Expansible chamber devices – Relatively movable working members – Interconnected with common rotatable shaft
Patent
1994-06-15
1996-02-27
Look, Edward K.
Expansible chamber devices
Relatively movable working members
Interconnected with common rotatable shaft
92DIG1, 92DIG2, 123196R, 384288, 384397, F01B 100, F01M 100, F16C 1700
Patent
active
054939526
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to apparatus for converting reciprocating motion to rotary motion and vice-versa comprising a reciprocatory assembly guided for reciprocation in a first direction and comprising first and second reciprocating members each terminating in a planar guide surface transverse to the direction of reciprocation, and spacing tie means interconnecting the two reciprocatory members at opposite ends of the guide surfaces to maintain the guide surfaces parallel, spaced apart and facing each other, a drive block having opposed guide faces each slidably engaged with a respective one of the guide surfaces of the reciprocatory members, a rotary member mounted for rotation about an axis transverse to the said direction of reciprocation and having an eccentric portion rotatably engaged in a plain bearing in the drive block and a lubrication system for supplying lubricant under pressure through the rotary member to a plurality of outlet ports in the surface of the eccentric portion, the drive block having a passage leading to the respective guide surfaces from respective ports in the plain bearing positioned to communicate with the outlet ports of the eccentric portion as the latter rotates in its bearing.
BACKGROUND OF THE INVENTION
Such apparatus as described above is particularly suitable for interconnecting a pair of opposed pistons with a crankshaft throw in positive fluid displacement machines such as pumps and internal combustion engines as proposed for example in EP-A 0,241,243.
A problem in such known apparatus is to ensure adequate lubrication the planar guide surfaces under the high loads imposed on them particularly at high speeds.
Apparatus according to the invention is characterised in that the bearing port or ports connected with a guide surface lie within a quadrant of the plain bearing, the two quadrants being on opposite sides of the axis of the bearing, and the outlet ports in the eccentric portion all lie in a sector thereof smaller than the angular extent of the unported portion of the bearing separating ports connected to different guide surfaces of the drive block.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:
FIG. 1 shows schematically and mainly in section an internal combustion engine according to the invention as seen from the end adjacent the timing gears and chains;
FIG. 2 is a plan view, mainly in section on the line II--II of FIG. 1;
FIG. 3 is a sectional view on the line III--III of FIG. 2, on an enlarged scale;
FIGS. 4a to 4h each show the crankpin bearing portion of FIG. 3 on an enlarged scale in eight successive positions during half a revolution of the crankshaft; and
FIG. 5 is a plan view of a modified drive block bearing plate.
DETAILED DESCRIPTION
FIGS. 1 and 2 show diagrammatically the-principal components of an eight-cylinder horizontally-opposed internal combustion engine having two banks of four cylinders each. The cylinders C1, C3, C5 and C7 are arranged in line in one bank A while the other cylinders C2, C4, C6 and C8 are arranged in line in the other bank B. Each cylinder is formed by a cylinder liner 11 mounted in an engine block 12, the lower end of which is closed in the normal manner by an oil sump 13.
Each pair of opposed cylinders, such as C1 and C2, are coaxial. A rotary member or crankshaft 14 is rotatably mounted in five main bearings 15 in the engine block 12 end has four eccentric portions, i.e. crankpins 16, one for each opposed pair of cylinders. Measured in the direction of rotation of the crankshaft 14, the angular spacings of the crankpins 16 are, from the front of the engine (i.e. the left hand side in FIG. 2) 0.degree., 180.degree., 270.degree. and 90.degree.. Thus, the firing order for the engine in four stroke form is 1-6-3-8-4-7-2-5.1.
Each cylinder contains a piston 17. The two pistons 17 of a pair of opposed cylinders such as C1 and C2 are connected together by a reciprocatory connect
REFERENCES:
patent: 2217912 (1940-10-01), Lindsey
patent: 3017229 (1962-01-01), Dilworth
patent: 3929394 (1975-12-01), Hackett et al.
patent: 4013048 (1977-03-01), Reitz
patent: 4345797 (1982-08-01), Ballheimer
patent: 5072699 (1991-12-01), Pien
patent: 5138991 (1992-08-01), Wojdyla
Daniel Michael R. L.
Fountain Graham H.
Collins Motor Corporation Ltd.
Look Edward K.
Nguyen Hoang
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