Bevel Gear Differential Assembly With Bolt-Supported Drive Gear
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Solution Overview
Problem
Existing bevel gear differentials for motor vehicles are complex and costly to manufacture and assemble, with existing connections subjecting components to high mechanical stress.
Innovation Solution
A bevel gear differential design featuring a differential bolt with receiving recesses at its ends, supporting the drive wheel axially, and a drive gear that surrounds the gearbox housing, allowing for a simple and robust assembly without additional fasteners, using a differential pin to support the drive wheel and distribute torque between output gears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional connection methods (welding, additional fasteners) are used to connect the drive gear to the gearbox housing, then the connection strength is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The differential bolt serves dual functions: it supports the planet gear rotationally and simultaneously provides axial support for the drive gear through its receiving recesses. This merging of support functions eliminates the need for separate axial support components or additional fasteners, reducing assembly complexity while maintaining connection strength
Solution Approach 2:
The differential bolt is designed as a multi-functional component that not only mounts the planet gear but also provides axial positioning for the drive gear via its receiving recesses. This universal component replaces what would traditionally require multiple separate parts, simplifying the overall assembly without compromising structural integrity
2Reliability
If additional fasteners and complex connection methods are used, then the reliability of the connection is improved, but the ease of manufacture and assembly deteriorates
Solution Approach 1:
The receiving recesses in the differential bolt combine the axial support function with the existing planetary gear mounting function, eliminating the need for separate axial support fasteners or welding operations. This reduces the number of assembly steps while maintaining reliable mechanical support
Solution Approach 2:
The axial support function is extracted from the planet gear mounting operation and integrated into the differential bolt design itself. By taking out the need for separate axial support components and incorporating it into the existing differential bolt structure, the assembly process is simplified without sacrificing reliability
3Strength
If the drive wheel fully overlaps the differential bolt in the axial direction, then the axial support is improved, but the mechanical stress on the connection increases
Solution Approach 1:
The receiving recesses are positioned at the ends of the differential bolt, providing localized axial support only where needed for the drive gear. This localized support approach avoids creating high stress concentrations that would result from full axial overlap, distributing the mechanical load more favorably while maintaining adequate support
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to a bevel gear differential gearing (1) for a motor vehicle, having a gearing housing (2), in which a first output gear (5), a second output gear (6) and at least one planetary gear (8) meshing both with the first output gear (5) and with the second output gear (6) are rotatably mounted and to which a drive gear (7) is non-rotationally connected. Provision is made for the drive gear (7) to bear with an inner circumferential surface (25) against an outer circumferential surface (26) of the gearing housing (2) so as to engage around the gearing housing (2) and to be supported in the axial direction with respect to its axis of rotation (15) on a differential bolt (9) which protrudes out of the gearing housing (2) through a bolt receptacle and on which the at least one planetary gear (8) is rotatably mounted. The invention further relates to a method for producing a bevel gear differential gearing (1) for a motor vehicle.