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Theory of Mechanisms and Machines

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Theory of Mechanisms and Machines

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The theory of mechanisms and machines is the first branch of technical science, a study of which is essential! for successful activity in the sphere of mechanical engineering, and is the basis of the education of specialists in this field.

In my country special attention is given to machine building which is one of the principal branches of industry. The other important branches of industry can develop successfully only by proper development of machine building. Without machines it is impossible to attain any significant increase in productivity, mechanization and automation of the process of production.

The theory of mechanisms and machines first became an independent science in my country and has made outstanding progress. The main fields of the science of mechanisms and machines, the structure and classification of mechanisms, kinematics analysis of mechanisms, the combined static and inertia-force analysis of mechanisms and elementary knowledge about the dynamics of mechanisms and machines, are presented in this book in simple form. A. Zinoviev


Author’s note.
Chapter 1.
Structural analysis of plane mechanisms
1. Kinematic pair
2. Classification of kinematic pairs .
3. Diagrammatic representations of kinematic pairs
4. Kinematic cliain
5. Kinematic diagrams
6. Degrees of freedom of a plane kinematic chain
7. Mechanism and machine
8. Classification of mechanisms
9. Replacement of higher pairs by lower pairs
10. Most widespread types of mechanisms

Chapter II. Kinematic analysis of plane mechanisms
11. Introductory
12. Determination of mechanism positions
13. Velocity diagram'
14. Acceleration diagram
15. Kinematic diagrams
16. Analytical determination of velocities and accelerations

Chapter III. Plane mechanisms for the transmission o rotary motion
General ....
Friction drive Gear drive
A. General
B. Compound gearing
C. Theory of gearing
D. The production of toothed wheels
E. . Helical and herringbone wheels
F. Transmission of rotary motion through bodies.
G. Belt drive, Friction drive, Gear drive, Worm gear drive, Belt drive

Chapter V. Cam gears 106
25. Designing of cam gears .106
26. Kinematic analysis of cam gears 114
Chapter VI. Combined static and inertia-force analysis of plane mecfianisms
27. Introductory
28. Determination of the forces of inertia
29. Deterniination of pressures in kinematic pairs
A. A group witli three turning
B. A group with two turning and one extreme sliding pair
C. Combined static and inertia-force analysis of a crank
D. Numerical examples of kinematic analysis andof combined static and inertia-force analysis .

Chapter VII. Friction in kinematic pairs 158
30. Kinds of friction 158
31. Sliding friction of unlubricated bodies .... 158
A. The direction and magnitude of the force of friction. Coefficient of friction 158
B. Angle of friction and friction cone .... 160
C. Friction on the horizontal plane 161
D. Friction on the inclined plane 163
E. Friction of V-shaped slider 165
F. Friction in screws 166
G. Friction in turning pairs 172
H. Friction in pivots .... . . 173
32. Sliding friction of lubricated bodies ... 175
33. Friction of flexible bodies 177
34. Rolling friction 179

Chapter VIII. Motion and work of machines .... 196
35. Efficiency 196
A. Efficiency of the inclined plane 198
B. Efficiency of linkages 201
36. Equation of the motion of a machine .... 205
37. Reduction of forces 207
38. Reduction of masses 214
39. Equation of the motion of the point and link of reduction 220
40. Regulation of the motion of machines .... 221
41. Determining the basic dimensions of the engine flywheel 230