Explorer class bearings promise faster speeds & improved reliability

Explorer high-performance, long-life bearings range now includes an improved single-row angular contact ball bearing that delivers a number of benefits for designers and operators of screw compressors, pumps, and gearboxes seeking to reduce the total cost of ownership of this equipment through improved reliability and energy efficiency.

Featuring a redesigned brass cage that delivers reduced noise and vibration levels and improved robustness, the new 40° contact angle bearings significantly increase the limiting speed up to 30 % compared to the previous design.

The new cage geometry and the use of stronger brass material reduce cage contact forces and increase cage strength, ensuring greater tolerance of shock loads and vibration, while delivering the significantly higher speed capability even under severe operating conditions.

In addition to the redesigned 40° contact angle, a new contact angle of 25° is also offered, giving the bearing a further 20% increase in speed over that of the 40° version, while enabling higher radial loads to be accommodated. In each case, the ball-to-cage contact arrangement allows cooler running and greater temperature stability, while noise and vibration levels are reduced by 15% in both the 40° and 25° versions.

Sealed variants of these bearings are also available for applications that may be more difficult to maintain, preventing contaminants from entering the bearing during installation and subsequent operation. Bearing arrangements that include a 40° contact angle unit taking the main load with a 25° unit acting as a back-up bearing offer improved robustness for applications where the axial load is predominantly in one direction, resulting in longer service life.

Explorer class bearings are the result of years of development and accrued expertise in bearing design, tribology, metallurgy, lubrication and machining techniques. The new 40° and 25° Explorer class single row angular contact ball bearings are an attractive option for operators of screw compressors, pumps and gearboxes seeking cooler running, more energy efficient and longer life bearings that will ultimately set their products apart from the competition.

Read More

Cashgate Scandal High ranking official convicted - Capital Radio

Read More

African Cashgate Scandal: Lingerie Fashion Week

Read More

Capital Hill Cashgate Scandal : PRETTY WILD LINGERIE Mercedes Benz Fash...

Read More

Learn about new ideas for the gearbox bearings

Gearboxes have long taken blame as the typical cause for a failure, and for good reason. Many gearboxes fail to pass the five-year mark without need for component repairs or full replacement. But when the industry first got its start, few considered the high winds, vibration, or environmental conditions that turbines must withstand.

“At the time, the same basic gearboxes used at cement mills or in industrial applications were simply hauled up some 300 feet in the air, place inside a nacelle, and expected to work to the same standards,”

Nowdays gearbox is specifically designed for its intended application, such as for use in a wind turbine. However, the “gearbox legacy design issue,” as Brooks calls it, has led to years of lessons learned for the Bearings industry that continue to this day. “For example, Nowdays a  gearbox designed for a brand-new turbine today is exceptionally better than one even made five or seven years ago because of the accumulative knowledge engineers have gained and continue to gain over time.”

Although this progress has led to more durable gearboxes capable of better handling the harsh conditions turbines face, there is still one fundamental challenge. This challenge primarily relates to differences in speed, according to bearings industry. “A turbine’s rotor may be turning at about 15 rpm but the generators are going 1,500 rpm, which represents an increase of 80 to 100 times,”

Typically, a designer would select different types of bearings and lubricants for low and high-speed applications. “But here you have one gearbox handling different speeds and loads with one type of lubricant. This isn’t the best scenario.” the turbine design would make use of two different gearboxes — one for low and one for high speeds — but that’s too complicated and not economical or feasible for the industry.

“Nevertheless, you’re still stuck with a machine that must deal with compound speeds in a harsh and complex environment, while facing high dynamic loads. Over time that leads to failures.” the industry is likely never going to fully overcome this challenge in gearbox-driven turbines, but quality bearings properly maintained are one step in mitigating turbine downtime.

High-speed bearings

Although there is some truth to the statement that a gearbox is only as good as its components, even the highest quality equipment has a limited life expectancy in the industry. Bearings offer no exception.

Bearings serve numerous roles in a wind-turbine gearbox and show different failure rates based on their position. For example, planet carriers and low-speed bearings work with some thrust load but generally have a low failure rate.

Planetary bearings

While high-speed bearings have the highest failure rates and low-speed bearings have some of the lowest, planetary bearings rank somewhere in between. Life expectancy is about 10 years before failures typically set in, although this can vary depending on the make and model of the gearbox.

“But regardless of gearbox model or bearing type, we generally find that deflections and loading problems are the primary issues with planet bearings”, “This is because of the variable loads that come into the gearbox and cause undesired deflections. This is made worse when the main bearing wears and lets even more thrust and load than intended into the gearbox. Over time, these forces take a toll.”

Integrated bearings

A bearing typically has three pieces: the rollers, an inner race that is pressed onto a shaft, and an outer race that is pressed into the gear bore. But now there are options that integrate the inner race with the shaft or the outer race with the gear, or both, into one solid component. “Integrating essentially machines the bearing’s outer race into the inner bore of the gear,”

An integrated bearing reduces the total number of components in the assembly by directly machining bearing races into the surrounding components of a gearbox. It is an option for cylindrical and tapered gearbox planet bearings.

“In some ways it brings complexity into the manufacturing process because bearings are not made at gear plants nor are gears made at bearing plants,” says Brooks. “But there are a lot of advantages to integrating the two.” Most notably: integrated bearings show improved performance and greater power density.

Read More

Cashgate scandal malawi: Lingerie Fashion Week Desfile Triya SPFW Vero 2...

Read More

scandal joyce banda: Award-Winning Kids Books

Read More