Tricycle “Grasshopper” designed and built in the laboratory design of compact machines CUT Novosibirsk Akademgorodok seventh graders Anatoly Mikhailov, Victor Krivonos and Sergey Jahtari.
It is a lightweight, FWD car with the engine Ш52 and torsion bar rear suspension. The wider track of the rear wheels in combination with independent wheel suspension, sprung front wheel drive, brakes on both rear wheels provide a comfortable and safe ride on the tricycle, which is especially important in the first stage of learning to drive.
Front fork taken from scooter “T-200”. Head frame made from tubes Ø 38 mm, the ends of which are welded cups for a thrust bearing with a suitable inside diameter. Unnecessary upper part of the pipe plugs cut off. For fastening the steering is also used parts scooter “T-200”.
Fit the steering wheel from any bike with a device for switching speeds of the engine Ш52. You can use a motorcycle (or motoroleriu) steering wheel, setting his left arm lever to shift gears.
TRICYCLE “GRASSHOPPER” — a popular exhibit Central NTTM exhibition at ENEA USSR — designed by young technicians CUT Novosibirsk Akademgorodok.
On the front fork-mounted engine Ш52 from a moped “Riga” power of 2,2 HP to the Bracket made of pipe Ø 22 mm in the form of an arc of the envelope of the engine from the bottom, has lugs, where the insert lugs of the crankcase and cylinder heads, which are then fastened with bolts. Cylinder head for this rotated 180°. The rear end of the bracket is pivotally attached to the steering column of the front fork and the front end of two split thrust rests on the wheel axle.
Curved bracket for engine mounting, vertical plug, and pull the lower swinging arm front fork to form a hinge chetyrehdverny. Thanks when traveling the engine varies with the wheel and the chain tension remains the same. To adjust the vertical split thrust have nuts with right-and left-hand thread. In a nut wrap coupling bolts M16, the rotation of which the tension of the chain. For the prevention of samootverzhennyj bolts have lock nuts.
These pictures show a second embodiment of the tricycle.
All the controls of the tricycle are mounted on the steering wheel: right — throttle, brake lever, ignition switch and horn button; on the left the shift lever in combination with the clutch lever and the lever of a decompressor. The wheel has a rotation limiter in the form of three stops, two of which are welded to the bottom Cup of headtube, and the average focusing is welded to the plug.
The engine is subjected to the following alterations: in the right crankcase cover propylene hole to pass the chain down; the starter pedal located on the right. She remade the type of motorcycle, as microvesicle “Agidel” (see “modelist-Konstruktor” No. 5, 1971, p. 27). Muffler — shortened, taken from the D5 engine; exhaust pipe shortened to the minimum and the exhaust gases is carried out at 90° to the side. This compact muffler is well dampens exhaust noise and the engine develops normal power.
1 — head pipe; 2 — the focus limiter steering; 3 — pipe of the rear axle.
Front fork with bracket motor and suspension:
1 — mounting parts steering wheel (scooter “T-200”); 2 — pipe for mounting the gas tank and the ignition coil; 3 — the plug (of the scooter “T-200”); 4 — bracket motor; 5 — split thrust bracket engine; 6 — threaded bushing for tension exalt; 7 — step.
Front axle (PT. 45).
To the steering column horizontally welded tube Ø 27 mm, which strengthened the fuel tank of a motorbike and ignition coil.
Rear axle consists of two pipes welded to the middle liner having a hole for five plates, elastic torsion bar front axle motorized С3А, working in torsion. The ends of the plates wearing swinging levers.
We used scrap metal levers of the front axle “Zaporozhets”. Suitable levers of the front axle of the sidecar С3А or levers, made of parts, welded U-shape.
On the ends of the arms welded to the axles and supporting wheels for brakes. Pads can be rented from a motorcycle “Rising” or “Java-50”. The brakes on both rear wheels are actuated by a lever located on the steering wheel, via the cables in flexible casings.
Rear axle and front fork of the tricycle are connected by an inclined pipe Ø 42 mm. the welding reinforced U-shaped kerchiefs. On the rear axle vertically welded pipe, which carries the seat of a moped “Riga”.
Control cables and wires should be possible to skip inside the tubes, which gives the car elegance.
Chassis parts (top to bottom):
bushing front wheel; a support disc brakes; rear hub wheel brake drum; rear axle with torsion bar suspension.
Wheel Ø 280 mm (3,5×5), which used the event. Wheels made by pressure on a lathe. For this operation it is necessary to carve dural or steel punch in the shape of the future drive. Production technology is as follows:
the tool set and cartridge to it through the lining pressed against the tailstock of the workpiece drive and 700 rpm spindle gradually compress it with a roller on the punch. After installation on the lathe, the workpiece should be cut and machined in diameter. The diameter depends on the shape of the punch. The sprocket drive wheel has 36 teeth.
During the test, the tricycle has shown good performance. It is easy to drive, stable in turns, because of the independent torsion bar suspension rear axle allows the driver to run them with the internal roll. The presence of front-wheel drive eliminates any drifts, inevitable with rear wheel drive. The simplicity and originality of design, reliability and low cost allow us to recommend the tricycle “Grasshopper” for manufacturing in the circles of technical creativity for children.
Overall length — 1230 mm
Height (max) — 860 mm
Rear track wheels — 900 mm
Dry weight: 32 kg
Speed — 40 km/h