Power device for an electrified axle

Abstract

The invention relates to a power unit for an electrically driven vehicle axle, the power unit having an electric machine (1) which drives, via a transmission (7), a drive shaft (3, 4) which extends to the wheels of the axle, the power unit having a coolant and / or lubricant module (13) which supplies the electric machine (1) and / or the transmission (7) with coolant and / or lubricant, the electric machine (1), the transmission (7) and the module (13) combining to form a structural unit in which the electric machine (1) and the coolant / lubricant module (13) are connected to the transmission (7) via flanges at an axial spacing from one another, the electric machine (1) having a radially protruding cantilever (35) on its side which is axially opposite the transmission (7), the cantilever spanning the axial spacing (Δx) from the coolant / lubricant module (13) and being attached to the coolant / lubricant module (13) at its free cantilever end (37) via at least one threaded connection (A) in a force-transmitting manner, in particular in order to reduce vibrations in the structural unit which are caused by operation. According to the invention, a stop element (49) is provided on the cantilever end (37) which can be adjusted in its stroke between a non-use position (N) and a support position (S). Before the threaded connection (A) is tightened, the stop element (49) can be adjusted in its stroke so as to abut against a module support surface (55) with an exhausted tolerance gap, so that the cantilever end (37) and the module (13) can be tightened against one another without a tolerance-induced deformation of the components.

Description

TECHNICAL FIELD

[0001] The invention relates to a power unit for an electrically operated axle of a vehicle. BACKGROUND

[0002] An electrically operated axle of a dual-track vehicle operated at least partially electrically can have an electric machine which is output via a transmission mechanism onto an output shaft which extends to the axle wheels. An oil module is furthermore provided which supplies the electric machine and / or the transmission mechanism with oil.

[0003] In power units of this type, the electric machine, the transmission mechanism and the oil module are combined into a frame-shaped, vibration-damping structural unit. In this structural unit, the electric machine and the oil module are flange-connected to the transmission mechanism at an axial spacing from one another. Furthermore, the electric machine has a radially protruding cantilever on its side which is axially opposite the transmission mechanism, which cantilever spans the axial spacing from the oil module. At its free cantilever end, the cantilever is connected to the oil module in a force-transmitting manner via a threaded connection. In this way, vibrations caused by operation in the frame-shaped structural unit can be reduced.

[0004] An oil module is known from DE 10 2004 014 787 A1. An oil pump module is known from DE 197 39 668 A1. A connection assembly which performs a tolerance compensation is known from DE 10 2017 004 778 A1. SUMMARY

[0005] It is therefore an object of the invention to provide a power unit in which assembly can be achieved in a simple manner without substantial component distortion.

[0006] The invention is based on a power unit for an electrified axle, which has an electric machine, a transmission and a coolant and / or lubricant module, which supplies the electric machine and / or the transmission with coolant and / or lubricant. The electric machine, the transmission and the module are combined into a vibration-resistant frame-shaped structural unit. In this structural unit, the electric machine and the coolant / lubricant module are connected to the transmission via flanges with an axial spacing from one another. Furthermore, the electric machine has a radially protruding cantilever on its side which is axially opposite the transmission. This cantilever spans the axial spacing from the module. The free cantilever end is attached to the module in a force-transmitting manner via at least one threaded connection site. In this way, vibrations in the structural unit caused by operation can be reduced. According to the invention, a stop element is provided at the cantilever end, which can be adjusted in its stroke between a non-use position and a support position. In the non-use position, the stop element is spaced apart from the module support surface with a tolerance gap. In this way, a module which has not yet been installed can be assembled to the structural unit without an interfering contour. Before the threaded connection site is tightened, the stop element can be adjusted in its stroke so that it comes into abutment with the module support surface with the tolerance gap exhausted. This is followed by a screwing process, in which the cantilever end and the module can be tightened to one another without component distortion caused by tolerances.

[0007] In a technical implementation, the threaded connection site can have a bolt. The bolt can pass through a bolt hole of the cantilever end and can be screwed with its screw rod into an internally threaded hole on the module side. In a space-saving implementation, the stop element can be a stop sleeve which is integrated directly in the threaded connection site. In this case, the stop sleeve can have an unthreaded inner circumference and an externally threaded outer circumference. The stop sleeve can be screwed via its external thread into the internal thread of the cantilever end. In order to implement a more compact design, it is preferred that the stop sleeve can be screwed into the internal thread in the bolt hole of the cantilever end. In order to adjust the stroke, the stop sleeve is screwed by a worker.

[0008] In a space-saving embodiment, the screw rod of the bolt can pass directly through the stop sleeve. In the support position, an end face of the stop sleeve can abut against an opening edge region of the internally threaded hole on the module side. In this case, the opening edge region of the internally threaded hole on the module side forms the module support surface, on which the stop sleeve is supported in its support position.

[0009] In the fastened state, the cantilever end together with the stop sleeve can be supported between the bolt head of the bolt and the opening edge region of the internally threaded hole on the module side. In a first variant, the bolt cap can be supported directly on the stop sleeve end face facing away from the module. Alternatively, the bolt cap can also be supported on the opening edge region of the bolt hole of the cantilever end independently of the stop sleeve.

[0010] A simple assembly operation of the stop sleeve is meaningful in terms of reducing the time of the assembly process. In this context, the stop sleeve can have a tool action on its end face facing away from the module, via which the stop sleeve can be screwed by means of a tool. In order to further simplify the assembly process, the tool action of the stop sleeve and the tool action of the screw can be embodied essentially identically. Thereby, the stop sleeve and the screw can be manipulated with the same tool.

[0011] In one technical implementation, the screw connection can be aligned parallel to the motor axis or the module axis. In order to further reduce vibrations caused by operation, the cantilever end can be connected to the module at least via a second screw connection. The screw axis of the second screw connection can be perpendicular to the screw axis of the first screw connection.

[0012] The second screw connection can have a screw which can be passed through the screw hole of the cantilever end and can engage with its screw rod in a module-side internal thread hole. By means of the second screw connection, transverse vibrations, i.e. vibrations in an axis direction transverse to the screw axis of the second screw connection, can be prevented. To this end, the screw connection can be constructed in such a way that a compensation sleeve can be inserted into the screw hole of the cantilever end with a small hole gap. The sleeve length of the compensation sleeve can be greater than the length of the screw hole of the cantilever end. Thereby, in the fastened state the compensation sleeve is supported between the screw head and the opening edge region of the module-side internal thread hole. Furthermore, the cantilever end can be adjustably supported in the axis direction in sliding contact with the outer circumference of the compensation sleeve. Due to the small gap between the compensation sleeve and the screw hole, transverse vibrations transverse to the axis direction are largely prevented.

[0013] In the assembly process, the motor is first connected with the transmission flange. Here, a sufficiently large installation clearance is formed between the cantilever end of the motor and the transmission. In a first process step, the module is introduced into this installation clearance without an interfering contour. This is followed by a second process step in which the module is fed into the assembly position in an axial direction with a feed stroke, in which the flange connection between the module and the transmission is established. In a further third process step, the cantilever end is tightened to the module at the screw connection.

[0014] The motor is also equipped with a power electronics device. This can be arranged on the upper side of the frame-shaped structural unit and across the interior space of the frame-shaped structural unit. In this case, in the cantilever additionally a contact housing / contact housing for a supply line can be integrated in a dual function. The power electronics device is electrically connected to the motor by means of the supply line. BRIEF DESCRIPTION OF DRAWINGS

[0015] Embodiments of the application are described in detail below with reference to the accompanying drawings. In which:

[0016] Figure 1 The power device of the present invention is shown in a rough schematic wireframe diagram;

[0017] Figure 2 The power unit is shown in perspective view in its assembled state;

[0018] Figure 3 and Figure 4 The threaded connection parts are shown in different operating states;

[0019] Figure 5 With Figure 3 The corresponding view shows a variation of the threaded connection.

[0020] Figure 6 This shows another threaded connection location;

[0021] Figure 7 With Figure 2 The corresponding view shows the power unit before the oil module is assembled. Detailed Implementation

[0022] Figure 1 A simplified wireframe diagram of the power unit for a dual-track vehicle axle is shown. The axle has a motor 1, which is arranged transversely and parallel to the drive shafts 3 and 4 extending to the wheels. The rotor shaft 5 of the motor 1 is connected to the two drive shafts 3 and 4 via a transmission mechanism 7. Figure 1 In this transmission mechanism 7, a double cylindrical gear stage is driven by a gear 9 on the input side of the axle differential 11. The axle differential 11 drives drive shafts 3 and 4 extending to the wheels on both sides. Furthermore, the power unit has an oil module 13, the structure of which is described below only to the extent necessary for understanding the invention. The oil module 13 has an oil tank 15, which is connected to a pressure pump 17 via a suction line. A pressure line extends from the pressure pump 17 to a branch point where it branches into supply lines 19 and 21. Oil is guided to the gear engagement position of the transmission mechanism 7 via supply line 19. From there, the oil drips and is collected in a lubricating oil sump 23. Oil is guided to the motor 1 via supply line 21, from where it also flows towards the oil sump 23. The oil collected in the oil sump 23 is returned to the oil tank 15 by means of a return pump 25.

[0023] exist Figure 2In this case, the motor 1, the transmission 7 and the oil module 13 combine to form a frame-shaped structural unit. In this structural unit, the motor 1 and the oil module 13 are mounted on the transmission 7 at an axial spacing Δx via flange connections 27, 29. The motor 1 is equipped with (indicated by dashed lines) a power electronics device 31. This power electronics device is located on the upper side of the frame-shaped structural unit and spans the interior space of the frame-shaped structural unit. The power electronics device 31 is connected to the motor 1 via a supply line, in this case a supply line 32, which runs inside the frame-shaped structural unit. Figure 2 In this case, the supply line runs inside a contact housing 33. The contact housing 33 is part of a cantilever 35, which projects radially on the side of the motor which is axially opposite the transmission 7.

[0024] It can be seen from Figure 2 that the cantilever 35 spans the axial spacing Δx from the oil module 13. The free cantilever end 37 is connected to the oil module 13 in a force-transmitting manner via a total of four threaded connection points A, B in order to reduce vibrations in the structural unit caused by operation.

[0025] It can be seen from Figure 2 that the threaded connection points are divided into two first threaded connection points A and two second threaded connection points B. The bolt axis of the first threaded connection points A is oriented in the height direction z. The bolt axis of the threaded connection points B is oriented in the axial direction of the motor 1 or the oil module 13. In Figure 2 , the oil module 13 has an axle passage 39, through which the not shown drive shafts 3, 4 extend to the respective wheel.

[0026] The structure of one of the threaded connection points A is described below with reference to Figure 3 . The threaded connection point A thus has a bolt 41. This bolt passes through a bolt hole 43 of the cantilever end 37 and engages with its shank 45 in a module-side internal thread hole 47. In addition, the threaded connection point A is equipped with a stop sleeve 49. This stop sleeve has an unthreaded inner circumference and an externally threaded outer circumference 51. The stop sleeve 49 engages via its external thread 51 in an internal thread 53 of the bolt hole 43 of the cantilever end 37. In Figure 3 , the shank 45 of the bolt 41 passes through the stop sleeve 49. By means of a screwing operation, the stop sleeve 49 can be stroke-operated between a non-use position N shown in Figure 4 and a support position S shown in Figure 3 . In the support position S shown in Figure 3 , the stop sleeve 49 abuts against an opening edge region 55 of the module-side internal thread hole 47. In Figure 3In the middle, the bolt head 57 of bolt 41 is supported on the opening edge region of bolt hole 43 of cantilever end 37. Stop sleeve 49 protrudes from bolt hole 43 of cantilever end 37 by an excess dimension Δh, which crosses the tolerance clearance Δy between cantilever end 37 and oil module 13. Figure 4 ).

[0027] The stop sleeve 49 has a tool actuation portion 61 on its end face facing away from the oil module 13, through which the stop sleeve 49 can be screwed. The tool actuation portion 61 of the stop sleeve 49 and the tool actuation portion 63 of the bolt 41 are substantially the same and are constructed as an inner polygon. Therefore, both the stop sleeve 49 and the bolt 41 can be operated with the same tool.

[0028] exist Figure 3 In the middle, the end face of the opening edge region 55 of the internal threaded hole 47 of the stop sleeve 49, which is away from the module side, is located within the bolt hole 43 of the cantilever end 37. Therefore, in Figure 3 In this configuration, the bolt head 57 of bolt 41 is directly supported on the edge region of the opening of bolt hole 43 at the cantilever end 37. Alternatively, Figure 5 The diagram shows a variation of the threaded connection portion A, in which the end face of the opening edge region 55 of the internal threaded hole 47 on the module side of the stop sleeve 49 extends beyond the cantilever end 37 by a distance a. In this case, the bolt head 57 of the bolt 41 is directly supported on the stop sleeve 49.

[0029] Figure 6 The diagram shows the structure of one of the second threaded connection portions B. Therefore, the second threaded connection portion B has a bolt 65 that passes through a bolt hole 67 in the cantilever end 37 and is threadedly engaged with an internal threaded hole 71 on the module side by means of its thread 69. A compensating sleeve 73 is inserted into the bolt hole 67 in the cantilever end 37 with a small hole clearance. The sleeve length l1 of the compensating sleeve is greater than the bolt hole length l2 of the cantilever end 37. Figure 6 The diagram shows the tightened state, in which the compensating sleeve 73 is supported between the bolt head 75 of the bolt 67 and the opening edge region 77 of the internally threaded hole 71 on the module side. In this case, the cantilever end 37 slides in contact with the outer periphery of the smooth cylindrical compensating sleeve, thereby achieving floating support in the axial direction, but vibrations transverse to the axial direction are largely prevented.

[0030] The outer and inner circumferences of the compensating sleeve 73 are both smooth cylindrical or unthreaded. Therefore, the bolt 65 passes through the compensating sleeve 73 without thread engagement.

[0031] Figure 7The structural unit shown in Fig. 1 has not yet assembled the oil module 13. This structural unit has a mounting gap f between the jib end 37 and the transmission 7. In a first process step, the oil module 13 is introduced into the mounting gap f in the assembly direction x without an interfering contour. This is followed by a second process step in which the oil module 13 is fed into the assembly position in the axial direction y with a feed stroke. In the assembly position, a flange connection 29 can be established between the oil module 13 and the transmission 7. In a final third process step, the jib end 37 is tightened to the oil module 13 at the screw connection sites A, B. Before the tightening process is carried out, the stop sleeve 49 is brought into abutment with the opening edge region 55 of the module-side internal thread bore 47 (see Fig. 1 1 ). The tightening process is carried out in such a way that the jib end 37 is brought into abutment with the stop sleeve 49. The stop sleeve 49 is thereby pressed into the module-side internal thread bore 47. The tightening process is carried out in such a way that the jib end 37 is brought into abutment with the stop sleeve 49. The stop sleeve 49 is thereby pressed into the module-side internal thread bore 47. The tightening process is carried out in such a way that the jib end 37 is brought into abutment with the stop sleeve 49. The stop sleeve 49 is thereby pressed into the module-side internal thread bore 47. Figure 3 ).

[0032] List of reference signs:

[0033] 1 electric machine

[0034] 3, 4 transmission shaft

[0035] 5 rotor shaft

[0036] 7 transmission

[0037] 9 input gear

[0038] 11 axle differential

[0039] 13 oil module

[0040] 15 oil tank

[0041] 17 pressure pump

[0042] 19, 21 supply line

[0043] 23 oil sump

[0044] 25 oil return pump

[0045] 27, 29 flange connection

[0046] 31 power electronics

[0047] 33 contact housing

[0048] 35 jib

[0049] 37 jib end

[0050] 39 shaft passage

[0051] 41 screw

[0052] 43 screw hole

[0053] 45 screw

[0054] 47 module-side internal thread bore

[0055] 49 stop sleeve

[0056] 51 external thread

[0057] 53 internal thread in bolt hole

[0058] 55 open edge region

[0059] 57 bolt head

[0060] 61, 63 tool action portion

[0061] 65 bolt

[0062] 67 bolt hole

[0063] 69 screw

[0064] 71 internally threaded hole on module side

[0065] 73 compensation sleeve

[0066] 75 bolt head

[0067] 77 open edge region

[0068] Δx axial spacing

[0069] Δh excess dimension

[0070] Δy tolerance gap

[0071] f installation gap

[0072] l1 sleeve length

[0073] l2 bolt hole length

[0074] N non-use position

[0075] S support position

[0076] A, B threaded connection

[0077] a excess distance

Claims

1. A power unit for an electrified vehicle axle, the power unit having an electric machine (1) which drives, via a transmission mechanism (7), a drive shaft (3, 4) which extends to the wheels of the vehicle axle, the power unit having a coolant and / or lubricant module (13) which supplies coolant and / or lubricant to the electric machine (1) and / or the transmission mechanism (7), wherein The motor (1), the transmission (7) and the coolant and / or lubricant module (13) are combined into a structural unit in which the motor (1) and the coolant and / or lubricant module (13) are connected to the transmission (7) via flanges with an axial spacing between them, wherein the motor (1) has a radially protruding cantilever (35) on its side which is axially opposite the transmission (7), which cantilever bridges the axial spacing (Δx) to the coolant and / or lubricant module (13) and which is connected in a force-transmitting manner to the coolant and / or lubricant module (13) via at least one first threaded connection point (A) at its free cantilever end (37), in order to reduce vibrations in the structural unit caused by operation, characterized in that a stop element is provided on the cantilever end (37) which can be adjusted in its stroke between a non-use position (N) and a support position (S), the stop element being spaced apart from the coolant and / or lubricant module support surface (55) in the non-use position (N) with a tolerance gap which is left free, the stop element being able to be adjusted in its stroke before the first threaded connection point (A) is tightened in order to abut against the coolant and / or lubricant module support surface (55) with the tolerance gap exhausted, in order to enable the cantilever end (37) and the coolant and / or lubricant module (13) to be tightened against one another without component distortion caused by tolerances.

2. The power plant of claim 1, wherein The first threaded connection point (A) has a bolt (41) which can be passed through a bolt hole (43) of the cantilever end (37), the shank (45) of which can be screwed into a female threaded hole (47) on the side of the coolant and / or lubricant module.

3. The power plant of claim 2, wherein, The stop element is a stop sleeve, the inner circumference of which is not threaded and the outer circumference of which has an outer thread (51) via which the stop sleeve (49) is screwed into an inner thread (53) of the cantilever end (37), which is configured in the bolt hole (43) of the cantilever end (37), and / or the stop sleeve (49) can be screwed for adjustment of the stroke.

4. The power plant of claim 3, wherein The shank (45) of the bolt (41) can be passed through the stop sleeve (49); and / or, in the support position (S), an end face of the stop sleeve (49) abuts against an opening edge region of the female threaded hole (47) of the coolant and / or lubricant module (13), which forms the coolant and / or lubricant module support surface.

5. The power plant according to claim 3 or 4, characterized in that In the fastened state, the cantilever end (37) together with the stop sleeve (49) is supported between a bolt head (57) of the bolt (41) and an opening edge region of the female threaded hole (47) of the coolant and / or lubricant module (13), the bolt head (57) being supported directly on the stop sleeve end face which faces away from the coolant and / or lubricant module (13), or the bolt head (57) being supported independently of the stop sleeve (49) on an opening edge region of the bolt hole (43) of the cantilever end (37).

6. The power plant according to claim 3 or 4, characterized in that The stop sleeve (49) has a tool engagement portion (61) on an end face thereof facing away from the coolant and / or lubricant module (13), via which the stop sleeve (49) can be screw-operated, the tool engagement portion (61) of the stop sleeve (49) and the tool engagement portion (63) of the bolt (41) being essentially identical, such that the stop sleeve (49) and the bolt (41) can be operated with the same tool.

7. The power plant according to claim 1 or 2, characterized by The first screw connection (A) is parallel to the motor axis or the coolant and / or lubricant module axis, and / or, in order to further reduce vibrations caused by operation, the cantilever end (37) can be connected to the coolant and / or lubricant module (13) via at least one second screw connection (B), the bolt axis of which is perpendicular to the bolt axis of the first screw connection (A).

8. The power plant of claim 7, wherein, The second screw connection (B) has a second bolt (65) which can be passed through a second bolt hole (67) of the cantilever end (37), the shank (69) of which can be screwed into a second internally threaded hole (71) on the coolant and / or lubricant module side.

9. The power plant of claim 8, wherein, In the second bolt hole (67) of the cantilever end (37), a compensation sleeve is inserted with a small hole clearance, the sleeve length (l1) of which is greater than the length (l2) of the second bolt hole of the cantilever end (37), in the fastened state the compensation sleeve (73) being supported between the bolt head (75) of the second bolt and the opening edge region (77) of the second internally threaded hole (71) on the coolant and / or lubricant module side, the cantilever end (37) being adjustable in the axial direction in sliding contact with the compensation sleeve outer periphery, but transverse vibrations being prevented.

10. The power plant of claim 7, wherein, With the coolant and / or lubricant module (13) not yet assembled, the structural unit has a mounting clearance (f) between the cantilever end (37) and the transmission (7), in a first process step the coolant and / or lubricant module (13) being able to be introduced into the mounting clearance (f) without interference contours, in a second process step the coolant and / or lubricant module (13) being able to be fed into an assembly position in the axial direction with a feed stroke, in which assembly position a flange connection (29) between the coolant and / or lubricant module (13) and the transmission (7) can be established, in a third process step the cantilever end (37) being able to be tightened to the coolant and / or lubricant module (13) at the first screw connection (A) and the second screw connection (B).

11. The power plant according to claim 1 or 2, characterized by The motor (1) is provided with a power electronics device (31), which is arranged on the upper side of the frame-shaped structural unit, the cantilever (35) having a contact housing (33) for a power supply line, via which the power electronics device (31) can be connected to the motor (1).

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