Connecting device of auxiliary wheel

Abstract

A connecting device of an auxiliary wheel is characterized by comprising an outer connecting hub used for being connected with the auxiliary wheel and an inner connecting hub used for being connected with a wheel axle, the center of the outer connecting hub extends inwards to form a bearing seat with a shaft hole, and a bearing is installed in the bearing seat. An end cover is detachably fixed to the outer side face of the outer connecting hub through a first connecting assembly. The central part of the inner connecting hub extends outwards to form a connecting cylinder used for being connected with a wheel axle, and then extends outwards in the radial direction to form a connecting shaft, and the connecting shaft penetrates through a bearing seat and a bearing of the bearing seat and is fixed together with the bearing; a central threaded hole is formed in the center of the shaft end of the connecting shaft, and correspondingly, a central bolt is connected to the center of the end cover and fixedly connected with the shaft end of the connecting shaft through threads; the structure is simple and light, the cost is reduced, and the assembly is convenient.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and more specifically to a connecting device for an auxiliary wheel. Background Technology

[0002] As people's living standards improve, many families choose to purchase family cars. During the driving process, various accidents inevitably occur, causing the car to become unable to drive normally. At this time, it is necessary to call a tow truck. There are three common types of tow trucks: towing trailers, lift trailers, and flatbed trailers. When using a tow truck, the original wheels of the car can be replaced with auxiliary wheels, which facilitates car repair or towing.

[0003] Upon investigation, Chinese Patent No. 202321560337.9 discloses an auxiliary wheel, including a hub and a tire. The hub comprises an outer hub and an inner hub. The tire is mounted on the outer wall of the outer hub, and the outer hub and the inner hub are detachably connected by a first connecting assembly. When the first connecting assembly is disconnected from the outer hub and the inner hub, relative rotation can occur between the outer hub and the inner hub. The key feature is that a friction-reducing bearing is provided between the inner hub and the outer hub, which reduces the frictional force between the outer hub and the inner hub, thereby increasing the upper speed limit of the auxiliary wheel's rotation. Furthermore, the nut and bolt in the nut groove will... The ring body is firmly fixed to the outer wall of the outer hub, with a simple structure, convenient installation, low friction, and low tire wear. However, its shortcomings are as follows: the inner hub includes an annular body that can be inserted into the bearing through hole and a mounting plate extending radially from the periphery of the first end of the annular body. When the annular body is inserted into the bearing through hole, the mounting plate is located outside the through hole and abuts against the outer hub. The mounting plate and the outer hub are detachably connected by a first connecting assembly. Because the diameter of the annular body is relatively large, the diameter of the bearing and its mounting plate are also relatively large, resulting in higher material consumption, bulkiness, and cost. The number of connecting parts is also relatively increased, which is not conducive to assembly. Therefore, there is room for improvement. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a simple, lightweight, cost-effective, and easy-to-assemble auxiliary wheel connection device that addresses the problems of existing technologies. This device simplifies the structure of the auxiliary wheel to which it is connected, eliminating the need for material-intensive, bulky, and costly bearings and their annular bodies.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a connecting device for an auxiliary wheel, characterized in that it includes an outer connecting hub for connecting the auxiliary wheel and an inner connecting hub for connecting the wheel axle. The outer connecting hub has a bearing seat with an open shaft hole extending inward from the center. A bearing is installed in the bearing seat. An end cover is detachably fixed to the outer side of the outer connecting hub by a first connecting component. The inner connecting hub first extends a connecting cylinder for connecting the wheel axle outward from the center, and then extends a connecting shaft outward from the radial direction, allowing the connecting shaft to pass through the bearing seat and its bearing and be fixed together with the bearing. A central threaded hole is provided at the center of the shaft end of the connecting shaft. Correspondingly, a central bolt is connected to the center of the end cover and is threadedly connected and fixed to the shaft end of the connecting shaft.

[0006] Furthermore, the inner connecting hub has an annular step at the reduced diameter that matches the thickness of the bearing seat base plate. The front step presses on the inner ring of the bearing, restricting the axial movement of the bearing and ensuring that the outer ring of the bearing can rotate relatively freely.

[0007] Furthermore, the end cap has a raised ring on the inside, which presses against the inner ring of the bearing to restrict the axial movement of the bearing and ensure that the outer ring of the bearing can rotate relatively freely.

[0008] Furthermore, the first set of connecting parts uses bolts, the end cap has connecting holes distributed around the circumference on the outer part, and the outer connecting hub has threaded holes distributed around the circumference on the outer part of the bearing seat, and they are detachably connected by bolts.

[0009] Furthermore, the connecting cylinder and the bearing housing are connected with the same outer diameter.

[0010] Furthermore, the outer connecting hub has fixing holes distributed on the outer side of the bearing seat to connect to the auxiliary wheel. The fixing holes are round holes, oblong holes, or / and combinations of holes with different radii.

[0011] Furthermore, the inner connecting hub has fixing holes distributed on the outer periphery to connect to one side of the wheel axle. The fixing holes are round holes, oblong holes, or / and combinations of holes with different radii.

[0012] Furthermore, the auxiliary wheel includes an outer hub and an inner hub; the tire surrounds the outer periphery of the outer hub; the central part of the outer hub is provided with a through hole extending along its axial direction, the inner hub is at least partially inserted into the through hole, and the outer hub and the inner hub are detachably connected by a second connecting assembly.

[0013] Furthermore, the end cap and the center bolt are made as a single piece.

[0014] Finally, the auxiliary wheel connection device described above is not only compatible with the aforementioned auxiliary wheels, but also with wheels that are normally in use, thus having wide compatibility.

[0015] Compared with the prior art, the advantages of the present invention are as follows: By arranging the bearing between the outer connecting hub and the inner connecting hub on the connecting shaft and installing it in the bearing seat of the outer connecting hub, the volume of the bearing and its bearing seat can be greatly reduced. There is no need for a large diameter ring body to fit the installation, so the overall structure is simpler and lighter, reducing materials and costs. It can also be combined with auxiliary wheels and conventionally used wheels, so that the auxiliary wheels do not need a large diameter ring body and its large bearing seat and bearing, making the structure simpler and lighter, reducing materials and costs, and also facilitating assembly and use. Attached Figure Description

[0016] Figure 1 A three-dimensional schematic diagram of the auxiliary wheel connection device of the present invention after the auxiliary wheel has been installed;

[0017] Figure 2 A three-dimensional schematic diagram of the auxiliary wheel connection device of the present invention after the auxiliary wheel has been installed (from another angle);

[0018] Figure 3 An exploded perspective view of the auxiliary wheel connection device of the present invention after the auxiliary wheel has been installed;

[0019] Figure 4 This is a perspective view of the connecting device for the auxiliary wheel of the present invention;

[0020] Figure 5 This is a perspective view (from another angle) of the connecting device for the auxiliary wheel of the present invention.

[0021] Figure 6 This is a perspective sectional view of the connecting device for the auxiliary wheel of the present invention;

[0022] Figure 7 This is a three-dimensional anatomical view of the connecting device for the auxiliary wheel of the present invention. Detailed Implementation

[0023] The embodiments of this invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention patent based on the specific circumstances.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 7A connecting device A for an auxiliary wheel includes an outer connecting hub 1 and an inner connecting hub 2. The outer connecting hub 1 is used to connect an auxiliary wheel B, and the inner connecting hub 2 is used to connect a wheel axle. The inner connecting hub 2 first extends outward from its center to form a connecting cylinder 21 for connecting one side of the wheel axle, and simultaneously forms a central shaft hole 22. Then, it narrows its diameter and extends outward to form a connecting shaft 23. An annular step 24 that mates with a bearing seat is provided at the narrowed diameter. The annular step 24 presses against the inner ring of the bearing, restricting the axial movement of the bearing 3 and the connecting shaft 23, and ensuring that the outer ring of the bearing can rotate relatively freely. Correspondingly, the outer connecting hub 1 has a bearing housing 11 extending inward from its center. The bearing housing 11 has a central shaft hole 12. The thickness of the base plate 13 of the bearing housing 11 matches the annular step 24. The bearing 3 is installed in the bearing housing 11, and the connecting shaft 23 passes through the shaft hole 12 of the bearing housing 11 and the bearing 3, and is finally fixed together with the bearing 3. The outer side of the outer connecting hub 1 is detachably fixed with an end cover 4 by a first connecting assembly 6. The end cover 4 has a protrusion at its center that matches the end face of the bearing 3. The protrusion of the end cover 4 uses a convex ring 41. The outer diameter of the convex ring 41 matches the mounting hole on the outer side of the bearing housing 11. The convex ring 41 presses against the inner ring of the bearing, restricting the axial movement of the bearing and ensuring that the outer ring of the bearing can move relative to the bearing. The first set of connecting parts 6 is bolted, and the end cap 4 has evenly distributed connecting holes 42 around its outer periphery. Correspondingly, the outer connecting hub 1 also has evenly distributed threaded holes 14 around its outer periphery. They are detachably connected by bolts. In addition, the connecting shaft 23 has a central threaded hole 26 at its shaft end. Correspondingly, the end cap 4 has a central hole 43 at its center, through which the central bolt 5 passes and is threadedly connected to the shaft end of the connecting shaft 23. This makes the outer connecting hub 1 and the inner connecting hub 2 coaxially and detachably connected. The outer connecting hub 1 has a bearing 3 at the connection point with the connecting shaft 23 to reduce friction. For ease of operation, the end cap 4 and the central bolt 5 are made as a single piece. To facilitate assembly, the connecting cylinder 21 and the bearing housing 11 are connected with the same outer diameter. The outer connecting hub 1 has fixing holes 15 distributed around the bearing housing 11. Correspondingly, the inner connecting hub 2 has fixing holes 25 distributed around the connecting cylinder 21. The fixing holes 15 and 25 can be round holes, oblong holes, or / and combinations of holes with different radii, which facilitates the connection and installation of bolts, nuts, and auxiliary wheels B and wheel axles.

[0027] The auxiliary wheel B includes an outer hub 1b and an inner hub 2b. The tire 3b surrounds the outer circumference of the outer hub 1b. Typically, the tire 3b is made of rubber or plastic and can be directly molded and fixed to the circumferential surface of the outer hub 1b for easy assembly. The central part of the outer hub 1b has a through hole extending along its axial direction. The inner hub 2b is at least partially inserted into this through hole, and the outer hub 1b and the inner hub 2b are detachably connected by a second connecting component 4b, which is usually made of bolts and nuts. The outer hub 1b of the auxiliary wheel B is a plastic part with a large number of hollow areas and reinforcing ribs inside. Without reducing the strength, it is low in cost and lightweight, making it easy for users to lift. The inner hub 2b is a metal part that provides sufficient strength to increase service life. The tire 3b is a rubber or plastic part integrally molded on the outer hub, which improves the tire's torsional resistance, provides good grip and does not detach from the ground, and is resistant to friction.

[0028] When the user needs to use the auxiliary wheel B, tools are needed to remove the original wheel from the vehicle. Connect the connecting device A and the auxiliary wheel B, and use detachable connecting components such as bolts and nuts to connect and lock the fixing holes on the outer connecting hub 1 of the connecting device A and the inner hub 2b of the auxiliary wheel B together. Then, insert the inner central axle hole 22 of the inner connecting hub 2 into the fixing position on the wheel axle and secure it firmly with detachable connecting components such as bolts and nuts. After this, the auxiliary wheel B can be used. If the wheel axle is locked, the first connecting component 6 on the end cover 4 of the connecting device A can be removed, so that the end cover 4 is no longer connected to the outer connecting hub 2. This allows the inner connecting hub 2 and the outer connecting hub 1 to be in a state of relative rotation, and the auxiliary wheel B can rotate to replace the wheel. It is very convenient and quick to use. Moreover, since the bearing is installed in the bearing housing, there is no need for a large diameter ring body to fit the installation. The overall structure is simpler and lighter, reducing materials and costs. It also reduces the disassembly and fixing of connecting parts, making it easy to assemble and use.

[0029] According to the above method, connecting device A can also be used directly with the original wheel without the need for an auxiliary wheel.

Claims

1. A connecting device for an auxiliary wheel, characterized in that... It includes an outer connecting hub for connecting auxiliary wheels and an inner connecting hub for connecting wheel axles. The outer connecting hub has a bearing seat with an axle hole extending inward from its center. A bearing is installed in the bearing seat. An end cap is detachably fixed to the outer side of the outer connecting hub by a first connecting assembly. The inner connecting hub first extends a connecting cylinder for connecting wheel axles outward from its center, and then extends a connecting shaft outward from its radial direction, allowing the connecting shaft to pass through the bearing seat and its bearing and be fixed together with the bearing. A central threaded hole is provided at the center of the shaft end of the connecting shaft. Correspondingly, a central bolt is connected to the center of the end cap and is threadedly connected and fixed to the shaft end of the connecting shaft.

2. The auxiliary wheel connecting device according to claim 1, characterized in that... The inner connecting hub has an annular step at the reduced diameter that matches the thickness of the bearing seat base plate. The front step presses on the inner ring of the bearing, restricting the axial movement of the bearing and ensuring that the outer ring of the bearing can rotate relatively freely.

3. The auxiliary wheel connection device according to claim 1, characterized in that... The end cap has a raised ring on the inside, which presses against the inner ring of the bearing to restrict the axial movement of the bearing and ensure that the outer ring of the bearing can rotate relatively freely.

4. The auxiliary wheel connecting device according to claim 1, characterized in that... The first set of connecting parts uses bolts. The end cap has connecting holes distributed around the circumference on the outer part, and the outer connecting hub has threaded holes distributed around the circumference on the outer part of the bearing seat. They are detachably connected by bolts.

5. The auxiliary wheel connecting device according to claim 1, characterized in that... The connecting cylinder and bearing housing are connected with the same outer diameter.

6. The auxiliary wheel connecting device according to claim 1, characterized in that... The outer connecting hub has fixing holes on the outer side of the bearing housing for connecting to one side of the auxiliary wheel. The fixing holes are round holes, oblong holes, or / and combinations of holes with different radii.

7. The auxiliary wheel connecting device according to claim 1, characterized in that... The inner connecting hub has fixing holes distributed on the outer periphery to connect to one side of the wheel axle. The fixing holes are round holes, oblong holes, or / and combinations of holes with different radii.

8. The auxiliary wheel connecting device according to any one of claims 1 to 7, characterized in that... The auxiliary wheel includes an outer hub and an inner hub; a tire surrounds the outer circumference of the outer hub; the outer hub has a through hole extending axially at its central part, the inner hub is at least partially inserted into the through hole, and the outer hub and the inner hub are detachably connected by a second connecting assembly.

9. The auxiliary wheel connection device according to any one of claims 1 to 7, characterized in that... The end cap and the center bolt are made as a single piece.

10. The auxiliary wheel connection device according to any one of claims 1 to 7, characterized in that... The external connecting hub connects to a regular, normally used wheel, rather than an auxiliary wheel.

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