WO2018190256A1

WO2018190256A1 - Damper

Info

Publication number: WO2018190256A1
Application number: PCT/JP2018/014680
Authority: WO
Inventors: 加藤　幸一
Original assignee: 株式会社パイオラックス
Priority date: 2017-04-12
Filing date: 2018-04-06
Publication date: 2018-10-18
Also published as: JP6795688B2; JPWO2018190256A1

Abstract

Provided is a damper in which, with a rod drawn out to a maximum limit from a cap inlet/outlet, the tilt of the rod can be regulated and decreases in sealing properties can be prevented. This damper 10 has a cylinder 20, a piston 30 having a head 31 and a rod 32, and a cap 50 provided with an inlet/outlet 53, the head 31 being provided with a pair of first protrusions 40, 40, and the cap 50 being provided with a pair of second protrusions 60, 60. The damper is configured such that, with the rod 32 drawn out to a maximum limit from the inlet/outlet 53 as seen from an axial direction of a shaft linking part, tips 65 of the second protrusions 60 come into contact with the head 31, opposing side surfaces of the first protrusions 40 and the second protrusions 60 are able to come into contact with each other, and the tilt of the rod 32 is regulated.

Description

Damper

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

For example, in a glove box of an automobile, a damper may be used in order to prevent the lid from opening suddenly and open it gently.

As a conventional damper of this type, for example, in Patent Document 1 below, a piston including a rod and a housing that houses the piston are used to generate a braking force by the operation of the piston. A seal member for the inner wall of the housing and a slider that is slidable with respect to the piston and that contacts the inner wall of the housing with a predetermined frictional force. When the braking force is generated, the slider presses against the seal member. A damper is described in which a portion of the seal member that contacts the inner wall of the housing is deformed toward the outside of the housing.

Also, the housing has a thin box shape, and a cap is attached to the open end. As shown in FIG. 11 of Patent Document 1, the cap has a peripheral wall that fits the open end of the housing, and a frame-shaped opening for inserting a rod is formed in the inner central portion thereof. Furthermore, both the outer side surfaces of the opening and the inner peripheral surface of the peripheral wall are respectively connected by thin plates. In the state where the rod is pulled out from the opening of the cap to the maximum extent, the piston is prevented from coming off by the tip end surface of the piston coming into contact with the base end surface of the peripheral wall of the cap or the thin plate.

International Publication WO2015 / 093548

In the case of the damper of Patent Document 1 described above, when the fully open position of the lid is restricted with the rod pulled out from the opening of the cap to the maximum, the front end surface of the piston is the base end surface of the peripheral wall of the cap or the thin plate However, when an external force is further applied in this state, the rod may be tilted with respect to the axial center of the cylinder. In this case, the sealing performance between the seal member mounted on the outer periphery of the piston and the inner periphery of the housing is deteriorated, and a predetermined braking force may not be obtained.

Therefore, an object of the present invention is to provide a damper capable of restricting the inclination of the rod and preventing the deterioration of the sealing performance in a state in which the rod is pulled out from the insertion / extraction opening of the cap to the maximum extent.

In order to achieve the above object, the present invention is a 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 cylindrical shape with one end forming an opening. A cylinder, a piston that is slidably disposed in the cylinder, has a head and a rod extending from the head, and an insertion port that is attached to the opening of the cylinder and allows the rod to be inserted. A shaft coupling portion is provided on the outer periphery of the cylinder and on the distal end side of the rod, the shaft coupling portion for pivotally coupling to a corresponding portion of the pair of members. The shaft centers are arranged in parallel to each other, and when viewed from the shaft center direction of the shaft coupling portion, the head is provided with a pair of first convex portions with the rod interposed therebetween, and the cap In between the insertion and exit The pair of second convex portions are provided, and the pair of first convex portions are on the outer diameter side of the cylinder with respect to the pair of second convex portions when viewed from the axial center direction of the shaft coupling portion. Alternatively, the tip of the first convex part comes into contact with the cap or the tip of the second convex part is the head, with the rod being pulled out from the insertion port to the maximum while being arranged on the inner diameter side. The side surfaces of the first convex portion and the second convex portion facing each other can be brought into contact with each other, and the inclination of the rod is restricted.

According to the present invention, as viewed from the axial direction of the shaft connecting portion, the pair of first convex portions are disposed on the outer diameter side or inner diameter side of the cylinder with respect to the pair of second convex portions, and the rod is The tip of the first convex part comes into contact with the cap or the tip of the second convex part comes into contact with the head while being pulled out from the insertion port to the maximum, and the first convex part and the second convex part are opposed to each other. Since the side surfaces to be brought into contact with each other can be contacted and the inclination of the rod can be restricted, it is possible to prevent a decrease in the sealing performance between the outer periphery of the head and the inner periphery of the cylinder.

It is a disassembled perspective view which shows one Embodiment of the damper which concerns on this invention. It is a perspective view of the damper. It is a principal part expansion perspective view of the damper. It is sectional drawing at the time of seeing the cross section orthogonal to the axial direction of a rod of the cylinder which comprises the damper from the rod axial direction. The operation state of the 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 an explanatory view of the state where the piston is moved a predetermined distance from the end wall of the cylinder (C) is explanatory drawing of the state which the piston left | separated to the maximum from the end wall of a cylinder. (A) is the principal part expansion explanatory drawing in the state in which the piston left | separated from the end wall of the cylinder to the maximum in the damper, (b) is the sectional drawing. It is sectional drawing in the EE arrow line of Fig.6 (a). It is explanatory drawing which shows the state which attached the damper to a pair of member. The other embodiment of the damper which concerns on this invention is shown, and it is the principal part expansion perspective view. FIG. 4 is an enlarged perspective view of a main part when a part of the damper is broken. FIG. 3 is an enlarged cross-sectional view of the damper in a state where the piston is farthest from the end wall of the cylinder.

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

As shown in FIG. 2, the 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. For example, the damper 10 is applied to an instrument panel of an automobile. It can be used for braking, such as a glove box or a lid attached to the opening of the housing portion provided in an openable and closable manner. The damper 10 in this embodiment is attached to a glove box 1 as shown in FIG. 8 and brakes its opening / closing operation, and a box-shaped storage portion 2 is formed on the instrument panel side. A glove box 1 is attached to the opening of the part 2 through a rotating shaft 3 so as to be opened and closed. That is, in this embodiment, 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. The body. However, the pair of members is not particularly limited as long as they can be moved close to and away from each other by an opening / closing operation or a swinging operation.

As shown in FIG. 1, the damper 10 according to this embodiment includes a cylinder 20 having a wall portion 21 extending in a cylindrical shape, a slidably disposed in the cylinder 20, and extends from the head 31 and the head 31. A piston 30 having a rod 32; a seal ring 33 mounted on a head portion 31 of the piston 30; a valve body 39 housed in a valve body housing portion 36 formed on the piston 30; The cap 50 attached to the main body 22 is mainly configured.

As shown in FIG. 1 and FIG. 5, the cylinder 20 has a wall portion 21 extending in a cylindrical shape with a predetermined length, an opening 22 is provided at one end thereof, and a cap 50 is attached. In addition, an end wall 23 is provided at the other end of the wall portion 21, and the other end side of the cylinder 20 is closed. However, a through hole may be provided at a predetermined location on the end wall 23 and closed with a cap separate from the cylinder 20.

Further, as shown in FIG. 4, the wall portion 21 of the cylinder 20 has a cross section orthogonal to the axial direction (direction along the axial center C1 (see FIG. 1)), in other words, orthogonal to the axial direction of the rod 32. When the section to be viewed is viewed from the rod axis direction, it has a long axis A and a short axis B, and has an annular cross-sectional shape extending long in one direction. It has a pair of long

axis wall parts

26 and 26 arranged opposite to each other and a pair of short

axis wall parts

27 and 27 arranged opposite to each other with the short axis B as a boundary. . 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. A pair of

short axis walls

26, 26 and a pair of short axes arranged on the short axis B side, connecting both ends of the pair of

long axis walls

26, 26, and having a bent shape in an arc shape. It has

shaft wall portions

27 and 27. 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 FIG. 1, a shaft coupling portion 25 having a shaft hole 25a projects from an outer surface of one short shaft wall portion 27 and close to the end wall 23. A shaft portion (not shown) provided on one member (here, a fixed body such as a housing portion of an instrument panel) of the pair of members is inserted into the shaft hole 25a of the shaft connecting portion 25, and one member is inserted. On the other hand, the cylinder 20 is rotatably connected (see FIG. 5).

Further, as shown in FIG. 3, locking

holes

28, 28 each having a long hole shape are formed at both ends of the long axis A on the opening 22 side of each long axis wall portion 26. In total, four locking holes 28 are provided.

As shown in FIG. 1 and FIG. 2, in this embodiment, the head 31 constituting the piston 30 has a shape extending long in one direction so as to conform to the cross-sectional shape of the cylinder 20, and its outer periphery. A ring mounting groove 31a is formed in the ring. An annular seal ring 33 made of an elastic material such as rubber or elastic elastomer is mounted in the ring mounting groove 31a, and the seal ring 33 is in sliding contact with the inner peripheral surface of the wall portion 21 of the cylinder 20. 5B, the first chamber R1 is formed on the end wall 23 side of the cylinder 20 and the second chamber R2 is formed on the opening 22 side with the seal ring 33 as a boundary. It has become.

On the other hand, in this embodiment, the rod 32 constituting the piston 30 extends from the longitudinal center of the piston 30 with a cross-sectional shape extending in one direction corresponding to the wall portion 21 of the cylinder 20. A shaft connecting portion 35 having a shaft hole 35a is provided at the tip portion. Of the pair of members, a shaft portion (not shown) provided on the other member (here, a glove box, a lid, etc.) is inserted into the shaft hole 35a of the shaft coupling portion 35, and the piston is moved against the other member. 30 rods 32 are rotatably connected (see FIG. 5).

In addition, as shown in FIG. 8, the direction orthogonal to the attachment surface (the side surface of the accommodating part 2 or the side surface of the glove box 1) in the pair of members (here, the accommodating part 2 and the glove box 1). When viewed from above, the shaft center C2 of the shaft connecting portion 35 and the shaft center C2 of the shaft connecting portion 25 provided in the cylinder 20 are arranged in parallel to each other, and these shaft centers C2 are fixed. It arrange | positions so that it may become parallel also with the rotating shaft 3 (refer FIG. 8) of the opening-and-closing member (glove box 1) with respect to a member (accommodating part 2).

Further, a valve body accommodating portion 36 having a circular concave shape is formed on one side surface along the longitudinal direction on the axial base end side of the rod 32. As shown in FIG. 1, a communication passage 37 for communicating the first chamber R <b> 1 and the second chamber R <b> 2 is formed on the bottom surface of the valve body housing portion 36. Furthermore, a valve body 39 that opens and closes the opening of the communication passage 37 is accommodated in the valve body accommodating portion 36. The valve body 39 normally closes the opening of the communication passage 37.

Then, from the state where the communication passage 37 is closed by the valve body 39, the piston 30 is moved in the braking direction (the head 31 of the piston 30 is separated from the end wall 23 of the cylinder 20 as shown by the arrow in FIG. 5B). When sliding in the direction), the inside of the first chamber R1 is depressurized, so that a braking force is applied to the piston 30. On the other hand, when the piston 30 slides in the direction opposite to the braking direction (the direction in which the head portion 31 of the piston 30 is close to the end wall 23), the communication passage 37 is opened, and the air in the first chamber R1 is communicated. The braking force applied to the piston 30 is released by passing through 37 and exhausting to the second chamber R2 side.

In this 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 away from the cylinder, the braking force is applied. You may make it cancel. Further, the damper in this embodiment is a so-called air damper that obtains a braking force by reducing the pressure in the space in the cylinder, but it may be a damper by the elastic force of rubber, a damper by hydraulic pressure, etc., such as a cylinder, piston, If it is a damper provided with a cap etc. and having the requirements of the present invention, there is no particular limitation.

Further, as shown in FIGS. 5 and 6, when viewed from the axial center direction of the

shaft coupling portions

25 and 35, the head portion 31 is provided with a pair of first

convex portions

40 and 40 with a rod 32 interposed therebetween. It has been. In this embodiment, the first convex portions 40 project from both ends in the longitudinal direction of the head portion 31 of the piston 30 and from the surfaces facing the opening 22 side of the cylinder 20. Each first convex portion 40 has a long plate-like first protruding piece 41 arranged along the long axis direction of the head portion 31, and a short axis direction of the head portion 31 at the central portion of the first protruding piece 41. Is formed in a substantially cross shape (see FIG. 2).

In addition, as said 1st convex part, for example, cylindrical shape, prismatic shape, elliptical column shape, one long plate shape, etc. may be comprised. The first convex portion is composed of a pair of wall portions, and the cap 32 is pulled out from the insertion / extraction port 53 of the cap 50 to the maximum when the rod 32 of the piston 30 is seen from the axial direction of the

shaft coupling portions

25 and 35. You may comprise so that the 2nd convex part (opposite convex part) provided in the side may be located between a pair of wall part of a 1st convex part. Further, in the case where the first convex portion is composed of a pair of wall portions disposed to face each other, the pair of wall portions are coupled to each other by a pair of coupling walls disposed in a direction orthogonal to the facing direction. The cylindrical portion may be configured, and the second convex portion (the convex portion on the other side) provided on the cap side in the state where the rod 32 of the piston 30 is pulled out from the insertion / extraction opening 53 of the cap 50 to the maximum. You may comprise so that it may be accommodated in a shape part. Thus, the shape and structure of the first convex portion are not particularly limited.

Next, the cap 50 attached to the opening 22 of the cylinder 20 will be described.

1 and 2, the cap 50 of this embodiment has a cover wall 51 that covers the opening 22 of the cylinder 20. In addition, the cover wall 51 has a shape having a long axis A and a short axis B that match the wall portion 21 of the cylinder 20, and an insertion port 53 through which the rod 32 is inserted is formed. The insertion / extraction opening 53 is formed in a long hole shape at the center of the cover wall 51 in the long axis direction.

As shown in FIGS. 3, 5, and 6, when viewed from the axial direction of the

shaft coupling portions

25, 35, the cap 50 has a pair of second convex portions 60 with the insertion / extraction opening 53 therebetween. , 60 are provided.

In this embodiment, both end portions of the cover wall 51 in the long axis direction, that is, locations where the insertion / extraction opening 53 is sandwiched, and from the back side, the second convex portions 60 having a cylindrical shape are respectively provided. Projected. In addition, the back surface of the cover wall 51 means the surface which faces a cylinder inward in the state which attached the cap 50 to the opening part 22 of the cylinder 20, as shown in FIG.

As shown in FIG. 3, the second convex portion 60 in this embodiment includes a pair of

wall portions

61 and 62 arranged to face each other, and the pair of

wall portions

61 and 62 are orthogonal to the facing direction. They are connected to each other by a pair of connecting

walls

63, 63 arranged in a direction to form a cylindrical portion. More specifically, the second convex portion 60 includes a pair of

wall portions

61 and 62 arranged to face each other so as to be parallel to each other at a predetermined interval along the minor axis direction of the cover wall 51. The both end portions of the

wall portions

61 and 62 are disposed so as to face each other in a direction orthogonal to the facing direction of the pair of wall portions 61 and 62 (that is, facing each other along the long axis direction of the cover wall 51). Are connected to each other by a pair of connecting

walls

63, 63, thereby forming a substantially square cylindrical portion. The wall portion 61 is disposed on the outer diameter side of the cylinder 20, and the wall portion 62 is disposed on the inner diameter side of the cylinder 20 relative to the wall portion 61.

In addition, on the inner side of the second convex portion 60 having a cylindrical portion, the rod 32 of the piston 30 is pulled out from the insertion / extraction port 53 of the cap 50 to the maximum extent (see FIG. 5C), and FIG. As shown to b), the 1st convex part 40 (opposite convex part) provided in the head part 31 of piston 30 is inserted and accommodated, and the 1st convex part 40 is further in that state. However, it is comprised so that it may be located between a pair of

wall parts

61 and 62. FIG.

Further, each connecting wall 63 is formed with a locking piece 67 which can be bent through a slit 67a having a substantially U-shape. As shown in FIG. 7, each locking piece 67 is locked to each locking hole 28 of the cylinder 20, so that the cap 50 is attached to the opening 22 of the cylinder 20 (FIG. 2). reference). The locking piece 67 may be formed not on the connecting wall 63 but on one or both of the pair of

wall portions

61 and 62. In FIG. 7, the rod 32 is omitted for convenience.

Then, as shown in FIG. 5C, the head 31 of the piston 30 slides farthest from the end wall 23 of the cylinder 20, and the rod 32 of the piston 30 is pulled out from the insertion port 53 to the maximum extent. In this state, as shown in FIG. 7, the first convex portion 40 is inserted and accommodated inside the cylindrical second convex portion 60. At this time, the distal end 65 of the second convex portion 60 (here, the distal ends of the

wall portions

61 and 62 and the connecting walls 63 and 63) abuts on the peripheral edge portion of the first convex portion 40 of the head portion 31 (FIG. 6 ( b)), further pulling out of the rod 32 is restricted, and the second protruding piece 43 of the first convex portion 40 is disposed inside the locking

pieces

67, 67 of the second convex portion 60. Then, the bending of the locking

pieces

67 and 67 to the inside of the second convex portion 60 is restricted, and the locking of the locking pieces 67 with respect to the locking holes 28 is prevented from being released, and the cap 50 from the opening portion 22 is prevented. It is designed to prevent falling out of Even when the locking piece 67 is formed on the pair of

wall portions

61, 62, the rod 32 is pulled out from the insertion / extraction opening 53 to the maximum, and the first convex portion 40 becomes the cylindrical portion (second convex portion). 60) It is comprised so that the inward bending | flexion of the latching piece 67 may be controlled in the state accommodated in.

Furthermore, in this damper 10, a pair of 1st

convex parts

40 and 40 provided in the head 31 and a pair of 2nd

convex parts

60 and 60 provided in the cap 50 are comprised by the following relationships. ing.

That is, as shown in FIG. 5 and FIG. 6, the pair of first

convex portions

40, 40 are cylinders more than the pair of second

convex portions

60, 60 when viewed from the axial direction of the

shaft coupling portions

25, 35. 20 is the outer diameter side or the inner diameter side of the piston 20, and is the tip 45 of the first convex portion 40 in contact with the cap 50 in a state where the rod 32 of the piston 30 is pulled out from the insertion port 53 of the cap 50 to the maximum extent? Alternatively, the tip 65 of the second convex portion 60 abuts against the head portion 31 of the piston 30, and the opposing side surfaces of the first convex portion 40 and the second convex portion 60 can abut, and the rod 32 of the piston 30. It is comprised so that the inclination of may be regulated.

Further, the inclination of the rod 32 of the piston 30 refers to the

shaft coupling portions

25 and 35 when the rod 32 is not inclined but is drawn straight along the axis C1 of the cylinder 20 as shown in FIG. This means that the angle θ is smaller or larger than the angle θ of the rod 32 with respect to the line segment L connecting the axes C2 and C2.

Furthermore, in this embodiment, as shown in FIG. 6B, when viewed from the axial direction of the

shaft coupling portions

25, 35, the pair of first

convex portions

40, 40 is a pair of second convex portions 60. , 60 are arranged closer to the inner diameter side of the cylinder 20 than the

wall portions

61, 61, and are arranged closer to the outer diameter side of the cylinder 20 than the

wall parts

62, 62 of the pair of second

convex portions

60, 60. Yes. Then, as shown in FIG. 5C, the tip 65 of the second convex portion 60 contacts the head portion 31 of the piston 30 with the rod 32 of the piston 30 pulled out from the insertion / extraction port 53 of the cap 50 to the maximum extent. Both the

outer side surfaces

41a and 41a of the 1st protrusion piece 41 of the 1st convex part 40, and the inner side surfaces 61a and 62a of the

wall parts

61 and 62 of the 2nd convex part 60 which are arrange | positioned and oppose each other (See the imaginary line in FIG. 6B), and is configured to regulate the inclination of the rod 32 of the piston 30.

The second convex portion may be a cylindrical shape, an elliptical cylindrical shape, a simple pin-shaped protrusion, or the like, without being a rectangular tube shape. Depending on the structure, it can be provided.

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

That is, in the damper 10, as shown in FIG. 6B, the pair of first

convex portions

40, 40 is a pair of second convex portions 60 when viewed from the axial direction of the

shaft coupling portions

25, 35. , 60 are arranged closer to the inner diameter side of the cylinder 20 than the

wall portions

wall parts

62, 62 of the pair of second

convex portions

60, 60. Yes. Therefore, as shown in FIG. 5C, the tip 65 of the second convex portion 60 contacts the head 31 of the piston 30 with the rod 32 of the piston 30 pulled out from the insertion / extraction port 53 of the cap 50 to the maximum extent. Both the

outer side surfaces

wall parts

61 and 62 of the 2nd convex part 60 which are arrange | positioned and oppose each other Can be contacted.

Therefore, in a state where the rod 32 of the piston 30 is pulled out from the insertion / extraction port 53 of the cap 50 to the maximum extent, for example, when the glove box 1 is detached, the fully open stopper between the glove box 1 and the housing portion 2 is released, When the glove box 1 is held in a state of being opened more than in normal use, the rod 32 is inclined with respect to the line segment L connecting the

shaft coupling portions

25 and 35 so as to be smaller or larger than the angle θ. 6B, the first projecting piece of the first projecting portion 40 is arranged such that the tip 65 of the second projecting portion 60 abuts against the head portion 31 of the piston 30 and is opposed thereto. One outer side surface 41a of 41 and the inner side surface 61a of the wall part 61 of the 2nd convex part 60 contact | abut (refer the imaginary line of the rod 32 lower side in FIG.6 (b)). Alternatively, the other outer surface 41a of the first projecting piece 41 of the first projecting portion 40, the tip 65 of the second projecting portion 60 abutting against the head portion 31 of the piston 30 and disposed opposite thereto, and The inner surface 62a of the wall part 62 of the 2nd convex part 60 contact | abuts (refer the imaginary line of the rod 32 upper side in FIG.6 (b)). As a result, the inclination of the rod 32 of the piston 30 can be restricted, and the sealing performance between the outer periphery of the seal ring 33 attached to the head portion 31 of the piston 30 and the inner periphery of the cylinder 20 is prevented from being deteriorated. The predetermined braking force can be applied to the piston 30.

In this embodiment, the second convex portion 60 provided on the cap 50 side is composed of a pair of

wall portions

61 and 62, and viewed from the axial direction of the

shaft coupling portions

25 and 35, the rod 32 of the piston 30. Is configured to be positioned between the pair of

wall portions

61 and 62 in a state where the first protrusion 40 is pulled out from the insertion port 53 of the cap 50 to the maximum (see FIG. 6B). ). Therefore, when the rod 32 is about to tilt with the rod 32 pulled out from the insertion / extraction port 53 to the maximum extent, as shown in FIG. 6B, the inner side surfaces 61a and 62a of the pair of

wall portions

61 and 62, respectively. Thus, the inclination of the rod 32 can be more effectively regulated by holding the outer surface of the counterpart first convex portion 40 (here, the outer surface 41a of the first protruding piece 41). In addition, the same effect can be obtained also when the 1st convex part provided in the head side consists of a pair of wall part.

Further, in this embodiment, the second convex portion 60 provided on the cap 50 side is disposed such that the pair of wall portions 61 and 52 face each other, and the pair of

wall portions

61 and 62 face each other. The cylinders are connected to each other by a pair of

connection walls

63 and 63 arranged in a direction orthogonal to the direction (see FIG. 3), and the rod 32 of the piston 30 is maximum from the insertion / extraction port 53 of the cap 50. It is configured that the counterpart first convex portion 40 is accommodated in the cylindrical portion of the second convex portion 60 in the state of being pulled out (see FIG. 6B). Therefore, in any state where the rod 32 is pulled out from the insertion / extraction port 53 to the maximum extent, the tilt can be suppressed in all directions. In addition, the same effect can be obtained also when the 1st convex part provided in the head side has comprised the cylindrical shape which receives the other party's 2nd convex part.

Moreover, in this embodiment, the 2nd convex part 60 consists of a pair of

wall parts

61 and 62, and this pair of

wall parts

61 and 62 are mutually connected by a pair of

connection walls

63 and 63, and a cylindrical part is made. In addition, a locking piece 67 for locking to the cylinder 20 is formed on the connecting wall 63 so as to be able to bend, and the rod 32 of the piston 30 is pulled out from the insertion / extraction port 53 of the cap 50 to the maximum. In a state where the convex portion 40 is accommodated in the cylindrical portion of the second convex portion 60, the inward bending of the locking piece 67 is restricted (see FIG. 7). Therefore, in the state where the rod 32 is pulled out from the insertion / extraction port 53 to the maximum extent, the inclination of the rod 32 can be suppressed in all directions, and the bending of the locking piece 67 is restricted, and the opening of the cylinder 20 is restricted. It is possible to reliably prevent the cap 50 from coming off. In addition, the same effect can be acquired also when the locking piece 67 is formed in the connection wall 63 side.

Further, as shown in FIG. 3, locking

holes

28 and 28 are respectively formed at both ends of the long axis A side of the long axis wall portion 26 of the cylinder 20 on the opening 22 side. A plurality of locking holes 28 are provided, and four locking pieces 67 provided on the second convex portion 60 of the cap 50 are respectively locked to the locking holes 28. Thus, the cap 50 is prevented from coming off from the opening 22 of the cylinder 20 on both sides of both ends of the long axis side of the cylinder 20 (the retaining structure is provided at the four outermost positions of the cylinder 20). Provided), the rod 32 of the piston 30 is pulled out from the insertion / extraction opening 53 of the cap 50 to the maximum, and the rod 32 is in a state where the head 31 is in contact with the tip 65 of the second convex portion 60 of the cap 50. When trying to incline, the fulcrum at which the rod 32 inclines (inner peripheral portion P1 of the insertion / extraction port 53 of the cap 50: see FIG. 6B) and the point of action where the load from the head 31 acts (second convex portion) The length of the portion P2 where the head portion 31 abuts against the tip 65 of 60 (see FIG. 6B) can be secured long, and the rod 32 can be made difficult to tilt.

9 to 11 show other embodiments of the 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.

The damper 10A of this embodiment is different from the previous embodiment in the structure of the first convex portion 40A provided on the head portion 31 of the piston 30 and the second convex portion 60A provided on the cap 50.

As shown in FIG. 9 and FIG. 10, first convex portions 40 </ b> A project from both ends of the head portion 31 in the longitudinal direction and face the opening portion 22 side of the cylinder 20. Specifically, the first convex portion 40A extends from both longitudinal edges of the head 31 with a predetermined width along the axial direction of the head 31 and has a predetermined length along the axial direction of the rod 32. It has a wide plate shape protruding at. Further, as shown in FIG. 10, ribs 46 having ridges are provided along the axial direction of the rod 32 on both the front and back surfaces of the first convex portion 40 </ b> A and near the axial center of the rod 32. ing.

On the other hand, the 2nd convex part 60A provided in the cap 50 consists of a pair of

wall parts

61 and 62 similarly to the 2nd convex part 60 of the said embodiment, and these were connected by the

connection walls

63 and 63, and the substantially square shape. Although it has a cylindrical shape, as shown in FIG. 9, a slit 61 b is formed along the axial direction of the rod 32 in the wall portion 61 disposed on the cylinder outer diameter side. Therefore, in a state where the rod 32 of the piston 30 is pulled out from the insertion / extraction port 53 of the cap 50 to the maximum extent, the side portion on the cylinder outer diameter side of the first convex portion 40A is inserted and the outer side surface 44 is exposed. (See FIG. 9).

In the damper 10A of the embodiment having the above-described configuration, the pair of first

convex portions

40A and 40A provided on the head 31 and the pair of second

convex portions

60A and 60A provided on the cap 50 are as follows. Consists of relationships.

That is, as shown in FIG. 11, when viewed from the axial direction of the

shaft coupling portions

25 and 35, the pair of first

convex portions

40A and 40A is the wall of the pair of second

convex portions

60A and 60A on the cylinder inner diameter side. The tip 45 of the first convex portion 40 is in contact with the cap 50 in a state where the rod 32 of the piston 30 is pulled out from the insertion / extraction port 53 of the cap 50 to the maximum while being disposed on the outer diameter of the cylinder 20 rather than the portion 62. The two

outer surfaces

44, 44 of the first convex portion 40A and the inner side surface 62a of the wall portion 62 of the second convex portion 60A, which are in contact with each other and are opposed to each other, can be brought into contact with each other (see FIG. 11), the inclination of the rod 32 of the piston 30 is restricted. Therefore, the inclination of the rod 32 of the piston 30 can be restricted, and the sealing performance between the outer periphery of the seal ring 33 attached to the head portion 31 of the piston 30 and the inner periphery of the cylinder 20 can be prevented. And a predetermined braking force can be applied to the piston 30.

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 Damper 20 Cylinder 21 Wall 22 Opening 23 End Wall 28 Locking Hole 30 Piston 31 Head 32 Rod 33 Seal Ring 39

Valve

40, 40A First Convex 45 Tip 50 Cap 53

Insertion Port

60, 60A Second convex portion 65 tip

Claims

A 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 cylindrical cylinder having an opening at one end, a piston slidably disposed in the cylinder, and having a head and a rod extending from the head, and an opening of the cylinder, and the rod is inserted. And a cap provided with an insertion / exit opening that can be taken out,
On the outer periphery of the cylinder and on the tip end side of the rod, there are provided shaft connecting portions for rotatably connecting to corresponding portions of the pair of members, and the shaft connecting portions are arranged in parallel to each other. And
As seen from the axial direction of the shaft connecting portion, the head is provided with a pair of first convex portions with the rod in between, and the cap has the insertion port in between, A pair of second convex portions is provided;
The pair of first convex portions are disposed on the outer diameter side or the inner diameter side of the cylinder with respect to the pair of second convex portions when viewed from the axial direction of the shaft coupling portion, and the rod is inserted into the insertion portion. The tip of the first convex part comes into contact with the cap or the tip of the second convex part comes into contact with the head, and the first convex part and the first The damper is characterized in that the opposing side surfaces of the two convex portions can be brought into contact with each other, and the inclination of the rod is restricted.
Either one of the first convex portion or the second convex portion is composed of a pair of wall portions, and the rod is pulled out from the insertion port to the maximum when viewed from the axial direction of the shaft connecting portion. The damper according to claim 1, wherein the opposing convex portion is located between the pair of wall portions.
The pair of wall portions are arranged to face each other, and the pair of wall portions are connected to each other by a pair of connecting walls arranged in a direction orthogonal to the facing direction to constitute a cylindrical portion. The damper according to claim 2, wherein the convex part of the other party is accommodated in the cylindrical part in a state where the rod is pulled out from the insertion / exit opening to the maximum extent.
The second convex portion includes a pair of wall portions, and the pair of wall portions are connected to each other by the pair of connecting walls to form a cylindrical portion, and the cylinder is attached to the wall portion or the connecting wall. The locking piece to be locked to is formed to be able to bend,
The rod is configured to be regulated from inward bending of the locking piece in a state in which the rod is pulled out from the insertion port to the maximum and the first convex portion is accommodated in the cylindrical portion. Item 4. The damper according to item 3.