WO2019039370A1

WO2019039370A1 - Air damper

Info

Publication number: WO2019039370A1
Application number: PCT/JP2018/030388
Authority: WO
Inventors: 正衡趙; 伸弘玉井
Original assignee: 株式会社パイオラックス
Priority date: 2017-08-22
Filing date: 2018-08-16
Publication date: 2019-02-28
Also published as: KR20190021018A

Abstract

Provided is an air damper capable of rapidly switching from a braking force released state to a braking force imparted state, and with which it is possible to obtain a braking force that is stable at all times. This air damper (10) includes a cylinder (20), a piston (30) and a valve body (60), wherein: the piston (30) includes a head portion (31) and a shaft portion (32); a first chamber (R1) and a second chamber (R2) are formed inside the cylinder (20); a communicating hole (37) allowing the first chamber (R1) and the second chamber (R2) to communicate with one another is formed in the head portion (31); a valve seat (38) with which the valve body (60) comes into contact and from which the valve body (60) moves away is formed in an opening portion peripheral edge of one end thereof; the valve body (60) includes a valve main body (61) and an urging leg portion (69) which urges the valve main body (61) toward the valve seat (38); and the urging leg portion (69) is provided on the opposite side of the valve main body (61) to the valve seat (38) and is formed integrally with the valve main body (61).

Description

Air damper

The present invention relates to an air damper used for braking, for example, the opening and closing operation of a glove box of a car.

For example, in an automobile glove box, an air damper may be used to prevent the lid from being suddenly opened and to allow the lid to open gently.

As such an air damper, Patent Document 1 below has a cylinder closed at one end and an open end, and a piston inserted into the cylinder, and an orifice is provided in the piston and the moving direction of the piston An air damper is disclosed in which an opening and closing hole communicating front and rear sides is provided, a recess is provided on an outer periphery of a piston, a sealing member is axially slidably disposed in the recess, and the opening and closing hole is opened and closed. . Also, a piston rod extends from the piston, and the piston rod is connected to the lid of the glove box. Then, when the piston moves in a direction away from the cylinder closing portion, the seal member moves in the recess to close the opening and closing hole, so that a braking force is applied. On the other hand, when the piston is pushed in the direction in which the piston approaches the cylinder closing portion, the seal member moves in the recess to open the opening and closing hole, so the air in the cylinder is discharged and the braking force is released.

JP-A-8-105481

In the air damper, when the piston is pushed toward the cylinder closing portion, the seal member moves in the recess to open the opening and closing hole, and the piston is brought close to the cylinder closing portion. However, when the piston moves from this state in a direction away from the cylinder closing portion, a braking force may not be obtained until the seal member moves in the recess and closes the opening and closing hole. That is, in the air damper, when the piston moves in the cylinder, the seal member in sliding contact with the inner periphery of the cylinder moves in the recess to open and close the opening / closing hole and switch to the applied state or the released state of the braking force However, since this switching depends on the movement of the seal member in the recess, switching from the release state of the braking force to the application state may not be made quickly, and there is a possibility that a stable braking force can not be obtained. The

Therefore, an object of the present invention is to provide an air damper capable of rapidly switching from a state in which the braking force is released to a state in which the braking force is applied, and capable of always obtaining a stable braking force. is there.

In order to achieve the above object, the present invention is an air damper which is attached to a pair of members which are close to and separated from each other and which applies a braking force when both members approach or separate from each other. A head having a moveably inserted piston and a valve body disposed on the piston, the piston having a seal portion for sealing a gap with the inner periphery of the cylinder, and the head And a first chamber located on the piston push-in direction side with the seal portion of the piston as a boundary, and the first chamber located on the piston draw-out direction side. A communication hole is formed in the head of the piston for communicating the first chamber and the second chamber, and the valve body is in contact with or separated from the periphery of one opening of the communication hole. The valve seat is formed The valve body includes a valve body and biasing means for biasing the valve body toward the valve seat, the biasing means being configured to move the valve seat relative to the valve body. Are provided on the opposite side, and are integrally formed with the valve body or the piston.

According to the present invention, when the head of the piston slides in the braking direction, the valve body abuts on the valve seat and closes the communication hole, so that a braking force is applied to the piston and the head of the piston When sliding in the direction opposite to the braking direction, the valve body separates from the valve seat and the communication hole opens, so the air in the first chamber or the second chamber flows into the other chamber through the communication hole. The braking force applied to the piston is released. And since the valve body is always urged toward the valve seat by the valve body biasing means integrally formed on the valve body or the piston, the switching from the open state to the closed state of the valve body can be performed quickly It is possible to always obtain a stable braking force.

It is an exploded perspective view showing one embodiment of the air damper concerning the present invention. It is a perspective view of the air damper. It is a principal part expansion perspective view of the air damper. The valve body which comprises the same air damper is shown, (a) is the perspective view, (b) is the perspective view seen from the direction different from (a). The operating state of the same air damper is shown, and a valve body contact | abuts to a valve seat, and it is explanatory drawing of the state which closed the communicating hole. The operating state of the same air damper is shown, and a valve body separates from a valve seat, and it is an explanatory view of the state where the communicating hole was opened. The other embodiment of the air damper which concerns on this invention is shown, and the principal part enlarged perspective view. The operating state of the same air damper is shown, and a valve body contact | abuts to a valve seat, and it is explanatory drawing of the state which closed the communicating hole. The operating state of the same air damper is shown, and a valve body separates from a valve seat, and it is an explanatory view of the state where the communicating hole was opened.

Hereinafter, an embodiment of the air damper according to the present invention will be described with reference to FIGS.

As shown in FIGS. 1 and 2, the air damper 10 is attached to a pair of members which are close to and separated from each other, and applies a braking force when the members approach or separate from each other. It can be used for damping | braking of the glove box, lid, etc. which were attached so that opening and closing was possible at the opening part of the accommodating part provided in the instrument panel. In the following embodiments, one member is a fixed body such as the housing portion of the instrument panel, and the other member is attached to an opening of the fixed body so as to be openable and closable, such as a glove box or lid Although it demonstrates as an opening-closing body, a pair of members will not be specifically limited if it can mutually approach / disengage.

As shown in FIG. 1, the air damper 10 of this embodiment includes a cylinder 20, a piston 30 slidably inserted in the cylinder 20, a valve body 60 disposed in the piston 30, and a cylinder 20. And a cap 50 attached to the opening 25 of the main body.

As shown in FIG. 1 and FIG. 5, the cylinder 20 of this embodiment has a substantially cylindrical wall 21 extending a predetermined length, and an end wall 22 is provided at one end of the cylinder 20. One end of is closed. However, a through hole may be provided at a predetermined position of the end wall 22 and this may be closed by a cap separate from the cylinder 20. Further, an opening 25 is provided on the other end side of the wall 21, and a plurality of locking holes 27 are formed on the periphery thereof. Furthermore, a plurality of mounting holes 29 are provided on the outside of the wall portion 21, and the cylinder 20 is fixed to one member (instrument panel etc., not shown) via the mounting holes 29. There is.

The cap 50 has a cylindrical insertion wall 51 inserted into the inner periphery of the opening 25 of the cylinder 20 and a lid 53 connected to one end of the insertion wall 51. A plurality of locking claws 51 a are formed on the outer periphery of the insertion wall 51, and the cap 50 is attached to the opening 25 of the cylinder 20 by locking them in the plurality of locking holes 27. Further, a long insertion hole 53a is formed in the lid 53 so that the shaft 32 of the piston 30 can be inserted and removed.

The piston 30 has a head 31 having a seal portion for sealing a gap with the inner periphery of the cylinder 20, and a shaft 32 extending from the head 31. The head 31 has a substantially circular shape whose outer periphery conforms to the wall portion 21 of the cylinder 20 and extends in the axial direction of the cylinder 20 with a predetermined thickness. In addition, a ring attachment groove 33 in the form of an annular groove is formed on the outer periphery of the head 31, and an annular seal ring made of an elastic material such as rubber or elastic elastomer is formed in the ring attachment groove 33. The seal ring 35 is in sliding contact with the inner peripheral surface of the wall portion 21 of the cylinder 20. That is, the seal ring 35 in this embodiment constitutes the "seal portion" in the present invention.

Then, as shown in FIG. 5 and FIG. 6, the first chamber R1 located on the piston pushing direction side (see the arrow F1 in FIG. 6) with the seal ring 35 (seal portion) as a boundary, A second chamber R2 located at (see arrow F2 in FIG. 5) is formed. In this embodiment, the first chamber R1 is formed on the end wall 22 side of the cylinder 20, and the second chamber R2 is formed on the opening 25 side of the cylinder 20.

Further, as shown in FIGS. 5 and 6, a communication hole 37 communicating the first chamber R <b> 1 and the second chamber R <b> 2 is formed at the radial center of the head portion 31. And valve seat 38 which valve element 60 contacts and is separated is formed in one opening peripheral part of communicating hole 37, here opening peripheral side by the side of the 2nd room R2 (refer to Drawing 5 and Drawing 6). Further, as shown in FIGS. 5 and 6, the communication hole 37 of this embodiment extends from the surface of the head 31 on the valve seat 38 side with a constant diameter and a predetermined length, and from the end thereof the first chamber R1. It has a shape that opens gradually toward the side.

As shown in FIGS. 1 and 3, from the surface of the head 31 on the valve seat 38 side, a pair of

support walls

40, 40 are provided so as to be parallel to each other with the communication hole 37 interposed therebetween. Moreover, the axial part 32 in this embodiment has comprised the long-plate shape which has the long axis A and the short axis B in the cross section orthogonal to the axial direction. And each long axis A side of the axial direction one end part 41 (end part by the side of end part wall 22 of cylinder 20) of axial part 32 is set to each support wall so that it may be orthogonal to a pair of

support walls

40 and 40 The respective end portions 41 of the shaft portions 32 are disposed opposite to the communication holes 37 by being respectively connected to the centers in the longitudinal direction of the 40 (see FIG. 5). An accommodating portion 43 surrounded by the end portions 41 of the shaft portion 32 and capable of accommodating and holding the valve body 60 is defined. Both the radial directions of the head portion 31 of the accommodation portion 43 are open, and the valve body 60 can be inserted and accommodated from these openings (see FIG. 1).

Further, as shown in FIG. 5, the end face of the one end portion 41 of the shaft portion 32 supports the biasing means of the valve body 60 (here, the biasing leg portion 69 described later) to press the valve body 61 The support portion 45 is provided. Furthermore, as shown in FIG. 5, a retaining projection 47 in the form of a circular projection is provided at a predetermined location (in this case, the radial center) of the support portion 45. As shown in FIG. 5, on both sides of the retaining projection 47, a pair of

biasing legs

69, 69 of the valve body 60 housed and held in the housing portion 43 are arranged, and the valve body 60 is a housing portion. It does not come off from the 43 opening. Further, a mounting hole 48 is formed at the other axial end of the shaft portion 32, and the piston 30 is fixed to the other member (open / close member etc.) not shown.

In addition, as a head and axial part of a piston, it is not limited to the said shape. For example, the shaft portion may have a prismatic shape, a cylindrical shape, or the like. However, while providing the accommodating part which can accommodate a valve body between a head and one end of an axial part, supporting the energizing means of a valve body and providing the support part which can apply pressing force. preferable.

On the other hand, the valve body 60 includes a valve main body 61 and biasing means for biasing the valve main body 61 toward the valve seat 38. It is provided on the opposite side to the valve seat 38, and integrally formed with the valve body 61 or the piston.

As shown in FIGS. 4 (a) and 4 (b), the valve body 60 of this embodiment has a substantially circular valve body 61, and the valve body 61 is opposite to the valve seat 38. The side forms a flat surface 63. Further, on the flat surface 63 side of the valve main body 61, there are provided a pair of urging

leg portions

69, 69 in the form of tongues that obliquely extend from the outer diameter side toward the inner diameter side. These biasing

legs

69, 69 constitute the "biasing means" in the present invention.

In this embodiment, as shown in FIG. 4 (a), a pair of biasing legs having a fixed width from the portion facing the circumferential direction of the outer peripheral edge portion on the flat surface 63 side of the valve main body 61 69, 69 extend toward the inner diameter side in a gentle curve and are arranged on the same straight line passing through the center of the valve body 61, and the pair of biasing

legs

69, 69 have their tips The free ends are separated from one another, and the biasing legs 69 are elastically deformable.

Further, on the opposite side of the valve main body 61 to the biasing leg portion 69 as the biasing means (opposite to the flat surface 63), a convex facing toward the valve seat 38 and a curved convex A curved surface 65 is formed, and the convex curved surface 65 is in contact with and separated from the valve seat 38. The convex curved surface 65 in this embodiment is such that the top located at the radial center of the valve main body 61 protrudes the highest toward the valve seat 38 side, and is gradually lower from the top toward the outer diameter of the valve main 61 Form a curved surface.

Furthermore, a concave portion 66 with a predetermined depth is formed at the top of the convex curved surface 65 of the valve main body 61, and an orifice 67 communicating the flat surface 63 side and the convex curved surface 65 side of the valve main body 61 is formed at the bottom. (See FIG. 4 (b) and FIG. 5). The orifice may be provided on the piston 30 side.

In the valve body 60 of the present embodiment having the above-described configuration, the valve main body 61 and the pair of biasing

legs

69, 69 serving as biasing means are, for example, thermoplastic elastomer (TPE), rubber, etc. It is integrally formed of the material. The biasing means may be integrally formed with the piston (this will be described in an embodiment described later).

Further, as described above, the biasing means in this embodiment is a pair of biasing

legs

69, 69, the tips of which are separated from each other, but for example, these tips are connected to form a gate. It may be shaped in a circle, or may be provided with a single leg in the shape of a foot, and it may be possible to bias the valve body toward the valve seat 38. In the case where the biasing means is in the form of a gate, it is preferable to provide a retaining hole at a predetermined position thereof in which the retaining protrusion 47 of the piston 30 is inserted.

Further, in the free state in which the biasing leg portion 69 is not elastically deformed, the valve body 60 is a distance L1 between the top of the convex curved surface 65 of the valve main body 61 and the tip of the biasing leg portion 69 in the extension direction. 4A shows, as shown in FIG. 5, the distance L2 (see FIG. 5) between the surface on the valve seat 38 side of the head 31 of the piston 30 and the support 45 of the shaft 32. It is formed to be large.

Then, as shown in FIG. 1, after arranging the arrangement direction D of the pair of biasing legs 69 of the valve body 60 in the opening direction of the housing 43 of the piston 30, one of the housings 43 is As shown in FIG. 5, a pair of biasing

leg portions

69, 69 are disposed on both sides of the retaining projection 47 while inserting the valve body 60 from the opening and bending each biasing leg portion 69. The valve body 60 can be housed and held in the housing portion 43 of the piston 30 by supporting the tip end thereof on the support portion 45.

In the above-mentioned state, since the tip end of the pair of biasing

legs

69, 69 is in contact with and supported by the supporting portion 45 in a state of being elastically deformed, the biasing leg 69 is pressed by the supporting portion 45. As a result, the valve body 61 is biased toward the valve seat 38 by the pair of biasing

legs

69, 69, and the convex curved surface 65 is always in contact with the valve seat 38 (FIG. 5). reference).

In the air damper 10, the valve main body 61 is urged toward the valve seat 38 by the urging force of the pair of urging

legs

69, 69, and the convex curved surface 65 of the valve main body 61 It abuts, and the communication hole 37 is maintained in the closed state. Therefore, as shown by arrow F2 in FIG. 5, when the head portion 31 of the piston 30 slides in a direction away from the end wall 22 of the cylinder 20 (the direction in which the piston 30 is pulled out of the cylinder 20), A braking force is applied to the piston 30.

On the other hand, as shown by arrow F1 in FIG. 6, in the case where the head 31 of the piston 30 slides in the direction close to the end wall 22 of the cylinder 20 (the direction in which the piston 30 is pushed into the cylinder 20), The air in the first chamber R1 presses the convex curved surface 65 of the valve main body 61 through the communication hole 37 to bend and deform the pair of biasing

legs

69, 69 while resisting the biasing force of the valve main body 61. Is pushed away from the valve seat 38 so that the communication hole 37 opens. As a result, the air in the first chamber R1 flows into the second chamber R2, and the braking force applied to the piston 30 is released. The pair of biasing legs 69 can be bent and deformed until the tip end thereof abuts against the retaining projection 47.

Next, the operation and effect of the air damper 10 configured as described above will be described.

First, the assembly work of the air damper 10 will be described. That is, after the seal ring 35 is mounted in the ring mounting groove 33 of the piston 30, as shown in FIG. 1, the valve 60 is inserted from one opening of the housing portion 43, as shown in FIG. The valve body 60 is housed and held in the housing portion 43 of the piston 30 by arranging the pair of biasing

legs

69, 69 on both sides of the retaining projection 47 and supporting the tip end thereof on the support portion 45. can do. Thereafter, the piston 30 is inserted from the head 31 into the cylinder 20, and then the shaft portion 32 of the piston 30 is inserted from the insertion hole 53a of the cap 50, and the plurality of locking claws 51a of the cap 50 The cap 50 is attached to the opening 25 of the cylinder 20 by being locked in the plurality of locking holes 27, respectively, and the air damper 10 can be assembled as shown in FIG.

At this time, in this embodiment, the piston 30 has a housing portion 43 which opens in the radial direction, and the valve body 60 can be inserted into the housing portion 43 from the radial direction of the piston 30 and housed. In the state where the piston 30 in which the valve body 60 is housed in the housing portion 43 is inserted into the cylinder 20, the opening of the housing portion 43 is surrounded by the inner circumference of the cylinder (here, the wall portion 21 of the cylinder 20) The sliding of the piston 30 can reliably prevent the valve body 60 from being detached from the housing portion 43.

In the air damper 10, the valve body 61 is normally urged toward the valve seat 38 by the biasing force of the pair of biasing

legs

69, 69, and the convex curved surface 65 of the valve body 61 is a valve. The communication hole 37 is maintained in a closed state by coming into contact with the seat 38. Therefore, the other member such as the open / close member is opened to one member such as the instrument panel, and the head 31 of the piston 30 is separated from the end wall 22 of the cylinder 20 as shown by arrow F2 in FIG. When sliding in the separating direction, the convex curved surface 65 of the valve main body 61 abuts on the valve seat 38, and the communication hole 37 is maintained in a closed state. Since the air flows through the first chamber R1 and the second chamber R2 only through the orifice 67, a braking force is applied to the piston 30, so that the open / close member etc. can be slowly opened.

On the other hand, when a member such as an opening / closing member is closed with respect to a member such as an instrument panel, as shown by arrow F1 in FIG. When sliding in the direction close to the end wall 22), the air in the first chamber R1 presses the convex curved surface 65 of the valve main body 61 constituting the valve body 60 through the communication hole 37, and a pair of urgings The valve body 61 is pushed against the biasing force of the

legs

69, 69, and the convex curved surface 65 is separated from the valve seat 38, the communication hole 37 is opened, and the air in the first chamber R1 is the second chamber. Since the fluid flows into R2, the braking force applied to the piston 30 is released, and the other member such as the open / close member can be smoothly closed.

In the air damper 10, the valve body 61 is always directed to the valve seat 38 by the biasing means (here, a pair of biasing legs 69, 69) integrally formed on the valve body 61. Since the valve main body 61 is separated from the valve seat 38 and the communication hole 37 is opened, the switching from the state in which the communication hole 37 is closed to the state in which the communication hole 37 is closed can be performed quickly. That is, since switching from the state in which the valve body 61 opens the communication hole 37 and the braking force is released to the state in which the valve body 61 closes the communication hole 37 and the braking force is applied can be performed quickly. , You can always get a stable braking force.

By the way, as a valve body used for an air damper, what is called an umbrella type valve may be employ | adopted. Such an umbrella-type valve has an umbrella-like head and a shaft projecting from the center of the back of the head, and can be mounted by inserting the shaft into the mounting hole of the piston. The thin-walled flange portion on the periphery of the head is capable of coming into and coming out of contact with the periphery of a valve seat provided on the piston. When the piston is pulled out, the thin-walled flange portion abuts on the valve seat peripheral edge to close the communication hole of the piston and a braking force is applied. Since the communication hole opens away from the valve seat peripheral edge, the braking force is released. However, such an umbrella-type valve elastically deforms so that the thin-walled flange portion twists up when the piston is pushed in, so that there is a disadvantage that noise is easily generated. If the thin flange portion is thickened to suppress the generation of noise, switching of the open / close state of the communication hole is delayed.

On the other hand, in the air damper according to the present invention, the biasing means for biasing the valve body is provided on the opposite side to the valve seat with respect to the valve body, and the valve body is provided by the biasing means. Since the valve seat is always biased toward the valve seat, it is possible to reliably bias the valve body toward the valve seat while securing the thickness of the valve body, thereby preventing abnormal noise generation when the valve disc is opened or closed. The biasing force can be appropriately adjusted by selecting the shape and structure of the biasing means according to the shape of the air damper to be applied and the required braking force, etc., and the open / close state of the communication hole Switching can be performed quickly. Moreover, it can suppress that noise generate | occur | produces like said umbrella valve.

In this embodiment, when the head portion 31 of the piston 30 slides in the direction away from the end wall 22 of the cylinder 20, the piston 30 is configured to be applied with a braking force. On the contrary, when the head of the piston slides in the direction close to the end wall of the cylinder, a braking force is applied to the piston, and when sliding in the direction away from the piston, the braking force is released. You may In this case, for example, with respect to the head of the piston, the valve body is disposed on the side of the first chamber R1 of the cylinder, the biasing means is directed to the end wall side of the cylinder, and the valve body is on the opening side of the cylinder Position to face. Then, when the head slides in the direction approaching the end wall side of the cylinder, air flows from the first chamber R1 to the second chamber R2 only through the orifice provided in the piston and the valve body. The braking force is applied to the piston. On the other hand, when the head slides in a direction away from the end wall of the cylinder, the air on the second chamber R2 side pushes the valve main body away from the valve seat, and the air on the first chamber R1 side As a result, the braking force applied to the piston is released.

Further, in this embodiment, as shown in FIG. 5 and FIG. 6, the pair of biasing

leg portions

69, 69 as biasing means are integrally formed with the valve main body 61, and the piston 30 is There is provided a support 45 which applies a pressing force to the valve main body 61 by abuttingly supporting the tips of the pair of biasing legs 69, which are biasing means. Thus, in this embodiment, the biasing means is integrally formed with the valve body 61 and the biasing means is supported by the support 45 of the piston 30 so that the valve body 60 is held in place on the piston 30 It's easy to do.

Furthermore, in this embodiment, as shown in FIG. 5, the valve body 61 has a convex curved surface 65 on the side opposite to the biasing means (a pair of biasing legs 69, 69). Since the valve seat 38 is brought into contact with and separated from the valve seat 38, the sealing performance of the valve body 61 with respect to the valve seat 38 can be favorably maintained even if the valve body 60 is displaced relative to the valve seat 38.

Further, in this embodiment, as shown in FIG. 4 (a) and FIG. 5, the biasing means (here, the pair of biasing legs 69, 69) are from the outer diameter side of the valve main body 61 to the inner diameter side. Since it has a shape extending obliquely, the valve body 60 and the support portion 45 can both be made into a compact shape.

7 to 10 show another embodiment of the air damper according to the present invention. It is to be noted that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

The air damper 10A of this embodiment is different from the above embodiment in the structure of the valve body. As shown in FIG. 7, the valve body 60 in this embodiment is a long plate-like valve main body 61A disposed between a pair of

parallel support walls

40 and 40, and the valve main body 61A And biasing means for biasing the seat 38. The biasing means of this embodiment includes a pair of biasing

legs

69A, 69A extending in the direction away from each other from both side edges along the long axis A of the support portion 45 of the shaft portion 32 constituting the piston 30. It consists of Note that the pair of biasing

legs

69A, 69A extend from alternate positions from both side surfaces along the long axis A direction of the shaft 32. Further, the biasing

legs

69A, 69A are integrally formed with the piston 30. The valve main body 61A is inserted and disposed in the housing portion 43 defined between the pair of

support walls

40 and 40 and between the support portions 45 of the shaft portion 32, thereby attaching the valve main body 61A to the valve seat 38. It is sandwiched between a pair of biasing

legs

69A, 69A which are biasing means.

Further, as shown in FIG. 8, the distal ends of the pair of biasing

legs

69A, 69A bias the valve body 61A in the form of a long plate toward the valve seat 38 side, and the valve main body is always on. 61 abuts on the valve seat 38 to keep the communication hole 37 closed. Therefore, as shown by arrow F2 in FIG. 8, when the head 31 of the piston 30 slides in the direction away from the end wall 22 of the cylinder 20 (the direction in which the piston 30 is pulled out of the cylinder 20), A braking force is applied to the piston 30.

On the other hand, as shown by arrow F1 in FIG. 9, when the head 31 of the piston 30 slides in the direction close to the end wall 22 of the cylinder 20 (the direction in which the piston 30 is pushed into the cylinder 20), The air in the first chamber R1 presses the valve main body 61A of the valve body 60 through the communication hole 37, causing the pair of biasing

legs

69A and 69A to bend and deform while a long plate-like valve main body When the valve body 61A is separated from the valve seat 38, the communication hole 37 is opened. As a result, the air in the first chamber R1 flows into the second chamber R2, and the braking force applied to the piston 30 is released.

And, in the air damper 10A in this embodiment, the valve main body 61 is always biased toward the valve seat 38 by the pair of biasing

legs

69A, 69A integrally formed on the piston 30, so the valve body From the state in which the communication hole 37 is opened by separating the valve seat 38 from the valve seat 38, switching to the state in which the communication hole 37 is closed can be performed quickly, and a stable braking force can always be obtained.

Further, in this embodiment, the pair of biasing

legs

69A, 69A as biasing means are integrally formed with the piston 30, and the valve main body 61A is held between the valve seat 38 and the biasing means. Therefore, the valve body 60A can be easily held at the predetermined position of the piston 30.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the present invention, and such embodiments are also included in the scope of the present invention. .

10, 10A Air damper 20 Cylinder 30 Piston 31 Head 32 Shaft 35 Seal ring (seal portion)
38 valve seat 43 housing portion 45 support portion 50

cap

60,

60A valve body

61, 61A valve main body 65 convex curved surface 67

orifice

69, 69A biasing leg (biasing means)
R1 Room 1 R2 Room 2

Claims

An air damper which is attached to a pair of members close to and separated from each other and applies a braking force when the members approach or separate from each other.
A cylinder, a piston slidably inserted in the cylinder, and a valve body disposed in the piston;
The piston has a head portion having a seal portion for sealing a gap with the inner periphery of the cylinder, and a shaft portion extending from the head portion.
In the cylinder, a first chamber located on the piston pushing direction side and a second chamber located on the piston withdrawal direction side are formed with the seal portion of the piston as a boundary.
A communication hole for communicating the first chamber and the second chamber is formed in the head of the piston, and a valve seat for contacting and separating the valve body is formed in the periphery of one opening of the communication hole. Yes,
The valve body includes a valve body and biasing means for biasing the valve body toward the valve seat, the biasing means being opposite to the valve seat with respect to the valve body. An air damper provided on a side and integrally formed with the valve body or the piston.
The biasing means is integrally formed with the valve body,
The air damper according to claim 1, wherein the piston has a support portion which supports the biasing means and applies a pressing force to the valve body.
The biasing means is integrally formed with the piston,
The air damper according to claim 1, wherein the valve body is sandwiched between the valve seat and the biasing means.
The air damper according to any one of claims 1 to 3, wherein the valve body has a convex curved surface on the side opposite to the biasing unit, and contacts and separates the valve seat with the convex curved surface.
The air damper according to claim 2, wherein the biasing means has a shape extending obliquely from the outer diameter side to the inner diameter side of the valve body.
The said piston has the accommodating part opened to radial direction, The said valve body can be inserted and accommodated in this accommodating part from the radial direction of the said piston, The any one of Claim 1 to 5 is made possible. Air damper as described in