Worm gear with hard insert on tooth surface and manufacturing method

Abstract

The invention discloses a worm gear with hard inserts on tooth surfaces and a manufacturing method, the worm gear comprises a worm gear base body and a tooth surface hard insert connecting layer, the worm gear base body is provided with a gear tooth part, pressure borne by the tooth surface hard inserts is transmitted to the surfaces of the gear teeth, the hard inserts are used as the tooth surfaces, so that the friction coefficient between the worm gear and a worm can be greatly reduced, and the service life of the worm gear is prolonged. The transmission efficiency is improved, heat is reduced, the tooth surface hard insert is positioned through a female die bonding method, glue injection forming is carried out, machining is easy and convenient, and cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of worm gear transmission, and in particular to a worm gear with a hard insert on its tooth surface and a manufacturing method thereof. Background Art

[0002] Worm gear transmission is a common mechanical transmission method. Its advantages are large transmission ratio and stable transmission. Its disadvantages are high sliding friction between the worm gear and the low transmission efficiency, which causes heat and wear. Traditional worm gears are made of materials with low hardness and good toughness. The reason is that worm gears are difficult to process and are difficult to grind. Worm gears made of materials with low hardness are easier to run in with worms with higher hardness, forming a larger contact surface. However, this results in a large friction coefficient between the worm gear and the worm, resulting in low transmission efficiency and serious heat generation. In order to reduce the sliding friction between the worm gear, patent 200920282974.8 (CN202082364U) proposes a method of surface coating with ceramic film, which has the advantages of reducing the friction coefficient, improving transmission efficiency, reducing heat and improving the heat resistance of the worm gear. However, this method has several defects. First, the substrate must be an aluminum-based material to obtain an aluminum oxide film layer. Second, the film layer thickness is only 0.02 mm. When there are fine impurities between the worm gear, because the hardness of the substrate is not high and the film layer is thin, it is very easy to break and peel off the film layer. The peeled film layer aggravates the peeling of the intact film layer, causing the worm gear film layer to fail quickly and causing a large amount of impurities to exist in the box. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a worm wheel with a hard insert on the tooth surface, which can effectively solve the shortcomings of the prior art.

[0004] The present invention is realized by the following technical scheme: a worm wheel with hard inserts on the tooth surface comprises a worm wheel matrix, hard inserts on the tooth surface and an adhesive layer.

[0005] As a preferred technical solution, the tooth surface hard insert on a single tooth surface is one or more pieces.

[0006] As a preferred technical solution, the hard insert is made of cemented carbide, structural ceramics or hardened steel.

[0007] As a preferred technical solution, when there is only one tooth surface hard insert on a single tooth surface, the surface of the hard insert is consistent with the tooth profile surface of the standard worm gear sample.

[0008] As a preferred technical solution, when there are multiple hard inserts, the surface of the hard insert is a plane or a convex surface.

[0009] As a preferred technical solution, when there are multiple inserts, there are gaps between the inserts and the adhesive layer is fiber reinforced.

[0010] As a preferred technical solution, the reinforcing fibers are carbon fibers, aramid fibers, and glass fibers.

[0011] As a preferred technical solution, the worm wheel base has a gear tooth portion, and the pressure exerted on the hard insert on the tooth surface is transmitted to the gear tooth surface.

[0012] The manufacturing method of the worm wheel with hard inserts on the tooth surface of the present invention comprises the following steps:

[0013] S1: Make standard worm gear samples;

[0014] S2: Make a ring mold, with several ring blocks positioned and pressed on a mold base to form a ring; the mold, and place the worm gear standard sample in the middle;

[0015] S3: injection molding to form the negative mold of the worm gear standard sample;

[0016] S4: Cut the female mold into several pieces according to the annular block, and the cutting line is the central radial line and does not pass through the worm gear tooth surface;

[0017] S5: Take out the worm gear standard sample and stick a hard insert on the tooth surface of each female module;

[0018] S6: The female modules are assembled and positioned and pressed onto the mold base to form a worm gear female mold and put into the worm gear matrix;

[0019] S7: glue injection;

[0020] S8: Remove the female molds, and the worm wheel base, the rubber layer, and the hard inserts are formed, and the worm wheel with hard inserts on the tooth surface is completed.

[0021] The manufacturing method of the worm wheel with hard inserts on the tooth surface of the present invention comprises the following steps:

[0022] S1: Make standard worm gear samples;

[0023] S2: Making an annular mold, wherein a plurality of annular blocks can be positioned and pressed on a mold base plate to enclose an annular mold and a worm gear standard sample is placed in the middle position, and a rubber spacer is provided between each annular block, and the rubber spacer is aligned with the middle of the tooth top or the middle of the tooth bottom, and abuts against the tooth top or tooth bottom surface of the worm gear standard sample;

[0024] S3: injection molding to form the negative mold of the worm gear standard sample;

[0025] S4: Take out the worm gear standard sample and stick a hard insert on the tooth surface of each female module;

[0026] S5: The female modules are assembled and positioned and pressed onto the mold base plate to form a worm gear female mold and the worm gear base is placed therein;

[0027] S6: glue injection;

[0028] S7: Remove the female modules, and the worm wheel base, the rubber layer, and the hard inserts are formed, and the tooth surface of the worm wheel with hard inserts is completed.

[0029] The beneficial effects of the present invention are as follows: using hard inserts as tooth surfaces can greatly reduce the friction coefficient between worm gears, increase transmission efficiency and reduce heat generation; positioning the hard inserts on the tooth surfaces by a female mold bonding method and injecting glue to form the hard inserts makes processing simple and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of a worm gear with multiple inserts having a hard insert on the tooth surface of the present invention;

[0032] Figure 2 It is a schematic diagram of a single-block insert gear tooth of a worm wheel having a hard insert on the tooth surface of the present invention;

[0033] Figure 3 It is the standard sample of the worm gear of the present invention;

[0034] Figure 4 It is a schematic diagram of the annular mold of the present invention;

[0035] Figure 5 is a cross-sectional view of the annular mold of the present invention;

[0036] Figure 6 This is a schematic diagram of the female mold after glue injection of the present invention;

[0037] Figure 7 This is a schematic diagram of cutting after the female mold is injected with glue according to the present invention;

[0038] Figure 8 It is a schematic diagram of the separation of the female mold after cutting of the present invention;

[0039] Fig. 9 It is a schematic diagram of the mold closing after the hard insert is glued to the surface of the female mold tooth of the present invention;

[0040] Fig.10 It is a schematic diagram of the worm gear base of the present invention;

[0041] Fig.11 It is a schematic diagram of the worm wheel matrix and the hard insert adhesive layer after forming of the present invention;

[0042] Fig.12This is a schematic diagram of the annular mold with a rubber partition plate of the present invention;

[0043] Fig.13 It is a cross-sectional view of the annular mold with a rubber partition plate of the present invention; Description of the drawings:

[0045] 1. Worm wheel base gear teeth; 2. Hard paper inserts; 201. Single wheel gear multiple inserts; 202. Single wheel gear single insert; 3. Adhesive layer; 4. Worm wheel standard sample; 5. Mold base plate; 6. Ring block; 7. Pressing screw; 8. Positioning pin; 9. Rubber separator; 10. Center positioning pin; 11. Worm wheel base; 12. Female mold injection layer; 13. Female mold cutting line; 14. Worm wheel with hard inserts on the tooth surface; DETAILED DESCRIPTION

[0046] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0047] Any feature disclosed in this specification (including any additional claims, abstract and drawings), unless otherwise stated, may be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0048] Example 1

[0049] like Figure 1 , Figures 3 to 11 As shown, Fig.10 The toothed surface of the worm gear base shown in the figure has an adhesive layer 3, and a plurality of hard inserts 201 are fixed on the toothed surface ( Fig.11 ), make a standard sample of the worm gear to be buried in the ground, and make Figure 4 , Figure 5 The mold shown in the figure has a plurality of annular blocks 6 on a mold base plate 5. Each annular block 6 is positioned and fixed on the mold base plate 5 by a clamping screw 7 and a positioning pin 8. A central positioning pin is provided in the middle to position the inner hole of the worm gear standard sample. The glue is injected to form a negative mold injection layer 12 ( Figure 6 As shown), the cutting line is set according to the edge of the annular block, and the cutting line does not pass through the contact part between the tooth shape and the worm gear ( Figure 7 After the cutting is completed, each annular block 6 and the corresponding female mold injection layer 12 form a female module ( Figure 8 As shown), a hard insert 2 is glued to the toothed surface of each female mold with a self-adhesive adhesive. The surface of the hard insert can be a flat surface or a convex surface. Then the mold is closed and installed on the mold base plate 5 ( Fig. 9 As shown), insert the worm gear base ( Fig.10 As shown) and inject glue, after the glue is dry, remove each female module to obtain the finished worm gear. The tooth surface of the worm gear 14 ( Fig.11 shown).

[0050] Example 2

[0051] The difference from Example 1 is that there are several rubber partition plates 9 ( Fig.12 Fig.13 As shown in the figure, the female mold cutting process can be omitted after the female mold is injected with glue, and the other processes are consistent with those in Example 1.

[0052] Example 3

[0053] The difference from the embodiments 1 and 2 is that the hard insert is a piece on one tooth surface. Figure 2 The single gear tooth single block insert 202 has a surface that is consistent with the corresponding surface of the worm gear standard sample.

[0054] The beneficial effects of the present invention are as follows: using hard inserts as tooth surfaces can greatly reduce the friction coefficient between worm gears, increase transmission efficiency and reduce heat generation; positioning the hard inserts on the tooth surfaces by a female mold bonding method and injecting glue to form the hard inserts makes processing simple and reduces costs.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A worm wheel having a hard insert on the tooth surface, characterized in that: The invention comprises a worm wheel matrix, a tooth surface hard insert and a bonding layer.

2. The worm wheel with hard inserts on the tooth surface according to claim 1 is characterized in that: The tooth surface hard insert on a single tooth surface is one or more pieces.

3. The method according to claim 1 or 2, characterized in that: The hard insert is made of cemented carbide, structural ceramic or hardened steel.

4. The method according to claim 1 or 2, characterized in that: When there is only one tooth surface hard insert on a single tooth surface, the surface of the hard insert is consistent with the tooth profile surface of the standard worm gear sample.

5. The method according to claim 1 or 2, characterized in that: When there are multiple hard inserts, the surfaces of the hard inserts are plane or convex curved surfaces.

6. The method according to claim 1 or 2, characterized in that: When there are multiple hard inserts, there are gaps between the inserts and the adhesive layer is reinforced with fibers.

7. The method according to claim 6, characterized in that: The reinforcing fibers are carbon fiber, aramid fiber and glass fiber.

8. The worm wheel with hard inserts on the tooth surface according to claim 1 is characterized in that: The worm gear base has a gear tooth portion, and the pressure exerted on the hard insert on the tooth surface is transmitted to the gear tooth surface.

9. A method for manufacturing a worm wheel having a hard insert on the tooth surface as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: S1: Make standard worm gear samples; S2: making a ring-shaped mold, wherein a plurality of ring-shaped blocks are positioned and pressed on a mold base plate to form a ring; The mold is then placed, and the worm gear standard sample is placed in the middle; S3: injection molding to form the negative mold of the worm gear standard sample; S4: Cut the female mold into several pieces according to the annular block, and the cutting line is the central radial line and does not pass through the worm gear tooth surface; S5: Take out the worm gear standard sample and stick a hard insert on the tooth surface of each female module; S6: The female modules are assembled and positioned and pressed onto the mold base to form a worm gear female mold and put into the worm gear matrix; S7: glue injection; S8: Remove the female molds, and the worm wheel base, the rubber layer, and the hard inserts are formed, and the worm wheel with hard inserts on the tooth surface is completed.

10. A method for manufacturing a worm wheel having a hard insert on the tooth surface as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: S1: Make standard worm gear samples; S2: Making an annular mold, wherein a plurality of annular blocks can be positioned and pressed on a mold base plate to enclose an annular mold and a worm gear standard sample is placed in the middle position, and a rubber spacer is provided between each annular block, and the rubber spacer is aligned with the middle of the tooth top or the middle of the tooth bottom, and abuts against the tooth top or tooth bottom surface of the worm gear standard sample; S3: injection molding to form the negative mold of the worm gear standard sample; S4: Take out the worm gear standard sample and stick a hard insert on the tooth surface of each female module; S5: The female modules are assembled and positioned and pressed onto the mold base plate to form a worm gear female mold and the worm gear base is placed therein; S6: glue injection; S7: Remove the female modules, and the worm wheel base, the rubber layer, and the hard inserts are formed, and the tooth surface of the worm wheel with hard inserts is completed.

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