Auxiliary wheel

Abstract

The auxiliary wheel comprises hubs and a tire, the hubs comprise an outer hub and an inner hub, the tire is installed on the outer wall of the outer hub, the outer hub and the inner hub are coaxially and detachably connected, a bearing for reducing friction is arranged at the connecting shaft position of the outer hub and the inner hub, and the auxiliary wheel is characterized in that a central shaft hole is formed in the center of the outer hub; a bearing seat with a shaft hole is arranged in the central shaft hole, and a bearing is mounted in the bearing seat; the central part of the inner hub is outwards connected with a connecting shaft, and the connecting shaft penetrates through the bearing seat and the bearing and is fixed together with the bearing; the end cover is detachably fixed to the outer side face of the bearing seat through a first connecting assembly and axially limited, a threaded hole is formed in the center of the connecting shaft, the center of the end cover is connected with a center bolt, and the end cover and the threaded hole of the connecting shaft are connected together through the center bolt. 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 specifically to 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 an auxiliary wheel that is simple in structure, lightweight, cost-effective, and easy to assemble, addressing the problems of existing technologies.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: an auxiliary wheel, including a hub and a tire, wherein the hub includes 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 coaxially and detachably connected, and the outer hub and the inner hub are provided with a bearing to reduce friction at the connecting shaft, characterized in that: the outer hub has a central shaft hole, a bearing seat with a shaft hole is provided in the central shaft hole, and a bearing is installed in the bearing seat; the inner hub is connected to a connecting shaft outward from the center, and the connecting shaft passes through the bearing seat and the bearing, and is fixed together with the bearing; an end cap is detachably fixed to the outer surface of the bearing seat and axially limited by a first connecting component, the connecting shaft has a threaded hole in the center, and a central bolt is connected to the end cap in the center, and the end cap is connected together with the threaded hole of the connecting shaft through the central bolt.

[0006] Furthermore, the inner hub first extends outward from the center to form a connecting cylinder for connecting the wheel axle, then narrows to extend outward to form a connecting shaft, and an annular step is provided at the narrowing point to abut against the bearing. 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 first connecting component uses bolts, and each of the end cap and its bearing seat has its own connecting holes and threaded holes distributed circumferentially on the side, which are detachably connected by bolts.

[0008] Furthermore, the outer diameter of the connecting cylinder and the mounting diameter of the inner side of the bearing seat are adapted to each other.

[0009] Furthermore, the inner hub has its own fixing holes distributed on its outer periphery, and the fixing holes are round holes, oblong holes, or / and combinations of holes with different radii.

[0010] Furthermore, the outer hub has its own fixing holes distributed on its outer periphery, and the fixing holes are round holes, oblong holes, or / and combinations of holes with different radii.

[0011] Furthermore, the outer hub has a recessed annular stepped surface at the central shaft hole, which is matched with the peripheral limit of the end cover.

[0012] Furthermore, the end cap has a central hole and a raised ring on the outer periphery of the central hole, which mates with the mounting opening on the outer side of the bearing housing. The raised ring 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 rotate relatively freely.

[0013] Finally, the end cap and the center bolt are made into one piece; the bearing seat is made into one piece by being embedded in the center shaft hole of the outer hub.

[0014] Compared with the prior art, the advantages of the present invention are as follows: By arranging the bearing between the outer hub and the inner hub on the connecting shaft and installing the connecting shaft and the bearing seat in the central shaft hole of the outer hub, the volume of the bearing and its bearing seat can be greatly reduced. There is no need for a large diameter annular body to fit and install it. The above design allows the inner and outer hubs to easily switch between the same direction of movement and relative movement. Therefore, 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. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the auxiliary wheel of the present invention;

[0016] Figure 2 This is a three-dimensional schematic diagram of the auxiliary wheel of the present invention (from another angle);

[0017] Figure 3 This is a three-dimensional exploded view of the auxiliary wheel of the present invention;

[0018] Figure 4 This is a three-dimensional anatomical view of the auxiliary wheel of the present invention;

[0019] Figure 5 This is a three-dimensional sectional view of the auxiliary wheel of the present invention. Detailed Implementation

[0020] 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.

[0021] 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.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 5 An auxiliary wheel includes a hub and a tire. The hub comprises an outer hub 1 and an inner hub 2. The tire 8 is mounted on the outer wall of the outer hub 1. Typically, the tire 8 is made of rubber or plastic material and can be directly molded and fixed to the circumferential surface of the outer hub 1 for easy assembly. The inner hub 2 first extends a connecting cylinder 21 outward from the center, forming a mounting hole 22 for the wheel axle. Then, it narrows and extends a connecting shaft 23 outward. An annular step 24 is provided at the narrowed diameter to abut against a bearing 3. Correspondingly, the outer hub 1 forms a central shaft hole 11 in the center. A bearing seat 4 with a shaft hole 41 is installed in the central shaft hole 11. The outer side of the outer hub 1 has a recessed annular step surface 12 at the central shaft hole 11, which fits with the periphery of the end cover 5 for positioning. The bearing 3 is installed and fixed in the bearing seat 4, and the connecting shaft 23 passes through the bearing 3 and the bearing seat 4 to abut against the axle. The bearing 3 is fixed together, and the end cover 5 is detachably fixed to the outer side of the bearing housing 4 by the first connecting component 7. The first connecting component 7 is bolted. The inner side of the end cover 5 has a protrusion, which is a convex ring 51 that matches the outer mounting diameter of the bearing housing 4. The convex ring 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. The outer part of the end cover 5 and the side of the bearing housing 4 are circumferentially distributed with their own connecting holes 52 and threaded holes 42, which are detachably connected by bolts. The end cover 5 is used to axially limit the connecting shaft 23 and its bearing 3 to prevent lateral movement. The end cover 5 has a center hole 53 in the center. At the same time, the connecting shaft 23 has a threaded hole 26 made in the center of its end face. It is connected by a center bolt 6 to connect the end cover 5 and the connecting shaft 23 together. Of course, for the convenience of assembly, the end cover 5 and the center bolt 6 can be made into a single piece. In this way, the outer hub 1 and the inner hub 2 are coaxially and detachably connected. The outer hub 1 is provided with a bearing 3 at the connecting shaft 23 to reduce friction. When the first connecting assembly 7 is removed, the bearing seat 4 and end cover 5 on the outer hub 1 are unlocked, so that the inner hub 2 and the outer hub 1 are in a state that can rotate relative to each other.

[0024] To facilitate assembly, the outer diameter of the connecting cylinder 21 and the mounting diameter of the inner side of the bearing housing 4 are adapted to each other and can be of the same radius. An annular step 24 is provided at the reduced diameter. The step presses on 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. The inner hub 2 has fixing holes 25 distributed on the outside of the connecting cylinder 21. The fixing holes 25 are round holes, oblong holes, or / and combinations of holes with different radii.

[0025] The outer hub 1 of the wheel is made of plastic, with numerous hollow areas and reinforcing ribs inside. This design achieves low cost and light weight without compromising strength, making it easy for users to lift. Simultaneously, the bearing housing 4 can be injection molded into the central shaft hole 11 of the outer hub 1 to form a single piece, facilitating assembly. The inner hub 2 is a metal component providing sufficient strength and increasing service life. The tire 8 is a rubber-plastic or plastic component molded integrally onto the outer hub 1, improving the tire's torsional resistance, providing good grip, preventing it from slipping off the ground, and offering wear resistance.

[0026] When the user needs to use the auxiliary wheel, tools are needed to remove the original wheel from the vehicle and install the auxiliary wheel onto the wheel axle. The inner wheel hub 2 is inserted into the mounting hole 22 on the inner side of the wheel axle and then firmly locked with detachable components such as bolts and nuts. The auxiliary wheel can then be used. If the wheel axle is locked, the first connecting component 7 can be removed so that the end cover 5 and the bearing seat 4 are not connected. The outer wheel hub 1 is then fixed on the bearing seat 3. This allows the inner wheel hub 2 and the outer wheel hub 1 to be in a state of relative rotation, and the auxiliary wheel can rotate to replace the wheel. It is very convenient and quick to use. Moreover, since the bearing is installed in the bearing hole, 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 easier to assemble and use.

Claims

1. An auxiliary wheel, comprising a hub and a tire, wherein 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 coaxially and detachably connected, wherein the outer hub and the inner hub are provided with a bearing at the connecting shaft to reduce friction, characterized in that: The outer hub has a central shaft hole, and a bearing seat with a shaft hole is installed in the central shaft hole, and a bearing is installed in the bearing seat; the inner hub has a connecting shaft connected to the outside of the center, and the connecting shaft passes through the bearing seat and the bearing, and is fixed together with the bearing; the end cover is detachably fixed to the outer surface of the bearing seat and axially limited by a first connecting assembly, the connecting shaft has a threaded hole in the center, and the end cover is connected to the center with a central bolt, and is connected together with the threaded hole of the connecting shaft through the central bolt.

2. The auxiliary wheel according to claim 1, characterized in that... The inner hub extends outward from the center to form a connecting cylinder for connecting the wheel axle, and then extends outward from the narrowed diameter to form a connecting shaft. An annular step is provided at the narrowed diameter to abut against the bearing. The front step presses on 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.

3. The auxiliary wheel according to claim 1, characterized in that... The first connecting component uses bolts, and each end cap and its bearing seat has its own connecting holes and threaded holes distributed circumferentially on the side, which are detachably connected by bolts.

4. The auxiliary wheel according to claim 1, characterized in that... The outer diameter of the connecting cylinder and the mounting opening diameter of the inner side of the bearing seat are adapted for connection.

5. The auxiliary wheel according to claim 1, characterized in that... The inner hub has its own fixing holes distributed on its outer perimeter. The fixing holes are round holes, oblong holes, or / and combinations of holes with different radii.

6. The auxiliary wheel according to claim 1, characterized in that... The outer hub has its own fixing holes distributed on its outer periphery. The fixing holes are round holes, oblong holes, or / and combinations of holes with different radii.

7. The auxiliary wheel according to claim 1, characterized in that... The outer hub has a recessed annular stepped surface at the central shaft hole, which is matched with the peripheral limit of the end cover.

8. The auxiliary wheel according to claim 1, characterized in that... The end cap has a central hole and a raised ring on the outer periphery of the central hole, which mates with the mounting opening on the outer side of the bearing housing. The raised ring 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 rotate relatively freely.

9. The auxiliary wheel according to claim 1, characterized in that... The end cap and the center bolt are made as a single piece.

10. The auxiliary wheel according to claim 1, characterized in that... The bearing housing is a single piece that is embedded in the central shaft hole of the outer hub.

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