Opening and closing damper

Abstract

To provide a damper for an opening / closing body in which an elastic body can absorb an impact of closing of the opening / closing body for an extended period, and the elastic body can absorb a vibration transmitted between a vehicle body and the opening / closing boy during idling or traveling of a vehicle.SOLUTION: A damper 1 for the opening / closing body comprises: a first base 11 and a first elastic body 13. The first base 11 includes a first attachment part 15 and a holding part 19. An insertion hole 22 is formed in the first elastic body 13. The insertion hole 22 includes a first inside face 22a, a second inside face 22b, a third inside face 22c, and a fourth inside face 22d, sequentially in a counterclockwise manner as seen from one side of a second direction D2. The holding part 19 includes a first outside face 19a, a second outside face 19b, a third outside face 19c, and a fourth outside face 19d, sequentially in a counterclockwise manner as seen from one side of the second direction D2. The first inside face 22a, the third inside face 22c, the first outside face 19a, and the third outside face 19c have a length in a first direction D1 that is longer than the length in the first direction D1 of the first attachment part 15.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a damper for an opening / closing body.

Background Art

[0002] FIG. 16 shows a conventional damper 80 for an opening / closing body disclosed in Patent Document 1. In this document, a vehicle 89 has a vehicle body 81. An opening 810 is provided in the vehicle body 81, and an opening / closing body 82 capable of opening and closing the opening 810 is attached thereto. The damper 80 for the opening / closing body is used between the vehicle body 81 and the opening / closing body 82. The vehicle body 81 has a fixed surface 81a, and the opening / closing body 82 has a contact surface 82a.

[0003] The damper 80 for the opening / closing body is composed of a base 83 and an elastic body 84. The base 83 is composed of a mounting portion 83a and a holding portion 83b. The base is formed of a plate material having a certain plate thickness, and the mounting portion 83a and the holding portion 83b are integrally formed by bending the plate material. Therefore, the mounting portion 83a and the holding portion 83b have a plate shape with the same plate thickness. The mounting portion 83a has a fixed surface 830 to be fixed to the fixed surface 81a. The holding portion 83b is disposed inside the elastic body 84 and holds the elastic body 84.

[0004] The elastic body 84 is made of synthetic rubber or the like. An insertion hole 84a into which the holding portion 83b is inserted is formed in the elastic body 84. The insertion hole 84a has a quadrangular prism shape. The insertion hole 84a extends in a first direction perpendicular to the fixed surface 81a, a second direction orthogonal to the first direction, and a third direction orthogonal to the first and second directions. Specifically, the first direction is the front-rear direction of the vehicle body 81, the second direction is the up-down direction of the vehicle body 81, that is, the depth direction of the paper surface of FIG. 16, and the third direction is the left-right direction of the vehicle body 81.

[0005] Further, the insertion hole 84a has, in one direction of the second direction, that is, when viewed from the front side of the paper surface of FIG. 16, a first inner surface 841, a second inner surface 842, a third inner surface 843, and a fourth inner surface 844 in a counterclockwise order. The first inner surface 841 extends in the first direction and the second direction while being orthogonal to the fixed surface 81a. The second inner surface 842 is continuous with the first inner surface 841 and extends in the second direction and the third direction while being orthogonal to the first inner surface 841. The third inner surface 843 is continuous with the second inner surface 842 and extends in the first direction and the second direction while being orthogonal to the second inner surface 842. The fourth inner surface 844 is continuous with the first inner surface 841 and the third inner surface 843 and extends in the second direction and the third direction while being orthogonal to the first inner surface 841 and the third inner surface 843.

[0006] On the other hand, the holding portion 83b also has, when viewed from one direction of the second direction, a first outer surface 831, a second outer surface 832, a third outer surface 833, and a fourth outer surface 834 in a counterclockwise order. The first outer surface 831 extends in the first direction and the second direction so as to face and contact the first inner surface 841. The second outer surface 832 is continuous with the first outer surface 831 and extends in the second direction and the third direction so as to face and contact the second inner surface 842. The third outer surface 833 is continuous with the second outer surface 832 and extends in the first direction and the second direction so as to face and contact the third inner surface 843. The fourth outer surface 834 is continuous with the first outer surface 831 and the third outer surface 833 and extends in the second direction and the third direction so as to face and contact the fourth inner surface 844. Here, since the plate thicknesses of the mounting portion 83a and the holding portion 83b are equal, the first outer surface 831 and the third outer surface 833 have the same length in the first direction as the length of the mounting portion 83a in the first direction. Also, the first inner surface 841 and the third inner surface 843 have the same length in the first direction as the length of the mounting portion 83a in the first direction.

[0007] In this damper 80 for the opening / closing body, the base 83 and the elastic body 84 are assembled by inserting the holding portion 83b into the insertion hole 84a from one side in the second direction. At this time, the first inner surface 841 and the first outer surface 831 are in contact with each other while facing each other, the second inner surface 842 and the second outer surface 832 are in contact with each other while facing each other, the third inner surface 843 and the third outer surface 833 are in contact with each other while facing each other, and the fourth inner surface 844 and the fourth outer surface 834 are in contact with each other while facing each other. Further, by fixing the fixed surface 830 to the fixed surface 81a, the base 83 is fixed to the fixed surface 81a. In this way, the damper 80 for the opening / closing body is fixed to the vehicle body 81. And in this damper 80 for the opening / closing body, when the opening / closing body 82 is closed, the contact surface 82a comes into contact with the elastic body 84, so that the elastic body 84 absorbs the impact at the time of closing of the opening / closing body 82 and reduces the sound at that time. Further, the elastic body 84 also absorbs the vibration transmitted between the vehicle body 81 and the opening / closing body 82 during idling or running of the vehicle 89.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] By the way, in this type of damper for the opening / closing body, when the fixed surface and the contact surface are not parallel due to the design of the vehicle body or the opening / closing body, a force acts to rotate the elastic body while shifting it in the third direction with respect to the elastic body by the contact surface that contacts the elastic body when the opening / closing body is closed. Further, even if the fixed surface and the contact surface are designed to be parallel, a force acts to rotate the elastic body while shifting it in the third direction with respect to the elastic body when the opening / closing body is closed due to manufacturing errors or assembly errors of the vehicle body and the opening / closing body.

[0010] In this regard, in the conventional damper for an opening / closing body, since the lengths in the first direction of the first inner surface, the third inner surface, the first outer surface, and the third outer surface are equal to the length in the first direction of the holding portion, the elastic body cannot withstand the above-described force, and deformation in which the elastic body is displaced with respect to the holding portion is likely to occur. For this reason, the durability of the elastic body is a concern.

[0011] The present invention has been made in view of the above-described conventional circumstances, and an object to be solved is to provide a damper for an opening / closing body that can absorb an impact when the opening / closing body is closed by an elastic body over a long period of time, and can also absorb vibrations transmitted between the vehicle body and the opening / closing body during idling or running of the vehicle.

Means for Solving the Problems

[0012] The damper for an opening / closing body of the present invention is a damper for an opening / closing body used between a vehicle body provided with an opening and an opening / closing body attached to the vehicle body so as to be able to open and close the opening, One member, which is one of the vehicle body and the opening / closing body, has a fixed surface, The other member, which is the other of the vehicle body and the opening / closing body, has a contact surface, a base fixed to the fixed surface, and an elastic body made of an elastic material, held by the base, and capable of contacting the contact surface when the opening / closing body is closed. The base has a plate-shaped attachment portion having a fixed surface to be fixed to the fixed surface, and a holding portion that is integral with the attachment portion and is disposed inside the elastic body to hold the elastic body. The elastic body extends in a first direction perpendicular to the fixed surface, a second direction orthogonal to the first direction, and a third direction orthogonal to the first direction and the second direction, and an insertion hole into which the holding portion is inserted is formed from one side in the second direction. The insertion hole has a first inner surface, a second inner surface, a third inner surface, and a fourth inner surface in a counterclockwise order when viewed from one side in the second direction. The first inner surface extends in the first direction and the second direction while intersecting the fixed surface, the second inner surface extends in the second direction and the third direction while being continuous with and intersecting the first inner surface, the third inner surface extends in the first direction and the second direction while being continuous with and intersecting the second inner surface, and the fourth inner surface extends in the second direction and the third direction while being continuous with and intersecting the first inner surface and the third inner surface. When viewed from one side in the second direction, the holding portion has a first outer surface, a second outer surface, a third outer surface, and a fourth outer surface in a counterclockwise order. The first outer surface extends in the first direction and the second direction so as to face and abut the first inner surface, the second outer surface extends in the second direction and the third direction while being continuous with the first outer surface so as to face and abut the second inner surface, the third outer surface extends in the first direction and the second direction while being continuous with the second outer surface so as to face and abut the third inner surface, and the fourth outer surface extends in the second direction and the third direction while being continuous with the first outer surface and the third outer surface so as to face and abut the fourth inner surface. The first inner surface, the third inner surface, the first outer surface, and the third outer surface are characterized in that the length in the first direction is longer than the length in the first direction of the mounting portion.

[0013] In the damper for an opening / closing body of the present invention, the insertion hole of the elastic body has first to fourth inner surfaces, and the holding portion of the base has first to fourth outer surfaces. Then, by inserting the holding portion into the insertion hole, the first inner surface and the first outer surface, the second inner surface and the second outer surface, the third inner surface and the third outer surface, and the fourth inner surface and the fourth outer surface face and abut each other. Here, the first inner surface, the third inner surface, the first outer surface, and the third outer surface are longer in the first direction than the length in the first direction of the mounting portion. Therefore, in this damper for an opening / closing body, without increasing the size of the entire base in the first direction, it is possible to suitably secure the contact area between the first inner surface and the first outer surface and the contact area between the third inner surface and the third outer surface. For this reason, the holding portion can suitably hold the elastic body.

[0014] As a result, in this damper for an opening / closing body, even if a force that attempts to rotate the elastic body while shifting it in the third direction acts on the elastic body due to the contact surface that comes into contact with the elastic body when the opening / closing body is closed, the elastic body can suitably resist that force. Therefore, it is difficult for the elastic body to be displaced with respect to the holding portion. For this reason, the durability of the elastic body can be increased.

[0015] Therefore, the damper for an opening / closing body of the present invention can absorb the impact when the opening / closing body is closed by the elastic body over a long period of time, and can also absorb the vibration transmitted between the vehicle body and the opening / closing body during idling or traveling of the vehicle by the elastic body.

[0016] The attachment portion preferably has a first attachment portion and a second attachment portion located on the opposite side of the first attachment portion with the holding portion interposed therebetween in the second direction. In this case, in the base, since the holding portion exists between the first attachment portion and the second attachment portion in the second direction, it is easy to hold the elastic body in the holding portion. Further, by fixing each fixed surface of the first attachment portion and the second attachment portion to the fixed surface, the base can be firmly fixed to the fixed surface.

[0017] The base can be made of resin or metal. And it is preferable that the holding portion has a plurality of first recesses recessed in the first direction from at least one of the second outer surface and the fourth outer surface, and ribs provided between the first recesses. In this case, while reducing the weight of the base, the strength of the holding portion can be increased by the ribs.

[0018] Also, the base can be made of metal or resin. And it is preferable that the holding portion has a second recess recessed in the first direction from one of the second outer surface and the fourth outer surface. Thereby, the weight of the base can be reduced. Further, when the base is made of a metal plate, the second recess can be formed simultaneously by forming the holding portion by drawing, and the strength of the holding portion can also be ensured.

[0019] The second recess may have a first end face extending in the first and third directions at one end in the second direction, and a second end face extending in the first and third directions at the other end in the second direction. And it is preferable that the elastic body has a convex portion protruding from the second inner surface or the fourth inner surface into the second recess and abutting against the first end face and the second end face.

[0020] In this case, when the first and second end faces come into contact with the convex portion, the frictional force between the first and second end faces and the convex portion makes it more difficult for the elastic body to rotate in the third direction. Also, since the contact between the first and second end faces and the convex portion enables positioning of the holding portion and the elastic body, the assembly of the base and the elastic body becomes easy.

[0021] It is preferable that the elastic body has a bottom portion that abuts against one member while being elastically deformed when the base is fixed to the fixing surface with the holding portion inserted into the insertion hole. In this case, since the frictional force between the bottom portion and the one member increases when the base is fixed to the fixing surface, it becomes more difficult for the elastic body to rotate in the third direction.

[0022] It is preferable that the elastic body has a plurality of buffer portions extending in the third direction while protruding toward the contact surface. In this case, each buffer portion can reduce the impact when the contact surface and the elastic body come into contact.

Advantages of the Invention

[0023] The damper for an opening / closing body of the present invention can absorb the impact when the elastic body closes the opening / closing body over a long period of time, and can also absorb the vibration transmitted between the vehicle body and the opening / closing body during idling or running of the vehicle.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Embodiments for Carrying Out the Invention

[0025] Hereinafter, Examples 1 to 4 embodying the present invention will be described with reference to the drawings.

[0026] (Example 1) As shown in FIGS. 1 and 2, the damper 1 for the opening / closing body of the first embodiment includes a first base 11 and a first elastic body 13. The first base 11 is an example of the "base" in the present invention, and the first elastic body 13 is an example of the "elastic body" in the present invention.

[0027] In FIGS. 1 to 4, 8 to 15, the first direction D1, the second direction D2, and the third direction D3 are indicated by solid arrows in the figures. The first direction D1, the second direction D2, and the third direction D3 are orthogonal to each other. Further, hereinafter, one side and the other side of the first direction D1 will be described as the D1A side and the D1B side, respectively, one side and the other side of the second direction D2 will be described as the D2A side and the D2B side, respectively, and one side and the other side of the third direction D3 will be described as the D3A side and the D3B side, respectively.

[0028] The first base 11 shown in FIGS. 1 and 2 is formed of a resin such as polyacetal, polyamide, polybutylene terephthalate, or polypropylene. The first base 11 is formed in a substantially plate shape. More specifically, the first base 11 is formed in a substantially rectangular plate shape in which the length in the second direction D2 is longer than the length in the third direction D3. The first base 11 includes a first attachment portion 15, a second attachment portion 17, and a holding portion 19.

[0029] The first attachment portion 15 is disposed on the D2A side of the first base 11. The second attachment portion 17 is disposed on the D2B side of the first base 11. As shown in FIG. 3, both the first attachment portion 15 and the second attachment portion 17 have a length in the first direction D1 of a first length L11. In other words, the first attachment portion 15 and the second attachment portion 17 are formed in a plate shape having a thickness of the first length L11.

[0030] The first attachment portion 15 has a first front surface 15a facing the D1B side and a first back surface 15b facing the D1A side. The second attachment portion 17 has a second front surface 17a facing the D1B side and a second back surface 17b facing the D1A side. The first back surface 15b and the second back surface 17b are examples of the "surface to be fixed" in the present invention.

[0031] The first inner surface 15b and the second inner surface 17b are located on the D1A side most in the first base 11. As shown in FIG. 2, a first concave portion 15c recessed toward the D1B side is formed in the first inner surface 15b, and a second concave portion 17c recessed toward the D1B side is formed in the second inner surface 17b. The first inner surface 15b and the second inner surface 17b are formed flat except for the first concave portion 15c and the second concave portion 17c. Note that the formation of the first concave portion 15c and the second concave portion 17c may be omitted.

[0032] Also, a first mounting hole 150 is formed at the center of the first mounting portion 15. On the other hand, a second mounting hole 170 is formed at the center of the second mounting portion 17. The first and second mounting holes 150 and 170 extend in a columnar shape in the first direction D1, and penetrate the first mounting portion 15 and the second mounting portion 17 in the first direction D1, respectively.

[0033] The holding portion 19 is disposed between the first mounting portion 15 and the second mounting portion 17 in the second direction D2 and is integrated with the first mounting portion 15 and the second mounting portion 17. As shown in FIGS. 2 to 4, the holding portion 19 is formed in a substantially rectangular box shape extending in the first direction D1, the second direction D2, and the third direction D3, and protrudes on the D1B side from the first mounting portion 15 and the second mounting portion 17 in the first base 11. Note that, in FIG. 4, hatching is removed for easy explanation. The same applies to FIGS. 12 to 15 described later.

[0034] The holding portion 19 includes a first outer surface 19a, a second outer surface 19b, a third outer surface 19c, and a fourth outer surface 19d shown in FIG. 4, a first connection surface 19e and a second connection surface 19f shown in FIG. 3, and a plurality of first concave portions 25 and a plurality of first ribs 27 shown in FIG. 2. Each first rib 27 is an example of the "rib" in the present invention. As shown in FIG. 4, in the holding portion 19, when viewed from the D2A side, the first outer surface 19a, the second outer surface 19b, the third outer surface 19c, and the fourth outer surface 19d are arranged in this order in a counterclockwise direction.

[0035] As shown in FIG. 2, the first outer surface 19a extends in the first direction D1 and the second direction D2. The first outer surface 19a includes a first outer planar portion 191 and a first outer curved portion 192. The first outer planar portion 191 constitutes the D1A side of the first outer surface 19a. As shown in FIG. 4, the first outer planar portion 191 extends in the first direction D1 substantially perpendicular to the fourth outer surface 19d. The first outer curved portion 192 constitutes the D2B side of the first outer surface 19a and is integral with the first outer planar portion 191. The first outer curved portion 192 curves toward the D3B side as it separates from the first outer planar portion 191 toward the D1B side.

[0036] On the first outer surface 19a, the first outer planar portion 191 extends in the first direction D1 with a length L21a, and the first outer curved portion 192 extends in the first direction D1 with a length L21b. This length L21b is shorter than the length L21a. And the length of the first outer surface 19a in the first direction D1 is a second length L21, which is the sum of the length L21a of the first outer planar portion 191 and the length L21b of the first outer curved portion 192. This second length L21 is longer than a first length L11, which is the length of the first attachment portion 15 and the second attachment portion 17 in the first direction D1.

[0037] The second outer surface 19b extends in the second direction D2 and the third direction D3. The second outer surface 19b is continuous with the first outer curved portion 192 on the D3A side.

[0038] The third outer surface 19c extends in the first direction D1 and the second direction D2. The third outer surface 19c includes a second outer planar portion 193 and a second outer curved portion 194. The third outer surface 19c has a shape symmetric to the first outer surface 19a in the third direction D3. For this reason, the second outer planar portion 193 and the second outer curved portion 194 have shapes symmetric to the first outer planar portion 191 and the first outer curved portion 192 respectively in the third direction D3. Thereby, the length of the third outer surface 19c in the first direction D1 is also the second length L21, similar to the first outer surface 19a, and is longer than the first length L11. Also, the second outer curved portion 194 is continuous with the D3B side of the second outer surface 19b.

[0039] Here, although the lengths of the first outer surface 19a and the third outer surface 19c in the first direction D1 are the second length L21, they do not extend in the first direction D1 up to the positions of the first back surface 15b and the second back surface 17b. Also, the length of the first outer surface 19a and the third outer surface 19c in the second direction D2 is longer than the second length L21. Note that the length of the first outer surface 19a and the third outer surface 19c in the second direction D2 can be designed as appropriate.

[0040] As shown in FIG. 2, the fourth outer surface 19d is parallel to the second outer surface 19b and extends in the second direction D2 and the third direction D3. Each first recess 25 and each first rib 27 are provided on the fourth outer surface 19d. Each first recess 25 is arranged side by side in the second direction D2. Also, each first recess 25 is recessed from the fourth outer surface 19d toward the D1B side. Each first recess 25 forms a substantially triangular shape when viewed from the D1A side. Further, the fourth outer surface 19d is divided by each first recess 25 into a first portion 195 located on the D3A side sandwiching each first recess 25 and a second portion 196 located on the D3B side. And the fourth outer surface 19d is such that the first portion 195 is continuous with the first outer plane portion 191, and the second portion 196 is continuous with the second outer plane portion 193. Thus, the fourth outer surface 19d is continuous with the first outer surface 19a and the third outer surface 19c.

[0041] Here, as described above, since the first outer surface 19a and the third outer surface 19c do not extend in the first direction D1 up to the positions of the first back surface 15b and the second back surface 17b, the fourth outer surface 19d is located on the D1B side of the first back surface 15b and the second back surface 17b. Thereby, a first holding surface 20a is formed between the fourth outer surface 19d and the first back surface 15b, and a second holding surface 20b is formed between the fourth outer surface 19d and the second back surface 17b.

[0042] Each first rib 27 is provided between each pair of first recesses 25. As shown in FIG. 4, each first rib 27 extends from the bottom 25a of each first recess 25 toward the D1A side. Here, each first rib 27 extends to the positions of the first portion 195 and the second portion 196, and the rib end face 270 of each first rib 27 is flush with the first portion 195 and the second portion 196, that is, the fourth outer surface 19d. Also, as shown in FIG. 2, each first rib 27 extends linearly in the third direction D3 while being inclined in the second direction D2, and is connected to the first portion 195 and the second portion 196.

[0043] As shown in FIG. 3, the first connection surface 19e is located between the first attachment portion 15 and the first to third outer surfaces 19a to 19c in the second direction D2, and extends in the first direction D1 and the third direction D3. The first connection surface 19e is continuous with the first surface 15a of the first attachment portion 15 on the D1A side. Then, the first connection surface 19e extends while inclining from the first surface 15a side toward the second outer surface 19b side, and is continuous with the second outer surface 19b on the D1B side. Also, the first connection surface 19e is continuous with the first outer surface 19a on the D3A side and is continuous with the third outer surface 19c on the D3B side.

[0044] The second connection surface 19f is located between the second attachment portion 17 and the first to third outer surfaces 19a to 19c in the second direction D2. The second connection surface 19f has a shape symmetric to that of the first connection surface 19e in the second direction D2. Thereby, the second connection surface 19f is continuous with the second surface 17a of the second attachment portion 17 on the D1A side and is continuous with the second outer surface 19b on the D1B side. Also, the second connection surface 19f is continuous with the first outer surface 19a on the D3A side and is continuous with the third outer surface 19c on the D3B side.

[0045] The first elastic body 13 shown in FIGS. 1 and 2 is formed of an elastic material and is elastically deformable. Here, examples of the elastic material include natural rubber, synthetic rubbers such as ethylene propylene diene rubber, acrylonitrile butadiene rubber, chloroprene rubber, styrene butadiene rubber, fluororubber, urethane rubber, and silicone rubber, and thermoplastic elastomers such as polyester elastomer and polyurethane elastomer. The first elastic body 13 is composed of a base portion 21 and a plurality of buffer portions 23.

[0046] As shown in FIG. 2, the base portion 21 extends in a first direction D1, a second direction D2, and a third direction D3. An insertion hole 22 is formed in the base portion 21. The insertion hole 22 has a substantially rectangular columnar shape extending in the first direction D1, the second direction D2, and the third direction D3, and penetrates the base portion 21 in the second direction D2. The insertion hole 22 is formed in a shape corresponding to the holding portion 19, and the holding portion 19 can be inserted therein. Further, the base portion 21 has a bottom wall 210. The bottom wall 210 is an example of the "bottom portion" in the present invention. The bottom wall 210 is located on the D1A side with respect to the insertion hole 22. The bottom wall 210 has a plate shape extending in the second direction D2 and the third direction D3, and covers the insertion hole 22 from the D1A side. Thereby, the base portion 21 has a substantially rectangular cylindrical shape. Here, the length of the bottom wall 210 in the second direction D2 is shorter than the length of the insertion hole 22 in the second direction D2. Further, the bottom wall 210 has a first wall surface 210a located on the D2A side and a second wall surface 210b located on the D2B side.

[0047] As shown in FIG. 4, the insertion hole 22 is composed of a first inner surface 22a, a second inner surface 22b, a third inner surface 22c, and a fourth inner surface 22d. In the insertion hole 22, when viewed from the D2A side, the first inner surface 22a, the second inner surface 22b, the third inner surface 22c, and the fourth inner surface 22d are arranged in this order in a counterclockwise direction.

[0048] The first inner surface 22a extends in the first direction D1 and the second direction D2. More specifically, the first inner surface 22a is composed of a first inner planar portion 221 and a first inner curved portion 222. The first inner planar portion 221 constitutes the D1A side of the first inner surface 22a. The first inner curved portion 222 constitutes the D1B side of the first inner surface 22a and is connected to the first inner planar portion 221. The first inner planar portion 221 has the same shape as the first outer planar portion 191. The first inner curved portion 222 has the same shape as the first outer curved portion 192. For these reasons, the length of the first inner surface 22a in the first direction D1 is the same as the length of the first outer surface 19a in the first direction D1, which is the second length L21.

[0049] The second inner surface 22b extends in the second direction D2 and the third direction D3, similar to the second outer surface 19b. The second inner surface 22b is continuous with the first inner curved portion 222 on the D3A side.

[0050] The third inner surface 22c extends in the first direction D1 and the second direction D2. The third inner surface 22c has a shape symmetric to that of the first inner surface 22a in the third direction D3. The third inner surface 22c is composed of a second inner planar portion 223 and a second inner curved portion 224. The second inner planar portion 223 constitutes the D1A side of the third inner surface 22c. The second inner curved portion 224 constitutes the D1B side of the third inner surface 22c. The second inner planar portion 223 has the same shape as the second outer planar portion 193. The second inner curved portion 224 has the same shape as the second outer curved portion 194. For these reasons, the length of the third inner surface 22c in the first direction D1 is also the second length L21. Also, the second inner curved portion 224 is continuous with the D3B side of the second inner surface 22b.

[0051] The fourth inner surface 22d is formed on the bottom wall 210. The fourth inner surface 22d is parallel to the second inner surface 22b and extends in the second direction D2 and the third direction D3. The fourth inner surface 22d is continuous with the first inner surface 22a on the D3A side and continuous with the third inner surface 22c on the D3B side.

[0052] As shown in FIGS. 1 and 2, each buffer portion 23 is integrally formed with the base portion 21. The buffer portions 23 are arranged at a predetermined interval in the second direction D2. Each buffer portion 23 protrudes from the base portion 21 toward the D1B side and extends in the third direction D3. Here, the length of each buffer portion 23 in the third direction D3 is equal to the length of the base portion 21 in the third direction D3. Note that the number and shape of each buffer portion 23 can be appropriately designed.

[0053] The damper 1 for the opening / closing body is configured by assembling the first base 11 and the first elastic body 13. When assembling the first base 11 and the first elastic body 13, as shown by the dashed-dotted arrow in FIG. 2, the first base 11 is inserted into the insertion hole 22 of the first elastic body 13 from the second direction D2. More specifically, in this embodiment, by inserting the first base 11 into the insertion hole 22 from the D2A side, the second attachment portion 17 and the holding portion 19 are sequentially inserted into the insertion hole 22.

[0054] Then, as shown in FIG. 3, with respect to the second attachment portion 17, it is made to escape from the insertion hole 22 to the D2B side, while with respect to the holding portion 19, it is positioned within the insertion hole 22. Thereby, as shown in FIG. 4, the first inner surface 22a and the first outer surface 19a are in contact with each other while facing each other in the third direction D3, the second inner surface 22b and the second outer surface 19b are in contact with each other while facing each other in the first direction D1, the third inner surface 22c and the third outer surface 19c are in contact with each other while facing each other in the third direction D3, and the fourth inner surface 22d and the fourth outer surface 19d are in contact with each other while facing each other in the first direction D1. That is, the first to fourth inner surfaces 22a to 22d and the first to fourth outer surfaces 19a to 19d are in surface contact.

[0055] More specifically, at the first inner surface 22a and the first outer surface 19a, the first inner flat portion 221 and the first outer flat portion 191 are in contact with each other, and the first inner curved portion 222 and the first outer curved portion 192 are in contact with each other. At the third inner surface 22c and the third outer surface 19c, the second inner flat portion 223 and the second outer flat portion 193 are in contact with each other, and the second inner curved portion 224 and the second outer curved portion 194 are in contact with each other. Further, with respect to the fourth inner surface 22d, the first portion 195 and the second portion 196 are in contact therewith, and the rib end surfaces 270 of the respective first ribs 27 are also in contact in the first direction D1.

[0056] Furthermore, at the bottom wall 210, the first wall surface 210a contacts the first holding surface 20a in the second direction D2, and the second wall surface 210b contacts the second holding surface 20b in the second direction D2. Thereby, the holding portion 19 and the first elastic body 13 are positioned.

[0057] In this way, when the first base 11 and the first elastic body 13 are assembled, in the damper 1 for the opening / closing body, the holding portion 19 is disposed in the insertion hole 22, and thus in the first elastic body 13, and holds the first elastic body 13 from the inside.

[0058] Also, when the first base 11 and the first elastic body 13 are assembled, as shown in FIG. 3, in the first elastic body 13, the bottom wall 210 protrudes to the D1A side from the first back surface 15b and the second back surface 17b of the first base 11. In this manner, at the bottom wall 210, when the first base 11 and the first elastic body 13 are assembled, the length in the first direction D1, that is, the thickness in the first direction D1, is defined so as to protrude to the D1A side from the first back surface 15b and the second back surface 17b.

[0059] As shown in FIGS. 5 to 7, the damper 1 for the opening / closing body is adopted in the vehicle 100. The vehicle 100 has a vehicle body 101 and a back door 103. The back door 103 is an example of the "opening / closing body" in the present invention. In this embodiment, the vehicle body 101 is regarded as the "one member" in the present invention, and the back door 103 is regarded as the "other member" in the present invention. In FIGS. 5 to 7, the front-rear direction, the vertical direction, and the left-right direction of the vehicle body 101 are defined by the solid arrows shown in the figures. These front-rear direction, vertical direction, and left-right direction are orthogonal to each other. In FIG. 5, for ease of explanation, the damper 1 for the opening / closing body is exaggeratedly illustrated, and the shapes of the damper 1 for the opening / closing body and the vehicle 100 are simplified and illustrated.

[0060] As shown in FIG. 5, an opening 105 that opens to the outside of the vehicle 100 is provided at the rear part of the vehicle body 101. The vehicle body 101 has a rear panel 112. As shown in FIG. 6, the rear panel 112 has a fixing surface 112a, a first bolt hole 112b, and a second bolt hole 112c. The fixing surface 112a constitutes the rear surface of the rear panel 112 and extends in the vertical direction and the left-right direction. The first and second bolt holes 112b and 112c open to the fixing surface 112a respectively. Note that the shape of the fixing surface 112a can be designed as appropriate.

[0061] The back door 103 is attached to the vehicle body 101 so as to be swingable around a swing axis X1. Thereby, the back door 103 can open and close the opening 105 by being displaced between the position shown by the solid line in FIG. 5 and the position shown by the virtual line in FIG. 5.

[0062] The back door 103 has a contact surface 103a. The contact surface 103a is located in front of the back door 103 and extends in the vertical direction and the left-right direction. The contact surface 103a faces the damper 1 for the opening / closing body and the fixing surface 112a from the rear when the back door 103 is closed. Note that the shape of the contact surface 103a can be designed as appropriate.

[0063] As shown in FIGS. 5 to 7, the damper 1 for the opening / closing body is used between the rear panel 112 and the back door 103 by being fixed to the fixed surface 112a. When fixing the damper 1 for the opening / closing body to the fixed surface 112a, the first direction D1 is made to correspond to the front-rear direction of the vehicle body 101, the second direction D2 is made to correspond to the up-down direction of the vehicle body 101, and the third direction D3 is made to correspond to the left-right direction of the vehicle body 101. Then, the damper 1 for the opening / closing body is arranged behind the rear panel 112. At this time, in the damper 1 for the opening / closing body, the first back surface 15b and the second back surface 17b are in a state facing the fixed surface 112a. That is, the fixed surface 112a is in a state located on the D1A side with respect to the first back surface 15b and the second back surface 17b.

[0064] Then, the first bolt 31 is inserted through the first mounting hole 150, and the second bolt 33 is inserted through the second mounting hole 170. Further, while inserting these first bolt 31 and second bolt 33 through the first bolt hole 112b and the second bolt hole 112c respectively, they are fastened by the first nut 35 and the second nut 37 provided on the rear panel 112.

[0065] Thereby, the first back surface 15b and the second back surface 17b are fixed to the fixed surface 112a. For this reason, the first inner surface 22a, the third inner surface 22c, the first outer surface 19a, and the third outer surface 19c are each substantially perpendicular to the fixed surface 112a and extend in the first direction D1, that is, the front-rear direction. More specifically, the first inner flat portion 221, the second inner flat portion 223, the first outer flat portion 191, and the second outer flat portion 193 each extend in the first direction D1 substantially perpendicular to the fixed surface 112a.

[0066] Further, the bottom wall 210 protrudes toward the D1A side from the first back surface 15b and the second back surface 17b. Therefore, when the first mounting portion 15 and the second mounting portion 17 are fixed to the fixing surface 112a, the bottom wall 210 is sandwiched between the fourth outer surface 19d and the rear panel 112 while being compressed in the first direction D1. Thus, in the damper 1 for the opening / closing body, the first base 11 is fixed to the fixing surface 112a and is fixed to the rear panel 112. In FIG. 5, only one damper 1 for the opening / closing body is shown, but in the vehicle 100, dampers 1 for the opening / closing body are respectively fixed to positions on the left and right sides of the opening 105 with respect to the rear panel 112. The number of dampers 1 for the opening / closing body fixed to the rear panel 112 can be appropriately designed according to the size of the opening 105, the size of the back door 103, etc.

[0067] When the back door 103 is closed, the first elastic body 13 of the damper 1 for the opening / closing body abuts against the contact surface 103a of the back door 103 in the first direction D1, that is, the front-rear direction. Thereby, in the damper 1 for the opening / closing body, when the first elastic body 13 elastically deforms, it absorbs the impact when the back door 103 is closed and reduces the sound at that time. Further, in the damper 1 for the opening / closing body, the first elastic body 13 also absorbs the vibration transmitted between the vehicle body 101 and the back door 103 during idling or running of the vehicle 100.

[0068] Here, in the damper 1 for the opening / closing body, as shown by the dashed arrow in FIG. 7, when the back door 103 is closed, a force (hereinafter referred to as the rotational force F1) that tries to rotate the first elastic body 13 while shifting it in the third direction D3, that is, the left-right direction, acts on the first elastic body 13 due to the contact surface 103a that contacts the first elastic body 13.

[0069] In this regard, in the damper 1 for the opening / closing body, when the holding portion 19 is inserted into the insertion hole 22, the first to fourth inner surfaces 22a to 22d and the first to fourth outer surfaces 19a to 19d face and contact each other. The first inner surface 22a, the third inner surface 22c, the first outer surface 19a, and the third outer surface 19c have a length in the first direction D1 of the second length L21, which is longer than the first length L11 that is the length in the first direction D1 of the first mounting portion 15 and the second mounting portion 17. Therefore, in this damper 1 for the opening / closing body, without increasing the size of the entire first base 11 in the first direction D1, it is possible to suitably secure the contact area between the first inner surface 22a and the first outer surface 19a and the contact area between the third inner surface 22c and the third outer surface 19c. For this reason, the holding portion 19 can suitably hold the first elastic body 13.

[0070] As a result, in this damper 1 for the opening / closing body, even when a rotational force F1 acts on the contact surface 103a that contacts the first elastic body 13 when the back door 103 is closed, the first elastic body 13 can suitably resist the rotational force F1. Therefore, it is difficult for the first elastic body 13 to be displaced and deformed with respect to the holding portion 19. For this reason, the durability of the first elastic body 13 is high.

[0071] Therefore, the damper 1 for the opening / closing body of the first embodiment can absorb the impact when the back door 103 is closed by the first elastic body 13 over a long period of time, and the first elastic body 13 can absorb the vibration transmitted between the vehicle body 101 and the back door 103 during idling or running of the vehicle 100.

[0072] In particular, in the damper 1 for the opening / closing body, since the holding portion 19 exists between the first mounting portion 15 and the second mounting portion 17, it is easy to hold the first elastic body 13 by the holding portion 19. Further, by fixing the first back surface 15b and the second back surface 17b to the fixing surface 112a, respectively, it is possible to firmly fix the first base 11 to the fixing surface 112a and thus to the rear panel 112.

[0073] Further, the first base 11 is made of resin. The holding portion 19 has a plurality of first recesses 25 and a plurality of first ribs 27. By these, while reducing the weight of the first base 11 including the holding portion 19, it is possible to increase the strength of the holding portion 19 by each first rib 27. Further, since the rib end face 270 of each first rib 27 abuts on the fourth inner face 22d, the first elastic body 13 is also difficult to rotate in the third direction D3 due to the frictional force between the rib end face 270 and the fourth inner face 22d.

[0074] Furthermore, the base portion 21 of the first elastic body 13 has a bottom wall 210, and the bottom wall 210 abuts on the fixed surface 112a while being elastically deformed by fixing the first attachment portion 15 and the second attachment portion 17 to the fixed surface 112a. That is, the bottom wall 210 is sandwiched in a compressed state in the first direction D1 between the fourth outer surface 19d and the rear panel 112. Thereby, since the frictional force between the bottom wall 210 and the rear panel 112 increases, also in this respect, the first elastic body 13 is difficult to rotate in the third direction D3.

[0075] Further, since the first elastic body 13 has a plurality of buffer portions 23, it is possible to reduce the impact when the contact surface 103a and the first elastic body 13 come into contact by each buffer portion 23.

[0076] (Embodiment 2) As shown in FIGS. 8 and 9, the damper 2 for the opening and closing body of the second embodiment includes a second base 41 and a second elastic body 43. The second base 41 is also an example of the "base" in the present invention, and the second elastic body 43 is also an example of the "elastic body" in the present invention.

[0077] The second base 41 is formed of a metal plate. Examples of the metal plate include a cold-rolled steel sheet and a hot-rolled steel sheet. The second base 41 is formed in a substantially rectangular shape having a longer length in the second direction D2 than the length in the third direction D3. The second base 41 has a first attachment portion 45, a second attachment portion 47, and a holding portion 49.

[0078] The first mounting portion 45 is disposed on the D2A side in the second base 41. The second mounting portion 47 is disposed on the D2B side in the second base 41. As shown in FIG. 10, in both the first mounting portion 45 and the second mounting portion 47, the length in the first direction D1 is the first length L12. This first length L12 corresponds to the thickness of the metal plate forming the second base 41. Here, the first length L12 is shorter than the first length L11 in the damper 1 for the opening / closing body of the first embodiment. That is, the first and second mounting portions 45 and 47 of the second base 41 are formed thinner than the first and second mounting portions 15 and 17 of the first base 11.

[0079] Further, the first mounting portion 45 has a first front surface 45a facing the D1B side and a first back surface 45b facing the D1A side. The second mounting portion 47 has a second front surface 47a facing the D1B side and a second back surface 47b facing the D1A side. The first and second back surfaces 45b and 47b are also examples of the "surface to be fixed" in the present invention. The first back surface 45b and the second back surface 47b are located on the most D1A side in the second base 41.

[0080] Also, a first mounting hole 450 is formed at the center of the first mounting portion 45. On the other hand, a second mounting hole 470 is formed at the center of the second mounting portion 47. The first and second mounting holes 450 and 470 extend in a columnar shape in the first direction D1 and penetrate the first mounting portion 45 and the second mounting portion 47 in the first direction D1, respectively.

[0081] The holding portion 49 is formed by performing a drawing process on the second base 41. As a result, the holding portion 49 is disposed between the first mounting portion 45 and the second mounting portion 47 in the second direction D2 while being integral with the first mounting portion 45 and the second mounting portion 47, that is, at the central portion in the second base 41. As shown in FIGS. 10 to 12, the holding portion 49 is formed in a substantially rectangular box shape extending in the first direction D1, the second direction D2, and the third direction D3, and protrudes to the D1B side from the first mounting portion 45 and the second mounting portion 47 in the second base 41.

[0082] The holding part 49 is composed of a first outer surface 49a, a second outer surface 49b, a third outer surface 49c, and a fourth outer surface 49d shown in FIG. 12, and a first connection surface 49e, a second connection surface 49f, and a second recess 61 shown in FIGS. 10 and 11. As shown in FIG. 12, in the holding part 49, when viewed from the D2A side, the first outer surface 49a, the second outer surface 49b, the third outer surface 49c, and the fourth outer surface 49d are arranged in this order in the counterclockwise direction.

[0083] As shown in FIG. 9, the first outer surface 49a extends in the first direction D1 and the second direction D2. The first outer surface 49a is composed of a third outer flat part 491 and a third outer curved part 492. The third outer flat part 491 has the same configuration as the first outer flat part 191 in the first embodiment and extends in the first direction D1 with a length L21a. Also, the third outer curved part 492 has the same configuration as the first outer curved part 192 in the first embodiment and extends in the first direction D1 with a length L21b. Thereby, the first outer surface 49a, like the first outer surface 19a in the first embodiment, has a length in the first direction D1 of the second length L21. This second length L21 is longer than the first length L12, which is the length in the first direction D1 in the first attachment part 45 and the second attachment part 47.

[0084] As shown in FIG. 12, the second outer surface 49b extends in the second direction D2 and the third direction D3. The second outer surface 49b is continuous with the third outer curved part 492 on the D3A side.

[0085] The third outer surface 49c extends in the first direction D1 and the second direction D2. The third outer surface 49c is composed of a fourth outer flat part 493 and a fourth outer curved part 494. The third outer surface 49c has a shape symmetrical to the first outer surface 49a in the third direction D3, and the fourth outer flat part 493 and the fourth outer curved part 494 each have the same configuration as the second outer flat part 193 and the second outer curved part 194 in the first embodiment. Thereby, the length of the third outer surface 49c in the first direction D1 is also the second length L21. Also, the fourth outer curved part 494 is continuous with the D3B side of the second outer surface 49b. Note that the length of the second direction D2 in the first outer surface 49a and the third outer surface 49c is the same as that of the first outer surface 19a and the third outer surface 19c in the first embodiment.

[0086] As shown in FIG. 9, the fourth outer surface 49d is parallel to the second outer surface 49b and extends in the second direction D2 and the third direction D3. A second recess 61 is provided in the fourth outer surface 49d. The second recess 61 is recessed in a substantially rectangular shape from the fourth outer surface 49d toward the D1B side. Due to this second recess 61, the holding portion 49 has an opening on the D1A side. And the fourth outer surface 49d is divided into a first portion 495 located on the D3A side with the second recess 61 interposed therebetween and a second portion 496 located on the D3B side.

[0087] Also, as shown in FIG. 10, the second recess 61 has a first end surface 61a and a second end surface 61b. The first end surface 61a is located on the D2A side in the second recess 61 and extends in the first direction D1 and the third direction D3. The second end surface 61b is located on the D2B side in the second recess 61 and extends in the first direction D1 and the third direction D3. The first end surface 61a extends substantially perpendicular to the first direction D1 from the first back surface 45b, and the second end surface 61b extends substantially perpendicular to the first direction D1 from the second back surface 47b.

[0088] The first connection surface 49e is located between the first attachment portion 45 and the first to third outer surfaces 49a to 49c in the second direction D2 and extends in the first direction D1 and the third direction D3. The first connection surface 49e is continuous with the first surface 45a of the first attachment portion 45 on the D1A side and extends substantially perpendicular to the first direction D1 from the first surface 45a. And the first connection surface 49e is continuous with the second outer surface 49b on the D1B side. Also, the first connection surface 49e is continuous with the first outer surface 49a on the D3A side and is continuous with the third outer surface 49c on the D3B side.

[0089] The second connection surface 49f is located between the second attachment part 47 and the first to third outer surfaces 49a to 49c in the second direction D2, and extends in the first direction D1 and the third direction D3. The second connection surface 49f is continuous with the second surface 47a of the second attachment part 47 on the D1A side and extends substantially perpendicular to the first direction D1 from the second surface 47a. And the second connection surface 49f is continuous with the second outer surface 49b on the D1B side. Also, the second connection surface 49f is continuous with the first outer surface 49a on the D3A side and continuous with the third outer surface 49c on the D3B side.

[0090] The second elastic body 43 shown in FIG. 9 has the same configuration as the first elastic body 13 except for having the first convex part 51. The first convex part 51 is an example of the "convex part" in the present invention. The first convex part 51 is integrally formed on the bottom wall 210 of the base part 21 and protrudes substantially rectangularly from the fourth inner surface 22d toward the first direction D1, that is, into the insertion hole 22. Here, the first convex part 51 is separated from the second inner surface 22b on the D1A side and is not in contact with the second inner surface 22b.

[0091] Also, as shown in FIG. 11, the first convex part 51 extends in the second direction D2. Thereby, the first convex part 51 has a substantially rectangular columnar shape. The first convex part 51 has an opposing surface 510 that opposes the second inner surface 22b in the first direction D1, a first convex part end surface 511 located on the D2A side, and a second convex part end surface 512 located on the D2B side. As shown in FIG. 9, the first convex part end surface 511 is continuous with the first wall surface 210a. Similarly, the second convex part end surface 512 is continuous with the second wall surface 210b. Note that a plurality of the first convex parts 51 may be formed on the bottom wall 210.

[0092] For this damper 2 for the opening / closing body as well, as shown by the dashed-dotted arrow in FIG. 9, the second base 41 is inserted into the insertion hole 22 of the second elastic body 43 from the D2A side. Then, as shown in FIG. 12, the holding portion 49 is positioned within the insertion hole 22. As a result, the first inner surface 22a and the first outer surface 49a face each other and come into contact in the third direction D3. Also, the second inner surface 22b and the second outer surface 49b face each other and come into contact in the first direction D1. Further, the third inner surface 22c and the third outer surface 49c face each other and come into contact in the third direction D3. And the fourth inner surface 22d and the fourth outer surface 49d face each other and come into contact in the first direction D1. At this time, on the fourth outer surface 49d, the first portion 495 and the second portion 496 come into contact with the fourth inner surface 22d respectively. Thus, also in the damper 2 for the opening / closing body, the first to fourth inner surfaces 22a to 22d and the first to fourth outer surfaces 49a to 49d are in surface contact.

[0093] By assembling the second base 41 and the second elastic body 43, the holding portion 49 is disposed within the insertion hole 22, and thus within the second elastic body 43, and holds the second elastic body 43 from the inside. Also, by the holding portion 49 being positioned within the insertion hole 22, in the second elastic body 43, the first convex portion 51 protrudes into the second concave portion 61 of the holding portion 49. And, as shown in FIG. 11, in the first convex portion 51, the first convex portion end face 511 comes into contact with the first end face 61a in the second direction D2, and the second convex portion end face 512 comes into contact with the second end face 61b in the second direction D2. Also, the bottom wall 210 protrudes to the D1A side more than the first back surface 45b and the second back surface 47b.

[0094] Similar to the damper 1 for the opening / closing body, for the damper 2 for the opening / closing body as well, when the first back surface 45b and the second back surface 47b are fixed to the fixed surface 112a, the second base 41 is fixed to the fixed surface 112a. Also, when the second base 41 is fixed to the fixed surface 112a, the bottom wall 210 is sandwiched between the fourth outer surface 49d and the rear panel 112 while being compressed in the first direction D1 between the fourth outer surface 49d and the rear panel 112.

[0095] Even in the damper 2 for the opening / closing body, the lengths of the first inner surface 22a, the third inner surface 22c, the first outer surface 49a, and the third outer surface 49c in the first direction D1 are the second length L21, which is longer than the first length L12 that is the length of the first attachment portion 45 and the second attachment portion 47 in the first direction D1. Thereby, the holding portion 49 can preferably hold the second elastic body 43.

[0096] Also, in the damper 2 for the opening / closing body, by forming the second base 41 of a metal plate, while making the lengths of the first attachment portion 45 and the second attachment portion 47 in the first direction D1 the first length L12, it is possible to preferably ensure the rigidity of the second base 41 including the first attachment portion 45 and the second attachment portion 47.

[0097] Furthermore, since the holding portion 49 has the second recess 61, it is possible to reduce the weight of the second base 41 while forming the second base 41 of a metal plate. Also, by forming the holding portion 49 by drawing, the second recess 61 can be formed simultaneously, and the strength of the holding portion 49 can be ensured.

[0098] Also, in the damper 2 for the opening / closing body, since the first and second convex portion end faces 511 and 512 respectively contact the first and second end faces 61a and 61b, the second elastic body 43 is difficult to rotate in the third direction D3 due to the frictional force between the first and second end faces 61a and 61b and the first and second convex portion end faces 511 and 512. Also, due to the contact between the first and second end faces 61a and 61b and the first and second convex portion end faces 511 and 512, the positioning between the holding portion 49 and the second elastic body 43 can be achieved, so that the assembly of the second base 41 and the second elastic body 43 becomes easy. Other operations in the damper 2 for the opening / closing body are the same as those of the damper 1 for the opening / closing body in the first embodiment.

[0099] (Embodiment 3) As shown in FIG. 13, the damper 3 for the opening / closing body of Embodiment 3 includes a third base 71 and a third elastic body 73. The third base 71 is also an example of the "base" in the present invention, and the third elastic body 73 is also an example of the "elastic body" in the present invention.

[0100] The third base 71 has the same configuration as the first base 11, except that the holding portion 19 has a plurality of second ribs 28. Each second rib 28 is also an example of the "rib" in the present invention. Each second rib 28 is provided between the first recesses 25, and extends from the bottom 25a of each first recess 25 toward the D1A side. Here, the length of each second rib 28 in the first direction D1 is shorter than the length of each first rib 27 in the first direction D1. As a result, the rib end face 280 of each second rib 28 is not flush with the fourth outer surface 19d, and is located on the D1B side of the fourth outer surface 19d. Other configurations of each second rib 28 are the same as those of each first rib 27.

[0101] The third elastic body 73 has the same configuration as the first elastic body 13, except that it has a second convex portion 53. The second convex portion 53 is integrally formed on the bottom wall 210 of the base portion 21, and protrudes substantially rectangularly from the fourth inner surface 22d toward the first direction D1, that is, into the insertion hole 22. The second convex portion 53 has an opposing surface 530 that opposes the second inner surface 22b in the first direction D1. Here, the length of the second convex portion 53 in the first direction D1 is shorter than the length of the first convex portion 51 in the first direction D1. Other configurations of the second convex portion 53 are the same as those of the first convex portion 51. Note that the length of the second convex portion 53 in the first direction D1 can be designed as appropriate.

[0102] Even in the damper 3 for the opening / closing body, similar to the damper 1 for the opening / closing body, a third base 71 and a third elastic body 73 are assembled. Thus, in the damper 3 for the opening / closing body, in addition to the first to fourth inner surfaces 22a to 22d and the first to fourth outer surfaces 19a to 19d coming into contact, the rib end surfaces 280 of the respective second ribs 28 and the opposing surfaces 530 of the second convex portions 53 come into contact while opposing each other in the first direction D1. Also, although not shown in the drawings, the first wall surface 210a and the second wall surface 210b of the bottom wall 210 come into contact with the first holding surface 20a and the second holding surface 20b of the third base 71 in the second direction D2, respectively. Further, with respect to the end surface on the D2A side in the first recess 25 located on the most D2A side among the respective first recesses 25 and the end surface on the D2B side in the first recess 25 located on the most D2B side among the respective first recesses 25, the second convex portion 53 comes into contact therewith in the second direction, respectively. Thus, in the damper 3 for the opening / closing body, due to the frictional force between the rib end surface 280 and the opposing surface 530, and the frictional force between the above-described both end surfaces and the second convex portion 53, it becomes difficult for the third elastic body 73 to rotate in the third direction D3. Other operations in the damper 3 for the opening / closing body are the same as those in the damper 1 for the opening / closing body.

[0103] (Example 4) As shown in FIG. 14, the damper 4 for the opening / closing body of Example 4 includes a first base 11 and a fourth elastic body 93. The fourth elastic body 93 is also an example of the "elastic body" in the present invention.

[0104] The fourth elastic body 93 has the same configuration as the first elastic body 13, except that the base portion 21 has a bottom wall 211, a first protruding portion 95, and a second protruding portion 97. The first protruding portion 95 and the second protruding portion 97 are examples of the "bottom portion" in the present invention.

[0105] The bottom wall 211 has a plate shape extending in the second direction D2 and the third direction D3, similar to the bottom wall 210 in Example 1. Here, when the first base 11 and the fourth elastic body 93 are assembled, the thickness in the first direction D1 is defined so that the first back surface 15b and the second back surface 17b are substantially flush. For this reason, the bottom wall 211 is formed thinner in the first direction D1 than the bottom wall 210. Other configurations of the bottom wall 211 are the same as those of the bottom wall 210.

[0106] As shown in FIG. 15, the first protruding portion 95 and the second protruding portion 97 are integrally formed on the bottom wall 211, respectively. The first protruding portion 95 is disposed on the D3A side of the bottom wall 211, and the second protruding portion 97 is disposed on the D3B side of the bottom wall 211. The first protruding portion 95 and the second protruding portion 97 are symmetric in the third direction. And the first protruding portion 95 and the second protruding portion 97 protrude from the bottom wall 211 toward the D1A side. Thereby, the first protruding portion 95 and the second protruding portion 97 are located on the most D1A side in the fourth elastic body 93. And when the first base 11 and the fourth elastic body 93 are assembled, the first protruding portion 95 and the second protruding portion 97 protrude more toward the D1A side than the first back surface 15b and the second back surface 17b.

[0107] Also, the first protruding portion 95 extends in the third direction D3 from the end on the D3A side of the bottom wall 211 toward the second protruding portion 97, and extends in the second direction D2 with the same length as the bottom wall 211. On the other hand, the second protruding portion 97 extends in the third direction D3 from the end on the D3B side of the bottom wall 211 toward the first protruding portion 95, and extends in the second direction D2 with the same length as the bottom wall 211. Thus, the first protruding portion 95 and the second protruding portion 97 form a substantially rectangular plate shape protruding from the bottom wall 211 toward the D1A side.

[0108] More specifically, the first protruding portion 95 is composed of a first main body portion 95a and a first extending portion 95b. The first main body portion 95a is located on the D3A side of the first inner surface 22a. The first extending portion 95b is located on the D3B side of the first main body portion 95a and is continuous with the first main body portion 95a. The first extending portion 95b has an inclined surface 951 connected to the bottom wall 211. On the other hand, the second protruding portion 97 is composed of a second main body portion 97a and a second extending portion 97b. The second main body portion 97a is located on the D3B side of the third inner surface 22c. The second extending portion 97b is located on the D3A side of the second main body portion 97a and is continuous with the second main body portion 97a. The second extending portion 97b has an inclined surface 971 connected to the bottom wall 211. Note that the formation of the inclined surface 951 and the inclined surface 971 may be omitted.

[0109] When the first base 11 and the fourth elastic body 93 are assembled, in the first protrusion 95, the first main body portion 95a is located on the D3A side with respect to the first outer surface 19a. On the other hand, the first extending portion 95b is located on the D1A side with respect to the first portion 195 of the fourth outer surface 19d and overlaps the first portion 195 in the first direction D1. Further, in the second protrusion 97, the second main body portion 97a is located on the D3B side with respect to the third outer surface 19c. On the other hand, the second extending portion 97b is located on the D1A side with respect to the second portion 196 of the fourth outer surface 19d and overlaps the second portion 196 in the first direction D1.

[0110] In the damper 4 for the opening / closing body, when the first base 11 is fixed to the fixing surface 112a, the first protrusion 95 and the second protrusion 97 come into contact with the rear panel 112 while being elastically deformed. Therefore, in the damper 4 for the opening / closing body, the frictional force between the first protrusion 95 and the second protrusion 97 and the rear panel 112 is large. In particular, in the first protrusion 95, the first extending portion 95b is sandwiched between the first portion 195 and the rear panel 112, and in the second protrusion 97, the second extending portion 97b is sandwiched between the second portion 196 and the rear panel 112. Therefore, the frictional force between the first extending portion 95b and the second extending portion 97b and the rear panel 112 is even larger. As a result, in the damper 4 for the opening / closing body, it is difficult for the fourth elastic body 93 to rotate in the third direction D3. Other operations of the damper 4 for the opening / closing body are the same as those of the damper 1 for the opening / closing body.

[0111] As described above, the present invention has been described with reference to Examples 1 to 4. However, the present invention is not limited to the above Examples 1 to 4, and it goes without saying that the present invention can be appropriately modified and applied without departing from the gist thereof.

[0112] For example, the vehicle body 101 may be the "other member" in the present invention, and the back door 103 may be the "one member" in the present invention.

[0113] Further, the back door 103 provided with a damper contact member capable of contacting the dampers 1 to 4 for the opening / closing body may be the "opening / closing body" in the present invention.

[0114] Also, the first and third bases 11 and 71 may be made of metal, and the second base 41 may be made of resin. When making the first and third bases 11 and 71 of metal, for example, die-casting a zinc alloy or the like can be mentioned.

[0115] Also, in the first and third bases 11 and 71, the formation of the second attachment portion 17 may be omitted. Similarly, in the second base 41, the formation of the second attachment portion 47 may be omitted.

[0116] Also, in the first and third bases 11 and 71, the first recess 25 may be provided on the second outer surface 19b, or may be provided on both the second outer surface 19b and the fourth outer surface 19d. Also, in the second base 41, the second recess 61 may be provided on the second outer surface 49b.

[0117] Also, if the bottom wall 210 is sandwiched in a compressed state in the first direction D1 between the fourth outer surfaces 19d and 49d and the rear panel 112, it does not have to protrude to the D1A side more than the first inner surfaces 15b and 45b and the second inner surfaces 17b and 47b, and can be appropriately designed according to the shape of the rear panel 112.

[0118] Also, the first protrusion 95 and the second protrusion 97 do not have to protrude to the D1A side more than the first inner surface 15b and the second inner surface 17b as long as they can come into contact with the rear panel 112 while elastically deforming when the first base 11 is fixed to the fixing surface 112a, and can be appropriately designed according to the shape of the rear panel 112.

[0119] Also, the bottom wall 210 may have a shape extending convexly or arcuately toward the D1A side.

[0120] Also, instead of the first protrusion 95 and the second protrusion 97, a protrusion extending convexly or arcuately toward the D1A side may be formed on the bottom wall 211, and this protrusion may be used as the "bottom portion" in the present invention.

[0121] Also, with respect to the first protrusion 95, it may be composed of only the first main body portion 95a or only the first extending portion 95b. The same applies to the second protrusion 97.

[0122] Also, by locking the first and second attachment portions 15 and 17 to the fixing surface 112a, the first and third bases 11 and 71 may be fixed to the fixing surface 112a. The same applies to the first and second attachment portions 45 and 47.

[0123] Also, instead of the back door 103, in addition to a side door or a sliding door, a trunk lid, a bonnet hood, etc. may be used as the "opening and closing body" in the present invention.

Industrial Applicability

[0124] The present invention can be used in vehicles such as automobiles, buses, or industrial vehicles.

Explanation of Reference Numerals

[0125] 1 - 4... Dampers for the opening and closing body 11, 41, 71... First to third bases (bases) 13, 43, 73, 93... First to fourth elastic bodies (elastic bodies) 15, 45... First attachment portions 15b, 45b... First back surfaces (surfaces to be fixed) 17, 47... Second attachment portions 17b, 47b... Second back surfaces (surfaces to be fixed) 19, 49... Holding portions 19a - 19d, 49a - 49d... First to fourth outer surfaces 22... Insertion holes 22a - 22d... First to fourth inner surfaces 23... Buffer portions 25... First concave portions 27, 28... First and second ribs (ribs) 51... First convex portions (convex portions) 61... Second concave portions 61a... First end surfaces 61b... Second end surfaces 95... First protrusions (bottoms) 97... Second protrusions (bottoms) 100…Vehicle 101…Vehicle body 103…Back door (opening / closing body) 103a…Contact surface 105…Opening 112a…Fixed surface 210…Bottom wall (bottom) D1~D3…First to third directions

Claims

1. A damper for an opening / closing body used between a vehicle body provided with an opening and an opening / closing body attached to the vehicle body so as to be able to open and close the opening, One member, which is one of the vehicle body and the opening / closing body, has a fixed surface, The other member, which is the other of the vehicle body and the opening / closing body, has a contact surface, A base fixed to the fixed surface, An elastic body made of an elastic material, held by the base and capable of contacting the contact surface when the opening / closing body is closed, The base has a plate-shaped attachment portion having a fixed surface to be fixed to the fixed surface, and a holding portion that is integral with the attachment portion and is disposed within the elastic body to hold the elastic body, The elastic body extends in a first direction perpendicular to the fixed surface, a second direction orthogonal to the first direction, and a third direction orthogonal to the first direction and the second direction, and an insertion hole into which the holding portion is inserted from one side in the second direction is formed, The insertion hole has a first inner surface, a second inner surface, a third inner surface, and a fourth inner surface in a counterclockwise order when viewed from one side in the second direction, The first inner surface extends in the first direction and the second direction while intersecting the fixed surface, the second inner surface extends in the second direction and the third direction while being continuous with and intersecting the first inner surface, the third inner surface extends in the first direction and the second direction while being continuous with and intersecting the second inner surface, and the fourth inner surface extends in the second direction and the third direction while being continuous with and intersecting the first inner surface and the third inner surface, The holding portion has a first outer surface, a second outer surface, a third outer surface, and a fourth outer surface in a counterclockwise order when viewed from one side in the second direction, The first outer surface extends in the first direction and the second direction so as to face and contact the first inner surface, the second outer surface extends in the second direction and the third direction while being continuous with the first outer surface so as to face and contact the second inner surface, the third outer surface extends in the first direction and the second direction while being continuous with the second outer surface so as to face and contact the third inner surface, and the fourth outer surface extends in the second direction and the third direction while being continuous with the first outer surface and the third outer surface so as to face and contact the fourth inner surface, The first inner surface, the third inner surface, the first outer surface, and the third outer surface are characterized in that the length in the first direction is longer than the length in the first direction of the attachment portion. A damper for an opening / closing body.

2. The attachment portion has a first attachment portion and a second attachment portion located on the opposite side of the first attachment portion with the holding portion interposed therebetween in the second direction. The damper for an opening / closing body according to claim 1.

3. The base is made of resin or metal, The holding portion has a plurality of first recesses recessed in the first direction from at least one of the second outer surface and the fourth outer surface, and ribs provided between the first recesses. The damper for an opening / closing body according to claim 1 or 2.

4. The base is made of metal or resin, The holding portion has a second recess recessed in the first direction from one of the second outer surface and the fourth outer surface. The damper for an opening / closing body according to claim 1 or 2.

5. The second recess has a first end surface extending in the first direction and the third direction at one end in the second direction, and a second end surface extending in the first direction and the third direction at the other end in the second direction, The elastic body protrudes into the second recess from the second inner surface or the fourth inner surface and has a convex portion that abuts against the first end surface and the second end surface. The damper for an opening / closing body according to claim 4.

6. The elastic body has a bottom portion that abuts against the one member while being elastically deformed when the base is fixed to the fixed surface with the holding portion inserted into the insertion hole. The damper for an opening / closing body according to any one of claims 1 to 5.

7. The elastic body has a plurality of buffer portions extending in the third direction while protruding toward the contact surface. The damper for an opening / closing body according to any one of claims 1 to 6.

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