Shaft Coupler Assembly for Easy Working Head Changes
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Solution Overview
Problem
Existing separable electric tools require complex user operations to establish a transmission connection between the motive power head and the working head, posing high operational demands.
Innovation Solution
A transmission system with a shaft coupler and coupling mechanism that automatically aligns and connects the shafts using biasing elements, and a locking mechanism to secure the connection, simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transmission shaft is disposed in a tube connecting the motive power head to the working head, then the transmission connection is established, but the user operation complexity increases when changing the working head
Solution Approach 1:
The transmission shaft is segmented into a first shaft portion in the motive power head and a second shaft portion in the working head, connected via a shaft coupler. This segmentation allows independent replacement of working heads while maintaining reliable transmission connection through the coupling mechanism with mating parts and biasing elements.
Solution Approach 2:
The shaft coupler is pre-configured with mating parts and biasing elements that automatically engage when the working head is attached. The biasing elements pre-load the coupling mechanism, ensuring immediate reliable connection upon assembly without requiring additional user operations to establish transmission.
2Reliability
If a shaft coupler with mating parts is used to connect the shafts, then the transmission connection is established, but the device complexity increases
Solution Approach 1:
The shaft coupler serves multiple functions: it connects the first and second shafts, maintains axial spacing, and provides automatic alignment through the biasing elements. The first and second mating parts are designed with universal engagement features that work with various working head types, reducing the need for specialized coupling structures.
Solution Approach 2:
The biasing elements automatically apply coupling force to engage the mating parts when the working head is attached. The system is self-aligning and self-securing, eliminating the need for complex manual alignment procedures or additional fastening operations, thereby reducing operational complexity despite the presence of multiple components.
3Reliability
If the shaft coupler requires precise circumferential alignment, then the transmission connection is established, but the assembly time increases
Solution Approach 1:
The biasing elements in the shaft coupler automatically apply radial coupling force to align and engage the first and second mating parts. This self-aligning mechanism eliminates the need for precise manual alignment, as the biasing elements guide the mating parts into proper circumferential alignment upon assembly, significantly reducing assembly time while ensuring reliable connection.
Solution Approach 2:
The shaft coupler is pre-loaded with biasing elements that are compressed in advance. When the working head is attached, this pre-stored elastic energy is released, causing the biasing elements to rapidly expand and force the mating parts into engagement, achieving quick automatic alignment without requiring time-consuming manual adjustment.
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
Facilitates easy and reliable transmission connection between the motive power head and working head, enhancing user experience by reducing assembly complexity and ensuring secure attachment.
Implementation Method 1
a coupling mechanism that is capable of directly or indirectly applying a coupling force to at least one of the first shaft, the second shaft and the shaft coupler
Implementation Method 2
the far-side part of the shaft coupler further comprises a guide channel located between a far-end opening of the shaft coupler and the second shaft hole. A cross section of the guide channel gradually decreases in size from the far-end opening towards the second shaft hole
Implementation Method 3
At least part of the guide channel may be a helical channel
Implementation Method 4
a locking mechanism to secure the connection
Data Source
AI summary
A work tool and transmission system thereof. The transmission system comprises: a first shaft (250) and a second shaft (350), a near end (351) of the second shaft having a first mating part; a shaft coupler (600), a far-side part (620) of the shaft coupler having a second mating part matched in shape to the first mating part; and a coupling mechanism capable of directly or indirectly applying a coupling force to at least one of the first shaft, the second shaft and the shaft coupler; when the far-side part of the shaft coupler is aligned with the near end of the second shaft in the circumferential direction, the coupling force forces the first mating part to engage with the second mating part, so that the shaft coupler transmits rotational movement of the first shaft to the second shaft. The work tool comprises: a transmission system; a motive power head transmission-connected to the first shaft (250); and a working head transmission-connected to the second shaft (350).