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FOR IMMEDIATE RELEASE |
New Engine Brake
Leading Jacobs Into New Era of Product Development
BLOOMFIELD, Conn., December 12, 1997 -- The Jacobs 690 J-TechTM Engine Brake, which was designed exclusively for the new Mack E-TechTM engine, represents the first product in a new family of advanced hydraulic valve actuation systems for Jacobs Vehicle Systems. Known as J-CamTM Technology, these systems incorporate new advances in valve actuation that are being implemented in a cooperative development process with diesel engine manufacturers throughout the world.
According to Jacobs, the cooperative process is intended to provide the environment through which a number of system benefits can be delivered. Among the benefits could be better retarding performance, improved packaging, reduced weight and increased control of engine valve events. Ultimately, J-Cam Technology will provide Jacobs' customers with the ability to provide "full authority valve actuation" which will facilitate improvements in fuel economy and emissions for all diesel engine applications. By applying J-Cam Technology for braking as a first step, Jacobs has undertaken an incremental approach to developing and expanding valve actuation technologies to other valve functions.
The patented technology that led to the development of the J-TechTM engine brake was a significant J-CamTM breakthrough that is serving as a "first step" in pursuing expanded application of valve actuation technologies. Here's how the J-Tech system works: there is a small bump on the cam that is used to provide a "brake event." By leaving clearance in the system during positive power, this bump is ignored. When braking is desired, the J-Tech brake takes up the clearance. As the bump that provides the brake event comes around on the cam, the J-Tech brake hydraulically passes the motion to the exhaust valve.
Because this braking bump on the cam is ignored when the brake is not in use, it can be positioned to optimize retarding without affecting positive power performance. It is this ability to open the exhaust valve at just the right time that is behind the superior performance of the J-Tech engine brake. The result is a brake that provides 35 percent more horsepower at rated engine speed.
Development of the J-Tech brake would not have been possible without a close working relationship between Mack Trucks and Jacobs Vehicle Systems. Mack and Jacobs optimized the design of the brake and valve train for maximum performance. This close association is another "first step" towards developing more integrated products for the future.
"With J-Cam Technology, we have entered into a new era of product development," said Scott Fowler, vice president of sales and marketing for Jacobs. "The 690 J-Tech and other J-Cam based systems will evolve over the years to provide our customers with improved retarding power first and eventually the versatility of variable valve actuation."
About Jacobs
Jacobs Vehicle Systems is a wholly-owned subsidiary of Danaher Corporation (NYSE: DHR). The Jake Brake® product line is used by all North American heavy-duty diesel engine manufacturers as well as Hino, Hyundai and Mitsubishi in Asia, and Renault V.I. and DAF in Europe. Jacobs Vehicle Systems is headquartered in Bloomfield, Connecticut, where it has a 260,000 square foot design, manufacturing and test facility. Registered to the ISO 9001 standard, Jacobs Vehicle Systems is the world's leading producer of auxiliary braking systems, and can be found on the Internet at www.jakebrake.com.
Contact: Marian Zincke, Director Marketing at (860) 805-5454
Jake Brake®, Jacobs Vehicle Systems™, Jacobs Engine Brake®, and Jacobs Exhaust Brake® are registered trademarks of Jacobs Vehicle Systems, Inc.
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22 East Dudley Town Road - Bloomfield, CT 06002 - Phone: 860-243-1441
A subsidiary of Danaher Corporation www.jakebrake.com
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