Thrust pad bearing limiting structure

Abstract

According to the thrust pad bearing limiting structure, a thrust pad is matched with a limiting groove in a bearing plate through a limiting part, large radial displacement of the thrust pad is avoided, a screw is arranged in a limiting through hole transversely formed in the bearing plate in a penetrating mode and is in threaded connection with the limiting part, and axial limiting of the thrust pad is achieved. The thrust pad is prevented from being lifted together due to adhesive force in the process that the thrust disc is lifted along with the rotating shaft, so that the maintenance and overhaul safety is ensured, and the structure is simple and easy to implement; the screw is blocked by the inner wall of the bearing body and cannot fall off even if the screw is loosened, and the distance between the head of the screw and the inner wall of the bearing body is smaller than the threaded connection length of the screw and the threaded hole, so that the screw is always in threaded connection with the limiting part even if the screw is loosened, and axial limiting of the thrust pad achieved through connection of the screw and the bearing plate is always effective. In addition, a gap is reserved between the rod part of the screw and the hole wall of the limiting through hole, so that the normal function of the thrust pad bearing cannot be influenced by the existence of the screw.

Description

Technical Field

[0001] This utility model belongs to the technical field of axial load in mechanical engineering, and specifically relates to a thrust bearing limiting structure. Background Technology

[0002] Thrust bearings are specifically designed to withstand axial loads. Their main function is to limit the axial displacement of a shaft, ensuring it maintains a stable position during operation. They are mainly classified into the following types: thrust ball bearings, thrust cylindrical roller bearings, thrust tapered roller bearings, thrust needle roller bearings, and thrust pad bearings. Thrust pad bearings primarily consist of a bearing housing, a bearing plate, a thrust pad, and a thrust disc. The bearing plate is coaxially mounted within the cylindrical bearing housing. The thrust pad is located on one axial side of the bearing plate, with the side of the thrust pad away from the bearing plate serving as its working surface. The thrust disc is located on the side of the thrust pad away from the bearing plate, with the side of the thrust disc facing the thrust pad serving as its thrust surface. The thrust disc is either interference-fitted or over-fitted with the shaft of the mechanical equipment. Thrust pad bearings can withstand very large axial forces and are therefore widely used in large machinery and high-precision equipment, such as steam turbines, water turbines, and generators. When a thrust bearing rotates with the shaft of a machine, lubricating oil forms an oil film between the thrust surface and the working surface to bear the axial load from the shaft. After the machine stops, the thrust surface and the working surface will stick together due to the adsorption of residual lubricating oil. Taking a vertically installed thrust bearing as an example, during the disassembly and maintenance of a machine, when the thrust disc is lifted along with the shaft, the thrust pads are prone to damage because most thrust bearings currently have axially removable thrust pads placed on a bearing plate. The thrust bearing is lifted along with the thrust plate due to adhesion force, but the adhesion force is uncontrollable. After the thrust surface and working surface are separated from the bearing body, the adhesion force is easily reduced due to the loss of residual lubricant. When the adhesion force is less than the weight of the thrust bearing, the thrust bearing may fall, which will not only damage the thrust bearing and the thrust bearing bearing itself, but also easily cause safety accidents. Similarly, when the thrust bearing is set horizontally, it is also easy for the thrust bearing to be axially displaced or fall off due to adhesion to the thrust plate during maintenance and repair.

[0003] To avoid this situation, improvements to the thrust bearing are needed, such as the anti-slip thrust sliding bearing device disclosed in Chinese Patent CN104454965A, as shown in the appendix of that application. Figure 1 As shown, this solution involves installing a support and an anti-lifting block between the thrust bearing pad and the bearing plate. The support is bolted to the thrust bearing pad, and the anti-lifting block is connected to the bearing plate. The anti-lifting block and the support have vertical contact to prevent the thrust bearing pad from detaching upwards from the bearing plate. However, this solution is not only structurally complex, but also indirectly transmits axial loads between the thrust bearing pad and the bearing plate through a relatively small support, which significantly affects the reliability of the thrust bearing pad. Another example is a thrust bearing pad anti-detachment structure disclosed in Chinese Patent CN213711613U, as shown in the appendix of that application. Figure 3As shown, the scheme is directly connected with the bearing body and the thrust pad by the axially arranged screw to prevent the thrust pad from separating from the bearing plate upwardly, but in the scheme, the screw head is exposed on the end face of the bearing body, the screw is easy to loosen and fall off, and the reliability is poor. Therefore, a simple and reliable thrust pad bearing limiting structure is needed to axially limit the thrust pad, so that the thrust pad overcomes the adhesion force in the disassembly process, avoids being lifted with the thrust disc, and thus ensures the safety of maintenance and repair. SUMMARY

[0004] In view of the above problems of the prior art, the purpose of the present application is to provide a thrust pad bearing limiting structure to solve the technical problems of complex thrust pad bearing limiting structure and poor reliability, and to achieve the effects of reducing the difficulty of maintenance and repair and improving safety.

[0005] To solve the above technical problems, the present application adopts the following technical scheme:

[0006] A thrust pad bearing limiting structure, comprising a cylindrical bearing body, an annular bearing plate is fixedly arranged coaxially in the bearing body, a thrust pad is arranged on one side of the bearing plate in the axial direction, a limiting portion is protruded on the side of the thrust pad facing the bearing plate, the bearing plate has a limiting groove matched with the limiting portion, and the limiting portion is located in the limiting groove; the outer circular surface of the bearing plate has a limiting through hole communicated with the limiting groove, a threaded hole opposite to the limiting through hole is arranged on the limiting portion, a screw is arranged in the limiting through hole and screwed with the threaded hole, the head of the screw is spaced from the inner wall of the bearing body, and the spacing is smaller than the length of the screw screwed with the threaded hole.

[0007] Further, the limiting portion and the limiting groove are gap-fitted, and an elastic supporting piece is arranged between the thrust pad and the bearing plate in abutment; the diameter of the limiting through hole is greater than the diameter of the rod portion of the screw and smaller than the diameter of the head of the screw.

[0008] Further, the thrust pad and the limiting portion are both cylindrical, the diameter of the limiting portion is smaller than the diameter of the thrust pad, and the elastic supporting piece is a bearing disc spring and is sleeved on the outside of the limiting portion.

[0009] Further, the axial direction of the limiting through hole corresponds to the radial direction of the bearing plate.

[0010] Further, a counterbore is arranged on the outer circular surface of the bearing plate at the limiting through hole, the head of the screw is located in the counterbore, and the outer circular surface of the bearing plate and the inner wall of the bearing body are spaced.

[0011] Further, a thrust disc is arranged on the side of the thrust pad away from the bearing plate, so as to be fixedly connected with the rotating shaft; a bottom plate and a cover plate are respectively detachably connected at both ends of the bearing body, so as to facilitate maintenance and repair, the bottom plate and the cover plate are annular, so as to be penetrated by the rotating shaft, the thrust disc, the thrust pad and the bearing plate are located between the bottom plate and the top plate, and the bearing plate is fixedly connected with the bottom plate.

[0012] Compared with the prior art, the push pad bearing limiting structure has the following beneficial effects:

[0013] 1、The push pad bearing limiting structure, wherein the push pad is radially limited by the cooperation of the limiting portion and the limiting groove, so that the push pad is prevented from being greatly radially displaced during operation; the limiting through hole and the threaded hole are arranged on the bearing plate and the limiting portion respectively, the screw is arranged in the limiting through hole and is threadedly connected with the threaded hole, the push pad is connected with the bearing plate by the screw to realize axial limiting, so that the push pad is prevented from being lifted together with the thrust disc due to adhesion during the process that the thrust disc is lifted with the rotating shaft during maintenance and overhaul, and the maintenance and overhaul safety is ensured.

[0014] 2、The push pad bearing limiting structure, wherein the limiting through hole is located on the outer circular surface of the bearing plate, and the head of the screw faces the inner wall of the bearing body; when the screw is loosened due to vibration generated by the operation of the mechanical equipment, the screw will move outward, but the head will be blocked by the inner wall of the bearing body, so that the screw will not fall off; and since the distance between the head of the screw and the inner wall of the bearing body is smaller than the length of the threaded connection between the screw and the threaded hole, the screw is always threadedly connected with the threaded hole of the limiting portion within the range in which the screw can move outward, so that the axial limiting of the push pad to the bearing plate by the screw is always effective, that is, the bearing body has a mechanical loosening effect on the screw, the screw does not need to be reinforced by glue and the like, and good reliability is achieved.

[0015] 3、The push pad bearing limiting structure, wherein the push pad is cooperated with the limiting hole gap prearranged on the bearing plate by the limiting portion, so that the push pad can be appropriately transversely displaced on the bearing plate and is prevented from being excessively displaced; the diameter of the limiting through hole is greater than the diameter of the screw rod, so that there is a certain gap between the screw rod and the hole wall of the limiting through hole, so that the push pad can be axially floated by cooperating with the elastic supporting member; the push pad which can be transversely displaced and axially floated can slightly swing when the stress is uneven, so as to automatically adjust the position to adapt to the load change, so that the existence of the screw will not affect the normal function of the push pad bearing. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the push pad bearing and the rotating shaft assembly connection for the embodiment;

[0017] Figure 2 It is Figure 1 an enlarged schematic view of position A in the middle;

[0018] Figure 3 It is Figure 2 an enlarged schematic view of position B in the middle;

[0019] The bearing body 1, the bearing plate 2, the thrust pad 3, the limiting part 4, the limiting groove 5, the limiting through hole 6, the screw 7, the thrust disc 8, the thrust head 9, the rotating shaft 10, the bottom plate 11, the cover plate 12, the counterbore 13 and the bearing disc spring 14. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model.

[0021] Embodiment

[0022] Please refer to Figure 1 , Figure 2 and Figure 3 , a thrust pad bearing limiting structure, comprising a cylindrical bearing body 1, an annular bearing plate 2 is coaxially fixed in the bearing body 1, a thrust pad 3 is arranged on the axial side of the bearing plate 2, a limiting part 4 is formed on the side of the thrust pad 3 facing the bearing plate 2, the bearing plate 2 is provided with a limiting groove 5 matched with the limiting part 4, and the limiting part 4 is located in the limiting groove 5; the outer circular surface of the bearing plate 2 is provided with a limiting through hole 6 communicating with the limiting groove 5, a threaded hole opposite to the limiting through hole 6 is formed on the limiting part 4, a screw 7 is arranged in the limiting through hole 6 and is screwed with the threaded hole, the head of the screw 7 is spaced apart from the inner wall of the bearing body 1, and the spacing is smaller than the length of the screw 7 screwed with the threaded hole.

[0023] In the embodiment, the side of the thrust pad 3 away from the bearing plate 2 is provided with a thrust disc 8, the thrust disc 8 extends away from the thrust pad 3 in the axial direction to form a thrust head 9, and the thrust head 9 is used for fixedly connecting a rotating shaft 10; the two ends of the bearing body 1 are respectively detachably connected with a bottom plate 11 and a cover plate 12, so that maintenance and repair can be carried out, the bottom plate 11 and the cover plate 12 are annular, the rotating shaft 10 passes through the bottom plate 11 and the cover plate 12, the thrust disc 8, the thrust pad 3 and the bearing plate 2 are located between the bottom plate 11 and the cover plate 12, and the bearing plate 2 is fixedly connected with the bottom plate 11; a counterbore 13 is formed on the outer circular surface of the bearing plate 2 at the limiting through hole 6, and the head of the screw 7 is located in the counterbore 13, so that the outer circular surface of the bearing plate 2 is recessed and spaced apart from the inner wall of the bearing body 1.

[0024] The utility model discloses thrust pad bearing limiting structure, thrust pad 3 realizes radial limit through the cooperation of limiting portion 4 and limiting groove 5 to avoid the larger radial displacement of thrust pad 3 in the operation process, limiting through -hole 6 and threaded hole are set up on the bearing plate 2 and limiting portion 4 respectively, the screw 7 is threaded in limiting through -hole 6, and the screw 7 is connected with threaded hole screw thread, make thrust pad 3 be connected with bearing plate 2 through the screw 7 and realize axial limit, prevent in the maintenance and overhaul of shutdown dismantling, thrust pad 3 is hoisted with thrust disc 8 along with thrust disc 8 along with being hoisted due to adhesion in the process of rotating shaft 10, thereby guaranteeing maintenance overhaul safety, the overall structure is simple, easy to realize, in addition, limiting through -hole 6 is located on the outer circular surface of bearing plate 2, and the head of screw 7 faces the inner wall of bearing body 1, when the screw 7 is loosened due to the vibration of mechanical equipment operation, although the screw 7 will move outward, but the head will be blocked by the inner wall of bearing body 1, so the situation of falling off will not appear, and because the distance between the head of screw 7 and the inner wall of bearing body 1 is less than the length of screw 7 and threaded hole screw thread connection, so within the range of outward movement of screw 7, the screw 7 always keeps screw thread connection with the threaded hole of limiting portion 4, so that the axial limit of thrust pad 3 connected with bearing plate 2 through the screw 7 is always effective, that is, bearing body 1 plays the mechanical relaxation effect to screw 7, and the screw 7 does not need to be reinforced by glue and the like, and has good reliability, therefore, the utility model can effectively solve the problems of complex thrust pad bearing limiting structure and poor reliability, and is favorable for reducing the difficulty of maintenance and overhaul and improving safety.

[0025] In the existing thrust pad bearing, the thrust pad is generally prevented from excessive displacement in the transverse direction by the pre-set baffle on the bearing plate, and an elastic support member is arranged between the thrust pad and the bearing plate, so that the thrust pad can slightly swing when the stress is uneven, thereby automatically adjusting the position to adapt to the load change. Figure 2 Figure 3 In the embodiment, the limiting portion 4 is gap-fitted with the limiting groove 5, and the elastic support member is arranged in abutment between the thrust pad 3 and the bearing plate 2.

[0026] ​Thus, the thrust pad 3 is matched with the clearance between the limiting portion 4 and the limiting hole of the bearing plate 2, so that the thrust pad 3 can be appropriately displaced in the lateral direction on the bearing plate 2 and prevented from being excessively displaced. The diameter of the limiting through hole 6 is greater than the diameter of the rod portion of the screw 7, so that there is a gap between the rod portion of the screw 7 and the hole wall of the limiting through hole 6, so as to cooperate with the elastic supporting member to make the thrust pad 3 axially float. The thrust pad 3 which can be laterally displaced and axially floated can slightly swing when the force is uneven, so as to automatically adjust the position to adapt to the load change. That is, by setting the diameter of the limiting through hole 6 greater than the diameter of the rod portion of the screw 7, the gap between the rod portion of the screw 7 and the hole wall of the limiting through hole 6 is left, so that the existence of the screw 7 does not affect the normal function of the thrust pad 3 bearing. In addition, in the prior art, the screw is axially arranged to connect the thrust pad and limit the axial movement of the thrust pad, and the screw can interfere with the elastic supporting member, so that the radial size of the thrust pad needs to be correspondingly enlarged or the radial size of the elastic supporting member needs to be correspondingly reduced, which can affect the performance and stability of the thrust pad bearing. The thrust pad bearing limiting structure can well avoid this problem, so that the thrust pad bearing limiting structure has good practicability.

[0027] In the embodiment, the axial direction of the limiting through hole 6 corresponds to the radial direction of the bearing plate 2. Thus, the screw 7 is perpendicular to the axial floating direction of the thrust pad 3, so that the possibility of the radial movement of the screw 7 due to the floating of the thrust pad 3 can be effectively reduced, the head of the screw 7 can be prevented from colliding with the bearing body 1 to cause damage and noise, and the reliability and practicability of the thrust pad bearing limiting structure can be improved.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the technical solutions. Those skilled in the art should understand that the technical solutions of the present application can be modified or replaced, without departing from the spirit and scope of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A thrust bearing limiting structure, comprising a cylindrical bearing body, an annular bearing plate coaxially fixed within the bearing body, and a thrust bearing on one axial side of the bearing plate, characterized in that: The thrust bearing protrudes to one side of the bearing plate to form a limiting part. The bearing plate has a limiting groove that matches the limiting part, and the limiting part is located in the limiting groove. The outer circular surface of the bearing plate has a limiting through hole that communicates with the limiting groove. The limiting part has a threaded hole that is directly opposite the limiting through hole. A screw that is threaded into the threaded hole passes through the limiting through hole. There is a gap between the screw head and the inner wall of the bearing body, and the gap is less than the length of the threaded connection between the screw and the threaded hole. A countersunk hole is formed on the outer circular surface of the bearing plate at the limiting through hole. The screw head is located in the countersunk hole so as to be recessed into the outer circular surface of the bearing plate and spaced from the inner wall of the bearing body.

2. The thrust bearing limiting structure according to claim 1, characterized in that: The limiting part and the limiting groove are fitted with a clearance, and an elastic support is provided between the thrust pad and the bearing plate; the diameter of the limiting through hole is larger than the diameter of the screw shank and smaller than the diameter of the screw head.

3. The thrust bearing limiting structure according to claim 2, characterized in that: Both the thrust bearing and the limiting part are cylindrical, with the diameter of the limiting part being smaller than that of the thrust bearing. The elastic support is a bearing disc spring that is sleeved outside the limiting part.

4. The thrust bearing limiting structure according to claim 1, characterized in that: The axial direction of the limiting through hole corresponds to the radial direction of the bearing plate.

5. The thrust bearing limiting structure according to claim 1, characterized in that: A thrust plate is provided on the side of the thrust bearing away from the bearing plate for fixing the shaft; the bearing body is detachably connected to a base plate and a cover plate at both ends for maintenance and repair. The base plate and cover plate are annular to allow the shaft to pass through. The thrust plate, thrust bearing, and bearing plate are located between the base plate and the top plate, and the bearing plate is fixedly connected to the base plate.

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