Course detail

Tractors

FSI-QT Acad. year: 2024/2025 Summer semester

The subject introduces the construction of various functional tractor groups. The emphasis is laid upon the motional mechanics, the interaction with the field, the traction characteristics and the adhesion load of driving wheels as related to the limit load of the substrate. The subject evaluates various systems of transmitting the drive force of the tractor from the viewpoint of achieved efficiency and traction power, while showing the opportunities to increase the traction efficiency by way of the regulation hydraulics of a tractor.

Language of instruction

Czech

Number of ECTS credits

6

Supervisor

prof. Ing. František Bauer, CSc.

Department

Institute of Automotive Engineering

Entry knowledge

Basic knowledge of internal combustion engines and vehicle dynamics.

Rules for evaluation and completion of the course

Conditions for credit: active participation in the exercises. Obtaining a minimum of 10 points (out of 30 possible) on the examination papers, the deadline for which is set at the beginning of the semester. Completion of field measurements and measurements on the test track.
The examination is written and oral. The results of the control works in the exercises and the student's knowledge in the examination are included in the classification assessment.


Attendance in seminars is obligatory, checked by teacher. The way of implementation and compensation of absence is solved individually with subject guarantor.

Aims

The aim of the course is to acquaint students with the utility characteristics of tractors and with the possibilities of achieving the maximum possible efficiency of engine power transfer to tractor power. The objective is to understand the relationship between the technical possibilities of tractors and the possibilities of terramechanics with axle load limits.


The course enables students to gain an overview of the current state of tractor design, in particular the functional transmission nodes
driving forces that are sorted under load, knowledge of hydrostatic
drives, control hydraulics, special linkages and other tractor operating equipment. This knowledge will enable more responsible
decision making on the selection, deployment and use of tractors in operation.

The study programmes with the given course

Programme N-ADI-P: Automotive and Material Handling Engineering, Master's, compulsory-optional

Programme C-AKR-P: , Lifelong learning
specialization CLS: , elective

Type of course unit

 

Lecture

26 hours, optionally

Syllabus

1. Driving gearand power transmission.
2. Driving gear auxiliary drive shaft.
3. Hydrostatic gears of tractors.
4. Exploitation equipment of tractors.
5. Forces influencing tractors with attached implement.
6. Forces influencing tractors four-wheel tractor.
7. Forces influencing caterpillar tractors.
8. Rolling resistance, drving force, slippage,
9. Output balance.
10. Adhesion and pulling efficiency.
11. Puling characteristics.
12. Tractors kit.
13. Performance of tractor aggregations.

Laboratory exercise

14 hours, compulsory

Syllabus


  1. Practical measurement of gearboxes, saw diagram.

  2. Practical measurement of three-point linkage control systems.

  3. Power balance, power transmission by thrust and PTO.

  4. Measurements on cylinder dynamometers.

  5. Adhesion and tensile efficiency, traction and braking characteristics.

  6. Tensile characteristics.

Exercise

12 hours, compulsory

Syllabus


  1. Driveline transmission device.

  2. Multipliers, gearboxes and PTO drives.

  3. Tractor explosion equipment and control hydraulics.

  4. Forces acting on the tractor with implements.

  5. Tractor with all-wheel drive.

  6. Power balance, power transmission by tractor and camshaft.