Plummer Block Housing Structure for Liquid Ingress Prevention
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Solution Overview
Problem
The existing plummer block design allows liquid to enter the inside, leading to corrosion due to the overlapping surfaces of the upper and lower housing portions, which is not effectively prevented by existing solutions.
Innovation Solution
The design includes an upper and lower housing portion with a first and second surface, where the first surface has a contact region and a protruding region that extends outward in the radial direction, creating a gap that reduces liquid ingress, and a recessed surface configuration to enhance sealing and assembly, with specific geometric relationships between the surfaces to minimize corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the entire lower surface of the upper plummer block is disposed to overlap with the upper surface of the lower plummer block, then the assembly is simple and compact, but liquid such as rainwater may pass through between the surfaces and enter the inside of the plummer block causing corrosion
Solution Approach 1:
The invention transitions from a two-dimensional overlapping surface configuration to a three-dimensional configuration by adding a protruding portion that extends in the radial direction. This dimensional change creates an eaves-like structure that prevents liquid from reaching the contact region between the upper and lower housing portions, thereby solving the liquid ingress problem while maintaining assembly simplicity.
Solution Approach 2:
The protruding portion acts as a preliminary protective structure that prevents liquid from reaching the contact region between housing portions. By creating this protective barrier in advance, the invention prevents corrosion before it can occur, rather than attempting to address corrosion after liquid has entered the assembly.
2Object-affected harmful factors
If a protruding portion is added to prevent liquid ingress, then corrosion resistance is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The lower surface of the upper housing portion is segmented into distinct functional regions: a contact region for mating with the upper surface of the lower housing portion, and a protruding portion that extends radially outward. This segmentation allows each region to perform its specific function independently while maintaining overall structural simplicity.
Solution Approach 2:
The protruding portion serves multiple functions: it acts as an eaves to prevent liquid ingress, provides a reference surface for assembly alignment, and maintains the compact overall structure. By combining multiple functions into a single structural feature, the invention avoids increasing device complexity while achieving corrosion protection.
3Object-affected harmful factors
If the maximum width R1 of the first surface in the radial direction is greater than the width R2 of the second surface, then liquid ingress is prevented, but the handleability and compact size are compromised
Solution Approach 1:
The invention carefully controls the radial width difference between the first and second surfaces by specifying that R1-R2 should be 2% or more and 15% or less of R1. This parameter optimization ensures sufficient liquid ingress prevention while maintaining acceptable handleability and compact dimensions. The specific percentage range balances protective function with operational requirements.
Data Source
AI summary
A plummer block includes a bearing and a bearing housing that accommodates and supports the bearing. The bearing housing includes an upper housing portion and a lower housing portion that is separate from the upper housing portion. The upper housing portion has a first surface facing downward. The lower housing portion has a second surface facing upward. The first surface has: a contact region in contact with the second surface; and a first protruding region protruding from the contact region at least outward in a radial direction of the bearing when viewed in the up-down direction.