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:
Nov. 04, 1980
Filed:
Apr. 17, 1979
Herbert Alf, Ludwigsburg, DE;
Volker Ernst, Sachsenheim, DE;
Rudi Hainle, Ludwigsburg, DE;
Rudolf Leipelt, Oberstenfeld, DE;
Filterwerke Mann & Hummel GmbH, Ludwigsburg, DE;
Abstract
A device for adjusting the intake air temperature of a carburetor-equipped internal combustion engine whose air intake system has a flapper valve in a duct junction admitting cold raw air and/or preheated raw air to the intake filter, depending on the raw air temperature, the flapper valve position being controlled by a pneumatic membrane actuator which receives negative pressure from the intake manifold, via a vacuum line with a thermostat-controlled relief valve responsive to the temperature of the air mixture. In the drive connection between the membrane actuator and the flapper is arranged a wax thermostat which increases or decreases the effective length of the connection in response to the ambient air temperature, thereby adding the thermostat displacements to the actuator displacements, the effective length of the drive connection being further adjustable by means of a threaded connection which is arranged between the membrane support body of the actuator and the wax thermostat.