EP3800299A1 - Équipement, en particulier chargeur sur roues - Google Patents

Équipement, en particulier chargeur sur roues Download PDF

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Publication number
EP3800299A1
EP3800299A1 EP20199599.0A EP20199599A EP3800299A1 EP 3800299 A1 EP3800299 A1 EP 3800299A1 EP 20199599 A EP20199599 A EP 20199599A EP 3800299 A1 EP3800299 A1 EP 3800299A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
suspension
attachment
connections
coupling part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20199599.0A
Other languages
German (de)
English (en)
Inventor
Andreas Wimmer
Herbert Ganitzer
Robert Grau
Christian Guter
Thomas Zitterbart
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liebherr Werk Bischofshofen GmbH
Original Assignee
Liebherr Werk Bischofshofen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liebherr Werk Bischofshofen GmbH filed Critical Liebherr Werk Bischofshofen GmbH
Publication of EP3800299A1 publication Critical patent/EP3800299A1/fr
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2275—Hoses and supports therefor and protection therefor

Definitions

  • the present invention relates to an implement, in particular a wheel loader, according to the preamble of claim 1.
  • Hydraulic couplings can also be used for work equipment with a lifting frame with Z-kinematics, as is often used in wheel loaders, in order to be able to attach a hydraulically operated work device or tool, such as a high-tip shovel, to the lifting frame quickly and easily.
  • FIG Figure 1 An example of such a wheel loader 1 known from the prior art is shown in FIG Figure 1 shown.
  • the wheel loader 1 has a hydraulic circuit and a chassis 2 which, in this example, comprises a rear carriage and a front carriage connected to this via an articulated joint.
  • a lifting frame 10 with Z-kinematics is attached to the front end of the vehicle, and a wheel loader shovel 60 is pivotably mounted at its front end.
  • the lifting frame 10 comprises a lifting arm 12, which can be pivoted by means of two hydraulic lifting cylinders 5 and is H-shaped in plan view, with a cross tube 18 forming the H-web.
  • a deflection lever 14 is articulated on the lifting arm 12 and can be pivoted by means of a hydraulic tilting cylinder 6.
  • the deflection lever 14 is articulated to a connecting part 16 (also called a connecting strap) at the front end (ie, facing away from the chassis).
  • the lifting frame 10 further comprises an attachment frame 20, on which an attachment 60 (in this example the wheel loader shovel 60) can be reversibly mounted.
  • the scaffolding 20 is articulated to the front end of the lifting arm 12 and to the end of the connecting part 16 facing away from the deflecting arm 14 about two parallel horizontal axes and can be pivoted by pivoting the deflecting lever 14 relative to the lifting arm 12 by means of the tilting cylinder 6.
  • a hydraulic coupling for producing a hydraulic supply to the attachment 60 can be arranged on the attachment frame 20.
  • the scaffolding can also be a quick coupler.
  • the hydraulic lines are typically attached to the front by means of fixed suspensions or fastenings along the lifting arm and / or the reversing lever End of the lifting arm or brought up to the connecting link, since the latter is pivoted to a lesser extent than the scaffolding. This makes additional hydraulic hoses and connections necessary so that the hydraulic lines can be brought up to and connected to the attachment in a segmented manner, which increases the costs, the maintenance effort and the risk of leaks.
  • the hydraulic hoses must be made long enough so that sufficient hose length is available even in extreme positions of the lifting frame, in particular when the attachment frame or attachment is pivoted completely in and out. This results in hose bulges in less extreme positions that can protrude into the work area and require additional, complex protective measures such as steel hose coils.
  • the hoses' necessarily exposed position in such a case also reduces their service life.
  • the use of pivotable hydraulic connections such as swivel screw connections on the hydraulic coupling is also disadvantageous, since this increases the costs, the maintenance effort and the risk of leaks.
  • the present invention is based on the object of providing an implement with a lifting frame with Z-kinematics, which enables a fast and fully automatic hydraulic connection of an attachment to the hydraulic circuit of the implement.
  • the hydraulic line system of the working device required for this should be constructed simply and inexpensively and should be characterized by a low risk of leakage.
  • the working device according to the invention which is in particular a wheel loader, comprises a hydraulic circuit and a lifting frame with Z-kinematics.
  • the lifting frame comprises a lifting arm, which can be pivoted about a horizontal pivot axis, and a deflection lever which is articulated to a connecting part and which is attached to the lifting arm about a horizontal pivot axis Pivot axis is pivotably articulated.
  • the lifting arm can preferably be pivoted by means of at least one lifting cylinder and the deflection lever by means of at least one tilting cylinder.
  • the lifting frame also includes an attachment to which an attachment can be reversibly mounted and which is articulated to the front end of the lifting arm spaced from the pivot axis and to the connecting part so as to be pivotable about two parallel pivot axes.
  • the attachment has a hydraulic coupling part which can be automatically reversibly coupled by attaching an attachment to the attachment with an attachment-side hydraulic coupling part, thereby producing a hydraulic supply for the attachment.
  • the hydraulic coupling part is connected to the hydraulic circuit of the working device via at least two hydraulic lines, the hydraulic lines being designed to be flexible, at least in sections.
  • the hydraulic lines are attached to the reversing lever via a first suspension which is rotatably connected to the reversing lever about a horizontal axis of rotation.
  • the hydraulic lines can be optimally aligned in every position of the mast. As a result, there is no need to provide excessive hydraulic line lengths, which in certain positions can lead to bulges that are disruptive or even protrude into the work area. Instead, the entire lift and tilt area can be passed through without protruding or highly tensile hydraulic lines, which protects the hydraulic lines and extends their service life.
  • the rotatable first suspension according to the invention enables a direct connection of several hydraulic lines to a fully automatic hydraulic quick coupling, in the present case to the hydraulic coupling part, which considerably simplifies and accelerates the attachment process of the attachment.
  • the Hydraulic lines can be connected to the hydraulic coupling part via fixed connections, which is more cost-effective and less prone to leakage than swiveling hydraulic connections such as rotary screw connections.
  • the rotatability of the first suspension does not affect the hydraulic lines fastened in it or through it or connected to it, since there is no movement of individual hydraulic line sections relative to one another, but a movement or alignment of the hydraulic lines relative to the lifting frame.
  • the flexible hydraulic guide according to the invention is independent of the specific quick-release or hydraulic coupling system used, since only the hydraulic connections on the coupling side may need to be adapted. Furthermore, the implement according to the invention manages with fewer hydraulic line suspensions or fastenings, which reduces the costs and the maintenance effort. Finally, the hydraulic line guide according to the invention is also suitable for large line or hose diameters, since sharp bends are avoided and the hydraulic lines automatically adapt to the position of the mast.
  • the hydraulic coupling parts preferably form a hydraulic coupling, as shown in FIG EP 1 239 087 A1 is revealed.
  • the lifting arm is H-shaped in plan view and has a cross tube forming the H web, the deflection lever preferably being articulated like a rocker to a cheek formed on the cross tube.
  • the first suspension is arranged in the area of the pivot axis of the reversing lever, the axis of rotation preferably coincides with the pivot axis of the reversing lever.
  • the first suspension can be mounted on the deflection pin, which forms the pivot axis of the deflection lever, the first suspension being rotatable relative to the deflection pin.
  • the hydraulic coupling part has fixed or fixed hydraulic connections to which the hydraulic lines are connected, the hydraulic connections assuming a predetermined angle with respect to the hydraulic coupling part.
  • Such fixed hydraulic connections are stable and inexpensive and can be used here due to the adaptability of the alignment of the hydraulic hoses by means of the first suspension, whereby the fixed hydraulic connections can have a certain degree of flexibility or tolerances, for example through the use of spring elements.
  • the angle of the hydraulic connections to the rear surface of the hydraulic coupling part or to the plane running through the pivot axes of the scaffolding is preferably 90 °, but can also have other values and a certain tolerance of a few degrees, for example. This can also depend on the exact geometry of the mast.
  • the hydraulic lines are attached to the lifting arm via a second suspension that is firmly connected to the lifting arm are, wherein the second suspension is preferably attached or mounted on the cross tube.
  • the second suspension can also be arranged on the inside of the outer struts of the H-shaped lifting arm.
  • the fixed second suspension is easy and inexpensive to implement, for example as a simple hose clamp or pipeline. The adaptability of the hydraulic lines to the position of the mast is already ensured by the rotatable first suspension.
  • the hydraulic lines between the hydraulic coupling part and the second suspension are connected to the mast only by means of the first suspension, with preferably no further movable, ie in particular rotatable, suspensions for fastening the hydraulic lines on the mast apart from the first suspension are provided.
  • the first suspension is sufficient to ensure that the alignment of the hydraulic lines can be optimally adjusted. This means that further fastenings or suspensions for the hydraulic lines can be dispensed with, which reduces the costs and complexity of the hydraulic line routing.
  • the first suspension forms a mounting angle with the vertical which remains essentially constant when the deflection lever or the attachment scaffold is moved and the lifting arm is stationary at the same time.
  • the mounting angle is defined here in particular by the angle between the vertical and that plane which contains the axis of rotation of the first suspension and runs vertically through the hydraulic lines at the point that is closest to the axis of rotation. This level is referred to below as the "first auxiliary level”.
  • the mounting angle depends on the position of the lift arm and the length of the hydraulic lines.
  • a first line piece or hydraulic hose is used between the hydraulic coupling part and the first suspension per hydraulic line and a second line piece or hydraulic hose is used between the first and second suspension, which are connected to one another via corresponding hydraulic connections of the first suspension
  • the mounting angle depends on the length of the pipe sections or hydraulic hoses.
  • the mounting angle depends on the lengths of the line sections on both sides of the first suspension.
  • the mounting bracket can thus be optimally adapted to the geometry of the mast by selecting the lengths of the line sections or hydraulic hoses accordingly. This gives the hydraulic line guide according to the invention a high degree of flexibility.
  • the hydraulic lines i.e., as described above, in particular the lengths of the line pieces or hydraulic hoses, in which the angle of the previously defined first auxiliary plane to the longitudinal axis of the lifting arm, also referred to as the relative mounting angle, for any movement of the lifting frame, that is, the lifting arm and / or the reversing lever, remains essentially constant.
  • the relative mounting angle can be between 10 and 80 °, preferably between 30 and 60 °.
  • its longitudinal axis can be defined differently to determine the relative mounting angle.
  • the longitudinal axis of the lifting arm can be defined as the line lying in a plan view centrally between the side struts of the lifting arm and running within the plane that intersects the pivoting axis of the lifting arm and the lower pivoting axis of the scaffolding.
  • the longitudinal axis of the lifting arm can be defined as the line lying in a plan view centrally between the side struts of the lifting arm and running within the plane that intersects the pivoting axis of the lifting arm and the lower pivoting axis of the scaffolding.
  • other definitions can also be useful here.
  • the mounting angle (or the relative mounting angle) is of course not completely fixed, but is subject to a certain fluctuation or variation depending on the position of the mast, which is much less than the total Angular range of the reversing lever or scaffolding is.
  • the setting can be made for a specific lifting arm position and for a specific selection of the lengths of the hydraulic hoses and / or arrangements of the suspensions
  • the mounting angle may also vary slightly due to certain tolerances, for example material and / or manufacturing tolerances.
  • the variation of the mounting angle with a movement of the reversing lever or scaffolding and at the same time stationary lifting arm is less than 20 °, preferably less than 10 °, and particularly preferably less than 5 °. In a particularly preferred exemplary embodiment, the variation is less than 3 °. These values can also apply to the previously defined relative mounting angle. A variation of more than 10 ° can occur in particular when the first suspension is arranged outside the reversing lever, that is, when the axis of rotation of the first suspension does not coincide with the pivot axis of the reversing lever.
  • the hydraulic lines comprise flexible hoses which are arranged between hydraulic connections and / or hydraulic connections.
  • the combinations of hydraulic hoses, connections and connections can then be referred to as hydraulic lines.
  • the hydraulic lines can be designed overall (that is to say especially in the area between the hydraulic coupling part and the second suspension) as continuous hydraulic hoses which are connected to hydraulic connections of the hydraulic coupling part.
  • the hydraulic lines per line can be composed of several hose pieces, which are connected to one another, for example, by hydraulic connections. Bulkhead screw connections can be used for this.
  • the first suspension has hydraulic connections, the hydraulic lines between the hydraulic coupling part and the first suspension being designed as flexible hydraulic hoses and being connected to the hydraulic connections.
  • the hydraulic connections themselves are firmly attached to the first suspension and have first connections which preferably extend in the direction of the hydraulic coupling part.
  • the latter feature means in particular that the first connections of the hydraulic connections, when considering a plane which perpendicularly intersects the longitudinal axis of the lifting arm and contains the axis of rotation of the first suspension (hereinafter referred to as "second auxiliary plane"), point to that side of this plane, on which the hydraulic coupling part is located.
  • the hydraulic lines between the first and the second suspension are designed as flexible hydraulic hoses and are connected to the hydraulic connections.
  • the hydraulic connections have second connections, which preferably extend in the direction of the second suspension. This in turn means that the second connections point to that side of the second auxiliary plane on which the second suspension is located.
  • the hydraulic connections are preferably hose feedthroughs, whereby the end regions of the hose feedthroughs on both sides can be viewed as connections in the sense described above.
  • the hydraulic connections In a configuration in which the hydraulic lines between the hydraulic coupling part and the first suspension on the one hand and between the first and second suspension on the other hand are designed as separate hydraulic hose pieces, the hydraulic connections have actual connections on both sides of the first suspension to which the hydraulic hose pieces are connected. These are preferably bulkhead screw connections. However, it is also conceivable that a combination of hydraulic connection with actual connections and hose clamps can be used, for example with several different hydraulic lines.
  • the second suspension can comprise a hose clamp or be designed as such, which represents a particularly simple design.
  • hydraulic connections with connections to which the hydraulic hoses are connected can also be used here.
  • the hydraulic connections pointing in the direction of the hydraulic coupling part and / or the second suspension are angled, in particular are angled downwards in the direction of the lifting arm, so that the hydraulic hoses are independent of the movement of the lifting frame at a predetermined angle with the first Suspension are connected.
  • appropriately angled hose feed-throughs can also be used here.
  • the end regions of the hydraulic hoses adjoining the connections always assume a certain angle to the first auxiliary plane, which angle corresponds to the angle of the connections of the hydraulic connections.
  • the angle can be 45 °, for example.
  • the angled hydraulic connections ensure that when the mast moves, no uncontrolled bulges of the hydraulic hoses can arise, in particular in the area between the hydraulic coupling part and the first suspension. If the angle is not specified by the hydraulic connections, an uncontrollable and irreversible bulging of the hydraulic hoses can occur in this area, especially near the first suspension. Such an undesired change of direction can occur spontaneously or, for example, be caused by a pressure surge in a hydraulic line. This can damage the hydraulic hoses, for example through contact with nearby components, and cause chafing and kinks.
  • the hydraulic hoses in the area of the hydraulic connections of the first suspension have a curvature with a constant sign regardless of the movement of the mast.
  • the hydraulic hoses in the area of the first suspension, have a bulge directed downwards or towards the lifting arm, which, and therefore, points in the same direction regardless of the movement of the lifting frame always has a rectified (i.e. negative or positive - depending on the definition or viewing direction) curvature, the amount of which, however, depends on the position of the mast.
  • curvature is meant, in particular, the mathematical curvature in a side view of the working device or the hydraulic hoses.
  • the hydraulic hoses in the area of the hydraulic connections of the hydraulic coupling part preferably have a curvature, the sign of which varies with the movement of the mast.
  • the hydraulic hoses depending on the position, in particular of the scaffolding, bend away from the hydraulic connection of the hydraulic coupling part upwards or downwards.
  • the hydraulic hoses curve downward in the case of an attached wheel loader shovel inclined downwards and upward in the direction of the first suspension with a wheel loader shovel pivoted upward.
  • the spatial routing of the hydraulic hoses is always defined and there are no unwanted changes in direction.
  • the hydraulic lines in the area between the hydraulic coupling part and the first suspension are located above a lower edge of the working device, regardless of the position of the lifting frame.
  • the lower edge is in particular the lower edge of the attachment scaffolding, which can also be a lower edge of an attachment. This ensures that the hydraulic lines never touch the ground or protrude into the working area of the implement and can thus be damaged.
  • the smallest distance between the hydraulic lines and the floor which is also referred to as slack, is the smallest in particular with a lowered lifting arm and a tipped-in scaffold or attachment.
  • the sag is preferably greater than 5 cm, particularly preferably greater than 10 cm, in order to have a sufficient safety distance from the floor.
  • the scaffold has two hydraulic coupling parts which are automatically connected to the scaffold with two hydraulic coupling parts on the accessory side can be reversibly coupled and thereby a hydraulic supply of the attachment can be produced.
  • a hydraulic supply by means of two hydraulic coupling parts can be advantageous, for example, in the case of an attachment with several hydraulic consumers, such as a high-tip shovel with a hydraulic hold-down device.
  • Each hydraulic coupling part is connected via at least two hydraulic lines to a separate or a common hydraulic circuit of the implement in order to supply the different consumers of the attachment.
  • the hydraulic coupling parts are connected to a common hydraulic circuit, the supply of the individual consumers can be controlled via hydraulic valves in the hydraulic circuit.
  • a separate first suspension and a separate second suspension are preferably provided for each hydraulic coupling part, which are arranged in particular in a plan view of the lifting frame on opposite sides of the longitudinal axis of the lifting arm, i.e. to the right and left of it but at the same height. It can be provided that the axes of rotation of the two first suspensions coincide and furthermore preferably coincide with the pivot axis of the reversing lever.
  • All of the embodiments described above apply to such an arrangement of a plurality of hydraulic coupling parts, each with a plurality of first and possibly second suspensions.
  • a different number of hydraulic lines with possibly different shapes or diameters and possibly different material properties, such as rigidity, can be connected to each of the hydraulic coupling parts.
  • one of the hydraulic coupling parts can be connected to two and the other of the hydraulic coupling parts to three hydraulic lines. In the latter case, the three hydraulic lines are held by the associated first and the associated second suspension.
  • Each of the hydraulic couplings is preferably formed by a hydraulic coupling block, as shown in FIG EP 1 239 087 A1 is revealed.
  • the swivel axes of the scaffold simultaneously represent the locking axes for locking the add-on device, i.e. the add-on device is connected to the scaffold and locked via the swivel axes.
  • the scaffolding is a quick coupler without front dimensions, i.e. without mounting height. The combination of quick coupler without front dimensions and fully automatic hydraulic quick coupling is only made possible or significantly facilitated by the flexible hydraulic line routing according to the invention.
  • the Figure 1 shows a wheel loader 1 known from the prior art with a lifting frame in Z-kinematics according to the preamble of claim 1, the hydraulic coupling and the hydraulic lines not being shown here.
  • the Figure 1 has already been described at the beginning, so that a repetitive description can be dispensed with at this point.
  • the exemplary embodiments of the implement according to the invention described below are based on a wheel loader 1, as shown in FIG Figure 1 is shown. However, it can also be any other work device with a lifting frame in Z-kinematics.
  • the Figures 2-4 show schematic side views of the front part of the implement 1 according to the invention as longitudinal sections through the lifting frame 10 in three different positions of the lifting frame 10.
  • the deflection lever 14 is articulated on a cheek 19 formed on the cross tube 18 so as to be pivotable about a horizontal pivot axis B.
  • the scaffolding 20 is both at the front end of the lifting arm 12 about a horizontal pivot axis C and articulated at the front end of the connecting part 16 so as to be pivotable about a horizontal pivot axis D.
  • the pivot axes A, B, C and D and the cross tube 18 run parallel to one another.
  • the reference number 4 denotes one of the front wheels of the implement 1.
  • the attachment frame 20 is designed as a quick coupling part of a quick change device, by means of which an attachment 60 (in the present exemplary embodiment a wheel loader shovel) can be mounted reversibly quickly and easily.
  • an attachment-side quick coupling part is mounted on the attachment 60, which can be brought into engagement and locked with the tool-side quick coupling part or attachment frame 20.
  • the quick coupling part or scaffolding 20 has no front dimensions or no mounting height, the pivot axes C and D simultaneously serving to fasten and lock the mounting tool 60.
  • a quick coupler with an attachment height or front dimension would mean that the pivot axes C and D of the attachment frame 20 and the locking axes to which the attachment tool 60 can be attached fall apart, i.e. are spaced apart from one another. However, this results in a larger lever arm, which has a negative effect on the maximum load capacity of the implement 10.
  • a hydraulic coupling part 22 is arranged on the attachment 20 which, when the attachment 60 is installed, is connected to a corresponding hydraulic coupling part on the attachment side 21 cooperates.
  • the hydraulic coupling part 22 is connected to the hydraulic circuit of the working device 1 via a plurality of hydraulic lines 50.
  • the hydraulic coupling part 22 has hydraulic connections 24 to which flexible first hydraulic hoses 52 are connected.
  • the hydraulic connections 24 are firmly connected to the hydraulic coupling part 22 and assume a fixed angle of, for example, 90 ° to its rear wall or to a plane running through the pivot axes C and D.
  • the first hydraulic hoses 52 are attached at the other end via a first suspension 30 to the deflection lever 14 in order to achieve flexible and defined hose routing.
  • the two hydraulic coupling parts or halves 21, 22 couple out of a circular movement, due to a corresponding circular movement when attaching the attachment 60 to the attachment or the quick coupler 20.
  • a hydraulic coupling as it is, for example, in FIG EP 1 239 087 A1 is described.
  • the fixed hydraulic connections 24 have a certain angular tolerance, for example 90 ° ⁇ a few degrees. This can be done, for example, with flexible elements such as springs.
  • the first suspension 30 is mounted on the reversing lever 14 so as to be rotatable about an axis of rotation E, the axis of rotation E coinciding with the pivot axis B.
  • the first suspension 30 is fastened to the deflection bolt of the deflection lever 14 forming the pivot axis B and is freely rotatable relative to this (see FIG Figure 6 ).
  • the first suspension 30 has hydraulic connections 32, 34, which are located on both sides of the in the Figures 2-4 first auxiliary plane H drawn in.
  • the sections of the hydraulic connections arranged on the side of the hydraulic coupling part 22 are designated with 32 and the sections arranged on the other side with 34.
  • the hydraulic connections 32, 34 are designed as bulkhead screw connections and therefore have connections 32, 34 on each side of the plane H.
  • the first hydraulic hoses 52 are connected to the connections 32 of the hydraulic connections 32, 34.
  • Second flexible hydraulic hoses 54 are connected to the opposite connections 34 of the hydraulic connections 32, 34 and run as far as a second suspension 40 via which the second hydraulic hoses 54 are firmly connected to the lifting arm 12.
  • the second suspension 40 is fixed, ie immovably mounted on the outside of the cross tube 18 of the lifting arm 12, in this embodiment in the upper area of the cross tube 18 facing the pivot axis A Figures 2-4 connected to the hydraulic circuit of the implement 1 by means of two parallel lines.
  • the second suspension 40 (apart from the hose lengths used), in particular the courses of the first and second hydraulic hoses 52, 54 and the position, ie in particular the mounting angle, of the first suspension 30 can be influenced.
  • the second hydraulic hoses 54 hold the first suspension 30 or the first hydraulic hoses 52 in the desired position.
  • the connections of the hydraulic connections 32, 34 are opposite the first auxiliary level H (ie in the Figures 2-4 angled downwards in the direction of the lifting arm 12), for example by 45 °.
  • H ie in the Figures 2-4 angled downwards in the direction of the lifting arm 12
  • This specifies the direction in which the hydraulic hoses 52, 54 run in the area of the first suspension 30, so that unwanted or uncontrolled bulges or evertings of the hydraulic hoses 52, 54, in particular the first hydraulic hoses 52, cannot occur.
  • Such an unwanted and potentially irreversible eversion 53 of the first hydraulic hoses 52 is shown in FIG Figure 4 shown.
  • the hydraulic connections 32, 34 can be straight and the ends or connections of the hydraulic hoses 52, 54 angled.
  • the free rotation of the first suspension 30, the fixed hydraulic connections 24 on the hydraulic coupling part 22, the angled design of the hydraulic connections 32, 34 and the second suspension 40 fixedly arranged on the cross tube 18 create a flexible hydraulic hose guide that enables several hydraulic lines 50 to be connected to one
  • the freely rotatable first suspension 30 aligns itself automatically so that sufficient hose length is always available without kinks or excessively small radii of curvature in the hydraulic hoses 52, 54.
  • the controlled hydraulic hose movement gives the operator a better view of the work area of the work device 1, since the hydraulic lines 50 do not protrude so much into the work area.
  • FIGS 2-4 show Figures 2-4 the lifting frame 10 in three different positions, in which the lifting arm 12 remains in a lowered position and the attachment 20 or attachment 60 is tilted into different positions by pivoting the reversing lever 14.
  • the angle of the first auxiliary plane H relative to the vertical V which is also referred to as the mounting angle ⁇ , remains essentially the same.
  • the rotation of the reversing lever 14 is thus compensated for by the rotatably mounted first suspension 30.
  • the mounting angle ⁇ depends on the lift / tilt position of the lift arm 12 and on the hose lengths of the hydraulic hoses 52 and 54 and is set to a certain value ⁇ for a certain position of the lift arm 12 depending on the hose lengths selected. This results in a certain tolerance in the selected length of the first hydraulic hoses 52, which in the Figure 4 is denoted by the reference symbol x. This tolerance can be approximately 20% of the hose length of the first hydraulic hoses 52.
  • the length of the second can also be Hydraulic hoses 54 can be varied. By varying the lengths of the first and / or second hydraulic hoses 52, 54, the mounting angle ⁇ can be flexibly adapted to the circumstances.
  • the mounting angle ⁇ varies only by a few degrees, as in FIG Figure 5 is illustrated.
  • Reasons for the variation ⁇ can also be fluctuating material parameters (diameter, stiffness, etc.) as well as hose lengths.
  • the mounting angle ⁇ has the greatest deviations at the tilting-in and tilting-out end positions of the attachment 60 or attachment 20.
  • the sign of the curvature of the first hydraulic hoses 52 in the area of the hydraulic connections 32 of the first suspension 30 remains constant. So is in the Figures 2-4 it can be seen that the first hydraulic hoses 52 bend to the left in each position in the direction of the scaffolding 20. In contrast, the sign of the curvature changes in the area of the fixed hydraulic connections 24 on the hydraulic coupling part 22 Figures 2 and 3 the first hydraulic hoses 52 bend to the left or upwards in the direction of the lower edge of the lifting arm 12, while they are in the Figure 4 , in which the wheel loader bucket 60 is completely tipped out, bend to the right in the direction of the upper edge of the lifting arm 12. In this position, the first hydraulic hoses 52 run in an S-shape, that is, undergo a change in the sign of curvature. In the positions of Figures 2 and 3 the sign of the curvature remains the same.
  • the optimized hose routing also prevents the hydraulic hoses 52 from touching the ground when the lifting frame 10 is in a lowered position. This is particularly problematic when the attachment 60 tilts when the lifting arm 12 is lowered. This position is in the Figure 3 shown.
  • the flexible hose routing results in a minimal sag d (ie safety distance from the floor).
  • This sag d is preferably at least 8-10 cm.
  • a variance of approximately 20% of the hose length of the first hydraulic hoses 52 preferably leads to the same sag d.
  • first and second suspensions 30, 40 there is no further fastening of the hydraulic lines 50 on the lifting frame 10.
  • a further fixed fastening of the hydraulic lines 50 between the second suspension 40 and the chassis 2 can be arranged on the lifting arm 12, in particular on an inside of the H-shaped lifting arm 12.
  • the second hydraulic hoses 54 can extend up to this further fastening, whereby they are held and fixed by the second suspension 40, designed for example as a hose clamp.
  • first and second hydraulic hoses 52, 54 which are connected to one another via angled bulkhead screw connections 32, 34
  • continuous hydraulic hoses can also be used, the hydraulic connections 32, 34 then preferably being designed as angled hose ducts or holders. This also allows the necessary direction to be specified for the continuous hydraulic hoses.
  • an embodiment of the first suspension 30 is shown as an exploded view, in which the hydraulic connections 32, 34 are formed by bulkhead screw connections, which are located opposite the reversing lever 14 rotatably mounted holding plate 36 are attached.
  • the hydraulic connections 32, 34 are formed by bulkhead screw connections, which are located opposite the reversing lever 14 rotatably mounted holding plate 36 are attached.
  • it is not the bulkhead screw connections 32, 34 but rather the ends of the hydraulic hoses 52, 54 (not shown) that are angled. Accordingly, the bulkhead screw connections 32, 34 are straight here.
  • the mounting plate 36 is fastened here by means of a screw connection in the center of the reversing lever bolt, which forms the pivot axis B of the reversing lever 14.
  • the central element is a screw connection or screw 38, which is then provided with a washer or washer on an outer screw head and passed through a holder 37 fastened to the holding plate 36.
  • the holding plate 34 is provided with several (here two) through bores into which the bulkhead screw connections 32, 34 are screwed or framed.
  • the number of bulkhead screw connections 32, 34 depends on the number of hydraulic lines 50 to be fastened.
  • the hydraulic hoses 52, 54 in particular angled at the ends, are screwed onto the protruding ends of the bulkhead screw connections 32, 34.
  • the screw connection 38 is fixed on the deflection bolt, with a nut 39 countering the screw connection 38 towards the deflection lever 14 and another shim or washer being attached.
  • the holder 37 can remain movable with respect to the reversing lever 14 or reversing bolt.
  • FIGS 7-8 show the mast 10 and the hydraulic hose guide according to the invention on the basis of a specific exemplary embodiment, the Figure 8 a plan view of the lift arm 12 and the Figure 7 a side view along the in the Figure 8 with a2 designated section shows.
  • the hydraulic lines 50 between the second suspension 40 and the hydraulic circuit of the implement 1 are not shown for reasons of clarity.
  • this hydraulic arrangement can be arranged on one side of the reversing lever 14 (in the Figure 8 this is the left side as seen from cab 3). It can of course be on the other side (i.e. in the Figure 8 the right side) a second hydraulic coupling with corresponding hydraulic lines 50 can be provided.
  • the number and material properties (such as, for example, diameter, rigidity, etc.) of the hydraulic lines 50 of the second hydraulic coupling can be different from those of the first hydraulic lines 50.
  • first and second suspensions 30, 40 are preferably arranged on the opposite side of the reversing lever 14, i.e. mirror-symmetrically to the longitudinal axis of the lifting frame 10 or lifting arm 12 or reversing lever 14.
  • Both hydraulic coupling parts 22 can be connected to separate or a common hydraulic circuit of the implement 1 must be connected. This can be used, for example, in the case of an attachment 60 with several hydraulic consumers (such as a high-tip shovel with a hydraulic hold-down device).
  • hydraulic lines 50 an inlet and a return can be connected to the first hydraulic coupling part 22, for example, and an inlet, a return and a leakage oil line can be connected to the second hydraulic coupling part 22.
  • other arrangements are also conceivable in which more than two hydraulic couplings and corresponding hydraulic lines 50 and suspensions 30, 40 are used.
  • FIG 9 is finally the area marked with the reference symbol a1 Figure 7 Shown enlarged, which shows the connected hydraulic coupling with the implement-side and attachment-side hydraulic coupling parts 21, 22.
  • the hydraulic coupling in this exemplary embodiment comprises a suspension 23 and a linear guide, so that a precisely fitting, interference-free and leak-free, fully automatic coupling of the hydraulic coupling halves 21, 22 is ensured when the quick coupling parts are brought together.
  • this hydraulic coupling is explicitly referred to the disclosure of EP 1 239 087 A1 referenced.
  • FIGs 10 and 11 is that already in Figure 7
  • the lifting frame 10 shown is shown in two different positions, which differ both in the position of the reversing lever 14 and in the position of the lifting arm 12.
  • the lifting arm 12 is in a raised position with the lifting cylinder 5 extended and the tilting cylinder 6 retracted, so that the wheel loader shovel 60 is pivoted downward.
  • the lifting arm 12 is completely lowered by retracting the lifting cylinder 5, while the tilting cylinder 6 is extended so that the wheel loader shovel 60 is pivoted upwards.
  • the respective auxiliary plane H is shown, the angle of which to the vertical V (not shown here) defines the mounting angle ⁇ for the respective mast position.
  • the mounting angle ⁇ remains essentially constant for a specific (fixed) position of the lifting arm 12 when the reversing lever 14 is moved.
  • the mounting angle ⁇ changes with a movement of the lifting arm 12, so that different mounting angles ⁇ result for different positions of the lifting arm 12.
  • This angular range is defined by the minimum and maximum mounting angles ⁇ min and ⁇ max in the extreme positions of the mast 10 and depends on the geometry of the mast 10 and the hydraulic hose suspension, i.e. in particular the positions of the first and second suspensions 30, 40 and / or the ones used Lengths of the first and second hydraulic hoses 52,54.
  • a mounting angle ⁇ is set which remains essentially constant when only the reversing lever 14 is moved, that is to say varies in particular by only a few degrees ⁇ .
  • the angle between the first auxiliary plane H and the longitudinal axis of the lifting arm 12 (not shown), the so-called relative mounting angle, is essentially constant for both mast positions.
  • the longitudinal axis of the non-linear lifting arm can be defined as that line which runs through the pivot axes A and C and, viewed from above, runs centrally between the side struts of the lifting arm 12.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
EP20199599.0A 2019-10-01 2020-10-01 Équipement, en particulier chargeur sur roues Pending EP3800299A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019126439.1A DE102019126439A1 (de) 2019-10-01 2019-10-01 Arbeitsgerät, insbesondere Radlader

Publications (1)

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EP3800299A1 true EP3800299A1 (fr) 2021-04-07

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EP20199599.0A Pending EP3800299A1 (fr) 2019-10-01 2020-10-01 Équipement, en particulier chargeur sur roues

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EP (1) EP3800299A1 (fr)
DE (1) DE102019126439A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE102021124436B3 (de) 2021-09-21 2023-02-02 Schäffer Maschinenfabrik GmbH Baumaschine und Verfahren zum Antreiben eines Arbeitsgerätes

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
DE102022126522A1 (de) 2022-10-12 2024-04-18 Liebherr-France Sas Arbeitsmaschine mit Kupplungsvorrichtung für fluidführende Leitungen

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EP1239087A1 (fr) 2001-03-09 2002-09-11 Liebherr-Hydraulikbagger GmbH Accouplement rapide
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EP1239087A1 (fr) 2001-03-09 2002-09-11 Liebherr-Hydraulikbagger GmbH Accouplement rapide
US20150132095A1 (en) * 2013-11-13 2015-05-14 Kubota Corporation Working machine
DE102015104187A1 (de) * 2014-03-26 2015-10-01 Kubota Corporation Arbeitsmaschine

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Publication number Priority date Publication date Assignee Title
DE102021124436B3 (de) 2021-09-21 2023-02-02 Schäffer Maschinenfabrik GmbH Baumaschine und Verfahren zum Antreiben eines Arbeitsgerätes
EP4151804A1 (fr) 2021-09-21 2023-03-22 Schäffer Maschinenfabrik GmbH Engin de chantier et procédé d'entraînement d'un outil de chantier

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