The disadvantage of this method of “blocking” — the inability to use the front axle in reverse (we have a front main transmission reverse gear removed), but the advantage still more.
An important part of these machines — wheels and tires, because they provide them an increased permeability. The lack of suitable wheels industrial production makes Amateur designers find their way.
Our wheels is aluminum cans with a diameter of 450 mm. I Must say that they are made from a fairly thick sheet (2 mm). Now on sale more often a thin (1 mm), they are only suitable for use for its intended purpose. The discs among themselves and with internal plan goals of duralumin sheet thickness of 5 mm are bonded with five M8 screws, hubs FDD they pulled four extra long nuts.
A modified differential gear of the front axle:
1 — satellites with three left (out of ten) teeth and deposits (shaded); 2 — thumb; 3 — gear rod; 4 — spring; 5 — M5 screw mounting of the spring.
Intermediate shaft chain gear:
1 — asterisk is large (z= 21); 2,5 — small sprocket (z = 11); 3 — intermediate shaft (pipe 32×2,5); 4 — spacer (pipe 27х 1,5); 6 — the needle bearing in the yoke (2); 7 — thrust washer (bronze, 2 pieces); 8 — cheek (2); 9 — axle; 10 — oiler.
1 — bushing sprocket; 2 — star (z = 21); 3 — cover screw (М50х 1,5); 4 — bearings 204; 5 — nut shaped M20; 6 — shaft-gear; 7 — gear, full-time; 8 — an arm of fastening of a reducer; 9 — driven shaft; 10 — rivet (steel, Ø5); 11 — housing; 12 — head.
The strength of such discs is sufficient for the operation of the vehicle under normal conditions. However, careless driving on stumps, high hummocks and fallen trees, while overcoming the deep ditches with overclocking and so on such discs sometimes crushed, usually from the outside. So we strengthened them foam liners with a thickness of 100 mm. Ear firmly pressed to the external drives the plan-washers of 3 mm thickness and nuts screwed onto studs that are inserted into the elongated wheel nuts. In addition, foam increases buoyancy and stability of the vehicle on water.
Tires low pressure — double chamber size 900×300 mm, end-of the resource in the wheels of the aircraft. External camera cut to the interior diameter and attached to the disk M8 screws with spherical heads. For better traction, and size limits on external camera glued perforated conveyor belt.
Wide track and short wheel base of the vehicle, low pressure at wide thick tires (0,2*105 PA) can do even without the suspension, which greatly simplifies and facilitates the design of the machine. The only disadvantage associated with the lack of suspension and we discovered in the process of operation, longitudinal swinging (resonance) of the loaded vehicle at a speed of approximately 20 km/h. From this we removed, providing the trunk shock absorbers scooter.
For several years the vehicle was operated without the propeller moving through the water due to the rotation of the wheels. However, the speed of this motion was very small, especially with a headwind and waves. Not helped by the blades mounted on the lateral surface of the wheels. Currently, the vehicle has a propeller from the outboard motor “Whirlwind-20”, which is the drive chain from the shaft of the fan motor using a modified gear from the same “Vortex”. Revision of zakljucili in the manufacture of the new case and mounting bracket, the elongation of the driven shaft, install the shaft-gear bushing with an asterisk.
The new housing is welded from pieces of steel pipes of suitable diameters, treated with a size standard gear components. Special care required welding of the housing parts to each other and to the mounting bracket, to avoid warping.
Driven shaft lengthened by 250 mm with the nozzle, made in the regular dimensions of the shaft and connected to it by two steel rivets. The elongation required installation of additional support — ball bearing 204 fixed to the housing by a threaded cap with lip seal.
Torque from the engine shaft of the reducer is passed through the grommet with a square hole, made according to the size of standard gear shaft. The connection of the sprocket with the bushing welded. On the sleeve with the nut fixed ball bearing 204. Regulation of the gaps in gears and mount the drive shaft in the housing are the same screw-on cap with lip seal (for mounting in the sprocket holes).
The driver controls the gear from his seat with a lever having a fixed position “forward”, “neutral” and “back” cable wire key (not shown). Speed on water 5 km/HR, which is sufficient to overcome water obstacles even during resenih spills. When the land screw and chain drive can easily be removed.
Due to the installation of the reducer of the screw using the standard muffler motorized FDD has become difficult. Had to make a silencer out of pipe segments of different diameters. Case of pipes of 80 mm diameter with the ends sealed, the inlet and outlet pipes inside have 12 holes 8 mm in diameter. the Reduction in engine power is not seen, the noise level compared with the initial increased slightly.
V. MULTANOVSKIY, SEMENOVYKH, Kirov