Electronic Brake Rotation Limit Unit Design

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Solution Overview

Problem

Conventional parking brakes require high force to operate, leading to driver strain and limited indoor space usage, and struggle to maintain the parking brake state under external impacts or power loss, resulting in potential vehicle movement.

Innovation Solution

An electronic brake system with a rotation limit unit that includes a spindle, a nut, and a drive unit, where the rotation limit unit is connected to the spindle to prevent rotation and maintain braking force, using a binder and stepped portions to ensure reliable braking without concentrating rotational force on the drive unit.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a conventional parking brake lever is positioned at the center of a console, then the brake can be operated, but the use of indoor space is limited and high force is required causing driver strain

Engineering Contradiction:

Improvedriver strainVSAvoidindoor space

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The patent replaces the conventional mechanical lever-based parking brake system with an electronic brake system that uses an actuator to generate braking force. This substitution eliminates the need for a manual lever, reducing driver strain while freeing up console space for other interior design elements.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating mechanism from mechanical force application to electronic signal-based actuation. The actuator converts electrical energy into mechanical motion, fundamentally changing how the parking brake is activated and maintained, thereby reducing the physical effort required by the driver.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the parking brake relies solely on friction between pad and disk, then the configuration is simple, but the parking brake state is released under external impact or power loss causing vehicle movement

Engineering Contradiction:

Improveparking brake maintenanceVSAvoidbrake system configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a rotation limit unit that proactively prevents spindle rotation before vehicle movement can occur. This preliminary action ensures that even under external impacts or power loss conditions, the parking brake state is maintained by physically limiting the spindle's rotational capability rather than relying solely on friction forces.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The rotation limit unit acts as a preventive measure against potential parking brake failure. By limiting spindle rotation capability in advance, the system cushions against the harmful effects of external impacts or power loss that would otherwise cause the vehicle to move.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If the rotation limit unit is connected to the spindle to prevent rotation, then braking reliability is improved, but rotational force concentrates on the drive unit causing potential failure

Engineering Contradiction:

Improvebraking reliabilityVSAvoiddrive unit durability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent introduces a binder as an intermediary element between the rotation limit unit and the spindle. This binder transmits the rotational limiting force separately from the drive unit, preventing concentration of stress on the drive unit while maintaining the reliability benefits of rotation limitation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the force transmission path by separating the rotation limiting function from the drive unit through the introduction of the binder. This segmentation allows the rotational force to be distributed through different structural paths, reducing the stress burden on the drive unit while maintaining braking reliability.

Inventive Principle:

Principle #1Segmentation

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 limits spindle rotation, maintains braking force, and reduces current consumption, enhancing braking reliability and space utilization while preventing vehicle movement during parking.

Implementation Method 1

a binder provided on the body to come into close contact with or be separated from the stepped portion

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20230132084A1Electronic brake system, vehicle including the same, and method of operating the same

Publication Date: 2023.04.27 HL MANDO CORP

AI summary

An electronic brake system is disclosed. According to one aspect of the present disclosure, there may be provided an electronic brake system including a piston provided in a caliper housing to press a pad plate, a nut coupled to the inside of the piston to move the piston forward or backward, a spindle configured to move the nut forward or backward by rotation and including a stepped portion formed on an outer surface thereof, a rotation limit unit connected to or disconnected from the spindle to allow or block the rotation of the spindle, and a drive unit configured to move the rotation limit unit to a position at which the rotation of the spindle is allowed or blocked, wherein the rotation limit unit includes a body surrounding an outer circumferential surface of the spindle, a binder provided on the body and provided to come into close contact with the stepped portion, and a connector provided on the body and configured to receive a driving force from the drive unit.