Torque Transmission Shaft Hub Spring Preloading
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Solution Overview
Problem
Conventional torque transmission devices in motor vehicles experience noise and increased wear due to radial tolerance in shaft-hub connections, and existing braking elements are complicated to fasten.
Innovation Solution
A torque transmission device featuring a shaft with an outer toothing and a hub with an inner toothing, where a spring element traverses the hub and is supported on both the shaft and hub, exerting a spring force that stabilizes the relative position of the shaft and hub, preventing relative rotation and radial movement, thus reducing noise and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shaft-hub connections with toothings are used to transmit torque, then torque transmission is achieved, but radial tolerance causes noise and increased wear
Solution Approach 1:
The patent introduces a spring element that applies radial preloading force to the shaft-hub connection, changing the contact parameters between the tooth flanks. This preloading eliminates radial clearance and ensures continuous contact between adjacent tooth flanks, preventing noise and wear caused by radial tolerance during operation
Solution Approach 2:
The spring element provides beforehand cushioning by pre-compressing the radial tolerance between shaft and hub before operation begins. This pre-compression ensures that the tooth flanks are already in firm contact, preventing impact and noise that would occur without such preloading
2Object-affected harmful factors
If braking elements partially engage in the toothing from outside, then some noise reduction is achieved, but the fastening becomes complicated
Solution Approach 1:
The patent extracts the noise-reducing function from complex externally fastened braking elements and integrates it into a simple spring element that is supported on the shaft and hub. The spring element achieves noise reduction through radial preloading without requiring complex external fastening mechanisms
Solution Approach 2:
The spring element is designed to be self-sufficient, supported directly on the shaft and hub structures already present in the torque transmission device. It eliminates the need for separate fastening mechanisms by utilizing the existing structural components for its support and force application
3Object-affected harmful factors
If spring force is applied to suppress rotation between shaft and hub, then noise and wear are reduced, but axial compensation for tolerances must still be permitted
Solution Approach 1:
The patent segments the functional requirements by separating radial constraint (handled by spring element) from axial compensation (handled by free tooth flank design). This allows the spring element to focus on eliminating radial clearance for noise and wear reduction, while the tooth flank geometry independently provides axial compensation capability
Solution Approach 2:
The patent applies local quality by designing the spring element to act specifically in the radial direction where noise and wear problems occur, while leaving the axial direction free for compensation. The spring force is oriented to press adjacent tooth flanks against each other radially, without constraining axial movement needed for tolerance compensation
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
The spring element effectively suppresses rotation between the shaft and hub, reducing noise and wear by ensuring adjacent tooth flanks engage fully, while allowing axial compensation for manufacturing tolerances and temperature differences, and simplifying mounting with cost-effective production.
Implementation Method 1
at least one spring element which completely traverses the hub and is supported on the shaft and the hub and exerts a spring force on the hub and the shaft
Implementation Method 2
adjacent flanks of the shaft toothing and the hub toothing are pressed against each other along the entire circumference of the shaft and the hub
Data Source
AI summary
A torque transmission device includes a shaft which has shaft teeth around its outer circumference, a hub which has hub teeth on an inner circumference, wherein the hub is arranged on the shaft in such a way that the shaft teeth and the hub teeth mesh with one another in order to transmit torque. The torque transmission device furthermore includes at least one spring element which passes entirely through the hub and is supported on the shaft and the hub and exerts a spring force on the hub and the shaft, wherein at least a component of the spring force is directed in such a way that around the entire circumference of the shaft and hub adjacent flanks of the shaft teeth and the hub teeth are pushed together.