Expansible chamber devices – Fluid conduit or port in fixed wall of working chamber
Patent
1990-01-09
1992-06-16
Look, Edward K.
Expansible chamber devices
Fluid conduit or port in fixed wall of working chamber
92248, 60588, F01B 3100, B60T 1126
Patent
active
051216868
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a piston-cylinder assembly of plastic material, of glass fibre reinforced plastic, for a master assembly for hydraulic systems in automotive vehicles, and to a process and an apparatus for its manufacture.
In the published German patent application No. 3149628.8, a ball-and-socket joint connection is described between a push rod furnished with a ball head and a pressure element, between the push rod and a piston of a hydraulic brake power booster or master cylinder. The push rod is swingably inserted in a base bore of the piston and a retaining element which simultaneously serves as a reinforcing element and partly surrounds the ball head being arranged between the base bore and the ball head. It is proposed in the patent application that the retaining element is provided with a plurality of elastic projections some of which are formed with offsets which back-grip the ball, whereas the others abut with an initial stress against the wall of the base bore.
In International Patent Application No. WO 87/03344 (PCT application) a cylinder is disclosed which is applied in a hydraulic system. The cylinder is composed of two parts. Each part is made of plastic material. One part comprises an external shell which presents an opening. An end wall is provided at the opposite end. The other part comprises an internal bushing. The bushing is precision-fitted within the shell. It extends from the forementioned open end to the fore-mentioned end wall. The end of the forementioned bushing which is disposed distant from the open end is located at a distance from the end wall. A cylindrical bore is provided in the bushing. A piston is slidingly arranged within the bore. The piston can move in the direction of the end wall and away from the end wall.
Sealing means are provided which abut against the circumference of the piston. The sealing means are retained between the internal end of the bushing and the opposite surface of the shell. A pressure chamber is arranged between the end wall and the piston.
Furthermore, a hydraulic master cylinder is described in the British patent application No. GB 2071797A which comprises a cylinder and a supply tank manufactured separately. The supply tank is fastened on the cylinder. The supply tank and the cylinder are interconnected in such a manner that hydraulic fluid may flow between the supply tank and the cylinder during operation. The supply tank has projecting arms which are in abutment against the outside cylinder wall, against opposite sides of the cylinder. These arms serve to keep the supply tank and the cylinder together, so that they can be put into operation jointly. The supply tank is made of plastic material.
Known piston-cylinder assemblies have a complicated set-up which is unsuitable for mass production. In many cases, metal supporting or reinforcing elements are required, since the plastic bodies alone are not capable of absorbing the mechanical forces. In addition, the known assemblies require expensive mechanical machining.
Accordingly, the invention has the following objects: In piston-cylinder assemblies, particularly in clutch master assemblies, the sealing cup which serves to seal the piston within the cylinder frequently is passed over uncontrollably. In many cases, the reason is that the cup has an axial play. It is one of the objects of the invention to achieve a positioning of the cup without such axial play. It has been proposed to provide springs and sheet metal elements to exert an axial pressure on the cup and, thus, to contribute to the positioning of the cup. The combination of plastic material elements and sheet metal elements is unfavorable because this leads to malfunctioning and reduces the service life of the piston-cylinder assembly. In addition, such a combination is expensive, in particular for mass production, and does not allow automation with regard to the manufacture and to mounting. Therefore, it is another object of the present invention to render such sheet metal elements and springs s
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Birkenbach Alfred
Harth Ralf
Ritter Wolfgang
Schonlau Juergen
Alfred Teves GmbH
Lewis J. Gordon
Look Edward K.
Ryznic John
Seitter Robert P.
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