JP2021094894A - Spring base mounting structure - Google Patents

Abstract

To suppress deformation to a spring base for highly efficient absorption of an upward push-up force by a suspension spring even when the push-up force is large.SOLUTION: A spring base 17 with a horizontal spring supporting surface 17f includes a projecting part 17a projecting to the exterior side in the vehicle width direction from a rear frame 13 disposed at both side parts of a vehicle body; a turning-back part 17b which turns back upward from a protruding outer end of the projecting part 17a to cross the vehicle width direction; and a connecting part 17c joining the turning-back part 17b to a side wall 13d of the rear frame 13 on the exterior side.SELECTED DRAWING: Figure 4

Description

The present invention relates to a spring base mounting structure to which a suspension spring is mounted.

As a spring base mounting structure, for example, there is one described in Patent Document 1. In this spring base mounting structure, the disk-shaped spring base protrudes about half from the bottom of the rear frame to the outside of the car, and this protruding part is horizontally fixed to the side wall of the rear frame on the outside of the car with an L-shaped auxiliary gusset. Has been done. A spring is attached under the horizontal spring base, and the vertical force when the spring expands and contracts can be absorbed through the spring base.

WO2016 / 163223

However, in the spring base mounting structure of Patent Document 1, when the upward pushing force by the spring is too large, this excessive force is transmitted orthogonally to the horizontal plane of the spring base, so that the spring base is deformed and the pushing force is raised. The problem arises that it cannot be absorbed efficiently.

The present invention has been made in view of such circumstances, and an object of the present invention is to suppress deformation of the spring base and efficiently absorb the pushing force even when the upward pushing force of the suspension spring is large. And.

In order to achieve the above object, in the spring base mounting structure of the present invention, the spring base having a horizontal spring support surface projects from the rear frames arranged on both sides of the vehicle body to the outside of the vehicle in the vehicle width direction. A connection that connects the protruding portion, a turning portion that bends upward from the protruding outer end of the protruding portion and intersects the vehicle width direction, and the turning portion to the side wall on the outer side of the vehicle of the rear frame. It is characterized by having a part.

According to the present invention, even when the upward thrust force of the suspension spring is large, the deformation of the spring base can be suppressed and the thrust force can be efficiently absorbed.

It is a top view which shows the structure which looked at the rear half of the car body from the bottom. It is a perspective view of the structure of the rear frame to which the spring base is fixed as seen from the diagonally lower left side of the outside of the car. FIG. 2 is an enlarged view of a spring base surrounded by a frame in FIG. FIG. 2 is a sectional view taken along line IV-IV of FIG. It is a figure which shows the structure of the triangular connecting part in the side view of the vehicle body. FIG. 2 is a sectional view taken along line VI-VI of FIG. It is a figure which shows the structure of the spring base by the bottom view. FIG. 3 is a sectional view taken along line VIII-VIII of FIG.

<Structure of Embodiment>
Embodiments of the present invention will be described in detail with reference to FIGS. 1 to 8. In the description, the same elements are designated by the same reference numerals, and duplicate description will be omitted. Further, in each figure, "front and back" indicated by arrows indicate the front-rear direction of an automobile (vehicle body), "left and right" indicates the width direction of the vehicle body, and "up and down" indicates the vertical vertical direction.

FIG. 1 is a plan view showing a structure in which substantially the rear half of the vehicle body is viewed from below. In addition, the tire is described by the alternate long and short dash line.
As shown in FIG. 1, the vehicle body 10 includes a pair of side sills 12 extending in the front-rear direction on both sides in the vehicle width direction. Inside the rear portion of the pair of side sills 12, the front portions of the pair of rear frames 13 are connected to each other. The pair of rear frames 13 extend in the front-rear direction. Front and rear floor panels 11 are installed between the pair of side sills 12 and the pair of rear frames 13.

On the lower surfaces of the pair of rear frames 13, rear cross members 14 extending in the vehicle width direction are fixed to the bridge in a state orthogonal to the rear frames 13. On the rear side of the rear cross member 14, an end cross member 15 is fixed to the bridge in parallel with the rear cross member 14. A rear floor panel 16 joined to the front floor panel 11 is provided on the upper side of the end cross member 15.

Further, a spring base 17, which is a characteristic element of the present embodiment, is fixed to the lower surface of the rear frame 13.

A disk-shaped subframe mounting portion 18 is fixed to the rear side of the spring base 17. The subframe mounting portion 18 is a member for mounting a subframe (not shown), which is a partial skeleton of the vehicle body, with bolts or the like. The subframe fixes the suspension, the engine, and / or the motor to the lower part of the vehicle body.

FIG. 2 is a perspective view of the structure of the rear frame 13 to which the spring base 17 is fixed as viewed from diagonally lower left on the outside of the vehicle. Since the spring base 17 is symmetrical, the spring base 17 on the left side will be described, and the description on the right side will be omitted.

As shown in FIG. 2, the rear frame 13 has a rear frame front portion 13i and a rear frame rear portion 13b. The front portion 13i of the rear frame has a rectangular cross section as a hollow cross section and extends to the front and rear of the vehicle body. It slopes downward and extends. The rear frame rear portion 13b extends continuously rearward from the rear frame front portion 13i, and the upper surface extends horizontally from the rear end of the rear frame front portion 13i to form a shape extending to the rear end 13a. The subframe mounting portion 18 is arranged so as to straddle the boundary 22 between the rear frame front portion 13i and the rear frame rear portion 13b.

The spring base 17 is in front of the subframe mounting portion 18 and is fixed to the rear side wall (rear frame side wall) 13d and the bottom wall (rear frame bottom wall) 13e of the rear frame front portion 13i. The spring base 17 surrounded by the square frame 20 is shown enlarged in FIG. Further, an IV-IV cross-sectional view of the spring base 17 shown in FIG. 2 is shown in FIG.

As shown in FIG. 4, the spring base 17 has a protruding portion 17a protruding from the rear frame 13 to the outside of the vehicle by a predetermined length in the vehicle width direction. The protruding portion 17a has a turning portion 17b that is bent upward at an outer end protruding to the outside of the vehicle.

As shown in FIG. 3, the turning portion 17b has a surface that projects from the rear frame side wall 13d to the outside of the vehicle in a curved manner and intersects the vehicle width direction. A connecting portion 17c is covered from the outside of the vehicle and welded to the turning portion 17b as shown by a cross.

A circular spring support surface 17f (see FIG. 7) is horizontally fixed to the bottom surface of the protruding portion 17a, and a convex spring upper end support portion 17y projects downward from the spring support surface 17f. .. Here, it is assumed that an upward pushing force is transmitted to the spring base 17 as a vertical force from a spring (not shown) fitted in the support portion 17y. This transmitted push-up force is transmitted as a shearing force to the turning portion 17b that is welded (marked with x) by overlapping the connecting portion 17c extending vertically. In this way, the pushing force of the spring is transmitted to the spring base 17 in the vertical direction.

As shown in FIG. 3, the connecting portion 17c is welded by closely covering the outer peripheral surface of the turning portion 17b with the lower end portion 17d having substantially the same shape as the outer peripheral surface of the turning portion 17b (see FIG. 4). ing. That is, the connecting portion 17c covers the turning portion 17b of the protruding portion 17a in a shielded state from the outside. Further, the upper end portion 17e having the flange of the connecting portion 17c is welded to the rear frame side wall 13d.

A closed cross section is formed by the protruding portion 17a and the connecting portion 17c, and the side walls 13d and 13g and the bottom wall 13e on both sides of the rear frame 13.

As shown in FIG. 5, the connecting portion 17c has a triangular shape in a side view of the vehicle body at a portion protruding to the outside of the vehicle. The triangular shape of the connecting portion 17c includes a bead portion 17h extending downward from the top, a front inclined side portion 17e1 as a flange inclined forward and downward from the top of the bead portion 17h, and a front inclined side portion 17e1 thereof. It has a rear-inclined side portion 17e2 as a flange that inclines rearward and downward from the top. However, the triangular shape is preferably an equilateral triangle.

The front inclined side portion 17e1 and the rear inclined side portion 17e2 are connected to the rear frame side wall 13d on the outer side of the vehicle. Further, as shown in FIG. 4, the surface of the connecting portion 17c between the front inclined side portion 17e1 and the rear inclined side portion 17e2 is curved (see FIG. 7) apart from the rear frame side wall 13d. ..

The bead portion 17h is formed in a convex shape downward from the triangular top of the connecting portion 17c, and extends perpendicularly to the base 17e3 to the vicinity of the triangular base 17e3.

As shown in FIG. 6, the spring base 17 is joined to a circular support bottom surface 17i (see FIG. 7) when viewed from the bottom surface, and a side wall 13 g inside the vehicle inside the rear frame 13 that wraps around from the support bottom surface 17i to the inside of the vehicle. It has an extension flange of 17 g. Further, the extension flange 17g is a portion that wraps around the inside of the vehicle and rises upward from the support bottom surface 17i via a gap (see FIG. 4) on the lower side of the rear frame bottom wall 13e.

A circumferential spring support surface 17f (see FIG. 7) in which a downwardly protruding spring upper end support portion 17y is integrally formed is fixed to the support bottom surface 17i.

As shown in FIG. 7, the spring base 17 includes a projecting surface 17i1 projecting horizontally from the circular support bottom surface 17i, and has a drain hole 17j penetrating the projecting surface 17i1.

The protruding surface 17i1 has a bowl shape with a curved cross section, and an electrodeposition liquid is applied to the inner surface of the bowl-shaped protruding surface 17i1 to prevent rust. For example, by immersing the vehicle body 10 in a rust preventive liquid (electrodeposition liquid), the rust preventive liquid is allowed to enter through the welding gap of the spring base 17. After that, when the vehicle body 10 is pulled up from the rust preventive liquid, the coating liquid is discharged from the drain hole 17j. As a result, the rust preventive liquid is surely applied to the inner surface of the support bottom surface 17i of the spring base 17.

As shown in FIG. 8, the protruding portion 17a and the connecting portion 17c of the spring base 17 are separate members. The lower end portion 17d of the connecting portion 17c covers the turning portion 17b of the protruding portion 17a from the outside of the vehicle and is welded as shown by a cross. Further, the connecting portion 17c is welded by closely covering the outer peripheral surface of the turning portion 17b with a lower end portion 17d having substantially the same shape as the outer peripheral surface of the turning portion 17b.

As shown in FIG. 8, the circular spring support surface 17f horizontally fixed to the support bottom surface 17i of the protrusion 17a becomes a spring upper end support portion 17y whose central portion protrudes downward in a convex shape. ing.

That is, the pushing force from the spring fitted to the spring upper end support portion 17y is diffused by the upper end support portion 17y to the circular spring support surface 17f, and further diffused to the support bottom surface 17i of the protrusion portion 17a. Be transmitted. This diffused and transmitted thrusting force is transmitted from the turning portion 17b of the protruding portion 17a to the side walls 13d and 13g (see FIG. 4) inside and outside the vehicle body of the rear frame 13 via the connecting portion 17c. That is, the pushing force from the spring is diffused to the entire spring base 17 and transmitted to the rear frame 13.

As shown in FIG. 3, the turning portion 17b that protrudes from the rear frame side wall 13d to the outside of the vehicle in a curved shape has a plurality of fixed seat surfaces that are convexly raised at predetermined intervals in the bending direction with the connecting portion 17c. It is provided with a raised portion 17k. Each raised portion 17k is covered with a connecting portion 17c and welded as shown by a cross.

As shown in FIG. 4, the protruding portion 17a has a turning portion 17b that is bent upward at the outer end protruding to the outside of the vehicle, and the lower end portion 17d of the connecting portion 17c is welded to the turning portion 17b. Has been done. Further, the upper end portion 17e having the flange of the connecting portion 17c is welded to the rear frame side wall 13d. Therefore, as shown in FIG. 8, the connecting portion 17c has an inclined surface 17c1 that is inclined downward from above toward the outside of the vehicle between the upper end portion 17e and the lower end portion 17d. In other words, the connecting portion 17c has an inclined surface 17c1 that inclines upward from the lower end portion 17d to the inside of the vehicle.

In the connecting portion 17c, the pushing force from the spring via the spring upper end supporting portion 17y is inclined toward the rear frame side wall 13d inside the vehicle from under the connecting portion 17c via the protruding portion 17a. Join in.

<Effect of embodiment>
Next, the characteristic configuration of the spring base mounting structure of the present embodiment described above and its effect will be described.

(1) The spring base 17 having a horizontal spring support surface 17f has a protrusion 17a protruding outward from the rear frame 13 arranged on both sides of the vehicle body 10 in the vehicle width direction, and a protrusion 17a. It is configured to include a turning portion 17b that bends upward from the protruding outer end of 17a and intersects the vehicle width direction, and a connecting portion 17c that connects the turning portion 17b to the side wall 13d on the outside of the vehicle of the rear frame 13. ..

According to this configuration, in the spring base 17, the protruding portion 17a protruding from the rear frame 13 on the outside of the vehicle in the vehicle width direction is bent upward at the outer end protruding on the outside of the vehicle and intersects with the vehicle width direction. It has a recess 17b. By bending in the orthogonal state in this way, the rigidity of the spring base 17 is increased.

Further, by providing the connecting portion 17c that connects the turning portion 17b to the side wall 13d of the rear frame 13, an upward pushing force (pushing input) is thrust via the turning portion 17b and the connecting portion 17c. It can be received by the side wall 13d extending in the same direction as the raising force. Therefore, even if the pushing force is too large, the pushing force is transmitted in the same direction as the vertical extension direction of the turning portion 17b and the connecting portion 17c, so that the deformation of the spring base 17 can be suppressed. That is, the indicated strength of the spring base 17 can be increased. Conventionally, the pushing force is transmitted to the horizontal plane in the direction orthogonal to the pushing force, the horizontal plane is dented and deformed, and the indicated strength of the spring base 17 is weakened. As described above, in the present embodiment, even when the push-up force due to the spring of the suspension is large, the deformation of the spring base 17 can be suppressed and the push-up force can be efficiently absorbed.

(2) In the above (1), a closed cross section is formed by the rear frame, the protruding portion, the turning portion, and the connecting portion.

According to this configuration, the connecting portion 17c covers the protruding portion 17a so as to block it from the outside. This is a configuration in which a closed cross section is formed by the connecting portion 17c and the protruding portion 17a of the spring base 17, and the side wall 13d and the bottom wall 13e of the rear frame 13. That is, the spring base 17 is provided with rust countermeasures to prevent mud from entering the closed cross section from the outside. Further, since the closed cross section is formed, the rigidity of the spring base 17 can be increased.

(3) In the above (1), the connecting portion 17c has a triangular shape when viewed from the side of the vehicle body 10.

According to this configuration, the upward pushing force acting on the triangular base 17e3 of the connecting portion 17c can be distributed substantially evenly between the front inclined side portion 17e1 and the rear inclined side portion 17e2. If the triangular shape is an equilateral triangle, the pushing force can be evenly distributed. By this dispersion, it is possible to prevent the pushing force from being locally concentrated on the connecting portion 17c and being deformed.

(4) In the above (3), the connecting portion 17c has a bead portion 17h shaped in the vertical direction when viewed from the side surface of the vehicle body 10.

According to this configuration, the pushing force acting on the bottom surface 17e3 of the connecting portion 17c can be transmitted to the rear frame side wall 13d by the bead portion 17h in the vertical direction. Therefore, the pushing force transmitted to the spring base 17 can be absorbed.

(5) In the above (1), the protruding portion 17a has a circular support bottom surface 17i when viewed from the bottom surface, and the side wall of the rear frame 13 inside the vehicle body by wrapping around from the support bottom surface 17i to the inside of the vehicle. It was configured to have an extension flange 17 g coupled to 13 g.

According to this configuration, the pushing force transmitted from the spring through the spring upper end support portion 17y is evenly distributed by the circular support bottom surface 17i, and further, the inner side wall 13g of the rear frame 13 is distributed via the extension flange 17g. Is transmitted to the outer rear frame side wall 13d via the connecting portion 17c. Therefore, since the pushing force is dispersed, the deformation of the protruding portion 17a can be suppressed.

(6) In the above (5), the spring base 17 is provided with a protruding surface 17i1 projecting horizontally from the supporting bottom surface 17i, and is provided with a drain hole 17j penetrating the protruding surface 17i1.

According to this configuration, after the rust preventive liquid flows into the inner surface of the support bottom surface 17i of the spring base 17 and is fully held, the rust preventive liquid accumulated from the drain hole 17j can be easily discharged. Therefore, the rust preventive liquid can be reliably applied to the inner surface of the support bottom surface 17i.

(7) In the above (1), the protruding portion 17a and the connecting portion 17c are separate members, and the connecting portion 17c is joined by covering the turning portion 17b of the protruding portion 17a from the outside of the vehicle. The configuration was set to.

According to this configuration, since the connecting portion 17c is covered and coupled to the turning portion 17b of the protruding portion 17a, both the protruding portion 17a and the connecting portion 17c have a common shape. Therefore, both of them can be easily manufactured by press molding. Further, since the connecting portion 17c is connected to the turning portion 17b by covering it from the outside, it becomes difficult for a liquid such as muddy water to enter the inner surface of the protruding portion 17a and the connecting portion 17c from the outside.

(8) In the above (5), a circular spring support surface 17f fixed to the support bottom surface 17i of the protrusion 17a is provided. The spring support surface 17f is configured to include a spring upper end support portion 17y whose central portion protrudes downward in a convex shape.

According to this configuration, the pushing force from the spring fitted to the spring upper end support portion 17y is diffused to the spring support surface 17f in a circular shape by the upper end support portion 17y, and further, the support bottom surface 17i of the protruding portion 17a. It is diffused and transmitted to. Therefore, the pushing force from the spring can be transmitted so that the protruding portion 17a is not deformed.

(9) In the above (7), the turning portion 17b is provided with raised portions 17k in which the fixed seat surface with the connecting portion 17c is raised in a convex shape at predetermined intervals in the bending direction, and the connecting portion 17c is provided on each raised portion 17k. Was combined.

According to this configuration, the following effects can be obtained. For example, when both the turning portion 17b and the connecting portion 17c are overlapped and welded on the curved surfaces, a gap is formed between the curved surfaces, and a portion that cannot be properly welded is formed. However, in the present invention, since the connecting portion 17c is welded to the plurality of raised portions 17k formed in the bending direction of the turning portion 17b, it is possible to properly weld all the raised portions 17k. Therefore, the pushing force from the spring can be reliably received by the rear frame side wall 13d via the turning portion 17b and the connecting portion 17c of the protruding portion 17a.

(10) In the above (3), the connecting portion 17c has an inclined surface 17c1 that inclines downward toward the outside of the vehicle.

According to this configuration, the following effects can be obtained. For example, it is assumed that the inclined surface 17c1 is inclined from the lower side to the upper side of the vehicle in the opposite direction to the above, and is further bent inward of the vehicle to be connected to the rear frame side wall 13d. Further, it is assumed that the inclined surface 17c1 rises perpendicularly to the horizontal line and further bends inward in the vehicle direction in the horizontal direction to be connected to the rear frame side wall 13d. In these configurations, the inclined surface 17c1 bends upward at the bending corner at the upper end due to the pushing force, so that the pushing force cannot be efficiently transmitted to the rear frame side wall 13d.

However, in the present embodiment, the connecting portion 17c has an inclined surface 17c1 that inclines upward from the lower end portion 17d to the inside of the vehicle. Since the inclined surface 17c1 is inclined from the lower end portion 17d toward the rear frame side wall 13d, the connecting portion 17c is not deformed by the pushing force. Therefore, the pushing force can be efficiently transmitted to the rear frame side wall 13d.

Although the vehicle body structure according to the present embodiment has been described above, the present invention is not limited to this, and can be appropriately changed without departing from the gist of the present invention. For example, the cross section of the rear frame 13 may be a polygon such as a pentagon other than a rectangle as long as it has an upper surface, a lower surface, and left and right side walls.

10 Body 13 Rear frame 13a Rear end 13b Rear frame rear 13i Rear frame front 13d, 13g Rear frame side wall 13e Rear frame bottom wall 17 Spring base 17a Overhang 17b Turning part 17c Connecting part 17c1 Inclined surface 17d Lower end 17e Upper end 17e1 Front inclined side 17e2 Rear inclined side 17e3 Bottom 17f Spring support surface 17g Extension flange 17h Bead part 17i Support bottom surface 17i1 Protruding surface 17j Drain hole 17k Raised part 17y Spring upper end support part

Claims (10)

A spring base with a horizontal spring support surface
The protruding parts protruding from the rear frame arranged on both sides of the car body to the outside of the car in the width direction of the car,
A turning portion that bends upward from the protruding outer end of the protruding portion and intersects the vehicle width direction, and a turning portion.
A spring base mounting structure including a connecting portion for connecting the turning portion to a side wall on the outer side of the vehicle of the rear frame. The spring base mounting structure according to claim 1, wherein a closed cross section is formed by the rear frame, the protruding portion, the turning portion, and the connecting portion. The spring base mounting structure according to claim 1, wherein the connecting portion has a triangular shape when viewed from the side of the vehicle body. The spring base mounting structure according to claim 3, wherein the connecting portion has a bead portion shaped in the vertical direction in a side view of the vehicle body. The protruding portion has a circular support bottom surface when viewed from the bottom surface, and an extension flange that wraps around from the support bottom surface to the inside of the vehicle inside the rear frame and is connected to the side wall inside the vehicle inside the rear frame. The spring base mounting structure according to claim 1. The spring base mounting structure according to claim 5, wherein the spring base includes a projecting surface that projects horizontally from the support bottom surface, and includes a drain hole that penetrates the projecting surface. Claim 1 is characterized in that the protruding portion and the connecting portion are separate members, and the connecting portion is covered and connected to the turning portion of the protruding portion from the outside of the vehicle. Spring base mounting structure described in. A circular spring support surface fixed to the support bottom surface of the protruding portion is provided.
The spring base mounting structure according to claim 5, wherein the spring support surface includes a spring upper end support portion whose central portion protrudes downward in a convex shape. A claim that the turning portion is provided with raised portions in which a fixed seat surface with the connecting portion is raised in a convex shape at predetermined intervals in a bending direction, and the connecting portion is connected to each raised portion. 7. The spring base mounting structure according to 7. The spring base mounting structure according to claim 3, wherein the connecting portion has an inclined surface that inclines downward toward the outside of the vehicle.

Images