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:
Feb. 16, 1999
Filed:
Feb. 20, 1997
Roland Blanz, Heiligkreuzsteinach, DE;
Grau GmbH, , DE;
Abstract
A levelling valve is provided for automatically keeping constant the vehicle height of a commercial vehicle with air suspension. The levelling valve comprises a spring loaded double valve body (17), an inlet seat (18), a hollow control rod (20) having an outlet seat (19) for the double valve body (17) and movable toward sealed engagement with the double valve body (17), an actuation drive (6) having a guiding member (27) and an eccentric follower (10) responsive to the change in vehicle height for moving the control rod (20) towards or away from sealing engagement with the double valve body (17). A first vehicle height according to a closing position may be controlled by the actuation drive (6). A control piston (28) is located in a control chamber (31) in alignment with the axis (3) of the control rod (20) and is provided for the attainment for setting of a second vehicle height. The control chamber (31) is located in the guiding member (27) of the actuation drive (6). The control piston (28) is slidingly and sealingly arranged in the guiding member (27) so that the eccentric follower (10) is not loaded by a force acting on the control piston (28) during the adjusted second vehicle height. The control rod (20) is supported on the control piston (28).