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US 4,195,613 AGranted
Double-acting four-cylinder hot gas engine
AssigneeKommanditbolaget United Stirling (Sweden) AB & Co.
InventorsJan C. Bratt, Bengt-Ove M. Moodysson
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AssigneeKommanditbolaget United Stirling (Sweden) AB & Co.
InventorsJan C. Bratt, Bengt-Ove M. Moodysson
Estimating the term…
Hot gas engine units of the type having four parallel cylinders arranged in two parallel rows of two cylinders per row may be effectively balanced by a minimum of counterweight masses. The engine pistons are connected to two parallel crank shafts and four primary counterweights are positioned on the crankshafts each diametrically opposite a respective crank. The crankshafts engage a common gear wheel rotating opposite to but at the same angular speed as the two crank shafts, and the gear wheel is mounted on a third shaft parallel to the two crank shafts. Secondary counterweights including at least two axially spaced, oppositely directed secondary counterweights positioned on the third shaft are used to cancel the moment about the engine vertical axis produced by the primary counterweights.
A double-acting four-cylinder hot gas engine of the kind in which the cylinders are all parallel with one another and there are two synchronized crank-shafts with crankshaft axes parallel to one another, said crankshafts rotating in the same angular sense, each crank-shaft being connected to two pistons reciprocating along piston axes which intersect the axes of the respective crank-shaft, the intersections being axial spaced along the respective crankshafts, characterized in that for balancing purposes the engine is provided with a third shaft which is parallel to the two crank-shafts, gearing for driving the third shaft in rotation in synchronism with and in the opposite angular direction from the two crank-shafts, and at least two secondary counter-weights carried by the third shaft, which secondary counter-weights are spaced from one another in the axial direction of the third shaft and produce forces during rotation in directions which are diametrically opposite to one another with respect to the axis of the third shaft.
A double-acting four-cylinder hot gas engine of the kind in which the cylinders are parallel with one another and there are two synchronized crank-shafts with crankshaft axes parallel to one another, said crank-shafts rotating in the same angular sense, each crank-shaft being connected to two pistons reciprocating along piston axes which intersect the axes of the respective crank-shaft, the engine comprising:
Dependencies are inferred from the claim text.