Steering Lever Adjustment Assembly for Precise Neutral Alignment

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Solution Overview

Problem

Conventional steering lever adjustment systems in riding lawn mowers face challenges in achieving precise alignment and secure positioning without tool-assisted adjustments, particularly in designs offering infinite slot adjustments, which can lead to slip and difficulty in minor adjustments.

Innovation Solution

A rotatable adjuster, such as a lead screw, is used to finely set the position of steering levers without tools, allowing for precise alignment and adjustment through a pivot block and adjustment channel, enabling tool-free operation and potential motorized adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an infinite slot adjustment paradigm is used for steering levers, then the steering levers can be adjusted to an infinite number of locations, but slip occurs and the adjustment can move even after tightening

Engineering Contradiction:

Improveadjustment rangeVSAvoidadjustment stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent replaces the conventional mechanical slot-and-pin adjustment system with an electronic motorized adjustment system. A motor (220) receives signals from a controller (202) to automatically position the steering lever (34) at precise locations, eliminating the mechanical slip and movement issues inherent in slot-based systems while maintaining full adjustability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The adjustment system is designed to be self-adjusting through electronic control. The system includes sensors and controllers that automatically detect and correct positioning errors, eliminating the need for manual intervention and ensuring the adjustment remains stable without drifting, thus making the system self-correcting and reliable.

Inventive Principle:

Principle #25Self-service

2Reliability

If a finite adjustment paradigm with preconfigured locations is used, then the steering levers can be adjusted to specific positions, but it is very difficult to get the steering levers to line up properly

Engineering Contradiction:

Improveadjustment securityVSAvoidalignment precision

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the mechanical finite adjustment system with an electronic continuous adjustment system. The motorized actuator can position the steering lever at any location within the adjustment range, not just at preconfigured discrete positions, enabling precise alignment while maintaining secure positioning through electronic control feedback.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system transitions from discrete parameter adjustment (preconfigured locations) to continuous parameter adjustment (infinite positions). The electronic control system allows the steering lever position to be varied continuously across the full range, enabling precise alignment while the feedback control maintains reliability at any position.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If an infinite slot adjustment paradigm is used, then preconfigured locations are eliminated, but imprints are created within the adjustment slot making minor adjustments very difficult to achieve

Engineering Contradiction:

Improveadjustment flexibilityVSAvoidminor adjustment capability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The patent replaces the mechanical slot system that creates imprints with an electronic motorized positioning system. The motor can make incremental adjustments without physical contact that creates imprints, allowing minor adjustments to be made easily through electronic control without the degradation of the adjustment mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Enables exact alignment of steering levers at neutral positions, facilitating comfortable and secure operation by allowing fine adjustments without tools, and potentially incorporating motorized operation for ease of use.

Implementation Method 1

A rotatable adjuster, such as a lead screw, is used to finely set the position of steering levers

Methodology Applied

Scientific EffectLead screw mechanism: Screw

Data Source

PatentEP3968749B1Lawn care vehicle control lever adjustment assembly

Publication Date: 2026.02.25 HUSQVARNA AB

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AI summary

An adjustment assembly for adjusting a position of one of a pair of steering levers of a riding lawn care vehicle that has first and second drive wheels may include a sleeve, a base portion and a rotatable adjuster. The steering levers may be operably coupled to respective ones of the first and second drive wheels to selectively control the riding lawn care vehicle based on drive speed control of the first and second drive wheels responsive to positioning of the steering levers along forward and rearward directions. The sleeve may be operably coupled to one of the steering levers and the base portion may be operably coupled to the sleeve via a pivot coupling. The pivot coupling is configured to reposition the sleeve relative to the base portion along the forward and rearward directions responsive to operation of the rotatable adjuster to define non-discrete fixing relationships between the sleeve and the base portion along the forward and rearward directions.