Disc Brake Motor Gear Unit With Shared Shaft Power Distribution
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Solution Overview
Problem
Existing motor gear units for disc brake apparatuses face challenges in maintaining accurate coaxiality between the first and second output members, leading to inappropriate meshing, operational issues, and increased assembly complexity.
Innovation Solution
The proposed motor gear unit incorporates a power distribution mechanism with a support shaft and a gear train that includes a first and second output member, an input carrier, and intermediate gears, which are supported by a housing and designed to improve coaxiality through precise alignment and rotation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a power distribution mechanism with multiple output members is used to drive multiple pistons, then the braking force is increased, but the coaxiality between output members becomes difficult to maintain
Solution Approach 1:
The patent merges the support functions for multiple output members into a single integrated support shaft. The first and second output members are both supported by this common shaft, ensuring they share the same rotational axis. This combining approach maintains coaxiality while enabling the mechanism to drive multiple pistons simultaneously to generate increased braking force.
Solution Approach 2:
The support shaft acts as an intermediary element between the power distribution mechanism and the multiple output members. It mediates the transmission of rotational motion while maintaining precise coaxial alignment, solving the problem of how to drive multiple pistons without compromising the coaxiality of the output members.
2Stability of the object's composition
If the power distribution mechanism is supported by the housing, then the structural stability is improved, but the assembly complexity increases
Solution Approach 1:
The patent combines multiple support functions into a single integrated support shaft that supports both the first and second output members. This unified structure is then supported by the housing as one complete assembly, reducing the number of separate support components and simplifying the overall assembly process while maintaining structural stability.
Solution Approach 2:
The power distribution mechanism is designed as a modular assembly that can be supported by the housing as a complete unit. The support shaft and output members form an integrated subsystem that can be assembled and installed together, reducing assembly complexity compared to supporting each component separately.
3Reliability
If the output members are rotatably supported to allow smooth operation, then the operational reliability is improved, but the risk of inappropriate meshing increases
Solution Approach 1:
The support shaft serves as a precise intermediary that maintains fixed coaxial relationships between the first and second output members. By supporting both members on the same shaft with defined rotational positions, the system ensures accurate meshing of the intermediate gears while still allowing the output members to rotate smoothly for reliable operation.
Solution Approach 2:
The patent applies different rotational characteristics to different parts of the system. The support shaft provides fixed, precise rotational positioning for accurate meshing, while the output members are designed to rotate freely on this shaft for smooth operation. This local differentiation of rotational qualities resolves the contradiction between reliable operation and accurate meshing.
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 enhances coaxiality between the output members, ensuring proper meshing and operation, simplifying assembly, and preventing abnormal sounds, thereby improving the mechanical efficiency and reliability of the disc brake apparatus.
Implementation Method 1
The gear train includes a first output member and a second output member which are rotatably supported by the support shaft in a state of being separated from each other in an axial direction of the support shaft
Data Source
AI summary
A motor gear unit for a disc brake apparatus includes an electric motor, a speed reduction mechanism configured to transmit rotation of the electric motor to a plurality of rotary-to-linear motion conversion mechanisms arranged in a plurality of cylinders provided in a caliper, and a housing accommodating the electric motor and the speed reduction mechanism. The speed reduction mechanism includes a plurality of final gears connected directly or via another member to the plurality of rotary-to-linear motion conversion mechanisms and a power distribution mechanism that includes one support shaft and that is configured to distribute and transmit input power to the plurality of final gears. The power distribution mechanism is supported by the housing by supporting and fixing end portions of the support shaft on axially both sides to the housing.