JP2011230587A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat for vehicle in which vibration is hard to occur and amplitude is small.SOLUTION: In a seat 1 for vehicle which includes a seat cushion 2, a seat back 3 connected to be able to be reclined through reclining mechanism 6, and a leg 5, and is slide-movable by a rail mechanism 10, the rail mechanism 10 is provided at the side of the reclining mechanism 6. A guide rail 11 is provided vertically at the inside plane of the leg 5, a sliding member 12 is provided at the outer plane of a side frame 2s of a seat cushion 2.

Description

  The present invention relates to a vehicle seat that is slidable in a vehicle longitudinal direction by a rail mechanism, and more particularly to a vehicle seat having a vibration isolation structure.

  As this type of vehicle seat, for example, there is Patent Document 1 below. The vehicle seat of Patent Document 1 includes a seat cushion, a seat back that is tiltably connected to the seat cushion via a reclining mechanism, and a rail mechanism that is attached to the seat cushion. It can slide in the direction. As an anti-vibration structure for the seat, an elastic body is interposed between the seat back frame and a rod installed in the vehicle width direction between the seat back frames. Thereby, it is said that the vibration transmitted from the vehicle body to the seat is absorbed by the elastic body, thereby suppressing the vibration of the seat. In the vehicle seat disclosed in Patent Document 1, the rail mechanism is provided below the seat. Specifically, a sliding member that also serves as a leg fixed to the seat cushion slides and moves in the vehicle front-rear direction with respect to the pair of left and right guide rails fixed to the vehicle floor.

JP 2009-196414 A

  In Patent Document 1, an anti-vibration is achieved by interposing an elastic body between a seat back frame and a rod installed between them. However, in Patent Document 1, a rail mechanism is provided below the seat cushion. Here, as shown in FIG. 4, in the vehicle seat 100 having the rail mechanism 101, the rail mechanism 101 acts like a spring and thus vibrates around the rail mechanism 101. Therefore, if the rail mechanism is provided below the seat cushion as in Patent Document 1, even if the vibration can be prevented to some extent by the elastic body, the seat has a large amplitude, and thus a fundamental solution has not been achieved. In addition, since the reclining mechanism 102 having a relatively large weight is located above the starting point (axis) of the amplitude among the seats, the vibration mass increases and the amplitude is likely to increase.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a vehicle seat that can reliably reduce the amplitude of the seat.

  As a means for this, the present invention includes a seat cushion, a seat back that is tiltably coupled to the seat cushion via a reclining mechanism, and a rail mechanism attached to the seat cushion. A vehicle seat slidably movable in a direction, wherein a rail mechanism is provided on a side of the reclining mechanism. That is, the rail mechanism is provided at the same height as the reclining mechanism. According to this, since the relative height position of the rail mechanism with respect to the seat is higher than the conventional one, the amplitude starting point of the seat is also increased. Thus, the amplitude of the sheet can be reliably reduced. Further, the reclining mechanism that has conventionally contributed greatly to the increase in the amplitude of the seat is at the same height as the rail mechanism that is the starting point of the amplitude of the seat. Thereby, an increase in amplitude due to the reclining mechanism can also be avoided.

In addition, since the distance between the reclining mechanism and the rail mechanism is reduced, the moment span is reduced, the vibration mass is reduced, and the resonance frequency of the seat is increased. That is, when the vibration mass of the seat is m and the elastic coefficient (spring constant) of the rail mechanism that is the starting point of the amplitude is k, the resonance frequency f _{0 of the} seat is expressed by the following equation 1.

そして、上式においてシートの振動質量ｍが低減すれば、シートの共振周波数ｆ_０が高くなることがわかる。これにより、シートの共振周波数をアイドル運転時の振動周波数（一般的に２０〜３０Ｈｚ程度）や、粗面路走行時の振動周波数（一般的に１５〜２０Ｈｚ程度）よりも高くすることが可能であり、シートの防振も図ることができる。

Then, if the vibration mass m of the sheet reduced in the above equation, it can be seen that the resonance frequency f ₀ of the sheet is increased. As a result, the resonance frequency of the seat can be made higher than the vibration frequency during idle operation (generally about 20 to 30 Hz) or the vibration frequency during rough road travel (generally about 15 to 20 Hz). Yes, it is possible to achieve vibration isolation of the sheet.

  The vehicle seat of the present invention further includes a pair of left and right legs that support the seat cushion. In this case, in the present invention, since the rail mechanism is provided on the side of the reclining mechanism, the leg can be directly fixed to the vehicle floor. Thereby, the rigidity of a leg is securable with a simple structure. That is, conventionally, since a rail mechanism is provided at the lower end of the leg, it was necessary to ensure the rigidity of the leg with a relatively complicated shape based on this, but in the present invention, such a limitation is imposed. Since there is no leg, the shape of the leg can be simplified.

  The rail mechanism includes a guide rail and a sliding member that slides relative to the guide rail. As a mode in which the sliding member slides relative to the guide rail, the sliding member slides relative to the stationary guide rail and, of course, guides to the stationary stationary member. This includes the case where the rail slides. In addition, one of the guide rail and the sliding member constituting the rail mechanism can be provided on the leg, and the other can be provided on the seat cushion. Since the leg is fixed to the vehicle floor, the sliding member or guide rail provided on the seat cushion slides relative to the guide rail or sliding member provided on the leg. According to this, the rail mechanism can be simplified. Therefore, it is effective for avoiding an increase in the size of the seat.

  The width between the pair of left and right legs is larger than the width of the seat cushion, and the upper edge of both legs extends to the side of the seat cushion, and the sliding member is provided on the side of the seat cushion. It is preferable that the guide rail is provided on the inner surface of the upper edge of the leg, and the guide groove for sliding the sliding member is provided vertically so as to open sideways. That is, the guide rail and the sliding member are in a side-by-side relationship at the same height position. As in the prior art, the guide rail can be horizontally arranged so that the guide groove opens upward, and the guide rail and the sliding member can be engaged with each other so as to overlap each other. However, in this case, it is necessary to engage with the sliding member folded downward from the side surface of the seat cushion. Therefore, since the distance from the seat cushion to the rail mechanism is increased, the amplitude of the seat is easily increased accordingly. On the other hand, if the guide rails are arranged vertically, the sliding member only needs to extend horizontally from the side surface of the cushion frame, so that the distance from the cushion to the rail mechanism can be shortened. Thereby, the amplitude of the sheet can be reduced more reliably.

  In the present invention, since the rail mechanism that is the starting point of the seat amplitude is raised to the same height as the reclining mechanism, the seat amplitude can be reliably reduced. In addition, since the distance between the reclining mechanism and the rail mechanism is closer, the resonance frequency of the seat can be made higher than the vibration frequency during idle operation and the vibration frequency during rough road travel, and the vibration of the seat can also be improved. .

It is a partially broken front view showing a skeleton structure of a vehicle seat. It is a side view which shows the frame | skeleton structure of a vehicle seat. It is the sectional view on the AA line of FIG. It is a front view which shows the frame structure of the conventional vehicle seat.

(Example)
Hereinafter, typical examples of a vehicle seat according to the present invention will be described with reference to the drawings as appropriate. As shown in FIGS. 1 and 2, the seat 1 includes a seat cushion 2 that serves as a seat for the occupant, a seat back 3 that serves as a backrest for the occupant, a headrest 4 that supports the head of the occupant, and the seat cushion 2. A pair of left and right legs 5 that are supported at a predetermined height from the vehicle floor F, and a rail mechanism 10 that slides the seat cushion 2 and the like in the vehicle front-rear direction with respect to the vehicle floor F are provided. The seat cushion 2, the seat back 3, and the headrest 4 actually have a pad material as a cushioning material and a skin covering the pad material, but FIGS. 1 and 2 show a skeleton without the pad material and the skin. Shown in structure.

  The cushion frame that forms the skeleton of the seat cushion 2 has a planar portal shape having left and right side frames 2s and 2s that extend in the vehicle front-rear direction and a front frame that connects the ends of the side frames 2s and 2s. In addition, in FIG. 1, it has shown in the state which fractured | ruptured the front part of the cushion frame. The back frame constituting the skeleton of the seat back 3 has a portal shape having left and right side frames 3 s and 3 s standing upward from the seat cushion 2 and an upper frame 3 u connecting the upper ends of the side frames 3 s and 3 s. . The lower end of the seat back 3 is connected via reclining mechanisms 6 and 6 provided at the rear ends of the side frames 2s and 2s of the seat cushion 2. As a result, the seat back 3 can tilt in the vehicle front-rear direction with respect to the seat cushion 2. Reference numeral 6a is a rod installed between the left and right reclining mechanisms 6,6. The headrest 4 has two left and right stays 4s and 4s, and both the stays 4s and 4s are detachably inserted into cylindrical supports 3a and 3a provided on the upper frame 3u of the seat back 3. The left and right legs 5, 5 have a gate shape having a predetermined length in the vehicle front-rear direction, and are arranged along the side surface of the seat cushion 2. The lower ends of both legs 5 and 5 are directly fixed to the vehicle floor F and are immobile. The width dimension between both legs 5 and 5 is larger than the width dimension of the seat cushion 2 (at least the width dimension of the cushion frame). The upper edge portions of both legs 5, 5 extend to the side of the seat cushion 2. Reference numeral 5a is a stay constructed between the legs 5 and 5.

  The rail mechanism 10 includes a guide rail 11 and a sliding member 12 that engages with the guide rail 11 and relatively slides, and is provided on the side of the reclining mechanism 6. That is, the rail mechanism 10 is provided on both the left and right sides of the seat cushion 2 at substantially the same height as the reclining mechanism 6. Specifically, the sliding member 12 is provided on the side surfaces (outer surfaces) of the left and right side frames 2s and 2s of the seat cushion 2, and the guide rail 11 is provided on the inner surfaces of the upper edges of the left and right legs 5 and 5. . The guide rail 11 has a length from the front end portion of the seat cushion 2 to the rear end portion. The legs 5 and 5 of the present embodiment are slightly shorter than the guide rail 11, but may have a length that is equal to or greater than that of the guide rail 11.

  As shown in FIG. 3, the guide rail 11 is fixed to the inner surface of the leg 5 by welding, screwing, or the like, and a guide groove 11 a that slides and guides the sliding member 12 opens sideways. It has become. The peripheral edge of the guide groove 11a is bent inward. A plurality of engagement holes 11c with which lock claws 14 to be described later are engaged are arranged in parallel at equal intervals over both ends of the guide rail 11 on one side surface (lower surface in the present embodiment) of the guide rail 11. . The sliding member 12 is shorter than the length of the guide rail 11, and is fixed to the seat cushion 2 via a fixing pin 13 joined to the side frame 2s of the seat cushion 2. The fixing pin 13 is welded in a state of being inserted from the inside into a fixing hole 2a provided in the side frame 2s. As a result, a bonding strength sufficient to withstand the weight of the seat 1 and the passenger is ensured. Since the guide rails 11 are arranged vertically, the straight rod-like fixing pins 13 extend horizontally from the side frames 2s.

  The sliding member 12 cannot be detached from the fixing pin 13 by inserting the tip end portion of the fixing pin 13 into the fixing hole 12a drilled in the center thereof and then crimping the tip end portion of the fixing pin 13. It is connected to. The width dimension (vertical dimension) of the sliding member 12 is slightly smaller than the guide groove 11a, and is slidably engaged with the guide rail 11 through the guide groove 11a. The tip of the sliding member 12 is folded outward. Due to the folded portion 12b of the sliding member 12 and the bent portion 11b of the guide rail 11, the sliding member 12 is prevented from coming off from the guide rail 11. Reference numeral 15 is a cushioning material that cushions the load from the sliding member 12. An engagement hole 12c into which the lock claw 14 is engaged is formed in one of the sliding members 12 (downward in this embodiment).

  The lock claw 14 is pivotally supported on a base plate 16 provided between the side frame 2s of the seat cushion 2 and the sliding member 12. Reference numeral 16 a is a rotation shaft of the lock claw 14. The base plate 16 is also inserted and fixed to the fixing pin 13. The locking claw 14 is always in a direction in which its tip end is engaged with the engaging hole 11c of the guide rail 11 and the engaging hole 12c of the sliding member 12 by the urging spring 17 wound around the fixing pin 13 (locking). Direction). The winding portion of the urging spring 17 is sandwiched between bent portions 16 b and 16 c provided on the periphery of the base plate 16. Reference numeral 18 denotes a washer. The bent portion 16c provided on the inner peripheral edge of the base plate 16 is provided over the entire inner peripheral edge, whereby the strength of the base plate 16 is improved. An operation hole 16d that allows the lock claw 14 to rotate is formed in the bent portion 16c on the inner peripheral edge. A cable 19 for rotating the lock claw 14 is connected to the base end of the lock claw 14.

  Normally, the locking claw 14 is engaged with the engaging hole 11c of the guide rail 11 and the engaging hole 12c of the sliding member 12, so that the sliding member 12 is locked at a predetermined position with respect to the guide rail 11. Has been. As a result, the seat 1 does not always slide. In order to slide the seat 1 in the vehicle front-rear direction with respect to the vehicle floor F, an operation switch (not shown) provided at a predetermined position of the vehicle body or the seat 1 is operated. Then, when the cable 19 is pulled upward, the lock claw 14 rotates about the rotation shaft 16a against the urging force of the urging spring 17, and the engagement state of the lock claw 14 is released. . As a result, the sliding member 12 can slide in the guide rail 11. In this state, the seat cushion 2 and the seat back 3 are pressed in the vehicle front-rear direction. Then, the sliding member 12 slides integrally with the seat cushion 2 with respect to the stationary guide rail 11 joined to the leg 5, so that the seat 1 can be slid to a predetermined position. When the seat 1 is slid to a predetermined position, the operation switch is released and the sliding member 12 and the guide rail 11 are locked.

Thus, in the seat 1 of the present invention, the rail mechanism 10 that is the starting point of the amplitude is raised to the same height position as the reclining mechanism 6, so that the vehicle travels as shown by the two-dot chain line in FIG. 1. The amplitude of the sheet 1 at the time becomes small. Therefore, it is possible to reduce vibrations experienced by the occupant, and further, discomfort caused by the vibrations. Moreover, as the distance between the reclining mechanism 6 and the rail mechanism 10 approaches, the vibration mass m of the seat 1 is reduced, and as is clear from the following equation 1 (k is the elastic coefficient of the rail), the resonance frequency f of the seat 1 ₀ becomes higher. Thereby, the resonance frequency of the seat 1 can be made higher than the vibration frequency of the vehicle body during traveling, and the seat 1 itself is less likely to vibrate.

(Modification)
As mentioned above, although the typical Example of this invention was described, this invention is not limited to this, A various change is possible in the range which does not deviate from the summary of this invention. For example, the sliding member 12 can be provided on the leg 5 and the guide rail 11 can be provided on the seat cushion 2. In this case, the guide rail 11 moves relative to the stationary sliding member 12 integrally with the seat cushion 2. Moreover, the guide rail 11 can also be arranged horizontally. In this case, the fixing pin 13 has a shape bent downward at the intermediate portion. In the above embodiment, the rail mechanism 10 is provided outside the side frame 2s (the reclining mechanism 6), but the width dimension between the left and right legs 5, 5 is made smaller than the width dimension of the seat cushion 2, so that the rail mechanism 10 can also be provided inside the side frame 2s (the reclining mechanism 6).

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 2s Side frame 3 Seat back 4 Headrest 5 Leg 6 Reclining mechanism 10 Rail mechanism 11 Guide rail 12 Sliding member 13 Fixing pin 14 Lock claw 16 Base plate 17 Energizing spring 100 Vehicle seat 101 Rail mechanism 102 Reclining mechanism

Claims (3)

A vehicle seat comprising: a seat cushion; a seat back that is tiltably coupled to the seat cushion via a reclining mechanism; and a rail mechanism that is attached to the seat cushion. The vehicle seat is slidable in the vehicle longitudinal direction by the rail mechanism. Because
The vehicle seat, wherein the rail mechanism is provided on a side of the reclining mechanism. The vehicle seat according to claim 1,
It has a pair of left and right legs that support the seat cushion, and both legs are fixed to the vehicle floor,
The rail mechanism has a guide rail and a sliding member that slides relatively by engaging with the guide rail,
One of the guide rail and the sliding member is provided on the leg, and the other is provided on the seat cushion. The vehicle seat according to claim 2,
The width dimension between the pair of left and right legs is larger than the width dimension of the seat cushion, and the upper edge portion of both legs extends to the side of the seat cushion,
The sliding member is provided on a side surface of the seat cushion,
The vehicle seat, wherein the guide rail is provided on an inner surface of an upper edge portion of the leg, and a guide groove for slidingly guiding the sliding member is provided in a vertical direction so as to open sideways. .

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