Auxiliary Steering Device With Planetary Gearing for Hydrostatic Vehicles
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Solution Overview
Problem
Hydrostatic vehicle steering systems lack a straightforward mechanism for implementing additional or auxiliary functions, as there is no direct mechanical passage between the steering handle and steering cylinder, making it difficult to integrate complex interventions without significant modification.
Innovation Solution
An auxiliary steering device with an input shaft, output shaft, planetary gearing, electric drive, braking device, and coupling device, allowing various functions to be implemented through the interaction of these components, including emergency and assistance modes, which are controlled by an electronic control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hydrostatic vehicle steering system is used, then actuating forces for heavy vehicles can be generated effectively, but additional or auxiliary functions can be implemented only with comparatively high effort due to lack of direct mechanical passage
Solution Approach 1:
An auxiliary steering device is introduced as an intermediary mechanism between the steering handle and the existing hydrostatic steering system. This device includes an input shaft connected to the steering handle, planetary gearing for motion transformation, and an output shaft that interfaces with the steering cylinder, thereby enabling auxiliary functions without modifying the core hydrostatic system
Solution Approach 2:
The steering system is segmented into independent functional modules: the original hydrostatic steering system remains intact, while the auxiliary steering device operates as a separate but coordinated system with its own input shaft, planetary gearing, and output shaft, allowing flexible implementation of auxiliary functions
2Adaptability or versatility
If planetary gearing with electric drive is added to the steering system, then multiple auxiliary functions can be implemented, but the device construction becomes more complex
Solution Approach 1:
The auxiliary steering device is designed as a universal mechanism that can implement multiple auxiliary functions through a single integrated structure. The planetary gearing system with electric drive and controllable coupling/deviating means can perform various steering assistance functions, emergency steering, and other auxiliary operations without requiring separate mechanisms for each function
Solution Approach 2:
The auxiliary steering device incorporates dynamic control elements including an electric drive with controllable coupling means that can engage or disengage the planetary gearing from the output shaft, and deviating means that can redirect the steering motion. This dynamic functionality allows the same physical structure to perform multiple different auxiliary functions by changing its operational state rather than requiring separate mechanical pathways
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
Enables the integration of multiple auxiliary functions in hydrostatic steering systems with minimal modification, providing robust operation and compatibility with different steering types, while ensuring driver control and assistance in various operating modes.
Implementation Method 1
The auxiliary steering device has input shaft (44) which can be actuated or set in rotation by a steering handle (24), output shaft (46) for actuating a steering metering valve or orbitrol (32), and planetary gearing (48). The planetary gearing comprises a planetary wheel carrier (50) with multiple planetary wheels (52), which mesh with a sun gear (54) and a surrounding ring gear (56), the input shaft being connected to the planetary wheel carrier and the output shaft being connected to the sun gear
Implementation Method 2
The auxiliary steering device has an electric drive (58) for exerting a torque on the ring gear (56)
Implementation Method 3
a braking device (60) for fixing the input shaft (44)
Data Source
AI summary
An auxiliary steering device for a hydrostatic vehicle steering system, includes an input shaft, which can be actuated or set in rotation by a steering wheel, an output shaft for actuating a steering metering valve, and a planetary gearing. The planetary gearing includes a planetary wheel carrier with multiple planetary wheels, which mesh with a sun gear and a surrounding ring gear. The input shaft is connected to the planetary wheel carrier and the output shaft is connected to the sun gear in each case for conjoint rotation. The auxiliary steering device has an electric drive for exerting a torque on the ring gear, a braking device for fixing the input shaft, and a coupling device for producing a rotationally fixed connection between the output shaft and the planetary wheel carrier.