Fluid pressure circuit, energy recovery device, and fluid pressure recovery circuit for working machine

A fluid pressure and energy regeneration technology, applied in the direction of fluid pressure actuating device, fluid pressure actuating system components, mechanical equipment, etc., can solve the problem of reduced operating speed, inability to set up mutual complementary working fluid support circuits, and inability of boom cylinders to work. Stability and other issues, to achieve the effect of suppressing sudden load fluctuations, realizing stable operation, and suppressing load fluctuations

Inactive Publication Date: 2007-12-19
SHIN CATERPILLAR MITSUBISHI LTD CORP
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  • Abstract
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Problems solved by technology

[0005] The driving device of the above-mentioned work machine is provided with a pump/motor in the closed circuit of the boom cylinder, so when the pump/motor functions as a fluid pressure motor, it starts up rapidly due to the return fluid from the boom cylinder, and due to The disappearance of the return fluid causes a sudden stop, which causes a shock, and the pump/motor becomes a load on the boom cylinder, and the load fluctuates depending on whether the pump/motor is in a stopped state or an operating state, so the operation of the boom cylinder is unstable.
[0006] Also, devices combining the pump/motor and motor/generator described are limited to closed circuits and cannot be adapted for open circuits where return fluid exhausted from a fluid pressure actuat

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  • Fluid pressure circuit, energy recovery device, and fluid pressure recovery circuit for working machine
  • Fluid pressure circuit, energy recovery device, and fluid pressure recovery circuit for working machine
  • Fluid pressure circuit, energy recovery device, and fluid pressure recovery circuit for working machine

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[0036] Hereinafter, referring to the first embodiment shown in FIGS. 1 and 2 and the second embodiment shown in FIG. 3, the third embodiment shown in FIG. 4, the fourth embodiment shown in FIG. 5, and the fourth embodiment shown in FIG. The fifth embodiment of the fifth embodiment, the sixth embodiment shown in FIG. 7 and the modified examples of the hybrid drive device shown in FIG. 8 will specifically describe the present invention.

[0037] First, the first embodiment shown in FIGS. 1 and 2 will be described.

[0038] As shown in Figure 2, the working machine 1 is a hydraulic excavator. The lower running body 2 is provided with an upper rotating body 4 rotatably through a rotating bearing 3, and an engine and fluid pressure are installed on the upper rotating body 4 A power unit 5 such as a pump, a cab 6 that protects an operator, and the like, thereby forming a body 7. The lower running body 2 has running motors 2trL and 2trR for driving the left and right crawlers, respective...

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Abstract

A fluid pressure circuit where energy possessed by return fluid from a fluid pressure actuator can be smoothly absorbed by an energy recovery motor and where stable operation of the fluid pressure actuator can be obtained. A return fluid path (55) to which return fluid discharged from a boom cylinder (8bmc) is branched is provided on the tank path side of a solenoid valve (49) of a boom control circuit (45). In one return path (56) and the other return path (57) of the return path (55) are provided proportional flow control valves (58, 59) for controlling flow ratios branched to the return paths (56, 57). The proportional flow control valves (58, 59) are composed of one solenoid valve (58) for flow control provided in the one return path (56) having the energy recovery motor (26) and of the other solenoid valve (59) for flow control provided in the other return path (57) branched off on the upstream side of the one solenoid valve (58).

Description

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Claims

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Application Information

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Owner SHIN CATERPILLAR MITSUBISHI LTD CORP
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