Bearing Support Assembly with Plastic Ring for Shaft Protection
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Solution Overview
Problem
High-speed rotor-bearing assemblies in agricultural machinery are prone to failure, leading to potential damage to the shaft and associated components due to excessive heat buildup and radial displacement, resulting in costly downtime and maintenance during critical harvest periods.
Innovation Solution
A bearing support assembly featuring a ring member secured to the bearing block, which engages with a disc member upon bearing failure to maintain shaft rotation, utilizing a plastic ring member for reduced friction and enhanced labyrinth sealing, thereby preventing radial displacement and extending the life of the bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bearing is used to support high-speed rotation, then rotational movement is enabled, but bearing failure occurs after a period of time leading to shaft damage
Solution Approach 1:
A ring member is provided in advance within the bearing block, positioned to engage with the disc member if the bearing fails. This pre-positioned protective element acts as a cushioning mechanism that will activate only when needed, preventing direct contact between the failed bearing and shaft, thus protecting the shaft from damage while maintaining bearing reliability during normal operation.
Solution Approach 2:
The ring member serves as an intermediary element between the bearing and the shaft. When the bearing fails, the ring member intervenes to prevent direct interaction between the failed bearing components and the shaft, thereby mediating the failure process and protecting the critical shaft from damage while allowing the bearing to be replaced.
2Strength
If the ring member is made of metal to provide structural strength, then engagement strength is improved, but friction and heat buildup increase
Solution Approach 1:
The ring member is made of plastic material instead of metal, utilizing composite material properties that provide sufficient engagement strength while simultaneously reducing friction and heat generation. The plastic material maintains adequate mechanical strength for engaging the disc member during bearing failure while its inherent low-friction characteristics prevent excessive heat buildup during operation.
3Strength
If a large gap is provided in the labyrinth seal to prevent contact, then wear is reduced, but sealing effectiveness decreases
Solution Approach 1:
The ring member is made of plastic material instead of metal, utilizing composite material properties that provide sufficient engagement strength while simultaneously reducing friction and heat generation. The plastic material maintains adequate mechanical strength for engaging the disc member during bearing failure while its inherent low-friction characteristics prevent excessive heat buildup during operation.
Solution Approach 2:
The material parameter of the ring member is changed from metal to plastic, which fundamentally alters the friction characteristics and thermal properties. This parameter change allows the system to maintain adequate engagement strength while reducing friction-induced wear and heat generation, thereby resolving the contradiction between wear resistance and thermal management.
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 effectively limits damage to the shaft and extends the operational life of the machine by maintaining radial position and sealing the bearing, reducing maintenance costs and downtime, particularly in dusty agricultural environments.
Implementation Method 1
The use of metal dictates that the respective parts must not touch each other during operation. Any contact between the two parts will create heat, noise and rapid wear. By using a plastic material for one of the parts, i.e. the ring member, these problems are avoided.
Implementation Method 2
Advantageously, the invention may deliver a labyrinth seal which serves to prevent the escape of lubricating oil or grease and also to prevent the ingress of dirt from the environment into the supported bearing.
Data Source
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AI summary
A bearing support assembly (10) comprising a bearing (12) supported within a bearing block (14) is provided. A shaft (26) is arranged to rotate within the bearing (12) and a disc member (34) is carried on the shaft (26) proximate to the bearing block (14). A ring member (20) is secured to the bearing block (14) so that in the event of bearing failure the disc member (34) engages with the ring member (20) so as to support the shaft (26) in rotational motion. The disc member has a diameter that is larger than the outer diameter of the ring member. The ring member (20) is at least partially recessed into the thickness of the disc member (34). The assembly may be utilised in agricultural machinery which include rotors (30) which are supported on rotating shafts. The ring member (20) may provide a labyrinth seal which inhibits the ingress of particulate matter into the bearing.