Lawn Mower Fuel Tank Layout for Hydraulic Access and Clearance

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Solution Overview

Problem

Existing lawn mowers face challenges in efficiently integrating hydraulic systems, fuel tank access, and ergonomic design, which affect maintenance accessibility and operator comfort.

Innovation Solution

Incorporating recessed channels in the fuel tank for hydraulic hoses, removable hydraulic reservoirs, a protruding fuel gauge, a pivotable thigh pad, and angled footplate supports, along with improved interlock designs and dampening washers to enhance accessibility and reduce vibration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If hydraulic lines are routed through the fuel tank structure, then hydraulic system integration is improved, but fuel tank access for maintenance becomes difficult

Engineering Contradiction:

Improvehydraulic system integrationVSAvoidfuel tank access

Core Design Contradiction:

Adaptability or versatilityVSEase of repair

Solution Approach 1:

The fuel tank is divided into two functional parts: the main tank body and the tower assembly (which contains the fuel gauge and hydraulic line connections). This segmentation allows the tower to be removed independently for fuel tank access while maintaining hydraulic system integration through the recessed channels in the tank body.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The recessed channels in the fuel tank act as intermediaries that guide and protect hydraulic lines between the hydraulic reservoir and the hydrostatic transmission. These channels provide a dedicated pathway that integrates the hydraulic system while allowing independent access to the fuel tank.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If hydraulic reservoirs are permanently mounted, then hydraulic system stability is improved, but maintenance accessibility becomes difficult

Engineering Contradiction:

Improvehydraulic system stabilityVSAvoidmaintenance accessibility

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The hydraulic reservoir mounting system transitions from a fixed permanent installation to a dynamically removable configuration. The reservoirs are mounted on a plate with attachment mechanisms that allow them to be easily removed for maintenance while maintaining stable operation during normal use.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If the fuel gauge is mounted protruding from the tank, then fuel level visibility is improved, but the gauge becomes vulnerable to damage

Engineering Contradiction:

Improvefuel level visibilityVSAvoidgauge protection

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The fuel gauge is nested within the tower structure that protrudes from the fuel tank. The tower provides a protective housing for the gauge while maintaining visibility through the dash panel hole. The gauge is positioned substantially flush with the dash panel, protecting it from external damage while keeping it viewable.

Inventive Principle:

Principle #7Nested doll (Nesting)

4Stability of the object's composition

If the thigh pad is fixed in position, then structural stability is improved, but adaptability for different operators is reduced

Engineering Contradiction:

Improvestructural stabilityVSAvoidoperator comfort

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The thigh pad transitions from a fixed position to a pivotable and removable configuration. This allows the thigh pad to be adjusted for different operators and removed for maintenance or storage, while maintaining structural stability when in use through its pivotable mounting mechanism.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260047527A1Power lawn mower with fuel tank and/or hydraulic fluid reservoir(s)

Publication Date: 2026.02.19 WRIGHT MFG INC

AI summary

A lawn mower may include at least one of: (a) recessed channel(s) in a fuel tank configured for receiving hydraulic hose(s); (b) hydraulic reservoirs, for hydraulic fluid for corresponding transmissions, mounted on a plate and configured to be easily removable for fuel tank access; (c) a fuel tank including a protruding tower including a fuel gauge, where the fuel gauge is configured to be viewable through a hole in a dash panel of the mower and mounted substantially flush with the hole in the dash panel plate; (d) a pivotable and removable thigh pad for stand-on applications where the thigh pad is configured to be easily removable by hand without the need for any tool; (e) a pivotal footplate with angle portions for receiving respective feet of a mower operator; (f) a support under the footplate, where cross members of the support are angled upwardly in order to increase clearance at bottom sides of the mower inside rear drive wheels, such as for improved curb clearance during mower operations and/or to provide for more efficient use of space; (g) an improved interlock design for selectively locking mower pivotal hand controls upon pulling of a parking brake lever/handle; and/or (h) at least one dampening washer (e.g., felt washer) and bearing structure positioned and configured to reduce vibration and/or oscillation/movement of pivotal mower hand controls.