阅读说明：本技术 一种包塑轴承及其制作方法 (Plastic-coated bearing and manufacturing method thereof ) 是由 熊平 于 2020-03-17 设计创作，主要内容包括：本发明属于轴承领域,具体涉及一种包塑轴承及其制作方法。通过将包塑轴承的轮体设计为具有第一塑料体和第二塑料体的结构,第一塑料体和第二塑料体可分两次注塑,从而使得第一次注塑第一塑料体时胶量较少,可有效的避免第一塑料体冷却过程中导致安装孔过度缩小(过度挤压轴承)。进一步的,单独注塑第一塑料体时可以先将第一塑料体注塑成更加致密的结构,从而提高包塑轴承轮体的硬度,抗冲击力和耐摩擦等性能。而将第二塑料体设计为包覆于第一塑料体外,进一步使得轴承、第一塑料体和第二塑料体形成结构稳固结实的包塑轴承。(The invention belongs to the field of bearings, and particularly relates to a plastic-coated bearing and a manufacturing method thereof. The wheel body design through will wrap the plastics bearing is for having the structure of first plastic body and second plastic body, and first plastic body and second plastic body can be moulded plastics twice to it is less to make the first plastic body of moulding plastics time gum volume, can effectually avoid leading to the mounting hole excessively to reduce (excessively extrudeing the bearing) in the first plastic body cooling process. Furthermore, when the first plastic body is independently injected, the first plastic body can be injected into a more compact structure, so that the hardness, impact resistance, friction resistance and other performances of the plastic coated bearing wheel body are improved. The second plastic body is designed to be coated outside the first plastic body, so that the bearing, the first plastic body and the second plastic body form the plastic-coated bearing with a stable and firm structure.)

1. The utility model provides a package is moulded bearing, includes the bearing and locates the outer wheel body of bearing, its characterized in that, the wheel body includes:

the bearing comprises a first plastic body, a second plastic body and a bearing seat, wherein a mounting hole is formed in the first plastic body, and the bearing seat is fixed in the mounting hole;

the second plastic body is wrapped outside the first plastic body.

2. The plastic-covered bearing according to claim 1, wherein the first plastic body is further formed with one or more auxiliary holes extending through the first plastic body; the second plastic body comprises a filling part for filling the auxiliary hole and an outer wrapping part wrapped on the first plastic body.

3. The plastic-coated bearing according to claim 2, wherein the auxiliary hole is formed in a wall of the mounting hole so as to communicate with the mounting hole.

4. The plastic-coated bearing according to claim 3, wherein the auxiliary hole is completely communicated with the hole wall of the mounting hole along the axial direction, so that the hole wall of the mounting hole forms a broken hole wall or a plurality of spaced hole walls.

5. The plastic-coated bearing according to claim 2, wherein the first plastic body is provided with a convex ring in the middle of the outer side surface, the second plastic body is provided with an annular track groove on the outer side, and the convex ring is positioned at the bottom of the annular track groove.

6. The plastic-coated bearing according to any one of claims 2 to 5, wherein a concave-convex anti-slip structure is arranged between the outer side surface of the first plastic body and the cladding part.

7. The plastic-coated bearing according to claim 6, wherein the anti-separation structure comprises annular grooves which are arranged on the outer side surface of the first plastic body and are symmetrically arranged relative to the annular protrusions, and annular snap rings which are arranged on the cladding part and are clamped in the annular clamping grooves.

8. The plastic-covered bearing according to any one of claims 2 to 5, wherein a plurality of bosses are formed on an end surface of the first plastic body, and the cladding portion further fills a region between the plurality of bosses.

9. The plastic coated bearing of claim 8, wherein the end surfaces of the bosses are flush with the outer surface of the cladding filling the areas between the bosses.

10. A plastic-covered bearing according to any one of claims 2 to 5, wherein the first and second plastic bodies are made of the same plastic, and the density of the first plastic body is greater than the density of the second plastic body.

11. The manufacturing method of the plastic coated bearing is characterized by comprising the following steps of:

injection molding a first plastic body to form a mounting hole on the first plastic body;

securing a bearing within the mounting hole;

and injection molding a second plastic body to wrap the first plastic body with the second plastic body.

12. The method of claim 11, wherein the injection molding of the first plastic body further forms one or more auxiliary holes in the first plastic body, the auxiliary holes penetrating the first plastic body; the second plastic body is also caused to fill the one or more auxiliary holes when the second plastic body is injection molded.

13. The method of claim 12, wherein the auxiliary hole is further formed through the mounting hole in the wall of the mounting hole during injection molding of the first plastic body.

Technical Field

The invention belongs to the field of door and window hardware accessories, and particularly relates to a plastic-coated bearing and a manufacturing method thereof.

Background

The plastic-coated bearing generally means that a layer of plastic is coated outside the bearing, and the plastic material is generally nylon PA, polyformaldehyde POM, engineering plastics polypropylene and PP. The outer plastic has certain hardness, impact resistance, friction resistance and self-lubricating property. The plastic coated bearing has wide application, and has wide application in mechanical equipment, industrial production lines, furniture and hardware fittings. The plastic-coated bearing can be made into different shapes according to different application purposes, such as a pulley with a groove, a roller without a groove and the like.

The existing plastic-coated bearing is manufactured by directly injection molding outside the bearing by adopting an injection molding process to form a plastic-coated layer. The injection molding pressure is improved, so that the outer plastic coating layer becomes more compact (higher in density), and the hardness, impact resistance, friction resistance and other properties of the outer plastic coating layer are improved; however, the injection amount of the outer plastic layer is increased due to the excessively high injection pressure, and the increase of the injection amount causes the outer plastic layer to shrink excessively in the cooling process so as to excessively extrude the bearing, thereby causing the clamping stagnation or locking of the bearing. Therefore, the hardness, impact resistance, friction resistance and other performances of the outer plastic coating layer of the conventional plastic coated bearing are difficult to improve.

Disclosure of Invention

The invention aims to solve the technical problems of the prior art and provides a plastic-coated bearing and a manufacturing method thereof so as to solve the defects that the hardness, impact resistance, friction resistance and other properties of an outer plastic coating layer of the prior plastic-coated bearing are difficult to improve.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a package is moulded bearing, includes the bearing and locates the outer wheel body of bearing, the wheel body includes:

the bearing comprises a first plastic body, a second plastic body and a bearing seat, wherein a mounting hole is formed in the first plastic body, and the bearing seat is fixed in the mounting hole;

the second plastic body is wrapped outside the first plastic body.

Further preferred embodiments of the present invention are: one or more auxiliary holes are formed in the first plastic body and penetrate through the first plastic body; the second plastic body comprises a filling part for filling the auxiliary hole and an outer wrapping part wrapped on the first plastic body.

Further preferred embodiments of the present invention are: the auxiliary hole is communicated with the mounting hole on the hole wall of the mounting hole.

Further preferred embodiments of the present invention are: the auxiliary hole is completely communicated with the hole wall of the mounting hole along the axial direction, so that the hole wall of the mounting hole forms a broken hole wall or a plurality of spaced hole walls.

Further preferred embodiments of the present invention are: the middle of the outer side face of the first plastic body is provided with a convex ring, the outer side of the second plastic body is provided with an annular track groove, and the convex ring is located at the bottom of the annular track groove.

Further preferred embodiments of the present invention are: and a concave-convex anti-falling structure is arranged between the outer side surface of the first plastic body and the second plastic body.

Further preferred embodiments of the present invention are: the anti-disengaging structure comprises an annular groove and an annular snap ring, wherein the annular groove is formed in the outer side surface of the first plastic body and symmetrically arranged in the annular protrusion, the annular groove is formed in the second plastic body, and the annular snap ring is clamped in the annular snap groove.

Further preferred embodiments of the present invention are: the end of the first plastic body is formed with a plurality of bosses, and the second plastic body also fills the areas between the bosses.

Further preferred embodiments of the present invention are: the end surfaces of the bosses are flush with the surface of the second plastic body in the areas filled among the bosses.

The other technical scheme adopted by the invention for solving the technical problem is as follows: the manufacturing method of the plastic coated bearing comprises the following steps:

injection molding a first plastic body to form a mounting hole on the first plastic body;

securing a bearing within the mounting hole;

and injection molding a second plastic body to wrap the first plastic body with the second plastic body.

Further preferred embodiments of the present invention are: when the first plastic body is subjected to injection molding, one or more auxiliary holes are formed in the first plastic body and penetrate through the first plastic body; the second plastic body is also caused to fill the one or more auxiliary holes when the second plastic body is injection molded.

Further preferred embodiments of the present invention are: and when the first plastic body is subjected to injection molding, the auxiliary hole is communicated with the mounting hole on the hole wall of the mounting hole.

The plastic-coated bearing has the beneficial effects that the wheel body of the plastic-coated bearing is designed to have the structure of the first plastic body and the second plastic body, and the first plastic body and the second plastic body can be subjected to two-time injection molding, so that the glue amount is less when the first plastic body is subjected to the first injection molding, and the phenomenon that the mounting hole is excessively reduced (the bearing is excessively extruded) in the cooling process of the first plastic body can be effectively avoided. Furthermore, when the first plastic body is independently injected, the first plastic body can be injected into a more compact structure, so that the hardness, impact resistance, friction resistance and other performances of the plastic coated bearing wheel body are improved. The second plastic body is designed to be coated outside the first plastic body, so that the bearing, the first plastic body and the second plastic body form the plastic-coated bearing with a stable and firm structure.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic perspective view of a plastic-coated bearing according to a first embodiment of the invention;

FIG. 2 is a schematic diagram of an exploded structure of a plastic-coated bearing according to a first embodiment of the present invention;

FIG. 3 is a schematic perspective view of a first plastic body according to a first embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a first plastic body according to a first embodiment of the invention;

FIG. 5 is a perspective view of a second plastic body according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a second plastic body according to an embodiment of the invention;

fig. 7 is a schematic cross-sectional view of a plastic-coated bearing according to a first embodiment of the invention.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.