Drum Brake Reduction Gearbox With Conformable Stepped Gears
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Solution Overview
Problem
The existing geared motor assemblies for drum brake shoe actuation are too large to fit in the limited and varying spaces available in different vehicle models, due to their rigid design and parallel arrangement of axes, which restricts their adaptability and integration.
Innovation Solution
A geared motor with an externally contacting gear train comprising stepped gears that can be arranged in various shapes, such as rectilinear, curved, or S-shapes, allowing for a compact and adaptable design. This includes a reduction gearbox with tangentially meshing stepped gears and an angle transmission, enabling the motor to be integrated into diverse vehicle wheel spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a reduction module with parallel axes is used to reduce motor speed and increase torque, then the torque output is sufficient for brake actuation, but the overall size of the geared motor becomes too large to fit in limited wheel spaces
Solution Approach 1:
The patent applies nesting by placing the pinion inside the toothed wheel, with the pinion shaft passing through the center of the toothed wheel. This nested configuration allows both gears to occupy overlapping spatial volumes, significantly reducing the overall footprint of the reduction module while maintaining the necessary torque multiplication through the parallel axis arrangement.
2Reliability
If a rigid design with fixed parallel axes is used for the reduction module, then the mechanical transmission is simple and reliable, but the adaptability to different vehicle wheel spaces is reduced
Solution Approach 1:
The patent implements dynamics by making the position of the toothed wheel adjustable relative to the pinion along the common parallel axis. The toothed wheel can be positioned at different locations along the pinion shaft, allowing the reduction module to adapt to various spatial constraints in different vehicle models while maintaining the reliable parallel axis mechanical transmission. This dynamic positioning capability enables the same basic design to be adapted to multiple applications.
3Speed
If the motor axis is arranged parallel to the planetary gear axes, then the speed reduction is effective, but the resulting configuration increases the overall size of the geared motor
Solution Approach 1:
The patent applies nesting by placing the pinion inside the toothed wheel, with the pinion shaft passing through the center of the toothed wheel. This nested configuration allows both gears to occupy overlapping spatial volumes, significantly reducing the overall footprint of the reduction module while maintaining the necessary torque multiplication through the parallel axis arrangement.
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 compact and adaptable design of the geared motor allows for efficient integration into different vehicle models, reducing the overall size and enhancing the flexibility of the motor's shape to fit various wheel spaces while maintaining effective operation.
Implementation Method 1
A geared motor with an externally contacting gear train comprising stepped gears that can be arranged in various shapes
Implementation Method 2
reduction gearbox with tangentially meshing stepped gears and an angle transmission, enabling the motor to be integrated into diverse vehicle wheel spaces
Data Source
AI summary
A reduction motor for a parking brake mechanical actuator of a drum brake comprising an electric motor comprising an output shaft extending along a first axis, and a reduction gearbox comprising an output shaft extending along a second axis, in which the reduction gearbox, comprises stepped tangentially-meshing spur gears, each stepped gear comprising a gearwheel and a coaxial pinion, these being superposed on and secured to each other in terms of rotation, the stepped gears being mounted with the ability to rotate about mutually parallel axes.