Steering Device Overload Clutch Protection
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Solution Overview
Problem
Steering devices with superposition gearings are prone to overloading, particularly when the steering wheel is rotated with excessive force or when a vehicle is jacked up, leading to torque transmission that can damage the gearing.
Innovation Solution
Incorporating an interface, such as an overload clutch, that limits or separates the force transmission between the steering shaft and the superposition gearing when a defined torque is exceeded, protecting the gearing from damage and allowing for different torque thresholds for switching mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering shaft is directly connected to the superposition gearing, then the steering system is simple and direct, but the superposition gearing is vulnerable to overloading and damage
Solution Approach 1:
An interface element is introduced as an intermediary between the steering shaft and the superposition gearing. This interface includes a clutch sleeve with a press-fit connection that acts as a mechanical mediator, allowing normal torque transmission while protecting against overload conditions by limiting the maximum force transmitted to the gearing.
Solution Approach 2:
The press-fit connection in the clutch sleeve is designed with predetermined mechanical properties that allow it to slip or deform under excessive torque. This provides beforehand cushioning by limiting the maximum torque that can be transmitted to the superposition gearing, preventing damage before it occurs.
2Reliability
If an overload protection interface is added to the steering device, then the superposition gearing is protected from damage, but the device complexity increases
Solution Approach 1:
The overload protection function is merged into the existing steering shaft connection structure. The clutch sleeve serves dual purposes: it connects the steering shaft to the superposition gearing while simultaneously providing overload protection through its press-fit connection, eliminating the need for separate protection mechanisms.
Solution Approach 2:
The interface element (clutch sleeve) is designed to perform multiple functions: it transmits torque during normal operation, limits torque during overload conditions, and can be integrated with anti-theft device components. This multi-functionality reduces the need for additional separate components.
3Reliability
If a force-fitting press connection is used in the overload clutch, then the torque threshold for slipping is defined, but the manufacturing precision requirements increase
Solution Approach 1:
The torque threshold of the overload clutch is defined by changing the mechanical parameters of the press-fit connection, specifically the interference fit dimensions between the clutch sleeve and the steering shaft. By carefully selecting the press-fit dimensions, a consistent and reliable torque threshold is achieved without requiring extremely high manufacturing precision.
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 solution effectively prevents overloading of the superposition gearing by limiting or disconnecting force transmission, ensuring the gearing's longevity and allowing for controlled steering even under high torque conditions, while also integrating an anti-theft device for enhanced security.
Implementation Method 1
The interface may fundamentally also be designed in some other way, for example as an electrical device which, in the presence of the defined condition, actuates shift elements which separate or limit the transmission of force between the steering shaft and superposition gearing
Data Source
AI summary
A steering device for a motor vehicle is provided. The steering device has a steering wheel, having a steering shaft and having a superposition gearing which is arranged in or on the steering wheel and which is designed to transmit a motor-driven adjusting movement to the steering shaft. In one form, at least one interface is provided which, in the presence of a defined condition, separates or limits a transmission of force between the steering shaft and the superposition gearing. The interface is for example an overload clutch.