Paper 13: Choice of Tooth Type for High-Speed Gearing

1969 ◽  
Vol 184 (15) ◽  
pp. 105-110 ◽  
Author(s):  
R. J. Hicks
Keyword(s):  
High Speed ◽  
Geometric Analysis ◽  
Spur Gears ◽  
Constant Ratio ◽  
Dynamic Effects ◽  
Helical Gears ◽  
Tooth Type ◽  
Pros And Cons ◽  
Helical Gearing ◽  
Very High

The paper considers the pros and cons of spur, single, and double helical gearing. A detailed geometric analysis of the basic load capacities of helical and spur gears, respectively, leads to non-dimensional optimum tooth numbers for each type, having a constant ratio to one another irrespective of size and material. Helical gears are shown to require the same volume as spurs but relatively coarser teeth. Consideration of the possible dynamic effects of characteristic errors leads to the conclusion that spur gears are potentially superior for very high speed applications.

Modeling and Analysis of the Meshing Losses of Involute Spur Gears in High-Speed and High-Load Conditions

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
L. Chang ◽  
Yeau-Ren Jeng ◽  
Pay-Yau Huang
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Load ◽  
Design Parameters ◽  
Physical Parameters ◽  
Spur Gears ◽  
Modeling And Analysis ◽  
Helical Gears ◽  
Viscosity Coefficients ◽  
Pressure Angle

A first-principle based mathematical model is developed in this paper to analyze the meshing losses in involute spur gears operating in high-load and high-speed conditions. The model is fundamentally simple with a few clearly defined physical parameters. It is computationally robust and produces meaningful trends and relative magnitudes of the meshing losses with respect to the variations of key gear and lubricant parameters. The model is evaluated with precision experimental data. It is then used to study the effects of various gear and lubricant parameters on the meshing losses including gear module, pressure angle, tooth addendum height, thermal conductivity, and lubricant pressure-viscosity and temperature-viscosity coefficients. The results and analysis suggest that gear module, pressure angle, and lubricant pressure-viscosity and temperature-viscosity coefficients can significantly affect the meshing losses. They should be the design parameters of interest to further improve the energy efficiency in high-performance, multistage transmission systems. Although the model is developed and results obtained for spur gears, the authors believe that the trends and relative magnitudes of the meshing losses with respect to the variations of the gear and lubricant parameters are still meaningful for helical gears.

Structural changes in silicon-on-insulator material during post-implantation annealing

1986 ◽  
Vol 44 ◽  
pp. 736-737
Author(s):  
C. O. Jung ◽  
S. J. Krause ◽  
S.R. Wilson
Keyword(s):  
Integrated Circuits ◽  
Oxide Layer ◽  
High Speed ◽  
Structural Changes ◽  
Device Fabrication ◽  
Silicon On Insulator ◽  
High Quality ◽  
Radiation Hardened ◽  
Post Implantation ◽  
Very High

Silicon-on-insulator (SOI) structures have excellent potential for future use in radiation hardened and high speed integrated circuits. For device fabrication in SOI material a high quality superficial Si layer above a buried oxide layer is required. Recently, Celler et al. reported that post-implantation annealing of oxygen implanted SOI at very high temperatures would eliminate virtually all defects and precipiates in the superficial Si layer. In this work we are reporting on the effect of three different post implantation annealing cycles on the structure of oxygen implanted SOI samples which were implanted under the same conditions.

YSS HAP72

Alloy Digest ◽  
2019 ◽  
Vol 68 (10) ◽  
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Powder Metallurgy ◽  
Tool Steel ◽  
High Speed ◽  
High Wear Resistance ◽  
Bend Strength ◽  
Temperature Performance ◽  
Very High

Abstract YSS HAP72 is a powder metallurgy high-speed tool steel with a very high wear resistance. This datasheet provides information on composition, hardness, and bend strength. It also includes information on high temperature performance. Filing Code: TS-779. Producer or source: Hitachi Metals America Ltd.

Very High-Speed Report File System

1992 ◽  
Author(s):  
Timothy J. Salo ◽  
John D. Cavanaugh ◽  
Michael K. Spengler
Keyword(s):  
High Speed ◽  
File System ◽  
Very High
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