一、前言
我公司一螺杆泵突然跳闸。维修人员速赶现场对泵进行原因调查及维修。经拆泵检查，跳闸原因为铜轴套与轴径抱死所致。现结合轴套与轴径间隙对其抱死做一下技术说明。
二、原因分析
根据滑动轴承的工作情况,一般衬套孔与轴配合是间隙配合,零件图上轴径与衬套孔径的尺寸偏差,一般是按平均工作温度20℃时保证轴与衬套孔间具有合理间隙变化而确定的。影响滑动轴承过热故障的因素很多,在轴承结构设计合理,材料选用正确的情况下,滑动轴承过热主要是轴承径向间隙的大小装配不当及使用不当造成的。
滑动轴承径向间隙对轴承过热故障的影响,滑动轴承的径向间隙Δ就是轴承孔直径与轴颈直径之差,滑动轴承要留有一定的径向间隙,其作用如下:是实现轴与轴承活动联接的起码条件;是控制轴的运转精度的保证;是形成液体润滑的重要条件。因此,滑动轴承的径向间隙十分重要,过大或过小都极为有害。间隙过小,难以形成润滑油膜,摩擦热不易被带走,使轴承过热,严重时会“抱轴”;间隙过大,油膜也难以形成,会降低机器的运转精度,会产生剧烈振动和噪音,甚至导致烧瓦事故。
中译英：
The screw shaft locking analysis requires medium andspeed on the shaft sleeve gap, the improvement is put forward to solve the sleeve locking. Proved by practice,equipment operating parameters after the transformation of all normal.
One, foreword
Our company is a screw pump suddenly tripping. Repairpersonnel speed rush scene investigation and repair ofpump. Inspection by the demolition of the pump, the trip due to copper sleeve and the shaft locking caused by. The combination of the sleeve and the shaft diameter clearanceto do some technical explanations for its lock.
Two, analysis of the causes of
According to the working conditions of the general sliding bearing, bushings and shafts with the clearance fit, the part drawing shaft diameter and bushing aperture sizedeviation, usually by average temperature of 20 ℃ ensureshaft and bushing hole with reasonable gap variation and determine the. Many factors affect the sliding bearingoverheating fault, in the bearing structure design, material selection, under the right circumstances, sliding bearings overheated bearing radial clearance is mainly the size of the assembly due to improper and inappropriate use.
Influence of radial clearance of sliding bearing onoverheating fault of bearing, sliding bearing radialclearance is the bearing bore diameter and shaft diameter,bearing radial clearance to leave certain, the role is as follows: is the realization of shaft and bearing activities at least condition; is running accuracy control shaft isimportant; conditions for the formation of liquid lubrication.Therefore, the radial bearing gap is important, too large or too small are extremely harmful. The gap is too small, it is difficult to form a lubricating oil film, friction heat can not easily be taken away, so that the bearing overheating,severe "axle"; the gap is too large, the film is also difficult to form, will reduce the functioning of the machine precision,can produce severe vibration and noise, and even lead tothe tile burning accident.
