JP2022121870A - pressure regulating valve - Google Patents

Abstract

To suppress deterioration in sealing performance of a valve member when a valve is closed.SOLUTION: A pressure regulating valve includes a sub-valve body 50 that has a planar sub-seal surface 52 and is movable in a direction orthogonal to the sub-seal surface 52, and a sub-valve seat 40 having a planar seat surface 41 which the sub-seal surface 52 is brought in contact with and is separated from. An outer peripheral end edge portion 53 of the sub-seal surface 52 is opposed to the sub-seat surface 41. The sub-valve body 50 and the sub-valve seat 40 are formed of a plastic material. The hardness of the sub-valve body 50 is less than the hardness of the sub-valve seat 40.SELECTED DRAWING: Figure 4

Description

The technology disclosed in this specification relates to a pressure regulating valve.

A conventional example of a pressure regulating valve will be described. FIG. 13 is a schematic diagram showing a main part of the pressure regulating valve. As shown in FIG. 13, a pressure regulating valve 1 includes a valve member 2 having a flat sealing surface 3 and movable in a direction orthogonal to the sealing surface 3 (vertical direction in FIG. 13), and a sealing surface 3. and a sheet member 6 having planar sheet surfaces 7 that come into contact with each other. An outer peripheral edge portion 4 of the seal surface 3 faces the seat surface 7 . The valve member 2 and the seat member 6 are made of a plastic material such as a metal material. The hardness of the valve member 2 and the seat member 6 are the same. 13, the open state of the valve member 2 is indicated by a solid line 2, and the closed state (sealed state) thereof is indicated by a chain double-dashed line 2. As shown in FIG.

Further, the solenoid valve described in Patent Document 1 has a metal seat member and a metal valve member provided so as to be able to contact and separate from the seat member. The sheet member has a convexly curved sheet surface. The valve member has a concave annular groove that conforms to the seat surface. The seat surface is formed with hardness higher than that of the annular groove. The annular groove is formed by pressing the valve member against the seat member to plastically deform the valve member.

JP 2020-51475 A

In the conventional example, when the valve member 2 is closed, the valve member 2 may be closed in a tilted state (see FIG. 14). In this case, as shown in FIG. 15, the seal surface 3 of the valve member 2 is in partial contact with the seat surface 7 of the seat member 6, that is, the outer peripheral edge portion 4 of the seal surface 3 abuts (collides). Then, since the valve member 2 and the seat member 6 have the same hardness, the seat surface 7 may be plastically deformed to form a primary depression 7a, and the seat surface 7 may be plastically deformed to form a raised portion 7b. When the valve member is closed (sealed), as shown in FIG. 16, the raised portion 7b abuts against the seal surface 3, so that the seal surface 3 may be plastically deformed to form a secondary recess 3a. be. Due to such scratches on the seat surface 7 and the seal surface 3, there is a possibility that the sealing performance of the valve member 2 when the valve is closed may deteriorate.

In addition, according to Patent Document 1, burrs generated when an annular groove is formed in a valve member by plastic deformation are sandwiched between the seat surface and the sealing surface, thereby degrading the sealing performance of the valve member when the valve is closed. there is a risk of

The problem to be solved by the technology disclosed in this specification is to suppress the deterioration of the sealing performance of the valve member when the valve is closed.

In order to solve the above problems, the technique disclosed in this specification takes the following measures.

The first means comprises a valve member having a planar seal surface and movable in a direction orthogonal to the seal surface, and a seat member having a planar seat surface with which the seal surface contacts and separates. wherein an outer peripheral edge of one of the sealing surface and the seat surface faces the other surface, wherein the valve member and the seat member are made of a plastic material, In the pressure regulating valve, the hardness of the one member having the one surface is lower than the hardness of the other member having the other surface.

According to the first means, when the valve member closes in a state in which the valve member is inclined relative to the seat member, one surface abuts against the other surface, that is, the outer peripheral edge of the sealing surface abuts. Then, due to the difference in hardness between the seat member and the valve member, burrs may occur due to plastic deformation of the outer peripheral edge of one surface. However, when the valve member is closed (at the time of sealing), the one surface and the other surface can come into surface contact without the burr coming into contact with the other surface. Therefore, it is possible to suppress the deterioration of the sealing performance of the valve member when the valve is closed.

A second means is the pressure regulating valve of the first means, wherein the valve member and/or the seat member can be rocked by a rocking mechanism.

According to the second means, even if the valve member and/or the seat member are swingable by the swing mechanism, it is possible to suppress deterioration of the sealing performance of the valve member when the valve is closed.

A third means is the pressure regulating valve of the first or second means, wherein the one surface is annularly formed on the one member.

According to the third means, even if the valve member is eccentric with respect to the seat member, the seal width (width in the radial direction) of one surface with respect to the other surface can be made constant over the circumferential direction. Therefore, one surface is in surface contact with the other surface over the entire circumference with a constant surface pressure, so that the sealing performance of the valve member when the valve is closed can be improved.

A fourth means is the pressure regulating valve of the third means, wherein said other member has a recess adjacent to the outside of said other surface.

According to the fourth means, even if the burr formed on the outer peripheral edge of one surface falls off, the burr can be released from the other surface to the recess. Therefore, burrs can be suppressed from being caught between the one surface and the other surface.

A fifth means is the pressure regulating valve of any one of the first to fourth means, wherein the plastic material of the valve member and the seat member is a metal material.

According to the fifth means, in a pressure regulating valve in which the plastic material of the valve member and the seat member is a metal material, it is possible to suppress deterioration in sealing performance when the valve member is closed.

A sixth means is the pressure regulating valve of any one of the first to fourth means, wherein the plastic material of the valve member and the seat member is a resin material.

According to the sixth means, it is possible to suppress deterioration of sealing performance when the valve member is closed in the pressure regulating valve in which the plastic material of the valve member and the seat member is a resin material.

According to the technique disclosed in this specification, it is possible to suppress the deterioration of the sealing performance of the valve member when the valve is closed.

1 is a configuration diagram showing an outline of a fuel supply device according to Embodiment 1; FIG. It is a sectional view showing a pressure control valve. FIG. 4 is a cross-sectional view showing the valve mechanism of the pressure regulating valve in the first state; FIG. 5 is a cross-sectional view showing the valve mechanism of the pressure regulating valve in a second state; FIG. 5 is a cross-sectional view showing the valve mechanism of the pressure regulating valve in a third state; It is a schematic diagram which shows the state which the sub-valve body inclined. FIG. 5 is a schematic diagram showing a state in which the sealing surface is in one-sided contact with the seat surface; It is a schematic diagram which shows a burr. It is a schematic diagram which shows a sealing state. FIG. 7 is a cross-sectional view showing a sub-valve seat according to Embodiment 2; FIG. 11 is a cross-sectional view showing a sub-valve seat according to Embodiment 3; FIG. 11 is a cross-sectional view showing a sub-valve seat according to Embodiment 4; FIG. 3 is a schematic diagram showing a main part of a pressure regulating valve according to a conventional example; FIG. 5 is a schematic diagram showing a state in which the sealing surface is in one-sided contact with the seat surface; FIG. 4 is a schematic diagram showing a deformed state of the seat surface; It is a schematic diagram which shows a sealing state.

[Embodiment 1]
Hereinafter, embodiments for implementing the technology disclosed in this specification will be described with reference to the drawings. A pressure regulating valve according to an embodiment is used in a fuel supply device for supplying fuel in a fuel tank to an engine, which is an internal combustion engine, in a vehicle such as an automobile.

(Overview of fuel supply device)
The outline of the fuel supply system will be explained. FIG. 1 is a configuration diagram showing an outline of a fuel supply system. As shown in FIG. 1 , the fuel supply system 10 includes a fuel pump 12 installed within a fuel tank 11 . The fuel pump 12 is a motor-integrated electric fuel pump. The fuel pump 12 draws in and pressurizes the fuel stored in the fuel tank 11 , and then supplies the fuel to the delivery pipe 16 of the engine 15 through the fuel supply passage 13 . The delivery pipe 16 distributes the fuel supplied from the fuel supply passage 13 to the multiple injectors 17 . Each injector 17 injects fuel into an intake passage or combustion chamber of the engine 15 .

A check valve 14 is interposed in the middle of the fuel supply passage 13 to allow the flow of fuel in the supply direction and prevent the reverse flow. The check valve 14 opens when the fuel pump 12 is operating to allow fuel to flow from the fuel pump 12 to the engine 15 side, and closes when the fuel pump 12 is stopped to prevent backflow of fuel. A passage portion of the fuel supply passage 13 upstream of the check valve 14 is referred to as an upstream supply passage portion 13a, and a passage portion of the fuel supply passage 13 downstream of the check valve 14 is referred to as a downstream supply passage portion 13b.

A fuel discharge passage portion 13c communicating with the inside of the fuel tank 11 is branched from the upstream supply passage portion 13a. A relief valve 19 is provided in the fuel discharge passage portion 13c. The relief valve 19 is normally closed, and opens when the pressure of the fuel in the upstream supply passage portion 13a becomes higher than a predetermined pressure, that is, the valve opening pressure Pv. is discharged into the fuel tank 11 from the fuel discharge passage portion 13c.

A pressure regulating valve 20 is connected to the middle of the upstream supply passage portion 13a via an upstream branch passage 18a. A pressure regulating valve 20 is connected to the middle of the downstream supply passage portion 13b via a downstream branch passage 18b. The pressure regulating valve 20 includes a fuel pressure regulating valve mechanism V1 and a residual pressure holding valve mechanism V2. The fuel pressure adjusting valve mechanism V1 is a mechanism that adjusts the pressure of the fuel flowing through the fuel supply passage 13, ie, the fuel supplied to the engine 15, to a predetermined pressure when the fuel pump 12 is in operation. Further, the residual pressure holding valve mechanism V2 maintains a predetermined residual pressure of fuel in the downstream supply passage portion 13b including the downstream branch passage 18b when the fuel supply is stopped, that is, when the fuel pump 12 is stopped (during non-operation). It is a mechanism that maintains (adjusts) the pressure of

(Pressure regulating valve 20)
The pressure regulating valve 20 will be explained. FIG. 2 is a cross-sectional view showing a pressure regulating valve. For convenience of explanation, the orientation of the pressure regulating valve 20 is determined based on FIG. 2, but the arrangement direction of the pressure regulating valve 20 is not specified.

As shown in FIG. 2, the pressure regulating valve 20 has a casing 23 forming a substantially cylindrical inner space. The casing 23 is formed by connecting a first case member 24 forming its lower half and a second case member 25 forming its upper half. A flange portion 26 that protrudes radially outward in an annular shape is formed at the joint portion between the two case members 24 and 25 . The casing 23 is made of metal.

The first case member 24 is formed in a stepped cylindrical shape having an upper large-diameter cylindrical portion 24a, a middle-diameter cylindrical portion 24b, a lower small-diameter cylindrical portion 24c, an upper stepped portion 24d, and a lower stepped portion 24e. It is A plurality of first fuel inlets 27 are formed in the upper stepped portion 24d. A second fuel inlet 28 is formed at the opening end (lower end) of the small-diameter cylindrical portion 24c. The second case member 25 is formed in a substantially cylindrical shape that closes the top opening. A fuel outlet 29 is formed in the upper surface of the second case member 25 .

Between the first case member 24 and the second case member 25, an outer peripheral portion of a diaphragm 31 having a flexible annular plate shape is sandwiched. The diaphragm 31 divides the internal space of the casing 23 into a main pressure regulating chamber 32 on the first case member 24 side and a back pressure chamber 33 on the second case member 25 side.

A sub valve seat 40 is provided in the main pressure regulating chamber 32 . The sub valve seat 40 is formed in a T-shaped hollow cylindrical shape having a columnar portion 40a and a flange portion 40b. The columnar portion 40a is press-fitted into the medium-diameter cylindrical portion 24b of the first case member 24. As shown in FIG. The internal space of the sub valve seat 40 is called a sub pressure regulating chamber 43 .

As shown in FIG. 3, the sub-valve seat 40 has a planar sub-seat surface 41 perpendicular to the axis on its upper surface. The secondary valve seat 40 is made of metal, ie, plastic material. The plastic material of the sub valve seat 40 is, for example, a metal material such as SUS303.

A sub-valve body 50 is arranged substantially concentrically on the sub-valve seat 40 . The sub-valve body 50 includes a disk-shaped substrate portion 50a, a short cylindrical sub-valve portion 51 projecting from the outer periphery of the bottom surface of the substrate portion 50a, and a spherical main portion formed at the center of the top surface of the substrate portion 50a. and a valve seat portion 58 . The sub-valve portion 51 can be seated on and separated from the sub-valve seat 40 .

The sub-valve portion 51 is formed to have an inverted trapezoidal cross section. The annular lower surface of the sub-valve portion 51 serves as a planar sub-seal surface 52 perpendicular to the axis. The sub-seal surface 52 contacts and separates from the sub-seat surface 41 of the sub-valve seat 40 . The sub-valve body 50 is made of metal, that is, made of a plastic material. The plastic material of the sub-valve body 50 is, for example, a metal material such as SUS304. That is, the hardness of the sub-valve body 50 is lower than the hardness of the sub-valve seat 40 . Also, the outer diameter of the secondary seal surface 52 is smaller than the outer diameter of the secondary seat surface 41 . Therefore, an outer peripheral edge portion 53 , which is a corner portion on the outer peripheral side of the sub seal surface 52 , faces the sub seat surface 41 .

The surface of the main valve seat portion 58 is a spherical main seat surface 59 centered on a point p located on the axis of the sub valve body 50 . The sub-valve seat 40 corresponds to the "seat member" and the "other member" referred to in this specification. The sub-seat surface 41 corresponds to the "seat surface" and the "other surface" referred to in this specification. The sub-valve body 50 corresponds to the "valve member" and "one member" referred to in this specification. The sub-sealing surface 52 corresponds to the "sealing surface" and "one surface" referred to in this specification.

A cap-shaped retainer 35 that covers the sub-valve body 50 is attached to the sub-valve seat 40 . A first opening 35a is formed in the center of the upper surface of the retainer 35. As shown in FIG. Further, a plurality of second opening holes 35b are formed in the outer peripheral portion or side surface portion of the upper surface portion of the retainer 35. As shown in FIG. The main valve seat portion 58 of the sub-valve body 50 is exposed through the first opening 35 a of the retainer 35 . Thus, the sub-valve body 50 is movably and swingably mounted on the sub-valve seat 40 . Further, the amount of movement of the sub-valve body 50 in the axial direction (vertical direction) is regulated by the sub-valve seat 40 and the retainer 35 . The sub-valve seat 40 and the retainer 35 constitute a rocking mechanism 42 that allows the sub-valve body 50 to rock.

As shown in FIG. 2 , a sub-valve spring 37 that biases the sub-valve body 50 in the opening direction (upward) is arranged in the sub-pressure regulating chamber 43 of the sub-valve seat 40 . The sub-valve seat 40, the sub-valve body 50 and the sub-valve spring 37 constitute a residual pressure holding valve mechanism V2.

As shown in FIG. 3 , a main valve body 60 is provided on the inner peripheral portion of the diaphragm 31 . The main valve body 60 is coupled to an annular plate-shaped holding member 65 arranged on the upper surface side of the diaphragm 31 . A diaphragm 31 is held between the main valve body 60 and the holding member 65 . The main valve body 60 has a communication hole 61 that penetrates in the axial direction (vertical direction). A cylindrical main valve portion 62 that can be seated on and separated from the main valve seat portion 58 of the sub valve body 50 is concentrically formed at the lower end of the main valve body 60 . The inner peripheral surface of the main valve portion 62 is formed with a tapered hole-shaped main sealing surface 63 whose diameter gradually increases downward from the upper end side. The main seal surface 63 contacts and separates from the main seat surface 59 of the main valve seat portion 58 of the sub valve body 50 .

As shown in FIG. 2, a main valve spring 66 made of a coil spring is interposed between the facing surfaces of the second case member 25 and the clamping member 65 . The main valve spring 66 biases the main valve body 60 and the sub-valve body 50 in the closing direction (downward). The main valve spring 66 closes the main valve body 60 , that is, the main valve portion 62 is seated on the main valve seat portion 58 of the sub-valve body 50 , and closes the sub-valve body 50 , that is, the sub-valve portion 51 is sub-valve. It is kept seated on the valve seat 40 . The main valve body 60, the main valve seat portion 58, and the main valve spring 66 constitute a fuel pressure adjusting valve mechanism V1. The main valve spring 66 corresponds to a "biasing member" that biases the sub-valve body 50 in the closing direction. Further, the sub-valve body 50 is a “lift valve” biased toward the closing direction, ie, the sub-valve seat 40 by the main valve spring 66 .

An alignment mechanism 64 is configured by the main valve seat portion 58 and the main valve portion 62 . That is, the center of the main valve seat portion 58 of the sub valve body 50 is aligned with the axis of the main valve body 60 by bringing the main sealing surface 63 of the valve portion 62 into contact with the main seat surface 59 of the main valve seat portion 58 . be done. Subsequently, when the sub-valve body 50 abuts (seats) on the main valve part 62 in an inclined state (see FIG. 7), after the sub-valve part 51 of the sub-valve body 50 makes a one-sided contact with the sub-valve seat 40, , the main seat surface 59 of the main valve seat portion 58 slides against the main seal surface 63 of the main valve portion 62 . As a result, the axis of the sub-valve body 50 is aligned with the axis of the main valve body 60, and the sub-seal surface 52 of the sub-valve portion 51 is in surface contact with the sub-seat surface 41 of the sub-valve seat 40. (see FIG. 3).

As shown in FIG. 2 , a first filter 67 for filtering fuel flowing into the main pressure regulating chamber 32 from the first fuel inlet 27 is arranged inside the large-diameter cylindrical portion 24 a of the first case member 24 . A first filter spring 68 consisting of a wave washer is interposed between the first filter 67 and the sub valve seat 40 . The first filter spring 68 presses the first filter 67 against the upper stepped portion 24 d of the first case member 24 .

A second filter 69 for filtering the fuel flowing into the auxiliary pressure regulating chamber 43 from the second fuel inlet 28 is arranged inside the medium-diameter cylindrical portion 24 b of the first case member 24 . A secondary valve spring 37 made of a coil spring is interposed between the second filter 69 and the secondary valve body 50 . The sub valve spring 37 presses the second filter 69 against the lower stepped portion 24 e of the first case member 24 while urging the sub valve body 50 in the opening direction (upward). The biasing force of the secondary valve spring 37 is smaller than the biasing force of the main valve spring 66 . The sub-valve spring 37 also serves as a second filter spring.

(Installation of pressure regulating valve 20 for fuel supply device 10)
As shown in FIG. 1 , the pressure regulating valve 20 is connected to a branch pipe 70 that forms the upstream branch passage 18 a and the downstream branch passage 18 b in the fuel supply system 10 . The branch pipe 70 has an inner pipe portion 71 and an outer pipe portion 72 forming an inner and outer double ring. An upstream branch passage 18 a is formed between the outer tube portion 72 and the inner tube portion 71 . A downstream branch passage 18 b is formed in the inner pipe portion 71 . The branch pipe 70 is arranged inside the fuel tank 11 .

A distal end portion (lower end portion in FIG. 2) of the first case member 24 is inserted into the inner tube portion 71 . A first O-ring 73 is interposed between the small-diameter cylindrical portion 24c (see FIG. 2) of the first case member 24 and the inner tube portion 71 for sealing therebetween. The base end portion (the end portion on the flange portion 26 side) of the first case member 24 is inserted into the outer tube portion 72 . A second O-ring 74 is interposed between the large-diameter cylindrical portion 24a of the first case member 24 and the outer tube portion 72 for sealing therebetween. A spacer 75 is interposed between the flange portion 26 of the casing 23 and the second O-ring 74 .

A cap 77 for retaining the pressure regulating valve 20 is attached to the outer tube portion 72 by snap fitting. The cap 77 is formed in a substantially cylindrical shape that closes the top opening. An opening hole 77 a is formed in the upper surface of the cap 77 . The flange portion 26 of the casing 23 is sandwiched between the outer tube portion 72 and the cap 77 .

(Action of pressure regulating valve 20)
Normally, the pressure regulating valve 20, as shown in FIG. The sub-valve portion 51 of the body 50 is held in a state of being seated on the sub-valve seat 40 . This state, ie, the state in which both the main valve body 60 and the sub-valve body 50 are closed, is called a "first state."

(when the fuel pump 12 is activated)
In FIG. 1 , the fuel that has flowed into the upstream branch passage 18 a due to the operation of the fuel pump 12 flows into the main pressure regulating chamber 32 through the first fuel inlet 27 of the pressure regulating valve 20 . On the other hand, the fuel that has flowed into the downstream branch passage 18 b flows from the second fuel inlet 28 of the pressure regulating valve 20 into the auxiliary pressure regulating chamber 43 .

When the pressure of the fuel in the main pressure regulating chamber 32 exceeds the valve opening pressure P1 of the main valve body 60, the main valve body 60 is pushed up against the urging force of the main valve spring 66, and the sub valve spring 37 is applied. The sub valve body 50 is pushed up together with the main valve body 60 by the force and the fuel pressure in the sub pressure regulating chamber 43 (the same pressure as the fuel pressure in the main pressure regulating chamber 32). As a result, as shown in FIG. 4, the sub-valve portion 51 of the sub-valve body 50 is separated from the sub-valve seat 40, and the substrate portion 50a contacts the upper surface portion of the retainer 35. As shown in FIG. This state, ie, the state in which the main valve body 60 is closed and the sub-valve body 50 is opened, is referred to as a "second state." In the second state, the main pressure regulating chamber 32 and the sub pressure regulating chamber 43 communicate with each other through the second opening 35b of the retainer 35 .

Further, as shown in FIG. 5 , when the main valve body 60 is pushed up against the bias of the main valve spring 66 , the main valve portion 62 of the main valve body 60 is pushed up to the main valve seat portion 58 of the sub-valve body 50 . leave from This state, ie, the state in which both the main valve body 60 and the sub-valve body 50 are open, is called a "third state." In the third state, fuel in the main pressure regulating chamber 32 is discharged as surplus fuel through the communication hole 61 of the main valve body 60, the back pressure chamber 33, and the fuel outlet 29 through the opening hole 77a of the cap 77 (see FIG. 1). The valve opening pressure P1 of the main valve body 60 is lower than the valve opening pressure Pv of the relief valve 19 (see FIG. 1).

When the fuel pressure in the main pressure regulating chamber 32 becomes equal to or lower than the valve opening pressure P1, the main valve portion 62 of the main valve body 60 is seated on the main valve seat portion 58 of the sub valve body 50 due to the urging of the main valve spring 66. 2 states (see FIG. 4). Further, the sub-valve portion 51 of the sub-valve body 50 is in the first state seated on the sub-valve seat 40 (see FIG. 3).

(When the fuel pump 12 is stopped)
In FIG. 1 , when the fuel pump 12 is stopped, the fuel supply passage 13 downstream of the fuel supply passage 13 is closed by closing the valve bodies 50 and 60 of the pressure regulating valve 20, closing the injectors 17, and closing the check valve 14. A residual fuel pressure is maintained in the downstream supply passage portion 13b including the side branch passage 18b. In this state, for example, the pressure of the fuel in the downstream supply passage portion 13b including the downstream branch passage 18b may increase due to the heat generated by the engine 15 or the like. Then, the pressure of the fuel in the sub pressure regulating chamber 43 also increases.

When the fuel pressure in the sub-pressure adjusting chamber 43 exceeds the valve opening pressure P2 of the sub-valve body 50, the sub-valve portion 51 of the sub-valve body 50 moves away from the sub-valve seat 40 against the urging force of the main valve spring 66. The second state of leaving the seat is established (see FIG. 4). In this state, the fuel in the auxiliary pressure regulating chamber 43 flows into the main pressure regulating chamber 32 as surplus fuel through the second opening 35b (see FIG. 3) of the retainer 35, and then branches off from the first fuel inlet 27 on the upstream side. It is discharged to passage 18a. The fuel is discharged from the upstream branch passage 18a into the fuel tank 11 through the upstream supply passage portion 13a and the fuel pump 12 (see FIG. 1). The valve opening pressure P2 of the sub valve body 50 is higher than the valve opening pressure P1 of the main valve body 60 and lower than the relief valve 19 opening pressure Pv.

When the pressure of the fuel in the sub pressure regulating chamber 43 becomes equal to or lower than the valve opening pressure P2, the main valve spring 66 biases the sub valve portion 51 of the sub valve body 50 into the first state in which it is seated on the sub valve seat 40 ( See Figure 3).

(Advantages of Embodiment 1)
According to this embodiment, when the sub-valve body 50 closes, the valve may close in a state in which the sub-valve body 50 is tilted with respect to the sub-valve seat 40 (see FIG. 6). At this time, the sub-sealing surface 52 makes a one-sided contact with the sub-sealing surface 41, that is, the outer peripheral edge portion 53 of the sub-sealing surface 52 contacts (collides) (see FIG. 7). Then, due to the difference in hardness between the sub valve seat 40 and the sub valve body 50, a burr 54 is generated due to plastic deformation of the outer peripheral edge portion 53 of the sub seal surface 52 (see FIG. 8). The burr 54 is formed to protrude radially outward (to the left in FIG. 8) from the sub-seal surface 52 . Therefore, when the valve member is closed (sealed), the sub-seal surface 52 and the sub-seat surface 41 can come into surface contact without the burr 54 coming into contact with the sub-seat surface 41 (see FIG. 9). ). Therefore, it is possible to suppress the deterioration of the sealing performance of the sub-valve body 50 when the valve is closed. As a result, the reliability and durability of the pressure regulating valve 20 can be improved.

Further, even if the sub-valve body 50 is swingable by the swing mechanism 42, it is possible to suppress deterioration of the sealing performance of the sub-valve body 50 when the valve is closed.

Further, the sub-seal surface 52 is formed in an annular shape on the sub-valve body 50 . Therefore, even if the sub-valve body 50 is eccentric with respect to the sub-valve seat 40, the seal width (radial width) of the sub-seal surface 52 with respect to the sub-seat surface 41 can be made constant over the circumferential direction. Therefore, the sub-seal surface 52 comes into surface contact with the sub-seat surface 41 over the entire circumference with a constant surface pressure, thereby improving the sealing performance of the sub-valve body 50 when the valve is closed.

Further, it is possible to suppress deterioration of sealing performance when the sub-valve body 50 is closed in the pressure regulating valve 20 in which the plastic material of the sub-valve body 50 and the sub-valve seat 40 is a metal material.

Also, the sub-valve body 50 and the sub-valve seat 40 may be made of resin instead of metal. Specifically, the plastic material of the sub-valve seat 40 may be a resin material such as PI (polyimide), while the plastic material of the sub-valve body 50 may be a resin material such as PTFE (polytetrafluoroethylene). Also in this case, the hardness of the sub-valve body 50 is smaller than the hardness of the sub-valve seat 40 . As a result, it is possible to suppress the deterioration of the sealing performance of the pressure regulating valve 20 in which the plastic material of the sub-valve body 50 and the sub-valve seat 40 is a resin material when the sub-valve body 50 is closed.

[Embodiment 2]
Since this embodiment is obtained by modifying the sub-valve seat 40 of Embodiment 1, only the modified portions will be described, and overlapping descriptions will be omitted. FIG. 10 is a cross-sectional view showing the sub-valve seat. As shown in FIG. 10, a recess 45 is formed in the outer peripheral portion of the sub-seat surface 41 of the sub-valve seat 40 . That is, the secondary valve seat 40 has a recess 45 adjacent to the outside of the secondary seat surface 41 . The recess 45 has a stepped surface 45a with an L-shaped cross section.

According to the present embodiment, even if the burr 54 (see FIG. 9) generated on the outer peripheral edge portion 53 of the sub-sealing surface 52 falls off, the burr 54 can escape from the sub-seat surface 41 to the concave portion 45 . Therefore, it is possible to prevent the burr 54 from being caught between the sub-seal surface 52 and the sub-seat surface 41 .

[Embodiment 3]
Since this embodiment is obtained by modifying the sub-valve seat 40 of Embodiment 1, only the modified portions will be described, and overlapping descriptions will be omitted. FIG. 11 is a cross-sectional view showing the sub-valve seat. As shown in FIG. 11, a recess 47 is formed in the outer peripheral portion of the sub-seat surface 41 of the sub-valve seat 40 . That is, the secondary valve seat 40 has a recess 47 adjacent to the outside of the secondary seat surface 41 . The recess 47 has a tapered inclined surface 47a. This embodiment also provides the same functions and effects as those of the second embodiment.

[Embodiment 4]
Since the present embodiment is obtained by modifying the sub-valve portion 51 of the sub-valve body 50 of the first embodiment, the modified portion will be described, and redundant description will be omitted. FIG. 12 is a cross-sectional view showing the sub-valve seat. As shown in FIG. 12, the sub-valve portion 151 of this embodiment is formed in a short cylindrical shape on the entire lower surface of the substrate portion 150a of the sub-valve body 150. As shown in FIG. The sub-valve portion 151 can be seated on and separated from the sub-valve seat 40 . The lower surface of the sub-valve portion 151 serves as a planar sub-seal surface 152 perpendicular to the axis of the sub-valve body 150 . Also in this case, the outer peripheral edge portion 153 , which is the outer peripheral edge portion of the sub seal surface 152 , faces the sub seat surface 41 . The sub-valve body 150 corresponds to "valve member" and "one member" as used herein. The sub-sealing surface 152 corresponds to the "sealing surface" and "one surface" referred to in this specification.

[Other embodiments]
The technology disclosed in this specification is not limited to the above-described embodiments, and can be implemented in various other forms. For example, the technology disclosed in this specification may be applied not only to pressure regulating valves, but also to pressure regulating valves having a single valve mechanism, relief valves, check valves, and the like. Also, the technology disclosed in this specification may be applied to pressure control valves for fluids other than fuel. Further, when the outer peripheral edge portion of the seat surface faces the seal surface, the hardness of the seat member may be made smaller than the hardness of the seal member. Further, in the embodiment, the valve member is made swingable by the swinging mechanism, but the seat member may be swingable by the swinging mechanism, or the valve member and the seat member may be swingable by the swinging mechanism. good too. In addition to making the valve member and/or the seat member swingable via a swing mechanism, the valve member and/or the seat member may swing due to rattling caused by errors such as dimensional errors and assembly errors. . Also, the plastic material of one of the valve member and the seat member may be a metal material, and the other may be a resin material. Moreover, the cross-sectional shape of the sub-valve portion is not limited to an inverted trapezoidal shape, and may be a rectangular shape.

10 fuel supply device 15 engine (internal combustion engine)
20 Pressure regulating valve 40 Sub valve seat (seat member, other member)
41 sub-seat surface (seat surface, other surface)
42 rocking mechanism 45 recess 47 recess 50 auxiliary valve body (valve member, one member)
52 sub-seal surface (seal surface, one surface)
53 Outer peripheral edge portion 150 Sub-valve body (valve member, one member)
152 secondary seal surface (seal surface, one surface)
153 outer edge

Claims (6)

a valve member having a planar sealing surface and movable in a direction perpendicular to the sealing surface;
a sheet member having a planar sheet surface with which the sealing surface contacts and separates;
and
A pressure regulating valve in which an outer peripheral edge of one of the sealing surface and the seat surface faces the other surface,
The valve member and the seat member are made of a plastic material,
The pressure regulating valve, wherein the hardness of the one member having the one surface is lower than the hardness of the other member having the other surface. A pressure regulating valve according to claim 1,
A pressure regulating valve, wherein the valve member and/or the seat member can be rocked by a rocking mechanism. The pressure regulating valve according to claim 1 or 2,
The pressure regulating valve, wherein the one surface is annularly formed on the one member. A pressure regulating valve according to claim 3,
The pressure regulating valve, wherein the other member has a recess adjacent to the outside of the other surface. A pressure regulating valve according to any one of claims 1 to 4,
The pressure regulating valve, wherein the plastic material of the valve member and the seat member is a metal material. A pressure regulating valve according to any one of claims 1 to 4,
The pressure regulating valve, wherein the plastic material of the valve member and the seat member is a resin material.

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