Electro-Mechanical Brake Gear Layout for Durable Integrated Braking
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Solution Overview
Problem
Conventional electro-mechanical brakes face issues with gear durability due to high load, require separate hydraulic systems for parking and service brakes, leading to increased weight and space usage, and suffer from uneven wear and overload when multiple pistons are used.
Innovation Solution
An electro-mechanical brake design featuring a triangular gear arrangement to reduce load on gears, integrating a motor-driven rotating screw with a ball nut and piston system, and a load adjuster to apply uniform force, eliminating the need for hydraulic lines and allowing single-device operation for both parking and service brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gear arrangement is used to transmit motor power to screw or nut, then power transmission is achieved, but the load on gears increases greatly reducing durability
Solution Approach 1:
The patent changes the spatial arrangement of gears from a conventional linear configuration to a triangular configuration. The first gear is driven by the motor, the second gear engages with the first gear, and the third gear engages with the second gear, forming a triangular power transmission path. This dimensional rearrangement distributes the load more evenly across the gear train, reducing the peak load on individual gears and improving overall durability.
2Adaptability or versatility
If separate parking brake and service brake systems are provided, then braking functions are achieved, but vehicle weight and interior space increase
Solution Approach 1:
The patent merges the parking brake and service brake functions into a single integrated electro-mechanical brake system. The motor-driven screw mechanism can provide both continuous braking force (service brake) and sustained holding force (parking brake) through electronic control, eliminating the need for separate hydraulic systems and reducing overall system weight.
Solution Approach 2:
The single electro-mechanical brake system is designed to perform multiple functions: it can operate as a service brake for dynamic braking control and as a parking brake for sustained vehicle holding. The motor controller adjusts the duty cycle and pulse width to provide different braking characteristics as needed, making the system universal for both braking modes.
3Force
If multiple pistons are used for large braking force, then braking capability is improved, but load distribution becomes non-uniform causing uneven wear and motor overload
Solution Approach 1:
The patent divides the braking force generation into multiple segments by using several pistons that are independently actuated by the screw mechanism. Each piston can move and apply brake pad force independently, allowing the system to distribute the total braking load across multiple contact points while maintaining uniform force distribution through the screw's mechanical advantage.
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
Enhances gear durability, reduces weight and space requirements, ensures uniform braking force, and maintains performance even with worn brake pads by using a motor-driven rotating screw and ball nut system with a load adjuster.
Implementation Method 1
the rotational driving force of a motor is transmitted to a screw-nut structure
Implementation Method 2
the rotational driving force of a motor is transmitted to a screw-nut structure to be screwed to press the disc
Implementation Method 3
a brake device is a device for stopping a vehicle from moving during braking or parking, and serves to hold the wheels of the vehicle from rotating
Data Source
AI summary
An electro-mechanical brake and a vehicle including the same are provided. As an electro-mechanical brake according to an aspect of the present invention, an electro-mechanical brake including a pair of brake pads disposed on both sides of a disc, may include a motor that provides a rotational driving force; a rotating screw that rotates about a second rotating shaft parallel to a first rotating shaft of the motor; a power transmission unit that transmits the rotational driving force of the motor to the rotating screw; and a piston that is coupled to the rotating screw to be able to move forward and backward to press the disc with the brake pads.