Swing Type Power Door Lock Actuator Simplified Structure
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Solution Overview
Problem
Conventional central car door locking systems, particularly swing type power door lock actuators, face issues with complex structure, installation difficulties, and high failure rates due to the arrangement of biasing means and manufacturing/installation errors affecting transmission performance.
Innovation Solution
A swing type power door lock actuator design featuring a housing with inner slide rails, a drive unit with a motor and screw shaft, a transmission unit with a toothed rack, and a swing unit with a sector gear and swing arms, enhancing precision and stability through direct engagement and coaxial pivot points, and incorporating a micro switch for precise motor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If biasing means are arranged in the motor drive system, then the motor can be biased during operation, but the structure becomes complicated and installation becomes difficult
Solution Approach 1:
The patent extracts the biasing function from the motor drive system by using a separate return spring arranged between the motor housing and the swing arm assembly. This separates the biasing mechanism from the motor itself, simplifying the motor structure while maintaining the necessary biasing capability for reliable operation.
Solution Approach 2:
The return spring acts as an intermediary element that provides the biasing force between the motor assembly and the swing arm mechanism. This mediator component allows the motor to be biased during operation without requiring complex internal biasing mechanisms within the motor itself.
2Ease of operation
If circular block and U-shaped groove matching is used for nut to swing arm transmission, then the transmission can be achieved, but manufacturing or installation errors cause operation inaccuracy
Solution Approach 1:
The patent segments the transmission system into distinct modular components: a square output shaft on the motor, a corresponding square recess in the sector gear, and separate swing arms connected via pins. This segmentation allows each component to be manufactured and assembled independently with standard tolerances, eliminating the need for precise circular block and U-shaped groove matching while maintaining accurate transmission.
Solution Approach 2:
Instead of using a circular block and U-shaped groove configuration that requires precise alignment, the patent inverts the approach by using a square shaft and square recess configuration. This inverted geometry provides inherent alignment and eliminates the sensitivity to manufacturing and installation errors that plagues the circular groove approach.
3Force
If conventional swing type actuator design is used, then the actuating force is high, but the failure rate increases due to complex structure
Solution Approach 1:
The patent extracts and eliminates the problematic biasing means from the conventional swing type actuator design. By using a separate return spring instead of integrated biasing mechanisms, the design maintains high actuating force while removing the sources of failure associated with complex biasing arrangements.
Solution Approach 2:
The patent discards the complex biasing means that cause high failure rates in conventional designs and recovers the essential function of biasing through a simpler return spring mechanism. This allows the actuator to maintain reliability while preserving the high actuating force characteristic of swing type designs.
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 design simplifies the structure, improves installation ease, reduces failure rates, and enhances operation accuracy and smoothness, resulting in a compact and reliable central car door locking system.
Implementation Method 1
The transmission unit is mounted inside the housing, comprising a screw shaft and a transmission seat. The screw shaft has one end thereof coupled to the motor. The transmission seat is slidably set between the two inner slide rails and threaded onto the screw shaft.
Implementation Method 2
The sector gear comprises a tooth-bearing face meshed with the toothed rack of the transmission unit.
Data Source
AI summary
A swing type power door lock actuator includes a housing having mounted therein a drive unit, which includes a motor, a transmission unit, which includes a screw shaft connected to the motor and a transmission seat threaded onto the screw shaft, and a swing unit, which includes a sector gear meshed with the transmission seat and a swing arm connected to the sector gear. When the motor is started, the screw shaft is driven to move the transmission seat, causing the sector gear to bias the swing arm between a locking position and an unlocking position.