CN217455499U - Wheel center trim cover positioning structure - Google Patents

Abstract

The utility model relates to a central trim cover location structure of wheel, location structure circumference distributes in the inner face of the central trim cover of wheel, and the primary structure includes the bayonet socket. The buckle is divided into two parts, wherein one side facing the outer edge of the wheel is of a cavity structure, a pair of positioning structure supporting ribs is arranged in the direction perpendicular to the connecting line of the center of the wheel center decorative cover and the center of the wheel hub, a semi-surrounding bayonet is arranged on the other side opposite to the cavity structure, an inverted buckle is arranged at the top end of the semi-surrounding bayonet, and the inverted buckle is buckled with the nut inclined plane of the hub nut. The buckle is also provided with a reinforcing structure for shortening the force arm of the falling force of the wheel center decorative cover relative to the periphery of the wheel hub bolt or nut. By adopting the design, the wheel center decorative cover can be arranged on the standard hub bolt, the force arm influencing the falling force of the wheel center decorative cover is shortened under the condition of not changing the mounting force and the dismounting force of the center decorative cover, the falling force of the decorative cover is effectively increased, the factory requirement is met, and the qualification rate is improved.

Description

Wheel center trim cover positioning structure

Technical Field

The utility model belongs to the technical field of auto wheel spare part, especially relate to a wheel center trim cover location structure.

Background

For more than 30 years, the use of plastics in automobiles has increased. At present, the usage amount of the automobile plastic in industrially developed countries accounts for 8% -10% of the total consumption amount of the plastic. From the perspective of materials used in modern automobiles, shadows made of plastic can be seen everywhere, whether as exterior trim, interior trim, or functional and structural parts.

The wheel center trim cover is an ornament for shielding a rim. The wheel center trim cover is located in a conspicuous position outside the vehicle and is an important exterior trim. The high-quality decorative covers have different shapes and exquisite appearances, and can be mounted on the wheels to achieve the effect of drying the shape of the whole vehicle, so that the whole vehicle body is more beautiful. The wheel center decorative cover mostly adopts the front installation, adopts the form of buckle to fix the decorative cover on the wheel hub nut promptly, looks more pleasing to the eye, and plays rust-resistant waterproof effect to the wheel hub bolt, if the bolt rusts then can cause the tire assembly to dismantle the difficulty.

In urban traffic, under the condition that vehicles and pedestrians are more, the wheel center decorative cover falling due to the fact that the falling force does not reach the standard is prone to damaging other vehicles or pedestrians, and the consequence is not reasonable. Therefore, the industry has a unified wheel trim cover fixing force test standard, and the specific operation is as follows: the wheel decorative cover is arranged on the corresponding wheel, a heavy object with the same mass as the wheel decorative cover to be detected is arranged outside the wheel decorative cover, the wheel is lifted to 1.8m high and then falls freely, and if the wheel decorative cover falls off, the wheel decorative cover fails.

The design of the wheel center trim cover in the prior art usually adopts a buckle structure, and the wheel center trim cover and a positioning platform surface of a hub nut are clamped by the buckle structure to improve the dropping force. However, due to the problems of design, manufacturing process and the like, the installation is not firm, the shaking abnormal sound can be generated when the design gap is too large, and the clamping can not be achieved easily due to the tolerance when the design gap is too small. Therefore, the situation that the falling force test of the wheel center decorative cover of the buckle structure does not reach the standard often occurs, the design also has requirements on the structure of the hub nut, the type selection of the hub nut is limited, and the economic benefit is influenced. As shown in fig. 1, the hub nut standard component applied to a wheel hub bolt includes a nut inclined surface, a nut hexagonal surface and a nut supporting surface. The standard nuts do not comprise a special positioning platform surface, so that the positioning difficulty is high through a common buckling structure, and the wheel center trim cover is usually dropped and unqualified in a free falling body with the height of 1.5m in a fixing force test. However, compared with the standard nut, the customized nut has small yield, complex structure and higher price, so that the positioning structure of the wheel center trim cover needs to be further improved, the anti-falling force is effectively increased when the hub nut without a specially-made positioning platform surface is used, and the qualified rate of finished products is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a wheel center trim cover location structure is provided, avoid the structural requirement to the location platform of wheel hub nut, practice thrift the cost, promote economic benefits.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a central trim cover location structure of wheel, location structure circumference distributes in the inner face of the central trim cover of wheel, location structure's quantity and relative position and the hub bolt one-to-one on the central trim cover wheel of waiting to install, location structure includes the bayonet socket, its characterized in that, the bayonet socket includes two parts, and wherein one side towards the wheel outer fringe is the cavity structure, is equipped with a pair of location structure brace rod in the direction of perpendicular to wheel center trim cover rotation center and wheel hub center line of continuity, and the opposite side of relative cavity structure is the semi-surrounding bayonet socket, the top of semi-surrounding bayonet socket is equipped with the back-off, the nut inclined plane lock of back-off and wheel hub nut, the back of semi-surrounding bayonet socket is equipped with several fore-and-aft bayonet socket brace rods, be equipped with the bayonet socket groove between cavity structure and the semi-surrounding bayonet socket, the bayonet socket still is equipped with the arm that is used for shortening the central trim cover power of droing in wheel in the periphery of wheel hub bolt or wheel hub nut And (4) reinforcing the structure.

Further, the reinforcing structure comprises a plurality of transverse annular ribs arranged at the upper end area of the semi-surrounding bayonet and a plurality of longitudinal support ribs arranged at the lower end area of the semi-surrounding bayonet.

Furthermore, the number of the transverse annular ribs is five, and the number of the longitudinal support ribs is three.

Furthermore, the root and one side of each nut support rib of the reinforcing structure are fixed on the semi-surrounding bayonet, the other side of each nut support rib is suspended, and a sawtooth structure in threaded fit with the hub bolt is arranged at the top end of each nut support rib.

Further, the serrations are configured as inverted serrations that facilitate insertion of the hub bolts.

Further, the reinforcing structure comprises a metal buckle arranged above the cavity structure, and the metal buckle comprises a semicircular arc part and a fixed folding part.

Furthermore, the fixing folding piece part is wrapped and fixed on the positioning structure support rib, the radius of the semi-circular arc part is smaller than the outer diameter of the inclined plane of the wheel hub nut, and the top edge of the semi-circular arc part is higher than the outer edge of the inclined plane of the wheel hub nut after assembly.

Advantageous effects

Still be equipped with the additional strengthening who is used for shortening wheel center trim cover barycenter arm of force through the side for wheel hub bolt or nut on the buckle, can produce following beneficial effect:

1. the moment arm is reduced. The wheel center decorative cover is designed to protect the hub nut, so that the shape and the structural distribution of the wheel center decorative cover determine that the mass center of the wheel center decorative cover is always positioned outside the hub rather than clinging to the surface of the hub, a force arm is generated at the moment, the length of the force arm is determined by the contact surface of the buckle and the hub nut, the longer the buckle is, the farther the contact surface is, the longer the force arm is, and the larger the moment is. The tire jolts up and down in the running process, the more easily the buckle is slipped off from the hub nut under stress, and the same is true for the test of the fixing force of the wheel decorative cover. The utility model discloses an increase the additional strengthening that is used for shortening the central trim cover barycenter arm of force of wheel, shorten the length of the arm of force, effectively reduce moment under the unchangeable condition of quality, reduce the risk that the trim cover drops.

2. The nut is suitable for standard hub nuts. Because the utility model discloses can effectively reduce because of the moment that the wheel jolted and produced, reduce the risk that the trim cover drops, consequently can install the wheel trim cover additional for the standard wheel hub nut that conventional wheel adopted, and need not to force to change purpose-built wheel hub nut, increase the wheel aesthetic property when not increasing the cost. Meanwhile, the wheel trim cover which cannot pass the wheel trim cover fixing force test due to the adoption of the standard hub nut can be changed into the design, so that the fixing force is effectively increased while the additional cost is not increased.

3. And (5) damping. The central trim cover of wheel of conventional design mostly is buckle and wheel hub nut joint, and long-term vibrations make the easy tired plastic deformation that takes place in joint position, reduces the central trim cover security of wheel. Because the reinforcing structure is positioned on the side surface of the buckle rather than the tail end, the damping force is effectively increased by utilizing the elasticity of the plastic, the vibration amplitude during vibration is reduced, the plastic deformation of the clamping surface of the buckle and the nut is prevented, and the service lives of the buckle and the wheel center decorative cover are prolonged.

4. The magnitude of the mounting and dismounting force is not changed. The traditional way of increasing the fixing force of the central trim cover is to increase the strength of the central trim cover, such as reinforcing ribs, trim cover flanges, trim cover back reinforcing ribs and the like which are connected with the wheel trim cover through reinforcing buckles. The basic principle of the schemes is to increase the structural strength of the wheel decorative cover and ensure that the central decorative cover and the buckle are not easy to deform and not easy to fall off. However, the enhancement of the structure inevitably leads to the enhancement of the mounting and dismounting force of the central decorative cover, and increases the difficulty degree of the mounting operation. The utility model discloses a additional strengthening is located the buckle side, compares in vertical strengthening rib not influence, do not interfere the outside open deformation process of buckle when the trim cover installation, therefore does not change the size of installation, dismantlement power.

Drawings

Fig. 1 is a schematic structural view of a wheel hub nut.

Fig. 2 is a perspective view of a wheel center trim cover with an annular rib positioning structure.

Fig. 3 is a partially enlarged structural schematic diagram of a single bayonet in fig. 2.

Fig. 4 is a schematic view showing the effect of a reinforcing structure of a center trim cover of an annular rib positioning wheel.

Fig. 5 is a partially enlarged middle sectional view of a single bayonet in fig. 2.

Fig. 6 is a perspective view of a wheel center trim cover with a composite positioning structure.

Fig. 7 is a schematic view of a bayonet structure of the composite positioning structure.

Fig. 8 is a partially enlarged structural schematic diagram of a single bayonet in fig. 7.

FIG. 9 is a partially enlarged middle sectional view of the single bayonet of FIG. 7.

Fig. 10 is a perspective view of a wheel center trim cover employing a combination bayonet positioning structure.

Fig. 11 is a schematic view of the metal clip of fig. 10 engaged with the hub nut.

Fig. 12 is a partially enlarged structural schematic diagram of a single bayonet in fig. 10.

Wherein, 1, a hub nut; 1-1, nut inclined plane; 1-2 hexagonal surface of nut; 1-3 nut bearing surfaces; 2. a wheel center decorative cover adopting an annular rib positioning structure; 2-1, semi-surrounding the bayonet; 2-2, a bayonet groove; 2-3, bayonet support ribs; 2-4, positioning structure support ribs; 2-1-1, reversing; 2-1-2, transverse annular ribs; 2-1-3 longitudinal support ribs; 3. a wheel center decorative cover adopting a composite positioning structure; 3-1-1, nut support ribs; 3-1-2, a sawtooth structure; 4. a hub; 5. a hub bolt; 6. A wheel center decorative cover adopting a combined bayonet positioning structure; 6-1, metal buckles; 6-1-1, a semi-circular arc portion; 6-1-2 and fixing the flap part.

Like reference symbols in the various drawings indicate like elements.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes or modifications can be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

The utility model provides a wheel center trim cover location structure, the utility model discloses fix a position to wheel hub bolt and nut, consequently the relative position and the quantity of this structure and the wheel hub bolt one-to-one of waiting to install wheel center trim cover wheel, and wheel hub bolt quantity is usually by the motorcycle type decision, and most motorcycle types are 4, 5 or 6, also has the wheel hub that a small part of motorcycle type adopted two or three bolt. The utility model is used for the effect is better under the wheel of even number wheel hub bolt, can form a set of bayonet socket to the card because of location structure two liang of relatively, further ensures that bayonet socket installation power, locking force are concentric with the rotation axis.

A standard wheel hub nut 1 as shown in fig. 1 comprises a nut inclined surface 1-1, a nut hexagonal surface 1-2 and a nut support surface 1-3. The outer surfaces of the nut cannot be effectively utilized in the conventional design, and in some designs, the wheel hub nut 1 is changed into a special nut for firm fixation, and the inclined surface 1-1 of the special nut is made into a platform surface with a larger outer diameter so as to be matched with the buckle of the central decorative cover in a buckling manner, so that the cost and the assembly difficulty are obviously increased.

The utility model discloses a location structure mainly includes the primary structure and includes the bayonet socket, the bayonet socket divide into two parts altogether. Wherein one side facing the outer edge of the wheel is a cavity structure, a pair of positioning structure supporting ribs 2-4 are arranged in the direction vertical to the connecting line of the rotation center of the wheel center decorative cover and the wheel hub center, the other side opposite to the cavity structure is a semi-surrounding type bayonet 2-1, the top end of the semi-surrounding bayonet 2-1 is provided with an inverted buckle 2-1-1, the inverted buckle 2-1-1 is buckled with a nut inclined plane 1-1 of the hub nut 1, the back of the semi-surrounding bayonet 2-1 is provided with a plurality of longitudinal bayonet support ribs 2-3, a bayonet groove 2-2 is arranged between the cavity structure and the semi-surrounding bayonet 2-1, the bayonet is also provided with a reinforcing structure for shortening the force arm of the falling force of the wheel center trim cover at the periphery relative to the wheel hub bolt 5 or the hub nut 1.

The details of the design of the various reinforcing structures of the present invention are further described in detail by way of examples as follows:

example one

As shown in fig. 2, the wheel center trim cover 2 adopting the annular rib positioning structure in this embodiment is mainly formed by uniformly distributing 6 semi-surrounding bayonets 2-1 at 60 ° around the rotation center of the trim cover, and bayonet grooves 2-2 are formed at the left and right ends of the bayonet to increase the elasticity and deformation of the bayonet. Three bayonet support ribs 2-3 are arranged on the back surface of the bayonet, so that the strength of the bayonet is increased. Every two six bayonets form a set of bayonet socket to the bayonet socket, ensure bayonet socket installation power, dismantlement power, locking force and rotation axis concentric.

As shown in figure 3, the reinforcing structure in a single bayonet consists of an inverted buckle 2-1-1, five transverse annular ribs 2-1-2 and three longitudinal support ribs 2-1-3. The five transverse annular ribs 2-1-2 do not influence the outward opening process of the bayonet inverse buckle 2-1-1, so that the magnitude of the mounting and dismounting force is not changed.

As shown in fig. 4, the appearance surface is far from the wheel hub nut 1, which causes uneven mass distribution and results in displacement of the center of mass G due to the requirement of the wheel center trim cover. When the transverse annular rib 2-1-2 does not exist, the wheel decorative cover is restrained by the buckling surface to form a force arm L; when the transverse annular rib 2-1-2 is added, the wheel decorative cover is supported by the transverse annular rib 2-1-2 to form a force arm l. Under the condition of unchanged mass, the force arm is reduced, the moment is reduced, and the buckle above the central decorative cover is not easy to slip. Compared with the conventional design of the specially-made hub nut, the force arm of the hub nut extends to the platform surface of the specially-made hub nut, the fulcrum is closer to the outside, the force arm is larger, the corresponding moment is larger, and the hub nut is easier to fall off.

As shown in fig. 5, the reverse buckle 2-1-1 of the bayonet is in interference connection with the inclined surface 1-1 of the nut, so that the longitudinal positioning effect is achieved, and a part of the falling force of the decorative cover is improved in an auxiliary manner; five transverse annular ribs 2-1-2 on the side wall of the bayonet are in interference connection with the hexagonal surface 1-2 of the nut, and the effect of damping vibration attenuation is achieved by utilizing the elasticity of the bayonet ribs; the three longitudinal support ribs 2-1-3 are contacted with the nut support surface 1-3 to play a role in mounting and positioning the wheel center decorative cover.

Example two

As shown in fig. 6, the wheel center trim cover 3 of the present embodiment with a composite positioning structure is snap-fitted to the wheel hub 4 through the wheel hub nut 1.

As shown in FIG. 7, the bayonet structure in this embodiment is mainly composed of six half-enclosed bayonets 2-1 uniformly distributed at 60 degrees around the rotation center of the cover, and bayonet grooves 2-2 are formed at the left and right ends of the bayonet to increase the elasticity and deformation of the bayonet. Three bayonet support ribs 2-3 are arranged on the back surface of the bayonet, so that the strength of the bayonet is increased. Every two six bayonets form a set of bayonet socket to the bayonet socket, ensure bayonet socket installation power, dismantlement power, locking force and rotation axis concentric. The head of the hub bolt 5 is clamped in the middle of the nut support rib 3-1-1, and the six groups of hub bolts 5 and the nut support rib 3-1-1 interact to form a stable hexagonal positioning system, so that the structural reliability is improved.

As shown in fig. 8 and 9, the reinforcing structure in a single bayonet comprises three nut support ribs 3-1-1, the root parts and one side of the three nut support ribs 3-1-1 are fixed on the semi-surrounding bayonet 2-1, and the other side of the three nut support ribs is suspended in the air. The three nut support ribs 3-1-1 all have the function of axially supporting the nuts, and one of the middle of the three nut support ribs 3-1-1 plays a role of radially supporting. Two top ends of two sides of the nut support rib 3-1-1 are provided with sawtooth structures 3-1-2, the sawtooth structures 3-1-2 are inverted sawteeth, contact with the head of the hub bolt 5 and generate axial resistance with the thread of the hub bolt 5. Meanwhile, one side of the wheel hub is suspended, and the nut support rib 3-1-1 has certain elasticity, so that the wheel hub bolt 5 can be directly inserted during installation and cannot be easily pulled out after installation, and the wheel hub decorative cover 3 is effectively prevented from axially slipping.

The reverse buckle 2-1-1 of the bayonet is in interference clamping connection with the inclined surface 1-1 of the nut, and the thread of the hub bolt 5 is connected with the sawtooth structure 3-1-2 on the nut support rib 3-1-1 to form a single buckle assembly relation. Each group of buckles shorten the moment arm of the falling force of the wheel center trim cover from the axial distance L from the nut inclined plane 1-1 to the mass center of the hub nut 1 to the axial distance L from the sawtooth structure 3-1-2 to the mass center through the newly added reinforcing structure, and the moment arm which is greatly reduced effectively reduces the moment of the falling force of the center trim cover. Meanwhile, the structure of six groups realizes stable and reliable assembly relation, and improves the mechanical property of the decorative cover.

EXAMPLE III

As shown in fig. 10, the present embodiment is a wheel center cover 6 using a combined type bayonet positioning structure, the bayonet structure in the present embodiment mainly includes six half-enclosed bayonets 2-1 uniformly distributed at 60 ° around the rotation center of the cover, and bayonet grooves 2-2 are formed at the left and right ends of the bayonet to increase the elasticity and deformation of the bayonet. Three bayonet support ribs 2-3 are arranged on the back surface of the bayonet, so that the strength of the bayonet is increased. Every two of the six bayonets form a group of opposite bayonet, so that the mounting force, the dismounting force and the locking force of the bayonets are ensured to be concentric with the rotating shaft.

The reinforcing structure of the single bayonet comprises a semi-surrounding bayonet 2-1 and a special metal buckle 6-1 arranged on a support rib 2-4 of a positioning structure at two sides of the semi-surrounding bayonet.

As shown in FIG. 11, the metal buckle 6-1 comprises a semicircular arc part 6-1-1 and a fixed folding part 6-1-2 which are connected. The semi-circular arc part 6-1-1 is used for bearing the radial force and radial run-out of the hub nut 1. The fixed folding piece part 6-1-2 is wrapped and fixed on the positioning structure support rib 2-4, so that the metal buckle 6-1 cannot fall off. Through the combination of the two types of buckles, the hub nut 1 can be wrapped.

As shown in figure 12, the half-surrounding bayonet 2-1 and the metal buckle 6-1 are combined to fix the hub nut 1, the combined buckle realizes deformation and clamping of the half-surrounding buckle through the bayonet groove 2-2, and the rigidity of the buckle is increased through the bayonet support ribs 2-3.

The radius of the semi-circular arc part 6-1-1 is smaller than the outer diameter of the nut inclined plane 1-1 of the wheel hub nut 1, and the top edge of the semi-circular arc part 6-1-1 is higher than the outermost edge of the nut inclined plane 1-1 of the wheel hub nut 1 after assembly. The back-off 2-1-1 of the semi-surrounding bayonet 2-1 is in interference fit with the inclined surface 1-1 of the nut, three nut support ribs are arranged inside the semi-surrounding bayonet 2-1 and are in contact with the nut support surface 1-3 of the hub nut 1, and the nut support ribs and the nut support surface are combined to realize axial fastening of the wheel center decorative cover on the hub nut 1. Radial constraint of the trim cover on the nut is strengthened through the limitation of the metal buckle 6-1 of the reinforcing structure, the axial distance L from the center of the nut inclined plane 1-1 of the hub nut 1 to the center of mass of the force arm of the falling force of the trim cover at the center of the wheel is shortened to the axial distance L from the outer root of the nut inclined plane 1-1 to the center of mass, meanwhile, the moment of the falling force of the center trim cover is reduced through the slightly shortened force arm, and the stability of the trim cover is improved.

When the automobile runs at a high speed or encounters a falling and fluctuating road surface, the safety is a vital consideration for developing the center decorative cover of the wheel. The central decorative cover of the wheel is ensured not to fall off or slip, and the strength of the bayonet is particularly critical. Semi-surrounding bayonet socket has broken the shortcoming that traditional full-surrounding bayonet socket ubiquitous rigidity is not enough, and traditional full-surrounding bayonet socket receives the restriction that the product took off in the mould by force, and bayonet socket intensity requires more difficult than mould injection moulding, and semi-surrounding bayonet socket machine-shaping easily, and the mould is with low costs, and is more effective to promoting bayonet socket intensity.

Furthermore, in each embodiment, six semi-surrounding bayonets are uniformly distributed on one side of the hub nut in an angle of 60 degrees with the rotation center of the decorative cover, the decorative cover is locked on the inclined surface of the hub nut through the pretightening force generated by the interference of the inverted fastening surface, and meanwhile, the locking force is concentric with the rotation center of the wheel.

Further, the embodiment I relates to a wheel center decorative cover with annular ribs, the wheel center decorative cover is in contact with the inclined surface of a hub nut in a semi-surrounding bayonet manner, the transverse annular ribs on the inner side wall of the bayonet are in contact with the hexagonal side wall of the nut, and the hub nut is in contact with the support ribs on the bottom surface of the decorative cover. The annular rib of certain magnitude of interference has increased the frictional force of nut and bayonet socket lateral wall, and five narrow ribs also have certain elasticity than the structure of the big muscle of monoblock, effectively increase the damping. The working principle of designing five transverse ribs is that when the bayonet deforms and expands outwards, the transverse ribs do not obstruct the deformation of the bayonet, the mechanical property is improved, and the installation force is not increased.

Further, the second embodiment relates to a wheel center trim cover adopting a combined type positioning structure, support ribs at the bottom of the trim cover support the bottom surface of a hub nut, a side wall sawtooth structure is clamped with a hub bolt thread, six groups of sawtooth support ribs are distributed at 60 degrees, six degrees of freedom in three directions of the trim cover X, Y, Z are limited under the combined action, and a more fastening and reliable structural system is formed by the trim cover and the bayonet reverse buckle. Six sets of nut support ribs and sawtooth structures transfer the acting force point of the decorative cover and the nut from the semi-surrounding bayonet inverted buckle surface to the position below the nut support surface, and the acting force point is close to the product structure surface with better rigidity, thereby reducing the length of the force arm and ensuring that the whole decorative cover has good mechanical stability.

Further, the third embodiment relates to a wheel center trim cover adopting a combined bayonet positioning structure, one side of the wheel center trim cover is in contact with the inclined surface of a hub nut in a semi-surrounding bayonet manner, the other side of the wheel center trim cover is clamped with a rib position of the trim cover through a metal buckle on the back surface, the nut is supported through a semi-circular arc part structure, the radial impact force of the trim cover is borne, the circumferential runout is reduced, and the dynamic performance of the trim cover is improved. The nut is connected through back-off face joint to combination formula buckle one side, and the opposite side only plays the effect that the back supported, and installation, dismantlement power keep unchangeable the time, and combination formula buckle has promoted the holistic stability of trim cover structure.

The skilled person can select a suitable design scheme or further modify the reinforcing structure for shortening the moment arm of the center mass of the wheel center trim cover according to the needs.

Claims (7)

1. A wheel center trim cover positioning structure is circumferentially distributed on the inner surface of a wheel center trim cover, the number and relative positions of the positioning structures correspond to hub bolts on a wheel to be installed with the wheel center trim cover one by one, the positioning structure comprises a bayonet and is characterized in that the bayonet comprises two parts, wherein one side facing the outer edge of the wheel is a cavity structure, a pair of positioning structure supporting ribs (2-4) are arranged in the direction perpendicular to the connecting line of the rotation center of the wheel center trim cover and the center of the wheel hub, the other side opposite to the cavity structure is a semi-surrounding bayonet (2-1), the top end of the semi-surrounding bayonet (2-1) is provided with an inverted buckle (2-1-1), the inverted buckle (2-1-1) is buckled with a nut inclined plane (1-1) of a hub nut (1), the back of the semi-surrounding bayonet (2-1) is provided with a plurality of longitudinal bayonet support ribs (2-3), a bayonet groove (2-2) is arranged between the cavity structure and the semi-surrounding bayonet (2-1), and the bayonet is also provided with a reinforcing structure for shortening the force arm of the falling force of the wheel center decorative cover relative to the periphery of a wheel hub bolt (5) or a hub nut (1).

2. The wheel center trim cover positioning structure according to claim 1, wherein the reinforcing structure comprises a plurality of transverse annular ribs (2-1-2) arranged at an upper end region of the semi-surrounding bayonet (2-1), and a plurality of longitudinal support ribs (2-1-3) arranged at a lower end region of the semi-surrounding bayonet (2-1).

3. The wheel center trim cover positioning structure according to claim 2, wherein the number of the transverse annular ribs (2-1-2) is five, and the number of the longitudinal support ribs (2-1-3) is three.

4. The wheel center trim cover positioning structure according to claim 1, characterized in that the reinforcing structure comprises a plurality of nut support ribs (3-1-1), the root portions and one side of the nut support ribs are fixed on the semi-surrounding bayonet (2-1), the other side of the nut support ribs is suspended, and the top ends of the nut support ribs (3-1-1) are provided with sawtooth structures (3-1-2) which are in threaded fit with the hub bolts (5).

5. The wheel center trim cover positioning structure according to claim 4, wherein the serration structure (3-1-2) is an inverted serration for facilitating insertion of the hub bolt (5).

6. The wheel center trim cover positioning structure according to claim 1, wherein the reinforcing structure comprises a metal buckle (6-1) arranged above the cavity structure, and the metal buckle (6-1) comprises a semicircular arc part (6-1-1) and a fixed folding part (6-1-2) which are connected.

7. The wheel center trim cover positioning structure according to claim 6, wherein the fixing flap part (6-1-2) is wrapped and fixed on the positioning structure support rib (2-4), the radius of the semicircular arc part (6-1-1) is smaller than the outer diameter of the nut inclined plane (1-1) of the wheel hub nut (1), and the top edge of the semicircular arc part (6-1-1) is higher than the outermost edge of the nut inclined plane (1-1) after assembly.

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