Multi-speed transmission changes gear without interrupting torque
Who
Transmission specialist Zeroshift has devised a multi-speed gearbox for electric vehicles (EVs) that needs no clutch: a damper inside the gear hubs and electronic control of the motor make ratio changes seamless. Having more than one gear ratio and the ability to shift without interrupting torque means the motor runs at higher efficiency, extending range and batteries’ life expectancy by up to 10%.
Technology
Development of the concept is under way using Zeroshift’s proprietary gear-shifting system. The innovation could enable manufacturers to downsize EVs’ electric motors, keeping them running longer at the medium loads and speeds where peak efficiency of more than 95% is possible. For drivers, that could mean more performance, greater range and longer lasting batteries.
Zeroshift’s concept prevents any torque interruptions during ratio changes and does not require a clutch, issues that have so far deterred EV manufacturers from fitting multi-speed gearboxes. Current EVs instead use a single-speed transmission, but the motor then spends more of its time outside of its optimum efficiency range.
The improved efficiency offered by Zeroshift’s concept could also extend EVs’ in-service battery life. Current range limitations often lead EV drivers to drain the cells to the maximum allowable level of discharge in order to reach their destination; the deeper cycling affects batteries’ life expectancy. Improving the motor efficiency uses less of the energy stored for a given journey, easing the discharge-recharge cycles and reducing recharge time.
The company’s technology replaces the synchromesh in a conventional manual gearbox with paired interlocking rings that change ratios without interrupting the torque. To provide the required levels of shift refinement, Zeroshift’s concept uses electronic control of the electric motor or motors to match the shaft speeds and an integrated passive damper system within the drive hub to isolate any vibrations.
The combination of sealed pockets of silicone fluid and mechanical compression springs make shifts virtually unnoticeable to occupants.
Application
Zeroshift is developing its compact transmission with several vehicle manufacturers. The company is also working with consultancy firms and manufacturers on the integration of its technology into the next generation of seamless layshaft automatic transmissions for hybrid medium-duty trucks, buses and passenger cars.
Bill Martin, Zeroshift’s managing director, says: “Our studies suggest that by using a compact, multi-speed transmission and a smaller electric motor, manufacturers can gain an operating efficiency of up to 10%. You can use that 10% to improve EVs’ range or reduce the size, weight and cost of battery packs.
“The benefits of Zeroshift’s transmission would be greatest for electric delivery vehicles, where the compromises in efficiency are greatest. To be able to pull away fully laden on hills requires low gearing, but the motor then runs too fast and too inefficiently on the highway.”
Albert Einstein was born at ulm in warltemberg, Germany on March 14th 1879, six weeks later the family moved to Munich where he later on began his schooling at the Luitpold Gymnasium. Later they moved to Italy and Albert continued his education at Aran, Switzerland and in 1896 he entered the Swiss Federal Polutechnic School in Zurich to be trained as a teacher in physics and maths. In 1901, the year he gained his diploma, he acquired Swiss citizenship and as he was unable to find a teaching post, he accepted a position as technical assistant in the Swiss patent office. In 1905, he obtained his doctor’s degree. During his story at the patent office and in his spare time he produced much of his remarkable work and in 1908, he was approved private dozens in Barne. in 1909, he became professor extra ordinary at Zurich in 1911 professor of theoretical physics at Prague returning to Zurich in the following years to fill a similar post. In 1914, he was appointed as director of the Kaiser Wilh...
Click here to use Google Payment Services In today's rapidly evolving digital landscape, the way we handle financial transactions has undergone a profound transformation. One of the prominent players in this revolution is Google Pay, a digital wallet platform developed by Google. Since its inception, Google Pay has revolutionized the way individuals and businesses send, receive, and manage money. Let's delve deeper into the evolution and impact of Google Pay. ### The Birth of Google Pay: Google Pay emerged from the merger of two previous Google services: Android Pay and Google Wallet. Android Pay, launched in 2015, focused on in-store and online payments, leveraging NFC (Near Field Communication) technology to facilitate transactions. On the other hand, Google Wallet, introduced in 2011, primarily served as a peer-to-peer payment platform. ### Streamlining Transactions: With the integration of Android Pay and Google Wallet, Google Pay became a comprehensive solution, offering u...
Money has become one of the important necessity in our every day life. Investment and Its planning are widely used these days. The terms saving, inflation and Investment are important and have relation with each other. We are need financial planning required to start in your 20s immediately you find your first job. Some of the key things to be considered for the life time investment planning in your career that will be helping you and your family are as follows: Medical Insurance Personal Accident Insurance Home Insurance Critical Illness plan Children Future Planning Retirement Planning Senior Citizens Saving Scheme Asset Allocation Investing in Bank Deposits Flexi Deposits Investing in PPF (Public Provident Fund) Investing in NSC (National Saving Certificate) Post Office Monthly Income Scheme Investing in Mutual Funds National Pension Scheme Systematic Investment Plan (SIP) Investing in Annuity Investing in Shares Investing in Public Issued IPOs Investing in Gold and Silver Inve...
data. It is a factual and beneficial article for us. wholesale Hot pressed silicone sheet Thankful to you for sharing an article like this.
ReplyDelete