JP2012148720A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat that defends an occupant at the rear end collision while reducing the number of parts with a simple structure at a low production cost.SOLUTION: The vehicle seat includes: a seat cushion to be arranged on a floor of the vehicle; a seat back turnably supported by the seat cushion via a pair of hinge brackets 15; a reclining mechanism 13 that regulates a turning angle of this seat back; and a headrest coupled with the upper part of the seat back. In this vehicle seat, a reclining rod 14 that is inserted to a side frame 25 of seat back side, and a hinge bracket 15 provided at both sides of the seat back in the vehicle width direction, is provided. A through-hole 50 is penetrated in a center in the vehicle width direction of this reclining rod 14 to the direction where the occupant on the seat cushion relatively moves to the vehicle at the rear end collision of the vehicle.

Description

  The present invention relates to a seat cushion placed on the floor of a vehicle, a seat back that is rotatably supported by the seat cushion via a pair of hinge brackets, and a reclining mechanism that adjusts the rotation angle of the seat back. And a vehicle seat including a headrest connected to an upper portion of the seat back.

  Conventionally, in this type of vehicle seat, a vehicle seat having a so-called active headrest mechanism in which a headrest comes out forward and supports the head at the time of rear-end collision of the vehicle is known (for example, see Patent Document 1). ). In such an active headrest mechanism, the inner frame is pushed backward by the back of the occupant who sinks into the seatback at the time of a rear collision, and the headrest is moved forward.

  Further, as in Patent Document 2, a vehicle seat is known in which a cross member having an impact absorbing function is disposed at a lower portion of a seat back frame of a seat back. In this vehicle seat, the cross member is inserted into the outer pipe so as to be slidable into the outer pipe and the cantilevered outer pipe, which is divided into right and left and the outer terminal is fixed to the side frame. When an impact is applied to the seat back, the outer pipe moves so as to spread left and right and bends backward, and the inner pipe slides within the outer pipe, so that the cross member is predetermined. It is designed to bend and deform toward the rear side of the stroke amount.

JP 2010-47068 A Japanese Patent Laid-Open No. 11-278128

  However, in the vehicle seat of Patent Document 1, there are many dedicated parts for the active headrest mechanism, which contributes to an increase in manufacturing cost and mass. Therefore, there is a need to alleviate the uncomfortable feeling given to the occupant's cervical vertebra at the time of rear collision without providing an active headrest mechanism.

  Moreover, in patent document 2, there exists a problem that a cross member is a double structure of an inner pipe and an outer pipe, and there are many parts and it is inferior to assemblability.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle seat that protects an occupant during a rear-end collision with a simple structure and low manufacturing cost while reducing the number of parts. There is.

  In order to achieve the above object, in the present invention, a weak portion having a simple structure is provided on a reclining rod disposed on a waist portion of an occupant.

  Specifically, in the first invention, a seat cushion placed on a vehicle floor, a seat back rotatably supported by the seat cushion via a pair of hinge brackets, and a rotation of the seat back. A vehicle seat including a reclining mechanism for adjusting a moving angle and a headrest connected to an upper portion of the seat back is an object.

The reclining mechanism includes a reclining rod inserted into a seat back side frame and a hinge bracket provided on both sides of the seat back in the vehicle width direction,
A through hole is penetrated in the vehicle width direction center of the reclining rod in a direction in which an occupant on the seat cushion moves relative to the vehicle at the time of rear-end collision of the vehicle.

  According to the above configuration, the reclining rod is provided with a through hole in the direction in which the occupant on the seat cushion moves relative to the vehicle at the time of the rear impact of the vehicle, and the load is applied to the occupant at the time of the rear impact. By bending, the impact on the occupant is reduced and the through hole is only provided, so the number of parts does not increase and the number of assembly steps does not increase. Moreover, even if the reclining rod is provided with a through hole, the rotational torque applied to one end can be transmitted to the other end, so that the function as the reclining rod is not impaired.

In the second invention, in the first invention,
The reclining rod consists of a hollow round pipe,
The through hole passes through the hollow portion in the horizontal direction.

  According to said structure, while a reclining rod is comprised with a hollow round pipe and it aims at weight reduction, the function as a weak part and a torque transmission function can be made compatible by making the direction of a through-hole appropriate. Further, since the through hole is formed by passing through the hollow portion of the round pipe, the reclining rod can be reliably bent from the through hole portion by a simple method.

  As described above, according to the present invention, the through hole is formed in the vehicle width direction center of the reclining rod in the direction in which the occupant on the seat cushion moves relative to the vehicle at the time of rear collision of the vehicle. For vehicles with low manufacturing costs and a simple structure while reducing the number of parts, the reclining rod can be reliably bent from the through-hole portion at the time of rear impact to reduce the impact applied to the passenger and protect the passenger at the time of rear impact. A sheet is obtained.

It is a perspective view which expands and shows the reclining rod concerning the vehicle seat of this embodiment, and its periphery. It is a perspective view which shows a vehicle seat. It is a perspective view which shows the frame | skeleton of a vehicle seat. It is the expansion perspective view which looked at the frame of the vehicular seat from the lower left side. It is the expansion perspective view which looked at the lower left side of the frame of the vehicular seat from the upper part. It is an enlarged side view of the lower left side of the frame | skeleton of a vehicle seat which shows a mode that protrusion protrudes against a stopper. It is a side view which shows simply the positional relationship of a crew member's head and a headrest.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 shows a vehicle seat 1 according to an embodiment of the present invention. The vehicle seat 1 is installed on the vehicle body floor F so that an occupant P (shown in FIG. 7) is seated inside the vehicle, and constitutes a seat surface with a seat back 1a serving as a backrest of the occupant P. A seat cushion 1b and a headrest 1c, which is positioned above the seat back 1a and is connected to the seat back 1a so as to be adjustable in height up and down, are provided. The vehicle seat 1 is slidably adjustable in the vehicle front-rear direction by a pair of left and right slide rails 10 fixed in the vehicle body floor F and extending in the vehicle front-rear direction. In addition, the vehicle seat fixed to the vehicle body floor F without providing the slide rail 10 may be used.

  As shown in FIG. 3, the vehicle seat 1 includes a substantially gate-shaped seat back frame 2 that forms a skeleton of a seat back 1 a, an upper frame 3 that forms a skeleton of a seat cushion 1 b, and a lower portion of the upper frame 3. A skeleton is formed by a lower frame 4 having a substantially L-shaped cross section provided so as to correspond thereto. Between the upper frame 3 and the lower frame 4, a pair of a front link 5a and a rear link 5b are disposed at positions separated in the vehicle longitudinal direction on both sides in the vehicle width direction. 4 and 5, the front link 5a and the rear link 5b are rotatably attached to the upper frame 3 at one end by a front seat support shaft 5c and a rear seat support shaft 5d. The other end is rotatably attached to the lower frame 4 by a front floor support shaft 5e and a rear floor support shaft 5f. The front seat support shaft 5c connects the left and right front links 5a, and the rear seat support shaft 5d connects the left and right rear links 5b. A pair of square bar-like sliders 11 extending in the vehicle longitudinal direction are attached to the lower part of the lower frame 4, and the sliders 11 slide in the vehicle longitudinal direction on slide rails 10 fixed in parallel on the vehicle body floor F, respectively. Engagement is possible. A slide handle 12 is connected to the front side of the pair of sliders 11. When the slide handle 12 is lifted upward, the slider 11 can be slid. When the slide handle 12 is returned to the original position, the slider 11 is fixed at that position. It has come to be. In addition, a protrusion 51 that protrudes rearward and downward is provided on the rear side of the rear link 5b. As shown in FIG. 6, the protrusion 51 is configured to come into contact with a stopper 52 provided on the upper surface of the lower frame 4 when the seat cushion 1 b is deformed. Although the shape of the stopper 52 is not particularly limited, the stopper 52 is made of an elastic member such as rubber, and is moderate so as to prevent the rear link from rebounding when the rear link comes into contact with the rear collision. Those that are deformed into are suitable. If the material is a rigid steel plate, it may be formed into a box shape with a thin plate material and absorbs an impact by plastic deformation at the time of contact.

  As shown in FIG. 3, the upper frame 3 has a substantially rectangular plate-like seat surface member 31 whose center is gently curved downward, and a pair of plates extending in the vehicle front-rear direction on both sides in the vehicle width direction of the seat surface member 31. The seat cushion side frame 32 is provided.

  As shown in FIGS. 5 and 6, the lifter operating portion 6 is rotatably attached to the front side of the center of the seat cushion side frame 32 located on the left side in the vehicle width direction. On the other hand, as shown in FIG. 4, pinion gears (not shown) are rotatably attached to the left and right inner sides of the lifter operation unit 6. The pinion gear has a plurality of teeth on the outer periphery at an equal pitch, and rotates in synchronization with the rotation of the lifter operation unit 6.

  Further, in the vicinity of the pinion gear, a substantially sector plate-shaped sector gear 8 is attached by a sector gear support shaft 8d so as to be rotatable about a base end side (side having an acute angle) as a rotation center. Further, a plurality of tooth portions 8a meshing with the pinion gear are arranged in parallel on the outer circumference of the sector gear 8 forming an arc shape. Further, a rectangular through hole 8b is formed substantially at the center of the sector gear 8, and a substantially L-shaped hook 8c is integrally formed near the upper part of the inner periphery of the through hole 8b. A spiral spring (not shown) is wound around the sector gear support shaft 8d. The spiral spring has one end fixed to the sector gear support shaft 8d and the other end fixed to the hook 8c, and always urges the sector gear 8 to rotate clockwise in a side view from the right side. The sector gear support shaft 8d is connected to one end of a support plate 8e curved in a substantially C shape in a side view, and the other end is connected to a pinion gear support shaft 8f. Thus, the upper frame 3 is configured not to fall deeply by restricting an increase in the distance between the sector gear support shaft 8d and the pinion gear support shaft 8f when the vehicle collides.

  Between the rear link 5b located on the right side in the vehicle width direction and the sector gear 8, a strip-shaped connecting link 9 extending in the horizontal direction is disposed. One end of the connecting link 9 is connected to the upper end of the rear link 5b by the connecting link rear support shaft 9a, and the other end of the connecting link 9 is connected to the vehicle rear side of the sector gear 8 by the connecting link front support shaft 9b. .

  The upper frame 3, the lower frame 4, the front side link 5a, and the rear side link 5b constitute a parallel link. When the occupant P operates the lifter operation unit 6, the sector gear 8 is unidirectionally associated with the rotation of the pinion gear. The front link 5a and the rear link 5b rotate in synchronization with the front of the vehicle in conjunction with the rotation (clockwise rotation in a side view from the right side), and the upper frame 3 moves forward of the vehicle with respect to the lower frame 4. On the other hand, the front link 5a and the rear link 5b rotate in synchronization with the rear of the vehicle in conjunction with the rotation of the sector gear 8 in the other direction (counterclockwise rotation when viewed from the right side). 3 moves downward with respect to the lower frame 4 while moving backward.

  As shown in FIG. 3, a pair of reclining mechanisms 13 for adjusting the angle of the seat back 1a is provided on the side of the seat back 1a where the seat cushion 1b is connected. As shown also in FIG. 1, these pair of reclining mechanisms 13 are connected by a reclining rod 14 that is long in the vehicle width direction. As shown in FIGS. 4 and 5, a pair of hinge brackets 15 are fixed to the rear ends of the pair of seat cushion side frames 32 by pins 16, respectively. Thus, the seat back frame 2 is rotatably supported by the pair of hinge brackets 15 via the pair of reclining mechanisms 13 and the reclining rod 14.

  As shown in FIG. 3, the seat back 1a has a gate-shaped seat back frame 2 and a belt-like lumbar support 21 that is long in the vehicle width direction, and the cushion portion 2a shown in FIG. It is supported. The seat back frame 2 includes a pair of seat back side frames 25 located on both sides in the vehicle width direction, and a connecting pipe 26 that connects upper ends of the pair of seat back side frames 25. Each seat back side frame 25 is formed by press-molding a steel plate, for example, and the distance in the vehicle width direction is set as wide as possible (for example, the inner dimension is 400 mm or more) according to the general body shape of the occupant P. Yes. Between the pair of seat back side frames 25, for example, upper and lower three rows of back springs 28 are connected. The height of the connection pipe 26 is also set as high as possible according to the general body shape of the passenger P (for example, from 625 to 645 mm along the torso line from the hit point). Thus, the back of the occupant P having a general body shape sinks into the seat back frame 2 at the time of a rear collision, and the impact of the occupant P is absorbed by the back spring 28. The hip point is the center of rotation of the torso and thigh of a three-dimensional sitting human body model (3DM-JM50) for measuring vehicle interior dimensions according to JIS (Japanese Industrial Standards) D4607-1977 and corresponds to the hip joint of the human body. It means a point. The torso line represents the direction of a torso bar that is a bar for measuring the inclination angle of a back pad, which is a curved plate shaped like the shape of the back of the trunk of the human body model.

  As shown in FIG. 1, the pair of reclining mechanisms 13 are provided on both sides of the seat cushion 1 b in the vehicle width direction, and the rotation angles of the pair of seat back side frames 25 of the seat back 1 a in the vicinity of the pair of hinge brackets 15. Each can be adjusted to counteract the biasing force. The reclining mechanism 13 includes an internal gear, a pair of lock plates, a cam, a rear bracket (all not shown), a lever 34, a spring fixing portion 35, a spiral spring 36, a coil spring 37, and the like. One reclining mechanism 13 is provided with an operation lever 34 a (shown only in FIG. 2) that is attached to the lever 34 and can be operated, and is operated by operation of the operation lever 34 a that opposes the biasing force of the coil spring 37. The rotation angle of the seat back side frame 25 is configured to be adjustable. The other reclining mechanism 13 is configured to operate by receiving the operating force of the operating lever 34a via the reclining rod 14 and to adjust the rotation angle of the seat back side frame 25.

  A base end portion of a lever 34 is fixed to the reclining rod 14. The spring fixing portion 35 is fixed to the hinge bracket 15, and a spiral spring 36 is externally mounted on the projecting portion 35 a of the spring fixing portion 35 and one end thereof is connected, and the other end of the spiral spring 36 is connected to the rear bracket. The spiral spring 36 urges the seat back 1a to move forward counterclockwise in FIG.

  Both ends of the coil spring 37 are connected to the lever 34 and the spring fixing portion 35. The coil spring 37 urges the reclining rod 14 and the cam together with the lever 34 in the counterclockwise direction in FIG. The biasing force is transmitted from the cam to the pair of lock plates, and the pair of lock plates is biased toward the meshing position.

  As shown in FIG. 1, the reclining rod 14 is long in the vehicle width direction connecting the pair of reclining mechanisms 13, and the operating force of the operating lever 34 a of one reclining mechanism 13 is applied from one of the pair of reclining mechanisms 13. It has a function to transmit to the other. The reclining rod 14 is, for example, a height range from the lower end of the buttock of the general occupant P seated on the seat cushion 1b to the upper end of the sacrum of the pelvis, or upward from a predetermined hip point in the passenger compartment. It arrange | positions so that it may be located in the height range between 100 mm and 150 mm below. For example, the reclining rod 14 is disposed at a height of about 40 mm upward from the hip point. The reclining rod 14 functions to connect the pair of reclining mechanisms 13 to each other and transmit the operating force of the operating lever 34a from one of the pair of reclining mechanisms 13 to the other.

  A through hole 50 for forming a fragile portion is provided at the center of the reclining rod in the vehicle width direction. The reclining rod 14 is made of a metal or a hard synthetic resin into a hollow pipe shape, but may be made of solid. For example, a material having a relatively low tensile strength such as STKM11A is suitable. In the present embodiment, the through hole 50 is circular, and the optimum range of the inner diameter is, for example, about 30% to 50% of the inner diameter of the through hole when the plate thickness is 1.0 mm in the reclining rod 14 having the same outer diameter. In the case of 1.2 mm, it is about 40% to 60%, and in the case of 1.4 mm, it is about 50% to 70%. If the inner diameter of the through hole 50 is too large, the reclining rod 14 may be bent unintentionally due to the impact applied by the occupant even when it is not at the time of the rear impact, and if it is too small, it may not be sufficiently bent at the time of the rear impact. In the case of a solid, it is preferable to increase the inner diameter of the through hole 50 so that it can be bent with an appropriate load. The through-hole 50 is provided by a drilling hole or a crushing process, and a circular shape is suitable, but a shape such as a slit, a square, a triangle, or a star shape may be used. The position of the through hole 50 is preferably provided in a direction in which the occupant P on the seat cushion 1b moves relative to the vehicle at the time of a rear collision of the vehicle, that is, in a direction in which the occupant moves rearward. It is good to penetrate in the horizontal direction with the inclination of 2 fixed. Even if the through hole 50 is provided in the reclining rod 14, the rotational torque applied to one end can be transmitted to the other end, so that the function as the reclining rod 14 is not impaired. Thus, while the reclining rod 14 is comprised with a hollow round pipe and it aims at weight reduction, the function as a weak part and a torque transmission function can be made compatible by making the direction of the through-hole 50 appropriate. Thus, since only the through-hole 50 is provided in the reclining rod 14, the number of parts does not increase and the assembly man-hour does not increase.

  On the other hand, as shown in FIG. 3, the headrest 1 c is attached to the upper end side of the seat back frame 2, and can be adjusted in height by sliding up and down in a configuration without a so-called active headrest mechanism. . Specifically, a gate-shaped headrest stay 41 is vertically inserted into a headrest support portion 40 fixed to the front surface of the connection pipe 26 and can be adjusted to a desired height by a lock portion 42. A gate-shaped headrest lower bracket 43 is fixed to the outer side of the headrest support portion 40 in the vehicle width direction. As shown in FIG. 7, the headrest 1c has a height higher than that of the conventional headrest, and when the height of a general occupant P is adjusted, the top of the headrest and the top of the headrest 1c are almost the same. It is set to line up horizontally. The back set B, which is the distance between the back of the head and the front surface of the headrest 1c when the occupant P is seated, is set to be smaller than the conventional one, for example, about 30 mm. Although not shown, a plate-shaped reinforcing bracket may be provided on the front surface of the headrest support portion 40, or a reinforcing frame made of foamed resin may be provided on the top of the headrest stay 41. In the present embodiment, the active headrest mechanism is not provided in this way, but conversely, the rigidity of the headrest 1c is increased.

−Operation of vehicle seat at rear impact−
Next, the operation | movement at the time of the vehicle rear collision of the vehicle seat 1 concerning this embodiment is demonstrated.

  The most likely case of a rear-end collision of the vehicle is a case where the automobile is rear-end collision from behind, but it also includes a case where the vehicle collides from the rear of the vehicle body when traveling backward.

  At the time of rear-end collision, an inertial force acts on the occupant P seated on the seat cushion 1b as a reaction of the collision of the vehicle. As a result, the back of the occupant P sinks into the seat back 1a. At this time, in the seat back 1a of the present embodiment, since the distance between the left and right seat back side frames 25 is set as wide as possible, the back of the passenger P sinks smoothly into the seat back 1a.

  The load applied to the occupant's P waist is also applied to the reclining rod 14. At this time, since the through hole 50 having an appropriate size with respect to the outer diameter of the reclining rod 14 is provided at the center of the reclining rod 14 in the vehicle width direction, the reclining rod 14 bends appropriately. For this reason, the impact to the waist | hip | lumbar part of the passenger | crew P added by the reclining rod 14 is relieved.

  On the other hand, the head of the occupant P is separated from the headrest 1c by the amount of the backset B when traveling, but tends to tilt toward the headrest 1c due to inertial force at the time of rear collision.

  However, since the back and waist of the occupant P sink smoothly into the seat back 1a and the back set B is kept small, the head comes into contact with the headrest 1c at an early stage. Moreover, the height of the headrest 1c is set to be approximately the same as the head of the occupant P, and the rigidity thereof is ensured to be high, so that the head is reliably received by the headrest 1c.

  The load of the occupant P at the time of the rear impact is also applied to the seat cushion 1b, so that the front / rear intermediate portion of the lower frame 4 bends downward, and the front / rear intermediate portion of the seat cushion side frame 32 extends to the left and right. Even if the seat cushion 1b is deformed downward, since the sector gear support shaft 8d and the pinion gear support shaft 8f are connected by the support plate 8e, the distance between the two is restricted. The upper frame 3 does not fall deeper. In addition, since the protrusion 51 of the rear link 5b reliably abuts against the stopper 52 on the upper surface of the slider 11 to prevent further deformation, the head does not shift downward and is not sufficiently supported by the headrest 1c.

  Accordingly, the through hole 50 is formed in the center of the reclining rod 14 in the vehicle width direction in the direction in which the occupant P on the seat cushion 1b moves relative to the vehicle at the time of rear-end collision, thereby reliably passing through at the time of rear-end collision. Since the impact applied to the occupant P by bending the reclining rod 14 from the hole 50 can be reduced, the manufacturing cost can be kept low with a simple structure while reducing the number of parts, and the occupant P at the time of rear impact can be reduced. I can protect it.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the said embodiment, although the reclining rod 14 was comprised in the shape of a hollow pipe, you may comprise it with a solid. In the case of a solid, the outer diameter of the reclining rod 14 and the size of the through hole 50 may be set so as to be bent with an appropriate load with the same section modulus as in the above embodiment.

  In the above embodiment, the through hole 50 is passed through the hollow portion of the reclining rod 14 in the horizontal direction, but only one wall surface may be passed therethrough. Also in this case, the outer diameter of the reclining rod and the size of the through hole 50 may be set so as to have the same section modulus as that of the above embodiment.

  In the above embodiment, the protrusion 51 of the rear bracket 5b is in contact with the stopper 52. However, even if the protrusion 51 is not provided, a part of the rear bracket 5b is in contact with the stopper 52. Also good. The stopper 52 has a rectangular plate shape provided on the upper surface of the lower frame 4, but the shape thereof is not limited and may be a rectangular parallelepiped shape or a hemispherical shape.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 1a Seat back 1b Seat cushion 1c Headrest 13 Reclining mechanism 14 Reclining rod 15 Hinge bracket 25 Seat back side frame 50 Through hole F Floor P Crew

Claims (2)

A seat cushion placed on the floor of a vehicle, a seat back rotatably supported on the seat cushion via a pair of hinge brackets, a reclining mechanism for adjusting a rotation angle of the seat back, and the seat In a vehicle seat with a headrest connected to the upper part of the back,
The reclining mechanism includes a seat back side frame provided on both sides of the seat back in the vehicle width direction and a reclining rod inserted through the hinge bracket,
A vehicle is characterized in that a through hole is formed at the center of the reclining rod in the vehicle width direction so as to penetrate in a direction in which an occupant on the seat cushion moves relative to the vehicle when the vehicle undergoes a rear collision. Sheet. The vehicle seat according to claim 1,
The reclining rod consists of a hollow round pipe,
The vehicle seat according to claim 1, wherein the through hole is penetrated through the hollow portion in the horizontal direction.

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