Compression relief engine brake

Patent · Tue Oct 06 04:00:00 EDT 1987

OSTI ID:5853987

Meneely, V A

A compression relief brake is described for four cycle internal-combustion engines, comprising: a pressurized oil supply; means for selectively pressurizing a hydraulic circuit with oil from the oil supply; a master piston and cylinder communicating with a slave piston and cylinder via the hydraulic circuit; an engine exhaust valve mechanically coupled to the engine and timed to open during the exhaust cycle of the engine the exhaust valve coupled to the slave piston. The exhaust valve is spring-based in a closed state to contact a valve seat; a sleeve frictionally and slidably disposed within a cavity defined by the slave piston which cavity communicates with the hydraulic circuit. When the hydraulic circuit is selectively pressurized and the engine is operating the sleeve entraps an incompressible volume of oil within the cavity to generate a displacement of the slave piston within the slave cylinder, whereby a first gap is maintained between the exhaust valve and its associated seat; and means for reciprocally activating the master piston for increasing the pressure within the previously pressurized hydraulic circuit during at least a portion of the expansion cycle of the engine whereby a second gap is reciprocally maintained between the exhaust valve and its associated seat.

• Assignee: NOV; EDB-88-009357; NOV-88-086101
• Patent Number(s): US 4697558
• OSTI ID: 5853987
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
BRAKES
COMPRESSION
CONTROL EQUIPMENT
CYLINDERS
DESIGN
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
FLOW REGULATORS
FLUID MECHANICS
FLUIDS
HEAT ENGINES
HYDRAULIC FLUIDS
HYDRAULICS
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICS
OPERATION
PISTONS
PRESSURE DEPENDENCE
PRESSURIZING
RELIEF VALVES
VALVES
WORKING FLUIDS