Attachment tool setup

Abstract

Attachment tool device, in particular an attachment compactor, which can be coupled to a carrier device, in particular an excavator, the attachment tool device having a longitudinal direction (12) and a transverse direction (14), comprising a housing with a housing base frame (16) and a housing upper part (26) which are elastically movably connected via connecting means (18) spaced apart at least in the transverse direction (14), the connecting means each having at least one outer side surface (21) with respect to the housing, and the connecting means (18) being connected to the housing upper part (26) with one side surface (23) and to the housing base frame (16) with one side surface (21), and with an attachment tool (24), in particular a compactor plate, wherein an anti-vibration generator (22) is provided in the housing base frame (16) to set the attachment tool (24) into vibration,wherein the imbalance generator (22) comprises an eccentrically rotating mass (41) with a center of mass, which is driven by a drive (20) arranged in the housing base frame (16), wherein the eccentrically rotating mass (41) is geometrically designed such that its center of mass S2 is arranged centrally in the transverse direction (14) of the attachment device (10) between the connecting devices (18) spaced apart in the transverse direction (14), and its center of mass S2 coincides with the center of mass S1 of the attachment device (10) in the transverse direction, characterized in that the eccentrically rotating mass (41) has a first leg (44) extending radially to the axis of rotation (20) of the imbalance generator (22) and a second leg (46) extending parallel to the drive shaft (30) of the imbalance generator (22) or has a shape,in which the mass (41) extends in the direction of the drive (20) and does not merely have a radially extending shape, but comprises a portion extending parallel or at an angle other than 90° to the axis of rotation.,

Description

[0001] The invention relates to an attachment tool device according to the preamble of claim 1.

[0002] Such attachment devices are, in particular, attachment compactors that can be coupled to a carrier device, in particular an excavator. The attachment device has a longitudinal direction and a transverse direction, comprising a housing with a housing base frame and a housing upper part, which are elastically movably connected via connecting devices. The connecting devices each have at least one outer side surface with respect to the housing, and the connecting devices are connected by one side surface to the housing upper part and by one side surface to the housing base frame. The attachment device comprises an attachment tool, in particular a compactor plate. An imbalance generator is provided in the housing base frame to cause the attachment tool to vibrate. The imbalance generator comprises an eccentrically rotating mass with a center of mass, which is driven by a drive arranged in the housing base frame.

[0003] For example, DE 20 2005 006 059 U1 discloses an attachment device in the form of an attachment compactor, which is used as an excavator accessory, particularly in trench and pipeline construction. When used with quick-change devices and rotating heads, this cost-effective interchangeable device offers significant potential for cost savings and increased occupational safety, as it eliminates the need for people to be present in trenches and pits for compaction work. Such an attachment has become established in recent years.

[0004] Further attachment tool devices are known, for example, from DE 10 2008 006 211 B4, which originates from the applicant. Various interchangeable attachment tools can be coupled to such attachment tool devices depending on the intended use.

[0005] DE 10 2018 110 465 A1, which also originates from the applicant, also relates to an interchangeable adapter design of an add-on compressor which has a safety device in the form of a catch hook so that falling and thus the risk of injury can be reduced if the locking device has not locked the compressor plate to the housing as intended.

[0006] Furthermore, a rotary compressor is known from DE 10 2019 107 475 A1, for example, in which the lower housing section comprises a housing base frame, which is essentially formed as a single piece cast part. This design allows the drive motor and the imbalance generator to be arranged closer to the compressor plate.

[0007] A soil compactor is also described in DE 295 00 811 U1, in which the relative movement between the upper and lower sections of the compactor is limited. Another compactor is known from DE 10 2013 205 231 A1.

[0008] Such add-on compactors are used in various dimensions, with larger add-on compactors generally being used in pipeline and sewer construction, as well as add-on compactors with smaller dimensions, which are used, for example, in gardening and landscaping.

[0009] Particularly with smaller or narrower compressors, the problem arises that the mass of the unbalance due to its eccentric rotation not only causes a vibration of the attachment device, which is desired for the compression process, but also causes a transverse vibration in addition to this desired circular vibration, which leads to undesirable loads in the attachment device.

[0010] It is an object of the invention to provide an attachment device in which the undesirable transverse vibrations of the attachment device are reduced, in particular in the case of narrow attachment devices, such as those used in gardening and landscaping.

[0011] The object is achieved by an attachment tool device having the features of claim 1. Advantageous developments of the invention are specified in the subclaims.

[0012] In addition, important features for the invention can be found in the following description and in the drawing, whereby these features can be essential for the invention both in isolation and in different combinations.

[0013] The attachments according to the invention have the advantage that they can be used with lower noise emissions, particularly when designed as narrow attachments with only a comparatively small extension in the transverse direction, as is particularly the case in landscaping and horticulture. Due to the design and arrangement of the mass of the imbalance generator and the center of mass of the attachment, essentially only the desired circular vibrations are transmitted to the compactor plate or the attachment, and no or only minimal undesirable transverse vibrations. Transverse vibrations have the disadvantage that they create a noise level that can exceed 100 decibels, even when the attachment is raised from the ground.

[0014] By designing the rotating mass in such a way that the center of mass of the rotating mass in the transverse direction of the attachment device is arranged centrally between the outer side surfaces of the connecting devices spaced apart in the transverse direction and its center of mass in the transverse direction coincides with the center of mass of the attachment device, it is achieved that the undesirable transverse vibrations are reduced or completely avoided.

[0015] In the simplest case of transversely spaced connecting devices, the center of mass is located centrally between them.

[0016] According to the invention, the centers of gravity of the attachment device and the rotating mass of the imbalance generator should coincide in the transverse direction. This means that both centers of gravity are located centrally in the transverse direction between the spaced-apart outer side surfaces of the connecting devices. The height of the centers of gravity, i.e., in the direction perpendicular to the longitudinal and transverse directions (Z-direction), can differ from one another. According to one embodiment, the two centers of gravity can also coincide. Alternatively, the center of gravity of the attachment device can be closer to the attachment than the center of gravity of the imbalance generator. In principle, the reverse is also conceivable.

[0017] The transverse direction is understood to be the direction that corresponds to the longitudinal direction of the imbalance generator's rotation axis. The longitudinal direction is the direction perpendicular to this. The Z direction is understood to be the direction that runs perpendicular to the longitudinal and transverse directions and extends from the attachment toward the carrier device.

[0018] In particular, it is provided that the longitudinal direction also corresponds to the longitudinal direction of the attachment. In particular, the attachment often has one or two upwardly facing longitudinal supports, particularly if it is designed as a compactor plate, which are located on the longitudinal sides of the compactor plate and via which the connection to the upper housing section is made by means of the connecting devices. In the case of an interchangeable attachment, these lateral longitudinal supports are preferably arranged on the housing base frame.

[0019] By centric we mean that the centre of gravity lies on a central axis that bisects the attachment device in the transverse direction and runs in the Z direction.

[0020] The terms drive, motor and drive motor are used synonymously below.

[0021] In particular, it can be provided that the rotational axis of the imbalance generator, which extends in the transverse direction, is also located centrally in the longitudinal direction between connecting devices. Alternatively, the rotational axis and thus also the center of mass of the imbalance can be arranged non-centrically in the longitudinal direction. The problem of unwanted noise generation can also be solved in this case. Likewise, the center of mass of the attachment device can be located off-center in the longitudinal direction, rather than centrally. Finally, the centers of mass of the attachment device and the imbalance do not have to coincide in the longitudinal direction.

[0022] The drive shaft of the imbalance generator preferably coincides with the rotational axis of the imbalance generator. The motor shaft preferably also coincides with this axis or is coaxial with it.

[0023] In particular, at least two connecting devices can preferably be provided, which are arranged at a distance from one another in the longitudinal direction. Particularly preferably, at least three, more particularly preferably four or more, in particular six or eight, connecting devices can be provided. The connecting devices are preferably rubber-metal buffers that allow vibration of the lower part without transmitting it to the upper part, which can be coupled to the carrier device.

[0024] According to a first alternative, the eccentrically rotating mass has a first leg extending radially to the axis of rotation of the imbalance generator, and a second leg extending parallel to the axis of rotation of the imbalance generator. Particularly advantageously, the first leg is designed like a circular segment and has an opening for the axis of rotation, and the second leg preferably has the shape of a section of a cylindrical outer surface. The transition from the first to the second leg can be designed essentially as desired. Preferably, the first and second legs are connected to one another in one piece. This results in a design of the rotating mass which is essentially L-shaped and preferably extends with the second leg in the direction of the drive.The second leg is connected to the first leg at the end facing away from the opening for the rotation axis. This allows the center of mass to be positioned centrally between the outer side surfaces of the connecting device(s), which are spaced apart in the transverse direction. This is particularly possible if the transverse extension of the attachment tool is only small.

[0025] According to the invention, alternative forms of the mass of the imbalance generator are also possible, in which the mass extends in the direction of a drive and does not merely have a radially extending form, but comprises a portion extending parallel or at an angle of not equal to 90° to the axis of rotation.

[0026] The drive can be a hydraulic motor connected to a hydraulic connection on the carrier. However, other drives are also possible, such as a belt or chain drive or a spur gear.

[0027] According to a particularly preferred embodiment, the attachment can be an interchangeable attachment. Interchangeable attachments have the advantage that very different tools, such as different compactor plates, can be used. The attachment device can therefore be used very flexibly in different usage situations, for example, in narrow or wide trenches, with a correspondingly narrow or wide compactor plate. Furthermore, differently shaped compactor plates or compactor plates with different surfaces on the underside of the compactor plate can also be used. In particular, a worn compactor plate can also be easily replaced. Furthermore, other attachments, such as screening buckets, etc., can also be coupled.

[0028] It can preferably be provided that the housing base frame is designed as a cast part and in particular has openings and recesses for receiving the imbalance generator and the drive. By designing a housing base part as a housing base frame and in particular as a one-piece cast part without welds, in contrast to a housing base part that is made from burnt parts connected by welds, the possibility of shaping and geometrically adapting the housing base frame is simplified. In particular, there is the possibility of providing the receptacle for the imbalance generator and / or the preferably hydraulic drive of the imbalance generator in the operating position of the attachment device further away from the coupling device of the carrier device. In this way, lower designs can be realized. This means, the distance of the imbalance generator to the underside of the housing base can be minimized, which is not possible with welded bases in the mold.

[0029] In particular, more complex geometries can be realized with cast parts, which in turn allows the motor or imbalance generator to be positioned lower in the operating position, i.e., closer to the attachment tool. Furthermore, additional mounts, e.g., for a locking device for an interchangeable attachment tool, can be integrated directly into the cast part. For example, a locking mechanism, in which the locking device can be moved hydraulically, can be provided.

[0030] A substantially one-piece casting is understood to mean, in particular, designs that are at least 60%, preferably at least 70%, preferably at least 80%, preferably at least 90%, and preferably 100%, formed as a one-piece casting. The remaining portions of the housing base frame can be provided as separate parts and also formed as castings or as stamped or other parts. These are preferably also metal parts. These parts can then be connected to the casting by material, force, or form-fitting means. In particular, a connection via welded or screw connections is possible.

[0031] The casting of the base frame can in particular have a base and two lateral plate-like longitudinal members which, in a position of use, extend upwards at an outward angle from the base towards the upper part of the housing and are connected to the latter. The longitudinal members are preferably arranged on the lateral longitudinal edges of the base and enclose a space between them. The inclination of the longitudinal members results in particular from the casting requirements in addition to the requirements arising from the use, which should in particular also enable use with a narrow compactor plate while at the same time ensuring sufficient stability during transition to the excavator. The base frame can have a complex shape in order to accommodate the various components, such as the locking device for interchangeable attachment tools.In cross-section, the base frame forms a U-shaped design, in particular with inclined legs that point outwards on their side facing away from the ground.

[0032] Recesses for the drive and the imbalance generator (excitation unit) can be created directly in the housing base frame without additional processing steps such as burning or cutting, thus simplifying the production of the housing base (housing base frame). Furthermore, curves and transitions can be more easily realized in cast parts. Furthermore, complex geometric shapes deviating from the pure plate shape can be created without additional effort.

[0033] It is part of the invention to provide the possibility, by means of the housing base frame, which is designed as a cast part, to relocate, in particular, the unit for generating the imbalance, and preferably also a drive for it, into the area of ​​the base frame. This means that at least part of this unit is integrated into the area of ​​the base frame and not arranged on top of it as has previously been the case. In particular, the recesses for the imbalance generator and / or drive extend into the base frame.

[0034] If the attachment is interchangeable, it can be equipped with a locking latch. This eliminates the time-consuming process of screwing the compactor plate to the housing, especially the lower part or housing base frame. Such a latch is also particularly robust in the tough everyday use of an attachment and is easier to manufacture than, for example, a rotation lock.

[0035] In a further development, it is proposed that such a locking bar be constantly loaded in the locking direction during operation. This ensures a constant force connection during operation, and the attachment is always coupled to the excavator without any play. Even dirt particles that are initially jammed between the attachment and the excavator and then become loose during operation do not cause any play, as the locking bar automatically re-tensions the attachment relative to the excavator.

[0036] It is particularly preferred if the locking device comprises a central lock that is arranged essentially between the two longitudinal members. The longitudinal members preferably extend along the longer longitudinal sides (in the longitudinal direction), whereas the narrow sides run in the transverse direction and preferably have no limitation in the vertical direction (Z direction) in the position of use. The displacement path of the lock essentially corresponds to the longitudinal direction. Even in the extended position, the lock preferably does not protrude beyond the circumference of the housing base frame. The locking device can be integrated into the base frame.

[0037] Furthermore, it can be provided that a mechanical securing device is provided which, in the case of an interchangeable, detachable attachment tool, secures the attachment tool device or its housing in particular against falling when the locking device is unlocked (unsecured or unlocked (or incorrectly locked) state of the locking device). Such a configuration has the advantage that unintentional detachment or falling of the attachment tool from the attachment tool device, for example as a result of incorrect operation, can be avoided because the securing device secures the attachment tool to the attachment tool device regardless of the locking state of the locking device. Even if the locking device is undesirably unlocked due to incorrect operation, for example.This significantly reduces the risk of injury when an attachment is raised by an excavator arm, as the attachment cannot become detached from the attachment, or at least not completely. This contributes to the safety of operating attachments with interchangeable attachments. By implementing a mechanical safety device, a solution with a high level of operational reliability (few components with a low risk of failure) is created at a comparatively low price. In particular, complete detachment of the attachment in the event of incorrect operation (e.g., by accidentally actuating a hand lever that activates the locking device) can be avoided. A mechanically robust design of the components of the safety device creates a simple primary safeguard that can also be used as a retrofittable solution.

[0038] The attachment device can, for example, be an attachment compactor. The attachment can, in particular, be a compactor plate. However, other components can also be coupled as attachments, such as a screening bucket.

[0039] Within the scope of a preferred embodiment, the securing device can be designed such that it catches or catches the interchangeable attachment in a position that deviates from the position of the interchangeable attachment fixed to the housing base frame. In other words, the securing device can be designed as a catching device, wherein the interchangeable attachment is caught outside of its fixing position or fixing position on the attachment device. Thus, during proper operation (attachment correctly coupled to the attachment device), the securing device is not subjected to any stress or only to negligible stress, but only when it is actually necessary for safety reasons. In principle, unnecessary stresses or unnecessary wear can be avoided, which contributes to a long service life of the securing device.

[0040] The safety device can expediently be designed to be retrofittable. This not only allows for retrofitting existing attachments, but also for replacing the safety device if necessary (spare parts supply). The safety device can be retrofitted, in particular, by fastening it to the housing base frame of the attachment, e.g., by screwing or welding. It is particularly preferred if the safety device is integrally connected to the housing base frame, in particular by forming part of the cast part.

[0041] Advantageously, the securing device can be designed as a catching element attached or provided on the housing base frame of the attachment device, which is configured such that it interacts (to catch the attachment tool) with a coupling section of the interchangeable attachment tool that serves to fix the interchangeable attachment tool to the housing base frame of the attachment tool device, e.g., a preferably cylindrical rod attached to the attachment tool. This creates a securing device with simple structural means, since only the attachment tool device needs to be equipped with a catching element. A coupling section that serves to fix it to the attachment tool device and is therefore already present is used on the attachment tool. The catching element can partially encompass the coupling section or engage behind it.During proper operation, the catch element and the coupling section can be spaced apart from each other and only engage each other when the interchangeable attachment begins to fall. The catch element can, for example, have a hook-shaped cross-section, with an opening provided in the hook-shaped cross-section, which is preferably oriented upwards (away from the fixed attachment).

[0042] The catch element can expediently be provided on a lower part of the housing base frame, in particular on one of its narrow sides. This allows for a structurally favorable load introduction, as the housing base frame is robustly designed and suitable for load transfer, as the attachment tool is also fixed and held there. By arranging the catch element on one of the narrow sides of the housing base frame, the type of coupling (hanging the attachment tool on one side and locking it on the other side) can be retained. In addition, an attachment tool can be fixed to the housing base frame of the attachment tool device in two positions rotated by 180°.

[0043] Specifically, the housing base frame of the attachment device can have a first connecting section that interacts with a first coupling section (in particular a cylindrical rod) of the attachment device, and a second connecting section that interacts with a second coupling section (in particular a cylindrical rod) of the attachment tool. The connecting sections are formed or attached to the housing base frame of the attachment device, and the coupling sections are formed or attached to the attachment tool. By coupling the connecting sections to the coupling sections, the attachment tool can be fixed to the housing base frame of the attachment tool device with the aid of the locking device.

[0044] In a preferred embodiment, the catch element can be arranged on the narrow side of the housing base frame of the attachment device (hook-in side), which is opposite the narrow side on which a bolt of the locking device acts (locking side), which serves to fix the attachment device to the housing base frame. This embodiment does not impair the process of coupling and changing the attachment device.

[0045] The catching element can expediently have a first section (proximal section) extending parallel to the underside of the housing base frame or diagonally away from the housing base frame, and a second section (distal section) adjoining the first section, which is angled or curved relative to the first section. The catching element is open at the top (away from the underside) and closed at the bottom (towards the underside). This enables reliable catching of the attachment tool when it is released from the attachment tool device, since the catching element can catch the attachment tool even during a comparatively large release movement. As already indicated, the catching element can have a hook-shaped cross-section due to the first section and the second section as a whole.

[0046] Within the scope of a preferred embodiment, the catch element can be arranged centrally with respect to the narrow side of the housing base frame and / or the catch element can extend over a section of the narrow side of the housing base frame. The central arrangement of the catch element allows a pivoting movement of the attachment tool about the longitudinal axis of the coupling section, e.g. a cylindrical rod, but reduces the risk of (lateral) tilting towards the ends of the coupling section. If the catch element extends over a section of the narrow side of the housing, a sufficiently stable design of the catch element is created so that the attachment tool can be securely caught. In addition, lateral tilting of the attachment tool towards the ends of the coupling section can be counteracted. The catch element(s) can, for example, extend over a range of 10 to 30 percent (together) of the width of the narrow side of the housing base frame.The provision of two catch elements on either side of a longitudinal central axis (central axis) of the housing base frame is particularly preferred, since this can prevent tilting even more reliably.

[0047] As previously mentioned, the catch element of the safety device can be designed as a catch hook. This enables safe and reliable catch of the attachment tool in the event of an accidental release from the attachment tool device.

[0048] In a preferred embodiment, two spaced-apart receiving sections for receiving a rigid holding element of a transport means can also be formed on the attachment tool. This simplifies handling of the attachment tool and also of the attachment tool device as a whole, since the receiving sections allow for easy handling using a lifting device, e.g., a forklift. The receiving sections can, for example, be formed as recesses in a side plate of the attachment tool.

[0049] According to a preferred embodiment, the rotational axis can be a shaft of the imbalance generator, and preferably also of the drive motor. In principle, however, different shafts for the drive and imbalance generator are also conceivable, which are coupled via belts, chains or gear (spur gear) arrangements. The shaft of the imbalance generator is mounted on two bearings, between which the mass of the imbalance is arranged on the shaft and can rotate with the shaft. The bearings can be designed or dimensioned differently depending on their function. In particular, one of the bearings can be designed as the main bearing and the other bearing as a support bearing. If the mass of the imbalance is L-shaped, it can be provided that the second leg of the mass covers one of the bearings in the longitudinal direction of the shaft. In this way, it can be achieved that the entire arrangement of the imbalance and drive is particularly slim, i.e.with a small extension in the transverse direction, and can thus provide inexpensive compactors and, in particular, attachments for use in gardening and landscaping.

[0050] The bearings may preferably be cylindrical roller bearings, wherein further preferably both bearings are cylindrical roller bearings.

[0051] It is also advantageous if the drive does not protrude beyond the base frame in the transverse direction. This allows for a narrow overall width and further positively influences vibration behavior.

[0052] According to a particularly preferred embodiment, a shaft sealing ring can be provided between a bearing, in particular a cylindrical roller bearing, which is designed in particular as a main bearing, and the drive motor.

[0053] Embodiments of the invention are explained in more detail below with reference to the accompanying drawings.

[0054] The drawings show Fig. 1 a housing base frame of an attachment tool device according to the invention in a perspective view; Fig. 2 the housing base frame Fig. 1 in a top view; Fig. 3 an excerpt from Fig. 1 in a different position of the unbalance; Fig. 4 a pressure compensation arrangement and Fig. 5 Cross section through a housing base frame of an attachment tool device according to the invention.

[0055] Fig. 1 shows a housing base frame 16 of an attachment tool 10. The attachment tool 10 includes, in addition to the housing base frame 16, a housing upper part 26 (not shown in detail). The two housing parts 16, 26 together form a housing. The housing parts 16, 26 are coupled via elastically movable connecting devices 18, which are spaced apart at least in the transverse direction 14 and are designed here as rubber-metal buffers. In the present embodiment, four connecting devices 18 are provided.

[0056] The longitudinal direction 12 runs perpendicular to the transverse direction 14. The central axis 15 extends in the Z direction 17 ( Fig. 5).

[0057] Thus, each pair of connecting devices 18 spaced apart in the transverse direction 14 is spaced apart in the longitudinal direction 12 from another pair of connecting devices 18.

[0058] The connecting devices 18 have outer side surfaces 21 and inner side surfaces 23. In the present case, the inner side surfaces 23 are connected to the housing upper part 26 and the outer side surfaces 21 are connected to the housing base frame 16.

[0059] In the present case, the housing base frame 16 is formed as a cast part and has corresponding recesses, on the one hand, to be connected to the connecting elements 18, but on the other hand also to accommodate a drive motor (drive) 20, which is designed as a hydraulic motor, and an imbalance generator 22. The hydraulic motor 20 is arranged such that it does not protrude, or does not protrude significantly, beyond the housing base frame 16 in the transverse direction.

[0060] An attachment tool, here a compressor plate 24, can be arranged on the housing base frame 16 either in an exchangeable manner, as in the present case, or in a permanently connected manner.

[0061] The upper housing part 26 is connected by means of rotary unions to a coupling part, which can be attached to an arm of a carrier device (not shown), in particular to an excavator. For this purpose, the coupling part has hydraulic quick connectors (also not shown), with which the attachment device can be connected to a hydraulic supply of the carrier device.

[0062] The hydraulic motor 20 is held in a recess in the housing base frame 16. It has a drive shaft, which in this case is also the drive shaft 30 of the imbalance generator 22. The drive 20 is fixed to a bearing cover 28 and to the housing base frame 16, with the shaft of the imbalance generator 22 running in the transverse direction 14 and forming a rotation axis. The drive shaft 30 of the imbalance generator 22 is mounted via two bearings (here cylindrical roller bearings) 32 and 34, with the bearing 34, as the main bearing, being radially enclosed on the outside by the bearing cover 28. The bearing 32 is designed as a support bearing.

[0063] On the shaft 30, an unbalance generator 22 is arranged, wherein the unbalance generator 22 comprises an unbalance-generating mass 41, which in the present case consists of a, as in Fig. 2, first leg 44 and a second leg 46, which are integrally connected to one another and in particular, as shown in Fig. 2, form an L-shape.

[0064] In the exemplary embodiment, the first leg 44 has a recess (bore) 48 in which the drive shaft 30 is received or through which the shaft extends, and via which the imbalance generator is driven. The mass 41 of the imbalance is provided, as is customary, only over a portion of the circumference of the drive shaft 30. The present design of the imbalance 41 is such that the center of mass S2 of the imbalance 41 lies centrally in the transverse direction 14 between two outer side surfaces 21 of the connecting devices 18, spaced apart in the transverse direction 14.

[0065] At the same time, the center of mass S1 of the attachment device 10 is located centrally between the two outer side surfaces 21 of the connecting devices 18, which are spaced apart in the transverse direction.

[0066] As in Fig. 5, the centers of mass S1 and S2 can, however, be offset from one another in the Z direction 17. In particular, in the present case, the center of mass S1 of the attachment device 10 is arranged closer to the attachment tool 24 in the Z direction than the center of mass S2 of the imbalance-generating mass 41.

[0067] In this way, transverse vibrations can be reduced or even avoided altogether.

[0068] In the manner described above, even in the case of narrow or narrow attachment devices that have only a small extension in the transverse direction 14, the center of mass of the imbalance generator 22 can be arranged centrally between the outer side surfaces 21 of the connecting devices 18, which are spaced apart in the transverse direction 14. The center of mass S1 of the attachment device 10 is also located centrally between the outer side surfaces 21.

[0069] The position of the centers of mass S1 and S2 in the longitudinal direction 12 of the attachment device 10 can be offset from one another. Preferably, the center of mass S1 of the attachment device 10 is centrally located in the longitudinal direction 12 between connecting devices 18 spaced apart in the longitudinal direction 12.

[0070] In this way, only or predominantly the desired circular oscillation is generated. In particular, it can be provided that the second leg 46 of the unbalanced mass 41 extends toward the drive motor 20 and, in particular, overlaps the bearing cover 28 radially outward. The bearing cover 28 and, in particular, the second leg 46 of the mass of the unbalanced mass 41 can be geometrically matched to one another.

[0071] Fig. 3 shows a section of Fig. 1 and Fig. 2 with a different position of the imbalance 41 in a perspective view. Also visible here are the drive motor 20, the drive shaft 30, and the two bearings 32 and 34. To prevent the leakage of bearing fluid, a shaft seal 50 is provided between the drive motor 20 and the bearing.

[0072] In addition, a compensating piston 60 including a check valve is provided to compensate for the pressure in the area 62 in which the unbalance is guided and mounted. The design of this pressure compensation arrangement for pressure compensation is particularly Fig. 4 shown.

[0073] The shaft seal 50 seals the bearing and unbalance area 62 from the drive motor 20 and the environment. In particular, the invention provides that the area 62 in which the unbalance mass 41 is arranged can be designed as a closed system. This prevents air from entering the oil located there. Connected to the area 62 in which the unbalance mass 41 rotates is a bore (compensation bore 63) in which the piston 60 is movably guided. If the pressure in the area 62 in which the unbalance 41 rotates increases, in particular due to heating, the piston 60 is displaced in the bore 63 and the pressure in the area 62 of the unbalance 41 is thus kept constant. The bore 63 for the piston 60 and the movement path of the piston 60 are designed accordingly. If the chamber then cools down again, the compensating piston 60 is then moved back to its original position.

[0074] To allow the piston 60 to vent to the atmosphere, since the outwardly opening bores are closed by inserts 66, a sintered filter 65 is provided, to which the side of the piston bore 63 facing away from the area is connected. In this way, it can be ensured that no pressure is exerted on the shaft seal 50, as would otherwise occur with increasing internal pressure in the area 62 of the unbalance 41. Wear on the shaft seal 50 can be significantly reduced in this way.

[0075] In the manner described above, undesirable transverse vibration can be avoided, particularly in the case of narrow attachments, in particular compressors, such as those used in gardening and landscaping.

Claims

[1] Attachment device, in particular an attachment compactor, which can be coupled to a carrier device, in particular an excavator, wherein the attachment device has a longitudinal direction (12) and a transverse direction (14), comprising a housing with a housing base frame (16) and a housing upper part (26), which are elastically movably connected via connecting devices (18) spaced at least in the transverse direction (14), wherein the connecting devices each have at least one outer side surface (21) with respect to the housing and, wherein the connecting devices (18) are connected by a side surface (23) to the housing upper part (26) and by a side surface (21) to the housing base frame (16), and with an attachment tool (24), in particular a compactor plate, wherein an unbalance generator (22) is provided in the housing base frame (16) in order to set the attachment tool (24) into vibration,wherein the imbalance generator (22) comprises an eccentrically rotating mass (41) with a center of mass, which is driven by a drive (20) arranged in the housing base frame (16), wherein the eccentrically rotating mass (41) is geometrically designed such that its center of mass S2 in the transverse direction (14) of the attachment device (10) is arranged centrally between the connecting devices (18) spaced apart in the transverse direction (14) and its center of mass S2 coincides with the center of mass S1 of the attachment device (10) in the transverse direction, , characterized bythat the eccentrically rotating mass (41) has a first leg (44) extending radially to the axis of rotation (20) of the imbalance generator (22) and a second leg (46) extending parallel to the drive shaft (30) of the imbalance generator (22) or has a shape in which the mass (41) extends in the direction of the drive (20) and does not merely have a radially extending shape, but comprises a portion extending parallel to or at an angle of not 90° to the axis of rotation. [2] Attachment tool device according to claim 1, characterized by , wherein a rotation axis of the unbalance generator (22) is arranged centrally between connecting devices (18) in the longitudinal direction (12). [3] Attachment tool device according to claim 1 or 2, characterized by that the center of mass S1 and / or the center of mass S2 are arranged centrally between connecting devices (18) in the longitudinal direction (12). [4] Attachment tool device according to one of the preceding claims, characterized by that at least 2 or more connecting devices (18) are provided. [5] Attachment tool device according to one of the preceding claims, characterized by that the first leg (44) is designed like a circular segment and has an opening (48) for receiving the drive shaft (30). [6] Attachment tool device according to one of the preceding claims, characterized by that the second leg (46) forms a section of a cylindrical outer surface which extends in the direction of the drive (20), wherein one end of the second leg (46) is connected to the first leg (44) at its end facing away from the opening (48) for the drive shaft (30). [7] Attachment tool device according to one of the preceding claims, characterized by that the attachment tool is an interchangeable attachment tool (24). [8] Attachment tool device according to one of the preceding claims, characterized by that the housing base frame (16) is essentially designed as a cast part and in particular has openings and recesses for receiving the unbalance generator (22) and the drive (20). [9] Attachment tool device according to one of the preceding claims, characterized by that the drive shaft (30) of the unbalance generator (22) runs transversely to the longitudinal direction of the attachment tool (24). [10] Attachment tool device according to one of the preceding claims, characterized by that the mass (41) of the unbalance generator (22) is formed as a single piece as a cast part. [11] Attachment tool device according to one of the preceding claims, characterized by that the drive shaft (30) is mounted via two bearings, in particular cylindrical roller bearings, (32, 34), between which the mass (41) is arranged on the drive shaft (30) and is rotatable with the drive shaft (30). [12] Attachment tool device according to one of the preceding claims, characterized by that the second leg (46) of the mass (41) covers a cylindrical roller bearing (34) in the longitudinal direction of the drive shaft (30). [13] Attachment tool device according to one of the preceding claims, characterized by that the drive motor (20) does not protrude beyond the base frame (16) in the transverse direction (14). [14] Attachment tool device according to one of the preceding claims, characterized by that a shaft sealing ring (50) is provided between the bearing (32, 34) and the drive motor (20). [15] Attachment tool device according to one of the preceding claims, characterized by that a pressure compensation arrangement is provided for the area in which the unbalance (41) is guided. [16] Attachment tool device according to claim 15, characterized by that the pressure compensation arrangement comprises a compensating piston (60) guided in a compensating bore (63). [17] Attachment tool device according to claim 15 or 16, characterized by that the compensating bore (63) is vented via a sintered filter (68) on the side of the compensating piston (60) facing away from the area (62) of the unbalance (41).

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