WO2023182215A1

WO2023182215A1 - Damper device

Info

Publication number: WO2023182215A1
Application number: PCT/JP2023/010626
Authority: WO
Inventors: 幸一加藤
Original assignee: 株式会社パイオラックス
Priority date: 2022-03-24
Filing date: 2023-03-17
Publication date: 2023-09-28

Abstract

Provided is a damper device which can achieve a size reduction while sufficiently ensuring the stiffness of a rod. This damper device 10 has a cylinder 20 and a piston rod 30, wherein: the piston rod 30 has a rod 40 and a piston 60 having a seal part formed on the outer circumference thereof; an air chamber is formed inside the cylinder 20; the rod 40 has a through-hole 50 passing therethrough in a direction crossing the movement direction of the piston 60; and the piston 60 has an orifice 70 which is provided in a range overlapping the through-hole 50 when the rod 40 is viewed in the axial direction, and which has one end communicating with the through-hole 50 and the other end communicating with the air chamber.

Description

damper device

The present invention relates to a damper device used, for example, for braking the opening and closing operations of a glove box of an automobile.

For example, a damper device is sometimes used in a car glove box to suppress the lid from opening suddenly and allow the lid to open slowly.

As such a damper device, Patent Document 1 below discloses a cylinder having a wall extending in a cylindrical shape and having an opening at the other end, a piston slidably inserted into the cylinder, and a piston that is slidably inserted into the cylinder. A flow path that communicates the internal space surrounded by the connected rod, the closed part of the cylinder, and the piston with the outside, and a braking force that narrows the flow path and applies braking force to the piston when the piston slides in a predetermined direction. An air damper is described in which the applying means and the wall of the cylinder have a cross-sectional shape that is perpendicular to the axial direction and has a long axis and a short axis.

Further, the piston, like the wall of the cylinder, has a cross-sectional shape having a long axis and a short axis, and a small orifice is formed to penetrate through one end of the piston in the long axis direction. Note that the piston is connected to the proximal end of the rod in the axial direction, and has a part that overhangs the outer circumference of the rod (which can also be called a part that is not connected to the rod). An orifice is formed in the.

Japanese Patent Application Publication No. 2015-230017

In the case of the air damper of Patent Document 1, as described above, the piston has an orifice formed in a portion that protrudes beyond the outer circumference of the rod (a portion that is not connected to the rod). Therefore, in order to form an orifice in the piston, it is necessary to secure a sufficient area of the portion not connected to the rod, which makes it difficult to reduce the size of the piston and the overall damper. If the size of the piston were to be made smaller, the size of the rod would also have to be made smaller, making it difficult to ensure the rigidity of the rod.

Therefore, an object of the present invention is to provide a damper device that can be downsized while ensuring sufficient rod rigidity.

In order to achieve the above object, the present invention provides a damper device that is attached between a pair of members that move closer to each other and applies a braking force when the pair of members move closer to each other or move away from each other, the damper device having an opening at one end. and a piston rod movably inserted into the cylinder through the opening, the piston rod having a rod extending a predetermined length and connected to the rod and having an outer periphery. an air chamber is formed in the cylinder on the side in which the piston rod is inserted through the seal portion; A through hole penetrating in a direction intersecting the direction of movement of the piston or a recess formed to be recessed at a predetermined depth in a direction intersecting the direction of movement of the piston is provided; The piston is provided in a range that overlaps the through hole or the recess when the rod is viewed from the axial direction, and one end communicates with the through hole or the recess, and the other end connects to the air chamber. It is characterized by having a communicating orifice formed therein.

In the present invention, the orifice provided in the piston is provided in a range that overlaps the through hole or recess when the rod is viewed from the axial direction, and one end communicates with the through hole or recess and the other end communicates with the through hole or recess. Since it is formed to communicate with the air chamber, it is possible to reduce the size of the piston while maintaining sufficient rod rigidity without changing the rod thickness, allowing for the downsizing of the damper device. can be achieved.

1 is an exploded perspective view showing one embodiment of a damper device according to the present invention. It is a perspective view of the damper device in a state where the piston is pushed in. It is a side view of the piston rod which constitutes the same damper device. 3 is a cross-sectional view taken along the line EE in FIG. 2. FIG. FIG. 2 is an enlarged perspective view of a main part of a piston rod that constitutes the damper device. FIG. 6 is an enlarged perspective view of a piston rod constituting the damper device, viewed from a direction different from that of FIG. 5. FIG. FIG. 3 is a rear view of a piston rod that constitutes the damper device. 3 is a cross-sectional view taken along the line of arrow GG in FIG. 2. FIG. FIG. 3 is a cross-sectional view taken along line DD in FIG. 2; FIG. 9 is an enlarged sectional view of FIG. 9; FIG. 7 shows another embodiment of the damper device according to the present invention, and is a perspective view of a piston rod that constitutes the damper device. FIG. 12 is an enlarged perspective view of a piston rod constituting the damper device, viewed from a different direction from FIG. 11. FIG. 2 is an enlarged cross-sectional view of the main parts of the damper device.

(One embodiment of a damper device)
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a damper device according to the present invention will be described below with reference to the drawings.

The damper device 10 shown in FIGS. 1 and 2 is attached to a pair of members that approach each other and move away from each other, and applies a braking force when the pair of members approach or move away from each other. The present invention can be used for braking a glove box, a lid, etc., which is attached to the opening of the storage section provided in the maintenance panel so as to be openable and closable. In the following embodiments, one member is a fixed body such as an instrument panel accommodating part, and the other member is a glove box, a lid, etc. that is attached to the opening of the fixed body so that it can be opened and closed. This will be explained as an opening/closing body.

As shown in FIG. 1, the damper device 10 of this embodiment includes a cylinder 20 with an opening 23 at one end, and a piston rod 30 that is movably inserted into the cylinder 20. Further, the piston rod 30 includes a rod 40 extending with a predetermined length, and a piston 60 connected to the rod 40 and provided with a seal portion (a seal ring 68 in this embodiment) on its outer periphery. Further, in this damper device 10, a guide cap 80 is attached to the opening 23 on one end side of the cylinder 20.

Furthermore, an air chamber is formed in the cylinder 20 on the side in which the piston rod 30 is inserted through a seal portion (seal ring 68).

More specifically, in the case of this embodiment, as shown in FIG. 9, when the piston rod 30 is inserted into the cylinder 20, the seal ring 68 forming the seal portion is pressed against the inner peripheral surface of the cylinder 20. As a result, the gap between the cylinder 20 and the piston 60 is sealed. As a result, a first air chamber R1 is formed on the side of the cylinder 20 in the insertion direction of the piston rod 30, and a second air chamber R2 is formed on the side of the opening 23 of the cylinder 20. Note that the first air chamber R1 described above constitutes the "air chamber" in the present invention. In addition, the inner circumferential surface of the cylinder 20 in this embodiment means the inner circumferential surface of the wall portion 21 (see FIGS. 4, 9, etc.) that constitutes the cylinder 20, and this also applies in the following description. The same is true.

In addition, in the following description, "one end" or "one end" means one end or one end of the damper device 10 on the damper braking direction side, and "the other end" or "other end" means the damper It means the other end or other end on the return direction side opposite to the braking direction. In addition, the "damper braking direction" in this embodiment means that the piston 60 moves away from the end wall 25 of the cylinder 20 (see FIG. 9), and the amount of the rod 40 pulled out from the opening 23 of the cylinder 20 increases. (See arrow F1 in FIG. 9). Furthermore, in this embodiment, the "return direction opposite to the damper braking direction" (hereinafter also simply referred to as "damper return direction") means that the piston 60 is close to the end wall 25 of the cylinder 20 and the cylinder 20 is It means the direction in which the amount of pushing of the rod 40 increases (see arrow F2 in FIG. 9).

As shown in FIG. 1, the cylinder 20 has a wall portion 21 that extends in a cylindrical shape. Referring also to FIG. 4, this wall portion 21 has a cross section perpendicular to the moving direction of the piston 60 (a direction along the damper braking direction F1 and the damper return direction F2) (a cross section perpendicular to the axial direction of the cylinder 20). ) has an annular shape with a long axis A and a short axis B, and has a thin cylindrical shape (thin box-like cylindrical shape) with a wide width on the long axis A side and a narrow width on the short axis B side. ing. More specifically, the wall portion 21 in this embodiment includes a pair of long-

axis wall portions

21a, 21a that extend linearly in the direction along the long axis A, and are arranged parallel to each other, and a short side wall portion 21a. It has a pair of short

axis wall parts

21b, 21b which are arranged on the axis B side, have an arcuate shape, and connect both ends of the long

axis wall parts

21a, 21a.

In addition, corresponding to the shape of the wall portion 21 described above, the piston 60 also has a shape having a long axis A and a short axis B that fit the inner circumference of the wall portion 21 of the cylinder 20 (this will be explained in detail later). ).

One end of the wall 21 of the cylinder 20 in the axial direction is open, and an opening 23 is provided. In addition,

locking holes

23a, 23a are formed in the long

axis wall portions

21a, 21a, which are located at the periphery of the opening 23 and are arranged to face each other, respectively. Furthermore, as shown in FIG. 9, an end wall 25 is disposed at the other end of the wall 21 in the axial direction, and the other end of the wall 21 is closed.

Further, from the outer surface of the end wall 25 and the outer periphery of the wall portion 21 from one end in the axial direction, a rotation support piece 27 having a rotation hole 27a formed therein is protruded, respectively. A rotation shaft (not shown) of one of the aforementioned members is rotatably inserted into the predetermined rotation hole 27a, so that the outer periphery of the cylinder 20 is rotatably connected to the one member. There is.

As shown in FIG. 1, the guide cap 80 has a rod insertion hole 81 formed in the center thereof, through which the rod 40 can be inserted while the rotation is restricted. It can be inserted into the cylinder 20. Further, a plurality of locking protrusions 82 are protruded from predetermined locations on the outer periphery of the guide cap 80, and each locking protrusion 82 can be locked into a corresponding locking hole 23a of the cylinder 20, respectively. As shown in FIG. 2, a guide cap 80 is attached to the opening 23 of the cylinder 20. This guide cap 80 comes into contact with the piston 60 when the rod 40 is pulled out to the maximum extent from the opening 23 of the cylinder 20, and prevents the piston rod 30 from coming off from the cylinder 20. Further, on the inner periphery of the guide cap 80, a pair of substantially

hemispherical protrusions

83, 83 are provided.

Next, the rod 40 will be explained.

This rod 40 is movably inserted into the cylinder 20 through the opening 23 of the cylinder 20 and slides within the cylinder 20 in the axial direction of the cylinder 20.

As shown in FIGS. 1 and 3, the rod 40 of this embodiment extends to a predetermined length, and has a rotation hole 41a formed at one end 41 in the axial direction, and a rotation hole 41a at the other end 41 in the axial direction. A piston 60 is connected to 43. Note that the axial direction of the rod 40 means a direction along the axis C1 of the rod 40 (see FIGS. 3 and 4). Further, a connecting shaft (not shown) of the other member described above is rotatably inserted into the rotation hole 41a formed in the one end portion 41, so that the rod 40 is rotatably connected to the other member. ing.

Further, as shown in FIG. 4, the rod 40 has a cross-sectional shape having a long axis A and a short axis B, similar to the wall 21 of the cylinder 20 and the piston 60. That is, when the piston 60 is viewed from the axial direction, the rod 40 has a plate shape with a long cross section in the direction of the long axis A of the piston 60 (see FIG. 4).

Further, the rod 40 includes a shaft portion 45 having a long plate shape extending for a predetermined length, and is arranged on both sides of the shaft portion 45 in the direction of the long axis A (also referred to as the width direction). It has

side wall portions

47, 47 projecting like flanges from both

surfaces

45a, 45b in the short axis B direction (also referred to as the thickness direction) of 45. Note that, on the other end 43 side in the axial direction of each side wall portion 47, an upright portion 47a is provided that stands higher than the other portions.

Further, on both

sides

45a and 45b of the shaft portion 45 in the thickness direction, a protruding portion 48 having a concave curved surface 48a is extended at the center portion in the width direction. A pair of convex portions 83, 83 (see FIG. 1) of the guide cap 80 are in sliding contact with these concave

curved surfaces

48a, 48a, so that the sliding movement of the piston rod 30 is guided.

As shown in FIG. 1, FIG. 3, FIG. 5, and FIG. A through hole 50 penetrating in the direction is formed.

In the case of this embodiment, the through hole 50 is formed in the portion of the rod 40 connected to the piston 60, that is, the other end 43 of the rod 40 in the axial direction, in a direction intersecting the moving direction of the piston 60. 40 and is formed to penetrate therethrough. It can also be said that the through hole 50 is formed to penetrate in the short axis B direction of the rod 40 when the rod 40 is viewed in a cross section perpendicular to the axial direction, as shown in FIG. Note that the through hole 50 communicates with a second air chamber R2 provided within the cylinder 20.

Furthermore, the through hole 50 is formed so as to be in contact with a connecting surface 61a (see FIGS. 3 and 5) of the piston 60 and the rod 40. Note that the connecting surface 61a of the piston 60 with the rod 40 is a surface located on the outer surface of the first side wall portion 61 that constitutes the piston 60, which will be described in detail later.

As shown in FIGS. 3 and 10, the through holes 50 are formed inside the other end 43 of the rod 40 in the axial direction, and extend along the axial direction of the rod 40 and are parallel to each other. A pair of

inner surfaces

51, 51 arranged opposite to each other, a surface 52 on the piston 60 side that is orthogonal to the axial direction of the rod 40 and located on the connecting surface 61a of the piston 60, and It has a surface 53 spaced apart from the piston 60, which is orthogonal to the surface 52 and is arranged to face and be parallel to the surface 52 on the piston 60 side. Further, as shown in FIG. 3, when the rod 40 is viewed from the side, the through hole 50 has a substantially rectangular shape that is short in the axial direction of the rod 40 and long in the direction perpendicular to the axial direction.

Note that the formation position of the through hole 50, etc. can also be rephrased as follows. That is, the other end 43 in the axial direction of the rod 40 has a bifurcated portion, and this bifurcated portion is connected to the connecting surface 61a of the outer surface of the first side wall portion 61 of the piston 60, A through hole 50 is formed inside these branched portions so as to contact a connecting surface 61a of the piston 60 with the rod 40.

Next, the piston 60 will be explained.

As shown in FIGS. 1 and 3, the piston 60 of this embodiment is connected to the other end 43 in the longitudinal direction of the rod 40, and has an annular groove 64 formed on its outer periphery. It is integrally formed with.

The annular groove 64 is formed into an annular shape made of an elastic material such as rubber or elastomer, and is fitted with a seal ring 68 that serves as a "sealing part" in the present invention. That is, a “seal portion” is provided on the outer periphery of the piston 60. When the piston rod 30 is inserted into the cylinder 20 while being attached to the annular groove 64, the seal ring 68 is always pressed against the inner peripheral surface of the cylinder 20. Note that "always" means that the piston 60 is in the cylinder 20 in a stationary state, a state in which the piston 60 moves in the damper braking direction F1, and a state in which the piston 60 moves in the damper return direction F2. It means all states (the same applies in the following explanation).

Referring to FIGS. 9 and 10 together, this piston 60 connects the first side wall part 61 and the second side wall part 62, which are arranged parallel to each other and opposite to each other, and the both

side wall parts

61 and 62 to each other. It consists of a connecting wall part 63.

Further, the piston 60 has a shape having a long axis A and a short axis B that fit the inner circumference of the wall 21 of the cylinder 20. Specifically, as shown in FIGS. 4 and 8, the

side walls

61 and 62 constituting the piston 60 are arranged on both sides in the direction of the long axis A so as to match the inner peripheral shape of the wall 21 of the cylinder 20. The surfaces are parallel to each other, and both side surfaces in the short axis B direction are arcuate. Further, the connecting wall portion 63 has a similar shape in which the outer circumference thereof is smaller than the outer circumferences of the both

side wall portions

61 and 62. Note that the

side wall portions

61 and 62 are perpendicular to the axial direction of the cylinder 20 and the rod 40, and the connecting wall portion 63 extends along the axial direction of the cylinder 20 and the rod 40.

Further, the outer surface of the first side wall portion 61, that is, the surface of the first side wall portion 61 opposite to the surface (inner surface) facing the second side wall portion 62 forms a connecting surface 61a with the rod 40. . The piston 60 and the rod 40 are integrated by connecting the other end 43 of the rod 40 in the axial direction to the connecting surface 61a. Note that the axial center C2 of the piston 60 coincides with the axial center C1 of the rod 40 (see FIG. 3).

Furthermore, the space surrounded by the pair of

side walls

61 and 62 and the connecting wall 63 forms an annular groove 64. Furthermore, the outer peripheral surface of the connecting wall portion 63 forms the bottom surface 64a of the annular groove 64.

Further, as shown in FIGS. 3 to 5 and FIG. 8, one (one side) of the portion of the first side wall portion 61 extending along the long axis A is provided with a cutout portion 65 having a predetermined width. ing. As shown in FIG. 3, the notch 65 is formed to be longer than the length of the through hole 50 perpendicular to the axial direction of the rod 40. As shown in FIG. Further, the bottom surface of the notch portion 65 matches the bottom surface 64a of the annular groove 64 (see FIG. 5). A part of the seal ring 68 enters into this notch 65 when the piston 60 moves in the damper return direction F2 (this will be described later).

Furthermore, as shown in FIGS. 3 and 5, a concave groove 66 is formed on the bottom surface 64a of the annular groove 64 and the bottom surface of the notch 65. The concave groove 66 has an opening 66a at one end extending to a connecting surface 61a of the first side wall 61 of the piston 60 with the rod 40, and communicates with the through hole 50. Further, an opening 66b (upper opening) of the concave groove 66 located within the annular groove 64 and located on the outer circumferential side of the piston is closed by a seal ring 68 (one of the seal rings 68 described below). (Occluded except during partial deformation). When the piston 60 moves in the damper return direction F2 and deforms so that a part of the seal ring 68 enters the notch 65, the opening 66b of the concave groove 66 opens. . Note that this concave groove 66 forms an exhaust flow path that exhausts the air in the first air chamber R1 to the second air chamber R2 side when the piston 60 moves in the damper return direction F2. (described later).

Further, as shown in FIG. 10, a plurality of spaces K defined by partition walls 67 are provided inside the both

side walls

61, 62 and the connecting wall 63, and each space K is defined by the second side wall 63. The portion 62 side is open.

As shown in FIG. 8, the piston 60 is provided in a range that overlaps (wraps) the through hole 50 when the rod 40 is viewed from the axial direction, and one end communicates with the through hole 50. , an orifice 70 whose other end communicates with the air chamber (first air chamber R1) is formed.

Specifically, the orifice 70 is arranged so that it overlaps the through hole 50, that is, is located within the range in which the through hole 50 is formed, when the rod 40 is viewed in a cross section perpendicular to the axial direction (see FIG. 8). It is located in Further, the orifice 70 is formed at a position aligned with the axis C2 of the piston 60. That is, the orifice 70 is formed at the center of the piston 60 in the direction of the long axis A and at the center of the direction of the short axis B.

Also, referring to FIGS. 9 and 10, this orifice 70 has a small diameter hole shape.

More specifically, the orifice 70 in this embodiment, as shown in FIG. A base 71 in the shape of a circular tapered hole whose diameter gradually decreases toward one end in the axial direction of the piston 60, and a tip in the shape of a circular hole with a constant diameter extending from one end of the base 71 toward one end in the axial direction of the piston 60. 73.

The other end of the orifice 70 (the other end of the base 71) communicates with the first air chamber R1 via a space K defined on the other end side of the piston 60. One end of the tip portion 73 ) communicates with the through hole 50 . That is, the orifice 70 allows the first air chamber R1 and the second air chamber R2 in the cylinder 20 to communicate with each other via the space K. Note that the damper braking force is adjusted by the flow resistance of the air flowing through the orifice 70.

(Modified example)
The shapes and structures of the cylinder, piston rod, rods and pistons constituting the piston rod, seal rings, orifices, etc. that constitute the damper device of the present invention are not limited to the above embodiments.

Although the wall portion 21 of the cylinder 20 in this embodiment has a thin cylindrical shape, the wall portion of the cylinder may have a substantially rectangular tube shape or a substantially cylindrical shape, for example. In this case, it is preferable that the rod, piston, seal ring, guide cap, etc. also have a shape that corresponds to the cylinder wall.

Further, the cylinder 20 of this embodiment is closed with an end wall 25 disposed at the other end in the axial direction, but for example, a through hole is formed in the end wall disposed at the other end of the cylinder. It is also possible to form a structure in which the through hole is opened and closed by a seal cap.

Further, the rod 40 of this embodiment has a long plate-shaped shaft portion 45, but the rod may include, for example, a shaft portion and a pair of ribs disposed on both sides of the shaft portion. It may have a structure consisting of a side wall or a structure consisting of a prismatic or cylindrical shaft, as long as the piston can be connected.

Further, in this embodiment, the rod 40 is formed with a through hole 50 that penetrates in a direction crossing the moving direction of the piston 60, and has a predetermined depth in the direction crossing the moving direction of the piston 60. A recessed portion may be provided. For example, as shown by the two-dot chain line in FIG. 8, a recess 55 is formed from one surface 45a of the rod 40 in the short axis B direction to a predetermined depth in a direction intersecting the moving direction of the piston 60. Alternatively, although not particularly shown, a recessed portion having a predetermined depth may be formed from the other surface 45b of the rod 40 in the short axis B direction. In this case, one end of the orifice 70 will communicate with the recess 55.

Furthermore, in this embodiment, the through hole 50 is a portion of the rod 40 that is connected to the piston 60, and is formed so as to be in contact with the connecting surface 61a of the piston 60 with the rod 40. The recess may also be formed at a position away from the connecting portion of the rod with the piston. Even in this case, the orifice may be extended in the axial direction of the piston and communicated with the through hole or recess.

In addition, the orifice 70 has a tapered hole shape at the base 71 and a constant diameter hole shape at the distal end 73. It may be formed only with a tapered hole whose diameter gradually decreases from the beginning toward one end, or it may be formed into an elliptical shape, a rectangular shape, a slit shape, etc. instead of a circular hole shape.

Furthermore, in this embodiment, when the piston 60 moves in a direction away from the end wall 25 of the cylinder 20 (when the piston 60 moves in the damper braking direction F1), the control is performed by reducing the pressure in the first air chamber R1. When power is applied and the piston 60 moves in a direction approaching the end wall 25 of the cylinder 20 (when the piston 60 moves in the damper return direction F2), the braking force is released. There is. However, on the contrary, when the piston 60 moves in the direction approaching the end wall 25 of the cylinder 20, the damper braking force acts, and the piston 60 moves in the direction away from the end wall 25 of the cylinder 20. The damper braking force may be released when the vehicle moves.

Furthermore, in this embodiment, one member is used as a fixed body such as an instrument panel accommodating part, and the other member is used as an opening/closing body such as a glove box or a lid, but the pair of members can be moved close to and separated from each other. There is no particular limitation as long as it is.

Furthermore, in this embodiment, an air chamber (first air chamber R1) is formed in the cylinder 20 on the side in the insertion direction of the piston rod 30 relative to the seal portion. An air chamber may be provided on the side in the insertion direction, and another sealed air chamber may be provided in the cylinder on the side opposite to the direction in which the piston rod is inserted. Note that the "air chamber" in the present invention only means the air chamber on the piston rod insertion direction side. In this case, an exhaust hole is formed in the end wall of the cylinder, and a seal cap that allows the exhaust hole to be opened and closed is attached to the periphery of the exhaust hole. Furthermore, the guide cap attached to the opening at one end of the cylinder has a structure that can seal the periphery of the opening, and also seal the gap between the rod insertion opening and the rod inserted into the rod insertion opening. As a structure, another sealed air chamber is provided inside the cylinder on the side opposite to the direction in which the piston rod is inserted. Note that one end of the orifice communicates with the through hole or recess and communicates with the air chamber on the opposite side of the piston rod insertion direction through the through hole or recess, and the other end communicates with the air chamber on the opposite side of the piston rod insertion direction. It communicates with the air chamber. Then, when the piston moves away from the end wall of the cylinder (when it moves in the opposite direction to the direction in which the piston rod is inserted), the air chamber is pressurized, so that damper braking force is exerted. It has become. Note that when the piston moves close to the end wall of the cylinder (moves in the piston rod insertion direction), the seal cap opens the exhaust hole, the air in the air chamber is exhausted, and the damper braking force is increased. It will be canceled.

(effect)
Next, the effects of the damper device 10 having the above configuration will be explained.

In this damper device 10, the piston 60 is stationary within the cylinder 20 when one member (such as the fixed body) and the other member (such as the opening/closing body) are close to each other.

From the above state, when one member moves in a direction away from the other member (when the opening/closing body opens from the fixed body), the piston 60 moves within the cylinder 20 in the damper braking direction F1, and The rod 40 is pulled out from the opening 23 side of the cylinder 20. Then, the pressure in the first air chamber R1 in the cylinder 20 is reduced, so that a damper braking force is applied to the piston 60. As a result, one member can be moved slowly relative to the other member (the opening/closing body can be slowly opened from the fixed body).

Further, as described above, when the piston 60 moves in the damper braking direction F1, the air in the second air chamber R2 passes through the through hole 50 and the recess 55 as shown by the arrow V in FIG. After flowing into the orifice 70 from one end of the tip 73 having a constant diameter hole and flowing through the orifice 70, it flows from the other end of the base 71 having a tapered hole shape to the space on the other end side of the piston 60. K and flows out into the first air chamber R1. In this way, the damper braking force can be adjusted by the flow resistance when air flows through the orifice 70.

Furthermore, when one member is moved in a direction closer to the other member (when closing the opening/closing body with respect to the fixed body), the piston 60 moves within the cylinder 20 in the damper return direction F2, and The rod 40 is pushed into the cylinder 20.

Then, a predetermined portion of the seal ring 68 in the circumferential direction is deformed so as to fit into the notch 65 formed in the piston 60. As a result, the opening 66b of the concave groove 66 opens, and the air in the first air chamber R1 in the cylinder 20 passes through the annular groove 64 and the concave groove 66, and enters the through hole 50 from the opening 66a of the concave groove 66. The air flows out and is placed in the second air chamber R2. As a result, the damper braking force acting on the piston 60 is released, allowing the piston 60 to return to its initial position.

In this damper device 10, as shown in FIG. 8, the piston 60 is provided in a range that overlaps the through hole 50 or the recess 55 when the rod 40 is viewed from the axial direction, and one end is An orifice 70 is formed which communicates with the through hole 50 or the recess 55 and whose other end communicates with the air chamber (first air chamber R1) (see FIG. 10).

Therefore, the size of the piston 60 can be reduced while ensuring sufficient rigidity of the rod 40 without changing the thickness of the rod 40. That is, since the orifice 70 overlaps the through hole 50 or the recess 55 provided in the rod 40, there is no need to separately provide a part for forming the orifice, and the thickness of the rod 40 can be used to form the through hole 50 or the orifice 70. can be provided. As a result, the damper device 10 can be made smaller.

Further, in this embodiment, as shown in FIGS. 4 and 8, the cylinder 20 has a cylindrical wall portion 21, and a cross section of the wall portion 21 perpendicular to the moving direction of the piston 60. has a shape with a long axis A and a short axis B, and the piston 60 has a shape with a long axis A and a short axis B so as to fit the inner periphery of the wall 21 of the cylinder 20, The rod 40 has a plate shape with a long cross section in the direction of the long axis A of the piston 60 when the piston 60 is viewed from the axial direction.

According to the above aspect, the shape of the short axis B side of the piston 60 that matches the wall portion 21 of the cylinder 20 allows the piston 60 to be made more compact in the short axis B direction of the cylinder 20.

Further, since the orifice 70 is provided in a range overlapping with the through hole 50 or the recess 55 of the plate-shaped rod 40, the orifice 70 can be located inside the piston 60, and the long axis A of the cylinder 20 In this direction, the piston 60 can be made more compact.

As described above, the piston 60 can be made compact in the short axis B direction and the long axis A direction, and the wall 21 of the cylinder 20 also has a shape having the long axis A and the short axis B. As a result, the cylinder 20 can be made more compact in the long axis A and short axis B directions, making it easier to make the entire damper device 10 more compact.

Further, since the rod 40 is plate-shaped, it is easy to ensure a large cross-sectional area of the rod 40 with respect to the piston 60 having the shape of the long axis A and the short axis B as described above. The rigidity of the material can be increased.

Furthermore, in this embodiment, the orifice 70 is formed in the rod 40 at a position aligned with the axis C1 of the rod 40 (see FIG. 8).

According to the above aspect, since the orifice 70 is formed at a position aligned with the axis C1 of the rod 40, the air flowing through the orifice 70 flows into the first air chamber R1 in a well-balanced manner during damper braking. , it is possible to prevent foreign matter such as dust from accumulating unevenly around the periphery of one end of the orifice 70.

Further, when the through hole 50 is formed in the rod 40 and the orifice 70 is formed at a position aligned with the axis C1 of the rod 40 as described above, the rod 40 is formed in the width direction (long axis A). direction), the through holes 50 can be easily arranged in a well-balanced manner, and the balance of rigidity of the portion of the rod 40 where the through holes 50 are provided (here, the other end portion 43) can be improved. Furthermore, if the rod 40 is formed with the through hole 50, when the piston 60 moves in the damper return direction F2, even if foreign matter is accumulated in the through hole 50, the through hole 50 is removed from the first air chamber R1. The air flowing through can make it easier to expel foreign matter.

Furthermore, in this embodiment, as shown in FIGS. 3 and 10, the through hole 50 or the recess 55 is formed so as to be in contact with the connecting surface 61a of the piston 60 with the rod 40.

According to the above aspect, the through hole 50 or the recess 55 is formed so as to be in contact with the connecting surface 61a of the piston 60 with the rod 40, so that the length (axial length) of the orifice 70 is shortened. This makes it easy to adjust the damper braking force (if the orifice is long, it is difficult to adjust the damper braking force).

Also, since the length of the orifice 70 can be shortened, it becomes easier to mold the orifice 70 (if the length of the orifice is long, it is necessary to lengthen the thin pin for molding the orifice, but such a thin pin (Because it breaks easily, it has poor formability).

(Other embodiments of damper device)
11 to 13 show other embodiments of the damper device according to the invention. Note that substantially the same parts as those in the embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

In the damper device 10A of this embodiment, a protrusion 75 is formed on the surface of the through hole 50 or the recess 55 on the piston 60 side, and one end of the orifice 70 passes through the protrusion 75 to form the through hole 50 or a recess 55 .

As shown in FIGS. 11 and 12, in this embodiment, the surface 52 of the through hole 50 on the piston 60 side is directed from a position aligned with the axis C2 of the piston 60 toward one end side of the piston 60. A protrusion 75 is provided in a protruding manner. Moreover, this protrusion 75 has a shape in which the top of a cone is cut with a flat surface. That is, the protrusion 75 has a skirt (the other end) that widens to form a substantially circular shape, and the diameter gradually decreases from the skirt to the top (one end), and the top is approximately round. It has a flat surface shape.

Further, as shown in FIG. 13, the orifice 70 has a tip 73 having a constant diameter located within the protrusion 75, and one end of the tip 73 passing through the top (one end) of the protrusion 75. It communicates with the through hole 50.

According to this aspect, a protrusion 75 is formed on the surface 52 of the through hole 50 on the piston 60 side, and one end of the orifice 70 is formed to pass through the protrusion 75 and communicate with the through hole 50. Therefore, it is possible to prevent foreign matter such as dust from accumulating on the periphery of one end of the orifice 70, thereby making it difficult for the orifice 70 to become clogged. As a result, stable damper braking force can be obtained.

Furthermore, the present invention is not limited to the embodiments described above, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included within the scope of the present invention. .

10,10A Damper device 20 Cylinder 30 Piston rod 40 Rod 50 Through hole 55 Recess 60 Piston 64 Annular groove 68 Seal ring (sealing part)
70 Orifice 75 Projection 80 Guide cap R1 First air chamber (air chamber)

Claims

A damper device that is installed between a pair of members that move closer to each other and applies a braking force when the pair of members move closer to each other or move away from each other,
a cylinder with an opening at one end;
a piston rod movably inserted into the cylinder through the opening;
The piston rod has a rod extending with a predetermined length, and a piston connected to the rod and provided with a seal portion on the outer periphery,
An air chamber is formed in the cylinder on the side in which the piston rod is inserted through the seal portion,
The rod has a through hole penetrating in a direction intersecting the moving direction of the piston, or a recess formed to be recessed at a predetermined depth in a direction intersecting the moving direction of the piston. It is provided,
The piston is provided in a range that overlaps the through hole or the recess when the rod is viewed from the axial direction, and one end communicates with the through hole or the recess, and the other end communicates with the air chamber. A damper device characterized in that an orifice communicating with the damper device is formed.
The cylinder has a cylindrical wall, and a cross section of the wall perpendicular to the direction of movement of the piston has a long axis and a short axis,
The piston has a shape having a long axis and a short axis to fit the inner periphery of the wall of the cylinder,
2. The damper device according to claim 1, wherein the rod has a plate shape having a long cross section in the longitudinal direction of the piston when the piston is viewed from the axial direction.
The damper device according to claim 1 or 2, wherein the orifice is formed at a position aligned with the axis of the rod.
A protrusion is formed on a surface of the through hole or the recess on the piston side,
The damper device according to any one of claims 1 to 3, wherein one end of the orifice passes through the protrusion and communicates with the through hole or the recess.
The damper device according to any one of claims 1 to 4, wherein the through hole or the recess is formed so as to be in contact with a connecting surface of the piston with the rod.