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6=SimSun loader transmission shifting mechanism damage reason and prevention Zhang Zhongyuan loader power shift transmission adopts hydraulic shifting multi-plate wet clutch shifting speed change mechanism, each gear is composed of 25 friction plates and corresponding pressure plate hydraulic cylinder When the shift lever is placed in a certain gear position, the pressure oil flows into the corresponding hydraulic cylinder through the control valve, and pushes the piston to press the active piece and the driven piece to achieve the transmission of power. In actual use, it is often waited until the machine is not working properly, so that the vaccine loses the optimal maintenance opportunity and shortens the service life of the transmission. This paper analyzes the causes of the damage of the power shift transmission clutch, introduces the method of detecting the clutch piston tightness and the transmission fault prevention measures to mention the service life of the power shift transmission.
Causes of Clutch Damage When the power shift transmission clutch is engaged, the pressure of the liquid oil also presses the friction plate against the elastic force. As the hydraulic oil pressure increases, the friction lining contacts the metal disk and is gradually compressed, causing the clutch to smoothly transfer the flywheel power to the transmission input shaft. Each time the gear is changed, the friction plate is rubbed against the steel sheet, and the generated heat is dissipated by the cooling liquid. When the friction plates and the steel sheets are thinned, more hydraulic oil is required in order to make them fully engaged, the engine must be accelerated, and the friction time of the friction plates is also extended in the steel sheets, and the frictional heat generated thereby is also more More, the temperature of the hydraulic oil is increased, and the transmission produces an internal leak when a temperature sufficient to change the performance of the seal in the transmission is reached. And 1 internal leakage, from two aspects continue to cause heat increase, high pressure oil leaks through the damaged seal, so that the oil temperature continues to rise; due to oil leakage, the hydraulic pump must deliver more oil to ensure the clutch is engaged The required pressure causes the clutch to be engaged, which also requires the engine to continue to accelerate, causing the hydraulic pump to generate more flow. Such a vicious cycle will eventually lead to overheating or burning of the clutch until it is completely ineffective.
When detecting the clutch piston sealability when the loader is running weak or the oil temperature is too high, it is necessary to judge whether the clutch piston is not tightly sealed or the oil pressure is insufficient. However, it is sometimes difficult to determine which cause causes the fault, especially in the case of conventional detection. In the absence of power, it is more difficult to inspect the seal rings of the assembled transmission assembly. At this point, a pneumatic valve can be used for testing.
First, remove the transmission control valve. The assembled transmission should be installed before the control valve, and then pass 0.6, 0.8 气体 of gas to each oil hole of the transmission. If a hole passes through the gas, the coupler is heard. The seal between the piston and the cylinder is good; if the sound of the piston pressing the friction plate is not heard and the leakage is large, the seal between the clutch piston and the cylinder is invalid, and the seal should be replaced.
The bearings and gear pairs of the power-shifting transmission are vulnerable parts, so the maintenance interval of the transmission should be regularly checked and repaired. The maintenance interval of the typical transmission in foreign countries is 500010000. According to China's national conditions, it is recommended to every 25005 0001! That is, the wear of the secondary clutch should be checked and the abnormal signal should be caught at any time. Since the power shift transmission cannot be quickly disabled, after the first wear marks of the friction plate, it is usually possible to continue to use the 750 10001. If it is frequently inspected and maintained during this period, and the friction plate seal and individual bearings are replaced in time, it can be avoided. Undamaged parts such as steel plate gear shaft hydraulic cylinders and most of the bearings are damaged.
The clutch often has the following abnormal conditions before it fails. Although the machine can still work, the oil in the transmission has already deteriorated, the viscosity has dropped and it contains metal impurities. Therefore, the oil sample of the transmission should be analyzed more frequently before the recommended oil change interval. . Because clutch wear is a sign of expansion of the transmission failure, if metal impurities enter the gear pair or jam the gear to make it impossible to center, if it stops without stopping, the shift performance in the transmission will be reduced. It is a sign of clutch damage when the clutch starts to slip, even if Smooth acceleration, the machine will also move forward, at this time should be shut down for maintenance.
The clutch operating oil level drops, and when the machine must accelerate to engage the clutch, the clutch has experienced excessive wear or seal failure. Therefore, measuring the oil pressure of the transmission and observing whether the oil temperature rises can determine the wear of the clutch.
At the same time, the oil quality should be analyzed. If iron or chromium particles appear in the oil, the gear pair has begun to wear.
In summary, if the seal and the friction plate are replaced before the clutch fails, the maintenance cost will be lower than the repair after the clutch fails.
Similarly, if the planetary row or gear pair is repaired before it fails, the cost is lower than when the transmission is completely damaged. 23 Author Address: 26652, Department of Transportation, Huangdao Campus, Qingdao Institute of Architecture and Engineering, Xuejiadao, Qingdao, Shandong, China