Outboard Engine Trim Rod Receiver With Metal-Rubber Contact Damping
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Solution Overview
Problem
Existing outboard engine lifting/lowering devices face issues with sound generation, strength, and wear resistance at the contact point between the trim rod and receiving part due to increased load and friction.
Innovation Solution
An outboard engine lifting/lowering device with a receiving part featuring a buffer member made of resin or rubber and a contact member made of metal, where the metal contact member is designed to absorb and disperse the force, reducing sound and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a resin or rubber member is used for the receiving part, then sound generation is reduced, but strength and wear resistance deteriorate
Solution Approach 1:
The receiving part uses a composite structure combining a resin or rubber buffer member with a metal contact member. The resin/rubber portion absorbs sound and vibration, while the metal contact member provides the necessary strength and wear resistance at the contact point with the trim rod.
Solution Approach 2:
Different portions of the receiving part have different material properties: the buffer member is made of sound-absorbing resin or rubber, while the contact member is made of metal for strength. This local differentiation of material quality allows simultaneous achievement of sound reduction and mechanical strength.
2Power
If drive force is increased to improve propulsive force, then propulsive performance is improved, but load on contact part increases causing strength and wear problems
Solution Approach 1:
The metal contact member embedded in the resin/rubber buffer member provides enhanced strength and wear resistance to handle the increased loads from higher drive forces, while the resin/rubber matrix distributes the load over a larger area.
Solution Approach 2:
The buffer member is designed to preliminarily absorb and distribute the increased loads before they reach the contact point, preparing the contact member to handle the remaining load with reduced stress concentration.
3Strength
If a metal end block is used for the receiving part, then strength is improved, but sound generation upon contact increases
Solution Approach 1:
The receiving part combines metal contact member for strength with resin/rubber buffer member for sound absorption. This composite structure eliminates the sound generation problem of pure metal while maintaining the necessary strength through the metal contact component.
Solution Approach 2:
The resin or rubber buffer member acts as an intermediary between the metal contact member and the external environment, absorbing impact sounds and vibrations while allowing the metal contact member to maintain structural integrity and strength.
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
The solution effectively suppresses long-term sound generation while maintaining strength and wear resistance at the contact point between the trim rod and receiving part, improving operational durability.
Implementation Method 1
a buffer member (12) made of a resin or rubber; and a contact member (13) made of metal, which is provided on a surface of the buffer member at a side at which the trim rod is arranged, and which is in contact with the tip end of the trim rod
Data Source
AI summary
An outboard engine lifting/lowering device includes: a bracket which is to be rotatably provided to a hull and which is to be fixed to a propulsion device; and a rod unit which includes a tilt rod and a trim rod that are configured to rotate the propulsion device and the bracket. The bracket is provided with a receiving part configured to receive a tip end of the trim rod, and the receiving part includes: a buffer member made of a resin or rubber; and a contact member made of metal, which is provided on a surface of the buffer member at a side at which the trim rod is arranged, and which is in contact with the tip end of the trim rod.