After loading, the gear needs to transmit a large torque, so it is improved.
In this case, the products are generally produced by enterprises with weak equipment strength. The main problem is accuracy.
Question 2: What is the reason for the abnormal sound of the gear transmission of the reducer? It may be as follows:
1. Foreign body infiltration
2. Gear, shaft and bearing are damaged.
3. Improper lubrication
. . .
That's all I can think of for the time being
Question 3: What do the gears and bearings of the reducer show when they are broken? Please give a detailed answer. Generally speaking, there is noise, big gap and rising temperature.
The gear is broken, but the bearing is not necessarily broken. The bearing is broken, and 95% of the gears are broken.
Question 4: What is the reason for the abnormal sound of the main reducer? 1. The engine has abnormal noise.
Symptom description: There is a high possibility of abnormal noise in the engine compartment. Most people also judge the abnormal noise in the engine compartment according to the sound source, usually the harsh noise of metal or the noise of the wind whistling.
Solution: The abnormal sound of the engine indicates that the technical state of a certain mechanism of the engine has changed. The main reason is that some parts are worn or even improperly adjusted. Some abnormal sounds can indicate that the engine may be accidentally damaged, so when the engine has abnormal sounds, it should be repaired in time to prevent the fault from expanding.
Need to be reminded that if the engine is abnormal, most owners can't solve it by themselves, so it's best to send it to the factory for maintenance.
2. The gearbox has abnormal sound.
Symptoms: If there is a "rustling" sound inside the gearbox when the car is driving, but it disappears after stepping on the clutch or accelerator, there will be a whistle when shifting gears.
Solution: There are many transmission parts, and the causes of noise are complicated. When analyzing and judging, we should pay attention to whether it is related to a specific speed. For example, the noise of some planetary gears is obvious around 50 km/h, and whether it is related to some gears is very important for judging the fault of the transmission. If a gear rings, it must be related to the parts that affect the transmission of that gear. If all gears ring, it is often the fault of the normally meshed gear shaft or the lack of oil in the transmission. Whether it is related to specific actions, such as upshifting, downshifting, starting, sudden acceleration, sudden deceleration, turning, etc. It is an effective means to judge abnormal sound, and changing the speed and direction is particularly important to judge the rear axle fault.
If the abnormal sound of the transmission is obvious, it is recommended to send it to a professional repair shop to check the faulty parts and then replace them.
3. Abnormal sound due to wear.
Symptoms: When you step on the accelerator or brake while driving, there is always some abnormal noise in a certain part of the car body, which is not loud and does not affect the normal driving, but it always makes people a little worried about what the problem is.
Solution:
The abnormal sound of the door is mainly caused by insufficient lubrication, but it is necessary to judge whether it is the hinge position of the door or the glass lifter, door lock mechanism and handle mechanism inside the door. If it is a door hinge or stopper, the special grease for door hinge and slideway can be used, while the special grease for door accessories can be used for lubricating the glass lifter, door lock mechanism and handle mechanism in the door. Try to choose the brands commonly used in 4S stores, such as German Marti, Krupp, Tiger Bee, Flowserve, etc. Do not use engine oil or ordinary butter, it will freeze in winter, and the harmful smell will affect your health.
Question 5: What are the problems with the abnormal vibration of the reducer? 1. Foreign bodies have infiltrated. 2. Gear, shaft and bearing are damaged. 3. Improper lubrication. 4. Check whether the installation is firm.
Question 6: What caused the abnormal sound of the main reducer? The driving and driven gears of the main reducer of the rear axle can be divided into grinding teeth and fine grinding teeth according to the different processing technology. The grinding accuracy is low, and there are obvious knife marks on the surface of gear teeth, which need to be run-in by motor vehicles in the future, while the fine grinding teeth have been finely ground, so there is no need to run-in again.
The differential ring is actually the ring of the main reducer. The main reason is the meshing clearance and imprint of the driving and driven gears, especially for trucks. It is necessary to determine the appropriate meshing marks.
And the state of the vehicle when the differential rings. If it is in the deceleration state, or a certain speed state is making noise, it is mainly caused by improper meshing clearance. If both the acceleration state and the deceleration state ring, it is often caused by low machining accuracy or improper meshing of gear teeth.
Question 7: Causes and solutions of vibration and abnormal noise of the reducer during driving. Stop and check to see what the problem is.
Is there a problem with the connection? The screw is loose. Or there is something wrong inside the reducer.
Timely maintenance, so as not to cause greater losses.
Question 8: Abnormal sound of gearbox 1. Open the manhole cover to see if there is any problem with the gear and if there is any sundries in the gearbox; 2. Measure the oil sample and analyze the composition; 2. Do the vibration frequency test, and you can probably judge which position is the problem according to the frequency relationship.
Question 9: Abnormal noise during deceleration. Is there the same situation? First, the relationship between abnormal sound and engine speed.
The existence of the most common abnormal noise of the engine depends on the speed state of the engine.
1, abnormal noise only exists when idling or running at low speed. The causes of noise are: the gap between piston and cylinder wall is too large; The piston pin is assembled too tightly or the connecting rod bearing is assembled too tightly; The gap between tappet and its guide hole is too large; Wear of valve cam profile; Sometimes the starting grip is loose, which will make the pulley ring (obviously when shifting).
2. Keep a certain speed of sound disorder, and make short sounds one after another when slowing down sharply. The causes of noise are: the camshaft timing gear is broken or its fixing nut is loose; The crankshaft is broken; Loose piston pin bushing; Excessive axial clearance of camshaft or loose bushing.
3. Abnormal noise occurs when the engine accelerates rapidly, and it still exists when the engine runs at high speed. The causes of noise are: the connecting rod bearing is loose, the bearing bush melts or rotates because of the inconsistent size; Crankshaft bearing looseness or bearing bush burning; Piston pin is broken; The crankshaft is broken.
Second, the relationship between abnormal sound and load
Many abnormal noises on the engine are obviously related to its load. In the process of diagnosis, the load can be reduced one by one. Single-cylinder or double-cylinder fire extinguishing methods are usually used to reduce the load of one or two cylinders to determine the relationship between abnormal noise and load.
1, a cylinder caught fire, and abnormal sound did not exist or decreased. The reasons for the ringing are: the piston knocks on the cylinder; Connecting rod bearing is loose; Piston ring leakage; The piston pin is broken.
2, a cylinder is on fire, the sound is aggravated, or there is no sound, but there is sound at this time. The reasons for the noise are as follows: the copper sleeve of the piston pin is loose; The taper of piston skirt is too large; The piston pin is disengaged; The fixing bolt of connecting rod bearing cover is loose, and even the alloy of connecting rod bearing bush melts and falls off; The flywheel fixing bolt is too loose.
3. Abnormal sound caused by fire of two adjacent cylinders is reduced or disappeared. The reason for the noise is that the crankshaft bearing is loose.
Third, the relationship between abnormal sound and temperature
1. It makes sound at low temperature, and the sound decreases or even disappears when the temperature rises. The causes of noise are: the gap between piston and cylinder wall is too large; Due to the depth and width of the main bearing oil groove, the piston is misaligned; Low oil pressure and poor lubrication.
2. There is noise after the temperature rises, and the noise decreases or disappears after the temperature decreases. The reasons for the noise are: overheating causes premature combustion; The long and short axes of the piston skirt ellipse are opposite; The ellipticity of the piston is small, and the gap between the piston and the cylinder wall is too small; Piston deformation; The clearance of piston ring is too small.
Fourth, the relationship between abnormal sound and engine working cycle
The abnormal noise of the engine is often obviously related to the working cycle of the engine, especially the abnormal noise of the crank-connecting rod mechanism and the valve train is related to the working cycle. As far as the four-stroke engine is concerned, all sounds caused by crank-connecting rod mechanism will be emitted twice when the engine is working; All noise generated by the valve train is generated by the engine working once.
1. The abnormal sound of crank-connecting rod mechanism is caused by the following reasons: the piston hits the cylinder wall; Knocking sound of piston pin; Cylinder head at the top of piston; Connecting rod bearing is too loose; The piston ring leaks air.
2. Abnormal sound of valve train is caused by the following reasons: excessive valve clearance; The gap between tappet and its guide hole is too large; The cam profile is not damaged; The gap between the valve stem and its conduit is too large; The valve spring is broken; Radial fracture of camshaft timing gear; Loose valve seat ring; The valve is stuck and cannot be closed.
3. If the abnormal sound has nothing to do with the duty cycle, pay attention to its ringing area. The noise caused by the clearance that is usually irrelevant to the working cycle is mostly the failure of engine accessories; If there are parts that have nothing to do with the working cycle that emit continuous metal friction sound, it can be considered that some rotating parts are faulty.
V. Relationship between Abnormal Sound and Engine Parts
When the engine has abnormal sound, it will inevitably produce some vibration. According to the characteristics and location of vibration, the cause of abnormal sound can be diagnosed.
Question 10: What is the reason for the abnormal sound of the reducer after no load? Check whether the current is normal and whether the temperature will rise. If not, it may be a bearing problem. Just replace the bearing.