Fixed shaft drive assembly
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Solution Overview
Problem
Existing shaft assemblies in self-stacking industrial/commercial-grade spiral/gyro ovens and freezers face challenges such as short bearing life, corrosion, difficult maintenance, and complex setup due to high temperatures, which lead to frequent disassembly and adjustment issues, and the need for pressurized lubrication systems that can be problematic.
Innovation Solution
A linear fixed shaft drive assembly featuring a non-rotatable shaft with a bearing cup and hub, using permanently lubricated stainless steel bearings and a sprocket to engage with the ball chain assembly, allowing for easy replacement and maintenance with standard tools, and constructed from food-grade materials to withstand high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional steel bearings are used in high temperature environments, then the bearing can support the shaft, but the bearing life becomes short due to wear and corrosion
Solution Approach 1:
The patent changes the material parameter of the bearing from conventional steel to stainless steel, which has different properties including resistance to corrosion and wear at high temperatures. This material parameter change allows the bearing to withstand the harmful effects of high temperature environments while maintaining its support function.
Solution Approach 2:
The patent uses stainless steel, which is a composite material combining chromium and other elements with steel, to create a bearing that resists both wear and corrosion simultaneously. This composite material approach solves the contradiction by providing both mechanical strength and environmental resistance.
2Reliability
If pressurized lubrication system is implemented, then the bearing can be lubricated, but the system becomes complex and maintenance difficult
Solution Approach 1:
The patent applies lubricant directly to the bearing during assembly, allowing the bearing to be self-lubricated without requiring an external pressurized lubrication system. This self-service approach eliminates the complexity of lubrication systems while ensuring proper bearing lubrication.
Solution Approach 2:
The lubrication is performed in advance during the assembly process rather than requiring an ongoing pressurized system. The bearing is pre-lubricated before installation, which eliminates the need for complex lubrication infrastructure during operation.
3Ease of operation
If multiple shims and fasteners are used for shaft assembly, then the shaft can be adjusted and mounted, but the setup becomes difficult and maintenance requires frequent disassembly
Solution Approach 1:
The patent combines multiple adjustment functions into a single integrated shaft assembly design. The shaft, mounting brackets, and alignment features are merged into one unit that can be installed and adjusted as a single component, eliminating the need for multiple separate shims and fasteners.
Solution Approach 2:
The shaft assembly is designed with universal mounting features that provide both adjustment capability and structural support through integrated elements. The mounting brackets incorporate alignment features and adjustment mechanisms in a single component design, reducing the total number of parts needed.
4Ease of repair
If the entire shaft assembly is removed for component replacement, then all components can be serviced, but the maintenance time and complexity increase
Solution Approach 1:
The shaft assembly is segmented into modular components including the shaft, mounting brackets, and bearing assembly. This segmentation allows individual components to be accessed and replaced independently without requiring removal of the entire assembly, reducing maintenance time while maintaining full serviceability.
Solution Approach 2:
The mounting brackets are designed with dynamic fastening features that allow for quick connection and disconnection of components. This enables maintenance personnel to access and replace specific components rapidly without committing to complete assembly removal.
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 extends bearing life, simplifies maintenance by eliminating the need for pressurized lubrication and complex adjustments, and ensures easy installation and servicing, maintaining component alignment and functionality without disturbing the vertical shaft orientation.
Implementation Method 1
The bearing cup comprises at least two permanently lubricated bearings
Data Source
AI summary
A linear fixed shaft drive assembly for use in a self-stacking industrial/commercial-grade spiral/gyro oven or freezer that includes a fixed, non-rotatable shaft having a cylindrical mounting portion, a bearing cup supported by the mounting portion, and a hub and shaft base that includes a shaft portion and flange portion. The flange portion is configured to couple to a first side of a flange extending from the bearing cup. A sprocket is mounted to an opposite second side of the flange extending from the bearing cup. The sprocket includes teeth configured to engage with a ball chain assembly of the oven or freezer. The bearing cup includes at least two permanently lubricated bearings. Rotation of the shaft portion of the hub and shaft base causes the bearing cup and sprocket to rotate on the mounting portion of the fixed, non-rotatable shaft. Also a method for retrofitting an oven or freezer having an existing shaft assembly mounted within a thermal chamber of the oven or freezer, and a method for servicing an oven or freezer having an existing linear fixed shaft drive assembly.