Rubber coating forming screw rod

Abstract

The invention relates to the technical field of vehicle accessories, in particular to a rubber coating forming lead screw which comprises a rod body, a metal insert and a guide ring, the rod body is formed by non-metal materials in an injection molding mode, external threads are formed on the outer wall of the rod body, a buckle assembly is formed at the first end of the rod body, the metal insert is connected to the second end of the rod body, and the guide ring is connected to the metal insert. The metal insert comprises an external connection section matched with an external part and a connection section enveloped and connected by the rod body, and the connection section forms a mold part for injection molding of the rod body, so that the rod body and the metal insert are fixed together after injection molding is completed; and the guide ring is rotatably clamped at the first end of the rod body through the buckle assembly. The technical problems that in the prior art, a lead screw is high in cost, and noise is generated are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle accessories, and specifically relates to a rubber-coated formed lead screw. Background Art

[0002] The existing lead screw body is formed by rolling a stainless steel material into a thread shape, then turning at both ends, and knurling at the head. After completion, a guide ring is assembled at one end. In order to limit the guide ring, a metal retaining ring also needs to be configured. The metal retaining ring is riveted to the end of the lead screw by a rivet. Moreover, for the processing of the original lead screw, the rolling method is adopted, and materials can only be selected from those with good ductility such as stainless steel and medium-low carbon steel, and the application range of materials is greatly limited. In this mode, the production cost of the lead screw is high. For example, the stainless steel rolling process with high use cost is adopted, and for another example, additional metal retaining rings and rivets are required to assemble the guide ring through the riveting process; at the same time, after the lead screw body is assembled with other parts, since the threaded mating parts of the lead screw are all metals, more noise will be generated. Summary of the Invention

[0003] In order to solve the technical problems of high cost and noise generation of the lead screw in the prior art, the present application proposes a rubber-coated formed lead screw, which solves the above technical problems.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] The present invention provides a rubber-coated formed lead screw, including: a rod body, the rod body is injection-molded from a non-metallic material, an external thread is formed on the outer wall of the rod body, and a snap-fit component is formed at the first end of the rod body; a metal insert, the metal insert is connected to the second end of the rod body, the metal insert includes an external connection section for cooperating with external parts and a connection section enveloped and connected by the rod body, and the connection section is formed as a part of the mold for injecting the rod body, so that the rod body and the metal insert are fixed together when the injection molding is completed; a guide ring, the guide ring is rotatably snap-fitted to the first end of the rod body through the snap-fit component.

[0006] The encapsulated formed lead screw of the present invention has a rod body injection-molded from a non-metallic material. The external threads required for the rod body are formed by injection molding of non-metallic segments. Compared with the more costly stainless steel rolling process, the corresponding production process cost is reduced. At the same time, compared with the metal friction of the lead screw drive, the non-metallic material can significantly reduce the probability of noise generation. Moreover, the weight of the rod body is reduced by changing from metal to plastic. The first end of the rod body directly forms a snap component by injection molding to facilitate the installation of the guide ring. Compared with the existing method of assembling using a metal retaining ring and rivets through a riveting process, the snap component in the present invention can be directly snapped into the guide ring, and the assembly process is simpler. The second end of the rod body of the encapsulated formed lead screw of the present invention is connected to a metal insert. The metal insert has an external connection section that cooperates with external parts to ensure that the inherent strength here is not weakened. At the same time, the metal insert also has a connection section that is enveloped and connected by the rod body. The connection section serves as a part of the mold before the injection molding of the rod body, so that the rod body and the metal insert are directly fixed together when the injection molding is completed, ensuring the connection strength between the metal insert and the rod body while simplifying the assembly process and reducing the production cost. In summary, the encapsulated formed lead screw of the present invention solves the technical problems of high cost and noise generation in the prior art lead screws.

[0007] Further, the snap component includes a plurality of hooks distributed in a ring shape, and a gap is formed between adjacent hooks.

[0008] Further, at least part of the area where the first end of the rod body is sleeved by the guide ring is a circumferentially complete shaft section.

[0009] Further, a limiting step recessed towards the axis is formed on the connection section of the metal insert for the injection molding material of the rod body before molding to enter and form a mutually cooperating limiting ring.

[0010] Further, the outer wall of the connection section of the metal insert is a rough surface.

[0011] Further, the outer wall of the connection section of the metal insert is knurled to form the rough surface.

[0012] Further, a through hole axially penetrating the rod body is formed on the rod body.

[0013] Further, the injection molding material of the rod body is nylon material, POM material or other injection molding materials.

[0014] Further, the metal insert is made by die casting, powder metallurgy or machining.

[0015] Based on the above technical solutions, the technical effects that the present invention can achieve are:

[0016] The encapsulated forming lead screw of the present invention has a rod body injection-molded from a non-metallic material. The required external threads of the rod body are formed by injection molding of non-metallic segments. Compared with the stainless steel rolling process with higher costs, the corresponding production process costs are reduced. At the same time, compared with the metal friction of the lead screw drive, the non-metallic material can significantly reduce the probability of noise generation. Moreover, the weight of the rod body is reduced by changing from metal to plastic. The first end of the rod body directly forms a snap-fit component by injection molding to facilitate the installation of the guide ring. Compared with the prior art method of assembling using a metal retaining ring and rivets through a riveting process, the snap-fit component in the present invention can be directly snapped into the guide ring, and the assembly process is simpler. The second end of the rod body of the encapsulated forming lead screw of the present invention is connected to a metal insert. The metal insert has an external connection segment for cooperating with external parts to ensure that the inherent strength here is not weakened. At the same time, the metal insert also has a connection segment enveloped and connected by the rod body. The connection segment acts as a part of the mold before the injection molding of the rod body, so that the rod body and the metal insert are directly fixed together when the injection molding is completed, ensuring the connection strength between the metal insert and the rod body while simplifying the assembly process and reducing the production cost. In summary, the encapsulated forming lead screw of the present invention solves the technical problems of high cost and noise generation of the lead screw in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic diagram of the overall structure after the cooperation of the rod body and the metal insert of the encapsulated forming lead screw of the present invention;

[0018] Figure 2 FIG. is a partial schematic diagram of the cooperation between the rod body and the metal insert of the encapsulated forming lead screw of the present invention;

[0019] Figure 3 FIG. is a schematic diagram of the metal insert of the encapsulated forming lead screw of the present invention;

[0020] Figure 4 FIG. is a partial schematic diagram of the cooperation between the rod body and the guide ring of the encapsulated forming lead screw of the present invention;

[0021] Figure 5 FIG. is a partial schematic diagram of the rod body of the encapsulated forming lead screw of the present invention at the snap-fit component.

[0022] Wherein:

[0023] 1 - rod body, 11 - external thread, 12 - snap-fit component, 121 - hook, 13 - shaft section, 14 - limit ring, 15 - through hole;

[0024] 2 - metal insert, 21 - external connection segment, 22 - connection segment, 221 - limit step, 222 - rough surface;

[0025] 3 - guide ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation on the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0027] As Figures 1-5 shown, the present invention provides a plastic-encapsulated forming lead screw, including a rod body 1, a metal insert 2, and a guide ring 3. The rod body 1 is injection-molded from a non-metallic material. An external thread 11 is formed on the outer wall of the rod body 1. A snap component 12 is formed at the first end of the rod body 1. The metal insert 2 is connected to the second end of the rod body 1. The metal insert 2 includes an external connection section 21 that cooperates with external parts and a connection section 22 that is enveloped and connected by the rod body 1. The connection section 22 forms a part of the mold when the rod body 1 is injection-molded, so that the rod body 1 and the metal insert 2 are fixed together when the injection molding is completed. The guide ring 3 is rotatably clamped to the first end of the rod body 1 through the snap component 12.

[0028] For the plastic-encapsulated forming lead screw of the present invention, the rod body 1 is injection-molded from a non-metallic material, and the required external thread 11 of the rod body 1 is formed by injection molding of a non-metallic section. Compared with the stainless steel rolling process with higher cost, the corresponding production process cost is reduced. At the same time, compared with the metal friction of the lead screw transmission, the non-metallic material can significantly reduce the probability of noise generation. Moreover, the weight of the rod body 1 is reduced by changing from metal to plastic. The snap component 12 is directly formed at the first end of the rod body 1 by injection molding to facilitate the installation of the guide ring 3. Compared with the prior art method of assembling using a metal retaining ring and rivets through a riveting process, the snap component 12 in the present invention can be directly snapped into the guide ring 3, and the assembly process is simpler. The second end of the rod body 1 of the plastic-encapsulated forming lead screw of the present invention is connected to the metal insert 2. The metal insert 2 has an external connection section 21 that cooperates with external parts to ensure that the inherent strength here is not weakened. At the same time, the metal insert 2 also has a connection section 22 that is enveloped and connected by the rod body 1. The connection section 22 serves as a part of the mold before the injection molding of the rod body 1, so that the rod body 1 and the metal insert 2 are directly fixed together when the injection molding is completed, ensuring the connection strength between the metal insert 2 and the rod body 1 while simplifying the assembly process and reducing the production cost. In summary, the plastic-encapsulated forming lead screw of the present invention solves the technical problems of high cost and noise generation of the lead screw in the prior art.

[0029] In a specific embodiment of the present invention, the snap component 12 includes a plurality of hooks 121 distributed in a ring shape. A gap is formed between adjacent hooks 121. The guide ring 3 will press the hooks 121 during the clamping process, and the existence of the gap enables the hooks 121 to deform and reset.

[0030] In a specific embodiment of the present invention, at least a part of the region where the first end of the rod body 1 is sleeved by the guiding ring 3 is a circumferentially complete shaft section 13. In this way, there is a mating shaft section 13 without a gap between the inner wall of the guiding ring 3 and the outer wall of the rod body 1, ensuring the strength of the first end of the rod body 1 and thus ensuring stability.

[0031] In a specific embodiment of the present invention, a limiting step 221 recessed towards the axis is formed on the connecting section 22 of the metal insert 2, so that the injection molding material of the rod body 1 before molding can enter to form a mutually cooperating limiting ring 14. The limiting step 221 of the metal insert 2 and the limiting ring 14 of the rod body 1 cooperate for limiting, preventing the metal insert 2 from disengaging from the rod body 1 and ensuring the firmness of the assembly.

[0032] Furthermore, the outer wall of the connecting section 22 of the metal insert 2 is a rough surface 222. The injection molding material of the rod body 1 before molding can enter the recesses of the rough surface 222 on the outer wall of the connecting section 22, making the fit between the two more firm.

[0033] In a specific embodiment of the present invention, the outer wall of the connecting section 22 of the metal insert 2 is knurled to form a rough surface 222.

[0034] In a preferred embodiment of the present invention, a through hole 15 axially penetrating the rod body 1 is formed on the rod body 1. On the one hand, the injection molding material required for the rod body 1 can be saved. More importantly, by designing the filling thickness of the injection molding material to be lower, the generation of bubbles during the injection molding process can be reduced. At the same time, the dimensional change affected by the thermal expansion and contraction phenomenon after the injection molding material cools is less, so that the outer shape size of the rod body 1 after molding is more accurate, and the injection molding difficulty is reduced.

[0035] In a preferred embodiment of the present invention, the injection molding material of the rod body 1 is nylon material, POM material or other injection molding materials.

[0036] In a preferred embodiment of the present invention, the metal insert can be realized by low-cost processing methods such as die casting, powder metallurgy, and machining, and there are no restrictions on the material, reducing the production cost.

[0037] It should be understood that the above-described specific embodiments are only used to explain the present invention and are not used to limit the present invention. Obvious changes or variations derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A rubber-coated forming lead screw, characterized in that, Comprising: A rod body (1), the rod body (1) is injection molded from a non-metallic material, an external thread (11) is formed on the outer wall of the rod body (1), and a snap component (12) is formed at the first end of the rod body (1); A metal insert (2), the metal insert (2) is connected to the second end of the rod body (1), the metal insert (2) includes an external connection section (21) for cooperating with an external part and a connection section (22) enveloped and connected by the rod body (1), and the connection section (22) is formed as a part of the mold when injecting the rod body (1), so that the rod body (1) and the metal insert (2) are fixed together when the injection molding is completed; A guide ring (3), the guide ring (3) is rotatably snapped to the first end of the rod body (1) through the snap component (12).

2. The overmolded lead screw according to claim 1, wherein, The snap component (12) includes a plurality of hooks (121) distributed in a ring shape, and a gap is formed between adjacent hooks (121).

3. The overmolded lead screw according to claim 2, wherein, At least part of the area of the first end of the rod body (1) sleeved by the guide ring (3) is a circumferentially complete shaft section (13).

4. The overmolded lead screw according to claim 1, wherein, A limiting step (221) recessed towards the axis is formed on the connection section (22) of the metal insert (2) for the injection material of the rod body (1) before molding to enter and form a mutually cooperating limiting ring (14).

5. The encapsulated forming lead screw according to claim 1, wherein The outer wall of the connection section (22) of the metal insert (2) is a rough surface (222).

6. The overmolded lead screw according to claim 5, wherein, The outer wall of the connection section (22) of the metal insert (2) is knurled to form the rough surface (222).

7. The encapsulated forming lead screw according to claim 1, wherein, A through hole (15) axially penetrating the rod body (1) is formed on the rod body (1).

8. The overmolded lead screw according to claim 1, wherein, The injection material of the rod body (1) is nylon material, POM material or other injection materials.

9. The encapsulated forming lead screw according to claim 1, wherein The metal insert (2) is made by die casting, powder metallurgy or machining.

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