JPH10299818A - Stay damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stay damper which allows the piston rod or cylinder tube of a stay damper to be mounted to/demounted from a bracket, allows the combination of a piston rod or a cylinder tube with the bracket to be easily affirmed, also enables parts to be replaced every part at the time of part replacement, prevents the occurrence of corrosion, and is excellent in processability, assemblage and economy. SOLUTION: A bracket is composed of a ball joint 4 or an L-shaped bracket, and the ball joint or the L-shaped bracket is provided with a main body 6, a cylindrical part 7 provided for the end of the main body 6, and with paired cut-out holes formed in the outer circumferential side part of the cylindrical part 7, a tongue and groove part 3a is formed in one of the outer ends of a piston rod and a cylinder tube, or both of them, an annular groove 36 is formed in the outer circumference of the tongue and groove part 3a, the aforesaid tongue and groove part 3a is fitted into the inside of the cylindrical part 7, and concurrently, a disc spring type faster 10 in a fork shape is inserted into the inside of the aforesaid annular groove from the aforesaid cut-out hole in such a way as to be freely mounted/demounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle, such as an automobile, which is interposed between a vehicle body and a back door to open and close a bag door, or interposed between a window frame of a building and a window. The present invention relates to a stay damper suitable for use such as opening and closing a window.

[0002]

2. Description of the Related Art Generally, in vehicles such as automobiles and industrial transport vehicles, a trunk is provided at a rear portion of a vehicle body, and the trunk is opened and closed by a back door provided in the vehicle body.
Moreover, a stay damper, which is a gas spring constantly biased in the direction of extension by gas pressure, is interposed between the back door and the vehicle body, and when the lock is released, the back door automatically opens with this stay damper. It is common to have.

The stay damper includes a damper cylinder as a cylinder tube, a piston rod movably inserted into the damper cylinder via a piston, and constantly urged in the direction of extension by the gas pressure in the damper cylinder; It consists of a rod and a bracket integrally provided at the outer end of the damper cylinder, and the stay damper itself is connected to the vehicle body and the back door via the bracket.

The above-mentioned brackets are, for example, ball joints or L-shaped brackets, and these brackets are detachably connected to mounting portions provided on the vehicle body and on the back door.

[0005] For example, when the bracket is a ball joint, a mounting portion composed of a spherical bolt is mounted on the vehicle body side and the back door side, and the spherical body of the spherical bolt is fitted into the spherical receiving portion of the ball joint and a snap ring or the like is used. I'm trying to keep it.

As described above, for example, when a spherical bolt is fitted to a ball joint, the spherical bolt cannot be pulled out by the snap ring in the spherical receiving portion, and it becomes difficult to remove the stay damper itself.

However, when loading luggage in the trunk or taking out luggage in the trunk, the stay damper is an obstacle. There is a request to do.

Therefore, for example, German Patent No. 65960
A detachable ball joint and a spherical bolt have been developed as disclosed in Japanese Patent Application Publication No. 0-205.

The ball joint and the spherical bolt have a stopper structure shown in FIG. That is, for example, the ball joint 31 is integrally connected to the outer end of the piston rod 30, the spherical bolt 32 is attached to the vehicle body side, and the tip sphere 34 of the spherical bolt 32 is freely movable in the spherical receiving portion 33 of the ball joint 31. Then, a lock wire composed of a snap ring-shaped C-shaped ring 35 is inserted into the spherical receiving portion 31 from the outside to prevent the spherical body 34 from coming off, and a wire-shaped spring portion 36 connected to the ring 35 is inserted. Is engaged with the base end side of the ball joint 31.

[0010]

When the ball joint 31 having the above-mentioned ring 25 is used, the ring 35 can prevent the spherical bolt 32 from coming off in the same manner as a normal snap ring, and the spring portion 36 can be moved by a finger. If the ball 35 is pulled out while being operated to release the engagement, the ring 35 is pulled out, whereby the connection of the ball joint 31 to the spherical bolt 32 is released, so that the stay damper is disengaged from the back door and interferes with this stay damper. It is possible to get luggage in and out without having to.

However, the stay damper has the following disadvantages.

In order to remove the stay damper, the operation of releasing the spring force of the spring portion 36 and the operation of pulling out the ring 35 must be performed with fingers, which is troublesome and difficult. Other tools may be required for the release operation. Further, when the ball joint 31 and the spherical bolt 32 are to be joined again after being removed once, it is necessary to first insert the spherical bolt 32 into the ball joint 31 and then insert the ring 36, so that the joint cannot be made with one touch. Therefore, the joining operation is very troublesome.

When attaching the stay damper to the back door or the like, it is difficult to confirm whether the ring 35 is securely inserted into the ball joint 31.
And the spherical bolt 32 lacks reliability.

When replacing the stay damper, not only the stay damper itself but also the ball joint 31 and the ring 35
It is necessary to replace the entire unit including the parts, etc., so that replacement parts are expensive.

The stay damper may be connected to the vehicle body and the back door by using, for example, an L-shaped bracket or another bracket. However, as described above, in the type in which the ball joint 31 is integrally connected to the stay damper. There is no compatibility, and it is necessary to form a bracket in accordance with the structure and shape of the mounting portion on the back door side or the vehicle body side each time. In this case, it is necessary to connect a different bracket to the piston rod or the damper cylinder of the stay damper by welding, caulking, or the like, which is inferior in workability and assemblability, and causes an increase in cost. In addition, when other brackets are joined by welding or caulking, surface treatment and painting treatment of the joints are required. For example, if the paint is peeled off, it causes rust and the rust prevention effect is weak.

Accordingly, an object of the present invention is to easily and quickly attach and detach the piston rod or the cylinder tube of the stay damper to and from the bracket, to reliably check the connection state of the piston rod or the cylinder tube to the bracket, An object of the present invention is to provide a stay damper that can be replaced for each part and that prevents rusting and is excellent in workability, assemblability, and economy.

[0017]

In order to achieve the above-mentioned object, the present invention provides a cylinder tube and a cylinder tube which is movably inserted through a piston into the cylinder tube and is constantly extended by the gas pressure in the cylinder tube. In a stay damper comprising a piston rod urged in the direction and brackets provided at each end of the piston rod and the cylinder tube, the bracket comprises a ball joint or an L-shaped bracket, and the ball joint or the L-shaped bracket is used. The bracket includes a main body, a cylindrical body provided at an end of the main body, and a pair of cutout holes formed on an outer peripheral side of the cylindrical body, and one of an outer end of the piston rod and an outer end of the cylinder tube. Or, a spigot portion is formed on both sides, an annular groove is formed on the outer periphery of the spigot portion, the spigot portion is fitted into the cylindrical body portion, and the notch Al, is characterized in that the inserted detachably the bifurcated disk spring-type fastener in the annular groove.

In this case, the stopper comprises a plate-shaped handle portion, two corrugated legs suspended from both sides of the handle portion, and a locking projection projecting inward below each leg portion. Preferably.

Further, the two corrugated legs are formed by bending the plate into a wave shape, and the front and back surfaces of the plate are alternately brought into contact with the end surfaces of the cutout holes and the end surfaces of the annular grooves, and are further locked. It is preferable that the projection be in contact with the lower part of the spigot part where the annular groove is formed.

Furthermore, it is preferable that the end face of the piston rod and the end face of the cylindrical portion are brought into direct contact with each other to receive a load in the axial direction on the both end faces. Alternatively, the outer end surface of the spigot portion may be brought into direct contact with the inner peripheral end surface of the tubular body portion to receive the axial load on the both end surfaces.

[0021]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given based on FIGS.

The stay damper according to the present invention comprises a cylinder tube 1 and a piston rod movably inserted into the cylinder tube 1 via a piston 2 and constantly urged in the extending direction by the gas pressure in the cylinder tube 1. 3
And ball joints 4 provided at each end of the piston rod 3 and the cylinder tube 1.

Each of the ball joints 4 includes a main body 6, a cylindrical body 7 provided at an end of the main body 6, and a pair of cutout holes 9, 9 formed on the outer peripheral side of the cylindrical body 7. I have. A spigot portion 3a is formed at an outer end of the piston rod 3 and an outer end of the cylinder tube 1, and each spigot portion 3a, 3a
Annular grooves 3b are formed on the outer periphery of. Each of the spigot portions 3a, 3a is fitted into the hollow portion 8 of the cylindrical body portion 7 of each ball joint 4, and a bifurcated shape is formed from the notch hole 9, 9 into the annular groove 3b of the spigot portion 3a. The disc spring-type stopper 10 is detachably inserted.

The stay damper body A composed of the cylinder tube 1, the piston 2 and the piston rod 3 may be connected to each of the ball joints 4 and 4 via the piston rod 3 and the cylinder tube 1, or One may be detachably connected.

The stopper 10 has a plate-shaped handle portion 11 and two corrugated legs 12, 12, which are suspended from both sides of the handle portion 11.
And locking projections 13, 13 protruding inward below the legs 12, 12.

In this case, the two corrugated legs 12, 12
As shown in FIG. 2, the plate body is formed by bending into a waveform,
The front surface and the back surface of the plate body are notched with the end surface of the notch hole 9 and the annular groove 3b.
Alternately abut against the end face. Further, the locking projections 13, 13 are brought into contact below the small diameter portion 30 of the spigot portion 3a in which the annular groove 3b is formed.

When the spigot part 3a is fitted into the hollow part 8 of the cylinder part 7, the end face a of the piston rod 3 and the end face b of the cylinder part 7 come into direct contact as shown in FIGS. Thus, the load F from the axial direction is received by the both end surfaces a and b.

In this case, the outer end surface of the spigot portion 3a may be brought into direct contact with the inner peripheral end surface of the cylindrical body portion 7 to receive the axial load F on these two end surfaces. In these cases, a large load does not act on the stopper 10, preventing its damage and facilitating the attachment / detachment work. Next, the operation will be described.

For example, the spigot portion 3 of the piston rod 3
a is inserted into the cylindrical portion 7 of the ball joint 4, and then a stopper 10 is attached through the notch holes 9, 9, and when the legs 12, 12 are fitted into the annular groove 3 b, the ball joint 4 is inserted. On the other hand, the piston rod 3 is connected. Conversely, when the stopper 10 is removed, the piston rod 3 can be extracted from the ball joint 4. Leg 12 of stop 10,
Reference numeral 12 denotes a spherical bolt 5 in which the ball joint 4 is previously mounted on the vehicle body side and the back door side in use.
After that, the stay damper body A may be connected to the ball joint 4. However, generally, the piston rod 3 and the cylinder tube 1 are connected to the ball joint 4 in advance in a production line. Assemble with In this state, in order to interpose the stay damper main body A between the vehicle body and the back door, the main body 6 of the ball joint 4 is pushed into the spherical body 5a of the spherical bolt 5 attached to the vehicle body and the back door in advance, and The sphere 5a may be fitted into the 4a with one touch.
As a result, after the stay damper body A is attached, the back door is automatically opened by the stay damper body A, and the opened state is maintained.

On the other hand, when the stay damper body A is in the way when the luggage in the trunk is put in and out, for example,
When the stopper 10 holding the piston rod 3 side is pulled out from the notch hole 9 manually or with a tool, the cylindrical body 7 is attached to the spigot portion 3.
The piston rod 3 is removed from the ball joint 4 by removing the spigot portion 3a from the hollow portion 8 and the stay damper body A is tilted at an angle that does not interfere with the load. In this state, the luggage can be freely inserted and removed without interfering with the stay damper. After the luggage is completely inserted and removed, the spigot portion 3a is inserted into the cylindrical portion 7 again and the both are connected by the stopper 10. It is possible to do.

FIG. 6 relates to another embodiment of the present invention.
This uses an L-shaped bracket 21 instead of the ball joint 4 described above.

The L-shaped bracket 21 has an L-shaped main body 21.
a, a mounting hole 22a formed in the main body 21a,
a of the cylindrical body 7 provided at an end of the cylindrical body 7.
The spigot part 3a of the piston rod 3 or the spigot part 3a of the cylinder tube 1 on the side of the stay damper main body A is inserted into the stay damper body A and connected with the stopper 10 shown in FIGS.

The L-shaped bracket 21 is fixed by inserting a mounting portion provided on the vehicle body side or the back door side into the mounting hole 22a. Other configurations, operations, and effects are the same as those in the embodiments shown in FIGS.

[0034]

According to the present invention, the following effects can be obtained.

Since the bracket is provided on one or both of the piston rod and the cylinder tube, the stay damper itself can be connected between the vehicle body and the back door via the bracket. On the other hand, when it is desired to remove the stay damper to a position where it does not interfere with the luggage when the luggage is loaded or unloaded, the piston rod or the cylinder tube may be removed from the bracket, and the detachment / removal of the stay damper body is easy.

Similarly, even if there are various types of brackets, such as a ball joint and an L-shaped bracket, it is sufficient that a bracket according to the specification is detachably connected to the piston rod or the cylinder tube, and the stay damper itself is a general one. Since a structure can be used, it is necessary to produce the entire stay damper for each bracket according to the specifications, so that it is rich in compatibility, excellent in workability, assemblability, and economy.

Similarly, since the bracket and the piston rod or the cylinder tube are detachably connected to each other with a stopper having a high spring property, the operation of attaching and detaching the two can be performed easily, and the operability can be improved. In addition, since the bracket can be connected irrespective of the coupling structure to the vehicle body side or the back door, the stopper and its mounting structure can be simplified, and the workability, assemblability, and economy are excellent.

According to the second and third aspects of the present invention, the stopper has a corrugated leg and a projection below the leg.
When the stopper is mounted, play between the piston rod and the bracket is prevented, and the stopper itself is prevented from coming off.

According to the fourth or fifth aspect of the present invention, the axial load is carried by the end surface of the piston rod and the end surface of the cylindrical portion or the end surface of the hollow portion of the cylindrical portion and the end surface of the spigot portion. Does not require a large burden, and therefore, can be simplified in structure, and is excellent in workability, assemblability, and economy.

[Brief description of the drawings]

FIG. 1 is an overall exploded front view of a stay damper according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a bracket, a piston rod, and a stopper.

FIG. 3 is a partially enlarged front view showing a connected state of a bracket and a piston rod of FIG. 1;

FIG. 4 is a vertical sectional bottom view of FIG. 2;

FIG. 5 is a vertical sectional side view taken along line VV of FIG. 3;

FIG. 6 is an enlarged sectional view of an L-shaped bracket.

FIG. 7 is a partially cutaway sectional view of a conventional bracket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder tube 2 Piston 3 Piston rod 3a Inlay part 3b Annular groove 3c Small diameter part 4 Ball joint 6,21 Main body 7 Cylindrical part 9 Notch hole 10 Stopper 11 Handle part 12 Corrugated leg part 13 Projection 21 L-shaped bracket

Claims (5)

[Claims] 1. A cylinder tube, a piston rod movably inserted into the cylinder tube via a piston, and constantly urged in an extending direction by gas pressure in the cylinder tube; In a stay damper comprising a bracket provided at each end, the bracket comprises a ball joint or an L-shaped bracket, and the ball joint or the L-shaped bracket comprises a main body, a cylindrical body provided at an end of the main body, and a cylinder. A pair of notch holes formed on the outer peripheral side of the body portion, a spigot portion is formed at one or both of the outer end of the piston rod and the outer end of the cylinder tube, and an annular groove is formed on the outer periphery of the spigot portion. The spigot-shaped disc spring-type stopper is detachably inserted into the annular groove from the cutout hole by fitting the spigot part into the cylindrical body part. A stay damper. 2. A stopper comprising a plate-like handle, two corrugated legs vertically extending from both sides of the handle, and a locking projection projecting inward below each leg. Item 1. Stay damper. 3. The two corrugated legs are formed by bending a plate into a corrugated shape, and the front and back surfaces of the plate are alternately brought into contact with the end face of the notch hole and the end face of the annular groove, and are further locked. 3. The stay damper according to claim 2, wherein the projection is in contact with a lower portion of the small diameter portion of the spigot portion where the annular groove is formed. 4. The stay damper according to claim 1, wherein the end face of the piston rod and the end face of the cylindrical portion are brought into direct contact with each other to receive an axial load on the both end faces. 5. The stay damper according to claim 1, wherein the outer end surface of the spigot portion is brought into direct contact with the inner peripheral end surface of the cylindrical body portion to receive the axial load on the both end surfaces.