A centrifugal clutch, especially in a hand held work apparatus, such as a cut-off machine (1), a brush cutter or the like, having a rotational axis (20), at least one movably mounted centrifugal weight (25) arranged at the drive end and a clutch drum (16) arranged at the output end. The centrifugal
A centrifugal clutch, especially in a hand held work apparatus, such as a cut-off machine (1), a brush cutter or the like, having a rotational axis (20), at least one movably mounted centrifugal weight (25) arranged at the drive end and a clutch drum (16) arranged at the output end. The centrifugal clutch (15) includes a brake device (18) which is released by the centrifugal weight (25) when the centrifugal weight (25) moves radially outward in relation to the rotational axis (20).
대표청구항▼
1. A centrifugal clutch having a drive end and an output end comprising: at least one movably mounted centrifugal weight arranged on said drive end of said centrifugal clutch;a clutch drum arranged on said output end of said centrifugal clutch;said centrifugal clutch defining a rotational axis and b
1. A centrifugal clutch having a drive end and an output end comprising: at least one movably mounted centrifugal weight arranged on said drive end of said centrifugal clutch;a clutch drum arranged on said output end of said centrifugal clutch;said centrifugal clutch defining a rotational axis and being configured to have an engaged state and a disengaged state;a brake device having a released position and an applied position;said brake device including at least one brake element;said centrifugal weight being configured to hold said brake device in said released position when said centrifugal clutch is in said engaged state; and,said brake element being held so as to be radially movable. 2. The centrifugal clutch of claim 1, wherein said centrifugal weight is configured to release said brake device when said centrifugal weight moves outwardly relative to said rotational axis. 3. The centrifugal clutch of claim 1 further comprising: a braking surface;said brake element coating with said braking surface; and,said brake element being configured to lift off said braking surface by said centrifugal weight when said brake device is released. 4. The centrifugal clutch of claim 3, wherein said centrifugal weight is configured to act on said clutch drum via said brake element when said centrifugal clutch is in the engaged state. 5. The centrifugal clutch of claim 3, wherein said brake element is spring mounted radially inward and in a direction toward said braking surface. 6. The centrifugal clutch of claim 3, wherein said brake element has a braking section and a coupling section; said brake section being configured to coact with said braking surface; and, said centrifugal weight being configured to act upon said clutch drum via said coupling section. 7. The centrifugal clutch of claim 6, wherein said centrifugal, weight is configured to press against said brake element when a given rotational speed is exceeded so as to lift said brake element away from said braking surface and, with a further outward movement of said centrifugal weight, said coupling section comps into contact engagement with said clutch drum and said centrifugal weight is connected friction-tight with said clutch drum. 8. The centrifugal clutch of claim 3, wherein said brake device includes a plurality of said brake elements extending over a portion of said braking surface. 9. The centrifugal clutch of claim 8, wherein said brake elements are spring supported by one common spring element. 10. The centrifugal clutch of claim 9, wherein each of said brake elements has an outer periphery; and, said spring element is arranged on said outer periphery of said brake elements. 11. The centrifugal clutch of claim 1, wherein said centrifugal weight is at least partially radially movable relative to said rotational axis; and, said centrifugal weight is spring supported radially inwardly. 12. The centrifugal clutch of claim 1, further comprising a carrier arranged on said drive end of said centrifugal clutch; said carrier having a radially outwardly projecting arm; and, said centrifugal weight being arranged on said arm. 13. The centrifugal clutch of claim 1, comprising a plurality of said centrifugal weights. 14. The centrifugal clutch of claim 13, wherein said plurality of centrifugal weights are arranged in a peripheral direction relative to said rotational axis; and wherein said centrifugal clutch further comprises a plurality of tension springs for resiliently supporting said centrifugal weights; and, each of said tension springs being mounted between two mutually adjacent ones of said centrifugal weights. 15. The centrifugal clutch of claim 1, wherein said centrifugal clutch is mounted in a handheld portable tool including a cutoff machine and brushcutter. 16. The centrifugal clutch of claim 1, wherein said brake element is held on said centrifugal clutch so as to be radially movable. 17. The centrifugal clutch of claim 1, wherein said brake element is radially movably held on said clutch drum of said centrifugal clutch. 18. A centrifugal clutch having a drive end and an output end comprising: at least one movably mounted centrifugal weight arranged on said drive end of said centrifugal clutch;a clutch drum having a rim and being arranged on said output end of said centrifugal clutch;said centrifugal clutch defining a rotational axis and being configured to have an engaged state and a disengaged state;a brake device having a released position and an applied position;said centrifugal weight holding said brake device in said released position thereof when said centrifugal clutch is in said engaged state thereof;said centrifugal weight being at least partially movable in a radial direction with respect to said rotational axis;said brake device including at least one brake element; and,said brake element being mounted in the radial direction between said centrifugal weight and said rim of said clutch drum.
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