Damped Planetary Transmission Vibration Isolator
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Solution Overview
Problem
Existing planetary transmissions with vibration isolators between the crankshaft and planetary gear carrier increase complexity and manufacturing costs, and do not effectively address torsional vibrations impacting the one-way clutch.
Innovation Solution
A damped planetary transmission with a vibration isolator directly connected for torque flow between the input member and the one-way clutch, utilizing an elastomeric member to absorb and damp torsional vibrations, thereby extending the life of the one-way clutch without decoupling the carrier from the crankshaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vibration isolator is disposed between the crankshaft and the planetary gear carrier, then torsional vibrations are damped, but the complexity and size of the transmission increases
Solution Approach 1:
The patent extracts the vibration isolation function from the traditional location (between crankshaft and planetary gear carrier) and relocates it to a new position (between input member and one-way clutch). This allows the vibration isolator to specifically target torsional vibrations affecting the one-way clutch without requiring the entire transmission system to be redesigned, thereby reducing overall complexity while maintaining vibration damping effectiveness.
Solution Approach 2:
The vibration isolator serves as an intermediary element positioned between the input member and the one-way clutch. It mediates the torque transmission while filtering out torsional vibrations, protecting the one-way clutch from vibration-related damage. This intermediary approach allows vibration damping without directly modifying the planetary gear carrier or crankshaft connection.
2Object-affected harmful factors
If a vibration isolator is disposed between the crankshaft and the planetary gear carrier, then torsional vibrations are damped, but manufacturing costs increase
Solution Approach 1:
The patent extracts the vibration isolation function from the complex planetary gear carrier assembly and places it in the input member assembly where it can be integrated more simply. This relocation reduces manufacturing complexity and associated costs while maintaining the vibration damping function.
Solution Approach 2:
The vibration isolator is implemented as a relatively simple elastomeric component that can be easily manufactured and replaced if necessary. By using a simpler, more cost-effective vibration isolation component in the new location, the overall manufacturing cost is reduced compared to more complex vibration isolation solutions that would be required in traditional locations.
3Object-affected harmful factors
If the vibration isolator is positioned between the crankshaft and planetary gear carrier, then vibrations are isolated, but the one-way clutch remains affected by torsional vibrations
Solution Approach 1:
The vibration isolator is positioned as an intermediary between the input member and the one-way clutch, directly protecting the one-way clutch from torsional vibrations. This placement ensures that the protective function is applied exactly where needed (at the one-way clutch interface) rather than at a remote location that doesn't adequately protect the clutch.
Solution Approach 2:
The patent applies vibration isolation locally at the critical interface between the input member and the one-way clutch, rather than attempting to isolate vibrations at the crankshaft level. This localized approach ensures that the one-way clutch specifically receives protection from torsional vibrations, addressing the reliability concern directly at the component level where it matters most.
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 reduces torsional vibrations transmitted to the one-way clutch, extending its lifespan and maintaining efficient torque transmission, while maintaining a compact design and reducing manufacturing costs.
Implementation Method 1
a vibration isolator directly connected for torque flow between the input member and the one-way clutch
Implementation Method 2
utilizing an elastomeric member to absorb and damp torsional vibrations
Data Source
Figure 1
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AI summary
A damped planetary transmission (100) comprising an input member (13), an inertial member (12) connected to the input member (13), a planetary gear assembly connected to the input member (13), the planetary gear assembly comprising a carrier member (13a) that is directly and fixedly connected to the input member (13), a brake member (24) engaged with a ring gear (16) of the planetary gear assembly, the planetary gear assembly connected to an output member (19), a one-way clutch (22) operationally disposed between the input member (13) and the output member (19), and a vibration isolator (23) directly connected for torque flow between the input member (13) and the one-way clutch (22).