阅读说明：本技术 用于冷却油的切换单元和具有切换单元的混合动力模块 (Switching unit for cooling oil and hybrid module having a switching unit ) 是由 斯特芬·莱曼 马克·黑尔费尔 迪尔克·霍夫施泰特尔 于 2018-04-12 设计创作，主要内容包括：本发明涉及一种用于将冷却油输送到两个离合器(2、3)的切换单元(1),这两个离合器能选择性地闭合,以便将转矩从驱动轴(4)要么传递到第一从动轴(5)上要么传递到第二从动轴(6)上,其中,切换单元(1)具有滑块(7)和与之起耦合作用的流体通道(8、9、10、11、12),这些流体通道彼此如下这样地置于作用关系中,即,使得切换单元(1)依赖于这两个离合器中的哪个离合器与第一从动轴(5)或第二从动轴(6)传递转矩地连接来将冷却油输送给所选出的离合器(2、3)。本发明还涉及一种用于机动车的传动系的混合动力模块(13),该混合动力模块具有两个离合器(2、3)和这种切换单元(1)。(The invention relates to a switching unit (1) for supplying cooling oil to two clutches (2, 3) which can be selectively closed in order to transmit a torque from a drive shaft (4) either to a first output shaft (5) or to a second output shaft (6), wherein the switching unit (1) has a slide (7) and fluid channels (8, 9, 10, 11, 12) which are coupled thereto and which are brought into operative relationship with one another in such a way that the switching unit (1) supplies the cooling oil to a selected clutch (2, 3) depending on which of the two clutches is connected to the first output shaft (5) or the second output shaft (6) in a torque-transmitting manner. The invention further relates to a hybrid module (13) for a drive train of a motor vehicle, comprising two clutches (2, 3) and such a switching unit (1).)

1. A switching unit (1) for supplying cooling oil to two clutches (2, 3) which can be selectively closed in order to transmit torque from a drive shaft (4) either to a first output shaft (5) or to a second output shaft (6), characterized in that the switching unit (1) has a slide (7) and fluid channels (8, 9, 10, 11, 12) which are coupled to the slide and are brought into operative relationship with one another in such a way that the switching unit (1) connects the selected clutch (2, 3) to the first output shaft (5) or the second output shaft (6) in a torque-transmitting manner.

2. Switching unit (1) according to claim 1, characterised in that the switching unit (1) is designed such that it delivers cooling oil to a clutch (2, 3) connected in torque-transmitting manner to the first output shaft (5) or the second output shaft (6).

3. The switching unit (1) according to claim 1 or 2, characterized in that the slide (7) is mounted and can be actuated in such a way that it is forcibly displaced in dependence on the delivery of hydraulic fluid for actuating the respective clutch (2, 3) in such a way that it selectively releases the delivery of cooling oil to the actuated clutch (2, 3).

4. The shift unit (1) according to one of claims 1 to 3, characterized in that the shift unit (1) is designed such that the slide (7) is moved by a first operating oil pressure for operating a first clutch (2) of the two clutches (2, 3) or by a second operating oil pressure for operating a second clutch (3) of the two clutches (2, 3) such that cooling oil is supplied to the first clutch (2) or the second clutch (3).

5. The switching unit (1) according to one of claims 1 to 4, characterized in that the switching unit (1) has a defined leakage amount, so that in each switching position of the clutches (2, 3) a smaller amount of cooling oil is conducted to the two clutches (2, 3).

6. The switching unit (1) according to claim 4 or 5, wherein the channel (10, 11, 12) for carrying cooling oil is fluidly separated from the channel (7, 8) for carrying operating oil.

7. The switching unit (1) according to any one of claims 4 to 6, characterised in that the slider (7) can be displaced into a first switching position in which cooling oil is led to the first clutch (2) and the second clutch (3) is fluidly separated from a coolant flow.

8. The switching unit (1) according to any one of claims 4 to 7, characterised in that the slider (7) is displaceable into a second switching position in which cooling oil is conducted to the second clutch (3) while the first clutch (2) is fluidly separated from a coolant flow.

9. Hybrid module (13) for a drive train of a motor vehicle, having two clutches (2, 3) and a switching unit (1) according to one of claims 1 to 8.

10. Hybrid module (13) according to claim 9, characterized in that the clutches (2, 3) are configured as normally open clutches or as normally closed clutches.

Technical Field

The invention relates to a switching unit for supplying cooling oil to two (partial) clutches, for example a dual clutch, which can be selectively closed in order to transmit torque from a common drive shaft either to a first output shaft or to a second output shaft. That is, always only one of the two clutches is closed, i.e. transmitting torque, while the other of the two clutches is open. The invention also relates to a hybrid module for a drivetrain of a motor vehicle, in particular having a P1 hybrid, i.e. a hybrid in which an electric machine is fastened to a crankshaft of an internal combustion engine, the P1 hybrid having two (sub) clutches and such a switching unit.

Background

Clutch devices with cooling oil switching units are already known from the prior art. For example, DE 102016202656 a1 discloses a clutch device having: first and second friction members rotatably supported about a rotation axis; hydraulic actuating means for axially pressing the friction elements towards each other; wherein the actuating device comprises a hydraulic working chamber with a first piston which acts axially on one of the friction elements; a valve for controlling the flow of fluid to the friction elements when the friction elements are pressed against each other; a second piston for actuating the valve, wherein the second piston is designed to open the valve when the pressure in the hydraulic supply line to the hydraulic working chamber increases, wherein the second piston is designed to close a fluid connection between the hydraulic supply line and the hydraulic working chamber during the closing of the valve.

However, the prior art always has the disadvantage that when such a cooling oil device is installed in a double clutch, the thermal cooling of the clutch is insufficient when both partial clutches are assigned an equal, half amount of cooling oil. I.e. a significant increase in the amount of cooling oil is required. Therefore, such a cooling oil device cannot be applied to the conventional dual clutch of the related art.

Disclosure of Invention

The object of the invention is therefore to avoid or at least reduce the disadvantages of the prior art. In particular, a cooling oil distribution which can be applied to a double clutch and is improved should be developed. In particular, a desirable cooling oil distribution for a hybrid module having a dual clutch, which requires particularly little cooling oil, should be developed.

In a generic device, the object of the invention is achieved according to the invention in that the switching unit has a slide and a fluid channel which is coupled thereto and which are brought into operative relationship with one another in such a way that the switching unit delivers cooling oil to the selected clutch depending on which of the two clutches is connected to the first output shaft or the second output shaft in a torque-transmitting manner. That is, the switching unit for cooling fluid distribution distributes the cooling fluid between the two clutches depending on the open/closed states of the two clutches.

This has the advantage that only the clutch which is actuated, i.e. closed, in each case is cooled, or can be supplied to a greater extent with cooling fluid or cooling oil. It is thereby possible to achieve an improved cooling result for the double clutch with a smaller cooling oil quantity. Thus, efficient cooling can also be achieved with a smaller cooling oil quantity, which results in a higher thermal load for the clutch or smaller pump losses.

Advantageous embodiments are claimed in the dependent claims and are set forth in detail below.

Furthermore, the switching unit is preferably designed such that it delivers cooling oil to a clutch connected to the first output shaft or the second output shaft in a torque-transmitting manner. That is, the switching unit supplies the cooling oil to the first clutch when the first clutch is closed, and supplies the cooling oil to the second clutch when the second clutch is closed. Conversely, this also means that the switching unit does not supply cooling oil to the first clutch when the first clutch is disengaged, and does not supply cooling oil to the second clutch when the second clutch is disengaged. The coolant distribution is thus adapted to the coolant requirement, so that only the clutch transmitting torque, i.e. in the friction lock (reibscluss), always has to be cooled. If the clutch is disengaged, there is no frictional engagement between the two clutch parts, so that no frictional heat occurs.

Furthermore, it is advantageous if the slide is mounted and can be actuated in such a way that it is forcibly displaced, depending on the supply of hydraulic fluid/operating oil for actuating the respective clutch, in such a way that it selectively releases the supply of cooling oil to the actuated, i.e. closed, clutch. In an advantageous manner, the actuation of the clutch is therefore hydraulically coupled to the control of the desired oil distribution, so that no additional control is required for optimal distribution of the cooling oil to the actuated clutch.

It is also advantageous if the shifting unit is designed such that the slide is displaced by a first operating oil pressure for actuating a first of the two clutches or by a second operating oil pressure for actuating a second of the two clutches in such a way that cooling oil is supplied to the first clutch or the second clutch. The shifting unit is therefore hydraulically connected to a channel for the actuation oil pressure for actuating the clutch, so that a forced displacement of the slide of the shifting unit is achieved. The error susceptibility is also reduced since no additional control system has to be used, since the clutch is also deactivated without the actuation oil pressure, i.e. the switching unit for the cooling oil is also activated with the existing actuation oil pressure.

An advantageous embodiment is distinguished in that the switching unit has a defined leakage quantity, so that a smaller cooling oil quantity is conducted to both clutches in each switching position of the clutches. In this way, even in the event of a clutch disconnection, a reduced residual amount of cooling oil flows to the disconnected clutch, so that in particular the bearing location there is sufficient cooling.

It is additionally advantageous if the channel for conveying the cooling oil is fluidically separated from the channel for conveying the operating oil. Thereby it is excluded that a leak in one of the channels does not affect the functionality of the other of the channels. Thereby also precluding that the cooling oil may mix with the handling oil.

It is also expedient if the slide/piston slide can be displaced into a first switching position in which the cooling oil is conducted to the first clutch, while the second clutch is fluidically separated from the coolant, except for a small leakage. The slide is therefore designed such that, for example, when the first clutch is actuated, i.e., activated, the slide is moved in such a way that a large part of the cooling oil quantity flows therein into the distribution channel provided for the first clutch. Here, the movement of the slide is obtained by applying the operating oil pressure for the first clutch.

It is also advantageous if the slide can be displaced into a second switching position in which the cooling oil is conducted to the second clutch, while the first clutch is fluidly separated from the coolant flow, except for a smaller leakage amount. Thus, when the first clutch is loaded with the operating oil pressure, i.e. closed, the slide is in the first switching position, and when the second clutch is loaded with the operating oil pressure, i.e. closed, the slide is in the second switching position. This applies to clutches implemented as normally open clutches.

The object of the invention is also achieved by using a hybrid module for a drive train of a motor vehicle (KFZ), which has two partial clutches and a switching unit according to the invention.

It is possible here for the clutch to be designed as a normally open clutch or as a normally closed clutch. If the clutch is implemented as a normally open clutch, the flow of cooling oil is diverted to the first clutch when the operating oil is diverted to the first clutch. If the clutch is configured as a normally closed clutch, the cooling oil is diverted to the first clutch when the second clutch is charged with the operating oil pressure, since charging with the operating oil pressure results in the disconnection of the second clutch.

In other words, the invention relates to a switching unit for improving the coolant distribution in a hybrid module. The hybrid module has at least two fluid-cooled or oil-cooled clutches, wherein the cooling fluid or the cooling oil is distributed to a greater extent to one or the other of the clutches which are respectively actuated, i.e. closed. The cooling fluid is distributed by means of a control piston/slide/piston slide which is forcibly displaced by the actuating fluid pressure applied to close the respective clutch. The clutches can be those which are open (normally open) in the rest position and/or closed (normally closed) in the rest position.

In such hybrid modules, two oil-cooled clutches are present, wherein, for actuating/closing one of the two partial clutches, an actuating oil pressure is applied to one of the partial clutches or to the other partial clutch by means of an actuator or a pump. In order to cool the clutches, the cooling oil is supplied to one or the other of the partial clutches via a separate channel. Here, the pressure oil and the cooling oil for the actuation are transferred to the oil distribution unit via the channels. Since, with a uniform distribution of the cooling oil to the clutches, only half the amount of cooling oil is available per partial clutch, a thermally unfavorable state occurs, since only one of the two clutches respectively introduces frictional energy, i.e. transmits torque.

A slide is integrated in the oil distribution unit/switching unit of the clutch, which can be acted upon on both sides for the actuation oil pressure of the first clutch or the second clutch. When the first clutch is closed, the slide is moved by the actuation oil pressure for the first clutch in such a way that a large part of the cooling oil quantity flows into a distribution channel provided for the first clutch. Due to the defined leakage amount, it is possible to ensure that a reduced residual amount always flows in the direction of the second clutch and the bearing position located there and other components. When the second clutch is then activated, the slide is moved in such a way that the majority of the cooling oil flows therein to the distribution channel provided for the second clutch. Thus, efficient cooling is achieved even with a smaller amount of cooling oil, which results in a higher thermal load for the clutch or lower pump losses.

Drawings

The invention is subsequently elucidated with the aid of the drawings. Wherein:

fig. 1 shows a cross-sectional view of a hybrid module according to the invention with a switching unit according to the invention;

fig. 2 shows the switching unit in a first switching position; and is

Fig. 3 shows the switching unit in a second switching position.

The drawings are merely schematic and serve only to understand the invention. Like elements are denoted by like reference numerals.

Detailed Description

Fig. 1 shows a switching unit 1 for supplying cooling oil to a first clutch 2 and a second clutch 3, which can be selectively closed in order to transmit a torque from a common drive input shaft 4 either to a first output shaft 5 or to a second output shaft 6. The first clutch 2 can connect the drive shaft 4 to the first output shaft 5 in a torque-transmitting manner, while the second clutch 3 can connect the drive shaft 4 to the second output shaft 6.

The switching unit 1 has a slide 7 and fluid channels 8, 9, 10, 11, 12 coupled thereto, which are brought into operative relationship with one another in such a way that the switching unit 1 delivers cooling oil to the selected clutch 2, 3 depending on which of the two clutches 2, 3 is connected in torque-transmitting connection with the first output shaft 5 or the second output shaft 6.

The two clutches 2, 3 are part of a hybrid module 13. In the hybrid module 13, a torsional vibration damper 14 is fastened to a crankshaft, which serves as the drive shaft 4, so that the motor torque is transmitted to a rotor unit 15 of the hybrid module 13 via the plug toothing 16. The hybrid module 13 contains an electric machine 17 having a stator 18 and a rotor 19 arranged concentrically with the stator. The rotor 19 is fixed in a rotationally fixed manner to the rotor unit 15. Two clutches 2, 3 are integrated in the rotor unit 15, wherein the clutches 2, 3 are cooled with oil. The rotor unit 15 is supported in a housing 21 of the hybrid module 13 via a first rolling bearing 20. The rotor unit 15 is supported on the hollow shaft 22 via a second rolling bearing.

The switching unit 1 has a first control oil pressure supply line 8, which is designed to supply control oil for controlling the first clutch 2, so that the first clutch 2 is acted upon with control oil pressure and is thus controlled. The switching unit 1 also has a second control oil pressure supply line 9, which supplies control oil to the second clutch 3, so that the second clutch 3 is acted upon with control oil pressure and is thus actuated. In the switching unit 1 there is also a cooling oil feed channel 10 which introduces cooling oil into the switching unit 1.

The switching unit 1 also has a first cooling oil channel 11, which is connected to the first clutch 2 and is designed to supply cooling oil to the first clutch 2. In addition, the switching unit 1 also has a second cooling oil channel 1, which is connected to the second clutch 3 and is designed to supply cooling oil to the second clutch 3.

Fig. 2 shows the switching unit 1 in a first switching position. In the first switching position, the first clutch 2 is loaded with the actuation oil pressure, so that the first clutch 2 is closed. By means of the operating oil pressure in the first operating oil pressure supply channel 8, the slide 7 of the switching unit 1 is moved in the switching unit 1 in such a way that the cooling oil supply channel 10 is connected to the first cooling oil channel 11, so that the first clutch 2 can be supplied with cooling oil.

When the second clutch 3 is supplied with the operating oil pressure, the operating oil pressure acts on the slide 7 of the switching unit 1 via the second operating oil pressure supply channel 9 in such a way that it is displaced in such a way that the cooling oil supply channel 10 is connected to the second cooling oil channel 12, so that the second clutch 3 can be supplied with cooling oil. Thereby, the slider 7 of the switching unit 1 is thus moved into the second switching position (see fig. 3), and the second clutch 3 is supplied with cooling oil. The slide 7 of the switching unit 1 can therefore only be displaced in such a way that the cooling oil supply channel 10 is always connected to one of the first and second cooling oil channels 11, 12 and is separated from the other of the first and second cooling oil channels 11, 12. Therefore, the slipper 7 of the switching unit 1 selectively blocks the delivery of the cooling oil to the disengaged clutches 2, 3.

Depending on whether the first control oil pressure supply passage 8 or the second control oil pressure supply passage 9 is charged with the control oil pressure, the first cooling oil passage 11 or the second cooling oil passage 12 is connected to the cooling oil supply passage 10. If the clutches 2, 3 are open (normally open) in the rest state, the actuation of the first clutch 2 results in a cooling oil feed to the first clutch 2, while the actuation of the second clutch 3 results in a cooling oil feed to the second clutch 3. If the clutches 2, 3 are closed (normally closed) in the rest state, the actuation of the first clutch 2 results in a cooling oil feed to the second clutch 3, while the actuation of the second clutch 3 results in a cooling oil feed to the first clutch 2.

List of reference numerals

1 switching unit

2 first clutch

3 second clutch

4 drive shaft

5 first driven shaft

6 second driven shaft

7 sliding block

8 first operating oil pressure delivery passage

9 second control oil pressure delivery passage

10 cooling oil delivery passage

11 first cooling channel

12 second cooling channel

13 hybrid module

14 torsion damper

15 rotor unit

16 plug tooth

17 electric machine

18 stator

19 rotor

20 first rolling bearing

21 casing

22 hollow shaft