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Electric power steering device and torque transmission mechanism thereof

A technology of torque transmission and steering nut, applied in electric steering mechanism, power steering mechanism, steering mechanism, etc., can solve problems such as bending deformation of steering screw rod, and achieve the effect of solving and avoiding deformation of screw rod

Active Publication Date: 2020-12-04
HANGZHOU SHIBAO AUTO STEERING GEAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that the radial force will cause the steering screw to bend and deform, the present invention provides an electric power steering device and its torque transmission mechanism, which makes the housing contact with the steering nut first and provides a reverse direction for the steering nut. Acting force, which offsets the radial force, avoids the influence of the radial force on the screw rod, and solves the problem of screw rod deformation

Method used

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  • Electric power steering device and torque transmission mechanism thereof
  • Electric power steering device and torque transmission mechanism thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] combined with Figure 1-2 , the torque transmission mechanism of this embodiment includes a housing 2 and a screw drive assembly 1 located inside the housing 2, the screw drive assembly 1 includes a screw 11, a steering nut 12, a screw nut 13 and an output shaft 14. The screw nut 13 is looped on the screw rod 11, the steering nut 12 is sleeved on the outer periphery of the screw nut 13, the steering nut 12 is engaged with the output shaft 14, and the housing 21 is connected to the steering nut There is a first gap 15 between 12, and there is a second gap 16 between the steering nut 12 and the screw nut 13. The width of the first gap 15 and the width of the second gap 16 are all in line with the axial direction of the steering nut 12. The direction is vertical, and the width of the first slit 15 is smaller than the width of the second slit 16 . The steering force applied on the steering wheel turns the left and right rotation of the screw 11 into the reciprocating linea...

Embodiment 2

[0028] combined with Figure 1-2 , the torque transmission mechanism of this embodiment, compared with the technical solution of Embodiment 1, can be improved as follows: the width value of the first slit 15 is 0.05-0.2 mm, and the width value of the second slit 16 is 0.4-0.4 mm. 0.6mm.

[0029]When the width of the first slit 15 is less than 0.05mm, the steering nut 12 is likely to abut against the housing 2 due to errors, which affects the movement of the steering nut 12 inside the housing 2. When the width of the first slit 15 is greater than 0.2mm , exceeding the distance that the radial force pushes the steering nut 12 to move in the radial direction, so that the steering nut 12 cannot abut against the housing 2, and the purpose of eliminating the radial force cannot be achieved. When the width of the second gap 16 is When it is less than 0.4mm, the steering nut 12 is likely to abut against the screw nut 13 due to errors under the action of the radial force, resulting in...

Embodiment 3

[0031] combined with Figure 1-2 , the torque transmission mechanism of this embodiment, compared with the technical solution of Embodiment 1 or 2, can be improved as follows: the steering nut 12 includes a first body 121 and is arranged at both ends of the first body 121 and is perpendicular to the first body The limiting plate 122 of 121, the screw nut 13 includes a second body 131 and an end surface 132 arranged at both ends of the second body 131 and perpendicular to the second body 131, the limiting plate 122 and the end surface 132 are provided with The inner sidewall of the limiting plate 122 and the outer sidewall of the end surface 132 abut against each other in the hole for the threaded rod 11 to pass through, and there is a second gap 16 between the first body 121 and the second body 131 . The inner side wall of the limiting plate 122 and the outer side wall of the end surface 132 abut against each other, so that the screw nut 13 is fixed inside the steering nut 12 ...

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Abstract

The invention discloses an electric power steering device and a torque transmission mechanism thereof, and relates to the technical field of power transmission. The electric power steering device comprises a shell and a screw rod transmission assembly arranged in the shell, the screw rod transmission assembly comprises a screw rod, a steering nut, a screw rod nut and an output shaft, and the screwrod nut annularly sleeves the screw rod; the steering nut sleeves a periphery of the screw rod nut, the steering nut is meshed with the output shaft, a first gap is formed between the shell and the steering nut, and a second gap is formed between the steering nut and the screw rod nut; and due to the fact that the first gap is formed between the shell and the steering nut, the second gap is formed between the steering nut and the screw rod nut, and the width of the first gap is smaller than that of the second gap, the steering nut is in contact with the shell firstly, the shell provides a reverse acting force for the steering nut, the acting force is counteracted with a radial force, the screw rod nut is prevented from being affected by the radial force, and then the screw rod is prevented from deforming due to the influence of the radial force.

Description

technical field [0001] The invention relates to the technical field of power transmission, in particular to an electric power steering device and a torque transmission mechanism thereof. Background technique [0002] The recirculating ball electric steering gear is driven by the motor through the deceleration mechanism to drive the steering screw nut to move up and down, which is transformed into the rotation of the output shaft to complete the steering purpose. The screw nut transmission mechanism is one of the most critical components in the recirculating ball electric steering gear. When the output When the shaft outputs torque, the output shaft gives a reaction force to the steering nut, and the steering nut exerts axial force and radial force on the steering screw through force transmission. The axial force can be offset by the bearings at both ends of the steering screw, and the radial force will be The steering screw rod is bent and deformed, which affects driving saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04
CPCB62D5/0445B62D5/0454
Inventor 朱兴旺任培万民伟朱胜峰朱忠明
Owner HANGZHOU SHIBAO AUTO STEERING GEAR