JP2002266726A - Fuel feed pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the performance of a pump by stabilizing the position of a valve element and quickly and certainly seating the valve element to a seat portion, and to provide an inexpensive fuel feed pump, in a structure of a check valve as a discharge valve and a suction valve. SOLUTION: A support portion for supporting an elastic element is provided on the valve element, and regulating portion for regulating the amount of movement of the valve element when opening the valve is formed. The valve element is structured so as to move in the generally orthogonal direction to the moving direction of the valve element, thereby improving the reliability of the elastic element and the like. The valve element is held at a stable position in a passage, and stably seated at a valve seat to improve a sealing property of the regulating portion. The check valve having a simple structure is functioned as the suction valve or the discharge valve, thereby obtaining an inexpensive fuel feed pump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure fuel pump for supplying fuel to a fuel injection valve of an internal combustion engine at a high pressure, and more particularly to a check valve for controlling the intake and discharge of fuel.

[0002]

2. Description of the Related Art In FIG. 1 of Japanese Patent Application Laid-Open No. Hei 6-33848, a discharge valve 17 is disposed in an enlarged diameter portion of a supply guide hole 13 forming a spring chamber 21 and has a conical or planar shape. A valve closing member 23 having a sealing surface 25 is provided, which is pressed against a valve seat 29 formed on the connecting body 9 by a valve spring 27. Formed by a conical cross-sectional enlargement or a flat sealing surface of the feed-through hole 13 in the body 9 of the feed-through portion 31 opening into the pump working chamber 5;
In this case, the opening movement of the valve closing member 23 of the discharge valve 17 initiated by the compressed high-pressure fuel in the pump working chamber 5 may be limited to a specific value by the stopper sleeve 33 in the spring chamber 21. Has been described. (The numbers are those used in JP-A-6-33848.)

[0003]

In a conventional high-pressure fuel pump, a check valve provided in a discharge or suction passage has a holding member for holding the valve when the valve reciprocates in the passage. When the valve body vibrates due to the pressure pulsation of the fuel or the like, the holding member comes into contact with the passage wall, and the holding member may be damaged. In the worst case, the holding member and the spring may be damaged. Further, in the valve closed state, the seating state of the valve body on the seat portion deteriorates, and it becomes difficult to secure oil tightness.

As a means for solving this problem, a discharge valve described in Japanese Patent Application Laid-Open No. 6-33848 has a valve closing member having a conical or flat sealing surface, and this sealing surface is a valve spring. The valve closing member is opened and closed by a guide of a stopper sleeve. Therefore, in this conventional technique, when the valve body vibrates due to fuel pressure pulsation or the like and a force acts in a direction perpendicular to the moving direction of the valve body, the side between the valve closing member and the stopper sleeve is closed. Because of the sliding under the pressure, the reliability of the valve closing member and the stopper sleeve is problematic. Further, in the valve closed state, it is conceivable that the seating state of the valve body on the seat portion is deteriorated. Further, in order to ensure oil tightness of the seat portion of the valve body, the processing accuracy of the valve surface of the valve closing member, the valve seat, and the stopper sleeve guide hole must be increased, and as a result, it becomes expensive. There was a problem that it would.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to reduce the pressure drop of fuel flowing through a valve body, to improve the reliability of the valve body and the sealing of the valve. High-pressure fuel pump,
That is, it is to provide a fuel supply pump.

[0006]

According to the present invention, there is provided a high-pressure fuel pump comprising a suction passage for supplying fuel, a discharge passage for discharging fuel to an injection valve, and a pump chamber communicating with the suction passage and the discharge passage. A fuel supply pump comprising: a pump unit for increasing the pressure of fuel in the pump chamber; and a check valve in at least one of the suction passage and the discharge passage for regulating a flow direction of fuel to the pump chamber. The check valve includes a valve seat, a valve body that comes into contact with the valve seat, and an elastic body that urges the valve body toward the valve seat, and a support portion that supports the elastic body on the valve body. A regulating portion for regulating the movement amount of the valve element when the valve is opened, and the valve element is configured to be movable in a direction substantially perpendicular to the moving direction of the valve element.

Also, a suction passage for supplying fuel, a discharge passage for discharging fuel to the injection valve side, a pump chamber communicating with the suction passage and the discharge passage, and a pump unit for increasing the pressure of the fuel in the pump chamber. A fuel supply pump having a check valve for regulating a flow direction of fuel to a pump chamber in at least one of the suction passage and the discharge passage, wherein the check valve includes a valve seat and a valve seat. A valve element that is in contact with the valve body, and an elastic body that urges the valve body toward the valve seat; a support portion that supports the elastic body is provided on the valve body; The seats of the valve seats are disposed so as to overlap with each other, and the valve element is movable in a direction substantially perpendicular to the moving direction of the valve element to perform self-centering.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The features of the present invention described above will be further clarified by the following embodiments. An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a configuration of a fuel supply system using the present embodiment. 2 and 3 are cross-sectional views showing a check valve according to one embodiment of the present invention.

First, the configuration of a fuel supply system using a high-pressure fuel pump according to this embodiment will be described with reference to FIG. The pump casing 1 has a fuel intake passage 10, a discharge passage 1
1. A pump chamber 12 is formed. In the pump chamber 12, a plunger 2 as a pressurizing member is slidably provided. A valve body 5 and a valve body 6 are provided in the suction passage 10 and the discharge passage 11, respectively, and are held in one direction by springs 23 and 24, respectively, serving as check valves for restricting a fuel flow direction. . Further, an electromagnetic valve 90 is provided on the pump casing 1, and a rod 91 and a spring 92 are arranged on the electromagnetic valve 90. When the solenoid valve 90 is OFF, the rod 91 is biased by the spring 92 in a direction to open the valve body 5. Since the urging force of the spring 92 is larger than the urging force of the spring 23, when the solenoid valve 90 is OFF, the valve element 5 is in the open state as shown in FIG.

The fuel is guided from the tank 50 to the fuel inlet of the pump casing 1 by the low-pressure pump 51 while being regulated to a constant pressure by the pressure regulator 52.
Thereafter, the fuel is pressurized by the high-pressure fuel pump 7 and sent to the common rail 53 from the fuel discharge port. The common rail 53 includes an injector 54, a relief valve 55, a pressure sensor 5
6 is mounted. The injectors 54 are mounted according to the number of cylinders of the engine, and inject fuel according to a signal from the control unit 57. Further, the relief valve 55 opens when the pressure in the common rail 53 exceeds a predetermined value, thereby preventing damage to the piping system.

A lifter 3 provided at the lower end of the plunger 2
Is pressed against the cam 100 by the spring 4. The plunger 2 reciprocates by a cam 100 rotated by an engine camshaft or the like to change the volume in the pump chamber 12.

The contact portion 82 of the regulating portion 25 of the valve body 6 has a contact surface 86 that contacts a regulating surface 85 of the regulating member 26 and a concave portion 81.
Having. That is, the contact surface 86 is formed in a flat shape or a concave portion inside the valve body, and thus the valve body 6 can be moved in a direction substantially perpendicular to the direction of movement of the valve body without any hindrance. . The planar shape is based on the fact that there may be a form in which operation in the right-angle direction is permitted even if a projection is provided on a part of the contact surface 86.

When the valve element 5 is closed during the compression process of the plunger 2, the pressure in the pump chamber 12 increases, whereby the valve element 6 is automatically opened, and the fuel is pumped to the common rail 53.

The valve element 5 opens automatically when the pressure in the pump chamber 12 becomes lower than the fuel introduction port.
Controlled by 0.

When the solenoid valve 90 is held in the ON state, an electromagnetic force greater than the urging force of the spring 92 is generated to draw the rod 91 toward the solenoid valve 90, so that the rod 91 and the valve body 5 are separated. In this state, the valve element 5 is an automatic valve that opens and closes in synchronization with the reciprocation of the plunger 2. Therefore, during the compression process, the valve element 5 is closed, and the fuel corresponding to the reduced volume of the pump chamber 12 pushes the valve element 6 open and is fed to the common rail 53 by pressure. Therefore, the discharge can be performed with the maximum capacity of the pump.

On the other hand, when the electromagnetic valve 90 is held in the OFF state, the rod 91 is engaged with the valve element 5 by the urging force of the spring 92, and holds the valve element 5 in the open state. Therefore, even in the compression step, the pressure in the pump chamber 12 maintains a low pressure state substantially equal to that of the fuel inlet port, so that the valve 6 cannot be opened, and the fuel corresponding to the reduced volume of the pump chamber 12 is It is returned to the fuel inlet side through the valve element 5. Therefore, the pump discharge amount becomes zero.

During the compression step, the solenoid valve 90 is
If the state is N, the fuel is fed to the common rail 53 from this time. Once the pumping starts, the pressure in the pump chamber 12 rises. Therefore, even if the solenoid valve 90 is turned off, the valve body 5 remains closed and automatically opens in synchronization with the start of the suction process. Therefore, the discharge amount can be adjusted by the ON timing of the solenoid valve 90. Also,
By controlling the solenoid valve 90 by calculating an appropriate discharge timing by the control unit 57 based on the signal of the pressure sensor 56, the pressure of the common rail 53 can be maintained at a substantially constant value.

Next, an embodiment in which the present invention is applied to a discharge-side check valve of a high-pressure pump will be described with reference to FIGS.
FIGS. 2 and 4 are enlarged views of the check valve 22 which is also the discharge valve shown in FIG. 1, and show a valve open state and a valve closed state, respectively.

The check valve 22 includes a valve housing 21 and a valve seat 2.
8. A valve body 6 (conical valve) forming a cone, a spring 24 for urging the valve body 6, a regulating member 26 and a sealing member 27 which are disposed in the valve housing 21 as a separate member from the valve housing. Have been. The valve body 6 is composed of a sealing surface 80 having a conical cross section, a concave portion 81 formed with a bottom, and a contact portion 82 having a contact surface 86 that comes into contact with the regulating member 26. Spring 2
4 is supported. The recess is formed in the bottom 8 abutting on the spring 24.
There are three. The restricting member 26 is a cylindrical body, one of which is open, has a restricting surface on the open side, and has a cylindrical shape with the bottom on the other side, and is disposed in a cylindrical space 88. A regulating portion 25 having a regulating surface 85 for regulating the amount of movement of the valve element 6 when the valve is opened is provided, and the fuel passages 30 and 31 are provided, respectively, while supporting the spring 24 at the central bottom portion 83. The restricting portion 25 is set so that the valve body 6 overlaps the inclined surface of the valve seat 28 even when the movement amount of the valve body 6 is the maximum, and the amount is controlled by the operating conditions and the pressure in the same portion. Determined from losses and other factors. Also, the fuel passages 30 and 31
Communicates with the common rail 53 via the pump chamber 12 and the discharge passage 11 shown in FIG. Check valve 22
Is screwed into a mounting hole 29 formed in the pump casing 1, and the seal member 27 is pressed by the valve housing 21 and the valve seat 28, thereby sealing internal leakage and external leakage of the check valve 22.

The regulating portion 25 has a function as a holding portion for holding the valve body 6 when the valve is opened. Therefore, the valve element 6 has a holding portion for holding the valve element when the valve is opened,
The valve has a surface that comes into contact with the holding portion, and the contact surface and the holding surface of the holding portion are formed substantially at right angles to the direction of movement of the valve element in the valve seat direction. As a result, the valve element 6 can be moved in a direction substantially perpendicular to the movement of the valve element in the valve seat direction.

FIG. 3 is a view for explaining the mechanism of the self-alignment of the valve element 6. In the figure, the regulating portion 25 that regulates the movement (movement amount) of the valve body 6 in the direction opposite to the valve seat direction (counter-valve direction) has a surface 85 (regulation surface) that regulates movement.
Has a contact surface 86 that comes into contact with the regulating surface 85.
As a result, the contact surface 86 comes into contact with the restriction surface 85, and further movement of the valve body 6 is restricted or restricted. As shown in the drawing, a part of the contact surface 86 is formed with a concave portion 81 inside the valve body 6. All flat or
A part in the vicinity of the central portion may be formed outward, that is, a convex portion on the bottom 83 side. When the contact surface 86 comes into contact with the regulating surface 85, the valve element 6 moves the valve element 6 in a direction substantially perpendicular to the moving direction of the valve element, that is, the direction of the valve seat 28-the bottom 31 (valve seat direction). The contact state with the regulating surface 85 is set so as to allow the movable surface to move.

In the above-described configuration, as shown in the figure, the sealing surface 80 of the valve body 6 and the sealing surface 79 of the valve seat overlap in the above-described perpendicular direction by a length L.

Now, it is assumed that the valve body 6 is moved in a substantially right-angle direction for any reason so as to be in a relationship between the valve body 6 and the valve seat 28 as shown in the figure (the contact surface 86 contacts the regulating surface 85). Even when not in contact). Fuel passage S between the valve body 6 and the valve seat 28 which is formed in communication with the pump chamber 12 becomes S ₂ in S _1, and the lower side at the upper side in FIG. S ₁ <S ₂ . This situation is shown in FIG. Of course, not only the up and down direction, S ₁ is also in the side direction, S ₂ is caused. Therefore, S
The relationship between the speeds V ₁ and V ₂ of the fuel flowing through ₁ and S ₂ is V ₁ > V ₂
Becomes The forces P ₁ and P ₂ acting on the valve element 6 by the pressure of the fuel flowing through S ₁ and S ₂ satisfy P ₁ > P ₂ . Therefore, the valve element 6
Is pushed downward by the force of P ₁ -P ₂ = P and returned to the center. That is, self-centering is performed. As described above, in the self-alignment, the relationship between the contact surface 86 and the regulating surface 85 is movable in a substantially right-angle direction, but can be performed by restricting the movement in the valve seat direction. There is no occurrence of damage accident due to contact with the regulating member 26. Accordingly, the fuel passage S can be set large, and the pressure loss can be made extremely small when the fuel flows from the pump chamber 12 to the discharge passage 11, and the fuel pressure to the common rail 53 can be reduced. Fluctuations can be small.

In the check valve thus configured, when the fuel pressure in the pump chamber 12 overcomes the urging force of the spring 24, the valve body 6 separates from the valve seat 28, and the check valve 22 opens. At this time, when the amount of discharged fuel is small, the valve body 6 floats on the inclined surface of the valve seat 28 without contacting the regulating portion 25, but the inclined flow formed by the valve body 6 and the valve seat 28 The valve element 6 can be held at a stable position in the inclined flow path by the fluid force flowing through the passage. When the amount of fuel to be discharged is maximum, the valve body 6 comes into contact with the regulating portion 25 to regulate the valve lift. However, since the valve body 6 overlaps on the inclined surface of the valve seat 28, the valve body 6 overlaps as described above. The valve element 6 is held at a stable position in the inclined flow path.

The reason why the valve element 6 is stabilized in the inclined flow path is that the valve element 6 is not limited to the fluid force acting on the valve element 6.
Is directly supported by a spring, and the valve body moves (lifts).
This is because movement (fine movement) in a direction substantially perpendicular to the direction can be performed. Since this movement amount is within the allowable range of the stress acting in the lateral direction of the spring 24, the durability of the spring or the like does not deteriorate.

Further, similarly, when the check valve 22 is closed, the valve element 6 is always present in the inclined flow path, so that the valve element 6 moves along the inclined surface of the valve seat 28. Can be stably seated, so that the sealing performance at the same portion can be improved.

Next, another embodiment of the present invention will be described. FIG. 5 shows a check valve 22 according to another embodiment of the present invention.
FIG. Here, components denoted by the same reference numerals as those in the embodiment shown in FIG. 2 perform the same operation.

The present embodiment is characterized in that the regulating member 2 provided as a separate member in the discharge passage is different from the previous embodiment.
6 is eliminated. That is, a bottomed recess 32 is provided in the center of the valve housing 21 itself, and the spring 24 is supported at the bottom of the recess 32. A regulating portion 33 that regulates the amount of movement of the valve body 6 is integrally provided at an end of the concave portion 32 on the valve seat 28 side. In addition, a plurality of communication holes 34 are formed outside the regulating portion 33, and a communication hole 35 is formed diagonally so as to communicate with the communication hole 34.
Is in communication with The other configuration is almost the same as the previous embodiment.

By adopting such a configuration, the regulating member 26 can be eliminated, and thus the cost can be reduced. Further, even if the regulating member 26 is not provided, the fluid force of the fuel generated when the fuel flows through the inclined flow path can be generated more effectively, so that the valve body 6 is held at a stable position in the inclined flow path. When the check valve 22 is closed, the valve element 6 is always present in the inclined flow path, so that the valve element 6 is connected to the valve seat 28 along the inclined surface of the valve seat 28. Since the seat can be stably seated, the sealing performance at the same portion can be improved.

Next, another embodiment of the present invention will be described. In the above-described embodiment, an example in which the present invention is applied to the discharge-side check valve is shown. However, the present invention can also be applied to the suction-side check valve.

FIG. 6 shows an example. The check valve 62 includes a valve housing 61, a valve seat 68, a conical valve (valve element) 75, a spring 63 for urging the conical valve 75, a regulating member 66, and a sealing member 67. The cross section of the seat 78 is formed in a conical shape. The regulating member 66 has a bottomed cylindrical shape, and a spring 63
And a regulating portion 65 for regulating the movement (amount) of the conical valve 75 when the valve is opened, and fuel passages 70 and 71 are provided, respectively. When the movement (amount) of the valve body 6 is the maximum, the restricting portion 65 can keep the conical valve 7
5 are set so as to overlap with each other, and the amount is determined based on operating conditions, pressure loss at the same part, and the like.
The fuel passages 70 and 71 are connected to the pump chamber 1 shown in FIG.
2 and the suction passage. The check valve 62 is screwed into a mounting hole 69 formed in the pump casing 1, and the seal member 67 is pressed by the valve housing 61 and the valve seat 68 to seal the internal leak and the external leak of the check valve 62. are doing. The other configuration is almost the same as the previous embodiment.

In the check valve configured as described above, when the fuel pressure in the pump chamber 12 decreases and becomes lower than the pressure in the suction passage by a pressure corresponding to the urging force of the spring 24,
The conical valve 75 is disengaged from the valve seat 68, and the check valve 62 opens. At this time, when the amount of fuel to be sucked in is small, the conical valve 75 floats on the inclined surface of the valve seat 68 without contacting the regulating portion 65, but the inclined flow path formed by the conical valve 75 and the valve seat 68 , The conical valve 75 can be held at a stable position in the inclined flow path. When the amount of fuel to be sucked is maximized, the conical valve 75 is
5, the valve lift is regulated, but the conical valve 75
Overlaps in the inclined plane of the valve seat 68,
As described above, the conical valve 75 is held at a stable position in the inclined flow path.

The reason that the posture of the conical valve 75 is stabilized in the inclined flow path is that when the conical valve 75 is eccentric in the inclined flow path, a fluid force acting to push the conical valve 75 back to the center acts. This is because the conical valve 75 is directly supported by a spring, and the valve body can move (finely move) in a direction substantially perpendicular to the moving (lift) direction. This movement amount
Since the stress acting in the lateral direction of the spring 63 is within the allowable range, the durability of the spring or the like is not impaired.

Similarly, when the check valve 62 is closed, the conical valve 75 is always present in the inclined flow path, so that the conical valve 75 returns along the inclined surface of the valve seat 68. Therefore, the seat can be stably seated on the valve seat 68, so that the sealing performance at the same portion can be improved.

In the above embodiment, the conical valve 75
Is moved by the regulating portion 65 of the regulating member 66.
The present invention is not limited to this, and the cost can be reduced by, for example, eliminating the regulating member 66 and providing the valve housing 61 with the regulating portion.

In the embodiment described above,
Although the shape of the valve body is a conical shape, the present invention is not limited to this shape. For example, the same effect as that of the present embodiment can be obtained by forming the valve body into a spherical shape.

[0037]

As described above, according to the present invention, a support portion for supporting an elastic body is provided on a valve body, and a restricting portion or a holding portion for restricting the amount of movement of the valve body when the valve is opened is formed. In addition, by configuring the valve element to be movable in a direction substantially perpendicular to the moving direction of the valve element, pressure loss during fuel pumping can be reduced, and the valve element can be moved to a stable position in the passage. Since the valve body can be held and the valve element can be stably seated on the valve seat, the sealing performance at the same portion can be improved. Further, since the suction valve or the discharge valve can be a check valve having a simple structure, an inexpensive fuel supply pump can be obtained. Further, the reliability of the elastic body can be improved.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a high-pressure fuel pump according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a discharge-side check valve in the high-pressure fuel pump according to the present invention.

FIG. 3 is an enlarged view of a part of the configuration of FIG. 2;

FIG. 4 is a sectional view showing one embodiment of a discharge-side check valve in the high-pressure fuel pump of the present invention.

FIG. 5 is a sectional view of a discharge-side check valve showing another embodiment of the present invention.

FIG. 6 is a sectional view showing an example in which the present invention is applied to a suction-side check valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pump casing, 2 ... Plunger, 5, 6 ... Valve element, 7 ... High-pressure fuel pump, 10 ... Suction flow path, 11 ... Discharge flow path, 12 ... Pump chamber, 21, 61 ... Valve housing, 2
2, 62 ... check valve, 23, 24, 63 ... spring, 25, 3
3, 65 ... regulating part, 26, 66 ... regulating member, 27, 67
... Seal member, 28, 68 ... Valve seat, 75 ... Conical valve, 7
9, 80 ... sealing surface, 81 ... concave portion, 83 ... bottom portion, 85 ...
Control surface, 86: contact surface, 88: cylindrical space.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kenichiro Tokuo 502 Kandamachi, Tsuchiura-city, Ibaraki Pref.Mechanical Research Laboratories Co., Ltd. Inside the Machinery Research Laboratory (72) Inventor Hiroyuki Yamada 2520 Odaiba, Hitachinaka-shi, Ibaraki F-term in the Automotive Equipment Group, Hitachi, Ltd. (Reference) 3G066 AC09 BA36 BA61 CA04S CA22S CA34 CD10 CE34

Claims (9)

[Claims] A suction passage for supplying fuel, a discharge passage for discharging fuel to an injection valve side, a pump chamber communicating with the suction passage and the discharge passage, and a pump section for increasing the pressure of the fuel in the pump chamber. A fuel supply pump having a check valve for regulating a flow direction of fuel to a pump chamber in at least one of the suction passage and the discharge passage, wherein the check valve includes a valve seat and a valve seat. A valve body that comes into contact with the valve body and an elastic body that urges the valve body toward the valve seat side, and a support portion that supports the elastic body is provided on the valve body, and when the valve is opened, the valve body moves in the valve seat direction. Forming a regulating portion having a surface that regulates the movement of the, the valve body has a contact surface that contacts the regulating portion,
The contact surface and the regulating surface of the regulating portion are formed substantially at right angles to the valve seat direction, and the contact surface is formed in a flat shape or a concave portion in the valve body, and the valve body is formed. A fuel supply pump movable in a direction substantially perpendicular to a moving direction of a valve body. 2. A suction passage for supplying fuel, a discharge passage for discharging fuel to the injection valve side, a pump chamber communicating with the suction passage and the discharge passage, and a pump unit for increasing the pressure of the fuel in the pump chamber. A fuel supply pump having a check valve for regulating a flow direction of fuel to a pump chamber in at least one of the suction passage and the discharge passage, wherein the check valve includes a valve seat and a valve seat. A valve element that is in contact with the valve body, and an elastic body that urges the valve body toward the valve seat; a support portion that supports the elastic body is provided on the valve body; While the seat surface of the valve seat is disposed so as to overlap in a direction perpendicular to the direction of the valve body and the valve seat, the front valve body has a holding surface for holding the valve body when the valve is opened, It has a contact surface that contacts the holding part,
The contact surface and the holding surface are formed in a direction substantially perpendicular to the moving direction of the valve body in the valve seat direction, and the contact surface is formed in a planar shape or a concave portion in the valve body. Wherein the valve element is movable in a direction substantially perpendicular to the direction of movement of the valve element in the valve seat direction. 3. A suction passage for supplying fuel, a discharge passage for discharging fuel to the injection valve side, a pump chamber communicating with the suction passage and the discharge passage, and a pump unit for increasing the pressure of the fuel in the pump chamber. A fuel supply pump having a check valve for regulating a flow direction of fuel to a pump chamber in at least one of the suction passage and the discharge passage, wherein the check valve includes a valve seat and a valve seat. A valve element that is in contact with the valve body, and an elastic body that urges the valve body toward the valve seat; a support portion that supports the elastic body is provided on the valve body; A fuel flow formed between the seat surface of the overlapped valve body and the seat surface of the valve seat is disposed such that the seat surface of the valve seat overlaps in a direction perpendicular to the direction of the valve body and the valve seat. The valve element moves due to the pressure of the fuel flowing through the passage. A fuel supply pump, characterized in that the heart self-in movable schematically a direction perpendicular to the direction. 4. The fuel supply pump according to claim 1, wherein the valve body has a conical shape. 5. The fuel supply pump according to claim 1, wherein the valve body is spherical. 6. A suction passage for supplying fuel, a discharge passage for discharging fuel to the injection valve side, a pump chamber communicating with the suction passage and the discharge passage, and a pump unit for increasing the pressure of the fuel in the pump chamber. A fuel supply pump having a check valve for regulating a flow direction of fuel to a pump chamber in at least one of the suction passage and the discharge passage, wherein the check valve includes a valve seat and a valve seat. A valve body that is in contact with the valve body, configured by an elastic body that biases the valve body toward the valve seat, has a bottom on one side that supports the elastic body on the valve body, and a cylindrical body that is open on the other side. The elastic body is provided on the cylindrical body, and a regulating portion having a surface for regulating the movement of the valve body in the direction opposite to the valve seat when the valve is opened is formed on the open side, and the valve body is provided on the regulating portion. An abutting surface that abuts, and the abutting surface and the regulating surface are opposed in the valve seat direction; The contact surface is formed in a plane or a concave portion in the valve body, and the valve body is movable in a direction substantially perpendicular to the moving direction of the valve body. And the fuel supply pump. 7. A suction passage for supplying fuel, a discharge passage for discharging fuel to the injection valve side, a pump chamber communicating with the suction passage and the discharge passage, and a pump section for increasing the pressure of the fuel in the pump chamber. A fuel supply pump having a check valve for regulating a flow direction of fuel to a pump chamber in at least one of the suction passage and the discharge passage, wherein the check valve includes a valve seat and a valve seat. A valve body that is in contact with the valve body, configured by an elastic body that biases the valve body toward the valve seat, has a bottom on one side that supports the elastic body on the valve body, and a cylindrical body that is open on the other side. And the elastic body is disposed in the cylindrical body, the valve body is disposed so that the seat surface of the valve body and the seat surface of the valve seat overlap when the valve is opened to the open side, and the front valve body is opened. Sometimes a holding surface for holding the valve body is formed, An abutment surface that abuts, the abutment surface and the holding surface are formed in a direction substantially perpendicular to the direction of movement of the valve body in the valve seat direction, and the abutment surface is a flat surface or a valve; A fuel supply pump, wherein the valve body is formed with a recess inside the body, and the valve body is movable in a direction substantially perpendicular to a moving direction of the valve body in a valve seat direction. 8. A pump for boosting fuel, a common rail for accumulating pressurized fuel, and an injection nozzle for injecting fuel in the common rail to each cylinder of the internal combustion engine to intermittently inject fuel in response to an electric signal. A supply passage for supplying fuel, a passage for discharging fuel to a common rail, a discharge valve for opening the discharge passage at a predetermined pressure, and a passage for communicating the supply passage and the discharge passage. In a high-pressure fuel supply system including a fuel supply pump having an electromagnetic valve that connects the supply passage and the discharge passage at the time of a valve, the fuel supply pump applies the discharge valve to a valve seat and the valve seat. A valve body that is in contact with the valve body and an elastic body that urges the valve body toward the valve seat, a support portion that supports the elastic body is provided on the valve body, and regulation that restricts movement of the valve body when the valve is opened. Forming a part, the valve body A seat surface and a seat surface of the valve seat are arranged so as to overlap with each other, and the valve body has a holding portion that holds the valve body when the valve is opened, and a contact surface that contacts the holding portion. The surface and the holding surface of the holding portion are formed in a direction substantially perpendicular to the moving direction of the valve body in the valve seat direction, and the valve body is moved in the moving direction of the valve body in the valve seat direction. A high-pressure fuel supply system that is movable in a direction substantially perpendicular to the high-pressure fuel supply system. 9. A pump section for increasing the pressure of a fuel, a common rail for accumulating pressurized fuel, and an injection nozzle for injecting fuel in the common rail to each cylinder of the internal combustion engine to intermittently inject fuel in response to an electric signal. And a supply passage for supplying fuel,
A high-pressure fuel supply system including a fuel supply pump having a passage for discharging fuel to a common rail, a discharge valve for opening the discharge passage at a predetermined pressure, and a suction valve for opening the supply passage at a predetermined pressure. In the fuel supply pump, at least the suction valve of the suction valve or the discharge valve,
A valve seat, a valve body that abuts on the valve seat, and an elastic body that urges the valve body toward the valve seat, and a support portion that supports the elastic body is provided on the valve body. A regulating portion for regulating the movement of the valve body is formed, and the regulating section is arranged so that the seat surface of the valve body and the seat surface of the valve seat overlap, and the seat surface of the overlapped valve body and the seat of the valve seat overlap. The fuel supply pump is characterized in that the valve element moves in a direction substantially perpendicular to the moving direction of the valve element and is self-aligned by the pressure of the fuel flowing through the fuel flow path formed between the fuel supply pump and the surface. High pressure fuel supply system.