CN113646552B - Driving device for groove wall cutting machine - Google Patents

Abstract

The invention relates to a drive device for a trench wall cutter (1), comprising a hydraulic motor (8), a transmission (9) which can be connected on the output side to at least one cutting wheel (3) of the trench wall cutter, and a drive shaft (12) which connects the hydraulic motor to the transmission, wherein the drive shaft is supported by at least one drive shaft bearing (25) which is arranged between the hydraulic motor and the transmission, wherein the drive shaft bearing has a lubricant inlet (14) which is connected to a leakage outlet of the hydraulic motor and/or to a hydraulic circuit for operating the hydraulic motor and is designed to lubricate the drive shaft bearing with lubricant.

Description

Drives for trench wall cutting machines

Technical field

The present invention relates to a trench wall cutting machine a drive device comprising a hydraulic motor, a transmission device connectable on the output side to at least one cutting wheel of the trench wall cutting machine, and a drive shaft connecting the hydraulic motor to the transmission device, wherein the drive shaft is provided by a hydraulic motor At least one drive shaft bearing support between the motor and transmission. The invention also relates to a trench wall cutting machine having such a drive device.

Background technique

Trench wall cutters are often used in special civil engineering works to cut trenches in the ground, rock or foundations, which are filled with suspensions containing, for example, concrete used to form trench walls. Such trench walls are usually wall structures in foundations made, for example, of concrete, reinforced concrete, etc., in order to seal, support or generally affect the foundation in a specific way. To produce such a trench wall, a substantially vertical, upwardly open trench is cut using a trench wall cutting machine, wherein the cutting tool is lowered into the ground from above and is supported on the ground by a preferably movable carrier. equipment (e.g., crawler cable excavator). Here, the trench wall cutting machine usually includes an elongated, vertical cutting frame, which is suspended vertically movably on a carrier device and which essentially carries at its lower end a plurality of cutting wheels, which can Drive in opposite directions around each horizontal axis. The drive for rotationally driving the cutting wheel can also be mounted at the lower part of the cutting frame and comprise, for example, one or more hydraulic motors, which can drive the cutting wheel via one or more transmission stages.

While the trench is continuously stabilized by the support suspension (Stützsuspension), the excavated soil material can be pumped to the surface with the help of a muck pump, so that the trench or trench walls do not collapse. After the desired depth is achieved, the trench is usually then concreted.

The distance between the hydraulic motor and the gearbox achieved by the drive shaft enables a compact construction. In particular, space problems on the support plate can be avoided if the support plate is configured narrowly in the desired manner. In particular, the hydraulic motor can be arranged above the support plate to which the cutting wheel is rotatably mounted, so that the installation depth in the area of the cutting wheel can be kept small.

However, with this spacing and arrangement of hydraulic motors, there are lubrication issues. When the main components of the transmission (especially its planet gears, sun gears and planet carriers) can be lubricated with a sump lubrication system in the area of the gearbox, in particular the drive shaft that supports the drive shaft between the hydraulic motor and the transmission The bearing is outside the gearbox or is no longer in the oil sump. area and its splash range, so lubrication of the drive shaft bearings is a challenge.

One solution here is to use continuously lubricated bearings for the drive shaft bearings. Another approach is to install a separate grease or oil lubrication system to continuously or periodically supply grease and/or oil to the driveshaft bearings and the connection between the driveshaft and motor shaft. However, both methods increase maintenance costs because the continuously lubricated bearings and the seals and threaded connections of the grease-lubricated system must be inspected and replaced regularly. Therefore, while the effective operating time of the trench wall cutting machine is correspondingly reduced, the operating cost is increased.

Furthermore, document EP 16 37 794 B1 proposes conveying transmission lubricating oil located in a groove at the bottom of the transmission upwardly through the rotating drive shaft to the drive shaft bearing. For this purpose, the drive shaft is provided with a feed thread, which, depending on the type of worm shaft, should convey lubricating oil upwards and lubricate the toothing between the drive shaft and the motor shaft. However, this solution not only has the disadvantage of increasing the manufacturing costs of the drive shaft, but also involves, first of all, the problem that lubrication of the drive shaft bearings can only be achieved if the drive shaft is running in the "correct" direction of rotation. If the direction of rotation is reversed, lubricating oil is conveyed downwards on the contrary. In addition to this, transmission lubricant only begins to flow up to the driveshaft when the transmission or driveshaft begins running, which results in a short-term lack of lubrication for the driveshaft bearings at least during startup. Here, longer downtime can worsen the lubricant supply as the lubricant settles downwards.

Contents of the invention

It is therefore an object of the present invention to provide an improved drive device for a trench wall cutting machine and an improved trench wall cutting machine which avoid the disadvantages of the prior art and further develop it in an advantageous manner. There is technology. In particular, continuous lubrication of the drive shaft bearings between the hydraulic motor and transmission will be achieved without increased maintenance work, which lubrication is functionally independent of the drive's direction of rotation and without starting problems.

It is therefore proposed not to, or at least not primarily, to lubricate the drive shaft bearings with transmission lubricating oil, but rather to use the hydraulic oil used to operate the hydraulic motor for this purpose. According to the invention, the drive shaft bearing has a lubricant inlet which supplies leakage oil from the hydraulic motor and/or hydraulic oil from the hydraulic circuit for operating the hydraulic motor to the drive shaft bearing. Thus, at least a part of the leakage oil of the hydraulic motor and/or a part of the hydraulic oil from the hydraulic circuit is conducted through the drive shaft bearings to be lubricated and/or other parts of the transmission system between the hydraulic motor and the transmission to be lubricated. components to lubricate drive bearings or other components as described.

In an advantageous development of the invention, lubrication of the drive shaft bearing and/or the connection between the drive shaft and the hydraulic motor can be achieved, for example, by omitting a shaft seal on the hydraulic motor and/or by specially provided through-motor housing The body and/or leak holes through the motor shaft intentionally cause and/or increase hydraulic motor leaks in order to direct the leaked oil to the drive shaft bearings and/or connections.

The lubricant inlet to the drive shaft bearing may include a leak collector or leak collection inlet coupled to the motor shaft of the hydraulic motor and/or where the motor shaft extends from the motor housing of the hydraulic motor. around and/or below the outlet area so that leakage oil drips or splashes into the leakage collection inlet.

Such a leakage collection inlet can be particularly advantageous if the hydraulic motor is arranged above the drive shaft and its downward motor shaft faces the drive shaft. The hydraulic motor is arranged, so to speak, upside down and positioned vertically above the drive shaft, wherein the motor shaft of the hydraulic motor can in particular be arranged coaxially with the drive shaft.

As an alternative to or in addition to the leakage supply, the lubricant inlet for the driveshaft bearings may also include a fresh oil inlet which may be connected to a part of the hydraulic circuit upstream of the hydraulic motor to remove work that has not yet been done in the hydraulic motor. Hydraulically and/or thermally pressurized or consumed fresh hydraulic oil is used for the lubrication of the drive shaft bearings. It can be said that the hydraulic oil that should flow into the hydraulic motor to drive said hydraulic motor can be diverted through this new oil inlet. Leaked oil from a hydraulic motor after work has been completed is usually hot or thermally pressurized, but new oil branching off from the hydraulic circuit upstream of the hydraulic motor usually has a significantly lower temperature. Hydraulic oils that are not inherently designed to lubricate driveshaft bearings can produce a better lubricating film at cooler temperatures, resulting in better lubrication performance. In addition, it cools the drive shaft bearings.

In a further development of the invention, the at least one drive shaft bearing may comprise a bearing sleeve or housing in which a coupling sleeve is rotatably mounted, which coupler sleeve non-rotatably connects the drive shaft to the drive shaft. Connected to the motor shaft of the hydraulic motor. The coupling sleeve and/or the drive shaft can be supported radially and/or axially on the inner circumferential surface of the bearing sleeve via rotary bearings (eg rolling bearings and/or sliding bearings), so that the housing or the The bearing sleeve rotatably supports a coupling sleeve received in the bearing sleeve and/or a drive shaft extending into the bearing sleeve.

At the same time, the bearing sleeve and/or the coupling sleeve can assume a lubricating function and/or form part of the lubricant inlet through which hydraulic oil is supplied to lubricate the drive shaft bearing and/or the drive shaft with Connector between motor shafts.

In particular, the coupling sleeve may be designed to be oil-tight towards the drive shaft, so that the internal space of the coupling sleeve forms an oil collection space, and the oil inside the coupling sleeve does not easily flow into the drive shaft. This sealing of the coupling sleeve towards the drive shaft can be achieved, for example, by molding the coupling sleeve in one piece from a homogeneous material onto the drive shaft.

However, in order to be able to detach the coupling sleeve from the drive shaft (which significantly simplifies installation and maintenance) but still achieve a sealed design, a seal can be provided between the coupling sleeve and the drive shaft so that the coupling sleeve can be removed from the drive shaft. The inner space of the coupling sleeve is sealed relative to the drive shaft.

Advantageously, the coupling sleeve can surround the motor shaft or the motor shaft head of the hydraulic motor protruding from the motor housing in a cup-like manner, so that the leakage oil that overflows at the motor shaft head flows into the coupling sleeve and It is collected here and lubricates the connection or interface between the coupling sleeve and the motor shaft or between the coupling sleeve and the drive shaft.

In a further development of the invention, the non-rotatable connection between the coupling sleeve and the motor shaft and/or between the coupling sleeve and the drive shaft can be realized by a form-locking connection, for example a splined shaft profile and /or polygonal shaped portions or otherwise designed hub connections. The lubricant inlet of the drive shaft bearing can supply hydraulic oil as lubricant, in particular leakage oil from the hydraulic motor, to the interface of the non-rotatable connection.

As an alternative or in addition to using the coupling sleeve as a lubricant distributor, the above-mentioned bearing sleeve in which the coupling sleeve is rotatably mounted can also be used as part of the lubricant inlet in order to supply hydraulic oil to the lubricating element. In particular, the bearing sleeve can be connected via an end face to the motor housing of the hydraulic motor and/or surround the motor shaft protruding therefrom.

Advantageously, the bearing sleeve can be sealed by a rotary seal towards the coupling sleeve and/or towards the drive shaft, so that the inner space of the bearing sleeve forms a collection chamber for hydraulic oil and/or is supplied to the bearing sleeve The hydraulic oil in the internal space cannot easily flow to the drive shaft.

Independently of this, the bearing sleeve can form a vertically mounted, non-rotating component.

On the one hand, the bearing sleeve can collect oil leakage that spills onto or from the motor shaft. However, independently of this, the bearing sleeve can also be used to supply hydraulic oil or fresh oil branched off upstream of the hydraulic motor to the drive shaft bearing and/or the connecting element between the drive shaft and the motor shaft.

In an advantageous development of the invention, a new oil inlet connectable to a part of the hydraulic circuit upstream of the hydraulic motor can lead to the inner space of the bearing sleeve, in particular to the space between the bearing sleeve and the coupling sleeve. space. Advantageously, the new oil inlet can pass through the wall of the bearing sleeve, so that new oil can be supplied to the inner space of the bearing sleeve through the bearing sleeve wall.

The new oil inlet can in particular pass through the edge of the bearing sleeve which is connected to the hydraulic motor, so that the new oil is conducted into the inner space of the bearing sleeve very close to the hydraulic motor.

Advantageously, leakage oil and/or new oil branching off upstream of the hydraulic motor can be conducted substantially through the entire length of the bearing sleeve and/or after being conducted through the bearing sleeve, can flow back to the valve for operating the hydraulic motor. Hydraulic circuit.

In particular, the bearing sleeve may have a hydraulic oil outlet, which may be arranged at an end section opposite the hydraulic oil inlet, in particular at an end section opposite the new oil inlet. If the new oil inlet is arranged in the above-mentioned manner on the edge of the bearing sleeve fastened to the hydraulic motor, the hydraulic oil outlet can be arranged on the opposite edge of the bearing sleeve facing away from the hydraulic motor.

In particular, the bearing sleeve may have a fresh oil inlet on the upper sleeve part and a hydraulic oil outlet on the lower bearing sleeve part.

Advantageously, the lubrication of the rolling bearings and/or sliding bearings can be achieved via the bearing sleeve, while the lubrication of the toothing or connecting surfaces for transmitting the torque of the hydraulic motor to the drive shaft is advantageously provided by the coupling sleeve.

In a modified example of the invention, an oil collection chamber can be provided below the drive shaft bearing and/or below the non-rotatable connection between the motor shaft and the drive shaft in order to collect used oil that escapes through possible leaks. Hydraulic oil for lubricating drive shaft bearings and/or non-rotatable connections. Since the oil level in the collection chamber is an indicator of tightness, it makes checking the tightness quite easy.

Advantageously, said chamber may be associated with an oil level sensor which detects the oil level of the hydraulic oil collected in the collection chamber and which may output a corresponding oil level signal.

The collection chamber may have a closable drain so that regularly collected oil can be drained off or it may also be checked whether oil leaks into the collection chamber. If no oil flows out of the collection chamber when the drain is opened, it can be inferred that there is no leak.

The collection chamber can advantageously be sealed towards the gearbox or can also be designed as open. In order to avoid leakage of hydraulic oil into the transmission and thus mixing of hydraulic oil and transmission lubricant even in the case of an open design, the collection chamber can also include a riser tube (Steigrohr) through which the drive shaft can extend The riser tube. However, alternatively or additionally, the collection chamber can also be sealed by a seal relative to the drive shaft and/or towards the transmission.

Description of drawings

The invention will be explained in more detail below based on preferred exemplary embodiments and related figures.

Figure 1 shows a schematic perspective view of a trench wall cutting machine according to an advantageous embodiment of the invention.

Figure 2 shows a perspective view of the drive device for the cutting wheel of the groove wall cutting machine of Figure 1, in which the drive motor is mounted on the upper part of the support plate and the transmission housing is arranged on the fastening diagram of the support plate 1. The lower part of the cutting wheel of the groove wall cutting machine.

Figure 3 shows a longitudinal section through the drive device for driving the cutting wheel of the groove wall cutting machine of the above figure, showing the drive shaft between the cutting wheel transmission and the hydraulic motor and the hydraulic motor and transmission The drive shaft bearing between the units and the non-rotatable connection between the drive shaft and hydraulic motor shaft.

FIG. 4 shows an enlarged longitudinal section through the drive shaft bearing and the non-rotatable connection between the drive shaft and the motor shaft.

Detailed ways

As shown in Figure 1, the trench wall cutting machine 1 may comprise an elongated, vertically arranged cutting frame 2, which may be designed as a lattice truss and/or may comprise two laterally arranged longitudinal guide profiles. At the lower end section, the cutting frame 2 may comprise at least two cutting wheels 3 which are arranged side by side and may be driven in such a manner that they can rotate about respective horizontal axes of rotation, wherein the axes of rotation of the cutting wheels 3 can be parallel to each other. and/or extending perpendicularly to the flat side of the cutting frame 2 .

Here, the cutting wheels 3 can be driven in opposite directions. The cutting drive 4 can be arranged above the cutting wheel 3 at the lower end section of the cutting frame 2 and comprise one or more drive motors 8 , for example in the form of hydraulic motors, which can be driven by a transmission or one or more gear stages ( Getriebestufe) 9 drives the cutting wheel 3.

As shown in Figure 1, the carrying device 5 can hold the cutting frame 2 with the cutting wheel 3 in a raiseable and lowerable manner, or the cutting frame can be suspended thereon. Said carrying means 5 stand upright on the ground into which corresponding grooves should be cut, and can advantageously be movable. In particular, a cable excavator having a chassis, for example in the form of a crawler chassis 6 , can be provided as the carrier device 5 , wherein the cutting frame 2 can be raised and lowered via the cantilever 7 of the carrier device 5 .

As shown in FIGS. 2 to 4 , the cutting drive 4 can be arranged on a support plate 10 or include such a support plate 10 by means of which the drive can be fastened to the cutting frame 2 . For example, the support plate 10 can be a T-shaped support, the upper part of which can be fastened to the cutting frame 2, while the lower part can carry the drive/transmission housing 11 in which the gear stage 9 is at least partially housed. In the drive/transmission housing.

The drive motor 8 may for example be fastened to the upper end of the support plate 10 and drivingly coupled to the gear stage 9 via a drive shaft 12 extendable within the support plate 10 . The drive shaft 12 is supported by at least one drive shaft bearing 13 arranged between the drive motor 8 and the gear stage 9 . The gear stage 9 may here include one or more planetary gear stages in order to drive one of the cutting wheels 3 .

As shown in FIG. 3 , the two planetary gears 9 for driving the cutting wheel 3 can be drivingly connected via a substantially vertically arranged drive shaft 12 to a hydraulic motor 8 , which can be arranged on the support plate 10 on the transmission 9 above. The motor shaft head 16 of the hydraulic motor 8 protruding from the motor housing 17 is arranged to be insertable downwards and is preferably coaxial with the drive shaft 12 . The motor shaft 16 of the hydraulic motor 8 can be arranged vertically and placed downwards.

As shown in FIG. 4 , the motor shaft 16 of the hydraulic motor 8 can be non-rotatably connected to the drive shaft 12 via a coupling sleeve 21 , wherein the coupling sleeve 21 can be mounted on the motor shaft 16 in a cup-like manner on the one hand, On the other hand, it is mounted on the drive shaft 12 in a cup-shaped manner. The non-rotatable connection between the coupling sleeve 21 and the motor shaft 16 or the coupling sleeve 21 and the drive shaft 12 can comprise, for example, a splined shaft profile, a toothing or a polygonal profile.

Advantageously, the coupling sleeve 21 can be rotatably supported by a rolling bearing 25 or alternatively or additionally by a sliding bearing on a bearing sleeve 20 which surrounds or accommodates the coupling sleeve. Barrel 21. The bearing sleeve 20 can be arranged fixedly, in particular mounted on the support plate 10 and connect or carry the hydraulic motor 8 . In particular, the bearing sleeve 20 can surround the motor shaft 16 and be connected or fastened at the end face to the motor housing 17 of the hydraulic motor 8 in order to mount the hydraulic motor 8 . The end surface of the bearing sleeve 20 can be fastened to the support plate 10 .

In order to lubricate the interface between the coupling sleeve 21 and the drive shaft 12 or between the coupling sleeve 21 and the motor shaft 16 , the inner space of the coupling sleeve 21 can form part of the lubricant inlet 14 so that the lubricant overflowing from the hydraulic motor 8 can Oil leakage and/or new oil supplied separately to the inner space of the bearing sleeve 20 is directed to said connecting surface. In particular, the internal space of the coupling sleeve 21 can form a leakage collection inlet 18, which can collect the leakage oil overflowing at the motor shaft 16 or the interface between the motor shaft 16 and the motor housing 17, and guide it to the desired location. Describe the interface. In order to conduct sufficient leakage oil to the upwardly open inner space of the coupling sleeve 21 , the shaft seal sealing the motor shaft 16 relative to the motor housing 17 can be omitted on the hydraulic motor 8 , so that by omitting the shaft seal, The leakage oil escapes at the outlet of the motor shaft 16 and enters the coupling sleeve 21 , in particular at its upwardly open end that surrounds the motor shaft 16 in a cup-like manner.

To prevent oil leakage from inadvertently escaping at the lower end of the coupling sleeve 21 , a seal 22 may be provided at the lower end or lower end section of the coupling sleeve 21 to seal the coupling sleeve 21 relative to the drive shaft 12 . The seal 22 can seal a circumferential gap provided between the drive shaft 12 and the coupling sleeve 21 , in particular adjacent to a non-rotatable profile of the drive shaft 12 or below this non-rotatable connection. in the square shaft.

In order to provide hydraulic oil not only to the lubricating points located in the coupling sleeve 21 but also to the rolling bearing 25 arranged between the coupling sleeve 21 and the bearing sleeve 20 , it is also possible to use oil from the hydraulic motor 8 on the one hand. The leakage oil that escapes can splash out from the rotating motor shaft 16 , in particular if the coupling sleeve 21 does not completely close the motor shaft 16 in such a way that it does not reach the motor housing 17 .

However, as an alternative or in addition to said oil leakage, it is also possible to supply new oil into the gap between the bearing sleeve 20 and the coupling sleeve 21 upstream of the hydraulic motor 8 from the hydraulic circuit for driving the hydraulic motor 8 Branch 15 branches out this new oil.

Advantageously, the bearing sleeve 20 may comprise a fresh oil inlet 19 which may extend through the wall of the bearing sleeve 20 directly adjacent the motor housing 17 at the upper end of the bearing sleeve 20 (see Figure 4). By supplying new oil to the internal space of the bearing sleeve 20 at the upper end section of the bearing sleeve 20 , the new oil can flow downward or drip or splash driven by gravity to lubricate the bearing 25 .

Advantageously, the lower end section of the bearing sleeve 20 can be sealed relative to the drive shaft 12 and/or relative to the coupling sleeve 21 by a rotary seal 23 , so that there is no gap between the bearing sleeve 20 and the coupling sleeve 21 or the drive shaft 12 . The annular interior is sealed downwards in order to prevent hydraulic oil from flowing into the transmission 9 and mixing there with the transmission oil.

Advantageously, said seal 22 , in particular in the form of a rotary seal for sealing the bearing sleeve 20 , can be arranged underneath all bearings 25 .

As shown in FIG. 4 , a collection chamber 24 can advantageously be provided below the bearing and coupling sleeve 20 or 21 , in particular below the seal 22 and/or the rotary seal 23 , which collection chamber is formed around the drive shaft 12 , Or the drive shaft 12 passes through the collection chamber. For example, the collection chamber 24 may be formed in the support plate 10 . Advantageously, the riser tube 26 can define a collection chamber 24 and extend around the drive shaft 12 or form a rise therein to prevent hydraulic oil collected in the collection chamber 24 from flowing down the drive shaft 12 and into the transmission 9 .

Said collection chamber 24 may have a drain opening 27 which may advantageously be provided with a removable closure 28 so that the drain opening 27 can be opened. Preferably, said drain 27 is designed so as to allow hydraulic oil, which may be located in the collection chamber 24, to drain out under gravity. For example, the drain port 27 may be located at the bottom of the collection chamber 24 and may be sloped to allow oil to drain.

By opening the closure 28, it is possible to check whether leakage occurs at the seal 22 or 23 and whether there is oil in the collection chamber 24.

Alternatively or additionally, the presence of oil in the collecting chamber 24 can also be checked via an oil level sensor system 29 , by means of which the filling level in the collecting chamber 24 can be sensed in order to emit a corresponding oil level signal, for example to provide to the machine control system. Depending on the oil fill level in the collecting chamber 24 , a maintenance signal can be issued or a maintenance process can be initiated.

Claims (18)

1. A drive device for a trench wall cutting machine, said drive device having a hydraulic motor (8) connectable on the output side to at least one cutting wheel (3) of the trench wall cutting machine (1) a transmission (9) and a drive shaft (12) connecting the hydraulic motor (8) to the transmission (9), wherein said drive shaft (12) is supported by at least one drive shaft bearing (13) arranged between said hydraulic motor (8) and said transmission (9), Characteristically, the drive shaft bearing (13) has a lubricant inlet (14) connected to the leakage outlet of the hydraulic motor (8) and designed to lubricate the drive shaft with lubricant. Bearing(13), wherein the hydraulic motor (8) is designed such that no shaft seal is present at the outlet of the motor shaft (16) in the motor housing (17), and the lubricant inlet (14) has a leakage collection inlet (18 ), the leakage collection inlet is connected around and/or below the motor shaft (16) and/or around and/or below the outlet of the motor shaft in the motor housing (17). 2. Drive device according to claim 1, wherein the lubricant inlet is connected to a hydraulic circuit (15) for operating the hydraulic motor (8). 3. Drive device according to claim 1 or 2, wherein the hydraulic motor (8) is arranged above the drive shaft (12) and the motor shaft (16) of the hydraulic motor faces downwards towards the drive shaft (12). 4. Drive device according to claim 3, wherein the motor shaft (16) is coaxially aligned with the drive shaft (12) while being vertically inverted. 5. Drive device according to claim 2, wherein the lubricant inlet (14) includes a new oil inlet (19) connected to the hydraulic circuit upstream of the hydraulic motor (8) (15) and is designed to lubricate the drive shaft bearing (13) with new hydraulic oil. 6. Drive device according to claim 1 or 2, wherein the drive shaft bearing (13) comprises a bearing sleeve (20) in which a coupling sleeve (21) is rotatably mounted. , the coupling sleeve (21) connects the drive shaft (12) to the motor shaft (16) in a non-rotatable manner. 7. Drive device according to claim 6, wherein a seal (22) for sealing the coupling sleeve (21) relative to the drive shaft (12) is provided, and/or the coupling sleeve The barrel (21) is connected to the drive shaft (12) in an oil-tight manner, so that the coupling sleeve (21) forms a hydraulic oil collection chamber. 8. Drive device according to claim 6, wherein one end face of the bearing sleeve (20) is connected to the motor housing (17) of the hydraulic motor (8), and/or the bearing A sleeve surrounds the motor shaft (16) of the hydraulic motor (8) protruding from the motor housing. 9. Drive device according to claim 5, wherein the new oil inlet (19) leads to the inner space of the bearing sleeve (20) of the drive shaft bearing (13) and passes through the bearing sleeve (20) wall. 10. Drive device according to claim 6, wherein the bearing sleeve (20) is sealed by a rotary seal (23) towards the coupling sleeve (21) and/or towards the drive shaft (12) , so that the internal space of the bearing sleeve (20) forms a hydraulic oil collection chamber. 11. Drive device according to claim 6, wherein the bearing sleeve (20) has a hydraulic oil inlet and a hydraulic oil outlet at opposite ends, through which hydraulic oil can pass. The oil outlet flushes the bearing sleeve (20). 12. Drive device according to claim 2, wherein hydraulic oil passing through the drive shaft bearing (13) is returned into the hydraulic circuit for operating the hydraulic motor (8). 13. Drive device according to claim 6, wherein the bearing sleeve (20) forms a hydraulic oil collection chamber for lubricating rolling bearings and/or sliding bearings, the drive shaft (12) and/or the The coupling sleeve (21) is rotatably supported by the rolling bearing and/or the sliding bearing. 14. Drive device according to claim 6, wherein the coupling sleeve (21) forms a hydraulic oil collection chamber for lubricating a non-rotatable connection through which the drive shaft (12) passes. A connecting piece is non-rotatably connected to the motor shaft (16) of the hydraulic motor (8). 15. The drive device according to claim 6, wherein a collection chamber (24) for collecting hydraulic oil is formed below the bearing sleeve (20) and/or the coupling sleeve (21). 16. The drive device according to claim 15, wherein the collection chamber (24) is assigned an oil level sensor for detecting the oil level in the collection chamber (24). 17. Drive device according to claim 15 or 16, wherein the collecting chamber (24) is assigned a drain opening for draining the oil collected in the collecting chamber (24), wherein the drain opening Provided with removable closure. 18. A trench wall cutting machine comprising a drive device designed according to any one of claims 1-17.