JP4391267B2 - Lift gate structure - Google Patents

Description

The present invention relates to a structure of a resin lift gate .

In recent years, vehicle opening / closing bodies such as rear gates have been mainly made of resin for the purpose of realizing weight reduction and recycling. Such a resin opening / closing body is generally configured by combining an outer member and an inner member as disclosed in, for example, Japanese Patent Laid-Open No. 63-151518 (Patent Document 1). In such a case, a reinforcing structure such as a rib is generally adopted in almost the entire area of the outer member or the inner member in order to ensure a strength of the opening / closing body main body that is not less than a predetermined level.
JP 63-151518 A

  As such a reinforcing structure, conventionally, for example, a rib having a cross pattern such as a cross shape is often formed on all or a part of the outer member or the inner member. However, when such a rib shape is employed, the finished outer member or inner member may be distorted. In order to secure a strength exceeding a predetermined level, a method of complicating the rib structure or setting the rib thickness large may be considered, but in this case, there is a possibility that the molding process becomes complicated and the manufacturing cost increases. is there.

  The present invention has been made in view of the above technical problem, and provides a structure of a resin vehicle opening / closing body that has a relatively simple structure and can ensure a predetermined strength or more without causing distortion. It is.

In order to achieve the above object, according to one aspect of the present invention, a resin inner panel and an outer panel are joined to each other, and an opening of a cargo compartment that opens toward the rear of the vehicle at the rear of the vehicle body can be freely opened and closed. provides the structure of the lift gate which covers, in the structure of the lift gate, the inner panel, the upper area in the vertical direction of the panel body, which has an opening formed to mount the window panel, said opening A step portion projecting to the outer panel side is provided below the portion, and a bottom portion set on the inner side of the step portion is connected to the periphery of the step portion via a first connection wall portion. while being, on the periphery of the bottom portion, the panel peripheral edge portion having a flat surface facing the outer panel side is coupled via a second connecting wall portion, Pa of the inner panel Injection point on the panel corresponding to the injection gate provided in order to inject a resin material into a mold for Le molding is formed in the step portion, between the outer periphery of the injection point and the panel peripheral edge portion, Reinforcing ribs are provided so as to continue from the left and right sides of the stepped portion to the bottom portion, the second connecting wall portion, and the flat portion of the peripheral edge portion of the panel and extend linearly in a front view .

  In addition, the injection point is located at least in the center of the panel body in the width direction or in the vicinity thereof, and the reinforcing rib extends from the region where the injection point is located in a divergent shape toward the left and right obliquely downward. Also good. Alternatively, the injection point may be located at least in the center of the panel body in the width direction or in the vicinity thereof, and the reinforcing rib may extend in the horizontal direction from the region where the injection point is located.

  Furthermore, the reinforcing ribs may be formed so as to extend from the position spaced a predetermined distance from the injection point toward the peripheral edge of the panel.

  Furthermore, the panel on which the reinforcing ribs are formed may be formed of a synthetic resin material containing glass fibers.

  Furthermore, the reinforcing ribs may be formed in a cross shape at the peripheral edge of the panel and in the vicinity thereof.

According to the present invention, Oite the finished inner panel, continuous reinforcing ribs formed so as to extend linearly in a front view from the injection point to the flat portion of the panel periphery, with respect to the distortion direction of the panel body The panel body can be prevented from being distorted. According to this, it is possible to secure a strength of a predetermined level or more without causing distortion of the panel body with a relatively simple structure without causing complication of the molding process and an increase in manufacturing cost.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view showing the vehicle from the rear. The vehicle 1 has a lift gate 2 mounted on the rear side thereof so as to be movable up and down so as to open and close the rear cargo compartment. The window panel 3 is attached to a substantially upper half region of the lift gate 2, and the left and right upper peripheral edges are set to a shape that avoids the combination lamp 4 provided on the vehicle body side.

  The lift gate 2 is basically configured by joining an inner panel 10 that forms a vehicle interior wall and an outer panel 30 (see FIG. 3) that forms an outer wall of the vehicle body when the lift gate 2 is closed. . FIG. 2 is a front view of the inner panel 10 according to the present embodiment, more specifically, a front view as seen from the side where the outer panel 30 is attached. In this embodiment, by providing the inner panel 10 with a relatively simple predetermined structure, a panel that is less likely to cause distortion is realized.

  First, the basic structure of the inner panel 10 will be described. In the lower half region of the inner panel 10, a step portion 11 is formed that extends to the center in the width direction of the panel body and the vicinity thereof and protrudes toward the outer panel 30. The step portion 11 is a space portion for housing or holding various components including a wiper motor and a door lock unit on the surface side forming the vehicle interior wall, that is, the surface side opposite to the surface shown in FIG. 34 (see FIG. 3). Note that the step portion 11 actually has a complicated shape to store or hold various components, but here, it is shown in a simplified manner to ensure clarity of the drawing.

A bottom portion 13 set lower than the step portion 11 is connected to the periphery of the step portion 11 via a connecting wall portion 12, and the bottom portion 13 is linearly formed outward from the step portion 11 to the outside of the panel. Reinforcing reinforcing ribs 14 are provided. In the present embodiment, the reinforcing ribs 14 are formed so as to extend obliquely downward from the left and right sides of the step portion 11, and form a divergent shape as a whole.
A panel peripheral edge portion 16 is connected to the periphery of the bottom portion 13 via a connecting wall portion 15, and a cross-shaped reinforcing rib 17 is provided on the panel peripheral edge portion 16.

  On the other hand, an opening 18 to which the window panel 3 is attached is formed in the upper half region of the inner panel 10. Further, a cross-shaped reinforcing rib 20 is formed on the peripheral edge 19 of the opening 18 over substantially the entire area. Furthermore, a cutout portion 21 for avoiding the combination lamp 4 is formed from the upper half area of the inner panel 10 to a part of the lower half area.

  In this embodiment, as a mold for molding an inner panel, a mold in which injection gates 42 (see FIG. 4) for injecting resin are set at two portions corresponding to the step portion 11 of the inner panel 10. Is adopted. The number of injection gates may vary depending on the size of the molded product. Hereinafter, a portion corresponding to the injection gate 42 in the step portion 11 is referred to as an injection point and is denoted by reference numeral 11a. As described above, the injection point 11a is set at the center portion in the width direction of the inner panel 10 and the step portion 11 provided in the vicinity thereof, so that when the inner panel is molded, the resin is transferred from the center of the panel body to the panel peripheral portion side. It flows in the mold cavity 41 (see FIG. 4) so as to spread. In this case, in a region corresponding to the linear reinforcing ribs 14 formed on the bottom portion 13, a flow of resin in a certain direction from the center of the panel body toward the panel peripheral portion side is brought about. Details of the resin flow will be described later with reference to FIG.

  FIG. 3 is a longitudinal cross-sectional explanatory view showing a peripheral portion of the lift gate 2 formed by joining the inner panel 10 and the outer panel 30 to each other. As can be clearly understood from this figure, the step portion 11 of the inner panel 10 defines a space portion 34 for housing various components (not shown) on the side forming the vehicle interior wall. The cover body 36 covers the various components. The inner panel 10 and the outer panel 30 are opposed to each other at the edge of the peripheral edge of each panel or in the vicinity thereof, and are joined by interposing an adhesive 32 at the opposed portions.

  4A to 4D are explanatory views schematically showing the flow of the resin injected into the mold when the inner panel 10 is injection molded. In the present embodiment, a resin material containing glass fibers is used as a synthetic resin material for molding the inner panel 10. In forming the inner panel 10, the upper mold 40 </ b> A and the lower mold 40 </ b> B are combined to form a cavity 41 corresponding to the contour of the inner panel 10. In FIG. 4, as a part of the cavity 41, a region 43 (hereinafter referred to as a step region) corresponding to the step portion 11 of the inner panel 10 and a region 44 (hereinafter referred to as a connection wall portion region) corresponding to the connection wall portion 12. A region 45 corresponding to the bottom 13 (hereinafter referred to as a bottom region) and a region 46 corresponding to the linear reinforcing rib 14 (hereinafter referred to as a rib region). Resin is injected into the cavity 41 from an injection gate 42 provided at a site forming the stepped region 43 of the upper mold 40A. In this figure, in order to ensure the clarity of the figure, the flow of injected resin is only indicated by arrows, and hatching indicating the resin itself is omitted.

  First, as shown in FIG. 4A, the resin injected into the cavity 41 spreads all around the step region 43 around the injection point. Subsequently, as shown in FIG. 4B, the resin flowing toward the panel peripheral edge 16 (not shown in FIG. 4) flows into the connection wall portion region 44. Thereafter, as shown in FIG. 4C, the resin further flows into the bottom region 45 and the rib region 46. Then, as shown in FIG. 4D, the resin flows in a certain direction within the bottom region 45 and the rib region 46.

  According to the verification performed by the inventor of the present application, as described above, the molding is performed such that the resin flows in the fixed direction in the bottom region 45 and the rib region 46, so that the completed inner panel 10 is formed. In the formed linear reinforcing rib 14, it was confirmed that the glass fibers contained in the resin face a certain direction.

  By providing the reinforcing ribs 14 formed as described above on at least a part of the inner panel main body (the bottom portion 13 in the present embodiment), the reinforcing ribs 14 in the completed panel main body are arranged in the direction of distortion of the panel main body. As a result, the panel body can be prevented from being distorted. Thereby, in the inner panel 10, it is possible to ensure a strength of a predetermined level or more without causing distortion of the main body with a relatively simple structure without causing a complicated molding process and an increase in manufacturing cost.

Note that the present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes are possible without departing from the scope of the present invention.
For example, in the embodiment described above, the reinforcing ribs 14 extending in the oblique direction from the resin injection point 11a located at the center of the inner panel 10 or in the vicinity thereof to the panel peripheral edge portion 16 are formed, but the present invention is not limited thereto. The inventor of the present application has confirmed that the same effect as described above can be obtained if the rib extends linearly from the injection point 11a to the peripheral edge 16 of the panel. FIG. 5 shows an inner panel 50 in which a linear reinforcing rib 54 extending in the horizontal direction is formed between the injection point 11 a and the panel peripheral edge 16 as an example. In the inner panel 50, cross-shaped reinforcing ribs 57 including ribs extending in the horizontal direction and ribs extending in the vertical direction are provided on the panel peripheral edge portion 16.
Further, in the above-described embodiment, the example in which the inner panel 10 is provided with the reinforcing rib is taken up. However, the present invention is not limited to this, and the present invention can also be applied to the case where the outer panel 30 is provided with the reinforcing rib. Yes, the same effect as described above can be obtained.

It is a perspective view which shows a vehicle from back. It is a front view of the inner panel which concerns on embodiment of this invention. It is longitudinal cross-sectional explanatory drawing which shows the peripheral part of the lift gate formed by joining an inner panel and an outer panel. It is explanatory drawing which shows roughly the flow of the resin inject | poured in a metal mold | die at the time of inner panel shaping | molding. It is a front view of the inner panel which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vehicle 2 ... Lift gate 3 ... Window panel 10 ... Inner panel 11 ... Step part 11a ... Injection | pouring point 12 ... Connection wall part 13 ... Bottom part 14 ... Linear rib 15 ... Connection wall part 16 ... Panel in panel main body lower side area | region Peripheral part 17 ... Cross-shaped rib 18 ... Opening part 19 ... Panel peripheral part in panel main body upper side region 20 ... Cross-shaped rib 30 ... Outer panel 40A ... Upper die 40B ... Lower die 41 ... Cavity 42 ... Injection gate 43 ... Step region 44 ... Connecting wall part region 45 ... Bottom part region 46 ... Rib region

Claims (6)

In the structure of the lift gate that is formed by joining the resin inner panel and the outer panel, and covers the opening of the luggage compartment that opens toward the rear of the vehicle at the rear of the vehicle body ,
The inner panel includes an opening formed to attach the window panel in an upper region in the vertical direction of the panel main body, and includes a stepped portion projecting toward the outer panel below the opening. ,
Around the step portion, a bottom portion set on the inner side of the step portion is connected via a first connecting wall portion, and on the periphery of the bottom portion, a flat portion facing the outer panel side. The panel peripheral part which has is connected via the 2nd connecting wall part,
An injection point on the panel corresponding to an injection gate provided to inject a resin material into a panel molding die of the inner panel is formed in the step portion.
Between the outer circumference of the injection point and the panel peripheral edge portion, the left and right of the step portion, the bottom portion, linearly at a continuous front view to the planar portion of the second connecting wall portion and the panel periphery Reinforcing ribs formed to extend to are provided,
A lift gate structure characterized by that. The injection point is located at least in the center of the panel body in the width direction or in the vicinity thereof, and the reinforcing rib extends from the region where the injection point is located so as to extend obliquely downward toward the left and right. 2. The structure of a lift gate according to claim 1, wherein The injection point is located at least in the center of the panel body in the width direction or in the vicinity thereof, and the reinforcing rib extends in a horizontal direction from the region where the injection point is located. The structure of the lift gate as described in 1 or 2. The lift gate structure according to any one of claims 1 to 3 , wherein the reinforcing rib is formed so as to extend toward a peripheral edge of the panel from a position spaced apart from the injection point by a predetermined distance. The lift gate structure according to any one of claims 1 to 4 , wherein the panel on which the reinforcing ribs are formed is formed of a synthetic resin material containing glass fibers. The lift gate structure according to any one of claims 1 to 5 , wherein the reinforcing rib is formed in a cross shape at the peripheral edge of the panel and in the vicinity thereof.

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