CV Joint Outer Hub Elliptical Ball Tracks Torque
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Solution Overview
Problem
Existing transmission systems with universal joints and constant velocity joints are not capable of withstanding the higher torque loads expected from future vehicle engines, leading to non-synchronous operation and mechanical limitations.
Innovation Solution
The outer hub is arranged between a shoulder of the gear wheel body and a bearing cover or a bead, with elastically deformable components and ball tracks that maintain a constant control angle throughout the joint's range of motion, ensuring consistent torque transmission and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If universal joints are used in helical bevel gears, then the joint can be inserted and welded, but the joint cannot withstand the torque loads from future vehicle engines and exhibits non-synchronous operation
Solution Approach 1:
The invention changes the geometric parameters of the ball tracks from conventional circular arcs to ellipses with specifically calculated semi-axes. This parameter change enables the control angle to remain constant during joint flexion, achieving synchronous operation while maintaining high torque load capacity through the robust outer hub arrangement between gear body shoulder and bearing cap/bead
2Reliability
If conventional ball track curvatures are used, then the joint structure is simple, but the control angle varies during flexion causing non-synchronous operation
Solution Approach 1:
The invention replaces conventional circular arc ball tracks with elliptical ball tracks. The elliptical curvature is specifically designed so that the control angle remains constant during joint flexion. The ellipses have semi-axes calculated from the joint geometry to ensure constant control angle, achieving synchronous operation while maintaining manufacturability
3Strength
If the outer hub is firmly connected to the gear wheel body, then the joint can transmit higher torques, but the assembly and disassembly becomes difficult
Solution Approach 1:
The invention segments the connection system into three parts: the gear wheel body with shoulder, the outer hub, and the bearing cap. This segmentation allows firm torque transmission through the shoulder-hub-cap arrangement while enabling assembly by pressing the hub between shoulder and cap, and disassembly by removing the bearing cap. The elastically deformable nose on the bearing cap facilitates this process
Solution Approach 2:
The bearing cap acts as an intermediary element between the gear wheel body shoulder and the outer hub. It provides the necessary constraint for torque transmission while being removable to allow assembly and disassembly. The elastically deformable nose on the bearing cap serves as a mediator to compensate for tolerances and facilitate the pressing operation
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 configuration allows for the transmission of higher torques while maintaining a constant control angle, enhancing the mechanical stability and efficiency of the joint, even under flexion, thereby addressing the limitations of prior art.
Implementation Method 1
insbesondere ein elastisch verformbares oder plastisch verformbares oder resilientes Lagerkap
Implementation Method 2
Das Lagerkap hat eine Nase, die dem äußeren Gelenkzentrum gegenüberliegt und insbesondere elastisch verformbar oder plastisch verformbar oder resilient ist
Data Source
AI summary
The invention relates to an arrangement with a joint (99) and a gearwheel body (100) for a transmission, wherein the joint is arranged at least partially in an interior space enclosed by the gearwheel body. The invention includes the fact that the joint is a constant velocity joint.