WO2018174025A1

WO2018174025A1 - Air damper

Info

Publication number: WO2018174025A1
Application number: PCT/JP2018/010891
Authority: WO
Inventors: 加藤　幸一
Original assignee: 株式会社パイオラックス
Priority date: 2017-03-24
Filing date: 2018-03-19
Publication date: 2018-09-27
Also published as: JPWO2018174025A1; JP6786708B2

Abstract

Provided is an air damper that is easy to assemble and work with, and that can reliably minimize deformation of a wall of a cylinder even when the cylinder is thinned. This air damper 10 has a cylinder 20, a piston 40, a rod 50, and a cap 60; a wall part 21 of the cylinder 20 has a cross-sectional shape in which the cross-section orthogonal to the axial direction of the wall part has a major axis and a minor axis, the wall part having a pair of major-axis wall parts 25, 25 and a pair of minor-axis wall parts 26, 26; the cap 60 has a cover wall 61 having a major axis and a minor axis; and when the cap 60 has been fitted over an opening part 23 in the cylinder 20, the cover wall 61 has pushing parts 70 disposed on the outer sides of the major-axis wall parts 25 and support parts 75 disposed on the inner sides of the major-axis wall parts 25.

Description

Air damper

The present invention relates to an air damper used for braking such as opening / closing operation of a glove box of an automobile, for example.

For example, in an automobile glove box, an air damper may be used in order to prevent the lid from opening suddenly and to open it gently. This type of air damper is often composed of a cylinder and a piston slidably disposed in the cylinder. However, since the cylinder is cylindrical, it is difficult to reduce the thickness of the cylinder.

Therefore, an air damper having a cylinder whose cross-sectional shape has a major axis and a minor axis is used. As this type of conventional air damper, the following Patent Document 1 includes a piston provided with a rod and a cylinder that houses the piston, and the cylinder includes a width side wall portion and a thickness wall portion, and the movement of the piston. A damper having a flat cross-sectional shape in a direction perpendicular to the direction is described.

Further, through holes are respectively formed on the opening side of the pair of wide side wall portions constituting the cylinder, the pin body is inserted into the through holes, the tip portions thereof are caulked, and the caulking portions are By being formed, a pair of width side wall parts are mutually connected via the pin body.

International Publication WO2016 / 185983 A1

Incidentally, in the case of a cylinder having a major axis and a minor axis as described above, there is a concern about the rigidity of the pair of wall portions along the major axis, as compared to a cylindrical cylinder. In particular, on the opening side of the cylinder, a pair of wall portions along the long axis may be crushed so as to narrow each other, or may be spread each other,

In the damper of Patent Document 1, the openings of the pair of wide side wall portions of the cylinder are connected to each other by the pin body, and the pair of wide side wall portions are spread by the caulking portion and the head portion of the pin body. Although it can suppress, crushing of a pair of width side wall part cannot be suppressed. Further, since the pin body is inserted into the through hole and the tip thereof is crimped, the assembly work of the damper becomes complicated.

Therefore, an object of the present invention is to provide an air damper that can reliably suppress deformation of the wall portion of the cylinder and has good assembly workability even if the cylinder is thinned.

In order to achieve the above object, the present invention is an air damper that is attached to a pair of members that are close to and away from each other and applies a braking force when both members are close to or separate from each other, and has a wall portion that extends in a cylindrical shape. A cylinder having an end wall at one end and an opening at the other end, a piston slidably inserted into the cylinder, a rod extending from the piston, and an opening in the cylinder The wall portion of the cylinder has a cross-sectional shape having a major axis and a minor axis, and is opposed to the major axis as a boundary. And a pair of short axis walls disposed opposite to each other with the short axis as a boundary, and the cap includes an opening of the cylinder. A cover wall covering the cover wall, The rod has a shape having a long axis and a short axis that match the wall of the cylinder, and a rod insertion / extraction opening for inserting the rod is formed, and the cap is attached to the opening of the cylinder, The cover wall includes a pressing portion disposed outside each long-axis wall portion of the cylinder and a support portion disposed inside each long-axis wall portion.

According to the present invention, when the cap is attached to the opening of the cylinder, the holding portion of the cover wall is disposed outside the long-axis wall portion of the cylinder, and the long-axis wall portion is about to deform outward. In addition, the deformation is pressed from the outside, and the support portion of the cover wall is arranged inside the long axis wall portion of the cylinder, and the deformation is supported from the inside when the long axis wall portion is going to be deformed inward. Therefore, even if the cylinder is thinned, the deformation of the wall of the cylinder can be reliably suppressed by a simple operation of simply attaching the cap to the opening of the cylinder.

1 is an exploded perspective view showing a first embodiment of an air damper according to the present invention. It is a perspective view of the air damper. It is a principal part expansion perspective view of the same air damper. The operation state of the air damper is shown, (a) is an explanatory view of the state where the piston is in contact with the end wall of the cylinder, (b) is the description of the state where the piston is moved a predetermined distance from the end wall of the cylinder FIG. 4C is an explanatory view showing a state where the piston is farthest from the end wall of the cylinder. It is sectional drawing at the time of seeing the cylinder which comprises the air damper from the direction orthogonal to the axial direction of an air damper. (A) is an enlarged explanatory view of the main part of the same air damper in a state where the piston is farthest from the end wall of the cylinder, and (b) is a cross-sectional view taken along the line G1-G1 in FIG. 6 (a). . 6A is a cross-sectional view taken along the line G2-G2 in FIG. 6A, and FIG. 6B is a cross-sectional view taken along the line G3-G3 in FIG. The 2nd Embodiment of the air damper which concerns on this invention is shown, and it is the principal part expansion perspective view. (A) is an enlarged explanatory view of the main part of the same air damper in a state where the piston is farthest from the end wall of the cylinder, and (b) is a cross-sectional view taken along line G4-G4 in FIG. 9 (a). . The 3rd Embodiment of the air damper which concerns on this invention is shown, and it is the principal part expansion perspective view. (A) is an enlarged explanatory view of the main part of the same air damper with the piston farthest from the end wall of the cylinder, and (b) is a sectional view taken along the line G5-G5 in FIG. 11 (a). .

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

As shown in FIG. 2, the air damper 10 is attached to a pair of members that are close to and away from each other, and applies a braking force when both members are close to or separate from each other. It can be used for braking, such as a glove box and a lid attached to the opening of the accommodating portion provided in the door so as to be opened and closed. In the following embodiments, one member is a fixed body such as an instrument panel housing, and the other member is attached to the opening of the fixed body so as to be openable and closable, such as a glove box and a lid. Although described as an openable / closable body, the pair of members is not particularly limited as long as they are close to and away from each other.

As shown in FIG. 1, the air damper 10 of this embodiment includes a cylinder 20 having a wall portion 21 that extends in a cylindrical shape, a piston 40 that is slidably inserted into the cylinder 20, and an attachment to the piston 40. The seal ring 43, the rod 50 extended from the piston 40, the valve body 55 accommodated in the valve body accommodating portion 52 formed in the piston 40, and the opening 23 of the cylinder 20 are mounted. The cap 60 is mainly configured.

As shown in FIG. 1 and FIG. 4, the cylinder 20 has a wall portion 21 that extends in a cylindrical shape with a predetermined length, an end wall 22 is provided at one end thereof, and one end side of the cylinder 20 is closed. Yes. However, a through hole may be provided at a predetermined location on the end wall 22 and closed with a cap separate from the cylinder 20. In addition, the opening 23 is provided on the other end side of the wall portion 21 so that the cap 60 is attached.

Further, as shown in FIG. 5, the wall portion 21 of the cylinder 20 has a long axis A and a short axis B in a cross section orthogonal to the axial direction (direction along the axial center C). The wall portion 21 has a long extending annular cross-sectional shape, and the wall portion 21 is separated from a pair of long-

axis wall portions

25 and 25 arranged opposite to each other with the major axis A as a boundary. And a pair of short

axis wall portions

26, 26 arranged to face each other. More specifically, the wall portion 21 in this embodiment extends in a straight line along the long axis A direction (hereinafter also simply referred to as “long axis direction”), and is disposed so as to face each other in parallel. In addition, a pair of

short axis walls

25, 25 and a pair of short axes arranged on the short axis B side, connecting both ends of the pair of

long axis walls

25, 25, and having a bent shape in an arc shape. It has

shaft wall portions

26 and 26. The wall portion may be, for example, an elliptical shape, a rectangular shape, etc., has a cross section having a major axis and a minor axis, and a pair of major axis wall portions opposed to each other with the major axis as a boundary, and a short Any shape having a pair of short axis wall portions opposed to each other with an axis as a boundary is acceptable, and the shape is not limited to the above.

Further, as shown in FIGS. 1 and 4, a mounting portion 22a is provided from the outer surface of the end wall 22, and the cylinder 22 is connected to an opening / closing mechanism such as a glove box or a lid (not shown) via the mounting portion 22a. 20 can be attached. Furthermore, on the opening 23 side of each long-axis wall portion 25 and at both ends on the long-axis A side, locking

holes

28 and 28 each having a long hole shape are formed (see FIG. 3). ).

Further, as shown in FIG. 3, the outer surface of each long-axis wall 25 on the opening 23 side is formed in a substantially square shape on the inner side in the long-axis direction than the pair of

locking holes

28, 28. The

recesses

30 and 30 are respectively formed at a predetermined depth, and a total of four recesses 30 are provided. The

concave portions

30 and 30 provided in one long-axis wall portion 25 and the

concave portions

30 and 30 provided in the other long-axis wall portion 25 are arranged in alignment with the long-axis direction of the cylinder 20.

Each recess 30 is formed with a depth that reaches almost half of the thickness direction of the long-axis wall 25. And the press part 70 (after-mentioned) which made the protrusion piece of the cap 60 shown by FIG. 3 each enters each recessed part 30 (refer Fig.7 (a)). The concave portion may be, for example, a semicircular shape, a long groove shape that extends long in the extending direction of the wall portion 21, or a wide shape that extends along the long axis direction of the long axis wall portion 25. The depth of the recess is not particularly limited.

Further, as shown in FIG. 3, on the opening 23 side of each long-axis wall portion 25, approximately in the center in the width direction (long-axis direction) of each recess 30 is along the extending direction of the wall portion 21. Each extending slit 32 is formed. A rib 73 (described later) of the cap 60 shown in FIG. 3 is inserted into the slit 32 (see FIG. 2). As shown in FIG. 3, the inner peripheral edge of the slit 32 has a slightly rounded shape.

As shown in FIG. 1 and FIG. 2, the piston 40 has a shape that extends long in one direction so as to match the cross-sectional shape of the cylinder 20, and a ring mounting groove 41 is formed on the outer periphery thereof. An annular seal ring 43 made of an elastic material such as rubber or elastic elastomer is mounted in the ring mounting groove 41, and the seal ring 43 is in sliding contact with the inner peripheral surface of the wall portion 21 of the cylinder 20. 4B, 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 23 side with the seal ring 43 as a boundary. It has become. In addition, protrusions 45 are provided so as to protrude from both ends of the piston 40 in the longitudinal direction and from surfaces facing the opening 23 side of the cylinder 20.

As shown in FIG. 1, the rod 50 has a cross-sectional shape extending in one direction corresponding to the wall portion 21 of the cylinder 20, and is extended from the center in the longitudinal direction of the piston 40. A mounting portion 51 is provided. The piston 40 is attached to an opening / closing mechanism such as a glove box or a lid (not shown) via the attachment portion 51. In addition, a valve body accommodating portion 52 having a circular concave shape is formed on one side surface along the longitudinal direction on the axial base end side of the rod 50. As shown in FIG. 1, a communication passage 53 that connects the first chamber R 1 and the second chamber R 2 is formed on the bottom surface of the valve body housing portion 52. Further, a valve body 55 that opens and closes the opening of the communication passage 53 is accommodated in the valve body accommodating portion 52. The valve body 55 normally closes the opening of the communication passage 53.

Then, from the state where the communication passage 53 is closed by the valve body 55, the piston 40 slides in the braking direction (the direction in which the piston 40 moves away from the end wall 22 of the cylinder 20) as shown by the arrow in FIG. When moved, the inside of the first chamber R1 is depressurized, so that a braking force is applied to the piston 40. On the other hand, as shown by the arrow in FIG. 4C, when the piston 40 slides in the direction opposite to the braking direction (the direction in which the piston 40 is close to the end wall 22), the communication path 53 is opened, and the first The air in the chamber R1 passes through the communication passage 53 and is exhausted to the second chamber R2 side, so that the braking force applied to the piston 40 is released.

In this air damper, contrary to the above, when the piston slides in a direction close to the end wall of the cylinder, a braking force is applied to the piston, and when the piston slides in a direction away from the piston, the braking force is applied. May be canceled.

Next, the cap 60 attached to the opening 23 of the cylinder 20 will be described.

1 and 2, the cap 60 of this embodiment has a cover wall 61 that covers the opening 23 of the cylinder 20. Further, the cover wall 61 has a shape having a long axis A and a short axis B that match the wall portion 21 of the cylinder 20, and a rod insertion port 63 through which the rod 50 is inserted is formed. The rod insertion / exit 63 is formed in a long hole shape at the center of the cover wall 61 in the long axis direction.

Referring also to FIG. 3, frame-like portions 65 each having a frame shape project from both ends of the cover wall 61 in the long axis direction and from the back side thereof. In addition, the back surface of the cover wall 61 means the surface which faces a cylinder inward in the state which attached the cap 60 to the opening part 23 of the cylinder 20, as shown in FIG. On both side walls of each frame-like portion 65 along the long axis A, a locking portion 67 that can be bent is formed through a slit 67a. Further, as shown in FIG. 6B, the cap 60 is attached to the opening 23 of the cylinder 20 by the locking portions 67 being locked in the locking holes 28 of the cylinder 20. (See FIG. 2).

When the piston 40 slides farthest away from the end wall 22 of the cylinder 20 (see FIG. 4C), as shown in FIG. 6B, the piston 40 has the pair of frame-shaped portions. Since the piston 40 abuts against the front end surfaces of the

cylinders

20 and 65, the piston 40 is prevented from coming off from the opening 23 of the cylinder 20, and in this state, the piston 40 is disposed behind the pair of

bendable locking portions

67 and 67. Therefore, the bending of each locking portion 67 is restricted, the locking release from the locking hole 28 is prevented, and the cap 60 from falling off the opening 23 is prevented. Yes.

Further, in the air damper 10, as shown in FIG. 7A, the cover wall 61 is formed on each long axis wall portion 25 of the cylinder 20 with the cap 60 attached to the opening portion 23 of the cylinder 20. It has a pressing part 70 arranged on the outer side and a support part 75 arranged on the inner side of each long-axis wall part 25. In FIG. 7A, the rod 50 is omitted for convenience.

2 and 3 together, the holding portion 70 in this embodiment forms a protruding piece that protrudes from the back surface side of the cover wall 61 toward the end wall 22 of the cylinder 20. In addition, the presser portion 70 that forms the protruding piece is formed in a substantially square shape that conforms to the shape of the recess 30, and is a thin-walled piece that has a thickness that conforms to the depth of the recess 30. In a state where the cap 60 is attached to the opening 23, the cap 60 is fitted into the concave portion 30 so as not to protrude from the outer surface of the long-axis wall portion 25 of the cylinder 20 as shown in FIG.

However, the presser part may protrude from the recess 30 and protrude from the outer surface of the long-axis wall part 25 when the cap is attached to the opening part 23 of the cylinder 20. In addition, as the pressing portion, for example, a semicircular protruding piece, a protruding piece that extends long in the extending direction of the wall portion 21, or a wide protruding portion that extends along the long axis direction of the long axis wall portion 25 is used. It may be a piece, as long as it is arranged outside the outer surface of the long wall portion 25 of the cylinder 20 when the cap is attached to the opening of the cylinder.

Further, as shown in FIG. 6A, when the cap 60 is viewed from the direction of the short axis B of the cover wall 61, the presser portion 70 is formed on both sides of the axis 20 of the cylinder 20 as a boundary. Has been placed. Further, as shown in FIG. 6A, the pressing portion 70 is formed from the inside to the outside of the rod insertion / exit 63 when the cap 60 is viewed from the direction of the short axis B of the cover wall 61. The holding portion 70 of this embodiment is formed from the inner side to the outer side of the rod insertion / outlet 63 at both peripheral edges along the minor axis B of the cover wall 61 of the rod insertion / extraction port 63. Further, in this embodiment, the holding portions 70 are respectively disposed on the pair of side edges along the long axis A of the cover wall 61, and a pair is provided on each side edge along the long axis A of the cover wall 61. In total, four presser portions 70 are provided. Note that the arrangement and number of the presser portions 70 are not limited to this mode. Furthermore, the

presser portions

70 and 70 provided at the side edge portion along one long axis A of the cover wall 61 and the

presser portions

70 and 70 provided at the side edge portion along the other long axis A are: The cover wall 61 is disposed at a position aligned with the long axis direction.

Further, as shown in FIG. 3, the cap 60 is provided with a rib 73 that connects the holding portion 70 and the support portion 75 in a direction along the short axis B of the cover wall 61. This rib 73 consists of a pair of rods 63 that are respectively arranged on both sides of the rod insertion / exit 63 along the long axis A of the cover wall 61. Further, each rib 73 is arranged on the short axis B of the cover wall 61 so as to connect the

presser portions

70, 70 arranged in alignment with both side edges along the long axis A of the cover wall 61. It has a plate shape with a flat surface and extends from the periphery of the rod insertion / exit 63 on the back side of the cover wall 61. Furthermore, each rib 73 enters the slit 32 provided in the cylinder 20 in a state where the cap 60 is attached to the opening 23 of the cylinder 20 (see FIG. 2). And the support part 75 is connected with the front end side of this rib 73. As shown in FIG.

As shown in FIG. 3 and FIG. 6A, the support portion 75 is composed of a pair of rods arranged on both sides of the rod insertion / exit 63 along the long axis A of the cover wall 61. Each support portion 75 includes a plate-like plate-like portion 77 having a flat surface along the short axis B of the cap 60 and extending toward the end wall 22 side of the cylinder 20. . The base end portion of the plate-like portion 77 is connected to the tip end side of the rib 73. In other words, the plate-like portion 77 extends from the tip end side of the rib 73 toward the end wall 22 side of the cylinder 20. It is installed.

Further, as shown in FIG. 7A, the long-axis wall is formed in a state where both end surfaces of each plate-like portion 77 on the short-axis B side of the cap 60 are attached to the opening 23 of the cylinder 20. It arrange | positions inside the

part

25 and 25, respectively, and contact | abuts at the time of bending inside a pair of long

axis wall parts

25 and 25, and has comprised the support surfaces 77a and 77a which support this.

Further, as shown in FIG. 3, the outer surfaces of the pair of plate-like portions 77, 77 (the surface opposite to the opposite surface of the plate-like portions 77, 77) Support ribs 78 that are orthogonal to the plate-like portion 77 are provided so as to project. That is, the support portion 75 in this embodiment has a substantially U-shaped frame shape including a plate-like portion 77 and a pair of

support ribs

78 and 78 arranged orthogonal to both sides of the plate-like portion 77. ing. Each support rib 78 is connected to the back surface of the cover wall 61 across the outer surface of the rib 73 from the front end side in the extending direction of the plate-like portion 77. However, as shown in FIG. 3, the connecting rib side of each support rib 78 with the cover wall 61 is provided with a predetermined gap with respect to the presser portion 70 that forms a protruding piece. Between the support ribs 78, the long axis wall portion 25 of the cylinder 20 can be inserted.

The

support ribs

78, 78 are arranged inside the long-

axis wall portions

25, 25, respectively, as shown in FIG. 7A in a state where the cap 60 is attached to the opening 23 of the cylinder 20. The long-

axis wall portions

25 and 25 are supported when the pair of long-

axis wall portions

25 and 25 are bent inward, and the long-axis wall portion 25 is supported by the both

support surfaces

77a and 77a of the plate-like portion 77. It plays the role of expanding the area.

As shown in FIG. 6A, when the cap 60 is viewed from the direction of the short axis B of the cover wall 61, the holding portion 70 and the support portion 75 (here, the plate-like portion 77 and its support surface 77a) Is provided at a position shifted in the direction of the axis C of the cylinder 20. Further, as shown in FIG. 6A, when the cap 60 is viewed from the short axis B direction of the cover wall 61, the plate-like portion 77 constituting the support portion 75 is arranged in the width direction of the presser portion 70 (the cover wall 61. In the direction along the long axis A).

Further, as shown in FIG. 3 and FIG. 7A, a contact portion 77b is projected from the inner surface of each plate-like portion 77 on the front end side in the extending direction. The abutting portions 77b abut against both side surfaces of the rod 50 in the width direction and prevent the entire plate-like portion 77 from slidingly contacting the side surfaces of the rod 50, thereby smoothing the sliding of the rod 50. is there. Further, as shown in FIG. 3 and FIG. 7B, reinforcing ribs 79 having a substantially triangular plate shape project from the outer surfaces of the plate-like portion 77 and the rib 73, and the plate-like portion 77 and the rib 73. Improvement of rigidity is achieved.

Although the support portion 75 in this embodiment has a substantially U-shaped frame shape, for example, it may be a simple plate shape or the like, and is disposed inside each long-axis wall portion 25 of the cylinder 20 and has a long axis. What is necessary is just to be able to support when the wall part 25 is crushed inside. Further, the arrangement and the number of the support portions 75 are not limited to the above-described aspect.

Next, the function and effect of the air damper 10 having the above configuration will be described.

First, the assembly work of the air damper 10 will be described. That is, the piston 40 and the rod 50 are inserted into the cylinder 20 in a state where the seal ring 43 is attached to the piston 40 and the valve element 55 is accommodated and held in the valve element accommodating part 52, and then the opening 23 of the cylinder 20 is inserted. In order to mount the cap 60, the cap 60 is pushed into the opening 23 of the cylinder 20 while inserting the rod 50 from the rod insertion / exit 63. Then, as shown in FIG. 7A, each support portion 75 is inserted between the long-

axis wall portions

25, 25 of the cylinder 20, and the rib 73 enters the slit 32 of the long-axis wall portion 25. A holding portion 70 that is a protruding piece is fitted into the concave portion 30 of the long shaft wall portion 25, and a plurality of locking portions 67 of the cap 60 are connected to a plurality of engagement portions of the cylinder 20 as shown in FIG. The cap 60 can be attached to the opening 23 of the cylinder 20 by engaging with the stop holes 28 (see FIG. 2). As described above, in the air damper 10, the simple operation of simply locking the locking portion 67 of the cap 60 to the wall portion 21 of the cylinder 20 (here, the locking hole 28 provided in the wall portion 21), The cap 60 can be attached to the opening 23 of the cylinder 20, and the assembly workability of the air damper 10 can be improved.

Then, in a state where the cap 60 is attached to the opening 23 of the cylinder 20, the holding portion 70 of the cover wall 61 is placed outside the

long axis walls

25, 25 of the cylinder 20 as shown in FIG. Therefore, when the long-

axis wall portions

25, 25 are about to be deformed outward, that is, as shown by the arrow F1 in FIG. 7A, the long-

axis wall portions

25, 25 are to be deformed away from each other. Then, the deformation can be suppressed from the outside, and the spread of the long axis wall portion 25 to the outside can be suppressed. Further, in the above state, the support portion 75 of the cover wall 61 is disposed inside the

long axis walls

25 and 25 of the cylinder 20 as shown in FIG. When trying to deform inward, that is, as indicated by the arrow F2 in FIG. 7 (a), when the long-

axis wall portions

25, 25 try to deform in a direction approaching each other, the deformation is supported from the inside. Moreover, the inner side crushing of the long axis wall portion 25 can be suppressed.

As described above, in the air damper 10, the pressing portion 70 of the cover wall 61 is disposed outside the long-axis wall portion 25 of the cylinder 20 with the cap 60 attached to the opening portion 23 of the cylinder 20. When the long axis wall portion 25 is about to be deformed outward, the deformation is suppressed from the outside, and the support portion 75 of the cover wall 61 is disposed inside the long axis wall portion 25 of the cylinder 20, Since the deformation is supported from the inside when the portion 25 is deformed inward, even if the cylinder 20 is thinned, the cylinder 20 can be easily operated by simply attaching the cap 60 to the opening 23 of the cylinder 20. The deformation of the wall portion 21 can be reliably suppressed.

Further, as shown in FIG. 6A, in this embodiment, the support portions 75 are disposed on both sides of the rod insertion / exit 63 along the long axis A of the cover wall 61, and the presser portion 70 is a cap. When 60 is viewed from the direction of the short axis B of the cover wall 61, it is disposed on both sides of the cylinder 20 with the axis C as the boundary. In addition, deformation such as spreading and crushing in the vicinity of the center can be efficiently suppressed.

Further, as shown in FIG. 6A, in this embodiment, the holding portion 70 is formed from the inside to the outside of the rod insertion opening 63 when the cap 60 is viewed from the direction of the short axis B of the cover wall 61. Therefore, the rigidity of the periphery of the both side portions of the rod insertion / exit 63 can be increased, and deformation at that portion can be more efficiently suppressed.

Further, as shown in FIG. 3, the cap 60 in this embodiment is provided with a rib 73 that connects the holding portion 70 and the support portion 75 in the direction along the short axis B of the cover wall 61. Further, the rigidity of the holding portion 70 and the support portion 75 can be improved, and the rib 73 enters the slit 32 provided on the opening portion 23 side of the long-axis wall portion 25 of the cylinder 20. The cap 60 can be attached to the portion 23 with less backlash.

Furthermore, in this embodiment, as shown in FIG. 3 and FIG. 7A, the pressing portion 70 of the cap 60 protrudes from the back surface side of the cover wall 61 toward the end wall 22 of the cylinder 20. A concave portion 30 is formed on the outer surface of each long-axis wall portion 25 of the cylinder 20 on the side of the opening 23 and into which the presser portion 70 formed as a protruding piece enters. Therefore, with the cap 60 attached to the opening 23 of the cylinder 20, the presser 70 that forms a protruding piece enters the recess 30 provided on the outer surface of the long axis wall 25 of the cylinder 20 on the opening 23 side. The protrusion of the presser portion 70 from the outer surface of the long-axis wall portion 25 can be suppressed, and the width along the short axis B of the wall portion 21 of the cylinder 20 can be reduced. Moreover, since the said recessed part 30 is partially formed in the opening part 23 side of the long axis wall part 25 of the cylinder 20, at the time of mold release after the injection molding of the cylinder 20, the opening part of the long axis wall part 25 When the 23 side is pressed with a mold, the pressing surface can be secured to the maximum, and the cylinder can be easily removed.

In this embodiment, as shown in FIG. 6A, when the cap 60 is viewed from the direction of the short axis B of the cover wall 61, the presser portion 70 and the support portion 75 are the axial center of the cylinder 20. Since it is provided at a position shifted in the C direction, the outer surface of the periphery of the opening 23 of the long-axis wall 25 of the cylinder 20 is pressed by the presser 70 and more than the periphery of the opening 23 of the long-axis wall 25. The back side portion is supported by the support portion 75, and the deformation of the long-axis wall portion 25 can be suppressed in a balanced manner in the axial direction of the rod 50.

Further, in this embodiment, as shown in FIG. 7A, the support portion 75 has a plate-like portion 77 having a plane along the short axis B of the cover wall 61, and this plate-like portion. Since both end surfaces of 77 are the support surfaces 77a and 77a inside the long-

axis wall portions

25 and 25 of the cylinder 20, when the long-axis wall portion 25 is about to be deformed inward, the plate-like portion 77 is formed. The long-axis wall portion 25 can be effectively supported by the both end faces 77a and 77a, and the crushing of the long-axis wall portion 25 to the inside can be more effectively suppressed.

Further, as shown in FIG. 3, the support portion 75 has a substantially U-shaped frame shape including a plate-like portion 77 and a pair of

support ribs

78, 78 arranged orthogonal to both sides thereof.

Support ribs

78 and 78 are disposed inside the long-

axis wall portions

25 and 25 of the cylinder 20, respectively, and support the long-

axis wall portions

25 and 25 when bent inward of the pair of long-

axis wall portions

25 and 25. It is supposed to be. Therefore, the support area of both the support surfaces 77a and 77a of the plate-like part 77 can be expanded, and the crushing of the long-axis wall part 25 to the inside can be more effectively suppressed.

8 and 9 show a second embodiment of the air damper according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the air damper 10A of the second embodiment, the structure of the support portion of the cap 60 is different from that of the previous embodiment. As shown in FIG. 8, the support portion 75 A in this embodiment has a plate shape that has a flat surface along the short axis B of the cover wall 61 and extends toward the end wall 22 side of the cylinder 20. The plate-shaped part 77 is provided, and the structure connected with the front end side of the rib 73 is comprised. Further, as shown in FIG. 9A, when the cap 60 is viewed from the short axis B direction of the cover wall 61, the presser portion 70 and the support portion 75A are displaced from each other in the axial center C direction of the cylinder 20. Is provided.

In the air damper 10 A, when the cap 60 is attached to the opening portion 23 of the cylinder 20, the presser portion 70 is connected to the long-

axis wall portions

25, 25 of the cylinder 20 as shown in FIG. 9B. Since the plate-like portion 77 of the support portion 75A is arranged inside the long-

axis wall portions

25 and 25, the presser portion 70 can suppress the spread of the long-axis wall portion 25 to the outside. The plate-like portion 77 can prevent the long-axis wall portion 25 from being crushed inward. In FIG. 9B, the rod 50 is omitted for convenience.

10 and 11 show a third embodiment of the air damper according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the air damper 10B of the third embodiment, the structure of the support portion of the cap 60 is different from that of the above embodiment. As shown in FIG. 10, the support portion 75 B in this embodiment includes a support plate 81 having the same shape as the presser portion 70, disposed with a predetermined gap inside the

presser portions

70 and 70 that form protruding pieces. 81 and a connecting portion 82 for connecting the pair of

support plates

81, 81 to each other. As shown in FIG. 11A, the cap 60 is viewed from the short axis B direction of the cover wall 61. The presser portion 70 and the support portion 75B are provided at a position where they overlap in the direction of the axis C of the cylinder 20. Further, the presser portion 70 and the support plate 81 on the inside thereof are connected to each other via a rib 73 (see FIG. 10) arranged in a direction along the short axis B of the cap 60.

In the air damper 10 B, with the cap 60 attached to the opening portion 23 of the cylinder 20, the presser portion 70 is connected to the long-

axis wall portions

25, 25 of the cylinder 20 as shown in FIG. Since the

support plates

81 and 81 of the support portion 75B are respectively arranged inside the long-

axis wall portions

25 and 25, the presser portion 70 causes the long-axis wall portion 25 to spread outward. The plate-like portion 77 can suppress the crushing of the long-axis wall portion 25 to the inside. In FIG. 11B, the rod 50 is omitted for convenience.

In this embodiment, as shown in FIG. 11A, when the cap 60 is viewed from the direction of the short axis B of the cover wall 61, the presser portion 70 and the support portion 75 B have the axial center of the cylinder 20. Since it is provided at a position overlapping in the C direction, the deformation of the peripheral edge portion of the opening 23 of the long axis wall portion 25 that is particularly easily deformed among the long axis wall portions 25 of the cylinder 20 is prevented. It can suppress effectively in an outer side and the inner side of the long-axis wall part 25. FIG.

It should be noted that the present invention is not limited to the above-described embodiment, and various modified embodiments are possible within the scope of the present invention, and such an embodiment is also included in the scope of the present invention. .

10, 10A, 10B Air damper 20 Cylinder 21 Wall portion 22 End wall 23 Opening portion 25 Long shaft wall portion 26 Short shaft wall portion 30 Recess 32 Slit 40 Piston 50 Rod 55 Valve body 60 Cap 61 Cover wall 63 Rod insertion port 67 Locking part 70 Presser part 73

Rib

75, 75A, 75B Support part 77 Plate-like part 77a Support surface

Claims

An air damper that is attached to a pair of members that are close to and away from each other, and that applies a braking force when both members approach or separate from each other,
A cylinder having a wall extending in a cylindrical shape, having an end wall at one end and an opening at the other end, a piston slidably inserted into the cylinder, and extended from the piston A rod and a cap attached to the opening of the cylinder;
The wall portion of the cylinder has a cross-sectional shape having a major axis and a minor axis in a cross section perpendicular to the axial direction of the cylinder, and a pair of major axis wall portions arranged opposite to each other with the major axis as a boundary. And having a pair of short axis wall portions arranged opposite to each other with the short axis as a boundary,
The cap has a cover wall that covers the opening of the cylinder. The cover wall has a long axis and a short axis that fit the wall of the cylinder, and the rod is inserted into the cap wall. The rod insertion port to be made is formed,
In the state in which the cap is attached to the opening of the cylinder, the cover wall is provided with a holding portion disposed on the outside of each long-axis wall portion of the cylinder and a support disposed on the inside of each long-axis wall portion. And an air damper.
The support portions are disposed on both sides of the rod insertion / exit along the long axis of the cover wall, and the presser portion has the cylinder when the cap is viewed from the short axis direction of the cover wall. The air damper according to claim 1, wherein the air damper is disposed on both sides of the shaft center.
The air damper according to claim 2, wherein the pressing portion is formed from the inside to the outside of the rod insertion / exit when the cap is viewed from the short axis direction of the cover wall.
In the cap, a rib connecting the presser part and the support part is arranged in a direction along the short axis of the cover wall,
The air damper according to any one of claims 1 to 3, wherein a slit into which the rib enters is formed on an opening side of each long-axis wall portion of the cylinder.
The holding part of the cap forms a protruding piece that protrudes from the back side of the cover wall toward the end wall of the cylinder,
The air damper according to any one of claims 1 to 4, wherein a concave portion into which the pressing portion formed as a protruding piece enters is formed on an outer surface of each long axis wall portion of the cylinder on the opening side.
The presser portion and the support portion are provided at positions shifted in the axial direction of the cylinder when the cap is viewed from the short axis direction of the cover wall. Air damper described in one.
The presser part and the support part are provided at a position overlapping the axial center direction of the cylinder when the cap is viewed from the short axis direction of the cover wall. Air damper described in one.
The support portion includes a plate-like portion having a plane along the short axis of the cover wall, and both end surfaces of the plate-like portion are used as support surfaces inside the long-axis wall portions of the cylinder. The air damper according to any one of claims 1 to 7.