04-07-2010, 05:35 PM
Ball piston engine
The original concept was introduced in 1990. Then it utilised a modified version of the tried and tested otto cycle. The number of strokes were 4, 8 and 12 or more. There may be one or more pistons. Each of them is inside a cylinder. A hot gas or a gas under pressure is introduced. The machine design concept is applicable as a compressor, pump, motor, or engine. This engine is based on spherical ball pistons and hence the moving part count is less, power to weight ratio is high, f valve train and water cooling systems are eliminated and there is a good dynamic balance.
The inertial loads(which contributes to sliding friction) has been completely eliminated by a novel kinematic design. a small clearance is kept on the ball piston to avoid the use of piston rings for reducing the leakage. As a result, there is a choked flow across the piston. The above described features provide the scope for a engine with higher efficiency than conventional piston engines.The silicon nitride ball pistons technology has been utilized by the engine preventing the need of a large developmental effort.
http://papers.sae970066/
http://www.ballpistonengine
http://www.convergence-engproject_files/The_Ball_Piston_Engine_Testing.doc
for a presentation, visit this link:
http://www.scribddoc/11835319/Ball-Piston
http://www.scribddoc/29379090/The-Ball-Piston-Engine
The original concept was introduced in 1990. Then it utilised a modified version of the tried and tested otto cycle. The number of strokes were 4, 8 and 12 or more. There may be one or more pistons. Each of them is inside a cylinder. A hot gas or a gas under pressure is introduced. The machine design concept is applicable as a compressor, pump, motor, or engine. This engine is based on spherical ball pistons and hence the moving part count is less, power to weight ratio is high, f valve train and water cooling systems are eliminated and there is a good dynamic balance.
The inertial loads(which contributes to sliding friction) has been completely eliminated by a novel kinematic design. a small clearance is kept on the ball piston to avoid the use of piston rings for reducing the leakage. As a result, there is a choked flow across the piston. The above described features provide the scope for a engine with higher efficiency than conventional piston engines.The silicon nitride ball pistons technology has been utilized by the engine preventing the need of a large developmental effort.
http://papers.sae970066/
http://www.ballpistonengine
http://www.convergence-engproject_files/The_Ball_Piston_Engine_Testing.doc
for a presentation, visit this link:
http://www.scribddoc/11835319/Ball-Piston
http://www.scribddoc/29379090/The-Ball-Piston-Engine