WO2017202414A1

WO2017202414A1 - Actuator for an operating device of a friction clutch

Info

Publication number: WO2017202414A1
Application number: PCT/DE2017/100404
Authority: WO
Inventors: Sebastian Honselmann; Rebecca Ruppert; Erik Hammer
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2016-05-23
Filing date: 2017-05-12
Publication date: 2017-11-30
Also published as: DE112017002614A5; DE102016208823A1

Abstract

The invention relates to an actuator for an operating device of a friction clutch, wherein the operating device has at least one master cylinder that can be operated by a clutch pedal, the actuator, and a slave cylinder provided to operate the friction clutch, which are connected to one another via pressure lines, wherein the slave cylinder can be operated by the master cylinder and by the actuator. The actuator has at least one housing and, arranged therein, a first piston which can be operated by an actuator drive, and a second piston which can be operated by the master cylinder, wherein the actuator drive has two threaded spindles each having a spindle nut, wherein both spindle nuts are connected at least to the first piston to operate the first piston.

Description

Actuator for an actuator of a friction clutch

The present invention relates to an actuator for an actuating device of a friction clutch, in particular for a drive train of a motor vehicle. The friction clutch is arranged in particular between a drive unit of the motor vehicle and a transmission.

The actuator comprises at least one operable by a clutch pedal master cylinder, the actuator and a provided for actuating the friction clutch slave cylinder, which are interconnected via pressure lines, wherein the slave cylinder is actuated by the master cylinder and by the actuator. The pressure lines are filled with a hydraulic fluid (eg an oil), so that by pressing z. B. the master cylinder of the slave cylinder actuated and thus open the friction clutch or is closable.

For actuating friction clutches are actuators with a

Master cylinder and a slave cylinder known via pressure lines

connected to each other. In motor vehicles with manual transmission, the master cylinder by means of a clutch pedal by a driver of

Motor vehicle operated. As a result, the fluid is displaced from the master cylinder via the pressure line to the slave cylinder, which disengages the friction clutch and / or engages. The slave cylinder may be, for example, a CSC (concentric slave cylinder). To reduce CO 2 emissions from motor vehicles with manual transmission

Actuators for the friction clutch are known which have an additional actuator. This actuator allows a so-called "sailing function", by means of which the drive unit of the motor vehicle can be switched off by opening the friction clutch during the rolling of the motor vehicle

Slave cylinder so connected to the master cylinder and the actuator, that both the master cylinder and the actuator to drive the slave cylinder and so the

Can operate friction clutch. Preferably, the master cylinder and the actuator are arranged in series, so that a transfer between the actuator and the Master cylinder and vice versa is possible. As a result, the driver can still operate the friction clutch even when the actuator has actuated the (normally closed) friction clutch. For this purpose, for example, actively controlled valves or a floating piston of the actuator are known in the art. However, such actively controlled valves require a lot of control effort. In addition, a smooth and uncomplicated transfer from the actuator to the driver in known actuators with floating piston is not readily possible, since in this the

Clutch pedal is rigid when the actuator operates the friction clutch.

It is an object of the present invention, at least partially solve the problems described with reference to the prior art and in particular to provide an actuator for an actuator of a friction clutch, with an uncomplicated transfer from the actuator to the driver of a motor vehicle is possible. Next to the driver, the state of the actuator (actuated actuator for actuating the clutch or not) on the actuation forces of

Clutch pedals can be taught.

The object is solved by the features of independent claim 1. Advantageous developments are the subject of the dependent claims. The features listed individually in the claims can be combined in a technologically meaningful way and can by explanatory

Facts are supplemented from the description and details of the figures, with further embodiments of the invention are shown.

The invention relates to an actuator for an actuating device of a friction clutch, wherein the actuating device comprises at least one operable by a clutch pedal master cylinder, the actuator and a provided for actuating the friction clutch slave cylinder, which are interconnected via pressure lines, wherein the slave cylinder by the master cylinder and through the Actuator can be actuated; wherein the actuator comprises at least one housing and arranged therein a first piston, which is actuated by an actuator drive, and a second piston, which is actuated by the master cylinder, wherein the

Actuator has two threaded spindles, each with a spindle nut, wherein both spindle nuts are connected at least to the first piston for actuating the first piston.

From previously unpublished DE 10 2016 201296 and DE 10 2016 201 748 actuators are known in which the pistons are actuated by a threaded spindle. The content of these documents is fully and in particular with regard to the structure of the actuator and the arrangement of the piston and the

Pressure accumulator referred to.

In contrast to these writings, it is now proposed here two

Use threaded spindles. These threaded spindles are arranged in particular parallel to one another, wherein the spindle nuts arranged thereon are moved together, by a preferably synchronized drive of the threaded spindles, along the threaded spindles. Threaded spindles convert a rotational movement (rotational movement of the threaded spindle) into a translatory movement (along the axial first and second directions) of the spindle nut.

In particular, the threaded spindles are arranged on opposite sides of the first piston. The first piston is preferably arranged exactly between the threaded spindles.

Preferably, the actuator drive comprises an electric motor through which both

Threaded spindles are driven simultaneously.

In particular, each threaded spindle at a first end to a gear, wherein the electric motor via a toothing of a drive shaft with one of the two gears and the gears to drive both threaded spindles mesh or the electric motor via the teeth of the drive shaft with one of the two gears and with a Intermediate shaft and the intermediate shaft with the other of the two gears meshes.

The intermediate shaft can ensure that both threaded spindles can actually be driven in a fully synchronized manner. This can ensure that Both spindle nuts are arranged at the same time at the same positions along the axial direction. Jamming of the first piston can thus be prevented.

In particular, the first piston is through the master cylinder or through the

Actuator along an axial first direction displaceable, at least a first energy storage is chargeable by said first displacement, wherein at least the first piston is reset by the supercharged first energy storage in a second direction opposite to the first direction.

Preferably, the at least one first energy store is at least one

Torsion spring, wherein a torsion spring by a rotation of a

Threaded spindle is aufdrehbar. By the torsion spring so the

Threaded spindle rotated in the opposite direction and thus the spindle nut and the first piston are moved back along the axial direction.

Preferably, each threaded spindle is connected at the first end with a torsion spring as the first energy storage. The arrangement at the first end, ie at the same end of the threaded spindle on which the gears are arranged to drive the threaded spindle, allows a space-saving and compact design of the actuator.

In particular, the at least one first energy store is at least one

Compression spring, wherein the at least one compression spring coaxial with the first piston for returning the first piston and / or coaxial with the at least one

Threaded spindle for returning the spindle nut is arranged.

In this case, a compression spring is a spring which is elastically compressible and thereby stores energy. In contrast, a tension spring is a spring which is elastically expandable / extendable and thereby stores energy.

In particular, the second piston is displaceable by the master cylinder along an axial first direction, at least through this second displacement a second energy storage is rechargeable, wherein the second piston through the charged second energy storage in one of the first direction

opposite second direction is reset.

The at least one second energy store is preferably a compression spring or a tension spring.

The actuator is preferably in parent assemblies, ie z. B. one

Actuation unit for a friction clutch, can be used. In particular, the

Actuator installed together with a friction clutch in a motor vehicle.

The invention and the technical environment will be explained in more detail with reference to FIGS. The figures show particularly preferred embodiments, to which the invention is not limited. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. Like reference numerals designate like objects. Show it:

1 shows an actuating device for a friction clutch with an actuator with a threaded spindle, partly in a side view in section, partly in perspective view;

2 shows a first exemplary embodiment of an actuator in a side view in FIG

Cut;

Fig. 3: a drive shaft in a meshing arrangement with the gears of

Screws;

4 shows a second exemplary embodiment of an actuator in a side view in FIG

Cut;

5 shows a third exemplary embodiment of an actuator in a side view in FIG

Cut; 6 shows a fourth exemplary embodiment of an actuator in a side view in section;

7 shows a fifth exemplary embodiment of an actuator in a side view in FIG

Cut;

8 shows a sixth exemplary embodiment of an actuator in a side view in FIG

Cut;

Fig. 9: a drive shaft and an intermediate shaft in a meshing arrangement with the gears of the threaded spindles; and

10 shows a seventh exemplary embodiment of an actuator in a side view in FIG

Cut.

Fig. 1 shows an actuating device 2 for a friction clutch 3 with an actuator 1 with a threaded spindle 12, partly in a side view in section, partly in perspective view. For actuating the friction clutch 3, a master cylinder 5 can be actuated by a clutch pedal 4. A fluid is moved via pressure lines 7 from the master cylinder 5 via the actuator 1 to the slave cylinder 6, the

Friction clutch 3 disengages and / or engages. To reduce CO 2 emissions from motor vehicles with manual transmission, the actuator 2 has an actuator 1. This actuator 1 enables a so-called "sailing function", by means of which the drive unit of the motor vehicle can be switched off by opening the friction clutch 3 during coasting of the motor vehicle, where the slave cylinder 6 is connected to the master cylinder 5 and the actuator 1 in such a way that both the master cylinder 5 and the actuator 1 can actuate the slave cylinder 6 and thus actuate the friction clutch 3. The master cylinder 5 and the actuator 1 are arranged in series, so that a transfer between the actuator 1 and the master cylinder 5 and vice versa is possible the driver then also actuate the friction clutch 3 when the actuator 1 has actuated the (normally closed) friction clutch 3. The actuator 1 has a housing 8 and therein arranged a first piston 9 which is actuated by an actuator drive 10, and a second piston 11 which is actuated by the master cylinder 5, wherein the actuator drive 10 has a threaded spindle 12 with a spindle nut 14, wherein the spindle nut 14 with the first piston. 9 are connected to actuate the first piston 9. Here, the second piston 11 is displaced by the first piston 9.

The friction clutch 3 may, for. B. via a displacement of the fluid from the

Master cylinder 5 are operated towards the slave cylinder 6. Furthermore, the friction clutch 3 by the actuator 1 by a displacement of the fluid with the first piston 9 and the second piston 11 in the first direction 25 toward

Slave cylinder 6 are operated. The pistons 9, 11 can be reset by the electric motor 18 and / or by the energy store 27 (in this case a compression spring 30). By additional operation of the clutch pedal 4, the actuator 1 can be overruled by the driver. In this case, the first piston 9 is displaced by the shifted toward the actuator 1 fluid in the second direction 28, wherein the second piston 11 is not moved. If the clutch pedal 4 is released, the second piston 11 is reset by the energy storage 27 again.

Fig. 2 shows a first embodiment of an actuator 1 in a side view in section. The actuator 1 comprises a first piston 9, which can be actuated by an actuator drive 10, and a second piston 11, which can be actuated by the master cylinder 5, wherein the actuator drive 10 two threaded spindles 12, 13, each with a spindle nut 14, 15, wherein both spindle nuts 14, 15 are connected to the first piston 9 for actuating the first piston 9. The

Threaded spindles 12, 13 are arranged on opposite sides 16, 17 of the first piston 9. Furthermore, the actuator drive 10 comprises an electric motor 18, by means of which both threaded spindles 12, 13 can be driven simultaneously. Each threaded spindle 12, 13 has at a first end 19 a gear 20, 21, wherein the electric motor 18 via a toothing 22 of a drive shaft 23 with one of the two gears 20, 21 and the gears 20, 21 for driving both threaded spindles 12, 13th comb each other. The first piston 9 is displaceable by the master cylinder 5 or by the actuator drive 10 along an axial first direction 25, wherein at least one first energy store 27 can be charged by this first displacement 26, wherein at least the first piston 9 can be reset by the charged first energy store 27 in a second direction 28 opposite to the first direction 25. The at least one first energy store 27 here comprises two torsion springs 29, wherein in each case a torsion spring 29 by a rotation of a respective threaded spindle 12, 13 is aufdrehbar. By the torsion springs 29 so the respective threaded spindle 12, 13 rotated in the opposite direction and thus the spindle nut 14, 15 and the first piston 9 along the axial second direction 28 are moved back.

The second piston 11 is displaceable by the master cylinder 5 along an axial first direction 25, a second energy store 32 being chargeable by this second displacement 31, the second piston 11 being charged by the second energy store 32 in a second direction opposite to the first direction 25 28 is recoverable. The second energy store 32 is here a compression spring 30.

The first piston 9 and the second piston 11 are designed here as an annular piston, ie with an annular piston surface.

Fig. 3 shows a drive shaft 23 with a toothing 22 in a meshing arrangement with the gears 20, 21 of the threaded spindles 12, 13 of the first

Embodiment of an actuator 1 according to FIG. 2 in a plan view along the axial first direction 25.

Fig. 4 shows a second embodiment of an actuator 1 in a side view in section. Reference is made to the comments on FIGS. 2 and 3. In contrast to FIG. 2, the first energy store 27 here is a compression spring 30, the compression spring 30 being arranged coaxially with the first piston 9 for resetting the first piston 9.

The second piston 11 is displaceable by the master cylinder 5 along an axial first direction 25, wherein a second energy storage 32 is chargeable by this second displacement 31, wherein the second piston 11 through the charged second energy storage 32 in one of the first direction 25 opposite second direction 28 can be reset. The second energy storage 32 is here a tension spring 33.

Fig. 5 shows a third embodiment of an actuator 1 in a side view in section. In contrast to FIGS. 2 and 4, the at least one first comprises

Energy storage 27 here two compression springs 30, each compression spring 30 is arranged coaxially with each of a threaded spindle 12, 13 for returning the spindle nut 14, 15. The second piston 11 is through the second charged

Energy storage 32 in one of the first direction 25 opposite second direction 28 resettable, the second energy storage 32 is here a compression spring 30.

The first piston 9 is designed here as an annular piston, ie with an annular piston surface. The second piston 11 is designed as a rotary piston, ie with a circular piston surface.

Fig. 6 shows a fourth embodiment of an actuator 1 in a side view in section. As shown in Fig. 5, a compression spring 30 is used as the second energy storage 32, wherein the first piston 9 is an annular piston and the second piston 11 is a rotary piston. In contrast to FIG. 5, the first energy store 27 is formed by two torsion springs 29, wherein in each case a torsion spring 29 at a second end of a threaded spindle 12, 13 is arranged.

Fig. 7 shows a fifth embodiment of an actuator 1 in a side view in section. As shown in Fig. 4, are here as energy storage 27, 32, a compression spring 30 for the first piston 9 and a tension spring 33 for the second piston eleventh

intended. The pistons 9, 11 are each designed as a rotary piston. Fig. 8 shows a sixth embodiment of an actuator 1 in a side view in section. Both pistons 9, 11 are designed here as a rotary piston. The second

Energy storage 32 is formed by a tension spring 33. The first energy storage 27 is formed by two torsion springs 29, wherein in each case a torsion spring 29 at a second end of a threaded spindle 12, 13 is arranged.

Fig. 9 shows a drive shaft 22 and an intermediate shaft 24 in combing

Arrangement with the gears 20, 21 of the threaded spindles 12, 13. Reference is made to the arrangement of the electric motor 18 and the gears 20, 21 shown in FIG. 8. Again, each threaded spindle 12, 13 at a first end 19, a gear 20, 21, wherein the electric motor 18 via a toothing 22 of a drive shaft 23 with the first gear 20 and with an intermediate shaft 24 and the intermediate shaft 24 with the second gear 21st combs. The gears 20, 21 do not mesh with each other. The intermediate shaft 24 causes both threaded spindles 12, 13 are actually and completely synchronized driven. It can thus be ensured that both spindle nuts 14, 15 are arranged at the same positions along the axial direction 25, 28 at the same time. Jamming of the first piston 9 can thus be prevented.

Fig. 10 shows a seventh embodiment of an actuator 1 in a side view in section. Reference is made to the comments on FIG. 8. In contrast to FIG. 8, here both torsion springs 29 are arranged at the first ends 19 of the threaded spindles 12, 13 as first energy stores 27. The arrangement at the first end 19, ie at the same end of the threaded spindle 12, 13, on which the gears 20, 21 for driving the respective threaded spindle 12, 13 are arranged, allows a space-saving and compact design of the actuator. 1 Bezuaszeichenliste actor

actuator

friction clutch

clutch pedal

Master cylinder

slave cylinder

pressure line

casing

first piston

Aktorantrieb

second piston

first threaded spindle

second threaded spindle

first spindle nut

second spindle nut

first page

second page

electric motor

first end

first gear

second gear

gearing

drive shaft

intermediate shaft

first direction

first shift

first energy store

second direction

torsion spring

compression spring second shift second energy storage tension spring

Claims

claims

1. Actuator (1) for an actuating device (2) of a friction clutch (3), wherein the actuating device (2) at least one by a clutch pedal (4) operable master cylinder (5), the actuator (1) and one for actuating the friction clutch ( 3) provided slave cylinder (6), over

Pressure lines (7) are interconnected, wherein the slave cylinder (6) by the master cylinder (5) and by the actuator (1) is operable; wherein the actuator (1) has at least one housing (8) and arranged therein a first piston (9) which can be actuated by an actuator drive (10) and a second piston (11) which can be actuated by the master cylinder (5) , where the

Actuator (10) has two threaded spindles (12, 13) each having a spindle nut (14, 15), wherein both spindle nuts (14, 15) at least with the first piston (9) for actuating the first piston (9) are connected.

Second actuator (1) according to claim 1, wherein the threaded spindles (12, 13) on opposite sides (16, 17) of the first piston (9) are arranged.

3. Actuator (1) according to one of the preceding claims, wherein the actuator drive (10) comprises an electric motor (18) through which both threaded spindles (12, 13) are driven simultaneously.

4. Actuator (1) according to claim 3, wherein each threaded spindle (12, 13) at a first end (19) has a gear (20, 21), wherein the electric motor (18) via a toothing (22) of a drive shaft (23 ) with one of the two gears (20, 21) and the gears (20, 21) for driving both threaded spindles (12, 13) mesh with each other or the electric motor (18) via the toothing (22) of the drive shaft (23) with one of two gears (20, 21) and with a

Intermediate shaft (24) and the intermediate shaft (24) with the other of the two gears (21, 20) meshes.

5. Actuator (1) according to one of the preceding claims, wherein the first piston (9) by the master cylinder (5) or by the actuator drive (10) along an axial first direction (25) is displaceable, said first through this

Displacement (26) at least a first energy storage device (27) is chargeable, wherein at least the first piston (9) by the charged first

Energy store (27) in one of the first direction (25) opposite the second direction (28) is reset.

6. Actuator (1) according to claim 5, wherein the at least one first energy store (27) at least one torsion spring (29), wherein a torsion spring (29) by a rotation of a threaded spindle (12, 13) is aufdrehbar.

7. Actuator (1) according to claim 6, wherein each threaded spindle (12, 13) at the first end (19) with a torsion spring (29) is connected as a first energy store (27).

8. Actuator (1) according to claim 5, wherein the at least one first energy store (27) is at least one compression spring (30), wherein the at least one compression spring (30) coaxial with the first piston (9) for returning the first piston (9 ) and / or coaxial with at least one threaded spindle (12, 13) for returning the spindle nut (14, 15) is arranged.

9. Actuator (1) according to one of the preceding claims, wherein the second piston (11) by the master cylinder (5) along an axial first direction (25) is displaceable, said at least a second energy storage (32 ), wherein the second piston (11) can be reset by the charged second energy store (32) in a second direction (28) opposite the first direction (25).

10. Actuator (1) according to claim 9, wherein the at least one second energy store (32) is a compression spring (30) or a tension spring (33).