Axlebox Assembly Segmentation for Standard Tool Use
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Solution Overview
Problem
The assembly of axleboxes with dismountable bearings is cumbersome and requires reinforced tools due to the weight and complexity of assembled bearing units, whereas non-dismountable bearing units are heavy and difficult to assemble using standard tools.
Innovation Solution
An axlebox assembly design featuring a housing with a rear cover and cap, where the rotary bearing is pre-assembled with a backing ring and cap, allowing for sequential assembly of parts using standard tools, with the rear cover and housing being fixed separately to simplify the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If non-dismountable bearing units are used, then service life is extended and maintenance is reduced, but the assembly weight increases and standard tools cannot be used for assembly
Solution Approach 1:
The bearing unit is segmented into separable components: the outer ring with rolling elements can be assembled into the housing separately, and then the inner ring with cap and backing ring are assembled onto the journal separately. This segmentation allows standard assembly tools to be used for each component while achieving the same service life as non-dismountable units.
2Ease of repair
If non-dismountable bearing units are pre-assembled with housing, then maintenance is reduced, but the assembly process requires reinforced tools due to weight
Solution Approach 1:
The assembly process is segmented into multiple manageable steps using standard tools: first the outer ring assembly is installed in the housing, then the inner ring and cap assembly is installed on the journal. This segmentation makes the maintenance process easier while avoiding the need for reinforced assembly tools.
Solution Approach 2:
The bearing components are pre-assembled in separable units (outer ring with rolling elements, inner ring with cap) before final installation. This preliminary assembly of modular components facilitates easier maintenance while remaining compatible with standard assembly tools.
3Adaptability or versatility
If dismountable bearings are assembled separately, then assembly flexibility is improved, but the assembly process becomes cumbersome and requires reinforced tools
Solution Approach 1:
The bearing is segmented into modular components that can be assembled separately using standard tools. The outer ring assembly and inner ring assembly are independent modules that can be handled separately, providing assembly flexibility without requiring reinforced tools.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to an axlebox assembly (1) comprising a housing (4), at least one rotary bearing (7), a backing ring (18), and a cap (19). The housing (4) comprises a hollow body (5) having a bore (5-1) with a rear opening to accommodate a shaft end journal (3). The rotary bearing (7) has a fixed outer ring (8) mounted in the housing bore (5-1), a rotating inner ring (9, 10) mountable on an outer cylindrical surface (3-1) of the shaft end journal (3), and at least one row of rolling elements (11, 12) interposed between the rings (8, 9, 10). Tthe inner ring (9, 10) is mounted in axial abutment against the backing ring (18) on rear side, and in axial abutment against the cap (19) on front side, the said cap (19) being fixed to the journal end (3). According to the invention, the housing (4) is closed on front side by a front radial plate (6), the said cylindrical body (5) and front radial plate (6) being formed integral and defining an inner shoulder (5-2) extending radially inwardly in the bore (5-1) on front side. The axlebox assembly (1) further comprises a rear cover (16) fixed to the housing cylindrical body (5) so as to close the rear opening. The outer ring (8) is mounted in axial abutment against the said rear cover (16) on rear side, and in axial abutment against the housing inner shoulder (5-2) on front side.