Vehicle suspension structure

Abstract

To reduce stress concentration caused by loads in a vertical direction inputted to a hub carrier, so that the loads can be dispersed over surrounding members.SOLUTION: An axle suspension-type vehicular suspension structure comprises hub carriers 30 and a connection member 20 connecting the hub carriers 30 to each other. The hub carrier 30 has a cylindrical part 30a, where a spring installation portion 31a is provided above the cylindrical part 30a. A reinforcement member 50 extending to join the inside of the cylindrical part 30a to the connection member 20 is provided inside the cylindrical part 30a corresponding to the spring installation portion 31a. The reinforcement member 50 is joined to an inside surface 31c above the cylindrical part 30a to correspond to a curve shape of the inside surface 31c. In the reinforcement member 50 are formed a plurality of surfaces 51-53, where extension lines of ridge lines 50a and 50b formed at a boundary between adjacent surfaces extend to an outside surface of a bent portion 23 of the connection member 20.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a vehicle suspension structure.

Background Art

[0002] A De Dion type rear suspension, which is an example of an axle suspension type suspension, is arranged at the rear of a vehicle. Such a rear suspension has, for example, an axle beam and carriers provided at both ends of the axle beam and having hubs attached thereto, as disclosed in Patent Document 1. The hub is rotatably supported via a hub bearing provided on the carrier.

[0003] Further, the hub carrier is provided with a spring installation portion to which a suspension spring of the rear suspension is attached. Therefore, the hub carrier requires a predetermined strength against the load in the vertical direction of the vehicle. In this example, a detachable opening for attaching and detaching the hub bearing is formed on the inner surface of the hub carrier. Further, the hub carrier is provided with an upper overhanging portion and a lower overhanging portion provided above and below the detachable opening, and the upper overhanging portion and the lower overhanging portion are connected by a connecting portion extending in the vertical direction between the overhanging portions on both sides.

[0004] By configuring in this way, it is intended to suppress a decrease in the strength of the hub carrier in the vertical direction due to the formation of a large detachable opening. Further, in the rear suspension, even when a vertical load acts on the hub carrier due to the vehicle hitting a bump or the like, it is intended to prevent the hub carrier from being damaged.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The hub carrier in the above example maintains a certain strength against the load acting in the vehicle's vertical direction. As described above, not only the outer peripheral member of the hub carrier, but also an upper overhanging portion and a lower overhanging portion are provided, and a reinforcing structure is configured by connecting these. Therefore, the weight of the hub carrier increases in the structure of the above example.

[0007] In addition, since the increase in the weight of the hub carrier means an increase in the weight on the lower side of the suspension spring, it may also affect the vehicle's motion performance. Also, since the upper overhanging portion and the lower overhanging portion are provided on the hub carrier, the layout of the hub carrier is limited, and there is a possibility that the design freedom decreases. Therefore, there was room for improvement in the structure of the above example in order to reduce stress concentration and effectively disperse it to surrounding members with respect to the vehicle vertical load input from the suspension spring to the hub carrier.

[0008] The present invention has been made to solve the above problems, and its object is to provide a vehicle suspension structure capable of reducing stress concentration and effectively dispersing it to surrounding members with respect to the vehicle vertical load input from the suspension spring to the hub carrier.

Means for Solving the Problems

[0009] The vehicle suspension structure according to the present invention for achieving the above object is an axle suspension type vehicle suspension structure having a drive shaft extending in the vehicle width direction disposed therethrough, a hub carrier to which a hub for a wheel is attached, and a connecting member connecting the hub carriers on both sides in the vehicle width direction. In the vehicle suspension structure, a connecting portion connected to the hub carrier is provided at an outer portion of the connecting member in the vehicle width direction. An intermediate portion of the connecting member in the vehicle width direction is offset rearward of the vehicle from the drive shaft and extends in the vehicle width direction. A bent portion that bends forward of the vehicle and is connected to the connecting portion is provided at an outer portion of the intermediate portion in the vehicle width direction. The hub carrier has a cylindrical portion extending in the vehicle width direction, and a through hole through which the drive shaft penetrates is provided at an outer end of the cylindrical portion in the vehicle width direction. A spring installation portion for installing a suspension spring is provided at an upper portion of the cylindrical portion. A reinforcing member extending to connect the inside of the cylindrical portion and the connecting member is provided inside the cylindrical portion corresponding to the spring installation portion. The reinforcing member corresponds to a curved shape of an inner surface of an upper portion of the cylindrical portion and is joined to the inner surface. A plurality of surfaces are formed on the reinforcing member, and an extension line of a ridge line formed at a boundary between adjacent surfaces is connected to an outer surface of the bent portion of the connecting member.

Effects of the Invention

[0010] According to the present invention, it is possible to reduce stress concentration and effectively disperse it to surrounding members with respect to a vehicle vertical load input from a suspension spring to a hub carrier.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0012] Hereinafter, an embodiment of a vehicle suspension structure for a vehicle according to the present invention will be described with reference to the drawings (FIGS. 1 to 11). In the drawings, the direction of arrow Fr indicates the front in the vehicle longitudinal direction. In the description of the embodiment, "front part (front end) and rear part (rear end)" correspond to the front part and rear part in the vehicle longitudinal direction. Also, arrow R and arrow L indicate the right side and left side when the occupant looks at the front of the vehicle.

[0013] The vehicle suspension structure of the present embodiment will be described by taking the structure of an axle suspension type rear suspension 10 to which a rear wheel (wheel) 11 is attached as an example. As shown in FIGS. 1 and 11, the rear suspension 10 of the present embodiment has a hub carrier 30 in which a drive shaft 12 extending in the vehicle width direction is disposed through and a hub (not shown) to which the rear wheel 11 is fixed is provided, and a connecting member 20 that connects the hub carriers 30 on both sides in the vehicle width direction. The hub is rotatably attached to the hub carrier 30 via a hub bearing (not shown).

[0014] First, the connecting member 20 will be described. As shown in FIG. 1, the connecting member 20 is a member that extends in the vehicle width direction as a whole. A connecting portion 21 connected to the hub carrier 30 is provided on the outer side portion of the connecting member 20 in the vehicle width direction. Further, an intermediate portion 22 in the vehicle width direction of the connecting member 20 extends in the vehicle width direction offset rearward of the vehicle from a drive shaft 12 that transmits driving force to the rear wheel 11. A rod mounting bracket 15 to which a lateral rod 17 (FIG. 11) is attached is joined to the intermediate portion 22. Further, a bent portion 23 that bends rearward of the vehicle and is connected to the connecting portion 21 is provided on the outer side portion of the intermediate portion 22 in the vehicle width direction.

[0015] The bent portion 23 bends outward in the vehicle width direction as it goes forward of the vehicle. Further, the bent portion 23 extends obliquely outward in the vehicle width direction as it goes forward of the vehicle and is connected to the inner end in the vehicle width direction of the connecting portion 21. The connecting portion 21 extends in the vehicle width direction, and the outer end in the vehicle width direction of the connecting portion 21 is inserted and fixed into a second through hole 35b, which will be described later, of the hub carrier 30.

[0016] Next, the hub carrier 30 will be described. As shown in FIGS. 2 to 6, the hub carrier 30 of the present embodiment includes an upper member 31, a lower member 33, an outer member 35, an absorber receiving member 49, a front bracket 41, a rear bracket 45, and a reinforcing member 50. The upper member 31, the lower member 33, the outer member 35, and the reinforcing member 50 constitute the main body of the hub carrier 30, and a cylindrical portion 30a extending in the vehicle width direction is constituted by the upper member 31 and the lower member 33. The reinforcing member 50 extends so as to connect the inside of the cylindrical portion 30a and the connecting member 20. In FIGS. 2 to 11, the hub carrier 30 on the right side and the configuration around it are shown. Since the hub carrier 30 on the left side and the configuration around it are the same as those of the hub carrier 30 on the right side, the description thereof will be omitted here. Hereinafter, each member of the hub carrier 30 on the right side will be described.

[0017] The upper member 31 is formed of a metallic material, has a predetermined length in the vehicle width direction, is curved so as to protrude upward above the vehicle, and forms a substantially semi-circular shape protruding upward above the vehicle when viewed in the vehicle width direction. Further, a spring installation portion 31a for installing the suspension spring 19 is provided at the upper portion of the upper member 31. The spring installation portion 31a protrudes upward above the vehicle from the upper portion of the upper member 31 and has a substantially circular flat surface facing upward above the vehicle. The suspension spring 19 is installed on this surface (FIG. 11).

[0018] Further, the lower end portion at the front side portion of the upper member 31 extends in the vehicle width direction, and the lower member 33 is joined to this portion by, for example, welding or the like. Further, as shown in FIG. 2, the outer end portion in the vehicle width direction of the upper member 31 is formed in a substantially semi-circular shape as described above, and the outer member 35 is joined to this portion by welding or the like.

[0019] Further, an extension portion 31b protruding inward in the vehicle width direction is provided at the rear portion of the upper member 31 as shown in FIGS. 2 to 6. The extension portion 31b protrudes inward in the vehicle width direction at the rear portion of the cylindrical portion 30a, and the inner end in the vehicle width direction of the extension portion 31b extends along the longitudinal direction of the bent portion 23 of the connecting member 20. That is, the inner end in the vehicle width direction of the extension portion 31b is inclined inward in the vehicle width direction as it goes rearward of the vehicle. The inner end in the vehicle width direction of the extension portion 31b and the bent portion 23 of the connecting member 20 are formed so as to be continuous along the inclination direction. Further, the lower portion of the extension portion 31b is joined to the connecting member 20 as described above. Further, in this example, a part of the spring installation portion 31a is disposed in the extension portion 31b.

[0020] Further, the lower end portion at the rear side portion of the upper member 31 and the lower end portion at the rear side portion of the extension portion 31b extend so as to be continuous in the vehicle width direction, and this portion is joined to the upper surfaces of the connecting portion 21 and the bent portion 23 of the connecting member 20 by welding or the like. Further, a reinforcing member 50 is provided inside the upper member 31. Details of the reinforcing member 50 will be described later.

[0021] As shown in FIGS. 2 to 6, the lower member 33 is a member disposed on the vehicle lower side of the upper member 31 and is formed of a metal material. The lower member 33 has a predetermined length in the vehicle width direction, similar to the upper member 31. Further, the lower member 33 forms a substantially semi-circular shape that opens upward in the vehicle in a view in the vehicle width direction. The upper end portion at the front side of the lower member 33 extends in the vehicle width direction, and the lower end portion at the front side of the upper member 31 is joined to this portion as described above. Also, the outer end portion in the vehicle width direction of the lower member 33 is formed in a substantially semi-circular shape as described above, and the outer member 35 is joined to this portion by welding or the like, similar to the upper member 31. Furthermore, the upper end portion at the rear side of the lower member 33 extends in the vehicle width direction, and the lower surface of the connecting portion 21 of the connecting member 20 is joined to this portion by welding or the like.

[0022] As shown in FIGS. 2 and 4, the upper member 31 and the lower member 33 are joined to form a hollow main body having a so-called monaka structure. A cylindrical portion 30a extending in the vehicle width direction is formed in the main body. The cylindrical portion 30a and the connecting portion 21 of the connecting member 20 extend in the vehicle width direction and are parallel to each other. A width direction opening 30b extending in the vehicle width direction is provided at the rear portion of the cylindrical portion 30a. In this example, in a state where the upper member 31 and the lower member 33 are joined, when viewed from the inner side in the vehicle width direction, a so-called C-shaped opening is formed at the rear of the vehicle as shown in FIG. 2.

[0023] In the present embodiment, the lower end portion at the rear side of the upper member 31 and the upper end portion at the rear side of the lower member 33 are arranged at intervals from each other in the vehicle vertical direction, and this interval serves as the width direction opening 30b. Also, the connecting portion 21 of the connecting member 20 is fixed to the rear portion of the cylindrical portion 30a while being disposed within the width direction opening 30b. In this example, the upper surface and the lower surface of the connecting portion 21 of the connecting member 20 are joined to the opening edges of the width direction opening 30b portion.

[0024] As described above, a reinforcing member 50 is provided inside the upper part of the cylindrical portion 30a (the upper side member 31). As shown in FIGS. 2 to 7, the reinforcing member 50 extends so as to connect the inner surface 31c of the upper side member 31 and the bent portion 23 of the connecting member 20. The reinforcing member 50 is formed so as to correspond to the curved shape of the inner surface 31c of the upper side member 31. The curved shape corresponds to the arc shape of the inner surface 31c of the upper side member 31 in a side view of the vehicle (FIG. 4). In the present embodiment, the inner end portion in the vehicle width direction at the upper part of the reinforcing member 50 is formed so as to correspond to the shape of the inner end portion in the vehicle width direction (the extended portion 31b) on the inner surface 31c of the upper side member 31. That is, the inner end portion in the vehicle width direction at the upper part of the reinforcing member 50 is inclined inward in the vehicle width direction and downward in the vehicle as it goes rearward in the vehicle. The inner end portion in the vehicle width direction at the upper part of the reinforcing member 50 formed in this way and the inner end portion in the vehicle width direction (the extended portion 31b) on the inner surface 31c of the upper side member 31 are joined by welding or the like. The lower part of the reinforcing member 50 is joined to the outer surface of the bent portion 23 of the connecting member 20 by welding or the like.

[0025] Specifically, as shown in the enlarged perspective view of FIG. 7, the reinforcing member 50 is a plate-like member formed of a metal material and has a plurality (for example, three in this case) of surfaces 51, 52, 53. The first surface 51 of the reinforcing member 50 is formed to face the inside of the vehicle, and the second surface 52 is formed to face the front of the vehicle. A first ridge line 50a is provided at the boundary between the first surface 51 and the second surface 52. The first ridge line 50a extends obliquely inward in the vehicle width direction and rearward in the vehicle as it goes downward in the vehicle from the position corresponding to the spring installation portion 31a on the inner surface 31c of the upper side member 31. The direction in which the extension line of the first ridge line 50a extends is the tangential direction at the point P where the extension line contacts the outer surface of the connecting member 20, as shown in FIG. 9 (a perspective cross-sectional view cut along the line A-A in FIG. 8). That is, the extension line of the first ridge line 50a is smoothly continuous with the outer surface of the bent portion 23 of the connecting member 20. Note that the line A-A in FIG. 8 is a line along the first ridge line 50a. The upper rear end portion of the first surface 51 is joined to the inner end portion in the vehicle width direction on the inner surface 31c of the upper side member 31 by the first weld portion W1 (FIG. 7).

[0026] As shown in FIG. 7, the third surface 53 of the reinforcing member 50 extends along the lower part of the first surface 51 and the lower part of the second surface 52. The inner end in the vehicle width direction of the third surface 53 is connected so as to be continuous with the outer surface of the bent portion 23 of the connecting member 20. In the present embodiment, the third surface 53 extends along the outer surface of the bent portion 23 (FIG. 6). A second ridge line 50b is provided at the boundary between the third surface 53 and the first surface 51 and the second surface 52. The second ridge line 50b gently curves rearward of the vehicle near the position where it intersects the extension line of the first ridge line. As shown in FIG. 10 (a perspective cross-sectional view cut along the line B-B in FIG. 8), the second ridge line 50b extends along the longitudinal direction of the bent portion 23 of the connecting member 20. Note that the line B-B in FIG. 8 is a line along the second ridge line 50b. The lower end portion located on the inner side in the vehicle width direction of the third surface 53 is joined to the outer surface of the bent portion 23 of the connecting member 20 by the second welding portion W2 (FIG. 7). Further, the lower end portion located on the outer side in the vehicle width direction of the third surface 53 is joined to the outer surface of the bent portion 23 of the connecting member 20 by the third welding portion W3. The third welding portion W3 is formed so as to wrap around from the lower end portion of the third surface 53 to the corner portion on the outer side in the vehicle width direction.

[0027] As shown in FIGS. 2 to 6, the outer member 35 is a member formed of a metal material and attached to the outer side in the vehicle width direction of the upper member 31 and the lower member 33. It closes the vehicle width direction end of the cylindrical portion 30a and is a plate-like member extending in the vehicle longitudinal direction. The outer member 35 has a first through hole (through hole) 35a through which the drive shaft 12 is disposed, and a second through hole 35b to which the connecting member 20 is attached. A fixing member 37 is fixed around the first through hole 35a. The fixing member 37 is a plate-like member having a through hole formed in the center, and the through hole communicates with the first through hole 35a.

[0028] In the cylindrical portion 30a of the present embodiment, an arm attachment portion 30d to which a trailing arm 14 extending in the vehicle front-rear direction is attached is provided (FIG. 11). The arm attachment portion 30d has a front bracket 41 and a rear bracket 45, and these brackets are configured to surround a part of the cylindrical portion 30a from below the vehicle. A shock absorber receiving member 49 (FIGS. 2 to 6) on which a shock absorber 18 (FIG. 11) is installed is joined to the rear bracket 45. The shock absorber receiving member 49 is also joined to the rear surface of the bent portion 23 of the connecting member 20.

[0029] Further, in the present embodiment, a hub fixing portion 38 is provided on the outer side portion in the vehicle width direction of the cylindrical portion 30a. In this example, the hub fixing portion 38 is provided on the fixing member 37 fixed to the outer member 35 as described above. Also, the hub is fixed to the hub fixing portion 38 in a region inside the cylinder on the outer side in the vehicle width direction of the cylindrical portion 30a.

[0030] Next, the operation of the vehicle suspension structure of the present embodiment will be described. In the vehicle suspension structure of the present embodiment configured as described above, the spring installation portion 31a is provided at the upper part of the cylindrical portion 30a constituted by the upper member 31 and the lower member 33. Also, the lower end portion at the rear side of the upper member 31 is joined to the connection portion 21 of the connecting member 20. That is, in the present embodiment, the spring installation portion 31a is connected to the connecting member 20 via the cylindrical rear wall portion of the upper member 31. By forming the hub carrier 30 in a cylindrical shape, as shown by the white arrow in FIG. 11, it is possible to reduce stress concentration with respect to the load input from the suspension spring 19 and disperse the stress due to the load to the highly rigid trailing arm 14 and connecting member 20. As a result, it is possible to improve the rigidity and strength of the hub carrier 30.

[0031] In addition, in the present embodiment, the reinforcing member 50 extends so as to connect the inner side of the upper member 31 corresponding to the spring installation portion 31a and the connecting member 20. By providing such a reinforcing member 50, the stress caused by the load input from the suspension spring 19 is transmitted to the connecting member 20 not only through the upper member 31 of the hub carrier 30 but also through the reinforcing member 50. As a result, the deformation of the hub carrier 30 can be suppressed, and it is possible to prevent the performance degradation of the rear suspension 10. Further, the reinforcing member 50 is formed with a plurality of surfaces 51 to 53 and ridge lines 50a and 50b installed between the upper member 31 and the connecting member 20, so that the strength of the reinforcing member 50 is increased and the stress transmission efficiency can be improved. Furthermore, since the extension lines of the ridge lines 50a and 50b of the reinforcing member 50 are connected to the outer surface of the bent portion 23 of the connecting member 20, stress concentration can be prevented, and the stress can be efficiently dispersed with respect to the connecting member 20.

[0032] In the vehicle suspension structure of the present embodiment, the first ridge line 50a between the first surface 51 and the second surface 52 of the reinforcing member 50 extends while inclining inward in the vehicle width direction and rearward in the vehicle as it goes downward from the spring installation portion 31a, and the direction in which the extension line of the first ridge line 50a extends is configured to be the tangential direction at the point where the extension line contacts the outer surface of the connecting member 20. In such a configuration of the reinforcing member 50, the extension line of the first ridge line 50a is smoothly continuous with the outer surface of the connecting member 20, so that the deformation of the upper member 31 of the cylindrical hub carrier 30 can be effectively suppressed, and stress concentration at the joint portion (the second welding portion W2) between the lower end portion located inward in the vehicle width direction of the reinforcing member 50 and the connecting member 20 can be prevented.

[0033] In the vehicle suspension structure of the present embodiment, the inner end in the vehicle width direction at the upper part of the reinforcing member 50 (the end at the upper rear side of the first surface 51) is formed to correspond to the shape of the inner end in the vehicle width direction (the extended portion 31b) of the inner surface 31c of the upper part (the upper member 31) of the cylindrical portion 30a, and the respective ends are joined. Further, the inner end in the vehicle width direction at the lower part of the reinforcing member 50 is connected so as to be continuous with the outer surface of the bent portion 23 of the connecting member 20. According to such a reinforcing member 50, the stress due to the load input from the suspension spring 19 is efficiently dispersed to the reinforcing member 50 through the joint portion (the first welding portion W1) of the upper member 31 and the reinforcing member 50 and transmitted to the connecting member 20. Therefore, the deformation of the upper member 31 of the cylindrical hub carrier 30 can be further effectively suppressed. In addition, stress concentration at the joint portion (the first welding portion W1) of the upper member 31 and the reinforcing member 50 and at the joint portions (the second and third welding portions W2, W3) of the reinforcing member 50 can be prevented.

[0034] Also, in the vehicle suspension structure of the present embodiment, the reinforcing member 50 has a third surface 53 and a second ridge line 50b, the third surface 53 is joined to the connecting member 20, and the second ridge line 50b extends along the longitudinal direction of the bent portion 23 of the connecting member 20. According to such a reinforcing member 50, the stress transmitted to the first surface 51, the second surface 52, and the first ridge line 50a of the reinforcing member 50 can be more efficiently transmitted to the connecting member 20 through the third surface 53 and the second ridge line 50b, and stress concentration in the hub carrier 30 and the reinforcing member 50 can be more effectively prevented.

[0035] The description of the present embodiment is an exemplification for explaining the present invention and does not limit the invention described in the claims. Further, the respective component configurations of the present invention are not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims.

[0036] In this embodiment, the cylindrical portion 30a of the hub carrier 30 is composed of the upper member 31 and the lower member 33 arranged vertically, but it is not limited to this. The cylindrical portion 30a may be composed of one member. Further, although an example in which the reinforcing member 50 has three surfaces 51 to 53 is shown, the reinforcing member 50 may have two surfaces or four or more surfaces, and the number of ridge lines can be appropriately set according to the number of the surfaces. Furthermore, although an example in which the reinforcing member 50 is joined to the end portion on the inner side in the vehicle width direction of the inner surface 31c of the upper member 31 is shown, the joining position between the inner surface 31c of the upper member 31 and the reinforcing member 50 is not limited to the above example, and the reinforcing member 50 can be joined to any position of the inner surface 31c corresponding to the spring installation portion 31a.

Explanation of Signs

[0037] 10 Rear suspension 11 Rear wheel 12 Drive shaft 14 Trailing arm 15 Rod mounting bracket 17 Lateral rod 18 Shock absorber 19 Suspension spring 20 Connecting member 21 Connection part 22 Intermediate part 23 Bending part 30 Hub carrier 30a Cylindrical portion 30b Opening in width direction 30d Arm mounting part 31 Upper member 31a Spring installation part 31b Expansion part 33 Lower member 35 Outer member 35a First through hole (through hole) 35b Second through hole 37 Fixing member 38 Hub fixing part 41 Front bracket 45 Rear bracket 49 Absorber receiving member 50 Reinforcing member 50a First ridge line 50b Second ridge line 51 First surface 52 Second surface 53 Third surface

Claims

1. In a vehicle suspension structure of an axle suspension type, having a hub carrier through which a drive shaft extending in the vehicle width direction is disposed and to which a hub for a wheel is attached, and a connecting member connecting the hub carriers on both sides in the vehicle width direction, a connecting portion connected to the hub carrier is provided on the outer side in the vehicle width direction of the connecting member, the intermediate portion in the vehicle width direction of the connecting member is offset rearward of the vehicle from the drive shaft and extends in the vehicle width direction, and a bent portion that bends forward of the vehicle and is connected to the connecting portion is provided on the outer side in the vehicle width direction of the intermediate portion, the hub carrier has a cylindrical portion extending in the vehicle width direction, and a through hole through which the drive shaft passes is provided at the outer end in the vehicle width direction of the cylindrical portion, a spring installation portion for installing a suspension spring is provided on the upper portion of the cylindrical portion, a reinforcing member extending so as to connect the inside of the cylindrical portion and the connecting member is provided inside the cylindrical portion corresponding to the spring installation portion, the reinforcing member corresponds to the curved shape of the inner surface of the upper portion of the cylindrical portion and is joined to the inner surface, the reinforcing member has a plurality of surfaces, and an extension line of a ridge line formed at a boundary between adjacent surfaces is connected to the outer surface of the bent portion of the connecting member. A vehicle suspension structure characterized by this.

2. The plurality of surfaces include a first surface facing the inside of the vehicle and a second surface facing the front of the vehicle, the ridge line includes a first ridge line that is a boundary between the first surface and the second surface, the first ridge line extends obliquely inward in the vehicle width direction and rearward in the vehicle as it goes downward from the spring installation portion, The direction in which the extension line of the first ridge line extends is a tangent direction at a point where the extension line contacts the outer surface of the connecting member. The vehicle suspension structure according to claim 1, characterized by this.

3. The inner end in the vehicle width direction at the upper portion of the reinforcing member is formed to correspond to the shape of the inner end in the vehicle width direction on the inner surface of the upper portion of the cylindrical portion, the inner end in the vehicle width direction at the upper portion of the reinforcing member and the inner end in the vehicle width direction on the inner surface of the upper portion of the cylindrical portion are joined, The inner end in the vehicle width direction at the lower portion of the reinforcing member is connected so as to be continuous with the outer surface of the bent portion. The vehicle suspension structure according to claim 1 or claim 2, characterized by this.

4. The plurality of surfaces includes a third surface extending along the lower portions of the first surface and the second surface, and the third surface is joined to the connecting member. The ridge line includes a second ridge line that is a boundary between the third surface and the first and second surfaces, and the second ridge line extends along the longitudinal direction of the bent portion. The vehicle suspension structure according to claim 2, characterized in that.

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