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With two armed conflicts underway impacting economic performance in Eastern Europe and the Middle East, we
continue our investment stance of “Buy on the Sound of Cannons — Selectively” — but readers of Power Transmission
Engineering should not be sanguine.
Geopolitics is beginning to exert significant pressure on several end markets: I specifically refer to oil price. West Texas Intermediate or WTI has dropped from its $95-105 trading
range in late spring to about $75 — about a (25%) drop despite
wo ongoing conflicts because of excess supply.
EDITORS’ NOTE: “The Applications of Bevel Gears” is the excerpted third chapter of Dr. Hermann Stadtfeld’s latest book — Gleason Bevel Gear Technology (The Gleason Works,
Rochester, New York, USA; All rights reserved. 2014; ISBN 978-0-615-96492-8.), which appears here unabridged through the kind graces of Dr. Stadtfeld and Gleason Corp. Future installments will appear exclusively in Power Transmission Engineering
and Gear Technology magazine over the next 12 to
18 months.
Four types of gear devices with great transmission ratios (simply called great ratio gears or GRGs) are
discussed in this paper. They are strain wave gearing devices (SWGs), trochoidal gear reducers (TGRs),
hypocyclic gear reducers (HGRs) and James Ferguson-type planetary drives (JFDs). The structures, advantages and basic performances of these four devices are compared. The latest design and strength analysis methods are also introduced. To conclude, the future tendencies of GRGs are predicted.
What is the recommended method of gripping a spinning shaft (with up to 130
hp of rotational energy) to install pre-tension thrust bearings and conventional
thrust bearings (load = hundreds of pounds) when the shaft cannot have any high points because it must pass through an area of tight clearances to assemble?
Will snap rings still withstand the harsh vibration of this environment?
He was out.
Nine years ago, Ross Rivard left the
coupling industry for the shimmering
new world of luxury automotive components at Lacks Enterprises, where he was immediately enveloped by platinum trim systems and chrome composite wheels. It was glitz and glam and as sparkly clean as the fresh-fromthe-dealership cars his products were embellished onto.
According to the Department
of Energy (DOE), more than
half of all electrical energy
consumed in the U.S. is used
by electric motors. To address
this, several years ago, the DOE conducted
a technical study as to what
could be done to raise the efficiency
levels of “small” motors. After years
of study and litigation, the Small Motor Rule (SMR) was passed that covers two-digit NEMA frame single- and three-phase ¼ through 3 horsepower
motors in open enclosures.
Wind turbine gearboxes are subjected to a wide variety of operating conditions, some of which may push the
bearings beyond their limits. Damage may be done to the bearings, resulting in a specific premature failure mode
known as white etching cracks (WEC), sometimes called brittle, short-life, early, abnormal or white structured flaking
(WSF). Measures to make the bearings more robust in these operating conditions are discussed in this article.
For Mark Findlay
of UK specialist driveline
consultancy Drive
System Design, reducing
gear noise to suit
the low noise levels in
an electric vehicle cabin
has meant throwing away the rule
book.