Synthetic Resin Thrust Bearing Holder Impact Absorption
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Solution Overview
Problem
Thrust bearings in hydraulic continuously variable transmissions often suffer damage due to eccentric loads, which can cause impacts on the pocket surface, leading to holder damage and reduced lifespan.
Innovation Solution
A thrust bearing design featuring a holder made of synthetic resin with glass fibers, specifically polyamide 66, and a pocket interval of 2 to 5% of the ball diameter, providing enhanced impact absorption and mechanical strength through injection molding and heteromorphic glass fiber reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a holder made of iron is used in a thrust bearing, then the holder has high strength, but it is damaged due to impact from ball delay and advance under eccentric load
Solution Approach 1:
The holder is made from a composite material consisting of synthetic resin and glass fiber (20-40 mass%). This composite structure combines the high strength of glass fiber with the impact absorption capabilities of synthetic resin, creating a holder that resists both static loads and dynamic impacts from ball delay and advance.
Solution Approach 2:
The invention changes the material parameters of the holder from traditional iron to a synthetic resin-based composite. Specifically, the synthetic resin provides viscoelastic properties that allow the holder to absorb impact energy through deformation, while the glass fiber reinforcement maintains sufficient structural strength to support the thrust bearing loads.
2Stability of the object's composition
If the pocket interval is reduced to increase ball support, then the holder structure becomes more rigid, but impact absorption capability decreases
Solution Approach 1:
The invention optimizes the pocket interval parameter to be 2 to 5 times the ball diameter. This specific parameter range provides a balance between maintaining structural stability and allowing sufficient material between pockets to absorb impact forces. The synthetic resin composite material further enables this balance by providing both structural integrity and impact absorption in the same component.
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 synthetic resin holder with glass fibers effectively absorbs impacts, extending the bearing's lifespan and preventing damage, as demonstrated by durability tests showing no damage beyond 20 hours under equivalent load conditions compared to iron holders.
Implementation Method 1
the holder is made of a synthetic resin, preferably, a synthetic resin containing a glass fiber, and has a specific pocket interval amount, it is possible to effectively absorb an impact to the holder due to a delay and an advance of a ball
Data Source
AI summary
According to the present invention, there is provided a thrust bearing that includes a first race ring having a first race surface, a second race ring having a second race surface, a plurality of balls that is placed between the first race surface and the second race surface in a rollable manner, and a holder that holds the balls at equal intervals in a circumferential direction, wherein the holder is made of a synthetic resin, and a pocket interval is 2 to 5% of a diameter of the balls. Damage to the holder is prevented and the thrust bearing has a long life.