom surface 25 a of the recess 25. Other configurations are similar to those of the first embodiment.

In the check valve thus constructed,
Since the main body 71a of the seat valve 71 is press-fitted into the recess 25, the seat valve 71 is deformed by receiving a pressing force in the radial direction. However, the outer peripheral portion of the neck portion 71d is partially thinned into an annular shape and the thin portion 71 is formed.
Since g is formed, the deformation amount of the seat seat 71d is small. Therefore, the same effect as that of the first embodiment can be obtained.

[0047]

In the check valve according to the first aspect of the present invention, the check valve is provided in the middle of the fluid passage, at least one side of which is a cylindrical depression, the bottom of the depression communicates with the upstream portion of the fluid passage, and the other side of which has the fluid passage. A cylindrical body having a storage space communicating with the downstream portion, and a storage body housed in the storage space, having an O-ring groove formed on the outer peripheral surface, a passage hole formed along the central axis, and a shoulder portion on the outer peripheral portion of one end surface. And a neck portion having a seat seat formed at the tip end thereof which is provided upright along the outer periphery of the passage hole in the center of the end surface on the side having the shoulder portion of the main body, and the end surface on the side opposite to the neck portion of the main body is recessed. A seat valve that is placed in contact with the bottom surface, a valve body that is housed in the storage space to bring the seat surface into contact with the seat seat, and an elasticity that is compressed in the storage space and urges the valve body toward the seat seat. The seat valve is fixed to the bottom of the recess by applying a load to the member and the shoulder in the direction of the central axis of the main body. In the check valve and a fixing member for thin portion is formed between the load point and the seat of the shoulder. Therefore, the deformation amount of the seat seat is smaller than the conventional deformation amount. This improves the sealability between the valve body and the seat. In addition, the seat valve can be fixed with a stronger pressing force, and the seat valve can be used for a higher pressure fuel passage. Further, since it is possible to allow the bias of the pressing force when fixing the seat valve to some extent, the processing accuracy of the seat valve and the fixing member can be relaxed.

In the check valve of the second aspect, the check valve is provided in the middle of the fluid passage, and at least one side is a cylindrical concave portion, the upstream portion of the fluid passage communicates with the bottom surface of the concave portion, and the downstream portion of the fluid passage on the other side. And a storage space that communicates with
A passage hole is formed along the central axis and has a cylindrical main body having a shoulder portion on the outer peripheral portion of one end surface, and is provided upright along the outer periphery of the passage hole at the center portion of the end surface of the main body on the shoulder side. The seat valve has a neck portion having a seat seat formed at its tip, and the seat valve is press-fitted into the recess so that the end surface of the main body opposite to the neck portion is in contact with the bottom of the recess. In a check valve having a valve body for bringing a seat surface into contact with a seat seat and an elastic member contracted in a storage space and biasing the valve body toward the seat seat, a thin wall portion is provided between the seat seat and the main body. Are formed. Therefore, the amount of deformation of the main body that is generated by being press-fitted into the recess is less likely to be transmitted to the seat seat, and the amount of deformation of the seat seat becomes smaller than the conventional deformation amount. Then, the sealing property between the valve body and the seat is improved.

In the check valve of claim 3, the thin portion is
The outer peripheral portion of the neck portion is formed by annularly removing the thickness. Therefore, the thin portion can be easily created.

In the check valve according to claim 4, the thin portion is
The base portion of the shoulder portion is formed by annularly removing the thickness. Therefore, the thin portion can be created more easily.

In the check valve of claim 5, the thin portion is
The thickness of the shoulder portion is smaller than that of the neck portion. Therefore, the thin portion can be created more easily.

In the check valve of claim 6, the valve element is a ball type. Therefore, the sealability can be improved in the check valve having the ball-shaped valve body.

In the check valve of claim 7, the valve element is a poppet type. Therefore, the sealability can be improved in the check valve having the poppet type valve body.

In the seat valve of claim 8, the outer circumference is
O-ring groove is formed in the surface, a passage hole is formed along the central axis, and a cylindrical main body having a shoulder portion on the outer peripheral portion of one end surface, and a passage in the central portion of the end surface of the main body on the side having the shoulder portion A neck portion having a seat seat formed on the tip end portion, which is provided along the outer periphery of the hole, is provided in the middle of the fluid passage, and at least one side is a cylindrical depression, and the bottom surface of the depression is upstream of the fluid passage. Seat valve in which the end face of the main body opposite to the neck is brought into contact with the bottom of the recess and the shoulder is pressed in the central axis direction to be fixed in the storage space in which the downstream side of the fluid passage communicates with the other side. In, the thin portion is formed between the load point of the shoulder portion and the seat seat. Therefore, the deformation amount of the seat seat is smaller than the conventional deformation amount. This improves the sealability between the valve body and the seat. Further, the seat valve can be fixed with a stronger pressing force, and the seat valve can be used as a check valve arranged in a higher pressure fuel passage. further,
Since it is possible to allow the bias of the pressing force at the time of fixing the seat valve to some extent, the processing accuracy of the seat valve can be relaxed.

According to another aspect of the seat valve of the present invention, there is formed a cylindrical main body having a passage hole formed along the central axis and having a shoulder portion on the outer peripheral portion of one end surface, and the end surface of the main body on the side having the shoulder portion. It has a neck portion which is erected along the outer periphery of the passage hole in the center portion and a seat seat is formed at the tip portion, and is provided in the middle of the fluid passage, and at least one side is a cylindrical concave portion, and the bottom surface of the concave portion is formed. In a seat valve in which a main body is press-fitted into a recess so that an end face opposite to a neck portion of the main body comes into contact with a bottom surface of the recess in a storage space in which an upstream portion of the fluid passage communicates with a downstream portion of the fluid passage communicating with the other side, A thin portion is formed between the seat and the body. Therefore, the deformation amount of the main body that is generated by being press-fitted into the recess is less likely to be transmitted to the seat seat, and the deformation amount of the seat seat is reduced, so that the sealing performance between the valve body and the seat seat is improved.

In the seat valve of the tenth aspect, the thin portion is formed by removing the outer peripheral portion of the neck portion in an annular shape. Therefore, the thin portion can be easily created.

In the seat valve of the eleventh aspect, the thin-walled portion is formed by removing the root portion of the shoulder portion in an annular shape. Therefore, the thin portion can be created more easily.

According to the twelfth aspect of the seat valve, the thin wall portion is formed such that the thickness of the shoulder portion is smaller than that of the neck portion. Therefore, the thin portion can be created more easily.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a check valve according to the present invention.

FIG. 2 is a sectional view of a seat valve.

FIG. 3 is a sectional view showing how the seat valve is deformed.

FIG. 4 is a cross-sectional view showing another example of the check valve of the present invention.

FIG. 5 is a cross-sectional view of a seat valve.

FIG. 6 is a cross-sectional view showing how the seat valve is deformed.

FIG. 7 is a cross-sectional view showing another example of the check valve of the present invention.

FIG. 8 is a sectional view of a seat valve.

FIG. 9 is a cross-sectional view showing how the seat valve is deformed.

FIG. 10 is a cross-sectional view showing another example of the check valve of the present invention.

FIG. 11 is a cross-sectional view showing another example of the check valve of the present invention.

FIG. 12 is a system diagram showing a conventional fuel supply system.

FIG. 13 is a cross-sectional view showing details of a conventional check valve.

FIG. 14 is a sectional view of a conventional seat valve.

FIG. 15 is a cross-sectional view showing how the conventional seat valve is deformed.

[Explanation of symbols]

4 high-pressure fuel passage (fluid passage), 8 bypass passage (fluid passage), 36 storage space, 41, 51, 61, 71
Seat valve, 41a, 51a, 61a, 71a main body, 41c, 51c, 61c, 71c neck, 41g,
51 g, 71 g thin wall portion, 42 valve body, 31 cap (fixing member), 32 ball (valve body), 33 spring (elastic member), 61e shoulder portion (thin wall portion).

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-72442 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 15/00-15/20

Claims (12)

(57) [Claims] 1. A fluid passage is provided in the middle of the passage, and at least
One side is a cylindrical recess, and the bottom surface of the recess is provided with
Storage that communicates with the upstream part and communicates with the downstream part of the fluid passage on the other side
Space and Stored in the above storage space,O-ring groove is formed on the outer peripheral surface
DoneA passage hole is formed along the central axis and the outer circumference of the end face on one side
A cylindrical body having a shoulder portion at the end and the shoulder portion of the body
Is installed upright along the outer periphery of the passage hole at the center of the end surface on the
And a neck portion having a seat seat formed on the tip end thereof.
The end surface on the side opposite to the neck portion is arranged in contact with the bottom surface of the recessed portion.
Seat valve,It is located in the O-ring groove and has the storage space and the seal.
O-ring that seals between the valve and The seat surface is stored in the storage space and the seat surface is touched.
The valve body to contact, The valve body is contracted in the storage space and the valve body is seated in the seat seat direction.
An elastic member that urges the Apply a load to the shoulder in the direction of the central axis of the main body, and
Fixing member for fixing the valve to the bottom of the recess.
In the check valve A thin portion is formed between the load point on the shoulder and the seat.
Check valve characterized by being 2. A storage space provided in the middle of the fluid passage, at least one side of which is a cylindrical depression, the bottom of the depression communicating with the upstream portion of the fluid passage and the other side communicating with the downstream portion of the fluid passage. A cylindrical main body housed in the storage space, having a passage hole formed along the central axis and having a shoulder portion on the outer peripheral portion of one end surface, and a central portion of the end surface of the main body on the side having the shoulder portion And a neck portion having a seat seat formed on the tip end thereof upright along the outer periphery of the passage hole, and the end portion of the main body opposite to the neck portion is formed in the recess so as to abut the bottom portion of the recess. A seat valve that is press-fitted and housed, a valve body that is housed in the housing space and abuts the seat surface against the seat seat, and a valve body that is contracted in the housing space is biased toward the seat seat. A check valve having an elastic member for A check valve, wherein a thin portion is formed. 3. The thin portion is formed by annularly thinning the outer peripheral portion of the neck portion.
Or the check valve described in 2. 4. The thin portion is formed by removing the root portion of the shoulder portion in an annular shape.
Or the check valve described in 2. 5. The check valve according to claim 1, wherein the thin portion is formed such that the thickness of the shoulder portion is thinner than that of the neck portion. 6. The check valve according to claim 1, wherein the valve body is a ball type. 7. The check valve according to claim 1, wherein the valve body is a poppet type. 8. A cylindrical main body having an O-ring groove formed on the outer peripheral surface, a passage hole formed along the central axis, and a shoulder portion on the outer peripheral portion of one end surface, and the shoulder portion of the main body. Has a neck with a seat seat formed at the tip end, which is provided in the middle of the fluid passage, and has a cylindrical recess on at least one side. , In the storage space in which the upstream portion of the fluid passage communicates with the bottom surface of the recess and the downstream portion of the fluid passage communicates with the other side,
In a seat valve in which an end surface of the main body opposite to the neck portion is in contact with the bottom surface of the recess and the shoulder portion is pressed in the central axis direction and fixed, a load valve between the shoulder portion and the seat seat is provided. A seat valve characterized in that a thin portion is formed on the. 9. A columnar main body having a passage hole formed along a central axis and having a shoulder portion on the outer peripheral portion of one end surface, and the passage at the center of the end surface of the main body on the side having the shoulder portion. A neck portion having a seat seat formed at the tip end and provided along the outer periphery of the hole, provided in the middle of the fluid passageway, at least one side of which is a cylindrical depression portion, and the fluid passageway is formed on the bottom surface of the depression portion. In the storage space in which the upstream part of the fluid passage communicates with the downstream side of the fluid passageway to the other side,
In a seat valve in which the main body is press-fitted into the recess so that an end surface of the main body on the side opposite to the neck portion contacts the bottom surface of the recess, a thin wall portion is formed between the seat and the main body. A seat valve characterized in that. 10. The seat valve according to claim 8, wherein the thin portion is formed by annularly thinning an outer peripheral portion of the neck portion. 11. The seat valve according to claim 8, wherein the thin-walled portion is formed by removing the root portion of the shoulder portion in an annular shape. 12. The seat valve according to claim 8, wherein the thin wall portion is formed such that the thickness of the shoulder portion is smaller than that of the neck portion.