Mouse Control Rotor Mounting for Compact MR Braking
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Solution Overview
Problem
Existing control devices require significant installation space due to the need for robust mounting and braking mechanisms, particularly in compact items like computer mice and steering wheels, which limits their design and functionality.
Innovation Solution
The control device features a rotor unit mounted independently of the stator unit, with bearing forces diverted into a support body, reducing axial installation space and allowing for a more compact design while maintaining robustness and effective braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the rotor unit is mounted on the stator unit with bearings pushed onto the stator shaft, then the control device can be assembled, but it requires a particularly large amount of axial installation space
Solution Approach 1:
The rotor unit is extracted from the conventional mounting arrangement where it is pushed onto the stator shaft with bearings, and instead is mounted independently on the support body. This separation removes the rotor mounting from the stator assembly path, eliminating the need for axial space consumption by bearings on the stator shaft and allowing the stator unit to be positioned more compactly.
Solution Approach 2:
The mounting arrangement transitions from a conventional axial arrangement where bearings are pushed onto the stator shaft along the axial direction, to a radial mounting where the rotor unit is supported by bearing units that are radially arranged on the support body. This dimensional change in mounting approach significantly reduces the axial installation space requirement.
2Volume of moving object
If narrow bearings are used to reduce installation space, then axial length is reduced, but bearing surface area decreases and force absorption capacity is reduced
Solution Approach 1:
The bearing units are arranged radially on the support body rather than axially on the stator shaft. This radial arrangement allows the bearings to be positioned at an optimal radius from the rotation axis, providing sufficient bearing surface area and force absorption capacity while minimizing the axial length of the control device.
3Volume of moving object
If the braking device is integrated into the stator unit, then space is utilized efficiently, but the stator unit and rotor unit are subjected to overturning moments and shear forces
Solution Approach 1:
The rotor unit mounting is extracted from the stator unit assembly, creating an independent mounting path on the support body. This separation eliminates the transmission of overturning moments and shear forces from the rotor through the stator shaft and stator unit to the braking device, stabilizing the structural composition of the stator unit.
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
This design reduces installation space requirements, enhances durability, and ensures reliable operation with minimal friction and overturning moments, enabling compact yet robust performance in devices like computer mice and steering wheels.
Implementation Method 1
The braking device has a magnetorheological medium (MR fluid) as braking medium
Implementation Method 2
The magnetic-field-generating device comprises, for example, at least one electric coil and, in particular, at least one coil core
Implementation Method 3
the rotor unit is mounted by means of at least one bearing unit of at least one bearing device
Data Source
AI summary
The invention relates to a control device with a stator unit fastened via a stator connection to a support body, and a rotor unit rotatable about the stator unit. The rotatability of the rotor unit about the stator unit can be influenced in a targeted manner by means of a braking device. For its rotatability about the stator unit, the rotor unit is mounted on the support body by means of at least one bearing unit of a bearing device, so that a force acting on the rotor unit from radially outside can be diverted via the bearing unit into the support body, bypassing the stator unit and the stator connection.