Worm Shaft Axial Positioning via Magnetic Force in Vehicle Speed Reducer
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Solution Overview
Problem
Conventional vehicular speed reducers experience torque transmission issues due to clearance between the worm shaft and worm wheel, leading to noise, vibration, and discomfort for the driver, as well as potential wear and damage to the teeth of the worm shaft and worm wheel.
Innovation Solution
Incorporation of magnetic members within the gear housing that generate attractive or repulsive forces to axially move the worm shaft, ensuring precise engagement with the worm wheel, thereby eliminating clearance and reducing noise and vibration during motor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If magnetic members are incorporated to eliminate clearance between worm shaft and worm wheel, then noise and vibration are reduced, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical clearance adjustment mechanisms with a magnetic field-based system. Magnetic members generate attractive or repulsive forces to eliminate clearance between the worm shaft and worm wheel, substituting mechanical adjustment with magnetic field control to reduce noise and vibration without requiring complex mechanical adjustment mechanisms
Solution Approach 2:
The patent changes the physical state or properties of the system by introducing magnetic fields. By applying magnetic forces through magnetic members, the clearance parameter between worm shaft and worm wheel is dynamically adjusted and eliminated, transforming the mechanical engagement state to achieve smoother operation and reduced noise
2Reliability
If magnetic members are used to stabilize engagement, then torque transmission is improved, but manufacturing complexity increases
Solution Approach 1:
The patent substitutes complex mechanical engagement adjustment mechanisms with a magnetic field-based system. Magnetic members are integrated into the existing structure to provide stable torque transmission through magnetic forces, simplifying the overall manufacturing process while improving engagement stability
Solution Approach 2:
The magnetic members serve multiple functions: they eliminate clearance, stabilize engagement, and ensure smooth torque transmission. This multi-functionality reduces the need for separate adjustment mechanisms, thereby easing manufacturing while improving reliability
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 solution stabilizes the engagement between the worm wheel and worm shaft, reducing rattling noise, eliminating uncomfortable driver feelings, and ensuring smooth torque transmission by removing clearance and absorbing vibrations.
Implementation Method 1
a gear housing configured to enclose a worm wheel and a worm shaft and including one of a first magnetic member and a second magnetic member, which generate attractive force or repulsive force
Data Source
AI summary
The speed reducer includes: a gear housing to enclose a worm wheel and a worm shaft and including one of a first magnetic member and a second magnetic member, which generate attractive force or repulsive force therebetween as current is applied to a position facing the worm shaft in an axial direction; a first bearing coupled to an end of the worm shaft at an opposite side to a motor shaft-coupling portion; and a moving member coupled, at one side thereof, to an outer race of the first bearing and including, at a remaining side thereof, a remaining one of the first and second magnetic members, so that the moving member is axially moved according to the attractive force or the repulsive force.