JP2518527Y2 - Vehicle seat device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vehicle seat device.

(Prior Art) Generally, in a vehicle seat device, a seat cushion fixed to a vehicle body side and a seat back mounted at a rear end portion of the seat cushion so as to be tiltable in the front-rear direction are provided. In order to provide a reclining function to the seat cushion, the seat back is tiltably supported in the front-rear direction in one of the left and right connecting portions of the seat cushion and the seat back, and the seat back is supported at a desired tilting position. The knuckle for holding the position is usually of a so-called one-sided knuckle system in which the other connecting portion is simply provided with a hinge for supporting the seat back so that the seat back can be tilted in the front-rear direction (for example, the actual opening).
60-155350 gazette).

By the way, in such a one-sided knuckle type seat device, when a load that pushes the seat back backward is applied to the seat back, the knuckle part is restricted from tilting afterward by the knuckle, but Since there is nothing for restricting the rearward inclination in the portion, the frame of the seat back bends between the knuckle side and the hinge side to cause torsional deformation, and the portion of the seat back near the hinge side is easily displaced rearward. However, such a torsional deformation amount of the seat back is not preferable because if it is too large, the restraint performance for the occupant is impaired, and therefore, the torsional deformation amount of the seat back is equal to or less than a certain value under a predetermined load load condition. It is legally obligatory to design the strength of the seat back so that

In a one-sided knuckle type seat device, as a method of clearing such a regulation value of the torsional deformation amount of the seat back, it is generally considered to increase the frame strength itself of the seat back. It is not a good idea because it increases the weight of the device.

Under such circumstances, a so-called double-sided knuckle type seat device having knuckles on both left and right connecting portions of the seat cushion and the seat back has already been proposed (for example, see Japanese Utility Model Publication No. 61-30535).

(Problems to be solved by the invention) However, in such a double-sided knuckle type seat device, not only is it very difficult to synchronize the left and right knuckles, but also the strength of the frame is increased. Although not as much as the case, the weight is increased due to the attachment of the knuckle, and the knuckle is relatively expensive in the first place, which leads to an increase in cost, and this is also not an effective means.

In view of this, the present invention has an object to enable a one-sided knuckle type vehicle seat device to effectively control twist deformation of a seat back while suppressing cost increase and weight increase with a simple configuration as much as possible. It was made.

(Means for Solving the Problem) As a concrete means for solving the above problems, the present invention provides a seat cushion fixedly arranged on the vehicle body side, and a seat back whose lower end is connected to the seat cushion. Of the pair of left and right connecting portions of the seat cushion and the seat back, one of the connecting portions supports the seat back so as to be tiltable in the front-rear direction with respect to the seat cushion. In a vehicle seat device, which is provided with a knuckle capable of holding the position in a tilted position, and the other connecting portion is provided with a hinge for supporting the seat back so as to be tiltable in the front-rear direction of the seat cushion, A latch gear fixed to the seat cushion side is attached to the other connecting portion, and swingable to the seat back side. Of the seat cushion and a portion of the seat cushion that is close to the other connecting portion are provided on one side. Is provided with a rearward tilt restricting device including a meshing restricting mechanism that allows the claw member to mesh with the latch gear only when the claw member is relatively displaced rearward by a predetermined amount or more with respect to a portion near the connecting portion. .

(Operation) Since the present invention has such a configuration, when a load is applied to the seat back and the seat back bends between the knuckle side and the hinge side and is twisted and deformed, when the twisted deformation amount is less than or equal to a predetermined value. In this case, the rearward lean restricting device is deactivated, and the load applied to the seat back is supported by only one knuckle (one-side knuckle type state).

On the other hand, if the amount of twist deformation exceeds a predetermined value,
Since the rearward tilt restricting device operates and its claw member meshes with the latch gear, the load applied to the seat back is supported by both the knuckle and the rearward tilt restricting device, and further twist deformation of the seat back is caused. Will be prevented (state of knuckle system on both sides).

(Effect of the Invention) Therefore, according to the vehicle seat device of the present invention, although the knuckle is provided on only one side of the left and right connecting parts, the seat device of the one-sided knuckle system is provided, but the frame strength is significantly increased. Without restraint, the amount of twist deformation of the seat back can be suppressed to a predetermined value or less to improve the restraint performance of the occupant. Since it is a structure that regulates the twisting deformation of the back, it is not necessary to synchronize the left and right knuckles as in a seat device of a double-sided knuckle system, for example, manufacturing can be facilitated, which can contribute to cost reduction. Since the knuckle is replaced by a rearward tilting restraining device having an inexpensive structure, compared with the case of a double-sided knuckle type seat device, for example, a seat device It is possible to obtain practically extremely useful effects such as weight reduction and cost reduction.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

First Embodiment FIG. 1 shows a main part of a seat frame 1 of a vehicle seat device according to a first embodiment of the present invention. In FIG. 1, reference numeral 2 is a cushion frame constituting a seat cushion. Therefore, the cushion frame 2 is fixed to the vehicle body side through a slide mechanism (not shown). Further, plate-shaped cushion-side first connecting brackets 22 and cushion-side second connecting brackets 23 are respectively provided on both sides of the rear end of the cushion frame 2 with fixing bolts.
It is fastened and fixed by 40, 40.

Reference numeral 3 is a back frame which constitutes a seat back, and the back frame 3 has a frame body 31 formed by bending a pipe into a rectangular shape. And this frame
Frame body mounting brackets 32 and 33 are welded and fixed to the lower positions on both the left and right sides of 31, respectively. Furthermore, the frame-side mounting brackets 32, 33 are respectively provided with a plate-shaped back side first connecting bracket 34 and a back side second connecting bracket.
35 and 35 are fastened and fixed by fixing bolts 41, 41, respectively.

Then, the cushion frame 2 and the back frame 3 mutually connect the cushion-side first connecting bracket 22 and the back-side first connecting bracket 34, and the cushion-side second connecting bracket 23 and the back-side second connecting bracket 35, respectively. It is integrated by rotatably connecting, but in this case, in this embodiment, the left side connecting portion
In 1a, a knuckle 4 having a known structure (detailed description of the structure is omitted) is provided, and the knuckle 4 connects the both so as to be relatively rotatable and to hold the position of the cushion frame 2 in a required tilted position. ing. On the other hand, in the right side connecting portion 1b, as shown in FIG. 1 and FIG. 2, the both are simply rotatably connected to each other by the hinge 5 constituted by the hinge pin 51 (that is, in this embodiment). Is a so-called one-sided knuckle system).

In this way, the cushion frame 2 and the back frame 3
The back frame 3 (that is, the seat back) is connected to the cushion frame 2 (that is, the seat cushion) by connecting the back frame 3 (that is, the seat cushion) with the knuckle 4 at the left side connecting portion 1a and the hinge 5 at the right side connecting portion 1b. On the other hand, the back frame 3 can be tilted in the front-back direction, and the back frame 3 can be held at a desired tilt position by operating the knuckle 4 with the knuckle operating lever 4a (that is, reclining). Have a function).

Further, in this embodiment, by applying the present invention,
A rearward tilt restricting device 6 described later is provided on the right connecting portion 1b side to secure a back frame rigidity comparable to a double-sided knuckle type seating device, though it is a one-sided knuckle type seating device and does not significantly increase the frame strength. I am able to do so.

As shown in FIGS. 1 to 3, the rearward tilt restricting device 6 includes a rod 61, a lever 62, a gear plate 67, and a claw member, which will be described later.
It consists of 64. The rod 61 is composed of a straight shaft body slightly longer than the width dimension of the back frame 3, and is arranged with its axis aligned with the rotation axis connecting the knuckle 4 and the hinge 5. One end 61a of the rod 61 is welded and fixed to the inside of the back-side first connecting bracket 34 in a butting state. Also, the rod
The other end 61b of 61 passes through a rod hole 52 provided at the axial center position of the hinge pin 51 and is projected to the outside of the cushion-side second connecting bracket 23. The lever 62 having an engaging pin 63 projecting from the tip thereof is fixed to the other end 61b of the rod 61 protruding outward from the cushion-side second connecting bracket 23.

The gear plate 67 is integrally formed of a substantially fan-shaped plate material. A latch gear 68 is formed on the outer peripheral surface of the gear plate 67, and a pin hole 69 is formed in the fan-shaped center position.
Are formed. The gear plate 67 is fastened and fixed to the inside of the cushion side second connecting bracket 23 by the fixing pins 43 and 43 with the hinge pin 51 fitted in the pin hole 69 and the latch gear 68 facing upward. Has been done.

The claw member 64 is provided on the back side second connecting bracket 35.
To the vertical direction by the fulcrum pin 42 (arrow U- in FIG. 3).
The plate member is swingably supported in the D direction), and the swing end side 64a thereof has an engaging pawl 65 capable of meshing with the latch gear 68 of the gear plate 67 and the lever 62. And a guide groove 66 into which the engaging pin 63 can be engaged. The guide groove 66 is appropriately inclined so that the claw member 64 gradually moves away from the gear plate 67 from the fulcrum pin 42 side toward the tip portion 64a side.

Then, in the assembled state of the backward tilt control device 6,
The engaging pin of the lever 62 is inserted into the guide groove 66 of the claw member 64.
63 is slidably engaged, and the relative mounting positional relationship between the claw member 64 and the lever 62 (that is, the rod 61) is set as follows. That is, as shown by solid lines in FIGS. 1 and 3, when the back frame 3 is hardly twisted and deformed, the back side first connecting bracket 34 and the back side second connecting bracket 35 are in substantially the same phase position. The engaging pin 63 is attached to the base end portion 66b of the guide groove 66.
And the engaging claw 65 of the claw member 64 is separated from the latch gear 68 of the gear plate 67 (in the following description,
The position of the claw member 64 at this time is referred to as an upward movement position), and as shown by the chain line in each of the drawings, the back frame 3 has a right side portion 31b of the frame body 31 rearward of the left side portion 31a by a predetermined amount. In the retracted and twisted state, the above engagement pin
63 is positioned at the tip portion 66a of the guide groove 66, the claw member 64 rotates in the direction of arrow D, and the engaging claw 65 meshes with the latch gear 68 (in the following description, the position of the claw member 64 at this time). Is referred to as the down position). When the latch gear 68 of the gear plate 67 of the engaging claw 65 of the claw member 64 is meshed with each other, the back side second
The connecting bracket 35 (that is, the right side portion 31b of the frame 31) is restricted from further moving to the rear side (arrow A side).

In the seat device including the rearward tilt restricting device 6 configured as described above, when the load applied to the seat back is relatively small and the amount of twist deformation thereof is equal to or less than a predetermined value, the claw member 64 of the rearward tilt restricting device 6 is Since the position is maintained in the upper moving position, the rearward tilt restricting device 6 is in an inoperative state, the load is supported only by the knuckle 4, and further rearward tilt displacement of the seat back is restricted (that is, In this case, the seat device operates similarly to the one-sided knuckle seat device).

On the other hand, if the load applied to the seat back increases and the amount of twist deformation of the seat back exceeds a predetermined value,
Engagement pin fixed to the back side first connection bracket 34 side
63 and the claw member 64 fixed to the back side second connecting bracket 35 side are relatively displaced. As a result, the engagement pin 63 moves from the base end portion 66b side to the tip end portion 66a side of the guide groove 66, whereby the pawl member 64 is switched from the upper moving position to the lower moving position, and the engaging pawl 65 is formed. Engages with the latch gear 68 of the gear plate 67 to prevent further backward movement of the back side second connecting bracket 35 (that is, further torsional deformation of the seat back) (that is, in this case, the seat device is Acts the same as the knuckle type seat device on both sides).

When the load applied to the seat back is reduced or eliminated in a state where the rearward tilt restricting device 6 is operated and the twist deformation amount of the seat back becomes smaller than the predetermined value, the engagement pin The claw member 64 is returned to the upper moving position by the movement of the guide groove 66 in the guide groove 66 from the tip end portion 66a side to the base end portion 66b side, and the seat device is automatically set to the one-sided knuckle state.

Further, when the reclining operation is performed by the knuckle operation lever 4a, the lever 62 and the claw member 64 move integrally with the tilt of the back frame 3 while maintaining the relative positional relationship. There is no effect.

As described above, in this seat device, even though it is a one-sided knuckle type seat device due to its structure, the backward tilt displacement amount due to the torsional deformation of the seat back is double-sided knuckle system without any particular increase in frame strength. The seat device can be maintained at about the same level as the seat device. Further, as described above, the rearward tilt restricting device 6 which is simpler in structure, lighter in weight and cheaper than the knuckle suppresses the torsional deformation of the seat back. Also, the weight can be reduced.

Further, since the rearward tilt restricting device 6 automatically operates when the amount of twist deformation of the seat back exceeds a predetermined value and prevents further twist deformation, for example, in a seat device of a double-sided knuckle system. As in the case, extremely difficult synchronism of the left and right knuckles is not required, and the knuckle can be easily manufactured correspondingly, which also contributes to cost reduction.

Second Embodiment FIG. 4 shows a seat frame 1 of a vehicle seat device according to a second embodiment of the present invention. In this embodiment, only a part of the configuration of the rearward tilt restricting device 6 is different from that in the first embodiment, and the other parts are the same as those in the first embodiment. Therefore, the description thereof will be omitted, and here, only the backward tilt control device 6 will be described.
In particular, the description will focus on the parts different from the first embodiment.

The rearward tilt restricting device 6 is the same as in the first embodiment.
61, a lever 62, a gear plate 67, and a claw member 71. As in the first embodiment, the rod 61 is arranged with its axis aligned with the rotation axis connecting the knuckle 4 and the hinge 5, and the other end 61b is passed through the hinge pin 51 so as to pass through the cushion side. Unlike the case of the first embodiment, the mounting position of the one end 61a of the second connecting bracket 23 is projected to the outside of the second connecting bracket 23, and is fixed to the lower side portion 31c of the frame body 31 by welding as close as possible to the knuckle 4. are doing. This is because even if the frame body 31 is flexibly deformed by the load, if the frame body 31 is in a position close to the back side first connecting bracket 34, the frame body 31 is hardly affected by the flexural deformation of the frame body 31 and This is because it is considered that the same effect as when directly attached to the 1-connection bracket 34 can be obtained.

The lever 62 has a tip portion bent to form an engaging portion 62a, and is fixed to the other end portion 61b of the rod 61. Then, an engaging portion 72 of a claw member 71, which will be described later, is engaged with the engaging portion 62a.

The claw member 71 is integrally formed of a substantially L-shaped plate material, and its bent portion is supported by the back side second connecting bracket 35 by a fulcrum pin 42. Further, the engaging portion 72 and the gear plate 67 are provided on one end side of the claw member 71.
Of the latch gear 68 (the gear plate 67 has the same structure as that of the first embodiment) is formed with an engaging claw 73, and a spring 74 is attached to the other end side. The pawl member 71 is constantly urged by the spring 74 in the direction (arrow R direction) in which the engaging portion 72 approaches the engaging portion 62a of the lever 62.

When the back frame 3 is not twisted and deformed as shown by the solid line in FIG. 4, the claw member 71 and the lever 62 are engaged with each other by the engaging portion 72 of the claw member 71 and the engaging portion 62a of the lever 62. Are engaged with each other, and the engaging claw 73 and the latch gear 68 are separated from each other (that is, the backward tilt restricting device 6 is in an inoperative state). Further, when the back frame 3 is twisted and deformed by a predetermined value or more as shown by a chain line, the engaging portion 72 and the lever 62 are displaced in the separating direction from each other, whereby the engaging portion 72 of the claw member 71 and the lever 62 are separated from each other. The engagement state with the engagement portion 62a is released, the claw member 71 is rotated in the R direction by the spring force of the spring 74, the engagement claw 73 meshes with the latch gear 68, and the back frame 3 is further extended. The twisting deformation of the is regulated.

Therefore, also in the seat device of this embodiment, the first
The same effect as that of the embodiment can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat back frame portion of a vehicle seat device according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of a portion II of FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is a perspective view of the seat back frame portion of the vehicle seat device according to the second embodiment of the present invention. 1 …… Seat frame 2 …… Cushion frame 3 …… Back frame 4 …… Knuckle 5 …… Hinge 6 …… Backward tilt control device 51 …… Hinge pin 61 …… Rod 62 …… Lever 63 …… Engaging pin 64… … Claw member 65 …… Engagement claw 66 …… Guide groove 67 …… Gear plate 68 …… Latch gear 71 …… Claw member 72 …… Engagement part 73 …… Engagement claw 74 …… Spring

Claims (1)

(57) [Scope of utility model registration request] 1. A seat cushion fixedly arranged on the vehicle body side, and a seat back having a lower end portion connected to the seat cushion, and a pair of left and right connecting portions of the seat cushion and the seat back. One of the connecting portions is provided with a knuckle that supports the seat back so as to be tiltable in the front-rear direction with respect to the seat cushion and that can hold the seat back at an arbitrary tilt position, and the other connecting portion. Is a seat device for a vehicle, each of which is provided with a hinge for supporting the seat back with respect to the seat cushion so as to be tiltable in the front-rear direction, and the other connecting portion is a latch gear fixed to the seat cushion side. Is swingably supported on the seat back side and meshes with the latch gear to provide a shift. A claw member having an engaging claw for restricting the rearward tilt of the tuck further, and a portion of the seat cushion closer to the other connecting portion relative to the one connecting portion closer relative to the rear side by a predetermined amount or more. A vehicle seat device comprising: a rearward tilt restricting device including a meshing restricting mechanism that allows the claw member to mesh with the latch gear only in the case of the above.