Electrically driven axle with a central actuator arrangement for a motor vehicle

Abstract

An electrically driven axle (1) for a motor vehicle comprises: a first half-shaft (2); a second half-shaft (3); a first parking lock unit (4), wherein the first parking lock unit (4) is associated with the first half-shaft (2); a second parking lock unit (5), wherein the second parking lock unit (5) is associated with the second half-shaft (3), wherein the first parking lock unit (4) and the second parking lock unit (5) are mechanically connected to each other via a connecting rod (6); and a central actuator device (7), wherein the actuator device (7) is connected to the connecting rod (6) in an adjustably manner.

Description

Technical Field

[0001] The invention relates to an electrically driven axle for a motor vehicle, comprising: a first half-shaft; a second half-shaft; a first parking lock unit, wherein the first parking lock unit is associated with the first half-shaft; a second parking lock unit, wherein the second parking lock unit is associated with the second half-shaft, wherein the first parking lock unit and the second parking lock unit are mechanically connected to each other via a connecting rod; and a central actuator device, wherein the actuator device is connected to the connecting rod in an adjustably manner. Background Art

[0002] To achieve so-called "parking maneuvers," conventional manual transmission motor vehicles have a parking brake, which is essential in all motor vehicles. Furthermore, in manual transmission motor vehicles, the vehicle itself can be held in gear because the clutch between the transmission and the internal combustion engine is usually closed.

[0003] Even in automatic motor vehicle transmissions, "parking management" is necessary, and this is usually achieved via a parking lock. Therefore, torque converter automatic transmissions often have an additional parking lock, and automatic shift or dual-clutch transmissions also have a parking lock, especially if their friction clutch(es) are normally open. The parking lock can be actuated purely mechanically by the driver via an operating element ("P position" of the gear lever). It is also possible to actuate the parking lock automatically by button pressure ("park by wire") or when the engine is stopped. In these cases, a corresponding actuator provided specifically for this purpose in the transmission is required to actuate the parking lock.

[0004] JP2009-137427A discloses an electric axle having two electric motors along the drive axle. It also includes two parking locks, which are again positioned upstream of a reduction gearbox in terms of force flow. The reduction gearbox is a planetary gearbox.

[0005] The parking levers can also be operated parallel to each other, but this only results in two parallel linear movements. The connecting rods do not produce a rotational movement.

[0006] JP2008-151308A also shows a kind of electric axle with two parking locks, and described parking lock acts on the axle of wheel motor respectively.Here, also do not act on the gearbox part of drive.

[0007] WO2017 / 051719A1 discloses a vehicle drive system with two motors that can operate left and right parking lock mechanisms using actuators. The vehicle drive system features a parallel-axis gearbox reduction ratio, with a parking gear, capable of rotating integrally with the input gear shaft, located on the inner side of each of the two parallel-axis reducers' input gear shafts. The parking lock is activated linearly via a parking lever.

[0008] All necessary actuators usually entail considerable costs and installation space requirements, which should be reduced. Summary of the Invention

[0009] The object of the present invention is to propose an electrically driven axle for a motor vehicle, which is characterized by a multifunctional actuating device for two independent parking locks.

[0010] This requirement can be met by the electrically driven axle according to the invention. Advantageous embodiments of the invention are described below.

[0011] An electrically driven axle for a motor vehicle according to the present invention comprises a first parking lock unit and a second parking lock unit. The first parking lock unit is associated with a first axle half of the electrically driven axle, and the second parking lock unit is associated with a second axle half of the electrically driven axle. Furthermore, according to the present invention, the electrically driven axle comprises a central actuator device. The actuator device is used to actuate at least the two parking lock units.

[0012] For this purpose, according to the invention, the first parking lock unit and the second parking lock unit are mechanically connected to one another via a connecting rod, wherein the actuator device is adjustably connected to the connecting rod.

[0013] The design of the electric axle according to the invention makes it possible to actuate two independent parking lock units in a simple manner via a central, multifunctional actuator device. This allows for a space-optimized and cost-optimized electrically driven axle.

[0014] The first half shaft of the electric drive axle is preferably connected or connectable in a drivable manner to the first electric machine 8 , and the second half shaft 3 of the electric drive axle is preferably connected or connectable in a drivable manner to the second electric machine 9 .

[0015] In a preferred embodiment variant of the invention, the actuator arrangement comprises a main actuator, an emergency actuator and a spring energy store, wherein the main actuator is preferably designed as an electric motor and the emergency actuator is preferably designed as a linear magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described below by way of example with reference to the accompanying drawings.

[0017] Figure 1 A schematic diagram of an electrically driven axle according to the present invention is shown.

[0018] Figure 2 Shown for actuation Figure 1 Isometric view of the central actuator arrangement of the parking lock unit. DETAILED DESCRIPTION

[0019] exist Figure 1 1 shows a schematic diagram of an exemplary embodiment variant of an electrically driven axle 1 for a motor vehicle according to the invention.

[0020] In this embodiment variant, the front axle of a motor vehicle is designed as an electrically driven axle 1 according to the invention.

[0021] The electrically driven axle 1 comprises a first half-shaft 2 and a second half-shaft 3 , wherein a wheel R1 , R2 is mounted on each end of the respective half-shaft 2 , 3 .

[0022] The electrically driven axle 1 has two electric machines, namely a first electric machine 8 and a second electric machine 9 .

[0023] Furthermore, the electrically driven axle 1 has power electronics with a first inverter 15 and a second inverter 16 . The first inverter 15 is functionally connected to the first electric machine 8 , and the second inverter 16 is functionally connected to the second electric machine 9 .

[0024] The first motor 8 can be drivably connected to the first half shaft 2 of the electric drive axle 1 via the first gearbox 13. The torque generated by the first motor 8 can be transmitted to the first half shaft 2 via the first gearbox 13 and then to the wheel R1 connected to the first half shaft 2.

[0025] The second motor 9 can be drivably connected to the second half shaft 3 of the electric drive axle 1 via the second gearbox 14. The torque generated by the second motor 9 can be transmitted to the second half shaft 3 via the second gearbox 14 and then to the wheels R2 connected to the second half shaft 3.

[0026] The first gearbox 13 and the second gearbox 14 are respectively configured as a two-speed gearbox having a first gear and a second gear. In this embodiment, the first gearbox 13 and the second gearbox 14 are identically configured.

[0027] In the two gearboxes, a parking lock wheel 18a, 18b is placed on the output shaft 30a, 30b. Thus, the locking function can be implemented directly in the corresponding gearbox, which allows the half shafts 2 and 3 to be locked safely.

[0028] Figure 2An isometric view of a central actuator device 7 for actuating the first parking lock unit 4 and the second parking lock unit 5 of the described electrically driven axle 1 is shown.

[0029] The first parking lock unit 4 and the second parking lock unit 5 are mechanically connected to each other via a connecting rod 6. An actuator device 7 is adjustably connected to the connecting rod 6, which is actuated centrally via a single actuator device 7. The actuator device is arranged on one of the two transmissions, in this example on the transmission 13.

[0030] The connecting rod 6 is connected to the first operating shaft 20 a via a first lever 23 a and to the second operating shaft 20 b via a second lever 23 b .

[0031] The two actuating shafts 20 a , 20 b are held in position independently of one another by locking pins 24 a , 24 b .

[0032] Connecting rod 6 is connected to levers 23a and 23b via keyhole connections. Connecting rod 6 can transmit both pulling and pushing forces. This linear push-pull motion induces rotational motion around operating axes 20a and 20b via levers 23a and 23b. Converting linear motion into rotational motion further saves structural space.

[0033] The first parking lock unit 4 and the second parking lock unit 5 are designed identically and each have a parking lock pawl 17 a , 17 b which engages in a respective parking lock wheel 18 a , 18 b when the respective parking lock unit 4 , 5 is actuated.

[0034] The actuator arrangement 7 comprises a main actuator 10, an emergency actuator 11 and a spring energy store 12. In the present exemplary embodiment, the main actuator is designed as an electric motor 10a and the emergency actuator is designed as a linear magnet 11a.

[0035] The parking lock units 4 and 5 are engaged by rotating the gear section 19 via the electric motor 10. This causes the spring energy accumulator 12, located between the gear section 19 and the connecting rod 6, to move via the lever arm. In this case, the spring energy accumulator 12 can be assumed to be rigid. The spring energy accumulator 12 again rotates the connecting rod 6, which is connected on both sides to the actuating shafts 20a and 20b of the respective parking lock units 4 and 5. Via the respective actuating shafts and respective torsion springs 21a and 21b, the respective cams 22a and 22b, rotatably mounted on the respective actuating shafts 20a and 20b, rotate onto the respective parking lock pawls 17a and 17b of the respective parking lock units 4 and 5. The parking lock pawls 17a and 17b then lock into the respective parking lock wheels 18a and 18b of the respective parking lock units 4 and 5.

[0036] The parking lock units 4 , 5 are released by operating the electric motor 10 a in the opposite direction of rotation.

[0037] Redundant actuation (emergency actuation) is achieved via the spring accumulator 12 and the linear magnet 11a - the preloaded spring accumulator 12 is unlocked by means of the linear magnet 11a. The respective cam 22a, 22b then actuates the respective parking lock pawl 17a, 17b.

[0038] Reference Signs List

[0039] 1 Electric drive axle

[0040] 2 First semi-axis

[0041] 3 Second semi-axle

[0042] 4 First parking lock unit

[0043] 5 Second parking lock unit

[0044] 6 Connecting rod

[0045] 7 Actuator device

[0046] 8 First Motor

[0047] 9 Second motor

[0048] 10 Main actuator

[0049] 10a electric motor

[0050] 11 Emergency actuator

[0051] 11a Linear magnet

[0052] 12 Spring accumulator

[0053] 13 First gearbox

[0054] 14 Second gearbox

[0055] 15 First Inverter

[0056] 16 Second inverter

[0057] 17a, b Parking lock pawl

[0058] 18a, b Parking lock wheel

[0059] 19 gear sections

[0060] 20a, b operating shaft

[0061] 21a, b torsion spring

[0062] 22a, b cam

[0063] 23a, b Leverage

[0064] 24a, b Locking pin

[0065] 30a, 30b output shaft

[0066] R1 and R2 wheels

Claims

1. An electric drive axle (1) for a motor vehicle, comprising - first semi-axis (2), - the second semi-axle (3), - a first parking lock unit (4) in a first gearbox (13), wherein said first parking lock unit (4) is associated with said first half-shaft (2), - a second parking lock unit (5) in a second gearbox (14), wherein said second parking lock unit (5) is associated with said second half-shaft (3), wherein the first parking lock unit (4) and the second parking lock unit (5) are mechanically connected to each other via a connecting rod (6), the connecting rod being mechanically connected to each other via a first lever (23a) and a first operating shaft (20a) and mechanically connected to each other via a second lever (23b) and a second operating shaft (20b), and - a central actuator device (7), wherein the actuator device (7) is adjustably connected to the connecting rod (6), The first lever rotates to actuate the first operating shaft, and the second lever rotates to actuate the second operating shaft.

2. The electrically driven axle (1) according to claim 1, It is characterized by: The first half-shaft (2) is connected or connectable to a first electric motor (8) in a drivable manner, and the second half-shaft (3) is connected or connectable to a second electric motor (9) in a drivable manner.

3. The electrically driven axle (1) according to claim 1 or 2, It is characterized by: The actuator device (7) comprises a main actuator (10), an emergency actuator (11) and a spring energy accumulator (12).

4. The electrically driven axle (1) according to claim 3, It is characterized by: The main actuator (10) is an electric motor (10a) and the emergency actuator (11) is a linear magnet (11a).

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