Criteria for the Design of High Efficiency Planocentric Transmissions

1992 ◽  
Author(s):  
Juan Carlos Jáuregui ◽  
Rodrigo López Sansalvador
Keyword(s):  
High Pressure ◽  
Detailed Analysis ◽  
Special Interest ◽  
High Efficiency ◽  
Single Stage ◽  
Geometric Constraints ◽  
Design Criteria ◽  
Gear Teeth ◽  
Space Solution ◽  
Pressure Angle

Abstract In this paper, the design criteria for high efficiency planocentric transmissions is presented. The space solution of a single stage planocentric transmission is limited by geometric constraints. These constraints are produced basically by the interference between pinion teeth and gear teeth. Special interest is focused on the interferences of internal gears and a detailed analysis of the influence of teeth parameters, such as addendum coefficient and pressure angle, is included. Conclusions are drawn from the analysis of the interferences and a design criteria is outlined. It was found that the space solution can be wider if pinion and gear are designed with stub teeth and high pressure angle.

Meshing and Bearing Analysis of Nutation Drive with Face Gear

2020 ◽  
Vol 13 (4) ◽  
pp. 352-365
Author(s):  
Guangxin Wang ◽  
Lili Zhu ◽  
Peng Wang ◽  
Jia Deng
Keyword(s):  
Contact Stress ◽  
High Efficiency ◽  
Transmission Ratio ◽  
Contact Strength ◽  
Hertz Contact ◽  
Face Gear ◽  
Compact Structure ◽  
Gear Teeth ◽  
Gear Drive ◽  
Number Of Teeth

Background: Nutation drive is being extensively investigated due to its ability to achieve a high reduction ratio with a compact structure and the potential for low vibration, high efficiency and design flexibility. However, many problems including the difficulty to process the inner bevel gear, less number of teeth in engagement and not being suitable for high-power transmission have restricted its development. Objective: The purpose of this paper is to analyze the contact strength of a patent about a new nutation drive developed based on meshing between two face gears, which has the advantages of both face gear and nutation drive, including large transmission ratio, large coincidence, small size, compact structure and strong bearing capacity. Methods: Based on the meshing principle and basic structure of the nutation face gear drive, the contact strength of nutation face gear transmission is analyzed by the Hertz contact analysis method and FEM method. Results: The maximum stress values of nutation face gear teeth are compared by two methods, which verify the accuracy of Hertz contact analytical method in calculating the contact strength of nutation face gear teeth. Furthermore, nine groups of three-dimensional models for the nutation face gear drive with a transmission ratio of 52 and different cutter parameters are established. Conclusion: The study analyzes the contact stress of fixed and rotary face gears in meshing with planetary face gears, and obtains the distribution law of contact stress and the influence of the number of teeth and parameters of the cutter on the load-carrying capacity.

Hollow anisotropic semiconductor nanoprisms with highly crystalline frameworks for high-efficiency photoelectrochemical water splitting

2019 ◽  
Vol 7 (14) ◽  
pp. 8061-8072 ◽  
Author(s):  
Erhuan Zhang ◽  
Jia Liu ◽  
Muwei Ji ◽  
Hongzhi Wang ◽  
Xiaodong Wan ◽  
...  
Keyword(s):  
Water Splitting ◽  
Special Interest ◽  
High Efficiency ◽  
Semiconductor Nanostructures ◽  
Photoelectrochemical Water Splitting ◽  
Anisotropic Semiconductor ◽  
Structure Morphology ◽  
Tunable Structure ◽  
Pec Water Splitting

Construction of hollow anisotropic semiconductor nanostructures that possess excellent crystallinity, flexibly tunable structure/morphology and aqueous dispersity is of special interest for photoelectrochemical (PEC) water splitting

High Efficiency Combined Aggregate – Submerged Combustion Melter–Electric Furnace for Vitrification of High-Level Radioactive Wastes

2004 ◽  
Author(s):  
L. S. Pioro ◽  
I. L. Pioro
Keyword(s):  
Electric Furnace ◽  
High Efficiency ◽  
High Capacity ◽  
Main Idea ◽  
Melting Process ◽  
Radioactive Wastes ◽  
Single Stage ◽  
Interface Surface ◽  
High Level ◽  
Submerged Combustion

It is well known that high-level radioactive wastes (HLRAW) are usually vitrified inside electric furnaces. Disadvantages of electric furnaces are their low melting capacity and restrictions on charge preparation. Therefore, a new concept for a high efficiency combined aggregate – submerged combustion melter (SCM)–electric furnace was developed for vitrification of HLRAW. The main idea of this concept is to use the SCM as the primary high-capacity melting unit with direct melt drainage into an electric furnace. The SCM employs a single-stage method for vitrification of HLRAW. The method includes concentration (evaporation), calcination, and vitrification of HLRAW in a single-stage process inside a melting chamber of the SCM. Specific to the melting process is the use of a gas-air or gas-oxygen-air mixture with direct combustion inside a melt. Located inside the melt are high-temperature zones with increased reactivity of the gas phase, the existence of a developed interface surface, and intensive mixing, leading to intensification of the charge melting and vitrification process. The electric furnace clarifies molten glass, thus preparing the high-quality melt for subsequent melt pouring into containers for final storage.

scholarly journals Change of juice color during raspberry processing in fruit juice and fruit juice concentrate

2006 ◽  
Vol 51 (1) ◽  
pp. 99-115 ◽  
Author(s):  
Predrag Vukosavljevic ◽  
Branka Bukvic ◽  
Miodrag Jankovic ◽  
Tanja Petrovic ◽  
Snezana Stevanovic
Keyword(s):  
High Efficiency ◽  
Fruit Juice ◽  
Cross Flow ◽  
Hydraulic Press ◽  
Extraction Yield ◽  
Single Stage ◽  
Separation Processes ◽  
Laboratory Equipment ◽  
Lower Viscosity ◽  
Total Anthocyanins

A change of anthocyanins under different conditions of enzymatic treatments, clarification and concentration was determined. A pectin preparation Klerzyme?120, manufactured by DSM, France, specific for "sour fruits" with pH below 3.2, was used for maceration and depectinization. Experiments were carried out by a laboratory hydraulic press. Raw raspberry juice was clarified either by membranes separation processes or by traditional treatments using gelatin and bentonite. For microfiltration and ultrafiltration processes, membrane cut-off should not be below 30,000 g/mol to prevent any color loss. Experiments with membrane separations processes were carried out with five different membranes. A raw depectinized raspberry juice was clarified by cross-flow microfiltration and ultrafiltration using ceramic tubular membranes and hollow fiber polymeric membranes of a molecular weight cut-off of 300, 50 and 30 kg /mol or with a mean pore size of 0.2 urn in the case of microfiltration. Fruit juice concentrations were carried out by a laboratory equipment for vacuum evaporation. Extraction yield by a laboratory hydraulic press was the same in case of single-stage maceration and two-stage maceration. However, due to a lower viscosity, it was observed that single-stage process provides raspberry juice with more color and high efficiency of extraction. It was noticed that thermal breaks of raspberry pulp provide juice containing more total anthocyanins. The clarification using gelatin and bentonite removed about 50% total anthocyanins, while a clarification by a cross-flow ultrafiltration using Carbosep M9, M8 and M7 membranes achieved the highest level of color loss. Total color loss after concentration was 70%. The best results in color protection were observed by a microfiltration through Kerasep membrane, due to its relatively large pores (0.2?m). .

A single-stage full-bridge electronic ballast for high-pressure mercury lamps

2008 ◽  
Author(s):  
Chun-Jen Yao ◽  
Huang-Jen Chin ◽  
Tai-Hung Wang ◽  
Shih-Jen Cheng ◽  
Yu-Kang Lo ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Stage ◽  
Electronic Ballast
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