JP2019073114A - Vehicle seat - Google Patents

Abstract

To obtain a webbing take-up device which can inhibit inclination of a center axis of a rotary member.SOLUTION: In a vehicle seat 10, a load sensor 72 is provided between a seat pad 24 of a seat cushion 12 and a cloth spring body 28 of a cloth spring 26. Thus, the load sensor 72 and a load sensor 72 side portion of a wire harness 74 are provided between the seat pad 24 and the cloth spring 26, i.e., at the seat lower side of the seat pad 24. Thus, the load sensor 72 and the load sensor 72 side portion of the wire harness 74 do not pass through a groove 24B of the pad part 24A of the seat pad 24.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle seat.

  A seating sensor such as a load sensor is provided on the seat upper side of the cushion pad of the seat cushion, and there is a vehicle seat that can detect that the occupant is seated on the seat cushion (see Patent Document 1 below as an example). On the other hand, as a mounting structure of the surface cushion of the seat cushion to the cushion pad, a groove opened on the upper surface of the seat of the cushion pad is formed in the cushion and the surface is suspended inside the groove and connected to the cushion pad There is a configuration to be done. In such a configuration, when the seating sensor is provided on the seat upper side of the cushion pad, an electrical connection portion such as an electrical cord connected to the seating sensor passes inside the groove of the cushion pad. Also, in order to suppress friction between the cushion pad and the electrical connection portion inside the groove of the cushion pad, a protective member such as a protector is provided inside the groove, and the electrical connection portion passes through the inside of the protective member .

JP, 2015-003580, A

  An object of the present invention is to obtain a vehicle seat in which a load sensor can be provided without providing a special member such as a protective member in consideration of the above fact.

  The vehicle seat according to claim 1 is provided on a seat frame, and is provided on a cushion member that is elastically deformed by a load from one side in the thickness direction, and provided on the other side in the thickness direction of the cushion member. A cloth-like member supported by the frame and bent to the other side in the thickness direction by the load transmitted through the cushion member, and provided between the cloth-like member and the cushion member by the cloth-like member And a load sensor for detecting the load.

  According to the vehicle seat described in claim 1, the load sensor is provided between the cloth-like member and the cushion member and supported by the cloth-like member. For this reason, even if a groove for suspending the skin covering the cushion member is formed on the surface on one side in the thickness direction of the cloth-like member in the cushion member, an electrical connection such as a cord member connected to the load sensor The means may not be located inside the groove. Therefore, no special member such as a protective member is required to suppress the friction between the cushion member and the electrical connection inside the groove.

  As described above, in the vehicle seat according to claim 1, the load sensor can be provided without providing a special member such as a protective member.

1 is a schematic exploded perspective view of a vehicle seat according to an embodiment of the present invention. Fig. 2 is a cross-sectional view of the seat cushion taken along line 2-2 of Fig. 1; It is an exploded perspective view of a cloth spring.

<Configuration of the present embodiment>
Next, an embodiment of the present invention will be described based on FIGS. 1 to 3. In each of the drawings, the arrow FR indicates the front side (front side in the front-rear direction of the seat) of the vehicle seat 10 according to the embodiment of the present invention, and the arrow LH indicates the left side of the seat (the left side in the seat width direction). The arrow UP indicates the upper side of the sheet (upper side in the sheet vertical direction).

  As shown in FIG. 1, the vehicle seat 10 includes a seat cushion 12, a seat back 14, and a headrest 16. The seat cushion 12 constitutes a seat portion of the vehicle seat 10. Further, the seat back 14 constitutes a backrest portion of the vehicle seat 10, and the headrest 16 can support the head of the occupant S seated on the vehicle seat 10 from the seat rear side.

  The seat cushion 12 includes a cushion frame 18 as a seat frame, and the cushion frame 18 includes a front rod 20 as a rod. The front rod 20 has, for example, a cylindrical shape, and the longitudinal direction of the front rod 20 is in the sheet width direction (the arrow LH direction in FIG. 1 and the opposite direction). The front side rod 20 is provided on the seat front side portion of the seat cushion 12, and the side frames that constitute the cushion frame 18 together with the front side rod 20 Not shown), and both longitudinal ends of the front rod 20 are supported by the side frames.

  On the seat rear side of the front side rod 20, a rear side rod 22 as a rod that constitutes the cushion frame 18 together with the front side rod 20 is provided. The rear rod 22 has, for example, a cylindrical shape, and the longitudinal direction of the rear rod 22 is the sheet width direction (the direction of the arrow LH in FIG. 1 and the opposite direction). The rear side rod 22 is provided on the seat rear side portion of the seat cushion 12, and both longitudinal end sides (seat lateral direction end sides) of the rear side rod 22 are supported by the above-described side frame.

  Further, as shown in FIG. 1, the seat cushion 12 is provided with a seat pad 24. As shown in FIG. 2, the seat pad 24 includes a pad portion 24A as a cushion member. The pad portion 24A is formed in a thick plate shape, for example, by an elastic synthetic resin material or the like such as polyurethane foam, and is covered by the skin 25. Further, a groove 24B is formed in the sheet upper side portion of the pad portion 24A. The longitudinal direction of the groove 24B is, for example, the sheet width direction (the direction of the arrow LH in FIG. 1 and the opposite direction thereof), and is opened toward the upper side of the sheet. Inside the groove 24B, a part of the skin 25 is contained, and the skin 25 is held suspended inside the groove 24B by a holding member (not shown).

  On the other hand, as shown in FIGS. 1 and 2, the seat cushion 12 is provided with a cloth spring 26. As shown in FIG. 3, the cloth spring 26 includes a cloth spring body 28 as a cloth-like member. The cloth spring main body 28 is, for example, in the form of a thin sheet, and is formed of a cloth material having elasticity such as an elastic fabric.

  At a vehicle front end portion as a rod side end portion of the cloth spring main body 28, a first front cylindrical portion 30 and a second front cylindrical portion 32 are formed as a connecting portion. The first front side tubular portion 30 is formed in a tubular shape opened at both sides in the seat width direction, and the seat width direction right side than the seat width direction center side portion at the vehicle front end of the cloth spring main body 28 (FIG. It is provided on the side opposite to the direction of the arrow LH). On the other hand, the second front side tubular portion 32 has a tubular shape opened at both sides in the seat width direction, and the seat width direction than the seat width direction center portion at the vehicle front end of the cloth spring main body 28 It is provided apart from the first front side tubular portion 30 on the left side (arrow LH direction side in FIG. 3).

  On the other hand, a first rear cylindrical portion 34 and a second rear cylindrical portion 36, each serving as a connecting portion, are formed at the vehicle rear end portion as the rod side end portion of the cloth spring main body 28. . The first rear side cylindrical portion 34 has a cylindrical shape opened at both sides in the seat width direction, and is provided on the right side in the seat width direction than the central portion in the seat width direction at the vehicle rear end of the cloth spring main body 28 It is done. On the other hand, the second rear side tubular portion 36 has a tubular shape opened at both sides in the seat width direction, and the seat width direction center portion of the cloth spring main body 28 at the vehicle rear side end portion is closer to the seat. It is provided apart from the first rear side cylindrical portion 34 on the left side in the width direction.

  In addition, the cloth spring 26 includes a pair of front hooks 38 and a pair of rear hooks 40 each serving as a connecting member. The front hook 38 comprises a front connecting rod 42. The front connection rod 42 is formed in a rod shape by a metal such as iron or a relatively hard synthetic resin material. The longitudinal direction of the front side communication rod 42 is the sheet width direction, and the front side communication rod 42 of one front side hook 38 is disposed in a state of penetrating the first front side cylindrical portion 30 of the cloth spring main body 28, The front connection rod 42 of the front hook 38 is disposed in a state of penetrating the second front cylindrical portion 32 of the cloth spring main body 28.

  Further, the front side communication rod 42 is provided with a first front hook portion 44 and a second front hook portion 46 as engaging portions. The first and second front hooks 44 and 46 are formed in a substantially U-shaped rod shape. Of the longitudinal ends of the first front hook portion 44, one longitudinal end of the first front hook portion 44 located on the upper side of the seat with the opening direction of the first front hook portion 44 facing the seat rear side is front communication It is connected to one longitudinal end of the rod 42.

  Further, among longitudinal ends of the second front hook portion 46, one longitudinal end of the second front hook portion 46 located on the upper side of the seat with the opening direction of the second front hook portion 46 facing the seat rear side is It is connected to one longitudinal end of the front connecting rod 42. The first and second front hooks 44 and 46 are engaged with the front rod 20 so that the front rod 20 of the cushion frame 18 is disposed inside the first and second front hooks 44 and 46. There is. As a result, the first and second front hooks 44 and 46 (i.e., the front hook 38, and more specifically, the first front cylindrical portion 30 and the second front cylindrical portion 32 of the cloth spring main body 28) The front rod 20 is supported rotatably around a central axis (center) of 20.

  On the other hand, the rear hook 40 is provided with the rear communication rod 50. The rear connection rod 50 is formed in a rod shape by a metal such as iron or a relatively hard synthetic resin material. The longitudinal direction of the rear side communication rod 50 is the sheet width direction, and the rear side communication rod 50 of one rear side hook 40 penetrates the first rear side cylindrical portion 34 of the cloth spring main body 28. The rear communication rod 50 of the other rear hook 40 is disposed so as to pass through the second rear cylindrical portion 36 of the cloth spring main body 28.

  Further, the rear communication rod 50 is provided with a first rear hook portion 52 and a second rear hook portion 54 as engaging portions. The first and second rear hooks 52 and 54 are formed in a substantially U-shaped rod shape. Furthermore, among longitudinal ends of the first rear hook portion 52, the longitudinal direction of the first rear hook portion 52 positioned on the upper side of the sheet in a state in which the opening direction of the first rear hook portion 52 faces the seat rear side. One end is connected to one longitudinal end of the rear connection rod 50.

  Further, of the longitudinal ends of the second rear hook 54, the longitudinal direction of the second rear hook 54 positioned on the upper side of the seat with the opening direction of the second rear hook 54 directed to the rear of the seat. One end is connected to one longitudinal end of the rear connection rod 50. These first and second rear hooks 52, 54 are connected to the rear rod 22 such that the rear rod 22 of the cushion frame 18 is disposed inside the first and second rear hooks 52, 54. It is engaged. Thereby, the first and second rear hooks 52, 54 (i.e., the rear hook 40, more specifically, the first rear cylindrical portion 34 and the second rear cylindrical portion 36 of the cloth spring body 28) Is rotatably supported by the rear rod 22 around a central axis (center) of the rear rod 22.

  As shown in FIGS. 1 and 2, a load sensor 72 is provided on the seat upper side of the cloth spring main body 28 of the cloth spring 26. The load sensor 72 is, for example, in the form of a sheet, and the thickness direction of the load sensor 72 is generally in the vertical direction of the sheet. As shown in FIG. 2, the load sensor 72 is sandwiched between the cloth spring body 28 and the seat pad 24 and is supported by the cloth spring body 28 from the underside of the seat. The load sensor 72 can detect the load F from the upper side of the seat.

  A wire harness 74 as an electrical connection member is provided on the seat rear side of the load sensor 72. One end of the wire harness 74 is connected to the rear end of the load sensor 72, and the wire harness 74 is electrically connected to the load sensor 72. Also, the other side of the wire harness 74 extends to the back side of the seat, and the other end of the wire harness 74 directly to the control device (not shown) or indirectly via another electrical connection member. It is connected. The control device is electrically connected to an air bag device (not shown) of the vehicle to which the vehicle seat 10 is applied.

<Operation and effect of the present embodiment>
When a vehicle occupant S (see FIG. 2) is seated on the vehicle seat 10, the pad portion 24A of the seat pad 24 of the seat cushion 12 is elastically deformed by the load F from the upper side of the seat based on the weight of the occupant S and the like. . Further, the load F applied to the seat pad 24 acts on the cloth spring main body 28 of the cloth spring 26 via the seat pad 24. As a result, the cloth spring main body 28 is bent so that the sheet longitudinal direction intermediate portion of the cloth spring main body 28 expands downward. The body of the occupant S is displaced to the seat lower side as the cloth spring main body 28 bends to the seat lower side. Thus, when the tension in the seat longitudinal direction of the cloth spring main body 28 and the load F balance with each other, the bending or the like of the cloth spring main body 28 is further suppressed, and the vehicle seat 10 is The displacement of the body of the seated occupant S to the lower side of the vehicle is suppressed.

  On the other hand, when the load F is applied to the seat pad 24 as described above, the load F is applied to the load sensor 72 provided between the seat pad 24 and the cloth spring main body 28 of the cloth spring 26. As described above, when the load F is detected by the load sensor 72, a load detection signal of a signal level (for example, voltage) corresponding to the magnitude of the load F is output from the load sensor 72. The load detection signal output from the load sensor 72 is input to the control device. In the control device, it is determined based on the load detection signal whether or not the load F is equal to or greater than a predetermined magnitude, and when the control device determines that the load F is greater than a predetermined magnitude, the control device The air bag system is made operational, for example, in the event of a vehicle collision, the air bag system is activated.

  Here, in the present embodiment, the load sensor 72 and the load sensor 72 side portion of the wire harness 74 are provided on the cloth spring main body 28 of the cloth spring 26. As described above, when the cloth spring main body 28 is bent by the load F and the tension in the seat longitudinal direction of the cloth spring main body 28 and the above load F are balanced, the bending or the like of the cloth spring main body 28 is further suppressed. . Therefore, in this state, the load sensor 72 is supported by the cloth spring main body 28 from the lower side of the sheet, and the displacement of the load sensor 72 to the lower side of the sheet is suppressed. Thus, even if the load sensor 72 is not supported from the lower side of the seat by a special member other than the cloth spring 26, the load sensor 72 can detect the load F.

  Further, the load sensor 72 and the load sensor 72 side portion of the wire harness 74 are provided between the seat pad 24 and the cloth spring 26, that is, below the seat of the seat pad 24. Therefore, the load sensor 72 and the load sensor 72 side portion of the wire harness 74 do not pass through the groove 24 B of the pad portion 24 A of the seat pad 24. For this reason, when the wire harness 74 is disposed inside the groove 24B, a protective member such as a protector for preventing or suppressing the wire harness 74 from coming into direct contact with the inner portion of the groove 24B in the pad portion 24A. It is not necessary to provide a special member such as.

  Further, the above-mentioned protective member is formed of, for example, a relatively hard synthetic resin material. Therefore, through holes (not shown) are formed in the portion where the protective member is disposed in the groove 24B. The through hole is a hole penetrating in the vertical direction of the sheet, and the protective member is in the vertical direction of the sheet when the load F applied to the seat pad 24 from the upper side of the sheet is large by forming the through hole in the pad portion 24A I was able to move in the direction. Moreover, assuming that the protective member moves downward in the sheet and a part of the protective member is protruded lower than the sheet lower side surface of the pad portion 24A, the pad of the cloth spring main body 28 of the cloth spring 26 A hole must be formed in the portion of the lower surface of the seat of the portion 24A opposite to the projecting portion of the protective member to prevent interference with one of the protective member and the cloth spring main body 28 with respect to the other.

  However, in the present embodiment, as described above, since it is not necessary to provide the protection member, it is not necessary to form the through hole for enabling the movement of the protection member in the sheet vertical direction in the pad portion 24A. . Moreover, since the protection member does not protrude from the sheet lower side surface of the pad portion 24A, the cloth spring main body 28 may not have the hole for preventing the interference of the protection member. As a result, it is possible to prevent or suppress the deterioration of the performance of the cloth spring main body 28 (the cloth spring 26) such as the deterioration of the durability of the cloth spring main body 28 (the cloth spring 26).

  The cloth spring main body 28 of the cloth spring 26 in the present embodiment is formed of a cloth material having elasticity such as an elastic cloth. However, the cloth spring main body 28 may be, for example, in the shape of a net (net), and the cloth spring main body 28 is in the form of a thin sheet having elasticity that can be bent in its thickness direction. Good.

  Further, in the present embodiment, the cloth spring main body 28 of the cloth spring 26 is connected to the front rod 20 and the rear rod 22 via the front hook 38 and the rear hook 40. However, the front rod 20 and the rear rod 22 may be provided with a configuration for supporting the seat front end and the seat rear end of the cloth spring main body 28, and the cloth spring main body 28 may be a front rod 20 and a rear rod. 22 may be directly supported. That is, the seat front end of the cloth spring main body 28 may be directly or indirectly connected to the front rod 20 so as to be rotatable about the central axis of the front rod 20, and the seat rear end of the cloth spring main 28 May be connected directly or indirectly to the rear rod 22 rotatably around the central axis of the rear rod 22.

  Furthermore, in the present embodiment, the seat front end and the seat rear end of the cloth spring main body 28 are configured to be supported by the front rod 20 and the rear rod 22 (that is, the cushion frame 18). However, for example, both ends in the seat width direction of the cloth spring main body 28 may be supported on both sides in the seat width direction of the cushion frame 18.

  Furthermore, the present embodiment has a configuration in which the present invention is applied to the seat cushion 12. However, the present invention may be applied to a configuration in which the cloth spring 26 is provided on the seat back 14.

10 Vehicle seat 18 Cushion frame (seat frame)
24A pad part (cushion member)
26 Cloth spring (cloth-like member)
72 Load sensor F load

Claims (1)

A cushion member provided on the seat frame and elastically deformed by a load from one side in the thickness direction;
A cloth-like member which is provided on the other side in the thickness direction of the cushion member and supported by the seat frame, and is bent to the other side in the thickness direction by the load transmitted through the cushion member;
A load sensor provided between the cloth-like member and the cushion member, supported by the cloth-like member, and detecting the load;
Vehicle seat provided with