CN111720516A - Composite plastic gear - Google Patents
Composite plastic gear Download PDFInfo
- Publication number
- CN111720516A CN111720516A CN202010491982.4A CN202010491982A CN111720516A CN 111720516 A CN111720516 A CN 111720516A CN 202010491982 A CN202010491982 A CN 202010491982A CN 111720516 A CN111720516 A CN 111720516A
- Authority
- CN
- China
- Prior art keywords
- tooth
- tooth surface
- plastic gear
- composite plastic
- tooth part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Gears, Cams (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a composite plastic gear, wherein a tooth surface layer is made of a plastic material with a certain thickness, a tooth part and a hub part below the tooth surface are made of other materials, the tooth surface and the tooth part are fixedly connected together, and the tooth part and the hub part are fixedly connected together. Compared with the traditional plastic gear, the gear adopting the structure of the invention has the capabilities of abrasion resistance and high temperature resistance.
Description
Technical Field
The invention relates to a plastic gear, in particular to a composite plastic gear, and belongs to the field of gear engineering.
Background
Because the plastic gear has the advantages of light weight, low cost, low noise and the like, the plastic gear is widely applied to the industrial field in recent decades, and has high requirements on the performance of return difference, efficiency, rigidity, noise and the like of the gear box in the fields of some precise transmission and service robots.
One of the biggest characteristics of plastics is thermoplasticity, and in the case of pure materials, the elastic modulus of the plastic material is obviously reduced along with the increase of temperature, so that the meshing rigidity of the plastic gear is reduced along with the increase of temperature, and the return difference is increased. In the traditional method, a plastic material containing glass fiber or carbon fiber is adopted to replace a pure material, but the addition of the glass fiber or the carbon fiber can cause the gear to be easily worn.
In order to overcome the defects of the prior art, the invention provides a novel composite plastic gear.
Disclosure of Invention
The invention adopts a composite material plastic gear, the tooth surface of the composite material plastic gear is made of a plastic pure material, the tooth part of the composite material plastic gear is made of a plastic pure material and a reinforcing component, the reinforcing component is glass fiber or carbon fiber, the content of the glass fiber or the carbon fiber is generally not more than 30%, and the hub is made of the plastic pure material. The composite plastic gear well solves the problems that the meshing rigidity of a plastic pure material gear is reduced at high temperature, and the transmission return difference of a gear pair is increased, and also solves the problem that the whole gear is abraded by adding glass fiber or carbon fiber plastic material tooth surfaces and inner holes.
A composite plastic gear is composed of a tooth surface, a tooth part and a hub, wherein the tooth surface and other parts of the plastic gear are made of different materials, the tooth surface and the tooth part are fixedly connected together through an injection molding process and can also be fixedly connected together through other modes, and the tooth part and the hub are fixedly connected together through the injection molding process and can also be fixedly connected together through other modes.
Preferably, the tooth surface of the composite plastic gear is made of plastic pure materials, namely, the composite plastic gear does not contain glass fibers, carbon fibers and other reinforcing additives, and other parts are fixedly connected together by adopting materials different from the tooth surface.
Preferably, the tooth part is made of the same material as the base material of the tooth surface material, but the material contains a reinforcing component, and the reinforcing component improves the mechanical properties of the plastic material such as elastic modulus, tensile strength, yield strength and the like at high temperature.
Preferably, the tooth part is made of the same material as the tooth surface material base material, but the material contains glass fiber.
Preferably, the tooth part is made of the same material as the tooth surface material base material but containing carbon fiber.
Preferably, the tooth part is made of metal material, and the hub is made of plastic material.
Preferably, the tooth part is made of metal material, and the hub is made of plastic material the same as the tooth surface.
Preferably, the tooth part is made of a magnesium alloy material.
Preferably, the tooth surface is made of a pure polyformaldehyde material, and the tooth part is made of a polyformaldehyde and glass fiber material.
Preferably, the tooth surface is made of pure nylon materials, and the tooth part is made of nylon and glass fiber materials.
Preferably, the tooth surface, the tooth part and the hub are realized by means of die forming. The tooth part is firstly molded, then the hub is molded, and finally the tooth surface is molded.
Preferably, the tooth surface thickness is not less than 0.1 mm.
Preferably, the tooth surface and the tooth part are realized by means of die forming. The tooth part is injection molded first, and then the tooth surface is injection molded.
The gear has the advantages that the tooth surface is made of wear-resistant plastic pure materials, the tooth part is made of metal materials or reinforced plastic materials, the hub is made of the plastic pure materials, the problems of poor meshing rigidity and large return difference of the plastic gear at high temperature are solved, and low wear of tooth surface meshing and low wear of an inner hole and an inter-shaft sliding pair are realized.
For a better understanding of the nature and technical content of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are included to provide a further understanding of the invention, and to the accompanying drawings, which are incorporated in and constitute a part of this specification.
Drawings
FIG. 1 is a cross-sectional view of a composite plastic gear of the present invention 1.
FIG. 2 is a cross-sectional view of a composite plastic gear of the present invention 2.
FIG. 3 is a cross-sectional view of a composite plastic gear of the present invention.
FIG. 4 shows a first process route of a composite plastic gear of the present invention.
FIG. 5 shows a second process route for manufacturing a composite plastic gear according to the present invention.
FIG. 6 is a graph comparing the performance of plastic virgin material and reinforced component material.
Detailed Description
The technical solution and other advantages of the present invention will become apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
Referring to fig. 1, a composite plastic gear 2 according to an embodiment of the present invention includes a tooth surface 21, a tooth portion 22 and a hub 23, wherein the tooth surface 21 is fixedly connected to the tooth portion 22, and the tooth portion 22 is fixedly connected to the hub 23.
The tooth flanks 21 and the teeth 22 can be injection-molded together by means of an injection molding process or can be connected together in some other way, and the teeth 22 and the hub 23 can be injection-molded together by means of an injection molding process or can be connected together in some other way. The tooth surface 21 is usually made of plastic pure material, the tooth portion 22 is made of metal material or added strength additive component based on the plastic pure material, and the hub 23 is made of the same material as the tooth surface 31. Referring to fig. 4, the injection molding process comprises the steps of firstly injecting the tooth part, then injecting the hub, and finally injecting the tooth surface, wherein the hub and the tooth surface can also be injected in the same process.
Referring to fig. 2, the composite plastic gear 3 according to an embodiment of the present invention includes a tooth surface 31, a tooth portion 32, the tooth portion and the hub form a partial tooth portion 32, and the tooth surface 31 and the tooth portion 32 are fixedly connected. The tooth flanks 31 and the teeth 32 can be injection-molded together by means of an injection molding process, or can be connected together in other ways. The tooth surface 31 is usually made of plastic pure material, the tooth part is made of metal material or added with strength additive components on the basis of the plastic pure material, and the thickness of the tooth surface is recommended to be 0.1mm at the minimum.
Referring to fig. 3, the composite plastic gear 4 according to an embodiment of the present invention includes a tooth surface 41, a tooth portion 42 and a hub 43, wherein the tooth surface 41 is fixedly connected to the tooth portion 42, and the tooth portion 42 is fixedly connected to the hub 43.
The tooth faces 41 and the teeth 42 may be injection molded together by an injection molding process or may be otherwise connected together, and the teeth 42 and the hub 43 may be injection molded together by an injection molding process or may be otherwise connected together. The teeth are convex, the tooth surface 41 is usually made of plastic pure material, and the teeth 42 are made of metal material. Referring to fig. 5, in the gear process route, a tooth part is molded by a grinding tool or machined, then a hub is injection molded, and finally a tooth surface, a tooth surface and the hub can be simultaneously injection molded.
Referring to fig. 3, the tooth part is made of a metal material, and when the gear is engaged, heat generated by the engagement of the tooth surface can be released through the tooth part, so that the engagement rigidity, the backlash and the service life of the gear can be improved.
Please refer to fig. 4, which shows stress-strain curves of the polyoxymethylene pure material and the polyoxymethylene 25% glass fiber material at 60 degrees, 90 degrees and 120 degrees, 51, 53 and 55 are stress-strain curves of the polyoxymethylene 25% glass fiber material, 52, 54 and 56 are stress-strain curves of the polyoxymethylene pure material, it can be seen that the elastic modulus of the 25% glass fiber material at a temperature above 60 degrees is much larger than that of the polyoxymethylene pure material, the tooth surface is the polyoxymethylene pure material, the tooth portion is the gear pair meshing rigidity of the polyoxymethylene 25% glass fiber gear and the breaking strength of the gear are much larger than that of the polyoxymethylene pure material gear, and the return difference is smaller than that of the polyoxymethylene pure material gear.
The above description is only exemplary of the present invention and should not be taken as limiting, any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A composite plastic gear is characterized in that: the plastic gear consists of a tooth surface, a tooth part and a hub, wherein the tooth surface and other parts of the plastic gear are made of different materials, the tooth surface and the tooth part are fixedly connected together through an injection molding process, and the tooth part and the hub are fixedly connected together through an injection molding process.
2. A composite plastic gear according to claim 1, characterized in that: the composite plastic gear tooth surface is made of plastic pure materials, namely glass fibers, carbon fibers and other reinforcing additives are not contained, and other parts are fixedly connected together by adopting materials different from the tooth surface.
3. A composite plastic gear according to claim 1, characterized in that: the tooth part is made of a material which is the same as a tooth surface material base material and contains a reinforcing component, and the reinforcing component improves the elastic modulus, tensile strength and yield strength mechanical properties of the plastic material at high temperature.
4. A composite plastic gear according to claim 1, characterized in that: the tooth part is made of a material which is the same as the tooth surface material base material but contains glass fiber.
5. A composite plastic gear according to claim 1, characterized in that: the tooth part is made of the same material as the tooth surface material base material but containing carbon fiber.
6. A composite plastic gear according to claim 1, characterized in that: the tooth part is made of metal materials, and the hub is made of plastic materials.
7. A composite plastic gear according to claim 1, characterized in that: the tooth part is made of metal materials, and the hub is made of plastic materials the same as tooth surfaces of the hub.
8. A composite plastic gear according to claim 1, characterized in that: the tooth part is made of magnesium alloy material.
9. A composite plastic gear according to claim 1, characterized in that: the tooth surface is made of a pure polyformaldehyde material, and the tooth part is made of a polyformaldehyde and glass fiber material; or the tooth surface is made of pure nylon materials, and the tooth part is made of nylon and glass fiber materials.
10. A composite plastic gear according to claim 1, characterized in that: the tooth surface and the tooth part are realized in a mode of mold forming; the tooth part is injection molded first, and then the tooth surface is injection molded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010491982.4A CN111720516A (en) | 2020-06-03 | 2020-06-03 | Composite plastic gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010491982.4A CN111720516A (en) | 2020-06-03 | 2020-06-03 | Composite plastic gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111720516A true CN111720516A (en) | 2020-09-29 |
Family
ID=72565597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010491982.4A Pending CN111720516A (en) | 2020-06-03 | 2020-06-03 | Composite plastic gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111720516A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432053A (en) * | 2021-12-29 | 2022-05-06 | 浙江夏厦精密制造股份有限公司 | Disabled person's seat with accurate reduction gear of low noise |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205967A (en) * | 2006-12-19 | 2008-06-25 | 铃木株式会社 | Plastic gear |
| CN201288806Y (en) * | 2008-11-06 | 2009-08-12 | 张宏艳 | Compound gear |
| DE102016209120A1 (en) * | 2016-05-25 | 2017-11-30 | Robert Bosch Gmbh | Gear and method for producing a gear |
| CN209100591U (en) * | 2018-11-12 | 2019-07-12 | 佛山市顺德区凯恒电机有限公司 | A kind of plastic cement gear and gear reduction |
| CN110030364A (en) * | 2019-04-19 | 2019-07-19 | 浙江美亚特精密机械有限公司 | A kind of multiple field metal/resin gear and its manufacturing process and purposes |
-
2020
- 2020-06-03 CN CN202010491982.4A patent/CN111720516A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205967A (en) * | 2006-12-19 | 2008-06-25 | 铃木株式会社 | Plastic gear |
| CN201288806Y (en) * | 2008-11-06 | 2009-08-12 | 张宏艳 | Compound gear |
| DE102016209120A1 (en) * | 2016-05-25 | 2017-11-30 | Robert Bosch Gmbh | Gear and method for producing a gear |
| CN209100591U (en) * | 2018-11-12 | 2019-07-12 | 佛山市顺德区凯恒电机有限公司 | A kind of plastic cement gear and gear reduction |
| CN110030364A (en) * | 2019-04-19 | 2019-07-19 | 浙江美亚特精密机械有限公司 | A kind of multiple field metal/resin gear and its manufacturing process and purposes |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432053A (en) * | 2021-12-29 | 2022-05-06 | 浙江夏厦精密制造股份有限公司 | Disabled person's seat with accurate reduction gear of low noise |
| CN114432053B (en) * | 2021-12-29 | 2024-04-26 | 浙江夏厦精密制造股份有限公司 | Disabled person seat with low-noise precise speed reducer |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200929 |
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| RJ01 | Rejection of invention patent application after publication |