CN109695697B - Gear and gear manufacturing method - Google Patents
Gear and gear manufacturing method Download PDFInfo
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- CN109695697B CN109695697B CN201910072709.5A CN201910072709A CN109695697B CN 109695697 B CN109695697 B CN 109695697B CN 201910072709 A CN201910072709 A CN 201910072709A CN 109695697 B CN109695697 B CN 109695697B
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- intermediate shaft
- connecting piece
- convex body
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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
- 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
- B29C45/14467—Joining articles or parts of a single article
- B29C45/14491—Injecting material between coaxial articles, e.g. between a core and an outside sleeve for making a roll
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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
- F16H57/00—General details of gearing
- F16H57/0018—Shaft assemblies for gearings
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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
- F16H2055/065—Moulded gears, e.g. inserts therefor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Gears, Cams (AREA)
Abstract
The embodiment of the invention discloses a gear, an intermediate shaft, a connecting piece and an outer part, wherein the intermediate shaft comprises a first section; the connecting piece comprises a hollow first circular convex body and a second circular convex body, the inner side surface of the second circular convex body is wrapped on the outer circumferential surface of the first circular convex body, and the outer circumferential surface of the first section is propped against the inner side surface of the first circular convex body; the second circular convex body is provided with an annular groove, the outer part comprises a third circular convex body and an annular clamping block matched with the annular groove in a clamping mode, the outer peripheral surface of the annular clamping block is connected with the inner side surface of the third circular convex body, and the outer peripheral surface of the third circular convex body is in a sawtooth shape. The embodiment of the invention also discloses a gear manufacturing method for manufacturing the intermediate shaft; and placing the intermediate shaft in a connecting piece mould, injection molding the connecting piece, forming an aggregate of the connecting piece and the intermediate shaft, placing the aggregate in an outer piece mould, and injection molding the outer piece. Compared with the gear manufacturing method in the prior art, the gear manufacturing method reduces the processing procedures, improves the production efficiency and reduces the production cost.
Description
Technical Field
The embodiment of the invention relates to the field of gear manufacturing in an electric power steering system and an intelligent braking system, in particular to a gear and a gear manufacturing method.
Background
Gears refer to mechanical elements with teeth on the rim that continuously mesh to transfer motion and power. Generally, a gear includes: an outer member having a rim with a saw-tooth outer peripheral surface; the intermediate shaft is coaxially arranged in the center of the outer part; and a connecting piece which is positioned between the outer part and the intermediate shaft and is used for connecting the outer part and the intermediate shaft, wherein the connecting piece is wrapped on the outer peripheral surface of the intermediate shaft and is abutted with the inner side surface of the outer part.
Currently, gear production typically requires four steps: a first step of injection molding the outer member on a first set of molds by pressing resin or plastic from a central position thereof; a second step of removing a gate portion of the injection molded outer member at a central position by means of machining; thirdly, manufacturing a metal piece intermediate shaft in a machining mode; and fourthly, coaxially placing the intermediate shaft and the outer part on a second set of dies, and producing the connecting part by a multi-point pressing resin or plastic injection molding mode.
According to the method for producing the gear, in the final forming process of the outer part, the gate part is removed in a machining mode, so that the number of working procedures is increased, the processing cost is increased due to secondary machining of the outer part, the manufacturing time is increased, and the production efficiency is influenced.
Disclosure of Invention
The embodiment of the invention provides a gear and a gear manufacturing method for an electric power steering system and an intelligent braking system, which are used for solving the problems of more processing procedures and higher processing cost of the gear manufacturing method.
In order to solve the technical problems, the embodiment of the invention provides the following technical scheme:
a gear, comprising:
an intermediate shaft comprising a first section;
the connecting piece comprises a first round convex body and a second round convex body; the first circular convex body is hollow, the inner side surface of the second circular convex body is wrapped on the outer peripheral surface of the first circular convex body, and the outer peripheral surface of the first section of the intermediate shaft is abutted against the inner side surface of the first circular convex body; the second round convex body is provided with an annular groove;
the outer part comprises an annular clamping block and a third circular convex body, the annular clamping block is matched with the annular groove in a clamping mode, the outer peripheral surface of the annular clamping block is fixedly connected with the inner side surface of the third circular convex body, and the outer peripheral surface of the third circular convex body is in a sawtooth shape.
Further, the outer peripheral surface of the first section of the intermediate shaft is connected with the inner side surface of the first circular convex body through a plurality of first tooth shapes and a plurality of first tooth grooves which are in clamping fit with the corresponding first tooth shapes, so that the contact area of the intermediate shaft and the connecting piece is increased.
Further, the annular groove is connected with the annular clamping block through a plurality of raised strips and a plurality of strip grooves matched with the corresponding raised strips in a clamping manner, so that the contact area of the connecting piece and the outer part is increased.
Further, annular flanges are arranged on the two end faces of the second circular convex body, and any point of the inner side face of each annular flange is equal to the distance from the radial direction of the two end faces of the second circular convex body to the outer peripheral face of the first circular convex body;
the two end faces of the second circular convex body are fixedly provided with a plurality of reinforcing ribs, the reinforcing ribs are uniformly distributed along the circumferential direction of the outer circumferential surface of the first circular convex body, and the reinforcing ribs are respectively connected with the outer circumferential surface of the first circular convex body and the inner side face of the annular flange.
Further, the annular groove is formed by recessing the outer peripheral surface of the second dome toward the radial direction of the second dome, and divides the second dome into a first connecting portion and a second connecting portion;
a plurality of first through grooves are formed in the first connecting part and the second connecting part, the first through grooves penetrate through two end faces of the first connecting part and two end faces of the second connecting part respectively, and the first through grooves in the first connecting part and the first through grooves in the second connecting part are uniformly distributed along the circumferential direction of the outer circumferential surface of the first circular convex body respectively; the two end surfaces of the annular clamping block are respectively provided with a plurality of first convex columns which are matched with the corresponding first through grooves in a clamping way.
Further, a plurality of second through grooves are formed in the first connecting portion and the second connecting portion, the second through grooves penetrate through two end faces of the first connecting portion and two end faces of the second connecting portion respectively, and the second through grooves in the first connecting portion and the second through grooves in the second connecting portion are distributed evenly along the circumferential direction of the outer circumferential surface of the first circular convex body respectively; a plurality of second convex columns which are in clamping fit with the corresponding second through grooves are arranged on two end faces of the annular clamping block;
the shortest distance between the second through groove and the inner side surface of the annular flange is smaller than the shortest distance between any one of the first through grooves and the inner side surface of the annular flange.
Further, a plurality of third through grooves are formed in the first connecting portion and the second connecting portion, the third through grooves are communicated with the corresponding second through grooves, and the area of the cross section of each third through groove is larger than that of the cross section of each second through groove; and a plurality of third convex columns which are matched with the corresponding third through grooves in a clamping way are fixedly connected to the end surfaces of the second convex columns.
Further, a plurality of fourth grooves are formed in the first connecting portion and the second connecting portion, the fourth grooves penetrate through two end faces of the first connecting portion and two end faces of the second connecting portion respectively, and the fourth grooves in the first connecting portion and the fourth grooves in the second connecting portion are distributed evenly along the circumferential direction of the outer circumferential surface of the first circular convex body respectively; the two end faces of the annular clamping block are respectively provided with a plurality of fourth convex columns which are matched with the corresponding fourth grooves in a clamping manner, and the fourth convex columns are hollow.
Further, the outer peripheral surface of the second circular convex body is connected with the inner side surface of the third circular convex body through a plurality of second tooth shapes and a plurality of second tooth grooves which are in clamping fit with the corresponding second tooth shapes, so that the contact area between the connecting piece and the outer part is increased.
In order to achieve the above object, an embodiment of the present invention further provides a gear manufacturing method, including:
manufacturing an intermediate shaft, wherein the intermediate shaft comprises a first section and a second section coaxially arranged with the first section;
placing the intermediate shaft in a connecting piece die, and injection molding a connecting piece, wherein a first through hole matched with a first section of the intermediate shaft and a first positioning blind hole matched with a second section of the intermediate shaft are formed in the connecting piece die, and the first through hole is communicated with the first positioning blind hole; the first section is arranged in the first through hole, and the second section is arranged in the first positioning blind hole; the connecting piece die is provided with a plurality of first water-thinning ports, the connecting piece die is subjected to injection molding through the first water-thinning ports so as to form the connecting piece, and the connecting piece is coated on the outer peripheral surface of the first section of the intermediate shaft and forms an aggregate of the connecting piece and the intermediate shaft;
placing the assembly in an outer part mould, and performing injection molding on an outer part, wherein the outer peripheral surface of the injection molded outer part is in a zigzag shape; the outer part die is provided with a second through hole matched with the connecting piece and a second positioning blind hole matched with the second section of the intermediate shaft, and the second through hole is communicated with the second blind hole; the connecting piece in the assembly and the first section of the intermediate shaft are arranged in the second through hole, and the second section of the intermediate shaft is arranged in the second positioning blind hole; the outer part mold is provided with a plurality of second water-thinning ports, and the outer part mold is subjected to injection molding through the second water-thinning ports so as to form the outer part and cover the outer peripheral surface of the connecting piece.
The beneficial effects achieved by the embodiment of the invention are as follows: compared with the manufacturing method of the gear with the sprue part removed by machining in the final injection molding process of the outer part in the prior art, the manufacturing method of the gear provided by the embodiment of the invention has the advantages that the processing procedures are reduced, the production efficiency is improved, and the production cost is reduced; compared with the gear manufacturing method for processing the external part in the prior art, the gear manufacturing method provided by the embodiment of the invention has the advantages that the external part with the highest functional requirement in the gear is put into the last procedure for processing, so that the influence on the external part in the post-processing process is reduced, and the qualification rate of a finished product is effectively improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of a gear according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the structure of an intermediate shaft according to an embodiment of the present invention;
FIG. 3 is a schematic view of a connector structure according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of the outer member structure of an embodiment of the present invention;
FIG. 5 is a schematic view of the internal structure of a gear according to an embodiment of the present invention;
fig. 6 is a flowchart of steps in a method of manufacturing a gear according to an embodiment of the present invention.
Reference numerals: 10. an intermediate shaft; 100. a first section; 101. a first tooth form; 110. a second section; 20. a connecting piece; 200. a first rounded protrusion; 201. a first tooth slot; 210. a second rounded convex body; 211. an annular groove; 212. an annular flange; 213. reinforcing ribs; 214. a first gate; 215. a first through groove; 216. a second through slot; 217. a third through slot; 218. a fourth slot; 219. a second tooth form; 220. a first connection portion; 230. a second connecting portion; 30. an outer member; 300. an annular clamping block; 301. a strip groove; 302. a first post; 303. a second post; 304. a third post; 305. a fourth post; 310. a third rounded protrusion; 311. a second tooth slot; 312. and a third tooth form.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
As shown in fig. 1 to 5, the gear provided by the embodiment of the invention comprises an intermediate shaft 10, a connecting piece 20 and an outer piece 30; the intermediate shaft 10 comprises a first section 100 and a second section 110 coaxially arranged with the first section 100, and the intermediate shaft 10 is a metal piece; the connecting piece 20 comprises a first circular convex body 200 and a second circular convex body 210, wherein the inner side surface of the second circular convex body 210 is wrapped on the outer circumferential surface of the first circular convex body 200, and the first circular convex body 200 is hollow; the outer member 30 includes an annular clamping block 300 and a third circular protrusion 310, wherein an inner side of the third circular protrusion 310 is wrapped on an outer circumferential surface of the annular clamping block 300, and a plurality of third tooth shapes 312 are uniformly distributed on the outer circumferential surface of the third circular protrusion 310 along a circumferential direction thereof.
The gear provided by the embodiment of the invention can be applied to an electric power steering system and an intelligent braking system.
Referring to fig. 2 and 3, a plurality of first tooth shapes 101 are uniformly distributed on the outer circumferential surface of the first section 100 of the intermediate shaft 10 along the circumferential direction thereof, and a plurality of first tooth grooves 201 which are in clamping fit with the corresponding first tooth shapes 101 are uniformly distributed on the inner side surface of the first circular convex body 200 along the circumferential direction thereof; the first tooth profile 101 is matched with the corresponding first tooth groove 201 in a clamping way, so that the contact area of the intermediate shaft 10 and the connecting piece 20 is increased, and the holding force between the intermediate shaft 10 and the connecting piece 20 is further increased, so that the gear can bear larger torsion, and the intermediate shaft 10 and the connecting piece 20 are not easy to break away from contact.
Referring to fig. 3 and 4, the second boss 210 is provided with an annular groove 211 engaged with the annular clamping block 300, so as to increase the contact area between the connecting member 20 and the outer member 30. The annular groove 211 is formed by recessing the outer circumferential surface of the second boss 210 toward the radial direction of the second boss 210, and the annular groove 211 divides the second boss 210 into a first connection part 220 and a second connection part 230.
The bottom of the annular groove 211 is provided with a plurality of raised strips, and the inner side surface of the annular clamping block 300 is provided with a plurality of strip grooves 301 which are matched with the corresponding raised strips in a clamping manner, so that the contact area between the connecting piece 20 and the outer piece 30 is increased.
The end surface of the first connecting portion 220 far away from the annular groove 211 is a first end surface, the end surface of the second connecting portion 230 far away from the annular groove 211 is a second end surface, annular flanges 212 are arranged on the first end surface and the second end surface, the distances from any point on the inner side surface of the annular flange 212 on the first end surface to the outer circumferential surface of the first circular protrusion 200 along the radial direction of any end surface of the second circular protrusion 210 are equal, and the distances from any point on the inner side surface of the annular flange 212 on the second end surface to the outer circumferential surface of the first circular protrusion 200 along the radial direction of any end surface of the second circular protrusion 210 are equal.
A plurality of reinforcing ribs 213 are fixedly arranged on the first end face and the second end face, and the reinforcing ribs 213 are uniformly distributed along the circumferential direction of the outer circumferential surface of the first circular convex body 200. The two ends of the reinforcing rib 213 of the first end face are respectively connected with the outer circumferential surface of the first circular convex body 200 and the inner side surface of the annular flange 212 of the first end face, and the two ends of the reinforcing rib 213 of the second end face are respectively connected with the outer circumferential surface of the first circular convex body 200 and the inner side surface of the annular flange 212 of the second end face.
The provision of the reinforcing ribs 213 increases the overall strength of the gear.
A first inlet 214 of the connector 20 is provided on a portion of the rib 213.
The first connecting part 220 and the second connecting part 230 are respectively provided with a plurality of first through grooves 215, the first through grooves 215 on the first connecting part 220 penetrate through two end surfaces of the first connecting part 220, the first through grooves 215 on the second connecting part 230 penetrate through two end surfaces of the second connecting part 230, and the first through grooves 215 on the first connecting part 220 and the first through grooves 215 on the second connecting part 230 are respectively and uniformly distributed along the circumferential direction of the outer circumferential surface of the first circular convex body 200; the two end surfaces of the annular clamping block 300 are respectively provided with a plurality of first convex columns 302 which are in clamping fit with the corresponding first through grooves 215.
The first connecting part 220 and the second connecting part 230 are respectively provided with a plurality of second through grooves 216, the second through grooves 216 on the first connecting part 220 penetrate through two end surfaces of the first connecting part 220, the second through grooves 216 on the second connecting part 230 penetrate through two end surfaces of the second connecting part 230, and the second through grooves 216 on the first connecting part 220 and the second through grooves 216 on the second connecting part 230 are respectively and uniformly distributed along the circumferential direction of the outer circumferential surface of the first circular convex body 200; the two end surfaces of the annular clamping block 300 are respectively provided with a plurality of second convex columns 303 which are in clamping fit with the corresponding second through grooves 216.
The shortest distance between the second through groove 216 and the inner side surface of the annular flange 212 is smaller than the shortest distance between any one of the first through grooves 215 and the inner side surface of the annular flange 212.
Referring to fig. 3, 4 and 5, the first connecting portion 220 and the second connecting portion 230 are respectively provided with a plurality of third through slots 217, the third through slots 217 are communicated with the corresponding second through slots 216, and the cross section area of the third through slots 217 is larger than the cross section area of the second through slots 216; and third convex columns 304 which are matched with the corresponding third tee grooves 217 in a clamping way are fixedly connected to the end surfaces of the second convex columns 303.
The third through slots 217 and the third protruding columns 304 in a clamping fit with the corresponding third through slots 217 are arranged, so that the notch of the second through slot 216 is not easy to expand, and the connection between the connecting piece 20 and the outer part 30 is tighter.
The first protruding columns 302 are matched with the corresponding first through grooves 215 in a clamping mode, the second protruding columns 303 are matched with the corresponding second through grooves 216 in a clamping mode, the third protruding columns 304 are matched with the corresponding third through grooves 217 in a clamping mode, the contact area between the connecting piece 20 and the outer piece 30 is increased, the holding force between the connecting piece 20 and the outer piece 30 is further increased, and therefore the gear can bear larger torsion force and is not easy to break away from contact between the connecting piece 20 and the outer piece 30.
The first connecting part 220 and the second connecting part 230 are respectively provided with a plurality of fourth grooves 218, the fourth grooves 218 on the first connecting part 220 penetrate through two end surfaces of the first connecting part 220, the fourth grooves 218 on the second connecting part 230 penetrate through two end surfaces of the second connecting part 230, and the fourth grooves 218 on the first connecting part 220 and the fourth grooves 218 on the second connecting part 230 are respectively and uniformly distributed along the circumferential direction of the outer circumferential surface of the first circular convex body 200; the two end surfaces of the annular clamping block 300 are respectively provided with a plurality of fourth convex columns 305 which are in clamping fit with the corresponding fourth grooves 218, and the fourth convex columns 305 are hollow.
The hollow fourth post 305 is the second inlet of the outer member 30.
A plurality of second tooth shapes 219 are uniformly distributed on the first connecting part 220 along the outer peripheral surface of the first connecting part 220 and the second connecting part 230 along the outer peripheral surface of the second connecting part 230, and a plurality of second tooth grooves 311 which are in clamping fit with the corresponding second tooth shapes 219 are arranged on the inner side surface of the third circular convex body 310; the contact area of the connector 20 and the outer member 30 is increased, thereby increasing the holding force between the connector 20 and the outer member 30.
Referring to fig. 6, the embodiment of the present invention further provides a gear manufacturing method, and the gear manufacturing method in the above embodiment is described below by way of example, and specifically as follows:
step S100, manufacturing the intermediate shaft 10.
Specifically, the intermediate shaft 10 includes a first section 100 and a second section 110; the cross-sectional area of the first segment 100 is larger than that of the second segment 110, and a plurality of first tooth shapes 101 are uniformly distributed on the outer peripheral surface of the first segment 100 along the circumferential direction. The second segment 110 includes a first light surface.
Step S120, placing the intermediate shaft 10 in a connector mold, and injection molding the connector 20.
Specifically, the connecting piece die is provided with a first through hole matched with the first section 100 of the intermediate shaft 10 and a first positioning blind hole matched with the second section 110 of the intermediate shaft 10, the first through hole is communicated with the first positioning blind hole, and the aperture of the first through hole is larger than that of the first positioning blind hole; the first section 100 is arranged in the first through hole, the second section 110 is arranged in the first positioning blind hole, and the first light surface of the second section 110 is abutted against the inner side surface of the first positioning blind hole; the connecting piece mould is provided with a plurality of first water gaps, the connecting piece mould is injected with the connecting piece mould in a tunnel glue-feeding mode through the plurality of first water gaps so as to form the connecting piece 20, the connecting piece 20 is coated on the peripheral surface of the first section 100 of the intermediate shaft 10, and an aggregate of the connecting piece 20 and the intermediate shaft 10 is formed. And, a plurality of first water inlets on the connecting piece mould correspond to a plurality of first water inlets 214 on the connecting piece 20 after injection molding respectively.
The first positioning blind hole can ensure concentricity of the intermediate shaft 10 and the connecting piece 20 after injection molding.
In step S120, the connecting member 20 is formed with a plurality of first tooth grooves 201 formed on the outer peripheral surface of the connecting member 20 along the circumferential direction thereof so as to be in snap fit with corresponding first tooth shapes 101 on the intermediate shaft 10, thereby increasing the holding force between the intermediate shaft 10 and the connecting member 20, so that the gear can bear a larger torsion force, and the intermediate shaft 10 and the connecting member 20 are not easy to be separated from contact.
Step S130, placing the aggregate in an outer part mold, and injection molding the outer part 30, wherein a plurality of third tooth shapes 312 are uniformly distributed on the outer peripheral surface of the injection molded outer part 30 along the circumferential direction; the outer part die is provided with a second through hole matched with the connecting piece 20 and a second positioning blind hole matched with the second section 110 of the intermediate shaft 10, the second through hole is communicated with the second positioning blind hole, and the aperture of the second through hole is larger than that of the second positioning blind hole; the connecting piece 20 and the first section 100 of the intermediate shaft 10 are arranged in the second through hole, and the outer peripheral surface of the connecting piece 20 is abutted against the inner side surface of the second through hole; the second section 110 of the intermediate shaft 10 is arranged in the second positioning blind hole, and the first light surface is abutted against the inner side surface of the second positioning blind hole; the outer part mold is provided with a plurality of second water-reducing ports, and the outer part 30 is molded and coated on the outer peripheral surface of the connecting piece 20 by injection molding of the outer part mold through the plurality of second water-reducing ports. And a plurality of second water-thin openings on the outer part mould are respectively corresponding to fourth convex columns 305 which are arranged in the hollow of the outer part 30 after injection molding.
The provision of the second blind positioning hole can ensure concentricity of the aggregate and the injection molded outer member 30.
The injection molded connecting piece 20 includes a first boss 200, a second boss 210, and an annular groove 211 formed on the second boss 210, where an inner side of the second boss 210 is wrapped on an outer peripheral surface of the first boss 200. The injection molded connector 20 includes an annular clamping block 300 and a third boss 310, which are engaged with the annular groove 211, and an inner side of the third boss 310 is wrapped on an outer peripheral surface of the annular clamping block 300.
A plurality of protruding bars are formed at the bottom of the annular groove 211 of the connecting piece 20, and a plurality of bar grooves 301 engaged with the corresponding protruding bars are formed at the inner side of the annular clamping block 300 of the outer piece 30, so as to increase the contact area between the connecting piece 20 and the outer piece 30, and further increase the holding force between the connecting piece 20 and the outer piece 30.
A plurality of reinforcing ribs 213 are formed at both ends of the second dome 210 of the coupling member 20 to increase the overall strength of the gear.
Forming a plurality of first through grooves 215, second through grooves 216 and third through grooves 217 on the connection member 20, wherein the second through grooves 216 are communicated with the third through grooves 217, and the cross-sectional area of the third through grooves 217 is that of the second through grooves 216; the annular clamping block 300 of the outer part 30 is provided with a plurality of first convex columns 302 which are in clamping fit with the corresponding first through grooves 215, a plurality of second convex columns 303 which are in clamping fit with the corresponding second through grooves 216 and a plurality of third convex columns 304 which are in clamping fit with the corresponding third through grooves 217 at two end surfaces of the annular clamping block, and the third convex columns 304 are formed on the end surfaces of the corresponding second convex columns 303, so that the contact area between the connecting part 20 and the outer part 30 is increased, and the holding force between the connecting part 20 and the outer part 30 is further increased.
A plurality of fourth grooves 218 are formed on the connecting member 20, a plurality of fourth posts 305 engaged with the corresponding fourth grooves 218 are formed on both ends of the annular clamping block 300 of the outer member 30, and the fourth posts 305 are hollow.
A plurality of second tooth shapes 219 are formed on the outer circumferential surface of the connecting member 20 and uniformly distributed along the circumferential direction, and a plurality of second tooth grooves 311 are formed on the inner side surface of the third boss 310 of the outer member 30 and are engaged with the corresponding second tooth shapes 219 in a clamping manner, so as to increase the contact area between the connecting member 20 and the outer member 30, and further increase the holding force between the connecting member 20 and the outer member 30.
The beneficial effects achieved by the embodiment of the invention are as follows:
(1) Compared with the manufacturing method of the gear with the sprue part removed by machining in the final injection molding process of the outer part 30 in the prior art, the manufacturing method of the gear reduces the processing procedures, improves the production efficiency and reduces the production cost;
(2) Compared with the gear manufacturing method for processing the outer part 30 in the prior art, the gear manufacturing method provided by the embodiment of the invention reduces the influence of the post-processing process on the outer part 30 by placing the outer part 30 with the highest functional requirement in the gear in the last procedure for processing, and effectively improves the qualification rate of the finished product;
(3) The connecting piece 20 is made of plastic, so that heat conduction between the injection molded outer piece 30 and the metal piece intermediate shaft 10 can be well blocked, and the outer piece 30 can be prevented from being influenced by size change caused by uneven plastic cooling in the injection molding process, so that the quality of products is prevented.
Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method of manufacturing a gear, wherein the gear comprises:
an intermediate shaft;
the connecting piece comprises a first round convex body and a second round convex body; the first circular convex body is hollow, the inner side surface of the second circular convex body is wrapped on the outer peripheral surface of the first circular convex body, and the outer peripheral surface of the first section of the intermediate shaft is abutted against the inner side surface of the first circular convex body; the second round convex body is provided with an annular groove;
the outer part, the outer part includes annular fixture block and third circular convex body, annular fixture block with annular groove joint cooperation, just the outer peripheral face of annular fixture block and the medial surface fixed connection of third circular convex body, the outer peripheral face of third circular convex body is the cockscomb structure, wherein the gear manufacturing method includes:
manufacturing an intermediate shaft, wherein the intermediate shaft comprises a first section and a second section coaxially arranged with the first section;
placing the intermediate shaft in a connecting piece die, and injection molding a connecting piece, wherein a first through hole matched with a first section of the intermediate shaft and a first positioning blind hole matched with a second section of the intermediate shaft are formed in the connecting piece die, and the first through hole is communicated with the first positioning blind hole; the first section is arranged in the first through hole, and the second section is arranged in the first positioning blind hole; the connecting piece die is provided with a plurality of first water-thinning ports, the connecting piece die is subjected to injection molding through the first water-thinning ports so as to form the connecting piece, and the connecting piece is coated on the outer peripheral surface of the first section of the intermediate shaft and forms an aggregate of the connecting piece and the intermediate shaft;
placing the assembly in an outer part mould, and performing injection molding on an outer part, wherein the outer peripheral surface of the injection molded outer part is in a zigzag shape; the outer part die is provided with a second through hole matched with the connecting piece and a second positioning blind hole matched with the second section of the intermediate shaft, and the second through hole is communicated with the second positioning blind hole; the connecting piece in the assembly and the first section of the intermediate shaft are arranged in the second through hole, and the second section of the intermediate shaft is arranged in the second positioning blind hole; the outer part mold is provided with a plurality of second water-thinning ports, and the outer part mold is subjected to injection molding through the second water-thinning ports so as to form the outer part and cover the outer peripheral surface of the connecting piece.
2. The method according to claim 1, wherein the outer peripheral surface of the first section of the intermediate shaft is connected with the inner side surface of the first boss through a plurality of first tooth shapes and a plurality of first tooth grooves which are engaged with the corresponding first tooth shapes in a clamping manner, so as to increase the contact area between the intermediate shaft and the connecting piece.
3. The method of manufacturing gears according to claim 1, wherein the annular groove is connected with the annular clamping block through a plurality of convex strips and a plurality of grooves which are in clamping fit with the corresponding convex strips, so as to increase the contact area between the connecting piece and the outer part.
4. The gear manufacturing method according to claim 1, wherein annular flanges are provided on both end surfaces of the second dome body, and any point of an inner side surface of the annular flanges is equidistant from an outer peripheral surface of the first dome body along a radial direction of both end surfaces of the second dome body;
the two end faces of the second circular convex body are fixedly provided with a plurality of reinforcing ribs, the reinforcing ribs are uniformly distributed along the circumferential direction of the outer circumferential surface of the first circular convex body, and the reinforcing ribs are respectively connected with the outer circumferential surface of the first circular convex body and the inner side face of the annular flange.
5. The gear manufacturing method according to claim 1, wherein the annular groove is formed by recessing an outer peripheral surface of the second dome toward a radial direction of the second dome, the annular groove dividing the second dome into a first connecting portion and a second connecting portion;
a plurality of first through grooves are formed in the first connecting part and the second connecting part, the first through grooves penetrate through two end faces of the first connecting part and two end faces of the second connecting part respectively, and the first through grooves in the first connecting part and the first through grooves in the second connecting part are uniformly distributed along the circumferential direction of the outer circumferential surface of the first circular convex body respectively; the two end surfaces of the annular clamping block are respectively provided with a plurality of first convex columns which are matched with the corresponding first through grooves in a clamping way.
6. The method according to claim 5, wherein the first connecting portion and the second connecting portion are each provided with a plurality of second through grooves, the plurality of second through grooves penetrate through two end surfaces of the first connecting portion and two end surfaces of the second connecting portion respectively, and the plurality of second through grooves on the first connecting portion and the plurality of second through grooves on the second connecting portion are distributed uniformly along the circumferential direction of the outer circumferential surface of the first circular protrusion respectively; a plurality of second convex columns which are in clamping fit with the corresponding second through grooves are arranged on two end faces of the annular clamping block;
the shortest distance between the second through groove and the inner side surface of the annular flange is smaller than the shortest distance between any one of the first through grooves and the inner side surface of the annular flange.
7. The gear manufacturing method according to claim 6, wherein a plurality of third through grooves are provided on each of the first connecting portion and the second connecting portion, the third through grooves communicate with the corresponding second through grooves, and the area of the cross section of the third through grooves is larger than the area of the cross section of the second through grooves; and a plurality of third convex columns which are matched with the corresponding third through grooves in a clamping way are fixedly connected to the end surfaces of the second convex columns.
8. The method according to claim 5, wherein a plurality of fourth grooves are formed in each of the first and second connection portions, the plurality of fourth grooves penetrate through both end surfaces of the first connection portion and both end surfaces of the second connection portion, respectively, and the plurality of fourth grooves in the first connection portion and the plurality of fourth grooves in the second connection portion are uniformly distributed along a circumferential direction of an outer circumferential surface of the first dome; the two end faces of the annular clamping block are respectively provided with a plurality of fourth convex columns which are matched with the corresponding fourth grooves in a clamping manner, and the fourth convex columns are hollow.
9. The method according to claim 1, wherein the outer peripheral surface of the second boss is connected to the inner side surface of the third boss through a plurality of second tooth shapes and a plurality of second tooth grooves engaged with the corresponding second tooth shapes, so as to increase the contact area between the connecting piece and the outer member.
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| CN201910072709.5A CN109695697B (en) | 2019-01-25 | 2019-01-25 | Gear and gear manufacturing method |
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| CN201910072709.5A CN109695697B (en) | 2019-01-25 | 2019-01-25 | Gear and gear manufacturing method |
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| CN109695697B true CN109695697B (en) | 2023-09-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102670455B1 (en) * | 2019-09-03 | 2024-05-29 | 에이치엘만도 주식회사 | Worm Wheel of Reducer for Steering Apparatus and Manufacturing Method of The Same |
| CN110682960B (en) * | 2019-09-09 | 2020-07-14 | 安徽中鼎橡塑制品有限公司 | Worm wheel for automobile steering gear and manufacturing method thereof |
| DE102019130185A1 (en) * | 2019-11-08 | 2021-05-12 | Volkswagen Aktiengesellschaft | Spur gear |
| CN117359883B (en) * | 2023-12-05 | 2024-03-12 | 天津汇友连众精密模具股份有限公司 | Gear shaft injection mold |
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