- Email: [email protected]
Gear design and application
212
(3)
H. Houben: Dynamics of systems having pneumatic cylinders in combination with linkages. The effective operation of a glass-blowing machine's mechanism is discussed. A mathematical analysis of both thermo-dynamic pressure-displacement relations of a pneumatic mass is presented; circuit diagrams of a model by electronic analog computer are given, and representative oscillatory resuhs are discussed.
PART IL Motion Transmission by Special Cams
(5)
G. Schmidt: Dimensional synthesis of cams with flat follower. Valuable design curves are presented (a) for minimum base-circle radius in terms of cam wholerise angle and follower rise, for translating flat follower; (b) in the case of a swinging flat follower, to show the relationship of follower's minimum inclination to the centerline between cam and follower, and also the maximum and minimum center distances, to the desired follower swing-angle and the corresponding cam turn-angle.
(6)
M. Konstantinov: Synthesis of cyclical rolling-cam curves. It is well known that two ellipses can roll against one another, also that two round-cornered squares do likewise. The author here investigates other transmissions between lobed wheels, (e.g. 2-1obed wheel running on 4-lobed, 3-lobed on 12-1obed); their pressure angles and inertia effects are investigated.
(7)
H. P. Stal: Significance of pressure angle in cam drives. Forces and friction on the follower, whether simple push-rod or swinging lever, and the Hertzian stresses on the cam are discussed.
(8) K. Schirmeister: Dynamic characteristics of cam follower motion. The follower is taken as a lumped mass, connected by spring and dash-pot to the cam, and by dash-pot to ground. Frequency responses and phase-shift diagrams are given, when cam velocity input can be expressed as a general Fourier series. F. R. E. CROSSLEY
Georgia Institute of Technology
Gear Design and Application Edited by Nicholas P. Chironis. McGraw-Hill, New York, 1967. 375 pp. JUST short of 100 informative articles, largely, but not exclusively, fromproduct Engineering, have been skilfully assembled by the Associate Editor of that publication. All are of practical value to gear designers. Many are useful to shop men. This material should be invaluable to the many young men who, for the first time outside the classroom, find themselves involved in the design, or inspection, or application of gears. Answers to all of their problems are not here, but a wealth of background information is provided in articles selected because they have survived the test of prior publication and been found good.
213
Information is presented in thirteen categories. Gearing arrangements, gear geometry in its broadest practical meaning, the broad area of specifications, inspection and testing, related efficiency, life and vibration, along with comprehensive discussions of materials and lubrication are some of the divisions. Others include gear shifting and fastening. Gear-related splines, sprockets, and friction drives, as well as unique geared mechanisms, are included. Some editorial shortcomings are inevitable in such a work, but those observed should not prove serious to thoughtful users. The continual progress in technical releases by the American Gear Manufacturers' Association "date" some references, but the serious new student in the field of gearing will have little difficulty in reconciling such references with current material. One might have hoped, but not expected, that the work of compiling so much good information would have included consistent conformity with standard symbols and nomenclature.
ALEXANDER W. LUCE Springfield, Vermont
Peter Black : Mechanics of Machines Pergamon, 1967. 412 figures, ix + 536 pp. Chapter 1.
Dynamics (Elementary particle and rigid body dynamics)
Chapter 2.
Periodic Motion (Simple harmonic motion; pendulums, torsional vibrations; two disks on one shaft, longitudinal and transverse vibrations of a shaft; critical speeds; forced vibrations with viscous Coulomb damping)
Chapter 3.
Triboengineering 1 (Coulomb friction; clutches; belt drives)
Chapter 4.
Gears (Terminology; wheel and pinion calculations; acceleration of gear trains; gear tooth geometry; involute gears; circular arc gears; epicyclics)
Chapter 5.
Mechanisms (Velocity and acceleration diagrams; universal coupling; Geneva stop mechanism)
Chapter 6.
Balancing (Rotary balancing)
Chapter 7.
Reciprocating Mechanism (Kinematics of the slider-crank mechanism; piston inertia, flywheels; inertia effects of connecting rod; balancing of piston inertia effects)
Chapter 8.
Cams (Simple harmonic and constant acceleration cams; roller and fiat followers; velocity and acceleration of follower for specified profiles)
Chapter 9.
Triboengineering 11 (Lubrication; viscosity; lubricants; plain, collar and Mitchell bearings)
Chapter 10.
Control (Introduction; simple remote position control system; step response with proportiona) control; derivative and integral control; harmonic response; Nyquist and Bode diagramsl
(3)
H. Houben: Dynamics of systems having pneumatic cylinders in combination with linkages. The effective operation of a glass-blowing machine's mechanism is discussed. A mathematical analysis of both thermo-dynamic pressure-displacement relations of a pneumatic mass is presented; circuit diagrams of a model by electronic analog computer are given, and representative oscillatory resuhs are discussed.
PART IL Motion Transmission by Special Cams
(5)
G. Schmidt: Dimensional synthesis of cams with flat follower. Valuable design curves are presented (a) for minimum base-circle radius in terms of cam wholerise angle and follower rise, for translating flat follower; (b) in the case of a swinging flat follower, to show the relationship of follower's minimum inclination to the centerline between cam and follower, and also the maximum and minimum center distances, to the desired follower swing-angle and the corresponding cam turn-angle.
(6)
M. Konstantinov: Synthesis of cyclical rolling-cam curves. It is well known that two ellipses can roll against one another, also that two round-cornered squares do likewise. The author here investigates other transmissions between lobed wheels, (e.g. 2-1obed wheel running on 4-lobed, 3-lobed on 12-1obed); their pressure angles and inertia effects are investigated.
(7)
H. P. Stal: Significance of pressure angle in cam drives. Forces and friction on the follower, whether simple push-rod or swinging lever, and the Hertzian stresses on the cam are discussed.
(8) K. Schirmeister: Dynamic characteristics of cam follower motion. The follower is taken as a lumped mass, connected by spring and dash-pot to the cam, and by dash-pot to ground. Frequency responses and phase-shift diagrams are given, when cam velocity input can be expressed as a general Fourier series. F. R. E. CROSSLEY
Georgia Institute of Technology
Gear Design and Application Edited by Nicholas P. Chironis. McGraw-Hill, New York, 1967. 375 pp. JUST short of 100 informative articles, largely, but not exclusively, fromproduct Engineering, have been skilfully assembled by the Associate Editor of that publication. All are of practical value to gear designers. Many are useful to shop men. This material should be invaluable to the many young men who, for the first time outside the classroom, find themselves involved in the design, or inspection, or application of gears. Answers to all of their problems are not here, but a wealth of background information is provided in articles selected because they have survived the test of prior publication and been found good.
213
Information is presented in thirteen categories. Gearing arrangements, gear geometry in its broadest practical meaning, the broad area of specifications, inspection and testing, related efficiency, life and vibration, along with comprehensive discussions of materials and lubrication are some of the divisions. Others include gear shifting and fastening. Gear-related splines, sprockets, and friction drives, as well as unique geared mechanisms, are included. Some editorial shortcomings are inevitable in such a work, but those observed should not prove serious to thoughtful users. The continual progress in technical releases by the American Gear Manufacturers' Association "date" some references, but the serious new student in the field of gearing will have little difficulty in reconciling such references with current material. One might have hoped, but not expected, that the work of compiling so much good information would have included consistent conformity with standard symbols and nomenclature.
ALEXANDER W. LUCE Springfield, Vermont
Peter Black : Mechanics of Machines Pergamon, 1967. 412 figures, ix + 536 pp. Chapter 1.
Dynamics (Elementary particle and rigid body dynamics)
Chapter 2.
Periodic Motion (Simple harmonic motion; pendulums, torsional vibrations; two disks on one shaft, longitudinal and transverse vibrations of a shaft; critical speeds; forced vibrations with viscous Coulomb damping)
Chapter 3.
Triboengineering 1 (Coulomb friction; clutches; belt drives)
Chapter 4.
Gears (Terminology; wheel and pinion calculations; acceleration of gear trains; gear tooth geometry; involute gears; circular arc gears; epicyclics)
Chapter 5.
Mechanisms (Velocity and acceleration diagrams; universal coupling; Geneva stop mechanism)
Chapter 6.
Balancing (Rotary balancing)
Chapter 7.
Reciprocating Mechanism (Kinematics of the slider-crank mechanism; piston inertia, flywheels; inertia effects of connecting rod; balancing of piston inertia effects)
Chapter 8.
Cams (Simple harmonic and constant acceleration cams; roller and fiat followers; velocity and acceleration of follower for specified profiles)
Chapter 9.
Triboengineering 11 (Lubrication; viscosity; lubricants; plain, collar and Mitchell bearings)
Chapter 10.
Control (Introduction; simple remote position control system; step response with proportiona) control; derivative and integral control; harmonic response; Nyquist and Bode diagramsl