DE102019134454A1 - Modular electric drive system - Google Patents

Abstract

Axle complex (40) for a heavy vehicle with a cross element (41) which rigidly connects at least one pair of wheels (102, 103) to one another, and an electric drive module (1) which is supported by the cross element (41) in a movable manner and at least one electric motor ( 2), a first and a second drive shaft (16, 17) and a transmission (3) which is configured such that at least one electric motor (2) is connected at least to the first or the second drive shaft (16, 17). The electric drive module (1) further comprises a housing (8) which is configured such that a cavity (9) is formed, in which the electric motor (2) and the transmission (3) as well as at least a part of the first and the second Find the drive shaft (16, 17).

Description

CROSS REFERENCES TO RELATED APPLICATIONS

This registration is granted by Italian patent application No. 102018000021025 Priority one, filed on December 24, 2018, the contents of which are incorporated here by reference.

TECHNICAL PART

This invention relates to a drive system for commercial vehicles, in particular to a modular electric drive system for commercial vehicles.

STATE OF THE ART

On commercial vehicles, drive systems with an internal combustion engine are known which are usually connected to a rigid rear axle, that is to say with a cross member as the axle, which rigidly connects the two wheels and which contains the two semi-axles of the wheels connected by a differential. The rigid axle is connected to the chassis via suspensions, as in shown.

In the includes the rigid axle 1' of a vehicle 10 ' essentially an axis 2 ' , the ends of the right and left wheels 3 ' , 4 ' connects and the differential 5 ' in the known way in the middle of the axis 2 ' wearing. The axis 2 ' is with a chassis 6 ' of the vehicle 10 ' via appropriate suspensions 7 ' , 8th' associated with any typology.

A rigid axle structure 1' as in shown enables the safe transport of heavy loads while maintaining the deflection geometry of the wheels and reduces wear.

However, the rigid axle must 1' be reconfigured every time the payload on the axle and the effort change, and thus the structure of the axle 2 ' and the differential 5 ' must be reconfigured. This requirement is even clearer in the area of the electric / hybrid drive, since the arrangement of the electric drive motor must be provided, the dimensions of which vary depending on the torque.

That is why there is a need for a drive system that is as versatile as possible to use on different vehicles with different axle types, suspensions and transported loads.

There is therefore a need for a system that ensures the load capacity of the power transmission devices regardless of their performance.

The aim of this invention is to meet the requirements set out above.

SUMMARY OF THE INVENTION

This goal is achieved by an axle complex with a modular electric drive system according to the attached patent claims.

Figure list

• - zeigt eine schematische Rückansicht eines Antriebssystems mit Starrachse nach heutigem Stand der Technik;
• - zeigt eine erste Ausführung eines modularen Elektroantriebssystems;
• - zeigt eine zweite Ausführung eines modularen Antriebssystems;
• - zeigt ein Antriebssystem mit Starrachse und einem modularen Antriebssystem gemäß den und ;
• - zeigt ein Antriebssystem mit Starrachse und einem modularen Elektroantriebssystem gemäß den und ; und
• - zeigt ein Antriebssystem mit Einzelradaufhängung und einem modularen Elektroantriebssystem gemäß den und ;

For a better understanding of the present invention, the preferred application is described below, for example with reference to, but not limited to, the attached designs:

• - shows a schematic rear view of a drive system with rigid axle according to the current state of the art;
• - shows a first embodiment of a modular electric drive system;
• - shows a second embodiment of a modular drive system;
• - shows a drive system with rigid axle and a modular drive system according to the and ;
• - shows a drive system with rigid axle and a modular electric drive system according to the and ; and
• - shows a drive system with independent wheel suspension and a modular electric drive system according to the and ;

DETAILED DESCRIPTION OF THE INVENTION

In the , is a schematic of an electric drive module 1 shown. This electric drive module 1 essentially comprises at least one electric motor 2nd and a mechanical power transmission system 3rd configured to measure the mechanical speed of at least one electric motor 2nd to a semi-axis pair 4th , 5 of a vehicle 10 transmits, each semi-axle being configured to carry a wheel at its end, for example the rear wheels of a commercial vehicle as described below.

At least one electric motor is preferably located 2nd and the mechanical power transmission system 3rd in one housing 8th that is configured to have an internal cavity 9 encloses for this purpose.

In the first execution in includes the electric drive module 1 a single electric motor 2a inside the cavity 9 from the housing 8th is enclosed, which is via the mechanical power transmission system 3rd with a left semiaxis 4th and a right semiaxis 5 connected so that they can carry wheels as described above.

The electric motor 2a has sufficient dimensions for a torque to move a vehicle with a weight of 3.5 tons, so it can preferably provide a power P between 80 kW and 150 kW in order to deliver about 5000 Nm of torque to the wheels (the total of the two drive wheels ).

The power transmission system 3rd includes a first gear in the case described 11 on a drive shaft of the electric motor 2a connected to a second gear 12th on an intermediate shaft 13 is coupled. The intermediate shaft 13 also carries a second gear 14 that with a differential 15 interacts in the known form.

The differential 15 in the known form sees a pair of drive shafts 16 , 17th before, each of which driveshaft with the corresponding semi-axles 4th , 5 via a constant velocity joint 18th , 19th connected, for example via a universal joint.

In the second version in includes the electric drive module 1 a pair of electric motors 2a , 2 B each in an inner cavity 9a , 9b in the housings 8a , 8b . The housing 8a , 8b are preferably firmly connected.

The electric motors 2a , 2 B have sufficient dimensions for a torque to move a vehicle with a weight of 7 tons, so that everyone can provide a power P which is essentially that of the module in FIG resembles.

Overall, the module in So provide a power of 2 P, preferably between 160 kW and 300 kW, corresponding to about 10000 Nm torque on the wheels. Preferably, the module 1 in also include planetary gears at the output of the semi-axles or wheels in order to further increase the reduction ratio up to a maximum of 2-3 times. For example, a torque on the wheels with a higher value than 10,000 Nm is possible, so that a torque of up to 18 tons with a total of 30,000 Nm can be achieved in heavy vehicles.

So you can use electric drive modules 1 provide where the electric motor 2nd and the power transmission 3rd are configured to provide N times P power, where P is the power of a base module and N is an integer between 1 and 5.

In the example described is the mechanical power transmission system 3rd for every semi-axis 4th , 5 separated and includes a first transmission system 20a or a second gear system 20b configured to have the first and second electric motors, respectively 2a , 2 B with the semi-axis 4th , 5 connect.

In particular, the first gear system 20a a first gear 21a include that of a drive shaft of the electric motor 2a is worn and on a second gear 22a on an intermediate shaft 23a is coupled. The intermediate shaft 23a also carries a second gear 24a that on a gear 25a on a drive shaft 16 is coupled, which in turn with the left semiaxis 4th via a constant velocity joint 18th connected, for example via a universal joint

The second transmission system 20b can preferably mirror a first gear 21b on a drive shaft of the electric motor 2 B include that to a second gear 22b on an intermediate shaft 23b is coupled. The intermediate shaft 23b also carries a second gear 24b that on a gear 25b on a drive shaft 17th is coupled, which in turn with the left semiaxis 5 via a constant velocity joint 19th connected, for example via a universal joint.

The electric drive module 1 can preferably be incorporated into a rear suspension system of the vehicle as described below.

In is a vehicle 100 with a suspended chassis 101 as described below next to a rigid axle complex 30th after a first run of this system.

The rigid axle complex 30th includes a cross member 31 , essentially a rigid rod that holds a pair of wheels 102 , 103 of the vehicle 100 rigidly connected.

This cross element 31 is also movable with the chassis 101 connected to the vehicle, preferably via elastic-damping means 104 in a known form, for example in the form of leaf springs or in the form of a multi-link and coil spring system.

The electric drive module 1 is from the chassis 101 worn, preferably firmly attached to it, and the semiaxes 4th , 5 are with the wheels 102 , 103 connected in a known manner.

In is a vehicle 100 with a suspended chassis 101 as described below next to a rigid axle complex 40 to see after a second execution of this system.

The rigid axle complex 40 includes a cross member 41 that a pair of wheels 102 , 103 of the vehicle 100 rigidly connected. This cross element 41 is also movable with the chassis 101 connected to the vehicle, preferably via elastic-damping means 104 in a known form, for example in the form of leaf springs or in the form of a multi-link and coil spring system.

The cross element 41 also serves as a scaffold against the loads from the chassis 101 be exercised and at the same time the transfer to module 1 prevent. In the example shown, the intermediate cross element describes a room 42 that of two sections 41a , 41b above and below the cross element 41 axially and laterally from the end and connecting sections with the wheels 102 , 103 is limited.

The electric drive module 1 is preferably from the cross element 41 inside the cavity 42 and preferably guided movably.

The moveable connection between the housing primarily comprises 8th of the electric drive module 1 and the cross member 41 at least elastic-damping agents 43 that move the housing 8th at least vertically with the sections 41a , 41b connect.

In is a vehicle 100 with a suspended chassis 101 next to the wheels 102 , 102 as described below thanks to the independent suspension system 50 to see.

Independent suspension system 50 , a suspension of the known type 51 , 52 for each bike 102 , 103 , configured to connect the latter to the chassis 101 of the vehicle 100 . These suspensions 51 , 52 could, for example, several handlebars 53 and elastic-damping agents 54 include the corresponding wheel 102 , 103 with an accommodation element 55 preferably firmly connect to the chassis.

The electric drive module 1 is primarily on the accommodation element 55 and is preferably firmly connected to it. Ideally, the housing element comprises 55 a flange that extends from the chassis 101 extends to the ground.

The advantages of the electric drive module are based on the above 1 and the described axis complex clearly visible.

The electric drive module 1 can be used modularly on a large number of vehicles with different suspensions from the independent suspension to the rigid axle.

In particular, the electric drive module 1 Have dimensions for different vehicles / load capacities by varying the number of connected electric motors and / or the type of power transmission.

The electric drive module 1 can be carried by the axle and so the chassis 1 free from restrictions that can be used on different types of axles.

As mentioned, the electric drive module 1 can be used on various suspensions of the rigid axle or independent suspension type and thus favors savings.

Of course, you can use the electric drive module 1 and changes and deviations are made to the axle complex according to this invention, which, however, are not excluded from the scope of protection of these patent claims.

As stated, the number of electric motors and the type of power transmission can vary depending on the power that the electric drive module 1 must provide.

The electric drive module can also be used in numerous types of suspension 1 use. For example, the rigid element 41 different places or ways to carry the electric drive module 1 outside the space described by way of example in this application 42 provide.

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• IT 102018000021025 [0001]

Claims (8)

Axle complex (40) for a heavy vehicle, the axle complex (40) comprising a cross element (41) which rigidly connects at least one pair of wheels (102, 103) to one another. The axis complex (40) comprises an electric drive module (1) which is supported by the cross element (41) in a movable manner, the drive module comprises at least one electric motor (2), a first and a second drive shaft (16, 17) and a gearbox ( 3), which is configured such that at least one electric motor (2) is connected to at least one of the two drive shafts (16, 17). The electric drive module (1) further comprises a housing (8) which is configured such that a cavity (9) is formed, in which the electric motor (2) and the transmission (3) as well as at least a part of the first and the second Find the drive shaft (16, 17). Complex after Claim 1 , which further comprises a first and a second semi-axis (4, 5), the first semi-axis (4) being connected to the first drive shaft (16) via a first constant velocity joint (18) and the second semi-axis (5) being connected to the second Drive shaft (17) is connected via a second constant velocity joint (19). Complex after Claim 1 or 2nd , wherein the module comprises a single electric motor (2a) and the transmission (3) includes a differential (15) which is connected to the first and second drive shafts (16, 17). Complex after Claim 1 or 2nd , the module comprising a first electric motor (2a) and a second electric motor (2b), the transmission (3) including a first transmission system (20a) that connects the first electric motor (2a) to the first drive shaft (16), and a second gear system (20b) which connects the second electric motor (2b) to the second drive shaft (17). Complex according to one of the preceding claims, wherein the power transmission (3) comprises planetary gears. Complex according to one of the preceding claims, wherein at least one electric motor has a basic power P between 80 and 150 kW. Drive module after Claim 6 , wherein at least one electric motor (2) and the transmission (3) have sufficient dimensions to provide a module with an output of N times the basic output P, where N is a fixed integer between 2 and 5. Vehicle (100) with a rigid axle complex (40) according to one of the preceding claims.

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