192 clutches and power-stop control – Transmission control and clutch control – Common control
Patent
1992-04-28
1994-01-04
Bonck, Rodney H.
192 clutches and power-stop control
Transmission control and clutch control
Common control
192 362, 192 363, 192 83, 74330, B60K 4122
Patent
active
052752666
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a double clutch change-speed gearbox for motor vehicles in accordance with the preamble to claim 1.
A motor vehicle gearbox of this type is described in EP-A2 0 144 737. The drive to the gearbox is divided into two coaxial shafts, each shaft being connected to a clutch. Gears 1, 3 and 5 are associated with one shaft and gears 2, 4 and reverse are associated with the other shaft or clutch. By actuating the corresponding clutch, it is possible in each case to change, without interrupting the tractive effort, from one gear of one shaft to one gear of the other shaft.
This gives rise, of course, to the limiting factor that the gears cannot be arbitrarily selected one after another. Thus, for example, it is possible to change down directly from fifth gear into fourth gear or second gear but not into third gear. This applies in an analogous manner to all the other gears and also, in fact, to changing up. The known gearbox also has a complicated electrohydraulic control system which is connected to a gear shift lever and which, in addition to the clutches, also controls the actuation of the gear shift in accordance with a specified program.
The invention is based on the object of increasing the freedom of choice in gear shifting in such a gearbox where the gear can be selected under load but, at the same time, of reducing and simplifying the complexity necessary for this purpose.
The object is achieved by means of the features of claim 1.
One simplification follows from the fact that the whole of the synchronizing and shift mechanism becomes unnecessary in the case of the selected gear associated with the selector clutch. In the case of a gearbox with direct through drive and operating with a countershaft, for example, the direct drive train can be connected to the selector clutch. In the case of a gearbox without direct through drive, only a simple gearwheel transmission is necessary for the selected gear, it being possible for the gearwheels to be permanently connected to the relevant shaft. In each case, the hollow shaft can be kept short because it is only necessary to accommodate one gearwheel on it.
If the selector clutch is in engagement, the vehicle operation takes place in the gear stage of the selected gear, and the shift gear positions can be arbitrarily selected. The shift gear stage whose position has in each case been selected becomes operationally effective by opposing actuation of the clutches by means of the switching element of the on/off control; it is therefore possible to change from the selected gear to any shift gear and back by, so to speak, pressing a button.
Because, due to the nature of such a gearbox, the clutches are actuated oppositely during each change, the selector clutch also comes into operation even when changing from one shift gear into another, although only for the duration of the gear-changing procedure; the duration of engagement of the selector clutch ends when the new gear position has been selected.
On the other hand, the selector clutch can be arbitrarily engaged and can remain so even if no other shift gear position is to be selected; the gear is then changed from the shift gear whose position has been selected to the selected gear without the necessity of actuating the gearbox itself.
If, for example, the third gear stage is connected as the selected gear to the selector clutch, the latter is engaged when changing the gearbox from first gear to second gear for the duration of the gear shift; in this case, the selector clutch develops, so to speak, a synchronizing function. If it is required to change from second gear to third gear, simply switching over from the gear shift clutch to the selector clutch is sufficient. Switching in the reverse direction restores second gear. It is therefore possible -- in city traffic, for example--to alternate easily and rapidly between second and third gear, in particular without actuating the gearbox and without the conventional clutch operations.
The same applies analogously when, during the use of the select
REFERENCES:
patent: 4428248 (1984-01-01), Beoucksou et al.
patent: 4632234 (1986-12-01), Bardoll et al.
patent: 4727472 (1988-02-01), Deutsch et al.
patent: 4860607 (1989-08-01), Numazawa et al.
patent: 5038901 (1991-08-01), Parsons et al.
Bonck Rodney H.
Pitts Andrea
LandOfFree
Double clutch change-speed gearbox for motor vehicles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Double clutch change-speed gearbox for motor vehicles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double clutch change-speed gearbox for motor vehicles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-300990