Tolerance-Compensating Delivery Component for Stable Assembly
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Solution Overview
Problem
Medicament delivery devices face manufacturing tolerance issues due to variability in component sizes, leading to potential rattling and the need for improved tolerance management.
Innovation Solution
The introduction of a medicament delivery device component featuring a base portion and a compensation member with a disc and protrusion configuration that allows for flexing in the axial direction to compensate for manufacturing tolerances, ensuring a tight fit and preventing rattling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high accuracy manufacturing is used for all components, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The device is divided into rigid components and flexible components. The flexible component is specifically designed to accommodate manufacturing tolerances, allowing other components to be manufactured with lower precision at reduced cost while maintaining overall device functionality.
Solution Approach 2:
The flexible component's physical properties are changed by designing it with flexible material characteristics and geometric features (such as the disc and protrusion configuration) that enable it to deform and compensate for dimensional variations in rigid components.
2Stability of the object's composition
If tight manufacturing tolerances are applied, then device stability is improved, but manufacturing complexity increases
Solution Approach 1:
The flexible component is designed to dynamically adapt to manufacturing variations through elastic deformation. This dynamic flexibility compensates for dimensional inconsistencies in rigid components, maintaining stable assembly without requiring complex manufacturing processes or tight tolerances across all parts.
3Strength
If rigid components are used throughout, then structural strength is improved, but tolerance compensation capability deteriorates
Solution Approach 1:
Different parts of the device have different mechanical properties. Rigid components provide structural strength where needed, while the flexible component is specifically designed with flexible material properties and geometry (disc with protrusion) to provide tolerance compensation capability in the axial direction.
Solution Approach 2:
The device combines rigid and flexible materials or structures. The flexible component may use elastomeric materials or flexible polymers that provide both the necessary flexibility for tolerance compensation and sufficient structural integrity for device operation.
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 design allows for cheaper production by tolerating lower accuracy, reduces stress on components, and increases device lifetime by compensating for manufacturing variations, thereby maintaining a stable assembly.
Implementation Method 1
wherein at least part of the disc is configured to flex relative to the base portion when acted on by a force in the axial direction
Data Source
AI summary
Medicament delivery device components that compensate for manufacturing tolerances are presented, where the medicament delivery device component can have a base portion extending in an axial direction relative to an axis, a compensation member having a first portion attached to the base portion and a second portion attached to the first portion and spaced apart from the base portion in the axial direction. The second portion can have a disc extending around the axis in the circumferential direction and a protrusion extending from the disc in the axial direction, wherein the protrusion is spaced apart from the first portion in the circumferential direction. At least part of the disc is configured to flex relative to the base portion when acted on by a force in the axial direction.