Timken completed the acquisition of Torrington in February 2003. The acquisition of Timken combines the two companies' traditions of quality, technology and innovation. Prior to the acquisition, Torrington and the Bobcats had been working closely together to apply sensor technology solutions in this research. Now, as a whole company, Timken continues to provide a complete friction management solution for the Bobcats. - Editor's note
It can run tons of earthwork for landscape engineering, industrial sites and construction tasks. The Bobcat loader has become a durable and compact machine for customers for 40 years. Over the years, the Bobcats, which are part of Ingersoll Rand, have introduced a range of models and improvements in the loader industry to provide more power and superior performance. One of these products is a skid steer loader that is known for its on-site parking and 360° rotation, allowing it to move freely in tight, tight spaces. To further develop this performance, Bobcat is working on a groundbreaking R&D that will improve the steerability and steering efficiency of its loaders.
To achieve this, the Bobcats need speed and wheel sensors. To accomplish this task, the Bobcats asked Torrington for his experience in sensor technology. The sensor solutions of Torrington and the Bobcats made the most significant breakthrough since the invention of the skid steer loader – all-wheel steering became possible.
"We are well aware of the success of Torrington's sensor technology in automotive and other applications," said Bobcat design engineer Jason Osborn. "We just called and asked if they thought they could design a magnetic sensor that could turn at the Bobcats. Working economically in the tough internal environment of the components, what happened next has created history."
Bobcat challenge
The Bobcats look very simple in theory for the new steering idea: implanting four separate steering wheels. The Bobcat engineering team wanted a non-contact sensor that required longer life and better reliability to meet the need to accurately measure corners in a system that was changing at a tolerance.
Through concerted collaboration, the Bobcats and Torrington engineers presented a major design innovation in which a non-contact sensor was embedded in the spindle of each Bobcat wheel assembly, resulting in a sensor system embedded in the spindle.
The success of Torrington sensor technology stems from the use of magnetic and Hall effect techniques to extract information from each wheel to determine the corners of the wheel. The basic principle of the Hall effect is that the magnetic field can affect the potential in the metal conductor. By introducing sensors and magnets directly into the wheel system, the direction and intensity of the magnetic field are measured at any time to determine the exact position of each wheel. Using this information, the steering system can provide reliable wheel angle feedback information.
Torrington is another tough offer for the Bobcats – designing speed sensors for the ToolcatTM 5600 tool engineering machine. The speed sensor monitors the rate of movement of a multipole ring magnet rotating on the front and rear axles via a custom ASIC sensor chip. As the wheel turns, the sensor detects multiple north and south poles of the ring magnet, reads and transmits the speed data to the steering system. The steering system uses this information to control the speed of the wheels.
Non-contact magnetic sensors and ASIC codes can produce high-resolution signals compared to larger, less durable contact sensors and optical encoders. In addition, its compact size and ruggedness make it possible to function in the previously mentioned limited space that does not seem to be sensitive, or to damage the optical sensor, causing optical or contact sensor misreading and affecting the angular position sensor. The harsh environment of performance, such as high temperature, oil, dust, grease and water. In addition to better durability and precision, the new sensor does not require any external electronics to operate. This revolutionary system dramatically improves the steering and overall performance of these two Bobcat vehicles, making them more productive and easier to handle.
“The Bobcat engineers put these issues in front of us and we responded,†said John Santos, head of smart products and systems at Timken (formerly Torrington). “The more our customers have electronic sensing capabilities. The higher the demand, the more reasonable solutions we provide to our customers, and we have proven records. On the contrary, their success is our success."
Let design put into practice
Torrington's angle and speed sensors are used on the ToolcatTM 5600 and the Bobcat A300 All Wheel Steering (AWS) loader. This A-series is the first product in this class to offer a dual-select steering mode, which is very demanding on sensors, so that the system can easily perform AWS and slip control with a single tap.
In slip mode, the two sides work independently, allowing the loader to reverse rotation with maximum steerability. In addition, the AWS mode allows each wheel to work independently to achieve precise coordinated steering of all four wheels. This allows the inner tube to rotate at a smaller angle and slower speed than the outer tire. When the right and left sides work together in this way, the life of the tire can be extended because the tire no longer rubs on asphalt or other hard surfaces. Again, this approach allows the machine to work softly on grass and other surfaces when it is necessary to reduce the impact on the ground. The steering in AWS mode is also smoother, making the operator more comfortable and minimizing spilled material.
“Since 1958, our skid steer loaders have contributed to changing the way the world works,†Osborn said. “We are very proud because we can continue to improve the performance of our products. Now, by applying Torrington’s sensors Technology, we have improved our work efficiency by one grade."
Each AWS loader uses six sensors, two speed sensors, and four wheel angle sensors. When the angle sensor provides precise steering information from the coordinated action of all four wheels, the speed sensor is used to adjust the wheel speed for the rotary loader to an appropriate ratio. The speed sensor of the AWS loader monitors the speed of the left and right wheels, while the speed sensor on the ToolcatTM 5600 monitors the speed of the front and rear wheels.
By integrating the resources of Torrington and Timken, the company has the ability to provide steering bollards, tapered roller bearings, ball bearings, cams, needle bearings, precision components and bushings for the Bobcats.
“The expertise we provide will continue to increase and strengthen our partnership with Bobcats,†said Timken Regional Sales Engineer Brad Baldwin. “The success of our sensors has opened another door that has made us not only a supply for the Bobcats. Business, it is the provider of the solution."
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Bobcat is a leading manufacturer and distributor of small construction and construction machinery, including skid steer loaders, small track loaders, all-wheel steering loaders, small excavators, telehandlers, backhoe loaders, tool engineering Machinery and related accessories are members of Ingersoll Rand (IR, Woodcliff Lake, NJ). IR is a leading provider of innovation and solutions for major safety and insurance, meteorological control, industrial solutions and infrastructure. In addition to the Bobcats, the company's diverse product line includes a number of engineering and commercial leading brands, including Syracuse locks and safety solutions, Cold King transport temperature control equipment, Hassmann commercial and retail refrigeration equipment, Club Car golf Vehicle and tool vehicles as well as Ingersoll Rand industrial and construction equipment. In addition, IR provides products and services to customers in the industrial and commercial markets under many other premium brands.
Timken
Timken Company (NYSE: TKR, http://) keeps the world running, helping its customers run their products more smoothly, faster and more efficiently in innovative ways. Its high quality bearings, alloy steel and related products and services are everywhere. With operations in 27 countries around the world, Timken has 2005 sales of $5.2 billion and employs 27,000 people, making it the best choice for improving your work (Where You TurnTM).
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