Compact Brake Device with Inverted Screw and Material Guide
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Solution Overview
Problem
Brake devices face challenges in compactness due to large bearing diameters and axial lengths, leading to increased size and reduced durability, particularly when using male and female screws for motion conversion and coupling mechanisms.
Innovation Solution
A brake device configuration featuring a motor with a rotating output shaft, a motion conversion mechanism with a male screw and female screw, an actuating member, and a guide member made of a different material, which reduces the bearing diameter, shortens the actuator length, and minimizes sliding resistance, allowing for a more compact design and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the linear motion member having a male screw linearly moves according to the rotation of a rotation member having a female screw, then the motion conversion is achieved, but the diameter of the bearing becomes large, resulting in increase in size of the brake device
Solution Approach 1:
The patent inverts the traditional male-female screw configuration by making the rotation member have a male screw and the linear motion member have a female screw. This inversion allows the linear motion member to be positioned more centrally, reducing the bearing diameter and overall brake device size while maintaining effective motion conversion functionality
2Power
If the output shaft of a motor or a member that rotates in conjunction with the output shaft is coupled to an axial end face of the rotation member, then the power transmission is achieved, but the size of the brake device becomes large in an axial direction
Solution Approach 1:
The patent changes the coupling arrangement from axial end-face coupling to radial coupling. The output shaft or its rotating member is coupled to the radial outer periphery of the rotation member, which allows power transmission while significantly reducing the axial length of the brake device
3Force
If the male screw and the female screw mesh with each other on the braking member side, then the actuation force is transmitted, but a relatively large portion for accommodating the driven part is needed, resulting in less compact configuration
Solution Approach 1:
The patent inverts the screw meshing position from the braking member side to the side opposite the braking member. This allows the driven part to be positioned closer to the braking member, reducing the accommodation space required and achieving a more compact brake device configuration
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 configuration results in a more compact brake device with enhanced durability and reduced vibration energy, as the smaller bearing diameter and guide member reduce sliding resistance and wear, while allowing for closer placement of components, thus optimizing in-vehicle space and performance.
Implementation Method 1
a motion conversion mechanism including a rotation member that includes a male screw and rotates about an axis center of the male screw, and a linear motion member that includes a female screw that meshes with the male screw and linearly moves
Implementation Method 2
the guide member is made of a material different from that of the rotation member and slidably guides the actuating member in the axial direction
Data Source
AI summary
A motion conversion mechanism of a brake device includes a rotation member and a linear motion member that linearly moves accompanying the rotation of the rotation member. The rotation member is rotationally driven through a third gear. A male screw and a female screw mesh with each other on the side opposite to the brake shoe of the third gear, where one end of an actuating member receives a force for actuating the brake shoe from the linear motion member, and the other end actuates the brake shoe. The guide member that guides the actuating member is made of a material different from that of the rotation member, and slidably guides the actuating member in the axial direction.