DE102018132254A1 - Hybrid module with space-saving return spring and compensation chamber - Google Patents

Abstract

The invention relates to a hybrid module (1) for a drive train (2) of a motor vehicle, comprising a housing (3), an input shaft (4) mounted in the housing (3) for introducing a torque generated by a first drive machine, a rotor carrier (5 ) for introducing a torque generated by a second drive machine, a separating clutch (6) for switchable rotary coupling of the input shaft (4) to the rotor support (5), a clutch (7) for rotary coupling of the rotor support (5) to an output shaft (8), with a hydraulic actuation system (9) for actuating the separating clutch (6), the actuation system (9) containing an actuation cylinder (10) and an actuation piston (11) axially displaceably received in the actuation cylinder (10), with a return spring (19) for Application of a restoring force counteracting the actuating force of the actuating piston (11), and with a compensation chamber (20) for receiving hydraulic fluid luid to compensate for an actuating force of the actuating piston (11) generated by the centrifugal force, the return spring (19) and / or the compensating chamber (20) at least partially protruding into an axial installation space which lies radially inside the separating clutch (6).

Description

The invention relates to a hybrid module for a (hybrid) drive train of a motor vehicle, having a housing, an input shaft mounted in the housing for introducing a torque generated by a first drive machine, a rotor support for introducing a torque generated by a second drive machine, a disconnect clutch for switchable Rotary coupling of the input shaft with the rotor carrier, a coupling for rotary coupling of the rotor carrier with an output shaft, with a hydraulic actuation system for actuating the separating clutch, the actuation system including an actuation cylinder and an actuation piston axially displaceably received in the actuation cylinder, with a return spring for applying one of the actuation force of the actuating piston counteracting restoring force, and with a compensation chamber for receiving hydraulic fluid to compensate for an actuating force generated by the centrifugal force de s actuating piston.

Hybrid modules are already known from the prior art. For example, the DE 10 2009 059 944 A1 a hybrid module for a drive train of a vehicle, with a first disconnect clutch, an electric motor and a second disconnect clutch, the first disconnect clutch being arranged in the torque flow between an internal combustion engine in the drive train and the electric motor and the second disconnect clutch in the torque flow between the electric motor and a transmission in the drive train, wherein the first clutch and the second clutch are arranged in a common wet room.

Another document also discloses that DE 10 2007 008 946 A1 , a clutch system for motor vehicle drives with at least one clutch input and at least two transmission input shafts, each transmission input shaft being connected to the clutch input via a separate liquid-cooled and lubricated friction clutch, each friction clutch each having a disk set which is arranged between an inner disk carrier and an outer disk carrier and wherein Plate packs are spatially adjacent to one another, the inner plate carrier being connected at least in a rotationally rigid manner to a clutch input, an outer plate carrier being connected to a transmission input shaft at least in a torsionally rigid manner, the clutch system having at least two clutch inputs, one clutch input being a clutch input shaft and the other clutch input being an outer plate carrier is and wherein the clutch input shaft is operatively connected to an internal combustion engine while on an outer disk carrier Rotor of an electric drive is arranged.

Also is from the not yet published DE 10 2017 129 873 A1 a hybrid module for a drive train of a motor vehicle is known, with a housing, a separating clutch, a hydraulic actuating unit which interacts with the separating clutch and is accommodated on the housing, and an electrical machine, a rotor of the electrical machine being coupled or couplable in a rotary manner to a coupling component of the separating clutch, and wherein the actuating unit has a piston element which is displaceably received relative to the housing and which is connected by means of an actuating bearing so as to be displaceable in an axial direction of the separating clutch, but relatively rotatable to a pressure element serving to engage and disengage the separating clutch, characterized in that the actuating bearing is designed as an axial needle bearing.

However, the prior art always has the disadvantage that, particularly in the case of hybrid modules with a triple clutch, namely with a disconnect clutch and a double clutch, and a coaxially arranged electrical machine, the installation space for installing the triple clutch, in particular in the axial direction, is very limited. As a result, previously known triple clutch designs cannot be used.

It is therefore the object of the invention to avoid or at least alleviate the disadvantages of the prior art. In particular, a hybrid module is to be provided in which the couplings and their actuations can be integrated in a particularly axial space-saving manner.

In a generic device, this object is achieved according to the invention in that the return spring and / or the compensation chamber at least partially protrude / protrude into an axial installation space which lies radially inside the separating clutch. This means that the return spring and / or the compensation chamber are arranged radially within the separating clutch. The return spring and / or the compensation chamber are therefore at least partially arranged at the same axial height as the separating clutch. As a result, the return spring and / or the compensation chamber can be integrated into the hybrid module in a manner that is virtually neutral in terms of installation space, in particular in the axial direction.

Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

Furthermore, it is expedient if the compensating chamber is filled with oil, so that the oil pressure in the compensating chamber applies a force in the axial direction to the actuating piston which can be axially displaced to actuate the separating clutch. This counteracts the force of the actuating force. It is thus avoided in a simple manner that the clutch can be actuated unintentionally by actuating oil remaining in the actuating chamber, which is pressed radially outward by the centrifugal force caused by the rotation. The oil in the compensation chamber thus counteracts this undesirable force in the axial direction.

In a particularly preferred embodiment, the clutch can be designed as a double clutch with a first partial clutch and a second partial clutch, the first partial clutch being connectable or connected to a first transmission input shaft and the second partial clutch to a second transmission input shaft for torque transmission.

Furthermore, it is advantageous if the return spring and / or the compensation chamber are / is arranged radially within the first partial clutch and / or at least partially protrude into an axial installation space of the first partial clutch. In this way, a particularly axial space-saving solution is provided.

In a preferred embodiment, the hybrid module can have a bearing which rotatably supports the rotor carrier in the housing. According to an advantageous development, the return spring and / or the compensation chamber can be arranged radially outside the bearing and / or at least partially protrude into an axial installation space of the bearing. The space available between the disconnect clutch and the clutch bearing is therefore used to accommodate the actuation system components.

It is therefore particularly preferred if the first partial clutch, the separating clutch, the return spring, the compensation chamber and / or the bearing are arranged radially nested. This means that the components mentioned are at least partially arranged at the same axial height, only radially offset. This enables a particularly compact design.

In an advantageous embodiment, the actuating cylinder of the disconnect clutch actuation can be formed by a component that is fixed to the rotor carrier. This has the advantage that no additional component has to be installed in the existing installation space to form the actuating cylinder. The actuation system of the disconnect clutch can thus be integrated in a particularly space-saving manner, since the components already present, such as the rotor carrier, are used to form an actuation chamber. As a result, the actuation system can be made axially short.

In particular, it is advantageous if the rotor carrier-fixed component is an integral, i.e. one-material / one-piece material is part of the rotor carrier. The shape of the rotor carrier is therefore used to limit the actuation chamber.

In addition, it is expedient if the rotor carrier is formed in one part or in several parts. This allows the rotor carrier to be manufactured inexpensively, despite the more complex geometry. For example, it is advantageous if sections of the rotor carrier are welded together to form the rotor carrier.

According to a preferred embodiment, a radial outer diameter and / or a radial inner diameter of the actuating cylinder can be formed by the rotor carrier. This advantageously makes it possible for the actuating piston, which is designed, for example, as a pressure pot, to be displaced axially and radially along the outer diameter and / or the inner diameter. The actuating piston therefore runs with the rotation of the actuating cylinder, i.e. of the rotor carrier, with.

According to an advantageous development, the actuating piston can have radially outer and / or radially inner seals, preferably molded on, through which a gap between the actuating piston and the actuating cylinder is sealed. This prevents the actuation fluid / hydraulic fluid from escaping from the actuation chamber.

It is also advantageous if the actuation system of the disconnect clutch and / or the clutch is designed as a rotary feedthrough. In this way, the installation space for the actuation system can be kept comparatively small.

It is also advantageous if an opening is formed in the rotor carrier, through which opening hydraulic fluid can be introduced into an actuation chamber enclosed by the actuation cylinder and the actuation piston. In this way, the hydraulic fluid can be introduced from the stationary housing into the rotating rotor carrier.

According to an advantageous development, the hybrid module can have at least one piston ring, which is arranged in the radial direction between the housing and the rotor carrier in order to seal an intermediate space between the hydraulic line and the opening. This will make it Hydraulic fluid advantageously guided reliably from the housing into the rotor carrier.

In particular, it is advantageous if the hybrid module has an electric machine that serves as a second drive machine and is arranged coaxially to the hybrid module. In the case of coaxial electrical machines in particular, it is advantageous to utilize the installation space radially within a rotor of the electrical machine and to make it as short as possible axially.

In other words, the invention relates to a hybrid module with a triple clutch. The triple clutch has a disconnect clutch for coupling / uncoupling an internal combustion engine to a drive train / from a drive train and a double clutch with a first partial clutch and a second partial clutch. The double clutch serves to connect / disconnect the hybrid module with a transmission / from a transmission, the double clutch being arranged downstream in the torque flow relative to the disconnect clutch or the hybrid module. According to the invention, the disconnect clutch is actuated by a rotating union that is integrated in a rotor carrier of the hybrid module. The rotor carrier preferably forms an inner diameter and an outer diameter of a cylinder for actuating the separating clutch. According to the invention, a return spring and / or a compensation chamber are / are arranged radially outside a fixed bearing of the separating clutch and radially inside the separating clutch and at least one of the two partial clutches of the double clutch.

• 1 eine Längsschnittdarstellung eines erfindungsgemäßen Hybridmoduls, und
• 2 einen vergrößerten Ausschnitt des in 1 gezeigten Hybridmoduls.

The invention is explained below with the aid of drawings. Show it:

• 1 a longitudinal sectional view of a hybrid module according to the invention, and
• 2 an enlarged section of the in 1 shown hybrid module.

The figures are only schematic in nature and serve only to understand the invention. The same elements are provided with the same reference symbols.

1 and 2 show a hybrid module according to the invention 1 for a powertrain 2 a motor vehicle. The hybrid module has a housing 3 in which an input shaft 4 is rotatably mounted. The input shaft 4 is designed to input torque generated by a first drive machine, such as an internal combustion engine, into the hybrid module 1 initiate. The hybrid module 1 has a rotor carrier 5 , which is designed to initiate a torque generated by a second drive machine, such as an electric machine.

The input shaft 4 is via a disconnect clutch 6 with the rotor carrier 5 switchable connected. Via the disconnect clutch 6 can the input shaft 4 , and thus the first drive unit from the drive train 2 uncoupled (or to the drive train 2 coupled). The rotor carrier 5 is about a clutch 7 , with an output shaft 8th connected. The hybrid module 1 also has a hydraulic actuation system 9 to actuate the disconnect clutch 6 on. The actuation system 9 contains an actuating cylinder 10 and one axially in the actuator cylinder 10 slidably received actuating piston 11 , The actuating piston 11 works with the disconnect clutch 6 together that the disconnect clutch 6 with an axial displacement of the actuating piston 11 adjusted, ie opened or closed. The disconnect clutch 6 is designed as a multi-plate clutch / multi-plate clutch.

The following axial, radial and circumferential directions refer to a central axis of rotation / longitudinal axis L of the hybrid module 1 , An axial direction is therefore a direction along the axis of rotation L , under a radial direction, a direction perpendicular to the axis of rotation L and a circumferential direction along a concentric around the axis of rotation L to understand the circular line running around.

The actuation system 9 is as a rotary union 12 educated. Hydraulic fluid for actuating the separating clutch 6 is through a hydraulic line 13 in the housing 3 and through the rotor carrier 5 into an actuation chamber 14 initiated. The actuation chamber 14 is through the actuating cylinder 10 and the actuating piston 11 enclosed. When the actuation chamber is pressurized 14 with hydraulic fluid the actuating piston 11 in an axial direction of the hybrid module 1 relocated.

The actuating cylinder 10 is through the rotor carrier 5 educated. The rotor carrier 5 can be formed in one piece, even if this is not shown. In the illustrated embodiment, the rotor carrier 5 formed in several parts. The parts of the rotor carrier 5 are welded together, for example. The rotor carrier 5 thus forms a radial outer diameter 15 , a radial inner diameter 16 and an axial end face 17 of the actuating cylinder 10 out.

The actuating piston 11 when pressurized along the outside diameter 15 and along the inside diameter 16 relocated. The actuating piston 11 has seals on its radial outside and on its radial inside 18 on that the actuation chamber 14 to seal outside. The seals 18 are on the actuating piston 11 molded.

When the actuation chamber is pressurized 14 becomes the actuating piston 11 by the hydraulic fluid against a restoring force of a restoring spring 19 relocated. The actuating piston 11 acts as a pressure pot on the disconnect clutch 6 suppressed. When the actuation chamber is depressurized 14 becomes the actuating piston 11 by the restoring force of the restoring spring 19 moved back to its starting position. A compensation chamber 20 is on the actuation chamber 14 in the axial direction opposite side of the actuating piston 11 arranged. The return spring 19 is in the compensation chamber 20 arranged. In the compensation chamber 20 there is hydraulic fluid that prevents accidental actuation of the actuating piston 11 counteracts. The actuating piston 11 separates the actuation chamber 14 in the axial direction from the compensation chamber 20 , The compensation chamber 20 is on one side in the axial direction of the actuating piston 11 and on the other side in the axial direction of a centrifugal oil hood 21 limited. The centrifugal oil hood 21 is designed as a sheet metal component with a molded seal.

The rotor carrier 5 is through a first camp 22 in the housing 3 rotatably mounted. The first camp 22 lies on a radial outside of a bearing dome 23 of the housing 3 on. The first camp 22 is designed as a fixed bearing. The input shaft 4 is through a second camp 24 in the housing 3 rotatably mounted. The second camp 24 is designed as a fixed bearing.

The return spring 19 and the first camp 22 are arranged radially nested. The return spring 19 and the first camp 22 lie (at least partially) at the same height in the axial direction. That means that at least part of the return spring 19 in an axial area of the first bearing 22 by the axial outer edges of the first bearing 22 , for example an inner ring and an outer ring of the first bearing 22 , is limited, protrudes. The return spring 19 is radially outside the first bearing 22 arranged.

The compensation chamber 20 and the first camp 22 are arranged radially nested. The compensation chamber 20 and the first camp 22 lie (at least partially) at the same height in the axial direction. That means that at least part of the compensation chamber 20 in an axial area of the first bearing 22 by the axial outer edges of the first bearing 22 , for example the inner ring and the outer ring of the first bearing 22 , is limited, protrudes. The compensation chamber 20 is radially outside the first bearing 22 arranged.

The coupling 7 is as a double clutch 25 educated. The coupling 7 has a first partial clutch 26 and a second partial clutch 27 on. The first partial clutch 26 is with an as an output shaft 8th serving first transmission input shaft 28 connectable for torque transmission. The second partial clutch 27 is with an as an output shaft 8th serving second transmission input shaft 29 connectable for torque transmission. The first partial clutch 26 is designed as a multi-plate clutch / multi-plate clutch and is made by a rotating union 30 actuated. The second partial clutch 27 is designed as a multi-plate clutch / multi-plate clutch and is made by a rotating union 31 actuated.

The first partial clutch 26 and the return spring 19 are arranged radially nested. The return spring 19 and the first partial clutch 26 lie (at least partially) at the same height in the axial direction. That means that at least part of the return spring 19 in an axial area of the first partial clutch 26 by the axial outer edges of the first partial coupling 26 , for example of plates of the first partial clutch 26 , is limited, protrudes. The return spring 19 is radial within the first partial clutch 26 arranged.

The first partial clutch 26 and the compensation chamber 20 are arranged radially nested. The compensation chamber 20 and the first partial clutch 26 lie (at least partially) at the same height in the axial direction. That means that at least part of the compensation chamber 20 in an axial area of the first partial clutch 26 by the axial outer edges of the first partial coupling 26 , for example of plates of the first partial clutch 26 , is limited, protrudes. The compensation chamber 20 is radial within the first partial clutch 26 arranged.

The disconnect clutch 6 and the return spring 19 are arranged radially nested. The return spring 19 and the disconnect clutch 6 lie (at least partially) at the same height in the axial direction. That means that at least part of the return spring 19 in an axial area of the clutch 6 by the axial outer edges the disconnect clutch 6 , for example of plates of the clutch 6 , is limited, protrudes. The return spring 19 is radial inside the clutch 6 , for example radially inside an inner disk carrier of the clutch 6 , arranged.

The disconnect clutch 6 and the compensation chamber 20 are arranged radially nested. The compensation chamber 20 and the disconnect clutch 6 lie (at least partially) at the same height in the axial direction. That means that at least part of the compensation chamber 20 in an axial area of the clutch 6 by the axial outer edges of the clutch 6 , for example of plates of the clutch 6 , is limited, protrudes. The compensation chamber 20 is radial inside the clutch 6 , for example radially inside an inner disk carrier of the clutch 6 , arranged.

To actuate the disconnect clutch 6 the hydraulic fluid through the hydraulic line 13 in the housing 3 initiated. The hydraulic line 13 has a radial section through which the hydraulic fluid flows into a space between the housing 3 and the rotor carrier 5 arrives. The space is over piston rings 32 sealed. The hydraulic fluid can thus from the standing housing 3 through a radial opening 33 in the rotating rotor carrier 5 into the actuation chamber 14 reach. The actuation chamber 14 is through the rotor carrier 5 or a component that is fixed to the rotor carrier and acts as an actuating cylinder 10 serves, and the actuating piston 11 enclosed. The actuating piston 10 is therefore designed as a rotating component. When the actuation chamber is acted on 14 becomes the actuating piston 11 counter to the return spring force in the axial direction in the direction of the actuating cylinder 10 shifted away. This will separate the clutch 6 actuated.

LIST OF REFERENCE NUMBERS

1

hybrid module

2

powertrain

3

casing

4

input shaft

5

rotorarm

6

separating clutch

7

clutch

8th

output shaft

9

actuating system

10

actuating cylinder

11

actuating piston

12

Rotary union

13

hydraulic line

14

operating chamber

15

outer diameter

16

Inner diameter

17

axial end face

18

poetry

19

Return spring

20

Compensation chamber / compensation chamber

21

centrifugal oil cover

22

first camp

23

bearing dome

24

second camp

25

Double coupling

26

first partial clutch

27

second partial clutch

28

first transmission input shaft

29

second transmission input shaft

30

Rotary union

31

Rotary union

32

piston ring

33

opening

L

Rotation axis / longitudinal axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102009059944 A1 [0002]
• DE 102007008946 A1 [0003]
• DE 102017129873 A1 [0004]

Claims (10)

Hybrid module (1) for a drive train (2) of a motor vehicle, with a housing (3), an input shaft (4) mounted in the housing (3) for introducing a torque generated by a first drive machine, a rotor carrier (5) for introducing a Torque generated by a second drive machine, a separating clutch (6) for switchable rotary coupling of the input shaft (4) to the rotor support (5), a clutch (7) for rotary coupling of the rotor support (5) to an output shaft (8), with a hydraulic actuation system (9) for actuating the separating clutch (6), the actuating system (9) including an actuating cylinder (10) and an actuating piston (11) axially displaceably received in the actuating cylinder (10), with a return spring (19) for applying one of the actuating force of the actuating piston (11) counteracting restoring force, and with a compensation chamber (20) for receiving hydraulic fluid to compensate for a actuating force of the actuating piston (11) generated by the centrifugal force, characterized in that the return spring (19) and / or the compensating chamber (20) at least partially protrude / protrude into an axial installation space which lies radially inside the separating clutch (6). Hybrid module (1) after Claim 1 , characterized in that the clutch (7) is designed as a double clutch (25) with a first partial clutch (26) and a second partial clutch (27), the first partial clutch (26) having a first transmission input shaft (28) and the second Partial clutch (27) can be connected or connected to a second transmission input shaft (29) for torque transmission. Hybrid module (1) after Claim 2 , characterized in that the return spring (19) and / or the compensation chamber (20) are / is arranged radially within the first partial clutch (26) and / or the second partial clutch (27) and / or at least partially in an axial installation space of the first The partial coupling (26) and / or the second partial coupling (27) protrude. Hybrid module (1) according to one of the Claims 1 to 3 , characterized in that the hybrid module (1) has a bearing (22) which rotatably supports the rotor carrier (5) in the housing (3). Hybrid module (1) after Claim 4 , characterized in that the return spring (19) and / or the compensation chamber (20) are / is arranged radially outside of the bearing (22) and / or at least partially protrude into an axial installation space of the bearing (22). Hybrid module (1) after Claim 4 or 5 , characterized in that the first partial clutch (26), the second partial clutch (27), the separating clutch (6), the return spring (19), the compensation chamber (20) and / or the bearing (22) are arranged radially nested. Hybrid module (1) according to one of the Claims 1 to 6 , characterized in that the actuation system (9) of the separating clutch (6) and / or the clutch (7) is designed as a rotary feedthrough (12, 30, 31). Hybrid module (1) according to one of the Claims 1 to 7 , characterized in that the actuating cylinder (10) is formed by a rotor carrier-fixed component. Hybrid module (1) after Claim 8 , characterized in that a radial outer diameter (15) and / or a radial inner diameter (16) of the actuating cylinder (10) is formed by the rotor carrier (5). Hybrid module (1) according to one of the Claims 1 to 9 , characterized in that the hybrid module (1) has an electric machine serving as a second drive machine and arranged coaxially to the hybrid module (1).

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