Vehicle Drum Brake Device with Internal Motor Nesting
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Solution Overview
Problem
Conventional drum-type brake devices for vehicles face issues with operation reliability due to the external positioning of the motor, which affects water tightness and requires additional layout, leading to reduced performance during parking braking.
Innovation Solution
A brake device with a driving unit positioned inside the drum, utilizing an electric motor and a nut screw mechanism to spread brake shoes laterally, enhancing water tightness and operation reliability by integrating the motor within the drum structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the motor is positioned outside the drum, then the layout is simpler, but the water tightness deteriorates and the braking performance during parking is reduced
Solution Approach 1:
The motor is nested inside the drum structure, with the motor shaft directly connected to the nut screw mechanism within the drum. This nesting arrangement improves water tightness by eliminating external motor components exposed to water, while maintaining compact layout through space-efficient internal positioning.
2Ease of manufacture
If the motor is positioned outside the drum, then the installation is easier, but the product size increases and braking performance is reduced
Solution Approach 1:
The motor is installed inside the drum cavity, utilizing the existing drum space rather than adding external components. This reduces the overall product volume while maintaining installation feasibility through standardized motor mounting interfaces and modular component assembly.
Solution Approach 2:
The motor is positioned in the axial direction within the drum, utilizing the drum's internal volume along its length. This dimensional arrangement allows compact integration without increasing the drum's radial or lateral dimensions, maintaining efficient space utilization.
3Reliability
If the motor is positioned inside the drum, then the water tightness and braking performance are improved, but the layout complexity increases
Solution Approach 1:
The motor serves multiple functions: providing driving force for the nut screw mechanism, acting as a positioning reference for internal components, and utilizing the drum cavity space efficiently. This multi-functionality reduces the need for separate external mounting structures and simplifies the overall layout.
Solution Approach 2:
The motor housing is merged with the drum structure, eliminating the need for separate external motor mounts and brackets. The motor shaft is directly coupled to the nut screw mechanism, combining power transmission and positioning functions into a unified internal arrangement.
4Volume of moving object
If the motor is positioned inside the drum, then the product size is reduced, but the installation complexity increases
Solution Approach 1:
The brake device is segmented into modular components: the motor assembly, nut screw mechanism, and brake shoe assembly. This segmentation allows each component to be manufactured and tested separately, then assembled together, reducing installation complexity despite the compact internal motor positioning.
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 solution effectively reduces the product size, improves operation reliability, and maintains consistent braking force by spreading brake shoes using the motor's driving force within the drum, ensuring efficient braking and reduced external interference.
Implementation Method 1
a nut screw positioned between first and second brake shoes, and rotated by the rotation power received from the driving unit
Implementation Method 2
an elastic control member having both sides connected to the control lever and the second brake shoe, and pulling the control lever using a preset elastic force
Implementation Method 3
the first brake shoe to come in contact with the drum, or release a braking force while being moved away from the first brake shoe
Data Source
AI summary
A brake device for a vehicle may include: a driving unit positioned in a drum and supplying rotation power; a nut screw positioned between first and second brake shoes; a first push rod having both sides connected to the first brake shoe and the nut screw, and pressurizing the first brake shoe through the rotation of the nut screw; a fixing protrusion fixed to a case surrounding the nut screw; a rotation connection part coupled to the fixing protrusion to restrict rotation of the rotation connection part; a rotation control part inserted into the rotation connection part so as to be screwed to the rotation connection part; and a second push rod having both sides connected to the second brake shoe and the rotation control part, and moved together with the rotation control part in a longitudinal direction so as to pressurize the second brake shoe.