Mufflers for use with engine retarders; and methods

US6354398B1 · kind B1 · utility

Assignee

• Donaldson Company, Inc. · US

Inventors

• Theodore G. Angelo · Windom, US
• John Edward Hamrin · Bemidji, US
• Eivind Stenersen · River Falls, US
• John Hiemstra · Lakeville, US
• Wayne M. Wagner · Apple Valley, US
• Ted J. Wiegandt · Bloomington, US

Key dates

• Filing date: May 16, 2000
• Grant date: Mar 12, 2002
• Expiry date: May 16, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01N2490/20
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

A muffler is described for muffling both positive power and compression brake type engine retarders. The muffler includes an outer shell defining an internal volume. A first, inner, perforated wall is spaced from the outer shell and defines a first, annular, volume therebetween. A first volume of packing material is positioned within the annular volume. An inlet tube is oriented within the internal volume. In certain embodiments, the inner perforated wall circumscribes at least a portion of the inlet tube, and extends a distance of at least 25% of the axial length of the outer wall. Both single and dual muffler systems are described. Methods of use and operation are also provided.