Aluminum Transmission Hollow Body Clamping on Internal Tooth Tips
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Solution Overview
Problem
Existing methods for producing and processing cylindrical hollow bodies made of aluminum or aluminum alloys for motor vehicle transmissions are complex, particularly in clamping and balancing, which can lead to undesirable deformation and imbalance, affecting torque transmission and concentricity.
Innovation Solution
A method involving central clamping on the tip circle diameter of internal toothing during casting and machining, with precise alignment and balancing using balancing holes to ensure accurate geometric precision and concentricity, and exclusive use of tooth flanks for torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the hollow body is clamped centrally on a bearing surface for installation (tooth flanks) during balancing, then the balancing can be performed, but the clamping becomes complex and may cause deformation
Solution Approach 1:
The patent divides the functional surfaces of the hollow body into separate zones: the tip diameter area is dedicated exclusively to clamping operations, while the tooth flanks are reserved for torque transmission and installation. This segmentation allows each surface to be optimized for its specific function without interference, simplifying the clamping mechanism while maintaining manufacturing precision.
Solution Approach 2:
Instead of using the tooth flanks (the obvious choice for installation) as the clamping surface, the patent inverts the approach by using the tip diameter area for clamping. This counterintuitive solution eliminates the complexity of clamping gears onto tooth flanks while preventing deformation of the critical torque transmission surfaces.
2Reliability
If the hollow body is clamped on tooth flanks for balancing, then balancing can be achieved, but torque transmission and concentricity are affected due to deformation
Solution Approach 1:
The patent separates the clamping function from the torque transmission function by designating different surfaces for each purpose. The tip diameter serves as the clamping surface during manufacturing, while the tooth flanks are preserved for torque transmission in service. This prevents deformation of the tooth flanks that would otherwise occur during clamping, ensuring both reliable torque transmission and accurate concentricity.
3Ease of manufacture
If the same surface is used for both clamping and installation, then the process is simplified, but the torque transmission capability is reduced
Solution Approach 1:
The patent implements functional segmentation by assigning the tip diameter area to clamping operations and the tooth flanks to torque transmission. This allows the manufacturing process to be simplified through centralized clamping while preserving the full torque transmission capability of the tooth flanks, as they are not compromised by clamping forces.
Solution Approach 2:
The tip diameter area serves multiple functions: it provides a bearing surface for clamping during machining and balancing operations, and it maintains the geometric precision needed for accurate tooth flank engagement during torque transmission. This multi-functionality achieves process simplification without sacrificing torque transmission reliability.
Data Source
Figure 1~3
AI summary
The invention relates to a method for producing and machining a cylindrical hollow body (20) consisting of aluminium or an aluminium alloy and for arranging said hollow body in a motor vehicle transmission (29), wherein the hollow body (20) is produced by means of a casting process (1) in such a way that the hollow body (20) has an inner and an outer lateral surface (21, 22) and has teeth (24) in at least one sub-region (23, 23') of the inner lateral surface (21), wherein, for the machining, the hollow body (20) is centrally clamped (2), and wherein the hollow body (20) is arranged (6) in the vehicle transmission (29) exclusively by means of tooth flanks (27) of the internal teeth (24). The method according to the invention is characterized in that the hollow body (20) is centrally clamped (2) exclusively at a tip diameter (25) of the internal teeth (24, 24'). The invention further relates to a corresponding cylindrical hollow body (20) and to a corresponding vehicle transmission (29).