Introduction

The term paper on the subject “ Machines Elements” is one of the basic kinds of the students individual work. The purpose of the term paper is to enhance the knowledge acquired by the student at the lectures, practical classes and laboratory sessions as well as to develop the skills of making research and design of present-day speed reducers.

The term paper is to include the following parts:

1. Determination of speed reducer elements geometrical parameters and carrying out their strength analysis.

2. Designing a speed reducer.

3. Designing a mechanical drive

All calculations are to be presented at the explanatory note that should be carried out according to requirements of State Standard «ДСТУ 3008-95. Державний стандарт України. Документація. Звіти в сфері науки і техніки. Структура і правила оформлення». The explanatory note should be either typed or hand written in blue or black ink on one side of size A4 paper. Every sheet is to be paginated and have the following margins: top – 5 mm, bottom – 5 mm, right – 5 mm, and left – 20 mm.

Besides calculations the explanatory note should have the contents table, the assignment, the reference literature used for making the term paper, specifications. Each new part should be begun with a new page.

Each part must be subdivided into items marked with numerals separated by a point. The first numeral represents the number of the part, the second one shows the number of the item.

All magnitudes that are part of formulas should be explained. Besides, it is necessary to denote measurement units of parameters being calculated.

The graphical part consists of 4 drawings: 1^st drawing is a speed reducer (two projections); 2^nddrawing is a mechanical drive (two projections); 3^rd drawing is shop drawing of a speed reducer shaft; 4^th drawing is shop drawing of a speed reducer gear. The 1^st and the 2^nd drawings are made on A1 whatman paper; the 3^rd and the 4^th drawings are made on A3 whatman paper. The title block should be drawn in the bottom right hand corner.

1. KINEMATIC AND FORCE ANALYSIS OF
A MECHANICAL DRIVE

Let us determine the basic parameters of the mechanical drive (fig. 1.1) if pull of the belt F_t =3 kN; belt speed V =1.4 m/sec; drum diameter D =350 mm.