JPH0737746U - Back door opening and closing mechanism of automobile - Google Patents

Abstract

(57) [Summary] [Purpose] The holding force can be maximized when the back door is fully opened, and it can be in a compact state when the back door is fully closed and fully opened. (EN) Provided is a back door opening / closing mechanism capable of improving and assembling accuracy. [Structure] Door side link member 6 and vehicle body side link member 8
And a damper stay 11 having an upper end rotatably connected to a longitudinal intermediate portion of the door-side link member 6, and when the back door 1 is fully closed and fully opened, the respective constituent elements are substantially on the same straight line. It is configured to be arranged along
The bracket B2 supporting the lower ends of the vehicle body side link member 8 and the damper stay 11 is formed with an elongated hole 13 for adjusting the bracket mounting position, and an opening portion of the vehicle body is formed at an intermediate portion or an upper portion of the vehicle body side link member 8 in the longitudinal direction. A spacer (14) that can contact the side edge is attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a back door opening / closing mechanism for an automobile, in which a damper stay expands / contracts in accordance with opening / closing movement of the back door, and more particularly to a mounting structure thereof.

[0002]

[Prior art]

 As an opening / closing mechanism of a back door mounted on an automobile, for example, as shown in FIG. 12, an opening / closing fulcrum 53, 53 of a back door 52 is provided near an upper edge of an opening 51 at the rear of a vehicle body 50. A configuration in which damper stays 54, 54 are interposed between the vehicle and the vehicle body 50 is generally known.

The damper stay 54 has a cylinder 54 a filled with compressed gas and a piston rod 54 b held by the cylinder 54 a so as to be able to move back and forth. The upper end of the damper stay 54 is supported on the inner side surface of the back door 52. It is rotatably connected via a shaft 52a, and its lower end is rotatably connected to a side edge of the opening 51 of the vehicle body 50 via a support shaft 50a.

The damper stay 54 is expanded due to the opening movement of the back door 52, so that the gas in the cylinder 54a expands and the pressure decreases. However, the gas pressure at the time of this decrease Therefore, it is necessary to securely support the back door 52 in the fully open position. For this reason, the gas pressure in the cylinder 54a in the non-fully opened state must be made higher than necessary.

[0005]

[Problems to be Solved by the Invention]

 By the way, the operating force of the back door 52, that is, the force required to close the back door 52 due to the change state of the gas pressure of the damper stay 54 as described above, is represented by a characteristic curve A shown in FIG. It becomes maximum at a predetermined position A1 during the opening / closing operation, and decreases at the time A2 when the fully opened state is reached.

Therefore, when the back door 52 is closed, there is a problem that the operating force becomes maximum and heavy at the midpoint A1 and the smooth closing operation is hindered.

Further, with the above-described characteristics, the back door 52 may be stopped at an arbitrary position within a predetermined range during opening / closing by, for example, reducing the operating force to zero within a predetermined range during opening / closing. If so, the holding force at the fully open position becomes zero or less, which causes a problem that the back door 52 cannot be maintained in the fully open state.

Japanese Utility Model Laid-Open No. 58-54322 discloses a structure in which one end of a damper stay is indirectly connected to a back door via two link members and the other end is connected to a vehicle body. ing. Specifically, as shown in FIG. 14, a damper stay (a gas stick link in the publication) S having a lower end connected to the vehicle body B and a lower end connected to the vehicle body B at one longitudinal end thereof. Of the vehicle body side link BL is connected to the other end of the door side link DL whose one end is connected to the back door D 1.

According to such a configuration, even if the angle formed by both links BL and DL and the angle formed by the damper stay S when the back door D is fully closed are set to be somewhat small, As shown in 15, these angles increase with the opening of the back door D. Then, the angle formed by the damper stay S and the vehicle body side link BL at the time of full opening is close to 90 degrees.

Therefore, judging from the change state of the gas pressure of the damper stay S as described above, the largest operation force (holding force) cannot be obtained when the back door D is fully opened. The operation becomes heavy during the closing of the back door D, or the back door cannot be stopped at an arbitrary position during the opening / closing operation.

Further, according to the configuration disclosed in the publication, the connecting portion of the damper stay S to the vehicle body B is arranged forward from the back door D with a long distance, and moreover, the vehicle body B of the vehicle body side link BL. To the vehicle body B of the damper stay S is arranged above and spaced apart in the longitudinal dimension.

Therefore, when the back door D is fully closed and fully opened, the links BL and DL and the damper stay S are not in a compact state, and a space problem occurs at the rear part of the vehicle body. .

In addition, as described above, when the combination of the link mechanism and the damper stay is adopted, the assembling error of each link member, the variation in the original length of the damper stay at the maximum extension, etc. This greatly affects the opening / closing operation of the door and the change characteristics of the operating force.

Therefore, if these are not assembled correctly, smooth opening / closing operations are hindered, or desired operating force characteristics cannot be obtained, and the like, and vice versa. In order to perform the attachment, it is necessary to perform a troublesome and complicated work, resulting in deterioration of workability.

The present invention was devised under the circumstances described above, and it is possible to maximize the holding force when the back door is fully opened, and it is compact when the back door is fully closed and fully opened. It is an object of the present invention to provide a back door opening / closing mechanism that can be brought into a state and can improve workability at the time of assembling and assembling accuracy.

[0016]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention takes the following technical means.

That is, the invention according to claim 1 of the present application is a vehicle back structure in which the damper stay expands and contracts as the back door having the opening and closing fulcrum near the upper edge of the opening at the rear of the vehicle body opens and closes. In the door opening and closing mechanism, one end is rotatably connected to the back door, the other end is rotatably connected to the vehicle body, and the upper end is rotatably connected to the other end of the door side link member. The linked body side link member and the lower end are rotatably coupled substantially coaxially with the lower end coupling portion of the body side link member described above, and the upper end is rotatably coupled to the longitudinal intermediate portion of the door side link member. And a damper stay connected to each other, and the door-side link member, the vehicle-body-side link member, and the damper stay are arranged along substantially the same straight line when the back door is fully closed and fully opened. Also The lower ends of the vehicle body side link member and the damper stay are rotatably supported by a bracket attached to the vehicle body, and a long hole for adjusting the bracket attachment position is formed in the bracket along the side edge of the opening. In addition, a spacer that can come into contact with the side edge of the opening is attached to an intermediate portion or an upper portion in the longitudinal direction of the vehicle body side link member.

Further, the invention described in claim 2 of the present application has a door side link member, a vehicle body side link member, and a damper stay, similarly to the automobile back door opening and closing mechanism according to claim 1. However, in the configuration in which the door-side link member, the vehicle-body-side link member, and the damper stay are arranged along substantially the same straight line when the back door is fully closed and fully opened, the vehicle-body-side link member and the damper stay are arranged. A lower end of the vehicle is rotatably supported by a bracket attached to the vehicle body, and a connecting position adjusting mechanism for adjusting the connecting position of the vehicle body side link member and / or the damper stay to the bracket in the longitudinal direction is provided. It is characterized by that.

[0019]

[Function and effect of device]

 The basic structure of the back door opening / closing mechanism according to the present invention is that the upper end of the damper stay is connected to the longitudinal intermediate portion of the door side link member, and the lower end of the damper stay and the lower end of the vehicle body side link member are substantially coaxial. It was linked to. The door-side link member, the vehicle-body-side link member, and the damper stay are configured to be arranged along substantially the same straight line both when the back door is fully closed and when the back door is fully opened. .

Specifically, when fully closed, the door-side link member and the vehicle-body-side link member are in a folded state with the connecting portion between the two as a fulcrum, while both link members gradually move along with the opening of the back door. It is expanded and when fully opened, it is in the expanded state and arranged along a substantially straight line.

Therefore, when the back door is fully opened, the connecting portions of the door side link member and the vehicle body side link member to the back door and the vehicle body, the connecting portions between the two link members, and the door side link of the damper stay. The connecting portion to the member will be substantially aligned.

As a result, even if a force in the closing direction acts on the door-side link member from the back door, both link members are in a state in which it is difficult to rotate about the connecting portion between them, and this state is Since it is maintained by the action of gas pressure, the holding force for holding the back door in the fully open position becomes large as a result.

As described above, according to the basic configuration of the present invention, the form of both link members when the back door is fully opened is effectively utilized to enhance the holding force at the fully opened position of the back door. Therefore, it becomes possible to maximize the holding force at this fully open position after reducing the operating force at other positions. Therefore, when the back door is closed, the problem that the closing operation becomes heavy at a predetermined position after the closing operation is started does not occur. In addition, when the back door is fully opened and fully closed, both link members and the damper stay are arranged in a substantially straight line so that they are compactly housed, which allows a space at the rear of the vehicle body, for example, a loading space or unloading work. Restrictions on space, etc. are alleviated.

As a characteristic configuration of the invention of the present application, the configuration according to claim 1 eliminates an assembly error of each component of the back door opening / closing mechanism that performs the above operation, and particularly when each component is fully closed. This is a means to prevent variations in the state of being arranged along a substantially straight line.

That is, in a state in which the components of the opening / closing mechanism are connected to each other and assembled and supported by the bracket, first, the door-side link member is attached to the back door, and thereafter, the bracket is formed on the bracket. Insert a fastening member such as a bolt through the slotted hole, and temporarily secure the vehicle body so that the bracket can slide.

From this state, by fully closing the back door, the spacer attached to the vehicle body side link member comes into contact with the opening side edge of the vehicle body. Then, if there is an assembly error in the temporarily fixed state, the bracket slides in the direction along the side edge of the opening as the components cooperate with each other. As a result, the stopped position of the bracket is determined as the optimum position for bringing the components into a predetermined arrangement state along a straight line when the back door is fully closed. In addition, the vehicle-body-side link member is held at a fixed position by a spacer with respect to the side edge of the opening of the vehicle body with a predetermined gap therebetween, so that the other components are also fixed at a fixed position. Are arranged in.

After positioning the bracket in this manner, the back door is slightly opened within a range where the position is hardly displaced, and a tool such as a spanner is inserted through a gap generated by the back door. Fix the above bracket to the vehicle body by completely tightening the bolts. As a result, the form of the opening / closing mechanism does not become distorted when fully closed, and therefore the door side link member and the vehicle body side link member do not interfere with the back door and vehicle body, and scratches caused by the interference are added. Assembling work can be completed without any trouble and with a simple operation.

On the other hand, according to the second aspect of the present invention, when the back door is fully opened, there is no variation in the state in which the constituent elements are arranged along a substantially straight line. It is a means for ensuring an appropriate holding force.

That is, since the vehicle body side link member and the door side link member are arranged in a substantially straight line when fully opened, when the damper paste is at its maximum extension (when the damper paste is fully extended). Due to the inherent variation in the length of (1), both link members are excessively expanded around the connecting portion between them, or they are fully expanded in a state where they are not sufficiently expanded. As a result, problems such as difficulty in closing from the fully open position and the inability to secure an appropriate holding force at the fully open position will occur.

Therefore, by changing the connecting position of the damper stay with respect to the bracket supporting the lower ends of both the vehicle body side link member and the damper stay by the connecting position adjusting mechanism, the relative position between the vehicle body side link member and the damper stay is increased. The position changes, and the posture of the opening / closing mechanism in the fully open position is corrected. This posture can be corrected by changing the connecting position of the vehicle body side link member to the bracket by the connecting position adjusting mechanism, and the connecting position of both the vehicle body side link member and the damper stay to the bracket. Can be changed by each connecting position adjusting mechanism.

As a result, the holding force when the back door is fully opened can be kept constant and an appropriate value, and the change characteristic of the operating force during opening and closing can be made suitable. .

[0032]

[Explanation of Examples]

 Hereinafter, an embodiment of a back door opening / closing mechanism for an automobile according to the present invention will be specifically described with reference to the drawings.

First, the basic configuration of this embodiment will be described with reference to FIGS.

As shown in FIG. 1, the back door 1 has an upper end portion which is openably and closably attached via an opening / closing fulcrum 3 near an upper edge of an opening at the rear of the vehicle body 2, and an intermediate portion of the back door 1. It is connected to the vehicle body 2 via a door opening / closing mechanism 4.

The back door opening / closing mechanism 4 includes a door side link member 6 whose rear end is rotatably supported by a door side bracket B 1 attached to the back door 1, and a vehicle body whose lower end is attached to the vehicle body 2. The vehicle body side link member 8 is rotatably supported by the side bracket B2. Specifically, the door side bracket B1 is provided with a door side support shaft 5 to which a rear end of a door side link member 6 is connected, and the vehicle body side bracket B2 is connected to a lower end of a vehicle body side link member 8. A vehicle body side support shaft 7 is provided. Then, the front end of the door side link member 6 and the upper end of the vehicle body side link member 8 are rotatably connected via a support shaft 9.

An upper end of a damper stay 11 is rotatably connected to an intermediate portion in the longitudinal direction of the door side link member 6 via an intermediate support shaft 10, and a lower end of the damper stay 11 has the vehicle body side bracket. It is rotatably supported by B2. The lower end of the vehicle body side link member 8 is connected to the vehicle body side bracket B2, which will be described later, so as to be substantially coaxial with the vehicle body side support shaft 7 by way of an auxiliary support shaft 7a. It is rotatably supported. As described above, the damper stay 11 includes the cylinder 11a filled with gas and the piston rod 11b biased in the protruding direction by the gas pressure.

The dimensions of the link members 6 and 8 and the damper stay 11, the attachment positions of the door-side support shaft 5 and the vehicle-body-side support shaft 7 (and the auxiliary support shaft 7a), and the intermediate support shaft 10 of the door-side link member 6 The arrangement position of is set as follows.

That is, when the back door 1 shown in FIG. 2 is fully closed, the door-side link member 6 and the vehicle-body-side link member 8 are in a folded state, and both the link members 6 and 8 and the damper stay. 11 and 11 are arranged along substantially the same straight line. On the other hand, when the back door 1 shown in FIG. 3 is fully opened, the door-side link member 6 and the vehicle-body-side link member 8 are in an expanded state, and the both link members 6 and 8 and the damper stay 11 are substantially opened. It is set so that they are arranged along the same straight line.

Further, as shown in FIG. 1, the intermediate support shaft 10, which is a connecting portion of the damper stay 11 to the door-side link member 6, is provided with the door-side support shaft 5 and the vehicle-body-side support shaft at both ends of the door-side link member 6. It is arranged so as to deviate from the straight line L1 connecting the shaft 7 by a predetermined dimension a. More specifically, the intermediate support shaft 10 is deviated to the side opposite to the direction in which the door-side link member 6 rotates about the support shaft 9 when the back door 1 is opened.

According to such a basic configuration, when the back door shown in FIG. 2 is fully closed, the body side link member 8 and the damper stay 11 are arranged so as to overlap with each other, so that the gas pressure of the damper stay 11 causes The force in the extension direction is absorbed by the vehicle body side link member 8. This makes it possible to prevent a large force from acting on the back door 3 when fully closed.

On the other hand, when the back door shown in FIG. 3 is fully opened, the intermediate support shaft 10 of the door side link member 6 moves to the opposite side beyond the straight line L2 connecting the door support shaft 5 and the vehicle body support shaft 7. Become here.

In the back door opening / closing mechanism 4 that operates as described above, the operating force from the time of fully closing to the time of fully opening is represented by a characteristic curve as indicated by reference symbol Y in FIG. Compared with the conventional characteristic curve A, this characteristic curve Y does not show a peak at a position slightly before the fully opened position Y2, and is indicated by a symbol Y1 from the time when it reaches the vicinity of the fully opened position. The operating force suddenly increases and reaches the maximum at the fully open position Y2.

As a result, the back door 1 is supported with the maximum holding force at the fully open position, and the problem that the operation becomes heavy during the closing thereof is avoided.

Further, using the above characteristic curve Y, as shown in FIG. 5, the gas pressure of the damper paste 11 is adjusted so that the operating force becomes zero within a predetermined range Yx during the opening / closing operation of the back door 1. Even if set, a predetermined holding force of zero or more can be obtained at the fully open position Y2. As a result, for example, when a short child or the like operates the back door 1 to open and close, the back door 1 can be stopped and held at an arbitrary position in the middle of the opening operation, and it cannot be opened to the fully open position. Even if there is, it will be possible to smoothly load and unload luggage.

Next, the characteristic part of the present invention will be described. This characteristic part eliminates the assembly error of each component of the back door opening and closing mechanism that performs the above operation, corrects each component to a predetermined posture along a substantially straight line when fully closed and fully opened, and It is provided to prevent the above interference and to exhibit the above characteristics.

As shown in FIGS. 6 and 7, the vehicle body side bracket B2 is fixed to the vehicle body 2 using fastening members 12, 12 such as bolts. The bottom surface of the vehicle body side bracket B2 The portion is formed with elongated holes 13, 13 in a direction (xy direction) along the opening side edge 2a at the rear of the vehicle body.

Further, on the upper portion of the vehicle body side link member 8 (which may be an intermediate portion in the longitudinal direction), a spacer 14 made of a cushion member or the like that abuts against the opening side edge 2a at the rear of the vehicle body is attached. Has been.

It should be noted that the vehicle body side bracket B2 and the door side bracket B1 are in plan view as shown in FIGS. 8 and 9, respectively, so that the opening side edge 2a of the vehicle body 2 and the inner surface of the back door 1 are It is attached to 1a.

According to this structure, the assembled brackets are formed by connecting the constituent elements 6, 8 and 11 to each other, and are supported by the brackets B1 and B2. To the back door 1. Thereafter, the fastening member 12 such as a bolt is inserted into the elongated hole 13 formed in the vehicle body side bracket B2, and the bracket 2 is temporarily fixed to the opening side edge 2a of the vehicle body 2 so that the bracket B2 can be slid. I'll do it.

From this state, if the back door 1 is moved to the fully closed position, the variation in the distance between the two brackets B1 and B2 or the distance between the two support shafts 5 and 7 during folding can be achieved. Due to the variation, as shown in FIG. 10, the door side link member 6 or the vehicle body side link member 8 interferes with the opening side edge 2a of the vehicle body 2 at a portion indicated by the symbol F, or as shown in FIG. As shown, the members 6 and 8 interfere with the back door 1 at the location indicated by the symbol G, which causes a problem.

However, in the present invention, the spacer 14 attached to the vehicle body side link member 8 is brought into contact with the opening side edge 2a, and the vehicle body side bracket B2 in the temporarily fixed state is provided as a component. The vehicle body side bracket B2 is stopped at the optimum position when the back door 1 is closed to the fully closed position by being slid along with the interlocking movement.

After that, the back door 1 is slightly opened within a range (about 10 mm) in which the vehicle body side bracket B2 is hardly displaced from the stop position, and the gap between the back door 1 and the vehicle body 2 at this time is opened. By inserting a tool such as a spanner and completely tightening the fastening member 12, the vehicle body side bracket B2 is fixed to the vehicle body 2.

At this point, the vehicle body side link member 8 is held at a fixed position with respect to the opening side edge 2 a with a predetermined gap provided by the spacer 14, and accordingly, the door side The link member 6 and the damper stay 11 are also held at a fixed position. As a result, as shown in FIGS. 1 and 6, the constituent elements 6, 8 and 10 are arranged in a predetermined arrangement along a substantially straight line which is the initial setting state when fully closed, and moreover, it is accurate. I will take a posture.

On the other hand, due to an error in assembly, even when the back door 1 is fully opened, variations occur in the state in which the above-mentioned constituent elements 6, 8 and 11 are arranged along a substantially straight line. The main reason for this is that when the piston rod 11b of the damper stay 11 extends to the projecting end, there is a variation of about ± 3 mm due to each damper stay.

Therefore, in the present invention, the connecting position adjusting mechanism 15 as shown in FIG. 7 is provided. The connecting position adjusting mechanism 15 has a spherical bearing 16 including a ball stud 16a fixed to the vehicle body side bracket B2 and a socket 16b engaged and held by the ball stud 16a, and a female screw formed on the socket 16b. The male screw portion 11c formed at the tip of the piston rod 11b of the damper stay 11 is screwed to the portion 16c. The ball stud 16a of the spherical bearing 16 corresponds to the vehicle body side support shaft 7 described above.

The lower end of the vehicle body side link member 8 is rotatably connected to an auxiliary bracket B3 via an auxiliary support shaft 7a. The auxiliary bracket B3 is provided with a lock nut at one end of the socket 16b. It is fixed using 17. A shim is provided between the one end of the socket 16b and the auxiliary bracket B3, H, if necessary. In this case, the male screw portion 11c of the piston rod 11b penetrates an insertion hole formed in the auxiliary bracket B3.

According to this structure, the connecting position of the damper stay 11 with respect to the vehicle body side bracket B 2 can be changed by rotating the piston rod 11b relative to the socket 16b. Further, if necessary, a shim is provided between the socket 16b and the auxiliary bracket B3, or the thickness of the shim is changed to connect the vehicle body side link member 8 to the vehicle body side bracket B2. The position can be changed.

The adjustment of the connecting position is performed by adjusting the installation position of the door-side support shaft 5 so that the dimension indicated by reference character K in the figure is within the limited dimension in the fully opened state shown in FIG. This is done by changing it. With such a change in the connecting position, the link members 6 and 8 and the damper stay 11 work together to correct the posture of the link mechanism formed by each component, and the shape of the link mechanism at the time of full opening varies. Disappear. As a result, the holding force when the back door 1 is fully opened is always constant and appropriate, and the change characteristic of the operating force during opening and closing is also suitable.

The connecting position adjusting mechanism 15 employs a means for screwing the socket 16b and the piston rod 11b together, and a means for providing a shim between the socket 16b and the auxiliary bracket B3. In addition to this, for example, a plurality of engaging claws are linearly arranged on either one of the socket 16b or the piston rod 11b, and a locking claw that meshes with the engaging claws is formed on the other side. A means for changing the meshing position, a means for screwing the socket 16b and the vehicle body side link member 8 with a screw, or the like may be adopted.

Further, in the above embodiment, the intermediate support shaft 10 of the door side link member 6 is displaced in a specific direction with respect to the straight line connecting the support shafts 5 and 9 at both ends thereof. If they are not displaced or arranged in the vicinity of the same straight line, the holding force will be maximized at the fully open position Y2, even if there is no sudden increase in position as shown by symbol Y1 in FIG. It becomes large, and it can be avoided that the operation force becomes maximum in the middle A1 of the opening / closing path as in the conventional case.

More specifically, regardless of the eccentric state of the intermediate support shaft 10, both link members 6 and 8 are arranged on substantially the same straight line at the fully opened position of the back door 1, so that both link members are laid. Since 6 and 8 are in a state in which they are difficult to rotate, and this state in which they are difficult to rotate is maintained by the gas pressure of the dump paste 11, the holding force for holding the back door 1 is maximum at the fully open position. is there.

In addition, regardless of the eccentric state of the intermediate support shaft 10, when the back door 1 is fully closed, the respective constituent elements are arranged along substantially the same straight line as shown in FIG. Therefore, the space behind the vehicle body is not restricted. Further, even when the back door 1 is fully opened, the respective constituent elements are arranged along substantially the same straight line as shown in FIG. 3, so that these constituent elements interfere when loading and unloading luggage. It is possible to minimize the situation that

[Brief description of drawings]

FIG. 1 is a schematic side view of essential parts showing an embodiment of a back door opening / closing mechanism according to the present invention, showing a state in which the back door is being opened / closed.

FIG. 2 is a schematic side view of essential parts showing a state when the back door is fully closed in the embodiment.

FIG. 3 is a schematic side view of essential parts showing a state in which the back door is fully opened in the above embodiment.

FIG. 4 is a graph showing an example of change characteristics of the operating force according to the above embodiment.

FIG. 5 is a graph showing another example of change characteristics of the operating force according to the above-mentioned embodiment.

FIG. 6 is an enlarged side view of essential parts showing in detail a fully closed state of the back door in the embodiment.

FIG. 7 is an enlarged vertical sectional front view of a main part showing a connection position adjusting mechanism which is a component of the back door opening / closing mechanism in the above-described embodiment.

FIG. 8 is a cross-sectional plan view of essential parts showing a mounted state of a bracket which is a component of the back door opening / closing mechanism in the above-described embodiment.

FIG. 9 is a cross-sectional plan view of essential parts showing a contact state of spacers, which are components of the back door opening / closing mechanism in the above-described embodiment.

FIG. 10 is a schematic side view of an essential part showing a problem when the back door opening / closing mechanism in the above embodiment is not provided with the characteristic part of the present application.

FIG. 11 is a schematic side view of an essential part showing a problem when the back door opening / closing mechanism in the above embodiment is not provided with the characteristic part of the present application.

FIG. 12 is a schematic perspective view showing a conventional example.

FIG. 13 is a graph showing a change characteristic of operating force according to a conventional example.

FIG. 14 is a schematic side view showing the operation of the conventional example.

FIG. 15 is a schematic side view showing the operation of the conventional example.

[Explanation of symbols]

 1 Back Door 2 Car Body 3 Opening / Closing Support Point 4 Back Door Opening / Closing Mechanism 5 Door Side Support Shaft 6 Door Side Link Member 7 Body Side Support Shaft 8 Body Side Link Member 9 Mutual Support Shaft 10 Intermediate Support Shaft 11 Dampa Stay 13 Oblong Hole 14 Spacer 15 Connection position adjustment mechanism B2 bracket (body side bracket)

Claims (2)

[Scope of utility model registration request] 1. A back door opening / closing mechanism for an automobile, wherein a damper stay expands / contracts in accordance with opening / closing movement of a back door having an opening / closing fulcrum near an upper edge of an opening at the rear of a vehicle body. A door-side link member that is freely connected, a lower end that is rotatably connected to the vehicle body, and an upper end that is rotatably connected to the other end of the door-side link member, and a lower end that is the vehicle body. A rear link member which is rotatably connected substantially coaxially with a lower end connecting portion of the side link member and has an upper end rotatably connected to a longitudinal middle portion of the door side link member, and the back door is fully closed. The door-side link member, the vehicle-body-side link member, and the damper stay are arranged so as to be arranged substantially on the same straight line at the time of fully opening. Is rotatably supported by a bracket attached to the vehicle body, a long hole for adjusting the bracket attachment position is formed in the bracket along the side edge of the opening, and the length of the vehicle body side link member is long. A back door opening / closing mechanism for an automobile, characterized in that a spacer that can come into contact with a side edge of the opening is attached to an intermediate portion or an upper portion of the direction. 2. A back door opening / closing mechanism for an automobile, wherein a damper stay expands / contracts in accordance with opening / closing movement of a back door having an opening / closing fulcrum near an upper edge of an opening at the rear of a vehicle body. A door-side link member that is freely connected, a lower end that is rotatably connected to the vehicle body, and an upper end that is rotatably connected to the other end of the door-side link member, and a lower end that is the vehicle body. A rear link member which is rotatably connected substantially coaxially with a lower end connecting portion of the side link member and has an upper end rotatably connected to a longitudinal middle portion of the door side link member, and the back door is fully closed. The door-side link member, the vehicle-body-side link member, and the damper stay are arranged so as to be arranged substantially on the same straight line at the time of fully opening. Is rotatably supported by a bracket attached to the vehicle body, and a connecting position adjusting mechanism for adjusting the connecting position of the vehicle body side link member and / or the damper stay to the bracket is provided. Back door opening and closing mechanism.