Vehicle lower part structure

Abstract

To obtain a vehicle lower part structure which can achieve improvement of riding quality of a vehicle.SOLUTION: A vehicle 10 includes: a rocker 22 forming a part of a vehicle lower side in a vehicle side part 10A and arranged along a vehicle front-back direction; and a reinforcement part 34 including a body part 42 provided in the rocker 22 and a first protruding part 36B, a first protruding part 38B, a second protruding part 36C, and a second protruding part 38C protruding from the body part 42 in a vehicle vertical direction and joined to a wall surface of the rocker 22 located at the protruding direction side.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] The following Patent Document 1 discloses an invention related to a vehicle body underbody structure. In this vehicle body underbody structure, a box-shaped bulkhead is provided inside the rocker.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when the rigidity of the rocker against the load in the vehicle vertical direction is small, it is conceivable that during the running of the vehicle, the cross section of the rocker deforms so as to expand and contract in the vehicle vertical direction, and road noise is propagated to the passenger side, deteriorating the riding comfort of the vehicle.

[0005] In this regard, in the above prior art, since the rocker and the bulkhead are not directly joined, the bulkhead does not contribute to ensuring the rigidity of the rocker. Further, although the upper side and the lower side of the rocker in the vehicle are connected by a plate-shaped stiffener, there is room for improvement from the viewpoint of ensuring the rigidity of the rocker against the load in the vehicle vertical direction.

[0006] In consideration of the above facts, an object of the present invention is to obtain a vehicle underbody structure capable of improving the riding comfort of a vehicle.

Means for Solving the Problems

[0007] The vehicle lower structure according to the first aspect constitutes a part of the lower side of the vehicle on the vehicle side, and includes a rocker disposed along the vehicle longitudinal direction, a main body portion provided in the rocker, and a reinforcing portion including a protruding portion that protrudes in the vehicle vertical direction from the main body portion and is joined to a wall surface of the rocker located on the protruding direction side.

[0008] According to the vehicle lower structure according to the first aspect, a part of the lower side of the vehicle on the vehicle side is constituted by a rocker, and this rocker is disposed along the vehicle longitudinal direction.

[0009] By the way, when the rigidity of the rocker against the load in the vehicle vertical direction is small, it is conceivable that during the running of the vehicle, the cross section of the rocker deforms so as to expand and contract in the vehicle vertical direction, and the road noise is propagated to the passenger side, deteriorating the riding comfort of the vehicle.

[0010] Here, in this aspect, the rocker is reinforced by a reinforcing portion including a main body portion and a protruding portion. Specifically, the main body portion is provided in the rocker, and the protruding portion protrudes in the vehicle vertical direction from the main body portion and is joined to a wall surface of the rocker located on the protruding direction side of the protruding portion.

[0011] Therefore, when a load in the vehicle vertical direction is input to the rocker during the running of the vehicle and the cross section of the rocker is about to deform so as to expand and contract in the vehicle vertical direction, the protruding portion and the main body portion serve as a resistance to the deformation of the rocker. As a result, it becomes difficult for the rocker to deform due to the load. That is, in this aspect, the rigidity of the rocker against the load in the vehicle vertical direction can be improved by the reinforcing portion.

[0012] The vehicle lower structure according to the second aspect is the vehicle lower structure according to the first aspect, wherein the main body portion is an impact absorption portion whose interior is partitioned in the vehicle width direction, a first protruding portion as the protruding portion protrudes upward from the impact absorption portion and is joined to an upper portion of the rocker on the vehicle side, and a second protruding portion as the protruding portion protrudes downward from the impact absorption portion and is joined to a lower portion of the rocker on the vehicle side.

[0013] According to the vehicle underbody structure according to the second aspect, it includes a shock absorber portion whose interior is partitioned in the vehicle width direction, and a plurality of space portions are formed in the shock absorber portion in the vehicle width direction. Therefore, when a collision load in the vehicle width direction is input, the peripheral portion of the space portion in the shock absorber portion can be crushed to absorb shock energy.

[0014] Also, in this aspect, the first protruding portion protrudes upward from the shock absorber portion of the vehicle and is joined to the upper portion of the rocker on the vehicle side, and the second protruding portion protrudes downward from the shock absorber portion of the vehicle and is joined to the lower portion of the rocker on the vehicle side. Therefore, the rigidity of the rocker against loads in the vehicle vertical direction can be further improved.

[0015] The vehicle underbody structure according to the third aspect is the vehicle underbody structure according to the second aspect, wherein the first protruding portion and the second protruding portion are arranged in a set in the vehicle vertical direction, and the set first protruding portion and the second protruding portion are arranged on the same side in the vehicle width direction with respect to the center of the rocker in the vehicle width direction.

[0016] According to the vehicle underbody structure according to the third aspect, the first protruding portion and the second protruding portion are arranged in a set in the vehicle vertical direction. And the set first protruding portion and the second protruding portion are arranged on the same side in the vehicle width direction with respect to the center of the rocker in the vehicle width direction.

[0017] Therefore, the load received by the first protruding portion from the upper portion of the rocker on the vehicle side can be supported by the second protruding portion, and the load received by the second protruding portion from the lower portion of the rocker on the vehicle side can be supported by the first protruding portion. As a result, for example, compared with a configuration in which the protruding portions are not arranged in a set in the vehicle vertical direction, the rigidity of the rocker against loads in the vehicle vertical direction can be improved.

[0018] The vehicle underbody structure according to the fourth aspect is the vehicle underbody structure according to any one of the first aspect to the third aspect, wherein the main body portion is joined to the portion outside the rocker in the vehicle width direction and the portion inside the rocker in the vehicle width direction.

[0019] According to the vehicle underbody structure according to the fourth aspect, the main body is joined to the outer part and the inner part in the vehicle width direction of the rocker, and the expansion and contraction of the rocker in the vehicle width direction is restricted by the main body. Therefore, the rigidity of the rocker against the load in the vehicle up and down direction can be further improved.

[0020] The vehicle underbody structure according to the fifth aspect is the vehicle underbody structure according to any one of the first aspect to the fourth aspect, wherein the reinforcing part is provided in the rocker and further includes a shared panel that extends in both the up and down directions of the vehicle and connects the upper part and the lower part of the rocker in the vehicle.

[0021] According to the vehicle underbody structure according to the fifth aspect, the reinforcing part includes a shared panel provided in the rocker. This shared panel extends in the vehicle up and down direction, and the upper part and the lower part of the rocker in the vehicle are connected by this shared panel. Therefore, the expansion and contraction of the rocker in the vehicle up and down direction is restricted by the shared panel, and as a result, the rigidity of the rocker against the load in the vehicle up and down direction can be further improved.

[0022] The vehicle underbody structure according to the sixth aspect is the vehicle underbody structure according to any one of the first aspect to the fifth aspect, wherein the protruding part is integrally formed with at least one of the upper part and the lower part of the main body in the vehicle.

[0023] According to the vehicle underbody structure according to the sixth aspect, the protruding part is integrally formed with at least one of the upper part and the lower part of the main body in the vehicle. Therefore, the number of parts constituting the vehicle can be reduced, and the manufacturing process of the vehicle can be simplified.

[0024] The vehicle underbody structure according to the seventh aspect is the vehicle underbody structure according to the sixth aspect, wherein the part of the main body where the protruding part is provided and the protruding part are made of the same plate material.

[0025] According to the vehicle underbody structure according to the seventh aspect, by bending a plate material, the main body portion and the protruding portion can be integrally formed, and as a result, further simplification of the vehicle manufacturing process can be achieved.

[0026] The vehicle underbody structure according to the eighth aspect is the vehicle underbody structure according to any one of the first aspect to the seventh aspect, in which a joint surface joined to the rocker in the protruding portion and a portion of the rocker joined to the joint surface are in a parallel state when viewed from the vehicle front-rear direction.

[0027] According to the vehicle underbody structure according to the eighth aspect, a joint surface joined to the rocker in the protruding portion and a portion of the rocker joined to the joint surface are in a parallel state when viewed from the vehicle front-rear direction, and the protruding portion and the rocker can be brought into surface contact. Therefore, when a load in the vehicle vertical direction is input, generation of a stress concentration portion at the contact portion between the rocker and the protruding portion can be suppressed, and the rigidity of the rocker with respect to the load in the vehicle vertical direction can be further improved.

Effects of the Invention

[0028] As described above, the vehicle underbody structure according to the present invention has an excellent effect of being able to improve the ride comfort of the vehicle.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0030] <First Embodiment> Hereinafter, a first embodiment of the vehicle lower structure according to the present invention will be described with reference to FIGS. 1 and 2. Note that the arrow FR appropriately shown in each figure indicates the front side of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow LH indicates the left side in the vehicle width direction.

[0031] First, the schematic configuration of the "vehicle 10" to which the vehicle lower structure according to the present embodiment is applied will be described. In the present embodiment, since the vehicle 10 basically has a bilaterally symmetric configuration, hereinafter, the configuration of the left side portion in the vehicle width direction of the vehicle 10 will be mainly described, and the description of the configuration of the right side portion in the vehicle width direction will be omitted as appropriate.

[0032] The vehicle 10 includes a vehicle body 12, a power unit such as a motor (not shown) mounted on the vehicle 10, and a battery pack 14 attached to the vehicle body 12. The power unit is configured to be driven by receiving power supply from the battery pack 14, and the vehicle 10 travels by the driving force generated by this power unit.

[0033] The vehicle body 12 includes a passenger compartment 16, and the lower portion thereof is configured by a floor portion 18. This floor portion 18 includes a floor panel 20, a "rocker 22", and a side member 24.

[0034] Specifically, the floor panel 20 is formed by pressing a steel plate and extends in the vehicle longitudinal direction and the vehicle width direction when viewed from the vehicle up-down direction. And, on the outer side of the floor panel 20 in the vehicle width direction, a pair of rockers 22 are arranged along the vehicle longitudinal direction at the peripheral edge portion on the outer side of the floor panel 20 in the vehicle width direction. Note that this rocker 22 constitutes a part of the lower side of the "vehicle side portion 10A".

[0035] The rocker 22 is made of steel, extends in the vehicle longitudinal direction, and includes a rocker outer panel 26 that constitutes the portion on the outer side in the vehicle width direction thereof and a rocker inner panel 28 that constitutes the portion on the inner side in the vehicle width direction thereof.

[0036] Specifically, the rocker outer panel 26 includes an upper wall portion 26A that constitutes the portion on the upper side of the vehicle, a side wall portion 26B that constitutes the portion on the outer side in the vehicle width direction thereof, a lower wall portion 26C that constitutes the portion on the lower side of the vehicle, and a pair of flange portions 26D. Further, the cross-sectional shape of the rocker outer panel 26 when viewed from the vehicle longitudinal direction is in a hat shape with the inner side in the vehicle width direction open.

[0037] On the other hand, the rocker inner panel 28 includes an upper wall portion 28A that constitutes the portion on the upper side of the vehicle, a side wall portion 28B that constitutes the portion on the inner side in the vehicle width direction thereof, a lower wall portion 28C that constitutes the portion on the lower side of the vehicle, and a pair of flange portions 28D. Further, the cross-sectional shape of the rocker inner panel 28 when viewed from the vehicle longitudinal direction is in a hat shape with the outer side in the vehicle width direction open. Note that an end portion 20A on the outer side of the floor panel 20 in the vehicle width direction is joined to the side wall portion 28B at a joining portion (not shown) such as by welding.

[0038] And, the flange portion 26D of the rocker outer panel 26 and the flange portion 28D of the rocker inner panel 28 are joined at a joining portion (not shown) such as by welding, whereby the rocker 22 has a closed cross-section structure with a substantially hexagonal cross-sectional shape when viewed from the vehicle longitudinal direction.

[0039] The side member 24 is made of steel and extends in the longitudinal direction of the vehicle. It is disposed on both sides in the vehicle width direction of the floor panel 20 below the vehicle. Note that the side member 24 is located on the inner side in the vehicle width direction with respect to the rocker 22.

[0040] The cross-sectional shape of the side member 24 as viewed from the longitudinal direction of the vehicle is in a hat shape with the upper side of the vehicle open, and its flange portion 24A is joined to the floor panel 20 by a joint portion (not shown) such as welding. Further, the side member 24, by being joined to the floor panel 20, constitutes a closed cross-section structure portion together with the floor panel 20. And in the present embodiment, the battery pack 14 is attached to the side member 24.

[0041] The battery pack 14 includes a battery case 30 mainly made of an aluminum alloy and a battery module (not shown) disposed inside the battery case 30.

[0042] The battery case 30 includes a main body portion 30A in which the battery module is accommodated and a base portion 30B that constitutes the lower portion of the vehicle of the battery case 30. And the battery case 30 is fixed to the vehicle body 12 by the base portion 30B being attached to the side member 24 by a mounting member (not shown) in a state where the main part of the main body portion 30A is accommodated between the side members 24 and a mounting member 32 is interposed between the base portion 30B and the side member 24. Note that the battery pack 14 is in a state where a part thereof overlaps with the rocker 22 when viewed from the vehicle width direction.

[0043] Here, in the present embodiment, the rocker 22 is characterized in that it is reinforced by a "reinforcement portion 34" provided in the rocker 22. Hereinafter, the configuration of the reinforcement portion 34 will be described in detail.

[0044] The reinforcing portion 34 is composed of a steel outer reinforcing member 36, a steel inner reinforcing member 38, and a steel "shared panel 40". The outer reinforcing member 36 is formed by pressing a single steel plate and extends in the vehicle longitudinal direction. It includes a base portion 36A that constitutes the main part thereof, a "first protruding portion 36B" as a protruding portion, and a "second protruding portion 36C" as a protruding portion.

[0045] The base portion 36A includes an upper wall portion 36A1 that constitutes the upper part of the vehicle thereof, a side wall portion 36A2 that constitutes the outer part in the vehicle width direction thereof, a lower wall portion 36A3 that constitutes the lower part of the vehicle thereof, and a pair of flange portions 36A4. That is, the base portion 36A has a hat-shaped cross-sectional shape when viewed from the vehicle longitudinal direction with the inner side in the vehicle width direction being open. And the side wall portion 36A2 is joined to the side wall portion 26B of the rocker outer panel 26 by a joining portion (not shown) such as welding.

[0046] The first protruding portion 36B is formed at the center in the vehicle width direction of the upper wall portion 36A1 and extends in the vehicle longitudinal direction. It has a U-shaped cross-section that protrudes upward from the upper wall portion 36A1 when viewed from the vehicle longitudinal direction and is open at the lower side of the vehicle.

[0047] Also, the "upper surface 36B1" of the first protruding portion 36B is a joint surface with the upper wall portion 26A of the rocker outer panel 26 and is in a parallel state with the upper wall portion 26A when viewed from the vehicle longitudinal direction. And the upper surface 36B1 of the first protruding portion 36B and the wall surface of the upper wall portion 26A of the rocker outer panel 26 are joined by a joining portion (not shown) such as friction stir welding.

[0048] The second protruding portion 36C is formed at the center in the vehicle width direction of the lower wall portion 36A3 and extends in the vehicle longitudinal direction. It has a U-shaped cross-section that protrudes downward from the lower wall portion 36A3 when viewed from the vehicle longitudinal direction and is open at the upper side of the vehicle.

[0049] Further, the "lower surface 36C1" of the second protruding portion 36C is a joint surface with the lower wall portion 26C of the rocker outer panel 26, and is in a state parallel to the lower wall portion 26C when viewed in the vehicle front-rear direction. The lower surface 36C1 of the second protruding portion 36C and the wall surface of the lower wall portion 26C of the rocker outer panel 26 are joined by a joint portion (not shown) such as friction stir welding.

[0050] Note that the first protruding portion 36B and the second protruding portion 36C are arranged in a set so as to overlap when viewed in the vehicle vertical direction, and they are located outside the vehicle width direction with respect to the center of the rocker 22 in the vehicle width direction, more specifically, the centroid G of the cross section of the rocker 22 when viewed in the vehicle front-rear direction.

[0051] On the other hand, the inner reinforcing member 38 is formed by pressing a single steel plate and extends in the vehicle front-rear direction, and includes a base portion 38A that constitutes its main part, a "first protruding portion 38B" as a protruding portion, and a "second protruding portion 38C" as a protruding portion.

[0052] The base portion 38A includes an upper wall portion 38A1 that constitutes the upper portion of the vehicle, a side wall portion 38A2 that constitutes the inner portion in the vehicle width direction, a lower wall portion 38A3 that constitutes the lower portion of the vehicle, and a pair of flange portions 38A4. That is, the base portion 38A has a hat shape with the outside in the vehicle width direction open when viewed in the cross section in the vehicle front-rear direction. The side wall portion 38A2 is joined to the side wall portion 28B of the rocker inner panel 28 by a joint portion (not shown) such as welding.

[0053] The first protruding portion 38B is formed at the center in the vehicle width direction of the upper wall portion 38A1 and extends in the vehicle front-rear direction, and has a U shape that protrudes upward from the upper wall portion 38A1 when viewed in the vehicle front-rear direction and is open at the lower side of the vehicle.

[0054] Further, the "upper surface 38B1" of the first protrusion 38B is a joint surface with the upper wall portion 28A of the rocker inner panel 28, and is in a state parallel to the upper wall portion 28A when viewed in the vehicle front-rear direction. The upper surface 38B1 of the first protrusion 38B and the upper wall portion 28A of the rocker inner panel 28 are joined by a joint portion (not shown) such as friction stir welding.

[0055] The second protrusion 38C is formed at the center in the vehicle width direction of the lower wall portion 38A3 and extends in the vehicle front-rear direction. When viewed in the vehicle front-rear direction, it protrudes downward from the lower wall portion 38A3 and has a U-shaped configuration with the upper side open.

[0056] Also, the "lower surface 38C1" of the second protrusion 38C is a joint surface with the lower wall portion 28C of the rocker inner panel 28, and is in a state parallel to the lower wall portion 28C when viewed in the vehicle front-rear direction. The lower surface 38C1 of the second protrusion 38C and the lower wall portion 28C of the rocker inner panel 28 are joined by a joint portion (not shown) such as friction stir welding.

[0057] In addition, the first protrusion 38B and the second protrusion 38C are arranged in a set so as to overlap when viewed in the vehicle up-down direction, and they are located inside the vehicle width direction with respect to the centroid G when viewed in the vehicle front-rear direction.

[0058] The shared panel 40 is in a plate shape extending in the vehicle up-down direction and the vehicle front-rear direction, and connects the upper portion and the lower portion of the rocker 22 in the vehicle up-down direction.

[0059] Specifically, the upper end portion 40A of the shared panel 40 is sandwiched between the upper flange portion 26D of the rocker outer panel 26 and the upper flange portion 28D of the rocker inner panel 28, and is joined to them by a joint portion (not shown) such as welding.

[0060] Further, the portion immediately below the upper end portion 40A of the shared panel 40 is joined to the upper vehicle-side flange portion 36A4 of the outer reinforcing member 36 and the upper vehicle-side flange portion 38A4 of the inner reinforcing member 38 by a joint portion (not shown) such as welding while being sandwiched therebetween.

[0061] On the other hand, the lower end portion 40B of the shared panel 40 is joined to the lower vehicle-side flange portion 26D of the rocker outer panel 26 and the lower vehicle-side flange portion 28D of the rocker inner panel 28 by a joint portion (not shown) such as welding while being sandwiched therebetween.

[0062] Further, the portion immediately above the lower end portion 40B of the shared panel 40 is joined to the lower vehicle-side flange portion 36A4 of the outer reinforcing member 36 and the lower vehicle-side flange portion 38A4 of the inner reinforcing member 38 by a joint portion (not shown) such as welding while being sandwiched therebetween.

[0063] Further, hereinafter, the assembly of the base portion 36A of the outer reinforcing member 36, the base portion 38A of the inner reinforcing member 38, and the shared panel 40 will be referred to as the "main body portion 42". The interior of this main body portion 42 is partitioned in the vehicle width direction, thereby forming a plurality of space portions extending in the vehicle front-rear direction. And these space portions serve as the crush allowances of the base portion 36A and the base portion 38A when a collision load is input in the vehicle width direction, and the main body portion 42 functions as a shock absorption portion.

[0064] (Operations and Effects of the Present Embodiment) Next, the operations and effects of the present embodiment will be described.

[0065] In the present embodiment, as shown in FIG. 1, a part of the lower side of the vehicle side portion 10A is constituted by the rocker 22, and this rocker 22 is arranged along the vehicle front-rear direction.

[0066] Incidentally, when the rigidity of the rocker 22 with respect to the load in the vehicle vertical direction is small, during the running of the vehicle 10, the cross-section of the rocker 22 deforms so as to expand and contract in the vehicle vertical direction, and it is conceivable that road noise is propagated to the passenger side, deteriorating the ride comfort of the vehicle 10.

[0067] Here, in the present embodiment, the rocker 22 is reinforced by the reinforcing portion 34 including the main body portion 42, the first protruding portions 36B and 38B, and the second protruding portions 36C and 38C. Specifically, the main body portion 42 is provided inside the rocker 22, and the first protruding portions 36B and 38B, and the second protruding portions 36C and 38C protrude from the main body portion 42 in the vehicle vertical direction and are joined to the wall surface of the rocker 22 located on the protruding direction side of the first protruding portions 36B and 38B, and the second protruding portions 36C and 38C.

[0068] Therefore, when a load in the vehicle vertical direction is input to the rocker 22 during the running of the vehicle 10 and the cross-section of the rocker 22 attempts to deform so as to expand and contract in the vehicle vertical direction, the first protruding portions 36B and 38B, the second protruding portions 36C and 38C, and the main body portion 42 serve as a resistance to the deformation of the rocker 22. As a result, it becomes difficult for the rocker 22 to deform due to the load. That is, in the present embodiment, the reinforcing portion 34 can improve the rigidity of the rocker 22 with respect to the load in the vehicle vertical direction.

[0069] Further, in the present embodiment, the inside of the main body portion 42 is partitioned in the vehicle width direction and functions as a shock absorbing portion, and a plurality of space portions are formed in the main body portion 42 in the vehicle width direction. Therefore, when a collision load in the vehicle width direction is input, the peripheral portion of the space portion in the main body portion 42 can be crushed to absorb shock energy.

[0070] In addition, in the present embodiment, the first protruding portions 36B and 38B protrude from the main body portion 42 upward of the vehicle and are joined to the upper portion of the rocker 22 on the vehicle side, and the second protruding portions 36C and 38C protrude from the main body portion 42 downward of the vehicle and are joined to the lower portion of the rocker 22 on the vehicle side. Therefore, the rigidity of the rocker 22 against loads in the vehicle vertical direction can be further improved.

[0071] In addition, in the present embodiment, the first protruding portions 36B and the second protruding portions 36C are arranged in pairs in the vehicle vertical direction, and the first protruding portions 38B and the second protruding portions 38C are arranged in pairs in the vehicle vertical direction. And these pairs are arranged on the same side in the vehicle width direction with respect to the center of the rocker 22 in the vehicle width direction.

[0072] Therefore, the load received by the first protruding portion 36B from the upper portion of the rocker 22 on the vehicle side can be supported by the second protruding portion 36C, and the load received by the second protruding portion 36C from the lower portion of the rocker 22 on the vehicle side can be supported by the first protruding portion 36B. Also, the load received by the first protruding portion 38B from the upper portion of the rocker 22 on the vehicle side can be supported by the second protruding portion 38C, and the load received by the second protruding portion 38C from the lower portion of the rocker 22 on the vehicle side can be supported by the first protruding portion 38B

[0073] As a result, for example, compared with a configuration in which the protruding portions are not arranged in pairs in the vehicle vertical direction, the rigidity of the rocker 22 against loads in the vehicle vertical direction can be improved.

[0074] In addition, in the present embodiment, the main body portion 42 is joined to the outer portion and the inner portion of the rocker 22 in the vehicle width direction, and the expansion and contraction of the rocker 22 in the vehicle width direction are restricted by the main body portion 42. Therefore, the rigidity of the rocker 22 against loads in the vehicle vertical direction can be further improved.

[0075] In addition, in the present embodiment, the reinforcing portion 34 includes a shared panel 40 provided in the rocker 22. This shared panel 40 extends in the vehicle up-and-down direction, and the upper part and the lower part of the rocker 22 in the vehicle are connected by this shared panel 40. Therefore, the expansion and contraction of the rocker 22 in the vehicle up-and-down direction is restricted by the shared panel 40, and as a result, the rigidity of the rocker 22 against the load in the vehicle up-and-down direction can be further improved.

[0076] In addition, in the present embodiment, the first protruding portion 36B and the first protruding portion 38B are integrally formed with the upper part of the main body portion 42 in the vehicle, and the second protruding portion 36C and the second protruding portion 38C are integrally formed with the lower part of the main body portion 42 in the vehicle. Therefore, the number of components constituting the vehicle 10 can be reduced, and the manufacturing process of the vehicle 10 can be simplified.

[0077] In addition, in the present embodiment, by bending a plate material, the base portion 36A, the first protruding portion 36B, and the second protruding portion 36C that constitute a part of the main body portion 42 can be integrally formed. Similarly, by bending a plate material, the base portion 38A, the first protruding portion 38B, and the second protruding portion 38C that constitute a part of the main body portion 42 can be integrally formed. As a result, the manufacturing process of the vehicle 10 can be further simplified.

[0078] In addition, in the present embodiment, the upper surface 36B1 joined to the rocker 22 in the first protruding portion 36B and the portion joined to the upper surface 36B1 in the rocker 22 are in a parallel state when viewed from the vehicle front-rear direction, and the first protruding portion 36B and the rocker 22 can be brought into surface contact. The same applies to the lower surface 36C1 of the second protruding portion 36C, the upper surface 38B1 of the first protruding portion 38B, and the lower surface 38C1 of the second protruding portion 38C.

[0079] Therefore, when a load in the vehicle up-and-down direction is input, it is possible to suppress the occurrence of stress concentration portions at the contact portions between the rocker 22 and the first protruding portion 36B, the second protruding portion 36C, the first protruding portion 38B, and the second protruding portion 38C, and further improve the rigidity of the rocker 22 against the load in the vehicle up-and-down direction.

[0080] Thus, in this embodiment, while improving the ride comfort of the vehicle 10, it is possible to absorb the collision load in the vehicle width direction.

[0081] <Second Embodiment> Hereinafter, with reference to FIG. 3, a second embodiment of the vehicle lower structure according to the present invention will be described. The same components as those in the above-described first embodiment are denoted by the same reference numerals and their description will be omitted.

[0082] In the vehicle lower structure according to this embodiment, the "reinforcing portion 50" provided in the rocker 22 is an extruded product of an aluminum alloy.

[0083] Specifically, the reinforcing portion 50 includes a "main body portion 50A" that constitutes its main part, a "first protruding portion 50B", a "second protruding portion 50C", a "first protruding portion 50D", and a "second protruding portion 50E" as protruding portions.

[0084] The main body portion 50A has a rectangular parallelepiped shape extending in the vehicle front-rear direction, and includes an upper wall portion 50A1 that constitutes the upper portion of the vehicle, a side wall portion 50A2 that constitutes the outer portion in the vehicle width direction, a side wall portion 50A3 that constitutes the inner portion in the vehicle width direction, and a lower wall portion 50A4 that constitutes the lower portion of the vehicle.

[0085] Further, the upper wall portion 50A1 and the lower wall portion 50A4 are in the vehicle width direction as the thickness direction and are connected by a plurality of partition wall portions 50A5 arranged in the vehicle width direction, so that the inside of the main body portion 50A is partitioned in the vehicle width direction. That is, a plurality of space portions extending in the vehicle front-rear direction are formed in the main body portion 50A. And these space portions serve as the crush allowance of the main body portion 50A when the collision load in the vehicle width direction is input, and the main body portion 50A functions as a shock absorption portion.

[0086] Note that the side wall portion 50A2 is joined to the side wall portion 26B of the rocker outer panel 26, and the side wall portion 50A3 is joined to the side wall portion 28B of the rocker inner panel 28 by a joint portion (not shown) such as friction stir welding.

[0087] The first protruding portion 50B is formed at a portion on the outer side in the vehicle width direction of the upper wall portion 50A1 and extends in the vehicle longitudinal direction. It has a U-shape that protrudes upward from the upper wall portion 50A1 when viewed from the vehicle longitudinal direction and has an open lower side.

[0088] Also, the "upper surface 50B1" of the first protruding portion 50B is the joint surface with the upper wall portion 26A of the rocker outer panel 26, and is in a state parallel to the upper wall portion 26A when viewed from the vehicle longitudinal direction. The upper surface 50B1 of the first protruding portion 50B and the upper wall portion 26A of the rocker outer panel 26 are joined by a joint portion (not shown) such as friction stir welding.

[0089] The second protruding portion 50C is formed at a portion on the outer side in the vehicle width direction of the lower wall portion 50A4 and extends in the vehicle longitudinal direction. It has a U-shape that protrudes downward from the lower wall portion 50A4 when viewed from the vehicle longitudinal direction and has an open upper side.

[0090] Also, the "lower surface 50C1" of the second protruding portion 50C is the joint surface with the lower wall portion 26C of the rocker outer panel 26, and is in a state parallel to the lower wall portion 26C when viewed from the vehicle longitudinal direction. The lower surface 36C1 of the second protruding portion 36C and the wall surface of the lower wall portion 26C of the rocker outer panel 26 are joined by a joint portion (not shown) such as friction stir welding.

[0091] Note that the first protruding portion 50B and the second protruding portion 50C are arranged in a set so as to overlap when viewed from the vehicle vertical direction, and they are located on the outer side in the vehicle width direction with respect to the centroid G when viewed from the vehicle longitudinal direction.

[0092] The first protruding portion 50D is formed in a portion on the inner side in the vehicle width direction of the upper wall portion 50A1 and extends in the vehicle longitudinal direction. When viewed from the vehicle longitudinal direction, it protrudes upward from the upper wall portion 50A1 and has a U-shaped configuration with the lower side of the vehicle being open.

[0093] Further, the "upper surface 50D1" of the first protruding portion 50D is a joint surface with the upper wall portion 28A of the rocker inner panel 28 and is in a state parallel to the upper wall portion 28A when viewed from the vehicle longitudinal direction. The upper surface 50D1 of the first protruding portion 50D and the upper wall portion 28A of the rocker inner panel 28 are joined by a joint portion (not shown) such as friction stir welding.

[0094] The second protruding portion 50E is formed in a portion on the inner side in the vehicle width direction of the lower wall portion 50A4 and extends in the vehicle longitudinal direction. When viewed from the vehicle longitudinal direction, it protrudes downward from the lower wall portion 50A4 and has a U-shaped configuration with the upper side of the vehicle being open.

[0095] Further, the "lower surface 50E1" of the second protruding portion 50E is a joint surface with the lower wall portion 28C of the rocker inner panel 28 and is in a state parallel to the lower wall portion 28C when viewed from the vehicle longitudinal direction. The lower surface 50E1 of the second protruding portion 50E and the lower wall portion 28C of the rocker inner panel 28 are joined by a joint portion (not shown) such as friction stir welding.

[0096] Further, the first protruding portion 50D and the second protruding portion 50E are arranged in a set so as to overlap when viewed from the vehicle vertical direction, and they are located on the inner side in the vehicle width direction with respect to the centroid G when viewed from the vehicle longitudinal direction.

[0097] According to such a configuration, except for the fact that the reinforcing portion 34 is composed of a press-processed member and the action and effect by the shared panel 40, basically the same actions and effects as those of the first embodiment described above can be achieved. Further, in the present embodiment, since the reinforcing portion 50 can be configured by one part, the number of parts of the parts constituting the vehicle 10 can be reduced.

[0098] <Third Embodiment> Hereinafter, a third embodiment of the vehicle lower structure according to the present invention will be described with reference to FIG. 4. Note that the same components as those in the above-described first embodiment are denoted by the same reference numerals and their description will be omitted.

[0099] In the vehicle lower structure according to the present embodiment, the "reinforcing portion 60" includes a steel outer reinforcing member 62, a steel inner reinforcing member 64, a steel "shared panel 66", a "first protruding portion 68" as an extruded product of an aluminum alloy and serving as a protruding portion, a "second protruding portion 70", a "first protruding portion 72", and a "second protruding portion 74". is configured to include.

[0100] The outer reinforcing member 62 is formed by pressing a single steel plate and extends in the vehicle front-rear direction. The outer reinforcing member 62 includes an upper wall portion 62A that constitutes the upper portion of the vehicle, a side wall portion 62B that constitutes the outer portion in the vehicle width direction, a lower wall portion 62C that constitutes the lower portion of the vehicle, and a pair of flange portions 62D. That is, the outer reinforcing member 62 has a hat-shaped cross-sectional shape when viewed from the vehicle front-rear direction with the inner side in the vehicle width direction open. And the side wall portion 62B is joined to the side wall portion 26B of the rocker outer panel 26 by a joining portion (not shown) such as welding.

[0101] On the other hand, the inner reinforcing member 64 is formed by pressing a single steel plate and extends in the vehicle front-rear direction. The inner reinforcing member 64 includes an upper wall portion 64A that constitutes the upper portion of the vehicle, a side wall portion 64B that constitutes the inner portion in the vehicle width direction, a lower wall portion 64C that constitutes the lower portion of the vehicle, and a pair of flange portions 64D. That is, the inner reinforcing member 64 has a hat-shaped cross-sectional shape when viewed from the vehicle front-rear direction with the outer side in the vehicle width direction open. And the side wall portion 64B is joined to the side wall portion 28B of the rocker inner panel 28 by a joining portion (not shown) such as welding.

[0102] The shared panel 66 has the same configuration as the shared panel 40, and its upper end portion 66A is joined to the rocker outer panel 26 and the rocker inner panel 28 by a joint (not shown) such as welding while being sandwiched between them.

[0103] Also, the portion immediately below the upper end portion 66A of the shared panel 66 is joined to the upper vehicle-side flange portion 62D of the outer reinforcing member 62 and the upper vehicle-side flange portion 64D of the inner reinforcing member 64 by a joint (not shown) such as welding while being sandwiched between them.

[0104] On the other hand, the lower end portion 66B of the shared panel 66 is joined to the rocker outer panel 26 and the rocker inner panel 28 by a joint (not shown) such as welding while being sandwiched between them, similar to the shared panel 40.

[0105] Also, the portion immediately above the lower end portion 66B of the shared panel 66 is joined to the lower vehicle-side flange portion 62D of the outer reinforcing member 62 and the lower vehicle-side flange portion 64D of the inner reinforcing member 64 by a joint (not shown) such as welding while being sandwiched between them.

[0106] Also, hereinafter, the assembly of the outer reinforcing member 62, the inner reinforcing member 64, and the shared panel 66 will be referred to as the "main body portion 76". The interior of this main body portion 76 is partitioned in the vehicle width direction, thereby forming a plurality of space portions extending in the vehicle front-rear direction. And these space portions serve as the crush allowance of the outer reinforcing member 62 and the inner reinforcing member 64 when a collision load is input in the vehicle width direction, and the main body portion 76 functions as a shock absorption portion.

[0107] The first protruding portion 68 is formed in a rectangular tube shape extending in the vehicle front-rear direction, is disposed at the center in the vehicle width direction of the upper wall portion 62A, and its lower surface 68A is joined to the upper wall portion 62A by a joint (not shown) such as friction stir welding.

[0108] Further, the "upper surface 68B" of the first protrusion 68 serves as a joint surface with the upper wall portion 26A of the rocker outer panel 26, and is in a state parallel to the upper wall portion 26A when viewed in the vehicle longitudinal direction. The upper surface 68B of the first protrusion 68 and the wall surface of the upper wall portion 26A of the rocker outer panel 26 are joined by a joint portion (not shown) such as friction stir welding.

[0109] The second protrusion 70 is formed in a rectangular tube shape extending in the vehicle longitudinal direction, is disposed at the center in the vehicle width direction of the lower wall portion 62C, and its upper surface 70A is joined to the lower wall portion 62C by a joint portion (not shown) such as friction stir welding.

[0110] Also, the "lower surface 70B" of the second protrusion 70 serves as a joint surface with the lower wall portion 26C of the rocker outer panel 26, and is in a state parallel to the lower wall portion 26C when viewed in the vehicle longitudinal direction. The lower surface 70B of the second protrusion 70 and the wall surface of the lower wall portion 26C of the rocker outer panel 26 are joined by a joint portion (not shown) such as friction stir welding.

[0111] Note that the first protrusion 68 and the second protrusion 70 are arranged in a set so as to overlap when viewed in the vehicle vertical direction, and they are located outside the vehicle width direction with respect to the centroid G when viewed in the vehicle longitudinal direction.

[0112] The first protrusion 72 is formed in a rectangular tube shape extending in the vehicle longitudinal direction, is disposed at the center in the vehicle width direction of the upper wall portion 64A, and its lower surface 72A is joined to the upper wall portion 64A by a joint portion (not shown) such as friction stir welding.

[0113] Also, the "upper surface 72B" of the first protrusion 72 serves as a joint surface with the upper wall portion 28A of the rocker inner panel 28, and is in a state parallel to the upper wall portion 28A when viewed in the vehicle longitudinal direction. The upper surface 72B of the first protrusion 72 and the wall surface of the upper wall portion 28A of the rocker inner panel 28 are joined by a joint portion (not shown) such as friction stir welding.

[0114] The second protruding portion 74 is formed in a rectangular tube shape extending in the vehicle front-rear direction, and is disposed at the center in the vehicle width direction of the lower wall portion 64C. The upper surface 74A thereof is joined to the lower wall portion 62C by a joining portion (not shown) such as friction stir welding.

[0115] Further, the "lower surface 74B" of the second protruding portion 74 serves as a joint surface with the lower wall portion 28C of the rocker inner panel 28, and is in a state parallel to the lower wall portion 28C when viewed from the vehicle front-rear direction. The lower surface 74B of the second protruding portion 74 and the wall surface of the lower wall portion 28C of the rocker inner panel 28 are joined by a joining portion (not shown) such as friction stir welding.

[0116] Note that the first protruding portion 72 and the second protruding portion 74 are arranged in a set so as to overlap when viewed from the vehicle vertical direction, and they are located inside the vehicle width direction with respect to the centroid G when viewed from the vehicle front-rear direction.

[0117] According to such a configuration, except for the actions and effects due to the plurality of protruding portions being part of a press-processed member, basically the same actions and effects as those of the first embodiment described above can be achieved.

[0118] Also, in the present embodiment, by making the outer reinforcing member 62, the inner reinforcing member 64, the first protruding portion 68, the second protruding portion 70, the first protruding portion 72, and the second protruding portion 74 into separate parts, the shapes of the parts constituting the reinforcing portion 60 can be simplified.

[0119] <Supplementary Explanation of the Above Embodiment> (1) In the first embodiment described above, a plurality of protruding portions were provided on each of the outer reinforcing member 36 and the inner reinforcing member 38. However, depending on the specifications of the vehicle 10 and the like, a configuration may be adopted in which one protruding portion is provided on each of the outer reinforcing member 36 and the inner reinforcing member 38.

[0120] (2) Also, in the above-described first embodiment, the reinforcing portion 34 includes the outer reinforcing member 36 and the inner reinforcing member 38. However, depending on the specifications of the vehicle 10 and the like, a configuration may be adopted in which the reinforcing portion 34 includes only one of the outer reinforcing member 36 and the inner reinforcing member 38.

[0121] (3) Further, in the above-described second embodiment, the inside of the reinforcing portion 50 was partitioned. However, depending on the specifications of the vehicle 10 and the like, a configuration may be adopted in which the reinforcing portion 50 is formed in a shape having only its outer peripheral portion.

Explanation of Reference Numerals

[0122] 10 Vehicle 10A Vehicle side portion 22 Rocker 34 Reinforcing portion 36B First protrusion (protrusion) 36B1 Upper surface (joint surface) 36C Second protrusion (protrusion) 36C1 Lower surface (joint surface) 38B First protrusion (protrusion) 38B1 Upper surface (joint surface) 38C Second protrusion (protrusion) 38C1 Lower surface (joint surface) 40 Shared panel 42 Main body portion 50 Reinforcing portion 50A Main body portion 50B First protrusion (protrusion) 50B1 Upper surface (joint surface) 50C Second protrusion (protrusion) 50C1 Lower surface (joint surface) 50D First protrusion (protrusion) 50D1 Upper surface (joint surface) 50E Second protrusion (protrusion) 50E1 Lower surface (joint surface) 60 Reinforcing portion 66 Shared panel 68 First protrusion (protrusion) 68B Upper surface (joint surface) 70 Second protrusion (protrusion) 70B Lower surface (joint surface) 72 First protrusion (protrusion) 72B Upper surface (joint surface) 74 Second protrusion (protrusion) 74B Lower surface (joint surface) 76 Body part

Claims

1. A rocker that forms a part of the lower side of the vehicle on the side of the vehicle and is arranged along the longitudinal direction of the vehicle, and a reinforcing part including a main body portion provided in the rocker and a protruding portion that protrudes in the vertical direction of the vehicle from the main body portion and is joined to a wall surface of the rocker located on the protruding direction side. A vehicle lower structure having the above.

2. The main body portion is an impact absorbing portion whose interior is partitioned in the vehicle width direction, a first protruding portion as the protruding portion protrudes upward from the impact absorbing portion and is joined to an upper portion of the rocker on the vehicle side, a second protruding portion as the protruding portion protrudes downward from the impact absorbing portion and is joined to a lower portion of the rocker on the vehicle side. The vehicle lower structure according to Claim 1.

3. The first protruding portion and the second protruding portion are arranged in a set in the vertical direction of the vehicle, the first protruding portion and the second protruding portion that are set are arranged on the same side in the vehicle width direction with respect to the center of the rocker in the vehicle width direction. The vehicle lower structure according to Claim 2.

4. The main body portion is joined to an outer portion and an inner portion of the rocker in the vehicle width direction. The vehicle lower structure according to Claim 1.

5. The reinforcing part further includes a shared panel that is provided in the rocker, extends in both the vertical directions, and connects an upper portion and a lower portion of the rocker on the vehicle side. The vehicle lower structure according to Claim 1.

6. The protruding portion is integrally formed with at least one of an upper portion and a lower portion of the main body portion on the vehicle side. The vehicle lower structure according to Claim 1.

7. A portion of the main body portion where the protruding portion is provided and the protruding portion are made of the same plate material. The vehicle lower structure according to Claim 6.

8. A joint surface of the protruding portion joined to the rocker and a portion of the rocker joined to the joint surface are in a parallel state when viewed from the longitudinal direction of the vehicle. The vehicle lower structure according to Claim 1.

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