Flow Formed Differential Casing with Locating Surfaces
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Solution Overview
Problem
Existing methods for manufacturing differential gear casings for vehicle axles, such as casting, hot forging, and flow forming, have limitations in producing a durable and efficiently assembled casing that aligns central axes and securely mounts rotational and speed sensing gears.
Innovation Solution
The method involves flow forming two casing halves with specific features like hemispherical portions, radial flanges, and locating surfaces to align and secure them with fasteners, and mounting an annular ring gear and rotational speed sensing gear, with complementary positioning formations for pinion shafts and ring gear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional casting methods are used to manufacture differential gear casings, then manufacturing simplicity is maintained, but manufacturing precision and alignment of central axes deteriorate
Solution Approach 1:
The differential gear casing is divided into two separate casing halves, each manufactured with precision flow forming. This segmentation allows each half to be independently formed with accurate central axis alignment, eliminating the alignment problems inherent in conventional casting methods while maintaining manufacturing feasibility through modular assembly.
Solution Approach 2:
The flow forming process is applied to create casing halves with pre-formed locating surfaces and precise geometric features before assembly. This preliminary precision forming ensures that when the halves are assembled, the central axes are automatically aligned through the complementary locating surfaces, eliminating the need for post-manufacturing alignment operations.
2Reliability
If casing halves are assembled with fasteners through radial flanges, then secure assembly is achieved, but device complexity increases due to additional positioning requirements
Solution Approach 1:
Complementary locating surfaces are introduced as intermediary positioning elements between the two casing halves. These surfaces, formed during the flow forming process, act as mediators that automatically align the central axes and establish precise relative positioning of the casing halves before fastener insertion, simplifying the overall assembly process while ensuring reliable positioning.
Solution Approach 2:
The casing halves are designed with self-aligning features where the locating surfaces on each half automatically guide and position the other half during assembly. This self-service positioning mechanism eliminates the need for complex external alignment tools or procedures, reducing device complexity while ensuring secure and accurate assembly.
3Manufacturing precision
If flow forming is used to create locating surfaces, then manufacturing precision of locating surfaces is improved, but use of energy increases during the forming process
Solution Approach 1:
The flow forming process utilizes controlled parameter changes in material flow and forming pressure to achieve high precision locating surfaces. By optimizing the forming parameters such as material velocity, forming pressure, and tool geometry, the process achieves superior surface precision while minimizing energy consumption through efficient material deformation rather than high-energy removal processes.
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 method ensures precise alignment and secure assembly of differential gear components, enhancing the durability and functionality of the differential gear casing by providing a smooth sliding surface and efficient rotational driving mechanism.
Implementation Method 1
flow forming a first blank about an associated central axis to provide a first casing half having a generally hemispherical portion, a shaft journal portion extending from the hemispherical portion
Implementation Method 2
the locating surfaces thereof contacting each other to provide positioning of the central axes in alignment with each other
Implementation Method 3
fasteners can be inserted to secure the casing halves to each other with the locating surfaces thereof contacting each other
Implementation Method 4
An annular ring gear is mounted on the radial flange of the first casing half to permit rotational driving
Data Source
AI summary
A method for making a differential gear casing (22) flow forms a first casing half (30) and forms a second casing half (32), both with hemispherical portions (34 and 52) and with radial flanges (36 and 56) with the latter also having an axial projection (58). An interior positioning surface (38) of the first casing half (30) and an exterior positioning surface (60) of the second casing half (32) position the casing halves with respect to each other.