Vehicle seat

Abstract

To provide a vehicle seat having a dynamic damper which achieves improvement of a holding attitude of a mass and low costs and has desired characteristics.SOLUTION: A vehicle seat 1 includes: frames 11a, 12a, 13a; a case 20 attached to the frames 11a, 12a, 13a; and a dynamic damper 30 housed in the case 20 and including a mass 40 and an elastic body 50. The elastic body 50 includes at least an annular elastic body 51 serving as one member having a through hole. The mass 40 is fitted in the thorough hole of the annular elastic body 51. An outer peripheral surface of the annular elastic body 51 is disposed contacting with an inner wall surface of the case 20.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle seat. [Background technology]

[0002] Patent documents 1 to 3 describe providing dynamic dampers in the headrest, seat back, etc. that constitute a vehicle seat for the purpose of reducing vibrations transmitted to the vehicle seat from the vehicle's internal combustion engine and the road surface.

[0003] Patent documents 1 to 3 describe dynamic dampers having a configuration in which a mass is sandwiched between a pair of elastic bodies, while Patent document 2 describes a configuration in which two elastic bodies in the shape of a bottomed container are fitted into both ends of a mass, and a configuration in which sheet-like elastic bodies are placed on each of the six faces of a rectangular parallelepiped mass. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-007480 A [Patent Document 2] JP 2017-141022 A [Patent Document 3] JP 2014-073792 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a configuration in which the mass is sandwiched between a pair of elastic bodies, a gap is likely to form between the mass and the elastic bodies, and the mass may not be stably held. As a result, the dynamic damper may not have the desired characteristics due to the influence of the gap. This can be solved by increasing the accuracy of the shape of the elastic bodies, but this would be costly.

[0006] In addition, in a configuration in which a bottomed container-shaped elastic body is fitted into a mass, when the mass and the elastic body are brought into close contact with each other, the elastic properties may differ between the bottom side and the opening side (opposite the bottom side) of the container shape. Therefore, it is not easy to make the dynamic damper obtain the desired properties. In addition, in a configuration in which elastic sheets are arranged on each side of a rectangular parallelepiped mass, the number of elastic sheets is large, which not only increases the number of parts but also requires assembly labor, resulting in high costs.

[0007] An object of the present invention is to provide a vehicle seat having a dynamic damper with desired characteristics, which improves the mass holding posture, and can be manufactured at low cost. [Means for solving the problem]

[0008] The vehicle seat according to the first aspect of the present invention is ,centreThe dynamic damper includes a frame, a case attached to the frame, and a dynamic damper housed in the case and including a mass and an elastic body. The elastic body includes at least an annular elastic body as one member having a through hole. The mass is fitted into the through hole of the annular elastic body, and an outer peripheral surface of the annular elastic body is arranged in contact with an inner wall surface of the case. The elastic body further includes a first elastic body sheet arranged on one side of the mass in the through hole penetration direction and a separate member from the annular elastic body, and a second elastic body sheet arranged on the other side of the mass in the through hole penetration direction and a separate member from the annular elastic body. The elastic body is arranged between the mass and the inner wall surface of the case in each of the vehicle longitudinal direction, the vehicle lateral direction, and the vehicle vertical direction. The mass is held by the elastic body in a state of being in pressure contact with the elastic body in each of the vehicle longitudinal direction, the vehicle lateral direction, and the vehicle vertical direction, and the elastic body is held by the case in a state of being compressed in each of the vehicle longitudinal direction, the vehicle lateral direction, and the vehicle vertical direction. The mass is formed in a cylindrical or elliptical cylindrical shape, the annular elastic body is formed in a cylindrical or elliptical cylindrical shape, the cylindrical inner surface of the annular elastic body is in contact with the cylindrical outer peripheral surface of the mass, and when the annular elastic body is in a free state, the inner diameter of the inner peripheral surface of the annular elastic body is smaller than the outer diameter of the outer peripheral surface of the mass, and when the mass is fitted into the through hole of the annular elastic body in a non-adhesive state, the annular elastic body maintains the posture of the mass, and the cylindrical inner surface of the annular elastic body is in contact with the cylindrical outer peripheral surface of the mass around the entire circumference. The present invention secondThe vehicle seat of the embodiment includes a frame, a case attached to the frame, and a dynamic damper housed in the case and including a mass and an elastic body. The elastic body includes at least an annular elastic body as one member having a through hole. The mass is fitted into the through hole of the annular elastic body, the outer peripheral surface of the annular elastic body is arranged in contact with the inner wall surface of the case, the mass is formed in a cylindrical or elliptical cylindrical shape, the annular elastic body is formed in a cylindrical or elliptical cylindrical shape, the inner diameter of the inner peripheral surface of the annular elastic body is smaller than the outer diameter of the outer peripheral surface of the mass when the annular elastic body is in a free state, the annular elastic body maintains the posture of the mass when the mass is fitted into the through hole of the annular elastic body in a non-adhesive state, and the cylindrical inner peripheral surface of the annular elastic body is in contact with the columnar outer peripheral surface of the mass over the entire circumference. The present invention thirdThe vehicle seat of this aspect includes a frame, a case attached to the frame, and a dynamic damper housed in the case and including a mass and an elastic body. The elastic body includes at least an annular elastic body as one member having a through hole. The mass is fitted into the through hole of the annular elastic body, and the outer peripheral surface of the annular elastic body is arranged in contact with the inner wall surface of the case, and the elastic body further comprises a first elastic sheet arranged on one side of the mass in the penetration direction of the through hole and which is a separate member from the annular elastic body, and a second elastic sheet arranged on the other side of the mass in the penetration direction of the through hole and which is a separate member from the annular elastic body, and the elastic body is arranged between the mass and the inner wall surface of the case in each of the vehicle fore-and-aft direction, the vehicle left-right direction, and the vehicle up-and-down direction, and the mass is held by the elastic body in a state of being pressed against the elastic body in each of the vehicle fore-and-aft direction, the vehicle left-right direction, and the vehicle up-and-down direction, and the elastic body is held in the case in a state of being compressed in each of the vehicle fore-and-aft direction, the vehicle left-right direction, and the vehicle up-and-down direction. The case comprises a case body having an outer wall surface, and a pair of partition walls erected on an inner wall surface of the case body having a normal component in the fore-and-aft direction of the vehicle and arranged opposite each other in the left-right direction of the vehicle, and the dynamic damper is arranged in an accommodation space formed by the inner wall surface of the case body and the pair of partition walls.

[0009] The mass is fitted into the through hole of the annular elastic body. Therefore, the mass is held in a stable position in the annular elastic body. As a result, the dynamic damper can be easily made to have the desired characteristics. The annular elastic body is also formed in a shape having a through hole (e.g., a cylindrical shape, a frame shape, etc.). Therefore, compared to an elastic body having a bottomed container shape, an annular elastic body having a through hole can suppress a state in which the characteristics differ depending on the portion in the through direction. This also makes it possible to make the dynamic damper have the desired characteristics. [Brief description of the drawings]

[0010] [Figure 1]2 is a partial cross-sectional view of the vehicle seat as viewed from the side; FIG. [Diagram 2] 1 is a front view of a headrest, and shows a damper unit according to a first example. [Diagram 3] 3 is a cross-sectional view taken along line III-III in FIG. 2, and includes a portion of the damper unit and a headrest stay according to the first example. [Figure 4] FIG. 4 is an exploded view of the components in FIG. [Diagram 5] FIG. 3 is a VV cross-sectional view of FIG. 2, including a portion of the damper unit and a headrest stay according to the first example. [Figure 6] FIG. 6 is an exploded view of parts in FIG. 5. [Figure 7] 3 is a cross-sectional view taken along line III-III in FIG. 2, and includes a portion of a damper unit and a headrest stay according to a second example. [Figure 8] FIG. 8 is an exploded view of the components in FIG. [Figure 9] FIG. 3 is a VV cross-sectional view of FIG. 2, including a portion of a damper unit and a headrest stay according to a second example. [Figure 10] FIG. 10 is an exploded view of the components in FIG. [Figure 11] 3 is a cross-sectional view taken along line III-III in FIG. 2, and includes a portion of a damper unit and a headrest stay according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (1. Applicability) The configuration of a vehicle seat 1 will be described with reference to Fig. 1. The vehicle seat 1 mainly includes a seat body 11, a seat back 12, and a headrest 13, as shown in Fig. 1.

[0012] The seat body 11 forms a seat surface and includes a frame 11a and a cushion 11b. The seat back 12 is connected to the seat body 11 so as to be reclining, and includes a frame 12a and a cushion 12b. The headrest 13 is connected to the upper end of the seat back 12 and includes a frame 13a and a cushion 13b. Here, the frame 13a of the headrest 13 is called a headrest stay.

[0013] The vehicle seat 1 further includes a damper unit 2. The damper unit 2 includes a case 20 and a dynamic damper 30 housed in the case 20. The damper unit 2 is attached to any one of the frame 11a of the seat body 11, the frame 12a of the seat back 12, and the frame 13a of the headrest 13. In this example, the damper unit 2 is attached to a headrest stay, which is the frame 13a of the headrest 13, but it may be attached to the other frames 11a, 12a.

[0014] A high vibration damping effect can be expected by disposing the dynamic damper 30 on the headrest 13, which is located far from the vibration fulcrum of the vehicle seat 1. Also, since the seat back 12 rocks around a support point on the seat body 11, the dynamic damper 30 can also exert a high vibration damping effect by disposing it on the headrest 13.

[0015] (2. Configuration of headrest 13) The configuration of headrest 13 will be described with reference to Fig. 2. As shown in Fig. 2, headrest 13 includes a headrest stay serving as frame 13a, and cushion 13b (indicated by a two-dot chain line) having cushioning properties.

[0016] The headrest stay as the frame 13a is formed in a U-shape, with both ends of the U-shape located below the vehicle and the U-shaped connecting portion located above the vehicle. The headrest stay (13a) includes a pair of legs 16, 16 and a connecting portion 17 that connects the base ends of the pair of legs 16, 16. The pair of legs 16, 16 may be formed in a straight line or in a curved shape in the middle. The tips of the pair of legs 16, 16 (both ends of the U-shape) are to be fitted into the seat back 12 (shown in FIG. 1). The connecting portion 17 (U-shaped connecting portion) of the headrest stay (13a) may be formed in a straight line as shown in FIG. 2, or in a curved shape.

[0017] The cushion 13b includes a bag-shaped skin body and a foam member disposed inside the skin body, and the skin body and the foam member are integrated together. The cushion 13b covers the connection portion 17 of the headrest stay (13a) and the base end side of the pair of legs 16, 16, and exposes the tips of the pair of legs 16, 16 of the headrest stay (13a). The shape of the cushion 13b is formed into any shape depending on the vehicle.

[0018] (3. Example of a damper unit) (3-1. First Example) A first example of the damper unit 2 will be described with reference to Figures 2 to 6. As shown in Figure 2, the damper unit 2 is attached to a headrest stay (13a) as an example.

[0019] The damper unit 2 includes a case 20 attached to the frame 13a, and a dynamic damper 30 housed in the case 20. The case 20 is fixed to a portion of the frame 13a that is closer to the base end than the axial center of the pair of legs 16, 16, and to the connection portion 17. The case 20 is not limited to the above, and may be fixed to any position on the frame 13a.

[0020] 3 to 6, the case 20 includes case bodies 21 and 22 having outer wall surfaces, and partition walls 23 and 24 erected on the inner wall surfaces of the case bodies 21 and 22. The case 20 is composed of two members (21, 23 and 22, 24). Of course, the case 20 may be composed of three or more members.

[0021] In this example, the case 20 includes a first case body 21 as a case body. The first case body 21 is formed in a container shape having an opening. The container shape includes a bottom surface and a peripheral wall that surrounds the periphery of the bottom surface. In other words, the peripheral wall has an opening on the opposite side of the bottom surface. In this example, the first case body 21 has a bottom surface that does not have a through hole. It is not necessary for there to be a clear boundary between the bottom surface and the peripheral wall.

[0022] The first case body 21 is disposed rearward of the headrest stay (13a) with respect to the vehicle. The first case body 21 includes an attachment portion 21a and a damper holding portion 21b. The attachment portion 21a is formed in a shape corresponding to a portion to be attached to the headrest stay (13a). In other words, the attachment portion 21a is formed in a U-shape corresponding to the vicinity of the base ends of the pair of legs 16, 16 and the connection portion 17.

[0023] In this example, the mounting portion 21a is formed in a shape that faces one surface (rear surface) in the vehicle front-rear direction of the mounting target portion of the headrest stay (13a) over its entire length. However, the mounting portion 21a may have any shape as long as it is partially connected to the mounting target portion of the headrest stay (13a). Furthermore, when the damper unit 2 is attached to the seat body 11 or the seat back 12, it is formed in a shape that corresponds to the shape of the corresponding frames 11a, 12a.

[0024] Further, on the inner wall surface side of the mounting portion 21a, a plurality of supports 21a1 for positioning the headrest stay (13a) are provided intermittently in the extending direction of the headrest stay (13a). The supports 21a1 have a concave portion that corresponds to the axis-perpendicular cross-sectional shape of the outer shape of the headrest stay (13a). In this example, the supports 21a1 have a circular arc concave portion. For example, two supports 21a1 are provided for each leg portion 16, and two supports are provided for the connection portion 17. Of course, the number of supports 21a1 can be determined arbitrarily.

[0025] Furthermore, although not shown, the mounting portion 21a has a portion for coupling to the second case body 22 described later. The mounting portion 21a includes, as a coupling mechanism, for example, a locking claw, a tube for inserting a fastening member such as a bolt, or the like.

[0026] The damper holding portion 21b constituting the first case body 21 is integrally formed continuous with the mounting portion 21a, and in this example, is provided in the central portion of the U-shaped mounting portion 21a. The damper holding portion 21b constitutes a part of the bottom surface of the first case body 21, and is provided in the entire central portion of the mounting portion 21a. The inner wall surface of the damper holding portion 21b is formed in a rectangular and flat shape. However, the damper holding portion 21b may adopt any outer shape such as a circle, an ellipse, or another polygon other than a rectangle, and may adopt any surface shape such as a curved surface or an uneven surface other than a flat surface.

[0027] The case 20 includes a first partition wall 23 as a partition wall. The first partition wall 23 is provided on an inner wall surface of the first case body 21 and stands on a surface of the inner wall surface having a normal component in the vehicle front-rear direction. The first partition wall 23 is provided on an inner wall surface of the damper holding portion 21b of the first case body 21. Particularly in this example, the first partition wall 23 is formed so as to extend in the vehicle front-rear direction.

[0028] In this example, the first partition wall 23 is formed in a continuous rectangular frame shape. That is, the first partition wall 23 has a pair of walls arranged opposite to each other in the left-right direction of the vehicle and a pair of walls arranged opposite to each other in the up-down direction of the vehicle. Therefore, the damper holding portion 21b of the first case body 21 and the first partition wall 23 form a rectangular container shape.

[0029] The case 20 includes a second case body 22 in addition to a first case body 21 as a case body. The second case body 22 closes the opening of the first case body 21. In this example, the second case body 22 may be formed in a container shape having an opening, or may be formed in a simple lid shape. In this example, the second case body 22 is formed in the same shape as the first case body 21. Therefore, the second case body 22 is formed in a container shape having an opening.

[0030] The second case body 22 is disposed in front of the headrest stay (13a) in the vehicle. The second case body 22 includes an attachment portion 22a and a damper holding portion 22b, similar to the first case body 21. The attachment portion 22a includes a plurality of support members 22a1, similar to the attachment portion 21a of the first case body 21.

[0031] The case 20 includes a second partition wall 24 as a partition wall in addition to the first partition wall 23. The second partition wall 24 is provided on an inner wall surface of the second case body 22. The second partition wall 24 is formed in the same shape as the first partition wall 23. The second partition wall 24 has a pair of walls arranged opposite to each other in the left-right direction of the vehicle and a pair of walls arranged opposite to each other in the up-down direction of the vehicle. Therefore, the damper holding portion 22b of the second case body 22 and the second partition wall 24 form a rectangular container shape.

[0032] A rectangular container shape formed by the first case body 21 and the first partition wall 23 and a rectangular container shape formed by the second case body 22 and the second partition wall 24 form a rectangular parallelepiped storage space 20a. The storage space 20a is a closed space. That is, the damper holding portion 21b of the first case body 21 and the damper holding portion 22b of the second case body 22 are arranged opposite to each other in the vehicle longitudinal direction, and form a pair of walls in the vehicle longitudinal direction. A pair of walls in the vehicle transverse direction of the first partition wall 23 and a pair of walls in the vehicle transverse direction of the second partition wall 24 form a pair of walls in the vehicle transverse direction. A pair of walls in the vehicle vertical direction of the first partition wall 23 and a pair of walls in the vehicle vertical direction of the second partition wall 24 form a pair of walls in the vehicle vertical direction.

[0033] The dynamic damper 30 is disposed in an accommodation space 20a formed by the case 20. The dynamic damper 30 includes a mass 40 and an elastic body 50. The mass 40 is formed of, for example, metal. The mass 40 is formed in any shape. In this example, the mass 40 is formed in a cylindrical shape. The mass 40 may also be formed in an elliptical cylindrical shape, a polygonal cylindrical shape, a spherical shape, or the like. By forming the mass 40 in a shape other than a sphere, it is possible to provide anisotropy and thus provide vibration damping characteristics that differ depending on the directionality.

[0034] The mass 40 is disposed, for example, so that the central axis of the column extends in the vehicle up-down direction. In other words, the mass 40 is disposed so that the direction perpendicular to the central axis of the column extends in the vehicle front-rear direction and the vehicle left-right direction. The posture of the mass 40 may be changed according to the vibration damping characteristics.

[0035] Here, in mass 40, a peripheral surface connecting the front and rear surfaces of mass 40 and the left and right surfaces of mass 40 is defined as a first peripheral surface. In addition, in mass 40, a peripheral surface connecting the front and rear surfaces of mass 40 and the top and bottom surfaces of mass 40 is defined as a second peripheral surface. In mass 40, a peripheral surface connecting the left and right surfaces of mass 40 and the top and bottom surfaces of mass 40 is defined as a third peripheral surface. When mass 40 is formed in a cylindrical shape and disposed in the above-mentioned position, the first peripheral surface is a cylindrical surface, and the second and third peripheral surfaces are surfaces connecting both end surfaces of the cylinder and the cylindrical surface of the cylinder.

[0036] In this example, the center of gravity of the mass 40 is located at the center of the mass 40. The first peripheral surface of the mass 40 described above includes the front-rear and left-right points of the vehicle with respect to the center of gravity of the mass 40. The second peripheral surface of the mass 40 includes the front-rear and left-right points of the vehicle with respect to the center of gravity of the mass 40. The third peripheral surface of the mass 40 includes the left-right and top-bottom points of the vehicle with respect to the center of gravity of the mass 40. The center of gravity of the mass 40 may be located at a position shifted from the center of the mass 40, in which case the first peripheral surface, the second peripheral surface, and the third peripheral surface are configured to include points corresponding to the center of gravity.

[0037] The elastic body 50 holds the mass 40 and is housed in the case 20. The elastic body 50 can be made of a foamed resin material having elasticity, an elastic material such as rubber or elastomer, or a composite material of these. In particular, in this example, the elastic body 50 is made of a foamed resin material.

[0038] The elastic body 50 is sandwiched between the mass 40 and the case 20. In this example, the elastic body 50 is in contact with the entire surface of the mass 40, and maintains the posture of the mass 40. The elastic body 50 is also arranged in contact with the inner wall surface of the case 20. In particular, the elastic body 50 is arranged in the accommodation space 20a of the case 20 in a compressed state in the vehicle front-rear direction, the vehicle left-right direction, and the vehicle up-down direction.

[0039] In this example, the elastic body 50 includes at least an annular elastic body 51 as one member having a through hole. The annular elastic body 51 may be formed in a continuous ring shape around the entire circumference in the circumferential direction, or may be formed in a C-shape with a slit (notch) at one location. However, in this case, the annular elastic body 51 is formed in an annular shape when assembled. In addition, the term "annular" is not limited to a circular ring shape, but includes an elliptical ring shape and a polygonal ring shape.

[0040] The mass 40 is fitted in the through hole of the annular elastic body 51 in a non-adhesive state, and the posture of the mass 40 is maintained. The inner peripheral surface of the annular elastic body 51 is arranged in contact with any one of the first peripheral surface, the second peripheral surface, and the third peripheral surface of the mass 40. In this example, the annular elastic body 51 has a through hole penetrating in the vehicle front-rear direction. The annular elastic body 51 is arranged in contact with the third peripheral surface (the left and right surfaces of the vehicle and the top and bottom surfaces of the vehicle) of the mass 40 over the entire circumference. The annular elastic body 51 is formed in a rectangular frame shape. That is, the inner peripheral surface and the outer peripheral surface of the annular elastic body 51 are formed in a rectangular shape. The inner peripheral surface of the annular elastic body 51 is formed in a rectangular shape with the vehicle up-down direction as the longitudinal direction.

[0041] The annular elastic body 51 is formed in a flat shape, that is, a shape in which the thickness in the penetration direction is smaller than the outer shape in the direction perpendicular to the penetration direction. The thickness of the annular elastic body 51 in the penetration direction is smaller than the maximum thickness of the mass 40 in the vehicle front-rear direction. In other words, when the mass 40 is fitted into the through hole of the annular elastic body 51, it protrudes from the first opening of the annular elastic body 51 and also protrudes from the second opening of the annular elastic body 51 (the opening opposite the first opening).

[0042] Moreover, the separation distance in the vehicle left-right direction on the inner circumferential surface of the annular elastic body 51 is slightly smaller than the maximum thickness of the mass 40 in the vehicle left-right direction. Therefore, when the mass 40 is fitted into the through hole of the annular elastic body 51, the mass 40 is compressed in the vehicle left-right direction by the annular elastic body 51. Moreover, the separation distance in the vehicle up-down direction on the inner circumferential surface of the annular elastic body 51 is slightly smaller than the maximum length of the mass 40 in the vehicle up-down direction. Therefore, when the mass 40 is fitted into the through hole of the annular elastic body 51, the mass 40 is compressed in the vehicle up-down direction by the annular elastic body 51.

[0043] Further, the elastic body 50 includes a first elastic sheet 52 in addition to the annular elastic body 51. The first elastic sheet 52 is formed in a flat shape, and has, for example, the same outer peripheral shape as the annular elastic body 51. In this example, the first elastic sheet 52 is formed in the same rectangular shape as the outer shape of the annular elastic body 51. The first elastic sheet 52 is disposed overlapping the end face of the annular elastic body 51 on the first opening side in the penetration direction. In other words, the first elastic sheet 52 closes the first opening (the opening toward the rear of the vehicle) of the through hole of the annular elastic body 51.

[0044] The first elastic sheet 52 may be arranged so that at least a part of the annular elastic body 51 is adhered and the remaining part is not adhered, or it may be arranged so that it is not adhered to the entire surface of the annular elastic body 51. When it is adhered, the relative positioning of the two can be maintained with high accuracy. On the other hand, when it is not adhered, the manufacturing man-hours can be reduced.

[0045] The surface of the first elastic sheet 52 that contacts the annular elastic body 51 is formed in a flat shape. The first elastic sheet 52 contacts in a compressed state with the surface of the mass 40 that protrudes from the first opening toward the rear of the vehicle.

[0046] The first elastic sheet 52 is molded from a foamed resin material, rubber, elastomer, or the like, similar to the annular elastic body 51. However, the first elastic sheet 52 may be molded from a material different from that of the annular elastic body 51, or may be molded from the same material as that of the annular elastic body 51. By molding the two from different materials, it is possible to provide vibration damping characteristics that differ depending on the directionality.

[0047] Further, the elastic body 50 includes a second elastic body sheet 53 in addition to the annular elastic body 51 and the first elastic body sheet 52. The second elastic body sheet 53 is formed in a flat shape like the first elastic body sheet 52, and has, for example, the same outer peripheral shape as the outer peripheral shape of the annular elastic body 51. In this example, the second elastic body sheet 53 is formed in a rectangular shape that is the same as the outer shape of the annular elastic body 51. The second elastic body sheet 53 is formed in the same shape as the first elastic body sheet 52. The second elastic body sheet 53 is arranged overlapping the end face of the annular elastic body 51 in the penetration direction on the second opening side. In other words, the second elastic body sheet 53 closes the second opening (the opening in the front of the vehicle) of the through hole of the annular elastic body 51.

[0048] The second elastic sheet 53 may be adhered to at least a portion of the annular elastic body 51, or may be disposed without being adhered to the entire surface of the annular elastic body 51. When it is adhered, the relative positioning of the two can be maintained with high accuracy. On the other hand, when it is not adhered, the manufacturing man-hours can be reduced.

[0049] The surface of the second elastic sheet 53 that contacts the annular elastic body 51 is formed in a flat shape. The second elastic sheet 53 contacts, in a compressed state, the surface of the mass 40 that protrudes from the second opening toward the rear of the vehicle. In other words, the first elastic sheet 52 and the second elastic sheet 53 sandwich the mass 40 in the front-rear direction of the vehicle.

[0050] The second elastic sheet 53 is molded from a foamed resin material, rubber, elastomer, or the like, similar to the annular elastic body 51. However, the second elastic sheet 53 may be molded from a material different from that of the annular elastic body 51, or may be molded from the same material as that of the annular elastic body 51. By molding the two from different materials, it is possible to have vibration damping characteristics that differ depending on the directionality. However, it is preferable that the second elastic sheet 53 is molded from the same material as the first elastic sheet 52.

[0051] As described above, the mass 40 is fitted into a space surrounded by the inner circumferential surface of the annular elastic body 51, one surface in the thickness direction of the first elastic sheet 52, and one surface in the thickness direction of the second elastic sheet 53. The mass 40 does not need to be in contact over the entire surface, and may be arranged with a gap in a portion. However, the mass 40 is held so that it can maintain its posture in all directions, including the front-rear direction of the vehicle, the left-right direction of the vehicle, and the up-down direction of the vehicle.

[0052] The dynamic damper 30, which is composed of the mass 40 and the elastic body 50, is disposed in the accommodation space 20a of the case 20. In this example, the outer shape of the elastic body 50 is formed into a rectangular parallelepiped shape corresponding to the accommodation space 20a. In detail, the outer shape of the elastic body 50 is formed into a rectangular parallelepiped shape slightly larger than the accommodation space 20a.

[0053] A pair of surfaces of the outer circumferential surface of the annular elastic body 51 in the left-right direction of the vehicle are arranged in contact with a pair of walls in the left-right direction of the vehicle, the first partition wall 23 and the second partition wall 24. In other words, the portions of the annular elastic body 51 facing each other in the left-right direction of the vehicle are compressed in the left-right direction of the vehicle by the mass 40 and the partition walls 23, 24.

[0054] A pair of surfaces of the outer circumferential surface of the annular elastic body 51 in the vertical direction of the vehicle are arranged in contact with a pair of walls in the vertical direction of the vehicle, the first partition wall 23 and the second partition wall 24. In other words, the portions of the annular elastic body 51 facing each other in the vertical direction of the vehicle are compressed in the vertical direction of the vehicle by the mass 40 and the partition walls 23, 24.

[0055] The first elastic sheet 52 is disposed on the first case body 21 side in the accommodation space 20a. The other surface (vehicle rear surface) in the thickness direction of the first elastic sheet 52 is disposed in contact with the damper holding portion 21b of the first case body 21 over the entire surface. In other words, the central portion of the first elastic sheet 52 is compressed in the vehicle front-rear direction by the mass 40 and the inner wall surface of the damper holding portion 21b of the first case body 21.

[0056] Similarly to the annular elastic body 51, the flat outer peripheral surface of the first elastic sheet 52 is disposed in contact with the first partition wall 23 and the second partition wall 24. In other words, the first elastic sheet 52 is compressed by the first partition wall 23 and the second partition wall 24 in the left-right direction and the up-down direction of the vehicle.

[0057] The second elastic sheet 53 is disposed on the second case body 22 side in the accommodation space 20a. The other surface in the thickness direction of the second elastic sheet 53 (the surface facing the vehicle front) is disposed in contact with the entire surface of the damper holding portion 22b of the second case body 22. In other words, the central portion of the second elastic sheet 53 is compressed in the vehicle front-rear direction by the mass 40 and the inner wall surface of the damper holding portion 22b of the second case body 22.

[0058] Similarly to the annular elastic body 51, the flat outer peripheral surface of the second elastic sheet 53 is disposed in contact with the first partition wall 23 and the second partition wall 24. In other words, the second elastic sheet 53 is compressed by the first partition wall 23 and the second partition wall 24 in the left-right direction and the up-down direction of the vehicle.

[0059] The annular elastomer 51, the outer peripheral portion of the first elastomer sheet 52, and the outer peripheral portion of the second elastomer sheet are compressed in the fore-and-aft direction of the vehicle by the inner wall surface of the damper retaining portion 21b of the first case body 21 and the inner wall surface of the damper retaining portion 22b of the second case body 22.

[0060] As described above, the mass 40 is fitted into the through hole of the annular elastic body 51. Therefore, the mass 40 is held in a stable position by the annular elastic body 51. As a result, the dynamic damper 30 can be easily made to have the desired characteristics. Moreover, the annular elastic body 51 is formed in a shape having a through hole. Therefore, the annular elastic body 51 having a through hole can suppress a state in which the characteristics differ depending on the portion in the through direction, compared to an elastic body having a bottomed container shape. This also allows the dynamic damper 30 to have the desired characteristics.

[0061] Moreover, the elastic body 50 has a three-layer structure made up of annular elastic body 51, first elastic sheet 52, and second elastic sheet 53. In this way, by adding both sheets 52 and 53 to the annular elastic body 51 as a base, the elastic body 50 has a stable posture-maintaining force for the mass 40 and can have desired vibration-damping characteristics in each direction. The dynamic damper 30 can have desired characteristics in each direction, for example, the vehicle front-rear direction, the vehicle left-right direction, and the vehicle up-down direction.

[0062] In particular, since the elastic body 50 has the above-mentioned three-layer structure, it is easy to make the material of the annular elastic body 51 different from the materials of the first elastic body sheet 52 and the second elastic body sheet 53. As a result, the dynamic damper 30 can easily set vibration damping characteristics according to direction while having a stable posture-maintaining force for the mass 40. However, even if the material of the annular elastic body 51 and the material of the first elastic body sheet 52 and the second elastic body sheet 53 are the same material, it is also possible to set vibration damping characteristics according to direction by making the thickness different depending on the direction.

[0063] (3-2. Second example) A second example of the damper unit 102 will be described with reference to Figs. 7 to 10. In the following, the damper unit 102 of the second example will be described mainly with respect to the parts that are different from the damper unit 2 of the first example. Note that the same reference numerals are used for the same configurations as in the first example.

[0064] The damper unit 102 includes a case 120 and a dynamic damper 130. The case 120 includes a first case body 121, a second case body 122, a first partition wall 123, and a second partition wall 124.

[0065] The first case body 121 has an attachment portion 121a similar to the attachment portion 21a of the first example. The first case body 121 further has a damper holding portion 121b. The damper holding portion 121b has a different shape from the damper holding portion 21b of the first example, but has the same function. The damper holding portion 121b is formed in a curved shape that is approximately similar to a semi-cylindrical shape. The outer wall surface of the damper holding portion 121b is formed in a curved convex shape, and the inner wall surface is formed in a curved concave shape. In addition, the damper holding portion 121b has half (semicircular shape) of both end surfaces of the approximately cylindrical shape. The damper holding portion 121b is not limited to a semi-cylindrical shape, and may be a semi-elliptical cylindrical shape.

[0066] The second case body 122 is formed in the same shape as the first case body 121. The second case body 122 has an attachment portion 122a similar to the attachment portion 22a of the first example. The second case body 122 further includes a damper holding portion 122b having the same shape as the damper holding portion 121b of the first case body 121.

[0067] The first partition wall 123 is provided on the inner wall surface of the first case body 121, and forms a peripheral wall provided on the outside of the damper holding portion 121b. The second partition wall 124 is provided on the inner wall surface of the second case body 122, and forms a peripheral wall provided on the outside of the damper holding portion 122b. The first partition wall 123 and the second partition wall 124 are formed in a rectangular frame shape. In particular, the first partition wall 123 and the second partition wall 124 are formed in a rectangular frame shape with the longitudinal direction being the vehicle up-down direction.

[0068] Therefore, the damper holding portion 121b of the first case body 121 and the first partition wall 123 form a rectangular container shape having a curved bottom surface. Also, the damper holding portion 122b of the second case body 122 and the second partition wall 124 form a rectangular container shape having a curved bottom surface. Then, the rectangular container shape formed by the first case body 121 and the first partition wall 123 and the rectangular container shape formed by the second case body 122 and the second partition wall 124 form the accommodation space 120a. The accommodation space 120a is a space having a shape that is approximately cylindrical.

[0069] The dynamic damper 130 is disposed in the accommodation space 120a formed by the case 120 and includes a mass 140 and an elastic body 150. In this example, the mass 140 is formed in a cylindrical shape. However, the mass 140 may be formed in a regular polygonal prism shape.

[0070] The elastic body 150 includes at least an annular elastic body 151 as one component having a through hole. The annular elastic body 151 is formed in a cylindrical shape. The annular elastic body 151 has the same radial thickness. That is, the annular elastic body 151 has a cylindrical inner peripheral surface and a cylindrical outer peripheral surface. However, the annular elastic body 151 may have a cylindrical inner peripheral surface and an elliptical cylindrical outer peripheral surface. In this case, the radial thickness of the annular elastic body 151 varies depending on the circumferential position.

[0071] The inner diameter of the inner peripheral surface of the annular elastic body 151 is slightly smaller than the outer diameter of the outer peripheral surface of the mass 140. The mass 140 is fitted in a non-adhesive state into the through hole of the annular elastic body 151, thereby maintaining the posture of the mass 140. In other words, the cylindrical inner peripheral surface of the annular elastic body 151 is in contact with the columnar outer peripheral surface of the mass 140 over the entire circumference.

[0072] Here, the inner peripheral surface of the annular elastic body 151 is arranged in contact with any one of the first peripheral surface, the second peripheral surface, and the third peripheral surface of the mass 140. In this example, the annular elastic body 151 has a through hole penetrating in the vertical direction of the vehicle. The annular elastic body 151 is arranged in contact with the first peripheral surface (the front / rear surfaces and the left / right surfaces of the vehicle) of the mass 140 over the entire circumference.

[0073] The elastic body 150 further includes a first elastic body sheet 152 and a second elastic body sheet 153. The first elastic body sheet 152 and the second elastic body sheet 153 are formed in a disk shape. The first elastic body sheet 152 is fitted into the first opening side of the through hole of the annular elastic body 151 and contacts the surface of the mass 140 on the first opening side. The second elastic body sheet 153 is fitted into the second opening side of the through hole of the annular elastic body 151 and contacts the surface of the mass 140 on the second opening side.

[0074] The dynamic damper 130, which is composed of the mass 140 and the elastic body 150, is disposed in the accommodation space 120a of the case 120. In this example, the outer shape of the elastic body 150 is substantially cylindrical, and has a shape that corresponds to the accommodation space 120a, which has a shape that is approximately cylindrical.

[0075] A portion of the outer peripheral surface of the annular elastic body 151 in the vehicle longitudinal direction is compressed in the vehicle longitudinal direction by the inner wall surface of the damper holding portion 121b of the first case body 121 and the inner wall surface of the damper holding portion 122b of the second case body 122. In addition, a portion of the outer peripheral surface of the annular elastic body 151 in the vehicle lateral direction is compressed in the vehicle lateral direction by the first partition wall 123 and the second partition wall 124.

[0076] The annular elastic body 151 is compressed in the vehicle up-down direction by the first partition wall 123 and the second partition wall 124. The first elastic sheet 152 is compressed in the vehicle up-down direction by the first partition wall 123 and the second partition wall 124 and the axial end face of the mass 140. The second elastic sheet 153 is compressed in the vehicle up-down direction by the first partition wall 123 and the second partition wall 124 and the axial end face of the mass 140.

[0077] As described above, the mass 140 is fitted into the through hole of the annular elastic body 151. Therefore, the mass 140 is held in a stable position by the annular elastic body 151. As a result, the dynamic damper 130 can be easily made to have desired characteristics.

[0078] (3-3. Third example) A damper unit 202 of the third example will be described with reference to Fig. 11. In the following, the damper unit 202 of the third example will be described mainly with respect to the portions different from the damper unit 102 of the second example. Note that the same reference numerals will be used to denote the same configurations as those of the second example.

[0079] The damper unit 202 of the third example differs from the damper unit 102 of the second example only in the shape of the damper holding portions 221b, 222b, the mass 240, and the annular elastic body 251 of the elastic body 250. The damper holding portions 221b, 222b are formed in a curved shape that is approximately similar to a semi-elliptical cylinder. The mass 240 is formed in an elliptical column shape, and the annular elastic body 251 is formed in an elliptical cylinder shape.

[0080] Mass 240 and annular elastic body 251 are housed in case 20 so that the long axis of the ellipse coincides with the vehicle left-right direction and the short axis of the ellipse coincides with the vehicle front-rear direction. Therefore, the areas faced by mass 240 are different in the vehicle front-rear direction and the vehicle left-right direction. As a result, it is possible to make the vibration damping characteristics different between the vehicle front-rear direction and the vehicle left-right direction. [Explanation of symbols]

[0081] 1: vehicle seat, 2,102,202: damper unit, 11: seat body, 11a: frame, 11b: cushion, 12: seat back, 12a: frame, 12b: cushion, 13: headrest, 13a: frame, 13b: cushion, 16: leg, 17: connection portion, 20,120: case, 20a,120a: storage space, 21,121: first case body, 21a,121a: mounting portion, 21a1: support material, 21b,121b,221b: damper holding portion, 22,122: second case body, 22a,122a: mounting portion, 22a1: support material, 22b,122b,222b: damper holding portion, 23,123: first partition wall, 24,124: second partition wall, 30,130: dynamic damper, 40,140,240: mass, 50,150: elastic body, 51,151,251: annular elastic body, 52,152: first elastic body sheet, 53,153: second elastic body sheet

Claims

1. A frame, a case attached to the frame; and a dynamic damper housed in the case and including a mass and an elastic body; A vehicle seat comprising: The elastic body includes at least an annular elastic body as a member having a through hole, The mass is fitted into the through hole of the annular elastic body, The outer circumferential surface of the annular elastic body is disposed in contact with the inner wall surface of the case, The elastic body further includes a first elastic sheet that is disposed on one side of the mass in a penetration direction of the through hole and is a separate member from the annular elastic body; a second elastic sheet that is disposed on the other side of the mass in the penetration direction of the through hole and is a separate member from the annular elastic body, the elastic body is disposed between the mass and an inner wall surface of the case in each of the vehicle front-rear direction, the vehicle left-right direction, and the vehicle up-down direction, the mass is held by the elastic body in a state of being in pressure contact with the elastic body in each of the vehicle longitudinal direction, the vehicle left-right direction, and the vehicle up-down direction, and the elastic body is held in the case in a state of being compressed in each of the vehicle longitudinal direction, the vehicle left-right direction, and the vehicle up-down direction, The mass is formed in a cylindrical or elliptical cylindrical shape, The annular elastic body is formed into a cylindrical or elliptical cylindrical shape, a cylindrical inner peripheral surface of the annular elastic body contacts a columnar outer peripheral surface of the mass, When the annular elastic body is in a free state, an inner diameter of an inner peripheral surface of the annular elastic body is smaller than an outer diameter of an outer peripheral surface of the mass, the annular elastic body holds the posture of the mass in a state where the mass is fitted in the through hole of the annular elastic body in a non-adhesive manner, The cylindrical inner peripheral surface of the annular elastic body is in contact with the columnar outer peripheral surface of the mass over the entire circumference. Vehicle seat.

2. the first elastic sheet is fitted into a first opening side of the through hole of the annular elastic body and is in contact with a surface of the mass on the first opening side, 2. The vehicle seat according to claim 1, wherein the second elastic sheet is fitted into a second opening side of the through hole of the annular elastic body opposite the first opening and contacts a surface of the mass on the second opening side.

3. The mass has a length in a penetrating direction of the through hole that is longer than a width in a radial direction, The vehicle seat according to claim 1 or 2, wherein the length of the annular elastic body in a penetrating direction of the through hole is longer than the width of the annular elastic body in a radial direction.

4. A frame, a case attached to the frame; and a dynamic damper housed in the case and including a mass and an elastic body; A vehicle seat comprising: The elastic body includes at least an annular elastic body as a member having a through hole, The mass is fitted into the through hole of the annular elastic body, The outer circumferential surface of the annular elastic body is disposed in contact with the inner wall surface of the case, The mass is formed in a cylindrical or elliptical cylindrical shape, The annular elastic body is formed into a cylindrical or elliptical cylindrical shape, When the annular elastic body is in a free state, an inner diameter of an inner peripheral surface of the annular elastic body is smaller than an outer diameter of an outer peripheral surface of the mass, the annular elastic body holds the posture of the mass in a state where the mass is fitted in the through hole of the annular elastic body in a non-adhesive manner, The cylindrical inner peripheral surface of the annular elastic body is in contact with the columnar outer peripheral surface of the mass over the entire circumference. Vehicle seat.

5. The mass has a length in a penetrating direction of the through hole that is longer than a width in a radial direction, The vehicle seat according to claim 4 , wherein the annular elastic body has a length in a penetrating direction of the through hole that is longer than a width in a radial direction of the annular elastic body.

6. The elastic body further comprises: a first elastic sheet that is fitted into a first opening side of the through hole of the annular elastic body and contacts a surface of the mass on the first opening side; a second elastic sheet that is fitted into a second opening side of the through hole of the annular elastic body opposite to the first opening and that contacts a surface of the mass on the second opening side; The vehicle seat according to claim 4 or 5, further comprising:

7. The case is A case body having an outer wall surface; a pair of partition walls that are erected on a surface of an inner wall surface of the case body that has a normal component in a vehicle front-rear direction and are arranged opposite to each other in a vehicle left-right direction; Equipped with The vehicle seat according to any one of claims 1 to 6, wherein the dynamic damper is disposed in an accommodation space defined by the inner wall surface of the case body and the pair of partition walls.

8. A frame, a case attached to the frame; and a dynamic damper housed in the case and including a mass and an elastic body; A vehicle seat comprising: The elastic body includes at least an annular elastic body as a member having a through hole, The mass is fitted into the through hole of the annular elastic body, The outer circumferential surface of the annular elastic body is disposed in contact with the inner wall surface of the case, The elastic body further includes a first elastic sheet that is disposed on one side of the mass in a penetration direction of the through hole and is a separate member from the annular elastic body; a second elastic sheet that is disposed on the other side of the mass in the penetration direction of the through hole and is a separate member from the annular elastic body, the elastic body is disposed between the mass and an inner wall surface of the case in each of the vehicle front-rear direction, the vehicle left-right direction, and the vehicle up-down direction, the mass is held by the elastic body in a state of being in pressure contact with the elastic body in each of the vehicle longitudinal direction, the vehicle left-right direction, and the vehicle up-down direction, and the elastic body is held in the case in a state of being compressed in each of the vehicle longitudinal direction, the vehicle left-right direction, and the vehicle up-down direction, The case includes a case body having an outer wall surface, and a pair of partition walls that are erected on an inner wall surface of the case body that has a normal component in the vehicle front-rear direction and are arranged opposite to each other in the vehicle left-right direction, and the dynamic damper is arranged in an accommodation space formed by the inner wall surface of the case body and the pair of partition walls. Vehicle seat.

9. the first elastic sheet is disposed over an end surface of the annular elastic body in a penetration direction on the first opening side and in contact with a surface of the mass on the first opening side; The vehicle seat according to claim 8, wherein the second elastic sheet is arranged overlapping a penetrating end face of the annular elastic body on a second opening side opposite the first opening, and contacts a surface of the mass on the second opening side.

10. The vehicle seat according to claim 9 , wherein the mass protrudes from the first opening of the annular elastic body and protrudes from the second opening of the annular elastic body.

11. The vehicle seat according to claim 9 or 10, wherein the annular elastic body is formed in a flat shape having a thickness in a penetration direction that is smaller than an outer shape in a direction perpendicular to the penetration direction.

12. The annular elastic body and the first elastic sheet are formed from different materials, The vehicle seat according to any one of claims 9 to 11, wherein the annular elastic body and the second elastic sheet are formed from different materials.

13. The vehicle seat according to any one of claims 9 to 11, wherein the annular elastic body, the first elastic sheet, and the second elastic sheet are molded from the same material.

14. The vehicle seat according to any one of claims 9 to 13, wherein the first elastic sheet and the second elastic sheet are at least partially bonded to the annular elastic body.

15. The vehicle seat according to any one of claims 9 to 13, wherein the first elastic sheet and the second elastic sheet are arranged on the annular elastic body without being adhered to the annular elastic body.

16. The annular elastic body is formed in a rectangular frame shape, The vehicle seat according to any one of claims 9 to 15, wherein the first elastic sheet and the second elastic sheet are formed in the same rectangular shape as the outer shape of the annular elastic body.

17. The mass is formed in a cylindrical or elliptical cylindrical shape, The annular elastic body is formed into a cylindrical or elliptical cylindrical shape, The vehicle seat according to claim 8 , wherein a cylindrical inner peripheral surface of the annular elastic body is in contact with a columnar outer peripheral surface of the mass.

18. the first elastic sheet is fitted into a first opening side of the through hole of the annular elastic body and is in contact with a surface of the mass on the first opening side, The vehicle seat according to claim 17, wherein the second elastic sheet is fitted into a second opening side of the through hole of the annular elastic body opposite the first opening and contacts a surface of the mass on the second opening side.

19. The mass has a length in a penetrating direction of the through hole that is longer than a width in a radial direction, The vehicle seat according to claim 17 or 18, wherein the length of the annular elastic body in a penetrating direction of the through hole is longer than the width of the annular elastic body in a radial direction.

20. The vehicle seat according to any one of claims 7 to 19, wherein the elastic body is arranged to be compressed in the left-right direction of the vehicle by the pair of partition walls.

21. The case body includes: A first case body is disposed on one side in a vehicle front-rear direction and formed in a container shape having an opening; a second case body formed in a container shape or a lid shape having an opening, the second case body being disposed on the other side in the vehicle front-rear direction and closing the opening of the first case body; Equipped with The vehicle seat according to any one of claims 7 to 20, wherein the elastic body is arranged to be compressed in the vehicle front-rear direction by an inner wall surface of the first case body and an inner wall surface of the second case body.

22. The frame is a headrest stay, The vehicle seat according to any one of claims 1 to 21, wherein the case is attached to the headrest stay.

23. A peripheral surface connecting the front and rear surfaces of the mass and the left and right surfaces of the mass is defined as a first peripheral surface, A peripheral surface connecting the front and rear surfaces of the mass and the upper and lower surfaces of the mass is defined as a second peripheral surface, A peripheral surface connecting the left and right sides of the mass and the upper and lower sides of the mass is a third peripheral surface, A vehicle seat as described in any one of claims 1 to 22, wherein the inner surface of the annular elastic body is arranged in contact with one of the first peripheral surface, the second peripheral surface, and the third peripheral surface of the mass over the entire circumference.

24. The first circumferential surface includes vehicle front and rear points and vehicle left and right points with respect to the center of gravity of the mass, The second circumferential surface includes a vehicle front-rear point and a vehicle top-bottom point relative to the center of gravity of the mass, 24. The vehicle seat of claim 23, wherein the third peripheral surface includes a vehicle left-right point and a vehicle top-bottom point relative to a center of gravity of the mass.

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