Electric Push Rod Dual Braking for Lead Screw Backdrive Control
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Solution Overview
Problem
Existing electric push rods lack effective braking mechanisms, leading to unstable operation and potential damage when handling heavy loads, as the lead screw can reverse direction upon motor stoppage, causing the telescopic pipe to descend quickly without immediate braking.
Innovation Solution
An electric push rod with a dual brake mechanism, comprising a first brake mechanism on the driven wheel and a second brake mechanism between the driven wheel and telescopic pipe, which engage to provide braking effects during extension and retraction, respectively, ensuring stability and preventing structural damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a worm screw and worm wheel set is used for transmission, then transmission power is large, but the lead screw rotates in reverse direction due to load when the motor stops, causing the telescopic pipe to descend quickly without braking
Solution Approach 1:
The braking function is segmented into two independent brake mechanisms: a first brake mechanism that acts on the driven wheel, and a second brake mechanism that acts on the lead screw. Each brake handles specific operational phases (extension and retraction), dividing the braking task to ensure comprehensive control and prevent reverse rotation under load.
Solution Approach 2:
The brake mechanisms are designed to engage automatically before reverse rotation can occur. When the motor stops, the brakes immediately engage to prevent the lead screw from rotating in reverse due to load, providing preliminary protective action before damage can occur.
2Ease of operation
If the telescopic pipe is screwed and coupled to the lead screw, then linear displacement is achieved, but the lead screw is prone to reverse rotation and structural damage under heavy loads
Solution Approach 1:
The brake mechanisms apply counteracting forces to prevent the harmful reverse rotation of the lead screw before it can occur. The first brake on the driven wheel and the second brake on the lead screw create preliminary resistance against load-induced reverse motion, protecting the lead screw's structural integrity.
Solution Approach 2:
The design converts the potential harmful effect of heavy loads into a controlled braking action. The brake mechanisms are specifically designed to engage under load conditions, transforming the harmful reverse rotation force into a useful braking force that protects the lead screw structure.
3Device complexity
If no brake mechanism is provided, then the structure is simple, but the telescopic pipe descends quickly without braking when the motor stops, leading to unstable operation
Solution Approach 1:
The brake mechanisms are designed to be dynamically engaged based on operational conditions. During normal operation, the brakes remain disengaged to maintain simple operation. When the motor stops or under heavy loads, the brakes automatically engage to provide necessary braking control, creating a dynamic system that adapts to operational needs.
Solution Approach 2:
The brake mechanisms are designed to engage automatically based on the operational state of the system. When the motor stops or when heavy loads are detected, the brakes self-engage without requiring external control, providing automatic stability control while maintaining structural simplicity.
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 dual brake mechanism enhances the electric push rod's ability to handle heavy loads by maintaining structural integrity and stability, reducing noise, and ensuring reliable transmission with increased axial pushing or pulling force.
Implementation Method 1
the first brake mechanism produces a braking effect to the driven wheel... when the telescopic pipe extends outwardly, the second brake mechanism produces a braking effect to the driven wheel
Data Source
AI summary
An electric push rod with a dual brake mechanism includes an electric motor, a transmission device, a first brake mechanism and a second brake mechanism. The electric motor has a driving wheel. The transmission device is installed on a side of the electric motor and includes a deceleration mechanism, a lead screw, a driven wheel, and a telescopic pipe. The deceleration mechanism is disposed between the driving wheel and the driven wheel. The lead screw is sheathed with the driven wheel and the driven wheel is driven by the electric motor to rotate together with the lead screw. The telescopic pipe and the lead screw are screwed and driven. The lead screw is sheathed with the first brake mechanism formed on a side edge of the driven wheel. The lead screw is sheathed with the second brake mechanism disposed between the driven wheel and the telescopic pipe.