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選(xuan)用(yong)(yong)船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)馬(ma)(ma)達通常是(shi)(shi)(shi)根(gen)據馬(ma)(ma)達的(de)(de)(de)扭(niu)矩、轉速(su)(su)、安(an)裝尺(chi)寸(cun)和液(ye)壓(ya)(ya)系(xi)統(tong)(tong)的(de)(de)(de)大(da)(da)(da)工作(zuo)(zuo)壓(ya)(ya)力(li)等參數決(jue)定(ding)的(de)(de)(de)。由于船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)馬(ma)(ma)達在(zai)系(xi)統(tong)(tong)中屬于執(zhi)行元件, 因此往往是(shi)(shi)(shi)帶負載起動(dong), 即在(zai)負載扭(niu)矩大(da)(da)(da)狀態下(xia)起動(dong)。而(er)船(chuan)舶機械大(da)(da)(da)多是(shi)(shi)(shi)大(da)(da)(da)功率(lv)負載, 如果(guo)船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)馬(ma)(ma)達沒有足夠大(da)(da)(da)的(de)(de)(de)起動(dong)力(li)矩是(shi)(shi)(shi)無法正常工作(zuo)(zuo)的(de)(de)(de)。并且(qie), 為了(le)縮小系(xi)統(tong)(tong)體積, 提高系(xi)統(tong)(tong)工作(zuo)(zuo)可(ke)靠度(du), 船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)馬(ma)(ma)達經常與低(di)速(su)(su)工作(zuo)(zuo)機構直接連接, 因此船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)馬(ma)(ma)達要(yao)求具有大(da)(da)(da)的(de)(de)(de)起動(dong)扭(niu)矩、很(hen)寬的(de)(de)(de)速(su)(su)度(du)范圍(wei)和良好的(de)(de)(de)低(di)速(su)(su)穩(wen)定(ding)性(xing)。考慮到船(chuan)舶液(ye)壓(ya)(ya)系(xi)統(tong)(tong)的(de)(de)(de)惡劣工作(zuo)(zuo)環境(jing), 為滿足船(chuan)舶機械的(de)(de)(de)負載特點(dian)和工作(zuo)(zuo)要(yao)求, 并且(qie)系(xi)統(tong)(tong)有較高的(de)(de)(de)可(ke)靠度(du), 船(chuan)舶液(ye)壓(ya)(ya)系(xi)統(tong)(tong)一般均選(xuan)擇增大(da)(da)(da)馬(ma)(ma)達排(pai)量的(de)(de)(de)方法以實(shi)現(xian)船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)馬(ma)(ma)達的(de)(de)(de)大(da)(da)(da)輸出扭(niu)矩