CN213565258U

CN213565258U - Rim structure of hub

Info

Publication number: CN213565258U
Application number: CN202022738047.1U
Authority: CN
Inventors: 刘湘平
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-06-29
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a wheel hub's rim structure, include rim unit A's dress tread along the axle center in proper order, annular tube A, rim unit B's annular tube B and dress child face, it is fixed with annular tube A that rim unit B's dress child face one end is kept away from to annular tube B, annular tube A keeps away from rim unit A's dress child face one end and annular tube B fixed, form toroidal cavity between annular tube A and annular tube B's the junction, the annular chamber is located between rim unit A and rim unit B's the dress child face, be equipped with the amortization chamber in the toroidal cavity, the amortization chamber respectively with between tire and the rim between the tire chamber intercommunication that forms. According to the structure, the utility model discloses a wheel hub's rim structure enables in the annular cavity of muffler direct fixation rim or the annular cavity directly as the muffler to avoid appearing the muffler and drop to the tire intracavity from rim.

Description

Rim structure of hub

Technical Field

The utility model relates to a wheel hub's for the vehicle technical field, concretely relates to wheel hub's rim structure.

Background

It is known that air column resonance generated in a tire air chamber formed between a tire and a rim of a wheel hub becomes a factor of load noise of an automobile. The air column resonance is a resonance phenomenon that random excitation input transmitted from a road surface to a tire tread during running vibrates air in a tire air chamber and occurs in the vicinity of a resonance frequency of the tire air chamber. Due to this resonance phenomenon, air column resonance noise is generated in the tire air chamber. The air column resonance noise is transmitted to the vehicle body via the suspension, and is sensed as load noise in the vehicle. As a hub for reducing such load noise, there have been proposed various structures provided with a helmholtz resonator having a sub air chamber communicating with a tire air chamber via a communication hole. However, when the hub rotates, a shock excitation input is generated to the tire when the tire tread is in contact with the ground. The prior solutions generally provide sound attenuation by adding a helmholtz resonator to the outer circumferential surface of the hub. However, this causes two problems, first, the helmholtz resonator is additionally fixed to the outer circumferential surface of the rim, and the helmholtz resonator may be separated from the hub and fall into the tire cavity as the hub rotates and vibrates and the hub is heated and deformed during the running of the vehicle; once drop to the tire intracavity, the effect of amortization has just been lost to the helmholtz resonator, and the helmholtz resonator is scurried along with the rotation of wheel in the tire moreover, not only can improve the noise of tire on the contrary, still can harm the potential safety hazard of bad tire even.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the rim structure of the wheel hub overcomes the defects of the prior art, and the silencing cavity is positioned between the tire mounting surfaces at two ends of the rim, so that the space of the rim can be fully utilized, the space for the silencing cavity is large enough, more silencing frequencies can be increased, and the silencing effect is improved; the silencer can be directly fixed in the annular cavity of the rim or directly used as the silencer, so that the silencer is prevented from falling into the tire cavity from the rim; the rim is formed by the rim unit A and the rim unit B, the production of the rim can be realized by casting, forging, spinning, plate processing and other production and processing methods, the rim structure with the annular cavity is convenient to produce, and the practicability of the utility model is improved; no matter a casting hub production enterprise or a forging hub production enterprise, additional equipment does not need to be purchased, and the existing equipment is directly utilized for production; the annular cavity can be used as a silencer according to different rims, and the silencer can be fixed in the annular cavity; thereby improving the applicability of the structure of the utility model; after the silencer is arranged in the annular cavity, the limitation on the material of the silencer is small, and the material of the silencer can be aluminum, copper, iron or engineering plastics.

The utility model adopts the technical proposal that:

the rim structure of the wheel hub comprises a rim unit A and a rim unit B which are fixedly connected with each other coaxially, wherein the rim unit A and the rim unit B sequentially comprise a tire mounting surface of the rim unit A, an annular pipe A of the rim unit A, an annular pipe B of the rim unit B and a tire mounting surface of the rim unit B along the axis, one end, far away from the tire mounting surface of the rim unit B, of the annular pipe B is fixed with the annular pipe A, one end, far away from the tire mounting surface of the rim unit A, of the annular pipe A is fixed with the annular pipe B, an annular cavity is formed between the connecting positions of the annular pipe A and the annular pipe B, the annular cavity is located between the tire mounting surface of the rim unit A and the tire mounting surface of the rim unit B, a silencing cavity is arranged in the annular cavity, the silencing cavity is respectively communicated with a tire cavity formed between a tire and a rim, and a tire mounting groove is further arranged.

The utility model discloses the further improvement scheme be, annular pipe A dorsad the tire cavity annular pipe B is towards the tire cavity, the noise damping chamber passes through annular pipe B and communicates with the tire cavity through-hole A that establishes on corresponding to the pipe wall of toroidal cavity.

The utility model discloses a further improvement scheme is, through-hole A directly communicates with the amortization chamber as the amortization air vent or the amortization breather pipe of through-hole A internal seal fixedly connected with intercommunication amortization chamber and tire chamber.

The utility model has the further improvement scheme that when the annular cavity is directly formed into a silencing cavity through the clapboard B arranged on the annular pipe B or directly through the clapboard A arranged on the annular pipe A, the through hole A is directly used as a silencing vent hole, and the annular cavity is directly used as a silencer; when the annular cavity is internally fixed with the silencer, the through hole A is communicated and matched with a corresponding through hole B of a silencing cavity arranged in the silencer, and a silencing vent pipe communicated with the silencing cavity and the tire cavity is fixedly connected in the through hole A and the through hole B in a sealing mode.

The utility model discloses a further improvement is, one side that annular pipe A is close to rim unit B's dress tread is equipped with the annular groove to the direction in directional axle center, the border that annular pipe B is close to rim unit A's dress tread one side is fixed with the tank bottom in the annular groove to the toper crown plate after the direction of directional axle center is buckled and the annular groove corresponds the cell wall that is located rim unit B within range one side and rim unit B is fixed.

The utility model discloses further improve the scheme and be, the annular groove is close to the cell wall of dress child face one side of rim unit A and the conical ring board after annular tube B buckles and the annular groove's the tank bottom formation dress child groove of annular groove between the conical ring board after rim unit B one side and annular tube B buckle are kept away from to the annular groove.

The utility model discloses further improve the scheme be, perhaps, annular pipe A is close to and forms the step pipe after backward buckling to the direction of the directional axle center of one side direction of dress tread of rim unit B is buckled, annular pipe B is close to one side direction directional axle center of dress tread of rim unit A and is equipped with dress child groove and the dress child groove is close to the cell wall of dress tread one side of rim unit A and forms the annular pipe C that sets up with the axle center with rim unit B to the direction of directional axle center, annular pipe C is fixed with the step pipe towards the one end of dress tread of rim unit A and the one side of dress tread of step pipe face to rim unit B is fixed with dress tread groove one side to rim unit A's dress tread.

The utility model discloses a further improvement is, annular pipe A correspond to rim unit A's tip border annular pipe B is equipped with respectively corresponding to rim unit B's tip border and is used for connecting fixed connecting portion.

The utility model discloses further improve the scheme be, the dress tread of rim unit A and the dress tread of rim unit B structure between all are located the space range that the line of the highest point of two dress treads opposite ends formed.

The utility model discloses further improve the scheme and be, rim unit A or rim unit B are fixed with the axle center with the spoke.

The beneficial effects of the utility model reside in that:

firstly, the rim structure of the wheel hub of the utility model enables the silencing cavity to be positioned at the position of the rim between the tire mounting surfaces at two ends, which not only can make full use of the space of the rim, but also can increase more silencing frequencies and improve the silencing effect by using the space of the silencing cavity to be large enough; and the silencer can be directly fixed in the annular cavity of the rim or directly used as the silencer, so that the silencer is prevented from falling into the tire cavity from the rim.

Second, the utility model discloses a wheel hub's rim structure constitutes the rim through rim unit A and rim unit B, can realize the production of rim through production and processing methods such as casting, forging, spinning, panel processing, is convenient for produce the rim structure that has toroidal cavity, has improved the utility model discloses a practicality.

Third, the utility model discloses a wheel hub's rim structure no matter is casting wheel hub manufacturing enterprise or forges wheel hub manufacturing enterprise, all need not to purchase equipment in addition, directly utilizes existing equipment to produce.

Fourthly, the rim structure of the wheel hub of the utility model can lead the annular cavity to be used as a silencer according to different rims, and the silencer can also be fixed in the annular cavity; thereby improving the applicability of the structure of the utility model.

Fifth, the utility model discloses a wheel hub's rim structure, through set up the muffler after in the annular cavity, less to the restriction of the material of muffler, the material of muffler can be aluminium, copper, iron or engineering plastics.

Description of the drawings:

fig. 1 is a front sectional partial schematic view of embodiment 1 of the present invention.

Fig. 2 is a front sectional partial schematic view of embodiment 2 of the present invention.

Fig. 3 is a front sectional partial schematic view of embodiment 3 of the present invention.

Fig. 4 is a front sectional partial schematic view of embodiment 4 of the present invention.

The specific implementation mode is as follows:

the utility model discloses a rim structure of wheel hub, including with axle center fixed connection's rim unit A1 and rim unit B2, include dress tread 4 of rim unit A1, annular tube A5 of rim unit A1, annular tube B6 of rim unit B2 and dress tread 4 of rim unit B2 along the axle center in proper order, annular tube B6 is kept away from dress tread 4 of rim unit B2 one end and is fixed with annular tube A5 and annular tube A5 keeps away from dress tread 4 of rim unit A1 and is fixed with annular tube B6, forms annular cavity 7 between the junction of annular tube A5 and annular tube B6, annular cavity 7 is located between dress tread 4 of rim unit A1 and dress tread 4 of rim unit B2, be equipped with amortization chamber 10 in the annular cavity 7, amortization chamber 10 communicates with what form between tire and the rim respectively, the rim cavity faces the periphery of rim cavity on the tire, A tire mounting groove 8 is also arranged between the tire mounting surfaces 4; the annular tube A5 faces away from the tire cavity, the annular tube B6 faces towards the tire cavity, and the sound attenuation cavity 10 is communicated with the tire cavity through a through hole A11 formed in the tube wall of the annular tube B6 corresponding to the annular cavity 7; the through hole A11 is directly used as a noise reduction vent hole to be communicated with the noise reduction cavity 10 or a noise reduction vent pipe which is used for communicating the noise reduction cavity 10 with the tire cavity is fixedly connected in the through hole A11 in a sealing way; when the annular cavity 7 directly forms the sound-deadening cavity 10 through the partition plate B15 arranged on the annular pipe B6 or directly through the partition plate A14 arranged on the annular pipe A5, the through hole A11 directly serves as a sound-deadening vent hole, and the annular cavity 7 directly serves as a sound silencer; when the annular cavity 7 is internally fixed with the silencer 13, the through hole A11 is communicated and matched with a corresponding through hole B of the silencing cavity 10 arranged in the silencer 13, and a silencing vent pipe for communicating the silencing cavity 10 with the tire cavity is fixedly connected in the through hole A11 and the through hole B in a sealing manner; an annular groove 9 is formed in the side, close to the tire mounting surface 4 of the rim unit B2, of the annular pipe A5 in the direction pointing to the axis, a conical annular plate, bent in the direction pointing to the axis, of the edge, close to the tire mounting surface 4 of the rim unit A1, of the annular pipe B6 is fixed to the groove bottom in the annular groove 9, and the groove wall, corresponding to the annular groove 9, located on one side in the range of the rim unit B2 is fixed to the rim unit B2; the tyre mounting groove 8 is formed by the groove wall of the annular groove 9 close to the tyre mounting surface 4 side of the rim unit A1 and the conical ring plate after the annular pipe B6 is bent, and the groove bottom of the annular groove 9 between the groove wall of the annular groove 9 far away from the rim unit B2 side and the conical ring plate after the annular pipe B6 is bent; or, one side of the annular tube a5 close to the tire mounting surface 4 of the rim unit B2 is bent towards the direction pointing to the axis and then bent reversely to form a step tube 16, one side of the annular tube B6 close to the tire mounting surface 4 of the rim unit a1 is provided with a tire mounting groove 8 towards the direction pointing to the axis, a groove wall of the tire mounting groove 8 close to the tire mounting surface 4 of the rim unit a1 is bent towards the direction pointing to the axis to form an annular tube C coaxially arranged with the rim unit B2, one end of the annular tube C facing the tire mounting surface 4 of the rim unit a1 is fixed with the step tube 16, and one end of the step tube 16 facing the tire mounting surface 4 of the rim unit B2 is fixed with one side of the tire mounting groove 8 facing the tire mounting surface 4 of the rim unit a 1; the annular pipe A5 and the annular pipe B6 are respectively provided with connecting parts 12 for connecting and fixing corresponding to the end edge of the rim unit A1 and the end edge of the rim unit B2; the structure between the tire mounting surface 4 of the rim unit A1 and the tire mounting surface 4 of the rim unit B2 is located in a space range formed by a connecting line of the highest positions of the opposite ends of the two tire mounting surfaces 4; the rim unit a1 or the rim unit B2 is fixed coaxially with the disc 3.

Example 1

As can be seen from FIG. 1, the wheel rim comprises a rim unit A1 and a rim unit B2 which are fixedly connected with each other coaxially, and sequentially comprises a tire mounting surface 4 of a rim unit A1, an annular pipe A5 of the rim unit A1, an annular pipe B6 of a rim unit B2 and a tire mounting surface 4 of a rim unit B2 along the axial center, the end of the annular tube B6, which is far away from the tread surface 4 of the rim unit B2, is fixed with the annular tube A5, the end of the annular tube A5, which is far away from the tread surface 4 of the rim unit A1, is fixed with the annular tube B6, an annular cavity 7 is formed between the joints of the annular tube A5 and the annular tube B6, the annular chamber 7 is located between the tread 4 of the rim unit a1 and the tread 4 of the rim unit B2, a sound-deadening cavity 10 is arranged in the annular cavity 7, the sound-deadening cavity 10 is respectively communicated with a tire cavity formed between a tire and a rim, a tire mounting groove 8 is also formed in the circumferential surface of the rim facing the tire cavity and between the tire mounting surfaces 4; the annular tube A5 faces away from the tire cavity, the annular tube B6 faces towards the tire cavity, and the sound attenuation cavity 10 is communicated with the tire cavity through a through hole A11 formed in the tube wall of the annular tube B6 corresponding to the annular cavity 7; a silencer 13 is fixed in the annular cavity 7, the through hole A11 is communicated and matched with a corresponding through hole B of a silencing cavity 10 arranged in the silencer 13, and a silencing vent pipe for communicating the silencing cavity 10 with a tire cavity is fixedly connected in the through hole A11 and the through hole B in a sealing manner; an annular groove 9 is formed in the side, close to the tire mounting surface 4 of the rim unit B2, of the annular pipe A5 in the direction pointing to the axis, a conical annular plate, bent in the direction pointing to the axis, of the edge, close to the tire mounting surface 4 of the rim unit A1, of the annular pipe B6 is fixed to the groove bottom in the annular groove 9, and the groove wall, corresponding to the annular groove 9, located on one side in the range of the rim unit B2 is fixed to the rim unit B2; the tyre mounting groove 8 is formed by the groove wall of the annular groove 9 close to the tyre mounting surface 4 side of the rim unit A1 and the conical ring plate after the annular pipe B6 is bent, and the groove bottom of the annular groove 9 between the groove wall of the annular groove 9 far away from the rim unit B2 side and the conical ring plate after the annular pipe B6 is bent; the annular pipe A5 and the annular pipe B6 are respectively provided with connecting parts 12 for connecting and fixing corresponding to the end edge of the rim unit A1 and the end edge of the rim unit B2; the structure between the tire mounting surface 4 of the rim unit A1 and the tire mounting surface 4 of the rim unit B2 is located in a space range formed by a connecting line of the highest positions of the opposite ends of the two tire mounting surfaces 4; the rim unit B2 is fixed coaxially with the disc 3.

Example 2

As can be seen from FIG. 2, the rim comprises a rim unit A1 and a rim unit B2 which are fixedly connected with each other coaxially, and sequentially comprises a tire mounting surface 4 of a rim unit A1, an annular pipe A5 of the rim unit A1, an annular pipe B6 of a rim unit B2 and a tire mounting surface 4 of a rim unit B2 along the axial center, the end of the annular tube B6, which is far away from the tread surface 4 of the rim unit B2, is fixed with the annular tube A5, the end of the annular tube A5, which is far away from the tread surface 4 of the rim unit A1, is fixed with the annular tube B6, an annular cavity 7 is formed between the joints of the annular tube A5 and the annular tube B6, the annular chamber 7 is located between the tread 4 of the rim unit a1 and the tread 4 of the rim unit B2, a sound-deadening cavity 10 is arranged in the annular cavity 7, the sound-deadening cavity 10 is respectively communicated with a tire cavity formed between a tire and a rim, a tire mounting groove 8 is also formed in the circumferential surface of the rim facing the tire cavity and between the tire mounting surfaces 4; the annular tube A5 faces away from the tire cavity, the annular tube B6 faces towards the tire cavity, and the sound attenuation cavity 10 is communicated with the tire cavity through a through hole A11 formed in the tube wall of the annular tube B6 corresponding to the annular cavity 7; the through hole A11 is directly used as a silencing vent hole to be communicated with the silencing cavity 10, and the annular cavity 7 is directly used as a silencer; a sound-deadening cavity 10 is formed in the annular cavity 7 directly through a partition plate A14 arranged on an annular pipe A5, and the through hole A11 directly serves as a sound-deadening vent hole; an annular groove 9 is formed in the side, close to the tire mounting surface 4 of the rim unit B2, of the annular pipe A5 in the direction pointing to the axis, a conical annular plate, bent in the direction pointing to the axis, of the edge, close to the tire mounting surface 4 of the rim unit A1, of the annular pipe B6 is fixed to the groove bottom in the annular groove 9, and the groove wall, corresponding to the annular groove 9, located on one side in the range of the rim unit B2 is fixed to the rim unit B2; the tyre mounting groove 8 is formed by the groove wall of the annular groove 9 close to the tyre mounting surface 4 side of the rim unit A1 and the conical ring plate after the annular pipe B6 is bent, and the groove bottom of the annular groove 9 between the groove wall of the annular groove 9 far away from the rim unit B2 side and the conical ring plate after the annular pipe B6 is bent; the annular pipe A5 and the annular pipe B6 are respectively provided with connecting parts 12 for connecting and fixing corresponding to the end edge of the rim unit A1 and the end edge of the rim unit B2; the structure between the tire mounting surface 4 of the rim unit A1 and the tire mounting surface 4 of the rim unit B2 is located in a space range formed by a connecting line of the highest positions of the opposite ends of the two tire mounting surfaces 4; the rim unit a1 is fixed coaxially with the spokes 3.

Example 3

As can be seen from FIG. 3, the rim comprises a rim unit A1 and a rim unit B2 which are fixedly connected with each other coaxially, and sequentially comprises a tire mounting surface 4 of a rim unit A1, an annular pipe A5 of the rim unit A1, an annular pipe B6 of a rim unit B2 and a tire mounting surface 4 of a rim unit B2 along the axial center, the end of the annular tube B6, which is far away from the tread surface 4 of the rim unit B2, is fixed with the annular tube A5, the end of the annular tube A5, which is far away from the tread surface 4 of the rim unit A1, is fixed with the annular tube B6, an annular cavity 7 is formed between the joints of the annular tube A5 and the annular tube B6, the annular chamber 7 is located between the tread 4 of the rim unit a1 and the tread 4 of the rim unit B2, a sound-deadening cavity 10 is arranged in the annular cavity 7, the sound-deadening cavity 10 is respectively communicated with a tire cavity formed between a tire and a rim, a tire mounting groove 8 is also formed in the circumferential surface of the rim facing the tire cavity and between the tire mounting surfaces 4; the annular tube A5 faces away from the tire cavity, the annular tube B6 faces towards the tire cavity, and the sound attenuation cavity 10 is communicated with the tire cavity through a through hole A11 formed in the tube wall of the annular tube B6 corresponding to the annular cavity 7; a partition plate B15 arranged in the annular cavity 7 directly through an annular pipe B6 forms a silencing cavity 10, the through hole A11 directly serves as a silencing vent hole, and the annular cavity 7 directly serves as a silencer; one side of the annular tube A5 close to the tire mounting surface 4 of the rim unit B2 is bent towards the direction pointing to the axis and then bent reversely to form a step tube 16, one side of the annular tube B6 close to the tire mounting surface 4 of the rim unit A1 is provided with a tire mounting groove 8 towards the direction pointing to the axis, the groove wall of one side of the tire mounting groove 8 close to the tire mounting surface 4 of the rim unit A1 is bent towards the direction pointing to the axis to form an annular tube C coaxially arranged with the rim unit B2, one end of the annular tube C facing the tire mounting surface 4 of the rim unit A1 is fixed with the step tube 16, and one end of the step tube 16 facing the tire mounting surface 4 of the rim unit B2 is fixed with one side of the tire mounting groove 8 facing the tire mounting surface 4 of the rim unit A1; the annular pipe A5 and the annular pipe B6 are respectively provided with connecting parts 12 for connecting and fixing corresponding to the end edge of the rim unit A1 and the end edge of the rim unit B2; the structure between the tire mounting surface 4 of the rim unit A1 and the tire mounting surface 4 of the rim unit B2 is located in a space range formed by a connecting line of the highest positions of the opposite ends of the two tire mounting surfaces 4; the rim unit B2 is fixed coaxially with the disc 3.

Example 4

As can be seen from fig. 4, the rim comprises a rim unit a1 and a rim unit B2 fixedly connected with the same axle center, and the tread 4 of the rim unit a1, an annular tube a5 of the rim unit a1, an annular tube B6 of the rim unit B2 and the tread 4 of the rim unit B2 are sequentially arranged along the axle center, one end of the annular tube B6, which is far away from the tread 4 of the rim unit B2, is fixed with the annular tube a5, one end of the annular tube a5, which is far away from the tread 4 of the rim unit a1, is fixed with the annular tube B6, an annular cavity 7 is formed between the joints of the annular tube a5 and the annular tube B6, the annular cavity 7 is positioned between the tread 4 of the rim unit a1 and the tread 4 of the rim unit B2, a sound-damping cavity 10 is arranged in the annular cavity 7, and the sound-damping cavity 10 is respectively communicated with the tire cavity formed between the tire and the rim, and the rim cavity faces the circumferential surface of the rim cavity formed between the tire and the rim A tire mounting groove 8 is also arranged between the tire mounting surfaces 4; the annular tube A5 faces away from the tire cavity, the annular tube B6 faces towards the tire cavity, and the sound attenuation cavity 10 is communicated with the tire cavity through a through hole A11 formed in the tube wall of the annular tube B6 corresponding to the annular cavity 7; a silencer 13 is fixed in the annular cavity 7, the through hole A11 is communicated and matched with a corresponding through hole B of a silencing cavity 10 arranged in the silencer 13, and a silencing vent pipe for communicating the silencing cavity 10 with a tire cavity is fixedly connected in the through hole A11 and the through hole B in a sealing manner; one side of the annular tube A5 close to the tire mounting surface 4 of the rim unit B2 is bent towards the direction pointing to the axis and then bent reversely to form a step tube 16, one side of the annular tube B6 close to the tire mounting surface 4 of the rim unit A1 is provided with a tire mounting groove 8 towards the direction pointing to the axis, the groove wall of one side of the tire mounting groove 8 close to the tire mounting surface 4 of the rim unit A1 is bent towards the direction pointing to the axis to form an annular tube C coaxially arranged with the rim unit B2, one end of the annular tube C facing the tire mounting surface 4 of the rim unit A1 is fixed with the step tube 16, and one end of the step tube 16 facing the tire mounting surface 4 of the rim unit B2 is fixed with one side of the tire mounting groove 8 facing the tire mounting surface 4 of the rim unit A1; the annular pipe A5 and the annular pipe B6 are respectively provided with connecting parts 12 for connecting and fixing corresponding to the end edge of the rim unit A1 and the end edge of the rim unit B2; the structure between the tire mounting surface 4 of the rim unit A1 and the tire mounting surface 4 of the rim unit B2 is located in a space range formed by a connecting line of the highest positions of the opposite ends of the two tire mounting surfaces 4; the rim unit a1 is fixed coaxially with the spokes 3.

Claims

1. A rim structure of wheel hub which characterized in that: comprises a rim unit A (1) and a rim unit B (2) which are fixedly connected with each other, and sequentially comprises a tire mounting surface (4) of the rim unit A (1), an annular pipe A (5) of the rim unit A (1), an annular pipe B (6) of the rim unit B (2) and a tire mounting surface (4) of the rim unit B (2) along the axis, wherein one end of the annular pipe B (6), which is far away from the tire mounting surface (4) of the rim unit B (2), is fixed with the annular pipe A (5), one end of the annular pipe A (5), which is far away from the tire mounting surface (4) of the rim unit A (1), is fixed with the annular pipe B (6), an annular cavity (7) is formed between the connection parts of the annular pipe A (5) and the annular pipe B (6), and the annular cavity (7) is positioned between the tire mounting surface (4) of the rim unit A (1) and the tire mounting surface (4) of the rim unit B (2), the tire is characterized in that a silencing cavity (10) is arranged in the annular cavity (7), the silencing cavity (10) is respectively communicated with a tire cavity formed between a tire and a rim, and tire mounting grooves (8) are further formed in the circumferential surface of the rim facing the tire cavity and between tire mounting surfaces (4).

2. A rim structure of a hub as claimed in claim 1, wherein: the annular tube A (5) faces away from the tire cavity, the annular tube B (6) faces towards the tire cavity, and the sound attenuation cavity (10) is communicated with the tire cavity through a through hole A (11) formed in the tube wall of the annular tube B (6) corresponding to the annular cavity (7).

3. A rim structure of a hub as claimed in claim 2, wherein: the through hole A (11) is directly communicated with the silencing cavity (10) as a silencing vent hole or a silencing vent pipe which is fixedly connected with the silencing cavity (10) and the tire cavity in the through hole A (11) in a sealing manner.

4. A rim structure of a hub as claimed in claim 3, wherein: when the annular cavity (7) directly forms a silencing cavity (10) through a partition plate B (15) arranged on the annular pipe B (6) or a partition plate A (14) arranged on the annular pipe A (5), the through hole A (11) directly serves as a silencing vent hole, and the annular cavity (7) directly serves as a silencer; when a silencer (13) is fixed in the annular cavity (7), the through hole A (11) is communicated and matched with a corresponding through hole B of a silencing cavity (10) arranged in the silencer (13), and a silencing vent pipe for communicating the silencing cavity (10) with the tire cavity is fixedly connected in the through hole A (11) and the through hole B in a sealing mode.

5. A rim structure of a hub as claimed in claim 2, wherein: annular tube A (5) are close to one side of dress tread (4) of rim unit B (2) and are equipped with annular groove (9) to the direction of directional axle center, the toper ring plate after the border that annular tube B (6) are close to dress tread (4) one side of rim unit A (1) is buckled to the direction of directional axle center is fixed with the tank bottom in annular groove (9), and annular groove (9) are corresponding to be located the cell wall and rim unit B (2) of rim unit B (2) within range one side and are fixed.

6. A rim structure of a hub as claimed in claim 5, wherein: the tyre assembling groove is characterized in that a groove wall of the annular groove (9) close to one side of the tyre assembling surface (4) of the rim unit A (1), the conical ring plate of the annular pipe B (6) after bending, and a groove bottom of the annular groove (9) between the groove wall of the annular groove (9) far away from one side of the rim unit B (2) and the conical ring plate of the annular pipe B (6) after bending form a tyre assembling groove (8).

7. A rim structure of a hub as claimed in claim 2, wherein: one side of the annular pipe A (5) close to the tire mounting surface (4) of the rim unit B (2) is bent towards the axis and then reversely bent to form a step pipe (16), a tire loading groove (8) is arranged on one side of the annular pipe B (6) close to the tire loading surface (4) of the rim unit A (1) in the direction pointing to the axis, the groove wall of the tire loading groove (8) close to the tire loading surface (4) of the rim unit A (1) is bent in the direction pointing to the axis to form an annular pipe C which is coaxial with the rim unit B (2), one end of the annular tube C facing the tire mounting surface (4) of the rim unit A (1) is fixed with a step tube (16), and one end of the step tube (16) facing the tire mounting surface (4) of the rim unit B (2) is fixed with one side of the tire mounting groove (8) facing the tire mounting surface (4) of the rim unit A (1).

8. A rim structure of a hub as claimed in claim 2, wherein: the annular pipe A (5) is provided with a connecting part (12) corresponding to the end edge of the rim unit A (1) and the annular pipe B (6) is provided with a connecting part (12) corresponding to the end edge of the rim unit B (2).

9. A rim structure of a hub as claimed in claim 1, wherein: the structure between the tire mounting surface (4) of the rim unit A (1) and the tire mounting surface (4) of the rim unit B (2) is located in a space range formed by connecting lines of the highest positions of the opposite ends of the two tire mounting surfaces (4).

10. A rim structure of a hub as claimed in claim 1, wherein: the rim unit A (1) or the rim unit B (2) is coaxially fixed with the spoke (3).