LMI Technologies
LMI Technologies
OEM Play Store
OEM Play Store
OEM Update
.

Planetary gearbox: cost-effective and power saving solution

By February 12, 2015 12:59 pm IST

 In today’s competitive world planetary gearing is becoming more popular, cost and power saving gearings and used in a wide range of applications as alternative to other type of gearboxes.
IntroductionEpicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear. Typically the planet gears are mounted on a movable arm or carrier which itself may rotate relative to the sun gear. Epicyclic gearing systems also incorporate the use of an outer ring gear or annulus, which meshes with the planet gears. Planetary gears (or epicyclic gears) are typically classified as simple and compound planetary gears.
Simple planetary gears have one sun, one ring, one carrier, and one planet set. Compound planetary gears involve one or more of the following three types of structures: meshed-planet (there are at least two more planets in mesh with each other in each planet train), stepped-planet (there exists a shaft connection between two planets in each planet train), and multi-stage structures (the system contains two or more planet sets). Compared to simple planetary gears, compound planetary gears have the advantages of larger reduction ratio, higher torque-to-weight ratio, and more flexible configurations.
The axes of all gears are usually parallel, but for special cases like pencil sharpeners they can be placed at an angle, introducing elements of bevel gear. Further, the sun, planet carrier and annulus axes are usually coaxial.
RatioOne of the planetary gearsets from its transmission has a ring gear with 72 teeth and a sun gear with 30 teeth. Lots of different gear ratios can be obtained out of this gear set, assures the company.
Why planetary?The efficiency loss in a planetary gear train is 3 per cent per stage. This type of efficiency ensures that a high proportion of the energy being input is transmitted through the gearbox, rather than being wasted on mechanical losses inside the gearbox.

Advertising

Your future advertising space? Our media data

The load in a planetary gear train is shared among multiple planets; therefore torque capability is greatly increased. Formula goes as the more planets in the system, the greater load ability and the higher the torque density.
In addition, the planetary gear train also provides stability due to an even distribution of mass and increased rotational stiffness. Torque applied radially onto the gears of a planetary gear train is transferred radially by the gear, without lateral pressure on the gear teeth. They provide multiple kinematic combinations, purely torsional reactions, and coaxial shafting. Planetary gear trains are compact in size, cost effective and higher ratio can be achieved.
Planetary gear trains provide high power density in comparison to standard parallel axis gear trains. Any type of mounting can be possible, and used in wide range of applications.
LimitationsDisadvantages include high bearing loads, constant lubrication requirements, inaccessibility, design complexity and low thermal rating.
ApplicationsGear trains are used in representing the phases of moon on a watch or clock dial. It is also used for driving a conventional two-disk lunar phase display off the day-of-the-week shaft of the calendar. It also finds applications in sugar industries, chemical industries, cement industries, wind mill, marine industries, material handling, construction machineries, crane applications, mining industries, conveyor, paper mills, robotic drive, automatic transmission vehicles, low backlash drive, electric and hydraulic winches, decanter applications, track drives and  many more
 Authored by –
Shinde MMManager Design – Gear Box Division, Involute Technologies Pvt. Ltd. Alandi – Markal, Dhanore, Tal. Khed, Dist. Pune 412 105Email: mmshinde@involutegear.com, www.involutegear.com

Cookie Consent

We use cookies to personalize your experience. By continuing to visit this website you agree to our Terms & Conditions, Privacy Policy and Cookie Policy.

Tags:
Mototech25 Pune
Mototech25 Pune

Events

LWOP
LWOP
IFAT India 2025
IFAT India 2025
India Manufacturing Show
India Manufacturing Show
4th IFFE EXPO 2025
4th IFFE EXPO 2025
Auto EV Bharat 2025
Auto EV Bharat 2025
Laser Engineering Technology Expo
Laser Engineering Technology Expo
Factory Automation Expo 2025
Factory Automation Expo 2025
17th ENGIMACH 2025
17th ENGIMACH 2025
Clean India Show 2025
Clean India Show 2025

eMagazine September 2025

eMagazine September 2025
eMagazine September 2025

Do you want to advertise here? Contact us

Our Sponsors

Pragati Gears
Pragati Gears
Pilz India
Pilz India
Carl Zeiss India
Carl Zeiss India
Atos Profilo
Atos Profilo
Inovance Technology
Inovance Technology
igus
igus
Delta Electric
Delta Electric
Libratherm instruments
Libratherm instruments
Cumi
Cumi
Vega India Level Ltd
Vega India Level Ltd
Marvel Machinery
Marvel Machinery
Wago Pvt Ltd
Wago Pvt Ltd
Super Slides
Super Slides
Bohler
Bohler
Magnets India
Magnets India
Tecnicum
Tecnicum
IMTMA- IMTEX 24
IMTMA- IMTEX 24
Sdtronics
Sdtronics
Jumo
Jumo
Ruby-Mica
Ruby-Mica
Compucare
Compucare
Gloster
Gloster
ACE Micromatic Group
ACE Micromatic Group
Octagon Manufacturing Technology
Octagon Manufacturing Technology
Profectus
Profectus
HMS
HMS
Accu Sharp
Accu Sharp
CS Instruments
CS Instruments
Spac
Spac
Chicago Pneumatic Tools
Chicago Pneumatic Tools
Mennekes
Mennekes
ACD Machines
ACD Machines
phoenixcontact
phoenixcontact
Balluff
Balluff
EAPL
Red Lion
Amsak Cranes
Amsak Cranes
Exorint
Exorint
Balaji switchgears pvt. ltd
Balaji switchgears pvt. ltd
Exon mobil
Exon mobil
Wika Instruments India
Wika Instruments India