Diesel Engine Retarders, Inc.

Jacobs Brake Technology Corporation

Gregory T Davies

Dennis R Custer

Norman Schaefer

An exhaust brake for an internal combustion engine is disclosed. The internal surfaces of the exhaust brake are aerodynamically shaped and sized to reduce the incidence of turbulent flow through the exhaust brake. The shape of the internal passage through the brake housing may be dictated by the requirement of maintaining as close to a laminar flow through the passage as possible when the brake valve is open. The ideal brake housings of the internal passage may be determined for exhaust brakes of various shapes and sizes. The ideal shapes may be typified as having non-uniform wall thicknesses. The ideal shapes of the internal brake surfaces, including that of the valve, may also be typified by the elimination of square edges (which trigger turbulence). Ideal flow through the exhaust brake may also be obtained by the reduction of bulk in the exhaust flow (minimization of the profile of the valve in the flow when the valve is open). The valve preferably has a tapered or airfoil profile, which may help reduce the valve's contribution to turbulent flow in the brake.

Low restriction exhaust brake

In a compression release engine braking system for a turbocharged internal combustion engine, excessive stress associated with opening the exhaust valves of the engine near top dead center of engine compression strokes when the engine is turning at high speed is prevented by reducing the intake manifold pressure from what it otherwise would be at that high speed. This is done by retarding the turbocharger so that its speed is less than it otherwise would be at high engine speed. Turbocharger retarding can be accomplished in any of several ways such as by restricting the flow of engine exhaust gas to or from the turbocharger, or by allowing a portion of the exhaust gas to bypass the turbocharger.

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Suffield, CT, United States of America

Gregory T Davies