JPH10287274A - Opening and closing control device of back door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily stop a back door at an optional opening by using a stay damper having no lock mechanism as one of support members of the back door, and a free lock having a lock mechanism as the other support member, and extending and contracting the free lock by a lock releasing means provided on the back door side or a body side. SOLUTION: One of support members of a back door BD is energized in opening direction by a stay damper, and a free lock FL lockable in an optional length is used for the other. Upper and lower chambers A, B formed in a cylinder 102 by a piston 108 in the free lock FL are filled with operating oil, and isolated from a gas chamber C by a free piston 106. When an operation lever 113 is rotated clockwise to move the plunger 111 of the piston 108 upward through a push rod 107, the lower chamber B is allowed to communicate with the upper chamber A through a piston port 108A, and the piston rod 101 is extended. The operation lever 113 is mounted on a support shaft 112B so as to be easily operable by one hand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a back door opening / closing control device using two support members utilizing gas reaction force.

[0002]

2. Description of the Related Art In recent years, most vehicles having a back door BD as shown in FIG. 3 (C) provide a small amount of damping force in the vicinity of the extended end to assist the opening / closing force of the back door BD. The stay damper SD in which the lubricating oil 12 is sealed is used. Fig. 3 shows the structure of the stay damper SD.
Explaining in (A), a non-return valve 7 and a piston 8 that are vertically movably guided by a valve stopper 6 and a rear cylindrical portion of the piston 8 are inserted into a lower end spigot portion 1A of the piston rod 1, and a piston nut 9 is provided. Has been concluded. The piston 8 is housed in the cylinder 2 so as to be vertically movable,
The interior of the cylinder is defined by a piston 8 into an upper chamber A and a lower chamber B.

The piston rod 1 is slidably guided by a rod guide 3 fixed to the lower end of a cylinder 2, and seals a lower chamber B with a seal 4. The sealing of the gas and the lubricating oil 12 into the cylinder is performed via the plug 13, and after sealing, the mounting member 10 is completely sealed by welding. The stopper 5 is fixed to the cylinder 2 by tightening the outer surface center portion, and restricts the maximum extension of the stay damper by abutting the valve stopper 6 when the piston rod 1 extends. Here, piston rod 1
Is a repulsive force calculated by a product of the cross-sectional area of the piston rod itself and the gas pressure of the upper chamber A, and is constantly urged in the extension direction.

The piston 8 is provided with a piston port 8A for communicating the upper chamber A and the lower chamber B, and a rear seat surface 8B provided below the piston port 8A has
A non-return valve 7 having an orifice 7A for regulating a communication area between the piston upper and lower chambers when the piston rod 1 is extended is seated. When the piston rod 1 contracts, the non-return valve 7 rises from the rear seat surface 8B, and the entire gap between the rear seat surface 8B and the non-return valve 7 has an opening area larger than the piston port 8A. Is the area of the orifice 7A during expansion and the area of the piston port 8A during contraction.

As shown in FIG. 3 (B), if the piston rod 1 is attached to the vehicle such that the piston rod 1 is at the lower side when the back door is closed, the lubricating oil 12 stays in the lower chamber B. The piston 8 is gradually immersed in the lubricating oil 12 so as to cover the orifice 7A, and the lubricating oil 12 remaining on the lower chamber B side when the back door is closed passes through the orifice 7A from the lower chamber B to the upper chamber. Move to room A. Since the passage resistance when the lubricating oil 12 passes through the orifice 7A is larger than that when the gas passes through the orifice 7A due to the difference in the viscous resistance, the opening speed near the extended end becomes a buffered gentle speed, The impact at the extended end is reduced.

[0006]

When shifting from the closed position indicated by the solid line to the open position indicated by the virtual line in FIG.
The piston 8 is gradually immersed in the lubricating oil 12 to generate a damping force, and the door is opened at a slow speed. However, the piston 8 cannot be stopped at an arbitrary opening corresponding to the height of the operator who opens and closes the door. Therefore, for an operator who is short, the back door B
It was sometimes difficult to close D. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an opening / closing control device capable of stopping a back door BD at an arbitrary opening.

[0007]

In order to solve the above-mentioned problems, the present invention adopts a method that employs one of a pair of support members utilizing a gas reaction force for supporting a back door of a vehicle. In addition to using a stay damper without a mechanism and a free lock that right the lock mechanism on the other side, the free lock is expanded and contracted by a lock release means arranged on the back door side or the vehicle body side so that the back door can be stopped at an arbitrary opening degree. What I did ".

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The most important feature of the present invention is that FIG.
One of the two support members utilizing the gas reaction force for supporting the back door BD as shown in FIG. 1C urges the back door BD in the opening direction by using a conventional stay damper SD, On the other hand, the back door BD can be stopped at an arbitrary opening by using a free lock FL capable of urging the back door BD in the opening direction and locking the door at an arbitrary length. .

Since the stay damper SD has already been described in the prior art, the structure of the free lock FL according to the first embodiment of the present invention will be described with reference to FIG. A seal 11 is provided at the upper end of the piston rod 101.
0 is inserted, and the piston 10 is inserted.
8 are joined by tightening the small-diameter cylindrical portions at several places 108B. The piston 108 is the cylinder 10
The upper and lower chambers 2 and 3 define an upper chamber A and a lower chamber B inside the cylinder.

The piston rod 101 is connected to a cylinder 102
The lower chamber B is sealed by a seal 104 while being slidably guided by a rod guide 103 fixed to the lower end of the lower chamber B. The upper chamber A and the lower chamber B are filled with hydraulic oil, are isolated from the gas chamber C by a free piston 106 accommodated in the cylinder 102, and are pressurized by the pressure of the gas chamber C. The gas is charged into the gas chamber C through the plug 13 and the mounting member 10 is filled after the gas is filled.
Is completely sealed by welding.

The piston 108 has an upper chamber A and a lower chamber B
And a plunger 111 is inserted into a hollow hole 108C provided inside the piston port 108A, and the upper chamber A of the upper chamber A which is substantially equal to the sealed gas pressure of the gas chamber C is formed. The piston is urged toward the piston rod by the pressure, and the large-diameter portion 111A engages with the seal 109 to shut off the upper chamber A and the lower chamber B.
In this state, since the lower chamber B is in a so-called oil lock state, the piston rod 101 cannot expand and contract, so that the back door BD cannot be opened and closed.

In this state, the operating lever 113 is rotated clockwise to rotate the plunger 1 through the push rod 107.
11 by moving the plunger 111 upward.
The small-diameter portion 111B extends through the seal 109, and the lower chamber B and the upper chamber A communicate with each other via the piston port 108A. As a result, the piston rod 101 is extended by a repulsive force obtained by multiplying the sectional area of the piston rod 101 by the pressure of the upper chamber A. When the operating lever 113 is released, the plunger 111 returns to the illustrated oil lock state by the pressure of the upper chamber A and the communication between the upper and lower chambers is interrupted, so that the back door BD stops at that position.

Since one of the stay dampers SD always urges the door in the opening direction, the other free lock FL is used.
If only the operation lever 113 is opened and closed, the door can be stopped at an arbitrary opening. The operation lever 113 is provided on the support shaft 1 disposed on the attachment member 112 for attaching to the back door BD.
By attaching to 12B, it can be easily operated with one hand.

In the above description, the case where the operation lever 113 is attached to the support shaft 112B provided separately from the attachment shaft 112A of the back door BD of the free lock FL has been described. As shown in FIG. , Operation lever 21
3 is the mounting axis 1 of the back door BD of the free lock FL
A similar effect can be obtained when the device is rotatably mounted on 12A. In this case, the outer shape near the mounting shaft 112A of the operation lever 213 is formed in a cam shape, and the plunger 111 is moved up and down via the push rod 107 by rotating the operation lever 213 clockwise.
The opening and closing of the back door BD is controlled.

Further, instead of the above-mentioned operating lever for directly mechanically moving the push rod vertically, as shown in FIG. 1 (C), one end of the free lock FL is attached to the attaching member 112 to the back door BD. The push rod 107 is attached by a push button 313A attached to the vehicle body or the back door BD via a wire 313B accommodated inside the cable wire 313 attached to the back door or the vehicle body at the multi-end.
Can be indirectly moved up and down to control the opening and closing of the back door BD.

Next, when an operation of stopping the back door at an arbitrary opening is considered, it is conceivable that the operation of stopping is mostly performed when the back door is opened. No locking mechanism for closing the door is required. In addition, even when the back door is opened, it is considered that the section that stops at an arbitrary opening degree is sufficient as long as the range is equal to or more than a certain opening degree. In this case, the section from the closed state to the certain opening degree is considered. No lock mechanism is required.

The second embodiment of the present invention shown in FIG. 2 shows a structure capable of meeting the above two requirements. First, for the first use, the piston 208 is provided with a known check valve CV that is opened when the differential pressure between the upper chamber A and the lower chamber B exceeds a set value when the piston rod 101 contracts, The movement of the hydraulic oil from the lower chamber B to the upper chamber A is free, and the lock mechanism does not operate in the direction in which the piston rod 101 contracts without rotating the operation lever 113.

Next, for the second application, a part of the inner diameter is bulged outward in a groove shape in the cylinder 202 of the free lock FL corresponding to a section from the closed state of the back door to a certain opening degree. An enlarged diameter groove 202A is provided, and in this section, the enlarged diameter groove 202A
And the lower chamber B, so that the lock mechanism does not work.

As described above, one of the stay dampers SD for supporting the back door BD always urges the door in the opening direction, so that various functions can be added to the other free lock FL to provide various functions. We can respond to requests.

[0020]

As described above, according to the present invention, one of the two supporting members utilizing the gas reaction force for supporting the back door BD is opened in the direction of opening the back door by using the conventional stay damper SD. The conventional technology of using a free lock FL which can urge the back door in the opening direction and lock the arbitrarily length while using the free lock FL on the other side makes it possible to reliably and inexpensively operate the back door. Can be stopped at an arbitrary opening.

Further, since one of the stay dampers SD always urges in the direction of opening the door, if only the other free lock FL is opened and closed by the operation lever or the push button, the back door can be opened at an arbitrary opening and one hand. Can be easily stopped.

Further, by adding to the other free lock FL a means for disabling the lock mechanism in the section from the door closing direction or the closed state to a certain opening degree, one-handed and easy to meet the operator's request. The opening and closing control device of the back door can be stopped at an arbitrary opening.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of a free lock according to a first embodiment of the present invention. (B) Another embodiment of the free lock operation lever.

FIG. 2A is a longitudinal sectional view of a free lock according to a second embodiment of the present invention.

FIG. 3A is a longitudinal sectional view of a stay damper according to the related art. (B) It is explanatory drawing of the attached state to a back door of a stay damper. (C) It is explanatory drawing which shows the movement of the lubricating oil in a stay damper accompanying opening and closing of a back door.

[Explanation of symbols]

 A Upper chamber B Lower chamber CV Check valve BD Back door SD Stay damper FL Free lock 107 Push rod 102, 202 Cylinder 202A Expansion groove 208 Piston 112, 212 Mounting member 113, 213 Operation lever 313 Wire cable 313B Push button

Claims (5)

[Claims] 1. A support member using a gas reaction force for supporting a back door of a vehicle using a stay damper without a lock mechanism on one side and a free lock on a right side of the lock mechanism on the other side. A back door opening / closing control device characterized in that the back door can be stopped at an arbitrary opening degree by expanding and contracting by a lock releasing means arranged on the back door side or the vehicle body side. 2. The back door according to claim 1, wherein the unlocking means is an operation lever mounted on a member to be attached to the back door side of the free lock and moving the free lock push rod up and down. Opening and closing control device. 3. An unlocking means is mounted at one end on a mounting member of the free lock on the back door side facing the push rod, and has a multi-end free by a wire cable attached to the back door or the vehicle body. 2. The back door opening / closing control device according to claim 1, wherein the push button is a push button for vertically moving a lock push rod. 4. A support member utilizing a gas reaction force for supporting a back door of a vehicle, wherein a stay damper without a lock mechanism is used on one side and a free lock having a lock mechanism is used on the other side. A back door in which a check valve that opens in the piston from the upper chamber to the lower chamber with a constant pressure difference is accommodated, and the lock mechanism does not work when the free lock operates in a contracting direction. Opening and closing control device. 5. A support member using a gas reaction force for supporting a back door of a vehicle, wherein a stay damper without a lock mechanism is used on one side, and a free lock having a lock mechanism is used on the other side. In the free-lock cylinder corresponding to the section from the closed state to a certain degree of opening, a bulging groove that connects the upper chamber and the lower chamber across the piston part is formed so that the lock mechanism in the above section does not work. A back door opening / closing control device, characterized in that: