JP5690187B2 - Coil assembly holding structure and ring-shaped elastic member - Google Patents

Description

  The present invention relates to a coil assembly holding structure and a ring-shaped elastic member, and more particularly to a coil assembly holding structure and a ring-shaped elastic member for appropriately holding a coil assembly which is a main component such as an electromagnetic valve.

  As a coil assembly which is a main component such as a solenoid valve, a cylindrical coil assembly in which a coil is wound around a coil bobbin is generally known. Since such a coil assembly is normally connected to a power supply line via an electrical joint, the electrical joint may be separated if the coil assembly is inadvertently rotated around the axis. Thus, various coil assembly holding structures that hold the coil assembly so as not to rotate unintentionally around the shaft have been proposed (see, for example, Patent Documents 1 to 3).

  Here, in Patent Document 1, in a structure in which a coil assembly is housed in a housing (20) fixed to a base body (60) that is a valve body, an O-ring (64) and the base body (60) and the housing (20 ), And a structure in which the coil assembly is prevented from rotating by another buffer member (36).

  Patent Document 2 discloses that a cover hood (28), which is a coil housing, is sealed by an outer seal body (38) formed on a seal element (36), and integrated with the outer seal body (38). A structure is described in which the coil assembly is prevented from rotating by the formed inner sealing body (46).

  Further, in Patent Document 3, the housing (11) is sealed by the seal portion (52) formed on the rubber seal (50), and the linear portion (51) formed integrally with the seal portion (52). A structure for locking the coil assembly is described.

JP 2008-99351 A Japanese National Patent Publication No. 11-511413 JP 2007-22223 A

  By the way, in the holding structure of the coil assembly described in Patent Document 1, an O-ring (64) for sealing between the base (60) and the housing (20), and a rotation preventing coil assembly. Another buffer member (36) is required, which disadvantageously increases the number of parts and assembly man-hours.

  On the other hand, in the coil assembly holding structure described in Patent Document 2, the outer seal body (38) that seals the cover hood (28), which is a housing, and the inner seal body (46) that prevents the coil assembly from rotating. ) Are integrally formed with different cross-sectional shapes on both the front and back surfaces, and the planar shape is also irregular. For this reason, when assembling the seal element (36), it is necessary to make sure that the orientation and front and back of the plan view are correct, and there is a problem that the assembling workability is poor.

  Similarly, in the coil assembly holding structure described in Patent Document 3, the seal portion (52) for sealing the housing (11) and the linear portion (51) for preventing the coil assembly from rotating are integrally formed. The made rubber seal (50) has different cross-sectional shapes on both the front and back surfaces, and the planar shape is also irregular. For this reason, when assembling the rubber seal (50), it is necessary to make sure that the orientation and front / back of the plan view are correct, and there is a problem that the assembling workability is poor.

  The present invention has been made in response to such problems of the prior art, and is provided for holding a coil assembly having functions of a seal of a coil housing that houses the coil assembly and a detent of the coil assembly. An object of the present invention is to provide a coil assembly holding structure that can improve the assembly workability. It is another object of the present invention to provide a ring-shaped elastic member for use in a coil assembly holding structure with improved assembly workability.

  In order to solve such a problem, a coil assembly holding structure according to the present invention is a structure for holding a cylindrical coil assembly to which a feed line is connected, and accommodates the coil assembly, A coil housing having one end in the axial direction of the assembly facing the opening of the housing space; a valve body having a seating surface facing a joint end surface on the opening side of the coil housing; the seating surface of the valve body; A ring-shaped elastic member sandwiched between the joint end surface of the coil housing, and the elastic member is formed on the outer peripheral side that seals between the seat surface of the valve body and the joint end surface of the coil housing. And a friction holding portion formed on the inner peripheral side that contacts the seating surface of the valve body and one end of the coil assembly to prevent the coil assembly from rotating about its axis. Characterized in that the both sides have a cross-sectional shape forming a symmetrical shape.

  In the coil assembly holding structure according to the present invention, the seal member that seals between the seat surface of the valve body and the joint end surface of the coil housing, and the friction holding portion that prevents the coil assembly from rotating about the axis are elastic members. The seal is formed integrally, and the seal between the valve body and the coil housing and the detent of the coil assembly can be realized by one component. In addition, since the elastic member has a cross-sectional shape in which both front and back surfaces are symmetrical, the elastic member can be assembled in either front or back direction, and assembling workability is improved.

In the coil assembly holding structure according to the present invention, when the thickness (b) of the friction holding portion of the elastic member is set to be thinner than the thickness (a) of the seal portion (b <a) , it is thicker than the friction holding portion. The seal portion can surely seal between the seat surface of the valve body and the joint end surface of the coil housing.

  Further, in the coil assembly holding structure according to the present invention, when the pair of front and back first protrusions protruding in the thickness direction from both the front and back surfaces of the elastic member are formed in the friction holding portion of the elastic member, the coil assembly The first protrusion on the side facing the coil assembly reliably prevents the coil assembly from rotating about the axis and securely holds the coil assembly in the axial direction without rattling.

  Further, when the second protrusion protruding in the radial direction from the inner periphery of the elastic member is formed in the friction holding portion of the elastic member, the pair of front and back first protrusions of the friction holding portion are connected to the seat surface of the valve body and the coil. When it falls between one end of the assembly and falls in the radial direction, the second protrusion comes into contact with the seat surface of the valve body or one end of the coil assembly, and the pair of front and back first protrusions fall. Suppress. As a result, one of the first protrusions on the side facing the coil assembly comes into reliable contact with one end of the coil assembly, and the coil assembly is more reliably prevented from rotating about the axis, and It is held more securely in the axial direction without rattling.

When one end portion of the coil assembly protrudes from the joint end surface on the opening side of the coil housing, and the protruding amount is set to be larger than the step between the seal portion on one side of the elastic member and the friction holding portion, the valve When the elastic member is sandwiched between the seat surface of the body, the joint end surface of the coil housing, and one end of the coil assembly, the one end of the coil assembly is frictionally held before the joint end surface abuts on the seal portion. The first protrusion on the coil assembly side falls to the inner diameter side, and the first protrusion on the valve body side falls to the outer diameter side. That is, since the direction in which the first protrusion falls can be determined as one direction, the direction in which the first protrusion falls is not affected by chance during assembly, and the first protrusion does not twist. , It is possible to suppress problems during assembly.

Then, the squeeze of the friction holding portion is greater than the squeeze of said seal portion is likely fall friction holding portion in the radial direction, but by having a second projection mentioned above, the friction holding portion Excessive falling can be suppressed, the frictional force between the friction holding portion and the one end portion of the coil assembly can be reliably generated, and the anti-rotation function can be sufficiently exhibited.

  In the coil assembly holding structure of the present invention, it is preferable that the housing recess for housing the elastic member is formed on the seating surface of the valve body because the workability of assembling the elastic member is improved. In this case, it is preferable that the bottom surface of the housing recess is a flat surface because it is easy to form the housing recess.

  Further, if a through hole is formed in the connection portion between the seal portion of the elastic member and the friction holding portion, the elastic force is generated between the seat surface of the valve body, the joint end surface of the coil housing, and one end portion of the coil assembly. When the member is clamped, the through hole serves as an air escape path, so that the seal portion and the friction holding portion of the elastic member are easily and reliably elastically deformed.

The ring-shaped elastic member for holding the coil assembly used in the present invention accommodates a valve body having a seating surface and a cylindrical coil assembly, and one end portion in the axial direction of the coil assembly is projecting from joining end face facing the bearing surface is a member which is interposed between the Koiruhaujin grayed to seal between said seat surface and said joining end face of the coil housing of the valve body, the outer peripheral side A seal portion formed, and a friction holding portion formed on the inner peripheral side that contacts the seating surface of the valve body and one end portion of the coil assembly to prevent the coil assembly from rotating about its axis. The front and back surfaces have a symmetrical cross-sectional shape, and the friction holding portion has a pair of front and back first protrusions that protrude from the front and back surfaces of the ring-shaped elastic member in the thickness direction, respectively. The pair of first The thickness (b) of the friction holding portion including the portion is smaller than the thickness (a) of the seal portion (b <a), and the seal portion on one side of the ring-shaped elastic member and the friction holding portion The step is set to be smaller than the protruding amount of the one end portion of the coil assembly from the joining end surface of the coil housing .

  In the coil assembly holding structure and the ring-shaped elastic member according to the present invention, a seal portion that seals between the seat surface of the valve body and the joint end surface of the coil housing, and a friction holding portion that prevents the coil assembly from rotating about its axis. Are formed integrally with the elastic member, and the seal between the valve body and the coil housing and the rotation prevention of the coil assembly can be realized by one component. In addition, since the elastic member has a cross-sectional shape in which both front and back surfaces are symmetrical, the elastic member can be assembled in either front or back direction, and assembling workability is improved.

It is sectional drawing of the solenoid valve which shows the coil assembly holding structure which concerns on one Embodiment of this invention. It is a perspective view of the elastic member shown in FIG. It is a top view of the elastic member shown in FIG. FIG. 4 is a cut end view taken along line IV-IV in FIG. 3. It is a fragmentary sectional view of the coil assembly holding structure after assembly. FIG. 3 is a partial cross-sectional view showing the progress of elastic deformation during assembly of the elastic member shown in FIG. 2, (a) is a partial cross-sectional view of the first stage, (b) is a partial cross-sectional view of the second stage, c) is a partial sectional view of the third stage, and (d) is a partial sectional view of the fourth stage. It is a fragmentary sectional view corresponding to (a)-(d) of Drawing 6 in a modification of an elastic member shown in Drawing 6.

  Next, an embodiment for carrying out a coil assembly holding structure according to the present invention will be described in detail with reference to the drawings. The coil assembly holding structure of one embodiment appropriately holds a coil assembly 2 that is a main component of the electromagnetic valve 1 having a cross-sectional structure as shown in FIG. 1 between the valve body 3 and the coil housing 4. And a ring-shaped elastic member (ring-shaped elastic member) 5 sandwiched between the seat surface 3A of the valve body 3 and the joint end surface 4A of the coil housing 4 is provided.

  The electromagnetic valve 1 is used, for example, for maintaining pressure in a vehicle brake system, and a mounting hole 3B for mounting a cylindrical fixed core 6 having a center hole 6A is formed in the valve body 3. In addition, a housing recess 3C for housing the ring-shaped elastic member 5 is formed as a part of the seat surface 3A around the opening of the mounting hole 3B.

  The cylindrical fixed core 6 forms a passage for brake hydraulic fluid between the mounting hole 3B of the valve body 3 and the mounting hole 3B with its tip projecting from the seating surface 3A of the valve body 3. It is press-fitted into.

  Here, a cylindrical valve seat member 7 is press-fitted into the center hole 6A of the fixed core 6, and a valve body 8 facing the valve seat member 7 is slidably fitted. A movable core 9 for driving the valve body 8 in the axial direction is disposed on the distal end side of the fixed core 6 so as to face the distal end face of the valve body 8. The movable core 9 is covered with a guide cap 10 attached to the tip of the fixed core 6 and is slidable along the inner periphery thereof.

  The coil assembly 2 includes a synthetic resin coil bobbin 11 having a center hole 11A fitted to the outer periphery of the guide cap 10, a coil 12 wound around the coil bobbin 11, and the outer periphery of the coil 12 and the coil bobbin 11 having a large diameter. The stepped cylindrical coil yoke 13 that is covered by the portion 13A and the small diameter portion 13B located on the base end side of the valve body 3 is fitted to the distal end portion of the fixed core 6, and the large diameter portion 13A of the coil yoke 13 And a donut plate-like end plate 14 fitted to the inner periphery of the distal end portion and the outer periphery of the distal end portion of the guide cap 10.

  Such a coil assembly 2 is housed in a housing space 4B that opens to the joint end surface 4A of the coil housing 4 in a state in which one end portion in the axial direction protrudes from the joint end surface 4A of the coil housing 4. That is, the annular wall portion 13C perpendicular to the axial direction formed between the small diameter portion 13B and the large diameter portion 13A on the base end side of the coil yoke 13 slightly protrudes from the joining end surface 4A and faces the outside. Thus, the coil assembly 2 is accommodated in the accommodating space 4 </ b> B of the coil housing 4.

  In the housing space 4B of the coil housing 4, a harness 16 that is a power supply line is connected to the coil 12 of the coil assembly 2 via a terminal 15 that is an electrical joint. The housing 4 is led out to the outside from the end opposite to the joining end surface 4A.

  Here, on the outer peripheral side of the ring-shaped elastic member 5, a seal portion 5A is formed which is sandwiched between the bottom surface of the housing recess 3C of the valve body 3 and the joining end surface 4A of the coil housing 4 to seal between the two. ing. Further, on the inner peripheral side of the elastic member 5, a friction holding portion that is sandwiched between the bottom surface of the housing recess 3C of the valve body 3 and the annular wall portion 13C of the coil yoke 13 of the coil assembly 2 and contacts both of them. 5B is formed.

  As shown in FIGS. 2 to 4, the friction holding portion 5 </ b> B on the inner peripheral side of the elastic member 5 has a pair of front and back first protrusions protruding in a ring shape (endless shape) from the front and back surfaces in the thickness direction. 5C and 5C are formed. The elastic member 5 is integrally formed with a second protrusion 5D that protrudes radially inward from the inner periphery of the friction holding part 5B. As shown in FIG. 4, the elastic member 5 has a cross-sectional shape in which both front and back surfaces are symmetrical.

  The seal portion 5A of the elastic member 5 is formed with a thickness of a. Further, the friction holding portion 5B of the elastic member 5 has a thickness including a pair of front and back first protrusions 5C and 5C, and a thickness of a second protrusion 5D protruding radially inward is set to c. . An annular portion between the seal portion 5A on the outer peripheral side of the elastic member 5 and the friction holding portion 5B on the inner peripheral side is a thin connection portion 5E having a thickness c, and this annular connection portion In 5E, for example, four through holes 5F are formed at equal intervals in the circumferential direction.

  Here, the crushing allowance of the friction holding part 5B is set larger than the crushing allowance of the seal part 5A. That is, as shown in FIGS. 4 and 5, the difference between the thickness b of the friction holding portion 5B before assembly and the gap f between the wall portion 13C, which is one end of the coil yoke 13 after assembly, and the bottom surface of the housing recess 3C. (B−f) is a difference (ad) between the thickness a of the seal portion 5A before assembly and the distance between the joint end surface 4A and the bottom surface of the housing recess 3C after assembly (that is, the depth of the housing recess 3C) d. ) Is set larger than. In such a case, the first protrusions 5C and 5C easily fall down in the radial direction after assembly, but the friction holding part 5B functions effectively by the second protrusion 5D as will be described later.

  Moreover, as shown in FIG. 5, the thickness of each part of the elastic member 5 is set to a> b> d> c. That is, (thickness of the seal portion 5A)> (thickness of the friction holding portion 5B including the first protrusions 5C and 5C)> (depth of the housing recess 3C)> (of the second protrusion 5D and the connection portion 5E) Thickness). The step {(ab) / 2} between the seal portion 5A on one side of the elastic member 5 and the first protrusion 5C on one side of the friction holding portion 5B is the wall portion of the coil yoke 13 shown in FIG. When the amount that 13C protrudes from the joining end face 4A of the coil housing 4 is e, it is set smaller than the protruding amount e. In other words, the protrusion amount e is set to be larger than the step {(ab) / 2}.

  Next, an assembling operation for appropriately holding the coil assembly 2 between the valve body 3 and the coil housing 4 of the electromagnetic valve 1 shown in FIG. 1 will be described. In this assembling operation, the fixed core 6 is fixed in advance in the mounting hole 3B of the valve body 3. That is, the fixed core 6 with the guide cap 10 covering the movable core 9 mounted at the tip is press-fitted into the mounting hole 3 </ b> B of the valve body 3. In addition, the coil assembly 2 is placed in the housing space 4B of the coil housing 4 in advance.

  After such preparation, first, as a first step, the elastic member 5 is placed and accommodated in the accommodating recess 3C of the valve body 3 as shown in FIG. In this case, since the elastic member 5 is formed in a cross-sectional shape in which both front and back surfaces are symmetrical, it can be accommodated in the accommodating recess 3C of the valve body 3 in either front or back direction, and its assembly workability is improved. good. Further, since the elastic member 5 is ring-shaped and has no directionality in the plan view of FIG. 3 (that is, the longitudinal section cut at any position in the circumferential direction has the same cross-sectional shape), this point is also assembled. Good workability.

  Next, as a second stage, as shown in FIG. 6B, the coil assembly 2 is brought close to the seat surface 3 </ b> A side of the valve body 3 together with the coil housing 4. At this time, the protruding amount e of the wall portion 13C of the coil yoke 13 that constitutes the coil assembly 2 protrudes from the joining end surface 4A of the coil housing 4 is kept in friction with one surface of the seal portion 5A of the elastic member 5 shown in FIG. Since it is set larger than the step {(ab) / 2} with respect to the first protrusion 5C on one side of the part 5B, before the joining end face 4A of the coil housing 4 comes into contact with the seal part 5A of the elastic member 5 Further, the wall portion 13C of the coil yoke 13 contacts the first protrusion 5C on one side of the friction holding portion 5B.

  When the wall 13 </ b> C of the coil yoke 13 contacts the first protrusion 5 </ b> C on one side of the elastic member 5, the elastic member 5 tilts so that the inner peripheral side approaches the bottom surface of the housing recess 3 </ b> C of the valve body 3. The pair of front and back first protrusions 5C and 5C formed on the inner peripheral friction holding part 5B is the inner side of the elastic member 5 with the first protrusion 5C on the front side pressed by the wall part 13C of the coil yoke 13. The first protrusion 5C on the back side is slightly tilted to the circumferential side, and is sandwiched between the wall portion 13C of the coil yoke 13 and the bottom surface of the housing recess 3C of the valve body 3 with the tilting slightly to the outer peripheral side of the elastic member 5. The

  Subsequently, as shown in FIG. 6C, as the third stage, when the coil assembly 2 is further moved closer to the seat surface 3A side of the valve body 3 together with the coil housing 4, the seal portion 5A of the elastic member 5 is moved. It is pressed against the joint end surface 4A of the coil housing 4 and elastically deforms. At that time, in the friction holding portion 5B of the elastic member 5, the first protrusion 5C on the front side increases the inclination toward the inner peripheral side, and the first protrusion 5C on the back side increases the inclination toward the outer peripheral side.

  As a fourth stage, as shown in FIG. 6D, the coil assembly 2 together with the coil housing 4 is further brought closer to the seating surface 3A side of the valve body 3, and the joint end surface 4A of the coil housing 4 is moved to the valve body. 3, the seal portion 5 </ b> A of the elastic member 5 is pressed against the joint end surface 4 </ b> A of the coil housing 4 and is sufficiently elastically deformed, and the joint end surface 4 </ b> A of the coil housing 4 and the housing recess of the valve body 3. Securely seal between the bottom of 3C.

  At that time, in the friction holding portion 5B of the elastic member 5, the back surface of the second protrusion 5D tilted to the bottom surface side of the housing recess 3C of the valve body 3 comes into contact with the bottom surface of the housing recess 3C. The outer peripheral surface of the first protrusion 5C on the front side inclined to the inner peripheral side is in close contact with the wall 13C of the coil yoke 13 and is in sufficient contact, and the first protrusion on the rear side inclined to the outer peripheral side of the elastic member 5 The inner peripheral surface of 5C is in close contact with the bottom surface of the housing recess 3C of the valve body 3 and is in sufficient contact.

  At this time, the air staying between the back surface of the connection portion 5E of the elastic member 5 and the bottom surface of the housing recess 3C of the valve body 3 passes through the plurality of through holes 5F formed in the connection portion 5E and is on the surface side of the connection portion 5E. Therefore, the elastic member 5 can sufficiently elastically deform into the cross-sectional shape shown in FIG. The coil assembly 2 is reliably prevented from rotating around the axis by the friction holding portion 5B of the elastic member 5 elastically deformed in this way, and is securely held in the axial direction without rattling.

  That is, according to the coil assembly holding structure of one embodiment, the elastic member 5 is attached to the coil assembly 2 for appropriately holding the coil assembly 2 between the valve body 3 and the coil housing 4 of the electromagnetic valve 1. By accommodating in the accommodating recess 3C of the valve body 3, the elastic member 5 can be reliably held at a predetermined position, and its assembling workability can be improved.

  Since the first protrusion 5C on the front side formed on the friction holding portion 5B of the elastic member 5 is securely in close contact with the wall portion 13C of the coil yoke 13 of the coil assembly 2, the coil assembly 2 is securely attached. It is possible to prevent the rotation around the shaft and to securely hold the shaft in the axial direction without rattling. As a result, it is possible to reliably prevent inadvertent separation of the terminal 15 as an electrical joint that connects the coil 12 of the coil assembly 2 and the harness 16 that is a power supply line within the accommodating space 4B of the coil housing 4. Can do.

  The thickness of each part of the elastic member 5 is (thickness of the seal portion 5A)> (thickness of the friction holding portion 5B including the first protrusions 5C and 5C)> (depth of the housing recess 3C)> (second Therefore, the space between the seat surface 3A of the valve body 3 and the joint end surface 4A of the coil housing 4 is reliably sealed by the seal portion 5A of the elastic member 5. be able to.

  The step {(ab) / 2} between the seal portion 5A on one side of the elastic member 5 and the first protrusion 5C on one side of the friction holding portion 5B is the amount of protrusion e of the wall portion 13C of the coil yoke 13 Therefore, as described with reference to FIG. 6, the direction in which the first protrusions 5C and 5C are tilted is set so that the coil yoke 13 side is on the inner peripheral side as shown in FIG. Since the valve body 3 side can be controlled so as to be on the outer peripheral side, the assembling direction of the first protrusions 5C, 5C is not affected by chance during assembly, and the assembly failure due to the twist of the first protrusions 5C, 5C, etc. Can be suppressed.

  The air staying between the back surface of the connecting portion 5E of the elastic member 5 and the bottom surface of the accommodating recess 3C of the valve body 3 is released to the surface side of the connecting portion 5E through a plurality of through holes 5F formed in the connecting portion 5E. Therefore, the seal part 5A and the friction holding part 5B of the elastic member 5 can be easily elastically deformed to exhibit the intended function.

  The coil assembly holding structure according to the present invention is not limited to the above-described embodiment. For example, in the elastic member 5 shown in FIGS. 2 to 3, the second protrusion 5 </ b> D protruding radially inward from the inner periphery of the friction holding part 5 </ b> B can be omitted. Even in this form, the elastic member 5 from which the second protrusion 5D is omitted is elastically deformed as shown in FIGS. 7A to 7D corresponding to FIGS. In the assembled state of the elastic member 5 shown in FIG. 7D, the seal portion 5A of the elastic member 5 reliably seals between the joint end surface 4A of the coil housing 4 and the bottom surface of the accommodating recess 3C of the valve body 3. To do.

  However, since the force with which the first protrusions 5C and 5C are pressed against the bottom surfaces of the coil yoke 13 and the housing recess 3C becomes unstable as compared with the case where there is the second protrusion 5D, the second protrusion 5D is provided. Is desirable.

  The pair of front and back first protrusions 5C and 5C of the elastic member 5 shown in FIGS. 2 to 3 are formed in a continuous annular shape. You may change into what protrudes intermittently in a direction.

DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Coil assembly 3 Valve body 3A Seat surface 3B Mounting hole 3C Housing recessed part 4 Coil housing 4A Joining end surface 4B Housing space 5 Elastic member 5A Seal part 5B Friction holding part 5C 1st protrusion 5D 2nd protrusion 5E Connection Part 5F Through hole 13 Coil yoke 13C Wall part 15 Terminal 16 Harness

Claims (6)

A structure for holding a cylindrical coil assembly to which a feed line is connected,
A coil housing that accommodates the coil assembly and has an axial end of the coil assembly face the opening of the accommodation space;
A valve body having a seating surface facing a joint end surface on the opening side of the coil housing;
A ring-shaped elastic member sandwiched between the seat surface of the valve body and the joint end surface of the coil housing;
The elastic member includes a seal portion formed on an outer peripheral side that seals between a seat surface of the valve body and a joint end surface of the coil housing, a seat surface of the valve body, and one end portion of the coil assembly. A friction holding portion formed on the inner circumferential side that prevents the coil assembly from rotating about its axis in contact with the inner surface , and has a cross-sectional shape in which both front and back surfaces are symmetrical .
The friction holding portion has a pair of front and back first protrusions that protrude in the thickness direction from both front and back surfaces of the elastic member,
A thickness (b) of the friction holding portion including the pair of first protrusions is thinner than a thickness (a) of the seal portion (b <a),
The one end of the coil assembly protrudes from the joint end surface on the opening side of the coil housing, and the protruding amount is set to be larger than the step between the seal portion and the friction holding portion on one side of the elastic member. A coil assembly holding structure characterized by comprising: The coil assembly holding structure according to claim 1 , wherein the elastic member is formed with a second protrusion that protrudes radially inward from an inner periphery of the friction holding part. Coil assembly retaining structure of claim 1 or claim 2 wherein the squeeze of the friction holding portion, and greater than squeeze of the seal portion. Wherein the seating surface of the valve body, the elastic member and accommodating recess which is formed accommodate, according to any one of claim 1 3, wherein the bottom surface of the housing recess is a flat surface Coil assembly holding structure. The coil assembly holding structure according to any one of claims 1 to 4 , wherein a through hole is formed in a connecting portion between the seal portion and the friction holding portion. A valve body having a seat surface, and accommodates a cylindrical coil assembly, one axial end of the coil assembly, held between the Koiruhaujin grayed projecting from joining end face facing the seating surface A ring-shaped elastic member,
Sealing between the seating surface of the valve body and the joint end surface of the coil housing, and a seal portion formed on the outer peripheral side; contacting the seating surface of the valve body and one end of the coil assembly And a friction holding portion formed on the inner peripheral side for preventing the coil assembly from rotating about its axis,
It has a cross-sectional shape in which both front and back sides are symmetrical ,
The friction holding portion has a pair of front and back first protrusions that protrude in the thickness direction from both front and back surfaces of the ring-shaped elastic member,
A thickness (b) of the friction holding portion including the pair of first protrusions is thinner than a thickness (a) of the seal portion (b <a),
The step between the seal portion and the friction holding portion on one side of the ring-shaped elastic member is set to be smaller than the protruding amount of the one end portion of the coil assembly from the joining end surface of the coil housing. A ring-shaped elastic member.

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