Electromechanical Drum Brake With Integrated Force-Sensing Screw Actuation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electro-mechanical drum brakes face challenges in miniaturization due to increased complexity and size limitations from added components for precise control.
Innovation Solution
The drum brake incorporates a motor, pressing units, and a power transmission unit with a rotational member and rotational screw, along with a force sensor and control unit, to enable precise control and miniaturization by space-intensive placement of internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If components are added for precise control in electro-mechanical drum brake, then control precision is improved, but device complexity increases and volume reduction is limited
Solution Approach 1:
The patent combines the force sensor, pressing member, and rotational screw into an integrated assembly where the force sensor is disposed between the rotational screw and the pressing member. This merging of components achieves precise force measurement while avoiding the complexity of separate control systems.
Solution Approach 2:
The pressing member serves multiple functions: it transmits axial force from the rotational screw to press the brake shoe, and simultaneously provides a mounting structure for the force sensor. This multi-functionality reduces the number of separate components needed for precise control.
2Measurement precision
If components are added for precise control in electro-mechanical drum brake, then control precision is improved, but volume reduction is limited
Solution Approach 1:
The force sensor is nested within the pressing member structure, specifically disposed between the rotational screw and the pressing member. This nesting arrangement allows precise measurement functionality to be incorporated without significantly increasing the overall brake volume.
Solution Approach 2:
The pressing member is designed with an accommodation space in its longitudinal direction, allowing the force sensor to be positioned in a different dimensional orientation rather than increasing the radial or axial dimensions of the brake assembly.
3Volume of stationary object
If space-intensive placement of components is implemented, then brake volume is reduced, but ease of manufacture decreases
Solution Approach 1:
The pressing member is segmented into functional zones: the accommodation space for the force sensor, the force transmission path from the rotational screw, and the brake shoe contact surface. This segmentation allows each component to be manufactured and assembled independently while maintaining compact overall dimensions.
Solution Approach 2:
The force sensor is pre-positioned within the accommodation space of the pressing member before final assembly with the rotational screw and brake shoe. This preliminary placement simplifies the manufacturing process by avoiding complex post-assembly adjustments.
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
This configuration allows for precise control of the brake, measurement of force applied to the brake shoe, and miniaturization of the brake system, enhancing assemblability and economics while reducing volume.
Implementation Method 1
a rotational screw which is coupled to the rotational member, and advances and retreats onto the inner peripheral surface of the drum
Implementation Method 2
a force sensor disposed between the rotational screw and the first pressing member, and measuring force pressed to the first pressing member
Implementation Method 3
a motor providing rotational driving force
Data Source
AI summary
A drum brake includes: a motor providing rotational driving force; a pair of pressing units pressing a pair of brake shoes onto an inner peripheral surface of a drum; and a power transmission unit transmitting the rotational driving force of the motor to the pressing unit, and the power transmission unit includes a rotational member which rotates by receiving the rotational driving force of the motor, and a rotational screw which is coupled to the rotational member, and advances and retreats onto the inner peripheral surface of the drum.