Patent ID: 7182171
Filing Date: 2007-02-27
Classification: F01N,Y10T

Abstract:
1. A muffler with variable acoustic properties for pulsating gases, comprising: a housing; pipes integrated in the housing; an exhaust gas valve integrated in the housing, the exhaust gas valve having a pressure cell containing a diaphragm, a spring, a piston, a piston rod, a closing element on the piston rod, and a pressure connection line; a guide bushing arranged in the housing for the piston rod, the closing element being moveably arranged so as to close off one of the pipes to a greater or lesser extent; the diaphragm being thermally insulated against the piston rod by two insulating disks arranged so as to thermally insulate the diaphragm against the piston and the piston rod, and a layer of thermal insulation located between the closing element and the pressure cell; wherein the layer of thermal insulation is enclosed by a protective housing; and wherein the pressure connection line is integrated into the piston rod.