Vibration reduction device and vehicle seat

Abstract

To support a plurality of annular members so as to be movable along a shaft member.SOLUTION: A vibration reduction device 10 comprises a shaft member 20, a plurality of annular members 22 which are formed into annular shapes, and arranged while being aligned in an axial direction of the shaft member, and a collar member 24. The collar member 24 has a cylindrical part 40 which is formed into a cylindrical shape, and holds a state that the plurality of annular members 22 are aligned in a state that the cylindrical part 40 is inserted into the plurality of annular members 22. Also, the collar member 24 moves in an axial direction of the shaft member 20 together with the plurality of annular members 22 in a state that the shaft member 20 is inserted into the cylinder part 40.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vibration reduction device and a vehicle seat. [Background technology]

[0002] The following Patent Document 1 discloses a configuration in which a weight member made up of multiple annular members functions as a dynamic damper (vibration reduction device). The weight member described in this document is configured with a male thread portion and the weight member as separate members. The weight member is configured by combining one annular member with multiple washer-shaped annular members, and male thread portions are inserted into these annular members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-237430 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in a vibration reduction device having a configuration in which a plurality of washer-shaped annular members are movable along a shaft member, it is necessary to support the plurality of annular members so as to be movable along the shaft member.

[0005] SUMMARY OF THE PRESENT INVETION The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a vibration reducing device and a vehicle seat that are capable of supporting a plurality of annular members movably along a shaft member. [Means for solving the problem]

[0006] The vibration reduction device of the first embodiment comprises an axial member, a plurality of annular members formed in an annular shape and arranged in the axial direction of the axial member, and a collar member having a cylindrical portion formed in a cylindrical shape, which holds the plurality of annular members arranged in a row when the cylindrical portion is inserted into the plurality of annular members, and which moves in the axial direction of the axial member together with the plurality of annular members when the axial member is inserted into the cylindrical portion.

[0007] According to the vibration reduction device of the first aspect, the cylindrical portions of the collar members are inserted into the plurality of annular members. This allows the plurality of annular members to be maintained in an aligned state. Also, the shaft member is inserted into the collar members. This allows the plurality of annular members to be supported on the shaft member via the collar members, and allows the plurality of annular members to be supported movably along the shaft member.

[0008] The second aspect of the vibration reduction device is the vibration reduction device of the first aspect, wherein the collar member includes a first locking portion protruding radially outward from an end of the tubular portion on one axial side of the shaft member, and a second locking portion protruding radially outward from an end of the tubular portion on the other axial side of the shaft member and capable of being displaced radially inward, and when the tubular portion is inserted into the multiple annular members, the multiple annular members are positioned between the first locking portion and the second locking portion.

[0009] According to the vibration reduction device of the second aspect, the first and second locking portions of the collar member can hold the multiple annular members in an aligned state. Also, the second locking portion of the collar member can be inserted into the multiple annular members by displacing the second locking portion of the collar member radially inward. That is, the collar member can be attached to the multiple annular members by inserting the cylindrical portion of the collar member into the multiple annular members from the second locking portion side.

[0010] The third aspect of the vibration reduction device is the vibration reduction device of the second aspect, wherein coil springs are provided on one axial side and the other axial side of the shaft member relative to the plurality of annular members, and the coil spring arranged on one axial side of the shaft member relative to the plurality of annular members abuts against the annular member while being fitted into the first engagement portion, and the coil spring arranged on the other axial side of the shaft member relative to the plurality of annular members abuts against the annular member while being fitted into the second engagement portion.

[0011] According to the vibration reduction device of the third aspect, one coil spring is fitted into the first locking portion, and the other coil spring is fitted into the second locking portion, so that the coil spring can be brought into contact with the annular member with the coil spring positioned by the first locking portion and the second locking portion.

[0012] A fourth aspect of the vibration reduction device is a vibration reduction device according to any one of the first to third aspects, wherein the shaft member and the plurality of annular members are formed using a metal material, and the collar member is formed using a resin material.

[0013] According to the vibration reduction device of the fourth aspect, a collar member made of a resin material is interposed between the shaft member made of a metal material and the multiple ring members made of a metal material, which makes it possible to eliminate the need for surface treatment of the shaft member and the ring members in consideration of contact between the shaft member and the ring members.

[0014] The vehicle seat of the fifth aspect comprises a seat cushion that supports the buttocks of a seated occupant, a seat back that supports the back of the seated occupant, and a vibration reduction device of any one of the first to fourth aspects provided on at least one of the seat cushion and the seat back.

[0015] In a vibration reduction device constituting a part of a vehicle seat of a fifth aspect, the cylindrical portions of the collar members are inserted into the plurality of annular members. This allows the plurality of annular members to be maintained in an aligned state. Also, the shaft member is inserted into the collar member. This allows the plurality of annular members to be supported on the shaft member via the collar members, and allows the plurality of annular members to be supported movably along the shaft member. Effect of the Invention

[0016] The vibration reduction device and vehicle seat according to the present invention have the excellent effect of being able to support a plurality of annular members movably along the shaft member. [Brief description of the drawings]

[0017] [Figure 1] 1 is a side view showing a vehicle seat equipped with a vibration reduction device of the present embodiment. [Diagram 2] 1 is a perspective view showing a vibration reduction device according to an embodiment of the present invention; [Diagram 3] 1 is an exploded perspective view showing a vibration reduction device according to an embodiment of the present invention; [Figure 4] 1 is a cross-sectional view showing a cross section of a vibration reduction device of the present embodiment taken along the axial direction of a shaft member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] A vehicle seat 12 equipped with a vibration reduction device 10 of the present embodiment will be described with reference to Figs. 1 to 4.

[0019] 1 shows a side view of a vehicle seat 12 equipped with a vibration reduction device 10 of this embodiment, as viewed from the left side of the seat. In the figure, the arrow FR indicates the front side of the seat, the arrow UP indicates the upper side of the seat, the arrow RH indicates the right side in the width direction of the seat, and the arrow LH indicates the left side in the width direction of the seat. In the following description, when the directions of front-rear, up-down, and left-right are used unless otherwise specified, they refer to front-rear in the front-rear direction of the seat, up-down in the up-down direction of the seat, and left-right in the width direction of the seat.

[0020] As shown in Fig. 1, the vehicle seat 12 includes a seat cushion 14 that supports the buttocks of a seated occupant from below, a seat back 16 that supports the back of the seated occupant from the rear side of the seat, and a headrest 18 that supports the head of the seated occupant from the rear side of the seat. The seat back 16 is attached to the rear end of the seat cushion 14 and can be tilted in the front-rear direction. The headrest 18 is attached to the upper end of the seat back 16. The vibration reduction device 10 is provided inside an upper portion of the seat back 16 and is fixed to a seat back frame that forms the framework of the seat back 16. The vibration reduction device 10 may be provided in either the seat cushion 14 or the seat back 16, or may be provided in both the seat cushion 14 and the seat back 16.

[0021] 2 and 3, the vibration reduction device 10 includes an axis member 20 fixed to the seat back frame, a plurality of annular members 22 supported by the axis member 20, and a collar member 24 attached to the plurality of annular members 22. The vibration reduction device 10 also includes a pair of coil springs 26 provided on both sides of the plurality of annular members 22.

[0022] As shown in FIG. 3, the shaft member 20 is a stepped bolt made of a metal material, and includes a bolt shank 28, a threaded portion 30, and a bolt head 32. The bolt shank 28 is formed in a cylindrical shape and constitutes an axial intermediate portion of the shaft member 20. The threaded portion 30 constitutes an end portion on one axial side of the shaft member 20. A male thread is formed on the outer periphery of the threaded portion 30. The outer diameter D2 of the threaded portion 30 is set to be smaller than the outer diameter D1 of the bolt shank 28. As a result, a step portion 34 is formed at the boundary between the threaded portion 30 and the bolt shank 28. The bolt head 32 constitutes an end portion on the other axial side of the shaft member 20. The outer diameter D3 of the bolt head 32 is set to be larger than the outer diameter D1 of the bolt shank 28. A tool engagement portion 36 is formed on the opposite side of the bolt shank 28 in the bolt head 32 to the bolt shank 28. A tool engagement portion 36 is formed to engage with a tool such as a hexagonal wrench. The arrow Z direction, the arrow R direction, and the arrow C direction appropriately shown in the drawings respectively indicate one axial side, the radially outer side, and one circumferential side of the shaft member 20. Furthermore, hereinafter, when the axial direction, radial direction, and circumferential direction are simply indicated, they refer to the axial direction, radial direction, and circumferential direction of the shaft member 20 unless otherwise specified.

[0023] The multiple annular members 22 are washers formed by stamping using a metal material, and are formed in a disk shape with the axial direction as the thickness direction. A circular opening 38 is formed in the radial center of the multiple annular members 22. The inner diameter D4 of the opening 38 is set to be larger than the outer diameter D1 of the bolt shank 28 and smaller than the outer diameter D3 of the bolt head 32. The outer diameter D5 of the annular member 22 is set to be larger than the outer diameter D3 of the bolt head 32. The multiple annular members 22 are arranged in the axial direction in a state where they are stacked in the axial direction. The number and size of the multiple annular members 22 (the mass of the multiple annular members 22) may be appropriately set in consideration of the frequency at which vibration is to be reduced, etc.

[0024] The collar member 24 is formed using a resin material. As shown in FIG. 3 and FIG. 4, the collar member 24 includes a cylindrical portion 40 formed in a cylindrical shape. The inner diameter D6 of the cylindrical portion 40 is set to be slightly larger than the outer diameter D1 of the bolt shank 28. As a result, the bolt shank 28 is inserted into the inside of the cylindrical portion 40 with a clearance. The outer diameter D7 of the cylindrical portion 40 is set to be approximately the same as or slightly smaller than the inner diameter D4 of the openings 38 of the multiple annular members 22. As a result, the cylindrical portion 40 is inserted into the openings 38 of the multiple annular members 22 with a light press fit or with a clearance. The axial length dimension L1 of the cylindrical portion 40 is set to be approximately the same as the axial dimension L2 of the multiple annular members 22 stacked in the axial direction.

[0025] The collar member 24 also includes a first locking portion 42 that protrudes radially outward from an end portion on one axial side of the cylindrical portion 40. The outer diameter D8 of the portion of the collar member 24 that corresponds to the first locking portion 42 is set to an outer diameter larger than the inner diameter D4 of the opening 38 of the annular member 22. The collar member 24 also includes a second locking portion 44 that protrudes radially outward from an end portion on the other axial side of the cylindrical portion 40. The maximum value of the outer diameter D9 of the portion of the collar member 24 that corresponds to the second locking portion 44 is set to an outer diameter larger than the inner diameter D4 of the opening 38 of the annular member 22. The outer diameter of the second locking portion 44 is gradually smaller toward the other axial side. As a result, the shape of the second locking portion 44 is gradually narrowed toward the other axial side.

[0026] Further, the collar member 24 is formed with a plurality of slits 46 which circumferentially divide the portion 40A on the other axial side of the cylindrical portion 40 and the second locking portion 44. The plurality of slits 46 are arranged at equal intervals in the circumferential direction. This allows the portion 40A on the other axial side of the cylindrical portion 40 to bend and deform radially inward, thereby allowing the second locking portion 44 to be displaced radially inward. In other words, it is possible to reduce the outer diameter of the portion of the collar member 24 corresponding to the second locking portion 44.

[0027] Then, when the insertion of the multiple annular members 22 into the openings 38 of the tubular portion 40 of the collar member 24 is completed, the multiple annular members 22 are disposed between the first locking portion 42 and the second locking portion 44. This maintains the multiple annular members 22 in a state where they are stacked in the axial direction and arranged side by side in the axial direction.

[0028] The pair of coil springs 26 are compression coil springs set to the same dimensions and spring constants. The coil spring 26 arranged on one axial side of the plurality of annular members 22 abuts against the annular member 22 in a centered state by fitting into a first locking portion 42. The coil spring 26 arranged on the other axial side of the plurality of annular members 22 abuts against the annular member 22 in a centered state by fitting into a second locking portion 44. Centering means that the coil spring 26 is moved toward the axial center of the shaft member 20 so that the axial center of the coil spring 26 and the axial center of the shaft member 20 approach each other.

[0029] The coil spring 26 arranged on one axial side of the plurality of annular members 22 is compressed in the axial direction between a temporary washer 48 fixed to the shaft member 20 in a state of contact with the step portion 34 and the plurality of annular members 22. The temporary washer 48 is a member used for distributing the vibration reduction device 10 as an assembly before it is attached to the vehicle seat 12. With the threaded portion 30 of the shaft member 20 inserted into the temporary washer 48, the nut 50 is screwed into the threaded portion 30, thereby fixing the temporary washer 48 to the shaft member 20. When the vibration reduction device 10 is attached to the vehicle seat 12, the temporary washer 48 is removed, and a portion of the seat back frame is placed in the portion corresponding to the temporary washer 48.

[0030] The coil spring 26 , which is disposed on one axial side of the plurality of annular members 22 , is compressed in the axial direction between the bolt head 32 and the plurality of annular members 22 .

[0031] (Actions and Effects of the Present Embodiment) Next, the operation and effects of this embodiment will be described.

[0032] As shown in Figs. 2 to 4, in the vibration reduction device 10 of this embodiment, the cylindrical portion 40 of the collar member 24 is inserted into the multiple annular members 22. The multiple annular members 22 are disposed between the first locking portion 42 and the second locking portion 44 of the collar member 24. This maintains the multiple annular members 22 stacked in the axial direction and arranged side by side in the axial direction. The bolt shaft portion 28 of the shaft member 20 is inserted into the cylindrical portion 40 of the collar member 24. This allows the multiple annular members 22 to be supported by the shaft member 20 via the collar member 24, and allows the multiple annular members 22 to be supported movably along the shaft member. Then, as shown in Figs. 1 to 4, when the vehicle seat 12 equipped with the vibration reduction device 10 of this embodiment described above vibrates in the axial direction of the shaft member 20, the multiple annular members 22 move along the shaft member 20 together with the collar member 24. This suppresses resonance of the vehicle seat 12.

[0033] 2 to 4, in the vibration reduction device 10 of this embodiment, the second locking portions 44 of the collar member 24 can be inserted into the openings 38 of the multiple annular members 22 by displacing the second locking portions 44 of the collar member 24 radially inward. That is, the collar member 24 can be attached to the multiple annular members 22 by inserting the tubular portions 40 of the collar member 24 from the second locking portion 44 side into the openings 38 of the multiple annular members 22. In this way, in this embodiment, the collar member 24 can be easily attached to the multiple annular members 22.

[0034] In addition, in the vibration reduction device 10 of this embodiment, a collar member 24 made of a resin material is interposed between the shaft member 20 made of a metal material and the multiple annular members 22 made of a metal material. This makes it possible to eliminate the need to perform a surface treatment on the shaft member 20 and the annular member 22 in consideration of the contact between the shaft member 20 and the annular member 22. In addition, the multiple annular members 22 are washers formed by punching using a metal material. This allows the cost of the weight (multiple annular members 22) to be reduced compared to a configuration using a single weight with a mass corresponding to the multiple annular members 22.

[0035] Furthermore, in the vibration reduction device 10 of this embodiment, one coil spring 26 is fitted into the first locking portion 42 of the collar member 24, and the other coil spring 26 is fitted into the second locking portion 44 of the collar member 24. This allows the coil spring 26 to be brought into contact with the annular member 22 with the coil spring 26 positioned (centered) by the first locking portion 42 and the second locking portion 44.

[0036] In the present embodiment, the coil spring 26 is positioned (centered) by the first locking portion 42 and the second locking portion 44, but the present invention is not limited to this. For example, the coil spring 26 may be positioned by providing a groove in the annular member 22 into which a part of the coil spring 26 fits.

[0037] In addition, in the present embodiment, an example has been described in which the shaft member 20 and the multiple annular members 22 are made of metal and the collar member 24 is made of resin, but the present invention is not limited to this. The material of each part may be appropriately selected in consideration of the required strength, etc.

[0038] In addition, in the present embodiment, an example has been described in which the multiple annular members 22 are arranged between the first locking portion 42 and the second locking portion 44 of the collar member 24 to maintain the multiple annular members 22 aligned in the axial direction, but the present invention is not limited to this. For example, the multiple annular members 22 may be maintained aligned in the axial direction only by a configuration in which the cylindrical portion 40 of the collar member 24 is press-fitted into the openings 38 of the multiple annular members 22.

[0039] Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is of course possible to implement the present invention in various other modified forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0040] 10 Vibration reduction device 12 Vehicle seats 14 Seat cushion 16 Seat back 20 Shaft member 22 Annular member 24 Colored parts 26 Coil spring 40 Cylindrical part 42 First locking portion 44 Second locking part

Claims

1. A shaft member; A plurality of annular members formed in an annular shape and arranged in an axial direction of the shaft member; a collar member having a cylindrical portion formed in a cylindrical shape, the collar member holding the plurality of annular members arranged in a state in which the cylindrical portion is inserted into the plurality of annular members, and the collar member moving in an axial direction of the shaft member together with the plurality of annular members in a state in which the shaft member is inserted into the cylindrical portion; A vibration reduction device comprising:

2. the collar member includes a first locking portion protruding radially outward from an end portion of the cylindrical portion on one axial side of the shaft member, and a second locking portion protruding radially outward from an end portion of the cylindrical portion on the other axial side of the shaft member and displaceable radially inward, The vibration reduction device according to claim 1 , wherein the plurality of annular members are disposed between the first engaging portion and the second engaging portion in a state in which the tubular portion is inserted into the plurality of annular members.

3. A coil spring is provided on one axial side and the other axial side of the shaft member with respect to the plurality of annular members, the coil spring disposed on one axial side of the shaft member with respect to the plurality of annular members is in contact with the annular member while being fitted into the first engaging portion, The vibration reduction device according to claim 2 , wherein the coil spring arranged on the other axial side of the shaft member with respect to the plurality of annular members abuts against the annular member while being fitted into the second engaging portion.

4. the shaft member and the plurality of annular members are formed using a metal material, 4. The vibration reduction device according to claim 1, wherein the collar member is made of a resin material.

5. a seat cushion that supports the buttocks of a seated occupant; A seat back that supports the back of a seated occupant; The vibration reduction device according to any one of claims 1 to 4, which is provided on at least one of the seat cushion and the seat back; A vehicle seat comprising:

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