The tractor transmission sound identification and diagnosis

The tractor drive train sound identification and diagnosis, 2018 - 11 - 23 Li Jinghua abnormal sound is a symbol of the tractor failure, it shows that the tractor one institution of technology state has changed. Some sound can forecast will be prone to accidental injuries, so when the tractor appeared sound, should be timely repair, preventing further failure. 1. Universal actuator sound universal driving device is composed of universal joint, drive shaft and the intermediate support. Universal transmission device in the work is not only to withstand high speed large torque and shock load, a long shaft is accompanied by vibration. The road, especially the deformation of the vehicle suspension will cause the shaft length and axial Angle between two shaft end constantly changing, the spline shaft slip in the transfer of power at the same time, also produce axial sliding. After long-term use, universal transmission device in various parts will inevitably occur wear, deformation and damage, causing the hair ring while working, pendulum and transmission efficiency to reduce failure ( All the hair ring with different degrees of pendulum, the results make transmission efficiency is reduced) , ultimately affect the normal work of the universal transmission device, exacerbated by the transmission and drive axle damage to internal parts. You should be careful inspection and repair in time. 1. 1 universal joint and the sound of the shaft spline loose kuang universal joint and transmission shaft spline after kuang, vehicles started body shaking, and the impact noise, the speed change ( Especially suddenly reduce the accelerator to reduce the speed) Noise, when more obvious. The main cause of failure is that the universal joint cross shaft and needle roller bearing wear loose kuang or needle broken broken; Drive shaft spline with keyway wear ranks, and the connection is loose, etc. Judgment method is the shaft by hand to turn right or left, if the parts wear overrun, due and apparent feeling of kuang. 1. 2 shaft imbalance heard the noise of the vehicle is a kind of periodic noise, the greater the higher the speed of sound, serious when, make the body trembling, bridge vibration, holding the steering wheel feel shock hemp. The cause of the above phenomenon is the shaft imbalance shake shake. 1. 2. 1 the rotation of the shaft axis is not collocated with transmission shaft axis. The shaft geometry axis deviation after its rotation axis, appear the phenomenon and the existence of the deflection of the same, also can make the shaft shake shake and ring. Drive shaft geometry axis deviation of rotating axis error reason is the center of the cross shaft. This error by two reasons: one is the cross shaft journal end face and center asymmetry, the other is a universal joint bearing and shaft neck wear, generate large amount of loose kuang, cross shaft, shaft geometry axis and rotation axis are not collocated. Judgment method: will frame, hang high-speed block, listen, watch, watch the shaft of the shimmy, especially after the speed suddenly fall, whether the oscillator is bigger. In addition, the road test, tractor, at high speed in the trunk to the periodic noise, when found the shaft out of balance should be repaired. 1. 2. 2 the shaft bending deformation. Drive shaft is a thin and long parts, in itself under the action of gravity, central shaft will produce a certain amount of bending, deflection. The deflection is the quality of the shaft center and the rotation axis offset, the offset in the shaft running produced by centrifugal force, and further cause the shaft bending, and generate additional deflection. Due to the direction of gravity is the same size, the size of the centrifugal force and the direction is changing, therefore, the drive shaft bending force is cyclical change, so that the deflection of the shaft changes, that is, the rotation of the shaft with bending vibration ( Forced vibration) , its frequency is equal to the drive shaft rotation speed. When the speed of the drive shaft bending close to its natural vibration frequency, which produce resonance phenomenon. Produce resonance, the vibration amplitude increase sharply, so that the shaft broken ( This makes the speed of the drive shaft broken called critical speed of the shaft) 。 The deflection of free bearing is longer than the other parts are inevitable. In the design, in order to guarantee working reliability and service life of the transmission shaft, the critical speed shall be the actual drive shaft using the maximum speed of 1. More than 2 times. Drive shaft assembly in use, however, due to wear or deformation ( Such as shaft tube bending, sag) Fixed bolt looseness or improperly installed, intermediate support, etc. , the drive shaft out of balance, which increased the radial runout, reduces the critical speed. If the situation is not serious, is a different degree of fluttering and hair ring, must pay attention to check. 2. Clutch sound discrimination and diagnosis of the clutch is installed between the engine and transmission, its function is used to joint or separation of power from the engine crankshaft. In the process of vehicle, a sound on the clutch pedal, relax the pedal sound disappear; Or on the, relax the clutch pedal has the sound, that can be judged as the sound of the clutch fault. 2. 1 if the clutch is a 'making cheep, cheep sound, is a good chance that clutch cover retaining bolt loose after touch the thrum of the flywheel cover, should immediately stop at this time, the engine flameout, open the clutch cover watch repair. 2. 2 clutch during separation and joint are sound, and drive the vehicle with trembling phenomenon, mostly platen condition, such as lining crack damage deficiency or rivets, platen and the spline set of rivet become loose and so on. 2. 3 no obvious sound when on the clutch pedal, raised his sound obvious, in most cases is the separation of bearing failure. （ The author units: 157500 MuLeng city in heilongjiang province agricultural machinery charge Source: 'friends of the farmers get rich' 1, 2018