Magnet Assembly Fastening for Stable Brake Motor Position Sensing
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Solution Overview
Problem
Existing electronic brake systems face challenges in maintaining a stable gap between the magnet and the motor position sensor (MPS) to accurately measure motor rotation, which affects the operation of the hydraulic supply device.
Innovation Solution
A hydraulic supply device with a magnet assembly coupled to a rotary shaft, featuring a tolerance ring with rotation restriction protrusions and a high-elastic part to stabilize the magnet's position relative to the MPS, ensuring accurate rotation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate mechanism is added to maintain the gap between magnet and MPS and connect magnet to rotor, then the gap stability and rotation measurement accuracy are improved, but the device complexity increases
Solution Approach 1:
The patent combines the magnet connection function and gap maintenance function into a single integrated structure. The flange is directly formed on the rotor, and the magnet is mounted on this flange, eliminating the need for separate connection mechanisms. This integration maintains the gap stability between magnet and MPS while reducing overall device complexity.
Solution Approach 2:
The flange structure serves multiple functions simultaneously: it acts as both the connection interface for mounting the magnet and the structural element that maintains the gap between magnet and MPS. This multi-functionality resolves the contradiction by achieving gap stability without adding dedicated separate components.
2Device complexity
If the magnet is directly mounted on the rotor without a separate connection mechanism, then the device complexity is reduced, but the gap stability between magnet and MPS deteriorates
Solution Approach 1:
The flange structure merges the mounting function and gap-maintaining function into one component. By forming the flange directly on the rotor and mounting the magnet on this flange, the design achieves structural simplicity while ensuring stable gap maintenance through the rigid connection provided by the flange.
Solution Approach 2:
The flange is pre-formed on the rotor during manufacturing, establishing the gap geometry in advance. This preliminary action ensures that when the magnet is mounted on the flange, the gap between magnet and MPS is automatically maintained at the designed stability without requiring additional adjustment mechanisms.
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 maintains a stable gap between the magnet and MPS, allowing for precise measurement of motor rotation, enhancing the accuracy and stability of the hydraulic supply device's operation.
Implementation Method 1
a magnet disposed to face a motor position sensor for measuring an amount of rotation of the rotary shaft
Data Source
AI summary
Provided is a hydraulic supply device. A hydraulic supply device according to one aspect of the present invention includes a motor which is coupled to a modulator block, in which a path and a valve for adjusting a hydraulic braking pressure are provided, and which includes a stator and a rotor, a rotary shaft which is coupled to the rotor and performs a rotary motion along with the rotor, and a magnet assembly which is coupled to the rotary shaft and includes a magnet disposed to face a motor position sensor for measuring an amount of rotation of the rotary shaft, wherein the magnet assembly may include a shaft, which is coaxially and linearly connected to and rotated along with the rotary shaft and of which one end portion supports the magnet, and a tolerance ring which is mounted on an outer circumferential surface of the shaft and inserted into an installation groove formed in the rotary shaft to fasten the shaft to the rotary shaft, wherein a rotation restriction protrusion for restricting rotation of the tolerance ring around the shaft may be formed on the tolerance ring.