JP2005188379A - Check valve and fuel injection pump equipped with the check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve capable of suppressing wear and a fuel injection valve using the check valve. <P>SOLUTION: In the check valve 4 equipped with a valve seat member 41 having a valve seat part 49 and a valve element 42 having a valve element seat part 47 seated on and leaving the valve seat part 49, corner parts 473 of the valve element seat part 47 contacting the valve seat part 49 are made to be R-shaped. Since contact surface pressure of the valve seat part 49 and the valve element seat part 47 is reduced, wear of the valve seat part 49 and the valve element seat part 47 can be suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a check valve mainly used in a fuel injection pump of an internal combustion engine (hereinafter, “internal combustion engine” is referred to as an engine), and a fuel injection pump including the check valve.

  2. Description of the Related Art Conventionally, a common rail fuel injection system used in, for example, a diesel engine includes a fuel injection pump that pressurizes fuel and supplies the fuel to the common rail. The fuel injection pump includes a camshaft connected to an engine crankshaft and rotated, and the rotational motion of the camshaft is converted into a reciprocating motion by, for example, a cam and transmitted to a plunger disposed in a cylinder. . Then, when the plunger is driven to reciprocate, fuel is sucked into the pressurizing chamber, pressurized, and sent to the common rail.

  In such a fuel injection pump, a check valve 100 as shown in FIG. 13 is disposed on the fuel suction side to the pressurizing chamber. The check valve 100 includes a valve body 101 and a valve seat member 102. The valve seat member 102 is provided with a valve seat sheet portion 103. The valve body 101 is seated on and separated from the valve seat sheet portion 103. The valve body sheet | seat part 104 is provided. The valve seat portion 103 includes a substantially cylindrical second valve seat portion 103a provided on the inner wall of the valve chamber 106, and a tapered surface extending from the downstream end of the second valve seat portion 103a. 1st valve seat part 103b. The valve body seat portion 104 includes a substantially truncated cone-shaped first valve body seat portion 104a and a substantially cylindrical second valve body seat portion 104b extending from the downstream end of the first valve body seat portion 104a. Have. Further, the valve seat member 102 is formed with a fuel inflow passage 105 for introducing combustion into the valve chamber 106. A washer 107 is attached to the shaft portion of the valve body 101, and the valve body 101 is urged in the valve closing direction by a spring 108 mounted between the washer 107 and the valve seat member 102.

In order to make the fuel injection pump compact, a check valve as shown in FIG.
Special Table 2001-500220

  However, in the check valve 100 shown in FIG. 13, when poor fuel with poor lubricity (hereinafter also referred to as poor lubrication) is used, the valve seat portion 103 and the valve seat portion 103 come into contact with each other. There is a problem in that wear between the valve seat sheet portion 103 and the valve body seat portion 104 proceeds because the friction between the corner portion 104c of the valve body seat portion 104 and the valve body seat portion 104 that is poorly lubricated increases. In particular, in the high-pressure fuel pump, there is a problem in that wear tends to proceed because the load on the valve body 101 increases.

  On the other hand, check valves in a high-pressure fuel path such as a fuel injection pump have been difficult to improve because they have disadvantages such as an increase in physique. In particular, in a small-sized pump, an increase in the size of the check valve leads to an increase in the size of the pump body, causing a problem in terms of merchantability.

  The present invention solves the above-described problem, and a check valve capable of suppressing wear even in operation in a poorly lubricated state by using poor fuel or the like without increasing the physique and such a check. It aims at providing a fuel injection pump provided with a valve.

  The check valve according to claim 1, comprising a valve seat member having a valve seat portion and a valve body having a valve seat portion that is seated on and separated from the valve seat portion, the valve seat portion A corner portion of the valve body seat portion that contacts the base is rounded. According to this, since the contact surface pressure between the valve seat and the valve seat is reduced due to the rounded corners of the valve seat, the valve seat can be used even in a poorly lubricated state. Wear of the valve portion and the valve body seat portion can be suppressed. Further, since the corners are merely rounded, the physique does not increase.

  The check valve according to claim 2 includes a valve seat member having a valve seat portion and a valve body having a valve seat portion that sits on and separates from the valve seat portion, and the valve seat portion And the corner | angular part of the said valve body sheet | seat part which does not contact the said valve seat sheet | seat part in the state in which the said valve body sheet | seat part is not worn was made into the round shape. According to this, even if the wear progresses and the corner of the valve body seat that originally did not contact the valve seat is brought into contact, the corner is rounded, Since the contact surface pressure between the seat portion and the valve seat portion is reduced, it is possible to suppress wear of the valve seat portion and the valve seat portion even in a poorly lubricated state. Further, since the corners are merely rounded, the physique does not increase.

  The check valve according to claim 3, comprising: a valve seat member having a valve seat portion; and a valve body having a valve seat portion that sits on and separates from the valve seat portion; The corner portion of the valve seat portion that comes into contact with the corner is rounded. According to this, since the contact surface pressure between the valve seat portion and the valve seat portion is reduced due to the rounded corners of the valve seat portion, the valve seat is improved even in a poorly lubricated state. Wear of the valve portion and the valve body seat portion can be suppressed. Further, since the corners are merely rounded, the physique does not increase.

  The check valve according to claim 4, comprising: a valve seat member having a valve seat portion; and a valve body having a valve seat portion that sits on and separates from the valve seat portion, the valve seat portion And the corner | angular part of the said valve seat sheet | seat part which does not contact the said valve body sheet | seat part in the state in which the said valve body sheet | seat part is not worn was made into the round shape. According to this, even if the wear progresses and the corner of the valve seat portion that originally did not contact the valve seat portion comes into contact, the corner portion is rounded, Since the contact surface pressure between the seat portion and the valve seat portion is reduced, it is possible to suppress wear of the valve seat portion and the valve seat portion even in a poorly lubricated state. Further, since the corners are merely rounded, the physique does not increase.

  The check valve according to claim 5, comprising: a valve seat member having a valve seat portion; and a valve body having a valve seat portion that sits on and separates from the valve seat portion, the valve seat portion A corner portion of the valve body seat portion that does not contact the valve seat portion when the valve seat portion and the valve seat portion are not worn. A corner of the valve seat, which contacts the seat, a corner of the valve seat which does not contact the valve seat when the valve seat and the valve seat are not worn. Any two or more of the corners are rounded. According to this, the effect of suppressing wear is improved by forming a plurality of corners where wear is expected to be rounded.

  The fuel injection pump according to claim 6, a movable member that is reciprocated, a pressurizing chamber that is repeatedly expanded and contracted by reciprocating the movable member, and discharges fuel from the pressurizing chamber. A check valve according to any one of claims 1 to 5, further comprising a fuel discharge passage and a fuel inflow passage provided on an upstream side of the pressurizing chamber. According to this, since the wear of the check valve can be suppressed as described above, the possibility of the check valve sticking and the deterioration of the sealing performance due to the progress of wear is reduced, and the performance of the fuel injection pump can be stabilized for a long time.

  (First Embodiment) A first embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the fuel injection pump 1 includes a housing 2, and the housing 2 includes cylinder heads 21 and 22. A camshaft 13 is rotatably supported by the housing 2 via journals 14 and 109. A cam 17 having a circular cross section is integrally formed on the camshaft 13 so as to be eccentric with respect to the center of the camshaft 13. A cam ring 18 having a rectangular outer shape is fitted to the cam 17 via a bearing 19. The bearing 19 is press-fitted into the cam ring 18. The cam 17 and the bearing 19 are slidable.

  In the pump 1, plungers 30, 30 as movable members are disposed on the outer periphery of the cam 17 in the circumferential direction. Plungers 30 and 30 are disposed on opposite sides of the camshaft 13 by 180 °. Each plunger 30 is supported so as to be able to reciprocate in a cylinder 10 formed inside each of the cylinder heads 21 and 22. An end surface 30 a of each plunger 30 facing the cam ring 18 is formed in a flat shape, is in contact with a flat portion of the outer peripheral surface of the cam ring 18, and is slidable in the circumferential direction of the cam 17. Each plunger 30 is urged toward the cam ring 18 by each spring 31.

  The check valves 4 are provided inside the cylinder heads 21 and 22 so as to face the end surface 30b opposite to the end surface 30a of the plunger 30, respectively. In each cylinder 10, a pressurizing chamber 5 is formed by the inner peripheral surface of the cylinder 10, the end surface 30 b of the plunger 30, and the end surface on the plunger 30 side of the check valve 4. Each pressurizing chamber 5 communicates with the fuel discharge passage 9 formed in each of the cylinder heads 21 and 22 via the valve chamber 11. A discharge valve 8 is disposed in the valve chamber 11.

  Each check valve 4 is assembled upstream of the pressurizing chamber 5 by a lid member 6 or the like. Here, the upstream side means the upstream side in the fuel flow. As shown in FIG. 3, each check valve 4 includes a valve seat member 41, a valve body 42 seated on the valve seat member 41, and a spring 44. The valve body 42 includes a substantially round rod-shaped shaft portion 46 and a valve body seat portion 47 extending from a downstream end portion of the shaft portion 46. The valve body seat part 47 is comprised from the 1st valve body sheet | seat part 471 of the substantially truncated cone shape whose downstream side is expanded, and the 2nd valve body sheet | seat part 472 of a substantially cylindrical shape. The second valve body seat portion 472 extends from the downstream end portion of the first valve body seat portion 471 so as to have substantially the same diameter as the outer diameter of the first valve body seat portion 471 (the diameter of the downstream end portion). It is installed. Here, the downstream side means the downstream side in the fuel flow, and is the lower side in FIG. A downstream end face 47 a of the valve body seat portion 47 faces the end face 30 b of the plunger 30 shown in FIG. 1 and faces the pressurizing chamber 5.

  The shaft portion 46 is slidably inserted into a guide hole 48 formed in the valve seat member 41. A washer 43 is attached to the upper end portion of the shaft portion 46 in FIG. A spring 44 that is a compression coil spring is mounted between the washer 43 and the valve seat member 41 to urge the valve body 42 in the valve closing direction.

  The valve seat member 41 is formed with a valve chamber 45 closed by the valve body 42 on the downstream side of the guide hole 48. The valve chamber 45 also serves as a fuel passage. The valve seat member 41 is formed with a fuel inflow passage 7 for introducing fuel into the valve chamber 45. The fuel inflow passage 7 is connected to a feed pump (not shown) via a fuel introduction passage (not shown) provided in the pump 1 and a fuel adjustment valve (not shown) disposed in the fuel introduction passage. )It is connected to the. The feed pump is provided in the pump 1 and is rotationally driven by a camshaft 13 to supply fuel sucked from a fuel inlet (not shown) into the pump 1 through a fuel adjustment valve.

  A valve seat sheet portion 49 is formed on the inner wall of the valve seat member 41. The valve seat portion 49 includes a substantially cylindrical second valve seat portion 491 that forms the inner peripheral wall of the valve chamber 45, and a first valve seat that extends from the downstream end of the second valve seat portion 491. And a sheet portion 492. The first valve seat portion 492 has a substantially frustoconical taper surface whose diameter increases on the downstream side.

  The angle of the tapered surface 471a of the first valve body seat part 471 with respect to the axis of the valve body 42 is formed to be slightly larger than the angle of the first valve seat sheet part 492 with respect to the axis of the valve body 42. For this reason, at the time of valve closing, a corner portion 473 that is a connection portion between the first valve body seat portion 471 and the second valve body seat portion 472 contacts the first valve seat portion 492.

  As shown in FIG. 4, the corner portion 473 has a round shape (that is, a substantially arc surface shape). The corner portion 473 is substantially equal on the upper side (first valve body seat portion 471 side) and lower side (second valve body seat portion 472 side), with the tip portion 473a of the corner portion 473 before being rounded as the center. By chamfering, a round shape is formed. Further, the range of the rounded shape is a half of the difference between the outer diameter (the diameter of the downstream end) and the inner diameter (the diameter of the upstream end) of the valve seat 47 (that is, the corner 473 is rounded). When the length of the tapered surface 471a in the radial direction of the valve body 42 in the radial direction) is L1, and the length of the round-shaped portion in the radial direction of the valve body 42 is L2, L2 / L1 ≦ 2/3. . This is because if the shape is beyond this range, the physique of the valve body 42 may be changed, leading to an increase in the physique of the check valve 4. Further, as can be seen from the graph described later, the radius of curvature R of the corner portion 473 is 0.1 mm or 1/5 of L1 (that is, (L1) × 1/5), whichever is smaller. It is desirable.

  The operation of the pump 1 configured as described above will be described. When the camshaft 13 is rotationally driven by an engine crankshaft or the like, the cam 17 rotates, and the cam ring 18 revolves without rotating due to this rotation. Then, each plunger 30 which contacted the outer peripheral surface of the cam ring 18 reciprocates in the cylinder 10 (up and down movement in FIGS. 1 and 2). By this reciprocation, the expansion and reduction of the volume of the pressurizing chamber 5 are repeated, that is, the pressure in the pressurizing chamber 5 is repeatedly increased and decreased.

  When the plunger 30 moves away from the check valve 4 and the pressure in the pressurizing chamber 5 decreases, the discharge valve 8 closes and the check valve 4 opens. Then, the fuel pressure-fed by the feed pump and metered by the fuel adjustment valve is supplied into the valve chamber 45 through the fuel inflow passage 7 and pressurized between the valve body 42 and the valve seat portion 49. It flows into the chamber 5.

  Next, when the plunger 30 moves in the direction approaching the check valve 4, the pressure in the pressurizing chamber 5 rises and the check valve 4 is closed. When the pressure in the pressurizing chamber 5 reaches a predetermined pressure, the discharge valve 8 is opened, and the pressurized fuel is supplied to the common rail via the fuel discharge passage 9. At this time, the valve body seat portion 47 is pressed against the valve seat portion 49 by the pressure in the pressurizing chamber 5.

  In the first embodiment, the corner portion 473 is rounded. For this reason, when the check valve 4 is closed, biting of the corner portion 473 into the valve seat portion 49 is suppressed, and the contact surface pressure between the corner portion 473 and the valve seat portion 49 is reduced. For this reason, even in a poorly lubricated state as in the case of using poor fuel, it is possible to suppress wear of the valve seat 49 and the valve seat 47. Further, the corner portion 473 is merely rounded, and the overall shape of the valve seat portion 47 is not changed. Therefore, the physique of the valve body 42 is not changed, and the physique of the check valve 4 is not increased.

  The effect of reducing the contact surface pressure will be described with reference to FIG. In the graph of FIG. 5, in the valve body 42 in which the inner diameter of the valve body seat portion 47 is 5 mm and the outer diameter is 6 mm, the R of the corner portion 473 is changed, and the contact portion with the corner portion 473 of the valve seat sheet portion 49 is changed. The result of measuring the contact surface pressure is shown. From this graph, it can be seen that the contact surface pressure is reduced by making the corner portion 473 round. Moreover, if R is 0.1 mm or more, it turns out that the reduction effect of a contact surface pressure is acquired. Further, in the case of FIG. 5, L1 = 0.5 mm, and if R is 1/5 or more of L1, the effect of reducing the contact surface pressure was obtained. Therefore, the valve body 42 having a smaller L1 than in the case of FIG. In this case, if R is 1/5 or more of L1, it is estimated that a reduction effect of the contact surface pressure can be expected. That is, if R is 0.1 mm or 1/5 of L1, whichever is smaller, it is estimated that the effect of reducing the contact surface pressure can be expected.

  (Second Embodiment) A second embodiment of the present invention will be described. The second embodiment is different from the first embodiment only in the portion of the valve body 42 that is rounded. In addition, about the same part as 1st Embodiment, the same code | symbol is used and the description is abbreviate | omitted.

  In the second embodiment, as shown in FIGS. 6 and 7, not the corner portion 473, but a connection portion between the upper end surface 471 b of the first valve body seat portion 471 and the tapered surface 471 a, and the valve seat portion 49 And the corner | angular part 474 which does not contact the valve seat sheet | seat part 49 in the state which the valve body sheet | seat part 47 is not worn is made into the round shape.

  As shown in FIG. 7, the corner portion 474 is chamfered substantially equally on the upper end surface 471 b side and the tapered surface 471 a side around the tip portion 474 a of the corner portion 474 before being rounded. Formed. Further, the range of the rounded shape is a range where L3 / L1 ≦ 2/3 when the length of the rounded portion of the tapered surface 471a in the radial direction of the valve body 42 is L3. This is because if the shape is beyond this range, the physique of the valve body 42 may be changed, leading to an increase in the physique of the check valve 4. Further, from the above, it is desirable that the radius of curvature R of the corner portion 474 is 0.1 mm or 1/5 of L1, whichever is smaller.

  In the second embodiment, the corner portion 474 is rounded because the corner portion 474 newly contacts the valve seat portion 49 when wear progresses due to contact between the corner portion 473 and the valve seat portion 49. Because it will do.

  And when the corner | angular part 474 comes in contact with the valve seat sheet | seat part 49, since the corner | angular part 474 is made into a round shape in 2nd Embodiment, it contacts with the corner | angular part 474 of the valve seat sheet | seat part 49. The surface pressure is reduced, and wear can be suppressed. Further, the corner portion 474 is merely rounded, and the physique of the valve body 42 is not changed, so that the physique of the check valve 4 is not increased.

  (Third Embodiment) A third embodiment of the present invention will be described. The third embodiment is different from the first embodiment only in a portion having a round shape. In addition, about the same part as 1st Embodiment, the same code | symbol is used and the description is abbreviate | omitted.

  As shown in FIGS. 8 and 9, in the third embodiment, the first valve seat portion 493 of the valve seat portion 49 has a tapered surface 493a, a step portion 493b, and a cylindrical surface 493c, and the tapered surface 493a. The connecting portion between the step portion 493b and the step portion 493b is a corner portion 493d. And the 1st valve body sheet | seat part 471 contacts the corner | angular part 493d at the time of valve closing.

  Therefore, in the third embodiment, the corner portion 493d is rounded. As shown in FIG. 9, the corner portion 493d is rounded substantially equally on the tapered surface 493a side and the stepped portion 493b side around the tip portion 493e of the corner portion 493d before the round shape. Formed. The range of the rounded shape is 1/2 of the difference between the diameter of the downstream end of the tapered surface 493a and the diameter of the upstream end (that is, the valve body of the tapered surface 493a in which the corner 493d is not rounded) The length in the radial direction of the taper surface 493a is L4, and the length in the radial direction of the valve body 42 of the tapered surface 493a is L5, so that L5 / L4 ≦ 2/3. This is because if the shape is round beyond this range, the physique of the valve seat member 41 may be changed, leading to an increase in the physique of the check valve 4. In addition, from the above, it is desirable that the radius of curvature R of the corner portion 493d is 0.1 mm or 1/5 of L4, whichever is smaller.

  As in the third embodiment, if the corner portion 493d of the valve seat portion 49 that contacts the valve body seat portion 47 is rounded, the contact surface pressure at the corner portion 493d is reduced, and wear can be suppressed. It becomes. Further, only the corner portion 493d is rounded, and the overall shape of the valve seat portion 49 is not changed. Therefore, the physique of the valve seat member 41 is not changed, and the physique of the check valve 4 is not increased.

  (Fourth Embodiment) A fourth embodiment of the present invention will be described. The fourth embodiment is different from the third embodiment only in a portion of the valve seat member 41 having a round shape. In addition, about the same part as 3rd Embodiment, the same code | symbol is used and the description is abbreviate | omitted.

  As shown in FIGS. 10 and 11, in the fourth embodiment, the second valve seat portion 491 and the first valve seat portion 493 of the valve seat portion 49 are connected to the first valve seat portion. In a state where the portion 493 and the first valve body seat portion 471 are not worn, the corner portion 494 that does not contact the valve body seat portion 47 has a rounded shape. The corner portion 494 is located downstream of the upper end surface 471b of the first valve body seat portion 471.

  As shown in FIG. 11, the corner portion 494 is substantially equal on the second valve seat seat portion 491 side and the first valve seat seat portion 493 side around the tip portion 494a of the corner portion 494 before being rounded. By chamfering, a round shape is formed. The range of the round shape is a range where L6 / L4 ≦ 2/3, where L6 is the length in the radial direction of the valve body 42 in the radial direction. This is because, if the shape is beyond this range, the physique of the valve seat member 41 may be changed, leading to an increase in the physique of the check valve 4. Further, the radius of curvature R of the corner portion 494 is preferably 0.1 mm or 1/5 of L4, whichever is smaller, as described above.

  In the fourth embodiment, the corner portion 494 is rounded because the corner portion 494 newly contacts the valve body seat portion 47 when the wear progresses due to contact between the corner portion 493d and the valve body seat portion 47. Because it will do.

  And when the corner | angular part 494 comes in contact with the valve body sheet | seat part 47, since the corner | angular part 494 is made into a round shape in 4th Embodiment, the contact surface pressure in the corner | angular part 494 is reduced. Thus, wear can be suppressed. Further, the corner portion 494 is merely rounded, and the physique of the valve seat member 41 does not change, so that the physique of the check valve 4 is not increased.

  (Fifth Embodiment) A fifth embodiment of the present invention will be described. In addition, about the same part as 1st Embodiment, the same code | symbol is used and the description is abbreviate | omitted. As shown in FIG. 12, in 5th Embodiment, while making the corner | angular part 473 of the valve body sheet | seat part 47 into a round shape, the 2nd valve seat sheet | seat part 491 and the 1st valve seat sheet | seat part 492 of the valve seat sheet | seat part 49 are used. The corner part 495 which is a connection part is made into a round shape. The range of the round shape is the same as that of the first and fourth embodiments, respectively. In this way, if the plurality of corners where wear is expected are rounded, the effect of suppressing wear is improved.

  In addition, the combination of the corner | angular part made into a round shape is not restricted to what was shown in 5th Embodiment, Various combinations, such as the corner | angular part 473 and the corner | angular part 474, the corner | angular part 494 and the corner | angular part 493d, can be taken. Three or more corners may be rounded.

  In the second embodiment, the corner 474 upstream of the corner 473 is rounded, but the valve seat 47 and the valve seat 49 are not worn downstream from the corner 473. Then, although it does not contact the valve seat part 49, when there exists a corner | angular part which may contact as wear progresses, it is good also considering the corner | angular part as a round shape.

  Similarly, in the fourth embodiment, the corner 494 upstream of the corner 493d is rounded, but the valve body seat 47 and the valve seat 49 are not worn downstream from the corner 493d. When there is a corner portion that does not come into contact with the valve seat portion 47 in the state but may come into contact with the progress of wear, the corner portion may be rounded.

  That is, the present invention can adopt various configurations without departing from the scope of the claims.

It is a schematic sectional drawing of the fuel injection pump of 1st Embodiment of this invention. FIG. 2 is a schematic sectional view of the fuel injection pump of FIG. 1 cut along a plane perpendicular to the axial direction of the camshaft. It is a schematic sectional drawing of the non-return valve of 1st Embodiment of this invention. It is a principal part enlarged view of the non-return valve of FIG. It is a graph which shows the measurement result of the contact surface pressure with the curvature radius in the valve body corner | angular part of the check valve of FIG. 3, and the valve body corner | angular part in a valve seat sheet | seat part. It is a schematic sectional drawing of the check valve of 2nd Embodiment of this invention. It is a principal part enlarged view of the non-return valve of FIG. It is a schematic sectional drawing of the check valve of 3rd Embodiment of this invention. It is a principal part enlarged view of the check valve of FIG. It is a schematic sectional drawing of the non-return valve of 4th Embodiment of this invention. It is a principal part enlarged view of the non-return valve of FIG. It is a schematic sectional drawing of the non-return valve of 5th Embodiment of this invention. It is a schematic sectional drawing of the conventional check valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fuel injection pump 4 ... Check valve 7 ... Fuel inflow passage 9 ... Fuel discharge passage 41 ... Valve seat member 42 ... Valve body 47 ... Valve body seat part 49 ... Valve seat sheet part 473, 474, 493d, 494, 495 ... Corner

Claims (6)

A valve seat member having a valve seat portion;
A valve body having a valve body seat portion that sits on and separates from the valve seat portion;
A check valve with
A check valve characterized in that a corner of the valve seat portion that contacts the valve seat portion is rounded. A valve seat member having a valve seat portion;
A valve body having a valve body seat portion that sits on and separates from the valve seat portion;
A check valve with
A check valve characterized in that a corner portion of the valve body seat portion that does not contact the valve seat seat portion in a state where the valve seat seat portion and the valve body seat portion are not worn is rounded. A valve seat member having a valve seat portion;
A valve body having a valve body seat portion that sits on and separates from the valve seat portion;
A check valve with
A check valve characterized in that a corner portion of the valve seat portion contacting the valve seat portion is rounded. A valve seat member having a valve seat portion;
A valve body having a valve body seat portion that sits on and separates from the valve seat portion;
A check valve with
A check valve having a rounded corner portion of the valve seat portion that does not contact the valve seat portion when the valve seat portion and the valve seat portion are not worn. A valve seat member having a valve seat portion;
A valve body having a valve body seat portion that sits on and separates from the valve seat portion;
A check valve with
A corner of the valve seat portion that contacts the valve seat portion;
In the state where the valve seat sheet portion and the valve body seat portion are not worn, a corner portion of the valve body seat portion that does not contact the valve seat seat portion,
A corner portion of the valve seat portion contacting the valve seat portion;
A corner portion of the valve seat portion that does not contact the valve seat portion when the valve seat portion and the valve seat portion are not worn,
A check valve characterized in that any two or more corners are rounded. A reciprocating movable member;
A pressurizing chamber in which expansion and contraction of the volume are repeated by reciprocating the movable member;
A fuel discharge passage for discharging fuel from the pressurizing chamber;
The check valve according to any one of claims 1 to 5, wherein the check valve is provided on an upstream side of the pressurizing chamber and includes a fuel inflow passage.
A fuel injection pump comprising:

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