VSI Crusher Bearing Cartridge Retaining Ring for Bearing Clearance
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Solution Overview
Problem
Conventional bearing cartridges in VSI crushers face issues such as reduced bearing clearance due to over-tightening, seizing of components, difficult maintenance, and installation challenges, leading to operational downtime and performance inefficiencies.
Innovation Solution
A single-piece retaining ring with a thermoplastic polymer material, designed to provide axial and rotational locking without radially compressing the bearing cartridge, facilitating easy installation and maintenance by using a frictional interference fit and avoiding thermal expansion issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-component retaining rings are used to lock the bearing cartridge, then the cartridge is rotationally locked to the frame, but the running clearance of internal bearings is reduced due to radial compression
Solution Approach 1:
The retaining ring material is changed from conventional steel to a polymer material with appropriate mechanical properties. This parameter change allows the ring to provide sufficient locking force while reducing radial compression on the bearing cartridge, thereby maintaining bearing running clearance while ensuring reliable rotational locking.
Solution Approach 2:
The invention uses a polymer material for the retaining ring that combines adequate strength for locking with lower stiffness compared to steel. This composite material approach allows the ring to deform elastically under bolt loading, providing controlled radial force that locks the cartridge without excessively compressing the bearings.
2Force
If conventional steel retaining rings are used, then strong locking force is achieved, but the components seize together making maintenance difficult
Solution Approach 1:
The material parameter is changed from steel to polymer, which fundamentally alters the friction and seizing characteristics. The polymer material provides adequate locking force through friction while preventing galvanic corrosion and seizing that occurs with steel-on-steel contact, thereby enabling easy maintenance and removal.
Solution Approach 2:
The polymer retaining ring acts as an intermediary material between the steel bolts and the aluminum bearing cartridge housing. This intermediate material prevents direct metal-to-metal contact that causes seizing, while still transmitting sufficient locking force to secure the cartridge.
3Strength
If conventional steel retaining rings are used, then adequate strength is achieved, but thermal expansion causes seizing at high operating temperatures
Solution Approach 1:
The material parameter is changed from steel to a polymer with appropriate thermal properties. The polymer material has lower thermal expansion coefficient compared to steel, and does not undergo phase changes at operating temperatures, thereby preventing thermal seizing while maintaining adequate mechanical strength through proper material selection and formulation.
4Reliability
If multi-component retaining rings are used, then rotational locking is achieved, but installation and removal are difficult due to restricted access
Solution Approach 1:
The retaining ring is designed as a single integrated component that combines the functions of multiple separate parts (locking mechanism, friction surface, structural support) into one piece. This merging simplifies the installation and removal process by reducing the number of components that need to be handled in the restricted space, while maintaining reliable rotational locking through the unified design.
Solution Approach 2:
The bearing cartridge mounting system is segmented into distinct functional components: the single-piece retaining ring for locking, the bolts for axial clamping, and the cartridge housing for structural support. This segmentation allows each component to be optimized independently and simplifies maintenance by allowing the retaining ring to be removed and replaced as a single unit.
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 maintains bearing clearance, reduces operational noise and component wear, and simplifies maintenance by preventing radial compression and seizing, while withstanding high temperatures and reducing the overall weight of the crusher.
Implementation Method 1
designed to provide axial and rotational locking without radially compressing the bearing cartridge, facilitating easy installation and maintenance by using a frictional interference fit
Implementation Method 2
avoiding thermal expansion issues
Data Source
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AI summary
A bearing cartridge (10) and a retaining ring (35) for a bearing cartridge to support a rotatable main shaft (15) of a vertical shaft impact (VSI) crusher. The cartridge (10) comprising: an elongate housing (45) defining an internal chamber (32) to receive a part of the main shaft (15) of the crusher; an annular flange (21) projecting radially outward from the housing (45) at or towards a first axial end (24) of the housing (45) to seat within an annular neck (13) of a frame part (11) of the crusher; and a retaining ring (35) releasably mountable to an external facing surface (30) of the housing (45) at or towards a second axial end (35) of the housing (45) to seat within an annular skirt (14) of the frame part (11); wherein the retaining ring (35) is a single piece ring extending radially between the skirt (14) and the housing (45).