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Working machine

a technology of working machine and working shaft, which is applied in the direction of process and machine control, vehicle position/course/altitude control, instruments, etc., can solve the problems that the communication path b>31/b> is always open and cannot meet, so as to prevent sudden deceleration, improve the operability of combined operation, and reduce the speed more sharply

Inactive Publication Date: 2006-11-30
KOBELCO CONSTR MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a working machine with a hydraulic control apparatus that can appropriately control the communication path between the pumps and the working attachment based on the situation. This allows for better control and operability during combined operation of traveling and working. The control valve opens or closes the communication path based on the position of the straight travel valve, the working pressure, and the traveling pressure. This prevents adverse effects such as sudden deceleration and ensures smooth operation of the working machine.

Problems solved by technology

However, the above-described configuration in which the communication path 31 is always open cannot meet the requirements of the following two cases.

Method used

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Embodiment Construction

[0035] The preferred embodiments of the present invention will now be described with reference to the drawings.

[0036] As an example of a working machine to which the present invention is applied, a hydraulic excavator will be described. As shown in FIG. 5, a hydraulic excavator includes a crawler-type lower traveling body 1, an upper rotating body 2 mounted on the lower traveling body 1 and rotatable around a vertical axis, and a working (excavating) attachment 9 attached to the upper rotating body 2. The working (excavating) attachment 9 includes a boom 3, an arm 4, a bucket 5, a cylinder 6 for raising and lowering the boom 3, a cylinder 7 for actuating the arm 4, and a cylinder 8 for actuating the bucket 5.

[0037] The hydraulic excavator further includes left and right traveling motors 10 and 11 that cause the lower traveling body 1 to travel and a rotating motor 12 that causes the upper rotating body 2 to rotate.

[0038]FIG. 1 shows the overall structure of a hydraulic control ap...

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Abstract

A working machine includes a hydraulic control apparatus. In a straight travel valve of the hydraulic control apparatus, a communication path and a control valve that opens and closes the communication path are provided. During a combined operation of traveling operation and working operation, a working pressure and a traveling pressure are taken in as pilot pressures on either side. During a small traveling operation in which the traveling operation amount is small, the communication path is unconditionally closed. During a large traveling operation in which the traveling operation amount is large, if the working pressure is higher than the traveling pressure, the communication path is open, and if the working pressure is lower than the traveling pressure, the communication path is closed.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a working machine such as a hydraulic excavator having a hydraulic control apparatus. [0003] 2. Description of the Related Art [0004]FIG. 6 shows a hydraulic control apparatus of a hydraulic excavator as an example of a working machine. [0005] A straight travel valve 27 is a two-position four-port switching valve having a neutral position x, a straight travel position y, pump ports P1 and P2, and actuator ports A and B, and is switched and controlled by a secondary pressure of an electromagnetic proportional switching control valve 29 based on a command from a controller 28. [0006] Operation signals according to the operation amounts of remote control valves 19 to 24 are input into the controller 28. During a single operation in which traveling operation and working operation (operation of working actuators 6, 7, 8, and 12) are performed separately, the straight travel valve 27 is at...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E02F5/02
CPCE02F9/2242E02F9/2296E02F9/2292E02F9/2253
Inventor TOJI, YUTAKAYAMAZAKI, YOICHIROOKA, HIDEKAZUUEDA, KOJI
Owner KOBELCO CONSTR MASCH CO LTD