CN110901304A

CN110901304A - Caster wheel

Info

Publication number: CN110901304A
Application number: CN201811089413.6A
Authority: CN
Inventors: 林繁斌
Original assignee: Shanghai Shan Peng Industrial Co Ltd
Current assignee: Shanghai Shan Peng Industrial Co Ltd
Priority date: 2018-09-18
Filing date: 2018-09-18
Publication date: 2020-03-24

Abstract

The invention discloses a caster, which belongs to the field of luggage cases and comprises a caster seat, casters and tires, wherein the caster seat is fixedly connected with the luggage case, the casters are rotationally connected with the caster seat, the tires are rotationally connected with the casters, the surface of the casters, which is contacted with the caster seat, is provided with a plurality of first bulges, the side wall of the tires, which is contacted with the casters, is provided with a plurality of second bulges, and the surfaces of the first bulges and the second bulges are curved surfaces; and a circumferential oil groove matched with the second protrusion is formed in the side wall of the caster. The invention has reasonable design and convenient manufacture, can effectively reduce the friction between the caster and the caster seat and between the tire and the caster, and leads the steering of the caster to be more flexible, the dragging of the luggage case to be more labor-saving and the abnormal sound of the rotation of the tire to be more tiny.

Description

Caster wheel

Technical Field

The invention relates to the field of luggage cases, in particular to a caster.

Background

Currently, the common caster wheels on the luggage cases in the market generally comprise a wheel seat which is fixedly connected with the luggage cases; the wheel foot is rotationally connected with the wheel seat; the two tires are rotationally connected to the two sides of the caster through the wheel shafts; and a wheel cover disposed outside the tire.

However, in the caster structure, because the caster foot is in surface contact with the caster seat, the friction force on the contact surface of the caster foot and the caster seat is large, so that the steering of the caster foot is not flexible enough; meanwhile, the tire can generate abnormal sound when rotating, and the abnormal sound is mainly generated by friction when the tire rotates due to the rotating surface of the tire and the wheel axle or the wheel axle and the wheel foot; in addition, the tires are in surface contact with the casters, so that the friction resistance on the contact surface is large, and the luggage case is not labor-saving enough when being dragged.

Disclosure of Invention

The invention aims to provide a caster, which aims to solve the problems that the caster on a luggage case in the prior art is not flexible enough in steering and is easy to make abnormal sound.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides a caster, includes wheel seat, caster and tire, wheel seat and suitcase fixed connection, and the caster rotates with the wheel seat to be connected, and the tire rotates with the caster to be connected, the caster contacts with the wheel seat be equipped with the first arch of a plurality of on the surface, it is protruding to be equipped with a plurality of second on the lateral wall of tire and caster contact, first arch, the bellied surface of second are the curved surface.

Preferably, the plurality of first bulges are uniformly distributed on the same circumference of the surface of the caster, and the axis of the circumference where the first bulges are located is superposed with the rotation axis of the caster; the plurality of second bulges are uniformly distributed on the same circumference of the side wall of the tire, and the axis of the circumference where the second bulges are located is coaxial with the tire.

Preferably, the first protrusion and the second protrusion are both spherical.

Preferably, the height of the first bulge is 0.3mm, and the diameter of the first bulge is 2.7 mm; the height of the second bulge is 0.3mm, and the diameter of the second bulge is 2 mm.

Preferably, the first protrusion and the second protrusion are polished to be bright.

Furthermore, a circumferential oil groove matched with the second protrusion is formed in the side wall of the caster.

Furthermore, radial oil grooves are formed in the tire and/or the caster, and the radial oil grooves are communicated with contact surfaces of the tire and the caster, which rotate mutually.

Preferably, the tire comprises a wheel core fixedly arranged at the center, a wheel shaft is fixedly connected to the wheel core, a shaft hole is formed in the end face of the wheel shaft, a wheel pin matched with the shaft hole shaft is fixedly arranged on the wheel foot, and the wheel core, the wheel shaft and the shaft hole are coaxial; the radial oil groove is formed in the wheel axle or the wheel core, and the second protrusion is arranged on the end face of the wheel axle.

Preferably, the tire comprises a wheel core fixedly arranged at the center, a bearing sleeve is fixedly embedded on the wheel core, wheel pins matched with a bearing sleeve hole shaft are fixedly arranged on the wheel legs, and the wheel core and the bearing sleeve are coaxial; the radial oil groove is formed in the bearing sleeve or the wheel core, and the second protrusion is arranged on the end face of the bearing sleeve.

Preferably, the shaft hole or the bearing sleeve is manufactured by a microcellular foaming technology in an injection molding process.

By adopting the technical scheme, the first bulge with the curved surface is arranged on the surface, so that the contact surface of the caster and the caster seat is in line contact when the caster rotates, the friction force when the caster rotates is effectively reduced, and the flexibility of rotation is improved; and because the second bulge with the surface in the shape of a curved surface is arranged, the contact surface of the tire and the caster is in line contact when the tire rotates, the friction force of the tire during rotation is effectively reduced, and abnormal sound during rotation can be effectively reduced.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a partial cross-sectional view of the present invention;

fig. 3 is a sectional view taken along line a-a of fig. 2.

In the figure, 1-wheel seat, 2-wheel foot, 3-tyre, 4-first projection, 5-second projection, 6-circumferential oil groove, 7-wheel core, 8-wheel shaft and 9-wheel nail.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1-3, a caster comprises a caster seat 1, a caster 2 and a tire 3, wherein the top surface of the caster seat 1 is used for being fixedly connected with a luggage case, and the top surface of the caster 2 is rotatably connected with the bottom surface of the caster seat 1; the surface (namely the top surface of the caster 2) of the caster 2, which is contacted with the caster seat 1, is provided with a plurality of first bulges 4, the first bulges 4 are uniformly distributed on the same circumference of the surface of the caster 2, the axis of the circumference where the first bulges 4 are located is superposed with the rotation axis of the caster 2, the surface of the first bulges 4 is a curved surface, and the arrangement of the first bulges 4 in the curved surface shape can change the surface contact of the caster 2 and the tire 1 into the line contact when the caster turns, so that the friction force can be effectively reduced, and the rotation flexibility of the caster 2 is improved; in this embodiment, the first protrusion 4 is preferably spherical, the first protrusion 4 is a part of a sphere with a diameter of 2mm, the height of the first protrusion 4 is 0.3mm, the diameter (i.e., the width) is 2.7mm, and the surface of the first protrusion 4 is polished to be bright.

The tires 3 are rotatably connected with the caster 2, in the embodiment, the number of the tires 3 is two, the two tires 3 are respectively rotatably connected with two sides of the caster 2, each tire 3 comprises a wheel core 7 at the center, a wheel shaft 8 is fixedly arranged on the side wall of the wheel core 7, which is opposite to the caster 2, a shaft hole is arranged at the center of the end surface of the free end of the wheel shaft 8, wheel nails 9 matched with the shaft holes of the shaft hole are fixedly arranged at two sides of the caster 2, and the wheel nails 9, the shaft holes, the wheel shafts 8 and the wheel cores 7 are coaxial;

meanwhile, the end face of the free end of the wheel shaft 8 is also provided with a plurality of second bulges 5, the second bulges 5 are uniformly distributed on the same circumference of the end face of the wheel shaft 8, and the axis of the circumference where the second bulges 5 are located is coaxial with the wheel shaft 8; the surface of the second bulge 5 is a curved surface, and the arrangement of the second bulge 5 in the shape of the curved surface can change the surface contact of the wheel shaft 8 and the caster 2 into the line contact when the tire 3 rotates, so that the friction force can be effectively reduced, and the abnormal sound can be reduced; in this embodiment, the second protrusion 5 is preferably spherical, the second protrusion 5 is a part of a sphere with a diameter of 1.8mm, the height of the second protrusion 5 is 0.3mm, the diameter (i.e., the width) is 2mm, and the surface of the second protrusion 5 is polished to be bright.

The shaft hole is manufactured by adopting a microcellular foaming technology in an injection molding process, and the technology can control the roundness tolerance of the shaft hole within +/-0.02 mm and the size tolerance within +/-0.02 mm; the smaller tolerance can effectively reduce the runout of the tire 3 during rotation, and can effectively reduce the friction and abnormal sound

Example two

The difference from the first embodiment is that: in order to further reduce friction and abnormal noise, in the embodiment, a circumferential oil groove 6 matched with the second protrusion 5 is arranged on the side wall of the caster 2.

The wheel axle 8 or the wheel core 7 is provided with a radial oil groove (not shown in the figure), and the radial oil groove is communicated with the rotating surface of the wheel nail 9 and the wheel axle 8 which are contacted with each other.

The setting of circumference oil groove 6 and radial oil groove plays the convenient friction surface to tire 3 and caster 2 mutual contact and carries out the lubricated effect of oiling.

EXAMPLE III

The difference between the first embodiment and the second embodiment is that: the rotating shaft 8 is replaced by a bearing sleeve, and the bearing sleeve is provided with an inner hole wall and can be matched with a wheel nail 9 in a hole-shaft mode; in this embodiment, the bearing sleeve is embedded in the wheel core 7; similarly, the bearing sleeve is manufactured by adopting a microcellular foaming technology in an injection molding process, and the roundness tolerance and the size tolerance of the inner hole wall of the bearing sleeve can be controlled within +/-0.02 mm and +/-0.02 mm by the technology; the jump of 3 rotations of less tolerances can effectual reduction tires, can effectual reduction friction and abnormal sound.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims

1. The utility model provides a truckle, includes wheel seat, caster and tire, wheel seat and suitcase fixed connection, and the caster rotates with the wheel seat to be connected, and the tire rotates with the caster to be connected its characterized in that: the tire is characterized in that a plurality of first bulges are arranged on the surface of the caster, which is in contact with the caster seat, a plurality of second bulges are arranged on the sidewall of the tire, which is in contact with the caster, and the surfaces of the first bulges and the second bulges are curved surfaces.

2. The caster according to claim 1, wherein: the first bulges are uniformly distributed on the same circumference of the surface of the caster, and the axis of the circumference where the first bulges are located is superposed with the rotation axis of the caster; the plurality of second bulges are uniformly distributed on the same circumference of the side wall of the tire, and the axis of the circumference where the second bulges are located is coaxial with the tire.

3. The caster according to claim 1, wherein: the first bulge and the second bulge are both spherical.

4. A castor according to claim 3, wherein: the height of the first bulge is 0.3mm, and the diameter of the first bulge is 2.7 mm; the height of the second bulge is 0.3mm, and the diameter of the second bulge is 2 mm.

5. The caster according to claim 1, wherein: and the first bulges and the second bulges are polished to form bright surface treatment.

6. A castor according to any one of claims 1 to 5, wherein: and a circumferential oil groove matched with the second protrusion is formed in the side wall of the caster.

7. The caster according to claim 6, wherein: the tire and/or the caster are/is provided with radial oil grooves which are communicated with the contact surface of the tire and the caster which rotate mutually.

8. The caster according to claim 7, wherein: the tire comprises a wheel core fixedly arranged at the center, a wheel shaft is fixedly connected to the wheel core, a shaft hole is formed in the end face of the wheel shaft, a wheel pin matched with the shaft hole shaft is fixedly arranged on the wheel foot, and the wheel core, the wheel shaft and the shaft hole are coaxial; the radial oil groove is formed in the wheel axle or the wheel core, and the second protrusion is arranged on the end face of the wheel axle.

9. The caster according to claim 7, wherein: the tire comprises a wheel core fixedly arranged at the center, a bearing sleeve is fixedly embedded on the wheel core, wheel pins matched with a bearing sleeve hole shaft are fixedly arranged on the wheel legs, and the wheel core and the bearing sleeve are coaxial; the radial oil groove is formed in the bearing sleeve or the wheel core, and the second protrusion is arranged on the end face of the bearing sleeve.

10. A castor according to claim 8 or 9, wherein: the shaft hole or the bearing sleeve is manufactured by a micropore foaming technology in an injection molding process.