Back door lock structure

Abstract

To provide a back door lock structure capable of suppressing disengagement of a lock and a striker in the event of a rear-end collision of the vehicle.SOLUTION: A back door lock structure 10 includes: a back door 2 provided with a first lock member that is one of a lock 20 and a striker 30 capable of engaging with each other; and a vehicle body 1 that is provided with a second lock member which is the other of the lock 20 and the striker 30. The back door 2 has an inner panel 2b, an outer panel 2a, a reinforcement panel 6 provided between the inner panel 2b and the outer panel 2a, and a mounting member 40 joined to the inner panel 2b together with the first lock member, and placed on a plane on the reinforcement panel 6 side of the inner panel 2b. The mounting member 40 is separably fixed to the reinforcement panel 6 by inputting a predetermined load to the first lock member.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a back door lock structure. [Background technology]

[0002] BACKGROUND ART Conventionally, a back door structure is known that includes a back door provided with one of a lock and a striker that are engageable with each other, and a vehicle body provided with the other of the lock and the striker (for example, Patent Document 1).

[0003] Patent Document 1 discloses an automobile equipped with an opening / closing body supported on the vehicle body so as to be able to pivot open and close, a striker fixed to one of the opening / closing body or the vehicle body, and a locking device provided on the other of the opening / closing body or the vehicle body. In Patent Document 1, a reinforcing member is fixed to the opening / closing body to suppress vibrations generated in the opening / closing body due to the impact the opening / closing body receives when the engagement between the striker and the locking device is released. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-106504 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the structure of Patent Document 1, the striker is fastened together with the reinforcing member and fixed to the inner panel of the tailgate, so if a rear-end collision occurs at a position lower than the bottom edge of the tailgate, a force acts on the tailgate to move the bottom edge toward the front of the vehicle. Therefore, if the tailgate is not easily deformed, the engagement between the lock and the striker may be released.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a tailgate lock structure that can prevent the engagement between the lock and the striker from being released in the event of a rear-end collision of the vehicle. [Means for solving the problem]

[0007] A tailgate lock structure according to one aspect of the present invention includes a tailgate provided with a first locking member, which is one of a lock and a striker that are engageable with each other, and a vehicle body provided with a second locking member, which is the other of the lock and the striker. The tailgate has a reinforcing panel provided between an inner panel and an outer panel, and an attachment member disposed on the surface of the inner panel facing the reinforcing panel and coupled to the inner panel together with the first locking member. The attachment member is detachably fixed to the reinforcing panel when a predetermined load is applied to the first locking member. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a back door lock structure that can prevent the engagement between the lock and the striker from being released in the event of a rear-end collision of the vehicle. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic perspective view showing the rear of a vehicle to which a back door lock structure according to an embodiment is applied. [Figure 2] FIG. 2 is a schematic cross-sectional side view of the rear of the vehicle shown in FIG. [Figure 3] FIG. 3 is a schematic exploded perspective view of the back door. [Figure 4] FIG. 4 is an enlarged view of the main part of FIG. [Figure 5] FIG. 5 is a plan view corresponding to the view seen from the arrow A in FIG. [Figure 6] FIG. 6 is an enlarged side cross-sectional view of a main part of the back door. [Figure 7] FIG. 7 is a cross-sectional view taken along line BB in FIG. [Figure 8] FIG. 8 is an enlarged side cross-sectional view of a main part of the back door showing a state in which the mounting member is separated from the reinforcing panel. [Figure 9] FIG. 9 is a cross-sectional view taken along line CC in FIG. [Figure 10] FIG. 10 is a schematic cross-sectional view of the rear part of the vehicle showing the state immediately before the collision. [Figure 11] FIG. 11 is a schematic cross-sectional view of the rear part of the vehicle showing the state after the collision. DETAILED DESCRIPTION OF THE INVENTION

[0010] The embodiments will be described with reference to the drawings. In the description of the drawings, the same parts are designated by the same reference numerals and the description thereof will be omitted.

[0011] [Backdoor lock structure] The configuration of a back door lock structure 10 according to this embodiment will be described with reference to Figures 1 to 11. In the drawings, the front side of the vehicle is designated as FR, the rear side of the vehicle as RR, the right side in the vehicle width direction as RH, and the left side in the vehicle width direction as LH.

[0012] As shown in FIGS. 1 to 7, the back door lock structure 10 includes a vehicle body 1, a back door 2, a lock 20, and a striker 30.

[0013] A rear-end cross member 4 is disposed at the rear of the vehicle body 1, forming part of the opening 3 of the vehicle body 1. The rear-end cross member 4 has an outer panel 4a and an inner panel 4b, forming a closed cross section. A lock plate 5 for attaching a lock 20 is attached to the front side of the rear-end cross member 4 using bolts 51 and nuts 52.

[0014] The back door 2 is attached to the vehicle body 1 so as to be able to open and close relative to an opening 3 of the vehicle body 1, with a hinge portion (not shown) provided at the front end portion as the rotation center. The back door 2 has an outer panel 2a and an inner panel 2b, forming a closed cross section.

[0015] A reinforcing panel 6 is disposed between the outer panel 2a and the inner panel 2b of the back door 2. The reinforcing panel 6 has an upper panel 6a and a lower panel 6b, forming a closed cross section. The lower panel 6b of the reinforcing panel 6 is provided with an insertion hole 6c through which a shaft portion of a bolt 53 and a nut 54 used to secure a striker 30 (described later) are inserted.

[0016] In addition to the reinforcing panel 6 shown in FIG. 3, other reinforcing panels are arranged, but these other reinforcing panels are not shown.

[0017] The lock 20 is attached to a lock plate 5 provided in an opening 3 of the vehicle body 1 using bolts and nuts (not shown), and engages with a striker 30 when the back door is closed.

[0018] A base plate 31 of the striker 30 is disposed on the surface of the inner panel 2b of the back door 2 opposite the reinforcing panel 6 side. On the other hand, a mounting member main body 41 of the mounting member 40 is disposed on the surface of the inner panel 2b of the back door 2 facing the reinforcing panel 6. The base plate 31 and the mounting member main body 41 are fastened together to the inner panel 2b with bolts 53 and nuts 54. In other words, the striker 30 is joined to the inner panel 2b together with the mounting member 40.

[0019] The mounting member 40 is fixed to the reinforcing panel 6 so as to be separable when a predetermined load is applied to the striker 30.

[0020] The mounting member body 41 of the mounting member 40 is fixed to the lower panel 6b of the reinforcing panel 6 by an adhesive sheet 42. The adhesive sheet 42 constitutes an easily separable portion that can be easily separated by the input of a predetermined load. This easily separable portion is not limited to the adhesive sheet 42, and may be constituted by a rivet, a clip, or the like.

[0021] The mounting member 40 also has a pair of mounting pieces 43, 43 extending outward in the vehicle width direction from both left and right end portions of the mounting member main body 41, and an easily breakable portion 44 formed between the mounting member main body 41 and the mounting piece 43 and capable of easily breaking when a predetermined load is applied. The mounting piece 43 is fixed to the lower panel 6b of the reinforcing panel 6 using a rivet 57.

[0022] In this embodiment, of the lock 20 and striker 30 that are engageable with each other, the lock 20 is provided at the opening 3 of the vehicle body 1, and the striker 30 is provided at the back door 2. However, conversely, the lock 20 may be provided at the back door 2, and the striker 30 may be provided at the opening 3 of the vehicle body 1.

[0023] [Operation of the back door lock mechanism during a rear-end collision] Next, with reference to FIGS. 8 to 11, the operation of the back door lock structure 10 when the rear of the vehicle collides with an obstacle such as the road surface (for example, the barrier 7) will be described.

[0024] As shown in FIG. 10, assume that a vehicle (vehicle body 1) moves from the right side to the left side (rear side) in the figure, and the rear of the vehicle body 1 collides with the barrier 7 at a location below the lower end BE of the back door 2.

[0025] When a rear-end collision of the vehicle occurs at a position lower than the lower end BE of the tailgate 2, a force acts to move the lower end BE of the tailgate 2 forward via the striker 30. In this case, the attachment member 40 separates from the reinforcing panel 6 as the striker 30 and the inner panel 2b of the tailgate 2 move forward.

[0026] As shown in Figures 8 and 9, when a predetermined load is applied, the adhesive sheet 42 constituting the easy-to-separate portion peels off and the easy-to-break portion 44 breaks, causing the mounting member main body 41 of the mounting member 40 to separate from the lower panel 6b of the reinforcing panel 6.

[0027] 11, the attachment member body 41 of the attachment member 40 is separated from the lower panel 6b of the reinforcing panel 6, which allows the striker 30 to move forward accompanied by deformation of the inner panel 2b of the tailgate 2. This prevents the engagement between the lock 20 and the striker 30 from being released and the tailgate 2 from opening.

[0028] [Actions and effects] The effects of this embodiment will be described below.

[0029] (1) A tailgate lock structure 10 includes a tailgate 2 provided with a first locking member, which is one of a lock 20 and a striker 30 that are engageable with each other, and a vehicle body 1 provided with a second locking member, which is the other of the lock 20 and the striker 30. The tailgate 2 has an inner panel 2b, an outer panel 2a, and a reinforcing panel 6 provided between the inner panel 2b and the outer panel 2a. The tailgate 2 also has an attachment member 40 that is disposed on the surface of the inner panel 2b facing the reinforcing panel 6 and is joined to the inner panel 2b together with the first locking member (in this embodiment, the striker 30). The attachment member 40 is separably fixed to the reinforcing panel 6 when a predetermined load is applied to the first locking member (the striker 30).

[0030] In this embodiment, the striker 30 is coupled to the inner panel 2b together with an attachment member 40 that is disposed on the surface of the inner panel 2b facing the reinforcing panel 6, and the attachment member 40 is detachably fixed to the reinforcing panel 6 when a predetermined load is applied to the striker 30. When a rear-end collision of the vehicle occurs at a position lower than the lower end BE of the tailgate 2, a force acts via the striker 30 to move the lower end BE of the tailgate 2 forward. In this case, as the striker 30 and the inner panel 2b of the tailgate 2 move forward, the attachment member 40 separates from the reinforcing panel 6. Therefore, the striker 30 is allowed to move forward accompanied by deformation of the inner panel 2b of the tailgate 2, and the engagement between the lock 20 and the striker 30 is released, preventing the tailgate 2 from opening.

[0031] (2) The mounting member 40 is fixed to the reinforcing panel 6 by an adhesive sheet 42 .

[0032] Because the mounting member 40 is fixed by the adhesive sheet 42, the force that separates the mounting member 40 from the reinforcing panel 6 can be minimized due to the properties of the adhesive used in the adhesive sheet 42. Also, by appropriately setting the adhesive area, etc. of the adhesive sheet 42, it is easy to adjust the force that separates the mounting member 40 from the reinforcing panel 6. Furthermore, joining (bonding) the mounting member 40 and the reinforcing panel 6 with the adhesive sheet 42 has the advantage that the joining work is easier than welding, etc.

[0033] Although the embodiments of the present invention have been described above, the descriptions and drawings that form part of this disclosure should not be understood to limit the present invention. Various alternative embodiments, examples, and operating techniques will become apparent to those skilled in the art from this disclosure. [Explanation of symbols]

[0034] 1. Body 2. Backdoor 2a Outer panel 2b Inner panel 6 Reinforcement Panel 10 Back door lock structure 20. Rock 30 Striker 40 Mounting material 42 adhesive sheet

Claims

1. a back door provided with a first locking member that is one of a lock and a striker that are engageable with each other; a vehicle body provided with a second locking member that is the other of the lock and the striker, The back door is Inner panel and An outer panel, a reinforcing panel provided between the inner panel and the outer panel; an attachment member that is disposed on a surface of the inner panel facing the reinforcing panel and is coupled to the inner panel together with the first locking member, The mounting member is detachably fixed to the reinforcing panel by application of a predetermined load to the first locking member. Back door lock structure.

2. The mounting member is fixed to the reinforcing panel by an adhesive sheet. The back door lock structure according to claim 1.

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