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Electric hydraulic power-assisted steering system and crane

A technology of hydraulic power steering and electric power assist, which is applied in electric steering mechanism, power steering mechanism, steering mechanism, etc., can solve the problems such as the inability to meet the steering requirements of large axle loads, the deviation of vehicles in high-speed driving, and the large steering resistance torque of tires. , to achieve the effect of improving high-speed steering performance, improving holding ability, and improving deviation

Inactive Publication Date: 2020-12-29
XUZHOU HEAVY MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in the field of construction machinery, pure electric power steering technology still cannot meet the steering requirements of large axle loads. Multi-axle construction machinery vehicles have large axle loads and large tire steering resistance torque, and pure electric power steering systems cannot meet the steering requirements of vehicles. Lightweight operation is required, and the independent hydraulic power steering system is easy to cause the vehicle to run off at a high speed

Method used

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  • Electric hydraulic power-assisted steering system and crane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, an electrohydraulic power steering system includes a steering wheel 3, an electric power assist device 2, and a steering gear 4;

[0034] The electric power booster 2 is located between the steering wheel 3 and the steering gear 4, and can directly and reliably change the boosting characteristics of the steering wheel, and comprehensively control the input torque and rotation angle of the steering gear; the electric power booster 2 includes a motor, a sensor, a speed reduction mechanism, etc. , the sensor may include an angle sensor, a torque sensor, etc. and various combinations thereof; the electric power assist device controls the motor rotation angle through the angle sensor to achieve an automatic back-to-center effect.

[0035]The steering wheel 3 is connected to the steering gear 4 through a steering column or a steering transmission shaft, the oil port at the input end of the steering gear 4 is connected to the oil pump 13 and the hydr...

Embodiment 2

[0045] A crane, including the electro-hydraulic power steering system, uses the combined effect of electric power assist and hydraulic power assist on the crane product to control the mechanical steering action of the vehicle. Through the joint action of electric power assist and hydraulic power assist, it can meet the comprehensive requirements of steering comfort and safety of large-axle-load construction machinery vehicles, realize the power steering function of the steering wheel, improve the driving convenience of the vehicle at low speeds, and reduce the phenomenon of steering wheel fluttering at high speeds.

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Abstract

The invention relates to the field of engineering machinery, in particular to an electric hydraulic power-assisted steering system and a crane. The electric hydraulic power-assisted steering system comprises a steering wheel, an electric power assisting device and a steering gear, wherein the electric power assisting device is positioned between the steering wheel and the steering gear; the electric power assisting device comprises a motor, a sensor and a reduction mechanism; the sensor comprises an angle sensor and a force moment sensor; an oil hole in the input end of the steering gear is connected to an oil pump and a hydraulic oil tank; an oil hole in the output end of the steering gear is connected to a power assisting oil cylinder through a hydraulic pipeline; and the steering gear is connected to a tire through a transmission mechanism. The electric power assisting device is additionally arranged in front of the steering gear with a hydraulic variation ratio; the steering wheelpasses through the electric power assisting device and then reaches the steering gear with the hydraulic variation ratio, so that an electric hydraulic power-assisted steering function of the vehicleis realized, light and reliable low-speed traveling operation and stable high-speed traveling operation of the vehicle can be guaranteed, vehicle travelling safety is guaranteed, and steering returnability of the vehicle is improved.

Description

technical field [0001] The invention belongs to the field of engineering machinery, and in particular relates to an electrohydraulic power steering system and a crane. Background technique [0002] With the increasingly tense international fuel oil situation, the state strongly supports the development of energy-saving and emission-reduction industries. In the field of construction machinery, large-tonnage electric power steering technology is still in a blank state. Due to the axle load of construction machinery vehicles and poor driving conditions, construction machinery vehicles The power steering system still adopts the transmission hydraulic power assist method. The hydraulic power steering system is generally composed of hydraulic pumps, oil pipes, pressure flow control valves, transmission shafts, oil storage tanks and other components. This system must work regardless of whether the car is turning or not. , when the speed of the large steering wheel is low, the hydra...

Claims

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Application Information

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IPC IPC(8): B62D5/06B62D5/04B62D7/20
CPCB62D5/04B62D5/062B62D5/064B62D7/20
Inventor 赵留福曹光光马云旺刘桂昌杨凤玲郝宇张小江
Owner XUZHOU HEAVY MASCH CO LTD
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