Analysis of Temperature Field on Combining Friction Discs of Wet Clutch
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Because of overheat and over wear, the distortion and invalidation will be produced easily in combining friction discs of wet clutch of heavy vehicle transmission system. So the paper studies the sliding friction force of a pair of steel and friction disc, calculates the heat flow density, obtains the heat exchange function with axial symmetry, and establishes the finite element model of temperature field. And then the transient heat field simulation is analyzed, and temperature field distribution curves of combining pairs are obtained. Thus the connection is found between time and temperature along radial and axial direction, and temperature field characteristics are obtained with touch press, relative speed, and sliding time.Keywords:
Distortion (music)
Transient (computer programming)
Torque converter
Constructive
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A usual two-way clutch cannot rotate at high speed. Therefore, it is not suitable for a device that needs to rotate at high speed. In this paper, we propose a two-way clutch mechanism that can rotate at high speed. A one-way clutch can rotate at high speed in comparison with a two-way clutch. A two-way clutch restricts the transmission-direction of the torque only from the input shaft to the output shaft. The one-way clutch restricts the rotation-direction of a shaft in one direction. In the proposed mechanism, a planetary gear is sandwiched between two one-way clutches. When the rotation direction is changed, the planetary gear moves to switch the meshed one-way clutch. As a result, the mechanism works just like a two-way clutch mechanism. We experimentally confirmed that the mechanism works as expected.
Torque converter
Drive shaft
Gear train
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clutch plate is one of the important part in the power transmission systems. Good design of clutch provides better engine performance. Clutch is device which is used to engage or disengage of gears and it transfers the rotary motion of one shaft to the other shaft when desired. In automobiles friction clutches are widely used in power transmission applications. To transmit maximum torque in friction clutches selection of the friction material is one of the important tasks. In this thesis a model of Piaggio Ape clutch plate has been generated in Pro-E Cre0-5 and then imported in ANSYS for power transmission applications. We have conducted structural analysis by varying the friction surfaces material and keeping base material aluminium same. By seeing the results, Comparison is done for both materials to validate better lining material for Piaggio Ape clutch plate by doing analysis on clutch with help of ANSYS software for find out which material is best for the lining of friction surfaces. Keywords— cork, cr2m, cre0-5 , Kevlar, Piaggio ape , sa80, sa92.....
Power transmission
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It is known that the shift processes of the four types of clutch-to-clutch shifts can theoretically be divided into two phases which are torque phase and inertia phase, but the execution orders are different. Two virtual clutch controllers are designed with the same eight states which include all control processes for these shifts. An equivalent method is proposed so that AT can be controlled just like DCT by adopting the torque ratios of oncoming clutch and offgoing clutch of each gear. The powertrain system model and the shift controller are established on Matlab/Simulink platform. The clutch-to-clutch shift processes have been studied based on the virtual clutch controller by software-in-the-loop simulations. Some typical problems in the clutch-to-clutch shift control are discussed and several control methods are compared to solve these problems.
Powertrain
Torque converter
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Wet clutches in an automatic transmission enable the transmission of the engine power by the frictional torque experienced and noted between disk and plates. Since the clutch frictional torque considerably affects the shift quality of an automatic transmission as well as the durability of the machinery, its friction characteristics must be carefully examined to meet the design requirements. The SAE No. 2 friction test machine is a well-known standard to evaluate mainly the friction characteristics of plate clutches along with the required automatic transmission fluids. This paper reviews the experimental analysis of the wet clutch friction characteristics by using the exclusively developed clutch test machine which is capable of controlling the clutch test procedure, in accordance with the applicable test standard and processing of the experimental data automatically. As the clutch test machine is designed for the accommodation of dual clutches which is applied to the real transmission, it can evaluate not only the clutch friction characteristics, but also an actuation performance of a measured clutch piston. In respect to friction characteristics involving dynamic friction coefficients, the energy absorbed in a clutch disk and the recorded temperatures of clutch plates during braking actions and procedures are also investigated. Additionally, the change of friction coefficients by the use of the repeated clutch application is also observed with the endurance test functions of an accurately calibrated and dedicated clutch test machine.
Automatic transmission
Torque converter
Piston (optics)
Friction torque
Manual transmission
Power transmission
Friction loss
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Nowadays,the car industry development rapidly and the clutch is the mostly important device which determine the performance of the car.The thesis calculate the basic parameter of the clutch under the condition of giving the engine's output torque,rotate speed and the speed of the car.At the same time the analysis of various structural parts designed to improve the clutch and place the each part of the clutch reasonably and optimize the clutch of the car.
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Clutch shift control is critical for efficient and high-performance transmission designs, including automatic, dual clutch, and hybrid transmissions. To ensure a smooth clutch to clutch shift, appropriate controls for two consecutive processes are critical. One is the precise coordination between the on-coming and off-going clutches, which requires the on-coming clutch to be filled and ready for engagement at the predetermined time (clutch fill). The other is the proper torque control during clutch engagement. In this paper, we will investigate the closed-loop "wet" clutch control enabled by a pressure sensor in the clutch chamber. The main challenges of the pressure-based "wet" clutch control lie in the complex nonlinear dynamics due to the interactions between the fluid and the mechanical systems, the ON/OFF behavior of the clutch assembly, the time-varying clutch loading condition, the required short time duration for a precise and robust clutch shift, and the lack of the displacement information. To enable precise and robust pressure-based control, this paper focuses on the following three aspects. First, a clutch dynamic model is constructed and validated, which precisely captures the system dynamics in a wide pressure range. Second, a sliding-mode controller is designed to achieve robust pressure control while avoiding the chattering effect. Finally, an observer is constructed to estimate the clutch piston motion, which is not only a necessary term in the nonlinear controller design but also a diagnosis tool for the clutch fill process. To validate the proposed methods, a transmission clutch fixture has been designed and built in the laboratory. The experimental results demonstrate the effectiveness and robustness of the proposed controller and observer.
Torque converter
Pressure Control
Automatic transmission
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Citations (110)
This study proposes a new design for a friction clutch actuator using the self-energizing principle for vehicle applications such that the power consumption for clutch control is significantly reduced. The self-energizing effect can be created by simply adding wedge structures to a conventional clutch system, and it assists in significantly reducing the actuation energy of the clutch with little additional cost. In this paper, a mathematical model of the clutch actuation system is derived on the basis of static force analyses with particular emphasis on the torque amplification factor due to the self-energizing effect. The slope angles of the wedges in the proposed clutch actuator are determined in order that the clutch system ensures appropriate torque amplification while considering various factors such as the variations in the friction coefficient and the return spring force. In addition, model-based analyses of the new clutch actuator system are performed in order to predict the dynamic effects of the self-energizing mechanism on the system, particularly for the clutch engagement process. The feasibility of the proposed clutch design and its high energy efficiency are verified experimentally using three prototypes with different slope angles.
Torque converter
Wedge (geometry)
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