Differential Housing Speed Target Integrated Into Ring Gear Support
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Solution Overview
Problem
Existing speed measurement systems for rotating transmission elements, such as differential crowns, face challenges with target deformation and detachment over time, requiring spot welds for stabilization.
Innovation Solution
A differential housing with a cylindrical outer bearing surface featuring an orthogonal ring-shaped shoulder having radially oriented grooves and ribs, serving as a target for measuring rotation speed, is designed to avoid deformation and detachment issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a target is sleeved and shrunk onto the bridge crown, then the speed measurement is enabled, but the target deforms and detaches from the crown over time
Solution Approach 1:
The target is merged with the housing by casting it as an integral part of the housing structure. The target is formed directly on the bearing surface of the crown, eliminating the need for separate attachment processes like sleeving and shrinking. This integration ensures the target remains fixed and stable throughout operation.
Solution Approach 2:
Instead of attaching a separate target to the crown, the invention creates the target directly on the housing's bearing surface. The target pattern (grooves and ribs) is copied or formed directly into the housing material during casting, providing a permanent and stable measurement reference.
2Reliability
If spot welds are used to strengthen the connection between the target and the crown, then the target stability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The target and housing are merged into a single cast component. The target is formed as an integral part of the housing during the casting process, eliminating the need for separate assembly steps such as welding or mechanical fastening. This simplifies manufacturing while ensuring permanent stability.
Solution Approach 2:
The target is created during the initial housing casting process rather than being added later. The grooves and ribs forming the target are incorporated into the mold or pattern used for casting the housing, so the target is already in place and properly attached before the housing is assembled to the crown.
3Adaptability or versatility
If the target is made as a separate component, then the manufacturing flexibility is improved, but the assembly constraints and attachment requirements increase
Solution Approach 1:
The target is combined with the housing into a single component. This integration eliminates the need for separate assembly operations while maintaining the functional requirements of the target. The housing is cast with the target features already incorporated, simplifying the overall assembly process.
Solution Approach 2:
The housing serves multiple functions: it provides structural support, houses the differential mechanism, and incorporates the speed measurement target. By making the housing multi-functional, the invention reduces the total number of components and assembly steps while maintaining all necessary functions.
Data Source
Figure 1~2
Figure 3
AI summary
Disclosed is a housing for a motor vehicle transmission differential (5), comprising a cylindrical outer bearing surface (5b) for supporting a differential ring gear (7), characterised in that the supporting bearing surface (5b) of the ring gear (7) is surmounted on one edge by an annular orthogonal shoulder (13) having on its circumference a regular alternation of ridges (6a) and ribs (6b) with radial orientation, all of which constitutes a target (6) for measurement of the rotational speed of the housing (5).