WALKING RECUMBENT

One of the main sources of environmental pollution is the vehicles. Therefore, constructors have a natural desire to create alternative, environmentally friendly means of transportation, which fully applies and recumbent. As the basis of its development, we adopted the design of the velomobile V. Mazurchak (“modelist-Konstruktor” No. 10 of 1987). But the technical capabilities are not allowed to repeat the machine one to one, we are particular to this and not sought. Besides, from the point of view of “strength scientists”, analog velomobile is, in our opinion, not very successful scheme of loading the important elements: the junction of the front and rear parts of the frame and the axis of the rear wheels, which can cause breakage of parts or assemblies during operation. But I wanted to make the car reliable (and therefore is durable) and thus to meet at least 20 kg of weight. The velomobile was to have such dimensions that enable it to pass under a standard door of the apartment and fit in a regular (not cargo) lift. Well, that was easy to transport and store, wanted to make it more collapsible.

In the car Mazurchak front wheel is a rear Bicycle, and both rear – front Cycling. On our own we decided to install all-wheel Bicycle with rear standard “torpedovtsam” bushings. The advantage of this step is obvious: the large diameter of the sleeve helps to significantly reduce the load on the spokes on the corners – after all, a significant side force of the front Bicycle wheel is not designed. The diameter of the sleeve allows the axis of larger diameter and use a standard rolling bearings 203.

 

The construction of the velomobile began with the manufacture of the rear beam axis. It is made of reinforced steel tap 3/4-inch pipe with outer diameter of 28 mm, inner: 20 mm.

Wheel bearings installed in the sleeve with a strip (spacer) made of galvanized sheet steel with a width of 4 mm. After final Assembly the axis of the gap between the bearing and the bushing (about 0.1 mm) filled epoxy with aluminum powder, to select the remaining gap. This method of fixing the bearing in the hub of the wheel proved to be quite successful.

 

Recumbent for walking:

 

1 – leading front swivel wheel (the rear wheel from the Bicycle “Desna”); 2 – plug carepackage host (rear fork of a Bicycle “AIST”); 3 – chain; 4 – connecting rod with the pedal (2 sets.); 5 – sprocket carrier (z=54, from bike AIST); 6 – holder carepackage node (pipe d22x2,5, 2); 7 – front fork (of Bicycle AIST); 8 – wheel; 9 – the front of the frame; 10 – docking station front and rear-luram; 11 – front wheel well; 12 — rear wheel (2); 13 — rear frame (tube d28x2,5, 2); 14 — the longitudinal base of the seat frame (tube 22×1,6, 2); 15 – bracket for tilt adjustment of the seat back (steel sheet s4, 2); 16 — seat cushion (foam); 17 – head restraint; 18 – adjusting the focus (tube 22×2,5,2); 19 – rear axle beam (pipe 3/4″); 20 – cross base seat (pipe d12x1,75, 8); 21 – wing rear wheel (2 PCs.); 22 – rear signal light (2 PCs)

 

Docking station front and rear semiframes:

 

1 – the clamp (steel, sheet s2); 2 console (steel, pipe d22x2,2); 3 – pen plugs-arc rear half-frames (steel, pipe d28x2,5); 4 – bolt M8 (4 PCs)

 

Then made two endings-axis of steel 20 that zapressovyvat with an interference fit in a machined on a lathe, the seats are steel I-beams. For greater reliability axis can be locked in the tube with M6 bolts as pins.

 

Then moved on to the production of “BB triangle”. It consists of turning the front wheel fork, fork holder and carriage. A turning fork is used from the front wheel of the Bicycle “AIST”. It’s only the rear and the fork carriage. The carriage of the pedal additionally contracted with the upper part of the plug holder. The holder is made of two parallel pipes with a diameter of 22 mm and a wall thickness of 2 mm. All of these parts are joined by welding, and together form a rigid triangle, able to withstand considerable loads generated by the pilot when pressure on the pedal. When designing “Dobby triangle” it was considered that the carriage of the pedal should be at a height of not less than 350 mm from the ground to the heel of the pilot did not touch the road when pedaling.

The front part of the frame (front of frame) together with the steering column is joined with the rear part of the frame (rear polurama) by means of the clamp, are made of 2 mm steel sheet. The clip angle welded to two pipes of an external diameter of 28 mm and a wall thickness of 2.5 mm – the rear part of the frame is expanding to the ends of the plug (or, if you want – arc). The pipe bend is provided by cutting out sectors with subsequent welding. Front frame side tubes are welded the two pipe external diameter 22 mm internal 18 mm – they serve as supports for the wing mounting brackets and seat frame.

 

The node of the rear wheels:

 

1 – beam; 2 – axle; 3 – castellated nut M16; 4 – bushing wheels (Bicycle, modified); 5 – bearing 80203 (2); 6 – spacer (galvanized sheet, 2pcs); 7 – pin

 

Rear axle beam with the axis of the wheels:

 

1 – beam (steel pipe 3/4″); 2 – axis rear wheels (steel, circle 24, 2 PCs.)

 

The rear beam is attached to the tubes of the rear articulated by a pair of step ladders M10.

 

The seat frame consists of two curved longitudinal members and cross members. The first is made of pipes with a diameter of 22 mm with a wall thickness of 1.6 mm and a length of 800 mm, which is drilled non-through holes with a diameter of 11.5 mm for eight crossbars. The crossmember went pipe outer diameter 12 mm, inner 8.5 mm and a length of 380 mm. Pipe longitudinal members are bent in the wire templates previously made in accordance with the drawings. This is followed by Assembly of the frame – 12-mm tube is clogged in the holes of the side elements of the seat tension, then the connecting nodes scald. After the seat frame was ready to lower the crossmember welded in place the brackets the seat mounts to the frame and to the frame return. To the longitudinal elements, and pipes the rear of the frame welded to the brackets adjust the angle of the seat frame.

Then the seat frame is mounted a soft sponge rubber wire from the back of a bus seat, say “Keyway”, or foam rubber of suitable thickness. The pillow is worn leatherette cover from the same seat. Support for the headrest are welded separately. Personally I prefer the solid design of the seat, offered by W. Maturecom, but it all depends on what the manufacturer has available.

 

Recumbent with a front leading and the driven wheel and driven design V. Mazurchak

 

Recumbent – an ideal vehicle for exploring side paths and alleys

 

The brackets of the wings are fixed in place.

 

During the operation of the velomobile decided an interesting feature-while pedaling leg is almost on the same line as the hip and shoulder, allowing you to develop a much greater effort than normal the bike fit.

 

Our recumbent – an ideal vehicle for exploring the paths of the Park, sanatoriums, rest homes. It can be operated even by people who, for one reason or another is inaccessible to the ordinary bike.

 

Main technical characteristics of the velomobile

Type – road, walking

The number of places is one

Drive – pedal, chain drive on the front wheel

Number of teeth: leading – trailing 54 – 18

Brake – foot operated, on the front driving wheel

Tire dimensions mm: front – 622×40 front – 406×40

Seat – polulezhachee, like chaise

Base, mm – 825 Track, mm – 635

Overall dimensions, mm – 1695x755x950

Weight, kg – 20

 

P. SPEAR, the city of Beloretsk