Electromechanical Brake Wear Compensation With Nested Piston Positioning
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Solution Overview
Problem
Conventional electromechanical brake systems face issues with increased size and reduced usability due to brake pad wear, necessitating compensation mechanisms that often compromise vehicle performance and efficiency.
Innovation Solution
An electromechanical brake system with a power conversion unit and positioning portion that adjusts the relative position of the piston using a drive motor, incorporating interlocking screws and gears to compensate for brake pad wear while maintaining braking performance, reducing size and weight, and enhancing space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake pad wear compensation is implemented by increasing the axial length of the brake system, then braking performance is maintained, but the size of the brake system increases and vehicle usability deteriorates
Solution Approach 1:
The patent implements a dynamic compensation mechanism where the piston's axial position is automatically adjusted based on brake pad wear. The positioning portion allows the piston to move axially relative to the caliper body, compensating for pad thickness reduction without increasing the overall brake system length. This dynamic adjustment maintains braking performance while avoiding the size increase problem.
Solution Approach 2:
The positioning portion is integrated within the existing caliper structure, with the piston positioned inside the caliper body and the adjustment mechanism nested within the confined space. This nesting approach enables wear compensation functionality without adding external components that would increase the brake system's axial length.
2Reliability
If a complex wear compensation mechanism is added to maintain braking performance, then reliability is improved, but device complexity increases
Solution Approach 1:
The positioning portion serves multiple functions: it enables wear compensation, maintains piston positioning accuracy, and integrates with the existing braking mechanism. By combining these functions into a single integrated component rather than adding separate mechanisms, the patent improves reliability without proportionally increasing device complexity.
Solution Approach 2:
The system automatically compensates for brake pad wear through the drive motor actuating the positioning portion to adjust piston position, eliminating the need for manual intervention or complex sensing systems. This self-service approach maintains braking performance while keeping the control system relatively simple.
3Adaptability or versatility
If the electric length and stroke distance are reduced to improve vehicle applicability, then space utilization is improved, but the braking force transmission capability may be compromised
Solution Approach 1:
The patent replaces traditional long-stroke mechanical braking mechanisms with a compact electromechanical system using a drive motor and precision positioning mechanism. This substitution achieves sufficient braking force transmission with reduced electric length and stroke distance, improving space utilization and vehicle applicability without compromising force transmission capability.
Solution Approach 2:
The system optimizes the stroke distance and electric length parameters by implementing precise piston positioning control. Through controlled adjustment of the piston's axial position and optimized gear ratios in the positioning portion, the patent achieves effective braking force transmission with shortened stroke distances, enabling better integration into various vehicle platforms.
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 system effectively maintains braking performance by compensating for brake pad wear, reduces electric length and stroke distance, and improves vehicle applicability through a simple structure.
Implementation Method 1
the positioning portion includes a first screw provided on an outer surface of one side of the nut and having, on an outer peripheral surface, a first thread that meshes with the thread
Implementation Method 2
a second gear provided on a motor shaft of the drive motor and meshing with the first gear
Implementation Method 3
a first return spring inserted into the receiving groove, one end of which is supported by the first or second screw
Data Source
AI summary
An electromechanical brake and an operating method thereof are disclosed. According to an aspect of the present disclosure, there may be provided an electromechanical brake including: a piston which is provided to be capable of advancing and retreating to press a pad plate; a power conversion unit including a spindle which rotates by receiving a driving force from an actuator, and a nut which is connected to the spindle and advances or retreats by rotation of the spindle in a first direction or a second direction; and a positioning portion which is screwed with a thread formed inside the piston, receives a rotational force from a drive motor, linearly moves according to rotational movement, and adjusts a relative position of the piston with respect to the power conversion unit, wherein the positioning portion includes a first screw provided on an outer surface of one side of the nut and having, on an outer peripheral surface, a first thread that meshes with the thread, a second screw provided on an outer side surface of the other side of the nut and having, on an outer peripheral surface, a second thread that meshes with the thread, a first gear provided to rotate together with the second screw by receiving the rotational force from the drive motor, and an interlocking member provided between the first screw and the second screws to interlock and linearly move the first and second screws by the rotation of either the first screw or the second screw and adjust a relative position with the piston.