DE102019107710A1 - Switching device for a power transmission element of a motor vehicle - Google Patents

Abstract

The invention relates to a switching device (2) for switching a power transmission element (100) of a motor vehicle, with a shift actuator (4) which can be hydraulically actuated against a restoring force and which interacts with the power transmission element (100) and can be transferred from a first switching position to a second switching position The switching device has a locking device which is able to lock the switching actuator (4) in the second switching position even without the application of a hydraulic pressure force. The known switching devices have the disadvantage that the locking device is designed as an independently driven device. This improves the invention in that the locking device is formed by a locking actuator (12) which has a locking element (17) which can be set against a return means (14) and which can be transferred from a locking position to an unlocked release position and that when the hydraulic Actuating force falls below the force of the restoring means (14), without the application of a hydraulic actuating force by the restoring means (14) being able to automatically assume the blocking position, the switching actuator (4) being fixed in the second switching position by the blocking element (17).

Description

The invention relates to a switching device for switching a power transmission element arranged in a motor vehicle according to the preamble of claim 1. Such switching devices have a switching actuator which can be hydraulically actuated against a restoring force and which interacts with the power transmission element to switch it. In this case, the shift actuator is moved back and forth between a first shift position and a second shift position by a usually hydraulic pressure force. To fix the shift actuator, a locking device is provided which is able to lock the shift actuator in the second shift position even if the hydraulic pressure force is not applied.

Such switching devices are used, for example, for coupling or decoupling the primary and secondary drive trains in drive trains of motor vehicles which have a permanently driven primary drive train and a secondary drive train that can be connected to or decoupled from the primary drive train as required. The invention is particularly aimed at such an application. Basically, however, they can be used for all switching tasks in which a switching and a definition of the switching position are desired at least in one switching position of the switching actuator and the switching device should be able to hold both switching positions permanently without the supply of external energy.

A generic switching device is from WO 2017/028913 A1 known. The switching device described there is part of a system for actuating a clutch device for engaging a drive train. In this drive train, when a force required to operate the clutch is applied, a disengaging unit is in operative connection with secondary drive elements. Alternatively, a drive coupling is provided which produces an operative connection between the primary drive elements or the secondary drive elements and a manipulated variable unit of the disengagement unit in order to provide the force required to actuate the coupling. The release unit has a retaining element which holds the clutch in the disengaged position by means of a retaining force during operation of the vehicle.

In the development of switchable drive trains, there is a constant need to develop measures to increase the energy efficiency of switching devices, to improve their modularity, to reduce costs and to facilitate their assembly. Furthermore, the known switching devices have the disadvantage that an independently driven and separately controllable locking mechanism is used to fix the switching actuator in one position.

The object of the invention is therefore to create a switching device for a motor vehicle which has a simple and inexpensive structure and enables simple assembly with the highest possible operational reliability. Another object of the invention is to create a switching device which enables additional loads to be lubricated easily and simply via components used to actuate the switching device.

The first-mentioned object is achieved according to the invention by a switching device having the features of claim 1. Preferred embodiments of the invention are specified in the subclaims and the following description, wherein the features mentioned can each represent an aspect of the invention individually or in the combinations specified in the subclaims, and the second-mentioned object in particular of a switching device with the features of claims 8 to 10 is solved particularly advantageously.

• Der Schaltaktuator und der Sperraktuator sind beide zwischen zwei Stellungen hin und her beweglich. Der Schaltaktuator ist dabei von einer ersten Schaltstellung, in der zum Beispiel die Kupplung eingerückt ist, hydraulisch in eine zweite Schaltstellung beweglich, in der die Kupplung beispielsweise ausgerückt ist. Letztlich ist aber die eigentliche Schaltaufgabe des Schaltaktuators nicht wesentlich. Der Sperraktuator dient vordringlich zum Festlegen oder Blockieren des Schaltaktuators zumindest in einer der beiden Stellungen. Natürlich können auch zwei Sperraktuatoren zum Festlegen in beiden Stellungen oder auch ein Festlegen in einer Zwischenstellung vorgesehen sein, sofern dies im Einzelfall gewünscht sein sollte.

According to the invention, the locking device is formed by a locking actuator which can be moved hydraulically against the force of a return means and which interacts with the switching actuator in a special way, which is described in detail below:

• The switching actuator and the locking actuator can both be moved back and forth between two positions. The shift actuator can be moved hydraulically from a first shift position, in which the clutch is engaged, for example, into a second shift position, in which the clutch is disengaged, for example. Ultimately, however, the actual switching task of the switching actuator is not essential. The locking actuator is used primarily to fix or block the switching actuator at least in one of the two positions. Of course, two locking actuators can also be provided for fixing in both positions or also fixing in an intermediate position, if this should be desired in the individual case.

In a common application, however, the locking actuator will fix the switching actuator in the second position. This is preferably done mechanically by means of a form-fitting blockage by a locking element. However, frictional or other blocking mechanisms can just as well be used.

Both the switching actuator and the locking actuator are preferably in a non-deflected switching position via restoring forces held, unless there is a hydraulic pressure that moves the switching actuator or the locking actuator against the restoring forces in the other position. In this case, the locking actuator in the non-deflected position can lock the switching actuator in the second deflected position. While the shift actuator switches, for example, the power transmission element in the non-deflected position, that is to say, for example, engages the clutch, the lock actuator can fix the shift actuator in the non-deflected position, the locked position.

In order to enable a simple and largely energy-free retention of the switching actuator, the locking device forms a mechanical lock in one embodiment of the invention. The mechanical locking advantageously comprises a locking element of the locking actuator coupled to the movement of the locking actuator and a recess on the switching actuator into which the locking element of the locking actuator engages. It is of course also possible in the opposite way to provide the locking element on the switching actuator, which in turn engages in a recess on the locking actuator.

When the hydraulic pressure is reduced or ceased, the locking actuator is preferably forced into the locking position by the force of the return means. If the shift actuator is in the deflected, second shift position in this position, in which the clutch is disengaged, the shifting device can hold the clutch in the disengaged position without hydraulic pressure being applied through the positive locking of the locking element with a moving part of the shift actuator.

Such a switching device enables a power transmission element, e.g. opening or closing a clutch without its own pressure or lubricant supply system. By the switching device via an interface to the pressure or lubricant supply system of another technical assembly, e.g. can be connected by the transmission, a high degree of modularity, lower weight and lower costs are achieved and the installation space requirement (package) is reduced.

The device preferably provides that either only the switching actuator or only the locking actuator is acted upon with pressure. In a preferred embodiment, the locking device is unlocked when the locking actuator is actuated by means of a pressure force generated by the pressure supply unit. In this way, the force transmission element can be disengaged or opened, in particular the coupling elements on the input and output sides and, by actuation of the locking actuator, can be engaged in power transmission. When the locking actuator is actuated, the shift actuator is released, as a result of which the force transmission element, in particular the clutch, closes and consumers assigned to the shifting device are also supplied with lubricant.

The switching actuator and / or the locking actuator are preferably designed as a piston / cylinder unit. A hydraulic connection is preferably provided on one side of the piston / cylinder unit in order to be able to apply a hydraulic pressure force to the respective piston. The restoring means of the switching actuator and / or the locking actuator is designed as a restoring spring for a simple structure and dynamic switching behavior.

One possible application of the invention is the hydraulic switching system for a drive system of a motor vehicle with a force transmission element and a switching device according to the invention for switching the force transmission element. Clutches, e.g. Claw clutches or friction clutches to understand. In order to be able to operate the switching device, a pressure supply unit is preferably provided. For reasons of installation space and costs, it is advantageous if a pressure supply unit is part of an existing assembly, for example a PTU or an axle drive unit with a positive differential and / or a clutch-controlled differential-free power distribution or a combination thereof.

One possible embodiment provides that the pressure supply unit has a pump and one or more pressure difference-dependent, self-switching or selectively controllable switching valves. The valves can be arranged and connected in such a way that either the switching actuator or the blocking actuator can be acted upon with a compressive force. Only one switching valve is particularly preferably provided and designed as a 2/2-way valve. Such a valve has two connections and two switching positions. The switching actuator and the blocking actuator are connected to the connections of the 2/2-way valve that correspond to the switching positions. The connection of the first switching position of the 2/2-way valve is connected, for example, to the switching actuator and the connection of the second switching position of the 2/2-way valve is connected to the blocking actuator.

The use of valves achieves particularly high switching dynamics. The pump pressure applied to the valve or valves can suddenly be released from the hydraulic connection of the Switching actuator can be switched to the hydraulic connection of the locking actuator and vice versa. Opens the switching device in the second deflected switching position of the switching actuator, the clutch or generally the power transmission element, and the locking actuator in the non-deflected position locks the switching actuator in this position, is by switching over the valve, in connection with the restoring force of the restoring element of the Shift actuator, a very fast closing of the clutch is possible. Such an interconnection also enables a "change-of-mind" reaction: During the opening process, the clutch can be quickly closed again and a shift process that has already been initiated but not yet completed can be quickly canceled again.

A simple and advantageous embodiment provides that the pressure supply unit has a pump and one connection of the pump is connected to the switching actuator and a further connection of the pump is connected to the blocking actuator. The pump is preferably designed as a bidirectional pump. Pressure is applied to the switching actuator in one direction of rotation and pressure to the blocking actuator in the other direction of rotation.

The switching device described above can advantageously be integrated into an existing assembly (axle drive unit, PTU, transmission, etc.) in such a way that the application of the actuation pressure and the provision of lubricant can be implemented via a common pump.

In an advantageous embodiment, the switching device therefore has a lubricant blocking device for closing or opening a lubricant supply train in order to supply components or assemblies in the drive train with lubricating and / or cooling oil as required, depending on the switching position. In a preferred embodiment, the lubricant locking device is coupled to a movement of the locking actuator so that the lubricant locking device can be opened or closed by applying pressure to the locking actuator. In addition or as an alternative to the lubricant device, a pressure relief device can also be provided for rapid pressure reduction in the shift actuator.

By providing the lubricant blocking device and / or the pressure relief device as part of the switching device, lubrication and cooling as required and / or depending on the switching position is possible in a particularly advantageous manner. This can increase efficiency and reduce costs. One possible embodiment provides for the lubricant to be provided by the pump of the pressure supply unit in a lubricant or coolant supply line, in which the consumer is downstream from a valve means with which the lubricant or coolant supply is opened or closed. Opening the lubricant blocking device can then bring about the provision of lubrication and / or cooling for the power transmission element or other consumers (bearings, gears, etc.). A coupling of the opening of the lubricant locking device or the pressure relief device to the deflected release position of the locking actuator, in which the switching actuator is unlocked, is preferred.

In one embodiment, it is provided that the interconnection and / or arrangement of the lubricant or coolant blocking device and / or the pressure relief device is designed so that the lubricant or coolant blocking device of the corresponding supply line is located downstream of the valve means.

In the following, the invention is explained by way of example with reference to the attached drawings using preferred exemplary embodiments, wherein the features shown below can represent an aspect of the invention both individually and in combination.

• 1 eine erste Ausführungsform einer hydraulischen Schaltvorrichtung zum Schalten einer Klauenkupplung in einer ausgerückten Stellung der Klauenkupplung,
• 2 das hydraulische Schaltsystem aus 1 in einer zweiten Stellung, in der der Einrückvorgang der Klauenkupplung beginnt,
• 3 das hydraulische Schaltsystem aus 1 in einer dritten Stellung, in der der die Klauenkupplung eingerückt ist,
• 4 das hydraulische Schaltsystem aus 1 in einer vierten Stellung, in der der die Klauenkupplung eingerückt ist und der Verbraucher kontinuierlich oder alternierend mit Schmiermittel versorgt ist,
• 5 das hydraulische Schaltsystem aus 1 in einer fünften Stellung, in der der die Klauenkupplung ausgerückt wird,
• 6 eine zweite Ausführungsform eines hydraulischen Schaltsystems zur Schaltung einer Klauenkupplung mit erfindungsgemäßer Schaltvorrichtung in einer ersten Stellung,
• 7 das hydraulische Schaltsystem aus 6 in einer zweiten Stellung, in der der Einrückvorgang der Klauenkupplung beginnt,
• 8 das hydraulische Schaltsystem aus 6 in einer dritten Stellung, in der der die Klauenkupplung eingerückt ist und der Verbraucher kontinuierlich oder alternierend mit Schmiermittel versorgt ist,
• 9 das hydraulische Schaltsystem aus 6 in einer fünften Stellung, in der die Klauenkupplung ausgerückt wird,

In the drawings show:

• 1 a first embodiment of a hydraulic switching device for switching a dog clutch in a disengaged position of the dog clutch,
• 2 the hydraulic switching system off 1 in a second position, in which the engagement process of the dog clutch begins,
• 3 the hydraulic switching system off 1 in a third position in which the dog clutch is engaged,
• 4th the hydraulic switching system off 1 in a fourth position in which the dog clutch is engaged and the consumer is continuously or alternately supplied with lubricant,
• 5 the hydraulic switching system off 1 in a fifth position in which the dog clutch is disengaged,
• 6th a second embodiment of a hydraulic switching system for switching a dog clutch with a switching device according to the invention in a first position,
• 7th the hydraulic switching system off 6th in a second position, in which the engagement process of the dog clutch begins,
• 8th the hydraulic switching system off 6th in a third position in which the dog clutch is engaged and the consumer is continuously or alternately supplied with lubricant,
• 9 the hydraulic switching system off 6th in a fifth position in which the dog clutch is disengaged,

The 1 to 5 show a hydraulic switching system for switching a power transmission element 100 in the form of a dog clutch in a drive train of a motor vehicle with a first embodiment of the switching device according to the invention 2 .

The switching device 2 includes a shift actuator 4th and a lock actuator 12 . In the figures shown are the shift actuator 4th and the lock actuator 12 each as a piston / cylinder unit with a switching device functioning as a return element 6th for the switch actuator 4th and a reset means 14th for the locking actuator 12 educated.

The switch actuator 4th is about one with a piston 7th the piston rod mechanically connected to the piston / cylinder unit with the shift fork as a power transmission element 100 used claw coupling coupled. To the piston / cylinder units of the switch actuator 4th and the locking actuator 12 . can each have a hydraulic connection 8th , 16 a compressive force can be applied. On the locking actuator 12 is a blocking element 17th arranged to the movement of the piston 15th of the locking actuator 12 is coupled. This can, as shown, be a direct extension of the piston rod, but also an indirect coupling, for example via a gear or in a similar manner, also via a hydraulic line acted upon by the piston with pressure.

The piston 7th of the shift actuator 4th has a recess into which the locking element 17th of the locking actuator 12 able to intervene in the locked position. Together form the locking element 17th and the recess is a locking device designed as a positive, mechanical lock. Furthermore is on the lock actuator 12 an additional valve means 18th provided that in particular fulfills the function of a lubricant blocking device and also, as a pressure relief device, a rapid pressure reduction when closing the force transmission element 100 from the piston of the shift actuator 4th to be displaced fluid volume is used. The valve means 18th is designed here as a slide that controls the movement of the piston 15th of the locking actuator 12 is coupled and the one downstream hydraulic line 20th able to interrupt or release. But this is only one possible application of the additional valve means 18th , here are also other setting options conceivable by the movement of a piston 7th , 15th or another moving part can be activated.

That in the 1 to 5 The hydraulic system shown here also has a particularly advantageous, bidirectionally actuatable and preferably software-controlled pump 22nd as a pressure supply unit. A first connection of the pump 22nd is with the switch actuator 4th and a second connection to the pump 22nd is with the locking actuator 12 connected. There are also valves 24 , preferably on the basis of the applied differential pressure, self-switching valves, in particular valves in the form of check valves, consumers to be supplied with lubricant 30th and an expansion tank 26th Part of the hydraulic switching system shown. The valve means used as a lubricant blocking device 18th lockable lubricant supply line 20th is with the supply line to the hydraulic connection of the switch actuator 4th connected. The switching states of the switching device are shown below 2 during the closing process of the dog clutch and a subsequent opening process described in detail with reference to the figures.

The 1 shows the switching device 2 in an open position of the force transmission element forming the dog clutch 100 . The system is in a pressureless state in which no energy is supplied to the system. The pump 22nd stands and the system is pressure-free. The dog clutch is open.

The locking element 17th engages, pushed by the restoring means 14th , in the position shown in the recess of the switching actuator 4th and locks a return of the piston 7th of the shift actuator 4th by means of the switching means 6th that the piston 7th into a power transmission device 100 wants to push the closing direction. That way the pump can 22nd switched off and the claw clutch held in the open position without any energy supply. The valve means 18th , designed here as a slide of a pressure relief device, closes in the illustrated position of the switching device 2 the downstream hydraulic line 20th . Through the valve means 18th can be the piston pressure of the switch actuator 4th can be reduced as quickly as possible by simply opening the valve means 18th a fast switching time is thus realized.

2 shows the hydraulic switching system 1 in an intermediate position in which the locking actuator 12 through the pump 22nd is applied with a compressive force. The piston becomes due to the applied pressure 15th of the locking actuator 12 contrary to the restoring means 14th forming spring deflected and the locking element 17th from the Recess of the switching actuator 4th moved out. The locking device is thus released and changes from a locking position to a release position. The downstream hydraulic tank 20th is still through the valve means forming the pressure relief device 18th locked.

In 3 the hydraulic switching system is off 1 shown in a third position. In the fully deflected position of the locking cylinder 12 becomes the slide of the valve means 18th opened and the piston 7th of the shift actuator 4th is through the switching means 6th of the shift actuator 4th deferred. That through the piston 7th of the shift actuator 4th Hydraulic fluid pressed out was via the connection of the shift actuator 8th by valve means 18th via the downstream hydraulic line 20th back to the expansion tank or reservoir 26th guided. In addition to the pressure relief through the valve means 18th supports the pump 22nd , on the suction side of which the cylinder volume of the switching actuator is located, the displacement of the fluid volume from the switching actuator 4th . The switch actuator 4th is completely through the switching means 6th reset and used as a power transmission element 100 The claw coupling shown is via the one with the piston rod 10 related shift fork closed.

In 4th the switching device is also drawn in a position in which the dog clutch is closed. The pump 22nd is only operated as required in this position, which on the one hand the locking cylinder 12 is acted upon with the compressive force, but without this having an influence on the switching position. In this way, a preferably software-controlled and needs-based lubrication of the consumers is achieved 30th reached. The consumers are there 30th in particular (preferably exclusively) those consumers in need of cooling or lubrication who only need a supply of cooling and / or lubricating oil when the power transmission element is in a closed position. In this position a consumer can 30th can thus be lubricated selectively or permanently, which is done in particular by means of the bidirectional pump 22nd Lubricants or those also used to control the switching system 2 used hydraulic fluid to consumers 30th is fed. The pump 22nd the consumer can therefore supply the lubricant supply line with an alternating or continuous flow of lubricant as required 20th supply. The oiling as required takes place by switching the pump on and off accordingly 22nd .

5 illustrates the hydraulic switching system 1 in a fifth position. The opening process of the force transmission element is shown 100 . The direction of flow of the pump 22nd is reversed so that the switch actuator 4th via the hydraulic connection 8th is applied with a compressive force. The compressive force causes the piston to deflect 7th against the restoring force of the switching means 6th . The locking actuator 12 is no longer through the pump 22nd actuated so that the piston 15th of the locking actuator 12 by the switching means 14th as well as by supporting the pump 22nd on the suction side of which the cylinder volume of the locking actuator to be displaced is now located 12 is located, is reset. The lubricant line 20th is by means of the valve means 18th closed, so that via the downstream hydraulic line 20th no fluid from the switch actuator 4th leading pressure line via the valve means 18th can drain.

While via the hydraulic connection 8th a compressive force on the shift actuator 4th is stamped and the piston 7th against the force of the switching means 6th is deflected, whereby the power transmission device 100 is opened, is the lock actuator 12 in the in the 5 direction of delivery of the bidirectional pump shown 22nd i.e. with the suction side of the pump 22nd connected and substantially unpressurized. The reset means 14th pushes the piston 15th of the locking actuator 12 into the locked position, so that the in 1 will set depressurized or energy-free state shown.

A second embodiment of a hydraulic switching system for switching a power transmission element 100 with inventive switching device 2 is in the 6th to 9 shown. This hydraulic switching system differs only slightly from that in the 1 to 5 embodiment shown. To avoid repetition, only the differences are described below. There are the switching states of the switching device 2 during the closing process of the power transmission element 100 and a subsequent opening process described with reference to the figures.

6th shows the second embodiment of the hydraulic switching system in a first position with the dog clutch disengaged. In the embodiment, consumers are 30th Compared to the previous figures arranged differently and differently with the pump 22nd and the valve 18th interconnected. The valve means 18th The downstream hydraulic line no longer serves primarily as a pressure relief line but as a lubricant supply line 20th by the valve means acting as a lubricant barrier device 18th interruptible and with the supply line to the blocking actuator 12 connected is. In the open position of the power transmission element 100 (Claw coupling) is the valve means 18th closed and consumers 30th are not supplied with lubricant. As in 1 also holds in 6th the switching device the power transmission element 100 pressure-free or without power supply in the open position.

7th clarifies analogously to 2 a transitional position of the in 6th hydraulic switching system shown, between the open and closed position of the power transmission element 100 . The one by the pump 22nd hydraulic pressure built up pushes the piston 15th against the restoring force of the restoring means 14th from the locked position ( 6th ) in a release position. The switching actuator is released by releasing the switching element 6th from the in 6th position shown, which is the open position of the power transmission element 100 guaranteed in the in 8th position shown in which the power transmission element 100 is moved into the closed position, urged.

In 8th is the power transmission element 100 shown in the engaged position, the dog clutch shown purely by way of example in the figures is therefore closed. The switching device is in a pressureless or energy supply-free state. As a result of the deflection of the piston 15th of the locking actuator 12 is the valve means 18th , which acts as a lubricant blocking device, opened. That by the pump 22nd The lubricant is conveyed through the downstream line, which has the function of a lubricant supply line 20th met, to the in the embodiment of 6th to 9 the valve means 18th downstream consumers 30th promoted. As with the in 4th The embodiment shown can also be lubricated here as required. Depending on the design of the hydraulic system and the type of pump 22nd can, as in the case of the previous exemplary embodiment, also an alternating opening and closing of the lubricant supply line 20th can be provided and set so that the consumer can be lubricated, for example, through software-supported targeted control of the pump 22nd takes place as required.

9 shows the hydraulic shift system of the second embodiment in a transition position in which the dog clutch is disengaged. Via the hydraulic connection 8th becomes a compressive force on the shift actuator 4th impressed and the piston 7th is against the force of the switching means 6th deflected. The locking actuator 12 is in the delivery direction of the bidirectional pump shown in the figure 22nd with the suction side of the pump 22nd connected, so the cylinder volume can be quickly displaced and the locking element 17th within a very short time in the in 6th Locked position shown passes. The restoring means presses 14th the piston 15th supporting in the non-deflected position in which the locking element 17th assumes the locked position. In this way, the in 6th Position of the switching device shown 2 brought about again, in which the system as a whole is then again free of pressure or energy supply in a stable position with disengaged or opened force transmission element 100 persists.

Overall, a bi-stable shifting device is thus described in which the shifting device as a whole is the force transmission element in both the first shift position and the second shift position of the shift actuator 100 able to hold permanently in the engaged or disengaged position without external energy supply. At the same time, the switching device enables the needs-based continuous or alternating lubrication and / or cooling of consumers when the force transmission element is engaged.

List of reference symbols

2

Switching device

4th

Shift actuator

6

Switching means of the switching actuator

7th

Piston of the shift actuator

8th

Hydraulic connection of the switch actuator

10

Piston rod

12th

Lock actuator

14th

Resetting means of the locking actuator

15th

Lock actuator piston

16

Hydraulic connection of the switch actuator

17th

Locking element

18th

Valve means

20th

the valve means 18th downstream strand section

22nd

pump

24

Switching or check valve

26th

reservoir

30th

consumer

100

Power transmission element

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• WO 2017/028913 A1 [0003]

Claims (14)

Switching device (2) for switching a force transmission element (100) arranged in a motor vehicle, with • a switching actuator (4) which can be hydraulically actuated against a restoring force and which is designed to interact with the force transmission element (100) in order to switch the force transmission element (100) , and which can be transferred from a first switching position to a second switching position when actuated by a compressive force, and with • a locking device formed by a locking actuator (12) which has at least one locking element (17) that can be adjusted against the force of a restoring means (14), with which the switching actuator (4) can be fixed in the second switching position, whereby the locking element (17) can be transferred from a locking position to a release position that unlocks the switching actuator (4) by means of a hydraulic actuating force and when the hydraulic actuating force exceeds the force of the restoring means ( 14) falls below, due to the force of the return means (14) the locking position is automatically pushed, in which the locking element (17) is able to fix the switching actuator (4) in the second switching position, characterized in that the switching device (2) has a pressure supply unit with a pump (22), the pressure supply unit is designed such that it either applies a hydraulic pressure force to the shift actuator (4) in order to operate the shift actuator (4) or, alternatively, applies a hydraulic pressure force to the lock actuator (12). Switching device (2) after Claim 1 , characterized in that the locking element (17) in the locking position engages behind a retaining edge coupled to the movement of the switching actuator (4) to form a mechanical lock with a locking section. Switching device (2) according to one of the two preceding claims, characterized in that the switching actuator (4) has a piston / cylinder unit in which a piston (7) of the switching actuator (4) automatically counteracts the restoring force of the piston (7) switching means (6) moving into the first switching position, in particular a return spring or some other spring means, can be moved back and forth between the first switching position and the second switching position. Switching device (2) according to one of the preceding claims, characterized in that the locking actuator (12) has a piston / cylinder unit in which a piston (15) of the locking actuator (12) counteracts the restoring force of the particular designed as a return spring or other spring means Resetting means (14) of the locking actuator (12) can be moved back and forth between the locking position and the release position. Switching device (2) according to the preceding claim, characterized in that at least one valve (24) downstream of the pressure supply unit is designed as a 2/2-way valve, the valve (24) having a fluid-technical pressure connection to the switching actuator (4) in the first switching position. and capable of establishing a fluid-technical pressure connection with the blocking actuator (12) in the second switching position. Switching device (2) according to one of the preceding claims, characterized in that the pump (22) is a bidirectional pump (22), one connection of the bidirectional pump (22) to the switching actuator (4) and a further connection of the bidirectional pump ( 22) is in fluid communication with the blocking actuator (12). Switching device (2) according to one of the preceding claims, characterized in that the switching device (2) is dimensioned in such a way that it can be used as a switching device (2) for the drive system of a motor vehicle for engaging and disengaging a power transmission element (100), in particular a clutch, is trained. Switching device (2) according to one of the preceding claims, characterized in that the locking actuator (12) has a valve means (18) with a valve member coupled to the locking element (17), in particular designed as a locking slide or rotary slide, the valve means (18) in a strand of the switching device (2) is provided and the locking actuator (12) actuates the valve means (18) when the locking element (17) moves, in particular the valve means (18) closes or opens. Switching device (2) according to one of the preceding claims, characterized in that the switching actuator (4) has a valve means (18) with a valve member coupled in its movement to the switching actuator (4), the valve means (18) in a branch of the hydraulic system the switching device (2) is provided and the switching actuator (4) when switching from the first switching position to the second switching position by the valve member coupled to the switching actuator (4) actuates the valve means (18), in particular the valve means (18) closes or opens. Switching device (2) according to one of the two preceding claims, characterized in that the hydraulic line (20) downstream of the valve means (18) acts as a lubricant supply line, in particular for providing a Lubricant or coolant for an additional element of the motor vehicle in the form of a consumer (30) and / or a pressure relief line and a lubricant blocking device or pressure relief device for closing the hydraulic line (20) downstream of the valve means (18) is provided, the lubricant blocking device and / or the pressure relief device is formed by the valve means (18). Switching device (2) according to one of the preceding claims, characterized in that the lubricant is conveyed by the pump (22) in the downstream hydraulic line (20) and the provision of the lubrication and / or cooling for the consumer (30) by opening the Valve means (18) takes place. Switching device (2) according to one of the preceding claims, characterized in that the switching device (2) has a valve arrangement or valve control, the pressure supply unit and the valve arrangement or valve control interacting in such a way that, depending on the valve position or the conveying direction of the pressure supply unit, either the switching actuator ( 4) is acted upon with a hydraulic pressure force in order to push the switching actuator (4) into the deflected second switching position, or the locking actuator (12) is acted upon with a hydraulic pressure force in order to push the locking element into the release position. Switching device (2) according to one of the preceding claims, characterized in that the valve control and / or the pressure supply unit are designed in such a way that they are able to provide alternating and / or continuous, needs-based lubrication and / or cooling of consumers. Drive train of a motor vehicle with a permanently driven primary drive train and a secondary drive train that can be switched on or decoupled from the primary drive train by means of a switchable force transmission element (100) and with a switching device (2) according to one of the preceding claims that engages and disengages the force transmission element (100).

Images