JPH04138915A - Door structure of vehicle - Google Patents

Abstract

PURPOSE:To prevent rickety motion in which a door vibrates shockingly at the fully open position by providing a damper whose assist force becomes the maximum when the lift type door is fully open and a spring whose assist force becomes the maximum when the door is fully closed and which enters no load condition between door fully open condition and door fully close condition. CONSTITUTION:A lower end section 3a of a damper 3 which assists upward oscillation of a door 2 is connected to a front header 1c side at the periphery of a door opening 1a in such a way that it can oscillate, and its upper end section 3b is connected to a frame of the door 2. A coil spring 4 is provided in the inside of end section of the door 2 and the front head 1c side, and its extension sections 4a, 4b are provided in the inside of the door 2 and the front header 1c side. When the opening operation of the door 2 is started, assist force of the coil spring 4 is made the maximum, assist force in the door close direction of the damper 3 is reduced, and operating force at the start of opening is reduced. On the other hand, when the door 2 is fully open, assist force of the damper 3 is made the maximum, assist force in the door close direction is generated by the coil spring 4, and the door 2 is braked to open it fully at low speed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a flip-up type vehicle door structure.

[Prior art]

In a conventional vehicle having a flip-up type door, an opening is provided extending from the roof to the side of the vehicle body, and the central side of the roof is The door had a hinge on its edge and could be opened by upward motion, and the flange around the opening and the door frame were connected by a damper that assisted the upward swing of the door.

[Problem M to be solved by the invention] However, in the above-mentioned conventional flip-up door structure, the force of the damper assisting the upward swing of the door when the door is fully opened is excessive. Since the door operation force takes the maximum value, there is a problem in that the door receives too much upward momentum near the fully open position, causing the door to shake shockingly at the fully open position.

An object of the present invention is to provide a vehicle door structure that can prevent the door from shaking in a fully open position, and can reduce the operating force of the door when starting an opening operation from a fully closed position.

[Means for Solving the Problems] In order to achieve the above object, the vehicle door structure of the present invention has the following features:
A flip-up type vehicle door structure is equipped with a damper that maximizes the assisting force to assist the door opening operation when the door is fully opened, and a spring that maximizes the assisting force that assists the door opening operation when the door is fully closed. The spring is in an unloaded state between the door fully open state and the door fully closed state, and generates an assisting force in the direction of closing the door when the door is fully open, and an assisting force in the direction of opening the door when the door is fully closed. .

[Function] In the vehicle door structure of the present invention configured as described above, the assist force of the spring that assists the door opening operation is at its maximum when starting the opening operation from the fully closed state. The force is small.

Next, when the door is fully opened, the assist force of the damper to assist the door opening operation reaches its maximum, but since the spring generates an assist force in the door closing direction, the door operating force decreases near the fully open position. However, the movement of the door is braked and reaches the fully open position at a slow speed, which prevents the door from shaking violently.

〔Example] Embodiments of the present invention will be described based on the drawings.

1 and 2, a door opening 1a is provided extending from the roof to the side of the vehicle body 1, and the door opening 1a
A hinge is provided at the edge of the center side of the roof, and a door 2 is provided which can be opened by moving upward by the hinge.

The lower end 3a of a damper 3 that assists the upward swinging of the door is movably connected to the flange portion on the front edge of the door opening 18 on the side of the door 1c, and the upper end 3b is connected to the frame of the door 2. There is.

The damper 3 extends to the maximum length when the door 2 is fully opened (usually at an opening angle of α-75°), and reaches the minimum length when the door is fully closed, and has the characteristics shown in the song LiJaB in Figure 5. The assist force in the door opening direction is maximum when the door is fully opened, and the assist force in the door closing direction is generated when the door is fully closed.

A coil spring 4 is provided inside the end of the door 2 on the hinge side and the flange on the front header LC side, and both ends of the coil spring 4 are extended, and the extension parts 4a and 4b are connected to the inside of the door 2 and the front header LC side. are installed on the respective flange parts.

As shown in FIG. 3, the coil spring 4 has extensions 4a and 4b at an angle θ smaller than the opening angle α when the door is fully opened (for example, θ-60 to 65a) in the unloaded state.
When the door is fully opened, the opening angle of the extensions 4a and 4b is greater than the angle θ, so an assisting force in the door closing direction is generated.

On the other hand, when the door is fully closed, the extensions 4a and 4b are compressed to an angle smaller than θ, and the extensions 4a and 4b are almost in contact with each other, so the assisting force in the door opening direction is maximized.

The characteristics of the coil spring 4 are shown in curve A in FIG.
It becomes a no-load state when the door opening angle is -0-65°), and when the door is fully open, it generates an assisting force in the door closing direction, and when the door is fully open, it generates an assisting force in the door opening direction.

With this configuration, the characteristics of the damper 3 (curve B in Figure 5) and the characteristics of the coil spring 4 (curve A) are added to obtain the door operating force characteristics (curve C), and the door operating force characteristic (curve C) is obtained. When starting the opening operation, the assist force of the coil spring 4 to assist the door opening operation is at its maximum.
The assisting force of the damper 3 in the door closing direction is reduced, and the operating force at the beginning of opening is reduced, thereby lightening the operating force at the beginning of opening.

Next, when the door 2 is opened fully, the assist force of the damper 3 to assist the door opening operation becomes maximum, but since the coil spring 4 generates an assist force in the direction of closing the door, the damper 3 generates an assist force in the direction of closing the door. The operating force decreases and door 2
The brake is released due to this movement, and the fully open position is reached at a slow speed, thereby preventing the door 2 from shaking violently.

Another embodiment will be described with reference to FIG. 4, in which a coil spring 40 is incorporated into the hinge 6 of the door 2.
The hinge 6 has a hinge bracket 61 fixed to the door side and a hinge bracket 62 fixed to the vehicle body side.
A coil spring 40 is wound around a pin 50, and extensions 40a and 40b at both ends of the coil spring 40 are fixed to both hinge brackets 61 and 62 by means of welding 8 or the like. ing.

Reference numeral 7 indicates bolt holes for fixing the hinge brackets 61 and 62 to the door 2 and the vehicle body.

According to this configuration, the entire device becomes compact and looks good.

Although the above embodiments have been described using coil springs, the spring is not limited to coil springs, and torsion bars, plate springs, etc. having the above-mentioned characteristics may also be used.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

When starting to open the door from a fully closed state, the assist force of the spring to assist the door opening operation is at its maximum.
The operating force at the beginning of opening is small, and the opening operation can be performed easily.

Next, when the door is fully opened, the assist force of the damper to assist the door opening operation reaches its maximum, but since the spring generates an assist force in the door closing direction, the door operating force decreases near the fully open position. However, the movement of the door is braked and reaches the fully open position at a slow speed, which prevents the door from shaking violently.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view showing a schematic configuration, Fig. 2 is an enlarged perspective view of the ■ section in Fig. 1, Fig. 3 is an enlarged view of the coil spring, and Fig. 4 is an enlarged perspective view of the section . FIG. 5, which is an enlarged perspective view of the main part of another embodiment, is a characteristic diagram of the operating force'. 1-...Vehicle body, 2...Door, 3...Damper 4.40...Coil springs 4a, 4b; 40a, 40b...Extension part.

Claims (1)

[Claims] (1) A flip-up vehicle door structure includes a damper that provides maximum assisting force when the door is fully opened, and a spring that provides maximum assisting force when the door is fully closed, and the spring moves from the fully open state to fully close the door. A vehicle door structure characterized by being in a no-load state between states.