Mechanical recirculating ball type electric power steering device

Abstract

The invention discloses a mechanical recirculating ball type electric power steering device, which is mainly composed of a direct-current brushless motor, a controller, a sensor, a worm and gear pair,a steering screw nut pair, a rack sector pair and a shell. The steering screw nut pair of a key transmission mechanism adopts an end face circulation mode and is composed of a steering screw, a steering nut, reversers, check rings and a steel ball, and an inner roller path of the steering nut and an outer roller path of the steering screw are combined to form a working roller path of the steel ball. The reversers are embedded in two ends of the steering nut respectively and are axially limited through the check rings. According to the structure, the bearing capacity of the steering screw nutpair is obviously improved, load distribution is even, the structure is stable and firm, the weak link of reversing impact does not exist, the space structure is compact, operation is flexible and smooth, the machining manufacturability is good, and a better use prospect is achieved.

Description

technical field [0001] The invention relates to a steering gear equipped on an automobile, in particular to a mechanical circulating ball type electric power steering device. Background technique [0002] The mechanical circulating ball type electric power steering device is mainly composed of a DC brushless motor, a controller, a sensor, a worm gear pair, a steering screw nut pair, a rack fan pair and a housing. When the steering wheel turns, the torsion signal is transmitted to the input shaft of the steering device through the pipe column and the intermediate transmission shaft. There are sensors in the shaft system, and the relative rotation angle and torque signal between the input shaft and the steering screw are measured by the sensor and transmitted to the controller. Combined with other signals to calculate, output control signal, control the motor to output corresponding torque and speed, torque and speed are transmitted to the rocker arm of the steering gear throu...

AI Technical Summary

Problems solved by technology

Since the present invention is a mechanical circulating ball type electric power steering device with large torque output, the steering screw nut pair transmits a large torque, and the intubation-type bead tongue-shaped part is prone to impact damage, and the commutation radius of curvature of the internal circulation mode is small. It is not suitable for heavy loads. Under heavy loads, the rolling smoothness and flexibility of steel balls will be affected, and it cannot meet the needs of large torque transmission.

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