Compact Latch Actuator Spindle Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional latch actuators for vehicles require large installation space and complex construction, making them inefficient in terms of space and cost, and there is a need for a compact, cost-efficient, and reliable actuation method.
Innovation Solution
A latch actuator design featuring a spindle that rotates and axially displaces, utilizing a motion conversion mechanism with a helical engagement feature and speed reduction gearing, allowing for both rotational and translational motion, thereby achieving a compact and lightweight actuator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a rotary to linear motion conversion mechanism is used to convert rotary motion of an output shaft to purely translatory motion of the output member, then the latch can be actuated automatically, but the actuator requires large installation space and has complex construction
Solution Approach 1:
The patent combines rotational and translational motion capabilities into a single spindle component. The spindle performs both rotational movement (driven by the motor through gears) and translational movement (actuating the latch), eliminating the need for separate mechanisms and reducing overall construction complexity while maintaining automatic actuation
Solution Approach 2:
The spindle serves multiple functions simultaneously: it acts as both the rotational output member (receiving torque from the gear mechanism) and the translational actuator (pushing the latch mechanism). This multi-functionality reduces the number of components needed and simplifies the overall actuator design
2Extent of automation
If a rotary to linear motion conversion mechanism is used to convert rotary motion of an output shaft to purely translatory motion of the output member, then the latch can be actuated automatically, but the actuator requires large installation space
Solution Approach 1:
The patent merges the rotational and translational motion functions into a single integrated spindle component, eliminating the need for separate linear actuators or complex conversion mechanisms. This integration significantly reduces the volume required for the actuator while maintaining automatic operation capability
Solution Approach 2:
Instead of converting rotary motion to linear motion through a complex mechanism, the patent inverts the approach by having the spindle naturally perform both rotational and translational movements through its engagement with the gear mechanism, thereby reducing the space required for motion conversion
3Ease of operation
If systems with a rotating disk or other lever element as an output member performing purely rotational movement are used, then the latch can be actuated, but large installation space is required
Solution Approach 1:
The spindle is designed to perform both rotational and translational functions within a single component, replacing the need for separate rotating disks or lever elements. This multi-functionality achieves latch actuation while minimizing the installation space required
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 enables a compact, lightweight, and cost-efficient latch actuator that can be installed in a small space while maintaining reliability and efficiency in actuating vehicle latches, such as door locks, with the ability to withstand significant loads and operate quickly.
Implementation Method 1
A motion conversion mechanism is configured to cause the spindle to be displaced along the rotation axis when the spindle rotates, leading to a combination of axial displacement and rotation of the spindle
Data Source
AI summary
A latch actuator comprises a motor, a speed reduction gearing coupled to an output shaft of the motor, a spindle, and a motion conversion mechanism. The spindle has a threaded portion in engagement with the speed reduction gearing. The spindle is supported to be rotatable about an axis. The threaded portion is rotationally fixed relative to the spindle. The motion conversion mechanism is configured to cause a displacement of the spindle along the axis when the spindle rotates.