Rotation-type working machine

Details Rotation-type working machine Rotation-type working machine

2005-04-04

2008-03-18

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Braking

Friction braking

Reexamination Certificate

active

07345441

ABSTRACT:
A parking brake is released by a controller and a rotating electric motor is speed-feedback-controlled or position-feedback-controlled to stop and hold an upper rotating body if at least one of arm operation, bucket operation, and travel operation is carried out in a rotating stopped state and with respect to the arm operation and the bucket operation, cylinder thrust of an arm cylinder or a bucket cylinder is greater or equal to a set value. Thereby, a parking brake and a rotating driving part can be prevented from being damaged by rotating external force generated by excavation reaction force or the like and a rotating body can be stopped and held.

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patent: 2001 011897 (2001-01-01), None
patent: 2003 184808 (2003-07-01), None
patent: 2004 36304 (2004-02-01), None

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