DE102005038765A1 - Tension spring arrangement for motor vehicle, has movable piston arranged in cylinder space for separating space into piston rod distant working chamber and rod near working chamber, where valve device is arranged in near working chamber - Google Patents

Abstract

The arrangement has a tension spring (1) with an end coupled to a body of a vehicle, and including another end coupled to a coupling point of a flap, where the spring has a cylinder (2). A movable piston (8) arranged in a space of the cylinder separates the space into a piston rod distant working chamber (12) and a piston rod near working chamber (13). A piston rod (4) has an end fastened to the piston, where the end of the rod forms the former end of the spring and a closed end of the cylinder forms the latter end of the spring. A valve device (18) is arranged in the chamber (13).

Description

The The invention relates to a tension spring arrangement for a order a pivot axis of a hinge or multi-joint hinge between a closed position and an open position hinged flap on a motor vehicle, with a tension spring, with a spring end on the bodywork of the motor vehicle and hinged to the other end of the spring at a pivot point of the flap is, wherein the tension spring has a cylinder closed on one side, the cylinder chamber arranged by a displaceable in the cylinder chamber Pistons sealed to each other in a first piston rod remote working chamber and a second piston rod near working chamber is separated with a with its one end attached to the piston piston rod, which is guided out of the second working chamber sealed to the outside, being the outside projecting end of the piston rod the one end of the spring and the closed End of the cylinder forms the other end of the spring.

at Such a tension spring arrangement, it is known as a tension spring a Use a coil tension spring. Such Schraubenzugfedern need one huge Installation space, are susceptible to corrosion and generate during the driving operation of the motor vehicle disturbing rattling noises.

Furthermore, from the DE 44 20 474 C2 a Gaszugfeder known which comprises a cylinder tube open on both sides, which is closed on one side by a bottom piece with threaded connection for a joint eye and on the opposite side with a guide and sealing package. A piston is connected to a sealed outwardly guided piston rod and separates the cylinder interior in two working chambers. In the piston rod guide, a filling valve is arranged to fill one of the working chambers with a gas.

A Such gas spring is in its strength after filling with Gas can no longer be influenced by the end user, i. the after a while Maybe use occurring gas losses and the associated loss of traction can no longer be compensated by the end user and that Device must be replaced with a new one.

task The invention is therefore a tension spring arrangement of the aforementioned To create a kind of simple and minimal installation space requiring Structure has, in the disturbing rattling noises be avoided and the tensile force of the tension spring assembly by the End user himself can be adjusted.

These Task is inventively characterized solved, that in the second piston rod near working chamber, a valve device is arranged in the cylinder.

By This training is a compact design of the spring possible, at by the exact guidance avoid the components of the tension spring disturbing rattling noises be and the tensile force of Zugfederanordnung by the end user can be adjusted yourself.

In Advantageous embodiment, the valve device comprises a valve for motor vehicle or bicycle tires, which in a simple way the pressure in one of the working chambers elevated can be.

For this the valve device can be screwed into the cylinder or to the Be welded cylinder.

In order to the valve device and / or the piston of the tension spring are not damaged, the valve device is in a region of the second working chamber arranged between a management and seal package and a stop for the piston, which is the Stroke of the piston / piston rod assembly in the extension direction from the Cylinder limited.

A prevents the filter device arranged on the valve device the ingress of dirt particles or moisture, causing the Increased service life of the tension spring becomes.

The the piston rod-distant first working chamber is via an opening with the outside air connected, whereby in the first chamber always atmospheric pressure prevails.

at an embodiment of the invention the cylinder has an opening on, extending in the radial direction through the wall of the cylinder extends.

at an alternative embodiment the cylinder has an opening on, extending coaxially through the closed end of the cylinder and by the arranged at the closed end of the cylinder connection element extends.

A at the opening arranged filter device prevents the penetration of dirt particles or moisture, whereby the life of the tension spring is increased.

In Advantageous embodiment, the cylinder is made of plastic. This means a weight reduction compared to steel and reduces costs for the Mainspring.

at a further embodiment is the piston rod near second working chamber via a pressure relief valve with the outside air connectable, whereby the excessive filling of the first working chamber is prevented.

The pressure relief valve connects the piston rod near the second working chamber at a pressure of 4 to 10 bar with the outside air. As advantageous has a setting of the pressure at 5 to 7 bar and particularly advantageous at about 6 bar exposed.

A good damping the opening movement combined with a power assistance when opening the Flap is achieved in that a tension spring parallel acting motion damping element with one end to the body and the other end is hinged to a pivot point of the flap.

there can the motion damping element be an oil damper.

One embodiment The invention is illustrated in the drawing and will be described below described in more detail. Show it

1 a schematic representation of a tension spring in a flap assembly with the flap closed

2 a schematic representation of a tension spring in a flap assembly with the flap open

3 a first embodiment of a tension spring according to the invention in longitudinal section.

4 a second embodiment of a tension spring according to the invention in longitudinal section.

1 shows a flap assembly with a tension spring 1 on one side with one at the closed end of the cylinder 2 arranged first connection element 3 , which is hinged to a part of a vehicle body, and on the other side with a on a piston rod 4 arranged second connection element 5 , which on a part of a vehicle flap 6 is articulated. The flap 6 is about a pivot axis 7 pivotable and is in its closed position, with the piston rod 4 the tension spring 1 out of the cylinder 2 is extended.

2 shows the flap assembly after 1 , but in the open position of the flap 6 , taking the flap 6 located in its closed position and the piston rod 4 the tension spring 1 in the cylinder 2 retracted.

The tension spring 1 includes, as described below with reference to 3 described a cylinder closed at one end 2 in which a piston 8th is arranged axially displaceable. The piston 8th has on its radially circumferential lateral surface an annular groove 9 into which a sealing ring 10 is inserted, with its radially encircling outer surface close to the inner wall 11 of the cylinder 2 in plant and the cylinder chamber in a first piston rod remote working chamber 12 and a second piston rod near working chamber 13 divided.

On the piston 8th is with its one end a piston rod 4 attached by the second working chamber 13 and a second working chamber 13 Outwardly closing guide and seal package 14 out of the cylinder 2 led out.

The outer end of the piston rod, not shown 4 is at a pivot point also not shown on the flap 6 articulated a motor vehicle.

The closed end of the cylinder 2 is with a connection element 3 hinged to a pivot point, not shown, on the body of the motor vehicle.

The extension movement of the piston rod 4 , which corresponds to the closing movement of the flap is limited by a stop, by a radially encircling, radially inwardly into the second working chamber 13 protruding bead 15 is formed.

The retraction movement of the piston rod 4 that the opening movement of the flap 6 is limited by a second stop, in turn, by a radially encircling, radially inwardly into the first working chamber 12 protruding bead 16 is formed.

In the closed end of the cylinder 2 near end of the cylinder 2 is in the wall of an opening 17 formed the first working chamber 12 connects with the outside air.

The second working chamber 13 is filled with pressurized fluid via a valve device 18 is filled, wherein the fluid preferably comprises a gas or gas-air mixture or ambient air.

Preference is given to the use of a valve device, which is the filling of the second Ar Chamber of Labor 13 with the help of commercial pumps, such as foot or bicycle pumps or similar pumps, as they are also found at gas stations, allows.

Another embodiment is shown in FIG 4 shown, which, in contrast to the embodiment described above, coaxially through the closed end of the cylinder 2 and by the arranged at the closed end of the cylinder connection element 3 ' extending opening 17 ' having. This will bring in the 3 shown bead 15 avoided, whereby the length of the tension spring can be reduced or the stroke can be increased. Furthermore, on a lateral arrangement of in 3 shown opening 17 can be omitted, whereby the penetration of dirt particles can be reduced in the cylinder interior.

In order to prevent penetration of dirt particles or moisture completely, it is conceivable to have a corresponding filter device at the opening 17 or 17 ' to arrange.

In the closed position of the flap 6 ( 1 ) is in the second working chamber 13 , unlike the first working chamber 12 with near atmospheric pressure, an increased pressure caused by filling the second working chamber 13 over the valve device 18 can be adjusted. This on the piston 8th acting pressure in the second working chamber 13 generates a force when opening the flap 6 the piston rod 4 with the piston 8th in the in 2 shown retracted position of the tension spring moves. The air mass in the first working space 12 is doing over the opening 17 respectively. 17 ' from the first working chamber 12 pushed into the atmosphere. This will open the flap 6 supported. Depending on the filling of the second working chamber 13 and the then prevailing pressure, the tension spring 1 the flap 6 completely open alone or one at the flap 6 support applied hand force only.

When closing the flap 6 that will be on the piston 8th acting pressure by compressing the fluid in the second working chamber 13 increased to reopen the flap 6 again provide a power assistance.

1

mainspring

2

cylinder

3

first connecting element

4

piston rod

5

second connecting element

6

flap

7

swivel axis

8th

piston

9

ring groove

10

seal

11

inner wall

12

first working chamber

13

second working chamber

14

managerial and sealing package

15

Beading

16

Beading

17

opening

18

valve means

Claims (16)

Tension spring arrangement for a pivotable about a pivot axis of a hinge or multi-joint hinge between a closed position and an open position flap on a motor vehicle, with a tension spring which is articulated with a spring end to the body of the motor vehicle and the other end of the spring at a pivot point of the flap, said Tension spring has a cylinder closed on one side, the cylinder space of a displaceably arranged in the cylinder chamber piston sealed to each other in a first piston rod remote working chamber and a second piston rod near working chamber is separated, with its one end attached to the piston piston rod, which seals from the second working chamber is guided to the outside, wherein the outwardly projecting end of the piston rod forms the one spring end and the closed end of the cylinder the other spring end, characterized in that in the second piston rod near working chamber ( 13 ) a valve device ( 18 ) in the cylinder ( 2 ) is arranged. Tension spring arrangement according to claim 1, characterized in that the valve device ( 18 ) comprises a valve for motor vehicle tires. Tension spring arrangement according to claim 1, characterized in that the valve device ( 18 ) comprises a valve for bicycle tires. Tension spring arrangement according to one of the preceding claims, characterized in that the valve device ( 18 ) in the cylinder ( 2 ) is screwed. Tension spring arrangement according to one of the preceding claims, characterized in that the valve device ( 18 ) to the cylinder ( 2 ) is welded. Tension spring arrangement according to one of the preceding claims, characterized in that the valve device ( 18 ) in an area of the second working chamber ( 13 ) is arranged between a guide and seal package ( 14 ) and a stop ( 16 ) for the piston ( 8th ) lies. Tension spring arrangement according to one of the preceding claims, characterized in that on the valve device ( 18 ) A filter device is arranged. Tension spring arrangement according to one of the preceding claims, characterized in that the piston rod remote first working chamber ( 12 ) via an opening ( 17 . 17 ' ) is connected to the outside air. Tension spring arrangement according to claim 8, characterized in that the cylinder ( 2 ) an opening ( 17 ), which extends in the radial direction through the wall of the cylinder ( 2 ). Tension spring arrangement according to claim 8, characterized in that the cylinder ( 2 ) an opening ( 17 ' ) coaxially through the closed end of the cylinder ( 2 ) and by the arranged at the closed end of the cylinder connection element ( 3 ' ). Tension spring arrangement according to one of claims 8 to 10, characterized in that at the opening ( 17 . 17 ' ) A filter device is arranged. Tension spring arrangement according to one of the preceding claims, characterized in that the cylinder ( 2 ) Plastic. Tension spring arrangement according to one of the preceding claims, characterized in that the piston rod near the second working chamber ( 13 ) via a pressure relief valve ( 19 ) is connectable to the outside air. Tension spring arrangement according to one of the preceding claims, characterized in that the pressure relief valve ( 19 ) the piston rod near the second working chamber ( 13 ) connects at a pressure of 4 to 10 bar with the outside air. Tension spring arrangement according to one of the preceding Claims, characterized in that a parallel to the tension spring acting Motion damping element with one end to the body and the other end is hinged to a pivot point of the flap. Tension spring arrangement according to claim 15, characterized in that that the movement damping element an oil damper is.