Soil working roller for a soil working machine

Abstract

[0001] Eine Bodenbearbeitungswalze für eine Bodenbearbeitungsmaschine, insbesondere Bodenverdichter, umfassend einen in Richtung einer Walzendrehachse (W) sich erstreckenden, die Walzendrehachse (W) umgebenden Walzenmantel (38) und einen Walzenantrieb (42) zum Antreiben des Walzenmantels (38) zur Drehung um die Walzendrehachse (W), ist dadurch gekennzeichnet, dass der Walzenantrieb (42) einen Elektro-Walzenantriebsmotor (44) und eine Getriebeanordnung (46)umfasst, und dass ein Motor-Antriebsorgan (70) des Elektro-Walzenantriebsmotors (44) mit einem Getriebe-Eingangsorgan (82) der Getriebeanordnung (46) vermittels einer Drehzahl-Umsetzanordnung (64) zur Drehmomentübertragung gekoppelt ist.

Description

[0001] The present invention relates to a soil cultivation roller for a soil cultivation machine, in particular a soil compactor, comprising a roller shell extending in the direction of a roller rotation axis and surrounding the roller rotation axis, and a roller drive for driving the roller shell to rotate about the roller rotation axis.

[0002] In soil cultivation machines designed, for example, as soil compactors, it is known to drive one or, if applicable, several soil cultivation rollers provided on the machine to rotate around their respective axis of rotation in order to move such a machine across the soil to be cultivated. A roller drive used for this purpose can comprise a hydraulic circuit with a hydraulic pump, driven, for example, by an internal combustion engine, and a hydraulic motor coupled to the roller shell of such a soil cultivation roller.

[0003] To avoid the use of fossil fuels, there is a trend towards using electric roller drive motors in such roller drives. To move a soil cultivation machine across the ground at the desired speed, such an electric roller drive motor generally needs to be coupled with a gearbox to convert the speed of the electric roller drive motor into a speed of the soil cultivation roller suitable for moving the machine, in particular by reducing the gear ratio.

[0004] A soil cultivation roller for a soil cultivation machine according to the preamble of claim 1 is known from WO 2022 / 128151 A1.

[0005] The object of the present invention is to provide a soil cultivation roller in which a suitable rotational speed of a roller shell of the soil cultivation roller, driven to rotate by an electric roller drive motor, can be achieved with structurally simple measures.

[0006] According to the present invention, this problem is solved by a soil cultivation roller for a soil cultivation machine, in particular a soil compactor, comprising a roller shell extending in the direction of a roller rotation axis and surrounding the roller rotation axis, and a roller drive for driving the roller shell to rotate about the roller rotation axis, wherein the soil cultivation roller is characterized in that the roller drive comprises an electric roller drive motor and a gear arrangement, and that a motor drive element of the electric roller drive motor is coupled to a gear input element of the gear arrangement by means of a speed conversion arrangement for torque transmission.

[0007] By providing the speed conversion device between the electric roller drive motor and the gearbox, it is possible, on the one hand, to position the electric roller drive motor spatially decoupled from the gearbox. On the other hand, the speed conversion device provides the possibility of speed conversion upstream of the gearbox, so that the gearbox itself can be designed with a simpler structure, while the interaction of the speed conversion device with the gearbox still allows the required rotational speed of a soil cultivation roller or roller shell to be achieved for moving a soil cultivation machine.

[0008] In order to use a simple structure in the area of ​​the speed conversion arrangement, the gearbox input element can be driven by the electric roller drive motor to rotate around the roller axis of rotation, and the motor drive element can be rotated around a motor axis of rotation that is eccentric to the roller axis of rotation and essentially parallel to it.

[0009] For a compact design of the soil cultivation roller, the electric roller drive motor, the gearbox arrangement and the speed conversion arrangement can be arranged in a roller interior surrounded by the roller shell.

[0010] Since an electric roller drive motor generally has a high efficiency in a speed range that is above the speed range achievable for a soil cultivation roller, it is proposed that the speed conversion arrangement be designed for speed reduction.

[0011] The motor drive element can comprise a drive wheel of the speed conversion arrangement connected to a motor shaft of the electric roller drive motor for common rotation, and the gearbox input element can comprise an output wheel of the speed conversion arrangement connected to a gearbox input shaft of the gearbox arrangement for common rotation and coupled to the drive wheel for torque transmission.

[0012] In a design that is easy to construct and reliably operable, it can be provided that the drive wheel is designed as a drive pulley, that the driven wheel is designed as an output pulley, and that the drive pulley and the output pulley are coupled by at least one belt, preferably a toothed belt, for torque transmission.

[0013] In an alternative design, particularly when very large drive torques need to be transmitted in larger soil cultivation machines, the drive wheel can be designed as a drive gear and the driven gear as a driven gear, and the drive gear and the driven gear can: be coupled to each other by a chain for torque transmission, or be coupled to each other by at least one intermediate gear for torque transmission, or are in comb engagement with each other.

[0014] The transmission arrangement can be designed as a planetary gear, which, in order to achieve the required speed conversion, in particular reduction, can comprise at least two planetary gear stages acting in series for torque transmission.

[0015] In order to transfer the torque introduced into the gearbox assembly to the roller shell, a gearbox output element of the gearbox assembly can be connected to the roller shell for common rotation around the roller rotation axis.

[0016] According to a further aspect of the invention, which can preferably be combined with the preceding embodiment aspects, a vibration generation system with an electric unbalance drive motor and an unbalance shaft which can be driven by the electric unbalance drive motor to rotate about an unbalance shaft rotation axis can be provided in a soil cultivation roller, wherein the electric unbalance drive motor is connected to the unbalance shaft for common rotation by means of at least one cardan joint.

[0017] Depending on the design of the vibration generation system, a vibration motion can be generated on a tillage roller, i.e., a deflection essentially orthogonal to the roller's axis of rotation is produced, or an oscillation motion can be generated, i.e., a periodic back-and-forth rotational movement of the roller shell is generated, which is superimposed on the rolling motion. By providing at least one universal joint between the unbalance shaft and the electric unbalance drive motor, the electric unbalance drive motor is essentially decoupled from vibrations generated on the tillage roller or the roller shell, thus preventing any impairment of the electric unbalance drive motor's operation.

[0018] To achieve efficient radial motion decoupling, a motor shaft of the electric unbalanced drive motor can be coupled to a cardan shaft by means of a cardan joint, and the cardan shaft can be coupled to the unbalanced shaft by means of another cardan joint.

[0019] The unbalance shaft can be rotatably supported around the unbalance shaft's axis of rotation on a roller support structure connected to the roller shell, and the electric unbalance drive motor can be supported on a machine support structure rotatably supporting the roller shell around the roller's axis of rotation, i.e., a system area that does not rotate during operation.

[0020] To generate an oscillating motion or an oscillating torque acting on the roller shell to perform an oscillating motion, and oriented essentially tangentially to the roller's axis of rotation, at least two unbalanced masses rotatable about their respective unbalanced axis of rotation, which are eccentric to the unbalanced shaft's axis of rotation and essentially parallel to it, can be driven to rotate by means of the unbalanced shaft. Alternatively or additionally, to generate a vibrational motion or a vibrational force acting on the roller shell to perform a vibrational motion, and oriented essentially orthogonally to the roller's axis of rotation, an unbalanced mass rotatable with the unbalanced shaft about the unbalanced shaft's axis of rotation can be carried on the unbalanced shaft.

[0021] The axis of rotation of the unbalance shaft is advantageously essentially coaxial with the axis of rotation of the roller.

[0022] The present invention further relates to a soil cultivation machine, in particular a soil compactor, comprising at least one soil cultivation roller constructed according to the invention.

[0023] The invention is described in detail below with reference to the accompanying figures. These show: Fig. 1 a perspective longitudinal section view of a soil cultivation roller; Fig. 2 a side view of the soil cultivation roller of the Fig. 1 in direction II in Fig. 1 ; Fig. 3 one of the Fig. 2 Corresponding view with the cover housing of a speed conversion device removed; Fig. 4 one of the Fig. 2 corresponding view with transparently shown cover housing of the speed conversion assembly; Fig. 5 a longitudinal sectional view of the soil cultivation roller, cut along a line VV in Fig. 4 ; Fig. 6 a side view of a soil cultivation machine with two soil cultivation rollers.

[0024] Before proceeding with reference to the Fig. 1 bis 5 The detailed description of the construction of a soil cultivation roller is given with reference to the Fig. 6 a soil cultivation machine 10 designed as a soil compactor is described, on which, for example, such a soil cultivation roller can be used.

[0025] The soil cultivation machine 10 comprises a front machine frame 12 and a rear machine frame 14 which is articulated to the front machine frame 12 for steering the soil cultivation machine 10. An operator's platform 16 for an operator of the soil cultivation machine 10 is provided on the rear machine frame 14.

[0026] On the front machine frame 12, a soil cultivation roller 20, acting as a compaction roller in the illustrated example, is mounted by means of a machine support structure generally designated 18, around a plane of the drawing. Fig. 6 The orthogonally positioned roller rotation axis is rotatably supported. Likewise, a soil cultivation roller 24, also acting as a compaction roller, is mounted on the rear machine frame 14 by means of a machine support structure 22 around a plane of the drawing. Fig. 6 orthogonal roller axis rotatably supported.

[0027] Based on the Fig. 1 bis 5 The following section describes, by way of example, the construction of the soil cultivation roller 20 and its associated machine support structure 18. It should be noted that the soil cultivation roller 24 with the machine support structure 22 can be constructed in essentially the same way.

[0028] Especially in the Fig. 1 and 5It can be seen that the machine support structure 18 of the soil cultivation roller 20 comprises two plate-like support elements 26, 28. These can be fixed to the front machine frame 12 by means of their respective upper sections 30, 32. With their respective lower sections 34, 36 offset relative to each other in the direction of the roller's axis of rotation W, the support elements 26, 28 lie within a roller interior 40 of the soil cultivation roller 20, which is surrounded by a roller shell 38. As explained in detail below, the two support elements 26, 28 support the roller shell 38 and various system components of the soil cultivation roller 20 arranged within these sections 34, 36.

[0029] It should be noted that, for example, in a steering-guided soil cultivation machine, the two support elements 26, 28 could be fixed to a steering frame or could form a component of such a steering frame, which in the case of the soil cultivation roller 20 can then be steerable, i.e. pivotable, in a front area of ​​a machine frame which, for example, also supports the soil cultivation roller 24 in the same way.

[0030] The soil cultivation roller 20 comprises a roller drive, generally designated 42. The roller drive 42 includes an electric roller drive motor 44 and a gearbox assembly 46. A coupling disk 50 is carried on a gearbox output element 48 of the gearbox assembly 46, which is, for example, housing-like. This coupling disk 50 carries a carrier disk 54, generally also referred to as a disc, which is firmly attached to an inner side of the roller shell 40, for example, by welding, via a plurality of elastic coupling elements 52. The carrier disk 54 is thus connected to the roller output element 48, the coupling disk 50, and the carrier disk 54 for rotation about the roller axis of rotation W. The gearbox output element 48, the coupling disk 50, and the carrier disk 54 are thus connected for rotation about the roller axis of rotation W.

[0031] A non-rotating housing area 56 of the gear assembly 46 is supported on the section 34 of the support element 26 which is offset into the roller interior 40, so that in the Fig. 1 and in Fig. 5 In the area shown on the left, the soil cultivation roller 20 or its roller shell 38 is rotatably supported on the support element 26 of the machine support structure 18 about the roller rotation axis W via the gear arrangement 46.

[0032] At its other axial end region, the soil cultivation roller 20 or the roller shell 38 thereof is rotatably supported about the roller rotation axis W on the section 36 of the support element 28 of the machine support structure 18, which is offset into the roller interior 40, by means of a further support disc 58 fixed on the inside of the roller shell 38, a plurality of elastic coupling elements 60 and a coupling assembly 62 connected to these, which in the illustrated embodiment is constructed in multiple parts.

[0033] The roller drive 42 comprises a speed-conversion arrangement 64 designed for speed reduction to transmit torque between the electric roller drive motor 44 and the gear arrangement 46. The speed-conversion arrangement 64 includes a drive wheel 66, designed as a drive pulley in the illustrated embodiment, which together with a motor shaft 68 of the electric roller drive motor 44 provides a motor drive element 70.

[0034] The speed conversion arrangement 66 further comprises an output wheel 72 designed as an output pulley, which together with a transmission input shaft 80 of the transmission arrangement 46 forms a transmission input element 82.

[0035] In the illustrated embodiment, a belt 84, preferably designed as a toothed belt, is provided for torque transmission between the motor drive element 70 and the gearbox input element 82. A tensioning pulley 86 can be provided to keep this belt under tension.

[0036] This is particularly evident in the Fig. 1 and 5 The entire roller drive 42, i.e., the electric roller drive motor 44, the gear assembly 46, and the speed conversion assembly 64, is arranged within the roller interior 40, which is surrounded by the roller shell 38, so that no system components of the roller drive 42 protrude axially beyond the roller shell 38. Even a lid-like cover housing 88, which axially covers the speed conversion assembly 64 and is, for example, fixed to the support element 26, is still completely positioned within the roller interior 40 in this arrangement.

[0037] Furthermore, it can be seen that in the soil cultivation roller 20, the electric roller drive motor 44 is located laterally next to the gearbox assembly 46 with respect to the roller's axis of rotation W, thus essentially completely overlapping it axially, and, like the housing area 56 of the gearbox assembly 46, can be fixed to section 34 of the support element 26, for example, by means of screws. The motor drive element 70, i.e., the motor shaft 68 and the drive wheel 66 connected to it for common rotation, is rotatable about a motor axis of rotation M that is essentially parallel to the roller's axis of rotation W and positioned eccentrically to it. Therefore, there is a comparatively large degree of design freedom with regard to the positioning of the electric roller drive motor 44 with respect to the gearbox assembly 46, both in the axial and radial directions.

[0038] Especially in the Fig. 3 and 4It can be seen that the drive wheel 66 and the output wheel 72 have different diameters. In particular, the drive wheel 66 has a smaller diameter than the output wheel 72, so that the speed reduction assembly 64 is effective for speed reduction and thus the gearbox input element 82 rotates at a lower speed than the motor drive element 70. Therefore, a first stage of speed reduction already takes place in the torque transmission area between the electric roller drive motor 44 and the gearbox assembly 46, so that the gearbox assembly 46, which is also fundamentally designed for speed reduction, only needs to be effective for reduction to a lesser extent.For example, the gear arrangement 46 can be designed as a two-stage planetary gear in which, in two gear stages acting serially in the torque flow, the input speed, i.e. the speed of the gear input shaft 80, is successively reduced to a speed which is suitable for the operation of the soil cultivation machine 10 in a desired speed range.

[0039] It should be noted that the speed conversion arrangement 64 could be designed differently than shown. For example, the belt 84 could be a conventional V-belt, or several such belts 84 could be arranged parallel to one another with one or more appropriately designed drive wheels 66 and one or more appropriately designed driven wheels 78. In another alternative embodiment, the drive wheel 66 could be a drive gear, and the driven wheel 78 could be a driven gear. These could mesh directly with each other or mesh with one or more intermediate gears for torque transmission. Such gears could also be coupled to each other via one or more parallel chains and thus connected for torque transmission.

[0040] In a further alternative embodiment, the speed conversion arrangement 64 could be designed as a bevel gear. The drive gear 66, coupled to the motor shaft 68, and the output gear 72, coupled to the gearbox input shaft 82, are each designed as bevel gears, as is an intermediate gear acting between them or meshing with them. In this configuration, the intermediate gear is rotatable about an axis of rotation parallel to the motor axis of rotation M and the roller axis of rotation W. In each such pairing of meshing bevel gears, the two involved axes of rotation are then at an angle of approximately 90° to each other.

[0041] Even when using a bevel gear, the drive gear 66 and the output gear 72 could be directly meshed. In this configuration, they could also each be designed as a bevel gear. This design allows for greater flexibility in positioning the electric roller drive motor 44, particularly regarding the orientation of its motor axis of rotation M. This could, for example, be oriented orthogonally to the roller axis of rotation W and thus also to the axis of rotation of the gear input element 82.

[0042] The soil cultivation roller 20 further comprises a vibration generation system, generally designated 90. The vibration generation system 90 comprises an unbalance shaft 92, which is rotatably supported at one of its axial end regions with respect to the support disc 58 and at its other axial end region with respect to a further support disc 94, and is thus rotatably supported within the roller interior 40 about an unbalance shaft axis of rotation U concentric with the roller axis of rotation W. The two support discs 58, 94 thus form a roller support structure 74 for the unbalance shaft 92. Via a belt drive system, generally designated 96, two unbalance masses 98, 100, offset from each other by an angular distance of 180° about the roller axis of rotation W and the unbalance shaft axis of rotation U, respectively, are rotatably supported on the two support discs 58, 94 about their respective unbalance axes of rotation D1, D2.When the two unbalance masses 98, 100 are rotated around their respective unbalance rotation axes D 1 , D 2, they generate an oscillation torque oriented essentially tangentially to the roller rotation axis W, which causes the soil cultivation roller 20 or the roller shell 38 to periodically rotate back and forth around the roller rotation axis W.

[0043] The vibration generation system 90 further comprises an electric unbalance drive motor 102, which is supported, for example, on section 36 of the support element 28 of the machine support structure 18. A motor shaft 104 of the electric unbalance drive motor 102 is connected to the unbalance shaft 92 for common rotation by means of a cardan shaft, generally designated 106. The cardan shaft 106 comprises a shaft section 108, which is coupled at its two axial ends, respectively, to the motor shaft 104 of the electric unbalance drive motor 102 on the one hand and to the unbalance shaft 92 on the other hand, via a cardan joint 110 and 112, respectively.

[0044] Due to the use of the cardan shaft 108, radial decoupling of the electric unbalance drive motor 102 from the unbalance shaft 92 is achieved. Since the unbalance shaft 92 can, in principle, perform radial movements relative to the electric unbalance drive motor 102 due to the presence of the elastic coupling elements 52, 60, radial forces could be transmitted to the motor shaft 104 of the electric unbalance drive motor 102 without the use of the cardan shaft 108. This would also subject the rotor coupled to the motor shaft 104 to corresponding radial forces, which could impair the operating characteristics or functionality of the electric unbalance drive motor 102 due to undesired or undefined relative movements between the rotor and the stator.

[0045] It should be noted that, alternatively or additionally to the depicted generation of an oscillating torque by the vibration generation system 90, this system could also be designed to generate a vibration force or a vibrational movement. For this purpose, a further or an alternative, in Fig. 5 The unbalanced mass 76, indicated by a dashed line, is provided with a center of mass eccentric to the axis of rotation U of the unbalanced shaft, so that radially acting forces are exerted or transmitted on the roller shell 38 during the rotation of the unbalanced shaft 92 and the roller shell can be set into a vibratory motion in a manner known per se.

Claims

1. A ground processing roller for a ground processing machine, in particular a ground compactor, comprising a roller shell (38) extending in the direction of a roller rotation axis (W) and surrounding the roller rotation axis (W) and a roller drive (42) for driving the roller shell (38) to rotate about the roller rotation axis (W), wherein the roller drive (42) comprises an electric roller drive motor (44) and a gear arrangement (46), and wherein a motor drive element (70) of the electric roller drive motor (44) is coupled to a gear input element (82) of the gear arrangement (46) by means of a speed conversion arrangement (64) for torque transmission, wherein the gear input element (82) can be driven by the electric roller drive motor (44) to rotate about the roller rotation axis (W), characterized in that the motor drive element (70) is rotatable about a motor rotation axis (A) which is eccentric and is essentially parallel to the roller rotation axis (W).

2. The ground processing roller of claim 1, characterized in that the electric roller drive motor (44), the gear arrangement (46) and the speed conversion arrangement (64) are arranged in a roller interior (40) surrounded by the roller shell (38).

3. The ground processing roller of claim 1 or 2, characterized inthat the speed conversion arrangement (64) is designed for speed reduction.

4. The ground processing roller of any one of claims 1-3, characterized in that the motor drive element (70) comprises a drive wheel (66) of the speed converting arrangement (64) connected to a motor shaft (68) of the electric roller drive motor (44) for common rotation, and in that the gear input element (82) comprises a driven wheel (72) of the speed conversion arrangement (64) connected to a gear input shaft (80) of the gear arrangement (46) for common rotation and coupled to the drive wheel (66) for torque transmission.

5. The ground processing roller as claimed in claim 4, characterized in that the drive wheel (66) is designed as a drive pulley, in that the driven wheel (72) is designed as a driven pulley, and in that the drive pulley and the driven pulley are coupled by at least one belt (84), preferably toothed belt, for torque transmission.

6. The ground processing roller of claim 4, characterized in that the drive wheel (66) is designed as a drive gear, in that the driven wheel (72) is designed as a driven gear, and in that the drive gear and the driven gear: - are coupled to one another by a chain for torque transmission, or - are coupled to one another by at least one intermediate gear for torque transmission, or - are in meshing engagement with each other.

7. The ground processing roller of any one of claims 1-6, characterized inthat the gear arrangement (46) is designed as a planetary gear.

8. The ground processing roller of claim 7, characterized< / b> inthat the planetary gear comprises at least two planetary gear stages that are effective in series for torque transmission.

9. The ground processing roller of any one of claims 1-8, characterized in that a gear output element (48) of the gear arrangement (46) is connected to the roller shell (38) for common rotation about the roller rotation axis (W).

10. The ground processing roller of any one of claims 1-9, characterized in that a vibration generation system (90) is provided with an electric unbalance drive motor (102) and an unbalance shaft (92) which can be driven by the electric unbalance drive motor (102) for rotation about an unbalance shaft rotation axis (U), and in that the electric unbalance drive motor (102) is connected to the unbalance shaft (92) for common rotation by means of at least one cardan joint (110, 112).

11. The ground processing roller of claim 10, characterized in that a motor shaft (104) of the electric unbalance drive motor (102) is coupled to a cardan shaft (106) by means of a cardan joint (110) and the cardan shaft (106) is coupled to the unbalance shaft (92) by means of a further cardan joint (112).

12. The ground processing roller of claim 11, characterized in that the unbalance shaft (92) is rotatably supported about the unbalance shaft rotation axis (U) on a roller support structure (74) which is rotatably connected to the roll shell (38) about the roll rotation axis (W), and in that the electric unbalance drive motor (102) is supported on a machine support structure (18) which rotatably supports the roller shell (38) about the roller rotation axis (W).

13. The ground processing roller of claim 10, 11 or 12, characterized in that, by means of the unbalance shaft (92), at least two unbalanced masses (98, 100) which can be rotated about a respective unbalanced rotation axis (D1, D2) which is eccentric to the unbalance shaft rotation axis (U) and substantially parallel can be driven for rotation, and / or in that an unbalanced mass (76) which can be rotated with the unbalance shaft (92) about the unbalance shaft rotation axis (U) is supported on the unbalance shaft (92).

14. The ground processing roller of any one of claims 10-13, characterized in that the unbalance shaft rotation axis (U) is essentially coaxial with the roller rotation axis (W).

15. A ground processing machine, in particular a ground compactor, comprising at least one ground processing roller (20) of any one of claims 1-14.