Motor Vehicle Lock Coupling Lever With Bidirectional Slotted Link

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Existing motor vehicle locks, particularly door locks, suffer from complex movements of the coupling lever and its pin within the slotted link, leading to potential disruptions and malfunctions.

Innovation Solution

The design incorporates a bidirectional slotted link for the coupling lever, with separate first and second paths for the positioning lever's pin, stabilized by separation and evasive stops, and equipped with a center-zero spring and return spring, allowing stable end positions and preventing malfunctions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional slotted link is used for the coupling lever, then the coupling lever can be actuated, but complex movement paths lead to disruptions and malfunctions

Engineering Contradiction:
Improvefunctional reliabilityVSAvoidmovement complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The slotted link is divided into two separate, spatially distinct paths (first path and second path) for the pin to follow. This segmentation of the movement trajectory eliminates complex intertwined motion patterns and prevents malfunctions by ensuring each path is dedicated and predictable.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Separation stops and evasive stops are introduced as intermediary elements that guide and constrain the pin's movement. These stops act as mediators that prevent the pin from deviating from the intended paths, thereby avoiding disruptions while maintaining reliable operation.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Ease of operation

If the coupling lever is made pivotable on an actuating lever, then the locking mechanism can be actuated, but the complex pin movement inside the slotted link causes disruptions

Engineering Contradiction:
Improveactuating capabilityVSAvoidoperational reliability
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

The actuation process is segmented into two distinct operational modes corresponding to the two separate paths. The first path handles normal actuation operations, while the second path provides an alternative reliable path that avoids the disruption-prone complex movements of the conventional single-path design.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Instead of having a single complex path that the pin must navigate, the invention inverts the approach by providing two simple, separate paths. The pin can choose either path depending on the operational state, thereby avoiding the inherent problems of complex single-path navigation.

Inventive Principle:
Principle #13The other way round (Inversion)

3Reliability

If separation stops and evasive stops are added to the slotted link, then malfunctions are prevented, but the device structure becomes more complex

Engineering Contradiction:
Improvefunctional reliabilityVSAvoidstructural complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The problematic complex movement behavior is extracted and removed from the system by implementing separate dedicated paths. The separation stops and evasive stops are minimal structural additions that extract the malfunction potential from the system without requiring complete redesign of the entire mechanism.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The separation stops and evasive stops are designed to automatically guide the pin along the correct path without requiring external control mechanisms. The structure itself provides the guidance and prevention functions, making the system self-regulating and reducing the need for additional complex control elements.

Inventive Principle:
Principle #25Self-service

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 ensures stable and reliable operation by preventing disruptions, maintaining functional reliability and avoiding malfunctions, while allowing electromotive or manual control of the locking mechanism.

Implementation Method 1

center-zero spring

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

return spring

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentUS20260085552A1Motor vehicle lock
Publication Date: 2026.03.26 KIEKERT AG
  • US20260085552A1 patent drawing
  • US20260085552A1 patent drawing
  • US20260085552A1 patent drawing

AI summary

The invention relates to a motor vehicle lock, in particular a motor vehicle door lock, which is equipped with a locking mechanism substantially comprising a rotary latch (1) and a pawl (2). Moreover, an actuating lever chain (4, 5, 9) acting on the locking mechanism (1, 2) is provided with a coupling lever (9), wherein the coupling lever (9), when engaged, closes the actuating lever chain (4, 5, 9) in order to actuate the lock (1, 2) and opens it when disengaged. The coupling lever (9) interacts with a positioning lever (5), which controls the coupling lever, in order to change between at least two stable end positions, “engaged” and “disengaged”. According to the invention, the positioning lever (5) engages, with a pin (7), in a bidirectional slotted link (8) of the coupling lever (9). The bidirectional slotted link (8) is designed in such a way that, when the positioning lever (5) is acted upon, the pin (7) reaches its first end position along a first path (11) and its second end position along a second path (12) separate therefrom.