During design development we present motoblock tried to solve three tasks. First, maximum use of to manufacture standing for several years without case motorcycle “Minsk”. Secondly, to be able to make at home, with minimal turning and without using expensive parts. Finally, third, we wanted to make a walk-behind tractor, which would be a good mechanical helper in the household with a plot of land: that it was earth to plow, potatoes and other root vegetables to plant, inter-row cultivation of plants run, and the harvest be removed and relocated.
The tillers turned out pretty good, it met expectations and tested to work in severe conditions.
Began production of walk-behind tractor with alterations of the base frame of the motorcycle “Minsk”. From the frame sawed off unnecessary in the future and hindering the work of the various brackets, footrests passenger, and a left footrest for the driver. Right footrest of the driver cut at a distance of approximately 180 mm from the axis of the under engine pipe (the plane of symmetry of the frame). The remainder were used as the bracket of the muffler. And here is the seat bracket off only after it has been welded to the frame steering levers with their connecting cross-bar, curved as one piece of half-inch pipe.
With great responsibility reacted to the manufacture of the bearing sleeve of the drive shaft of the wheel, its mounting and securing on the frame of the cultivator. It would be better to make the bushing one-piece on a lathe from 300-mm cut steel thick-walled pipe or round steel with a diameter of 60 mm. We, in the absence of such blanks, have used a welded construction made from matched to each other, cuts steel seamless pipes of appropriate sizes and lengths (by the way, the same technology is made and sleeve of the intermediate shaft). While sections of tube with large diameter to form a socket under 80205 deep groove ball bearings with two shields (you can use bearings 60205 — factory with one protective spacer from dust-dirt (only need to install it necessarily outside).
For the bearing sleeve has prepared a place — a small curved cutout under the bottom tube of the frame at the junction of the racks. The sleeve is mounted perpendicularly to the Diametric plane of the frame so that its middle lying in this plane, and only “taking” and adjusted, welded this important site to the frame permanently.
The tillers from the old bike (the units and components POS.6,8,9,10,13—a motorcycle “Minsk”):
1 — wheel with grousers (farm equipment, 2 PCs.);
2 — Parking time;
3 — exhaust pipe with silencer;
4 — power unit (from a motorcycle “Minsk”);
5 — cylinder head cover with forced air cooling;
6 —frame tillers (modified);
7 — column;
8 — gas tank;
9 — kick-starter;
10 — storage box tools and accessories;
11 —lever controls;
12 — crossbar levers;
13 — lever-gear shift grip;
14 — rocking chair;
15 — pull shifter;
16 — U-shape suspension fixing frame mounted implements;
17 — cross member for the mounting of the guns;
18 — frame attachments;
20 — plow.
In the back of the “Minsk” of the frame are brackets with holes 8 mm diameter for attachment of the mud flap (wing). These several brackets are bent inside of them straightened, made parallel to the longitudinal plane of the frame of the cultivator. Then the reinforced brackets welded to the pipes and steel strips with a cross-section 20×5 mm. Holes in the brackets drilled to a diameter of 10.2 mm.
After amplification, the ends of the brackets and arcs upper seat frame welded control levers carried out with the crossmember (bent and welded in the bends) of half-inch steel pipe. Tried to weld symmetrically relative to the plane of symmetry of the frame, and the ends of the levers lit, so they were at a distance of about 780 mm from each other. After that, the levers were inserted and welded to the corresponding spacer.
1 — motor mount (from a motorcycle “Minsk”);
2 — bushing drive shaft of the wheels (steel, circle 60);
3 console (steel, strip 60x7x210);
4 — cheek (steel, sheet s5, 2 PCs.);
5 connection (steel pipe 1/2″);
6 — t-stand (weldment of two strips with section 60×7);
7 — pivot bracket-lug (steel, strip 60x60x7);
8 — strut strut;
9 — seat arc;
10 — bracket-stiffener (steel, strip-section 20×5,2);
11 — bellcrank steering with tie bar (steel pipe 1/2″);
12—strut steering arms (steel pipe 1/2″);
13 — insert (steel pipe 1/2″);
14 — suspension brackets intermediate shaft and mechanisms chain tension (pipe 1/2″)
The l-shaped lever-handle manual gear shift is bent from a steel 10 mm rod. Wearing her short (length 12 mm) remote arm bushing is inserted from the right side (if you focus on a course of movement of the motor-block) into the holes of the brackets with the welded strips. And the left side on its end fits over another of the same remote, the hub and welded to the chair with a hole diameter of 8.2 mm for thrust. Pull (wire diameter 8 mm) connects the rocking lever and the gear shift mounted on the shaft of the transaxle.
For connection to the tillers of the trolley frame is welded by node coupling. It is made from strips of steel strip with section 60×7 mm and consists of a horizontal console and stand, reinforced stiffener. The rear end of the console in favour of the rack for 60 mm, and to the rack at a height of 122 mm is welded to a lug corresponding to lug the console. In both parts are drilled coaxial holes with a diameter of 22 mm. Between them is inserted the bushing drawbar truck (120-mm section of steel pipe with inside diameter 22 mm) and the node is coupled by drawbars.
Intermediate shaft Assembly with the sprockets:
1 — sprocket z=42 (from a motorcycle “Minsk”);
2 — hub (FT4);
3 — mount the sprocket to the hub (M5 screw, 6 PCs);
4 — the bearing housing (FT4, 2);
5 — deep groove ball bearing 80204 with protective washers (2 PCs.);
6 — short spacer (steel tube 3/4″);
7 —long spacer (steel tube 3/4″);
8 — piece intermediate shaft (weldment, pipe 34×28);
9 — key 5x5x20 (STB);
10 — sprocket z=8, was designed together with the hub (Steel 45);
11 —washer (ft3);
12 — spring split washer;
13 —mount sprocket (nut M14);
14 — intermediate shaft (Ст6);
15 — mounting bracket the intermediate shaft to the frame (steel sheet s6, 2 PCs.);
16 — brackets chain tension (steel sheet s5, 2 PCs.)
Powertrain and drivetrain the bike was designed for speed up to 85 km/h (up to 5500 rpm) that for a “garden” of the machine was completely useless. So the transmission had to introduce intermediate shaft with two lower chain gear in order to reduce the number of revolutions of 13.5% and significantly increasing “tegometall” motoblock. The right rear strut to the front of the frame (if you focus on a course of movement of the tillers), departing from the axis of the sleeve of the drive shaft 105 mm, is welded to the first tube bracket perpendicular to the plane of the frame, and stepping back 185 mm — another of the same tubular bracket (mounting) of the intermediate shaft.