Self-Retaining Differential Assembly Without Rivets or Screws
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Solution Overview
Problem
Existing differentials require costly and complex fastening methods, such as rivets and screws, which increase manufacturing and assembly costs and may compromise precision due to the need for threading and screwing, and often require separate components for pinion gear mounting.
Innovation Solution
A self-retaining differential design where pinion gears are held in bearing points within the drive wheel's flange, with covers fastened via material connections like welding, eliminating the need for additional fastening means and allowing for identical, cost-effective cover production and integration of output wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rivets or screws are used to fasten covers to the drive wheel, then the differential can be assembled and closed, but the manufacturing and assembly costs increase and the precision of the structural unit decreases
Solution Approach 1:
The patent removes fastening means (rivets, screws, dowel pins) from the differential structure. The covers are fastened to the drive wheel by material connections (welding) directly, eliminating the need for separate fastening components. This extraction of unnecessary elements reduces device complexity and improves manufacturing precision.
Solution Approach 2:
The patent combines the fastening function with the cover structure itself. The covers are designed with integrated fastening capabilities through material connections to the drive wheel flange, merging the cover and fastening means into a single integrated component rather than separate parts.
2Productivity
If rivets or screws are used for fastening, then the differential can be assembled, but the assembly costs and time increase due to threading and screwing operations
Solution Approach 1:
The patent eliminates fastening means (rivets, screws, dowel pins) from the differential structure. The covers are fastened to the drive wheel by material connections (welding) directly, eliminating the need for separate fastening components. This extraction of unnecessary elements reduces device complexity and improves manufacturing precision.
Solution Approach 2:
The differential structure is designed to be self-retaining, where the covers themselves provide the fastening function through material connections to the drive wheel. The system serves its own fastening needs without requiring external fastening components or complex assembly operations.
3Reliability
If separate components like bars or cages are used for mounting pinion gears, then the pinion gears can be securely mounted, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the pinion gear mounting function with the drive wheel flange structure. The bearing points are formed directly in the flange, and the pinion gears are mounted directly on these bearing points without requiring separate bars, cages, or other mounting components. This integration reduces the number of parts while maintaining secure mounting.
Solution Approach 2:
The drive wheel flange is designed to serve multiple functions: it provides structural support, forms bearing points for pinion gear mounting, and integrates with the covers through material connections. This multi-functionality eliminates the need for separate dedicated mounting components.
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
This design reduces costs, simplifies assembly, enhances precision by eliminating the need for threading and screwing, and integrates output wheels easily, improving the precision of tooth contact with output wheels while allowing for diverse material usage and manufacturing processes.
Implementation Method 1
The cover is fastened to the drive wheel by at least one material connection without the action or effect of further fastening means
Data Source
AI summary
A differential (1) includes pinion gears (2, 3), a drive wheel (4), and at least one cover (5, 13), wherein: the outside of the drive wheel (4) has toothing (7) extending circumferentially around an axis of rotation (6) and the inside of the drive wheel is provided with bearing points (8, 9); the pinion gears (2, 3) are mounted on the bearing points (8, 9) in the drive wheel (4); and the differential (1) is closed on at least one side by the at least one cover (5, 13).