Note : Les revendications sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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CLAIMS:
(1) A two-stroke supercharged multi-cylinder in-
ternal combustion engine, with inline or V-type configura-
tion and including a pressure lubrication system; compris-
ing in combination a cylinder block having cylinder bores
formed therein, a cylinder head on the upper end of the cy-
lindrical bores and closing same and defining a combustion
chamber at the upper end of each cylindrical bore, a pis-
ton assembly in each of said bores including a piston hav-
ing a domed head and a connecting rod operatively connected
to said piston for reciprocating same between top dead cen-
tre and bottom dead centre, a crankshaft mounted for rota-
tion at the base of said block, said connecting rods being
operatively connected to said crankshaft and an oil pan en-
closing the lower end of the cylinder bores and said crank-
shaft, said cylinder head including a cam shaft mounted for
rotation thereon and being operatively connected to said
crankshaft, at least one inlet-and-scavenger valve mounted
on said cylinder head and being operatively connected with
said combustion chamber of each of said cylindrical bores,
a rocker arm operatively mounted on said cylinder head and
operatively engaging said inlet-and-scavenger valve by one
end thereof, a cam lobe for each rocker arm formed on said
cam shaft operatively connected with the other end of said
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rocker arm, said cam lobes having a relatively wide area of
contact with said rocker arm to control the opening, closing
and duration of opening of said inlet-and-scavenger valve
and exhaust port located in the lower side of the cylinder
walls of the cylinder bores inclining downwardly and out-
wardly through the cylinder walls and being covered and un-
covered by the reciprocating piston passing thereby.
(2) The invention according to Claim 1 in which
said cam lobe opens said inlet-and-scavenger valve at ap-
proximately 110° after top dead centre and closing said in-
let-and-scavenger valve at approximately 70° after bottom
dead centre thereby maintaining said inlet-and-scavenger
valve open through approximately 140°.
(3) The invention according to Claim 1 in which
said piston uncovers said exhaust port approximately 115 °
after top dead centre and closes said exhaust port approx-
imately 65° after bottom dead centre whereby said exhaust
port is opened through approximately 130°
(4) The invention according to Claim 2 in which
said piston uncovers said exhaust port approximately 115°
after top dead centre and closes said exhaust port approx
imately 65° after bottom dead centre whereby said exhaust
port is opened through approximately 130°.
(5) The invention according to Claim 4 whereby
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the overlap between said inlet-and-scavenger valve and said
exhaust port is approximately 10° with the inlet-and-scaven-
ger valve opening approximately 5° before the exhaust port
opens and closes approximately 5° after said exhaust port
closes.
(6) The device according to Claim 1 in which said
piston assembly includes means to control and reduce the es-
cape of lubricating oil therepast, said means including said
piston assembly having a domed piston head crown, a piston
skirt extending therefrom, wrist pin bosses formed in said
skirt below said domed head, sealing caps installed in adja-
cent the outer end of each of said wrist pin bosses, to pre-
vent the escape of oil therepast, a wrist pin mounted in said
wrist pin bosses and operatively connecting said connecting
rod to said piston, at least two compression piston rings
situated in spaced and parallel grooves in the head of said
piston above said wrist pin bosses and at least one oil scra-
per ring mounted within an annular groove around the skirt of
said piston below said wrist pin bosses, drain holes extend-
ing from said groove through said skirt to reduce the escape
of lubricating oil through said exhaust port, said oil scra-
per ring always remaining below the lowermost edge of said
exhaust port when said piston at top dead centre.
(7) The device according to Claim 2 in which said
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piston assembly includes means to control and reduce the es-
cape of lubricating oil therepast, said means including said
piston assembly having a domed piston head crown, a piston
skirt extending therefrom, wrist pin bosses formed in said
skirt below said domed head, sealing caps installed in adja-
cent the outer end of each of said wrist pin bosses, to pre-
vent the escape of oil therepast, a wrist pin mounted in said
wrist pin bosses and operatively connecting said connecting
rod to said piston, at least two compression piston rings
situated in spaced and parallel grooves in the head of said
piston above said wrist pin bosses and at least one oil scra-
per ring mounted within an annular groove around the skirt of
said piston below said wrist pin bosses, drain holes extend-
ing from said groove through said skirt to reduce the escape
of lubricating oil through said exhaust port, said oil scra-
per ring always remaining below the lowermost edge of said
exhaust port when said piston is at top dead centre.
(8) The device according to Claim 3 in which said
piston assembly includes means to control and reduce the es-
cape of lubricating oil therepast,said means including said
piston assembly having a domed piston head crown, a piston
skirt extending therefrom, wrist pin bosses formed in said
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skirt below said domed head, sealing caps installed in adja-
cent the outer end of each of said wrist pin bosses, to pre-
vent the escape of oil therepast, a wrist pin mounted in said
wrist pin bosses and operatively connecting said connecting
rod to said piston, at least two compression piston rings
situated in spaced and parallel grooves in the head of said
piston above said wrist pin bosses and at least one oil scra-
per ring mounted within an annular groove around the skirt of
said piston below said wrist pin bosses, drain holes extend-
ing from said groove through said skirt to reduce the escape
of lubricating oil through said exhaust port, said oil scra-
per ring always remaining below the lowermost edge of said
exhaust port when said piston is at top dead centre.
(9) The device according to Claim 4 in which said
piston assembly includes means to control and reduce the es-
cape of lubricating oil therepast, said means including said
piston assembly having a domed piston head crown, a piston
skirt extending therefrom, wrist pin bosses formed in said
skirt below said domed head, sealing caps installed in adja-
cent the outer end of each of said wrist pin bosses, to pre-
vent the escape of oil therepast, a wrist pin mounted in said
wrist pin bosses and operatively connecting said connecting
rod to said piston, at least two compression piston rings
situated in spaced and parâllel grooves in the head of said
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piston above said wrist pin bosses and at least one oil scra-
per ring mounted within an annular groove around the skirt of
said piston below said wrist pin bosses, drain holes extend-
ing from said groove through said skirk to reduce the escape
of lubricating oil through said exhaust port, said oil scra-
per ring always remaining below the lowermost edge of said
exhaust port when said piston is at top dead centre.
(10) The device according to Claim 5 in which said
piston assembly includes means to control and reduce the es-
cape of lubricating oil therepast, said means including said
piston assembly having a domed piston head crown, a piston
skirt extending therefrom, wrist pin bosses formed in said
skirt below said domed head, sealing caps installed in adja-
cent the outer end of each of said wrist pin bosses, to pre-
vent the escape of oil therepast, a wrist pin mounted in said
wrist pin bosses and operatively connecting said connecting
rod to said piston, at least two compression piston rings
situated in spaced and parallel grooves in: the head of said
piston above said wrist pin bosses and at least one oil scra-
perring mounted within an annular groove around the skirt of
said piston below said wrist pin bosses, drain holes extend-
ing from said groove through said skirt to reduce the escape
of lubricating oil through said exhaust port,said oil scra-
per ring always remaining below the lowermost edge of said
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exhaust port when said piston is at top dead centre.
(11) The invention according to Claim 1 in which
said exhaust port is provided with a rectangular configura-
tion and inclines downwardly and outwardly upon the lower
side of said cylinder wall, said exhaust port being cover-
ed and uncovered by said piston as it moves between top dead
centre and bottom dead centre within said cylindrical bore.
(12) The invention according to Claims 1, 2 or 3
which includes an air blower component operatively connected
to said engine and having an air intake opening and an air
outlet, said air outlet being operatively connected to said
inlet-and-scavenger valve to supply air in sufficient volume
to charge and scavenge said cylinder.
13) The invention according to Claims 1, 2 or 3
which includes a turbo charger and an air blower connected
in series thereto, said air blower being operated by the ex-
haust gases of said engine, said turbo charger and air blow-
er being operatively connected to said inlet-and-scavenger
valves to supply air sufficient to charge and scavenge said
cylinders.
(14) me invention according to Claims 6, 7 or 8
in which said wrist pin is hollow and is bearingly engaged
within said wrist pin bosses, a retainer pin secured to bet-
ween said sealing caps, said retainer pin extending freely
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through said hollow wrist pin, said retainer pin securely
retaining said end caps in position spaced slightly inboard
from the outer ends of said wrist pin bosses.
(15) The invention according to Claims 9 or 10
in which said wrist pin is hollow and is bearingly engaged
within said wrist pin bosses, a retainer pin secured to bet-
ween said sealing caps, said retainer pin extending freely
through said hollow wrist pin, said retainer pin securely
retaining said end caps in position spaced slightly inboard
from the outer ends of said wrist pin bosses.
(16) The invention according to Claim l which in-
cludes a recirculating type pressure lubrication system and
in which lubricating oil is stored in the oil pan and being
supplied to all the vital moving parts by means of the pres-
sure lubricating pump which is driven by the crankshaft by
means of gears, said lubrication system using a micronic oil
filter to ensure that clean oil is supplied at all times to
the critical moving parts.
(17) The invention according to Claim l in which
said cam lobe includes a peripheral contact surface portion
engageable with said inlet-and-scavenger valve and extend-
m g through approximately 140° of rotation thereby control-
ling the opening and closing of said valve and the duration
of the opening and closing thereof in relation to the degree
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of piston travel when the exhaust port is covered and uncover-
ediby said piston, said exhaust port being uncovered for ap-
proximately 130° and covered for approximately 230° of crank
shaft rotation.