ELECTROMAGNETIC VALVE UNIT

Abstract

An electromagnetic valve unit held so as to be sandwiched between a receiving portion of a housing portion of control equipment and a pressing member includes a shoulder portion to be opposed to the receiving portion of the housing portion and an annular elastic member provided with a protruded portion to be inserted into a recessed portion formed at the shoulder portion. The annular elastic member is further provided with an annular deformation portion that is deformable in the axial direction so as not to press the protruded portion in the axial direction.

Claims

1. An electromagnetic valve unit configured to be held sandwiched between a receiving portion of a housing portion of control equipment and a pressing member in an axial direction of the electromagnetic valve unit, comprising: a shoulder portion configured to be opposed to the receiving portion of the housing portion; and an annular elastic member provided with a protruded portion configured to be inserted into a recessed portion formed at the shoulder portion, wherein the annular elastic member is further provided with an annular deformation portion that is deformable in the axial direction of the electromagnet valve unit so as not to press the protruded portion in the axial direction, and the recessed portion and the protruded portion are partially formed in the circumferential direction.

2. The electromagnetic valve unit according to claim 1, wherein the recessed portion is formed in the shoulder portion and is configured so as to be recessed in a radially inward direction with a wall portion remaining in the axial direction, and the protruded portion is protruded in the radially inward direction.

3. The electromagnetic valve unit according to claim 1, wherein the protruded portion is press-fitted in the recessed portion.

4. The electromagnetic valve unit according to claim 1, wherein the deformation portion is arranged along an outer peripheral surface of the shoulder portion.

5. The electromagnetic valve unit according to claim 1, wherein an outer diameter of the deformation portion is smaller than an inner diameter of the housing portion.

6. The electromagnetic valve unit according to claim 1, comprising a plurality of the recessed portions and a plurality of the protruded portions equiangularly arranged in the circumferential direction.

7. The electromagnetic valve unit according to claim 2, wherein the protruded portion is press-fitted in the recessed portion.

8. The electromagnetic valve unit according to claim 2, wherein the deformation portion is arranged along an outer peripheral surface of the shoulder portion.

9. The electromagnetic valve unit according to claim 2, wherein an outer diameter of the deformation portion is smaller than an inner diameter of the housing portion.

10. The electromagnetic valve unit according to claim 2, comprising a plurality of the recessed portions and a plurality of the protruded portions equiangularly arranged in the circumferential direction.

11. An electromagnetic valve unit configured to be held sandwiched between a receiving portion of a housing portion of control equipment and a pressing member in an axial direction of the electromagnetic valve unit, comprising: a shoulder portion configured to be opposed to the receiving portion of the housing portion; and an annular elastic member provided with a protruded portion configured to be inserted into a recessed portion formed at the shoulder portion, wherein the annular elastic member is further provided with an annular deformation portion that is deformable in the axial direction of the electromagnet valve unit so as not to press the protruded portion in the axial direction, the recessed portion is formed to be recessed in the axial direction, and the protruded portion is formed to be protruded in the axial direction.

12. The electromagnetic valve unit according to claim 11, wherein the protruded portion is press-fitted in the recessed portion.

13. The electromagnetic valve unit according to claim 11, wherein the recessed portion and the protruded portion are formed in an annular shape.

14. The electromagnetic valve unit according to claim 11, wherein the elastic member includes an annular portion from which the protruded portion is protruded in the axial direction, the annular portion is constituted by an outer-diameter-side portion not overlapping with the protruded portion in the axial direction, an inner-diameter-side portion not overlapping with the protruded portion in the axial direction, and an intermediate portion provided between the outer-diameter-side portion and the inner-diameter-side portion and overlapping with the protruded portion in the axial direction, and the deformation portion is formed by the outer-diameter-side portion and the inner-diameter-side portion.

15. The electromagnetic valve unit according to claim 11, wherein the shoulder portion has a stepped shape formed by an end surface extending from an outer peripheral surface of the electromagnetic valve unit in a direction perpendicular to the axial direction and an outer peripheral surface extending from a radially inward edge of the end surface in the axial direction, and the recessed portion is formed in the end surface of the shoulder portion.

16. The electromagnetic valve unit according to claim 12, wherein the recessed portion and the protruded portion are formed in an annular shape.

17. The electromagnetic valve unit according to claim 12, wherein the elastic member includes an annular portion from which the protruded portion is protruded in the axial direction, the annular portion is constituted by an outer-diameter-side portion not overlapping with the protruded portion in the axial direction, an inner-diameter-side portion not overlapping with the protruded portion in the axial direction, and an intermediate portion provided between the outer-diameter-side portion and the inner-diameter-side portion and overlapping with the protruded portion in the axial direction, and the deformation portion is formed by the outer-diameter-side portion and the inner-diameter-side portion.

18. The electromagnetic valve unit according to claim 12, wherein the shoulder portion has a stepped shape formed by an end surface extending from an outer peripheral surface of the electromagnetic valve unit in a direction perpendicular to the axial direction and an outer peripheral surface extending from a radially inward edge of the end surface in the axial direction, and the recessed portion is formed in the end surface of the shoulder portion.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a schematic sectional view illustrating a buffer device including an electromagnetic valve unit according to a first embodiment of the present invention.

[0017] FIG. 2 is a front sectional view illustrating the electromagnetic valve unit in the first embodiment.

[0018] FIG. 3 is a perspective view illustrating an elastic member in the first embodiment.

[0019] FIG. 4 is a front sectional view illustrating a state in which the elastic member in the first embodiment is attached to a shoulder portion of the electromagnetic valve unit.

[0020] FIG. 5 is a front sectional view illustrating a state in which the electromagnetic valve unit in the first embodiment is attached to a housing.

[0021] FIG. 6 is a perspective view illustrating an elastic member of an electromagnetic valve unit according to a second embodiment of the present invention.

[0022] FIG. 7 is a front sectional view illustrating a state in which the elastic member in the second embodiment is attached to a shoulder portion of an electromagnetic valve unit.

[0023] FIG. 8 is an A-A sectional view of FIG. 7.

[0024] FIG. 9 is a perspective view illustrating an elastic member of an electromagnetic valve unit according to a third embodiment of the present invention.

[0025] FIG. 10 is a front sectional view illustrating a state in which the elastic member in the third embodiment is attached to a shoulder portion of an electromagnetic valve unit.

[0026] FIG. 11 is a front sectional view illustrating a state in which an elastic member in a typical example is attached to a shoulder portion of a conventional electromagnetic valve unit.

DESCRIPTION OF EMBODIMENTS

[0027] Hereinafter, modes for carrying out an electromagnetic valve unit according to the present invention will be described based on embodiments.

First Embodiment

[0028] An electromagnetic valve unit according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. Hereinafter, a near side in the plane of paper of FIG. 1 will be described as a front side (or a forward side) of the electromagnetic valve unit, and right and left sides as viewed in FIG. 1 will be described as right and left sides of the electromagnetic valve unit.

[0029] The electromagnetic valve unit 1 of the present invention is, for example, provided at a vehicle such as an automobile. The electromagnetic valve unit 1 is attached to a buffer device 10 (also referred to as control equipment), which is configured to mitigate vibration transmitted from a road surface to a vehicle body during running and which is used together with a spring, to control the flow rate of fluid passing through a piston 14, thereby adjusting damping force provided by the buffer device 10.

[0030] First, a configuration of the buffer device 10 will be described. As illustrated in FIG. 1, the buffer device 10 includes a tubular cylinder 11 housing the fluid, a piston rod 12 movable relative to the cylinder 11 in an axial direction, and the piston 14 provided at an end portion of the piston rod 12 and provided with a piston ring 13 at the outer periphery. The piston 14 divides a space inside the cylinder 11 into a first liquid chamber R1 and a second liquid chamber R2. The piston 14 is in a bottomed tubular shape opening downward (see FIG. 2), and multiple through-holes 14a penetrating the piston 14 in a radial direction are formed in a circumferential direction at positions above the piston ring 13.

[0031] Moreover, as illustrated in FIG. 2, the electromagnetic valve unit 1 is housed in a housing recessed portion 14A as a housing portion of the piston 14, and a tubular body 15 as a pressing member including, at an outer peripheral surface, an external thread portion 15s to be screwed into an internal thread portion 14s provided at a lower-end-side inner peripheral surface of the piston 14 is screwed into and connected to a lower side with respect to the electromagnetic valve unit 1. The electromagnetic valve unit 1 is pressed against a step portion 14b provided at a bottom portion of the piston 14 by an upper end portion 15c of the tubular body 15. Note that the step portion 14b includes a tubular inner peripheral surface 14c forming the housing recessed portion 14A, a horizontal surface 14d as a receiving portion extending from an upper end of the inner peripheral surface 14c in an inner diameter direction, and an inclined surface 14e narrowed as extending upward from an inner-diameter-side edge of the horizontal surface 14d. The electromagnetic valve unit 1 is sandwiched by the horizontal surface 14d and the upper end portion 15c of the tubular body 15.

[0032] Further, a through-hole 14f penetrating the piston 14 in an upper-lower direction is formed at the step portion 14b of the piston 14, and is specifically formed above the inclined surface 14e. An electric wire LN configured to supply power to a later-described coil portion 2 is inserted into the through-hole 14f. Note that the electric wire LN is connected to an external power source through the inside of the piston rod 12.

[0033] Next, a configuration of the electromagnetic valve unit 1 will be described. The electromagnetic valve unit 1 mainly includes the coil portion 2, a solenoid rod 3 as a movable iron core to be moved up and down by the coil portion 2, a valve member 4 connected to a lower end portion of the solenoid rod 3, a tubular member 5 connected to a lower side of the coil portion 2, and an elastic member 7 attached to the coil portion 2.

[0034] The coil portion 2 is a mold coil that a coil is molded with a resin material, and a hole 2a opening downward is formed at a center portion of the coil portion 2. Moreover, a shoulder portion 2b is formed at an upper-end-side corner portion of the coil portion 2, and the elastic member 7 as a later-described ring-shaped annular elastic member is attached to the shoulder portion 2b. Note that the detailed shapes of the shoulder portion 2b and the elastic member 7 will be described later. Further, a stationary iron core 2y is arranged below the coil portion 2.

[0035] An external thread portion 3a is formed at a tip end portion (i.e., the lower end portion) of the solenoid rod 3, and a large portion of the solenoid rod 3 is housed in the hole 2a of the coil portion 2.

[0036] The valve member 4 is in a T sectional shape including a small diameter portion 4a and a large diameter portion 4b provided at an upper end of the small diameter portion 4a, and at an upper center portion of the valve member 4, a hole 4d opening upward and having an internal thread portion 4c at an inner peripheral surface is formed. The valve member 4 and the solenoid rod 3 are connected to each other by screwing of the internal thread portion 4c and the external thread portion 3a.

[0037] The tubular member 5 includes a tubular portion 5a fixed to a lower portion of the stationary iron core 2y and covering the valve member 4 and an annular valve seat portion 5b projecting from a lower end of the tubular portion 5a in the inner diameter direction. Note that the tubular member 5 may be formed integrally with the stationary iron core 2y. The inner diameter of the valve seat portion 5b is greater than that of the small diameter portion 4a of the valve member 4, and is smaller than that of the large diameter portion 4b of the valve member 4. Moreover, multiple through-holes 5c penetrating the tubular portion 5a in the radial direction are formed in the circumferential direction at the tubular portion 5a, and the through-holes 5c are provided at the substantially-same positions as those of the through-holes 14a of the piston 14 in the axial direction (i.e., the upper-lower direction) and are communicated with the through-holes 14a. Further, a spring 6b configured to bias the large diameter portion 4b of the valve member 4 and the valve seat portion 5b in a separation direction is arranged between the large diameter portion 4b and the valve seat portion 5b.

[0038] Next, adjustment of the damping force by the electromagnetic valve unit 1 will be described. In the electromagnetic valve unit 1, the through-holes 14a of the piston 14, the through-holes 5c of the tubular member 5, a lower-end-side opening of the tubular member 5 (i.e., the inside of the valve seat portion 5b), and the tubular body 15 form a flow path allowing communication between the first liquid chamber R1 and the second liquid chamber R2.

[0039] In a non-energization state of the coil portion 2, the solenoid rod 3 is biased upward by biasing force of the spring 6b, the large diameter portion 4b of the valve member 4 and the valve seat portion 5b are separated from each other, and a clearance between the large diameter portion 4b and the valve seat portion 5b is a dimension L1 (see the left side of the solenoid rod 3 of FIG. 2). In an energization state of the coil portion 2, the solenoid rod 3 moves downward against the biasing force of the spring 6b, the large diameter portion 4b of the valve member 4 and the valve seat portion 5b approach or contact each other, and the clearance between the large diameter portion 4b and the valve seat portion 5b is a dimension L2 smaller than the dimension L1 (see the right side of the solenoid rod 3 of FIG. 2).

[0040] That is, the electromagnetic valve unit 1 is configured such that the coil portion 2 is brought into the energization state to narrow the clearance (i.e., the flow path) between the large diameter portion 4b and the valve seat portion 5b and increase the damping force of the buffer device 10 and is brought into the non-energization state to ensure a great clearance between the large diameter portion 4b and the valve seat portion 5b and decrease the damping force of the buffer device 10.

[0041] Next, the elastic member 7 will be described. As illustrated in FIGS. 3 and 4, the elastic member 7 is an annular member made of, e.g., rubber or synthetic resin, and includes an annular portion 7a as a deformation portion having an elongated rectangular sectional shape and an annular protruded portion 7b protruding from a lower-end-side inner peripheral edge of the annular portion 7a in the inner diameter direction. The elastic member 7 is in an L shape as viewed in the section.

[0042] The shoulder portion 2b of the coil portion 2 is in such a shape that the upper-end-side corner portion of the coil portion 2 is cut out in the circumferential direction, and is in a step shape including a horizontal surface 2d horizontally extending from an outer peripheral surface 2c of the coil portion 2 in the inner diameter direction and a vertical surface 2e standing upward from an inner-diameter-side end portion of the horizontal surface 2d. Moreover, an annular recessed portion 2f recessed in the inner diameter direction is formed at a lower end of the vertical surface 2e.

[0043] The elastic member 7 is configured such that the annular portion 7a is fitted onto the vertical surface 2e and the protruded portion 7b is attached to the shoulder portion 2b with the protruded portion 7b being inserted into the recessed portion 2f. In a state in which the elastic member 7 is attached to the shoulder portion 2b, a lower surface 7c of the annular portion 7a contacts the horizontal surface 2d, and an upper surface 7d of the annular portion 7a is arranged above an upper surface 2g of the shoulder portion 2b. That is, the upper-lower dimension of the annular portion 7a is greater than the upper-lower dimension of the vertical surface 2e. Moreover, the outer diameter of the vertical surface 2e of the shoulder portion 2b is slightly longer than the inner diameter of the annular portion 7a of the elastic member 7.

[0044] As described above, the elastic member 7 can be reliably attached to the shoulder portion 2b of the coil portion 2 by clamping force (see a black arrow in an enlarged portion of FIG. 4) of the annular portion 7a in the inner diameter direction and the protruded portion 7b inserted into the recessed portion 2f. Further, the protruded portion 7b is inserted into the annular recessed portion 2f across the circumferential direction. Thus, it is less likely to detach the elastic member 7 from the coil portion 2, and the elastic member 7 can be attached to the shoulder portion 2b of the electromagnetic valve unit 1 with substantially-uniform holding force in the circumferential direction by the clamping force of the annular portion 7a in the inner diameter direction. Particularly, since the protruded portion 7b is inserted into the recessed portion 2f, the protruded portion 7b is hooked on an upper wall portion of the recessed portion 2f. Thus, even if external force in a detachment direction (e.g., an upper direction) acts on the elastic member 7 upon delivery or transportation of the electromagnetic valve unit 1, detachment of the elastic member 7 from the shoulder portion 2b can be prevented.

[0045] As illustrated in FIG. 5, in a state in which the electromagnetic valve unit 1 is housed in the housing recessed portion 14A of the piston 14 and the tubular body 15 is screwed into and connected to the piston 14 (see FIG. 2), the electromagnetic valve unit 1 is pushed up from below by the tubular body 15, and the annular portion 7a of the elastic member 7 is, in the upper-lower direction, sandwiched between the horizontal surface 14d of the piston 14 and the horizontal surface 2d of the shoulder portion 2b.

[0046] As described above, the protruded portion 7b of the elastic member 7 is inserted into and fixed to the recessed portion 2f of the shoulder portion 2b, whereas the annular portion 7a is deformed in the axial direction when the electromagnetic valve unit 1 is pressed to a horizontal surface 14d side of the housing recessed portion 14A. Thus, the electromagnetic valve unit 1 can be easily and accurately attached to the housing recessed portion 14A in a state in which sufficient repulsive force is ensured between the housing recessed portion 14A and the electromagnetic valve unit 1.

[0047] Specifically, since the protruded portion 7b is inserted into the recessed portion 2f, the elastic member 7 is fixed not to drop from the shoulder portion 2b. Thus, it is enough to ensure a small function (i.e., small clamping force) of holding the annular portion 7a on the shoulder portion 2b, and intrinsic stress of the annular portion 7a in the radial direction can be decreased. Thus, the annular portion 7a can be accurately and sufficiently deformed in the axial direction, and sufficient repulsive force can be ensured between the housing recessed portion 14A and the electromagnetic valve unit 1. With this configuration, even if screwing and connection between the piston 14 and the tubular body 15 are loosened due to, e.g., aging, the electromagnetic valve unit 1 can be pressed against the tubular body 15 by repulsive force of the annular portion 7a, and therefore, rattling of the electromagnetic valve unit 1 in the housing recessed portion 14A can be reduced. Moreover, the annular portion 7a has relatively-lower repulsive force than, e.g., that of a typical wave washer, and it is enough to ensure small force when the electromagnetic valve unit 1 is pressed to the horizontal surface 14d side of the housing recessed portion 14A and no high attachment accuracy is required. Thus, the electromagnetic valve unit 1 can be easily attached to the housing recessed portion 14A. Note that the annular portion 7a does not overlap with the protruded portion 7b in an axis line direction, and therefore, intrinsic stress of the protruded portion 7b provides no influence on deformation of the annular portion 7a in the axial direction. In other words, the annular portion 7a is deformable in the axial direction so as not to press the protruded portion 7b in the axial direction.

[0048] Moreover, the annular portion 7a is arranged along the vertical surface 2e of the shoulder portion 2b, and therefore, when the electromagnetic valve unit 1 is inserted into the housing recessed portion 14A, e.g., twisting of the annular portion 7a can be restricted by the shoulder portion 2b and the annular portion 7a can be accurately pinched between the shoulder portion 2b and the horizontal surface 14d.

[0049] Further, the outer diameter of the annular portion 7a is smaller than the inner diameter of the housing recessed portion 14A, and therefore, a clearance is formed between the annular portion 7a and the inner peripheral surface 14c of the housing recessed portion 14A. According to such a configuration, when the electromagnetic valve unit 1 is inserted into the housing recessed portion 14A, the annular portion 7a does not contact the inner peripheral surface 14c of the housing recessed portion 14A, and therefore, the electromagnetic valve unit 1 is easily inserted into the housing recessed portion 14A.

[0050] In addition, when the annular portion 7a is pinched by the horizontal surface 14d and the horizontal surface 2d, the annular portion 7a can be deformed in an outer diameter direction, and therefore, a deformation tolerance of the annular portion 7a in the upper-lower direction can be sufficiently ensured. With this configuration, the repulsive force of the annular portion 7a in the upper-lower direction can be increased, and the horizontal surface 2d of the electromagnetic valve unit 1 and the horizontal surface 14d of the housing recessed portion 14A can be arranged close to each other. Thus, the dimension of the buffer device 10 in the upper-lower direction can be compact. Note that in the present embodiment, the upper surface 7d of the annular portion 7a is at the same height as that of the upper surface 2g of the shoulder portion 2b in a state in which the annular portion 7a is pinched.

[0051] Note that in the first embodiment, the form in which the protruded portion 7b is inserted, specifically loosely fitted, into the recessed portion 2f and the elastic member 7 and the shoulder portion 2b are fixed by the clamping force of the annular portion 7a in the inner diameter direction has been described by way of example, but the protruded portion 7b may be press-fitted in the recessed portion 2f. In this case, the annular portion 7a may be placed apart from the vertical surface 2e of the shoulder portion 2b. That is, the elastic member 7 may be attached to the shoulder portion 2b in a state in which no stress in the radial direction is on the annular portion 7a. Alternatively, the elastic member 7 may be attached to the shoulder portion 2b by repulsive force of the protruded portion 7b press-fitted in the recessed portion 2f and the additionally-acting clamping force of the annular portion 7a in the inner diameter direction.

Second Embodiment

[0052] Next, an electromagnetic valve unit according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 8. Note that configuration description overlapping with that of the above-described embodiment will be omitted.

[0053] As illustrated in FIG. 6, an elastic member 72 in the second embodiment is configured such that protruded portions 72b protruding from an annular portion 7a having an elongated rectangular sectional shape in an inner diameter direction are provided at positions facing each other with respect to the center axis of the annular portion 7a. The protruded portions 72b have the same height as that of the annular portion 7a.

[0054] As illustrated in FIGS. 7 and 8, the elastic member 72 is attached to a shoulder portion 22b of a coil portion 2. Specifically, the shoulder portion 22b is in a step shape including a horizontal surface 22d horizontally extending from an outer peripheral surface 2c of the coil portion 2 in the inner diameter direction and a vertical surface 22e standing upward from an inner-diameter-side end portion of the horizontal surface 22d. Moreover, at the vertical surface 22e, recessed portions 22f recessed in the inner diameter direction are provided at positions facing each other with respect to the center axis. The recessed portions 22f are cut out to open in an upper direction and an outer diameter direction. Note that the left side in the plane of paper of FIG. 7 illustrates a state in which the coil portion 2 is cut at the position of the protruded portion 72b, and the right side in the plane of paper illustrates a state in which the coil portion 2 is cut at a position different from the position of the protruded portion 72b.

[0055] Each protruded portion 72b of the elastic member 72 is press-fitted in the recessed portion 22f of the shoulder portion 22b, and the annular portion 7a is fitted onto the vertical surface 22e. According to such a configuration, the elastic member 72 can be reliably attached to the shoulder portion 22b of the coil portion 2 by repulsive force (see white arrows in an enlarged portion of FIG. 8) of the protruded portion 72b, which is press-fitted in the recessed portion 22f, in a circumferential direction and additionally-acting clamping force (see black arrows in the enlarged portion of FIG. 8) of the annular portion 7a in the inner diameter direction. Note that the annular portion 7a and the protruded portions 72b do not overlap with each other, and therefore, intrinsic stress of the protruded portions 72b provides no influence on deformation of the annular portion 7a in an axial direction.

[0056] Moreover, the protruded portions 72b contact wall portions 22j of the recessed portions 22f in the circumferential direction, and therefore, relative turning of the elastic member 72 and the coil portion 2 is restricted. Note that the recessed portion 22f opens in the upper direction, and therefore, the elastic member 72 can be attached to the shoulder portion 22b from above and attachment of the elastic member 72 is facilitated without the need for arranging the elastic member 72 after diameter expansion thereof.

[0057] Note that in the second embodiment, the form in which two protruded portions 72b of the elastic member 72 and two recessed portions 22f of the shoulder portion 22b are provided has been described by way of example, but the number of protruded and recessed portions and the sizes of the protruded and recessed portions can be freely changed.

Third Embodiment

[0058] Next, an electromagnetic valve unit according to a third embodiment of the present invention will be described with reference to FIGS. 9 and 10. Note that configuration description overlapping with those of the above-described embodiments will be omitted.

[0059] As illustrated in FIG. 9, an elastic member 73 in the third embodiment is configured such that a protruded portion 73b protruding downward from a center portion of a lower surface 7c of an annular portion 7a, which has an elongated rectangular sectional shape, in a radial direction is formed in an annular shape along the annular portion 7a. That is, the annular portion 7a is formed wider in the radial direction than the protruded portion 73b, and from an outer diameter side to an inner diameter side as indicated by a virtual chain line in FIG. 10 for the sake of convenience in description, an outer-diameter-side deformation portion 71a not overlapping with the protruded portion 73b in an axial direction, an intermediate portion 71c overlapping with the protruded portion 73b in the axial direction, and an inner-diameter-side deformation portion 71b not overlapping with the protruded portion 73b in the axial direction are positioned.

[0060] As illustrated in FIG. 10, the elastic member 73 is attached to a shoulder portion 23b of a coil portion 2. Specifically, the shoulder portion 23b is in a step shape including a horizontal surface 23d horizontally extending from an outer peripheral surface 2c of the coil portion 2 in an inner diameter direction and a vertical surface 23e standing upward from an inner-diameter-side end portion of the horizontal surface 23d, and an annular recessed portion 23f is formed along the horizontal surface 23d.

[0061] The protruded portion 73b of the elastic member 73 is press-fitted in the recessed portion 23f of the shoulder portion 23b, and an annular portion 7a is fitted onto the vertical surface 23e. According to such a configuration, the elastic member 73 can be reliably attached to the shoulder portion 23b of the coil portion 2 by repulsive force (see white arrows in an enlarged portion of FIG. 10) of the protruded portion 73b, which is press-fitted in the recessed portion 23f, in the radial direction and additionally-acting clamping force (see a black arrow in the enlarged portion of FIG. 10) of the annular portion 7a in the inner diameter direction. Moreover, attachment directions of the protruded portion 73b and the annular portion 7a are the same as each other (i.e., both corresponding to an upper-lower direction in this embodiment), and therefore, it is not necessary to greatly diameter-expand the protruded portion 73b and assembly of the elastic member 73 with the shoulder portion 23b is facilitated. Further, the outer-diameter-side deformation portion 71a and the inner-diameter-side deformation portion 71b do not overlap with the protruded portion 73b in an axis line direction, and therefore, intrinsic stress of the protruded portion 73b provides no influence on deformation of the outer-diameter-side deformation portion 71a and the inner-diameter-side deformation portion 71b in the axial direction.

[0062] The embodiments of the present invention have been described above with reference to the drawings, but specific configurations are not limited to these embodiments. Even changes and additions made without departing from the scope of the present invention are included in the present invention.

[0063] For example, in the first to third embodiments above, the buffer device 10 has been described as one example of a target to which the electromagnetic valve unit is attached. However, as long as the electromagnetic valve unit is sandwiched between the housing recessed portion and a connection member connected to the control equipment, the electromagnetic valve unit may be attached to another type of control equipment.

[0064] Moreover, in the first to third embodiments above, the form in which the tubular body 15 as the pressing member is screwed into and connected to the housing recessed portion 14A has been described by way of example, but fixing by swaging may be employed. Moreover, the connection member may be freely changed depending on, e.g., use environment where the electromagnetic valve unit is attached and the field of the electromagnetic valve unit.

[0065] Further, in the first to third embodiments above, the form in which an upper surface of the deformation portion of the elastic member is in a flat shape in the circumferential direction has been described by way of example, but the present invention is not limited to such a form. A protrusion may be provided on the upper surface of the deformation portion of the elastic member. According to such a configuration, sandwiching force is concentrated on the protrusion when the deformation portion is, in the axial direction, sandwiched between the receiving portion of the housing recessed portion and the shoulder portion of the electromagnetic valve unit, and therefore, repulsive force in the axial direction can be greatly ensured.

REFERENCE SIGNS LIST

[0066] 1 Electromagnetic valve unit [0067] 2 Coil portion [0068] 2b Shoulder portion [0069] 2f Recessed portion [0070] 3 Solenoid rod (movable iron core) [0071] 7 Elastic member [0072] 7a Annular portion (deformation portion) [0073] 7b Protruded portion [0074] 10 Buffer device [0075] 14A Housing recessed portion (housing portion) [0076] 14d Horizontal surface (receiving portion) [0077] 15 Tubular body (pressing member) [0078] 22b Shoulder portion [0079] 22f Recessed portion [0080] 23b Shoulder portion [0081] 23d Horizontal surface [0082] 23f Recessed portion [0083] 72 Elastic member [0084] 72b Protruded portion [0085] 73 Elastic member [0086] 73b Protruded portion [0087] 700 Elastic member