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