Patent Description:
The invention relates also to a mobile mining machine.

Mobile mining machines, specifically articulated mobile mining machines, may be provided with a central oscillation. The central oscillation may allow a front frame and a rear frame of the mobile mining machine structure to move side to side relative to each other by a specific amount.

A central oscillation may be critical to improving stability of the mobile mining machine. It helps ensure that all four tires remain in contact with the ground on uneven terrain.

Various oscillation bearing arrangements have been introduced in connection with the central oscillation of mobile mining machines. However, their assembly may be complicated, or they may have rather low life. Some arrangements may be unsuitable for reversing loads or may be inherently prone to play an unwanted motion. Some arrangement may have very high costs, and high precision is needed in machined parts. Furthermore, some prior art arrangements may have bad performance in lubrication starvation conditions. Some prior art arrangements may be unsuitable for high loads or shock loads. A mobile mining machine is for example known from <CIT>.

The objective of the invention is to alleviate the disadvantages mentioned above.

According to a first aspect, the present invention provides an oscillation bearing arrangement of a mobile mining machine, the oscillation bearing arrangement comprising: an inner frame structure, an outer frame structure, a first bearing structure and a second bearing structure arranged between the inner frame structure and the outer frame structure, wherein the oscillation bearing arrangement is arranged to allow a relative tilting movement between the inner frame structure and the outer frame structure.

According to the invention, the first bearing structure is a tapered plain bearing comprising a first bushing, and/or the second bearing structure is a tapered plain bearing comprising a second bushing.

According to the present invention, the mobile mining machine comprising a front frame, a rear frame and an articulated joint between the front frame and the rear frame. The mobile mining machine comprises an oscillation bearing arrangement according to any one of embodiments mentioned below or above alone or combined with other embodiments.

The technical effect is that the tapered plain bearing with bushings allow of adjustment of the system to eliminate play as the bushings wear.

The oscillation bearing arrangement and the mobile mining machine are characterized by what is stated in the independent claim.

According to the invention, the first bushing and/or the second bushing may be a tapered bushing. An advantage for tapered bushing is that tapered bushings allow of adjustment of the system to eliminate play as the bushings wear. A further advantage is that the tapered bushings allow for radial, moment and axial force reaction. In an embodiment, only two bushings may be needed. In a conventional prior art cylindrical bushing arrangement axial thrust bushings would be needed in addition to cylindrical bushings. In addition, high load capacity and shock durability may be achieved.

In an embodiment of the oscillation bearing arrangement, the first bushing and/or the second bushing may be made from one or more of the following: metal, graphite, plastic, or composite material. An advantage for this is that the bushing may be made from a material suitable for demanding environmental conditions. A further advantage is that the bushing may be made from a material suitable for lubrication starvation conditions.

In an embodiment of the oscillation bearing arrangement, the first bushing and/or the second bushing may be made from a composite polyester graphite material. An advantage is that the bearing is a low friction material and greaseless. A further advantage is that plain composite bushings have the best overall performance for shock and load durability.

According to the invention, an inner seat of the first bushing is arranged between the inner frame structure and the first bushing. An advantage is that by using the inner seat between the inner frame structure and the first bushing, properties of the inner seat may be optimized, and an easy adjustment of the bearing may be achieved.

According to the invention, an inner seat of the second bushing is arranged between the inner frame structure and the second bushing. An advantage is that by using the inner seat between the inner frame structure and the second bushing, properties of the inner seat may be optimized, and an easy adjustment of the bearing may be achieved.

In an embodiment of the oscillation bearing arrangement, the first bearing structure and/or the second bearing structure may be an adjustable bearing structure. An advantage is that an easy adjustment of the oscillating bearing arrangement may be achieved.

In an embodiment of the oscillation bearing arrangement, the inner seat of the first bushing or the inner seat of the second bushing may be adjustable in an axial direction. The tapered design of the bearings allows the bearings to be adjusted as wear occurs.

In an embodiment of the oscillation bearing arrangement, an adjusting member, such as a pin, may be arranged for adjusting the inner seat of the first bushing or the inner seat of the second bushing. In an embodiment, the adjusting member may be a pin provided with threads. An advantage is that the tapered design of the bearings may allow the bearings to be adjusted by tightening the pin, or by another adjusting member. In an embodiment, the pin, or other adjusting member, may extend through the tapered bearing or its part, such as a seat.

In an embodiment of the oscillation bearing arrangement, the inner seat of the first bushing and/or the inner seat of the second bushing may be a conical inner seat. An advantage for this is that tapered fits of the bearing seats into the corresponding structures may allow for reduction in tolerances and precision required in the fabrication. The conical seats may be pushed into an assembly in order to tighten the assembly for example on a normal service interval of the machine.

According to the invention, the oscillation bearing arrangement further comprises an outer seat for the first bushing and/or an outer seat for the second bushing. An advantage is that by using the outer seat between the outer frame structure and the first bushing and/or between the outer frame structure and the second bushing, properties of the outer seat may be optimized.

In an embodiment of the oscillation bearing arrangement, the first bushing and the second bushing may be arranged so that a second end of the first bushing is arranged towards a second end of the second bushing, wherein a diameter of the second end of the first bushing is smaller than a diameter of a first end of the first bushing, and wherein a diameter of the second end of the second bushing is smaller than a diameter of a first end of the second bushing. In an embodiment, the first bushing and the second bushing may be arranged so that a support flange may be between the first bushing and the second bushing. In an embodiment, the first bushing and the second bushing may be arranged coaxially. In an embodiment, the first tapered bushing and the second tapered bushing may be arranged so that a first end, a tapering end, of the first tapering bushing is arranged towards the first end, the tapering end, of the second tapering bushing. An advantage for this is that it may receive axial and radial loads effectively, and the assembly and its adjustment are easy to accomplish.

According to the invention, the inner seats are arranged on the inner frame structure and may be connected by a connecting bolt to the inner frame structure and the inner seats are arranged on the inner frame structure and may be connected by an adjustable pin to an end plate of the oscillation bearing arrangement.

According to the invention, the outer seat for the first bushing and the outer seat for the second bushing are connected to the outer frame structure, for example via a support flange arranged to the outer frame structure between the outer seat of the first bushing and the outer seat of the second bushing.

According to the invention, the inner frame structure is connected to the rear frame of the mobile mining machine and the outer frame structure is connected to the front frame of the mobile mining machine.

According to the invention, the mining machine comprises a front frame, a rear frame and an articulated joint between the front frame and the rear frame.

According to the invention, the mobile mining machine comprises an oscillation bearing arrangement.

The oscillation bearing arrangement may have several important advantages. Tapered bushings may allow of adjustment of the system to eliminate play as the bushings wear. The conical seat can be pushed into the assembly in order to tighten the assembly on a normal service interval.

The tapered bushings may allow for radial, moment and axial force reaction. Only two bushings may be needed. In a conventional cylindrical bushing arrangement, axial thrust bushings would be needed.

The tapered fits of the bearing seats into the corresponding structures may allow for reduction in tolerances and precision required in the fabrication.

The tapered plain bushing design may provide further benefits:.

In the following, all technical features introduced by the auxiliary verb "may" shall be considered as non-optional and as essential features for the invention, provided that these features are comprised in the independent claim <NUM>.

According to an aspect of the invention, the oscillation bearing arrangement described in this description may be arranged in a mobile machine <NUM>. The mobile machine may be a mine machine, or a construction machine, e.g., a rock drilling rig, a development drill, a tunneling drilling machine, a surface drilling machine, a bolting or reinforcing vehicle, a rock removal machine, a longhole drill rig, an explosive charging machine, a loader, a dumper, a transport vehicle, a loading or hauling machine, setting vehicles of gallery arcs or nets, a concrete spraying machine, a crusher, or a measuring vehicle. In an embodiment, the mobile mining machine may be for underground mines or sites. <FIG> shows one example of a mobile mining machine <NUM>. The mobile mining machine may be a mining vehicle. In an embodiment, the mobile mining machine <NUM> may be equipped with a dump bed. The drive equipment may comprise one or more drive motors and one or more power transmission means for transmitting drive power to one or more wheels <NUM>. The drive power transmission may comprise a mechanical gear system and mechanical power transmission members or, alternatively, the drive power transmission may be hydraulic or electric. In an embodiment, the drive motor may be a hub motor. In an embodiment, a powertrain of the mobile underground mining machine may comprise a hub motor arrangement. In an embodiment, the mobile mining machine may comprise wheels <NUM>. In an embodiment, the wheels <NUM> may be arranged on a frame. In an embodiment of the mobile mining machine <NUM>, the frame may comprise a front frame <NUM> and a rear frame <NUM>. In an embodiment, at least one first pair of wheels <NUM> may be arranged on the front frame <NUM> so that at least one wheel may be arranged on a first side of the front frame and at least one second wheel may be arranged on the second side of the front frame, and that the front frame may be arranged between the first front wheel and the second front wheel. In an embodiment, at least one second pair of wheels <NUM> may be arranged on the rear frame <NUM> so that at least one wheel may be arranged on a first side of the rear frame <NUM> and at least one second wheel may be arranged on the second side of the rear frame, and that the rear frame <NUM> may be arranged between the first rear wheel and the second rear wheel. The front frame <NUM> and the rear frame <NUM> may be arranged to tilt in relation to each other around a rotational axis L. According to the invention, the rotational axis L isa longitudinal axis of the mobile mining machine <NUM>. In an embodiment, the rotational axis L may be a main moving axis of the mobile mining machine <NUM>. In an embodiment, wheels <NUM> of each pair of the wheels may be arranged on different sides of the rotational axis L. In an embodiment, this tilting movement may be called an oscillation. A central oscillation may allow a front frame and a rear frame of the mining machine structure to move side to side relative to each other by a specific amount. In an embodiment, the central oscillation may allow the front frame and the rear frame of the machine structure to move side to side relative to each other, for example by about +/-<NUM> deg. The relative movement may vary depending on the application. Typically, the relative movement between the front frame and the rear frame may be side to side by about +/- <NUM> to <NUM> deg.

A central oscillation may be critical to improving stability of an articulated machine. It helps ensure that all tires, for example four tires, remain in contact with the ground on uneven terrain.

The mobile mining machine <NUM> of <FIG> has four wheels <NUM>. The number of wheels may vary and instead of wheels, there may be different kind of mechanism for moving, for example a track arrangement. In an embodiment, the mobile mining machine may comprise a frame comprising a front frame and a rear frame.

In an embodiment, a front part of the mobile mining machine and a rear part of the mobile mining machine may be arranged to turn in relation to each other and in relation to a vertical axis.

In an embodiment, the mobile mining machine may comprise an oscillation bearing arrangement <NUM>. In an embodiment, the oscillation bearing arrangement <NUM> may comprise an inner frame structure <NUM> and an outer frame structure <NUM>. In an embodiment, the inner frame structure <NUM> may be arranged to be connected to the rear frame <NUM>, optionally via an oscillation frame structure. In an embodiment, the outer frame structure <NUM> may be connected to a structure of the front frame <NUM> or may be a part of the front frame <NUM>. In an embodiment, the inner frame structure <NUM> and the outer frame structure <NUM> may be arranged to tilt in relation to each other. In an embodiment, the inner frame structure <NUM> and the outer frame structure <NUM> may be arranged to tilt relative to each other around the rotational axis L.

In an embodiment, the oscillation bearing arrangement <NUM> may comprise an inner frame structure <NUM>, an outer frame structure <NUM>, a first bearing structure and a second bearing structure. The first bearing structure may be a tapered plain bearing arranged between the inner frame structure <NUM> and the outer frame structure <NUM>. In an embodiment, the second bearing structure may be a tapered plain bearing arranged between the inner frame structure <NUM> and the outer frame structure <NUM>.

The oscillation bearing arrangement <NUM> may be arranged to allow a relative tilting movement between the inner frame structure <NUM> and the outer frame structure <NUM>. In an embodiment, the oscillation bearing arrangement may be arranged to allow a relative movement between the inner frame structure <NUM> and the outer frame structure <NUM> around the rotational axis L.

The first tapered bearing structure may comprise a first bushing <NUM>. In an embodiment of <FIG>, the first bushing <NUM> may be a tapered bushing. A first end <NUM> of the first bushing <NUM> may have a first diameter D1. A second end <NUM> of the first bushing <NUM> may have a second diameter D2. In an embodiment, the first diameter D1 of the first end <NUM> of the first bushing <NUM> may be a larger diameter. In an embodiment, the second diameter D2 of the second end <NUM> of the first bushing <NUM> may be a smaller diameter. In an embodiment, a taper angle α (alpha) may be calculated: tan α (alpha)= (D1-D2)/<NUM>, wherein D1 is larger diameter of tapered bushing (mm), D2 is smaller diameter of tapered bushing (mm), L is a length of tapered bushing (mm) and α (alpha) is an angle of taper. <NUM>*α (alpha) is a full taper angle. In <FIG>, the tapering angle α (alpha) of the first bushing <NUM> is marked between a tapering line <NUM> and a line (normal) perpendicular to the rotational axis L.

The second tapered bearing structure may comprise a second bushing <NUM>. In an embodiment of <FIG>, the second bushing <NUM> may be a tapered bushing. A first end <NUM> of the second bushing <NUM> may have a first diameter D1. A second end <NUM> of the second bushing <NUM> may have a second diameter D2. In an embodiment, the first diameter D1 of the first end <NUM> of the second bushing <NUM> may be a larger diameter. In an embodiment, the second diameter D2 of the second end <NUM> of the second bushing <NUM> may be a smaller diameter. In an embodiment, a taper angle β (beta) of the second bushing may be calculated: tan β (beta) = (D1-D2)/<NUM>, wherein D1 is larger diameter of tapered bushing (mm), D2 is smaller diameter of tapered bushing (mm), L is a length of tapered bushing (mm) and β (beta) is an angle of taper. <NUM>* β (beta) is a full taper angle. In <FIG>, the tapering angle β (beta) of the second bushing <NUM> is marked between a tapering line <NUM> and a line (normal) perpendicular to the rotational axis L.

In an embodiment, the first tapered bearing structure may comprise a tapered bushing <NUM> that is made of metal or composite material. In an embodiment, the second tapered bearing structure may comprise a tapered bushing <NUM> that is made of metal or composite material.

In an embodiment, the first tapered bearing structure may comprise a first tapered bushing <NUM> that is made of a composite polyester graphite material. In an embodiment, the second tapered bearing structure may comprise a second tapered bushing <NUM> that is made of a composite polyester graphite material.

The first tapered bearing structure may comprise at least one inner seat <NUM> between the inner frame structure <NUM> and the first bushing <NUM>. In an embodiment, the at least one inner seat <NUM> may be a conical inner seat.

The second tapered bearing structure may comprise at least one inner seat <NUM> between the inner frame structure <NUM> and the second bushing <NUM>. In an embodiment, the at least one inner seat <NUM> may be a conical inner seat.

In an embodiment, the inner seats may be made of metal. In an embodiment, the inner seats may be made of steel. In an embodiment, the inner seats may be made of hardened steel.

In an embodiment, the inner frame structure <NUM> may comprise a first support surface <NUM>. In an embodiment of <FIG>, the first support surface <NUM> may extend from an outer surface of inner frame structure <NUM> a distance towards the rotational axis L in a transverse direction relating to the rotational axis L. In an embodiment of <FIG>, the first support surface <NUM> may extend from an outer surface of inner frame structure <NUM> a distance towards the rotational axis L in a plane perpendicular to the rotating axis L. The first support surface <NUM> may extend inwards from an outer surface of the inner frame structure <NUM>. The first support surface <NUM> may form a shoulder for abutting a first end <NUM> of the inner seat <NUM> of the first bushing <NUM>.

The inner frame structure <NUM> may comprise a second support surface <NUM>. In an embodiment, the second support surface <NUM> may be a cylindrical surface. A diameter of the second support surface <NUM> may be smaller than the outer surface of the inner frame structure <NUM>. The second support surface <NUM> may extend a distance from an end surface <NUM> of the inner frame structure <NUM> towards the first support surface <NUM>. In an embodiment of <FIG>, a third support surface <NUM> may be arranged between the second support surface <NUM> and the first support surface <NUM>.

The first support surface <NUM> may join in its inner end to the third support surface <NUM>. The third support surface <NUM> may be formed between the first support surface <NUM> and the second support surface <NUM>. The third support surface <NUM> may taper from the first support surface <NUM> towards the second support surface <NUM>. Between the second support surface <NUM> and the third support surface <NUM> may be arranged a transitional surface <NUM>.

The oscillation bearing arrangement <NUM> may be arranged on the second support surface <NUM> and the third support surface <NUM> of the inner frame structure <NUM>. The oscillation bearing arrangement <NUM> may be arranged on the inner frame structure <NUM> on the second support surface <NUM> and third support surface <NUM>, and between the first support surface <NUM> and an end plate <NUM>. The end plate <NUM> may be arranged to the end <NUM> of the inner frame structure <NUM>.

In an embodiment, the second support surface <NUM> may form a seat to the inner seat <NUM> of the second bushing <NUM>.

In an embodiment, the third support surface <NUM> may form a seat to the inner seat <NUM> of the first bushing <NUM>.

In an embodiment, at least one inner seat, the inner seat <NUM> of the first bushing <NUM> or the inner seat <NUM> of the second bushing <NUM>, may be adjustable in an axial direction. The adjustable inner seat may allow tightening of the oscillation bearing arrangement <NUM>. In an embodiment, the at least one inner seat may be arranged to be adjusted in an axial direction on the support surface of the inner frame structure <NUM>.

In an embodiment of <FIG>, the inner seat <NUM> of the first bushing <NUM> may be arranged to be connected to the inner frame structure <NUM>. In an embodiment, openings or blind holes <NUM>, <NUM> may be arranged on the inner seat <NUM>. In an embodiment, the blind holes <NUM>, <NUM> may be arranged on the first end <NUM> of the inner seat <NUM> facing to the first support surface <NUM> of the inner frame structure <NUM>. In an embodiment, the blind holes may be arranged and divided on a circle on the first end <NUM> of the inner seat <NUM> of the first bushing <NUM>. A plurality of the blind holes <NUM> may be arranged with threads. A connecting bolt <NUM> may be arranged from a boring <NUM> of the inner frame structure <NUM> to the blind hole <NUM> for connecting the inner seat <NUM> to the inner frame structure <NUM>. Some of the blind holes <NUM> may be arranged to receive a pin <NUM>. Pins <NUM> and connecting bolts <NUM> may connect the inner seat <NUM> of the first bushing <NUM> to the inner frame structure <NUM>.

The oscillation bearing arrangement <NUM> may further comprise an outer seat <NUM> for the first bushing <NUM>. The outer seat <NUM> for the first bushing <NUM> may comprise an outer seat surface <NUM>. The first bushing <NUM> may be a tapered bushing. The first bushing <NUM> may be arranged between the inner seat surface <NUM> of inner seat <NUM> of the first bushing <NUM> and the outer seat surface <NUM> of the outer seat <NUM> of the first bushing <NUM>. An outer side surface <NUM> of the first bushing <NUM> may be arranged facing the outer seat surface <NUM> of the outer seat <NUM>. An inner side surface <NUM> of the first bushing <NUM> may be arranged facing the inner seat surface <NUM> of the inner seat <NUM>.

The oscillation bearing arrangement <NUM> may further comprise an outer seat <NUM> for the second bushing <NUM>. The outer seat <NUM> for the second bushing <NUM> may comprise an outer seat surface <NUM>. The second bushing <NUM> may be a tapered bushing. The second bushing <NUM> may be arranged between the inner seat surface <NUM> of the inner seat <NUM> of the second bushing <NUM> and the outer seat surface <NUM> of the outer seat <NUM> of the second bushing <NUM>. An outer side surface <NUM> of the second bushing <NUM> may be arranged facing the outer seat surface <NUM> of the outer seat <NUM>. An inner side surface <NUM> of the second bushing <NUM> may be arranged facing the inner seat surface <NUM> of the inner seat <NUM>.

In an embodiment, the outer seats may be made of metal. In an embodiment, the outer seats may be made of steel. In an embodiment, the outer seats may be made of hardened steel.

The first bushing <NUM> and the second bushing <NUM> may be arranged so that the second end <NUM> of the first bushing <NUM> may be arranged next to the second end <NUM> of the second bushing <NUM>. In an embodiment, the second end <NUM> of the first bushing <NUM> may have the diameter D2 that is smaller than the diameter D1 of the first end <NUM> of the first bushing <NUM>. In an embodiment, the second end <NUM> of the second bushing <NUM> may have the diameter D2 that is smaller than the diameter D1 of the first end <NUM> of the second bushing <NUM>.

In an embodiment, an outer frame structure <NUM> may comprise a through hole from a first side of the outer frame structure <NUM> to a second side of the outer frame structure <NUM>. The through hole of the outer frame structure <NUM> may be arranged for receiving a portion of the inner frame structure <NUM> and the oscillation bearing arrangement <NUM> for enabling relative rotational movement of the outer frame structure <NUM> and the inner frame structure <NUM>.

The outer frame structure <NUM> may comprise a support flange <NUM> arranged to extend from an inner surface of the outer frame structure <NUM>. In an embodiment, the support flange <NUM> may be arranged between a first outer support surface <NUM> and a second outer support surface <NUM>. The outer seat <NUM> of the first bushing <NUM> may be arranged on the first outer support surface <NUM>. The outer seat <NUM> of the second bushing <NUM> may be arranged on the second outer support surface <NUM>.

In an embodiment of <FIG>, the outer seat <NUM> of the first bushing <NUM> may be connected to the outer frame structure <NUM> or may be a part of the outer frame structure <NUM>. The outer seat <NUM> of the second bushing <NUM> may be connected to the outer frame structure <NUM>. In an embodiment, a through hole <NUM> may be arranged through the support flange <NUM>. In an embodiment, a support portion may be arranged on the outer seat <NUM> of the first bushing <NUM>. In an embodiment, a through hole <NUM> may be arranged through the support portion of the outer seat <NUM> of the first bushing <NUM>. In an embodiment, a blind hole <NUM>, optionally with threads, may be arranged in the outer seat <NUM> of the second bushing <NUM>. In an embodiment, a connecting bolt <NUM> may be arranged to connect the outer seat <NUM> of the first bushing <NUM> and the outer seat <NUM> of the second bushing <NUM> to the outer frame structure <NUM>. In an embodiment of <FIG>, the connecting bolt <NUM> may be arranged to extend from a first side of the support portion of the outer seat <NUM> of the first bushing <NUM> through the through hole and through the through hole <NUM> of the support flange <NUM> to the blind hole <NUM> with threads of the outer seat <NUM> of the second bushing <NUM>. By tightening the connecting bolt <NUM>, the outer seat <NUM> of the first bushing <NUM> and the outer seat <NUM> of the second bushing <NUM> tighten against the support flange <NUM>.

In an embodiment, a plurality of through holes <NUM> may be arranged in the support flange <NUM>. In an embodiment, the plurality of through holes <NUM> may be arranged and divided on a circle on the support flange <NUM>. A plurality of blind holes <NUM> may be arranged with threads. Some of the blind holes <NUM> may be arranged to receive a pin. Pins and connecting bolts <NUM> may connect the outer seat <NUM> of the first bushing <NUM> and the outer seat <NUM> of the second bushing <NUM> to the outer frame structure <NUM>. In an embodiment, a first seal <NUM>, such as an O-ring, may be arranged between the outer seat <NUM> of the first bushing <NUM> and the support flange <NUM>. In an embodiment, a first seal <NUM>, such as an O-ring, may be arranged between the outer seat <NUM> of the second bushing <NUM> and the support flange <NUM>.

In an embodiment, the inner seat <NUM> of the first bushing <NUM> or the inner seat <NUM> of the second bushing <NUM> may be arranged on the inner frame structure <NUM> and connected by a locking screw to the inner frame structure <NUM> and the other of the inner seats <NUM> and <NUM>. The inner seat <NUM> of the second bushing <NUM> may be arranged on the inner frame structure <NUM> and connected by an adjustable screw <NUM> to the end plate <NUM> of the oscillation bearing arrangement <NUM>. In an embodiment, the pin <NUM> may be arranged with an adjustment device or the pin <NUM> may be an adjustment screw. In an embodiment of <FIG>, the inner seat <NUM> of the second bushing <NUM> may be adjustable in an axial direction. In an embodiment, the inner seat <NUM> of the second bushing <NUM> may be arranged to be adjustable in relation to the end plate <NUM>.

In an embodiment, the end plate <NUM> may be arranged to the end surface of the inner frame structure <NUM>. In an embodiment, the end plate <NUM> may be arranged to the end of the inner frame structure <NUM> with connecting bolts <NUM>. In an embodiment, blind holes <NUM> with threads may be arranged on the end surface <NUM> of the inner frame structure <NUM>. The end plate <NUM> may be provided with through holes <NUM>. Connecting bolts <NUM> may be arranged to extend from an outer side of the end plate <NUM> through the through holes <NUM> and into the blind holes <NUM> with threads for connecting the end plate <NUM> to the end surface <NUM> of the inner frame structure <NUM>. In an embodiment, the end plate <NUM> may be made of metal. In an embodiment, the end plate <NUM> may be made of steel.

In an embodiment, the end plate <NUM> may extend a distance in a radial direction from the end surface <NUM> of the inner frame structure <NUM> to the outer frame structure <NUM>. In an embodiment, a second seal <NUM>, such as a lip seal, may be arranged on the end plate <NUM> between the end plate <NUM> and the outer frame structure <NUM>. In an embodiment, a second seal <NUM>, such as a lip seal, may be arranged also between the support surface <NUM> of the inner frame structure <NUM> and the outer frame structure <NUM>.

Parts of the oscillation bearing arrangement <NUM> may be seen clearer in <FIG> that is an exploded view of an embodiment of the oscillation bearing arrangement <NUM> arranged with a frame structure of a mobile mining machine <NUM>. The oscillation bearing arrangement <NUM> may be arranged in the frame structure between the front frame <NUM> and the rear frame <NUM>.

<FIG> illustrates an embodiment of the oscillation bearing arrangement <NUM> with the frame structure of the mobile mining machine <NUM>. The oscillation bearing arrangement <NUM> may be arranged between the front frame <NUM> and the rear frame <NUM> of the mobile mining machine <NUM>.

An example of the mobile mining machine <NUM> with a frame structure comprising an oscillation bearing arrangement <NUM> with at least some of the features mentioned above is illustrated in <FIG>. In an embodiment, the mobile mining machine <NUM> may comprise an articulated joint between the front frame <NUM> and the rear frame <NUM>. In an embodiment, the mobile mining machine <NUM> may comprise an oscillation bearing arrangement according to any one of the embodiments mentioned above alone or in combination with other embodiments.

Claim 1:
A mobile mining machine (<NUM>) comprising a front frame (<NUM>), a rear frame (<NUM>), and an articulated joint between the front frame (<NUM>) and the rear frame (<NUM>), the mobile mining machine (<NUM>) comprising an oscillation bearing arrangement (<NUM>), the oscillation bearing arrangement (<NUM>) comprising:
an inner frame structure (<NUM>) connected to the rear frame (<NUM>) of the mobile mining machine (<NUM>);
an outer frame structure (<NUM>) connected to the front frame (<NUM>) of the mobile mining machine (<NUM>);
a first bearing structure arranged between the inner frame structure (<NUM>) and the outer frame structure (<NUM>), the first bearing structure is a tapered plain bearing comprising a first bushing (<NUM>), a first inner seat (<NUM>) arranged between the inner frame structure (<NUM>) and the first bushing (<NUM>), and a first outer seat (<NUM>) arranged between the outer frame structure (<NUM>) and the first bushing (<NUM>);
a second bearing structure arranged between the inner frame structure (<NUM>) and the outer frame structure (<NUM>), the second bearing structure is a tapered plain bearing comprising a second bushing (<NUM>), a second inner seat (<NUM>) arranged between the inner frame structure (<NUM>) and the second bushing (<NUM>), and a second outer seat (<NUM>) arranged between the outer frame structure (<NUM>) and the second bushing (<NUM>);
wherein the oscillation bearing arrangement is arranged to allow a relative tilting movement between the inner frame structure (<NUM>) and the outer frame structure (<NUM>) along a longitudinal axis of the mobile mining machine (<NUM>).