Ambidextrous Marine Tiller Shift Lever With Magnetic Sensing

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Solution Overview

Problem

Existing tiller designs for marine drives require users to disassemble and reconfigure the tiller arm to change the lever position, limiting ergonomic use and lacking steer-by-wire control systems for shifting gear positions.

Innovation Solution

An ambidextrous shift lever design with a pivotably coupled lever and sensor system that allows operation from either side, featuring a detent mechanism for position retention and a stop mechanism to prevent over-pivoting, coupled with a magnetic sensor for electronic communication to a controller for controlling marine drive operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the lever is fixed on one side of the tiller arm, then the structure is simple, but the ergonomics and usability are limited

Engineering Contradiction:

ImproveergonomicsVSAvoidstructure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The lever is designed with asymmetric port and starboard arms that extend to opposite sides of the tiller arm, allowing manual operation from either side while maintaining a unified structural design. This asymmetric configuration resolves the contradiction by enabling ergonomic flexibility without requiring multiple separate structures.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The single lever structure serves multiple functions by being operable from both port and starboard sides, eliminating the need for separate levers for each side. This multi-functionality approach improves ergonomics while avoiding the complexity of multiple separate lever systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the lever position is changed by disassembly and reconfiguration, then the adaptability is improved, but the ease of operation and time efficiency deteriorate

Engineering Contradiction:

Improvelever position flexibilityVSAvoidoperation convenience

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The lever is designed with dynamic capability to pivot between port and starboard positions around a central axis, allowing users to switch operating sides without disassembly. This dynamic design provides position flexibility while maintaining ease of operation through simple rotational movement rather than complex reconfiguration.

Inventive Principle:

Principle #15Dynamics

3Extent of automation

If manual lever operation is used, then the device complexity is low, but the automation level and operational efficiency are limited

Engineering Contradiction:

Improvesteer-by-wire controlVSAvoidcontrol system

Core Design Contradiction:

Extent of automationVSDevice complexity

Solution Approach 1:

A sensor system acts as an intermediary between the manual lever operation and the marine drive control system. The sensor detects lever position and transmits signals to the controller, enabling automated steer-by-wire control while preserving the simple manual interface. This intermediary approach increases automation without requiring complex direct electronic controls.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The mechanical direct-link control system is partially replaced with an electronic sensor-based system that detects lever position and communicates with the marine drive controller. This substitution maintains the simplicity of manual operation while introducing automated control capabilities through electronic sensing and signaling.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Ease of operation

If the lever can pivot freely without limits, then the ease of operation is improved, but the reliability and safety deteriorate due to over-pivoting

Engineering Contradiction:

Improvelever movement freedomVSAvoidover-pivoting prevention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

Stop mechanisms are pre-positioned on the tiller arm to prevent the lever from pivoting beyond safe limits. These stops are built into the design beforehand, providing automatic mechanical restraint that prevents over-pivoting while allowing full legitimate range of motion. This preliminary protective measure maintains operational freedom while ensuring reliability.

Inventive Principle:

Principle #9Preliminary anti-action

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 ergonomic operation from either side of the tiller arm and facilitates steer-by-wire control, enhancing user convenience and operational efficiency.

Implementation Method 1

a magnet is coupled to the shift lever such that pivoting of the shift lever rotates the magnet, the sensor being a magnetic sensor which senses pivoting of the magnet

Methodology Applied

Scientific EffectMagnetic field sensing: Magnetic Field

Data Source

PatentUS20250256824A1Tillers that facilitate ambidextrous shifting of a marine drive

Publication Date: 2025.08.14 BRUNSWICK CORP

AI summary

A tiller is for steering a marine drive relative to a marine vessel. The tiller has a tiller arm and a lever for changing an operational characteristic of the marine drive. The lever is pivotably coupled to the tiller arm along a lateral pivot axis and extends along both the port side and the starboard side of the tiller arm and thus is manually operable from both the port side and the starboard side of the tiller arm. A sensor is configured to sense pivoting of the lever and electronically communicate a sensed position of the lever to a controller for controlling an operational characteristic of the marine drive.