The term "Machine elements", literally, refers to the elements responsible for the functions required in the machine as well
as configure the machine. The machine elements have diverse functions to play such as fixation, supporting, guiding, transmission,
control, seal, and lubrication. These functions should have in common a variety of products. For this reason, the mechanical
element has been developed as a component that can be used in common when performing the mechanical design, and is still evolving
now.
Understanding the machine element is an element of machine design, because a mechanical designer must understand the basic structure and operating principle of the machine elements and must select a suitable element. On the other hand, to learn about the history, type, production process, design method and selection method and evaluation method of machine elements themselves are also useful in the design of a variety of industrial products as well as machinery.
In other words, understanding of the mechanical elements, not end to the understanding of the machine parts, it leads to increase the ability of understanding and designing a machine.
This class will focus on four of the mechanical elements of the important in terms of the particular mechanical engineering among the mechanical elements "screw, shaft, bearings, and gear". To learn about these four of mechanical elements systematically will be the basis of mechanical design. It also becomes the basis for understanding the other machine elements. In addition, long history and diversity of the four machine elements will help understand the product design in a broad sense.
Understanding the machine element is an element of machine design, because a mechanical designer must understand the basic structure and operating principle of the machine elements and must select a suitable element. On the other hand, to learn about the history, type, production process, design method and selection method and evaluation method of machine elements themselves are also useful in the design of a variety of industrial products as well as machinery.
In other words, understanding of the mechanical elements, not end to the understanding of the machine parts, it leads to increase the ability of understanding and designing a machine.
This class will focus on four of the mechanical elements of the important in terms of the particular mechanical engineering among the mechanical elements "screw, shaft, bearings, and gear". To learn about these four of mechanical elements systematically will be the basis of mechanical design. It also becomes the basis for understanding the other machine elements. In addition, long history and diversity of the four machine elements will help understand the product design in a broad sense.
This course deals with the history, types, usage and installation method and applications of "screws, shafts, bearings, gears"
to help students obtain a broad understanding of them that helps general product design.
It also covers with mechanical principles, strengths and safety of such four kinds of machine elements to help students obtain a deep understanding of them that helps basic machine design.
It also covers with mechanical principles, strengths and safety of such four kinds of machine elements to help students obtain a deep understanding of them that helps basic machine design.
- Students should be able to describe the relationship of the mechanical elements, machinery, and mechanical design.
- Students should be able to explain the history, applications, and how to use four major mechanical elements (screw, shaft, bearings, gear).
- Students should be able to select a machine element and to assess whether the chosen machine elements meet the required specifications.
| Class schedule | HW assignments (Including preparation and review of the class.) | Amount of Time Required | |
|---|---|---|---|
| 1. | Introduction to machines, machine elements, and machine design. ○Syllabus overview ○Definition and significance of machine elements ○Design processes |
Textbook Section 1.1~1.4 | 190minutes |
| 2. | Some prerequisites of mechanical design ○Precision and tolerance ○Materials for machines ○Exact constraints design |
Textbook Section 1.5, 2.4 ~ 2.7 | 190minutes |
| 3. | Basics of screws ○History and applications of screws. ○Types of screws and threads. ○Standards of screw/threads. |
Textbook Section 3.1 ~ 3.2.4 | 190minutes |
| 4. | Mechanics of screws ○Relationship between axial force and tightening torque ○Maximum tightening axial force in bolts ○Strength of threads |
Textbook Section 3.2.5 ~ 3.2.7 | 190minutes |
| 5. | Design of bolted joints ○Joint constant(load factor) and joint diagram ○Spring constant and embedding coefficient ○Locking of screws. |
Textbook Section 3.2.8 ~ 3.2.10 | 190minutes |
| 6. | Basics of shafts ○Types of shafts. ○Stresses in shafts by twisting and bending. ○Determination of shaft diameter based on strength. |
Textbook Section 4.1.4 | 190minutes |
| 7. | Stiffness of shafts ○Determination of shaft diameter based on stiffness ○Critical speeds ○Critical speeds of shafts with additional weight. |
Textbook Section 4.1.5 ~ 4.1.8 | 190minutes |
| 8. | Couplings ○Significance of joining shafts/axles with couplings ○Types of couplings ○Selection of couplings |
Textbook Section 4.2 ~ 4.4 | 130minutes |
| Problem: Coupling Selection | 60minutes | ||
| 9. | Ball/roller bearings ○Definition and characteristics of bearings ○Types and usage of bearings ○Lifetime calculation |
Textbook Section 5.2 | 190minutes |
| 10. | Plain bearings ○Self lubrication bearings ○Boundary/mixed lubrication bearings ○Fluid bearings |
Textbook Section 5.3 | 190minutes |
| 11. | Basics of gears ○History of gears ○Definitions of gears/teeth dimensions ○Contact ratio |
Textbook Section 6.1 ~ 6.2.5 | 190minutes |
| 12. | Strength of gears ○Materials of gears ○Bending strength of gear teeth ○Surface pressure strength of gear teeth |
Textbook Section 6.2.11 | 190minutes |
| 13. | Backlash and profile shifting of spur gears ○Backlash ○Working pressure angle ○Undercutting and profile shift |
Textbook Section 6.2.6 ~ 6.2.10 | 190minutes |
| 14. | Term-end exam | Review the contents learned until then. | 300minutes |
| Total. | - | - | 2770minutes |
| Short-term Exam | Term-end Exam | Total. | |
|---|---|---|---|
| 1. | 10% | 10% | 20% |
| 2. | 10% | 20% | 30% |
| 3. | 20% | 30% | 50% |
| Total. | 40% | 60% | - |
The final grade will be calculated according to short-term exam (40%) and term-end exam (60%).
This course will give a pass mark (60 points) to students who have successfully found methods for engineering calculation from the textbook and literature and have provided appropriate design values with appropriate bases.
This course will give a pass mark (60 points) to students who have successfully found methods for engineering calculation from the textbook and literature and have provided appropriate design values with appropriate bases.
- There will be a time open for discussion after each class (10 ~ 20 min).
- Course that cultivates a basic problem-solving skills
| Work experience | Work experience and relevance to the course content if applicatable |
|---|---|
| N/A | N/A |
Last modified : Sat Jun 01 04:01:30 JST 2019