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Motor Frame Design
Published in Wei Tong, Mechanical Design and Manufacturing of Electric Motors, 2022
Figure 5.33 demonstrates a cylinder-base fastener that is locked with a retaining ring. The fastener has two grooves at the cylindrical base to receive the retaining ring. To ensure normal performance of the fastener, the fastener base is designed to have a sliding fit with the hole on the motor housing, and the surface of the retaining ring must be in contact with the inner wall of the housing. This type of fastener may lead to less production costs associated with the simple elements, as well as a less complex manufacturing and assembly process.
Characteristic analysis and motion control of a novel ball double-screw hydraulic robot joint
Published in Engineering Applications of Computational Fluid Mechanics, 2022
Jie Shao, Yongming Bian, Meng Yang, Guangjun Liu
The ball double-screw hydraulic joint is driven by balls and the circular spiral groove. The ball is embedded in the spiral groove through the fixed screw (or fixed plug and retaining ring). The end face of the fixed screw (or fixed plug) has a concave spherical surface. The internal and external screw pairs are arranged in reverse, and both are multi-headed spiral grooves. A single-row ball adopts a radial arrangement, while a double-row or multi-row ball arrangement can be adopted to improve transmission stability.
Dual mobility acetabular cups for total hip arthroplasty: advantages and drawbacks
Published in Expert Review of Medical Devices, 2018
Thomas Neri, Remi Philippot, Antonio Klasan, Sven Putnis, Murilo Leie, Bertrand Boyer, Frederic Farizon
The original NOVAE® cup was a cementless DMC, impacted in press-fit [1]. Its fixation was supplemented by tripod anchoring with two pegs (one impacted in the ischium and the other in the pubis) and one superior screw inserted into the iliac wing. This tripod fixation system was designed to withstand rotational and pull-out forces and ensure optimal primary stability. This design has evolved overtime and at different levels, especially since the first patent expired in 1996: – The initial alumina coating on the cup was replaced with a bilayer of plasma-sprayed titanium and hydroxyapatite that provides surface roughness to contribute to bone integration and cup fixation. Materials other than stainless steel have been used, namely cobalt-chrome. Titanium is no longer used in the DMC bearing. Macrostructural elements have also been added to reinforce the primary press-fit fixation.– Press-fit only implants were introduced in the 2000s, mainly for primary THA procedures.– For the UHMWPE liner: º The chamfer and retention mechanisms were redesigned to reduce wear in the retaining ring. The PE is denser, and gamma irradiated under vacuum.º The clearances have been altered to avoid jamming of the inner and outer surfaces of the liner.º DM liners made of cross-linked polyethylene (XLPE) have been introduced recently. The benefits of this latest modification are still being debated.