Geared Motor Bayonet Coupling for Fast Coaxial Assembly
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Solution Overview
Problem
Existing geared motors face challenges in simple assembly and maintenance due to complex connections between the electric motor and gearbox.
Innovation Solution
The gearbox features a flange part with hollow cylindrical collar areas aligned coaxially with the electric motor's rotor shaft, allowing for easy centering and connection via a bayonet fitting mechanism, facilitated by a spring element and bayonet wings for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional screw connections are used to attach the electric motor to the gearbox, then the connection is secure, but the assembly and maintenance process becomes time-consuming and complex
Solution Approach 1:
The connection system is segmented into modular components: the flange part with collar area on the gearbox side, and the connecting part with two collar areas on the motor side. This segmentation allows for independent assembly of each component and enables the bayonet-style quick connection mechanism, where the first collar area engages with the flange part collar area, and the second collar area provides additional alignment and connection support.
Solution Approach 2:
The collar areas are pre-formed on the flange part and connecting part during manufacturing, with precise coaxial alignment and dimensional tolerances already established. This preliminary preparation of the connection interfaces eliminates the need for time-consuming on-site alignment and adjustment during assembly, allowing for rapid bayonet-style connection.
2Manufacturing precision
If complex connection mechanisms are used to ensure precise alignment, then the alignment accuracy is high, but the device complexity increases
Solution Approach 1:
The collar areas are designed with cylindrical (curved) geometry rather than flat surfaces. The first collar area on the connecting part fits coaxially onto the collar area of the flange part, creating a natural centering effect through the curved surfaces. This cylindrical interface automatically aligns the electric motor with the gearbox axis during the bayonet connection process, achieving high alignment precision without requiring complex alignment mechanisms or multiple adjustment steps.
Solution Approach 2:
The connecting part features a nested collar structure with two concentric collar areas - the first collar area (outer) engages with the flange part collar area, while the second collar area (inner) provides additional support and alignment. This nested arrangement of concentric cylindrical surfaces creates a hierarchical centering system that ensures precise coaxial alignment while maintaining a relatively simple overall structure.
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 design enables quick and secure assembly and maintenance of the geared motor by simplifying the connection process, ensuring accurate alignment and secure attachment without interference from screw heads.
Implementation Method 1
an advantage of this is that a quick connection via bayonet fitting is possible... the spring element generating an axially acting spring force that produces a frictional force
Implementation Method 2
the spring element generating an axially acting spring force that produces a frictional force, thus ensuring secure fixation
Data Source
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AI summary
The invention relates to a geared motor comprising an electric motor (11) and a gearbox, wherein: the gearbox has a flange part (3), which is fastened to a housing part of the gearbox by means of first screws (5); the flange part (3) has a hollow cylindrical collar region (6); a connection part (7) has a first hollow cylindrical collar region (6) and a second hollow cylindrical collar region (6); the first collar region (6) is located radially outside the second collar region; the first collar region (6) is fitted onto the collar region (6) of the flange part; the connection part (7) is connected to the electric motor (11) by means of second screws.