DE1601756C - Double-acting, pneumatic control piston-cylinder unit - Google Patents

Description

adjoining damping chamber B is closed off by a deformable membrane 15 which is sealingly connected on the one hand to the axis of the stationary piston 12 and on the other hand to the free edge of the control piston 5.

The mode of operation is as follows: If there is a pressure ρ in the working chamber 4 and compressed air, the pressure p 'of which is greater than the pressure p, is introduced into the working chamber 3 through the opening 6, it acts on the control piston S and displaces it in the direction of the arrow 17. Accordingly, pushing the control piston 5 which is present in the damping chambers a and B pressure fluid, for example oil, from the damping chamber a through the damping passage 16 into the damping chamber as a result, an attenuation of the control piston is S. as a result of out of the damping chamber a in the pressure fluid passing over the damping chamber B must increase the volume of the damping chamber B , that is, the membrane IS, thanks to its flexible design, allows such an increase in volume.

If the movement of the control piston 5 takes place in the opposite direction according to the arrow 18, that is, the working chamber 3 has the pressure ρ and compressed air with the higher pressure p ' is supplied through the opening 7, then this pressure p' acts on the membrane 15, which transfers it to the pressure fluid in the damping chamber B. The pressure fluid is accordingly passed through the damping passage, which is a calibrated opening in the wall of the stationary piston 12, into the damping space A

ίο printed. Characterized the movement of the control piston 5 in the direction of arrow 18 in accordance with the air flowing into the damping chamber A spinning liquid volume is attenuated.

An additional advantage of the control piston-cylinder unit according to the invention is to be seen that as a result there is no risk of emulsion formation due to the lack of contact between compressed air and hydraulic fluid.

The area of the stationary piston 12 can be equal to, larger or smaller than the area of the control piston 5 choose this way the strength of the damping in one sense or the other to change.

1 sheet of drawings

Claims (2)

JS 1 6öl 756 1 2 fung chambers from a deformable membrane patent claims: is closed, on the one hand with the axis of the stationary piston and on the other hand with the free 1. Double-acting, pneumatic control piston edge of the control piston is sealingly connected. Ben-cylinder unit with two control pressures 5 The advantage of the working chambers according to the invention, which are subject to the control piston, on both sides of the cylinder unit is not only that none of the control piston, which is firmly connected to a seal sliding with the cylinder between air and pressure, is stationary Piston fluid or oil is present, that rather the slidable one, which two fluid-filled, deformable membrane forms an absolutely tight damping chamber enclosed by the control piston, but it should also be emphasized that the mern with oppositely variable. Avoidance of cavitation without the aid of a menu, which the latter is possible via a damping compensation vessel. The deformable flow passage is connected to one another, because the membrane resembles the existing one, characterized by temperature, in that the volume changes dependent on the fluctuations in volume on the side of the hydraulic piston (12) located in the damping chambers facing away from the control piston (5) see adjacent damping Hydraulic fluid turns off automatically. After they have chamber (B) from a deformable membrane when moving the sliding piston according to (15) is completed, on the one hand with the right on axis the air pressure in the working chamber of the stationary piston and others, no negative pressure zones can occur. the on the other hand, with the free edge of the piston from 20, the membrane is sealed tightly by the sealing connected is. press their edges on the one hand on the axis of the 2. Double-acting, pneumatic control piston and, on the other hand, on the edge of the ben-cylinder unit according to claim 1, characterized in that displaceable pistons are ensured, being identified as that the damping passage is to be mentioned in an additional advantage that thereby each in a manner known per se, a calibrated opening 25 contamination of the hydraulic fluid in the (16) is prevented in the wall of the stationary piston (12) damping chambers. The attenuation is protected against any contamination and can't sit down. In addition, will usually the passages with one 30 diameter chosen so that there would be no risk of soiling even if during the assembly Melt particles in the hydraulic fluid The invention relates to a double-acting, should be pneumatic. Automatic control piston ^ cylinder unit with two working chambers, which are subject to control pressures and which are already connected to both sides of the control piston, which is known on one side, is not necessary in the subject matter of the invention, firmly connected to the cylinder. stationary KoI- because the control piston-cylinder piston according to the invention is displaceable, which two liquid-filled, unit is intended for use wherever damping enclosed by the control piston, the damping and thus the damping diameters with oppositely variable volume 40 should not change, for example in Truck compartment, the latter via a damping drive,
let them be connected to each other. The invention is described below with reference to an in There is a control piston-cylinder unit of this embodiment shown in the drawing near- Design known (USA.-Patent 2 664 859), explained in her, which is shown in axial section. of a sliding seal between the pressure 45 The double-acting, pneumatic air in the working cylinders and the fluidic control piston-cylinder unit consists of filled damping chambers takes place. Such a cylinder 1, the cavity of which is covered by a Seal is not absolutely tight, since a kel 2 is always sealed tight. On both sides a certain leakage loss of hydraulic fluid or a control piston 5 are two of the corresponding Damping oil will enter. In addition, a control pressure must be supplied to 50 corresponding openings 6 and 7. Reservoirs for hydraulic fluid can be provided, subordinate working chambers 3 and 4 are not provided. dcr look up under the influence of temperature changes. The control piston 5 acts via a piston trctende volume changes of the hydraulic fluid in rod 8 to the outside, which in an axial bearing 10 compensates for the damping comb edges. Is guided without a sol and sealed by means of a seal 9. this compensation tank could be in the pressure chambers 55. The control piston 5 with its jacket 11 is a Low pressure zones occur, the cavitations herncrscits on a with the cylinder 1 firmly connected can call out. those, stationary piston 12 displaceable and different The object on which the invention is based is dererscits with its outer wall in the cylinder 1 seen therein, a control piston-cylinder introduces. The sealing is carried out in each case by means of Dichhit according to the preamble of the main claim to 60 lines 13 and 14. create, in which, on the one hand, an absolutely tight seal 13er stationary piston 12 divides two fluid-sealed seal between the compressed air in the Arbcitskam- filled, from the control piston 5 by means of its jacket 11 mern and the oil in the damping numbers gc- enclosed damping chambers Λ and B with cnt- wiilirlcist and / to prevent others from the occurrence of inconsistencies in variable volume, which ultimately turrinick / niicn and cavitation is avoided. 65 lere with one another via a steaming passage 16 According to the invention, this task is thereby connected to μυ. solves, (liili the HrriiuliingsgcmiiU applied to the sleeve piston is that on the control piston SuIi; (Ius stationary piston adjoining damping 5 nhguwundtcu side of the stationary piston H2