Circulating ball type electric power steering gear

Abstract

The invention relates to the technical field of steering equipment for vehicles, and provides a circulating ball type electric power steering gear which comprises a mechanical steering gear, a speed reducer, an integrated motor controller and a sensor. The mechanical steering gear is provided with a steering gear shell and a steering screw, and the speed reducer is provided with a speed reducer shell. The steering gear shell and the speed reducer shell are fixed in a detachable connection mode. A steering input shaft and a worm wheel shaft are arranged in the speed reducer and are flexibly connected through an elastic torsion bar; and a sensor is arranged at the joint of the input end of the steering input shaft and the output end of the worm wheel shaft. The Hela torque sensor capable ofoutputting a torque signal and a corner signal at the same time is adopted, induction is more sensitive, and the signals are more stable and reliable.

Description

technical field [0001] The present invention relates to the technical field of steering equipment for vehicles, in particular to a recirculating ball type electric power steering device. Background technique [0002] At present, the steering gear for vehicles mainly adopts electric power assist type, which is divided into three types: column type, rack and pinion type and recirculating ball type. The electric power steering is directly assisted by the electric motor. The electric power steering system mainly includes a steering wheel torque sensor, a vehicle speed sensor, a controller, a power assist motor, and a reduction mechanism. The basic principle is that the controller receives the steering wheel torque signal, the vehicle speed signal, and the engine signal, and outputs a control signal to control the motor to output the assist torque according to the predetermined assist characteristic. The electric power steering system has many advantages such as energy saving, h...

AI Technical Summary

Problems solved by technology

The electric power steering system has many advantages such as energy saving, high safety performance, and environmental protection. It is one of the development directions of power steering technology in the future. However, there are still many problems in the current electric power steering system: First, most of them are only applied to cars. And all of them are column-type or rack-and-pinion steering gears, which have a narrow scope of application. At present, special vehicles with a front axle of 1.5 tons or more still use hydraulic power steering, which is complicated to install and consumes a lot of energy, especially for pure electric new energy special vehicles. 2. Most of the sensors used in the existing electric power steering are torque sensors that can only output torque signals. The system steering is not light and flexible enough to realize unmanned driving and assisted driving; 3. The structure of the reducer part and the mechanical circulation ball Unreasonable setting of the connection mechanism, resulting in inconvenient assembly and low product assembly qualification

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