Mechanical Behaviour Simulation for Synchromesh Mechanism Improvements

Lovas, László; Play, Daniel; Márialigeti, János; Rigal, Jean-François

doi:10.1243/09544070d21604

Cited by 69 publications

(56 citation statements)

References 16 publications

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“…On the other hand, increasing the gearbox input shaft speed is possible through partial clutch engagement, usually necessary at downshifts. Since those features enable the synchronization without synchromesh [2], synchromesh mechanisms [3] may be replaced with simpler and mechanically more robust face dog clutches [4], realizing major advantages compared to synchromesh: longer life expectancy, higher transmittable torque and cost benefits.…”

Section: Face Dog Clutches In Modern Commercial Vehicle Gearboxesmentioning

confidence: 99%

Face dog clutch engagement at low mismatch speed

Bóka¹,

Márialigeti²,

Lovas³

et al. 2010

Per. Pol. Transp. Eng.

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Face dog clutches regain popularity in heavy duty AMT's. Though the reduction of the speed difference between the dogs is the key to a smooth gear shift, the excellent engaging capability is experienced to degrade at low mismatch speed and the outcome of the engagement process becomes uncertain. Using a simple mechanical model, that uncertainty is described and the probability of the successful engagement is given as a function of the initial mismatch speed. Results are validated through statistical evaluation of measurement data.Keywords heavy duty AMT · face dog clutch · mismatch speed · statistical evaluation Acknowledgement This work is connected to the scientific program of the " Development of quality-oriented and harmonized R+D+I strategy and functional model at BME" project. This project is supported by the New Hungary Development Plan (Project ID: TÁMOP-4.2.1/B-09/1/KMR-2010-0002).

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Section: Face Dog Clutches In Modern Commercial Vehicle Gearboxesmentioning

confidence: 99%

Face dog clutch engagement at low mismatch speed

Bóka¹,

Márialigeti²,

Lovas³

et al. 2010

Per. Pol. Transp. Eng.

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“…Different from synchronizer models in other literatures [1][2][3][4] where the sleeve can only move axially, the space motion of the sleeve in this article is considered by introducing the flexible shift fork and by applying the shift force on it, which is illustrated in Figure 10. Since the shift fork and the sleeve are connected by fixed joints, the sleeve can rotate slightly along the Y-axis and Z-axis besides its axial movement along X-axis.…”

Section: Modelling Of Shift Forcementioning

confidence: 99%

“…Displacement of the sleeve, relative velocity, cone torque, index torque and relative angle were obtained from the analytical model. Lovas et al 2 defined and studied the eight main operating phases of the Borg-Warner-type synchronizer with one conical surface clutch. The stick-slip and second bump were investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

“…Socin and Walters 18 also pointed out that clash occurred when the synchronizer was not energized or only partially energized. However, in the above studies about MT synchronizers, [1][2][3][4][5][6][7] the contact and friction phenomena between the synchronizer components were not deeply discussed and the contact forces were seldom shown, such as the contact forces on the engaged teeth. In this article, the major frictions and contacts between the synchronizer components are carefully modelled and analysed.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and simulation of synchronization and engagement for self-energizing synchronizer with multibody dynamics

Feng

Jiang

et al. 2017

Advances in Mechanical Engineering

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A multibody dynamic model of the self-energizing synchronizer in a 14-speed manual transmission gearbox is presented. While the contact forces between the engaged splines/teeth and friction torques between the synchro rings are hardly observed by conventional experiments, detailed contact and friction models in consideration of lubrication are established to simulate these contact/friction forces during shifting. The space motion of the sleeve is considered; thus, the differences in the contact forces between the engaged teeth can be simulated and observed. A pneumatic model is established to model the varying shift force acting on the synchronizer. An experiment is conducted for the self-energizing synchronizer to validate the presented synchronizer model. Moreover, to demonstrate the self-energizing function of the synchronizer, a synchronizer without self-energizing mechanism is modelled and compared with the original one.

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“…Clutch control systems for trucks with electro-pneumatic actuators are considered in the work (Langjord, 2011). The gearshift process and synchronization are discussed in detail in the works Lovas et al, (2006), Ivarsson et al, (2010), Junnarkar and Raibhole (2017). In some papers, the influence optimization of transmissions shift schedules on the traction performance and fuel consumption of vehicles is considered (Liao and Quail, 2011).…”

Section: Trends Of Development Of Manual Transmissionsmentioning

confidence: 99%

Multistage Mechanical Transmissions with Automatic Control for Advanced Trucks and Buses

Blokhin

Nedyalkov

Barakhtanov

et al. 2017

Acta Mechanica Et Automatica

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Abstract:The study considers the basic trends of development of modern mechanical transmissions of trucks and buses. It provides the developed various series of multispeed transmissions with automatic control and a number of transmissions from 6 to 16 for trucks and buses. The paper shows the basic parameters of the standard series of new transmissions received on the basis of innovative technical solutions. It provides the results of experimental studies of 16-speed transmissions on a special test stand and on the road as part of a truck transmission. Theoretical and experimental data on the gear change time are compared. Key words:Multistage Transmission, Pneumatic Actuator, Synchronization Process, Automatic Control, Command Control TRENDS OF DEVELOPMENT OF MANUAL TRANSMISSIONSThe transmissions of vehicles around the world most often have multispeed mechanical synchronized gearboxes with a friction clutch having such advantages as small weight and size, high reliability and service life, low cost, high energy performance as well as ease of maintenance and repair.In work (Crolla et al., 2009) the schemes and the general description of mechanical transmissions are presented, including with automated manual transmission (AMT), their advantages and disadvantages are described. It should be noted that at present AMT is widely used in vehicles, trucks, intercity buses and allterrain vehicles. Overview of the types of actuators and control systems of ATM is presented in the paper Ali et al. (2004). Electro-hydraulic (Lucente et al., 2007), electro-pneumatic (Jiang et al., 2011) and electro-mechanical (Kuroiwa et al., 2004, Karpukhin et al., 2015 actuators are the most used. Electro-hydraulic and electro-mechanical actuators are mainly used in cars and light commercial vehicles (Kuroiwa et al., 2004, Song et al., 2010. Medium and heavy-duty trucks, intercity buses and all-terrain vehicles have compressors that provide air compression and receivers -cylinders, which compressed air is stored, and that is why electro-pneumatic actuators are used there. As you know, the energy of compressed air is used to brake vehicles, control transmission, power take, remote tire inflation, etc. In this paper we consider AMT for trucks and buses. Clutch control systems for trucks with electro-pneumatic actuators are considered in the work (Langjord, 2011). The gearshift process and synchronization are discussed in detail in the works Lovas et al., (2006), Ivarsson et al., (2010), Junnarkar and Raibhole (2017). In some papers, the influence optimization of transmissions shift schedules on the traction performance and fuel consumption of vehicles is considered (Liao and Quail, 2011).For the majority of trucks, buses and road trains multispeed gearboxes are widely used. Their use ensures high traction and speed, reduced fuel consumption and improved environmental properties. Such gearboxes can be rationally used with automatic and command (semi-automatic) control (AMT), which allows us to realize the benefits of a wide range of gear rat...

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Mechanical Behaviour Simulation for Synchromesh Mechanism Improvements

Cited by 69 publications

References 16 publications

Face dog clutch engagement at low mismatch speed

Face dog clutch engagement at low mismatch speed

Modelling and simulation of synchronization and engagement for self-energizing synchronizer with multibody dynamics

Multistage Mechanical Transmissions with Automatic Control for Advanced Trucks and Buses

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