东风拖拉机液压泵流量是多少

2025-04-03 03:00:35
推荐回答(2个)
回答1:

如果是定量泵,流量是固定的只能提高发动机转速或者更换大排量液压泵

回答2:

1.旋转无力
原因是:主泵输出压力和流量不足或液压马达内部配合件间隙增大。
检查与排除方法:
(1)在主回路安全阀、过载阀和其他附件完好的前提下,将进油管与马达接口封死(不得漏油),在马达正、反转时测定供油油路的最大压力;然后接通马达管路,测定有负载时压力;最后将测定值与其技术要求相比较即可判定故障部位。
(2)因为液压泵流量不足或压力低均会使马达输出功率下降、转矩和转速同时降低,因此测定流量应与测定压力同步进行。
(3)检查配流轴和转子孔的间隙是否在允许范围内(见附表1),检查配流轴和缸体孔的旋转中心线是否一致,如超出允许值应重新装配。若出现配流轴与转子孔的配合间隙超过0.6mm,或转子内配流孔沿周向出现拉槽;柱塞与转子配合间隙超过0.05mm,滚轮方轴与滑槽配合间隙超过0.05mm时,均会使低速大扭矩内曲线马达转动无力。若两只行走马达不同步,则将使履带跑偏。
附表1
(4)斜盘式轴向柱塞马达,经长期高速运转,马达输出轴支承轴承间隙会增大,轴向定位间隙超过碟形大弹簧补偿值;缸体(转子)与配流盘间由于中心定位杆上4片碟形弹簧不能正常地将转子缸压向配流盘(碟簧疲劳强度降低,弹力下降时,在冷态下马达能正常运转,热态下碟簧变形会加大),导致配流能力下降,造成马达运转无力。当转子与缸孔间隙超过0.05mm,或磨损超过正常值时,均会引起马达无力和运转缓慢。
2.泄漏
原因可能是:配流盘(配流孔)磨损或拉伤,柱塞孔和柱塞磨损,使高低压腔间密封不良,工作腔难以形成高压,导致进油量不足;泄漏量与马达进出口压差、油黏度、排量和配流结构及加工装配质量等有关,泄漏量不稳定会引起马达转速不稳、抖动或时转时停;泄油管路回油不畅,促进低压油压力提高,导致骨架油封密封效果下降,使油液从马达输出轴端向减速器壳(或制动器内)泄漏;马达输出轴支承轴承损坏,会产生偏心泄漏、异响;内泄将引起马达闭锁制动性能下降,不能准确地停在某一位置,会使挖掘机产生滑移,极不安全。
检查与排除方法:是检查配油轴或缸体孔内表面是否划伤,先清洗,严重者应更换;检查柱塞和柱塞孔配合面时若有拉毛、沟槽,研磨、抛光配合面后再配磨,严重者更换;检查柱塞和柱塞孔配合面间隙是否太大(一般应为柱塞直径的8%以内),必要时更换;高速马达内泄漏,可通过拆检马达泄油管,在空转和负载时分别测定壳体单位时间漏油量以确定故障程度。
3.爬行
原因可能是:泄漏量不稳定、马达支承架损坏、轴承定位发生变化、零件磨损、油品污染严重,以及配流轴和导轨曲面的相位不对,引起配油不准,正反转转速不一致。检查与排除方法是:清洗或更换配流轴或缸体,若马达支承架损坏、轴承定位发生变化或零件磨损,应更换并重新调整轴承定位;若因配流轴和导轨曲面的相位不对,引起配油不准,应进行空载试运转,松开微调凸轮上的固定螺母,转动微调凸轮,调节配流轴与导轨曲面的相对位置,直至现象消失,然后锁紧螺母试机中校准配流轴相位角后,一般不得随意再动。
4.转子卡死
原因可能是:柱塞与柱塞孔、转子孔与配流轴的间隙增大,油液中的磨屑随高压油进入马达,将马达卡死;散热回路中背压进油节流小孔堵塞,造成散热不良,不能冲走马达内部污染物,使配流副和柱塞副等精密配合件局部温度升高,产生热冲击而卡死;高速柱塞马达的配流盘磨屑及系统中杂质进入柱塞孔,发生拉缸、咬缸、卡死;回程盘螺钉松动导致回程盘变形,使柱塞球面不灵活,造成柱塞与回程盘卡死。
检查与排除方法是:分解液压马达,清洗零件,更换损坏件;配流副和柱塞副配合间隙不正确时也要更换;必要时更换油液。

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