Patent Number: 6,293,248

Title: Two-cycle compression braking on a four stroke engine using hydraulic lash adjustment

Abstract: A two-cycle compression brake apparatus and braking method is provided according to the invention. The apparatus includes a positive power hydraulic lash adjuster positioned in a travel path of a power rocker arm and being capable of opening an associated at least one valve when a hydraulic fluid is held in the positive power hydraulic lash adjuster, and a compression brake hydraulic lash adjuster positioned on a compression brake rocker arm and positioned over the associated at least one engine valve and being capable of opening the associated at least one valve when a hydraulic fluid is held in the compression brake hydraulic lash adjuster, wherein in a compression braking mode the hydraulic fluid is held in the compression brake hydraulic lash adjuster to actuate the at least one associated valve while the positive power hydraulic lash adjuster does not actuate the at least one associated valve so that at least one exhaust valve is opened near a top dead center position of an associated piston while at least one intake valve is opened near a bottom dead center position of the associated piston to perform the two-cycle engine compression braking.

Inventors: Zsoldos; Jeffrey S. (Mount Airy, MD), Schmidt; Joseph H. (Hagerstown, MD), Bartel; John B. (Hedgesville, WV)

Assignee: Mack Trucks, Inc.

International Classification: F01L 1/24 (20060101); F01L 1/20 (20060101); F01L 13/06 (20060101); F02D 013/04 ()

Expiration Date: 09/25/2018