Wheel assembly of toy car and toy car

Abstract

The present invention discloses a wheel assembly of a toy car and a toy car, comprising an inner shaft, an outer shaft and a tire, wherein the outer shaft is sleeved on the inner shaft, and the inner shaft and the outer shaft are respectively clamped with the tire. The outer shaft of the present invention is set as a hollow structure, and the end of the outer shaft is provided with a clamping section. When the wheel is assembled with the toy frame, the clamping section is deformed inwardly in the installation groove and can be easily embedded in the installation groove of the frame. In addition, the inner shaft is inserted into the hollow cavity of the outer shaft, occupying the space of the outer shaft deforming inwardly, so that the clamping section on the outer shaft can no longer be deformed and separated from the frame, and is locked, so that infants and young children cannot disassemble the toy car, thereby improving the safety of the toy car. Moreover, the outer shaft of the present invention is movable relative to the inner shaft, the tire and the frame, and can rotate coaxially with the inner shaft and the tire, and can also rotate by friction in the installation groove of the frame, so that the wheel has better smoothness.

Description

Technical Field

[0001] The present invention relates to the technical field of toys, and in particular to a wheel assembly of a toy car and the toy car. Background Art

[0002] Existing toy car wheels generally include a cylindrical hub and a tire mounted on the hub. The wheel is connected to an axle fixed on the frame to drive the car. Such a wheel is mounted on an axle fixed on the frame. When the wheel drives the toy car forward, there is only one friction active surface (the wheel and the axle rotate relative to each other). It is difficult to ensure smooth mobility of the wheel. When multiple wheels on the toy car rotate at the same time, some wheels rotate while others do not, resulting in insufficient smoothness in the guidance of the entire toy car, thereby reducing the overall performance of the toy car.

[0003] Patent CN104755143B discloses a toy wheel assembly and a manufacturing method thereof, including a rim, a tire and an axle, wherein the tire is configured to surround the outer periphery of the rim when installed on the rim, the axle is configured to be connected to the rim coaxially with the rim, and its connection method allows the rim to rotate coaxially on the axle, the rim includes one or more protrusions, and the one or more protrusions are configured to radially engage an outer surrounding groove arranged on the axle when the axle is inserted into the axle receiving hole in the rim, and when the tire is installed on the rim, the one or more protrusions are retained in the surrounding groove by the inner surface of the tire. The axle of this patent is rotatable relative to the rim and the frame, but has high assembly requirements. If the assembly tolerance does not meet the requirements, the axle may not be able to rotate relative to the rim and the frame, and the smoothness of the toy car is difficult to ensure.

[0004] As mentioned above, although the wheel assembly of the existing toy car has a simple structure, it does not rotate smoothly enough, the connection is not firm enough, and the installation precision is required to be high. Specifically, for infants and young children, it is particularly necessary to provide a toy car with firm connection, simple installation and smooth rotation. Summary of the invention

[0005] In order to solve the technical problems that the existing toy car wheel assembly is not firmly connected, the installation precision requirement is high, and the toy car wheel rotates not smoothly enough, the first purpose of the present invention is to provide a toy car wheel assembly, including an inner shaft, an outer shaft and a tire, the outer shaft has a hollow part, the inner shaft extends into the hollow part and is contacted and connected with the hollow part, and the inner shaft and the outer shaft are respectively connected with the tire by clamping.

[0006] Furthermore, the inner shaft includes a wheel rim, which is fixedly arranged above the inner shaft, and at least two protrusions are arranged on the lower end surface of the wheel rim, and the wheel rim is clamped and connected to the tire through the protrusions.

[0007] Preferably, the wheel rim is integrally connected to the inner shaft.

[0008] Another preferred embodiment is that the wheel rim and the inner shaft are fixedly connected in a split manner.

[0009] Furthermore, the protrusion includes an arc-shaped protrusion arranged on the lower end surface of the rim, and a limiting block protruding from the arc-shaped protrusion is provided at the end of the arc-shaped protrusion.

[0010] Furthermore, a notch is provided on the tire, and the inner shaft and the tire are connected by clamping with the limit block through the notch.

[0011] Furthermore, the outer shaft includes a contact section and a connection section connected in sequence, a stopper is provided at one end of the contact section, the stopper is connected to the inner ring of the tire by clamping, and the connection section is used to configure the wheel assembly on the toy car. The outer shaft of the present invention is set as a hollow structure, the hollow part is in contact with the inner shaft, and the contact section is in contact with the inner ring of the tire. In this way, the outer shaft can move relative to the inner shaft and the tire, increasing the active surface of the wheel rotation and making the wheel guide smoother.

[0012] Furthermore, the outer shaft also includes a clamping section, which is located at the lower end of the connecting section and is clamped and connected to the toy car. The clamping section of the present invention protrudes from the end of the connecting section. Because the outer shaft is a hollow structure, the clamping section can be deformed inwardly through the installation groove of the toy car, and then clamped at the end of the installation groove, thereby realizing the clamping connection between the wheel and the toy car.

[0013] Furthermore, the wheel assembly is made of hard plastic.

[0014] The second object of the present invention is to provide a toy car, comprising any one of the wheel assemblies of the above-mentioned toy car. The toy car of the present invention can make the toy car guide more smoothly by using the above-mentioned at least four wheel assemblies. When the toy car is driving on a smooth or bumpy road, the wheel assemblies with the above-mentioned special structure can make at least four wheels rotate at the same time. In this way, the playability of the toy car can be improved.

[0015] A wheel assembly of a toy car and the toy car of the present invention have the following beneficial effects:

[0016] 1. A wheel assembly of a toy car of the present invention has a clamping section at the end of the outer shaft. When the wheel is assembled with the toy car, the clamping section is deformed inwardly in the mounting groove of the toy car and can be easily embedded in the mounting groove of the frame and then clamped at the end of the mounting groove.

[0017] 2. A wheel assembly of a toy car of the present invention has an outer shaft with a hollow portion, and the inner shaft extends into the hollow cavity of the outer shaft, occupying the space for the outer shaft to deform inward, so that the clamping section on the outer shaft can no longer deform and separate from the frame, thereby achieving locking.

[0018] 3. In a wheel assembly of a toy car of the present invention, the arc-shaped limit block on the wheel rim is engaged with the notch on the tire, so that the tire and the wheel rim can be locked, and the assembly is convenient and non-detachable.

[0019] 4. The wheel assembly and the toy car frame of the present invention cannot be disassembled after installation, which makes the connection between the wheel assembly and the toy car more firm and reliable; on the other hand, the volume of the toy car after installation is larger than the volume of the detachable parts of the toy car in the prior art, which avoids the situation that infants and young children swallow the toy car parts, thereby improving the safety of the toy car.

[0020] 5. In the wheel assembly of a toy car of the present invention, the outer shaft is movable relative to the inner shaft, the tire and the frame, and can rotate coaxially with the inner shaft, and can also rotate by friction in the mounting groove of the frame, so that the wheel has better smoothness.

[0021] 6. A toy car of the present invention can make the toy car more stable and smoother during the travel process by using multiple wheel assemblies of the present invention, thereby avoiding the situation where some wheels of the toy car do not rotate during the travel process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a main cross-sectional view of the wheel assembly of a toy car of the present invention.

[0024] Figure 2 The figure is a schematic cross-sectional view of the outer shaft of the wheel assembly of the toy car of the present invention.

[0025] Figure 3 The figure is a schematic cross-sectional view of the inner shaft of the wheel assembly of a toy car of the present invention.

[0026] Figure 4 The figure is a schematic cross-sectional view of a tire of a toy car wheel assembly according to the present invention.

[0027] Figure 5 The figure is a schematic diagram of assembling the wheel assembly and the frame of the toy car of the present invention.

[0028] Among them, 1-inner shaft, 2-outer shaft, 3-tire, 4-frame, 11-support part, 12-limiting part, 13-rim, 14-arc-shaped limiting block, 15-arc-shaped protrusion, 21-first hollow part, 22-second hollow part, 23-stop part, 24-contact section, 25-connecting section, 26-clamping section, 27-U-shaped notch, 31-outer ring, 32-inner ring, 33-installing groove, 34-notch, 35-middle part, 36-outer cavity, 37-inner cavity, 41-installing groove. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0030] The present invention provides a wheel assembly for a toy car, such as Figure 1-5 As shown, it includes an inner shaft 1, an outer shaft 2 and a tire 3. The outer shaft 2 is mounted on the inner shaft 1, and the inner shaft 1 and the outer shaft 2 are respectively engaged with the tire 3. The present invention does not limit the shapes of the inner shaft and the outer shaft, as long as the tire can be engaged with the inner shaft and the outer shaft.

[0031] Specifically, Figure 3As shown, a rim 13 is fixedly arranged above the inner shaft 1 of this embodiment, and the rim 13 is in the shape of an oblate cylinder and rotates coaxially with the inner shaft 1. Among them, at least two protrusions are arranged on the lower end surface of the rim 13, and the central angles of two adjacent protrusions are equal, and each protrusion is respectively connected with the notch 34 arranged on the tire. In some embodiments, the protrusions can be two, three, four or more. Preferably, two protrusions are symmetrically arranged on the lower end surface of the rim 13 of this embodiment, and each protrusion includes an arc-shaped protrusion 15 arranged on the lower end surface of the rim and extending along the circumference of the rim, and an arc-shaped limit block 14 protruding from the outer peripheral wall of the arc-shaped protrusion and extending along the circumference of the arc-shaped protrusion, wherein the arc-shaped protrusion 15 and the arc-shaped limit block 14 are both partially surrounded, and the central angles of each partial protrusion are equal, and the outer diameter of the arc-shaped protrusion 15 is the same as the outer diameter of the rim 13. In some embodiments, the lower end of the arc-shaped stopper 14 away from the arc-shaped protrusion 15 is chamfered, and the position where the chamfer of the lower end of the arc-shaped stopper 14 starts is flush with the outer periphery of the rim 13. During installation, the protrusion shrinks and deforms, and is strongly pressed into the notch 34 of the tire until the arc-shaped stopper 14 passes through the notch 34 and is snapped at the lower end of the notch 34. The arc-shaped stopper 14 is chamfered, which has a guiding effect on the pressure on the rim 13 during installation, making it easier for the arc-shaped stopper 14 to pass through the notch 34 and achieve snap-on connection. After installation, the rim 13 and the arc-shaped stopper 14 limit the tire 3 from the upper and lower directions to achieve mutual locking of the tire 3 and the rim 12. The protrusions of the preferred embodiment of the present invention are arc-shaped protrusions and arc-shaped stopper blocks, but the shapes of the protrusions of other embodiments can be designed into various shapes according to actual conditions, which are not specifically limited by the present invention and belong to the protection scope of the present invention.

[0032] In a preferred embodiment, the wheel rim and the inner shaft are connected in an integral manner. In another embodiment, the wheel rim and the inner shaft are fixedly connected in a split manner.

[0033] Specifically, Figure 4 As shown, the shape of the notch 34 on the tire matches the shape of the arc-shaped protrusion 15. As a more preferred embodiment, the notch 34 is arranged to be arc-shaped, the outer diameter of the notch 34 is the same as the outer diameter of the outer edge 13, the inner diameter of the notch is slightly larger than the outer diameter of the arc-shaped protrusion 15, and the two ends of the arc-shaped notch are provided with back-cut grooves in the direction close to the axis of the tire to facilitate the processing of the notch. The present invention provides one or two back-cut grooves at the notch 34 and does not limit the specific shape of the back-cut grooves.

[0034] Specifically, the tire in this embodiment includes an inner ring 32 and an outer ring 31, and the inner ring 32 and the outer ring 31 are connected together by an intermediate portion 35, the intermediate portion 35 is in a circular ring shape, the inner ring 31 is located at the lower end surface of the intermediate portion, the intermediate portion 35 and the inner ring 32 divide the space in the outer ring 31 into an inner cavity 37 and an outer cavity 36, and the outer cavity 36 is located below the intermediate portion 35 and outside the inner ring 32. In this embodiment, the notch 34 on the tire is symmetrically arranged on the intermediate portion 35, and the arc-shaped limit block 14 is located in the outer cavity 36, clamped on the lower end surface of the intermediate portion 35, and adjacent to the notch 34. In some preferred embodiments, reinforcing ribs are evenly arranged in the outer cavity 36, and the reinforcing ribs are respectively connected to the intermediate portion 35, the inner ring 32 and the outer ring 31. The arrangement of the reinforcing ribs makes the connection of the toy wheel assembly more firm and safer.

[0035] Specifically, Figure 2 As shown, the outer shaft 2 of this embodiment is a hollow structure, having a hollow portion, and the inner shaft extends into the hollow portion and contacts and connects with the hollow portion. Preferably, the hollow portion of the outer shaft includes a first hollow portion 21 and a second hollow portion 22, and the first hollow portion 21 and the second hollow portion 22 are both cylindrical, and the inner diameter of the first hollow portion 21 is larger than the inner diameter of the second hollow portion 22.

[0036] Since the outer shaft is set as a hollow structure, it not only brings innovation to the shape of the wheel, but also the hollow outer shaft can rotate relative to the tire and the inner shaft, increasing the active contact surface of the wheel and making the toy car run more smoothly.

[0037] Specifically, Figure 3 As shown, the inner shaft includes a limit portion 12 and a support portion 11, the outer diameter of the limit portion 12 is larger than the outer diameter of the support portion 11, and the outer diameter of the limit portion 12 matches the inner diameter of the first hollow portion 21, the outer diameter of the support portion 11 matches the inner diameter of the second hollow portion 22, and the first hollow portion 21 and the second hollow portion 22 are transitioned by chamfering or rounding, and the limit portion 12 and the support portion 11 are also transitioned by chamfering and rounding. Chamfering or rounding transition is beneficial to reducing the stress concentration caused by the relative movement between the outer wall of the inner shaft and the inner wall of the outer shaft. The connection mode between the inner shaft 1 and the outer shaft 2 of the present invention can be a fixed connection or a contact connection. Preferably, the inner shaft 1 and the outer shaft 2 are contact connected, and the outer shaft 2 is rotatable relative to the inner shaft 1.

[0038] Specifically, Figure 1As shown, the outer shaft 2 is inserted into the tire 3, and the outer shaft 2 has a stopper 23, which protrudes from the outer peripheral wall of the outer shaft contact section 24 and extends along the circumferential direction of the outer shaft, and the stopper 23 abuts against the inner ring mounting groove 33 on the inner ring 32 of the tire, thereby preventing the outer shaft 2 from being loosened from the tire 3, and enhancing the reliability of the assembly of the outer shaft 2 and the tire 3. Further, the mounting groove 33 surrounds the upper end of the inner ring 32 of the tire, the depth of the mounting groove 33 is slightly greater than the thickness of the stopper 23, and the inner diameter of the mounting groove 33 is slightly greater than the outer diameter of the stopper 23. The outer shaft contact section 24 of the present invention is located at the lower end of the stopper 23, and the outer shaft contact section 24 contacts and cooperates with the inner ring 32 of the tire, and the outer shaft 2 can also rotate relative to the tire 3.

[0039] Specifically, the outer shaft of this embodiment has a connecting section 25, which is located at the lower end of the outer shaft contact section 24, and is recessed in the outer peripheral wall of the outer shaft contact section 24 and extends along the circumferential direction of the outer shaft contact section 24. The connecting section 25 is used to configure the wheel assembly on the toy car. Figure 5 As shown, the connecting section 25 is matched and installed with the mounting groove 41 of the toy car frame 4, and the frame 4 is clamped on the connecting section 25. The interaction between the frame 4 and the outer shaft contact section 24 prevents the wheel assembly from moving toward the frame 4. The interaction between the frame 4 and the clamping section 26 prevents the wheel assembly from detaching from the frame and causing loosening.

[0040] Specifically, the clamping section 26 of this embodiment is located at the end of the connecting section 25, protrudes from the outer peripheral wall of the connecting section 25 and extends along the circumferential direction of the connecting section 25. The clamping section 26 is used to fix the wheel assembly on the toy vehicle. Two U-shaped notches 27 are symmetrically arranged on the clamping section 26 of this embodiment. The U-shaped notches 27 divide the clamping section 26 into two centrally symmetrical parts, and the U-shaped notches 27 extend to the connecting section 25. The setting of the U-shaped notches 27 facilitates the inward deformation of the clamping section 26 when the wheel assembly is installed, and facilitates the clamping section 26 to pass through the installation groove 41 and clamp at the end of the installation groove 41. In some embodiments, the end of the clamping section 26 is set to be chamfered to reduce the resistance of the clamping section 26 during installation and achieve quick installation. During the installation process, the outer shaft is first inserted into the tire to achieve contact installation between the outer shaft and the tire, and then the clamping section 26 and the connecting section 25 on the outer shaft are inserted into the installation groove 41 to achieve connection between the clamping section 26, the connecting section 25 and the frame, and finally the inner shaft 1 is inserted into the hollow cavity of the outer shaft 2. It should be noted that once the inner shaft 1 is inserted into the hollow cavity of the outer shaft, the inner shaft occupies the space for the outer shaft 2 to deform inward, and the clamping section 26 on the outer shaft can no longer deform and detach from the frame 4, thereby achieving locking of the wheel assembly with the frame 4. The wheel assembly of the present invention and the toy car frame cannot be disassembled after installation, making the connection between the wheel assembly and the toy car more firm and reliable; on the other hand, the volume of the toy car after installation is larger than the volume of the detachable parts of the toy car in the prior art, which prevents infants and young children from swallowing toy car parts and improves the safety of the toy car.

[0041] It should be noted that the connecting section 25 on the outer shaft 2 can rotate relative to the mounting groove 41 of the frame, thereby increasing the movable contact surface between the wheel and the frame, making the toy car smoother during travel.

[0042] Specifically, the wheel assembly of the present invention is made of hard plastic or a material equivalent to plastic. In some embodiments, the tire 3 can be made of rubber, and the inner shaft 1 and the outer shaft 2 can be made of metal, such as aluminum, steel, etc.

[0043] Another embodiment of the present invention relates to a chassis of a toy vehicle, including one or more toy wheel assemblies of the present invention, the chassis of the toy vehicle after the toy wheel assemblies of the present invention are installed can receive other parts, such as building blocks. The toy wheel assemblies of the present invention can be part of a toy set.

[0044] Another embodiment of the present invention relates to a toy car, comprising any one or more wheel assemblies of the above-mentioned toy cars. The toy car can be a car, a motorcycle, a train, a building block car or a large truck. The toy car of this embodiment comprises four wheel assemblies of the above-mentioned toy cars. In the wheel assemblies of the prior art, it is difficult to achieve simultaneous rotation of four wheels during the travel of the toy car. In the wheel assemblies of the present invention, the outer shaft is movable relative to the inner shaft, the frame and the tire, thereby achieving smooth rotation of four or more wheels, and the toy car runs more smoothly.

[0045] The terms “upper”, “lower”, “first” and “second” in the present invention are only for the convenience of description and should not be construed as limiting the actual content of the present invention.

[0046] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in the field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A wheel assembly for a toy car, characterized in that: It comprises an inner shaft, an outer shaft and a tire, wherein the outer shaft has a hollow portion, the inner shaft extends into the hollow portion, and the inner shaft and the outer shaft are respectively engaged with the tire; The tire comprises an inner ring and an outer ring, wherein the inner ring and the outer ring are integrally connected through a middle portion, wherein the middle portion is in a circular ring shape, the inner ring is located at the lower end surface of the middle portion, and the middle portion and the inner ring divide the space in the outer ring into an inner cavity and an outer cavity, wherein the outer cavity is located below the middle portion and outside the inner ring; reinforcing ribs are evenly arranged in the outer cavity, and the reinforcing ribs are respectively connected to the middle portion, the inner ring and the outer ring; The hollow part of the outer shaft includes a first hollow part and a second hollow part, the first hollow part and the second hollow part are both cylindrical, and the inner diameter of the first hollow part is larger than the inner diameter of the second hollow part; The inner shaft includes a limiting portion and a supporting portion, the outer diameter of the limiting portion is larger than the outer diameter of the supporting portion, and the outer diameter of the limiting portion matches the inner diameter of the first hollow portion, and the outer diameter of the supporting portion matches the inner diameter of the second hollow portion; A wheel rim is fixedly arranged above the inner shaft, and at least two protrusions are arranged on the lower end surface of the wheel rim. The wheel rim is clamped with the tire through the protrusions, and the wheel rim is integrally connected with the inner shaft; The protrusion comprises an arc-shaped protrusion arranged on the lower end surface of the wheel rim, and a limit block protruding from the arc-shaped protrusion is provided at the end of the arc-shaped protrusion; The tire is provided with a notch, which is symmetrically arranged on the middle part. The limiting block is located in the outer cavity, clamped on the lower end surface of the middle part and adjacent to the notch, and the notch is clamped with the limiting block; The outer shaft comprises a contact section and a connecting section which are connected in sequence, a stopper is provided at one end of the contact section, the stopper is connected with the inner ring of the tire by clamping, and the connecting section is used to configure the wheel assembly on the toy car; The outer shaft further comprises a clamping section, which is located at the lower end of the connecting section and is clamped and connected to the toy car.

2. The wheel assembly of a toy car according to claim 1, characterized in that: The material of the wheel assembly is hard plastic.

3. A toy car, characterized in that: A wheel assembly for a toy car comprising the wheel assembly of claim 1 or 2.

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