Linkage arrangement for a work machine

Abstract

The invention relates to a linkage arrangement (10) for a work machine, which linkage arrangement (10) is connectable to a work implement (20). The linkage arrangement comprises a single-boom lifting arm (30) extending along a longitudinal central axis (L) and configured to lift the work implement, and a tilt arrangement (40) having two hydraulically driven arms (42, 52) arranged in parallel and configured to tilt the work implement relative to the single-boom lifting arm. Each of the two hydraulically driven arms is hydraulically driven by a separate hydraulic tilt cylinder (62, 64).

Description

TECHNICAL FIELD

[0001] The present invention relates to a linkage arrangement for a work implement of a work machine. The invention further relates to a work machine comprising such a linkage arrangement, which work machine is typically a wheel loader. BACKGROUND

[0002] Construction or work machines are configured to perform work by means of a work implement. For example, a work machine can be configured to lift, move and dump a load. One example of such a work machine is a wheel loader, such as an articulated wheel loader.

[0003] A wheel loader typically comprises a work implement, such as a bucket, configured to handle a load. In order to move the work implement relative to the frame of the work machine, the work machine is equipped with a linkage arrangement. The linkage arrangement comprises a load carrying structure, such as a lift arm configured to lift the work implement. Furthermore, the work machine can comprise some kind of connector mechanism or coupling configured to connect the work machine to various types of work implements.

[0004] The linkage arrangement has a large enclosure arranged in front of the operator's cab and in the centre of the work machine, resulting in obstructed view when the operator tries to operate the work implement. The work implement itself can also result in obstructed view. Furthermore, in order to correctly manipulate the work implement, for example in order to tilt the work implement, additional arms and actuators can be required to achieve the correct torque distribution and ideal alignment of the work implement, which further results in obstructed view.

[0005] Hence, there is a trade-off between the driver's good visibility and the work implement's satisfactory functionality. There is therefore a need for an improved linkage arrangement in the industry. SUMMARY

[0006] It is an object of the present invention to at least partly alleviate the drawbacks discussed above in relation to linkage arrangements.

[0007] According to at least a first aspect of the present invention, there is provided a linkage arrangement for a work machine, the linkage arrangement being connectable to a work implement. The linkage arrangement comprises a single-boom lift arm extending along a longitudinal central axis and configured to lift the work implement, and a tilt arrangement having two hydraulically driven arms arranged in parallel and configured to tilt the work implement relative to the single-boom lift arm, wherein each of the two hydraulically driven arms is hydraulically driven by a separate hydraulic tilt cylinder.

[0008] Thus, an improved linkage arrangement is provided in terms of torque distribution and visibility for the operator in relation to the work implement. Furthermore, the linkage arrangement combines parallel alignment with low weight in an advantageous manner. In other words, the configuration of the linkage arrangement provides a specific geometry between the linkage arrangement and the work implement, which has the advantages of a single-boom lift arm (e.g. good visibility in all positions and low weight), and of two hydraulically driven arms arranged in parallel and hydraulically driven individually by respective hydraulic cylinders for tilting arrangement (e.g. torque distribution and parallel alignment). The linkage arrangement can be referred to as a boom loader mechanism. The work implement is typically an implement or attachment configured to perform a work, and can be referred to as an attachment or an attachment device.

[0009] As each of the two hydraulically driven arms is hydraulically driven by a respective hydraulic tilting cylinder, the tilting arrangement can be referred to as being configured to be hydraulically driven by individual hydraulic cylinders.

[0010] According to at least one example embodiment, the linkage arrangement is connectable to the work implement by a coupler. The linkage arrangement can comprise the coupler, or the work implement can comprise the coupler. The coupler typically comprises first attachment means to connect to the single-boom lift arm, and second attachment means to connect to each of the two hydraulically driven arms. According to at least one example embodiment, the coupler is configured to couple the work machine to various types of work implements.

[0011] According to at least one example embodiment, the two hydraulically driven arms are arranged at least partially outside the single-boom lift arm in a direction transverse to the longitudinal central axis.

[0012] Thereby, the configuration of the two hydraulically driven arms arranged in parallel and hydraulically driven individually by individual hydraulic cylinders is further improved in terms of torque distribution and parallel alignment. According to at least one example embodiment, the two hydraulically driven arms are arranged outside the single-boom lift arm in a direction transverse to the longitudinal central axis, such as completely outside the single-boom lift arm. According to at least one example embodiment, each of the two hydraulically driven arms extends along a respective longitudinal arm axis, wherein the two longitudinal arm axes are arranged parallel to the longitudinal central axis of the single-boom lift arm, or at least in parallel vertical planes. Typically, the longitudinal central axis of the single-boom lift arm is arranged between the two longitudinal arm axes.

[0013] According to at least one example embodiment, the single-boom lift arm is at least partially defined by two lateral sides extending on opposite sides of the longitudinal central axis and in the same direction as the longitudinal central axis, wherein the two hydraulically driven arms are arranged outside or at least partially outside the lateral sides on opposite sides of the longitudinal central axis.

[0014] According to at least one example embodiment, the hydraulic tilt cylinder is arranged at least partly outside the single-boom lifting arm in a direction transverse to the longitudinal centre axis.

[0015] Thereby, the construction of two hydraulically driven arms arranged in parallel and hydraulically driven individually by separate hydraulic cylinders is further improved in terms of torque distribution and parallel alignment. According to at least one example embodiment, the two hydraulic tilt cylinders are arranged outside the single-boom lifting arm in a direction transverse to the longitudinal centre axis, such as completely outside the single-boom lifting arm. According to at least one example embodiment, each of the two hydraulic tilt cylinders extends in the same vertical plane as the corresponding aforementioned longitudinal arm axis. Thus, the two hydraulic tilt cylinders can be referred to as arranged in parallel to the longitudinal centre axis of the single-boom lifting arm or arranged in at least a parallel vertical plane. Typically, the longitudinal centre axis of the single-boom lifting arm is arranged between the hydraulic tilt cylinders.

[0016] According to at least one example embodiment, the two hydraulic tilt cylinders are arranged outside or at least partly outside the lateral sides of the single-boom lifting arm and arranged on opposite sides of the longitudinal centre axis.

[0017] According to at least one example embodiment, the hydraulic tilt cylinder is arranged vertically below the longitudinal centre axis of the single-boom lifting arm.

[0018] This arrangement of the hydraulic tilt cylinder improves the torque distribution and the parallel alignment of the tilt arrangement. Furthermore, by arranging the hydraulic tilt cylinder vertically below the longitudinal centre axis of the single-arm crane arm, the visibility for the operator is improved.

[0019] According to at least one example embodiment, each of the two hydraulically driven arms comprises a first end connectable to the work implement and a second end connected to the corresponding hydraulic tilt cylinder.

[0020] The first end of each hydraulic drive arm is arranged on an opposite side of the corresponding second end along the respective longitudinal arm axis. The hydraulic tilt cylinder is configured to transfer its induced motion to the respective second end of the hydraulic drive arm, wherein the induced motion is further transferred via both hydraulic drive arms to their respective first ends to tilt the work implement. In other words, in the vicinity of the first side edge of the single-boom lift arm, a first hydraulic tilt cylinder is arranged and configured to transfer its induced motion to the second end of the first hydraulic drive arm, wherein the first hydraulic drive arm is configured to further transfer the induced motion to its first end, and in the vicinity of a second side of the single-boom lift arm, the second side being arranged on an opposite side of the single-boom lift arm compared to the first side in the transverse direction, a second hydraulic tilt cylinder is arranged and configured to transfer its induced motion to the second end of the second hydraulic drive arm, wherein the second hydraulic drive arm is configured to further transfer the induced motion to its first end.

[0021] According to at least one example embodiment, each of the two hydraulic drive arms comprises an intermediate portion arranged between the respective first end and the second end, wherein each intermediate portion is rotatably coupled to the single-boom lift arm.

[0022] Accordingly, each of the two hydraulic drive arms is supported and arranged rotatably relative to the single-boom lift arm. Accordingly, the torque distribution and parallel alignment of the tilt arrangement is improved.

[0023] According to at least one example embodiment, the intermediate portion is a first intermediate portion, and each of the two hydraulic drive arms comprises a second intermediate portion arranged between the respective first end and the first intermediate portion, wherein the second intermediate portion is rotatably coupled to the single-boom lift arm.

[0024] Accordingly, each of the two hydraulic drive arms is further supported and additionally arranged rotatably relative to the single-boom lift arm. Accordingly, the torque distribution and parallel alignment of the tilt arrangement is improved. For example, each of the second intermediate portions is rotatably coupled to the single-boom lift arm via a respective spacer arm. Such a spacer arm further improves the possibility to transfer motion to the work implement independent of the tilt arrangement of the single-boom lift arm.

[0025] According to at least one example embodiment, the single-boom lift arm is hydraulically driven by a hydraulic lift cylinder.

[0026] Accordingly, the single-boom lift arm is hydraulically driven by a separate hydraulic cylinder compared to the hydraulic drive arms of the tilt arrangement. Accordingly, the possibility of independent motion of the single-boom arm and the tilt arrangement relative to the work implement is improved.

[0027] According to at least one example embodiment, the hydraulic lift cylinder is at least partially arranged in the same horizontal plane as the hydraulic tilt cylinder.

[0028] Thus, a compact or concise arrangement of hydraulic cylinders, i.e. two hydraulic tilt cylinders and a hydraulic lift cylinder, is provided. According to at least one example embodiment, the hydraulic lift cylinder is arranged between the two hydraulic tilt cylinders as seen from a direction transversely across the longitudinal centre axis.

[0029] According to at least one example embodiment, each of the hydraulic drive arms is a link arm comprising at least three straight sub-portions pivotably interconnected to each other.

[0030] Thus, the configuration and torque distribution of the tilt arrangement is improved. Thus, each of the hydraulic drive arms comprises at least three straight sub-portions or three arm portions pivotably interconnected to each other. Typically, the at least three straight sub-portions are pivotably interconnected to each other at respective end portions of said straight sub-portions. For example, each of the hydraulic drive arms comprises a first straight sub-portion having a first end portion connected to the corresponding hydraulic tilt cylinder and having a second end portion arranged along the first straight sub-portion opposite said first end portion, wherein the second end portion is pivotably connected to a respective first end portion of a second straight sub-portion. Further, each of the second straight sub-portions comprises a second end portion arranged along the second straight sub-portion opposite the first end portion, etc. Thus, the second end of each of the hydraulic drive arms is typically comprised in a respective first end portion of the first straight sub-portion and the first end of each of the hydraulic drive arms is typically comprised in a second end portion of the last straight sub-portion, e.g. the third straight sub-portion. According to at least one example embodiment, a respective first intermediate portion is arranged in the first straight sub-portion of the hydraulic drive arm. According to at least one example embodiment, a respective second intermediate portion is arranged in the third straight sub-portion of the hydraulic drive arm. The hydraulic drive arms can be referred to as a hydraulic drive arm arrangement or a hydraulic drive link arm.

[0031] According to at least a second aspect of the present invention, there is provided a work machine comprising a linkage arrangement according to the first aspect of the present invention.

[0032] The effects and features of the second aspect of the present invention are largely analogous to those described above in relation to the first aspect of the present invention. The embodiments mentioned in relation to the first aspect of the present invention are largely compatible with the second aspect of the present invention, some of which are exemplified below.

[0033] According to at least one example embodiment, the work machine comprises a frame having a first attachment portion pivotably connecting the single-boom lift arm to said frame, wherein the hydraulic tilt cylinder is attached to the frame vertically below the first attachment portion. The frame can be referred to as a work machine frame.

[0034] According to at least one example embodiment, the work machine comprises a work implement. Thus, the linkage arrangement is connected to the work implement.

[0035] According to at least one example embodiment, the work machine is a wheel loader. According to at least one example embodiment, the work implement is a bucket.

[0036] Other advantages and features of the present disclosure are disclosed and discussed in the following description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] With reference to the appended drawings, below follows a more detailed description of embodiments of the application cited as examples. In the drawings:

[0038] Figure 1 is a schematic side view of a work machine comprising a linkage arrangement for a work implement according to an example embodiment of the application;

[0039] Figure 2 is a schematic side view of a linkage arrangement and a work implement according to an example embodiment of the application; and

[0040] Figure 3 is a schematic side view of a linkage arrangement and a work implement according to an example embodiment of the application; and Figure 2 is a schematic top view of the linkage arrangement of DETAILED DESCRIPTION

[0041] With reference to Figure 1 , a work machine 1, here embodied as a wheel loader 1, is disclosed to which a linkage arrangement 10 disclosed in the present application is advantageous. However, the linkage arrangement 10 can also be embodied in other types of work machines, such as in e.g. an excavator. The work machine 1 can be an electric work machine, such as a fully electric work machine or a hybrid machine comprising at least one electric motor. Such electric machines can be powered by a rechargeable energy storage system RESS, such as e.g. a battery system or a fuel cell system.

[0042] As seen in Figure 1 , the linkage arrangement 10 is connected to a work implement 20, here a bucket 20. The linkage arrangement 10 comprises a single-boom lift arm 30 configured to lift the work implement 20, and a tilt arrangement 40 configured to tilt the work implement 20 relative to the single-boom lift arm 30. The linkage arrangement 10 will now be described in more detail with reference to Figures 2-3 .

[0043] Figure 2 is a schematic side view of the linkage arrangement 10 connected to the work implement 20 of Figure 1 , while Figure 3 is a schematic top view of the linkage arrangement 10 ofThis is a schematic top view of the same linkage arrangement 10 without the working equipment 20. Figures 2-3 The illustrated embodiments can therefore be used Figure 1 Implemented in operating machinery 1. For example... Figure 1 As shown, the linkage arrangement 10 includes a single-arm lifting arm 30 and an inclined arrangement 40. The single-arm lifting arm 30 extends along the longitudinal central axis L. The single-arm lifting arm 30 is not uniformly straight, but slightly curved, or formed by a finite number of combined straight segments. Therefore, the longitudinal central axis L of the single-arm lifting arm does not form a straight axis, but is an axis composed of a finite number of corresponding combined straight segments, wherein the straight segments are at an angle to each other. Figure 2 In this configuration, a single boom lifting arm 30 is connected to or attached to a work implement 20 and is configured to lift the work implement 20, while an inclined arrangement 40 is connected to or attached to the work implement 20 and is configured to tilt the work implement 20. The inclined arrangement 40 is typically connected to or attached to the work implement 20 vertically above the position where the single boom lifting arm 30 is connected to or attached to the work implement 20.

[0044] Figures 2-3 The inclined arrangement 40 includes two hydraulically driven arms 42 and 52, referred to herein as the first hydraulically driven arm 42 and the second hydraulically driven arm 52. At least in Figure 3 As can be seen, the first and second hydraulic drive arms 42 and 52 are arranged in parallel and on different sides of the single boom lifting arm 30. Furthermore, the tilting arrangement 40 includes two hydraulic tilting cylinders 62 and 64, referred to herein as the first hydraulic tilting cylinder 62 and the second hydraulic tilting cylinder 64. The first hydraulic tilting cylinder 62 is configured to operate the first hydraulic drive arm 42, while the second hydraulic tilting cylinder 64 is configured to operate the second hydraulic drive arm 52, causing the work implement 20 to tilt relative to the single boom lifting arm 30. Therefore, each of the two hydraulic drive arms 42 and 52 is hydraulically driven by a separate hydraulic tilting cylinder 62 or 64.

[0045] like Figure 3 As best seen in the image, in the direction traversing the longitudinal central axis L of T, the first hydraulic drive arm 42 and the second hydraulic drive arm 52 are at least partially arranged outside the single boom lifting arm 30. The single boom lifting arm 30 includes a first connecting portion 32 for connecting or attaching to the working machinery 1 or the frame 3 connected or attached to the working machinery 1 (see [link to relevant documentation]). Figure 1) and the single-boom lift arm 30 comprises a second coupling portion 34, arranged on an opposite side of the single-boom lift arm 30 compared to the first coupling portion 32, along the longitudinal central axis L, the second coupling portion 34 being configured for coupling or attachment to the work implement 20. The single-boom lift arm 30 further comprises an intermediate portion 36, constituting a majority of the total length of the single-boom lift arm 30 along the longitudinal central axis L. The intermediate portion 36 is arranged between the first coupling portion 32 and the second coupling portion 34, e.g. the intermediate portion 36 can extend from the first coupling portion 32 to the second coupling portion 34. As Figure 3 As can be seen in Fig. 3, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic drive arm 42 and the second hydraulic drive arm 52 are arranged outside of at least the intermediate portion 36 of the single-boom lift arm 30. In other words, and according to at least one example embodiment, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic drive arm 42 and the second hydraulic drive arm 52 are arranged outside of at least a majority of the length of the single-boom lift arm 30 (the length defined along the longitudinal central axis L).

[0046] Correspondingly, and according to at least one example embodiment, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic tilt cylinder 62 and the second hydraulic tilt cylinder 64 are at least partially arranged outside of the single-boom lift arm 30. As Figure 3 As can be seen in Fig. 3, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic tilt cylinder 62 and the second hydraulic tilt cylinder 64 are arranged outside of at least the intermediate portion 36 of the single-boom lift arm 30. In other words, and according to at least one example embodiment, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic tilt cylinder 62 and the second hydraulic tilt cylinder 64 are arranged outside of at least a majority of the length of the single-boom lift arm 30 compared to.

[0047] As can be seen in Fig. 3, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic tilt cylinder 62 and the second hydraulic tilt cylinder 64 are arranged outside of at least the intermediate portion 36 of the single-boom lift arm 30. In other words, and according to at least one example embodiment, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic tilt cylinder 62 and the second hydraulic tilt cylinder 64 are arranged outside of at least a majority of the length of the single-boom lift arm 30 compared to. Figure 2 As can be seen in Fig. 3, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic tilt cylinder 62 and the second hydraulic tilt cylinder 64 are arranged outside of at least the intermediate portion 36 of the single-boom lift arm 30. In other words, and according to at least one example embodiment, in a direction transverse to the longitudinal central axis L of the single-boom lift arm 30, the first hydraulic tilt cylinder 62 and the second hydraulic tilt cylinder 64 are arranged outside of at least a majority of the length of the single-boom lift arm 30 compared to.

[0048] The single-boom lift arm 30 can be described as being at least partially defined by two lateral sides 31A, 31B extending on opposite sides of the longitudinal center axis L and in the same direction as the longitudinal center axis L. Accordingly, the first and second hydraulic drive arms 42, 52 are arranged outside the lateral sides 31A, 31B on opposite sides of the longitudinal center axis L. Correspondingly, the hydraulic tilt cylinders 62, 64 are at least partially arranged outside the lateral sides 31A, 31B on opposite sides of the longitudinal center axis L.

[0049] The positioning of the first and second hydraulic drive arms 42, 52 and the first and second hydraulic tilt cylinders 62, 64 relative to the single-boom lift arm 30 and its longitudinal center axis L provides an improved linkage arrangement 10 in terms of torque distribution in relation to the work implement 20 and visibility for the operator.

[0050] As seen in Figure 2 and Figure 3 each of the first and second hydraulic drive arms 42, 52 comprises a first end 43, 53 connectable to the work implement 20 and each of the first and second hydraulic drive arms 42, 52 comprises a second end 44, 54 connected to a corresponding hydraulic tilt cylinder 62, 64. That is, the first hydraulic drive arm 42 comprises a first end 43 connectable to the work implement 20 and the first hydraulic drive arm 42 comprises a second end 44 connected to the first hydraulic tilt cylinder 62. Correspondingly, the second hydraulic drive arm 52 comprises a first end 53 connectable to the work implement 20 and the second hydraulic drive arm 52 comprises a second end 54 connected to the second hydraulic tilt cylinder 64. Furthermore, in the embodiment of Figure 2 and Figure 3 each of the first and second hydraulic drive arms 42, 52 comprises a first intermediate portion 45, 55 arranged between the respective first end 43, 53 and the second end 44, 54. Each first intermediate portion 45, 55 is rotationally coupled to the single-boom lift arm 30. For the first hydraulic drive arm 42, this is shown in Figure 2 as a rotational coupling 45A. A corresponding rotational coupling is arranged on the other lateral side 31B of the single-boom lift arm 30 for the second hydraulic drive arm 52. Furthermore, each of the first and second hydraulic drive arms 42, 52 comprises a second intermediate portion 46, 56 arranged between the respective first end 43, 53 and the first intermediate portion 45, 55. Each second intermediate portion 46, 56 is rotationally coupled to the single-boom lift arm. For the first hydraulic drive arm 42, this is shown in Figure 2The central one is shown as a rotational coupling 46A. A corresponding rotational coupling is arranged on the other lateral side 31 B of the single-boom lift arm 30 for the second hydraulic drive arm 52. As Figure 2 shown, the first hydraulic drive arm 42 is rotationally coupled to the single-boom lift arm by a spacer arm 47. A corresponding spacer arm is arranged on the other lateral side 31 B of the single-boom lift arm 30 for the second hydraulic drive arm 52.

[0051] The single-boom lift arm 30 is hydraulically driven by a hydraulic lift cylinder 32. The hydraulic lift cylinder 32 is arranged along a longitudinal central axis L, as is typically vertically parallel to the single-boom lift arm 30. Further, and as Figure 2 visible, the hydraulic lift cylinder 32 is at least partly arranged in the same horizontal plane as the first and second hydraulic tilt cylinders 62, 64. Thus, the hydraulic lift cylinder 32 is arranged between the first and second hydraulic tilt cylinders 62, 64, as seen in a direction transverse T to the longitudinal central axis L. Thereby, a neat or compact arrangement of the hydraulic cylinders 32, 62, 64 is provided.

[0052] As Figure 2As best shown, each of the first and second hydraulic drive arms 42, 52 is a link arm 42, 52. In the following, the configuration of such a link arm 42, 52 is described with reference to the first hydraulic drive arm, but a corresponding configuration of the second hydraulic drive arm 52 can be assumed as well. The first hydraulic drive arm 42 comprises at least three straight sub- portions 42A, 42B, 42C, here referred to as a first, a second and a third straight sub-portion 42A, 42B, 42C, which are pivotably interconnected to each other. The straight sub-portions 42A, 42B, 42C can be referred to as arm portions 42A, 42B, 42C. The first, the second and the third straight sub-portions 42A, 42B, 42C are pivotably connected to each other at respective end portions of the straight sub-portions 42A, 42B, 42C. For example, the first straight sub-portion 42A comprises a first end portion connected to the first hydraulic tilt cylinder 62, and the first straight sub-portion 42A comprises a second end portion arranged along the first straight sub-portion 42A opposite the first end portion, which second end portion is pivotably connected to a respective first end portion of the second straight sub-portion 42B. Further, the second straight sub-portion 42B comprises a second end portion arranged along the second straight sub-portion 42B opposite the first end portion, which second end portion is pivotably connected to a first end portion of the third straight sub-portion 42C. Thus, the second end 44 of the first hydraulic drive arm 42 is generally comprised in the first straight sub-portion 42A and its first end portion, while the first end 43 of the first hydraulic drive arm 42 is comprised in the third straight sub-portion 42C and its second end portion. In case the first hydraulic drive arm 42 comprises a fourth straight sub-portion arranged after the third straight sub-portion 42C, the first end 43 of the first hydraulic drive arm 42 is generally comprised in the fourth straight sub-portion and its second end portion. Generally, the straight sub-portion of the first hydraulic drive arm 42 arranged closest to or connected with the work implement 20 is referred to as the last straight sub-portion. As can be seen in Figure 2 As can be seen in

[0053] Briefly returning to Figure 1 is shown comprising Figures 2-3The working machine 1 is of the articulated arrangement 10 type and comprises a working implement 20 in the form of a bucket 20. The working machine 1 comprises a frame 3 having a first attachment portion 5 pivotably connecting a single-boom lifting arm 30 to the frame 3. Furthermore, the frame 3 comprises a second attachment portion 7 connecting each of a first hydraulic tilt cylinder 62 and a second hydraulic tilt cylinder 64 to the frame 3. The second attachment portion 7 is arranged vertically below the first attachment portion 5.

[0054] It should be understood that the application is not limited to the embodiments described above and shown in the drawings; on the contrary, a person skilled in the art will realize many changes and modifications within the scope of the appended claims.

[0055] Furthermore, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from an study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

1. A linkage arrangement (10) for a work machine, the linkage arrangement being connectable to a work implement (20), the linkage arrangement comprising: a single-boom lift arm (30) extending along a longitudinal central axis (L) and configured to lift the work implement; and a tilt arrangement (40) having two hydraulically driven arms (42, 52) arranged in parallel and configured to tilt the work implement relative to the single-boom lift arm, wherein each of the two hydraulically driven arms is hydraulically driven by a separate hydraulic tilt cylinder (62, 64), and wherein the hydraulic tilt cylinders are at least partly arranged outside the single-boom lift arm in a direction transverse to the longitudinal central axis.

2. The linkage arrangement of claim 1, wherein, The two hydraulically driven arms are at least partly arranged outside the single-boom lift arm in a direction transverse (T) to the longitudinal central axis.

3. The linkage arrangement of any of claims 1-2, wherein, The hydraulic tilt cylinders are arranged vertically below the longitudinal central axis of the single-boom lift arm.

4. The linkage arrangement of any one of claims 1-2, wherein, Each of the two hydraulically driven arms comprises a first end (43, 53) connectable to the work implement, and a second end (44, 54) connected to the corresponding hydraulic tilt cylinder.

5. The linkage arrangement of claim 4, wherein, Each of the two hydraulically driven arms comprises an intermediate portion (45, 55) arranged between the respective first and second ends, wherein each intermediate portion is rotationally coupled to the single-boom lift arm.

6. The linkage arrangement of claim 5, wherein, The intermediate portion is a first intermediate portion, and each of the two hydraulically driven arms comprises a second intermediate portion (46, 56) arranged between the respective first end and the first intermediate portion, wherein the second intermediate portion is rotationally coupled to the single-boom lift arm.

7. The linkage arrangement of any one of claims 1-2, wherein, The single-boom lift arm is hydraulically driven by a hydraulic lift cylinder.

8. The linkage arrangement of claim 7, wherein, The hydraulic lift cylinder is at least partly arranged in the same horizontal plane as the hydraulic tilt cylinders.

9. The linkage arrangement of any of claims 1-2, wherein, Each of the hydraulic driven arms is a link arm comprising at least three straight sub-portions pivotally interconnected to each other.

10. A work machine (1) comprising a linkage arrangement according to any one of claims 1-9.

11. The work machine according to claim 10, comprising a frame (3) having a first attachment portion (5) pivotably connecting the single-boom lift arm to the frame, wherein the hydraulic tilt cylinders are attached to the frame vertically below the first attachment portion.

12. The work machine according to any one of claims 10-11, further comprising the work implement.

13. The work machine according to any one of claims 10-11, which is a wheel loader.

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