|
|
||
 |
FREE GlobalSpec e-Newsletters
Receive the latest news, trends, and technology relevant to your work. (See Titles) |
Chapter 23: Planetary Gear Trains
By Alfonso Fuentes
|
From Gear Geometry and Applied Theory, Second Edtion
23.1 INTRODUCTIONPlanetary gear trains were the subject of intensive research directed at determination of dynamic response of the trains, vibration, load distribution, efficiency, enhanced design, and other important topics [Lynwander, 1983; Ishida & Hidaka, 1992; Kudrjavtzev et al., 1993; Kahraman, 1994; Saada & Velex, 1995; Chatterjee & Tsai, 1996; Hori & Hayashi, 1996a, 1996b; Velex & Flamand, 1996; Lin & Parker, 1999; Chen & Tseng, 2000; Kahraman & Vijajakar, 2001; Litvin et al., 2002e]. This chapter covers gear ratio, conditions of assembly, relations of tooth numbers, efficiency of a planetary train, proposed modification of geometry of tooth surfaces, determination of transmission errors, etc. Special attention is given to the regulation of backlash for improvement of load distribution. 23.2 GEAR RATIOA planetary gear mechanism has at least one gear whose axis is movable in the process of meshing. Planetary Mechanisms of Figs. 23.2.1 (a) and (b)Figures 23.2.1(a) and (b) represent two simple planetary gear mechanisms formed by two gears 1 and 2 that are in external or internal meshing, respectively, and a carrier c on which the gear with the movable axis is mounted. Gear 1 is fixed and planet gear 2 performs a planar motion of two components: (i) transfer rotation with the carrier, and (ii) relative rotation about the carrier. The resulting motion of planet gear 2 with respect to fixed gear 1 is rotation about the instantaneous center I of motion that is the point of tangency of centrodes r 1
Copyright Faydor L. Litvin and Alfonso Fuentes 2004 under license agreement with Books24x7
Products & Services
Gears are mechanical devices that transmit power and motion between axes.
Search by Specification |
Learn more about Gears
Gear manufacturing services design and fabricate gears to customer specifications.
Search by Specification |
Learn more about Gear Manufacturing Services
Specialty or proprietary products and accessories related to gear types.
Learn more about Specialty Gears
Gearboxes and gearheads are speed reducers that consist of a set of gears, shafts, and bearings in an enclosed housing. In converting inputs to outputs, they reduce RPM and increase torque.
Search by Specification |
Learn more about Gearboxes and Gearheads
Helical gears transmit power and motion between parallel axes (opposite hand) or right-angle axes (same-hand).
Search by Specification |
Learn more about Helical Gears
Product Announcements
Topics of Interest
24.1 INTRODUCTION
Generation of worms, screws, and helical gears by milling cutters or grinding wheels is considered. Two types of tools for this process are applied: (i) the finger-shaped tool, and...
(Read More)
15.1 INTRODUCTION
Involute gears, spur and helical ones, are widely used in reducers, planetary gear trains, transmissions, and many other industrial applications. The level of sophistication in the...
(Read More)
21.1 INTRODUCTION
Spiral bevel gears have found broad application in helicopter and truck transmissions and reducers for transformation of rotation and torque between intersected axes. Design and...
(Read More)
16.1 INTRODUCTION
Involute helical gears are widely applied in the industry for transformation of rotation between parallel and crossed axes. Figure 16.1.1 shows an involute helical gear drive with...
(Read More)
Planetary gears are a gearset in which all of the gears are in one plane and grouped around each other like the planets around the sun. Planetary reducers can be designed with gear sets or a set of...
(Read More)
|
|
