Press-Fit Structure Using Material Flow for Stable Assembly

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing press-fit structures and methods often result in unstable assemblies due to structural design, leading to loose couplings when fasteners are used.

Innovation Solution

A press-fit structure and method that includes a body with a pressurizing portion, material storage space, restricting portion, and limit stop portion, where the pressurizing portion applies pressure to cause material flow into the storage space, and the restricting and limit stop portions ensure stable assembly by restricting the object's direction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fastener is used for coupling objects, then the coupling function is achieved, but the assembly becomes unstable and may become loose

Engineering Contradiction:

Improveassembly stabilityVSAvoidfastener structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the fastener component entirely and replaces it with a press-fit structure that relies on interference fit and material deformation. The coupling is achieved through the pressurizing portion deforming the object's material into the material storage space, eliminating the need for separate fasteners and their associated complexity while improving assembly stability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical fastening system (screws, bolts, clips) with a press-fit mechanism based on elastic deformation and interference fit. The pressurizing portion applies force to deform material into the storage space, creating a secure mechanical interlock without requiring traditional fasteners, thus reducing device complexity while maintaining reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If material is pressed into the storage space to secure the object, then assembly stability is improved, but the risk of over-pressurization and damage increases

Engineering Contradiction:

Improveassembly stabilityVSAvoidover-pressurization damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent designs the material storage space with predetermined dimensions and the pressurizing portion with controlled geometry to limit the amount of material deformation. The structure is pre-configured to stop material flow into the storage space once a certain compression level is reached, preventing over-pressurization before it can cause damage while still achieving sufficient assembly stability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The material storage space acts as an intermediary chamber that receives and contains the deformed material. This intermediary structure controls the deformation process by providing a defined volume that limits how far material can be pressed, thereby mediating between the pressurizing force and the object to prevent harmful over-pressurization while maintaining secure assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the pressurizing portion is designed to flow material into the storage space, then secure coupling is achieved, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvecoupling securityVSAvoidpress-fit tolerance

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent employs parameter changes in the form of interference fit dimensions, material elasticity moduli, and pressurizing force magnitudes to achieve secure coupling. By carefully selecting and coordinating these parameters within standardized tolerance ranges, the design achieves reliable coupling without requiring extremely tight manufacturing precision, as the elastic deformation compensates for minor dimensional variations.

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

The press-fit structure and method provide a stable assembly effect by restricting the object's direction and allowing for precise positioning, preventing loosening, and enabling various material types and configurations for different applications.

Implementation Method 1

The pressurizing portion is for applying a pressure on an object to cause a material of the object to flow into or enter the material storage space

Methodology Applied

Scientific EffectPressure: Pressure Increase

Implementation Method 2

cause a material of the object to flow into or enter the material storage space

Methodology Applied

Scientific EffectMaterial flow: Deformation

Data Source

PatentUS20230193934A1Press-fit structure and press-fit method thereof

Publication Date: 2023.06.22 DTECH PRECISION INDS

AI summary

A press-fit structure and a press-fit method are introduced. The press-fit structure includes a body, a pressurizing portion, a material storage space, a restricting portion and a limit stop portion. The pressurizing portion is for applying a pressure on an object to cause a material of the object to flow into or enter the material storage space. The object is restricted by the restricting portion, and a restriction direction of the press-fit structure is restricted by the limit stop portion. Thus, the press-fit structure and the press-fit method of the present disclosure are enabled to provide a required object with a stable assembly effect.