Steering Shaft Drive Layout to Eliminate Backlash Response Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing steering device experiences a deterioration in response due to backlash between the connection shaft and the second shaft, which affects the transmission of rotation force from the electric motor to the second shaft.
Innovation Solution
The electric motor provides a rotation force through a speed reduction device directly to the second shaft, eliminating the need for a connection shaft and thereby reducing backlash, using a press-fit method to secure the worm wheel on the intermediate shaft for efficient force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the connection shaft and the second shaft are connected through the spline portion, then the structure allows relative rotation and movement, but backlash is generated between the connection shaft and the second shaft
Solution Approach 1:
The patent removes the connection shaft from the system, eliminating the spline portion connection that caused backlash. The electric motor is configured to provide rotation force directly to the second shaft, extracting the problematic intermediate connection component while maintaining the necessary functional capabilities.
Solution Approach 2:
The patent merges the functions of the electric motor and the second shaft by establishing a direct connection between them. This eliminates the separate connection shaft and reduces the number of interfaces, thereby eliminating backlash while maintaining adaptability through the integrated design.
2Ease of operation
If the connection shaft is used to connect the electric motor to the second shaft, then the structure provides flexibility in movement, but the response of the rotation force to the second shaft deteriorates
Solution Approach 1:
The connection shaft is extracted from the system, removing the source of backlash that slowed down the response. The electric motor directly drives the second shaft, eliminating the intermediate connection that caused delays in force transmission while maintaining operational flexibility through alternative design arrangements.
3Ease of manufacture
If the spline portion connection is used between the connection shaft and the second shaft, then the assembly is easier to manufacture with standard components, but backlash is generated that affects performance
Solution Approach 1:
The spline portion connection is removed by extracting the connection shaft from the system. This eliminates the need for precision spline manufacturing and assembly, while the direct connection between the electric motor and second shaft can be achieved through simpler mounting methods that do not generate backlash.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the response of the rotation force to the second shaft by eliminating backlash and allows for a more compact design with reduced manufacturing costs and increased durability.
Implementation Method 1
the electric motor is configured to provide a rotation force through a speed reduction device to a second shaft
Implementation Method 2
using a press-fit method to secure the worm wheel on the intermediate shaft for efficient force transmission
Data Source
AI summary
A steering device includes: a steering shaft; a transmitting mechanism configured to transmit the rotation of the steering shaft to a steered wheel; a power cylinder; a rotary valve configured to selectively supply a hydraulic fluid to the pair of the fluid chambers in accordance with the rotation of the steering shaft; and an electric motor configured to provide a rotation force through a speed reduction device to the steering shaft, the steering shaft including a first shaft connected to the steering wheel, and a second shaft connected to the first shaft, and configured to output the rotation force inputted from the first shaft, to the transmitting mechanism side, and the electric motor being connected through the speed reduction device to the second shaft.