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Vehicle steer-by-wire system based on planetary roller screw pair

A planetary roller and steer-by-wire technology, which is applied to steering mechanisms, vehicle components, mechanical steering gears, etc., can solve problems such as complex control pipelines, low steering precision, and difficulty in system integration, achieving high-efficiency, high-precision transmission, The effect of high reliability design and simple control process

Pending Publication Date: 2020-09-22
中国电建集团装备研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the above two sets of hydraulic cylinders are powered by the same system. This steering mechanism is only suitable for manned wheeled vehicles due to low steering accuracy.
Also due to its disadvantages of low transmission efficiency, high energy consumption of hydraulic pump stations, large space occupation, and complex control pipelines, it is not suitable for new energy electric vehicles and automatic driving.
also, figure 1 Another important defect of the front axle steering mechanism is that during the action of the two sets of hydraulic systems, the output of the push (pull) force is synchronous, but the direction of action is inconsistent, which leads to the complexity of the control process of pushing out and pulling in. The integration of the system has brought great difficulties

Method used

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  • Vehicle steer-by-wire system based on planetary roller screw pair
  • Vehicle steer-by-wire system based on planetary roller screw pair
  • Vehicle steer-by-wire system based on planetary roller screw pair

Examples

Experimental program
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Effect test

Embodiment

[0027] Such as figure 2 , 3 As shown, the present invention relates to a vehicle-by-wire steering system based on a planetary roller screw pair. The system includes a first mechanical movable link 1, a propulsion mechanism 2, a main transmission mechanism 3, a guide mechanism 4, and a second mechanical movable link. Connecting rod 5, base 6, front wheel 7, planetary ball screw pair and two independent power transmission devices.

[0028] A base 6 is connected between the two front wheels 7, and two sides of the base 6 are respectively movably connected to the first mechanical movable link 1 and the second mechanical movable link 5.

[0029] The propulsion mechanism 2 includes a tie rod 13 and a planetary ball screw pair. The tie rod 13 is connected with the screw shaft of the planetary ball screw pair for realizing reciprocating translation. Planetary roller screw pair is a mechanical device that converts rotational motion and linear motion into each other. As a new type of linear...

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PUM

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Abstract

The invention relates to a vehicle steer-by-wire system based on a planetary roller screw pair. The system comprises a first mechanical movable connecting rod and a second mechanical movable connecting rod which are movably connected with the two sides of a base respectively, a propelling mechanism respectively connected with the two movable connecting rods, a main transmission mechanism connectedwith the propelling mechanism, and a guide mechanism connected with the main transmission mechanism. The guide mechanism is connected with the base, the main transmission mechanism is connected witha driving system, the propelling mechanism comprises a transverse pull rod and a planetary ball screw pair connected with the transverse pull rod, a planetary nut of the planetary ball screw pair is connected with the main transmission mechanism, and the propelling mechanism, the first mechanical movable connecting rod, the base, the second mechanical movable connecting rod, the main transmissionmechanism and the guide mechanism form a six-rod mechanism. Compared with like systems in the prior art, the system of the invention has the following advantages: the reliability is high, and the controllability, accuracy and comfort of the vehicle steering system are improved.

Description

Technical field [0001] The invention relates to the field of vehicle-by-wire steering, in particular to a vehicle-by-wire steering system based on a planetary roller screw pair. Background technique [0002] With the development of new energy vehicles and autonomous driving technology, vehicle steering systems emphasize more controllability, accuracy and comfort of steering. The steering system of the vehicle has gradually developed from EPS (Electric Power Steering, electric power steering system) to the direction of steer-by-wire. The main difference between steer-by-wire and EPS is that the mechanical connection between the steering wheel and the front wheel is cancelled, and the sensor is used to obtain the steering data of the steering wheel, and then the ECU (Electronic Control Unit, electronic control unit) converts it into a specific Driving force data, using a motor to push the steering gear to turn the front wheels. At the same time, the control unit will feel the cha...

Claims

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Application Information

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IPC IPC(8): B62D5/04B62D3/02
CPCB62D5/0421B62D5/0484B62D5/0442B62D5/0448B62D3/02
Inventor 汪胡根程厚德战晓明
Owner 中国电建集团装备研究院有限公司
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