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  • 1
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    Generation of spiral bevel gears with zero kinematical errors and computer aided simulation of their meshing and contact (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: There is proposed a method for generation of Gleason's spiral bevel gears which provides the following properties of meshing and contact: (1) the contact normal keeps its original direction within the neighborhood of the main contact point; (2) the contact ellipse moves along the gear tooth surface; and (3) the kinematical errors caused by Gleason's method of cutting are almost zero. Computer programs for the simulation of meshing and bearing contact are developed.
    Keywords: MECHANICAL ENGINEERING
    Format: text
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  • 2
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    New generation methods for spur, helical, and spiral-bevel gears (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: New methods for generating spur, helical, and spiral-bevel gears are proposed. These methods provide the gears with conjugate gear tooth surfaces, localized bearing contact, and reduced sensitivity to gear misalignment. Computer programs have been developed for simulating gear meshing and bearing contact.
    Keywords: MECHANICAL ENGINEERING
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  • 3
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    Special cases of friction and applications (1984)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Two techniques for reducing friction forces are presented. The techniques are applied to the generalized problem of reducing the friction between kinematic pairs which connect a moveable link to a frame. The basic principles are: (1) Let the moveable link be supported by two bearings where the relative velocities of the link with respect to each bearing are of opposite directions. Thus the resultant force (torque) of friction acting on the link due to the bearings is approximately zero. Then, additional perturbation of motion parallel to the main motion of the moveable link will require only a very small force; (2) Let the perturbation in motion be perpendicular to the main motion. Equations are developed which explain these two methods. The results are discussed in relation to friction in geared couplings, gyroscope gimbal bearings and a rotary conveyor system. Design examples are presented.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME; 256-260
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  • 4
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    Determination of Principal Curvatures and Contact Ellipse for Profile Crowned Helical Gears (1999)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Helical gears with localized bearing contact of tooth surfaces achieved by profile crowning of tooth surfaces are considered. Profile crowning is provided by application of two imaginary rack-cutters with mismatched surfaces. The goal is to determine the dimensions and orientation of the instantaneous contact ellipse that requires the determination of principle curvatures of pinion-gear tooth surfaces. A simplified solution to this problem is proposed based on the approach development for correlation of principal curvatures and directions of generating and generated tooth surfaces. The obtained equations are applied for profile crowning where the normal profiles of the rack-cutters are either a circular arc or a straight line.
    Keywords: Mechanical Engineering
    Type: Journal of Mechanical Design; Volume 121; 107-111
    Format: text
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  • 5
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    Crowned spur gears - Methods for generation and tooth contact analysis. I - Basic concepts, generation of the pinion tooth surface by a plane (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A topology of crowned spur pinion tooth surface that reduces the level of transmission errors due to misalignment is proposed. The geometry of the deviated pinion tooth surface and regular gear tooth surface, along with tooth contact analysis is discussed. Generation of the deviated pinion tooth surface by a plane whose motion is controlled by a five-degree-of-freedom system is proposed. Numerical results are included and indicate that transmission errors remain low as the gears are misaligned.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME, Transactions, Journal of Mechanisms, Transmission, and Automation in Design (ISSN 0738-0666); 110; 337-342
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  • 6
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    Crowned spur gears - Methods for generation and Tooth Contact Analysis. II - Generation of the pinion tooth surface by a surface of revolution (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A method for generation of crowned pinion tooth surfaces using a surface of revolution is developed. The crowned pinion meshes with a regular involute gear and has a prescribed parabolic type of transmission errors when the gears operate in the aligned mode. When the gears are misaligned the transmission error remains parabolic with the maximum level still remaining very small (less than 0.34 arc second for the numerical examples). Tooth Contact Analysis (TCA) is used to simulate the conditions of meshing, determine the transmission error, and the bearing contact.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME, Transactions, Journal of Mechanisms, Transmission, and Automation in Design (ISSN 0738-0666); 110; 343-347
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  • 7
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    Computerized Simulation of Meshing of Conventional Helical Involute Gears and Modification of Geometry (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An approach is proposed for computerized simulation of meshing of aligned and misaligned involute helical gears. Algorithms for TCA (Tooth Contact Analysis) computer programs were developed. Influence of misalignment on the shift of the bearing contact and transmission errors has been investigated. Numerical examples that illustrate the developed theory are provided.
    Keywords: Mechanical Engineering
    Type: NASA-TM-107451 , E-10732 , NAS 1.15:107451 , ARL-TR-1370
    Format: application/pdf
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  • 8
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    Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new method for design and generation of spiral bevel gears of uniform tooth depth with localized bearing contact and low level of transmission errors is considered. The main features of the proposed approach are as follows: (1) the localization of the bearing contact is achieved by the mismatch of the generating surfaces. The bearing contact may be provided in the longitudinal direction, or in the direction across the surface; and (2) the low level of transmission errors is achieved due to application of nonlinear relations between the motions of the gear and the gear head-cutter. Such relations may be provided by application of a CNC machine. The generation of the pinion is based on application of linear relations between the motions of the tool and the pinion being generated. The relations described above permit a parabolic function of transmission errors to be obtained that is able to absorb almost linear functions caused by errors of gear alignment. A computer code has been written for the meshing and contact of the spiral bevel gears with the proposed geometry. The effect of misalignment on the proposed geometry has also been determined. Numerical examples for illustration of the proposed theory have been provided.
    Keywords: Mechanical Engineering
    Type: NASA-CR-4704 , ARL-CR-287 , NAS 1.26:4704 , E-10086
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  • 9
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    Computerized Design and Analysis of Face-Milled, Uniform Tooth Height, Low-Noise Spiral Bevel Gear Drives (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new method for design and generation of spiral bevel gears of uniform tooth depth with localized bearing contact and low level of transmission errors is considered. The main features of the proposed approach are as follows: (1) The localization of the bearing contact is achieved by the mismatch of the generating surfaces. The bearing contact may be provided in the longitudinal direction, or in the direction across the surface; and (2) The low level of transmission errors is achieved due to application of nonlinear relations between the motions of the gear and the gear head-cutter. Such relations may be provided by application of a CNC machine. The generation of the pinion is based on application of linear relations between the motions of the tool and the pinion being generated. The relations described above permit a parabolic function of transmission errors to be obtained that is able to absorb almost linear functions caused by errors of gear alignment. A computer code has been written for the meshing and contact of the spiral bevel gears with the proposed geometry. The effect of misalignment on the proposed geometry has also been determined. Numerical examples for illustration of the proposed theory have been provided.
    Keywords: Mechanical Engineering
    Type: AD-A309566 , E-10086 , ARL-CR-287 , NASA-CR-4704 , NAS 1.26:4704
    Format: application/pdf
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  • 10
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    Local Synthesis and Tooth Contact Analysis of Face-Milled, Uniform Tooth Height Spiral Bevel Gears (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Face-milled spiral bevel gears with uniform tooth height are considered. An approach is proposed for the design of low-noise and localized bearing contact of such gears. The approach is based on the mismatch of contacting surfaces and permits two types of bearing contact either directed longitudinally or across the surface to be obtained. Conditions to avoid undercutting were determined. A Tooth Contact Analysis (TCA) was developed. This analysis was used to determine the influence of misalignment on meshing and contact of the spiral bevel gears. A numerical example that illustrates the theory developed is provided.
    Keywords: Mechanical Engineering
    Type: NASA-CR-4757 , E-10482 , NAS 1.26:4757 , ARL-CR-312
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