US4134370A — Engine with air-cooled non-contact ignition system

Claim 1

Independent Claim 277 words

An air-cooled, V-shaped engine, including: a crankcase having cylinder means mounted on the opposite sides thereof to form a V-shape, said cylinder means being provided with cooling fins, and said crankcase further having a mounting plate on the front end thereof; a crankshaft rotatably mounted in said crankcase, the front end of said crankshaft projecting forwardly from said mounting plate; a flywheel fan mounted on the projecting front end of said crankshaft; a cover secured to said mounting plate and covering said flywheel fan, said cover having air inlet opening means thereon, and two air outlet openings in its rear end, one on each side of said crankcase; enclosure means mounted on each side of said crankcase, each adapted to receive cooling air from one of said air outlet openings and to channel it to flow over the cooling fins of the cylinder means associated therewith; divider means within said cover, arranged to divide said cover into two chambers, one associated with each of said outlet openings, and a compartment having its interior shielded from said flywheel fan by said divider means; and a non-contact ignition system connected and arranged to operate said engine, said system including an ignition plug associated with each of said cylinder means, an ignition coil associated with each of said ignition plugs, generator means incorporated in said flywheel fan, and a non-contact controller unit connected with said generator means and said ignition coils; said generator means, said ignition coils and said non-contact controller unit being housed within said cover, with said ignition coils and said non-contact controller unit being housed within said shielded compartment defined between said divider means and said cover.

Claim 2

Dependent Claim 277 words

An air-cooled, V-shaped engine, including: a crankcase having cylinder means mounted on the opposite sides thereof to form a V-shape, said cylinder means being provided with cooling fins, and said crankcase further having a mounting plate on the front end thereof; a crankshaft rotatably mounted in said crankcase, the front end of said crankshaft projecting forwardly from said mounting plate; a flywheel fan mounted on the projecting front end of said crankshaft; a cover secured to said mounting plate and covering said flywheel fan, said cover having air inlet opening means thereon, and two air outlet openings in its rear end, one on each side of said crankcase; enclosure means mounted on each side of said crankcase, each adapted to receive cooling air from one of said air outlet openings and to channel it to flow over the cooling fins of the cylinder means associated therewith; divider means within said cover, arranged to divide said cover into two chambers, one associated with each of said outlet openings, and a compartment having its interior shielded from said flywheel fan by said divider means; and a non-contact ignition system connected and arranged to operate said engine, said system including an ignition plug associated with each of said cylinder means, an ignition coil associated with each of said ignition plugs, generator means incorporated in said flywheel fan, and a non-contact controller unit connected with said generator means and said ignition coils; said generator means, said ignition coils and said non-contact controller unit being housed within said cover, with said ignition coils and said non-contact controller unit being housed within said shielded compartment defined between said divider means and said cover.

Claim 3

Dependent Claim 74 words

An air-cooled, V-shaped engine as recited in claim 1, wherein said generator means includes a generator coil attached to said mounting plate and received within said flywheel fan, said flywheel fan including a cylindrical rim carrying a magnetic steel generating plate arranged to revolve about said generator coil, and said generator means, said non-contact controller unit, and said ignition coils being connected to one another with leads and without the use of separable connectors.

Claim 4

Dependent Claim 37 words

An air-cooled, V-shaped engine as recited in claim 1, wherein said divider means is arranged to divide the interior of said cover into two chambers having approximately the same arc length of exposure to said flywheel fan.

Claim 5

Dependent Claim 52 words

An air-cooled, V-shaped engine as recited in claim 3, wherein the front face of said cover has curved portions at its upper, outer corners that serve to help guide cooling air through said outlet openings, and a generally vertical wall portion above said divider means forming the front wall of said compartment.

Claim 6

Dependent Claim 30 words

An air-cooled, V-shaped engine as recited in claim 1, wherein said air inlet opening means comprises a central opening in the front of said cover, fitted with anti-dust filtering means.

Claim 7

Dependent Claim 53 words

An air-cooled, V-shaped engine as recited in claim 1, including additionally a gap formed between said enclosure means and the cooling fins of their associated cylinders, arranged to allow the cooling air to blow away foreign matter injested by said flywheel fan and entrained in the cooling air directed at said cooling fins.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1982-01-15	1982-07-17	1983-01-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1986-01-15	1986-07-17	1987-01-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1990-01-15	1990-07-17	1991-01-16	$7700.00	Window Closed / Lapsed

Engine with air-cooled non-contact ignition system

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