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What is Fluid Flywheel

液体飞轮

It is also known as Fluid clutch or fluid coupling which couples the driving member with the driven member through a media of fluid. It consists of two members in which one is a driving member and the other one is driven member as shown in Figure. Among them, the driving member is connected with the engine flywheel and the driven member is connected with the transmission shaft. These two members are not made to contact with each other. The driven member is free to slide on splines provided on the transmission shaft. The two rotors are filled with a fluid of required viscosity. Radial ribs are provided to form a number of passages to avoid the formation of eddies. They also guide the fluid to flow in the desired direction.

Fluid Flywheel Diagram :

When the engine is started, the driving member called the impeller starts to move inside the housing containing oil. Pockets of moving driving members are completely filled with oil. Due to this, the centrifugal force forces the oil outward radially. The pockets are designed in such a way that the splashed oil will strike the pockets or vanes of the driven member. Hence. it is forced to move in the same direction. When the engine speed increases. the oil which is coming out from the pocket of the driving member strikes the pockets of the driven member有更大的力量。因此，它倾向于以相同的速度旋转的从动构件。

Characteristics of a Fluid Flywheel:

失速速度停顿速度被定义为泵在输出涡轮机被锁定时泵转动的最高速度并且施加最大输入电源。在摊位条件下，所有发动机的电源都将在流体耦合为热量的情况下消散，可能导致损坏。
仅当液体耦合的效率最高时，滑动速率速度几乎等于叶轮的速度。但通常跑步者速度小于叶轮的速度。叶轮后面的跑步者的（速度）滞后称为滑动。这种（速度）滑移随着发动机速度，车速和发动机和车辆负载等许多因素而变化。
Slip is given as (N1-N2)/N1 where N1, N2 are speed of driving and driven

Advantages of Fluid Flywheel :

1. It gives smoother power take-up than the centrifugal type when the engine IS accelerated.
2. The fluid in the coupling behaves as a cushioning agent between engine and gearbox in order to absorb shocks during braking or coasting down on incline.
3. No need of separate pedal or lever to operate.
驱动构件用作曲轴上的飞轮。因此。它被平滑为扭矩变化。
5. There is no wear on moving parts.
6.不需要调整。
7.无需维护。除了维持所需的石油水平。
这是简单的设计。
9. There is no jerk on transmission when the gear engages. It damps all shocks and strains.
10. No skill is required for operating.
11. Car can be stopped in gear and moved off just by pressing the accelerator pedal itself.

Disadvantages Of Fluid Flywheel :

1. There is a drag on the gear box-shaft even the slip is 100%.
2. It has the gear changing difficult with the ordinary crash type gearbox. So. the fluid flywheel is generally used with an epicyclic gearbox which avoids this difficulty.

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