Actuator Bracket Unit Preventing Belt Gear Tooth Disengagement
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Solution Overview
Problem
Existing actuators for electronic parking brakes experience tooth disengagement between belt gears and driving gears, leading to noise and vibration issues due to changes in belt tension when generating parking force.
Innovation Solution
An actuator design that includes a bracket unit with support members to maintain belt tension, featuring cylindrical support members with varying diameters and an idler to prevent tooth disengagement, and a tensioner with an elastic member to ensure consistent belt engagement, reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a belt gear is used to transfer torque from the motor to the deceleration gear unit, then the torque transfer is achieved, but tooth disengagement between the belt gear and driving gear occurs due to belt tension changes
Solution Approach 1:
A tensioner device is introduced as an intermediary component to maintain proper belt tension. The tensioner includes a tension arm that applies force to the belt gear, ensuring consistent engagement between the belt gear teeth and driving gear teeth throughout the torque transfer cycle, preventing disengagement while allowing continuous operation
2Power
If the deceleration gear unit operates to amplify motor torque, then driving power is amplified, but vibration is generated and transferred to the actuator housing causing noise
Solution Approach 1:
The tensioner device converts the potentially harmful vibration and fluctuating forces generated during gear operation into a beneficial stabilizing effect. By continuously applying controlled tension to the belt gear, the tensioner dampens vibrations and prevents erratic tooth engagement, transforming the harmful oscillatory forces into smooth, controlled torque transfer that reduces noise and vibration transmission to the housing
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
Prevents tooth disengagement and reduces noise and vibration by maintaining consistent belt tension and engagement, ensuring stable torque transfer during parking brake operation.
Implementation Method 1
a tensioner installed in the bracket unit to support a portion of an outer peripheral surface of a belt gear in the belt driving device and prevent tooth disengagement of the belt gear. The tensioner may have an elastic member which is installed in the bracket unit adjacent to the rotation shaft
Data Source
AI summary
Disclosed herein is an actuator. The actuator, in accordance with an aspect of the present disclosure, includes a motor configured to generate torque, a gear device configured to amplify the torque, a belt driving device configured to transfer the torque to the gear device, and a bracket unit configured to fix a distance between a rotation shaft of the motor and a gear shaft of the gear device, wherein the bracket unit includes a pair of support members configured to support a portion of an outer peripheral surface of a belt gear in the bracket driving device and prevent tooth disengagement of the belt gear.