Do-it-yourself overrunning clutch for a tiller

tiller with differential: overrunning clutch and unblockers, how to make a lock with your own hands. drawings

An integral part of the power drive of any vehicle with multiple wheels on one axle can be considered a differential for a tiller. The purpose of this mechanism is to distribute power between the wheels depending on rolling resistance, which is extremely necessary when cornering.

Since the wheel passing the outer arc of the turning trajectory, in the same time, travels a longer distance than the wheel following the inner arc, it must rotate faster, otherwise it will slip.

Simple construction for a tiller

Many farmers, when using conventional equipment, often think about how to make a differential on a tiller with their own hands. A similar idea can visit the master when an old element breaks. There are no special difficulties in making a differential for a tiller with your own hands. But still, to begin with, you should stock up on a suitable scheme or prepare drawings.

Those who are thinking about which type of differential to choose for a tiller should remember that this type of equipment does not require long rotation of the wheels about the axle. That is why you can choose the simplest options.

Often, universal differential systems are used for tillers. They make it possible to deviate the wheels from the axis by a certain degree.

In the simplest version, you need to take a bushing with a transverse slot and insert a short axle into it. The last element is necessarily fixed with a bolt, and after that it is attached to the wheel structure. This system works quite simply. The drive axle must turn the bushing until it stops, that is, until it comes into contact with the bolt. It is worth noting that with this element the master can initially set the most suitable wheel angle for him, which also depends on the size of the slot.

A feature of such a detail is its maximum simplicity. You don’t have to be an experienced craftsman or mechanic to make such a differential for your tiller. It is enough just to have certain skills of working on the machine. This will be enough to obtain the basic elements that are needed to make such a differential.

Why would a tiller need this element

The tiller wheel, which follows the outer arc when cornering, has to travel a longer distance. And here there is a need for a differential or other mechanism for distributing power, which will avoid slipping. If this element is not in the wheeled device, it will cause a straightening of the movement. over, the greater the distance between the wheels, the more difficult it will be to turn.

Most of the work that is carried out on the ground, for example, cultivation or fertilization, is carried out in a straight line. But this does not mean at all that the device will never turn. Of course, the standard version of the tiller with a rigid 2-wheel drive makes it quite convenient to use in most agricultural work. But if frequent turns are necessary, the problem with slipping and steering will have to be additionally solved. If you do not use special mechanisms, the vehicle will brake with lugs. Such work will be difficult even for a person with great physical strength.

Most often, experts choose the use of overrunning clutches as a solution to this issue.

These are simple and versatile settings that allow you to correctly distribute the load between the wheels when you need to turn the tiller. The versatility of this method lies in the fact that overrunning clutches can be used not only on a rigid axle, but also on a connected one. In this case, when turning, the wheel will tend to rotate faster than the front shaft. This makes it possible to conveniently control the machine and work even in small areas, as the device becomes more maneuverable.

Axle extension

It is better to use the bolt connecting the components of the extension with a head for an internal hexagon and mill a groove with a width equal to its outer diameter.

In this case, firstly, there are no protruding parts capable of winding grass around themselves, and secondly, the bolt tightened to the stop will not loosen over time.

The gap between the bushing and the extension shaft must not be made too small, since they will touch each other if corrosion occurs. It is highly desirable to place a grease fitting on the sleeve for CIP lubrication of the structure.

complex pivoting hub design can also be made from mild steel as it weld easily.

Finishing of the bearing bores in the hub must be done after the flange and steering angle stop have been welded to it due to the inevitable warping of the part during welding.

The invested labor costs will quickly pay off by facilitating the operation of the tiller.

General Tips

Let’s start with the simplest option in the form of an axle extension with a transverse groove. It will be reasonably reliable even when made from affordable mild steel.

CRAFTSMAN 2HP TILLER Transmission/Gear Box Repair-DONT THROW IT AWAY

Differential for tiller. how it works and what it is capable of

Diary entry created by user CaimanTeh, 02/26/15
Views: 33.353, comments: 10

Recently, a video of the Caiman Vario tiller with a snow thrower was posted on YouTube. During the story about the features of the winter use of the tiller, “additional differentials” installed on the wheels were mentioned.

To demonstrate the differentials, Denis turned the tiller back and forth. The demonstration was short, but this option interested the participants of the topic Moto Cultivators Pubert Caiman

The topic seemed to quickly figured out what kind of additional differentials for the tiller were, but since the question arose, I decided to make a small photo report. After filming, the demo tiller with a differential was filled with gasoline and oil, so it was taken to the service room. It is cramped there, there are many other equipment around, so it did not work out to twist it. All I got from Caiman Vario was a photograph.

Differential for Caiman Vario Tiller

So, these are the differentials, or rather the semi-differentials installed together with the standard rubber wheels in size 4.00-8. (The set of two semi-differentials is called VARIO / Q Junuor / Q Max Tiller Differentials with Extension and has the code R0101.)

How is it done

The design of such differentials for tillers (and motor-cultivators, by the way, too) is extremely simple:

• the wheel hub is not fixed to the axle
• there are protrusions on the axle and hub (indicated by green arrows) that prevent the wheel from turning a full revolution

How it works

During normal tiller movement, the protrusion on the axle abuts against the protrusion on the hub and transfers the rotation to the wheel. In this case, both wheels will rotate at the same time.

But if you push the tiller forward, the differential hubs will act like overrunning clutches, and the lugs on the wheels “run away” from the lugs on the axle. They will not be able to run far. having made an almost full turn, the protrusion on the hub will burrow into the protrusion on the axle, but this is also enough to perform the maneuver.

After completing the turn, a tiller with a differential will be able to drive only on one wheel until the protrusion on the axle of the second wheel “catches up” with the protrusion on the hub. It is also possible to slip with one wheel until the “unlocked” one comes into working condition.

Why do you need tiller differentials

In simple terms, the tiller needs the differentials to turn at the end of the furrow. This is how the same Caiman Vario unfolds on grousers and without differentials.

To turn the tiller and return to the cultivated area, the lugs have to be dragged along the ground. And here it all depends on the weight of the tiller (or motor-cultivator) and the strength of the operator.

At the end there will be a video showing how differentials make this task easier.

Differentials on Tiller Pubert Quatro Junior

Above there was a picture with a differential hub that is different from that installed on the Caiman Vario. in the showroom there was another tiller with a similar design of differentials.

Differentials on Tiller Pubert Quatro Junior

Unlike previous domestic differentials suitable for several models, these are part of the native French “Plowing Kit” (code 8000010205) for the Quatro Junior and QJ V2 models (Caiman, Pubert and MasterYard, including models with a diesel engine), which includes includes:

• differentials
• wheels 5.00-10
• weighting agents
• reversible plow

Quatro Junior with such a kit has a wide track and a weight of over 100 kg. In order to deploy it with locked wheels, you need to be either very strong or very stubborn. In any case, such a turn at the end of each furrow will take a lot of time and effort.

Being with tillers, in about the same weight category, I decided to wrestle with him. To do this, I rolled it out to an open area in the showroom.

Testing Differential Capabilities on a Tiller

I filmed the testing. There were several samples, one of them got on the video. The video clearly shows how the wheels rotate during the turn.

The maximum turning angle is 270 degrees (3/4 turn), the minimum is 180 degrees (1/2 turn). In real work, it is best to rely on the minimum value. The 270 degree turn was possible due to the artificiality of the situation and the pushing of the tiller back and forth. Although, in real life, a reversal of 3/4 of a turn is possible.

Rubber wheels creak terribly on marble when turning, and when locked, they do not move at all. This can be seen in the video at the beginning and at the end of the spread. Attempts to move this centner with locked wheels did not lead to anything.

Yes, in a real situation, on grass, the wheels will slide better than on marble, but it will still be quite a specific entertainment.

P.S. In addition to the differentials, the plowing kit includes an interesting reversible plow from the Ribas company. I photographed it for a long time, I hope I will post it here soon with explanations.

Added on 2017-02-02 About the plow, my hands still do not reach to write, so a small video of a tiller with a differential and a reversible plow is:

Power distribution options

Structurally, the simplest way to solve the problem arising from the rigid connection of the wheels is to use overrunning clutches, which allow the wheel to rotate faster than the axle driving it.

Differential need

Many works performed with a tiller (for example, cultivation) assume its rectilinear movement. In this case, the rigid drive to both wheels works great, significantly reducing the cost and simplifying the tiller.

If you need frequent sharp turns, a tiller of this type will require the application of noticeable physical efforts. one of the wheels will brake with lugs, and the tiller will have to tilt, hanging the outer wheel in the air.

This is especially difficult if the tiller has a wide track and a large enough weight.

How to make a homemade differential for a tiller with your own hands. drawings

How to make a differential for a tiller with your own hands? As a rule, the operation of the tiller does not require long-term rotation of the wheel relative to the drive axle.

Due to this, often called “semi-differential” schemes are common, which provide the ability to freely rotate the wheel about the axis at a certain angle.

For more details on the “half-differential” see

The simplest mechanism in this case looks like a bushing with a transverse slot attached to the tiller axis. A short axle is inserted inside this bushing, secured from falling out by a bolt wrapped in its body through a slot, and a wheel is attached directly to the axle.

At the same time, when the tiller moves, the drive axle turns the bushing freely until the rear edge of the slot rests against the bolt, and then transmits torque through it to the axle.

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During the turn, the wheel, trying to overtake the drive, moves the bolt forward along the slot, breaking the transmission of torque, and the angle of easy rotation of the tiller depends on the length of the slot.

Such extension cords are extremely simple and can be made by unskilled machine operators, and therefore are cheap and widespread. Usually they are made with several additional holes, allowing you to vary the tiller track width and rigidly connect the wheel to the drive axle if necessary.

Blueprints of these homemade differentials are widespread on the internet.

The disadvantage of the described design is the relatively small possible angle of free rotation of the wheel (no more than 240 degrees), since the transverse groove greatly reduces the overall strength of the mechanism, and high internal friction, especially when dirt is inevitable inside the hub.

Freewheel extensions are most commonly used on light tillers like the Niva.

Differential for tillers Salyut and the likes of Texas, Foreman, Viking, Forza, Sadko, Don, Huter, Profi, having a relatively large mass, has a slightly more complex design, but also a larger freewheel angle. within 330 degrees.

This is ensured by the fact that the engagement is carried out by protrusions on the drive axle extension and on a freely rotating hub fixed thereon, equipped with ball bearings. Accordingly, the hub can make almost a full revolution about the axis until it rests against the opposite edge of the protrusion.

It is noticeably easier to deploy a tiller with such differentials.

A number of designs allow the wheels to rotate freely about the axis and more than one revolution. For example, the Farmer tiller differential consists of two clutches controlled by levers on the steering wheel.

If necessary, the owner of the tiller can disengage the desired clutch, allowing the corresponding wheel to rotate as long as desired.

General Tips

Let’s start with the simplest option in the form of an axle extension with a transverse groove. It will be reasonably reliable even when made from affordable mild steel.

Overrunning clutches

This mechanism is well known in all its variations: both with a ratchet mechanism (bicycle wheel hub) and wedging by rollers (electric starter bendix).

Overrunning clutches are also used in the power drive of a number of vehicles with connected axles. However, such a solution has a characteristic feature: when cornering, the overrunning clutch is disconnected at the wheel running along the outer radius, since it tends to rotate faster than the drive shaft.

To facilitate entry into a turn, on the contrary, most of the torque should be imparted to him.

Tractor PTO Over Running Clutch / Coupler

This problem is solved in the classic gear differential, which distributes power in inverse proportion to the resistance to rotation of the wheels.

But it is also noticeably more difficult to manufacture, and also requires forced full or partial blocking on the off-road, since otherwise it redistributes all the power to the trailing wheel.

Power distribution options

Structurally, the simplest way to solve the problem arising from the rigid connection of the wheels is to use overrunning clutches, which allow the wheel to rotate faster than the axle driving it.

tiller with differential: overrunning clutch and unblockers, how to make a lock with your own hands. drawings

An integral part of the power drive of any vehicle with multiple wheels on one axle can be considered a differential for a tiller. The purpose of this mechanism is to distribute power between the wheels depending on rolling resistance, which is extremely necessary when cornering.

Since the wheel passing the outer arc of the turning trajectory, in the same time, travels a longer distance than the wheel following the inner arc, it must rotate faster, otherwise it will slip.

Thus, an axle devoid of a differential will tend to straighten its movement, and this effect is expressed the stronger, the greater the distance between the wheels.

Axle extension

It is better to use the bolt connecting the components of the extension with a head for an internal hexagon and mill a groove with a width equal to its outer diameter.

In this case, firstly, there are no protruding parts capable of winding grass around themselves, and secondly, the bolt tightened to the stop will not loosen over time.

The gap between the bushing and the extension shaft must not be made too small, since they will touch each other if corrosion occurs. It is highly desirable to place a grease fitting on the sleeve for CIP lubrication of the structure.

complex pivoting hub design can also be made from mild steel as it weld easily.

Finishing of the bearing bores in the hub must be done after the flange and steering angle stop have been welded to it due to the inevitable warping of the part during welding.

The invested labor costs will quickly pay off by facilitating the operation of the tiller.

Do-it-yourself overrunning clutch for a tiller

OVERTAKING INSTEAD OF DIFFERENTIAL

I (like, probably, many others in a similar situation) felt the need to have a nimble and reliable motorcycle assistant at my personal disposal with particular acuteness when I became the owner of a summer cottage. There were not enough forces and resources for a mini-tractor, so I decided to limit myself to a tiller, focusing on the developments that I found in the files of the “Modelist-Constructor”. He got down to business creatively. As a result. good luck, information about which was published in “Photopanorama” (“Modelist-Constructor” No. 10, 1984). The first self-assembled tiller was followed by the second, the third. And now. the fifth, successfully proven in practice design (Fig. 1).

the tiller is made with the maximum use of industrial parts and assemblies. In particular, the sprockets and the PR-15.875 chain are from decommissioned agricultural machinery. As, however, and overrunning clutches with rubberized wheels. As the latter, the “undercarriage” from the GP-14 rake serves well. But it is quite possible to adapt what the creators of the widespread industrial tiller “Krot” offer through the trading network.

The “energy heart” of the design under consideration is the T-200 power unit (or similar to it, as, for example, on the “Ant” cargo scooter). ). over, the housings of these bearings are attached to the welded frame-silencer with M10 bolts, “locked” nuts with Grover washers.

Fuel is supplied to the engine by gravity. from a gas tank (taken from a motorbike) mounted on a jib bracket (rear) and two 200 mm M8 studs (front). As shown by many years of operation, such a technical solution is fully justified.

In order for the tiller to “behave” sufficiently stable while driving, the transmission of torque to the running wheels is usually done through a differential. However, I did it differently. Instead of an expensive differential, he risked using overrunning roller clutches from a decommissioned grain seeder. If you have certain turning and locksmith skills, of course, you can do them yourself. over, in each there are only three (Fig. 5) basic, not so difficult to manufacture elements: a cage, a hub and a triad of rollers acting as a whole.

When the hub rotates clockwise, the rollers automatically roll into the tapering cavities and wedge. As a result, the coupling halves of the couplings occur to transmit torque in the required direction. If the driven part overtakes the leading, then the rollers roll out of the cavities, disengaging the “kinematics”.

Another version of the tiller, using a home-made ratchet overrunning clutch, has proven itself quite well. The hub for it is made of structural steel and is mounted on the output shaft by means of bronze bushings, pressed with an interference fit and then stamped. A grease nipple is provided for lubrication.

From axial displacement, the hub is limited on one side by a retaining ring, on the other. by the freewheel body itself. Between them, in order to reduce friction losses, bronze thrust washers with a thickness of 2.0 mm are installed.

A flange is welded to the hub for fastening the disk of the travel wheels (marking of four holes on the latter. along the disk). A ratchet is pressed onto the other end of the hub, which is kept from turning by a parallel key. It is made of a sheet of carbon steel 20 mm thick, has 12 teeth 7 mm high, fitting into a circle with a diameter of 74 mm.

The freewheel housing is fixed on the output shaft by three set screws located in the same plane at an angle of 120 ″ to each other, for which the appropriate recesses are made. The driven sprocket is attached to the disc with five M8 bolts (the hole markings on the disc are along the sprocket holes). The pawl axis (Fig. 6) is pressed against the ratchet by a spring.

The steering unit is sliding, made of two pairs of steel seamless cold-rolled tubes, which fit into each other. It is mounted on the frame by means of a hinge joint, which allows the tiller to rotate in the vertical plane by 80 °. This makes it possible to carry out soil cultivation directly near shrubs and under the crowns of fruit trees. On the right handle there is a “throttle” lever, which regulates the position of the throttle valve. There is a “clutch” lever on the left handle.

muffler frame, 2. kickstarter lever, 3. power unit, 4. intermediate shaft assembly, 5. sprocket of the first stage of chain transmission, 6. gas tank, 7. steering unit, 8. gear shift lever, 9. right handle with a gas lever, 10. a left handle with a clutch lever, 11. a seat, 12. a box with a tool. 1 3. “front end” of the cargo trolley, 14. trailer brake pedal, 15. running wheel (2 pcs.), 16. freewheel (2 pcs.), 17. sprocket of the second stage of the chain transmission, 18. duckfoot paw of the cultivator (2 pcs.), 19. cultivator stand (2 pcs.), 20. D-shaped beam.

power unit Т-200, 2. chain drive, 3. intermediate shaft, 4. self-aligning bearing І 1680206С17 (4 pcs.), 5. output shaft, 6. running wheel (2 pcs.), 7. roller overrunning clutch (2 pcs.); a. variant with a ratchet freewheel.

inlet branch pipe (“stainless steel”, pipe 50x 1.5 L30), 2. vertical bracket (St3, strip s5). 3. outlet branch pipe (“stainless steel”, pipe 20 × 1.5 L30), 4. “eyelet” (St3, strip 6 pcs.), 5. inclined bracket (St3, sheet s5), 6. sealing partition (St3, sheet s1,5), 7. sidewall of the docking unit (StZ, sheet s5, 2 pcs.), 8. crossbar (StZ, channel 100 × 46 L60), 9. output shaft bracket (StZ, sheet s7), 10. cover silencer (StZ, sheet s1.5), 11. spinal beam (steel channel 160 × 64 L600).

backbone beam, 2. self-aligning bearing 1680206С17 (2 pcs.), 3. intermediate shaft, 4. M10 bolt with lock nut (4 pcs.).

clip (steel 20X, НRS 56. 62), 2. hub (steel 20Х, НРС 56. 62), 3. roller (steel ШХ15, НРС 30. 40, 3 pcs.), 4. cheek (steel 45, sheet s2.5, НRС 30. 40, 2 pcs.), 5. prismatic key (steel 20ХН), 6. split lock washer (2 pcs.), 7. spring (steel wire 0.5 3 pcs.).

sprocket (steel 20ХН, z = 45 and t = 15.875), 2. body (St3), 3. M12 mortise screw with lock nut (3 pcs.), 4. disk (steel 20), 5. pawl axis ( steel 40ХН), 6. washer, 7. cotter pin, 8. pawl (steel 20ХН), 9. ratchet (steel 20ХН), 10. bushing (Br05Ts5S5, 2 pcs.), 11. grease nipple, 12. persistent washer ( BrOBTsbSZ, 2 pcs.), 13. M10 mortise screw with lock nut (2 pcs.), 14. locking ring (StZ), 15. flange (StZ), 16. hub (steel 45), 17. casing (StZ). 18. M8 bolt with a punctured nut (5 pcs.), 19. spring (steel wire, 0 0.8), 20. prismatic key 4x4x18 (steel 45), 21. output shaft (steel 45).

main bar (steel pipe 30 × 2.2, 2 pcs.), 2. “ear” (StZ, sheet s5, 2 pcs.), 3. bushing (steel pipe 34 × 2, 2 pcs.), 4. adjusting bar (steel pipe 25 × 2.2, 2 pcs.), 5. left handle (with the “clutch” lever from the scooter), 6. right handle (with the “gas” lever from the scooter), 7. perforated trapezoid ( StZ, sheet sЗ), 8. welded M8 nut (2 pcs.), 9. M8 locknut (2 pcs.), 10. M8 locking bolt (2 pcs.).

The gear lever is on the right side. Moving it forward, include the working speed, and moving it towards itself. the transport.

As already noted, the tiller uses a 14 hp T-200 power plant. with forced air cooling. It is mounted on the frame using vertical and inclined brackets made of 5 mm thick steel strip and three pairs of “ears”, holes in which are made on site during assembly. The tension of the PR-15.875 chains in a two-stage transmission is carried out by moving the intermediate shaft in the grooves of the center beam. The output shaft, like the intermediate shaft, also rotates in bearings 1680206С17, only they are located at the bottom of the frame and are fastened using conventional bolted connections.

The entire drive is arranged in such a way that the center of gravity of the machine in the longitudinal and transverse directions provides the maximum balance of the structure. A little operator pressure on the steering levers is sufficient for this.

In addition, it was possible to practically avoid the occurrence of additional loads on the front of the load-bearing beam of the trailer when using the tiller as a vehicle, which is fully consistent with the idea underlying the entire structure as a whole. After all, the machine was conceived as a kind of mini-tractor for work mainly related to the movement of goods: with an improved cart from the “Ant”, with a comfortable (from PAZik) seat (tool box), with a reliable swivel drawbar and an increased capacity of almost a ton.

Tiller fully met these expectations.

As for tillage implements, their hitching is carried out using a D-shaped bead (see Fig. 1), installed in a box-type hitch, rigidly fixed with two fingers with a diameter of 20 mm.

S. SHIRYAEV, Bekabad, Tashkent region.

Overrunning clutch for tiller

Differential overrunning wheel hub device for homemade tiller wheels

Considering that the tiller always works on uneven hilly terrain and its wheels cover different distances, this discrepancy between the tiller’s wheels must be somehow eliminated. The role of the differential on the tiller can be performed by an overrunning clutch, the device of which is shown in the drawing. A drive sprocket is welded onto the wheel axle, a ball bearing assembly with a housing and a ratchet freewheel are installed. The principle of operation of the ratchet freewheel clutch of the tiller wheel is based on the transmission of rotation through a spring-loaded pawl engaging with the ratchet tooth of the wheel hub of the tiller wheel. When the rotational force transmitted from the engine to the wheel is stable, it compresses the spring of the overrunning clutch pawl and it is in engagement with the ratchet tooth of the hub. torque is transmitted to the wheel. As soon as the force weakened for any reason (the wheel ran into an obstacle or the tiller turns), the overrunning clutch spring is released and the pawl jumps to the next ratchet tooth of the motor-block hub, the wheel slip in place.
The drawing of the overrunning ratchet clutch of the differential hub of the tiller wheel shows:
1- tiller wheel axle, metal shaft; 2- drive sprocket; 3, 4, 5, 6. wheel axle ball bearing assembly; 7- overrunning ratchet wheel hub clutch; 8- axis of rotation (installation) of the ratchet clutch pawl; 9- overrunning clutch dog; 10. ratchet of differential tiller clutch; 11. two ball bearings (07); 12- two spacer washers for ball bearings; 13- wheel of a homemade tiller; 14- spring of the pawl of the overrunning differential clutch of the wheel of the tiller

Simple construction for a tiller

Many farmers, when using conventional equipment, often think about how to make a differential on a tiller with their own hands. A similar idea can visit the master when an old element breaks. There are no special difficulties in making a differential for a tiller with your own hands. But still, to begin with, you should stock up on a suitable scheme or prepare drawings.

Those who are thinking about which type of differential to choose for a tiller should remember that this type of equipment does not require long rotation of the wheels about the axle. That is why you can choose the simplest options.

Often, universal differential systems are used for tillers. They make it possible to deviate the wheels from the axis by a certain degree.

In the simplest version, you need to take a bushing with a transverse slot and insert a short axle into it. The last element is necessarily fixed with a bolt, and after that it is attached to the wheel structure. This system works quite simply. The drive axle must turn the bushing until it stops, that is, until it comes into contact with the bolt. It is worth noting that with this element the master can initially set the most suitable wheel angle for him, which also depends on the size of the slot.

A feature of such a detail is its maximum simplicity. You don’t have to be an experienced craftsman or mechanic to make such a differential for your tiller. It is enough just to have certain skills of working on the machine. This will be enough to obtain the basic elements that are needed to make such a differential.

Tiller wheel hub ratchet differential

Open the photo Tiller wheel hub ratchet in enlarged view. If this is a drawing or a diagram of a device, you can download it to your computer by opening it in large size and using the “Save picture as. “(Right mouse button).
Please rate this material by marking the appropriate number of stars.

Most often with this material

Differential for tiller. how it works and what it is capable of

Diary entry created by user CaimanTeh, 02/26/15
Views: 32.808, comments: 10

Recently, a video of the Caiman Vario tiller with a snow thrower was posted on YouTube. During the story about the features of the winter use of the tiller, “additional differentials” installed on the wheels were mentioned.

To demonstrate the differentials, Denis turned the tiller back and forth. The demonstration was short, but this option interested the participants of the topic Moto Cultivators Pubert Caiman

The topic seemed to quickly figured out what kind of additional differentials for the tiller were, but since the question arose, I decided to make a small photo report. After filming, the demo tiller with a differential was filled with gasoline and oil, so it was taken to the service room. It is cramped there, there are many other equipment around, so it did not work out to twist it. All I got from Caiman Vario was a photograph.

Differential for Caiman Vario Tiller

So, these are the differentials, or rather the semi-differentials installed together with the standard rubber wheels in size 4.00-8. (The set of two semi-differentials is called VARIO / Q Junuor / Q Max Tiller Differentials with Extension and has the code R0101.)

How is it done

The design of such differentials for tillers (and motor-cultivators, by the way, too) is extremely simple:

• the wheel hub is not fixed to the axle
• there are protrusions on the axle and hub (indicated by green arrows) that prevent the wheel from turning a full revolution

How it works

During normal tiller movement, the protrusion on the axle abuts against the protrusion on the hub and transfers the rotation to the wheel. In this case, both wheels will rotate at the same time.

But if you push the tiller forward, the differential hubs will act like overrunning clutches, and the lugs on the wheels “run away” from the lugs on the axle. They will not be able to run far. having made an almost full turn, the protrusion on the hub will burrow into the protrusion on the axle, but this is also enough to perform the maneuver.

After completing the turn, a tiller with a differential will be able to drive only on one wheel until the protrusion on the axle of the second wheel “catches up” with the protrusion on the hub. It is also possible to slip with one wheel until the “unlocked” one comes into working condition.

Why do you need tiller differentials

In simple terms, the tiller needs the differentials to turn at the end of the furrow. This is how the same Caiman Vario unfolds on grousers and without differentials.

To turn the tiller and return to the cultivated area, the lugs have to be dragged along the ground. And here it all depends on the weight of the tiller (or motor-cultivator) and the strength of the operator.

At the end there will be a video showing how differentials make this task easier.

Differentials on Tiller Pubert Quatro Junior

Above there was a picture with a differential hub that is different from that installed on the Caiman Vario. in the showroom there was another tiller with a similar design of differentials.

Differentials on Tiller Pubert Quatro Junior

Unlike previous domestic differentials suitable for several models, these are part of the native French “Plowing Kit” (code 8000010205) for the Quatro Junior and QJ V2 models (Caiman, Pubert and MasterYard, including models with a diesel engine), which includes includes:

• differentials
• wheels 5.00-10
• weighting agents
• reversible plow

Quatro Junior with such a kit has a wide track and a weight of over 100 kg. In order to deploy it with locked wheels, you need to be either very strong or very stubborn. In any case, such a turn at the end of each furrow will take a lot of time and effort.

Being with tillers, in about the same weight category, I decided to wrestle with him. To do this, I rolled it out to an open area in the showroom.

Testing Differential Capabilities on a Tiller

I filmed the testing. There were several samples, one of them got on the video. The video clearly shows how the wheels rotate during the turn.

The maximum turning angle is 270 degrees (3/4 turn), the minimum is 180 degrees (1/2 turn). In real work, it is best to rely on the minimum value. The 270 degree turn was possible due to the artificiality of the situation and the pushing of the tiller back and forth. Although, in real life, a reversal of 3/4 of a turn is possible.

Rubber wheels creak terribly on marble when turning, and when locked, they do not move at all. This can be seen in the video at the beginning and at the end of the spread. Attempts to move this centner with locked wheels did not lead to anything.

Yes, in a real situation, on grass, the wheels will slide better than on marble, but it will still be quite a specific entertainment.

P.S. In addition to the differentials, the plowing kit includes an interesting reversible plow from the Ribas company. I photographed it for a long time, I hope I will post it here soon with explanations.

Added on 2017-02-02 About the plow, my hands still do not reach to write, so a small video of a tiller with a differential and a reversible plow is:

Drawing of the overrunning ratchet clutch of Tiller wheels

The differential for the tiller is an irreplaceable component that allows you to reduce the physical stress on a person, which is experienced when a vehicle enters a turn. This device is also responsible for the even and proportional distribution of torque on the axle, which allows you to control such a vehicle when cultivating the soil.

If the native parts do not provide the required effect, then the owner of the equipment can independently make the device according to his requirements, and then install it on the tiller and operate the special equipment with great comfort.