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Jang, Jae-Duk
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Optimum Design of Front Cover Taper Angle in Torque Converter by Finite Element Method

Korea Powertrain Co., Ltd.-Wan Choi, Jae-Hoon Song, Hideaki Kosuge, Jae-Duk Jang, In-sik Joo
Published 2007-08-05 by SAE International in United States
Since torque converter slip in the coupling range has long been recognized as a source of power loss, numerous lock-up clutch system of torque converter has been investigated. The lock-up clutch in the torque converter improves fuel economy by eliminating torque converter slip at high speed range. Besides, lock-up function at low speed is necessary for better fuel economy. But, when the lock-up is engaged at low speed, NVH problem takes place due to shudder, friction characteristics, and so on. In addition, for more frequent lock-up operations, we need more durable torque converter lock-up clutch system. Front cover taper angle in the torque converter, friction material, contact surface roughness, and damper characteristics are important design parameters for improving NVH and drivability. Particularly, front cover taper angle in the torque converter should be determined on the basis of the surface pressure between front cover and friction Material. In this study the pressure distribution of the contact surface is investigated by finite element method. Moreover, we propose design optimization method for torque converter taper angle.
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Fatigue Life Analysis of Automotive V-belt Pulley

Inje University-Beomkeun Kim, Yongsu Kim
Korea Powertrain Co., Ltd.-Jae-Duk Jang
Published 2007-08-05 by SAE International in United States
Fatigue life of a V-belt pulley, which is commonly used in automotive powertrain to transfer power to other parts, is predicted based on damage analysis by finite element analysis (FEA). Load conditions on pulley are analyzed by considering interactions among the pulley, V belt, bracket and bolts. Both normal force and traction force on the contact surfaces between the pulley and V belt were calculated. Assembly load due to the tightening of the bolts as well as operation load was considered to describe the actual load conditions in durability test. Static analysis at initial position of the pulley after assembly was performed with given load conditions. As the pulley rotated every ten degrees, consecutive static analyses were followed to find out the stress history of the pulley during operation. Using stress history data calculated from FE analysis, damage over one rotation of pulley was calculated and fatigue life, number of rotation to failure, was estimated. Durability test for the pulley used in the analysis was followed to verify the analysis results. Comparison between analysis and…
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Development of Extremely Flat Torque Converter for Automatic Transmission Systems

Korea Powertrain Co., Ltd.-Dong-Jin Kim, Hideaki Kosuge, Jae-Duk Jang, In-Sik Joo
  • Technical Paper
  • 2006-05-0327
Published 2006-10-22 by Society of Automotive Engineers of Japan in Japan
With the reduction in size and weight of automatic transmissions, the allowable size of Torque Converter is also decreasing. In contrast, suitable performance for more powerful engines and increased capacity for absorbing vibration are also required. To satisfy these needs of the market, an Extremely Flat Torque Converter (EFTC) with high capacity fluid performance and Long Travel Damper System (LTDS) have been developed. To use the LTDS, the size of the blades, which is the real factor of power transmission, has been decreased by 40% as compared to the latest ultra-flat models, and the flat ratio (FR) of the blades is 35% less than conventional models. In order to obtain the desired high fluid performance from this extremely flat torque, the core shape turns out to be a key factor, and the controllability of outgoing flow angle influenced by the Pitch/Chord ratio of the reactor blades is also important. Fluid performance is designed by a sensitivity study using the well-known, one-dimensional analysis method and detailed investigation with three-dimensional numerical simulation, and is verified by performance…

Performance Development for Hydraulic Elements of Hyundai Automotive Automatic Transmission

Power Train R&D Center, Hyundai Motor Company, South Korea-Gi-Woo Kim, Jae-In Park, Jae-Duk Jang
  • Technical Paper
  • 2000-05-0081
Published 2000-06-12 by Society of Automotive Engineers of Korea in South Korea
As a good shift quality and a low fuel consumption are increasingly demanded in a passenger automotive automatic transmission (in short: A/T), various new performance studies of automotive automatic transmissions have lately been introduced. In this paper, we considered the dynamic characteristics of pressure observed in hydraulic elements of automatic transmission, such as an oil pump, a pressure control valve, and a torque converter. The suppression of discharge pressure ripple using a notch is first examined in a trochoidal gear type oil pump. The improvement of hydraulic stability of clutch control pressure is also investigated on the basis of the experimental and simulation results. And, the CFD analysis shows that the key factors affecting performance of the torque converter are angles and shape of blades modified to reduce pressure loss. From these results, we may conclude that the characteristics of hydraulic pressure are primarily correlated with the performance of automatic transmission.

Development of 4 Speed Electronically Controlled New Automatic Transmission for FWD

Hyundai Motor Company, South Korea-Jong-Sun Oh, Jun-Eui Kwon, Jin-Soo Lee, Jae-Duk Jang, Hyuk-Bin Kwon
  • Technical Paper
  • 2000-05-0024
Published 2000-06-12 by Society of Automotive Engineers of Korea in South Korea
Hyundai Motor Company has developed a new four speed automatic transaxle - named A4AF3 - with electronic control for front wheel drive (FWD) passenger cars. This A4AF3 transaxle has realized good adaptability to driving condition by electronic control of all clutches. And the A4AF3 has achieved good shift quality and response and endurance reliability and also has adopted new shift schedule control strategy for good drivability. This paper shows the major features and performances of A4AF3.