Eccentric Speed Variator Flange Alignment
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Solution Overview
Problem
Eccentric speed variators used in automotive variable valve timing mechanisms face challenges with mechanical vibration and noise due to misalignment of rotors, which existing solutions attempt to address by increasing the number of parts, thereby raising production costs.
Innovation Solution
The design incorporates a first rotor, a second rotor, a third rotor, an engaging member, and a flange, where the third rotor rotates eccentrically to change the relative rotation phase and is stabilized by the flange contacting the second rotor's outer wall, minimizing inclination and friction, thus reducing mechanical vibration and noise without increasing parts or production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two rotors are used in the eccentric speed variator, then the device size is reduced and production cost is lowered, but mechanical vibration and noise increase due to misalignment of rotor axes
Solution Approach 1:
A third rotor is introduced as an intermediary element between the first and second rotors. This third rotor serves as a mediator that transmits rotation while maintaining proper alignment, thereby eliminating the harmful vibration and noise that would otherwise result from direct coupling of just two rotors
Solution Approach 2:
The third rotor is designed with an eccentric rotation axis relative to the first rotor's axis. This parameter change in the rotation axis position allows the third rotor to change the relative rotation phase between the first and second rotors, enabling speed variation while maintaining alignment
2Object-generated harmful factors
If three rotors are used to prevent misalignment and reduce vibration, then mechanical vibration and noise are minimized, but the device size and production cost increase
Solution Approach 1:
The second rotor is disposed inside the first rotor, and the third rotor is disposed inside the first rotor facing the second rotor. This nested arrangement allows three rotors to be compactly integrated without proportionally increasing the overall device size, making the solution more space-efficient
3Speed
If the third rotor rotates eccentrically to change relative rotation phase, then speed variation is achieved, but inclination between rotors increases causing friction and vibration
Solution Approach 1:
The flange extends in the radial direction of the second rotor, creating a constraint in a different dimensional orientation. This radial extension allows the flange to contact the outer wall of the second rotor and prevent inclination, addressing the alignment problem in a dimensional direction perpendicular to the rotation axis
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 effectively minimizes mechanical vibration and noise while allowing the eccentric speed variator to be reduced in size without increasing parts or production costs, enhancing the stability of the planetary motion and reducing frictional energy loss.
Implementation Method 1
The third rotor rotates about a rotation axis which is eccentric with respect to a rotation axis of the first rotor to change a relative rotation phase between the first rotor and the second rotor and to accelerate or decelerate the first rotor or the second rotor
Implementation Method 2
When contacting the outer wall of the second rotor, the flange serves to minimize inclination of the third rotor relative to the second rotor. When the flange contacts the outer wall of the second rotor, it produces force to attract the second and third rotor to each other
Implementation Method 3
The engaging member establishes mechanical engagement between the second rotor and the third rotor through the hole of the second rotor
Data Source
AI summary
An eccentric speed variator includes a first rotor, a second rotor, a third rotor, a cylindrical pin, and a flange. The second rotor has a hole formed therein. The third rotor rotates eccentrically to change a relative rotation phase between the first and second rotors. The cylindrical pin extends through the hole of the second rotor to establish mechanical engagement between the second and third rotors. The flange is secured to or integrally formed with an end of the cylindrical pin. In operation, when the flange contacts the outside wall of the second rotor, it serves to minimize inclination of the third rotor relative to the second rotor, thereby reducing local friction between the second and third rotors to eliminate undesirable mechanical vibration or noise. This structure also enables parts of the cycloidal speed reducer to be decreased, which leads to a reduced size of the cycloidal speed reducer.