Hybrid drill bit capable of limiting axial movement of cones

Abstract

The invention relates to a hybrid drill bit for limiting axial movement of a cone, which comprises a drill bit body provided with a cone mounting part; the cone body is arranged in the cone mounting part, one axial end face of the cone body abuts against the drill bit body, and the end face, abutting against the cone body, of the drill bit body forms a cone assembling face; the axial clamping piece and the cone body are coaxially arranged; and the matching piece is arranged on at least one end of the assembly surface of the cone body and the cone, and is matched and clamped with the axial clamping piece. Through clamping matching of the axial clamping piece and the matching piece, clamping of the cone body relative to the drill bit body in the axial direction is achieved, then axial movement of the cone body is reduced, and axial clamping of the cone body is achieved while normal rotation of the cone body is not affected. The problems that in the rotating process of the cone, due to axial tiny movement, a connecting structure of the inner cone and the cone leg of the cone is prone to loosening and aggravating abrasion under the long-term high-pressure and high-torque environment are solved.

Description

Technical Field

[0001] This application relates to the field of PDC drill bits, and more particularly to a hybrid drill bit that restricts the axial movement of roller cones. Background Technology

[0002] In the fields of oil and gas exploration and geological drilling, hybrid drill bits are widely used in formations with alternating soft and hard surfaces or complex abrasive formations because they combine the high cutting efficiency of PDC drill bits with the low torque stability of roller cone drill bits. Traditional hybrid drill bits typically use ball locking technology at the tooth bearing, which limits the axial displacement of the roller cone through the friction between the balls and the inner and outer rings of the bearing.

[0003] However, in practical applications, while ball locking provides some axial restraint, its effect depends on the contact stress between the balls and the bearing. During rotation, the roller cone may still experience slight axial movement due to drilling fluid pressure fluctuations, rock impact loads, or mechanical vibrations, making it difficult to completely eliminate the risk of axial movement under dynamic conditions. This axial movement can cause solid particles in the drilling mud, such as sand and rock cuttings, to intrude into the bearing sealing system, accelerating abrasive wear. At the same time, axial displacement exacerbates adhesive wear and fatigue failure of the inner and outer rings of the bearing, making the connection structure between the inner cone and the tooth prong prone to loosening under long-term high-pressure and high-torque environments. Ultimately, this can lead to the roller cone falling off, significantly shortening the drill bit's service life. Summary of the Invention

[0004] This application provides a hybrid drill bit that restricts the axial movement of the roller cone, in order to solve the problem in the related art that the connection structure between the inner cone and the tooth plate is prone to loosening and aggravated wear under long-term high pressure and high torque environment due to slight axial movement of the roller cone during rotation.

[0005] This application provides a hybrid drill bit for limiting axial movement of roller cones, comprising: The drill bit body has a toothed cone mounting section; A roller cone body is disposed within the roller cone mounting portion, and one axial end face of the roller cone body abuts against the drill bit body. The end face of the drill bit body that abuts against the roller cone body forms a roller cone mounting surface. An axial snap-fit ​​component is coaxially arranged with the roller body and simultaneously engages with both the roller mounting surface and the roller body. And a mating component, which is disposed on at least one end of the toothed wheel body and the toothed wheel assembly surface, and engages with the axial snap-fit ​​component.

[0006] In one embodiment, the axial snap-fit ​​member includes a protruding block that is coaxially connected to the toothed wheel body; The roller body and the roller mounting surface have at least one snap-fit ​​hole adapted to the protrusion to form the mating part.

[0007] In one embodiment, the protruding block is disposed on one end of the toothed wheel body and the toothed wheel mating surface; The other end of the roller body and the roller mounting surface is provided with a snap-fit ​​hole that matches the protruding block to form a mating part.

[0008] In one embodiment, the protruding block is coaxially arranged with the roller body and simultaneously abuts against both the roller body and the roller mounting surface. Both the roller cone body and the roller cone mounting surface are provided with snap-fit ​​holes adapted to the protruding block to form a mating part. The protruding block simultaneously engages with the snap-fit ​​holes on both the roller cone body and the roller cone mounting surface.

[0009] In one embodiment, a hybrid drill bit that restricts axial movement of the roller cone further includes: A wear-resistant layer is disposed on at least one end of the mating part and the axial snap-fit ​​part.

[0010] In one embodiment, a hybrid drill bit that restricts axial movement of the roller cone further includes: A sealing layer is disposed between the mating member and the axial snap-fit ​​member.

[0011] In one embodiment, a hybrid drill bit that restricts axial movement of the roller cones further includes: The toothed body is disposed within the toothed wheel mounting portion, with the other end of the toothed wheel body abutting against the toothed body in the axial direction, and the toothed wheel body and the toothed body being rotatably connected.

[0012] In one embodiment, a hybrid drill bit that restricts axial movement of the roller cone further includes: A clamping pad is disposed within the toothed cone mounting portion and located between the drill bit body and the toothed cone body.

[0013] In one embodiment, the toothed wheel body and the toothed palm body are connected by a ball bearing.

[0014] In one embodiment, a hybrid drill bit that restricts axial movement of the roller cones further includes: A sealing structure is disposed on the contact surface of at least one end of the toothed body and the toothed body.

[0015] The beneficial effects of the technical solution provided in this application include: by adding an axially engaging component coaxially arranged with the roller cone body, and providing a mating component for accommodating the axially engaging component on at least one end of the roller cone body and the roller cone assembly surface, the roller cone body can be axially clamped relative to the drill bit body during the assembly process of the roller cone body on the drill bit body through the engagement of the axially engaging component and the mating component, thereby reducing the axial movement of the roller cone body. This achieves axial clamping of the roller cone body without affecting its normal rotation, and solves the problem that the connection structure between the inner cone and the tooth plate of the roller cone is prone to loosening and aggravated wear under long-term high pressure and high torque environment due to slight axial movement during the rotation of the roller cone.

[0016] This application provides a hybrid drill bit that restricts the axial movement of roller cones. Because it adds an axial clamping member and a mating member that can clamp the roller cone body onto the drill bit body in the axial direction, it achieves axial clamping of the roller cone body relative to the drill bit body and reduces the axial movement of the roller cone body. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A cross-sectional view of a first type of hybrid drill bit for limiting axial movement of roller cones, provided in an embodiment of this application; Figure 2 A cross-sectional view of a second type of hybrid drill bit for limiting axial movement of roller cones provided in an embodiment of this application; Figure 3 A cross-sectional view of a third type of hybrid drill bit for limiting axial movement of roller cones provided in an embodiment of this application; Figure 4 A cross-sectional view of a fourth type of hybrid drill bit for limiting axial movement of roller cones provided in an embodiment of this application; Figure 5 A schematic diagram of a hybrid drill bit structure for limiting axial movement of roller cones provided in an embodiment of this application; In the diagram: 1. Drill body; 11. Roller cone mounting part; 2. Roller cone body; 3. Axial snap-fit ​​part; 4. Mating part; 41. Wear-resistant layer; 5. Tooth body; 51. Clamping pad; 52. Ball bearing; 53. Sealing structure; 6. Cutter wing; 61. Nozzle; 62. Fixed cutting tooth. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] This application provides a hybrid drill bit that restricts the axial movement of the roller cone, which can solve the problem in related technologies that the connection structure between the inner cone and the tooth plate is prone to loosening and aggravated wear under long-term high pressure and high torque environment due to slight axial movement of the roller cone during rotation.

[0021] Reference Figure 1 This application provides a hybrid drill bit that restricts the axial movement of roller cones. It includes a drill body 1, a roller cone body 2, an axial locking member 3, and a mating member 4. The drill body 1 has a roller cone mounting portion 11 for mounting the roller cones and roller plates to form a hybrid drill bit. The roller cone body 2 is disposed within the roller cone mounting portion 11. One axial end face of the roller cone body 2 abuts against the drill body 1, and the end face of the drill body 1 abutting against the roller cone body 2 forms a roller cone mounting surface. The roller cones are capable of rotating along their own axial direction. The axial locking member 3 is coaxially arranged with the roller body 2. The mating member 4 is arranged on at least one end of the roller body 2 and the roller assembly surface, and engages with the axial locking member 3 to achieve axial clamping of the roller body 2, thereby restricting the axial movement of the roller body 2. While not affecting the normal rotation of the roller body 2, it achieves axial clamping of the roller body 2, which solves the problem that the connection structure between the inner cone and the tooth plate of the roller is prone to loosening and aggravated wear under long-term high pressure and high torque environment due to slight axial movement during the rotation of the roller.

[0022] More specifically, the axial locking member 3 includes a protruding block, which is coaxially arranged with the gear. At least one end of the gear body 2 and the gear mounting surface has a locking hole adapted to the protruding block to form a mating member 4. During the assembly of the gear body 2 with the gear mounting part 11, the protruding block and the gear body 2 are axially abutted, and the protruding block is locked into the locking hole. The protruding block and the locking hole are interference-fitted in a direction perpendicular to the axial direction of the gear body 2, so that the axial locking of the gear body 2 can be achieved without affecting the rotation of the gear body 2.

[0023] In one embodiment of this application, the protruding block is coaxially fixed to one end of the roller body 2 on the roller mounting surface, and a snap-fit ​​hole adapted to the protruding block is provided on the other end of the roller body 2 and the roller mounting surface to form a mating part 4. (Refer to...) Figure 1Taking the embodiment of this application as an example, the protruding block is coaxially connected to the gear body 2. The protruding block and the gear body 2 are integrally formed so that the connection between the protruding block and the gear body 2 is stable. The gear assembly surface is provided with a snap-fit ​​hole corresponding to the size of the protruding block so that the protruding block can be snapped into the snap-fit ​​hole, thereby achieving axial clamping of the gear body 2.

[0024] In other embodiments of this application, a protruding block coaxial with the roller body 2 can be provided on the roller assembly surface, and a snap-fit ​​hole can be opened on the end face of the roller body 2 that abuts against the roller assembly surface. This can also achieve the snap-fit ​​between the protruding block and the snap-fit ​​hole along the axial direction of the roller body 2. The specific settings can be flexibly changed according to the actual processing needs and convenience.

[0025] Reference Figure 2 In one embodiment of this application, the protruding block is configured as a split structure. Both the roller body 2 and the roller assembly surface are provided with snap-fit ​​holes adapted to the protruding block to form a mating part 4. During the installation of the roller body 2 and the roller assembly surface, the protruding block is simultaneously snapped into the snap-fit ​​holes on both the roller body 2 and the roller assembly surface. The protruding block and the snap-fit ​​hole are interference-fitted, which can also achieve axial clamping of the roller body 2.

[0026] More specifically, the protruding block is specifically designed as a solid rectangular block, and the locking hole is designed as a rectangular groove corresponding to the shape of the protruding block, so as to facilitate positioning and locking with the locking block while maintaining its own structural strength. In another embodiment of this application, the end of the protruding block that contacts the locking hole can also be designed as an arc shape, and the locking hole can be designed as an arc groove that fits the arc shape of the protruding block, while the other end of the protruding block is still designed as a rectangle. The rectangular design of the protruding block makes it easier to connect the protruding block with the roller cone body 2 or the drill bit body 1, and the arc-shaped end face that contacts the locking hole can reduce the rigidity loss between the protruding block and the locking hole, and extend the service life of the protruding block. Alternatively, when the protruding block adopts a split design, the protruding block can be designed as an ellipse, and an arc groove that fits it can be opened on the roller cone mounting surface and the roller cone body 2, which can also achieve axial clamping of the roller cone body 2. The specific shape of the protruding block and the locking hole can be flexibly changed according to the actual working conditions.

[0027] During the initial fabrication of the protruding block, when the protruding block is mounted on the roller cone body 2, it can be integrally fabricated coaxially with the roller cone body 2 during production. A corresponding opening hole is made on the roller cone mounting surface to form the mating part 4. When the protruding block is mounted on the roller cone mounting surface, it can be integrally fabricated coaxially with the roller cone mounting surface axis during production of the drill bit body 1. A matching snap-fit ​​hole is made on the abutment surface of the roller cone body 2 to form the mating part 4. When the protruding block is fabricated separately, it can be made of cemented carbide. The hardness of the selected cemented carbide should not be less than that of the materials used to manufacture the roller cone body 2 and the drill bit body 1 to ensure rigid clamping of the roller cone body 2 during long-term use.

[0028] Furthermore, to further improve the service life of the mating part 4 and the axial locking part 3, at least one end of the mating part 4 and the axial locking part is also provided with wear resistance to reduce wear from prolonged rigid contact. (Refer to...) Figure 3 In one embodiment of this application, the snap-fit ​​hole is formed on the gear assembly surface, and the wear-resistant layer 41 is coated on the inner wall of the snap-fit ​​hole to extend its service life when a rigid fit is achieved between the protruding block and the snap-fit ​​hole. In another embodiment of this application, the wear-resistant layer 41 can also be coated on the end face of the protruding block that abuts against the snap-fit ​​hole, which can also achieve the wear-resistant effect. For cases where the protruding block is a split structure, the wear-resistant layer 41 can also be coated on the entire surface of the protruding block to achieve the wear-resistant effect.

[0029] To improve the sealing performance between the mating part 4 and the axial locking part 3, a sealing layer is applied between the mating part 4 and the axial locking part in the axial gap of the roller cone body 2. This further enhances the sealing performance between the mating part 4 and the axial locking part 3 without affecting the rotation of the roller cone body 2. To ensure the sealing reliability of the mating part 4 and the axial locking part 3 under dynamic conditions during drilling, the design of the sealing layer must consider both the material properties and the structural compatibility between the mating part 4 and the axial locking part 3. This sealing layer typically uses polymeric materials with excellent elasticity and self-recovery capabilities, such as fluororubber, silicone rubber, or polyurethane-based elastomers. Their molecular chain structure gives the material unique stress relaxation characteristics, allowing it to maintain continuous contact pressure even with axial micro-displacements caused by temperature changes or mechanical vibrations in the mating part 4, effectively blocking minute axial displacements.

[0030] Furthermore, the sealing layer can be designed with a gradient structure, with the inner layer using wear-resistant modified materials, such as graphite-filled polytetrafluoroethylene composites, while the outer layer retains a highly elastic matrix. This design can adapt to the dynamic friction requirements during rotational motion and enhance sealing durability through the synergistic effect of the multi-layer structure. For the high-temperature environment generated by rotation during drilling, the sealing layer can be made of heat-resistant materials such as ceramic nano-coatings or perfluororubber. Their thermal stability can prevent the sealing layer from hardening or creeping during long-term operation, while the microporous structure on the surface of heat-resistant materials such as ceramic nano-coatings or perfluororubber can also form capillary action, further enhancing the self-adaptive ability of the sealing layer. For corrosive media conditions in the drilling environment, the sealing layer can use chemically inert materials such as polyetheretherketone or polyvinylidene fluoride. Their molecular bond energy can resist the erosion of media such as acids, alkalis, and salts, while their low surface properties can inhibit the adhesion of media to the sealing layer. It is worth noting that modern sealing materials often optimize friction performance by adjusting the crosslinking density or adding lubricating microparticles, such as molybdenum disulfide, so that the sealing layer can maintain the sealing effect while controlling the rotational resistance within an acceptable range. This material innovation not only meets the sealing requirements, but also avoids the risk of mechanical jamming caused by excessive constraint.

[0031] More specifically, the hybrid drill bit disclosed in this application embodiment for limiting the axial movement of the roller cones also includes a toothed body 5. One end of the roller cone body 2, axially away from the roller cone mounting surface, abuts against the toothed body 5. The roller cone body 2 and the toothed body 5 are connected by a ball bearing 52, enabling the roller cone body 2 to rotate relative to the toothed body 5 along its own axis. During installation, the toothed body 5 with the roller cone body 2 mounted is inserted into the roller cone mounting part 11, and the protruding block is inserted into the snap-fit ​​component, thus completing the relative installation between the toothed body 5, the roller cone body 2, and the drill bit body 1.

[0032] Since grease needs to be injected into the oil reservoir to lubricate the ball bearing 52 during later use, a sealing structure 53 is provided on at least one end of the contact surface of the roller body 2 and the roller bearing 5 to seal the contact gap between the roller body 2 and the roller bearing 5. A rubber block can typically be used as the sealing structure 53 for sealing. More specifically, in one embodiment of this application, the inner layer of the sealing structure 53 is a highly elastic rubber matrix, such as fluororubber or hydrogenated nitrile rubber, whose strongly polar groups in the molecular chain can form a stable physical adsorption film, effectively blocking the migration of the medium through capillary action; the middle layer embeds an oil-resistant reinforcing material, such as polyimide fiber or aramid fabric, which improves the resistance to media swelling through the fiber network structure; the outer layer uses a low-friction coefficient coating material, such as polytetrafluoroethylene micro-powder modified rubber, which reduces rotational friction resistance and avoids oil separation caused by shearing action of the grease. Furthermore, the cross-sectional shape of the sealing structure 53 can be optimized into a V-shaped or U-shaped corrugated shape, absorbing axial vibration energy through periodic deformation while maintaining continuous contact at the sealing interface using elastic restoring force. To address the lubrication requirements of the oil reservoir, a microporous permeable layer can be pre-set in the sealing structure 53, employing a gradient porosity design. This allows grease to be directionally delivered to the ball bearing 52 along axial capillary channels while preventing reverse intrusion of external impurities through surface tension. This multi-dimensional material design not only improves the durability of the sealing structure 53 but also achieves synergistic optimization of the mechanical and sealing performance between the roller body 2 and the roller bearing 5 through controllable lubrication medium transport.

[0033] Furthermore, since there is an interference fit between the mating part 4 and the axial locking part 3, there is also an interference fit between the roller cone body 2 and the drill bit body 1. In order to facilitate the assembly of the roller cone body 2 and the tooth holder body 5 into the roller cone mounting part 11, refer to Figure 2 This application embodiment also includes a clamping pad 51, which is also disposed within the roller cone mounting portion 11 and located between the roller cone body 5 and the drill bit body 1. Taking one embodiment of this application as an example, when assembling the roller cone body 2, the protruding block on the roller cone body 2 is first inserted into the snap-fit ​​hole on the roller cone mounting surface. At this time, there is a gap between the roller cone body 5 and the end of the drill bit body 1 away from the roller cone mounting surface within the roller cone mounting portion 11. The clamping pad 51 is then inserted into the gap, thereby realizing the assembly of the roller cone body 5 and the roller cone body 2. Furthermore, a gap is reserved for the fit between the protruding block and the snap-fit ​​hole, making assembly more convenient.

[0034] In other embodiments of this application, reference is made to Figure 4When assembling the toothed body 5 and the roller cone body 2 onto the drill body 1, the clamping pad 51 may not be used. Instead, the roller cone body 2 has a snap-fit ​​hole along the axial direction. After snapping the toothed body 5 and the roller cone body 2 into the roller cone mounting part 11 on the drill body 1, a hole is drilled on the surface of the drill body 1 corresponding to the axial direction of the roller cone body 2, and the hole communicates with the snap-fit ​​hole on the roller cone body 2. The protruding block is then inserted into the drill body 1 through the opening on the surface of the drill body 1 until the protruding block snaps into the snap-fit ​​hole on the roller cone body 2. This also completes the assembly of the toothed body 5 and the roller cone body 2 onto the drill body 1.

[0035] Specifically, in this application, the drill bit body 1 is also equipped with three cutter wings 6 and six nozzles 61. Fixed cutting teeth 62 are also installed on each part of the cutter wings 6. The fixed cutting teeth 62 are diamond composite sheets, and the fixed cutting teeth 62 on the cutter wings 6 cover the entire bottom of the cutter wings 6 from the inside out. The drill bit body 1 is equipped with three toothed body bodies 5. Each toothed body body 5 is equipped with a toothed cone body 2 via a ball bearing 52. The toothed body bodies 5 are all fixed within the toothed cone mounting part 11 of the drill bit body 1 by clamping pads 51, so as to cooperate with the fixed cutting teeth 62 to form a hybrid drill bit.

[0036] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0037] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A hybrid drill bit for restricting axial movement of roller cones, characterized in that, It includes: The drill bit body (1) has a toothed cone mounting part (11). The roller cone body (2) is disposed in the roller cone mounting part (11). One end face of the roller cone body (2) in the axial direction abuts against the drill bit body (1). The end face of the drill bit body (1) abutting against the roller cone body (2) forms the roller cone mounting surface. An axial snap-fit ​​member (3) is coaxially arranged with the roller body (2) and simultaneously connected to both the roller mounting surface and the roller body (2). And, a mating part (4) is disposed on at least one end of the toothed body (2) and the toothed assembly surface, and is engaged with the axial snap-fit ​​part (3).

2. A hybrid drill bit for restricting axial movement of roller cones as described in claim 1, characterized in that: The axial snap-fit ​​member (3) includes a protruding block that is coaxially connected to the toothed wheel body (2); The roller body (2) and the roller assembly surface have at least one snap-fit ​​hole adapted to the protruding block to form the mating part (4).

3. A hybrid drill bit for restricting axial movement of roller cones as described in claim 2, characterized in that: The protruding block is disposed on one end of the toothed wheel body (2) and the toothed wheel assembly surface; The toothed wheel body (2) and the other end of the toothed wheel assembly surface are provided with a snap-fit ​​hole adapted to the protruding block to form a mating part (4).

4. A hybrid drill bit for limiting axial movement of roller cones as described in claim 2, Its characteristics are: The protruding block is coaxially arranged with the roller body (2) and simultaneously abuts against the roller body (2) and the roller mounting surface; Both the roller body (2) and the roller assembly surface are provided with snap-fit ​​holes adapted to the protruding block to form a mating part (4). The protruding block simultaneously engages with the roller body (2) and the snap-fit ​​holes on the roller assembly surface.

5. A hybrid drill bit for restricting axial movement of roller cones as described in claim 1, characterized in that, It also includes: A wear-resistant layer (41) is disposed on at least one end of the mating part (4) and the axial snap-fit ​​part (3).

6. A hybrid drill bit for limiting axial movement of roller cones as described in claim 1, characterized in that, It also includes: A sealing layer is disposed between the mating part (4) and the axial snap-fit ​​part (3).

7. A hybrid drill bit for limiting axial movement of roller cones as described in claim 1, characterized in that, Also includes: The toothed body (5) is disposed in the toothed wheel mounting part (11), and the other end of the toothed wheel body (2) abuts against the toothed body (5) in the axial direction. The toothed wheel body (2) and the toothed body (5) are rotatably connected.

8. A hybrid drill bit for limiting axial movement of roller cones as described in claim 7, characterized in that, It also includes: A clamping pad (51) is disposed inside the toothed wheel mounting part (11) and located between the drill bit body (1) and the toothed wheel body (5).

9. A hybrid drill bit for limiting axial movement of roller cones as described in claim 7, characterized in that: The toothed wheel body (2) and the toothed palm body (5) are connected by a ball bearing (52).

10. A hybrid drill bit for limiting axial movement of roller cones as described in claim 7, characterized in that, Also includes: A sealing structure (53) is disposed on the contact surface of at least one end of the toothed body (2) and the toothed body (5).

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