Title: Double-acting four-cylinder hot gas engine

Abstract: 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.

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Inventors: Bratt, Jan C. (Malmo, SE)
Moodysson, Bengt-Ove M. (Akarp, SE)

Application Number: 896589
Filing Date: 1978-04-14
Publication_date: 1980-04-01
Assignee: Kommanditbolaget United Stirling (Sweden) AB & Co. (Malmo, SE)
Primary Class(es): 123/192.2 123/59.6, 123/62
Other Classes:
US Patent Ref:

1681910	Aug, 1928	Slaght	123/53.
2013163	Sep, 1935	Meyer	123/192.
2051204	Aug, 1936	Elwell	123/62.
2117700	May, 1938	Burkhardt	123/53.
2828601	Apr, 1958	Meijer	60/525.
3074229	Jan, 1963	Baas et al.	60/525.
3537437	Nov, 1970	Paul et al.	123/52.
3563223	Feb, 1971	Ishida	123/192.
3581628	Jun, 1971	Williams	123/192.

Other Refs:
Primary Examiner: Myhre, Charles J.
Assistant Examiner: Yates, Jeffrey L.
Attorney: Finnegan, Henderson, Farabow, Garrett & Dunner