Pressure cylinder with composite piston rod and method for preparing a composite piston rod

Abstract

A pressure cylinder comprises a cylinder housing with a cylinder space in which a fitting piston is axially movable. A piston rod (1) of a composite material extends from the piston. The piston rod (1) comprises a layer of core material under a surrounding outer jacket (5). The layer of core material (3) is constructed from composite material fibres oriented parallel to a longitudinal axis of thepiston rod and straightened, and the outer jacket (5) is constructed from composite material fibres wound at an angle relative to the longitudinal axis. Thus provided is a pressure cylinder with a piston rod (1) of relatively light weight, which can withstand a relatively high pressure load. Less composite material is hereby required for the piston rod (1) while the strength remains the same.

Description

technical field [0001] The invention relates to a pressure cylinder comprising a cylinder space delimited by a cylinder housing in which there is an axially displaceable cooperating piston, wherein a piston rod at least substantially made of fiber composite material extends from the piston, the piston The rod essentially comprises a layer of core material under a peripheral jacket. Background technique [0002] Pressure cylinders come in many shapes and sizes and are usually tailored to a specific application. Metal, in particular stainless steel, is usually used here as the material for the cylinder housing, piston rod and piston, because these materials are robust, durable and relatively easy to process, and the raw materials are more affordable. However, metal as the basic material of the pressure cylinder also has disadvantages, especially its relatively high specific gravity. The finished pressure cylinder therefore has a considerable overall weight, which is a disadv...

AI Technical Summary

Problems solved by technology

[0005] Although significant weight savings can be achieved with this known pressure cylinder, it is still not ideal

The structure of alternating straight fibers in the layers of core material and fibers wound around them results in less compaction of the fibers

Especially in the case of compressive strength, it has been found in practice that a comparatively large amount of material is required for the piston rod to ensure a defined loadability, which leads to a high overall weight and volume and, of course, a high cost price

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