JP2019026037A - Vehicle rear part structure - Google Patents

Abstract

To provide a vehicle rear part structure capable of achieving excellent load bearing capacity of a lower back member while suppressing an increase in a weight and a rise in a manufacturing cost.SOLUTION: In at least areas nearer to lower ends of a pair of left and right pillar members 3 constituting both-side parts in the vehicle width direction of a back door opening 1 formed at a rear part of a vehicle V, there are formed inclination parts 30, 31 inclined to be positioned nearer to the center in the vehicle width direction as it goes more downward. The whole or a part of a lower back member 4 constituting a lower side part of the back door opening 1 is formed as an arch part 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a rear structure of a vehicle in which a back door opening is provided at the rear of a vehicle such as an automobile.

  As a rear structure of a vehicle, for example, as described in Patent Document 1, there is a vehicle in which a back door opening that can be opened and closed by a back door is provided at the rear of the vehicle. According to such a configuration, for example, it is possible to easily load and unload luggage to the rear of the passenger compartment from the back door opening, which is convenient.

  However, the prior art has room for improvement as described below.

That is, it is necessary to increase the strength of the rear part of the vehicle in the same manner as other parts of the vehicle. Here, the upper side of the back door opening, both sides in the vehicle width direction, and the lower side are typically formed by a roof member, a pair of left and right pillar members (rear end pillar members), and a lower back member, respectively. However, among these, the weight of the roof member and the pillar member acts on the lower back member, as well as the weight of the luggage mounted on the rear part of the vehicle or the weight of the passenger seated on the rear seat. Therefore, it is necessary that the lower back member in the periphery of the back door opening is excellent in load resistance and suppresses bending deformation due to the load.
However, as a means for solving this problem, it is conceivable to increase the thickness of the lower back member or to provide many reinforcing members. However, simply adopting such means increases the vehicle weight. Further, the production cost of the vehicle becomes expensive due to the deterioration of productivity.

JP 2003-104239 A

  The present invention has been conceived under the circumstances as described above, and the lower back member has excellent load resistance while suppressing an increase in weight, an increase in manufacturing cost, and the like. The challenge is to provide a possible vehicle rear structure.

  In order to solve the above problems, the present invention takes the following technical means.

  The rear structure of the vehicle provided by the present invention is provided with a back door opening at the rear of the vehicle, a pair of left and right pillar members that form both sides in the vehicle width direction of the back door opening, and the pair of pillars. A lower back member having both ends in the longitudinal direction connected to the lower end portion of the member and forming a lower side portion of the back door opening, the rear structure of the vehicle, wherein at least one of the pair of pillar members The lower end portion region is provided with an inclined portion which is inclined so as to be located closer to the center in the vehicle width direction as it goes downward, and the whole or a part of the lower back member is formed as an arch portion. It is a feature.

According to such a configuration, the following effects can be obtained.
As will be understood from the description below with reference to FIG. 3, according to the configuration of the present invention, the horizontal component force generated in the inclined portion of the downward load acting on the pair of pillar members is lower-backed. The arch portion of the lower back member is compressed in the horizontal direction by acting on the member, and an upward force can be generated. For example, the weight of a load, a rear seat, an occupant, etc. mounted on the rear part of the passenger compartment acts separately as a downward load on the lower back member. It is possible to reduce the downward load that is substantially received. As a result, the load resistance of the lower back member is improved, and bending deformation of the lower back member can be appropriately suppressed.
By improving the load resistance of the lower back member, it is possible to reduce the thickness of the lower back member or reduce the number of reinforcing members. Therefore, it is possible to promote weight reduction, productivity improvement, and reduction of manufacturing cost.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a principal part external appearance perspective view which shows an example of the rear part structure of the vehicle which concerns on this invention. (A) is a front view of the rear structure of the vehicle shown in FIG. 1 as viewed from the rear of the vehicle, and (b) is a sectional view taken along line IIb-IIb in FIG. It is explanatory drawing which shows typically the rear part structure of the vehicle shown in FIG. 1 and FIG. 2, and its effect | action.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
In the drawings, an arrow Fr indicates the front of the vehicle, an arrow W indicates the vehicle width direction, and an arrow Up indicates the upper side in the vehicle height direction.

  In the rear structure A of the vehicle shown in FIGS. 1 and 2, a back door opening 1 that is opened and closed by a back door (not shown) is formed at the rear of the vehicle V. The upper side of the back door opening 1, both sides in the vehicle width direction, and the lower side are formed by a roof member 2, a pair of left and right pillar members 3 (rear end pillar members), and a lower back member 4. Although a detailed description of the structure of each of these parts is omitted, as shown in FIG. 2 (a), the roof member 2 includes upper and lower panel members 2a and 2b, and each pillar member 3 includes inner and outer panels. The members 3a and 3b and the lower back member 4 are provided with inner and outer panel members 4a and 4b, and these are connected in series.

  The region closer to the lower end of each pillar member 3 has a basic form that is inclined so as to be positioned closer to the center in the vehicle width direction as it goes downward. Specifically, the outer panel member 3b is provided with an inclined portion 30 that is inclined so as to be positioned closer to the center in the vehicle width direction as it proceeds downward in the range indicated by reference numeral S. The inner panel material 3 a is provided with a curved inclined portion 31 that is inclined in the same direction as the inclined direction of the inclined portion 30 at a location adjacent to the lower back member 4. As will be described later, the inclined portions 30 and 31 generate a force for compressing the lower back member 4 from both sides in the horizontal direction. The inclined portions 30 and 31 are preferably formed as long as possible in the vehicle front-rear direction, but more preferably from at least the rear wheel arch portion 9 to the vehicle rear end.

Specifically, the lower back member 4 has a cross-sectional structure as shown in FIG. 2 (b), and as described above, the lower back member 4 has a hollow shape in which the inner and outer panel members 4a and 4b are combined. The rear part is placed. The lower side of the vehicle width direction center part of the inner panel material 4a is formed as an arch part 40 (the bottom wall part 41a of the inner panel material 4a, the lower part of the front wall part 41b, and the rear wall of FIG. 2B). The lower part of the part 41c is arched). Here, the arch portion 40 has a bow shape that is curved in an upwardly convex shape, similarly to the arch of the general concept, but in this embodiment, a part of the uppermost portion of the arch portion 40 is a horizontal straight line. Yes. Even with such a configuration, it is possible to obtain the effects described later that are intended by the present invention. Of course, the entire arch portion 40 may have an arch shape including only a smooth curve. On the other hand, in this embodiment, the outer panel material 4b of the lower back member 4 is not provided with an arch portion. If such a structure is employ | adopted, it can avoid that the upper surface of the vehicle width direction center part of the lower back member 4 becomes a shape which protruded upwards rather than the upper surface of the edge part.

  FIG. 3 schematically shows the basic configuration of the rear structure A of the vehicle described above. With reference to the same figure, the effect | action of the rear part structure A of a vehicle is demonstrated below.

  First, a static load Wa such as the weight of the roof member 2 or the weight of the pillar member 3 is constantly acting on each pillar member 3. This static load Wa is vertical in the inclined portions 30 and 31. In addition to the directional component force Wt, a horizontal component force Wn (component force) is generated. The horizontal component force Wn acts as a force that compresses both ends of the lower back member 4 toward the vehicle width center side. Then, an upward force F is generated in the arch portion 40 of the lower back member 4 based on the shape characteristics of the arch portion 40.

  On the other hand, a downward load Wb such as a rear seat (not shown) mounted on the floor panel 80 or the weight of the load acts on the lower back member 4. However, since the above-described upward force F is generated in the lower back member 4, the lower back member 4 substantially receives a load obtained by reducing the upward force F from the downward load Wb. Become. Therefore, the load resistance of the lower back member 4 and thus the load resistance of the vehicle V can be improved. Further, as described above, if the load acting on the lower back member 4 can be substantially reduced, the lower back member 4 can be made thinner or smaller by that amount, and the vehicle V can be reduced in weight. And reduction of manufacturing costs can be promoted.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the rear structure of the vehicle according to the present invention can be modified in various ways within the scope intended by the present invention.

In the above-described embodiment, a part of the lower side (inner panel material 4a) of the lower back member 4 is formed as the arch portion 40. However, a substantially full length region in the longitudinal direction on the lower side may be formed as the arch portion. Further, instead of or in addition to providing the arch portion 40 on the lower side of the lower back member 4, an arch portion may be provided on the upper side (outer panel material 4 b) of the lower back member 4.
The arch part referred to in the present invention only needs to have an arched shape that generates an upward force when it receives a compressive force in the horizontal direction. The specific size, radius of curvature, etc. are not limited.

  As the inclined portion of the pillar member, the two inclined portions 30 and 31 described above are not necessarily provided, and only one of them may be provided. The inclined portion referred to in the present invention only needs to be inclined so that a part of the downward load acting on the pillar member acts as a force for compressing the lower back member 4 in the horizontal direction, and a specific inclination angle thereof. There is no limitation on the vertical length.

A Vehicle rear structure V Vehicle 1 Back door opening 3 Pillar members 30, 31 Inclined portion 4 Lower back member 40 Arch portion

Claims (1)

There is a back door opening at the rear of the vehicle,
A pair of left and right pillar members that form both sides of the back door opening in the vehicle width direction; and
A lower back member that is connected to both lower ends of the pair of pillar members in the longitudinal direction and forms a lower side portion of the back door opening;
A vehicle rear structure comprising:
In at least the lower end portion region of the pair of pillar members, an inclined portion that is inclined so as to be positioned closer to the center in the vehicle width direction as it goes downward is provided
A rear structure of a vehicle, wherein the lower back member is entirely or partially formed as an arch portion.

Images