JP2015161210A - fuel injection valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve both of: a structure allowing an anchor used in a fuel injection valve to make idle running; and suppression of a bound action at valve opening and suppression of secondary injection caused by a minute valve opening of a plunger rod upon a collision at valve closing.SOLUTION: An anchor is divided into two pieces. Each of the divided two pieces of the anchor has a magnetic attraction surface facing a fixed core. In the two divided pieces of the anchor, there are provided a first anchor energized by a spring energizing in a valve closing direction, and a second anchor energized toward the fixed core direction by an auxiliary spring energizing in a valve opening direction. The first anchor has a mass equal to or larger than a mass of the plunger rod.

Description

  The present invention relates to a fuel injection valve used in an internal combustion engine, and more particularly to an electromagnetic fuel injection valve that opens and closes a fuel injection valve by an electromagnetically driven mover.

  As a background art in this technical field, there is Japanese Patent No. 4603749 (Patent Document 1). According to this publication, “a movable part composed of two parts loaded by a first return spring and a valve closing body connected in a frictional connection to the larger movable part are provided, and the first movable part is "Fuel injection valve loaded by a first return spring in the closing direction and the second armature part loaded by a second return spring in the closing direction" is described (see summary). Moreover, there exists Unexamined-Japanese-Patent No. 2010-281248 (patent document 2). In this publication, “a fixed core provided with a through-hole that is a fuel passage in the center, a coil disposed on the outer peripheral side of the fixed core, an anchor facing the lower end of the fixed core, a lower end An electromagnetic fuel injection valve having a mover having a valve body formed thereon, and generating a magnetic attractive force by energizing the coil to attract the anchor and the mover to the fixed core The anchor and the mover are separate structures, and the center of the anchor is between the outer peripheral surface of the anchor and the inner peripheral surface of the large-diameter cylindrical portion that is a surface facing the outer peripheral surface of the anchor. The electromagnetic fuel injection valve is characterized in that the position is maintained and the inner peripheral surface of the large-diameter cylindrical portion is used as a guide portion when the anchor moves up and down.

Patent No. 4603749 JP 2010-281248 A

    The present invention relates to a mechanism for operating a valve of an electromagnetic fuel injection valve used in an internal combustion engine. Here, a fuel injection valve used for a spark ignition type internal combustion engine (gasoline engine) using gasoline or the like as the internal combustion engine will be described as an example.

  In a gasoline engine, it is necessary to adjust the amount of fuel according to the amount of air in order to adjust the output. The fuel injection valve adjusts the amount of fuel. A general electromagnetic fuel injection valve switches between a valve-open state and a valve-closed state depending on the presence / absence of energization, and adjusts the amount of fuel injection by adjusting the time of the valve-open state by the time of the injection command pulse. It is like that. In order to accurately inject an appropriate amount of fuel from the fuel injector, it is necessary to quickly open and close the valve body. However, when the fuel injector is opened or closed, the response due to the action of magnetic flux or fluid is required. Due to the delay, the opening and closing operation of the valve is completed with a delay from the time when the fuel injection control device truly opens and closes.

  Further, since the valve body cannot be stopped suddenly, for example, immediately after the displacement of the valve body reaches a predetermined value, the valve body is opened in a minute amount due to a collision phenomenon between the valve body and the fuel seat portion. Therefore, it becomes a factor that secondary injection occurs.

  In the conventional structure, the repulsive motion of the valve body after a valve closing collision is received only by the force of the spring urging the valve body in the valve closing direction, but the valve closing speed of the valve body increases as the operating fuel pressure increases. If it increases, the secondary injection preventing effect becomes small, and good injection characteristics cannot be obtained due to the influence of the secondary injection.

  As a prior art for this problem, the mover driven by the magnetic attraction force is configured to be able to move relative to the valve body that performs the on-off valve operation, and in a stationary state, the mover is biased in the valve closing direction. There is a fuel injection valve. In this fuel injection valve, in a stationary state, the mover is in a state of being provided with a stopper provided on the valve body and an end face on the valve closing side, and the end face on the valve opening side of the mover is not in contact with the valve body, It has a void. Due to the presence of this gap, when the fuel injection valve performs a valve closing operation, the mover runs idle without contacting the valve body, and then the valve opening end face of the mover and the stopper of the valve body The valve will start to open upon collision. Patent Document 1 is configured such that the movable element is further divided into two parts so that they can move relative to each other, and the divided movable element performs idle running operation even when the valve is closed, thereby speeding up the valve closing operation. A fuel injection valve is disclosed.

  In this way, by performing the valve closing operation in addition to the valve opening operation, the time required for valve closing can be shortened, and therefore, there is an effect of reducing the minimum injection amount.

  However, when the movable element is configured to be able to run idle, it is necessary to urge the movable element in the valve closing direction as in Patent Document 1.

  When the mover is urged in the valve closing direction, the force of the urging spring acts in the direction that promotes the bounce when the mover collides with the fixed core or stopper at the predetermined valve opening position. There is a problem that the bouncing action becomes large. As the bounce operation increases, the variation in the injection amount increases, and the minimum injection amount is affected.

  As described above, the problems to be solved by this research are that the anchor used for the fuel injection valve is configured to be able to run idle, the bounce operation at the time of valve opening is suppressed, and a minute opening of the plunger rod after the valve closing collision is suppressed. This is to achieve both suppression of secondary injection by the valve.

  In order to solve the above-mentioned problem, in the present invention, among the two divided anchors, a first anchor biased by a spring biasing in the valve closing direction and a biasing biased in the valve opening direction And a second anchor biased in the direction of the fixed core by the preliminary spring. The mass of the first anchor is equal to or greater than the mass of the plunger rod included in the first anchor.

  By shortening the time required for the on-off valve and suppressing the bounce operation after the valve closing collision, it is possible to suppress the secondary injection and improve the fuel injection accuracy.

It is an example of the block diagram of the fuel injection valve which concerns on this invention. It is sectional drawing of the fuel injection valve which concerns on this invention, Comprising: It is the figure which expanded the anchor vicinity of a valve closing state. It is sectional drawing of the fuel injection valve which concerns on this invention, Comprising: It is the figure which expanded the anchor vicinity of the valve opening state. It is the figure which represented typically the valve behavior of the fuel injection valve which concerns on this invention. It is sectional drawing of the fuel injection valve which concerns on this invention, Comprising: It is the figure which expanded the protrusion part of the anchor.

  Hereinafter, examples will be described with reference to FIGS.

FIG. 1 is an example of a configuration diagram of a fuel injection valve in the present embodiment.
The configuration of an embodiment of the fuel injection valve according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a fuel injection valve in the present embodiment. 2 and 3 are partially enlarged views of FIG. 1 and show the vicinity of an anchor in a valve closing state and a valve opening state.

  In the fuel injection valve shown in FIG. 1, the plunger rod 102 reciprocates straight by ON / OFF control by energization of the electromagnetic coil 108, and fuel is injected by opening and closing the gap with the valve seat 102 of the orifice cup. And stop. Since the plunger rod 102 is energized in the direction of the valve seat 102 by the spring 110 housed on the inner peripheral side of the fixed core 107 via the first anchor 105 in a state where current is not energized, the plunger rod 102 and the valve The gap between the seats 101 is closed.

  When the electromagnetic coil 108 is energized, a magnetic flux is generated between the fixed core 107 and the first anchor 105 and between the fixed core 107 and the second anchor 106, and the first anchor 105 and the second anchor 106. 106 is displaced to the upstream side of the fuel injection valve due to the influence of the magnetic attractive force. When the second anchor 106 is displaced upstream, the plunger rod 102 comes into contact with the plunger rod 102 after idle running and is displaced upstream. As a result, the plunger rod is separated from the valve seat, and the valve is opened.

  On the other hand, when the energization to the coil 108 is stopped, the magnetic flux generated in the fixed core 107 disappears, and the magnetic attractive force acting on the second anchor 106 and the first anchor 105 also decreases and disappears. To do. As a result, the first anchor 105 starts to move by the force transmitted from the spring 110, contacts the second anchor 106, and the first anchor 105 and the second anchor 106 are transmitted by the force transmitted when the contact is made. Is displaced downstream, and the plunger rod 102 is closed.

  The above is a description of the basic operation of the electromagnetic fuel injection valve. The fuel injection valve controls the fuel injection amount by controlling the time during which the plunger rod 102 is open by controlling the energization time to the electromagnetic coil 108.

  2 to 3 are enlarged sectional views of the vicinity of the second anchor 106 and the first anchor 105 in order to explain the on-off valve operation of the fuel injection valve according to the effect of the present invention.

  Here, the features, functions, and effects of the valve opening operation according to the present invention will be described with reference to FIG.

  In the fuel injection valve according to the present invention, the movable part that generates an attractive force by the magnetic flux generated in the fixed core 107 includes the second anchor 106 and the first anchor 105. The first anchor 105 is configured such that the downstream surface of the first anchor 105 and the upstream surface of the second anchor 106 can transmit forces to each other via the contact surface 204. When the fuel injection valve is in the closed state, the first anchor 105 is biased in the downstream direction by the spring 110. The second anchor 106 is urged toward the fixed core 107 on the upstream side by a preliminary spring 104 set to a force smaller than that of the spring 110, and the first anchor 105 and the second anchor 106 are Forces are acting in the direction of approaching each other.

  As described above, in a state where the first anchor 105 and the second anchor 106 are in contact with each other at the contact surface 204, the end surface of the first anchor 105 on the fixed core 107 side and the second anchor 106 on the fixed core 107 side. As for the position of the end face, the first anchor 105 is located on the downstream side, and there is an end face position difference 202.

  Further, in the valve closed state, the first anchor 105 is in contact with the plunger rod 102, and the force by the spring 110 acts in the valve closing direction of the plunger rod 102 via the first anchor 105.

In such a valve-closed state, a gap 201 exists at the position of the surface 205 where the second anchor 106 and the plunger rod 102 can abut. A gap 203 is formed between the second anchor 106 and the fixed core 107, and the gap 203 is set to be larger than the gap 201. When energization of the electromagnetic coil 108 is started, the gap 203 is fixed. Magnetic flux passes between the core 107 and the second anchor 106, and between the fixed core 107 and the first anchor 105, and a magnetic attractive force acts on the first anchor 105, the second anchor 106, and the mover 105. . In this state, since the magnetic flux passes from the cylindrical side surface of the first anchor 105 toward the inner diameter surface 206 of the second anchor 106, even if there are two movable parts that receive magnetic attraction force, A sufficient magnetic attractive force can be applied to the part. The inner diameter surface 206 of the second anchor 106 forms a sliding portion with the cylindrical side surface of the mover 105.

  Further, the first anchor 105 and the second anchor 106 are in contact with each other at the surface 205 in a valve-closed state, so that magnetic flux can pass therethrough. Thereby, even if a movable part is divided | segmented into two, magnetic flux passes through the 1st anchor 105, and sufficient magnetic attraction force can be made to act on each part.

  When the sum of the magnetic attractive forces acting on the second anchor 106 and the first anchor 105 exceeds the sum of the spring 110 force and the fuel pressure, the second anchor 106 and the first anchor 105 Start displacement in the direction. At this time, the direction in which the force by the auxiliary spring 104 urging the second anchor 106 acts is the direction of the fixed core 107, and the force by the auxiliary spring 104 and the force by the spring 110 are the second anchor 106. Since the second anchor 106 and the first anchor 105 are acted in the direction in which the first anchor 105 and the first anchor 105 approach each other, the second anchor 106 and the first anchor 105 are not separated from each other. For this reason, the second anchor 106 and the first anchor 105 start to move together in the direction of the fixed core 107.

  The movement of the second anchor 106 and the first anchor 105 at this time is performed in a state where there is no fuel flow, and is performed separately from the plunger rod 102 receiving the force due to the fuel pressure (free running) Motion), it is not affected by fuel pressure.

  When the displacement amount of the second anchor 106 reaches the size of the gap 201, the second anchor 106 abuts on the plunger rod 102 at the abutment surface 205 to transmit a force, and the plunger rod 102 is pulled up. At this time, since the second anchor 106 collides with the plunger rod 102 in a state where the second anchor 106 performs idle motion with the first anchor 105 and has kinetic energy, the plunger rod 102 starts to be displaced in the opening direction shockingly. .

  The fuel pressure is applied to the plunger rod 102, and the force due to the fuel pressure increases when the displacement of the plunger rod 102 is small and the pressure drop due to the Bernoulli effect caused by the fuel flow at the tip of the plunger rod 102 is large. It is. Since the opening of the plunger rod 102 is impacted by the idle running motion at the timing when the force due to the fuel pressure is increased and the valve opening operation becomes difficult, even in a state where a higher fuel pressure is acting. The valve opening operation can be performed. Alternatively, the spring 110 can be set to a stronger force for the fuel pressure range that needs to be operable. By setting the spring 110 to a stronger force, the time required for the valve closing operation described later can be shortened, which is effective for controlling the minute injection amount.

  After the plunger rod 102 starts the valve opening operation, the second anchor 106 collides with the fixed core 107. At this moment, since the first anchor 105 continues to move, the second anchor 106 and the first anchor 105 are separated from each other, and the force by the spring 110 is not transmitted to the second anchor 106.

  When the second anchor 106 collides with the fixed core 107, the second anchor 106 rebounds, but the second anchor 106 is attracted to the fixed core by the magnetic attraction acting on the second anchor 106, Stop before long. At this time, since a force acts on the second anchor 106 in the direction of the fixed core 107 by the auxiliary spring 104, the rebounding operation can be reduced. Since the rebounding action is small, the time during which the gap between the second anchor 106 and the fixed core 107 becomes large is shortened, and stable operation can be performed even with a smaller injection pulse width.

  The second anchor 106, the first anchor 105, and the plunger rod 102 that have finished the valve opening operation in this manner are stationary in the valve open state as shown in FIG. In the valve open state, a gap is formed between the plunger rod 102 and the valve seat 101, and fuel is injected. The fuel passes through the center hole provided in the fixed core 107, and passes from the fuel passage hole provided in the center of the first anchor 105 to the downstream direction through the fuel passage hole provided in the second anchor 106. It is going to flow. At this time, the flange portion of the plunger rod 102 is cut in three directions so that the flange portion of the plunger rod 102 does not serve as a throttle for the fuel passage.

  Next, the features, functions, and effects of the valve closing operation according to the present invention will be described with reference to FIG. In the valve open state shown in FIG. 3, the second anchor 106 and the first anchor 105 are separated from each other, and a gap 301 is generated. The size of the gap 301 matches the end face position difference 202.

  Even if the air gap 301 is generated in this way, the magnetic flux passing through the first anchor 105 passes through the inner diameter surface 206 of the second anchor 106 and enters the second core. Sufficient magnetic attractive force acting during 107 can be secured.

  In the opened state, the first anchor 105 and the plunger rod 102 are also separated from each other, and a gap 302 is formed between them. The size of the gap 302 is set to be larger than the gap 301. As described above, in order to make the first anchor 105 and the second anchor 106 stand still in a separated state, the magnetic attraction force generated between the fixed core 107 and the first anchor 105 is set to be larger than the force by the spring 110. The suction surfaces of the first anchor 105 and the second anchor 106 are increased so that the magnetic attractive force generated between the fixed core 107 and the second anchor 106 is larger than the force received by the fuel pressure. It is necessary to set the side area. Here, since the force received by the plunger rod 102 due to the fuel pressure is not transmitted to the first anchor 105, it is not necessary to set so that the magnetic attractive force acting on the first anchor 105 becomes excessively large. .

  Thus, in the state where the fuel injection valve is opened, the magnetic attractive force acting on the second anchor 106 takes over the force due to the fuel pressure acting on the plunger rod 102, and the first The valve opening state is maintained by a balance of forces in which the magnetic attractive force acting on the anchor 105 takes over the force of the spring 110.

  The lift amount of the plunger rod 102 from the valve seat 101 is determined by the valve closing of the contact surface 205 between the second anchor 106 and the plunger rod 102 from the gap 203 when the second anchor 106 and the fixed core 107 are closed. The height is obtained by subtracting the gap 201 in the state.

  When the energization of the electromagnetic coil 108 is stopped from the opened state, the magnetic flux generated in the fixed core 107 is reduced, and the magnetic attractive force acting on the second anchor 106 and the first anchor 105 is reduced. .

  When the magnetic attraction force acting on the first anchor 105 is less than the force by the spring 110 biasing the first anchor 105, the first anchor 105 starts to be displaced in the valve closing direction. When the magnetic attractive force acting on the second anchor 106 is lower than the force due to the fuel pressure applied to the plunger rod 102, the second anchor 106 starts to be displaced in the valve closing direction.

  Here, in the present invention, a value obtained by dividing the force of the spring 110 from the magnetic attractive force generated in the first anchor 105 (holding force of the first anchor 105) is obtained from the magnetic attractive force generated in the second anchor 106. By designing the suction area to be smaller than that obtained by dividing the force due to the fuel pressure applied to the plunger rod 102 (holding force of the second anchor 106), the first anchor 105 first moves in the valve closing direction. Can start. The force due to the fuel pressure attracts the second anchor 106 in the valve closing direction via the plunger rod 102, but this force is not transmitted to the first anchor 105, so the first anchor 105 does not depend on the fuel pressure. Instead, you can start exercising at the intended timing.

  Therefore, since the fuel pressure is low and the force in the valve closing direction due to the fuel pressure acting on the second anchor 106 is small, the same effect can be obtained even in a situation where it is difficult to start the valve closing operation.

In order to speed up the movement of the first anchor 105 and the second anchor 106 in the valve closing direction, as shown in FIG. 5, a protrusion 501 is formed at a portion where the first and second anchors and the fixed core 107 are in contact with each other. , 502 may be provided. As described above, by providing the first and second anchors with the protrusions 501 and 502, the magnetic attraction force is quickly attenuated, and the fuel existing in the gap between the first and second anchors and the fixed core 107 is obtained. As a result, the movement of the first and second anchors in the valve closing direction can be accelerated. The effect is the same even if any of these protrusions are provided on the fixed core 107 side. (Note that the end surface on the fixed core 107 side of the second anchor 106 or the first anchor 105 when the projection 501 or the projection 502 is provided in this way is a portion where the projection 501 or the projection 502 and the fixed core 107 are in contact with each other. Defined as the surface of
Thus, the method of providing the protrusion on the end face of the mover is generally performed in the fuel injection valve. In general, the height of the protrusion is selected from the trade-off relationship between the responsiveness of the mover and the magnetic attraction force obtained.

  After the first anchor 105 moves in the valve closing direction, the first anchor 105 collides with the contact surface 204 of the second anchor 106 and displaces the second anchor 106 in the valve closing direction. The first anchor 105 is idled by the force of the spring 110 until it collides with the second anchor 106. Since the gap 302 between the plunger rod 102 and the first anchor 105 is set larger than the gap 301 generated between the second anchor 106 and the first anchor 105, the first The anchor 105 contacts the second anchor 106 before contacting the plunger rod 102. Before the timing when the first anchor 105 collides, the second anchor 106 is attracted in the valve opening direction by the magnetic flux remaining in the fixed core 107, and between the fixed core 107 and the second anchor 106. Since the gap is narrow, it is difficult to displace in the valve closing direction due to the squeeze effect.

  According to the structure of the present invention, since the first anchor 105 collides with the second anchor 106 which is difficult to be displaced in the valve closing direction, the second anchor 106 quickly closes the valve. Can start. Further, the force due to the squeeze effect acting on the second anchor 106 and the magnitude of the magnetic attraction force have a property of rapidly decreasing as the distance between the second anchor 106 and the fixed core 107 increases. For this reason, when the second anchor 106 is shockedly separated from the fixed core 107 due to the collision of the first anchor 105 with the second anchor 106, the second anchor 106 can quickly move in the valve closing direction. .

  When the second anchor 106 starts the operation in the valve closing direction, the plunger rod 102 attracted in the valve closing direction by the fuel pressure also starts the valve closing operation.

  When the plunger rod 102 finally comes into contact with the valve seat 101, the second anchor 106 and the contact surface 204 of the plunger rod 102 are separated from each other, so that the second anchor 106 moves independently of the plunger rod 102. Become. Thus, the bounce operation caused by the collision between the plunger rod 102 and the valve seat 101 can be suppressed by separating the plunger rod 102 from the second anchor 106 at the moment of valve closing. This bounce suppression effect is obtained by separating the second anchor 106 from the plunger rod 102 at the moment when the plunger rod 102 collides with the valve seat 101, thereby converting the kinetic energy of the second anchor 106 into bounce energy. It is obtained by preventing being done.

  The first anchor 105 continues to move in the valve closing direction for the gap 302 generated in the first anchor 105 and the plunger rod 102 after the plunger rod 102 abuts the valve seat 101, and finally Abuts on the plunger rod 102. Here, in the structure of this research, the mass balance is set so that the mass of the first anchor 105 is equal to or greater than the mass of the plunger rod 102. As a result, the bouncing action that occurs when the plunger rod 102 collides with the valve seat 101 can be suppressed by the mass of the first anchor 105 or the force at the time of contact. In this way, secondary injection after the end of fuel injection due to the bounding action of the plunger rod is suppressed.

  FIG. 4 schematically shows the movement (valve behavior) of the plunger rod 102 obtained by the operation as described above. The solid line shows the valve behavior according to the present invention, and the broken line shows the valve behavior of a general fuel injection valve.

  According to the present invention, the valve opening behavior 401 of the plunger rod 102 is rapidly performed by the idling motion of the second anchor 106, and this effect allows the time during which the displacement amount of the valve body is small 401 ′. Less. Due to this effect, it is possible to suppress coarse droplets generated by the fuel flowing out at a low speed.

  Further, after the valve body 102 reaches the predetermined lift position and opens, the bounce behavior 403 after the second anchor 106 collides with the fixed core 107 can be reduced as compared with a general fuel injection valve. .

  As for the behavior 403 of the plunger rod 102 when the valve is closed, the plunger rod 102 performs the valve closing operation because the first anchor 105 collides with the movable element 104 after the idle running motion and the valve closing operation is started. The speed increases and the time required for the valve closing operation can be shortened.

  Further, the post-valve movement 404 after the plunger rod 102 abuts on the valve seat 101 has no secondary valve displacement because the first anchor 105 suppresses the bounding motion of the plunger rod 102, and there is no secondary valve displacement. Next injection can be suppressed.

  In this way, since the delay time is small with respect to the injection pulse and stable operation is possible, the operation in a short injection period can be stably performed with a short injection pulse, and a small minimum injection amount Can be obtained.

DESCRIPTION OF SYMBOLS 100 Fuel-injection apparatus 101 Valve seat 102 Plunger rod 103 Nozzle holder 104 Preliminary spring 105 First anchor 106 Second anchor 107 Fixed core 108 Electromagnetic coil 109 Terminal 110 Spring 111 Housing 200 Closed valve enlarged view 201 Air gap 202 First, Second anchor end face position difference 203 Gap 204 Abutting surface 205 Abutting surface 206 Second anchor inner diameter surface 300 Opening state enlarged view 301 Gap 302 Gap 303 Abutting surface 400 Valve behavior schematic diagram 401 Valve opening behavior 402 Opening bound operation 403 Closing behavior 404 Post-closing operation 500 Anchor enlarged view 501 First anchor projection 502 Second anchor projection

Claims (5)

A cylindrical anchor, a plunger rod located at the center of the anchor, a movable element including a valve body provided at the tip of the plunger rod, and a fuel introduction hole for guiding fuel to the center portion A fixed core; and an electromagnetic coil for supplying a magnetic flux to a magnetic path including a magnetic gap provided between an end face of the anchor and an end face of the fixed core, and the end face of the anchor and the fixed portion are fixed by the magnetic flux passing through the magnetic gap. In the fuel injection valve that opens the fuel passage by pulling the valve element away from the valve seat by driving the mover by attracting the anchor to the fixed core side by a magnetic attraction generated between the end face of the core,
The anchor is divided into two, and each of the two divided anchors has a magnetic attraction surface facing the fixed core, and urges in the valve closing direction among the two divided anchors. A first anchor biased by a spring and a second anchor biased in the direction of the fixed core by a preliminary spring biased in the valve opening direction; and the mass of the first anchor Is configured to be equal to or greater than the mass of the plunger rod.   2. The fuel injection valve according to claim 1, wherein a sum of masses of the first anchor and a spring for biasing the first anchor in a valve closing direction is equal to or greater than a mass of the plunger rod. A fuel injection valve. 3. The fuel injection valve according to claim 1, wherein the first anchor contacts the valve body when the valve is in a closed state, and the force of the spring is transmitted to the valve body. Fuel injection valve.   In the fuel injection valve according to any one of claims 1, 2, and 3, in the closed state, the first anchor and the second anchor are separated by the contact surface, and the valve is in the closed state. The fuel injection valve is characterized in that the first process is performed when the first anchor contacts the second anchor at the contact surface.   5. The fuel injection valve according to claim 4, wherein a collar portion of the plunger rod is enclosed by the first anchor and the second anchor.