Fail-safe drive and adjustment drive with fail-safe drive

Abstract

The invention relates to an improvement in the field of adjusting drives. To this end, inter alia, a failsafe drive (1) for adjusting drives is proposed, which has a drive accumulator (6) comprising at least one disc spring (7) and a cam disc (8) for converting an axial drive movement of a reset element into a rotary drive movement.

Description

TECHNICAL FIELD

[0001] The present application relates to a failsafe drive device and to an adjustment drive device having a failsafe drive device. BACKGROUND

[0002] From US 4 248 104 A a cam-operated spring return mechanism is known, which is connected to an adjustment link for a control element, for example a valve.

[0003] From US 6 572 076 B1 a valve adjustment link is known, which has a housing, a handling part which is located partly in the housing and which is movably covered onto the housing, drive means which are provided for driving the handling part between a first and a second position in order to reconfigure the valve between the first and the second position, an excitable, resilient means within the housing, locking means for locking the resilient means in an excitable state, wherein the locking means are able to cause the drive means to drive the handling part from its two positions to the other position without substantially exciting or de-exciting the resilient means when the resilient means are locked by the locking means, unlocking means for unlocking the resilient means from the locking means in order to cause the handling part to move to one of its positions under the influence of the de-excitation of the resilient means and thereby to reconfigure the valve from one position to the other position, and load transmission means which are movably fixed within the housing and which are pre-tensioned onto the housing by the resilient means.

[0004] From US 2003 / 145667 A1 a linear adjustment link is known. The linear adjustment link comprises a motor for generating a rotary movement, a device for generating a linear movement, which is coupled to the motor in order to convert the rotary movement into a linear movement and which has a screw and nut arrangement, a drivable element which is linearly movable between a first position and a second position by means of the device for generating a linear movement and which is coupled to the elements of the screw and nut arrangement, and a return device for bringing the driven element back into the first position in the event of a fault.

[0005] A damping device for a safety drive of an adjustment drive for fittings or the like is known from WO 01 / 90621 A1. The safety drive can be activated into a safety position in the event of a fault, in the event of an energy failure, for adjusting the fitting with damping by means of the damping device. The damping device has an energy converter and is characterized in that the energy converter has a generator connected to the safety drive for converting kinetic energy into electrical energy and has an electrical load connected to the generator.

[0006] Further safety drives of the type mentioned at the outset are known from the documents US 6 231 027 B1, WO 2011 / 037287 A1 and EP 1 035 307 A1.

[0007] Safety drives can be used, for example, to adjust fittings, such as valves or ball valves or machine parts, into a defined position outside of normal operation when the energy supply of the adjustment drive fails, by means of which a drive motor usually operates the fittings or machine parts.

[0008] Safety drives are also usually referred to as safety units and are arranged in parallel with the usually used drive motor of the adjustment drive to date. Depending on the application case, the fittings or machine parts can thus be operated selectively with the drive motor or the safety drive.

[0009] It has proved to be disadvantageous in this respect, especially when these planetary gear transmissions are to be used in a reversed manner for tensioning the mechanical drive accumulator of the safety drive, that they have a disadvantageous efficiency. The solutions to date therefore usually have an additional motor assigned to the safety drive. SUMMARY

[0010] The task of the present application is especially to provide a safety drive and an adjustment drive which have a simpler structure.

[0011] To solve this task, a safety drive is proposed at first. Thus, especially to solve this task a safety drive for an adjustment drive is proposed, the adjustment drive having a drive accumulator, the drive accumulator comprising at least one disc spring.

[0012] The disc spring of the drive accumulator can be tensioned relatively simply using a drive motor of the adjustment drive, which is equipped with a failsafe drive. Furthermore, by using at least one disc spring in the drive accumulator of the failsafe drive, it is possible to construct the failsafe drive relatively compactly. As a result, the failsafe drive can also be integrated relatively simply into the compact housing of the adjustment drive.

[0013] According to the invention, the failsafe drive has a cam disk, at least one return element, in particular a return spring, a mating element and an output shaft, wherein the cam disk and the mating element are designed to jointly convert an axial movement of the return element into a rotational movement of the output shaft. The axial movement can be produced, for example, by relaxation of the return element.

[0014] As the at least one return element of the failsafe drive, a return spring, in particular at least one disc spring or coil spring as already mentioned previously, can be provided.

[0015] In one embodiment of the failsafe drive, the mating element is rotatable by an axial movement of the cam disk caused by the return element, and the output shaft of the failsafe drive is rotatable by a rotational movement of the mating element. In the embodiment, the mating element can be at least indirectly non-rotatably connected to the output shaft of the failsafe drive.

[0016] In another embodiment of the failsafe drive, the cam disk is rotatable by an axial movement of the mating element caused by the return element, and the output shaft is rotatable by a rotational movement of the cam disk thus produced. In the embodiment, the cam disk can be at least indirectly non-rotatably connected to the output shaft of the failsafe drive.

[0017] In one embodiment of the failsafe drive, the cam disk can be moved axially by at least one disc spring of the drive accumulator. The cam disk can be equipped with a mating element of the failsafe drive, which is at least indirectly connectable or connected to an input shaft and, for example, further to an output shaft of the adjustment drive. The connection between the input shaft and the mating element is preferably releasable in order to allow a relative rotation of the mating element with respect to the input shaft. In order to release the connection, a locking device of the failsafe drive can be used, which will be explained in more detail below. Thus, if the output shaft should be brought into a set position in the event that the drive motor of the adjustment drive cannot be used, for example in the event of an electrical current failure, the mating element can be decoupled from the input shaft if necessary and the mating element is manipulated by means of the failsafe drive.

[0018] In another embodiment of the fail-safe drive, the engagement element can be moved axially by an axial movement of the at least one disc spring. The engagement element is then equipped with a cam disc, which in the embodiment is then connectable or connected at least indirectly with the input shaft and, for example, further with the output shaft of the adjustment drive. The connection between the input shaft and the cam disc is preferably releasable in order to allow a relative rotation of the cam disc with respect to the input shaft. In order to release the connection, the locking device of the fail-safe drive, which will be explained in more detail below, can again be used.

[0019] According to the application, the cam disc has at least one control curve, the course of which is coordinated with the spring characteristic curve of the at least one return element, in particular of the at least one disc spring, so that a constant drive movement and / or a constant drive torque can be generated when activating the fail-safe drive.

[0020] In one embodiment of the fail-safe drive it is provided that at least one disc spring having a non-linear spring characteristic curve is used. In this case, the fail-safe drive can have a cam disc with which the non-linear spring characteristic curve of the at least one disc spring can be compensated in such a way that the constant drive movement mentioned earlier and / or the constant drive torque mentioned earlier can still be generated despite the non-linear spring characteristic curve of the at least one disc spring.

[0021] A constant output torque, which is transmitted by means of the fail-safe drive to an adjustment element, for example to a fitting and / or to a valve, can be achieved by the interaction between the correspondingly configured cam disc and the at least one disc spring of the drive accumulator of the fail-safe drive.

[0022] In order to be able to provide sufficient drive energy also in a relatively small installation space, it is advantageous if the drive accumulator of the fail-safe drive comprises at least two, preferably a plurality of stacked disc springs, in particular having a non-linear spring characteristic curve. Here, the disc springs can be stacked opposite one another, so that with them a sufficiently large stroke can be achieved in order to adjust the axially movable cam disc to actuate the engagement element.

[0023] By using at least two, preferably a plurality of layered disc springs, a relatively high energy density can be provided in the drive accumulator, which is advantageous for the compact design of the drive accumulator and thus for the compact design of the entire fail-safe drive. In this way, the fail-safe drive can also be relatively simply integrated into the compact housing of the adjustment drive.

[0024] The cam disc can be configured as a spherical cam disc.

[0025] The cam disc can have at least two, in particular three or more, preferably uniformly distributed about the axis of rotation of the cam disc, control curves. In this way it is possible for the previously mentioned engagement elements of the failsafe drive to be uniformly loaded by the cam disc and for the axial movement of the cam disc, which is caused by the at least one Belleville spring of the drive accumulator, to be uniformly transmitted to the engagement elements of the adjustment drive, in particular to the output disc, and converted into a rotational movement of the engagement elements.

[0026] In one embodiment of the failsafe drive it is provided that the engagement elements, in particular the output disc, have at least one output roller. The at least one output roller can here roll on the cam disc in order to perform the mentioned movement conversion. Preferably, the engagement elements have a plurality of output rollers, the number of which corresponds to the number of control curves of the cam disc. Thus, each control curve of the cam disc can be respectively assigned one output roller of the engagement elements. The plurality of output rollers can here be uniformly distributed about the axis of rotation of the engagement elements. Furthermore, the at least one output roller can be guided in the use position along the control curve of the cam disc assigned to the output roller.

[0027] In order to be able to easily check the adjustment position of the output shaft of the failsafe drive, the failsafe drive can have an adjustment display for its output shaft. The adjustment display can comprise a first rack, in particular a curved one, which can be connected at least indirectly, for example via the engagement elements or the cam disc, with the output shaft of the failsafe drive. With the first rack it is possible for the movement of the output shaft to be transmitted at least indirectly to a display element of the adjustment display.

[0028] The adjustment display can have a second rack in order to transmit the movement of the output shaft to the display element, which is itself connected to the previously mentioned display element. The movement of the first rack can be transmitted to the second rack and from there to the display element by means of a transmission shaft, which can have pinions for each rack. The display element can be moved by the movement of the output shaft into a viewing window of the housing, whereby the position of the output shaft can be read from the outside.

[0029] In one embodiment of the failsafe drive it is provided that the output shaft of the failsafe drive is at least indirectly coupled, for example via the engagement elements or the cam disc, with a movement damper. The movement damper can be a component of the failsafe drive.

[0030] By means of the movement damper, adjustment movements generated by the failsafe drive in the event of an emergency can be damped and thus damage to the failsafe drive, to the adjustment drive provided with the failsafe drive and / or to the fitting to be actuated by the adjustment drive and / or to the machine component to be actuated by the adjustment drive can be avoided.

[0031] Furthermore, the movement damper can be coupled with the engagement element, in particular with the output disc, in order to dampen the movement of the engagement element which is at least indirectly caused by the drive accumulator.

[0032] The movement damper can comprise a liquid chamber and at least one expelling element, for example an expelling blade, which is movable in the liquid chamber. The liquid chamber can be filled, for example, with oil. The expelling element can be at least indirectly connected or connectable, for example, via the engagement element or the cam disc, with the output shaft. If the engagement element or the cam disc is at least indirectly set in motion by means of the drive accumulator of the failsafe drive, the movement of the engagement element or of the cam disc is also transmitted to the expelling element. Since the expelling element can move within the liquid chamber, the movement of the expelling element is damped, braked and / or slowed down by the liquid, in particular oil, contained in the liquid chamber, so that the movement of the engagement element or of the cam disc of the failsafe drive, which is connected with the expelling element, and thus the movement of the output shaft are also damped.

[0033] Advantageously, the degree of damping of the movement damper is adjustable. This can be achieved, for example, by means of at least one flow regulator of the movement damper.

[0034] The movement damper can provide different degrees of damping along the adjustment path of the expelling element. Thus, before the expelling element reaches its end position, the movement damper can provide a higher degree of damping and thus cause a higher damping effect on the engagement element of the failsafe drive which is at least indirectly connected with the expelling element.

[0035] The different degrees of damping can be provided, for example, by different flow regulators of the movement damper.

[0036] The degree of damping in the range of the end positions of the expelling element on its adjustment path through the liquid chamber can be greater than the degree of damping in the range of the adjustment path of the expelling element between its end positions. In this way, on reaching the end positions of the adjustment drive, the fitting operable with the failsafe drive and / or the machine component operable with the failsafe drive can be protected from impacts and / or shocks. Thus, damage to the fitting and / or to the machine component can be prevented.

[0037] The failsafe drive device can have a locking device. By means of the locking device, the disc spring of the drive accumulator, for example the at least one disc spring already mentioned previously, can be kept tensioned. By means of the locking device, it is also possible to fix, in particular rotationally fix, the mating element or cam disk of the failsafe drive device relative to the input shaft, for example the input shaft already mentioned previously. Furthermore, it is possible to fix, in particular rotationally fix, the mating element and the cam disk of the failsafe drive device relative to one another by means of the locking device.

[0038] The locking device can have a crank lever mechanism. The locking device is then triggered when the failsafe drive device is actuated.

[0039] The locking device can comprise, for example, a locking mechanism which is held in an initial position close to the locking position by means of a return mechanism, in particular by means of a return spring. It is also possible that the locking device comprises a holding magnet with which the locking mechanism can be brought into and / or held in its locking position, in particular against the return force of the return mechanism.

[0040] By means of the return mechanism, the locking mechanism can be held in its initial position close to the locking position. The remaining adjustment movement for bridging the remaining path of the locking mechanism in its locking position is then effected by means of the holding magnet mentioned previously. The holding magnet can have a comparatively small power consumption, which facilitates its use with high energy efficiency.

[0041] In order to be able to test the functionality of the failsafe drive device from time to time, the failsafe drive device can have a test stop. The test stop can be moved from a non-use position into a use position which lies between the tensioned position and the relaxed position of the at least one disc spring. In this way, it is possible to trigger the failsafe drive device in a test mode without the entire drive accumulator being de-energized. Furthermore, it is possible to avoid that the adjustment drive has to assume its undesired position in normal operation, for example the closed position, during the testing of the functionality of the failsafe drive device. Thus, it is possible to avoid that the equipment provided with the adjustment drive equipped with the failsafe drive device is shut down for testing purposes, despite the detection of the failsafe drive device. Thus, by means of the test stop, it is possible to avoid a complete closing of the fitting provided with the adjustment drive and / or of the valve provided with the adjustment drive when the functionality of the failsafe drive device should be tested.

[0042] Furthermore, it is possible to avoid a complete energizing, in particular tensioning, of the drive accumulator after the commissioning mentioned previously.

[0043] The test stop mentioned previously can preferably be moved electromechanically between its non-use position and its use position explained previously.

[0044] In another embodiment it is provided that the failsafe drive has a test stop which can be moved from a non-use position into a use position which is arranged between the two end positions of the cam disk. The test stop can provide a rotational limitation of the cam disk when the cam disk is set in rotation, for example by an axial movement of the engagement element. By means of the rotational limitation it is also possible to avoid a complete discharge of the drive accumulator when the failsafe drive should be triggered only for testing purposes. In the described embodiment the test stop can also be moved electromechanically between its non-use position and its use position.

[0045] In another embodiment it is provided that the failsafe drive has a test stop which can be moved from a non-use position into a use position which is arranged between the two end positions of the cam disk. The test stop can provide a rotational limitation of the cam disk when the cam disk is set in rotation, for example by an axial movement of the engagement element. By means of the rotational limitation it is also possible to avoid a complete discharge of the drive accumulator when the failsafe drive should be triggered only for testing purposes. In the described embodiment the test stop can also be moved electromechanically between its non-use position and its use position.

[0046] In one embodiment of the failsafe drive it is provided that the test stop is equipped with at least one switch, in particular at least one microswitch. By means of the at least one switch it is possible to monitor the function and / or the position of the test stop. Preferably, each end position of the test stop is provided with a switch, in particular a microswitch. It is thus possible to determine in which position the test stop is respectively located.

[0047] In one embodiment it is provided that the cam disk of the failsafe drive is supported longitudinally movably on a support shaft. For this purpose, the cam disk and the support shaft can have guide means which are correspondingly configured to one another. It is furthermore possible that the cam disk is connected non-rotatably relative to the support shaft. The support shaft can be coupled, for example directly or via a transmission, to the input shaft mentioned previously.

[0048] In one embodiment it is provided that the engagement element of the failsafe drive is supported longitudinally movably on a support shaft. For this purpose, the engagement element and the support shaft can have guide means which are correspondingly configured to one another. It is furthermore possible that the engagement element is connected non-rotatably relative to the support shaft. The support shaft can be coupled, for example directly or via a transmission, to the input shaft mentioned previously.

[0049] To solve this task, a failsafe drive is also proposed, wherein at least one of its end positions is equipped with an end position switch, in particular a microswitch. According to the invention, the end position switch is movably, in particular preferably elastically, supported. The end position switch can be equipped to the mating element of the previously mentioned failsafe drive, for example the previously mentioned mating element, or also to the cam disk of the previously mentioned failsafe drive, for example the previously mentioned cam disk. In this way, the end position switch of the failsafe drive can also be protected from damage that can arise as a result of its actuation.

[0050] Furthermore, to solve this task, an adjustment drive is proposed, wherein at least one end position of the adjustment drive is equipped with an end position switch, in particular a microswitch. As a result, the reaching of an end position can be detected. Here, the at least one end position switch is movably, in particular preferably elastically, supported. In this way, the end position switch can also be protected from damage that can arise as a result of its actuation. Here, the end position switch can be equipped to the mating element of the failsafe drive, for example the previously mentioned mating element, or to the cam disk of the failsafe drive, for example the previously mentioned cam disk.

[0051] When the mating element or the cam disk, as a result of a Nachlauf, drives through the actual end position up to the internal end stop, the end position switch can be relieved in the holding device of the end position switch by the elastic support of the end position switch. This takes place without the end position switch being destroyed by the said idling.

[0052] To solve this task, finally an adjustment drive is also proposed, which has an output shaft and a drive motor, which is at least indirectly connected to the output shaft for the transmission of torque, which adjustment drive has a failsafe drive according to the invention for such an adjustment drive. Here, the mating element of the failsafe drive, in particular the previously mentioned output disk, or also the cam disk, for example the previously mentioned cam disk, can be at least indirectly connected to the output shaft of the adjustment drive.

[0053] To prevent the output shaft of the adjustment drive from being driven by the failsafe drive when the drive motor is deactivated and the failsafe drive is activated, it can be advantageous if the output shaft of the adjustment drive can be fixed. The fixing of the output shaft of the adjustment drive can be realized by means of a brake and / or by means of a self-locking transmission, for example by means of a self-locking worm gear.

[0054] It can thus be concluded that the drive accumulator rotates in a tensioned state in normal operation, while the drive accumulator is held rotationally fixed and axially relaxed in failsafe operation.

[0055] In order to be able to manually manipulate the adjustment drive, the adjustment drive can have a hand wheel. BRIEF DESCRIPTION OF DRAWINGS

[0056] The application is explained in more detail below with the help of an example, but is not limited to this example. Other examples result from the combination of individual or multiple features of the claims with one another and / or in the combination of individual or multiple features of the example. In the drawings:

[0057] Figure 1 shows a cutaway side view of the failsafe drive,

[0058] Figure 2 shows Figure 1 a perspective detail view of the failsafe drive without housing, in which the drive accumulator with the plurality of stacked disc springs and the cam disc of the failsafe drive can be seen,

[0059] Figure 3 shows Figure 1 a cross section of the failsafe drive for the purpose of illustrating the locking device of the failsafe drive, by means of which the disc springs of the drive accumulator can be held under tension,

[0060] Figure 4 shows a perspective assembly view of the failsafe drive shown in Figure 1 with an adjustment display device designed to display the position of the output disc of the failsafe drive,

[0061] Figure 5 shows Figure 1 a cross section of the failsafe drive for the purpose of illustrating the motion damper of the failsafe drive, in which the cross section shows the liquid chamber and the displacement element of the motion damper,

[0062] Figure 6 shows a partially cutaway perspective view of the liquid chamber shown in Figure 5 for the purpose of illustrating the first flow regulator of the motion damper, with which the motion of the displacement element on its main path can be damped,

[0063] Figure 7 shows a partially cutaway perspective view of the liquid chamber shown in Figure 5 and Figure 6 for the purpose of illustrating the second flow regulator of the motion damper, with which the motion of the displacement element on the last part of its path to the end position can be damped,

[0064] Figure 8 a perspective view of the fail-safe drive is shown for illustrating the two end position switches of the elastic bearing of the fail-safe drive,

[0065] Figure 9 a detail section of one of the two end position switches shown in Figure 8

[0066] Figure 10 a perspective view of the components of the fail-safe drive is shown for illustrating the cam disc with its three control curves, a respective one of the three output rollers of the output disc of the fail-safe drive being assigned to the control curves,

[0067] Figure 11 a perspective view of the adjustment drive connected to the fail-safe drive shown in the previous figures, and

[0068] Figure 12 a sectional view of the combination of adjustment drive and fail-safe drive shown in Figure 11 DETAILED DESCRIPTION

[0069] All figures show at least parts of a fail-safe drive designated as a whole with 1.

[0070] The fail-safe drive 1 has an output shaft 3 and an input shaft 4. Between the support shaft 2 and the input shaft 4 a planetary gear 24 is provided, which converts the drive torque acting on the input shaft 4 and transmits it to the support shaft 2 and further to the output shaft 3.

[0071] The adjustment drive shown in Figure 10 and 11 is coupled to the input shaft 4 by means of a coupling device, here a sliding key, in order to drive the support shaft 2 and further the output shaft 3 in normal operation. The fail-safe drive 1 serves to operate the output shaft 3 and to move a valve or fitting connected to the output shaft 3 into a defined position, preferably into a closed position, in the event of a current failure.

[0072] In this example, the fail-safe drive 1 thus forms a fail-safe unit, which can be equipped as a module on the adjustment drive 42. The adjustment drive 42 is shown in Figure 11 and 12 and is connected to the input shaft 4 of the fail-safe drive 1. In further embodiments, the fail-safe drive and the adjustment drive are formed integrally with one another.

[0073] ​​The failsafe drive 1 has a mating element 5 in the form of an output disk 9, which is at least indirectly connected with the output shaft 3 of the failsafe drive 1.

[0074] Figure 1 The sectional view illustrates that the failsafe drive 1 has a drive accumulator 6, which comprises fourteen reset elements in the form of disc springs 7. Each of the disc springs 7 has a non-linear spring characteristic curve.

[0075] The failsafe drive 1 also has a cam disk 8, which cooperates with the previously mentioned mating element 5, i.e. the output disk 9. The cam disk 8 is arranged axially movably on the carrier shaft 2. The cam disk 8 and the mating element 5 are designed for jointly converting an axial movement of the disc springs 7 into a rotational movement of the output shaft 3 of the failsafe drive 1. In the shown embodiment, the axial movement of the disc springs 7 is an axial relaxation movement of the disc springs 7.

[0076] By means of the axial relaxation movement of the disc springs 7 of the drive accumulator 6, the cam disk 8 can be moved axially along the carrier shaft 2 in order to actuate the output disk 9, which is at least indirectly connected with the output shaft 3, and thus to move the output shaft 3 into a position set for an emergency situation, even if the coupled adjustment drive is no longer functional, for example due to a current failure. In a further embodiment of the failsafe drive 1, a kinematic reversal of the working principle described before and which will be described in more detail below is realized. Here, the mating element 5 is then axially loaded and moved axially by the disc springs 7 and the cam disk 8 is put into rotation in order to move the output shaft 3 of the failsafe drive 1 into a position set for an emergency situation.

[0077] The cam disk 8 has three control curves 10, which are arranged uniformly distributed around its axis of rotation. The control curves 10 each have a course which is coordinated with the non-linear spring characteristic curve of the disc springs 7, such that a constant drive torque is generated upon activation of the failsafe drive 1.

[0078] As already mentioned before, the cam disk 8 is guided longitudinally movably on the carrier shaft 2. For this purpose, the carrier shaft 2 has a corresponding guide structure on its outer side in the form of grooves and slats. Corresponding mating grooves and mating slats are provided on the cam disk 8 of the failsafe drive 1. Thus, the cam disk 8 is guided longitudinally movably on the carrier shaft 2, however is not rotatably relative to this carrier shaft.

[0079] The axially movable cam disk 8 together with the output disk 9 forms a cam drive with which the axial movement of the cam disk 8, which is caused by the disc spring 7 driving the accumulator 6, can be transmitted to the output disk 9 via the control curve 10 and the output rollers 11 which cooperate with the control curve 10, respectively, and converted into a rotational movement of the output disk 9.

[0080] The output disk 9 has three output rollers 11 in total, which are arranged uniformly at an angular spacing of 120° about the rotational axis of the output disk 9. The output disk 9 thus has a plurality of output rollers 11 which correspond to the plurality of control curves 10 of the cam disk 8.

[0081] The output rollers 11 are arranged rotatably on the output disk 9 and serve to convert the axial movement of the cam disk 8 into a rotational movement of the output disk 9. When the cam disk 8 moves axially, the output rollers 11 roll along the control curve and cause a rotational movement of the output disk 9 relative to the cam disk 8 which is non-rotatably connected to the support shaft 2. The relative rotation between the cam disk 8 and the output disk 9 is made possible by the unlocking between the support shaft 2 and the output disk 9. This locking will be described further below.

[0082] The fail-safe drive 1 also has an adjustment display 12 for its output disk 9. In Figure 4 a perspective view the adjustment display 12 can be seen. By means of a curved rack 25 which is fixedly connected to the output disk 9, the movement of the output disk 9 is transmitted via a drive shaft 26 with two pinions to a second rack 27. The second rack 27 is connected to a display element 28. The display element 28 can be moved by the movement of the output disk 9 into a viewing window 29 of a housing 30, whereby the position of the output disk 9 can be read from the outside.

[0083] The mating element 5 of the fail-safe drive 1, in this case the output disk 9, is at least indirectly coupled with a movement damper 13. The movement damper 13 is shown, for example, in Figure 5 .

[0084] The movement damper 13 comprises a liquid chamber 14 which is filled with a liquid, for example with oil, and at least one displacement element 15 which is movable in the liquid chamber. The displacement element 15 is coupled with the support shaft 2 and thus at least indirectly connected with the mating element 5, that is to say the output disk 9.

[0085] The degree of damping of the movement damper 13 is adjustable. The adjustment of the degree of damping can be carried out by means of its two flow regulators 16 and 17 in total, which can be seen in Figure 6 and 7 partially sectioned views.

[0086] By means of the two flow regulators 16 and 17, the motion damper 13 is also designed to provide different damping degrees along the adjustment path of the displacement element 15 through the liquid chamber 14. It is provided here that the damping degree provided by the motion damper 13 is greater in the range of the end positions of the displacement element 15 on its adjustment path through the liquid chamber 14 than in the range of the adjustment path of the displacement element 15 between the end positions.

[0087] Figure 6 and Figure 7 It is clarified that two outlet openings 31 and 32 are provided within the liquid chamber 14, through which the liquid expelled by the displacement element 15 can be supplied to the two flow regulators 16 and 17.

[0088] On its main path, the displacement element 15 expels liquid in such a way that liquid can be expelled from the liquid chamber 14 through the two outlet openings 31 and 32 and can be supplied to the two flow regulators 16 and 17. As soon as the displacement element 15 passes the outlet opening 31 for the main path, the liquid expelled by the displacement element 15 can only flow out of the liquid chamber 14 through the outlet opening 32 for the end position and be supplied to the flow regulator 17 for the end position. This results in a comparatively increased damping degree, so that the fail-safe drive 1, the adjustment drive 42 and the accessory or machine component to be actuated by means of the adjustment drive 42 are reliably protected from impact loads when the output shaft 3 is moved into its end position.

[0089] The outlet openings 31 and 32 are connected to the flow regulators 16 and 17 via respective channels. Through a return flow channel 33, the oil expelled from the liquid chamber 14 through the outlet openings 31 and 32 on one side is again supplied to the liquid chamber 14.

[0090] Figure 4 A locking device 18 of the fail-safe drive 1 is shown. By means of this locking device 18, the disc spring 7 of the drive accumulator 6 can be kept under tension. This is achieved in that, as already shown before, the locking device 18 fixes, in particular rotationally fixes, the output disc 9 relative to the carrier shaft 2 and relative to the cam disc 8.

[0091] For this purpose, the locking device 18 has a locking mechanism 19 which is held in the vicinity of a locking position by a return mechanism 20, here by a return spring. In said position, the locking mechanism 19 has not yet connected the output disc 9 to the carrier shaft 2. In addition, the locking device 18 also comprises a holding magnet 21 with which the locking mechanism 19 can be brought into its locking position against the return force of the return mechanism 20 and be held.

[0092] The locking mechanism 19 is a latching lever which is connected via a lever arm to the reset mechanism 20 and which, in its locking position, engages into a corresponding latching recess 34 on the output disc 9 and thus connects the output disc 9 with the carrier shaft 2 in a rotationally fixed manner. The locking device has a latching carrier 35 which is connected with the carrier shaft 2 in a rotationally fixed manner.

[0093] In the event of a current fault or in the event of an emergency triggering, that is to say when the holding magnet 21 is no longer active or is without current, the locking mechanism 19 is no longer held in its locking position. By means of the torque acting onto the output disc, the locking mechanism 19 is moved on the output disc 9. The rotationally fixed connection provided by the locking device 18 between the output disc 9 and the carrier shaft 2 is cancelled.

[0094] By cancelling the rotationally fixed connection, the output disc 9 can be rotated relative to the cam disc 8. The drive accumulator 6 with its stacked disc springs 7 is thus activated and moves the cam disc 8 axially on the carrier shaft 2 and in doing so causes a rotation of the output disc 9, by means of which the output shaft 3 and ultimately the accessories and / or machine components connected to it can be brought into a set position provided for emergency situations. Upon reactivation of the holding magnet 21, the reset mechanism 20 assists in the possibility of the locking mechanism 19 being brought again into its locking position.

[0095] The fail-safe drive 1 has a test stop 22. The test stop 22 is visible in Figure 10 and can be moved from a non-use position into a use position. The use position into which the test stop 22 can be moved lies between two end positions of the output disc 9, wherein one end position of the output disc 9 is assigned to a tensioned position of the plurality of disc springs 7 of the drive accumulator 6 of the fail-safe drive 4 and the second end position is assigned to a relaxed position of the plurality of disc springs 7 of the drive accumulator 6 of the fail-safe drive 4. The locking bolt serves as the test stop 22, which is moved from its initial position shown in Figure 10 into its use position.

[0096] If the test stop 22 is moved electromechanically into its use position, the functionality of the fail-safe drive 1 can be checked without the output shaft 3 being moved completely into its position provided for emergency situations. It is thus possible that, if the fail-safe drive 1 should be triggered for testing purposes, the drive energy stored in the drive accumulator 6 does not have to be completely released.

[0097] In order to manipulate the test stop 22, an electromechanical actuator 36 is provided, which is likewise visible in Figure 10 . The actuator 36 moves the test stop 22 into its use position, in which it limits the rotational angle range within which the output disc 9 can rotate.

[0098] The fail-safe drive 1 has a total of two end position switches 23 in the form of a respective one microswitch. The end position switches 23 are shown, for example, in Figure 8 and Figure 9 The end position switches 23 are elastically supported in a holding device 39 by means of spring means 38 and are arranged in the housing 30 of the fail-safe drive 1. The end position switches 23 are assigned to the engagement element 5 of the fail-safe drive 1. When the engagement element 5 reaches its end position, the engagement element comes into contact with the end position switch 23 by means of one of its two stop pieces 40. The stop pieces 40 are rotatably supported on the engagement element 5 in order to enable the stop pieces 40 to lie flat against the end stop switch 23 assigned to them. When the engagement element 5, here the output disc 9, of the fail-safe drive 4 loads the end position switch 23, the end position switch 23 is protected from damage by the elastic support of the end position switch 23. Each end position switch 23 is assigned an adjustment screw 41. By means of the adjustment screw 41 it is possible to change the position of the holding device 39 and thus also the position of the end stop switch 23.

[0099] Figure 11 and Figure 12 The combination of the adjustment drive 42 with the fail-safe drive 1 is shown. The adjustment drive 42 has a drive motor 43. The drive motor 43 is connected to an output shaft 45 of the adjustment drive 42. In order to transmit torque, the output shaft 45 is connected to the input shaft 4 of the fail-safe drive 1 by means of a worm gear 47. In this way, the output disc 9 of the fail-safe drive 1 is also at least indirectly connected to the output shaft 45 of the adjustment drive 42.

[0100] The output shaft 45 is fixable. In the embodiment shown, the fixation of the output shaft 45 is effected by means of the worm gear 47 described earlier, which is a self-locking transmission. In this way, it is prevented that the drive motor 43 of the adjustment drive 42 is rotated by the activated fail-safe drive 1. The fixation of the drive motor 43 ultimately results in that, when the drive motor 43 is without current, the support shaft 2 of the fail-safe drive 1 is held by the drive motor 43 support shaft 2 non-rotatably relative.

[0101] The adjustment drive 42 has an electrical interface 44. The adjustment drive 42 can also be manually operated by means of a hand wheel 46 if required.

[0102] This invention relates to improvements in the technical field of adjusting drive devices. Specifically, a fail-safe drive device 4 for adjusting drive device 1 is proposed, the fail-safe drive device having a drive accumulator 6 comprising at least one disc spring 7 and / or cam disc 8 for converting the axial drive motion of a reset element into rotary drive motion.

[0103] List of reference numerals

[0104] 1 Fail-safe drive

[0105] 2-bracket shaft

[0106] 3 output shafts

[0107] 4 input axes

[0108] 5 mating components

[0109] 6-drive accumulator

[0110] 7 disc springs

[0111] 8 Cam Discs

[0112] 9 output disks

[0113] 10 Control Curve

[0114] 11 Output Rollers

[0115] 12 Adjust the display device

[0116] 13 Motion Dampers

[0117] 14 Liquid Chambers

[0118] 15 Extrusion Components

[0119] 16 Flow regulators for the main path

[0120] 17 Flow regulator for end positions

[0121] 18 locking devices

[0122] 19 Locking Institutions

[0123] 20 Reset Mechanism

[0124] 21 Holding magnets

[0125] 22 Test stop components

[0126] 23 End Position Switch

[0127] 24 planetary gear transmission device

[0128] The first rack on 259

[0129] 26 drive shafts

[0130] 27 second rack

[0131] 28 display element

[0132] 29 viewing window

[0133] 301 housing

[0134] 31 outlet opening for main path

[0135] 32 outlet opening for end position

[0136] 33 backflow channel

[0137] 34 latching clearance

[0138] 35 latching support

[0139] 36 electromechanical actuator

[0140] 372 guide mechanism on

[0141] 38 spring device for 23

[0142] 39 holding device for 23

[0143] 405 / 9 stop

[0144] 41 adjustment screw for 23

[0145] 42 adjustment drive

[0146] 43 drive motor

[0147] 4442 electrical interface

[0148] 4542 output shaft

[0149] 46 hand wheel

[0150] 47 worm gear

Claims

1. A fail-safe drive device (1) for adjusting a drive unit, wherein, The fail-safe drive (1) has a cam disk (8), at least one reset element including a reset spring, a mating element (5), and an output shaft (3), wherein the cam disk (8) and the mating element (5) are designed to convert the axial movement of the reset element along the output shaft (3) into the rotational movement of the output shaft (3), characterized in that the cam disk (8) has at least one control curve (10), the direction of which is coordinated with the spring characteristic curve of the at least one reset element, so that a constant driving motion and / or a constant driving torque can be generated when the fail-safe drive (1) is activated.

2. The fail-safe drive device (1) according to claim 1, wherein, The reset spring and / or the drive accumulator (6) including at least one disc spring (7) is configured as at least one reset element.

3. The fail-safe drive device (1) according to claim 2, wherein, The return spring is at least one disc spring (7).

4. The fail-safe drive device (1) according to claim 2, wherein, The at least one disc spring (7) of the drive accumulator (6) has a non-linear spring characteristic curve.

5. The fail-safe drive device (1) according to any one of claims 1 to 4, wherein, The mating element (5) is rotatable by the axial movement of the cam disk (8) caused by the reset element, and the output shaft (3) is rotatable by the rotational movement of the mating element (5); or the cam disk (8) is rotatable by the axial movement of the mating element (5) caused by the reset element, and the output shaft (3) is rotatable by the rotational movement of the cam disk (8).

6. The fail-safe drive device (1) according to any one of claims 1 to 4, wherein, The mating element (5) or the cam disk (8) is an output disk (9), and / or the mating element (5) or the cam disk (8) is at least indirectly connected to or has been connected to the input shaft (4).

7. The fail-safe drive device (1) according to claim 6, wherein, The connection between the mating element (5) or the cam disk (8) and the input shaft (4) is detachable.

8. The fail-safe drive device (1) according to claim 4, wherein, The direction of the control curve is coordinated with the nonlinear spring characteristic curve of the at least one disc spring (7), so that a constant driving motion and / or a constant driving torque can be generated when the fail-safe drive device (1) is activated.

9. The fail-safe drive device (1) according to any one of claims 1 to 4, wherein, The cam disk (8) is a spherical cam disk.

10. The fail-safe drive device (1) according to claim 2, wherein, The drive accumulator (6) includes at least two layered disc springs (7).

11. The fail-safe drive device (1) according to claim 10, wherein, The at least two layered disc springs (7) have non-linear spring characteristic curves.

12. The fail-safe drive device (1) according to any one of claims 1 to 4, wherein, The cam disk (8) has at least two control curves (10).

13. The fail-safe drive device (1) according to claim 12, wherein, The cam disk (8) has at least two control curves (10) that are evenly distributed around the axis of rotation of the cam disk (8).

14. The fail-safe drive device (1) according to claim 12, wherein, The cam disk (8) has three or more control curves (10).

15. The fail-safe drive device (1) according to any one of claims 1 to 4, wherein, The mating element (5) has at least one output roller (11).

16. The fail-safe drive device (1) according to claim 15, wherein, The number of output rollers (11) included in the cooperating element (5) corresponds to the number of control curves (10) of the cam disk (8).

17. The fail-safe drive device (1) according to claim 15, wherein, The output rollers (11) are evenly distributed around the rotation axis of the mating element (5).

18. The fail-safe drive device (1) according to claim 15, wherein, The at least one output roller (11) is guided in the use position along the control curve (10) of the cam disk (8) to the output roller.

19. The fail-safe drive device (1) according to claim 6, wherein, The output disk (9) has at least one output roller (11).

20. The fail-safe drive device (1) according to claim 19, wherein, The number of output rollers (11) included in the output disk (9) corresponds to the number of control curves (10) of the cam disk (8).

21. The fail-safe drive device (1) according to claim 19, wherein, The output rollers (11) are evenly distributed around the rotation axis of the mating element (5).

22. The fail-safe drive device (1) according to claim 19, wherein, The at least one output roller (11) is guided in the use position along the control curve (10) of the cam disk (8) to the output roller.

23. The fail-safe drive (1) according to any one of claims 1 to 4, wherein the fail-safe drive has an adjustment display device (12) for displaying the position of the output shaft (3) of the fail-safe drive.

24. The fail-safe drive device (1) according to any one of claims 1 to 4, wherein, The output shaft (3) is at least indirectly coupled to the motion damper (13).

25. The fail-safe drive device (1) according to claim 24, wherein, The output shaft (3) is at least indirectly coupled to the motion damper (13) via the mating element (5) or the cam disk (8).

26. The fail-safe drive device (1) according to claim 24, wherein, The motion damper (13) includes a liquid chamber (14) and at least one expulsion element (15) that can move in the liquid chamber, wherein the expulsion element (15) is at least indirectly connected to or can be connected to the output shaft (3).

27. The fail-safe drive device (1) according to claim 26, wherein, The liquid chamber (14) is filled with oil.

28. The fail-safe drive device (1) according to claim 26, wherein, The extrusion element (15) is connected or can be connected to the output shaft (3) via the mating element (5) or the cam disk (8).

29. The fail-safe drive device (1) according to claim 24, wherein, The damping degree of the motion damper (13) is adjustable.

30. The fail-safe drive device (1) according to claim 29, wherein, The damping degree of the motion damper (13) can be adjusted by means of the flow regulator (16, 17).

31. The fail-safe drive device (1) according to claim 26, wherein, The motion damper (13) provides different degrees of damping along the adjustment path of the expulsion element (15).

32. The fail-safe drive device (1) according to claim 31, wherein, The damping of the extrusion element (15) in the range of its end positions along the adjustment path through the liquid chamber (14) is greater than the damping of the extrusion element (15) in the range of its adjustment path between the end positions.

33. The fail-safe drive device (1) according to claim 2 or 3, wherein, The fail-safe drive (1) has a locking device (18) which can keep at least one disc spring (7) tensioned, and / or can fix the mating element (5) or the cam disk (8) relative to the input shaft (4), and / or can fix the mating element (5) and the cam disk (8) relative to each other.

34. The fail-safe drive device (1) according to claim 33, wherein, The locking device (18) includes a locking mechanism (19).

35. The fail-safe drive device (1) according to claim 34, wherein, The locking mechanism is arranged in an initial position near the locking position with a reset mechanism (20).

36. The fail-safe drive device (1) according to claim 34, wherein, The locking mechanism is positioned in its initial position near the locking position by a return spring.

37. The fail-safe drive device (1) according to claim 34, wherein, The locking device (18) includes a holding magnet (21) by means of which the locking mechanism (19) can be placed and / or held in its locked position.

38. The fail-safe drive device (1) according to claim 2, wherein, The fail-safe drive device (1) has a test stop (22) that can move from a non-use position to a use position, which is arranged between the tensioned and relaxed positions of at least one disc spring (7) of the drive accumulator (6) and / or between the two end positions of the mating element (5) or the cam disk (8).

39. The fail-safe drive device (1) according to claim 38, wherein, The test stop (22) provides rotational limitation for the mating element (5) and / or the cam disk (8).

40. The fail-safe drive device (1) according to claim 38, wherein, The test stop (22) is electromechanically movable between its non-use position and its use position.

41. The fail-safe drive device (1) according to claim 38, wherein, The cam disk (8) or mating element (5) of the fail-safe drive device (1) is longitudinally movably supported on the support shaft (2).

42. The fail-safe drive device (1) according to claim 41, wherein, The cam disk (8) or the mating element (5) and the support shaft (2) have guide mechanisms (37) constructed corresponding to each other.

43. The fail-safe drive device (1) according to claim 41, wherein, The cam disk (8) or mating element (5) of the fail-safe drive device (1) is connected to the support shaft (2) in a non-rotatable manner.

44. The fail-safe drive device (1) according to any one of claims 1 to 4, wherein, An end position switch (23) that is movably supported is provided for at least one end position of the fail-safe drive (1).

45. The fail-safe drive device (1) according to claim 44, wherein, The end position switch (23) is elastically supported.

46. ​​The fail-safe drive device (1) according to claim 44, wherein, The end position switch (23) is a miniature button.

47. The fail-safe drive device (1) according to claim 44, wherein, The end position switch (23) is provided to the cooperating element (5) or cam disk (8) of the fail-safe drive device (1).

48. An adjustment drive device (42), wherein, An end position switch (23) movably supported is provided for at least one end position of the adjustment drive device, wherein the adjustment drive device (42) has a fail-safe drive device (1) according to any one of claims 1 to 47.

49. The adjustment drive device (42) according to claim 48, wherein, The end position switch (23) is elastically supported.

50. The adjustment drive device (42) according to claim 48, wherein, The end position switch (23) is a miniature button.

51. The adjustment drive device (42) according to claim 48, wherein, The end position switch (23) is provided to the cooperating element (5) of the fail-safe drive device (1).

52. An adjustment drive device (42) having an output shaft (45) and a drive motor (43) at least indirectly connected to the output shaft (45) for transmitting torque, and the adjustment drive device having a fail-safe drive device (1) according to any one of claims 1 to 47.

53. The adjustment drive device (42) according to claim 52, wherein, The adjustment drive device (42) is the adjustment drive device according to any one of claims 48 to 51.

54. The adjustment drive device (42) according to claim 48 or 52, wherein, The output shaft (45) of the adjustment drive (42) is fixed, and / or the adjustment drive (42) has a handwheel (46).

55. The adjustment drive device (42) according to claim 54, wherein, The output shaft (45) of the adjustment drive device (42) can be fixed by means of a brake and / or by means of a self-locking transmission device.

56. The adjustment drive device (42) according to claim 54, wherein, The output shaft (45) of the adjustment drive device (42) can be fixed by means of a self-locking worm gear transmission device (47).

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