Combined strength compensation gear structure

Abstract

The utility model belongs to the technical field of gears, and particularly discloses a combined type strength compensation gear structure which comprises a plastic gear and two sets of plastic gaskets, the plastic gear is provided with a first end face and a second end face which are oppositely arranged, and the first end face and the second end face are respectively provided with a concave cavity. The plastic washers are clamped and pressed in the concave cavities through anti-rotation structures respectively, and the end faces, exposed out of the plastic gear, of the plastic washers form shaft shoulders. The plastic gasket replaces an original plastic gear to bear the axial load of the plastic gear through the stress of the end faces and the webs, the problems that the two end faces of the plastic gear are abraded, the webs are damaged and the like are solved, the performance of the product is improved, the service life of the product is prolonged, meanwhile, the plastic gasket better limits the axial movement of the plastic gear, and the transmission precision and stability of the plastic gear are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gears, and particularly relates to a combined strength compensation gear structure. Background Art

[0002] With the continuous emergence of new plastic materials, different auxiliary materials are added to change the performance of pure plastic gears, improve the mechanical properties and service life of the gears, and make plastic gears widely replace metal gears and be applied in industries such as household appliances, automobiles, medical equipment, and industrial machinery.

[0003] In the side door opening and closing system of the automotive industry, an electric limiter is used. During the process of opening and closing the door, when the motor is blocked, the axial load is large, and the maximum axial load can reach 9000N. The web-type plastic gear is applied to the side door opening and closing system of the automobile due to its advantages such as strong load-bearing capacity, smooth transmission, light weight, and good corrosion resistance.

[0004] The web-type plastic gear is directly connected to the transmission part. In actual use, the web-type plastic gear has the following problems: when impacted, the two end faces of the web-type plastic gear are prone to wear and the web is damaged due to force, directly affecting the performance and service life of the gear. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a combined strength compensation gear structure to avoid problems such as wear on the two end faces and damage to the web due to direct force during the use of the web-type plastic gear, and improve the performance and service life of the product.

[0006] The purpose of the utility model is realized through the following technical solution. A combined strength compensation gear structure includes:

[0007] A plastic gear, the two opposite end faces on both sides of the plastic gear are respectively a first end face and a second end face, and concave cavities are respectively provided on the first end face and the second end face;

[0008] Two groups of plastic washers, the plastic washers are respectively clamped in the concave cavities through anti-rotation structures, and the end faces of the plastic washers exposed outside the plastic gear form shaft shoulders.

[0009] Preferably, the anti-rotation structure is that a strip groove communicated with the concave cavity is provided on the plastic gear, and a boss matched with the strip groove is provided on the plastic washer, and the boss is sleeved in the strip groove.

[0010] Preferably, the shape of the strip groove is one of an arc shape, a dovetail shape or a triangle shape, and the boss is correspondingly matched in shape.

[0011] Preferably, multiple groups of strip grooves are provided and are arranged at intervals along the circumferential direction of the concave cavity, and multiple groups of bosses are correspondingly provided.

[0012] Preferably, the strip grooves on the first end face and the strip grooves on the second end face are arranged in a staggered manner.

[0013] Preferably, the material of the plastic washer is polyamide resin added with glass fiber, and the material of the plastic gear is polyoxymethylene.

[0014] Due to the adoption of the above technical solution, the utility model has the following advantages: The plastic washer is pressed into the plastic gear through the anti-rotation structure, so that the plastic washer and the plastic gear are combined together. The plastic washer is exposed on the end face of the plastic gear to form a shaft shoulder. The plastic washer bears the axial load force of the plastic gear, avoiding problems such as easy wear on both end faces and web breakage when the web-type plastic gear is directly stressed, thereby improving the service life of the plastic gear. Brief Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present utility model, the drawings required for use in the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0016] Figure 1 is a schematic structural diagram of a combined strength compensation gear structure of the present utility model;

[0017] Figure 2 is a combined schematic diagram of the plastic gear and the plastic washer of the present utility model.

[0018] Reference Numerals:

[0019] 1 - plastic gear, 11 - first end face, 12 - second end face, 13 - concave cavity, 14 - strip groove,

[0020] 2 - plastic washer, 21 - boss. Detailed Description of the Embodiments

[0021] Please refer to Figure 1 , a combined strength compensation gear structure, including a plastic gear 1 and two groups of plastic washers 2.

[0022] On both sides of the plastic gear 1, the opposing end faces are respectively the first end face 11 and the second end face 12, and concave cavities 13 are respectively provided on the first end face 11 and the second end face 12; each group of plastic washers 2 are respectively clamped in the concave cavities 13 through anti-rotation structures, and the end faces of the plastic washers 2 exposed outside the plastic gear 1 form shaft shoulders. Specifically, the teeth of the plastic gear 1 are arranged between the first end face 11 and the second end face 12, and the plastic washer 2 is made of a material with better wear resistance than the plastic gear 1. Specifically, the material of the plastic gear 1 is usually polyoxymethylene, and the material of the plastic washer 2 is polyamide resin added with glass fiber. The materials of the plastic gear 1 and the plastic washer 2 both adopt existing technologies, and glass fiber is added to the polyamide resin raw material to enhance its mechanical properties. The plastic washer 2 and the plastic gear 1 adopt a split structure and different materials are selected. The plastic gear 1 can adopt a low-cost material that meets the mechanical properties of transmission, and the plastic washer 2 adopts a material with good mechanical strength, which reduces the cost while improving the bearing capacity and service life.

[0023] The plastic washer 2 is pressed into the groove 13, and the anti-rotation structure installs the plastic washer 2 in the plastic gear 1. After assembly, the plastic washer 2 has no looseness or shaking. The thickness of the plastic washer 2 is greater than the depth of the groove 13, so that the plastic washer 2 is exposed outside the end face of the plastic gear 1 to form a new shaft shoulder, replacing the original plastic gear 1 to bear the force with the end face and web. The plastic washer 2 bears the load of the plastic gear 1, thus solving the problems of wear on the end face of the plastic gear 1 and damage to the web.

[0024] Furthermore, the anti-rotation structure is that a strip groove 14 communicating with the concave cavity 13 is provided in the plastic gear 1, and a boss 21 matching with the strip groove 14 is provided on the plastic washer 2. The boss 21 is sleeved in the strip groove 14. The strip groove 14 and the boss 21 are closely matched. After assembly, the plastic washer 2 has no radial rotation relative to the plastic gear 1, improving the bonding firmness between the plastic washer 2 and the plastic gear 1, and thus improving the axial bearing capacity of the plastic washer 2. With this structure, the anti-rotation structure plays a role of positioning and alignment when installing the plastic washer 2, and during operation, it can also limit the axial translation of the plastic gear 1, improving the transmission accuracy and stability of the plastic gear 1. Preferably, multiple groups of strip grooves 14 can be provided, which are arranged at intervals along the circumferential direction of the concave cavity 13, and multiple groups of bosses 21 are correspondingly provided. The shape of the strip groove 14 is one of an arc shape, a dovetail shape or a triangle shape, and the boss has a corresponding shape match.

[0025] Furthermore, the strip grooves 14 on the first end face 11 and the strip grooves 14 on the second end face 12 are arranged in a staggered manner.

[0026] The specific embodiments described above further elaborate in detail the purpose, technical solutions and beneficial effects of the present utility model. It should be understood that the above description is only the specific implementation method of the present utility model and is not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the gist of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A combined strength compensation gear structure, characterized in that: include: A plastic gear (1), wherein end surfaces disposed opposite to each other on both sides of the plastic gear (1) are respectively a first end surface (11) and a second end surface (12), and the first end surface (11) and the second end surface (12) are respectively provided with a concave cavity (13); and Two sets of plastic washers (2) are respectively clamped in the concave cavity (13) through the anti-rotation structure, and the plastic washers (2) are exposed on the end surface of the plastic gear (1) to form a shaft shoulder.

2. The combined strength compensation gear structure according to claim 1, characterized in that: The anti-rotation structure comprises a strip groove (14) connected to the concave cavity (13) provided on the plastic gear (1), a boss (21) matched with the strip groove (14) provided on the plastic gasket (2), and the boss (21) is inserted into the strip groove (14).

3. The combined strength compensation gear structure according to claim 2, characterized in that: The shape of the strip groove (14) is one of an arc shape, a dovetail shape or a triangle shape, and the boss (21) is matched with the corresponding shape.

4. The combined strength compensation gear structure according to claim 2 or 3, characterized in that: A plurality of groups of strip grooves (14) are provided, which are arranged at intervals along the circumference of the cavity (13), and a plurality of groups of bosses (21) are provided accordingly.

5. The combined strength compensation gear structure according to claim 2 or 3, characterized in that: The strip grooves on the first end surface (11) and the strip grooves (14) on the second end surface (12) are arranged in a staggered manner.

6. The combined strength compensation gear structure according to claim 1, 2 or 3, characterized in that: The material of the plastic gasket (2) is polyamide resin with added glass fiber, and the material of the plastic gear (1) is polyoxymethylene.

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