What Is an Idler Gear?

Idling refers to the running state of machines, instruments, etc. without any load, which will cause the moving wheels of a locomotive or car to slip on the track or on the road without moving forward. It may cause the traction motor to rotate at high speed and damage the motor.

Locomotive

1. When a locomotive attendant leaves or departs from duty, it is necessary to strengthen the inspection of the locomotive sand-spreading channel for smooth passage. If a problem is found, immediately report a live ticket and handle it in time.

2. For a locomotive equipped with a microcomputer display screen, when the locomotive is towing, the display data on the microcomputer screen should be switched to the interface showing the motor shunt to facilitate the driver to confirm whether the locomotive is turning in vacuum. For a locomotive without a microcomputer display, the learning driver (driver 2) should carefully confirm the display of the motor shunt meter when the locomotive is towing, and notify the driver in time if there is an idling phenomenon.

3. During the operation of the train, the driver should carefully control the train and prevent sanding to prevent idling when climbing the slope and before passing the curve (turnout). When the actual speed is close to the speed limit value of 5km / h, the driver should take precautionary sanding and adjust the position of the main handle in advance according to the line conditions to avoid idling against the line due to sudden changes in traction.

4. After the locomotive is idling, the driver should take immediate action to lower the main engine.

Since the idling of the locomotive moving wheels is the root cause of damaging the rails, how to prevent damaging the rails can be attributed to how to prevent the locomotive moving wheels from idling.

(1) Starting trains in the station

Start the train in the station, in order to avoid starting difficulties, it can be appropriately compressed

(1) Check the starter

Oil leak

There is oil seepage from the gearbox housing or oil pan, one reason is due to aging seals and poor sealing; the other reason is trachoma in the housing due to poor manufacturing processes.

2. The stalled engine stalls, no response, and impact

The test entry criteria are starting the engine, idling, pressing the brake, and entering the gear. The normal situation is that you feel in the gear within 1 to 1.2 seconds, release the brake pedal, and the vehicle will not step on the accelerator pedal. Start slowly and gradually extract a speed of 10-20 km / h. This is a normal entry standard. If the entry is delayed for more than 2 seconds after the entry, this situation requires immediate maintenance. The gear has a strong impact feeling, that is, the impact of positioning the gear. It needs to be explained that any automatic transmission has a certain degree of impact. If there is no feeling, it indicates that there is an internal failure, but the impact is relatively large. It is unacceptable. This problem is complicated and includes many aspects other than the gearbox. In the case of a stall fire, the engine will ignite when it is in gear. This problem is more obvious when the car is cold. Gearbox problems also have problems with other body systems.

3. If D or R is connected, the engine stall may be caused by the damage of the lock-up solenoid valve or the lock-up control valve.

When the D or R gear is engaged and the brake is released, the vehicle does not move. Or the car can travel a short distance after the cold car is started, but the car cannot drive in the hot car state. This situation is mostly caused by damage to the input shaft or reverse clutch, or damage to the D / R brake. It may also be that the automatic transmission has a serious oil leak and a serious lack of oil; the connecting rod or cable between the shift lever and the manual valve rocker is loose, and the manual valve is maintained in the neutral or parking position;

4. The oil inlet filter is blocked; the main oil circuit is leaking seriously; the oil pump is damaged

The impact of gear shifting and rushing of the vehicle during driving is also a common failure phenomenon of the automatic transmission. This may be caused by the transmission gear being too dirty and causing the valve body to become stuck. ^[2]

5. Gearbox slips and becomes weak due to acceleration; water enters gearbox

During the driving of the car, there is the sound of engine idling during the acceleration of the gas pedal. The speed of the car does not increase, and the entire car feels weak. This phenomenon is mostly caused by the burnt clutch plate. The gearbox enters water due to external reasons, which causes the gearbox to work abnormally. This may be due to oil in the water tank or water entering from the gearbox vent cap.

6. Abnormal sound

It is the abnormal noise of the bearing. Generally, the abnormal noise of the bearing is closely related to the speed. The higher the speed, the more screaming.

It is the abnormal sound of the differential gear or the main drive gear. This abnormal sound usually appears at a speed of 50-70 kilometers. Because of the different meshing surfaces of the gears, the sound is usually obvious when refueling, and the sound of releasing the throttle is significantly weakened.

It is abnormal sound of hydraulic system such as oil pump. This sound is closely related to the speed but has nothing to do with the vehicle speed. When the speed is high, the screaming is caused because the oil suction of the oil pump is blocked. It should be noted that the gearbox system works with the engine, chassis, and other parts. Many sounds are mixed, and it is not easy to identify. "

7. Odor generated in the cabinet

The gearbox body works with hydraulic oil. When the oil temperature is too high, some combustion will occur, and these odors will be transmitted, which means that some of the executive components in the gearbox body are not working properly.

8. Automatic shift time is too long or too short

Generally, automatic transmissions have specific shift speeds and vehicle speeds. If you find that the shift time is suddenly too long or too short, this means that the gear ratio of the gearbox is disproportionate, and the engine speed is too high. What's more, the gearbox is not shifting, which indicates that there is a problem with the gearbox.

9. High engine speed during driving

This problem includes two situations: high speed during steady running and high speed during acceleration: high speed during stable and easier to test. For example, a vehicle with an engine displacement of 2.0 can usually reach a speed of 100 kilometers at 2600 rpm. It often takes 3,000 rpm or more to reach 100 kilometers, which indicates this fault. Generally, this fault is caused by the failure of the high-speed gearbox or the failure of the internal lockup clutch of the shifter, and the gearbox needs to be repaired immediately. The speed is too high during the acceleration process. This failure test is a bit complicated, because during the acceleration process, the increase in the engine's speed is closely related to the accelerator pedal. For example, a normal Passat with a small accelerator has a normal body speed. The vehicle can be accelerated up to 2500 rpm, but the engine will be increased to 5500-6000 rpm at full throttle. Such a huge contrast is due to the fuzzy logic of the electronic control system of the gearbox, so this standard requires a certain degree of professionalism. Level to complete.

10. Engine idling

Engine idling generally occurs in two situations. One is that the engine idling suddenly occurs when the vehicle is stationary, and it returns to normal when the speed slows down. This situation generally indicates that the gearbox suddenly drops from the high position to the high position in a short period of time. In low gear, the problem may be in the control system or the cooling system, and there is no problem with the gearbox itself. The second is that there is a short slipping and idling phenomenon during acceleration or shifting. The intuitive feeling is that the latter is not as powerful as the former. In fact, it is actually the opposite. The latter is mostly in the gearbox. In the clutch and other related links, the gearbox needs to be completely dismantled and repaired, and the time cost is much more than the former. ^[2]