Electromagnetic friction clutch
AssigneeBaruffaldi Frizioni S.p.A.
InventorPier C. Boffelli
Life of this patent
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Abstract
This invention describes a clutch device with automatic disengagement in case of overloading, useful especially for the rear power take-offs of agricultural tractors, which can be inserted in a conventional clutch casing, replacing the flywheel and the mechnical clutch of the power take-off, in which means exist for commanding the automatic disengagement of the clutch by detecting variations in magnetic flux which occur in the case of slip between the rotor and the armature of the clutch.
Claims15
An electromagnetic friction clutch comprising a driving motor having a sufficient moment of inertia and mass to constitute a flywheel, an armature frictionally engageable with said rotor in driven relationship, electromagnetic control means operable to engage said armature with said rotor and electromagnetic sensor means responsive to changes in reluctance and magnetic flux resulting from slip between said rotor and said armature to disengage said armature from said rotor when said changes exceed a predetermined value.
A friction clutch for drivingly connecting a drive shaft to a main driven shaft and to an auxiliary driven shaft, said clutch comprising:
- (a) a rotor having a moment of inertia and a mass sufficient to act as a flywheel;
- (b) an annular armature coaxially disposed with respect to said rotor and opposed to one face of said rotor to comprise with said rotor an electromagnetic clutch;
- (c) a flanged sleeve coaxially disposed with respect to said armature and splined internally;
- (d) resilient means connecting said armature to said flanged sleeve for axial displacement of said armature into and out of driven engagement with said one face of said rotor;
- (e) electromagnetic control means carried on said rotor and energisable to generate a magnetic flux to displace said armature into driven engagement with said rotor;
- (f) at least one friction disc coaxially disposed with respect to said rotor and axially spaced from said one face thereof with said armature disposed between said one face and said friction disc, said friction disc being in cooperating relationship with said rotor to provide a mechanically operable friction clutch;
- (g) a splined coupling connecting said main driven shaft to said friction disc, said main driven shaft being hollow;
- (h) said auxiliary driven shaft extending through said hollow main driven shaft and being drivenly connected to the internally splined driven member;
- and
- (i) electromagnetic sensor means carried on said rotor and responsive to changes in reluctance and magnetic flux resulting from slip between said rotor and said armature to disengage said armature from said rotor when said changes exceed a predetermined value.
Dependencies are inferred from the claim text.