A double intermediate shaft dct structure and its gear ratio calculation method

Abstract

The invention relates to a double-intermediate-shaft DCT (Dual Clutch Transmission) structure and a computing method of a gear transmission ratio thereof. The double-intermediate-shaft DCT structure comprises dual clutches, a solid input shaft and a hollow input shaft, wherein one ends of the solid input shaft and the hollow input shaft which are coaxially arranged are connected with the dual clutches, and a normally engaged gear is respectively arranged at each of the other end of the solid input shaft and the other end of the hollow input shaft; the hollow input shaft is matched with an even-number gear intermediate shaft through a normally engaged gear set, and the even-number gear intermediate shaft is matched with an output shaft through a gear set; the solid input shaft is matched with an odd-number gear intermediate shaft through the normally engaged gear set, the odd-number gear intermediate shaft is matched with the output shaft through a gear set; and the tail end of the solid input shaft is matched with the head end of the output shaft sequentially through an embedded bearing and five-gear seven-gear synchronizers, and the total transmission ratios of all the gears are distributed in a geometric progression manner from the seventh gear to the first gear. The double-intermediate-shaft DCT structure not only achieves a structure of four synchronizers and eight speed-variable gears, but also is compact in layout and shortened in lengths of the input shafts.

Description

technical field [0001] The invention relates to an automobile gearbox, in particular to a double countershaft DCT structure and a calculation method for gear transmission ratios, which are particularly suitable for improving the mechanical strength of the input shaft and reducing the layout space of the gearbox. Background technique [0002] At present, the shafting structure of gearboxes is divided into two-shaft gearboxes, three-shaft gearboxes, multi-shaft gearboxes, etc. A dual-clutch gearbox, on the other hand, contains two clutches and requires more shafts to meet the shifting requirements. Ordinary clutch shifting, when the clutch is disengaged and combined, the output power will be interrupted and combined to produce a speed difference, which will cause impact on the car and affect the comfort of the ride; while the dual clutch is used alternately by two clutches, one is separated The combination of one and the other at the same time will not cause the problem of im...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of poor mechanical strength caused by too long input shaft and unreasonable arrangement of internal gears in the gearbox in the prior art, and provide a dual-purpose gearbox with a short input shaft that improves mechanical strength and rationally arranges the internal gears of the gearbox. Intermediate Shaft DCT Structure and Calculation Method of Gear Transmission Ratio

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