The overhaul of the tractor is inseparable from the overhaul of the clutch components. In order to improve the maintenance quality of the tractor, the overhaul methods and standards of the main components of the tractor clutch are introduced in detail.

The tractor clutch is composed of four parts: the active part, the driven part, the pressing mechanism and the operating mechanism. The main component of the active part is the driving disc; the main component of the driven part refers to the driven disc with friction linings riveted on both sides; the main components of the pressing mechanism are the pressing spring, pressing lever, and pressing rod bracket; The main components are separation lever, separation bearing, etc. The following tractor clutch manufacturers talk about the maintenance of the main components of the tractor clutch based on actual experience.

Overhaul of drive and driven discs

The main damage of the active disk is wear, scratches, burns and cracks on the friction surface; warpage and deformation of the friction surface. When the thickness of the active disc is 18±0.1 mm, the surface groove depth exceeds 0.50 mm, the arch deformation exceeds 0.30 mm, and the flatness tolerance exceeds 0.12 mm, it should be ground or flat. However, after polishing, its thickness is not less than 16±0.40 mm. If the active disk is cracked or too thin, it should be replaced with a new one.

The driven disc is the most vulnerable part of the clutch. The main damage is wear, hardening, burns, cracks on the surface of the friction plate, oil stains on the surface (dry type), loose friction plate, warping and deformation of the driven disc, fracture of the steel plate, loose riveting between the steel plate and the disc, spline holes wear, etc. It can be determined by measuring the depth of the rivet head with a vernier caliper. The burial depth of the rivet head shall not be less than 0.3 mm, otherwise, use a new friction plate. If the friction plate is seriously worn or there are more than two cracks and fall off, and the burnt surface is large and deep, the new plate should be riveted again. If there is a slight oil stain on the friction plate, it can be burned off with the flame of a blowtorch, or cleaned with gasoline, and the slight burnt surface can be polished with sandpaper.

When replacing the new piece to remove the old piece, use a drill bit 0.40-0.50 mm smaller than the diameter of the old rivet to drill out the rivet head, and then gently punch out the old rivet and remove the old piece. Use a wire brush to remove dust and rust from the driven disc, and check other parts of the driven disc. The warpage of the driven disc steel plate will cause the clutch to vibrate and wear unevenly when starting, so its warpage should be checked. The warpage of the driven disc steel sheet is also called circular runout or yaw. It can be installed on the inspection frame and measured at the outermost edge of the driven disc with a dial indicator. The circular runout limit is 0.80 mm. If it exceeds the limit, it can be calibrated by cold pressing with a special clamp;

Repair of elastic push rods

The main damage of the elastic push rod is the weakening of the elastic force, the reduction of the hole center distance, the wear of the support hole, and the breakage of the elastic push rod. After the elastic force of the elastic push rod is reduced, it is heated to 780 ~ 810 ° C, quenched in oil, and then heated to 450 ~ 475 ° C for tempering.

When the center-to-center distance of the elastic push rod becomes smaller, the original center-to-center distance can be restored by thermal deformation method. between the mouth. Increase the center distance of the holes, and then perform quenching and tempering according to the above method. When the center distance of the pin holes is enlarged, care should be taken to make the center lines of the two pin holes parallel. When the fitting clearance of the pin hole of the elastic push rod is greater than 0.50 mm, it can be repaired by the maintenance dimension method. The maintenance size can be increased by 1 mm, and the fitting clearance between the pin and the hole is 0.12 mm.

Repair of the compression lever

The pressing lever is also called pressing claw, pressing rod, cam, and releasing claw. It is commonly made of 45Cr or 40Cr; the arc hardness is HRC43-48, and the quenching depth is 1-3 mm. The main damage of the pressure rod is the wear of the pressure bearing arc surface and the pin hole. After the arc surface is worn, the distance from the bearing surface to the front hole will be shortened. The pin hole wear has a unilateral nature, the front hole is ground below, and the rear hole is ground above, which is determined by the force during compression. When the pressure rod wears less, the arc surface can be trimmed with whetstone to remove wear scars and unevenness; when the wear exceeds 1 mm, it should be repaired by surfacing welding.

Wear-resistant alloy electrodes can be used during surfacing to increase its wear resistance; after welding, use a grinding wheel to trim and form, and use a template to check the positional accuracy of the arc surface relative to the two holes, that is, use two pins to insert into the template hole and the pressure rod hole, See if the arc surfaces of the two coincide. After repair, the arc surface should be smooth and its busbar should be parallel to the center line of the two holes.

When the clearance between the pin hole of the pressure rod and the pin exceeds 0.4 mm, it should be repaired. The repair method is the same as that of the elastic push rod and carried out at the same time. It can also be repaired by inserts: the inserts are made of No. 45 steel, the wall thickness is 2-3 mm, and the interference is 0.04-0.08 mm. In addition, the pin hole can also be reprocessed after surfacing (annealing before welding), and the quality difference of each pressure rod on the same machine after repair should not exceed 15g.

Maintenance of release bearing and release sleeve

When checking the release bearing, fix the outer ring and rotate the inner ring. If there is blockage or obvious clearance, it is because the balls and raceways are worn and should be replaced; if the rotation is flexible, but there is a slight “rustling” sound, it is due to lack of lubrication, if necessary Melt it in grease, cool it and remove it for use. The release bearing should rotate flexibly without sharp noise or jamming, its axial clearance should not exceed 0.60 mm, and the wear of the inner race should not exceed 0.30 mm. The separation bearing is closed and cannot be disassembled for cleaning or lubricant. Before loading, the bearing should be soaked in molten lubricating oil (a mixture of calcium-based grease and gear oil in half), and it can be condensed before it can be used. fitted. If it is damaged, replace it with a new one.

The main damage of the release sleeve is: the pin hole supporting the elastic push rod is worn, the front end face is worn, the hole matching the clutch bearing is worn, the interference with the release bearing disappears, and the fit with the oil seal is worn, etc. When the inner hole is worn and the fitting clearance is greater than 0.50 mm, the inner hole or journal of the sliding sleeve should be repaired according to the maintenance dimension method. When the matching parts are repaired by the insert method, the hole can be enlarged by 7 mm. In order to facilitate processing, high temperature annealing should be performed before boring.

The maintenance of the hole supporting the elastic push rod after wear is the same as the pin hole on the elastic push rod, and it is often repaired simultaneously; the treatment of the worn front end face is the same as the end face of the pressure rod bracket, and it is also repaired by the surfacing method; and the separation bearing and oil seal After the mating part is worn, it can be repaired by brush plating. The normally engaged clutch release sleeve is also known as the release bearing seat. When the trunnion fitting clearance is greater than 1.50 mm, it can be repaired by surfacing welding and brush plating, or the old trunnion can be cut off and drilled at the old trunnion. Tapping, screwing a new trunnion, and welding it firmly at the root. After repair, the coaxiality error of the left and right trunnions and the vertical error of the left and right trunnions and the sliding hole should not exceed 0.30 mm. When there is wear scar on the working surface of the ear arm of the separating bearing seat, it can be repaired with oil stone, and it can be repaired by welding when the wear is serious.

Repair of release housing and release ring

The main damage of the very engaging clutch release bearing and bearing seat is the loose fit with the bearing, and the increased fit between the two pins of the release ring. When the clearance of the former is greater than 0.05 mm, brush plating should be used to repair the mating surface and restore the fit; when the clearance of the latter is greater than 0.50 mm, the hole should be trimmed and then the oversized pin should be replaced to restore the fit (the standard clearance is 0.50 mm). 07 to 0.31 mm). After the ball head of the release ring is worn out, it can be replaced with a new ball head. The clearance between the ball head and the release ring is 0.10 to 0.42 mm, and the clearance between the ball head and the fixed seat cover is 0.14 to 0.42 mm. After wear, the pins matched with the split inner lever can be repaired by brushing or inserting.

The above is all about the maintenance of the main components of the tractor clutch. As long as the main components are regularly repaired, the service life of the clutch can be improved.

The so-called clutch is to use “off” and “on” to transmit the right amount of power. The clutch consists of a friction plate, a spring plate (the tractor uses a disc spring, and the harvester uses a diaphragm spring), a pressure plate and a power take-off shaft. It is arranged between the engine and the gearbox to transmit the torque stored on the engine flywheel. To the gearbox to ensure that the agricultural machinery transmits the appropriate amount of driving force and torque to the driving wheel under different working conditions.

Clutch is a frequently rubbed part on agricultural machinery (friction plate is a wearing part), it will wear with the increase of use time and frequency, which will cause clutch slip phenomenon.

The clutch is the device that connects the agricultural engine and the transmission, and the clutch pedal is the operating device of the clutch. When the clutch pedal is stepped on or lifted, the engine and the transmission will be temporarily separated or smoothly combined to cut off or transmit power, and realize changes in the movement state of agricultural machinery such as starting, shifting, and parking. Slowly lift the clutch until it is fully lifted. If the engine stalls when the clutch is lifted, it means that the clutch is not slipping. If the engine does not stall when the clutch is lifted, it may be a problem with the clutch.

Features of clutch for agricultural machinery

Tractor clutch: The tractor clutch generally uses a double-acting clutch, that is, one way is responsible for walking, and the other way is responsible for power output. Due to structural reasons, the gap between the flange of the clutch pressure plate and the casing is relatively small, especially when the air humidity is high, and the tractor is not used every day (sometimes out of use for several months), so it is bound to be prone to rust. , The adhesion between the pressure plate bracket and the flange is caused by rust, which leads to the incomplete separation of the clutch.

Suggestion: Before using the tractor that has been parked for a long time, the tractor operator should first open the clutch observation port, use a flat-blade screwdriver to turn the clutch assembly, and spray a little rust remover on the three flanges of the clutch pressure plate, and then step on the A few clutch pedals to move it back and forth, and then use the tractor normally for various tasks.

How to operate the clutch

First, press the pedal firmly with the forefoot of your left foot, and step down or lift the clutch pedal with the flexion and extension of the knee and hip joints. Do not use the toes, soles or heels to step on the clutch pedal to prevent insufficient pedal strength or slip off. pedal. The action of stepping on the clutch pedal should be fast and all the way to the end, so that the clutch can be completely disengaged when the clutch pedal is lifted.

It should be determined according to the manipulation situation. Generally, when the working gear is changed to neutral, the clutch pedal can be lifted quickly. When the agricultural machine starts or shifts, the free stroke before the disengagement is not yet engaged can be slightly faster. When the clutch starts to engage When the clutch is fully engaged, the foot should be quickly removed from the pedal and placed under the pedal. When the clutch is not used in the work of agricultural machinery , Do not put your foot on the clutch pedal, so as not to cause the clutch to have a semi-linked phenomenon, affect the transmission torque, and increase the wear of the parts.

1. Start and shift of agricultural machinery

When starting, depress the clutch to completely disengage; when lifting the clutch pedal, operate according to the essentials of “one fast, two slow, three linkage”. That is, the process of pedal lifting is divided into three stages, starting to lift quickly; when the clutch appears semi-linked (the engine sound changes at this time), the pedal is lifted slightly slower; from the semi-linked to the fully combined process, the pedal is slowly lifted. Lift slowly. When the clutch pedal is raised, gradually step on the accelerator pedal according to the resistance of the engine, so that the agricultural machine can start smoothly. The operation of the throttle should be smooth and appropriate. The clutch pedal operation method of one fast, two slow and three fast should be followed to ensure smooth engagement.

2. Reduce the number of times the clutch is used

If the temperature is too high, the friction lining will be rapidly worn or cracked. Therefore, try to reduce the number of clutch disengagement and engagement, and the number of semi-linkages.

3. In emergency braking or approaching a stop

In the driving of agricultural machinery, do not depress the clutch pedal under any circumstances except for braking at low speed (above 10km/h), which requires depressing the clutch pedal. Depress the clutch and let the farm machine coast down to reduce shock to the engine and driveline.

In order to ensure safety: it is strictly forbidden to work uphill and out of gear, downhill to step on the clutch and slide in neutral gear, and to shift the gear and lift the clutch pedal to start the engine; Wait for the driving wheel to slip.

4. Do not step on the clutch

When the clutch on the agricultural machinery is working normally, it is in a tightly engaged state, and the clutch should not slip. The clutch disengagement is controlled by depressing the clutch pedal. When driving, do not step on the clutch pedal at all times except when the agricultural machinery starts, shifts and brakes at low speed need to step on the clutch pedal.

Stepping on the clutch without incident or putting your foot on the clutch pedal for a long time, the clutch is often engaged, disengaged or semi-slipped, which accelerates the wear of the clutch friction plate and pressure plate, so that the power of the engine cannot be fully transmitted. To drive the wheels, resulting in fuel costs, car costs, and increased driving costs.

Putting the foot on the clutch pedal for a long time during work can easily cause clutch slippage, ablation of the clutch disc, etc. In severe cases, the clutch pressure plate and the end face of the flywheel are ablated and pulled, and the clutch compression spring is annealed.

5. Correct operation when shifting gears

The gearbox of agricultural machinery is generally a meshing sleeve shifting structure. In order to make the shifting smooth and reduce the wear of the shifting mechanism and clutch of the transmission, the “two-leg clutch shifting method” is advocated. That is, when shifting up, depress the clutch pedal and shift the shift lever to a higher gear; when downshifting, depress the clutch pedal while shifting the shift lever to neutral, lift the clutch pedal and increase the speed appropriately according to the vehicle speed. One foot empty, then depress the clutch pedal again while shifting the gear lever into a low gear.

6. Correct use of clutch when braking

In the driving of agricultural machinery, do not depress the clutch pedal under any circumstances except for braking at low speed (above 10km/h), which requires depressing the clutch pedal. Because when the agricultural machinery is braking at medium and high speed, depressing the clutch pedal will not help to improve the braking ability of the agricultural machinery, and will also bring danger to the driving safety.

When braking and stopping at low speed, the purpose of depressing the clutch pedal is only to prevent the engine from stalling. At this time, the correct operation method is to depress the brake pedal first, and then depress the clutch pedal to make the agricultural machine stop smoothly.

The clutch is an essential and important part on the YTO tractor. It is used to transmit and cut off the power of the YTO engine to the gearbox and the power take-off, and to prevent the parts from being damaged when the drive train and the power take-off are overloaded. The clutch transmits torque by the friction force generated by the active friction plate and the driven friction plate. The magnitude of the friction force depends on the value of the pressing force of the friction plate and the properties of the surface material of the friction plate.

However, with the increase of the number of times of use or improper use, the tractor clutch transmission mechanism will wear out, and the YTO clutch friction plate will also become thinner due to wear, which will weaken the friction force of the main and driven parts of the clutch, and make the YTO clutch in the process of transmitting torque. Shaking, slipping, incomplete separation and other faults occur during the operation, which will affect the normal use of the vehicle. Therefore, the YTO clutch should be adjusted and maintained as needed after a period of use, which can effectively reduce the damage of the clutch, increase the use efficiency, and prolong the use. period and achieve better economic benefits.

1. Regular lubrication.

The working environment of the tractor is quite harsh. Every 10-20 hours of operation, grease should be added to the front bearing and release bearing of the clutch. The grease should not be added too much. Too much grease will easily overflow and pollute the friction lining, causing the clutch to slip. Usually 3-5 hits with a grease gun will do. For the closed structure release bearing, every 200~300h of work, use the oil immersion method to add lubricating oil. The specific method: remove the release bearing, use diesel oil to clean the bearing, and immerse it in melted high-temperature resistant butter after cleaning and rotating flexibly. The butter is filled with the bearing, take it out and install it after the butter has solidified.

2. Regularly clean the friction lining.

During the operation of the tractor, the clutch is easily contaminated by mud and water, resulting in rust spots and slippage. Therefore, for the clutch, it is necessary to do regular inspections and regular cleaning.

3. Regularly adjust the clutch clearance.

After the tractor works for a long time, the bolts will be loosened and the friction lining will be worn, which will cause the change of the gap between the various parts of the clutch and affect the normal use of the tractor. Therefore, it is necessary to check and adjust the clearance between the various parts of the clutch frequently.

4. Regularly check and adjust the free stroke of the clutch.

When the tractor works every 50-60h, the free stroke decreases due to the wear of the friction plate and increases due to the wear of other transmission parts. Therefore, it is necessary to check and adjust the free travel of the clutch pedal.

The above is all about the maintenance of YTO tractor clutch in a timely manner. Regular maintenance can improve its use value to a greater extent.

In the design of modern friction clutches, the structure of the tractor clutch assembly and the structure of related components should be reasonably selected according to the category of the tractor model, the use requirements, the matching requirements with the engine, the manufacturing conditions, and the standardization, generalization, and serialization requirements. It is described as follows:

The number of driven discs and the choice of dry and wet

(1)Single-plate dry friction clutch

The single-plate dry friction clutch has a simple structure, easy adjustment, compact axial size, complete separation, small rotational inertia of the follower, good heat dissipation, and smooth engagement even when an axially elastic follower disk is used. Therefore, it is widely used in micro, light and medium tractors and trucks at all levels, and is also popularized in large tractors and heavy trucks with engine torque not greater than 1000N.m. When the torque is higher, a double-plate clutch can be used.

(2) Double-plate dry friction clutch

Compared with the single-plate clutch, due to the increased friction surface, the ability to transmit torque is increased, and the engagement is also smoother and softer; in the case of transmitting the same torque, its radial size is smaller and the pedal force is smaller. However, the axial size is increased and the structure is complicated; the poor ventilation and heat dissipation of the intermediate pressure plate can easily cause overheating and accelerate the wear and tear of the friction plate, and even burn and break; the separation stroke is large, and the separation is not easy to be completely separated if it is improperly adjusted; the rotational inertia of the follower is large and easy to use Difficulty shifting gears etc. It is only used when the transmitted torque is large and the radial dimension is limited.

(3) Multi-disc wet clutch

There are more friction surfaces, and the joint is smoother and softer; the friction plate is immersed in oil to work, and the surface wear is small. However, the separation stroke is large and the separation is not easy to complete, especially when the viscosity of the oil increases in winter: the axial size is large; the rotational inertia of the driven part is large, so it has not been promoted in the past. In recent years, due to the continuous improvement of the technology of multi-plate wet clutches, heavy-duty vehicles are used again, and there is an increasing trend. Because it uses an oil pump to forcibly cool the friction surface, it will not overheat even if it slips for a long time when starting, and the starting performance is good. It is said that its service life can be 5~6 times longer than that of the dry type.

2. Structural type and arrangement of the compression spring

The structural types of the clutch compression spring are: cylindrical coil spring, conical coil spring with rectangular section and diaphragm spring, etc. Arrangements such as circumferential arrangement, central arrangement and oblique arrangement can be adopted. According to the type and arrangement of the compression spring, the clutch is divided into:

(1) Circumferential spring clutch

The compression spring of the peripheral spring clutch is a cylindrical coil spring and is evenly arranged on a circumference. Some heavy-duty vehicles arrange the compression springs on two concentric circles. The circumferential spring clutch has a simple structure and is convenient to manufacture, and has been widely used in various types of automobiles in the past. Due to the increase of the engine speed of the car (the maximum speed is as high as 5000~7000r/min or higher), under the action of the high-speed centrifugal force, the peripheral spring is easy to skew or even seriously bend and bulge out, which significantly reduces the pressing force. The spring ring leans against the positioning seat post, causing serious wear and tear of the contact part or even breakage. Therefore, modern cars and small, light and medium-sized passenger cars mostly use diaphragm spring clutches. But in medium and heavy trucks, the circumferential spring clutch is still widely used.

(2) Center spring clutch

A conical coil spring with a rectangular cross-section or 1~2 cylindrical coil springs are used as the compression spring and are arranged in the clutch contact, so the heat generated by the pressure plate due to friction will not be directly transmitted to the spring and cause its tempering failure. The pressing force of the pressure spring acts on the pressure plate through the lever system, and is enlarged according to the lever ratio, so the spring with a smaller force can obtain enough pressure plate pressing force to make the operation easier. When the central cylindrical coil spring is used, the axial size of the clutch is larger, while the conical spring with a rectangular section can significantly reduce the axial size, but its manufacture is relatively difficult, so the central spring clutch is mostly used in heavy-duty vehicles to reduce its operating force. .

(3) Inclined spring clutch

It is a new type of structure adopted by heavy-duty tractors. A large number of cylindrical coil springs are used as compression springs, which act on the force transmission sleeve at an inclination angle (the angle between the center line of the spring and the center line of the clutch), and the latter pushes the pressure rod and presses the lever ratio. Amplified and applied to the platen. At this time, the axial thrust acting on the inner end of the pressure rod is equal to the axial component of the spring pressure. When the friction plate is worn, the inner end of the pressure rod moves forward with the force transmission sleeve, so that the spring is elongated, the pressure is reduced, the inclination angle is also reduced, and the cos value is increased. In this way, the axial thrust of the compression spring can be kept almost unchanged within the wear range of the friction plate, so that the pressing force of the pressure plate can also be kept almost unchanged. Similarly, when the clutch is disengaged, the force transmission sleeve is moved backward, and the pressing force of the pressure plate is also roughly unchanged. Therefore, compared with the previous two clutches, the inclined spring clutch has the outstanding advantage of very stable working performance. Compared with the circumferential spring clutch, the pedal force can be reduced by about 35%.

(4) Diaphragm spring clutch

The diaphragm spring clutch has many advantages: First, due to the non-linear characteristics of the diaphragm spring, it can be designed so that when the friction plate is worn, the spring pressure can remain almost unchanged, and the pedal force when the clutch is disengaged can be reduced, making the operation light : Secondly, the installation position of the diaphragm spring is symmetrical to the center line of the clutch shaft, so its pressure is actually not affected by centrifugal force, the performance is stable, and the balance is also good: Furthermore, the diaphragm spring itself also acts as a compression spring And the function of the separation lever greatly simplifies the structure of the clutch, reduces the number of parts, reduces the mass and significantly shortens its axial size; in addition, because the diaphragm spring and the pressure plate are in contact with the entire circumference, the pressure distribution is uniform. , The contact of the friction plate is good, the wear is uniform, and it is easy to achieve good heat dissipation and ventilation.

Diaphragm spring clutches have been widely adopted and gradually extended to trucks. A series of diaphragm spring clutches with a transmission torque of 80^2000N.m and a maximum outer diameter of the friction plate of 420mm have been designed and produced abroad, and even some heavy-duty vehicles with a total mass of 2832t also use diaphragm spring clutches. However, the manufacturing cost of diaphragm springs is higher than that of cylindrical coil springs.

The operation of the diaphragm spring clutch used to be a press-type structure. At present, the press-type operation of the diaphragm spring clutch has been replaced by the pull-type operation structure. The latter diaphragm spring is installed in reverse, and the support ring is moved to the vicinity of the big end of the diaphragm spring, which simplifies the structure, reduces the number of parts, and facilitates disassembly and assembly: the stress distribution of the diaphragm spring is also improved, and the maximum stress decreases; the support The ring remains in contact with the diaphragm after wear so that the free travel of the clutch pedal is not affected. In the press-type structure, the wear of the support ring will form a gap and increase the free stroke of the pedal.

3. Structural type of driven disc

The simple driven disc is riveted from the driven disc, the friction disc and the driven disc hub. It has a simple structure and a small mass, and is sometimes used in heavy-duty vehicles, especially in double-disc clutches.

The use of driven discs with torsional dampers is a development trend, which is used in all cars. At this time, the driven piece and the spline hub are connected by a damping spring, which has tangential elasticity to eliminate high-frequency resonance and play a buffering role. Disk-shaped gaskets are installed for elastic clamping and play the role of friction damping, and keep the damping torque stable, so as to absorb part of the energy and attenuate low-frequency vibrations. The torsional shock absorber is specially designed according to the engine and the transmission system and has been corrected by tests, so that the best vibration and noise reduction effect can be obtained. A torsional damper with linear elastic characteristics, the damping spring consists of a set of cylindrical coil springs, commonly used in gasoline engine vehicles. The unevenness of the idle rotation of the diesel engine is large, which will cause the knock between the constantly meshing gears of the transmission. Adopting two or three-stage nonlinear torsional dampers and making the stiffness of the first-stage damping spring group small can alleviate the idling instability of the diesel engine and eliminate the idling noise of the transmission.

In order to make the clutch engagement smooth, the follower plate, especially the follower plate of the single-plate clutch, is generally axially elastic. The easiest way is to open a T-shaped groove on the follower plate, form many fan shapes on the outer edge, and punch them into waves that bend in different directions in turn. The friction plates on both sides are respectively riveted on each other sector-shaped plate. When the clutch is engaged, the driven plate is compressed, and the curved wave-shaped sector is gradually flattened, so that the pressure on the driven plate and the transmitted torque are gradually increased, so the engagement is smooth and soft. This kind of grooving is beneficial to reduce the warpage of the follower piece. The disadvantage is that it is difficult to ensure that the rigidity of each sector-shaped part is exactly the same.

In the split structure, the wave spring sheet and the driven sheet are punched and formed respectively and then riveted together. Since the wave spring sheet is punched by the same die, its stiffness is relatively consistent: since the wave spring uses a thinner steel plate than the driven sheet (the thickness is only 0.7mm), this structure is easy to obtain a smaller moment of inertia, These aspects are superior to monolithic structures. The above two structures, especially the latter one, are mostly used in cars.

A so-called combined follower is often used on trucks. In this structure, the wave spring sheet is riveted on the driven sheet on the side close to the pressure plate, the friction sheet is riveted on the wave spring sheet, and the friction sheet on the flywheel side is directly riveted on the driven sheet. Its moment of inertia is large, but this structure can also be used for large driven pieces that require high rigidity and good shape stability. When the diameter of the truck clutch is less than 380mm, the first two structures can still be used for the follower plate.

As agricultural machinery, tractors are the basic tools of current agricultural farming. At present, agricultural tractors basically transmit power through mechanical transmission, and clutch parts are essential. Once the tractor clutch is damaged, the operation efficiency of agricultural machinery will be greatly reduced.

Therefore, it is necessary to carry out regular maintenance on the agricultural tractor to avoid the failure of the tractor during use, which can help to improve the effect of mechanical operation and improve the efficiency of agricultural production.

Tractor Clutch Maintenance

Lubricate clutch bearings regularly

The clutch should be lubricated with lubricating oil frequently, and the front and rear bearings of the clutch should be greased every 12 hours, and the amount of each time should not be too much. For some closed-structure locomotives, the bearing can be removed during maintenance and then lubricated in heated butter. After the butter has cooled, the bearing can be taken out.

Adjust the distance between the standoffs to meet the standard

Due to the wear of the friction linings, the spacing of the clutch will change slightly, which will affect the working efficiency of the machine. Therefore, it is necessary to always check whether the clearance of the clutch is qualified. If it is not qualified, first loosen the lock nut on the clutch pressure plate, press the rocker arm of the clutch by hand, and then use a screwdriver to make fine adjustments. After finishing, tighten the nut and start the engine. Check whether the standard has not been met
If required, continue to adjust until the clutch clearance reaches the standard.

Clean friction linings to reduce friction

Cleaning friction linings is a very important job. Because the clutch is working for a period of time, oil will inevitably stick to the surface of the friction lining, and the friction lining will slip. At this time, the friction lining should be cleaned in time, and the cleaning work should also follow certain steps. First, put some clean gasoline in the cleaning port, turn on the engine, and let the escalator run for a few minutes in a closed state, then turn off the engine, and turn off the engine. Clean out the oil stains, then repeat one or two times, and finally disengage the clutch.

In general, agricultural machinery is the foundation and material guarantee of agricultural development. In the process of agricultural machinery development, the clutch problem is a stumbling block that hinders the development of agricultural machinery, which greatly affects the normal work of agricultural machinery. Therefore, it is found that agricultural machinery The common problems of clutches and their elimination one by one are not only of great significance to the development of agricultural machinery, but also have a certain impact on the development of agricultural economy and society.