Composite worm gear structure

Abstract

The composite worm gear structure comprises a worm gear, the worm gear comprises an embedded body and an outer wrapping body, the outer wrapping body is fixedly arranged on the outer side of the embedded body in a sleeving mode, a limiting groove sunken inwards is formed in the middle of the embedded body, annular limiting protrusions are correspondingly arranged on the inner wall of the outer wrapping body, and knurls are arranged at the joint of the outer side surface of the embedded body and the outer wrapping body in the axial direction. The worm gear has the advantages that relative rotation of the inner embedded body and the outer wrapping body is avoided, the overall structural strength of the worm gear is improved, the service life of the worm gear is prolonged, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of worm gears, and in particular to a composite worm gear structure. Background Art

[0002] Worm gear mechanisms are often used to transmit motion and power between two staggered shafts. Worm gear and worm gear mechanisms are often used in situations where two shafts are staggered, the transmission ratio is large, the transmission power is not large, or the work is intermittent.

[0003] Compared with steel, copper has better wear resistance and longer service life, so copper is generally used to manufacture worm gears. However, due to the relatively high price of copper, the corresponding production cost of worm gears is relatively high. In order to reduce costs, worm gears with composite structures are generally used. For example, the authorized utility model patent with application number: CN 217355459 U and utility model name: Casting worm gear structure discloses a casting worm gear structure, which includes an insert, and a plurality of concave platforms are evenly distributed on the axial side surfaces of the insert along the circumferential direction. The side walls of the concave platforms and the bottom surfaces of the concave platforms are inclined, and the concave platforms realize circumferential limiting, thereby avoiding relative rotation between the insert and the worm gear. However, errors are still easy to occur between the insert and the worm gear in the axial direction, and the structural strength is not high. Utility Model Content

[0004] In order to solve the problems of low strength and short service life of the existing composite worm gear connection structure in the prior art, the present application provides a composite worm gear structure.

[0005] A composite worm gear structure provided in the present application adopts the following technical solution: a composite worm gear structure, comprising a worm gear, wherein the worm gear comprises an inner body and an outer body, wherein the outer body is fixedly sleeved on the outside of the inner body, an inwardly recessed limiting groove is provided in the middle of the inner body, and an annular limiting protrusion is correspondingly provided on the inner wall of the outer body.

[0006] By adopting the above technical solution, the inner body and the outer body are axially limited by the cooperation of the limiting groove and the limiting protrusion, thereby effectively avoiding axial deviation of the inner body and the outer body.

[0007] Optionally, knurling is provided axially at a connection between the outer surface of the inlay and the outer enclosure.

[0008] By adopting the above technical solution, the friction between the inner body and the outer body is increased by arranging the knurling, so as to prevent the inner body and the outer body from rotating relative to each other, thereby improving the overall structural strength of the worm gear.

[0009] Optionally, an axial hole is opened in the middle of the inlay.

[0010] By adopting the above technical solution, an axial hole is provided in the middle of the inlay for connecting the rotating shaft.

[0011] Optionally, a rotating shaft is further included, and the inlay is sleeved on the rotating shaft through an axial hole, and the inlay and the rotating shaft are connected by interference fit.

[0012] Optionally, the outer package is formed on the outside of the inner package by casting or die-casting.

[0013] By adopting the above technical solution, the outer package is cast or die-cast on the outside of the inner package, thereby improving the integrity and overall structural strength of the worm gear.

[0014] Optionally, the embedded body is made of an iron core, and the outer body is made of tin bronze.

[0015] Optionally, worm gear teeth are arranged on the outer surface of the outer enclosure along the circumferential direction.

[0016] Optionally, a keyway is provided on the inner wall of the shaft hole, and a key is provided on the rotating shaft corresponding to the keyway.

[0017] By adopting the above technical solution and setting a key, the structural strength of the connection between the rotating shaft and the shaft hole is improved, and the structural stability of the connection between the rotating shaft and the shaft hole is improved.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] In the present application, knurling and limiting grooves are arranged at the connection between the inner body and the outer body, and a limiting protrusion is arranged on the inner wall of the outer body. The axial limitation of the inner body and the outer body is achieved through the cooperation of the limiting protrusion and the limiting groove. By arranging the knurling, the relative rotation of the inner body and the outer body is avoided, the overall structural strength of the worm gear is improved, the service life of the worm gear is extended, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a composite worm gear structure in Example 1 of the present application.

[0021] Figure 2 This is a schematic diagram of a worm gear explosion of a composite worm gear structure in Example 1 of the present application.

[0022] Figure 3 It is a schematic diagram of the internal structure of a worm gear of a composite worm gear structure in Example 1 of the present application.

[0023] Figure 4 It is a schematic diagram of the overall structure of a composite worm gear structure in Example 2 of the present application.

[0024] Explanation of the accompanying reference numerals: 1. worm gear; 2. rotating shaft; 3. embedded body; 4. outer body; 5. limiting groove; 6. knurling; 7. shaft hole; 8. worm gear tooth; 9. limiting protrusion; 10. keyway; 11. key. DETAILED DESCRIPTION

[0025] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0026] See also Figure 1-4 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of this application, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical content disclosed in this application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this application. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this application without substantially changing the technical content.

[0027] The following is combined with Figure 1-4 This application is described in further detail.

[0028] Embodiment 1:

[0029] Reference Figure 1 , Figure 2 and Figure 3 A composite worm gear structure comprises a worm wheel 1 and a rotating shaft 2. The worm wheel 1 comprises an inlay 3 and an outer package 4. The outer package 4 is sleeved on the outer side of the inlay 3. A limiting groove 5 recessed inwardly is provided in the middle of the outer circumferential surface of the inlay 3. A limiting protrusion 9 matching the limiting groove 5 is provided on the inner wall of the outer package 4. A knurling 6 is further provided at the connection between the outer surface of the inlay 3 and the outer package 4. A worm wheel tooth 8 is processed on the outer surface of the outer package 4. The worm wheel 1 is sleeved on the rotating shaft 2. The worm wheel 1 and the rotating shaft 2 are connected by interference fit.

[0030] In the present embodiment, a manufacturing method of a composite worm gear structure is as follows: the inlay 3 adopts an iron core, a shaft hole 7 for connecting the rotating shaft 2 is processed in the middle of the iron core, an annular limiting groove 5 is processed in the middle of the outer surface of the iron core, and knurling 6 is processed on the upper and lower sides of the limiting groove 5. Then, an outer body 4 is cast with tin bronze on the outer side of the iron core by casting or die-casting. During the casting or die-casting process, copper enters the limiting groove 5 and the groove in the knurling 6, thereby forming an annular limiting protrusion 9 in the middle of the outer body 4, and the outer body 4 is tightly combined with the inlay 3. When the worm wheel 1 and the rotating shaft 2 are transferred, the worm wheel 1 is The worm wheel 1 is heated to expand, and the diameter of the shaft hole 7 increases after the expansion. The worm wheel 1 is sleeved on the rotating shaft 2 and then cooled. The size of the worm wheel 1 is restored after cooling, so that the worm wheel 1 is tightly sleeved on the rotating shaft 2 through the shaft hole 7 to achieve an interference fit connection. During the use of the worm wheel 1, the axial limitation is achieved through the cooperation of the limiting groove 5 and the limiting protrusion 9, thereby avoiding axial misalignment of the worm wheel 1. The knurling 6 improves the connection tightness of the worm wheel 1 and achieves circumferential limitation at the same time, thereby avoiding relative rotation between the inlay 3 and the outer enclosure 4, improving the overall structural strength of the worm wheel 1, and extending the service life of the worm wheel 1.

[0031] Embodiment 2:

[0032] Reference Figure 4 The difference between this embodiment and the first embodiment is that in this embodiment, a keyway 10 is provided inside the shaft hole 7 along the length direction, a key 11 is provided on the rotating shaft 2 corresponding to the keyway 10, the rotating shaft 2 and the embedded body 3 are connected by the key 11, and the circumferential fixation of the rotating shaft 2 and the worm gear 1 is achieved by the cooperation between the key 11 and the keyway 10.

[0033] In summary, in the present application, knurling and limiting grooves are provided at the connection between the inner body and the outer body, and limiting protrusions are provided on the inner wall of the outer body. The axial limiting of the inner body and the outer body is achieved through the cooperation of the limiting protrusions and the limiting grooves. The knurling is provided to avoid the relative rotation of the inner body and the outer body, thereby improving the overall structural strength of the worm gear, extending the service life of the worm gear, and reducing the production cost. Therefore, the present application effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0034] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present application shall still be included in the protection scope of the present application.

Claims

1. A composite worm gear structure, characterized in that: The worm wheel (1) comprises an inner body (3) and an outer body (4), the outer body (4) being fixedly sleeved on the outer side of the inner body (3), an inwardly recessed limiting groove (5) being provided in the middle of the inner body (3), and an annular limiting protrusion (9) being correspondingly provided on the inner wall of the outer body (4).

2. A composite worm gear structure according to claim 1, characterized in that: Knurling (6) is provided along the axial direction at the connection between the outer surface of the inlay body (3) and the outer enclosure (4).

3. A composite worm gear structure according to claim 1, characterized in that: An axial hole (7) is provided in the middle of the inlay (3).

4. A composite worm gear structure according to claim 3, characterized in that: It also comprises a rotating shaft (2), the inlay (3) being sleeved on the rotating shaft (2) through an axial hole (7), and the inlay (3) and the rotating shaft (2) being connected by an interference fit.

5. The composite worm gear structure according to claim 1, characterized in that: The outer package (4) is formed on the outside of the inner package (3) by casting or die-casting.

6. A composite worm gear structure according to claim 5, characterized in that: The embedded body (3) is made of an iron core, and the outer body (4) is made of tin bronze.

7. The composite worm gear structure according to claim 1, characterized in that: The outer surface of the outer enclosure (4) is provided with worm gear teeth (8) along the circumferential direction.

8. The composite worm gear structure according to claim 4, characterized in that: A keyway (10) is provided on the inner wall of the shaft hole (7), and a key (11) is provided on the rotating shaft (2) corresponding to the keyway (10).

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