DE202006002338U1 - Hydraulic cylinder unit for door-closer, includes loading-defined pattern of laser-cut oil lubrication recesses in running surfaces of piston and cylinder - Google Patents

Abstract

Oil lubrication recesses (6, 7) are optionally included in running surfaces (3, 5) of the cylinder (2) and/or piston (4). The recesses are varied in terms of their shape, size, depth and pattern, in accordance with the loading arising. They are formed by controlled removal of material. They may be round, polygonal, oval or slotted.

Description

The The invention relates to a piston / cylinder unit of a hydraulic Door closer according to the preamble of claim 1.

In a generic piston / cylinder unit 1 a hydraulic door closer, as exemplified in 4 is shown schematically simplified, the rotational movement of a door in the interior of the door closer is converted into a stroke h, which is based on a piston 1' is transmitted. With the piston stroke, a hydraulic fluid is displaced. This in turn is via an adjustable valve 2 ' throttled and in a closed oil circuit 3 ' an unpressurized room 4 ' of the cylinder 8th' fed. Due to the forces of a door closer spring 5 ' become the piston 1' and the cylinder 8th' extremely stressed. There are also lateral forces caused by the arrow 6 ' are symbolized, leading to a strong edge pressure (arrows 7 ' ) between pistons 1' and cylinders 8th' to lead. Due to the low lifting speed and due to a deficient lubricating film, it can in the generic construction for eating the piston 1' and the cylinder 8th' come.

It is therefore an object of the present invention, a piston / cylinder unit a hydraulic door closer to create, with a simple design, a seizure of the piston and the Cylinders can avoid due to the loads occurring.

By the provision of oil lubrication pockets, the either in the cylinder surface of the cylinder, the piston tread the piston or arranged both in the cylinder surface and in the piston tread can be results in an improvement of the sliding properties between cylinders and pistons. This will provide an optimized lubrication control achieved the life of the piston / cylinder unit and thus of the entire door closer increases, wherein at the same time its components are optimized.

The under claims have advantageous developments of the invention to the content.

Preferably Is it possible, the oil lubrication pockets by a controlled material removal by laser technology (z. B. Femtolaser) produce. Here, the laser beam is very precise the surface to be processed focused, which achieves a removal depth of less than 0.01 mm is.

By a corresponding programming of the laser beam guidance can form, Size, depth and Pattern of oil lubrication bags for the respective load optimized in the said running surfaces of the cylinder and / or the piston are introduced automatically.

alternative Is it possible, the oil lubrication pockets by etching manufacture.

The Shape of oil lubrication pockets is arbitrary in principle. It is mainly round (preferably circular), oval, square (preferably square) or oblong Trainings. It is also possible the arrangement pattern to vary.

Further Details, features and advantages of the invention will become apparent following description of embodiments with reference to the drawings.

It demonstrate:

1 : A schematically greatly simplified sectional view of a piston / cylinder unit according to the invention;

2a - 2e : Examples of possible forms of oil lubrication pockets and their conceivable arrangement patterns;

3 : A sectional view of a piston or cylinder surface with introduced oil pockets and

4 , one of the 1 corresponding representation of the above-mentioned generic piston / cylinder unit.

In 1 is a sectional partial view of a piston / cylinder unit according to the invention 1 a hydraulic door closer represented. The representation of the door closer is limited to the parts that are required to explain this invention. In addition to the 1 Obvious parts, such a door closer naturally all other parts known to the expert, but in 1 are not shown because they have no meaning for the understanding of the present invention.

The piston / cylinder unit 1 has a cylinder 2 on, the one inside cylinder tread 3 includes.

In the cylinder 2 is a piston 4 guided, which has an outside piston tread 5 having. This acts to guide the piston 4 with the cylinder surface 3 together, which due to the loads occurring at the outset explained and in 4 illustrated problems of the generic piston / cylinder unit 1 can lead.

To avoid these problems are in the piston / cylinder unit according to the invention 1 Oil lubrication pockets 6 and 7 intended. In 1 are the oil lubrication pockets 6 in the cylinder surface 3 whereas the oil lubrication pockets 7 of which in 1 only representative of an oil pocket is shown in the piston tread 5 are arranged. However, as explained above, it is also possible that either only in the cylinder surface 3 or only in the piston tread 5 appropriate oil lubrication pockets are provided.

To complete the description of the piston / cylinder unit according to the invention 1 should be emphasized that this, as usual, a door closer spring 8th that is in the cylinder 2 is arranged and the forces acting on the piston 4 transfers. There is also an adjustable valve 9 provided that throttles the displaced hydraulic fluid as in known door closers and in a closed circuit to a non-pressurized space 10 of the cylinder 2 returns.

Because the oil lubrication pockets 6 and 7 be adapted in shape, size, depth and arrangement patterns to the loads occurring in each case, there are a variety of conceivable variations of this size.

Accordingly, in the 2a to 2e exemplary different forms of oil lubrication pockets 6 and 7 as well as different arrangement patterns.

For the disclosure of these examples is hereby explicitly to the drawings of the 2a to 2e which are self-explanatory without further explanation.

In 3 is a sectional view through the cylinder surface 3 or the piston tread 5 shown, in the example, three different configurations of oil lubrication pockets 6a to 6c (respectively. 7a to 7c ) are drawn.

The oil grease bag 6a ( 7a ) is half round. The oil grease bag 6b ( 7b ) shows a frustoconical cross-section. The oil grease bag 6c ( 7c ), however, shows a dovetail-like design of an oil lubrication bag. These representations are purely exemplary and are intended to illustrate that, in addition to the different forms that arise from the plan views according to the 2a and 2 B may also give different cross-sectional shapes and depths for the oil lubrication pockets, as exemplified in the 3 are shown.

1

Piston / cylinder unit

1'

piston

2

cylinder

2 '

Valve

3

Cylinder surface

3 '

Oil circuit

4

piston

4 '

unpressurized room

5

Piston tread

5 '

Door closer spring

6 6a-6c

Oil lubrication pockets

6 ', 7'

arrow

7, 7a-7c

Oil lubrication pockets

8th

Door closer spring

8th'

cylinder

9

Valve

10

unpressurized room

H

stroke movement

Claims (4)

Piston / Cylinder Unit ( 1 ) of a hydraulic door closer, - with a cylinder ( 2 ), which has an inner cylinder surface ( 3 ) having; - with one in the cylinder ( 2 ) guided piston ( 4 ), which has an outside with the cylinder surface ( 3 ) cooperating piston tread ( 5 ), characterized in that - optionally in the cylinder surface ( 3 ) and / or the piston tread ( 5 ) Oil lubrication bags ( 6 . 7 ; 6a - 6c ; 7a - 7c ) are arranged. Piston / Cylinder Unit ( 1 ) according to claim 1, characterized in that the oil lubrication pockets ( 6 . 7 ; 6a - 6c ; 7a - 7c ) are variable in shape, size, depth and arrangement pattern according to the loads occurring. Piston / Cylinder Unit ( 1 ) according to claim 1 or 2, characterized in that the oil lubrication pockets ( 6 . 7 ; 6a - 6c ; 7a - 7c ) can be produced by controlled material removal. Piston / Cylinder Unit ( 1 ) according to one of claims 1 to 3, characterized in that the oil lubrication pockets ( 6 . 7 ; 6a - 6c ; 7a - 7c ) are round, angular, oval or oblong hole-like.