Locking device, rolling bearing and rotating shaft assembly

Abstract

The invention provides a locking device for a rolling bearing, the rolling bearing is provided with an inner ring, an outer ring and a rolling element located between the inner ring and the outer ring, the locking device comprises the inner ring, at least part of the inner surface of the inner ring is used for being attached to the outer surface of a rotating shaft, and at least part of the outer surface of the inner ring forms a first contact surface; at least part of the inner surface of the outer ring forms a second contact surface, and at least part of the outer surface of the outer ring is used for being in contact with the inner surface of the inner ring; and the bolt is configured to lock the inner ring and the outer ring in the axial direction, so that the first contact surface and the second contact surface are compressed, the inner ring can lock the rotating shaft, and the outer ring can lock the inner ring of the rolling bearing. The invention further provides a rolling bearing and rotating shaft assembly with the locking device. The locking device has the advantages of being convenient to install, free of damage to the rotating shaft, high in installation concentricity, large in locking force and the like.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, and relates to a locking device for a rolling bearing, and a corresponding rolling bearing and a rotating shaft assembly. Background Art

[0002] Rolling bearings are widely used industrial components, used to be installed on rotating shafts to support their rotation. Rolling bearings have an inner ring, an outer ring and rolling elements located between the inner ring and the outer surface of the rotating shaft, and the inner ring needs to be installed and locked to the outer surface of the rotating shaft and rotate with it.

[0003] In some cases, the structure and size of the rotating shaft are fixed, and it is impossible or inappropriate to process a structure specifically for installing the bearing on it. In this case, the inner ring of the bearing needs to be directly sleeved and locked on the outer periphery of the rotating shaft. In the prior art, in order to lock the inner ring on the rotating shaft, multiple radial threaded holes are set on the inner ring, and screws pointing to the rotating shaft are installed in them. After the end of the screw is tightened against the surface of the rotating shaft, the overall positioning of the bearing relative to the rotating shaft can be achieved. This locking method may damage the surface of the rotating shaft and affect the strength and reliability of the rotating shaft itself. In particular, for a rotating shaft with a smaller diameter, screwing multiple screws on it may damage its structural strength and affect the service life of the rotating shaft. Moreover, in order to ensure the concentricity of the bearing and the rotating shaft, it is necessary to control the size of the rotating shaft to meet certain precision requirements, and it is also necessary to finely adjust the screw-in depth of multiple locking screws, which obviously increases the complexity of installing the bearing. In addition, the locking force applied by such screws is limited, and sometimes it is necessary to process a shaft shoulder on the rotating shaft to assist in limiting the axial position of the bearing, which undoubtedly further increases the difficulty of bearing installation.

[0004] Therefore, in practice, there is an urgent need to provide a locking device which is easy to install, does not damage the rotating shaft, has a high locking force and is used to directly sleeve and lock the rolling bearing on the outer periphery of the rotating shaft. Summary of the invention

[0005] To at least overcome the above-mentioned problems, in a first aspect, the present invention provides a locking device for a rolling bearing, the rolling bearing having an inner ring, an outer ring and a rolling element located therebetween, the locking device comprising: an inner ring, at least a portion of an inner surface of the inner ring being used to fit the outer surface of a rotating shaft, at least a portion of an outer surface of the inner ring forming a first contact surface; an outer ring, at least a portion of an inner surface of the outer ring forming a second contact surface, at least a portion of an outer surface of the outer ring being used to contact the inner surface of the inner ring; and bolts configured to axially lock the inner ring and the outer ring so that the first contact surface and the second contact surface are pressed, and the inner ring can lock the rotating shaft, and the outer ring can lock the inner ring of the rolling bearing.

[0006] In some embodiments, the first contact surface and the second contact surface are conical surfaces that fit each other.

[0007] In some embodiments, at least a portion of the outer surface of the outer ring forms a protrusion for mating with a groove formed on the inner surface of the inner ring of the rolling bearing.

[0008] In some embodiments, the inner ring has a first flange plate with a through hole thereon; the outer ring has a second flange plate with a threaded hole thereon; wherein the bolt passes through the through hole of the first flange plate and is threadedly connected to the threaded hole of the second flange plate to achieve axial locking of the inner ring and the outer ring.

[0009] In some embodiments, the inner ring has a conical portion which axially protrudes from a side surface of the first flange and tapers, and an outer surface of the conical portion forms the first contact surface.

[0010] In some embodiments, the outer ring has a connecting portion, the outer surface of the connecting portion has a first protrusion protruding radially outward, and a first groove recessed radially inward, and the first groove is located between the first protrusion and the second flange; the inner surface of the inner ring has a second protrusion protruding radially inward, and a second groove recessed radially outward; wherein the first protrusion is suitable for extending into and engaging the second groove, and the second protrusion is suitable for extending into and engaging the first groove.

[0011] In some embodiments, the inner surface of the inner ring has an annular step surface perpendicular to the axis, the step surface connects the inner hole and the outer hole, the inner surface of the outer hole is provided with a flange extending radially inward, the flange forms the second protrusion, and the second groove is formed between the flange and the step surface.

[0012] In some embodiments, the connecting portion has at least two axially extending connecting ears, each of which is arc-shaped, and the outer surface of each connecting ear forms the first protrusion and the first groove; the flange has at least two flange segments, each of which is arc-shaped, and a notch is formed between the ends of two adjacent flange segments, each notch matches the size of a corresponding one of the connecting ears, allowing the first protrusion of the connecting ear to pass through the notch and extend into the second groove.

[0013] In some embodiments, the connecting portion has two connecting ears, and the two connecting ears are symmetrical about the axis center; the flange forms two notches, and the two notches are symmetrical about the axis center.

[0014] In some embodiments, the outer ring has an annular boss located between the connecting portion and the second flange.

[0015] In some embodiments, the inner ring is a non-continuous annular sleeve structure having a first gap; and the outer ring is a non-continuous annular sleeve structure having a second gap.

[0016] In some embodiments, the locking device includes a plurality of the bolts, which are arranged symmetrically about the axis center.

[0017] In a second aspect, the present invention provides a rolling bearing having an inner ring, an outer ring and rolling elements therebetween, and also having a locking device as described in any one of the above items.

[0018] In a third aspect, the present invention provides a rotating shaft assembly having a rotating shaft, a fixed structure and the above-mentioned rolling bearing, wherein the inner ring of the rolling bearing is locked to the rotating shaft by the locking device, and the outer ring of the rolling bearing is installed to the fixed structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram showing the assembly of the locking device according to the present invention and the inner ring of the rolling bearing;

[0020] Figure 2 yes Figure 1 Schematic diagram of partial section;

[0021] Figure 3 is a schematic diagram of the outer ring of the locking device;

[0022] Figure 4 is a schematic diagram of the inner ring of the rolling bearing cooperating with the outer ring of the locking device;

[0023] Figure 5 yes Figure 2 Plan view of the upper-middle section position;

[0024] Figure 6 yes Figure 2 Plan view of the lower-middle section.

[0025] Figure numerals: 100 rolling bearing, 101 inner ring, 200 locking device, 201 inner ring, 202 outer ring, 203 bolt, 204 first gap, 205 first flange, 206 conical portion, 207 through hole, 208 second gap, 209 second flange, 210 connecting portion, 211 threaded hole, 212 first protrusion, 213 first groove, 214 second protrusion, 215 second groove, 216 connecting ear, 217 annular boss, 218 step surface, 219 flange, 220 notch. DETAILED DESCRIPTION

[0026] In order to make the purpose, scheme and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same or corresponding reference numerals in the drawings represent the same or corresponding parts.

[0027] In order to solve the problems of the prior art such as complicated installation of rolling bearings, possible damage to the rotating shaft, low concentricity, etc., the present invention provides a novel locking device for directly sleeve-fitting and locking the rolling bearing on the rotating shaft.

[0028] Figure 1 The schematic diagram generally shows the locking device of the present invention assembled with the inner ring of the rolling bearing. Figure 2 yes Figure 1 A partially cutaway schematic diagram showing the internal structure of the locking device and the rolling bearing. The rolling bearing comprises an inner ring 101 and an outer ring (not shown) and rolling elements (not shown) therebetween. When in use, the inner ring 101 is mounted to the rotating shaft and the outer ring is mounted to the fixed structure, so that the rolling bearing 100 can support the rotating shaft to rotate relative to the fixed structure.

[0029] A locking device 200 is installed on one axial side (right side in the figure) of the rolling bearing 100, and the locking device 200 is used to install and lock the rolling bearing 100 to the central rotating shaft (not shown). Figure 2 As shown, the locking device 200 includes an inner ring 201 and an outer ring 202. In the axial direction, the outer ring 202 is located between the inner ring 201 and the rolling bearing 100. The inner ring 201 and the outer ring 202 are connected by a plurality of axially arranged bolts 203. In the description of this solution, unless otherwise specified, "inner" refers to the side closer to the axis, and "outer" refers to the side farther from the axis.

[0030] like Figure 2 As shown, the inner ring 201 is a sleeve structure with a through hole formed in the middle, and has a cylindrical inner surface for fitting with the outer surface of the rotating shaft. The inner ring 201 is not continuous in the circumferential direction, but has a first gap 204. Due to the existence of the first gap 204, the inner ring 201 can undergo a certain elastic deformation in the circumferential direction, so that the first gap 204 can be reduced until it is closed, so that the size of the through hole in the middle of the inner ring 201 has a certain degree of adjustability. When the first gap 204 is completely closed, the size of the through hole of the inner ring 201 reaches the minimum.

[0031] The inner ring 201 has a first flange 205 and a conical portion 206 extending axially inward from the first flange 205. A plurality of through holes 207 are provided on the first flange 205 for mounting bolts 203. The inner surface of the first flange 205 is cylindrical and is used to contact the outer surface of the rotating shaft; the outer surface is also cylindrical. The bottom of the conical portion 206 with the largest cross-sectional area is connected to the side surface of the first flange 205. The inner surface of the conical portion 206 is cylindrical and is used to contact the outer surface of the rotating shaft; the outer surface forms a conical surface (called "first contact surface"), which decreases in the direction toward the rolling bearing 100 and is used to contact the inner surface of the outer ring 202 which is also conical.

[0032] like Figure 2 As shown, the outer ring 202 is also a sleeve structure with a through hole formed in the middle. The outer ring 202 is also not continuous in the circumferential direction, but has a second gap 208 (such as Figure 3 As shown in FIG. 2 ). Due to the second gap 208, the outer ring 202 can also undergo a certain elastic deformation in the circumferential direction, so that the second gap 208 can be reduced until it is closed, so that the size of the through hole of the outer ring 202 is also adjustable to a certain extent. When the second gap 208 is completely closed, the size of the through hole of the outer ring 202 reaches the minimum.

[0033] Combination Figure 3 The schematic diagram of the outer ring 202 shown in FIG. 2 shows a schematic diagram of the outer ring 202, wherein the outer ring 202 has a second flange 209 and a connecting portion 210 extending axially inward from the second flange 209. The second flange 209 is provided with a plurality of threaded holes 211, which are used to align with the through holes 207 of the inner ring 201 and to be threadedly connected with the bolts 203, thereby connecting the outer ring 202 and the inner ring 201. By tightening the bolts 203, the inner ring 201 and the outer ring 202 can be pulled closer, and a locking force can be applied to the locking device 200. Figure 2 As shown, the outer surface of the outer ring 202, i.e., the outer surface of the second flange 209, is also cylindrical, preferably with the same cylindrical size and aligned with the outer surface of the first flange 205. The inner surface of the outer ring 202 includes a conical surface (referred to as the "second contact surface"), which may be composed of the inner surface of the second flange 209 and the inner surface of part of the connecting portion 210. The present invention is not limited thereto, and in other embodiments not shown, the second contact surface may be formed only by the inner surface of the second flange 209, or only by part of the inner surface of the second flange 209. The slope of the second contact surface is the same as the slope of the first contact surface on the inner ring 201, so that when the inner ring 201 moves toward the outer ring 202 under the action of the bolt 203, the second contact surface on the outer ring 202 fits with the first contact surface on the inner ring 201, and moves radially outward along the first contact surface, resulting in the expansion of the gap 208 of the outer ring 202, so that the size of the through hole of the outer ring 202 is expanded. Although the first and second contact surfaces in the embodiment here are conical surfaces, the present invention is not limited thereto, and surfaces of various possible shapes that can move radially away from each other while approaching each other axially fall within the protection scope of the present invention.

[0034] The connecting portion 210 of the outer ring 202 is used to connect with the inner ring 101 of the rolling bearing 100. Figure 2As shown, the outer surface of the connecting portion 210 has a first protrusion 212 and a first groove 213, the first protrusion 212 protrudes radially outward, the first groove 213 is recessed radially inward, and the first groove 213 is located between the first protrusion 212 and the second flange 209. At the end position of the inner surface of the inner ring 101 of the rolling bearing 100, there are corresponding second protrusions 214 and second grooves 215 (such as Figure 4 As shown in the figure, the second protrusion 214 extends radially inwards and can be inserted into and matched with the first groove 213 of the connecting portion 210, and the second groove 215 is recessed radially outwards and can be inserted into and matched with the first protrusion 212 of the connecting portion 210. By engaging the first protrusion 212, the first groove 213, the second protrusion 214, and the second groove 215 with each other, the axial position of the inner ring 201 can be limited relative to the inner ring 101, so that it cannot move closer to or away from the inner ring 101, thereby limiting the axial position of the locking device 200 relative to the rolling bearing 100.

[0035] Figure 3 FIG. 1 is a schematic diagram of an outer ring of a locking device according to a specific embodiment. Figure 3 As shown, the connection portion 210 of the outer ring 202 of the locking device includes two connection ears 216 extending axially from the side of the second flange 209. Each connection ear 216 is arc-shaped and extends at an acute angle in the circumferential direction, such as 30 degrees, 45 degrees, 60 degrees or other angles. The two connection ears 216 can be arranged symmetrically about the axis center. Preferably, as Figure 3 As shown, the two connecting ears 216 can also be arranged symmetrically about the plane where the second gap 208 is located. In addition, an annular boss 217 is also provided between the connecting ear 216 and the side of the second flange 209, and the length of the annular boss 217 can control the distance between the first groove 213 and the side of the second flange 209, thereby controlling the distance between the end face of the inner ring 101 of the rolling bearing and the second flange 209, and reserving sufficient space for the mounting bolts 203.

[0036] Figure 4 FIG. 1 shows a schematic diagram of a rolling bearing inner ring in a specific embodiment. Figure 4 As shown, on the inner side of the end of the inner ring 101, an annular step surface 218 is formed in a direction perpendicular to the axis, and the step surface 218 connects an inner hole with a smaller diameter and an outer hole with a larger diameter. On the inner surface of the outer hole, a flange 219 extending radially inward is provided, which forms the above-mentioned second protrusion 214. The inner side surface of the flange 219 is opposite to the step surface 218, forming the above-mentioned second groove 215. The outer side surface of the flange 219 can be flush with the outer side surface of the inner ring 101. The flange 219 has two flange sections, each of which is arc-shaped and extends at an obtuse angle in the circumferential direction, such as 150 degrees, 135 degrees, 120 degrees or other angles. The two flange sections can be arranged symmetrically about the axis. As shown Figure 4 As shown. An arc-shaped notch 220 is formed between the ends of two adjacent flange segments, and the length and width of the notch 220 match the size of the first protrusion 212 on the connecting ear 216. Therefore, when installing the outer ring 202 of the locking device and the inner ring 101 of the rolling bearing, first, the inner ring 101 is translated to extend the first protrusion 212 of the connecting ear 216 into the inner ring 101 through the notch 220; then, the outer ring 202 is rotated to rotate the first protrusion 212 of the connecting ear 216 to the second groove 215 between the step surface 218 and the flange 219 to match each other; at the same time, the second protrusion 214 on the inner ring 101 is rotated to the first groove 213 on the connecting ear 216 to match each other.

[0037] The above combination Figure 3 and Figure 4 The number and arrangement of the connecting ears and flanges shown are only examples. In other embodiments not shown, other numbers and arrangements may be used. For example, three connecting ears and three flanges, four connecting ears and four flanges that can cooperate with each other may be provided, etc. These connecting ears and flanges may be arranged in an axisymmetric, centrosymmetric or asymmetric manner.

[0038] Figure 5 and Figure 6 Shows Figure 2 The following is a combined description of the manner in which the locking device of the present invention is used to install and lock the rolling bearing.

[0039] When installing the bearing, the rolling bearing 100 and the locking device 200 are sleeved on the rotating shaft, and the positions of the rolling bearing 100 and the locking device 200 are adjusted so that the outer ring 202 of the locking device 200 is installed to the inner ring 101 of the rolling bearing 100, and the outer ring 202 of the locking device 200 is installed to the inner ring 201. There is no restriction on the order of the above sleeve and adjustment operations. The rolling bearing 100 and the locking device 200 can be sleeved on the rotating shaft first and then their positions can be adjusted, or the positions can be adjusted first and then the rolling bearing can be sleeved on the rotating shaft. After installation, as shown in FIG. Figure 5 As shown, the first protrusion 212 and the first groove 213 on the outer ring 202 of the locking device 200 cooperate with the second groove 215 and the second protrusion 214 on the inner ring 101 of the rolling bearing 100, thereby limiting the axial position of the locking device 200. Figure 5 As shown, the second contact surface of the outer ring 202 of the locking device 200 is in contact with the first contact surface of the inner ring 201, as shown in FIG. Figure 6 As shown, the bolt 203 passes through the through hole 209 on the first flange 205 from the outside and is threadedly connected with the threaded hole 211 on the second flange 209.

[0040] When locking the bearing, an axial tightening force is applied to the first flange 205 and the second flange 209 by rotating the bolt 203, so that the axial distance between the inner ring 201 and the outer ring 202 is gradually reduced. With the help of the shape matching between the second contact surface of the outer ring 202 and the first contact surface of the inner ring 201, the above axial tightening force will generate a radial contraction force acting on the inner ring 201 and a radial expansion force acting on the outer ring 202. On the one hand, the radial contraction force acts on the conical portion 206 of the inner ring 201, so that the through hole of the inner ring 201 shrinks, and the inner surface of the inner ring 201 will fit and press the outer surface of the rotating shaft. On the other hand, the radial expansion force acts on the outer ring 202, so that the through hole of the outer ring 202 expands, and the outer surface of the connecting portion 210 fits and presses the inner surface of the inner ring 101 matched therewith. Thus, the inner ring 101 and the outer ring 202, the outer ring 202 and the inner ring 201, and the inner ring 201 and the rotating shaft are locked separately, that is, the rolling bearing 100 is locked as a whole relative to the rotating shaft.

[0041] Using the locking device 200 of the present invention to install and lock the rolling bearing 100 to the rotating shaft has at least the following advantages:

[0042] First, it is easy to install. When installing the bearing, there is no need to pre-process the structure of the rotating shaft, there is no need to process the shaft shoulder to position the bearing, and there is no need to process the surface of the rotating shaft to a specific dimensional accuracy. This solution utilizes the concave-convex matching structure between the inner ring of the bearing and the outer ring of the locking device to achieve reliable positioning of the axial position of the bearing. Moreover, the size of the inner ring of the locking device of this solution is adjustable. By tightening the bolts, the size of the inner ring can be reduced and pressed tightly against the outer surface of the rotating shaft, thereby allowing the outer surface of the rotating shaft to have a certain dimensional deviation.

[0043] Second, it does not damage the rotating shaft. When the locking device of this solution is locked to the rotating shaft, the entire inner surface of the inner ring can be tightly attached to the outer surface of the rotating shaft, and the locking is achieved by surface contact between the two, rather than point contact locking of the locking screw solution in the prior art. It will not cause stress concentration and structural damage on the surface of the rotating shaft, so that the rotating shaft can maintain its original structural strength and reliability.

[0044] Third, the installation concentricity is high. In the prior art, when locking the rolling bearing with multiple locking screws, it is necessary to carefully operate the tightening degree of each locking screw to achieve the concentricity of the rolling bearing and the rotating shaft. It is difficult to obtain a very high concentricity, which will cause eccentricity during the rotation of the rotating shaft, causing vibration, noise and other problems. In this solution, by tightening the bolts, the size of the inner ring of the locking device shrinks as a whole, and it basically moves closer to the rotating shaft in each radial direction synchronously. The cylindrical inner surface of the inner ring itself is used for radial positioning, which makes it easy to achieve high concentricity and reduces vibration and noise problems.

[0045] Fourth, the locking force is large. Since a large axial tightening force can be applied by operating the bolt, a large locking force of the rolling bearing relative to the rotating shaft can be achieved. According to tests, it can reach more than 45kN, far exceeding the locking force level of the existing locking structure (5-10kN).

[0046] This document describes in detail exemplary implementations of the present invention with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present invention, various modifications and variations may be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention may be combined in various ways without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A locking device for a rolling bearing, the rolling bearing having an inner ring, an outer ring and a rolling element located therebetween, characterized in that: The locking device comprises: An inner ring, wherein at least a portion of an inner surface of the inner ring is used to fit the outer surface of the rotating shaft, and at least a portion of an outer surface of the inner ring forms a first contact surface; an outer ring, at least a portion of the inner surface of the outer ring forming a second contact surface, and at least a portion of the outer surface of the outer ring being used to contact the inner surface of the inner ring; The bolt is configured to lock the inner ring and the outer ring in the axial direction, so that the first contact surface and the second contact surface are compressed, and the inner ring can lock the rotating shaft, and the outer ring can lock the inner ring of the rolling bearing.

2. The locking device according to claim 1, characterized in that: The first contact surface and the second contact surface are conical surfaces that fit each other in shape.

3. The locking device according to claim 1, characterized in that: At least part of the outer surface of the outer ring forms a protrusion for matching with a groove formed on the inner surface of the inner ring of the rolling bearing.

4. The locking device according to claim 1, characterized in that: The inner ring has a first flange with a through hole; The outer ring has a second flange with a threaded hole; The bolts pass through the through holes of the first flange and are threadedly connected with the threaded holes of the second flange to achieve axial locking of the inner ring and the outer ring.

5. The locking device according to claim 4, characterized in that: The inner ring has a conical portion which axially extends from the side surface of the first flange and tapers gradually, and an outer surface of the conical portion forms the first contact surface.

6. The locking device according to claim 4, characterized in that: The outer ring has a connecting portion, the outer surface of the connecting portion has a first protrusion protruding radially outward and a first groove recessed radially inward, and the first groove is located between the first protrusion and the second flange; The inner surface of the inner ring has a second protrusion protruding radially inwardly and a second groove recessed radially outwardly; The first protrusion is adapted to extend into and engage with the second groove, and the second protrusion is adapted to extend into and engage with the first groove.

7. The locking device according to claim 6, characterized in that: The inner surface of the inner ring has an annular step surface perpendicular to the axis, the step surface connects the inner hole and the outer hole, the inner surface of the outer hole is provided with a flange extending radially inward, the flange forms the second protrusion, and the second groove is formed between the flange and the step surface.

8. The locking device according to claim 7, characterized in that: The connecting portion has at least two axially extending connecting ears, each connecting ear is arc-shaped, and the outer surface of each connecting ear forms the first protrusion and the first groove; The flange has at least two flange sections, each flange section is arc-shaped, and a notch is formed between the ends of two adjacent flange sections. Each notch matches the size of a corresponding one of the connecting ears, allowing the first protrusion of the connecting ear to pass through the notch and extend into the second groove.

9. The locking device according to claim 8, characterized in that: The connecting portion has two connecting ears, and the two connecting ears are symmetrical about the axis center; The flange forms two notches, and the two notches are symmetrical about the axis center.

10. The locking device according to any one of claims 6 to 9, characterized in that: The outer ring has an annular boss located between the connecting portion and the second flange.

11. The locking device according to claim 1, characterized in that: The inner ring is a discontinuous annular sleeve structure having a first gap; The outer ring is a discontinuous annular sleeve structure having a second gap.

12. The locking device according to claim 1, characterized in that: The invention comprises a plurality of bolts which are arranged symmetrically about the axis center.

13. A rolling bearing having an inner ring, an outer ring and a rolling element located therebetween, characterized in that: The invention also comprises a locking device as claimed in any one of claims 1 to 12.

14. A rotating shaft assembly, characterized in that: The invention comprises a rotating shaft, a fixed structure and the rolling bearing as claimed in claim 13, wherein the inner ring of the rolling bearing is locked to the rotating shaft by the locking device, and the outer ring of the rolling bearing is installed to the fixed structure.

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