Automobile Reducer Bush with Incision for Backlash Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automobile reducers face issues with excessive clearance and backlash due to manufacturing errors, wear, and moisture absorption, leading to rattle noise, loss of power, and degraded steering assistance.
Innovation Solution
Incorporation of a damper and bush with an incision, coupled with a clearance compensation mechanism, to elastically support the worm shaft bearing and buffer resisting forces, ensuring accurate steering assist and reducing noise and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional automobile reducer structure is used, then the structure is simple, but excessive clearance and backlash occur due to manufacturing errors, wear, and moisture absorption
Solution Approach 1:
A bush with an incision is introduced as an intermediary component between the worm shaft bearing and the housing. The bush absorbs clearance variations through its elastic deformation capability, preventing excessive clearance and backlash while maintaining a relatively simple overall structure.
Solution Approach 2:
The incision in the bush allows its physical parameters (cross-sectional area, stiffness) to change in response to clearance variations. This parameter change enables the bush to adapt to manufacturing errors, wear, and moisture absorption effects, effectively controlling clearance without complicating the structure.
2Object-affected harmful factors
If worm shaft bearings are fixed rigidly in the housing, then assembly is easy, but rattle noise occurs due to collision when resisting force occurs
Solution Approach 1:
The elastic bush provides beforehand cushioning by absorbing impact forces before they reach the worm shaft bearing and housing. This cushioning effect prevents rattle noise during abrupt rotations or direction changes while maintaining easy assembly through the simple bush insertion structure.
3Measurement precision
If clearance is reduced to eliminate backlash, then steering accuracy improves, but the structure becomes more complex
Solution Approach 1:
The bush acts as a mediator that automatically compensates for clearance variations through elastic deformation. This intermediary component maintains accurate steering by absorbing clearance changes without requiring complex adjustment mechanisms or multiple parts.
Solution Approach 2:
The bush provides self-service clearance compensation through its inherent elastic properties. The incision allows the bush to deform and adapt to clearance variations automatically, eliminating the need for external adjustment mechanisms and keeping the structure simple while improving steering accuracy.
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 solution effectively minimizes clearance and backlash issues, providing accurate steering assistance, reducing noise and power loss, and enhancing driver experience by ensuring precise force transfer between the worm shaft and worm wheel.
Implementation Method 1
a damper coupled to an outer peripheral surface of the bush inside a housing so as to force the bush against the worm shaft bearing and to elastically support between the housing and the worm shaft bearing
Implementation Method 2
a clearance compensation mechanism penetrating the damper and pressurizing the bush towards the worm wheel
Data Source
AI summary
The present disclosure provides an automobile reducer including a worm shaft bearing coupled to an end of a worm shaft meshing with a worm wheel, the end lying opposite a portion of the worm shaft coupled to a motor shaft; a bush coupled to an outer peripheral surface of the worm shaft bearing, the bush having an incision formed by incising one side of the bush; a damper coupled to an outer peripheral surface of the bush inside a housing so as to force the bush against the worm shaft bearing and to elastically support between the housing and the worm shaft bearing; and a clearance compensation mechanism penetrating the damper and pressurizing the bush towards the worm wheel. The automobile reducer can accurately assist the driver's steering wheel manipulation.