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An axial motor (100) driven by opposed pistons/cylinder (101a-105b, 111a-115b) pairs arranged in a circular array about a central axis of the motor (100). The opposed pistons (101 a, 101b; 102a, 102b; 103a, 103b; 104a, 104 b; 105a, 105b) in each pair are linked by a corresponding connecting rod (106

An axial motor (100) driven by opposed pistons/cylinder (101a-105b, 111a-115b) pairs arranged in a circular array about a central axis of the motor (100). The opposed pistons (101 a, 101b; 102a, 102b; 103a, 103b; 104a, 104 b; 105a, 105b) in each pair are linked by a corresponding connecting rod (106-110), which transfers the thrust from the pistons (101a-105a) to an output shaft via a power transmission apparatus (300) and z crank (114) arrangement. Reciprocating couplings disposed in the transmission apparatus (300) connect the connecting rods (106-110) to the apparatus (300). During operation, the reciprocating couplings oscillate to retain the connecting rods (106-110) substantially aligned with the corresponding piston pair to reduce side thrust on the pistons.

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The invention claimed is: 1. An axial motor comprising: a plurality of reciprocating thrust means arranged as opposed pairs in a substantially circular array about a central axis; a connecting rod for each thrust means pair connecting the thrust means in that pair, each connecting rod coincident wi

The invention claimed is: 1. An axial motor comprising: a plurality of reciprocating thrust means arranged as opposed pairs in a substantially circular array about a central axis; a connecting rod for each thrust means pair connecting the thrust means in that pair, each connecting rod coincident with an axis extending through the respective thrust means pair it connects; a z crank coupled between the ends of an output shaft extending substantially coincident with the central axis, and comprising a crankshaft; and a power transmission apparatus comprising a z crank coupling coupled to the crankshaft of the z crank, a plurality of coupling support portions which are fixed relative to the z crank coupling, and a plurality of reciprocating coupling sliders, each engaged with a respective coupling support portion, wherein each coupling slider extends outwardly from the respective coupling support portion in a direction substantially transverse to the crankshaft and is reciprocable relative to the coupling support portion by means of a telescopic coupling and is connected to a corresponding connecting rod, wherein each coupling slider is adapted to transfer thrust from a corresponding thrust means pair to the z crank while reducing side thrust on the thrust means pair, by reciprocation relative to the respective coupling support portion in a direction substantially transverse to the crankshaft, with each coupling slider reciprocating relative to the respective coupling support portion by means of a sliding extending and retracting movement to compensate for movement in the transmission apparatus to retain each corresponding connecting rod substantially aligned with the axis extending through the respective thrust means pair it connects. 2. An axial motor according to claim 1 wherein each thrust means is a piston adapted to reciprocate in a respective cylinder in an engine block. 3. An axial motor according to claim 2 wherein the pistons are arranged as in-line opposed pairs. 4. An axial motor according to claim 3 wherein the pistons are constructed from non-metallic composite, and each reciprocates in a corresponding cylinder constructed from a non-metallic composite. 5. An axial motor according to claim 4 wherein the non-metallic composite is a carbon composite, and the cylinders comprise a carbon composite liner disposed in an engine block of the axial motor. 6. An axial motor according to claim 5 wherein seals and bearings are disposed adjacent the connecting rods to isolate the respective pistons and cylinders from lubrication fluid, and at least partially bear residual side thrust on the connecting rods to reduce side thrust on the pistons. 7. An axial motor according to claim 6 wherein the transmission apparatus comprises: a z crank coupling, and a plurality of coupling support arms extending radially from the z crank coupling in which the coupling sliders can oscillate. 8. An axial motor according to claim 7 wherein the reciprocating coupling sliders pump damping and lubricating fluid. 9. An axial motor according to claim 1 wherein each connecting rod is connected to a respective coupling slider by a knuckle joint. 10. An axial motor according to claim 1 further comprising a restraint mechanism to prevent the transmission apparatus spinning around the axis of the z crank. 11. An axial motor according to claim 10 wherein the restraint mechanism comprises an upper annular gear restraint secured to a support structure, and a lower annular gear restraint coupled to the transmission apparatus, and wherein the connecting rods operate within the upper and lower annular gear restraints. 12. An axial motor according to claim 11 wherein the upper and lower gear restraints are constructed from a non-metallic composite material. 13. An axial motor according to claim 12 wherein each connecting rod is connected to a respective coupling slider by a knuckle joint and wherein the upper and lower annular gear restraints engage at a mesh point and the plane on which the knuckle joints reside, intersects at a point with an extension line of the gear restraints' mesh point, rotational axis of the output shaft and longitudinal axis of the z crank. 14. An axial motor according to claim 1 wherein the reciprocating coupling sliders retain the connecting rods in a substantially vertical orientation when the motor is supported in a substantially vertical orientation. 15. A power transmission apparatus adapted for transferring thrust from reciprocating thrust means arranged axially in opposed pairs to a z crank of an axial motor, with each pair of opposed thrust means being connected by a respective connecting rod which extends between the opposed thrust means, the apparatus comprising: a z crank coupling for connecting the transmission apparatus to a crankshaft of a z crank; a plurality of coupling support portions which are fixed relative to the z crank coupling; a plurality of reciprocating coupling sliders, each engaged with a respective coupling support portion, wherein each coupling slider extends outwardly from the respective coupling support portion in a direction substantially transverse to the z crank coupling and is reciprocable relative to the coupling support portion by means of a telescopic coupling and is configured for connection to a respective connecting rod; wherein upon installation of the apparatus in an axial motor, each coupling slider is connected to a respective connecting rod, and during operation of the motor, each coupling slider is adapted to transfer thrust from a corresponding thrust means pair to the z crank while reducing side thrust on the thrust means pair, by reciprocating relative to the respective coupling support portion in a direction substantially transverse to the z crank coupling, with each coupling slider reciprocating relative to the respective coupling support portion by means of a sliding extending and retracting movement to compensate for movement in the apparatus to retain each connecting rod substantially aligned with an axis extending through the respective thrust means pair it connects. 16. An apparatus according to claim 15 wherein the coupling support portions comprise a plurality of coupling support arms extending radially from the z crank coupling and in which the coupling sliders can oscillate. 17. An apparatus according to claim 16 wherein the reciprocating coupling sliders pump damping and lubricating fluid. 18. An apparatus according to claim 15 wherein each coupling slider has a knuckle joint for connection to a respective connecting rod. 19. An apparatus according to claim 15 further comprising a restraint mechanism to prevent the apparatus spinning around the axis of the z crank. 20. An apparatus according to claim 19 wherein the restraint mechanism comprises a lower annular gear restraint and wherein the connecting rods operate within the lower annular gear restraint. 21. An apparatus according to claim 20 wherein the lower gear restraint is constructed from a non-metallic composite material. 22. An axial motor according to claim 7 wherein the coupling sliders are configured to rotate to a limited extent within the respective support arms about respective axes aligned with the reciprocating directions in response to movement of the thrust means. 23. An axial motor according to claim 9 wherein a pivot axle from each connecting rod extends through the respective knuckle joint, with the pivot axle lying substantially transverse to the reciprocating direction of the respective coupling slider. 24. An apparatus according to claim 18 wherein each knuckle joint is configured to receive a pivot axle from a respective connecting rod such that the pivot axle will lie substantially transversely to the reciprocating direction of the respective coupling slider. 25. An apparatus according to claim 16 wherein the coupling sliders are configured to rotate to a limited extent within the respective support arms about respective axes aligned with the reciprocating directions in response to movement of the thrust means. 26. An apparatus according to claim 22 wherein each coupling slider and each coupling support arm comprise wave shaped annular bearing surfaces configured to accommodate the reciprocating motion and rotation of the couplings in the support arms. 27. An apparatus according to claim 25 wherein each coupling slider and each coupling support arm comprise wave shaped annular bearing surfaces configured to accommodate the reciprocating motion and rotation of the couplings in the support arms. 28. An apparatus according to claim 15 wherein a fluid damper is associated with each coupling slider to damp the reciprocating motion of the coupling sliders relative to the respective coupling support portions. 29. An apparatus according to claim 28 wherein each fluid damper comprises a cavity configured for receipt of a damping fluid. 30. An apparatus according to claim 29 wherein each said cavity configured for receipt of a damping fluid is in fluid communication with the z crank coupling, such that damping fluid from a coupled z crank can damp and lubricate the reciprocating movement of the coupling sliders. 31. An apparatus according to claim 29 wherein each coupling slider and a respective coupling support portion form a piston and cylinder arrangement, with each cavity formed within a respective piston and cylinder arrangement. 32. An apparatus according to claim 31 wherein the coupling sliders are arranged to reciprocate within bearing surfaces, and wherein reciprocation of the coupling sliders pumps fluid from said cavities configured for receipt of a fluid to lubricate the bearing surfaces.