Abstract
For the purpose of improving the engine's power density, we put forward a new type of power transmission mechanism which is used for opposed-cylinder engine. The gas pressure acts on the cam through the piston and push rod, and the spindle rotation of external is driven by the cam. The design of spatial cam work surface is completed by using the enveloping theory of a family of space curves, the force between roller and cam is analyzed using dynamic analysis software. Under the condition of equal number, size and stroke of piston, the new one with larger power density is more compact in structure than the traditional power transmission mechanism, and the reaction force on either side of the main shaft and the acting force between pistons and cyl- inders are smaller than those in traditional one, which prolongs the service life of the pistons.
Highlights
The special space mechanism internal combustion engine has been widely applied in military fields, and familiar ones are cam-type, swash plate-type and wobble plate-type (Peng et al 2007, Yongqing et al 2011)
Having drawn lessons from the workings of a two-stroke internal combustion engine, a part of energy which is from the work of combustible gas is used to improve the engine inlet pressure, which can make the overall structure of the engine more compact
For the novel power transmission mechanism, the pistons are under the gas pressure Fg and reactive force Nb from the wall of cylinders, the convex bosses of push rods receive support from the rack, and the rollers are under the force N from cam
Summary
The special space mechanism internal combustion engine has been widely applied in military fields, and familiar ones are cam-type, swash plate-type and wobble plate-type (Peng et al 2007, Yongqing et al 2011). There are two rollers on a push rod, which contact with both of the cam surfaces, among which one is connected to the push rod through a pin shaft, and the other is installed on the elastic roller seat, which is connected with the push rod through a pin shaft New engine adopts two-stroke cycle model, and the power piston rods and the pressurization piston rods are decorated by 90e. The air in the pressurization cylinder is compressed into the power cylinder through the complex pipeline, which increases the engine inlet pressure(Raman and Ram 2013). When the power piston is in exhaust stroke, the air in pressurization cylinder is compressed into power cylinder, and completing the pressurization of combustible gas
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