DE102007045588A1 - Torque transmission device for use in transmission i.e. double clutch gear, has pressure pad with torque transferring element and stuffing cross section, which is opened to pressure chamber, where cross section is designed to be C shaped - Google Patents

Abstract

The device has a wet-current coupling device (27, 38), in particular lamellae coupling device, which is operated by an operable lever device (44, 45) i.e. operable lever spring device, by a pressure pad (60). The pressure pad has a stuffing cross section, which is opened to a pressure chamber (70). The section is designed to be C shaped, and the pad has a torque transferring element, which is connected with a pump drive element (65) in a torque proof manner at a torque transfer interface (61) between the pad and the drive element, which drives a pump.

Description

The The invention relates to a torque transmission device, in particular in the drive train of a motor vehicle, with at least one wet-running Coupling device, in particular a multi-plate clutch device, by an actuating lever device, in particular an actuating lever spring device, via a Pressure piece actuated is.

Such a torque transmission device is for example from the German patent application DE 10 2005 027 610 A1 known.

task The invention is a torque transmission device according to the preamble of claim 1, the simple design and inexpensive to produce is.

The Task is with a torque transmission device, in particular in the drive train of a motor vehicle, with at least a wet-running coupling device, in particular a multi-plate clutch device, by an actuating lever device, in particular an actuating lever spring device, via a Pressure piece actuated is solved by that the pressure piece has a jam section which is open to a pressure chamber. According to one essential aspect of the invention fulfills the pressure piece in addition to its pressure transfer function at least one more function, such as the transmission of torque or the reduction of leakage from the pressure chamber. The pressure chamber is, for example, with the aid of a cooling oil pump, with a cooling medium supplied, for cooling the coupling device is used. The stowage cross section defines an annulus, in which in the operation of the rotating coupling device under Centrifugal effect of a cooling medium ring accumulates. By the pressure of the coolant ring a centrifugal force-induced leakage from the pressure chamber is prevented or decreased.

One preferred embodiment the torque transmitting device is characterized in that the accumulation cross-section substantially C-shaped is trained. The storage cross-section is preferably formed and arranged between the free ends of two legs of the C-shaped Jam cross-section opens a leakage gap.

One Another preferred embodiment the torque transmitting device is characterized in that the accumulation cross-section an annular space limited, over a leakage gap communicates with the pressure chamber. By doing Annulus accumulates in the operation of the rotating coupling device under centrifugal force a cooling medium ring at.

One Another preferred embodiment the torque transmitting device is characterized in that the pressure piece is formed like a ring. Preferably, the annular pressure piece is between the actuating lever means and a clutch disk, in particular a clutch disk, arranged, in particular clamped or clamped.

One Another preferred embodiment the torque transmitting device is characterized in that the pressure piece at least one torque transfer element at a torque transfer interface between the pressure piece and a pump drive element that drives a pump rotatably is connected to the pump drive element. Preferably, the Torque transfer interface on such a big one Realized diameter that the associated investment force, that is, the surface pressure, so far reduced is that a single torque transfer element sufficient to transmit the torque occurring during operation.

One Another preferred embodiment the torque transmitting device is characterized in that the pressure piece radially inward at least a particular circular arc-shaped Has recess. The recess creates a possibility of intervention for one complementary formed projection provided on the pump drive element is.

One Another preferred embodiment the torque transmitting device is characterized in that on the pump drive element radially Outside a projection is provided which engages in the recess of the pressure piece. As a result, a rotationally fixed connection between the pump drive element and the pressure piece created.

One Another preferred embodiment the torque transmitting device is characterized in that the pump drive element by a bearing device with a sealing function on a support element of Coupling device, in particular a Lamel lenträger, rotatably mounted is. The storage of the pump drive element on the support element is preferably designed so that no cooling oil escape in the radial direction can.

A further preferred embodiment of the torque transmission device is characterized in that the pressure piece has at least one torque transfer element which is connected to a torque transfer interface between rule the thrust piece and the coupling device, in particular a plate carrier of the coupling device, rotatably connected to the coupling device, in particular the plate carrier is connected. As a result, the transmission of a torque for driving a cooling oil pump is made possible in a simple manner.

One Another preferred embodiment the torque transmitting device is characterized in that the pressure piece radially outward at least having a driving lug. The driving nose, which also acts as a driving tooth is designated creates a positive connection between the Pressure piece and the coupling device.

One Another preferred embodiment the torque transmitting device is characterized in that at the coupling means a Recess is provided, in which engages the driving lug of the pressure piece. Preferably, a plurality of driving lugs are particularly uniform over the Scope of the pressure piece distributed.

One Another preferred embodiment the torque transmitting device is characterized in that the pressure piece between the actuating lever means and a clutch disk, in particular a clutch disk, is arranged. Due to the pressure piece several clutch discs, which are also referred to as clutch plates, compressed to a frictional Create connection.

One Another preferred embodiment the torque transmitting device is characterized in that the pressure piece has a pressure nose, which rests against the clutch disc. The pressure nose extends preferably in the axial direction.

One Another preferred embodiment the torque transmitting device is characterized in that the pressure piece, viewed in cross-section, has a dome on which the actuating lever device is applied. The size of the diameter, on which the dome is arranged, affects the gear ratio of Actuating lever device.

The The invention further relates to a transmission, in particular a dual-clutch transmission, with at least one transmission input shaft, in particular with two transmission input shafts, and with a previously described torque transmitting device for transmission torque between an internal combustion engine and the transmission.

Further Advantages, features and details of the invention will become apparent the following description, with reference to the drawing an embodiment is described in detail. Show it:

1 the representation of a half section through a drive train with a torque transmission device according to the invention;

2 a pressure piece of the torque transmission device 1 in the plan view;

3 the pressure piece off 2 on average and

4 a perspective sectional view of the pressure piece from the 2 and 3 ,

In 1 is part of a powertrain 1 a motor vehicle shown. Between a drive unit 3 , in particular an internal combustion engine, of which a crankshaft 4 goes out, and a gearbox 5 is a wet-running double clutch 6 arranged in lamellar construction. Between the drive unit 3 and the double clutch 6 is a torsional vibration damping device 8th connected. In the torsional vibration damping device 8th it is a dual mass flywheel.

The crankshaft 4 the internal combustion engine 3 is via a screw connection 9 fixed to an entrance section 10 the torsional vibration damping device 8th connected. The entrance part 10 the torsional vibration damping device 8th has substantially the shape of a radially extending annular disc, to the radially outside a starter ring gear 11 welded. In addition, at the entrance part 10 the torsional vibration damping device 8th a flywheel 12 attached. The flywheel 12 and the entrance part 10 the torsional vibration damping device 8th form a vibration damper cage, in which a plurality of energy storage devices, in particular spring devices 16 at least partially included.

In the spring devices 16 engages a starting part 18 the torsional vibration damping device 8th one. The starting part 18 is about a connection part 22 rotatably with an input part 24 the double clutch 6 connected. The coupling input part 24 is integral with an outer disc carrier 26 a first multi-plate clutch assembly 27 connected. Radially inside the outer disk carrier 26 is an inner disc carrier 28 the first multi-plate clutch assembly 27 angeord net. The inner disc carrier 28 is at a hub part 30 attached, the non-rotatably via a toothing with a first transmission input shaft 31 connected is. The first transmission input shaft 31 is designed as a solid shaft.

The coupling input part 24 or the outer disk carrier integrally connected therewith 26 the first multi-plate clutch assembly 27 is about a connection part 34 rotatably with an outer disk carrier 36 a second multi-plate clutch assembly 38 connected. In the example shown, the connecting part 34 integral with the outer disc carrier 36 connected. Radially inside the outer disk carrier 36 is an inner disc carrier 40 the second disk clutch assembly 38 arranged in one piece with a hub part 41 connected is. The hub part 41 is rotatably via a toothing with a second transmission input shaft 42 connected, which is designed as a hollow shaft. In the second transmission input shaft 42 is the first transmission input shaft 31 rotatably arranged.

The two multi-plate clutch arrangements 27 and 38 Be over control lever 44 . 45 operated, whose radially inner ends are supported on actuating bearings. The actuating bearings are actuated by means of actuating piston in the axial direction. The operating levers 44 . 45 are preferably integrally connected with associated disc spring devices.

Every friction clutch 27 . 38 has drive-side and output-side friction units 48 . 49 , which by means of an axial compression parallel to a rotation axis 50 at least one of the transmission input shafts 31 . 42 can be acted upon each other to form a frictional engagement. The friction units 48 . 49 the two friction clutches 27 . 38 are arranged radially one above the other and formed of a plurality of layers in the axial direction on the drive side and the output side alternating friction partner.

Between the operating levers 44 . 45 and the associated friction units 48 . 49 is in each case a pressure piece 59 . 60 arranged. About the pressure pieces 59 . 60 the contact pressure for actuating the double clutch 6 from the operating levers 44 . 45 on the associated friction units 48 . 49 transfer. The pressure piece 60 is radially inward at a torque transfer interface 61 rotatable with a collar 64 a drive sleeve 65 connected. Radially outside is the pressure piece 60 at another torque transfer interface 62 rotatably with the outer disk carrier 36 the second disk clutch assembly 38 connected.

The drive sleeve 65 is rotatably connected to a pump drive element of a (not shown) pump, which serves a coolant flow for cooling at least one friction clutch 27 . 38 provide. The pump is, for example, an internal gear pump, in particular a gerotor pump, via the crankshaft 4 is driven. By arrows 67 . 68 . 69 is indicated that the provided by the pump coolant flow, in particular cooling oil flow, through an annular space between the transmission input shaft 42 and the drive sleeve 65 is formed in a pressure chamber 70 arrives. The pressure chamber 70 becomes laterally from a radial section in the axial direction 71 of the inner disk carrier 40 and from a guide ring 73 limited. Through a leakage gap between the guide ring 73 and the inner disc carrier 40 or the friction unit 49 Coolant enters from the pressure chamber 70 in an annulus 72 , of a ring-like body 74 of the pressure piece 60 is limited.

In the 2 to 4 is the pressure piece 60 with the ring-like body 74 shown in three different views. Radially outside are on the ring-like body 74 , which essentially has the shape of a circular disk, four driver teeth 76 to 79 evenly distributed over the outer circumference. The driver teeth 76 to 79 , which are also referred to as driving lugs, extend from the outer circumference of the annular base body 74 radially outward. The width of the driver teeth 76 to 79 decreases towards the outside. Radial inside, the ring-like body 74 two diametrically arranged recesses 81 . 82 which essentially have the shape of circular arcs.

In 4 you can see that the ring-like body 74 viewed in cross section, radially outwardly a circumferential pressure nose 84 having. From the pressure nose 84 goes a thigh 85 a substantially C-shaped stowage cross section. The thigh 85 is integral with a base 86 connected, of which another leg 87 emanates. In the transition area between the leg 85 and the base 86 has the ring-like body 74 a circumferential dome 89 on.

According to an essential aspect of the invention, a pressure piece is created with a small size, in which various functions are integrated to save additional components. The pressure piece 60 is preferably made in one piece as a sheet metal part with a high rigidity. By the pressure piece according to the invention 60 In particular, a separate pump drive can be saved. As a result, the costs of the wet-running dual clutch can be further reduced. In addition, by the pressure piece according to the invention 60 the cooling oil circulation improves and the drag torque reduced. This can save fuel.

In the in 1 shown wet-running dual-clutch transmission, the clutch discs or fins of the friction unit 49 the second multi-plate clutch assembly 38 for transmitting the pending engine torque to the transmission 5 through the pressure piece 60 pressed. The pressure piece according to the invention 60 also fulfills two additional functions. On the one hand can by the drawn inward pot of the ring-like body 74 that is by the base 86 with the thighs 85 . 87 formed accumulation cross-section, an oil ring in the annulus 72 be accumulated, the pressure of which prevents greater leakage in the centrifugal oil gap. This supports the cooling function of the clutch plates.

Furthermore, about the recesses 81 . 82 , in which corresponding radial projections of the collar 64 engage, the drive sleeve 65 rotationally driven. Furthermore, the driver teeth grip 76 to 79 in corresponding recesses of the outer disk carrier 36 one. Thus, over the pressure piece 60 a non-rotatable connection between the outer disk carrier 36 and the drive sleeve 65 created. This allows the engine speed of the crankshaft 4 be passed to the cooling oil pump of the dual clutch transmission to maintain a constant cooling oil flow rate.

The pressure piece 60 is between the operating lever spring 45 and the friction unit 49 arranged, which comprises the disk set, and serves mainly the structure of the contact pressure in the second disk clutch assembly 38 , The operating lever spring 45 is at the top 89 and presses the disk set of the friction unit 49 with the pressure nose 84 together. With the diameter for clamping the operating lever spring 45 in the Außenla mellenträger 36 , the diameter of the operating lever spring 45 at the associated Aktorik and the diameter of the dome 89 of the pressure piece 60 becomes the gear ratio of the operating lever 45 for the clutch assembly 38 certainly.

The bearing of the pump drive sleeve 65 on the inner disk carrier 40 to which the guide ring 73 is designed so that the cooling oil can not escape radially. By selecting a suitable bearing, for example a sliding bearing, a sealing function can be fulfilled. The bearing is designed so that cooling oil in its flow direction is not influenced by the bearing and directly into the pressure chamber 70 arrives.

The cooling oil coming out of the pressure chamber 70 not directly into the grooves of the friction plates of the friction unit 49 passes, escapes partially through the leakage gap from the pressure chamber into the annulus 72 that from the base 86 and thighs 85 . 87 of the ring-like body 74 of the pressure piece 60 is limited. Due to the rotational movement of the individual components, the cooling medium settles radially on the outside of the leg 85 and builds on a Fliehölring, which counteracts by its pressure another leak. The differential speed, the unconfirmed clutch assembly 38 between the pressure chamber 70 limiting parts and the pressure piece 60 arises, supports the Anstauwirkung in the annulus 72 ,

1

powertrain

3

drive unit

4

crankshaft

5

transmission

6

Double coupling

8th

Torsional vibration damping unit

9

screw

10

introductory

11

Starter gear

12

Inertia

16

spring means

18

output portion

22

connecting part

24

Entrance part (outer plate carrier 26 )

26

External disk carrier

27

first Multi-plate clutch arrangement

28

Inner disk carrier

30

hub part

31

Transmission input shaft

34

Connecting part (outer plate carrier 36 )

36

External disk carrier

38

second Multi-plate clutch arrangement

40

Inner disk carrier

41

hub part

42

Transmission input shaft

44

actuating lever

45

actuating lever

48

Friction unit

49

Friction unit

50

axis of rotation

59

Pressure piece

60

Pressure piece

61

Torque transfer interface

62

Torque transfer interface

64

collar

65

drive sleeve

67

arrow

68

arrow

69

arrow

70

pressure chamber

71

section

72

annulus

73

wall

74

ring-like body

76

dog tooth

77

dog tooth

78

dog tooth

79

dog tooth

81

recess

82

recess

84

pressure nose

85

leg

86

Base

87

leg

89

knoll

Claims (15)

Torque transmission device, in particular in the drive train ( 1 ) of a motor vehicle, with at least one wet-running coupling device ( 27 . 38 ), in particular a multi-disc clutch device, which by an actuating lever device ( 44 . 45 ), in particular an actuating lever spring device, via a pressure piece ( 60 ) is actuated, characterized in that the pressure piece ( 60 ) a stowage cross-section ( 85 - 87 ), which leads to a pressure chamber ( 70 ) is open. Torque transmission device according to claim 1, characterized in that the accumulation cross-section ( 85 - 87 ) is formed substantially C-shaped. Torque transfer device according to one of the preceding claims, characterized in that the accumulation cross-section ( 85 - 87 ) an annulus ( 72 ), which via a leakage gap with the pressure chamber ( 70 ). Torque transmission device according to one of the preceding claims, characterized in that the pressure piece ( 60 ) is formed like a ring. Torque transmission device according to the preamble of claim 1, in particular according to one of the preceding claims, characterized in that the pressure piece ( 60 ) has at least one torque transfer element which at a torque transfer interface ( 61 ) between the pressure piece ( 60 ) and a pump drive element ( 65 ), which drives a pump rotatably with the pump drive element ( 65 ) connected is. Torque transmission device according to claim 5, characterized in that the pressure piece ( 60 ) radially inwardly at least one in particular circular arc-shaped recess ( 81 . 82 ) having. Torque transmission device according to claim 6, characterized in that on the pump drive element ( 65 ) is provided radially on the outside a projection which in the recess ( 81 . 82 ) engages the pressure piece. Torque transmission device according to one of claims 5 to 7, characterized in that the pump drive element ( 65 ) by a bearing device with sealing function on a support element ( 40 . 73 ) of the coupling device, in particular a plate carrier, is rotatably mounted. Torque transmission device according to the preamble of claim 1, in particular according to one of the preceding claims, characterized in that the pressure piece ( 60 ) has at least one torque transfer element which at a torque transfer interface ( 62 ) between the pressure piece ( 60 ) and the coupling device ( 38 ), in particular a disk carrier ( 36 ) of the coupling device ( 38 ), rotatably connected to the coupling device, in particular the plate carrier is connected. Torque transmission device according to claim 9, characterized in that the pressure piece ( 60 ) radially outside at least one catch nose ( 76 - 79 ) having. Torque transmission device according to claim 10, characterized in that on the coupling device a recess is provided, in which the driving lug ( 76 - 79 ) of the pressure piece ( 60 ) intervenes. Torque transmission device according to one of the preceding claims, characterized in that the pressure piece ( 60 ) between the actuating lever device ( 45 ) and a clutch disc, in particular a clutch plate, is arranged. Torque transmission device according to claim 12, characterized in that the pressure piece ( 60 ) a pressure nose ( 84 ), which bears against the clutch disc. Torque transmission device according to one of the preceding claims, characterized in that the pressure piece ( 60 ), viewed in cross-section, a dome ( 89 ), at which the actuating lever device ( 45 ) is present. Transmission, in particular dual-clutch transmission, with at least one transmission input shaft ( 42 ), in particular with two transmission input shafts, and with a torque transmission device according to one of the preceding claims for the transmission of torque between an internal combustion engine ( 3 ) and the transmission ( 5 ).