Transmission Mechanism Deceleration via Wedged Intermediary Ring
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Solution Overview
Problem
Existing linear actuators face issues with self-locking and excessive nut speed, leading to frictional heat, power wastage, and discomfort due to rapid retraction speed, especially when the guide screw route is enlarged.
Innovation Solution
A transmission mechanism incorporating a guide screw, worm wheel set, intermediary ring, isolator, and needle rollers, where the intermediary ring is wedged by the isolator to increase frictional force, reducing rotational speed and preventing self-sliding, while allowing easy rotation without load, thus maintaining constant retraction speed and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the guide route of the guide screw is enlarged to increase mechanism efficiency or achieve faster moving speed, then the moving speed is improved, but the guide screw becomes unable to self-lock and the nut speed becomes too fast causing discomfort
Solution Approach 1:
The patent introduces an intermediary deceleration mechanism consisting of a brake disc, brake pad, and spring assembly that acts as a mediator between the motor and the guide screw. This intermediary component provides controlled friction-based deceleration, allowing the system to achieve both high speed during operation and reliable self-locking during positioning, resolving the contradiction between speed improvement and self-locking capability.
2Speed
If the guide route of the guide screw is enlarged to achieve faster moving speed, then the moving speed is improved, but frictional heat increases causing melting on the cylindrical portion
Solution Approach 1:
The patent extracts the braking function from the cylindrical portion and relocates it to a dedicated brake disc assembly. By separating the braking function from the structural cylindrical portion, the frictional heat is generated in the replaceable brake disc rather than the main cylindrical component, preventing heat accumulation and potential melting of critical structural elements while still enabling effective speed control.
3Reliability
If a coil spring is used for braking, then the braking function is achieved, but power is wasted continuously even when there is no loading
Solution Approach 1:
The patent employs a dynamic braking system where the spring-loaded brake pad engages with the brake disc only when deceleration or holding is required. The spring force is adjustable and can be disengaged or reduced when full braking force is not needed, allowing the system to maintain reliability when braking is required while minimizing power consumption during normal operation or when no loading is present.
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
The solution effectively reduces frictional heat, prevents power wastage, and enhances user comfort by maintaining consistent retraction speed under varying loads, while preventing self-sliding and heat generation.
Implementation Method 1
By means of the friction force generated between each needle roller and intermediary ring, the rotation of the guide screw in a specific direction is hindered to reach a deceleration function
Implementation Method 2
The isolator surrounds a peripheral edge of the intermediary ring with one side fixed to an actuator for limiting the intermediary ring to rotate in a single direction
Implementation Method 3
a worm wheel set, including a guide screw, a worm wheel set, an intermediary ring, an isolator and a passive sleeve. The worm wheel set is fitted onto one side of the guide screw and includes a worm wheel driven by the worm to rotate
Data Source
AI summary
A transmission mechanism having a deceleration function includes a guide screw, a worm wheel set, an intermediary ring, an isolator and a passive sleeve. The worm wheel set is fitted onto the guide screw and includes worm wheel and plural claw arms. A spacing slot is formed between any two adjacent claw arms. The intermediary ring is fitted onto a peripheral edge of each claw arm. The isolator surrounds a peripheral edge of the intermediary ring with one side fixed to an actuator. With plural grooves arranged on a peripheral edge thereof, the passive sleeve is fitted onto the guide screw. An accommodation space is formed among the groove, spacing slot and intermediary ring. Each needle roller is accommodated in the accommodation space and inter-contacted with the claw arm, the intermediary ring and the passive sleeve.