Spindle and rolling equipment equipped with the spindle

Abstract

The main shaft for transmitting a rotational driving force to a rolling roll includes: a concave coupling portion having, at one end side, a fitting concave portion capable of receiving a fitting convex portion of a convex coupling portion; and a rotor joint provided at the other end side of the concave coupling portion and including an annular rotating portion configured to rotate together with the concave coupling portion and an annular stationary portion located on the outer peripheral side of the annular rotating portion. The concave coupling portion includes a pair of protruding portions at the one end side, and the pair of protruding portions respectively have opposing surfaces defining the fitting concave portion. The concave coupling portion has a plurality of oil supply paths for supplying oil to the fitting concave portion. The rotor joint has a plurality of annular oil paths each communicating with any one of the plurality of oil supply paths. The plurality of oil supply paths include at least one oil supply path provided corresponding to each of four regions obtained by dividing the fitting concave portion by a center line between the pair of opposing surfaces and a straight line orthogonal to the center line in a cross section of the main shaft orthogonal to the axial direction. The at least one oil supply path provided corresponding to one of the four regions communicates with an annular oil path different from the annular oil path that the at least one oil supply path provided corresponding to a region adjacent to the same one of the four regions communicates with among the plurality of annular oil paths.

Description

Technical Field

[0001] The present invention relates to a main shaft and a rolling mill equipped with the main shaft. Background Art

[0002] In a rolling mill such as a steel plate rolling mill, a main shaft is provided between a motor and a rolling roll in order to transmit the driving force of the motor to the rolling roll.

[0003] Patent Document 1 discloses a slide plate type main shaft universal joint equipped with a slipper metal. The main shaft joint includes a main shaft coupling (concave coupling portion) provided on the motor side, a fork end (convex coupling portion) provided on the rolling roll side and inserted into the engaging concave portion of the main shaft coupling, and a slipper metal provided between the main shaft coupling and the fork end in their engaging portion. The slipper metal slides with the main shaft coupling and the fork end, thereby allowing the rotation axis of the rolling roll to be inclined with respect to the rotation axis of the motor and transmitting the rotational driving force of the motor to the rolling roll.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Utility Model Laid-Open Publication No. 61-55518 Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, in the engaging portion between the concave coupling portion and the convex coupling portion of the main shaft, there are a circumferential region (high load region) mainly responsible for torque transmission and a circumferential region (low load region) where the torque transmission amount is relatively small. During operation, there is a tendency that the gap between members becomes narrow in the high load region and relatively wide in the low load region. Therefore, it is relatively difficult to supply lubricating oil (oil) to the high load region where the gap between members is relatively narrow. Therefore, the following problems may occur: when attempting to supply sufficient lubricating oil to the engaging portion of the coupling, an excessive amount of lubricating oil is supplied to the low load region, or insufficient lubricating oil is supplied to the high load region.

[0009] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a main shaft and a rolling mill equipped with the main shaft that can appropriately supply oil to the engaging portion of the coupling.

[0010] Means for Solving the Problems

[0011] At least one embodiment of the main shaft of the present invention is for transmitting a rotational driving force to a rolling roll, and

[0012] the main shaft includes:

[0013] A concave coupling portion having a fitting concave portion at one end side that can receive a fitting convex portion of a convex coupling portion; and

[0014] A rotor joint provided on the other end side of the concave coupling portion, and including an annular rotating portion configured to rotate together with the concave coupling portion and an annular stationary portion located on the outer peripheral side of the annular rotating portion,

[0015] The concave coupling portion includes a pair of protruding portions on the one end side, and the pair of protruding portions each have an opposing surface that defines the fitting concave portion,

[0016] The concave coupling portion has a plurality of oil supply paths for supplying oil to the fitting concave portion,

[0017] The rotor joint has a plurality of annular oil paths each communicating with any one of the plurality of oil supply paths,

[0018] The plurality of oil supply paths include at least one oil supply path provided corresponding to each of 4 regions obtained by dividing the fitting concave portion by a center line between the pair of opposing surfaces and a straight line orthogonal to the center line in a cross section of the main shaft orthogonal to the axial direction,

[0019] The at least one oil supply path provided corresponding to one of the 4 regions communicates with an annular oil path among the plurality of annular oil paths that is different from the annular oil path that the at least one oil supply path provided corresponding to a region adjacent to the same one of the 4 regions communicates with.

[0020] In addition, a rolling mill apparatus according to at least one embodiment of the present invention includes:

[0021] The above-described main shaft; and

[0022] A plurality of oil supply lines that are connected to the main shaft and are configured to supply oil to the plurality of annular oil paths respectively.

[0023] Advantageous Effects of the Invention

[0024] According to at least one embodiment of the present invention, there is provided a main shaft capable of appropriately supplying oil to a fitting portion of a coupling and a rolling mill apparatus including the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a rolling mill apparatus according to an embodiment.

[0026] Figure 2 is a schematic diagram of a main shaft according to an embodiment.

[0027] Figure 3 is a diagram showing Figure 2 a cross section taken along line A-A of

[0028] Figure 4 is a view showing Figure 2 the B-B cross section.

[0029] Figure 5 is a view showing Figure 2 the C-C cross section.

[0030] Figure 6 is Figure 2 a partial cross-sectional view along the axial direction of the main shaft shown.

[0031] Figure 7 is a schematic structural diagram of a rolling device according to an embodiment.

[0032] Figure 8 is a schematic structural diagram of a rolling device according to an embodiment.

[0033] Figure 9 is a schematic structural diagram of a rolling device according to an embodiment. Detailed Embodiments

[0034] Hereinafter, several embodiments of the present invention will be described with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the constituent parts described as embodiments or shown in the drawings are not intended to limit the scope of the present invention thereto, but are merely illustrative examples.

[0035] (Structure of Rolling Device)

[0036] Figure 1 is a schematic structural diagram of a rolling device of a main shaft to which several embodiments are applied. The rolling device 10 shown in this figure includes a pair of rolling rolls (work rolls) 12 arranged to sandwich a rolling material, and a pair of backup rolls 18 arranged to sandwich the pair of rolling rolls 12. The pair of rolling rolls 12 are rotatably supported by axle boxes 14 and 16 provided at the shaft end portions of the rolling rolls 12 in a housing (not shown). The pair of backup rolls 18 are rotatably supported by axle boxes 20 and 22 provided at the shaft end portions of the backup rolls 18 in the housing.

[0037] The rolling device 10 includes: a drive device 24 including a motor for generating a driving force for rotationally driving the pair of rolling rolls 12; and a pair of main shafts 26 for transmitting the driving force generated by the drive device 24 to the pair of rolling rolls 12. The drive device 24 includes a pair of drive shafts 30 for transmitting the rotational driving force generated by the motor, and one end portions of the pair of main shafts 26 are respectively fitted to the pair of drive shafts 30. The other end portions of the pair of main shafts 26 are respectively connected to the shaft end portions of the pair of rolling rolls 12 via couplings 28 (including a concave coupling portion 32 and a convex coupling portion 36) described later.

[0038] It should be noted that the rolling equipment 10 includes equipment for supplying oil such as lubricating oil to each component equipment of the rolling equipment 10 (such as an oil supply line connected to the main shaft 26 described later).

[0039] (Structure of the main shaft)

[0040] Figure 2 It is a schematic diagram of the main shaft 26 of an embodiment. Figures 3 to 5 They are respectively diagrams showing Figure 2 a cross-section of the main shaft 26 shown that is orthogonal to the axial direction. Figure 3 It is a diagram showing Figure 2 the A-A cross-section of Figure 4 It is a diagram showing Figure 2 the B-B cross-section of Figure 5 It is a diagram showing Figure 2 the C-C cross-section of Figure 6 It is Figure 2 a partial cross-sectional view of the main shaft shown along the axial direction.

[0041] As Figure 2 shown, the main shaft 26 includes a concave coupling portion 32 that can be engaged with a convex coupling portion 36 provided at the shaft end of the rolling roll 12 on one end side, and a rotor joint 60 located on the other end side of the concave coupling portion 32.

[0042] As Figure 2 and Figure 3 shown, the concave coupling portion 32 has a pair of protruding portions 34A, 34B that protrude axially on one end side. The pair of protruding portions 34A, 34B respectively have opposing surfaces 35A, 35B that face each other. A fitting recess 33 defined by the pair of opposing surfaces 35A, 35B is formed between the protruding portion 34A and the protruding portion 34B. The fitting recess 33 has a shape that is recessed axially. The fitting recess 33 can receive the fitting convex portion 38 of the convex coupling portion 36.

[0043] The fitting convex portion 38 of the convex coupling portion 36 includes a pair of protruding portions 37A, 37B that protrude axially to form a fork portion. As Figure 3 shown, the pair of protruding portions 37A, 37B are arranged along the center line Lc between the pair of opposing surfaces 35A, 35B of the concave coupling portion 32 in a cross-section orthogonal to the axial direction of the main shaft 26. The fitting convex portion 38 of the convex coupling portion 36 is configured to be inserted into the fitting recess of the concave coupling portion 32.

[0044] The main shaft 26 further includes a pin 42 provided between the pair of protruding portions 34A, 34B of the concave coupling portion 32, and a pair of sliding metals 40A, 40B supported at both ends of the pin 42.

[0045] As Figure 3As shown, the pin 42 is disposed between a pair of protruding portions 34A and 34B of the concave coupling portion 32 in such a manner as to pass between a pair of protruding portions 37A and 37B of the convex coupling portion 36 and extends along a straight line Ln orthogonal to the center line Lc in a cross-section orthogonal to the axial direction of the main shaft 26. It should be noted that in Figure 3 the straight line Ln is a straight line passing through the rotation axis O of the main shaft 26 and orthogonal to the above-mentioned center line Lc.

[0046] Sliding metals 40A and 40B are disposed between the opposing surfaces 35A and 35B of the concave coupling portion 32 and the protruding portions 37A and 37B of the convex coupling portion 36. The sliding metals 40A and 40B have convex portions 98 protruding toward the protruding portions 34A and 34B of the concave coupling portion 32 and holes 52 into which both ends of the pin 42 can be engaged. Both ends of the pin 42 are inserted into the holes 52 of the sliding metals 40A and 40B, and the convex portions 98 are engaged with the concave portions 31 provided on the opposing surfaces 35A and 35B of the concave coupling portion 32.

[0047] In this way, with the sliding metals 40A and 40B interposed therebetween, the concave coupling portion 32 and the convex coupling portion 36 are engaged. Therefore, during the operation of the rolling equipment 10, the rotational driving force of the motor (drive device 24) is transmitted from the protruding portions 34A and 34B of the concave coupling portion 32 of the main shaft 26 to the protruding portions 37A and 37B of the convex coupling portion 36 via the sliding metals 40A and 40B. Thereby, the rotational driving force is transmitted to the rolling roll 12 connected to the convex coupling portion 36.

[0048] The sliding metals 40A and 40B each have a first surface 41 capable of sliding with the opposing surfaces 35A and 35B of the protruding portions 34A and 34B of the concave coupling portion 32. In addition, the sliding metals 40A and 40B each have a second surface 43 capable of sliding with the surfaces 39A and 39B of the protruding portions 37A and 37B of the convex coupling portion 36. As Figure 2 shown, the opposing surfaces 35A and 35B of the concave coupling portion 32 and the first surfaces 41 of the sliding metals 40A and 40B have a curved surface shape. In addition, the surfaces 39A and 39B of the convex coupling portion 36 and the second surfaces 43 of the sliding metals 40A and 40B have a flat surface shape. Therefore, by sliding the opposing surfaces 35A and 35B of the concave coupling portion 32 with the first surfaces 41 of the sliding metals 40A and 40B, and the surfaces 39A and 39B of the convex coupling portion 36 with the second surfaces 43 of the sliding metals 40A and 40B respectively, the rotational driving force can be transmitted in a state where the rotation axis of the main shaft 26 is inclined with respect to the rotation axis of the rolling roll 12.

[0049] As Figure 3As shown, in the engaging recess 33, a first space 94 (94a to 94d) is formed between the opposing surfaces 35A, 35B of the protruding portions 34A, 34B of the concave coupling portion 32 and the first surfaces 41 of the sliding metals 40A, 40B. The first space 94 may also be formed by grooves provided on the first surfaces 41 of the sliding metals 40A, 40B. In the engaging recess 33, a second space 96 (96a to 96d) is formed between the surfaces 39A, 39B of the convex coupling portion 36 and the second surfaces 43 of the sliding metals 40A, 40B. The second space 96 may also be formed by grooves provided on the second surfaces 43 of the sliding metals 40A, 40B.

[0050] Here, in a cross-section orthogonal to the axial direction of the main shaft 26, four regions obtained by dividing the engaging recess 33 using the center line Lc of the pair of opposing surfaces 35A, 35B and a straight line Ln orthogonal to the center line Lc are defined as regions A1 to A4 in the order of circumferential arrangement (see Figure 3 ).

[0051] The concave coupling portion 32 has a plurality of oil supply paths 90, 92 for supplying lubricating oil (oil) to the engaging recess 33. The plurality of oil supply paths 90 include oil supply paths 90a to 90d provided corresponding to the four regions A1 to A4. The plurality of oil supply paths 92 include oil supply paths 92a to 92d provided corresponding to the four regions A1 to A4. Each of the plurality of oil supply paths 90, 92 communicates with any one of the plurality of annular oil paths 101, 102 formed in the rotor joint 60.

[0052] It should be noted that, in Figures 2 to 6 the illustrated embodiment shown, two annular oil paths 101, 102 are formed in the rotor joint 60. In other embodiments, three or more annular oil paths may be formed in the rotor joint 60. It should be noted that, in Figure 8 and Figure 9 the exemplary embodiments shown later, four annular oil paths 101 to 104 are formed in the rotor joint 60.

[0053] It should be noted that, in Figure 2 the exemplary embodiment shown, the concave coupling portion 32 is disposed adjacent to the rotor joint 60. As will be described later, any one of the plurality of oil supply paths 90, 92 communicates with any one of the plurality of annular oil paths 101, 102 via an axial oil path 44 formed in the concave coupling portion 32. In several other embodiments, the concave coupling portion 32 and the rotor joint 60 may be arranged separately without being adjacent to each other. In this case, any one of the plurality of oil supply paths 90, 92 and any one of the plurality of annular oil paths 101, 102 may also communicate via a pipe provided between the concave coupling portion 32 and the rotor joint 60.

[0054] As Figure 2 As shown in FIG. 3, the plurality of oil supply passages 90 (90a to 90d) are first passages provided in a manner of communicating with the above-described first spaces 94 (94a to 94d). The plurality of oil supply passages 90 (90a to 90d) are respectively formed in the concave coupling portion 32, connected to the axial oil passages 44 (44a to 44d) extending along the axial direction, and extend from the axial oil passages 44 toward the first spaces 94 (94a to 94d) in a direction orthogonal to the center line Lc. In addition, the plurality of oil supply passages 90 communicate with any one of the above-described annular oil passages 101 and 102 via the axial oil passages 44. Oil from any one of the annular oil passages 101 and 102 is respectively supplied to the first spaces 94 (94a to 94d) via the plurality of oil supply passages 90 (90a to 90d). It should be noted that the first spaces 94a to 94d are provided corresponding to the four regions A1 to A4.

[0055] In addition, the plurality of oil supply passages 92 (92a to 92d) are second passages provided in a manner of communicating with the above-described second spaces 96 (96a to 96d). The plurality of oil supply passages 92 (92a to 92d) are respectively formed in the concave coupling portion 32, connected to the axial oil passages 46 (46a to 46d) extending along the axial direction, and extend from the axial oil passages 46 toward the second spaces 96 (96a to 96d) in a direction orthogonal to the center line Lc. In addition, the plurality of oil supply passages 92 communicate with any one of the above-described annular oil passages 101 and 102 via the axial oil passages 46. In addition, oil supply passages 93 (93a to 93d) communicating with the above-described oil supply passages 92 (92a to 92d) are provided in the sliding metals 40A and 40B. Oil from any one of the annular oil passages 101 and 102 is respectively supplied to the second spaces 96 (96a to 96d) via the plurality of oil supply passages 92 (92a to 92d) and the plurality of oil supply passages 93 (93a to 93d). It should be noted that the second spaces 96a to 96d are provided corresponding to the four regions A1 to A4.

[0056] In several embodiments, as Figure 3 shown, the plurality of axial oil passages 44 and 46 provided in the concave coupling portion 32 are arranged offset from each other in the circumferential direction. In this case, since the plurality of axial oil passages 44 and 46 are arranged offset from each other in the circumferential direction, the machining for connecting the plurality of axial oil passages 44 and 46 to the plurality of annular oil passages 101 and 102 respectively is relatively easy.

[0057] As Figure 2 , Figure 4 and Figure 5As shown, the rotor joint 60 includes an annular rotating portion 62 provided on the other end side of the concave coupling portion 32 (the side opposite to the one end side where the engaging concave portion 33 is provided), and an annular stationary portion 76 located on the outer peripheral side of the annular rotating portion 62. The annular rotating portion 62 is configured to rotate together with the concave coupling portion 32.

[0058] The rotor joint 60 has a plurality of annular oil passages 101, 102 provided along the circumferential direction. Each of the plurality of annular oil passages 101, 102 communicates with any one of the plurality of oil supply passages 90 (90a to 90d), 92 (92a to 92d).

[0059] The annular stationary portion 76 includes a plurality of oil supply ports 84, 86 for respectively supplying oil to the plurality of annular oil passages 101, 102. Oil supply lines 110 (see Figures 7 to 9 ) are respectively connected to the plurality of oil supply ports 84, 86. It should be noted that, as Figure 4 and Figure 5 shown, a plurality of oil supply ports 84, 86 may also be provided for each of the annular oil passages 101, 102. The plurality of oil supply ports 84, 86 may also be arranged at intervals along the circumferential direction.

[0060] The plurality of annular oil passages 101, 102 are provided between the outer peripheral surface 63 of the annular rotating portion 62 and the inner peripheral surface 77 of the annular stationary portion 76. Therefore, while rotating the concave coupling portion 32 and the annular rotating portion 62, the oil from the oil supply ports 84, 86 provided in the annular stationary portion 76 can be appropriately supplied to the engaging concave portion 33 of the concave coupling portion 32.

[0061] The plurality of annular oil passages 101, 102 may also be at least partially formed by circumferential grooves provided on at least one of the outer peripheral surface 63 of the annular rotating portion 62 and the inner peripheral surface 77 of the annular stationary portion 76.

[0062] In Figure 6 the illustrated exemplary embodiment shown, the annular oil passage 101 is formed by an annular circumferential groove 64 provided on the outer peripheral surface 63 of the annular rotating portion 62 and an annular circumferential groove 80 provided on the inner peripheral surface 77 of the annular stationary portion 76. In addition, the annular oil passage 102 is formed by an annular circumferential groove 70 provided on the outer peripheral surface 63 of the annular rotating portion 62 and an annular circumferential groove 82 provided on the inner peripheral surface 77 of the annular stationary portion 76.

[0063] It should be noted that in several embodiments, the annular oil passage 101 may also be formed by a circumferential groove provided on the outer peripheral surface 63 of the annular rotating portion 62 and extending locally in the circumferential direction, or a circumferential groove provided on the inner peripheral surface 77 of the annular stationary portion 76 and extending locally in the circumferential direction.

[0064] In several embodiments, asFigure 2 and Figure 6 As shown in Figure 6 , a plurality of annular oil passages 101, 102 are arranged axially offset from each other. In this way, lubricating oil from different supply sources can be appropriately supplied to the engaging recess 33 of the female coupling portion 32 via the plurality of annular oil passages 101, 102 arranged axially offset from each other.

[0065] The annular oil passage 101 communicates with either one of the axial oil passages 44, 46 of the female coupling portion 32 via the axial passages 68, 69 provided in the annular rotating portion 62 and the radial passages 66, 67 provided between the annular oil passage 101 and the axial passages 68, 69. Therefore, the oil supplied through the oil supply port 84 is supplied to the engaging recess 33 (such as the first space 94 or the second space 96, etc.) of the female coupling portion 32 via these passages.

[0066] It should be noted that, in Figures 2 to 6 the exemplary embodiment shown in Figures 2 to 6 , the axial passage 68 of the annular rotating portion 62 is connected to the axial oil passages 44a, 44c of the female coupling portion, and the axial passage 69 of the annular rotating portion 62 is connected to the axial oil passages 46a, 46c of the female coupling portion.

[0067] The annular oil passage 102 communicates with either one of the axial oil passages 44, 46 of the female coupling portion 32 via the axial passages 74, 75 provided in the annular rotating portion 62 and the radial passages 72, 73 provided between the annular oil passage 102 and the axial passages 74, 75. Therefore, the oil supplied through the oil supply port 86 is supplied to the engaging recess 33 (such as the first space 94 or the second space 96, etc.) of the female coupling portion 32 via these passages.

[0068] It should be noted that, in Figures 2 to 6 the exemplary embodiment shown in Figures 2 to 6 , the axial passage 74 of the annular rotating portion 62 is connected to the axial oil passages 44b, 44d of the female coupling portion, and the axial passage 75 of the annular rotating portion 62 is connected to the axial oil passages 46b, 46d of the female coupling portion.

[0069] Figures 7 to 9 They are schematic structural diagrams of a rolling mill including a main shaft of an embodiment respectively. It should be noted that Figures 7 to 9 includes a schematic diagram of a cross-section of the female coupling portion 32 identical to that in Figure 3 and a schematic diagram obtained by developing the rotor joint 60 in the circumferential direction. The annular oil passages (101 - 104) provided in the rotor joint 60 are shown linearly.

[0070] Figure 7 is a schematic illustration of Figures 2 to 6 the exemplary embodiment shown in Figures 2 to 6 . Figure 8 and Figure 9The exemplary embodiment shown is basically the same in structure as Figure 7 that shown, but is different from the embodiment shown in that the rotor joint 60 is provided with four annular oil passages 101 to 104. Figure 7 The exemplary embodiment shown is different in that the rotor joint 60 is provided with four annular oil passages 101 to 104.

[0071] In Figures 7 to 9 the embodiment shown, the rolling equipment 10 includes the above-mentioned main shaft 26 and a plurality of oil supply lines 110A to 110D (110A and 110B in Figure 7 ) that are connected to the main shaft 26 and used to supply oil to the plurality of annular oil passages 101 to 104 (101 and 102 in Figure 7 ).

[0072] In several embodiments, for example, as shown in Figures 7 to 9 , the oil supply passages 90 and 92 provided corresponding to one of the above-mentioned four regions A1 to A4 (the four regions obtained by dividing the engaging concave portion 33 of the female coupling portion 32 by the center line Lc and the straight line Ln) communicate with an annular oil passage different from the annular oil passage with which the oil supply passages 90 and 92 provided corresponding to the region adjacent to the one region communicate.

[0073] Specifically, in Figure 7 the exemplary embodiment shown, the oil supply passage 90a and the oil supply passage 92a provided corresponding to the region A1 communicate with the annular oil passage 101. The annular oil passage 101 is an annular oil passage different from the annular oil passage 102 with which the oil supply passages 90b and 90d and the oil supply passages 92b and 92d provided corresponding to the regions A2 and A4 adjacent to the region A1 communicate.

[0074] In addition, in Figure 8 the exemplary embodiment shown, the oil supply passage 90a provided corresponding to the region A1 communicates with the annular oil passage 101, and the oil supply passage 92a communicates with the annular oil passage 102. These annular oil passages 101 and 102 are annular oil passages different from the annular oil passage 103 with which the oil supply passages 90b and 90d provided corresponding to the regions A2 and A4 adjacent to the region A1 communicate and the annular oil passage 104 with which the oil supply passages 92b and 92d communicate, respectively.

[0075] In addition, in Figure 9In the exemplary embodiment shown, the oil supply passages 90a and 92a provided corresponding to the region A1 communicate with the annular oil passage 101. This annular oil passage 101 is a flow path different from the annular oil passage 103 that communicates with the oil supply passages 90b and 92b provided corresponding to the region A2 adjacent to the same region A1. Further, the annular oil passage 101 is a flow path different from the annular oil passage 104 that communicates with the oil supply passages 90d and 92d provided corresponding to the region A4 adjacent to the same region A1.

[0076] Further, regarding Figures 7 to 9 the embodiment shown, the same description as above also applies to the regions A2 to A4 other than the region A1.

[0077] Of the four regions A1 to A4 at the engaging portion of the concave coupling portion 32 and the convex coupling portion 36, two regions (A1 and A2, A2 and A3, A3 and A4, or A4 and A1) adjacent to each other in the circumferential direction, one is a high-load region where the torque transmission amount during operation is relatively large, and the other is a low-load region where the torque transmission amount during operation is relatively small. For example, when the regions A1 and A3 are high-load regions, the regions A2 and A4 are low-load regions.

[0078] In the above embodiment, the oil supply passages 90a to 90d and 92a to 92d provided corresponding to the adjacent regions (one is a high-load region and the other is a low-load region) among the four regions communicate with the different annular oil passages 101 to 104. That is, it is possible to supply oil from different oil supply sources to the oil supply passages provided corresponding to the high-load region and the low-load region. Therefore, it is possible to appropriately supply lubricating oil to both the high-load region and the low-load region.

[0079] In several embodiments, for example, as Figure 7 and Figure 8 shown, at least one oil supply passage 90, 92 provided corresponding to one of the four regions A1 to A4 communicates with the same annular oil passage as the annular oil passage that any one of the oil supply passages 90, 92 provided corresponding to the region not adjacent to the same one of the four regions A1 to A4 communicates with.

[0080] Specifically, in Figure 7 the exemplary embodiment shown, the oil supply passages 90a, 92a provided corresponding to the region A1 among the four regions A1 to A4 each communicate with the annular oil passage 101. This annular oil passage 101 is the same annular oil passage as the annular oil passage that the oil supply passages 90c, 92c provided corresponding to the region A3 not adjacent to the region A1 each communicate with.

[0081] Further, inFigure 8 In the exemplary embodiment shown, the oil supply passage 90a provided corresponding to the region A1 among the four regions A1 to A4 communicates with the annular oil passage 101. This annular oil passage 101 is the same annular oil passage as the annular oil passage 101 that communicates with the oil supply passage 90c provided corresponding to the region A3 that is not adjacent to the same region A1. In addition, the oil supply passage 92a provided corresponding to the region A1 communicates with the annular oil passage 102. This annular oil passage 102 is the same annular oil passage as the annular oil passage 102 that communicates with the oil supply passage 92c provided corresponding to the region A3 that is not adjacent to the same region A1.

[0082] In addition, regarding Figures 7 to 8 the embodiment shown, the same description as above also applies to the regions A2 to A4 other than the region A1.

[0083] Among the four regions A1 to A4, two regions that are not adjacent to each other in the circumferential direction (two regions located on both sides across the rotation axis O of the main shaft 26; for example, region A1 and A3, or A2 and A4) are both high-load regions or both low-load regions. According to the above embodiment, the oil supply passages (90a, 92a) provided corresponding to one region (for example, A1) communicate with the annular oil passage (101) that communicates with the oil supply passages (90c, 92c) provided corresponding to the region (for example, A3) that is not adjacent to the same one region. Therefore, it is possible to at least partially make the oil supply paths to these regions common. Thus, it is possible to appropriately supply lubricating oil to both the high-load region and the low-load region with a relatively simple structure.

[0084] In several embodiments, for example, as Figure 9 shown, the oil supply passages 90 and 92 provided corresponding to one of the four regions A1 to A4 respectively communicate with annular oil passages different from the annular oil passages that the oil supply passages 90 and 92 provided corresponding to the region that is not adjacent to the same one of the four regions A1 to A4 communicate with.

[0085] Specifically, in Figure 9 the exemplary embodiment shown, the oil supply passages 90a and 92a provided corresponding to the region A1 communicate with the annular oil passage 101. This annular oil passage 101 is an annular oil passage different from the annular oil passage 103 that the oil supply passages 90c and 92c provided corresponding to the region A3 that is not adjacent to the region A1 communicate with.

[0086] In addition, regarding Figure 9 the embodiment shown, the same description as above also applies to the regions A2 to A4 other than the region A1.

[0087] According to the above-described embodiments, the oil supply paths (90a, 92a) provided corresponding to one region (e.g., A1) and the oil supply paths (90c, 92c) provided corresponding to a region (A3) not adjacent to the one region communicate with different annular oil paths (101, 103), so that the oil supply systems to these regions can be separated. That is, the oil supply systems can be separated between high-load regions or between low-load regions (e.g., between region A1 and region A3), and thus lubricating oil suitable for the pressure levels of the four regions A1 to A4 can be supplied respectively. Therefore, it is easy to supply lubricating oil more appropriately to each region.

[0088] In several embodiments, for example, as Figure 8 shown, in each of the four regions A1 to A4, a first passage (oil supply path 90 communicating with the first space 94) and a second passage (oil supply path 92 communicating with the second space 96) communicate with different ones of the plurality of annular oil paths 101 to 104 respectively.

[0089] Specifically, in Figure 8 the illustrated exemplary embodiment shown, for example, in region A1, the oil supply path 90a (first passage) communicating with the first space 94a communicates with the annular oil path 101. This annular oil path 101 is different from the annular oil path 102 with which the oil supply path 92a (second passage) communicating with the second space 96a in region A1 communicates.

[0090] In addition, regarding Figure 8 the embodiment shown, the same description as above is also applicable to regions A2 to A4 other than region A1.

[0091] According to the above-described embodiments, the first passage (oil supply path 90) communicating with the first space 94 and the second passage (oil supply path 92) communicating with the second space 96 communicate with different ones of the annular oil paths 101 to 104 respectively, so that lubricating oil with different pressure levels can be supplied to the first space 94 and the second space 96. Therefore, it is easy to supply lubricating oil more appropriately to each of the first space 94 and the second space 96.

[0092] In several embodiments, for example, it may also be as Figures 7 to 9 shown that the rolling equipment 10 includes a plurality of pumps 112A to 112D provided in a plurality of oil supply lines 110A to 110D respectively.

[0093] In this case, the pumps 112A to 112D are provided separately in the plurality of oil supply lines 110A to 110D, so that the pressure levels of the respective oil supply lines 110A to 110D can be adjusted separately. Therefore, lubricating oil can be supplied appropriately to both the high-load regions and the low-load regions among the four regions.

[0094] In several embodiments, a throttle portion may also be provided in any one of the plurality of oil supply lines 110A to 110D. By providing a throttle portion in any one of the plurality of oil supply lines 110, the amount of oil supplied from the oil supply line 110 to the concave coupling portion 32 is throttled, whereby the balance of the oil supply amounts based on the plurality of oil supply lines 110A to 110D can be adjusted.

[0095] In several embodiments, a distribution valve for distributing and supplying oil may also be provided in two or more of the plurality of oil supply lines 110A to 110D. In this case, the distribution valve distributes oil to two or more oil supply lines, so that oil can be supplied to the plurality of oil supply lines at an appropriate distribution ratio.

[0096] In several embodiments, for example, as Figures 7 to 9 shown, the rolling equipment 10 is provided with a switching valve 114 capable of switching the connection destinations of the plurality of annular oil passages 101 to 104 between the plurality of oil supply lines 110A to 110D.

[0097] In Figure 7 the illustrated exemplary embodiment shown, the rolling equipment 10 is provided with a switching valve 114 capable of switching the connection destinations of the annular oil passage 101 and the annular oil passage 102 between the oil supply lines 110A and 110B.

[0098] In Figure 8 and Figure 9 the illustrated exemplary embodiment shown, the rolling equipment 10 is provided with a switching valve 114A capable of switching the connection destinations of the annular oil passage 101 and the annular oil passage 103 between the oil supply lines 110A and 110B and a switching valve 114B capable of switching the connection destinations of the annular oil passage 102 and the annular oil passage 104 between the oil supply lines 110C and 110D.

[0099] In a reversible rolling device configured to roll while reciprocating a material, in the forward path and the return path of the material, the rotation directions of the rolling rolls 12 and the main shaft 26 become reverse. Further, in the forward path and the return path of the material, the high-load regions and the low-load regions of the four regions A1 to A4 in the engaging concave portion 33 of the concave coupling portion 32 are swapped. For example, when regions A1 and A3 are high-load regions and regions A2 and A4 are low-load regions in the forward path, in the return path, regions A1 and A3 become low-load regions, and regions A2 and A4 become high-load regions.

[0100] Regarding this point, in the above-described embodiment, switching valves 114A and 114B are provided that can switch the connection destinations of the plurality of annular oil passages 101 to 104 among the plurality of oil supply lines 110A to 110D. Therefore, in response to a change in the rotation direction of the rolling roll 12 and the main shaft 26, the switching valve 114 can be appropriately operated to switch the supply destination regions A1 to A4 of the oil from the respective oil supply lines 110A to 110D. Thus, in a reversible rolling apparatus, it is possible to appropriately supply lubricating oil to both the high-load region and the low-load region on both the forward path and the return path of the material.

[0101] It should be noted that, in the case where the switching valve 114 is provided, the above-described throttle portion is provided in the oil supply lines 110A to 110D at a position upstream of the switching valve 114.

[0102] In addition, in the case where the switching valve 114 is provided, the above-described distribution valve is provided in the oil supply lines 110A to 110D at a position upstream of the switching valve 114.

[0103] In several embodiments, the plurality of oil supply lines 110A to 110D are provided independently of each other. That is, each of the plurality of oil supply lines 110A to 110D (for example, the oil supply line 110A) is not an oil supply line branched from other oil supply lines (the oil supply lines 110B to 110D).

[0104] In this case, since the plurality of oil supply lines 110A to 110D are provided independently of each other, it is possible to appropriately maintain the pressure levels of the oil supply systems corresponding to the respective annular oil passages 101 to 104. Thus, it is possible to appropriately supply lubricating oil to both the high-load region and the low-load region of the engaging recess 33 of the concave coupling portion 32.

[0105] In several embodiments, a sealing portion for reducing oil leakage between the annular oil passages may be provided between adjacent annular oil passages among the plurality of annular oil passages 101 to 104. For example, in Figure 6 the illustrated embodiment, a sealing portion 88 is provided between the axially adjacent annular oil passages 101 and 102.

[0106] By providing the above-described sealing portion 88, it becomes easy to appropriately maintain the pressure levels of the oil supply systems corresponding to the respective annular oil passages 101 and 102.

[0107] It should be noted that, as shown in Figure 6 a sealing portion 89 for reducing oil leakage from the annular oil passages 101, 102, etc. may be provided between the annular rotating portion 62 and the annular stationary portion 76. In addition, as shown in Figure 6As shown, a sealing portion 87 for reducing oil leakage from axial passages 68, 69, etc. is provided between the annular rotating portion 62 and the concave coupling portion 32.

[0108] Hereinafter, an outline of the main shaft of several embodiments and a rolling equipment including the main shaft will be described.

[0109] (1) The main shaft of at least one embodiment of the present invention is used to transmit rotational driving force to a rolling roll, wherein,

[0110] The main shaft includes:

[0111] A concave coupling portion having a fitting recess at one end side that can receive a fitting convex portion of a convex coupling portion; and

[0112] A rotor joint provided at the other end side of the concave coupling portion, and including an annular rotating portion configured to rotate together with the concave coupling portion and an annular stationary portion located on the outer peripheral side of the annular rotating portion,

[0113] The concave coupling portion includes a pair of protruding portions at the one end side, and the pair of protruding portions respectively have opposing surfaces that define the fitting recess,

[0114] The concave coupling portion has a plurality of oil supply passages for supplying oil to the fitting recess,

[0115] The rotor joint has a plurality of annular oil passages each communicating with any one of the plurality of oil supply passages,

[0116] The plurality of oil supply passages include at least one oil supply passage provided corresponding to each of the 4 regions obtained by dividing the fitting recess using a center line between the pair of opposing surfaces and a straight line orthogonal to the center line in a cross section of the main shaft orthogonal to the axial direction,

[0117] The at least one oil supply passage provided corresponding to one of the 4 regions communicates with an annular oil passage different from the annular oil passage that the at least one oil supply passage provided corresponding to a region adjacent to the same one of the 4 regions among the plurality of annular oil passages communicates with.

[0118] One of the two circumferentially adjacent regions among the four regions in the engaging concave portion of the concave coupling portion is a high-load region where the torque transmission amount during operation is relatively large, and the other is a low-load region where the torque transmission amount during operation is relatively small. In the structure of the above (1), the oil supply paths respectively corresponding to the adjacent regions (one is a high-load region and the other is a low-load region) among the four regions communicate with different annular oil paths. That is, it is possible to supply oil from different oil supply sources to the oil supply paths respectively provided corresponding to the high-load region and the low-load region. Therefore, it is possible to appropriately supply lubricating oil to both the high-load region and the low-load region.

[0119] (2) In several embodiments, based on the structure of the above (1),

[0120] Each of the at least one oil supply path provided corresponding to one of the four regions communicates with the same annular oil path as the annular oil path that any one of the at least one oil supply path provided corresponding to the region not adjacent to the same one of the four regions communicates with.

[0121] Both of the two regions among the above four regions that are not adjacent to each other in the circumferential direction (the two regions located on both sides across the rotating shaft) are high-load regions, or both are low-load regions. According to the structure of the above (2), the oil supply path provided corresponding to one region communicates with the annular oil path that the oil supply path provided corresponding to the region not adjacent to the same one region communicates with. Therefore, it is possible to at least partially share the oil supply paths to these regions. Thus, it is possible to appropriately supply lubricating oil to both the high-load region and the low-load region through a relatively simple structure.

[0122] (3) In several embodiments, based on the structure of the above (1),

[0123] Each of the at least one oil supply path provided corresponding to one of the four regions communicates with an annular oil path different from the annular oil paths that the at least one oil supply path provided corresponding to the region not adjacent to the same one region communicates with.

[0124] According to the structure of the above (3), the oil supply path provided corresponding to one region and the oil supply path provided corresponding to the region not adjacent to the same one region communicate with different annular oil paths. Therefore, it is possible to separate the oil supply systems to these regions. That is, it is possible to separate the oil supply systems between high-load regions or between low-load regions. Therefore, it is possible to supply lubricating oils respectively suitable for the pressure levels of the four regions. Thus, it is easier to supply lubricating oil more appropriately to each region.

[0125] (4) In several embodiments, based on any one of the structures in the above (1) to (3),

[0126] the main shaft includes:

[0127] a pin that extends along the straight line within the cross section between the pair of protruding portions; and

[0128] a pair of sliding metals that are supported at both ends of the pin and respectively have a first surface capable of sliding with the opposing surface of the pair of protruding portions and a second surface capable of sliding with the convex coupling portion.

[0129] According to the structure in the above (4), the first surface of the sliding metal and the sliding portion of the concave coupling portion as well as the second surface of the sliding metal and the sliding portion of the convex coupling portion are respectively included in the above four regions. Thus, lubricating oil can be appropriately supplied to these sliding portions.

[0130] (5) In several embodiments, based on the structure in the above (4),

[0131] the at least one oil supply path provided corresponding to each of the four regions includes:

[0132] a first passage that communicates with a first space between the opposing surface of the protruding portion and the first surface of the sliding metal; and

[0133] a second passage that communicates with a second space between the convex coupling portion and the second surface of the sliding metal.

[0134] According to the structure in the above (5), lubricating oil can be supplied to the first space via the first passage that communicates with the first space between the protruding portion (concave coupling portion) and the first surface of the sliding metal, and lubricating oil can be supplied to the second space via the second passage that communicates with the second space between the convex coupling portion and the second surface of the sliding metal. Thus, lubricating oil can be appropriately supplied to the engaging portion between the concave coupling portion and the convex coupling portion.

[0135] (6) In several embodiments, based on the structure in the above (5),

[0136] the first passage and the second passage are respectively communicated with different annular oil passages among the plurality of annular oil passages.

[0137] According to the structure in the above (6), the first passage communicating with the first space and the second passage communicating with the second space are respectively communicated with different annular oil passages, so lubricating oil with different pressure levels can be supplied to the first space and the second space. Thus, lubricating oil can be more appropriately supplied to each of the first space and the second space.

[0138] (7) In several embodiments, based on any of the structures in the above (1) to (6),

[0139] The plurality of annular oil passages are at least partially formed by circumferential grooves provided on at least one of the outer peripheral surface of the annular rotating portion and the inner peripheral surface of the annular stationary portion.

[0140] According to the structure of the above (7), the plurality of annular oil passages are at least partially formed by circumferential grooves provided on at least one of the outer peripheral surface of the annular rotating portion of the rotor joint and the inner peripheral surface of the annular stationary portion. Therefore, the lubricating oil supplied to the main shaft via the annular stationary portion can be appropriately supplied to the engaging recess of the concave coupling portion that rotates together with the annular rotating portion via the annular oil passages.

[0141] (8) In several embodiments, based on any of the structures in the above (1) to (7),

[0142] The annular stationary portion includes a plurality of oil supply ports for respectively supplying oil to the plurality of annular oil passages.

[0143] According to the structure of the above (8), the lubricating oil supplied to the main shaft via the oil supply ports provided in the annular stationary portion of the rotor joint can be appropriately supplied to the engaging recess of the concave coupling portion that rotates together with the annular rotating portion via the annular oil passages provided in the rotor joint.

[0144] (9) In several embodiments, based on any of the structures in the above (1) to (8),

[0145] The plurality of annular oil passages are arranged offset from each other in the axial direction.

[0146] According to the structure of the above (9), the plurality of annular oil passages are arranged offset from each other in the axial direction. Therefore, the lubricating oil from different supply sources can be appropriately supplied to the engaging recess of the concave coupling portion via the plurality of annular oil passages respectively.

[0147] (10) In several embodiments, based on any of the structures in the above (1) to (9),

[0148] The concave coupling portion includes a plurality of axial oil passages that connect any one of the plurality of oil supply passages to any one of the plurality of annular oil passages,

[0149] The plurality of axial oil passages are arranged offset from each other in the circumferential direction.

[0150] According to the structure of the above (10), the plurality of axial oil passages are arranged offset from each other in the circumferential direction. Therefore, the machining for connecting the plurality of axial oil passages to the plurality of annular oil passages respectively is relatively easy.

[0151] (11) In several embodiments, based on any of the structures in the above (1) to (10),

[0152] The main shaft is provided with a sealing portion disposed between a pair of annular oil passages among the plurality of annular oil passages and for reducing leakage of lubricating oil between the pair of annular oil passages.

[0153] According to the structure of the above (11), a sealing portion for reducing leakage of lubricating oil between the annular oil passages is provided between the pair of annular oil passages. Therefore, it is easy to appropriately maintain the pressure level of the oil supply system corresponding to each annular oil passage. Thus, lubricating oil can be appropriately supplied to both the high-load region and the low-load region of the engaging recess of the concave coupling portion.

[0154] (12) The rolling equipment of at least one embodiment of the present invention includes:

[0155] The main shaft according to any one of the above (1) to (11); and

[0156] A plurality of oil supply lines that are connected to the main shaft and are used to supply oil to the plurality of annular oil passages respectively.

[0157] According to the structure of the above (12), the oil supply paths respectively corresponding to the adjacent regions (one is a high-load region and the other is a low-load region) among the above-mentioned 4 regions of the engaging recess of the concave coupling portion communicate with different annular oil passages, and oil from each oil supply line is supplied to these annular oil passages. That is, oil from different oil supply lines (oil supply sources) is supplied to the oil supply paths respectively corresponding to the high-load region and the low-load region. Thus, lubricating oil can be appropriately supplied to both the high-load region and the low-load region.

[0158] (13) In several embodiments, based on the structure of the above (12),

[0159] The rolling equipment is provided with a plurality of pumps respectively disposed on the plurality of oil supply lines.

[0160] According to the structure of the above (13), pumps are separately provided on the plurality of oil supply lines. Therefore, the pressure level of each oil supply line can be separately adjusted. Thus, lubricating oil can be appropriately supplied to both the high-load region and the low-load region.

[0161] (14) In several embodiments, based on the structure of the above (12) or (13),

[0162] The rolling equipment is provided with a switching valve capable of switching the connection destinations of the plurality of annular oil passages among the plurality of oil supply lines.

[0163] In a reversible rolling device configured to roll while reciprocating a material, the rotational directions of the rolling rolls and the main shaft become reverse in the forward path and the return path of the material. Further, in the forward path and the return path of the material, the high-load regions and the low-load regions in the engaging concave portions of the concave coupling portions are switched. Regarding this point, in the above-described embodiment (14), a switching valve is provided that can switch the connection destinations of a plurality of annular oil passages between a plurality of oil supply lines. Therefore, in accordance with the change in the rotational directions of the rolling rolls and the main shaft, the switching valve can be appropriately operated to switch the regions to which the oil is supplied from each oil supply line. Thus, in the reversible rolling device, lubricating oil can be appropriately supplied to both the high-load regions and the low-load regions in both the forward path and the return path of the material.

[0164] (15) In several embodiments, based on any of the structures in the above (12) to (14),

[0165] The plurality of oil supply lines are provided independently of each other.

[0166] According to the structure of the above (15), the plurality of oil supply lines are provided independently of each other. Therefore, the pressure levels of the oil supply systems corresponding to the respective annular oil passages can be appropriately maintained. Thus, lubricating oil can be appropriately supplied to both the high-load regions and the low-load regions of the engaging concave portions of the concave coupling portion.

[0167] The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and also includes modified forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

[0168] In this specification, expressions indicating relative or absolute configurations such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only represent such strict configurations but also represent states in which there are tolerances or displacements in angles and distances to such an extent that the same functions can be obtained.

[0169] For example, expressions indicating states in which things are equal such as "same", "equal", and "homogeneous" not only represent strictly equal states but also represent states in which there are tolerances or differences to such an extent that the same functions can be obtained.

[0170] Further, in this specification, expressions indicating shapes such as a quadrilateral shape and a cylindrical shape not only represent strictly geometric quadrilateral shapes, cylindrical shapes, etc., but also represent shapes including concavo-convex portions, chamfered portions, etc. within a range where the same effects can be obtained.

[0171] In addition, in this specification, expressions such as "comprising", "including", or "having" a component element are not exclusive expressions that exclude the existence of other component elements.

[0172] Explanation of Reference Numerals

[0173] 10 Rolling Equipment

[0174] 12 Rolling Roll

[0175] 14 Axle Box

[0176] 16 Axle Box

[0177] 18 Backup Roll

[0178] 20 Axle Box

[0179] 22 Axle Box

[0180] 24 Driving Device

[0181] 26 Main Shaft

[0182] 28 Coupling

[0183] 30 Drive Shaft

[0184] 31 Recess

[0185] 32 Concave Coupling Portion

[0186] 33 Engaging Recess

[0187] 34A Protrusion

[0188] 34B Protrusion

[0189] 35A Opposing Surface

[0190] 35B Opposing Surface

[0191] 36 Convex Coupling Portion

[0192] 37A Protrusion

[0193] 37B Protrusion

[0194] 38 Engaging Protrusion

[0195] 39A Surface

[0196] 39B Surface

[0197] 40A Sliding Metal

[0198] 40B Sliding Metal

[0199] 41 First Surface

[0200] 42 Pin

[0201] 43 Second side

[0202] 44(44a~44d) Axial oil passage

[0203] 46(46a~46d) Axial oil passage

[0204] 52 Hole

[0205] 60 Rotor joint

[0206] 62 Ring-shaped rotating part

[0207] 63 Outer peripheral surface

[0208] 64 Circumferential groove

[0209] 66 Radial passage

[0210] 67 Radial passage

[0211] 68 Axial passage

[0212] 69 Axial passage

[0213] 70 Circumferential groove

[0214] 72 Radial passage

[0215] 73 Radial passage

[0216] 74 Axial passage

[0217] 75 Axial passage

[0218] 76 Ring-shaped stationary part

[0219] 77 Inner peripheral surface

[0220] 80 Circumferential groove

[0221] 82 Circumferential groove

[0222] 84 Oil supply port

[0223] 86 Oil supply port

[0224] 87 Sealing part

[0225] 88 Sealing part

[0226] 89 Sealing part

[0227] 90(90a~90d) Oil supply passage

[0228] 92(92a~92d) Oil supply passage

[0229] 93 Oil supply passage

[0230] 94 (94a to 94d) First space

[0231] 96 (96a to 96d) Second space

[0232] 98 Convex part

[0233] 101 - 104 Annular oil passage

[0234] 110 (110A to 110D) Oil supply line

[0235] 112 (112A to 112D) Pump

[0236] 114 (114A, 114B) Switching valve

[0237] Regions A1 - A4

[0238] Center line Lc

[0239] O Rotation axis.

Claims

1. A main shaft for transmitting a rotational driving force to a rolling roll, wherein, the main shaft includes: a concave coupling portion having a fitting concave portion at one end side that can receive a fitting convex portion of a convex coupling portion; and a rotor joint provided at the other end side of the concave coupling portion, and including an annular rotating portion configured to rotate together with the concave coupling portion and an annular stationary portion located on the outer peripheral side of the annular rotating portion, the concave coupling portion includes a pair of protruding portions at the one end side, and the pair of protruding portions respectively have opposing surfaces that define the fitting concave portion, the concave coupling portion has a plurality of oil supply paths for supplying oil to the fitting concave portion, the rotor joint has a plurality of annular oil paths each communicating with any one of the plurality of oil supply paths, the plurality of oil supply paths include at least one oil supply path provided corresponding to each of the 4 regions obtained by dividing the fitting concave portion using a center line between the pair of opposing surfaces and a straight line orthogonal to the center line in a cross-section of the main shaft orthogonal to the axial direction, the at least one oil supply path provided corresponding to one of the 4 regions communicates with an annular oil path different from the annular oil path that the at least one oil supply path provided corresponding to a region adjacent to the same one of the 4 regions communicates with among the plurality of annular oil paths, the at least one oil supply path provided corresponding to one of the 4 regions respectively communicates with an annular oil path different from the annular oil paths that the at least one oil supply paths provided corresponding to regions not adjacent to the same one of the 4 regions communicate with.

2. The main shaft according to claim 1, wherein, the main shaft includes: a pin that extends along the straight line in the cross-section between the pair of protruding portions; and a pair of sliding metals supported at both end portions of the pin, and respectively having a first surface that can slide with the opposing surfaces of the pair of protruding portions and a second surface that can slide with the convex coupling portion.

3. The main shaft according to claim 2, wherein, the at least one oil supply path provided corresponding to each of the 4 regions includes: a first passage that communicates with a first space between the opposing surface of the protruding portion and the first surface of the sliding metal; and a second passage that communicates with a second space between the convex coupling portion and the second surface of the sliding metal.

4. The main shaft according to any one of claims 1 to 3, wherein, the plurality of annular oil paths are at least partially formed by circumferential grooves provided on at least one of the outer peripheral surface of the annular rotating portion and the inner peripheral surface of the annular stationary portion.

5. The main shaft according to any one of claims 1 to 3, wherein, the annular stationary portion includes a plurality of oil supply ports for respectively supplying oil to the plurality of annular oil paths.

6. The main shaft according to any one of claims 1 to 3, wherein, the plurality of annular oil paths are arranged offset from each other in the axial direction.

7. The main shaft according to any one of claims 1 to 3, wherein, The concave coupling portion includes a plurality of axial oil passages that connect any one of the plurality of oil supply passages to any one of the plurality of annular oil passages. The plurality of axial oil passages are arranged offset from each other in the circumferential direction.

8. The main shaft according to any one of claims 1 to 3, wherein The main shaft includes a sealing portion provided between a pair of annular oil passages among the plurality of annular oil passages and configured to reduce leakage of lubricating oil between the pair of annular oil passages.

9. A main shaft for transmitting a rotational driving force to a rolling roll, wherein The main shaft includes: A concave coupling portion having a fitting recess at one end side that can receive a fitting convex portion of a convex coupling portion; and A rotor joint provided at the other end side of the concave coupling portion and including an annular rotating portion configured to rotate together with the concave coupling portion and an annular stationary portion located on the outer peripheral side of the annular rotating portion, The concave coupling portion includes a pair of protruding portions at the one end side, and the pair of protruding portions each have an opposing surface that defines the fitting recess. The concave coupling portion has a plurality of oil supply passages for supplying oil to the fitting recess. The rotor joint has a plurality of annular oil passages each communicating with any one of the plurality of oil supply passages. The plurality of oil supply passages include at least one oil supply passage provided corresponding to each of four regions obtained by dividing the fitting recess using a center line between the pair of opposing surfaces and a straight line orthogonal to the center line in a cross section of the main shaft orthogonal to the axial direction. The at least one oil supply passage provided corresponding to one of the four regions communicates with an annular oil passage among the plurality of annular oil passages that is different from the annular oil passage with which the at least one oil supply passage provided corresponding to a region adjacent to the same one of the four regions communicates. The main shaft includes: A pin that extends along the straight line in the cross section between the pair of protruding portions; And A pair of sliding metals supported at both ends of the pin and each having a first surface that can slide with the opposing surface of the pair of protruding portions and a second surface that can slide with the convex coupling portion. The at least one oil supply passage provided corresponding to each of the four regions includes: A first passage that communicates with a first space between the opposing surface of the protruding portion and the first surface of the sliding metal; And A second passage that communicates with a second space between the convex coupling portion and the second surface of the sliding metal. The first passage and the second passage communicate with different annular oil passages among the plurality of annular oil passages respectively.

10. The main shaft according to claim 9, wherein The plurality of annular oil passages are at least partially formed by circumferential grooves provided on at least one of the outer peripheral surface of the annular rotating portion and the inner peripheral surface of the annular stationary portion.

11. The main shaft according to claim 9 or 10, wherein The annular stationary portion includes a plurality of oil supply ports for supplying oil to the plurality of annular oil passages respectively.

12. The main shaft according to claim 9 or 10, wherein The plurality of annular oil passages are arranged offset from each other in the axial direction.

13. The main shaft according to claim 9 or 10, wherein, the concave coupling portion includes a plurality of axial oil passages that connect any one of the plurality of oil supply passages to any one of the plurality of annular oil passages, the plurality of axial oil passages are arranged offset from each other in the circumferential direction.

14. The main shaft according to claim 9 or 10, wherein, the main shaft is provided with a sealing portion that is disposed between a pair of annular oil passages among the plurality of annular oil passages and is used to reduce the leakage of lubricating oil between the pair of annular oil passages.

15. A rolling equipment, wherein, the rolling equipment includes: the main shaft according to any one of claims 1 to 14; and a plurality of oil supply lines that are connected to the main shaft and are used to supply oil to the plurality of annular oil passages respectively.

16. The rolling equipment according to claim 15, wherein, the rolling equipment is provided with a plurality of pumps respectively disposed in the plurality of oil supply lines.

17. The rolling equipment according to claim 15 or 16, wherein, the plurality of oil supply lines are provided independently of each other.

18. A rolling equipment, wherein, the rolling equipment is provided with a main shaft for transmitting a rotational driving force to a rolling roll, the main shaft includes: a concave coupling portion having a fitting recess at one end side that can receive a fitting convex portion of a convex coupling portion; and a rotor joint that is disposed at the other end side of the concave coupling portion and includes an annular rotating portion configured to rotate together with the concave coupling portion and an annular stationary portion located on the outer peripheral side of the annular rotating portion, the concave coupling portion includes a pair of protruding portions at the one end side, and the pair of protruding portions respectively have opposing surfaces that define the fitting recess, the concave coupling portion has a plurality of oil supply passages for supplying oil to the fitting recess, the rotor joint has a plurality of annular oil passages each communicating with any one of the plurality of oil supply passages, the plurality of oil supply passages include at least one oil supply passage provided corresponding to each of the 4 regions obtained by dividing the fitting recess using a center line between the pair of opposing surfaces and a straight line orthogonal to the center line in a cross-section of the main shaft orthogonal to the axial direction, the at least one oil supply passage provided corresponding to one of the 4 regions communicates with an annular oil passage among the plurality of annular oil passages that is different from the annular oil passage communicated with the at least one oil supply passage provided corresponding to a region adjacent to the same one of the 4 regions, the rolling equipment includes: a plurality of oil supply lines that are connected to the main shaft and are used to supply oil to the plurality of annular oil passages respectively; a switching valve that can switch the connection destination of the plurality of annular oil passages between the plurality of oil supply lines.

19. The rolling equipment according to claim 18, wherein, the plurality of oil supply lines are provided independently of each other.

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