Eco 4x4 - Front axle gearbox with integrated shut-off unit for all-wheel drive

Abstract

Axle drive (1), comprising a drive gear (2), a gearbox housing (3), a differential basket (4) rotatably mounted in the gearbox housing (3) by means of a first and a second differential basket bearing (5a / b), wherein these bearings (5a / b) are spaced apart from each other in an axial direction (A), a differential gear (6), a first and a second output shaft (7a / b) and at least one switchable torque transmission device (8) arranged between the drive gear (2) and the first output shaft (7a) and having a torque transmission range (8a) for interrupting a torque flow between the drive gear (2) and the first output shaft (7a), wherein the torque transmission area (8a) is at least partially arranged in the axial direction between these differential basket bearings (5a / b), wherein the torque transmission device (8) has a radially inner output part (8d) and a radially outer drive part (8c) and wherein the output part (8d) can be contacted by the drive part (8c) in the torque transmission area (8a) and a positive-locking connection can be formed between the output part (8d) and the drive part (8c) and wherein the drive part (8c) is designed as a sliding sleeve and the The output part (8d) is designed as a counterpart to and for receiving this sliding sleeve, and the drive part (8c) is mounted to be displaceable in the axial direction. characterized by the fact that the torque transmission device (8) can be transferred from its first to its second operating mode with an actuator (13), that the actuator (13) has a rotatably mounted actuator shaft (13a), that the actuator shaft (13a) and a rotation axis (9) of the torque transmission device (8) enclose an angle α of 80° to 100°, and that the drive part (8c) and the driven part (8d) each have a first and at least one further row of positive locking elements (8c.1, 8d.1) for positive locking connection with each other, and that two successive rows are spaced apart from each other by a gap in the axial direction, and that this gap is larger than the axial extent of at least one of the rows of positive locking elements (8c.1, 8d.1), and that the actuator (13) has an eccentric (13c) that is rotationally fixed to the actuator shaft (13a), and that this eccentric (13c) is configured for contacting and transferring the drive part (8c) from the first to the second end position, and that the drive part (8c) opposite the output part (8d) with a coupling bearing (12) is rotatably mounted and that the coupling bearing (12) has at least one rolling bearing.

Description

[0001] The present invention relates to an axle drive according to the preamble of claim 1 and a method for operating such an axle drive.

[0002] Such an axle drive is known from US 4,625,584 A. US 7,096,990 B2 relates to a shift axle for a vehicle with selectable four-wheel drive. US 4,271,722 A relates to a disengagement device for an axle. US 7,096,990 B2 relates to a double disengagement device for multi-axle vehicles. DE 10 2009 049 013 A1 relates to a positive-locking coupling. US 4,915,190 A relates to a control system for a shift axle mechanism in a vehicle with selectable four-wheel drive. US 6,450,915 B1 relates to a drive power transmission device for a motor vehicle with a driving mode switching mechanism.

[0003] The invention is described below in connection with a drive train for an all-wheel-drive passenger car (PC), this does not constitute a limitation of the invention to such an application.

[0004] All-wheel drive vehicles can be divided into those with permanent drive to all wheels and those with non-permanent drive. In non-permanent all-wheel drive systems, a switching actuator and sensors are present that engage or disengage the wheels that are not driven as needed. This selective driving of the wheels offers the advantage that, when these wheels are not driven, no load-dependent losses occur in the axle drives, load-independent losses are reduced, and thus increased efficiency and a reduction in CO2 emissions can be achieved.

[0005] Drivetrains for all-wheel-drive vehicles are known in the prior art, in which certain wheels are driven only selectively. US Patent 4,625,584 A deals with an axle drive device for the temporary engagement and disengagement of a drive axle of an all-wheel-drive vehicle. The torque flow in at least one output shaft, which is located between the differential and a wheel of the vehicle, can be interrupted by means of a sliding sleeve.

[0006] It is an object of the invention to provide an axle drive with improved drive train efficiency and a small footprint. This object is achieved by an object according to claim 1, and by a method for operating such an axle drive according to claim 5.

[0007] For the purposes of the invention, an axle drive is understood to be a transmission device for distributing drive power between a first wheel of a motor vehicle and a second wheel, in particular a left and a right wheel. In this sense, a wheel is understood to be a wheel-tire combination of a motor vehicle, especially a passenger car. An axle drive is understood to be, in particular, an axle differential gear device designed to enable speed differences between at least two wheels. Preferably, an axle drive is arranged between these first and second wheels of the vehicle, more preferably between the right and left wheels. The drive power can be supplied to the axle drive, in particular by means of a drive shaft, via the drive gear, and distributed by the axle drive to the wheels.

[0008] For the purposes of the invention, a drive gear is understood to be a gear for receiving drive power, particularly within the axle drive. In particular, a drive gear has external teeth. Preferably, a drive gear is designed as a spur gear, more preferably as a bevel gear, and most preferably as a ring gear. The drive gear meshes with a drive pinion, particularly for receiving the drive power. Preferably, the drive gear is mounted on a differential carrier and is preferably rotationally fixed to it; most preferably, the drive gear is rotationally fixed to the differential carrier.

[0009] For the purposes of the invention, a differential carrier is understood to be a device designed to receive the drive gear on an outer surface and to receive a differential gear on an inner surface or in a recess. Preferably, the differential carrier is designed to receive a spur gear differential and more preferably a bevel gear differential. Furthermore, the differential carrier has at least one first and one second differential carrier bearing and is rotatably mounted with it relative to a transmission housing, in particular about an axis of rotation.

[0010] Preferably, the differential carrier bearings are designed as plain bearings, more preferably as rolling bearings. The first and second differential carrier bearings are arranged axially spaced apart from each other. This axial direction extends along the axis of rotation about which the differential carrier is rotatably mounted in the transmission housing. Preferably, the drive gear is arranged on the differential carrier between these differential carrier bearings. More preferably, the differential gear is also arranged between these differential carrier bearings. The drive power can be transmitted from the drive gear to the differential carrier, and from there, the drive power can preferably be transferred to the output shafts via the differential gear.

[0011] For the purposes of the invention, such an output shaft is understood to be a component that is at least substantially rotationally symmetrical and is designed for power transmission (torque, speed). Preferably, the output shafts are rotatably mounted; more preferably, at least two output shafts are arranged coaxially to each other; and more preferably, the axis of rotation of the output shafts coincides with the axis of rotation of the differential housing. Furthermore, preferably, an output shaft is understood to be a device by which the drive power can be transmitted at least partially from the differential gear towards the driven wheels of the motor vehicle. The power transmission to one of the wheels can be interrupted, in particular by a switchable torque transmission device.

[0012] For the purposes of the invention, a switchable torque transmission device is understood to be a device for selectively transmitting power (torque, speed) from an input side to an output side. Preferably, the torque flow of a switchable torque transmission device can be interrupted by a control command. Preferably, the power is transmitted by a positive-locking or friction-locking connection. More preferably, a torque transmission device has at least one sliding sleeve or sliding sleeve, preferably with positive-locking elements. The switchable torque transmission device can, in particular, interrupt the torque flow between the drive gear and the first output shaft. For this purpose, the torque transmission device has, in particular, a torque transmission range.

[0013] For the purposes of the invention, a torque transmission range is understood to be the area of ​​the torque transmission device which can be influenced by a control command in such a way that a drive power can or cannot be transmitted from the input side of the torque transmission device to the output side of the torque transmission device. Figuratively speaking, in the case of a multi-plate clutch with a plurality of frictionally interlocking plates, these plates, in particular their friction surfaces, constitute the torque transmission range of the multi-plate clutch; or, in the case of a dog clutch, the interlocking jaws of this clutch constitute the torque transmission range.

[0014] For the purposes of the invention, the area between the differential carrier bearings is understood to be a specific region in the axial direction, i.e., along the axis of rotation. Preferably, this region extends from the axially outermost point of the first differential carrier bearing to the axially outermost point of the second differential carrier bearing. More preferably, this region extends from a geometric center or center of gravity of a rolling element of the first differential carrier bearing to a center of gravity or center of gravity of a rolling element of the second differential carrier bearing. Even more preferably, this region extends from the axially innermost point of the first differential carrier bearing to the point of the second differential carrier bearing closest to it, i.e., to the innermost point of the second differential carrier bearing.

[0015] According to the invention, the torque transmission range is arranged at least partially in the axial direction between these differential basket bearings. For the purposes of the invention, this means that at least a portion of the power transferable from the input side to the output side of the torque transmission device can be transmitted axially between the differential basket bearings. Figuratively, with regard to a multi-plate clutch, this means that at least one friction surface between a plate and a counter-plate is arranged axially between the differential basket bearings, with further plates and counter-plates also being arranged outside the differential basket bearings. Preferably, at least 1% of the torque transmission range is arranged between the differential basket bearings, preferably at least 20%, more preferably at least 50%, and particularly preferably at least 75%, or most preferably 100%.In particular, such an arrangement of the torque transmission area achieves, on the one hand, the separation of the torque flow and, on the other hand, enables a particularly compact design of the axle drive, thus making an improved axle drive possible.

[0016] In a preferred embodiment, the torque transmission area is arranged radially within at least one of the differential cage bearings. Preferably, the torque transmission area is arranged radially within the differential cage bearing adjacent to the torque transmission area. "Radially within" in this sense means that the torque transmission area is arranged at least within a bearing raceway or, preferably, within a bearing inner ring. This configuration of the torque transmission area, in particular, enables further compaction of the axle drive, thus allowing for an improved axle drive.

[0017] In a preferred embodiment, the torque transmission device comprises a radially inner output section and a radially outer drive section. The output section can be contacted by the drive section within the torque transmission area, and a positive-locking connection is preferably formed between the output and drive sections. Positive-locking connections are particularly suitable for transmitting very high torques while requiring minimal installation space, thus enabling an improved axle drive. Preferably, the drive section is designed as a sliding sleeve, and the output section is designed as a counterpart to and for receiving this sliding sleeve. Furthermore, a jaw coupling connection can preferably be formed between the drive and output sections.

[0018] In a preferred embodiment, the drive part and the driven part each have a first and at least one further, and in particular several further, rows of positive locking elements to form the positive locking connection. Positive locking elements are understood to be, in particular, teeth or claws designed for force transmission. More preferably, at least two successive rows of such positive locking elements are spaced apart from each other in the axial direction by a gap. This gap is further preferably larger than the axial extent of at least one of the rows of positive locking elements.

[0019] In a first operating mode of the torque transmission device, the drive and driven parts are positioned relative to each other such that at least one series of positive locking elements is positioned in one of the gaps between them, on the other component (drive, driven). In particular, due to this positioning of the positive locking elements, or of the drive and driven parts relative to each other, no torque can be transmitted from the drive to the driven part in this operating mode. The torque cannot be transmitted specifically because the positive locking elements of one component (drive, driven) are positioned in the gaps of the other component (drive, driven).

[0020] Preferably in a second operating mode, the output part and the drive part are positioned such that the positive locking elements of the output part can be contacted by the positive locking elements of the drive part, and thus in this operating mode a torque can be transmitted from the drive part to the output part of the torque transmission device, preferably positively transmitted.

[0021] In a particularly preferred embodiment, the drive element is mounted so as to be axially displaceable. Preferably, the drive element is mounted so as to be movable back and forth between a first axial end position and a second axial end position. Preferably, the drive element is mounted so as to be displaceable along the extent of the axis of rotation. This displaceability, in particular, allows the torque transmission device to be switched back and forth between this first and this second operating mode in a particularly simple manner, thus enabling an improved axle drive.

[0022] In a preferred embodiment, the torque transmission device can be switched from its first to its second operating mode by means of an actuator. Preferably, this actuator has a rotatably mounted actuator shaft. More preferably, this actuator shaft and a rotational axis of the torque transmission device, which preferably coincides with the rotational axis of the first output shaft, or the projection of the actuator shaft and the rotational axis into a common plane, form an angle α between 80 and 100°. Particularly preferably, the actuator shaft and the rotational axis, or their projections into a common plane, are arranged orthogonally to each other. Preferably, the actuator has an eccentric that is rotationally fixed to the actuator shaft. More preferably, this eccentric is configured to contact and transfer the drive element from the first to the second end position and / or vice versa.Preferably, the drive element can be subjected to a spring force in the direction of one of the end positions by means of a spring device. The displacement of the drive element between these end positions can be achieved at least partially or completely by a rotation of the actuator shaft and thus of the eccentric.

[0023] In particular, this angular arrangement of the actuator shaft in relation to the rotational axis of the torque transmission device enables a particularly space-saving design of the axle drive, thus making an improved axle drive achievable.

[0024] In a preferred embodiment, the axle drive has at least one further switchable torque transmission device (second torque transmission device). Preferably, this torque transmission device is arranged between the drive gear and the second output shaft. Preferably, the first and second torque transmission devices are identical in design, and this allows for particularly simple control of them.

[0025] This torque transmission device preferably also has a torque transmission range. The torque transmission range of the second torque transmission device is preferably arranged at least partially in the axial direction between these differential cage bearings. In particular, a second switchable torque transmission device reduces or eliminates rolling of the differential gear, especially of the differential gear teeth, and thus a further increase in the efficiency of the axle drive can be achieved.

[0026] In a preferred embodiment, at least one of the output shafts is rotatably mounted relative to the differential carrier by an output shaft bearing. Preferably, this output shaft bearing comprises at least one rolling bearing. A particularly low loss rate can be achieved, especially with a rolling bearing. More preferably, this output shaft bearing comprises at least one plain bearing. A particularly simple bearing arrangement can be achieved, especially with a plain bearing. Preferably, the output shaft bearing comprises at least one, preferably several, rolling bearings with, preferably cylindrical, rolling elements, particularly preferably so-called needle bearings. In particular, mounting the output shafts by means of so-called rolling bearings enables a reduction in the loss rate of the axle drive and thus allows for an improved axle drive.

[0027] In a preferred embodiment, the drive section is rotatably mounted relative to the output section by means of a coupling bearing. Preferably, this coupling bearing comprises at least one rolling bearing. More preferably, the coupling bearing comprises at least one plain bearing. Particularly preferably, the coupling bearing comprises several rolling bearings, preferably at least two. In particular, a rolling bearing for the drive section relative to the output section can further reduce the loss coefficient of the axle drive, thus enabling an improved axle drive. More preferably, at least one needle bearing is provided for this bearing; needle-shaped rolling elements, in particular, allow for a particularly small installation space requirement.

[0028] A method for controlling an axle drive according to the invention, which is particularly designed to transfer the torque transmission device from its first operating state, in which no torque can be transmitted, to its second operating state, in which a torque can be transmitted, comprises at least the following steps: - Determining the rotational speed of the output part, - Determining the rotational speed of the drive component, - Determining a balancing speed from these speeds, - Driving the drive gear until the balancing speed reaches or falls below a predefined threshold.

[0029] In particular, if this threshold is reached or fallen below, the torque transmission device is switched from its first to its second operating state.

[0030] An axle drive according to the invention can be used in an all-wheel-drive vehicle, in particular such that no drive power is supplied to the axle drive by the vehicle's drive system in a first driving condition. In this driving condition, the drivetrain can be operated particularly efficiently. This is because, in this driving condition, the torque transmission device in the axle drive is in its first operating state, i.e., the operating state in which no torque can be transmitted. In this first operating state of the torque transmission device, the axle drive is stationary in such a way that the drive gear is stationary and, in particular, no power loss occurs at the drive gear and its bearings. In an embodiment of the invention in which only one torque transmission device is present, the differential gear engages this first driving state as soon as the vehicle starts moving.The reason for this is, in particular, that one of the output shafts can be decoupled from the drive wheel via the first operating state of the torque transmission device, and the second output shaft is driven by the rotational movement of the wheel.

[0031] If the driving situation requires engaging the previously undriven wheels of the vehicle, this can be achieved by transitioning the torque transmission device into its second operating state. The operating method according to the invention provides for accelerating the drive gear in such a way that the rotational speed of the stationary drive part of the torque transmission device and the rotational speed of the output part of the torque transmission device, which rotates with the wheel, approach each other. The drive gear is preferably accelerated until the difference between the rotational speeds of the drive and output parts reaches or falls below the predefined threshold value.

[0032] In particular, by matching the rotational speeds of the output and drive parts of the torque transmission device, a particularly simple transition from their first to their second operating state is made possible, thus enabling an improved axle drive.

[0033] In a preferred embodiment of the operating method, the threshold value Δ (difference, speed of drive part, output part) is selected from a range for which Δ < 500 rpm (revolutions per minute), preferably < 300 rpm, preferably < 200 rpm and particularly preferably < 100 rpm, and furthermore Δ ≥ 0 rpm, preferably > 10 rpm, preferably > 30 rpm and particularly preferably ≥ 50 rpm. Investigations have shown that for threshold values ​​from the range of values ​​according to the invention, a particularly simple and quick engagement or transition of the torque transmission device from its first to its second operating state is enabled.

[0034] In a preferred embodiment, the torque transmission device is transitioned very quickly from its first to its second operating state. More preferably, the time interval in which the drive element of the torque transmission device is moved from the first axial end position to the second axial end position is selected from a predetermined range. This predetermined range t is < 1 s, preferably < 500 milliseconds (ms), more preferably < 300 ms, and particularly preferably < 200 ms.

[0035] The time required to move the drive element of the torque transmission device from its first axial end position to its second axial end position is understood to mean, in particular, the time elapsed until this drive element is moved from its first axial end position to its second axial end position at least substantially free of load and, in particular, without encountering any obstacles. Specifically, the first axial end position represents the position of the torque transmission device in which no torque can be transmitted, and the second axial end position represents, in particular, the position of the torque transmission device in which torque can be transmitted.

[0036] The invention will be explained in more detail below in connection with the figures. The figures show: Fig. 1 a full section of the axle drive, Fig. 2 a flowchart for the operating procedure according to the invention.

[0037] The axle drive 1 has a drive gear 2, which is mounted in an axle drive housing 3 and rotatably mounted about the axis of rotation 9. The drive gear 2 is fixedly connected to the differential carrier 4. The differential gear 6 is mounted in the differential carrier 4 and is also rotatable with the differential carrier 4 about the axis of rotation 9. Power is transmitted to the drive wheels (not shown) via the two output shafts 7a, 7b. The output shafts 7a, 7b are also rotatably mounted about the axis of rotation 9. For axial support against the differential carrier 4, the output shafts 7a, 7b each have a needle bearing 10, 11.

[0038] The first output shaft 7a has a switchable torque transmission device 8. The switchable torque transmission device 8 has a torque transmission range 8a. The torque transmission range 8a is designed for torque transmission between the drive part 8c and the output part 8d. For torque transmission from the drive part 8c to the output part 8d, the drive part 8c is mounted to be axially displaceable in the axial direction, i.e., in the direction of the axis of rotation 9. For axial displacement, the drive part 8c is subjected to a force in the direction of the axis of rotation 9 by the actuator 13. To generate this force, the actuator 13 has an eccentric 13c. This eccentric 13c is rotationally fixed to the output shaft 13a of the actuator 13 and is thus rotatably mounted about the axis of rotation 13b of the output shaft 13a. The drive unit 8c has several rows 8c for transmitting the drive torque.The output part 8d has 1 (4 rows) of teeth (positive locking elements) for torque transmission. The teeth 8c.1 are arranged at least largely in alignment in the circumferential direction. Furthermore, the output part 8d has the same number of rows of teeth 8d.1 (4 rows) for torque transmission.

[0039] In the Fig. In the switching position shown in Figure 1, the drive part 8c is in its first axial end position, i.e., the different rows of teeth 8c.1 and 8d.1 are positioned relative to each other in such a way that these rows of teeth slide past each other in the circumferential direction around the axis of rotation 9, and thus no torque can be transmitted from the drive part 8c to the output part 8d.

[0040] To improve efficiency, the output section 8d is rotatably mounted relative to the input section 8c by a rolling bearing 12. The output section 8d has an additional rolling bearing 12a relative to the axial gear housing 3.

[0041] Area A shows the axial distance between the rolling bearings 5a, 5b for the differential cage 4 relative to the housing 3. Area B indicates the axial extent of the torque transmission area 8a of the torque transmission device 8. It is clearly evident that the torque transmission area 8 (area B) at least partially overlaps the axial distance of the rolling bearings 5a, 5b (area A) and thus the torque transmission area 8a is located, at least partially, between the differential cage bearings 5a / b in the axial direction along the axis of rotation 9.

[0042] Fig. Figure 2 shows a flowchart for an operating procedure for an axle drive according to the invention. This operating procedure relates in particular to the engagement, i.e., the transition of the torque transmission device from its first operating state to its second operating state.

[0043] As explained, in the first operating state no torque can be transmitted from the drive side to the output side of the torque transmission device, and in the second operating state torque can be transmitted.

[0044] The procedure begins with determining the rotational speed of the drive component of the torque transmission device. Next, the rotational speed of the output component is determined. Determining the rotational speed refers specifically to measuring it using a direct or indirect method. Indirect measurement of the rotational speed means that the rotational speed of the component (drive / output component) is not determined directly, but rather the rotational speed of another component rotating at a specific speed ratio to the drive or output component.

[0045] A balancing speed is then determined from the rotational speeds of the drive and driven parts. Specifically, the balancing speed represents the difference (magnitude) in rotational speed between the drive and driven parts. This balancing speed Δ is compared to a predefined threshold value. If the balancing speed is less than or equal to this threshold value, a control command is issued to the torque transmission device, switching it from its first to its second operating state.

[0046] Investigations have shown that in an operating method according to the invention, a speed difference of < 500 rpm is particularly advantageous.

[0047] Further investigations have shown that the shifting of the drive unit to transition the torque transmission device into its second operating state should occur within a time span of less than one second. Particularly with larger speed differences Δ and switching times longer than one second, switching errors can occur; that is, if the speed difference Δ is too large and / or the switching time is too slow, the torque transmission device cannot be transitioned from its first to its second operating state. Such occurrences, in particular, lead to a reduction in comfort.

Claims

[1] Axle drive (1), comprising a drive gear (2), a gearbox housing (3), a differential basket (4) rotatably mounted in the gearbox housing (3) by a first and a second differential basket bearing (5a / b), wherein these bearings (5a / b) are spaced apart from each other in an axial direction (A), a differential gear (6), a first and a second output shaft (7a / b) and at least one switchable torque transmission device (8) arranged between the drive gear (2) and the first output shaft (7a) and having a torque transmission range (8a) for interrupting a torque flow between the drive gear (2) and the first output shaft (7a), wherein the torque transmission area (8a) is at least partially arranged in the axial direction between these differential basket bearings (5a / b), wherein the torque transmission device (8) has a radially inner output part (8d) and a radially outer drive part (8c) and wherein the output part (8d) can be contacted by the drive part (8c) in the torque transmission area (8a) and a positive-locking connection can be formed between the output part (8d) and the drive part (8c) and wherein the drive part (8c) is designed as a sliding sleeve and the The output part (8d) is designed as a counterpart to and for receiving this sliding sleeve, and the drive part (8c) is mounted to be displaceable in the axial direction. characterized by , that the torque transmission device (8) can be transferred from its first to its second operating mode with an actuator (13), that the actuator (13) has a rotatably mounted actuator shaft (13a), that the actuator shaft (13a) and a rotation axis (9) of the torque transmission device (8) enclose an angle α of 80° to 100°, and that the drive part (8c) and the driven part (8d) each have a first and at least one further row of positive locking elements (8c.1, 8d.1) for positive locking connection with each other, and that two successive rows are spaced apart from each other by a gap in the axial direction, and that this gap is larger than the axial extent of at least one of the rows of positive locking elements (8c.1, 8d.1), and that the actuator (13) has an eccentric (13c) that is rotationally fixed to the actuator shaft (13a), and that this eccentric (13c) is configured for contacting and transferring the drive part (8c) from the first to the second end position, and that the drive part (8c) opposite the output part (8d) with a coupling bearing (12) is rotatably mounted and that the coupling bearing (12) has at least one rolling bearing. [2] Axle drive (1) according to claim 1, characterized by , that the actuator shaft (13a) is arranged orthogonally to this axis of rotation (9). [3] Axle drive (1) according to one of the preceding claims, wherein characterized that this has a further switchable torque transmission device which is arranged between the drive gear (2) and the second output shaft (7b) and has a torque transmission range, and, that the torque transmission area in the axial direction is at least partially arranged between these differential basket bearings (5a / b). [4] Axle drive (1) according to one of the preceding claims, wherein characterized that at least one of the output shafts (7a / b) is rotatably mounted relative to the differential basket (4) with an output shaft bearing (10, 11), that the output shaft bearing has at least one rolling bearing (10,11). [5] Method for operating an axle drive (1) according to one of the preceding claims for transferring the torque transmission device (8) from a first operating state in which no torque can be transmitted to a second operating state in which a torque can be transmitted, with the steps, - Determining a rotational speed n 8d of the output part (8d), - Determining a rotational speed n 8c of the drive part (8c), - Determining a balancing speed Δ = magnitude (n 8d - n 8c ) from these rotational speeds (n 8c , n 8d ), - Driving the drive gear (2) until the balancing speed Δ reaches or falls below a predefinable threshold value, - Convict at least one of the Torque transmission devices (8) into the second operating state. [6] Method for operating an axle drive according to claim 5, characterized by , that the threshold is selected from a range for which the following applies: threshold less than 500 1 / min and threshold greater than or equal to 0 1 / min. [7] Method for operating an axle drive according to one of claims 5 or 6, characterized by , that the time for axial displacement of the drive part (8c) from a first axial end position to a second axial end position is selected from a certain range, wherein this range is less than 1 second.

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