Outboard Motor Mount Structure for Vibration and Force Transmission
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Solution Overview
Problem
The existing mount structure of outboard motors faces challenges in efficiently transmitting propulsive force and absorbing vibration, particularly when propulsive force varies with engine speed, leading to potential damage and instability due to repeated contact and separation of components, and the inability to switch between vibration absorption and force transmission effectively.
Innovation Solution
A mount structure comprising a first member, a second member, a buffer member, and a pair of elastic members with different elastic moduli, where the buffer member includes a tubular outer and inner sleeve with elastic members fixed to their surfaces, allowing efficient transmission of propulsive force through the first elastic member at low speeds and additional transmission via the second elastic member at high speeds, while maintaining component fixation and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the cap is used to transmit propulsive force at high speeds, then force transmission efficiency is improved, but the cap may come off the bolt due to repeated contact and separation
Solution Approach 1:
The patent introduces a second elastic member (cap) as an intermediary element between the first elastic member and the sandwiching member. This second elastic member acts as a mediator that transmits propulsive force from the first elastic member to the sandwiching member, improving force transmission efficiency while preventing direct contact between the sandwiching member and the upper case, thereby preventing damage and ensuring reliability
2Object-affected harmful factors
If the cap is fixed to the upper case to prevent damage, then protection is improved, but vibration absorption at low speeds deteriorates
Solution Approach 1:
The patent creates a dynamic system where the second elastic member (cap) can move relative to the first elastic member and the sandwiching member. At low speeds, the cap separates from the sandwiching member, allowing the first elastic member to absorb vibrations. At high speeds, the cap contacts the sandwiching member to transmit propulsive force, thus adapting the system's behavior to different operating conditions
3Reliability
If a high-elasticity material is used to fill the space accommodating the cap, then the joined state can be maintained, but the ability to switch between vibration absorption and force transmission is lost
Solution Approach 1:
The patent divides the elastic member into two separate segments: the first elastic member (low-elasticity) and the second elastic member (high-elasticity cap). This segmentation allows each member to perform its specific function - the first elastic member absorbs vibrations and maintains the joined state, while the second elastic member transmits propulsive force, thereby maintaining both reliability and adaptability
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
This solution enables efficient transmission of propulsive force and effective absorption of vibrations at varying engine speeds, reducing the risk of component damage and ensuring reliable long-term operation by adapting the transmission mechanism based on engine speed.
Implementation Method 1
When the engine rotates at a low speed, absorption of vibration is important
Implementation Method 2
the second elastic member is opposed to the first end portion of the sandwiching member across a gap in the direction of action of the propulsive force
Data Source
AI summary
A mount structure of an outboard motor includes a first member, a second member, a buffer member, a sandwiching member, and a second elastic member. A propulsive force generated by a propeller of the outboard motor is applied to the first member. The second member is arranged such that the propulsive force is transmitted to the second member via the first member. The buffer member includes an outer sleeve fixed to the first member, an inner sleeve inserted in the outer sleeve, a first elastic member fixed to the outer sleeve and the inner sleeve. The sandwiching member is arranged to sandwich the second member and the inner sleeve in a direction of action of the propulsive force. The second elastic member is fixed to the first member. The second elastic member is opposed to the sandwiching member across a gap in the direction of action.