Roller bit structure

Abstract

The utility model relates to a roller bit structure, and belongs to a drilling tool used in the technical fields of petroleum and natural gas, mine engineering, building foundation engineering construction, geology, hydrology, non-excavation construction and the like. The roller bit structure comprises a bit body, the bit body comprises a bit leg shaft and a roller, and the bit leg shaft and the roller are configured to form an annular roller path; a rolling body is arranged in the annular raceway, and a mounting hole for mounting the rolling body into the annular raceway is formed in the cone. The cone can be locked on the cone palm shaft through the rolling body installed in the annular raceway between the cone palm shaft and the cone, meanwhile, it is guaranteed that the cone can rotate around the cone palm shaft, in the installation process, a plug pin hole does not need to be formed in the cone palm, the strength and the service life of the cone palm shaft cannot be affected, and the service life of the cone palm shaft is prolonged. The rolling body can directly penetrate into the annular raceway between the cone palm shaft and the cone through the mounting hole in the cone, and finally, the mounting hole can be sealed by the plugging block, so that the rolling body can stably play a role.

Description

Technical Field

[0001] The present application relates to the technical field of drilling tools, and in particular to a roller drill bit structure. Background Art

[0002] At present, steel balls are used to lock the cones on the cone palms during the manufacture of roller bits. In actual use, after the bearing of the roller bit fails, the wear of the steel balls accelerates. There is a risk that the cone will fall to the bottom of the well. Once the cone falls into the well, it is difficult to salvage it, which increases the time for drilling and salvaging, and may fill the well, greatly increasing the drilling cost. A Chinese patent discloses a new structure of roller bits, application number: 201410031377.3, which discloses connecting the roller seat to the roller drum, and connecting the two with two tapered roller bearings. This structure uses a bearing structure, which has very poor sealing performance underground and is easy to enter impurities, resulting in premature failure of the bearing.

[0003] In the related art, a roller drill bit with a rolling bearing structure disclosed in Chinese patent application number 201922106965.X, and a roller drill bit with a tapered roller locking disclosed in Chinese patent application number 201921223930.8, both adopt the method of opening a pin hole on the tooth palm, installing a rolling body between the tooth palm and the tooth wheel, avoiding the use of a bearing structure between the tooth palm and the tooth wheel, and improving stability. However, the pin hole is opened on the tooth palm, and the pin hole and the lubrication channel for grease on the tooth palm are staggered, which reduces the strength of the tooth palm at the axial diameter, which is not conducive to the service life of the tooth palm.

[0004] Therefore, it is necessary to study and improve the above structure and provide a roller drill bit structure in order to achieve a more practical purpose. Summary of the invention

[0005] The embodiment of the present application provides a roller drill bit structure to solve the problem in the related art that a pin hole is opened on the tooth palm, the pin hole and the lubrication channel for grease on the tooth palm are staggered, which reduces the strength of the tooth palm at the axial diameter and is not conducive to the service life of the tooth palm.

[0006] The present application embodiment provides a roller drill bit structure, comprising:

[0007] The drill body comprises a tooth palm shaft and a cone. The tooth palm shaft and the cone are configured to form an annular raceway. A rolling body is arranged in the annular raceway. The cone is provided with a mounting hole for installing the rolling body into the annular raceway.

[0008] In some embodiments, the rolling element is a tapered roller, and the tapered roller is in a truncated cone shape;

[0009] The top surface and side surface of the tapered roller are in contact with the raceway groove on the tooth palm shaft, the bottom surface and side surface of the tapered roller are in contact with the raceway groove on the tooth palm shaft, and the raceway groove on the tooth palm shaft and the raceway groove on the gear form the annular raceway.

[0010] In some embodiments, the mounting hole passes through the inner wall and the outer wall of the cone, and the diameter of the mounting hole gradually increases along the inner wall of the cone toward the outer wall.

[0011] In some embodiments, the tooth palm shaft includes a large diameter section and a small diameter section coaxially arranged, the diameter of the small diameter section gradually increases in the direction away from the large diameter section, and the end face of the large diameter section and the side face of the small diameter section form a raceway groove on the tooth palm shaft.

[0012] In some embodiments, an inner ring groove is provided on the cone, a cylindrical roller is installed in the inner ring groove, and a side surface of the cylindrical roller is in contact with and fits with a side surface of the large diameter section.

[0013] In some embodiments, the tooth palm shaft includes a large diameter section and a small diameter section that are coaxially arranged, the surface of the small diameter section cooperates with the inner wall of the tooth wheel, and the annular raceway is formed between the large diameter section and the tooth wheel.

[0014] In some embodiments, a step surface is formed between the large diameter section and the small diameter section, and a thrust surface cooperating with the step surface is provided in the gear.

[0015] In some embodiments, wear-resistant rings that contact and fit with each other are installed on the step surface and the thrust surface.

[0016] In some embodiments, the diameter of the small diameter section gradually decreases in the direction away from the large diameter section, and an outer ring groove is provided on the surface of the small diameter section. A roller is installed in the outer ring groove, and the side surface of the roller is in contact with the inner wall of the gear.

[0017] In some embodiments, a blocking block is installed in the installation hole, and an annular cavity for installing a sealing ring is formed between the tooth palm shaft and the tooth wheel.

[0018] The beneficial effects of the technical solution provided by this application include:

[0019] An embodiment of the present application provides a roller drill bit structure. Since the drill bit body includes a roller shaft and a roller, the roller shaft and the roller are configured to form an annular raceway, rolling bodies are installed in the annular raceway, and the roller is provided with a mounting hole for installing the rolling body into the annular raceway.

[0020] Therefore, the present application can utilize the rolling body installed in the annular raceway between the tooth palm shaft and the gear to lock the gear on the tooth palm shaft, while ensuring that the gear can rotate around the tooth palm shaft. Moreover, during the installation process, there is no need to open a pin hole on the tooth palm, which will not affect the strength and service life of the tooth palm shaft. The rolling body can be directly inserted into the annular raceway between the tooth palm shaft and the gear through the installation hole on the gear. Finally, the installation hole can be closed with a block to ensure that the rolling body can function stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic structural diagram of a first roller drill bit provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of a second roller drill bit provided in an embodiment of the present application;

[0024] Figure 3 A schematic structural diagram of a third roller drill bit provided in an embodiment of the present application;

[0025] Figure 4 A schematic structural diagram of a fourth roller drill bit provided in an embodiment of the present application.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Toothed shaft; 2. Gear; 3. Rolling element; 4. Mounting hole; 5. Large diameter section; 6. Small diameter section; 7. Inner ring groove; 8. Cylindrical roller; 9. Step surface; 10. Thrust surface; 11. Wear-resistant ring; 12. Outer ring groove; 13. Roller; 14. Block; 15. Annular cavity. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The embodiment of the present application provides a roller drill bit structure, which can solve the problem in the related art that a pin hole is opened on the tooth palm, the pin hole and the lubrication channel for grease on the tooth palm are staggered, which reduces the strength of the tooth palm at the axial diameter and is not conducive to the service life of the tooth palm.

[0030] See also Figures 1 to 4 As shown, the embodiment of the present application provides a roller drill bit structure, including:

[0031] The drill body comprises a tooth palm shaft 1 and a cone 2. The tooth palm shaft 1 and the cone 2 are configured to form an annular raceway, in which a rolling body 3 is arranged. The cone 2 is provided with a mounting hole 4 for mounting the rolling body 3 into the annular raceway.

[0032] The drill bit body of the roller drill bit structure of the embodiment of the present application is provided with a palm shaft 1 and a roller 2, and an annular raceway is formed at the corresponding position between the palm shaft 1 and the roller 2, and a rolling body 3 is installed in the annular raceway. The roller 2 is provided with a mounting hole 4 for installing the rolling body 3 into the annular raceway.

[0033] Specifically, after the gear 2 is mounted on the toothed shaft 1, the rolling element 3 is installed into the annular raceway through the mounting hole 4 on the gear 2. Depending on the actual space conditions of the annular raceway, a retaining cage may be used or not. The rolling element 3 may be in a truncated cone shape or a cylindrical shape according to the cross-section of the annular raceway.

[0034] While installing, rotate the cone 2 to facilitate the installation of the next rolling body 3 into the annular raceway. After the annular raceway between the palm shaft 1 and the cone 2 is filled with rolling bodies 3, install a blocking block 14 into the mounting hole 4 on the cone 2 and weld the blocking block 14 to ensure that the rolling body 3 locks the cone 2 on the palm shaft 1, and the cone 2 can rotate around the palm shaft 1.

[0035] Since there is no need to open a pin hole on the tooth palm, the strength and service life of the tooth palm shaft 1 will not be affected. At the same time, since the structure of the gear 2 is simple and the surface area is large, the installation hole 4 opened on the gear 2 has little effect on the structural strength of the gear 2, which is better than the situation of opening a pin hole on the tooth palm shaft 1.

[0036] In some alternative embodiments: See Figures 1 to 4 As shown, the embodiment of the present application provides a roller drill bit structure, the rolling element 3 of the roller drill bit structure is a tapered roller, and the tapered roller is in a truncated cone shape;

[0037] The top and side surfaces of the tapered roller are in contact with the raceway groove on the tooth palm shaft 1, and the bottom and side surfaces of the tapered roller are in contact with the raceway groove on the tooth palm shaft 1. The raceway groove on the tooth palm shaft 1 and the raceway groove on the cone 2 form an annular raceway.

[0038] The rolling element 3 of the embodiment of the present application is a tapered roller in the shape of a truncated cone. Both the tooth palm shaft 1 and the gear 2 are provided with raceway grooves. The raceway grooves on the tooth palm shaft 1 and the raceway grooves on the gear 2 form an annular raceway. After the tapered roller is installed, its top surface and side surface are in contact with the raceway grooves on the tooth palm shaft 1, and its bottom surface and side surface are in contact with the raceway grooves on the tooth palm shaft 1.

[0039] During specific use, the bottom and side surfaces of the tapered roller are in contact with the raceway groove on the tooth palm shaft 1, so that the gear 2 can stably withstand the axial pressure, and the top and side surfaces of the tapered roller are in contact with the raceway groove on the tooth palm shaft 1, so that the gear 2 can stably withstand the axial tension, thereby ensuring that the rolling body 3 locks the gear 2 on the tooth palm shaft 1 while the gear 2 can also rotate around the tooth palm shaft 1.

[0040] In some alternative embodiments: See Figures 1 to 4 As shown, an embodiment of the present application provides a roller drill bit structure, in which a mounting hole 4 passes through the inner wall and the outer wall of the roller 2, and the diameter of the mounting hole 4 gradually increases along the direction from the inner wall of the roller 2 toward the outer wall.

[0041] The mounting hole 4 of the embodiment of the present application passes through the inner wall and the outer wall of the gear 2, and the diameter of the mounting hole 4 gradually increases from the inner wall of the gear 2 toward the outer wall. It is suitable for truncated cone-shaped tapered rollers and has the advantage that the tapered rollers can be easily inserted into the mounting hole 4 for installation.

[0042] During the specific installation, after the gear 2 is sleeved on the tooth palm shaft 1, the small end of the tapered roller is installed toward the mounting hole 4. Since the diameter of the mounting hole 4 gradually increases from the inner wall of the gear 2 toward the outer wall, the tapered roller can quickly slide into the annular raceway along the mounting hole 4, which has the advantage of easy installation. The mounting hole 4 is small in size and has little effect on the strength of the gear 2.

[0043] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides a roller drill bit structure, wherein the roller drill bit structure has a tooth palm shaft 1 comprising a coaxially arranged large diameter section 5 and a small diameter section 6, wherein the diameter of the small diameter section 6 gradually increases in a direction away from the large diameter section 5, and the end face of the large diameter section 5 and the side face of the small diameter section 6 form a raceway groove on the tooth palm shaft 1.

[0044] The tooth palm shaft 1 of the embodiment of the present application is a stepped shaft, which includes a large diameter section 5 and a small diameter section 6 which are coaxially arranged. The small diameter section 6 is located at the end, and the diameter of the small diameter section 6 gradually increases in the direction away from the large diameter section 5. The end face of the large diameter section 5 and the side face of the small diameter section 6 form a raceway groove on the tooth palm shaft 1.

[0045] During specific installation, the small end face of the truncated cone-shaped tapered roller contacts and cooperates with the end face of the large diameter section 5, the side face of the tapered roller contacts and cooperates with the side face of the small diameter section 6, and at the same time, the large end face and side face of the tapered roller contact and cooperate with the inner wall of the cone 2, thereby ensuring that the cone 2 can stably withstand axial tension and axial pressure.

[0046] In some alternative embodiments: See Figure 2 As shown, an embodiment of the present application provides a roller drill bit structure, in which an inner ring groove 7 is provided on the roller 2 of the roller drill bit structure, and a cylindrical roller 8 is installed in the inner ring groove 7, and the side surface of the cylindrical roller 8 is in contact with the side surface of the large diameter section 5.

[0047] An inner ring groove 7 is formed in the cone 2 of the embodiment of the present application. A circle of cylindrical rollers 8 is installed in the inner ring groove 7. The side surfaces of the cylindrical rollers 8 are in contact with the side surfaces of the large diameter section 5, so that the cone 2 can stably withstand radial pressure.

[0048] During the specific installation, before the gear 2 is mounted on the tooth palm shaft 1, a circle of cylindrical rollers 8 is installed in the inner ring groove 7, and then the gear 2 is mounted on the tooth palm shaft 1. The top wall and bottom wall of the inner ring groove 7 are used to respectively match the two end surfaces of the cylindrical roller 8, and the side surfaces of the cylindrical roller 8 are rollingly matched with the side surfaces of the large diameter section 5, thereby ensuring that the gear 2 can stably withstand radial pressure.

[0049] In this embodiment, tapered rollers and cylindrical rollers 8 are used, the thrust is borne by the end face of the small diameter section 6, and the locking function is borne by the tapered roller. For example, a sealing ring is mounted on the large diameter section 5, and then the cylindrical roller 8 is installed in the inner ring groove 7 of the cone, and then the cone 2 is installed on the cone palm shaft 1, and the cone 2 is pushed to the bottom end of the cone palm shaft 1.

[0050] Keep the mounting hole 4 aligned with the annular raceway, then install the tapered roller into the annular raceway through the mounting hole 4, and rotate the gear 2 around the tooth palm axis 1 while installing until all the tapered rollers in the annular raceway are installed, and finally block the mounting hole 4 with the blocking block 14 and fix the blocking block 14.

[0051] In some alternative embodiments: See Figure 3 and Figure 4 As shown, an embodiment of the present application provides a roller drill bit structure, wherein the roller palm shaft 1 of the roller drill bit structure includes a coaxially arranged large diameter section 5 and a small diameter section 6, the surface of the small diameter section 6 cooperates with the inner wall of the roller 2, and an annular raceway is formed between the large diameter section 5 and the roller 2.

[0052] The tooth palm shaft 1 of the embodiment of the present application includes a large diameter section 5 and a small diameter section 6 which are coaxially arranged. The end face of the small diameter section 6 can axially limit the gear 2. The large diameter section 5 is provided with a raceway groove which cooperates with the tapered roller. The corresponding inner wall of the gear 2 is provided with a raceway groove which cooperates with the tapered roller. The raceway groove on the large diameter section 5 and the raceway groove on the gear 2 form an annular raceway.

[0053] During the specific installation, the raceway grooves on the large diameter section 5 and the raceway grooves on the cone 2 form an annular raceway. Since the raceway grooves are arranged on the large diameter section 5, compared with the raceway grooves being arranged on the small diameter section 6, the annular raceway in this example has a larger ring diameter and can accommodate a larger number of tapered rollers. The total contact area between the tapered rollers and the cone 2 is large, which can increase the axial force that the cone 2 can withstand.

[0054] In some alternative embodiments: See Figure 3 As shown, an embodiment of the present application provides a roller drill bit structure, in which a step surface 9 is formed between the large diameter section 5 and the small diameter section 6 of the roller drill bit structure, and a thrust surface 10 cooperating with the step surface 9 is provided in the roller 2.

[0055] The tooth palm shaft 1 of the embodiment of the present application is a stepped shaft, which includes a coaxially arranged large diameter section 5 and a small diameter section 6, wherein the small diameter section 6 is located at the end, and a step surface 9 is formed between the large diameter section 5 and the small diameter section 6. The tooth wheel 2 has a thrust surface 10 that cooperates with the step surface 9. When the tooth wheel 2 is subjected to axial pressure, the thrust surface 10 abuts against the step surface 9, which can play the role of axially limiting the tooth wheel 2.

[0056] In some alternative embodiments: See Figure 3 As shown, an embodiment of the present application provides a roller drill bit structure, on which a wear-resistant ring 11 that contacts and cooperates with each other is installed on the step surface 9 and the thrust surface 10 of the roller drill bit structure.

[0057] In the embodiment of the present application, wear-resistant rings 11 are installed on the step surface 9 and the thrust surface 10, which are in contact with each other. The wear-resistant rings 11 can prevent the step surface 9 and the thrust surface 10 from being damaged due to contact and wear. Specifically, the wear-resistant rings 11 on the step surface 9 and the thrust surface 10 can be fixedly installed by slotting and embedding.

[0058] In some alternative embodiments: See Figure 4 As shown, an embodiment of the present application provides a roller drill bit structure, in which the diameter of the small diameter section 6 of the roller drill bit structure gradually decreases in the direction away from the large diameter section 5, and an outer ring groove 12 is provided on the surface of the small diameter section 6. A roller 13 is installed in the outer ring groove 12, and the side surface of the roller 13 is in contact with the inner wall of the roller 2.

[0059] The large diameter section 5 and the small diameter section 6 are coaxially arranged on the tooth palm shaft 1 of the embodiment of the present application, and the diameter of the small diameter section 6 gradually decreases in the direction away from the large diameter section 5. An outer ring groove 12 is opened on the side of the small diameter section 6, and a circle of rollers 13 are installed in the outer ring groove 12. The side surfaces of the rollers 13 are in contact with the inner wall of the tooth wheel 2. Specifically, the rollers 13 can be cylindrical or truncated cone-shaped, and can withstand the axial pressure of the tooth wheel 2.

[0060] For example, in some implementations, tapered rollers are used at both the upper and lower parts, the tapered roller installed at the large diameter section 5 bears the axial tension, and the tapered roller installed at the small diameter section 6 bears the pressure. A sealing ring is installed on the large diameter section 5, and a tapered roller is installed in the outer ring groove 12 on the small diameter section 6, and then the cone 2 is installed on the cone palm shaft 1, and the cone 2 is pushed to the bottom end of the cone palm shaft 1.

[0061] Keep the mounting hole 4 aligned with the annular raceway, then install the tapered roller into the annular raceway through the mounting hole 4, and rotate the gear 2 around the tooth palm axis 1 while installing until all the tapered rollers in the annular raceway are installed, and finally block the mounting hole 4 with the blocking block 14 and fix the blocking block 14.

[0062] In some alternative embodiments: See Figures 1 to 4 As shown, an embodiment of the present application provides a roller drill bit structure, in which a block 14 is installed in the mounting hole 4 of the roller drill bit structure, and an annular cavity 15 for installing a sealing ring is formed between the bit palm shaft 1 and the roller 2.

[0063] A block 14 is installed in the mounting hole 4 of the embodiment of the present application. Specifically, the block 14 is fixed in the mounting hole 4 by welding, which does not affect the rolling of the rolling body 3 in the annular raceway. At the same time, an annular cavity 15 is formed between the tooth palm shaft 1 and the tooth wheel 2, and a sealing ring can be installed in the annular cavity 15 to seal the lubricating oil.

[0064] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the 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 the specific circumstances.

[0065] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0066] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A roller drill bit structure, It is characterized in that include: A drill bit body comprises a tooth palm shaft (1) and a tooth wheel (2), wherein the tooth palm shaft (1) and the tooth wheel (2) are configured to form an annular raceway, a rolling body (3) is arranged in the annular raceway, and a mounting hole (4) is provided on the tooth wheel (2) for mounting the rolling body (3) in the annular raceway.

2. The roller drill bit structure according to claim 1, Features: The rolling body (3) is a tapered roller, and the tapered roller is in a truncated cone shape; The top surface and side surface of the tapered roller are in contact with the raceway groove on the tooth palm shaft (1), the bottom surface and side surface of the tapered roller are in contact with the raceway groove on the tooth palm shaft (1), and the raceway groove on the tooth palm shaft (1) and the raceway groove on the gear (2) form the annular raceway.

3. The roller drill bit structure according to claim 1, Features: The mounting hole (4) passes through the inner wall and the outer wall of the cone (2), and the diameter of the mounting hole (4) gradually increases along the direction from the inner wall of the cone (2) toward the outer wall.

4. The roller drill bit structure according to claim 1, Features: The tooth palm shaft (1) comprises a large diameter section (5) and a small diameter section (6) which are coaxially arranged, wherein the diameter of the small diameter section (6) gradually increases in a direction away from the large diameter section (5), and the end surface of the large diameter section (5) and the side surface of the small diameter section (6) form a rolling groove on the tooth palm shaft (1).

5. The roller drill bit structure according to claim 4, Features: The gear wheel (2) is provided with an inner ring groove (7), a cylindrical roller (8) is arranged in the inner ring groove (7), and the side surface of the cylindrical roller (8) is in contact with the side surface of the large diameter section (5).

6. The roller drill bit structure according to claim 1, Features: The tooth palm shaft (1) comprises a large diameter section (5) and a small diameter section (6) which are coaxially arranged, the surface of the small diameter section (6) matches the inner wall of the tooth wheel (2), and the annular raceway is formed between the large diameter section (5) and the tooth wheel (2).

7. The roller drill bit structure according to claim 6, Features: A step surface (9) is formed between the large diameter section (5) and the small diameter section (6), and a thrust surface (10) matching the step surface (9) is provided in the gear (2).

8. The roller drill bit structure according to claim 7, Features: The step surface (9) and the thrust surface (10) are provided with wear-resistant rings (11) that are in contact with each other.

9. The roller drill bit structure according to claim 6, Features: The diameter of the small diameter section (6) gradually decreases in the direction away from the large diameter section (5); an outer ring groove (12) is provided on the surface of the small diameter section (6); a roller (13) is arranged in the outer ring groove (12); and the side surface of the roller (13) contacts and cooperates with the inner wall of the gear (2).

10. The roller drill bit structure according to claim 1, Features: A blocking block (14) is installed in the installation hole (4), and an annular cavity (15) for installing a sealing ring is formed between the tooth palm shaft (1) and the tooth wheel (2).

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