(1)液壓泵在結(jié)構(gòu)上需保證具有自吸能力，而液壓馬達(dá)就沒有這一要求。

(1) The structure of the hydraulic pump needs to ensure that it has self-priming capacity, but the hydraulic motor does not have this requirement.

(2)葉片泵依靠葉片跟轉(zhuǎn)子一起高速旋轉(zhuǎn)而產(chǎn)生的離心力使葉片始終貼緊定子的內(nèi)表面，起封油作用，形成工作容積。若將其當(dāng)馬達(dá)用，必須在液壓馬達(dá)的葉片根部裝上彈簧，以保證葉片始終貼緊定子內(nèi)表面，以便馬達(dá)能正常起動。

(2) The vane pump relies on the centrifugal force generated by the high-speed rotation of the vane and the rotor, which makes the vane always close to the inner surface of the stator, plays the role of sealing oil, and forms the working volume. If it is used as a motor, a spring must be installed at the root of the blade of thehydraulic motor to ensure that the blade is always close to the inner surface of the stator, so that the motor can start normally.

(3)液壓馬達(dá)要求能在很寬的轉(zhuǎn)速范圍內(nèi)正常工作，因此，應(yīng)采用液動軸承或靜承。因?yàn)楫?dāng)馬達(dá)速度很低時，若采用動承，就不易形成潤滑滑膜。

(3) Hydraulic motor is required to work normally in a wide speed range, so hydraulic bearing or hydrostatic bearing should be used. Because when the motor speed is very low, if the use of dynamic bearing, it is not easy to form lubricating film.

(4)為了減小吸油阻力，減小徑向力，一般液壓泵的吸油口比出油口的尺寸大。而液壓馬達(dá)低壓腔的壓力稍高于大氣壓力，所以沒有上述要求。

(4) In order to reduce the suction resistance and radial force, the suction port of hydraulic pump is larger than the outlet port. The pressure of the low pressure chamber of the hydraulic motor is slightly higher than the atmospheric pressure, so there is no such requirement.

(5)液壓馬達(dá)一般需要正反轉(zhuǎn)，所以在內(nèi)部結(jié)構(gòu)上應(yīng)具有對稱性，而液壓泵一般是單方向旋轉(zhuǎn)的

沒有這一要求。
(5) The hydraulic motor generally needs forward and reverse rotation, so it should have symmetry in the internal structure, while the hydraulic pump generally rotates in one direction, so there is no such requirement.

(6)液壓馬達(dá)必須具有較大的起動扭矩。由于液壓馬達(dá)與液壓泵具有上述不同的特點(diǎn)，使得很多類型的液壓馬達(dá)和液壓泵不能互逆使用。

(6) The hydraulic motor must have a large starting torque. Due to the above different characteristics of hydraulic motor and hydraulic pump, many types of hydraulic motor and hydraulic pump can not be used in reverse.