JP2011196435A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent biting-in of foreign matter in fluid to a clearance between a guide hole of a seat and a shaft part.SOLUTION: A shaft part release part 334 for communicating between a low pressure passage 311 and an armature chamber 37, is arranged on the outer peripheral surface of a shaft part 332 in a movable member 33. Thereby, when the fluid enters in and out between the armature chamber 37 and the low pressure passage 311, its fluid mainly passes through the shaft part release part 334, and is hard to infiltrates into a sliding part of the guide hole 313 and the shaft part 332, so that the biting-in of the foreign matter in the fluid to its sliding part, can be prevented.

Description

  The present invention relates to an electromagnetic valve that opens and closes a fluid passage, and is suitable for use in a pump that sucks and discharges fluid.

  The conventional solenoid valve is configured to open and close the fluid passage by driving the movable member by holding the movable member slidably on the seat and controlling energization to the solenoid. The movable member includes an armature that forms a magnetic circuit and a shaft portion that is slidably inserted into the guide hole of the sheet. An armature chamber in which an armature is disposed is defined between the solenoid and the seat, and the armature chamber and the fluid passage are separated by the seat. However, the armature chamber and the fluid passage are communicated by a through-hole formed in the sheet so that the fluid can easily enter and exit between the armature chamber and the fluid passage in accordance with the displacement of the movable member (for example, Patent Document 1).

Japanese Patent Laid-Open No. 2007-100590

  However, in the conventional solenoid valve, when the fluid enters and exits between the armature chamber and the fluid passage, the fluid enters and exits through the gap between the guide hole and the shaft portion, and foreign matter in the fluid enters the gap. There was a risk of biting.

  An object of the present invention is to prevent foreign matter in a fluid from being caught in a gap between a guide hole of a sheet and a shaft portion.

  In order to achieve the above object, according to the first aspect of the present invention, a solenoid (32) that generates a suction force when energized, and a movable member that opens and closes the fluid passage (311) by being displaced according to the energized state of the solenoid. (33) and a seat (31) for slidably holding the movable member, an armature chamber (37) is defined between the solenoid and the seat, and the movable member is positioned in the armature chamber. The armature (331) constituting the magnetic circuit and the columnar shaft portion fixed to the one end side and slidably inserted into the columnar guide holes (313, 313a, 313b) of the sheet (332, 332a, 332b) and a valve body portion that is formed on the side opposite to the armature in the shaft portion and opens and closes the fluid passage by contacting and separating from the seat surface (312) of the seat. 33) and provided with, on an outer peripheral surface of the shaft portion, wherein the shank relief portion that communicates between the fluid passage and the armature chamber (334,334a, 334b) is formed.

  According to this, when the fluid enters and exits between the armature chamber (37) and the fluid passage (311), the fluid mainly passes through the shaft portion relief portions (334, 334a, 334b) and passes through the guide holes (313, 313a). 313b) and the shaft portion (332, 332a, 332b) are less likely to enter the portion where the shaft portion (332, 332a, 332b) slides, so that foreign matter in the fluid is prevented from being caught in the portion where the guide hole and the shaft portion slide. Can do.

  Moreover, since the area of the site | part which a guide hole and an axial part slide becomes small, sliding resistance becomes small and a movable member (33) can be moved with force smaller than before.

  Furthermore, since the shaft portion relief portion is formed on the outer peripheral surface of the shaft portion, the processing is easy. Furthermore, it is possible to eliminate the through hole formed in the seat (31) in the conventional solenoid valve.

  As in the second aspect of the present invention, in the electromagnetic valve according to the first aspect, a plurality of shaft relief parts (334, 334a, 334b) can be formed.

  According to a third aspect of the present invention, in the electromagnetic valve according to the second aspect, the shaft relief portions (334, 334a, 334b) are equally spaced along the circumferential direction of the shaft portion (332, 332a, 332b). It is arranged.

  According to this, the pressure of the fluid of the shaft portion relief portions (334, 334a, 334b) is likely to act equally on the shaft portions (332, 332a, 332b), and the guide holes (313, 313a, 313b) and the shaft portion It is possible to make the surface pressure of the portion where the slide slides substantially uniform.

  As in the invention according to claim 4, in the solenoid valve according to any one of claims 1 to 3, the shaft relief (334, 334a, 334b) is a half-moon shape surrounded by an arc and a string. The cross-sectional shape can be made as follows. In addition, as in the fifth aspect of the invention, in the electromagnetic valve according to any one of the first to third aspects, the shaft portion relief portions (334, 334a, 334b) can be grooves.

  In the invention according to claim 6, the solenoid (32) that generates a suction force when energized, the movable member (33) that opens and closes the fluid passage (311) by being displaced according to the energized state of the solenoid, and the movable member In a solenoid valve having a seat (31) for slidably holding the armature, an armature chamber (37) is defined between the solenoid and the seat, and the movable member is positioned in the armature chamber to constitute a magnetic circuit. An armature (331) and a cylindrical shaft portion (332, 332a, 332b) that is fixed to one end side and is slidably inserted into the cylindrical guide holes (313, 313a, 313b) of the sheet And a valve body portion (333) that is formed on the shaft portion on the side opposite to the armature and that opens and closes the fluid passage in contact with and away from the seat surface (312) of the seat. In, wherein the guide hole relief portion for communicating between the fluid passage and the armature chamber (314) is formed.

  According to this, when the fluid enters and exits between the armature chamber (37) and the fluid passage (311), the fluid mainly passes through the guide hole escape portion (314) and the guide holes (313, 313a, 313b). Since it is difficult to enter the portion where the shaft portion slides, foreign matter in the fluid can be prevented from being caught in the portion where the guide hole and the shaft portion slide.

  Moreover, since the area of the site | part which a guide hole and an axial part slide becomes small, sliding resistance becomes small and a movable member (33) can be moved with force smaller than before. Furthermore, it is possible to eliminate the through hole formed in the seat (31) in the conventional solenoid valve.

  As in the seventh aspect of the invention, in the electromagnetic valve of the sixth aspect, a plurality of guide hole escape portions (314) can be formed.

  According to an eighth aspect of the present invention, in the electromagnetic valve according to the seventh aspect, the guide hole relief portions (314) are arranged at equal intervals along the circumferential direction of the guide holes (313, 313a, 313b). It is characterized by that.

  According to this, the pressure of the fluid in the guide hole relief portion (314) easily acts on the shaft portions (332, 332a, 332b), and the guide holes (313, 313a, 313b) and the shaft portion slide. The surface pressure of the part can be made substantially uniform.

  As in the ninth aspect of the invention, in the electromagnetic valve according to any one of the first to eighth aspects, the armature (331), the shaft portion (332, 332a, 332b), and the valve body portion (333). Can be integrated.

  According to a tenth aspect of the present invention, in the electromagnetic valve according to any one of the first to eighth aspects, the shaft portion (332, 332a, 332b) is a first shaft portion integrated with the armature (331). (332, 332a, 332b) and a second shaft portion (332, 332a, 332b) on which the valve body portion (333) is formed. The valve body portion and the second shaft portion are armature and the first shaft portion. When the armature and the first shaft portion are urged by the spring (39) and the solenoid and the first shaft portion are attracted by the solenoid, the valve body portion and the second shaft portion move so as to follow the armature and the first shaft portion. It is configured.

  According to this, it is the armature (331) and the first shaft portions (332, 332a, 332b) that are attracted to the solenoid (32), and since the things attracted by the solenoid become lighter, the suction force of the solenoid is reduced. And thus the solenoid can be miniaturized.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is sectional drawing which shows the pump using the solenoid valve which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the solenoid valve single-piece | unit of FIG. It is sectional drawing which follows the AA line of FIG. It is sectional drawing of the principal part which shows the 1st modification of 1st Embodiment. It is sectional drawing of the principal part which shows the 2nd modification of 1st Embodiment. It is sectional drawing of the principal part which shows the 3rd modification of 1st Embodiment. It is sectional drawing which shows the solenoid valve which concerns on 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described. 1 is a cross-sectional view showing a pump using a solenoid valve according to the present embodiment, FIG. 2 is a cross-sectional view showing a single solenoid valve of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG.

  The pump according to the present embodiment is used as a fuel supply pump for supplying high-pressure fuel to a common rail that stores high-pressure fuel in a fuel injection device for injecting fuel into a compression ignition type internal combustion engine.

  1 and 2, the pump housing 10 includes a cam chamber 101 located on the lower end side thereof, a columnar slider insertion hole 102 extending from the cam chamber 101 toward the upper side of the pump housing 10, A cylindrical cylinder insertion hole 103 extending from the slider insertion hole 102 to the upper end surface of the pump housing 10 is formed.

  A cam shaft 11 driven by a compression ignition internal combustion engine (hereinafter referred to as an internal combustion engine) (not shown) is disposed in the cam chamber 101, and the cam shaft 11 is rotatably supported by the pump housing 10. A cam 12 is formed on the cam shaft 11.

  A cylinder 13 is attached to the cylinder insertion hole 103 so as to close the cylinder insertion hole 103. A cylindrical plunger insertion hole 131 is formed in the cylinder 13, and the cylindrical plunger 14 is inserted into the plunger insertion hole 131 so as to be able to reciprocate. A plunger chamber 15 is formed by the upper end surface of the plunger 14 and the inner peripheral surface of the cylinder 13.

  A sheet 141 is connected to the lower end of the plunger 14, and the sheet 141 is pressed against the slider 17 by a spring 16. The slider 17 is formed in a cylindrical shape, and is inserted into the slider insertion hole 102 so as to freely reciprocate.

  A cam roller 18 is rotatably attached to the slider 17, and the cam roller 18 is in contact with the cam 12. When the cam 12 is rotated by the rotation of the cam shaft 11, the plunger 14 is reciprocated together with the sheet 141, the slider 17 and the cam roller 18.

  A fuel reservoir 19 is formed between the cylinder 13 and the pump housing 10. Low pressure fuel discharged from a low pressure supply pump (not shown) is supplied to the fuel reservoir 19 via a low pressure fuel pipe (not shown). The fuel reservoir 19 includes a low-pressure communication path 132 formed in the cylinder 13, a suction chamber 21 formed between the cylinder 13 and a seat 31 of an electromagnetic valve 30 described later, and a low-pressure passage in the electromagnetic valve 30 described later. It communicates with the plunger chamber 15 via 311.

  The cylinder 13 is formed with a high-pressure communication path 133 that always communicates with the plunger chamber 15. The plunger chamber 15 is connected to a common rail (not shown) via the high pressure communication path 133, the discharge valve 20, and a high pressure fuel pipe (not shown).

  The discharge valve 20 is attached to the cylinder 13 on the downstream side of the high-pressure communication path 133. The discharge valve 20 includes a valve body 201 that opens and closes a high-pressure fuel supply path, and a spring 202 that biases the valve body 201 in the valve closing direction. The fuel pressurized in the plunger chamber 15 moves the valve body 201 in the valve opening direction against the urging force of the spring 202 and is pumped to the common rail.

  The electromagnetic valve 30 is screwed and fixed to the cylinder 13 so as to close the plunger chamber 15 at a position facing the upper end surface of the plunger 14.

  The electromagnetic valve 30 includes a seat 31, which is disposed in the low pressure passage 311 as a fluid passage having one end communicating with the plunger chamber 15 and the other end communicating with the suction chamber 21. The sheet surface 312 is formed.

  The solenoid valve 30 includes a solenoid 32 that generates a suction force when energized, a movable member 33 that opens and closes the low-pressure passage 311 by being displaced according to the energized state of the solenoid 32, and biases the movable member 33 toward the non-suction side. In other words, the first spring 34 that biases the movable member 33 in the valve opening direction and the stopper 35 that restricts the position of the movable member 33 when the valve is opened are provided. The stopper 35 is sandwiched between the electromagnetic valve 30 and the cylinder 13, and a plurality of communication holes 351 are provided for communicating the low pressure passage 311 and the plunger chamber 15.

  A cylindrical spacer 36 is disposed between the seat 31 and the solenoid 32, and an armature chamber 37 is defined between the seat 31 and the solenoid 32, and the armature chamber 37 is separated from the low pressure passage 311 and the suction chamber by the seat 31. 21 is separated.

  The movable member 33 is positioned in the armature chamber 37 and has a disk-shaped armature 331 constituting a magnetic circuit, and a columnar shaft portion 332 slidably inserted into a columnar guide hole 313 formed in the sheet 31. And a valve body portion 333 formed on the shaft portion 332 on the side opposite to the armature. The valve body portion 333 opens and closes the low-pressure passage 311 in contact with and away from the seat surface 312. The shaft portion 332 and the valve body portion 333 are integrated, and the integrated portion of the shaft portion 332 and the valve body portion 333 and the armature 331 are integrated by caulking or the like.

  As shown in FIGS. 2 and 3, a shaft portion relief portion 334 that always communicates between the low pressure passage 311 and the armature chamber 37 is formed on the outer peripheral surface of the shaft portion 332. The shaft relief portion 334 has a half-moon shaped cross section surrounded by an arc and a string.

  Further, the three shaft portion relief portions 334 are arranged at equal intervals along the circumferential direction of the shaft portion 332, whereby the fluid pressure of the shaft portion relief portion 334 is easily applied to the shaft portion 332. Thus, the surface pressure of the portion where the guide hole 313 and the shaft portion 332 slide can be made substantially uniform.

  In this example, three shaft portion relief portions 334 are formed, but one shaft portion relief portion 334 may be formed, or two, or four or more portions may be formed.

  The operation in the above configuration will be described. First, when the solenoid 32 of the electromagnetic valve 30 is not energized, the movable member 33 is moved to the valve opening position by the urging force of the first spring 34. That is, the valve body portion 333 is separated from the seat surface 312 and the low pressure passage 311 is opened.

  When the plunger 14 is lowered while the low pressure passage 311 is open, the low pressure fuel discharged from the low pressure supply pump passes through the fuel reservoir 19, the low pressure communication passage 132, the suction chamber 21, and the low pressure passage 311. And supplied to the plunger chamber 15.

  Next, when the plunger 14 starts to rise, the plunger 14 tries to pressurize the fuel in the plunger chamber 15. However, since the solenoid valve 30 is not energized and the low pressure passage 311 is opened at the beginning of the plunger 14 ascending, the fuel in the plunger chamber 15 passes through the low pressure passage 311, the suction chamber 21, and the low pressure communication passage. It overflows to the fuel reservoir 19 side through 132 and is not pressurized.

  When the solenoid valve 30 is energized during the overflow of fuel in the plunger chamber 15, the movable member 33 is attracted against the urging force of the first spring 34, and the valve body 333 is seated on the seat surface 312. Thus, the low pressure passage 311 is closed. Thereby, the overflow of the fuel to the fuel reservoir 19 side is stopped, and pressurization of the fuel in the plunger chamber 15 by the plunger 14 is started. The discharge valve 20 is opened by the fuel pressure in the plunger chamber 15, and the fuel is pumped to the common rail.

  In the present embodiment, as the movable member 33 is displaced, the fuel enters and exits between the armature chamber 37 and the low pressure passage 311 through the gap between the guide hole 313 and the shaft portion 332. Mainly passes through the shaft escape portion 334 and is difficult to enter the portion where the guide hole 313 and the shaft portion 332 slide, so that foreign matter in the fuel is introduced to the portion where the guide hole 313 and the shaft portion 332 slide. Biting can be prevented.

  Moreover, since the area of the site | part which the guide hole 313 and the axial part 332 slide becomes small, sliding resistance becomes small and the movable member 33 can be moved with force smaller than before. Therefore, the suction force of the solenoid 32 can be reduced, and the solenoid 32 can be reduced in size.

  Further, since the shaft portion relief portion 334 is formed on the outer peripheral surface of the shaft portion 332, the processing is easy. Furthermore, the through-hole formed in the seat in the conventional solenoid valve can be eliminated.

  In the present embodiment, the shaft portion relief portion 334 has a half-moon-like cross-sectional shape obtained by planarly cutting the outer peripheral surface of the shaft portion 332. However, the first modified example shown in FIG. 4 and the second modified example shown in FIG. As described above, the shaft portion relief portion 334 may be a groove.

  Specifically, in the first modification shown in FIG. 4, the shaft portion 332 has a cross-sectional shape in the shape of a cross, and the shaft portion relief portion 334 has a fan-like shape (more specifically, a quarter circle shape). ing. In the second modified example shown in FIG. 5, the shaft portion relief portion 334 has a substantially rectangular cross-sectional shape. Further, in the first modified example and the second modified example, four shaft portion relief portions 334 are arranged at equal intervals along the circumferential direction of the shaft portion 332.

  And like the 1st modification and the 2nd modification, when shaft part relief part 334 is made into a groove, part where guide hole 313 and shaft part 332 slide rather than the case where shaft part 332 is cut in plane It is possible to increase the passage area of the shaft portion relief portion 334 while securing the area.

  In addition, in the 1st modification and the 2nd modification, although the four shaft part relief parts 334 were formed, you may form 1-3 or five or more shaft part relief parts 334.

  In the above embodiment, the escape portion 334 is formed in the shaft portion 332. However, as in the third modified example shown in FIG. 6, the guide hole 313 of the seat 31 is provided between the low pressure passage 311 and the armature chamber 37. You may form the guide hole escape part 314 always communicated.

  Specifically, in the third modification shown in FIG. 6, the guide hole escape portion 314 has a substantially rectangular cross-sectional shape. In addition, four guide hole relief portions 314 are arranged at equal intervals along the circumferential direction of the guide hole 313. In the third modification, 1 to 3 guide holes or 5 or more guide hole relief portions 314 may be formed.

(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 7 is a cross-sectional view showing the electromagnetic valve according to the present embodiment. In the present embodiment, the seat 31 and the movable member 33 are divided, and the other parts are the same as those in the first embodiment, and therefore only different parts will be described.

  As shown in FIG. 7, the shaft portion 332 is divided into a first shaft portion 332 a integrated with the armature 331 and a second shaft portion 332 b in which the valve body portion 333 is formed. Further, the sheet 31 holds the first shaft portion 332a slidably in the first guide hole 313a and the second shaft portion 332b slidably in the second guide hole 313b. It is divided into second sheets 31b.

  An intermediate chamber 38 communicating with the first guide hole 313a and the second guide hole 313b is formed between the first sheet 31a and the second sheet 31b.

  On the outer peripheral surface of the first shaft portion 332a, a first shaft portion relief portion 334a that always communicates between the intermediate chamber 38 and the armature chamber 37 is formed. On the outer peripheral surface of the second shaft portion 332b, a second shaft portion relief portion 334b that always communicates between the intermediate chamber 38 and the low pressure passage 311 is formed.

  The counter valve body side of the second shaft portion 332 b protrudes into the intermediate chamber 38. The intermediate chamber 38 is provided with a second spring 39 that biases the second shaft portion 332b toward the first shaft portion 332a (in other words, biases the second shaft portion 332b toward the valve closing direction). .

  In the above configuration, when the solenoid 32 of the solenoid valve 30 is not energized, the armature 331 and the first shaft portion 332a are urged by the first spring 34 and move toward the second shaft portion 332b, and the first shaft The portion 332a contacts the second shaft portion 332b. Further, the armature 331, the first shaft portion 332a, and the second shaft portion 332b are moved to the valve opening position against the biasing force of the second spring 39 by the biasing force of the first spring 34. That is, the valve body portion 333 is separated from the seat surface 312 and the low pressure passage 311 is opened.

  On the other hand, when the solenoid valve 30 is energized and the armature 331 and the first shaft portion 332a are attracted against the biasing force of the first spring 34, the second shaft portion 332b biased by the second spring 39 is It moves following the armature 331 and the first shaft portion 332a, the valve body portion 333 is seated on the seat surface 312 and the low pressure passage 311 is closed.

  In the present embodiment, with the displacement of the movable member 33, the armature chamber 37 and the low-pressure passage 311 are interposed via the first shaft portion relief portion 334a, the second shaft portion relief portion 334b, and the intermediate chamber 38. The fuel comes in and out. Accordingly, it is possible to prevent foreign matters in the fuel from getting caught in the portion where the first guide hole 313a and the first shaft portion 332a slide or the portion where the second guide hole 313b and the second shaft portion 332b slide. can do.

  In addition, the armature 331 and the first shaft portion 332a of the movable member 33 are attracted by the solenoid 32. Since the material attracted by the solenoid 32 becomes lighter, the suction force of the solenoid 32 can be reduced. As a result, the solenoid 32 can be reduced in size.

  In the present embodiment, the escape portions 334a and 334b are formed in the first shaft portion 332a and the second shaft portion 332b, respectively, but the escape portions are formed in the first guide hole 313a and the second guide hole 313b of the seat 31, respectively. May be.

(Other embodiments)
In each of the above embodiments, the electromagnetic valve of the present invention is applied to a fuel supply pump of a fuel injection device for an internal combustion engine. However, the present invention can be widely applied to an electromagnetic valve that opens and closes a fluid passage. Moreover, each said embodiment can be arbitrarily combined in the range which can be implemented.

31 Seat 32 Solenoid 33 Movable member 37 Armature chamber 311 Fluid passage (low pressure passage)
312 Seat surface 313 Guide hole 331 Armature 332 Shaft portion 333 Valve body portion 334 Shaft portion relief portion 313a Guide hole 313b Guide hole 332a Shaft portion 332b Shaft portion 334a Shaft portion relief portion 334b Shaft portion relief portion

Claims (10)

A solenoid (32) that generates a suction force when energized;
A movable member (33) that opens and closes the fluid passage (311) by being displaced according to the energization state of the solenoid;
In a solenoid valve comprising a sheet (31) that slidably holds the movable member,
An armature chamber (37) is defined between the solenoid and the seat (31),
The movable member is positioned in the armature chamber to constitute an armature (331) that constitutes a magnetic circuit, and the armature is fixed to one end side, and the cylindrical guide holes (313, 313a, 313b) of the sheet. Cylindrical shaft portions (332, 332a, 332b) that are slidably inserted, and formed on the anti-armature side of the shaft portions, and are in contact with and separated from the seat surface (312) of the sheet, thereby allowing the fluid passage to pass through. A valve body portion (333) for opening and closing;
A solenoid valve characterized in that shaft part relief parts (334, 334a, 334b) for communicating between the fluid passage and the armature chamber are formed on the outer peripheral surface of the shaft part.   The solenoid valve according to claim 1, wherein a plurality of the shaft portion relief portions (334, 334 a, 334 b) are formed.   The solenoid valve according to claim 2, wherein the shaft portion relief portions (334, 334a, 334b) are arranged at equal intervals along a circumferential direction of the shaft portion (332, 332a, 332b). .   The solenoid valve according to any one of claims 1 to 3, wherein the shaft portion relief portion (334, 334a, 334b) has a half-moon-like cross-sectional shape surrounded by an arc and a string.   The electromagnetic valve according to any one of claims 1 to 3, wherein the shaft portion relief portion (334, 334a, 334b) is a groove. A solenoid (32) that generates a suction force when energized;
A movable member (33) that opens and closes the fluid passage (311) by being displaced according to the energization state of the solenoid;
In a solenoid valve comprising a sheet (31) that slidably holds the movable member,
An armature chamber (37) is defined between the solenoid and the seat;
The movable member is positioned in the armature chamber to constitute an armature (331) that constitutes a magnetic circuit, and the armature is fixed to one end side, and the cylindrical guide holes (313, 313a, 313b) of the sheet. Cylindrical shaft portions (332, 332a, 332b) that are slidably inserted, and formed on the anti-armature side of the shaft portions, and are in contact with and separated from the seat surface (312) of the sheet, thereby allowing the fluid passage to pass through. A valve body portion (333) for opening and closing;
The electromagnetic valve according to claim 1, wherein a guide hole relief portion (314) for communicating between the fluid passage and the armature chamber is formed in the guide hole.   The solenoid valve according to claim 6, wherein a plurality of the guide hole relief portions (314) are formed.   The electromagnetic valve according to claim 7, wherein the guide hole relief portions (314) are arranged at equal intervals along a circumferential direction of the guide holes (313, 313a, 313b).   The electromagnetic according to any one of claims 1 to 8, wherein the armature (331), the shaft portion (332, 332a, 332b), and the valve body portion (333) are integrated. valve. The shaft portion (332, 332a, 332b) includes a first shaft portion (332, 332a, 332b) integrated with the armature (331) and a second shaft portion formed with the valve body portion (333). (332, 332a, 332b),
The valve body part and the second shaft part are urged by a spring (39) toward the armature and the first shaft part, and when the armature and the first shaft part are attracted by the solenoid, The solenoid valve according to any one of claims 1 to 8, wherein the valve body portion and the second shaft portion are configured to move following the armature and the first shaft portion. .

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