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

1986-02-18

1987-01-06

Cox, Ronald B.

Internal-combustion engines

Engine speed regulator

Engine speed reduction by partial or complete omission of...

F02D 1110

Patent

active

046338322

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.

REFERENCES:
patent: 3974805 (1976-08-01), Kondo
patent: 4297977 (1981-11-01), Boyama
patent: 4343273 (1982-08-01), Kondo
patent: 4403970 (1983-09-01), Dretzka
patent: 4459951 (1984-07-01), Tobinaga
patent: 4462356 (1984-07-01), Hirt
patent: 4553517 (1985-11-01), Andreasson
patent: 4558673 (1985-12-01), Mackie

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