Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
  • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
  • F01B3/04—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis the piston motion being transmitted by curved surfaces
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
  • F01B7/00—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders
  • F01B7/02—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons
  • F01B7/04—Machines or engines with two or more pistons reciprocating within same cylinder or within essentially coaxial cylinders with oppositely reciprocating pistons acting on same main shaft
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
  • F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00
  • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft
  • F01B9/06—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts, not specific to groups F01B1/00 - F01B7/00 with rotary main shaft other than crankshaft the piston motion being transmitted by curved surfaces

Definitions

• AXIAL SHAFT PISTON ENGINE This invention relates to a mechanism which may be used as an internal combusion piston engine or positive displacement piston pump or compressor -in which the output shaft is co-axial with the pistons and in which the reciprocating movement of the pistons is transformed into rotational movement of the shaft (and vice versa) by means of one or more cylinder cams mounted on the shaft and acting with rollers attached to the pistons.
• the objects of this invention are to reduce physical size for a given capacity, simplify the manufacture of the major structural parts, reduce the number of parts, simplify the balancing of reciprocating masses, and increase mechanical efficiency.
• the objects of this invention are achieved by arranging the pistons and shaft co-axially, with the shaft running through the centre of the pistons.
• the pistons and cylinders are arranged such that the pistons move inwards and outwards in their cylinders concurrently under the effects of the gas pressures in the combustion chambers and act, via rollers mounted in a yoke attached to extensions of the pistons, on the cylinder cam which is mounted on, and forms part of, the axial output shaft. This in turn produces torque in the shaft.
• FIGURES 1A, IB & 1 C show the mechanism as an internal combustion engine (see also schematic diagrams FIG 2 & 3).
• a shaft (9) runs axially through the centres of the end caps and the pistons and carries a specially shaped cylinder cam (10) at its centre.
• the cam (10) is straddled by double rollers (11)(12) & (1-0(13) (FIG IB) which are mounted in yokes (2 ) & (25) attached to an extension of each piston (1) & (2), thus causing the pistons to reciprocate longtitudinally as the shaft (9) and cam (10) rotate.
• FIGURES 2 & 3 are schematic representations of the mechanism.
• the fuel air mixture enters, via a carburettor and valve (16) FIG 2, into the 50 space (15) formed by the pistons around the cam as the pistons move outward. Movement of the pistons inward due to the further rotation of the cam results in the valve (16) closing and the fuel air mixtures starts to compress in space (15).
• the induction port (17) is uncovered by the pistons and the pressurised charge transfers from the space (15), via the transfer ports (18) into the combustion chambers (7) _c (8).
• the spark plug (20) ignites the fuel thus causing a gO pressure build up in the combustion chambers (7) & (8) and the pistons to be forced inwards. This imparts a force to the cam (10) via the rollers (11) & (13) and causes the cam to rotate and impart torgue to the shaft (9).
• Torque reaction on the pistons (1) & (2) is opposed by flat linear roller bearings (27) acting between the piston yokes (24) & (25) FIGURE ⁇ forming part of the piston extension, and the centre section engine casing, (26) FIG 4.
• FIG 6. shows a four lobe cylinder cam which will give two inward and two outward strokes of the pistons (1) & (2) per revolution when mounted on th shaft (9) in place of the two lobe cam - FIG 5. This will provide two power
• FIGURE 7 depicts one end i.e. one pumping chamber for simplicity.
• the shaft (9) When the shaft (9) is turned by external means, the cylinder cam (10) rotates and causes the psitons (1) & (2), by means of the rollers (12) & (14), to move inwards and draw fluid (gaseous or liquid) through the valve (21) into the annular space (7). Further rotation of the shaft (9) causes the pistons (1) & (2) 90 by means of the rollers (11) & (13) to move inwards and force the fluid from the space (7) out of the valve (22).
• a further application of this configuration would have one chamber used as an internal combustion power producing piston engine (as in FIG 3) and the other chamber used as a pump.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=25608776

Family Applications (1)

Country Status (2)

Families Citing this family (3)

Family Cites Families (12)

• 1986
  • 1986-01-31 WO PCT/AU1986/000031 patent/WO1986004637A1/en unknown
  • 1986-01-31 EP EP19860901296 patent/EP0210262A1/de not_active Withdrawn

Non-Patent Citations (1)

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