Throttle Adjustment Device Shock Absorption Mechanism
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Solution Overview
Problem
Existing throttle adjustment devices for brush cutters are prone to component damage when subjected to large loads, such as shocks from the device falling, as they cannot absorb or distribute excessive force effectively, leading to potential breakage of locking components.
Innovation Solution
A throttle adjustment device with a connecting member that allows the throttle lever and sub lever to be interlocked or un-interlocked, featuring a concavo-convex fitting mechanism and a spring-urged pin member to maintain the un-interlocked state during normal operation, preventing accidental throttle adjustment and allowing idling rotation to absorb excessive force without increasing engine output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the throttle lever is locked at the initial position by the locking lever, then the engine can be prevented from being unintentionally driven, but the throttle lever cannot be moved from the initial position even if a shock is applied, leading to potential breakage of locking components
Solution Approach 1:
The patent applies the dynamics principle by making the locking mechanism adjustable rather than fixed. The locking lever can be positioned at multiple locations along the arc-shaped groove, allowing it to be locked in a position where it can absorb shock loads through controlled movement rather than rigid resistance. This dynamic positioning capability enables the system to adapt between secure locking for prevention and flexible positioning for shock absorption.
Solution Approach 2:
The arc-shaped groove is segmented into multiple positions along its length, allowing the locking lever to engage at different locations. This segmentation enables the locking mechanism to distribute shock loads across different engagement points rather than concentrating stress at a single fixed position, thereby preventing breakage while maintaining the anti-unintentional-start function.
2Ease of operation
If the throttle lever is strongly held to maintain throttle opening degree, then the throttle opening can be constantly maintained, but excessive force may damage the locking components when locked
Solution Approach 1:
The locking lever's ability to move along the arc-shaped groove provides a dynamic response to applied forces. When excessive force is applied, the locking lever can shift position rather than creating rigid stress concentration, allowing operators to maintain throttle opening degree through normal holding forces while protecting components from damage during abnormal high-force situations.
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
Prevents engine output increase and component damage by maintaining an un-interlocked state during excessive force application, allowing the throttle lever to idly rotate and preventing damage to locking components, while ensuring the device can be safely operated without unintentional throttle adjustments.
Implementation Method 1
a spring-urged pin member to maintain the un-interlocked state during normal operation
Data Source
AI summary
According to one embodiment, a throttle adjustment device, for a brush cutter in which an engine is mounted at one end of a handle pipe and in which a throttle adjustment wire extends from a throttle of the engine, include: a throttle lever having an operation portion to be operated by the user; a sub lever having a holding portion to be connected with an extending end of the throttle adjustment wire; a case to be fixed to the handle pipe, the throttle lever and the sub lever being rotatably mounted in the case; and a connecting member configured to bring the throttle lever and the sub lever into: an interlocked state where the throttle is adjustable in accordance with an operation amount of the throttle lever; or an un-interlocked state where the throttle is not adjustable regardless of the operation amount of the throttle lever.