Planetary Gear Carrier Stiffness Balancing for Gear Alignment
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Solution Overview
Problem
In planetary gear reduction devices with a rotatable carrier, misalignment occurs due to torque reaction forces and centrifugal forces, leading to tilting of planetary pins and misalignment of gears.
Innovation Solution
The device is designed with a carrier having equal stiffness in two regions for twist forces and equal radial tensile force stiffness in the front and rear plates, with a flexible structure in the front plate to balance torque reactions and centrifugal forces, preventing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the carrier is made with equal stiffness in both regions to prevent twist deformation, then misalignment due to torque is reduced, but the front plate becomes too stiff and cannot accommodate centrifugal force deformation
Solution Approach 1:
The front plate is designed with different local stiffness characteristics: the inner region (near the rotation axis) has high stiffness to resist radial tensile deformation from centrifugal force, while the outer region has lower stiffness to allow controlled deformation that balances torque reaction forces. This local differentiation resolves the contradiction between preventing twist deformation and accommodating centrifugal force effects.
Solution Approach 2:
The front plate employs an asymmetric thickness distribution, being thicker in the inner region and thinner in the outer region. This asymmetric structure creates different stiffness characteristics in different areas, allowing the plate to simultaneously resist radial tensile deformation near the center while permitting controlled deformation at the periphery to balance torque reactions, thus resolving the contradiction between twist prevention and centrifugal force accommodation.
2Stability of the object's composition
If the front plate stiffness is reduced to accommodate centrifugal force, then radial tensile deformation is reduced, but twist deformation increases due to torque reaction force
Solution Approach 1:
The front plate incorporates regions with different stiffness properties: the inner region maintains high stiffness to resist radial tensile deformation from centrifugal force, while the outer region has reduced stiffness to allow controlled deformation that balances torque reaction forces. This local differentiation resolves the contradiction between preventing twist deformation and accommodating centrifugal force effects.
Solution Approach 2:
The front plate employs an asymmetric thickness distribution, being thicker in the inner region and thinner in the outer region. This asymmetric structure creates different stiffness characteristics in different areas, allowing the plate to simultaneously resist radial tensile deformation near the center while permitting controlled deformation at the periphery to balance torque reactions, thus resolving the contradiction between twist prevention and centrifugal force accommodation.
3Manufacturing precision
If the output frame is connected closer to the front plate to reduce torque reaction force, then twist deformation is reduced, but the front plate experiences increased radial tensile deformation from centrifugal force
Solution Approach 1:
The front plate is designed with different local stiffness characteristics: the inner region (near the rotation axis) has high stiffness to resist radial tensile deformation from centrifugal force, while the outer region has lower stiffness to allow controlled deformation that balances torque reaction forces. This local differentiation resolves the contradiction between preventing twist deformation and accommodating centrifugal force effects.
Solution Approach 2:
The front plate employs an asymmetric thickness distribution, being thicker in the inner region and thinner in the outer region. This asymmetric structure creates different stiffness characteristics in different areas, allowing the plate to simultaneously resist radial tensile deformation near the center while permitting controlled deformation at the periphery to balance torque reactions, thus resolving the contradiction between twist prevention and centrifugal force accommodation.
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 prevents misalignment due to torque and centrifugal forces, maintaining precise gear alignment even at high rotational speeds.
Implementation Method 1
a centrifugal force of the planetary gears and the planetary pins is applied to the carrier
Implementation Method 2
imbalanced twist deformation may occur in the carrier due to a torque reaction force
Implementation Method 3
imbalanced twist deformation may occur in the carrier
Implementation Method 4
radially outward tensile deformation of the front plate occurs
Data Source
AI summary
An output frame is connected to a portion of a radially outer portion of a carrier, the portion being closer to a front plate than to a rear plate. The carrier has a first region as an external force transmission path between front pin support surfaces and the output frame, and a second region as the external for transmission path between rear shaft support surfaces and the output frame, and a stiffness with respect to a twist force of the first region and a stiffness with respect to the twist force of the second region are equal to each other. In the front plate and the rear plate, a stiffness with respect to a radial tensile force applied to the front pin support surfaces and a stiffness with respect to the radial tensile force applied to the rear shaft support surfaces are equal to each other.