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.”
Download JNTU MECH 4-1 (2012) First Mid Online Bits in PDF Subscribe to feed through email,not to miss any updates. Download JNTU MECH 4-1 (2012) First Mid Online Bits subject wise 1. OR 2. DBMS [13.08.12] 3. FEM 4. ICS 5. ROBOTICS 6. PPE * We are not responsible of any consequences
Dash kits Dash kit gives a great luxury look to the interior part of the cars which can be seen in BMW series. As you can find the high quality plastic material used for the dash board kit parts having a real look. There are different types of series of models with chosen colour like BMW 1 series wood Grain from the most reputed names in business. Most of the manufacturers provide the better choice for all the finished products. Some are authentic Wood veneers, OEM Factory-Match Woods, Real carbon Fibre and more extensive dash kits. Wood Veneers is the better options which is having the good test time and enact a precise OEM fitment. These are available in in version of the models according to the year and series. Grills In a basic point grill is like a network or a mesh which not only give protection the vehicle but also give a stylish look and but also gives a protection from the external hazards. Generally these are made up of stainless steel and other alloy like BILLET GRILLES, T-R
When you adopt advanced technology gadgets in your life, then we also need to understand the necessity of maintenance and security of the device. There are several things that need to be done in order to provide the best protection to your device but if you just understand the basic requirement of your smart gadget then maintenance and security management procedure will not be very hard for you. Smartwatches are wonderful gadget choices for those who are hoping to consolidate wearable appeal with next-level device functionality. They track your health, help you to remember your meetings, and—normally—tell the time. However, just like basically any other gadget nowadays, there are security concerns that you should be aware of. After some research on the smartwatch security concerns, an educator at the Stevens Institute of Technology found out that it was quite possible for programmers and hackers to get unauthorized access and steal the ATM PIN from smartwatches. All they n
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