Axial Groove Bolt Reservoir for Planetary Gear Lubrication
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Solution Overview
Problem
Epicyclic gear trains face increased wear and reduced service life due to insufficient lubrication, particularly in grease-lubricated planetary gears, leading to premature degradation of the toothed gear.
Innovation Solution
Incorporating an axial longitudinal groove on the bolt surface as a grease reservoir, connected to the tooth base of the planet gear via a radial bore, ensures consistent lubrication distribution across the sliding joint, preventing insufficient lubrication and enhancing the service life by 2 to 3 times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If grease lubrication is used in planetary gears, then the service life of the gear transmission is extended, but wear on the bolts increases due to insufficient lubrication at the sliding joint
Solution Approach 1:
The invention pre-fills the longitudinal groove on the bolt with lubricating grease before assembly. This preliminary action ensures that lubrication is immediately available at the sliding joint when the planet wheel rotates, preventing wear and extending service life without requiring additional lubrication mechanisms during operation.
Solution Approach 2:
The longitudinal groove acts as an intermediary structure between the grease reservoir and the sliding joint. It transports and distributes the lubricating grease from the radial bore through the tooth base to the sliding interface, ensuring continuous lubrication at the critical wear zone.
2Reliability
If a radial bore is added to connect the engagement space with the bearing, then lubrication is improved, but the structural complexity of the planet gear increases
Solution Approach 1:
The invention combines the radial bore and the longitudinal groove into an integrated lubrication pathway. The radial bore in the tooth base connects directly to the longitudinal groove on the bolt, creating a continuous channel that delivers grease from the engagement space to the sliding joint without requiring separate reservoirs or complex distribution systems.
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 axial longitudinal groove acts as a lubricant reservoir, ensuring continuous lubrication to the sliding joint, significantly increasing the service life of the epicyclic gear train by maintaining optimal lubrication levels during operation.
Implementation Method 1
the lubricating grease is conveyed from this longitudinal groove into the sliding joint between the lateral surface of the bolt and the inner surface and is evenly distributed there by the rotation of the planet wheel, thereby reducing the risk of insufficient lubrication
Data Source
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AI summary
The invention relates to a rotary gear drive with at least two meshing gears forming a meshing area, one of which is a rotating gear rotatably mounted on a bolt by means of a bearing, and a cylindrical surface of the bolt forms a bearing surface. According to the invention, at least one axial longitudinal groove is arranged on the cylindrical surface of the bolt.