When operating in off-road conditions, tracked vehicles have undeniable advantages in front of wheeled vehicles due to its all-terrain qualities, allowing it to overcome deep loose snow, soggy arable land or rocky ford.
The popularity of tracked vehicles among residential users so great that many home craftsmen independently “re-shoe” their wheeled vehicles into homemade ones - caterpillars made from scrap materials.
One of the retrofitting options is to use old tires from MTZ tractors, allowing significantly increase cross-country ability personal auto and motorcycle equipment at minimal financial costs.
For a tracked vehicle of any purpose, be it a tank or a snowmobile, forward motion is provided by a tracked propulsion unit (CT).
It uses two motivating factors:
- torque Mk, transmitted from the engine/power drive to the drive wheels;
- adhesion of tracks to the ground.
A caterpillar or caterpillar chain of a main engine is a link structure, which is a continuous continuous belt or chain.
For full traction with the ground surface, the caterpillar equipped with relief protrusions, serving as active lugs.
The caterpillar principle is illustrated by the kinematic diagram of the main engine operation located below. The following positions are indicated on the diagram:
- pos. 1 – caterpillar;
- pos. 2 – support rollers that prevent the track belt from sagging;
- pos. 3 – drive sprocket (drive wheel), which converts torque from the engine into traction force necessary for the forward movement of the machine;
- pos. 4 – support rollers, ensuring full contact of the track belt with the surface of the ground support;
- pos. 5 – shock absorbers;
- pos. 6 – guide wheel, which serves to direct the forward movement of the machine and transfers part of its weight to the ground.
Movement according to the caterpillar principle carried out as follows:
- Torque Mk is supplied to the drive sprocket (item 3).
- The rotating sprocket rewinds the continuous track belt/chain (item 2).
- The caterpillar (item 2) is in close adhesion to the support surface (soil, loose soil, etc.). It is affected by:
- force R z – reaction supporting surface, which the caterpillar transmits to the vehicle frame;
- tangential reaction of the ground support P k.
The rewindable track belt/chain is continuously laid in the direction of forward movement of the vehicle on the surface of the ground support under the road wheels, creating for the wheels of the vehicle path with lower resistance to movement than on soft ground.
During movement, the caterpillar belt rises from the supporting surface and transfers the pushing force to the vehicle frame.
The specific pressure on the support (soil) along the length of the track is uneven - increased in the area of the drive sprockets, decreased in the front part in the area of the guide wheel (item 6). The maximum pressure on the ground from the main engine is in the area of the road wheels (item 4).
Advantages of homemade diesel engines from MTZ tires
Thanks to the continuous placement of the caterpillar belt under the machine's rollers, a big square contact of the belt with the ground, significantly reducing the average pressure of the machine on the soil.
The range of average pressure on the ground of equipment with deep pressure is from 11.8 to 118 kN/sq.m (from 0.12 to 1.2 kgf/sq.cm), which is significantly lower than the pressure of a human foot.
Such low pressure levels ensure that equipment is protected from sinking into the ground, swampy soil or snow. By varying the size of the surface area in the contact zone of the caterpillar with the support, we achieve optimal ratio cross-country ability of the vehicle with its traction force for towing cargo.
When equipping vehicles with caterpillar tracks, homemade DIYers use transport belts or tires from automobile and tractor wheels.
The photo below shows homemade all-terrain vehicle on tracks made of reinforced conveyor belt with a width of 250 mm. Grousers with a height of 25 mm are used.
All-terrain vehicle made from a conveyor belt:
For most craftsmen, the preferred source materials for the manufacture of diesel engines are old tires from MTZ tractors of various models.
Among the main advantages of MTZ tires are: source material, and the tracks themselves made from these tires, include the following factors:
- Availability old MTZ tires. Quite often, after dismantling, they are stored in the depths of the utility yards of enterprises, cluttering the territory.
- The tire is a closed continuous structure, does not require sewing the ends tapes.
- On a tracked platform made from a tractor tire no need to increase lugs, since the tires have a pronounced tread pattern of the factory design.
- MTZ wheel tires have high strength and wear resistance, ensuring reliable, trouble-free operation of the caterpillar belt on soils containing sharp stones.
- Versatility applications - you can select tires for all types of tracked vehicles, including measures to modernize equipment or increase the width of tracks.
- Recycling of used tractor tires solves the most important problem of recycling dismantled wheels - the possibility of their reuse.
From shortcomings When working with tractor tires, two circumstances are noted:
- limited fixed track length, determined by the size of the tire blank;
- the need to double two tires when installing a track with a width exceeding the width of one blank tire.
Requirements for converting equipment to caterpillar tracks
The picture shows simplest in design homemade cart with tracks made from tires.
The re-equipment of equipment for diesel engines is carried out exclusively for utilitarian reasons of pragmatic owners of wheeled vehicles or motor vehicles who wish improve all-terrain qualities their "helpers".
For all models of equipment intended for driving in field conditions, the market offers serial versions of industrially manufactured gas engines.
However, all this costs a lot of money, and tires free or very cheap.
Many equipment users manage to independently, in a home workshop, make tracks from tractor tires, install them on their machines and successfully operate in off-road conditions.
Regardless of the type of vehicle or motor vehicle, technicians take into account the following factors:
- To install the main engine mechanisms, it is necessary to equip special frame structures increased strength and rigidity, capable of withstanding increased weight and dynamic loads.
- When using improvised means, many craftsmen use pneumatic wheels as tensioners, as well as a pair of driving and driven wheels. The tape is put on the flat tires, which are then inflated, creating the required track tension.
- The owner of the equipment must clearly determine the purpose of the machine in order to select optimal sizes width and length of the caterpillar track.
- Taking into account the increase in weight and traction loads on the engine after installation of the main engine, it is necessary to optimize the correspondence between the maximum engine power and the width of the track. Otherwise the engine breaks down quickly.
When choosing the ratio of engine power and belt width of a homemade tracked installation you can be guided by price list data on all-terrain vehicles equipped with serial tracks.
Below we will consider the categories of machines that are most popular among craftsmen when re-equipping to crawler.
Main categories of popular equipment equipped with gas engines
List of models of household vehicles and motorcycles operating on loose snow and marshy soils, unusually wide.
The names of the machines themselves, accepted in everyday life, indicate their field of application.
Snowmobiles
This vehicle designed for movement on loose snow cover.
Unlike the anglicism “snowmobile”, which denotes any vehicle adapted for movement on snow (snowmobiles, all-terrain vehicles on tracks and pneumatic wheels, etc.), in Russia a snowmobile is only called means of ski-caterpillar movement(rear main engine, in front - skis instead of the front wheel) with motorcycle-type controls.
For utilitarian snowmobiles, the engine power is 30-40 hp, the track width ranges from 38 cm to 50 cm and even 60 cm.
Accordingly, if a master sets his task to create a machine for moving on virgin snow with a load, then he should focus on these indicators.
Similar parameters must be maintained when creating so-called snow and swamp-going vehicles.
If the master needs make a faster snowmobile(like sports ones), then the width of the tire track can be reduced.
The weight loads of a high-speed vehicle are much lower than those of a cargo utility vehicle.
The picture shows a motorcycle-based snowmobile equipped with a homemade 23 cm wide track cut from an excavator tire.
Otherwise, a homemade snowmobile track is made with your own hands according to the basic principle.
All-terrain vehicles
They are commonly referred to as any vehicle capable of driving off-road and even overcome water obstacles.
Types of all-terrain vehicles industrial production plenty:
- SUVs;
- swamp walkers;
- amphibians;
- tracked tractors and conveyors;
- ATVs;
- ATV category vehicles, etc.
Their cost not everyone can afford it, therefore, in home workshops they prefer to create their own exclusive products, “re-shoeing” their cars with tracks from tires made by themselves for an all-terrain vehicle.
Depending on the engine power of the vehicle, wider blades can be allowed.
For homemade all-terrain vehicles with an engine of 40-70 hp. and a small weight load, a tape width is enough 30-40 cm.
For vehicles based on UAZ vehicles with an engine of 110-150 hp. track width required 40 cm with support rollers (6 pcs.) and support rollers (3 pcs.).
Naturally, the profile height of a tractor tire will not be enough to overcome a water obstacle, it is necessary to install high lugs.
The figure shows an all-terrain vehicle based on the Oka vehicle with a caterpillar track made of tires.
Walk-behind tractors
Represented by numerous mobile devices based on a single-axle chassis. Converted for the State Duma homemade options walk-behind tractors are widely in demand among rural residents and owners country houses or summer cottages.
The motivation for independently re-equipping units, bypassing the purchase of serial tracks, is obvious.
The cost of the NEVA wheeled walk-behind tractor does not exceed 1000 dollars. USA, while the simplest cars adapted for driving on snow are estimated at 5-10 thousand dollars. and higher.
The drive power of the walk-behind tractor (5-8 hp) is quite enough to be successfully used as an all-season vehicle
Motorcycle dogs
Motorized towing vehicles, nicknamed motorized dogs in everyday speech, are a mechanical coupling of a sled with a towing vehicle on a main engine. The driver and cargo are placed in the sleigh.
Serial models are produced in a wide range of drive power (from 6 to 30 hp) and are equipped with a motor made of rubber-metal tape up to 60 cm wide.
Home craftsmen usually make towing vehicles based on a 15 hp engine from improvised means, installing tracks from tires 500 mm wide.
Such homemade motorized dogs are capable of transporting sleds with a load of up to 700 kg, reaching speeds of up to 40-50 km/h.
Most often, a homemade caterpillar for a motorized dog is made from a tire to save money.
The photo shows a homemade motorized towing vehicle based on a walk-behind tractor.
Algorithm for making a caterpillar belt with your own hands
The caterpillar track for any model from the above categories of equipment is made from tires of various sizes corresponding to the selected design. Let's look at how to make a caterpillar from a tire step by step.
The work on tape production is unified and follows a general algorithm.
Special knowledge in the manufacture of caterpillar tracks from tractor or car tire not required, however you can’t do without certain plumbing skills.
The process of forming a caterpillar track from an MTZ tire consists of several stages:
- Select a tire with a slightly worn tread.
- The path is being cut for the caterpillar using a sharpened shoe knife. Work with sharp knife is traumatic and requires increased caution and attention.
- To cut rubber better, it is recommended to use a knife periodically moisten with soapy water.
- Cutting with a knife can be successfully replaced jigsaw, protecting yourself from possible injury.
- Both sides are cut off tires.
- Excess material is removed from inside the tire.
The criterion for quality work is an even cut without frayed edges of the resulting tape.
So the track element is ready to use:
Video on the topic
You can see a homemade snowmobile track made from a tire in action in this video:
Conclusion
Making homemade tracks for converting equipment to caterpillar tracks is very popular way expand functionality machines at minimal cost.
Using dismantled old ones tractor tires for HD, it helps to solve the problems of recycling old tires without using traditional waste processing methods - burning, grinding, chemical treatment, etc.
In contact with
Making a motorized towing vehicle with your own hands comes to the minds of many people, especially in the northern regions of the country, where the snow cover remains stable and for a long time. Among the people, the slang name “motor dog” has been assigned to such a unit, meaning a sled dog sled. This is a compact, small-sized snowmobile tracked vehicle capable of towing a sled with a load or a person on a snowy surface. As a type of technology, it appeared relatively recently, about 20 years ago, but has already gained steady popularity. It is unpretentious, compact, does not require much space and special conditions storage
The presence of even homemade motorized towing vehicles can make life significantly easier, primarily for hunters and fishermen, as well as other lovers of active winter holiday. Assembling it with your own hands from available materials is much more cost-effective than buying a factory-assembled model. IN retail networks it costs a lot of money, but specifications However, they may not always meet the requirements of a particular consumer. To do this, you only need to have certain knowledge and technical skills.
Preliminary steps before assembly
Before you start assembling a motorized towing vehicle on your own, you need to decide what specific characteristics it will need to have. It is necessary to decide what load capacity it will have, what the required engine power is, what type of transmission will be, whether the engine will be started manually or with an electric starter. It is worth remembering that when assembling a motorized towing vehicle with your own hands, you can equip it with many additional accessories, meeting the specific needs of the owner. It could also be a winch different power, and additional light, circuit protection or something else. Perhaps you will just need a motorized towing pusher. Depending on this, you need to select parts and tools.
Then you need to make detailed drawings of the device and all its parts or select suitable ones from the literature or other available sources. Often such a drawing has to be adapted to existing parts and structures that are at hand and can be used. It is possible to order already ready set parts that you just need to assemble yourself. In this case detailed drawing included with the assembly instructions, as well as the complete technical description. But such a kit is not much different in cost from a ready-made factory-assembled motorized towing vehicle.
The stock of tools should be quite serious. This is primarily an electric drill with a set of metal drills, a grinder and a set of cutting discs for it, files, screwdrivers, spanners. Along with this, you will need a welding machine, as well as access to milling and lathes. The quality of assembly of homemade motorized towing vehicles usually depends only on the accuracy and technical skills of those who will assemble them.
Assembly of the base and selection of the engine
First you need to assemble the frame on which the engine, gearbox and chassis. For this purpose, you can take a metal beam or channel, from which a rectangular frame is assembled using a grinder and a welding machine. On it you need to make and weld mounts for the motor and gearbox from a steel angle. The engine can be installed completely different. It can be removed from the Ural or Druzhba chainsaw, as the manufacturers of the first homemade motorized towing vehicles did. It is possible to take a stronger one, from a domestic moped or an imported scooter.
The main advantage of the domestic Sh-58 engine, intended for installation on a moped, is the possibility of using a manual shift gearbox. If you install a foreign-made engine, you need to make sure that it is small-displacement and preferably two-stroke, since a four-stroke with the same power has a noticeable large mass. As for power, 6.5 liters is quite enough. s. to ensure a motorized towing vehicle speed of 30 km/h even in deep snow.
Installation of chassis and controls
The chassis of a motorized towing vehicle is based on support bearings. Based on the selected bearings, it will be necessary to machine lathe bushings having a wall thickness of 5 mm. With their help, support bearings are installed at the corners of the frame. The front and rear axles are turned on a lathe, forming shafts together with bearings and bushings. Most of the load on a motorized towing vehicle falls on the rear part, so the rear shaft needs to be made a drive shaft by putting a drive sprocket on it, secured by welding. It will be connected to the gearbox by a chain.
To make a caterpillar, a conveyor belt with a width of at least 22 cm may be suitable, which should preferably be reinforced with metal tires. You can also take a caterpillar from a Buran snowmobile, but to expand the chassis you will have to cut it in half and make inserts. Track tracks can be made from hard wood or you can remove 3 carriages along with rollers from the same Buran and also saw them and connect them with inserts. The engine and four-speed gearbox are equipped with pulleys connected by a belt drive.
It is advisable to equip the steering wheel with built-in controls, such as the clutch and gas handles, as well as the gearbox switch. It can be removed from a broken moped or scooter. The throttle lever is usually mounted on the right side, and the gearbox and clutch shift knob is on the left. The steering wheel itself is fixed to the frame by means of two pipes welded to a “P”-shaped fork. This fork is secured to the rear axle with steel washers secured by welding. As a result, there is practically no difference between the control of a motorized towing vehicle and a conventional moped.
This is how you can make a motorized pusher towing vehicle or any other motorized towing vehicle with your own hands. The only difference is attachments. To do this, it is quite possible to use various parts and assemblies from other technical devices and mechanisms that have become unusable. As a result, its cost will be quite low.
The consumer qualities of a homemade motorized dog are in no way inferior to models produced by the world's most famous manufacturers.
The “biting” prices for snowmobile equipment are forcing amateurs or professionals of winter hunting and fishing to make their own “sleighs”.
Motorcycle dog or motorized towing vehicle – perfect option active rest. Of course, the unit will be based on Buranovsky parts, but the main tool will be your hands and technical knowledge.
To create a motorized towing vehicle in your garage with your own hands, you should prepare: metal beams 20*40*120 of which welding machine preparing the frame.
We will weld a mount for the motor and gearbox onto the frame. The motorized dog will move with the help of a caterpillar.
To do this, we take the element we need from Buran. Cut it crosswise. This is done in order to expand its chassis.
The connecting elements are jumpers made of “U”-shaped metal profiles. The caterpillar is “required” to rotate by two axles, specially machined to our dimensions - 25 mm thick, 50 cm long. “Cheeks” are welded to them for attaching the drive sprockets.
In addition, support bearings are attached to the frame on both sides (two in front and two in back). They are inserted into support housings. Three carriages with rollers were taken from the Buran snowmobile to provide support for the tracks. They are first subjected to expansion; for this purpose, the sawn carriages are connected with inserts.
Prepared carriages are placed on the “ears” welded to the frame. We install the motor with a pulley, connecting it to a four-speed gearbox with a belt drive (there is also a pulley on the box).
For control, handles are installed from a pipe (1.5 cm, 120 cm long), tightened with jumpers (in an arbitrary arrangement).
A Buranovsky gas trigger is installed on the steering wheel. A corresponding cable goes from it to the carburetor. There is a lever on the steering wheel, from which comes a tension roller, screwed to the frame on a hinge. By tightening the belts, he sets the vehicle in motion. The structure is designed in such a way that it allows, if necessary, to manually replace the belt.
For a homemade vehicle to move at a speed of 30 km/h in deep snow, it is enough to take a 6.5 horsepower engine.
For safety reasons, a protective housing is placed on top of the motor. The installed shield is made of steel sheet (1.5 mm). To fill the fuel, a hole with a diameter slightly larger than the neck with a lid is cut from above the gas tank.
In addition, this technique is not without its convenient moments. Under the seat and with opposite side"secrets" have been installed
under various little things, which will be quite useful on the road, including food supplies.
The output is motorized towing vehicle homemade, with low weight, capable of moving on a snowy surface. Dimensions are relatively small (150x55x60 cm). With them, any transportation of a motorized dog is not a problem.
A motorized towing vehicle is an essential purchase in places where a car cannot pass - these are fields, forests, areas where there is deep snow most of the year. The advantage of this technique is that it has relatively small sizes, weighs little, can cope with various drifts, and also easily passes through hard to reach places. It is especially good to have a motorized towing vehicle for people who are interested in winter hunting, fishing, and also for transporting small-sized cargo and firewood. The device will be useful in winter and summer. You can buy a motorized dog in a store, however, if you don’t want to overpay, you can assemble it yourself.
What is a motorized dog for a walk-behind tractor?
The track attachment is represented by a module on which there is a seat for a person and a place for installing a walk-behind tractor. Instead of standard wheels The walk-behind tractor is mounted on tracks.
You can control a motorized dog while sitting on a trailer or standing on a sled. The motorized towing vehicle starts and stops by pressing the gas or clutch lever, which are located on the steering wheel of the walk-behind tractor. You can set turns and hold them using the steering wheel.
The motorized towing vehicle can be easily disassembled and can be easily stored in the trunk passenger car or in the garage. Making the device is as easy as disassembling it.
The assembly time of the motorized dog does not exceed 15 minutes. Does not require special care, easy to use.
IN Russian Federation launched the production of motorized dogs for walk-behind tractors. By purchasing a motor cultivator and tracks, you can make reliable device at home. The snowmobile attachment will help hunters, fishermen in winter time drive through impassable places. The motorized dog pulls up to 2 ski trailers and standard sleds weighing up to 150 kg.
Factory motorized towing vehicles
After the hype for tracked attachments, they began to be produced in our country. Motorized towing vehicles for walk-behind tractors Salyut (Agat) and Neva can rightfully be called one of the most popular.
Snowmobile attachments for Salyut (for example, model SP-MB-S) and Neva (models SP-MB-2, SP-MB-23 and others) began to be produced 15 years ago and managed to win the hearts of many people for their ease of use and simple repairs .
Due to its small parameters, the motorized dog can be easily kept in the garage and transported by car.
Walk-behind tractors have a small engine, so it is better to buy a two-track attachment for them. Each track has holes, and standard models have the usual 2 plastic sprockets on the axle, where the tracks are mounted. Such technical point is more practical, since motorized dogs often break down due to this problem.
But there is significant drawback: the engine has low power(7 l), so acceleration will be no more than 20 km/h, or even lower. It is difficult for these models to pull several drags, because... they are lightweight options. When choosing a tracked attachment, you need to pay attention to this fact, because The devices are not suitable for heavy loads.
Do-it-yourself motorized towing vehicle for a walk-behind tractor
It’s not difficult to make a motorized towing vehicle yourself. It is important to decide on the engine. You can buy both domestic and foreign engines. Yamaha and Honda engines have good performance reviews. They are universal, so they will fit any device model. As for the caterpillars, you can make them yourself; you only need materials, a little time and patience.
Homemade tracks for a snowmobile attachment
There are many ways to make a caterpillar, but today we will tell you how to make it from V-belts and chains. To do this, we take belts, fasten them to lugs or wheels, thus getting simple homemade tracks.
The assembly of a caterpillar from chains is no less simple. You need to take two identical chains, find the last links, open them and bend them to form a vicious circle. Then we fix the links and weld them with a soldering iron. Reinforcement of chains is done made from steel plates. They are secured with bolts. For presentation, you can see the diagrams:
If you don’t want to do it yourself, you can simply take a caterpillar from other unnecessary equipment.
More details about. or other materials, is written in a separate article.
Assembling a crawler attachment for a walk-behind tractor
When assembling a snowmobile attachment, you need to outline a drawing that will prevent unnecessary errors.
- First you need to select support bearings, and machine bushings for them.
- We take a welded frame in which the pipes will be located, and fill them with sand to give the required shape.
- We cover the 2 ends with wooden plugs, place them in a vice and slowly begin to bend it using a soldering iron. The bend should be maximum, so in order not to make a mistake, it is better to make a template that you can use as a guide.
To make it easier to imagine, you can familiarize yourself with the diagram:
It’s easy to make a snowmobile attachment; you just need a little time, ingenuity and provide for all the little things, since saving on good equipment is stupid. A self-assembled motorized towing vehicle will serve without interruption.
The general design is not complicated and anyone who knows how to hold a tool in their hands can make a motorized dog with their own hands (see the end of the article for drawings and explanations).
The great popularity of light motorized towing vehicles is due to the fact that, coupled with a fairly compact size, they have excellent maneuverability, are unpretentious in maintenance and consume little fuel.
Let's try to figure out what a motorized dog is? Essentially, it is a small motorized crawler unit that is designed to tow small loads.
Engine selection and installation
Most important element homemade is the engine. In our case, we chose the fairly common domestic moped motor Sh-58, the main advantage of which is that it is designed to use a manual gearbox switch.
Homemade motorized dog
It is also worth noting that foreign-made engines can be successfully used in homemade motorized dogs. Especially, small-displacement engines from Yamaha and Honda are in demand.
The main feature of these internal combustion engines is their versatility; they are perfect not only for creating a homemade motorized towing vehicle, but also for large quantity other devices, ranging from small power plants to homemade walk-behind tractors.
As for the number of strokes, two-stroke engines are best suited for them, which, compared to their four-stroke counterparts, have smaller dimensions and weight, while their power characteristics approximately the same.
Don’t forget about the motorized dog controls. Here, a steering wheel with built-in controls is best suited, that is, with a gearshift switch, gas and clutch handles from old motorcycles.
Before starting to assemble the chassis, it is necessary to select support bearings, after which bushings are machined under these bearings. As load-bearing structure a welded frame is used, consisting of water pipes various diameters. To give the pipes the desired shape, they are first filled with dry sand and tightly sealed with plugs.
Consumption no more than 2 liters per 100 km
The workpiece is then placed in a vice and slowly, using blowtorch, bends into in the right places. In order for the bend to be even, a reference template made of plywood is used.
After all the frame elements have acquired the desired shape, they are fastened together using welding clamps.
This is done specifically so that if defects occur during the assembly stage, they can be easily corrected. After all defects have been eliminated, the frame is finally fastened together by welding.
Sheet steel blanks are ideal for installing the engine on the frame. Such blanks are made using cardboard templates pre-fitted to the frame. First of all, the blanks are fixed to the engine, after which the resulting structure is attached to the frame with welding points. The engine is then disconnected from the workpiece and finally welded to the frame.
Our tracked unit will use collapsible shafts made of bushings, bearings and the shaft itself. As mentioned earlier, bushings are specially machined for bearings, and the thickness of the bushing walls should not exceed 5 mm. Due to the fact that the greatest loads in a homemade motorized dog fall on the rear axle, we make it the leading axle. To do this, a drive sprocket is welded to the rear shaft, which is connected to the gearbox via a chain drive.
In addition to composite shafts, motorized dogs also use composite wheels. Each of these wheels consists of two cheeks 3 mm thick and several dozen lugs made of small steel pipes. In order for the wheels to better dampen vibration, rubber bushings are inserted into the ends of the lugs.
Mover
For the manufacture of tracks, a conveyor belt with a width of at least 220 mm is best suited. The tracks for our walk-behind tractor are made of smooth birch slats 1260 mm long. To strengthen the structure of the tracks, you can use steel ridges that are attached to birch bars. The track parts are fastened with M6 threaded bolts.
Homemade caterpillar
The process of controlling a homemade motorized dog is practically no different from driving a moped. On the right handle of the steering wheel there is a gas handle, and on the left there is a clutch handle and a gearshift lever. By the way, the steering wheel is attached to the frame using two pipes, which in turn are welded to a U-shaped fork. The fork itself is attached to the rear axle of the walk-behind tractor using steel washers welded into it.
Due to the fact that the motor of our motorized towing vehicle is located inside the caterpillar, it cannot be started using a standard kickstarter, so it had to be slightly modernized. To do this, you need a fairly long piece of pipe, at the end of which we make a slot of such a size that the lever drive can easily fit into it. Then, using regular welding, we attach the pipe and the kickstarter lever.
Drawing of a motorized dog
Explanations for the drawing: 1-front driven wheels; 2-track lugs (birch slats 35×75-1260 mm); 3-threaded rods M8x170 mm with nuts; 4-upper part of the frame ( steel pipe 30×2 mm); 5-front engine mount (steel strip 2.5 mm thick); 6-comb (steel strip 3 mm thick); 7-reinforcing element ( steel sheet thickness 2.5 mm); 8-post (steel pipe 30×2 mm); 9-plug (steel pipe dia. 22×2.5 mm); 10-fuel tank (2.5 l polyethylene canister); 11-control elements of the tracked unit (on the left: clutch handle and gearbox switch, on the right - pelvis handle); 12-steering wheel (from any brand of moped); 13- fuel tank support (steel strip 2 mm thick); 14-fuel tap with sump (from any moped); 15-fuel line; 16-drive shaft bushing; 17- hook; 18-sleeve (piece of rubber hose); 19-outer cheek of the wheel (duralumin sheet 3 mm thick); 20-washer; 21-fork washers; 22-pin; 23-drive shaft (steel pipe diameter 30×2.5 mm); 24-flange (steel sheet 3 mm thick); 25-pin (steel bar dia. 10 mm); 26-inner cheek of the wheel (duralumin sheet 3 mm thick); 27-rear drive wheel; 28 control system cables; 29-track drive chain; 30-rear engine mount (steel sheet 2.5 mm thick); 31-engine type B-50; 32-muffler (thin-walled steel cylindrical container 0130 mm with holes 20 mm in diameter); 33-lower part of the frame (steel pipe 30×2 mm); 34-front driven shaft bushing; 35-bolts M8x55 mm with nuts; 36,40 - bushings; 37-bearing; 38-adapter; 39-bushing; 41-bushing; 42-leading chain sprocket; 43-rubber-fabric tape (thickness 6 mm, width 220 mm).