Centrifugal clutch on a single axle tractor with their own hands. The course of action consists of these steps:
Homemade centrifugal clutch from chainsaw clutch.
Detailed information about this clutch, as well as other centrifugal clutches in our online store Nado-Brat.
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Varieties of motobloc clutch mechanisms
Modern motor blocks are distinguished by design features. There are different kinds of clutches that can be fitted to machinery:
- friction clutch. This type is most in demand among farmers. These mechanisms are easy to maintain, can work for a long time without interruption and have a high efficiency;
- centrifugal clutch. Prolonged towing and rapid wear and tear of parts have caused the centrifugal clutch to be under-recognized;
- Belt clutch of the motoblock. Such a mechanism is not very reliable, has a low performance, quickly worn out when working with powerful engines;
- hydraulic coupling. By pressing the pedal, the main piston starts to move. During its rotation, the lubricating liquid is set in motion. Pressure from the piston is transmitted to the connecting rod and the springs automatically return the piston to its starting position
- disc clutch on power tillers. All elements of the mechanism are very reliable and allow smooth start of the machine. There are single-disc and multi-disc equipment with almost the same principle of operation.
There are dry, air clutch types and those that work in a bath filled with engine oil.
What kind of clutch can be made for a homemade mini-tractor?
This question is relevant not only for beginners designers, but also for those who are engaged in similar work not for the first time.
Among the variety of permissible options, it is better to settle on the most simple and standard options:
Designation and varieties
The clutch carries out inertial transmission of torque from the crankshaft to the transmission gearbox, ensures smooth motion and gear shifting, regulates the contact between the transmission gearbox and the motor of the power train. If we consider the features of the design, clutch mechanisms can be subdivided into:
A distinction is made between wet (in a bath of oil) and dry mechanisms according to their operating environment. Clutch engagement mode is divided into permanently closed and not permanently closed device. A distinction is made between single-flow and dual-flow systems according to whether the torque is transmitted in one or two streams. The design of any clutch mechanism includes such elements:
Friction clutch is the most popular among farmers-owners of motor-block machinery, because it features ease of maintenance, high efficiency and duration of continuous operation. The principle of operation is the use of frictional forces that occur between the facets of the driven and driven parts that are in contact with each other. The leading components work in close connection with the engine crankshaft, and the driven ones. with the gearbox main shaft or (if it is absent) with the next transmission unit. The friction system elements are usually in the form of flat discs, but some power tillers have other forms. block or cone.
In a hydraulic system, the torque is transmitted through a fluid, which is pressurized by a piston. The piston is returned to its original position by the springs. The electromagnetic clutch is based on a different principle. the system elements move under the action of electromagnetic forces.
This type is regarded as permanently open. The centrifugal type of clutch is used in boxes with automatic shifting speeds. Not very common due to the rapid wear of parts and the long duration of slippage. The disc type, irrespective of the number of discs, is based on one principle. Reliable and smoothly starts/stops the machine.
The belt clutch is characterized by low reliability, low efficiency and fast wear, especially when operated with high-power motors.
How the clutch works
The clutch for the power tiller consists of several important elements:
The drive consists of the flywheel side of the engine and the pressure plate. The disc rotates with the attached flywheel. The disc can also move axially with respect to the flywheel. Between these two elements there is a slave disc, in which is located on the drive shaft. Cylinder shaped spring elements are arranged around the circumference of the pressure plate. The function of the springs is based on compression of the disc that they underlie. The other end of the springs make contact with the casing. The springs thereby keep the clutch for the power tiller in a constant engaged state.
The drive mechanism is made up of push-rod levers connected to the pressure plate housing via tie rods and a foot pedal. By disengaging the clutch, the owner of the power tiller engages the clutch cable, which transmits the force to the squeeze levers. When the springs are compressed, the levers draw the drive plate away from the pressure plate, resulting in disengaging the clutch.
The bearing reduces friction by preventing the fixed link from touching the rotary levers. Most tractor models have three levers that are at a 120 degree angle to one another. Each clutch lever is returned to its original position by a spring. By doing so, the lead moves the lever to the desired distance to disengage the levers. If this distance is not reached, the clutch begins to slip.
Starter for power tiller. manual or electric?
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Designation and varieties
The clutch provides the inertial transmission of torque from the crankshaft to the transmission gear, ensures smooth starting and shifting of gears, regulates the contact between the transmission gearbox and the motor of the tractor unit. Looking at the design features, clutch mechanisms can be subdivided into:
A distinction is made between wet (in a bath of oil) and dry mechanisms according to their operating environment. According to the engagement mode, a distinction is made between continuously closed and noncontinuously closed. A distinction is made between single-flow and dual-flow systems in terms of whether the torque is transmitted in one or two streams. The design of any clutch mechanism includes such elements:
Friction clutch is the most popular among farmers-owners of motor-block technique, because it features ease of maintenance, high efficiency and duration of continuous operation. The principle of operation is the use of frictional forces that occur between the facets of the driven and driven parts that are in contact with each other. Master components work in lockstep with the engine crankshaft and slave components with the gearshift transmission main shaft or (if there is no gearshift transmission) with the next transmission unit. The friction system elements are usually flat discs, but some power tillers feature a different shape. chock or cone.
The centrifugal clutch has such indisputable advantages as reliability and long service life. This design is used in automatic transmissions. This device consists of a standard set of components:
- the hub, which is equipped with a stop groove and a key;
- stop ring.
Due to the connection between the differential and the centrifugal clutch, the unit is easier to control, improves its maneuverability and smooth turns. In addition, the differential provides speed control of the wheels and is involved in their locking. Certain models of power tillers have special locking mechanisms that make it possible to stop one wheel independently from the other.
Modern units can be equipped with mechanisms of various designs. There are several types of these mechanisms:
- Friction. easy to maintain and able to work for a long time without pauses with high efficiency;
- centrifugal. has the disadvantage of rapid wear of parts of industrial mechanisms;
- belt drive. is not very reliable and efficient, it quickly fails on powerful power units;
- hydraulic. by pressing the pedal sets in motion the piston, the rotation of which gives motion to the lubricating liquid; from the piston the force is transmitted to the connecting rod, and the springs return it to its original position;
- disc. distinguished by high reliability of parts and smooth starting; there are single-disc and multi-disc mechanisms, working on the same principle.
The clutch device
With all the variety of brands of motoblocks, their classes and modifications, the clutch device always includes several necessary parts:
The control unit includes direct control squeeze levers connected to the pressure plate by means of rods and a diverter equipped with a pedal. At the moment the operator turns off the device, the pedal transmits the force to the levers by means of an outlet equipped with a bearing. When the springs are compressed, the levers connected to the pressure plate move away from the clutch, causing the clutch to release.
The presence of a bearing in the design is intended to minimize the friction factor because the diverter and levers are not in contact. The standard design has three levers that are set relative to each other at an angle of 120 degrees. The presence of the springs ensures that the parts return to their original position. The offset is shifted by the distance required to release the mechanism, and this distance is very important: if the correct distance cannot be achieved, this causes the clutch to slip and the friction lining to be subjected to increased stress and premature wear. If, on the contrary, the distance is exceeded, the clutch is not completely disengaged.
In this video you will learn how to change the clutch: https://youtu.be/FzruVDIm_7o
The drive component consists of the end of the engine flywheel and a pressure plate that rotates with it at the same time. In doing so, the disk also moves on its axis in relation to it. There is a second disc between these two components, the hub of which is located on the splined shaft. This is the driven part of the device. Around the drive disc, there are cylindrical springs that are preloaded and are needed to press the pressure plate down. This is achieved by placing one end of these springs against the disc and the other end against the casing on the driven surface. This is what makes it possible for the device to be always on, even when it is not moving with the motor running.
Activating the stopping device generates a signal to the release levers and simultaneously disengages the driven part, which results in disengaging the clutch.
The clutch of small agricultural machinery is generally fitted with a bearing to reduce friction. Its presence provides a smooth movement of the levers with the exclusion of their contact with each other. There is also a spring in the device that ensures the return of the control element to its original position after shifting.
Making a clutch for a power tiller with your own hands
In continuous operation, the clutch parts are in constant motion and wear out, so even the most reliable elements will wear out over time. Over time, you will need to buy new parts or build your own.
Before you make a clutch on a single axle tractor, it is worth getting hold of these parts:
- flywheel and primary shaft (an old gearbox from a Soviet Moskvich will do);
- The drive pulley with two handles;
- A steering knuckle and a working hub (you can take it from the Tavria);
- Crankshaft (GAZ-69);
It is worth first considering drawings clutch structure. This will greatly simplify the work.
Homemade clutch is made according to the following scheme:
- The crankshaft is machined until it touches the internal parts of the machine;
- The original hub is put on the shaft;
- The place for the bearing is ground on the shaft. The hub is installed without gaps, so that the pulley wrapped around freely;
- Turn the crankshaft over and do the same on the other side;
- Make six holes at regular intervals in the pulley with a drill and a five millimeter drill bit. The ten-millimeter bolts will be screwed into them;
- Install the pulley over the flywheel and fasten the elements with bolts. The holes are marked, taking into account their coincidence with the pre-drilled holes;
- Pull out the pulley and drill appropriate holes in the flywheel;
- The inner surface of the flywheel and shaft is ground until the parts are no longer in contact;
- It is necessary to have a clutch handle for a single-axle tractor. Take a tube with a length of 30 millimeters and a diameter of 10 millimeters, it is mounted on the pulley;
- The clutch cable for the power tiller can be taken from an old chainsaw. It is wound on a coil.
Independently prepared clutch can be installed on the following brands of power tillers: Agro, Neva MB-2, Kaskad.
Types and description of motor-block clutch mechanisms
Depending on the design features of power tillers, agricultural units can be equipped with these types of clutches:
- Friction clutch. mechanisms of this type are the most popular among farmers. Among their advantages are simplicity in repair and maintenance, long working life and high efficiency;
- Centrifugal clutch. the disadvantages of this type of nodes include propensity to long slippage and rapid wear of the rubbing surfaces, due to which the centrifugal clutch has not found the planned application indicators;
- Hydraulic clutch. in this type of device, when the pedal is depressed, the main piston begins to move. In the process of its rotation, it presses special hydraulic fluid through the main channel. The piston actuates the piston rod, after which, under the influence of the springs, the piston automatically returns to its original position;
- Belt traction on a motor-block. the low popularity of mechanisms of this type is caused by such drawbacks as low reliability, modest performance and quick wearing when operated with powerful motors.
- Disk clutch. you can find engine blocks equipped with a single-plate or multi-disc clutch on the market; the principle of operation of both mechanisms does not practically differ. The disk clutch on power tillers has gained popularity due to the high reliability of the mechanism elements and smoothness of starting the power tiller.
By their type of friction, clutch mechanisms are divided into dry clutches and those that operate in an air environment or in a bath of engine oil. Depending on the initial start-up mode, you will find a non-permanent and a permanently locked clutch on sale.
Clutch for power tiller with his own hands
Regular work of the clutch system involves constant friction of its parts, due to which even the most reliable mechanism sooner or later breaks down. After that, you can buy a new device, or try to make a homemade clutch for an agricultural machine.
Before you make a clutch on a single-axle tractor, you will need to prepare certain parts. For the work we will need:
- Flywheel and the primary shaft, taken from the gearbox from a Soviet Moskvich;
- Rotary knuckle and serviceable hub from the car Tavria;
- Slave pulley, complete with two handles;
- Crankshaft from the car GAZ-69;
In addition to preparing spare parts, we advise you to study the drawings of the clutch system in advance. These indicate the location of the parts and the order in which they are assembled. The clutch mechanism is manufactured in the following order:
- First, grind the crankshaft used so that it does not touch the other internal elements of the unit;
- Next, slide the original hub of your motorblock onto the shaft;
- Make a counterbore in the surface of the shaft for the bearing. As a result, the hub should be installed without the slightest gap, and the pulley itself should rotate freely around its axis;
- Then turn the crankshaft over and do the above steps on the back side of the crankshaft;
- Then make six holes in the pulley, using a drill with a 5mm drill bit. Observe the equal distance between the holes. Note that 10mm bolts will be screwed into the holes, so drill holes on the back of the pulley as well;
- Install the pulley on top of the flywheel, and bolt the two parts together. Next mark the places where the holes need to be drilled. Note that these must match the holes previously drilled in the pulley;
- Remove the pulley and drill small holes in the flywheel;
- Flatten the surface inside the flywheel and shaft so that the parts are not touching each other;
- The mechanism should include a clutch handle on a single axle tractor. To make it, take a tube, length 30 and a diameter of about 10 mm, and fasten it to the pulley;
- The clutch rope for the tiller can be taken from an old chainsaw, or you can buy a new cord and wind it on the spool.
Made by your own hands clutch is suitable for installation on Agro, Neva MB-2 motor blocks and agricultural machines of other brands.
How to make a clutch mechanism with your own hands?
Clutch on a single-axle tractor works on the principle that provides for increased friction of the components, so rapid wear can not be avoided. In this case, it is worth trying to make a mechanism with their own hands. The construction of a homemade clutch will be made up of:
- of the transmission’s primary shaft and the flywheel of the Moskvich car;
- Hub and knuckle from Tavria;
- Two-stranded idler pulley;
- Crankshaft from GAZ-69.
Subsequent work to assemble the mechanism is as follows:
- First you will need to grind the crankshaft so that it doesn’t snag the other parts of the power tiller;
- On the shaft we put the regular hub of the power tiller;
- Next you need to counterbore the bearing location on the shaft. This operation must be carried out as accurately as possible so that the bearing sits perfectly on the shaft. As a result, the hub should fit without any gaps, and the pulley should scroll;
- Then turn the crankshaft over and do the same on the other side of the crankshaft;
- Next, use a drill bit with a 5 mm bit to make six holes in the pulley. The distance between them should be the same. Since 10mm bolts will be used, you must also drill holes in the back of the wheel that drives the drive belt;
- Next place the pulley on the flywheel, and bolt both parts together. After that, mark the drilling locations on the flywheel so that they coincide with the 6 holes in the pulley;
- Remove the pulley and drill holes in the flywheel;
- After that, put the pulley back on and tighten the construction securely with bolts;
- Flatten the inner surface of the crankshaft and flywheel so they don’t bump into each other.
The finished construction can be installed on the regular place in the power tiller. Don’t forget to connect the cables, putting them as far away from the friction elements as possible.
How to make a clutch on a single axle tractor. the sequence of operations
The operating principle of the clutch system, regardless of its type, is based on the constant friction of the components. As a result, the assembly fails quite quickly. Buying a new quality mechanism is not a cheap pleasure, so many enthusiastic farmers prefer to manufacture the clutch system with their own hands. It’s not as difficult as it may seem at first glance, but you still need to prepare thoroughly before the work.
The first thing to do is to study the detailed drawings of the mechanism. They must necessarily specify the dimensions of each of the parts and the place of its installation in the structure.
After studying the diagram, you need to prepare the materials and tools available in the garage.
To assemble the clutch will be necessary:
- The primary shaft and serviceable flywheel. as a rule, these parts are taken from the gearbox of a Soviet Moskvich car;
- Slave pulley, on which two handles are pre-installed;
- Undamaged hub and metal knuckle of rotary type from the car Tavria;
- a whole crankshaft from the car GAZ-69.
The correct procedure for assembling the clutch mechanism for the existing motoblock is as follows:
- First you will need to carefully grind the taken crankshaft. As a result of reworking, the part should not touch other elements of the manufactured clutch of the motoblock;
- Then the factory hub of the motoblock must be installed on the used shaft;
- On the surface of the shaft it will be necessary to arrange space for mounting the bearings. After drilling the places, the hub should be mounted without any gaps. The traction sheave should be able to turn directly about its axis without difficulty;
- In the next step you must make six equal holes in the pulley, each with a diameter of no more than 5 mm. The distance between the holes should be the same. Note that inside the holes should be screwed bolts, each 10 mm long. Because of this, holes will also need to be made on the back side of the pulley;
- Then the pulley should be placed over the flywheel and both parts should be bolted together. It will then be necessary to mark the places for drilling holes. in the future the latter should coincide with the holes previously made in the pulley;
- After that, you need to pull the pulley and drill holes in those places on the flywheel, where the marks were previously set;
- After that it is necessary to grind the internal surfaces of the shaft and the flywheel so that the two parts do not touch each other;
- The clutch design must necessarily include a single-axle tractor clutch handle. To make it, you should use a tube with a diameter of about 1 and a length of 3 cm. In the future, the lever must be fixed on the surface of the pulley;
- To complete the mechanism, you will need a clutch cable for the tiller. For this purpose, you can buy a new cord, and then wind it on any spool, or take a whole rope with a serviceable spool from a household chainsaw.
Made in such a way, the homemade clutch is optimally suited for a set of motor-blocks of well-known brands Agro and Neva MB-2. The mechanism made by your own hands will serve for a long time without the need to perform repairs.
Replacement of the product
Replacement of this device is the most costly in financial terms. Although it is not necessary to change all components, experts recommend doing it at the same time. Let’s look at how the procedure is done:
- First of all, the parts are purchased.
- Next you need to completely dismantle the old product.
- Completely remove all clamps and remove the tensioning cable.
- After that the seating area should be cleaned.
- Next, the new parts are assembled into a single mechanism.
- The fixture is mounted in its seating.
- The tensioner is connected to the release bearing via a spring.
- The whole structure is fixed with the clamps.
At first glance, there is nothing difficult, but the process is complicated by the fact that it is necessary to remove the clamps, which also partially retain the transmission.
Important! Experts recommend replacing the entire device on the basis of practice, as over time, parts lapped and worn, so it is difficult to combine the new drive and the old basket, or vice versa.
Designation and Varieties
The clutch carries out inertial torque transfer from the crankshaft to the transmission gearbox, provides a smooth start of movement and gear shifting, regulates the contact between the gearbox and the motor of the motorblock. If we look at the design features, clutch mechanisms can be subdivided into:
According to the operating environment, a distinction is made between wet (in a bath with oil) and dry mechanisms. By mode of engagement, they differentiate between permanently closed and nonpermanently closed devices. By the way torque is transmitted. one stream or two streams. a distinction is made between single-flow and dual-flow systems. The design of any clutch mechanism includes such elements:
The friction clutch is the most popular clutch among farmers-owners of motor-block machinery because it features ease of maintenance, high efficiency, and long continuous operation. The principle is to exploit the frictional forces that occur between the contact faces of driven and driven parts. The drive components work in close connection with the engine crankshaft, and the driven ones. with the main shaft of the gearbox, or (in its absence) with the next transmission unit. The friction system elements are usually flat discs, but some models of power tillers have other forms. chock or cone.
In a hydraulic system, the torque is transferred through the fluid, which is pressurized by a piston. The piston is returned to its original position by springs. The electromagnetic clutch is based on a different principle: the system elements move under the influence of electromagnetic forces.
This type is regarded as permanently open. The centrifugal clutch type is used in gearboxes with automatic shifting. Not very widespread because of the rapid wear of parts and the long slipping time. Disc type, regardless of the number of discs, is based on the same principle. Robust and ensures the smooth startup/shutdown of the machine.
The belt clutch is characterized by low reliability, low efficiency and rapid wear, especially when used with high-power motors.