Rotary driving system and engineering machine

Abstract

The invention relates to a rotary driving system. The rotary driving system comprises a system oil source, a main motor, an auxiliary motor and a gear shifting valve; the system oil source is connected with a first main working opening and a second main working opening of the main motor; a first auxiliary working opening of the auxiliary motor is communicated with the first main working opening; and a second auxiliary working opening of the auxiliary motor is communicated with a first gear shifting working opening of the gear shifting valve; a second gear shifting working opening of the gear shifting valve is communicated with the second main working opening, and a third gear shifting working opening of the gear shifting valve is communicated with the first auxiliary working opening at the same time; during in a low-speed gear, the first gear shifting working opening is communicated with the second gear shifting working opening, and the second auxiliary working opening is communicated with the second main working opening; during a high-speed gear, the first gear shifting working opening is communicated with the third gear shifting working opening, and the second auxiliary working opening is communicated with the first auxiliary working opening. An oil way is simple and reliable, the cost of the system is reduced, the heating and power loss of the system are reduced, and air suction of the auxiliary motor is avoided. The system can be applied to an open system and a closed system, so that the applicability of the system is improved. The invention further discloses an engineering machine comprising the rotary driving system.

Description

technical field [0001] The invention relates to the field of hydraulic systems, in particular to a rotary drive system. In addition, the present invention also relates to a construction machine comprising the above-mentioned slewing drive system. Background technique [0002] The hydraulic slewing drive system of construction machinery is generally driven by motors. For example, all-terrain cranes and large excavators use dual quantitative motors to drive the slewing in parallel, and the hydraulic slewing system of the boom tower crane uses multiple quantitative motors to drive in parallel. For construction machinery with multiple working conditions, the slewing drive system is required to be able to switch between high torque and high speed. For example, the shovel milling machine requires fast rotation in the shovel loading condition to improve work efficiency, and the milling and digging condition can provide large torque to offset the cutting force of milling and diggin...

AI Technical Summary

Problems solved by technology

However, the above method has a complex structure, requires the participation of various components, has no oil replenishment measures, and increases the pressure loss, resulting in redundant power loss

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