Abstract
The paper presents a new constructive and functional solution of flexible coupling with bolts and nonmetallic intermediary elements. The bolts have a special shape in the sense that they have a milled area on a certain length equal to the width of the non-metallic element, a cylindrical area that reduces the stress concentrators at the diameter passages. The novelty of this coupling consists of the existence of one intermediary disk between two semi couplings (driver and driven semi couplings). This is fixed by the semi-coupling on the right side, the intermediary disc having milled four locations in which to mount the left, as the right has a metal plate with a special shape of eight metallic plates that are mounted with screws in the four milled places processed on the intermediate disc. The nonmetallic elements have various forms and can be made from different qualities of rubber mounted on the bolts. Eight milled bolts (four on each semi-coupling) allow the transmission of the torsion moment in both directions of rotation, in one direction becoming rigid and thus behaving like a safety coupling. Finite element method is used to obtain the mechanical response of this new type of coupling.
Highlights
Performing the functions characteristic of flexible couplings with non-metallic elements: transmission of rotational motion and torsion moment; taking over the position albeit deviations of the shafts; shock and vibration damping; Safety in operation: superior mechanical strength of the fastening screws of the two semi-couples of the cylindrical centering stud; Economic requirements: execution processes and means of economic processing; Establishment of technology for semi-manufactured: non-metallic elements made by vulcanization; semi-couplings are obtained by free forging or molding; the intermediate disc is obtained by free forging; bolts are made of round laminated steel; metal plates are made of square laminated steel; Maintenance conditions: simple maintenance; visual control at each use; Ergonomic costs and requirements: simple constructive form; minimum material consumption, cost per minimum product
From the results presented for the stresses to traction/compression and tF 2 0,55MPa effective at 1,5MPa sF 1 0,24MPa as 7 MPa crushing, it follows that the three constructive forms of the non-metallic element resist
N∙m for calculation algorithm thebe flexible coupling milled bolts and non-metallic theelements third form of the non-metallic element; presented is original and based on the hypothesis made in the paper;
Summary
Rotating machines in which the drive system and the working machine are different require an adapting element in order to transmit power between the two sides. Driver machine (electric motor): characterized by engine power P(kW) and speed n (rot/min); Maximum diameter of d (mm) shafts on which the semi-couplings are mounted; Coupling gauge: L (mm)—length of coupling, De (mm)—exterior diameter of semi coupling; Limits (minimum, maximum) of the torsion moment transmitted by coupling: Mtmin , Mtmax (Nmm); Performing the functions characteristic of flexible couplings with non-metallic elements: transmission of rotational motion and torsion moment; taking over the position albeit deviations of the shafts; shock and vibration damping; Safety in operation: superior mechanical strength of the fastening screws of the two semi-couples of the cylindrical centering stud; Economic requirements: execution processes and means of economic processing; Establishment of technology for semi-manufactured: non-metallic elements made by vulcanization; semi-couplings are obtained by free forging or molding; the intermediate disc is obtained by free forging; bolts are made of round laminated steel; metal plates are made of square laminated steel; Maintenance conditions: simple maintenance; visual control at each use; Ergonomic costs and requirements: simple constructive form; minimum material consumption, cost per minimum product.
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