Friction Characteristics of Synchronization Process Based on Tribo‐Thermodynamics

Hu, Yan; Xu, Zhaoping; Yuan, Jun; Liu, Liang; Tan, Cao; Ge, Wenqing

doi:10.1155/2018/8467921

Cited by 6 publications

(6 citation statements)

References 20 publications

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“…The locking ring synchronizer of automated mechanical transmission (a two-degrees-of-freedom direct-drive electromagnetic gearshift system) was the research object in this paper, as shown in Figure 1. The schematic diagram of the locking ring synchronizer is shown in Figure 1a, which consists of a synchromesh sliding sleeve, a splined hub, a synchronous ring, a target ring gear, and a locating slider [4,19].…”

Section: Evaluation Index Of Synchronization Performancementioning

confidence: 99%

“…The designed bench had the functions of variable voltage, variable speed, and constant output. The physical object of the synchronizer test-control platform is shown in Figure 5 [19,21]. The mechanical system of the test-control platform included inertia simulator, synchronizer component, shifting fork, displacement sensor (DS), and the connector that connected the components.…”

Section: The Synchronizer Test-control Platformmentioning

confidence: 99%

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Friction Coefficient Compensation Control in Synchronizer Synchronization Process for Transmission

Yuan

et al. 2019

Applied Sciences

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In the synchronization process of a synchronizer, the friction coefficient of the friction cone is changed because of friction heat. In this paper, the influence of a changing friction coefficient on shift quality was analyzed. The quantitative relationship between friction coefficient and its influencing factors was studied through a synchronizer synchronization process test bench. Based on the quantitative analysis and an optimal shift force control method, a compensation control strategy for friction coefficient was established. Moreover, the effectiveness of the compensation control was verified through simulation and experiment. The results showed that the friction coefficient was maintained near the expected value of 0.08 after the compensation control, the shifting speed difference the synchronous time was shortened by nearly 0.12 s, and the sliding friction was reduced by 4.64 J under the experimental conditions. The analysis and compensation of the friction coefficient provide a theoretical reference for improving shift quality.

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Section: Evaluation Index Of Synchronization Performancementioning

confidence: 99%

Section: The Synchronizer Test-control Platformmentioning

confidence: 99%

Friction Coefficient Compensation Control in Synchronizer Synchronization Process for Transmission

Yuan

et al. 2019

Applied Sciences

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“…The researchers' findings demonstrated a direct correlation between the highest recorded temperature of the core tube wall and the depth of sampling. Yan et al 29 researched the changing rules of friction cone temperature and friction coefficient through experiments and simulations. Han et al 30 established the FPS three‐dimensional thermal–mechanical coupling finite element model to obtain the strength and energy consumption of the bearing during operation.…”

Section: Introductionmentioning

confidence: 99%

Intensity analysis of frictional heat source during core tube sampling and drilling

Xu,

Wang,

Zhu

2023

Energy Science & Engineering

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Currently, the heat generated during coal core tube sampling causes rapid gas desorption, leading to substantial measurement errors in laboratory gas content assessments. Reducing these errors requires studying frictional heat from core tube friction against the hole wall and coal core temperature rise. Combining the independently developed device to simulate the thermal effect of coring and the COMSOL finite element analysis software, the intensity of the frictional heat source during the core tube sampling and drilling process was analyzed under different coring depth and rotational speed conditions. The research results show that: At constant speed, frictional heat intensifies as the core depth increases. However, the rate of temperature rise decreases with increasing core depth; when the coring depth is constant, the frictional heat is proportional to the rotational speed. For example, at a depth of 140 m and a rotational speed of 120 r/min, the intensity of frictional heat generated by drilling is 2.21 ∗ 10E6J. Similarly, at 180 r/min, the strength is 2.28 ∗ 10E6J, and at 240 r/min, the strength reaches 3.65 ∗ 10E6J; Under certain conditions, core tube wall temperature will not rise indefinitely but will stabilize to a certain value.

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“…The validation is only shown for one load stage. Synchronizers with metallic friction materials such as molybdenum, 10,16,17,[20][21][22][23] brass, 15,19,24 and sinter 15 have often been investigated. Their thermal behavior is different from that of Carbon friction linings because their conductivity is significantly higher.…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior of a double cone synchronizer with carbon friction lining – verification and validation of 2D thermo-mechanical simulations by temperature measurements

Stockinger

Pflaum

Voelkel

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Synchronizers are important machine elements in gearboxes used in cars and trucks. A continuous demand for higher power density in transmissions increases the load requirements on these components. Modern Carbon friction linings can significantly improve the performance of synchronizers, but the low thermal conductivity of these materials results in high friction surface temperatures that can both damage the friction lining and lubricant. Using double cone synchronizers can further increase the power density, but the thermal loads as well. Understanding the thermal behavior of a synchronizer is important in order to improve its performance. This paper presents a 2D thermo-mechanical FEM model to calculate the temperature distribution in a double cone synchronizer. Extensive temperature measurements verify and validate the model. Practical guidelines for measuring temperatures in synchronizers are provided. The simulated temperatures correlate well with the measurements. Several parameters that influence the maximum temperature are analyzed, such as load parameters, different simulation approaches, position of temperature sensors, sensor time delay, and the influence of material properties. Measurements in combination with simulations demonstrate that cooling during the engagements and the friction of sliding blocks influence the temperature increase during an engagement.

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Friction Characteristics of Synchronization Process Based on Tribo‐Thermodynamics

Cited by 6 publications

References 20 publications

Friction Coefficient Compensation Control in Synchronizer Synchronization Process for Transmission

Friction Coefficient Compensation Control in Synchronizer Synchronization Process for Transmission

Intensity analysis of frictional heat source during core tube sampling and drilling

Thermal behavior of a double cone synchronizer with carbon friction lining – verification and validation of 2D thermo-mechanical simulations by temperature measurements

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