混凝土搅拌车上面的取力器是能把混凝土搅拌车动力系统的功率传递到附加装置的齿轮组。取力器也称功率输出器，简写为PTO，是英文Power Take Off的首字母缩写。不光是混凝土搅拌车上有，比如比如自卸车的齿轮泵、搅拌机的液压马达、消防车的水泵、制冷车的压缩机等动力的连接，基本都是通过取力器来实现动力的传递。
The power take-off on the concrete mixer is a gear set that can transfer the power of the power system of the concrete mixer to the additional device. Power takeoff, also known as power output, is abbreviated as PTO, which is the acronym of power take off in English. Not only on the concrete mixer, for example, the gear pump of the dump truck, the hydraulic motor of the mixer, the water pump of the fire truck, the compressor of the refrigeration truck and other power connections are basically realized through the power take-off.
取力器分类主要是按照分类方式的不同来区分：一种是按最终功率输出形式来分；还有一种就是按取力器本身结构的档位来分。
The classification of power takeoff is mainly based on different classification methods: one is based on the final power output form; Another is to divide according to the gear of the power take-off itself.
发动机后端取力（PTO1）：发动机后端取力一般都是在飞轮处，它优点是不受主离合器控制，但因改变了曲轴未端的结构，对于平衡会有一些影响。这种取力形式的应用大家比较熟悉的就是水泥搅拌机。取力器装在离合器外壳上且在不同工况下搅拌滚筒的旋转方向不同。在进料和运输过程正向旋转，出料反向旋转，工作结束切断与发动机动力连接。

Engine rear end power take-off (pto1): the engine rear end power take-off is generally at the flywheel. Its advantage is that it is not controlled by the main clutch, but it will have some impact on the balance due to the change of the structure of the crankshaft end. The familiar application of this power taking form is the cement mixer. The power take-off is installed on the clutch housing, and the rotation direction of the mixing drum is different under different working conditions. In the process of feeding and transportation, it rotates in the forward direction, and the discharge rotates in the reverse direction. At the end of the work, it cuts off the power connection with the engine.
发动机前端取力（PTO2）通常是曲轴连接，一般都是由正时齿轮室或由风扇、水泵的皮带轮输出。例如气刹制动系统中的气泵，某些专用工作装置所用的液压马达等。由于该方式的取力器到附加装置的距离较长，且需要转换传动方向，若采用机械传动其结构就很复杂，因此一般采用液压传动。
The power take-off at the front end of the engine (PtO2) is usually connected with the crankshaft and is generally output by the timing gear chamber or the belt pulley of the fan and water pump. For example, the air pump in the air brake system, the hydraulic motor used in some special working devices, etc. Because the distance from the power take-off to the additional device is long and the transmission direction needs to be changed, if mechanical transmission is adopted, its structure is very complex, so hydraulic transmission is generally adopted.
按照取力器本身结构的档位来分的话，主要分为中置取力器和后置取力器。
According to the gear of the power take-off structure, it is mainly divided into middle power take-off and rear power take-off.

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