JPH092336A - Car body structure - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the collision energy absorption performance by eliminating the thrust of the spare tire at the time of a vehicle rear surface collision and smoothly deforming the rear floor. A downward rotation moment is generated around the spare tire clamp portion 9 on the rear side portion of the rear floor 1 via the towing hook 14 at the time of a rear collision of the vehicle.
The rear side portion of the rear floor 1 is deformed forward with a downward deformation, and the front side portion is lifted while the spare tire 12 is clamped and fixed, so that the rear floor 1 can be smoothly deformed and deformed. I am doing it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile body structure, and more particularly to a structure around a spare tire house on a rear floor.

[0002]

2. Description of the Related Art Conventionally, in order to improve the cushioning performance at the time of a rear collision of an automobile, as shown in, for example, Japanese Patent Laid-Open No. 62-39376, the rear wall of a spare tire house recessed in the rear floor is rear-mounted. On the other hand, the bracket is fixed to the center of the spare tire house and is fixed to the center of the spare tire, that is, the bracket that fixes the center of the wheel disc. It is known that a clamp bolt is inserted and a wheel disc is tightened and fixed by a nut for clamping.

This is because the spare tire hits the front side of the spare tire house at the time of a rear-end collision of the vehicle, and the rear side of the spare tire rides on the slope and leans forward with the contact point as a fulcrum. Then, the bracket is deformed obliquely upward, the clamp bolt is disengaged from the notch, and the restraint of the spare tire is released, so that the spare tire does not exist as a projecting member and the collapse deformation of the rear floor is allowed. To do.

In addition, in addition to the above, the actual construction of Shokai 56-175276
As disclosed in the publication, in order to prevent splash intrusion from the drainage port provided at the rear portion of the spare tire house, the drainage port is covered under the rear portion of the spare tire house to join the bracket portion of the tow hook. The one arranged is known.

[0005]

In the former structure, in order to allow the spare tire house to ride on the slope of the rear side of the spare tire house in the case of a rear collision of the vehicle, the spare tire is spared as described above. The front side of the tire house must be struck and that part must be the fulcrum.

Therefore, it cannot be denied that the spare tire still exists as the upholstery material.

In the latter structure, the drainage port is covered with the bracket portion of the tow hook to prevent the splash from entering through the drainage port, so that there is no function of removing the spare tire at the time of rear collision of the vehicle. However, the spare tire exists as a bulging material, and crush deformation of the rear floor is hindered.

Therefore, according to the present invention, the cushioning function can be improved by smoothly crushing and deforming the rear floor without the presence of the spare tire clamped to the spare tire house as a projecting member at the time of rear collision of the vehicle. A vehicle body structure for an automobile is provided.

[0009]

According to a first aspect of the present invention, the front inclination angle of the front wall of the spare tire house recessed in the rear floor is set larger than the rear inclination angle of the rear wall of the spare tire house. It is characterized in that the front end portion of the tow hook joined and arranged on the lower surface of the rear end portion of the rear floor is extended to the lower surface portion of the spare tire clamp portion of the spare tire house for fixing the center portion of the spare tire.

According to a second aspect of the present invention, in the spare tire house according to the first aspect, a fragile portion is provided between the front wall of the spare tire house and the joining portion of the front end portions of the towing hooks. In this case, the fragile portion according to claim 2 is formed as a bead portion projecting to the lower surface side of the spare tire house in a circular shape centered on the spare tire clamp portion, and a drain hole is formed in the bead portion. It is characterized by having done.

According to a fourth aspect of the present invention, the rear wall of the spare tire house according to the first to third aspects is constituted by a jack mount bracket for storing and fixing the jack.

According to a fifth aspect of the present invention, the joint width in the vehicle width direction of the rear end portion of the tow hook joined to the lower surface of the rear end portion of the rear floor according to the fourth aspect is set between the jack mount bracket and the rear end panel. It is characterized in that it is set to a width substantially equal to the length in the vehicle width direction of the jack folded and stored in.

[0013]

According to the first aspect of the present invention, the front end of the tow hook joined and arranged on the lower surface of the rear end of the rear floor is extended to the lower surface of the spare tire clamp of the spare tire house for fixing the center of the spare tire. Therefore, at the time of a rear-end collision of the vehicle, a downward rotation moment is generated around the spare tire clamp part on the rear side of the rear floor via the towing hook, and the rear side of the rear floor is deformed forward with a downward deformation. Then, the front side of the spare tire is lifted while being clamped.

At this time, since the rear wall of the spare tire house is tilted rearward, the rear wall of the spare tire house is slidably contacted with the rear side portion of the spare tire and the rear side rear portion is smoothly deformed to the lower side. On the other hand, since the front inclination angle of the front wall of the spare tire house is set to be larger than the rear inclination angle of the rear wall of the spare tire house, the front side of the spare tire houses along the slope of the front wall of the spare tire house that is largely inclined forward. Sliding, the lifting operation of the front side of the spare tire is smoothly performed.

As a result, the front side of the spare tire does not hit the front wall of the spare tire house and the spare tire does not serve as a bulging member, and the rear floor is smoothly deformed and deformed, and the crush deformation stroke is expanded to cause a collision. The energy absorption performance can be improved.

Since the front side of the spare tire does not hit the front wall of the spare tire house in this manner and the spare tire does not move forward in a pressure-bonded state with the front wall of the spare tire house, the front side of the spare tire house on the lower surface of the rear floor is near the front side. It is possible to avoid interference with the suspension member and the fuel tank.

According to the second aspect, when a downward rotation moment is generated at the rear side portion of the rear floor about the spare tire clamp portion at the time of a rear collision of the vehicle, this rotation moment causes the rear floor to move downward from the weak portion as a starting point. The deformation of the spare tire is promoted, the forward deformation accompanied by the downward deformation is smoothly performed, and the lifting operation of the front side portion of the spare tire is further smoothly performed.

According to the third aspect of the present invention, the downwardly projecting bead portion as the fragile portion is formed in a circular shape around the spare tire clamp portion, and the beat portion is provided with the drain hole. In the event of a collision, the front side of the spare tire can be lifted up smoothly, and during electrodeposition coating of the vehicle body, the electrodeposition coating solution in the spare tire house can be captured in a wide range by the bead portion and discharged from the drain hole. The coating liquid can be smoothly drained, uneven coating can be avoided, and the coating work time can be shortened.

According to claim 4, since the jack mount bracket is effectively used as the rear wall of the spare tire house, the number of parts can be reduced and the cost can be reduced.

According to the fifth aspect, the joint width of the rear end of the tow hook in the vehicle width direction is set to be substantially equal to the vehicle width direction length of the jack folded and stored between the jack mount bracket and the rear end panel. Therefore, the panel rigidity of the jack fixing portion is enhanced, and the jack storage stability can be enhanced.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes a rear floor, and a spare tire house 2 for storing a spare tire 12 in a horizontal orientation is recessed on the rear side thereof.

A spare tire house 2 on the lower surface of the rear floor 1
A cross member 3 having an inverted hat cross section of a strength member in the vehicle width direction is joined to a position near the front side of the cross member 3.
A lateral link 5 of a rear suspension member is pivotally supported by a bracket 4 joined to the front and rear walls of the.

A fuel tank 6 is mounted near the front side of the portion where the lateral link 5 is arranged.

In the present embodiment, the spare tire house 2 has its front wall 2a formed in an arc shape with a radius sufficiently larger than that of the spare tire 12 with a spare tire clamp portion, which will be described later, as the center. Both side walls 2b following the wall 2a are formed substantially straight up to the rear edge of the rear floor 1.

At the rear end of the rear floor 1, a rear edge flange 1a is joined to a rear end panel 7, and a brace 8 having an inverted L-shaped cross section is provided across the rear end panel 7 and the rear portion of the bottom wall 2d of the spare tire house 2. And the front wall thereof is used as the rear wall 2c of the spare tire house 2.

The center of the spare tire house 2 is slightly bulged upward in the shape of an arc, and a nut plate 9 having a hat-shaped cross section with which a clamp bolt 10 is screwed is joined to the top of the spare tire house. As a department.

The spare tire 12 is a wheel disc 13
Is housed horizontally in the spare tire house 2 with the upper side facing upward, the clamp bolt 10 is inserted into the center hole 13a of the wheel disc 13 via the clamp plate 11, and the clamp bolt 10 is screwed into the nut plate 9 The spare tire 12 is firmly clamped in the spare tire house 2.

The front wall 2a of the spare tire house 2 is inclined and formed at an appropriate angle in a forward inclined state, while the rear wall 2c of the spare tire house 2 is also inclined and inclined at an appropriate angle in a backward inclined state, The front inclination angle θ ₁ of the front wall 2a is set sufficiently larger than the rear inclination angle θ ₂ of the rear wall 2c so as to have a gentle slope shape.

As will be described later, the rearward inclination angle θ ₂ of the rear wall 2c is not pressure-bonded to the rear side portion of the spare tire 12 when the rear portion of the vehicle body is deformed and moved forward due to the rear surface collision of the vehicle. The angle is such that it can slide relative to the rear side.

Reference numeral 14 is a towing hook which is arranged to be joined to the lower surface of the rear end of the rear floor 1, and is a hook bracket 15 formed in a substantially rectangular tray shape, and a U-shape which is joined to the rear end of the hook bracket 15 and projects rearward. And a hook body 16 of the.

The hook bracket 15 overlaps the flange 15a at the upper peripheral edge with the lower surface of the bottom wall 2d of the spare tire house 2 and joins them together, and the flange 15 provided upright on the rear end edge.
b is sandwiched between the rear edge flange 1a of the rear floor 1 and the rear end panel 7 and integrally joined, and the front end of the hook bracket 15 serves as the spare tire clamp portion on the bottom wall 2d of the spare tire house 2. It extends to the lower surface of the joint portion of the nut plate 9 joined to.

At the front and rear of the hook bracket 15,
A water drain hole 15c is formed so that when water enters from the joint portion or the like, it can be discharged to the outside.

On the bottom wall 2d of the spare tire house 2, there is formed a bead portion 17 projecting to the lower surface side as a weak portion between the front wall 2a and the joint portion of the front end portion of the hook bracket 15.

In this embodiment, the bead portion 17 is formed in a circular shape centered on the nut plate 9, and a plurality of drain holes 18 are formed in the bead portion 9.

According to the structure of the above embodiment, when the vehicle collides with the following vehicle or the obstacle M as shown in FIG. 2, the rear part of the vehicle body deforms and moves forward.
Since the hook bracket 15 of No. 4 extends to the lower surface of the nut plate 9 of the spare tire house 2 and is joined and arranged, the hook plate 15 of the nut plate 9 is provided on the rear side of the rear floor 1 via the towing hook 14. As shown by an arrow in FIG. 2, a downward rotation moment is generated around the disposition portion, that is, the clamp portion of the spare tire 12.

Therefore, the rear side portion of the rear floor 1 is deformed forward along with the downward deformation, and the front side portion is lifted while the spare tire 12 is clamped and fixed.

At this time, the rear wall 2c of the spare tire house 2
Is inclined rearward at an angle θ ₂ , the rear wall 2c of the spare tire house 2 slides on the rear side of the spare tire 12,
The rear wall 2c can be smoothly deformed to the lower side of the rear side portion of the rear floor 1 without being pressed against the rear side portion of the spare tire 12.

On the other hand, since the front wall 2a of the spare tire house 2 is inclined forward at the front inclination angle θ ₁ which is larger than the rear inclination angle θ ₂ of the rear wall 2c, the front side portion of the spare tire 12 is greatly inclined forward. By sliding along the slope of the front wall 2a of the spare tire house 2, the lifting operation of the front side portion of the spare tire 12 is smoothly performed.

As a result, the front side portion of the spare tire 12 does not hit the front wall 2a of the spare tire house 2 and the spare tire 12 does not serve as a tension member, and the rear floor 1 is smoothly deformed and crushed. The deformation stroke is enlarged, and the collision energy absorption performance can be enhanced.

Further, since the front side of the spare tire 12 does not hit the front wall 2a of the spare tire house 2 in this manner and the spare tire 12 does not move forward in a pressure-bonded state with the front wall 2a, the rear floor 1 of the rear floor 1 does not move. Interference with the lateral link 5 and the fuel tank 6 near the front side of the spare tire house 2 on the lower surface can be reliably avoided, and the safety can be further improved.

Particularly in the present embodiment, the bottom wall 2d of the spare tire house 2 is joined to the front wall 2a and the joint portion of the front end portion of the hook bracket 15 extending to the lower surface of the joint portion of the nut plate 9. Since the bead portion 17 as a fragile portion is provided in the meantime, the rear floor 1 is promoted to be deformed downward from the bead portion 17 as a starting point by the above-described rotational moment, and the downward deformation is prevented. Accordingly, the deformation to the front is smoothly performed, and the lifting operation of the front side portion of the spare tire 12 is further smoothly performed.

In addition to such an effect on the cushioning performance, the bead portion 17 described above is formed in a circular shape around the joint arrangement portion of the nut plate 9, and the drain hole 18 is provided in the bead portion 17. Therefore, the electrodeposition coating liquid in the spare tire house 2 can be captured in a wide range by the bead portion 17 and discharged from the drain hole 18 during the electrodeposition coating of the vehicle body, and the drainage of the electrodeposition coating liquid can be smoothly performed. It is possible to avoid uneven coating and shorten the coating work time.

FIGS. 5 and 6 show a second embodiment of the present invention. In this embodiment, the rear end panel 7 and an appropriate gap are provided on the rear end of the bottom wall 2d of the spare tire house 2. A jack mount bracket 19 for storing and fixing the jack 20 is arranged by joining, and the rear wall 2c of the spare tire house 2 is constituted by the jack mount bracket 19.

The jack mount bracket 19 is arranged in a rearwardly inclined state at an appropriate angle θ ₂ as a countermeasure against the rear surface collision of the vehicle so that the same effect as that of the above embodiment can be obtained.

The jack 20 is folded and pressed between the jack mount bracket 19 and the rear end panel 7 so as to be stored and fixed in a horizontal position, and the jack 20 is fixed to the jack mount bracket 19 and the rear end panel 7.
And a rigid body structure between them and exert a reinforcing function equivalent to the case where the brace 8 is provided.

When the jack mount bracket 19 is effectively used as the rear wall 2c of the spare tire house 2 as described above, the joining width W of the rear end portion of the tow hook 14 in the vehicle width direction of the rear end portion of the hook bracket 15 is set. , These jack mount bracket 19 and rear end panel 7
By setting the width substantially equal to the vehicle width direction length L of the jack 20 that is folded and stored between and, the panel rigidity of the fixed portion of the jack 20 can be increased and the storage stability of the jack 20 can be increased. .

[0048]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, at the time of collision of the rear surface of the vehicle, a downward rotation moment about the spare tire clamp portion is generated on the rear floor by the towing hook joined and arranged on the lower surface of the rear end portion of the rear floor. The front part of the spare tire can be lifted while the spare tire is clamped and the front part of the spare tire can be lifted against the front wall of the spare tire house by deforming the side part to the front side with the downward deformation. It is possible to prevent the spare tire from becoming a bulging material and to smoothly perform the crushing deformation of the rear floor to expand the crushing deformation stroke, so that the collision energy absorbing performance can be improved.

In addition, since the front side of the spare tire does not hit the front wall of the spare tire house in this manner and the spare tire does not move forward in a pressure-bonded state with the front wall, the front side of the spare tire house on the lower surface of the rear floor is in the vicinity of the front side. It is possible to avoid interference with the suspension member and the fuel tank, and further improve safety.

According to the second aspect, when a downward rotation moment is generated in the rear side portion of the rear floor about the spare tire clamp portion at the time of rear collision of the vehicle, this rotation moment causes the rear floor to move downward from the weak portion as a starting point. The deformation of the spare tire is promoted, the forward deformation accompanied by this downward deformation is performed smoothly, the lifting operation of the front side of the spare tire is performed more smoothly, and the collapse deformation of the rear floor is further smoothed. Can be done.

According to the third aspect, the downwardly projecting bead portion as the fragile portion is formed in a circular shape centering on the spare tire clamp portion, and the drain hole is provided in the bead portion. In the event of a collision, the front side of the spare tire can be lifted up smoothly, and during electrodeposition coating of the vehicle body, the electrodeposition coating solution in the spare tire house can be captured in a wide range by the bead portion and discharged from the drain hole. The coating liquid can be smoothly drained, uneven coating can be avoided, and the coating work time can be shortened.

According to the fourth aspect, since the jack mount bracket is effectively used as the rear wall of the spare tire house, the number of parts can be reduced and the cost can be reduced.

According to the fifth aspect, the joint width of the rear end portion of the towing hook in the vehicle width direction is set to be substantially equal to the vehicle width direction length of the jack folded and stored between the jack mount bracket and the rear end panel. Therefore, the panel rigidity of the jack fixing portion is enhanced, and the storage stability of the jack can be enhanced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a deformed state at the time of a rear surface collision of the first embodiment of the present invention.

FIG. 3 is a plan view of the first embodiment of the present invention.

FIG. 4 is a perspective view of a tow hook.

FIG. 5 is a sectional view showing a second embodiment of the present invention.

FIG. 6 is a plan view of a second embodiment of the present invention.

[Explanation of symbols]

 1 Rear Floor 2 Spare Tire House 2a Front Wall 2c Rear Wall 9 Spare Tire Clamp Part 12 Spare Tire 14 Tow Hook 17 Bead Part (Weak Part) 18 Drain Hole 19 Jack Mount Bracket 20 Jack

Claims (5)

[Claims] 1. A towing hook having a front wall of a spare tire house recessed in the rear floor set to have a front tilt angle larger than a rear tilt angle of a rear wall of the spare tire house and joined to a lower surface of a rear end of the rear floor. The vehicle body structure of claim 1, wherein a front end portion of the vehicle is extended to a lower surface portion of a spare tire clamp portion of a spare tire house for fixing a center portion of the spare tire. 2. A vehicle body structure for an automobile according to claim 1, wherein the spare tire house is provided with a fragile portion between a front wall thereof and a joining portion of the front end portions of the towing hooks. 3. The fragile portion is formed as a bead portion projecting to the lower surface side of the spare tire house in a circular shape centered on the spare tire clamp portion, and a drain hole is formed in the bead portion. The vehicle body structure according to claim 2. 4. The vehicle body structure according to claim 1, wherein a rear wall of the spare tire house is formed by a jack mount bracket for storing and fixing the jack. 5. The width in the vehicle width direction of the rear end portion of the tow hook joined to the lower surface of the rear end portion of the rear floor is defined as the vehicle width direction length of the jack folded and stored between the jack mount bracket and the rear end panel. The vehicle body structure according to claim 4, wherein the widths are set to be substantially equal.