Course Objectives
1. The axial force of a screw can be calculated from the torque applied to the screw and the screw size.
2. The optimum shaft diameter can be calculated from the amount of transmitted power.
3. Bearing life can be calculated.
4. You can perform design calculations to determine spring constants and coil spring specifications.
5. You can perform design calculations to determine gear specifications from the perspective of tooth strength and surface pressure.
Rubric
| Ideal Level | Standard Level | Unacceptable Level |
| Achievement 1 | You can calculate the required torque to obtain the axial force of a screw and the tensile stress acting on the screw. | The axial force of a screw can be calculated from the torque applied to the screw and the screw size. | Under the same situation as in the example, the axial force of the screw can be calculated from the torque applied to the screw and the screw size. |
| Achievement 2 | Spring specifications can be calculated efficiently by using graphs that are effective for calculating shaft specifications. | You can do the basic design of the shaft. | You can design an axis under the same situation as in the example.
|
| Achievement 3 | Bearings can be selected based on the basic dynamic load rating, required bearing life and applicable shaft diameter. | It is possible to calculate the life of a bearing where radial and axial loads act simultaneously. | It is possible to calculate the life of bearings that are subjected to radial loads. |
| Achievement 4 | Spring specifications can be calculated efficiently by using graphs that are effective for calculating spring specifications. | You can do the basic design of coil springs. | A coil spring can be designed under the same circumstances as in the example problem. |
| Achievement 5 | By utilizing graphs that are effective for calculating the specifications of spur gears, the specifications of the spring can be calculated efficiently. | You can do the basic design of spur gears. | Under the same situation as the example problem, you can design the strength of gears.
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Assigned Department Objectives
Teaching Method
Outline:
In order to construct a mechanical product, it is essential to use a wide variety of mechanical elements such as shafts, screws, gears, and springs, in addition to the parts designed by the designer. Therefore, the design, manufacture, and assembly of mechanical products cannot be carried out without mechanical elements.
Style:
In this lecture, you will learn how to calculate the forces and stresses that act on shafts, screws, bearings, springs, and tubes, and how to calculate the life of bearings, which are the basics of designing with consideration to the use of mechanical elements. The aim is to provide students with the ability to appropriately perform design calculations for various mechanical elements. in the class
[Class time 30 hours]
Notice:
At the end of each lecture on mechanical elements, design calculation exercises will be conducted. Be sure to prepare well, review, and concentrate on class.
Characteristics of Class / Division in Learning
Course Plan
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Theme |
Goals |
| 2nd Semester |
| 3rd Quarter |
| 1st |
Fundamentals of mechanical design
|
The relationship between power and torque can be explained, and necessary numerical values can be calculated using the relational expression between power, rotation speed, and torque.
|
| 2nd |
Axial force of screw |
Be able to explain the types and characteristics of screws. The required screw can be designed based on the torque and axial force applied to the screw.
|
| 3rd |
Force on screw |
It is possible to design screws that are subject to shear forces. The length of the screw on which the axial force acts can be designed. Be able to explain the relationship between lead angle and tightening torque and calculate the required tightening torque.
|
| 4th |
Type of shaft |
Be able to explain the types and characteristics of shaft.
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| 5th |
Shafts subject to bending/shafts subject to torsion |
It is possible to design the diameter of the shaft that will undergo only bending or torsion.
|
| 6th |
Shaft that undergoes bending and twisting at the same time |
The relationship between equivalent torsional moment and equivalent bending moment can be explained, and a shaft can be designed where bending and torsion act simultaneously.
|
| 7th |
Shaft stiffness |
Be able to explain the relationship between torsion angle, shaft length, diameter, and torque. Can calculate torsion angle.
|
| 8th |
midterm exam |
|
| 4th Quarter |
| 9th |
Rolling bearing 1 |
Be able to explain the types and characteristics of bearings.
Can explain the meaning of bearing numbers.
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| 10th |
Rolling bearing 2 |
Calculate the lifespan of rolling bearings.
|
| 11th |
Spring element 1 |
Be able to explain the types and characteristics of springs.
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| 12th |
Spring element 2 |
Be able to explain the relationship between coil spring stress and dimensions, and be able to calculate specifications.
|
| 13th |
Gear strength design 1 |
Review of the specifications of spur gears.
Understand the evaluation of bending moment and surface pressure acting on teeth.
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| 14th |
Gear strength design 2 |
It is possible to calculate the optimal module from the viewpoint of strength and surface pressure for a given transmitted power.
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| 15th |
Gear strength design 3 |
It is possible to calculate the optimal module from the viewpoint of strength and surface pressure for a given transmitted power.
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| 16th |
Final exam/return of answers |
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Evaluation Method and Weight (%)
| Examination | Presentation | Mutual Evaluations between students | Behavior | Portfolio | Other | Total |
| Subtotal | 70 | 0 | 0 | 0 | 0 | 30 | 100 |
| Basic Proficiency | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Specialized Proficiency | 70 | 0 | 0 | 0 | 0 | 30 | 100 |
| Cross Area Proficiency | 0 | 0 | 0 | 0 | 0 | 0 | 0 |