Fluid Transmission Device Lock-Up Clutch Damping Mechanism
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Solution Overview
Problem
Existing fluid transmission devices with lock-up clutches impair the increase in rotational speed of the second rotating element when the lock-up clutch is released, due to the mass of the dynamic damper acting on the second rotating element.
Innovation Solution
A fluid transmission device with a first damping mechanism and a coupling mechanism that separates the damping mechanism from the rotating elements when the lock-up clutch is released and couples it when engaged, using a movable element, friction members, and a dynamic damper with a ring and mass body to restrain rotation variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the dynamic damper is mounted on the second rotating element, then variations in rotation of the second rotating element are restrained, but the increase in rotational speed of the second rotating element is impaired when the lock-up clutch is released
Solution Approach 1:
The patent applies the dynamics principle by making the mounting state of the dynamic damper changeable. The dynamic damper can be selectively mounted on or dismounted from the second rotating element based on the engagement state of the lock-up clutch. When the lock-up clutch is engaged, the dynamic damper is mounted to restrain rotation variations. When the lock-up clutch is released, the dynamic damper is dismounted to avoid impairing rotational speed increase. This dynamic configuration allows the system to adapt its damping characteristics to different operational modes.
2Power
If the lock-up clutch is engaged to transmit power directly, then power transmission efficiency is improved, but the mass of the dynamic damper acts on the second rotating element causing impairment of speed increase
Solution Approach 1:
The patent applies the segmentation principle by dividing the operational modes into distinct states based on lock-up clutch engagement. The system segments the power transmission path into two modes: when the lock-up clutch is engaged, power is transmitted directly with the dynamic damper active; when released, power is transmitted through the torque converter with the dynamic damper inactive. This segmentation allows the system to optimize for either power transmission efficiency or speed increase capability depending on the operational requirements.
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
The solution effectively prevents impairment of rotational speed increase and reduces variations in the second rotating element's rotation, enhancing acceleration and reducing fuel consumption and noise, while maintaining a compact design and low manufacturing costs.
Implementation Method 1
a dynamic damper mounted on the first plate. The dynamic damper includes a hub flange mounted on the first plate, a second torsion spring disposed between the hub flange and the first plate, and an inertia member fixed to an outer peripheral end of the hub flange
Implementation Method 2
a first torsion spring that transmits power between the piston and the first plate
Implementation Method 3
a piston moves toward the engine side by a hydraulic pressure, and a friction member is pressed against the front cover
Implementation Method 4
a friction member is pressed against the front cover. In other words, the lock-up clutch is engaged, the piston rotates integrally with the front cover, and the power is transmitted from the front cover to the turbine hub via the piston and the first torsion spring
Data Source
AI summary
A fluid transmission device is capable of transmitting power between a first rotating element and a second rotating element by kinetic energy of a fluid and capable of transmitting power between the first rotating element and the second rotating element via a lock-up clutch. The device includes a first damping mechanism and a coupling mechanism. The first damping mechanism is disposed in a path for transmitting power between the first rotating element and the second rotating element via a lock-up clutch for restraining variations in rotation of the second rotating element. The coupling mechanism is configured to release the first damping mechanism from the first rotating element and the second rotating element when the lock-up clutch is released and couple the first damping mechanism to the first rotating element and the second rotating element when the lock-up clutch is engaged.