Electro-mechanical Brake Compact Power Transmission Layout
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Solution Overview
Problem
Conventional electro-mechanical brakes face issues with durability due to the load applied by rotational forces through a series of gears, leading to structural inefficiencies and increased volume, making them less suitable for compact designs and autonomous driving systems.
Innovation Solution
A compact electro-mechanical brake design featuring a power transmission part with a driving motor, a rotating shaft, a screw driving part, and a nut driving part, where the screw driving part is engaged with the nut driving part to transmit power, and a bearing member is used to reduce rotational friction, allowing for a more compact and efficient structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gears are disposed in a row to transmit power from motor to screw/nut, then power transmission is achieved, but load due to rotational force is applied greatly degrading durability
Solution Approach 1:
The patent changes the spatial arrangement of power transmission components from a linear row configuration to a multi-dimensional layout where gears are positioned at different levels and angles. The screw or nut is disposed at a different position relative to the motor, and intermediate gears connect them through a three-dimensional path, distributing the rotational load more effectively across multiple axes and reducing stress concentration on individual components.
2Ease of operation
If conventional EMB structure supports clamp force on bottom surface of caliper housing bore, then braking function is achieved, but product length in axial direction increases making mounting difficult
Solution Approach 1:
The patent repositions the support structure from the bottom surface of the caliper housing bore to the side surface or top surface, utilizing a different spatial dimension for force transmission. This allows the axial length to be reduced while maintaining the clamp force support function through lateral or vertical load paths instead of axial compression.
Solution Approach 2:
The patent integrates the support function into the caliper housing structure itself rather than requiring a separate bottom support component. The housing is designed to directly support the clamp force through its side or top surface, merging the structural support function with the housing and eliminating the need for additional axial space.
3Reliability
If conventional EMB structure supports clamp force on bottom surface of caliper housing bore, then braking function is achieved, but inner spindle receives bending stress reducing efficiency and strength
Solution Approach 1:
The patent changes the load path from vertical compression through the bottom surface to a lateral or angled load path through the side or top surface. This dimensional change in force transmission prevents the development of bending moments in the inner spindle, as the clamp force is transmitted through a more direct axial path or through the housing structure rather than creating eccentric loading conditions.
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 design enhances durability and reduces the overall volume of the brake system, improving efficiency and strength by minimizing the load on the power transmission components and optimizing spatial utilization.
Implementation Method 1
a bearing member is used to reduce rotational friction
Data Source
AI summary
Disclosed is an electro-mechanical brake which is compact due to a changed structure of a power transmission part. According to one aspect of the present invention, there is provided an electro-mechanical brake provided with a pair of brake pads disposed at both sides of a disc, the electro-mechanical brake including a driving motor, a first rotating part assembled with a rotating shaft of the driving motor, a second rotating part driven while connected to the first rotating part through a driving transmission member, a nut driving part rotationally driven while connected to the second rotating part so that power is transmitted to the second rotating part, and a screw driving part which is installed inside and engaged with the nut driving part and driven forward or backward according to a rotation direction of the nut driving part so that a piston pushes the brake pads to come into close contact with the disc, wherein one end of the screw driving part is assembled with the piston, the other end of the screw driving part passes through the driving transmission member and is disposed between the first rotating part and the second rotating part to move forward or backward.