JP7070343B2 - Solenoid valve and high-pressure pump using it - Google Patents

Description

The present invention relates to a solenoid valve and a high-pressure pump using the solenoid valve.

Conventionally, a high-pressure pump to which an electromagnetic valve for controlling the valve member of a suction passage by an electromagnetic drive unit for opening the valve is known. In the high-pressure pump of Patent Document 1, when the energization to the electromagnetic drive portion is stopped during valve opening control, the needle moves in the valve opening direction together with the valve member, and the valve member collides with the stopper portion. At this time, unpleasant noise is generated due to the vibration of the needle, the valve member, and the stopper portion.

Japanese Unexamined Patent Publication No. 2015-21428

In the high-pressure pump of Patent Document 1, after the energization to the electromagnetic drive unit is stopped during valve opening control, the electromagnetic drive unit is temporarily re-energized before the needle reaches the open side position. As a result, the moving speed of the needle in the valve opening direction is reduced, and the collision force between the needle, the valve member, and the stopper portion is reduced. As a result, noise due to vibration of the needle, valve member and stopper can be reduced.

In the high-pressure pump of Patent Document 1, although the noise can be reduced as a whole by the above-mentioned control, there is a possibility that a jarring high-frequency sound remains. Further, when the moving speed of the needle in the valve opening direction is further reduced for the purpose of further reducing the collision force between the needle, the valve member, and the stopper portion, the responsiveness may deteriorate.

An object of the present invention is to provide a solenoid valve and a high pressure pump capable of suppressing the generation of high frequency noise during operation.

A first aspect of the solenoid valve according to the present invention includes a pressurizing chamber forming portion, a suction passage forming portion, a seat portion, a valve member, a stopper portion, a needle, a movable core, an electromagnetic driving portion, and a needle urging member. There is. The pressurizing chamber forming portion forms a pressurizing chamber in which the fluid is pressurized. The suction passage forming portion forms a suction passage through which the fluid sucked into the pressurizing chamber flows. The seat portion is provided in the suction passage and has a communication passage that communicates one surface with the other surface. The valve member is provided on the pressurizing chamber side of the seat portion, and can allow or regulate the flow of fluid in the communication passage by opening the valve apart from the seat portion or by contacting the seat portion and closing the valve.

The stopper portion is provided on the pressurizing chamber side with respect to the seat portion, and the movement of the valve member in the valve opening direction can be regulated by contacting the surface of the valve member on the pressurizing chamber side. The needle is provided so as to be able to reciprocate in the axial direction and one end thereof to be in contact with the surface of the valve member opposite to the pressurizing chamber. The movable core is provided on the needle. The electromagnetic drive unit can attract the movable core together with the needle in the valve closing direction or the valve opening direction by energization. The needle urging member urges the needle in the valve opening direction or the valve closing direction.

The needle is set to have an axial rigidity so that the resonance frequency is 20 kHz or less. As a result, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

In the second aspect of the solenoid valve according to the present invention, the needle is a needle body provided with a movable core, a needle end portion formed on the valve member side of the needle body so as to be in contact with the valve member, and a needle. It has a needle recess formed so as to be radially inwardly recessed from the outer wall of the needle end in the entire circumferential range of the end. Therefore, the rigidity of the needle end portion is relatively low in the needle recess, and the time during which the needle, the valve member, and the stopper portion collide with each other when the valve member is opened can be lengthened. As a result, the maximum value of the collision force between the needle, the valve member, and the stopper portion can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

In the third aspect of the solenoid valve according to the present invention, the stopper portion has a stopper contact surface capable of contacting the outer edge portion of the surface of the valve member on the pressurizing chamber side. The valve member is formed so that the plate thickness is 0.5 mm or more and 0.75 mm or less. Therefore, the rigidity of the valve member is relatively low, and the time during which the needle, the valve member, and the stopper portion collide with each other when the valve member is opened can be lengthened. As a result, the maximum value of the collision force between the needle, the valve member, and the stopper portion can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

In the fourth aspect of the solenoid valve according to the present invention, the stopper portion is a cylindrical stopper cylinder portion, a stopper bottom portion that closes the end portion of the stopper cylinder portion on the pressurizing chamber side, and a side opposite to the pressurizing chamber from the stopper bottom portion. It has a stopper convex portion that protrudes toward the surface, and a stopper contact surface that is formed on the stopper convex portion and is capable of contacting the surface of the valve member on the pressurizing chamber side. The bottom of the stopper is formed so that the plate thickness is 0.5 mm or more and 0.74 mm or less. Therefore, the rigidity of the stopper bottom portion is relatively low, and the time during which the needle, the valve member, and the stopper portion collide with each other when the valve member is opened can be lengthened. As a result, the maximum value of the collision force between the needle, the valve member, and the stopper portion can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

In the fifth aspect of the solenoid valve according to the present invention, the valve member is divided into a plurality of parts in the circumferential direction and arranged in an annular shape, and the outer valve portion having the inner peripheral wall formed in a tapered shape and one end of the needle can come into contact with each other. The diameter of the inner valve portion and the outer valve portion, which are provided on the side opposite to the pressurizing chamber with respect to the center of the outer valve portion and are formed in a tapered shape so that the outer peripheral wall can slide with the inner peripheral wall of the outer valve portion. It has an inwardly urging portion, and when the inner valve portion moves in the valve opening direction, the outer peripheral wall of the inner valve portion slides with the inner peripheral wall of the outer valve portion, and a plurality of outer valves are used. The part moves in the out-of-diameter direction. As a result, when the inner valve portion is pushed by the needle and moves in the valve opening direction when the valve member is opened, the outer peripheral wall of the inner valve portion slides with the inner peripheral wall of the outer valve portion, and a plurality of outer valve portions are formed. Moves in the out-of-diameter direction against the urging force of the in-diameter urging portion. Therefore, it is possible to prolong the time during which the needle, the valve member, and the stopper portion collide with each other. As a result, the maximum value of the collision force between the needle, the valve member, and the stopper portion can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

Schematic cross-sectional view showing a solenoid valve and a high pressure pump according to the first embodiment. FIG. 3 is a cross-sectional view showing a valve member of a solenoid valve of a high-pressure pump according to the first embodiment and its vicinity. (A) is a graph showing the change in the magnitude of the collision force with the passage of time between the solenoid valve according to the first embodiment and the conventional solenoid valve, and (B) is the solenoid valve according to the first embodiment and the conventional solenoid valve. A graph showing the relationship between the magnitude of the collision force and the height of the frequency. (A) is a graph showing the relationship between the magnitude of the collision force and the frequency height due to the difference in the outer diameter of the needle end, and (B) is a graph showing the relationship between the size of the outer diameter of the needle end and the frequency height. .. FIG. 2 is a cross-sectional view showing a valve member of a solenoid valve of a high-pressure pump according to a second embodiment and its vicinity. FIG. 3 is a cross-sectional view showing a valve member of a solenoid valve of a high-pressure pump according to a third embodiment and its vicinity. The graph which shows the relationship between the size of the plate thickness of a valve member and the height of a frequency. FIG. 6 is a cross-sectional view showing a valve member of a solenoid valve of a high-pressure pump according to a fourth embodiment and its vicinity. A graph showing the relationship between the size of the plate thickness at the bottom of the stopper and the height of the frequency. FIG. 5 is a cross-sectional view showing a valve member in a closed state of the solenoid valve of the high-pressure pump according to the fifth embodiment and its vicinity. (A) is a cross-sectional view showing a valve member of a solenoid valve of a high-pressure pump according to a fifth embodiment, and (B) is a view of (A) seen from the direction of arrow XIB. FIG. 5 is a cross-sectional view showing a valve member in an open state of the solenoid valve of the high-pressure pump according to the fifth embodiment and its vicinity.

Hereinafter, solenoid valves and high-pressure pumps according to a plurality of embodiments will be described with reference to the drawings. In the plurality of embodiments, substantially the same constituent parts are designated by the same reference numerals, and the description thereof will be omitted. Further, substantially the same constituent sites in a plurality of embodiments have the same or similar effects.

(First Embodiment)
FIG. 1 shows a solenoid valve according to the first embodiment and a high-pressure pump using the solenoid valve. The high-pressure pump 1 is applied to a fuel supply system that supplies fuel to an internal combustion engine of a vehicle (not shown). The high-pressure pump 1 is attached to, for example, an engine head of an internal combustion engine. Here, the internal combustion engine is, for example, a gasoline engine. Therefore, the high-pressure pump 1 supplies gasoline as fuel to the internal combustion engine. Here, the fuel corresponds to the "fluid".

The high-pressure pump 1 includes a housing 20, a plunger 11, a solenoid valve 10, and the like. The solenoid valve 10 includes a seat portion 30, a valve member 40, a stopper portion 50, a needle 60, a movable core 70, an electromagnetic drive portion 80, a needle urging member 91, and the like.

The housing 20 has a housing main body 21, an inlet portion 22, a discharge portion 23, a discharge valve 24, and the like. The housing body 21 is made of, for example, metal. The housing main body 21 has a pressurizing chamber 200, a suction passage 201, a discharge passage 202, and the like as spaces. The pressurizing chamber 200 is formed in a substantially cylindrical shape inside the housing main body 21. The suction passage 201 is formed in the housing body 21 so that one end thereof communicates with the pressurizing chamber 200. The discharge passage 202 is formed in the housing main body 21 so that one end communicates with the pressurizing chamber 200. Here, the housing body 21 of the housing 20 corresponds to the "pressurizing chamber forming portion" and the "suction passage forming portion".

The inlet portion 22 is formed so as to protrude in a cylindrical shape from the housing main body 21. The space inside the inlet portion 22 communicates with the suction passage 201. A fuel pump (not shown) is connected to the inlet portion 22. As a result, the fuel discharged from the fuel pump flows into the inlet portion 22. The fuel that has flowed into the inlet portion 22 can flow into the pressurizing chamber 200 via the suction passage 201.

The discharge portion 23 is formed so as to protrude in a cylindrical shape from the housing main body 21. The space inside the discharge portion 23 communicates with the discharge passage 202. A fuel rail (not shown) is connected to the discharge unit 23. As a result, the fuel flowing out of the pressurizing chamber 200 is discharged from the high-pressure pump 1 via the discharge passage 202 and the discharge unit 23, and flows into the fuel rail. The fuel that has flowed into the fuel rail is injected and supplied to the internal combustion engine from a fuel injection valve (not shown).

The discharge valve 24 is provided inside the discharge portion 23. The discharge valve 24 allows the flow of fuel from the discharge passage 202 side to the fuel rail side, and regulates the flow of fuel from the fuel rail side to the discharge passage 202 side.

The plunger 11 is formed of, for example, a metal in a substantially columnar shape. The plunger 11 is provided in the housing main body 21 so that one end side can reciprocate in the axial direction in the pressurizing chamber 200. The other end of the plunger 11 protrudes from the housing body 21. A spring seat 12 is provided at the other end of the plunger 11. A spring 13 is provided between the spring seat 12 and the housing body 21. The spring 13 is, for example, a coil spring, and urges the plunger 11 in a direction in which the plunger 11 exits the pressurizing chamber 200.

The high-pressure pump 1 is attached to the internal combustion engine so that the other end of the plunger 11 or the spring seat 12 abuts on the cam 3 of the camshaft 2. As a result, when the camshaft 2 rotates, the plunger 11 reciprocates in the axial direction. At this time, the volume of the pressurizing chamber 200 increases or decreases according to the reciprocating movement of the plunger 11.

The sheet portion 30 is formed of, for example, metal in a substantially disk shape. The seat portion 30 is provided in the suction passage 201. Specifically, the seat portion 30 is fixed to the inner wall of the housing body 21 forming the suction passage 201. As shown in FIG. 2, the seat portion 30 has an inner aisle 301, an outer aisle 302, a valve seat 300, and the like as aisle.

One inner communication passage 301 is formed in the seat portion 30 so as to communicate the center of one surface of the seat portion 30 and the center of the other surface. The outer communication passage 302 is formed in the seat portion 30 so as to communicate one surface of the seat portion 30 with the other surface. A plurality of outer aisles 302 are formed at equal intervals in the circumferential direction of the seat portion 30 on the radial outer side of the inner aisle 301. The valve seat 300 is formed in an annular shape around the inner communication passage 301 and around the outer communication passage 302 on the surface of the seat portion 30 on the pressurizing chamber 200 side.

The valve member 40 has a valve body 400. The valve body 400 is formed of, for example, metal in a substantially disk shape. The valve member 40 is provided on the pressurizing chamber 200 side with respect to the seat portion 30 in the suction passage 201. The valve member 40 can reciprocate in the axial direction so that one surface of the valve body 400 is separated from the valve seat 300 of the seat portion 30 or abuts on the valve seat 300 of the seat portion 30. The valve member 40 can allow or regulate the flow of fuel in the inner communication passage 301 and the outer communication passage 302 by opening the valve apart from the seat portion 30 or by contacting and closing the valve with the seat portion 30.

The valve body 400 has a valve connecting passage 401 and a tapered surface 402. The valve communication passage 401 is formed in the valve body 400 so as to communicate the surface of the valve body 400 on the seat portion 30 side and the surface of the pressure chamber 200 side. The valve aisle 401 is formed so as to be located between the inner aisle 301 and the outer aisle 302 in the radial direction of the seat portion 30. A plurality of valve communication passages 401 are formed at equal intervals in the circumferential direction of the valve body 400. The tapered surface 402 is formed on the outer edge of the surface of the valve body 400 on the pressure chamber 200 side. The tapered surface 402 is formed in a tapered shape so as to move away from the axis of the valve body 400 toward the seat portion 30 side from the pressurizing chamber 200 side.

The stopper portion 50 is made of, for example, metal. The stopper portion 50 is provided on the pressurizing chamber 200 side with respect to the seat portion 30 in the suction passage 201. Specifically, the stopper portion 50 is fixed to the inner wall of the housing body 21 forming the suction passage 201.

The stopper portion 50 has a stopper cylinder portion 51, a stopper bottom portion 52, a stopper convex portion 53, a stopper contact surface 54, and the like. The stopper cylinder portion 51 has a large diameter cylinder portion 511 and a small diameter cylinder portion 512. The large-diameter tubular portion 511 is formed in a substantially cylindrical shape. The small-diameter tubular portion 512 is formed in a substantially cylindrical shape. The small-diameter cylinder portion 512 is integrally formed with the large-diameter cylinder portion 511 so as to be coaxial with the large-diameter cylinder portion 511. The inner diameter of the small diameter cylinder portion 512 is smaller than the inner diameter of the large diameter cylinder portion 511, and the outer diameter of the small diameter cylinder portion 512 is the same as the outer diameter of the large diameter cylinder portion 511.

In the stopper portion 50, the small diameter cylinder portion 512 is located on the pressurizing chamber 200 side with respect to the large diameter cylinder portion 511, and the outer peripheral walls of the large diameter cylinder portion 511 and the small diameter cylinder portion 512 form the suction passage 201. The suction passage 201 is provided so as to abut on the inner wall of the. The end surface of the large-diameter cylinder portion 511 opposite to the small-diameter cylinder portion 512 is in contact with the outer edge portion of the end surface of the seat portion 30 on the pressurizing chamber 200 side.

The stopper bottom portion 52 is formed in a plate shape integrally with the stopper cylinder portion 51 so as to close the end portion of the stopper cylinder portion 51 on the pressurizing chamber 200 side. Specifically, the stopper bottom portion 52 is integrally formed with the stopper cylinder portion 51 so as to close the end portion of the small diameter cylinder portion 512 on the pressurizing chamber 200 side.

The stopper convex portion 53 is integrally formed with the stopper bottom portion 52 so as to project substantially in a columnar shape from the center of the stopper bottom portion 52 to the side opposite to the pressurizing chamber 200. The stopper contact surface 54 is formed on the end surface of the stopper convex portion 53 on the side opposite to the stopper bottom portion 52. The position of the stopper cylinder portion 51 of the stopper contact surface 54 in the axial direction is substantially the same as the position of the annular stepped surface 513 between the large diameter cylinder portion 511 and the small diameter cylinder portion 512.

The stopper bottom portion 52 has a stopper connecting passage 501. The stopper communication passage 501 is formed so as to communicate the surface of the stopper bottom portion 52 on the seat portion 30 side and the surface on the pressurizing chamber 200 side on the radial outer side of the stopper convex portion 53. A plurality of stopper communication passages 501 are formed at equal intervals in the circumferential direction of the stopper bottom portion 52.

The valve member 40 is provided so as to be reciprocally movable between the surface of the seat portion 30 on the pressurizing chamber 200 side and the stopper contact surface 54 inside the stopper cylinder portion 51 of the stopper portion 50. When the center of the surface of the valve body 400 on the pressure chamber 200 side abuts on the stopper contact surface 54, the valve member 40 is restricted from moving in the valve opening direction. In this way, the stopper portion 50 can regulate the movement of the valve member 40 in the valve opening direction by abutting on the surface of the valve member 40 on the pressure chamber 200 side.

The needle 60 is made of, for example, metal. The needle 60 has a needle body 61, a needle end portion 62, a needle large diameter portion 63, a spring seat portion 64, and the like. The needle body 61 is formed in a substantially columnar shape. The needle end 62 is formed in a substantially columnar shape, and is integrally formed with the needle body 61 so as to be coaxial with the needle body 61. The outer diameter of the needle end 62 is smaller than the outer diameter of the needle body 61.

The needle large diameter portion 63 is formed in a substantially cylindrical shape on the radial outer side of the end portion of the needle body 61 on the needle end 62 side. The outer diameter of the needle large diameter portion 63 is larger than the outer diameter of the needle body 61. The spring seat portion 64 is formed in a substantially annular shape on the radial outer side of the end portion of the needle large diameter portion 63 on the needle end portion 62 side. The outer diameter of the spring seat portion 64 is larger than the outer diameter of the needle large diameter portion 63.

The needle 60 is provided in the suction passage 201 so that the needle 60 can reciprocate in the axial direction and the needle end 62 at one end can come into contact with the surface of the valve member 40 opposite to the pressurizing chamber 200. Here, the needle end portion 62 is inserted into the inner passage 301 of the seat portion 30. The axial length of the needle end 62 is larger than the axial length of the inner communication passage 301. Further, in a state where the surface of the valve member 40 on the pressure chamber 200 side is in contact with the stopper contact surface 54 and the needle end 62 is in contact with the surface of the valve member 40 on the side opposite to the pressure chamber 200, the needle The spring seat portion 64 of 60 is separated from the seat portion 30 (see FIG. 2).

The movable core 70 is formed in a substantially cylindrical shape by, for example, a magnetic material. The movable core 70 is provided on the radial outer side of the end portion of the needle body 61 opposite to the needle end portion 62. The movable core 70 is fixed to the needle body 61. Therefore, the movable core 70 can reciprocate in the axial direction integrally with the needle 60.

A guide portion 90 is provided between the movable core 70 and the needle large diameter portion 63 on the radial outer side of the needle body 61. The guide portion 90 is formed of, for example, a metal in a substantially annular shape. The guide portion 90 is fixed to the housing main body 21 so that the outer peripheral wall abuts on the inner wall of the housing main body 21 forming the suction passage 201. The inner peripheral wall of the guide portion 90 is slidable with the outer peripheral wall of the needle body 61. As a result, the guide portion 90 can guide the reciprocating movement of the needle 60 in the axial direction.

The electromagnetic drive unit 80 is provided on the housing main body 21 on the side opposite to the pressurizing chamber 200 with respect to the guide unit 90. The electromagnetic drive unit 80 has a fixed core 81, a coil 82, and the like. The fixed core 81 is formed in a substantially columnar shape by, for example, a magnetic material. The fixed core 81 is fixed to the housing main body 21 on the side opposite to the pressurizing chamber 200 with respect to the movable core 70. The coil 82 is formed in a substantially cylindrical shape and is provided on the radial outer side of the fixed core 81.

The needle urging member 91 is, for example, a coil spring, and is provided on the radial outer side of the needle body 61 and the needle large diameter portion 63 so that one end abuts on the spring seat portion 64 and the other end abuts on the guide portion 90. There is. The needle urging member 91 urges the needle 60 toward the pressurizing chamber 200, that is, in the valve opening direction. The inside of the end portion of the needle urging member 91 on the spring seat portion 64 side can come into contact with the outer peripheral wall of the needle large diameter portion 63.

A valve urging member 92 is provided between the valve member 40 and the stopper bottom portion 52. The valve urging member 92 is, for example, a coil spring, and is provided on the radial outer side of the stopper convex portion 53 so that one end abuts on the stopper bottom portion 52 and the other end abuts on the valve member 40. The valve urging member 92 urges the valve member 40 on the side opposite to the pressurizing chamber 200, that is, in the valve closing direction. The urging force of the valve urging member 92 is smaller than the urging force of the needle urging member 91.

When the coil 82 is energized by an electronic control unit (not shown), a suction force is generated between the fixed core 81 and the movable core 70. As a result, the movable core 70 moves together with the needle 60 on the opposite side of the pressurizing chamber 200, that is, in the valve closing direction, against the urging force of the needle urging member 91. When the movable core 70 further moves in the valve closing direction together with the needle 60, the valve member 40 moves in the valve closing direction due to the urging force of the valve urging member 92 or the like, and abuts on the valve seat 300 of the seat portion 30 to close the valve. ..

When the energization of the coil 82 is stopped while the valve member 40 is closed, the suction force between the fixed core 81 and the movable core 70 disappears, and the movable core 70 and the needle 60 are attached to the needle urging member 91. It moves in the valve opening direction by the force. As a result, the valve member 40 is pushed in the valve opening direction by the needle end 62, and is separated from the valve seat 300 to open the valve. When the movable core 70 and the needle 60 further move in the valve opening direction, the valve member 40 collides with the stopper contact surface 54. As a result, the movement of the valve member 40 in the valve opening direction is restricted (see FIG. 2).

In the present embodiment, when the coil 82 is not energized, the valve member 40 is pushed in the valve opening direction by the needle 60, opens, and is in contact with the stopper contact surface 54 (see FIG. 2). .. As described above, in the present embodiment, the valve member 40, the needle 60, the electromagnetic drive unit 80, and the needle urging member 91 constitute a so-called normally open type valve device.

In the present embodiment, when the valve member 40 is open, the fuel is passed through the valve connecting passage 401 or between the outer edge portion of the valve body 400 and the inner peripheral wall of the stopper cylinder portion 51, and the valve member. It is possible to go back and forth between the seat portion 30 side with respect to 40 and the pressurizing chamber 200 side with respect to the valve member 40 (see FIG. 2).

Next, the configuration of the needle end 62 will be described in detail. In the present embodiment, assuming that the outer diameter of the needle end 62 is D1 and the axial length of the needle end 62 is L1, the needle end 62 is 1 / 7.4 ≦ D1 / L1 ≦ 1.06 /. It is formed to satisfy the relationship of 7.4. More specifically, the needle end 62 is formed so that the outer diameter is 1 mm or more and 1.06 mm or less. More specifically, the needle end 62 is formed so that the length in the axial direction is about 7.4 mm.

In the present embodiment, the needle end 62 is formed so as to satisfy the relationship of 1 / 7.4 ≦ D1 / L1 ≦ 1.06 / 7.4, so that the rigidity is relatively low. Therefore, when the valve member 40 collides with the stopper contact surface 54 of the stopper portion 50 when the valve member 40 is opened, the needle end portion 62 is elastically deformed. As a result, the time during which the needle 60, the valve member 40, and the stopper portion 50 collide with each other can be lengthened. As a result, the maximum value of the collision force between the needle 60, the valve member 40, and the stopper portion 50 can be reduced as compared with the case of the conventional needle end portion 62 satisfying the relationship of D1 / L1> 1.06 / 7.4 (as a result). See FIG. 3 (A)). In addition, the collision force of a particularly high frequency can be reduced, and the noise of a high frequency that is offensive to the ear can be reduced (see FIG. 3B).

FIG. 4A shows the relationship between the collision force and the frequency when the outer diameters of the needle end 62 are 1.8 mm, 1.0 mm, and 0.5 mm, respectively. As shown in FIG. 4A, a drop in collision force occurs at a frequency three times the resonance frequency of each needle end 62 having a different outer diameter. The relationship between the frequency at which this drop occurs and the outer diameter of the needle end 62 is plotted as shown in FIG. 4 (B). In the present embodiment, based on the graph of FIG. 4B, the needle end is configured to have both the strength limit of the needle end 62 (outer diameter of 1 mm or more) and the target frequency of generated noise (20 kHz or less). The axial length of the portion 62 is about 7.4 mm, the outer diameter is 1 mm or more, and 1.06 mm or less, that is, the relationship of 1 / 7.4 ≦ D1 / L1 ≦ 1.06 / 7.4. It is formed to satisfy. In the present embodiment, the needle 60 is set to have an axial rigidity so that the resonance frequency is 20 kHz or less.

Next, the operation of the high-pressure pump 1 will be described with reference to FIGS. 1 and 2.

"Inhalation process"
When the energization of the coil 82 of the electromagnetic drive unit 80 is stopped, the valve member 40 is urged toward the pressurizing chamber 200 by the needle urging member 91 and the needle 60. Therefore, the valve member 40 is separated from the valve seat 300, that is, the valve is opened. When the plunger 11 moves to the cam 3 side in this state, the volume of the pressurizing chamber 200 increases, and the fuel on the side opposite to the pressurizing chamber 200 with respect to the valve seat 300 is the inner communication passage 301 and the outer communication passage 302. It is sucked into the pressurizing chamber 200 side via.

"Measuring process"
When the plunger 11 moves to the side opposite to the cam 3 with the valve member 40 opened, the volume of the pressurizing chamber 200 decreases, and the fuel on the pressurizing chamber 200 side with respect to the valve seat 300 is the valve seat 300. On the other hand, it is returned to the side opposite to the pressurizing chamber 200. When the coil 82 is energized during the metering process, the movable core 70 is sucked toward the fixed core 81 together with the needle 60, and the valve member 40 is urged by the valve urging member 92 to abut on the valve seat 300 and close the valve. When the plunger 11 moves to the side opposite to the cam 3, by closing the valve member 40, the amount of fuel returned from the pressure chamber 200 side to the valve seat 300 to the side opposite to the pressure chamber 200 is increased. It will be adjusted. As a result, the amount of fuel to be pressurized in the pressurizing chamber 200 is determined. When the valve member 40 closes, the metering step of returning the fuel from the pressurizing chamber 200 to the valve seat 300 on the side opposite to the pressurizing chamber 200 is completed.

When the fuel injection valve does not inject fuel, that is, when the fuel is cut, the coil 82 is not energized and the fuel discharge from the high pressure pump 1 is 0. At this time, since the valve member 40 is in the opened state, the fuel in the pressurizing chamber 200 is on the side opposite to the pressurizing chamber 200 with respect to the pressurizing chamber 200 and the valve seat 300 due to the reciprocating movement of the plunger 11. Go back and forth between.

"Pressurization process"
When the plunger 11 further moves to the side opposite to the cam 3 with the valve member 40 closed, the volume of the pressurizing chamber 200 decreases, and the fuel in the pressurizing chamber 200 is compressed and pressurized. When the pressure of the fuel in the pressurizing chamber 200 becomes equal to or higher than the valve opening pressure of the discharge valve 24, the discharge valve 24 opens and the fuel is discharged from the pressurizing chamber 200 to the fuel rail side.

When the energization to the coil 82 is stopped and the plunger 11 moves to the cam 3 side, the valve member 40 opens again. As a result, the pressurizing step of pressurizing the fuel is completed, and the suction step in which the fuel is sucked into the pressurizing chamber 200 from the side opposite to the pressurizing chamber 200 with respect to the valve seat 300 is restarted.

By repeating the above-mentioned "suction step", "measuring step", and "pressurization step", the high pressure pump 1 pressurizes and discharges the fuel sucked into the pressurizing chamber 200 and supplies it to the fuel rail. The amount of fuel supplied from the high-pressure pump 1 to the fuel rail is adjusted by controlling the energization timing of the coil 82 of the electromagnetic drive unit 80 and the like.

At the end of the pressurizing process, when the energization to the coil 82 is stopped and the valve member 40 opens again, the needle 60 and the valve member 40 move in the valve opening direction, and the needle end 62, the valve member 40, and the stopper portion. Collision with 50. In the present embodiment, at this time, the high-frequency collision force can be reduced, and the harsh high-frequency noise can be reduced. Further, in the present embodiment, as in the prior art of Patent Document (Japanese Patent Laid-Open No. 2015-21428), the coil 82 is energized for the purpose of reducing the collision force between the needle 60, the valve member 40 and the stopper portion 50. It is not necessary to control the movement speed of the needle 60 in the valve opening direction, so that deterioration of responsiveness can be suppressed.

As described above, (1) the solenoid valve 10 of the present embodiment has a housing 20 as a pressure chamber forming portion and a suction passage forming portion, a seat portion 30, a valve member 40, a stopper portion 50, a needle 60, and a movable core. It includes a 70, an electromagnetic drive unit 80, and a needle urging member 91. The housing 20 forms a pressurizing chamber 200 to which fuel is pressurized. The housing 20 forms a suction passage 201 through which fuel sucked into the pressurizing chamber 200 flows. The seat portion 30 is provided in the suction passage 201 and has an inner communication passage 301 and an outer communication passage 302 as communication passages communicating one surface and the other surface. The valve member 40 is provided on the pressurizing chamber 200 side of the seat portion 30, and is separated from the seat portion 30 to open the valve, or abuts on the seat portion 30 and closes to close the valve in the inner communication passage 301 and the outer communication passage 302. Fuel flow can be tolerated or regulated.

The stopper portion 50 is provided on the pressurizing chamber 200 side with respect to the seat portion 30, and the movement of the valve member 40 in the valve opening direction can be restricted by contacting the surface of the valve member 40 on the pressurizing chamber 200 side. The needle 60 is provided so as to be able to reciprocate in the axial direction and one end of the needle 60 to be in contact with the surface of the valve member 40 opposite to the pressurizing chamber 200. The movable core 70 is provided on the needle 60. The electromagnetic drive unit 80 can attract the movable core 70 together with the needle 60 in the valve closing direction or the valve opening direction by energization. The needle urging member 91 urges the needle 60 in the valve opening direction or the valve closing direction. The needle 60 is set to have an axial rigidity so that the resonance frequency is 20 kHz or less. As a result, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

(2) In the present embodiment, the needle 60 has a needle body 61 provided with a movable core 70 and a needle body 61 whose outer diameter is smaller than the outer diameter of the needle body 61 and can come into contact with the valve member 40. It has a needle end portion 62 formed on the valve member 40 side of the above. Assuming that the outer diameter of the needle end 62 is D1 and the axial length of the needle end 62 is L1, the needle end 62 has a relationship of 1 / 7.4 ≦ D1 / L1 ≦ 1.06 / 7.4. It is formed to satisfy. Therefore, the rigidity of the needle end portion 62 is relatively low, and the time during which the needle 60, the valve member 40, and the stopper portion 50 collide with each other when the valve member 40 is opened can be lengthened. As a result, the maximum value of the collision force between the needle 60, the valve member 40, and the stopper portion 50 can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

(3) In the present embodiment, the needle end portion 62 is formed so that the outer diameter is 1 mm or more and 1.06 mm or less. Therefore, it is possible to further reduce the harsh high-frequency noise caused by the collision between the needle 60, the valve member 40, and the stopper portion 50.

Further, (4) in the present embodiment, the needle end portion 62 is formed so that the length in the axial direction is 7.4 mm. Therefore, it is possible to further reduce the harsh high-frequency noise caused by the collision between the needle 60, the valve member 40, and the stopper portion 50. Further, (12) the high-pressure pump 1 of the present embodiment includes the solenoid valve 10 and a plunger 11 that reciprocates in the axial direction and can pressurize the fuel in the pressurizing chamber 200. Therefore, when the solenoid valve 10 of the high-pressure pump 1 operates, it is possible to reduce high-frequency noise that is offensive to the ears.

(Second Embodiment)
A part of the high pressure pump according to the second embodiment is shown in FIG. In the second embodiment, the configuration of the needle 60 is different from that in the first embodiment.

In the present embodiment, the outer diameter of the needle end 62 is larger than the outer diameter of the needle end 62 of the first embodiment. As shown in FIG. 5, the needle 60 further has a needle recess 65. The needle recess 65 is formed so as to be radially inward from the outer wall of the needle end 62 in the entire circumferential range of the needle end 62. More specifically, the needle recess 65 is formed so that the contour is curved in the cross section of the surface including the axis of the needle end 62. More specifically, the needle recess 65 is formed so that the contour of the needle recess 62 is arcuate in the cross section of the surface including the axis of the needle end 62.

As described above, (5) in the present embodiment, the needle 60 is formed on the valve member 40 side of the needle body 61 so as to be able to come into contact with the needle body 61 and the valve member 40 provided with the movable core 70. It has a needle end 62 and a needle recess 65 formed so as to be radially inward from the outer wall of the needle end 62 in the entire circumferential range of the needle end 62. Therefore, the rigidity of the needle end portion 62 is relatively low in the needle recess 65, and the time during which the needle 60, the valve member 40, and the stopper portion 50 collide with each other when the valve member 40 is opened can be lengthened. As a result, the maximum value of the collision force between the needle 60, the valve member 40, and the stopper portion 50 can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

Further, (6) in the present embodiment, the needle recess 65 is formed so that the contour is curved in the cross section of the surface including the axis of the needle end portion 62. Therefore, damage to the needle 60 due to stress concentration at a specific location of the needle recess 65, such as when the needle 60 collides with the valve member 40 and the stopper portion 50, can be suppressed.

Further, (7) in the present embodiment, the needle recess 65 is formed so that the contour of the needle recess 65 is arcuate in the cross section of the surface including the axis of the needle end 62. Therefore, damage to the needle 60 due to stress concentration at a specific location of the needle recess 65, such as when the needle 60 collides with the valve member 40 and the stopper portion 50, can be suppressed more effectively.

(Third Embodiment)
A part of the high pressure pump according to the third embodiment is shown in FIG. The third embodiment is different from the first embodiment in the configuration of the needle 60, the stopper portion 50, the valve member 40, and the like.

In the present embodiment, the outer diameter of the needle end 62 is larger than the outer diameter of the needle end 62 of the first embodiment. As shown in FIG. 6, the inner diameter of the small diameter cylinder portion 512 of the stopper portion 50 is smaller than the inner diameter of the small diameter cylinder portion 512 of the first embodiment.

The stopper portion 50 has a stopper contact surface 55. The stopper contact surface 55 is formed on the inner edge of the annular stepped surface 513 between the large-diameter tubular portion 511 and the small-diameter tubular portion 512, and is the outer edge of the surface of the valve body 400 of the valve member 40 on the pressure chamber 200 side. The portion, more specifically, the outer edge portion, can be brought into contact with the inside of the tapered surface 402. When the valve member 40 comes into contact with the stopper contact surface 55, the movement in the valve opening direction is restricted. In this way, the stopper portion 50 can regulate the movement of the valve member 40 in the valve opening direction by abutting on the surface of the valve member 40 on the pressure chamber 200 side.

The end surface of the stopper convex portion 53 on the side opposite to the stopper bottom portion 52 is located on the pressure chamber 200 side with respect to the stepped surface 513 and cannot contact the valve member 40. Therefore, in the present embodiment, the stopper contact surface 54 is not formed on the stopper convex portion 53.

In the present embodiment, the valve member 40 is formed so that the plate thickness of the valve body 400 is 0.5 mm or more and 0.75 mm or less. Therefore, the rigidity of the valve member 40 is relatively low. Therefore, when the valve member 40 collides with the stopper contact surface 55 of the stopper portion 50 when the valve member 40 is opened, the valve member 40 is pushed in the valve opening direction by the needle end portion 62 at the center of the valve body 400. , Elastically deforms. As a result, the time during which the needle 60, the valve member 40, and the stopper portion 50 collide with each other can be lengthened. As a result, the maximum value of the collision force between the needle 60, the valve member 40, and the stopper portion 50 can be reduced as compared with the case of the conventional valve member 40 having a plate thickness of the valve body 400 larger than 0.75 mm. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

FIG. 7 shows the relationship between the plate thickness of the valve body 400 and the frequency of noise generated at the time of collision. From FIG. 7, it can be seen that the smaller the plate thickness of the valve body 400, the lower the noise frequency. In the present embodiment, based on the graph of FIG. 7, the valve member 40 has a configuration capable of achieving both the strength limit of the valve body 400 (plate thickness of 0.5 mm or more) and the target frequency of generated noise (20 kHz or less). The valve body 400 is formed so that the plate thickness is 0.5 mm or more and 0.75 mm or less.

As described above, (8) In the present embodiment, the stopper portion 50 has a stopper contact surface 55 capable of contacting the outer edge portion of the surface of the valve member 40 on the pressure chamber 200 side. The valve member 40 is formed so that the plate thickness is 0.5 mm or more and 0.75 mm or less. Therefore, the rigidity of the valve member 40 is relatively low, and the time during which the needle 60, the valve member 40, and the stopper portion 50 collide with each other when the valve member 40 is opened can be lengthened. As a result, the maximum value of the collision force between the needle 60, the valve member 40, and the stopper portion 50 can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

(Fourth Embodiment)
FIG. 8 shows a part of the high pressure pump according to the fourth embodiment. The fourth embodiment is different from the first embodiment in the configuration of the needle 60 and the stopper portion 50.

In the present embodiment, the outer diameter of the needle end 62 is larger than the outer diameter of the needle end 62 of the first embodiment. In the present embodiment, the stopper bottom portion 52 is formed so that the plate thickness is 0.5 mm or more and 0.74 mm or less. Therefore, the rigidity of the stopper bottom 52 is relatively low. Therefore, when the valve member 40 collides with the stopper contact surface 54 of the stopper portion 50 when the valve member 40 is opened, the stopper bottom portion 52 is elastically deformed by being pushed in the center by the stopper convex portion 53 in the valve opening direction. .. As a result, the time during which the needle 60, the valve member 40, and the stopper portion 50 collide with each other can be lengthened. As a result, the maximum value of the collision force between the needle 60, the valve member 40, and the stopper portion 50 can be reduced as compared with the case of the conventional stopper portion 50 in which the plate thickness of the stopper bottom portion 52 is larger than 0.74 mm. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

FIG. 9 shows the relationship between the plate thickness of the stopper bottom 52 and the frequency of noise generated at the time of collision. From FIG. 9, it can be seen that the smaller the plate thickness of the stopper bottom 52, the lower the noise frequency. In the present embodiment, based on the graph of FIG. 9, the stopper bottom 52 is provided as a configuration capable of achieving both the strength limit of the stopper bottom 52 (plate thickness of 0.5 mm or more) and the target frequency of generated noise (20 kHz or less). , The plate thickness is formed so as to be 0.5 mm or more and 0.74 mm or less.

As described above, (9) in the present embodiment, the stopper portion 50 is formed from the cylindrical stopper cylinder portion 51, the stopper bottom portion 52 that closes the end portion of the stopper cylinder portion 51 on the pressurizing chamber 200 side, and the stopper bottom portion 52. It has a stopper convex portion 53 projecting to the opposite side of the pressurizing chamber 200, and a stopper contact surface 54 formed on the stopper convex portion 53 and capable of contacting the surface of the valve member 40 on the pressurizing chamber 200 side. There is. The stopper bottom portion 52 is formed so that the plate thickness is 0.5 mm or more and 0.74 mm or less. Therefore, the rigidity of the stopper bottom portion 52 is relatively low, and the time during which the needle 60, the valve member 40, and the stopper portion 50 collide with each other when the valve member 40 is opened can be lengthened. As a result, the maximum value of the collision force between the needle 60, the valve member 40, and the stopper portion 50 can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

(Fifth Embodiment)
A part of the high pressure pump according to the fifth embodiment is shown in FIGS. 10 to 12. The fifth embodiment is different from the first embodiment in the configuration of the needle 60, the stopper portion 50, the valve member 40, and the like.

In the present embodiment, the outer diameter of the needle end 62 is larger than the outer diameter of the needle end 62 of the first embodiment.

As shown in FIGS. 10 and 11, in the present embodiment, the valve member 40 has a valve body 400 and an in-diameter urging portion 43. The valve body 400 has an outer valve portion 41 and an inner valve portion 42. The outer valve portion 41 is divided into three in the circumferential direction and arranged in a substantially annular shape (see FIG. 11B). The outer valve portion 41 is formed in a tapered shape so that the valve inner peripheral wall 410, which is an inner peripheral wall, approaches the axis of the valve main body 400 from the seat portion 30 side toward the pressurizing chamber 200 side.

The inner valve portion 42 is formed in a substantially disk shape, and is provided on the side opposite to the pressurizing chamber 200 with respect to the center of the outer valve portion 41 so that the needle end portion 62, which is one end of the needle 60, can come into contact with the inner valve portion 42. There is. The inner valve portion 42 is formed in a tapered shape so that the valve outer peripheral wall 420, which is the outer peripheral wall, approaches the axis of the valve main body 400 from the seat portion 30 side toward the pressurizing chamber 200 side. The valve outer peripheral wall 420 is slidable with the valve inner peripheral wall 410 of the outer valve portion 41.

Three in-diameter urging portions 43 are provided so as to urge each of the outer valve portions 41 divided into three in the circumferential direction in the in-diameter direction.

As shown in FIG. 10, in the present embodiment, the inner diameter of the small diameter cylinder portion 512 of the stopper portion 50 is smaller than the inner diameter of the small diameter cylinder portion 512 of the first embodiment. The stopper portion 50 has a stopper contact surface 56. The stopper contact surface 56 is formed on the inner edge portion of the annular stepped surface 513 between the large diameter tubular portion 511 and the small diameter tubular portion 512, and is formed on the surface of the outer valve portion 41 of the valve member 40 on the pressure chamber 200 side. Contact is possible. The stopper portion 50 can regulate the movement of the valve member 40 in the valve opening direction by the stopper contact surface 56 contacting the surface of the outer valve portion 41 of the valve member 40 on the pressure chamber 200 side.

The end surface of the stopper convex portion 53 opposite to the stopper bottom portion 52 is located on the pressure chamber 200 side with respect to the stepped surface 513 and cannot contact the valve member 40. Therefore, in the present embodiment, the stopper contact surface 54 is not formed on the stopper convex portion 53.

The inwardly urging portion 43 is provided so that one end is connected to the inner peripheral wall of the large diameter tubular portion 511 of the stopper portion 50 and the other end is connected to the outer edge portion of the outer valve portion 41, and the outer valve portion 41 is valved. It is urged inward in the diameter of the main body 400. Here, the outer valve portion 41 can move in the radial direction of the valve body 400 while the surface on the pressurizing chamber 200 side slides with the stopper contact surface 56.

When the valve member 40 is closed, the surface of the inner valve portion 42 on the seat portion 30 side comes into contact with the valve seat 300 (see FIG. 10). When the valve member 40 opens from the closed state, when the inner valve portion 42 moves in the valve opening direction, the valve outer peripheral wall 420 of the inner valve portion 42 slides with the valve inner peripheral wall 410 of the outer valve portion 41 while sliding. The three outer valve portions 41 move in the out-diameter direction against the urging force of the inwardly urging portion 43 (see FIGS. 10 and 12).

As described above, (10) In the present embodiment, the valve member 40 is divided into a plurality of parts in the circumferential direction and arranged in an annular shape, and the outer valve portion 41 in which the valve inner peripheral wall 410, which is the inner peripheral wall, is formed in a tapered shape. The valve outer peripheral wall 420, which is provided on the side opposite to the pressurizing chamber 200 with respect to the center of the outer valve portion 41 so that one end of the needle 60 can come into contact with the needle 60, slides with the valve inner peripheral wall 410 of the outer valve portion 41. It has an inner valve portion 42 formed in a tapered shape so as to be movable, and an inwardly urging portion 43 that urges the outer valve portion 41 in the inward direction, and the inner valve portion 42 moves in the valve opening direction. Then, while the valve outer peripheral wall 420 of the inner valve portion 42 slides with the valve inner peripheral wall 410 of the outer valve portion 41, the plurality of outer valve portions 41 move in the out-of-diameter direction. As a result, when the inner valve portion 42 is pushed by the needle 60 and moves in the valve opening direction when the valve member 40 is opened, the valve outer peripheral wall 420 of the inner valve portion 42 slides with the valve inner peripheral wall 410 of the outer valve portion 41. While moving, the plurality of outer valve portions 41 move in the out-of-diameter direction against the urging force of the inwardly urging portion 43. Therefore, the time during which the needle 60, the valve member 40, and the stopper portion 50 collide with each other can be lengthened. As a result, the maximum value of the collision force between the needle 60, the valve member 40, and the stopper portion 50 can be reduced. In addition, the collision force of high frequency can be reduced, and the noise of high frequency that is offensive to the ear can be reduced.

(11) In the present embodiment, the stopper portion 50 has a stopper contact surface 56 capable of contacting the surface of the outer valve portion 41 on the pressure chamber 200 side. The stopper portion 50 can regulate the movement of the valve member 40 in the valve opening direction by the stopper contact surface 56 contacting the surface of the outer valve portion 41 of the valve member 40 on the pressure chamber 200 side.

(Other embodiments)
In the first embodiment described above, an example is shown in which the needle end portion 62 is formed so as to satisfy the relationship of 1 / 7.4 ≦ D1 / L1 ≦ 1.06 / 7.4. On the other hand, in another embodiment, if the needle 60 is set to have an axial rigidity such that the resonance frequency is 20 kHz or less, the needle end 62 has 1 / 7.4 ≦ D1 / L1. It does not have to be formed so as to satisfy the relationship of ≦ 1.06 / 7.4. Further, in the above-mentioned first embodiment, an example is shown in which the needle end portion 62 is formed so that the outer diameter is 1 mm or more, 1.06 mm or less, and the axial length is 7.4 mm. On the other hand, in another embodiment, if the needle 60 is set to have an axial rigidity such that the resonance frequency is 20 kHz or less, the needle end portion 62 has an outer diameter of less than 1 mm or 1 It may be formed so as to have a length larger than .06 mm and a length in the axial direction other than 7.4 mm.

Further, in the above-mentioned second embodiment, an example is shown in which the needle recess 65 is formed so that the contour is curved in the cross section of the surface including the axis of the needle end portion 62. On the other hand, in another embodiment, the needle recess 65 may be formed so that the contour of the needle recess 62 is linear in the cross section of the surface including the axis of the needle end portion 62.

Further, in the above-mentioned fifth embodiment, an example is shown in which the outer valve portion 41 is divided into three in the circumferential direction. On the other hand, in another embodiment, the outer valve portion 41 may be divided into two or four or more in the circumferential direction. Further, in this case, the number of the inwardly urging portions 43 may be the same as the number of the outer valve portions 41 divided in the circumferential direction.

Further, in the above-described embodiment, the needle urging member 91 urges the needle 60 in the valve opening direction, the electromagnetic drive unit 80 sucks the movable core 70 in the valve closing direction, and the valve member 40, the needle 60, and the electromagnetic drive. An example is shown in which the portion 80 and the needle urging member 91 form a normally open type valve device. On the other hand, in another embodiment, the needle urging member 91 urges the needle 60 in the valve closing direction, the electromagnetic drive unit 80 sucks the movable core 70 in the valve opening direction, and the valve member 40, the needle 60, The electromagnetic drive unit 80 and the needle urging member 91 may form a normally closed type valve device.

Further, in another embodiment, the high pressure pump may be applied to an internal combustion engine other than a gasoline engine such as a diesel engine. Further, the high-pressure pump may be used as a fuel pump for discharging fuel toward a device other than the engine of the vehicle. Further, the solenoid valve may be applied to a device other than a high-pressure pump.

As described above, the present disclosure is not limited to the above embodiment, and can be implemented in various forms without departing from the gist thereof.

1 High-pressure pump, 10 solenoid valve, 20 housing (pressurization chamber forming part, suction passage forming part), 200 pressurizing chamber, 201 suction passage, 30 seat part, 301 inner passage (communication passage), 302 outer passage ( (Communication passage), 40 valve member, 50 stopper part, 60 needle, 70 movable core, 80 electromagnetic drive part, 91 needle urging member, 61 needle body, 62 needle end part, 65 needle recess, 51 stopper cylinder part, 52 stopper Bottom, 53 Stopper convex part, 54, 55 Stopper contact surface, 41 Outer valve part, 42 Inner valve part, 43 Diameter inward urging part

Claims (12)

A pressurizing chamber forming portion (20) forming a pressurizing chamber (200) to which a fluid is pressurized, and a pressurizing chamber forming portion (20).
A suction passage forming portion (20) forming a suction passage (201) through which a fluid sucked into the pressurizing chamber flows, and a suction passage forming portion (20).
A seat portion (30) provided in the suction passage and having a communication passage (301, 302) that communicates one surface with the other surface.
A valve member provided on the pressurizing chamber side of the seat portion and capable of allowing or regulating the flow of fluid in the communication passage by opening the valve away from the seat portion or contacting the seat portion and closing the valve. (40) and
A stopper portion (50) provided on the pressurizing chamber side with respect to the seat portion and capable of restricting the movement of the valve member in the valve opening direction by abutting on the surface of the valve member on the pressurizing chamber side.
A needle (60) provided so as to be reciprocating in the axial direction and having one end contacting a surface of the valve member opposite to the pressurizing chamber.
A movable core (70) provided on the needle and
An electromagnetic drive unit (80) capable of attracting the movable core together with the needle in the valve closing direction or the valve opening direction by energization.
A needle urging member (91) that urges the needle in the valve opening direction or the valve closing direction is provided.
The needle is a solenoid valve (10) whose axial rigidity is set so that the resonance frequency is 20 kHz or less. The needle is formed on the needle body (61) provided with the movable core and on the valve member side of the needle body so that the outer diameter is smaller than the outer diameter of the needle body and can abut on the valve member. Has a needle end (62)
Assuming that the outer diameter of the needle end is D1 and the axial length of the needle end is L1.
The solenoid valve according to claim 1, wherein the needle end is formed so as to satisfy the relationship of 1 / 7.4≤D1 / L1≤1.06 / 7.4. The solenoid valve according to claim 2, wherein the needle end is formed so that the outer diameter is 1 mm or more and 1.06 mm or less. The solenoid valve according to claim 2 or 3, wherein the needle end is formed so as to have an axial length of 7.4 mm. A pressurizing chamber forming portion (20) forming a pressurizing chamber (200) to which a fluid is pressurized, and a pressurizing chamber forming portion (20).
A suction passage forming portion (20) forming a suction passage (201) through which a fluid sucked into the pressurizing chamber flows, and a suction passage forming portion (20).
A seat portion (30) provided in the suction passage and having a communication passage (301, 302) that communicates one surface with the other surface.
A valve member provided on the pressurizing chamber side of the seat portion and capable of allowing or regulating the flow of fluid in the communication passage by opening the valve away from the seat portion or contacting the seat portion and closing the valve. (40) and
A stopper portion (50) provided on the pressurizing chamber side with respect to the seat portion and capable of restricting the movement of the valve member in the valve opening direction by abutting on the surface of the valve member on the pressurizing chamber side.
A needle (60) provided so as to be reciprocating in the axial direction and having one end contacting a surface of the valve member opposite to the pressurizing chamber.
A movable core (70) provided on the needle and
An electromagnetic drive unit (80) capable of attracting the movable core together with the needle in the valve closing direction or the valve opening direction by energization.
A needle urging member (91) that urges the needle in the valve opening direction or the valve closing direction is provided.
The needle includes a needle body (61) provided with the movable core, a needle end portion (62) formed on the valve member side of the needle body so as to be in contact with the valve member, and the needle end. A solenoid valve (10) having a needle recess (65) formed so as to be radially inwardly recessed from the outer wall of the needle end portion in the entire circumferential direction of the portion. The solenoid valve according to claim 5, wherein the needle recess is formed so that the contour of the needle recess is curved in a cross section formed by a surface including a shaft at the end of the needle. The solenoid valve according to claim 6, wherein the needle recess is formed so that the contour of the needle recess is arcuate in a cross section formed by a surface including the axis of the needle end. A pressurizing chamber forming portion (20) forming a pressurizing chamber (200) to which a fluid is pressurized, and a pressurizing chamber forming portion (20).
A suction passage forming portion (20) forming a suction passage (201) through which a fluid sucked into the pressurizing chamber flows, and a suction passage forming portion (20).
A seat portion (30) provided in the suction passage and having a communication passage (301, 302) that communicates one surface with the other surface.
A valve member provided on the pressurizing chamber side of the seat portion and capable of allowing or regulating the flow of fluid in the communication passage by opening the valve away from the seat portion or contacting the seat portion and closing the valve. (40) and
A stopper portion (50) provided on the pressurizing chamber side with respect to the seat portion and capable of restricting the movement of the valve member in the valve opening direction by abutting on the surface of the valve member on the pressurizing chamber side.
A needle (60) provided so as to be reciprocating in the axial direction and having one end contacting a surface of the valve member opposite to the pressurizing chamber.
A movable core (70) provided on the needle and
An electromagnetic drive unit (80) capable of attracting the movable core together with the needle in the valve closing direction or the valve opening direction by energization.
A needle urging member (91) that urges the needle in the valve opening direction or the valve closing direction is provided.
The stopper portion has a stopper contact surface (55) capable of contacting the outer edge portion of the surface of the valve member on the pressure chamber side.
The valve member is a solenoid valve (10) formed so that the plate thickness is 0.5 mm or more and 0.75 mm or less. A pressurizing chamber forming portion (20) forming a pressurizing chamber (200) to which a fluid is pressurized, and a pressurizing chamber forming portion (20).
A suction passage forming portion (20) forming a suction passage (201) through which a fluid sucked into the pressurizing chamber flows, and a suction passage forming portion (20).
A seat portion (30) provided in the suction passage and having a communication passage (301, 302) that communicates one surface with the other surface.
A valve member provided on the pressurizing chamber side of the seat portion and capable of allowing or regulating the flow of fluid in the communication passage by opening the valve away from the seat portion or contacting the seat portion and closing the valve. (40) and
A stopper portion (50) provided on the pressurizing chamber side with respect to the seat portion and capable of restricting the movement of the valve member in the valve opening direction by abutting on the surface of the valve member on the pressurizing chamber side.
A needle (60) provided so as to be reciprocating in the axial direction and having one end contacting a surface of the valve member opposite to the pressurizing chamber.
A movable core (70) provided on the needle and
An electromagnetic drive unit (80) capable of attracting the movable core together with the needle in the valve closing direction or the valve opening direction by energization.
A needle urging member (91) that urges the needle in the valve opening direction or the valve closing direction is provided.
The stopper portion has a cylindrical stopper cylinder portion (51), a stopper bottom portion (52) that closes the end portion of the stopper cylinder portion on the pressurizing chamber side, and a protrusion from the stopper bottom portion to a side opposite to the pressurizing chamber. It has a stopper convex portion (53) and a stopper contact surface (54) formed on the stopper convex portion and capable of contacting the surface of the valve member on the pressure chamber side.
The bottom of the stopper is a solenoid valve (10) formed so that the plate thickness is 0.5 mm or more and 0.74 mm or less. A pressurizing chamber forming portion (20) forming a pressurizing chamber (200) to which a fluid is pressurized, and a pressurizing chamber forming portion (20).
A suction passage forming portion (20) forming a suction passage (201) through which a fluid sucked into the pressurizing chamber flows, and a suction passage forming portion (20).
A seat portion (30) provided in the suction passage and having a communication passage (301, 302) that communicates one surface with the other surface.
A valve member provided on the pressurizing chamber side of the seat portion and capable of allowing or regulating the flow of fluid in the communication passage by opening the valve away from the seat portion or contacting the seat portion and closing the valve. (40) and
A stopper portion (50) provided on the pressurizing chamber side with respect to the seat portion and capable of restricting the movement of the valve member in the valve opening direction by abutting on the surface of the valve member on the pressurizing chamber side.
A needle (60) provided so as to be reciprocating in the axial direction and having one end contacting a surface of the valve member opposite to the pressurizing chamber.
A movable core (70) provided on the needle and
An electromagnetic drive unit (80) capable of attracting the movable core together with the needle in the valve closing direction or the valve opening direction by energization.
A needle urging member (91) that urges the needle in the valve opening direction or the valve closing direction is provided.
The valve member is divided into a plurality of parts in the circumferential direction and arranged in an annular shape, and the inner peripheral wall (410) is formed in a tapered shape. An inner valve portion (42) provided on the side opposite to the pressurizing chamber and tapered so that the outer peripheral wall (420) can slide with the inner peripheral wall of the outer valve portion, and the above. It has an inwardly urging portion (43) that urges the outer valve portion in the inward direction, and when the inner valve portion moves in the valve opening direction, the outer peripheral wall of the inner valve portion is inside the outer valve portion. A solenoid valve (10) in which a plurality of the outer valve portions move in the out-of-diameter direction while sliding with the peripheral wall. The solenoid valve according to claim 10, wherein the stopper portion has a stopper contact surface (56) capable of contacting the surface of the outer valve portion on the pressure chamber side. The solenoid valve according to any one of claims 1 to 11.
A plunger (11) capable of reciprocating in the axial direction and pressurizing the fluid in the pressurizing chamber,
High pressure pump (1).

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