Patent US3788289A successfully refreshed from Google Patents.

US3788289A Expired / Lapsed US ⏱️ 0.0 years remaining

Air-cooled internal combustion engine with speed control

Assignee: ZF Friedrichshafen AG

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Filing: 1972-07-07

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Granted: 1974-01-29

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Expires: 1992-07-07

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Abstract

Abstract Air blown over the cooling fins on a cylinder of an internal combustion engine by an engine-driven blower moves a springloaded vane away from a position of abutment against the fins. The vane is linked to a throttle valve in the intake pipe for the fuel mixture and is located on the same side of a reference plane through the cylinder axis which is perpendicular to the axis of the intake pipe, thereby making the connecting linkage short and simple, or even permitting the vane to be mounted on the pivot shaft of the throttle valve. The virtual absence of friction losses in the linkage permits the engine speed to be held closely constant by the vane throttling the fuel supply when the engine speed, and therefore the blower output increases.

Inventors

👤 B Pfister

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-11-05 13:59

CPC Classifications

F; F02; F02D; F02D9/00; F02D9/02; F01; F01P; F01P5/00; F01P5/02; F01P5/06; F02B; F02B75/00; F02B75/16; F02F; F02F1/00; F02F1/02; F02F1/04; F02F1/06; F02F1/065; F02B1/00; F02B1/02; F02B1/04; F02B75/02; F02B2075/022; F02B2075/025; F02D2009/0201; F02D2009/0206; F02D2009/0208; F02D2009/0216

Claims Analysis

Total Claims: 13

Claim 1

Independent Claim 223 words

In an internal combustion engine including a rotary output shaft, a cylinder having an axis, cooling fins on the outer face of said cylinder, a supply conduit for supplying fuel to said cylinder, a terminal portion of said conduit communicating with said cylinder and having an axis perpendicular to a reference plane including the axis of said cylinder, whereby said terminal portion is located on one side of said plane, valve means movable in said conduit for varying the effective flow section of the conduit, blower means drivingly coupled to said output shaft for blowing a stream of air over said fins at a rate corresponding to the rotary speed of said output shaft, sensing means for sensing said rate, said sensing means including a vane member exposed to said stream for movement thereby in response to a change in said rate, and linking means linking said sensing means to said valve means for moving the valve means in response to the movement of said vane member, the improvement which comprises: a. securing means securing said vane member to said cylinder for movement away from a predetermined position relative to selected ones of said fins on said one side of said plane in response to an increase in said rate; and b. yieldably resilient biasing means biasing said vane member toward said position.

Claim 2

Dependent Claim 223 words

Claim 3

Dependent Claim 37 words

In an engine as set forth in claim 1, said selected fins bounding a channel directed toward said vane member, and said blower means including means for blowing said stream through said channel toward said vane member.

Claim 4

Dependent Claim 23 words

In an engine as set forth in claim 2, said vane member, when in said position thereof, being contiguously adjacent said selected fins.

Claim 5

Dependent Claim 29 words

In an engine as set forth in claim 2, said position being located in a quadrant bisected by a plane perpendicular to said reference plane and including said axis.

Claim 6

Dependent Claim 33 words

In an engine as set forth in claim 3, said securing means securing said vane member to said cylinder for pivoting movement about an axis substantial parallel to the axis of said cylinder.

Claim 7

Dependent Claim 50 words

In an engine as set forth in claim 5, said selected fins on said one side having a smaller surface area than corresponding finS on the other side of said reference plane, the fins other than said selected and said corresponding fins being substantially symmetrical relative to said reference plane.

Claim 8

Dependent Claim 27 words

In an engine as set forth in claim 3, said blower means blowing said stream through said channels in a direction substantially parallel to said reference plane.

Claim 9

Dependent Claim 26 words

In an engine as set forth in claim 7, a shroud enveloping said fins and bounding said channels in a direction transverse to said reference plane.

Claim 10

Dependent Claim 33 words

In an engine as set forth in claim 8, a portion of said vane member being located between said shroud and said selected fins when the vane member is in said position thereof.

Claim 11

Dependent Claim 38 words

In an engine as set forth in claim 9, said securing means securing another portion of said vane member outside said shroud to said cylinder, said shroud being formed with an opening for passage of said vane member.

Claim 12

Dependent Claim 26 words

In an engine as set forth in claim 3, said securing means fixedly fastening said vane member to said valve and thereby constituting said linking means.

Claim 13

Dependent Claim 36 words

In an engine as set forth in claim 3, said vane member when in said position thereof substantially conforming to the contour of said selected fins and abuttingly engaging at least one of said selected fins.

References Cited (Backward Citations)

US1660079A Cited

US2548334A Cited

US2525602A Cited

US2836159A Cited

US2935977A Cited

US3104657A Cited

US3161186A Cited

US3326196A Cited

US3650252A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-01-28	1977-07-30	1978-01-29	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-01-28	1981-07-30	1982-01-29	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-01-28	1985-07-30	1986-01-29	$7700.00	Window Closed / Lapsed

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