Wheel Hub Rotary Pressure Coupling With On-Demand Sealed Contact
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Solution Overview
Problem
Conventional systems for transmitting control and working pressures to vehicle tires face challenges due to the complexity and wear associated with rotary transmission devices, particularly when multiple wheel units are involved, leading to increased costs and reduced durability.
Innovation Solution
A rotary transmission device with a pneumatically actuatable piston element that moves between positions to establish a sealed pressure medium channel, minimizing wear and allowing secure pressure transmission without contact when not in use, and featuring a ring configuration for efficient installation and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rotary transmission devices are used to transmit pressure medium to rotating wheel units, then pressure transmission is achieved, but the devices exhibit increased wear and reduced durability
Solution Approach 1:
The patent replaces continuous mechanical contact with a pneumatic actuation system. The piston element is moved between positions by pressure differential (pneumatic force) rather than mechanical drive, eliminating continuous mechanical friction and wear between the piston and running body. sealing elements only contact during brief transmission phases, dramatically reducing wear.
Solution Approach 2:
The piston element operates in periodic cycles: moved to first position by spring force, held there during non-transmission periods, then moved to second position by pressure differential when transmission is needed. This periodic on-demand contact minimizes wear compared to continuous contact systems.
2Adaptability or versatility
If a central pressure medium supply unit is coupled to multiple wheel units, then autonomous pressure regulation is enabled, but the system complexity and cost increase due to multiple rotary passages
Solution Approach 1:
The system is segmented into independent wheel unit modules, each with its own simplified rotary transmission device. This allows a central supply unit to serve multiple wheel units without requiring complex interconnected rotary passages, as each wheel unit handles its own pressure transmission independently.
Solution Approach 2:
The rotary transmission function is extracted from a centralized complex system and placed at each individual wheel unit. This eliminates the need for multiple rotary passages connecting a central unit to each wheel, simplifying the overall system architecture while maintaining autonomous pressure regulation capability.
3Productivity
If the piston element is continuously in contact with the running body for pressure transmission, then pressure medium delivery is maintained, but wear increases and durability decreases
Solution Approach 1:
The patent uses pneumatic pressure differential to move the piston element between positions rather than continuous mechanical contact. Pressure medium delivers force to move the piston, and spring force returns it, creating a pneumatic-mechanical actuation system that minimizes friction and wear during position transitions.
Solution Approach 2:
The piston element dynamically transitions between two discrete positions (first and second) rather than maintaining continuous contact. This dynamic on-demand positioning allows pressure transmission only when needed, reducing wear while maintaining productivity through rapid position switching enabled by pneumatic actuation.
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 enhances the robustness and durability of the rotary transmission device, reducing wear and maintaining effective pressure transmission across rotating wheel units, thus addressing the limitations of existing systems by ensuring secure and efficient pressure medium delivery.
Implementation Method 1
The piston element (3) is moved in this way by a pressure differential acting on its end face (6) on the running body side
Implementation Method 2
a spring element (125) arranged in a control unit (114)
Data Source
AI summary
A rotary transmission device for transmitting control and/or working pressures to a wheel hub. The rotary transmission device has a housing structure in which a piston element is displaceable between a first and a second position relative to the housing structure and relative to a running body of the wheel hub which is mounted so as to rotate relative to the housing structure. To transmit the control and/or working pressures, at least one pressure medium channel is formed in the piston element. In the first position, an air gap is present between an end face of the piston element on the running body side and an end face of the running body on the piston element side, while in the second position, no air gap is present, and the at least one pressure medium channel opens in sealed fashion into at least one pressure medium channel formed in the running body.