Roller bit of high-capacity lubricating grease compensation system
By designing a large-capacity lubricating grease compensation system in the palm of the tooth drill bit, using the cooperation of the stepped hole and the piston, the problems of complex structure and high manufacturing cost in the prior art are solved, and the bearing life is extended.
Patent Information
- Application Number
- CN202420218910.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-30
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-01-30
AI Technical Summary
The lubricating grease compensation system of existing gear drill bits is complex in structure and large in number of parts, which leads to high manufacturing costs and is difficult to effectively extend the life of gear drill bit bearings.
A large-capacity lubricating grease compensation system is adopted. By forming step holes in the palm of the tooth, the cross-sectional area of the oil storage hole and the oil-through hole is significantly different. The combination of the piston and the retaining ring is used to achieve grease compensation and balance and improve the lubrication conditions of the bearing.
The pressure balance and lubrication conditions in the gear drill bit bearing are achieved, and the service life of the gear drill bit bearing is extended.
Smart Images
Figure CN222436298U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of roller drill bits for oil, natural gas and mining drilling, and more specifically, to a roller drill bit with a large-capacity lubricating grease compensation system. Background Art
[0002] The existing roller drill bit includes at least one tooth palm and one cone, and a common roller drill bit includes three tooth palms and three cones. The bearing of the roller drill bit usually includes two structures: a sealed bearing and a non-sealed bearing.
[0003] In order to extend the life of the roller drill bit bearing, a lubricating grease compensation system is usually provided for the roller drill bit with sealed bearing. Figure 2 As shown in the figure, the most widely used lubricating grease compensation system of the roller bit comprises an elastic retaining ring 61, a gland 62, a gland sealing ring 63, an oil bag protection cup 64 and a rubber oil storage bag 65. Its working principle is to compensate the grease in the oil bag to the roller bit bearing cavity by using the deformation of the rubber oil storage bag 65. The disadvantage of this structure is that the lubricating grease compensation system structure contains a large number of parts, a complex structure and a high manufacturing cost. Utility Model Content
[0004] The utility model aims to provide a roller drill bit with a large-capacity lubricating grease compensation system to solve the shortcomings of the prior art and achieve the purpose of increasing the bearing life of the roller drill bit.
[0005] The utility model solves the technical problem by adopting a technical solution: a roller drill bit with a large-capacity lubricating grease compensation system, comprising at least one roller and a roller, characterized in that the roller has a lubricating grease compensation system inside, and the lubricating grease compensation system comprises:
[0006] A stepped hole is formed on the tooth palm by turning, milling, drilling or boring, the large end of the stepped hole is an oil storage hole, and the small end of the stepped hole is an oil through hole; the oil through hole is connected with the bearing cavity of the roller drill bit through the plug pin hole; a piston is built into the oil storage hole, and a retaining ring is provided at the oil storage hole opening.
[0007] As a further solution of the utility model, the cross-sectional area of the oil storage hole 23 is significantly larger than the cross-sectional area of the oil through hole 25 .
[0008] Preferably, the radial cross-sectional area of the oil storage hole is 5 to 20 times the radial cross-sectional area of the oil passage hole.
[0009] Preferably, the retaining ring is provided with a pressure transmission hole; and the retaining ring is welded, bonded or riveted to the orifice of the oil storage hole.
[0010] Preferably, the diameter of the oil storage hole is 10-50 mm and the depth is 20-80 mm; the surface roughness Ra of the oil storage hole is ≤0.8 μm.
[0011] Preferably, the piston and the oil storage hole are clearance-matched; at least one sealing groove is provided on the piston, and a piston sealing ring is installed in each sealing groove. The space between the piston sealing ring and the bearing sealing ring is filled with lubricating grease after vacuuming through the oil filling hole, and the opening of the oil filling hole is sealed with a screw plug.
[0012] Preferably, the cone is provided with a plurality of cutting teeth.
[0013] Preferably, a thread is provided at the top of the tooth palm; and a shaft neck is provided at the bottom of the tooth palm and is rotatably connected to the gear.
[0014] The utility model includes at least the following beneficial effects: a roller drill bit with a large-capacity lubricating grease compensation system can store a large amount of lubricating grease in the oil storage hole, achieve pressure balance inside the roller bearing, improve the lubrication conditions of the roller drill bit bearing friction pair, and thus extend the service life of the roller drill bit bearing.
[0015] 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
[0016] Figure 1 Schematic diagram of the structure of the roller drill bit of this embodiment;
[0017] Figure 2 It is a structural schematic diagram of a lubricating grease compensation system in the prior art;
[0018] Figure 3 Schematic diagram of the structure of a large-capacity lubricating grease compensation system in an embodiment of the present application.
[0019] 1. Roller bit; 2. Tooth palm; 3. Roller; 4. Cutting teeth; 11. Cylindrical roller; 12. Steel ball; 13. Bearing seal ring; 21. Inner hole of drill bit; 23. Oil storage hole; 24. Oil filling hole; 25. Oil through hole; 26. Pin hole; 27. Bottom surface of oil storage hole; 31. Piston; 32. Piston seal ring; 33. Top surface of piston; 34. Bottom surface of piston; 35. Circlip; 36. Pressure transmission hole; 61. Elastic circlip; 62. Gland; 63. Gland seal ring; 64. Oil bladder protection cup; 65. Rubber oil bladder. DETAILED DESCRIPTION
[0020] 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.
[0021] 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.
[0022] An embodiment of the utility model is further described in detail below in conjunction with the accompanying drawings.
[0023] like Figure 1 As shown, in this embodiment, the roller drill bit 1 generally includes three tooth palms 2 and three rollers 3. The bottom end of the tooth palm 2 is provided with a shaft neck rotatably connected to the roller 3. The drill bit is a roller drill bit 1 with a large-capacity grease compensation system and a diameter of 311 mm (the imperial size is 12 1 / 4"), which includes three tooth palms 2 and three rollers 3. A large-capacity grease compensation system is arranged inside each tooth palm to balance the pressure inside and outside the bearing cavity. The large-capacity grease compensation system is characterized by: comprising a retaining ring 35, an oil hole 25, a piston 31, a piston sealing ring 32, an oil hole 25 and a plug pin hole 26. The top surface 33 of the piston is connected to the drilling slag removal medium through the pressure transmission hole 36 of the retaining ring 35, and the space between the piston sealing ring 32 and the bearing sealing ring 13 is filled with grease. The tooth palm 2 blank is formed into an oil storage hole 23, an oil hole 25 and an oil filling hole 24 by a machining method.
[0024] The assembly process of the gear and the palm is as follows: install the cylindrical roller 11 in the cylindrical roller groove of the gear (not shown), install the bearing seal 13 between the palm 2 and the gear 3, install the palm shaft neck into the inner hole of the gear, and then install the steel ball 12.
[0025] During the use of the roller drill bit, the thread on the upper part of the drill bit 1 is first connected to the thread on the drilling tool such as the drill pipe or the screw, and the roller drill bit is driven by a turntable or a top drive, or driven by a downhole tool such as a screw. The roller drill bit 1 rotates and moves along a predetermined route, and the cutting teeth 4 on the roller continuously impact the rock, thereby breaking the rock to form the desired wellbore.
[0026] like Figure 1As shown, the three cones of the roller drill bit 1 adopt the number of tooth rows (No. 1 cone with 5 rows of teeth; No. 2 cone with 5 rows of teeth; No. 3 cone with 4 rows of teeth), and a plurality of cutting teeth 4 are arranged on each tooth row.
[0027] like Figure 3 As shown, the tooth palm 2 is machined from a blank to form an oil storage hole 23 and an oil through hole 25.
[0028] like Figure 3 As shown, the oil storage hole 23 has a diameter of 40 mm and a depth of 65 mm, and the oil through hole 25 has a diameter of 10 mm.
[0029] like Figure 3 As shown, the axial dimension of the piston 31 is 30 mm. The piston 31 with the piston seal ring 32 installed is installed into the oil storage hole 23, and then the retaining ring 35 is installed and the retaining ring 35 is welded firmly to the orifice of the oil storage hole.
[0030] like Figure 3 As shown, vacuum is drawn through the oil filling hole 24, and the bottom surface 34 of the piston contacts the bottom surface 27 of the oil storage hole; after vacuum is drawn, lubricating grease is injected through the oil filling hole 24, and the pressurized lubricating grease pushes the piston to move upward until the top surface 33 of the piston contacts the bottom surface 36 of the retaining ring 35, and a screw plug is installed at the opening of the oil filling hole.
[0031] 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.
[0032] It should be noted that, in this application, relational terms such as "number one" and "number two" 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 "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0033] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments, 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 these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied for herein. Although the embodiments of the present utility model have been disclosed as above, they are not limited to the use listed in the specification and the implementation mode, and it can be fully applied to various fields suitable for the present utility model. For those familiar with the art, other modifications can be easily realized, so without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to specific details and the embodiments shown and described here.
Claims
1. A roller drill bit with a large-capacity lubricating grease compensation system, comprising at least one roller and one roller, characterized in that: The tooth palm is provided with a lubricating grease compensation system, and the lubricating grease compensation system comprises: A stepped hole is formed on the tooth palm, the large end of the stepped hole is an oil storage hole, and the small end of the stepped hole is an oil through hole; the oil through hole is connected with the bearing cavity of the roller drill through the plug pin hole; a piston is built in the oil storage hole, and a retaining ring is provided at the oil storage hole opening.
2. The roller drill bit of the large-capacity lubricating grease compensation system according to claim 1, characterized in that: The cross-sectional area of the oil storage hole is 5 to 20 times the cross-sectional area of the oil passage hole.
3. The roller drill bit of the large-capacity lubricating grease compensation system according to claim 1, characterized in that: The retaining ring is provided with a pressure transmission hole; the retaining ring is welded, bonded or riveted to the orifice of the oil storage hole.
4. The roller drill bit of the large-capacity lubricating grease compensation system according to claim 1 or 2, characterized in that: The diameter of the oil storage hole is 10-50 mm and the depth is 20-80 mm; the surface roughness Ra of the oil storage hole is ≤0.8 μm.
5. The roller drill bit of the large-capacity lubricating grease compensation system according to claim 1, characterized in that: The piston and the oil storage hole are clearance-matched; at least one sealing groove is provided on the piston, and a piston sealing ring is installed in each sealing groove.
6. The roller drill bit of the large-capacity lubricating grease compensation system according to claim 1, characterized in that: The cone is provided with a plurality of cutting teeth.
7. The roller drill bit of the large-capacity lubricating grease compensation system according to claim 1 or 6, characterized in that: The top of the tooth palm is provided with a thread; the bottom of the tooth palm is provided with a shaft neck and is rotatably connected with the gear.