In order to reduce weight, improve reliability and increase safety, significant changes in the design of future helicopter transmissions are envisaged. Such designs are likely to place new demands on conventional steels which will eventually result in the capability of the gear steels themselves to become the limiting factor, restricting any further opportunities for transmission design and development.
Get full access to this article
View all access options for this article.
References
1.
KirkD.NelmsP. R.ArnoldB.Residual stresses and fatigue life of case-carburised gears. Metallurgica, 1966, 74, 255.
2.
WeigandH.TolaschG.Fatigue behaviour of case hardened samples. Harterei-Technische Mitteilungen, December 1967, 22 (4), 330.
3.
GrahamR. C.MacPhersonP. B.Pitting tests with a high hardness carburized steel. MOD Contract A12/1427, Westland Helicopters Limited, 1985.
4.
DaviesD. P.GittosB. C.Advanced gear steels for future helicopter transmissions. MOD Contract A93B/983, Westland Helicopters Limited, 1987.
5.
OlverA. V.Fatigue properties of case hardened gear steels. MOD Contract KA 83a/832, Westland Helicopters Limited, 1977.
6.
ShotterB. A.A new approach to gear tooth root stresses. ASME paper 72-PTG-42, 1972.
7.
JatczakC. F.Speciality carburizing steels for elevated temperature service. Metal Prog., 1978, 1.
8.
MackJ. C.BinderS.Experience with advanced high performance gear steels. ASME paper 80-C2/DET-77, 1977, 1.
9.
ThomasG.Retained austenite and tempered martensite embrittlement. Metall. Trans., 1978, 9A, 439.
10.
IrvineK. J.The development of high-strength steels. J. Iron and Steel Inst., October, 1962, 820.
11.
OlverA. V.The role of residual stress in the performance of gears and bearings. AGARD Conference Proceedings, No. 394, 1986.
12.
SpikesH. A.MacPhersonP. B.Water content of helicopter gear oils. ASME paper 80-C2/DET-12, 1981.
13.
CunninghamR. J.Process for carburizing high alloy steels. US Pat. 8, 885, 995, 27 May 1975.
14.
KernR. F.Selecting steels for heat-treated parts. Part II, Case hardenable grades. Metal Prog., December 1968, 94(6), 71.
15.
DaviesD. P.Gear materials in helicopter transmissions. Metals and Materials, July 1986, 342.
