Looseness prevention structure of output flange locking nut

Abstract

The invention provides an output flange locking nut anti-loosening structure which prevents rotation of a locking nut and ensures stable power output of a gearbox output flange. The output shaft comprises a shaft body and a convex locking stud, and the inner end of the locking stud is provided with a stop ring edge which is arranged in a radial extension mode; the locking nut comprises an internal threaded hole, a regular polygon head and a pressing end, the internal threaded hole is formed in the position of a center hole of the locking nut, the regular polygon head is arranged on the outer circumference of the locking nut, and the pressing end is arranged at the position, facing the stop ring edge of the output shaft, of the locking nut; the output flange comprises a sleeve part and a flange ring part, the sleeve part comprises an axial inner end fixing sleeve part and an axial outer end locking sleeve part, and an inner cavity of the axial outer end locking sleeve part is used for locking a locking nut; and a plurality of locking teeth are annularly distributed on the inner ring of the locking ring.

Description

Technical Field

[0001] This invention relates to the technical field of anti-loosening structures, specifically an anti-loosening structure for output flange locking nuts. Background Technology

[0002] High-torque gearboxes are frequently used in heavy-duty trucks and tractors. The output flange of these gearboxes connects to the drive shaft. Under harsh operating conditions, the drive shaft exerts strong vibrations and axial impacts on the gearbox output flange. Combined with the high torque under heavy loads, the output shaft of the gearbox bears a large alternating torque, causing lateral micro-vibrations in the output flange. This leads to slight relative slippage between the threads, eventually causing the nut to gradually rotate and loosen. Current nylon nut anti-loosening methods and adhesive coatings can provide some anti-loosening effect by increasing the thread preload and prolonging the time before the nut loosens. However, with the passage of time and increasing the severity of operating conditions, nut loosening is unavoidable. Therefore, there is an urgent need to develop an anti-loosening structure that can fundamentally solve the problem of nut loosening. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides an anti-loosening structure for the output flange locking nut, which prevents the locking nut from rotating and ensures stable power output from the gearbox output flange.

[0004] An anti-loosening structure for an output flange locking nut, characterized in that it comprises: The output shaft includes a shaft body and an outwardly protruding locking stud, the inner end of which is provided with a radially extending stop ring edge. A locking nut includes an internal threaded hole, a regular polygonal head, and a pressing end. The locking nut has an internal threaded hole at its center, a regular polygonal head at its outer circumference, and a pressing end at its stop ring edge facing the output shaft. The output flange includes a sleeve portion and a flange ring portion. The sleeve portion includes an axial inner end fixed sleeve portion and an axial outer end locking sleeve portion. The inner cavity of the axial outer end locking sleeve portion is used for locking the nut. And a locking ring, the inner ring of which is provided with several locking teeth; The output shaft body has an axial inner end fixed sleeve portion of the output flange fixedly sleeved at its end. The internal thread hole of the locking nut is threadedly connected to the locking stud. The pressing end of the locking nut presses against the inner end stop ring edge of the axial outer end locking sleeve. The locking ring is fitted onto the outer periphery of the head of the regular polygon, and the corresponding locking teeth engage with the intersecting angle formed by the adjacent sides of the regular polygon. The locking ring is fixedly installed at the corresponding positions of the output shaft and the output flange.

[0005] Its further features are: The outer ring of the locking ring is provided with at least one side protruding handle, and the inner ring wall of the flange ring cloth of the output flange is provided with a corresponding number of locking notches. The side protruding handle of the locking ring is embedded in the corresponding locking notch, thereby completing the circumferential locking of the locking ring. It also includes a pressure plate and a locking bolt. The pressure plate is pressed onto the exposed surface of the locking ring. The center of the pressure plate is provided with a through hole. The exposed center of the locking stud is provided with a locking threaded hole. The locking bolt passes through the through hole of the pressure plate and is threaded into the locking threaded hole. The pressure plate also includes a pressure head with a downward protrusion on its outer periphery. In the locked state, the lower surface of the locking ring is in close contact with the bottom surface of the locking notch; Preferably, the outer ring of the locking ring is provided with side protruding handles at both ends corresponding to the same diameter, and the inner ring wall of the output flange is provided with two sets of corresponding locking notches. The corresponding side protruding handles of the locking ring are embedded in the locking notches to complete reliable circumferential locking. To facilitate the assembly of the locking ring, the width of the locking notch is slightly larger than the width of the side protrusion handle, which allows the locking ring to have a small angular rotation space to adapt to the intersection angle of the regular polygon head. After the adaptation is in place, the locking bolt locks the pressure plate, and then Wanheng locks the locking ring axially and axially. The pressure plate includes a central circle and pressure strips protruding on both sides of the same radial direction. Each pressure strip has a pressure head that is bent downwards at its radial end. The axial position of the pressure plate is mainly positioned by the lower end face of the central circle and the end face of the output shaft. The two are in contact with each other. There is a certain gap between the pressure head and the locking ring. The pressure ring also has the function of preventing the locking ring from coming out. Preferably, the polygonal head of the locking nut is a regular hexagonal head, which makes it more versatile; The inner ring of the locking ring has 6N sets of locking teeth, where N is a natural number; Preferably, the number of locking teeth is 36.

[0006] After adopting the above technical solution, the locking ring is fitted onto the polygonal head of the locking nut to prevent relative rotation between the locking nut and the locking ring. At the same time, the locking nut is fixedly installed at the corresponding position of the output shaft and the output flange, restricting relative rotation between the locking ring and the flange. Meanwhile, the end of the output shaft body is fixedly fitted with the axial inner end fixed sleeve of the output flange and does not rotate. Therefore, the locking nut and the output shaft do not rotate relative to each other, thus achieving the anti-loosening function. It prevents the rotation of the locking nut and ensures stable power output from the gearbox output flange. Attached Figure Description

[0007] Figure 1 This is a sectional view of the existing technology's output shaft and output flange installation. Figure 2 This is a cross-sectional view showing the installation of the output shaft and output flange of the present invention. Figure 3 This is a top view schematic diagram of the locking principle of the present invention; Figure 4 This is a top view schematic diagram of the assembly of the locking ring and the output flange of the present invention; The names corresponding to the serial numbers in the diagram are as follows: Output shaft 10, shaft body 11, locking stud 12, locking threaded hole 121, stop ring edge 13, locking nut 20, internal threaded hole 21, regular polygonal head 22, pressing end 23, output flange 30, locking notch 301, sleeve part 31, axial inner end fixed sleeve part 311, axial outer end locking sleeve part 312, inner end stop ring edge 313, flange ring part 32, locking ring 40, locking tooth 41, side protruding handle 42, pressure plate 50, center circle 51, through hole 511, pressure strip 52, pressure head 521, locking bolt 60. Detailed Implementation

[0008] An anti-loosening structure for output flange locking nuts, see Figures 2-4 It includes an output shaft 10, a locking nut 20, an output flange 30, a locking ring 40, a pressure plate 50, and a locking bolt 60; The output shaft 10 includes a shaft body 11 and an outwardly protruding locking stud 12. The inner end of the locking stud 12 is provided with a radially extended stop ring edge 13. The locking nut 20 includes an internal threaded hole 21, a regular polygonal head 22, and a pressing end 23. The locking nut 20 has an internal threaded hole 21 at its center, a regular polygonal head 22 at its outer circumference, and a pressing end 23 at its position facing the stop ring edge 13 of the output shaft 10. The output flange 30 includes a sleeve portion 31 and a flange ring portion 32. The sleeve portion 31 includes an axial inner end fixed sleeve portion 311 and an axial outer end locking sleeve portion 312. The inner cavity of the axial outer end locking sleeve portion 312 is used for locking the nut 20. The inner ring of the locking ring 40 has a number of locking teeth 41. The output shaft 10 has an axial inner end sleeve 311 of the output flange 30 fixedly sleeved at the end of the shaft body 11. In a specific embodiment, it is assembled with a spline fit. The internal threaded hole 21 of the locking nut 20 is threadedly connected to the locking stud 12. The pressing end 23 of the locking nut 20 presses against the inner end stop ring edge 313 of the axial outer end locking sleeve 312. The locking ring 40 is fitted on the outer periphery of the regular polygon head 22, and the corresponding locking teeth 41 engage with the intersecting angle formed by the adjacent sides of the regular polygon. The locking ring 40 is fixedly installed at the corresponding positions of the output shaft 10 and the output flange 30.

[0009] In a specific embodiment, the outer ring of the locking ring 40 is provided with side protruding handles 42 at both ends of the same diameter, and the inner ring wall of the output flange 30 is provided with two sets of corresponding locking notches 301. The corresponding side protruding handles 42 of the locking ring 40 are embedded in the locking notches 301 to complete reliable circumferential locking. The pressure plate 50 is press-fitted onto the exposed surface of the locking ring 40. The pressure plate 50 includes a central circle 51 and pressure strips 52 protruding from both sides in the same radial direction. Each pressure strip 52 has a pressure head 521 for downward bending at its radial end. A through hole 511 is provided in the center of the central circle 51. The exposed center of the locking stud 12 is recessed with a locking threaded hole 121. The locking bolt 60 passes through the through hole 511 of the pressure plate 50 and is threaded to the locking threaded hole 121. At this time, the two sets of pressure heads 521 leave gaps with the corresponding end faces of the locking ring 40. The pressure head 521 is used to reliably limit the locking ring 40 and prevent the locking ring 40 from coming out.

[0010] To facilitate the assembly of the locking ring 40, the width of the locking notch 301 is slightly larger than the width of the side protruding handle 42, which allows the locking ring 40 to have a small angular rotation space to adapt to the intersection angle of the regular polygon head 22. After the adaptation is in place, the locking bolt 60 locks the pressure plate 50, thereby completing the axial and axial locking of the locking ring 40.

[0011] In a specific embodiment, the polygonal head 22 of the locking nut 20 is a regular hexagonal head, which makes it more versatile, and the number of locking teeth on the inner ring of the locking ring 40 is 36 or 72.

[0012] The preferred number of locking teeth 41 is 36; the test results of 72 teeth showed that the breaking torque was relatively small, at 150 N·m, while the breaking torque of 36 teeth could reach 600 N·m, and it could also be easily installed, so 36 teeth were chosen.

[0013] The locking ring is fitted onto the polygonal head of the locking nut to prevent relative rotation between the locking nut and the locking ring. Simultaneously, the locking nut is fixed to the corresponding positions on the output shaft and output flange via a pressure plate and locking bolts, restricting relative rotation between the locking ring and the flange. Furthermore, the end of the output shaft body is fixed to the axial inner end of the output flange via a spline structure, preventing rotation. Therefore, the locking nut and output shaft do not rotate relative to each other, thus achieving the anti-loosening effect. This prevents the locking nut from rotating, ensuring stable power output from the gearbox output flange.

[0014] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0015] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A locking nut anti-loosening structure for an output flange, characterized in that, It includes: The output shaft includes a shaft body and an outwardly protruding locking stud, the inner end of which is provided with a radially extending stop ring edge. A locking nut includes an internal threaded hole, a regular polygonal head, and a pressing end. The locking nut has an internal threaded hole at its center, a regular polygonal head at its outer circumference, and a pressing end at its stop ring edge facing the output shaft. The output flange includes a sleeve portion and a flange ring portion. The sleeve portion includes an axial inner end fixed sleeve portion and an axial outer end locking sleeve portion. The inner cavity of the axial outer end locking sleeve portion is used for locking the nut. And a locking ring, the inner ring of which is provided with several locking teeth; The output shaft body has an axial inner end fixed sleeve portion of the output flange fixedly sleeved at its end. The internal thread hole of the locking nut is threadedly connected to the locking stud. The pressing end of the locking nut presses against the inner end stop ring edge of the axial outer end locking sleeve. The locking ring is fitted onto the outer periphery of the head of the regular polygon, and the corresponding locking teeth engage with the intersecting angle formed by the adjacent sides of the regular polygon. The locking ring is fixedly installed at the corresponding positions of the output shaft and the output flange.

2. The anti-loosening structure for the output flange locking nut according to claim 1, characterized in that: The outer ring of the locking ring is provided with at least one side protruding handle, and the inner ring wall of the flange ring cloth of the output flange is provided with a corresponding number of locking notches, and the side protruding handle of the locking ring is embedded in the corresponding locking notch.

3. The anti-loosening structure for the output flange locking nut according to claim 2, characterized in that: It also includes a pressure plate and a locking bolt. The pressure plate is pressed onto the exposed surface of the locking ring. The pressure plate is also provided with a through hole in the center. The exposed center of the locking stud is provided with a locking threaded hole. The locking bolt passes through the through hole of the pressure plate and is threaded into the locking threaded hole. The pressure plate also includes a pressure head with a downward protrusion on its outer periphery.

4. The anti-loosening structure for the output flange locking nut according to claim 3, characterized in that: In the locked state, the lower surface of the locking ring is in close contact with the bottom surface of the locking notch.

5. The anti-loosening structure for the output flange locking nut according to claim 2, characterized in that: The outer ring of the locking ring is provided with side protrusion handles at both ends corresponding to the same diameter. The inner ring wall of the output flange is provided with two sets of corresponding locking notches, and the corresponding side protrusion handles of the locking ring are embedded in the locking notches.

6. The anti-loosening structure for the output flange locking nut according to claim 2, characterized in that: The width of the locking notch is slightly larger than the width of the side handle.

7. The anti-loosening structure for the output flange locking nut according to claim 3, characterized in that: The pressure plate includes a central circle and pressure strips protruding on both sides of the same radial direction. Each set of pressure strips has a pressure head for downward bending at its radial end.

8. The anti-loosening structure for the output flange locking nut according to claim 1, characterized in that: The locking nut has a regular polygonal head that is a regular hexagonal head.

9. The anti-loosening structure for the output flange locking nut according to claim 8, characterized in that: The inner ring of the locking ring has 6N sets of locking teeth, where N is a natural number.

10. The anti-loosening structure for the output flange locking nut according to claim 8, characterized in that: The number of locking teeth is 36.

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