JPH0248224A - Installing structure of gas stay of back door - Google Patents

Abstract

PURPOSE:To reduce operating force for closing by a method wherein first and second links are provided freely oscillatable with a horizontal gap either on a body or on a back door and a third vertical link is used to connect both links to have one end of a gas stay connected. CONSTITUTION:A gas stay 7 is mounted between a swing back door 4 provided freely openable via a hinge 5 on the rear of a vehicle body and the body. A first link 12 and a second link 13 are attached to either the body or to the back door with a vertical gap, both links 12, 13 are connected by a third link 14 extending vertically to have one end of the gas stay 7 connected, and the other end of the gas stay 7 is connected to either the body or the back door 4 freely swingable. As the back door is closed, the junction of the gas stay is gradually moved, reducing resilient moment by the corresponding amount to permit operating force for closing to be decreased while a holding force at the time of fully opening the door is maintained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mounting structure for a gas stay employed in a second flip-up back door of an automobile, and in particular, a structure that maintains the flip-up force when fully opened while maintaining the closing operation force. This invention relates to an improvement in the mounting structure of a gas stay that makes it possible to reduce the amount of gas.

[Conventional technology]

A gas stay is attached to the flip-up back door of an automobile to reduce the force required for opening and closing the door and to maintain the door in a fully open state. This gas stay is configured so that a certain repulsion force can be obtained by filling the cylinder with high pressure gas. Conventionally, as shown in FIG. 5, the upper end 21a of the gas stay 21 is attached to the back door 22, and the other end 21b
Generally, it is fixedly and rotatably connected to the vehicle body 23.

In terms of structure, this installation requires a repulsion moment corresponding to the product of the repulsion force F of the gas stay 21 and the perpendicular distance ff1l (arm length) from its axis to the position of the hinge 22a of the back door 22; It is considered that the dead weight moment corresponding to the product of the dead weight W of the door and the right angle path 1I112 from the center of gravity of the door to the hinge position is balanced. By the way, from the fully open state of the door to a predetermined angle (
In this example, in the range of θ), the arm length is 11. Although j2 hardly changes, the repulsive force F of the gas stay is at its minimum at the maximum stroke and increases as it contracts. Therefore, as shown by the dashed line in Fig. 4, the repulsion moment due to the gas stay increases as the door is closed from the fully open state.
- The self-weight moment tends to increase once and then decrease, and as shown by the broken line in the same figure, the narrower the opening, the smaller the self-weight moment becomes.

Therefore, in the conventional structure described above, the operating force, which is the difference between the repulsion moment and the self-weight moment, also becomes heavier.
As a result, it gives an impression of poor operability.

In addition, in such gas stays, the repulsion force tends to increase as the ambient temperature rises. For example, if it is used in a place where the temperature is significantly higher than the set conditions, the repulsion moment becomes excessive and the closing operation force becomes abnormally high. Therefore, the operability may deteriorate from this point as well.

A gas stay mounting structure that attempts to solve the above problem is described in Japanese Utility Model Application Publication No. 182327/1983. This allows the door connection position of the gas stay to be adjusted. For example, if the closing force of the door is excessive, the door connection position is moved to the door hinge position and fixed at that position. ing.

[Problem that the invention seeks to solve]

However, since the mounting structure described in the above publication is a structure in which the door connection position is moved and fixed at that position, for example, when the door is moved to the hinge position side as described above, the moment due to the repulsive force is completely absorbed. There is a problem in that the door opening degree decreases, and therefore the door holding force when fully opened also decreases, and furthermore, the fact that the closing operation force increases once from the fully open state cannot be solved.

The present invention has been made in view of the above-mentioned conventional problems.
The objective is to provide a gas stay mounting structure for a back door that can reduce the closing operation force while maintaining the holding force when fully opened as before.

[Means for solving problems]

The present invention provides a structure for attaching a gas stay between the vehicle body and a flip-up back door that is attached to the rear of the vehicle body via a hinge so as to be openable and closable via a hinge. The second links are vertically spaced apart and swingably attached, both links are connected by a third link extending in the vertical direction, one end of the gas stay is connected to the third link, and the other end of the gas stay is connected to the third link. It is characterized in that it is connected to either the vehicle body or the back door.

Here, the link mechanism of the present invention may be provided on either the vehicle body side or the back door side, but in either case, it is necessary to arrange it so that the gas stay is held in an extended state. Therefore, when the link mechanism is installed on the vehicle body side, the connection point between the back door and the link mechanism lowers as the door is closed, and when the link mechanism is installed on the door side, the connection point is lower than when the connection point is fixed. It is necessary to form it so that it rises.

[Effect]

According to the gas stay mounting structure according to the present invention, since the gas stay is connected to the vehicle body or the back door via the link mechanism consisting of the first to third link plates, the connection point of the gas stay changes as the back door is closed. As a result, the gas stay is held in a more extended state than before, and the repulsive force of the gas stay is reduced accordingly. As a result, the closing operation force from fully opening does not increase as in the conventional case, but decreases after maintaining the same size, improving operability.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 are diagrams for explaining a gas stay mounting structure for a back door in an automobile according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a one-box type automobile in which the structure of this embodiment is adopted, and a door opening 3 is formed in the rear end wall 2 of the automobile 1, and a back door for opening and closing the opening 3 is formed in the rear end wall 2 of the automobile 1. 4 is installed.

This back door 4 has a hinge 5 at its upper end and a roof 6.
It is a flip-up type that is pivotally supported so that it can rotate up and down.

A gas stay 7 of this embodiment is disposed between the back door 4 and the edge of the opening 3. This gas stay 7 is formed by slidably inserting a piston rod 9 having a piston fixed to its tip into a cylinder 8.

The upper end 8a of the gas stay 7 is connected to the back door 4.
The lower end 9a is connected to a link mechanism IO. This link mechanism 10 has a base plate 11 bolted and fixed to the edge of the opening 3 in the vertical direction, and a first link plate 1 to the upper end of the plate 11.
2, and a second link plate 13 which is longer than the second link plate 13 is connected to the lower end of the link plates 12 and 1 so as to be swingable.
The third link plate 1 extends vertically between the right ends of 3.
4, the left ends are rotatably connected with a narrower interval between them. The lower end 9a of the gas stay 9 is connected to the upwardly projecting end of the third link plate 14 via a connecting pin 15, so that the gas stay 9 can swing in the vehicle width direction.

Next, the effects of this embodiment will be explained.

As mentioned above, when a back door equipped with a gas stay is closed from a fully open state, the moment of repulsion increases (see point 1IvA in Figure 4), which increases the operating force and reduces operability. There was a problem. On the other hand, in the gas stay mounting structure of this embodiment, the connection point A of the gas stay 7 on the vehicle body side moves to the lower position A' as the back door 4 closes. Therefore, above the gas stay 7,
The contraction amount of the distance S between the lower connecting points (corresponding to the maximum stroke of the gas stay) is suppressed by S' due to the movement of the connecting points, and the increase in repulsive force can be suppressed to that extent. As a result, the repulsion moment of this embodiment decreases without increasing, as shown by the solid line in FIG. 4, and as a result, the closing operation force becomes lighter and operability can be improved.

Note that the interrelationships such as the lengths of the first to third link plates 12 to 14 in the link mechanism of the present invention are not limited to the above-mentioned embodiments. It may be selected as appropriate to move to a position according to the operating force characteristics.

Further, in the above embodiment, the link mechanism 10 is provided on the vehicle body side, but it may also be provided on the door side. In this case, the connection point between the link mechanism and the gas stay will change as the door closes. It is necessary to configure the link mechanism so that it can be held at a higher location than in the case of a conventional structure in which the position of the connection point is fixed.

〔Effect of the invention〕

As described above, according to the gas stay mounting structure according to the present invention, one end of the gas stay is connected to the door or the vehicle body via the link mechanism, so the connection position of the gas stay changes with the closing operation, and the repulsion moment increases accordingly. As a result, the closing operation force can be reduced without reducing the full-open holding force.

[Brief explanation of the drawing]

1 to 4 are diagrams for explaining a gas stay mounting structure according to an embodiment of the present invention, in which FIG. 1 is a side view of the link mechanism portion thereof, and FIG. 2 is a schematic diagram showing its operation. Fig. 3 is a side view of the back door of an automobile in which this structure is adopted, Fig. 4 is a door opening-moment characteristic diagram to explain its effects, and Fig. 5 shows a conventional gas stay mounting structure. FIG. In the figure, l is a car, 2 is the rear end of the vehicle body, 4 is a back door, 5 is a hinge, 7 is a gas stay, 12° 13 is a first.
The second link 14 is the third link. Patent Applicant Daihatsu Motor Co., Ltd. Agent Patent Attorney Tsutomu Shimofu

Claims (1)

[Claims] (1) In a structure for attaching a gas stay between the flip-up back door attached to the rear of the vehicle body via a hinge so as to be openable and closable, and the vehicle body, the first and second gas stays are attached to either the vehicle body or the back door. Two links are vertically spaced apart and swingably attached, and the two links are connected by a third link extending in the vertical direction, one end of the gas stay is connected to the third link, and the other end of the gas stay is connected to the third link. A gas stay mounting structure for a back door, characterized in that it is rotatably connected to either the vehicle body or the back door.