Torque limiting arrangement in an i.c. engine

Details Torque limiting arrangement in an i.c. engine Torque limiting arrangement in an i.c. engine

F - Mech Eng,Light,Heat,Weapons

02

P

317/5.35

F02P 5/15 (2006.01) B27B 17/00 (2006.01) F01P 5/06 (2006.01) F01P 7/02 (2006.01) F02B 63/02 (2006.01) F02M 31/07 (2006.01) F02M 35/06 (2006.01) F02M 35/10 (2006.01) F02B 75/02 (2006.01)

Patent

CA 1278025

ABSTRACT In engine-powered machines (motor cutting saw, motor chain saw) with a centrifugal clutch a wearing on the clutch and belt takes place by a high load at an r.p.m. around or above the skidding r.p.m. of the centrifugal clutch. A step for reducing the said wearing can - according to the invention - be taken by limiting the driving torque of the engine In the above-said r.p.m. Interval. The invention means that the cutting machine/ motor saw is provided with electronic equipment counting r.p.m. and then controlling the ignition system so that the torque of the engine is lowered in a predetermined interval . In a cutting machine ignition is allowed in; for example, every third revolution within the interval 3000 - 6000 r.p.m. The working mode can also be widened so that the time difference between several revolutions is detected. It is then possible to indicate when the cutting machine/motor saw is in acceleration and thus refrain from reduction of the torque of the engine in order to make the machine rapidly return to a proper r.p.m. after a reduction thereof.

504811

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