Electric Brake Layout With Overlapping ECU and Output Gear
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Solution Overview
Problem
The existing electric braking devices with an ECU attached to the housing outside increase in size due to the ECU cover, which extends along the rotation axis of the electric motor.
Innovation Solution
The electric braking device is configured such that the circuit board and electric motor are disposed with a virtual plane parallel to the circuit board intersecting the axial direction of the motor shaft member, and the output gear is positioned to intersect a specific plane through the circuit unit, allowing the circuit unit and output gear to overlap in the axial direction, thereby preventing an increase in size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ECU is attached to the outside of the housing with an ECU cover, then the circuit unit is protected and functional, but the device size increases in the axial direction
Solution Approach 1:
The circuit unit is merged with the transmission mechanism by positioning the output gear to intersect with the circuit unit in the axial direction. This spatial integration allows the circuit unit to be accommodated within the housing without requiring an external ECU cover, thereby maintaining protection while reducing axial device size.
Solution Approach 2:
The circuit unit and output gear are positioned to overlap in the axial direction, utilizing three-dimensional space more efficiently. This dimensional arrangement allows components to occupy the same axial space without interfering with each other's function, reducing the overall axial footprint of the device.
2Length of moving object
If the output gear and circuit unit are positioned to overlap in the axial direction, then the device size is minimized, but the spatial arrangement becomes more complex
Solution Approach 1:
The housing is segmented into different functional zones: the circuit unit accommodated portion and the transmission mechanism portion. This segmentation allows the output gear and circuit unit to overlap in space while maintaining clear functional boundaries and facilitating manufacturing and assembly.
Solution Approach 2:
The circuit unit is nested within the spatial envelope of the transmission mechanism by positioning it to intersect with the output gear in the axial direction. This nesting arrangement allows both components to coexist within the same housing volume without requiring separate external mounting.
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 configuration reduces the size of the electric braking device in the axial direction of the motor shaft member, accommodating the circuit unit within the housing without separate external casing, thus minimizing overall device size.
Implementation Method 1
an electric motor configured to rotate a motor shaft member
Implementation Method 2
generate a braking force on a wheel of a vehicle by pressing the friction material against a rotary body that rotates integrally with the wheel
Data Source
AI summary
An electric braking device includes a transmission mechanism including an input gear configured to input rotation of a motor shaft member and an output gear configured to be rotatable in response to rotation of the input gear and transmit the rotation to an actuator unit. The electric braking device includes a circuit unit including a circuit board and mounting components mounted on the circuit board. In the electric braking device, the circuit board and an electric motor are disposed such that a virtual plane parallel to the circuit board intersects an axial direction of the motor shaft member. In the electric braking device, the output gear is disposed so as to intersect a specific plane P2 that is a plane passing through the circuit unit among virtual planes parallel to the circuit board.