DUAL CLUTCH TRANSMISSION WITH MODIFIABLE GEAR SPEEDS AND USE OF THE TRANSMISSION FOR AT LEAST TWO TRANSMISSION VARIATIONS

• US 20090120221A1
• Filed: 11/07/2008
• Published: 05/14/2009
• Est. Priority Date: 11/14/2007
• Status: Active Grant

• Current Assignee: Getrag Ford Transmissions GmbH
• Original Assignee: Getrag Ford Transmissions GmbH
• Inventors: Chazotte, Jean-Pierre
• Granted Patent: US 8,307,729 B2
• Time in Patent Office: Days
• US Class Current: 74/330
• CPC Class Codes: F16H 2003/0931 each countershaft having an output gear meshing with a single common gear on the output shaft
• CPC Class Codes: F16H 2057/0335 Series transmissions of modular design, e.g. providing for different transmission ratios or power ranges
• CPC Class Codes: F16H 2200/0056 the gear ratios comprising seven forward speeds
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/093 with two or more countershafts
• CPC Class Codes: F16H 57/033 Series gearboxes, e.g. gearboxes based on the same design being available in different sizes or gearboxes using a combination of several standardised units
• CPC Class Codes: Y10T 74/19228 Multiple concentric clutch shafts
• CPC Class Codes: Y10T 74/19233 Plurality of counter shafts

Abstract

A modifiable dual clutch transmission is suggested allowing to be manufactured as two transmission variations having an interdependence of fixed wheels and loose wheels that remains at the same position for both variations while the loose wheels belonging to this interdependence are provided with different diameters for providing different transmission ratios. At least one of the loose wheels in that interdependence is correlated to a different forward gear in one transmission variation compared to the other transmission variation. In both transmission variations the loose wheels relating to the respective interdependences are correlated only to even numbered forward gears or to odd numbered forward gears, preserving the advantage of the dual clutch transmission to shift between two adjacent forward gears without interruption in the tractive power.

Claims

1. Use of a dual clutch transmission for motor vehicles for at least two transmission variations comprising different transmission ratio increments, wherein the dual clutch transmission comprises:

a first input shaft with a first group of fixed wheels;

a second input shaft with a second group of fixed wheels; and

a first intermediate shaft as well as a second intermediate shaft provided with loose wheels thereon;

the loose wheels provided on the intermediate shafts are engaged by correlating fixed wheels that are provided on the input shafts;

a loose wheel that is engaged by a fixed wheel from the first group of fixed wheels is assigned to an odd numbered forward gear;

a loose wheel that is engaged by a fixed wheel from the second group of fixed wheels is assigned to an even numbered forward gear;

at least two loose wheels are engaged by one and the same fixed wheel from the first group or the second group of fixed wheels, wherein an interdependence is created; and

the loose wheels can be switched by gear shift clutches such as to be connected in a non-rotatable manner with the first or the second intermediate shaft;

said use comprising the steps of;

maintaining for the two transmission variations the interdependence at the same position;

providing for this interdependence loose wheels having different diameters for providing different transmission ratios,

correlating at least one of the loose wheels in that interdependence to a different forward gear in one transmission variation compared to the other transmission variation; and

correlating in both transmission variations the loose wheels relating to the respective interdependences only to even numbered forward gears or to odd numbered forward gears.

2. Use according to claim 1, further comprising the steps of providing one transmission variation with an interdependence with loose wheels correlating to a third forward gear and a fifth forward gear, respectively, and providing another transmission variation with an interdependence with loose wheels correlating to a fifth forward gear and a seventh forward gear, respectively.

3. Use according to claim 1, further comprising the step of providing both transmission variations with seven forward gears.

4. Use according to claim 1, further comprising the step of providing a further interdependence with further loose wheels correlating to even numbered forward gears.

5. Use according to claim 4, further comprising the step of correlating the loose wheels of the further interdependence to a fourth forward gear and a sixth forward gear.

6. Use according to claim 1, further comprising the steps of providing one transmission variation with an interdependence with loose wheels that correlate to a fourth forward gear and sixth forward gear, respectively, and providing another transmission variation comprising an interdependence with loose wheels that correlate to a sixth forward gear and an eighth forward gear, respectively.

7. Use according to claim 6, further comprising the step of providing a further interdependence with further loose wheels correlating to a third forward gear and a fifth forward gear, respectively, or in the alternative to a fifth forward gear and an eighth forward gear, respectively.

8. Dual clutch transmission for motor vehicles with modifiable gear speed, modifiable to at least two transmission variations comprising substantially the same design but different transmission ratio increments, wherein the dual clutch transmission comprises:

a first input shaft with a first group of fixed wheels;

a second input shaft with a second group of fixed wheels; and

a first intermediate shaft as well as a second intermediate shaft provided with loose wheels thereon;

wherein

the loose wheels provided on the intermediate shafts are engaged by correlating fixed wheels that are provided on the input shafts;

a loose wheel that is engaged by a fixed wheel from the first group of fixed wheels is assigned to an odd numbered forward gear;

a loose wheel that is engaged by a fixed wheel from the second group of fixed wheels is assigned to an even numbered forward gear;

at least two loose wheels are engaged by one and the same fixed wheel from the first group or the second group of fixed wheels, wherein an interdependence is created; and

the loose wheels can be switched by gear shift clutches such as to be connected in a non-rotatable manner with the first or the second intermediate shaft;

wherein

for the two transmission variations the interdependence remains at the same position while the loose wheels belonging to this interdependence are provided with different diameters for providing different transmission ratios;

at least one of the loose wheels in that interdependence is correlated to a different forward gear in one transmission variation compared to the other transmission variation, and

in both transmission variations the loose wheels relating to the respective interdependences are correlated only to even numbered forward gears or to odd numbered forward gears.

9. Dual clutch transmission according to claim 8, wherein one transmission variation comprises an interdependence with loose wheels correlating to a third forward gear and a fifth forward gear, respectively, and that another transmission variation comprises an interdependence with loose wheels correlating to a fifth forward gear and a seventh forward gear, respectively.

10. Dual clutch transmission according to claim 8, wherein both transmission variations comprise seven forward gears.

11. Dual clutch transmission according to claim 8, wherein a further interdependence with further loose wheels is provided that correlate to even numbered forward gears.

12. Dual clutch transmission according to claim 11, wherein the loose wheels of the further interdependence correlate to a fourth forward gear and a sixth forward gear.

13. Dual clutch transmission according to claim 8, wherein one transmission variation comprises an interdependence with loose wheels that correlate to a fourth forward gear and sixth forward gear, respectively, and that another transmission variation comprises an interdependence with loose wheels that correlate to a sixth forward gear and an eighth forward gear, respectively.

14. Dual clutch transmission according to claim 13, wherein a further interdependence with further loose wheels is provided correlating to a third forward gear and a fifth forward gear, respectively, or in the alternative to a fifth forward gear and an eighth forward gear, respectively.