Marine Propulsion Gear Case Circulator Mounting in Tight Bevel Gear Space
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Solution Overview
Problem
Existing marine propulsion devices face challenges in fixing circulators in a small space between bevel gears, leading to collisions and resistance in lubricating oil flow, which affects torque transmission efficiency.
Innovation Solution
A marine propulsion device with a case that includes an attachment hole for securing a circulator, using an attachment body to fix the circulator between gears, reducing lubricating oil collisions and enhancing torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the circulator is disposed between the front bevel gear and the rear bevel gear to inhibit collision of lubricating oil flow, then the resistance against gear rotation is reduced, but the space for fixing the circulator is limited and difficult to secure
Solution Approach 1:
The attachment hole is integrated directly into the case structure, merging the mounting function into the existing housing. This eliminates the need for separate mounting brackets or complex fixing mechanisms, allowing the circulator to be securely attached while maintaining a clean, integrated design.
Solution Approach 2:
The attachment hole serves as an intermediary element between the case and the circulator, providing a dedicated interface for secure mounting. This intermediary structure simplifies the fixing process by offering a pre-configured mounting point that accommodates the circulator without requiring modification of either the case or the circulator.
2Reliability
If the circulator is attached using a complex fixing mechanism, then the circulator can be securely fixed in the limited space, but the assembly and disassembly become difficult
Solution Approach 1:
The attachment system is segmented into the case-integrated attachment hole and the attachment body, allowing the circulator to be independently mounted and removed. This segmentation enables secure fixation during operation while simplifying maintenance activities, as the circulator can be easily detached without disassembling the entire gear mechanism.
Solution Approach 2:
The case provides its own mounting functionality through the integrated attachment hole, eliminating the need for external fixing mechanisms. This self-service approach allows the circulator to be securely mounted using only the case structure itself, simplifying both assembly and disassembly processes while maintaining reliable fixation.
Data Source
AI summary
A marine propulsion device includes a first gear, a second gear, a third gear, a circulator, a case, and an attachment body. The second gear is meshed with the first gear. The third gear is meshed with the first gear, and the third gear is coaxial with the second gear and opposed to the second gear. The circulator is between the second gear and the third gear. The case includes an internal space in which the first gear, the second gear, the third gear, and the circulator are located. The case includes an attachment hole to which the circulator is attached. The attachment body is inserted into the attachment hole so as to attach the circulator to the case.