JP4388527B2 - Vehicle rear door structure - Google Patents

Description

  The present invention relates to a flip-up type rear door structure for a vehicle that is lightweight and capable of increasing rigidity.

  The flip-up door attached to the tailgate at the rear of the vehicle is usually attached to the vehicle by a hinge structure. This flip-up type door is structured to open and close by rotating around the hinge at the upper end. Such a rear door needs to have high rigidity in order to improve the collision strength and to prevent a squeak noise when traveling on a rough road. On the other hand, the flip-up rear door must be lightweight due to demands for improved fuel economy and easy opening and closing of the vehicle. For this reason, the conventional flip-up type rear door attached to a vehicle often has a structure in which two thin plate panels of an outer panel and an inner panel provided with an opening are combined and reinforced with those shapes.

FIG. 7 is a perspective view showing an example of an inner panel constituting a conventional flip-up type rear door structure. In the inner panel 2c of this example, a frame portion 4c is formed along the outer shape of the rear door. A window frame portion 5c is formed on the upper portion of the frame portion 4c, and an opening 8c in which the window glass is disposed is provided. In order to reduce the weight, an opening 9c is provided in the lower portion of the inner panel 2c. In the inner panel 2c, a transverse beam 6c that partitions these two openings 8c and 9c is formed. The transverse beam 6c is formed by press-molding integrally with the frame portion 4c, and is a portion for increasing the rigidity of the inner panel 2c against bending in the transverse direction. The examples disclosed in Patent Document 1 and Patent Document 2 also reinforce the opening portion of the inner panel provided for weight reduction with a beam, reinforcement, or the like, similar to the above example.
Japanese Patent No. 3013921 Japanese National Patent Publication No. 11-514613

  However, since the transverse beam 6c for reinforcing the inner panel 2c used in the conventional flip-up type rear door structure is integrally formed when the inner panel 2c is press-molded, there are the following problems.

  First, when the transverse beam 6c is integrally formed as in the inner panel 2c shown in FIG. 7, due to the press formability, the openings 8c and 9c of the inner panel 2c are not used unless a highly ductile panel material is used. It is a problem that it is difficult to form the cut and raised wall 11c formed at the outer edge sufficiently high. For this reason, there is a limit to increasing the rigidity of the inner panel 2c.

  One is a problem that the corner portion 12c where the transverse beam 6c and the frame portion 4c of the inner panel 2c are coupled needs to increase R beyond a certain level, and the opening portion 8c for the rear window glass becomes smaller. . For this reason, the rear view of the vehicle is narrowed.

  One problem is that it is difficult to increase the rigidity against bending of the inner panel 2c in the tangential direction of the rotating circumference of the flip-up rear door, in order to suppress the vibration of the door when closing the flip-up rear door. It is. When closing the flip-up rear door, the rear door receives a force in the tangential direction of its rotating circumference. Therefore, if the cut-and-raised wall 11c of the horizontal beam 6c is parallel to the tangential direction of the circumference of the flip-up rear door, the vibration of the flip-up rear door is effectively suppressed. However, the inclination of the wall surface of the cut-and-raised wall 11c of the transverse beam 6c is determined by the press-molding direction of the inner panel 2c, and thus is not effective as described above. Therefore, it is difficult to suppress door vibration when closing the flip-up type rear door.

  Another problem is that the panel thickness of the transverse beam 6c cannot be changed in the case of the above-described integral molding. For example, the design change such as making the panel thickness of the transverse beam 6c thinner than the frame portion 4c for weight reduction cannot be performed.

  The present invention solves the above-mentioned conventional problems, and provides a structure of a rear door of a vehicle that is lightweight, can effectively increase rigidity, and can improve a rear view. With the goal.

In order to solve the above problems, the invention according to claim 1 is a rear door structure of a vehicle having an inner panel on the vehicle inner side and an outer panel on the outer side of the vehicle, wherein the inner panel is formed by press molding, It has a frame part shaped along the outer shape of the rear door, a window frame part to which a window glass is attached is formed on the upper part of the frame part, and both lower corners of the window frame part A separate transverse beam is attached between the two, the transverse beam is formed by press molding in a different pressing direction from the inner panel, and the pressing direction is centered on the hinge of the rear door. It is a direction substantially parallel to the tangential direction of the rotating circle . According to the invention of the first aspect, in the rear door structure, the inner panel and the lateral beam joined thereto can be separately molded. Therefore, it is possible to increase the degree of freedom of press molding of the inner panel and the transverse beam, and it is possible to obtain a desired shape for increasing the rigidity of the rear door structure for each member.

In order to solve the above-mentioned problem, the invention according to claim 2 is characterized in that the transverse beam is attached at both lower corners of the window frame so as to be substantially perpendicular to the frame of the inner panel. It is characterized by. According to invention of Claim 2 , the lower corner part of the window frame part of an inner panel can be expanded. As a result, the field of view at the lower corner of the window glass can be improved.

In order to solve the above problem, the invention according to claim 3 is characterized in that the inner panel and the lateral beam have different cross-sectional widths in the inner and outer directions of the rear door. According to the invention described in claim 3 , the frame portion of the inner panel can be set deeply in the inner and outer directions of the rear door regardless of the press formability of the transverse beam. As a result, the rigidity of the rear door structure can be increased.

In order to solve the above problem, the invention according to claim 4 is characterized in that the transverse beam and the inner panel have different plate thicknesses. According to the invention described in claim 4 , it is possible to reduce the thickness of the lateral beam and reduce the weight of the rear door structure.

In order to solve the above problem, the invention according to claim 5 is characterized in that the inner panel and the transverse beam are made of different materials. According to the fifth aspect of the present invention, the rear door structure can be reduced in weight by forming the transverse beam of aluminum alloy or the like.

  According to the rear door structure of the vehicle according to the present invention, the press formability of the inner panel can be improved and the degree of freedom in shape can be increased without using a highly ductile panel material. As a result, the rigidity of the inner panel can be increased. Moreover, the rear part of the vehicle can be widened by making the opening for the rear window glass larger than before. In addition, the direction of press forming of the reinforcing transverse beam can be set to an optimum direction in order to increase the rigidity of the inner panel necessary for suppressing vibration when the rear door is closed. Further, it is possible to change the plate thickness of the transverse beam for the purpose of reducing the weight.

  The best mode for carrying out the present invention will be described. First, the configuration of the present embodiment will be described with reference to FIGS.

  FIG. 1 is a schematic view of a vehicle to which a rear door structure of this embodiment is attached as viewed from the rear. The rear door structure 1a of the present embodiment includes an inner panel 2a and an outer panel 3. The rear door structure 1 a is attached to the vehicle V by a hinge 14. The inner panel 2a and the outer panel 3 are combined by hemming or spot welding. The inner panel 2a is formed with a frame portion 4a along the outer shape of the rear door structure 1a. A window frame portion 5a to which the window glass 7 is attached is formed on the frame portion 4a, and a lateral beam 6a is attached to the frame portion 4a. A lock attachment portion 10 is formed at the lower end of the frame portion 4a.

  FIG. 2 is a perspective view of an inner panel used in the rear door structure of the present embodiment. A window frame portion 5a is formed on the upper portion of the frame portion 4a constituting the inner panel 2a. The frame portion 4a is formed by press molding. A separate lateral beam 6a is attached to the welded portions 13, 13 on the pair of window frame portions 5a located at the lower end of the window frame portion 5a by spot welding from the outside of the vehicle. As a result, the transverse beam 6a is attached over the opening between the pair of welds 13 and 13. In the present embodiment, the lateral beam 6a is attached from the outside of the vehicle so as to increase the strength against impact when closing the rear door, but from the inside of the vehicle to the welded portions 13, 13 on the window frame portion 5a side. It may be attached.

  An opening 8a to which a window glass is attached is provided in the upper part of the horizontal beam 6a. In addition, an opening 9a is provided at the bottom of the horizontal beam 6a. A cut-and-raised wall 11a is formed at the outer edge of these openings 8a and 9a. The cut-and-raised wall 11a has an effect of increasing rigidity against bending of the inner panel 2a.

  FIG. 3A is a perspective view of a separate transverse beam 6a used in the present embodiment. FIG. 3B is a CC cross-sectional view of the central portion of the transverse beam 6a used in the present embodiment. The transverse beam 6a is a member that is molded separately from the frame portion 4a of the inner panel 2a by press molding (see FIGS. 1 and 2). The transverse beam 6a has a pair of welding portions 23, 23 on the side of the transverse beam 6a formed at both ends. The pair of welded portions 23 and 23 are on the same plane and are spot-welded to the window frame portion 5a formed on the frame portion 4a constituting the inner panel 2a as described above (see FIG. 2).

  A portion sandwiched between the welded portions 23 is a beam portion 21. The beam portion 21 is formed with a pair of cut and raised portions 22. The cut-and-raised part 22 is provided in order to increase the rigidity against bending in the lateral direction of the inner panel 2a.

The height of the cut-and-raised portion 22 increases from both ends of the beam portion 21 to the center portion. It has a maximum height L ₃ at the central portion. Therefore, the cross-sectional area of the transverse beam 6a is an arch shape having a maximum at the center and a minimum at both ends of the beam portion 21. By doing so, the bending stress applied to the transverse beam 6a is made uniform in the transverse beam 6a.

Further, since the transverse beam 6a is formed separately from the frame portion 4a, the degree of freedom in shape is higher than that of the transverse beam 6c of the conventional example (see FIG. 7). For example, the maximum height L ₃ of the cut-and-raised portions 22 of the transverse beam 6a is to be higher than the cut and raised wall 11c of the horizontal beam 6c in the conventional example can be easily. Further, if the height of the cut-and-raised part 22 is increased as a whole, even when the transverse beam 6a is formed by press molding with a panel material thinner than the frame part 4a, the rigidity against bending of the transverse beam 6a is kept equal. Is possible.

  Further, since the transverse beam 6a is press-molded separately and has good press formability, it is relatively easy to form holes in the bottom 24 and the upper curved portion 25 of the beam portion 21 for weight reduction. A hole for attaching a wiper motor or the like may be formed in the upper curved portion 25 of the transverse beam 6a. However, since the press formability is good, it is possible to make a hole in any part. For example, since a wiper motor or the like is attached to the transverse beam 6a, a fixing weld nut or the like can be welded to the upper curved portion 25 of the transverse beam 6a in advance.

  In the transverse beam 6a of the inner panel 2a used in the rear door structure 1a (see FIG. 1) of the present embodiment, the direction of press molding when forming the transverse beam 6a (hereinafter referred to as “press direction”) is a pair of weldings. A certain angle α is formed with the direction perpendicular to the surface of the portion 23. As can be seen from FIG. 3 (b), the pressing direction of the transverse beam 6 a forms an angle α with the vertical direction of the surface of the welded portion 23. Therefore, the surface of the cut and raised portion 22 formed by press molding is not perpendicular to the surfaces of the pair of welded portions 23. When the rear door structure 1a including the inner panel 2a is attached to the vehicle V, the rear door structure 1a rotates around the hinge 14 to which the rear door structure 1a is attached. At this time, the pressing direction forms an angle α with respect to the vertical direction of the surfaces of the pair of welded portions 23 so that the surface of the cut and raised portion 22 is parallel to the tangential direction of the rotation circle of the rear door 1. It is.

  FIG. 4 is a view in the direction of the arrow A (see FIG. 2) of the inner panel 2a used in the present embodiment. As shown in FIG. 3B, the angle α between the pressing direction of the transverse beam 6a and the vertical direction of the surfaces of the pair of welded portions 23, 23 is the surface of the pair of welded portions 23, 23 and the center of the transverse beam 6a. This corresponds to the angle formed by the line l connecting the hinges 14. By this correspondence, the pressing direction of the transverse beam 6a is parallel to the tangential direction of the rotation circle of the rear door around the hinge 14 of the inner panel 2a.

  When the rear door is closed, the rear door structure 1a receives a force in the tangential direction of the rotation circle (see FIGS. 1 and 3). As a result, vibration is generated in the rear door structure 1a. However, as described above, by making the pressing direction of the transverse beam 6a parallel to the tangential direction of the rotating circle of the rear door structure 1a, the cut-and-raised portion 22 of the transverse beam 6a that is parallel to the tangential direction of the rotating circle described above. The vibration can be effectively suppressed by the rigidity (see FIG. 3).

  In the inner panel 2c of the conventional example shown in FIG. 7, the horizontal beam 6c is press-molded integrally with the frame portion 4c, so the pressing direction of the frame portion 4c and the horizontal beam 6c is always the same. However, the pressing direction of the transverse beam 6a of this embodiment does not coincide with the pressing direction of the inner panel 2a (see FIG. 4). In the present invention, the transverse beam 6a is separate from the inner panel 2a, so the pressing direction of both members can be determined independently.

  Since the horizontal beam 6a is separate from the frame 4a of the inner panel 2a, the thickness of the panel of the horizontal beam 6a may be different from that of the frame 4a for the purpose of reducing the weight as described above. it can. Further, the material of the transverse beam 6a can be different from that of the frame portion 4a.

  The corner portion 12a (see FIG. 2) where the transverse beam 6a of the inner panel 2a and the window frame portion 5a are welded will be described in comparison with the corner portion 12c of the inner panel 2c of the conventional example shown in FIG. Fig.5 (a) is an enlarged view of the B section of FIG. 2 with which the transverse beam of the inner panel of this embodiment is welded. FIG.5 (b) is an enlarged view of the D section of FIG. 7 to which the transverse beam of the inner panel of the comparative example shown in FIG. 7 is welded. As can be seen from FIG. 5A, in the case of the inner panel 2a of the present embodiment, the transverse beam 6a is attached substantially at right angles to the window frame portion 5a. On the other hand, in the case of the inner panel 2c of the comparative example of FIG. 5B, the lateral beam 6c is press-molded integrally with the window frame portion 5c, so that the corner portion 12c has a certain level or more to ensure press-formability. It is necessary to provide R. As a result, the window glass opening 8c of the inner panel 2c is smaller than the opening 8a of the inner panel 2a of the present embodiment.

In the case of the inner panel 2a used in the rear door structure 1a of the present embodiment, since the horizontal beam 6a is a separate body, the height L ₁ of the cut-and-raised wall 11a of the inner panel 2a (see FIGS. 5A and 2) is It is determined independently of the maximum height L ₃ of the cut-and-raised portions 22 of the transverse beam 6a (see FIG. 3). On the other hand, in the case of the comparative example (refer to FIG. 5 (b) and FIG. 7), there is a limit to the press-formability because the horizontal beam 6c is integrally molded, the height L ₂ of the cut-and-raised wall 11c is a frame portion 4c and Both the transverse beams 6c are limited by press molding and are below a certain limit height Lc (not shown).

In the case of the inner panel 2a, since the transverse beam 6a is separate from the frame portion 4a, the press formability is better than that of the inner panel 2c of the conventional example. Therefore, it can be made higher than the limit height Lc of the cut and raised relatively easily the height L ₁ of the cut and raised wall 11a walls 11c. Therefore, if necessary, by increasing the height L ₁ of the cut-and-raised walls 11a, i.e., to increase the mediolateral section width of the rear door structure 1a, the rigidity of the frame portion 4a constituting the inner panel 2a Can be increased.

  Next, the effect is demonstrated based on the structure of the rear door structure 1a of this embodiment described above.

  In the case of the rear door 1a structure of the present embodiment, the pressing direction of the transverse beam 6a of the inner panel 2a can be determined independently of the pressing direction of the inner panel 2a. Therefore, as described above, by selecting the pressing direction of the transverse beam 6a, it is possible to effectively suppress the vibration of the door when closing the rear door, as compared with the conventional example.

  In the case of the inner panel 2a used in the rear door structure 1a of the present embodiment, since the transverse beam 6a is attached separately, the press formability of the inner panel 2a is improved as compared with the conventional example. Therefore, the height of the cut and raised wall 11a of the frame portion 4a of the inner panel 2a can be made higher than the height of the cut and raised wall 11c of the inner panel 2c of the conventional example. Thereby, the rigidity of the inner panel 2a can be increased.

  In the case of the inner panel 2a used in the rear door structure 1a of this embodiment, as shown in FIG. 5A, the horizontal beam 6a is joined to the window frame portion 5a of the frame portion 4a at a substantially right angle as described above. Therefore, as compared with the conventional example in which the transverse beam 6c shown in FIG. 7 is integrally formed with the window frame portion 5c of the frame portion 4c, the window glass opening 8a is enlarged and the rear view is improved.

  In the case of the inner panel 2a used in the rear door structure 1a of the present embodiment, the lateral beam 6a is separate from the frame 4a (see FIG. 2), so that the shape of the inner beam 2a is changed to effectively improve the rigidity of the inner panel 2a. Can be increased. Further, if necessary, the thickness of the lateral beam 6a can be made thinner or thicker than that of the frame portion 4a to achieve the purpose of reducing the weight or improving the rigidity of the inner panel 2a. Further, the material of the transverse beam 6a can be changed to that of the frame portion 4a. For example, the transverse beam 6a can be made of an aluminum alloy for the purpose of weight reduction.

  Further, since the transverse beam 6a is a separate body of the frame portion 4a, the panel material of the window opening portion punched out by press molding of the frame portion 4a is relatively large. Therefore, other parts can be manufactured using the panel material punched out by the press.

  In the case of the rear door structure 1a of the present embodiment, small parts such as nuts can be assembled in advance to the separate transverse beam 6a. For example, a weld nut for attaching a wiper motor can be welded to the transverse beam 6a in advance. In this way, the number of parts welded to the panel can be reduced, and the welding process can be simplified.

  The embodiment of the present invention is not limited to the embodiment described above. It is possible to change the embodiment of each constituent element without departing from the spirit of the present invention. For example, the pressing direction of the transverse beam 6a shown in FIG. 4 does not have to be completely parallel to the tangential direction of the rear door rotation circle. Moreover, what changed the frame part 4a of the inner panel 2a as follows is also contained in the technical scope of this invention.

  FIG. 6 is a perspective view of an inner panel reinforced by a V-shaped reinforcing frame used in another embodiment of the present invention. In this embodiment, the upper part of the frame part 4b of the inner panel 2b is the same as the frame part 4a of the inner panel 2a of FIG. However, V-shaped reinforcing frame portions 15 are provided from both lower corners of the window frame portion 5b provided in the frame portion 4b to the lock mounting portion 10, and openings 16a on both sides of the V-shaped reinforcing frame portion 15 are provided. 16b is provided.

  In the rear door structure using the inner panel 2b shown in FIG. 6, since the separate transverse beam 6b is joined, as described above, the press formability of the frame portion 4b is good. Therefore, the inner panel 2b has sufficient rigidity by the V-shaped reinforcing frame portion 15 in which the height of the cut and raised wall 11b is increased. Therefore, the rear door structure using the inner panel 2b shown in FIG. 6 has all the effects of the rear door structure 1a described above, but the weight of the rear door structure is particularly reduced by the action of the openings 16a and 16b. It is more effective.

It is the schematic which looked at the vehicle with which the rear door structure of this embodiment was attached from back. It is a perspective view of the inner panel used for the rear door structure of this embodiment. (A) And (b) is a CC sectional view of a central part and a perspective view of a separate transverse beam used in this embodiment, respectively. It is an A direction arrow directional view in FIG. 2 of the inner panel used by this embodiment. (A) And (b) is an enlarged view of part B where the transverse beam of the inner panel of this embodiment is welded, and D where the transverse beam of the inner panel of the conventional example shown in FIG. 7 is welded. It is an enlarged view of a part. The perspective view of the inner panel reinforced with the V-shaped reinforcement frame used in other embodiment of this invention It is a perspective view which shows an example of the inner panel which comprises the conventional raising type rear door structure.

Explanation of symbols

1a Rear door structure 2a, 2b, 2c Inner panel 3 Outer panel 4a, 4b, 4c Frame part 5a, 5b, 4c Window frame part 6a, 6b, 6c Horizontal beam 11a, 11b, 11c Cut-and-raised wall 12a, 12c Corner part 13 Welding Part (window frame part)
14 Hinge 21 Beam part 22 Cut and raised part 23 Welded part (lateral beam)

Claims (7)

A vehicle rear door structure having an inner panel on the vehicle interior and an outer panel on the vehicle exterior,
The inner panel is formed by press molding and has a frame portion having a shape along the outer shape of the rear door;
A window frame part to which a window glass is attached is formed on the upper part of the frame part,
A separate transverse beam is attached between the lower corners of the window frame,
The transverse beam is formed by press molding in a different press direction from the inner panel;
The different pressing directions are directions substantially parallel to a tangential direction of a rotation circle around the hinge of the rear door; and
Comprising a cut-and-raised part formed with a surface substantially parallel to the different pressing directions;
The vehicle rear door structure according to claim 1. The transverse beam is attached at both lower corners of the window frame so as to be substantially perpendicular to the frame of the inner panel,
The vehicle rear door structure according to claim 1. The inner panel and the transverse beam have different cross-sectional widths in the inner and outer directions of the rear door;
The rear door structure of a vehicle according to any one of claims 1 and 2 . The transverse beam and the inner panel have different plate thicknesses;
The rear door structure of the vehicle according to any one of claims 1 to 3 . The inner panel and the transverse beam are different materials;
The rear door structure of a vehicle according to any one of claims 1 to 4 . Both end portions of the transverse beam are overlapped with the window frame portion to form a welded portion, and the cut and raised portion of the beam portion sandwiched between the pair of welded portions has a predetermined angle with the vertical direction of the surface of the welded portion. That it is press-molded in the press direction
The rear door structure of the vehicle according to any one of claims 1 to 5. The height of the surface of the cut and raised portion becomes higher from both ends of the beam portion toward the center of the beam portion, and becomes maximum at the center of the beam portion.
The rear door structure of a vehicle according to any one of claims 1 to 6 .

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