Vehicle Electric Braking Device Sensor Circuit Board Integration
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Solution Overview
Problem
Existing electric braking devices for vehicles face challenges in downsizing and achieving better mountability due to their configuration, which makes it difficult to accommodate them within a tire wheel without interfering with suspension members and requires a compact design.
Innovation Solution
The electric braking device incorporates an electric motor, a rotation angle sensor, and a pressing force sensor, with a circuit board that includes a microprocessor and bridge circuit to drive the motor based on detected rotation and pressing force data, allowing for a reduced motor size and improved mountability by fixing the sensors to the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electric braking device uses a conventional configuration with sensors connected via terminal sensors from the outer periphery of a reduction gear, then the sensor connection is achieved, but the radial size of the electric motor cannot be reduced
Solution Approach 1:
The patent changes the connection dimension from radial (outer periphery) to axial (end face direction). The rotation angle sensor is moved from the outer periphery of the reduction gear to the end face side of the electric circuit unit, where it connects to the circuit board via a connector. This dimensional shift allows the electric motor to be downsized radially while maintaining sensor functionality.
2Adaptability or versatility
If the electric braking device is designed to be compact for wheel accommodation, then mountability improves, but the device complexity increases due to integrated sensor and circuit board arrangements
Solution Approach 1:
The patent merges the sensor and circuit board into an integrated assembly. The rotation angle sensor and pressing force sensor are mounted on the circuit board, which is then integrated into the electric circuit unit. This consolidation reduces the overall device footprint for better wheel accommodation while managing complexity through systematic integration rather than scattered components.
Solution Approach 2:
The circuit board serves multiple functions: it provides electrical connections for the electric motor, houses the rotation angle sensor, mounts the pressing force sensor, and integrates the connector for external connections. This multi-functionality reduces the need for separate components, enabling a more compact design that maintains all necessary functions.
3Reliability
If the circuit board is securely fixed to the caliper, then vibration durability improves, but the fixation structure becomes more complex
Solution Approach 1:
The circuit board is integrated with the electric circuit unit housing, forming a unified assembly that is then mounted to the caliper. This merging of the circuit board with the housing structure eliminates the need for separate fixation mechanisms, providing vibration durability through the rigid integrated structure while avoiding additional complexity from separate mounting components.
Data Source
AI summary
This electric braking device is provided with: an electric motor MTR that, in accordance with an operation amount Bpa of a braking operation member BP, generates a pressing force Fba, being a force pressing a friction member MSB against a rotary member KTB that rotates integrally with a wheel WHL of the vehicle; and a circuit board KBN to which a processor MPR and a bridge circuit BRG are mounted. The device is further provided with a rotation angle sensor MKA for detecting the rotation angle Mka of the electric motor, and drives the electric motor MTR on the basis of the rotation angle Mka. An end face Mmk of the rotation angle sensor MKA is fixed so as to be in contact with the circuit board KBN. The device is further provided with a pressing force sensor FBA for detecting the pressing force Fba, and drives the electric motor MTR on the basis of the pressing force Fba. An end face Mfb of the pressing force sensor FBA is fixed so as to be in contact with the circuit board KBN.