Sealed Guide Roller Assembly for Hygienic Linear Motor Transport
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Solution Overview
Problem
Long-stator linear motors face challenges in hygienic applications due to the accumulation of dirt and water ingress in the bearing arrangement of guide rollers, which are unsuitable for environments requiring high hygiene and resistance to pressurized cleaning media.
Innovation Solution
A sealed roller design is implemented with a bearing recess on one end face closed by an end wall and a sealing unit covering the open end face, using a rolling bearing arrangement with a shaft seal to prevent contamination and water ingress, allowing easy replacement of the roller assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealed rolling bearings are used in the roller, then protection against water ingress and dirt accumulation is improved, but the design creates depressions and recesses that are undesirable in hygienic applications
Solution Approach 1:
The roller is divided into functionally separate components: the roller body with smooth surface, the bearing arrangement with sealing, and the sealing unit. This segmentation allows the bearing to be protected without compromising the external surface smoothness, as the seal is integrated into the roller structure rather than adding external protrusions.
Solution Approach 2:
The bearing arrangement is nested within the roller body, with the sealing unit positioned between the bearing and the external environment. This nested configuration protects the bearing from water and dirt while maintaining a smooth external surface, as the seal is housed within the roller's internal structure.
2Shape
If unsealed rolling bearings are used in the roller, then the design is simpler and more hygienic, but protection against water ingress and dirt accumulation is insufficient
Solution Approach 1:
The sealing unit acts as an intermediary element between the bearing arrangement and the external environment. It provides the necessary protection against water and dirt while maintaining compatibility with hygienic requirements, as it is designed to be smooth and easy to clean while effectively sealing the bearing.
3Reliability
If the bearing arrangement is protected against contamination, then hygiene requirements are met, but the structure becomes more complex
Solution Approach 1:
The sealing unit is merged with the roller body and bearing arrangement to form an integrated sealed structure. This combination provides contamination protection while avoiding the complexity of separate protective components, as the seal is built into the roller's internal architecture rather than added as an external attachment.
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 design achieves a hygienically suitable roller that minimizes dirt accumulation and protects against splashing water, ensuring smooth operation and easy maintenance.
Implementation Method 1
a bearing arrangement is provided between the first axial end face and the second axial end face, with which the roller is rotatably mounted on the shaft journal
Implementation Method 2
an annular area formed between the centrally arranged shaft journal and the inner circumferential surface of the bearing recess is closed off by a sealing unit
Implementation Method 3
drive magnets (permanent or electromagnets) are arranged on the transport unit, which interact with the magnetic field generated by the drive coils
Implementation Method 4
By selectively controlling the drive coils, in particular by applying a corresponding coil voltage to generate a coil current, a magnetic field moving in the direction of travel along the transport path can be generated
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
In order to design a guide roller or roller unit on a transport unit (5) of a transport device in the form of a long stator linear motor suitable for hygiene applications, it is provided that a first axial end face (12) of a roller (6) of the transport unit (5) is closed by an end wall (15) and the opposite second end face (13) is open, such that a bearing recess (16) is formed in the interior of the roller (6), which is axially limited on one side by the end wall (15), wherein a shaft journal (11) projects through the open second axial end face (13) into the bearing recess (16) and a bearing assembly (14) is arranged in the bearing recess (16) on the shaft journal (11), and in the region of the second end face (13) an annular region forming between the centrally arranged shaft journal (11) and the inner circumferential surface (24) of the bearing recess (16) is closed off by a sealing unit (18).