Lotus plans dual-clutch gearbox

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Lotus dual-clutch gearbox

Lotus has submitted a patent application for a more compact, lighter, and less complex dual-clutch transmission.

While the patent application was submitted by Lotus Cars rather than Lotus Engineering, sources told Autocar today that the transmission is in fact being developed by Lotus Engineering.

Consequently, Lotus plans to sell the technology to its Lotus Engineering clients as well as fit the gearbox in future Lotus models. This explains why patent applications for both FWD and RWD configurations have been submitted.

The unit shown in the patent application is an eight-speed unit with seven forward gears and a reverse gear.

While a production date remains unconfirmed, the lightweight nature of the gearbox will make it a perfect match for the next Elise and broaden that model’s appeal.

Lotus patent abstract

Abstract of WO 2009156744 (A1)
With reference to Figure 2, the present invention provides a transmission unit comprising: a first set of shaft-mounted input gears (206, 207, 208, 209) each of which meshes with a respective one of a first set of shaft-mounted output gears (220, 221, 222, 223); a second set of shaft- mounted input gears (210, 211, 212, 213) each of which meshes with a respective one of a second set of shaft- mounted output gears (224, 225, 226, 227); a first clutch (215) associated with the first set of input gears (206, 207, 208, 209); and a second clutch (216) associated with the second set of input gears and the second set of output gears (210, 211, 212, 213). At least one of each meshed pair of input and output gears can freely rotate on the shaft on which the gear is mounted and a gear ratio selection mechanism (231) is provided to select a gear ratio by locking a freely rotatable gear to the shaft on which the gear is mounted. In use of ‘the transmission unit (200) either the first clutch (215) is engaged and the second clutch disengaged (216) and drive is transmitted via a selected pair of the first set of input and output gears or the second clutch (216) is engaged and the first clutch (215) disengaged and drive is transmitted via a selected pair of the second set of input and output gears.

[Source: @RacingPuma, Autocar]

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  • raffi

    will it have pdk reliability and precsion will it be strong launch control

  • raffi

    how will it hold up with extreme driving and power

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