Pneumatic components of the general type under consideration are used, for example, in the form of compressors, in particular as piston air compressors, in trucks or passenger cars. The compressor piston has a circumferential groove, in which a grooved ring engages. The grooved ring seals the piston with respect to the cylinder. In order to reduce the production cost, the compressor piston is in part produced by an injection molding process. This mold parting flash must be removed by a machining process in order to be able to draw separately produced rubber grooved rings onto the piston. Without removal of the mold parting flash, the grooved ring does not sit sufficiently tightly on the piston.
A disadvantage of such conventional pneumatic components is therefore the complicated manufacture thereof. In an alternative production process, in order to make the removal of the mold parting flash unnecessary, the rubber ring is first vulcanized in a seated position on the piston. A disadvantage of this is that, for piston diameters of more than 70 mm, this process has such a low degree of reliability that it cannot be used in the course of mass production.
This is because the microlips, despite mold parting flash, provide for an airtight connection between the piston and the grooved ring. The grooved rings can be advantageously produced separately even at a diameter of more than 70 mm and can subsequently be connected to an injection-molded piston.
Within the scope of the present description, the dynamic side refers to that side of the grooved ring that rubs on another component during operation of the pneumatic component. The static side, on the other hand, is that side that, during operation of the pneumatic component, rests relative to the component to which the grooved ring is attached.
In a preferred embodiment, the grooved ring is fastened to the piston such that its static side faces the piston. The advantage thereof is that the piston can be produced from plastic in an injection molding process without having to remove the mold parting flash in a complicated manner, which is unavoidably produced in the process. Producing the piston from plastic results in a piston that is especially easy and simple to produce.
The pneumatic components according to the present invention can be used as an air compressor, in particular for a pneumatic system of a utility vehicle. Alternatively, a pneumatic component according to the invention can be used as a pneumatic actuator, in particular as a pneumatic gearshift control.
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