The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 21, 1979
Filed:
Sep. 30, 1976
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A pressurized medium powered device has a motor of the external rotor type, both the stator and the rotor of the motor having registering channels which communicate with one another across an interstice. At least one annular groove is provided in at least one of the rotor and stator components of the motor at the interstice, and at least one annular sealing element, such as an O-ring or a slotted ring of rectangular cross-sectional configuration is received in the annular groove with axial and radial play and is pressed into sealing contact with the components, and into sliding contact with at least one of the components, by the pressure of the pessurized medium. An annular depression may be formed in the other component in registry with the annular groove, and the sealing element may be partly received in such depression. At least one of the surfaces which bound the interstice is very smooth, which can be obtained by fine machining, surface contacting, or providing a layer of synthetic plastic material on such surface.