Threaded Motor-to-Gearbox Connection for Compact Geared Motors
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Solution Overview
Problem
Existing three-phase geared motors face challenges in achieving a compact size and variability in combining different electric motors with gears due to limitations in connection methods, such as screw connections that increase installation space and impair motor function, and require a flexible attachment to accommodate terminal box access.
Innovation Solution
A threaded connection between the transmission-side connecting device and the bearing plate using internal and external threads that surround the recesses, allowing for axial limitation and multiple thread starts for variable positioning, enabling a compact design without exceeding the motor and gear dimensions, and providing a sealing function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screw connections are used to connect the transmission housing to the bearing plate, then the connection is secure, but the installation space increases and the motor function may be impaired
Solution Approach 1:
The threaded connection allows the bearing plate to be nested within the transmission housing structure. The external thread on the bearing plate engages with the internal thread in the transmission housing, creating a compact integrated assembly where components are nested together rather than requiring separate mounting space for screw holes and fasteners.
Solution Approach 2:
The connecting device is merged with either the transmission housing or an intermediate flange, eliminating the need for separate connection elements. The threaded connection integrates the bearing plate and transmission housing into a unified structure, reducing the overall installation footprint while maintaining secure connection.
2Ease of operation
If bores are arranged outside the stator for screw access, then the connection is accessible, but the installation space increases beyond what is forced by the motor and gear itself
Solution Approach 1:
Instead of arranging bores outside the stator for accessibility, the invention inverts the approach by providing threaded connections that surround the recess in the bearing plate. The threading allows connection from the motor side without requiring external bore access, maintaining accessibility while minimizing installation space.
3Ease of manufacture
If an intermediate flange with tapered neck is used for screwing, then the connection is achieved, but the axial size becomes fairly large
Solution Approach 1:
The invention extracts the unnecessary tapered neck portion from the intermediate flange design. By providing direct threaded connections on the bearing plate and transmission housing, the solution eliminates the axial space consumed by the tapered neck while maintaining the feasibility of the screwing connection.
4Ease of manufacture
If through-holes are designed for screw connection, then the connection is achieved, but sealing becomes problematic
Solution Approach 1:
The invention employs sealing elements such as O-rings or sealing films in conjunction with the threaded connection. These flexible sealing components fit within the threaded connection structure, providing reliable sealing without requiring through-holes that would compromise the seal between the bearing plate and transmission housing.
Data Source
Figure 1~2
Figure 3a~4
AI summary
The motor (10) has a gear box-side link assembly (70) that enables a connection of a gear housing (22) with an end shield (42) of an electromotor (40) i.e. synchronous motor. A recess (62) is protruded by a driven shaft (48) connected with the gear housing at a gear housing or at an intermediate flange (60). The gear box-side link assembly and the end shield are interconnected by a threaded connection of an internal thread (72) and an external thread (50). The threads surround another recess (46) in the end shield and the former recess in the gear housing and/or in the intermediate flange.