JPH11230390A - Check valve and seating 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 for allowing a fluid to pass in only one direction, and more particularly to a check valve and a seat valve having good sealing properties.

[0002]

2. Description of the Related Art A diesel engine is widely known as a so-called direct injection type internal combustion engine or a direct injection type internal combustion engine in which fuel is injected into a cylinder of the engine. In recent years, in-cylinder injection ignition engines (gasoline engines) have been proposed. In such a direct injection internal combustion engine, in order to improve the performance of the engine and reduce the exhaust gas, there is a tendency that the fuel injection pressure is increased to atomize the fuel spray and shorten the fuel injection period. Further, in an engine having a supercharging mechanism, a high fuel injection pressure corresponding to the supercharging pressure is required at the time of supercharging. Therefore, the fuel supply system in the direct injection internal combustion engine is designed to obtain a sufficiently high fuel injection pressure of, for example, about 10 atm.

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 an engine (not shown). Between the delivery pipe 1 and the fuel tank 2,
A high-pressure fuel pump 3 is provided. 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.

[0004] 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 detour. 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 formed as a high-pressure fuel pump body 100.

A low-pressure fuel pump 10 is provided at an end of the low-pressure fuel passage 5 on the side of the fuel tank 2. A filter 11 is provided at a fuel intake 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 a fuel intake 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. The high-pressure fuel passage 18 is provided with a high-pressure regulator 20. The drain 21 of the high-pressure regulator 20 is returned to the fuel tank 2.

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

At the bottom of the recess 25, a seat valve 30 is provided. In the seat valve 30, a substantially cylindrical main body 3 having a passage hole 30b formed along a central axis.
0a, and a neck portion 30c which is provided on one end surface of the main body 30a along the outer circumference of the passage hole 30b over the entire circumference. The inner peripheral portion at the tip of the neck portion 30c is formed on a slope of about 45 degrees toward the center, and a 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 25 a of the recess 25 by pressing the shoulder 30 e of the main body 30 a with the cap 31.

The cap 31 has a substantially cylindrical shape having a concave portion 31a formed on one side along the central axis from an end face, and is disposed in the concave portion 25 so as to plug the concave portion 31a toward the bottom of the concave portion 25. Has been established. 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. A through hole 31c through which fuel passes is formed in a cylindrical portion 31b formed around the concave portion 31a of the cap 31. The cap 31 presses the shoulder 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 the ball 3 in the recess 31a.
2 are stored. 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 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 contracts due to the pressure and allows the fuel to pass. The check valve 7 has the same configuration.

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

Generally, the low-pressure fuel pump 10 is driven by, for example, a motor or the like, and is constantly driven when power is turned on, whereas the high-pressure fuel pump 3 is driven by an engine. Therefore, when the engine is started, it is difficult to supply the fuel from the low-pressure fuel passage 5 to the high-pressure fuel passage 4 through the high-pressure fuel pump 3. In order to solve this problem, 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 is lost, 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, a check valve 7 and a check valve 9 are provided in the high-pressure fuel passage 4 and the bypass passage 8, respectively.
The high-pressure fuel passage 4 and the high-pressure fuel passage 18
Maintain a predetermined pressure.

[0014]

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

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

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

On the other hand, the shoulder 30e of the seat valve 30 and the tip of the cap 31 are processed with high precision but have some dimensional errors. This dimensional error does not make the force pressing the shoulder 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 deforms in a wavy manner. For this reason, a gap is easily formed between the ball 32 and the seat 30d, and the sealing property is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a check valve and a seat valve having a small amount of deformation of a seat and good sealing properties.

[0019]

According to a first aspect of the present invention, there is provided a check valve provided in the middle of a fluid passage, wherein at least one side is a cylindrical recess, and an upstream portion of the fluid passage communicates with a bottom surface of the recess, and the other side. And a cylindrical main body, which is housed in the storage space, has a passage hole formed along the central axis, and has a shoulder at an outer peripheral portion of one end surface, and a shoulder of the main body. A central portion of the end surface having a neck portion having a seat portion formed upright along the outer periphery of the passage hole and having a seat seat at a distal end portion,
A seat valve arranged so that the end face opposite to the neck of the main body abuts against the bottom surface of the concave portion, a valve body housed in the housing space and abutting the seat surface on the seat seat, and contracted in the housing space. In a non-return valve having an elastic member for urging a valve body in a seat seat direction and a fixing member for applying a load to a shoulder in a central axis direction of the main body to fix the seat valve to the bottom of the concave portion, A thin portion is formed between the point and the seat.

According to a second aspect of the present invention, the check valve is provided in the middle of the fluid passage, and at least one side is a cylindrical recess, the bottom of the recess communicates with the upstream portion of the fluid passage, and the other side has the downstream portion of the fluid passage. It is stored in the storage space that communicates with the storage space,
A passage hole is formed along the central axis, and a cylindrical main body having a shoulder at an outer peripheral portion of one end face and a central portion of the end surface at a side having a shoulder portion of the main body are erected along the outer periphery of the passage hole. A seat valve having a neck with a seat seat formed at a front end thereof, a seat valve housed by being press-fitted into the recess so that an end surface opposite to the neck of the main body abuts against the bottom of the recess, and housed in the housing space. In a check valve having a valve body that abuts a seat surface on a seat seat and an elastic member that is contracted in a storage space and urges the valve body in a seat seat direction, a thin portion is provided between the seat seat and the main body. Are formed.

In the check valve of the third aspect, the thin portion is
The outer peripheral portion of the neck portion is formed by annularly removing the thickness.

In the check valve of the fourth aspect, the thin portion is
The base of the shoulder is formed by removing the wall in an annular shape.

In the check valve according to the fifth aspect, the thin portion is
The shoulder is formed to be thinner than the neck.

In the check valve according to the sixth aspect, the valve body is a ball type.

In a seventh aspect of the present invention, the valve body is a poppet type.

In the seat valve according to the eighth aspect, a cylindrical main body having a passage hole formed along the central axis and having a shoulder at an outer peripheral portion of one end face, and a cylindrical end body having a shoulder portion of the main body. A central portion is provided along the outer periphery of the passage hole and has a neck portion with a seat seat formed at a distal end portion, and is provided in the middle of the fluid passage, at least one side is a cylindrical concave portion, and a bottom surface of the concave portion is provided. In the storage space where the upstream part of the fluid passage communicates with the downstream part of the fluid passage on the other side, the end face opposite to the neck of the main body abuts against the bottom surface of the recess, and the shoulder is pressed and fixed in the central axis direction. In the seat valve, a thin portion is formed between the load point on the shoulder and the seat.

In the seat valve according to the ninth aspect, a cylindrical main body having a passage hole formed along the central axis and having a shoulder at an outer peripheral portion of one end face, and a cylindrical end face having a shoulder portion of the main body. A central portion is provided along the outer periphery of the passage hole and has a neck portion with a seat seat formed at a distal end portion, and is provided in the middle of the fluid passage, at least one side is a cylindrical concave portion, and a bottom surface of the concave portion is provided. A seat valve in which a main body is press-fitted into a concave portion so that an end surface opposite to a neck portion of the main body abuts against a bottom surface of the concave portion in a storage space in which an upstream portion of the fluid passage communicates with a downstream portion of the fluid passage on the other side. A thin portion is formed between the seat and the main body.

In the seat valve according to the tenth aspect, the thin portion is formed by removing an outer peripheral portion of a neck portion in an annular shape.

[0029] In the seat valve according to the eleventh aspect, the thin portion is formed by removing the base of the shoulder portion in an annular shape.

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

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a sectional view of a check valve according to 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 a bypass passage 8, which is a fluid passage formed in a casing 3a of the high-pressure fuel pump 3. The details of the check valve 40 will be described. A substantially cylindrical concave portion 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 concave portion 25,
The high-pressure side (downstream side) of the bypass passage 8 communicates with the side surface 25b.

At the bottom of the recess 25, a seat valve 41 is provided. 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 an end surface on one side of the main body 41a along the outer periphery of the passage hole 41b. And a neck portion 41c standing upright. Neck 41c
Is formed on a slope of about 45 degrees toward the center, and a seat 41d is formed. Seat seat 41
The outer peripheral portion of the neck portion 41c, which is the back side of d, has a portion thinned annularly to form a thin portion 41g. On the other hand, 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. The seat valve 41 is pressed against the shoulder 41e of the main body 41a in the central axis direction by the cap 31 as 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 with a concave portion 31a formed on one side from the end face along the central axis. The cap 31 is plugged with the concave portion 31a facing the bottom of the concave portion 25. Is provided in the recess 25. An O-ring groove 31 d 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. A through hole 31c through which fuel passes is formed in a cylindrical portion 31b formed around the concave portion 31a of the cap 31. The cap 31 presses the shoulder 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 screws (not shown).

The cap 31 houses a ball 32 as a valve in a recess 31a. Ball 32 and cap 3
A spring 33, which is an elastic member, is provided between the spring 1 and the spring 1. The entire surface of the ball 32 forms a sealing surface, and is in contact with the seat 41d. Spring 33
Always presses the ball 32 against the 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 contracts against the pressure of the fuel and allows the fuel to pass.

In the check valve 40 configured as described above, the check valve 40 is provided in the middle of the bypass passage 8 so as to prevent the backflow of the fuel and maintain a predetermined pressure in the bypass passage 8. A similar check valve 40 is also provided in the high-pressure fuel passage 4.
Are arranged.

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

In the check valve 40 configured as above, the outer peripheral portion of the neck portion 41c of the seat valve 41 is partially annularly thinned to form a thin portion 41g.
The deformation amount of the seat 41d is smaller than the conventional deformation amount.
Therefore, the sealing performance between the ball 32 and the seat 41d is improved. Further, the seat valve 41 can be fixed with a stronger pressing force, and can be used for a higher-pressure fuel passage. Furthermore, since the bias of the pressing force when fixing the seat valve 41 can be allowed to some extent, the processing accuracy of the seat valve 41 and the cap 31 can be reduced.

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
Is provided with a check valve 50 in the middle. In the seat valve 51, a substantially cylindrical main body 51a having a passage hole 51b formed along the central axis is provided, and is provided 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. The inner peripheral portion of the distal end of the neck portion 51c is formed on a slope of about 45 degrees toward the center, and a 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 base of the shoulder 51e, a thin portion 51g is formed by partially removing the wall in an annular shape. Other configurations are the same as those of the first embodiment.

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

In the check valve 50 configured as described above, a thin portion 51g is formed at a base portion of the shoulder portion 51e by partially removing the thin portion in a ring shape.
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 in the first embodiment can be obtained. Further, since the thin portion 51g is formed at the base of the shoulder portion 51e, processing is easy.

Embodiment 3 FIG. 7 is a 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 in the middle of. In the seat valve 61, a substantially cylindrical main body 61a having a passage hole 61b formed along a central axis, and an upright end is provided on one end surface of the main body 61a along the outer periphery of the passage hole 61b over the entire circumference. And a neck 61c. The inner peripheral portion of the distal end of the neck portion 61c is formed on a slope of about 45 degrees toward the center, and a seat 61d is formed. On the other hand, the main 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. In the present embodiment, the shoulder 6
The thickness B of 1e is smaller than the thickness A of the neck 61c. The thickness B of the shoulder 61e refers to the neck 61c of the main body 61a.
7 from the side end surface to the upper end of the O-ring groove 61f in FIG. Other configurations are the same as those of the first embodiment.

FIG. 9 is a cross-sectional view showing how the seat valve 61 is deformed. The cap 31 presses the load point I of the shoulder 61e of the seat valve 61 with a force as shown 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, it is difficult for the deformation of the shoulder 61e to be transmitted to the seat 61d. Then, the 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 configured, since the thickness of the shoulder 61e is smaller than the thickness of the neck 61c, the deformation of the seat 61d is smaller than the conventional deformation. Therefore, the sealing performance is improved, and the same effect as in the first embodiment can be obtained. In addition, the thin part
Since the shoulder portion 61e is formed to be thin, processing is easier. In the present embodiment, the shoulder 6
The thickness B of 1e is the thickness from the end face on the neck 61c side of the main body 61a 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 main body. In the seat valve having such a shape, for example, the lower end face and the bottom face 2 of FIG.
In a configuration in which an elastic member such as a seal member is provided between the shoulder portion 5a and the neck portion 5a, the present embodiment is applicable if the thickness B of the shoulder is smaller than the thickness A of the neck. The same effect as described above can be obtained.

Embodiment 4 FIG. FIG. 10 is a sectional view showing another example of the check valve of the present invention. In FIG. 10, the valve element of the present embodiment is a poppet type valve element 42. The valve element 42 has a substantially conical shape, and the conical seat surface 42a
Is in contact with the seat 41 d of the seat valve 41. Other configurations are the same as those of the first embodiment. With the check valve configured as described above, the same effect as in the first embodiment can be obtained.

Embodiment 5 FIG. FIG. 11 is a sectional view showing another example of the check valve of the present invention. In FIG. 11, a seat valve 71 according to the present embodiment has a substantially cylindrical main body 71a having a passage hole 71b formed along a central axis, and an end face on one side of the main body 71a extending along the outer periphery of the passage hole 71b. And a neck 71c standing upright over the entire circumference. The inner circumference of the tip of the neck 71c is approximately 45
The seat 71d is formed on a slope having a degree. A part of the outer peripheral portion of the neck 71d, which is the back side of the seat 71d, is partially annularly thinned to form a thin portion 71g. The seat valve 71 has the main body 71 a pressed into the concave portion 25 and is fixed to the bottom surface 25 a of the concave portion 25. Other configurations are the same as those of the first embodiment.

In the check valve configured as described above,
Since the main body 71a is press-fitted into the concave portion 25, the seat valve 71 is deformed by receiving a pressing force in the radial direction, but the outer peripheral portion of the neck portion 71d is partially annularly thinned to form a thin portion 71.
Since g is formed, the amount of deformation of the seat 71d is small. Therefore, the same effect as in the first embodiment can be obtained.

[0047]

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 recess, the upstream of the fluid passage communicates with the bottom surface of the recess, and the fluid passage on the other side. A storage space through which the downstream portion communicates, a cylindrical body having a passage hole formed along the central axis and having a shoulder at an outer peripheral portion of one end surface, and a cylindrical body having a shoulder at the body. A neck formed at the center of the end face along the outer periphery of the passage hole and formed with a seat at the tip end, and the end face opposite to the neck of the main body is disposed in contact with the bottom face of the recess. A seat valve, a valve element housed in the storage space and abutting the seat surface against the seat, an elastic member contracted in the storage space and urging the valve element in the seat direction, and a center axis direction of the main body. A fixing member for applying a load to the shoulder to fix the seat valve to the bottom of the concave portion In thin-walled portion is formed between the load point and the seat of the shoulder. Therefore, the deformation amount of the seat is smaller than the conventional deformation amount. Thereby,
The sealing performance between the valve body and the seat is improved. In addition, it becomes possible to fix the seat valve with a stronger pressing force,
Further, it can be used for a high-pressure fuel passage. further,
Since the bias of the pressing force when fixing the seat valve can be tolerated to some extent, the processing accuracy of the seat valve and the fixing member can be eased.

According to a second aspect of the present invention, the check valve is provided in the middle of the fluid passage, and at least one side is a cylindrical recess, the bottom of the recess communicates with the upstream portion of the fluid passage, and the other side includes the downstream portion of the fluid passage. It is stored in the storage space that communicates with the storage space,
A passage hole is formed along the central axis, and a cylindrical main body having a shoulder at an outer peripheral portion of one end face and a central portion of the end surface at a side having a shoulder portion of the main body are erected along the outer periphery of the passage hole. A seat valve having a neck with a seat seat formed at a front end thereof, a seat valve housed by being press-fitted into the recess so that an end surface opposite to the neck of the main body abuts against the bottom of the recess, and housed in the housing space. In a check valve having a valve body that abuts a seat surface on a seat seat and an elastic member that is contracted in a storage space and urges the valve body in a seat seat direction, a thin portion is provided between the seat seat and the main body. Are formed. Therefore, the amount of deformation of the main body caused by being press-fitted into the concave portion is difficult to be transmitted to the seat, and the amount of deformation of the seat is smaller than the conventional amount of deformation. And the sealing performance of the valve body and the seat is improved.

In the check valve according to the third aspect, the thin portion is
The outer peripheral portion of the neck portion is formed by annularly removing the thickness. Therefore, a thin portion can be easily formed.

In the check valve according to the fourth aspect, the thin portion is
The base of the shoulder is formed by removing the wall in an annular shape. Therefore, the thin portion can be more easily created.

In the check valve of the fifth aspect, the thin portion is
The shoulder is formed to be thinner than the neck. Therefore, the thin portion can be more easily created.

In the check valve of the sixth aspect, the valve body is a ball type. Therefore, the sealing performance can be improved in the check valve having the ball type valve element.

In the check valve according to the seventh aspect, the valve body is a poppet type. Therefore, the sealability of the check valve having the poppet type valve body can be improved.

In the seat valve according to the eighth aspect, a cylindrical main body having a passage hole formed along the central axis and having a shoulder at an outer peripheral portion of one end face, and a cylindrical end having a shoulder portion of the main body. A central portion is provided along the outer periphery of the passage hole and has a neck portion with a seat seat formed at a distal end portion, and is provided in the middle of the fluid passage, at least one side is a cylindrical concave portion, and a bottom surface of the concave portion is provided. In the storage space where the upstream part of the fluid passage communicates with the downstream part of the fluid passage on the other side, the end face opposite to the neck of the main body abuts against the bottom surface of the recess, and the shoulder is pressed and fixed in the central axis direction. In the seat valve, a thin portion is formed between the load point on the shoulder and the seat. Therefore, the deformation amount of the seat is smaller than the conventional deformation amount. Thereby,
The sealing performance between the valve body and the seat is improved. In addition, it becomes possible to fix the seat valve with a stronger pressing force,
Further, it can be used for a check valve arranged in a high-pressure fuel passage. Further, since the bias of the pressing force when fixing the seat valve can be allowed to some extent, the processing accuracy of the seat valve can be reduced.

In the seat valve according to the ninth aspect, a cylindrical main body having a passage hole formed along the central axis and having a shoulder at an outer peripheral portion of one end face, and a cylindrical end face having a shoulder portion of the main body. A central portion is provided along the outer periphery of the passage hole and has a neck portion with a seat seat formed at a distal end portion, and is provided in the middle of the fluid passage, at least one side is a cylindrical concave portion, and a bottom surface of the concave portion is provided. A seat valve in which a main body is press-fitted into a concave portion so that an end surface opposite to a neck portion of the main body abuts against a bottom surface of the concave portion in a storage space in which an upstream portion of the fluid passage communicates with a downstream portion of the fluid passage on the other side. A thin portion is formed between the seat and the main body. Therefore, the amount of deformation of the main body caused by being press-fitted into the recess becomes difficult to be transmitted to the seat, and the amount of deformation of the seat decreases, so that the sealing performance between the valve body and the seat is improved.

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

In the seat valve according to the eleventh aspect, the thin portion is formed by removing a base portion of the shoulder portion in an annular shape. Therefore, the thin portion can be more easily created.

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

[Brief description of the drawings]

FIG. 1 is a sectional view of a check valve of the present invention.

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

FIG. 3 is a cross-sectional view showing how a 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 sectional view of a seat valve.

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

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

FIG. 11 is a 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 sectional view showing details of a conventional check valve.

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

FIG. 15 is a sectional view showing a state of deformation of a conventional seat valve.

[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 body, 41c, 51c, 61c, 71c neck, 41g,
51g, 71g thin portion, 42 valve body, 31 cap (fixing member), 32 balls (valve member), 33 spring (elastic member), 61e shoulder (thin portion).

Claims (12)

[Claims] A storage space provided in the middle of the fluid passage, at least one side of which is a cylindrical recess, an upstream portion of the fluid passage communicating with a bottom surface of the recess, and a downstream portion of the fluid passage communicating with the other side. A cylindrical main body that is housed in the housing space, has a passage hole formed along the central axis, and has a shoulder at an outer peripheral portion of one end face; and a central portion of the end face of the main body having the shoulder. And a neck with a seat seat formed at a tip end thereof along the outer periphery of the passage hole, and an end surface of the main body opposite to the neck is disposed in contact with a bottom surface of the concave portion. A seat valve, a valve element housed in the storage space for bringing a seat surface into contact with the seat seat, an elastic member contracted in the storage space to urge the valve body in the seat seat direction; A load is applied to the shoulder in the direction of the center axis of the main body, and the seat valve is moved to the bottom of the recess. A check valve in a check valve and a fixing member for fixing, characterized in that the thin portion is formed between the load point and the seat of the shoulder portion. 2. A storage space provided in the middle of the fluid passage, at least one side of which is a cylindrical recess, the bottom of the recess communicates with the upstream portion of the fluid passage, and the other side communicates with the downstream portion of the fluid passage. A cylindrical main body that is housed in the housing space, has a passage hole formed along the central axis, and has a shoulder at an outer peripheral portion of one end face; and a central portion of the end face of the main body having the shoulder. A neck with a seat seat formed at a front end thereof along the outer periphery of the passage hole, and an end face of the main body opposite to the neck is formed in the recess so as to abut against a bottom of the recess. A seat valve press-fitted and housed, a valve body housed in the storage space for bringing a seat surface into contact with the seat seat, and a valve body shrunk in the storage space to bias the valve body in the seat seat direction. A check valve having an elastic member that performs A check valve, wherein a thin portion is formed. 3. The thin portion is formed by removing an outer peripheral portion of the neck portion in an annular shape.
Or the check valve according to 2. 4. The thin portion is formed by removing a root portion of the shoulder portion in an annular shape.
Or the check valve according to 2. 5. The check valve according to claim 1, wherein the thin portion is formed such that the thickness of the shoulder is smaller than that of the neck. 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 body having a passage hole formed along a central axis and having a shoulder at an outer peripheral portion of one end surface, and a passage at a center of the end surface of the body having the shoulder portion. A neck portion having a seat portion formed at a tip end thereof along the outer periphery of the hole, provided in the middle of the fluid passage, wherein at least one side is a cylindrical concave portion, and the fluid passage is provided at a bottom surface of the concave portion. In the storage space through which the upstream portion communicates and the downstream portion of the fluid passage communicates with the other side,
A seat valve in which an end surface of the body opposite to the neck abuts against a bottom surface of the concave portion and the shoulder is pressed and fixed in a central axis direction, between the load point of the shoulder and the seat. A seat valve characterized in that a thin portion is formed in the seat valve. 9. A cylindrical main body having a passage hole formed along a central axis and having a shoulder at an outer peripheral portion of one end surface, and a passage at a central portion of the end surface of the main body having the shoulder portion. A neck portion having a seat portion formed at a tip end thereof along the outer periphery of the hole, provided in the middle of the fluid passage, wherein at least one side is a cylindrical concave portion, and the fluid passage is provided at a bottom surface of the concave portion. In the storage space through which the upstream portion communicates and the downstream portion of the fluid passage communicates with the other side,
A seat valve in which the main body is press-fitted into the concave portion such that an end surface of the main body opposite to the neck abuts against a bottom surface of the concave portion, wherein a thin portion is formed between the seat and the main body. A seat valve characterized by the above-mentioned. 10. The seat valve according to claim 8, wherein the thin portion is formed by removing an outer peripheral portion of the neck portion in an annular shape. 11. The seat valve according to claim 8, wherein the thin portion is formed by removing a root portion of the shoulder portion in an annular shape. 12. The seat valve according to claim 8, wherein the thin portion is formed such that a thickness of the shoulder is smaller than a thickness of the neck.