Elastic Blocking Means for Rotor Stator Locking

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Solution Overview

Problem

The existing clipping arrangement for locking a rotor in a stator requires a manual thrust force to elastically deform metal wire pins, resulting in insufficient resistance to tearing due to the small size of the pins and play between the stator and rotor components.

Innovation Solution

A method using an elastic locking means, such as a circular or square section rod or a circlip, which allows for a smaller continuous thrust force and higher resistance to tearing, involving a two-part rotor design with an elastic blocking mechanism and a trigger system for easy assembly and secure locking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a metal wire pin is used for clipping the rotor in the stator, then the locking mechanism can be assembled, but the resistance to tearing is insufficient due to the small size of the pin and play between components

Engineering Contradiction:

Improveresistance to tearingVSAvoidclipping arrangement complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent changes the physical state and properties of the blocking means from a rigid metal wire pin to an elastic blocking means that can be deformed. This elastic material allows for a more massive and tearing-resistant structure while enabling controlled deformation during assembly through the frustoconical surface mechanism

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The rotor is divided into two independent parts: a front part (barrel) and a rear part. This segmentation allows the elastic blocking means to be constrained in the rear part before assembly, then released to engage with the stator groove, separating the assembly function from the final locking function

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If a manual thrust force is applied to deform the pin branches during assembly, then the clipping can be achieved, but the assembly process requires jerky manual force application

Engineering Contradiction:

Improveassembly easeVSAvoidassembly operation smoothness

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent introduces a dynamic element - the elastic blocking means - that changes its mechanical properties during assembly. The frustoconical surface provides a progressive deformation mechanism that converts a single jerky manual force into a continuous, controlled elastic deformation process, making the assembly operation smoother and more predictable

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The elastic blocking means is preliminarily constrained in a groove of the rotor rear part before assembly. This preliminary constraint allows the blocking means to be prepared in advance, and during assembly, it is automatically released and deformed by the frustoconical surface without requiring complex manual manipulation during the critical clipping moment

Inventive Principle:

Principle #10Preliminary action

3Strength

If a more massive elastic blocking means is used to increase tearing resistance, then the strength improves, but the manual introduction of the rotor becomes more difficult

Engineering Contradiction:

Improveresistance to tearingVSAvoidrotor introduction ease

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The elastic blocking means is preliminarily constrained in a compressed state within a groove of the rotor rear part. This preliminary constraint reduces its effective size and stiffness during the introduction phase, allowing easy manual insertion. Once positioned, the constraint is released and the blocking means expands to its full massive form to provide high tearing resistance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses the dynamic property of elastic deformation to reconcile the contradiction between massiveness and ease of introduction. The blocking means transitions from a compressed, easily inserted state to an expanded, high-strength state. The frustoconical surface acts as a controlled release mechanism that transforms the insertion force into the expansion force, making the process smooth rather than jerky

Inventive Principle:

Principle #15Dynamics

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 solution enables easier and more secure locking of the rotor in the stator with improved resistance to tearing, allowing for reliable operation and enhanced durability of the locking mechanism.

Implementation Method 1

a constrained elastic blocking means is released in elastic radial expansion in a groove arranged opposite said screw in the stator

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP1842987B1Method of blocking a translation movement by clipping a rotor in a lock stator and rotor front part

Publication Date: 2010.06.16 VALEO SECURITE HABITACLE

Figure 1~2
Figure 3~4
Figure 5~6

AI summary

The method involves housing an open snap ring (2) in an annular groove of a stator (4) by a retaining part (3A) of a trigger (3). The snap ring is released by elastic deformation in another annular groove of a cylinder of a rotor (5) by pushing the retaining part in the direction of a longitudinal axis of the stator when the snap ring is in opposite to the latter annular groove. Independent claims are also included for the following: (1) a front part or rotor cylinder for implementing a rotor blocking method (2) a rotor rear part cooperating with a rotor front part (3) a lock comprising a stator.