CN109737197B - Gear and gear manufacturing method - Google Patents
Gear and gear manufacturing method Download PDFInfo
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- CN109737197B CN109737197B CN201910138257.6A CN201910138257A CN109737197B CN 109737197 B CN109737197 B CN 109737197B CN 201910138257 A CN201910138257 A CN 201910138257A CN 109737197 B CN109737197 B CN 109737197B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 230000002093 peripheral effect Effects 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 20
- 238000001746 injection moulding Methods 0.000 claims description 18
- 210000003781 tooth socket Anatomy 0.000 claims 2
- 238000012545 processing Methods 0.000 abstract description 8
- 238000003754 machining Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The embodiment of the invention discloses a gear, which comprises an intermediate shaft, a connecting piece and an outer part, wherein the intermediate shaft comprises a first section; the connecting piece comprises a first hollow ring and a second hollow ring, the inner side surface of the second hollow ring is wrapped on the outer circumferential surface of the first hollow ring, and the outer circumferential surface of the first section is propped against the inner side surface of the first hollow ring; the second hollow ring is provided with an annular groove, the outer part comprises a third hollow ring and an annular clamping block matched with the annular groove in a clamping way, the outer peripheral surface of the annular clamping block is connected with the inner side surface of the third hollow ring, and the outer peripheral surface of the third hollow ring is in a zigzag shape. The embodiment of the invention also discloses a gear manufacturing method, which comprises the following steps: manufacturing an intermediate shaft; the intermediate shaft is placed in the outer part mold and the outer part is injection molded, and the outer part and the intermediate shaft are placed in the connector mold and the connector is injection molded. Compared with 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 (structure) 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: firstly, injecting an outer part through a die; secondly, removing a pouring gate in the middle of the gear produced by injection molding through machining; thirdly, placing the gear shape and the middle metal bushing on a second set of die, and producing the connecting part by injection molding to complete the gear. Fourth, assembling the intermediate shaft through a press after gear production.
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 hollow circular ring and a second hollow circular ring; the inner side surface of the second hollow circular ring is wrapped on the outer circumferential surface of the first hollow circular ring, and the outer circumferential surface of the first section of the intermediate shaft abuts against the inner side surface of the first hollow circular ring; the second hollow ring is provided with an annular groove, and the outer side surface of the second hollow ring is provided with convex teeth;
the outer part comprises an annular clamping block and a third hollow ring, the outer peripheral surface of the annular clamping block is fixedly connected with the inner side surface of the third hollow ring, the annular clamping block is matched with the annular groove in a clamping mode, a convex tooth groove matched with the convex tooth in a clamping mode is arranged on the inner side surface of the third hollow ring, the convex tooth of the outer side surface of the second hollow ring is matched with the convex tooth groove in a clamping mode, and a tooth-shaped structure is arranged on the outer side surface of the third hollow ring.
As a preferable technical scheme of the embodiment of the invention, the outer circumferential surface of the first section of the intermediate shaft is provided with shaft teeth, the inner side surface of the first hollow ring is provided with shaft tooth grooves which are correspondingly clamped and matched with the shaft teeth, and the outer circumferential surface of the first section of the intermediate shaft is connected with the inner side surface of the first hollow ring through the shaft teeth and the shaft tooth grooves so as to increase the contact area between the intermediate shaft and the connecting piece.
As a preferable technical scheme of the embodiment of the invention, a plurality of expansion preventing holes are formed in the annular clamping block along the circumferential direction.
As a preferred technical scheme of the embodiment of the invention, the two end faces of the second hollow ring are fixedly provided with a plurality of reinforcing ribs, wherein each reinforcing rib of part of the reinforcing ribs is arranged between the first hollow ring and the second hollow ring in the radial direction of the second hollow ring, and the other reinforcing rib of the reinforcing ribs is arranged on the inner side face of the second hollow ring in the perpendicular direction with the radial direction of the second hollow ring.
As a preferable technical scheme of the embodiment of the invention, the annular groove is formed by recessing the outer peripheral surface of the second hollow circular ring towards the radial direction of the second hollow circular ring, and the annular groove divides the second hollow circular ring into a first connecting part and a second connecting part;
the first connecting part and the second connecting part are respectively provided with a plurality of through grooves, the through grooves respectively penetrate through two end surfaces of the first connecting part and two end surfaces of the second connecting part, and the through grooves on the first connecting part and the through grooves on the second connecting part are respectively and uniformly distributed along the circumferential direction of the outer circumferential surface of the first hollow circular ring; and a plurality of convex columns matched with the through grooves in a clamping way are arranged on two end faces of the annular clamping block.
As a preferred technical scheme of the embodiment of the invention, the first connecting part and the second connecting part are respectively provided with a plurality of limiting grooves, the limiting grooves respectively penetrate through two end surfaces of the first connecting part and two end surfaces of the second connecting part, and the limiting grooves on the first connecting part and the limiting grooves on the second connecting part are respectively and uniformly distributed along the circumferential direction of the outer circumferential surface of the first hollow circular ring; a plurality of limiting blocks which are matched with the limiting grooves in a clamping way are arranged on two end faces of the annular clamping block; the limiting blocks are clamped and matched with the limiting grooves, so that the outer part and the connecting part are prevented from moving relatively.
As a preferable technical scheme of the embodiment of the invention, the shortest distance between the limiting groove and the inner side surface of the second hollow circular ring is smaller than the shortest distance between any through groove and the inner side surface of the second hollow circular ring.
As a preferable technical scheme of the embodiment of the invention, the shortest distance between the expansion preventing hole and the inner side surface of the second hollow circular ring is smaller than the shortest distance between any limiting block and the inner side surface of the second hollow circular ring.
As a preferable technical scheme of the embodiment of the invention, the limiting block is in a strip shape.
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;
injection molding of the outer part and the connecting piece is completed through the outer part mold and the connecting mold;
placing the intermediate shaft in an outer part mold, and injection molding an outer part, 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 outer part mold, 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 outer part mold is provided with a plurality of first pouring gates, the outer part mold is subjected to injection molding through the plurality of first pouring gates so as to form the outer part, and the outer peripheral surface of the injection molded outer part is tooth-shaped;
placing the outer part and the intermediate shaft in a connecting piece mould, and injection molding a connecting piece, wherein the connecting piece is coated on the outer peripheral surface of a first section of the intermediate shaft and two end surfaces of an annular clamping block of the outer part, a second through hole matched with the outer part and a second positioning blind hole matched with a second section of the intermediate shaft are arranged on the connecting mould, and the second through hole is communicated with the second blind hole; the outer part 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 connecting piece die is provided with a plurality of second pouring gates, and the connecting piece die is subjected to injection molding through the second pouring gates so that the connecting piece is molded and coated on the outer peripheral surface of the connecting piece and the two end faces of the annular clamping block of the outer part.
The beneficial effects achieved by the embodiment of the invention are as follows: in the final injection molding process of the outer part, the gate inlet part does not need to be removed through mechanical processing, so that the processing procedures are reduced, the production efficiency is improved, and the production cost is reduced; and the mould is internally tangent with the pouring gate through the mould structure, so that the influence on the external part in the post-processing process is reduced, and the qualification rate of the 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 schematic top view of a gear according to an embodiment of the present invention;
fig. 7 is a flowchart of steps in a method of manufacturing a gear according to an embodiment of the present invention.
Reference numerals: 10-jackshaft, 100-first section, 101-axle tooth, 110-second section, 20-connecting piece, 200-first cavity ring, 201-axle tooth's socket, 210-second cavity ring, 211-annular groove, 212-dogtooth, 213-first strengthening rib, 214-second strengthening rib, 215-logical groove, 216-spacing groove, 220-first connecting portion, 230-second connecting portion, 30-external part, 300-annular fixture block, 301-expansion preventing hole, 302-projection, 303-stopper, 310-third cavity ring, 311 tooth profile, 312-dogtooth.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 6, 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 includes a first section 100 and a second section 110 coaxially disposed with the first section 100, and the intermediate shaft 10 may be a metal member.
The connector 20 includes a first hollow ring 200 and a second hollow ring 210, and an inner side of the second hollow ring 210 is wrapped around an outer circumferential surface of the first hollow ring 200.
The outer part 30 comprises an annular clamping block 300 and a third hollow circular ring 310, wherein the inner side surface of the third hollow circular ring 310 is wrapped on the outer peripheral surface of the annular clamping block 300, and tooth-shaped structures 311 are uniformly distributed on the outer peripheral surface of the third hollow circular ring 310 along the circumferential direction of the outer peripheral surface.
Referring to fig. 2 and 3, an outer circumferential surface of the first section 100 of the intermediate shaft 10 is provided with shaft teeth 101, an inner side surface of the first hollow ring 200 is provided with shaft tooth grooves 201 corresponding to and engaged with the shaft teeth 101, and the outer circumferential surface of the first section 100 of the intermediate shaft 10 is connected with the inner side surface of the first hollow ring 200 through the shaft teeth 101 and the shaft tooth grooves 201, so as to increase a contact area between the intermediate shaft 10 and the connecting piece 20; and further increases the holding force between the intermediate shaft 10 and the connecting piece 20, 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 hollow ring 210 is provided with an annular groove 211 engaged with the annular clamping block 300 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 hollow ring 210 toward the radial direction of the second hollow ring 210, and the annular groove 211 divides the second hollow ring 210 into a first connection part 220 and a second connection part 230;
the end face of the first connecting portion 220, which is far away from the annular groove 211, is a first end face, the end face of the second connecting portion 230, which is far away from the annular groove 211, is a second end face, both the first end face and the second end face are fixedly provided with first reinforcing ribs 213 and second reinforcing ribs 214, the first reinforcing ribs 213 are arranged between the first hollow circular ring 200 and the second hollow circular ring 210 in the radial direction of the second hollow circular ring 210, two end faces of the second hollow circular ring 210 are also provided with a plurality of second reinforcing ribs 214, and the second reinforcing ribs 214 are arranged on the inner side face of the second hollow circular ring 210 in the vertical direction of the radial direction of the second hollow circular ring 210.
The arrangement of the first reinforcing ribs 213 and the second reinforcing ribs 214 increases the overall strength of the gear.
A plurality of through grooves 215 are respectively arranged on the first connecting part 220 and the second connecting part 230, the plurality of through grooves 215 respectively penetrate through two end surfaces of the first connecting part 220 and two end surfaces of the second connecting part 230, and the plurality of through grooves 215 on the first connecting part 220 and the plurality of 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 hollow circular ring 200; both end surfaces of the annular clamping block 300 are provided with a plurality of protruding columns 302 which are in clamping fit with the through grooves 215.
A plurality of limiting grooves 216 are respectively arranged on the first connecting portion 220 and the second connecting portion 230, the plurality of limiting grooves 216 respectively penetrate through two end surfaces of the first connecting portion 220 and two end surfaces of the second connecting portion 230, and the plurality of limiting grooves 216 on the first connecting portion 220 and the plurality of limiting grooves 216 on the second connecting portion 230 are respectively and uniformly distributed along the circumferential direction of the outer circumferential surface of the first hollow circular ring 200; a plurality of limiting blocks 303 which are in clamping fit with the limiting grooves 216 are arranged on two end faces of the annular clamping block 300; the plurality of limiting blocks 303 are engaged with the plurality of limiting grooves 216, so as to prevent the outer member 30 from moving relative to the connecting member 20. The stopper 303 is in a strip shape.
The shortest distance between the limiting groove 216 and the inner side surface of the second hollow ring 210 is smaller than the shortest distance between any one of the through grooves 215 and the inner side surface of the second hollow ring 210.
A plurality of expansion preventing holes 301 are formed in the annular clamping block 300 along the circumferential direction; the shortest distance between the expansion preventing hole 301 and the inner side surface of the second hollow ring 210 is smaller than the shortest distance between any one of the limiting blocks 303 and the inner side surface of the second hollow ring 210.
Referring to fig. 7, 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, 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.
Step 200, placing the intermediate shaft 10 in an outer part mold, and injection molding an outer part 30, wherein a first through hole matched with a first section 100 of the intermediate shaft 10 and a first positioning blind hole matched with a second section 110 of the intermediate shaft 10 are formed in the outer part mold, and the first through hole is communicated with the first positioning blind hole; the first section 100 is placed in the first through hole, and the second section 110 is placed in the first positioning blind hole; the outer part mold is provided with a plurality of first pouring gates, the outer part mold is subjected to injection molding through the plurality of first pouring gates to form the outer part 30, and the outer peripheral surface of the injection molded outer part 30 is tooth-shaped;
the first positioning blind hole can ensure concentricity of the intermediate shaft 10 and the injection molded outer part 20.
Placing the outer part 30 and the intermediate shaft 10 in a connecting piece mold, and injection molding a connecting piece 20, wherein the connecting piece 20 is coated on the outer peripheral surface of a first section 100 of the intermediate shaft 10 and on two end surfaces of an annular clamping block 300 of the outer part 30, the connecting mold is provided with a second through hole matched with the outer part 30 and a second positioning blind hole matched with a second section 110 of the intermediate shaft 10, and the second through hole is communicated with the second blind hole; the outer part 30 and the first section 100 of the intermediate shaft 10 are placed in the second through hole, and the second section 110 of the intermediate shaft 10 is placed in the second blind positioning hole; the connecting piece mold is provided with a plurality of second pouring gates, and the connecting piece mold is injection molded through the second pouring gates so that the connecting piece 20 is molded and coated on the outer peripheral surface of the connecting piece 20 and the two end surfaces of the annular clamping block 300 of the outer piece 30.
The provision of the second blind positioning hole can ensure concentricity of the aggregate and the injection molded outer member 30.
In step S300, the connecting member 20 is formed to have a shaft groove 201 formed on the outer circumferential surface of the connecting member 20 along the circumferential direction thereof so as to be in snap fit with the corresponding shaft tooth 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 easily separated from contact.
The connector 20 includes a first hollow ring 200 and a second hollow ring 210; the inner side surface of the second hollow ring 210 is wrapped on the outer circumferential surface of the first hollow ring 200, and the outer circumferential surface of the first section 100 of the intermediate shaft 10 abuts against the inner side surface of the first hollow ring 200; an annular groove 211 is formed in the second hollow circular ring 210, and convex teeth 212 are formed on the outer side surface of the second hollow circular ring 210;
the outer member 30 includes an annular clamping block 300 and a third hollow ring 310, the outer circumferential surface of the annular clamping block 300 is fixedly connected with the inner side surface of the third hollow ring 310, the annular clamping block 300 is in clamping fit with the annular groove 211, the inner side surface of the third hollow ring 310 is provided with a convex tooth groove 312 corresponding to the convex tooth 212 in clamping fit, the convex tooth 212 on the outer side surface of the second hollow ring 210 is in clamping fit with the convex tooth groove 312, and the outer side surface of the third hollow ring 310 is provided with a tooth 311 structure. The outer peripheral surface of the first section 100 of the intermediate shaft 10 is provided with shaft teeth 101, the inner side surface of the first hollow ring 200 is provided with shaft tooth grooves 201 corresponding to the shaft teeth 101 in a clamping fit, and the outer peripheral surface of the first section 100 of the intermediate shaft 10 and the inner side surface of the first hollow ring 200 are connected with the shaft tooth grooves 201 through the shaft teeth 101 so as to increase the contact area between the intermediate shaft 10 and the connecting piece 20.
The annular clamping block 300 is provided with a plurality of expansion preventing holes 301 along the circumferential direction.
The two end surfaces of the second hollow ring 210 are fixedly provided with a plurality of first reinforcing ribs 213, wherein the first reinforcing ribs 213 are arranged between the first hollow ring 200 and the second hollow ring 210 in the radial direction of the second hollow ring 210, the two end surfaces of the second hollow ring 210 are also provided with a plurality of second reinforcing ribs 214, and the second reinforcing ribs 214 are arranged on the inner side surface of the second hollow ring 210 in the vertical direction of the radial direction of the second hollow ring 210.
The annular groove 211 is formed by recessing the outer circumferential surface of the second hollow ring 210 toward the radial direction of the second hollow ring 210, and the annular groove 211 divides the second hollow ring 210 into a first connection part 220 and a second connection part 230;
the first connecting portion 220 and the second connecting portion 230 are each provided with a plurality of through grooves 215, the plurality of through grooves 215 respectively penetrate through two end surfaces of the first connecting portion 220 and two end surfaces of the second connecting portion 230, and the plurality of through grooves 215 on the first connecting portion 220 and the plurality of through grooves 215 on the second connecting portion 230 are respectively and uniformly distributed along the circumferential direction of the outer circumferential surface of the first hollow ring 200; both end surfaces of the annular clamping block 300 are provided with a plurality of protruding columns 302 which are in clamping fit with the through grooves 215. A plurality of limiting grooves 216 are respectively arranged on the first connecting part 220 and the second connecting part 230, the limiting grooves 216 respectively penetrate through two end surfaces of the first connecting part 220 and two end surfaces of the second connecting part 230, and the limiting grooves 216 on the first connecting part 220 and the limiting 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 hollow circular ring 200; a plurality of limiting blocks 303 which are in clamping fit with the limiting grooves 216 are arranged on two end faces of the annular clamping block 300; the plurality of limiting blocks 303 are engaged with the plurality of limiting grooves 216, so as to prevent the outer member 30 from moving relative to the connecting member 20. The stopper 303 is in a long strip shape.
The shortest distance between the limiting groove 216 and the inner side of the second hollow ring 210 is smaller than the shortest distance between any one of the through grooves 215 and the inner side of the second hollow ring 210.
The shortest distance between the expansion preventing hole 301 and the inner side of the second hollow ring 210 is smaller than the shortest distance between any one of the limiting blocks 303 and the inner side of the second hollow ring 210.
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 has the advantages that the pouring gate is internally cut in the die through the die structure, the influence on the outer part 30 in the post-processing process is reduced, and the qualification rate of the finished product is effectively improved;
(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: while the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method of manufacturing a gear, the gear comprising:
an intermediate shaft;
the connecting piece comprises a first hollow circular ring and a second hollow circular ring; the inner side surface of the second hollow circular ring is wrapped on the outer circumferential surface of the first hollow circular ring, and the outer circumferential surface of the first section of the intermediate shaft abuts against the inner side surface of the first hollow circular ring; the second hollow ring is provided with an annular groove, and the outer side surface of the second hollow ring is provided with convex teeth;
the outer part, the outer part includes annular fixture block and third cavity ring, the outer peripheral face of annular fixture block and the medial surface fixed connection of third cavity ring, just annular fixture block with annular groove joint cooperation, the medial surface of third cavity ring be equipped with protruding tooth socket of the corresponding joint complex of tooth, the tooth of second cavity ring lateral surface with protruding tooth socket joint cooperation, the lateral surface of third cavity ring is equipped with tooth profile 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;
injection molding of the outer part and the connecting piece is completed through the outer part mold and the connecting mold;
placing the intermediate shaft in an outer part mold, and injection molding an outer part, 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 outer part mold, 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 outer part mold is provided with a plurality of first pouring gates, the outer part mold is subjected to injection molding through the plurality of first pouring gates so as to form the outer part, and the outer peripheral surface of the injection molded outer part is tooth-shaped;
placing the outer part and the intermediate shaft in a connecting piece mould, and injection molding a connecting piece, wherein the connecting piece is coated on the outer peripheral surface of a first section of the intermediate shaft and two end surfaces of an annular clamping block of the outer part, a second through hole matched with the outer part and a second positioning blind hole matched with a second section of the intermediate shaft are arranged on the connecting mould, and the second through hole is communicated with the second positioning blind hole; the outer part 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 connecting piece die is provided with a plurality of second pouring gates, and the connecting piece die is subjected to injection molding through the second pouring gates so that the connecting piece is molded and coated on the outer peripheral surface of the connecting piece and the two end faces of the annular clamping block of the outer part.
2. The method according to claim 1, wherein the outer peripheral surface of the first section of the intermediate shaft is provided with shaft teeth, the inner side surface of the first hollow ring is provided with shaft tooth grooves corresponding to the shaft teeth in a clamping fit, and the outer peripheral surface of the first section of the intermediate shaft and the inner side surface of the first hollow ring are connected with the shaft tooth grooves through the shaft teeth so as to increase the contact area between the intermediate shaft and the connecting piece.
3. The method of manufacturing a gear according to claim 2, wherein the annular block is provided with a plurality of expansion preventing holes in a circumferential direction.
4. The gear manufacturing method according to claim 3, wherein a plurality of first reinforcing ribs are fixedly arranged on both end surfaces of the second hollow ring, the first reinforcing ribs are arranged between the first hollow ring and the second hollow ring in a radial direction of the second hollow ring, a plurality of second reinforcing ribs are further arranged on both end surfaces of the second hollow ring, and the second reinforcing ribs are arranged on an inner side surface of the second hollow ring in a direction perpendicular to the radial direction of the second hollow ring.
5. The gear manufacturing method according to claim 4, wherein the annular groove is formed by recessing an outer peripheral surface of the second hollow ring toward a radial direction of the second hollow ring, the annular groove dividing the second hollow ring into a first connecting portion and a second connecting portion;
the first connecting part and the second connecting part are respectively provided with a plurality of through grooves, the through grooves respectively penetrate through two end surfaces of the first connecting part and two end surfaces of the second connecting part, and the through grooves on the first connecting part and the through grooves on the second connecting part are respectively and uniformly distributed along the circumferential direction of the outer circumferential surface of the first hollow circular ring; and a plurality of convex columns matched with the through grooves in a clamping way are arranged on two end faces of the annular clamping block.
6. The method according to claim 5, wherein a plurality of limiting grooves are formed in each of the first connecting portion and the second connecting portion, the plurality of limiting grooves penetrate through both end surfaces of the first connecting portion and both end surfaces of the second connecting portion, and the plurality of limiting grooves in the first connecting portion and the plurality of limiting grooves in the second connecting portion are uniformly distributed along a circumferential direction of an outer circumferential surface of the first hollow ring; a plurality of limiting blocks which are matched with the limiting grooves in a clamping way are arranged on two end faces of the annular clamping block; the limiting blocks are clamped and matched with the limiting grooves, so that the outer part and the connecting part are prevented from moving relatively.
7. The method of manufacturing gears according to claim 6, wherein the shortest distance of the limiting groove from the inner side of the second hollow ring is smaller than the shortest distance of any through groove from the inner side of the second hollow ring.
8. The method of manufacturing gears according to claim 7, wherein the shortest distance of said expansion preventing hole from said second hollow ring inner side is smaller than the shortest distance of any one of said stoppers from said second hollow ring inner side.
9. The method of manufacturing a gear according to claim 6, wherein the stopper has a long strip shape.
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| CN201910138257.6A CN109737197B (en) | 2019-02-25 | 2019-02-25 | Gear and gear manufacturing method |
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| CN201910138257.6A CN109737197B (en) | 2019-02-25 | 2019-02-25 | Gear and gear manufacturing method |
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| CN109737197B true CN109737197B (en) | 2023-11-03 |
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| CN111619653A (en) * | 2019-09-09 | 2020-09-04 | 安徽中鼎橡塑制品有限公司 | Worm wheel for automobile steering gear and manufacturing method thereof |
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| CN209671559U (en) * | 2019-02-25 | 2019-11-22 | 上海创率复合材料有限公司 | Gear |
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| KR101627311B1 (en) * | 2015-01-12 | 2016-06-13 | 주식회사 만도 | Worm wheel of reduction gear for use in an electric power steering |
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| DE102004064001B4 (en) * | 2004-01-19 | 2012-03-15 | Ims Gear Gmbh | Gear arrangement for auxiliary gear transmission of vehicle, comprising flange with several reinforcing bridges |
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| CN109737197A (en) | 2019-05-10 |
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