DE2736657A1 - PISTON RING SEAL - Google Patents

Description

Bernard, Joachim, Joseph Rottink, Kappelhofsweg 16, Delden (o) Netherlands

"Piston ring seal"

The property right relates to a piston ring seal for piston-cylinder assemblies exposed to high pressures, with an in the groove of the piston arranged, outwardly tensioning piston ring.

Piston ring seals work with a piston ring which, due to its inherent elasticity, radially outwards against the Representing cylinder running surface exciting annular sealing element. In internal combustion engines, for example, the piston ring closes the passage of gas from the combustion chamber Crankcase and on the other hand the oil passage in reverse Direction prevented. Its contact pressure is thereby due to the pressure of the gases on its inside, i.e. behind it reinforced.

If the pressures to be generated by the cylinder or to move the cylinder are very high, so are those on the piston ring Radially outwardly acting pressures are very high, so that there are very high signs of wear on the cylinder surface caused by the face of the piston ring. The use of such piston rings and thus the piston ring seal

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such facilities were therefore problematic and often impossible.

The invention is based on the object of a piston ring seal to create, based on the known piston ring designs, the use of the piston ring seal in devices allows working with high pressures.

This object on which the invention is based is achieved, on the one hand, by a bottom which rises upwards and outwards the groove in the piston that receives the piston ring.

Through this upwardly and outwardly rising bottom of the groove, a moving force of the radially outwardly directed Piston ring opposing force is created, which is able to apply the frictional forces to the outside of the piston ring to limit the inside of the cylinder wall and thus signs of wear to diminish.

Another possibility, the object on which the invention is based to solve is seen in the fact that another piston ring is provided, which is placed in the groove of the piston, but in the In contrast to the main piston ring, it tensions inwards, i.e. tightly against the inside of the vertical wall of the groove in the piston creates and thereby prevents that the gas pressure can reach the inside of the main piston ring and this is now in undesirably high presses outwards.

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According to the invention, both proposed solutions can also be used in combination and it can according to the invention Finally, the procedure is also such that additional spring means are provided for the piston ring which is tensioned outward which are thus able to counteract the otherwise outwardly acting forces acting on the piston ring replace so that a sufficiently tight contact between the front of the piston ring and the cylinder wall is possible.

An exemplary embodiment of the invention is explained below with reference to the drawings. The drawings show in

Fig. 1 is a view of a first possible solution to the problem on which the invention is based, in

Fig. 2 shows a second possible solution to the problem underlying the invention, in

3 shows a combination of the embodiment according to FIGS. 1 and 2 and in

4 shows a modified embodiment according to the invention.

In the drawings, generally indicated at 1 is a piston which is movable up and down within a cylinder, wherein part of the cylinder wall is shown at 2. According to FIG. 1, the piston has a groove 3 which accommodates a piston ring 4 is used with its outer peripheral side on the

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The running surface of the cylinder wall 2 rests.

In the illustrated embodiment, the Nat 3 is designed so that the bottom side of the groove faces outwards and upwards increases, so that the piston ring 4 resting on this bottom side is forced to move radially outward to rise according to the angle of inclination of the floor, against the pressure acting on its top.

The underside of the piston ring 4 is designed so that its angle of inclination corresponds to the angle of inclination of the bottom of the groove corresponds, such that the top of the piston ring is aligned perpendicular to the axis of movement of the cylinder.

In the embodiment shown in Fig. 2, a piston ring 4a is arranged in the groove 3a of a cylinder 1a, wherein the bottom of the groove is flat, i.e. perpendicular to the cylinder's axis of movement and the piston ring in on is also known to be designed flat with its bottom and top. The groove 3a is shown in FIG Embodiment chosen so large that two piston rings can be received by it, in addition the piston ring 5. While in the embodiment according to FIGS. 1 and 2, the main piston ring 4 or 4a in a manner known per se is designed to be exciting to the outside, such that it rests against the cylinder wall with a certain contact pressure

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the piston ring 5 according to the embodiment shown in FIG. 2 is designed to be inwardly exciting, so that it is attached to the inner wall the groove 3a rests and in this way prevents a flow of the pressure medium behind the piston ring 4a with security, wherein it is pressed onto the top of the piston ring 4a by the pressure exerted on the top of the piston ring 4a will. It can be seen that this embodiment creates an additional load due to the gas or hydraulic pressure acting on it on the piston ring such that the piston ring 4a is moved outward. This will reduce the wear and tear switched off with certainty in the area of the wall of the cylinder.

The same is achieved by the embodiment shown in FIG. 1 due to the forced movement resistance.

In the embodiment shown in FIG. 3, the possible solution according to FIG. 1 is matched with the possible solution according to FIG. combined in such a way that a considerable resistance to the outward movement of the piston ring is created here is, in addition, it is also prevented that gas pressure can act on the back of the piston ring.

In the embodiment shown in FIG. 4, the piston ring is 4c equipped with an additional spring means 6 which tries to move the piston ring 4c outwards.

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In Fig. 3, the piston ring stretching outward is denoted by 4b and the piston ring stretching inward is denoted by 5a, while the groove which receives these two rings has the reference number 3b.

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Claims (6)

PATENT LAWYER PIPL-INQ. H.-Q. HABBEL POSTfACt. J «» - D-4400 MtVNSTfR 11-8.197 AM ^ AIJONtN ^ RABEN 11 · TbLtH) N (os ^ i) «sy IELEX W8 8V7 .u X / Sc MY FILES: (please specify) N 3/6477 Bernard, Joachim, Joseph Rottink, Kappelhofsweg 16, Delden (o) the Netherlands "Piston ring seal" claims; 1. Piston ring seal for piston-cylinder assemblies exposed to high pressures, with an outwardly tensioning piston ring located in the groove of the piston, characterized by an upwardly and outwardly rising bottom of the piston ring (4, 4b) receiving groove (3, 3b) in the piston (1, 1b). 909808/0438 ORIGINAL INSPECTED 2. Piston ring seal for piston-cylinder assemblies exposed to high pressures, with an outwardly tensioning piston ring arranged in the groove of the piston, characterized by a further, inwardly tensioning piston ring (5, arranged in the groove (3a) of the piston (1a)) 5a). 3. Piston ring seal according to claim 2, characterized by an outwardly rising bottom of the groove of the piston according to claim 1. 4. Piston ring seal according to claim 2 to 3, characterized by additional spring means (6) for the outwardly tensioning ring. 5. Piston ring seal according to claim 1, characterized in that the underside of the piston ring is bevelled to match the inclination of the bottom side of the groove. 6. Piston ring seal according to claim 1 and 5, characterized in that the top of the piston ring is aligned perpendicular to the axis of movement of the piston. 909803/0438