Hydraulic excavator hybrid power system and hydraulic excavator thereof
A technology of hybrid power system and hydraulic excavator, which is applied in the direction of earth mover/shovel, construction, etc., can solve the problems of hydraulic pump/motor vibration and noise, hydraulic oil leakage, etc., and achieve low manufacturing cost, simple control, high power The effect of high density
Inactive Publication Date: 2014-12-10
SANYI ROBOT TECH CO LTD
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Problems solved by technology
[0005] However, the above-mentioned excavator hydraulic hybrid power device is limited by the current manufacturing process level, and there is a common problem of hydraulic oil leakage. In addition, the use of the electro-hydraulic secondary adjustment system as the transmission mode has the problem of vibration and noise in the hydraulic pump / motor
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[0022] In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the following embodiments will specifically illustrate the hydraulic excavator hybrid system and the hydraulic excavator provided by the present invention in conjunction with the accompanying drawings.
[0023] The hydraulic excavator provided in this embodiment includes such as figure 2 The hydraulic excavator hybrid system shown.
[0024] The hydraulic excavator hybrid power system provided in this embodiment includes: a power unit, a composite energy storage unit, and a control unit. The power unit is used to drive the external hydraulic system 30, the composite energy storage unit is connected with the power unit, and the control unit controls the operation of the power unit and the composite energy storage unit.
[0025] The power unit includes: a motor / generator 1 , an engine 2 , and a first rotational speed sensor 15 .
[0026] The motor / gene...
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The invention discloses a hydraulic excavator hybrid power system and an excavator thereof. The excavator comprises the hydraulic excavator hybrid power system. The hydraulic excavator hybrid power system comprises a power unit, a compound energy accumulation unit and a control unit, wherein the power unit comprises a motor / generator connected with an external hydraulic system, and an engine connected with the motor / generator; and the compound energy accumulation unit comprises a current condenser connected to the motor / generator by a first rectification inverter, a second rectification inverter connected with the current condenser, a flywheel connected with the second rectification inverter, a motor connected with the second rectification inverter, and a speed reducing mechanism for connecting the flywheel and the motor to an external revolving platform after being coupled. In the hydraulic excavator hybrid power system provided by the invention, the compound energy accumulation unit adopts a compound energy accumulation mode of the current condenser and the flywheel, so that the power density is high, and the service life is long; and the characteristics of safety, green and environmental protection are achieved.
Description
technical field [0001] The invention relates to engineering machinery, in particular to a hybrid power system of a hydraulic excavator and the hydraulic excavator thereof. Background technique [0002] Statistics show that the energy consumption of the slewing mechanism of hydraulic excavators accounts for about 25% to 40%, and the heat generated by the slewing hydraulic oil circuit accounts for about 30% to 40% of the total heat generated by the hydraulic system. Hydraulic impact and overflow heat will inevitably be generated during slewing braking, which will adversely affect the service life of hydraulic components and the thermal balance of the hydraulic system. If this part of energy is recycled, it will not only protect the system and components, but also save energy. [0003] At present, the energy recovery involved in hydraulic excavators is usually carried out by using a hybrid power system or a hybrid power system. In existing hybrid hydraulic excavators, the engi...
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Inventor 王建明薛运锋杜道佳
Owner SANYI ROBOT TECH CO LTD