Joystick Magnetorheological Brake for Compact High-Torque Haptics
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Solution Overview
Problem
Conventional joysticks face challenges in providing high torque with compact and cost-effective designs, often requiring large and expensive actuators, which occupy significant space and are complex to implement, especially in applications like utility vehicles and gaming where realistic force feedback is needed.
Innovation Solution
A joystick design incorporating a magnetorheological brake device with a rotary damper that provides controlled damping of the operating lever, allowing for targeted deceleration torques and haptic feedback, enabling compact and efficient operation with adjustable damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If electric motors or hydraulic/pneumatic cylinders are used to generate high torque for realistic force feedback, then the operating quality and force feedback realism are improved, but the device size, complexity, and cost increase significantly
Solution Approach 1:
The patent replaces complex electric motors or hydraulic/pneumatic cylinders with a magnetorheological brake device that uses magnetic field control of a rheological fluid to generate damping torques. This substitution reduces mechanical complexity while maintaining the ability to generate high torques for force feedback, as the magnetorheological system can produce up to 100 Nm of torque through controlled fluid viscosity changes rather than complex actuation mechanisms
Solution Approach 2:
The patent changes the physical parameter of the brake device by utilizing the magnetorheological effect, where the viscosity of the rheological fluid can be dynamically adjusted through magnetic field strength. This allows the damping torque to be varied from minimal to maximum levels, enabling realistic force feedback without requiring multiple discrete mechanical components or complex control systems
2Force
If electric motors or hydraulic/pneumatic cylinders are used to generate high torque for realistic force feedback, then the operating quality and force feedback realism are improved, but the mounting space required increases
Solution Approach 1:
The patent replaces space-consuming electric motors or hydraulic/pneumatic cylinders with a compact magnetorheological brake device. The brake device generates high torques (up to 100 Nm) through magnetic field control of a rheological fluid contained within a compact housing, eliminating the need for large actuator assemblies and reducing mounting space requirements while maintaining force feedback capabilities
3Ease of operation
If complex gear transmissions and Cardan shafts are used for movement transmission, then the operating quality is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates complex intermediate transmission elements such as gear transmissions and Cardan shafts from the system. The magnetorheological brake device is directly coupled to the pivot axis, allowing movement transmission without complex mechanical intermediaries. This simplification reduces manufacturing complexity and cost while maintaining operating quality through direct actuation
4Ease of manufacture
If vibration motors are used for force feedback, then the cost is reduced, but the torque generation capability is insufficient
Solution Approach 1:
The patent changes the physical parameter of the brake device by utilizing the magnetorheological effect, where the viscosity of the rheological fluid can be dynamically adjusted through magnetic field strength. This allows the damping torque to be varied from minimal to maximum levels, enabling realistic force feedback without requiring multiple discrete mechanical components or complex control systems
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 operating quality and safety by providing precise and adjustable haptic feedback, reducing mounting space requirements and manufacturing costs while maintaining high torque capabilities, suitable for various applications including utility vehicles and gaming.
Implementation Method 1
The brake device is provided by, or comprises, at least one rotary damper. The rotary damper comprises two counter-pivoting components, which form a damping gap between them, that is filled with a magnetorheological medium.
Data Source
AI summary
An input device, such as a joystick, has an operating device, a magnetorheological brake device, and a controller for activating the brake device. An operating lever is disposed on a supporting structure for pivoting around at least one pivot axis. The brake device is coupled with the pivot axis for controlled damping of a pivoting motion of the operating lever. The brake device has a rotary damper with two components, namely, an inside component and an outside component. The outside component radially surrounds the inside component and a damping gap is formed in between that is filled with a magnetorheological medium. The damping gap can be exposed to a magnetic field to damp a pivoting motion between the two contrapivoting components about an axis. One of the components has radial arms equipped with an electric coil whose winding extends adjacent to and spaced apart from the axis.