Hydraulic Shaft Coupling for Fast Torque Transmission Connection
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Solution Overview
Problem
Existing portable hydraulic devices for rescue purposes face challenges in quickly and easily joining and separating rotary shafts for torque transmission, with interlock-type joints requiring alignment and magnetic joints being costly and complex.
Innovation Solution
A hydraulic device with a detachable torque transmission joint featuring a guide shaft and engaged portions around it, and a connecting portion with a guide hole and engaging portions, allowing for easy alignment and connection without the need for rotation phase matching, using projections and recesses with tilted tips for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interlock-type torque transmission joint is used, then reliable torque transmission is achieved, but the joining time increases due to rotation phase alignment requirements
Solution Approach 1:
A guide shaft is introduced as an intermediary component between the driving-side rotary shaft and the driven-side rotary shaft. The guide shaft includes engaged portions that can be engaged by engaging portions on the connecting portion, serving as a mediator that facilitates connection without requiring precise rotation phase alignment between the two rotary shafts.
Solution Approach 2:
The torque transmission joint is segmented into multiple functional components: a guide shaft with engaged portions, a connecting portion with engaging portions, and a driven-side rotary shaft. This segmentation allows each component to perform its specific function independently, with the guide shaft handling alignment and the engaging portions securing the connection.
2Ease of operation
If a magnetic joint is used as the torque transmission joint, then easy separation is achieved, but the structure becomes complicated and cost increases
Solution Approach 1:
The engaging portions are designed with tilted tips that automatically align and engage with the engaged portions on the guide shaft during the connection process. The tilted configuration allows the engaging portions to self-align and slide into place without requiring complex alignment mechanisms or external assistance.
3Ease of operation
If a magnetic joint is used as the torque transmission joint, then easy separation is achieved, but manufacturing cost increases
Solution Approach 1:
The torque transmission joint uses simple mechanical components made from conventional materials that can be manufactured using standard machining processes. The design prioritizes simplicity and manufacturability over using expensive specialized materials or complex assembly processes.
4Ease of operation
If engaged portions with tilted tips are used, then easy alignment and connection are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The engaged portions and engaging portions are designed with specific geometric parameters, including the tilted tip configuration and the number of portions (3-12). These parameter choices balance the need for easy alignment with manufacturability, allowing for adequate tolerance ranges during manufacturing while still achieving reliable connection.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A connected portion 68, 68m is disposed at an end of one of a rotary member 41 (first rotary shaft) of a tool unit 10 and a rotary shaft 62a (second rotary shaft) of a driving unit 60, and a connecting portion 52, 52m which is connected to the connected portion 68, 68m is disposed at an end of the other thereof. The connected portion 68, 68m has a guide shaft 68a that rotates integrally with the rotary member 41 or the rotary shaft 62a, and a plurality of engaged portions 68b, 68p disposed around the guide shaft 68a. The connecting portion 52, 52m has a guide hole 52a into which the guide shaft 68a is inserted, and the engaging portions 52b, 52q with which the engaged portions 68b, 68p are engaged and which are disposed around the guide hole 52a.