CN101008307A - Hatchback door structure for vehicles - Google Patents

Abstract

An object of the present invention is to provide a rear door structure for a vehicle, which can not only reduce the weight, but also has sufficient rigidity, and can also reduce the number of working steps in manufacturing and reduce the manufacturing cost. The rear door structure (1a) of the vehicle (V) of the present invention has an inner panel (6a) arranged on the vehicle inner side and an outer panel (5) arranged on the outer side of the vehicle, and the inner panel (6a) has: (2) A frame portion (9) in an external shape; a pair of reinforcing portions (10a) that are integrally formed with the frame portion (9) and extend in a substantially V-shape from the lower side of the frame portion (9) to both sides. , 10b).

Description

Vehicle rear door structure

technical field

The invention relates to a rear door structure of a vehicle, in particular to a lift-up rear door structure which is hinged and installed on the upper edge of the opening of the tailgate of the vehicle.

Background technique

Conventionally, as a lift-up rear door structure, there is known a structure provided with an inner panel integrally formed on a frame portion of the shape following the outer shape of the rear door to divide the frame portion up and down by a horizontal panel. frame portion (for example, refer to Patent Document 1).

Fig. 8 is a schematic diagram illustrating the configuration of a conventional rear door structure, viewed from the rear of the vehicle. As shown in FIG. 8 , the rear door structure 101 of the vehicle V includes an inner panel 106 composed of a frame portion 109 and a horizontal frame portion 118 , and on the upper side of the horizontal frame portion 118 , the frame portion 109 and the horizontal frame portion 118 are formed. The window glass 107 is attached to the divided opening 112a. Furthermore, a pair of connection reinforcing members 100 a is disposed on the opening 112 b defined by the frame portion 109 and the lateral frame portion 118 on the lower side of the lateral frame portion 118 . The lower end side of each connection reinforcement member 100a is welded to the frame portion 109 through the lock reinforcement member 100b installed at the center of the lower side of the frame portion 109, and each connection reinforcement member 100a faces to the upper two corners of the opening 112b in a V shape. extension. In addition, the upper end side of each connection reinforcement member 100a is welded to the frame portion 109 and the lateral frame portion 118 via the corner reinforcement members 100c attached to both upper corners of the opening 112b.

In the rear door structure 101 described above, the rigidity of the inner panel 106 is increased by arranging the pair of connecting reinforcement members 100a at the opening 112b.

(Patent Document 1: Japanese Patent Application Laid-Open No. 8-258568 (paragraphs 0010 to 0015, FIG. 1))

However, in this rear door structure 101, the separate joint reinforcement member 100a is installed on the frame portion 109 and the lateral frame portion 118 by welding, and the lock reinforcement member 100b and the corner reinforcement member 100c are required in the above-mentioned installation process. Such additional components. Therefore, the above-mentioned rear door structure 101 has the problems of high manufacturing cost and increased weight. In addition, since welding must be performed, there is also a problem that the number of working steps increases.

Also, a liftgate mounted on a tailgate at the rear of the vehicle is usually mounted on the vehicle through a hinge structure. The above-mentioned lift-up door is configured to be opened and closed by rotating the hinge at the upper end as a center. In order to increase the impact strength of the above-mentioned rear doors and avoid noise when driving in bad road conditions, it is necessary to increase their rigidity. On the other hand, the above-mentioned lift-up rear doors must also be light in weight due to the increase in vehicle fuel costs and the need for ease of opening and closing. Therefore, the structure of the lift-type rear door mounted on the conventional vehicle often employs a structure in which two thin plates, namely an outer panel and an inner panel provided with an opening, are combined and reinforced by their shapes.

Fig. 15 is a perspective view showing an example of an inner panel constituting a conventional tilt-up rear door structure. In the inner panel 202c in this example, a frame portion 204c is formed along the outer shape of the rear door. A window frame portion 205c is formed on an upper portion of the frame portion 204c, and an opening portion 208c in which a window glass is disposed is provided. In order to reduce the weight, an opening 209c is provided at the lower portion of the inner panel 202c. A beam 206c is formed on the inner panel 202c to partition the two openings 208c and 209c. The beam 206c is formed integrally with the frame portion 204c by press molding, and is a portion for increasing rigidity against bending of the inner panel 202c in the lateral direction. The examples disclosed in Patent Document 2 and Patent Document 3 are also similar to the above-mentioned examples, and the opening portion of the inner panel provided for weight reduction is reinforced with beams, reinforcing members, and the like.

(Patent Document 2: Japanese Patent No. 3013921)

(Patent Document 3: Japanese Patent Application Laid-Open No. 11-514613)

Contents of the invention

However, the reinforcing beam 206c of the inner panel 202c used in the conventional lift-up rear door structure has the following problems because it is integrally formed when the inner panel 202c is press-molded.

One problem is that in the case of integrally forming the beam 206c like the inner panel 202c shown in FIG. The problem is that the cut-out walls 211c of the outer edge portions of the openings 208c and 209c of the panel 202c are formed sufficiently high. Therefore, there is a limit to the improvement of the rigidity of the inner panel 202c.

Another problem is that the corner portion 212c where the cross member 206c and the frame portion 204c of the inner panel 202c are joined needs to have a certain increase in R, thereby reducing the size of the opening 208c for the rear window. Therefore, the rear view of the vehicle is narrowed.

Another problem is that it is difficult to increase the rigidity of the rear door relative to the bending of the inner panel 202c in the tangential direction of the rotation circle while suppressing the vibration of the door when the lift rear door is closed. When the lift-up rear door is closed, the rear door is acted upon by a force tangential to its circle of rotation. Therefore, if the cut-out wall 211c of the beam 206c is parallel to the tangential direction of the rotation circumference of the liftgate, the vibration of the liftgate can be effectively suppressed. However, since the inclination of the wall surface of the cut-out wall 211c of the beam 206c is determined by the orientation of the press-molded inner panel 202c, an effective orientation as described above cannot be formed. Therefore, it is difficult to suppress the vibration of the door when the lift rear door is closed.

Another problem is that, in the case of the integral molding described above, the plate thickness of the beam 206c cannot be changed. For example, design changes such as making the beam 206c thinner than the frame portion 204c in order to achieve weight reduction cannot be performed.

Therefore, the object of the present invention is to provide a rear door structure of a vehicle, which can achieve light weight and has sufficient rigidity, can reduce the working process and manufacturing cost during manufacturing, and can also increase the rear view. .

In order to solve the above-mentioned problems, the present invention provides a vehicle rear door structure having an inner panel disposed on the inner side of the vehicle and an outer panel disposed on the outer side of the vehicle, wherein the inner panel has an outer shape along the rear door A frame portion; a pair of reinforcing portions integrally formed with the frame portion and extending in a substantially V-shape from the lower side of the frame portion to both sides.

In the rear door structure described above, the inner panel is formed so that a pair of reinforcements extend in a substantially V shape from the lower side of the frame portion along the outer shape of the rear door toward both sides. That is, in the above-mentioned rear door structure, the frame portion and the reinforcement portion ensure that the inner panel has as large an opening as possible, thereby ensuring weight reduction and simultaneously improving rigidity.

In addition, in the above-mentioned rear door structure, since the frame portion and the reinforcing portion are integrally formed, unlike the conventional rear door structure (for example, refer to Patent Document 1), multiple reinforcing members are not required, so the light weight is achieved. At the same time, it also reduces the manufacturing cost.

In addition, the rear door structure described above does not require a plurality of reinforcing members unlike conventional rear door structures (for example, refer to Patent Document 1), so welding is not required, and manufacturing steps can be reduced.

In addition, in the rear door structure as described above, it is preferable that the inner panel has a surface that is formed smoothly and continuously from the side portion side of the frame portion to the reinforcement portion.

In the above-mentioned rear door structure, since there is no bent portion where stress concentration tends to occur from the side portion side of the frame portion to the reinforcement portion, and the face is formed smoothly and continuously, the rigidity can be further increased.

In addition, in the rear door structure as described above, the pair of reinforcing parts may be formed on the lower side of the frame part and extend in a substantially V shape from the lock part on which the lock mechanism is mounted to both side parts.

In the rear door structure described above, since the reinforcing portion extends from the lock portion in a substantially V-shape, its rigidity is further increased.

Furthermore, in the rear door structure as described above, the inner panel is integrally formed with a cut-and-raised portion protruding toward the outer panel, and the cut-and-raised portion is connected to the outer panel.

In the above-mentioned rear door structure, since the raised portion formed on the inner panel is connected to the outer panel, its rigidity can be further increased. In addition, since the cut-and-raised portion is formed when it is integrally formed, the rear door structure can easily form the cut-and-raised portion having an optimum shape at a desired position.

In addition, in the rear door structure as described above, it is preferable to form: a first opening part defined by the reinforcement parts and the frame part on the upper side of the reinforcement part; On the side, a second opening defined by the reinforcement and the frame; on the lower side of the other reinforcement, a third opening defined by the reinforcement and the frame.

In this rear door structure, by forming the first opening, the second opening, and the third opening in the inner panel, an opening as large as possible can be formed in the inner panel over a wide range. In this way, the rear door structure can be reduced in weight while exhibiting rigidity.

In addition, in the rear door structure as described above, the inner panel may be further provided with an integral beam attached so as to extend across the connection between the side portion of the frame portion and the connecting portion of the reinforcement portion, Formed in one piece by stamping.

In this rear door structure, the rigidity is further improved by attaching the beam so as to extend across the connection between the frame portion and the reinforcement portion. In addition, since the beam is integrally formed together with the frame portion and the reinforcement portion, the manufacturing process of the rear door structure (inner panel) is simplified.

In addition, in the rear door structure as described above, it is preferable that the inner panel is integrally formed by press molding, and further includes a separate cross member that bridges the side portion of the frame portion and connects the reinforcement portion. installed in such a way that the parts extend from each other.

In this rear door structure, by providing the beam integrally with the frame portion and the reinforcing portion, the press forming of the inner panel can be easily performed, and by increasing the degree of freedom of the press forming, it is possible to secure a larger shape on the inner panel. Open your mouth.

In addition, in the above-mentioned rear door structure, it is preferable that the above-mentioned cross member is curved and formed to protrude toward the outside of the vehicle in an arc shape, and the size of the cross-sectional shape gradually decreases from the center to both ends. Small.

In this rear door structure, the cross member is curved and formed to protrude toward the outer side of the vehicle in an arc shape, and is formed to be curved along the outer surface of the rear door. Furthermore, when a heavy object such as a wiper motor is attached to the central portion of the beam, a large stress is generated in the central portion. In the above-mentioned rear door structure, even if the size of the cross-sectional shape of the central portion is increased in order to enable the central portion of the beam to support an object with a certain weight, since the size of the cross-sectional shape of the beam increases from the central portion to both ends, Gradually smaller, so it can achieve its light weight.

In addition, in the rear door structure as described above, it is preferable to arrange the cross member so that the extending direction substantially perpendicular to the extending direction thereof is along the opening and closing direction of the rear door.

In the rear door structure described above, particularly when the rear door is closed, sufficient rigidity can be exhibited against the load applied to the cross member.

In addition, in the rear door structure as described above, it is preferable that each attachment portion of the cross member on each of the connection portions is arranged on the same plane defined in the vehicle width direction.

In the rear door structure described above, especially when the rear door is closed, since the beam can uniformly transmit the applied load to each mounting portion, the load of the beam mounting portion can be uniformly distributed.

In addition, in the rear door structure described above, since the cross member is installed on the same plane, it is easy to align with the connecting portion, thereby improving the installation workability of the cross member.

In order to solve the above-mentioned problems, the invention described in claim 11 is a vehicle rear door structure, which has an inner panel on the inner side of the vehicle and an outer panel on the outer side of the vehicle, the inner panel is formed by press forming, and has a The frame portion of the external shape of the vehicle door is characterized in that: a window frame portion for mounting a window glass is formed on the upper portion of the frame portion;

According to the invention described in claim 11, in the rear door structure, the inner panel and the beam joined thereto can be formed separately. Therefore, each component can be made into a desired shape that can enhance the structural rigidity of the rear door.

In order to solve the above problems, the invention according to claim 12 is characterized in that: the beam is formed by press forming; and the inner panel and the beam are formed in different press directions. According to the invention described in claim 12, the degree of freedom of press forming of the inner panel and the beam can be increased.

In order to solve the above-mentioned problems, the invention according to claim 13 is characterized in that the beams are attached to the lower corners of the window frame so as to be substantially at right angles to the frame of the inner panel. According to the invention described in claim 13, the lower corner of the inner panel window frame can be enlarged. In this way, the visibility at the lower corners of the window pane is improved.

In order to solve the above-mentioned problems, the invention according to claim 14 is characterized in that the inner panel and the beam have different cross-sectional widths in the inner-outer direction of the rear door. According to the invention described in claim 14, the inner panel frame portion can be set deeper in the inner-outer direction of the rear door regardless of the press formability of the beam. In this way, the rigidity of the rear door structure can be increased.

In order to solve the above-mentioned problems, the invention according to claim 15 is characterized in that the beam and the inner panel have different plate thicknesses. According to the invention described in claim 15, since the plate thickness of the beam is reduced, the weight of the rear door structure can be reduced.

In order to solve the above-mentioned problems, the invention according to claim 16 is characterized in that the materials of the inner panel and the beam are different. According to the invention described in claim 16, the beam is formed of aluminum alloy or the like, and the weight of the rear door structure can be reduced.

The vehicle rear door structure of the present invention can achieve sufficient rigidity while achieving light weight, and can also reduce working procedures and reduce manufacturing costs.

According to the vehicle rear door structure of the present invention, the press formability of the inner panel can be improved without using a highly ductile sheet material, and the degree of freedom of its shape can also be increased. In this way, the rigidity of the inner panel can be increased. In addition, since the opening for the rear window is larger than in the prior art, rearward visibility of the vehicle can also be improved. In addition, in addition to increasing the rigidity of the inner panel necessary to suppress the vibration when the rear door is closed, it is also possible to make the direction of the press forming of the reinforcing cross member an optimum direction. In addition, for the purpose of reducing weight, etc., the plate thickness of the beam can also be changed.

Description of drawings

FIG. 1 is a partial perspective view of a vehicle to which a rear door structure according to a first embodiment is applied.

2 is a perspective view showing a state of an inner panel constituting the rear door structure of the first embodiment, viewed from the outside of the vehicle.

3 is a partial perspective view showing a state from a side portion of an inner panel frame portion to a reinforcement portion as viewed from the inside of the vehicle, and is a view showing a portion indicated by an arrow C in FIG. 2 .

4 is a perspective view showing a state of an inner panel constituting a rear door structure according to a second embodiment, viewed from the outside of the vehicle.

Fig. 5 is an X-X sectional view of Fig. 4 .

Fig. 6 is a side view of an inner panel in the second embodiment.

7 is a perspective view showing a state of an inner panel constituting a rear door structure according to another embodiment, viewed from the outside of the vehicle.

Fig. 8 is a schematic diagram illustrating the configuration of a conventional rear door structure, viewed from the rear side of the vehicle.

9 is a schematic view of a vehicle to which a rear door structure according to a fourth embodiment of the present invention is mounted, viewed from the rear.

Fig. 10 is a perspective view of an inner panel employed in the rear door structure of the fourth embodiment.

Fig. 11(a) and Fig. 11(b) are a perspective view and a C-C cross-sectional view of a central part of a single beam used in the fourth embodiment, respectively.

Fig. 12 is a view in the direction of arrow A in Fig. 10 of the inner panel used in the fourth embodiment.

Fig. 13(a) is an enlarged view of part B where the beams of the inner panel are welded in the fourth embodiment, and Fig. 13(b) is an enlarged view of part D where the beams of the inner panel of the conventional example shown in Fig. 15 are welded .

Fig. 14 is a perspective view of an inner panel reinforced with a V-shaped reinforcing frame used in a fifth embodiment of the present invention.

Fig. 15 is a perspective view showing an example of an inner panel constituting a conventional tilt-up rear door structure.

reference sign

1a Rear door structure

1b rear door structure

1c rear door structure

2 rear doors

5 outer panels

6a Inner panel

6b inner panel

9 Frame

10a Reinforcement

10b Reinforcement

12 The first opening

13 The second opening

14 The third opening

16 curved face

17 Connection part

18 Beam

19 Beam installation part

V Vehicle

210a Rear door structure

202a, 202b, 202c inner panel

203 Outer panel

204a, 204b, 204c Frame

205a, 205b, 205c window frame

206a, 206b, 206c Beam

211a, 211b, 211c cut the wall

212a, 212c Corner

213 Welding part (window frame part)

214 hinge

221 beam part

222 cut up part

223 Welding part (beam)

Detailed ways

(first embodiment)

Next, a vehicle rear door structure according to a first embodiment of the present invention will be described in detail with reference to appropriate drawings. Of the drawings referred to, FIG. 1 is a partial perspective view of a vehicle to which a rear door structure according to a first embodiment is applied. 2 is a perspective view showing a state of an inner panel constituting the rear door structure of the first embodiment, viewed from the outside of the vehicle. 3 is a partial perspective view showing a state from a side portion of an inner panel frame portion to a reinforcement portion as viewed from the inside of the vehicle, and is a view showing a portion indicated by an arrow C in FIG. 2 .

As shown in FIG. 1, the rear door structure 1a is applied to the rear door 2 which opens and closes the tailgate opening part 3 of the vehicle V. As shown in FIG. Incidentally, the rear door 2 has a lift-up structure, that is, its upper edge and the upper edge of the tailgate opening 3 are connected by a pair of hinges 4, 4, and rotate around the hinges 4, 4. . Furthermore, at the center of the lower part of the rear door 2, a lock device (not shown) is disposed, and the lock device can lock the rear door 2 in the closed position to the vehicle body side.

The rear door structure 1 a includes: an outer panel 5 arranged on the vehicle outer side of the rear door 2 to form an outer surface; and an inner panel 6 a arranged on the vehicle inner side of the outer panel 5 . In addition, the rear door structure 1 a further includes: a window portion 7 formed by fitting a glass plate into the upper side of the rear door 2 ; and a wiper 8 arranged under the window portion 7 .

As shown in FIG. 1, the inner panel 6a is provided with: a frame portion 9 following the outer shape of the rear door 2; , sometimes simply referred to as "reinforcing portion 10").

As shown in FIG. 2 , the frame portion 9 of this embodiment is obtained by stamping a metal plate, and its outer contour is approximately rectangular, and an approximately rectangular opening in plan view is formed inside the frame portion 9 .

And, at the center of the lower portion of the frame portion 9, a lock mounting portion 11 to which the above-mentioned lock device (not shown) is mounted is formed.

As shown in FIG. 2 , the reinforcing parts 10 a and 10 b extend in a substantially V-shape from the lower part of the frame part 9 , specifically, from the lock mounting part 11 side to both side parts of the frame part 9 . Incidentally, in the present embodiment, the positions of both sides of the frame portion 9 to which the reinforcing portions 10a, 10b are connected correspond to the two corners located below the window portion 7 (see FIG. 1 ).

Moreover, the reinforcement parts 10a, 10b are formed by partitioning the opening formed inside the frame part 9: a first section that is located above the reinforcement parts 10a, 10b and is divided between the reinforcement parts 10a, 10b and the frame part 9. The opening 12; the second opening 13 located on the lower side of one reinforcing part 10a and divided by the reinforcing part 10a and the frame part 9; located on the lower side of the other reinforcing part 10b and divided by the reinforcing part 10b and the frame part 9 The third opening 14. Incidentally, in the present embodiment, the first opening 12 has a pentagonal shape in plan view, and the second opening 13 and the third opening 14 have a triangular shape.

As shown in FIG. 2 , such an inner panel 6 a has a plurality of cut-and-raised portions 15 on the sides of the first opening 12 , the second opening 13 , and the third opening 14 . The cut-and-raised portion 15 is formed to protrude in a direction toward the outer panel 5 (see FIG. 1 ), that is, in a direction D toward the vehicle outer side. Such cut-and-raised portions 15 are formed standing up from the frame portion 9 and the reinforcing portions 10 a and 10 b on the side of the first opening 12 so as to surround the first opening 12 . Furthermore, the cut-and-raised portion 15 on the side of the second opening 13 and the third opening 14 is also formed so as to stand up from the frame portion 9 . Front ends of these cut-and-raised portions 15 are connected to the outer panel 5 (refer to FIG. 1 ).

Moreover, as shown in FIG. 3, such an inner panel 6a has the curved surface part 16 formed smoothly continuously from the side part side of the frame part 9 toward the reinforcement part 10a. The curved surface 16 corresponds to the "face" in the claims. In addition, although not shown in figure, the curved surface part formed smoothly and continuously from the side part of the frame part 9 toward the reinforcement part 10b shown in FIG. 2 is formed similarly to the curved surface part 16 shown in FIG.

Incidentally, the inner panel 6a in the rear door structure 1a of the present embodiment is also used as the inner panel 6a in the rear door structure 1b (see FIG. 4 ) of the second embodiment described later, and is formed with a cross member 18 to be attached to it. (Refer to FIG. 4 ) beam mounting portion 19. Moreover, this beam attachment part 19 corresponds to the "attachment part of a beam" mentioned in a claim. As shown in FIG. 3 , the beam mounting portion 19 is formed at the connection portion 17 between the frame portion 9 and the reinforcement portion 10 , specifically, it starts from the edge of the curved portion 16 on the D side (vehicle outer side) to the first side. The opening 12 is formed so that its sides stand up.

Next, technical effects of the rear door structure 1a of the present embodiment will be described.

As described above, in the rear door structure 1a, the pair of reinforcement parts 10a and 10b are formed to extend in a substantially V shape from the lower side of the frame part 9 along the outer shape of the rear door 2 toward the side parts. The inner panel 6a is formed on the inner panel 6a, and an opening consisting of a first opening 12, a second opening 13, and a third opening 14 is formed on the inner panel 6a (see FIG. 1). That is, in the rear door structure 1a, a very large opening is ensured in the inner panel 6a by the frame portion 9 and the reinforcement portions 10a, 10b to achieve weight reduction and increase rigidity.

In addition, in this rear door structure 1a, since the frame portion 9 and the reinforcement portions 10a, 10b are integrally formed by press molding or the like, unlike the conventional rear door structure 101 (refer to FIG. 7 ), multiple The member is reinforced, so not only can the weight be reduced, but also the manufacturing cost can be reduced.

In addition, in this rear door structure 1a, unlike the conventional rear door structure 101 (refer to FIG. 7 ), since a plurality of reinforcement members are not required, welding is not required, thereby reducing the number of work steps during manufacture.

In addition, in this rear door structure 1a, since there is no bent portion where stress tends to concentrate from the side portion side of the frame portion 9 to the reinforcement portions 10a, 10b, a smoothly and continuously formed curved portion 16 is formed (refer to FIG. 3), so the rigidity can be further improved.

In addition, in this rear door structure 1a, since the cut-and-raised portions 15 of the inner panel 6a formed in the first opening 12, the second opening 13, and the third opening 14 are connected to the outer panel 5 (see FIG. 1 ), , Therefore, an opening as large as possible is ensured on the inner panel 6a to reduce weight and further increase rigidity. In addition, since the cut-and-raised portion 15 is cut from the side of the first opening 12, the second opening 13, and the third opening 14, in the rear door structure 1a, the first opening 12, the second opening can be formed. The cut-and-raised portion 15 is formed at the same time as the two openings 13 and the third opening 14, and the cut-and-raised portion 15 having an optimum shape can be easily formed at a desired position.

(second embodiment)

Next, a vehicle rear door structure according to a second embodiment of the present invention will be described in detail with reference to appropriate drawings. Of the drawings referred to, FIG. 4 is a perspective view showing a state of an inner panel constituting the rear door structure of the second embodiment viewed from the outside of the vehicle. Fig. 5 is an X-X sectional view of Fig. 4 . Fig. 6 is a side view of an inner panel in the second embodiment. Moreover, FIG. 6 shows the state where the hinge is mounted on the inner panel, and the vehicle body to which the inner panel is mounted is shown by a phantom line. In addition, since the rear door structure of this embodiment is configured in the same manner as that of the first embodiment except that the inner panel is different from the rear door structure of the first embodiment, in the following description, the inner panel will be mainly described. , and the same reference numerals are assigned to the same constituent elements as those of the first embodiment, and detailed description thereof will be omitted.

As shown in FIG. 4 , a beam 18 is attached to the inner panel 6 a so as to extend across the connection portions 17 , 17 between the side portion of the frame portion 9 and the reinforcement portions 10 a , 10 b. The beam 18 is formed in an arc shape so as to protrude in the direction D toward the exterior of the vehicle, and is curved along the outer surface of the rear door 2 (see FIG. 1 ) (the outer surface of the outer panel 5 (see FIG. 1 )). form. The beam 18 as described above is formed separately from the frame portion 9 and the reinforcing portions 10a, 10b. Furthermore, both end portions of the beam 18 are respectively attached to the beam attachment portion 19 by, for example, spot welding or the like (see FIG. 3 ). At this time, the beam 18 is attached to the beam attachment portion 19 from the vehicle outer side. In addition, the cross member 18 can also be installed from the inside of the vehicle. As shown in FIG. 5 , the cross-sectional shape of the beam 18 in this embodiment gradually increases in size from both end portions toward the center portion. That is, the beam 18 gradually becomes thicker in the direction extending toward the vehicle outer side as it goes from both ends toward the center (it gradually becomes thinner from the center toward both ends). A heavy object such as an unillustrated motor of the wiper 8 is attached to the central portion of the beam 18 as described above. Furthermore, the beam attachment portions 19 at the connection portion 17 are arranged on the same plane F defined in the vehicle width direction.

Furthermore, as shown in FIG. 6 , the cross member 18 is arranged such that a protruding direction H substantially perpendicular to the extending direction G (refer to FIG. 5 ) is along the opening and closing direction J of the rear door 2 .

Next, technical effects of the rear door structure 1b of the present embodiment will be described.

In this rear door structure 1b, by providing the beam 18 separately from the frame portion 9 and the reinforcement portions 10a, 10b, the press forming of the inner panel 6a can be easily performed, and the degree of freedom of the press forming can be increased. A larger opening (first opening 12) is ensured.

In addition, in the rear door structure 1b, since the beam 18 is curved in an arc shape, and its cross-sectional shape gradually increases from both ends toward the center (refer to FIG. 5 ), even in the center of the beam 18 Even if heavy objects such as the motor (not shown) of the windshield wiper 8 are installed at the parts, a great stress is generated, and the beam 18 can also exert sufficient rigidity. In addition, in other words, since the size of the cross-sectional shape of the beam 18 becomes gradually smaller from the central portion toward both end portions, it is possible to reduce the weight thereof.

Furthermore, in such a rear door structure 1b, since the cross member 18 is arranged such that the protruding direction H (refer to FIG. Therefore, particularly when the rear doors 2 are closed, the cross member 18 can exhibit sufficient rigidity for the applied load.

In addition, in the above-mentioned rear door structure 1b, since the respective beam mounting portions 19, 19 (see FIG. 5) of the beam 18 are respectively arranged on the same plane F (see FIG. 5) defined in the vehicle width direction, Especially when the rear door 2 is closed, the beam 18 can evenly transmit the applied load to the respective beam mounting portions 19 , 19 , and the load can be evenly distributed to the beam mounting portions 19 , 19 . In addition, in this rear door structure 1b, since the beam 18 is mounted on the same plane F, the positional alignment with the connecting portion 17 becomes easy, thereby improving the installation workability of the beam 18 .

Furthermore, the present invention is not limited to the above-described embodiments, and can be implemented in various forms.

In the above-mentioned first and second embodiments, the cut-and-raised portion 15 of the inner panel 6a is formed on all of the first opening 12, the second opening 13, and the third opening 14, but for this In terms of the invention, the cut-and-raised portion 15 may be formed on at least any one of the first opening 12 , the second opening 13 , and the third opening 14 .

(third embodiment)

In addition, in the above-mentioned second embodiment, the beam 18 is attached as a member separate from the inner panel 6a, but the present invention is not limited thereto. Here, FIG. 7 is a perspective view showing a state of an inner panel constituting a rear door structure according to another embodiment, viewed from the outside of the vehicle.

As shown in FIG. 7 , the inner panel 6 b constituting the rear door structure 1 c is formed integrally with the inner panel 6 b by press molding, and the beam 18 extending across the connecting portions 17 , 17 is formed integrally.

In the above-mentioned rear door structure 1c, since the beam 18 is integrally formed with the frame portion 9 and the reinforcement portion 10 (10a, 10b), rigidity is improved, and the rear door structure 1c (inner panel 6b) The manufacturing process is simplified.

In addition, in the above-mentioned embodiment, although the reinforcing parts 10a, 10b extend in a substantially linear shape, in the present invention, the reinforcing parts 10a, 10b may also extend in a curved form within a range that does not interfere with the object (technical problem) of the present invention.

(fourth embodiment)

Next, a fourth embodiment of the present invention will be described. First, the configuration of this embodiment will be described with reference to FIGS. 9 to 13 .

9 is a schematic view of a vehicle to which a rear door structure according to a fourth embodiment of the present invention is mounted, viewed from the rear.

The rear door structure 201a of the present embodiment is composed of an inner panel 202a and an outer panel 203 . The rear door structure 201 a is mounted on the vehicle V by hinges 214 . The inner panel 202a and the outer panel 203 are combined by hemming or spot welding. A frame portion 204a is formed on the inner panel 202a along the outer shape of the rear door structure 201 . A window frame portion 205a to which a window glass 207 is attached is formed on the frame portion 204a, and a beam 206a is also attached thereto. A lock mounting portion 210 is formed at the lower end of the frame portion 204a.

Fig. 10 is a perspective view of an inner panel used in the rear door structure of the present embodiment. A window frame portion 205a is formed on an upper portion of the frame portion 204a constituting the inner panel 202a. The frame portion 204a is formed by press molding. At the welding portions 213, 213 on the side of the pair of window frame portions 205a located at the lower end of the window frame portion 205a, a separate beam 206a is attached by spot welding from the vehicle outer side. In this way, the beam 206a is attached over the entire range of the opening between the pair of welding parts 213 and 213 . Furthermore, in the present embodiment, the beam 206a is attached from the outside of the vehicle in order to increase the strength against a collision when the rear door is closed, but it may be attached to the welded portions 213, 213 of the window frame portion 205a from the inside of the vehicle. place.

On the upper part of the beam 206a, an opening 208a for attaching a window glass is provided. Moreover, the opening part 209a is provided in the lower part of the beam 206a. A cut-out wall 211a is formed on the outer edge of these openings 208a, 209a. The cut-out wall 211a has the effect of improving the rigidity with respect to the bending of the inner panel 202a.

Fig. 11(a) is a perspective view of a separate beam 206a used in this embodiment. Fig. 11 (b) is a C-C sectional view of the central part of the beam 206a used in this embodiment. The beam 206a is formed separately from the frame portion 204a of the inner panel 202a by press molding (see FIGS. 9 and 10 ). The beam 206a has a pair of welded portions 223, 223 on the side of the beam 206a formed at both ends thereof. The pair of welded portions 223, 223 are located on the same plane and welded to the window frame portion 205a formed on the frame portion 204a constituting the inner panel 202a (refer to FIG. 10 ) as described above.

The portion sandwiched by these welded portions 223 constitutes the beam portion 221 . A pair of cut-and-raised portions 222 are formed on the beam portion 221 . The cut-and-raised portion 222 is provided to increase rigidity against bending in the lateral direction of the inner panel 202a.

The height of the cut-and-raised portion 222 increases from both ends of the beam portion 221 toward the central portion. It reaches the maximum height L3 in the central part. Therefore, the cross-sectional area of the beam 206 a becomes an arcuate shape that is largest at the central portion and smallest at both ends of the beam portion 221 . In this manner, the bending stress applied to the beam 206a becomes uniform within the beam 206a.

In addition, since the beam 206a is formed separately from the frame portion 204a, the degree of freedom of its shape is higher than that of the beam 206c (see FIG. 15 ) in the conventional example. For example, the maximum height L3 of the cut-and-raised portion 222 of the beam 206a can be easily made higher than the cut-and-raised wall 211c of the beam 206c of the conventional example. In addition, if the height of the cut-and-raised portion 222 is increased as a whole, even when the beam 206a is manufactured by press-forming a thinner plate material than the frame portion 204a, it is possible to similarly secure the bending of the beam 206a. rigidity.

In addition, since the beam 206 a is separately press-formed, the press-formability is good, so openings for weight reduction can be relatively easily formed at the bottom 224 and the upper curved portion 225 of the beam portion 221 . Although there are cases where holes for installing parts such as a wiper motor are formed in the upper bent portion 225 of the beam 206a, holes can be punched at any position because of good press formability. For example, in order to attach a wiper motor or the like to the beam 206a, weld nuts or the like for fixing may be welded to the upper bent portion 225 of the beam 206a in advance.

In the beam 206a of the inner panel 202a used in the rear door structure 201a (see FIG. 9 ) of this embodiment, the press forming direction (hereinafter, referred to as "pressing direction") when forming the beam 206a is perpendicular to the pair of welds. The directions of the faces of the portion 223 form a constant angle α. It can be seen from FIG. 11( b ) that the punching direction of the beam 206 a forms an angle α with the vertical direction of the surface of the welding portion 223 . Therefore, the surface of the cut-and-raised portion 222 formed by press molding is not perpendicular to the surfaces of the pair of welded portions 223 . When the rear door structure 201a including the inner panel 202a is attached to the vehicle V, the rear door structure 201a is rotated centering on the hinge 214 to which the rear door structure 201a is attached. At this time, the punching direction forms an angle α with respect to the perpendicular direction to the surfaces of the pair of welded portions 223 so that the surface of the cut-and-raised portion 222 is parallel to the tangential direction of the rotation circle of the rear door 201 .

FIG. 12 is an A-direction view of the inner panel 202a used in this embodiment (see FIG. 10 ). As shown in Figure 11 (b), the angle α formed by the stamping direction of the crossbeam 206a and the perpendicular direction of the faces of the pair of welded parts 223, 223 just corresponds to the sum of the face of the pair of welded parts 223, 223 and the center of the crossbeam 206a. The angle formed by the connecting line 1 of the hinge 214. According to this correspondence, the punching direction of the beam 206a is parallel to the tangential direction of the rotation circle of the rear door centered on the hinge 214 of the inner panel 202a.

When the rear door is closed, the rear door structure 201a is subjected to a force in the tangential direction of the above-mentioned rotation circle (refer to FIGS. 9 and 11 ). Thus, vibrations are generated on the rear door structure 201a. However, as described above, by making the punching direction of the beam 206a parallel to the tangential direction of the rotation circle of the rear door structure 201a, the rigidity of the cut-and-raised portion 222 (see FIG. The above-mentioned vibration can be effectively suppressed.

In the inner panel 202c of the conventional example shown in FIG. 15, since the beam 206c is integrally stamped with the frame portion 204c, the stamping directions of the frame portion 204c and the beam 206c are always the same. However, the punching direction of the beam 206a of this embodiment does not coincide with the punching direction of the inner panel 202a (see FIG. 12 ). In the present invention, since the beam 206a is a separate component from the inner panel 202a, the punching direction of the two components can be independently determined.

Since the beam 206a is a separate component from the frame portion 204a of the inner panel 202a, the thickness of the plate of the beam 206a can be set to be different from that of the frame portion 204a for the purpose of weight reduction as described above. In addition, the material of the beam 206a may also be selected from a material different from that of the frame portion 204a.

The corner 212a (see FIG. 10 ) where the beam 206a of the inner panel 202a is welded to the window frame 205a will be described in comparison with the corner 212c of the inner panel 202c of the conventional example shown in FIG. 15 . Fig. 13(a) is an enlarged view of part B of Fig. 10 in which the beam is welded to the inner panel of the present embodiment. Fig. 13(b) is an enlarged view of part D in Fig. 15 of the inner panel of the comparative example shown in Fig. 15 to which the beam is welded. As can be seen from FIG. 13( a ), in the case of the inner panel 202a of this embodiment, the beam 206a is attached substantially at right angles to the window frame portion 205a. On the other hand, in the case of the inner panel 202c of the comparative example in FIG. 13(b), since the beam 206c is integrally press-formed with the window frame portion 205c, the corner portion 212c needs to be provided with more than a certain amount of R in order to ensure press-formability. value. Thus, the window glass opening 208c of the inner panel 202c is smaller than the opening 208a of the inner panel 202a of this embodiment.

In the case of the inner panel 202a used in the rear door structure 201a of this embodiment, since the beam 206a is a separate part, the height L1 of the cut-out wall 211a of the inner panel 202a (refer to FIG. 13(a) and FIG. 10 ) can be determined independently of the maximum height L3 of the cut-out 222 (cf. FIG. 11 ) of the beam 206a. On the other hand, for the comparative example (see FIG. 13(b) and FIG. 15), since the beam 206c is integrally formed, the press formability is limited, and the height L2 of the cut wall 211c is between the frame portion 204c and the beam 206c. All aspects are restricted by stamping and can only be below a certain upper limit height Lc (not shown).

On the other hand, in the case of the inner panel 202a, since the beam 206a is separated from the frame portion 204a, the press formability is better than that of the inner panel 202c of the conventional example. Therefore, the height L1 of the cut-and-raised wall 211a can be made higher than the upper limit height Lc of the cut-and-raised wall 211c relatively easily. Therefore, the height L1 of the cut-out wall 211a can be increased, that is, the cross-sectional width of the rear door structure 201a in the inner and outer directions can be increased as needed, thereby increasing the rigidity of the frame portion 204a constituting the inner panel 202a.

Next, based on the configuration of the rear door structure 201a of the present embodiment described above, technical effects thereof will be described.

In the case of the structure of the rear door 1a of the present embodiment, the pressing direction of the beam 206a of the inner panel 202a can be determined independently of the pressing direction of the inner panel 202a. Therefore, as described above, door vibration at the time of closing the rear door can be effectively suppressed by selecting the pressing direction of the beam 206a compared to the conventional example.

In the case of the inner panel 202a used in the rear door structure 201a of the present embodiment, since the beam 206a is attached separately, the press formability of the inner panel 202a is improved compared with the conventional example. Therefore, the height of the cut-out wall 211a of the frame portion 204a of the inner panel 202a can be set higher than the height of the cut-out wall 211c of the inner panel 202c of the conventional example. Thereby, the rigidity of the inner panel 202a can be improved.

In the case of the inner panel 202a used in the rear door structure 201a of the present embodiment, as shown in FIG. Way to engage. Therefore, compared with the conventional example in which the beam 206c is integrally formed with the window frame portion 205c of the frame portion 204c as shown in FIG.

In the case of the inner panel 202a used in the rear door structure 201a of this embodiment, since the beam 206a is a separate part from the frame portion 204a (refer to FIG. 10 ), its shape can be changed to effectively improve the inner panel 202a. Rigidity of panel 202a. In addition, by making the beam 206a thinner or thicker than the frame portion 204a as necessary, the inner panel 202a can be reduced in weight or improved in rigidity. Moreover, the material of the beam 206a may be changed with respect to the frame part 204a. For example, for the purpose of reducing weight, the beam 206a may be made of aluminum alloy.

In addition, since the beam 206a is a separate member from the frame portion 204a, the plate material of the window opening portion punched out by the frame portion 204a is relatively large. Therefore, other components can be manufactured using the sheet material punched out by stamping.

In the case of the rear door structure 201a of this embodiment, small parts such as nuts may be pre-assembled to the separate beam 206a. For example, weld nuts for installing the wiper motor may be pre-welded on the beam 206a. In this way, the number of parts to be welded to the plate can be reduced, and the welding process can be simplified.

Embodiments of the present invention are not limited to the contents defined in the embodiments described above. It is also possible to change the respective components of the embodiment without departing from the gist of the present invention. For example, the stamping direction of the beam 206a shown in FIG. 12 does not have to be completely parallel to the tangential direction of the rotation circle of the rear door. In addition, the following modifications to the frame portion 204a of the inner panel 202a are also included in the technical scope of the present invention.

(fifth embodiment)

Fig. 14 is a perspective view of an inner panel reinforced with a V-shaped reinforcing frame used in a fifth embodiment of the present invention. In this embodiment, the upper portion of the frame portion 204b of the inner panel 202b is the same as the frame portion 204a of the inner panel 202a of FIG. 10 . However, from the two corners of the lower end of the window frame portion 205b provided on the frame portion 204b to the lock mounting portion 210, a V-shaped reinforcing frame portion 215 is provided, and openings are provided on both sides of the V-shaped reinforcing frame portion 215. 216a, 216b.

In the rear door structure using the inner panel 202b shown in FIG. 14, as described above, since the separate beam 206b is joined thereto, the press formability of the frame portion 204b is good. Thereby, the inner panel 202b can be provided with sufficient rigidity by the V-shaped reinforcing frame portion 215 having the height of the cut-out wall 211b raised. Therefore, in the case of the rear door structure using the inner panel 202b shown in FIG. The lightweight aspect of the door structure also has further technical effects.

Claims (16)

1. A rear door structure for a vehicle, having an inner panel disposed on the inner side of the vehicle and an outer panel disposed on the outer side of the vehicle, characterized in that: The inner panel has: a frame portion shaped along the profile of the rear door; A pair of reinforcing parts integrally formed with the frame part and extending in a substantially V-shape from a lower side of the frame part toward both side parts. 2 . The rear door structure for a vehicle according to claim 1 , wherein the inner panel has a surface that is smoothly and continuously formed from a side portion side of the frame portion to the reinforcement portion. 3 . 3. The rear door structure of a vehicle according to claim 1 or 2, wherein the pair of reinforcing parts are formed on the lower side of the frame part from the lock part on which the lock mechanism is installed to both sides. The side extends in a substantially V-shape. 4. The vehicle rear door structure according to any one of claims 1 to 3, characterized in that, the inner panel is integrally formed with a cutout protruding toward the outer panel side, and the cutout The rising part is connected with the outer panel. 5. The rear door structure of a vehicle according to any one of claims 1 to 4, wherein: It is formed with: On the upper side of the reinforcing part, a first opening defined between the reinforcing parts and the frame part; a second opening defined by the reinforcing portion and the frame portion on the lower side of one of the reinforcing portions; A third opening portion defined by the reinforcement portion and the frame portion on the lower side of the other reinforcement portion. 6. The rear door structure of a vehicle according to any one of claims 1 to 4, wherein the inner panel is further provided with an integrated cross beam, and the cross beam straddles the side portion of the frame portion The connecting parts with the reinforcing part are installed so as to extend from each other, and are integrally formed by press molding. 7. The rear door structure of a vehicle according to any one of claims 1 to 5, wherein the inner panel is integrally formed by stamping, and also has a separate beam, the beam It is attached so that the side part of the said frame part and the connection part of the said reinforcement part may extend between each other. 8. The rear door structure of a vehicle according to claim 7, wherein the beam protrudes to the outside of the vehicle and is curved in an arc shape, and the size of its cross-sectional shape increases from its central portion gradually decreases toward both ends. 9. The rear door structure of a vehicle according to claim 7 or 8, wherein the cross member is configured such that the extending direction substantially perpendicular to the extending direction thereof is along the opening and closing direction of the rear door. 10. The rear door structure of a vehicle according to any one of claims 7 to 9, wherein each mounting portion of the beam on each of the connecting portions is respectively arranged at a predetermined position in the vehicle width direction. on the same plane. 11. A rear door structure for a vehicle, comprising an inner panel on the inner side of the vehicle and an outer panel on the outer side of the vehicle, the inner panel is formed by stamping and has a frame portion in a shape along the outer shape of the rear door, Features: A window frame portion for installing window glass is formed on the upper portion of the frame portion; Moreover, a split beam is installed between the two corners of the lower end of the window frame. 12. The rear door structure of a vehicle according to claim 11, wherein: The beam is formed by stamping; Furthermore, the inner panel and the beam are formed in different punching directions. 13. The rear door structure of a vehicle according to claim 11 or 12, characterized in that: The beams are installed at both lower end corners of the window frame at substantially right angles to the frame of the inner panel. 14. The rear door structure of a vehicle according to any one of claims 11 to 13, characterized in that: The inner panel and the beam have different cross-sectional widths in an inner-outer direction of the rear door. 15. The rear door structure of a vehicle according to any one of claims 11 to 14, characterized in that: The beam and the inner panel have different plate thicknesses. 16. The rear door structure of a vehicle according to any one of claims 11 to 15, characterized in that: The materials of the inner panel and the beam are different.

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