WO2014184161A1

WO2014184161A1 - Integrated cooling system for clutch transmissions having a dry single clutch or a dry dual clutch

Info

Publication number: WO2014184161A1
Application number: PCT/EP2014/059696
Authority: WO
Inventors: Johann Kirchhoffer; Jochen HAUSCHILD
Original assignee: Ford Global Technologies, Llc; Ford-Werke Gmbh
Priority date: 2013-05-15
Filing date: 2014-05-13
Publication date: 2014-11-20
Also published as: CN105358855A; EP2997275A1

Abstract

The invention relates to a clutch transmission for motor vehicles, comprising a dry single clutch (27) or a dry dual clutch (1), which transmits the torque from the motor to the transmission or optionally to one of two partial transmissions, and a cooling system having a fan wheel system for the active air cooling of the single clutch (27) or the dual clutch (1), wherein the particular clutch has a central disk (3) and a pressure plate (4, 5) on at least one side, which pressure plate optionally can be coupled to the central disk (3), and wherein the central disk (3) and/or at least one of the pressure plates (4, 5) has passages (12) for the cooling air flow (17), which extend radially or have a radial component. In order to further improve and optimize the cooling system, which is already known for a dual clutch, and to be able to use said cooling system also for single clutches, the passages (12) according to the invention are formed by ribs (13) and/or grooves (16) provided in the central disk (3) and/or the pressure plates (4, 5) and that the direction of the cooling air flow and/or the cooling air amount together with the cooling mass can be set by the form and arrangement of the ribs (13) and/or grooves (16).

Description

Integrated cooling system for clutch transmission with a dry

Single clutch or a dry double clutch Description

The invention relates to a clutch transmission for motor vehicles with a dry single clutch or a dry dual clutch, each of which transmits the torque from the engine to the transmission or optionally to one of two partial transmissions, and to a cooling system with a fan wheel system for active air cooling of the individual clutch or the double clutch, wherein the respective clutch has a central disk and on at least one side a pressure plate, which is selectively coupled to the central disk, and wherein the central disk and / or at least one of the pressure plates is provided with passages for the cooling air flow, which extend radially or have a radial component.

Single clutches usually have only a single pressure plate in addition to the central disc, which is directly or selectively coupled to the central disc, while double clutches on each side a pressure plate is arranged in addition to the central disc, which can be coupled alternatively alternately with the central disc to the To transfer torque in each case to one of the two partial transmissions.

A dual-clutch transmission of the type mentioned has already been described in the earlier patent application 10 2013 201 423.6.

The object of the invention is to further improve and optimize the dry double clutch cooling system described in this earlier patent application, whereby this cooling system should also be applicable to single clutches.

According to the invention, this object is achieved in that the passages are provided by ribs and / or grooves provided in the central disk and / or the pressure plates. are formed and that by the shape and arrangement of the ribs and / or grooves, the direction of the cooling air flow and / or the amount of cooling air in combination with the cooling mass is adjustable. By various variations of the shape and arrangement of the ribs and / or grooves taking into account the direction of rotation of the central disk and the pressure plates of the cooling effect can be significantly improved with very simple means. The simplest type of arrangement of the ribs or grooves is the radial orientation, wherein normally the cooling air flow extends radially from the inside to the outside through the distances between the ribs or through the grooves.

Alternatively, the ribs and / or grooves may be bent against the running direction of the central disk and the pressure plate or pressure plates, in which case the cooling air flow extends radially from outside to inside. Due to the curved shape of the passages and the number of passages, a suction is produced and thereby generates a velocity vector of the cooling air and at the same time increases the amount of cooling air flowing as a function of the angular velocity.

Another variant may be that the ribs and / or grooves are angled at least once against the direction of travel. The bend can be about half the length of the ribs or any length of the ribs.

Another embodiment is that the ribs and / or grooves are bent with the running direction of the central disk and the pressure plates. This embodiment is particularly suitable when the cooling air flow is to run from outside to inside.

Even with this basic arrangement, the ribs and / or grooves can be angled at least once with the direction of the central disk and the pressure plate or the pressure plates, the bends can again be appropriate to about half or corresponding to any length. A further variant of the invention consists in that the passages formed by the ribs and / or grooves have an outwardly closed cross-section. As a result, channels are created in the central disk or in the pressure plates, through which the cooling air is to be guided, in order thereby to achieve a higher pump performance with a larger cooling surface area. Furthermore, this variant has the advantage of a larger cooling mass.

The passages formed by the ribs and / or grooves also need, for example, only half open and half closed, so that an optimization of the cooling mass is possible.

Another variant may be that the ribs or passages are rectilinear and work only as .Durchlässe 'and additionally a pump system with curved ribs is additionally attached via a screwing / riveting or pressing.

With the above variants of the ribs and passages can optionally on the central disk and / or on the pressure plates, the entire cooling system in the form of cooling air flows in the direction, quantity and speed from the inside outwards or outwards inwards depending on the direction of rotation and speed and in combination with corresponding cooling masses are set depending on the requirements of the drive train to be applied.

A first course of the cooling air may be such that the cooling air is introduced at the front end on the engine side of the clutch housing and then over

Passages in the drive pulley enters the clutch system that the radial passages are provided only in the central disk and that the central disk is closed on the side facing away from the drive disk. In this construction, the cooling flow passes through the drive pulley in the direction of the central disc and is deflected there, so that the cooling flow is then guided radially outwards through the central disc and exits at the radially outer end of the central disc. With this design, a lot of cooling air only passes through the central disk, so that the cooling effect, especially in the area of the central disk lies. The pressure plates are cooled in this case on the existing convection and primarily on their cooling mass.

A further second variant for a very intensive cooling can be effected in that the cooling air is introduced at both ends of the coupling housing in the coupling system and guided centrally from the coupling system, wherein a first arm of the cooling air flow through the central disk and one of the two pressure plates and the second Arm of the cooling air flow through the other pressure plate runs. This would also be the case if the central disk is closed on one side.

Alternatively, as a third variant, the cooling air can also be centrally introduced into the clutch housing by the pressure plates and the central disk and executed at both ends of the clutch housing, wherein a first arm of the cooling air flow through the central disk and one of the pressure plates and the second arm of the cooling air flow through the other Pressure plate runs. This would also be the case if the central disk is closed on one side.

All three variants described can also be provided with axial passages on the central disk, which can pass in both directions of the adjacent pressure plates cooling air flows, thus to accomplish a cooling path across the coupling system.

Finally, there is also the possibility that the cooling air flow on one side of the coupling housing via an insertion tube approximately centrally inserted and on the opposite side is radially executable by a Ausführstutzen.

In this embodiment, the insertion tube and the delivery nozzle can be arranged on opposite sides approximately tangentially to the coupling housing, wherein the two nozzles are approximately parallel to each other and point in approximately the same direction.

The positions of the inlet and outlet ports on the clutch housing are dependent on the previously described and predetermined cooling air flow directions. speed of the course of the ribs and bushings relative to the direction of rotation determined.

All cooling systems with ribs / passages as well as insertion and delivery nozzles, which are primarily described in connection with dual-clutch systems, can optionally also be applied to single-clutch systems, each with a central plate and a pressure plate.

The invention is illustrated by way of example in the drawing and described in detail with reference to the drawing. Show it:

Fig. 1: a partial view of a pressure plate,

2 shows a section along the line II-II of FIG. 1, with ribs as an example with a high cooling surface and a small cooling mass FIG. 3: a similar section as in FIG. 2, but with the ribs as

Grooves are formed, and thus a high cooling mass and a lower cooling attack surface is achieved as an example

4 shows a partial view of a pressure plate with ribs bent against the direction of rotation,

5 shows a similar view as FIG. 4 with ribs angled against the direction of rotation, FIG.

6: a partial view of a pressure plate with its bent in the direction of rotation

ribs

7 shows a similar partial view of the pressure plate with its ribs angled in the direction of rotation,

8 shows a similar section as in FIGS. 2 and 3 with closed passages, FIG.

9 shows the view of a central disk or pressure plate, wherein the passages are half open and half closed,

10 is a section along the line X-X of FIG. 9,

1 1: a section through a double clutch, in which the cooling air flow passes through the central disk,

Fig. 12: the same section as in Fig. 1 1 with cooling air inlets at both ends the coupling housing and central outlet,

13 shows the same section as FIG. 12 with a central inlet of the cooling air flow, FIG.

Fig. 14: the same section as Fig. 1 1 to 13 with laterally mounted radially

Cooling air entrances and exits,

FIG. 15 shows a schematic cross section through FIG. 14 with the illustration of FIG

Einführstutzens and the Ausführstutzens,

Fig. 16 is a partial view of a single disc clutch system in which

Cooling air flow can be guided in corresponding optional directions through the central disc and / or by the pressure plate,

Fig. 17 is a partial view of a central plate with opposite to the direction of rotation curved ribs,

18 shows a partial view of a central plate with ribs bent perpendicular to the direction of rotation and an additionally integrated fan system, and FIG. 19 shows a section through a double clutch in which the cooling air flow passes through the central disc and has an additional fan system.

A known double clutch transmission for motor vehicles consists of two partial transmissions, not shown in the drawing, a double coupling 1 shown for example in Fig. 1 1 or 12, which selectively transfers the torque from the engine to one of the two partial transmissions, and a cooling system with a Lüfterradsystem for active Air cooling of the double clutch.

The double clutch 1 consists essentially of a drive pulley 2, a central disc 3 connected thereto, pressure plates 4 and 5 provided on both sides of the central disc 3 and friction discs 6 and 7 arranged between the central disc 3 and the pressure plates 4 and 5.

The drive pulley 2 is non-rotatably mounted on an input shaft, not shown in the drawing, which is normally the output shaft or crankshaft of an engine. The central disk 3, which can be coupled by means of the pressure plates 4 and 5 with either one of the two friction plates 6 and 7, then transmits the torque of the motor either to a solid shaft 8 or to a surrounding hollow shaft 9, wherein the two shafts 8 and 9 are each connected to one of the two partial transmissions, not shown in the drawing.

The entire dual clutch 1 is surrounded by a clutch housing 10, shown schematically in FIG. Fig. 16 shows a coupling system 27 as used in manual transmissions. The coupling system 27 here consists of a central disk 3 and of a pressure plate 5 and a friction disk 7, which is rotatably connected to the solid shaft 8. The central disk 3 is fixedly connected here to the crankshaft or the secondary side of a dual-mass flywheel system 28. The torque transmission takes place by the coupling of the pressure plate 5 to the friction disk 7 and to the central disk 3 and via the central disk 3 and the friction disk 7 to the solid shaft 8.

As can be seen from FIGS. 1 1 and 12 and 16, the cooling air flow generated by a fan system flows around the clutch housing 10, the individual areas of the dual clutch 1 and the Einkupplungssystems 27, according to the invention in particular to the cooling of the central disk 3 and the Press plates 4 and / or 5 arrives. In order to achieve a particularly intensive cooling of the central disk 3 and the pressure plates 4 and 5, they are provided with passages 12 for the cooling air flow, wherein the passages 12 extend radially or are provided with a radial component. The various embodiments of the passages are shown in FIGS. 1 to 10 and FIGS. 17 and 18. In all representations, the central disk 3 or the pressure plate 4 in the direction of the arrow 1 1 to rotate counterclockwise. In Fig. 1, the situation corresponds to the embodiment shown in Fig. 12, in which the cooling air flow through the pressure plate 4 from the inside to the outside. The provided in the pressure plate 4 passages 12 are formed by ribs 13 which are arranged at uniform intervals from each other in radial alignment.

The cooling air thus flows through the pressure plate 4 in the radial direction. The air flow can, as shown for example in FIG. 12, be generated by means of a fan 14 provided in the drive disk 2 and / or by the pressure plate 4 itself, in which case only an air flow rate 14 must be provided in the drive disk. In Fig. 2 are in FIG. 1 shown in section, wherein in each case between two ribs 13, a corresponding passage 12 remains free.

Between the ribs 13 each spring supports 15 are provided. In Fig. 3, an alternative to the ribs 13 is shown, and indeed the passages are formed by grooves 16 which have the same geometric shape as the ribs 13 in the radial direction. Although the passages formed by the grooves 1 6 are narrower than the passages 12 formed between the ribs 13, but due to the narrower passages, a larger mass is given, which in turn absorbs more heat, so that less heat must be removed by the cooling air flow.

The rib and passage shapes, as described in FIGS. 2 and 3, can be varied in a pressure plate or central disk within a component in order to be able to optimize the cooling capacity accordingly.

In Fig. 4 as well as in Fig. 1, a section of the pressure plate 4 is shown. In this embodiment, again, the guidance of the air flow takes place from inside NEN to the outside, however, the passages 12 are formed bent in this embodiment. The shape of the passages 12 is formed such that the ribs 13 are bent against the running direction of the pressure plate 4. As a result, the directed from the inside out, indicated by the arrows 17 cooling flow is produced.

In the embodiment shown in Fig. 5, in which the cooling air flow 17 is also directed from the inside to the outside, the ribs 13 are angled approximately halfway against the direction of the central disc 3, whereby the directed from the inside to the outside cooling air flow 17 with two different Velocity vectors is executed. Optionally, several bends may be provided at different positions for further optimization of the cooling. In the embodiment shown in FIG. 6, the cooling air flow 17 extends through the pressure plate 4 from outside to inside. The ribs 13 are bent in the running direction of the central disk 3, so that by this formation of the ribs 13, a suction effect is generated inwardly. In the embodiment shown in Fig. 7, the ribs 13 are angled in the direction of the pressure plate 4, and indeed the deflection is approximately halfway along the ribs 13. Here, the cooling can also be optimized with multiple bends at different positions. In Fig. 8, another embodiment of the passages is shown. In this embodiment, the passages 12 are closed to the outside, so that channel-shaped passages arise, the bent, straight or angled, as described in the ribs, can be performed. In the pressure plate 4 shown in Fig. 9, the passages 12 are formed approximately half open and half closed. This construction is shown in an enlarged view in Fig. 10 as a section. In the embodiment shown in Fig. 9 and 10, the ribs 13 are bent against the direction and the cooling air flow 17 extends from the inside to the outside. In Fig. 17 is shown as an example of a central plate 3, in which the ribs 13 are bent in the direction of rotation and which guide the cooling air flow 17 from the inside to the outside. In this example, passages are provided in the radial and tangential directions to ensure an unobstructed flow of cooling flow. Here, too, the passages 12 or ribs 13 can be bent in a direction opposite to or in the direction of rotation, straight or angled to optimize the cooling system.

In Fig. 18 as an example, a central plate 3 is shown, in which the ribs 13 are made straight to the direction and the cooling air flow 17 lead from the inside to the outside by an additional fan 29. In this example, passages are provided in the radial and tangential direction in the central disk 3 in order to ensure an unimpeded cooling flow. Again, the passages 12 or ribs 13 may be bent in or opposite to the direction of rotation, straight or angled executed to optimize the cooling system. The cooling air flow 17 is generated via the additional fan 29 in response to the Lüfterradausführung in the direction of rotation from the inside out or vice versa and passed through the passages of the central disk 3.

In FIGS. 11 to 16 and in FIG. 19, different paths for the cooling air flow 17 are shown.

In the embodiment shown in Fig. 1 1, the cooling air flow extends from the inside to the outside. In this case, the cooling air flow 17 passes through a provided in the drive pulley 2 fan or air passage 14 in the not shown in detail in the drawing housing the dual clutch. 1 The passages 12 for the cooling air flow 17 are arranged exclusively in the central disk 3 in this embodiment. The central disk 3 is closed in this embodiment on the side facing away from the drive disk 2 18, so that the cooling air flow 17 is deflected directly to the central disk 3 radially outward. The passages may be bent, straight or angled opposite to the direction of rotation. In the embodiment shown in Fig. 12, a cooling air flow 17 is supplied in the direction of the arrows shown at both ends of the coupling housing 10.

The supplied on the motor side arm of the cooling air flow 17 passes through the disposed in the drive pulley 2 fan or air passage 14 as well as in the embodiment shown in Fig. 1 1 to the passages 12 of the central disk 3 and at the same time to the passages 12 of the between the central disk 3 and the drive pulley 2 arranged pressure plate 4. The entering at the opposite end of the dual clutch transmission 1 arm of the cooling air flow 17 passes through the passages 12 of the second pressure plate 5. The two cooling air streams 17 then meet in the middle of the housing and are then discharged centrally. As can be seen from FIG. 12, additional fans 19 may be provided in the friction disks between the central disk 3 and the pressure plates 4 and 5.

In the embodiment shown in Fig. 13, the cooling air is introduced centrally into the clutch housing 10. The cooling air flow 17 is then distributed to the passages 12 of the central disk 3 and the pressure plates 4 and 5.

The central disk 3 is closed as well as in the embodiments according to FIG. 1 1 and 12 on the side facing away from the drive disk 2 18, so that the cooling air streams 17 share in both directions. The arm of the cooling air flow 17 passing through the central disk 3 as well as through the pressure plate 4 located on the side of the drive disk 2 passes to a motor-side outlet 20 and the arm extending through the pressure plate 5 leaves the dual clutch 1 at the transmission-side end of the coupling housing 10 at the Outlet 21. The central disk 3 can also have an air flow 30 instead of being closed, as shown in FIGS. 14 and 12.

In Fig. 14 and 15, a further embodiment is shown, and indeed the cooling air flow 17 is introduced approximately centrally on one side of the housing 10 via an insertion tube 22 and executed on the opposite side by a Ausführstutzen 23. The insertion tube 22 and the delivery nozzle 23 are arranged approximately tangentially to the coupling housing 10, wherein the two nozzles 22 and 23 are approximately parallel to each other and point in approximately the same direction. The course of the cooling air flow 17 through the exemplary embodiment illustrated in FIG. 14 is otherwise approximately the same inside the housing as with the exemplary embodiments according to FIGS. 1 to 13, but can take place in both directions as a function of the rib or passage design. FIG. 16 shows a further exemplary embodiment, specifically with reference to a coupling system with passages / ribs in the central disk 3 and / or the pressure plate 5. The cooling flow 17 can also be bent in both directions in dependence on the design of the ribs or passages , be executed straight or angled to or opposite to the direction of rotation.

In Fig. 19, a further embodiment is shown, which provides an additional fan 29 in the central disk 3 for cooling air flow support. This fan is firmly connected to the central disk 3.

LIST OF REFERENCE NUMBERS

1 double clutch

2 drive pulley

3 central disc

4 pressure plate

5 pressure plate

6 friction disc

7 friction disc

8 full wave

9 hollow shaft

10 clutch housing

1 1 arrow

12 passages

13 ribs

14 fans or air outlet

15 spring pads

16 grooves

17 cooling air flow

8 opposite side of the central disk. 3

19 friction plates as fan system

20 first outlet

21 second outlet

22 insertion nozzle

23 outlet

25 first inlet

26 second inlet

27 coupling system

28 crankshaft or secondary side of a dual mass flywheel system

29 integrated fan wheel

30 Air outlet central disc

Claims

claims

1 . Clutch transmission for motor vehicles with a dry single clutch (27) or a dry dual clutch (1), each of which transmits the torque from the engine to the transmission or optionally one of two sub-transmissions, and a cooling system with a fan wheel system for active air cooling of the single clutch ( 27) and the double clutch (1), wherein the respective clutch has a central disc (3) and on at least one side a pressure plate (4, 5) which is selectively coupled to the central disc (3), and wherein the central disc (3 ) and / or at least one of the pressure plates (4, 5) is provided with passages (12) for the cooling air flow (17) which run radially or have a radial component,

characterized in that

the passages (12) are formed by ribs (13) and / or grooves (16) provided in the central disk (3) and / or the pressure plates (4, 5), and in that by the shape and arrangement of the ribs (13) and / or grooves (16) the direction of the cooling air flow and / or the amount of cooling air is adjustable together with the cooling mass.

2. clutch transmission according to claim 1,

characterized in that

the ribs (13) and / or grooves (16) are arranged radially. (Fig. 1)

3. clutch transmission according to claim 1,

characterized in that

the ribs (13) and / or grooves (16) against the direction of rotation of the central disc (3) and the pressure plates (4, 5) are bent. (Fig. 4)

4. clutch transmission according to claim 1,

characterized in that

the ribs (13) and / or grooves (16) are angled against the direction at least once. (Fig. 5)

5. clutch transmission according to claim 4,

characterized in that

the ribs (13) and / or grooves (16) are angled approximately at any length against the direction of travel. (Fig. 5)

6. clutch transmission according to claim 1,

characterized in that

the ribs (13) and / or grooves (16) with the running direction of the central disc (3) and the pressure plates (4, 5) are bent. (Fig. 6)

7. clutch transmission according to claim 1,

characterized in that

the ribs (13) and / or grooves (16) with the running direction of the central disc (3) and the pressure plates (4, 5) are angled at least once. (Fig. 7)

8. clutch transmission according to claim 7,

characterized in that

the ribs (13) and / or grooves (16) approximately at any length with the direction of the central disc (3) and the pressure plates (4, 5) are angled. (Fig. 7)

9. clutch transmission according to one of claims 1 to 8,

characterized in that

the passages (12) formed by the ribs (13) and / or grooves (16) have a cross-section closed to the outside. (Fig. 8, Fig. 17 and Fig. 18)

10. clutch transmission according to one of claims 1 to 8,

characterized in that

the passages (12) formed by the ribs (13) and / or grooves (16) are approximately half open and half closed. (Figures 9 and 10)

1 1. Clutch transmission according to one of claims 1 to 10,

characterized in that

the cooling air enters the clutch housing (10) through the drive disc (2), that the passages (12) in the central disc (3) are provided and that the central disc (3) on the side facing away from the drive disc (2) (18) optional closed (Fig. 1 1) or open (Fig. 12).

12. A clutch transmission according to one of claims 1 to 10,

characterized in that

the cooling air at both ends of the coupling housing (10) insertable and centrally executable, wherein a first arm of the cooling air flow (17) through the central disc (3) and by one of the pressure plates (4) and the second arm of the cooling air flow (17) through the other pressure plate (5) runs. (Fig. 12)

13. A clutch transmission according to one of claims 1 to 10,

characterized in that

the cooling air is centrally insertable into the coupling housing (10) and executable at both ends of the coupling housing (10), a first arm of the cooling air flow through the central disc (3) and through one of the pressure plates (4) and the second arm of the cooling air flow through the other pressure plate (5) runs. (Fig. 13)

14. Clutch transmission according to one of claims 1 to 10,

characterized in that

the cooling air flow (17) on one side of the coupling housing (10) via an insertion nozzle (22) approximately centrally inserted and on the opposite side by a Ausführstutzen (23) is executable. (Figures 14 and 15)

15. Clutch transmission according to claim 14,

characterized in that

the inlet connection (22) and the delivery connection (23) are arranged on opposite sides approximately tangentially to the coupling housing (10) and that the two connection pieces (22, 23) run approximately parallel to one another and have the same direction. (Figures 14 and 15)

16. Kupplungsget ebe according to one of claims 1 to 10,

characterized in that

the cooling air flow (17) is generated with the aid of an additional fan wheel fixedly attached to the central disc (3) (FIGS. 18 and 19).

17. Clutch transmission according to one of claims 1 to 10,

characterized in that

the cooling air flow (17) is guided either in both directions through the central disk 3 and the pressure plate or the pressure plates (4, 5).

18. Clutch transmission according to one of claims 1 1 to 13,

characterized in that

the cooling air flow (17) either in the middle or at the two ends of the clutch housing on or executed.