YUKEN油研創立于1956年總部位于日本神奈川縣，日本液壓設備的生產廠家，其產品包括YUKEN油泵、YUKEN柱塞泵、YUKEN葉片泵、油研雙聯泵、油研液壓泵、油研液壓閥、油研電磁閥、油研伺服閥、油研液壓系統、油研液壓元件和液壓設備等，產品主要使用于加工中心、液壓電梯、數控機床、自動精密機床以及進口的關鍵設備。

柱塞泵是通過柱塞桿在氣缸內做往復運動，從而產生壓力差來輸入流體的。柱塞泵柱塞往復運動總行程L是不變的，由凸輪的升程決定。柱塞每循環的供油量大小取決于供油行程,供油行程不受凸輪軸控制是可變的。供油開始時刻不隨供油行程的變化而變化。轉動柱塞可改變供油終了時刻，從而改變供油量。柱塞泵工作時，在噴油泵凸輪軸上的凸輪與柱塞彈簧的作用下，迫使柱塞作上、下往復運動，從而完成泵油任務，泵油過程可分為進油過程和回油過程兩個階段

　　主銷產品為日本油研葉片泵PV2R1、PV2R2、PV2R3、PV2R4、50T、150T系列油研單聯泵;PV2R12、PV2R13、PV2R14、PV2R23、PV2R24、PV2R33、PV2R34系列油研雙聯泵;日本油研柱塞泵AR16、 AR22、A10、A16、A22、A37、A40、A45、A56、A70、A80、A90、A125、A145等系列。油研壓力控制閥，流量控制閥，方向控制閥，疊加閥，插裝閥，電-液比例控制閥，伺服閥。執行元件，液壓裝置液壓站，其它輔助元件等各類液壓產品。

 YUKEN低壓變量葉片泵

SVPF系列型號如下:

SVPF-12-70-20,SVPF-12-35-20,SVPF-12-55-20,SVPF-12-20-20

SVPF-15-70-20,SVPF-15-35-20,SVPF-15-55-20,SVPF-15-20-20

SVPF-20-70-20,SVPF-20-35-20,SVPF-20-55-20,SVPF-20-20-20

SVPF-30-70-20,SVPF-30-35-20,SVPF-30-55-20,SVPF-30-20-20

SVPF-40-70-20,SVPF-40-35-20,SVPF-40-55-20,SVPF-40-20-20

A10-FR01B-12,A10-FR01C-12,A10-FR01H-12,

A70-FR01BS-60,A70-FR01CS-60,A70-FR01HS-60,A70-FR01KS-60,

A90-FR01BS-60,A90-FR01CS-60,A90-FR01HS-60,A90-FR01KS-60,

A145-FR01BS-60,A145-FR01CS-60,A145-FR01HS-60,A145-FR01KS-60,

A16-F-R-01-B-K-32,A16-F-R-01-C-K-32,A16-F-R-01-H-K-32,

A22-F-R-01-B-K-32,A22-F-R-01-C-K-32,

A37-F-R-01-B-K-32,A37-F-R-01-C-K-32,A37-F-R-01-H-K-32,

A56-F-R-01-B-K-32,A56-F-R-01-C-K-32,A56-F-R-01-H-K-32,

A220-F-R-01-B-S-60,A220-F-R-01-C-S-60,A220-F-R-01-H-S-60,A220-F-R-01-K-S-60. 

A125-F-R-01-B-S-60,A125-F-R-01-C-S-60,A125-F-R-01-H-S-60,A125-F-R-01-K-S-60.

A16-F-R-01-B-S-K-32,A16-F-R-01-C-S-K-32,A16-F-R-01-H-S-K-32,

A22-F-R-01-B-S-K-32,A22-F-R-01-C-S-K-32,

A37-F-R-01-B-S-K-32,A37-F-R-01-C-S-K-32,A37-F-R-01-H-S-K-32,

A56-F-R-01-B-S-K-32,A56-F-R-01-C-S-K-32,A56-F-R-01-H-S-K-32,

A70-LR01BS-60,A70-LR01CS-60,A70-LR01HS-60,A70-LR01KS-60,

A90-LR01BS-60,A90-LR01CS-60,A90-LR01HS-60,A90-LR01KS-60,

A145-LR01BS-60,A145-LR01CS-60,A145-LR01HS-60,A145-LR01KS-60,

A16-L-R-01-B-K-32,A16-L-R-01-C-K-32,A16-L-R-01-H-K-32,

A22-L-R-01-B-K-32,A22-L-R-01-C-K-32,

A37-L-R-01-B-K-32,A37-L-R-01-C-K-32,A37-L-R-01-H-K-32,

A56-L-R-01-B-K-32,A56-L-R-01-C-K-32,A56-L-R-01-H-K-32,

A220-L-R-01-B-S-60,A220-L-R-01-C-S-60,A220-L-R-01-H-S-60,A220-L-R-01-K-S-60. 

A125-L-R-01-B-S-60,A125-L-R-01-C-S-60,A125-L-R-01-H-S-60,A125-L-R-01-K-S-60.

A16-L-R-01-B-S-K-32,A16-L-R-01-C-S-K-32,A16-L-R-01-H-S-K-32,

A22-L-R-01-B-S-K-32,A22-L-R-01-C-S-K-32,

A37-L-R-01-B-S-K-32,A37-L-R-01-C-S-K-32,A37-L-R-01-H-S-K-32,

A56-L-R-01-B-S-K-32,A56-L-R-01-C-S-K-32,A56-L-R-01-H-S-K-32,

A系列變量柱塞泵雙壓控制型.

A70-FR02BS-60,A70-FR02CS-60,A70-FR02HS-60,A70-FR02KS-60,

A90-FR02BS-60,A90-FR02CS-60,A90-FR02HS-60,A90-FR02KS-60,

A145-FR02BS-60,A145-FR02CS-60,A145-FR02HS-60,A145-FR02KS-60,

A16-F-R-02-B-K-32,A16-F-R-02-C-K-32,A16-F-R-02-H-K-32,

A22-F-R-02-B-K-32,A22-F-R-02-C-K-32,

A37-F-R-02-B-K-32,A37-F-R-02-C-K-32,A37-F-R-02-H-K-32,

A56-F-R-02-B-K-32,A56-F-R-02-C-K-32,A56-F-R-02-H-K-32,

A16-F-R-02-B-S-K-32,A16-F-R-02-C-S-K-32,A16-F-R-02-H-S-K-32,

A22-F-R-02-B-S-K-32,A22-F-R-02-C-S-K-32,

A37-F-R-02-B-S-K-32,A37-F-R-02-C-S-K-32,A37-F-R-02-H-S-K-32,

A56-F-R-02-B-S-K-32,A56-F-R-02-C-S-K-32,A56-F-R-02-H-S-K-32,

A70-LR02BS-60,A70-LR02CS-60,A70-LR02HS-60,A70-LR02KS-60,

A90-LR02BS-60,A90-LR02CS-60,A90-LR02HS-60,A90-LR02KS-60,

A145-LR02BS-60,A145-LR02CS-60,A145-LR02HS-60,A145-LR02KS-60,

A16-L-R-02-B-K-32,A16-L-R-02-C-K-32,A16-L-R-02-H-K-32,

A22-L-R-02-B-K-32,A22-L-R-02-C-K-32,

A37-L-R-02-B-K-32,A37-L-R-02-C-K-32,A37-L-R-02-H-K-32,

A56-L-R-02-B-K-32,A56-L-R-02-C-K-32,A56-L-R-02-H-K-32,

A16-L-R-02-B-S-K-32,A16-L-R-02-C-S-K-32,A16-L-R-02-H-S-K-32,

A22-L-R-02-B-S-K-32,A22-L-R-02-C-S-K-32,

A37-L-R-02-B-S-K-32,A37-L-R-02-C-S-K-32,A37-L-R-02-H-S-K-32,

A56-L-R-02-B-S-K-32,A56-L-R-02-C-S-K-32,A56-L-R-02-H-S-K-32,

A系列變量柱塞泵帶卸荷壓力補償控制型.

A70-FR03BS-60,A70-FR03CS-60,A70-FR03HS-60,A70-FR03KS-60,

A90-FR03BS-60,A90-FR03CS-60,A90-FR03HS-60,A90-FR03KS-60,

A145-FR03BS-60,A145-FR03CS-60,A145-FR03HS-60,A145-FR03KS-60,

A16-F-R-03-B-K-32,A16-F-R-03-C-K-32,A16-F-R-03-H-K-32,

A22-F-R-03-B-K-32,A22-F-R-03-C-K-32,

A37-F-R-03-B-K-32,A37-F-R-03-C-K-32,A37-F-R-03-H-K-32,

A56-F-R-03-B-K-32,A56-F-R-03-C-K-32,A56-F-R-03-H-K-32,

A16-F-R-03-B-S-K-32,A16-F-R-03-C-S-K-32,A16-F-R-03-H-S-K-32,

A22-F-R-03-B-S-K-32,A22-F-R-03-C-S-K-32,

A37-F-R-03-B-S-K-32,A37-F-R-03-C-S-K-32,A37-F-R-03-H-S-K-32,

A56-F-R-03-B-S-K-32,A56-F-R-03-C-S-K-32,A56-F-R-03-H-S-K-32,

A70-LR03BS-60,A70-LR03CS-60,A70-LR03HS-60,A70-LR03KS-60,

A90-LR03BS-60,A90-LR03CS-60,A90-LR03HS-60,A90-LR03KS-60,

A145-LR03BS-60,A145-LR03CS-60,A145-LR03HS-60,A145-LR03KS-60,

A16-L-R-03-B-K-32,A16-L-R-03-C-K-32,A16-L-R-03-H-K-32,

A22-L-R-03-B-K-32,A22-L-R-03-C-K-32,

A37-L-R-03-B-K-32,A37-L-R-03-C-K-32,A37-L-R-03-H-K-32,

A56-L-R-03-B-K-32,A56-L-R-03-C-K-32,A56-L-R-03-H-K-32,

A16-L-R-03-B-S-K-32,A16-L-R-03-C-S-K-32,A16-L-R-03-H-S-K-32,

A22-L-R-03-B-S-K-32,A22-L-R-03-C-S-K-32,

A37-L-R-03-B-S-K-32,A37-L-R-03-C-S-K-32,A37-L-R-03-H-S-K-32,

A56-L-R-03-B-S-K-32,A56-L-R-03-C-S-K-32,A56-L-R-03-H-S-K-32,

 有人說這是液壓馬達，有人指出這是柱塞泵。之所以出現混淆，主要是軸向柱塞馬達的結構形式基本上與軸向柱塞泵一樣。從原理上講，液壓馬達和液壓泵是可逆的，如果用電動機帶動時，輸出的是壓力能（壓力和流量）這就是液壓泵；若輸入壓力油，輸出的是機械能（轉矩和轉速），則變成了液壓馬達。這就好比發電機和電動機的關系。