Pulley block bearing and dustproof cover of pulley block bearing

Abstract

The utility model relates to a bearing part, in particular to a pulley block bearing and a dustproof cover of the pulley block bearing, which comprises a steel framework with an L-shaped section and sealing rubber connected to one end of the L-shaped steel framework, and the sealing rubber is connected with the vertical end of the L-shaped steel framework in a wrapping manner; the outer diameter of the sealing rubber is provided with an embedded groove, and the inner diameter of the sealing rubber is of a multi-step surface structure with unequal diameters; the dustproof cover is simple in structural design, the dustproof effect can be achieved, and interference between the dustproof covers after a set of pulley bearings are installed is avoided; foreign matters are prevented from entering the bearing, and meanwhile, the rotation flexibility of the bearing is ensured; according to the structure, under the condition that sealing is met, less sealing rubber is used, and the cost of the dustproof cover is reduced.

Description

Technical Field

[0001] The utility model relates to a bearing part, in particular to a dust cover for a pulley group bearing, which is used for the bearing of the crown block pulley group of petroleum equipment and belongs to the technical field of rolling bearings. Background Art

[0002] The bearing of the crown block pulley group of petroleum equipment uses grease lubrication. This type of bearing structure has high requirements for the performance of the dust cover. In addition to meeting the basic dust-proof effect and preventing foreign objects from entering the bearing, it is also necessary to optimize the design form of the dust cover considering the overall layout in the bearing and the production cost to ensure the stable operation of the bearing. Summary of the Utility Model

[0003] In view of the above requirements for the performance of the dust cover of the crown block pulley group bearing of petroleum equipment to meet the bearing requirements, the purpose of the utility model is to provide a dust cover for a pulley group bearing.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: a dust cover for a pulley group bearing, including: an L-shaped steel skeleton in cross section and a sealing rubber connected to one end of the L-shaped steel skeleton, and the sealing rubber is connected to the vertical end of the L-shaped steel skeleton in a wrapping manner; an embedding groove is provided on the outer diameter of the sealing rubber, and the inner diameter is a multi-step surface structure with unequal diameters;

[0005] Further, the sealing rubber completely wraps the end part of the vertical end of the L-shaped steel skeleton through the embedding groove, so that less sealing rubber is used, and the cost of the dust cover can be reduced;

[0006] Further, the width of the embedding groove of the sealing rubber matches the thickness of the L-shaped steel skeleton;

[0007] Further, the embedding groove is a strip-shaped blind hole groove opened from the outer diameter to the inner diameter direction;

[0008] Further, the depth of the embedding groove accounts for more than one-half of the maximum distance from the outer diameter to the inner diameter of the sealing rubber;

[0009] Further, a 45° large inclined surface is provided on one side of the outer diameter of the sealing rubber close to the embedding groove.

[0010] Further, the multi-step surface with unequal diameters of the inner diameter of the sealing rubber includes three step surfaces from large to small, namely the first large inner diameter step surface, the second medium inner diameter step surface and the third small inner diameter step surface; the third small inner diameter step surface is located in the middle position, one end on the side of the third small inner diameter step surface and in the same direction as the large inclined surface of the sealing rubber is the first large inner diameter step surface, and the other side of the third small inner diameter step surface is the second medium inner diameter step surface;

[0011] Further, among the three stepped surfaces, right-angle transitions are adopted between two adjacent stepped surfaces.

[0012] The dust cover described above is applied to the pulley group bearing. It adopts a double-row tapered bearing, and its specific structure further includes: a double-raceway outer ring, two single-raceway inner rings, a double-row rolling element between the inner and outer rings, and a cage; the double-row rolling elements are all contained in the pocket holes of their respective cages, and several rolling elements are all rollingly arranged in the inner ring raceway and the outer ring raceway, and an inner spacer is arranged between the two inner rings; the number of dust covers is two and they are respectively arranged at the two end faces of the bearing; the two dust covers are symmetrically arranged with respect to the radial center line of the bearing;

[0013] Further, one end of the sealing rubber of the dust cover is fitted with the inner ring, and the end of the L-shaped steel skeleton opposite to the vertical end is connected to the outer ring;

[0014] Further, the outer end face of the inner ring is higher than the outer end face of the outer ring, and there is a certain height difference between the outer end face of the inner ring and the outer end face of the outer ring. The L-shaped steel skeleton of the dust cover is placed on the outer diameter and the outer end face of the outer ring, and one end of the sealing rubber of the dust cover is fitted on the outer diameter of the inner ring; this design form can not only achieve the dust-proof effect, but also avoid the interference between the dust covers after a set of pulley bearings are installed, meet the requirement of preventing foreign objects from entering the bearing, and at the same time ensure the rotational flexibility of the bearing;

[0015] Further, a stepped groove is formed on the outer diameter of the outer ring at the position where the L-shaped steel skeleton is installed. A part of the L-shaped steel skeleton is in interference contact with the stepped groove, and a part is against the outer end face of the outer ring and is pressed by a tooling;

[0016] Further, the sealing rubber of the dust cover is in clearance fit with the inner ring through three stepped surfaces, which is equivalent to the function of exhausting air when injecting grease, and can better make the grease evenly distributed in the bearing cavity;

[0017] Further, according to design experience, a small clearance fit of 0.2 mm is adopted between the dust cover and the inner ring;

[0018] Further, a sealing groove for cooperating with the three stepped surfaces of the sealing rubber is arranged on the outer diameter of the inner ring. The bottom of the sealing groove and one side surface of the groove are designed to be conforming to the third smallest inner diameter stepped surface and the first largest inner diameter stepped surface of the sealing rubber respectively; the side surface of the sealing groove corresponding to the second medium inner diameter stepped surface is provided with a 45° inclined plane, and this setting method is convenient for the installation of the dust cover.

[0019] The beneficial effects of adopting the dust cover of the pulley group bearing of the present utility model are:

[0020] The dust cover of this structure has a simple design. It can not only achieve the effect of dust prevention, but also avoid the interference between dust covers after a set of pulley bearings are installed. It meets the requirements of preventing foreign objects from entering the bearing and ensuring the rotational flexibility of the bearing. Structurally, under the condition of meeting the sealing requirements, less sealing rubber is used, reducing the cost of the dust cover. Brief Description of the Drawings

[0021] Figure 1 It is a structural diagram of the dust cover of the present utility model.

[0022] Figure 2 It is an assembly drawing of the bearing of the dust cover.

[0023] Figure 3 It is a structural diagram of the sealing groove of the inner ring of the bearing.

[0024] In the figure, 1 is an L-shaped steel skeleton, 2 is a sealing rubber, 3 is an embedding groove, 2.1 is the first large inner diameter stepped surface, 2.2 is the second medium inner diameter stepped surface, 2.3 is the third small inner diameter stepped surface, 4 is the outer ring, 5 is the inner ring, 6 is the rolling element, 7 is the cage, 8 is the inner spacer, 4.1 is the stepped groove, 5.1 is the sealing groove, and 5.1.1 is the 45° inclined plane. Detailed Description of the Preferred Embodiments

[0025] In order to make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0026] Embodiment 1

[0027] As Figure 1 shown in the pulley group bearing dust cover, it includes: an L-shaped steel skeleton 1 in cross section and a sealing rubber 2 connected to one end of the L-shaped steel skeleton 1. The sealing rubber 2 is connected to the vertical end of the L-shaped steel skeleton 1 in a wrapped manner; the outer diameter of the sealing rubber 2 is provided with an embedding groove 3, and the inner diameter is a multi-stepped surface structure with unequal diameters;

[0028] The sealing rubber 2 completely wraps the end part of the vertical end of the L-shaped steel skeleton 1 through the embedding groove 3,

[0029] The width of the embedding groove 3 of the sealing rubber 2 matches the thickness of the L-shaped steel skeleton 1;

[0030] The embedding groove 3 is a strip-shaped blind hole groove opened from the outer diameter to the inner diameter direction;

[0031] The groove depth of the embedded groove 3 is more than one-half of the maximum distance from the outer diameter to the inner diameter of the sealing rubber;

[0032] On one side of the outer diameter of the sealing rubber 2 near the embedded groove 3, a 45° large inclined surface is provided.

[0033] The multi-step surfaces with unequal diameters of the inner diameter of the sealing rubber 2 include three step surfaces from large to small, namely the first large inner diameter step surface 2.1, the second medium inner diameter step surface 2.2, and the third small inner diameter step surface 2.3; the third small inner diameter step surface 2.3 is located in the middle position, one end on one side of the third small inner diameter step surface 2.3 and in the same direction as the large inclined surface of the sealing rubber 2 is the first large inner diameter step surface 2.1, and the other side of the third small inner diameter step surface 2.3 is the second medium inner diameter step surface 2.2;

[0034] Among the three step surfaces described above, right-angle transitions are used for connection between two adjacent step surfaces.

[0035] Embodiment 2

[0036] The dust cover of Embodiment 1 is applied to the pulley group bearing, and a double-row tapered bearing is used, as Figure 2 、 3 shown. Its specific structure further includes: a double-raceway outer ring 4, two single-raceway inner rings 5, double-row rolling elements 6 between the inner and outer rings, and a cage 7; the double-row rolling elements 6 are all contained in the pocket holes of their respective cages 7, and a number of rolling elements 6 are all rollingly arranged in the inner ring raceway and the outer ring raceway, and an inner spacer 8 is arranged between the two inner rings 5; the number of dust covers is two and they are respectively arranged at the two end faces of the bearing; the two dust covers are symmetrically arranged with respect to the radial center line of the bearing;

[0037] One end of the sealing rubber 2 of the dust cover is fitted with the inner ring 5, and the end of the L-shaped steel skeleton 1 opposite to the vertical end is connected to the outer ring 4;

[0038] The outer end face of the inner ring 5 is higher than the outer end face of the outer ring 4, and a certain height difference is formed between the outer end face of the inner ring 5 and the outer end face of the outer ring 4. The L-shaped steel skeleton 1 of the dust cover is placed on the outer diameter and the outer end face of the outer ring 4, and one end of the sealing rubber 2 of the dust cover is fitted on the outer diameter of the inner ring 5;

[0039] The outer diameter of the outer ring 4 at the position where the L-shaped steel skeleton 1 is installed forms a stepped groove 4.1. A part of the L-shaped steel skeleton 1 is in interference contact with the stepped groove 4.1, and a part is against the outer end face of the outer ring 4 and is pressed by a tooling;

[0040] The sealing rubber 2 of the dust cover is in clearance fit with the inner ring 5 through three step surfaces, which is equivalent to the function of exhausting air when injecting grease, and can better make the grease evenly distributed in the bearing cavity;

[0041] According to design experience, a small clearance fit of 0.2 mm is adopted for the clearance between the dust cover and the inner ring 5;

[0042] A sealing groove 5.1 is provided on the outer diameter of the inner ring 5 and is designed to fit with the three stepped surfaces of the sealing rubber 2. The bottom of the sealing groove 5.1 and one side surface of the groove are respectively designed to conform to the third smallest inner diameter stepped surface 2.3 and the first largest inner diameter stepped surface 2.1 of the sealing rubber 2; a 45° inclined plane 5.1.1 is provided on the side surface of the sealing groove 5.1 corresponding to the second medium inner diameter stepped surface 2.2. This setting method facilitates the installation of the dust cover.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, it should not be construed as a limitation to the present invention.

[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A pulley block bearing dust cover, characterized in that, Comprising: A cross-section L-shaped steel skeleton and a sealing rubber connected to one end of the L-shaped steel skeleton. The sealing rubber is connected to the vertical end of the L-shaped steel skeleton in a wrapping manner; an embedding groove is provided on the outer diameter of the sealing rubber, and the inner diameter is a multi-step surface structure with unequal diameters.

2. The dust-proof cover for a pulley bearing according to claim 1, characterized in that: The width of the embedding groove of the sealing rubber matches the thickness of the L-shaped steel skeleton.

3. The dust-proof cover for a pulley bearing according to claim 1, characterized in that: The depth of the embedding groove accounts for more than one-half of the maximum distance from the outer diameter to the inner diameter of the sealing rubber.

4. A pulley bearing dust cover according to claim 1, characterized in that: The multi-step surfaces with unequal diameters of the inner diameter of the sealing rubber include three step surfaces from large to small, namely the first large inner diameter step surface, the second medium inner diameter step surface, and the third small inner diameter step surface; the third small inner diameter step surface is located in the middle position. One end on the side of the third small inner diameter step surface and in the same direction as the large inclined surface of the sealing rubber is the first large inner diameter step surface, and the other side of the third small inner diameter step surface is the second medium inner diameter step surface.

5. The pulley set bearing of the dust cover according to any one of claims 1-4, characterized in that: It adopts a double-row tapered roller bearing, and its specific structure includes: a double-raceway outer ring, two single-raceway inner rings, a double-row rolling element between the inner and outer rings, and a cage; the double-row rolling elements are all contained in their respective cage pockets, and several rolling elements are all rollingly arranged in the inner ring raceway and the outer ring raceway. An inner spacer is arranged between the two inner rings; the number of dust covers is two and they are respectively arranged at the two end face positions of the bearing; the two dust covers are symmetrically arranged with respect to the radial center line of the bearing.

6. The pulley bearing according to claim 5, characterized in that: One end of the sealing rubber of the dust cover is matched with the inner ring, and the end of the L-shaped steel skeleton opposite to the vertical end is connected to the outer ring.

7. A pulley bearing according to claim 6, characterized in that: The outer end face of the inner ring is higher than the outer end face of the outer ring, and a certain height difference is formed between the outer end face of the inner ring and the outer end face of the outer ring. The L-shaped steel skeleton of the dust cover is placed on the outer diameter and the outer end face of the outer ring, and one end of the sealing rubber of the dust cover is then matched with the outer diameter of the inner ring.

8. A pulley bearing according to claim 6, wherein: A stepped groove is formed on the outer diameter of the position where the outer ring installs the L-shaped steel skeleton. A part of the L-shaped steel skeleton is in interference contact with the stepped groove, and a part is against the outer end face of the outer ring and is pressed by a tooling.

9. A pulley bearing according to claim 5, wherein: The sealing rubber of the dust cover is in clearance fit with the inner ring through three step surfaces.

10. A pulley bearing according to claim 5, characterized in that: Sealing grooves for cooperating with the three step surfaces of the sealing rubber are arranged on the outer diameter of the inner ring. The bottom of the sealing groove and a side surface of the groove are respectively designed to be conformable with the third small inner diameter step surface and the first large inner diameter step surface of the sealing rubber; the side surface of the sealing groove corresponding to the second medium inner diameter step surface is provided with a 45° inclined plane.

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