Electric locking unit

Abstract

An electric locking unit (1) with a coupling device (8) is described, wherein the coupling device (8) has an electric motor (9) with a worm shaft (11) with a helical winding, a spring element (18), and a coupling member (19). The coupling member (19) is mounted so as to be axially displaceable in the direction of extension of the worm shaft (11) and has a contour designed for mechanical coupling to a closure element (4). The spring element (18) is connected to the coupling member (19) by a distal end section (24) and is coupled to the worm shaft (11) of the electric motor (9) by the opposite proximal end section (26) so as to be axially displaceable in order to convert a rotation of the worm shaft (11) into a linear movement of the proximal end section (26) of the spring element (18).The worm shaft (11) is in freewheeling mode when the spring element (18) is compressed or stretched into a pre-tensioned position and one of the two end positions of the locking cylinder (2) is reached in the engaged or disengaged state. The proximal end section (26) of the spring element (18) has a reduced diameter over more than one wrap of the worm shaft (11) such that the spring element (18) can engage with the worm shaft (11) with this at least one wrap.

Description

The invention relates to an electrical closing unit having a coupling device, wherein the coupling device has an electric motor with a worm shaft with a helical winding, a spring element and a coupling member, wherein the coupling member is mounted axially displaceably in the direction of extent of the worm shaft and has a contour designed for mechanical coupling with a closure element, and wherein the spring element is connected with the coupling member by a distal end section and is coupled axially displaceably with the worm shaft of the electric motor by the opposite proximal end section in order to convert a rotation of the worm shaft into a linear movement of the proximal end section of the spring element, wherein the worm shaft is in free-wheeling state when one of the two end positions of the locking cylinder is reached in the coupled-in or decoupled state with the spring element compressed or extended into a pre-stressing position.EP 1 576 246 B1 discloses such a locking device for a locking system by actuating a lock cylinder of a lock by rotating a key or door knob. In this case, a coupling element and electronically controlled drive means connected to the housing and having propulsion means for moving the coupling element are provided. In the second clutch state, in which an output element couples to the rotor, the clutch element can be moved away from the propulsion means by a rotational movement of the rotor. This ensures that the coupling only occurs in a single singular state and reduces the probability that the coupling element will enter the second coupling state by random excitations. This is achieved by a coupling element mounted so as to be movable radially with respect to the direction of extension of the rotor.EP 1 522 658 B1 discloses an electric lock in which a slide is linearly displaceable with the aid of a spring element. The spring element engages with an end section in a spindle shaft of an electric motor in order to displace the slide coupled to the spring element during rotation of the spindle shaft.WO 98 / 15703 A1 describes an electromechanical lock having an electric motor, the shaft of which is connected to a compression spring. This compression spring forms a flexible shaft which is connected at its distal end to a knob shaft. A pin of an axially slidable coupling member engages a worm shaft of a helically shaped wire on the knob shaft to axially displace a coupling member.EP 2 927 395 A1 discloses a lock cylinder with a coupling arrangement, in which a slide element engages with a worm shaft for converting a rotational movement of the worm shaft into an axial movement of the slide element with respect to the switching axis. A clutch device can be displaced by means of a drive device via the slide element parallel to the shifting axis. The slide element is covered by two spring elements with force accumulators in both axial directions.DE 10 2019 113 666 B4 discloses a lock cylinder having a cylinder housing, a lock bit rotatably mounted in the cylinder housing, a knob shaft rotatably mounted in the cylinder housing, a coupling device in the knob shaft for mechanically coupling the knob shaft to the lock bit, and control electronics which are connected to the coupling device for electronically coupling the knob shaft and the lock bit in and out with the coupling device, wherein the coupling device has an electric motor with a shaft, a spring element and a coupling member, wherein the coupling member is mounted on the knob shaft so as to be axially displaceable in the direction of extent of the knob shaft and has a contour designed for mechanically coupling to the lock bit, and in that the spring element is connected with a distal end section to the coupling member and is coupled with the opposite proximal end section in an axially displaceable manner to the shaft of the electric motor in order to convert a rotation of the shaft into a linear movement of the proximal end section of the spring element.On the basis of this, it is the object of the present invention to provide an improved electrical closing unit which ensures an improved interaction of components for reliable operation with simple assembly, with a simple and compact construction.The object is achieved with the electric locking unit having the features of claim 1 and by the electric locking unit in the form of a locking cylinder having the features of claim 10. Advantageous embodiments are described in the dependent claims.It is proposed that the proximal end section of the spring element has a diameter reduced in such a way via at least one wrap of the worm shaft that the spring element can engage with this at least one wrap of the worm shaft.The coupling of the spring element to the worm shaft is thus improved, In particular, the threading of the proximal end from the freewheel into the coupled-in state is improved. The risk of tilting is thereby reduced and the transition from coupled-out into the coupled-in state is equalized. The mounting of the spring element on the worm shaft is also very simple and reliable due to the improved threading. For the freewheel, the angle degree of more than 320°, i.e. of at least a single wrap, is limited to a maximum angle degree which allows the section of the spring element to be accommodated axially next to the helical winding of the worm shaft. The wrap should preferably not exceed more than a 3-fold wrap, i.e. an angle degree of 960°.The worm shaft can be free-wheeling when one of the two end positions of the closing unit is reached in the coupled-in or coupled-out state. A free wheel of the worm shaft is present whenthe coupling element is decoupled from the closure element in its end position displaced away from the closure element;the coupling member is coupled into the end position displaced into the coupling contour of the closure element;the coupling member on the closure element has been moved to a block, but is not coupled into the coupling contour of the closure element, wherein the spring element is compressed and acts as an energy store;the coupling member is clamped on the coupling contour of the closure element when it is moved back into the decoupled end position and is thereby prevented from being decoupled, wherein the spring element is compressed and acts as an energy store.The spring element is compressed or stretched into a pre-tensioning position.Preferably, the proximal end section of the spring element has a diameter reduced by 1.5 to 2 times the wrap around the worm shaft such that the spring element can engage with the worm shaft by this 1.5 to 2 times the wrap around. However, a further wrap, for example a wrap of 2 to 3 times, i.e. an angle degree of 640° to 960°, is also conceivable, but not a wrap over the entire length of the helical winding of the worm shaft.The coupling member can have a polygonal outer contour. The clutch member is thus mounted axially displaceably in a rotationally fixed manner. The form-fit of the outer contour of the coupling member is distributed over the outer circumference by the polygonal shape and is not limited to edged guide regions. The risk of tilting of the coupling member in its mounting, for example in a coupling shaft, is reduced. Thus, low frictional resistance for axial displacement can be secured.A cylindrical outer contour of the coupling member is advantageous, wherein at least one projection protrudes from the outer periphery of the cylinder. In this case, at least one cuboid projection is arranged on the outer periphery of the cylindrical outer contour in order to enter a correspondingly contoured latching depression and to form a positive fit there for the mechanical coupling.For this purpose, a pair of cuboidal projections on the outer periphery of the cylindrical outer contour of the coupling member can project from the outer periphery in opposite directions from one another.The coupling member may comprise a spring retaining core and a coupling element, wherein the coupling element has a receiving opening for receiving the spring retaining core pressed into the receiving opening with an interference fit. The spring holding core may have a support portion protruding toward the worm shaft. The distal end of the spring element wraps around the support section with at least two wraps and is connected to the support section in a force-fit manner. This achieves a reliable force-fit connection of the spring element to the coupling member.The coupling member can have a receiving opening for receiving the distal end of the spring element, which opening abuts a tube wall delimiting the receiving opening. The coupling member can have at least one deformation region at which the tube wall is deformed with a deformation section into the interior of the receiving opening. The distal end of the spring element received in the receiving opening is connected in a positive-locking manner to the coupling member by the deformation section protruding into the interior of the receiving opening. The assembly with a stable connection of the spring element to the coupling element is achieved in a simple manner by deforming the coupling element at the at least one deformation region after the spring element is inserted into the receiving opening.The distal end of the spring element can abut the end face delimiting the receiving opening, wherein at least two wraps of the distal end of the spring element are arranged between the end face and the deformation section.The spring element is preferably a compression spring, i.e. a helical spring, which expands in the extension direction due to its spring elasticity and can be compressed against the spring force.The electric locking unit can be designed as a locking cylinder with a cylinder housing, a locking bit rotatably mounted in the cylinder housing and a knob shaft rotatably mounted in the cylinder housing. The clutch device is formed in the knob shaft for mechanically coupling the knob shaft to the lock bit. Control electronics are connected to the clutch device for the electronic coupling and decoupling of the knob shaft and the lock bit. Such a lock cylinder can be inserted into a lock, for example a door lock, with a simple and robust construction, in order to open or close it with the aid of the lock bit. For this purpose, the locking bit is rotated by rotation on the knob shaft when the locking bit is coupled to the knob shaft in the coupled state.The invention is also achieved by an electrical locking unit in the form of a locking cylinder which has a cylinder housing, a locking bit mounted rotatably in the cylinder housing, a knob shaft mounted rotatably in the cylinder housing, and a coupling device. The clutch device is arranged in the knob shaft and is designed for mechanically coupling the knob shaft to the locking bit. The coupling device has an electric motor with a worm shaft with a helical winding, a spring element and a coupling member. The coupling member is mounted axially displaceably in the direction of extent of the worm shaft and has a contour designed for mechanical coupling to a closure element. The spring element is connected with a distal end section to the coupling member and coupled with the opposite proximal end section in an axially displaceable manner to the worm shaft of the electric motor in order to convert a rotation of the worm shaft into a linear movement of the proximal end section of the spring element, wherein the worm shaft is in free-wheeling state when one of the two end positions of the locking cylinder is reached in the coupled-in or coupled-out state. A free wheel of the worm shaft can also be present if the coupling member on the closure element has been moved to a block without being coupled in, wherein the spring element is compressed and acts as an energy store, or is blocked by clamping on the closure element when being decoupled, wherein the spring element is stretched and acts as an energy store.It is proposed that the coupling member has a polygonal outer contour.The clutch member is thus mounted axially displaceably in a rotationally fixed manner. The form-fit of the outer contour of the coupling member is distributed over the outer circumference by the polygonal shape and is not limited to edged guide regions. The risk of tilting of the coupling member in its mounting, for example in a coupling shaft, is reduced. Thus, low frictional resistance for axial displacement can be secured.A drill guard may be disposed in the knob shaft on the side of the electric motor opposite the shaft. Thus, a sabotag is counteracted by drilling open from the side of the electric locking unit, in particular of the lock cylinder, which is located on the unsecured outer side.The electrical closing unit can have control electronics which are preferably integrated into the closing unit and are connected to the electric motor and are configured for the electronic coupling and decoupling of the coupling element. The control electronics can optionally, however, also be arranged outside the electrical closing unit and can be coupled to the electric motor in a wired or wireless manner.The invention is explained in more detail below with reference to an exemplary embodiment with the attached drawings. The following are shown: FIG. 1 is a side sectional view of a lock cylinder in the uncoupled state; FIG. 2 shows a side detail view of the locking cylinder from FIG. 1 in the region of the coupling device; FIG. 3 is a side sectional view of a locking cylinder with a prestressed spring element; FIG. 4 shows a side detail view of the locking cylinder from FIG. 3 in the region of the coupling device; FIG. 5 is a side sectional view of a locking cylinder in the coupled-in state; FIG. 6 shows a side detail view of the locking cylinder from FIG. 5 in the region of the coupling device; FIG. 7 is a front view of the polygonal coupling member; FIG. 8 is a side sectional view of the coupling member with spring retaining core and coupling element and spring element connected in a force-fit manner to a bearing section of the spring retaining core; FIG. 9 is a side view of the coupling member of FIG. 8; FIG. 10 is a side view of another embodiment of a coupling member with a spring element connected thereto; FIG. 11 is a side sectional view of the coupling member of FIG. 10 with deformation regions; FIG. 12 is a side sectional view of the coupling member from FIG. 11 in the region of a deformation region with a spring element connected in a form-fitting manner there; FIG. 13 is a perspective view of a cylindrical coupling member having a pair of parallelepipedal projections; FIG. 14 is a front view of the cylindrical coupling member of FIG. 13; FIG. 15 is a side view of the coupling member from FIG. 13 with spring retaining core and coupling element and spring element connected in a force-fitting manner to a bearing section of the spring retaining core; FIG. 16 is a side sectional view of the coupling member of FIG. 15 ; FIG. 17 shows a side detail view of the coupling member from FIG. 16 in the region of a deformation region with a spring element connected there in a form-fitting manner.FIG. 1 shows a side sectional view of an electric locking unit 1 in the form of a locking cylinder 2 for a lock (not shown) in the decoupled state.The locking cylinder 2 has a cylinder housing 3, in which a closure element 4 in the form of a locking bit 4 ais rotatably mounted. The lock bit 4a has in the usual manner a finger 5 projecting from the axis of rotation of the lock bit 4a for actuating a lock of a lock when the lock cylinder 2 is installed in a lock.A knob shaft 6 is also inserted into the cylinder housing 3, which is rotatably mounted there. An actuating knob 7 can be placed on the end of the knob shaft 6 protruding from the cylinder housing 3.In this knob shaft 6, a coupling device 8 is installed, which is designed for mechanically coupling the knob shaft 6 to the locking bit 4 a. This coupling device 8 has an electric motor 9 with a shaft 10, onto which a worm shaft 11 is pressed. However, the worm shaft 11 can also be formed integrally with the shaft 10 of the electric motor 9. The worm shaft 11 has a threaded web which extends circumferentially over the circumference of the worm shaft 11 in the direction of extension of the worm shaft 11, i.e. a helical winding.The electric motor 9 is controlled by control electronics 12. This control electronics 12 can preferably have a radio signal receiver 13 in order to wirelessly receive opening and closing signals. The radio signal receiver 13 can be designed for near field (NFC, e.g. RFID) and / or far field reception (e.g. Bluetooth, ZigBee, WiFi).The clutch device 8 is installed in a torque-proof manner in a knob shaft 14 An actuating knob 15 is mounted in a torque-proof manner on the knob shaft 14. The knob shafts 6, 14 are each installed in an aligned bore of the cylinder housing 3 and are each secured in a positive-locking manner against axial displacement by a securing screw 16 a, 16 b. The knob shafts 6, 14 have a circumferential groove 17 a, 17 bat their outer circumference, into which the respective securing screw 16 a, 16 bmerges without a contact pressure being exerted in the radial direction on the respective knob shaft 6, 14. This ensures that the knob shafts 6, 14 are mounted rotatably about their axis in the cylinder housing 3.The coupling device 8 has a spring element 18 in the form of a helical spring (for example. Compression spring). The proximal end section of the spring element 18 closest to the electric motor 9 can engage with the worm shaft 11 with an at least simple wrap in order to cause an axial displacement during a rotation of the worm shaft 11.In the exemplary embodiment shown, the spring element 18 is connected in a rotationally fixed manner by the distal end to a coupling member 19. The coupling member 19 has a spring retaining core 20 and a coupling member 21, and the spring retaining core 20 is press-fitted into a receiving hole of the coupling member 21. The distal end of the spring element 18 wraps around the spring retaining core 20 and is supported in a form-fit and force-fit manner between the spring retaining core 20 and the inner wall of the coupling element 21 surrounding the spring retaining core 20. The spring element 18 is thus connected with its distal end to the coupling member 19.The coupling member 19 is axially slidably supported in the knob shaft 14 and has an outer contour forming a stopper with an inner wall contour of the knob shaft 14 for preventing the coupling member 19 from rotating in the inner space of the knob shaft 14. For this purpose, the outer contour of the coupling element 21 can be polygonal, for example. The inner wall of the knob shaft 14 has a corresponding polygonal cross section in the portion in which the coupling member 19 is received.The proximal end section 26 of the spring element opposite the coupling member 19 has, with at least one turn at the trailing end, preferably a wrap in the range from 360° to 720° (1 to 2 times wrap), and particularly preferably from approximately 500° to 700°, a diameter which is reduced in comparison with the adjoining section and through which the proximal end section 26 reaches the intermediate space of the helical turns of the worm shaft 11 and thus engages with the web-shaped threads of the worm shaft 11.The proximal end section 26 of the spring element 18 can thus be guided in the intermediate space of the helical winding of the worm shaft 8 in order to tension or tension the spring element 18 during a rotation of the worm shaft 8 and thus to move the coupling member 19 axially back and forth along the longitudinal axis of the knob shaft 14. By coupling the proximal end section 26 of the spring element 18 to the worm shaft 11, a tensioning or relaxation of the spring element 10 is effected and the coupling member 19 at the distal end of the spring element 10 is moved into the direction of the interior of the knob shaft 14 or is moved out of the front-side opening of the knob shaft 14 for coupling into the locking bit 4 a.In the disengaged state shown, the coupling member 19 is largely accommodated in the interior of the knob shaft 14 and is spaced apart from a coupling contour 22 of the closure element 4.The engaged state is reached at the latest when the coupling member 19 protrudes as far as possible from the front side of the knob shaft 14 and is connected in a positive-locking manner to the coupling contour 22 of the closure element 4, for example of the locking bit 4 a.In the uncoupled state, the proximal end section 26 of the spring element 19 is free-wheeling and is not in engagement with the screw shaft 11.FIG. 2 shows a side detail view of the locking cylinder 2 from FIG. 1 in the region of the coupling device 8.In the exemplary embodiment shown, the coupling member 19 is embodied in multiple parts in order to facilitate assembly. It has the polygonal coupling element 21 with a receiving opening 23, in which the spring retaining core 20 is accommodated. The connection between the spring retaining core 20 and the coupling element 21 can be effected by means of an interference fit. However, a cohesive connection, for example by welding, or a positive and optionally non-positive connection by screwing, bolting or riveting is also conceivable. It is also conceivable, however, for the coupling element 21 to be embodied in one piece with the spring retaining core 20.The distal end section 24 of the spring element wraps around a support section 25 protruding into the receiving opening 23 of the coupling element 21 toward the electric motor 9 with at least one wrap, preferably with more than two wraps, i.e. with a wrap angle of more than 720°. The distal end 24 is clamped onto the support section 25 in a force-fit manner and is accommodated in a form-fit manner in the intermediate space between the support section 25 and the inner wall of the coupling element 21 delimiting the receiving opening 23.In the uncoupled state shown, the proximal end 26 of the spring element 18 opposite the coupling member 19 is free-wheeling without engaging with the helical winding of the worm shaft 11. The diameter-reduced proximal end section 26 is positioned between the beginning of the helical winding of the worm shaft 11 and the end wall of the electric motor 9.It can be seen that the diameter of the section of the spring element 18 which adjoins the proximal end section 26 and runs as far as the distal end section 24 is greater than the outer diameter of the helical winding of the worm shaft 11. The spring element 18 thus engages positively with the helical winding of the worm shaft 11 only in the region of the proximal end section 26.FIG. 3 shows a side sectional view of a locking cylinder 2 with a prestressed spring element 18.The coupling contour of the coupling member 19 is not yet aligned with an exact fit with the corresponding coupling contour 22 of the closure element 4. The coupling member 19 is therefore not yet axially displaced to such an extent that it engages with the closure element 4. However, the spring element 18 is already prestressed in that the proximal end section 26 has been moved away from the electric motor 9 and toward the coupling member 19 by rotation of the worm shaft 11. For this purpose, the wraps of the spring element 18 positioned between the thread flanks of the helical winding are moved axially.FIG. 4 shows a side cut-out view of the locking cylinder 2 from FIG. 3 in the region of the coupling device 8 in the prestressed state.In the end position shown, the worm shaft 11 is again free-wheeling, in that the proximal end section 26 again now comes out of engagement of the thread flanks of this helical winding at the end of the helical winding and is arranged between the end of the helical winding and the coupling member 19 on a tubular end section of the worm shaft 11.FIG. 5 shows a side sectional view of a locking cylinder 2 in the coupled-in state. The coupling contour of the coupling member 19 is now aligned with one another by relative rotational movement of the knob shafts 6, 14 such that it is adapted to the corresponding coupling contour 22 of the closure element 4. As a result, the polygonal coupling member 19 can enter a correspondingly polygonal recess in the locking bit 4a. A positive connection is thus effected between the coupling member 19 and the closure element 4.In the two coupled-in and coupled-out end positions, which are shown in FIGS. 1 and 5, the spring element 18 is no longer in engagement with the worm shaft 11. A defined pressing force of the spring element 18 is thus ensured. In addition, the power consumption at idle is reduced. Overloading of the spring element 18 is prevented. The temperature compensation can be simplified by the end positions. At lower temperatures, the guidance is more difficult, so that the electric motor 9 has to be operated for a longer time than at higher temperatures. The running time of the electric motor 9 no longer has to be adjusted-or not so accurately-by the freewheel in the end positions.It can also be seen that on the side of the knob shaft 14 facing away from the coupling device 8, a bore protection element 27 is arranged in the interior of the knob shaft 14. The anti-drill element 27 separates the non-secure side, which is directed toward the actuating knob 15, from the non-secure side, which is situated behind the anti-drill element 27 when viewed from the actuating knob 15, of the lock cylinder 2, on which the coupling device 8 is situated.For adapting the length of the lock cylinder 2 to a respective door leaf thickness, the cylinder housing 3 can optionally be extended by extension disks which are screwed onto the end side adjacent to the actuating knob 7, 15. For this purpose, the cylinder housing 3 has threaded bores 28 a, 28 bfor receiving fastening screws for the extension disks on the end face.The operation knob 15 can be fixed at a plurality of positions on the knob shaft 14. For this purpose, detent grooves 29 are provided on the knob shaft 14 in the predetermined detent positions.FIG. 6 shows a side detail view of the locking cylinder 2 from FIG. 5 in the region of the coupling device 8.It can be seen that the coupling member 19 has now moved away from the electric motor 9 into the recess in the closure element 4 by the spring pressure force of the spring element 18. The worm shaft 11 is furthermore free-wheeling in that the proximal end section 26 of the spring element 18 is not in engagement with the helical winding of the worm shaft 11.FIG. 7 shows a front view of the polygonal coupling element 21 with the section line B-B.The coupling element 21 has a central receiving opening 23, into which the spring retaining core 20 is installed. The outer periphery has a polygonal contour with, for example, three protruding elevations 30, Additional depressions 32 can optionally be present at the intermediate regions 31 of reduced diameter.FIG. 8 shows a sectional side view of the coupling member 19 with spring retaining core 20 and coupling element 21 and spring element 18 connected in a force-fitting manner to a bearing section 25 of the spring retaining core 20 in section B-B.It can be seen that the diameter of the spring element 18 in the proximal end region 26 is significantly reduced over more than one wrap, i.e. more than 360°. In the exemplary embodiment shown, the proximal end region 26 extends over approximately 400° to 540°, i.e. a more than a single to 1.5 fold wrap.It is further clear that the distal end section 24 is connected in a force-fit manner to the support section 25 of the spring holding core 20 by more than two turns. The distal end portion 24 may also abut one of an end wall of the spring retainer core 20.The spring retaining core 20 is accommodated in the receiving opening 23 and pressed together with the coupling element 21. However, it is also conceivable for the coupling element 21 to have an internal thread and the spring retaining core 20 to have a corresponding external thread and for the spring retaining core 20 to be screwed into the coupling element 21. Other types of fastening of the spring retaining core 20 to the coupling element 21 are likewise conceivable.FIG. 9 shows a side view of the coupling member 19 from FIG. 8 with the spring element 18 installed.The polygonal outer contour of the coupling element 21 can be seen.FIG. 10 shows a side view of another embodiment of a coupling member 19 with spring element 18 connected thereto and a section line C-C.This embodiment is suitable for an electric locking unit 1, which is used, for example, without a rotatable knob shaft 6, 14 by linear displacement of a pressure element 4 b, which at least forms the locking element 4, in a fitting, for example in a furniture lock. The coupling member 19 can be used directly as a lock bolt and thereby form the closure element 4.The pressure element 4 bhas protruding noses 33, which are received in a guide opening in order to mount the pressure element 4 bto be linearly displaceable and rotationally fixed. The spring element 18 is accommodated in a receiving opening 23 of the pressure element 4 b.Deformation regions 34 are present on the pressure element 4 b, which by deformation provide a positive connection of the spring element 18 to the pressure element 4 b.FIG. 11 shows a side sectional view of the coupling member 19 from FIG. 10 in section C-C with the deformation regions 34 lying opposite one another. The deformation regions 34 have a blind hole 35, the edge regions of which can be caulked by force action to the inner distal end section 24 of the spring element 18. For this purpose, a punch is inserted into the blind holes 35 which deforms the inner wall 36 of the coupling element 19 adjoining the distal end section 24.This type of fastening of the spring element 18 to the coupling member 19 can also be used in a corresponding manner in the first exemplary embodiment. Thus, the polygonal coupling member 19 can have blind holes 35 on the outer periphery, which holes fasten the distal end section 24 to the coupling member 19 by deforming the inner walls 36 delimiting the blind holes 35.FIG. 12 shows a side detail view of the coupling member 19 from FIG. 11 in the region of a deformation region 34 with a spring element 18 positively connected there.It can be seen that the inner wall 36 of the blind hole 35 is deformed into the receiving opening 23 of the coupling member 19 in order to compress the outer diameter of the windings of the spring element 18 at the distal end section 24 and in this way to receive the distal end section 24 in the interior of the coupling member 19 in a form-fitting and frictional manner.In order to allow simplified assembly and not to restrict the mobility of the main section of the spring element 18 adjoining the distal end section 24, the diameter of the receiving opening 23 can be widened conically in front of the section with the deformation regions 34.The distal end section 24 of the spring element 18 can abut against the end wall 37 in the interior of the coupling member 19.FIG. 13 shows a perspective view of a cylindrical coupling member 19 with a pair of cuboidal projections 38 on the outer periphery of the cylindrical base body.The coupling member 19 has a central receiving opening 23, in which the spring element 18 is installed. At the outer periphery, at least one deformation region 34 with a depression 39 is present. A blind hole 35 in the depression 39 can be deformed into the interior of the coupling member 19 in order to fix the distal end 24 of the spring element 18 to the coupling member 19 in a positive-locking manner.The cuboid projections 38 protruding in opposite directions from the outer circumference of the cylindrical base body can, when correctly oriented, enter correspondingly contoured receiving openings of a coupling contour 22 in order to couple the coupling member 19 to the knob shaft 6. A positive connection is thus formed between the knob shaft 6 and the coupling member 19. Owing to the symmetrical arrangement of the projections 38, the coupling can take place in two relative angular positions of the knob shaft 6 and the coupling member 19 rotated by 180° with respect to one another.FIG. 14 shows a front view of the cylindrical coupling member 19 from FIG. 13.It can be seen that a pair of cuboidal projections 38 project in mutually opposite directions from the cylindrical outer contour of the main body. The protrusions 38 may have chamfered edges and a slightly curved radial outer surface.FIG. 15 shows a side view of the coupling member 19 from FIG. 13 with the coupling member 19 and with a spring element 18 connected in a form-fitting manner via a deformation of a blind hole 35 in a depression 39 of a deformation region 34.FIG. 16 shows a side sectional view of the coupling member 19 from FIG. 15, it can be seen that a depression 39 with a blind hole 35 in a deformation region 34 is present on opposite sides in each case. The blind hole 35 is deformed into the receiving opening 23, i.e. into the interior of the coupling member 19, wherein a projecting nose engages with the distal end section 24 of the spring element 18. As a result, the spring element 18 is connected to the coupling member 19 in a positive-locking and optionally also non-positive-locking manner.FIG. 17 shows a side cut-out view of the coupling member 19 from FIG. 16 in the region of a deformation region with a spring element 18 connected there in a form-fitting manner. The nose formed in the deformation region 34 can be clearly seen, which rests on the outer periphery of a spring winding and which, for example, positively fixes two spring windings 24 between the end wall 37 and the nose or the deformation region 34.List of reference characters1 Electrical closing unit 2 Locking cylinder 3 Cylinder housing 4 Closing element 4 a Schließ 4 bPressing element 5 Finger 6 Knob shaft 7 Actuating knob 8 Coupling device 9 Electric motor 10 Shaft 11 Worm shaft 12 Control electronics 13 Radio signal receiver 14 Knob shaft 15 Actuating knob 16 a, 16 b Sicherungs screw 17 a, 17 b Umlaufende groove 18 Spring element 19 Coupling member 20 Spring retaining core 21 Coupling element 22 Coupling contour 23 Receiving opening 24 Distal end section 25 Support section 26 Proximal end section 27 Bore protection element 28 Threaded bore 29 Latching groove 30 Elevations 31 Intermediate region 32 Depression 33 Lugs 34 Deformation region 35 Blind hole 36 Inner wall 37 End wall 38 Cuboidal projection 39 DepressionReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedEP 1 576 246 B1

[0002] EP 1 522 658 B1

[0003] WO 98 / 15703 A1

[0004] EP 2 927 395 A1

[0005] DE 10 2019,113 666 B4

[0006]

Claims

Electrical closing unit (1) having a coupling device (8), wherein the coupling device (8) has an electric motor (9) having a worm shaft (11) with a helical winding, a spring element (18) and a coupling member (19), wherein the coupling member (19) is mounted so as to be axially displaceable in the direction of extent of the worm shaft (11) and has a contour designed for mechanical coupling to a closure element (4), and wherein the spring element (18) is connected to the coupling member (19) by a distal end section (24) and is coupled to the worm shaft (11) of the electric motor (9) so as to be axially displaceable by the opposite proximal end section (26) in order to convert a rotation of the worm shaft (11) into a linear movement of the proximal end section (26) of the spring element (18), wherein the worm shaft (11) is free-wheeling, when, in the case of the spring element (18) compressed or extended into a pre-tensioning position, one of the two end positions of the lock cylinder (2) is reached in the coupled-in or decoupled state, characterized in that the proximal end section (26) of the spring element (18) has a diameter reduced over more than one wrap of the worm shaft (11) in such a way that the spring element (18) can engage with this at least one wrap of the worm shaft (11).Electrical closing unit (1) according to Claim 1, characterized in that the coupling member (19) has a polygonal outer contour.Electrical closing unit (1) according to Claim 1, characterized in that the coupling member (19) has a cylindrical outer contour, wherein a cuboidal projection is arranged on the outer circumference.Electrical closing unit (1) according to claim 3, characterised in that a pair of cuboidal projections on the outer periphery of the cylindrical outer contour of the coupling member (19) protrudes from the outer periphery in opposite directions from one another.Electrical closing unit (1) according to one of Claims 1 to 4, characterized in that the coupling member (19) has a spring retaining core (20) and a coupling element (21), wherein the coupling element (21) has a receiving opening (23) for receiving a spring retaining core (20) which is installed in the receiving opening (23) in a rotationally fixed manner, and wherein the spring retaining core (20) has a support section (25) which projects towards the worm shaft (11), and the distal end section (24) of the spring element (18) wraps around the support section (25) with at least two wraps and is connected in a force-fitting manner to the support section (25).Electrical closing unit (1) according to one of Claims 1 to 4, characterized in that the coupling member (19) has a receiving opening (23) for receiving the distal end section (24) of the spring element (18), which opening bears against a tube wall delimiting the receiving opening (23), wherein the coupling member (19) has at least one deformation region (34), at which the tube wall is deformed with a deformation section into the interior of the coupling member (19), and the distal end section (24) of the spring element (18), which deformation section is received in the receiving opening (23), is connected in a positive-locking manner to the coupling member (19) by means of the deformation section projecting into the interior of the coupling member (19).Electrical closing unit (1) according to Claim 6, characterized in that the distal end section (24) of the spring element (18) bears against the end face (37) delimiting the receiving opening (23), and at least two wraps of the distal end section (24) of the spring element (18) are arranged between the end face (37) and the deformation section.Electrical closing unit (1) according to one of the preceding claims, characterized in that the spring element (18) is a compression spring.Electrical locking unit (1) according to one of the preceding claims, characterized in that the electrical locking unit (1) is designed as a locking cylinder (2) having a cylinder housing (3), a locking bit (4) rotatably mounted in the cylinder housing (3) and a knob shaft (14) rotatably mounted in the cylinder housing (3), wherein the coupling device (8) is formed in the knob shaft (14) for mechanically coupling the knob shaft (14) to the locking bit (4), and wherein control electronics (12) for electronically coupling the knob shaft (14) and the locking bit (4) in and out are connected to the coupling device (8).Electrical closing unit (1) in the form of a lock cylinder (2) having a cylinder housing (3), a lock bit (4) rotatably mounted in the cylinder housing (3), having a knob shaft (14) rotatably mounted in the cylinder housing (3), and having a coupling device (8), wherein the coupling device (8) is arranged in the knob shaft (14) and is designed for mechanically coupling the knob shaft (14) to the lock bit (4) and has an electric motor (9) having a worm shaft (11) with a helical winding, a spring element (18) and a coupling element (19), wherein the coupling element (19) is mounted so as to be axially displaceable in the direction of extent of the worm shaft (11) and has a contour designed for mechanically coupling to a closure element (4), and wherein the spring element (18) is connected with the coupling member (19) by a distal end section (24) and is coupled with the opposite proximal end section (26) so as to be axially displaceable with the worm shaft (11) of the electric motor (9) in order to convert a rotation of the worm shaft (11) into a linear movement of the proximal end section (26) of the spring element (18), wherein the worm shaft (11) is free-wheeling when, with the spring element (18) compressed or extended into a pre-tensioning position, one of the two end positions of the lock cylinder (2) is reached in the coupled or decoupled state, characterized in that the coupling member (19) has a polygonal outer contour or a cylindrical outer contour with a cuboidal projection arranged on the outer periphery.Electrical closing unit (1) according to claim 10, characterised in that a pair of cuboidal projections on the outer periphery of the cylindrical outer contour of the coupling member (19) protrudes from the outer periphery in opposite directions from one another.Electric closing unit (1) according to one of the preceding claims, characterized in that a drilling protection element (27) is arranged in the knob shaft (14) on the side of the electric motor (9) opposite the shaft (10).Electrical closing unit (1) according to one of the preceding claims, characterized byan activation electronics (12) which is connected to the electric motor (9) and is configured for the electronic coupling and decoupling of the coupling element (19).

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