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Rolling Element-Bearing Mechanics
Published in Maurice L. Adams, Bearings, 2018
The single-row cylindrical roller bearing is the most frequently employed member of the roller-bearing family, used primarily to carry strictly large radial loads. By employing two or more rows of cylindrical rollers, the relative radial-load capacity is accordingly increased without instead employing a single more-prone-to-skidding equivalent-length single roller, Figures 2.12 and 2.13. When the cylindrical roller bearing employs “long” rollers (large length-to-diameter ratio) suitable for lower speed applications, it is called a needle bearing, Figures 2.14 and 2.15.
Bearings
Published in Don Renner, Hands-On Water/Wastewater Equipment Maintenance, 2017
4.51 Needle bearings are used in water or wastewater treatment plants for trolley wheels, pulleys, conveyors, chain hoists, drive mechanisms, clutch mechanisms, and other applications where space is limited and conventional bearings would not fit. As shown in Figure 4.13, the load capacity of a needle bearing is similar to that of single roller ball bearings.
Applications of mechanical systems and technology
Published in Alan Darbyshire, Charles Gibson, Mechanical Engineering, 2023
Alan Darbyshire, Charles Gibson
Needle bearings are roller bearings with long, thin rollers. They are designed for applications where there is limited radial space. Very often the inner race is dispensed with so that the needle rollers run directly on the rotating shaft. They are intended to carry light loads at relatively low or intermittent rotational speeds.
Exploring the Change in Metabolic Cost of Walking before and after Familiarization with a Passive Load-Bearing Exoskeleton: A Case Series
Published in IISE Transactions on Occupational Ergonomics and Human Factors, 2022
G. Diamond-Ouellette, A. Telonio, T. Karakolis, J. Leblond, L. J. Bouyer, K. L. Best
The exoskeleton mimics human anatomy and biomechanics, and it is designed to transfer the load of the user’s equipment (i.e., backpack, fragmentation vest, load-bearing vest) from the winglet through the exoskeleton spine and lower limbs toward the ground (Figure 2). The load transfer principles function by installing the equipment/backpack onto the winglet, which transfers the vertical load into the spine of the exoskeleton. The winglet and each of the vertebrae are connected to the vertebrae below by a compressible rod, and the joint between each vertebrae permits 5° of rotation in all planes. The load is then directed through the sliding belt, partially on the users’ hips and partially on the hip rods. The hip rod is comprised of three mechanisms that mimic human anatomy: 1) directly connected to the sliding belt is a connecting rod used in tension to allow abduction/adduction of the hip; 2) a needle bearing that allows flexion/extension of the hip; and 3) this bearing is connected to the thigh via another needle bearing that can induce rotation to the hip. The load is directed through these three mechanisms and then dispersed in the medial and lateral knee mechanisms that follow the trajectory of the knee with two bars. It finishes medially at the shank with a rotation/translation mechanism and in the ankle rods via a spherical bearing for plantar/dorsiflexion, a single axis below for inversion/eversion and in the sole below the foot of the user to the ground.