Frame structure for vehicle

Abstract

The invention provides a frame structure for a vehicle, which can efficiently absorb collision energy and contribute to sustainable development of a transportation system. A first portion (10) of a side frame (3), which is a frame structure for a vehicle, comprises: a pair of opposing wall sections (11, 11) extending in the front-rear direction of the vehicle body; a connecting wall section (12) that extends in the front-rear direction of the vehicle body and connects the pair of opposing wall sections (11, 11); a plurality of straight ribs (12b) and V-shaped ribs (12c) as erection ribs formed so as to connect the pair of opposing wall sections (11, 11) and the connecting wall section (12); and a fragile section (11a) formed on the facing wall section (11) and / or the connecting wall section (12), the fragile section (11a) being formed so as to be located between two adjacent erection ribs in the front-rear direction of the vehicle body.

Description

Technical Field

[0001] The present invention relates to a frame structure for a vehicle. Background Art

[0002] In recent years, from the viewpoints of suppressing natural disasters and improving the global environment, improvement in the fuel consumption rate of automobiles has been demanded. On the other hand, maintaining or improving the collision safety of vehicles has been demanded. In order to meet these demands, development of a vehicle frame structure for absorbing collision energy has been carried out. As such a vehicle frame structure, a front body (engine room) composed of a single casting member having a plurality of ribs is disclosed in Patent Document 1.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Chinese Patent No. 115158479 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] This structure can be set to have high rigidity, but due to the high rigidity, it is difficult to deform and crush, and there is room for improvement in terms of collision energy absorption. In addition, in this structure, even when deformation occurs, crushing may occur and collision energy may not be sufficiently absorbed.

[0008] The present invention has been made in view of the above problems, and the problem is to provide a vehicle frame structure that can efficiently absorb collision energy and further contribute to the development of a sustainable transportation system.

[0009] Means for Solving the Problems

[0010] In order to solve the above-mentioned problems, the vehicle frame structure of the present invention is characterized by including: a pair of opposed wall portions that extend in the vehicle front-rear direction; a connecting wall portion that extends in the vehicle front-rear direction and connects the pair of opposed wall portions; a plurality of bridging ribs that are formed on the connecting wall portion so as to connect the pair of opposed wall portions; and a vulnerable portion that is formed on the opposed wall portion and / or the connecting wall portion, and the vulnerable portion is formed to be located between two adjacent bridging ribs in the vehicle front-rear direction.

[0011] Advantages of the Invention

[0012] According to the present invention, collision energy can be efficiently absorbed, and further, the development of a sustainable transportation system can be contributed to. Brief Description of the Drawings

[0013] Figure 1 It is a side view schematically showing a body structure of a vehicle frame structure to which an embodiment of the present invention is applied.

[0014] Figure 2 is a bottom view schematically showing a vehicle frame structure according to an embodiment of the present invention.

[0015] Figure 3 is a side view schematically showing a vehicle frame structure according to an embodiment of the present invention.

[0016] Figure 4 is a bottom view schematically showing a first part and a second part in a vehicle frame structure according to an embodiment of the present invention.

[0017] Figure 5 is Figure 4 a sectional view taken along line V-V of

[0018] Description of Reference Numerals

[0019] 1 Body structure

[0020] 2 Front member (vehicle frame structure, body structure member applying the vehicle frame structure)

[0021] 3 Side frame (front side frame of the frame, vehicle frame structure)

[0022] 4 Upper member

[0023] 5 Connecting part

[0024] 6 Wheel housing

[0025] 7 Shock absorber housing

[0026] 10 First part

[0027] 11 Opposing wall part

[0028] 11a Weak part (reinforcing rib)

[0029] 12 Connecting wall part

[0030] 12a Parallel rib

[0031] 12b Straight rib (erecting rib)

[0032] 12c V-shaped rib (erecting rib)

[0033] 12d Crossing part Detailed Description of the Invention

[0034] Next, taking the case where the vehicle frame structure of the present invention is applied to the front side frame as an example, embodiments of the present invention will be described in detail with reference to appropriate drawings. In the drawings, "front and rear" represents the front and rear directions in the traveling direction of the vehicle, and "left and right" represents the left and right directions (vehicle width direction) as observed from the driver's seat. In addition, since the vehicle frame structure is applied to the front part of the vehicle body, the outer side (outer side) in the vehicle body front and rear direction becomes the front side (front side), and the inner side (inner side) in the vehicle body front and rear direction becomes the rear side (rear side) (the opposite is true when applied to the rear part of the vehicle body).

[0035] As Figure 1 shown, the vehicle body structure 1 of the embodiment of the present invention is composed of a die-cast casting, and at least a part of the die-cast casting is formed by a die-casting method using aluminum (aluminum die-casting method). The vehicle body structure 1 includes a pair of front members 2, 2 in the vehicle width direction disposed at the front part of the vehicle body.

[0036] <Front member>

[0037] The front member 2 is an example of a vehicle body structure member to which the vehicle frame structure of the present invention is applied, and is a member that constitutes the front part of the vehicle body structure 1. The front member 2 is a die-cast casting formed by an aluminum die-casting method (integrally formed), and integrally includes a side frame 3, an upper member 4, a connecting portion 5, a wheel housing 6, and a shock absorber housing 7.

[0038] <Side frame (front side frame)>

[0039] The side frame 3 is an example of the vehicle frame structure of the present invention, and is a frame having an open cross-sectional shape that extends in the front-rear direction along the vehicle width direction end side at the lower part of the vehicle body. The side frame 3 will be described in detail later.

[0040] <Upper member>

[0041] The upper member 4 is a frame having an open cross-sectional shape that extends in the front-rear direction on the outer side in the vehicle width direction relative to the side frame 3. The upper member 4 has a shape similar to the upper end portions of the wheel housing 6 and the shock absorber housing 7, and is formed so as to face upward as it extends rearward.

[0042] <Connecting portion>

[0043] The connecting portion 5 is a frame having an open cross-sectional shape that extends in the vehicle width direction, and is a portion that connects a position slightly behind the front end portion of the side frame 3 to the front end portion of the upper member 4. The inner end portion in the vehicle width direction of the connecting portion 5 is connected to the outer end portion in the vehicle width direction of the side frame 3 that is slightly behind the front end portion. The rear end portion of the outer end portion in the vehicle width direction of the connecting portion 5 is connected to the front end portion of the upper member 4. The rear end portion of the connecting portion 5 is connected to the front end portion of the wheel housing 6.

[0044] <Wheel housing>

[0045] The wheel housing 6 is a part that houses the wheel (the front wheel in this embodiment) in a space formed outside the wheel housing 6 in the vehicle width direction. The front end portion of the wheel housing 6 is connected to the rear end portion of the connecting portion 5. The lower end portion of the inner end portion of the wheel housing 6 in the vehicle width direction is connected to the upper end portion of the outer end portion of the side frame 3 in the vehicle width direction. The upper end portion of the outer end portion of the wheel housing 6 in the vehicle width direction is connected to the lower end portion of the inner end portion of the upper member 4 in the vehicle width direction.

[0046] <Shock absorber housing>

[0047] The shock absorber housing 7 is provided above the wheel housing 6 and is a part that houses the shock absorber, on which the wheel (front wheel) is suspended.

[0048] <Side frame (front side frame)>

[0049] As Figure 2 and Figure 3 shown, the side frame 3 integrally includes a first portion 10, a second portion 20, a third portion 30, a fourth portion 40, and a fifth portion 50 in order from the front to the rear.

[0050] <Side frame: First portion>

[0051] The first portion 10 forms the front part of the side frame 3 and is a part that protrudes forward (outward in the vehicle longitudinal direction. When the side frame is applied to the rear part of the vehicle body, it is backward) compared to the connecting portion 5. As Figure 4 shown, the first portion 10 integrally includes a flat plate portion 13, a pair of opposing wall portions 11, 11, and a connecting wall portion 12 that connects the opposing wall portions 11, 11. It should be noted that Figure 4 shows the first portion 10 and the second portion 20 of the side frame 3 applied to the right side of the vehicle.

[0052] 《Opposing wall portion》

[0053] The opposing wall portions 11, 11 are long plate-shaped parts that extend in the front-rear direction and oppose each other separately. In this embodiment, the opposing wall portions 11, 11 extend in the front-rear direction and the up-down direction and oppose each other separately in the vehicle width direction. That is, one of the opposing wall portions 11, 11 is an inner wall portion arranged on the inner side in the vehicle width direction, and the other of the opposing wall portions 11, 11 is an outer wall portion arranged on the outer side in the vehicle width direction.

[0054] The interval between the pair of opposing wall portions 11, 11 widens as it goes toward the rear. In this embodiment, the opposing wall portion 11 serving as the inner wall portion is parallel to the vehicle longitudinal direction of the vehicle body. In addition, the opposing wall portion 11 serving as the outer wall portion is inclined so as to face outward in the vehicle width direction as it goes toward the rear and is inclined at an inclination angle θ within a range greater than 0° and equal to or less than 5° with respect to the vehicle longitudinal direction of the vehicle body.

[0055] 《Weak Part》

[0056] A plurality of weak parts 11a are respectively formed on the opposed wall parts 11, 11. The weak part 11a is weaker than other parts of the opposed wall part 11. More specifically, it is formed to be easily deformed (crushed) in a crushing manner under a load in the front - rear direction. In the present embodiment, the weak part 11a is a rib (recessed part) that is recessed inward or outward of the pair of opposed wall parts 11, 11. The plurality of weak parts 11a are arranged in the front - rear direction (the length direction of the opposed wall part 11). In the present embodiment, the weak part 11a formed on the opposed wall part 11 serving as the inner wall part is recessed outward in the vehicle width direction, and the weak part 11a formed on the opposed wall part 11 serving as the outer wall part is recessed inward in the vehicle width direction. The weak part 11a of the inner wall part and the weak part 11a of the outer wall part are arranged such that they are located at the same position in the front - rear direction, in other words, arranged in the vehicle width direction.

[0057] It should be noted that the direction of the recess of the rib (recessed part) serving as the weak part 11a can be appropriately set. In the present embodiment, among the weak parts 11a formed on the opposed wall part 11 serving as the inner wall part, the foremost weak part 11a is recessed inward in the vehicle width direction. According to this configuration, the bending direction of the front end part of the first part 10 can be controlled to the inner side in the vehicle width direction, and the crushing and buckling of the first part 10 can be appropriately achieved.

[0058] 《Connecting Wall Part》

[0059] The connecting wall part 12 is formed in a manner to connect the pair of opposed wall parts 11, 11. In the present embodiment, the connecting wall part 12 extends in the front - rear direction and the vehicle width direction, and is an upper wall part that connects the upper end parts of the pair of opposed wall parts 11, 11 to each other.

[0060] An intersection part 12d, parallel ribs 12a parallel to the opposed wall parts 11, 11, and a plurality of straight ribs 12b and V - shaped ribs 12c serving as bridging ribs and bridging the opposed wall parts 11, 11 are formed on the connecting wall part 12.

[0061] 《Parallel Ribs》

[0062] The parallel ribs 12a are provided to extend downward from the middle part in the vehicle width direction of the connecting wall part 12. The parallel ribs 12a extend in the front - rear direction and are formed in a manner parallel to the pair of opposed wall parts 11, 11. The parallel ribs 12a intersect with the plurality of bridging ribs.

[0063] 《Straight Ribs》

[0064] The straight rib 12b extends downward from the connecting wall portion 12. The straight rib 12b extends linearly in the direction intersecting with the pair of opposing wall portions 11, 11 (in the present embodiment, the direction orthogonal to the pair of opposing wall portions 11, 11, i.e., the vehicle width direction). Both end portions of the straight rib 12b are connected to the opposing wall portion 11 respectively, and the middle portion of the straight rib 12b intersects with the parallel rib 12a.

[0065] 《V-shaped Rib》

[0066] The V-shaped rib 12c extends downward from the connecting wall portion 12. The V-shaped rib 12c has a V shape and is inclined in such a way that it faces inward (in the present embodiment, rearward) in the vehicle longitudinal direction as it approaches from the opposing wall portions 11, 11 (the end portions of the V-shaped rib 12c) to the parallel rib 12a (the middle portion of the V-shaped rib 12c). That is, both end portions of the V-shaped rib 12c are connected to the opposing wall portion 11 respectively, and the middle portion (V-shaped vertex) of the V-shaped rib 12c intersects with the parallel rib 12a.

[0067] 《Crossing Portion》

[0068] The crossing portion 12d is the portion where the parallel rib 12a intersects with the bridging rib (the straight rib 12b and / or the V-shaped rib 12c). The crossing portion 12d also functions as the portion extruded from the die casting mold by the ejector pin when formed by die casting. The dimension in the thickness direction of the crossing portion 12d is larger than the dimension in the thickness direction of the parallel rib 12a and the bridging rib (the straight rib 12b and / or the V-shaped rib 12c). In the present embodiment, the crossing portion 12d has a cylindrical shape, and the diameter of the crossing portion 12d is larger than the dimension in the thickness direction of the parallel rib 12a and the bridging rib (the straight rib 12b and / or the V-shaped rib 12c).

[0069] A set of bridging ribs (the straight rib 12b and / or the V-shaped rib 12c) and the crossing portion 12d are arranged between two fragile portions 11a arranged in the front-rear direction. In other words, the fragile portion 11a is arranged between two sets of bridging ribs (the straight rib 12b and / or the V-shaped rib 12c) and the crossing portion 12d arranged in the front-rear direction. Both end portions of the V-shaped rib 12c are connected to the rear end portion of the fragile portion 11a or a portion behind the fragile portion 11a on the opposing wall portion 11.

[0070] The foremost V-shaped rib 12c is connected to the foremost crossing portion 12d. The end portion of the foremost V-shaped rib 12c is connected to the front end portion of the opposing wall portion 11 (the boundary portion between the opposing wall portion 11 and the flat plate portion 13).

[0071] The second V-shaped rib 12c from the front and the foremost straight rib 12b are connected to the second crossing portion 12d from the front.

[0072] The third V-shaped rib 12c from the front and the second straight rib 12b from the front are connected to the third crossing portion 12d from the front.

[0073] As shown Figure 5 in the figure, the standing height of the parallel ribs 12a and the erected ribs (the straight rib 12b and the V-shaped rib 12c) (the dimension from the connecting wall portion 12 to the front end portion of each rib) is smaller than the width direction dimension of the opposing wall portion 11 (the up-and-down direction dimension in the present embodiment). In addition, the standing height of the crossing portion 12d (the dimension from the connecting wall portion 12 to the front end portion of the crossing portion 12d) is larger than the standing height of the parallel ribs 12a and the erected ribs (the straight rib 12b and the V-shaped rib 12c), and smaller than the width direction dimension of the opposing wall portion 11.

[0074] 《Flat portion》

[0075] As shown Figure 4 in the figure, the flat portion 13 is a wall portion (front wall portion) erected at one end portion in the longitudinal direction (the front end portion in the present embodiment) of a pair of opposing wall portions 11, 11 and the connecting wall portion 12. The flat portion 13 is a portion directly or via other components mounted on a vehicle bumper (bumper beam).

[0076] <Side frame: Second portion>

[0077] The second portion 20 is a portion connected to the inner end portion in the vehicle width direction of the connecting portion 5. The second portion 20 integrally includes a pair of opposing wall portions 21, 21, a connecting wall portion 22, and a flat portion 23.

[0078] 《Opposing wall portion》

[0079] The opposing wall portions 21, 21 are long plate-like portions extending in the front-rear direction and are opposed to each other separately. In the present embodiment, the opposing wall portions 21, 21 extend in the front-rear direction and the up-and-down direction and are opposed to each other separately in the vehicle width direction. The front end portions of the opposing wall portions 21, 21 are respectively connected to the rear end portions of the opposing wall portions 11, 11. One of the opposing wall portions 21, 21 is an inner wall portion disposed on the inner side in the vehicle width direction, and the other of the opposing wall portions 21, 21 is an outer wall portion disposed on the outer side in the vehicle width direction.

[0080] 《Fragile portion》

[0081] One or more vulnerable portions 21a are formed in the opposed wall portions 21. The vulnerable portion 21a is more vulnerable than other portions of the opposed wall portion 21. More specifically, it is formed to be easily deformed (crushed) in a crushing manner against a load in the front-rear direction. In the present embodiment, the vulnerable portion 21a is a reinforcing rib (recessed portion) that is recessed inwardly of the pair of opposed wall portions 21, 21. When there are a plurality of vulnerable portions 21a, the plurality of vulnerable portions 21a are arranged in the front-rear direction (the longitudinal direction of the opposed wall portion 21). In the present embodiment, the vulnerable portion 21a formed on the opposed wall portion 21 serving as the inner wall portion is recessed outward in the vehicle width direction, and the vulnerable portion 21a formed on the opposed wall portion 21 serving as the outer wall portion is recessed inward in the vehicle width direction.

[0082] 《Connecting Wall Portion》

[0083] The connecting wall portion 22 is formed so as to connect the pair of opposed wall portions 21, 21. The front end portion of the connecting wall portion 22 is connected to the rear end portion of the connecting wall portion 12. In the present embodiment, the connecting wall portion 22 extends in the front-rear direction and the vehicle width direction, and is an upper wall portion that connects the upper end portions of the pair of opposed wall portions 21, 21 to each other.

[0084] Parallel ribs 22a are formed on the connecting wall portion 22 and are parallel to the opposed wall portions 21, 21.

[0085] 《Parallel Ribs》

[0086] The parallel ribs 22a extend downward from the intermediate portion in the vehicle width direction of the connecting wall portion 22. The parallel ribs 22a extend in the front-rear direction and are formed so as to be parallel to the pair of opposed wall portions 21, 21. The front end portion of the parallel rib 22a is connected to the rear end portion of the parallel rib 12a. The rear end portion of the parallel rib 22a is connected to the flat plate portion 23.

[0087] 《Flat Plate Portion》

[0088] The flat plate portion 23 is a wall portion (rear wall portion) that bridges one end portion (the rear end portion in the present embodiment) in the longitudinal direction of the pair of opposed wall portions 21, 21 and the connecting wall portion 22.

[0089] <Side Frame: Third Portion>

[0090] As Figure 3 shown, the third portion 30 is a portion that is connected to the lower end portion of the front portion of the wheel housing 6. The third portion 30 integrally includes a flat plate portion 33, a pair of opposed wall portions 31, 31, and a connecting wall portion 32 that connects the opposed wall portions 31, 31.

[0091] 《Opposed Wall Portion》

[0092] The opposing wall portions 31, 31 are long plate-shaped portions extending in the front-rear direction and oppose each other separately. In the present embodiment, the opposing wall portions 31, 31 extend in the front-rear direction and the vehicle width direction, and oppose each other separately in the up-down direction. That is, one of the opposing wall portions 31, 31 is an upper wall portion disposed on the upper side, and the other of the opposing wall portions 31, 31 is a lower wall portion disposed on the lower side. The front end portion of the opposing wall portion 31 serving as the upper wall portion is connected to the rear end portion of the connecting wall portion 22.

[0093] 《Connecting Wall Portion》

[0094] The connecting wall portion 32 is formed in such a way as to connect the pair of opposing wall portions 31, 31. In the present embodiment, the connecting wall portion 32 extends in the front-rear direction and the up-down direction, and is an inner wall portion that connects the inner ends in the vehicle width direction of the pair of opposing wall portions 31, 31. The front end portion of the connecting wall portion 32 is connected to the rear end portion of the opposing wall portion 21 serving as the inner wall portion. The upper end portion of the connecting wall portion 32 is connected to the lower end portion of the wheel housing 6.

[0095] A crossing portion 32d, parallel ribs 32a parallel to the opposing wall portions 31, 31, and a plurality of straight ribs 32b and V-shaped ribs 32c serving as bridging ribs bridging the opposing wall portions 31, 31 are formed on the connecting wall portion 32.

[0096] 《Parallel Ribs》

[0097] The parallel ribs 32a are provided to extend outward in the vehicle width direction from the middle portion in the up-down direction of the connecting wall portion 32. The parallel ribs 32a extend in the front-rear direction and are formed in a manner parallel to the pair of opposing wall portions 31, 31. The parallel ribs 32a cross the plurality of bridging ribs. The front end portion of the parallel rib 32a is connected to the flat plate portion 23 ( Figure 4 ) is connected. The rear end portion of the parallel rib 32a is connected to the flat plate portion 33.

[0098] 《Straight Ribs》

[0099] The straight ribs 32b are provided to extend outward in the vehicle width direction from the connecting wall portion 32. The straight ribs 32b extend linearly in the direction crossing the pair of opposing wall portions 31, 31 (in the present embodiment, the direction orthogonal to the pair of opposing wall portions 31, 31, i.e., the up-down direction). Both end portions of the straight rib 32b are respectively connected to the opposing wall portion 31, and the middle portion of the straight rib 32b crosses the parallel rib 32a.

[0100] 《V-shaped Ribs》

[0101] The V-shaped rib 32c extends outward in the vehicle width direction from the connecting wall portion 32. The V-shaped rib 32c has a V shape and is inclined in such a way that it slopes rearward from the opposing wall portions 31, 31 (the ends of the V-shaped rib 12c) toward the parallel rib 32a (the middle portion of the V-shaped rib 12c). That is, the two end portions of the V-shaped rib 32c are respectively connected to the opposing wall portions 31, and the middle portion (the V vertex) of the V-shaped rib 32c intersects the parallel rib 32a.

[0102] 《Intersection portion》

[0103] The intersection portion 32d is the portion where the parallel rib 32a intersects the bridging rib (the straight rib 32b and / or the V-shaped rib 32c). The intersection portion 32d also functions as the portion that is extruded from the die casting mold by the ejector pin when formed by die casting. The dimension in the thickness direction of the intersection portion 32d is larger than the dimension in the thickness direction of the parallel rib 32a and the bridging rib (the straight rib 32b and / or the V-shaped rib 32c). In the present embodiment, the intersection portion 32d has a cylindrical shape, and the diameter of the intersection portion 32d is larger than the dimension in the thickness direction of the parallel rib 32a and the bridging rib (the straight rib 32b and / or the V-shaped rib 32c).

[0104] 《Flat plate portion》

[0105] The flat plate portion 33 is a wall portion (rear wall portion) that is bridged over the end portions in the vehicle front-rear direction (the rear end portion in the present embodiment) of the pair of opposing wall portions 31, 31 and the connecting wall portion 32.

[0106] <Side frame: Fourth part>

[0107] The fourth part 40 is the portion connected to the lower end portion of the rear part of the wheel housing 6. The fourth part 40 integrally includes a pair of opposing wall portions 41, 41 and a connecting wall portion 42 that connects the opposing wall portions 41, 41.

[0108] 《Opposing wall portion》

[0109] The opposing wall portions 41, 41 are long plate-shaped portions extending in the front-rear direction and are opposed to each other separately. In the present embodiment, the opposing wall portions 41, 41 extend in the front-rear direction and the vehicle width direction and are opposed to each other separately in the up-down direction. That is, one of the opposing wall portions 41 is the upper wall portion arranged on the upper side, and the other of the opposing wall portions 41 is the lower wall portion arranged on the lower side. The front end portion of the opposing wall portion 41 serving as the upper wall portion is connected to the rear end portion of the opposing wall portion 31 serving as the upper wall portion. The front end portion of the opposing wall portion 41 serving as the lower wall portion is connected to the rear end portion of the opposing wall portion 31 serving as the lower wall portion.

[0110] 《Connecting wall portion》

[0111] The connecting wall portion 42 is formed in such a manner as to connect a pair of opposed wall portions 41, 41. In the present embodiment, the connecting wall portion 42 extends in the front-rear direction and the up-down direction, and is an inner wall portion that connects the in-vehicle-width-direction inner ends of the pair of opposed wall portions 41, 41 to each other. The front end portion of the connecting wall portion 42 is connected to the rear end portion of the opposed wall portion 31 that is an inner wall portion. The upper end portion of the connecting wall portion 42 is connected to the lower end portion of the wheel housing 6. The rear end portion of the connecting wall portion 42 is connected to the wheel housing 6.

[0112] A crossing portion 42d, a plurality of parallel ribs 42a parallel to the opposed wall portions 41, 41, and a plurality of straight ribs 42b serving as bridging ribs bridging the opposed wall portions 41, 41 are formed on the connecting wall portion 42.

[0113] 《Parallel Ribs》

[0114] The parallel ribs 42a extend outward in the vehicle width direction from the middle portion in the up-down direction of the connecting wall portion 32. The parallel ribs 42a extend in the front-rear direction and are formed in such a manner as to be parallel to the pair of opposed wall portions 41, 41. The front end portion of the parallel rib 42a is connected to the flat plate portion 33. The rear end portion of the parallel rib 42a is connected to the wheel housing 6.

[0115] 《Straight Ribs》

[0116] The straight ribs 42b extend outward in the vehicle width direction from the connecting wall portion 42. The straight ribs 42b extend linearly in the direction crossing the pair of opposed wall portions 41, 41 (in the present embodiment, the direction orthogonal to the pair of opposed wall portions 41, 41, i.e., the up-down direction). Both end portions of the straight rib 42b are respectively connected to the opposed wall portion 41, and the middle portion of the straight rib 42b crosses the parallel rib 42a.

[0117] 《Crossing Portion》

[0118] The crossing portion 42d is a portion where the parallel rib 42a crosses the bridging rib (straight rib 42b). The crossing portion 42d also functions as a portion extruded from the die casting mold by an ejector pin when formed by die casting. The dimension in the thickness direction of the crossing portion 42d is larger than the dimension in the thickness direction of the parallel rib 42a and the bridging rib (straight rib 32b). In the present embodiment, the crossing portion 42d has a cylindrical shape, and the diameter of the crossing portion 42d is larger than the dimension in the thickness direction of the parallel rib 42a and the bridging rib (straight rib 32b).

[0119] <Fifth Portion>

[0120] The fifth portion 50 is a portion connected to the lower end portion of the rear part of the wheel housing 6. The fifth portion 50 is formed in such a manner that it goes downward and toward the outside in the vehicle width direction as it goes toward the rear, and can transmit a front collision load to a frame (such as a lower longitudinal member) in the vehicle body structure member behind the front member 2.

[0121] <Transmission of Collision Load in Side Frame etc.>

[0122] In the side frame 3, the first part 10 is designed to have a lower strength against a frontal collision load compared to the second part 20, the third part 30, the fourth part 40, and the fifth part 50. That is, in a frontal collision of the vehicle, the first part 10 is preferentially damaged due to the frontal collision load (collision load) input via the bumper, and absorbs the frontal collision energy (collision energy).

[0123] The first part 10 is crushed at the foremost vulnerable part 11a.

[0124] Here, the strength behind the foremost vulnerable part 11a is increased due to a set of straight ribs 12b, V-shaped ribs 12c, and the intersection part 12d. Therefore, the region R1 between the flat part 13 at the first part 10 and the straight ribs 12b, V-shaped ribs 12c, and the intersection part 12d behind the foremost vulnerable part 11a buckles.

[0125] Next, the first part 10 is crushed at the second foremost vulnerable part 11a. Here, the strength behind the second foremost vulnerable part 11a is increased due to a set of straight ribs 12b, V-shaped ribs 12c, and the intersection part 12d. Therefore, the region R2 between the flat part 13 at the first part 10 and the straight ribs 12b, V-shaped ribs 12c, and the intersection part 12d behind the second foremost vulnerable part 11a buckles.

[0126] It should be noted that the interval between the opposed wall parts 11, 11 in the region corresponding to the foremost vulnerable part 11a is smaller than the interval between the opposed wall parts 11, 11 in the region corresponding to the second foremost vulnerable part 11a. That is, at the first part 10, the strength of the region R1 corresponding to the foremost vulnerable part 11a is lower than the strength of the region R2 corresponding to the second foremost vulnerable part 11a. Thus, the first part 10 can reliably cause the crushing and buckling of the region R1 corresponding to the foremost vulnerable part 11a to precede the crushing and buckling of the region R2 corresponding to the second foremost vulnerable part 11a.

[0127] Next, the frontal collision load that has not been absorbed by the first part 10 is transmitted to the second part 20. A part of the frontal collision load transmitted to the second part 20 is transmitted to the frame (such as the lower longitudinal beam) in the body part behind the front part 2 via the third part 30, the fourth part 40, and the fifth part 50. In addition, another part of the frontal collision load transmitted to the second part 20 is transmitted to the frame (such as the front pillar) in the body part behind the front part 2 via the connecting part 5 and the upper member 4. Here, the second part 20 is crushed and buckled at the vulnerable part 21a to absorb a part of the frontal collision energy.

[0128] The vehicle frame structure (front member 2, side frame 3, first portion 10) according to an embodiment of the present invention includes: a pair of opposed wall portions 11, 11 extending in the vehicle longitudinal direction; a connecting wall portion 12 extending in the vehicle longitudinal direction and connecting the pair of opposed wall portions 11, 11; a plurality of bridging ribs formed on the connecting wall portion 12 so as to connect the pair of opposed wall portions 11, 11; and a weak portion 11a formed on the opposed wall portion 11 and / or the connecting wall portion 12, the weak portion 11a being formed between two adjacent ones of the bridging ribs in the vehicle longitudinal direction.

[0129] Therefore, the vehicle frame structure has the weak portion 11a between adjacent bridging ribs in the frame cross section, whereby it is possible to repeatedly generate a reaction force by the bridging ribs and crush at the weak portion against a load in the longitudinal direction, and efficiently absorb collision energy.

[0130] The vehicle frame structure includes parallel ribs 12a formed at the vehicle width direction intermediate portion of the connecting wall portion 12 so as to connect the plurality of bridging ribs.

[0131] Therefore, the vehicle frame structure can improve the rigidity of the frame by cross-connecting the parallel ribs 12a and the bridging ribs, and increase the amount of absorbed collision energy. In addition, the vehicle frame structure can shorten the crushing range (crushing distance) by stopping the crushing of the weak portion 11a at the intersection portion 12d, and achieve successive crushing to improve the absorption efficiency of collision energy.

[0132] The vehicle frame structure includes V-shaped V ribs 12c as the bridging ribs, which are formed to connect the pair of opposed wall portions 11, 11 by means of an intersection portion 12d that intersects the parallel ribs 12a.

[0133] The V ribs 12c are formed to connect, in the opposed wall portion 11, an inner end portion of the weak portion 11a in the vehicle longitudinal direction or a portion inward of the weak portion 11a in the vehicle longitudinal direction to the intersection portion 12d disposed inward of the weak portion 11a in the vehicle longitudinal direction, and the apex of the V ribs 12c is located at the intersection portion 12d.

[0134] Therefore, due to the strength difference between the weak portion 11a and the V ribs 12c inward in the vehicle longitudinal direction, the vehicle frame structure reliably generates crushing at the weak portion 11a, can appropriately control the crushing mode, and improve the absorption efficiency of collision energy.

[0135] The vehicle frame structure includes straight ribs 12b as the bridging ribs that intersect the parallel ribs 12a, and the V ribs 12c are disposed between the weak portion 11a and the straight ribs 12b.

[0136] Therefore, due to the strength difference between the vulnerable part 11a and the V-shaped rib 12c and the straight rib 12b on the inner side in the vehicle longitudinal direction of the vehicle body, the vehicle frame structure more reliably generates crushing at the vulnerable part 11a, can appropriately control the crushing mode, and further improves the absorption efficiency of the collision energy.

[0137] The vehicle frame structure includes a straight rib 12b that intersects with the parallel rib 12a as the erection rib.

[0138] Therefore, due to the strength difference between the vulnerable part 11a and the straight rib 12b on the inner side in the vehicle longitudinal direction of the vehicle body, the vehicle frame structure reliably generates crushing at the vulnerable part 11a, can appropriately control the crushing mode, and improves the absorption efficiency of the collision energy.

[0139] In the vehicle frame structure, the intersection part 12d of the erection rib and the parallel rib 12a is columnar.

[0140] Therefore, the vehicle frame structure can improve the support performance against the collision load by increasing the rigidity of the intersection part 12d, and can appropriately prevent the crushing of the vulnerable part 11a on the outer side in the vehicle longitudinal direction of the vehicle body. In addition, the vehicle frame structure can ensure the rigidity against the collision from other directions than the vehicle longitudinal direction.

[0141] In the vehicle frame structure, the interval between the pair of opposed wall parts 11, 11 widens as it approaches the inner side in the vehicle longitudinal direction.

[0142] Therefore, the vehicle frame structure can protect the peripheral components arranged around the area by actively crushing in the area on the outer side in the vehicle longitudinal direction with a smaller cross-section and suppressing crushing (compared with the area on the outer side in the vehicle longitudinal direction with a smaller cross-section) in the area on the inner side in the vehicle longitudinal direction with a larger cross-section.

[0143] The vehicle frame structure is a side frame 3 arranged on the outer side in the vehicle longitudinal direction compared with the wheel house 6.

[0144] Therefore, the vehicle frame structure can suppress the influence on the wheels and actively absorb the collision energy in the vehicle longitudinal direction.

[0145] The vehicle frame structure integrally includes the wheel house 6.

[0146] Therefore, the vehicle frame structure can suppress the influence on the wheels and actively absorb the collision energy in the vehicle longitudinal direction, and can improve the manufacturability of the vehicle body by integrating the side frame 3 and the wheel house 6.

[0147] The vehicle frame structure is formed by die casting of aluminum.

[0148] Therefore, the vehicle frame structure can improve the absorption performance of collision energy, and can achieve recyclability, CO 2 emission reduction and high rigidity.

[0149] The embodiments of the present invention have been described above, but the present invention is not limited to the foregoing embodiments and can be appropriately modified without departing from the gist of the present invention. For example, the opposing wall portions 11, 11 may be an upper wall portion and a lower wall portion, and the connecting wall portion may be an inner wall portion that connects the inner end portions in the vehicle width direction of the upper wall portion and the lower wall portion. In addition, the vulnerable portion is not limited to the reinforcing rib, and may be a thin wall portion formed to be thinner than other portions. In addition, the vulnerable portion may be formed in the connecting wall portion. That is, the vulnerable portion may be formed in the connecting wall portion instead of the opposing wall portion, or may be formed across at least one of the pair of opposing wall portions and the connecting wall portion. In addition, the body structure member to which the vehicle frame structure is applied is not limited to the foregoing. For example, it may be a configuration integrally including a pair of front members 2, 2, an instrument panel connecting the front members 2, 2, and a pair of front pillars in the vehicle width direction that are connected to the rear ends of the side frame 3 and the upper member 4 and extend in the vertical direction. In addition, the vehicle frame structure of the present invention can also be applied to the rear part of the vehicle body.

Claims

1. A vehicle frame structure, characterized in that: include: A pair of opposing wall portions extending in the front-rear direction of the vehicle body; A connecting wall portion extending in the front-rear direction of the vehicle body and connecting the pair of opposing wall portions; a plurality of bridge ribs formed on the connecting wall portion in a manner of connecting the pair of opposing wall portions; as well as a fragile portion formed on the opposing wall portion and / or the connecting wall portion, The fragile portion is formed so as to be located between two adjacent bridge ribs in the front-rear direction of the vehicle body.

2. The vehicle frame structure according to claim 1, characterized in that: A parallel rib is provided which is formed at a middle portion of the connecting wall portion in the vehicle width direction so as to connect the plurality of the bridge ribs.

3. The vehicle frame structure according to claim 2, characterized in that: A V-shaped V-shaped rib is provided as the bridge rib, and the V-shaped rib is formed so as to connect the pair of the opposing wall portions via an intersection portion intersecting with the parallel rib, The V-shaped rib is formed so as to connect the inner end of the fragile portion in the front-rear direction of the vehicle body or a portion located inwardly of the fragile portion in the front-rear direction of the vehicle body with the intersection portion arranged inwardly of the fragile portion in the front-rear direction of the vehicle body, The apex of the V-shaped rib is located at the intersection.

4. The vehicle frame structure according to claim 3, characterized in that: The bridging ribs are provided with straight ribs intersecting the parallel ribs. The V-shaped rib is disposed between the fragile portion and the straight rib.

5. The vehicle frame structure according to claim 2, characterized in that: The bridge ribs include straight ribs that intersect the parallel ribs.

6. The vehicle frame structure according to claim 2, characterized in that: The intersection of the erection rib and the parallel rib is columnar.

7. The vehicle frame structure according to claim 1, characterized in that: The distance between the pair of opposing wall portions increases toward the inner side in the front-rear direction of the vehicle body.

8. The vehicle frame structure according to claim 1, characterized in that: The side frame is arranged outwardly of the wheel house in the front-rear direction of the vehicle body.

9. The vehicle frame structure according to claim 8, characterized in that: The wheel house is integrally provided.

10. The vehicle frame structure according to any one of claims 1 to 9, characterized in that: Formed by aluminum die casting.

Images