Construction machine

Abstract

The utility model relates to a construction machine, in particular to a ground compacting machine, which comprises at least one system area (24) capable of rotating relative to a machine frame (22) around a rotating axis (D) and at least one first electrical unit (78) on the rotatable system area (24), the at least one first electrical unit (78) is connected in an electrically conductive manner to the at least one second electrical unit (80), which is supported outside the rotatable system region (24) relative to the machine frame (22), by means of a line connection (82), characterized in that the line connection (82) comprises a first line path (84), in which the first line path (84) comprises at least one sealing device (56), the sealing device (56) tightly seals the rotatable system area (24) relative to the non-rotating system area (42) supported by the machine frame (22).

Description

Technical Field

[0001] The present utility model relates to a construction machine (such as a ground compactor) having a system area rotatably supported on a frame about a rotation axis. Background Art

[0002] Such a construction machine is known from DE 10 2016 121 724 A1. In such a construction machine designed as a ground compactor, energy is wirelessly transmitted between an electric energy consumption device arranged in a ground processing roller and a power supply arranged outside the ground processing roller by induction. Summary of the Utility Model

[0003] The object of the present utility model is to provide a construction machine in which a conductive connection in a rotating system area can be provided in a simple and reliable manner.

[0004] According to the present utility model, this object is achieved by a construction machine (in particular a ground compactor) comprising at least one system area rotatable relative to the frame about a rotation axis and at least one first electrical unit located on the rotatable system area, wherein the at least one first electrical unit is conductively connected to at least one second electrical unit by means of a pipeline connection (Leitungsverbindung), and the second electrical unit is supported relative to the frame outside the rotatable system area.

[0005] The pipeline connection includes a first pipeline path (Leitungspfad), wherein the first pipeline path includes at least one sealing device that tightly seals the rotatable system area from the non-rotating system area supported relative to the frame.

[0006] In order to transmit electric energy or electrical signals between the rotatable system area of the ground processing machine and an area outside the rotatable system area (i.e., a system area that does not rotate with the rotatable system area), the present utility model uses components usually located on the construction machine to perform other functions. At least one sealing device mainly ensures that the internal volume of the rotatable system area is enclosed outward, so that for example, lubricant leakage can be prevented and contaminants can be reliably prevented from entering this volume area.

[0007] In an advantageous design, at least one sealing device may include a slip ring seal (Gleitringdichtung), wherein the slip ring seal includes a first slip ring made of a conductive material and supported relative to the rotatable system area, and a second slip ring made of a conductive material and supported relative to the non-rotating system area, wherein the first slip ring and the second slip ring are supported relative to each other so as to be able to rotate relative to each other about the axis of rotation in the direction of the axis of rotation. For reasons of stability and durability, the slip rings are advantageously generally made of a metallic material (such as steel).

[0008] To ensure a defined positioning of the slip rings, it is proposed that the first slip ring be radially outwardly supported relative to the rotatable system area in a first axial direction by means of an annular first sealing element, and that the second slip ring be radially outwardly supported relative to the non-rotatable system area in a second axial direction opposite to the first axial direction by means of an annular second sealing element.

[0009] To be able to ensure a tight seal in the area of the slip rings supported directly against each other, it can be provided that the first slip ring has a first axial support area and that the second slip ring has a second axial support area axially supported on the first axial support area.

[0010] For example, to minimize the load, each of the first axial support area and the second axial support area may include a support surface extending substantially radially.

[0011] The first slip ring and the second slip ring can be axially pressed into contact with each other with their first axial support area and second axial support area by means of the annular first sealing element and the annular second sealing element.

[0012] To establish an electrical connection, it is further proposed that the first slip ring be conductively connected to at least one first electrical unit by means of a first connecting line, and that the second slip ring be conductively connected to at least one second electrical unit by means of a second connecting line. These connecting lines can be designed, for example, in the form of cables, conductive rails, etc.

[0013] To stabilize the contact, the first connecting line can be conductively connected to the first slip ring by a material connection (preferably welding and / or clamping and / or screwing), and / or the second connecting line can be conductively connected to the second slip ring by a material connection (preferably welding or / and clamping and / or screwing).

[0014] According to one aspect of the utility model for solving the above object, regardless of the way of providing the first pipeline path, it is further proposed that the pipeline connection includes a second pipeline path, wherein the second pipeline path includes at least one bearing unit, and the bearing unit rotatably supports the rotatable system area relative to the non-rotating system area supported by the frame around the axis of rotation.

[0015] At least one bearing unit may include a rolling element bearing having an outer bearing ring made of a conductive material, an inner bearing ring made of a conductive material, and a plurality of rolling elements made of a conductive material supported on the outer and inner bearing rings. For reasons of stability and durability, it is also advantageous if the individual components of such a bearing unit are made of a metallic material (such as steel).

[0016] For electrical contact, at least one bearing unit may be conductively connected to at least one first electrical unit by means of a third connecting line, and at least one bearing unit may be conductively connected to at least one second electrical unit by means of a fourth connecting line.

[0017] In particular, if the second pipeline path provides the ground connection of the construction machine or is to be connected to the construction machine, it is advantageous if the third connecting line includes at least one conductive, supporting structural element of the rotatable system area. The second pipeline path may be provided at least in part by existing components of the rotatable system area.

[0018] For this purpose, it may be provided that at least one bearing unit is radially and / or axially supported on at least one conductive, supporting structural element.

[0019] For example, it may also be provided that the second pipeline path includes a roller drive motor, wherein the rotor area is rotatably supported relative to the stator area by means of one or more conductive bearing units.

[0020] In order to suppress or reduce the transmission of vibrations between the rotatable system area and the machine frame, it is proposed that the non-rotatable system area is supported on the machine frame by means of a plurality of elastic, electrically insulating suspension elements.

[0021] At least one first electrical unit may include an electrical energy consuming device, preferably a sensor and / or a transmitter unit. It may also be provided that at least one second electrical unit includes a power source, preferably a battery and / or a generator.

[0022] In particular, when the construction machine is designed as a ground compactor (such as a self-propelled ground compactor), the rotatable system area may include a ground working roller.

[0023] By means of at least one sealing device, the volume containing the imbalance device having at least one imbalance mass can be tightly sealed in the ground working roller, and the imbalance mass can rotate about an imbalance rotation axis. Description of the Drawings

[0024] The present invention will be described in detail below with reference to the accompanying drawings. The drawings show:

[0025] Figure 1 Side view of a construction machine designed as a self - propelled ground compactor;

[0026] Figure 2 Is Figure 1 Longitudinal sectional view of the ground - working roller of the construction machine;

[0027] Figure 3 Is Figure 2 Enlarged view of detail III in;

[0028] Figure 4 Is Figure 1 Stereoscopic sectional view of the slip - ring seal of the ground - working roller of the construction machine. Detailed implementation mode

[0029] Figure 1 Shows a side view of a construction machine 10 designed as a self - propelled ground compactor. The construction machine 10 includes wheels 14 driven on a rear vehicle 12. The wheels 14 are driven by a drive assembly provided on the rear vehicle 12 to move the ground - working machine 10 on a foundation 16 to be compacted. An operating console 18 is provided on the rear vehicle 12, where there is space for an operator to operate the ground - working machine 10.

[0030] The front vehicle 20 of the ground - working machine 10 is articulated to the rear vehicle 12 for maneuvering the rear vehicle 12. On the front vehicle 20, which basically provides the components of the frame 22 of the ground - working machine 10, a ground - working roller 26 of a rotatable system area 24 of the ground - working machine 10 is rotatably supported about a roller rotation axis D orthogonal to the drawing plane of Figure 1 .

[0031] In the shown design example, Figure 2 The ground - working roller 26 shown in longitudinal section in is also driven to rotate and for this purpose has a roller drive motor 32. The roller drive motor 32 is connected to a roller cover 30 via a disc - shaped support element 28 (usually also called a disc). The stator area of the roller drive motor 32 can be supported on the front vehicle 20 via a plurality of elastic suspension elements (not shown), while the rotor area of the roller drive motor 32 is connected to the support element 28.

[0032] A first bearing support element 36 is used to support the ground - working roller 26 in its end area visible on the Figure 2 right side and provides a support structural element for the ground - working roller 26. The first bearing support element 36 is fixed, for example, by screws to another disc - shaped support element 34. A second bearing support element 44 providing one or a part of a non - rotating system area 42 is supported on the first bearing support element 36 via two bearing units 38, 40, which two bearing units are in Figure 3are visible and arranged at a certain axial distance from each other. The second bearing support element 44 can be supported on the front vehicle 20, for example, by means of a plurality of elastic suspension elements.

[0033] The unbalance motor 46 is supported on the second bearing support element 44, and its drive is arranged to rotate an unbalance device 48 inside the ground processing roller 26 about an unbalance axis U corresponding to the roller rotation axis D in the illustrated example of the design. In the illustrated example of the design, the unbalance device 48 includes two unbalance mass blocks 50, 52, which are arranged at a certain axial distance from each other and have centers of gravity eccentric to the unbalance rotation axis U. The volume 53 substantially containing the unbalance device 48 inside the ground processing roller 26 is enclosed between two disc-shaped support elements 34 by a cylindrical housing 54, which is connected to the two disc-shaped support elements 34, for example, by welding and is thus also constructed of a metallic material, and in particular the part Figure 2 visible on the right side is also enclosed by the first bearing support element 36.

[0034] To achieve a tight seal between the first bearing support element 36 and the second bearing support element 44 during the ground processing operation, while the first bearing support element 36 and the second bearing support element 44 rotate relative to each other about the roller rotation axis D, a sealing device 56 is provided Figure 3 and Figure 4 the details of which are visible in. The sealing device 56 includes a slip ring seal 58 having two axially continuous slip rings 60, 62. The first slip ring 60 is tightly sealed, for example, relative to the rotatable system area 24 mainly including the ground processing roller 26 via an O-ring-shaped first sealing element 64. For this purpose, a sealing element support 66 is fixed, for example, to the first bearing support element 36, and the first sealing element 64 is supported on the sealing element support 66 Figure 3 radially outward and axially left with respect to the roller rotation axis D. Similarly, the first sealing element 64 is supported Figure 3 radially inward and axially right on the first slip ring 60.

[0035] The second slip ring 62 is supported relative to the second bearing support element 44 via an O-ring-shaped second sealing element 67. Here, the second sealing element 67 is supported Figure 3 radially outward and to the right on the second bearing support element 44, and Figure 3 radially inward and to the left on the second slip ring 62.

[0036] The two slip rings 60, 62 are axially supported against each other in the region of a first axial support region 68 of the first slip ring 60 and a second axial support region 70 of the second slip ring 62. Each of the two axial support regions 68, 70 can be provided, for example, by a substantially radially extending, annular support surface.

[0037] By means of an axial prestress generated by two sealing elements 64, 67, the two slip rings 60, 62 which are directly supported against each other in their axial support regions 68, 70 are axially preloaded against each other such that a tight seal is produced between the two slip rings 60, 62. Thus, entry of contaminants, in particular into the volume 53, can be reliably prevented by the sealing device 56 designed as a slip ring seal 58, and the outflow of lubricant from this volume region and from the region of the two bearing units 38, 40 can be prevented.

[0038] Each of the two bearing units 38, 40 is designed as a rolling bearing having an outer bearing ring 72, an inner bearing ring 74 and a plurality of rolling elements 76. The outer bearing ring 72 is supported radially outwards and axially relative to the second bearing support element 44, the inner bearing ring 74 is supported radially inwards and axially relative to the first bearing support element 36, and the plurality of rolling elements 76 (e.g. balls) act therebetween or roll along the circumferential direction thereon. Just like the two slip rings 60, 62, the bearing rings 72, 74 and the rolling elements 76 are constructed from a metallic material (e.g. steel) for reasons of stability and durability.

[0039] Figure 1 In principle, at least one first electrical unit 78 is shown as being arranged in the ground working roller 26 which provides the rotatable system region 24 of the construction machine 10. The electrical unit 78 can include, for example, one or more sensors, such as acceleration sensors, to provide information about the movement state of the ground working roller 26. The at least one first electrical unit 78 can alternatively or additionally include a transmitting / receiving unit which is designed to transmit and / or receive data in the form of electrical signals.

[0040] For example, at least one second electrical unit 80 is provided on the rear vehicle 12 of the construction machine 10. The second electrical unit 80 can include, for example, a power supply. For example, the second electrical unit 80 can include a rechargeable battery of the construction machine 10, and the first electrical unit 78 in the ground working roller 26 is supplied with electrical energy from this rechargeable battery via the schematically shown line connection 82. Alternatively or additionally, the second electrical unit 80 can include a transmitting / receiving unit which is designed to transmit and / or receive data in the form of electrical signals.

[0041] For example, this structure can enable the first electrical unit 78 in the floor processing roller 26 to be supplied with electrical energy from the second electrical unit 80 via the pipeline connection 82. Information provided by the first electrical unit 78 (for example, in the form of a sensor signal) can be transmitted between the first electrical unit 78 and the second electrical unit 80 or another electrical unit provided therefor, for example, wirelessly via radio and / or inductively or also possibly via the pipeline connection 82.

[0042] In particular, in order to supply electrical energy from the second electrical unit 80 to the first electrical unit 78, the pipeline connection 82 includes two pipeline paths 84, 86 shown in principle in Figure 3 . The first pipeline path 84 can be used, for example, to connect the first electrical unit 78 to the positive pole of the second electrical unit 80 including a battery. The second pipeline path 86 can be used to connect the first electrical unit 80 to the negative pole of the second electrical unit 80 including a battery or to a ground connection of the frame 22 of the construction machine 10 which also includes the second pipeline path 86.

[0043] In order to guide the first pipeline path 84 into the rotatable system area 24, that is, the floor processing roller 26, it includes a sealing device 56 which serves as a kind of rotary joint (Drehdurchführung). The first slip ring 60 of the sealing device is conductively connected to the first electrical unit 78 by means of a first connecting pipeline 88 of the first pipeline path 84, which is designed as a cable, for example. For this purpose, the first connecting pipeline 88 can be conductively and firmly connected to the first slip ring 60 by means of a clamping element 90, for example. Alternatively or additionally, the first connecting pipeline 88 can be conductively connected to the first slip ring 60 by means of a threaded connection or a material connection (such as welding).

[0044] The second connecting pipeline 92 of the first pipeline path 84, which is designed as a cable, for example, conductively connects the second slip ring 62 to the positive pole of the second electrical unit 80 including a battery, for example. The second connecting pipeline 92 can be conductively and firmly connected to the second slip ring 62 by means of a clamping element 94. Alternatively or additionally, the fixed conductive connection between the second slip ring 62 and the second connecting pipeline 92 can be achieved by means of a threaded connection or a material connection (such as welding).

[0045] Since the two slip rings 60, 62 are constructed of a conductive metallic material and are in direct contact with each other, current can flow in the first pipeline path 84 between the two electrical units 78, 80 via the two connecting pipelines 88, 92 and the two slip rings 60, 62 of the slip ring seal 58. Since the two slip rings 60, 62 are supported only relative to the ground processing roller 26 or the frame 22 via the sealing elements 64, 67 interacting therewith, they are not in direct contact with other components of the construction machine 10, and other components of the construction machine 10 are electrically insulated from the rotatable system area 24 and the frame 22 via the sealing elements 64, 67, which are generally constructed of an electrically insulating material. Therefore, there is no risk of short circuit via the slip rings 60, 62.

[0046] The second pipeline path 86 for generating a ground connection, for example, includes at least one of the two bearing units 38, 40 as a kind of rotary joint. Since the two bearing units 38, 40 are basically constructed of a conductive metallic material, and their bearing inner rings 74 are placed or supported on the first bearing support element 36 and are thus in conductive contact therewith, the first bearing support element 36, as a conductive support structure element of the ground processing roller 26, can form part of the third connecting pipeline 96 of the second pipeline path 86. Other components of the ground processing roller 26 (such as the support elements 28, 34 and the housing 54) can form part of the third connecting pipeline 96 as support structure elements of the ground processing roller 26. Therefore, the negative connection or the ground connection of the first electrical unit 78 can be directly connected to such a support structure element of the ground processing roller 26 and is thus conductively connected to the two bearing units 38, 40 via the third connecting pipeline 96.

[0047] The fourth connecting pipeline 98 of the second pipeline path 86 includes a second bearing support element 44, which supports the two outer bearing rings 72 of the bearing units 38, 40 and is constructed of a metallic material. As described above, the second bearing support element 44 is supported by the front vehicle 20 or the frame 22 of the construction machine 10 via elastic and generally electrically insulating suspension elements, and the same is true for the roller drive motor 32 located at the other axial end of the ground processing roller 26 for vibration decoupling. These suspension elements can be designed as rubber buffers, for example.

[0048] In order to bridge this electrically insulating suspension area, the second pipeline path 86 includes, for example, a cable as a component of the fourth connecting pipeline 98, which is conductively connected to the second bearing support element 44 on the one hand and, for example, to the front vehicle 20 on the other hand, and thus provides a connection of the second bearing support element 44 of the non-rotating system area 42 to the frame 22 of the construction machine 10. The frame 22, which is generally constructed of a metallic material, can basically provide a grounding area, and the negative connection of the second electrical unit 80 including the battery is connected to this grounding area.

[0049] Thus, the two pipeline paths 84, 86 of the pipeline connection 82 include an effective system area, which has a sealing device 56 and two bearing units 38, 44 as rotary joints for electric current, and the effective system area is substantially present in such a construction machine 10. Thus, a costly and error-prone wireless transmission system, especially a wireless transmission system for feeding electrical energy into the rotatable system area 24, can be dispensed with. It should be emphasized again that the pipeline connection 82 including the two pipeline paths 84, 86 can also be used alternatively or additionally for transmitting data or general information from or to the first electrical unit 78.

[0050] In particular, as an alternative or supplement to using one or two bearing units 38, 40, the second pipeline path 86 for generating a conductive coupling to the grounding area of the construction machine 10 can also include a roller drive motor 32. For example, the stator area of the roller drive motor 32 can be connected via a cable of a component providing a fourth pipeline path 98 to the front vehicle 22 and thus to the frame 22 of the construction machine 10, while the rotor area of the roller drive motor 32 forms a component of a third connection pipeline 96 coupled to its conductive, supporting structural element in the rotatable system area 24 (i.e., the ground working roller 26). Since the stator area of the roller drive motor 32 is also rotatably coupled to the rotor area of the roller drive motor 32 via one or more rolling element bearings typically constructed of metal components, such bearing units present in the roller drive motor 32 can also be used as rotary joints of the second pipeline path 86.

Claims

1. A construction machine, comprising at least one system region (24) rotatable about a rotation axis (D) relative to a frame (22) and at least one first electrical unit (78) on the rotatable system region (24), wherein: At least one of the first electrical units (78) is electrically conductively connected to at least one second electrical unit (80) by means of a pipeline connection (82), wherein at least one of the second electrical units (80) is supported outside the rotatable system area (24) relative to the frame (22), characterized in that the pipeline connection (82) includes a first pipeline path (84), wherein the first pipeline path (84) includes at least one sealing device (56), which tightly seals the rotatable system area (24) relative to a non-rotating system area (42) supported by the frame (22).

2. The construction machine according to claim 1, characterized in that: At least one of the sealing devices (56) comprises a slide ring seal (58), wherein the slide ring seal (58) comprises a first slide ring (60) and a second slide ring (62), wherein the first slide ring (60) is supported relative to the rotatable system area (24) and is made of an electrically conductive material, and the second slide ring (62) is supported relative to the non-rotating system area (42) and is made of an electrically conductive material, wherein the first slide ring (60) and the second slide ring (62) are supported relative to each other so as to be rotatable relative to each other around the rotation axis (D) in the direction of the rotation axis (D).

3. The construction machine according to claim 2, characterized in that: The first slip ring (60) is supported radially outward and along a first axial direction relative to the rotatable system area (24) by means of an annular first sealing element (64), and the second slip ring (62) is supported radially outward and along a second axial direction opposite to the first axial direction relative to the non-rotating system area (42) by means of an annular second sealing element (67).

4. The construction machine according to claim 2, characterized in that: The first slide ring (60) has a first axial support area (68), and the second slide ring (62) has a second axial support area (70) axially supported on the first axial support area (68).

5. The construction machine according to claim 4, characterized in that: Each of the first axial support region (68) and the second axial support region (70) includes a radially extending support surface.

6. The construction machine according to claim 4, characterized in that: The first slip ring (60) is supported radially outwardly along a first axial direction relative to a rotatable system area (24) by means of an annular first sealing element (64), and the second slip ring (62) is supported radially outwardly along a second axial direction opposite to the first axial direction relative to a non-rotating system area (42) by means of an annular second sealing element (67), and the first slip ring (60) and the second slip ring (62) are pressed into axial contact with each other by means of the annular first sealing element (64) and the annular second sealing element (67) with their first axial supporting area (68) and second axial supporting area (70).

7. The construction machine according to any one of claims 2 to 6, characterized in that: The first slip ring (60) is electrically conductively connected to at least one of the first electrical units (78) by means of a first connecting line (88), and the second slip ring (62) is electrically conductively connected to at least one of the second electrical units (80) by means of a second connecting line (92).

8. The construction machine according to claim 7, characterized in that: The first connecting pipeline (88) is conductively connected to the first slip ring (60) by material connection and / or clamping and / or threaded connection, and / or the second connecting pipeline (92) is conductively connected to the second slip ring (62) by material connection and / or clamping and / or threaded connection.

9. The construction machine according to claim 7, characterized in that: The first connecting pipeline (88) is conductively connected to the first slip ring (60) by welding and / or clamping and / or threading, and / or the second connecting pipeline (92) is conductively connected to the second slip ring (62) by welding and / or clamping and / or threading.

10. The construction machine according to any one of claims 1 to 6, characterized in that: The line connection (82) comprises a second line path (86), wherein the second line path (86) comprises at least one bearing unit (38, 40) which supports a rotating system region (24) rotatably about the rotation axis (D) relative to a non-rotating system region (42) supported by a frame (22).

11. The construction machine according to claim 10, characterized in that: At least one of the bearing units (38, 40) comprises a rolling element bearing having a bearing outer ring (72) made of an electrically conductive material, a bearing inner ring (74) made of an electrically conductive material, and a plurality of rolling elements (76) made of an electrically conductive material and supported on the bearing outer ring (72) and the bearing inner ring (74).

12. The construction machine according to claim 10, characterized in that: At least one of the bearing units (38, 40) is electrically conductively connected to at least one of the first electrical units (78) by means of a third connecting line (96), and at least one of the bearing units (38, 40) is electrically conductively connected to at least one of the second electrical units (80) by means of a fourth connecting line (98).

13. The construction machine according to claim 12, characterized in that: The third connecting line (96) includes at least one electrically conductive, supporting structural element (36) of the rotatable system region (24).

14. The construction machine according to claim 13, characterized in that: At least one of the bearing units (38, 40) is supported radially and / or axially on at least one electrically conductive, supporting structural element (36).

15. The construction machine according to claim 10, characterized in that: The second pipeline path (86) includes a roller drive motor (32).

16. The construction machine according to any one of claims 1 to 6, characterized in that: A non-rotating system region (42) is supported on the machine frame (22) by means of a plurality of elastic, electrically insulating suspension elements.

17. The construction machine according to any one of claims 1 to 6, characterized in that: At least one of said first electrical units (78) comprises an electrical energy consumer, and / or at least one of said second electrical units (80) comprises a power source.

18. The construction machine according to claim 17, characterized in that: The electrical energy consumption device comprises a sensor and / or a transmitter unit, and / or the power source comprises a battery and / or a generator.

19. The construction machine according to any one of claims 1 to 6, characterized in that: The rotatable system area (24) comprises a floor processing roller (26).

20. The construction machine according to claim 19, characterized in that: A volume (53) containing an unbalance device (48) having at least one unbalanced mass (50, 52) rotatable about an unbalanced rotation axis (U) is tightly sealed in a floor processing roller (26) by at least one sealing device (56).

21. The construction machine according to any one of claims 1 to 6, characterized in that: The construction machine is a ground compactor.

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