JP2018199431A - Vehicle body front part structure - Google Patents

Abstract

An object of the present invention is to absorb a load even when a space in a space inside a rectangular frame is expanded as compared with a conventional case. A pair of left and right front side frames extending in the vehicle front-rear direction and a pair of left and right front side frames respectively arranged outside the front side frames in the vehicle width direction and extending in the vehicle front-rear direction. Upper members 14 are provided, and each upper member 14 has a lower portion 14b on the front side of the vehicle inclined toward the outside in the vehicle width direction and a weak portion 112 provided on the inside in the vehicle width direction. FIG.

Description

  The present invention relates to a front body structure of a vehicle such as an automobile.

  For example, Patent Literature 1 discloses a frame body that is formed in a rectangular shape when viewed from the front by a side stay and a lower bulk member of a front bulkhead, an upper member, and a connecting member. For example, a space for accommodating lights such as fog lamps is formed in the rectangular frame.

Japanese Patent No. 5470340

  By the way, when expanding the space in a space part by adding another component in the space part of a frame, it is possible to curve an upper member to the outer side of a vehicle width direction, for example. However, when the upper member is simply curved outward, for example, if a frontal collision load is input to the upper member, the upper member deforms or bends outward, and the frontal collision load cannot be absorbed efficiently. There is a bug.

  The present invention has been made in view of the above points, and even when the space in the rectangular frame body is expanded as compared with the conventional case, the vehicle body can absorb the load. An object is to provide a partial structure.

  In order to achieve the above object, the present invention provides a pair of left and right front side frames extending along the vehicle front-rear direction and the outside of each front side frame in the vehicle width direction. A pair of left and right upper members that extend, each upper member having a front end portion that is inclined toward the outer side in the vehicle width direction and a fragile portion that is provided on the inner side in the vehicle width direction. And

  In the present invention, it is possible to obtain a vehicle body front part structure capable of absorbing a load even when the space of the space in the rectangular frame is expanded as compared with the conventional case.

It is a partial composition front view of the vehicle body front part to which the vehicle body front part structure concerning the embodiment of the present invention was applied. (A) is the partial structure perspective view containing the vehicle body front part right side shown in FIG. 1, (b) is the elements on larger scale of the A section shown to (a). FIG. 2 is a partially enlarged front view of the right side of the front part of the vehicle body shown in FIG. It is a partial expansion perspective view which shows the state which removed the bracket from the connection site | part of a front side inner member and a rear side inner member. It is a partial expansion perspective view which shows the state which attached the bracket to the connection part of a front side inner member and a rear side inner member. It is a side view of the upper member lower part of a right upper member. FIG. 7 is a transparent side view of the lower part of the upper member shown in FIG. 6. (A) is a top view of a connection member, (b) is a bottom view of a connection member. (A) is a top view of the front side member which comprises a connection member, (b) is a top view of a back side member. It is a disassembled side view which shows the state by which the front side member and rear side member which comprise a connection member are connected along a vehicle front-back direction.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In each figure, “front and rear” indicates the vehicle longitudinal direction, “left and right” indicates the vehicle width direction (left and right direction), and “up and down” indicates the vertical vertical direction.

  A vehicle to which a vehicle body front structure according to an embodiment of the present invention is applied has a vehicle body formed of a monocoque body. The vehicle body is arranged symmetrically with respect to a center line (not shown) that extends along the vehicle longitudinal direction through the center in the vehicle width direction of the vehicle.

  As shown in FIG. 1, the vehicle body front portion 10 includes a pair of left and right front side frames 12 and 12, a pair of left and right upper members 14 and 14, a pair of left and right connecting members 16 and 16, a front bulkhead 18, A damper housing 100 and a damper base 102 (see FIG. 2A) are provided.

  As shown in FIG. 2 (a), a pair of left and right damper housings 100, 100 for storing dampers (not shown) are provided above the rear end portions of the front side frames 12 in the vehicle. A pair of left and right damper bases 102 and 102 that support a damper (not shown) are provided on the upper portion of each damper housing 100. In FIG. 2A, only the right damper housing 100 and the right damper base 102 are illustrated, and the left damper housing 100 and the left damper base 102 are not illustrated.

  The damper housing 100 is disposed between each upper member 14 and each front side frame 12 along the vehicle width direction. The damper housing 100 includes an inner side wall of the upper member 14 and a plurality of side flange portions 103 (only the side flange portion 103 joined to the upper member 14 is illustrated in FIG. 2A). Each is fixed to the outer side wall of the front side frame 12. The damper housing 100 and the damper base 102 are formed of members having higher rigidity and strength than the upper member 14.

  As shown in FIG. 1, the pair of left and right front side frames 12, 12 are respectively arranged on the left and right sides along the vehicle width direction and extend along the vehicle front-rear direction. In addition, the vehicle rear end of each front side frame 12 is branched into two and connected to a cross member (not shown).

  The pair of left and right upper members 14, 14 are respectively disposed on the outer side in the vehicle width direction of the pair of left and right front side frames 12, 12, and extend along the vehicle front-rear direction. The vehicle rear end of each upper member 14 is connected to a pair of left and right front pillars (not shown).

  As shown in FIG. 2A, each upper member 14 includes an upper member upper part 14a and an upper member lower part (front end part on the vehicle front side) 14b. The upper member upper portion 14a extends from an unillustrated front pillar with a downward slope toward the front of the vehicle. The upper member lower portion 14b extends along the vertical direction from the upper member upper portion 14a toward the vehicle lower side with a downward slope.

  The upper member lower portion 14b positioned on the vehicle front side with respect to the upper member upper portion 14a is inclined toward the outer side in the vehicle width direction. That is, as shown in FIG. 3, both the outer edge 104 and the inner edge 106 along the vehicle width direction of the upper member lower portion 14 b are respectively in relation to the virtual outer edge and the virtual inner edge indicated by the vertical line V toward the tip. The separation distance (deviation amount) increases and is inclined outward. The amount of inclination of the upper member lower portion 14b to the outer edge 104 and the inner edge 106 may be the same or different from each other.

  As shown in FIG. 2A, each upper member 14 (upper member lower portion 14b) has a weakened portion 112 provided on the inner side in the vehicle width direction. The fragile portion 112 is configured by a cutout portion 114.

  The notch 114 is formed by notching the corner of the inner flange 116 of the upper member inner 108 in a substantially L shape in the upper member lower part 14b connected to the upper member upper part 14a (see FIG. 2B). . By cutting out the inner flange 116 of the upper member inner 108, the inner flange 118 of the upper member outer (outer member) 110 is exposed. In the present embodiment, the notched portion 114 is illustrated as the fragile portion 112, but is not limited to this, and may be replaced with another structure.

  In the present embodiment, the notch 114, which is the fragile portion 112, is disposed at a position close to the damper housing 100 inside the upper member 14 in the vehicle width direction, but is not limited thereto. The notch 114 that is the fragile portion 112 may be disposed at any location inside the upper member 14 in the vehicle width direction and between the connecting member 16 and the damper housing 100.

  In each upper member 14, the upper member inner 108 and the upper member outer 110 have a closed cross section, and the flanges are integrally joined. As shown in FIG. 4, the upper member upper portion 14a located on the rear side of the vehicle includes a front inner member 108a on the front side of the vehicle and a rear inner member 108b on the rear side of the vehicle. FIG. 4 shows a state where the bracket 126 is removed from the connecting portion of the front inner member 108a and the rear inner member 108b shown in FIG.

  As shown in FIG. 4, in the right upper member 14, a substantially rectangular outer notch 120 is formed at the upper end of the front inner member 108 a behind the vehicle. A substantially rectangular outer notch 122 is formed at the upper end of the rear inner member 108b in front of the vehicle. A substantially rectangular gap 124 is formed by the outer notch 120 of the front inner member 108a and the outer notch 122 of the rear inner member 108b. The outer member 110 disposed outside the front inner member 108a and the rear inner member 108b is formed continuously.

  The gap 124 is joined (covered) by a bracket 126 that connects the front inner member 108a and the rear inner member 108b to each other. In other words, the gap 124 is provided at the connecting portion between the front inner member 108a and the rear inner member 108b.

  As shown in FIG. 5, the bracket 126 includes a patch-like bracket main body 128 and a support portion 132 provided on the upper portion of the bracket main body 128 and formed with a bolt mounting hole 130. The bracket 126 holds the water tank 134 (see FIG. 2A), and the water tank 134 is attached to the support portion 132 via a bolt (not shown).

  The upper member outer 110, the front inner member 108a, and the bracket 126 are integrally joined together by spot welding or the like. The upper member outer 110, the rear inner member 108b, and the bracket 126 are integrally joined by spot welding or the like.

  As shown in FIG. 6, another weakened portion 140 is provided on the outer side in the vehicle width direction of the upper member lower portion 14 b of the right upper member 14. This other weak part 140 is comprised by the 1st bead 142 and the 2nd bead 144 which are arrange | positioned at predetermined intervals. The first bead 142 is located in front of the vehicle and is configured by a substantially arc-shaped recess when viewed from the side. The second bead 144 is located on the rear side of the vehicle with respect to the first bead 142 and is configured by a substantially arc-shaped recess when viewed from the side. As shown in the transparent side view of FIG. 7, the first bead 142 is located outside the connecting member 16 in the vehicle width direction. The first bead 142 extends in the vertical direction along the upper member lower portion 14b extending in the vertical direction. By providing the first bead 142 and the second bead 144 on the outer side of the upper member lower portion 14b of the right upper member 14 in the vehicle width direction, the first bead 142 and the second bead 144 are strong against the load in the vehicle width direction (left-right direction) and against the load in the vehicle front-rear direction. It is weak. Further, the upper member upper portion 14a has a bifurcated shape in which the upper and lower members are divided, and the inside thereof is joined to the damper housing 100, so that the load in the vehicle front-rear direction can be efficiently transmitted to the front pillar side (not shown). Can do.

  Returning to FIG. 1, the front bulkhead 18 is disposed at the front end of the vehicle. The front bulkhead 18 includes a pair of left and right side stays 34, 34, an upper bulk member 36, and a lower bulk member 38. The pair of left and right side stays 34 and 34 are disposed substantially parallel to each other in the vicinity of the front end portions of the pair of left and right front side frames 12 and 12 along the vertical vertical direction.

  A substantially rectangular frame 146 is disposed in front of the vehicle when viewed from the front. The frame body 146 includes an end portion in the vehicle width direction of a connecting member 16 that is located on the upper side and extends in the vehicle width direction, and a lower bulk member 38 that is located on the lower side and extends in the vehicle width direction. And an upper member 14 positioned outside in the vehicle width direction and extending along the vertical vertical direction, and a side stay 34 positioned inside inside the vehicle width direction and extending along the vertical vertical direction. Yes. A space portion 148 is formed inside the frame body 146. For example, lights such as fog lamps, sensors, and the like are accommodated in the space 148.

  The upper bulk member 36 is stretched between the upper ends of the pair of left and right side stays 34 along the vehicle width direction. The upper bulk member 36 has an open cross-section in which the axial straight section is substantially U-shaped. The opening of the open section faces downward. In the space formed by the open section, for example, a harness electrically connected to a hood open / close sensor that detects the open / close state of a hood (not shown), a bracket for attaching a hood lock (not shown), and the like are stored. ing.

  The lower bulk member 38 is bridged along the vehicle width direction between the lower ends of the pair of left and right upper member lower portions 14b, 14b. The lower bulk member 38 is positioned substantially below the upper bulk member 36 in the vertical vertical direction. Further, the lower bulk member 38 extends to both sides in the vehicle width direction with respect to the side stay 34 and is coupled to the upper member lower portions 14, 14.

  As shown in FIG. 1, the left connecting member 16 is disposed between the left upper member 14 and the left front side frame 12. The right connecting member 16 is disposed between the right upper member 14 and the right front side frame 12. Each connecting member 16 connects the pair of left and right upper members 14, 14 and the pair of left and right front side frames 12, 12 to each other along the vehicle width direction. Each connecting member 16 is formed of a member having higher rigidity and strength than the upper member 14.

  As shown in FIG. 8A, FIG. 8B, FIG. 9A, FIG. 9B, and FIG. 10, each connecting member 16 includes a front member 16a that is located in the front of the vehicle, and a vehicle rear. And a rear member 16b located at the rear. The front member 16a and the rear member 16b are integrally joined (coupled) by, for example, a welding means (not shown). The strength of the front member 16a is higher than the strength of the rear member 16b.

  Moreover, as for each connection member 16, each upper and lower surfaces of the front side member 16a and the rear side member 16b are being fixed in the vehicle front-back direction. That is, the upper flange portion 24 of the front member 16a and the upper flange portion 30 of the rear member 16b, and the lower flange portion 26 of the front member 16a and the lower flange portion 32 of the rear member 16b are connected from the vehicle front-rear direction. In this state, for example, they are integrally joined by welding means (not shown) or the like (see FIG. 8). In FIG. 8A and FIG. 8B, the “x” mark indicates the joint portion between the front member 16a and the rear member 16b.

  The cross section orthogonal to the longitudinal direction of the front member 16a is formed in a hat shape (see FIG. 10). Further, as shown in FIG. 9A, the front member 16a includes a front surface portion 20, an upper surface portion 21, side flange portions 22a and 22b, an upper flange portion 24, and a lower flange portion 26 (FIG. 8). And a lower surface portion 29 (see FIG. 10).

  The front portion 20 is formed in a substantially rectangular shape when viewed from the front side of the vehicle, and extends along the vehicle width direction on a substantially vertical surface. One side flange portion 22a is located outside the front surface portion 20 in the vehicle width direction and is connected (joined) to the upper member 14 (upper member lower portion 14b) at three points. The other side flange portion 22 b is located on the inner side in the vehicle width direction of the front surface portion 20 and is connected (joined) to the front side frame 12 at three points. The upper surface portion 21 and the lower surface portion 29 face each other in a substantially vertical vertical direction.

  As shown in FIG. 10, the upper flange portion 24 is formed to be bent with a right upward gradient at the vehicle rear side of the upper surface portion 21. The lower flange portion 26 is formed to be bent with a leftward downward slope on the vehicle rear side of the lower surface portion 29. The upper surface portion 21 is provided with a plurality of slits 27 extending along the vehicle front-rear direction.

  As shown in FIGS. 9B and 10, the rear member 16 b is formed on a substantially rectangular front surface portion 28 facing the front surface portion 20 of the front member 16 a, and an upper portion of the front surface portion 28. The upper flange portion 30 joined at three points with the upper flange portion 24 of 16a, and the lower flange joined at three points (see FIGS. 8A and 8B) with the lower flange portion 26 of the front member 16a. Part 32. As shown in FIG. 10, the upper surface portion 21 of the front member 16 a extends longer than the lower surface portion 29 toward the rear of the vehicle. As a result, the front portion 20 facing the vehicle rear of the rear member 16b is coupled to the front portion 20 facing the front of the vehicle of the front member 16a in a state where the front member 28 is inclined upward.

  The vehicle body front portion 10 to which the vehicle body front structure according to the present embodiment is applied is basically configured as described above. Next, the function and effect will be described.

  In this embodiment, the storage space in the space part 148 of the rectangular frame 146 increases by inclining the upper member lower part 14b (outer edge 104, inner edge 106) of the upper member 14 outward in the vehicle width direction. Thereby, for example, components such as sensors can be additionally stored in the space portion 148 of the frame.

  Further, in the present embodiment, the fragile portion 112 is provided in a portion between the connecting member 16 and the damper housing 100 on the inner side of the upper member 14 in the vehicle width direction. As a result, in this embodiment, even when the upper member lower portion 14b, which is the tip portion of the upper member 14, is inclined outward in the vehicle width direction, the fragile portion 112 receives the collision load input to the upper member 14. Absorption can prevent the upper member 14 from bending outward. In other words, when a collision load is input to the upper member 14, the upper member 14 is easily deformed toward the inside in the vehicle width direction having the fragile portion 112, and deformation of the upper member 14 to the outside is suppressed.

  In the present embodiment, a fragile portion 112 (notch portion 114) is provided between the damper housing 100 and the connecting member 16, which is inside the upper member 14 along the vehicle width direction and has higher rigidity and strength than the upper member 14. . Thereby, in this embodiment, a much larger strength difference can be generated in the fragile portion 112 whose rigidity strength is lower than that of the damper housing 100 and the connecting member 16. As a result, in the present embodiment, the upper member 14 can be prevented from being bent (deformed) in the vehicle width direction via the fragile portion 112.

  In the present embodiment, a first bead 142 including another fragile portion 140 is provided on an upper member lower portion 14 b that is a tip portion of the upper member 14. Thereby, in this embodiment, when a collision load is input with respect to the upper member 14, the upper member 14 can be bent at an early stage toward the vehicle rear from the first bead 142 as a starting point. Further, by providing the first bead 142 outside the upper member 14 in the vehicle width direction, the upper member 14 can be prevented from being deformed toward the outside in the vehicle width direction.

  In the present embodiment, the front inner member 108 a and the rear inner member 108 b are firmly connected (joined) with the bracket 126 that covers the gap 124. Accordingly, in the present embodiment, when an offset load is input to the upper member 14, it is possible to prevent the front inner member 108a and the rear inner member 108b from being separated from the upper member outer 110. Further, the bracket 126 can be shared with a bracket for holding a water tank, and the number of parts can be reduced.

  In the present embodiment, a gap 124 is formed between the front inner member 108a and the rear inner member 108b by the outer notch 120 of the front inner member 108a and the outer notch 122 of the rear inner member 108b. In the present embodiment, the gap 124 can prevent the upper member 14 from being enlarged. Further, the bracket 126 can suppress a decrease in rigidity strength due to the provision of the gap 124. Further, in the present embodiment, the bracket 126 is disposed at an upper portion of the damper housing 100 having relatively high rigidity and strength, so that damage or deformation of the bracket 126 when an offset load is input can be suppressed.

10 Car body front part 12 Front side frame 14 Upper member 14b Upper member lower part (tip part)
16 connecting member 100 damper housing 108a front inner member 108b rear inner member 110 upper member outer (outer member)
112 weak part 124 gap 126 bracket 134 water tank 140 other weak part 146 frame

Claims (5)

A pair of left and right front side frames extending along the longitudinal direction of the vehicle;
A pair of left and right upper members that are respectively arranged on the outer sides of the front side frames in the vehicle width direction and extend along the vehicle longitudinal direction;
With
Each of the upper members includes a front end portion of the vehicle that is inclined toward the outer side in the vehicle width direction and a weak portion provided on the inner side in the vehicle width direction. The vehicle front structure according to claim 1,
A pair of left and right connecting members that connect each front side frame and the tip of each upper member;
A damper housing for fixing the damper;
Further comprising
The vehicle front part structure, wherein the fragile part is provided between the damper housing and the connecting member. The vehicle front structure according to claim 4,
In the tip portion of each upper member, another fragile portion is provided,
Said other weak part is located in the vehicle width direction outer side of the said connection member, The vehicle front part structure characterized by the above-mentioned. The vehicle front structure according to any one of claims 1 to 3,
The upper part of each upper member has a front inner member and a rear inner member connected to the outer member,
The vehicle front structure, wherein the front inner member and the rear member are connected by a bracket that holds a water tank. The vehicle front structure according to claim 4,
The bracket is disposed at an upper position of the damper housing,
A vehicle front portion characterized in that a gap is provided between the front inner member and the rear member at a connecting portion where the bracket is connected to the front inner member and the rear member. Construction.

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