CN112815072A - EPS worm gear and preparation method thereof - Google Patents

EPS worm gear and preparation method thereof Download PDF

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Publication number
CN112815072A
CN112815072A CN202011577972.9A CN202011577972A CN112815072A CN 112815072 A CN112815072 A CN 112815072A CN 202011577972 A CN202011577972 A CN 202011577972A CN 112815072 A CN112815072 A CN 112815072A
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Prior art keywords
worm gear
eps
wear
eps worm
layer
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CN202011577972.9A
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Chinese (zh)
Inventor
郑梯和
袁绍军
胡天辉
陈碧帆
黄伟伟
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Zhuzhou Times Engineering Plastics Technology Co ltd
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Zhuzhou Times Engineering Plastics Technology Co ltd
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Priority to CN202011577972.9A priority Critical patent/CN112815072A/en
Publication of CN112815072A publication Critical patent/CN112815072A/en
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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
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • 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
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/0405—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres
    • C08J5/043—Reinforcing macromolecular compounds with loose or coherent fibrous material with inorganic fibres with glass fibres
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2427/18—Homopolymers or copolymers of tetrafluoroethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/14—Glass

Abstract

The invention provides an EPS worm gear, comprising: a metal shaft; the framework layer is arranged on the outer layer of the metal shaft; the wear-resistant layer is arranged on the outer layer of the framework layer; the framework layer is made of a reinforced material, and the reinforced material comprises a nylon material; the wear-resistant layer is a worm wheel outer ring prepared by a reaction injection molding method. The EPS worm gear is prepared by adopting reaction injection molding nylon, the advantages of abrasion resistance of the cast nylon can be combined, the light weight can be realized, the molding period is short, and the EPS worm gear has profound significance; the wear-resistant layer of the EPS worm gear is prepared by adopting reaction injection nylon, and the PA6 or PA66 fiber is used as a reinforcing material, so that the prepared EPS worm gear product has the advantages of good wear resistance, long service life and short forming process, and can form a tooth shape. The invention also provides a preparation method of the EPS worm gear.

Description

EPS worm gear and preparation method thereof
Technical Field
The invention belongs to the technical field of worm gears, and particularly relates to an EPS worm gear and a preparation method thereof.
Background
The EPS worm gear is a core component of an electronic power steering gear, and the main material for preparing the EPS worm gear at present is the composition of a plastic part (an abrasion-resistant layer) and metal, and also all plastic; the inner layer of the EPS worm gear structure is a framework, can be made of metal materials or glass fiber reinforced nylon materials, and the outer layer is an abrasion-resistant layer, mainly made of PA66 or PA12 or cast nylon and the like. The EPS worm gear is prepared by two processes of casting and injection molding, the tooth profile of the EPS worm gear can be cast by casting, and the cast EPS worm gear has good wear resistance, service life and the like, but can not realize light weight; the main material of the EPS worm gear is PA66, the wear resistance and fatigue life of the material are a great distance compared with casting, and the molding cycle is long.
Disclosure of Invention
In view of the above, the invention aims to provide an EPS worm gear and a preparation method thereof.
The invention provides an EPS worm gear, comprising:
a metal shaft;
the framework layer is arranged on the outer layer of the metal shaft;
the wear-resistant layer is arranged on the outer layer of the framework layer;
the framework layer is made of a reinforced material, and the reinforced material comprises a nylon material;
the wear-resistant layer is a worm wheel outer ring prepared by a reaction injection molding method.
Preferably, the reinforcing material further comprises a fibrous material;
the fibrous material comprises glass fibers and/or carbon fibers.
Preferably, the mass content of the fiber material in the reinforcing material is 30-70%.
Preferably, the thickness of the wear-resistant layer is 11-30 mm.
Preferably, the raw materials for preparing the outer ring of the worm gear comprise:
lactam, catalyst, blocked prepolymer, anti-wear agent and reinforcing material.
Preferably, the mass ratio of the lactam, the catalyst, the blocked prepolymer, the anti-wear agent and the reinforcing material is 100: (0.1-10): (1-15): (0.1-10): (1-30).
Preferably, the catalyst is selected from one or more of lactam magnesium halide, alkali metal and alkali metal lactam salt.
Preferably, the anti-wear agent is selected from one or more of silicon carbide, polytetrafluoroethylene and molybdenum disulfide.
Preferably, the reinforcing material is selected from one or more of carbon fiber, glass fiber and wollastonite.
The invention provides a preparation method of an EPS worm gear, which comprises the following steps:
preparing a worm wheel outer ring by adopting a reaction injection molding method to form a wear-resistant layer;
and filling the reinforcing material between the outer ring of the worm wheel and the metal shaft for injection molding to form a framework layer, thereby obtaining the EPS worm wheel.
The EPS worm gear is prepared by adopting reaction injection molding nylon, can combine the advantage of abrasion resistance of the cast nylon, can realize light weight, has short molding period and has profound significance. The wear-resistant layer of the EPS worm gear is prepared by adopting reaction injection nylon, and the PA6 or PA66 fiber is used as a reinforcing material, so that the prepared EPS worm gear product has the advantages of good wear resistance, long service life and short forming process, and can form a tooth shape.
Drawings
FIG. 1 is a schematic structural diagram of an outer ring of a worm gear prepared according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a metal shaft according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an EPS worm gear prepared by an embodiment of the invention;
FIG. 4 is a schematic structural diagram of an EPS worm gear prepared by an embodiment of the invention (the brown part is a PA6 or PA66 reinforced material);
FIG. 5 is a flow chart of a process for preparing a worm gear outer ring by reaction injection molding according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention. It should be understood that the embodiments of the present invention are only for illustrating the technical effects of the present invention, and are not intended to limit the scope of the present invention. In the examples, the methods used were all conventional methods unless otherwise specified.
The invention provides an EPS worm gear, comprising:
a metal shaft;
the framework layer is arranged on the outer layer of the metal shaft;
the wear-resistant layer is arranged on the outer layer of the framework layer;
the framework layer is made of a reinforced material, and the reinforced material comprises a nylon material;
the wear-resistant layer is a worm wheel outer ring prepared by a reaction injection molding method.
The invention has no special limitation on the material and the structural shape of the metal shaft, and the EPS worm gear of the numerical value of the technical personnel in the field can be used for manufacturing the metal shaft; the material of the metal shaft is preferably carbon steel, alloy steel or alloy aluminum. A schematic structural view of a metal shaft provided in an embodiment of the present invention is shown in fig. 2.
In the present invention, the reinforcing material preferably further includes a fibrous material; the nylon material preferably comprises PA6 and/or PA 66; the fibrous material preferably comprises glass fibres and/or carbon fibres; the mass content of the fiber material in the reinforcing material is preferably 30-70%, more preferably 40-60%, more preferably 45-55%, and most preferably 50%.
The structural shape of the framework layer is not particularly limited, and the framework layer is filled between the metal shaft and the wear-resistant layer by adopting the structural shape of the EPS worm gear framework layer well known to those skilled in the art. The structural schematic diagram of the EPS worm wheel provided by the embodiment of the invention is shown in fig. 4, and a brown part in fig. 4 is a skeleton layer-shaped structure.
In the invention, the thickness of the wear-resistant layer (outer ring of the worm wheel) is preferably 11-30 mm, more preferably 15-25 mm, more preferably 18-22 mm, and most preferably 20 mm.
The invention has no special limitation on the structural shape of the outer ring of the worm wheel, and the structural shape of the outer ring of the EPS worm wheel, which is well known to those skilled in the art, can be adopted. The structure schematic diagram of the outer ring of the worm wheel prepared by the embodiment of the invention is shown in figure 1.
In the invention, the raw materials for preparing the outer ring of the worm gear preferably comprise lactam, catalyst, blocked prepolymer, reinforcing material and wear-resisting agent.
In the present invention, the lactam preferably comprises one or both of caprolactam and laurolactam.
In the present invention, the catalyst is preferably a high activity catalyst, more preferably comprises one or more of lactam magnesium halide, alkali metal and alkali metal lactam salt; the lactam magnesium halide preferably comprises one or more of caprolactam magnesium bromide, caprolactam magnesium chloride and laurolactam magnesium bromide; the alkali metal preferably comprises one or both of potassium hydroxide and sodium hydroxide; the alkali metal lactam salt preferably comprises one or both of sodium caprolactam and potassium caprolactam.
In the present invention, the blocked prepolymer is preferably prepared by reacting a first raw material and a second raw material.
In the present invention, the first raw material preferably includes one or more of polyether polyol, polyol and polyamine; the polyether polyol preferably comprises PTMG (polytetramethylene glycol) or PEG (polyethylene glycol); the polyol preferably comprises ethylene glycol or glycerol; the polyamine preferably comprises hexamethylenetetramine.
In the present invention, the second raw material preferably includes one or more of isocyanate, isocyanate-polymer and lactam; the isocyanate polymer is preferably toluene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate or polymethylene polyphenyl polyisocyanate; the lactam preferably comprises caprolactam or laurolactam.
The present invention is not particularly limited to a specific method for reacting the first raw material and the second raw material, and those skilled in the art can perform corresponding reactions according to the components of the first raw material and the second raw material and the reaction principles and reaction methods well known to those skilled in the art to obtain the block prepolymer of the desired components.
In the present invention, the number average molecular weight of the block prepolymer is preferably 2000 to 30000, more preferably 5000 to 25000, more preferably 10000 to 20000, and most preferably 15000.
In the present invention, the anti-wear agent preferably includes one or more of silicon carbide, PTFE (polytetrafluoroethylene), and molybdenum disulfide; the PTFE is preferably PTFE micropowder.
In the present invention, the reinforcing material is preferably selected from one or more of carbon fiber, glass fiber and wollastonite.
In the present invention, the mass ratio of the lactam, the catalyst, the blocked prepolymer, the anti-wear agent and the reinforcing material is preferably 100: (0.1-10): (1-15): (0.1-10): (1 to 30), more preferably 100: (0.5-8): (3-10): (0.5-8): (5-25), more preferably 100: (1-6): (5-8): (1-6): (10-20), most preferably 100: (3-4): (6-7): (3-4): (13-16).
The invention provides a preparation method of an EPS worm gear, which comprises the following steps:
preparing a worm wheel outer ring by adopting a reaction injection molding method;
and filling the reinforcing material between the outer ring of the worm wheel and the metal shaft for injection molding to form a framework layer, thereby obtaining the EPS worm wheel.
The specific process flow of the reaction injection molding is not particularly limited, and the worm wheel outer ring is prepared by adopting a specific reaction injection molding method well known by the technical personnel in the field. The process flow of the reaction injection molding in the embodiment of the invention is shown in fig. 1.
In the present invention, the reaction injection molding method preferably includes:
and (4) injecting the material A and the material B into a mold after high-speed collision to obtain the outer ring of the worm wheel.
In the invention, the material A comprises lactam, catalyst, wear-resisting agent and reinforcing material; the material B comprises lactam and a blocked prepolymer; the mass ratio of the lactam in the material A to the lactam in the material B is preferably 1: (0.5 to 1.5), more preferably 1: (0.8 to 1.2), most preferably 1: 1.
in the invention, the material A and the material B are preferably heated and then collided at a high speed; the heating temperature is preferably 80-140 ℃, more preferably 90-130 ℃, more preferably 100-120 ℃, and most preferably 110 ℃; preferably, the temperature of the material A and the temperature of the material B are preferably 80-140 ℃, more preferably 90-130 ℃, more preferably 100-120 ℃ and most preferably 110 ℃ after the material A and the material B are filled with nitrogen for protection and then subjected to nitrogen replacement.
In the invention, the temperature of the die is preferably 140-180 ℃, more preferably 150-170 ℃, and most preferably 160 ℃.
In the present invention, it is preferable that the outer ring of the worm wheel further comprises:
and carrying out heat treatment on the obtained worm wheel outer ring.
In the invention, the temperature of the heat treatment is preferably 140-180 ℃, more preferably 150-170 ℃, and most preferably 160 ℃; the time of the heat treatment is preferably 6 to 20 hours, more preferably 10 to 15 hours, and most preferably 12 to 13 hours.
In the present invention, it is preferable that the outer ring of the worm wheel further comprises:
and trimming the outer ring of the worm wheel.
In the invention, the reaction injection molding refers to that two or more than two liquid monomers or prepolymers with low viscosity and low molecular weight are impacted and mixed under high pressure and then are immediately injected into a closed mould, so that a liquid mixture is generated in the mould; the reaction injection molding technology is a novel process technology, has high reaction speed, can be molded at one time, and has stable and controllable process; the reaction injection nylon adopts an anionic polymerization method, so that the molecular weight is large, the molecular structure is adjustable, the reaction injection nylon has remarkable advantages in the aspects of strength, rigidity, wear resistance, creep deformation and the like, and the reaction injection nylon has good temperature resistance and impact resistance.
In the present invention, it is preferable that the reinforcing material is filled between the worm wheel outer ring and the metal shaft and is placed in an injection mold to be injection-molded.
The wear-resistant layer of the EPS worm gear is prepared by adopting a reaction injection nylon method, a lightweight EPS worm gear structure is obtained, the EPS worm gear is prepared by adopting the reaction injection nylon method, the lightweight is realized, the process is simple, the molding period is short, the product performance is adjustable, the wear resistance and the fatigue performance are superior, the combination of the advantages of the cast nylon and the injection nylon is successfully realized, and the production process of the novel EPS worm gear is a novel production process of the EPS worm gear.
The EPS worm gear has a large market quantity and shows a trend of increasing year by year, and the market demand is more than 2000 million and 7 billion yuan at present and shows a trend of increasing year by year. According to the invention, reaction injection nylon is used as a wear-resistant layer of the EPS worm gear, and a PA6 or PA66 limiting reinforcing material is used as a skeleton structure, so that the prepared EPS worm gear has good wear resistance and can be formed into a tooth shape; the molding process is simple and the cost is low; the shock resistance is good; the fatigue resistance is good. The EPS worm gear preparation process provided by the invention can be used for forming the tooth profile, the forming period is short, and the process is stable; the prepared EPS worm gear has excellent low-temperature toughness and good wear resistance; the performance is adjustable, and the generation cost is relatively low.
The raw materials used in the following examples of the present invention are all commercially available products.
Example 1
Putting 50 parts by weight of caprolactam, 0.1 part by weight of sodium caprolactam (catalyst), 5 parts by weight of glass fiber (reinforcing material), 15 parts by weight of PTFE micro powder (wear-resisting agent) into a reaction kettle A, 50 parts by weight of caprolactam, and 5 parts by weight of block compound (prepared by polymerization reaction of polytetramethylene glycol and hexamethylene diisocyanate and having the number average molecular weight of 12000) into a reaction kettle B; heating the materials in the reaction kettle A and the reaction kettle B to 120 ℃, replacing the water in the system by nitrogen, and waiting for reaction injection molding under the protection of nitrogen.
Butting a nozzle of a reaction injection molding machine with an injection port of an EPS worm gear outer ring mold, injecting materials in a reaction kettle A and a reaction kettle B into a mold cavity of the mold after the materials are collided and mixed at a high speed through a mixing cavity of the reaction injection molding machine, keeping the temperature of the mold at 150 ℃, stopping heating after polymerizing for 2min, opening the mold, taking out the EPS worm gear outer ring, and carrying out heat treatment for 12 hours in a 160 ℃ oven.
And (3) placing the prepared EPS worm wheel outer ring and the metal shaft into an injection mold, filling a PA66 GF50 material (hub framework) between the worm wheel outer ring and the metal shaft for injection molding, forming the hub framework of the EPS worm wheel, and obtaining the EPS worm wheel.
Examples 2 to 7
An EPS worm gear was produced according to the method of example 1, differing from example 1 in that it was produced according to the amounts of the raw materials in Table 1.
Table 1 shows the proportions (parts by weight) of the respective materials used in the examples
Figure BDA0002864990870000061
Figure BDA0002864990870000071
Note: caprolactam and laurolactam in table 1 are the parts by weight of total caprolactam and laurolactam in reactor a and reactor B, and the mass ratio of caprolactam and laurolactam in reactor a to reactor B is 1: 1.
performance detection
The EPS worm wheel produced in the example of the present invention was tested for tensile strength, tensile elongation, notched impact strength (-40 ℃) and number of fatigue wear times according to the standards and methods in Table 2: the detection results are shown in table 2, and table 2 shows the performance detection results of the EPS worm wheel prepared in the embodiment of the invention.
Table 2 performance test results of EPS worm wheel prepared in the embodiment of the present invention
Figure BDA0002864990870000072
The EPS worm gear has a large market quantity and shows a trend of increasing year by year, and the market demand is more than 2000 million and 7 billion yuan at present and shows a trend of increasing year by year. According to the invention, reaction injection nylon is used as a wear-resistant layer of the EPS worm gear, and a PA6 or PA66 limiting reinforcing material is used as a skeleton structure, so that the prepared EPS worm gear has good wear resistance and can be formed into a tooth shape; the molding process is simple and the cost is low; the shock resistance is good; the fatigue resistance is good. The EPS worm gear preparation process provided by the invention can be used for forming the tooth profile, the forming period is short, and the process is stable; the prepared EPS worm gear has excellent low-temperature toughness and good wear resistance; the performance is adjustable, and the generation cost is relatively low.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. An EPS worm gear, comprising:
a metal shaft;
the framework layer is arranged on the outer layer of the metal shaft;
the wear-resistant layer is arranged on the outer layer of the framework layer;
the framework layer is made of a reinforced material, and the reinforced material comprises a nylon material;
the wear-resistant layer is a worm wheel outer ring prepared by a reaction injection molding method.
2. The EPS worm gear of claim 1, wherein the reinforcing material further comprises a fibrous material;
the fibrous material comprises glass fibers and/or carbon fibers.
3. The EPS worm gear of claim 2, wherein the fiber material is present in the reinforcing material in an amount of 30 to 70% by mass.
4. The EPS worm gear of claim 1, wherein the wear layer has a thickness of 11 to 30 mm.
5. The EPS worm gear of claim 1, wherein the worm gear outer ring is prepared from the following raw materials:
lactam, catalyst, blocked prepolymer, anti-wear agent and reinforcing material.
6. The EPS worm gear of claim 5, wherein the mass ratio of the lactam, the catalyst, the blocked prepolymer, the anti-wear agent, and the reinforcing material is 100: (0.1-10): (1-15): (0.1-10): (1-30).
7. The EPS worm gear of claim 5, wherein the catalyst is selected from one or more of lactam magnesium halides, alkali metals and alkali metal lactam salts.
8. The EPS worm gear of claim 1, wherein the wear resistant agent is selected from one or more of silicon carbide, polytetrafluoroethylene and molybdenum disulfide.
9. The EPS worm gear of claim 1, wherein the reinforcing material is selected from one or more of carbon fiber, glass fiber and wollastonite.
10. A method of making an EPS worm gear of claim 1 comprising:
preparing a worm wheel outer ring by adopting a reaction injection molding method to form a wear-resistant layer;
and filling the reinforcing material between the outer ring of the worm wheel and the metal shaft for injection molding to form a framework layer, thereby obtaining the EPS worm wheel.
CN202011577972.9A 2020-12-28 2020-12-28 EPS worm gear and preparation method thereof Pending CN112815072A (en)

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CN102200184A (en) * 2010-03-22 2011-09-28 郭文学 Multi-layer composite modified nylon gear/wheel and manufacture method thereof
CN104093622A (en) * 2012-02-13 2014-10-08 南阳工业株式会社 MDPS worm gear and method for manufacturing same
CN105542151A (en) * 2014-10-28 2016-05-04 株洲时代新材料科技股份有限公司 Quincuncial elastic member and preparation method thereof
CN105546092A (en) * 2014-10-28 2016-05-04 株式会社捷太格特 Gear and manufacturing method thereof
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113446378A (en) * 2021-07-21 2021-09-28 浙江汇丰汽车零部件股份有限公司 Gear structure of steering engine and preparation method thereof
CN113446378B (en) * 2021-07-21 2022-09-13 浙江汇丰汽车零部件股份有限公司 Gear structure of steering engine and preparation method thereof

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