ZF launches 8-speed dual clutch transmission for sports vehicles

Parts manufacturer collaborates with Porsche to develop a modular hybrid transmission kit

ZF launches 8-speed dual clutch transmission for sports vehicles
ZF's eight-speed dual clutch transmission.

The new sports transmission, for rear-wheel and all-wheel drives, boasts rapid shift times, high levels of efficiency and flexibility.

ZF said that a major development goal was to make electric power an option for this transmission: thanks to a new gear set design, it was possible to integrate a 100 kW hybrid module without increasing the length of the transmission, as compared to the current 7DT sports transmission.

Another goal was an integrated all-wheel distribution option, driving the front axle in the most fuel-efficient manner possible using a hang-on clutch.

The new transmission is manufactured at the Brandenburg plant and volume production of vehicles featuring the 8DT began with the Porsche Panamera.

Dr. Jürgen Greiner, head of development for passenger car transmissions at ZF Friedrichshafen AG, said: “In the new 8DT sports transmission, we combine blazing-fast shifts, a great level of efficiency and all-electric driving with the flexibility to integrate different variants within a tight installation space – without compromise.”

“The first six gears with their compact gradation optimizes acceleration to top speed. In contrast, the seventh and eighth gears are configured as overdrive, so they significantly decrease rpm and fuel consumption, even when not using electric power.

The new duel clutch transmission is available for front-longitudinal configuration in four different variants (standard, all-wheel drive, hybrid, all-wheel hybrid) in three torque classes, to a maximum of 1,000 Nm.

The torque class is defined by the configuration variety of the dual-clutch modules, with the basic transmission and gear set always remaining the same.

ZF has customized an already compact hybrid module for the optional variant of the new 8-speed dual clutch transmission.

It includes a torsional damper, a separating clutch with actuators as well as the electric motor, and it can be integrated directly into the clutch bell housing.

In terms of mechanics, the lubrication system consists of two pumps which are coupled via the hydraulic control unit.

The software, cool oil flow management (COFM), which is stored on the transmission control unit, ensures the coordination and regulation of these complex processes.

Depending on the driving conditions, it continuously determines the present volume flow requirement for all transmission components.

Based on this, COFM sets the oil flow as needed and utilizes both pumps to supply the required amount.

In addition to this, COFM determines the cooling requirements of the gearing for each gear, specifically, and constantly provides the required oil flow for each sub-section of the transmission engaged in power transmission at that point in time.

To find out about ZF Aftermarket, follow the ‘more details’ link below.

Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>


The reCAPTCHA verification period has expired. Please reload the page.

Have your say!

0 0

Lost Password

Please enter your username or email address. You will receive a link to create a new password via email.