Riding Mower Dust Removal Seal for Debris Prevention
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Solution Overview
Problem
Conventional dust removal systems for riding lawn mowers fail to effectively prevent grass cuttings and small debris from entering the engine compartment, leading to overheating due to accumulation and interference issues with the universal coupling and perforated board.
Innovation Solution
A dust removal system with a perforated board that rotates integrally with the engine's output shaft and a seal unit, comprising a radially extending flange and an elastic ring member, to prevent debris from entering the engine compartment, and a cutter to finely cut grass cuttings, reducing the risk of overheating and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the space between the perforated board and draft guide cover is enlarged to avoid interference, then the risk of unusual sounds and damage is reduced, but grass cuttings and debris can flow into the engine compartment through the enlarged space
Solution Approach 1:
A seal member is introduced as an intermediary component between the perforated board and draft guide cover. This seal member fills the gap space, preventing debris from entering the engine compartment while allowing the perforated board to swing freely without interference. The seal member acts as a mediator that simultaneously addresses both the interference avoidance and debris prevention requirements.
Solution Approach 2:
The seal member is configured as a flexible elastic body that can deform to accommodate the swinging motion of the perforated board. This flexibility allows the seal to maintain contact and sealing effect while permitting the necessary movement, thus preventing debris entry without restricting the perforated board's operational range.
2Reliability
If the space between the perforated board and intermediate shaft is enlarged to avoid interference, then the risk of damage to the perforated board is reduced, but the circumference of the sealing space is shortened, reducing sealing effectiveness
Solution Approach 1:
The seal member serves as an intermediary that fills the gap between the perforated board and intermediate shaft. By positioning the seal member in this space, the system achieves both objectives: the perforated board can swing without interfering with the intermediate shaft, and the seal member maintains a sufficient sealing circumference to prevent debris from entering through the insertion hole area.
3Stability of the object's composition
If the perforated board rotates integrally with the output shaft, then the perforated board does not swing relative to the draft guide cover, but the intermediate shaft still swings relative to the perforated board, requiring a large insertion hole
Solution Approach 1:
The seal member is designed as a flexible elastic body that can accommodate the relative swinging motion between the intermediate shaft and perforated board. This flexibility allows the insertion hole to be smaller in diameter while still preventing debris entry, as the seal member compensates for the positional variations during operation.
Solution Approach 2:
The seal member acts as an intermediary element that bridges the gap created by the relative motion between the intermediate shaft and perforated board. It allows the integral rotation configuration to be maintained while providing the necessary clearance accommodation and sealing function.
4Reliability
If the insertion hole is formed large in diameter to avoid interference, then the swinging displacement of the intermediate shaft is accommodated, but grass cuttings can still flow through the space and accumulate in the engine compartment
Solution Approach 1:
The seal member is positioned as an intermediary component that fills the space around the intermediate shaft and insertion hole. It allows the intermediate shaft to swing freely within the larger insertion hole without causing interference, while simultaneously blocking the path of debris that would otherwise enter through this enlarged opening.
Solution Approach 2:
The flexible elastic body of the seal member can deform to accommodate the swinging motion of the intermediate shaft within the large insertion hole, while maintaining continuous sealing contact to prevent debris from passing through the gap between the seal member and the engine compartment.
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
The system effectively seals the space between the universal coupling and perforated board, preventing debris entry and reducing overheating, while also minimizing the risk of unusual sounds and damage, and reducing the need for cleaning labor.
Implementation Method 1
a ring member which is made of an elastic material and in which one end is mounted on the flange and the other end is in contact with the peripheral area around the insertion hole
Data Source
AI summary
A dust removal system for a riding lawn mower, comprising an engine, a speed change device disposed outside of an engine compartment, and a universal coupling inserted through an opening provided to a separating wall in order to connect an output shaft of the engine and an input shaft of the speed change device. The dust removal system is composed of a perforated board which rotates integrally with the output shaft and around the axis of the output shaft in order to impede grass cuttings from flowing into the engine compartment through the opening, the perforated board having an insertion hole formed in the center to allow the universal coupling to be inserted; and a seal unit for substantially sealing the space between the universal coupling and the peripheral edge of the insertion hole. The seal unit has a radially extending flange formed on the universal coupling, and a ring member in which one end is mounted on the flange and the other end is in contact with the peripheral area around the insertion hole.