Rope belt wheel assembly

Abstract

The utility model relates to a rope belt wheel assembly. The rope belt wheel assembly comprises a wheel shaft and a bearing, the bearing comprises an outer ring, an inner ring and a rolling body, the inner ring is arranged on the wheel shaft in a sleeving mode, the outer ring is arranged on the inner ring in a sleeving mode, and the rolling body is arranged between the outer ring and the inner ring; flanges are arranged on the peripheral edges of the end faces of the two sides of the outer ring respectively, the flanges extend out of the peripheral face of the outer ring in the radial direction of the outer ring, the flanges extend along the edges of the peripheral face of the outer ring and are annular, and the peripheral face of the outer ring and the flanges on the two sides form groove positions used for containing steel belts. The section of the outer peripheral face of the outer ring is in an arc shape, and the diameter of the outer peripheral face of the outer ring is gradually reduced from the middle to the two sides, so that the arc shape is a curve with convexity. According to the scheme, the positioning precision of the steel belt can be improved, friction is reduced, meanwhile, the bearing capacity of the bearing is improved, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of transmission devices, and particularly to a rope pulley assembly. Background Art

[0002] The rope pulley assembly of an elevator is an important part of the elevator system, and its design and function are crucial for the safe and stable operation of the elevator.

[0003] In the related art, a steel belt is tensioned on the rope pulley of the elevator rope pulley assembly. When the elevator goes up and down, the steel belt rotates with the rope pulley. However, when the steel belt rotates with the rope pulley, it may shift, which will cause the steel belt to rub against both ends of the rope pulley, thus damaging the steel belt. Utility Model Content

[0004] To solve or partially solve the problems existing in the related art, this application provides a rope pulley assembly, which can improve the positioning accuracy of the steel belt and reduce friction.

[0005] This application provides a rope pulley assembly, including: a wheel shaft and a bearing. The bearing includes an outer ring, an inner ring, and rolling elements. The inner ring is sleeved on the wheel shaft, the outer ring is sleeved on the inner ring, and the rolling elements are arranged between the outer ring and the inner ring;

[0006] Flanges are respectively provided on the outer peripheral edges of both end faces of the outer ring. The flanges protrude radially from the outer peripheral surface of the outer ring. The flanges extend along the edge of the outer peripheral surface of the outer ring and are annular. The outer peripheral surface of the outer ring and the two flanges form a slot for placing the steel belt;

[0007] The outer peripheral surface of the outer ring is configured to have an arc-shaped cross-section, and the diameter of the outer peripheral surface of the outer ring gradually decreases from the middle to both sides.

[0008] Further, the side surface of the flange forming the slot is inclined, so that the width of the slot gradually increases in the direction away from the center of the outer ring along the radial direction of the outer ring.

[0009] Further, the connection between the flange and the outer peripheral surface of the outer ring is provided with a chamfer, and the chamfer R is 0.4 - 0.5 mm.

[0010] Further, a seal is provided between the end of the outer ring and the end of the inner ring. A seal groove is provided on the inner peripheral surface of the outer ring and / or the outer peripheral surface of the inner ring, and the seal is located in the seal groove.

[0011] Further, the seal is a sealing ring, and the sealing ring is made of rubber material, or

[0012] The seal is a sealing ring made of metal material. The rope pulley assembly further includes a snap ring disposed in the seal groove, and the sealing ring is fixed to the seal groove through the snap ring.

[0013] Further, the bearing is a double-row angular contact ball bearing, and the two bearings are paired and installed on the wheel axle. The inner rings of the two paired bearings are respectively abutted against each other, and there is a gap between the outer rings of the two paired bearings.

[0014] Further, the thickness of the outer ring in the radial direction is greater than the thickness of the inner ring in the radial direction. The center diameter of the bearing is DWP = (D + d) × f1, where D is the outer diameter of the bearing, d is the inner diameter of the bearing, and f1 is a coefficient, and f1 < 0.5.

[0015] Further, the outer peripheral surface of the outer ring is plated with a zinc-nickel coating.

[0016] Further, the rolling elements are balls, and the diameter of the rolling elements is DW, (D - d) × f2 ≤ DW ≤ (D - d) × f3, where D is the outer diameter of the bearing, d is the inner diameter of the bearing, and f2 and f3 are coefficients, and f2, f3 < 0.5.

[0017] Further, a ball loading port for installing the rolling elements is provided between the right ends of the outer ring and the inner ring.

[0018] The technical solution provided by this application may include the following beneficial effects: By installing the steel belt in the groove formed by the outer peripheral surface of the outer ring and the flanges on both sides, the steel belt and the outer ring rotate synchronously. The outer peripheral surface of the outer ring is configured to have an arc-shaped cross-section, and the diameter of the outer peripheral surface of the outer ring gradually decreases from the middle to both sides. In this way, the outer peripheral surface of the outer ring forms an arc surface with a middle bulge. When rotating, the bulging arc surface can guide the position of the steel belt on the outer ring, so that the outer ring always has a tendency to be centered on the outer peripheral surface of the outer ring. In this way, even if the steel belt is offset, it can return to the centered position, preventing the steel belt from rubbing excessively against the flanges on both sides.

[0019] During the installation process of the steel belt, it is inevitable to generate deviations on the outer ring. When the steel belt generates deviations during installation or operation, there will be a phenomenon of stress concentration of the steel belt on the outer ring of the bearing, affecting the service life of the bearing. The bulging arc surface formed on the outer peripheral surface of the outer ring can ensure that the steel belt is centered on the outer peripheral surface of the outer ring, so that the steel belt evenly applies force to the outer ring, improving the service life of the bearing.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features, and advantages of the present application will become more apparent by describing exemplary embodiments of the present application in more detail with reference to the accompanying drawings. In the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0022] Figure 1 is a schematic structural diagram of a rope pulley assembly shown in an embodiment of the present application;

[0023] Figure 2 is a cross-sectional view of a bearing shown in an embodiment of the present application;

[0024] Figure 3 is a schematic diagram showing a steel strip applying a load to the outer peripheral surface of a bearing with different shapes in an embodiment of the present application;

[0025] Figure 4 is a partial schematic diagram of the outer ring at the end sealing groove shown in an embodiment of the present application;

[0026] Figure 5 is a cross-sectional view of a bearing and a partial enlarged view thereof at the flange shown in an embodiment of the present application.

[0027] Reference numerals:

[0028] 1 - axle, 2 - outer ring, 3 - inner ring, 4 - rolling element, 5 - flange, 6 - slot, 7 - seal, 8 - sealing groove, 9 - snap ring. Detailed embodiments

[0029] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0030] It should be understood that although the terms "first", "second", "third", etc. may be used in the present application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0032] Unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] In the related art, a steel belt is tensioned on a rope pulley of an elevator rope pulley assembly. When the elevator moves up and down, the steel belt rotates with the rope pulley. However, the steel belt may shift when rotating with the rope pulley, which may cause friction between the two ends of the steel belt and the rope pulley, thereby damaging the steel belt.

[0034] In view of the above problems, the embodiments of the present application provide a rope pulley assembly, which can improve the positioning accuracy of the steel belt and reduce friction.

[0035] The technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings.

[0036] As Figure 1 and Figure 2 shown, the embodiments of the present application provide a rope pulley assembly, including a wheel shaft 1 and a bearing. The bearing includes an outer ring 2, an inner ring 3 and rolling elements 4. The inner ring 3 is sleeved on the wheel shaft 1, the outer ring 2 is sleeved on the inner ring 3, and the rolling elements 4 are arranged between the outer ring 2 and the inner ring 3. During operation, the wheel shaft 1 is fixed, the inner ring 3 is sleeved on the wheel shaft 1 by interference fit, and the outer ring 2 can rotate relative to the inner ring 3 through the rolling elements 4.

[0037] The outer peripheral edges of the two side end faces of the outer ring 2 are respectively provided with flanges 5, which extend out of the outer peripheral face of the outer ring 2 in the radial direction of the outer ring 2, and the flanges 5 extend along the edge of the outer peripheral face of the outer ring 2 and are annular, and the outer peripheral face of the outer ring 2 and the flanges 5 on both sides form a groove 6 for placing the steel strip. In the figure, the radial direction of the outer ring 2 is the up and down direction, and the two end faces are located on the left and right sides of the outer ring 2. The left and right sides of the outer peripheral face of the outer ring 2 are respectively provided with flanges 5, and the flanges 5 extend outward from the outer peripheral face of the outer ring 2, and the side of the flange 5 away from the outer peripheral face of the outer ring 2 is flush with the end face of the outer ring 2, and the flange 5 is in a circular shape as a whole, and the outer peripheral face of the outer ring 2 and the flanges 5 on both sides form a groove 6 for placing the steel strip, and the steel strip is restricted to move in the groove 6.

[0038] The outer circumference of the outer ring 2 is constructed to have an arc-shaped cross section, and the diameter of the outer circumference of the outer ring 2 gradually decreases from the middle to both sides.

[0039] Based on the above scheme, by installing the steel belt in the groove 6 formed by the outer circumferential surface of the outer ring 2 and the flanges 5 on both sides, the steel belt and the outer ring 2 rotate synchronously, the outer circumferential surface of the outer ring 2 is constructed to have an arc-shaped cross-section, and the diameter of the outer circumferential surface of the outer ring 2 gradually decreases from the middle to both sides, so that the outer circumferential surface of the outer ring 2 forms a raised arc surface in the middle. During rotation, the raised arc surface can guide the position of the steel belt on the outer ring 2, so that the outer ring 2 always has a tendency to be centered on the outer circumferential surface of the outer ring 2, so that even if the steel belt is offset, it can be restored to the centered position to prevent excessive friction between the steel belt and the flanges 5 on both sides.

[0040] It is inevitable that the steel belt will have deviations on the outer ring 2 during installation. When the steel belt has deviations during installation or operation, stress concentration will occur on the outer ring 2 of the bearing, affecting the service life of the bearing. The raised arc surface formed on the outer peripheral surface of the outer ring 2 can ensure that the steel belt is centered on the outer peripheral surface of the outer ring 2 during operation, so that the steel belt is evenly stressed on the outer ring 2, thereby increasing the service life of the bearing.

[0041] like Figure 3 As shown in the figure, the arrows indicate the stress conditions. The left side is a rope pulley in the related technology, wherein the surface of the rope pulley for receiving the steel belt is flat. It can be seen that the stress of the steel belt borne by the flat receiving surface is not uniform, and the stress increases from the middle to both sides, which is prone to stress concentration; the right side is an outer ring 2 with an arc-shaped outer circumference provided in an embodiment of the present application. It can be seen that the force on the steel belt is more uniform, and stress concentration is not easy to occur.

[0042] In some embodiments, Figure 1 and Figure 5 As shown, the side surface of the flange 5 forming the groove 6 is inclined so that the width of the groove 6 gradually increases in the radial direction of the outer ring 2 away from the center of the outer ring 2 .

[0043] Specifically, the side wall of the slot 6 is inclined, which can reduce the contact area between the steel strip and the side wall of the slot 6. Thus, when the steel strip is deflected and contacts the side wall of the slot 6, the wear between the steel strip and the side wall of the slot 6 can be reduced. Optionally, the inclination angle of the slot 6 relative to the vertical direction in the figure is 0-15°.

[0044] In some embodiments, such as Figure 2 As shown, the connection between the flange 5 and the outer peripheral surface of the outer ring 2 is provided with a chamfered corner, and the chamfered corner R is 0.4-0.5 mm. By setting the chamfered corner, the wear between the steel strip and the flange 5 can be further reduced.

[0045] In some embodiments, a seal 7 is provided between the end of the outer ring 2 and the end of the inner ring 3, and a seal groove 8 is provided on the inner peripheral surface of the outer ring 2 and / or the outer peripheral surface of the inner ring 3, and the seal 7 is located in the seal groove 8.

[0046] Specifically, the seal 7 can be fixedly arranged on the outer ring 2 or the inner ring 3. When the seal 7 is fixed on the outer ring 2, it rotates relative to the inner ring 3 along with the outer ring 2. At this time, the inner peripheral surface of the outer ring 2 is provided with a seal groove 8 for fixing the seal 7. When the seal 7 is fixed on the inner ring 3, it does not move. At this time, the outer peripheral surface of the inner ring 3 is provided with a seal groove 8 for fixing the seal 7. Both the outer ring 2 and the inner ring 3 can be provided with seal grooves 8, and the seal 7 is fixedly connected to the seal groove 8 on one of them and is in clearance fit with the seal groove 8 on the other so as to be relatively rotatable.

[0047] In some embodiments, the seal 7 is a sealing ring, and the sealing ring is made of rubber material. In other embodiments, the seal 7 is a sealing ring made of metal material. The rope pulley assembly further includes a snap ring 9 arranged in the seal groove 8, and the sealing ring is fixed in the seal groove 8 through the snap ring 9.

[0048] Specifically, as Figure 4 As shown, in this embodiment, the seal 7 is a sealing ring, and the seal 7 is fixed in the seal groove 8 on the outer ring 2 through the snap ring 9. The inner peripheral edge of the seal 7 can be located in the seal groove 8 on the outer peripheral surface of the inner ring 3 and is in clearance fit with it to seal the bearing. Seals 7 are provided on both sides of the bearing to achieve double-sided sealing of the bearing.

[0049] The snap ring 9 can be of a C-shaped structure, effectively ensuring the repeatable disassembly and assembly of the bearing sealing structure, allowing lubricating oil to smoothly enter the bearing interior for lubrication, and reducing the friction and heat loss of the bearing.

[0050] In some embodiments, such as Figure 1As shown, the bearing is a double-row angular contact ball bearing, and two bearings are paired and installed on the axle 1. The inner rings 3 of the two paired bearings are respectively in contact with each other, and there is a gap between the outer rings 2 of the two paired bearings. Among them, the gap between the two outer rings 2 is not less than 1 mm to prevent contact, and even frictional collision, between the outer rings 2 during operation. The two bearings can be installed on the axle 1 in a back-to-back manner, and the width of the inner ring 3 is greater than the width of the outer ring 2.

[0051] In some embodiments, as Figure 2 shown, the radial thickness of the outer ring 2 is greater than the radial thickness of the inner ring 3. The center diameter of the bearing is DWP = (D + d) × f1, where D is the outer diameter of the bearing, d is the inner diameter of the bearing, and f1 < 0.5. The thickness of the outer ring 2 is greater than the thickness of the inner ring 3. The steel strip contacts the outer ring 2, and the steel strip applies a load to the outer ring 2, increasing the wall thickness of the outer ring 2, effectively increasing the rigidity of the outer ring 2, and reducing the risk of fracture of the bearing outer ring 2.

[0052] In some embodiments, the outer peripheral surface of the outer ring 2 is plated with a zinc-nickel coating. By plating the zinc-nickel coating on the outer peripheral surface, the corrosion resistance of the bearing outer ring 2 can be improved.

[0053] In some embodiments, the rolling element 4 is a ball, and the diameter of the rolling element 4 is DW = (D - d) × f2, where D is the outer diameter of the bearing, d is the inner diameter of the bearing, and f2 < 0.5. The ball can be selected with a large ball diameter. By simply changing the ball diameter, the load-carrying capacity of the bearing can be appropriately improved.

[0054] Furthermore, the bearing can be a multi-ball structure (filling angle greater than 180°), or even a full-ball structure. Increasing the number of balls can improve the load-carrying capacity of the bearing and meet the customer's load requirements to the greatest extent.

[0055] In some embodiments, the outer diameter D of the bearing is 30 - 50 mm, and the radial runout of the bearing is less than 0.02 mm, thereby improving the rotational accuracy of the bearing, reducing the working noise of the bearing, and further enhancing the comfort of the customer during elevator use.

[0056] In some embodiments, the materials of the outer ring 2 and the inner ring 3 are selected as bearing steel, and the heat treatment adopts a carbonitriding process to further improve the rigidity of the bearing.

[0057] In some embodiments, as Figure 2 shown, a ball loading port is provided between the right ends of the outer ring 2 and the inner ring 3. Specifically, the right end of the inner peripheral surface of the outer ring 2 is inclined, and the right end of the outer peripheral surface of the inner ring 3 is also inclined. The right end of the inner peripheral surface of the outer ring 2 and the right end of the outer peripheral surface of the inner ring 3 form a ball loading port with a taper, and the width of the ball loading port gradually increases to the right. By providing a ball loading port between the inner and outer rings of the bearing, as many balls as possible, or even full balls, can be loaded, thereby improving the load-carrying capacity of the bearing.

[0058] The solutions of the present application have been described in detail with reference to the accompanying drawings above. In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily essential to the present application. Additionally, it can be understood that the steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs, and the modules in the device embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0059] The various embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. A rope pulley assembly, characterized in that: It comprises: a wheel axle and a bearing, wherein the bearing comprises an outer ring, an inner ring and a rolling body, wherein the inner ring is sleeved on the wheel axle, the outer ring is sleeved on the inner ring, and the rolling body is arranged between the outer ring and the inner ring; The outer peripheral edges of the two side end surfaces of the outer ring are respectively provided with flanges, the flanges extend out of the outer peripheral surface of the outer ring in the radial direction of the outer ring, the flanges extend along the edge of the outer peripheral surface of the outer ring and are annular, and the outer peripheral surface of the outer ring and the flanges on both sides form grooves for placing the steel strip; The outer peripheral surface of the outer ring is constructed to have an arc-shaped cross section, and the diameter of the outer peripheral surface of the outer ring gradually decreases from the middle to both sides.

2. The rope pulley assembly according to claim 1, characterized in that: The side surface of the flange forming the groove is inclined so that the width of the groove gradually increases in the direction away from the center of the outer ring along the radial direction of the outer ring.

3. The rope pulley assembly according to claim 1, characterized in that: The connection between the flange and the outer peripheral surface of the outer ring is rounded, and the rounded corner R is 0.4-0.5mm.

4. The rope pulley assembly according to claim 1, characterized in that: A sealing member is provided between the end of the outer ring and the end of the inner ring, and a sealing groove is provided on the inner circumference of the outer ring and / or the outer circumference of the inner ring, and the sealing member is located in the sealing groove.

5. The rope pulley assembly according to claim 4, characterized in that: The sealing member is a sealing ring, and the sealing ring is made of rubber material, or The sealing member is a sealing ring made of metal material, and the rope pulley assembly also includes a clamping ring arranged in the sealing groove, and the sealing ring is fixed to the sealing groove through the clamping ring.

6. The rope pulley assembly according to claim 1, characterized in that: The bearing is a double-row angular contact ball bearing, and two of the bearings are mounted on the wheel axle in a paired manner, the inner rings of the two paired bearings are respectively in contact with each other, and there is a gap between the outer rings of the two paired bearings.

7. The rope pulley assembly according to claim 1, characterized in that: The radial thickness of the outer ring is greater than the radial thickness of the inner ring, and the center diameter of the bearing is DWP=(D+d)×f1, wherein D is the outer diameter of the bearing, d is the inner diameter of the bearing, f1 is a coefficient, and f1<0.

5.

8. The rope pulley assembly according to claim 1, characterized in that: The outer peripheral surface of the outer ring is plated with a zinc-nickel coating.

9. The rope pulley assembly according to claim 1, characterized in that: The rolling body is a ball, and the diameter of the rolling body is DW, (Dd)×f2≤DW≤(Dd)×f3, wherein D is the outer diameter of the bearing, d is the inner diameter of the bearing, f2 and f3 are coefficients, and f2 and f3 are <0.

5.

10. The rope pulley assembly according to claim 1, characterized in that: A ball loading port for mounting the rolling body is provided between the right end of the outer ring and the right end of the inner ring.

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