Hollow trundle

Abstract

The hollow trundle comprises a hub, two trundle bodies and two trundle covers, the hub is provided with a hollow shaft, the hollow shaft is provided with a shaft hole, a first clamping structure and a second clamping structure are arranged on the inner wall of the shaft hole in the axial direction at intervals, the first clamping structure comprises a first protrusion, and the second clamping structure comprises a second protrusion. The projections of the first protrusions and the second protrusions in the axis direction of the shaft hole are staggered. The two wheel bodies are rotationally installed at the two opposite ends of the hollow shaft in a one-to-one correspondence mode. One ends of the two wheel covers penetrate through the two wheel bodies in a one-to-one correspondence mode, clamping grooves are formed in one ends of the wheel covers, blocking covers are arranged at the other ends of the wheel covers, the two wheel bodies are located between the two blocking covers, and the first protrusions and the second protrusions are clamped in the clamping grooves in the two wheel covers in a one-to-one correspondence mode. According to the hollow trundle, it can be guaranteed that the wheel cover is convenient to install, meanwhile, it can be guaranteed that the hub is easier and more convenient to produce, production cost is reduced, and production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a trundle technical field, especially a hollow trundle. BACKGROUND

[0002] The hollow trundle usually includes a hollow hub, two annular wheel bodies and two wheel covers, the two wheel bodies are one by one correspondingly rotatably installed at the two ends of the hollow shaft of the hub, one end of the two wheel covers is one by one correspondingly penetrated through the two wheel bodies and inserted into the hollow shaft of the hub, and the other end of the wheel cover is covered on the wheel body. In the prior art, there are mainly two installation modes between the wheel cover and the hollow shaft, one installation mode is that the wheel cover is in interference fit with the hollow shaft and is glued to avoid the wheel cover from falling off, in this mode, the wheel cover is not easy to install, which is not conducive to improving the production efficiency, and the other installation mode is that the hub and the wheel cover are connected through the cooperation between the annular clamping groove and the annular protrusion, but since the two annular protrusions or annular clamping grooves cannot be directly formed on the inner wall of the hollow shaft of the hollow hub through a mold, the annular protrusion is arranged on the hollow wheel cover, and the annular clamping groove needs to be machined on the inner wall of the hollow shaft of the formed hollow hub, in this installation mode, although the wheel cover is easy to install, the production process of the hub is not simple, which is not conducive to reducing the production cost and improving the production efficiency. SUMMARY

[0003] The utility model aims at least to solve one of the technical problems existing in the prior art. Therefore, the utility model provides a hollow trundle, which can ensure that the hub is produced more simply and conveniently while ensuring that the wheel cover is easy to install, and is conducive to reducing the production cost and improving the production efficiency.

[0004] The hollow trundle according to the embodiment of the utility model, including hub, two wheel bodies and two wheel covers, the hub has a hollow shaft, the hollow shaft has an axle hole, the inner wall of the axle hole is provided with a first clamping structure and a second clamping structure along the axial direction, the first clamping structure includes at least one first protrusion, all the first protrusions are arranged on the inner wall of the axle hole along the circumferential direction of the axle hole, the second clamping structure includes at least one second protrusion, all the second protrusions are arranged on the inner wall of the axle hole along the circumferential direction of the axle hole, wherein the projection of the first protrusion and the second protrusion in the axial direction of the axle hole is staggered, the two wheel bodies are one by one correspondingly rotatably installed at the opposite two ends of the hollow shaft, one end of the two wheel covers is one by one correspondingly penetrated through the two wheel bodies, one end of the wheel cover is provided with a clamping groove, the other end of the wheel cover is provided with a cover, wherein the two wheel bodies are located between the two covers, the first protrusion and the second protrusion are one by one correspondingly clamped on the clamping groove on the two wheel covers.

[0005] According to the hollow caster, at least the following beneficial effects are achieved: the hollow caster provided by the utility model, in the process of installing the wheel cover, only needs to insert two wheel covers into the shaft hole, then can realize the clamping between the two wheel covers and the wheel hub through the first protrusion and the second protrusion on the inner wall of the shaft hole and the clamping groove on the two wheel covers, thereby completing the installation of the wheel cover, the process of gluing between the wheel cover and the hollow shaft can be omitted, the installation of the wheel cover is more convenient, meanwhile, the projection of the first protrusion and the second protrusion in the axial direction of the shaft hole is staggered, so that the first protrusion and the second protrusion can be molded together through a mold in the process of forming the wheel hub, the subsequent processing step on the inner wall of the shaft hole is omitted, thereby ensuring that the production of the wheel hub is simple and convenient, and being conducive to reducing the production cost and improving the production efficiency.

[0006] According to some embodiments of the utility model, the first clamping structure includes one first protrusion, the first protrusion is arc-shaped, the corresponding central angle of the first protrusion is less than or equal to 180 degrees, the second clamping structure includes one second protrusion, the second protrusion is arc-shaped, the corresponding central angle of the second protrusion is less than or equal to 180 degrees.

[0007] According to some embodiments of the utility model, the side of the first protrusion away from the second protrusion is a first transition surface, the side of the second protrusion away from the first protrusion is a second transition surface, the first transition surface and the second transition surface are both inclinedly arranged relative to the axis of the shaft hole, in each wheel cover, the clamping groove is close to the end of the wheel cover, and the end of the wheel cover is provided with a third transition surface, the third transition surface is used for cooperating with the first transition surface or the second transition surface.

[0008] According to some embodiments of the utility model, the side of the first protrusion close to the second protrusion is a first clamping surface, the side of the second protrusion close to the first protrusion is a second clamping surface, the first clamping surface and the second clamping surface are both perpendicular to the axis of the shaft hole, in each wheel cover, the inner side of the clamping groove close to the third transition surface is a third clamping surface, the third clamping surface is used for cooperating with the first clamping surface or the second clamping surface.

[0009] According to some embodiments of the utility model, the wheel cover includes a mounting shaft, one end of the mounting shaft is rotatably inserted into the hollow shaft, the clamping groove is circular, the clamping groove is arranged on the outer peripheral wall of the mounting shaft around the axis of the mounting shaft, and the cover is connected to the other end of the mounting shaft.

[0010] According to some embodiments of the utility model, the mounting shaft is hollow, and the outer contour of the cover is circular.

[0011] According to some embodiments of the present application, the wheel body is provided with a groove on the side away from the hub, and the cover is at least partially located in the groove.

[0012] According to some embodiments of the present application, the wheel body is rotatably installed on the hollow shaft through a bearing.

[0013] According to some embodiments of the present application, the hub is rotatably installed with an external connector for external connection, and the rotation axis between the external connector and the hub is arranged at an angle with the rotation axis of the wheel body.

[0014] According to some embodiments of the present application, a first brake mechanism is arranged between the wheel body and the hub, a second brake mechanism is arranged between the external connector and the hub, and the first brake mechanism and the second brake mechanism are arranged in linkage.

[0015] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

[0017] Figure 1 is a sectional view of the hollow caster of the embodiments of the present application;

[0018] Figure 2 is Figure 1 is an enlarged view of the middle A;

[0019] Figure 3 is Figure 1 is an enlarged view of the middle B;

[0020] Figure 4 is Figure 1 is an exploded view of a hollow caster;

[0021] Figure 5 is Figure 1 is a sectional view of the wheel cover of the hollow caster;

[0022] Figure 6 is Figure 1 is a schematic view of the hub of the hollow caster;

[0023] Figure 7 is Figure 6 is an enlarged view of the middle C.

[0024] REFERENCE NUMERALS:

[0025] Hub 100, hollow shaft 110, shaft hole 110a, first protrusion 111, first transition surface 1111, first clamping surface 1112, second protrusion 112, second transition surface 1121, second clamping surface 1122, wheel body 200, recess 210, wheel cover 300, mounting shaft 310, clamping groove 311, third clamping surface 3111, third transition surface 312, cover 320, bearing 400, outer joint 500, first brake mechanism 610, second brake mechanism 620. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0027] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the upper, lower, front, rear, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0028] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for distinguishing the technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0029] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0030] In the prior art, the hub 100 is usually molded by a mold, and the shaft hole 110a of the hollow shaft 110 is molded by a mold core. However, the annular clamping groove that needs to be arranged on the shaft hole 110a cannot be molded by the mold core. If the annular clamping groove is molded, a protrusion in an annular shape needs to be arranged on the outer periphery of the mold core. However, the protrusion interferes with the inner wall of the molded hollow shaft 110, so that the mold core cannot be pulled out. Therefore, the annular clamping groove needs to be machined on the inner wall of the hollow shaft 110 of the molded hollow hub 100. In addition, if two annular protrusions are arranged on the inner wall of the shaft hole 110a of the hollow shaft 110, an annular recess groove is actually formed between the two annular protrusions. Similarly, the two annular protrusions cannot be molded on the inner wall of the hollow shaft 110 by the mold, and need to be arranged on the inner wall of the shaft hole 110a by other machining processes. Therefore, the existing hub 100 needs to go through other processes after being molded by the mold to realize the clamping connection with the wheel cover 300.

[0031] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 , according to the hollow caster of the embodiment of the utility model, the hub 100 has a hollow shaft 110, the hollow shaft 110 has a shaft hole 110a, the inner wall of the shaft hole 110a is spaced apart in the axial direction and is provided with a first clamping structure and a second clamping structure, the first clamping structure comprises at least one first protrusion 111, all the first protrusions 111 are arranged on the inner wall of the shaft hole 110a and protrude in the circumferential direction of the shaft hole 110a, the second clamping structure comprises at least one second protrusion 112, all the second protrusions 112 are arranged on the inner wall of the shaft hole 110a and protrude in the circumferential direction of the shaft hole 110a, wherein the projections of the first protrusion 111 and the second protrusion 112 in the axial direction of the shaft hole 110a are staggered with each other; the two wheels 200 are one-to-one correspondingly rotatably arranged on the opposite ends of the hollow shaft 110; one end of the two wheel covers 300 is one-to-one correspondingly arranged in the two wheels 200, one end of the wheel cover 300 is provided with a clamping groove 311, the other end of the wheel cover 300 is provided with a cover 320, wherein the two wheels 200 are located between the two covers 320, and the first protrusion 111 and the second protrusion 112 are one-to-one correspondingly clamped in the clamping groove 311 on the two wheel covers 300. The wheel cover 300 can be used for decoration to improve the appearance of the entire hollow caster. In addition, the wheel cover 300 can also shield between the hollow shaft 110 and the wheel 200, so as to avoid the exposure of the rotating connection position between the wheel 200 and the hollow shaft 110, thereby playing a protection role.

[0032] The hollow caster provided by the utility model, in the process of installing the wheel cover 300, only need to insert two wheel covers 300 into the shaft hole 110a, then can be matched one by one through the first protrusion 111 and the second protrusion 112 on the inner wall of the shaft hole 110a and the clamping slot 311 on the two wheel covers 300, realize the clamping between the two wheel covers 300 and the hub 100, thus complete the installation of the wheel cover 300, can save the process of gluing between the wheel cover 300 and the hollow shaft 110, make the installation of the wheel cover 300 more convenient, improve the installation efficiency.

[0033] In addition, the hollow caster provided by the utility model, through the projection of the first protrusion 111 and the second protrusion 112 in the axial direction of the shaft hole 110a is staggered, thus avoids the formation of the recessed groove between the first protrusion 111 and the second protrusion 112, the mold can adopt two mutually matched mold cores to form the first protrusion 111 and the second protrusion 112, and the taking out of the two mold cores is not affected after forming, thus, through the above setting, the first protrusion 111 and the second protrusion 112 can be molded together through the mold in the hub 100 molding process, the subsequent step of other processing on the inner wall of the shaft hole 110a is saved, the production of the hub 100 is simple and convenient, which is beneficial to reduce the production cost and improve the production efficiency.

[0034] Among them, since the clamping slot 311 is located on the outer peripheral wall of the wheel cover 300, through the adoption of the split mold, the clamping slot 311 can be molded together while the wheel cover 300 is molded, then the parts of the split mold on the outside of the wheel cover 300 are moved away along the radial direction.

[0035] Referring to Figure 6 and Figure 7 According to some embodiments of the utility model, the first clamping structure includes a first protrusion 111, the first protrusion 111 is arc-shaped, the central angle corresponding to the first protrusion 111 is equal to 180 degrees, the second clamping structure includes a second protrusion 112, the second protrusion 112 is arc-shaped, the central angle corresponding to the second protrusion 112 is equal to 180 degrees. Of course, in actual production, the central angle corresponding to the first protrusion 111 can also be a little smaller than 180 degrees, and the central angle corresponding to the second protrusion 112 can also be a little smaller than 180 degrees. Through the above setting, the number of the first protrusion 111 and the second protrusion 112 can be minimized, the mold for molding the hub 100 can be simplified, and the production difficulty is reduced.

[0036] Of course, in other embodiments, if considering increasing the mounting strength and stability of the wheel cover 300, the first protrusions 111 can be selected to be provided in two or more, all of the first protrusions 111 being arranged in a circle around the axis of the shaft hole 110a, likewise, the second protrusions 112 can be selected to be provided in two or more, all of the second protrusions 112 being arranged in a circle around the axis of the shaft hole 110a, at the same time, the first protrusions 111 and the second protrusions 112 are mutually staggered, so that the projections of the first protrusions 111 and the second protrusions 112 in the axial direction of the shaft hole 110a do not overlap, so as to ensure that each of the first protrusions 111 and the second protrusions 112 can be formed together with the hub 100, by using the above-mentioned arrangement, the wheel cover 300 can be mounted more firmly and stably.

[0037] In the specific implementation process, the skilled in the art can determine the number of the first protrusions 111 and the second protrusions 112 according to the size of the caster and other actual conditions.

[0038] With reference to Figure 2 , Figure 3 and Figure 7 , according to some embodiments of the present application, the side of the first protrusion 111 away from the second protrusion 112 is a first transition surface 1111, the side of the second protrusion 112 away from the first protrusion 111 is a second transition surface 1121, the first transition surface 1111 and the second transition surface 1121 are both arranged obliquely relative to the axis of the shaft hole 110a, in each wheel cover 300, the clamping groove 311 is close to the end of the wheel cover 300, and the end of the wheel cover 300 is provided with a third transition surface 312, the third transition surface 312 is used for cooperating with the first transition surface 1111 or the second transition surface 1121. Thus, in the process of mounting the wheel cover 300 to the hub 100, the third transition surface 312 and the second transition surface 1121 or the first transition surface 1111 are mutually abutted and cooperated, so that the side wall of the clamping groove 311 is deformed, thereby making the first protrusion 111 or the second protrusion 112 more easily enter the clamping groove 311. By the arrangement of the first transition surface 1111, the second transition surface 1121 and the third transition surface 312, the wheel cover 300 can be more easily mounted to the hub 100.

[0039] With reference to Figure 2 , Figure 3 and Figure 7According to some embodiments of the present application, the side surface of the first protrusion 111 close to the second protrusion 112 is a first clamping surface 1112, and the side surface of the second protrusion 112 close to the first protrusion 111 is a second clamping surface 1122, and the first clamping surface 1112 and the second clamping surface 1122 are both perpendicular to the axis of the shaft hole 110a. In each wheel cover 300, the inner side surface of the clamping groove 311 close to the third transition surface 312 is a third clamping surface 3111, and the third clamping surface 3111 is used for abutting with the first clamping surface 1112 or the second clamping surface 1122. Through the above setting, after the wheel cover 300 is installed to the hub 100, the third clamping surface 3111 can abut with the first clamping surface 1112 or the second clamping surface 1122, so that the wheel cover 300 can be effectively prevented from being separated from the hub 100, and the wheel cover 300 is more firmly installed.

[0040] With reference to Figure 1 , Figure 4 and Figure 5 , according to some embodiments of the present application, the wheel cover 300 comprises a mounting shaft 310, the mounting shaft 310 is inserted into the hollow shaft 110 at one end, the clamping groove 311 is circular, the clamping groove 311 is arranged on the outer peripheral wall of the mounting shaft 310 around the axis of the mounting shaft 310, and the cover 320 is connected to the other end of the mounting shaft 310. In the specific implementation process, the mounting shaft 310 and the cover 320 of the wheel cover 300 can be integrally formed.

[0041] With reference to Figure 1 and Figure 4 , according to some embodiments of the present application, the mounting shaft 310 is hollowly arranged, so as to reduce the consumption material of the wheel cover 300 and reduce the cost. The outer contour of the cover 320 is circular, so as to make the overall appearance of the wheel cover 300 better.

[0042] With reference to Figure 1 and Figure 4 , according to some embodiments of the present application, the side surface of the wheel body 200 away from the hub 100 is provided with a groove 210, and the cover 320 is at least partially located in the groove 210, so that the cover 320 does not hinder the work of the wheel body 200, and the gap between the cover 320 and the wheel body 200 can be elongated and bent, and the possibility of external objects entering between the wheel body 200 and the hollow shaft 110 is further reduced.

[0043] According to some embodiments of the present application, the wheel body 200 is rotatably installed on the hollow shaft 110 through the bearing 400, so as to make the wheel body 200 rotate more smoothly.

[0044] According to some embodiments of the utility model, the hub 100 is rotatably installed with an external connector 500 for external connection, and the rotation axis between the external connector 500 and the hub 100 is arranged at an angle with the rotation axis of the wheel body 200. Through the above arrangement, the wheel body 200 can be omni-directionally rotated relative to the external connector 500.

[0045] In the specific implementation process, the external connector 500 can be externally bolted or connected externally through the plug-in mode.

[0046] Referring to Figure 6 According to some embodiments of the utility model, the first brake mechanism 610 is arranged between the wheel body 200 and the hub 100, the second brake mechanism 620 is arranged between the external connector 500 and the hub 100, and the first brake mechanism 610 and the second brake mechanism 620 are linked and arranged. Through the above arrangement, the wheel body 200 and the external connector 500 can be simultaneously braked, which is convenient to use.

[0047] It should be noted that the brake mechanism is a commonly used technical means in the technical field, and therefore the first brake mechanism 610 and the second brake mechanism 620 are not described in detail herein.

[0048] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0049] The utility model embodiments are described in detail above in combination with the drawings, but the utility model is not limited to the above-described embodiments, and within the knowledge range of the ordinary skilled in the art, various changes can be made without departing from the purpose of the utility model.

Claims

1. A hollow caster wheel characterized by, The application relates to a wheel hub (100) and a wheel cover (300) thereof. The wheel hub (100) comprises a hollow shaft (110) with a shaft hole (110a), the inner wall of the shaft hole (110a) is provided with a first clamping structure and a second clamping structure in an axial direction, the first clamping structure comprises at least one first protrusion (111), all the first protrusions (111) are arranged on the inner wall of the shaft hole (110a) in a circumferential direction of the shaft hole (110a), the second clamping structure comprises at least one second protrusion (112), all the second protrusions (112) are arranged on the inner wall of the shaft hole (110a) in a circumferential direction of the shaft hole (110a), wherein the projection of the first protrusion (111) on the axis direction of the shaft hole (110a) is staggered with the projection of the second protrusion (112) on the axis direction of the shaft hole (110a). Two wheel bodies (200) are arranged on the opposite ends of the hollow shaft (110) in a one-to-one correspondence. Two wheel covers (300) are arranged on the two wheel bodies (200) in a one-to-one correspondence, one end of the wheel cover (300) is provided with a clamping groove (311), the other end of the wheel cover (300) is provided with a cover (320), wherein the two wheel bodies (200) are located between the two covers (320), the first protrusion (111) and the second protrusion (112) are arranged on the clamping groove (311) of the two wheel covers (300) in a one-to-one correspondence.

2. A hollow caster according to claim 1, wherein, The first clamping structure comprises one first protrusion (111), the first protrusion (111) is in an arc shape, the corresponding central angle of the first protrusion (111) is less than or equal to 180 degrees, the second clamping structure comprises one second protrusion (112), the second protrusion (112) is in an arc shape, the corresponding central angle of the second protrusion (112) is less than or equal to 180 degrees.

3. A hollow caster wheel according to claim 1, wherein, The side of the first protrusion (111) away from the second protrusion (112) is a first transition surface (1111), the side of the second protrusion (112) away from the first protrusion (111) is a second transition surface (1121), the first transition surface (1111) and the second transition surface (1121) are arranged in an inclined manner relative to the axis of the shaft hole (110a), in each wheel cover (300), the clamping groove (311) is close to the end of the wheel cover (300), and the end of the wheel cover (300) is provided with a third transition surface (312), the third transition surface (312) is used for cooperating with the first transition surface (1111) or the second transition surface (1121).

4. A hollow caster wheel according to claim 3, wherein, The first protrusion (111) is provided with a first clamping surface (1112) on a side close to the second protrusion (112), and the second protrusion (112) is provided with a second clamping surface (1122) on a side close to the first protrusion (111), wherein the first clamping surface (1112) and the second clamping surface (1122) are both perpendicular to the axis of the shaft hole (110a), and the third clamping surface (3111) in the clamping groove (311) of each wheel cover (300) is arranged on an inner side close to the third transition surface (312) and is used for abutting against the first clamping surface (1112) or the second clamping surface (1122).

5. A hollow caster wheel according to any one of claims 1 to 4, characterized in that The wheel cover (300) comprises a mounting shaft (310) which is inserted into the hollow shaft (110) at one end, and the clamping groove (311) is circular and is arranged on the outer peripheral wall of the mounting shaft (310) around the axis of the mounting shaft (310), and the cover (320) is connected to the other end of the mounting shaft (310).

6. A hollow caster wheel according to claim 5, wherein, The mounting shaft (310) is hollow, and the cover (320) has a circular outer contour.

7. A hollow caster wheel according to claim 6, wherein, The wheel body (200) is provided with a recess (210) on a side away from the hub (100), and the cover (320) is at least partially arranged in the recess (210).

8. The hollow caster wheel of claim 1, wherein, The wheel body (200) is rotatably mounted on the hollow shaft (110) by a bearing (400).

9. The hollow caster wheel of claim 1, wherein, The hub (100) is rotatably mounted with an external connector (500) for external connection, and the rotation axis between the external connector (500) and the hub (100) is arranged at an angle to the rotation axis of the wheel body (200).

10. A hollow caster wheel according to claim 9, wherein, The wheel body (200) and the hub (100) are provided with a first brake mechanism (610), the external connector (500) and the hub (100) are provided with a second brake mechanism (620), and the first brake mechanism (610) and the second brake mechanism (620) are arranged in linkage.

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