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Machine Elements

Course developer

Prior knowledge

MašZ4013, Technical Graphics I

MašZ4014, Technical Graphics II

Course abstract

The course consist of two parts: Machine elements and lifting and transport machines. Course include theory of machine parts and components, calculations and designe. It provides engineering knowledge for creative designing work.

Learning outcomes and their assessment

1. Knowledge - get knowledges about driving mechanism efficiency, gear ratio, power, torque and rotation frequency calculation. Familiar with different type of transmission, coupling, type of transport machine and its main parts - defense of laboratory work, practical work, tests, exam.
2. Skills – knows to calculate, choice and designe of transmission, shafts, bearings, coupling, screw and spline - homework, tests, exam.
3. Competences – ability to apply professional knowledge and skills for machine elements, lifting transport machine parts and component calculation, choice and designing - homework, tests.

Course Content(Calendar)

2 KP (32 h)
Lectures- 16 h:
1. General principles of component design. Mechanical transmissions. Cylindrical gear transmissions (1 h).
2. Conical gears. Worm gear. Planetary gearbox (1 h).
3. Belt transmissions. Flatbed transmissions. V-belt drive transmissions (1 h).
4. Chain transmissions, their use in woodworking machinery and equipment (1 h).
5. Axles and shafts. Shaft design and test calculations (1 h).
6. Bearings. Classification and designation of roller bearings (1 h).
7. Clutches. Clutch structures for woodworking machines and equipment. Selection of clutches and calculation of test (1 h).
8. Test 1 for lecture material. Connections. Threaded connections (1 h).
9. Calculation of threaded joints (1 h).
10. Drives and toothed connections. Structures and types. Calculations (1 h).
11. Welded connections. Types and constructions of welded joints. Calculations (1 h).
12. Lifting machines, their classification. Main technical parameters. The main elements of lifting machines (1 h).
13. Lifting machinery: lifting, driving and turning mechanisms (1 h).
14. Transport vehicles, their main components. Traction Calculation for Transport Vehicles (1 h).
15. Conveyor - belt conveyors, chain conveyors, roller conveyors, inertial conveyors (1 h).
16. Test 2 for lecture material (1 h).

Practical work- 8 h:
1. Calculation of gear ratio (1 h).
2. Calculation of the planetary gear ratio (1 h).
3. Belt transmission calculation (1 h).
4. Axis and shaft calculation (1 h).
5. Calculation of gear unit torque and power (1 h).
6. Calculation of screws. Belt conveyor calculation (1 h).
7. Calculation of the load lifting mechanism (1 h).
8. Test 3 - solving tasks.

Laboratory work- 8 h:
1. Study of reducer (2 h);
2. Study of rolling bearing construction and marking system (1 h).
3. Study of typical shaft embedding units (1 h).
4. Study of electric hoist (1 h).
5. Study of electric winch (1 h).
6. Study of belt conveyor (1|h).
7. Defense of laboratory works (1 h).

Requirements for awarding credit points

Must be developed and defended 6 laboratory works and 2 home works: calculations of transport vehicles and energy-cinematic shaft, and successfully passed the tests.

Description of the organization and tasks of students’ independent work

1. The tasks set in the practical work and the laboratory work must be completed independently, in accordance with the conditions. Learn unclear questions from the literature. Presentation of the work takes place after its completion;
2. Homework’s completion.

Criteria for Evaluating Learning Outcomes

The exam is admitted after successful completion of tests, defense of homework and laboratory work. In the exam, students in writing solves individual tasks and answer theoretical questions. Laboratory works, homework and test work are evaluated in accordance with the assessment procedure specified in the work and at least 60% of the working conditions are fulfilled. A student receives a successful mark on the exam if at least 60% of the tasks are properly resolved.

Compulsory reading

1. Uzkliņģis G. Mašīnu elementi. 1. daļa: Savienojumi. Jelgava: LLU, 2008. 468 lpp.
2. Иванов М.Н. Детали машин: Учебник для машиностр.спец.вузов. 11-е изд.,перераб. Москва: Высшая школа, 2007. 408 c.
3. Uzkliņģis G., Šmits M. Ritgultņi. Jelgava: LLU, 2007. 107 lpp. Ir LLU FB – 12 eks.
4. Uzkliņģis G., Feldmanis J. Skrūves savienojumi. Jelgava: LLU, 2004. 173 lpp.

Further reading

1. Ряховский О. А., Клыпин А. В. Детали машин: Учеб. для вузов. М.:Дрофа, 2002. 288 с. Pieejama elektroniski http://www.twirpx.com/file/50508/
2. Dubbel Taschenbuch fur den Maschinenbau. Dubbel. Hrsg. von. W. Beitz und K. H. Grote. 20., neubearb. und erw. Aufl. Berlin: Springer, 2001. 1796 S.
3. Muhl D., Wittel H., Jannach D., Voiek J. Roloff/Matek. Maschinenelemente. Normung. Berechnung. Gestaltung. 17., uberarb. Auflage. Wiesbaden: Wiewegs, 2005. 791 S.

Notes

Wood processing (Professional Bachelor's Study Programme)