Mobile work machine

Abstract

The invention relates to a mobile working machine (10) comprising a vehicle frame (12), a cab (14) arranged on top of the vehicle frame (12), a connection structure (16) arranged between the cab (14) and the vehicle frame (12) allowing limited movement between the cab (14) and the vehicle frame (12), at least one articulated tilt joint (18) arranged between the connection structure (16) and the cab (14), the cab (14) being tiltable relative to the articulated tilt joint into a maintenance position, an actuator (22) for tilting the cab (14) relative to the articulated tilt joint (18) into the maintenance position, a support member (72) connected to the vehicle frame (12) or the connection structure (16) on one side of the cab (14) for forming a support member of the actuator (22), and a play structure (42) for enabling free movement of the actuator (22) when the cab (14) is moved relative to the vehicle frame (12), wherein the actuator (22) is arranged between the support member (72) and the cab (14) on one side of said cab (14) substantially perpendicular to the direction of movement between the cab (14) and the vehicle frame (12) allowed by the connection structure (16) and substantially transverse to the articulated tilt joint (18) in order to generate a torque substantially perpendicular to the axis of rotation of said articulated tilt joint (18).

Description

Technical Field

[0001] This invention relates to a mobile work machine, which includes...

[0002] Frame, The driver's cabin is located on top of the chassis. At least one articulated tilting joint is arranged between the vehicle frame and the driver's cab, and the driver's cab is tiltable to a maintenance position relative to the articulated tilting joint. An actuator for tilting the cockpit relative to the hinged tilt joint to a maintenance position, and A support member, which is connected to the frame or to a connecting structure on one side of the cockpit, for forming a support member for an actuator, wherein the actuator is arranged on one side of the cockpit, between the support member and the cockpit, so as to be substantially transversely arranged with the hinged tilt joint in order to generate a torque substantially perpendicular to the axis of rotation of the hinged tilt joint. Background Technology

[0003] Figure 1 illustrates a Buffalo mobile work machine 10, known in the prior art and more specifically a forestry tractor, manufactured by Ponsse. The mobile work machine 10 includes a frame 12 and a cab 14, which is suspended on top of the frame 12 via a connecting structure 16 visible in Figures 2a-2c. As shown in Figures 2a-2c, the cab 14 is hinged on one side of the frame 12 to a support element 24 belonging to the connecting structure 16 via a hinged tilt joint 18, and releasably attached to another support element 24 on the other side of the frame 12 via a locking device 20. When the locking device 20 is unlocked, the cab 14 can be tilted relative to the hinged tilt joint 18 from an operating position to a tilted maintenance position and back again by means of an actuator 22. In this case, the actuator 22 is a hydraulic cylinder, which is vertically oriented and supported between the cab 14 and the frame 12 below the cab 14.

[0004] The problem with this type of solution is that the actuator 22, vertically positioned below the cab 14, occupies space below the cab 14, which is particularly problematic for battery-powered work machines. Another issue is that vertical movement hinders the movement of the suspension structure, which acts as a shock absorber between the cab and the frame. The simultaneous back-and-forth movement of the cylinder also creates a "pumping" effect on the hydraulic oil in the work machine's hydraulic system. Summary of the Invention

[0005] The object of this invention is to provide a mobile work machine that is simpler than existing mobile work machines, wherein the actuator for tilting the cab does not occupy space below the cab and does not hinder the vibration damping operation of the cab. The characteristic features of the invention are set forth in the appended claim 1.

[0006] The objective of the mobile work machine according to the invention can be achieved by a mobile work machine comprising: a frame; a cab disposed on top of the frame; a connecting structure arranged between the cab and the frame and allowing limited movement between the cab and the frame; and at least one hinged tilting joint arranged between the connecting structure and the cab, and the cab being tiltable to a maintenance position relative to the hinged tilting joint. The mobile work machine further comprises: an actuator for tilting the cab about the hinged tilting joint to the maintenance position; and a support member connected on one side of the cab to the frame or to the connecting structure to form a support member for the actuator. The actuator is arranged on one side of the cab between the support member and the cab, substantially perpendicular to and substantially transverse to the direction of movement between the cab and the frame allowed by the connecting structure, so as to provide a torque substantially perpendicular to the axis of rotation of the hinged tilting joint. The work machine also includes a clearance structure for allowing the actuator to move freely when the cab moves relative to the frame.

[0007] Surprisingly, the cockpit tilt is achieved using actuators that are horizontal rather than vertical and positioned on one side of the cockpit, leaving the lower part of the cockpit unobstructed. Furthermore, the actuators, positioned substantially parallel to the plane of the chassis, move significantly less during cockpit movements permitted by the connecting structure. The damping effect of the actuators is largely or completely eliminated by the clearance structure, as the actuators can move freely within the limited flexibility of the clearance structure, thus enabling unobstructed, limited movement between the cockpit and the chassis. In other words, the connecting structure is a flexible connection structure.

[0008] In other words, the actuators are arranged substantially perpendicular to the direction of movement of the cockpit relative to the frame permitted by the connecting structure.

[0009] In the context of this invention, a support member refers to a portion of a forestry machine for attaching an actuator to the opposite end of the cab. This point can be part of the frame, such as a hole in the frame, although similarly it can also be a separate element attached to the frame or part of a connection structure located between the cab and the frame.

[0010] In the context of this invention, a maintenance position refers to a position where the floor of the cockpit is at an angle substantially relative to the plane formed by the vehicle frame.

[0011] Preferably, the connection structure is a flexible damping structure. In the context of this invention, a flexible damping structure refers to an active or passive, or both, damping and suspension mechanism, which includes structures, mechanisms, and actuators that can be used between the cab and the frame to connect the cab to the frame, allowing the cab to move within a limited range of motion. A substantially horizontally arranged actuator is particularly advantageous for damping structures because actuators according to the prior art (which are arranged substantially along the direction of suspension movement) are partially disadvantageous as dampers, impairing the independent role of the connection structure in suppressing shocks and vibrations in the cab. Because damping allows cab movement, the length of the cylinder (connecting the cab and frame) as an actuator varies by as much as 100 mm-200 mm, causing the actuator to pump hydraulic oil, which must later be compensated for. In the solution according to the invention, the damping effect caused by the actuator that hinders the movement of the cab connection structure is therefore minimal or nonexistent.

[0012] In the context of this invention, a damping structure refers to a separate structure that suppresses shocks, such as a hydraulic or pneumatic damping structure, which differs from vibration damping structures based on temporary deformation, such as bushings between articulated joints.

[0013] Preferably, the hinged tilting joint is arranged between the connecting structure and the cockpit. Therefore, during tilting, the connecting structure is not affected by the load of the cockpit, which could cause partial deformation of the connecting structure.

[0014] In the context of this invention, according to the definition of the limited movement allowed by arranging the actuator substantially parallel to the plane formed by the vehicle frame or substantially perpendicular to the connecting structure, it means that the angle of the actuator relative to the plane of the vehicle frame or relative to the vertical direction of the movement between the cockpit and the vehicle frame allowed by the connecting structure is at most 30°, preferably less than 15°, and most preferably between 0° and 10°, such that the movement of the cockpit relative to the vehicle frame does not cause significant movement of the actuator in the longitudinal direction, which could impair the operation of the connecting structure.

[0015] The plane formed by the frame refers to the plane formed between the upper surfaces of the two parallel frame beams, that is, the direction perpendicular to the vertical direction of the work machine.

[0016] In the context of this invention, the location of the support member on the cockpit side means that the support member is either located next to the cockpit in the longitudinal direction of the vehicle frame, or preferably on the front or rear side of the cockpit. In other words, the actuator is arranged outside the surface area of ​​the cockpit on the front, rear, or one side surrounding the cockpit.

[0017] More than one actuator may also be provided for tilting the cockpit. Preferably, there are a total of two actuators, one of which is located on one side of the cockpit.

[0018] In particular, the location on the front or rear side of the cockpit allows for the implementation of support structures that do not obstruct maintenance work performed below the cockpit when the cockpit is tilted to a maintenance position.

[0019] According to one embodiment, the support member is a frame structure that can be attached to the frame to support the actuator. This type of structure allows the actuator to be raised a distance relative to the hinged tilt joint, which increases the lever arm of the force generated by the actuator.

[0020] Preferably, the frame structure is arranged on the front or rear side of the cab, or both, along the direction of travel of the mobile forestry machinery. If two actuators are used to tilt the cab, the frame structure needs to be arranged on both sides.

[0021] In the context of this invention, the plane of the frame refers to the plane formed between the upper surfaces of beams belonging to the frame and extending along the longitudinal direction of the mobile work machine. Preferably, the longitudinal beams are connected by additional transverse beams to form a closed frame structure.

[0022] Preferably, the axis of rotation of the hinged tilting joint is located in the longitudinal direction of the mobile work machine's frame. Therefore, the cab can tilt in the lateral direction of the mobile work machine.

[0023] The connection structure may include four support elements to suppress impacts or vibrations, or both. Therefore, it is preferable to have one support element at each corner of the cockpit.

[0024] Preferably, each support element includes a guide element, a spring element, and a damping element.

[0025] Preferably, each support element has a first end and a second end, and each support element includes a first attachment element for attaching the cab of the mobile work machine to the first end of the support element and a second attachment element for attaching the frame of the mobile work machine to the second end of the support element. The support element also includes a spring element or a damping element, or both, mechanically connected between the first end and the second end of the support element. This type of connection structure allows for the implementation of a flexible support structure for the cab, which, combined with actuators arranged substantially parallel to the plane of the frame, provides good operational comfort.

[0026] The support element also preferably includes a guide element comprising a sliding guide and a support arm disposed within the sliding guide. The sliding guide and the support arm are configured to move relative to each other.

[0027] Alternatively, the support elements can be different from each other, for example, each corner may have a spring element while the damping elements are arranged differently. The number of damping elements may also differ from that of the spring elements, with the damping elements arranged in different positions than the spring elements.

[0028] Preferably, the base structure of the cockpit is substantially polygonal, wherein the polygon has at least four corners, and support elements are arranged at or near the four corners of the polygon.

[0029] Preferably, the guide element has two opposing ends, wherein one end is on the sliding guide and the other end is on the support arm, and wherein one end is mechanically connected to a first end of the support element and the other end is mechanically connected to a second end of the support element.

[0030] In the context of this invention, a clearance structure refers to a structure that allows free movement of the actuator as the cockpit moves relative to the chassis, without producing significant damping of the actuator. Therefore, a clearance structure is a structure in which the free or finite movement of a portion generates clearance. Thus, a clearance structure does not refer to bushings between hinge joints or other structures that generate clearance through reversible deformation. With the aid of a clearance structure, a significantly larger clearance movement length than that of a vibration damping structure is achieved.

[0031] The clearance structure allows for a free travel of 2 mm to 20 mm, preferably 4 mm to 10 mm. This is large enough to eliminate the damping effect of the actuator when it is positioned substantially parallel to the plane of the frame (i.e., substantially horizontal when the work machine is operating on a flat surface), so that the length of travel of the actuator during the suspension action of the connecting structure is very small compared to that of a vertical actuator according to the prior art.

[0032] In other words, the actuator is advantageously positioned substantially perpendicular to the support element.

[0033] According to a preferred second embodiment, the clearance structure is integrated as part of an actuator, which is a hydraulic cylinder actuator that is hingedly attached between the support member and the cockpit. As an integral structure, the clearance structure does not produce any clicking or other noise when it moves in response to the suspension.

[0034] Preferably, the hydraulic cylinder actuator includes a cylinder body, a piston rod, and a piston disposed on the piston rod to allow sliding along the piston rod, wherein the slidably disposed piston forms a clearance structure. Therefore, the attachment of the hydraulic cylinder actuator between the vehicle frame and the cab can be implemented by means of an attachment having a fixed hinge point.

[0035] Preferably, the hydraulic cylinder actuator further includes: a sliding surface comprising a first end and a second end and disposed on a piston rod for a slidable piston; a push shoulder disposed on the piston rod at the first end of the sliding surface for transmitting force to the piston when the piston is at the first end of the sliding surface; and a stop disposed on the piston rod at the opposite second end of the sliding surface relative to the push shoulder. This configuration enables limited free movement of the piston along the piston rod and the generation of force in two directions of the hydraulic cylinder actuator.

[0036] In other words, in the embodiments described above, the clearance is in the longitudinal direction of the cylinder and has a magnitude sufficient to compensate for the movement of the cylinder caused by the limited movement of the connecting structure between the cab and the frame, so that the cylinder does not pump the hydraulic oil.

[0037] Preferably, the hydraulic cylinder actuator further includes a stop shoulder disposed on the cylinder body portion to stop the movement of the piston rod before it contacts the rear end wall belonging to the cylinder body portion. This structure prevents the piston from stopping upon reaching the rear end wall of the cylinder body, in which case the hydraulic cylinder actuator cannot effectively generate force in the opposite direction when it begins to move.

[0038] According to the third embodiment, the clearance structure is a slot arranged in the vehicle frame or cockpit, to which the actuator is attached. A slot is a very simple way to implement a clearance structure; however, as an external structure of the actuator, the use of a slot can cause knocking and noise.

[0039] Preferably, the actuator is a hydraulic cylinder actuator, which is hinged between the vehicle frame and the cab via a slot. When using a slot, the hydraulic cylinder actuator can be a conventional actuator that does not include a separate clearance structure, because the slot forms the clearance structure.

[0040] As an alternative to hydraulic cylinder actuators, the actuator can be a spindle motor that is articulated between the chassis and the cab via the aforementioned slot. The spindle motor can be driven by an electric motor.

[0041] Preferably, the mobile work machine includes a locking device for locking the cab in an operating position, and a hinged tilting joint is formed on one side of the cab on at least one support element, preferably on two support elements, and the locking device is formed between the cab and a support element independent of the hinged tilting joint, preferably between the cab and two support elements independent of the hinged tilting joint, wherein the locking device is a locking mechanism for disengaging the cab from the two support elements during tilting. By releasing the locking device, the cab can be disengaged from the connecting structure on one side of the frame and tilted relative to the hinged tilting joint by means of an actuator.

[0042] The actuator can be attached to the cockpit at a distance of 15 cm to 100 cm, preferably 20 cm to 40 cm, from the hinged tilting joint to form a lever arm that tilts the cockpit. The actuator is arranged such that the imaginary lever arm of the torque generated by the actuator is substantially perpendicular to the plane of the vehicle frame. Due to this sufficient distance, the actuator, arranged substantially parallel to the plane of the vehicle frame, generates sufficient torque to tilt the cockpit to a maintenance position.

[0043] According to the fourth embodiment, the mobile work machine includes an auxiliary frame as a support member, which connects to the support elements, and an actuator is arranged between the auxiliary frame and the cab. This allows the force of the actuator to be transmitted to the cab. In this embodiment, a clearance structure is not required as part of the mobile work machine; however, even though it can be significantly reduced compared to prior art solutions, the adverse damping and pumping effects caused by the actuator cannot be completely eliminated.

[0044] Preferably, the actuator is sized such that when the cab is tilted to the maintenance position, the cab's center of gravity crosses a line perpendicular to the chassis plane and passing through the fulcrum of the hinged tilt joint. Therefore, the actuator does not need to support the weight of the cab during maintenance operations, but rather applies only a slight pulling force to the actuator.

[0045] Preferably, the actuator is articulated between the cockpit and the frame such that the actuator is substantially parallel to the tangent of the trajectory of rotational movement about the articulated tilt joint in all operating positions. In other words, the actuator is substantially parallel to the trajectory of tilting movement of the cockpit in all operating positions, so that its force output is optimal even in the two end positions.

[0046] Preferably, the work machine includes a hydraulic circuit comprising a hydraulic tank, a pump for drawing hydraulic oil from the tank, and hydraulic lines from the hydraulic tank to an actuator for delivering pressurized hydraulic oil and returning the hydraulic oil, wherein the aforementioned actuator, which enables the cockpit to tilt, is part of the hydraulic circuit.

[0047] Preferably, the axis of the hinged tilt joint is parallel to the vehicle frame. Therefore, the cab can tilt laterally, which facilitates maintenance operations.

[0048] Preferably, the mobile work machine is one that includes at least one component requiring maintenance within its frame. In this case, it is important to be able to tilt the cab without actuators located below the cab and within the connecting structure, as this facilitates maintenance of the components within the frame. The component requiring maintenance could be, for example, a battery or any hydraulic component. Attached Figure Description

[0049] The present invention, which is not limited to the embodiments described below, is described in more detail with reference to the accompanying drawings, wherein...

[0050] Figure 1 shows a side view of a mobile work machine according to the prior art. Figure 2a shows a separate front view of the cab and chassis of a mobile work machine in the operating position according to the prior art. Figure 2b shows a separate front view of the cab and chassis of a mobile work machine in a maintenance position according to the prior art. Figure 2c shows a separate axonometric view of the cab and chassis of a mobile work machine in a maintenance position according to the prior art. Figure 3 An axonometric view of the front frame of the mobile work machine according to the invention and the cab supported on the frame by means of a connecting structure are shown. They are separate from the rest of the mobile work machine and have no actuators. Figure 4 A separate isometric view of the support element of the connecting structure is shown. Figure 5a A separate front view of the cab and chassis of a mobile work machine according to a first embodiment of the present invention is shown in the operating position. Figure 5b A separate front view of the cab and chassis of a mobile work machine according to a first embodiment of the present invention is shown in a maintenance position. Figure 5c A separate front view of the cab and chassis of a mobile work machine according to a first embodiment of the present invention is shown in the operating position, without supporting members. Figure 5dA separate front view of the cab and chassis of a mobile work machine according to a first embodiment of the present invention is shown in a maintenance position, with no supporting members. Figure 6a Separate isometric views of the cab and chassis of the mobile work machine according to a first embodiment of the present invention in a maintenance position are shown. Figure 6b A separate axonometric view of the cab and chassis of a mobile work machine according to a first embodiment of the present invention is shown in a maintenance position, without supporting members. Figures 7a-7c The diagram shows cross-sectional views of one embodiment of the actuator in different operating positions when the clearance structure is part of the actuator. Figure 8a and Figure 8b A side view of the structure according to the second embodiment of the clearance structure is shown, when the clearance structure is a slot. Figure 9a A separate front view of the cab and chassis of a mobile work machine according to a fourth embodiment of the present invention is shown in the operating position. Figure 9b A separate front view of the cab and chassis of a mobile work machine according to a fourth embodiment of the present invention is shown in a maintenance position. Detailed Implementation

[0051] Referring to FIG1, the mobile work machine 10 according to the invention is preferably a forestry machine 11, or a forestry tractor 11.1 as shown, although it can also be a logging machine. Although FIG1 shows a mobile work machine 10 according to the prior art, it should be understood that, except for the actuator for tilting the cab and its support method, the mobile work machine 10 according to the invention can completely correspond to the mobile work machine according to the prior art in its main features.

[0052] In this application, a mobile work machine refers to a self-propelled work machine supported on a wheeled or tracked chassis. The work machine preferably also includes an articulated frame joint 17, a tool 78 for handling trees, and a boom assembly or crane 80 for the tool 78. The basic components of the mobile work machine 10 of FIG1 include a frame 12, which includes a front frame portion 13 and a rear frame portion 15 connected by an articulated joint between them, and a cab 14 disposed on top of the frame 12. Compared to the figures, the cab may also be disposed on top of the rear frame portion.

[0053] Figure 3The chassis 12, separate from the rest of the mobile work machine, and the attached cab 14 are shown, without components belonging to the wheeled chassis and actuators for tilting the cab 14. Preferably, the cab 14 is connected to the chassis 12 by means of a connecting structure 16. Actuator 22 is shown in... Figures 5a to 6b The connection structure 16 preferably includes a support element 24 located at a corner 68 of the cab 14, which enables suspended movement of the cab 14 relative to the frame 12 when the mobile work machine is traveling on uneven ground (primarily in forests). Although the wheeled or tracked chassis itself acts as a shock absorber for the mobile work machine, the vibrations and shocks acting on the driver of the mobile work machine can be significantly reduced by means of the connection structure 16 between the frame 12 and the cab 14.

[0054] Figure 4 A method of implementing the support element 24 is shown in more detail. The support element 24 enables both suspension movement between the cockpit and the frame and damping of the suspension movement. Preferably, both the spring and the shock absorber are integrated into the support element along with the sliding element. More specifically, in this embodiment, the support element 24 includes a first end 21 and a second end 23, a first attachment element 26 for attaching the cockpit to the first end 21 of the support element 24, and a second attachment element 28 for attaching the frame to the second end 23 of the support element 24. The support element 24 includes a guide element 30, which includes a sliding guide 32 and a support arm 34 disposed in the sliding guide 32. The sliding guide 32 and the support arm 34 are configured to move relative to each other during suspension movement. The guide element 30 has two opposing ends, one of which is on the sliding guide 32, and the other end is on the support arm 34. One of the opposing ends is mechanically connected to a first end 21 of the support element 24, and the other end is mechanically connected to a second end 23 of the support element 24. The range of motion of the support arm is configured to extend at least beyond the first or second attachment element. The support element 24 also includes: a spring element 36 mechanically connected between the first end 21 and the second end 23 of the support element 24; and a damping element 38 mechanically connected between the first end 21 and the second end 23 of the support element 24.

[0055] The support element 24 belonging to the connection structure 16 may be different from... Figure 4 and Figures 5a to 7bThe structure shown is as illustrated; however, in all embodiments that allow suspension movement, the support elements include guide elements, spring elements, and damping elements, which are integrated into a single unit or supported separately, directly or indirectly, between the cockpit and the frame. Alternatively, the connection structure can be achieved by means of articulated tilting joints, without the need for damping support elements.

[0056] Figure 5a and Figure 5c An embodiment of the operating position of the cab 14 in a first embodiment of the mobile work machine according to the invention is shown. An actuator 22 is connected to one side of the cab 14 so as to be substantially parallel to and transverse to the plane formed by the frame 12, in order to generate a torque substantially perpendicular to the axis of rotation of the hinged tilt joint 18. More specifically, in this embodiment, a separate support member 72 is attached to the frame 12 on one side of the cab 14, and the actuator 22 is attached to the support member 72 at one end and to the cab 14 at the other end. In this case, "on one side" preferably means as... Figure 5a , Figure 5b and Figure 6a The position shown is located in front of the cab 14 in the longitudinal direction of the frame 12. This is a particularly advantageous position for the support member 72, as it does not obstruct maintenance work performed in the lateral direction of the frame 12. Furthermore, there is generally more space in front of the cab than in the rear. Figure 5c and Figure 5d The position of actuator 22 is shown more precisely, with support member 72 not shown.

[0057] In other words, in this embodiment, the support member 72 includes legs 73 attached to the frame 12 and lateral support members 75 arranged between the legs, such as... Figure 6a As shown. These features enable the formation of a fulcrum for the actuator 22 on one side of the cockpit 14 at a sufficient distance from the hinged tilt joint 18, such that the actuator 22 is arranged such that its longitudinal direction is substantially parallel to the tangent of the arc of rotation of the cockpit 14 around the hinged tilt joint.

[0058] like Figure 5a , Figure 5b and Figure 6a As shown, according to the preferred first embodiment, the support member 72 is attached to the frame 12, and as... Figure 5cAs shown, the actuator 22, which is hinged to the support member 72, extends such that the end of the actuator 22 forms the support member 72 at a distance d from the hinged tilt joint 18. In other words, the lever arm L of the actuator 22, which rotates the cockpit about the pivot point of the hinged tilt joint 18, is preferably the same length as the distance d. The length of the distance d can be 15 cm to 100 cm, preferably 20 cm to 40 cm, so that the force output required from the actuator remains moderate, while on the other hand, the support member does not need to be too high. Furthermore, the lever arm L is preferably substantially perpendicular to the plane of the vehicle frame. Figure 5b and Figure 5d The cockpit 14 is shown tilted to the maintenance position.

[0059] Preferably, the hinged inclined joint 18 is as follows: Figure 6a and Figure 6b As shown, a fork-shaped attachment element 74 is formed on one side of the frame 12 of the mobile work machine, at the upper end of two rows of support elements 24, and on the other side. For example, a lug 76 belonging to the base of the cab 14 can be fixed to the fork-shaped attachment element by means of a pin. The tilt axis of the hinged tilt joint 18 is preferably in the longitudinal direction of the mobile work machine 10.

[0060] In the mobile work machine according to the invention, the actuator movement caused by the suspension of the cab and occurring along the longitudinal direction of the actuator is much smaller than that of the prior art solution, in which the longitudinal direction of the actuator is substantially the same as the direction of the suspension movement of the connecting structure. In the simplest embodiment, the length of this movement causes a change in volume, such that when the actuator is a hydraulic cylinder, hydraulic oil must be transferred from the cylinder to the tank and pumped back. However, the volumetric flow rate is significantly lower than that of the prior art solution, and the problem is not as pronounced as that of the prior art solution. However, preferably, the mobile work machine according to the invention also includes a clearance structure for the actuator, which enables the movement of the actuator during the suspension movement of the cab, wherein ideally the actuator length does not change.

[0061] Figures 5a-6b The embodiments illustrate a first embodiment of the clearance structure, wherein the actuator is preferably a hydraulic cylinder actuator, the actuator comprising... Figures 7a-7c The integrated clearance structure 42 is shown. When using the integrated clearance structure, the hinge points of the actuator 22 on the cockpit 14 and on the support member 72 can be fixed in place, as shown. Figures 5a-6b As shown.

[0062] Figures 7a-7c An implementation of a first embodiment of the clearance structure 42 is shown, which is integrated as part of the cylinder actuator 44. Figure 7aThe so-called floating suspension position of the cylinder actuator 44 is shown, in which the attachment points 45 of the cylinder actuator 44 can move relative to each other, that is, the length of the cylinder actuator can be changed without causing a change in the volume of the cylinder actuator 44. Figure 7b This further illustrates the position where the cylinder actuator 44 raises the cockpit from the operating position to the maintenance position. Figure 7c The position where the cylinder actuator 44 pulls the cockpit from the maintenance position to the operating position is shown.

[0063] Preferably, the maintenance position is such that the center of gravity G of the cockpit 14 moves to a position in the lateral direction of the frame. Figure 5a and Figure 5b The other side of the hinged tilt joint 18 shown allows the actuator 22 to be substantially unstressed during maintenance and enables the power unit of the mobile work machine to be shut down. The actuator 22 is also required to operate when the cab rotates from the maintenance position to the operating position, thereby moving the center of mass G of the cab 14 from one side of the pivot point of the hinged tilt joint 18 to the other.

[0064] like Figures 7a-7c As shown, the cylinder actuator 44 preferably includes a cylinder body 46, a piston rod 48, and a piston 50 disposed on the piston rod 48 so as to be able to slide along the piston rod 48 with a limited stroke, wherein the slidably disposed piston 50 forms a clearance structure 42. Figure 7a As shown, piston 50 can move along piston rod 48 with a limited stroke, such that during cockpit suspension actuation, the small movement of the attachment point 45 of cylinder actuator 44 formed on piston rod 48 relative to the attachment point 45 of cylinder body portion 46 only results in movement of piston rod 48 relative to piston 50, but not movement of piston 50 relative to cylinder body portion 46. This is called free stroke, which does not cause significant volume changes in the cylinder or movement of pumped hydraulic oil.

[0065] More specifically, the piston 50 achieves a limited free stroke along the piston rod 48 through the sliding surface 52, the push shoulder 58, the stop 60, and the stop shoulder 62. The cylinder actuator 44 preferably includes the sliding surface, the push shoulder, the stop, and the stop shoulder. The sliding surface 52 includes a first end 54 and a second end 56 and is arranged on the piston rod 48 for the sliding piston 50. The sliding surface 52 can act as a sliding bearing; it can be formed on the piston rod 48 by turning or chrome plating, and preferably includes: a sliding strip to enable the piston 50 to slide; and a seal for sealing the piston 50 on the piston rod 48. The piston 50 further preferably includes a sliding ring and a seal on both its inner and outer surfaces.

[0066] The piston's free stroke can be 2 mm to 20 mm, preferably 5 mm to 10 mm, which means that the sliding surface 52 is 2 mm to 20 mm longer than the length of the piston 50 in the longitudinal direction of the piston rod 48.

[0067] The push shoulder 58 is further formed in the piston rod 48 at the first end 54 of the sliding surface 52 so that when the piston 50 is at the first end 54 of the sliding surface 52 (e.g. Figure 7b As shown, when the cockpit moves from the operating position to the maintenance position, force is transmitted to the piston 50. The stop 60 is then formed on the piston rod 48 at the second end 56 opposite the push shoulder 58 of the sliding surface 52, as... Figure 7c As shown, this enables the output of force from the cylinder block actuator 44 when the cockpit is moved from the maintenance position to the operating position. The stop 60 may be a washer attached to the piston rod 48 by means of, for example, a threaded sleeve or weld 71.

[0068] A stop shoulder 62 is formed in the cylinder block portion 46 to stop the movement of the piston rod 48 before it contacts the rear wall 64 belonging to the cylinder block portion 46. Thus, force can be generated at the end position of the cylinder block actuator 44 (where the piston rod 48 is as close as possible to the rear wall 64).

[0069] Including this application Figures 7a to 7c The cylinder actuator with the clearance structure shown can also be used independently of the working machine according to the invention for completely different applications.

[0070] Figure 8a and Figure 8b A second alternative embodiment of the clearance structure 42 is shown, in which the hinged connection of one end of the actuator 22 is achieved via a slot 66 in the connection of the actuator 22. In this embodiment, for example, a conventional hydraulic cylinder or even a linear actuator (such as a combination of a lead screw and an electric motor) can be used. Figure 8a and Figure 8b In this configuration, slot 66 is grounded and connected to the cockpit 14, while the second end of actuator 22 is connected to frame 12 via a conventional circular opening that fixes the position of the second end. Alternatively, slot 66 of clearance structure 42 can also be implemented in conjunction with frame 12 or some similar structure, with actuator 22 hinged to the frame or similar structure at the opposite end relative to cockpit 14. Figure 8a and Figure 8bAs shown, due to the range of motion of the connecting structure, as the cab 14 moves relative to the frame, the attachment point of the actuator 22 in the slot 66 can move from one end of the slot 66 to the other, thus the length of the actuator 22 can remain constant. Only when the lateral movement of the cab 14 exceeds the length of the slot 66 does the movement of the cab 14 relative to the frame 12 begin to change the length of the actuator 22 and cause a movement deceleration force in the manner of a shock absorber.

[0071] Figure 8a and Figure 8b The directions of movement shown (which are actually more of a tilt of the cockpit than a straight lateral translation) are for illustrative purposes only.

[0072] Figure 9a and Figure 9b A fourth embodiment of the mobile work machine according to the invention is shown, in which there is no separate clearance structure for the actuator 22. In this case, the mobile work machine includes an auxiliary frame 40 that connects the support elements 24 belonging to the connecting structure 16. The auxiliary frame 40 preferably includes a closed frame structure substantially parallel to the plane of the frame 12 and a support member 72 substantially perpendicularly connected to the closed frame structure. This type of implementation also allows for the arrangement of actuators for tilting the cab 14 such that the actuator 22 is substantially parallel to the plane of the frame 12 and located on one side of the cab 14, leaving the lower side of the cab 14 unoccupied, allowing access to the object being maintained. Furthermore, the actuator 22, mounted substantially parallel to the plane of the frame 12, requires a significantly small travel length during cab suspension operation, which significantly reduces the damping and pumping effect of the actuator. The purpose of the auxiliary frame 14 is to connect the support elements 24 to each other so that the actuator 22 does not have to be directly connected to the frame 12, but can be connected to the auxiliary frame 14.

[0073] Advantageously, in the mobile work machine according to the invention, the requirements for the actuator regarding length and travel speed are significantly reduced compared to those for similar actuators in mobile work machines according to the prior art. In actuators according to the prior art (which are substantially perpendicular to the plane of the frame), the travel speed may be as high as 50 cm / s, while in the mobile work machine according to the invention, the corresponding speed can be 0.5 cm / s, because the travel distance required along the plane of the frame during the suspension operation of the cab is significantly smaller.

Claims

1. A mobile work machine (10), comprising: Frame (12) The driver's cabin (14) is located on top of the frame (12). At least one hinged tilt joint (18) is arranged between the frame (12) and the cockpit (14), the cockpit (14) being able to tilt to a maintenance position relative to the hinged tilt joint (18). An actuator (22) for tilting the cockpit (14) relative to the hinged tilt joint (18) to the maintenance position, and A support member (72) connected to the frame (12) or to a connecting structure (16) on one side of the cab (14) to form a support point for the actuator (22), wherein the actuator (22) is arranged on the side of the cab (14) between the support member (72) and the cab (14) to be substantially transverse to the hinged tilt joint (18), thereby generating a torque substantially perpendicular to the axis of rotation of the hinged tilt joint (18), characterized in that the mobile work machine (10) further includes: The connecting structure (16), which is arranged between the cockpit (14) and the frame (12), allows limited movement between the cockpit (14) and the frame (12), and A clearance structure (42) is provided to allow the actuator (22) to move freely when the cockpit (14) moves relative to the frame (12). And the actuator (22) therein is arranged substantially perpendicular to the direction of movement between the cockpit (14) and the frame (12) allowed by the connection structure (16).

2. The mobile work machine according to claim 1, characterized in that, The connection structure (16) includes four support elements (24) that dampen impacts, vibrations, or both.

3. The mobile work machine according to claim 2, characterized in that, Each support element (24) has a first end (21) and a second end (23), and each support element (24) includes: A first attachment element (26) is used to attach the cockpit (14) to the first end (21) of the support element (24). The second attachment element (28) is used to attach the frame (12) to the second end (23) of the support element (24), and A spring element (36) or a damping element (38), or both a spring element (36) and a damping element (38), is mechanically connected between the first end (21) of the support element (24) and the second end (23) of the support element (24).

4. The mobile work machine according to claim 1, characterized in that, The clearance structure (42) is an integral part of the actuator (22), which is a hydraulic cylinder actuator (44) that is hinged between the support member (72) and the cockpit (14).

5. The mobile work machine according to any one of claims 1-4, characterized in that, The clearance structure (42) allows the actuator (22) to move freely for 2 mm to 20 mm, preferably 4 mm to 10 mm.

6. The mobile work machine according to claim 4, characterized in that, The hydraulic cylinder actuator (44) includes a cylinder body (46), a piston rod (48), and a piston (50) arranged on the piston rod (48) to be able to slide along the piston rod (48) with a limited range of movement, wherein the slidably arranged piston (50) forms the clearance structure (42).

7. The mobile work machine according to claim 6, characterized in that, The hydraulic cylinder actuator (44) further includes: A sliding surface (52) includes a first end (54) and a second end (56), and the sliding surface (52) is arranged on the piston rod (48) for the sliding piston (50). A push shoulder (58) is arranged on the piston rod (48) at the first end (54) of the sliding surface (52) to transmit force to the piston (50) when the piston (50) is at the first end (54) of the sliding surface (52), and A stop (60) is arranged on the piston rod (48) at the second end (56) of the sliding surface (52) opposite to the push shoulder (58).

8. The mobile work machine according to claim 7, characterized in that, The hydraulic cylinder actuator (44) also includes a stop shoulder (62) disposed on the cylinder body portion (46) to stop the movement of the piston rod (48) before it contacts the rear end wall (64) belonging to the cylinder body portion (46).

9. The mobile work machine according to claim 1 or 5, characterized in that, The clearance structure (42) is a slot (66) arranged in the frame (12) or in the cockpit (14), and the actuator (22) is attached to the slot (66), wherein the actuator (22) is a linear actuator.

10. The mobile work machine according to any one of claims 2-9, characterized in that, The mobile work machine (10) includes a locking device (20) for locking the cab (14) in an operating position, and the hinged tilt joint (18) is formed on one side of the cab (14) on at least one support element (24), preferably on two support elements (24), and the locking device (20) is formed between the cab (14) and a support element (24) independent of the hinged tilt joint (18), preferably between the cab and the two support elements (24), wherein the locking device (20) is a locking mechanism for disengaging the cab (14) from the two support elements (24) during tilting.

11. The mobile work machine according to any one of claims 1-10, characterized in that, The actuator (22) is attached to the cockpit (14) at a distance (d) from the hinged tilt joint (18), the distance being 15 cm-100 cm, preferably 20 cm-40 cm, in order to form a lever arm that tilts the cockpit (14), and the actuator (22) is arranged such that the imaginary lever arm (L) of the torque generated by the actuator (22) is substantially perpendicular to the plane of the frame (12).

12. The mobile work machine according to claim 1, characterized in that, The mobile work machine (10) includes an auxiliary frame (40) as the support member (72), the auxiliary frame connecting the support elements (24) together, and the actuator (22) being arranged between the auxiliary frame (40) and the cab (14).

13. The mobile work machine according to any one of claims 1-12, characterized in that, The mobile work machine (10) is a mobile work machine (11) that includes at least one component requiring maintenance within the frame (12).

14. The mobile work machine according to any one of claims 1-13, characterized in that, The actuator (22) is hinged between the frame (12) and the cockpit, such that the actuator (22) is substantially tangential to the trajectory of rotational movement about the hinged tilt joint (18) in all operating positions.

15. The mobile work machine according to claim 6, characterized in that, The clearance of the clearance structure (42) is along the longitudinal direction of the hydraulic cylinder actuator (44).

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