Wheeled crane and chassis hydraulic control system thereof

Abstract

The invention discloses a chassis hydraulic control system which is used for controlling action of a first chassis actuating element. The system comprises a first directional control valve and an energy accumulator, wherein, the first directional control valve is used for controlling communication between an operating oil port of the first chassis actuating element and a pressure oil passage or areturn oil passage of the system; and an operating oil port of the energy accumulator is communicated with an oil inlet of the first directional control valve. Preferably, the system further comprises a first pressure relay and a second pressure relay which are used for acquiring the pressure of the operating oil port of the energy accumulator, wherein, the pre-determined pressure of the first pressure relay is less than that of the second pressure relay. In the invention, by means of hydraulic control, the operating pressure which meets the need of a differential lock oil cylinder can be output; and owing to small compression ratio of hydraulic oil, the actuating element achieves timely and accurate action response without load influence during the operation process, thus ensuring timelyand effective differential control. On the basis, the invention further provides a wheeled crane with the chassis hydraulic control system.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a wheeled crane and its chassis hydraulic control system. Background technique [0002] The transmission principle of wheeled chassis of construction machinery is roughly the same, the source power is output from the power element, through the clutch to the gearbox, and finally output to the drive axle through the reducer; if the driving form is rear wheel drive, it is output through the transmission shaft to the rear axle for deceleration device. In the case of four-wheel drive, the gearbox in the transmission chain establishes the power connection of the two drive axles through the axle release cylinder. [0003] In the driving state, in order to ensure that the wheels on both sides of the axle run at unequal distances in the form of pure rolling as much as possible, and reduce the friction between the tires and the ground, for each drive axle, it is theoreticall...

AI Technical Summary

Problems solved by technology

In the prior art, the bridge-off driving mode is also an air-controlled type, which also has the above-mentioned defects of the differential lock air-controlled system.

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