# Personal code of the student, Tasks for course design, Volume...

## Student's personal code

The student must accept the initial data for performing the examinations in accordance with his personal cipher consisting of five digits.

The first three digits of the cipher correspond to the initial letters of the surname, name, patronymic of the student.

Their correspondences are given in Table. 1.2.

Table 1.2

The fourth and fifth digits of the cipher correspond to the last two digits in the student's record book.

For example: Maxim Georgiev.

Number of the record book: 561209.

The cipher in this case is: 14109.

The initial data for the execution of the course project should be taken in accordance with its personal cipher (Section 1.6) in the following order:

1. The last digit of the cipher is used to select the drive circuit (pages 10-11).

2. The first digit of the cipher is from Table. 1.3 selects the nominal power transmitted by the drive.

3. The second digit on the left of the cipher from Table. 1.3 the reversibility of the drive is selected.

4. The third digit on the left of the cipher from Table. 1.3 selects the output frequency of your drive.

5. The fourth digit on the left of the cipher from Table. 1.3 selects the service life of the drive.

Table 1.3

 The number of the cipher 1 2 3 4 5 6 7 8 9 0 Speed ​​of the output shaft of the drive, rpm For drive circuits N9 0, N9 1, N9 2, L? 6, No. 7, L? 8, N9 9 180 100 190 120 160 170 130 140 Software 150 For drive circuits N9 3, L? 4, N9 5 27 15 19 35 23 31 47 51 39 43 Output shaft power, kW 2.2 2.4 1.6 2.8 3.4 2.0 2.6 3.0 3.2 1.8 Drive life, thousand hours 12 14 16 18 20 26 29 32 20 23 Reversibility (P - reversible; H - non-reversible) P N P N P N P N P N

For example, a student with a personal cipher 91407 should perform a test on the following initial data:

1. Drive scheme -№7.

2. The drive is reversible.

3. The rotational speed of the drive output shaft is -120 rpm.

4. The service life of the drive is 23,000 h.

5. The nominal power transmitted by the drive is 3.2 kW.

Scheme # 0

Cylindrical-cylindrical drive

Scheme # 1

Cylindrical-chain drive

Scheme # 2

Belt-cylindrical drive

Scheme # 3

Worm-chain drive

Scheme # 4

Worm-Cylinder Drive

Scheme # 5

Belt-worm drive

Scheme # 6

Belt-cylindrical drive

Scheme # 7

Cylindrical-cylindrical drive

Scheme # 8

Conical-cylindrical drive

Scheme # 9

Conical-chain drive

## Calculation and preliminary design

Calculation and a draft design (paragraphs 3-20 of Table 1.4) should be performed for the entire drive consisting of:

• from an asynchronous motor;

• Couplings;

• single-stage gearbox;

• open transfer.

The general view of the drive in the "Sketch project" stage should be implemented. with the maximum simplifications (according to GOST 2.119-73 and other ESKD standards).

At this design stage, a scheme is developed for dividing the product into its component parts (according to GOST 2.711-82).

The component parts of the product are simplified, if the constructive device, the interaction of components and the working principle of the product are understood.

The draft design of the drive must be made with a pencil on paper with a millimeter grid or on drawing paper.

It is possible to make drawings on a personal computer (with the use of programs АШоСАО, ​​КОМРАЯ) with printout of results on the printer or on the plotter.

When executing a draft drive project, the student must learn to solve the following design tasks:

• selection and development of the design of the main parts, taking into account the maximum provision of their manufacturability;

• Selection of joint types of parts, ways of fixing parts on shafts

• the choice of ways to fix the shafts in the supports;

• Provide for the possibility of assembling and disassembling components, adjusting the gaps in the gears and gears, and

• Provision for belt tension (in belt drive) and chain (in chain transmission)

• choice of gear lubrication system and bearings

• Selecting the types of sealing devices.

In the outline drawing of the general view of the drive, the following should be given:

• dimensions: overall, mounting, connecting,

• the numbers of the positions of the assembly units making up the drive, as well as the parts not included in the assembly units.

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