SE467573B - STEERING EXCHANGE AUTOMATVAEXELLAADA - Google Patents

Description

467 573 2 10 15 20 25 30 35 This is achieved according to the invention in that the reverse gear is lockable on its shaft only by means of a conical coupling.

The invention is based on the elements that normally occur at backing is so low that a simple cone is sufficient coupling whose coupling force is preferably provided by means of partly hydraulic pressure, to lock the reverse gear on its shaft.

By eliminating a coupling sleeve with form-fitting engagement with cooperating coupling elements the risk of locking is eliminated caused by the input torque of the torque converter.

The invention is described in more detail below with reference to on the accompanying drawing shows exemplary embodiments, in which Fig. 1 shows a schematic end view of a gearbox according to and fig. 2 a schematic longitudinal section along the line I-I in Fig. 1.

The gearbox shown in the figures is a five-speed automatic gearbox intended for rear-wheel drive. the gearbox has a housing 1 with an input shaft 2, which is driven of a motor (not shown) via a conventional hydraulic torque transducer 3. The input shaft 2 has a pair of non-rotatable drive gears 4 and 5 fixed on the shaft, which engage with a pair on a first intermediate shaft 6 and a second intermediate shaft 7 rotatably mounted gears 8 and 9, respectively, which are lockable on theirs respective shafts by means of first and second multi-disc wet lamella couplings 10 and 11 respectively.

The input shaft 2 has a further shaft rotating on the shaft. fixed gear 12. which engages with each other on the gear shaft 6, 7 rotatably mounted gears 13 and 14, which ka are lockable on their shoulders of third and fourth multi-disc wet lamella couplings 15 and 16. Each intermediate shaft drives one output shaft 17 via a shaft rotatably connected to the respective shaft gears 18 and 19. which engage with one via a one-way clutch 20 on the output shaft mounted first gear 21 and a gear wheel non-rotatably fixed to the shaft 22. One-way clutch 10 15 20 25 30 35 3 467 573 The ring 20 can be locked by means of a multi-disc wet lamella coupling 23 and the input and output shafts can be locked together by one multi-disc wet lamella coupling 25.

On the intermediate shaft 6, a gear 26 is mounted for rotation to together with the gear 8. The gear 26 engages with one reverse gear 27, which is freely rotatably mounted on the shaft 7 and lockable on the shaft 7 of a generally designated 28 mechanical coupling, which comprises one with an axially displaceable annular hydraulic piston 29 connected coupling cone 30. Between piston 29 and an annular cylinder fixedly connected to the shaft 7 relief element 31 delimits an annular chamber 32 and at supply of pressure oil to the chamber 32 displaces the piston 29 axially, its coupling cone 30 being brought into engagement with a complementary coupling cone 33, which is fixedly connected to the reverse gear 26 so that it locks on the intermediate shaft 7.

The gearbox in the described gearbox is controlled by one not shown electronic, microprocessor-controlled control system. that affects a hydraulic control system (not shown), which regulates switching on and off of the respective connections.

At the various gears, the torque is transmitted from the input to the output walking shaft as follows: One) The gear pair 4, 8 clutch engaged 10, the gear the pair 18, 21 and the freewheel clutch 20; Second) Gear pair 5, 9, clutch engaged 11 and gear wheel pair 19, 22: Trean) Gear pair 12, 13. engaged clutch 15, gear the wheel pair 18, 21 and the freewheel clutch 20; Four) Gear pair 12, 14, clutch engaged 16 and gear wheel pair 19, 22: Five) Activated clutch 25 (direct gear); 467 573 4 Hill) Gear pair 4, 8, disengaged clutch 10. gear the wheel pair 26, 27, the engaged clutch 28 and the gear pair 19, 22. The invention provides a simple, reliable and com- pact construction at which shift to and from reverse gear achieved without risk of blockage and impact. 110

Claims (3)

Claims 10 A continuously variable automatic transmission for motor vehicles, comprising an input shaft driven by a torque converter. at least one intermediate shaft, an output shaft and gears grouped on the shafts in pairs for driving the output shaft from the input shaft via the intermediate shaft in a first direction, wherein at least one gear in each gear pair is freely rotatable on the associated shaft and lockable on the shaft by means of a multi-disc wet lamella coupling and a rotatable and by means of a coupling lockable reverse gear on one shaft engages a gear on another shaft, over which the output shaft is drivable in a direction opposite to said first direction when the coupling is switched on, in that the reverse gear (27) is lockable on its shaft (7) only by means of a conical coupling (28). k ä n n e t e c k n a d Gearbox according to claim 1, characterized in that the conical coupling (28) is hydraulically operated. Gearbox according to Claim 1 or 2, characterized in that the input shaft (2) has gears (4,5, 12) in engagement with gears (8, 9, 13, 14) on two intermediate shafts, of which one (7) carries the reverse gear (27) and the other (6) the gear (26) engaging the reverse gear.