A hybrid system for excavators
A hybrid power system and hybrid technology, applied to earth movers/shovels, construction, etc., can solve problems such as the impact of boom falling speed, inconvenient installation of accumulators, pressure rise, etc., and achieve significant energy saving effects , Improve energy utilization efficiency and reduce installed power
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Embodiment 1
[0037] Such as figure 2 As shown, a series hybrid system for an excavator includes a prime mover 1, a hydraulic pump / motor 2, a boom hydraulic cylinder 4, a second reversing valve 702, a speed sensor 19, a pressure sensor 17, a flywheel 12 and a controller 15, the prime mover 1 is connected with the hydraulic pump / motor 2 through the transfer case 6, the prime mover 1 is generally an engine such as a diesel engine, and may also be an electric motor. The oil suction port S of the hydraulic pump / motor 2 is connected to the oil tank 5;
[0038] A third clutch 3 is connected in series between the transfer case 6 and the hydraulic pump / motor 2;
[0039] The oil outlet P of the hydraulic pump / motor 2 is respectively connected with the P port of the first reversing valve 701 and the P port of the third reversing valve 703; Port A is respectively connected to the rodless cavity and the rod cavity of the boom hydraulic cylinder 4; the T port of the third reversing valve 703 is conne...
Embodiment 2
[0061] Such as image 3 As shown, a series hybrid system for excavators includes prime mover 1, hydraulic pump / motor 2, boom hydraulic cylinder 4, second reversing valve 702, speed sensor 19, pressure sensor 17 and control Device 15; the prime mover 1 is connected with the hydraulic pump / motor 2 in transmission, and the prime mover 1 is generally an engine such as a diesel engine, and may also be an electric motor. The oil suction port S of the hydraulic pump / motor 2 is connected to the oil tank 5;
[0062] The prime mover 1 is connected to the hydraulic pump / motor 2 through the first clutch 9 . For the clutch, when the power is on, the clutch is engaged; when the power is off, the clutch is disengaged.
[0063] The oil outlet P of the hydraulic pump / motor 2 is respectively connected with the P port of the first reversing valve 701 and the P port of the third reversing valve 703; Port A is respectively connected to the rodless cavity and the rod cavity of the boom hydraulic...
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