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Patent Searching and Data


Title:
HYDRAULIC DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/025546
Kind Code:
A1
Abstract:
A crusher (9) has a switching valve (24) that switches the state of a hydraulic circuit (5) in the crusher (9) so as to: connect a second cylinder (16B) head-side chamber and a housing chamber (S1) when a crushing arm is rotated in the opening direction; connect the housing chamber (S1) and the second cylinder (16B) head-side chamber and disconnect a first cylinder (16A) head-side chamber and the second cylinder (16B) head-side chamber when the pressure inside the first cylinder (16A) head-side chamber is less than a preset set pressure while the crushing arm is rotated in the closing direction; and disconnect the housing chamber (S1) and the second cylinder (16B) head-side chamber, allow hydraulic fluid to flow from the housing chamber (S1) to the discharge side of a control valve (23), and connect the first cylinder (16A) head-side chamber and the second cylinder (16B) head-side chamber when the pressure inside the first cylinder (16A) head-side chamber is greater than or equal to the set pressure while the crushing arm is rotated in the closing direction.

Inventors:
TAKESHITA, Tatsuya
Application Number:
JP2017/023929
Publication Date:
February 08, 2018
Filing Date:
June 29, 2017
Export Citation:
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Assignee:
KOBELCO CONSTRUCTION MACHINERY CO., LTD. (2-1 Itsukaichikou 2-chome, Saeki-ku Hiroshima-sh, Hiroshima 61, 〒7315161, JP)
International Classes:
E04G23/08; B02C1/06; E02F9/22; F15B11/02; F15B11/024; F15B21/14
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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