Active Rotary Stabilizer with Cycloid Planetary Gear Reduction
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Solution Overview
Problem
Existing active rotary stabilizers for vehicles face challenges in reducing overall length, weight, and noise due to complex configurations and inefficiencies in reduction mechanisms, which complicate vehicle design and impact ride quality.
Innovation Solution
The implementation of a cycloid reduction unit in conjunction with a planetary gear reduction unit, along with a backlash reducing unit using serrated portions, to achieve efficient torque transmission and reduce overall length, weight, and noise, while incorporating an anti-torque prevention unit in the stabilizer bar link assembly to manage torsional forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a planetary gear reduction unit is used, then torque transmission efficiency is improved, but overall length and weight of the stabilizer increase
Solution Approach 1:
The patent combines a planetary gear reduction unit and a cycloid reduction unit into a single integrated actuator assembly. The planetary gear unit provides primary torque multiplication while the cycloid unit provides secondary reduction, achieving high torque transmission efficiency without requiring separate reduction mechanisms that would increase overall weight and dimensions.
Solution Approach 2:
The cycloid reduction unit is nested within the planetary gear reduction unit structure. The cycloid pin gear engages with the planetary gear carrier, allowing the second stage of reduction to occur within the spatial envelope of the first stage, thereby minimizing overall length and weight while maintaining efficient torque transmission.
2Power
If a two-stage reduction mechanism is used, then torque multiplication is improved, but device complexity increases
Solution Approach 1:
The patent merges two different reduction mechanisms (planetary gear and cycloid) into a compact integrated unit where both stages operate simultaneously within the same housing. This integration reduces the number of separate components and simplifies the overall structure compared to using two independent reduction mechanisms.
Solution Approach 2:
The actuator assembly serves multiple functions: the planetary gear unit provides primary reduction and torque multiplication, while the cycloid unit provides secondary reduction. Additionally, the cycloid pin gear acts as both a reduction element and a structural component connecting to the stabilizer bar, reducing the need for separate connection elements and simplifying the overall design.
3Power
If spline gear connection is used between rotary stabilizer bar and reduction unit, then torque transmission is improved, but noise from backlash increases
Solution Approach 1:
The patent modifies the geometric parameters of the spline gears by introducing inclined surfaces with specific angles. This parameter change allows the teeth to engage more smoothly and maintain continuous contact during rotation, eliminating backlash-induced noise while preserving efficient torque transmission capability.
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
This configuration reduces the overall length and weight of the vehicle, enhances ride comfort, and minimizes noise from backlash, improving design freedom and ride quality by efficiently managing torsional forces and noise.
Implementation Method 1
a cycloid reduction unit which is provided at the other side in the housing, receives the primarily reduced rotational force from an output shaft of the planetary gear reduction unit, and secondarily reduces the rotational force at a predetermined ratio
Implementation Method 2
a planetary gear reduction unit which is provided in the housing, is disposed to be adjacent to the drive unit, receives rotational force from the drive unit, and primarily reduces the rotational force at a predetermined ratio
Implementation Method 3
a backlash reducing unit using serrated portions
Implementation Method 4
an anti-torque prevention unit in the stabilizer bar link assembly to manage torsional forces effectively
Data Source
AI summary
The present invention relates to an active rotary stabilizer and a stabilizer bar link assembly for a vehicle, which particularly may increase a degree of design freedom for a lower side of a vehicle body, improve ride comfort for a passenger, enhance durability of an actuator, and reduce the occurrence of noise caused by a backlash when the actuator is operated.