Linear Actuator Motor Mounting for Assembly Precision
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Solution Overview
Problem
Existing linear actuators face challenges in assembly due to components being placed into the housing in an unfixed condition, leading to assembly tolerances and inconvenience.
Innovation Solution
A linear actuator design featuring a housing with a base case and cover case, where the motor is screwed to a screw bracket on the base case and the transmission assembly, including a worm and worm wheel, is fixed in place, allowing for easier assembly and reduced assembly tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If components are placed into the lower cover one by one without preliminary fixing structures, then the assembly process is simpler, but assembly precision deteriorates leading to tolerance accumulation
Solution Approach 1:
The patent applies preliminary action by providing fixing structures (ribs and grooves) on the lower cover before components are assembled. The ribs extend from the inner wall to form positioning features, and grooves are formed to receive corresponding components, ensuring precise positioning is established in advance rather than relying on post-assembly adjustments.
Solution Approach 2:
The patent uses ribs and grooves as intermediary structures that mediate between the lower cover and components like the worm wheel and motor. These intermediary features provide the necessary positioning and fixing functions, allowing components to be accurately located during assembly without complex direct coupling mechanisms.
2Adaptability or versatility
If components are placed into the lower cover in an unfixed condition, then the assembly process is more flexible, but assembly convenience deteriorates due to lack of positioning
Solution Approach 1:
The fixing structures (ribs and grooves) are preliminarily formed on the lower cover to provide automatic positioning during assembly. This preliminary action ensures that components like the worm wheel and motor are correctly positioned as they are installed, making the assembly process more convenient without reducing flexibility.
Solution Approach 2:
The ribs and grooves create a self-positioning system where components automatically find their correct positions during assembly. The worm wheel fits into its corresponding groove, and the motor is positioned by its mounting features, allowing the assembly to self-align without requiring external positioning tools or complex procedures.
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 more precise and efficient assembly by fixing the motor to the base case before assembling the transmission components, reducing the risk of assembly errors and tolerances.
Implementation Method 1
The motor is screwed to the screw bracket and is disposed out of the base case. The motor has an actuating shaft penetrating into the base case and engaged with the worm wheel.
Implementation Method 2
The transmission assembly comprises a worm and a worm wheel disposed at an end of the worm. The worm and the worm wheel are linked to rotate simultaneously.
Implementation Method 3
A screw bracket is formed on an outer surface of the base case. The motor is screwed to the screw bracket.
Data Source
AI summary
A linear actuator includes a housing, a transmission assembly, a slider, and a motor. The housing includes a base case and a cover case which are opposite combined with each other. A screw bracket is formed on an outer surface of the base case. The transmission assembly includes a worm and a worm wheel disposed at an end of the worm. The slider is disposed on the housing and engaged with the worm. The motor is screwed to the screw bracket and disposed out of the base case. The motor has an actuating shaft penetrating into the base case and engaged with the worm wheel. The motor can be fixed to the screw bracket in advance, which facilitates the assembly of the transmission assembly to the base case.