Double-motor circulating ball type steering system of heavy commercial vehicle

Abstract

The invention discloses a double-motor recirculating ball type steering system for a heavy commercial vehicle, which comprises a steering wheel, a steering shaft, a steering angle sensor, an auxiliary motor, an electromagnetic clutch, a worm and gear reducing mechanism, a recirculating ball type steering gear, a torque sensor, a main motor, a planetary gear reducer and a control module, and is characterized in that the steering wheel is assembled at the top end of the steering shaft; the torque sensor is assembled on the steering shaft, the recirculating ball type steering gear input shaft is assembled at the bottom end of the steering shaft, the auxiliary motor is connected with the steering gear input shaft through the worm gear reducer, the steering angle sensor is installed on the steering gear input shaft, and the lower end of a steering screw of the recirculating ball type steering gear is connected with the main motor through the planetary gear reducer. The device has the advantages that a hydraulic pump and an oil tank are omitted, and no complex oil way or oil way accessories need to be assembled; due to the dual-motor design, the fault tolerance of the steering system is improved, and the large-torque output requirement of a heavy commercial vehicle is met; and intelligent driving functions such as electric steering and lane keeping can be realized.

Description

technical field [0001] The invention relates to a dual-motor circulating ball steering system for a heavy-duty commercial vehicle, which belongs to the field of automobile steering gears. Background technique [0002] Currently, recirculating ball hydraulic power steering is mainly used for heavy commercial vehicles. The traditional hydraulic power steering gear has many disadvantages: (1) As the vehicle speed increases, the increase in flow affects the feel. There is a contradiction between high-speed stability and low-speed portability; (2) When the engine is idling, it outputs the rated flow rate. For a constant flow system, the oil pump also works when it is not turning, and the additional fuel consumption is large. [0003] In view of the above shortcomings, the authorized notification number is CN108032902A invention patent discloses an electro-hydraulic power steering device for commercial vehicles and its use method, using the electric steering pump as the hydraulic...

AI Technical Summary

Problems solved by technology

The traditional hydraulic power steering has many disadvantages: (1) As the vehicle speed increases, the increase in flow affects the feel

In order to avoid the premature closing of the valve port of the rotary valve caused by the excessive electric power torque coupled to the steering column when the vehicle is running normally, resulting in the phenomenon that the power steering torque is too large and does not match the steering resistance torque, the electro-hydraulic coupling When the steering system is working normally, the output torque of the motor is small, and only the driver's feel can be adjusted

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