DE102017109095A1

DE102017109095A1 - Actuator for a clutch

Info

Publication number: DE102017109095A1
Application number: DE102017109095.9A
Authority: DE
Inventors: Lászlo Mán; Peter Greb; Viktor Franz
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2017-04-27
Filing date: 2017-04-27
Publication date: 2018-10-31

Abstract

The invention relates to an actuator with a housing, wherein in the housing a drive unit, a donor-piston-cylinder unit and a slave-piston-cylinder unit are arranged, wherein the donor-piston-cylinder unit has a first pressure chamber with an along an axial direction therein the drive unit has displaceable master piston, wherein the slave piston-cylinder unit has a second pressure chamber with a displaceable therein by a displacement of the master piston slave piston, wherein the first pressure chamber is connected to the second pressure chamber via a connecting line.

Description

The invention relates to an actuator with a housing, wherein in the housing, a drive unit and at least one donor piston-cylinder unit are arranged, wherein the donor piston-cylinder unit has a first pressure chamber with a displaceable therein along an axial direction by the drive unit master piston.
The actuator is in particular for actuating a clutch, for. B. a friction clutch, a motor vehicle. The drive unit is in particular a rotor of an electric motor, wherein an actuating lever of a friction clutch can be actuated via a conversion of the rotational movement of the rotor into a translatory movement of a piston. The drive unit may also include a transmission, for. B. a planetary gear. The gear is then arranged between the rotor and the piston. Furthermore, the drive unit can move a master piston of a transmitter-piston-cylinder unit in a translatory manner, wherein the transmitter-piston-cylinder unit is connected via a connecting line with a slave-piston-cylinder unit. By pressing the master piston of the slave piston is displaced, which actuates the friction clutch via an actuating lever.
The friction clutch is provided in particular for a drive train of a motor vehicle. The friction clutch is arranged in particular between a drive device of the motor vehicle and a transmission and transmits a torque for driving the motor vehicle.
The actuator is in particular part of an actuator and replaces z. B. the function of a clutch pedal, by the previously z. B. a master cylinder was pressed, which presses on a fluid column, which in turn actuates a mounted in a friction clutch slave cylinder and thus the friction clutch.
When designing the actuators, it is important the enormously large overall ratio, from a contact pressure of the clutch linings to a torque of the drive unit, z. As an electric machine to realize in the right places. If the translation is realized, for example, in the friction clutch (lever spring), although the force level in the track decreases to the actuators, but the strokes are longer. This means that when choosing a variant, it has to be checked in many places which consequences the force level prevailing there and the required lifting distances have. From the maximum permissible pressure and the maximum permissible forces on the engagement bearings, the piston surfaces in the slave cylinder arise. Often a compromise must be found here for reasons of space. From the key data of the drive unit, z. B. an electric machine (maximum speed, maximum torque and positioning accuracy) results in a total translation for which a suitable design must be found. In principle, two translations are already available to realize this overall translation. On the one hand the translation of the hydrostatic path, which is defined by the ratio of the piston surfaces of slave to master cylinder, and on the other hand, the gear ratio, which converts the rotational movement of a motor shaft of the drive unit in a linear lifting movement (eg the master piston). For cost and efficiency reasons, no further translation stage is provided.
So far, corresponding pairs of drive units, sender-piston-cylinder units and slave-piston-cylinder units have been selected for each application.
From the WO 2015/149777 A1 For example, an actuator with a planetary roller screw (PWG) is known. In this case, a rotational movement generated by an electric motor via a Planetenwälzgetriebe is converted into a movement along an axial direction. Thus, the piston can be displaced over the electric motor for actuating the slave cylinder and the friction clutch along the axial direction.
There is the constant task to make components for actuators compact. For this purpose, various components can be summarized and z. B. be provided integrated in a common housing. However, such integration of multiple components usually reduces the number of use cases for which this arrangement is appropriate.
Proceeding from this, the object of the present invention is to at least partially solve the problems known from the prior art. In particular, an actuator is to be proposed, which is as flexible as possible. The actuator should therefore be usable for different actuators.
The object is achieved by an actuator with the features of claim 1. Further advantageous embodiments of the invention are specified in the dependent formulated claims. The individually listed in the dependent formulated features can be combined in a technologically meaningful way and can define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in detail in the description, wherein further preferred embodiments of the invention are shown.
It is proposed an actuator with a housing, wherein in the housing, a drive unit, a donor-piston-cylinder unit and a slave-piston-cylinder unit are arranged. The transmitter-piston-cylinder unit has a first pressure chamber with a master piston displaceable therein along an axial direction by the drive unit, the slave-piston-cylinder unit having a second pressure chamber with a slave piston displaceable therein by a displacement of the master piston. The first pressure chamber is connected to the second pressure chamber via a connecting line.
So here are usually arranged separately separated components donor piston-cylinder unit and slave piston-cylinder unit arranged in a common housing. In this case, the drive unit for actuating the transmitter-piston-cylinder unit is also arranged in the housing.
In particular, the actuator proposed here can be provided as a replacement for an actuator which comprises only a drive unit and an actuating piston displaceable by the drive unit. If a different overall ratio is used here, only the drive unit could be exchanged. The actuator proposed here allows the use of the identical drive unit, the overall ratio being realized via an adapted diameter of a slave piston.
The drive unit comprises in particular a transmission, for. B. a planetary gear. Further, the drive unit (additionally) comprise a rotor and a stator of an electric machine, wherein an actuating lever of a friction clutch can be actuated via a conversion of the rotational movement of the rotor into a translational movement of the master piston via the transmission. The gearbox is arranged between rotor and master piston. By pressing the master piston of the slave piston is displaced, in particular actuates the friction clutch via an actuating lever.
Preferably, the transmitter-piston-cylinder unit and the slave-piston-cylinder unit are arranged side by side and overlap each other along the axial direction. In particular, both cylinder units extend along the axial direction.
Preferably, the transmitter-piston-cylinder unit (in relation to the direction of gravity in the installed state of the actuator) is arranged above the slave-piston-cylinder unit, so that the second pressure chamber via the connecting line and the first pressure chamber can be vented. Thus, a possibly present in the second pressure chamber gas inclusion escape via the connecting line to the first pressure chamber.
In particular, the donor piston-cylinder unit and the slave-piston-cylinder unit are arranged axially parallel to each other. In particular, the two cylinder units extend to each other at an angle of zero to at most 45 degrees.
In particular, a pressure sensor is arranged in the connecting line. The pressure sensor is provided for determining the pressure of the fluid present in the connecting line.
Preferably, the connection line is arranged completely integrated in the housing. In particular, therefore, the connection line is formed exclusively by the housing or comprises.
In particular, the housing comprises a first housing part which can be connected to one another and a second housing part, wherein the drive unit is arranged in the first housing part (and in particular also the pressure sensor), wherein in the second housing part the transmitter-piston-cylinder unit and the slave-piston-cylinder unit are arranged are. In particular, the connecting line is formed exclusively by the first housing part and the second housing part, so it is arranged completely integrated in the housing.
In particular, the slave piston is hollow and has a cavity in which a Betätigungspleuel is arranged articulated relative to the slave piston. In particular, an actuating lever for actuating a friction clutch is contacted and actuated via the actuating connecting rod.
It is further proposed a double actuator, comprising two actuators described above, which are arranged side by side in a common housing, wherein a first actuator, a first slave-piston-cylinder unit with a first slave piston and a second actuator, a second slave-piston-cylinder unit with a having second slave piston. About the first slave piston, a first actuating lever of a dual clutch and the second slave piston, a second actuating lever of the double clutch can be actuated.
Further, a method of using an actuator as described above proposed, wherein in each case the first housing part is used with the drive unit arranged therein for a first application with a required first overall translation and for a second application with a required second overall translation. For the first application, a second housing part with the donor piston-cylinder unit and a first slave-piston-cylinder unit and for the second application, another second housing part with the donor-piston-cylinder unit and a second slave-piston-cylinder unit is used. The first slave-piston-cylinder unit differs from the second slave-piston-cylinder unit at least by a diameter of the respective slave piston.
The total ratio is, for example, the ratio of a required contact pressure of the clutch linings to a torque of the drive unit, z. B. an electric machine.
It is therefore proposed that for different applications, in particular a always the same first housing part is used with a same drive unit. The design of the encoder-piston-cylinder unit remains unchanged for both applications. Thus, the coupling of the drive unit and the encoder-piston-cylinder unit can be taken unchanged. Here, (only) the slave-piston-cylinder unit is adapted to the changed application. By adjusting the diameter of the slave piston, the overall ratio can be adjusted as needed.
In order for a compact design of an actuator can be provided, on the other hand, the greatest possible flexibility of the actuator with respect to the possible applications can be ensured by the replacement of simple components.
The comments on the actuator apply equally to the double actuator and the method and vice versa. The method is also transferable to the double actuator. Thus, via a replacement of a second housing part, a desired overall ratio of each actuator of the double actuator can also be produced here.
A reservoir with a volume for a fluid, which is arranged in the pressure chambers of the cylinder units, can also be embodied integrated in the housing or can be provided as a connection part.
By way of precaution, it should be noted that the numerical terms used here ("first", "second",...) Primarily (only) serve to distinguish a plurality of similar objects, variables or processes, ie in particular no dependence and / or order of these objects, quantities or mandate processes to one another. If a dependency and / or order are required, this is explicitly stated here or it obviously results for the person skilled in the art when studying the concretely described embodiment.
The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the invention should not be limited by the embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and to combine them with other components and findings from the present description and / or figures. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. The same reference numerals designate the same objects, so that explanations of other figures can be used if necessary. Show it:

1 a first side view of a known actuator;
2 a second side view of the known actuator;
3 a side view of an actuator;
4 : a frontal view of the actuator behind 3 ;
5 : a side view of the actuator after 3 and 4 on average;
6 a slave piston-cylinder unit of the actuator after 5 on average; and
7 : a frontal view of a double actuator with a double clutch.

1 shows a first side view of a known actuator 1 , 2 shows a second side view of the known actuator 1 , The 1 and 2 will be described together below.
The actor 1 includes a housing 2 , wherein in a first part housing 13 of the housing 2 a drive unit 3 is arranged. In a second part housing 14 is a transmitter-piston-cylinder unit 4 arranged. This sender-piston-cylinder unit 4 is via a connection line 11 with a slave-piston-cylinder unit 5 (not shown here), which is arranged outside the housing, connectable. A reservoir 25 with a volume 26 for a fluid 27 in that in the pressure space of the sender-piston-cylinder unit 4 is arranged, is provided here as a connection part.
3 shows a side view of an actuator 1 , 4 shows a frontal view of the actuator 1 to 3 , 5 shows a side view of the actuator 1 to 3 and 4 on average. 6 shows a slave-piston-cylinder unit 5 of the actor 1 to 5 on average. The 3 to 6 will be described together below.
The actor 1 has a housing 2 on, being in the housing 2 a drive unit 3 , a donor-piston-cylinder unit 4 and a slave-piston-cylinder unit 5 are arranged. The encoder-piston-cylinder unit 4 has a first pressure chamber 6 with one in an axial direction 7 through the drive unit 3 displaceable master piston 8th on, where the slave-piston-cylinder unit 5 a second pressure chamber 9 with a therein by a shift of the master piston 8th displaceable slave piston 10 having. The first pressure room 6 is with the second pressure chamber 9 over a connecting line 11 connected.
Here are the usually separated components arranged encoder-piston-cylinder unit 4 and slave piston-cylinder unit 5 in a common housing 2 arranged. In this case, the drive unit 3 for actuating the transmitter-piston-cylinder unit 4 also in the case 2 arranged.
The encoder-piston-cylinder unit 4 and the slave-piston-cylinder unit 5 are arranged side by side and overlap along the axial direction 7 each other. Both cylinder units 4 . 5 extend along the axial direction 7 ,
The encoder-piston-cylinder unit 4 is (in relation to the direction of gravity 28 in the installed state of the actuator 1 ) above the slave-piston-cylinder unit 5 arranged so that the second pressure chamber 9 over the connecting line 11 and the first pressure room 8th is vented. This can be a possibly in the second pressure chamber 9 present gas enclosure via the connecting line 11 to the first pressure room 8th escape.
The encoder-piston-cylinder unit 4 and the slave-piston-cylinder unit 5 are arranged axially parallel to each other. In the connection line 11 is a pressure sensor 12 arranged. The pressure sensor 12 is to determine the in the connecting line 10 present pressure of the fluid 27 intended.
The connection line 11 is completely in the housing 2 integrated arranged. The housing 2 includes an interconnected first housing part 13 and a second housing part 14 , wherein in the first housing part 13 the drive unit 3 is arranged and also the pressure sensor 12 , wherein in the second housing part 14 the encoder-piston-cylinder unit 4 and the slave-piston-cylinder unit 5 are arranged. The connection line 11 is exclusively by the first housing part 13 and the second housing part 14 is formed, so it is completely in the housing 2 integrated arranged.
The slave piston 10 is hollow and has a cavity 15 on, in which a Betätigungspleuel 16 opposite the slave piston 11 is arranged articulated. About the Betätigungspleuel 16 in particular, an actuating lever 20 . 22 contacted and operated for actuating a friction clutch. The slave piston 10 has a diameter 23 on.
7 shows a frontal view of a double actuator 24 with a double clutch 21 , The double actuator 24 has two actuators described above 1 . 17 on, side by side in a common housing 2 are arranged, wherein a first actuator 1 a first slave-piston-cylinder unit 5 with a first slave piston 10 and a second actor 17 a second slave piston-cylinder unit 18 with a second slave piston 19 having. About the first slave piston 10 is a first operating lever 20 a double clutch 21 and over the second slave piston 19 a second operating lever 22 the double clutch 21 actuated.
LIST OF REFERENCE NUMBERS

1: actuator
2: casing
3: drive unit
4: Encoder piston-cylinder unit
5: Slave piston cylinder unit
6: first pressure chamber
7: axial direction
8th: master piston
9: second pressure chamber
10: slave piston
11: connecting line
12: pressure sensor
13: first housing part
14: second housing part
15: cavity
16: Betätigungspleuel
17: second actor
18: second slave piston-cylinder unit
19: second slave piston
20: first operating lever
21: Double coupling
22: second operating lever
23: diameter
24: Doppelaktor
25: reservoir
26: volume
27: fluid

QUOTES INCLUDE IN THE DESCRIPTION
This list of the documents listed by the applicant has been generated automatically and is included solely 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.
Cited patent literature

WO 2015/149777 A1 [0007]

Claims

Actuator (1) with a housing (2), wherein in the housing (2) a drive unit (3), a donor-piston-cylinder unit (4) and a slave-piston-cylinder unit (5) are arranged, wherein the encoder Piston-cylinder unit (4) has a first pressure chamber (6) with an along an axial direction (7) by the drive unit (3) displaceable master piston (8), wherein the slave piston-cylinder unit (5) has a second pressure chamber (9 ) with a displaceable therein by a displacement of the master piston (8) slave piston (10), wherein the first pressure chamber (6) with the second pressure chamber (9) via a connecting line (11) is connected.
Actuator (1) to Claim 1 wherein the transmitter-piston-cylinder unit (4) and the slave-piston-cylinder unit (5) are arranged side by side and overlap each other along the axial direction (7).
Actuator (1) to Claim 2 , wherein the donor piston-cylinder unit (4) above the slave-piston-cylinder unit (5) is arranged, so that the second pressure chamber (9) via the connecting line (11) and the first pressure chamber (6) is vented.
Actuator (1) according to one of the preceding claims, wherein the transmitter-piston-cylinder unit (4) and the slave-piston-cylinder unit (5) are arranged axially parallel to each other.
Actuator (1) according to one of the preceding claims, wherein in the connecting line (11) a pressure sensor (12) is arranged.
Actuator (1) according to one of the preceding claims, wherein the connecting line (11) is arranged completely integrated in the housing (2).
Actuator (1) according to one of the preceding claims, wherein the housing (2) comprises a first housing part (13) which can be connected to one another and a second housing part (14), wherein the drive unit (3) is arranged in the first housing part (13) in the second housing part (14), the donor-piston-cylinder unit (4) and the slave-piston-cylinder unit (5) are arranged.
Actuator (1) according to one of the preceding claims, wherein the slave piston (10) is hollow and has a cavity (15) in which a Betätigungspleuel (16) relative to the slave piston (10) is articulated.
Double actuator (24) comprising two actuators (1, 17) according to one of the preceding claims, which are arranged side by side in a common housing (2), wherein a first actuator (1) at least a first slave-piston-cylinder unit (5) with a first slave piston (10) and a second actuator (17) at least one second slave piston-cylinder unit (18) with a second slave piston (19), wherein on the first slave piston (10) a first actuating lever (20) of a dual clutch (21 ) and via the second slave piston (19), a second actuating lever (22) of the dual clutch (21) is actuated.
Method for using an actuator (1) according to one of the preceding Claims 7 and 8th , wherein for a first application with a required first overall translation and for a second application with a required second overall translation in each case the first housing part (13) is arranged with the drive unit (3) arranged therein, wherein for the first application, a second housing part (14) with the donor piston-cylinder unit (4) and a first slave-piston-cylinder unit (5) with a first slave piston (10) and for the second application, another second housing part (14) with the donor-piston-cylinder unit (4) and a second slave piston-cylinder unit (18) with a second slave piston (19) is used; wherein the first slave-piston-cylinder unit (5) differs from the second slave-piston-cylinder unit (18) at least by a diameter (23) of the respective slave piston (10, 19).