Power Steering Worm Reducer Lubrication Recirculation
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Solution Overview
Problem
In motor driven power steering devices, uneven lubrication of internal parts within the reducer leads to increased frictional force, noise, and vibration due to grease aggregation, which is not effectively addressed by existing technologies.
Innovation Solution
A motor driven power steering device with a rotation member featuring blades that recirculates lubrication agent between the worm gear and worm wheel, utilizing a lubrication agent pocket to ensure even distribution and prevent agent inflow into the bearing, thereby reducing friction and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grease is applied to the internal parts of the reducer, then lubrication performance is improved, but grease aggregation occurs around specific parts leading to uneven lubrication
Solution Approach 1:
The patent introduces a rotation member that rotates together with the worm gear to dynamically circulate grease throughout the reducer. This dynamic mechanism ensures grease is continuously moved and distributed to all internal parts including the worm wheel, preventing aggregation and maintaining even lubrication distribution during operation.
Solution Approach 2:
The rotation member utilizes the existing rotational motion of the worm gear to drive grease circulation without requiring an external pump or additional power source. The system self-services by using its own operational movement to distribute lubrication agent, eliminating the need for separate grease distribution mechanisms.
2Reliability
If grease is not evenly applied to the internal parts of the reducer, then lubrication action does not work smoothly, but adding more grease may cause aggregation
Solution Approach 1:
The rotation member creates dynamic grease circulation that actively transports lubrication agent to all contact surfaces. This dynamic distribution ensures smooth lubrication action throughout the reducer without requiring complex static grease distribution systems or multiple grease application points.
3Reliability
If lubrication agent flows along the worm gear, then lubrication is provided, but lubrication agent may inflow to the bearing causing noise
Solution Approach 1:
The patent extracts or removes excess lubrication agent from the bearing area using the rotation member. The rotation member acts to separate the lubrication agent flow, directing it away from the bearing and preventing the harmful effect of grease-induced noise while maintaining necessary lubrication at the worm gear and worm wheel contact surfaces.
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 ensures even lubrication of internal parts, reducing frictional force and noise between the worm gear and worm wheel, while preventing lubrication agent from entering the bearing, thus enhancing the operational smoothness and reducing vibration.
Implementation Method 1
a rotation member mounted between the worm gear and the bearing and circulating the lubrication agent applied between the worm gear and the worm wheel
Implementation Method 2
a lubrication agent such as grease is applied to the internal parts of the reducer to increase the lubrication performance
Implementation Method 3
The rotation member may include a rotation body mounted on the shaft of the worm gear and at least one blade formed on the rotation body
Data Source
AI summary
A motor driven power steering device including a motor and a speed reducer configured to decelerate a rotation speed of the motor, wherein the speed reducer includes a worm gear coupled to a drive shaft of the motor and rotatably installed to a speed reducer housing through a bearing, a worm wheel gear-coupled with the worm gear, and a rotation member mounted between the worm gear and the bearing and configured to circulate a lubrication agent applied between the worm gear and the worm wheel.