Speed-changing device

Speed-changing device

A speed-changing device includes a motor (1), a reduction gear train (2) that reduces a rotation speed of the motor (1) in accordance with a speed reduction ratio and transmits the rotation at the reduced speed, and a speed reduction ratio switching unit (20) that switches the speed reduction ratio....

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: ARIMURA, TADASHI, INAGAKI, KENICHIROU, ATSUMI, MASATOSHI, YAMADA, YUTAKA, KAIZO, HIROYUKI
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDEDFOR
DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOTPARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOTOTHERWISE PROVIDED FOR
HAND TOOLS
MANIPULATORS
PERFORMING OPERATIONS
PORTABLE POWER-DRIVEN TOOLS
TRANSPORTING
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Beschreibung
Zusammenfassung:A speed-changing device includes a motor (1), a reduction gear train (2) that reduces a rotation speed of the motor (1) in accordance with a speed reduction ratio and transmits the rotation at the reduced speed, and a speed reduction ratio switching unit (20) that switches the speed reduction ratio. The speed reduction ratio switching unit (20) includes an actuator (6) that switches the speed reduction ratio, a controller (60) that controls the actuator (6), and a drive state detector (68) that detects an index value representing load torque applied to the motor (1). The controller (60) activates the actuator (6) when the index value exceeds a first threshold value (L1) and activates the actuator (6) when the index value fluctuates between the first threshold (L1) and a second threshold (L2) thereby forming an undulated pattern (L3) that satisfies a predetermined condition.