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Development of New Hybrid Transaxle for Mid-Size Sports Utility Vehicles

Toyota Motor Corporation-Seitaro Nobuyasu, Shigetsugu Iwata, Masabumi Nishigaya, Yoshiteru Hagino, Masatoshi Ito, Hiroshi Aihara
  • Technical Paper
  • 2020-01-0850
To be published on 2020-04-14 by SAE International in United States
Recently, automotive industries are active to develop electric in response to the energy conservation and environment problems. We developed the new hybrid transaxle for Mid-Size SUV to improve fuel efficiency and power performance. The transaxle was developed based on the new development strategy TNGA (Toyota New Global Architecture). By adopting technologies for transaxle overall length shortening, installation in same width of Mid-Size sedan engine compartment have been realized while improving the motor output. This paper will explain technologies about new motor structure and new mount structure for overall length shortening, and furthermore, noise reduction toward the mount structure.
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New Seven Speed DCT transaxle and effect of angular positioning of shaft in layout.

Satyam-Venture Engineering Services-Muralidhar Bhat
  • Technical Paper
  • 2020-01-0429
To be published on 2020-04-14 by SAE International in United States
This paper presents about new concept developed on 7 speed DCT transaxle for transverse application and a torque capacity of 200 Nm to 360 Nm. How current 6 speed DCT can modified to 7 speed with packaging benefit is discussed. In this paper, discussions are focused about torque carrying parts of transaxle only. Here only single countershaft is used giving lot of packaging advantage and at first glance layout looks like four speed layout, but it is compact layout. Further in this paper effect of angular position of shaft in layout is discussed.. Position of shafts in transaxle layout effects the stress, bending moment and displacement induced in shaft. Detailed study on effect of change in angle with respect to Bending moment, Stress in shaft, Cylindrical roller bearing (CRB) and Deep Groove Ball Bearing (DGBB) Bearing reaction force analysis, life calculations are computed.
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Inside Tremec's SUPERCAR DCT

Automotive Engineering: January/February 2020

Don Sherman
  • Magazine Article
  • 20AUTP02_04
Published 2020-01-01 by SAE International in United States

To polish the 2020 mid-engine Corvette's driving prowess, GM and Tremec engineers joined forces to create a new and better automated transaxle.

Explaining Corvette's move to one transmission for all buyers, global chief engineer Tadge Juechter notes, “Our customers began requesting a dual-clutch automatic transmission [DCT] several years ago. Following the introduction of the C7 Corvette in 2014, our take-rate for sticks [manual gearboxes] fell from 50 percent to less than 20 percent this year.” Searching the globe - read Europe - for a suitable DCT, Juechter's team found none with sufficient torque capacity to survive behind the lively LT2 6.2-L V8 planned for the all-new 2020 mid-engine edition of GM's reimagined sports car.

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Automatic Transmissions - Schematic Diagrams

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J647_201911
  • Current
Published 2019-11-19 by SAE International in United States
The following schematic diagrams reflect various methods of illustrating automotive transmission arrangements. These have been developed to facilitate a clear understanding of the functional interrelations of the gearing, clutches, hydrodynamic drive unit, and other transmission components. Two variations of transmission diagrams are used: in neutral (clutches not applied), and in gear. For illustrative purposes, some typical transmissions are shown.
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Derivation of Test Schedule for Jerk Test on Manual Gearbox Using Road Load Data

Tata Motors Ltd-Rahul Uttamani, Pradeep Navale, Vishveshvar Tendulkar, Hiral Patel
Published 2019-01-09 by SAE International in United States
Shock loads/Jerk is a major cause of gearbox failure which occurs during abusive driving condition. In passenger car torque spikes are experienced by the transmission during launch/sudden clutch release events on flat road or off-road. Whereas, in case of commercial vehicle torque spikes are generated while operation in mines and off-road application especially in tipper vehicles. Torque spikes experienced by the gearbox can lead to gear failure, gear slippage and structural failure of housing. Research has been done till now to improve the design of gearbox to address such failures. However, with increased focus on transmission downsizing and improved vehicle performance (by weight reduction and more powerful engine) it is necessary to have optimum design to meet transmission life. This paper discuss the test setup and methodology used to simulate the torque spikes on test bench. To develop the test procedure huge data was collected on commercial vehicles. Road load data was collected in various road mix conditions like mines, rough road, vehicle launch in 1st gear & Reverse gear on straight and gradient road…
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Development of New Hybrid Transaxle for Mid - Size Vehicle

Toyota Motor Corporation-Mitsutaka Matsumura, Kazuya Shiozaki, Nobuhito Mori
Published 2018-04-03 by SAE International in United States
The new P710 hybrid transaxle for a mid-size 2.5-liter class vehicle was developed based on the Toyota New Global Architecture (TNGA) design philosophy to achieve a range of desired performance objects. A smaller and lighter transaxle with low mechanical loss was realized by incorporating a new gear train structure and a downsized motor. The noise of the P710 transaxle was also reduced by adopting a new damper structure.
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eFlite Dedicated Hybrid Transmission for Chrysler Pacifica

FCA US LLC-Mike Pittel, Dale Martin
Published 2018-04-03 by SAE International in United States
Electrified powertrains will play a growing role in meeting global fuel consumption and CO2 requirements.In support of this, FCA US has developed its first dedicated hybrid transmission (the eFlite® transmission), used in the Chrysler Pacifica Hybrid. The Chrysler Pacifica is the industry’s first electrified minivan. [2]The new eFlite hybrid transmission architecture optimizes performance, fuel economy, mass, packaging and NVH. The transmission is an electrically variable FWD transaxle with an input split configuration and incorporates two electric motors, both capable of driving in EV mode. The lubrication and cooling system makes use of two pumps, one electrically operated and one mechanically driven.The Chrysler Pacifica has a 16kWh lithium ion battery and a 3.6-liter Pentastar® engine which offers total system power of 260 hp with 84 MPGe, 33 miles of all electric range and 566 miles total driving range. [2]This paper’s focus is on the eFlite transmission.
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Positioning for hybrid growth

Automotive Engineering: September 2017

Lindsay Brooke
  • Magazine Article
  • 17AUTP09_02
Published 2017-09-01 by SAE International in United States

BorgWarner's modular strategy provides OEMs optimal electrified-driveline flexibility.

Five years ago, few predicted the high level of technology fragmentation in powertrains, drivelines and fuels that exists in 2017. Nearly everyone now agrees, however, that hybridization of all types is essential to meeting the latest European, North American and Asian emissions regulations-and to connect to the long-term full-electric future. Whenever that comes.

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Automotive Transmission Terminology

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J645_201708
  • Current
Published 2017-08-25 by SAE International in United States
The following listed definitions are intended to establish terminology and criteria for describing the various kinds of automotive transmissions. A specific arrangement may be described by a combination of several of these definitions.
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Development of New Plug-In Hybrid Transaxle for Compact-Class Vehicles

NSK-Warner K.K.-Tomoyuki Miyazaki
Toyota Motor Corporation-Yosuke Suzuki, Akiko Nishimine, Shinichi Baba, Kenji Miyasaka, Michitaka Tsuchida, Hiroatsu Endo, Norihiro Yamamura
Published 2017-03-28 by SAE International in United States
To help respond to growing customer demand for environmentally friendly vehicles, a new transaxle for plug-in hybrid vehicles (PHVs) has been developed that achieves excellent fuel economy and ensures high performance when the PHV operates in electric vehicle (EV) mode. Under the basic concept of sharing a large number of parts with the transaxle in the all new Prius, the newly designed PHV transaxle was developed with the aim of enhancing EV power and range. To achieve our goal, the new transaxle uses a Dual Motor Drive System that operates the generator as a motor to supplement the existing motor. It also features an electrical oil pump (EOP) that improves cooling performance in EV mode. The developed transaxle helps to advance the PHV as a key next-generation environmentally friendly vehicle by maximizing the performance of the Toyota Hybrid System (THS) and achieving even better dynamic EV mode performance than the new Prius HV.
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