JP6669709B2 - Body rear structure - Google Patents

Description

  The present invention relates to a vehicle body rear structure, and more particularly to a vehicle body rear structure improved against rear collision.

  As a body rear structure of a vehicle such as an automobile, a rear panel extending in the vehicle width direction at a rear end of the vehicle body, left and right roof side rails provided on both sides in the vehicle width direction and extending in the front and rear direction at the upper part of the vehicle body, Left and right rear pillars (rear pillar extension members) extending rearward and downward from the rear end of each roof side rail are provided. Each rear pillar is provided outside in the vehicle width direction and the lower end is joined to the rear floor panel. A rear pillar stiffener, and a rear pillar inner that is joined to the inside of the rear pillar stiffener in the vehicle width direction to form a closed cross-sectional shape together with the rear pillar stiffener, and that bends the bent portion toward the rear of the vehicle body from the middle of the longitudinal direction and joins the rear panel to the rear panel, It is known to include a rear pillar extension joined to a bent portion of the rear pillar inner from the outside in the vehicle width direction. (E.g., Patent Document 1).

JP 2014-46813 A

  In the rear body structure as described in Patent Document 1, the load due to the rear collision is transmitted from the rear panel and the rear floor panel to the rear pillar, and further transmitted from the rear pillar to the roof side rail, and the rear body is deformed by the rear collision load. Is suppressed.

  The problem to be solved by the present invention is that transmission of a rear impact load to the front side of the vehicle body is performed even more favorably, and further improvement against rear collision is performed.

  A rear body structure according to the present invention includes a rear panel (26) extending in a vehicle width direction at a rear end of a vehicle body, and being joined to the rear panel (26) extending in a vehicle width direction and cooperating with the rear panel (26). A rear panel cross member (60) having a groove-shaped cross section that functions to form a closed cross section, and left and right roof side rails (64) provided on both sides in the vehicle width direction and extending in the front-rear direction at the upper part of the vehicle body. A left and right rear pillar extension member (66) including an upper end joined to a rear end of each roof side rail (64) and extending rearward and downward from the upper end, wherein each of the rear pillar extension members (66) is provided. , A groove-shaped cross-section member (80) and a lid member (82) joined to the groove-shaped cross-section member (80) to form a closed cross-sectional shape. Joined to the end

  According to this configuration, a rear impact load is transmitted from the rear panel (26) to the lid member (82), and the rear panel (26) and the rear panel cross member (60) are joined to the rear pillar extension member (66) in a closed cross-sectional shape. Therefore, the strength and rigidity of the joint between the rear panel (26) and the rear panel cross member (60) and each of the rear pillar extension members (66) are high, making it difficult to bend against a rear impact load and reducing the rear impact load to each roof side. Good transmission to the rail (64) is possible.

  In the vehicle body rear structure, preferably, each of the lid members (82) is further joined to an end of the rear panel cross member (60).

  According to this configuration, the rear impact load is transmitted to the lid member (82) from the rear panel cross member (60) in addition to the rear panel (26), and the rear pillar extension member (60) is connected to the rear panel (26) and the rear panel cross member (60). 66) is a joint of closed cross-sectional shapes, so the strength and rigidity of the joint between the rear panel (26) and the rear panel cross member (60) and each rear pillar extension member (66) are high, and they are bent against a rear impact load. It becomes difficult to transmit the rear impact load to each roof side rail (64) satisfactorily.

  The vehicle body rear structure preferably includes left and right side outer panels (10) joined to the corresponding roof side rails (64), a lower end (68B) joined to the rear panel cross member (60), and It further includes left and right garter frames (68) including an upper end (68A) joined to the rear pillar extension member (66) and including a portion forming a closed cross section in cooperation with the side outer panels (10).

  According to this configuration, the rear impact load is transmitted from the rear panel cross member (60) to the garter frame (68), and the rear impact load transmitted from the rear panel cross member (60) to the roof side rail (64) is dispersed. The rear impact load can be transmitted better to each roof side rail (64). This makes it more difficult for the rear portion of the vehicle body to be deformed.

  The above-mentioned rear body structure preferably includes left and right side inner panels (12) joined to the corresponding roof side rails (64), and the side inner panels extending in the vehicle width direction and corresponding to left and right ends. A rear parcel shelf (18) joined to the panel (12), and a rear bulkhead (24) provided below the rear parcel shelf (18) and separating a trunk room (20) and a passenger compartment (22). Further, the garter frame (68) includes a portion connected to the rear bulkhead (24) and the roof side rail (64) via the rear parcel shelf (18).

  According to this configuration, the rear impact load transmitted to the garter frame (68) is also transmitted to the rear bulkhead (24) and the roof side rail (64) via the rear parcel shelf 18, and the load is widely dispersed. This makes it more difficult for the rear portion of the vehicle body to be deformed.

  The rear body structure preferably includes left and right rear floor frames (42) provided on both sides in the vehicle width direction and extending in the front-rear direction, and a rear floor panel (56) joined to the rear floor frame (42). The left and right outriggers (74) joined to the respective rear floor frames (42) and cooperating with the lid member (82), the rear floor frame (42), and the rear floor panel (56) to form a closed section. Have more.

  According to this configuration, the rear impact load is also transmitted to the rear floor frame (42), and the load distribution to the rear pillar extension (66) and the garter frame (68) is promoted. This makes it more difficult for the rear portion of the vehicle body to be deformed.

  Preferably, the rear body structure further includes left and right rear wheel houses (54) joined to the respective rear floor frames (42), and the respective rear pillar extension members (66) include the rear wheel houses (54). From the rear end to the rear end of the rear floor frame (42), the rear floor frame (42) is joined to the rear floor frame (42) via the outrigger (74) and the rear floor panel (56).

  According to this configuration, the rear impact load is also transmitted to the rear wheel house (54), and the load distribution to the rear pillar extension (66) and the garter frame (68) is promoted. This makes it more difficult for the rear portion of the vehicle body to be deformed.

  The rear body structure preferably further includes a rear bumper beam (48) extending in the vehicle width direction and joined to each of the rear floor frames (42).

  According to this configuration, the rear impact load is also transmitted from the rear bumper beam (48) to the rear floor frame (42). This makes it more difficult for the rear portion of the vehicle body to be deformed.

  In the rear structure of the vehicle body, preferably, the closed cross-section formed by the rear panel (26) and the rear panel cross member (60) includes an inclined portion (26A, 60A) inclined from rear to front.

According to this configuration, the rear impact load is easily transmitted to the roof side rail (64).

  ADVANTAGE OF THE INVENTION According to the vehicle body rear structure by this invention, transmission of a rear collision load to a vehicle body front side is performed still more favorably, and further improvement with respect to a rear collision is made.

FIG. 2 is a perspective view from the rear side of the vehicle body, showing one embodiment of a vehicle body rear structure according to the present invention. Bottom view of the rear structure of the vehicle body of the present embodiment Side view showing the skeleton structure of the rear body structure of the vehicle body of the present embodiment Perspective view of the rear body structure of the embodiment viewed from a trunk room side. Enlarged perspective view of a main part of the rear body structure of the embodiment from the rear of the vehicle body. FIG. 2 is an enlarged perspective view of the vicinity of a rear end of a rear pillar extension member of a vehicle body rear structure according to the embodiment.

  Hereinafter, an embodiment of a vehicle body rear structure according to the present invention will be described with reference to FIGS.

  The vehicle body rear structure according to the present embodiment includes left and right side outer panels 10 and side inner panels 12, a roof panel 16, and a left and right side panel structure extending in the vehicle width direction as shown in FIG. A rear parcel shelf 18 joined to the corresponding left and right side inner panels 12, a rear bulkhead 24 provided below the rear parcel shelf 18 to separate a trunk room 20 and a passenger compartment 22, It has a rear panel (rear end panel) 26 extending at the end in the vehicle width direction, and a trunk lid 30 attached to the rear parcel shelf 18 by a hinge (not shown) to open and close an opening 28 of the trunk room 20. Rear combination lights 32 are attached to the rear portions of the left and right side outer panels 10, respectively.

  The opening 28 of the trunk room 20 includes an upper opening 28A that opens upward, and a rear opening 28B that opens rearward continuously to the rear of the upper opening 28A. The trunk lid 30 includes a front-rear extending portion 30A extending in the front-rear direction to open and close the upper opening 28A, and a vertical extending portion 30B extending in a vertical direction to open and close the rear opening 28B.

  The vehicle body rear structure according to the present embodiment includes left and right side sills 40 provided on both sides in the vehicle width direction and extending in the front-rear direction, as shown in FIG. Left and right rear floor frames (rear side frames) 42 having front ends 42A joined to corresponding side sills 40 having portions extending in the front-rear direction, and extending in the vehicle width direction to connect the left and right rear floor frames 42 to each other. A rear floor middle cross member 44 and a rear floor end cross member 46, a rear bumper beam 48 extending in the vehicle width direction and joined to the rear end 42B of each rear floor frame 42 across the rear panel 26, and a center in the vehicle width direction. Frame 5 connecting the rear floor end cross member 46 and the lower part of the rear panel 26 to each other With the door.

  Rear floor panels 52 are joined to the rear portions of the left and right side sills 40 and the left and right rear floor frames 42. The rear end of the rear floor frame 42 is joined to the rear panel 26. Rear floor panel 52 includes a trunk room bottom surface portion 52A that forms the bottom surface of trunk room 20. An upper protruding portion 52B (see FIGS. 5 and 6) that defines an underfloor space for disposing a driving battery 58 in a hybrid vehicle, an electric vehicle, or the like is formed in the trunk room bottom portion 52A.

  The left and right rear wheel houses 54 and the left and right rear floor panel expansion portions 56 are joined to the outside of each rear floor frame 42 in the vehicle width direction. As shown in FIG. 4, each rear floor panel extension 56 is joined to an upper portion of the rear floor frame 42 to close an opening of the hat-shaped cross section of the rear floor frame 42 which opens upward, and cooperates with the rear floor frame 42. And a lid portion 56A forming a closed cross-sectional shape.

  The rear structure of the vehicle body according to the present embodiment, as an upper frame structure, extends in the vehicle width direction at the rear end of the trunk room 20 as shown in FIGS. ), Left and right rear pillar members (C pillars) 62 erected upward from the respective rear floor frames 42, and provided on both sides in the vehicle width direction so that the upper part of the vehicle body extends in the front-rear direction. It has left and right roof side rails 64 that extend and front ends (upper ends) 66A that are joined to rear ends 64A of the roof side rails 64, and the left and right sides that extend substantially linearly rearward and downward from the front ends 66A. A rear pillar extension member (quarter pillar) 66 is joined to an upper end 68A joined to an intermediate portion of the rear pillar extension member 66 and an upper portion of the rear panel cross member 60. And a garter frame 68 including that lower end 68B. Each rear pillar extension member 66 and each garter frame 68 forming a pair on the left and right sides are collectively referred to as a rear upper frame 70.

  As shown in FIG. 3, each rear pillar member 62 includes a lower end 62A joined to the corresponding rear floor frame 42 and an upper end 62B joined to the vicinity of the upper end of the corresponding rear pillar extension member 66.

  As shown in FIG. 4, the rear panel cross member 60 includes a portion extending along a lower edge of the opening 28 of the trunk room 20. The garter frame 68 includes a portion extending along left and right side edges of the opening 28 of the trunk room 20. The rear panel cross member 60 and the lower end 68B of each garter frame 68 cooperate with each other to define lower left and right corners of the opening 28 of the trunk room 20.

  As shown in FIGS. 4 and 5, the rear panel cross member 60 has a groove-shaped cross section (hat-shaped cross section) and forms a closed cross section in cooperation with the rear panel 26. The rear panel 26 and the rear panel cross member 60 include side extension portions 26A and 60A extending outward from the respective rear panel cross members 60. Each of the side extension portions 26A and 60A is inclined forward and backward so that the outer end side is located on the front side. Each side extension 26A and 60A may be referred to as a ramp. With this inclined portion, the collision load is easily transmitted to the roof side rail 64.

  As shown in FIG. 4, the rear panel cross member 60 and each rear floor frame 42 are connected to each other by left and right brace members 72 extending vertically. The brace member 72 has a groove-shaped cross-sectional shape (hat-shaped cross-sectional shape), and is joined to the rear panel 26, the lid 56A of the rear floor panel expansion portion 56, and the rear panel cross member 60, and cooperates therewith to form a closed cross-sectional shape. Is configured.

  As shown in FIG. 3, each garter frame 68 has a hook-like shape when viewed from the side, and cooperates with the rear pillar extension member 66 to surround the arrangement portion of the rear combination light 32. Includes a portion that forms a substantially triangular frame when viewed. Thus, the rear upper frame 70 bypasses the portion where the rear combination light 32 is disposed, so that the degree of freedom in designing the rear combination light 32 is not hindered.

  As shown in FIG. 4, each garter frame 68 includes a groove-shaped cross-sectional portion to which the corresponding side outer panel 10 is joined, and forms a closed cross-sectional shape in cooperation with the side outer panel 10. Thus, the strength and rigidity of the garter frame 68 are improved, and the transmission of the collision load by the garter frame 68 is reliably performed. Each garter frame 68 includes a portion connected to the rear bulkhead 24 and the corresponding roof side rail 64 via the rear parcel shelf 18 as shown in FIG.

  As shown in FIGS. 4 to 6, each rear pillar extension member 66 has a groove-shaped cross-section member 80 and a flat lid member 82 joined to the groove-shaped cross-section member 80. The groove-shaped cross section member 80 has a hat-shaped cross section that opens toward the trunk room 20 side. The lid member 82 is closer to the trunk room 20 than the groove-shaped cross-section member 80 and covers the opening of the groove-shaped cross-section member 80. Thus, the rear pillar extension member 66 has a closed cross-sectional shape constituted by the groove-shaped cross-sectional member 80 and the lid member 82. Thereby, the strength and rigidity of the rear pillar extension member 66 are improved, and the transmission of the collision load by the rear pillar extension member 66 is reliably performed.

  The rear end (lower end) 66B of each rear pillar extension member 66 is at a position offset to the outside in the vehicle width direction from the lower end 68B of the corresponding garter frame 68, and the rear panel 26, the rear floor panel extension 56, and the rear panel Each of the cross members 60 is joined to the left and right outer ends. The joint between the lid member 82 and the rear floor panel extension 56 at the rear end 66B extends linearly from the rear end of the rear wheel house 54 to the rear end of the rear floor panel extension 56, as shown in FIG. Are there. The rear end of the rear floor panel extension 56 and the rear end 42B of the rear floor frame 42 are located at the same position in the front-rear direction.

  As shown in FIGS. 4 and 6, right and left outriggers 74 are provided below each rear floor panel extension 56 and are joined to the bottom of each rear floor frame 42 and the vicinity of the lower end of the corresponding lid member 82. ing. Each of the outriggers 74 has a front-rear length that extends over the entire length of the rear floor panel extension portion 56 in the front-rear direction, and forms a closed cross section in cooperation with the corresponding rear floor frame 42 and rear floor panel extension portion 56.

  On the side of the trunk room 20 of the vertically extending portion 30B of the trunk lid 30, as shown in FIGS. 1, 4, and 5, it extends substantially horizontally in the vehicle width direction, and both ends are joined to the trunk lid 30. A beam member 84 made of a pipe material is provided.

  In the vicinity of the lower end of each garter frame 68, as shown in FIGS. 1, 4 and 5, at a position facing the front of the left and right ends of the beam member 84 with the trunk lid 30 in the closed position, The left and right restraining members 86 are fixed. Each of the restraining members 86 includes a main portion 86B defining a concave portion 86A opened rearward to receive the beam member 84 displaced forward at the time of a rear collision, and a standing piece portion rising from the rear edge of the main portion 86B in the vehicle width direction. 86C. The upright piece 86C forms a rib to increase the bending rigidity of the main part 86B.

  As shown in FIG. 4, a striker mounting housing 88 is joined to an intermediate portion of the vertically extending portion 30B of the trunk lid 30 in the vehicle width direction. The striker mounting housing 88 supports the striker 90. A latch member 92 with which a striker 90 is detachably engaged is attached to an intermediate portion of the rear panel cross member 60 in the vehicle width direction.

  The beam member 84 penetrates the striker mounting housing 88 in the vehicle width direction, and an intermediate portion in the vehicle width direction is supported by the striker mounting housing 88 from the trunk lid 30.

  According to the vehicle body rear structure having the above-described configuration, the collision load at the time of a rear collision is transmitted from the rear panel 26 and the rear panel cross member 60 to the rear pillar extension member 66, and further transmitted from the rear pillar extension member 66 to the corresponding roof side rail 64. . Since the rear panel 26 and the rear panel cross member 60 and the rear pillar extension member 66 are joined to each other in a closed cross-sectional shape, the strength and rigidity of the joint between the rear panel 26 and the rear panel cross member 60 and each rear pillar extension member 66 are high, and the collision occurs. It becomes difficult to bend with respect to the load, and the collision load can be transmitted well to each roof side rail 64. As a result, the rear portion of the vehicle body is more difficult to deform, and the collision load is less likely to be applied to the driving battery 58.

  The collision load is also transmitted from the rear panel cross member 60 to the garter frame 68. Thereby, the collision load transmitted from the rear panel cross member 60 to the roof side rails 64 is dispersed, and the collision load is transmitted more favorably by each roof side rail 64. As a result, the rear portion of the vehicle body is less likely to be deformed, and the collision load is less likely to be applied to the driving battery 58.

  The collision load transmitted to the garter frame 68 is also transmitted to the rear bulkhead 24 and the roof side rail 64 via the rear parcel shelf 18, and the load is widely dispersed. The collision load is also transmitted to the rear floor frame 42 and the rear wheel house 54, and the load distribution to the rear pillar extension member 66 and the garter frame 68 is promoted. The collision load is also transmitted from the rear bumper beam 48 to the rear floor frame 42. As a result, the rear portion of the vehicle body is more difficult to deform.

  The collision load from the rear bumper beam 48 is transmitted to each rear upper frame 70 and each rear floor frame 42, and the rear portion of the vehicle body is less likely to be deformed. This also protects the driving battery 58.

  Since the rear panel cross member 60 and each of the rear floor frames 42 are connected to each other by the brace member 72, the connection strength between the rear panel cross member 60 and each of the rear floor frames 42 is improved. The collision load is reliably transmitted.

  When the trunk lid 30 is displaced forward due to a rear collision, the beam member (84) is displaced forward accordingly, and the left and right ends of the beam member 84 engage with the concave portions 86A of the restraining member 86, and the beam member 84 The left and right ends are received by the restraining member 86. Thereby, the collision load is transmitted from the beam member 84 to the rear upper frame 70, and the trunk room 20 is prevented from being largely deformed by the collision load. As a result, even if the driving battery 58 is disposed in the trunk room 20 or in the front of the trunk room 20, the collision load hardly spreads on the driving battery 58, and the driving battery 58 is protected against rear collision.

  Since the beam member 84 is provided on the vertically extending portion 30 </ b> B of the trunk lid 30, the load due to the rear collision easily acts on the beam member 84, and the collision load is reliably transmitted to the rear upper frame 70.

  Since the collision load due to the rear collision is also transmitted to the rear panel cross member 60 from the engagement portion between the striker 90 and the latch member 92, the transmission of the collision load from the beam member 84 to the rear upper frame 70 is performed in the vehicle width direction. It is performed not only from both ends but also from the middle part in the vehicle width direction. Thereby, the collision load is dispersed and transmitted.

  Since the restraining member 86 includes the upright piece 86C rising from the edge of the main portion 86B, the strength and the rigidity are increased, and the receiving of the beam member 84 by the restraining member 86 is reliably performed.

  As described above, the present invention has been described with respect to the preferred embodiments. However, as will be easily understood by those skilled in the art, the present invention is not limited to such embodiments, and departs from the spirit of the present invention. It can be changed appropriately within a range not to be performed. For example, the structure including the beam member 84 and the restraint member 86 can be equally applied to a tailgate of a batch-back type automobile. In addition, all of the components shown in the above-described embodiments are not necessarily essential, and can be appropriately selected without departing from the spirit of the present invention.

10: Side outer panel 12: Side inner panel 16: Roof panel 18: Rear parcel shelf 20: Trunk room 22: Car room 24: Rear bulkhead 26: Rear panel 26A: Side extension 28: Opening 28A: Upper opening 28B: Rear Opening 30: Trunk lid 30A: Front-back extension 30B: Vertical extension 32: Rear combination light 40: Side sill 42: Rear floor frame 42A: Front end 42B: Rear end 44: Rear floor middle cross member 46: Rear floor end cross member 48 : Rear bumper beam 50: Connecting frame 52: Rear floor panel 52A: Trunk room bottom part 52B: Upper protruding part 54: Rear wheel house 56: Rear floor panel expansion part 56A: Lid part 58: Driving battery 60: Rear panel Cross member 62: Rear pillar member 62A: Lower end 62B: Upper end 64: Roof side rail 64A: Rear end 66: Rear pillar extension member 66A: Front end 66B: Rear end 68: Garter frame 68A: Upper end 68B: Lower end 70: Rear upper frame 72: Brace member 74: Outrigger 80: Groove section member 82: Cover member 84: Beam member 86: Restriction member 86A: Recess 86B: Main portion 86C: Standing piece portion 88: Housing for mounting a striker 90: Striker 92: Latch member

Claims (7)

A rear panel extending in a vehicle width direction at a rear end of the vehicle body;
A rear panel cross member having a groove-shaped cross section extending in the vehicle width direction and joined to the rear panel and cooperating with the rear panel to form a closed cross section;
Left and right roof side rails provided on both sides in the vehicle width direction and extending the upper part of the vehicle body in the front-rear direction,
Right and left rear pillar extension members including a front end joined to a rear end of each of the corresponding roof side rails, and extending rearward and downward from the front end;
Left and right side outer panels joined to the corresponding roof side rails,
A left and right garter frame including a lower end joined to the rear panel cross member and an upper end joined to each of the rear pillar extension members, forming left and right garter frames in cooperation with the respective side outer panels;
Each of the rear pillar extension members has a closed cross-sectional shape formed by a groove-shaped cross-sectional member and a lid member joined to the groove-shaped cross-sectional member,
A vehicle body rear structure in which each of the lid members is joined to an end of the rear panel. Left and right side inner panels joined to the corresponding roof side rails,
A rear parcel shelf that extends in the vehicle width direction and has left and right ends joined to the corresponding side inner panels,
A rear bulkhead that is provided below the rear parcel shelf and separates a trunk room and a vehicle compartment,
The vehicle body rear structure according to claim 1, wherein the garter frame includes a portion connected to the rear bulkhead and the roof side rail via the rear parcel shelf . A rear panel extending in a vehicle width direction at a rear end of the vehicle body;
A rear panel cross member having a groove-shaped cross section extending in the vehicle width direction and joined to the rear panel and cooperating with the rear panel to form a closed cross section;
Left and right roof side rails provided on both sides in the vehicle width direction and extending the upper part of the vehicle body in the front-rear direction,
Right and left rear pillar extension members including a front end joined to a rear end of each of the corresponding roof side rails, and extending rearward and downward from the front end;
Left and right rear floor frames provided on both sides in the vehicle width direction and extending in the front-rear direction,
A rear floor panel joined to the rear floor frame ,
Each of the rear pillar extension members has a closed cross-sectional shape formed by a groove-shaped cross-sectional member and a lid member joined to the groove-shaped cross-sectional member,
Each of the lid members is joined to an end of the rear panel,
Further, a vehicle body rear structure having left and right outriggers joined to the respective rear floor frames and forming closed cross sections in cooperation with the lid member, the rear floor frame, and the rear floor panel. Further comprising left and right rear wheel houses joined to the respective rear floor frames,
The vehicle body rear structure according to claim 3, wherein each of the rear pillar extension members is joined to the rear floor frame via the outrigger and the rear floor panel from a rear end of the rear wheel house to a rear end of the rear floor frame.   The vehicle body rear structure according to claim 3 or 4, further comprising a rear bumper beam extending in a vehicle width direction and joined to each of the rear floor frames.   The vehicle body rear structure according to any one of claims 1 to 5, wherein each of the lid members is joined to an end of the rear panel cross member.   The vehicle body rear structure according to any one of claims 1 to 6, wherein the closed cross-section formed by the rear panel and the rear panel cross member includes an inclined portion inclined from rear to front.

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