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Hydraulic machinery

A working machine and hydraulic technology, which is applied in the direction of mechanical equipment, engine control, machine/engine, etc., can solve problems such as insufficient speed, and achieve the effect of less fuel consumption and excellent operability

Inactive Publication Date: 2014-11-05
CATEPILLAR SARL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the problem of insufficient speed when the hydraulic actuator is operated at high speed in a light load state cannot be solved

Method used

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  • Hydraulic machinery
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Comparison scheme
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Embodiment Construction

[0010] Embodiments of the present invention are described below with reference to the drawings.

[0011] figure 1 A hydraulic pressure control circuit provided to a hydraulic shovel as an example of a hydraulic working machine is shown, where 1 denotes an engine, 2 denotes a variable capacity hydraulic pump driven by the engine 1, 2a denotes a capacity varying device of the hydraulic pump 2, and 3 denotes An oil tank, and A denotes a hydraulic actuator operated using a hydraulic pump 2 as a hydraulic pressure supply source. In this embodiment, the hydraulic shovel includes left and right drive motors, a swing motor, a boom cylinder, an arm cylinder, and a bucket cylinder as hydraulic actuators A. As shown in FIG. In this embodiment, an axial piston pump is used as the hydraulic pump 2 in which the capacity changes according to the inclination angle of the swash plate.

[0012] In addition, 4 denotes a control valve for performing oil supply / discharge control for the correspo...

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Abstract

The invention addresses the problem of avoiding insufficient flow being supplied to the hydraulic actuator and speed becoming insufficient during light loads in hydraulic machinery such as hydraulic shovels when the engine rotation speed is set low during normal work. The solution is to increase the discharge flow of the hydraulic pump (2) by increasing the rotation speed of the engine (1) above the target rotation speed set by the engine rotation speed-setting means (14) when the hydraulic pump (2) discharge pressure is at the light load pump discharge pressure, the hydraulic pump (2) inclination angle is at the maximum inclination angle, and the negative control signal pressure is at the signal pressure when the hydraulic actuator-operating means (7) is at full operation.

Description

technical field [0001] The present invention relates to the technical field of hydraulic working machines such as hydraulic shovels. Background technique [0002] Generally, a hydraulic working machine such as a hydraulic shovel is configured to drive a hydraulic pump by an engine to operate various hydraulic actuators (hydraulic motors and hydraulic cylinders) using the hydraulic pump as a hydraulic pressure supply source, and thus perform tasks such as traveling and digging. various operations. In recent years, improvements in fuel efficiency and exhaust gas reduction of these hydraulic working machines have been progressing. One researched approach to accomplish these goals is to set the engine speed low during normal operation. However, when the engine speed is thus set low, the speed of the hydraulic pump driven by the engine also drops. Therefore, the maximum flow rate that can be supplied from the hydraulic pump to the hydraulic actuator is reduced. As a result, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/00E02F9/22F02D29/04
CPCF02D41/0205E02F9/2285F02D41/021F15B1/083E02F9/2246F02D29/04F15B1/24E02F9/2296
Inventor 畑嘉彦多田彰吾
Owner CATEPILLAR SARL