Cleaning Nozzle Cover Positioning in Support-Mounted Assemblies
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Solution Overview
Problem
Existing cleaning devices face issues with positioning accuracy of the cover with respect to the support, leading to impaired appearance and unexpected interference due to component tolerance or assembly errors.
Innovation Solution
The cleaning device incorporates a bracket and holder with retaining portions, an urging member providing an urging force, and a positioning member to prevent pivot motion about a second axis, enhancing positioning accuracy and reducing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an urging member is used to provide urging force between the bracket and holder, then the cleaning device can be securely attached to the support, but the urging force causes pivot motion about the second axis leading to misalignment of the cover with respect to the support
Solution Approach 1:
The positioning member acts as an intermediary element between the bracket and holder. It mediates the interaction by providing a geometric constraint that prevents pivot motion while allowing the urging member to maintain attachment security. The positioning member's specific geometry (such as a protrusion fitting into a recess or a pin constraint) serves as the mediating structure that eliminates the harmful degree of freedom without compromising the beneficial attachment force.
2Ease of manufacture
If component tolerance or assembly error exists between the bracket and holder, then manufacturing is easier and cost is reduced, but gaps are created that allow pivot motion causing misalignment and interference
Solution Approach 1:
The positioning member is designed in advance to compensate for expected component tolerances and assembly errors. By incorporating the positioning member with appropriate geometric features (such as clearance fits, orientation constraints, or adjustment mechanisms), the design anticipates and cushions against the potential misalignments that would otherwise occur due to normal manufacturing variations. This allows the system to maintain high positioning accuracy despite the use of standard tolerance components.
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 improves the positioning accuracy of the cover, preventing impairment and interference, thereby increasing manufacturing yield and reducing assembly errors.
Implementation Method 1
an urging member providing an urging force that urges the second retaining member toward the edge portion
Data Source
AI summary
A cleaning device adapted to be attached to a support formed with an opening includes a nozzle, a piston, a cover, a bracket, a holder, an urging member, and a positioning member. The nozzle is configured to jet fluid toward a target from a first position where is located outside the support. The piston is configured to displace the nozzle between the first position and a second position where is located inside the support along a first axis while passing through the opening. The cover covers the nozzle as viewed from the outside of the support in a direction along the first axis, and configured to move with the nozzle along the first axis. The bracket supports the piston, and has a first retaining portion retained on an edge portion of the opening from the outside of the support. The holder has a second retaining portion facing the first retaining portion from the inside of the support with the edge portion in between. The urging member provides an urging force that urges the second retaining member toward the edge portion. The positioning member is configured to prevent a pivot motion of at least one of the bracket and holder about a second axis extending in a direction that is not parallel to the first axis caused by the urging force.