 Cherry Electrical Products' GS101201 senses the rotational speed of ferrous gear-type targets such as web speed gears, power transmission gears, roller-chains, sprockets, and bolt heads. |
Cherry Electrical Products' GS101202 geartooth speed sensor offers zero-speed sensing and a self-adjusting range. This compact sensor module uses a Hall-effect IC and internal biasing magnet to sense rotational speed of ferrous gear-type targets such as web speed gears, power transmission gears, roller-chains, sprockets, and bolt heads. Its rugged construction and immunity to dirt, grease, and oil make it suitable for applications in transmissions, braking, and electronic fuel-injection systems.
As a gear-type target rotates, the sensor's integrated logic recognizes changes in flux density caused by the presence or absence of ferrous material. The sensor automatically self-adjusts to tolerance variations resulting from gear wobble or wear.
According to Cherry, unlike traditional analog speed sensors, the GS101202 integrates all signal processing within the sensor, resulting in a digital output and eliminating the need for external signal processing. Another advantage over analog speed sensors, claims the company, is that the amplitude of the sensor signal is independent of target frequency, making it suitable for low- and zero-speed applications.
The sensor is supplied with an open collector (sinking) output. Supply voltage can range from 5 to 24 V dc, and its maximum supply current is 6 mA. The sensor is capable of sinking up to 25 mA. Circuitry integral to the sensor module provides protection against electrostatic discharge, electrical transients, and reverse polarity. It is packaged in a durable glass-filled thermoplastic molded housing with a 17.8-mm (0.7-in) diameter and a barrel length of 31.8 mm (1.25 in). Standard operating temperatures range from -40 to +125°C (-40 to +257°F).
IMPCO Technologies, Inc. is releasing an all-new series of next-generation fuel systems for industrial applications such as forklifts and power generation units marketed under the Spectrum brand name. IMPCO estimates that the global market for industrial equipment using internal-combustion engines to be over 250,000 units per year.
"The California Air Resources Board (CARB) and Environmental Protection Agency (EPA) are expanding exhaust emissions regulation coverage to include off-road industrial equipment starting (this year)," said Dennis Hartman, Vice President and General Manager of IMPCO's Gaseous Fuel Products Division. "Much like automobiles, this equipment must meet a reduced level of tailpipe emissions, which becomes more stringent over the next several years. IMPCO has been on the forefront of advanced, low-emissions fuel technology for over 42 years. IMPCO has taken technology to a higher level to develop these systems, which are tied together through new electronic fuel and engine management controls. These Spectrum systems offer the market a cost effective means of meeting or exceeding CARB/EPA requirements."
The California enactment is the U.S.'s first regulation to reduce emissions from industrial equipment and plans a nearly 70% reduction from phase-in through 2010. In 2004, the initiative becomes national with regulation through the EPA. The 2001 roll-out calls for 25% of industrial products sold to meet the requirement, followed by 50, 75, then 100% each year after. The regulation applies to industrial equipment using internal-combustion engines under 130 kW (175 hp) such as forklifts, portable welders, wood chippers, airport equipment, sweepers, portable generators, personnel lifts, and some agricultural and construction equipment. Over 5000 pieces of equipment entering California in 2001 will be affected. By 2004 when the regulation goes national, nearly 100,000 pieces of industrial equipment annually will be required to have emissions controls.
The Spectrum series of next-generation fuel systems is available through the company's Industrial Engine Systems division located in Sterling Heights, MI. Product introduction includes three microprocessor-based configurations: a solenoid assist carburetion system, a central fuel injection system, and a port injection system. The company has worked closely with global industrial OEMs to develop and release the new series of fuel systems.
 Like Denison's earlier vane pumps, the company's T6DDS (shown), T6DDCS, and T67DDBS compete with both fixed- and variable-displacement pumps. |
Denison Hydraulics has extended its fixed-displacement vane pump line with the addition of three multi-section units featuring new housings and enhanced power-to-space weight ratios. In addition to their compact size, the pumps operate at high pressure and low noise levels. Their design and performance capabilities include new applications on industrial, mobile, and marine equipment. Specific examples include plastic injection molding machines, presses, bailers, mobile cranes, harvesters, winches, and cranes.
The three new pumps include the T6DDS, T6DDCS, and T67DDBS. The designations refer to the various configurations available in terms of the number, displacement, and pressure rating of the cartridges in one housing. The maximum pressure ratings for the new units range from 24 to 30 MPa (3.5 to 4.3 ksi).
All of the pumps benefit from Denison's innovative vane pump technology. The units have bi-rotational, hydrostatically balanced cartridges that provide flexibility in terms of component combinations (displacement, rotation, porting). The double-lip vane design provides enhanced contamination tolerance and longer operational life.
Vane loading against the cam ring is accomplished with a pressure-fed pin under each vane rather than the use of a spring or intra-vane, allowing the load to be directly proportional to pump discharge pressure, reducing wear, and preventing overshoot-pressure vane blow-off. Higher pressures and speed are possible with the pin-loaded configuration.
The use of a dry lubricant on the cam ring adds to wear-resistance capability and further extends pump life. It also improves start-up and break-in characteristics.
