Vehicle seats

Abstract

To provide a vehicular seat which can achieve load input restriction performance and vibration inhibition performance.SOLUTION: One embodiment of the disclosure relates to a vehicular seat including a cushion frame. The cushion frame has: a first member; a second member; and a connection structure which connects the first member with the second member. The connection structure has: a bolt inserted into the first member and the second member; a nut which is threadedly engaged with the bolt; auxiliary members which are arranged so as to sandwich the first member with the second member in an axial direction of the bolt; first elastic bodies which are disposed between the first member and the second member in the axial direction of the bolt and contact with the first member and the second member; and second elastic bodies which are disposed between the first member and the auxiliary member in the axial direction of the bolt and contact with the first member and the auxiliary member.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to vehicle seats. [Background technology]

[0002] In a cushion frame of a vehicle seat, a connecting structure using bolts and nuts is used to connect two members (see Patent Document 1). In this connecting structure, an elastic body such as rubber is placed between the connected members to suppress the transmission of vibrations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6035354 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned connecting structure includes a first elastic body sandwiched between the two members to be connected and a second elastic body pressed against one of the members by a washer. Of these elastic bodies, the first elastic body restricts the input of a large load.

[0005] However, in addition to restricting the input of load (i.e., absorbing the load by deformation), the first elastic body also suppresses vibration together with the second elastic body. The load input restriction performance and vibration suppression performance of an elastic body are contradictory. Therefore, the first elastic body in the above-mentioned connecting structure cannot sufficiently restrict the input of load when the seat belt and belt anchor are pulled toward the front of the seat due to a collision load, etc., and there is a risk that the seat will lift up.

[0006] An object of one aspect of the present disclosure is to provide a vehicle seat that can achieve both load input restriction performance and vibration suppression performance. [Means for solving the problem]

[0007] One aspect of the present disclosure is a vehicle seat (1) including a seat cushion (2), a seat back (3), a cushion frame (4) that supports the seat cushion (2), a seat belt (6), and a belt anchor (7) that extends the seat belt (6) from inside the seat back (3). The cushion frame (4) has a first member (41), a second member (42), and a connecting structure (46) that connects the first member (41) and the second member (42).

[0008] The connecting structure (46) has a bolt (461) inserted through the first member (41) and the second member (42), a nut (462) threaded onto the bolt (461), an auxiliary member (463) arranged to sandwich the first member (41) together with the second member (42) in the axial direction of the bolt (461), a first elastic body (464) arranged between the first member (41) and the second member (42) in the axial direction of the bolt (461) and in contact with the first member (41) and the second member (42), and a second elastic body (465) arranged between the first member (41) and the auxiliary member (463) in the axial direction of the bolt (461) and in contact with the first member (41) and the auxiliary member (463).

[0009] With this configuration, the first elastic body (464) can have a vibration suppression function, while the second elastic body (465) can have a load input restriction function. In this way, by having two elastic bodies each perform two functions, the coupling structure (46) can achieve both load input restriction performance and vibration suppression performance.

[0010] In one aspect of the present disclosure, the spring constant of the second elastic body 465 may be greater than the spring constant of the first elastic body 464. This configuration can improve the load input restriction performance and vibration suppression performance of the connecting structure 46.

[0011] In one aspect of the present disclosure, the first elastic body (464) and the second elastic body (465) may each have a cylindrical or annular shape through which the bolt (461) is inserted. This configuration can prevent foreign matter from entering the connecting structure (46) through gaps between the first elastic body (464) and the second elastic body (465).

[0012] In one aspect of the present disclosure, the second member (42) may have a collar (422) that penetrates the first member (41) and through which the bolt (461) is inserted. The connecting structure (46) may have a third elastic body (466) that is sandwiched between the collar (422) and the first member (41) in the radial direction of the bolt (461). With this configuration, the third elastic body (466) can improve vibration suppression performance in the radial direction of the bolt (461).

[0013] In one aspect of the present disclosure, the connecting structure (46) may include an elastic member (467) that is an integral unit of the first elastic body (464) and the third elastic body (466). Such a configuration can improve vibration suppression performance and reduce the number of parts.

[0014] In one aspect of the present disclosure, the first member (41) may have a tubular portion (412) through which the bolt (461) is inserted. The second elastic body (465) may have a base portion (465A) that contacts an axial end of the tubular portion (412), and a guide portion (465B) that protrudes from the base portion (465A) in the axial direction of the tubular portion (412) and surrounds the tubular portion (412) from the radially outer side. This configuration facilitates positioning of the first member (41) and the auxiliary member (463) when the first member (41) and the second member (42) are connected.

[0015] Note that the symbols in the parentheses above are examples showing the correspondence with the specific configurations, etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations, etc. shown by the symbols in the parentheses above. [Brief explanation of the drawings]

[0016] [Figure 1]FIG. 1 is a schematic perspective view showing a vehicle seat according to an embodiment. [Figure 2] FIG. 2 is a schematic perspective view of the cushion frame of FIG. [Figure 3] FIG. 3 is a schematic side view showing a part of the cushion frame of FIG. [Figure 4] FIG. 4 is a schematic exploded perspective view of the first connecting structure and the second connecting structure of FIG. [Figure 5] FIG. 5 is a schematic cross-sectional end view taken along line VV in FIG. [Figure 6] 6A is a schematic perspective view of the second elastic body of FIG. 4, and FIG. 6B is a schematic perspective view of the elastic member of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First embodiment] [1-1.Configuration] The vehicle seat 1 shown in FIG. 1 includes a seat cushion 2, a seat back 3, a cushion frame 4, a back frame 5, a seat belt 6, a belt anchor 7, and a retractor 8.

[0018] The vehicle seat 1 is used as a seat for a passenger vehicle. Note that the directions in the following description and in each drawing refer to directions when the vehicle seat 1 is assembled to the vehicle (i.e., the passenger vehicle). In this embodiment, the width direction of the seat coincides with the left-right direction of the vehicle, and the front of the seat coincides with the front of the vehicle.

[0019] The seat cushion 2 is a portion for supporting the buttocks of a seated person. The seat back 3 is a portion for supporting the back of a seated person. The cushion frame 4 supports the seat cushion 2. The back frame 5 supports the seat back 3.

[0020] The seat belt 6 is worn by the seat occupant by being stretched from one shoulder of the seat back 3 (the right shoulder in this embodiment) across the seat back 3 in the seat width direction to the seat width direction end of the seat cushion 2 (the left end in this embodiment).

[0021] The belt anchor 7 is a guide that pulls the seat belt 6 out from the inside of the seat back 3 and pulls the seat belt 6 back into the inside of the seat back 3. The belt anchor 7 is attached to the back frame 5.

[0022] The retractor 8 is a device that retracts the seat belt 6. The retractor 8 is held by the back frame 5 inside the seat back 3. The seat belt 6 is stretched between the retractor 8 and a belt anchor 7 inside the seat back 3.

[0023] <Cushion frame> As shown in FIG. 2, the cushion frame 4 includes a first side frame 41, a leg 42, a second side frame 43, and a plurality of connecting rods 44A, 44B, and 44C.

[0024] The first side frame 41 and the second side frame 43 each extend in the front-rear direction and are spaced apart from each other in the seat width direction. The leg 42 is connected to a lower end of the first side frame 41. A plurality of connecting rods 44A, 44B, and 44C each connect the first side frame 41 and the second side frame 43 in the seat width direction.

[0025] As shown in FIG. 3, the first side frame 41 and the leg 42 are connected in the vertical direction by a first connecting structure 46 and a second connecting structure 47.

[0026] 4, the first side frame 41 has a side panel 411, a first tubular portion 412, and a second tubular portion 413. The first tubular portion 412 and the second tubular portion 413 are joined, for example, by welding, to a bottom wall 411A of the side panel 411 that extends in the seat front-rear direction (i.e., has a plate surface that intersects with the up-down direction).

[0027] The first cylindrical portion 412 and the second cylindrical portion 413 penetrate the bottom wall 411A in the thickness direction. A bolt 461 is inserted into each of the first cylindrical portion 412 and the second cylindrical portion 413.

[0028] The leg 42 has a leg panel 421, a first collar 422, and a second collar 423. The leg panel 421 has a first opening 421A and a second opening 421B through which the bolt 461 is inserted.

[0029] The first collar 422 is a cylindrical member arranged such that its hollow portion communicates with the first opening 421A. The first collar 422 has a disk-shaped flange 422A that contacts the leg panel 421, and a cylindrical main body 422B that extends upward from the flange 422A (i.e., toward the first side frame 41).

[0030] The main body 422B of the first collar 422 is inserted into the first cylindrical portion 412. In other words, the first collar 422 penetrates the first side frame 41. The upper end portion of the main body 422B in the axial direction is located higher than the upper end portion of the first cylindrical portion 412 in the axial direction.

[0031] Second collar 423 is a cylindrical member arranged such that its hollow portion communicates with second opening 421 B. Second collar 423 has flange 423A similar to first collar 422 and main body 423B.

[0032] The main body 423B of the second collar 423 is inserted into the second cylindrical portion 413. In other words, the second collar 423 penetrates the first side frame 41. The upper end portion of the main body 423B in the axial direction is located higher than the upper end portion of the second cylindrical portion 413 in the axial direction.

[0033] A bolt 461 is inserted through each of the first collar 422 and the second collar 423. Furthermore, the first collar 422 and the second collar 423 are not directly fixed to the leg panel 421.

[0034] <Connection structure> The first connecting structure 46 has a bolt 461, a nut 462, an auxiliary member 463, a first elastic body 464, a second elastic body 465, and a third elastic body 466. The first elastic body 464 and the third elastic body 466 configure an elastic member 467.

[0035] The bolt 461 is inserted through the first side frame 41 and the leg 42. In detail, the bolt 461 is inserted through the leg panel 421, the first collar 422, the elastic member 467, the second elastic body 465, the auxiliary member 463, and the nut 462.

[0036] The head of the bolt 461 is located on the opposite side of the leg 42 from the first side frame 41 (i.e., below the leg 42). The bolt 461 is inserted from the leg 42 side when assembling the cushion frame 4. In this embodiment, the head of the bolt 461 is in contact with the leg panel 421.

[0037] The nut 462 is threadedly engaged with the bolt 461. The nut 462 is disposed at a position where the nut 462 and the leg 42 sandwich the first side frame 41 in the axial direction of the bolt 461 (i.e., above the first side frame 41). In this embodiment, the nut 462 contacts the auxiliary member 463.

[0038] Auxiliary member 463 is a disk-shaped member having an opening at the center through which bolt 461 is inserted. The inner diameter of auxiliary member 463 is smaller than the inner diameter of main body 422B of first collar 422. The outer diameter of auxiliary member 463 is larger than the outer diameter of second elastic body 465.

[0039] The auxiliary member 463 supports the first side frame 41 in the axial direction of the bolt 461. , via the bolt 461 and nut 462 Leg 42 and Working togetherIt is arranged to sandwich (See Figure 5) . Specifically, the first cylindrical portion 412 of the first side frame 41 is disposed between the auxiliary member 463 and the leg 42 in the axial direction of the bolt 461. The upper end portion of the main body 422B of the first collar 422 in the axial direction is in contact with the lower surface of the auxiliary member 463.

[0040] The first elastic body 464 is a cylindrical member through which the bolt 461 is inserted. The first elastic body 464 is made of, for example, rubber. As shown in Fig. 5 , the first elastic body 464 is disposed between the first side frame 41 (i.e., the first cylindrical portion 412) and the leg 42 in the axial direction of the bolt 461, and is in contact with the first side frame 41 (i.e., the first cylindrical portion 412) and the leg 42.

[0041] By fastening the bolt 461 and the nut 462, the first elastic body 464 is compressed in the axial direction of the bolt 461 by the flange portion 422A of the first collar 422 and the axial lower end portion of the first cylindrical portion 412. The first elastic body 464 is provided over the entire circumferential direction of the bolt 461.

[0042] The second elastic body 465 is a ring-shaped member through which the bolt 461 is inserted. The second elastic body 465 is made of a material such as rubber. The second elastic body 465 is disposed between the first side frame 41 and the auxiliary member 463 in the axial direction of the bolt 461, and is in contact with the first side frame 41 and the auxiliary member 463. The second elastic body 465 is fixed to the lower surface of the auxiliary member 463 by, for example, adhesive.

[0043] 6A, second elastic body 465 has base portion 465A and guide portion 465B. Base portion 465A is compressed in the axial direction of bolt 461 by the upper end portion of first cylindrical portion 412 in the axial direction and the lower surface of auxiliary member 463 due to fastening of bolt 461 and nut 462.

[0044] Guide portion 465B protrudes from base portion 465A in the axial direction of first cylindrical portion 412 and surrounds the radially outer side of first cylindrical portion 412. Specifically, guide portion 465B is a cylindrical portion protruding downward from the lower surface of base portion 465A.

[0045] 5, the outer peripheral surface of first cylindrical portion 412 contacts the inner peripheral surface of guide portion 465B. In other words, first cylindrical portion 412 is inserted into guide portion 465B. Base portion 465A and guide portion 465B are each provided over the entire circumferential direction of bolt 461.

[0046] The first cylindrical portion 412 is sandwiched between the first elastic body 464 and the second elastic body 465 in the axial direction of the bolt 461. Therefore, there is no gap between the auxiliary member 463 and the first collar 422 that communicates with the interior of the first cylindrical portion 412. In other words, the internal space of the first cylindrical portion 412 is sealed by the auxiliary member 463, the second elastic body 465, the first elastic body 464, and the first collar 422.

[0047] The spring constant of the second elastic body 465 is greater than the spring constant of the first elastic body 464 (i.e., the elastic member 467). In other words, the second elastic body 465 is harder and less likely to deform than the first elastic body 464. Therefore, the second elastic body 465 has a greater ability to restrict the input of load than the first elastic body 464. In addition, the second elastic body 465 also exerts an effect of suppressing abnormal noise caused by vibrations in the first connecting structure 46.

[0048] The third elastic body 466 is a cylindrical member through which the bolt 461 is inserted. The third elastic body 466 is formed integrally with the first elastic body 464. In other words, the first connecting structure 46 has an elastic member 467 in which the first elastic body 464 and the third elastic body 466 are integrated.

[0049] The lower end of the third elastic body 466 in the axial direction is connected to the first elastic body 464 in the radial direction of the bolt 461. The elastic member 467 is fixed to the first collar 422 by, for example, adhesive.

[0050] The third elastic body 466 is sandwiched between the first collar 422 and the first side frame 41 (i.e., the first tubular portion 412) in the radial direction of the bolt 461. Specifically, the inner circumferential surface of the third elastic body 466 is in contact with the outer circumferential surface of the main body 422B of the first collar 422, and the outer circumferential surface of the third elastic body 466 is in contact with the inner circumferential surface of the first tubular portion 412.

[0051] The upper end portion of the third elastic body 466 in the axial direction is located higher than the upper end portion of the first elastic body 464. In other words, the axial length of the third elastic body 466 is greater than the axial length of the first elastic body 464. In addition, the upper end portion of the third elastic body 466 in the axial direction is separated from the auxiliary member 463.

[0052] 6B, the third elastic body 466 has a holding portion 466A and a plurality of protrusions 466B. The holding portion 466A is a cylindrical portion. The outer peripheral surface of the holding portion 466A does not contact the first cylindrical portion 412.

[0053] The multiple protrusions 466B are arranged at regular intervals in the circumferential direction of the holding portion 466A. The protrusions 466B are portions that protrude radially outward from the outer circumferential surface of the holding portion 466A. The protrusions 466B are compressed radially of the holding portion 466A by the first collar 422 and the first cylindrical portion 412.

[0054] The second connecting structure 47 shown in FIG. 4 has a bolt 461, a nut 462, an auxiliary member 463, an elastic member 467 (i.e., a first elastic body 464 and a third elastic body 466), and a second elastic body 465, similar to the first connecting structure 46.

[0055] The second connecting structure 47 connects the first side frame 41 and the leg 42 in the up-down direction, further forward of the seat than the first connecting structure 46. The axial direction of the bolt 461 in the second connecting structure 47 is the same as that of the first connecting structure 46. Furthermore, other configurations are also the same as those of the first connecting structure 46, and therefore description thereof will be omitted.

[0056] [1-2.Effects] According to the embodiment described above in detail, the following effects can be obtained. (1a) The first elastic body 464 can be provided with a vibration suppression function, while the second elastic body 465 can be provided with a load input restriction function. In this way, by having two elastic bodies each perform two functions, it is possible to achieve both the load input restriction performance and the vibration suppression performance in the connecting structures 46, 47.

[0057] (1b) The spring constant of the second elastic body 465 is greater than the spring constant of the first elastic body 464, so that the load input restriction performance and vibration suppression performance of the connecting structures 46, 47 can be improved.

[0058] (1c) Since the first elastic body 464 and the second elastic body 465 are each cylindrical or annular, it is possible to prevent foreign matter from entering the inside of the connecting structures 46, 47 through the gaps between the first elastic body 464 and the second elastic body 465.

[0059] (1d) The third elastic body 466 can improve the vibration suppression performance in the radial direction of the bolt 461. (1e) By integrating the first elastic body 464 and the third elastic body 466 as the elastic member 467, it is possible to improve vibration suppression performance and reduce the number of parts.

[0060] (1f) The second elastic body 465 has the guide portion 465B, which makes it easy to position the first side frame 41 and the auxiliary member 463 when the first side frame 41 and the leg 42 are connected to each other.

[0061] 2. Other Embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take on various forms.

[0062] (2a) In the vehicle seat of the above embodiment, the location of the connecting structure is not limited to the location described above. For example, the connecting structure may be provided on the second side frame. Note that, from the viewpoint of restricting the input of load when the belt anchor is pulled forward of the seat, it is preferable that the connecting structure be provided at a location away from the belt anchor (i.e., a location shifted from directly below the belt anchor).

[0063] Furthermore, the components connected by the connecting structure are not limited to the side frame and the leg. For example, the connecting structure may connect the side frame and the slide rail. Furthermore, the connecting direction in the connecting structure is not limited to the vertical direction, but may be a direction intersecting the vertical direction (for example, the horizontal direction).

[0064] (2b) In the vehicle seat of the above embodiment, the first elastic body and the second elastic body do not necessarily have to be cylindrical or annular. For example, the first elastic body and the second elastic body may have a notch in a part of their circumferential direction.

[0065] (2c) In the vehicle seat of the above embodiment, the third elastic body does not necessarily have to be integrated with the first elastic body, but may be a member independent of the first elastic body. Also, the connecting structure does not necessarily have to have the third elastic body.

[0066] (2d) In the vehicle seat of the above embodiment, the second elastic body does not necessarily have to have a guide portion. Therefore, the outer diameter of the second elastic body may be smaller than the outer diameter of the tubular portion of the first member (i.e., the first side frame).

[0067] (2e) In the vehicle seat of the above embodiment, the bolt may be inserted from the auxiliary member side during assembly of the cushion frame. The auxiliary member may be integrated with the nut or bolt. For example, an auxiliary member that contacts the second elastic body may be provided on the washer portion of the nut or the head of the bolt.

[0068] (2f) The vehicle seat of the above embodiment can also be applied to seats used in automobiles other than passenger cars, and seats used in vehicles other than automobiles, such as railway cars, ships, and aircraft.

[0069] (2g) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. All aspects included in the technical idea identified by the wording of the claims are embodiments of the present disclosure. [Explanation of symbols]

[0070] 1...vehicle seat, 2...seat cushion, 3...seat back, 4...Cushion frame, 5...Back frame, 6...Seat belt, 7...belt anchor, 8...retractor, 41...first side frame, 42...leg, 43... second side frame, 44A, 44B, 44C... connecting rods, 46...first connecting structure, 47...second connecting structure, 411...side panel, 411A...bottom wall, 412, 413...tubular portion, 421...leg panel, 421A, 421B...opening, 422, 423...Collar, 422A...Flange, 422B...Main body, 461...Bolt, 462...nut, 463...auxiliary member, 464...first elastic body, 465...second elastic body, 465A...base portion, 465B...guide portion, 466...third elastic body, 466A...holding portion, 466B...convex portion, 467...elastic member.

Claims

1. Seat cushion and Seat back and a cushion frame supporting the seat cushion; a back frame supporting the seat back and connected to the cushion frame; Seat belts and a belt anchor that extends from the seat back and is attached to the back frame; a retractor held by the back frame that retracts the seat belt; Equipped with The cushion frame is a first member including at least a first side frame extending in the front-rear direction; a second member including at least a leg connected to a lower end of the first side frame; a connecting structure that connects the first member and the second member; and The connecting structure is a bolt that is inserted through the first member and the second member and whose axial direction coincides with the vertical direction; a nut threaded onto the bolt; an auxiliary member arranged to sandwich the first member together with the second member via the nut and the bolt in the axial direction of the bolt; a first elastic body that is disposed between the first member and the second member in the axial direction of the bolt and that is in contact with the first member and the second member; a second elastic body that is disposed between the first member and the auxiliary member in the axial direction of the bolt and that is in contact with the first member and the auxiliary member, When the first member and the second member are displaced in a direction toward each other, the first elastic body is compressed and deformed, and when the first member and the second member are displaced in a direction away from each other, the second elastic body is compressed and deformed, Furthermore, the second member has a collar that penetrates the first member and through which the bolt is inserted, and the connecting structure has a third elastic body sandwiched between the collar and the first member in the radial direction of the bolt.

2. 2. The vehicle seat according to claim 1, A vehicle seat, wherein the spring constant of the second elastic body is greater than the spring constant of the first elastic body.

3. The vehicle seat according to claim 1 or 2, The vehicle seat, wherein the first elastic body and the second elastic body each have a cylindrical or annular shape through which the bolt is inserted.

4. A vehicle seat according to any one of claims 1 to 3, The vehicle seat, wherein the connecting structure has an elastic member in which the first elastic body and the third elastic body are integrated.

5. The vehicle seat according to any one of claims 1 to 4, the first member has a cylindrical portion through which the bolt is inserted, The second elastic body is a base portion that contacts an axial end portion of the cylindrical portion; a guide portion that protrudes from the base portion in the axial direction of the cylindrical portion and surrounds the cylindrical portion from the radially outer side; A vehicle seat having:

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