Bayonet Retainer Ring Deformation for Rotational Alignment

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Solution Overview

Problem

Existing filter head assemblies with bayonet connections face challenges in achieving precise rotational position tolerance, leading to misalignment of open and locked position indicators, which affects the correct operation of the filter system.

Innovation Solution

The implementation of a rotational position tolerance improving retainer ring, made of materials like aluminum, brass, or copper, which deforms under load to allow for precise alignment of the bayonet connection adapter on the filter head, ensuring correct indication of locked and unlocked positions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a rigid retainer ring is used to hold the spring in place, then the structural stability is improved, but the rotational position tolerance deteriorates due to inability to accommodate tolerance variations

Engineering Contradiction:
Improvestructural stabilityVSAvoidrotational position tolerance
Core Design Contradiction:
Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The retainer ring is designed with controlled deformability, allowing it to change its rigid state under assembly torque to accommodate rotational position variations. This parameter change enables the ring to transition from a rigid structure to a slightly deformable one, resolving the contradiction between structural stability and rotational position tolerance.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The retainer ring is designed as a flexible component that can deform elastically under assembly torque. This flexibility allows the ring to accommodate tolerance variations in the bayonet connection while maintaining its function of holding the spring in place, thus resolving the contradiction between rigidity and positional precision.

Inventive Principle:
Principle #30Flexible shells and thin films

2Strength

If high assembly torque is applied to ensure secure connection, then the connection strength is improved, but the rotational position alignment deteriorates due to excessive deformation

Engineering Contradiction:
Improveconnection strengthVSAvoidrotational position alignment
Core Design Contradiction:
StrengthVSManufacturing precision

Solution Approach 1:

The retainer ring's deformability parameter is optimized to allow controlled deformation within a specific torque range. This enables the connection to achieve both sufficient strength and acceptable rotational position alignment, as the ring deforms enough to accommodate alignment variations but not so much as to compromise connection integrity.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The retainer ring is designed to deform partially under assembly torque, allowing just enough deformation to accommodate rotational position variations while maintaining sufficient connection strength. This partial action resolves the contradiction between applying enough torque for strength and avoiding excessive torque that would cause misalignment.

Inventive Principle:
Principle #16Partial or excessive action

3Manufacturing precision

If the retainer ring is made highly deformable to accommodate position variations, then the rotational position tolerance is improved, but the structural stability deteriorates

Engineering Contradiction:
Improverotational position toleranceVSAvoidstructural stability
Core Design Contradiction:
Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

The retainer ring is designed with optimized material properties and geometric parameters that provide controlled deformability. This allows the ring to deform enough to accommodate rotational position variations while maintaining sufficient structural stability to perform its function of holding the spring and securing the bayonet connection.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The retainer ring is designed as a flexible component with optimized thickness and material properties. This flexibility allows it to accommodate position variations while maintaining enough structural integrity to fulfill its stabilizing function, thus resolving the contradiction between deformability and structural stability.

Inventive Principle:
Principle #30Flexible shells and thin films

4Ease of manufacture

If a standard rigid fastening method is used, then the ease of manufacture is improved, but the rotational position precision deteriorates

Engineering Contradiction:
Improvemanufacturing simplicityVSAvoidrotational position precision
Core Design Contradiction:
Ease of manufactureVSManufacturing precision

Solution Approach 1:

The retainer ring is designed as a simple, flexible component that can be manufactured using conventional processes. Its deformability is achieved through optimized geometry and material selection rather than complex mechanisms, maintaining ease of manufacture while improving rotational position precision through controlled deformation during assembly.

Inventive Principle:
Principle #30Flexible shells and thin films

Solution Approach 2:

The retainer ring's geometric parameters (such as thickness, diameter, and cross-section shape) are optimized to provide controlled deformability. This allows the component to be manufactured using standard processes while achieving the desired rotational position precision through parameter optimization rather than complex manufacturing methods.

Inventive Principle:
Principle #35Parameter changes

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 provides a large window of assembly torque, allowing for the necessary deformation of the retainer ring to achieve precise rotational alignment, thereby ensuring accurate operation of the open and locked position indicators on the filter head.

Implementation Method 1

the rotational position tolerance improving retainer ring configured to be further deformable to permit required further rotation beyond the predetermined final assembly torque to align the threaded bayonet connection adapter to a required rotational position

Methodology Applied
Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS12311293B2Filter head assembly having a threaded bayonet connector adapter with a position tolerance improving retainer ring
Publication Date: 2025.05.27 MANN HUMMEL GMBH
  • US12311293B2 patent drawing
  • US12311293B2 patent drawing
  • US12311293B2 patent drawing

AI summary

A filter head assembly includes a filter head and a threaded bayonet connection adapter having a rotational position tolerance improving retainer ring. The rotational position tolerance improving retainer ring providing for and enabling the critical further deformation of the rotational position tolerance improving retainer ring beyond the predetermined final assembly torque to achieve the required critical final rotational position of the threaded bayonet connection adapter for the correct operation of the open and locked position indicators on the filter head.