A SMALL RECUMBENT FOR LARGE ROADS

Mini-recumbent, about which speech will go, was born in the Kazan Studio of Edward Stovbunenko — designer of velomobiles and a lover of travel to them. Edward party festivals, parades velomobiles “Golden ring” organized by Moscow club of enthusiasts biotransport (CAB) twenty years ago. Since then, he’s on different models with a muscular drive of his own, passed under the Russian and foreign roads the way, almost equal to the equator of the Earth.

This is the “younger” recumbent he developed in collaboration with the graduate of the Kazan aviation Institute (KAI) by Denis Silantiev. Together they have produced two prototypes and… brings them right behind in Tushino festival “Selectica-2006” after “Dandy” (or “DAN&Edie” — from the initial letters of the names of the authors), weighing only 19 kg, easily folds up to the size of 420x470x850 mm and is transported as a backpack.

Two months later, in September, Edward once again brought an already modified “Dandy” and took part in the jubilee test tour of velomobiles. Miniature pedal car ran 820 miles on the Golden ring of Russia on an equal footing with adults. And the speed 25 — 30 km/h on the road for her was not the limit.

In addition to the amazing compactness, the velomobile is another “highlight” — the original suspension rear support wheels. As the elastic elements it uses rubber rings, cut from an old car cameras. A number of them you can adjust the “softness” of the suspension.

I had the opportunity to pass on “Dandy” in the run a good two hundred kilometers and a great deal of pleasure from travelling on this minimalmouse!

For the test tour of the Moscow club of enthusiasts biotransport “Golden ring -2007” was ready a small series of pedal cars, dubbed the “Dandy-tourist”. Now each of these mini-velomobiles could carry a small (20 kg) load: tent, camping equipment and food.

Of course, “Dandy” is mainly intended for roads with a good coating of wheel of small diameter dictate their own terms. For the weekend trips in this mini-velomobile can travel tens of kilometers along the forest paths. He can always be with you: car, bus, train.

Mini recumbent” “Dandn-turns”:

1 — front unit (top view on the wing but is conventionally shown); 2 — rear unit; 3 — seat

Front Assembly:

1 — rod (2 PCs); 2 — shield block leading asterisks; 3 — unit leading sprocket (z = 28, z2 = 38, z3=48); 4 — circuit of the first stage (t=12,7); 5 — transmission; 6 — chain case (plastic tubes); 7 — chain damper; 8 — wing (plastic); 9 — front leading driven wheel (reinforced 16 sintomi, Ø305); 10 — the cable brake; 11 — the lever of a manual brake, 12 — wheel (Bicycle); 13 — the lever of switching of transfers; 14 — a shift cable; 15 — intermediate shaft with sprocket z=18 and z=30; 16 — chain tensioner; 17 — bracket chain tensioner (steel, sheet s2 with flange); 18 — circuit of the second stage; 19 — hub wheel drive (driven) sprocket z=19; 20 — tick brake; 21 — front wing

Front of frame:

1 — bushing carrier (pipe Ø43×3); 2 — bearing 60104 (2); 3 — removal of the carriage (pipe Ø5Ох25х1,5); 4 — arc (pipe Ø20х1,5, 2); 5 — support (tube 50х25х1:5); 6 — glass hinge Assembly; 7 — terminal (bike); 8 — cradle installation and handlebar mounts (steel sheet s2); 9 — wheel (bike); 10 — tulka intermediate shaft (tube Ø20×1,5); 11 — cheek (steel, s3, 2 pieces); 12 — bracket mount switch gear (steel, sheet s3); 13 — guide chain (steel, sheet s2); 14 — front wheel (“furnished”)

The construction of the “Dandy” — tricycle scheme with “broken” frame. Front wheel leading, the back — reference. “Breaking” the frame is two articulated articulated: front and rear. Its fracture is management of the recumbent frame Material — steel thin-walled (1.5 mm) pipe: rectangular cross section of 50×25 mm and round diameter 22 to 30 mm. All the elements of the half-frames are connected by welding.

Recumbent consists of two main components: a front articulated with the wheel, the actuator and the drive wheel; the rear half frames with supporting wheels and their suspension and seat, the Seat should be described in a separate node as it is removable and foldable.

Front of frame — swivel, combined with the drive of the recumbent and driving. It consists of two arcs, removal and support. One of the arcs welded bracket-bushing to the axis of the intermediate shaft (spacers) with asterisks and the stabilizer and the leading chain.

To the front end of the removal of the welded housing of the carriage in which two radial bearings 104 series dad mounted a carriage with a standard crankset (removal) welded bracket for the shifter and is attached to support a mud flap to the leading ear. The wheel itself is mounted in two cheeks welded to the bottom of the arcs.

To the rear Highlander front articulated welded the terminal to the cradle, locking the wheel. On the right handlebar mounted lever shifter on the left and tick handle brake, compressing under the action of the rim of the front wheel.

Drive “Dandy” chain, two-stage chain pitch is 12.7 mm. All wheels with a diameter of 12 inches (305 mm) collected on a conventional bushing type “torpedo”, which removed the brake drums. Only the front wheel is reinforced with additional 16 spokes. On the right crank with the arm 170 mm there are three leading asterisks with the number of teeth 28, 38 and 48. They do provide a change in the transmission ratio. The gear — from Kharkiv Bicycle factory. Only it is divided into two parts: the tensioner remained in close proximity to the drive wheel for the purpose of the first stage and mounted on the bracket, and the switch is fixed on the stem near the carriage.

Intermediate shaft with a pair of sprockets and a chain tensioner:

1 . frame; 2 — bushing; 3 — bolt; 4 — panel; 5 — clamping bushing internal bearing race; 6 — small star; 7 — spacer-shaft; 8 — a large asterisk; 9 — coin; 10 — nut; 11 — flange; 12 — cheek (2); 13 — sprocket tensioner; 14 — bushing tensioner; 15 — spring; 16 — the eccentric shaft; 17 — screw; 18 — bracket chain tensioner

Rear of frame:

1 — ridge (steel pipe rectangular size 50x25x1,5): 2 — front speakers (Cycling); 3 — axis pendulums subscription (pipe Ø27×3); 4 — bushing of an elastic element (pipe Ø30х1, 2 pieces); 5 — holder of elastic elements (pipe Ø22×2): 6 — bushing (steel pipe 30); 7 — nut M20

Rear of frame with wheel suspension:

1 — range; 2 — strut hinge Assembly; 3 — the pendulum; 4 — elastic element

Pendulum:

1 — casing (steel pipe 50x25x1,5, 2); 2 — glass installation of a pendulum axle (Bicycle); 3 — sleeve for mounting the pendulum rod rear wheel; 4 — nut M8 for fixing screw rod; 5 — retainer rod (screw M8); 6 — finger linkage of the elastic element (pipe 18×1,5, 2 PCs); 7 — cover plate (steel, sheet s2, 2 PC.)

The rear wheel with the rod and the wing:

1 — wing; 2 — rear wheel; 3 — bushing the rear wheels; 4 — bracket mounting wing; 5 — axis: 6 —rod; 7 — wing; 8 — a collar of fastening of a wing

Increase the speed, two stars (z = 18 and 30) are mounted on the intermediate shaft in the form of spacers, which, through the angular contact ball bearing 136104 planted on a tubular shaft. The inner race of the bearing clamped by the washer and nut bolt bracket chain tensioner and outer — by the asterisks. The working chain is passed through the stabilizer and through the protective piece of plastic pipe fixed in it.

The connection node of the front and rear half-frames similar to the steering column of a front fork of a conventional Bicycle, and consists of the same parts. Differs only in shorter glass (welded to support the front half frames) and resistant (screwed into welded secretly M20 ridge rear half frames).

The Foundation of the rear half frames — tubular ridge. It is made of ruby rectangular sizes 50х25х 1.5 mm and consists of three parts: the front sloping, the average main and rear auxiliary. Between the last two parts welded axle pendulums pendants. The front ridge is covered with a cap, and a rear end welded to the tubular holder elastic elements.

On the ridge in two independent pendular suspension with elastic elements mounted rod support wheels.

In the case of each pendulum, made of the same pipe as the backbone for its mounting on the frame has a glass and sprinkling of the rod supporting the wheel in a hollow and another finger to interact with a resilient member.

The node of the suspension of the pendulum on the frame is the same as a node of articulation of the two half-frames. For fixing the inner ball of the cone on the axis of the pendulum is worn with a gap spacer. On the same bushing and the holder of the tensioned elastic element in the form of a set of rubber rings with a width of 40 mm, cut from an old car cameras. Finger of the pendulum is put under the lower branch and the bottom one obkladyvaetsja outer ring to limit the free travel of the suspension.

Rod is a pipe with a diameter of 26 mm and a length of 204 mm, which has a wheel axle with welded to it a bearing holder on the rear wing. The axle is pressed into the tubular rod and is additionally fixed by screw. Bush wheel mounted on the axis through the inner bearing No. 60203 (40x17x12 mm) and the glass on the outer bearing No. 60101 (28x12x8 mm).

End of the rod wheel is inserted in the hub of the pendulum and is fixed in this locking screw which is screwed into is welded to the nut casing and inserted simultaneously into the holes in the sleeve and the rod.

The seat is the most simple and at the same time is also quite original part of the recumbent. The arc of his back, the emphasis and the limiter stops form a triangle supported by the frame. One of the sides of this triangle (limiter focusing) always works only in tension, the designers have built it from lightweight, durable synthetic tape. This solution allows you to fold seat one hand!

The seat base is made of two pieces of 2-mm dural strips, bonded linings with rivets. It is mounted on the ridge of the rear articulated by curly braces and has the ability to move. Through holes with a diameter of 16 mm in the cheeks brackets omitted the axis connected to the seat base by two clamps. On the same axis are two pairs of spacer sleeves.

The node of the rear wheels :

1 — state (dural tube Ø26×5, L=204), 2 — axis (steel, circle 20); 3 — bracket; 4 — wing; 5 — bearing 60203; 6 —Bush of a wheel with spokes; 7 — bearing 60101; 8 — Cup (aluminium, circle 40); 9 — mount pressure washer; 10 — a stopper(rubber); 11 — pressure washer inner ring of the bearing (steel, s); 12 — lock axis (screw M5 flat head screws)

Swivel-rotary (connecting) node semiframes

Swivel-swivel (connecting) node half-frames:

1 — front of frame; 2 — rear frame (ridge); 3 — strut hinge (front rear articulated); 4 — cone; 5 — balls (2 clips); 6 — cone bushings (2pcs); 7 — sleeve; 8 — nut-cone

Parts kit seat:

1 — arc of the backrest (dural tube Ø19×1,5); 2 — blank back (dural tube Ø19х1,5); 3 — rod (dural tube Ø22х 1,5); 4 — network; 5 — sticky tape; 6 — fastening of the arc rods and to the axis (M4 screw notched washer); 7 — bracket (2 pieces, steel, sheet s2); 8 — axis (tube Ø18×1); 9 — the base of the seat (made of anodized aluminum, the sheet s1,5); 10 — the short spacer (pipe Ø22х 1,5,2). the 11 — seat (foam); 12 — long spacer (tube Ø 22×1,5, 2); 13 — clip (steel, sheet s3); 14 — spacer (aluminum, sheet s4): 15 — stop stop; 16 — backrest (foam)

Behind torita recumbent folded

The attachment of the seat to the frame

At the ends of the axle with the bolts and curved washers fixed rods, inside which the ends of the arc of the seat back. The arc tight network of cross-linked synthetic belts. Axis of the backrest to the “twist” is sewn, and the seat base glued “Velcro” for mounting pads. The pillows themselves are made of sheet foam (for base) and “skin” – Mat for tourists (for the back). Both are Packed in cases made of artificial leather, which is also sewn tape”Velcro”. Their grip is enough to hold the pillows in a comfortable position

The seat is adjustable. It can be moved along the frame enough to loosen the locking screw, and with it the plate blank. Height of the backrest is changed too: the arc is fixed to the rods with screws in several positions. And the backrest is set by changing the length of the limiter stops.

The velomobile “Dandy” is very simple, good color combination: a rear part of the frame, including the suspension components, painted with powder enamel in black, and the drive and parts seats — silver “metallic”. The little bar — all open ends of the tubes of the frame and the drive inserted plastic decorative plugs.

For folding velomobile “Dandy” is sufficient to weaken the retaining bolts to the rods supporting the ear, to release from the outer rubber rings pendants pendulums fingers and drown rod pendulums. After this it is necessary to rotate the rear part of the frame 180 degrees and the velomobile can be removed in the backpack!

The new “Test rounds” of Amateur designers want to improve the patency of the “Dandy” through the use of increased wheel. That will only be possible to maintain in this case the unique compactness of the velomobile?

V. UL

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