HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY

Title:

HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY

Document Type and Number:

Japanese Patent JP3784524

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a rational, effective and highly economical hydraulic circuit for construction machinery with a simple constitutional structure.
SOLUTION: A hydraulic drive type actuator (working machine cylinder 4 and swinging motor 6 or the like) are provided. In this case, an oil cooler circuit 20 is provided separately from a return circuit 7 to an oil tank 2 from an actuator for these working machine cylinder 4 and a swinging motor 6, in this oil cooler circuit 20, a constant discharge pump 21 is arranged, and a constant flow rate oil is always circulated thereby enhancing the heat exchange efficiency in configuration.

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Inventors:

Ishii Shotaro
Koichi Kawamura

Application Number:

JP3288698A

Publication Date:

June 14, 2006

Filing Date:

February 16, 1998

Export Citation:

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Assignee:

KOMATSU LTD.

International Classes:

E02F9/22; F15B21/04; (IPC1-7): E02F9/22; F15B21/04

Domestic Patent References:

JP6147205A
JP1068818U

Attorney, Agent or Firm:

Tsutomu Inoue

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