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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/093070
Kind Code:
Provided is a pivoting work machine that can quickly increase the pivot speed while preventing the pivot parking brake from dragging when pivoting starts. A pivoting work machine comprises: a pivot motor (11); a capacity control device (50, 60); a pivot control device (12, 13) that accepts a pivot command operation and allows hydraulic fluid to be supplied from a hydraulic pump (10) to the pivot motor (11); a pivot parking brake (30); a brake switch device (40); a brake release command unit (70) that inputs a brake release command to the brake switch device (40) so that the pivot parking brake (30) switches to a brake release state after supply of the hydraulic fluid to the pivot motor (11) is permitted; and a capacity limiting unit (46, 69) that limits the capacity of the pivot motor (11) controlled by the capacity control device (50, 60) to be no more than the capacity for releasing the brake up to the time when the brake is released and permits the capacity to be increased after the brake is released.

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KOZUI, Masatoshi
Application Number:
Publication Date:
May 16, 2019
Filing Date:
October 12, 2018
Export Citation:
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KOBELCO CONSTRUCTION MACHINERY CO., LTD. (2-1 Itsukaichikou 2-chome, Saeki-ku Hiroshima-sh, Hiroshima 61, 〒7315161, JP)
International Classes:
E02F9/22; F15B11/02; F15B11/08
Foreign References:
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (Osaka Nakanoshima Building 2nd Floor, 2-2 Nakanoshima 2-chome, Kita-ku, Osaka-sh, Osaka 05, 〒5300005, JP)
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