DE7311390U1 - Guide sliding ring arrangement - Google Patents

Description

The invention relates to a guide sliding ring made of wearable plastic which is inserted in a one-piece or divided circumferential groove of a piston movable in a cylinder and which is pressed against the cylinder wall by means of an elastic spring ring located in the base of the groove.

It is known that piston guide rings made of plastic are used for pneumatically and hydraulically actuated working cylinders. Metallic pistons that do not have any special guide elements must have a narrow and therefore expensive mount on the outside diameter over the entire width of the contact surface in order to ensure a jam-free piston guide in the cylinder. Nevertheless, with greater piston transverse forces and insufficient lubrication, even when using expensive bearing materials, there is a risk of the piston sticking.

Piston guide rings made of plastic as cheap and easily replaceable wear parts provide a remedy here in a known manner. It is also known that rubber rings are used as spring elements for pressing the piston guide bearing against the cylinder wall. The previously known rubber rings, however, have the disadvantage that the groove introduced in the piston to accommodate the piston guide and rubber ring must be designed in such a way that the The displacement volume required for the rubber ring is available. This is necessary because natural rubber or synthetic rubber is known to be incompatible and thus requires a free deformation space, but free, predominantly metallic deposits settle in this free groove space and lead to immobility due to heavy contamination of the piston guide bearing.

The invention is based on the object of eliminating this disadvantage and of creating a sliding ring arrangement which enables the piston to work with precise guidance and without wear. For this it is necessary that the piston groove for receiving the guide sliding ring and the spring ring is filled in a sealing manner in all load phases and regardless of the state of wear of the guide sliding ring.

According to the invention, this object is achieved in slip rings of the type described in detail in that the volume between the groove base and the guide slip ring over the full width of the guide slip ring, regardless of the load and abrasion of the guide slip ring, is achieved by the spring ring made of cellular elastic polyurethane elastomer
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is.

Furthermore, according to the invention, a sliding ring is created which, through the uniform introduction of force by the spring ring, ensures a specific surface support on the cylinder wall that is uniform over the entire load surface with parallel guidance.

An exemplary embodiment of the invention is described below with reference to FIGS. 1 and 2.

It shows

1 shows a sliding ring in the spring ring shown in section, the piston being drawn in a split design.

FIG. 2 shows an illustration of FIG. 1, but with a one-piece piston.

According to Figure 1, a pneumatically and hydraulically displaceable working cylinder is shown, which shows the cylinder 1 with the piston 2, which is composed of the molded parts 3, 3 '. The molded piston parts 3, 3 ′ are screwed together to form a unit on the piston rod 6 by means of the nut 4 and the washer 5. The assembled piston 2 has a circumferential groove 7 in which the guide sliding ring 8 with the spring ring 9 is seated. Seals 10 and 11 can have different shapes, but they are not used to guide the piston. The spring ring 9 falls under slight bias the space between the groove base 12 and guide sliding ring 8 and thus prevents lateral penetration and
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by foreign particles, whereby the radial tension of the guide sliding ring 8 was significantly changed or canceled. The split piston feed enables the spring ring 9 and the guide sliding ring 8 to be placed easily.

FIG. 2 shows a one-piece piston design, the piston 2 being screwed directly onto the piston rod 6 by means of a thread. The groove 7 is in the piston 2
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and takes on the spring ring 9 and the guide sliding ring 8.

the
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of the spring ring is designed so that even if the guide sliding ring is worn and the piston is under unfavorable transverse loading, the piston outer wall does not come into contact with the inner sliding surface of the cylinder. A spring ring design is conceivable in which sealing lips are actually assigned to the spring ring in such a way that they come to lie between the side walls of the groove and the narrow sides of the guide sliding ring and slightly overhang
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of the piston
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Claims (2)

1.) In a one-piece or divided circumferential groove of a movable piston in a cylinder guide sliding ring made of wearable plastic, which is pressed against the cylinder wall by means of an elastic spring ring located in the groove base, characterized in that the spring ring made of cell-elastic polyurethane elastomer (9) the volume between the groove base (12) and the guide sliding ring (8) can be completely filled over the full width of the guide sliding ring (8) regardless of the load and abrasion of the guide sliding ring. 2.) guide sliding ring according to claim 1, characterized in that the spring ring (9) fills the space between the groove base (12) and guide sliding ring (8) in such a way that the side walls of the groove (7) can be sealed.