REXROTH液壓泵與力士樂液壓馬達(dá)是可逆工作的液壓元件，向任何一種液壓泵輸入工作液體，都可使其變成液壓馬達(dá)工況；反之，當(dāng)液壓馬達(dá)的主軸由外力矩驅(qū)動旋轉(zhuǎn)時，也可變?yōu)橐簤罕霉r。因為它們具有同樣的基本結(jié)構(gòu)要素--密閉而又可以周期變化的容積和相應(yīng)的配油機(jī)構(gòu)。但是，由于液壓馬達(dá)和液壓泵的工作條件不同，對它們的性能要求也不一樣，所以同類型的液壓馬達(dá)和液壓泵之間，仍存在許多差別。首先液壓馬達(dá)應(yīng)能夠正、反轉(zhuǎn)，因而要求其內(nèi)部結(jié)構(gòu)對稱；液壓馬達(dá)的轉(zhuǎn)速范圍需要足夠大，特別對它的低穩(wěn)定轉(zhuǎn)速有一定的要求。因此，它通常都采用滾動軸承或靜壓滑動軸承；其次液壓馬達(dá)由于在輸入壓力油條件下工作，因而不必具備自吸能力，但需要一定的初始密封性，才能提供必要的起動轉(zhuǎn)矩。由于存在著這些差別，使得液壓馬達(dá)和液壓泵在結(jié)構(gòu)上比較相似，但不能可逆工作。

Rexroth hydraulic pump and Rexroth hydraulic motor are reversible hydraulic components. Inputting working fluid to any kind of hydraulic pump can turn it into the working condition of hydraulic motor; On the contrary, when the main shaft of the hydraulic motor rotates driven by external torque, it can also change to the working condition of the hydraulic pump. Because they have the same basic structural elements -- closed and periodically variable volume and corresponding oil distribution mechanism. However, due to the different working conditions of hydraulic motors and pumps, their performance requirements are also different, so there are still many differences between the same type of hydraulic motors and pumps. First of all, the hydraulic motor should be able to forward and reverse, so its internal structure is required to be symmetrical; The speed range of hydraulic motor needs to be large enough, especially for its minimum stable speed. Therefore, it usually adopts rolling bearings or hydrostatic sliding bearings; Secondly, because the hydraulic motor works under the condition of input pressure oil, it does not need to have self-priming capacity, but it needs a certain initial sealing to provide the necessary starting torque. Due to these differences, the hydraulic motor and hydraulic pump are similar in structure, but they cannot work reversibly.