流体耦合（液压耦合）是通过加速和减速液压流体将从一个轴传递到另一个轴的旋转动力的流体动力装置。该机构通常用于所需的有效电力转移的地方：汽车传输，海洋推进系统，供电大型机械或泵的行业 - 它们有时用于制作自己的自制装置。
液体耦合的部分
这main parts of流体耦合包括：
Housing
Housing or shell has an oil-tight seal around the drive shaft that helps in rotation and also protects the impeller and turbine from outside damage.
Impeller or pump
这叶轮is also called a pump because it acts as a centrifugal pump, however, the turbine stays intact with the input shaft hence they are called an impeller.
As the prime movers start rotation, it also simultaneously rotates the impellers of the coupling. Thus it starts acting as a centrifugal pump and thrusts the fluid outward and sends them towards the turbine blades.
涡轮
这turbine connects the output shaft through which the rotational power is transmitted. The driving turbine is rotated by the prime mover, which is generally an internal combustion engine or electric motor.
这叶轮is attached to the prime mover (internal combustion engine) which is a power source. The turbine blade turns and rotates as it’s connected to the output shaft where rotation is needed to be transmitted. Further, the impeller and turbine are enclosed in an oil-tight locked chamber.
流体耦合的工作机制
当曲轴旋转时，它会导致叶轮旋转。它充满了油，这种离心力将流体径向推向，这使得涡轮机旋转。因此，发动机功率通过齿轮或带从曲轴转移到变速器轴，所有这些内燃的所有这些部分都在一起。随着发动机提升其速度，叶轮中除去的油以强化力撞击从动部件，然后叶轮以相同的速度旋转。在开始旋转时，它通过连接构件的油膜成为一个单个单元。当发动机停止旋转时，驱动和驱动构件之间的油膜断开并脱离。
流体耦合的应用
- 流体耦合在汽车行业中用于从一个源（发动机）到车轮的电力作为离合器的替代方案。
- 用于几种工业应用，其中需要重型启动扭矩。
- 这y are also utilized in aeronautical applications.
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