Vehicle Height Adjustment Device Gear Backlash Noise Reduction
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Solution Overview
Problem
Conventional vehicle height adjustment devices generate abnormal noise due to gear backlash and play when adjusting vehicle height, causing collisions between gear teeth.
Innovation Solution
A vehicle height adjustment device incorporating a motion conversion unit with a rotating screw shaft and ball nut, multiple motors, and a transmission unit with a worm wheel and drive gears that mesh oppositely to prevent worm wheel rotation and eliminate play, thereby suppressing noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a gear mechanism is used to transmit motor power to the feed screw mechanism, then the motor power can be transmitted, but gear backlash and play cause teeth collisions that generate abnormal noise
Solution Approach 1:
The gear mechanism is divided into multiple drive gears (at least two) that mesh with the driven gear from different sides. This segmentation allows the system to eliminate backlash by engaging different gear teeth on opposite sides of the driven gear, preventing tooth collisions and abnormal noise while maintaining power transmission capability
Solution Approach 2:
The control method dynamically adjusts the rotation directions of multiple drive gears based on the operation state. During vehicle height adjustment, gears rotate in the drive direction; after stopping, some gears rotate in the opposite direction to eliminate backlash. This dynamic control eliminates the harmful effects of gear play without compromising power transmission
2Ease of operation
If gear teeth collide due to backlash when the spring seat moves closer to or away from the vehicle body, then the mechanism can accommodate movement, but abnormal noise is generated
Solution Approach 1:
The control method applies preliminary anti-action by rotating some drive gears in the opposite direction after the spring seat stops moving. This pre-emptive action eliminates backlash before it can cause tooth collisions during subsequent movement, preventing abnormal noise while maintaining ease of spring seat operation
Solution Approach 2:
Before normal operation resumes, the system performs a preliminary action of rotating drive gears in the opposite direction to take up backlash. This preliminary backlash elimination ensures that when the spring seat moves again, gear teeth engage smoothly without collisions, preventing noise generation
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
The device effectively adjusts vehicle height without abnormal noise by ensuring the worm wheel does not rotate due to meshing drive gears, preventing collisions and play, thus enhancing operational silence.
Implementation Method 1
a motion conversion unit that includes a rotating member and a linear motion member, and that converts a rotational motion of the rotating member into a linear motion of the linear motion member
Implementation Method 2
a transmission unit with a worm wheel and drive gears that mesh oppositely to prevent worm wheel rotation
Data Source
AI summary
A vehicle height adjustment device of the present invention includes a motion conversion unit that includes a rotating member and a linear motion member, and that converts a rotational motion of the rotating member into a linear motion of the linear motion member, a plurality of motors, a driven gear coupled to the rotating member, a plurality of drive gears that meshes with the driven gear, and a spring seat that is coupled to the linear motion member, and that supports one end of a suspension spring interposed between a vehicle body and an axle of a vehicle, wherein after driving the spring seat and then stopping the spring seat, some drive gears of the drive gears are driven in a direction opposite a drive direction of the spring seat.