Work Vehicle Suspension Link Geometry for Ground Clearance Stability
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Solution Overview
Problem
Work vehicles face issues with maintaining minimum ground height and ramp angle while preventing yawing, weed entry into exhaust manifold gaps, and achieving an aesthetically deep front grill appearance without ventilation.
Innovation Solution
The solution involves a wheel support system with adjustable pivot axes and elastic members to maintain ground height and prevent yawing, a flexible heat-insulating cover for the exhaust manifold to prevent weed entry, and a front grill design with small protruding portions to enhance appearance by scattering light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lower joint axis is located lower than the lower pivot axis to maintain minimum ground height and ramp angle, then the ground clearance is improved, but the wheel support member tilts forward when wheels are raised and lowered, causing vehicle yawing
Solution Approach 1:
The patent applies asymmetry by making the upper link and lower link have different lengths and configurations. The upper link has a longer distance between its pivot axis and joint axis compared to the lower link, creating an asymmetric link mechanism that compensates for the forward tilt caused by the lowered lower joint axis position.
Solution Approach 2:
The patent changes the geometric parameters of the link mechanism, specifically setting the lower joint axis lower than the lower pivot axis while adjusting the link lengths and pivot positions to achieve both ground clearance and stability requirements.
2Temperature
If a space area is provided between the exhaust manifold and sound insulation cover for heat and sound insulation, then thermal insulation is improved, but weeds can enter and deposit on the exhaust manifold
Solution Approach 1:
The patent uses a flexible heat-insulating cover that can be bent to conform to the engine body and exhaust manifold surfaces. This flexible membrane maintains the thermal insulation space while preventing weed entry through its continuous, gap-free coverage.
Solution Approach 2:
The heat-insulating cover acts as an intermediary barrier between the exhaust manifold and the external environment. It provides thermal insulation while simultaneously serving as a protective shield against weed deposition.
3Quantity of substance
If a plate-shaped porous member is attached to the back side of the front grill for ventilation, then air flow is improved, but the recessed portions appear shallow and lack aesthetic depth
Solution Approach 1:
The patent applies color changes by using black paint or black porous material in the recessed portions of the front grill. The dark color absorbs light and creates an optical illusion of greater depth, making the recessed portions appear deeper while maintaining the ventilation function.
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 maintains vehicle stability, prevents weed deposition on the exhaust manifold, and creates a deep appearance illusion in the front grill.
Implementation Method 1
a suspension mechanism configured to elastically support the wheel support member
Implementation Method 2
a plate-shaped heat-insulating cover made of a flexible heat-insulating material is provided at a position spanning between an upper portion of an engine body and the exhaust manifold cover
Data Source
AI summary
A work vehicle includes: a wheel support member configured to support a pair of left and right traveling wheels; a link mechanism configured to support the wheel support member such that the wheel support member can be raised and lowered, the link mechanism being provided spanning between a vehicle body and the wheel support member; a suspension mechanism configured to elastically support the wheel support member, the suspension mechanism being provided spanning between a suspension support portion, which is formed on the vehicle body, and the wheel support member; and a lateral link configured to restrict leftward and rightward movement of the wheel support member, the lateral link being joined to a vehicle body-side support portion, which is formed on the vehicle body, and to a wheel-side support portion, which is formed on the wheel support member, wherein the link mechanism has: an upper link with an front end portion supported so as to be able to pivot up and down around an upper pivot axis by a link support portion, which is formed on the vehicle body, and with a rear end portion joined so as to be able to relatively pivot around an upper joint axis by the wheel support member; and a lower link with a front end portion supported so as to be able to pivot up and down around a lower pivot axis by the link support portion, and with a rear end portion joined to the wheel support member so as to be able to relatively pivot around a lower joint axis, a distance between the upper pivot axis and the upper joint axis is set shorter than a distance between the lower pivot axis and the lower joint axis, a gap width between the upper joint axis and the lower joint axis is set larger than a gap width between the upper pivot axis and the lower pivot axis, and when the vehicle body is in an unloaded state, the lower joint axis is located lower than the lower pivot axis.