US Patent: 2,093,433
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| Internal combustion engine
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Patentee:
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| Ambrose Everts Greene (exact or similar names) - Berkeley, CA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 17, 1919 |
| Granted: |
Sep. 21, 1937 |
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Jeff Joslin
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Description: |
| The inventor was deceased at the time the patent was issued. Catherine De Motte Greene/Marshfield/OR was administrator.This patent provides a novel design for an opposed-piston internal combustion engine that was intended to provide the inherent balance benefits of an opposed-piston design while avoiding certain previous disadvantages, and also to permit the use of a range of fuels. The patent claims that previous opposed-piston designs used sleeve pistons where one piston passed inside the other. Such a design has higher losses because each piston has two sliding surfaces, and the lubrication challenges are also doubled. Greene's engine uses a pair of cylinders in a straight line, each with a pair of opposed pistons. The two inner pistons are rigidly connected together with a hollow tie rod and the two outer pistons are rigidly connected together by a tie rod that passes through the center of the inner pistons' tie rod. A cross-head (a short larger-diameter piston) is located between the two inner pistons and connected by connecting rods to each pair of pistons to keep the cross-head centered between the pistons. The crankshaft is connected to the cross-head by connecting rods. The outer pistons are each stepped, i.e., have two different diameters, with a short larger-diameter section on their outer ends. Such a design creates novel lubrication challenges which are addressed. The large-diameter outer ends serve as scavenging pumps and the inner ends act as conventional combustion pistons. |
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