Vehicle Latch Power Release With Single-Direction Reset

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Solution Overview

Problem

Existing vehicular door latches require complex motor control circuitry and additional components for the reset function after powered actuation, increasing complexity and cost.

Innovation Solution

A power release mechanism with a unidirectional power release gear and a blocking mechanism that uses a bumper to stop gear rotation without sensors, allowing a single-direction motor operation for both actuation and reset, eliminating the need for reverse direction control and additional components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a motor is actuated in reverse direction to reset the latch mechanism after door release, then the latch can be returned to home position, but additional motor control circuitry and complexity are required

Engineering Contradiction:

Improvelatch reset functionVSAvoidmotor control circuitry

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

Instead of using reverse motor rotation to reset the latch, the patent inverts the approach by using continuous single-direction motor rotation combined with a unidirectional gear mechanism that automatically resets the latch position. The motor rotates in one direction only, and the gear mechanism's inherent mechanical properties handle the reset function without requiring reverse actuation or additional control circuitry.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The latch mechanism performs its own reset function through the mechanical interaction between the unidirectional gear and the motor's continuous rotation. The gear mechanism automatically returns the latch to its home position as a byproduct of the motor's single-direction operation, eliminating the need for separate control systems or additional components to manage the reset sequence.

Inventive Principle:

Principle #25Self-service

2Adaptability or versatility

If additional components are added to enable reset function, then latch functionality is improved, but device complexity and cost increase

Engineering Contradiction:

Improvelatch functionalityVSAvoidlatch mechanism components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The unidirectional gear mechanism serves multiple functions simultaneously: it transmits motor rotation to the latch mechanism, enables the release function, and automatically performs the reset function through its mechanical design. This multi-functionality eliminates the need for separate components dedicated to each function, reducing overall system complexity while maintaining full latch functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the release and reset functions into a single integrated mechanism driven by one motor. The unidirectional gear merges the motor's rotational output with the latch's positional requirements, allowing both release and reset operations to occur through continuous rotation in one direction without requiring separate actuators or control systems.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If complex circuitry and sensors are used to control motor direction, then precise latch control is achieved, but noise sources and cost increase

Engineering Contradiction:

Improvelatch control precisionVSAvoidnoise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces electronic control systems (motors, sensors, circuitry) with a purely mechanical solution. The unidirectional gear mechanism uses mechanical constraints and motion transmission to achieve precise latch control without requiring electronic sensing or directional control signals. This mechanical approach eliminates electromagnetic noise and reduces the number of electronic components in the system.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Reduces complexity and cost by minimizing the size and weight of the latch assembly while eliminating noise sources and unnecessary motor control circuitry, enhancing design flexibility.

Implementation Method 1

the blocking mechanism is biased from the blocking position toward the unblocking position by a spring

Methodology Applied

Scientific EffectSpring: Spring

Data Source

PatentUS20250369263A1Vehicle latch having unidirectional power release function

Publication Date: 2025.12.04 MAGNA CLOSURES INC

AI summary

A latch assembly for a closure member of a motor vehicle, including a ratchet and pawl assembly and a power release mechanism having a power release gear movable by a motor in a single direction to actuate the ratchet and pawl assembly, with a blocking mechanism movable in response to movement of the power release gear between a blocking position, whereat rotation of power release gear is impeded, and an unblocking position, whereat rotation of the power gear is permitted.