Mechanic and Hydraulic Gears
FSI-QMHAcad. year: 2018/2019
The course deals with the following topics – Mechanic transmissions: shiftable gearboxes of working machines, epicyclic gears, final drives, differentials. Hydrostatic transmissions: elements of hydrostatic mechanisms - converters, elements for pressure regulation, elements for flow regulation, elements for flow direction regulation, auxiliary elements, proportional elements. Calculation of hydrostatic circuits, starting and braking, thermal balance. Hydrostatic circuits of working machines. Hydrodynamic transmissions: hydrodynamic couplings and hydraulic torque converters.
Learning outcomes of the course unit
Students will be acquire knowledge of designing and construction especially of mobile machines from the selected field. They will widen and deepen their knowledge of design of regulative hydrostatic circuit – with respect to the latest development trends.
Successful completion of the course is conditional on the basic knowledge of technical mechanics, physics, higher mathematics, machine parts and their mechanism, hydromechanics and principles of electrical engineering.
Recommended optional programme components
Recommended or required reading
ŠKOPÁN, M.:Hydraulické pohony strojů. Elektronické skriptum VUT FSI Brno, 2009 (CS)
Majmudar, R.S.: Oil Hydraulics Systems, McGraw-Hill 2003, ISBN 0-07-140669-7 (EN)
Pavlok, B. – Hružík, L. – Bova, M.: Hydraulická zařízení strojů. VŠB – Technická univerzita Ostrava, 2007, 123 s. (CS)
Planned learning activities and teaching methods
The course is taught through lectures explaining the basic principles and theory of the discipline. Exercises are focused on practical topics presented in lectures. Teaching is suplemented by practical laboratory work. Part of the course can be excursions to the companies, which manufacture or operate the equipments from the thematic area of education.
Assesment methods and criteria linked to learning outcomes
The examination consists of a written and an oral part. Written part of examination is evaluated by 50 points and it is necessary to get at least 20 points to continue in the oral part. Oral examination is marked independently and it is the same weight at the written part.
Language of instruction
The aim of the course is to widen and deepen students’ knowledge of machine parts and mechanisms and hydraulic machines with respect to the building and transport machines.
Specification of controlled education, way of implementation and compensation for absences
Course-unit credit is awarded on condition of having attended the seminars actively and completed all tasks, as well as fulfilled the requirements of continuous control. Presence in the exercises is obligatory.
Type of course unit
39 hours, optionally
Teacher / Lecturer
1. Main components of mechanical gearboxes and their classification, epicyclic gear
2. Combined gears, wave and harmonic gears. Joints and jointed shafts
3. Friction gearing, variators, gearboxes for drive of lifting machines
4. Theory of hydrostatic mechanisms, continuity equation, Bernoulli’s relation
5. Hydraulic resistances in the hydrostatic mechanisms
6. Transmission of energy in the hydrostatic mechanisms – resistances H, R, D
7. Switching-in resistances of the same and different type, resistance network
8. Starting and braking hydrostatic mechanisms, heat calculation of hydrostatic circuits
9. Components of hydrostatic mechanism – converters and their parameters
10.Components for pressure, orientation and flow rate control
11.Proportional elements, auxiliary elements
12.The ground of hydrostatic mechanisms design
13.Hydrodynamic transmissions, combine transmissions
18 hours, compulsory
Teacher / Lecturer
1. week Design of epicyclic gear including geometric condition
2. week Calculation of Hooke’s joint. Multichange box – range of transmission
3. week Driving drum of the conveyor belt, driving wheel of the earthwork machine
4. week Fluid of hydrostatic circuits and their properties
5. week Hydraulic loss in hydrostatic mechanisms
6. week Calculation of resistances across movement, acceleration, deformation
7. week Calculation of starting and braking hydrostatic mechanisms
8. week Heat calculation of hydrostatic mechanisms
12. week Calculation of operation factors of hydraulic circuits
13. week Application of hydrodynamic couplings and converters in mobile machines, devices
labs and studios
8 hours, compulsory
Teacher / Lecturer
Week 9: Characteristics of converters and their application in hydrostatic circuits
Week 10: Application of the components for pressure, orientation and flow rate control
Week 11: Control of hydraulic circuit parameters – speed