A gear with translational wheel for a variable transmission ratio and applications to steering box

Alexandru, Petre; Macaveiu, Dragos; Alexandru, Cătălin

doi:10.1016/j.mechmachtheory.2012.02.005

Cited by 23 publications

(12 citation statements)

References 6 publications

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“…The equations of this model can be expressed as where m is the mass of the vehicle, u is the longitudinal velocity, v is the lateral velocity, F xij are the longitudinal forces at each wheel, F yij are the lateral forces at each wheel (where the subscript ij represents different wheels with fl representing the front left wheel, fr representing the front right wheel, rl representing the rear left wheel and rr representing the rear right wheel), r is the vehicle yaw rate, I z is the inertia moment about the vertical axis, B f is the track width of the front axle, B r is the track width of the rear axle, a is the distance from the front axle to the centre of gravity of the vehicle, b is the distance from the rear axle to the centre of gravity of the vehicle and d is the steered tyre angle, which is the average value for the two front wheels. In general, d can be expressed as u/i ts , where u is the steering-wheel angle and i ts is steering transmission ratio, which usually remains a constant value when the steering angle 35 is less than 300°(the details of a gear with a variable ratio can be found in the papers by Alexandru et al 36,37 but are not considered here).…”

Section: Vehicle Modelmentioning

confidence: 99%

Investigation of a steering defect and its compensation using a steering-torque control strategy in an extreme driving situation

Liu

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Road feel is mostly represented by the steering torque or the steering-torque gradient of the lateral acceleration, and it is used by the driver to adjust the vehicle states and to control the vehicle. A steering defect indicated by a decreasing steering torque with increasing lateral acceleration makes the driver lose road feel and may result in a wrong operation and even a traffic accident. The case where the driver loses road feel can be regarded as an extreme driving situation. This paper investigates the steering defect and proposes a steering-torque-based control strategy to improve road feel in a vehicle in an extreme driving situation. The steering torque and the steering-torque gradient extended to the non-linear region of the vehicle are analysed and simulated, and both the simulation results and the experimental results indicate that the steering defect exists when the lateral acceleration is relatively high. Thus, a steering-torque control strategy is proposed on the basis of the torque gradient to improve road feel in an extreme situation. This steering-torque control strategy helps to maintain road feel by employing an optimized steering-torque threshold. The simulation results of the vehicle with steering-torque control show improved road feel in comparison with that without steering-torque control.

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Section: Vehicle Modelmentioning

confidence: 99%

Investigation of a steering defect and its compensation using a steering-torque control strategy in an extreme driving situation

Liu

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…F. Y. Zheng (Zheng et al, 2018) also provided a new generation method for noncircular gear, through which the generated gear may embody advantages of localized tooth contact and good lubrication in practice. Based on the gear with rack and geared segment, Petre Alexandru (Alexandru et al, 2012) presented the geometric and functional characteristics of a gear with ascending variable ratio. This gear can be used for the steering boxes of some low power vehicles (without servo-system).…”

Section: Introductionmentioning

confidence: 99%

Design of Linear Functional Noncircular Gear with High Contact Ratio Used in Continuously Variable Transmission

Ya-nan¹,

Lin²,

He³

et al. 2020

Preprint

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Continuously variable transmission (CVT) of noncircular gears has the technical advantages of large bearing capacity and high transmission efficiency. This paper focuses on the linear functional noncircular gear pair to realize continuously variable transmission. According to the required working section transmission ratio of noncircular gear pair, the transmission ratio function in the non-working section, was constructed by using polynomial, and then the influence of pitch curve parameters in working section on which in non-working section was also analyzed. Furthermore, the pitch curve of the linear functional noncircular gear pair, which are suitable for transmission, were obtained. In order to improve the stability and bearing capacity of gear transmission, the noncircular gear pair transmission with high contact ratio was designed, and an indirect method to verify the contact ratio by detecting the contact length error of tooth profile was proposed. The error was calculated by comparing the actual contact tooth profile length obtained from the rolling experiment with the accurate value of contact tooth profile length based on the principle of gear and the property of involute profile, and the noncircular gear transmission with high contact ratio was verified.

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“…Dönüş eforunun azaltılması ve daha hızlı dönüş kabiliyeti amacıyla değişken redüksiyon oranlı bir sistem tasarımının gerçekleştirildiği bir çalışmada dişliler arası eksantrikliğin yüksek olması gerektiği vurgulanmıştır [9]. Planet dişli setinin kullanıldığı aktif direksiyon sistemi üzerine yapılan bir çalışmada, kontrol ve hakimiyet kararlılığının yanı sıra yol hissi ile dönüş karalılığında gelişme elde edilmiştir [10].…”

Section: Introductionunclassified

Otonom taşıtlar için hiposikloid direksiyon dişli kutusu tasarımı ve prototip imalatı

Öztürk¹,

Köroğlu²,

Can³

et al. 2018

acperpro

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Otonom taşıtlar &uuml;zerine yapılan &ccedil;alışmalardaki artışın neticesinde, taşıt &uuml;zerindeki mevcut sistemlerde değişimlere gidilmektedir. G&uuml;n&uuml;m&uuml;zde otomobillerde genel olarak kullanılan direksiyon dişli kutuları kremayer tipinde olup, bunların tahrikinde d&uuml;ş&uuml;k hız ve y&uuml;ksek momente sahip elektrik motorlarının kullanılması gereksinimi dişli kutularında yeni yaklaşımların ele alınmasını gerekli kılmıştır. Bu &ccedil;alışmada d&uuml;ş&uuml;k moment ve y&uuml;ksek devirli bir elektrik motor ile tahrik i&ccedil;in uygun red&uuml;ksiyon oranına sahip olan, literat&uuml;rde kullanımına rastlanmamış bir direksiyon dişli kutusu tasarlanmıştır. Hiposikloid dişli sistemlerinin hem istenilen red&uuml;ksiyon oranının sağlanmasında hemde tekerlek d&ouml;n&uuml;ş a&ccedil;ılarının hassasiyetinde b&uuml;y&uuml;k bir avantaja sahip olduğu g&ouml;r&uuml;lm&uuml;şt&uuml;r.

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A gear with translational wheel for a variable transmission ratio and applications to steering box

Cited by 23 publications

References 6 publications

Investigation of a steering defect and its compensation using a steering-torque control strategy in an extreme driving situation

Investigation of a steering defect and its compensation using a steering-torque control strategy in an extreme driving situation

Design of Linear Functional Noncircular Gear with High Contact Ratio Used in Continuously Variable Transmission

Otonom taşıtlar için hiposikloid direksiyon dişli kutusu tasarımı ve prototip imalatı

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