Student design Bureau Carian Polytechnic Institute named after A. M. Gorky is known not only in redkach edges, but also far outside the Republic. The original snowmobile, transport on an air cushion, knapsack aredigital and other developments, which are not repeatedly described in “M-To” attract the attention of specialized organizations.
SKB has been around for almost a quarter of a century. Today is a great scientific and experimental unit of the Institute where research is being conducted on a number of topical issues, and most importantly, CSC provides a massive attraction of students to scientific-research and experimental-design works. Now there were seven groups, each developing “its” subjects.
Organized 4 years ago, CSC-7, specializing in the design, manufacture and test of sports dirt buggy, is the youngest student Association of the Institute. The first two machines with the brand of MPI was born in the spring of 1984 and immediately took a successful start: year Polytechnic V. Shcheglov, and V. Yershov took a number of prizes in the biggest competitions of the year. The victories won in many of the identified successful design of machinery — that was embedded in their scheme is still under design. To tell about the buggy MPI we asked the head of SKB-7 Vyacheslav SHCHEGLOVA.
Fig. 1. Frame Assembly (right wishbone suspension is conventionally not shown):
1, 2 — arc security
3, 4 — mounting brackets of the engine,
5 — protective frame of the power unit,
6 — eyelet limiter rear lever
7 — strengthen the linkage,
8 — arm rear suspension,
9 — removable bumper
10 — knuckle,
11 — lower front control arm,
12 — upper arm front suspension,
13 — absorber.
Common technical requirements and design experience of many collectives, logically had to lead to some “ideal” schema buggy. But hardly any among the arrivals at the start of cars, and today you will find two of the same. And no wonder: each team, if it is truly creative, something inherent in his own, special, and capabilities are different.
We hope that our experience will be useful primarily to young athletic teams. According to the existing classification buggy MPI belong to the 1st class and constructed out of available units and units included in the kit supplied DOSAAF. This power unit allows you to design the perfect motocross machine. The rear location provides a loading of the drive wheels, which is very important for a vehicle of this type. No boost engine, no reduction of the total weight of the structure is not appreciably alter the dynamics of dispersal, if not a firm grip of the drive wheels with the support. But overloading the rear axle impractical: will become worse handling and longitudinal stability due to the weakening grip of the front wheels with the road. Our cars weight distribution on the front and the rear axle was 40 and 60%. This ratio, according to our calculations, are close to optimal. In addition, the rear engine mounting has allowed more convenient to place the driver than the buggy with classical transmission. The seat is placed exactly along the longitudinal axis and in accordance with the selected weight distribution is shifted forward. In this situation, the driver controls the machine precisely, and on the turns with drift — moves to a smaller radius.
Fig. 3. The frame is in frame with the levers suspensions:
1 — lower control arm,
2 — spar, pipe 42X2,5,
3 — cross-beam,pipe 42X2,6,
4 — link rear suspension,
5 — bracket of the shock absorber,
6 — eyelet plugs
7 — motor bracket.
Frame is a welded tubular frame. In its manufacture was used the pipe from available structural steel: main frame, roll over bar and main load-bearing elements suspension beam — pipe size 42X2,5, side protection— 35X2,2, and on the other, less loaded elements (protection powertrain, bumpers, brackets of the wings) — size 32X2.