What are the hazards of gear wear? What are the consequences of gear pump wear?

After wear, the powder accelerates wear, the gear clearance increases, the noise becomes larger, the efficiency decreases, and the gear strength decreases, and safety accidents are prone to occur.

After wear, small iron slag is formed, which causes accelerated wear on the entire system.

1.Forms and causes of tooth flank wear failure.

1) Divide from a microscopic perspective.

From a microscopic point of view, the wear of gears can be divided into four basic types according to different wear mechanisms: abrasive wear, adhesive wear, fatigue wear and corrosion wear. Abrasive wear is mainly caused by pear groove and microscopic cutting; Adhesion wear is closely related to surface molecular force and frictional heat. Fatigue wear is the result of the initiation and propagation of surface fatigue cracks under cyclic stress. Corrosive wear, on the other hand, is caused by the chemical action of the environmental medium.

In the actual phenomenon of wear, it is usually the coexistence of several forms of wear, and the occurrence of one type of wear often induces other forms of wear. For example, the abrasive debris of gear fatigue wear moves between the two tooth surfaces of meshing, similar to grinding, which will cause abrasive wear in contact with the tooth surface, and the clean surface formed by abrasive wear may increase the adhesion of molecules, thereby causing adhesion wear, and at the same time, the molecules of the gear tooth material can lead to corrosion wear due to oxidation or chemical changes with the surrounding medium. The fretting wear of gears is a typical compound wear.

In the fretting wear process, various forms of wear may occur, such as adhesive wear, corrosion wear, abrasive wear and fatigue wear. With the change of working conditions, the priority of different forms of wear is different.

2) Divide from a macro perspective.

From a macro point of view, according to different wear damage phenomena, the wear of gears mainly includes: tooth surface wear, abrasion, pitting, cracks, spalling and gluing. The tooth surface wear is mainly caused by the relative sliding of the two tooth surfaces in contact. Abrasion is the phenomenon of grooves and abrasive particles along the friction direction on the friction tooth surface due to the action of the pear groove; Pitting corrosion is a phenomenon in which tooth surface pits are formed due to metal fatigue failure under the repeated action of contact stress. Spalling is a phenomenon in which the tooth surface becomes brittle due to deformation and strengthening, and microscopic cracks occur under the action of load. Cracks are mainly due to the repeated action of alternating stress or excessive local stress caused by the phenomenon of local cracking.

Gluing is a phenomenon of severe wear and tear that occurs at a certain depth in the layer when the adhesion effect makes the surface bond point have a high connection strength, resulting in the bite of the two tooth surfaces. Due to the joint action of a variety of influencing factors in gear work engineering, there may also be several kinds of wear damage at the same time.

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1.Reduced efficiency of the pump: Wear of the circular gear pump before starvation will cause the gear clearance to increase, which will reduce the efficiency of the pump and prevent it from working properly.

2.Increased pump noise: Gear pump wear will lead to increased gear clearance, which will increase the noise of the pump and affect the working environment.

3.Increased leakage of the pump: Gear pump wear can lead to the aging of the seals, which can increase the leakage of the pump and affect the work efficiency.

4.Shortened pump life: Gear pump wear can lead to increased wear and tear on components such as gears and bearings, which can shorten the life of the pump.

5.Increased failure rate of the pump: Gear pump wear will lead to an increase in the failure rate of the pump, which will affect the efficiency and production efficiency.

Therefore, in order to avoid the adverse consequences of the wear and tear of the collapsed gear pump, it is necessary to regularly inspect and maintain the gear pump, replace the parts with serious wear in time, and maintain the normal working condition of the pump.

Because the gear pump is divided into oil pressure area and oil suction area, the pressure of the oil pressure area is greater than the pressure of the oil suction area, and the radial force generated by the pressure is not the same, resulting in the unbalanced radial force of the hydraulic pump. The radial force is unbalanced, so that the transmission shaft will deviate to the oil suction area, resulting in the gear and the pump or the leakage wall scraping, affecting the normal operation of the pump, resulting in leakage, wear and tear resulting in the reduction of pump life.

1. The gears of manual transmissions often work under the condition of high speed, high load, and continuous alternating speed and load, and normal wear and tear are inevitable.

2. In addition to normal wear and tear, the gear will also be affected by the quality of lubricating oil, poor lubrication conditions, improper driving operation, improper meshing position of the gear assembly during maintenance, poor gear tooth meshing and starting jitter, etc., which will accelerate the wear and damage of the gear.

3. The wear of other parts of the gear or other parts (such as the spline groove, bearing, spline shaft bending in the gear hole, etc.), the improper assembly of the clutch or transmission shaft, and some defects in manufacturing (such as uneven carburizing layer, gear warping, etc.) will also accelerate the wear of the gear.

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Note: 1. Only when the gear lever is placed in the P, N position, the engine can be started, in the ignition switch is turned on, if you want to move out of these two gears, you must first step on the brake pedal, and press the handle button at the same time, before you can move the gear lever into other bright gears.

2. P gear can be used as an auxiliary brake for hand brake, but it cannot replace the hand brake.

3, when the vehicle is towed, the gear lever must be placed in the n position, the speed of the towing shall not exceed 50km h, the traction distance shall not exceed 50km, if the towing longer distance is required, the driving wheels need to be lifted off the ground.

4. If the control unit of the automatic transmission enters an emergency state due to electrical failure, at this time only the R gear can work, do not think that there is still a gear available, do not repair Jian Yukuan, the fault should be identified and eliminated in time, otherwise the multi-plate clutch in the automatic transmission will be damaged.

5. The automatic transmission car cannot start the engine by traction or pushing, because the ATF oil pump does not work, and the automatic transmission cannot establish a normal working oil pressure.

Encyclopedia - Transmission gears.

Encyclopedia - Wear.

Summary. The material and processing technology of the gear are not the same, resulting in different hardness. Within a certain range, the harder it is, the more wear-resistant. Therefore, wear resistance is still related to hardness.

The material of the gear is different from the processing workmanship, resulting in different hardness. Within a certain range, the harder the smile of the clan, the more wear-resistant. Therefore, the wear resistance is still related to the hardness.

In the customer's cognition, when they see the gear, will they think of wear-resistant?

In order to improve the hardness of the quenched parts, it is necessary to use the method of low-temperature tempering, the higher the temperature of the tempering, the hardness of the quenched parts will be more auspicious. The hardness is high, and the wear resistance will naturally increase.

Tires are one of the most important components of a car. Whether it is good engine performance or good transmission performance, power effect and driving safety ultimately need tires to perform. Therefore, we should do our best to protect the tires of our cars in our daily driving.

When it comes to tires, we have to mention the wear and tear of tires. So how can we reduce the wear and tear of tires when we use cars in our daily lives?

1.The stage of tire wear is the initial stage, because it is a transition from static friction to dynamic friction. At this time, the friction on the tires is the greatest, and the wear is naturally the greatest.

Friends who often use the car don't know how many times a day to start, so the car must be stable when starting, and the speed should not be too fast, so as not to drag between the tire and the ground and cause increased wear, and the start must be as stable as possible.

2.In abnormal situations, sudden braking should be the behavior that causes the most tire loss. I'm sure you've all seen long brake marks on the road, leaving such conspicuous marks on the ground.

You can imagine how damaging the tires can be caused by sudden braking, and for this reason, the car needs to change the tires several times during a race. It is advisable not to pursue speed too much when driving, safety is the most important thing.

3.When going uphill and downhill, the car is affected by gravity and the friction that needs to be provided also changes. Especially uphill, when gravity translates into drag, and the tires need to provide more friction to keep the car moving.

Therefore, when going uphill, try to keep up with the climbing, so as to ensure that the friction and travel coefficient of the contact surface is minimized; When going downhill, gravity turns into power. At this time, you need to control your speed to avoid sudden braking, so keep driving at a low speed.

4.Finally, the tread thickness of the car is relatively high, but the tire wall is thinner. When the car turns, most of the gravity moves towards the front side of the car due to inertia.

If the speed is fast, the inertia will increase, the pressure on the tire will be greater, and the tire wall will be easily damaged at this time. Therefore, the speed and steering angle of the car need to be controlled when turning.

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Gear tooth surface wear, mostly seen in open transmission, poor lubrication conditions, and more dust in the working environment.

Tooth surface wear is generally caused by the abrasion and wear caused by soft tooth surface, dust, and metal particles that are rubbed off by tooth surface.

Although the torque converter can transmit and increase the engine torque, the torque conversion ratio is not large, and the transmission range is not wide, which is far from meeting the needs of the automobile working conditions. In order to further increase the torque, expand its transmission range, and improve the adaptability of the car, an auxiliary transmission is installed behind the torque converter, and the planetary gear mechanism is mostly used.

The planetary gear transmission is composed of a planetary gear mechanism and actuators such as clutches, brakes and one-way clutches. A planetary gear mechanism usually consists of multiple planetary rows. The number of planets is related to the number of gears.

The shift actuators of planetary transmissions include shift clutches, shift brakes, and one-way discs.

Extended Materials. The manual gearbox is mainly composed of gears and shafts, and the variable speed and torque are generated through different gear combinations; The automatic transmission AT is composed of a hydraulic torque converter, planetary gears and a hydraulic control system, which achieves variable torque through hydraulic transmission and gear combination.

Among them, the hydraulic torque converter is the most characteristic component of the AT, which is composed of pump wheels, turbines and guide wheels, etc., which directly input the engine power to transmit torque and separation.

The pump wheel and the turbine wheel are a pair of working combinations, they are like two fans placed opposite each other, the wind from one active fan will drive the blades of the other passive fan to rotate, and the flowing air - wind becomes the medium of kinetic energy transfer.

If the liquid is used instead of air as the medium to transfer kinetic energy, the pump wheel will drive the turbine to rotate through the liquid, and then add a guide wheel between the pump wheel and the turbine to improve the transfer efficiency of the liquid. Due to the torque converter automatic variable speed torque range is not large enough and the efficiency is low.