Components of a differential gearbox: two planetary bevel pinions, two satellite bevel pinions with their shaft and the plastic shell.

Components of a differential gearbox: two planetary bevel pinions, two satellite bevel pinions with their shaft and the plastic shell.

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In the automobile industry, the mechanical losses resulting from friction are largely responsible for various kinds of surface damage, such as the scuffing occurring in some mechanical assemblies. These scuffing processes seem to be due to a local loss of lubrication between certain mechanical elements of the same assembly, leading to a sharp incre...

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... The screw pump is stable, safe, and reliable, and it is the second-largest artificial lifting method. It is widely used in general crude oil wells, as well as high-viscosity and high-sand-content oil wells [4][5][6][7][8][9][10][11]. In recent years, electric submersible screw pump rodless lifting has rapidly developed and has become a crucial important technical direction of platform well lifting. ...
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This paper develops a composite weaving structure, combining hexagonal micro-bumps and hexagonal grooves, in the design of the rubber surface of the screw pump. This allows us to solve the problem of high torque and fast wear of the rubber stator during the operation of screw pump lifting oil recovery, based on the bionic hexagonal surface structure, traditional surface damping principle, and fluid dynamic pressure lubrication theory. Finite element analysis is first conducted to quantitatively analyze the impacts of the parallel side distance, groove width, and groove depth on the surface flow field and wall pressure field of the composite hexagonal structure. Based on the simulation law, the rubber surface laser structure is then designed and prepared by nanosecond laser processing. Afterward, tribological experiments are conducted under the condition of long-term immersion in the actual extraction fluid of shale oil wells. This aims at simulating the actual downhole oil production conditions and quantitatively studying the impact of the size of the composite hexagonal structure on the lubrication characteristics of the friction part of the stationary rotor, as well as the effect of abrasion reduction. The results show that, within the simulation range, the smaller the parallel side distance, the higher the load-carrying capacity. In addition, the hexagonal weave with a parallel side distance of 3 mm has a higher wall load carrying capacity than that with distances of 4 mm and 5 mm. When the groove width is equal to 0.4 mm, the oil film load carrying capacity is higher than that in the case of 0.2 mm. When the groove depth increases, the oil film pressure first increases and then stabilizes or decreases after reaching 0.3 mm. In the hexagonal weave, the friction ratio of the rotor is equal to 0.4 mm. In the tribological experiment of hexagonal weave, the smaller the parallel side distance, the smaller the friction coefficient, and the 0.5 mm weave has the highest performance.
... In the automobile industry, the mechanical losses resulting from friction are largely responsible for various kinds of surface damage, such as the scuffing occurring in some mechanical assemblies. These scuffing processes seem to be due to a local loss of lubrication between certain mechanical elements of the same assembly, leading to a sharp increase in the friction, which can lead to a surface and volume damage in some of them, and even can cause, in the worst case, the whole destruction of the mechanical system if it has continued to operate [14]. The frictional properties of smooth rubber substrates sliding against rigid surfaces covered with various densities of colloidal nano-particles (average diameter 77 nm). ...
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Chapter
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Chapter
An important challenge for vehicle designers is to ensure the greatest possible reduction of energy losses. This specific feature can be accomplished very early, at the stage of design and layout of new products. The objective of this paper is to present innovative, systematic and expanded methodology for research and diminishing of mechanical losses in vehicles. During the implementation of the structure analysis of different design options for new products, we assume main principles, the most important of which are the principles of simplicity and clarity. The improved methodology for decreasing mechanical losses in vehicles includes the following innovative stages: an upgraded design of gearboxes; a new approach for calculating the cardan shaft aiming to diminish its internal dynamic load; a new method for calculating the internal meshing of planetary gear trains with high efficiency. The stages mentioned are based on the research of the authors’ team. A considerable advantage of this methodology is its structure. The application of the methodology improved by the authors’ team enriches the procedures for multivariate design, for analysis and evaluation of conceptual design solutions and makes them more precise.