Transfer case for driving two driven wheels according to direction of rotation and air outflow device with transfer case

Abstract

According to the invention, the drive wheel (2) of the transfer case (1) is provided with a nut thread and screwed on a screw thread (4) of the threaded shaft (3) such that the drive wheel (2) moves axially depending on the direction of rotation when the threaded shaft (3) is rotationally driven and thereby engages with the first driven wheel (6) in a first direction of rotation (I), and the drive wheel (2) is driven by the first driven wheel (6) in a second direction of rotation (I). And in a second, opposite direction of rotation (II), meshing with a second driven wheel (7) of the transfer case (1).

Description

Technical Field

[0001] The invention relates to a transfer case for driving two driven wheels depending on the direction of rotation, the transfer case having the features of the preamble of claim 1 or of the parallel claim 2, and an air vent having a transfer case, the air vent having the features of the preamble of claim 10. The transfer case has one or two drive wheels and a first and a second driven wheel, wherein in the case of a rotational drive in a first direction of rotation the first driven wheel is rotationally driven and in the case of a rotational drive in an opposite second direction of rotation the second driven wheel is rotationally driven. Background Art

[0002] International patent application WO 2020 / 172098 A1 discloses a drive unit with an electric motor and a gear transfer case, by means of which two driven wheels can be driven to rotate using the electric motor depending on the direction of rotation. The gear transfer case has a drive wheel, which is located on the motor shaft of the electric motor in a rotationally fixed manner; two driven wheels, which are at the same radial distance from the motor shaft and are offset from each other in the circumferential direction of the motor shaft; and two coaxial and mutually rotationally fixed intermediate wheels, wherein the larger intermediate wheel is always meshed with the drive wheel and the smaller intermediate wheel is selectively meshed with one of the two driven wheels. The two intermediate wheels are rotatably mounted on an intermediate wheel carrier, which can pivot about the motor shaft of the electric motor, wherein a brake transfers a torque from the motor shaft to the intermediate wheel carrier. Therefore, when the motor shaft rotates in a first rotational direction, the intermediate wheel carrier pivots so that the smaller intermediate wheel meshes with one of the two driven wheels. In the case of an opposite direction of rotation of the motor shaft, the intermediate wheel carrier pivots in the opposite direction until the smaller intermediate wheel meshes with the other driven wheel. Thus, when the motor shaft of the electric motor rotates in a first direction of rotation, one of the driven wheels is driven, and when the motor shaft rotates in a second, opposite direction of rotation, the other driven wheel is driven in the opposite direction of rotation. Summary of the invention

[0003] The object of the present invention is to provide a transfer case of different designs which drives one of two driven wheels in rotation, depending on the direction of rotation.

[0004] This object is achieved according to the invention by the features of claim 1 and the features of the dependent claim 2. Another subject matter of the invention is an air bleeder with a transfer case according to the invention, which has the features of claim 10 .

[0005] In a first embodiment of the present invention, the transfer case according to the present invention has a drive wheel, a first driven wheel and a second driven wheel. When the drive wheel rotates in a first rotational direction, the drive wheel enters into a drive connection with the first driven wheel, so that the drive wheel rotationally drives the first driven wheel. "Drive connection" means in particular that in the case of a gear transmission mechanism, the drive wheel meshes with the first or second driven wheel; and in the case of a friction wheel transmission mechanism, the drive wheel rolls on the first or second driven wheel or rolls at the first or second driven wheel. However, when the drive wheel and the first driven wheel are coaxial, other drive connection methods, such as a dog clutch, can also be used. When the drive wheel rotates in a second rotational direction opposite to the first rotational direction, the drive wheel enters into a drive connection with the second driven wheel, so that the drive wheel rotationally drives the second driven wheel.

[0006] A rotation of the drive wheel may also be understood to mean a rotation of the shaft of the drive wheel or a rotation of the shaft on which the drive wheel is arranged.

[0007] In order to bring the drive wheel into driving connection with the first or second driven wheel depending on the direction of rotation, the transfer case according to the invention has a switching device which is activated by the rotation of the drive wheel. When the drive wheel rotates in a first direction of rotation, the switching device brings the drive wheel into a driving connection with the first driven wheel; and when the drive wheel rotates in a second, opposite direction of rotation, the switching device brings the drive wheel into a driving connection with the second driven wheel. "Activation of the switching device" means a driving connection of the drive wheel with the first driven wheel depending on the direction of rotation of the drive wheel, or a driving connection with the second driven wheel via the switching device when the direction of rotation of the drive wheel is opposite.

[0008] By rotating the driving wheel in a first rotational direction, the switching device moves the driving wheel coaxially or parallel to the rotation axis of the driving wheel relative to the driven wheel in the first switching direction until the driving wheel enters into a driving connection with the first driven wheel. By rotating the driving wheel in an opposite second rotational direction, the switching device moves the driving wheel coaxially or parallel to the rotation axis of the driving wheel relative to the driven wheel in a second switching direction opposite to the first switching direction until the driving wheel enters into a driving connection with the second driven wheel.

[0009] The parallel claim 2 is directed to a variant of the transfer case according to the invention with two drive wheels, wherein, when the drive wheel rotates in a first direction of rotation, the first drive wheel enters into a driving connection with the first driven wheel, and when the drive wheel rotates in an opposite second direction of rotation, the second drive wheel enters into a driving connection with the second driven wheel. As in claim 1, in claim 2, the switching device activated by the rotation of the drive wheel also brings the first drive wheel into a driving connection with the first driven wheel when rotating in the first direction of rotation, and brings the second drive wheel into a driving connection with the second driven wheel when rotating in the second direction of rotation.

[0010] Preferably, when the drive wheel or the first drive wheel is in or engaged with the first driven wheel, the drive wheel or the second drive wheel is in or out of engagement with the second driven wheel, and vice versa. In the friction wheel transfer case, "out of engagement" means that there is no drive connection.

[0011] One advantage of the invention is that, by means of a common rotational drive of one or more drive wheels, an independent rotational drive of two driven wheels can be achieved. For example, one drive motor (e.g. an electric motor) is sufficient to drive the two driven wheels independently, wherein the transfer case automatically switches depending on the direction of rotation, i.e. establishes a drive connection with one of the two driven wheels accordingly.

[0012] The dependent claims are based on the advantageous embodiments and developments of the invention specified in claims 1 and 2 .

[0013] In one embodiment of the present invention, the switching device has a screw drive mechanism, which, for example, has a screw thread and a nut thread engaged with the screw thread. The screw thread can also be understood as an external thread, and the nut thread can also be understood as an internal thread. The rotation of the screw thread relative to the nut thread causes the nut thread to move axially relative to the screw thread. The screw thread and the nut thread preferably have a larger pitch (Steigung), that is, at least 1.0 times, preferably at least 2.0 times, and especially at least 3.0 times the core diameter of the screw thread. In particular, it involves a multi-thread thread. The rotation of one or more drive wheels of the transfer case drives the screw drive mechanism to rotate, wherein the screw drive mechanism converts the rotation into movement. When rotating in a first rotational direction, the screw drive mechanism of the switching device moves the drive wheel or the first drive wheel in a first switching direction, so that the drive wheel or the first drive wheel enters into a drive connection with the first driven wheel and drives the first driven wheel to rotate. When the reverse rotation is performed along the second rotation direction, the screw drive mechanism moves the drive wheel or the second drive wheel along the second switching direction, so that the drive wheel or the second drive wheel enters into driving connection with the second driven wheel and drives the second driven wheel to rotate.

[0014] The invention does not exclude the possibility that both elements of the screw drive rotate, i.e., in the present example, both the screw thread and the nut thread can rotate. In an embodiment of the invention, during switching, i.e., when the drive wheel or the first drive wheel moves in the first switching direction, or when the drive wheel or the second drive wheel moves in the second switching direction, the screw drive rotates relative to the nut thread, wherein it is not excluded that the nut thread rotates with the screw thread at a different, in particular lower, speed. If the drive wheel or the first drive wheel is in a drive connection with the first driven wheel, or the drive wheel or the second drive wheel is in a drive connection with the second driven wheel, the screw thread and the nut thread preferably rotate together. Then, in particular, a rotation of the screw thread relative to the nut thread will no longer occur subsequently.

[0015] An improved solution of the above-mentioned embodiment of the present invention provides a screw transmission mechanism with a threaded shaft, that is, a shaft with a screw thread. Here, the threaded shaft is especially an input shaft or a drive shaft of the transfer case according to the present invention, that is, the threaded shaft is driven to rotate in order to drive one or more drive wheels in rotation. One or more drive wheels have a nut thread, and the one or more drive wheels are screwed onto the thread of the threaded shaft with the nut thread. The rotation of the threaded shaft relative to the one or more drive wheels in a first rotation direction causes the one or more drive wheels to move in a first switching direction, thereby causing the drive wheel or the first drive wheel to enter into a drive connection with the first driven wheel. The reverse rotation of the threaded shaft relative to the one or more drive wheels in a second rotation direction causes the one or more drive wheels to move in a second switching direction, thereby causing the drive wheel or the second drive wheel to enter into a drive connection with the second driven wheel.

[0016] Preferably, the switching device or, in general, the transfer case has an axial travel limiter for one or more drive wheels, which limits the movement of the one or more drive wheels on the threaded shaft in two switching directions, so that when the drive wheel or the first or second drive wheel is in drive connection with the first or second driven wheel, the movement of the one or more drive wheels in the switching direction is terminated. Further rotational drive of the threaded shaft drives the one or more drive wheels to rotate with the threaded shaft, thereby rotationally driving the first driven wheel in the first rotational direction via the drive connection and rotationally driving the second driven wheel in the second rotational direction.

[0017] The movement of one or more drive wheels in one of the two switching directions can be caused, for example, when the transfer case is started (i.e., when the rotary drive begins) by the inertia of one or more drive wheels, which initially do not rotate with the threaded shaft, for example, or initially rotate slower than the threaded shaft. In order to ensure the start of the switching device, i.e., the movement of one or more drive wheels in the switching direction, one embodiment of the invention provides a friction brake for the one or more drive wheels, which brakes the one or more drive wheels. This ensures, for example, the rotation of the threaded shaft relative to the one or more drive wheels (the drive wheels are screwed onto the threaded shaft with their nut threads) and the movement of the one or more drive wheels in the switching direction until the one or more drive wheels are in drive connection with one of the driven wheels. If the one or more drive wheels are in drive connection with one of the driven wheels, the friction brake will fail.

[0018] In order to prevent the driven wheel from accidentally rotating when it is not in driving connection with the drive wheel, one arrangement of the invention provides a locking element which, when one or more drive wheels rotate in a first rotational direction, is moved into a first locking position in which the locking element locks the second driven wheel against rotation. A reverse rotation of one or more drive wheels in a second rotational direction moves the locking element or the second locking element into a second locking position in which the locking element locks the first driven wheel against rotation.

[0019] In a refinement of the invention, the switching unit or one or more drive wheels moves a locking element or multiple locking elements into the locking position. The transfer case according to the invention can have a common locking element for both driven wheels or can have a separate locking element for each driven wheel.

[0020] The transfer case according to the present invention can have friction wheels as driving wheels and driven wheels, wherein the drivingly connected wheels overlap or roll close to each other, so that the driving wheel rotationally drives the drivingly connected driven wheels. One design of the present invention provides that the transfer case is implemented as a gear transmission mechanism with gears, which serve as driving wheels and driven wheels, wherein the driving wheel meshes with the drivingly connected driven wheels and drives them to rotate.

[0021] In particular, the transfer case according to the invention has a spur gear transmission with spur gears having mutually parallel axes of rotation. A spur gear is a gear having teeth on its circumference. Other transmission configurations are not excluded by the invention.

[0022] The air vent according to the invention having the features of claim 10 has a first movable air control element, a second movable air control element and a transfer case of the type described above, which moves the air control elements. The first driven wheel of the transfer case is in driving connection with the first air control element of the air vent, so that the first air control element is moved when the drive wheel of the transfer case rotates in a first rotational direction. The second driven wheel of the transfer case is in driving connection with the second air control element of the air vent, so that when the drive wheel of the transfer case rotates in an opposite second rotational direction, the second driven wheel, which is in driving connection with the drive wheel in this case, moves the second air control element of the air vent.

[0023] In order to enable the air control element of the air vent to move in two opposite directions when the driven wheel of the transfer case rotates in one of the respective rotational directions, the air vent can have a crank drive, a cam mechanism or a cam drive as a drive connection mechanism, or a crank drive, a cam mechanism or a cam drive in the drive connection mechanism between the driven wheel and the air control element, which converts the rotational movement of the driven wheel in one of the respective rotational directions into a reciprocating movement of the air control element. This list is exemplary and not exhaustive.

[0024] The air control element can be an air deflecting element which deflects the air flow from the air outflow. Such an air deflecting element can be pivoted in particular. One of the air control elements can also be an air quantity control element which controls the amount of air flowing through the air outflow, in particular throttling the amount of air passing through the air outflow. Such an air quantity control element is in particular a movable throttle slide or a pivotable throttle valve.

[0025] The features and feature combinations, implementation schemes and designs of the present invention mentioned above in the specification, as well as the features and feature combinations mentioned below in the description of the drawings and / or drawn in the drawings, can be used not only in the combination given or drawn accordingly, but also in any other combination in principle, or can also be used individually. An implementation scheme of the present invention that does not have all the features of a dependent claim is feasible. A single feature of a claim can also be replaced by other disclosed features or feature combinations. The following implementation scheme of the present invention is feasible, which does not have all the features of one or more embodiments, but has any part of the characteristic features of an embodiment in principle, and if necessary, combines one, more or all features of one or more other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further explained below with reference to the embodiments shown in the accompanying drawings.

[0027] Figure 1 A schematic diagram showing an embodiment of a transfer case according to the present invention is shown;

[0028] Figure 2 A schematic diagram showing a second embodiment of a transfer case according to the present invention; and

[0029] Figure 3 A schematic diagram of an air outflow device according to the present invention is shown.

[0030] In principle, identical components are provided with the same reference numbers in the figures. DETAILED DESCRIPTION

[0031] exist Figure 1 The transfer case 1 according to the invention shown in the figure has a spur gear (i.e. a gear with teeth on its circumference) as a drive wheel 2, which is arranged on a threaded shaft 3. The threaded shaft 3 has an external thread, which is referred to as a screw thread 4 here. The drive wheel 2 has an internal thread that matches the screw thread 4 of the threaded shaft 3, which is referred to as a nut thread here, and the drive wheel 2 is screwed onto the screw thread 4 of the threaded shaft 3 with the internal thread. In particular, the screw thread 4 is not shown to scale. In particular, the screw thread has a thread pitch that corresponds to three to four times the core diameter and is designed as a three-thread thread.

[0032] The threaded shaft 3 can also be understood as a drive shaft or input shaft of the transfer case 1 according to the present invention.

[0033] By rotating the threaded shaft 3 relative to the drive wheel 2 screwed thereon, the drive wheel 2 is moved axially relative to the threaded shaft 3 and relative to the axis and the rotation axis of the drive wheel 2 .

[0034] On both sides of the drive wheel 2 , the threaded shaft 3 has flanges as axial travel limiters 5 for the drive wheel 2 , which limit the axial movement of the drive wheel 2 on the threaded shaft 3 .

[0035] Furthermore, the transfer case 1 according to the present invention has a first driven wheel 6 and a second driven wheel 7, which are spur gears having teeth on their circumferences, just like the drive wheel 2. The drive wheel 2 and the two driven wheels 6, 7 have parallel axes, and the two driven wheels 6, 7 are arranged at a radial distance from the drive wheel 2, so that the teeth of the drive wheel 2 and the teeth of one of the two driven wheels 6, 7 can be brought into meshing action with each other by the axial movement of the drive wheel 2 along its axis of rotation. The meshing action of the teeth of the gears can also be simply referred to as the meshing of the gears, that is, the meshing of the drive wheel 2 with one of the two driven wheels 6, 7. When the drive wheel 2 meshes with one of the two driven wheels 6, 7, the drive wheel 2 is connected to the corresponding driven wheel 6, 7 in driving connection, that is, when rotating, the drive wheel 2 rotationally drives the corresponding driven wheel 6, 7.

[0036] In the present embodiment, the two driven wheels 6, 7 have the same diameter and are coaxially arranged. However, the following embodiments of the transfer case 1 according to the present invention are also possible, in which the driven wheels 6, 7 have different diameters and correspondingly have different radial distances from the drive wheel 2 (not shown). The driven wheels 6, 7 do not necessarily have to be arranged at the same circumferential position of the drive wheel 2, but may also be offset from each other in the circumferential direction of the drive wheel 2 (not shown).

[0037] The two driven wheels 6 , 7 are each arranged in a rotationally fixed manner on a respective shaft, which can be understood as an output shaft 8 of the transfer case 1 .

[0038] Driven by the rotation of the threaded shaft 3, the threaded shaft 3 first rotates in the drive wheel 2, so that the drive wheel 2 moves axially on the threaded shaft 3 until it abuts against one of the axial stroke limiters 5. Then, the drive wheel 2 rotates with the threaded shaft 3. The axial stroke limiter 5 is arranged to stop the axial movement of the drive wheel 2 when the drive wheel 2 is engaged with one of the two driven wheels 6, 7.

[0039] When the threaded shaft 3 rotates in the first rotation direction I relative to the drive wheel 2, the drive wheel 2 moves axially in the first direction until it meshes with the first driven wheel 6 and rotationally drives the first driven wheel 6. When the threaded shaft 3 rotates in the second rotation direction II opposite to the first rotation direction I relative to the drive wheel 2, the drive wheel 2 moves axially in the second direction opposite to the first direction until it meshes with the second driven wheel 7 and rotationally drives the second driven wheel 7. The switching position is Figure 1 In the figure, dashed lines indicate that in this shift position the drive wheel 2 meshes with one of the two driven wheels 6 , 7 .

[0040] The meshing of the teeth of the gears or the meshing of the drive wheel 2 with one of the driven wheels 6 , 7 can also be understood as a drive connection between the gears or a drive connection between the drive wheel 2 and one of the driven wheels 6 , 7 .

[0041] The threaded shaft 3 with the screw thread 4 and the nut thread of the drive wheel 2 constitute the switching device 9 of the transfer case 1 according to the present invention, wherein the screw thread 4 and the nut thread constitute a screw transmission mechanism 10. When the threaded shaft 3 rotates in the first rotation direction I, the switching device 9 or its screw transmission mechanism 10 causes the drive wheel 2 to move in the first direction (the first direction is referred to as the first switching direction I' herein), and the drive wheel 2 enters into a driving connection with the first driven wheel 6 through the first direction, that is, meshes with the first driven wheel 6 and drives the first driven wheel 6 to rotate. When the threaded shaft 3 rotates in the opposite second rotation direction II, the switching device 9 or its screw transmission mechanism 10 causes the drive wheel 2 to move in the second direction (the second direction is referred to as the second switching direction II' herein), and the drive wheel 2 enters into a driving connection with the second driven wheel 7 through the second direction, that is, meshes with the second driven wheel 7 and drives the second driven wheel 7 to rotate.

[0042] In the following Figure 2 The explanation mainly explains Figure 1 , and supplementarily also refers to Figure 1 The same components and elements are marked with the same reference numerals.

[0043] exist Figure 2 The transfer case 1 according to the present invention shown in has two drive wheels 11, 12, namely the first drive wheel 11 and the second drive wheel 12, both of which have internal threads or nut threads, and they are screwed on the screw thread 4 of the threaded shaft 3 of the transfer case 1 at a certain distance. By rotating the threaded shaft 3 in the first rotation direction I relative to the drive wheels 11, 12, the two drive wheels 11, 12 move axially on the threaded shaft 3 in the first switching direction I' until the first drive wheel 11 meshes with the first driven wheel 6, that is, it is in drive connection with the first driven wheel 6. When the threaded shaft 3 rotates in the opposite second rotation direction II relative to the drive wheels 11, 12, the two drive wheels 11, 12 move axially on the threaded shaft 3 in the opposite second switching direction II' until the second drive wheel 12 meshes with the second driven wheel 7, that is, it is in drive connection with the second driven wheel 7. Figure 2 The two switching positions of the drive wheels 11 , 12 are indicated by dashed lines in FIG. 2 , in which one of the drive wheels 11 , 12 meshes with the corresponding driven wheel.

[0044] The axial movement of the drive wheels 11 , 12 on the threaded shaft 3 is limited by a flange located on the threaded shaft 3 between the two drive wheels 11 , 12 and serving as an axial travel limiter 5 .

[0045] besides, Figure 2 Transfer case 1 and Figure 1 The transfer case 1 in is of the same design and functions in the same way.

[0046] exist Figure 3 The air outflow device 13 according to the invention shown in FIG. 1 has a tubular housing 14 with a rectangular cross section in the present embodiment. Two blades are arranged one behind the other in the flow direction through the housing 14 near the outflow opening 15 in the housing 14, and when viewed in the flow direction, the two blades cross each other at right angles. The blades can be pivoted about a pivot axis, which extends in the longitudinal direction of the blades and which passes transversely through the housing 14 of the air outflow device 13 in longitudinal planes of the housing 14 that are perpendicular to each other.

[0047] The air flow outlet 14 is embedded in an instrument panel, a center console or other interior decorative parts of a passenger compartment of a motor vehicle (not shown), and is arranged with its flow outlet 15 to be flush with a surface of the instrument panel on the passenger compartment side, a surface of the center console on the passenger compartment side or a surface of other interior decorative parts of the passenger compartment on the passenger compartment side, so that the air flowing out of the air flow outlet 14 through the flow outlet 15 flows into the passenger compartment of the motor vehicle (not shown).

[0048] The two blades form air deflection elements, by which the air flowing through the housing 14 of the air outflow device 13 and outflowing via the outflow opening 15 can be deflected to one side and upward and downward. In general, the two blades can be understood as pivotable or generally movable air control elements 17, 18 of the air outflow device 13; hereinafter, the two blades will be referred to as first air control element 17 and second air control element 18. The air outflow device 13 can also have a blade grid, that is, a plurality of blades arranged parallel to each other in the housing 14, which can be pivoted together in parallel via a coupling rod 16.

[0049] Instead of air control elements 17, 18, the air outlet 13 can also have a movable throttle slide or a pivotable throttle valve for throttling the air flow through the housing 14 of the air outlet 13 and, if necessary, also for blocking the housing 14 of the air outlet 13 from air flow (not shown). Such a throttle slide, throttle valve or the like can also be understood as an air quantity control element and generally also constitutes an air control element.

[0050] The air control elements 17, 18 are moved, i.e. pivoted, by means of an electric motor 19 via a transfer case 1 according to the invention, which in the present embodiment is arranged outside the housing 14 of the air vent 13. Figure 1Like the transfer case 1 in FIG. 1 , it is constructed as a gear transmission mechanism with spur gears, which serve as the drive wheel 2 and the driven wheels 6, 7. The transfer case has a drive wheel 2 with an internal thread or a nut thread, which is screwed on the external or screw thread 4 of the gear shaft 3 of the transfer case 1, wherein the nut thread of the drive wheel 2 and the screw thread 4 of the threaded shaft 3 form a screw transmission mechanism 10, which causes the drive wheel 2 to move axially on the threaded shaft 3 relative to its rotation axis when the threaded shaft 3 rotates relative to the drive wheel 2.

[0051] The flanges of the threaded shaft 3 on both sides of the drive wheel 2 form an axial stroke limiter 5 for the drive wheel 2 , which limits the axial movement of the drive wheel on the threaded shaft 3 .

[0052] The threaded shaft 3 can be rotationally driven by an electric motor 19 , wherein a reduction transmission mechanism (not shown) can be provided between the electric motor 19 and the threaded shaft 3 .

[0053] and Figure 1 The difference is that in Figure 3 In the embodiment, the two driven wheels 6 and 7 are not coaxial, but are arranged opposite to each other relative to the driving wheel 2, and - as shown in FIG. Figure 1 As in the example above, the drive wheel 2 is axially offset from each other. By the rotational drive of the threaded shaft 3 in the first rotational direction I, the drive wheel 2 is axially moved in the first switching direction I' by means of the screw transmission mechanism 10, so that the drive wheel is engaged with the first driven wheel 6 of the two driven wheels, that is, the first driven wheel 6 is driven to rotate. By the rotational drive of the threaded shaft 3 in the second rotational direction II opposite to the first rotational direction I, the drive wheel 2 is axially moved in the second switching direction II' opposite to the first switching direction I' by means of the screw transmission mechanism 10, so that the drive wheel is engaged with the second driven wheel 7 of the two driven wheels, that is, the second driven wheel 7 is driven to rotate. Figure 3 The drive wheel 2 is shown in a second shift position, in which it is moved in a second shift direction II′ and is drive-connected to the second driven wheel 7 , ie meshes with the second driven wheel 7 .

[0054] When the driving wheel 2 is engaged with the first or second driven wheel 6 , 7 (ie, drive connected), the axial stroke limiters 5 located on both sides of the driving wheel 2 stop the movement of the driving wheel 2 in the two switching directions I′, II′.

[0055] Figure 3 The transfer case 1 of the air outlet 13 in Figure 1 The transfer case 1 in the embodiment of FIG. 1 functions in substantially the same manner, with respect to Figure 3 For instructions on transfer case 1 in Figure 1 Description of transfer case 1 in.

[0056] In order to pivot the first air control element 17, the first driven wheel 6 of the transfer case 1 has an elliptical first control cam 21 on its end side facing the first air control element 17, into which a first control bolt 22 is inserted, the first control bolt protruding from the first air control element 17 at a certain distance from the pivot axis of the first air control element 17. The first control cam 21 surrounds the rotation axis of the first driven wheel 6, wherein the radial distance between the first control cam 21 and the rotation axis of the first driven wheel 6 varies on the circumference of the first driven wheel 6, so that the rotation of the first driven wheel 6 in the rotation direction causes the first air control element 17 to pivot back and forth. Therefore, it is not necessary to reverse the rotation direction of the first driven wheel 6 to pivot the first air control element 17 backward.

[0057] The second driven gear 7 of the transfer case 1 has, in addition to its circumferential toothing, a bevel toothing 23 which meshes with a crown wheel 24 , the rotation axis of which intersects the rotation axis of the second driven gear 7 at a right angle.

[0058] Like the first driven wheel 6, the disc gear 24 has an elliptical second control cam 25 on its end side facing the second air control element 18, into which a second control pin 26 is inserted, and the second control pin protrudes from the second air control element 18 at a certain distance from the pivot axis of the second air control element 18. The second control cam 25 surrounds the rotation axis of the disc gear 24, wherein the radial distance between the second control cam 25 and the rotation axis of the disc gear 24 changes on the circumference of the disc gear 24, so that the rotation of the disc gear 24 in the rotation direction causes the second air control element 18 to pivot back and forth.

[0059] The transfer case 1 distributes the—in the present exemplary embodiment, rotary—drive movement of the electric motor 19 to the two air control elements 17 , 18 of the air bleeder 13 , so that the two air control elements 17 , 18 can be pivoted independently of one another into any desired position by the one electric motor 19 .

[0060] In this case, the screw drive 10 constituting the switching device 9 or being part of the switching device 9, when rotating in a first rotational direction I, brings the first driven wheel 6 into drive connection with the drive wheel 2, depending on the rotational direction, so that the first air control element 17 is pivoted in the first rotational direction I. In the case of an opposite second rotational direction II, the screw drive 10 or the switching device 9 brings the second driven wheel 7 into drive connection with the drive wheel 2, so that the second air control element 18 of the air outlet 13 is pivoted in the second rotational direction II. The switching device 9 switches to the first or second switching direction I', II', depending on the rotational direction of the electric motor 19 or the threaded shaft 3. For a better overview, in Figure 3 The directions of rotation I, II and the second switching direction II′ are not shown.

[0061] In order to prevent the air control elements 17, 18 from accidentally moving when the corresponding assigned driven wheels 6, 7 are not drivingly connected to the drive wheel 2, the transfer case 1 has a locking element 27 for each driven wheel 6, 7, which is arranged on the circumference of the corresponding driven wheel 6, 7 and can be moved parallel to the rotation axis of the corresponding driven wheel 6, 7. Figure 3 In the embodiment, the locking element 27 is located behind the axial plane passing through the rotation axis of the driving wheel 2 and the driven wheels 6, 7, and is therefore partially covered by the driving wheel 2 and the driven wheels 6, 7. The locking element 27 has a locking tooth 28, which can be engaged between two teeth of the toothing of the driven wheels 6, 7 by moving the locking element 27 and can be disengaged from the toothing of the driven wheels 6, 7.

[0062] A fork 29 extends from the locking element 27 in the direction of the drive wheel 2, and the fork overlaps the drive wheel 2 at both end sides, so that when the drive wheel 2 moves in the first switching direction I', one of the locking elements 27 is moved, so that the locking tooth 28 of the one locking element 27 engages between two teeth of the toothing of the second driven wheel 7 or, in the present embodiment, between two teeth of the conical toothing 23 of the second driven wheel 7, and locks the second driven wheel 7 to prevent it from rotating. When the drive wheel 2 moves in the opposite second switching direction II', the drive wheel 2 moves the other locking element 27 via the fork 29 of the other locking element 27, so that its locking tooth 28 reaches between two teeth of the toothing of the first driven wheel 6, and locks the first driven wheel 6 to prevent it from rotating. Figure 3 The drive wheel 2 is shown in a second shift position, in which it meshes with the second driven wheel 7 and in which a further locking element 27 locks the first driven wheel 6 against rotation.

[0063] The fork 29 of the locking element 27 is narrower than the width of the drive wheel 2, so that the fork 29 acts as a friction brake 30 for the drive wheel 2. The friction brake 30 ensures that the drive wheel 2 does not rotate with the threaded shaft 3 or at least rotates slower than the threaded shaft 3 when the drive wheel 2 does not rest against one of the axial travel limiters 5. This ensures an axial movement of the drive wheel 2 in one or the other switching direction I', II'.

[0064] The braking force of the friction brake 30 is small, so that the air control elements 17 , 18 can be easily pivoted by the electric motor 19 through the transfer case 1 .

[0065] The invention does not exclude other friction brakes than the fork 29, and it may also be a friction brake that is effective only in the neutral position of the drive wheel 2, in which the drive wheel 2 is not engaged with either of the two driven wheels 6, 7 (not shown); an embodiment of the invention without a friction brake is also feasible.

[0066] List of reference symbols:

[0067] I, II Rotation direction

[0068] I', II' switch direction

[0069] 1 Transfer case

[0070] 2 driving wheels

[0071] 3 threaded shaft

[0072] 4 screw threads

[0073] 5Axial stroke limiter

[0074] 6First driven wheel

[0075] 7 Second driven wheel

[0076] 8 driven shaft

[0077] 9 Switching device

[0078] 10 Screw drive mechanism

[0079] 11 First drive wheel

[0080] 12 Second driving wheel

[0081] 13 Air vent

[0082] 14 Shell

[0083] 15 Outlet

[0084] 16 Connecting rod

[0085] 17First air control element

[0086] 18 Second air control element

[0087] 19 Electric Motor

[0088] 20 Unassigned

[0089] 21 First control cam

[0090] 22 First control bolt

[0091] 23 conical teeth

[0092] 24 disc gear

[0093] 25 Second control cam

[0094] 26 Second control bolt

[0095] 27 Locking element

[0096] 28 locking teeth

[0097] 29 Fork

[0098] 30 Friction brakes.

Claims

1. A transfer case (1), comprising: a drive wheel (2); a first driven wheel (6), which is rotationally driven by the drive wheel (2) when rotating in a first rotation direction (I); a second driven wheel (7), which is rotationally driven by the drive wheel (2) when rotating in a second rotation direction (II) opposite to the first rotation direction (I); and a switching device (9) depending on the rotation direction, so that by rotating the drive wheel (2) in the first rotation direction (I), the first driven wheel (6) can enter into a driving connection with the drive wheel (2), and by rotating the drive wheel (2) in the second rotation direction (II) opposite to the first rotation direction (I), the second driven wheel (7) can enter into a driving connection with the drive wheel (2), characterized in that When the driving wheel (2) rotates along a first rotation direction (I), the switching device (9) causes the driving wheel (2) to move coaxially or parallel to the rotation axis of the driving wheel (2) relative to the first driven wheel (6) along a first switching direction (I'), thereby causing the first driven wheel (6) to be drivingly connected to the driving wheel (2); and when the driving wheel (2) rotates along a second rotation direction (II), the switching device (9) causes the driving wheel (2) to move coaxially or parallel to the rotation axis of the driving wheel (2) relative to the second driven wheel (7) along a second switching direction (II') opposite to the first switching direction (I'), thereby causing the second driven wheel (7) to be drivingly connected to the driving wheel (2).

2. A transfer case (1), comprising: a first drive wheel (11); and a first driven wheel (6), wherein when rotating in a first rotation direction (I), the first driven wheel is rotationally driven by the first drive wheel (11); A second driving wheel (12); and a second driven wheel (7), wherein when the second driven wheel rotates in a second rotation direction (II) opposite to the first rotation direction (I), the second driven wheel is rotationally driven by the second driving wheel (12); and a switching device (9) depending on the rotation direction, wherein in the case of a first rotation direction (I), the switching device causes the first driven wheel (6) to enter into a driving connection with the first drive wheel (11), and in the case of a second rotation direction (II), the switching device causes the second driven wheel (7) to enter into a driving connection with the second drive wheel (12), characterized in that when rotating along the first rotation direction (I), the switching device (9) causes the first drive wheel (11) to move coaxially or parallel to the rotation axis of the first drive wheel (11) relative to the first driven wheel (6) along a first switching direction (I'), thereby causing the first driven wheel (6) to be drivingly connected to the first drive wheel (11), and in the case of the second rotation direction (II), the switching device (9) causes the second drive wheel (11) to move coaxially or parallel to the rotation axis of the second drive wheel (12) relative to the second driven wheel (7) along a second switching direction (II') opposite to the first switching direction (I'), thereby causing the second driven wheel (7) to be drivingly connected to the second drive wheel (12).

3. The transfer case (1) according to claim 1 or 2, characterized in that: The switching device (9) has a screw transmission mechanism (10), which is driven to rotate when the one or more drive wheels (2; 11, 12) of the transfer case (1) rotates, and when rotating in a first rotation direction (I), the screw transmission mechanism causes the drive wheel (2) or the first drive wheel (11) to move relative to the first driven wheel (6) in a first switching direction (I'), and when rotating in a second rotation direction (II), the screw transmission mechanism causes the drive wheel (2) or the second drive wheel (12) to move relative to the second driven wheel (7) in a second switching direction (II').

4. The transfer case (1) according to claim 3, characterized in that: The screw transmission mechanism (10) comprises a threaded shaft (3) and the one or more drive wheels (2) or the multiple drive wheels (11, 12), and a nut thread, wherein the nut thread is screwed onto the threaded shaft (3), so that when the threaded shaft (3) rotates along a first rotation direction (I), the one or more drive wheels (2; 11, 12) move along a first switching direction (I'), and when the threaded shaft (3) rotates along a second rotation direction (II), the one or more drive wheels (2) or the multiple drive wheels (11, 12) move along a second switching direction (II'); and the switching device (9) comprises an axial stroke limiter (5) for the one or more drive wheels (11, 12), and when the one or more drive wheels (11, 12) are connected to the first driven wheel (6) or the second driven wheel (7) by driving, the axial stroke limiter terminates the movement in the two switching directions (I', II').

5. The transfer case (1) according to claim 3 or 4, characterized in that: The transfer case (1) has a friction brake (30) for the one or more drive wheels (2; 11, 12), which brakes the one or more drive wheels (2; 11, 12) at least until the one or more drive wheels (2; 11, 12) are in driving connection with the first or second driven wheel (6, 7).

6. A transfer case (1) according to any one or more of the preceding claims, characterised in that The transfer case (1) has a locking element (27) for the driven wheels (6, 7), which is moved by the transfer case (1) into a first locking position when the one or more drive wheels (2; 11, 12) rotate in a first rotational direction (I), in which the locking element (27) locks the second driven wheel (7) and prevents it from rotating; And when rotating in the second rotation direction (II), the locking element is moved by the transfer case (1) into a second locking position, in which the locking element (27) locks the first driven wheel (6) to prevent it from rotating.

7. The transfer case (1) according to claim 6, characterized in that: The switching device (9) or the one or more drive wheels (2; 11, 12) moves the locking element (27) into a locking position.

8. A transfer case (1) according to any one or more of the preceding claims, characterised in that The transfer case (1) has a gear transmission mechanism.

9. A transfer case (1) according to any one or more of the preceding claims, characterised in that The transfer case (1) has a spur gear transmission mechanism with parallel rotation axes.

10. An air outflow device (13) having a movable first air control element (17) and a movable second air control element (18), characterized in that: The air outflow device (13) has a transfer case (1) according to any one or more of the preceding claims; and a movable first air control element (17) is drivingly connected to the first driven wheel (6), and a second air control element (18) is drivingly connected to the second driven wheel (7), so that when the first driven wheel (6) rotates, the first driven wheel (6) moves the first air control element (17), and when the second driven wheel (7) rotates, the second driven wheel (7) moves the movable second air control element (18).

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