Duo-Servo Drum Brake Actuator Layout for High-Load EPB
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Solution Overview
Problem
Current drum brake devices struggle to provide effective emergency braking and automatic operation for high-load vehicles, as duo-servo drum brakes lack the functions of Electrical Parking Brakes (EPB) and EPB systems face difficulties in applying to high-load vehicles due to limited braking types.
Innovation Solution
A drum brake device with an actuator system that includes a motor part, power transmission part, and push rod mechanism, efficiently disposed to minimize operation force loss and torque loss, allowing for expanded brake shoe distance and maintaining braking force, combining duo-servo drum brake and EPB functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an EPB system is used for emergency braking and automatic operation, then the braking functions are improved, but the system cannot be applied to high-load vehicles due to limited braking force
Solution Approach 1:
The patent combines the EPB actuator mechanism with the duo-servo drum brake structure into an integrated system. The actuator is mounted on the brake assembly and directly drives the brake shoes, merging the electrical control function with the mechanical braking function. This integration allows the system to achieve both the automatic braking capabilities of EPB and the high braking force of duo-servo drums, making it suitable for high-load vehicles.
2Force
If a duo-servo drum brake is used for high-load vehicles, then the braking force is improved, but the system lacks emergency braking and automatic operation functions
Solution Approach 1:
The patent replaces the traditional mechanical linkage system with an electrical actuator system. The actuator uses an electric motor to generate rotational motion, which is then converted to linear motion through a screw mechanism to drive the brake shoes. This substitution introduces automatic control capability while maintaining the high braking force of the duo-servo drum brake structure.
3Area of stationary object
If the actuator parts are densely disposed to save space, then the space availability is improved, but the operation force loss and torque loss increase
Solution Approach 1:
The patent arranges the actuator components in a three-dimensional configuration rather than a linear layout. The motor, gear mechanism, and screw drive are stacked vertically and positioned at different heights and radial distances from the rotation axis. This spatial distribution minimizes interference between components, reduces friction and mechanical losses, while still achieving compact overall dimensions suitable for vehicle installation.
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 minimizes operation force loss and torque loss during braking, enabling effective emergency braking and automatic operation, making it suitable for high-load vehicles by efficiently disposing actuator parts and maintaining expanded brake shoe distance.
Implementation Method 1
a motor part housed in the anchor housing part, and configured to generate a driving force for braking
Implementation Method 2
a power transmission part configured to transmit the driving force generated by the motor part
Implementation Method 3
a push rod part having a length that is varied by the driving force transmitted by the power transmission part
Implementation Method 4
the pair of brake shoes are pressed against a drum to generate a braking force
Data Source
AI summary
A drum brake device for a vehicle includes a first brake shoe and a second brake shoe movably coupled to a back plate, and spaced apart from each other; a wheel cylinder positioned between one end of the first brake shoe and one end of the second brake shoe, and configured to expand the distance between the one end of the first brake shoe and the one end of the second brake shoe; and an actuator positioned between another end of the first brake shoe and another end of the second brake shoe, and configured to provide a driving force to expand the distance between the one end of the first brake shoe and the one end of the second brake shoes and to expand the distance between the another end of the first brake shoe and the another end of the second brake shoe.