JPS6117689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear door device for an automobile that provides good rearward visibility and low air resistance when traveling.

Generally, in a hatchback type car, a rear door is provided at the rear end of the ceiling surface of the vehicle body, forming a part of the ceiling surface, and smoothly connecting to the rear door, which can be opened and closed vertically. , a transparent plate such as a glass plate is framed by a metal window frame, so the window frame obstructs the view to the rear to some extent, and there is no space between the window frame or the transparent plate. The seal rubber, which protrudes from the outer surface of the transparent plate when the vehicle is in use, has some disadvantages, such as creating resistance to airflow flowing across the ceiling surface when the vehicle is running.

Therefore, the present invention forms the main body of the rear door of the rear door device using a single transparent plate, so that good rearward visibility can be obtained over the entire area of the rear door, and the main body of the rear door is formed into a unique shape. Accordingly, it is an object of the present invention to provide a new rear door device for an automobile, in which the aerodynamic characteristics of the rear door are significantly improved.

To achieve such an object, the present invention provides an automobile in which a rear door is hinged to the rear end of the ceiling surface of the vehicle body so as to be able to open and close vertically, wherein the rear door is made of a single transparent plate. The rear door main body includes a top main body portion having a streamlined longitudinal section and a top main body portion continuous with the rear end of the ceiling surface, and a top rear edge portion extending approximately horizontally from the rear end edge of the top main body portion. and a rear surface portion that bends and hangs downward at a substantially right angle from the rear edge portion of the upper surface, and is characterized in that the three portions are seamlessly formed integrally.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The body F of a hatchback type automobile, generally designated by the symbol V, is open 2 from the rear half of its upper surface to the upper half of its rear surface. , the opening part 2 has a hinge member 3 at the rear edge of the ceiling surface 1.
It is opened and closed by a rear door Dt which is hinged 4 and can be opened and closed vertically.

The rear door main body 5 of the rear door Dt is integrally formed of a single transparent plate such as a glass plate.

Next, the rear door main body 5 made of that single transparent plate
To explain the structure, this includes an upper main body portion 5a having a streamlined longitudinal section, an upper rear edge portion 5b extending approximately horizontally from the rear end edge of the upper main body portion 5a, and a short belt-shaped upper surface rear edge portion 5b in the front and rear. It is composed of only three parts, including a rear face part 5c which is bent at a substantially right angle downwardly from the edge part 5b and hangs downward, and these three parts are formed seamlessly and integrally. Thus, the upper main body portion 5a
The tangent line t-t along the rear edge of the streamlined upper surface of and the horizontal line h
-h is set to 8 to 20 degrees, and the angle β between the line u-u along the upper surface of the rear edge of the substantially horizontal upper surface and the tangent t is set to 10 to 30 degrees. is appropriate.

A conventionally extendable support rod 6 is connected between the intermediate portion of one side edge of the rear door Dt and the vehicle body F, and the extension of the support rod 6 holds the rear door Dt in the open position.

A groove 7 is formed on the periphery of the open part 2 of the vehicle body F,
A seal rubber 8 is attached to the edge of this groove 7, and this seal rubber 8 provides a watertight seal between the periphery of the open portion 2 of the vehicle body F and the base of the rear door main body 5.

By the way, the rear door main body 5 is formed of a single transparent plate such as a glass plate, and there is no frame or seal rubber for trimming the frame, so that the driver's rear visibility is extremely good.

The substantially horizontal upper surface trailing edge 5b allows the upper surface main body portion 5 of the rear door main body 5 to be lowered from the ceiling surface 1 when the automobile is running.
Using the wind pressure of the air flow along the direction a, the rear of the vehicle can be pressed against the road surface to achieve a so-called air spoiler function.

FIG. 3 shows a second embodiment of the invention. In this embodiment, a frame 11 is provided around the entire circumference of a rear door main body 5 having the same shape as in the first embodiment, and a hinge member 3' is provided between the frame 11 and the back surface of the vehicle body F.

Also in the case of this second embodiment, exactly the same effects as those of the first embodiment can be achieved.

Incidentally, since the frame 11 is outside the driver's rear view, it does not interfere with the driver's view.

As described above, according to the present invention, the following excellent effects can be achieved.

Since the rear door Dt has transparent not only the upper main body part 5a and the rear face part 5c but also the upper rear edge part 5b of the rear door main body 5, there is nothing on the rear door main body 5 that obstructs the rear view of the driver. Becomes,
Very good rear visibility can be obtained.

Since only the three parts, the upper main body part 5a, the upper rear edge part 5b, and the rear part 5c, whose mutual boundaries extend parallel to each other, are seamlessly formed from a single transparent plate, it is extremely easy to mold these three parts. Moreover, it can be done with high precision and costs can be reduced.Furthermore, there is no frame or seal rubber for trimming the frame at the boundary between the three, so there is no need to worry about water leaking from the boundary. There will be none.

The upper main body portion 5a, which functions as a rectifier for the traveling wind, the upper rear edge portion 5b, which functions as an air spoiler, and the rear surface portion 5c can be precisely manufactured into shapes and angles that are optimal for their respective functions by integrally molding them. From there, the frame, seal rubber, etc. are placed at the boundary between the three.
Coupled with the fact that there are no protrusions that would increase air resistance, the aerodynamic characteristics of the rear door itself are significantly improved.

Stress concentration portions of the rear door main body 5 occur in a distributed manner in the boundary between the upper surface rear edge 5b and the rear surface 5c, and at the boundary between the upper surface rear edge 5b and the upper surface main body 5a. Even if a large load is applied to the rear door main body 5, such as when the rear door Dt is forcefully closed, there is no risk of stress concentrating only on one of the two stress concentration areas, and the strength of the rear door main body 5 is maintained. It can contribute to growth.

[Brief explanation of the drawing]

Figures 1 and 2 show a first embodiment of the present invention, where Figure 1 is a perspective view of an automobile equipped with the device of the present invention, Figure 2 is an enlarged sectional view taken along the line of Figure 1, and Figure 3 is an enlarged sectional view taken along the line of Figure 1. This shows a second embodiment of the present invention, and is the same cross-sectional view as FIG. 2. Dt...Rear door, F...Vehicle body, 1...Ceiling surface, 4...
Hinge connection, 5... Rear door main body, 5a... Top main body part, 5b... Top rear edge part, 5c... Rear face part.

Claims (1)

[Claims] 1 Attach the rear door Dt to the rear end of the ceiling surface 1 of the vehicle body F,
In an automobile which is hinged 4 so as to be able to be opened and closed vertically, the rear door Dt includes a rear door main body 5 made of a single transparent plate, and this rear door main body 5 is connected to the rear end of the ceiling surface 1. an upper surface main body portion 5a having a streamlined longitudinal section and an upper surface rear edge portion 5b extending approximately horizontally from the rear end edge of the upper surface main body portion 5a.
and a rear surface portion 5c that bends and hangs downward at a substantially right angle from the upper surface rear edge portion 5b, and the three portions are formed seamlessly and integrally. Rear door device.