Shaft Rotationally Fixed Connection via Elastic Holding Mechanism
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Solution Overview
Problem
Conventional transmission devices face inefficiencies due to high manufacturing costs and energy consumption in achieving a rotationally fixed connection between a shaft and a gear wheel, often resulting in reduced driving comfort and increased component loads, especially when dealing with large rotation speed differences.
Innovation Solution
A device featuring an actuating element that can be actively engaged with a component to equalize rotation speed differences and a holding mechanism to maintain the engaged state without continuous actor intervention, utilizing a spindle-nut arrangement for self-locking and fine-tuned pressing force adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronizers with frictional locking elements and claws are used to connect loose wheels to transmission shafts, then rotationally fixed connection is achieved, but manufacturing effort and production cost increase
Solution Approach 1:
The invention extracts and eliminates the complex frictional locking elements and claws from the synchronizer design. Instead of using these separate components, the patent employs a simplified actuating element with a pressing device that directly presses the loose wheel against the transmission shaft, achieving the same rotationally fixed connection without the elaborate locking mechanisms.
Solution Approach 2:
The pressing device is designed to be self-sustaining through elastic energy storage. The elastic element stores energy during engagement and automatically maintains the pressing force without requiring continuous external actuation, making the system self-service and eliminating the need for complex holding mechanisms.
2Device complexity
If frictional shift elements are used for engagement, then structure is simplified, but holding force must be applied constantly by an actor which reduces overall transmission efficiency
Solution Approach 1:
The actor operates periodically rather than continuously. It applies force only during the engagement phase to compress the elastic element, then the elastic element autonomously maintains the pressing force during the engagement period. This periodic action dramatically reduces energy consumption compared to continuous actuation.
Solution Approach 2:
The elastic element serves as an energy storage device that takes over the holding function after initial actuation. Once compressed by the actor, the elastic element automatically maintains the pressing force without further energy input from the actor, making the system self-sustaining during operation.
3Reliability
If positive interlock connection is made by self-reinforcement, then connection is achieved, but component can only be coupled when rotation speed difference is small, deteriorating driving comfort
Solution Approach 1:
The elastic element is pre-compressed by the actor before the actual engagement occurs. This preliminary action stores energy in advance, creating a cushioning effect that allows smooth engagement even when rotation speed differences are large. The pre-stored elastic energy absorbs the shock of engagement, preventing torque peaks and improving driving comfort.
Solution Approach 2:
The elastic element provides beforehand cushioning by being compressed in advance during the actuation phase. This cushioning effect is present before engagement occurs, allowing the system to handle large rotation speed differences smoothly without causing冲击 loads or deteriorating driving comfort.
4Device complexity
If hydraulic pressure is applied directly from inside the shaft to fix the loose wheel, then structure is compact, but low-friction sealing requires elaborate seals causing high energy consumption
Solution Approach 1:
The invention replaces the hydraulic pressure system with a mechanical elastic element. Instead of using hydraulic fluid and elaborate seals to transmit force, the patent uses a solid elastic element that can be directly compressed by the actor. This mechanical substitution eliminates the need for hydraulic seals and significantly reduces energy consumption associated with maintaining hydraulic pressure.
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 reduces energy demand during shift processes, enhances driving comfort, and improves overall transmission efficiency by minimizing the duration of shift phases and maintaining the rotationally fixed connection with reduced energy consumption.
Implementation Method 1
associated with the actuating element is a holding device with which the actuating element can be held in the shift condition at least equivalent to the rotationally fixed condition of the component
Implementation Method 2
which can be brought by an actor when the actor is actuated into active frictional connection in some areas with the component and by way of which a rotation speed difference, between the component and the shaft, can be at least approximately equalized
Data Source
AI summary
A device for connecting, in a rotationally fixed manner, a shaft to at least one component which is rotationally supported on the shaft, such as a gear wheel of a gear in a transmission. The device includes an actuating element that is rotationally fixed, but axially slides on the shaft, such that when the element is actuated by an actor, the element actively, frictionally communicates with the component to at least approximately equalize a rotational speed difference, between the component and the shaft. The actuating element can be actuated by the actor with a force to frictionally connect the component to the shaft in a rotationally fixed manner. The device further includes a holding device, which retains the actuating element in a shift condition essentially equivalent to the rotationally fixed condition of the component without further actuation of the actor.