Muffler with variable acoustic properties

• US 20040216950A1
• Filed: 04/27/2004
• Published: 11/04/2004
• Est. Priority Date: 04/29/2003
• Status: Active Grant

• Current Assignee: Heinrich Gillet GmbH (Apollo Global Management, Inc.)
• Original Assignee: Heinrich Gillet GmbH (Apollo Global Management, Inc.)
• Inventors: Hirschberger, Katja, Burkart, Michael, Fuhrmann, Bernd, Weinert, Rico, Schinko, Alexander
• Granted Patent: US 7,182,171 B2
• Time in Patent Office: Days
• US Class Current: 181/237
• CPC Class Codes: F01N 1/16 by using movable parts
• CPC Class Codes: F01N 1/165 for adjusting flow area
• CPC Class Codes: F01N 13/14 having thermal insulation exhaust manifolds F01N13/102
• CPC Class Codes: Y10T 137/7925 Piston-type valves
• CPC Class Codes: Y10T 137/7929 Spring coaxial with valve
• CPC Class Codes: Y10T 137/7935 Head slides on guide-rod concentric with spring

Abstract

A muffler with variable acoustic properties. A pressure cell with a diaphragm, a spring, a piston, a piston rod, a closing element on the piston rod, and a pressure connection line are integrated into a housing. The diaphragm is thermally insulated against the piston rod. Another layer of thermal insulation is provided between the closing element and the pressure cell.

Claims

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 bursing arranged in the housing for the piston rod, the closing element being movably 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; and

a layer of thermal insulation located between the closing element and the pressure cell.

2. The muffler according to claim 1, and further comprising two insulating disks arranged so as to insulate the diaphragm against the piston and the piston rod.

3. The muffler according to claim 1, wherein the layer of thermal insulation is enclosed by a protective housing.

4. The muffler according to claim 1, wherein the pressure connection line is integrated into the piston rod.

5. The muffler according to claim 1, wherein the piston has a low-pressure side connected to outside atmosphere.

6. The muffler according to claim 2, wherein the piston rod, the diaphragm, the piston, the insulating disks, and the spring form a package that is supported on a wire cushion with freedom of axial movement.