Hydraulic drives for hydraulic working machines
A technology for driving devices and working machines, which is applied in the fields of fluid pressure actuation devices, transmission device control, mechanical equipment, etc., can solve the problems of difficult realization of structural price and complexity, and achieve the effect of widening the scope.
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no. 1 approach
[0044] figure 1 It is a figure which shows the hydraulic drive system of the hydraulic working machine which concerns on 1st Embodiment of this invention.
[0045] The hydraulic driving device has: a diesel engine 1 as a prime mover; a variable-capacity hydraulic pump 2 driven by the engine 1; (refer to figure 2 ) the swing motor unit 4 of the hydraulic swing motor 40 driven by rotation; the control valve 5 is built with a plurality of directional control valves including the swing direction control valve 50 for controlling the pressure supplied from the hydraulic pump 2 to the hydraulic swing motor 40 The flow of oil is controlled; the operating lever device 6 for instructing the movement of the rotating body 101; the controller 7; the relief pressure change instruction switch 8; the oil cooler 9;
[0046] The control valve 5 has a valve housing 52 , and the main spool valve 51 a of the rotation direction control valve 50 is disposed in the valve housing 52 . Pressure recei...
no. 2 approach
[0089] Figure 4 It is a figure which shows the hydraulic drive system of the hydraulic working machine which concerns on the 2nd Embodiment of this invention. In the figure, for figure 1 Parts shown that are equivalent are given the same reference numerals.
[0090] Figure 4Among them, the swing motor unit 4A is composed of a swing motor section 4-1 and an additional relief valve section 4-2.
[0091] In the swing motor section 4-1, the hydraulic swing motor 40 is disposed in a casing 41-1, and a pair of actuator oil passages 42a-1, 42b-1 and an internal discharge oil passage 43-1 are formed. In addition, a pair of first rotary relief valves 44a, 44b with a non-shock function and a pair of check valves 45a, 45b for replenishment are arranged.
[0092] In addition, the housing 41-1 has: a first port surface 63 for opening the ports 61a, 61b of the pair of actuator oil passages 42a-1, 42b-1 and the port 62 on one end side of the internal discharge oil passage 43-1; The se...
no. 3 approach
[0099] Figure 5 It is a figure which shows the hydraulic drive system of the hydraulic working machine which concerns on the 3rd Embodiment of this invention. In the figure, for figure 1 and Figure 4 Parts shown that are equivalent are given the same reference numerals.
[0100] Figure 5 Among them, the swing motor unit 4B is constituted by the swing motor section 4-1B and the additional relief valve section 4-2B, and the additional relief valve section 4-2B is used as a connection between the casing 41-2 and the swing motor section 4-1. The casing 41-1 is composed of an independent relief valve block, and the casing 41-2 is fixed to the first port surface 63 of the casing 41-1 of the rotary motor section 4-1B by bolts and assembled, thereby being assembled with the rotary motor The point that the segment 4-1B is integrated is the same as that of the second embodiment.
[0101] In this embodiment, the port of the internal discharge oil passage 43-1B does not open to th...
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