JP2005247065A - Vehicle headrest device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headrest device for a vehicle capable of increasing a headrest forward moving force and a reverse prevention force by using not only a rearward moving force acting on an occupant's back part at the time of a rear collision but also a rearward moving force acting on a waist. Offer.
SOLUTION: A lower cross member 4c extending in the vehicle width direction and coupled to a seat back frame 4 is provided at a position substantially corresponding to an occupant waist portion Mw below the seat back 2, and acts on the waist portion Mw at the time of a rear collision. The lower cross member 4c is bent and deformed by the rearward movement force Fw, and the front end portion 8a of the lower transmission member 8 connected to the lower cross member 4c and protruding upward acts on the back portion Mb of the occupant M. By inputting the moving force Fb and engaging the load input unit 6 that is displaced backward, both the rear moving forces Fb and Fw acting on the back part Mb and the waist Mw of the occupant M can be input to the load input unit 6. The forward pushing force of the headrest 3 can be increased.
[Selection] Figure 1

Description

  The present invention relates to a vehicle headrest device used in a vehicle such as an automobile, and more particularly to an active type vehicle headrest device that moves a headrest forward in the event of a rear-end collision of a vehicle.

  As a conventional automobile headrest device, the headrest is moved forward of the vehicle at the time of a rear-end collision of the vehicle, and the occupant's head is largely prevented from moving backward, thereby protecting the occupant's cervical spine. is there.

  For example, the rearward movement force of the occupant at the time of a rear collision is received by a pressure receiving member provided at a substantially central portion inside the seat back, that is, a portion corresponding to the back portion of the occupant, and the headrest connected to the pressure receiving member is Is known to be moved forward of the vehicle around the center of the vehicle (see Patent Document 1).

In this case, the urging force of the spring is applied to the movable portion from the pressure receiving member to the headrest in the non-operating direction so that the headrest moves only when a certain load or more, that is, a rear collision load is applied to the pressure receiving member.
JP 2002-274240 A (3rd page, FIG. 1)

  However, the conventional vehicle headrest device reverses the load direction input to the pressure receiving member by the seesaw principle and transmits it to the headrest, but the force for moving the headrest forward and the force for preventing the headrest from moving backward are Only the rearward movement force received by the pressure receiving member from the back portion of the occupant.

  For this reason, when the load on the head of the occupant is acting on the headrest, there is a risk that the front pushing force of the headrest cannot be sufficiently obtained, and if the degree of rear collision is large, the headrest inevitably The acting backward movement force also increases, but there is a possibility that a sufficient stopping force cannot be generated to prevent the headrest from moving backward after the head of the passenger interferes with the headrest.

  Therefore, the present invention can increase the forward movement force and the backward movement prevention force of the headrest by using not only the backward movement force acting on the back part of the occupant but also the backward movement force acting on the waist part at the time of a rear collision. A headrest device for a vehicle is provided.

  The vehicle headrest device according to the present invention supports a headrest provided on an upper portion of a seatback and holding an occupant's head so as to be pivotable back and forth on a seatback frame via a headrest support member, and a substantially central portion of the seatback. Inside, a load input part is provided that inputs a backward movement force acting on the back part of the occupant in the event of a rear collision and is displaced rearward. The rearward displacement of the load input part is transmitted to the headrest support member via the upper transmission member. In the vehicle headrest device for moving the headrest forward, the vehicle extends in the vehicle width direction at a position substantially corresponding to the occupant's waist at the lower part of the seat back and acts on the waist during a rear collision by coupling to the seat back frame. A lower cross member that bends and deforms due to a backward moving force is provided, and is connected to the lower cross member and protrudes upward. The main feature is that a lower transmission member is provided, and the tip of the lower transmission member is engaged with the load input portion so that the amount of bending deformation of the lower cross member is transmitted to the load input portion. .

  According to the present invention, at the time of a rear collision, the backward moving force acting on the occupant's back portion is input to the load input portion, and the backward moving force acting on the occupant's waist portion is applied to the load via the lower cross member and the lower transmission member. Since it is input to the input unit, it is possible to push the headrest forward by inputting both the rearward movement forces acting on the back and waist of the occupant to the load input unit, thus increasing the forward pushing force of the headrest. be able to.

  Therefore, in the event of a rear collision, it is possible to obtain a sufficient forward pushing force of the headrest, and to prevent the headrest from moving backward when the occupant head interferes with the headrest, thereby improving the restraint of the occupant head There is an advantage that you can.

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

  1 to 5 show a first embodiment of a vehicle headrest device according to the present invention, FIG. 1 is a side view of the headrest device, FIG. 2 is a perspective view of a skeleton structure of a seat back, and FIG. 4 is an enlarged sectional view taken along line BB in FIG. 2, and FIG. 5 is a perspective view of the skeleton structure of the seat back when the headrest device is operated.

  As shown in FIG. 1, the vehicle headrest device 1 according to the first embodiment is configured such that a headrest 3 provided on an upper portion of a seatback 2 and holding a head H of an occupant M can be pivoted back and forth on a seatback frame 4. A headrest support member 5 that is supported on the seatback, and a load input that is disposed inside the substantially central portion of the seatback 2 and that inputs a backward movement force Fb that acts on the back (thoracic vertebra) portion Mb of the occupant M at the time of a rear collision, And an upper transmission member 7 that transmits the rear displacement of the load input unit 6 to the headrest support member 5 and rotates the headrest support member 5 in a direction in which the headrest 3 moves forward of the vehicle. Yes.

  Then, when the occupant M moves backward from the dotted line position in FIG. 1 to the solid line position due to inertial force at the time of the rear collision of the vehicle, the headrest 3 moves forward (arrow a) as indicated by the solid line, and moves backward. The occupant's head H (arrow b) is restrained more forward, and the head H is prevented from moving backward greatly to protect the cervical spine.

  As shown in FIG. 2, the seat back frame 4 includes a pair of side frames 4a extending up and down on both left and right sides of the seat back 2, and an upper frame 4b connecting the upper ends of the side frames 4a. The headrest support member 5 is attached to the upper frame 4b.

  A pair of headrest support members 5 are provided at two symmetrical positions sandwiching the central portion of the upper frame 4b in the vehicle width direction, and are rotatably mounted on the upper frame 4b. As shown in FIG. A pair of left and right stays 3a hanging from the headrest 3 are inserted in the upper part of the support member 5 so that the vertical position can be adjusted, and the headrest 3 can be moved forward by the rotation of the headrest support member 5 about the upper frame 4b. Is done.

  The upper transmission member 7 is formed of a rod-shaped body that connects the load input portion 6 and the headrest support member 5, and the upper end portion 7 a is fitted to the lower portion of the headrest support member 5, and the intermediate portion is placed forward of the vehicle. The lower end portion 7b is arranged in the vicinity of the back portion Mb of the occupant M, and the load input portion 6 is coupled to the lower end portion 7b.

  As shown in FIG. 3, the load input portion 6 is provided with a pressure receiving surface 6a on the front surface, a connecting portion 6b of the upper transmission member 7 is provided on the back surface of the pressure receiving surface 6a, and a concave notch is formed below the connecting portion 6b. A portion 6c is formed.

  Here, in the present embodiment, as shown in FIG. 2, the vehicle extends in the vehicle width direction at a position substantially corresponding to the occupant waist Mw (see FIG. 1) at the lower part of the seat back 2, and both ends thereof are attached to the seat back frame 4. A lower cross member 4c that is coupled to the side frame 4a and is bent and deformed by a rearward movement force Fw (see FIG. 1) that acts on the occupant waist Mw at the time of a rear collision is provided, and is connected to the lower cross member 4c and protrudes upward. A lower transmission member 8 is provided that engages the tip end portion 8 a with the load input portion 6 and transmits the amount of bending deformation of the lower cross member 4 c to the load input portion 6.

  The lower transmission member 8 is formed of a plate-like member that is curved so that the cross-sectional shape in the vehicle width direction is convex toward the front of the vehicle as shown in FIG. 4, and is shown in FIG. 3 when the headrest device 1 is assembled. In this manner, the tip 8a of the lower transmission member 8 is engaged with the notch 6c of the load input portion 6 in a state where the tip 8a is bent rearward from the natural state shown by the two-dot chain line in FIG.

  The lower transmission member 8 is integrally formed by projecting a blank material upwardly from the center in the vehicle width direction of the lower cross member 4c into a strip shape, cutting it into a substantially T shape, and pressing it so as to curve the cross section. Is formed.

  Further, since the lower transmission member 8 has a cross-sectional shape projecting forward of the vehicle, the lower transmission member 8 has higher rigidity toward the front of the vehicle than rigidity toward the rear of the vehicle, and is difficult to bend forward of the vehicle. It is easy to bend.

  The lower transmission member 8 can be prepared separately from the lower cross member 4c and welded together, and the sectional shape of the lower transmission member 8 in the vehicle width direction is curved. Without limitation, any shape that can effectively increase the rigidity toward the front of the vehicle may be used. For example, a trapezoidal cross-sectional shape that is convex toward the front of the vehicle as shown in FIG.

  According to the vehicle headrest device 1 of the present embodiment having the above-described configuration, as shown by the solid line position from the dotted line position in FIG. A backward moving force Fb acting on the back portion Mb of M is input to the load input unit 6.

  Further, the rearward movement force Fw acting on the waist Mw of the occupant M deflects the lower cross member 4c rearward of the vehicle, and the amount of deflection is transmitted to the load input unit 6 via the lower transmission member 8 as a rearward pressing force. .

  For this reason, both the backward moving force Fb acting on the back portion Mb of the occupant M and the backward moving force Fw acting on the waist Mw of the occupant M are input to the load input unit 6 to push the headrest 3 forward. Therefore, the forward pushing force of the headrest 3 can be increased.

  Accordingly, the front pushing force of the headrest 3 can be sufficiently obtained at the time of a rear collision, and the headrest 3 is prevented from moving backward when the occupant head H interferes with the headrest 3, so that the occupant head H It is possible to enhance the restraining property of the occupant and, in turn, the protective effect of the occupant's cervical spine at the time of a rear collision.

  Further, when the degree of collision is large and the lower cross member 4c reaches the plastic deformation region, the state where the load input portion 6 is pressed rearward by the lower transmission member 8 can be maintained, so that the headrest 3 is pushed forward. Can be held in position.

  Of course, the lower cross member 4c and the lower transmission member 8 are formed with rigidity that does not easily deform with respect to the input from the occupant waist Mw during normal operation.

  Further, in the present embodiment, in addition to the above-described effects, the lower transmission member 8 is formed of a plate-like member having a cross-sectional shape in the vehicle width direction that is convex forward of the vehicle. Since the rigidity can be increased, the rearward movement force Fw input to the lower cross member 4c can be efficiently transmitted to the load input unit 6.

  Further, since the distal end portion 8a of the lower transmission member 8 is bent to the rear of the vehicle and connected to the load input portion 6, the elastic force caused by the bending at this time is always applied to the load input portion 6 by pushing the vehicle forward. Therefore, the lower transmission member 8 can also be used as an urging means for preventing the headrest 3 from moving forward during normal operation, and the number of parts can be reduced and the cost can be reduced.

  7 and 8 show a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. FIG. 8 is a cross-sectional view taken along the line CC in FIG. 7.

  As shown in FIGS. 7 and 8, the vehicle headrest device 1 according to the second embodiment has a portion facing the occupant waist Mw (see FIG. 1) at a portion where the lower transmission member 8 of the lower cross member 4c is continuously provided. That is, in this embodiment, the protrusion part 9 which protrudes ahead of a vehicle is provided in the vehicle width direction center part.

  The protrusion 9 is integrally bulged and formed on the upper half of the lower cross member 4c by a press molding with a predetermined width W in the vehicle width direction and a protrusion amount S, and the lower transmission member 8 protrudes from the upper end of the protrusion 9. ing.

  Therefore, according to the second embodiment, by projecting the protrusion 9 from the lower cross member 4c, when the occupant M moves rearward at the time of a rear collision, the rearward movement force Fw of the occupant waist Mw is Since the timing of acting on the lower cross member 4c via the protrusion 9 can be advanced, the timing of moving the headrest 3 forward can also be advanced and the responsiveness at the time of a rear collision can be improved.

  Further, since the lower cross member 4c can be greatly deformed by the amount of protrusion of the protrusion 9 with respect to the amount of rearward movement of the occupant waist Mw, a larger rearward movement force Fw is applied to the load input portion 6 to The amount of forward movement 3 and the holding force of the head H can be further increased.

  Furthermore, in the present embodiment, the amount of forward movement and the holding force of the headrest 3 can be controlled by adjusting the shape and the arrangement site of the protrusions 9.

  FIG. 9 shows a third embodiment of the present invention, in which the same components as those of the above-described embodiments are denoted by the same reference numerals and redundant description is omitted. FIG. 9 is a lower cross including a lower transmission member. It is a perspective view of a member.

  As shown in FIG. 9, the vehicle headrest device 1 of the third embodiment is a portion where the lower transmission member 8 of the lower cross member 4c is connected, that is, in the present embodiment, at the center in the vehicle width direction of the lower cross member 4c. On both sides, a pair of bead portions 10 are formed as rigidity reduction portions that induce movement of the lower transmission member 8 around the lower cross member 4c.

  In other words, in the present embodiment, the lower transmission member 8 protrudes from the upper end portion of the lower cross member 4c with a base portion 8b having an appropriate length L, and has the length L in the vicinity of both sides of the portion where the base portion 8b is formed. The bead portion 10 is recessed with a substantially equivalent length L ′.

  Therefore, according to the third embodiment, when the rearward movement force Fw of the occupant waist Mw (see FIG. 1) is input to the lower cross member 4c at the time of a rear collision, the lower cross member 4c starts from the bead portion 10. The torsional deformation is easily performed, and the rotational behavior around the lower cross member 4c of the lower transmission member 8 is induced and promoted. Therefore, the rotation angle of the distal end portion 8a of the lower transmission member 8 is increased to increase the load input portion 6. The amount of rearward movement of the headrest 3 can be increased, and consequently the amount of forward movement of the headrest 3 can be increased.

  Of course, the bead portion 10 is adjusted so that the torsional deformation of the lower cross member 4c does not occur with respect to the load from the occupant waist portion Mw that acts during normal operation.

  In this embodiment, the bead portion 10 is formed as the rigidity reduction portion. However, the material of the lower cross member 4c of the portion where the rigidity is to be reduced is not limited to the bead portion 10, and the rigidity reduction is performed. You may form a notch etc. in a part.

  10 and 11 show a fourth embodiment of the present invention, in which the same reference numerals are given to the same components as those of the above-described embodiments, and a duplicate description is omitted, and FIG. 10 includes a lower transmission member. 11 is a perspective view of the lower cross member, and FIG. 11 is a cross-sectional view taken along the line DD in FIG.

  In the vehicle headrest device 1 according to the fourth embodiment, as shown in FIGS. 10 and 11, the lower transmission member 8 ′ is formed of a material having higher strength than the lower cross member 4c.

  That is, the high strength material includes, for example, a light alloy material, a resin material, a composite resin material, etc., and the lower transmission member 8 'formed of the high strength material is separated from the base portion 8b formed on the lower cross member 4c. As shown in FIG. 11, the lower transmission member 8 'formed separately is covered with the lower end portion on the outer side of the upper end portion of the base portion 8b and integrated by joining the overlapping portions.

  In this case, when the lower transmission member 8 'is joined to the base 8b, when the lower transmission member 8' is formed of a light alloy material, it is integrated by spot welding K as shown in FIG. When 'is formed of a resin material or a composite resin material, they are integrated using an adhesive.

  Therefore, according to the fourth embodiment, the lower transmission member 8 'is formed separately from the lower cross member 4c, and the lower transmission member 8' is formed of a high-strength material, thereby achieving weight reduction. In addition, the load transmission characteristic of the lower transmission member 8 ′ that transmits the rearward movement force Fw of the occupant waist Mw (see FIG. 1) input to the lower cross member 4 c to the load input unit 6 can be improved.

  By the way, although the vehicle headrest device of the present invention has been described by taking the first to fourth embodiments as examples, the present invention is not limited to these embodiments, and various other embodiments are adopted without departing from the gist of the present invention. be able to.

It is a side view of the headrest device in a 1st embodiment of the present invention. It is a perspective view of the frame structure of the seat back in a 1st embodiment of the present invention. It is an enlarged side view of the A section in FIG. FIG. 3 is an enlarged cross-sectional view along the line BB in FIG. 2. It is a perspective view of the frame structure of a seat back at the time of operation of the headrest device in a 1st embodiment of the present invention. It is sectional drawing corresponding to FIG. 4 which shows the modification of the lower transmission member in 1st Embodiment of this invention. It is a perspective view of the lower cross member containing the lower transmission member in 2nd Embodiment of this invention. FIG. 8 is a cross-sectional view taken along line CC in FIG. 7. It is a perspective view of the lower cross member containing the lower transmission member in 3rd Embodiment of this invention. It is a perspective view of the lower cross member containing the lower transmission member in 4th Embodiment of this invention. FIG. 11 is a sectional view taken along line DD in FIG. 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle headrest apparatus 2 Seat back 3 Headrest 4 Seat back frame 4c Lower cross member 5 Headrest support member 6 Load input part 7 Upper transmission member 8, 8 'Lower transmission member 9 Protrusion part 10 Bead part (rigidity reduction part)
M Crew H Crew head Mb Crew back Mw Crew waist

Claims (5)

A headrest supporting member that supports a headrest that is provided on the upper portion of the seatback and holds the passenger's head, and that is pivotably supported by the seatback frame;
A load input portion that is disposed inside a substantially central portion of the seat back and inputs a backward movement force acting on the back portion of the occupant at the time of a rear collision, and is displaced backward;
In a vehicle headrest device comprising: an upper transmission member that transmits a rearward displacement of the load input portion to the headrest support member, and rotates the headrest support member in a direction in which the headrest moves forward of the vehicle.
A lower cross member that extends in the vehicle width direction at a position substantially corresponding to the occupant's waist at the lower part of the seat back, is coupled to the seat back frame, and is bent and deformed by a backward movement force acting on the occupant's waist at the time of a rear collision;
A lower transmission member that is connected to the lower cross member and protrudes upward, engages the tip of the lower cross member with the load input portion, and transmits the amount of deformation of the lower cross member to the load input portion; A vehicle headrest device.   The lower transmission member is formed of a plate-like member whose cross-sectional shape in the vehicle width direction is convex toward the front of the vehicle, and connected to the load input portion in a state where the upper end of the lower transmission member is bent toward the rear of the vehicle. The vehicle headrest device according to claim 1.   3. The vehicle headrest device according to claim 1, wherein a protrusion that protrudes forward of the vehicle is provided at a portion facing the occupant's waist at a lower transmission member continuous portion of the lower cross member.   The rigidity lowering part which induces the movement of the lower transmission member centering on the lower cross member is formed on both sides of the lower transmission member connecting portion of the lower cross member. Headrest device for vehicles as described in one.   The vehicle headrest device according to any one of claims 1 to 4, wherein the lower transmission member is formed of a material having a strength higher than that of the lower cross member.

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