Patent Number: 6,170,262

Title: Control device for hydraulically driven equipment

Abstract: The invention relates to a device whereby irrespective of the magnitude of the load the desired maximum flow QM is fed to the hydraulic actuator which drives the working part, thus allowing the working part to work at the desired speed. The flow rate through the flow rate control valves is controlled so that when the operation means is operated beyond a prescribed operating start position, the hydraulic actuators begin to be driven, the flow fed to the hydraulic actuators attaining a prescribed maximum when the operation means is operated to its maximum operating rate, while the rate of change of the flow fed to the hydraulic actuators reaches a prescribed magnitude for each fixed operating rate of the operation means. The rate of change of the flow rate is altered according to the magnitude of the load.

Inventors: Yoshimura; Hiroshi (Hirakata, JP), Nishimura; Kiwa (Hirakata, JP), Kawamura; Koichi (Hirakata, JP)

Assignee: Komatsu Ltd.

International Classification: E02F 9/22 (20060101); F15B 11/00 (20060101); F04B 49/08 (20060101); F15B 11/16 (20060101); F15B 21/08 (20060101); F15B 21/00 (20060101); F16D 031/02 ()

Expiration Date: 01/09/2018