JP2012076584A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which appropriately absorbs an impact by preventing seat falling without complicating structure.SOLUTION: A sector gear 1 and a pinion 8 are meshed with each other at a front side of a seat cushion of the vehicle seat, a connection link 3 are journaled by each of a front lifter link 2 and a rear lifter link 6 so as to connect both the links, and a front end of the connection link 3 is journaled at a front position of a meshed position of the sector gear 1 and the pinion 8. Thereby, the connection link 3 functions as a stopper of the rear lifter link 6 which is liable to fall backward by a collision load.

Description

  The present invention relates to a vehicle seat that is supported by a front lifter link and a rear lifter link so that the height of the seat can be adjusted.

  In the collision at the rear of the car, such as a rear collision from the rear or a collision at the time of back running, a so-called rear collision, the excessive impact load at that time is applied to the seat back from the front by the upper body of the seated person, If the overall rigidity of the seat back frame is high, the impact load tends to concentrate on the mechanism of the reclining device, etc. By absorbing an impact load due to plastic deformation at this portion, stress concentration on a mechanism unit such as a reclining device is prevented.

  Incidentally, as an example of such a configuration, a configuration disclosed in, for example, Japanese Patent Application Laid-Open No. 7-132767, which absorbs an impact load by plastically deforming a part of a seat back side frame, is known.

Japanese Patent Laid-Open No. 7-132767 JP 2008-81067 A

By the way, in a vehicle seat with a so-called seat lifter that supports the seat so that it can be raised and lowered by the front and rear lifter links, when the impact load is excessive during a rear impact, the link deforms and the entire seat sinks. There is a risk.
Such sinking of the sheet also has an impact absorbing effect, but if impact absorption occurs due to the sinking of the seat, there is a risk of adversely affecting plastic deformation at the site provided in the seat back frame.
Thus, normally, the seat is prevented from sinking by increasing the rigidity of the lifter link or adding a fall prevention mechanism, but there is a problem that the configuration is likely to be complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle seat that enables appropriate shock absorption by preventing the seat from dropping without complicating the configuration.

The present invention is a vehicle seat in which a parallel link mechanism is configured by a pair of left and right front lifter links and a rear lifter link pivotally supported on a vehicle body side and a seat cushion side so that the height of the seat can be adjusted. There,
A sector gear is fixed to the front side of the vehicle body side, and a driving pinion meshed with the sector gear is arranged on the seat cushion side,
The connecting links are pivotally supported so as to span the front lifter link and the rear lifter link, and the front end of the connecting link is pivotally supported forward from the meshing position of the sector gear and the drive pinion. It is characterized by that.

  In the case of a collision at the rear of the vehicle such as a rear-end collision or a collision at the time of back travel, that is, a so-called rear collision, a large downward load acts on the seat cushion due to a large load applied to the seat back. Therefore, in the present invention, a sector gear is fixed to the front side of the vehicle body side, and a driving pinion disposed on the seat cushion side behind the sector gear is engaged with the sector gear. Therefore, on the front side of the seat cushion, the sector gear and the pinion mesh with each other, and the pinion is located behind the sector gear, so even if a heavy load is applied to the rear lifter link at the time of a rear impact, the pinion is By functioning as a stopper, the height position of the front side of the seat cushion can be maintained in the current state. Since the connecting links are pivotally supported so as to span the front lifter link and the rear lifter link, and the front end of the connecting link is pivotally supported forward from the meshing position of the sector gear and the drive pinion. The connecting link can function as a tension of the rear lifter link that tends to fall backward due to the collision load. This makes it difficult for the rear lifter link to fall backward, and the sinking phenomenon at the time of a rear collision of the seat cushion frame can be appropriately prevented.

Further, since the impact load acting on the seat cushion is also transmitted to the seat cushion frame, the impact load can be effectively dispersed in both the seat cushion frame and the connecting link.
In addition, it is thickened to increase the rigidity of the lifter link, a prevention mechanism is provided to prevent the seat from sinking, and the height of the seat cushion side frame is increased to increase the rigidity of the seat cushion frame. Therefore, according to the present invention, it is possible to reduce the size and weight of the seat.

  And since the left and right connecting links are connected to the left and right front lifter links, the impact load can be very effectively dispersed by the left and right connecting links. Thereby, the sinking phenomenon at the time of rear collision of the seat cushion frame can be more effectively prevented.

  According to the present invention, with a simple configuration, it is possible to prevent the seat from dropping due to an impact at the time of a rear impact on a seated person, and to enable appropriate shock absorption.

1 is a side view showing an embodiment of a vehicle seat according to the present invention. It is a side view which shows the principal part of the vehicle seat which concerns on this invention. FIG. 3 is an exploded perspective view of FIG. 2.

  Hereinafter, a preferred embodiment of a vehicle seat according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the vehicle seat S includes a lifter mechanism that enables height adjustment, and a pair of left and right seat cushion frames 5 that constitute a seat cushion SC, and a pair of left and right seats that constitute a seat back. The back frame 7 is tiltably connected.

  Each seat cushion frame 5 is connected to the upper rail 61 of the slide rail 6 via the front lifter link 2 and the L-shaped rear lifter link 4 which form a parallel link in the front and rear. It is slidably attached to the lower rail 62 of the slide rail 6 fixed to the vehicle floor.

The lifter mechanism that enables the above height adjustment includes the sector gear 1 fixed to the front side of the upper rail 61, the drive pinion 7 provided on the side surface of the seat cushion frame 3, and the front side that forms a parallel link in the front and rear directions. A lifter link 2, an L-shaped rear lifter link 4, and a connecting link 3 are included.

As shown in the drawing, the sector gear 1 is fixed to the front side of the upper rail 61 with rivets 11 and 12 so that the gear portion 1A faces rearward. The drive pinion 7 meshed with the sector gear 1 is provided on a drive shaft 81 driven by a motor (drive source) M.

,
One of the left and right front lifter links 2 shown in the figure is pivotally attached to a drive shaft 81 provided on the seat cushion frame 5, but is attached to the seat cushion frame 5 at a different location from the drive shaft 81. You may attach to the provided spindle.
The other front lifter link (not shown) is pivotally attached to the other seat cushion frame opposite to the seat cushion frame 5 by a pin or the like.

The left and right front lifter links 2 are integrally connected by a connecting shaft 23, and the lower part is pivotally attached to the upper rail 61 by a pivot pin 2a. The left and right front lifter links 2 are integrally connected by a connecting rod 22, and the connecting rod 22 is disposed forward and above the shaft support portion of the left and right front lifter links 2 with respect to the seat cushion frame 5 such as the drive shaft 81 and the pin. Has been.
Therefore, the connecting rod 22 is disposed forward and upward with respect to the meshing position of the sector gear 1 and the driving pinion meshing with the sector gear 1.

  The connecting link 3 connected to the left and right rear lifter links 4 is connected to the connecting rod 22 described above. Further, the upper part of the left and right rear lifter links 4 is pivotally supported by a connecting shaft 41 that is pivotally supported by the left and right seat cushion frames 5, and the lower part is a pin 43 on the rear side of the upper rail 61. It is supported by.

  The left and right seat cushion frames 5 are provided with arc-shaped elongated holes 51 centering on the connecting rod 22 that forms the center of rotation. The connecting link 3 and the rear lifter link 4 are formed in the elongated holes 51. Are slidably inserted, and the pins 42 are supported by the left and right seat cushion frames 5 so as to improve the operability of the connecting link 3.

The drive pinion 8 can be rotated by a motor (drive source) M, and the motor M can be rotated forward and backward by a lift switch, and a brake mechanism and a reduction gear for maintaining the rotation only in a desired direction. It has.
Therefore, by driving the motor (drive source) M, the drive pinion 8 rotates and moves up and down while meshing with the gear portion 1A of the sector gear 1. Therefore, the seat cushion frame 5 can be moved up and down by the front and rear lifter links 2 and 4 that form parallel links.

  In FIG. 3, 20 and 24 are insertion holes of the pivot pin 2 a, 21 is a through hole through which the drive shaft 81 is passed, and 30 is a connection hole for connecting the connection link 3 to the connection rod 22.

The front and rear lifter links 2, 4 are pivotally supported by the seat cushion frame 5 on the seat cushion SC side at the upper end and pivotally supported by the pivot pins 2 a, 43 on the upper rail 61 on the vehicle body side. Yes. The pair of left and right front lifter links 2 can be synchronized with each other by a connecting shaft 23 extending horizontally.

    Accordingly, the connecting links 3 are pivotally supported by the front lifter link 2 and the L-shaped rear lifter link 4 so as to span each other. That is, the front end of the connection link 3 is located above the drive pinion 8 and is separated from the engagement position between the sector gear 1 and the drive pinion 8 by a dimension L1 (see FIG. 2) to connect the connection rod 22. The rear end of the connecting link 3 is supported by the upper end of the rear lifter link 6 by the shaft portion 10b.

    Further, the connecting links 3 are pivotally supported by the front lifter link 2 and the L-shaped rear lifter link 4 so as to span each other. That is, the front end of the connection link 3 is located above the drive pinion 8 and is separated from the engagement position between the sector gear 1 and the drive pinion 8 by a dimension L1 (see FIG. 2) to connect the connection rod 22. The rear end of the connecting link 3 is pivotally supported by a pin 42 on the upper end of the rear lifter link 6.

  Further, even when the seat cushion SC is lifted or lowered by the driving pinion 8, the engagement position between the sector gear 1 and the driving pinion 8 and the connecting rod 22 are always separated by the dimension L1, The connecting rod 22 is located in front of the meshing location between the sector gear 1 and the drive pinion 8.

  As shown in FIG. 1, in the case of a collision at the rear of the vehicle, such as a rear-end collision or a collision at the time of back travel, a so-called rear collision, the seat cushion SC is subjected to a rear downward load due to a large load applied to the seat back. F acts.

  Accordingly, on the front side of the seat cushion SC, the sector gear 1 and the driving pinion 8 are engaged with each other, and the driving pinion 8 is disposed behind the sector gear 1, so that the rear lifter link 4 is disposed at the time of a rear collision. Even if a heavy load is applied, the driving pinion 8 can function as a stopper, and the height position of the front side of the seat cushion SC can be maintained in the current state.

  The connecting links 3 are pivotally supported so as to span the front lifter link 2 and the rear lifter link 4, and the front end of the connecting link 3 is engaged with the sector gears 1, 5 </ b> A and the drive pinion 8. Since it is pivotally supported forward, the connecting link 3 can function as a stretch of the rear lifter link 4 that tends to fall backward due to a collision load.

  This makes it difficult for the rear lifter link 4 to fall backward, and the sinking phenomenon at the time of a rear collision of the seat cushion frame 5 can be appropriately prevented. In addition, when the impact load at the time of rear impact is larger than the input of the planned impact load, the pinion 7 on which the brake is applied may turn slightly.

  Further, since the impact load acting on the seat cushion is also transmitted to the seat cushion frame 5, the impact load can be effectively dispersed in both the seat cushion frame 5 and the connecting link 3.

  In addition, the thickness of the lifter link is increased, the prevention mechanism is provided to prevent the seat from sinking, and the height of the seat cushion side frame is increased to increase the rigidity of the seat cushion frame 5. Since the sheet can be prevented from sinking due to deformation of the lifter link or the like without taking measures such as ensuring a high level, the present invention can realize a reduction in size and weight of the sheet S. And by making the front side lifter link 2 itself a sector gear, the number of parts can be reduced and the cost can be reduced.

  It goes without saying that the present invention is not limited to the embodiment described above.

  For example, the front lifter link that is not on the drive source side is rotatably connected to the seat cushion frame on the opposite side of the seat cushion frame 5 with a pin. In this case, naturally, the pinion 8 is not adopted, and the front lifter link is attached to the connecting rod 22 and the connecting shaft 23.

  In addition, as a drive source, it is possible to adopt a manual rotation knob or operation lever equipped with a brake mechanism or a reduction gear for maintaining rotation only in a desired direction, and the rotation axis of the rotation knob or operation lever is It is connected to the drive pinion 7.

  S ... Vehicle seat, SC ... Seat cushion, 1 ... Sector gear 2 ... Front lifter link, 3 ... Connection link, 4 ... Rear lifter link 5 ... Seat cushion frame, 6 ... Slide rail, 7 ... Back frame, 8 ... Pinion.

Claims (1)

A pair of left and right front lifter links and a rear lifter link pivotally supported on the vehicle body side and the seat cushion side constitute a parallel link mechanism, and the height of the seat can be adjusted.
A sector gear is fixed to the front side of the vehicle body side, and a driving pinion meshed with the sector gear is arranged on the seat cushion side,
The connecting links are pivotally supported so as to span the front lifter link and the rear lifter link, and the front end of the connecting link is pivotally supported forward from the meshing position of the sector gear and the drive pinion. A vehicle seat characterized by that.