A nut, shaft assembly and power unit

Abstract

This application discloses a nut, a shaft assembly, and a power unit. The nut includes a nut body, with a threaded portion on the inner ring for threaded connection with a component to be assembled. The outer ring of the nut body has circumferentially distributed nesting grooves for engaging with the threaded portion to lock and limit the assembly of the component. This nut, by integrating the nesting groove and threaded portion structure, achieves simultaneous locking and limiting of multiple components to be assembled, improving assembly efficiency. It is suitable for high-speed, high-load mechanical devices, enhancing operational reliability.

Description

Technical Field

[0001] This application relates to the technical fields of nuts, shaft assembly parts, and power units, and in particular, to a nut, shaft assembly part, and power unit. Background Technology

[0002] In existing technologies, nuts are mostly single-function designs, achieving single-point locking of shaft components solely through thread preload or spring plate structures. This makes it difficult to simultaneously meet the combined locking and limiting requirements of internal and external bearings within the shaft system. Traditional lubrication systems often employ oil sump or oil pipe delivery methods, failing to provide directional guidance of oil to internal and external bearings. This can easily lead to oil mixing, leakage, or insufficient local lubrication, affecting the long-term performance of mechanical components. Furthermore, the nut and oil guiding structure are typically designed independently, failing to achieve unified integration of locking, limiting, and lubrication control functions. This results in complex structures, high costs, and an inability to meet the comprehensive requirements of high precision, high stability, and high cleanliness in power machinery systems. Summary of the Invention

[0003] This application provides a nut, shaft assembly, and power unit, which achieves dual locking and limiting of the parts to be assembled by integrating a threaded portion and a nested groove in the nut.

[0004] According to one aspect of this application, an embodiment of this application provides a nut, including: a nut body, wherein the inner ring of the nut body is provided with a threaded portion, the threaded portion being used for threaded connection with a component to be assembled;

[0005] The outer circumferential ring of the nut body has nested grooves, which are used to cooperate with the threaded part to lock and limit the assembly of the component.

[0006] Optionally, the nut further includes a baffle located at one end of the nut body, and the baffle has a ring-shaped structure.

[0007] Optionally, the annular inner hole surface includes a beveled surface at a preset angle.

[0008] Optionally, the inner surface of the baffle also includes a horizontal plane, with the oblique surface located outside the inner hole and the horizontal plane located inside the inner hole.

[0009] Optionally, the nesting groove extends through the axial direction of the nut body.

[0010] According to another aspect of this application, embodiments of this application provide a shaft system assembly, the shaft system assembly comprising:

[0011] A nut, comprising a nut body; the inner ring of the nut body is provided with a threaded portion; the outer ring of the nut body is circumferentially distributed with nesting grooves;

[0012] The shaft body has an external thread at one end for engaging with the threaded portion to restrict the axial movement of the shaft body; and the external thread of the shaft body has a positioning groove.

[0013] The locking piece is a ring structure and is sleeved on the shaft body. The locking piece has a first boss and a second boss. The first boss cooperates with the positioning groove and the second boss cooperates with the nesting groove to restrict the circumferential movement of the shaft body.

[0014] Optionally, a locking plate track is provided at a position away from the end of the shaft body with external threads; the locking plate moves circumferentially along the locking plate track so that the second boss engages with the nesting groove.

[0015] Optionally, the shaft body includes an inner shaft and an outer shaft; the inner shaft is fitted with an inner bearing, and the inner shaft is along the axial direction of the nut body and passes through the nut body;

[0016] The outer shaft is fitted with an outer bearing and is positioned between the inner bearing and the outer bearing; one end of the outer shaft is provided with an external thread for engaging with the threaded portion to restrict the axial movement of the outer shaft; the external thread of the outer shaft is provided with a positioning groove; the first boss engages with the positioning groove and the second boss engages with the nested groove to restrict the radial movement of the outer shaft.

[0017] Optionally, the assembly may further include a retaining ring and a housing; the nut may further include a baffle.

[0018] The baffle is located at one end of the nut body, and the baffle is an annular structure; the inner surface of the annular hole includes a beveled surface with a preset angle;

[0019] The retaining ring is a sleeve with an annular shaft cap at one end, and the retaining ring cooperates with the outer shell to fix the outer bearing;

[0020] The outer casing is provided with an oil inlet hole at a preset angle, and the oil inlet hole and the inner hole form an oil passage.

[0021] According to another aspect of this application, an embodiment of this application provides a power device, including the aforementioned nut or shaft assembly.

[0022] This application discloses a nut, including a nut body. The inner ring of the nut body has a threaded portion for threaded connection with a component to be assembled. The outer ring of the nut body has circumferentially distributed nested grooves for engaging with the threaded portion to lock and limit the components to be assembled. This nut, by integrating the nested groove and threaded portion structure, achieves synchronous locking and limiting of multiple components to be assembled, improving assembly efficiency. It is suitable for high-speed, high-load mechanical devices, enhancing operational reliability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the nut according to a preferred embodiment of this application;

[0024] Figure 2 This is a cross-sectional three-dimensional schematic diagram of the nut and a partial enlarged view of one end of the baffle according to a preferred embodiment of this application;

[0025] Figure 3 This is a cross-sectional three-dimensional schematic diagram of the shaft assembly according to a preferred embodiment of this application;

[0026] Figure 4 This is a partial cross-sectional schematic diagram of the shaft assembly according to a preferred embodiment of this application;

[0027] Figure 5 This is a three-dimensional schematic diagram of the locking plate according to a preferred embodiment of this application;

[0028] Figure 6 This is a three-dimensional schematic diagram of the outer shaft of a preferred embodiment of this application;

[0029] Figure 7 This is a three-dimensional schematic diagram of the assembly of the outer shaft and locking plate according to a preferred embodiment of this application;

[0030] Figure 8 This is a three-dimensional schematic diagram of the assembly of the nut, locking plate and outer shaft according to a preferred embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Nut body; 101. Threaded part; 102. Nesting groove; 103. Baffle; 1031. Beveled surface; 1032. Horizontal surface; 104. Relief groove; 2. Inner shaft; 3. Outer shaft; 31. Positioning groove; 32. External thread; 33. Locking plate track; 4. Inner bearing; 5. Outer bearing; 6. Inner shaft washer; 7. Outer shaft washer; 8. Inner shaft retaining ring; 9. Retaining ring; 10. Washer; 11. Outer shell; 111. Oil inlet hole; 12. Locking plate; 121. First boss; 122. Second boss; 13. Bearing symmetry line. Detailed Implementation

[0033] 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, and 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 protection scope of this application.

[0034] It should be noted that the technical solutions of the embodiments of this application are described below using... Figures 1-8 When describing one of the accompanying drawings (the target drawing), in order to present some technical details more clearly and completely, legends from other drawings besides this drawing will also be used. In this process, all legend names (including but not limited to component names, identifier symbols, structural codes, etc.) and drawing numbers involved in all drawings are unique and consistent in this application document. There are no conflicts or confusions in legend names or numbers, nor does it mean that the technical description of the target drawing is unclear, incomplete or ambiguous, nor does it affect those skilled in the art from accurately understanding the technical solutions of the embodiments of this application based on the content disclosed in this application document.

[0035] See Figure 1 The nut body 1 includes a nut body 1, the inner ring of which is provided with a threaded portion 101 for threaded connection with the component to be assembled, and the outer ring of the nut body 1 is provided with a nesting groove 102 for cooperating with the threaded portion 1 to lock and limit the component to be assembled.

[0036] Preferably, the nut further includes a baffle 103, which is located at one end of the nut body 1 and has a ring-shaped structure.

[0037] It should be noted that, see Figure 2The nut body 1 has a threaded portion 101 on its inner ring for threaded connection with the component to be assembled. The component is locked by rotating the nut, for example, by threading the nut body 1 with a shaft component. The outer ring of the nut body 1 has evenly distributed nesting grooves 102, which can engage with corresponding bosses on the component to be assembled, thus locking and limiting the component. The nut body has a cylindrical shell structure, and its inner ring also has a tool relief groove 104 to ensure the machining quality of the threaded portion 101 and the end face of the baffle 103. At the end of the cutting process, the tool relief groove 104 provides space for the tool to exit. In this embodiment, the nut achieves dual locking and limiting of the component to be assembled by integrating the threaded portion 101 and the nesting grooves 102. The nesting grooves 102 engage with the component to limit its axial and radial displacement, further enhancing the nut's locking capability. Furthermore, the nut body 1 also includes a baffle 103, which is located at one end of the nut body 1 and has an annular structure. It is stably connected to one end of the nut body 1. Lubricating oil flows into the part to be assembled through the annular baffle 103. The nut controls the inflow and outflow of lubricating oil through the baffle 103, thereby further controlling the lubrication and cleanliness of the part to be assembled.

[0038] Preferably, the annular inner hole surface includes a beveled surface 1031 at a preset angle. The beveled surface 1031 ensures that the lubricating oil is precisely guided to the critical areas of the component to be assembled, thereby reducing friction. Simultaneously, the inclined design of the beveled surface 1031 guides the lubricating oil inwards while reducing splashing or leakage into the external environment, ensuring that the lubricant remains within the required working area. Further, the beveled surface 1031 has a 45° sharp angle structure. It should be noted that this embodiment does not limit the inclination angle of the beveled surface 1031; it can be 45°, 40°, or 50°, as long as the inclination angle of the beveled surface 1031 matches the angle of the oil inlet hole on the component to be assembled, ensuring precise flow of the lubricating oil.

[0039] Preferably, the inner surface of the baffle 103 further includes a horizontal surface 1032, with the oblique surface 1031 located on the outer side of the inner hole and the horizontal surface 1032 located on the inner side of the inner hole.

[0040] It should be noted that the outer side of the aforementioned inner hole refers to the side closer to the external environment or the fixed housing in the assembled state. The beveled surface 1031 is located here, and its function is to accurately receive and axially guide lubricating oil from the outside, and reduce splashing and leakage. The inner side of the inner hole refers to the side closer to the inside of the shaft system, bearings, and other components to be assembled in the assembled state. The horizontal surface 1032 is located here, which can form a smooth transition channel, reduce flow resistance, and ensure that the lubricating oil can flow stably and continuously to the critical areas that require lubrication. That is, the flatness of the horizontal surface 1032 reduces oil flow resistance and ensures the stability of lubricating oil flow. Furthermore, the transition design between the beveled surface 1031 and the horizontal surface 1032 forms a gradual flow path, reducing turbulence or interruption of oil flow, helping to maintain the continuity of the lubrication circuit, ensuring that the lubricating oil is evenly distributed throughout the threaded connection area and the components to be assembled. In addition, the horizontal surface 1032 can avoid stress concentration caused by the beveled surface 1031 on the baffle 103, improving the safety of the baffle 103.

[0041] Preferably, the nesting groove 102 extends through the axial direction of the nut body 1, so that the component to be assembled is deeply fitted with the nut, improving the locking and limiting ability. Furthermore, the nesting groove 102 is distributed along the outer circumference of the nut body 1 to ensure the symmetry and uniformity of the nut when under force.

[0042] It should be noted that the thread tolerance grade of the nut body in this embodiment is 3H, and the tolerance grade of the external thread of the shaft component is 3g, to achieve a tight fit. The baffle 103 of the nut body 1 adopts a ring structure with a thickness of 2-4mm. The baffle 103 can be manufactured separately from the nut body 1 and assembled by connecting the two, or the baffle 103 can be manufactured as an integral part of the nut body 1. This embodiment does not impose any restrictions on this.

[0043] Furthermore, the nut of this application is used to lock and limit multiple components to be assembled, and at the same time lubricate them. This application can be applied to the locking and limiting of shaft components, and can also be applied to other locking and assembly requirements of similar structures. The following embodiments are described in detail for application to assembling shaft components.

[0044] A preferred embodiment of this application provides a shaft assembly, which includes a nut, a nut body 1, an inner ring of which has a threaded portion 101, and an outer ring of which has circumferentially distributed nesting grooves 102. The shaft assembly also includes a shaft body, one end of which has an external thread 32. The external thread 32 engages with the threaded portion 101 to restrict the axial movement of the shaft body, and a positioning groove 31 is provided at the external thread 32 of the shaft body. The shaft assembly also includes a locking piece 12, which is an annular structure and sleeved on the shaft body. The locking piece 12 has a first boss 121 and a second boss 122. The first boss 121 engages with the positioning groove 31, and the second boss 122 engages with the nesting groove 102 to restrict the circumferential movement of the shaft body. Figure 3 This is a cross-sectional three-dimensional schematic diagram of the shaft assembly according to a preferred embodiment of this application. In order to better understand its internal structure, the cross-sectional three-dimensional schematic diagram of this embodiment is obtained by cutting the assembly, removing a portion of the cut parts, and leaving another portion of the cut parts so that its three-dimensional internal cross-sectional structure can be observed.

[0045] It should be noted that, see Figure 3 and Figure 4 The shaft assembly includes a nut, a shaft body, and a locking plate 12. One end of the shaft body is provided with an external thread 32, which is threadedly connected to the threaded portion 101 of the nut body 1. By rotating the nut body 1, the shaft body is locked and its axial movement is restricted. See also Figure 5 The locking plate 12 has a ring structure and is sleeved on the shaft body. The locking plate 12 is provided with a first boss 121 and a second boss 122. The first boss 121 and the second boss 122 cooperate with the shaft body and the nut body 1 to restrict the circumferential movement of the shaft body. In this way, the threaded part 101 and the nesting groove 102 of the nut body 1 achieve double locking and limiting of the shaft body. The bearing symmetry line 13 can be the symmetry line of the bearing, the symmetry line of the shaft body, or the symmetry line of the shaft system assembly. This embodiment does not limit this and the specific determination depends on the type of assembly in the shaft system assembly.

[0046] Furthermore, a locking plate track 33 is provided at a position away from the end of the shaft body with external threads. The locking plate 12 moves circumferentially along the locking plate track 33 so that the second boss 122 engages with the nesting groove 102.

[0047] Furthermore, the shaft body includes an outer shaft 3, an inner shaft 2, an inner bearing 4, and an outer bearing 5. The inner shaft 2 is fitted with the inner bearing 4, that is, the outer ring of the inner shaft 2 is provided with the inner bearing 4. The inner bearing 4 is located between the outer ring of the inner shaft 2 and the inner ring of the outer shaft 3. The inner shaft 2 is along the axial direction of the nut body 1 and passes through the nut body 1. The outer shaft 3 is fitted with the outer bearing 5, that is, the outer bearing 5 is located on the outer ring of the outer shaft 3. The outer shaft 3 is located between the inner bearing 4 and the outer bearing 5. Furthermore, an external thread 32 is provided at the outer ring of one end of the shaft 3 for cooperating with the threaded part 101 to restrict the axial movement of the outer shaft 3. The outer shaft 3 and the nut body 1 are coaxial. A positioning groove 31 is provided at the external thread 32 of the outer shaft 3. The first boss 121 cooperates with the positioning groove 31 and the second boss 122 cooperates with the nesting groove 102 to restrict the radial movement of the outer shaft 3.

[0048] It should be noted that, see Figure 5 and Figure 6 The external thread 32 is located on the outer ring of the outer shaft 3. The positioning groove 31 is evenly distributed along the circumference of the external thread 32 and passes through the axial direction of the external thread 32. A locking plate track 33 is provided on the outer shaft 3 at a position away from the end where the external thread 32 is provided. The locking plate track 33 is an annular slide rail. The locking plate track 33 is coaxial with the outer shaft 3. The bottom end of the locking plate track 33 is adjacent to the top end of the positioning groove 31. The locking plate moves circumferentially along the locking plate track 33 so that the first boss 121 cooperates with the positioning groove 31 and the second boss 122 cooperates with the nesting groove 102. The diameter of the inner ring of the locking plate 12 is equal to the diameter of the outer ring of the outer shaft 3, and the diameter of the outer ring of the locking plate 12 is greater than the diameter of the outer ring of the outer shaft 3.

[0049] Furthermore, the first boss 121 of the locking plate 12 is located on the inner ring of the locking plate 12, the second boss 122 is located on the outer ring of the locking plate 12, and the positioning groove 31 provides radial assembly space for the locking plate 12. See also Figure 7 and Figure 8During installation, the first boss 121 is axially sleeved on the outer shaft 3 through the positioning groove 31 and moves to the inner ring of the outer shaft 3. The first boss 121 is snapped into the inner ring of the outer shaft 3 to connect the locking piece 12 with the outer shaft 3. Then, the locking piece 12 is rotated through the locking piece track 33 to adjust the position of the second boss 122. The second boss 122 is adjusted to be aligned with the nesting groove 102 of the nut body 1. Then, the second boss 122 and the nesting groove 102 are engaged. When the nut tends to loosen, the second boss 122 will contact the side wall of the nesting groove 102 and transmit the loosening force to the fixed locking piece 12 to achieve reliable axial and circumferential locking. In this embodiment, the sliding of the locking plate 12 is guided by the locking plate track 33 to adjust the axial displacement of the locking plate 12 along the outer shaft 3, and a reserved position is provided for the nut body 1 to be installed on the outer shaft 3 to adjust the thread engagement degree between the nut body 1 and the outer shaft 3; the axial length of the first boss 121 of the locking plate 12 is consistent with the axial length of the positioning groove 31, so that the first boss 121 is engaged with the inner ring of the locking plate 12 and the locking plate 12 moves axially along the locking plate track 33; the radial width of the first boss 121 of the locking plate 12 is smaller than the axial radial width of the positioning groove 31, so that the first boss 121 is engaged with the inner ring of the locking plate 12 and the locking plate 12 moves axially along the locking plate track 33. 121 can smoothly enter the inner ring of the outer shaft 3; the number of first bosses 121 is not less than 2. If the number of positioning grooves 31 is 2, the positioning grooves 31 are symmetrically arranged on the left and right sides along the external thread 32; the number of second bosses 122 is an even number not less than 2, so as to achieve uniform force and stable connection between the locking plate 12 and the nut body 1. Correspondingly, the number of second bosses 122 can correspond to the number of nesting grooves 102, so as to achieve stable connection between the locking plate 12 and the nut body 1. Furthermore, the second bosses 122 are ram's horn structures to improve the locking degree of the locking plate 12 on the nut body 1.

[0050] Preferably, the shaft assembly further includes an inner shaft washer 6, an outer shaft washer 7, and an inner shaft retaining ring 8; wherein, the inner shaft washer 6 is disposed on the outer ring of the inner shaft 2 and connected to the inner ring of the inner bearing 4; the outer shaft washer 7 is located on one side of the inner ring of the outer shaft 3 and connected to one side of the outer ring of the inner bearing 4; the inner shaft retaining ring 8 is located on the other side of the inner ring of the outer shaft 3 and connected to the other side of the outer ring of the inner bearing 4; the inner shaft retaining ring 8, the inner shaft washer 6, and the outer shaft washer 7 are used to radially limit the inner shaft 2.

[0051] Preferably, the shaft assembly further includes a retaining ring 9 and a housing 11. The nut also includes a baffle 103, which is located at one end of the nut body 1 and has an annular structure. The annular inner hole surface includes a beveled surface 1031 with a preset angle. The retaining ring 9 is a sleeve with an annular shaft cover at one end. The retaining ring 9 cooperates with the housing 11 to fix the outer bearing 5. The housing 11 has an oil inlet hole 111 with a preset angle, which forms an oil passage with the inner hole. Further, the outer ring of the outer bearing 5 is connected to the retaining ring 9, and the axial displacement of the outer bearing 5 is restricted by the retaining ring 9 and the locking piece 12. The retaining ring 9 has an annular structure and is connected to the housing 11 by screws, enclosing the entire device and ensuring the sealing and stability of the overall structure. The beveled surface 1031 of the inner hole of the baffle 103 has a 45° sharp angle structure, which is used to guide the flow of lubricating oil and ensure smooth oil distribution. The two oil passages (i.e., the outer oil passage and the inner oil passage) formed by the baffle 103 with the sharp angle structure are V-shaped. The lubricating oil is guided through the outer oil passage into the area of ​​the shaft assembly that needs lubrication, and the inner oil passage blocks the backflow of oil. The V-shaped dual oil passage channel realizes the directional guidance of lubricating oil, avoids oil mixing and leakage, and improves the service life of the shaft assembly. It should be noted that this embodiment does not limit the tilt angle of the beveled surface 1031, as long as the tilt angle of the beveled surface 1031 is consistent with the preset angle of the oil inlet hole 111 opened in the outer shell 11.

[0052] Furthermore, the inner surface of the baffle 103 also includes a horizontal surface 1032, with the oblique surface 1031 located on the outside of the inner hole and the horizontal surface 1032 located on the inside of the inner hole. The transition design of the oblique surface 1031 and the horizontal surface 1032 forms a gradual oil passage design, reducing oil flow turbulence or interruption and helping to maintain the continuity of the lubrication oil passage. It should be noted that the plane located inside the inner hole is parallel to the axial direction of the annulus. This plane is represented in different ways in different views or assembly drawings at different angles. For example, it is shown as a horizontal plane 1032 in the front view of the assembly drawing, but from the front view after rotating a certain angle, the plane appears to be a vertical plane. For the plane located inside the inner hole, whether it is a horizontal plane 1032 or a vertical plane is just a way of representing it in assembly drawings at different angles. This embodiment does not limit this. In addition, the outer side of the inner hole refers to the side closer to the outer shell 11 in the assembled state, and the inner side of the inner hole refers to the area where the inner hole wall extends axially into the nut body 1, or the direction in which the lubricating oil flows out of the inner hole.

[0053] Preferably, the shaft assembly also includes a shim 10, which is connected to the retaining ring 9 and located between the housing 11 and the outer bearing 5, for use in conjunction with the locking plate 12 to radially limit the outer bearing 5; the baffle 103, the housing 11 and the outer shaft 3 form an outer oil passage, and the baffle 103 and the inner shaft 2 form an inner oil passage. The outer oil passage and the inner oil passage form a V-shaped structure when the device is in operation.

[0054] It should be noted that the shaft assembly of this application is composed of the aforementioned components, and the components work together to achieve locking, limiting, and lubrication functions. The nut body 1 is connected to the outer shaft 3 through the threaded part 101 to fix the overall structure; the outer ring of the nut body 1 has nested grooves 102 distributed circumferentially, which are used to cooperate with the locking plate 12 to achieve locking and limiting of the shaft body; a baffle 103 is provided on one side of the nut body 1, which separates the external space and forms an outer oil passage with the outer shell 11, and forms an inner oil passage with the inner shaft 2 and the inner shaft retaining ring 8, so as to achieve lubrication through the oil passage. The beveled surface 1031 on the baffle 103 is a controllable valve for lubricating oil to enter the inner passage from the outer passage, so as to control the flow direction and flow rate of the oil; wherein, the outer shell 11, as the outer static structure of the device, wraps and supports the internal rotating parts, and the inner sidewall of the outer shell 11 and the outer surface of the baffle 103 of the nut body 1 form an annular gap. Furthermore, the outer shaft 3 is threadedly connected to the nut body 1, serving as the main shaft component; the first boss 121 of the locking plate 12 engages with the outer shaft 3, restricting the radial displacement of the nut body 1 (i.e., restricting the rotation of the nut body 1); the second boss 122 of the locking plate 12 engages with the nesting groove 102, restricting the circumferential and axial displacement of the outer shaft 3 and the nut body 1, forming a mechanical limit, and adjusting the locking force by controlling the amount of displacement of the locking plate 12 on the outer shaft 3.

[0055] The assembly steps of the shaft system assembly in this application are as follows: First, the outer shaft 3 is pre-assembled by inserting it into the outer ring of the inner bearing 4 to ensure axial positioning. The positioning groove on the surface of the outer shaft 3 is aligned with the first boss 121 of the locking plate 12. Then, the locking plate 12 is installed by inserting the first boss 121 of the locking plate 12 into the inner ring of the outer shaft 3 from the positioning groove 31 and locking it in place. The nesting groove 102 of the nut body 1 engages with the second boss of the locking plate 12 to ensure that the axial displacement of the locking plate 12 is within a first preset range. Preferably, the first preset range is not less than 0.5 mm and not more than 1.0 mm. The threaded part 101 of the nut body 1 is threaded into the outer shaft 3 and screwed in for fixation. The contact surface between the nesting groove 102 and the locking plate 12 is checked to ensure that it is flat. Next, the inner bearing 4 is installed by pressing it between the inner shaft 2 and the outer shaft 3, ensuring the inner and outer rings are positioned and that the radial clearance between the inner bearing 4 and the outer shaft 3 is within a second preset range. Preferably, the second preset range is not less than 0.1 mm and not more than 0.3 mm. Then, the outer bearing 5 is installed inside the housing 11, matching the chamfered surface 1031 of the inner hole of the baffle 103. The axial clearance between the outer bearing 5 and the housing 11 is ensured to be within a third preset range. Preferably, the third preset range is not less than 0.2 mm and not more than 0.4 mm. Finally, the retaining ring 9 is assembled with the housing 11 by fitting the retaining ring 9 onto the outside of the housing 11 and connecting it to the housing 11 with screws, ensuring the sealing of the retaining ring 9 and the housing 11 to prevent oil leakage. During the installation phase, the entire device is installed onto the equipment body, which can be an engine. The outer shaft 3 is aligned with the equipment hole, and the engagement depth of the locking plate 12 and the outer shaft 3 is checked to prevent loosening. Lubricating oil is injected through the oil inlet 111 of the outer casing 11, so that the outer oil passage and the inner oil passage are supplied with oil synchronously. The lubricating oil flows evenly through the inner bearing 4 and the outer bearing 5 through the inner shaft 2 and the outer shaft 3, reducing friction loss and lowering the temperature of the device. After the preload of the nut body 1 is reached by rotating it, the nut is locked and the displacement of the locking piece 12 is kept stable through the thread engagement of the outer shaft 3. During the working stage, the displacement is controlled within the fifth preset range. The fourth preset range is not less than 80N and not more than 100N, and the fifth preset range is not more than 0.1mm.

[0056] Preferably, the distance between the bottom of the sharp corner of the beveled surface 1031 and the extension line of the oil inlet hole 111 of the outer casing 11 is not less than 0.1 mm and not more than 0.5 mm;

[0057] It should be noted that in this embodiment, the distance between the extension line of the oil inlet hole 111 of the outer shell 11 and the bottom of the sharp corner of the chamfered surface 1031 and the extension line of the oil inlet hole 111 is not less than 0.1mm and not more than 0.5mm. This ensures that during high-speed operation, the jet direction of the high-speed oil jet is directly opposite the bottom of the sharp corner of the chamfered surface 1031, allowing the oil to be precisely "projected" onto the designed guide surface of the chamfered surface 1031. This enables the oil to be efficiently captured and guided, and to flow smoothly along the V-shaped route formed by the outer oil passage and the inner oil passage to the inner and outer oil passages for lubricating internal components such as the inner bearing 4. Furthermore, with the precise spacing and the cooperation of the chamfered surface 1031 and the horizontal surface 1032, controllable micro-vortices may be generated near the sharp corner, further enhancing the sealing effect of the device and effectively preventing oil return.

[0058] Preferably, the distance between the bottom of the sharp corner of the beveled surface 1031 and the inner ring of the outer shaft 3 is not less than 2mm and not more than 3mm, so as to accurately control the oil flow rate of the inner oil passage between 0.1 and 0.3m / s. If the distance between the bottom of the sharp corner of the beveled surface 1031 and the inner ring of the outer shaft 3 is too small, for example, less than 2mm, the oil passage will be too narrow, which will restrict the flow of lubricating oil, resulting in local dry friction or uneven oil film, thereby reducing the bearing life. On the other hand, if the distance is too large, it will result in insufficient sealing and unnecessary vibration and noise during high-speed operation. In this embodiment, by controlling the sharp corner structure of the beveled surface 1031, the distance between the beveled surface 1031 and other components can be accurately controlled, which can avoid stress concentration in the sharp corner area and reduce fatigue damage caused by vibration or load. Furthermore, the sharp corner is located at the end of the nut body 1, forming a 45° inclined angle transition with the baffle 103. The length of the sharp corner is within the sixth preset range, and a horizontal surface 1032 is provided on the inner side of the inner hole of the baffle 103 to ensure a smooth transition when the oil flows from the baffle 103. The sixth preset range is not less than 1 mm and not more than 2 mm.

[0059] Furthermore, there are eight nested grooves 102. The depth of the nested grooves 102 is within a seventh preset range to ensure the stability of the nut during use and to prevent fatigue cracks caused by local stress concentration due to excessive groove depth, thereby improving the service life of the nut. The seventh preset range is not less than 3mm and not more than 6mm. The width of the nested grooves 102 is within an eighth preset range to ensure the ease of installation of the nut and to avoid the nut's strength decreasing due to excessively large groove openings, thereby improving the stability of the nut under stress. The eighth preset range is not less than 5mm and not more than 7mm. At the same time, the chamfer inside the nested grooves 102 is within a ninth preset range, which is not less than 0.5mm and not more than 1mm.

[0060] This application also provides a power unit, including the aforementioned nut or shaft assembly.

[0061] This application achieves multiple locking and limiting of the shaft body through the combination of nuts, locking plates, washers, inner shaft retaining rings, inner shaft washers, and outer shaft washers. This ensures that the inner shaft 2 and outer shaft 3, as well as the inner bearing 4 and outer bearing 5, remain locked and jointly limited axially and radially during device operation. The baffle structure of the nut body 1 forms inner and outer oil passages, realizing the functions of outer oil intake and inner oil blocking. This achieves a high degree of integration of locking, limiting, and lubrication control functions. Furthermore, it keeps the oil passages stable and dynamically balanced under the long-term high-speed rotation condition of 10,000 r / min, providing a more efficient and reliable solution for complex mechanical systems.

[0062] It should be noted that, in this document, 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 process, method, article, or apparatus.

[0063] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the method and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make various improvements, modifications, or variations without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the utility model concept and technical solution to other situations without modification, should all be considered as protected by this application.

Claims

1. A nut, characterized in that, Including the nut body, The inner ring of the nut body is provided with a threaded portion, which is used to connect with the component to be assembled by a thread. The outer circumferential ring of the nut body has nested grooves, which are used to cooperate with the threaded part to lock and limit the assembly of the component.

2. The nut according to claim 1, characterized in that, The nut also includes a baffle, which is located at one end of the nut body and has a ring-shaped structure.

3. The nut according to claim 2, characterized in that, The annular inner hole surface includes a beveled surface at a preset angle.

4. The nut according to claim 3, characterized in that, The inner surface of the baffle also includes a horizontal plane, the oblique surface is located outside the inner hole, and the horizontal plane is located inside the inner hole.

5. The nut according to claim 1, characterized in that, The nesting groove extends through the axial direction of the nut body.

6. A shaft assembly, characterized in that, The shaft system assembly includes: A nut, comprising a nut body; the inner ring of the nut body is provided with a threaded portion; the outer ring of the nut body is circumferentially distributed with nesting grooves; The shaft body has an external thread at one end for engaging with the threaded portion to restrict the axial movement of the shaft body; and the external thread of the shaft body has a positioning groove. The locking piece is a ring structure and is sleeved on the shaft body. The locking piece has a first boss and a second boss. The first boss cooperates with the positioning groove and the second boss cooperates with the nesting groove to restrict the circumferential movement of the shaft body.

7. The assembly according to claim 6, characterized in that, A locking plate track is provided at a position away from the end of the shaft body with external threads; The locking plate moves circumferentially along the locking plate track so that the second boss engages with the nesting groove.

8. The assembly according to claim 6, characterized in that, The shaft body includes an inner shaft and an outer shaft; The inner shaft is fitted with an inner bearing, and the inner shaft is along the axial direction of the nut body and passes through the nut body; The outer shaft is fitted with an outer bearing and is positioned between the inner bearing and the outer bearing; one end of the outer shaft is provided with an external thread for engaging with the threaded portion to restrict the axial movement of the outer shaft; the external thread of the outer shaft is provided with a positioning groove; the first boss engages with the positioning groove and the second boss engages with the nested groove to restrict the radial movement of the outer shaft.

9. The assembly according to claim 8, characterized in that, The assembly also includes a retaining ring and a housing; the nut also includes a baffle. The baffle is located at one end of the nut body, and the baffle is an annular structure; the inner surface of the annular hole includes a beveled surface with a preset angle; The retaining ring is a sleeve with an annular shaft cap at one end, and the retaining ring cooperates with the outer shell to fix the outer bearing; The outer casing is provided with an oil inlet hole at a preset angle, and the oil inlet hole and the inner hole form an oil passage.

10. A power unit comprising a nut as described in any one of claims 1 to 5 or a shaft assembly as described in any one of claims 6 to 9.

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