Washer Pump Noise Suppression Capacitor Arrangement
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Solution Overview
Problem
Existing pump devices face challenges in efficiently disposing electrical noise suppression components due to space constraints, leading to difficulties in achieving a good press-fit connection of terminals in the terminal member, which affects the noise suppression performance.
Innovation Solution
The design includes a tubular housing with a noise suppression device that orients electrical elements orthogonally to the axial direction, utilizing a retaining member with stopper and biasing portions to maintain precise positioning and prevent deformation, allowing for efficient space utilization and stable terminal connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electrical elements are disposed closer to each other to reduce installation space, then the compactness of the pump device is improved, but the press-fit connection quality deteriorates due to terminal member deformation
Solution Approach 1:
The patent changes the arrangement dimension of electrical elements from a linear sequence to a two-dimensional grid pattern. The first and second electrical elements are arranged side-by-side in the width direction rather than end-to-end in the length direction, reducing the axial installation space while maintaining sufficient distance between terminals for proper press-fit connections.
Solution Approach 2:
The patent employs asymmetric terminal arrangements where the first electrical element has terminals at opposite ends of its body, while the second electrical element has one terminal disposed between the terminals of the first element. This asymmetric configuration optimizes space utilization while preventing terminal member deformation during press-fit operations.
2Length of stationary object
If capacitors are disposed inclined with respect to the axial direction to reduce installation space in the axial direction, then the radial space utilization is improved, but the axial installation space increases
Solution Approach 1:
The patent transitions from inclined axial arrangement to a radial arrangement perpendicular to the axial direction. The electrical elements are positioned side-by-side in the width direction, effectively utilizing radial space while minimizing axial footprint, thereby resolving the contradiction between axial and radial space utilization.
3Adaptability or versatility
If press-fit grooves are disposed in the terminal member for multiple electrical elements, then the connectivity is improved, but the groove width decreases due to member displacement making press-fit difficult
Solution Approach 1:
The patent segments the terminal member into distinct regions for each electrical element connection. By spacing the press-fit grooves appropriately and arranging electrical elements in a two-dimensional pattern, each groove maintains sufficient width independent of adjacent grooves, preventing cumulative displacement effects while maintaining versatility for multiple connections.
Data Source
AI summary
In a noise suppression device of a washer pump, a first capacitor and a second capacitor are disposed with their height directions along a first direction orthogonal to an axial direction of the washer pump. This thereby enables installation space for the first capacitor and the second capacitor to be suppressed from becoming larger in the axial direction. A second terminal of the second capacitor is disposed between first terminals of the first capacitor. This thereby enables the installation space of the first capacitor and the second capacitor to be made smaller in the first direction and in a second direction orthogonal to the axial direction. The space between the pair of first terminals (the second terminals) is accordingly efficiently utilized for disposing the second terminal (the first terminal), enabling the first capacitor and the second capacitor to be disposed efficiently.