Grease Application Nozzle for Worm Wheel Concave Portions
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Solution Overview
Problem
Existing grease application methods and devices struggle to efficiently apply a sufficient amount of grease to the concave-convex parts of gears, particularly the bottom portions, in a short time, often requiring multiple revolutions and failing to uniformly cover these areas.
Innovation Solution
A grease application device with a nozzle that applies grease as a liquid or gel phase, featuring an inclined tip to push grease into concave portions, and a detection system to adjust the grease amount based on the rotation position, ensuring application is completed in one revolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If grease is applied in spray state to tooth part, then grease can be applied to surface, but it is difficult to apply sufficient amount to concave portions and requires multiple revolutions
Solution Approach 1:
The invention changes the physical state parameter of grease from spray (aerosol) to liquid/gel phase, allowing the grease to flow into and fill concave portions effectively. This parameter change enables sufficient grease application in a single revolution without requiring multiple passes
Solution Approach 2:
Instead of spraying grease toward the tooth surface from a distance, the invention positions the nozzle opening close to the concave-convex part and directs grease flow into the concave portions. This inverted approach of applying grease from the concave side rather than spraying from the convex side enables effective filling
2Manufacturing precision
If grease spray-application gun is used, then grease can be applied uniformly to tooth surface, but insufficient grease reaches tooth bottom portions
Solution Approach 1:
The invention applies different grease delivery methods to different locations: the nozzle opening is positioned close to concave portions to deliver liquid/gel phase grease directly into them, ensuring adequate grease quantity in hard-to-reach areas while maintaining overall uniform coverage
3Quantity of substance
If multiple revolutions are performed for grease application, then sufficient grease amount can be applied, but application time increases
Solution Approach 1:
The liquid/gel phase grease is prepared in advance with appropriate viscosity and flow characteristics that enable it to quickly fill concave portions during a single revolution. The grease formulation and nozzle design are preliminarily optimized to ensure adequate penetration and distribution in one pass
Solution Approach 2:
Changing grease from spray state to liquid/gel phase fundamentally alters its application characteristics, allowing sufficient quantity to be deposited in a single revolution rather than requiring multiple passes, thus reducing application time
Data Source
AI summary
The present invention relates to a grease application device in which a tip-side inclined surface of a nozzle 28 is made to closely face worm wheel teeth 11 of a shaft-mounted worm wheel 9 while rotating the shaft-mounted worm wheel 9 by means of a drive unit 12. At this state, the grease application device is configured to apply liquid grease from a tip-side opening of the nozzle 28 to the worm wheel teeth 11 of the shaft-mounted worm wheel 9 and to apply the grease while pushing the grease into concave portions of the worm wheel teeth 11. Also, the grease application device is configured to end the application of the grease at a point of time at which the shaft-mounted worm wheel has rotated one revolution with respect to the nozzle 28 after starting the application of the grease to the shaft-mounted worm wheel 9.