Device for driving a cutter bar of a mower, mowing basket and method for operating a mower

Abstract

Device (1, 41, 47) for driving at least one longitudinally movable cutter bar (2, 40, 48) of a mower (38) of a mower basket (36, 46), comprising at least one hydraulic working cylinder (3, 4) that can be connected at least indirectly mechanically to the cutter bar (2, 40, 48) and a collection basket (37) of the mower basket (36, 46), characterized by at least one hydraulic motor (43), at least one eccentric (23) that is rotationally fixed to a motor shaft (22) of the hydraulic motor (43) and at least one hydraulic pump cylinder (11, 12, 13, 14) that can be actuated at least indirectly mechanically with the eccentric (23) and is hydraulically connected to the working cylinder (3, 4).

Description

Technical area

[0001] The invention relates to a device for driving at least one longitudinally movable blade bar of a mower of a mowing bucket, comprising at least one hydraulic working cylinder that is at least indirectly mechanically connected to the blade bar and to a collecting basket of the mower. Furthermore, the invention relates to a mowing bucket with at least one collecting basket, at least one mower arranged on the collecting basket, which mower has at least one longitudinally movable blade bar, and at least one device for driving the blade bar. Furthermore, the invention relates to a method for operating a mower of a mowing bucket, wherein at least one longitudinally movable blade bar of the mower is driven by means of at least one hydraulic working cylinder that is mechanically connected to the blade bar and to a collecting basket of the mowing bucket. State of the art

[0002] Mower baskets are used, for example, for clearing ditches and are available in various designs. Such a mower basket has a usually U-shaped grass catcher and a mower mounted on it. The mower is usually designed as a double-blade mower with two blade rails, with at least one of the blade rails being arranged for longitudinal movement and moving in a linear oscillation to perform a mowing operation.

[0003] DE 82 09 146 U1 discloses a drive for driving a longitudinally movable blade bar of a mower deck of a mowing basket. The drive consists of a hydraulic pump, a pressure changeover valve arranged on the grass catcher, and a synchronous cylinder arranged on the grass catcher, the piston rods of which engage the blade bar.

[0004] GB 807 223 A discloses a mower having a reciprocating cutting blade cooperating with a fixed blade and driven by a shaft of a towing vehicle by means of a hydraulic system.

[0005] CH 381 907 A discloses a hydraulic drive device for a mower. The drive device comprises a pump with two counter-rotating pistons for conveying a pressurized fluid, a valve assembly connected to the pump, and a drive unit connected to the pump and connected to the mower blade, with two counter-rotating pistons. Furthermore, the drive device comprises means connected to the valve assembly for moving the mower's cutter bar from the mowing position to a rest position and vice versa.

[0006] CH 371 292 A discloses a hydraulic drive device for the mowing blade on a mower. The drive device comprises an axial piston pump with a stationary cylinder block with two cylinders, whose pistons alternately execute a forward and reverse movement. These cylinders are connected to two cylinders, each with a piston of a drive unit. The pistons of the drive unit alternately execute forward and reverse movements in accordance with the pistons of the axial piston pump and transmit the forward movements to the mowing blade via a transmission medium. Furthermore, the drive device comprises means connected to the circulation system of the hydraulic fluid flow conveyed by the axial piston pump for interrupting the reciprocating movement of the mowing blade, as well as means for returning the hydraulic fluid from the drive unit to the pump cylinders. Disclosure of the invention

[0007] An object of the invention is to improve an operation of a mower of a mowing basket.

[0008] This object is achieved by the independent patent claims. Advantageous embodiments are recited in the dependent patent claims, the following description, and the figures, whereby these embodiments, each taken individually or in combination of at least two of these embodiments, may represent an advantageous and / or further developing aspect of the invention. Advantageous embodiments of the device may correspond to advantageous embodiments of the method, even if this is not explicitly referred to below.

[0009] A device according to the invention for driving at least one longitudinally movable blade rail of a mower of a mowing basket has at least one hydraulic working cylinder that can be connected at least indirectly mechanically to the blade rail and a collecting basket of the mowing basket, at least one hydraulic motor, at least one eccentric that is connected in a rotationally fixed manner to a motor shaft of the hydraulic motor, and at least one hydraulic pump cylinder that can be actuated at least indirectly mechanically with the eccentric and is hydraulically connected to the working cylinder.

[0010] According to the invention, the at least one working cylinder connected to the blade rail, which is longitudinally movable with respect to its longitudinal extent, is variably supplied with a hydraulic fluid, in particular a hydraulic oil, by means of the at least one pump cylinder during a mowing operation and is thereby driven. For this purpose, the pump cylinder is driven directly or indirectly mechanically by means of the eccentric, wherein preferably a piston rod connected to a piston of the pump cylinder or a piston rod forming a piston of the pump cylinder, also called a plunger piston, of the pump cylinder is driven directly or indirectly mechanically by means of the eccentric, while a cylinder tube of the pump cylinder, which accommodates the piston in an axially displaceable manner, is arranged in a stationary manner.The eccentric is in turn driven by the hydraulic motor, also called a hydromotor. When the hydraulic motor is in operation, its motor shaft rotates, driving the eccentric, which is non-rotatably connected to the motor shaft. The rotary motion of the motor shaft or eccentric is thus converted into an oscillating motion of the pump cylinder. For example, the piston rod of the pump cylinder can be pushed in, so that the hydraulic fluid displaced in a piston chamber of the pump cylinder is fed into a piston chamber of the drive cylinder, thereby extending a piston rod of the working cylinder until the piston rod of the pump cylinder reaches an axial end position.

[0011] Thus, a device according to the invention comprises only a single power transmission mechanism for transmitting force from the hydraulic motor to the working cylinder, namely the indirect or direct coupling of the eccentric and the pump cylinder, whereas the remaining power transmission takes place purely hydraulically, without the presence of a pressure switching valve according to the prior art cited above. Since the eccentric, which is provided, for example, in the form of a circular disk, also has a control contour arranged circumferentially on the eccentric with respect to a longitudinal center axis of the eccentric without contour jumps, i.e., with a continuously curved contour, the power transmission via the aforementioned power transmission mechanism is also free of jumps and thus also has a continuous curve.This means that the working cylinder as a whole is subjected to very controlled force at all times during a mowing process, whereby the working cylinder, and with it the longitudinally movable blade rail, is driven very harmoniously and not abruptly.

[0012] The hydraulic working cylinder can be mechanically connected directly or indirectly via at least one intermediate component to the longitudinally movable blade bar and / or the collecting basket of the mower basket. The working cylinder can be a single-acting or double-acting working cylinder. A longitudinal direction of the working cylinder is preferably parallel to a longitudinal direction of the longitudinally movable blade bar.

[0013] The device can also have two counter-rotating working cylinders that can be mechanically coupled to each other via a common cylinder tube. A separate piston chamber is formed in the common cylinder tube for each working cylinder, in which a piston is arranged for axial displacement. This piston is connected to its own piston rod or can be designed as a plunger piston, with the two piston chambers being separate from each other. The piston chambers are arranged coaxially. The piston rods of the two working cylinders protrude axially from the working cylinders on opposite end faces and can be mechanically connected directly or indirectly via at least one intermediate component to the longitudinally movable knife rail.To drive the two working cylinders, at least two pump cylinders are required, each hydraulically connected to one of the working cylinders. The pump cylinders are driven by the common eccentric. For this purpose, the pump cylinders must be arranged circumferentially offset from one another with respect to a longitudinal center axis of the eccentric. The two working cylinders can be arranged, for example, centrally on the blade bar or the catcher with respect to the longitudinal extent of the longitudinally movable blade bar and / or the catcher basket of the mowing basket.

[0014] The device can comprise a single hydraulic working cylinder, two working cylinders as described above with a common cylinder tube, or two structurally separate, counter-rotating working cylinders. The two separately arranged working cylinders can be arranged at axial end sections of the longitudinally movable blade bar, so that during mowing operation, the blade bar is predominantly subjected to tensile stress along its longitudinal extent by the respective working cylinder, rather than being displaced under pressure. This tensile loading of the blade bar improves the robustness of the device according to the invention compared to a pressure loading of the blade bar.To drive the two separately arranged working cylinders, at least two pump cylinders are required, each hydraulically connected to one of the working cylinders. The pump cylinders are driven by the common eccentric. For this purpose, the pump cylinders must be arranged circumferentially offset from each other with respect to a longitudinal center axis of the eccentric.

[0015] The hydraulic motor can be of conventional design and is supplied with a hydraulic fluid that drives the hydraulic motor. A rotational axis of the motor shaft of the hydraulic motor can be oriented transversely to a longitudinal center axis of the at least one pump cylinder.

[0016] The eccentric is driven by the hydraulic motor's motor shaft. To ensure a rotationally fixed connection between the eccentric and the motor shaft, the eccentric can be connected to the motor shaft via a press fit. Alternatively or additionally, the eccentric can be connected to the motor shaft by a material fit, a force fit, and / or a form fit. The eccentric can be designed as a circular eccentric disc whose longitudinal center axis is offset from the rotational axis of the hydraulic motor's motor shaft. The eccentric can be made partially or entirely of a metal, a metal alloy, a plastic, or a composite material.

[0017] The pump cylinder can be mechanically actuated by the eccentric either directly or indirectly via at least one intermediate component. The pump cylinder is hydraulically connected to the working cylinder via at least one hydraulic line. The pump cylinder can be designed as a single-acting or double-acting pump cylinder.

[0018] According to an advantageous embodiment, the device has at least one radial roller bearing arranged on the eccentric, via which the pump cylinder can be indirectly mechanically actuated with the eccentric. This reduces friction between the eccentric and the pump cylinder, making the device more durable and reliable. The radial roller bearing is arranged on the eccentric radially outwardly enclosing it with respect to the longitudinal center axis of the eccentric. The radial roller bearing can be connected to the eccentric via a press fit. Alternatively or additionally, the radial roller bearing can be connected to the eccentric in a materially bonded, non-positively bonded, and / or positively bonded manner. The radial roller bearing can be lubricated by a hydraulic fluid in the form of hydraulic oil, which is supplied to the hydraulic motor or discharged from the hydraulic motor, for example, via a leakage oil line described below.

[0019] According to a further advantageous embodiment, the radial rolling bearing is a deep groove ball bearing. This allows the radial rolling bearing to absorb axial forces in addition to radial forces, eliminating the need for additional components to absorb axial forces. The use of a deep groove ball bearing thus simplifies the design and assembly of the device.

[0020] According to a further advantageous embodiment, the device has at least two hydraulic fluid supply lines via which the hydraulic motor can be supplied with hydraulic fluid, and at least one hydraulic line hydraulically connecting the pump cylinder to the working cylinder, wherein each hydraulic fluid supply line is hydraulically connected to the hydraulic line via at least one check valve and at least one pressure control valve. This ensures that a pump cylinder-working cylinder hydraulic circuit is vented and that any system leaks do not result in a hydraulic fluid shortage, which would lead to a reduction in the stroke of the piston or piston rod of the working cylinder. For this purpose, according to this advantageous embodiment, a portion of the hydraulic fluid for driving the hydraulic motor can be used to feed the pump cylinder-working cylinder hydraulic circuit.For this purpose, the hydraulic fluid from the respective drive side, which can be freely selected, i.e. the hydraulic fluid from the respective hydraulic fluid supply line, can be passed through the check valve and then fed to the pressure control valve, in particular a two-way pressure control valve. The check function of the check valve and the fact that the inlet pressure of the hydraulic motor is always higher than the outlet pressure of the hydraulic motor, ensure that the drive sides or the hydraulic fluid supply lines are separated. The pressure on the drive side can be reduced in the pressure control valve and fed to the pump cylinder-working cylinder hydraulic circuit via the check valve. The check function of the check valve ensures that the pump cylinder-working cylinder hydraulic circuit is only supplied with hydraulic fluid when the piston orThe piston rod of the working cylinder is in its return stroke, i.e., is retracted. By supplying the hydraulic motor with hydraulic fluid via the hydraulic fluid supply lines, a rotor of the hydraulic motor, which includes the motor shaft, is set in rotation.

[0021] According to a further advantageous embodiment, the device has at least one leakage oil line hydraulically connected to the hydraulic motor, wherein the working cylinder is hydraulically connected to the leakage oil line via at least one hydraulic orifice and at least one load-holding valve. This embodiment is particularly advantageous if the device has at least two counter-rotating working cylinders and at least two counter-rotating pump cylinders that can be driven by the eccentric, i.e., if the device has at least two pump cylinder-working cylinder hydraulic circuits, and if each working cylinder is hydraulically connected to the leakage oil line via at least one dedicated hydraulic orifice and at least one dedicated load-holding valve.This advantageous embodiment allows any air contained in the respective pump cylinder-working cylinder hydraulic circuit to be discharged from this pump cylinder-working cylinder hydraulic circuit. For this purpose, the respective working cylinder is equipped with two hydraulic connections for hydraulic fluid exchange. The pump cylinder-working cylinder function of the respective pump cylinder-working cylinder hydraulic circuit takes place via one of these connections. Hydraulic fluid is fed to the respective hydraulic orifice via the other of the two connections. The hydraulic fluid flow is reduced at the respective hydraulic orifice so that only a portion of the hydraulic fluid used to stroke the piston or piston rod of the respective working cylinder is discharged. The respective load-holding valve can be connected downstream of the respective hydraulic orifice.The respective load-holding valve can be opened by the pressure within the respective pump cylinder-working cylinder hydraulic circuit, thus ensuring that a portion of the hydraulic fluid or air is drained from the pump cylinder-working cylinder hydraulic circuit and fed to the leakage oil line that is currently in the return flow. Depending on the required response times, the respective load-holding valve can also be connected upstream of the respective hydraulic orifice. Furthermore, the load-holding valves can be used to protect the pressure in the pump cylinder-working cylinder hydraulic circuits. When not actuated, the load-holding valves have a pressure-limiting function and thus discharge excessive pressure via the leakage oil line in the event of an overload in the respective pump cylinder-working cylinder hydraulic circuit.

[0022] According to a further advantageous embodiment, the device has at least one bladder accumulator hydraulically connected to the working cylinder. This allows pressure peaks in the pump cylinder-working cylinder hydraulic circuit to be dampened.

[0023] According to a further advantageous embodiment, the device comprises at least one hydraulic unit that is hydraulically connected to the hydraulic motor via the hydraulic fluid supply lines. The hydraulic unit drives the hydraulic motor via the hydraulic fluid.

[0024] A mowing basket according to the invention comprises at least one collecting basket, at least one mowing mechanism arranged on the collecting basket, which has at least one longitudinally movable blade rail, and at least one device for driving the blade rail, wherein the device is designed according to one of the above-mentioned embodiments or a combination of at least two of these embodiments.

[0025] The advantages mentioned above with regard to the device are associated with the mowing basket.

[0026] The grass catcher is essentially U-shaped or C-shaped. The mower can be designed as a double-blade mower with at least one longitudinally movable blade bar. The mower basket can be used in particular for clearing ditches, for example, water-bearing ditches. However, it goes without saying that the mower basket can also be used to clear other areas, such as embankments or verges. According to the invention, clearing is understood to mean the combined mowing of an area and the removal of the clippings from the area.

[0027] The device can be arranged partially or completely on the collecting basket. In particular, all components of the device, with the exception of the aforementioned hydraulic unit and the aforementioned bladder accumulator, can be arranged on the collecting basket. An assembly comprising the hydraulic motor, the eccentric, and the pump cylinder(s) can alternatively be arranged away from the mowing basket, for example on a boom of a commercial vehicle carrying the mowing basket, such that only the at least one working cylinder and possibly at least one hydraulic line partially connected to the working cylinder are attached to the collecting basket. This can be particularly advantageous when using the mowing basket to clear a water-bearing ditch, since the aforementioned assembly, when arranged away from the mowing basket, is not immersed in the water within the ditch.

[0028] According to an advantageous embodiment, the working cylinder engages at least indirectly with a central section of the knife rail. This embodiment can be selected in particular when the device has two counter-rotating working cylinders with a common cylinder tube, as described above. These two working cylinders are mechanically connected to one another via the longitudinally movable knife rail, so that when the piston rod of one working cylinder is extended, the piston rod of the other working cylinder is retracted. The displaced hydraulic fluid is supplied to the respective pump cylinder, which causes the piston rod of this pump cylinder to extend.

[0029] According to a further advantageous embodiment, the device comprises two counter-rotating working cylinders, with which the knife rail can be driven, and at least one pump cylinder for each working cylinder, wherein the working cylinders engage at least indirectly with axial end sections of the knife rail. The two working cylinders are mechanically connected to one another via the longitudinally movable knife rail, so that when the piston rod of one working cylinder is extended, the piston rod of the other working cylinder is retracted. The displaced hydraulic fluid is supplied to the respective pump cylinder, which allows the piston rod of this pump cylinder to extend.

[0030] According to a method according to the invention for operating a mower of a mowing basket, at least one longitudinally movable blade rail of the mower is driven by means of at least one hydraulic working cylinder mechanically connected to the blade rail and a collecting basket of the mowing basket, the working cylinder is driven by means of at least one pump cylinder, the pump cylinder is driven by means of at least one eccentric and the eccentric is driven by means of at least one hydraulic motor.

[0031] The method offers the advantages mentioned above with reference to the device. In particular, the device can be used according to one of the above-mentioned embodiments or a combination of at least two of these embodiments to carry out the method.

[0032] In the following, the invention is explained by way of example with reference to the attached figures using preferred embodiments, wherein the features explained below can represent an advantageous and / or further developing aspect of the invention both individually and in different combinations with one another. Short description of the characters Fig. 1 shows a circuit diagram of an embodiment of a device according to the invention; Fig. 2 shows a schematic representation of an embodiment of a mowing basket according to the invention in a first state; Fig. 3 shows a schematic representation of the Fig. 2 shown mowing basket in a second state; Fig. 4 shows a schematic representation of the Fig. 2 shown mowing basket in a third state; Fig. 5 shows a schematic representation of a further embodiment of a mowing basket according to the invention in a first state; Fig. 6 shows an enlarged detailed view of the Fig. 5 shown mowing basket; Fig. 7 shows an enlarged detailed view of the Fig. 5 shown mowing basket in a second state; and Fig. 8 shows an enlarged detailed view of the Fig. 5 shown mowing basket in a third state. Detailed description of the characters

[0033] In the figures, identical or functionally identical components are provided with the same reference numerals. A repeated description of such components may be omitted in detail to avoid unnecessary repetition.

[0034] Fig. Figure 1 shows a circuit diagram of an embodiment of a device 1 according to the invention for driving at least one longitudinally movable blade bar 2 of a mower (not shown) of a mowing basket (not shown). The mowing basket can, for example, be designed according to the Fig. 2 to 4 or according to the embodiment shown in the Fig. 5 to 8 shown embodiment.

[0035] The device 1 has two mechanically connected to the knife rail 2 and one in Fig. 1, the mower basket has counter-rotating hydraulic working cylinders 3 and 4 that can be connected to the collecting basket of the mowing basket (not shown), with which the blade bar 2 can be driven and thus moved in a linear oscillating manner as indicated by the double arrow 5. The working cylinders 3 and 4 engage the axial end sections of the blade bar 2.

[0036] Each working cylinder 3 or 4 has a cylinder tube 6, a piston 7 guided axially displaceably within the cylinder tube 6, and a piston rod 8 connected to the piston 7. The respective piston rod 8 is mechanically connected to a respective actuating projection 9 or 10 of the knife rail 2. Thus, the working cylinders 3 and 4 are mechanically connected to one another via the knife rail 2, so that when the piston rod 8 of the working cylinder 3 is extended, the piston rod 8 of the working cylinder 4 is retracted, and vice versa.

[0037] In addition, the device 1 has two pump cylinders 11 and 12, or 13 and 14, for each working cylinder 3 or 4, which are hydraulically connected to the respective working cylinder 3 or 4 via a hydraulic line 15 or 16. Each pump cylinder 11, 12, 13 or 14 has a cylinder tube 17, a piston 18 guided axially displaceably in the cylinder tube 17, and a piston rod 19 connected to the piston 18.

[0038] In addition, the device 1 has a Fig. 1 concealed and therefore in Fig. 1, a hydraulic motor (not shown) and two hydraulic fluid supply lines 20 and 21, via which the hydraulic motor can be supplied with hydraulic fluid in order to drive the hydraulic motor. The hydraulic fluid supply lines 20 and 21 are connected to a hydraulic unit (not shown), which can drive the hydraulic motor by applying pressure to the hydraulic fluid supply lines 20 and 21.

[0039] The device 1 also has an eccentric 23, which is non-rotatably connected to a motor shaft 22 of the hydraulic motor and is designed as a circular eccentric disk. A radial roller bearing (not shown), particularly in the form of a deep groove ball bearing, can be arranged radially on the outside of the eccentric 23. For the sake of simplicity, only the eccentric 23 will be mentioned below, which optionally also includes the design according to which the aforementioned radial roller bearing is provided.

[0040] The piston rods 19 of the pump cylinders 11 to 14 are in continuous contact with the eccentric 23, so that the pump cylinders 11 to 14 can be mechanically actuated by the eccentric 23. When the eccentric 23 is rotated, the piston rods 19 of the pump cylinder pairs formed by the pump cylinders 11 and 12 or 13 and 14 are alternately retracted and extended.

[0041] For each working cylinder 3 or 4, the device 1 has hydraulic lines 15 or 16 that hydraulically connect the two pump cylinders 11 and 12, or 13 and 14, that interact with the respective working cylinder 3 or 4, to the respective working cylinder 3 or 4. Each hydraulic fluid supply line 20 or 21 is hydraulically connected to the hydraulic lines 15 and 16 via its own check valve 24 or 25 and a common pressure control valve 26 in the form of a two-way pressure control valve.

[0042] To ensure that a pump cylinder-working cylinder hydraulic circuit formed from the respective pump cylinders 11 and 12 or 13 and 13 and the respective working cylinder 3 or 4 can be vented and that any system leaks do not result in a lack of hydraulic fluid, which could lead to a reduction in the stroke of the respective working cylinder 3 or 4, a portion of the hydraulic fluid can be used to drive the hydraulic motor to feed the respective pump cylinder-working cylinder hydraulic circuit. For this purpose, the hydraulic fluid from the respective drive side, which is freely selectable, i.e. the respective hydraulic fluid supply line 20 or 21, can be fed through the check valve 24 or 25 to the pressure control valve 26. The check function of the check valves 24 and 25 and the fact that the inlet pressure of the hydraulic motor is always higher than the outlet pressure of the hydraulic motor ensures separation of the drive sides.In the pressure control valve 26, the pressure of the respective drive side is reduced and fed to the pump cylinder-working cylinder hydraulic circuits via the check valves 24 and 25. The check function of the check valves 24 and 25 ensures that only the pump cylinder-working cylinder hydraulic circuit that is in the return stroke is supplied with hydraulic fluid.

[0043] The device 1 has a leakage oil line 27 hydraulically connected to the hydraulic motor. The respective working cylinder 3 or 4 is hydraulically connected to the leakage oil line 27 via its own hydraulic orifice 28 or 29 and its own load-holding valve 30 or 31.

[0044] To allow any air contained in the respective pump cylinder-working cylinder hydraulic circuit to escape and for fluid exchange, the working cylinders 3 and 4 are each equipped with two connections (not shown). Via a first connection of the working cylinder 3 or 4, the respective working cylinder 3 or 4 is connected to the hydraulic line 15 or 16, via which the pump cylinder-working cylinder function can take place. Via the other connection of the working cylinder 3 or 4, hydraulic fluid can be fed to the hydraulic orifice 28 or 29. At the respective hydraulic orifice 28 or 29, the hydraulic fluid flow is reduced, so that only a portion of the hydraulic fluid used to lift the working cylinder 3 or 4 is discharged. The respective load holding valve 30 or 31 is connected downstream of the respective hydraulic orifice 28 or 29. Via a hydraulic line 32 or 33 connected to the hydraulic line 15 or 16, the hydraulic fluid flow to the working cylinder 3 or 4 is reduced.33, the respective load-holding valve 30 or 31 is connected to the other pump cylinder-working cylinder hydraulic circuit. This allows the respective load-holding valve 30 or 31 to be opened by the hydraulic fluid pressure within the other pump cylinder-working cylinder hydraulic circuit, thus ensuring that the pump cylinder-working cylinder hydraulic circuit currently in the return circuit discharges a portion of the hydraulic fluid or any air it may contain via the leakage oil line 27. Furthermore, the load-holding valves 30 and 31 can be used to protect the pump cylinder-working cylinder hydraulic circuits from pressure, since the load-holding valves 30 and 31, when not activated, have a pressure-limiting function and can thus discharge excessive pressure via the leakage oil line 27 in the event of an overload in the respective pump cylinder-working cylinder hydraulic circuit.

[0045] Furthermore, the device 1 can have a separate bladder accumulator (not shown) for each pump cylinder-working cylinder hydraulic circuit, which is hydraulically connected to the respective working cylinder 3 or 4 via the respective hydraulic line 15 or 16. For this purpose, the respective bladder accumulator can be connected to the respective hydraulic line 15 or 16 via a storage line 34 or 35.

[0046] Fig. Figure 2 shows a schematic representation of an embodiment of a mowing basket 36 according to the invention in a first state. The mowing basket 36 has a collecting basket 37 and a mowing mechanism 38 arranged on the collecting basket 37, which has a blade rail 39 fixedly arranged on the collecting basket 37 and a longitudinally movable blade rail 40.

[0047] In addition, the mowing basket 36 has a device 41 for driving the longitudinally movable blade rail 40. The device 41 can be arranged in accordance with the Fig. 1. Accordingly, the device 41 has two counter-rotating working cylinders 3 and 4 acting on the axial end sections of the longitudinally movable knife rail 40, which are connected via hydraulic lines 15 and 16 to Fig. 2 not shown pump cylinders, which are housed in a structural unit 42 arranged on the collecting basket. The hydraulic motor 43 is arranged on the structural unit 42, which drives the Fig. 2 not shown, arranged within the assembly, which in turn drives the pump cylinders, as shown in Fig. 1. Furthermore, the hydraulic lines 44 and 45 are shown, via which the working cylinders 3 and 4 are connected to the Fig. 2 not shown leakage oil line and are connected to the hydraulic motor 43, wherein the hydraulic lines 44 and 45 are each connected via a Fig. 2 not shown, arranged in the assembly 42 hydraulic orifice and a Fig. 2 not shown, located in the assembly 42, are connected to the leakage oil line and the hydraulic motor 43, as shown in Fig. 1 is shown.

[0048] In the Fig. In the first state of the mowing basket 36 shown in Figure 2, the longitudinally movable blade rail 40 is in a middle position, with the two working cylinders 3 and 4 being equally extended. Also in the mowing basket 36 of Fig. 2, the working cylinders 3 and 4 are supported on actuating projections 9 and 10 of the longitudinally movable knife rail 40, wherein the actuating projections 9 and 10 are arranged in the knife plane of the longitudinally movable knife rail 40.

[0049] Fig. 3 shows a schematic representation of the Fig. 2 shown mowing basket 36 in a second state. The second state is therefore derived from the Fig. 2 shows that the working cylinder 4 has been fully extended, whereby the longitudinally movable knife rail 40 is in Fig. 3 was shifted to the right and was thereby subjected to a primarily tensile load. Since the working cylinder 3 is mechanically connected to the working cylinder 4 via the longitudinally movable knife rail 40, the working cylinder 3 was simultaneously fully retracted.

[0050] Fig. 4 shows a schematic representation of the Fig. 2 shown mowing basket 36 in a third state. The third state is therefore derived from the Fig. 3 shows that the working cylinder 3 has been fully extended, whereby the longitudinally movable knife rail 40 is in Fig. 4 was shifted to the left and was thereby subjected to a substantially tensile load. Since the working cylinder 4 is mechanically connected to the working cylinder 3 via the longitudinally movable knife rail 40, the working cylinder 4 was simultaneously fully retracted. By continuously alternating between the second state and the third state, the longitudinally movable knife rail 40 can thus be set into a linear oscillating motion.

[0051] Fig. Figure 5 shows a schematic representation of another embodiment of a mowing basket 46 according to the invention in a first state. The mowing basket 46 differs from the one shown in the Fig. 2 to 4 shown embodiment.

[0052] The device 47 differs from the one shown in the Fig. 2 to 4, the two counter-rotating working cylinders 3 and 4 are mechanically coupled to each other via a common cylinder tube 49. Each working cylinder 3 or 4 is connected to the structural unit 42 via a hydraulic line 15 or 16 and a further hydraulic line 44 or 45, as described above with reference to Fig. 2. To avoid repetition, please refer to the above description. Fig. 2.

[0053] In the Fig. In the first state of the mowing basket 46 shown in Figure 5, the longitudinally movable blade rail 48 is in a middle position, with the two working cylinders 3 and 4 being equally extended. Also in the mowing basket 46 of Fig. 5, the working cylinders 3 and 4 are supported on actuating projections 9 and 10 of the longitudinally movable knife rail 48, wherein the actuating projections 9 and 10 are arranged in the knife plane of the longitudinally movable knife rail 48 and in a central region of the knife rail 48.

[0054] Fig. 6 shows an enlarged detailed view of the Fig. 5 shown mowing basket 46. In addition, the hydraulic fluid supply lines 20 and 21 supplying the hydraulic motor 43 with hydraulic fluid are shown.

[0055] Fig. 7 shows an enlarged detailed view of the Fig. 5 shown mowing basket 46 in a second state. The second state is therefore derived from the Fig. 5 shows that the working cylinder 4 has been fully extended, whereby the longitudinally movable knife rail 48 is in Fig. 7 was shifted to the right and was subjected to partial tension and partial compression. Since working cylinder 3 is mechanically connected to working cylinder 4 via the longitudinally movable knife rail 48, working cylinder 3 was fully retracted at the same time.

[0056] Fig. 8 shows an enlarged detailed view of the Fig. 5 shown mowing basket 46 in a third state. The third state is therefore derived from the Fig. 7 shows that the working cylinder 3 has been fully extended, whereby the longitudinally movable knife rail 48 is in Fig.7 was shifted to the left and was subjected to partial tension and partial compression. Since the working cylinder 4 is mechanically connected to the working cylinder 3 via the longitudinally movable knife rail 48, the working cylinder 4 was simultaneously fully retracted. By continuously alternating between the second state and the third state, the longitudinally movable knife rail 48 can thus be set into a linear oscillating motion. List of reference symbols 1 device 2 knife rails 3 working cylinders 4 working cylinders 5 Double arrow (movement of 2) 6 cylinder tube of 3, 4 7 pistons of 3, 4 8 piston rod of 3, 4, 51, 52 9 Actuating projection of 2, 40, 48 10 actuation projection of 2, 40, 48 11 pump cylinders 12 pump cylinders 13 pump cylinders 14 pump cylinders 15 Hydraulic line 16 Hydraulic line 17 Cylinder tube of 11, 12, 13, 14 18 pistons of 11, 12, 13, 14 19 Piston rod of 11, 12, 13, 14 20 Hydraulic fluid supply line 21 Hydraulic fluid supply line 22 Motor shaft 23 eccentric 24 Check valve 25 Check valve 26 Pressure control valve 27 Leakage oil line 28 Hydraulic orifice 29 Hydraulic orifice 30 Load holding valve 31 Load holding valve 32 Hydraulic line 33 Hydraulic line 34 Hydraulic line 35 Hydraulic line 36 Mowing basket 37 Collection basket 38 Mower 39 Knife rail (stationary) 40 longitudinally movable knife rail 41 Device 42 Unit 43 Hydraulic motor 44 Hydraulic line 45 Hydraulic line 46 Mowing basket 47 Device 48 longitudinally movable knife rail 49 common cylinder barrel

Claims

[1] Device (1, 41, 47) for driving at least one longitudinally movable blade rail (2, 40, 48) of a mowing mechanism (38) of a mowing basket (36, 46), comprising at least one hydraulic working cylinder (3, 4) which can be connected at least indirectly mechanically to the blade rail (2, 40, 48) and to a collecting basket (37) of the mowing basket (36, 46), characterized by at least one hydraulic motor (43), at least one eccentric (23) connected in a rotationally fixed manner to a motor shaft (22) of the hydraulic motor (43), and at least one hydraulic pump cylinder (11, 12, 13, 14) which can be actuated at least indirectly mechanically with the eccentric (23) and is hydraulically connected to the working cylinder (3, 4). [2] Device (1, 41, 47) according to claim 1, characterized by at least one radial roller bearing arranged on the eccentric (23), via which the pump cylinder (11, 12, 13, 14) can be indirectly mechanically actuated with the eccentric (23). [3] Device (1, 41, 47) according to claim 2, characterized bythat the radial rolling bearing is a deep groove ball bearing. [4] Device (1, 41, 47) according to one of claims 1 to 3, characterized by at least two hydraulic fluid supply lines (20, 21) via which the hydraulic motor (43) can be supplied with a hydraulic fluid, and at least one hydraulic line (15, 16) hydraulically connecting the pump cylinder (11, 12, 13, 14) to the working cylinder (3, 4), wherein each hydraulic fluid supply line (20, 21) is hydraulically connected to the hydraulic line (15, 16) via at least one check valve (24, 25) and at least one pressure control valve (26). [5] Device (1, 41, 47) according to one of claims 1 to 4, characterized by at least one leakage oil line (27) hydraulically connected to the hydraulic motor (43), wherein the working cylinder (3, 4) is hydraulically connected to the leakage oil line (27) via at least one hydraulic orifice (28, 29) and at least one load-holding valve (30, 31). [6] Device (1, 41, 47) according to one of claims 1 to 5, characterized by at least one bladder accumulator which is hydraulically connected to the working cylinder (3, 4). [7] Device (1, 41, 47) according to one of claims 1 to 6, characterized by at least one hydraulic unit which is hydraulically connected to the hydraulic motor (43) via the hydraulic fluid supply lines (20, 21). [8] Mower basket (36, 46) with at least one collecting basket (37), at least one mower (38) arranged on the collecting basket (37), which has at least one longitudinally movable blade rail (2, 40, 48), and at least one device (1, 41, 47) for driving the blade rail (2, 40, 48), characterized by that the device (1, 41, 47) is designed according to one of claims 1 to 7. [9] Mowing basket (46) according to claim 8, characterized by that the working cylinder (3, 4) acts at least indirectly on a central section of the knife rail (48). [10] Mowing basket (36) according to claim 8, characterized by that the device (1, 41) has two counter-rotating working cylinders (3, 4) with which the knife rail (2, 40) can be driven, and at least one pump cylinder (11, 12, 13, 14) for each working cylinder (3, 4), wherein the working cylinders (3, 4) act at least indirectly on axial end sections of the knife rail (2, 40). [11] Method for operating a mower (38) of a mowing basket (36, 46), wherein at least one longitudinally movable blade rail (2, 40, 48) of the mower (38) is driven by means of at least one hydraulic working cylinder (3, 4) mechanically connected to the blade rail (2, 40, 48) and a collecting basket (37) of the mowing basket (36, 46), characterized by that the working cylinder (3, 4) is driven by means of at least one pump cylinder (11, 12, 13, 14) which is driven by means of at least one eccentric (23) which is driven by means of at least one hydraulic motor (43).

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