JP5581241B2 - Anti-vibration structure for vehicle seat - Google Patents

Description

  The present invention relates to a vibration isolating structure for a vehicle seat that is applied to a vehicle seat.

  Patent Document 1 below shows a knock sensor. In this knock sensor, the vibration mass body is disposed above the fixed body, and the vibration mass body is supported by a pair of disc springs. Since this vibrating mass is composed of a relatively small mass, a high load does not act on the disc spring.

  On the other hand, as shown in FIGS. 6 and 7, in the vibration isolating structure for a vehicle seat, a vibration isolating mechanism 302 is provided on a seat back frame 300 constituting the vehicle seat. The anti-vibration mechanism 302 includes a plate-shaped bracket 304, and a concave portion 306 is formed in the bracket 304. A weight 308 is accommodated in the recess 306, and the weight 308 is supported by the rubber elastic body 310. As a result, the weight of the seat back increases, and vibrations input to the vehicle seat are suppressed.

  Here, for example, if the anti-vibration structure that supports the components of the vehicle seat at the lower portion of the vehicle seat can improve the anti-vibration performance for the vehicle seat effectively, the supporting weight is heavy. Become. For this reason, when the component is supported by a rubber material used in the above-described vibration isolation mechanism 302, the mechanical strength of the rubber material is low, and therefore, such a strength cannot be applied to a portion where the strength is required. There is.

JP 2005-537491 A

  In view of the above facts, an object of the present invention is to provide a vibration isolating structure for a vehicle seat that can be applied to a portion requiring strength.

A vibration isolating structure for a vehicle seat according to claim 1 is provided between a first member and a second member constituting a vehicle seat, and a cylindrical input portion to which vibration of the first member is input. , said input portion than the diameter of the large cylindrical transmission portion as well as transmits the inputted vibration to the input portion to the second member, and the plate-like connecting portion for connecting the transmitting unit and the input unit, the And an elastic body made of metal, and provided between the first member and the second member, provided on the first member, and spaced apart from the second member, the second member And a blocking portion that blocks relative movement in the approaching direction between the first member and the second member .

  In the vibration isolating structure for a vehicle seat according to claim 1, an elastic body is provided between the first member and the second member constituting the vehicle seat, and vibration input from the first member to the elastic body. Is attenuated by the elastic body and transmitted to the second member.

Here, the elastic body is made of metal. Moreover, the elastic body has the input part and transmission part which were formed in the cylindrical shape, and the input part and the transmission part are connected by the plate-shaped connection part. Thereby, since an elastic body can be shape | molded from a plate-shaped metal, the mechanical strength of an elastic body can be made high.
Furthermore, in the vibration isolating structure for a vehicle seat according to claim 1, the first member is provided with a blocking portion. The blocking portion is disposed between the first member and the second member, and is separated from the second member. When the blocking portion abuts on the second member, relative movement in the approaching direction between the first member and the second member is blocked.
For this reason, the elastic body can be elastically deformed in the elastic deformation region by setting the gap between the blocking portion and the second member to be smaller than the bending amount of the elastic body that can be elastically deformed.

  The vehicle seat vibration-proof structure according to claim 2 is the vehicle seat vibration-proof structure according to claim 1, wherein the vehicle seat vibration-proof structure is provided on one of the first member and the second member. And a shaft portion configured to be relatively movable with respect to either one of the second members, and having a flange portion that restricts the relative movement in the separating direction between the first member and the second member. Yes.

  In the vibration isolating structure for a vehicle seat according to claim 2, a shaft portion is provided on one of the first member and the second member, and the shaft portion is provided on either one of the first member and the second member. On the other hand, it is configured to be relatively movable.

  Here, the shaft portion has a flange portion, and the relative movement in the separating direction between the first member and the second member is restricted by the flange portion. Thereby, since the maximum distance in the separation direction between the first member and the second member can be set, the elastic body can always be brought into contact with the first member and the second member.

  The vehicle seat vibration-proof structure according to claim 3 is the vehicle seat vibration-proof structure according to claim 2, wherein the vehicle seat vibration-proof structure is formed on one of the first member and the second member and the shaft portion. Is inserted, and an insertion hole for restricting the movement of the shaft portion in a direction orthogonal to the axial direction of the elastic body is provided.

  In the vibration isolating structure for a vehicle seat according to claim 3, an insertion hole through which the shaft portion is inserted is formed in one of the first member and the second member, and is orthogonal to the axial direction of the elastic body. The movement of the shaft portion is limited by the insertion hole in the direction to be performed.

  Accordingly, relative movement between the first member and the second member is suppressed in a direction orthogonal to the axial direction of the elastic body. For this reason, relative movement between the elastic body, the first member, and the second member is suppressed, and generation of sliding friction between the elastic body, the first member, and the second member can be suppressed.

  The vehicle seat vibration-proof structure according to claim 4 is the vehicle seat vibration-proof structure according to claim 3, wherein the vehicle seat vibration-proof structure is provided in an inner peripheral portion of the insertion hole, and the shaft portion is arranged in the axial direction of the shaft portion. A bush is slidably contacted.

  In the vibration isolating structure for a vehicle seat according to the fourth aspect, the bush is provided in the inner peripheral portion of the insertion hole, and the bush is slidably contacted with the shaft portion in the axial direction of the shaft portion. For this reason, since the shaft part and the other one of the first member and the second member are not in direct sliding contact, the first member can smoothly move relative to the second member.

  The vibration isolating structure for a vehicle seat according to claim 5 is the vibration isolating structure for a vehicle seat according to claim 3 or 4, wherein either one of the first member and the second member is the flange portion. It arrange | positions between any one of the said 1st member and the said 2nd member. For this reason, after inserting a shaft part into an insertion hole, a collar part can be assembled to a shaft part.

  The vehicle seat vibration isolation structure according to claim 6 is the vehicle seat vibration isolation structure according to any one of claims 2 to 5, wherein the shaft portion is inserted in the elastic body. Has been. For this reason, the position of the elastic body can be set by the shaft portion, and the relative movement between the elastic body and any one of the first member and the second member can be suppressed.

The vehicle seat vibration-proof structure according to claim 7 is the vehicle seat vibration-proof structure according to any one of claims 1 to 6 , wherein the first member is directly on the floor of the vehicle or It is attached indirectly and the second member supports the seat cushion of the seat.

In the vibration isolating structure for a vehicle seat according to claim 7 , the elastic body is provided between the first member attached directly or indirectly to the floor portion of the vehicle and the second member supporting the seat cushion. For this reason, the vibration input from the floor of the vehicle can be attenuated by the elastic body and transmitted to the seat cushion.

The vehicle seat vibration-proof structure according to claim 8 is the vehicle seat vibration-proof structure according to any one of claims 1 to 6 , wherein the first member is indirectly attached to a floor portion of the vehicle. It is attached and the second member supports the seat back of the seat.

In the vibration isolating structure for a vehicle seat according to claim 8 , the elastic body is provided between the first member that is indirectly attached to the floor of the vehicle and the second member that supports the seat back. For this reason, the vibration input from the floor of the vehicle can be attenuated by the elastic body and transmitted to the seat back.

According to the vibration isolating structure for a vehicle seat according to claim 1, it can be applied to a portion where strength is required. Furthermore, it is possible to suppress the elastic body from being plastically deformed.

  According to the vibration isolating structure for a vehicle seat according to the second aspect, the vibration of the first member can always be transmitted to the second member via the elastic body.

  According to the vibration isolating structure for a vehicle seat according to claim 3, the vibration of the elastic body due to the sliding friction between the elastic body and the first member and the second member in a direction orthogonal to the axial direction of the elastic body. Deterioration of characteristics can be suppressed.

  According to the vibration isolating structure for a vehicle seat of the fourth aspect, it is possible to suppress the deterioration of the vibration characteristics due to the shaft portion being inserted through the insertion hole.

  According to the vibration isolating structure for a vehicle seat according to the fifth aspect, the assembling property can be improved.

  According to the vibration isolating structure for a vehicle seat according to the sixth aspect, the assembling property can be further improved, and the deterioration of the vibration characteristics of the elastic body can be further suppressed.

According to the vehicle seat vibration-proof structure of the seventh aspect , the vibration-proof performance of the seat can be effectively improved.

According to the vibration isolating structure for a vehicle seat according to claim 8 , it is possible to effectively improve the vibration isolating performance of the seat.

It is the perspective view seen from the vehicle left front which shows the composition of the vehicle seat to which the vibration isolating structure for vehicle seats concerning a 1st embodiment of the present invention was applied. FIG. 2 is a partially cutaway side view showing a part of the configuration of the vehicle seat shown in FIG. 1 as viewed from the left side of the vehicle. FIG. 2 is a partially broken cross-sectional view of the vibration isolating mechanism used in the vehicle seat anti-vibration structure shown in FIG. 1 as viewed from the left side of the vehicle. It is the side view seen from the vehicle left side which shows a part of structure of the vehicle seat to which the vibration isolating structure for vehicle seats concerning the 2nd Embodiment of this invention was applied. FIG. 6 is a partially cutaway cross-sectional view of a vibration isolating mechanism used in a vibration isolating structure for a vehicle seat according to a third embodiment of the present invention as viewed from the front of the vehicle. It is the perspective view seen from the vehicle left front which shows the structure of the vehicle seat to which the conventional vibration isolating structure for vehicle seats was applied. It is sectional drawing seen from the vehicle left side which shows the vibration proof mechanism used for the conventional vibration proof structure for vehicle seats.

(First embodiment)

  FIG. 1 shows a configuration of a vehicle seat 12 as a seat to which a vehicle seat vibration-proof structure 10 according to a first embodiment of the present invention is applied, in a perspective view seen from the left front side of the vehicle. Yes. In the drawings, the front side of the vehicle is indicated by an arrow FR, the right side of the vehicle (one side in the vehicle width direction) is indicated by an arrow RH, and the upper side of the vehicle is indicated by an arrow UP.

  As shown in this figure, a pair of front leg brackets 14 is provided below the vehicle seat 12, and the front leg brackets 14 are fixed to the floor of the vehicle. A plate-like rail fixing portion 14a is provided on the upper portion of the front leg bracket 14, and the rail fixing portion 14a is disposed horizontally. A pair of rear leg brackets 16 are provided behind the pair of front leg brackets 14, and the rear leg brackets 16 are fixed to the floor of the vehicle.

  A front-rear position adjusting mechanism 20 is provided above the front leg bracket 14 and the rear leg bracket 16. The front / rear position adjusting mechanism 20 includes a pair of long slide rails 22. The pair of slide rails 22 are arranged in parallel along the vehicle front-rear direction and are fixed to the rail fixing portion 14 a of the front leg bracket 14 and the rear leg bracket 16. The slide rail 22 is bent into a substantially C-shaped cross section. An upper rail 24 as a first member is provided in each of the pair of slide rails 22, and the upper rail 24 is configured to be slidable in the vehicle front-rear direction. Thus, the upper rail 24 is indirectly attached to the vehicle floor via the slide rail 22, the front leg bracket 14, and the rear leg bracket 16.

  Above each upper rail 24, a riser 26 having a substantially U-shaped cross section as a second member is provided, and each riser 26 is supported by a vibration isolation mechanism 30 (to be described later). (See FIG. 2).

  As shown in FIG. 3, an insertion hole 32 having a substantially circular cross section is formed through the lower surface of the riser 26, and corresponds to the insertion hole 32 of the riser 26 between the upper rail 24 and the riser 26. In the position, a vibration isolation mechanism 30 is provided.

  The anti-vibration mechanism 30 includes a stepped pin 34 as a shaft portion. The stepped pin 34 has a substantially cylindrical main body 36, the lower end of the main body 36 is fixed to the upper rail 24, and the stepped pin 34 protrudes upward from the upper rail 24. The stepped pin 34 is disposed coaxially with the insertion hole 32 of the riser 26 and is inserted through the insertion hole 32. For this reason, the stepped pin 34 is configured to be movable relative to the riser 26 in the vertical direction.

  A substantially cylindrical male screw part 38 is provided at the upper end (tip) of the main body part 36, and the male screw part 38 is arranged coaxially with the main body part 36 and protrudes upward from the upper surface of the main body part 36. ing. The outer diameter dimension of the male screw part 38 is set smaller than the outer diameter dimension of the main body part 36, and a thread groove is formed in the outer peripheral part of the male screw part 38.

  Further, a substantially hexagonal cylindrical flange nut 40 is provided on the male thread portion 38 of the stepped pin 34. A female screw portion (not shown) having a circular cross section is formed through the center portion of the flange nut 40, and a thread groove is formed in the inner peripheral portion of the female screw portion. The flange nut 40 is attached to the stepped pin 34 by screwing the female screw portion of the flange nut 40 into the male screw portion 38. At the lower end of the flange nut 40, a substantially annular flange portion 42 as a flange portion is provided on the outer peripheral portion. The outer diameter dimension of the flange portion 42 is set larger than the outer diameter dimension of the main body portion 36 and the inner diameter size of the insertion hole 32 of the riser 26, and the flange portion 42 abuts on the upper surface of the main body portion 36. , Disposed above the riser 26.

  Above the upper rail 24, a stopper 44 having a substantially U-shaped cross section that constitutes the vibration isolation mechanism 30 is provided. A through hole 46 having a circular cross section is formed through the center of the stopper 44, and the inner diameter of the through hole 46 is set slightly larger than the outer diameter of the main body 36. The stopper 44 is fixed to the upper rail 24 with the stepped pin 34 passing through the through hole 46. Stopper portions 48 as blocking portions are provided at both ends of the stopper 44, and the stopper portion 48 protrudes upward with respect to the stopper 44. A gap G is provided between the tip of the stopper portion 48 and the riser 26, and the gap G is set to be smaller than the maximum amount of deflection that a spring body 50 described later can elastically deform downward.

  The vibration isolation mechanism 30 includes a spring body 50 made of metal as an elastic body, and the spring body 50 is disposed between the stopper 44 (upper rail 24) and the riser 26. A cylindrical first contact portion 52 as an input portion is provided at the lower portion of the spring body 50, and the inner diameter dimension of the first contact portion 52 is the outer diameter dimension of the main body portion 36 of the stepped pin 34. It is set slightly larger than A cylindrical second contact portion 54 as a transmission portion is provided on the upper portion of the spring body 50. The second contact portion 54 is formed with a diameter larger than that of the first contact portion 52 and is arranged coaxially with the first contact portion 52. Further, a plate-like connecting portion 56 is provided between the second contact portion 54 and the first contact portion 52. The connecting portion 56 connects the second abutting portion 54 and the first abutting portion 52, and the connecting portion 56 is disposed so as to be inclined upward toward the radially outer side of the first abutting portion 52. .

  The spring body 50 is arranged coaxially with the stepped pin 34, and the stepped pin 34 is inserted into the spring body 50. Further, the first contact portion 52 is contacted to the upper rail 24 via the stopper 44, the second contact portion 54 is contacted to the riser 26, and the riser 26 is supported by the spring body 50. . For this reason, the spring body 50 is held between the stopper 44 (upper rail 24) and the riser 26. Further, the spring body 50 is configured to be elastically deformable in the vertical direction (the axial direction of the spring body 50). When a downward load is applied to the second contact portion 54, the spring body 50 is The connecting portion 56 is elastically deformed so that the inclination angle becomes horizontal.

  The anti-vibration mechanism 30 includes a substantially cylindrical bush 58 made of resin. A substantially annular flange 60 is integrally provided at the upper portion of the bush 58 at the outer peripheral portion of the bush 58, and the flange 60 protrudes radially outward of the bush 58 with respect to the bush 58. Further, a claw portion 62 having a substantially triangular annular section is integrally provided at the lower portion of the bush 58 at the outer peripheral portion of the bush 58, and the claw portion 62 protrudes outward in the radial direction of the bush 58 with respect to the bush 58. ing. The claw portion 62 and the flange 60 sandwich the entire peripheral edge portion of the insertion hole 32 of the riser 26, whereby the bush 58 is held inside the insertion hole 32.

  The inner diameter of the bush 58 is set to be slightly larger than the outer diameter of the main body 36 of the stepped pin 34, and the main body 36 is inserted inside the bush 58. As a result, when the main body portion 36 moves relative to the bush 58 in the vertical direction, the outer peripheral portion of the main body portion 36 makes sliding contact with the inner peripheral portion of the bush 58. Further, the bush 58 is configured to be able to contact the flange portion 42 of the flange nut 40, and the relative movement of the riser 26 relative to the upper rail 24 is restricted by the bush 58 contacting the flange portion 42. The Thereby, the maximum distance between the riser 26 and the upper rail 24 is set by the stepped pin 34 and the flange portion 42.

  On the other hand, as shown in FIG. 1, a substantially cylindrical cushion frame 70 is stretched along the vehicle width direction on the front part of the pair of risers 26, and the cushion frame 70 is located on the right side of the riser 26. Is extended to the right of the vehicle. Further, the vehicle right side portion of the cushion frame 70 is bent toward the rear of the vehicle.

  A substantially cylindrical support frame 72 is stretched over the pair of risers 26 at the rear of the vehicle along the vehicle width direction, and the support frame 72 projects rightward from the riser 26 on the right side of the vehicle. . The vehicle right end of the cushion frame 70 and the vehicle right end of the support frame 72 are connected by a connection bracket 74.

  Furthermore, seat cushions (not shown) constituting the vehicle seat 12 are mounted (attached) to the cushion frame 70, the support frame 72, and the riser 26. For this reason, the seat cushion is supported by the cushion frame 70, the support frame 72, and the riser 26.

  An arm 76 is rotatably supported at the rear end of the riser 26 on the left side of the vehicle, and an arm 78 is rotatably supported at the rear end of the connecting bracket 74 in the vehicle. The arm 76 and the arm 78 are connected to both ends of a back frame 80 bent in a substantially U shape when viewed from the front side of the vehicle.

  In addition, a reclining bracket 82 is rotatably connected to an end of the riser 26 on the right side of the vehicle on the rear side of the vehicle. A back frame 84 is provided above the reclining bracket 82, and the back frame 84 is fastened to the reclining bracket 82 by bolts or the like (not shown). The upper portion of the back frame 84 is connected to the back frame 80 by a connection bracket (not shown). Further, a seat back (not shown) that constitutes the vehicle seat 12 is mounted (attached) to the back frame 80 and the back frame 84. For this reason, the seat back is supported by the back frame 80 and the back frame 84.

  Next, the operation of the first embodiment will be described.

  In the vehicle seat 12 to which the vehicle seat vibration isolating structure 10 is applied, the upper rail 24 is attached to the vehicle floor via the front leg bracket 14, the rear leg bracket 16, and the slide rail 22. The riser 26 supports the seat cushion of the vehicle seat 12. Further, a vibration isolating mechanism 30 is provided between the upper rail 24 and the riser 26.

  When the occupant sits on the seat cushion of the vehicle seat 12, a downward load acts on the riser 26 due to the weight of the occupant. The riser 26 is supported by the spring body 50, and the first contact portion 52 of the spring body 50 is in contact with the upper rail 24 via the stopper 44, so the second contact portion of the spring body 50 from the riser 26. A downward load acts on 54. For this reason, the spring body 50 is elastically deformed so that the inclination angle of the connecting portion 56 becomes horizontal, and the second contact portion 54 moves downward. As a result, the riser 26 and the bush 58 are moved downward relative to the upper rail 24, and the bush 58 is separated from the flange portion 42 of the flange nut 40.

  When vertical vibration is input from the vehicle floor to the upper rail 24 via the front leg bracket 14, the rear leg bracket 16, and the slide rail 22, the vibration causes the stopper 44 to move from the upper rail 24. Via the first contact portion 52 of the spring body 50. For this reason, the vibration input to the first contact portion 52 is attenuated by the spring body 50 and transmitted from the second contact portion 54 of the spring body 50 to the riser 26. Thereby, the vibration transmitted from the floor portion of the vehicle to the seat cushion can be suppressed by the spring body 50. At this time, the stepped pin 34 moves relative to the bush 58 in the vertical direction, and the outer peripheral portion of the body portion 36 of the stepped pin 34 is in sliding contact with the inner peripheral portion of the bush 58.

  Further, when the riser 26 moves relatively downward relative to the upper rail 24, the riser 26 abuts against the stopper portion 48 of the stopper 44, thereby preventing the downward relative movement of the riser 26 with respect to the upper rail 24. Is done. On the other hand, when the riser 26 is relatively moved upward relative to the upper rail 24, the riser 26 (bush 58) comes into contact with the flange portion 42 of the flange nut 40, so that the riser 26 is moved upward with respect to the upper rail 24. Relative movement is prevented.

  Further, when vibration in a direction perpendicular to the vertical direction is input from the floor of the vehicle to the upper rail 24 via the front leg bracket 14, the rear leg bracket 16, and the slide rail 22, the upper rail 24 and the step The attached pin 34 tries to move in a direction orthogonal to the vertical direction. At this time, since the outer peripheral portion of the main body portion 36 of the stepped pin 34 contacts the inner peripheral portion of the bush 58, the relative movement between the upper rail 24 and the riser 26 is restricted in the direction perpendicular to the vertical direction. .

  Incidentally, a seat cushion is attached to the riser 26, and an occupant sits on the seat cushion. For this reason, a high load acts on the vibration isolation mechanism 30 (spring body 50).

  Here, the spring body 50 is made of metal. The spring body 50 includes a cylindrical first contact portion 52 to which vibration of the upper rail 24 is input via the stopper 44, and a cylinder that transmits the vibration input to the first contact portion 52 to the riser 26. The first abutting portion 52 and the second abutting portion 54 are connected by a plate-like connecting portion 56. For this reason, since the spring body 50 can be shape | molded from a plate-shaped metal, the mechanical strength of the spring body 50 can be made high. Thereby, the vibration isolating mechanism 30 can be applied between the upper rail 24 and the riser 26 that require strength.

  Further, the upper rail 24 is provided with a stepped pin 34, the flange portion 42 of the flange nut 40 abuts on the upper surface of the main body portion 36 of the stepped pin 34, and the flange nut 40 is attached to the stepped pin 34. Installed. Further, the bush 58 is configured to be able to contact the flange portion 42 of the flange nut 40, and the relative movement of the riser 26 relative to the upper rail 24 is restricted by the bush 58 contacting the flange portion 42. The For this reason, the maximum distance between the riser 26 and the upper rail 24 can be set by the stepped pin 34 and the flange portion 42. Thereby, the spring body 50 can always be brought into contact with the upper rail 24 and the riser 26. Therefore, the vibration input to the upper rail 24 via the spring body 50 can always be transmitted to the riser 26.

  Further, the riser 26 is formed with an insertion hole 32 through which the stepped pin 34 is inserted, and a bush 58 is provided on the inner peripheral portion of the insertion hole 32. When the upper rail 24 moves in a direction perpendicular to the vertical direction, the outer peripheral portion of the stepped pin 34 comes into contact with the inner peripheral portion of the bush 58, so that the insertion hole 32 is stepped via the bush 58. The movement of the pin 34 is limited.

  Thereby, relative movement of the upper rail 24 and the riser 26 is suppressed in a direction orthogonal to the axial direction of the spring body 50. For this reason, the relative movement of the spring body 50, the upper rail 24, and the riser 26 is suppressed, and the occurrence of sliding friction between the spring body 50, the upper rail 24, and the riser 26 can be suppressed. Therefore, deterioration of the vibration characteristics of the spring body 50 due to sliding friction between the spring body 50 and the upper rail 24 and the riser 26 can be suppressed in a direction orthogonal to the axial direction of the spring body 50.

  Further, as described above, the bush 58 is provided in the inner peripheral portion of the insertion hole 32, and the stepped pin 34 is inserted into the bush 58. When the stepped pin 34 moves relative to the bush 58 in the vertical direction, the outer peripheral portion of the body portion 36 of the stepped pin 34 is slidably contacted with the inner peripheral portion of the bush 58. For this reason, since the stepped pin 34 and the riser 26 are not directly slid, the upper rail 24 can smoothly move relative to the riser 26. Thereby, the deterioration of the vibration characteristics due to the stepped pin 34 being inserted through the insertion hole 32 can be suppressed.

  Further, the riser 26 is disposed between the flange portion 42 of the flange nut 40 and the upper rail 24. For this reason, the flange nut 40 can be assembled to the male screw portion 38 after the main body portion 36 of the stepped pin 34 is inserted into the insertion hole 32 of the riser 26. Thereby, assembly property can be improved.

  Further, the inner diameter dimension of the first contact portion 52 of the spring body 50 is set slightly larger than the outer diameter dimension of the main body portion 36 of the stepped pin 34, and the stepped pin 34 is inside the spring body 50. It is arranged in a state where it is inserted. For this reason, the position of the spring body 50 can be set by the stepped pin 34, and the relative movement between the spring body 50 and the upper rail 24 can be suppressed. Thereby, the assembling property can be further improved, and the deterioration of the vibration characteristics of the spring body 50 can be further suppressed.

  Further, a stopper 44 is fixed to the upper rail 24, and a stopper portion 48 is provided on the stopper 44. The stopper portion 48 is disposed between the upper rail 24 and the riser 26 and is separated from the riser 26 (having a gap G between the stopper portion 48 and the riser 26). When the riser 26 moves relatively downward relative to the upper rail 24, the riser 26 abuts against the stopper portion 48, so that the downward relative movement of the riser 26 relative to the upper rail 24 is prevented. Further, the gap G is set to be smaller than the maximum deflection amount of the spring body 50 that can be elastically deformed. Thereby, since the spring body 50 is elastically deformed in the elastic deformation region, it is possible to suppress the spring body 50 from being plastically deformed.

  The upper rail 24 is attached to the floor of the vehicle via the slide rail 22, the front leg bracket 14, and the rear leg bracket 16. A seat cushion is attached to the riser 26, and the riser 26 supports the seat cushion. For this reason, the vibration input from the floor of the vehicle can be attenuated by the spring body 50 and transmitted to the seat cushion.

(Second Embodiment)

  FIG. 4 shows a part of the configuration of the vehicle seat 12 to which the vehicle seat vibration-proof structure 100 according to the second embodiment of the present invention is applied, in a side view seen from the left side of the vehicle. Yes. In the drawings, the front side of the vehicle is indicated by an arrow FR, the right side of the vehicle (one side in the vehicle width direction) is indicated by an arrow RH, and the upper side of the vehicle is indicated by an arrow UP.

  The second embodiment has substantially the same configuration as the first embodiment, but differs in the following points.

  The anti-vibration mechanism 30 is not provided between the upper rail 24 and the riser 26, and the riser 26 is fastened to the upper rail 24 by fastening parts such as bolts (not shown).

  On the other hand, an anti-vibration mechanism 30 is provided between the pair of front leg brackets 14 as the first member and the pair of slide rails 22 as the second member.

  An insertion hole 32 is formed through the lower surface of the slide rail 22 in the front portion of the vehicle. Further, the stepped pin 34 and the flange nut 40 are integrally formed, and a flange portion 42 is integrally provided at the upper end portion of the main body portion 36 of the stepped pin 34 by caulking or the like. That is, after the stepped pin 34 erected on the front leg bracket 14 is inserted into the insertion hole 32 of the slide rail 22, the flange portion 42 can be provided above the slide rail 22 by caulking or the like.

  Further, the front leg bracket 14 is integrally provided with a stopper portion 48 in front of the spring body 50 in the vehicle, and the stopper portion 48 protrudes upward from the rail fixing portion 14a. Therefore, the first contact portion 52 of the spring body 50 is in contact with the front leg bracket 14, and the second contact portion 54 of the spring body 50 is in contact with the slide rail 22.

  Here, also in 2nd Embodiment, there exists an effect | action and effect similar to 1st Embodiment.

(Third embodiment)

  FIG. 5 shows a partially broken cross-sectional view of a vibration isolating mechanism 30 used in a vehicle seat vibration isolating structure 200 according to a third embodiment of the present invention as viewed from the front of the vehicle. In the drawings, the front side of the vehicle is indicated by an arrow FR, the right side of the vehicle (one side in the vehicle width direction) is indicated by an arrow RH, and the upper side of the vehicle is indicated by an arrow UP.

  The third embodiment has substantially the same configuration as the first embodiment, but differs in the following points.

  The anti-vibration mechanism 30 is not provided between the upper rail 24 and the riser 26, and the riser 26 is fastened to the upper rail 24 by fastening parts such as bolts (not shown).

  On the other hand, an anti-vibration mechanism 30 is provided between the reclining bracket 82 as the first member and the back frame 84 as the second member.

  A through hole 202 having a circular cross section is formed through the lower end of the back frame 84. A weld nut 204 is provided on the left side of the vehicle on the back frame 84, and the weld nut 204 is arranged coaxially with the through hole 202 and is fixed to the back frame 84.

  The stepped pin 34 and the flange nut 40 are integrally formed. A substantially columnar male screw portion 210 is provided at the left end of the main body portion 36 of the stepped pin 34, and the male screw portion 210 projects leftward of the main body portion 36. A thread groove is formed in the outer peripheral portion of the male screw portion 210, and the stepped pin 34 is fixed to the back frame 84 by screwing the male screw portion 210 into the weld nut 204. A substantially cylindrical head portion 212 is provided at the end of the stepped pin 34 on the right side of the vehicle, and a flange portion 42 is provided between the head portion 212 and the main body portion 36.

  A stopper 44 is provided on the vehicle right side of the back frame 84. The stopper 44 is formed in a substantially annular shape, and a substantially cylindrical stopper portion 48 is formed at the center of the stopper 44. The stopper 44 is fixed to the back frame 84 with the stepped pin 34 inserted into the through hole 46 of the stopper portion 48.

  The first contact portion 52 of the spring body 50 is formed with a larger diameter than the second contact portion 54. In addition, the inner diameter dimension of the second contact portion 54 is set slightly larger than the outer diameter dimension of the stopper portion 48, and the stopper portion 48 is disposed inside the second contact portion 54. Further, the first contact portion 52 is in contact with the reclining bracket 82, and the second contact portion 54 is in contact with the back frame 84 via the stopper 44.

  An insertion hole 32 is formed through the reclining bracket 82. Further, a substantially annular claw portion 62 is provided at the outer peripheral portion of the bush 58 on the left side of the vehicle, and a gap G is provided between the claw portion 62 and the stopper portion.

  When vibration in the vehicle left-right direction is input to the reclining bracket 82 via the front leg bracket 14, the rear leg bracket 16, the slide rail 22, the upper rail 24, and the riser 26 from the floor of the vehicle, the vibration is generated. Then, it is input from the reclining bracket 82 to the first contact portion 52 of the spring body 50. The vibration input to the first contact portion 52 is attenuated by the spring body 50 and transmitted from the second contact portion 54 of the spring body 50 to the back frame 84 via the stopper 44. Thereby, the vibration transmitted from the floor portion of the vehicle to the seat back can be suppressed by the spring body 50. At this time, the stepped pin 34 moves relative to the bush 58 in the left-right direction of the vehicle, and the outer peripheral portion of the main body 36 of the stepped pin 34 makes sliding contact with the inner peripheral portion of the bush 58.

  Further, when the back frame 84 is moved relatively to the right of the vehicle with respect to the reclining bracket 82, the stopper portion 48 of the stopper 44 abuts against the bush 58 (the reclining bracket 82), so that the reclining bracket of the back frame 84. Relative movement of the vehicle 82 to the right of the vehicle is prevented.

  Furthermore, when vibration in a direction perpendicular to the vehicle left-right direction is input to the reclining bracket 82 via the front leg bracket 14, the rear leg bracket 16, the slide rail 22, the upper rail 24, and the riser 26 from the floor of the vehicle. The reclining bracket 82 and the bush 58 are about to move in a direction orthogonal to the vehicle left-right direction. At this time, since the outer peripheral portion of the main body portion 36 of the stepped pin 34 contacts the inner peripheral portion of the bush 58, the relative movement between the reclining bracket 82 and the back frame 84 is restricted in the direction orthogonal to the vehicle left-right direction. Is done.

  Here, also in the third embodiment, the first embodiment is different from the first embodiment except that the vibration input from the vehicle floor in the first embodiment can be attenuated by the spring body 50 and transmitted to the seat cushion. The same operation and effect are produced.

  The reclining bracket 82 is attached to the floor of the vehicle via the riser 26, the upper rail 24, the slide rail 22, the front leg bracket 14, and the rear leg bracket 16. In addition, a seat back is mounted on the back frame 84, and the back frame 84 supports the seat back. For this reason, the vibration input from the floor of the vehicle can be attenuated by the spring body 50 and transmitted to the seat back.

  In the first embodiment and the second embodiment, the stepped pins 34 are fixed to the upper rail 24 and the front leg bracket 14, respectively. Instead of this, the stepped pins 34 may be fixed to the riser 26 and the slide rail 22, respectively. In this case, the insertion holes 32 are provided in the upper rail 24 and the front leg bracket 14, respectively.

  In the third embodiment, a weld nut 204 is provided on the back frame 84. Instead, a weld nut 204 may be provided on the reclining bracket 82. In this case, the through hole 202 is provided in the reclining bracket 82 and the insertion hole 32 is provided in the back frame 84.

  In the first embodiment, the second embodiment, and the third embodiment, the stopper portion 48 is provided on the upper rail 24, the front leg bracket 14, and the back frame 84. Instead of this, the stopper portion 48 may be provided on the riser 26, the slide rail 22, and the reclining bracket 82.

  Further, the stopper portion 48 in the first embodiment and the third embodiment may be provided integrally with the upper rail 24 and the back frame 84 as in the second embodiment.

  In the first embodiment and the third embodiment, the stopper 44 is fixed to the upper rail 24 and the back frame 84. Instead of this, the stopper 44 may be held by the spring body 50, the upper rail 24, and the back frame 84.

  Further, in the first embodiment, the second embodiment, and the third embodiment, the bush 58 is made of resin. Alternatively, the bush 58 may be made of metal.

  In the first embodiment, the second embodiment, and the third embodiment, the bush 58 is provided on the inner peripheral portion of the insertion hole 32, and the upper rail 24, the front leg bracket 14, When the reclining bracket 82 moves in a direction orthogonal to the axial direction of the stepped pin 34, the outer peripheral portion of the stepped pin 34 contacts the inner peripheral portion of the bush 58. Instead, the upper rail 24, the front leg bracket 14, and the reclining bracket 82 move in a direction orthogonal to the axial direction of the stepped pin 34 without providing the bush 58 on the inner peripheral portion of the insertion hole 32. In addition, the outer peripheral portion of the stepped pin 34 may abut on the inner peripheral portion of the insertion hole 32.

10 Anti-vibration structure for vehicle seat 12 Vehicle seat (seat)
14 Front leg bracket (first member)
22 Slide rail (second member)
24 Upper rail (first member)
26 Riser (second member)
32 Insertion hole 34 Stepped pin (shaft)
42 Flange part
48 Stopper part (blocking part)
50 Spring body (elastic body)
52 1st contact part (input part)
54 Second contact part (transmission part)
56 Connection part 58 Bushing 82 Reclining bracket (first member)
84 Back frame (second member)
100 Anti-vibration structure for vehicle seat 200 Anti-vibration structure for vehicle seat

Claims (8)

Provided between the first member and the second member constituting the seat of a vehicle, a cylindrical input vibration of said first member is inputted, the inputted vibration to the input portion to the second member said input portion than the diameter of the large cylindrical transmission portion as well as transmission, the comprising: an input section and the transmission section and the connecting plate of the connecting portion, and an elastic body that is fabricated of a metal,
The first member and the second member are provided between the first member and the second member, are provided on the first member, are spaced apart from the second member, and come into contact with the second member. A blocking portion for blocking relative movement in the approach direction between the members;
Anti-vibration structure for vehicle seats.   The first member and the second member are provided on one of the first member and the second member and configured to be relatively movable with respect to the other of the first member and the second member. The vehicle seat vibration-proof structure according to claim 1, further comprising a shaft portion having a flange portion that restricts relative movement in the separation direction between the first and second members.   An insertion hole is formed in one of the first member and the second member, and the shaft portion is inserted therethrough to restrict movement of the shaft portion in a direction orthogonal to the axial direction of the elastic body. The anti-vibration structure for a vehicle seat according to claim 2 provided.   The vibration isolating structure for a vehicle seat according to claim 3, further comprising a bush that is provided in an inner peripheral portion of the insertion hole and is slidably contacted with the shaft portion in an axial direction of the shaft portion.   5. The vehicle seat according to claim 3, wherein either one of the first member and the second member is disposed between the flange and one of the first member and the second member. Anti-vibration structure.   The vibration isolating structure for a vehicle seat according to any one of claims 2 to 5, wherein the shaft portion is disposed in a state of being inserted through the elastic body. The first member is directly or indirectly attached to a vehicle floor;
The vibration isolating structure for a vehicle seat according to any one of claims 1 to 6 , wherein the second member supports a seat cushion of the seat. The first member is indirectly attached to the floor of the vehicle;
The vibration isolating structure for a vehicle seat according to any one of claims 1 to 6 , wherein the second member supports a seat back of the seat.

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