Cluster block fixing structure, electric motor to which cluster block is mounted by the cluster block fixing structure, electric compressor having cluster block fixing structure, and air-conditioning apparatus, refrigerator, and on-vehicle apparatus having the electric compressor mounted thereto
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Solution Overview
Problem
Existing methods for mounting a cluster block to a bobbin in electric compressors face challenges in achieving easy installation while ensuring the cluster block remains securely attached, as interference issues during press-fitting can lead to either detachment or difficulty in mounting.
Innovation Solution
A cluster block fixing structure that includes a protrusion and a through hole design, allowing the cluster block to be easily mounted by inclining and pivoting the bottom plate, and utilizing the elastic reaction force of motor wires to maintain contact and enhance positioning accuracy, thereby preventing unintended detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fitting portion is lightly press-fitted to the holding tool, then the cluster block can be easily mounted, but the fitting portion is likely to be detached
Solution Approach 1:
The fixing structure is divided into multiple functional elements: a through hole for insertion, a regulation surface for positioning, and an opposing structure for locking. This segmentation allows each element to perform its specific function - easy insertion through the hole, precise positioning via the regulation surface, and secure locking through the opposing structure - resolving the contradiction between ease of mounting and attachment reliability
Solution Approach 2:
The protrusion is inserted into the through hole, creating a nested configuration where the fixing structure is contained within the cluster block. This nesting ensures that the components remain aligned and connected, preventing detachment while maintaining ease of assembly through the insertion mechanism
2Reliability
If the interference is large in the press-fitting, then the cluster block can be securely attached, but press-fitting becomes difficult and mountability is degraded
Solution Approach 1:
The regulation surface acts as an intermediary between the protrusion and the opposing structure. It provides a controlled interface that guides the protrusion into proper alignment and maintains consistent contact, enabling secure attachment without requiring excessive press-fitting force. This intermediary surface mediates the interaction to achieve both reliability and ease of mounting
Solution Approach 2:
The design changes the geometric parameters of the fixing structure, specifically creating a through hole with sufficient diameter to accommodate the protrusion without requiring tight press-fitting. By adjusting these dimensional parameters, the structure achieves secure attachment with minimal assembly force, resolving the contradiction between attachment reliability and mounting ease
3Device complexity
If the cluster block is directly mounted to the bobbin, then the number of mounting steps and components is reduced, but it is difficult to easily mount and simultaneously make detachment difficult
Solution Approach 1:
The fixing structure integrates multiple functions into a single component design: the through hole provides insertion guidance, the regulation surface ensures proper positioning, and the opposing structure creates secure locking. This multi-functionality allows the cluster block to be directly mounted to the bobbin with a single integrated fixing mechanism, reducing both component count and mounting complexity while maintaining ease of assembly and secure attachment
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
Facilitates easy mounting of the cluster block while ensuring secure attachment, enhancing positioning accuracy, and reducing the likelihood of unintentional detachment, thus improving the mountability and stability of the cluster block.
Implementation Method 1
utilizing the elastic reaction force of motor wires to maintain contact and enhance positioning accuracy
Data Source
AI summary
To provide a cluster block fixing structure that allows a cluster block to be easily mounted to a bobbin and simultaneously makes detachment of the cluster block difficult after the cluster block has been mounted, and the like. A cluster block includes a second plate portion in contact with a bobbin, a first through hole penetrating through the second plate portion, and a wall portion having a regulation surface facing toward the first through hole and protruding from the second plate portion. The bobbin includes a protrusion to be inserted into the first through hole, and a projection projecting from the end of the protrusion in the same direction as a direction in which the regulation surface faces. The second plate portion and the projection oppose each other in a state where the contact surface of the bobbin is in contact with the regulation surface.