JPH02102940A - Gas stay of back door for vehicle - Google Patents

Abstract

PURPOSE:To increase the whole gas capacity and eliminate the problem of poor appearance by arranging a gas stay body between a back door and the car body, furnishing an aux. high pressure gas chamber at the back door or the car body, and putting this aux. gas chamber in communication with the gas stay body through a flexible tube. CONSTITUTION:An aux. high pressure gas chamber 7 provided separately from a gas stay body 5 is installed at the back door 3 or the car body 2, and the gas stay body 5 is put in communication with the aux. high pressure gas chamber 7 through a flexible tube 8. This enlarges gas capacity by a portion corresponding to the capacity of the aux. high pressure gas chamber 7 without requiring change in the dimensions of the gas stay body 5, to result in enhancement of the maneuvering easiness when the back door 3 is opened and closed. As connected through flexible tube 18, the aux. high pressure gas chamber 7 can be located in any desired place, for ex. inside the panel of the car body 2 or the back door 3 while only the gas stay body 5 part is exposed, which will prevent impairing fine appearance.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a gas stay that is used in a flip-up back door disposed at the rear end of a one-box type automobile, and in particular relates to a gas stay that is used in a flip-up back door disposed at the rear end of a one-box automobile. To provide a structure in which the capacity of high-pressure gas can be increased without deteriorating the appearance and the operating force at the time of opening and closing can be reduced, and the gas pressure in the cylinder can be easily adjusted due to temperature fluctuations.

[Conventional technology]

The flip-up back door installed at the rear end of a one-box car is equipped with a gas stay to hold the door open and reduce the operating force required when opening and closing. There is. Conventional gas stays installed in such one-box vehicles include those shown in FIGS. 7 and 8.

This gas stay 30 is connected to a side edge of a back door 32 disposed on a rear end surface 31a of the vehicle body 31 and a rear end surface 31a of the vehicle body 31.
A piston 34 is inserted movably in the axial direction into a cylinder 33 filled with high-pressure gas such as nitrogen gas, and a piston rod 35 is inserted into the piston 34. One end 35a of the rod 35 is fixed, and the other end 35b of the rod 35 projects outward in the axial direction of the cylinder 33. Further, the upper end of the cylinder 33 is pivotally supported to the back door 32 via a metal fitting 36, and the other end 35b of the piston rod 35 is pivotally supported to the vehicle body 31 via a pole joint 37.

By the way, the above-mentioned back door is required to improve the operability when opening and closing the back door by hand. In order to improve this operability, it is effective to increase the capacity of high-pressure gas, and for this purpose, it is common to increase the dimensions (diameter, length) of the cylinder.

Furthermore, in order to improve operability, it is necessary to appropriately set the gas pressure within the cylinder. However, since this gas pressure is easily fluctuated due to temperature changes, for example, if the pressure inside the cylinder is set to a pressure suitable for a warm region, when this gas stay is used in a cold region, the gas pressure will drop and the back door may open. The problem is that the state cannot be maintained.

Therefore, gas stays that can adjust the fluctuations in gas pressure caused by the temperature changes have been proposed (for example, Japanese Patent Application Laid-open No. 55-36141, Japanese Utility Model Application No. 57-44).
(Refer to Publication No. 239), this is done by inserting an adjusting member that changes the volume into the cylinder so that it can move forward and backward, or by screwing a camp onto the cylinder body and rotating it to change the volume inside the cylinder. The gas pressure is adjusted by

[Problem that the invention seeks to solve]

However, the conventional method of increasing the volume by making the cylinder longer or thicker is limited by the space for placing the gas stay due to the shape of the car body, and if the cylinder is made larger, it becomes more noticeable and looks bad. There are problems, and therefore there are limits to the improvement of operability.

In addition, the conventional gas stay that can adjust the gas pressure has a structure in which an adjustment mechanism is added to the cylinder that is exposed to the outside, so it looks bad (and the adjustment of the gas pressure is uncomfortable for the operator). Since this is a dependent method, there is a problem in that it takes time and effort to adjust the gas pressure between the two, especially when gas stays are disposed on the left and right sides of the back door.

The present invention was made in order to solve the above-mentioned conventional problems, and it is possible to increase the overall gas capacity without increasing the dimensions of the cylinder, eliminate deterioration in appearance, and easily control the gas pressure inside the cylinder. The purpose of this project is to provide a gas stay for a vehicle back door that can be adjusted.

[Means for solving problems]

Therefore, the invention of item 1 of the present application is a gas stay disposed between a back door attached to an automobile and a vehicle body, in which a gas stay main body is disposed between the back door and the vehicle body, and the gas stay body is disposed between the back door and the vehicle body. It is characterized in that an auxiliary high-pressure gas chamber is provided in the auxiliary high-pressure gas chamber, and the auxiliary gas chamber and the gas stay main body are communicated with each other through a flexible tube.

Further, the invention of item 2 of the present application provides that the secondary high-pressure gas chamber includes an outer cylinder, a piston inserted into the outer cylinder so as to be movable in the axial direction thereof, and a gas pressure adjustment member for moving the piston forward and backward. Further, the invention of item 3 of the present application is characterized in that a scale on which markings are formed to indicate the amount of advance and retreat of the adjustment member is attached to the gas pressure adjustment member.

[Effect]

According to the gas stay for a vehicle back door according to the present invention,
An auxiliary high pressure gas chamber is provided separately from the gas stay main body, and this is placed on the back door or the vehicle body, and the gas stay main body and the auxiliary high pressure gas chamber are communicated with each other through a flexible tube. Since the gas capacity can be increased by the volume of the gas chamber, operability when opening and closing the back door can be improved. In addition, since the secondary high-pressure gas chamber is connected with a flexible tube, the placement location of this secondary gas chamber can be selected arbitrarily.For example, it can be housed in the back door or a panel of the vehicle body, and it can be placed inside the gas stay body. Since only the portion can be exposed to the outside, the appearance will not deteriorate.

In addition, in the invention of item 2 of the present application, a gas pressure adjustment member that can vary the gas pressure in the outer cylinder is provided in the auxiliary high-pressure gas chamber, so that the gas pressure in the auxiliary high-pressure gas chamber and, by extension, in the gas stay main body is controlled by this adjustment member. The pressure can be varied so that fluctuations in gas pressure due to temperature changes can be compensated for. Furthermore, since this adjustment member can be housed in the back door or vehicle body panel together with the auxiliary high pressure gas chamber, the appearance will not be deteriorated in this respect either.

Furthermore, in the invention of item 3 of the present application, since the gas pressure adjusting member is equipped with a scale on which markings are formed to indicate the amount of advance and retreat of the member, anyone can easily adjust the gas pressure to a predetermined level, and the gas pressure can be easily adjusted to the back door. Gas pressure adjustment can be facilitated when two gas stays are installed.

〔Example〕

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

Figures 1 to 6 are diagrams for explaining a gas stay for a back door for a vehicle according to an embodiment of the present invention, and in this embodiment, the case will be explained taking as an example the case where it is applied to the back door of a one-box type automobile. .

In the figure, l is a one-box type car, and the rear end surface of this car body 2 has a wide opening 2 for loading and unloading luggage.
A is formed in the opening 2a, and a flip-up type back door 3 is disposed in the opening 2a.

The upper edge of this back door 3 is pivotally supported by a hinge 4 to the roof panel 2b at the upper edge of the opening 2a, so that the back door 3 can be rotated in the vertical direction to open the opening 2a.
It is configured so that it can be opened and closed. The gas stay main body 5 of this embodiment is disposed between the side edge of the opening 2a and the side edge of the back door 3. In addition, the above vehicle body 2
An auxiliary high pressure gas chamber 7 is disposed within the quarter panel 6, and this auxiliary high pressure gas chamber 7 and the gas stay main body 5 are communicated through a flexible tube 8.

The gas stay main body 5 is mainly composed of a cylinder 9 whose lower end is closed, and a piston rod 10 which projects axially outward from the upper end of the cylinder 9. A mounting bracket 9a is attached to the lower end of the cylinder 9, and this is pivotally supported by a bracket 11a attached to the rear end surface 6c of the quarter panel 6. Further, bearings 12a and 12b are mounted and fixed to the upper end of the cylinder 9 by caulking, thereby forming a main gas chamber A filled with nitrogen gas or the like within the cylinder 9.

Further, a piston 13 is disposed within the cylinder 9 so as to be movable in the axial direction, and the piston 13 is formed with an orifice 13a. One end 10a of the piston rod IO is inserted into the axial center of the piston 13, and tightened with a nut toe. Further, the other end 10b side of the piston rod 10 has a bearing 12.
a, 12-b and extends outwardly, and is pivoted to a Bragg-/)1lb attached to the back door 3.

Note that 14 is a sealing member disposed between the bearings 12a and 12b to seal between the cylinder 9 and the piston rod IO.

Furthermore, a communication hole 9b is formed at the lower end of the cylinder 9, and a communication pipe 15 is welded to the communication hole 9b. The protruding portion of the communicating pipe 15 passes through a small hole 6d formed in the rear end surface 6C of the quarter panel 6 and is located inside the panel 6. It is closed with a seal rubber 17. Further, the communication pipe 15 is provided with a check valve 15a for opening and closing it. Further, the rear end of the flexible tube 8 is connected to the front end of the communication vibe 15 via a diagonal bolt 16a. The flexible tube 8 has bendable flexibility and is made of a high pressure resistant tube. The front end of the flexible tube 8 is connected to the small diameter portion t8a of the auxiliary high pressure gas chamber 7 via a bolt 16b.

The auxiliary high-pressure gas chamber 7 is provided with an outer cylinder 18 filled with high-pressure nitrogen gas, etc., and is movable into and out of the outer cylinder 18, and is sealed with a sealing member 19 between the outer cylinder 18 and the outer cylinder 18. It is composed of a sub-piston 19 and a gas pressure adjusting device 20 that moves the sub-piston 19 forward and backward, thereby controlling the main gas A.
A sub-gas chamber B is formed which communicates with the gas chamber B.

In addition, the above outer cylinder 1B is installed at 218° 21b.
It is fixed to the inner panel 6b in the quarter panel 6 with screws. As a result, the outer cylinder 18 is located between the outer panel 6a and the inner panel 6b and is not visible from the outside. Further, a working opening 28 is formed in a portion of the inner panel 6b facing the adjustment device 20.

The gas pressure adjustment device 20 is composed of an adjustment rod 20a having a thread formed on the outer periphery, and a resin operation handle 20b fixed to the front end of the rod 20a.The adjustment rod 20a is attached to the outer cylinder 18. It is screwed into the insertion hole 22a of the screwed cylinder end member 22. A thrust bearing 23 is also provided at the rear end of the adjustment rod 20a.
is mounted, and the bearing 23 is in contact with the sub-piston 19. As a result, the operation handle 20
The sub piston 19 can be moved forward or backward by rotating the outer cylinder 18.b. As a result, the gas pressure within the cylinder 9 can be changed.

Further, a band-shaped scale 25 is attached to the gas pressure adjustment device 20. Both ends of the scale 25 are bent downward, one end engaging a flange 26 formed on the adjustment rod 20a, and the other end located on the upper surface of the cylinder end member 22. Further, a support plate 27 bent into a hat shape is fixed to the upper surface of the end member 22 with screws so as to surround the upper surface of the scale 25. This allows the scale 25 to move forward and backward as the adjustment member 20 rotates. Further, a reference mark a is provided on the front edge of the support plate 27.
In the longitudinal direction of the upper surface of the scale 25, markings indicating temperature are formed at approximately equal intervals from the front end to the rear end. That is, the adjustment rod 2
At the time of extension of 0a, the scale 25 is placed on the reference mark 93 part.
The temperature is 40°C (summer), when the rod 20a is inserted to the center, it is 20°C (spring, autumn), and when it contracts, it is -10°C (
The scale is formed so that the winter) is located.

Next, the effects of this embodiment will be explained.

Gas stay main body 5 of this embodiment. When connecting the auxiliary high pressure gas chamber 7, fill the cylinder 9 with nitrogen gas or the like to a higher pressure than the predetermined gas pressure, and in this state, check the check valve 15a.
Close it and fill it with gas.

Next, this gas stay main body 5 is attached to the back door 3 side, and the auxiliary high pressure gas chamber 7 is attached to the inner panel 6b. After the rear end of the flexible tube 8 is screwed onto the communication pipe 15 of the cylinder 9, the front end of the tube 8 is screwed onto the small diameter portion 18a of the outer cylinder 18. After that, the check valve 15a is opened. Thereby, the gas in the cylinder 9 flows into the outer cylinder 18, and a predetermined gas pressure is obtained. The check valve 15a is provided so that the gas stay main body 5 and the auxiliary high pressure gas chamber 7 can be installed separately and connected later. In other words, if these are preset in a gas-filled state and then installed, this is to avoid the problem that would occur if the through hole in the quarter panel had to be enlarged.

According to this embodiment, the cylinder main body 5 is disposed between the back door 3 and the vehicle body 2, and the auxiliary high pressure gas chamber 7 is separately installed in the quarter panel 6, and both are connected using a flexible tube. 8, the gas capacity can be increased by the volume of the auxiliary high pressure gas chamber 7 without changing the dimensions of the cylinder body 5, and the operability when opening and closing the back door 3 can be improved. Furthermore, since the flexible tube 8 is used for communication, the auxiliary gas chamber 7 can be accommodated within the quarter panel 6, which is not visible from the outside, thereby eliminating the problem of poor appearance.

Furthermore, in this embodiment, a gas pressure adjustment device 20 is provided in the secondary high pressure gas chamber 7, and is rotated to move the secondary piston 19 forward and backward, so that when it is desired to change the gas pressure,
By rotating the adjustment handle 20b from the working hole 28 in the vehicle interior, the volumes inside the outer tube 18 and the cylinder 9 can be varied, and fluctuations in gas pressure due to excessive changes can be compensated for. In this case, even if the adjustment rod 20a rotates, the sub-piston 19 only moves in the axial direction and does not rotate, so that the sealing performance can be improved.

Furthermore, since a scale 25 is attached to the adjustment rod 20a so that the amount of movement of the rod 20a can be visually observed, the gas pressure can be easily adjusted to a predetermined value.

In the above embodiment, the 011 high-pressure gas chamber 7 is housed in the quarter panel 6, but in the present invention, the sub-high-pressure gas chamber 7 does not necessarily need to be placed inside the panel.In short, it is necessary to place the auxiliary high-pressure gas chamber 7 in a place that cannot be seen from the outside. For example, it may be provided on the back door 3 side.

Further, in the above embodiment, the case where the cylinder 9 and the auxiliary high pressure gas chamber 7 were communicated was explained as an example, but in the present invention,
It is also possible to form a communication hole in the piston rod that communicates with the inside of the cylinder, and to communicate this communication hole with the auxiliary high-pressure gas chamber.

〔Effect of the invention〕

As described above, according to the gas stay for a vehicle back door according to the invention of item 1 of the present application, the auxiliary high pressure gas chamber is provided in the back door or the vehicle body separately from the gas stay main body, and the two are communicated with each other by a flexible tube. It is possible to increase the gas capacity without changing the dimensions of the main body, improve operability when opening and closing, and eliminate deterioration in appearance.

Further, in the invention set forth in item 2 of the present application, a gas pressure adjustment member that can vary the gas pressure in the outer cylinder is disposed in the auxiliary high pressure gas chamber, and further, in the invention set forth in item 3 of the present application, the adjustment member is provided with a gas pressure adjusting member that can vary the gas pressure in the outer cylinder. Since a scale is attached to indicate the amount of advance and retreat of the gas, the gas pressure can be changed in accordance with temperature changes, and the gas pressure can be easily set to a predetermined value.

[Brief explanation of drawings]

1 to 6 are diagrams for explaining a gas stay for a one-box type automobile according to an embodiment of the present invention,
Figure 1 is a schematic configuration diagram showing the gas stay attached to the one-box vehicle, Figure 2 is a sectional view showing the connection between the gas stay main body and the auxiliary high pressure gas chamber, and Figure 3 is the auxiliary high pressure gas chamber. 4 is a side view showing the scale installed, FIG. 5 is a perspective view showing the scale, FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 1, and FIG. FIG. 8 is a side view and a cross-sectional view, respectively, for explaining a gas stay employed in a conventional back door. In the figure, ■ is a one-box type car, 2 is a car body, and 3 is a one-box type car.
is the back door, 4 is the hinge, 5 is the gas stay body, 6 is the quarter panel (panel), 7 is the secondary high pressure gas chamber, 8 is the flexible tube, 18 is the outer cylinder, 19 is the secondary piston (
20 is a gas pressure adjustment device, and 25 is a scale.

Claims (3)

[Claims] (1) In a gas stay disposed between the vehicle body and a flip-up back door attached via a hinge to the rear end of the vehicle body, the gas stay main body is disposed between the back door and the vehicle body. A gas stay for a back door for a vehicle, characterized in that an auxiliary high-pressure gas chamber is disposed in the back door or a panel of the vehicle body, and the gas chamber and the gas stay body are communicated through a flexible tube. (2) In a gas stay disposed between the vehicle body and a flip-up back door attached via a hinge to the rear end of the vehicle body, the gas stay main body is disposed between the back door and the vehicle body. A secondary high-pressure gas chamber is provided in the back door or a panel of the vehicle body, and the gas chamber and the gas stay main body are communicated with each other by a flexible tube, and the secondary high-pressure gas chamber is connected to the outside filled with high-pressure gas. A gas stay for a back door for a vehicle, comprising a cylinder, a piston inserted into the outer cylinder so as to be movable in the axial direction of the cylinder, and a gas pressure adjusting member for moving the piston forward and backward. (3) In a gas stay disposed between the vehicle body and a flip-up back door attached via a hinge to the rear end of the vehicle body, the gas stay main body is disposed between the back door and the vehicle body. A secondary high-pressure gas chamber is provided in the back door or a panel of the vehicle body, and the gas chamber and the gas stay main body are communicated with each other by a flexible tube, and the secondary high-pressure gas chamber is connected to the outside filled with high-pressure gas. It consists of a cylinder, a piston inserted into the outer cylinder so as to be movable in the axial direction of the cylinder, and a gas pressure adjusting member for moving the piston forward and backward. A gas stay for a back door of a vehicle, characterized in that markings are formed to indicate the amount of advance and retreat of an adjustment member.