Research on the Characteristics of Tooth Shape and Size of the Oval Gear Drive with an Involute Profile

Thai, Nguyen Hong; Thom, Phung Van

doi:10.1007/978-981-19-1968-8_14

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Recently, to increase the load capacity of the NCG drives by increasing the dimension of the teeth, Thai et al [22,23] proposed a new curve referred to as an improved cycloid to the tooth profile of NCG. Unlike other profiles, the improved cycloid profile allows the design with a larger modulus, overcoming the phenomenon of the tooth pointed at the small radius position of the centrode and increasing the gear drive's load capacity [24]. This paper clarifies the advantages of the improved cycloid profile over the involute profile in the design of EG drives.…”

Section: Introductionmentioning

confidence: 75%

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Replacing the involute profile with an improved cycloid profile to improve the bearing capacity for the elliptical gear drives

Thai,

Thom

2024

Vietnam J. Sci. Technol.

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The involute curve is the most widely used in the design of tooth profiles for non-circular gears (NCGs) because of its mathematical simplicity and convenience for design and manufacture. Still, the condition to avoid undercutting often results in a large number of teeth and a small tooth size that reduces the load capacity of the gear drives. On the other hand, in elliptical gears (EGs), a particular case of NCGs, the unequal radii of the centrodes lead to unequal geometric shapes of the teeth arranged on the gear. To overcome the above phenomena and improve the load capacity of the gear drives in this study, the authors applied the improved cycloid profile as the tooth profile of the centered elliptical gear. The paper analyzes and evaluates to verify the disadvantages of tooth geometry of EG drives with the involute profile. On that basis, an improved cycloid curve is applied to improve the irregularity and increase the teeth size distributed on the gear. Two prototype gear drives with the same centrodes with ellipse involute and improved cycloid profiles were manufactured and experimental. The results showed that the EG drives with the improved cycloid profile allowed the design with fewer teeth than the involute profile to make the tooth size larger. Also, the experimental results showed that the practical versus theoretical gear ratio error value of the EG drives with improved cycloid profile and involute profile is 3.37% and 6.67%, respectively. It verified that the EG drives with the improved cycloid profile meshing process more smoothly than those with the involute profile. The research results are significant for applying and developing the improved cycloid profile in designing and manufacturing EG drives requiring high torque and precision.

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Section: Introductionmentioning

confidence: 75%

“…Nevertheless, from the literature [14,24], to avoid the undercutting phenomenon, the modulus c m must satisfy the inequality:…”

mentioning

confidence: 99%

Replacing the involute profile with an improved cycloid profile to improve the bearing capacity for the elliptical gear drives

Thai,

Thom

2024

Vietnam J. Sci. Technol.

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“…However, there has been no research mentioning that changing the fixed angle of NCGs on the intermediate shaft, while this angle can change the gear ratio function. On the other hand, most of the previous studies used the involutes curve of a circle [8,9], cycloid [10] or the Novikov-type arc [11] as the tooth profile, or more recently, the involutes curve of ellipse [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Fixed Angle of the Non-Circular Gears on the Intermediate Shaft on the Gear Ratio Function Characteristics

2023

JST: ETSD

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The paper shows the influence of the fixed angle of non-circular gears (NCGs) on the gear ratio function characteristics of the compound non-circular gear (CNCG) train. The research established a mathematical model describing the centrodes of a typical CNCG train. The fixed angle β of non-circular gears on the intermediate shaft is changed to evaluate its effect on the gear ratio of the CNCG train. The results show that changing the fixed angle of non-circular gears on the intermediate shaft changes the transfer function law of the system and can increase the speed variation range on the output shaft. With the parameters of the designed CNCG train, changing the angle β can increase the amplitude of the gear ratio function to 30.19%. A CNCG train with a speed variation range from 1.37 to 5.11 has been experimentally designed and manufactured with an improved cycloid profile considering the tooth number distribution and satisfying the condition of avoiding undercutting. On that basis, an experimental system to determine the gear ratio of the CNCG train based on the meshing between the gear pairs in the CNCG train has been designed and manufactured. The experimental results showed that the maximum error of the gear ratio function is about 7.63% compared with theoretical ones. In this study, we have not considered the influence of force and torque on the experimental gear ratio. We can apply the results of this research to transmission systems to obtain a speed variation.

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The Design of the Compound Non-circular Gear Train Has an Internal Gears Pair with an Improved Cycloid Tooth Profile

Trung¹,

Thom

Thai

2022

Lecture Notes in Networks and Systems

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Research on the Characteristics of Tooth Shape and Size of the Oval Gear Drive with an Involute Profile

Cited by 7 publications

References 6 publications

Replacing the involute profile with an improved cycloid profile to improve the bearing capacity for the elliptical gear drives

Replacing the involute profile with an improved cycloid profile to improve the bearing capacity for the elliptical gear drives

Influence of the Fixed Angle of the Non-Circular Gears on the Intermediate Shaft on the Gear Ratio Function Characteristics

The Design of the Compound Non-circular Gear Train Has an Internal Gears Pair with an Improved Cycloid Tooth Profile

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