Motor Driven Linear Actuator Rigid Coupling via Rolling Bearing
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Solution Overview
Problem
Conventional motor driven linear actuators have weak coupling rigidity, leading to degraded performance in response speed and increased complexity due to the need for a fixing carriage-nut and coupling structure, which also increases the overall length and space requirements.
Innovation Solution
The motor driven linear actuator eliminates the need for a coupling and fixing carriage-nut by using a rolling bearing to directly connect the motor shaft and screw, achieving rigid coupling and concentric locating, thereby enhancing axial and radial rigidity and response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling and fixing carriage-nut are used to connect the motor shaft and screw, then the connection is secure, but the coupling rigidity is weak and the structure becomes complex
Solution Approach 1:
The patent merges the coupling and fixing carriage-nut functions into a single integrated structure. The motor shaft directly supports the screw through its own structural features (such as a built-in bearing or integrated support mechanism), eliminating the need for separate coupling and fixing components while maintaining connection security and improving rigidity.
Solution Approach 2:
The motor shaft is designed to perform multiple functions simultaneously: it transmits rotational motion, provides structural support for the screw, and maintains precise alignment. This multi-functionality replaces the need for separate specialized components like couplings and fixing carriage-nuts, reducing overall device complexity.
2Reliability
If a coupling and fixing carriage-nut are used to connect the motor shaft and screw, then the connection is secure, but the response speed is reduced
Solution Approach 1:
By integrating the support function directly into the motor shaft structure, the patent reduces the number of interface points and connection elements in the motion transmission path. This streamlined configuration minimizes inertial effects and mechanical compliance, enabling faster response speed while maintaining secure connection through the integrated design.
3Reliability
If a coupling and fixing carriage-nut are used to connect the motor shaft and screw, then the connection is secure, but the overall length and space requirements increase
Solution Approach 1:
The patent consolidates multiple components (coupling, fixing carriage-nut, and support structure) into the motor shaft itself or a single integrated element. This merging eliminates the need for additional axial space that would be required for separate components, thereby reducing the overall length of the actuator while maintaining secure mechanical connection.
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 configuration results in a more rigid and compact motor driven linear actuator with improved response speed and reduced space requirements, eliminating the need for a fixing carriage-nut and simplifying the coupling structure.
Implementation Method 1
a rolling bearing disposed between the electric motor and the ballscrew device and configured to support the screw rotatively
Data Source
AI summary
A motor driven linear actuator comprises an electric motor, a ballscrew device, and a rolling bearing. The electric motor includes a motor shaft having a first end portion. The first end portion includes an end surface and a receptacle having a first accommodation space. The ballscrew device includes a screw having a first end portion coaxially connected to the first end portion of the motor shaft. The first end portion of the screw includes a first section to be accommodated in the first accommodation space for fixing the screw with the motor shaft. The rolling bearing is disposed between the electric motor and the ballscrew device for supporting the first end portion of the screw. The end surface of the motor shaft contacts and abuts against the rolling bearing for limiting the movement of the rolling bearing between the electric motor and the ballscrew device.