JP4067344B2 - Sliding device for vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat slide device in which an anchor for detachably attaching a seat belt is fixed to a seat.
[0002]
[Prior art]
Among vehicle seats, there is known a seat slide device 110 provided below the seat cushion 101 of the rear seat 100 as shown in FIG. 4 so that the front seat as well as the rear seat can be slid forward and backward. It has been.
[0003]
The seat slide device 110 is configured to slide the rear seat 100 in the front-rear direction when the slide lever 102 provided on the front side of the seat cushion 101 is operated. As shown in FIG. And the lower rail 112 supported by the two fulcrums 114 and 115 spaced apart from each other by a predetermined distance in the front-rear direction. The upper rail 111 is connected to the lower rail 112. On the other hand, it is slidable within a certain length range in the front-rear direction. Here, the upper rail 111 slides over the rearmost end position indicated by the solid line in FIG. 5 and the foremost end position indicated by the two-dot chain line in FIG. 5.
[0004]
In recent years, seat belts have been required to be installed in order to improve safety. Regarding the rear seat, as shown in FIG. 6, anchors 120 and 121 for detachably attaching a three-point supported seat belt for the left and right seats are provided on the rear frame 102a for the three-seat cushion frame 102, A fixing member 122 for fixing a two-point supported seat belt for the center seat and an anchor 123 for detachably attaching the seat belt are provided.
[0005]
Furthermore, in order to improve safety, attention is also paid to the impact resistance of the slidable rear seat. With respect to such impact resistance, an evaluation test for evaluating the sheet strength is performed, and an evaluation test for the sheet anchorage strength is known as one of the evaluation tests. As one of the evaluation tests for the seat anchorage strength, for example, there is a method of attaching each seat belt to an anchor and pulling each seat belt forward while the seat is slid to the foremost position.
[0006]
Specifically, as shown in FIG. 7, the evaluation test is performed by attaching the middle part of a seat belt 131 for right seats whose both ends are mounted on the vehicle body side to the anchor 120 and both ends being mounted on the vehicle body side. The middle part of the seat belt 132 is attached to the anchor 121, and the other end of the two-point supported seat belt 133 having one end attached to the fixing member 122 is attached to the anchor 123. In the belts 131 and 132, two places are pulled forward with a predetermined tensile load, and in the two-point supported seat belt 133, one place is similarly pulled. Note that reference numeral 135 in FIG. 7 denotes an attachment portion of the seat belt to the vehicle body.
[0007]
As a result of such a test, it is required that the seat slide device is as abnormal as possible.
[0008]
[Problems to be solved by the invention]
By the way, in the seat slide device, as a result of the evaluation test of the seat anchorage strength, it is required that the upper rail is separated from the engaging portion with the lower rail, that is, so-called peeling does not occur. The peeling occurs as follows. That is, as shown in FIG. 7, the rear frame 102a to which the plurality of anchors 120 and the like are attached is bent forward by the tensile load, and the rear end of the upper rail 111 is displaced inwardly. At this time, as shown in FIG. 5, the seat is slid to the foremost position, and the load is applied to the lower rail 112 portion corresponding to the rear end of the upper rail 111, that is, the center portion sandwiched between the two fulcrums 114 and 115 of the lower rail 112. And the upper portion of the lower rail 112, that is, the engaging portion of the lower rail 112 with the upper rail 111 is displaced and bent inward by the force received from the rear end of the upper rail 111, and the lower rail 112 is bent. The lower part of the central part of the box is bent (buckled) in the shape of the letter “ku” on the opposite outer side (indicated by white arrows). This is caused by the opening of the rear end of the upper rail 111 being expanded by deformation of the upper portion of the central portion of the lower rail 112.
[0009]
Thus, as a countermeasure for preventing such peeling, it is conceivable to form a bead portion curved in a convex shape or a concave shape from the front end to the rear end of the lower rail 112. However, a more reliable peeling prevention measure is desired. .
[0010]
The present invention has been made in order to meet the above-described demands, and is a vehicle seat slide device that can effectively prevent peeling by moving deformation caused by a load acting on the central portion of the lower rail to the front side of the lower rail. The purpose is to provide.
[0011]
[Means for Solving the Problems]
The vehicle seat slide device according to the present invention includes a pair of lower rails supported on the vehicle body floor at two front and rear fulcrums, and a pair of uppers that are slidably engaged with engagement portions provided on the upper portions of the lower rails. In a vehicle seat slide device having a rail and a cushion frame mounted on the pair of upper rails, and an anchor to which a seat belt is detachably attached to a rear frame of the cushion frame is fixed, It said lower rail is one having a depending portion below the engagement portion of the upper rail, hanging parts on the front side than the center portion between the two front and rear support point, the amount of deformation stepwise enough to the front increases so as have a site of changing the cross-sectional shape, varying the lower rail acts load equal to or greater than a predetermined in the rear frame through the seat belt When the maximum deformed portion of the lower rail is being located in front of the central portion between the two front and rear fulcrum.
[0012]
In the vehicle seat sliding device of the present invention, the cross-sectional shape between the two front and rear fulcrums at the hanging portion below the engaging portion that engages with the upper rail of the lower rail changes stepwise, and the seat belt When the load is applied to the rear frame through the rear frame and the lower rail is deformed, the maximum deformation portion of the lower rail is located on the front side of the central portion between the two front and rear fulcrums. When the load acts on the rear frame via the seat belt, the maximum deformation occurs at the front side position relative to the central portion of the two front and rear fulcrums of the lower rail. This reduces the amount of deformation at the top and bottom of the center part of the two front and rear fulcrums of the lower rail and suppresses the spread of the rear end opening of the upper rail, so of course when setting the seat at the front end position. Even if the sheet is set at any other position, the occurrence of peeling can be effectively prevented. Further, in the vehicle seat slide device of the present invention, the engaging portion that engages with the upper rail is left as it is, and the shape of only the lower portion may be changed, and the design change of the peripheral members including the upper rail is omitted. It becomes possible to do.
[0013]
In the vehicular seat slide device according to the present invention, the drooping portion changes the cross-sectional shape stepwise at a first position in front of the central portion and a second position further in front of the first position. Yes, the cross-sectional shape of the drooping portion in front of the second position is I-shaped, the cross-sectional shape of the drooping portion from the first position to the second position is L-shaped, and the drooping portion of the rear side from the first position is The cross-sectional shape may be formed so that the upper side is formed in an I shape and the lower side is formed in a horizontal U shape.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described.
[0015]
1 is a front view showing a vehicle seat slide device according to the present embodiment, FIG. 2 is a left side view of the upper part thereof, FIG. 3A is an end view taken along line AA in FIG. 1, and FIG. ) Is an end view taken along line BB in FIG. 1, and FIG. 3C is an end view taken along line CC in FIG.
[0016]
As shown in FIG. 1, the seat slide device 1 is slidable on a vehicle interior floor 10 on a pair of lower rails 2 supported by a front fulcrum 11 and a rear fulcrum 12 separated in the front-rear direction, and on each lower rail 2. A pair of upper rails 3 is provided, and a cushion frame 102 is attached on both upper rails 3. FIG. 1 shows a state where the upper rail 3 is slid to the foremost end position.
[0017]
The cushion frame 102 shown in FIG. 6 is used. That is, anchors 120 and 121 for detachably attaching the seat belts for the left and right seats are provided on the upper side of the rear frame 102a, the fixing member 122 for fixing the seat belt for the center seat, and the seat belt can be attached and detached. And an anchor 123 to be attached to.
[0018]
As shown in FIG. 2, each upper rail 3 has a substantially U-shaped cross section having an opening 31 on the lower side, and is engaged at both ends facing the opening 31. The part 32 is formed by bending. On the other hand, each lower rail 2 is obtained by attaching two processed plate materials 20A and 20B back to back by welding or the like, and has an engaging portion 22 formed with downward projecting portions 21a at both ends of the horizontal plate portion 21 at the upper portion. The hanging part 23 is provided below the central part in the width direction of the engaging part 22, and the cross section is formed in a substantially T shape. Note that the lower end side of the drooping portion 23 is omitted in FIG. 2 and will be described in detail later.
[0019]
The upper rail 3 is locked to the upper portion of the lower rail 2 by inserting the engaging portion 22 so as to engage with the engaged portion 32. A plurality of, for example, cylindrical rollers 4 are arranged between the upper inner surface of the upper rail 3 and the horizontal plate portion 21, and the upper rail 3 can slide with respect to the upper portion of the lower rail 2.
[0020]
As shown in FIGS. 1 and 3, the hanging portion 23 in the lower rail 2 on the front side (the left side of the vehicle body) shown in FIG. When a load greater than a predetermined value acts on the rear frame 102a and the lower rail 2 is deformed, the maximum deformation portion of the lower rail 2 is stepwise so as to be located in front of the central portion between the two front and rear fulcrums 11 and 12, In this embodiment, it is changed in three stages. Specifically, the cross-sectional shape of the drooping portion 23 is changed at two locations, a first position E in front of the central portion D and a second position F in front of the first position E. On the rear side from the first position E, as shown in FIG. 3C (C-C line in FIG. 1), the upper side is formed in an I shape and the lower side is formed in a U shape in the horizontal direction. 3 and the second position F, as shown in FIG. 3B (B-B line in FIG. 1), it is formed in an L shape, and in front of the second position F, FIG. It is formed in an I-shape as shown in FIG. That is, the lower end portion of the lower rail 2 is formed in three forms: no flange, with a flange, and with a stronger flange. In this embodiment, the change in the cross-sectional shape of the hanging portion 23 is performed only on the processing plate material 20A on the left side of the two processed plate materials 20A and 20B, and the hanging portion 23 of the processed plate material 20B is the lower rail. 2 is formed straight over the entire length.
[0021]
The above is the configuration of the hanging portion of the lower rail 2 on the front side shown in FIG. 1, but the lower rail (the right side of the vehicle body) is formed symmetrically with the lower rail 2 on the front side.
[0022]
Therefore, when the seat anchorage strength evaluation test described in the section of the related art is performed for the seat slide device 1 of the present embodiment configured as described above, the rear frame 102a is provided via the anchor 120 or the like. Even if a predetermined load or more that causes bending (buckling) deformation of the lower rail 2 from the upper rail 3 is applied to the rear frame 102a due to a forward pulling force acting on the rear frame 102a, the center portion D of the front and rear two fulcrums 11 and 12 of the lower rail 2 Also deforms maximally at the front position. Specifically, the amount of deformation at the first position E where the cross-sectional shape of the drooping portion 23 is maximum deformed at the second position F formed in an I-shape, and the cross-sectional shape of the drooping portion 23 is formed in an L-shape. Is smaller than the amount of deformation at the second position F, and the amount of deformation at the center D formed by the cross-sectional shape of the hanging portion 23 having an I-shape on the upper side and a U-shape on the lower side is the first position E. It becomes smaller than the amount of deformation. This reduces the amount of deformation at the upper and lower portions of the central portion D of the front and rear two fulcrums 11 and 12 of the lower rail 2 and suppresses the spread of the rear end opening of the upper rail 3, so that the seat is set at the frontmost end position. In this case, of course, even if the sheet is set at any other position, the occurrence of peeling can be effectively prevented.
[0023]
Further, in this embodiment, since only the cross-sectional shape of the hanging portion 23 of the lower rail 2 is changed, the engaging portion 22 can be left as it is, and a peripheral member (such as a cushion frame) including the upper rail can be designed. There is an advantage that it is not necessary to make a change and can be omitted.
[0024]
Further, in the above-described embodiment, the cross-sectional shape of the lower side of the engaging portion is changed at the first position E and the second position F on the front side of the center portion D of the two front and rear fulcrums of the lower rail 2. The present invention is not limited to this, and the lower cross-sectional shape of the engaging portion may be changed at one or more arbitrary locations on the front side of the center portion D. In addition, the cross-sectional shape is not limited to the above-described lateral U-shape, L-shape, and I-shape, and other shapes can be used.
[0025]
Moreover, in embodiment mentioned above, although cross-sectional shape is changed only with respect to one 20A of the two processed board materials 20A and 20B which comprise a lower rail, this invention is not limited to this, The other processed board material 20B. Alternatively, the cross-sectional shapes of the processed plate materials 20A and 20B may be changed.
[0026]
In the above-described embodiment, the lower rail 2 is configured by the two processed plate materials 20A and 20B, but the present invention is not limited to this. For example, one processed plate material may be used, or three or more processed plate materials may be used in combination.
[0027]
In the embodiment described above, the seat belt of the center seat of the three-seat rear seat is applied to the two-point support, but the present invention is not limited to this. For example, as shown by a broken line in FIG. 7, the invention can be similarly applied to a three-point support in which the end portion of the seat belt 133 of the central seat is attached to the vehicle body ceiling portion or the seat back upper portion 136. Furthermore, the present invention can be similarly applied to a slidable front seat in which an anchor is attached to a cushion frame.
[0028]
【The invention's effect】
As described above in detail, in the case of the present invention, the cross-sectional shape between the two front and rear fulcrums at the hanging portion below the engaging portion that engages with the upper rail of the lower rail changes stepwise, and the seat belt When the load is applied to the rear frame through the rear frame and the lower rail is deformed, the maximum deformation portion of the lower rail is located on the front side of the central portion between the two front and rear fulcrums. When the load acts on the rear frame via the seat belt, the maximum deformation occurs at the front side position relative to the central portion of the two front and rear fulcrums of the lower rail. This reduces the amount of deformation at the top and bottom of the center part of the two front and rear fulcrums of the lower rail and suppresses the spread of the rear end opening of the upper rail, so of course when setting the seat at the front end position. Even if the sheet is set at any other position, the occurrence of peeling can be effectively prevented. Further, in the present invention, the engaging portion that engages with the upper rail is left as it is, and the shape of only the lower portion may be changed, and the design change of the peripheral member including the upper rail can be omitted.
[Brief description of the drawings]
FIG. 1 is a front view showing a vehicle seat slide device according to an embodiment of the present invention.
FIG. 2 is a left side view of the upper part of the seat slide device of FIG.
3A is an end view taken along line AA in FIG. 1, FIG. 3B is an end view taken along line BB in FIG. 1, and FIG. 3C is an end view taken along line CC in FIG. .
FIG. 4 is an external perspective view showing a rear seat to which a vehicle seat slide device is applied.
FIG. 5 is a front view showing a conventional vehicle seat slide device.
FIG. 6 is an external perspective view showing a cushion frame.
FIG. 7 is a diagram used for explaining the contents of a sheet anchorage strength evaluation test.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seat slide apparatus 2 Lower rail 3 Upper rail 11 Front fulcrum 12 Rear fulcrum 22 Engagement part 23 Hanging part D Center part E 1st position F 2nd position 102 Cushion frame 102a Rear part frame 120, 121, 123 Anchor

Claims (2)

A pair of lower rails supported on the vehicle body floor at two front and rear fulcrums, a pair of upper rails that are slidably engaged with engaging portions provided on the upper portions of the lower rails, and the upper rails A vehicle seat slide device in which an anchor to which a seat belt is detachably attached is fixed to a rear frame of the cushion frame.
It said lower rail is one having a depending portion below the engagement portion of the upper rail, hanging parts on the front side than the center portion between the two front and rear support point, the amount of deformation stepwise enough to the front increases When the lower rail is deformed by a load exceeding a predetermined value acting on the rear frame via the seat belt, the maximum deformation portion of the lower rail is the center between the two front and rear fulcrums. A vehicle seat slide device, wherein the vehicle seat slide device is located on the front side of the portion. The drooping portion has a stepwise change in cross-sectional shape between a first position in front of the central portion and a second position in front of the first position, and the drooping portion in front of the second position. The cross-sectional shape of the hanging part from the first position to the second position is L-shaped, the cross-sectional shape of the rear hanging part from the first position is I-shaped, the lower side The vehicle seat sliding device according to claim 1 , wherein the vehicle seat is formed in a U-shape.

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