威格士3520V-25A9/30A9/35A9/38A9-1AA-22R葉片泵外形尺寸相對小，這些代號業經證實能為所列產品 ( 無論哪家制造商的 ) 提供長而***的使用壽命。液壓系統中的油液起著流體傳動、元件潤滑和冷卻的多重功能。它們在液壓系統中的關鍵作用是必須滿足工作條件和***元件的壽命。液壓系統對***的石油基液壓油的基本要求是：1. 足夠的抗磨添加劑2. 在工作溫度下有正確的黏度3. 充分的防腐和防氧化能力從---廠商處得到***油液提供這些性能。兩種***的油液滿足現代液壓系統的要求：·抗磨型液壓油，根據 astm-d-2882 的泵磨損試驗。·汽車曲軸油箱，按照 sae j183 jun89標記 "sc"，"sd"，"se"，"sf" 或 "sg"。有關正確的黏度和正確選擇液壓系統油液的進一步資料，參考樣本 694。
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威格士3520V-25A9/30A9/35A9/38A9-1AA-22R葉片泵外形尺寸相對小，在葉片、轉子、定子與配流盤之間構成若干密封空間。當葉片從小半徑曲線段向大半徑曲線滑動時，葉片外伸,這時所構成的密封容積由小變大，形成部分真空，油液便經吸油窗口吸入;而處于從大半徑曲線段向小半徑曲線滑動的葉片縮回，所構成的密封容積由大變小，其中的油液受到擠壓，經過壓油窗口壓出這種葉片泵每轉-一周，每個密封容腔完成兩次吸、壓油過程，故這種泵稱為雙作用葉片泵。同時，泵中兩吸油區和兩壓油區各自對稱，使作用在轉子.上的徑向液壓力互相平衡，所以這種泵又被稱為平衡式葉片泵或雙作用卸荷式葉片泵。這種泵的排量不可調，因此它是定量泵。2.雙作用葉片泵排量和流量圖可知，泵軸轉-轉時，從吸油窗口流向壓油窗口的液體體積為大半徑為r，小半徑為r,寬度為b的圓環的體積。因為是雙作用泵，所以雙作用葉片泵的排量為葉片體積對排量無影響。因為在壓油腔，葉片縮回排出的液體體積補償了葉片在壓油腔所占的體積。
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