WO2018095544A1

WO2018095544A1 - Drive arrangement for a motor vehicle

Info

Publication number: WO2018095544A1
Application number: PCT/EP2016/078927
Authority: WO
Inventors: Sascha Miebach; Thorsten Fischer; Marc Absenger
Original assignee: Gkn Automotive Ltd.
Priority date: 2016-11-28
Filing date: 2016-11-28
Publication date: 2018-05-31

Abstract

The invention relates to a drive arrangement for a motor vehicle, comprising a reduction transmission, wherein a drive shaft, which can be driven in a rotating manner, an output shaft, and at least one wheel set are part of a power path for transferring torque from the drive shaft to the output shaft, comprising a parking lock device for reversibly blocking the reduction transmission, and comprising a clutch coupling in the power path between the drive shaft and the output shaft, wherein the clutch coupling is provided both for separating and closing the power path and for actuating the parking lock device.

Description

Drive arrangement for a motor vehicle

The application relates to a drive arrangement for a motor vehicle, comprising a reduction gear, wherein a rotatably driven drive shaft, an output shaft and at least one gear set to a power path for transmitting torque from the drive shaft to the output shaft, a Sperrper reneinrichtung for reversibly blocking the reduction gear and a clutch in the power path between the drive shaft and the output shaft, wherein the clutch is provided for both separating and closing the power path, as well as for actuating the parking brake device. Parking locks are used in power trains of motor vehicles to optionally block a drive member in the drive train, so that the motor vehicle is prevented from rolling away unintentionally when the electric machine does not provide torque. A parking brake may comprise a blocking element cooperating with a drive component of the drive train and an actuator, wherein the actuator may be provided for actuating the blocking element, for example to transfer the blocking element into a closed position in which the blocking element blocks a locking wheel. Another variant is that the blocking element is designed to be stationary and is coupled to a drive component.

From DE 10 2009 023 498 A1 an electric drive arrangement with an electric motor, a spur gear and a differential gear is known. A parking brake assembly is provided to inhibit the rotational movement of a drive shaft of the assembly such that the motor vehicle is prevented from unintentionally rolling away. The parking lock assembly includes a locking mechanism having a pawl and a lock gear, and an electromagnetic actuator for actuating the lock mechanism. The lock wheel is equipped with an output shaft connected to the spur gear, which is arranged with radial offset between the drive axis of the electric motor and the axis of rotation of the differential gear. From DE 10 2005 022 926 B3 a drive unit for a motor vehicle with an electric drive motor and a change gear with at least two gear ratios is known, wherein a motor shaft of the drive motor or a drive shaft connected thereto via a constant gear set is connected to an output shaft of the transmission. A parking brake device engages on a motor shaft of the drive motor or on a drive shaft connected thereto in a rotationally fixed manner. The parking lock device has a locking sleeve, which is axially displaceable between a release position and a locking position. In a housing fixed portion of the drive unit, the locking sleeve is axially guided to establish the locking position. An actuator assembly is used both for actuating the parking brake device, as well as for the operation of clutches for engaging or disengaging the gears, the transmission.

An object of the present invention is to provide a clutch assembly for a motor vehicle with a reduction gear and a parking brake device, which is structurally simpler in construction, or allows easy installation and has a more compact design, as the prior art.

The object is achieved by a clutch arrangement for a motor vehicle according to claim 1. In the dependent claims preferred embodiments and advantageous developments are given.

The drive arrangement according to the invention for a motor vehicle has a reduction gear, wherein a drive shaft rotatably drivable, an output shaft and at least one gear set to a power path for transmitting torque from the drive shaft to the output shaft. Furthermore, the drive arrangement according to the invention comprises a parking brake device for reversibly blocking the reduction gear and a clutch in the power path between the drive shaft and the output shaft, wherein the switching clutch is provided for both separating and closing the power path, as well as for actuating the parking brake device. According to the invention it is further provided that the clutch has an adjustable between a drive position, a neutral position and a parking position coupling element, wherein the coupling element in the drive position coupled to the wheelset for transmitting torque and wherein the coupling element in the park position, the parking brake device is actuated such that the reduction gear is blocked. An advantage of the drive arrangement according to the invention is that the clutch with the adjustable in three positions coupling element opens a structurally particularly simple way to turn on and off the torque flow through the transmission gear and also block the transmission gear by means of the parking brake device.

Disconnecting the power path through the clutch means, in the context of the invention, to interrupt a power flow, so that no torque is transmitted. Accordingly, closing the power path through the clutch means, within the meaning of the invention, producing a power flow, so that torque is transmitted. For the purposes of the invention, the neutral position means a position of the coupling element in which the power flow is interrupted, so that no torque is transmitted, and the parking lock is just as little activated or actuated, so that the transmission gear is not blocked. The transmission elements of the power path are therefore rotatable in the neutral position of the coupling element without torque to transmit. The neutral position of the coupling element is particularly advantageously arranged between the drive position and the parking position, so that an adjustment of the coupling element from the drive position to the parking position and vice versa is possible only via the neutral position. According to a preferred embodiment of the drive arrangement is provided that the gear set has a rotatably connected to the drive shaft drive wheel and a rotatably mounted on the output shaft idler gear to form the at least one switchable reduction stage. The output shaft has, for example a driven gear for transmitting torque to a differential gear, wherein the parking brake device particularly preferably engages the output shaft.

According to a further preferred embodiment of the drive arrangement is provided that the coupling element is designed in the form of a relative to the output shaft rotatably held and axially displaceable sliding sleeve, wherein the sliding sleeve, for example, has an internal toothing for rotationally fixed connection with an external toothing of the output shaft. In particular, the external toothing of the output shaft can be formed in the form of at least two outer toothed sections, one of the outer toothed sections being provided in each case for the drive position and for the parking position of the sliding sleeve. Further preferably, the sliding sleeve on a side facing the intermediate gear on a first outer toothing, which is in the drive position with an internal toothing of the idler gear engaged. Further preferably, the sliding sleeve on a side facing the parking lock arrangement on a second outer toothing, which is in the parking position with a housing-fixed portion of the parking brake assembly engaged.

According to a further preferred embodiment of the drive arrangement, it is provided that the shift clutch has an actuator, wherein the coupling element, in particular in the form of a sliding sleeve, is axially displaceable by means of the actuator. The coupling element, in particular in the form of a sliding sleeve, is preferably resiliently biased in the direction of the parking position. For this purpose, the actuator in particular has a spring device in order to elastically bias the coupling element, in particular in the form of a sliding sleeve, in the direction of the parking position. Due to the bias is advantageously allows the parking position can be selected as a switching stage without the actuator can transfer the coupling element in the parking position, for example, because the speeds of the output shaft and the parking brake device have too large a difference. The coupling element is then transferred by the bias in the parking position as soon as the speed difference has reached a value that allows activating the parking position.

In the coupling element in the form of a sliding sleeve is preferably a skip provided gene of the corresponding teeth between the sliding sleeve and the parking brake device. Particularly preferably, at least one of the parkper- renseitigen teeth of the sliding sleeve is frontally tapered running. Depending on whether the internal toothing or the external toothing of the sliding sleeve is tapered, so pointed, is particularly preferred either the corresponding outer toothed portion of the output shaft in the parking position or an internal toothing of the housing fixed portion of the parking brake assembly on a side facing the sliding sleeve tapered running frontally , In principle, both the internal toothings and the external toothings can also be designed to taper at the ends. The frontally tapered teeth advantageously allow skipping without causing damage to the teeth. By skipping the gears, the rotational speeds of the output shaft and the parking brake device are equalized until activation of the parking brake by engaging the sliding sleeve in the park position is possible.

The invention will be explained in more detail with reference to an embodiment with reference to the accompanying drawings. The statements are merely exemplary and do not limit the general idea of the invention. Show it

Figure 1 is a schematic representation of an embodiment of a drive arrangement according to the invention for a motor vehicle with a clutch in a neutral position;

FIG. 2 shows the drive arrangement according to FIG. 1 with the clutch in a parking position;

FIG. 3 shows the drive arrangement according to FIG. 1 with the shift clutch in a drive position; and

Figure 4 shows the drive assembly according to Figure 1 with the clutch in a neutral position at preselected parking position. In the figures 1 to 4, an embodiment of a drive arrangement according to the invention for a motor vehicle is shown schematically. The construction of the drive arrangement is identical in FIGS. 1 to 4 and will first be described jointly with reference to all figures. The drive assembly comprises a reduction gear 4, wherein a drive shaft 9 driven by a drive motor 1, an output shaft 10 and a gear set 14, 15 belong to a power path for transmitting torque from the drive shaft 9 to the output shaft 10. The output shaft 10 further includes a driven gear 24 for transmitting torque to a differential gear 5. The drive shaft 9 and the output shaft 10 form with the wheelset 14, 15 a switchable reduction stage. In the illustrated embodiment, the gear set 14, 15 a with the drive shaft 9 rotatably connected drive wheel 14 and a rotatably mounted on the output shaft 10 idler gear 15. The drive assembly according to the invention further comprises a parking lock device 6 for reversibly blocking the reduction gear 4, wherein the parking brake device 6 engages here on the output shaft 10. It would also be conceivable that the parking brake device 6 engages the drive shaft 9 or the differential gear 5. In the exemplary embodiment, the parking brake arrangement 6 has a housing-fixed section 2 in the form of a ring aligned concentrically with the output shaft 10.

The drive motor 1 is preferably an electric machine 1 with a stator and a rotatable rotor (not shown), the latter drivingly drives the drive shaft 9 when the electric machine 1 is energized. The rotational movement of the drive shaft 9 is transmitted to the differential gear 5 via the reduction gear 4 located downstream in the power path. The electric machine 1 is supplied with electric power by a battery (not shown). The electric machine 1 may operate in a motor mode, converting electrical energy into mechanical energy for driving a drive axle of the vehicle, or in a generator mode, converting mechanical energy into electrical energy, which may then be stored in the battery. The reduction gear 4 is intended to translate a introduced from the drive shaft 9 rotational movement from fast to slow. Thus, an input part of the Differential gear 5 by a multiple slower than the drive shaft 9 of the electric machine. 1 The differential gear 5 divides the introduced torque on two output shafts 23, which serve to drive the associated vehicle wheel.

The drive assembly according to the invention further comprises a clutch 12, which is arranged in the power path between the drive shaft 9 and the output shaft 10, wherein the clutch 12 is provided both for separating and closing the power path, as well as for actuating the parking brake device 6. For this purpose, the clutch 12 has an adjustable between a drive position A, a neutral position N and a parking position P coupling element 7, wherein the coupling element 7 in the drive position A the gear set 14, 15 couples for transmitting torque and wherein the coupling element 7 in the parking position P the parking brake device 6 is actuated such that the reduction gear 4 is blocked, which will be further explained below with reference to the individual figures 1 to 4. The clutch 12 has an actuator 3, which is designed in the present example, for example in the form of an electromechanical actuator and by an electronic control unit (not shown) can be controlled. It is understood that the actuator 3 may alternatively be designed, for example, in the form of an electromagnetic, hydraulic or pneumatic actuator.

In the figure 1, the drive assembly according to the invention with the coupling element 7 in the neutral position N is shown. A shown on the actuator 3 of the clutch 12 double arrow P indicates schematically a donor or selector lever, which specifies the desired or predetermined position and function, here the designated N neutral position. The actuator 3 is used for axial displacement of the coupling element 7, which takes place for example via a shift fork 8. The actuator 3 has a spring device 1 1 in order to elastically bias the coupling element 7 in the direction of the parking position P (FIG. 2), which will be explained in more detail later in connection with FIG. The coupling element 7 is preferably designed in the form of a relative to the output shaft 10 rotatably held and axially displaceable sliding sleeve 7, wherein the sliding sleeve 7 has an internal toothing 18 for non-rotatable connection with external teeth 16, 17 of the output shaft 10, wherein the external teeth of the output shaft 10 in at least two outer teeth sections 16, 17 is formed, wherein a first outer toothing portion 16 for the drive position A (Figure 3) and a second outer toothing portion 17 for the parking position P (Figure 2) of the sliding sleeve 7 is provided. The outer toothing sections 16, 17 and the inner toothing 18 of the sliding sleeve 7 are provided with reference numerals in the interest of clarity only in FIG. In the neutral position N according to Figure 1, the power path is interrupted, the reduction gear 4 transmits no torque. The parking lock 6 is not activated. The neutral position N of the coupling element 7 and the sliding sleeve 7 is disposed between the drive position A and the parking position P.

To activate the parking brake 6, the sliding sleeve 7 is moved by the actuator 3 from the neutral position N to the right in the parking position P shown in Figure 2. The described in connection with Figure 1 second outer toothing portion 17 is in engagement with the internal toothing 18 of the sliding sleeve 7, which is thus rotatably connected to the output shaft 10. The sliding sleeve 7 has two external teeth 19, 20, a first external toothing 19 on a side facing the gear set 14, 15 and a second external teeth 20 on one of the parking brake assembly 6 facing side, provided in the interest of clarity only in Figure 2 with reference numerals are. The second external teeth 20 is in the parking position P with the housing-fixed portion 2 of the parking brake assembly 6 engages and blocks the output shaft 10, and via the output gear 24, the differential gear 5. To release the parking brake 6, the sliding sleeve 7 by the actuator 3 from the Parking position P to the left shifted back into the neutral position N shown in Figure 1.

To close the power path, the sliding sleeve 7 is moved by the actuator 3 from the neutral position N (Figure 1) out to the left in the drive position P shown in Figure 3. The first outer toothed section 16 described in connection with FIG. 1 is in engagement with the inner toothing 18 of the sliding sleeve 7, which is thus connected in a rotationally fixed manner to the output shaft 10. The intermediate gear 15 facing the first outer toothing 19 of the sliding sleeve 7 is in the drive position A with an internal toothing 21 of the intermediate 15 in engagement, so that the intermediate 15 is rotatably connected to the output shaft 10. The tion path is closed and torque can be transmitted from the drive shaft 9 to the output shaft 10, or from the drive motor 1, preferably an electric motor to the differential gear 5. To disconnect the power path, the sliding sleeve 7 is moved by the actuator 3 out of the drive position P to the right, back into the neutral position N shown in FIG.

4 shows a special position of the clutch 12 is shown, in which the actuator 3 is already in accordance with the direction indicated by the double arrow D Schaltstellungs- specification in the position provided for the parking position P, the shift fork 8 but the sliding sleeve 7 is not yet in the park position P has moved. The sliding sleeve 7 is still in the neutral position N. This special position arises when the output shaft 10 has too high a speed difference with respect to the parking brake device 6, wherein in the embodiment, the parking brake device 6 with a housing-fixed section 2 has no speed. For this case, the actuator 3, the spring device 1 1, which biases the coupling element 7 in the direction of the parking position P (Figure 2) elastically, so that the sliding sleeve 7 engages in the housing-fixed section 2, as soon as the speed difference permits. In this case, it is preferable to skip over the corresponding toothings between the sliding sleeve 7 and the parking brake device 6, which preferably have a tapered end face. Thus, it is possible for the second outer toothing section 17 of the output shaft 10 and the inner toothing 18 of the sliding sleeve 7 to have a tapering tapering, such that there is a skip between the output shaft 10 and the sliding sleeve 7. Alternatively or additionally, the second outer toothing 20 of the sliding sleeve 7 and an internal toothing 22 of the housing-fixed portion 2 of the parking brake assembly 6 on the sides facing each other be tapered on the front side, so that there is a skip between the housing fixed portion 2 and the sliding sleeve 7. LIST OF REFERENCE NUMBERS

1 drive motor

2 housing fixed section

3 actuator

4 reduction gear

5 differential gear

6 parking lock device

7 coupling element, sliding sleeve

8 shift fork

9 drive shaft

10 output shaft

1 1 spring device

12 clutch

14 drive wheel of the wheelset

15 intermediate wheel of the wheelset

16 First external gear section

17 Second external gear section

18 Internal toothing of the sliding sleeve

19 First external toothing

20 Second external toothing

21 internal toothing of the intermediate gear

22 Internal teeth of the section fixed to the housing

23 output shafts

24 output gear

P Parking position

N neutral position

A drive position

D double arrow

Claims

claims

1 . A drive assembly for a motor vehicle, comprising a reduction gearbox (4), wherein a rotationally drivable drive shaft (9), an output shaft (10) and at least one gear set (14, 15) belong to a power path for transmitting torque from the drive shaft to the output shaft, a parking lock device (6) for reversibly blocking the reduction gear, and a clutch (12) in the power path between the drive shaft and the output shaft, wherein the clutch is provided both for separating and closing the power path, as well as for actuating the parking brake device, characterized in that the coupling (12) has a coupling element (7) which can be adjusted between a drive position (A), a neutral position (N) and a parking position (P), wherein the coupling element in the drive position couples the gear set (14, 15) for transmitting torque and wherein the coupling element in the parking position, the parking brake neinrichtung (6) actuated such that the reduction gear is blocked.

2. Drive arrangement according to claim 1, characterized in that the drive shaft (9) and the output shaft (10) with the gear set (14, 15) form at least one switchable reduction stage.

3. Drive arrangement according to one of the preceding claims, characterized in that the output shaft (10) has a driven gear (24) for transmitting torque to a differential gear (5), wherein the parking brake device (6) engages the output shaft.

4. Drive arrangement according to one of the preceding claims, characterized in that the wheelset with the drive shaft (9) rotatably connected drive wheel (14) and on the output shaft (10) rotatably mounted intermediate wheel (15).

5. Drive arrangement according to one of the preceding claims, characterized in that the neutral position (N) of the coupling element (7) between the drive position (A) and the parking position (P) is arranged.

6. Drive arrangement according to one of the preceding claims, characterized in that the coupling element (7) in the form of a relative to the output shaft (10) rotatably held and axially displaceable sliding sleeve (7) is executed.

7. Drive arrangement according to claim 6, characterized in that the sliding sleeve (7) has an internal toothing (18) for non-rotatable connection to an external toothing of the output shaft (10), wherein the external toothing of the output shaft in at least two outer toothing sections (16, 17) is formed , wherein in each case one of the outer toothing sections for the drive position (A) and for the parking position (P) of the sliding sleeve is provided.

8. Drive arrangement according to one of claims 6 or 7, characterized in that the sliding sleeve (7) on a said intermediate wheel (15) facing Side has a first external toothing (19) which is in the drive position (A) with an internal toothing (21) of the intermediate gear engaged.

9. Drive arrangement according to one of claims 6 to 8, characterized in that the sliding sleeve (7) on one of the parking lock arrangement (6) side facing a second external toothing (20) which in the parking position (P) with a housing fixed portion (2 ) of the parking lock assembly is engaged.

10. Drive arrangement according to one of the preceding claims, characterized in that the coupling element (7) in the parking position (P) is resiliently biased.

1 1. Drive arrangement according to one of the preceding claims, characterized in that the switching clutch (12) has an actuator (3), wherein the coupling element (7) by means of the actuator is axially displaceable.

12. Drive arrangement according to claim 1 1, characterized in that the actuator (3) has a spring device (1 1) to bias the coupling element (7) in the direction of the parking position (P) elastic.

13. Drive arrangement according to one of claims 7 to 12, characterized in that at least one of the parksperrenseitigen teeth of the sliding sleeve (7) is designed to taper at the end face.

14. Drive arrangement according to one of claims 7 to 13, characterized in that an outer toothed portion (17) of the output shaft (10) in the parking position (P) and / or an internal toothing (22) of the housing fixed portion (2) of the parking brake assembly (6) on one of the sliding sleeve (7) facing side is designed tapering end face.