Bearing Assembly Shield Axial Retaining Scissors Gear
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Solution Overview
Problem
The existing bearing assemblies for balancing shafts in motor vehicles are costly due to the expensive grinding process required for massive outer rings, which are necessary to support scissors gears and reduce backlash, and there is a need for a more affordable and easier-to-manufacture solution.
Innovation Solution
A bearing assembly with an outer massive ring featuring an annular radial groove and a shield with bent tongues, which provides an axial retaining arrangement that is easy to manufacture and reduces material costs, allowing for a standard rolling bearing to support a scissors gear with a main and auxiliary gear configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a massive outer ring with axial blocking flange is provided to support scissors gear, then the scissors gear can be properly supported and backlash reduced, but the manufacturing cost increases due to required grinding process
Solution Approach 1:
The axial retaining function is segmented from the outer ring structure itself and transferred to a separate shield component. The shield contains an axial blocking flange that provides the retaining function, while the outer ring only requires a simple groove for shield mounting, eliminating the need for complex grinding operations on the outer ring.
Solution Approach 2:
A shield is introduced as an intermediary component between the outer ring and the scissors gear. This shield carries the axial blocking flange that actually performs the retaining function, while the outer ring only needs to provide a mounting groove for the shield, significantly simplifying its manufacturing requirements.
2Stability of the object's composition
If a massive outer ring with axial blocking flange is provided to maintain auxiliary gear axially, then the auxiliary gear positioning is ensured, but additional grinding steps are required increasing manufacturing time
Solution Approach 1:
The axial positioning function is separated from the outer ring and assigned to the shield component. The outer ring only requires a simple groove formation, while the shield contains the axial blocking flange that actually positions the auxiliary gear, reducing manufacturing steps.
Solution Approach 2:
The shield with its axial blocking flange is prepared in advance and then simply mounted into the groove on the outer ring. This preliminary preparation allows for quick assembly without requiring complex in-situ machining operations during the main manufacturing process.
3Reliability
If a massive outer ring is used to support scissors gear, then proper gear support is achieved, but material costs increase
Solution Approach 1:
The shield acts as an intermediary that carries the axial blocking flange functionality. This allows the outer ring to be made with less material and simpler geometry (only requiring a groove), while the shield provides the necessary support and positioning functions.
Solution Approach 2:
The axial blocking flange functionality is extracted from the massive outer ring structure and placed into a separate, more compact shield component. This extraction allows the outer ring to be optimized for its primary function (supporting rolling elements) while the shield handles the gear retention function.
Data Source
AI summary
A bearing assembly comprising a rotating shaft, a rolling bearing and a scissors gear. The bearing assembly further comprises an axial retaining system for the scissors gear onto the rolling bearing. A shield is arranged in a groove of an outer massive ring of the rolling bearing.