Work Machine Bottom Cover Drain Hole Design for Water Discharge and Noise Reduction
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Solution Overview
Problem
Conventional work machines face issues with external air and foreign matter entering the casing through drain holes, causing malfunctions and noise leakage due to vibration.
Innovation Solution
A work machine design featuring a bottom portion cover with strengthening structure portions that include water-discharging ribs and blocked ribs, where the upper portion of the ribs is positioned over the drain holes to hinder air flow and reduce foreign matter entry, and the lattice-shaped structure allows efficient water discharge from multiple regions through fewer drain holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If drain holes are arranged in the housing to discharge water, then water discharge function is improved, but foreign matter entry risk increases
Solution Approach 1:
A mesh screen is introduced as an intermediary component within the drain hole structure. The mesh screen allows water to pass through while physically blocking foreign matter such as sand and debris from entering the housing, thus resolving the contradiction between water discharge efficiency and foreign matter prevention
Solution Approach 2:
The drain hole structure is designed with different properties in different regions: the upper portion includes a mesh screen for filtration, while the lower portion maintains open drainage capability. This local differentiation allows simultaneous achievement of water discharge and foreign matter blocking functions
2Productivity
If drain holes are opened to discharge water, then water discharge function is improved, but noise leakage increases
Solution Approach 1:
The mesh screen acts as an acoustic barrier that interrupts noise transmission paths. By filtering water flow while blocking air flow, the mesh screen reduces noise leakage from the interior to the exterior of the housing during water discharge operations
3Productivity
If multiple drain holes are arranged to discharge water from different regions, then water discharge coverage is improved, but foreign matter entry risk increases
Solution Approach 1:
Multiple drain holes from different regions are merged into a single integrated drain hole structure equipped with a mesh screen. This consolidation maintains comprehensive water discharge coverage while using one unified filtration barrier instead of multiple separate openings, thereby reducing overall foreign matter entry risk
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 effectively reduces air flow and foreign matter entry, inhibits noise leakage, and efficiently discharges water, preventing malfunctions in engine, electrical, and electronic components while minimizing the number of drain holes needed.
Implementation Method 1
air flowing inside from the drain hole collides with the strengthening structure portion once and thereby the flow of air is hindered
Implementation Method 2
the strengthening structure portions can attenuate noise generated inside the casing due to vibration of the engine, before the noise reaches the drain hole
Implementation Method 3
water inside the casing can be discharged outside from the bottom portion cover through the drain hole
Data Source
AI summary
A work machine that can discharge water collected inside a casing to the outside, reduce leakage of noise, and reduce entry of foreign matter from outside. The work machine includes a bottom portion cover forming a portion of a casing, and the bottom portion cover includes: at least two ribs and a bead (strengthening structure portions) that are formed substantially perpendicular to a bottom surface of the bottom portion cover; and a drain hole located in a connecting portion connecting the bottom surface of the bottom portion cover and a water-discharging rib among the at least two ribs. An upper portion of the water-discharging rib is located over the drain hole.