DE102022103465A1 - Construction and/or material handling machine - Google Patents

Abstract

The present invention relates to a construction and/or material handling machine such as a crane, excavator or caterpillar, with an internal combustion engine which drives one or more consumers such as a pump, winch, structural adjustment drive or working assembly drives of the construction and/or material handling machine via a mechanical drive train, with a Provided electric drive for driving the mechanical drive train and can be switched on by means of a clutch and decoupled from the mechanical drive train.

Description

The present invention relates to a construction and/or material handling machine such as a crane, excavator or caterpillar with an internal combustion engine which drives one or more consumers such as a pump, winch or hoist or signal box via a mechanical drive train. The invention also relates to a retrofittable, pre-assembled drive assembly that can be switched on if necessary, for installation in the mechanical drive train of such a construction and/or material handling machine.

Construction machines such as cranes, caterpillars or excavators usually have an internal combustion engine that drives consumers such as pumps, cable winches or hoists or signal boxes via a mechanical drive train, with the mechanical drive train being able to include a drive shaft coming from the internal combustion engine, for example in the form of a cardan shaft, which is driven on the output side is connected to the respective consumer or is connected to several consumers via one or more split transmissions and subsequent drive shafts. The consumers mentioned can include hydrostatic drives, the pump of which is driven by the mechanical drive train, in order then, for example, to actuate an actuating cylinder hydraulically. In general, the consumers that can be driven by the internal combustion engine via the mechanical drive train can generate working movements of the respective device, for example adjusting structural parts of the construction and/or material handling machine such as booms or tool arms or rotating a tower or a superstructure in general via a slewing gear, or working tools such as a load hook or a Raise and lower, swivel or otherwise operate the excavator bucket. In addition to the main working units, auxiliary units such as circulating pumps, cooling units and the like can also be driven as consumers.

If the construction machine is designed to be mobile and self-propelled, for example in the form of a mobile crane such as a telescopic crane, or a crawler or an excavator, the mechanical drive train can also be part of a travel drive that can be connected to one or more driven chassis axles, for example via a shiftable travel gear.

In order to be able to work locally emission-free on the construction site, the trend has recently been to replace the combustion engines with central electric drives, with the central electric drive being able to be connected to a supply network via a mains connection, depending on the design of the construction and/or material handling machine. which makes sense, for example, for stationary construction machines such as cranes. Alternatively or additionally, energy stores such as rechargeable batteries can also be used on board the construction machine, in order to avoid a then annoying mains connection, for example in the case of mobile construction machines.

A caterpillar with an electric drive module, for example, shows the writing DE 11 2019 003 813 T5 .

The present invention is based on the object of creating an improved construction and/or material handling machine of the type mentioned which avoids the disadvantages of the prior art and further develops the latter in an advantageous manner. In particular, efficient operation of the construction and/or material handling machine should be achieved, which can be easily adapted to different work tasks and conditions of use without requiring special preparations for the work environment, such as mains connections.

According to the invention, the stated object is achieved by a construction and/or material handling machine according to claim 1 and a retrofittable, pre-assembled electric drive assembly according to claim 16. Preferred developments of the invention are the subject matter of the dependent claims.

It is therefore proposed to provide the construction and/or material handling machine with a hybrid drive which, on the one hand, includes the internal combustion engine and, on the other hand, has a switchable electric drive. According to the invention, an electric drive is provided which can be switched on and off from the mechanical drive train by means of a clutch.

By switching on the electric drive, the mechanical drive train of the machine can be driven electrically, for example in order to be able to provide additional torque in the sense of a boost function in addition to the combustion engine. The mechanical drive train coming from the internal combustion engine and its connection to various consumers of the construction and/or material handling machine can remain unchanged, since the electric drive is coupled to the mechanical drive train and uses its further branching or connection to the consumers. Same time, by decoupling the electric drive, you can continue to work with just the combustion engine in the conventional way if the electric drive is not required or if pure combustion engine operation is more advantageous.

In an advantageous development of the invention, the electric drive, including the aforementioned clutch, forms a retrofittable, in particular pre-assembled, assembly that has shaft connections arranged coaxially with one another on opposite front ends for coaxial installation of the assembly in the drive train coming from the internal combustion engine and for connection to two coaxial drive shaft pieces of a drive shaft of the mechanical Drive train has.

In this way, the electric drive, including the clutch, can form an assembly group that can be installed in a conventional mechanical drive train that is connected to the internal combustion engine, without the drive train or the connection of the consumers to the drive train having to be modified or modified. requires a special architecture. For example, a piece on the central drive shaft that is connected to the internal combustion engine, for example a drive shaft section between two drive shafts, can be easily removed and replaced by the electric drive assembly that is inserted coaxially into the mechanical drive train coaxially with the drive shaft pieces that are themselves coaxial are arranged to each other, are installed.

In particular, the assembly mentioned, comprising the electric drive and the clutch, can be provided to form an integral part of the mechanical drive train and to transmit the drive torque coming from the internal combustion engine. In the installed state, the electric drive assembly is located in the power flow from the internal combustion engine, so that the torque generated by the internal combustion engine can be transmitted through the retrofitted assembly.

Advantageously, the electric drive can comprise a hollow-shaft electric motor, through the hollow shaft of which a drive shaft of the mechanical drive train, coupled to the internal combustion engine, can extend. The electric motor sits coaxially above the mechanical drive train and allows the drive shaft coming from the combustion engine to pass through it, so that the stator of the electric motor extends around the drive shaft and the rotor rotates around the drive shaft, in particular with a rotor axis coaxial thereto. Such a coaxial electric drive arrangement with a hollow shaft motor allows a compact design to be achieved, which also allows the electric drive to be retrofitted if the installation environment for the mechanical drive train was not specifically designed for additional drive assemblies.

In a further development of the invention, the electric motor can be connected to the mechanical drive train via at least one spur gear, with several spur gears or pairs of spur gears also being able to transmit the drive torque of the electric drive to the mechanical drive train.

Advantageously, the electric motor can be connected via a planetary gear to the mechanical drive train coming from the internal combustion engine, with the planetary gear preferably being arranged between the electric motor and the clutch, via which the electric drive can be selectively switched on and off. In particular, an output element of the planetary gear can be non-rotatably connected to the clutch which, depending on the closed state, non-rotatably connects or decouples said output element of the planetary gear to the drive shaft of the mechanical drive train.

By arranging the clutch on the output side of the planetary gear, idle running of the planetary gear or individual elements of the planetary gear can be avoided when the electric drive is not required and is switched off.

The planetary gear can have one or more planetary gear stages.

Advantageously, the planetary gear is arranged coaxially to the drive shaft of the mechanical drive train, wherein a drive shaft piece, which transmits the torque coming from the internal combustion engine, can advantageously be passed through the planetary gear in order to connect to the internal combustion engine or a drive shaft piece connected to it on one side of the planetary gear to be coupled and can be coupled on the other side of the planetary gear with the part of the mechanical drive train that leads to the consumers. In particular, the drive shaft piece that is guided axially through the planetary gear can be connected to the clutch, via which the electric drive can be switched on and off, it being possible for said drive shaft piece to be connected in a torque-proof manner to a coupling half.

Advantageously, the planetary gear can be designed in such a way that the planetary carrier—or, in the case of several planetary gear stages, also several planetary carriers—work in a stationary manner and do not rotate even when the electric drive is in operation. Various advantages can be achieved by not rotating the planet carrier or carriers. On the one hand, the planets rotatably mounted on the planet carrier do not experience any centrifugal forces, which basically allows higher speeds and has a positive effect on the meshing conditions of the gear spur gears meshing or rolling on one another. With a non-rotating planet carrier, the planets do not experience any centrifugal forces, even at high speeds. This makes it possible to dimension the bearings of the planet gears to be less massive.

On the other hand, with a non-revolving planetary carrier, there is no need for constant immersion in the oil sump, as is the case with rotating planetary carriers. As a result, improved efficiency and a correspondingly reduced generation of heat can be achieved, which also makes it possible to run at higher speeds without external cooling. The planetary gear can accordingly be designed without external cooling, in particular complex cooling measures such as a forced cooling circuit can be dispensed with.

The planetary gear can have a stationary, non-rotating ring gear, which can be fastened to the gear housing in a rotationally fixed manner or can be formed on the inner circumference.

A stationary transmission housing has - regardless of the stationary arrangement of the ring gear, which could possibly also be mounted rotatably relative to the housing - the advantage that a pressure oil or fluid supply can be provided in a simple manner via the stationary housing, in particular around the To be able to operate a clutch and / or brake in the planetary gear by pressure medium. In particular, the aforementioned clutch can be actuated hydraulically for connecting and disconnecting the electric drive to the mechanical drive train, which is facilitated by supplying pressurized oil via the stationary housing.

The planetary gear can have at least one sun gear, which can be forged or drilled or hollow in some other way, with a drive shaft section that is connected to the internal combustion engine being able to extend through the hollow sun gear. In the case of a multi-stage design, the planetary gear can also comprise a plurality of sun gears, which can be of hollow design in order to allow the drive shaft section, which is connected to the internal combustion engine, to pass through. By means of such hollow sun gears, the planetary gear can advantageously be arranged coaxially to the mechanical drive train to which the electric drive is connected via the planetary gear.

The electric motor can advantageously be connected with its output shaft in a rotationally fixed manner to a sun gear of a first planetary gear stage. Alternatively or additionally, the clutch for engaging and disengaging the electric drive can be connected to the sun gear of a last planetary gear stage in a torque-proof manner.

In order to be able to achieve high ratios or reductions with an overall simple structure, the planetary gear can comprise at least one double planetary stage, with the double planetary gears comprising two planetary gears of different diameters and/or different numbers of teeth which are connected to one another in a torque-proof manner and are mounted together on a planetary carrier each mesh with a sun gear or can thus be in rolling engagement.

In order to increase the variability of the hybrid drive, a clutch can also be provided, through which the internal combustion engine can be decoupled from or connected to the mechanical drive train. Such a coupling for coupling and uncoupling the internal combustion engine allows the mechanical drive train to be operated solely from the electric drive, or vice versa in towing operation alone to drive the electric motor and operate it as a generator in order to efficiently use batteries or accumulators for the construction or material handling machine to load. However, if high braking power is required, the internal combustion engine can also be switched on or remain switched on in order to brake the mechanical drive train together through the drag resistance of the internal combustion engine and the electric motor.

Said clutch for coupling and uncoupling the internal combustion engine can advantageously be integrated into the electric drive assembly, so that when the electric drive assembly is installed or retrofitted, the internal combustion engine can also be additionally coupled and uncoupled to the mechanical drive train. The clutch for coupling and decoupling the internal combustion engine can be arranged on an axial side of the electric motor that faces the internal combustion engine and/or on a side of the electric motor that is opposite the planetary gear described above.

In an advantageous development of the invention, between the shaft connections, which are provided on opposite axial ends of the assembly group, the clutch for coupling and uncoupling the electric drive, its electric motor and the planetary gear that may be provided or another gear, as well as the additional clutch for coupling and decoupling of the internal combustion engine.

Advantageously, the two clutches for coupling and uncoupling the electric drive and for coupling and uncoupling the internal combustion engine can be provided on opposite axial end sections of the preassembled assembly group, so that the electric motor and the transmission with the at least one spur gear can be provided axially between the two clutches.

• 1: eine schematische Seitenansicht einer Bau- und/oder Materialumschlagsmaschine in Form eines mobilen Turmdrehkrans,
• 2: eine Längsschnittansicht des mechanischen Antriebsstrangs einer Bau- und/oder Materialumschlagsmaschine von deren Verbrennungsmotor zu deren Verbrauchern, wobei in den Antriebsstrang ein zuschaltbarer und abkuppelbarer Elektroantrieb integriert ist,
• 3: eine Längsschnittansicht des Antriebsstrangs aus 1, die den Energie- bzw. Drehmomentfluss vom Elektromotor auf den mechanischen Antriebsstrang im zugeschalteten Zustand des Elektroantriebs zeigt, sodass die Antriebsleistungen des Verbrennungsmotors und des Elektroantriebs aufsummiert werden,
• 4: eine Längsschnittansicht des Antriebsstrangs aus den vorhergehenden Figuren mit zugeschaltetem Elektroantrieb, der allerdings im Schleppbetrieb als Generator betrieben wird, um einen Energiespeicher zu laden,
• 5: eine Längsschnittansicht des Antriebsstrangs aus den vorhergehenden Figuren, wobei der Verbrennungsmotor abgekuppelt ist und der Antriebsstrang alleine vom Elektroantrieb her angetrieben wird, und
• 6: eine Längsschnittansicht des Antriebsstrangs aus den vorhergehenden Figuren, wobei ähnlich 4 der Verbrennungsmotor abgekuppelt ist, jedoch der Elektroantrieb im Schleppbetrieb und der Elektromotor als Generator arbeitet, um einen Energiespeicher zu laden.

The invention is explained in more detail below using a preferred exemplary embodiment and associated drawings. In the drawings show:

• 1 : a schematic side view of a construction and/or material handling machine in the form of a mobile tower crane,
• 2 : a longitudinal sectional view of the mechanical drive train of a construction and/or material handling machine from its combustion engine to its consumers, with an electric drive that can be connected and disconnected being integrated into the drive train,
• 3 : a longitudinal sectional view of the powertrain 1 , which shows the energy or torque flow from the electric motor to the mechanical drive train when the electric drive is switched on, so that the drive power of the combustion engine and the electric drive are added up,
• 4 : a longitudinal sectional view of the drive train from the previous figures with the electric drive switched on, which, however, is operated as a generator in towing mode in order to charge an energy storage device,
• 5 : a longitudinal sectional view of the drive train from the previous figures, with the internal combustion engine being uncoupled and the drive train being driven solely by the electric drive, and
• 6 Fig. 1: a longitudinal sectional view of the drive train of the previous figures, being similar 4 the combustion engine is uncoupled, but the electric drive is in towing mode and the electric motor works as a generator to charge an energy storage device.

How 1 shows, the construction and/or material handling machine can be configured as a mobile tower crane 1 comprising a boom 3 supported by an upright tower 2 . A trolley 5 can be moved along the jib 3 projecting from the tower 2, from which a load hook 6 runs via a hoist cable and can be raised and lowered.

The tower 2 is arranged on an upper carriage 18 which is rotatably mounted on an undercarriage 16 about an upright axis and can be rotated by a slewing gear. The undercarriage 16 can have an undercarriage with at least one driven undercarriage axle in order to be able to drive the crane 1 from site to site.

How 1 shows, the crane can be folded up for this purpose in order to be able to comply with road transport dimensions, with the tower 2 being able to be telescopic and the boom 3 being able to be folded in and/or telescopic, in which case the tower 2 together with the folded-in boom 3 can be luffed down onto the superstructure .

To drive the various loads, the construction and/or material handling machine comprises an internal combustion engine 4, which drives a mechanical drive train 7, which comprises a drive shaft 8, for example in the form of a cardan shaft, which is connected to the internal combustion engine 4, optionally via a gearbox, and is driven by the Internal combustion engine 4 can be driven.

The consumers of the construction and/or material handling machine are connected to the mechanical drive train, for example in the form of pumps, winch drives or structure adjustment drives, for example the hoist for raising and lowering the load hook 6, the Slewing gear for turning the tower 2 about the vertical axis of rotation, if necessary a luffing gear for luffing the boom 3 up and down or a telescoping drive and/or folding drive for telescoping the tower 2 in and out and folding the boom 3 in and out Drive train 7 also form part of a traction drive and be coupled to at least one drivable axle of the chassis of the undercarriage 6, if necessary via a switchable transmission, in order to be able to drive the mobile construction and/or material handling machine from site to site.

As the 2 until 6 show, an electric drive 11 is integrated into the mechanical drive train 7, which connects the internal combustion engine 4 to the consumers 10a, b, c, which can be coupled to and decoupled from the mechanical drive train 7 by means of a clutch K2, so that the electric drive 11 can be switched on and is detachable.

The electric drive 11, including at least the clutch K2, forms a preassembled assembly for retrofitting an existing construction and/or material handling machine, wherein the electric drive assembly 12 can advantageously also include a further clutch K1, by means of which the internal combustion engine 4 can be uncoupled from the drive train 7 or .

Said retrofittable assembly 12 can be integrated coaxially into the mechanical drive train and advantageously have shaft connections 13a and 13b at opposite axial ends, which can be arranged coaxially to one another and can be connected coaxially to the drive shaft 8 . More precisely, the two shaft connections 13a and 13b can be connected in a torque-proof manner to a drive shaft piece 8a, which is coupled to the internal combustion engine 4, and on the other hand to a drive shaft piece 8b, which leads to the consumers 10a, b, c and to the said drive shaft pieces 8a, 8b be aligned coaxially. For example, the shaft connections 13 can include screwable shaft flanges or shaft hub connections that connect the assembly 12 to the drive shaft 8 in a torque-proof manner.

The retrofittable assembly 12 can include a drive shaft piece 8c, which can extend coaxially to the drive shaft pieces 8a and 8b and can extend axially through the electric drive 11 in order to pass the drive power of the internal combustion engine 4 through the switchable electric drive 11 and give it to the consumers can.

The electric drive 11 can include an electric motor 14 which can be designed as a hollow shaft motor in order to be able to pass the drive shaft 8 connected to the internal combustion engine 4 through it.

The electric motor 14 can transmit its drive power to the drive shaft 8 via at least one spur gear 17, the spur gear 17 being able to be coupled to the drive shaft 8 of the drive train 7 and decoupled therefrom via the clutch K2 mentioned.

In particular, the electric motor 14 of the electric drive 11 can be connected to the drive shaft 8 via a planetary gear 15, wherein said planetary gear 15 can advantageously extend between the electric motor 14 and the clutch K2. An output-side planetary gear element can be non-rotatably connected to one half of the clutch K2, the other half of which can be non-rotatably connected to the drive shaft 8, so that depending on the closed state of the clutch K2, the planetary gear 15 is decoupled from the drive shaft 8 of the drive train 7 or is coupled thereto.

As the 2 until 6 show, the planetary gear 15 can advantageously comprise a stationary, non-rotating planetary carrier 19, on which at least one set of planetary gears 20 can be mounted in a rotationally fixed manner in order to be in rolling engagement with one or more sun gears 21, 22 and optionally one or more ring gears.

As the figures show, the planet wheels 12 can be designed as double planets, in which two planet wheels can be connected to one another in a torque-proof manner and can be rotatably mounted together on the planet carrier 19, with the two planet wheels being able to have different diameters or numbers of teeth and with sun wheels 21, 22 of different sizes can be in rolling engagement.

The sun gears 21, 22 are advantageously hollow and arranged coaxially to the drive shaft 8 of the mechanical drive train 7, so that said drive shaft 8 can be passed axially through the sun gears 21, 22, cf. 2 .

One of the sun gears 21 can form the input-side drive element of the planetary gear 15, while the other sun gear 22 can form the output element of the planetary gear 15, which can be connected to the clutch K2 in a torque-proof manner.

In particular, the electric motor 14 of the electric drive 11 can be connected in a torque-proof manner to the aforementioned sun gear 22 on the input side, which drives the planetary gears 17 , which in turn drive the second sun gear 22 . When the clutch K2 is closed, the drive power is then transferred from the sun gear 22 to the drive shaft 8 .

How 2 shows, the two clutches K1 and K2 can be provided on opposite axial end sections of the retrofittable assembly 12 and/or axially enclose the electric motor 14 and the planetary gear 15 between them, with both clutches K1 and K2 being part of the preassembled assembly 12 and/or within one common module housing can be included.

How 2 shows, the electric motor 14 can be supplied with electrical energy from an energy source 25, for example a battery or an accumulator or possibly also a supply network.

How 3 shows, when the clutches K1 and K2 are closed, the drive powers of the internal combustion engine 4 and the electric drive 11 can be summed up in order to drive the output-side drive shaft section 8b together from the internal combustion engine 4 and the electric drive 11. The drive power or the torque of the internal combustion engine 4 flows axially centrally through the switched-on electric motor 14 and is transmitted via the drive shaft 8 extending axially through it. The drive torque of the electric drive 11 is applied to the drive shaft 8 via the coaxial planetary gear 15 and the clutch K2.

How 4 shows, when the clutches K1 and K2 are closed, the electric drive 11 can also be operated in towing mode, in which the electric motor 14 works as a generator and can store generated electrical energy in the energy accumulator 25 .

In another operating mode, however, the internal combustion engine 4 can also be uncoupled from the drive train 7 by opening the clutch K1, so that the electric drive 11 can work alone or drive the mechanical drive train 7 alone when the clutch K2 is closed at the same time. This can be used to reverse the drive train 8 in a simple manner or to drive it in opposite directions, since the direction of rotation of the electric motor 14 can be reversed in a simple manner.

However, in the stated operating mode of the clutches, ie with the clutch K1 open and the clutch K2 closed, the electric drive 11 can also be operated in towing mode in order to brake the drive train 7 . The electric motor 14 then working as a generator can store its provided energy in the energy store 25 .

The clutches K1 and K2 can be designed to be hydraulically actuated, it being possible for a pressurized oil supply 26 to be provided in a simple manner via the stationary transmission housing 24 .

By providing the two clutches K1 and K2 or by the switchable electric drive 11, the operating state can be adapted in various ways to a wide variety of operating conditions. The switching options are illustrated in the following table: V E K1 K2 n T P Description a out of x ◯ n _{v TV} p _v only internal combustion engine turns a a x x n _v T _V +T _E P _V +P _E Combustion engine and electric motor add up the torque a a x x n _E T _V -T _E P _V -P _E E-motor runs as a generator, is driven --) charging function out of a ◯ x n _E T _E P _E only electric motor drives, drive forward out of a ◯ x - n _E - T _E P _E only electric motor drives, drive backwards out of a ◯ x n _E - T _E - P _E only electric motor is driven from the outside, braking operation, driving forward out of a ◯ x - n _E T _E - P _E only electric motor is driven from the outside, braking operation, drive backwards

V

Verbrennungsmotor (4)

E

Elektromotor (14)

K1

Kupplung 1

K2

Kupplung 2

-

negativ

n

Drehzahl

T

Drehmoment

P

Leistung

TV

Drehmoment Verbrennungsmotor

TE

Drehmoment Elektromotor

PV

Leistung Verbrennungsmotor

PE

Leistung Elektromotor

x

Kupplung geschlossen

◯

Kupplung offen

The abbreviations used in the table above denote the following:

V

combustion engine (4)

E

electric motor (14)

K1

clutch 1

K2

clutch 2

-

negative

n

number of revolutions

T

torque

P

Performance

tv

Torque combustion engine

TE

Torque electric motor

PV

performance of the combustion engine

PE

power of the electric motor

x

clutch closed

◯

clutch open

The electric drive 11 integrated into the mechanical drive train 7, which is integrated into the power path of said drive train 7, can also have advantageous possible uses beyond construction and/or material handling machines and possibly have an aspect independently and independently of a construction and/or material handling machine of the present invention, in particular in the form of a retrofittable, preassembled assembly for installation in a mechanical drive train.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely 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

• DE 112019003813 T5 [0005]

Claims (19)

Construction and/or material handling machine such as a crane, excavator or caterpillar, with an internal combustion engine (4) which, via a mechanical drive train (7), drives one or more consumers (10a, b, c) such as a pump, winch, structural adjustment drive or work assembly drives of the construction and/or material handling machine, characterized in that an electric drive (11) is provided for driving the mechanical drive train (7) and can be connected by means of a clutch (K2) and decoupled from the mechanical drive train (7). Construction and/or material handling machine according to the preceding claim, wherein the electric drive (11) including the clutch (K2) forms a retrofittable, preassembled assembly (12) which has shaft connections (13) arranged coaxially to one another at opposite front ends for coaxial installation in the mechanical drive train (7) and for connection to two coaxial drive shaft pieces (8a, 8b) of a drive shaft (8) of the mechanical drive train (7). Construction and/or material handling machine according to one of the preceding claims, wherein a power flow of the internal combustion engine (4) via the drive train (7) is routed centrally through the electric drive (14). Construction and/or material handling machine according to one of the two preceding claims, wherein the retrofittable subassembly (12) forms an integral part of the mechanical drive train (7) and is designed to transmit the torque of the internal combustion engine (7), wherein the subassembly (12 ) comprises a drive shaft piece (8c) which is provided for the non-rotatable coupling of the two shaft connections (13) to one another and to which the electric drive (11) can be coupled by the clutch (K2). Construction and/or material handling machine according to one of the preceding claims, wherein the electric drive (11) has an electric motor (14) and at least one spur gear (17) for transmitting the drive power of the electric motor (4) to the mechanical drive train (7). Construction and/or material handling machine according to one of the preceding claims, wherein the electric drive (11) comprises a hollow shaft motor, through the hollow shaft of which extends a drive shaft (8) of the mechanical drive train (7) coupled to the internal combustion engine (4), the said hollow shaft can be rotated to the drive shaft (8) and can be coupled in a torque-transmitting manner via at least one spur gear and the clutch (K2). Construction and/or material handling machine according to one of the preceding claims, wherein a planetary gear (15) is provided for connecting the electric drive (11) to the mechanical drive train (7). Construction and/or material handling machine according to the preceding claim, wherein an output element of the planetary gear (15) is non-rotatably connected to one half of the clutch (K2) for coupling and uncoupling the electric drive (11) to/from the mechanical drive train and to a Input element is rotatably connected to the electric motor (14) of the electric drive (11). Construction and/or material handling machine according to the preceding claim, wherein said output and input elements of the planetary gear (15) are formed by sun gears of the planetary gear (15) which are arranged coaxially to the drive shaft (8) of the mechanical drive train (7). Construction and/or material handling machine according to one of the preceding Claims 7 - 9 , wherein the planetary gear (15) has a stationary, non-rotating planetary carrier (19) on which at least one set of planetary gears (20) is rotatably mounted. Construction and/or material handling machine according to one of the preceding Claims 7 - 10 , wherein the planetary gear (15) has at least one sun gear (21, 22) which is hollow and through which a drive shaft (8) of the mechanical drive train (7) for transmitting the drive power of the internal combustion engine (4) extends axially. Construction and/or material handling machine according to one of the preceding claims, in which the planetary gear (15) has double planet wheels which are connected to one another in a rotationally fixed manner and which are common are rotatably mounted on the planet carrier (18), have different diameters and/or numbers of teeth and are in rolling engagement with two separate sun gears (21, 22). Construction and/or material handling machine according to one of the preceding claims, wherein the planetary gear (15) is arranged coaxially with the mechanical drive train (7) which passes axially through the planetary gear (15). Construction and/or material handling machine according to one of the preceding claims, wherein a clutch (K2) is provided for coupling and uncoupling the internal combustion engine (4) to the mechanical drive train (7). Construction and/or material handling machine according to the preceding claim, wherein the clutch (K2) for coupling and uncoupling the internal combustion engine (4) is integrated into the retrofittable, pre-assembled assembly (12), which also includes the electric drive (11) and the clutch ( K2) for coupling and uncoupling the electric drive (11) to/from the mechanical drive train (7). Construction and/or material handling machine according to one of the preceding claims, wherein a motor housing of the electric drive (11) and/or a gear housing (24) connected thereto is designed standing, not rotating, and a pressure medium connection for supplying pressure medium for actuating the at least one clutch ( K1) has. Retrofittable, pre-assembled electric drive subassembly for installation in a mechanical drive train (7) of a construction and/or material handling machine, with a drive shaft section (8c), two coaxial shaft connections arranged at opposite axial ends of the subassembly for non-rotatably connecting the drive shaft section (8c) on two drive shaft sections (8a, 8b) of the mechanical drive train (7), an electric motor (14), at least one clutch (K2) for coupling and uncoupling the electric motor to the drive shaft section (8c) and at least one spur gear between the electric motor (14) and Coupling (K2) and/or between coupling (K2) and drive shaft section (8c). Retrofittable, pre-assembled electric drive assembly according to the preceding claim, wherein the electric motor (14) has a hollow shaft through which the drive shaft piece (8c) passes, and wherein a planetary gear (15) is provided, which as input and output elements for non-rotatable connection with the hollow shaft of the electric motor (14) and a coupling half of the coupling (K2) has two sun gears which are hollow and through which the drive shaft piece (8c) extends. Retrofittable, pre-assembled electric drive assembly according to one of the two preceding claims, wherein between the drive shaft section (8c) and one of the shaft connections (13) a clutch (K1) for releasing and closing the non-rotatable connection between the shaft connection (13) and the drive shaft section (8) is provided.

Images