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MAIN GEARBOXES OF "MIL" HELICOPTERS
 
The main gearboxes VR-14 and VR-24 are designed for installation on helicopters Mi-14, Mi-8MT/17, Mi-8АMT/171, Mi-8MTV/172, Mi-24/25/35 and their modifications.
Its purpose is to transmit the power from two engines, i.e. TV3-117M/MT/VM (VR-14), TV3-117V/VMA (VR-24), VK-2500 (VR-14 and VR-24), to the main rotor, helicopter sets and to the antitorque rotor via the tail transmission with the corresponding to the rotation speed change as well as aerodynamic forces from the main rotor and the gearbox casing to the helicopter fuselage. The  main gearboxes circuit is fixed-ratio, planetary.
 

MAIN TECHNICAL SPECIFICATIONS
  

VR-14

VR-24

Gear ratio:

  • to main rotor shaft
  • to tail rotor shaft

 

0,0128
0,1729

 

0,016
0,2158
Inlet shaft rotation speed, nominal, RPM

15000

15000

Power being transferred by main gearboxes: 

  • maximum from each engine, h.p.

  • in the take-off mode, h.p.
  • in the nominal mode, h.p.

 

2100
2х1900
2х1700

 

2360
2х2200
2х1700

Mass, kg

842,5

830

Overall dimensions, mm:

  • length
  • width
  • height

 

1200
880
1760

 

1210
885
1765
Developer: Klimov Сorporation


KRASNY OCTIABR (since 1976) and Reductor-PM OJSC (since 1986) perform full-scale production of the VR-14 main gearbox. The production of VR-14 in KRASNY OCTIABR totaled near 2000 units.
 
KRASNY OCTIABR develops the repair documentation for the VR-14 and VR-24 main gearboxes, performs all types of repair, including overhaul and local field repair.
 

Service lifetime and calendar service life of main gearboxes VR-14

Gearbox layout

Manufacture date

 Service lifetime (SLT) and calendar service life (CSL) Permitted service life for on-condition maintenance (OCM), hours Calendar service lives established for OCM, years
Till the first overhaul Assigned Between overhauls Till the first overhaul Between overhauls
 SLT, hours   CSL, years  SLT, hours  CSL, years  SLT, hours  CSL, years
7870.0100 since 01.04.1979 till 01.05.1983 1000 10 6000 * 1000 8 2000*1 - 1500*2 2000*3 Till the first overhaul - 20

Between overhauls - 20
7870.0200 since 01.05.1983 till 01.07.2000 1000 10 6000 * 1000 8 2000*1 3500*5 1500*2 2000*3
7870.0200 since 01.07.2000 till 01.01.2005 2000 10 6000 * 1000 8 - 3500*5 1500*2 2000*3
7870.0200 since 01.01.2005 2000 10 6000 * 2000*3 10*3 - 3500*5 - -
 

* Assigned calendar service life is defined by service life until the first overhaul and between overhauls.
*1 Bulletins Nos. 200-7-0-0290-4 (6.180.15-БЭ) и 208.6.0.0105.4 (6.140.14-БЭ).
*2 Bulletin No.200-5-0-0419-04 (К7870-02 БЭ-В).
*3 Bulletin No.200-6-0-0423-04 (5.180.43 БЭ-В, БЭ-Г).
*4 Bulletin No.200.8.0.0434.04 (К7870-07 БЭ-В).
*5 For regulated operating conditions in compliance with Resolution No. 612VR-117-08 (the bulletin is being prepared).
 		  

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