Locking and anti-loosening assembly for a hub bearing unit nut

Abstract

The application relates to the technical field of automobile bearing unit, in particular to a locking and anti-loosening assembly of a hub bearing unit nut, which comprises a locking nut, a snap ring and a wave-shaped elastic connecting piece, the snap ring is circumferentially uniformly distributed with a plurality of convex teeth, the locking nut is circumferentially uniformly distributed with a plurality of tooth-shaped plates, and the wave-shaped elastic connecting piece has a wave shape in the circumferential direction and is in an open loop structure. The wave-shaped elastic connecting piece connects the tooth-shaped plates on the locking nut and the convex teeth in a staggered buckle mode, limits the relative circumferential rotation of the locking nut and the snap ring, and realizes the anti-loosening effect of the locking nut. The locking nut of the hub bearing unit is anti-loosened, convenient to disassemble and assemble, can be disassembled and assembled multiple times and bearing clearance adjusted, is particularly suitable for the shaft end structure of the hub bearing unit of a medium or large-sized vehicle, the clearance can be accurately adjusted, and reliable anti-loosening performance can be ensured.

Description

Technical Field

[0001] This invention relates to the field of automotive bearing unit technology, and in particular to a locking and anti-loosening assembly for a wheel hub bearing unit nut. Background Technology

[0002] The automotive wheel hub bearing unit is an important rotating support component of the vehicle body. The main technologies of automotive wheel hub bearing units focus on: bearing technology, shaft end locking and anti-loosening technology, and lubrication and sealing technology. Among them, the bearing locking and anti-loosening structure plays a crucial role: (1) ensuring good and stable bearing clearance, which is conducive to maintaining bearing performance and service life; (2) preventing wheel and accessory failure caused by loose nuts and the resulting safety accidents. Therefore, the locking and anti-loosening structure is the most important key technology of wheel hub bearing unit components.

[0003] For automotive wheel hub bearing units, especially those used in medium and large vehicles, several well-known domestic and international companies possess key technologies. Currently, wheel hub bearing units for medium and large vehicles have evolved to the fourth generation of product technology, represented by ConMet in the United States. Previous generations of technology featured fixed internal clearance within the bearing unit, with the shaft end fixed structure not affecting the bearing clearance, and the bearings were non-standard components. ConMet's fourth-generation product technology achieves adjustable bearing clearance, greatly adapting to the needs of assembly applications, ensuring clearance adjustment after wear during application, maintaining the bearing in a slightly negative clearance operating state, and resulting in a longer lifespan and higher reliability for the wheel hub bearing unit. This detachable and adjustable nut locking and anti-loosening technology solves the problems of complex wheel hub structures, large sizes, and heavy weights, but requires more reliable nut locking in this wheel hub bearing unit to control clearance and prevent loosening.

[0004] The existing common shaft end locking structures include: (1) Snap ring locking structure, that is, the teeth on the inner side of the snap ring are locked in the groove on the shaft; the teeth on the outer side of the snap ring are plastically deformed and locked in the groove of the nut. This traditional structure has a good locking effect, but the disadvantages are that it is inconvenient to disassemble and assemble, there are few lockable phases, the clearance is inconvenient to adjust, and the snap ring is used only once; (2) Double nut locking structure, that is, there is mutual pressure between the two nuts to ensure that the threads do not loosen. Its disadvantages are that the structure is not compact, it is easy to loosen after high frequency vibration, and it is not easy to disassemble and assemble after corrosion; (3) Shaft end pin or wire locking structure, that is, a hole is opened on the shaft outside the nut to insert a pin or wire. Its disadvantages are that the locking position and bearing clearance cannot be adjusted, and the hole on the shaft can easily reduce the bearing capacity of the shaft. Therefore, in most cases, the commonly used nut locking and anti-loosening methods are not adopted in the vehicle wheel hub bearing unit under high load and complex alternating load conditions.

[0005] Solutions for locking and preventing loosening of nuts in wheel hub bearing units, both domestically and internationally, include: For example, the wheel hub bearing unit described in Chinese Patent Publication Nos. CN207989529U and CN211693224U, which uses a thin stamped outer sleeve to fix the shaft end retaining ring, thereby fixing the bearing's axial direction. This method results in a non-removable wheel hub bearing unit with non-adjustable clearance, making it suitable only for small vehicles and not large vehicles. For wheel hub bearing units in medium and large vehicles, there are four generations of technology. The first three generations are integral structures with non-adjustable clearance. The fourth generation offers performance advantages, featuring a detachable structure with adjustable clearance and reliable locking. ConMet, an American company specializing in fourth-generation technology, possesses a unique patented structure for bearing locking. ConMet's international patent publication number "EP2392477A2" describes a wheel hub bearing nut locking device. This device combines a hooked retaining ring, a grooved special nut, and a multi-hole chuck. When the nut is tightened to a suitable clearance adjustment position, the hook of the retaining ring passes through the nut and engages with the hole in the multi-hole chuck, thereby achieving locking and preventing loosening. This assembly consists of three components, each with a relatively complex structure and a complex installation process.

[0006] Therefore, the present invention proposes a locking and anti-loosening assembly for a wheel hub bearing unit nut, which has the advantages of convenient disassembly and assembly, compact structure, and good locking effect in high load-bearing vehicle wheel hub bearing units. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of this invention is to provide a locking and anti-loosening component for the nut of a wheel hub bearing unit. It has excellent anti-loosening performance, is easy to use, and can solve the problems of poor anti-loosening reliability and inability to be applied to working conditions with large loads and large vibrations in existing anti-loosening structures. It is also easy to disassemble and assemble, and can be disassembled and assembled and the bearing clearance can be adjusted multiple times. It is particularly suitable for the shaft end structure of the wheel hub bearing unit of medium and large vehicles. The clearance can be precisely adjusted and reliable anti-loosening performance can be guaranteed.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] On one hand, the present invention provides a locking and anti-loosening assembly for a wheel hub bearing unit nut, comprising a locking nut, a retaining ring, and a corrugated elastic connector; the retaining ring is connected to the main shaft by a key to achieve circumferential positioning of the retaining ring, the retaining ring is uniformly provided with a plurality of protruding teeth in the circumferential direction, and the locking nut is uniformly provided with a plurality of toothed plates in the circumferential direction; the corrugated elastic connector is an open-loop structure, the toothed plates and the protruding teeth are staggered, and the corrugated elastic connector is engaged with the outside of the locking nut and the retaining ring and respectively The toothed plates and the protruding teeth are alternately connected to restrict the circumferential rotation of the locking nut and the retaining ring; the number of protruding teeth is Z1, the number of toothed plates is Z2, the width of the protruding teeth is L1, the width of the toothed plates is L2, and Z2=Z1, L2=L1; the corrugated elastic connector includes Z1 sine waves, each sine wave including a crest and a trough, the width of the crest and the width of the trough are equal to the width of the protruding teeth; the outer diameter of the corrugated elastic connector is R. b The inner diameter is r b The height of the protruding tooth is h1, and the inner diameter of the retaining ring is r. k The inner diameter of the lock nut is r s And R b -r b ≤h1,r b ≥max(r) k r s );

[0010] The centerline of the outer surface of the corrugated elastic connector satisfies the following equation:

[0011] ;

[0012] Where t is the independent variable; x, y, and z are the coordinates of the function with respect to t, and the centerline of the outer surface of the wavy elastic connector is consistent with the curve of the function equation.

[0013] By adopting the above technical solution, the retaining ring and the main shaft are connected by a key to achieve circumferential limiting of the pull ring. The corrugated elastic connector connects the protruding teeth of the retaining ring and the toothed plate of the locking nut in an alternating manner, which restricts the circumferential movement of the locking nut and the retaining ring, improves the anti-loosening ability of the locking nut, ensures the axial preload of the locking nut, reduces the possibility of the locking nut rotating in the opposite direction and detaching from the main shaft under harsh working conditions, and improves the safety of the toothed retaining ring nut anti-loosening component.

[0014] The toothed plates and convex teeth have the same number, which facilitates manufacturing and processing. The toothed plates and convex teeth have the same width. That is, when the toothed plates and convex teeth are arranged in an alternating manner, the probability of relative sliding between the contact surfaces of the toothed plates and convex teeth is reduced, thereby improving the reliability of the locking nut in preventing loosening.

[0015] The corrugated elastic connector consists of Z1 crests and Z1 troughs. The width of the crests is the same as the width of the convex teeth. The fact that the crest width and trough width of the corrugated elastic connector are the same facilitates the processing and manufacturing of the corrugated elastic connector, reduces the possibility of relative sliding between the toothed plate and the convex tooth contact surface, avoids the reverse rotation of the lock nut, and improves the anti-loosening reliability of the lock nut.

[0016] The inner diameter r of the corrugated elastic connector b With the inner diameter r of the retaining ring k and lock nut r s The relationship between the inner diameters is: r b ≥max(r) k r s The inner diameter of the corrugated elastic connector is larger than the inner diameter of the retaining ring and the outer diameter of the locking nut, ensuring that the corrugated elastic connector can pass between the convex teeth and the toothed plate. The relationship between the height of the convex teeth and the outer and inner diameters of the corrugated elastic connector is: R b -r b ≤h1, so that the width of the corrugated elastic connector is less than the height of the tooth, thereby improving the reliability of the corrugated elastic connector.

[0017] Defining the centerline of the outer side of the corrugated elastic connector allows for better connection with the convex teeth and toothed plates, ensuring the reliability of the corrugated elastic connector and facilitating installation.

[0018] Preferably, the sides of the protruding teeth and the toothed plate are set as inclined surfaces, so that the corrugated elastic connector is tightly engaged with the protruding teeth and the toothed plate.

[0019] By adopting the above technical solution, the sides of the protruding teeth and the toothed plate are set as inclined surfaces, which allows the crests or troughs of the corrugated elastic connector to pass better between the protruding teeth and the toothed plate, and the engagement is more stable, increasing the reliability of the corrugated elastic connector.

[0020] Preferably, the upper or lower surface of the protruding tooth and the toothed plate is configured as an arc shape that matches the crest or trough of the corrugated elastic connector, so that the corrugated elastic connector is tightly engaged with the protruding tooth and the toothed plate.

[0021] By adopting the above technical solution, the adjacent protruding teeth and the upper or lower surface of the toothed plate can be further set as an arc shape that matches the crest or trough of the corrugated elastic connector. This setting can make the crest or trough of the arc perfectly fit with the arc-shaped surface, reducing the possibility of loosening.

[0022] Preferably, the corrugated elastic connector includes Z3 rectangular waves, and Z3 = Z1; the upper surface, lower surface and side surface of the protrusion and the toothed plate are all set as planes that match the rectangular waves of the corrugated elastic connector, so that the corrugated elastic connector is tightly engaged with the protrusion and the toothed plate.

[0023] By adopting the above technical solution, the corrugated elastic connector is a rectangular wave. The upper surface, lower surface, and side surface of the convex tooth and the toothed plate are all set as planes that match the rectangular wave of the corrugated elastic connector, so that the corrugated elastic connector abuts against the side surface of the toothed plate and the convex tooth. This results in a surface contact wave spring with strong shear resistance, improving the reliability of the locking nut in preventing loosening.

[0024] Preferably, the thickness of the corrugated elastic connector is T. b The distance from the crest to the mesosphere and the distance from the trough to the mesosphere are both H. z The thickness of the protruding tooth is T. t The thickness of the toothed plate is T. c And 2×H z ≥2×T t +T c +T b .

[0025] By adopting the above technical solution, it is ensured that the width of the convex teeth and toothed plates can be embedded in the crests and troughs of the waves.

[0026] Preferably, both sides of the toothed plate and the protruding tooth are provided with rounded corners.

[0027] By adopting the above technical solution, the chamfers of the toothed plate and the protruding teeth prevent people from being injured by the sharp edges when installing the corrugated elastic connector. On the other hand, it improves the smoothness of installation, shortens the installation time, and increases the installation efficiency.

[0028] Preferably, handles are provided at both ends of the opening of the corrugated elastic connector.

[0029] By adopting the above technical solution, handles are provided at both ends of the corrugated elastic connector, which facilitates installation and disassembly.

[0030] Preferably, the corrugated elastic connector has an elastic sleeve on its outer periphery, and the elastic sleeve abuts against the toothed plate and the toothed end face.

[0031] By adopting the above technical solution, the outer periphery of the corrugated elastic connector is provided with an elastic sleeve, which abuts against the toothed plate and the end face of the protruding tooth, avoiding rigid contact between the toothed plate, the protruding tooth and the corrugated elastic connector, reducing the vibration and noise generated during the operation of the toothed snap ring nut anti-loosening assembly. In addition, the elastic sleeve is a flexible component, which can compensate for the difference between the width of the toothed plate and the distance between adjacent toothed plates, improving the safety and reliability of the toothed snap ring nut anti-loosening assembly.

[0032] Preferably, the elastic sleeve is made of hydrogenated nitrile rubber.

[0033] By adopting the above technical solution, hydrogenated nitrile rubber has good compression resistance and tear resistance, which improves the service life of the toothed clasp nut anti-loosening assembly.

[0034] On the other hand, the present invention also provides a method for locking and preventing loosening of a hub bearing unit nut, which includes the following steps:

[0035] S1. Connect the retaining ring to the spindle via a key to achieve circumferential positioning of the retaining ring;

[0036] S2. The corrugated elastic connector is clamped outside the locking nut and the retaining ring, and is alternately connected to the toothed plate and the protruding tooth respectively, thereby restricting the circumferential rotation of the locking nut and the retaining ring.

[0037] In summary, the present invention has at least one of the following beneficial technical effects:

[0038] (1) The locking and anti-loosening assembly of the hub bearing unit nut of the present invention is designed to prevent loosening by combining the locking nut, the retaining ring, and the corrugated elastic connector. The corrugated elastic connector is in surface contact with the two sides of the tooth and the two sides of the tooth plate. The corrugated elastic connector restricts the relative rotation between the locking nut and the tooth outer edge fastening block. The retaining ring is connected to the main shaft by a key, which prevents the circumferential rotation of the retaining ring, thereby restricting the reverse rotation of the locking nut. This achieves the anti-loosening effect of the locking nut and avoids the risk of the locking nut loosening due to reverse rotation under vibration conditions.

[0039] (2) The present invention uses a corrugated elastic connector to connect the locking nut and the retaining ring to prevent the locking nut from loosening. The corrugated elastic connector connects the toothed plate and the protrusion in an alternating manner to restrict the circumferential rotation of the locking nut. Since the corrugated elastic connector is an open-loop design, the installation and removal of the protrusion and the toothed plate can be facilitated by pulling the corrugated elastic connector.

[0040] (3) The structure of the present invention is simple, and it is convenient to install, disassemble and maintain. No other tools are required to complete the installation and disassembly, which is convenient for installation and disassembly. Attached Figure Description

[0041] Figure 1This is a schematic diagram of the locking and anti-loosening assembly structure of the wheel hub bearing unit nut in Embodiment 1 of the present invention.

[0042] Figure 2 This is a schematic diagram of the retaining ring structure of Embodiment 1 of the present invention.

[0043] Figure 3 This is the present invention. Figure 2 The main view.

[0044] Figure 4 This is the present invention. Figure 2 Top view.

[0045] Figure 5 This is a schematic diagram of the locking nut structure of Embodiment 1 of the present invention.

[0046] Figure 6 This is the present invention. Figure 5 Top view.

[0047] Figure 7 This is the present invention. Figure 5 The main view.

[0048] Figure 8 This is a schematic diagram of the wavy elastic connector structure of Embodiment 1 of the present invention.

[0049] Figure 9 This is the present invention. Figure 8 Top view.

[0050] Figure 10 This is a partial schematic diagram of the unfolded wavy elastic connector in Embodiment 1 of the present invention.

[0051] Figure 11 This is a schematic diagram of the locking and anti-loosening assembly structure of the wheel hub bearing unit nut in Embodiment 2 of the present invention.

[0052] Figure 12 This is a schematic diagram of the wavy elastic connector structure of Embodiment 2 of the present invention.

[0053] Figure 13 This is a schematic diagram of the locking and anti-loosening assembly structure of the wheel hub bearing unit nut in Embodiment 3 of the present invention.

[0054] Figure 14 This is a schematic diagram of the wavy elastic connector structure of Embodiment 3 of the present invention.

[0055] Figure 15 This is a schematic diagram of the corrugated elastic connector with an elastic sleeve in Embodiment 4 of the present invention.

[0056] Figure 16 This is the present invention. Figure 15 Schematic diagram of the cross section along the AA direction.

[0057] Figure 17 This is the present invention. Figure 16 A magnified view of the X-axis.

[0058] The main reference numerals are as follows:

[0059] 1-Locking nut; 11-Mounting part; 111-Toothed plate; 12-Locking part; 2-Snap ring; 21-Inner protruding buckle; 22-Protruding tooth; 3-Wave elastic connector; 31-Crest; 32-Trough; 4-Elastic sleeve. Detailed Implementation

[0060] The following is in conjunction with the appendix Figure 1-17 The specific embodiments further illustrate the structure and working principle of the present invention in detail.

[0061] Example 1:

[0062] Embodiment 1 of the present invention discloses a locking and anti-loosening assembly for a hub bearing unit nut, such as... Figure 1 and Figure 2 As shown, the locking and anti-loosening assembly for the hub bearing unit nut includes a locking nut 1, a retaining ring 2, and a corrugated elastic connector 3. The retaining ring 2 is connected to the main shaft via a key to achieve circumferential limiting of the retaining ring. The locking nut 1 has several toothed plates 111 circumferentially, and the retaining ring 2 has several protruding teeth 22 circumferentially. The toothed plates 111 and protruding teeth 22 are staggered. The corrugated elastic connector 3 alternately connects the toothed plates 111 and protruding teeth 22, restricting the circumferential movement of the locking nut 1 and the retaining ring 2, improving the anti-loosening capability of the locking nut 1, ensuring the axial preload capability of the locking nut 1, reducing the possibility of the locking nut 1 rotating in the opposite direction and detaching from the main shaft under harsh working conditions, and improving the safety of the toothed retaining ring nut anti-loosening assembly application.

[0063] Specifically, such as Figure 2 , Figure 3 and Figure 4 As shown, the number of circumferential gear protrusions in the retaining ring 2 is Z1=8, and the protrusions 22 are evenly distributed on the outer circumference of the retaining ring 2. The inner circumference of the retaining ring 2 is provided with an inner protrusion buckle 21, which is embedded in the keyway of the spindle (not shown in the figure) to achieve circumferential positioning of the retaining ring 2. The width of the protrusion 22 is B. t The circumferential radius of the clasp is r. k The thickness T of the convex tooth 22 t The height h1 of the convex tooth 22.

[0064] like Figure 3 , Figure 5 and Figure 6 As shown, the locking nut 1 includes a mounting part 11 and a locking part 12. The toothed plate 111 is disposed in the circumference of the mounting part 11. The number of toothed plates 111 is Z2=8, and they are evenly distributed in the circumference of the mounting part 11. The number of toothed plates 111 and the number of protruding teeth 22 are the same, which facilitates manufacturing and assembly.

[0065] like Figure 7 As shown, the end face of the toothed plate 111 on the side away from the locking part 12 is flush with the end face of the mounting part 11, and the width of the toothed plate 111 is B. c The thickness T of the toothed plate 111 c The radius of the locking nut 1 is r. s .

[0066] like Figure 4 and Figure 7 As shown, the width of the toothed plate 111 is B. c The width of the convex tooth 22 is B t The relationship between the two is: B c =B t When the toothed plate 111 and the protruding tooth 22 are arranged in an alternating manner, the probability of relative sliding between the contact surfaces of the toothed plate 111 and the protruding tooth 22 is reduced, thereby improving the reliability of the locking nut 1 in preventing loosening.

[0067] The relationship between the radius of the locking nut 1 and the radius of the retaining ring 2 is: r s =r k The relationship between the thickness of the toothed plate 111 and the thickness of the protruding tooth 22 is: T c =T t .

[0068] To improve installation smoothness, shorten installation time, and increase installation efficiency, both the toothed plate 111 and the protruding teeth 22 have rounded corners on their outer periphery, which also reduces the possibility of injury from sharp edges when installing the corrugated elastic connector 3. The sides of the toothed plate 111 and the protruding teeth 22 are beveled and have rounded corners, which makes it easier to install the corrugated elastic connector 3 and allows for a tighter engagement with it.

[0069] like Figure 8 , Figure 9 and Figure 10 As shown, the corrugated elastic connector 3 is an open-loop structure with handles at both ends for easy installation and disassembly. When unfolded, the corrugated elastic connector is a sine wave, consisting of Z1=8 peaks 31 and 8 troughs 32.

[0070] The width B at half height of the middle layer of wave crest 31 f The width B at half the height of the mid-level of wave trough 32 g The width B of the convex tooth 22 t The width of the toothed plate 111 is B c The relationship is: B f =B g =B t =B cThe corrugated elastic connector 3 has the same size crest 31 and trough 32, which facilitates the processing and manufacturing of the corrugated elastic connector 3, reduces the possibility of relative sliding between the toothed plate 111 and the toothed 22, avoids the reverse rotation of the locking nut 1, and improves the anti-loosening reliability of the locking nut 1.

[0071] The outer diameter R of the corrugated elastic connector 3 b Inner diameter r b The relationship between the height of the convex tooth 22 and the outer and inner diameters of the corrugated elastic connector 3 is: R b -r b ≤h1, inner diameter r of the corrugated elastic connector 3 b With the inner diameter r of the retaining ring 2 k and the inner diameter r of the lock nut 1 s The relationship between the three is: r b ≥max(r) k r s ).

[0072] The inner diameter of the corrugated elastic connector 3 is larger than the inner diameter of the retaining ring 2 and the outer diameter of the locking nut 1, ensuring that the corrugated elastic connector 3 can pass between the protruding tooth 22 and the toothed plate 111. The relationship between the height of the protruding tooth 22 and the outer and inner diameters of the corrugated elastic connector 3 is: R b -r b The width of the corrugated elastic connector 3 is less than the height of the tooth 22, thus improving the reliability of the corrugated elastic connector 3.

[0073] The thickness of the corrugated elastic connector 3 is T. b The distance from peak 31 to the mesosphere and the distance from trough 32 to the mesosphere are both H. z The thickness of the protrusion 22 is T. t The thickness of the toothed plate 111 is T. c The relationship between the thickness of the corrugated elastic connector 3, the distance from the crests 31 and troughs 32 to the middle layer, and the thickness of the tooth 22 is: 2×H z ≥2×T t +T c +T b This ensures that the thickness of the protruding teeth 22 and the toothed plate 111 can be embedded in the crests 31 and troughs 32.

[0074] The centerline of the outer surface of the corrugated elastic connector satisfies the following equation:

[0075] ;

[0076] Where t is the independent variable; x, y, and z are the coordinates of the function with respect to t, and the centerline of the outer surface of the wavy elastic connector is consistent with the curve of the function equation.

[0077] Example 2:

[0078] Embodiment 2 of the present invention discloses a locking and anti-loosening assembly for a wheel hub bearing unit nut, such as... Figure 11 and Figure 12 As shown, the connection point between the corrugated elastic connector 3 and the toothed plate 111 and the protruding tooth 22, i.e., the upper or lower surface, is a continuous arc surface. As can be seen in the figure, its shape perfectly matches the crests or troughs of the corrugated elastic connector 3. The contact position between the corrugated elastic connector and the toothed plate 111 or the protruding tooth 22 can perfectly fit, increasing the contact area and improving the anti-loosening effect. The remaining structure is the same as that of Embodiment 1.

[0079] Example 3:

[0080] Embodiment 3 of the present invention discloses a locking and anti-loosening assembly for a wheel hub bearing unit nut. In this embodiment, as shown... Figure 13 and Figure 14 As shown, the unfolded shape of the corrugated elastic connector 3 consists of eight rectangular waves. The corrugated elastic connector 3 abuts against the sides of the toothed plate 111 and the protruding teeth 22 in surface contact, and has rounded chamfers on the sides. The corrugated elastic connector 3 has strong shear resistance, improving the reliability of the locking nut 1 in preventing loosening. The rest of the structure is the same as that in Embodiment 1.

[0081] Example 4:

[0082] Embodiment 4 of the present invention discloses a locking and anti-loosening assembly for a wheel hub bearing unit nut. In this embodiment, as shown... Figure 15 , Figure 16 and Figure 17 As shown, the outer periphery of the corrugated elastic connector 3 is provided with an elastic sleeve 4. The elastic sleeve 4 abuts against the end face of the toothed plate 111 and the protruding tooth 22, avoiding rigid contact between the toothed plate 111, the protruding tooth 22 and the corrugated elastic connector 3, reducing the vibration and noise generated during the operation of the toothed snap ring 2 nut anti-loosening assembly, and improving the safety and reliability of the toothed snap ring 2 nut anti-loosening assembly.

[0083] Furthermore, the elastic sleeve 4 is a flexible component made of hydrogenated nitrile butadiene rubber. Hydrogenated nitrile butadiene rubber has excellent compression and tear resistance, which on the one hand improves the service life of the toothed clasp 2 nut anti-loosening assembly, and on the other hand compensates for the difference between the width of the toothed plate 111 and the distance between adjacent toothed plates 111, thus improving the safety and reliability of the toothed clasp 2 nut anti-loosening assembly. The remaining structure is the same as in Embodiment 1.

[0084] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A locking and anti-loosening assembly for a hub bearing unit nut, characterized in that: It includes a lock nut (1), a retaining ring (2), and a corrugated elastic connector (3); The retaining ring (2) is connected to the main shaft by a key to achieve circumferential positioning of the retaining ring (2). The retaining ring (2) is uniformly provided with several protruding teeth (22) in the circumferential direction, and the locking nut (1) is uniformly provided with several toothed plates (111) in the circumferential direction. The corrugated elastic connector (3) has an open-loop structure. The toothed plate (111) and the protruding teeth (22) are staggered. The corrugated elastic connector (3) is locked outside the locking nut (1) and the retaining ring (2) and is alternately connected to the toothed plate (111) and the protruding teeth (22) respectively, thereby restricting the circumferential rotation of the locking nut (1) and the retaining ring (2). The number of the protruding teeth (22) is Z1, the number of the toothed plates (111) is Z2, the width of the protruding teeth (22) is L1, the width of the toothed plates (111) is L2, and Z2=Z1, L2=L1; The corrugated elastic connector (3) includes Z1 sine waves, each sine wave including a peak (31) and a trough (32), the width of the peak (31) and the width of the trough (32) are equal to the width of the tooth (22); The outer diameter of the corrugated elastic connector (3) is R. b The inner diameter is r b The height of the protruding tooth (22) is h1, and the inner diameter of the retaining ring (2) is r. k The inner diameter of the locking nut (1) is r s And R b -r b ≤h1,r b ≥max(r) k r s ); The centerline of the outer surface of the corrugated elastic connector satisfies the following equation: ； Where t is the independent variable; x, y, and z are the coordinates of the function with respect to t, respectively. The centerline of the outer surface of the corrugated elastic connector is consistent with the curve of the function equation. The distance from the crest (31) to the middle layer and the distance from the trough (32) to the middle layer are both H. z .

2. The locking and anti-loosening assembly for a hub bearing unit nut according to claim 1, characterized in that: The sides of the protruding teeth (22) and the toothed plate (111) are set as inclined surfaces, so that the wavy elastic connector (3) is tightly engaged with the protruding teeth (22) and the toothed plate (111).

3. The locking and anti-loosening assembly for a hub bearing unit nut according to claim 1, characterized in that: The upper or lower surface of the protruding tooth (22) and the toothed plate (111) is set to an arc shape that matches the crest or trough of the corrugated elastic connector (3), so that the corrugated elastic connector (3) is tightly engaged with the protruding tooth (22) and the toothed plate (111).

4. The locking and anti-loosening assembly for a hub bearing unit nut according to claim 1, characterized in that: The thickness of the corrugated elastic connector (3) is T. b The distance from the crest (31) to the mesosphere and the distance from the trough (32) to the mesosphere are both H. z The thickness of the convex tooth (22) is T. t The thickness of the toothed plate (111) is T. c And 2×H z ≥2×T t +T c +T b .

5. A locking and anti-loosening assembly for a hub bearing unit nut, characterized in that: It includes a lock nut (1), a retaining ring (2), and a corrugated elastic connector (3); The retaining ring (2) is connected to the main shaft by a key to achieve circumferential positioning of the retaining ring (2). The retaining ring (2) is uniformly provided with several protruding teeth (22) in the circumferential direction, and the locking nut (1) is uniformly provided with several toothed plates (111) in the circumferential direction. The corrugated elastic connector (3) has an open-loop structure. The toothed plate (111) and the protruding teeth (22) are staggered. The corrugated elastic connector (3) is locked outside the locking nut (1) and the retaining ring (2) and is alternately connected to the toothed plate (111) and the protruding teeth (22) respectively, thereby restricting the circumferential rotation of the locking nut (1) and the retaining ring (2). The number of the protruding teeth (22) is Z1, the number of the toothed plates (111) is Z2, the width of the protruding teeth (22) is L1, the width of the toothed plates (111) is L2, and Z2=Z1, L2=L1; The corrugated elastic connector (3) includes Z3 rectangular waves, and Z3 = Z1; the upper surface, lower surface and side surface of the protruding tooth (22) and the toothed plate (111) are all set as planes that match the rectangular waves of the corrugated elastic connector (3), so that the corrugated elastic connector (3) is tightly engaged with the protruding tooth (22) and the toothed plate (111).

6. A locking and anti-loosening assembly for a hub bearing unit nut according to claim 1 or 5, characterized in that: The sides of the protruding teeth (22) and the toothed plate (111) are provided with rounded chamfers.

7. A locking and anti-loosening assembly for a hub bearing unit nut according to claim 1 or 5, characterized in that: The two ends of the opening of the corrugated elastic connector (3) are provided with handles.

8. A locking and anti-loosening assembly for a hub bearing unit nut according to claim 1 or 5, characterized in that: The outer periphery of the corrugated elastic connector (3) is provided with an elastic sleeve (4), which abuts against the toothed plate (111) and the end face of the protruding tooth (22).

9. The locking and anti-loosening assembly for a hub bearing unit nut according to claim 8, characterized in that: The elastic sleeve (4) is made of hydrogenated nitrile rubber.

10. A method for locking and preventing loosening of the wheel hub bearing unit nut based on the locking and anti-loosening assembly of the wheel hub bearing unit nut according to claim 1 or 5, characterized in that: It includes the following steps: S1. Connect the retaining ring (2) to the spindle via a key to achieve circumferential positioning of the retaining ring (2); S2. The corrugated elastic connector (3) is clamped outside the locking nut (1) and the retaining ring (2), and is alternately connected to the toothed plate (111) and the protruding tooth (22) respectively, thereby restricting the circumferential rotation of the locking nut (1) and the retaining ring (2).

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