Hydraulic hybrid power excavator hydraulic system with switching control function
A hydraulic system and hybrid technology, applied in the hydraulic system field of hydraulic hybrid excavators, can solve the problems of large transformation and high manufacturing cost, achieve the effect of reducing the difficulty and cost of transformation, and continuing the advantages of energy saving
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specific Embodiment approach 1
[0013] Specific implementation mode one: as figure 1 As shown, the switching control hydraulic hybrid excavator hydraulic system described in this embodiment includes an engine 1, a constant pressure variable pump 2, a control oil circuit pump 3, a fuel tank 4, a bucket hydraulic cylinder 5, a first travel Quantitative motor 6, first switching valve group 7, stick hydraulic cylinder 8, second walking quantitative motor 9, second switching valve group 10, overflow valve 11, electric control switching valve 12, hydraulic accumulator 13, rotation variable Pump / motor 14, first hydraulic transformer 15, second hydraulic transformer 16, third hydraulic transformer 17 and boom hydraulic cylinder 18; engine 1 is coaxially mechanically connected with control oil circuit pump 3 through constant pressure variable pump 2 ;
[0014] The oil inlet port of the constant pressure variable pump 2 is connected to the oil tank 4, and the oil outlet port of the constant pressure variable pump 2 i...
specific Embodiment approach 2
[0017] Specific implementation mode two: as figure 1 As shown, in this embodiment, both the first switching valve group 7 and the second switching valve group 10 are composed of four electronically controlled switching valves; An electronically controlled on-off valve is respectively arranged at both ends, and an electronically controlled on-off valve is respectively arranged on the branch oil road with the first traveling quantitative motor 6 and located at both ends of the first traveling quantitative motor 6; An electronically controlled on-off valve is provided on the oil circuit at both ends of the stick hydraulic cylinder 8, and an electronically controlled on-off valve is provided on the branch oil circuit with the second travel quantitative motor 9 and located at both ends of the second travel quantitative motor 9 . Other components and connections are the same as those in the first embodiment.
specific Embodiment approach 3
[0018] Specific implementation mode three: as figure 1 As shown, the rotary variable pump / motor 14 in this embodiment has a rotary variable pump / motor control assembly 14-1. Other compositions and connections are the same as those in Embodiment 1 or 2.
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