CN111516792A - Novel material crank for electric bicycle and preparation method thereof - Google Patents
Novel material crank for electric bicycle and preparation method thereof Download PDFInfo
- Publication number
- CN111516792A CN111516792A CN202010382517.7A CN202010382517A CN111516792A CN 111516792 A CN111516792 A CN 111516792A CN 202010382517 A CN202010382517 A CN 202010382517A CN 111516792 A CN111516792 A CN 111516792A
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- crank
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- electric bicycle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M3/00—Construction of cranks operated by hand or foot
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/06—Polymer mixtures characterised by other features having improved processability or containing aids for moulding methods
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The invention discloses a novel material crank for an electric bicycle and a preparation method thereof, wherein the novel material crank comprises a crank main body, a connecting hole and a mounting hole, wherein the mounting hole is formed in one end of the crank main body, the connecting hole is formed in the other end of the crank main body, the crank main body is integrally formed by molding compound or engineering plastic, a threaded hole is formed in the middle of the position of the mounting hole, and a round sleeve matched with the threaded hole in size is attached to the threaded hole; the crank comprises, by weight, 30-36 parts of resin, 3-6 parts of a toughening agent, 17-22 parts of a flame retardant, 7-9 parts of an auxiliary flame retardant, 0.1-0.6 part of a lubricant, 0.4-1 part of a release agent, 0.1-0.3 part of an antioxidant, 27-33 parts of glass fiber, 5-7 parts of nano bamboo fiber, 3-5 parts of a filler and 4.5-6 parts of a light stabilizer.
Description
Technical Field
The invention relates to the field of reinforced nylon plastics, in particular to a crank for an electric bicycle made of a new material and a preparation method of the crank.
Background
The development of plastic technology is changing day by day, the development of new materials aiming at brand new applications, the performance perfection of the existing material market and the performance improvement aiming at special applications can be called several important directions of new material development and application innovation: novel high thermal conductivity bioplastics; a color-changeable plastic film; novel bulletproof plastics; plastic capable of reducing automobile noise. At present, the application of plastics to replace natural materials is expanding internationally, and scientists around the world actively search for new high-performance thermoplastics to replace metal and wood through various experiments, which becomes an important part for enterprises to strive for more households and expand market share.
The crank of bicycle, electric motor car is a very ripe part, and current crank adopts steel casting integrated into one piece usually, and the cost is higher relatively, and weight does not accord with current national standard electric motor car lightweight concept moreover, also does not accord with energy-concerving and environment-protective direction. Meanwhile, with the rapid development of the current social technology, the new products are developed day by day, a great deal of new inventions are produced, some products are gradually improved, the requirements of some high-temperature resistant nylons in the market are gradually increased, the high-temperature resistant performance of some nylons is not good, the efficiency of producing the new products is low, and the yield is seriously influenced. Therefore, the applicant develops a crank made of a new material and a preparation method thereof on the basis, and the crank is low in cost, energy-saving and environment-friendly under the condition of improving the original performance.
Disclosure of Invention
The invention aims to provide a novel material crank for an electric bicycle and a preparation method thereof aiming at the defects of the prior art, so that the problems of transverse instability of a beam body caused by the fact that a support of the beam body of a bridge is hollow and longitudinal beam falling of the beam body caused by overlarge longitudinal displacement are solved, and the support can be quickly replaced.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A crank for an electric bicycle made of a new material comprises a crank main body, a connecting hole and a mounting hole, wherein the mounting hole is formed in one end of the crank main body, the connecting hole is formed in the other end of the crank main body, the crank main body is integrally formed by molding compound or engineering plastic, a threaded hole is formed in the middle of the position of the mounting hole, and a round sleeve matched with the threaded hole in size is attached to the threaded hole;
a square hole is formed in the middle of the connecting hole, four corners of the square hole are symmetrical forming surfaces, a limiting block is fixed at the bottom of the square hole, a square sleeve matched with the square hole is inwards inlaid in the square hole, each square sleeve is provided with a limiting block, and the square sleeves are square holes and can be sleeved together;
the crank main body is provided with a connecting hole, the connecting hole is provided with an upper hole and a lower hole, one hole is circular, the other hole is a square hole, the round hole is arranged on the opposite surface of the square hole, and the plane where the square hole is located is of a counter bore circular structure.
The square holes and the round holes are matched to form connecting holes, and the connecting holes are symmetrically communicated or are two sections of connecting holes which are symmetrically step-shaped.
Further, the crank component comprises 30-36 parts of resin, 3-6 parts of toughening agent, 17-22 parts of flame retardant, 7-9 parts of auxiliary flame retardant, 0.1-0.6 part of lubricant, 0.4-1 part of mold release agent, 0.1-0.3 part of antioxidant, 27-33 parts of glass fiber, 5-7 parts of nano bamboo fiber, 3-5 parts of filler and 4.5-6 parts of light stabilizer.
Further, the crank component comprises 32 parts of resin, 4 parts of toughening agent, 20 parts of flame retardant, 8 parts of auxiliary flame retardant, 0.5 part of lubricant, 0.6 part of mold release agent, 0.3 part of antioxidant, 29 parts of glass fiber, 32 parts of ceramic fiber, 6 parts of nano bamboo fiber, 4 parts of filler and 5.5 parts of light stabilizer.
Further, the toughening agent is a mixture of ethylene octene copolymer and one of maleic anhydride grafted ethylene octene copolymer or maleic anhydride grafted ethylene propylene diene monomer rubber according to a ratio of 1:1.5, wherein any two of the ethylene octene copolymer and the maleic anhydride grafted ethylene propylene diene monomer rubber are mixed.
Furthermore, the filler is a mixture of an inorganic filler and a polyurethane-nano microsphere composite light foam filler, and the mass ratio of the inorganic filler to the polyurethane-nano microsphere composite light foam filler is 1: 2.5.
Further, the flame retardant is one of brominated polystyrene or high molecular weight brominated epoxy resin, and the auxiliary flame retardant is antimony trioxide.
Further, the lubricant is prepared by mixing calcium stearate and vinyl bis-stearamide according to a ratio of 2: 1.
Further, the mold release agent is white oil, the antioxidant is a mixture of PR071-3 and 168 according to a ratio of 1:2, and the glass fibers are ceramic fibers with monofilament diameters larger than that of the glass fibers.
A preparation method of a crank for an electric bicycle made of a new material comprises the following specific preparation steps:
s1, raw material treatment: placing the resin in a drying box at 120 ℃ for drying for 4 hours to remove water; putting the dried resin mixed toughening agent into a mixer to mix for 5-10 minutes, adding the flame retardant, the antioxidant, the release agent and the lubricant to mix, fully stirring and uniformly mixing the components, and discharging the uniformly mixed raw materials for later use;
s2, mixing and stirring the mixture obtained in the step S1 with glass fiber, ceramic fiber, nano bamboo fiber, filler and light stabilizer for 15 minutes, and discharging the raw materials for later use;
s3, melt extrusion: adding the uniformly mixed raw materials in s3 into a double-screw extruder, fully melting and mixing, and then extruding;
s4, finished product processing: and (3) putting the extruded materials into a molding machine according to the molding proportion to prepare a crank, molding and packaging.
The invention has the beneficial effects that:
the material has the advantages of high strength and good mechanical property, and the prepared material has excellent physical property and high temperature resistance, can be further applied to the fields of automobile industry, electronic and electric appliance industry, mechanical equipment and the like, and has wide industrial application prospect.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a side view of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, but is not limited to the details of the description.
As shown in fig. 1-2: a new material crank for an electric bicycle comprises a crank main body 1, a connecting hole 2 and a mounting hole 3, wherein the mounting hole 3 is formed in one end of the crank main body 1, the connecting hole 2 is formed in the other end of the crank main body, the crank main body 1 is integrally formed by molding compound or engineering plastic, a threaded hole is formed in the middle of the position of the mounting hole 3, and a round sleeve matched with the threaded hole in size is attached to the threaded hole;
a square hole is formed in the middle of the position of the connecting hole 2, four corners of the square hole are symmetrical forming surfaces, a limiting block is fixed at the bottom of the square hole, a square sleeve matched with the square hole is inwards inlaid in the square hole, each square sleeve is provided with a limiting block, and the square sleeves are square holes and can be sleeved together;
two holes reach about connecting hole 2 on the crank main part 1 respectively, one is circular, and one is the square hole, the round hole sets up on with the square hole opposite face, the plane that the square hole is located is counter bore circle structure.
The square hole and the round hole are matched to form a connecting hole 2, and the connecting holes 2 are symmetrically communicated or are two sections of connecting holes which are symmetrically step-shaped.
In the embodiment, the crank component comprises 30-36 parts of resin, 3-6 parts of toughening agent, 17-22 parts of flame retardant, 7-9 parts of auxiliary flame retardant, 0.1-0.6 part of lubricant, 0.4-1 part of mold release agent, 0.1-0.3 part of antioxidant, 27-33 parts of glass fiber, 5-7 parts of nano bamboo fiber, 3-5 parts of filler and 4.5-6 parts of light stabilizer.
In this embodiment, the crank component includes 32 parts of resin, 4 parts of toughening agent, 20 parts of flame retardant, 8 parts of auxiliary flame retardant, 0.5 part of lubricant, 0.6 part of mold release agent, 0.3 part of antioxidant, 29 parts of glass fiber, 32 parts of ceramic fiber, 6 parts of nano bamboo fiber, 4 parts of filler, and 5.5 parts of light stabilizer.
In this embodiment, the toughening agent is a mixture of ethylene octene copolymer and either one of maleic anhydride grafted ethylene octene copolymer or maleic anhydride grafted ethylene propylene diene monomer rubber in a ratio of 1:1.5, wherein any two of the two are mixed.
In the embodiment, the filler is a mixture of an inorganic filler and a polyurethane-nanosphere composite light foam filler, and the mass ratio of the inorganic filler to the polyurethane-nanosphere composite light foam filler is 1: 2.5.
In this embodiment, the flame retardant is one of brominated polystyrene or high molecular weight brominated epoxy resin, and the auxiliary flame retardant is antimony trioxide.
In this example, the lubricant is selected from calcium stearate and vinyl bis stearamide mixed in a 2:1 ratio.
In the embodiment, the release agent is white oil, the antioxidant is a mixture of PR071-3 and 168 according to a ratio of 1:2, and the glass fibers are ceramic fibers with a monofilament diameter larger than that of the glass fibers.
The light stabilizer is an ultraviolet light absorber and a corresponding compound thereof
A preparation method of a crank for an electric bicycle made of a new material comprises the following specific preparation steps:
s1, raw material treatment: placing the resin in a drying box at 120 ℃ for drying for 4 hours to remove water; putting the dried resin mixed toughening agent into a mixer to mix for 5-10 minutes, adding the flame retardant, the antioxidant, the release agent and the lubricant to mix, fully stirring and uniformly mixing the components, and discharging the uniformly mixed raw materials for later use;
s2, mixing and stirring the mixture obtained in the step S1 with glass fiber, ceramic fiber, nano bamboo fiber, filler and light stabilizer for 15 minutes, and discharging the raw materials for later use;
s3, melt extrusion: adding the uniformly mixed raw materials in s3 into a double-screw extruder, fully melting and mixing, and then extruding;
s4, finished product processing: and (3) putting the extruded materials into a molding machine according to the molding proportion to prepare a crank, molding and packaging.
The first embodiment is as follows: the crank component comprises 32 parts of resin, 4 parts of toughening agent, 20 parts of flame retardant, 8 parts of auxiliary flame retardant, 0.5 part of lubricant, 0.6 part of release agent, 0.3 part of antioxidant, 29 parts of glass fiber, 32 parts of ceramic fiber, 6 parts of nano bamboo fiber, 4 parts of filler and 5.5 parts of light stabilizer.
Controlling the stirring speed to be 600r/min and the stirring time to be 10min according to the steps.
The temperatures in the twin-screw extruder were respectively: the temperature of the first zone is 265 ℃, the temperature of the second zone is 265 ℃, the temperature of the third zone is 265 ℃, the temperature of the fourth zone is 280 ℃, the temperature of the fifth zone is 280 ℃, the temperature of the sixth zone is 230 ℃, the temperature of the seventh zone is 230 ℃, the temperature of the eighth zone is 230 ℃, the temperature of a die head is 260 ℃, the vacuum pressure is more than or equal to 0.06pa, and the crank die is manufactured in a forming machine after discharging.
The second embodiment is as follows:
35 parts of resin, 5 parts of toughening agent, 20 parts of flame retardant, 7 parts of auxiliary flame retardant, 0.5 part of lubricant, 0.8 part of release agent, 0.2 part of antioxidant, 30 parts of glass fiber, 6 parts of nano bamboo fiber, 5 parts of filler and 5 parts of light stabilizer.
Controlling the stirring speed to be 600r/min and the stirring time to be 10min according to the steps.
The temperatures in the twin-screw extruder were respectively: the temperature of the first zone is 265 ℃, the temperature of the second zone is 265 ℃, the temperature of the third zone is 265 ℃, the temperature of the fourth zone is 280 ℃, the temperature of the fifth zone is 280 ℃, the temperature of the sixth zone is 230 ℃, the temperature of the seventh zone is 230 ℃, the temperature of the eighth zone is 230 ℃, the temperature of a die head is 260 ℃, the vacuum pressure is more than or equal to 0.06pa, and the crank die is manufactured in a forming machine after discharging.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (9)
1. The utility model provides a new material is crank for electric bicycle which characterized in that: the crank comprises a crank main body (1), a connecting hole (2) and a mounting hole (3), wherein the mounting hole (3) is formed in one end of the crank main body (1), the connecting hole (2) is formed in the other end of the crank main body, the crank main body (1) is integrally formed by molding compound or engineering plastic, a threaded hole is formed in the middle of the mounting hole (3), and a circular sleeve matched with the threaded hole in size is attached to the threaded hole;
a square hole is formed in the middle of the position of the connecting hole (2), four corners of the square hole are symmetrical forming surfaces, a limiting block is fixed at the bottom of the square hole, a square sleeve matched with the square hole is inwards inlaid in the square hole, each square sleeve is provided with a limiting block, and the square sleeves are square holes and can be sleeved together;
the crank is characterized in that the connecting holes (2) in the crank main body (1) are respectively provided with an upper hole and a lower hole, one hole is circular, the other hole is a square hole, the round holes are formed in the surfaces opposite to the square holes, and the plane where the square holes are located is of a counter bore circular structure.
The square hole and the round hole are matched to form a connecting hole (2), and the connecting holes (2) are symmetrically communicated or are symmetrically formed in a step shape by two sections.
2. The method for manufacturing a crank for an electric bicycle made of new material according to claim 1, wherein: the crank comprises, by weight, 30-36 parts of resin, 3-6 parts of a toughening agent, 17-22 parts of a flame retardant, 7-9 parts of an auxiliary flame retardant, 0.1-0.6 part of a lubricant, 0.4-1 part of a release agent, 0.1-0.3 part of an antioxidant, 27-33 parts of glass fiber, 5-7 parts of nano bamboo fiber, 3-5 parts of a filler and 4.5-6 parts of a light stabilizer.
3. The method for manufacturing a crank for an electric bicycle made of new material according to claim 2, wherein: the crank component comprises 32 parts of resin, 4 parts of toughening agent, 20 parts of flame retardant, 8 parts of auxiliary flame retardant, 0.5 part of lubricant, 0.6 part of release agent, 0.3 part of antioxidant, 29 parts of glass fiber, 32 parts of ceramic fiber, 6 parts of nano bamboo fiber, 4 parts of filler and 5.5 parts of light stabilizer.
4. The method for manufacturing a crank for an electric bicycle made of new material according to claim 2, wherein: the toughening agent is a mixture of ethylene octene copolymer and one of maleic anhydride grafted ethylene octene copolymer or maleic anhydride grafted ethylene propylene diene monomer rubber in a ratio of 1:1.5, wherein any two of the ethylene octene copolymer and the ethylene octene copolymer are mixed.
5. The method for manufacturing a crank for an electric bicycle made of new material according to claim 2, wherein: the filler is a mixture of inorganic filler and polyurethane-nano microsphere composite light foam filler, and the mass ratio of the inorganic filler to the polyurethane-nano microsphere composite light foam filler is 1: 2.5.
6. The method for manufacturing a crank for an electric bicycle made of new material according to claim 2, wherein: the flame retardant is one of brominated polystyrene or high molecular weight brominated epoxy resin, and the auxiliary flame retardant is antimony trioxide.
7. The method for manufacturing a crank for an electric bicycle made of new material according to claim 2, wherein: the lubricant is prepared by mixing calcium stearate and vinyl bis stearamide according to a ratio of 2: 1.
8. The method for manufacturing a crank for an electric bicycle made of new material according to claim 2, wherein: the release agent is white oil, the antioxidant is a mixture of PR071-3 and 168 according to a ratio of 1:2, and the glass fiber is a ceramic fiber with a monofilament diameter larger than that of the glass fiber.
9. The method for manufacturing a crank for an electric bicycle made of new material according to claim 2, wherein: the preparation method comprises the following specific steps:
s1, raw material treatment: placing the resin in a drying box at 120 ℃ for drying for 4 hours to remove water; putting the dried resin mixed toughening agent into a mixer to mix for 5-10 minutes, adding the flame retardant, the antioxidant, the release agent and the lubricant to mix, fully stirring and uniformly mixing the components, and discharging the uniformly mixed raw materials for later use;
s2, mixing and stirring the mixture obtained in the step S1 with glass fiber, ceramic fiber, nano bamboo fiber, filler and light stabilizer for 15 minutes, and discharging the raw materials for later use;
s3, melt extrusion: adding the uniformly mixed raw materials in s3 into a double-screw extruder, fully melting and mixing, and then extruding;
s4, finished product processing: and (3) putting the extruded materials into a molding machine according to the molding proportion to prepare a crank, molding and packaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010382517.7A CN111516792A (en) | 2020-05-08 | 2020-05-08 | Novel material crank for electric bicycle and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010382517.7A CN111516792A (en) | 2020-05-08 | 2020-05-08 | Novel material crank for electric bicycle and preparation method thereof |
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| Publication Number | Publication Date |
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| CN111516792A true CN111516792A (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010382517.7A Pending CN111516792A (en) | 2020-05-08 | 2020-05-08 | Novel material crank for electric bicycle and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112356966A (en) * | 2020-11-16 | 2021-02-12 | 天津一格科技有限公司 | Novel material crank for electric bicycle and preparation method thereof |
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|---|---|---|---|---|
| CN1861683A (en) * | 2005-04-28 | 2006-11-15 | 索尼株式会社 | Resin composition and molded product obtained therefrom |
| CN103407543A (en) * | 2013-08-14 | 2013-11-27 | 太仓浩湖五金制品有限公司 | Bicycle crank connection structure capable of being detached easily |
| TW201500253A (en) * | 2013-06-28 | 2015-01-01 | Shimano Kk | Composite bicycle component, composite bicycle crank arm, and method for manufacturing composite bicycle component |
| JP3209492U (en) * | 2016-08-09 | 2017-03-23 | ビバスポーツ コーポレーション リミテッドＶｉｖａｓｐｏｒｔｓ Ｃｏ．， Ｌｔｄ | Fitness bike or bicycle transmission |
| CN107031781A (en) * | 2017-04-25 | 2017-08-11 | 邢台革新机械设备制造有限公司 | A kind of bicycle crank and center shaft connecting structure |
| CN109810497A (en) * | 2019-03-06 | 2019-05-28 | 杨杰 | A kind of enhancing nylon plastic(s) and preparation method |
| CN209870657U (en) * | 2019-05-05 | 2019-12-31 | 鸿瑞天成科技（天津）有限公司 | Novel double-color plastic-coated crank |
| CN210087815U (en) * | 2019-04-26 | 2020-02-18 | 朱彤 | Crank handle |
-
2020
- 2020-05-08 CN CN202010382517.7A patent/CN111516792A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1861683A (en) * | 2005-04-28 | 2006-11-15 | 索尼株式会社 | Resin composition and molded product obtained therefrom |
| TW201500253A (en) * | 2013-06-28 | 2015-01-01 | Shimano Kk | Composite bicycle component, composite bicycle crank arm, and method for manufacturing composite bicycle component |
| CN103407543A (en) * | 2013-08-14 | 2013-11-27 | 太仓浩湖五金制品有限公司 | Bicycle crank connection structure capable of being detached easily |
| JP3209492U (en) * | 2016-08-09 | 2017-03-23 | ビバスポーツ コーポレーション リミテッドＶｉｖａｓｐｏｒｔｓ Ｃｏ．， Ｌｔｄ | Fitness bike or bicycle transmission |
| CN107031781A (en) * | 2017-04-25 | 2017-08-11 | 邢台革新机械设备制造有限公司 | A kind of bicycle crank and center shaft connecting structure |
| CN109810497A (en) * | 2019-03-06 | 2019-05-28 | 杨杰 | A kind of enhancing nylon plastic(s) and preparation method |
| CN210087815U (en) * | 2019-04-26 | 2020-02-18 | 朱彤 | Crank handle |
| CN209870657U (en) * | 2019-05-05 | 2019-12-31 | 鸿瑞天成科技（天津）有限公司 | Novel double-color plastic-coated crank |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112356966A (en) * | 2020-11-16 | 2021-02-12 | 天津一格科技有限公司 | Novel material crank for electric bicycle and preparation method thereof |
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Application publication date: 20200811 |