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PRODUCTS & APPLICATIONS MECHANICAL COMPONENTS new double


stainless steel joints added to range


Double stainless steel joints have been added to norelem’s range of universal joints. Universal joints are


designed to connect rigid shafts whose axes are inclined to each other and are commonly used in shafts that transmit rotary motion, whilst compensating for axle misalignments. Both single and double joints are mounted on plain bearings, which means that the joints can compensate for significantly larger angular


misalignments compared to other types of couplings. In addition, universal joints double also compensate for radial misalignment. While the joints can withstand high rotation speeds, the


maximum speed depends heavily on the working angle and load. But, as a rule, it should not exceed 500 rotations a minute, if possible. Additionally, there are limits to the working angles, which is 45˚ for universal joints single and 90˚ for universal joints double. The joints are available with and without a keyway which, in


conjunction with a keyed joint, ensure that the couplings transmit the load, power and rotation without slipping and within the accuracy requirement of the design. The universal joints are mounted with almost no play, meaning


that they are extremely sustainable in the transmission of loads. In addition, due to the high corrosion resistance of the stainless- steel, the universal joints are particularly suitable for outdoor applications or use in the chemical, food, or pharmaceutical industries where product safety and quality is essential.


norelem https://norelem.co.uk robust bearings ensure loading conveyor remains shipshape


The mining and quarrying industry requires highly reliable equipment that can withstand harsh conditions. So when the bearings on a bend pulley serving a ship loading conveyor had only six months of operating life remaining, the iron ore port turned to NSK for a new solution. Following an investigation, the company


realised that heavy iron ore particle ingress and water contamination in the failed bearing’s lubricant had compromised the service life of the bend pulley. To overcome the problem, the engineering specialists at NSK set about designing a new solution based on the company’s proven line of spherical roller bearings. To begin with, NSK decided to manufacture


the bearings from its HTF tough steel material. According to the company, tough steel is an effective countermeasure to the wear commonly found on the outer ring raceway, where the fixed load zone material is prone to wear when experiencing fine particle ingress. NSK’s long-life HTF series bearings utilise


advanced material engineering and heat treatment technology, thus facilitating superior resistance to wear, seizure and elevated temperatures. The outcome is dramatically


3 design solutions NOvEMbER 2022 4


longer service life and reduced costs for maintenance and unplanned downtime. In fact the HTF series bearings can offer as much as ten times the service life in contaminated lubrication conditions, such as those experienced at the iron


ore port facility, the company explains. NSK also proposed removable nitrile seal


(HNBR) garter sprung seals, which compensate for seal wear to further extend operating life. The lip contact maintains pressure even under misalignment. As a result of this project, the new sealed


spherical roller bearings achieved 12 months of trouble-free operation. In addition, the detachable seal provided the iron ore port facility with the ability to check radial internal clearances using feeler gauges during the fitting process. Their design feature enables accurate


management of the proper clearance as part of bearing assembly procedures. The concept centres on a seal mounted to a ring/holder that is fully detachable (via bolts), providing sufficient access for feeler gauges to perform clearance measurements. Furthermore, this design offers complete interchangeability with existing solutions. At the iron ore port facility, a reduction in lost


production downtime was the major contributor to cost savings totalling €77,376 per annum.


nsK europe www.nskeurope.com


OLDHAM COUPLINgS: MEETINg fOOD AND bEvERAgE EqUIPMENT DEMANDS


According to Ruland Manufacturing, oldham couplings are an ideal solution for food and beverage equipment due to their misalignment accommodation, zero-backlash properties, and balanced design. The company manufactures the hubs in aluminium for general purpose applications and 303 stainless steel for high corrosion and temperature applications, giving designers an off-the-shelf coupling suitable for various servo-driven applications such as connecting a motor to a ball screw, lead screw or gearbox. Such couplings are comprised of two hubs that mate to a centre disk. This three-


piece design allows food and beverage equipment designers to customise oldham couplings with a clamp or set screw hub with inch, metric, keyed, and keyless bores. They have a balanced design for reduced vibration at speeds up to 6,000rpm


and operate with low bearing loads, protecting these sensitive components from premature failure. The oldham disk is available in acetal for zero-backlash and high torque capacity, PEEK for high temperature and corrosion resistance, and nylon for dampening and noise reduction. The use of 303 stainless steel combined with a PEEK disk allows designers to use standard oldham couplings in a wider variety of servo-driven applications. Stainless steel hubs have hardware of like material to maintain consistent corrosion resistance. Ruland adds a proprietary surface treatment to hardware to prevent galling. Ruland oldham couplings are available in bore sizes from 1/8 inch to 1-1/4 inch


and 3mm to 32mm. In addition, disks can be manufactured with a centre hole to allow further shaft penetration or slots for retention hardware to attach the disk to a hub so it can stay in place during disassembly.


ruland manufacturing www.ruland.com


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