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NEWS
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SKF Introduces Roller Screws for Linear Actuation
(25 Apr,2007)
SKF roller screws for linear actuation provide ideal solutions for factory
automation applications by delivering accurate and precise repeatability, rapid
acceleration and deceleration, and optimized performance at very high rotational
speeds. They can sustain static loads up to 1,000 tons and dynamic loads up to
200 tons, depending on type, and have been engineered for suitability in the
most demanding industrial environments.
Roller screws offer a compact solution with reliable performance in
factory automation applications such as assembly (welding, riveting, and
pressing); handling (clamping, gripping, and robotics); and injection molding
(injection, blow molding, and thermoforming).
Planetary roller screws offer the capability to carry heavy loads for
thousands of hours. Their robust nut can withstand shock loads; their timing
mechanism promotes reliability at high acceleration; and a long lead and
symmetrical nut design permits high linear speeds.
Recirculating roller screws incorporate fine-lead threads (as small
as 1mm) with the capability to optimize high-precision positioning and maintain
greater load capacity.
All roller screws are available in various styles
and a full range of diameters and leads to satisfy particular application
requirements. They can be customized with special surface treatments,
lubrication, solid or hollow screw shafts, and end machining to satisfy
particular application requirements.
SOURCE: SKF,USA |
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Electric cluthches for pump(20 april,2007)
New product
Ogura electromagnetic clutches provide quick and easy engagement and
disengagement of hydraulic pumps, winch drives and other attachments driven by a
gas or diesel engine. Available torque range is 100 foot pounds to 1500 foot
pounds with single-face friction designs.
Large bearings and a single piece bi-directional spring help the
clutch to withstand heavy vibration. Multiple disk units are also available for
mounting inside gear boxes in an oil bath environment and can generate torques
over 12,000 foot pounds.
For more information on Ogura electric clutches please visit
http://www.ogura-clutch.com or contact:
SOURCE: BEARING.COM.CN |
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Revolvo’s SRB Bearings Operate Under Water
Operating
under water, in an abrasive solution, and at ambient temperatures
up to 400C, Revolvo’s SRB split roller bearings are providing
a reliable solution to the problem of support for the twin 11-metre
long Archimedes ascender screws that deliver water to the massive
Zambezi Rapid Water ride in the Gold Reef City theme park, Johannesburg, RSA.
The lower SRB bearings on the ascender screws have been installed to replace
plain bearings that were inefficient under operating conditions of complete
submersion in an abrasive sand and silt solution: this is the result of the
constant churning action of the screw in the water. In contrast, the upper SRB
bearings operate in dry conditions, but have to accommodate hefty 16-tonnes of
axial load.
The twin problems of difficult operating conditions and high
thrust loads are the result of the rides challenging application and the sheer
size of the screw conveyors, which rely on the SRB bearings for location. The
ascender screws are 11m long and 2.7m diameter; they are angled at 30 degrees
and rotate at 27.5 rpm. Together, they are capable of supplying 7 cubic meters
of water per second or 25,200 tonnes per hour.
The lower bearings on the
ascender shafts are 200mm units from SRB’s Light Series range. These bearings
are equipped with a special sealing arrangement that allows them to operate
completely submerged, excluding water and other contaminants from the bearing
enclosure. This is achieved via an arrangement of two lip seals with garter
springs, and centralised positive grease feed. The positive action of the grease
purge between the two seals combined with the efficiency of the sealing
arrangement delivers consistent reliable long- term operation.
The upper
bearings on the ascender screws are 250mm diameter SRB Medium Series units,
designed to accommodate large axial loads. The bearing load is carried between
the inner race shoulder on one side and the outer race lip on the other. Both
shoulders and lips are specially designed to facilitate the generation of an oil
film between the sliding surfaces of roller ends and lips, thereby reducing wear
and limiting heat generation.
SOURCE: BEARING.COM.CN |
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Timken enhances distribution efforts to China
The Timken Company, a worldwide leader in bearings and alloy steel, announced
today that it has established a distribution center in Shanghai, China. Timken
Engineered Products Shanghai Co., Ltd. will import Timken(R) and other
manufacturers' products to China from around the world and become an export hub
for Timken and outsourced products that are sold to global markets.
The
facility, located in the Waigaoqiao Free Trade Area of Shanghai, will perform
distribution for an array of industrial bearings and related components,
primarily for the power transmission market. The facility also will offer
customer service functions.
"This distribution company is one of several
initiatives The Timken Company is pursuing in China. It is a logical next step
in the company's evolution in Asia," says Gordon Robinson, president - emerging
markets. "Our goal is to provide a more efficient import and export mechanism to
facilitate sales growth, and this center will help us accomplish that objective.
China is an exciting emerging market in which to participate, and we are pleased
to be among the world leaders present in Shanghai."
SOURCE: BEARING.COM.CN |
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electric Linear Actuators Offer Simple Operation
Danaher Motion has
launched the Thomson EC and T series of precision electric linear actuators for
the European market. The new EC series offers simple operation with minimum
maintenance and high durability and has the most extensive range of
factory-engineered options available for linear actuators. The Danaher Motion
T-series, designed for the most demanding applications, offers even greater
performance and durability and its high-precision ball screws provide smooth,
quiet operation and accurate positioning at all times, even under the harshest
operating conditions.
The latest Danaher Motion models are particularly
well suited to positioning loads needing space for pivoting and those that are
externally guided or supported, especially ones with extensive
protrusion.
Typical applications for precision electric lifting cylinders
are valve control and the control of cylinders for reeling paper and textile
webs as well as for loading and unloading products or packs in sequential
production and processing.
The new Danaher Motion components can also be
used for moving or linear positioning of work pieces for drilling, welding,
gluing, or thermo-forming.
There are four basic EC models which can
handle maximum loads of 3,600, 7,200, 12,000, or 25,000N - with a maximum
standard stroke of 1.5m achievable with the largest model.
The new EC
actuators move at speeds of up to 1.28 or 1.33m/s and can accelerate at up to
8m/s2.
All models have a repeat deviation of 0.013mm with backlash of
0.25mm for ball-screw versions and 0.4mm for acme-screw versions.
These
latest Danaher Motion precision electric linear actuators can run without
interruption at temperatures of -30 to +70C and meet the requirements of IP54 or
IP65 protection.
A number of accessories are available including magnetic
position sensors, kits for different types of mounting and diverse
extension-tube ends (inside thread, outside thread, clevis, spherical
joint).
The two new T-series models offer maximum strokes of 1.5 or 2m
and can handle loads of 20,000 or 40,000N with load torque of 150 or 300Nm.A
speed of 2m/s can be achieved at up 8m/s2 acceleration.The T-series has a repeat
accuracy of +/- 0.05mm and backlash of either 0.18 or 0.21mm, and is suitable
for continuous use at temperatures from -20 to +70C.IP65 protection comes as
standard.
Precision electric linear actuators, which are quieter and more
accurate than hydraulic and pneumatic components, offer a number of other
advantages.They are cleaner, simpler and more energy efficient as well as being
easier to integrate with modern programmable controls.
SOURCE: BEARING.COM.CN |
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Touring Car Gearbox Uses Sealed Rotary Sensors
Penny + Giles has supplied its SRS280 rotary position sensors to Ray Mallock
(RML) a motorsport and automotive technology company that provides bespoke
design, engineering and manufacturing solutions. The Northamptonshire-based
company is using the sensors on its MG Lola LMP2 and Chevrolet Lacetti World
Touring Car models for the precise measurement of gearbox position: essential
for peak performance. The SRS280 sensors are being used in sequential shift type
gearboxes and measure the angular rotation of the selector barrel to ensure the
right gear is selected.
This method of sensing provides higher accuracy
than microswitch alternatives, which count the number of times the gearstick has
been knocked forward or backwards by the driver.
'Other sensors do not
have the accuracy of the SRS280.They also have a tendency to fail prematurely
because they lack physical robustness.
With the SRS280 this is not an issue,'
explains Jon Wedlake, Electrical Department Manager, RML.'Penny + Giles also
provide flexibility and an extremely fast service that means we can benefit from
short lead times and be confident about meeting construction
deadlines'.
Designed for high reliability in extreme temperatures, high
vibration and shock environments, the SRS280 is available with dust-proof and
waterproof casings sealed to IP50 or IP66, and all versions have an integral moulded cable assembly negating the need for a heat-shrink boot.
Crush
proof mounting flanges feature steel inserts which protect the casing from the
possibility of damage from mounting bolts.
The shaft has a unique double
bearing support system that is designed to withstand the harsh vibration
conditions of an automotive or motorsport environment, ensuring trouble-free
operation with no signal loss.
There is a choice of a D-shaped or 'sprung
ear' shaft, both compatible with existing de-facto industry standards for
straightforward interchangeability on existing equipment.
SOURCE: BEARING.COM.CN |
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SKF, INA/FAG
Partner to Tackle Counterfeit Bearings
SKF AB (Sweden) and
Schaeffler Group (Germany, parent of INA and FAG bearings) are working together
to tackle increasing European distribution of counterfeit bearings.
The
companies issued a joint press release reporting they had been operating over
several months to search out, identify, investigate, and initiate criminal
action against a major counterfeit bearing distributor in the Franconian area.
Approximately 40 tons of counterfeit bearings were seized by
authorities, with a market value exceeding Eur 8 million (USD $10.7 million).
All carried SKF, FAG, or INA brand markings. They were eventually transported to
FAG and destroyed at its Schweinfurt location.
Hans-Jurgen Goslar, a
Schaeffler board member, announced: "With this joint action we want to draw
attention to the fact that brand and product piracy is far from being restricted
to China or southeast Europe. Rather, it is a phenomenon that takes place right
on our doorstep. So it is no longer merely fake luxury and consumer goods that
are flooding the German and European markets but increasingly also
safety-relevant industrial products such as rolling bearings. That's why on this
subject, we maintain intensive cooperation across company and competitor
boundaries."
Schaeffler Group's anti-piracy coordinator, Ingrid
Bichelmeir-Bohn, said: "The financial damage resulting from such counterfeits is
difficult to quantify, even for our companies alone." She went on to point out
that counterfeits not only cause lost sales and tarnish a company's image, they
also bring "enormous" costs for investigating, seizing, and properly disposing
of the counterfeit bearings. Disposal, for example, requires heightened security
measures to ensure full destruction of the seized bearings.
SKF and
INA/FAG also sought to remind customers that counterfeiting damages end users
the most. These are the companies designing, using, and installing bearings into
everything from wind turbines to railcars to machine tools. The costs in lost
revenue, reputation and safety can be enormous.
For a simple example, in
1998 a counterfeit bearing found its way into the gearbox of Mika Hakkinen's F1
race car for the Grand Prix of San Marino. It failed after only 17 laps, forcing
him to retire his McLaren-Mercedes while leading, and handing the win to David
Coulthard.
The Association of the German Tool Manufacturing Industry
estimates 3,500 industrial accidents in Germany each year are due to counterfeit
component failures. The German Engineering Federation estimates the economic
damage is Eur 4.5 billion ($6 billion) every year.
Doris Moller, Acting
Board Member of the German Business Action Group against Product and Trademark
Counterfeiting, argued, "If it weren't for brand and product piracy, there would
be about 70,000 more jobs in Germany."
Because counterfeit bearings are
visually almost identical to the real thing, customers may not be able to
differentiate the fakes before it is too late. The companies took that point and
expanded it to warn against buying from anything but 100-percent reliable
sources -- that is, from manufacturers and authorized distributors and not via
the gray market or from unauthorized channels.
SOURCE: BEARING.COM.CN |
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Klüber Lubrication Introduces Grease for Wind Power Stations
Producers
of wind power stations have had to use greases from a variety of manufacturers
in order to meet the specific requirements of the various bearings involved.
This was necessitated by the different rpms, stresses, sizes and
functions of main, generator, azimuth and pitch bearings, and resulted in a high
financial outlay for the operators concerned in terms of inventories and grease
disposal procedures, plus of course the ever-present risk of getting them
confused. Klüber Lubrication has now succeeded in creating a special base oil
mixture and a carefully constituted package of additives to cover all the
differentiated requirements of the individual bearing lubrication points using a
single product. Klüberplex BEM 41-141, a specialty lubricant for highly stressed
rolling and plain bearings, has been designed for main bearings, which with
their low rpms are subjected to high stresses and vibrations, generator
bearings, which have to cope with high rpms and high temperatures, pitch and
azimuth bearings, which besides high stresses are also subjected to oscillating
movements and vibration. This specialty grease meets and exceeds all the current
requirements specified by the OEMs for bearings and wind power stations.
SOURCE: BEARING.COM.CN |
