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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.
Electric motor-driven systems
are the single largest enduser
of electricity, accounting
for over 40% of global consumption
according to the International
Energy Agency.
If you read only one article this issue, it should
be Norm Parker’s article on the Chinese bearing
manufacturing industry. Parker is an engineer
with General Motors, a true industry insider who has become
a regular contributor to Power Transmission Engineering.