Novel rolling and sliding composite bearing structure

Abstract

The utility model discloses a novel rolling and sliding composite bearing structure which comprises an outer revolving body and an inner revolving body and is characterized in that supporting sliding blocks and rollers are arranged between the inner revolving body and the outer revolving body, at least two rollers are arranged between the adjacent supporting sliding blocks, the left side face and the right side face of each supporting sliding block are in contact with the rollers, and the left side face and the right side face of each supporting sliding block are in contact with the rollers. The left side face and the right side face of each pin roller make contact with the side face of the supporting sliding block or the side face of the pin roller. According to the roller bit bearing, the working condition that the roller bit bearing bears higher load is met, and the service life of the roller bit bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of roller drill bits for oil, gas and mining drilling, and more specifically, to a novel rolling and sliding composite bearing structure suitable for the rolling and sliding composite bearing used in medium and heavy loads. Background Art

[0002] Existing rolling-sliding composite bearings borrow the characteristics of sliding bearings and rolling bearings: the supporting slider and the roller are installed at an interval, that is, the supporting slider and the roller are paired in a 1:1 ratio. Due to the large contact area between the supporting slider and the outer rotating body and the inner rotating body, the frictional heat generation rate is high. Under poor lubrication and cooling conditions, the service life of the rolling-sliding composite bearing is reduced, and it is not suitable for operation at higher speeds. Utility Model Content

[0003] The utility model aims to provide a novel rolling and sliding composite bearing structure which can be suitable for operation at a relatively high speed.

[0004] The technical solution adopted by the utility model to solve this technical problem is: a new rolling-sliding composite bearing structure, including an outer rotating body and an inner rotating body, a supporting slider and a roller are arranged between the inner and outer rotating bodies, at least two rollers are arranged between adjacent supporting sliders, and at least two rollers are arranged between adjacent supporting sliders, and the matching ratio of the supporting slider and the roller is between 1:2 and 1:20. The left and right sides of each supporting slider are in contact with the roller, and the left and right sides of each roller are in contact with the side of the supporting slider or the side of the roller.

[0005] As a further solution of the utility model, three rollers are arranged between adjacent supporting slide blocks.

[0006] As a further solution of the utility model, the upper and lower side surfaces of the supporting slider are both arc-shaped, the arc radius of the upper side surface of the supporting slider is smaller than the inner diameter of the outer rotating body, and the arc radius of the lower side surface of the supporting slider is larger than the outer diameter of the inner rotating body.

[0007] As a further solution of the utility model, upper chamfers with a length greater than 2mm are provided on both sides of the arc radius of the upper side of the supporting slider, lower chamfers with a length greater than or equal to 2mm and a plane with a length greater than or equal to 2mm transitioning to the middle are provided on both sides of the arc radius of the lower side of the supporting slider.

[0008] As a further solution of the utility model, the inner rotating body is a tooth palm bearing or a floating structure at the lower part of the roller bit, and the outer rotating body is a roller bit.

[0009] As a further solution of the utility model, a titanium coating layer is arranged on the outer periphery of the supporting sliding block.

[0010] As a further solution of the utility model, a cavity is opened in the middle of the supporting sliding block, and a porous alumina ceramic body is fixed in the cavity.

[0011] As a further solution of the utility model, the outer side surface of the porous alumina ceramic body is arranged in parallel with the outer side surface of the corresponding supporting slider, and the volume of the porous alumina ceramic body is equal to or less than 1 / 2 of the volume of the supporting slider.

[0012] As a further solution of the utility model, the width between the left side and the right side of the supporting sliding block is 0.8 to 3 times the diameter of the roller.

[0013] The utility model includes at least the following beneficial effects: the new roller drill bit with a rolling-sliding composite bearing structure can be provided with supporting sliders and rollers in different proportions according to the drilling pressure and rotation speed requirements, so as to meet the working conditions of the roller bearing under higher loads and extend the service life of the roller drill bit bearing.

[0014] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a roller drill bit;

[0016] Figure 2 It is a partial cross-sectional view of a roller drill bit;

[0017] Figure 3 This is a cross-sectional view of a new type of rolling-sliding composite bearing structure, namely Figure 2 AA section view in;

[0018] Figure 4 A schematic diagram of a supporting slider in one of the embodiments;

[0019] Figure 5 It is a schematic diagram of a supporting slider in another embodiment.

[0020] In the figure: 1, a roller drill bit, 2, a tooth palm, 3, a roller, 4, a cutting tooth, 5, a steel ball, 6, a tooth palm bearing, 7, a bearing seal ring, 8, a porous alumina ceramic body, 11, an outer rotating body, 12, a supporting slider, 13, a roller, 14, an inner rotating body, 21, a right side surface of the supporting slider, 22, a plane, 23, a lower side surface of the supporting slider, 24, a lower chamfer, 25, a left side surface of the supporting slider, 26, an upper chamfer, and 27, an upper side surface of the supporting slider. DETAILED DESCRIPTION

[0021] The utility model is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the utility model, including the following description, can be combined with each other without conflict.

[0022] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] The following is a further detailed description of the utility model in conjunction with the accompanying drawings and implementations, and its specific implementation process is as follows:

[0024] The new rolling-sliding composite bearing structure in this embodiment is particularly suitable for use as a bearing for a cone drill bit 1 for oil, natural gas, and mining drilling. The cone drill bit 1 includes: at least one cone palm 2 and one cone 3. The bottom end of the cone palm 2 is provided with a cantilever shaft, and the new rolling-sliding composite bearing structure is a bearing structure in which the cone palm bearing 6 is connected to the cone 3, and the bearing structure is used to ensure that the cone 3 rotates effectively during operation.

[0025] like Figure 1 As shown, the drill bit of this embodiment is a new rolling-sliding composite bearing structure with a diameter of 311 mm (12 1 / 4"), including three tooth palms 2 and three cones 3, and a new rolling-sliding composite bearing structure is arranged between each tooth palm 2 and each cone 3.

[0026] The assembly process of the cone 3 and the tooth palm 2 is as follows: install the supporting slider 12 and the roller 13 in the cylindrical roller groove (not shown) of the cone 3, install the bearing seal 7 between the tooth palm 2 and the cone 3, install the tooth palm 2 shaft neck into the inner hole of the cone 3, and then install the steel ball 5 (5). During the use of the cone 3 drill bit 1, first connect the thread on the upper part of the drill bit with the thread on the drill rod or screw and other drilling tools, drive the cone 3 drill bit 1 with a turntable or top drive, or drive the cone 3 drill bit 1 with a downhole tool such as a screw, the cone 3 drill bit 1 rotates and moves along a predetermined route, and the cutting teeth 4 on the cone 3 continuously impact the rock, thereby breaking the rock to form the desired wellbore. Figure 1 and Figure 2 As shown, the three cones 3 of the cone drill bit 1 adopt 5-5-4 tooth rows, and a plurality of cutting teeth 4 are arranged on each tooth row.

[0027] like Figure 3As shown, the novel rolling-sliding composite bearing structure includes an outer rotating body 11 and an inner rotating body 14, wherein the outer rotating body 11 is the tooth wheel 3, and the inner rotating body 14 is the tooth palm bearing 6 or other floating structure. A total of 4 supporting sliders 12 and a total of 12 rollers 13 are installed in the annular rolling groove between the outer rotating body 11 and the inner rotating body 14, and a total of 3 rollers 13 are arranged between every two supporting sliders 12, and the matching ratio of the supporting sliders 12 to the rollers 13 is 1:3. The left and right sides of each supporting slider 12 are in contact with the rollers 13, and the left and right sides of each roller 13 are in contact with the side of the supporting slider 12 or the side of the roller 13.

[0028] The technical solution may also include the following technical details to better achieve the technical effect: the width between the left side 25 and the right side of the supporting slider is 0.8 to 3 times the diameter of the roller 13;

[0029] The difference between the arc radius of the upper side of the supporting slider and the inner diameter of the outer rotating body 11 is 0.05-0.3mm, and the difference between the arc radius of the lower side of the supporting slider 23 and the outer diameter of the inner rotating body 14 is 0.05-0.3mm. Figure 3 As shown, the diameter of the support slider 12 is 28.8 mm, and the diameter of the roller 13 is 17.2 mm. The width between the left side 25 of the support slider and the right side 21 of the inner return support slider is 1.67 times the diameter of the roller 13 in the rolling-sliding composite bearing structure. The slider width and the roller 13 diameter are set within a reasonable range to ensure the stability of the bearing operation. The width of the support slider is related to the diameter of the roller and the diameter of the inner rotating body 14. By adjusting its width, the gap between the support slider / roller and the roller / roller is reasonable. If the width of the support slider is small, the friction force of the support slider is greater than that of the roller, and deflection will occur; if it is too wide, the heat generated is large, which is also not suitable.

[0030] The technical solution may also include the following technical details to better achieve the technical effect: three rollers 13 are arranged between adjacent supporting sliders 12 .

[0031] The present technical solution may also include the following technical details to better achieve the technical effect: the upper and lower side surfaces of the supporting slider 12 are both arc-shaped, the arc radius of the upper side surface of the supporting slider is smaller than the inner diameter of the outer rotating body 11, and the arc radius of the lower side surface 23 of the supporting slider is larger than the outer diameter of the inner rotating body 14.

[0032] The technical solution may also include the following technical details to achieve better technical effects: upper chamfers 26 with a length greater than 2mm are provided on both sides of the arc radius of the upper side of the supporting slider, lower chamfers 24 with a length greater than or equal to 2mm and a plane 22 with a length greater than or equal to 2mm transitioning to the middle are provided on both sides of the arc radius of the lower side 23 of the supporting slider. Figure 4As shown, the chamfer dimensions of the upper chamfer of the upper side surface of the support slider and the lower side surface of the support slider 23 are 264mm, 242mm, and 222mm. Such a design can reduce the area of ​​the upper side surface / lower side surface and the contact surface, and reduce the heat generated during the operation of the bearing.

[0033] The technical solution may also include the following technical details to better achieve the technical effect: a titanium plating layer is provided on the periphery of the supporting slider 12 to improve the wear resistance of the supporting slider 12 .

[0034] This technical solution may also include the following technical details to better achieve the technical effect: Figure 5 As shown, a cavity is opened in the middle of the supporting slider 12, and a porous alumina ceramic body 8 is fixed in the cavity, which can quickly conduct the heat generated by the friction between the supporting slider and the inner rotating body 14 and the outer rotating body 11 to the porous alumina ceramic body 8. The porous alumina ceramic body 8 has a porous structure, which increases the contact area with the lubricating oil, accelerates the heat dissipation speed of the supporting slider as a whole, and improves the life of the rolling and sliding composite bearing.

[0035] The present technical solution may also include the following technical details to better achieve the technical effect: the outer side surface of the porous alumina ceramic body 8 is arranged parallel to the outer side surface of the corresponding supporting slider 12, that is, the shape of the porous alumina ceramic body 8 is the same as the shape of the supporting slider 12 reduced in proportion, and the volume of the porous alumina ceramic body 8 is equal to or less than 1 / 2 of the volume of the supporting slider 12.

[0036] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A new type of rolling and sliding composite bearing structure, comprising an outer rotating body and an inner rotating body, characterized in that: A supporting slider and a roller are arranged between the inner and outer rotating bodies, at least two rollers are arranged between adjacent supporting sliders, and the left and right sides of each supporting slider are in contact with the rollers, and the left and right sides of each roller are in contact with the side of the supporting slider or the side of the roller; The upper and lower sides of the supporting slider are both arc-shaped, the arc radius of the upper side of the supporting slider is smaller than the inner diameter of the outer rotary body, and the arc radius of the lower side of the supporting slider is larger than the outer diameter of the inner rotary body; Upper chamfers with a length greater than 2mm are provided on both sides of the arc radius of the upper side of the supporting slider, and lower chamfers with a length greater than or equal to 2mm and a plane with a length greater than or equal to 2mm transitioning to the middle are provided on both sides of the arc radius of the lower side of the supporting slider.

2. The novel rolling-sliding composite bearing structure according to claim 1 is characterized in that: Three rollers are arranged between adjacent supporting slide blocks.

3. The novel rolling-sliding composite bearing structure according to claim 1 is characterized in that: The inner rotating body is a tooth palm bearing or a floating structure at the lower part of the roller bit, and the outer rotating body is a roller.

4. The novel rolling-sliding composite bearing structure according to claim 1 is characterized in that: The outer periphery of the supporting slider is provided with a titanium coating.

5. The novel rolling-sliding composite bearing structure according to claim 1 is characterized in that: A cavity is provided in the middle of the supporting sliding block, and a porous alumina ceramic body is fixed in the cavity.

6. The novel rolling-sliding composite bearing structure as claimed in claim 5 is characterized in that: The outer side surface of the porous alumina ceramic body is arranged in parallel with the outer side surface of the corresponding supporting slider, and the volume of the porous alumina ceramic body is equal to or less than 1 / 2 of the volume of the supporting slider.

7. The novel rolling-sliding composite bearing structure according to claim 1 is characterized in that: The width between the left side and the right side of the supporting sliding block is 0.8 to 3 times the diameter of the roller.

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