| United States Patent | 7,249,532 |
| Ruedle | July 31, 2007 |
Double clutch transmission
In a double clutch transmission, particularly for front wheel drive cars with transversely mounted engines, the power path for the reverse speed extends through the same path as that for the second forward speed, both using the same input clutch, while the power path for the first forward speed extends through the other input clutch of the double clutch so that shifting between the reverse and first speeds can be accomplished under engine power.
| Inventors: | Ruedle; Harald (Stuttgart, DE) |
| Assignee: | DaimlerChrysler A.G. (Stuttgart, DE) |
| Appl. No.: | 11/221,389 |
| Filed: | September 7, 2005 |
| Sep 11, 1920 [DE] | 10 2004 043 939 | |||
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| Current U.S. Class: | 74/330 ; 74/331 |
| Current International Class: | F16H 3/08 (20060101) |
| Field of Search: | 74/330,331,606R |
| 6055879 | May 2000 | Abe et al. | |||
| 6755090 | June 2004 | Ima | |||
| 6856880 | February 2005 | Shimaguchi | |||
| |
| 196 24 857 | Jan., 1997 | DE | |||
| 103 35 262 | Mar., 2005 | DE | |||
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Attorney, Agent or Firm:
What is claimed is:
1. A double clutch transmission, particularly for front wheel drive cars, including a central input shaft (11) and a hollow input shaft (12) through which the central input shaft (11) extends, a first and a second secondary transmission shaft (22, 24) arranged in spaced relationship parallel to said input shafts (11, 12), first and second clutches (K1, K2) mounted on the central and the hollow input shafts (11, 12) respectively, for switching the power transfer to said transmission between the central and the hollow input shafts (11, 12) for transmitting the power via different sets of gears of the transmission forming various transmission speeds, said speeds including a reverse speed (R) with a gear (32) rotatably supported via a gear sleeve (34) on said first secondary shaft (22) and being in engagement with a gear (31) associated with a low forward speed (V1), said gear sleeve (34) being rotatably supported on said first secondary transmission shaft (22) and arranged in the power flux of another forward speed (V2) and connected to a sleeve gear (21) assigned to this forward speed (V2).
2. A double clutch transmission according to claim 1, wherein said low forward speed is the first forward speed (V1).
3. A double clutch transmission according to claim 2, wherein said gear sleeve (34) and said sleeve gear (21) assigned to the first forward speed are coupled without circumferential play.
4. A double clutch transmission according to claim 1, wherein said gear sleeve (34) and said sleeve gear (21) assigned to the first forward speed are formed as a single part.
5. A double clutch transmission according to claim 1, the another forward speed (V2) is the second speed.
6. A double clutch transmission according to claim 5, wherein the sleeve gear (21) assigned to the another forward speed (V2) is in engagement with a gear (15) which is mounted on one of the two input shafts (12) for rotation therewith.
7. A double clutch transmission according to claim 6, wherein the concentric input shafts (11, 12) are supported relative to each other by antifriction bearings and the central input shaft (11) is provided at its end remote from the clutches (K1, K2) with a central bore for supplying lubricant to said antifriction bearings.
8. A double clutch transmission according to claim 7, wherein said transmission is disposed in a housing including an opening with a recess containing a bearing (26) supporting the central shaft at its end remote from said clutches K1, K2), said opening being covered by cover (28) including an oil supply structure for admitting oil to the central bore of the central input shaft (11).
9. A double clutch transmission according to claim 1, wherein said two secondary transmission shafts (22, 24) have drive pinions (29, 40) of different diameters.
10. A double clutch transmission according to claim 1, wherein each speed is shiftable to a sequentially next speed under load.
11. A double clutch transmission according to claim 10, wherein next to the gear set for said low forward speed (V1) two gear sets for forward speeds (V5, V3) are arranged on the central shaft (11) whereas next to the gear set for the another forward speed (V2) gear sets for two additional forward speeds (V4, V6) are arranged on the hollow drive shaft (12) of which one (V4) includes a gear (23) on the second secondary transmission shaft (24) and the other (V6) includes a gear (25) on the first secondary transmission shaft (22).
12. A double clutch transmission including two input shafts (11, 12) and two power input clutches (K1, K2) for supplying engine power to the transmission through various speed paths including at least a reverse speed path (R) a first forward speed path (11) and a second forward speed path (V2), a gear set for the reverse speed (R) disposed in sequential order with the first forward speed (V1) and the second forward speed (V2) of which the immediately adjacent first forward speed (V1) includes for the transmission of power a freely rotatable gear (31), which is also disposed in the power path through the transmission for the reverse speed (R) when the reverse speed is engaged and the reverse speed is assigned the same friction clutch K2 as the second forward speed (V2) so that power is transferred for these two gears (R, V2) via the same input gear (21) and the first forward speed is engageable by the other friction clutch (K1) so that the transmission can be shifted between first speed and reverse under power.
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