Pendulum Damper Roller Retention With Connecting Spacers
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Solution Overview
Problem
Existing pendular damping devices face issues with guide roller loss due to centrifugal force at high rotational speeds, leading to separation of annular sheets and reduced operational efficiency, particularly in manual gearboxes.
Innovation Solution
The introduction of connecting spacers, such as cylindrical grooves or elastic sleeves, that pass through pendular masses and cooperate with guide rollers to prevent lateral separation, combined with axial stop means like external flanges to maintain sheet alignment, reduces inertia while ensuring stability at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of annular sheets is increased to prevent guide roller loss at high speed, then reliability is improved, but device complexity and inertia increase
Solution Approach 1:
Connecting spacers are introduced as intermediary elements between the annular sheets and guide rollers. These spacers pass through the pendular masses and engage with the guide rollers to provide lateral support and prevent guide roller loss, thereby maintaining reliability without increasing the thickness of the annular sheets themselves.
Solution Approach 2:
The support structure is segmented into multiple components: thin annular sheets, connecting spacers, and pendular masses with slots. This segmentation allows each component to perform its specific function optimally - the sheets provide structural framework, the spacers provide lateral support, and the masses provide damping functionality - without requiring any single component to be overly thick or complex.
2Reliability
If the number of spacers between annular plates is increased to prevent separation, then reliability is improved, but device complexity and inertia increase
Solution Approach 1:
The connecting spacers serve multiple functions simultaneously: they connect the annular sheets together to prevent separation, they engage with the guide rollers to prevent lateral loss, and they pass through the pendular masses to integrate the damping elements into the overall structure. This multi-functionality reduces the need for separate components for each function.
Solution Approach 2:
The invention merges the functions of sheet connection and guide roller retention into a single connecting spacer component. By combining these functions, the design avoids the need for separate spacers for each purpose, thereby reducing overall device complexity while maintaining reliability.
3Productivity
If annular sheets are made thinner to reduce inertia, then productivity is improved, but guide rollers may be lost at high speed
Solution Approach 1:
Connecting spacers act as intermediary support elements that compensate for the reduced structural strength of thinner annular sheets. These spacers provide the necessary lateral support to retain guide rollers at high speeds, enabling the use of thinner sheets without sacrificing reliability.
Solution Approach 2:
The invention changes the structural parameters by introducing additional support elements (connecting spacers) rather than increasing the thickness parameter of the annular sheets. This allows the sheets to remain thin for reduced inertia while the spacer parameter provides the necessary support for guide roller retention at high rotational speeds.
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 guide roller loss and maintains sheet alignment at high rotational speeds, optimizing the pendular damping device's performance and reducing the risk of separation, even at speeds up to 15,000 rpm.
Implementation Method 1
each mass moves in such a way that its center of gravity oscillates in a pendulum fashion. The frequency of oscillation of each mass is proportional to the speed of rotation of the motor shaft
Implementation Method 2
Guide rollers, the middle part of which rolls inside the oblong holes of the pendulum masses, and the ends of which roll in the oblong openings
Implementation Method 3
To avoid loss of the guide rollers by a lateral separation of the annular plates under the effect of centrifugal force
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
Pendulum damping device (1, 14) comprising: - an annular support (2, 4) formed by two annular metal sheets (2) rotated about an axis of a transmission; - pendulum masses (5, 16) movably mounted between said annular metal sheets (2) on the periphery, being in the general shape of a circular segment and each comprising a pair of oblong holes (8); - guide rollers (6) having a median part (7) rolling inside said oblong holes (8), and ends (9) rolling in oblong openings (10) formed in said annular metal sheets (2) facing said oblong holes (8); - means (11) for axially holding said guide rollers (6) between said annular metal sheets; - link means (12, 13, 15) between said annular metal sheets and comprising a link spacer (15) passing through one of said pendulum masses (16).