Development of a simulation method for the prediction of transmission errors of injection molded spur gears

2019 ◽  
Author(s):  
Dominik Schubert ◽  
Sebastian Hertle ◽  
Tobias Kleffel ◽  
Dietmar Drummer
Keyword(s):  
Simulation Method ◽  
Spur Gears ◽  
Transmission Errors ◽  
Injection Molded

Computerized Design, Generation and Simulation of Meshing of Modified Involute Spur Gears With Localized Bearing Contact and Reduced Level of Transmission Errors

1997 ◽  
Vol 119 (1) ◽  
pp. 96-100 ◽  
Author(s):  
F. L. Litvin ◽  
D. H. Kim
Keyword(s):  
Computer Programs ◽  
Spur Gears ◽  
Numerical Examples ◽  
Transmission Errors ◽  
Bearing Contact ◽  
Design Generation

The authors propose modification of geometry of spur gears that enable to localize the bearing contact and reduce the level of transmission errors. Methods for generation of spur gears with the modified geometry are proposed as well. Computer programs for simulation of meshing and contact of misaligned spur gears with the modified geometry have been developed. The developed theory is illustrated with numerical examples.

scholarly journals Research on the Design and Modification of Asymmetric Spur Gear

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaohe Deng ◽  
Lin Hua ◽  
Xinghui Han
Keyword(s):  
Computer Aided Design ◽  
Design Method ◽  
Geometric Model ◽  
Simulation Method ◽  
Transmission Error ◽  
Spur Gear ◽  
Geometric Shape ◽  
Spur Gears ◽  
Gear Design ◽  
Aided Design

A design method for the geometric shape and modification of asymmetric spur gear was proposed, in which the geometric shape and modification of the gear can be obtained directly according to the rack-cutter profile. In the geometric design process of the gear, a rack-cutter with different pressure angles and fillet radius in the driving side and coast side was selected, and the generated asymmetric spur gear profiles also had different pressure angles and fillets accordingly. In the modification design of the gear, the pressure angle modification of rack-cutter was conducted firstly and then the corresponding modified involute gear profile was obtained. The geometric model of spur gears was developed using computer-aided design, and the meshing process was analyzed using finite element simulation method. Furthermore, the transmission error and load sharing ratio of unmodified and modified asymmetric spur gears were investigated. Research results showed that the proposed gear design method was feasible and desired spur gear can be obtained through one time rapid machining by the method. Asymmetric spur gear with better transmission characteristic can be obtained via involute modification.

Cavity design method for injection-molded spur gears

2000 ◽  
Vol 14 (1) ◽  
pp. 65-71 ◽  
Author(s):  
Choong Hyun Kim ◽  
Sung-Chul Lee ◽  
Hyo-Sok Ahn ◽  
Tae Hyong Chong
Keyword(s):  
Design Method ◽  
Spur Gears ◽  
Cavity Design ◽  
Injection Molded

Effects of frequency on hysteretic heating and fatigue life of unreinforced injection molded polyamide 66 spur gears

2017 ◽  
Vol 233 (5) ◽  
pp. 781-789 ◽  
Author(s):  
M Kodeeswaran ◽  
Arnika Verma ◽  
R Suresh ◽  
S Senthilvelan
Keyword(s):  
Fatigue Life ◽  
Surface Temperature ◽  
Hysteresis Loop ◽  
Angular Displacement ◽  
Spur Gears ◽  
Polyamide 66 ◽  
Gear Mesh ◽  
Self Heating ◽  
Injection Molded ◽  
Root Crack

Gears are subjected to different rotational speeds/frequencies during their service life. The effect of the rotational speed on the performance of a metal gear is insignificant; however, it affects the thickness of the lubricant film. Polymer gears generate hysteretic self-heating because of the viscoelastic behavior of the material, thereby limiting their performance and usage in applications. The injection molded polyamide 66 spur gears were loaded by ground steel gear at different torques and frequencies using in-house realized servo motor driven gear test rig. Bidirectional loads at frequencies 2, 5, and 7.5 Hz and unidirectional loads at double the frequencies (4, 10, and 15 Hz) were applied on the polymer gears. The surface temperature of the gear due to the material hysteretic self-heating was continuously monitored and was recorded using an infrared thermal camera. Torque applied and angular displacement of the gear mesh were acquired to plot a hysteresis loop. The hysteresis loop area and surface temperature increase with the increase in the torque. Moreover, the bidirectional loads induce higher temperature than the unidirectional loads. This is because the gear tooth deflection increases under the bidirectional loads compared to that under the unidirectional loads for the tested frequencies. The fatigue life of the polymer gears was evaluated at higher frequency for different torques and was compared with that obtained at lower frequency. The gears tested at frequencies 15 and 7.5 Hz under unidirectional and bidirectional loads, respectively, exhibited inferior fatigue life compared to that at 10 and 5 Hz under unidirectional and bidirectional loads, respectively, because the temperature of the gear increases (30.6% and 43.7% for unidirectional and bidirectional loads, respectively) at higher frequencies. Both thermomechanical and root crack failures were observed under the bidirectional loads, whereas the gears exhibited only the root crack failures under the unidirectional loads. The failure morphology studied using the scanning electron microscope indicated straight root crack with overlapping fractured surfaces under both the bidirectional and unidirectional loads.

scholarly journals Investigation on the wear of spur gears generated by modified cutter

Friction ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 288-300
Author(s):  
Fangyan Zheng ◽  
Jun Zhang ◽  
Ligang Yao ◽  
Rulong Tan
Keyword(s):  
Wear Resistance ◽  
Tool Wear ◽  
Tooth Surface ◽  
System Failure ◽  
Spur Gears ◽  
Surface Wear ◽  
Wear Performance ◽  
Transmission Errors ◽  
Wear Damage ◽  
Profile Loss

AbstractTooth surface wear damage is one of the main causes of gearing system failure. Excessive wear leads to tooth profile loss and an increase in transmission errors, as the worn gear surfaces are no longer conjugate. Thus, the enhancement of gear durability against wear is important for gear application. Recent works show that cutter modification can aid in reducing the tool wear in gear processing, while the wear performance of the gears produced by modified cutters is still unknown. Therefore, this study focuses on the wear performance of the gear generated by modified cutter. Numerical results show that the wear resistance can be enhanced through proper cutter modification.

Crowned Spur Gears: Methods for Generation and Tooth Contact Analysis—Part I: Basic Concepts, Generation of the Pinion Tooth Surface by a Plane

1988 ◽  
Vol 110 (3) ◽  
pp. 337-342 ◽  
Author(s):  
F. L. Litvin ◽  
J. Zhang ◽  
R. F. Handschuh
Keyword(s):  
Gear Tooth ◽  
Contact Analysis ◽  
Numerical Results ◽  
Degree Of Freedom ◽  
Tooth Surface ◽  
Spur Gears ◽  
Tooth Contact Analysis ◽  
Tooth Contact ◽  
Transmission Errors ◽  
Basic Concepts

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.

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