CN110486446B - Planetary gear, manufacturing method thereof, clutch component and washing machine - Google Patents

Planetary gear, manufacturing method thereof, clutch component and washing machine Download PDF

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Publication number
CN110486446B
CN110486446B CN201810458355.3A CN201810458355A CN110486446B CN 110486446 B CN110486446 B CN 110486446B CN 201810458355 A CN201810458355 A CN 201810458355A CN 110486446 B CN110486446 B CN 110486446B
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China
Prior art keywords
planetary gear
gear body
reinforcing rib
gear
injection molding
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CN201810458355.3A
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CN110486446A (en
Inventor
卢寅哲
杜斌
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Wuxi Little Swan Electric Co Ltd
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Wuxi Little Swan Electric Co Ltd
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Publication of CN110486446A publication Critical patent/CN110486446A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B29C2071/022—Annealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2015/00—Gear wheels or similar articles with grooves or projections, e.g. control knobs
    • B29L2015/003—Gears
    • 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
    • F16H2055/065—Moulded gears, e.g. inserts therefor

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Gears, Cams (AREA)
  • Retarders (AREA)

Abstract

The invention provides a planetary gear, a manufacturing method thereof, a clutch component and a washing machine, wherein the planetary gear comprises: the gear body is formed by plastic and is annular, a mounting hole is formed in the center of the gear body, an external gear is arranged on the outer edge of the gear body, a first inner flange and a second inner flange are respectively arranged at the front side and the back side of the gear body, which are close to one end of the mounting hole, and a first outer flange and a second outer flange are respectively arranged at the front side and the back side of the gear body, which are far away from one end of the mounting hole; a plurality of first strengthening ribs are arranged on the front face of the gear body, and each first strengthening rib connects the first inner flange with the first outer flange. According to the planetary gear provided by the invention, the two ends of the first reinforcing ribs are respectively connected with the first inner flange on the front side and the first outer flange on the front side, so that the integral rupture strength of the planetary gear can be increased, the service life of the planetary gear is prolonged, and the service life of a clutch component containing the planetary gear and a washing machine is longer.

Description

Planetary gear, manufacturing method thereof, clutch component and washing machine
Technical Field
The invention relates to the technical field of planetary gears, in particular to a planetary gear, a manufacturing method thereof, a clutch component and a washing machine.
Background
At present, after the full-automatic washing machine is put on the market, the planetary gear (injection molding part) of a clutch part is easy to break, so that the full-automatic washing machine cannot continue washing, the service life of the washing machine is shortened, and the maintenance cost is increased. Specifically, the fracture phenomenon of the plastic planetary gear formed by injection molding can be referred to fig. 1.
Therefore, the structural design and manufacturing means of the planetary gear at the present stage need to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
The present invention has been completed based on the following findings of the inventors:
the inventor finds in the course of research that the structure of the existing planetary gear can refer to fig. 2 and 3, and only the first reinforcing ribs 150 connected to the first inner flange 131 are provided on the front face of the planetary gear; also, referring to fig. 1, the plastic planetary gear formed by injection molding is liable to have air holes inside, thereby causing a reduction in the breaking strength and a reduction in the service life of the planetary gear.
Therefore, through intensive research, the inventor of the present invention provides a planetary gear, in which a first inner flange on a front surface is connected to a first outer flange through a first reinforcing rib, so that the overall strength and the service life of the planetary gear can be improved. And, set up a plurality of second strengthening ribs at planetary gear's back, link to each other second inner flange and second outer flange, further improve planetary gear's bulk strength and life. In addition, the injection molding process of the planetary gear can also increase annealing treatment, stress release after demolding and other treatment, or limit the water content of the plastic raw material used in the injection molding process, so that the service life of the planetary gear can be prolonged.
In view of the above, an object of the present invention is to provide a plastic planetary gear having improved fracture strength, an extended service life, or less blowholes.
In a first aspect of the invention, a planetary gear is presented.
According to an embodiment of the invention, the planetary gear comprises: the gear body is formed by plastic and is annular, a mounting hole is formed in the center of the gear body, a plurality of external gears are arranged on the outer edge of the gear body, a first inner flange and a second inner flange are respectively arranged at the ends, close to the mounting hole, of the front face and the back face of the gear body, and a first outer flange and a second outer flange are respectively arranged at the ends, far away from the mounting hole, of the front face and the back face of the gear body; the first reinforcing ribs are arranged on the front face of the gear body, and each first reinforcing rib connects the first inner flange with the first outer flange.
The inventor researches and discovers that according to the planetary gear provided by the embodiment of the invention, the two ends of the first reinforcing ribs are respectively connected with the first inner flange on the front surface and the first outer flange on the front surface, so that the overall anti-fracture strength of the planetary gear can be increased, the service life of the planetary gear is prolonged, and the service life of a clutch component containing the planetary gear and a washing machine is prolonged.
In addition, the planetary gear according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, the planetary gear further comprises: the second inner flange and the second outer flange are connected through the second reinforcing ribs.
According to the embodiment of the invention, the number of the first reinforcing ribs is 3-6.
According to the embodiment of the invention, the number of the second reinforcing ribs is 3-6.
According to an embodiment of the present invention, an orthographic projection of the plurality of first reinforcing ribs on the gear body does not coincide with an orthographic projection of the plurality of second reinforcing ribs on the gear body.
In a second aspect of the invention, a method of manufacturing a planetary gear is presented.
According to an embodiment of the invention, the method comprises: carrying out an injection molding process on the plastic raw material so as to obtain a molded injection molding piece; annealing the molded injection-molded part to obtain the planetary gear.
The inventor finds that by adopting the manufacturing method of the embodiment of the invention, the injection molding part is further annealed, so that the relaxation of high molecules in the plastic part can be accelerated, and the residual internal stress after plastic molding is eliminated or reduced, thereby ensuring the shape and the strength of the planetary gear and further prolonging the service life of the planetary gear.
In addition, the manufacturing method according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the invention, the annealing process comprises: and soaking the molded injection molding piece in hot water at 75-85 ℃ for 1.5-2.5 hours.
According to an embodiment of the invention, after the injection molding process, the method further comprises: and standing the molded injection molding piece after demolding for not less than 10 hours so as to release the residual stress of the molded injection molding piece in the injection molding process.
According to the embodiment of the invention, the plastic raw material is polyformaldehyde, and the water content of the plastic raw material is 0.12-0.25 w/w%.
In a third aspect of the invention, a clutch component is presented.
According to an embodiment of the invention, the clutch member comprises a planetary gear as described above.
The inventor researches and discovers that the clutch component of the embodiment of the invention has higher overall strength and longer service life of the planetary gear, so that the service life of the clutch component can be longer. Those skilled in the art will appreciate that the features and advantages described above with respect to the planetary gear remain applicable to the clutch member and will not be described in detail herein.
In a fourth aspect of the present invention, a washing machine is presented.
According to an embodiment of the present invention, the washing machine includes the above-described clutch member.
The inventor of the invention has found that the washing machine of the embodiment of the invention has longer service life of the clutch component, thereby increasing the service life and long-term use stability of the washing machine. Those skilled in the art will appreciate that the features and advantages described above with respect to the planetary gear and clutch assembly are applicable to the washing machine and will not be described in detail herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a photograph of a planetary gear fracture condition of the prior art;
FIG. 2 is a schematic front and back construction of a prior art planetary gear;
FIG. 3 is a cross-sectional schematic view of the planetary gear of FIG. 2 taken along AA;
FIG. 4 is a schematic front and back view of a planetary gear according to one embodiment of the present invention;
FIG. 5 is a schematic front and back view of a planetary gear according to another embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of the planetary gear of FIG. 5 along BB;
FIG. 7 is a cross-sectional structural schematic view of the planetary gear of FIG. 5 taken along CC;
FIG. 8 is a schematic view of a projected position relationship of a first rib and a second rib according to an embodiment of the present invention;
FIG. 9 is a flow chart of a method of making a planetary gear according to one embodiment of the present invention;
FIG. 10 is a flow chart of a method of making a planetary gear according to another embodiment of the present invention.
Reference numerals
100 gear body
110 mounting hole
120 outer gear
131 first inner flange
132 second inner flange
141 first outer flange
142 second outer flange
150 first reinforcing rib
160 second reinforcing rib
Detailed Description
The following examples of the present invention are described in detail, and it will be understood by those skilled in the art that the following examples are intended to illustrate the present invention, but should not be construed as limiting the present invention. Unless otherwise indicated, specific techniques or conditions are not explicitly described in the following examples, and those skilled in the art may follow techniques or conditions commonly employed in the art or in accordance with the product specifications.
In one aspect of the present invention, a planetary gear is presented. Referring to fig. 4 to 8, the planetary gear of the present invention will be described in detail.
According to an embodiment of the present invention, referring to fig. 4, the planetary gear may include a gear body 100 and a plurality of first reinforcing ribs 150; the gear body 100 is formed by plastic and is annular, a mounting hole 110 is formed in the center of the gear body 100, a plurality of external gears 120 are arranged on the outer edge of the gear body 100, a first inner flange 131 and a second inner flange 132 are respectively arranged at one ends, close to the mounting hole 110, of the front surface and the back surface of the gear body 100, and a first outer flange 141 and a second outer flange 142 are respectively arranged at one ends, far away from the mounting hole 110, of the front surface and the back surface of the gear body 100; and a plurality of first reinforcing ribs 150 are provided on the front surface of the gear body 100, and each first reinforcing rib 150 connects the first inner flange 131 with the first outer flange 141.
In the process of research, the inventor finds that because the viscosity of a plastic material after being melted is much higher than that of a metal molten liquid, air holes are easy to exist inside the planetary gear formed by injection molding, so that the breaking strength of the planetary gear is reduced, and the service life of the planetary gear is shortened. Therefore, the inventors of the present invention have made extensive studies to provide a planetary gear in which the first reinforcing ribs 150 connect the front inner flange 131 to the first outer flange 141, thereby improving the overall strength and lifespan of the planetary gear.
According to an embodiment of the present invention, referring to fig. 5, the planetary gear may further include a plurality of second reinforcing ribs 160, the plurality of second reinforcing ribs 160 being provided on the rear surface of the gear body 100, and each second reinforcing rib 160 connecting the second inner flange 131 with the second outer flange 142. In addition, a plurality of second reinforcing ribs 160 are additionally arranged on the back surface of the planetary gear, and the second inner flange 132 is connected with the second outer flange 142, so that the overall strength and the service life of the planetary gear can be further improved.
According to the embodiment of the present invention, the specific kind of the plastic forming the planetary gear is not particularly limited, and those skilled in the art can select it accordingly according to the actual use environment and the strength required for use of the planetary gear. In some embodiments of the present invention, the plastic forming the gear body 100 may be Polyoxymethylene (POM), so that the planetary gear formed by using the above-mentioned plastic has high strength, good rigidity, good elasticity, good wear resistance and close to metal.
According to an embodiment of the present invention, the specific number of the plurality of first ribs 150 is not particularly limited, and those skilled in the art can design accordingly according to the specific material type of the planetary gear and the specific height of the front flange. In some embodiments of the present invention, the number of the first reinforcing ribs 150 may be 3 to 6, and thus, the strength of the whole planetary gear can be significantly improved by the uniformly distributed 3 to 6 first reinforcing ribs 150. In some specific examples, referring to fig. 5, the number of the first reinforcing ribs 150 may be 3, so that the rigidity requirement of the planetary gear can be met while the raw material is saved. According to the embodiment of the present invention, the specific width of each first rib 150 is not particularly limited, and those skilled in the art can adjust the specific width of the ring of the gear body 100 and the specific height of the front flange accordingly, which will not be described herein again.
According to the embodiment of the present invention, the specific number of the plurality of second reinforcing ribs 160 is not particularly limited, and those skilled in the art can design accordingly according to the specific material kind of the planetary gear and the specific height of the back flange. In some embodiments of the present invention, the number of the second reinforcing ribs may be 3 to 6, and thus, the strength of the whole planetary gear can be further significantly improved by the uniformly distributed 3 to 6 second reinforcing ribs 160. In some specific examples, referring to fig. 5, the number of the second ribs 160 may be 6, so that the rigidity requirement of the clutch shaft transmission on the use of the planetary gear can be met. According to the embodiment of the present invention, the specific width of each second rib 160 is not particularly limited, and those skilled in the art can adjust the specific width of the ring of the gear body 100 and the specific height of the back flange accordingly, which will not be described herein again.
According to the embodiment of the present invention, the specific number of the plurality of outer gears 120 is not particularly limited, and those skilled in the art can design accordingly according to the specific use of the planetary gear. In some embodiments of the present invention, the number of outer gears 120 may be 25, thus, enabling the planetary gear ratio requirements and gear tooth strength requirements.
According to an embodiment of the present invention, referring to fig. 8, the orthographic projection of the plurality of first ribs 150 on the gear body 100 may not coincide with the orthographic projection of the plurality of second ribs 160 on the gear body 100, so that the strength of different angular positions on the gear body 100 can be enhanced by the front first ribs 150 and the rear second ribs 160, respectively, thereby the reinforcing effect of the ribs on the planetary gear is uniform. In some embodiments of the present invention, referring to fig. 6 and 7, 9 points of different angles are reinforced by the first reinforcing rib 150 or the second reinforcing rib 160, so that the reinforcing effect of the planetary gear is more uniform.
In summary, according to the embodiments of the present invention, the present invention provides a planetary gear, wherein two ends of a plurality of first reinforcing ribs are respectively connected to a front first inner flange and a front first outer flange, so that the overall fracture strength of the planetary gear can be increased, the service life of the planetary gear can be prolonged, and the service life of a clutch component containing the planetary gear and a washing machine can be prolonged.
In another aspect of the invention, a method of manufacturing a planetary gear is provided. The manufacturing method of the present invention will be described in detail with reference to fig. 9 to 10. Referring to fig. 9, according to an embodiment of the present invention, the manufacturing method includes:
s100: the plastic raw material is subjected to an injection molding process in order to obtain a molded injection molded part.
In this step, the plastic raw material is subjected to an injection molding process to obtain a molded injection molded part, and thus, an injection molded part having a complicated shape and structure can be obtained. According to the embodiment of the invention, the plastic raw material can be polyformaldehyde, and the water content of the plastic raw material is 0.12-0.25 w/w%.
The inventor of the invention finds that the macromolecular chains in the plastics such as polyformaldehyde contain hydrophilic groups, so that the plastics have obvious moisture absorption tendency; in addition, the plastic may contain hydrophilic groups as reinforcing agents, fillers and other auxiliaries, which also increase the moisture absorption of the material. Furthermore, the rate of moisture absorption from the air of the plastic is related to the specific surface area of the material, and when the plastic raw material is supplied, that is, when the plastic particles have a large specific surface area, the rate of moisture absorption from the air of the plastic is high, and moisture balance is easily achieved, and the moisture of the plastic containing much moisture is changed into gas or hydrolyzed at high temperature and high pressure, so that the problems of foaming, reduced fluidity, silver streaks on the surface, poor electrical properties, even unqualified size and the like of the plastic are caused. Therefore, the water content of the polyformaldehyde material is limited to be in a low range of 0.12-0.25 w/w%, so that fewer air holes in injection-molded parts formed by injection molding can be formed, the yield is higher, and the service life is longer.
In some embodiments of the present invention, referring to fig. 10, after the injection molding process, the manufacturing method may further include:
s300: and standing the molded injection molding after demolding for not less than 10 hours.
Because internal stress is remained in the polymer chains or among the polymer chains in the injection molding process, the injection molded part after demolding is kept stand for more than 10 hours, and the residual stress of the molded injection molded part in the injection molding process can be fully released. In addition, a manufacturer can check the size and the appearance of the injection molding part after standing for 10 hours to prevent the plastic part from warping, deforming and cracking caused by residual stress, so that the yield of the planetary gear can be effectively improved.
S200: the molded injection-molded part is annealed to obtain the planetary gear.
In the step, the molded injection molding piece can be annealed, so that residual stress after plastic molding can be further eliminated or reduced, and the planetary gear with fewer air holes, higher strength and longer service life can be obtained.
According to the embodiment of the present invention, specific process parameters of the annealing treatment, such as temperature, time, etc., are not particularly limited, and those skilled in the art can adjust the process parameters according to the specific kind of plastic and the specific parameters of the injection molding process. In some embodiments of the invention, the molded injection molding piece can be soaked in hot water of 75-85 ℃ for 1.5-2.5 hours through annealing treatment, so that residual internal stress of the planetary gear formed by Polyformaldehyde (POM) is smaller and the service life of the planetary gear is longer by adopting the annealing treatment conditions.
In summary, according to the embodiments of the present invention, the present invention provides a method for manufacturing a planetary gear, in which an injection molded part is further annealed to accelerate the relaxation of polymers in the plastic part, so as to eliminate or reduce residual internal stress after plastic molding, thereby ensuring the shape and strength of the planetary gear and further prolonging the service life of the planetary gear.
In another aspect of the invention, a clutch component is provided. According to an embodiment of the invention, the clutch member comprises the planetary gear as described above.
It should be noted that the clutch component includes other necessary parts or components besides the planetary gear, and those skilled in the art can design and supplement the clutch component accordingly according to the specific type and actual use condition of the clutch component, and will not be described herein again.
In summary, according to the embodiments of the present invention, the present invention provides a clutch member, which has a higher overall strength of the planetary gear and a longer service life, so that the service life of the clutch member can be longer. Those skilled in the art will appreciate that the features and advantages described above with respect to the planetary gear remain applicable to the clutch member and will not be described in detail herein.
In another aspect of the present invention, a washing machine is provided. According to an embodiment of the present invention, a washing machine includes the above-described clutch member.
According to the embodiment of the present invention, the specific type of the washing machine is not particularly limited, and the washing machines commonly used in the art may be any type, such as a full-automatic washing machine, and the like, and those skilled in the art may select and design the washing machine accordingly according to the applicable customer group of the washing machine, and details thereof are not repeated herein.
It should be noted that the washing machine includes other necessary components and structures besides the clutch component, taking the full-automatic washing machine as an example, specifically, such as a housing, a drum, a circuit board, a control panel, a display panel or a power supply, etc., and those skilled in the art can make corresponding additions and designs according to the specific type and use requirements of the washing machine, and details are not described herein again.
In summary, according to the embodiments of the present invention, the present invention provides a washing machine, in which the service life of the clutch part is longer, thereby increasing the service life and long-term use stability of the washing machine. Those skilled in the art will appreciate that the features and advantages described above with respect to the planetary gear and clutch assembly are applicable to the washing machine and will not be described in detail herein.
In the description of the present invention, it is to be understood that the terms "center", "front", "back", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of describing and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A planetary gear, comprising:
the gear body is formed by plastic and is annular, a mounting hole is formed in the center of the gear body, a plurality of external gears are arranged on the outer edge of the gear body, a first inner flange and a second inner flange are respectively arranged at the ends, close to the mounting hole, of the front face and the back face of the gear body, and a first outer flange and a second outer flange are respectively arranged at the ends, far away from the mounting hole, of the front face and the back face of the gear body;
the first reinforcing ribs are arranged on the front face of the gear body, and each first reinforcing rib connects the first inner flange with the first outer flange;
the plurality of second reinforcing ribs are arranged on the back face of the gear body, and each second reinforcing rib connects the second inner flange with the second outer flange;
wherein orthographic projections of the plurality of first reinforcing ribs on the gear body do not coincide with orthographic projections of the plurality of second reinforcing ribs on the gear body;
the width of the first reinforcing rib is kept constant in the radial direction of the gear body, and the width of the second reinforcing rib is kept constant in the radial direction of the gear body;
the width of the joint of the first reinforcing rib and the first inner flange is equal to that of the first reinforcing rib, and the width of the joint of the first reinforcing rib and the first outer flange is equal to that of the first reinforcing rib;
the width of the joint of the second reinforcing rib and the second inner flange is equal to that of the second reinforcing rib, and the width of the joint of the second reinforcing rib and the second outer flange is equal to that of the second reinforcing rib.
2. The planetary gear according to claim 1, wherein the number of the first ribs is 3 to 6.
3. The planetary gear according to claim 1, wherein the number of the second ribs is 3 to 6.
4. A method of manufacturing a planetary gear, comprising:
carrying out an injection molding process on the plastic raw material so as to obtain a molded injection molding piece;
annealing the molded injection-molded part to obtain the planetary gear;
wherein the plastic raw material is polyformaldehyde, and the water content of the plastic raw material is 0.12-0.25 w/w%.
5. The method of claim 4, wherein the annealing process comprises: and soaking the molded injection molding piece in hot water at 75-85 ℃ for 1.5-2.5 hours.
6. The method of claim 4, wherein after the injection molding process, the method further comprises:
and standing the molded injection molding piece after demolding for not less than 10 hours so as to release the residual stress of the molded injection molding piece in the injection molding process.
7. A clutch member comprising the planetary gear according to any one of claims 1 to 3.
8. A washing machine characterized by comprising the clutch member as claimed in claim 7.
CN201810458355.3A 2018-05-14 2018-05-14 Planetary gear, manufacturing method thereof, clutch component and washing machine Active CN110486446B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810458355.3A CN110486446B (en) 2018-05-14 2018-05-14 Planetary gear, manufacturing method thereof, clutch component and washing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810458355.3A CN110486446B (en) 2018-05-14 2018-05-14 Planetary gear, manufacturing method thereof, clutch component and washing machine

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Publication Number Publication Date
CN110486446A CN110486446A (en) 2019-11-22
CN110486446B true CN110486446B (en) 2021-11-23

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