CN114738456A - Main transmission gear of electric bicycle and plastic forming process thereof - Google Patents
Main transmission gear of electric bicycle and plastic forming process thereof Download PDFInfo
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- CN114738456A CN114738456A CN202210391335.5A CN202210391335A CN114738456A CN 114738456 A CN114738456 A CN 114738456A CN 202210391335 A CN202210391335 A CN 202210391335A CN 114738456 A CN114738456 A CN 114738456A
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- Prior art keywords
- main body
- wall
- teeth
- electric bicycle
- transmission gear
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/17—Toothed wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/06—Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Forging (AREA)
Abstract
The invention discloses a main transmission gear of an electric bicycle, the main body of which is a hollow cylinder structure, the inner wall and the outer wall of the main body are respectively provided with inner teeth and outer teeth, and the main body is an integral structure formed by extrusion, and the plastic forming process comprises the following steps: firstly, blanking; ② non-oxidation isothermal spheroidizing annealing; shot blasting, blank making and lubricating treatment; cold extrusion, blank making, shot blasting and lubricating treatment; sixthly, cold extruding the inner and outer teeth, machining and carburizing and quenching. The invention adopts a production and processing technology of warm forging clean approximate forming, improves the comprehensive mechanical property of the main transmission gear of the electric bicycle, reduces the investment of processing equipment, improves the production efficiency, shortens the production period, saves raw materials, reduces the production cost and ensures the product quality.
Description
Technical Field
The invention belongs to the field of forging processing, and particularly relates to a production process of a main transmission gear of an electric bicycle.
Background
The main transmission gear of the electric bicycle is mainly applied to the transmission system of the electric bicycle. The main transmission gear inputs the power of the motor to the driven gear. The existing processing method of the main transmission gear of the electric bicycle adopts the traditional processing technology to produce the original rod through turning, gear shaping, gear hobbing and the like, the internal structure is loose, the comprehensive mechanical property is poor, the investment of mechanical equipment is large, the processing cost is high, the manufacturing period is long, and the raw material consumption is high, so that the development trend cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention mainly solves the problems of poor comprehensive mechanical property, large investment of mechanical equipment, high raw material consumption, high processing cost, long manufacturing period and the like of the main transmission gear of the existing electric bicycle, and provides a production and processing process for warm forging cleaning and near forming.
The invention is realized by the following technical scheme:
the main transmission gear of the electric bicycle is of a hollow cylindrical structure, inner teeth and outer teeth are arranged on the inner wall and the outer wall of the main body respectively, and the main body is of an integral structure formed by extrusion.
The internal teeth and the external teeth are arranged along the axis direction of the main body in a staggered mode.
An inner annular clamping groove is machined on the inner wall of the main body, the inner teeth are arranged at the lower end of the inner wall of the main body, an outer annular clamping groove is machined at the lower end of the outer teeth on the outer wall of the main body, and steps with the outer diameter of the outer teeth in a decreasing structure are machined at the upper end of the outer teeth.
The plastic forming process comprises the following steps:
feeding: cutting the metal bar by a circular saw;
② non-oxidation isothermal spheroidizing annealing: putting the cut rod material into a pit furnace, heating to 770 +/-5 ℃, keeping the temperature for 6 hours, slowly cooling to 680 ℃, keeping the temperature for 4 hours, cooling to 500 ℃ along with the furnace, and discharging; the spheroidization rate is more than or equal to 80 percent, and the surface hardness of the blank is less than or equal to 80 HRB;
shot blasting, blank making and lubricating treatment;
fourthly, cold extrusion: upsetting the lubricated blank, performing backward extrusion to form a hollow cylindrical structure with a bottom, and removing the bottom to form a hollow cylindrical structure main body;
making blank, shot blasting and lubricating;
sixthly, cold extruding the inner and outer teeth: putting the lubricated blank into a die, and extruding to form internal teeth and external teeth on the inner wall and the outer wall of the main body;
and (c) machining: turning the formed blank of the inner and outer teeth to form an inner annular clamping groove on the inner wall, an outer annular clamping groove on the outer wall and a step with a decreasing structure at the outer diameter of the upper end of the outer teeth;
eighthly, carburizing and quenching: and performing surface carburization treatment on the processed product, wherein the carburized layer is 0.6-1mm, and the surface hardness after heat treatment is 58-60 HRC.
Compared with the prior art, the invention has the following beneficial effects:
aiming at the defects of the existing production process, the invention adopts a production processing process of warm forging cleaning and near forming, improves the comprehensive mechanical property of the main transmission gear of the electric bicycle, reduces the investment of processing equipment, improves the production efficiency, shortens the production period, saves raw materials, reduces the production cost and also ensures the product quality.
Drawings
FIG. 1 is a schematic view of an automatic bicycle drive transmission according to an embodiment of the present invention;
FIG. 2 is a bottom view of FIG. 1;
FIG. 3 is a schematic view of a pre-machined forged configuration of an automatic bicycle drive gear;
FIG. 4 is a flow chart of a blank forging deformation process according to an embodiment of the invention.
Number in the figure: 1. main part, 2, internal tooth, 3, external tooth, 4, interior annular draw-in groove, 5, outer annular draw-in groove.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples with reference to the accompanying drawings.
Example (b): referring to fig. 1 and 2, a main transmission gear of an electric bicycle is characterized in that a main body 1 of the main transmission gear is a hollow cylindrical structure, inner teeth 2 and outer teeth 3 are respectively arranged on the inner wall and the outer wall of the main body 1, the inner teeth 2 and the outer teeth 3 are arranged in a staggered mode along the axis direction of the main body 1, the main body 1 is of an integral structure formed by extrusion, an inner annular clamping groove 4 is machined in the inner wall of the main body 1, the inner teeth 2 are arranged at the lower end of the inner wall of the main body 1, an outer annular clamping groove 5 is machined in the lower end of the outer teeth 3 in the outer wall of the main body 1, and steps with the outer diameter of the outer teeth 3 in a decreasing structure are machined in the upper end of the outer teeth 3.
Referring to fig. 3 and 4, the plastic forming process includes the following steps:
feeding: selecting a 20CrMnTi round bar material with the diameter of 50mm, and cutting out a metal bar material by a circular saw according to the drawing size;
② non-oxidation isothermal spheroidizing annealing: putting the cut rod material into a pit furnace, heating to 770 +/-5 ℃, keeping the temperature for 6 hours, slowly cooling to 680 ℃, keeping the temperature for 4 hours, cooling to 500 ℃ along with the furnace, and discharging; the spheroidization rate is more than or equal to 80 percent, and the surface hardness of the blank is less than or equal to 80 HRB;
shot blasting, blank making and lubricating treatment, namely putting the bar stock into a crawler type shot blasting machine for shot blasting treatment to improve the adhesive force of a surface coating in the next procedure, chamfering two ends of the bar stock, and lubricating the surface of the blank to ensure surface lubrication and create conditions for cold forging metal flow;
fourthly, cold extrusion: firstly upsetting the lubricated blank, then performing backward extrusion to form a hollow cylindrical structure with a bottom, and then removing the bottom to form a hollow cylindrical structure main body 1;
turning the pressed blank into a required shape, putting the blank into a crawler-type shot blasting machine for shot blasting treatment to improve the adhesive force of a surface coating in the next process, and lubricating the surface of the blank to ensure surface lubrication and create conditions for cold forging metal flow;
sixthly, cold extruding the inner and outer teeth: putting the lubricated blank into a die, and extruding to form internal teeth 2 and external teeth 3 on the inner wall and the outer wall of the main body 1;
and (c) machining: turning the blank with the formed inner and outer teeth according to the requirements of a drawing to form an inner annular clamping groove 4 on the inner wall, an outer annular clamping groove 5 on the outer wall and a step with a decreasing structure on the outer diameter of the upper end of the outer tooth 3;
eighthly, carburizing and quenching: and performing surface carburization treatment on the machined product, wherein the carburized layer is 0.6-1mm, and the surface hardness after heat treatment is 58-60 HRC.
Ninthly, cleaning: and (3) putting the carburized and quenched product into a cleaning machine for cleaning, and removing impurities such as surface oil stains, scrap iron and the like.
The embodiments are only for the convenience of understanding the technical solutions of the present invention, and do not limit the scope of the present invention, and any simple modifications, equivalent changes and modifications made to the above solutions without departing from the contents of the technical solutions of the present invention or the technical essence of the present invention still fall within the scope of the present invention.
Claims (4)
1. The main transmission gear of the electric bicycle is characterized in that an inner tooth (2) and an outer tooth (3) are respectively arranged on the inner wall and the outer wall of a main body (1) of the main transmission gear of the electric bicycle; the main body (1) is an integral structure formed by extrusion.
2. The main transmission gear of the electric bicycle according to claim 1, characterized in that the inner teeth (2) and the outer teeth (3) are arranged along the axis of the main body (1) in a staggered manner.
3. The electric bicycle final drive gear of claim 2, wherein: an inner annular clamping groove (4) is machined in the inner wall of the main body (1), the inner teeth (2) are arranged at the lower end of the inner wall of the main body (1), an outer annular clamping groove (5) is machined in the lower end of the outer teeth (3) on the outer wall of the main body (1), and steps with the outer diameter of the outer teeth (3) in a decreasing structure are machined in the upper end of the outer teeth (3).
4. The electric bicycle final drive gear of claim 2, wherein: the plastic forming process comprises the following steps:
feeding: cutting a metal bar by a circular saw;
② non-oxidation isothermal spheroidizing annealing: putting the cut rod material into a pit furnace, heating to 770 +/-5 ℃, keeping the temperature for 6 hours, slowly cooling to 680 ℃, keeping the temperature for 4 hours, cooling to 500 ℃ along with the furnace, and discharging;
shot blasting, blank making and lubricating treatment;
fourthly, cold extrusion: upsetting the lubricated blank, performing backward extrusion to form a hollow cylindrical structure with a bottom, and removing the bottom to form a hollow cylindrical structure main body (1);
making blank, shot blasting and lubricating;
sixthly, cold extruding the inner and outer teeth: putting the lubricated blank into a die, and extruding to form internal teeth (2) and external teeth (3) on the inner wall and the outer wall of the main body (1);
and (c) machining: turning the blank with the formed inner and outer teeth to form an inner annular clamping groove (4) on the inner wall, wherein the outer diameters of the upper ends of the outer annular clamping groove (5) and the outer teeth (3) on the outer wall are steps with a decreasing structure;
eighthly, carburizing and quenching: and performing surface carburization treatment on the machined product, wherein the carburized layer is 0.6-1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210391335.5A CN114738456A (en) | 2022-04-14 | 2022-04-14 | Main transmission gear of electric bicycle and plastic forming process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210391335.5A CN114738456A (en) | 2022-04-14 | 2022-04-14 | Main transmission gear of electric bicycle and plastic forming process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114738456A true CN114738456A (en) | 2022-07-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210391335.5A Withdrawn CN114738456A (en) | 2022-04-14 | 2022-04-14 | Main transmission gear of electric bicycle and plastic forming process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114738456A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2484248Y (en) * | 2001-05-08 | 2002-04-03 | 王长维 | Chain-less speed-variable electric bicycle |
| CN201354838Y (en) * | 2009-02-11 | 2009-12-02 | 宁波北斗科技有限公司 | Gear of metallic framework composite plastic material |
| EP2141068A1 (en) * | 2008-06-30 | 2010-01-06 | Chuan Sheng Chen | Electric bicycle |
| KR20140038056A (en) * | 2012-09-19 | 2014-03-28 | 주식회사 만도 | Drive unit for electric bicycle |
| CN104589002A (en) * | 2014-11-20 | 2015-05-06 | 江苏威鹰机械有限公司 | Manufacturing technology of hollow outer gear of electric forklift driving flange |
| CN207195602U (en) * | 2017-08-09 | 2018-04-06 | 江苏威鹰机械有限公司 | Farm tractor main clutch |
| CN107984182A (en) * | 2017-12-17 | 2018-05-04 | 江苏威鹰机械有限公司 | New-energy automobile gear reducer parking gear manufacturing process |
-
2022
- 2022-04-14 CN CN202210391335.5A patent/CN114738456A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2484248Y (en) * | 2001-05-08 | 2002-04-03 | 王长维 | Chain-less speed-variable electric bicycle |
| EP2141068A1 (en) * | 2008-06-30 | 2010-01-06 | Chuan Sheng Chen | Electric bicycle |
| CN201354838Y (en) * | 2009-02-11 | 2009-12-02 | 宁波北斗科技有限公司 | Gear of metallic framework composite plastic material |
| KR20140038056A (en) * | 2012-09-19 | 2014-03-28 | 주식회사 만도 | Drive unit for electric bicycle |
| CN104589002A (en) * | 2014-11-20 | 2015-05-06 | 江苏威鹰机械有限公司 | Manufacturing technology of hollow outer gear of electric forklift driving flange |
| CN207195602U (en) * | 2017-08-09 | 2018-04-06 | 江苏威鹰机械有限公司 | Farm tractor main clutch |
| CN107984182A (en) * | 2017-12-17 | 2018-05-04 | 江苏威鹰机械有限公司 | New-energy automobile gear reducer parking gear manufacturing process |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220712 |
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| WW01 | Invention patent application withdrawn after publication |