CN100564951C - Net formed gear member and manufacture method - Google Patents
Net formed gear member and manufacture method Download PDFInfo
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- CN100564951C CN100564951C CNB2007100841774A CN200710084177A CN100564951C CN 100564951 C CN100564951 C CN 100564951C CN B2007100841774 A CNB2007100841774 A CN B2007100841774A CN 200710084177 A CN200710084177 A CN 200710084177A CN 100564951 C CN100564951 C CN 100564951C
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- stretch out
- gear
- roughly
- radially outwards
- blank
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Abstract
But provide a kind of gear member of self-shifting automotive trannsmission system.This gear member has a gear mass, and this gear mass has the columniform outer surface that is essentially that forms wheel tooth that a plurality of radially outwards stretch out.Internal surface is essentially the coaxial setting of columniform outer surface with this basically, and extends at least a portion of this gear mass.In addition, at least a portion of this internal surface, form a plurality of splines that radially inwardly stretch out.The wheel tooth spare that these a plurality of radially outwards stretch out and at least one of these a plurality of splines that radially inwardly stretch out are cold hobbing.The method that forms this gear member also is provided.This method comprises that utilizing oppositely one of extruding to be essentially columniform metal bar forms a blank that is essentially pipe shape.Then, utilize cold hobbing, on this is essentially at least a portion of blank of tubulose, form a plurality of wheel teeth, to form this gear member.
Description
The mutual reference of related application
The U.S. Provisional Patent Application that the application's request was submitted on February 17th, 2006 enjoys priority for No. 60/774574.
Technical field
But the present invention relates to net formed (net formed) the input sun gear spare and the manufacture method thereof of self-shifting automotive trannsmission system.
The background of invention
Usually by utilizing the meshed gears tooth, be well-known from the gear member that a turning axle is passed to another with moment of torsion.Technical known a plurality of interconnected gear members are as a gear train.Usually planetary gear set comprises a sun gear spare, and a plurality of planets or small gear are by gear member and internal tooth annulus spare of a supporting members support.
Usually, but the self-shifting automotive trannsmission system comprises at least one planetary gear set.In this planetary gear set, this sun gear spare is connected with driving or input shaft and is rotated by this axle usually.Excircle of this sun gear spare or surface comprise a plurality of wheel teeth that form thereon.Each sun gear tooth comprises matching surface, the corresponding matching surface engagement on the corresponding wheel tooth of they and a plurality of pinion member.The wheel tooth of this pinion member also with the internal surface of this internal gear annulus spare on the wheel tooth engagement.
In the process that this planetary gear set is worked in transmission device, this sun gear spare and this pinion member engagement, and transmit big moment of torsion.As a result, the wheel tooth of this sun gear spare is exposed under periodicity or the circuit heavy duty condition.Turn in the journey at sun gear spare one, the load number of times that is added on each sun gear tooth is proportional with the number of pinion member in this planetary gear set.The loading of this repetition can make the tired and wearing and tearing of matching surface of the wheel tooth of this sun gear spare.
In using a common transmission device of planetary gear set, this sun gear spare is not to be installed on the live axle rigidly, but by being connected with one group of internal spline of a corresponding or complementary external splines group engagement on this live axle.This spline allows this sun gear spare in transmitting torque, radially " is floating ", promptly does little motion.These radial motions help to redistribute moment of torsion equably between this pinion member, thereby increase total torque capacity of this gear train.Because this unsteady connection, this sun and pinion member except the torque loads of transmitting, also stand dynamic load accidentally.The common processing of using in making gear member can comprise gear hobbing, cutting, shaving, polishing, grinding, grinding, then is the hot chemical treatment such as carburizing one class.
The explanation of invention
A kind of net formed gear member is provided, and it has gear mass, and this gear mass has and is essentially columniform outer surface, the wheel tooth that a plurality of radially outwards that are shaped on it stretch out.Internal surface is essentially columniform outer surface arranged coaxial with this basically.This internal surface is to extend on the part of this gear mass at least.On at least a portion of this internal surface, form a plurality of splines that radially inwardly stretch out.In in the wheel tooth that these a plurality of radially outwards stretch out at least one and these a plurality of splines that radially inwardly stretch out at least one is cold-stamped.
This gear member also can be included in the spline that a plurality of radially outwards of forming on this at least a portion that is essentially columniform outer surface stretch out.The spline that these a plurality of radially outwards stretch out can be in axial wheel tooth disposed adjacent of stretching out with these a plurality of radially outwards.The tooth that this radially outward stretches out can be spiral in shape, and this gear mass can be formed from steel, but makes this gear member can be enough to be used as an input sun gear in the self-shifting automotive trannsmission system.This gear mass can form at least one hole, is used for being essentially communication of fluid between the columniform outer surface at this internal surface and this.In a preferred embodiment, this gear member is through Overheating Treatment.
The method of making gear member also is provided.This method comprises that being essentially columniform metal bar by one of reverse extruding forms a blank that is essentially tubulose.This blank that is essentially tubulose has internal surface and outer surface.Then, at least a portion of this outer surface, form the wheel tooth that a plurality of radially outwards stretch out by cold hobbing, with formative gear spare.
This method also can be included in and form before the wheel tooth that a plurality of radially outwards stretch out, and this blank that is essentially tubulose is annealed, to reduce the internal stress in this is essentially the blank of tubulose.In addition, at least a portion of this internal surface, form a plurality of splines that radially inwardly stretch out by cold hobbing.This method also can be included in formation, and this is essentially before the blank of tubulose, with lubricator applies this and is essentially columniform metal bar.Equally, before the wheel tooth that a plurality of radially outwards of formation stretch out, this is essentially the blank of tubulose available lubricant applying.At last, can the heat treatment gear member, to improve its hardness.
These characteristics of the present invention and advantage and other characteristics and advantage are from below in conjunction with understanding easily the accompanying drawing the following detailed description of the embodiment of the present invention.
Brief Description Of Drawings
But Fig. 1 is the perspective view according to the net formed input sun gear spare of self-shifting automotive trannsmission system of the present invention;
Fig. 2 a is the cross-sectional side view that is used to form the metal bar of net formed input sun gear spare shown in Figure 1;
Fig. 2 b is for utilizing oppositely or extrusion process backward, the cross-sectional side view of the gear blank that is formed by metal bar shown in Fig. 2 a;
Fig. 2 c is the cross-sectional side view of the gear blank of Fig. 2 b remove the disc that forms in extrusion process backward after;
Fig. 2 d for the wheel tooth and a plurality of spline that radially inwardly stretches out that form a plurality of radially outwards from the blank of Fig. 2 c and stretch out after, the cross-sectional side view of the net formed input sun gear spare of Fig. 1;
Fig. 2 e is after forming profile, the cross-sectional side view of the net formed input sun gear spare of Fig. 2 d;
Fig. 2 f is behind spline and a plurality of opening or hole that a plurality of radially outwards of formation stretch out, the cross-sectional side view of the net formed input sun gear spare of Fig. 2 e.
The preferred embodiment explanation
Identical part represented in identical code name in the accompanying drawing.Fig. 1 represents gear member 10.Gear member 10 comprises having and is essentially the columniform outer surface that step arranged 14 and is essentially the columniform gear member 12 that the internal surface 16 of step is arranged.In a preferred embodiment, but this gear member 10 as the input sun gear spare of self-shifting automotive trannsmission system.Yet, should understand, under the condition that does not change notion of the present invention, gear member 10 of the present invention can use in various applications.
A plurality of radially-protruding basically wheel teeth 18 are protruding from outer surface 14.This wheel tooth 18 can with the small gear gear spare engagement in the planetary gear set of another gear member-for example, to transmit rotary torque.This wheel tooth 18 is preferably spiral in shape, yet the people that technical experience is abundant knows, in remaining on the scope of claims in, can use the commutating tooth gear teeth of the wheel tooth of other shapes-for example.Being characterized as of wheel tooth 18 of the present invention, it is " net formed ", promptly in order to form and finish wheel tooth 18, wheel tooth 18 need on a small quantity or not to need machining-for example gear hobbing, cutting, honing etc.Illustrate in greater detail the method for formative gear tooth 18 below with reference to Fig. 2 d.
Shown in Fig. 2 d～2f, a plurality of radially-protruding basically splines 20 inwardly stretch out from internal surface 16 basically at the end of the gear mass opposite with wheel tooth 18.Spline extends axially at least a portion of internal surface 16, and this spline 20 can hold the input shaft that does not illustrate with complementary splined section.Spline 20 of the present invention to be characterized as it be to form purely.Below, illustrate in greater detail the method that forms spline 20 with reference to Fig. 2 d.
At the end of the gear mass 12 opposite with wheel tooth 18, a plurality of to be essentially radially-protruding spline 22 protruding basically from outer surface 14.Spline 22 extends axially at least a portion upper edge of outer surface 14.In addition, gear mass 12 forms a plurality of openings or hole 24, can between the outer surface 14 and internal surface 16 of gear mass 12 fluid is communicated with, thereby form the lubricant method between the spline 20 and 22.
The present invention also provides the method for making said gear part 10.Fig. 2 a～2f illustrates each step of this method for optimizing, wherein, draws with hacures in Fig. 2 b～2f according to the part of change of the present invention.Fig. 2 a represents a metal bar 26, and the Annealed Steel bar that it is made from the Steel Alloy consistent with the AISI of gear member 10 desirable metallurgical properties-for example 4620 downcuts.Preferably processing metal rod 26 remains in the acceptable tolerance range weight of metal bar 26 and size.For in the forming process shown in Fig. 2 b, metal is steadily rolled, metal bar 26 phosphate coating coating with lubricator-for example.Metal bar 26 is placed on the forming press, and carries out oppositely or backward pushing, form the gear blank 28 shown in Fig. 2 b.The people that technical experience is abundant knows, in extrusion process backward, metal bar 26 is placed in the model, then pin with a large amount of responsive to axial force on this metal bar 26, make the metal in this metal bar 26 flow formative gear blank 28 round this pin with on this model.This extrusion process backward produces compact crystal grain and flows in gear blank 28, thereby increases the strength of materials.General this gear blank 28 is a tubular shape, has an end by 30 sealings of a disc part.Getting back to Fig. 2 c can find out, gear blank 28 is placed on the press machine, pierces through or because of additive method removes this disc part 30, with formative gear blank 28A.Then, make this gear blank 28A annealing, be released in the residualinternal stress that forms in the extrusion process backward of Fig. 2 b, and make gear blank 28A be ready for other cold working process.In addition, in order to make metal smooth flow in the forming process of Fig. 2 d, the gear blank of phosphate coating with lubricator-for example 28A.
Fig. 2 d represents the gear member 10 that utilizes cold hobbing to be formed by gear blank 28A.In this forming process, formative gear tooth 18 on the outer surface of gear mass 12 forms spline 20 simultaneously on the internal surface 16 of gear member 12.The cold hobbing process forms wheel tooth 18 and the spline 20 have net formed characteristic, makes in order to make wheel tooth 18 and spline 20 have accurately machined gear tooth profile and surface finishment, and needs in a small amount or do not need fine finishing-for example honing, polishing, grinding or grinding.In addition, because the mechanical cold working of cold hobbing process, near the crystal grain of the compactness the root of wheel tooth 18 and spline 20 flows can increase the intensity of wheel tooth 18 and spline 20.
Shown in Fig. 2 e, the outer surface 14 of gear mass 12 can make desirable profile or shape.It is known on can operation technique that any method-for example grinding, turning etc. make the profile of gear mass 12.In addition, the end 21 of gear mass 12 is made squarely, reach the final lengths of gear mass 12.Shown in Fig. 2 f, after making profile, on the outer surface 14 of gear mass 12, form spline 22.In the preferred embodiment, spline 22 is to utilize broaching to form.Yet the people that technical experience is abundant knows under the condition in being retained in the scope of claims, the additive method that forms spline 22 to be arranged.In addition, shown in Fig. 2 f, utilize known hole formation method on existing or the other technologies, in gear mass 12, form hole 24.In the preferred embodiment, then, use carbonitride to handle, gear member 10 is heat-treated, forming case depth is that 0.30～0.43mm and core hardness are 32～44Rc.
By utilizing net formed process-for example cold hobbing, formative gear tooth 18 and spline 20, because in the metal of formative gear tooth 18 and spline 20, crystal grain flows and improves, the moment of torsion bearing capacity of gear member 10 can improve.In addition, can eliminate the remaining cutting tool vestige or the surface roughness that cause by cutting and finishing step, thereby the stress that reduces in wheel tooth 18 and spline 20 raises.
Though understand the preferred embodiments of the present invention in detail, the people who is familiar with technology involved in the present invention knows within the scope of the appended claims, various other realizations design of the present invention and embodiment to be arranged.
Claims (20)
1. net formed gear member comprises:
A gear mass, the outer surface with the substantial cylindrical that has the wheel tooth that a plurality of radially outwards that are shaped stretch out thereon;
An internal surface forms by reverse extruding, roughly be roughly the setting of columniform outer surface coaxial line with described, and described internal surface extends at least a portion of described gear mass; With
The a plurality of splines that radially inwardly stretch out that at least a portion of described internal surface, are shaped;
Wherein, at least one of the wheel tooth that described a plurality of radially outwards stretch out and at least one of described a plurality of splines that radially inwardly stretch out be by cold hobbing, thereby be reduced to the required process step of gear member of producing this shaping.
2. gear member as claimed in claim 1 is characterized by, and also comprises: the wheel tooth that contiguous vertically described a plurality of radially outwards stretch out described is roughly at least a portion of columniform outer surface, the spline that a plurality of radially outwards that are shaped stretch out.
3. gear member as claimed in claim 1 is characterized by, and described outwardly directed wheel tooth is spiral-shaped, and described gear mass is formed from steel and is enough to be used as the input sun gear of automatic speed changing automotive trannsmission system.
4. gear member as claimed in claim 1 is characterized by, and described gear mass limits at least one in described internal surface and the described hole that fluid is communicated with that is roughly.
5. gear member as claimed in claim 1 is characterized by, and described gear mass make described gear mass have case depth, and the core hardness of described gear mass is 32～44Rc through Overheating Treatment.
6. gear member as claimed in claim 2 is characterized by, and the spline that described a plurality of radially outwards stretch out is broached.
7. the method for a formative gear spare comprises:
Utilize oppositely one of extruding to be roughly columniform metal bar and form a blank that is roughly pipe shape, the wherein said blank that is roughly pipe shape has an internal surface and an outer surface; With
Utilize cold hobbing at least one part of described outer surface, to form the wheel tooth that a plurality of radially outwards stretch out, with formative gear spare.
8. method as claimed in claim 7 is characterized by, and also comprises:
Before the wheel tooth that the described a plurality of radially outwards of formation are stretched, make the described rough annealing that is roughly pipe shape.
9. method as claimed in claim 7 is characterized by, and also comprises:
Utilize cold hobbing, at least a portion of described internal surface, form a plurality of splines that radially inwardly stretch out.
10. method as claimed in claim 7 is characterized by, and also comprises:
Before forming the described blank that is roughly tubular shape, with lubricator apply the described columniform metal bar that is roughly.
11. method as claimed in claim 7 is characterized by, and also comprises:
Before the wheel tooth that the described a plurality of radially outwards of formation stretch out, with lubricator apply the described blank that is roughly tubulose.
12. method as claimed in claim 7 is characterized by, and also comprises:
On at least a portion of described outer surface, form the spline that a plurality of radially outwards stretch out.
13. method as claimed in claim 7 is characterized by: also comprise:
Form at least one hole, can make fluid connection between described internal surface and the described outer surface.
14. method as claimed in claim 12 is characterized by, and also comprises:
Before the spline that the described a plurality of radially outwards of formation stretch out, form the profile of described outer surface.
15. method as claimed in claim 7 is characterized by, and also comprises:
At least a portion of this gear member of heat treatment.
16. but a method that forms the input sun gear spare of self-shifting automotive trannsmission system, this method comprises:
Utilize one of reverse extruding to be roughly columniform metal bar, form a blank that is roughly tubulose, wherein, the described blank that is roughly tubulose has internal surface and outer surface;
With the described rough annealing that is roughly tubulose;
Utilize cold hobbing, at least a portion of described internal surface, form a plurality of splines that radially inwardly stretch out; With
Utilize cold hobbing, at least a portion of described outer surface, form the wheel tooth that a plurality of radially outwards stretch out, to form this input sun gear spare.
17. method as claimed in claim 16 is characterized by, and also comprises:
Before forming the described blank that is roughly tubulose, utilize coating to apply the described columniform metal bar that is roughly based on phosphate.
18. method as claimed in claim 16 is characterized by, and also comprises:
Before the wheel tooth that the described a plurality of radially outwards of formation stretch out, utilize the described blank that is roughly tubulose of coating coating based on phosphate.
19. method as claimed in claim 16 is characterized by, and also comprises:
By broaching, at least a portion of described outer surface, form the spline that a plurality of radially outwards stretch out.
20. method as claimed in claim 16 is characterized by, and also comprises:
Heat treatment should be imported at least a portion of sun gear spare.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US77457406P | 2006-02-17 | 2006-02-17 | |
| US60/774,574 | 2006-02-17 | ||
| US60/774574 | 2006-02-17 | ||
| US11/619339 | 2007-01-03 | ||
| US11/619,339 | 2007-01-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101025225A CN101025225A (en) | 2007-08-29 |
| CN100564951C true CN100564951C (en) | 2009-12-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100841774A Expired - Fee Related CN100564951C (en) | 2006-02-17 | 2007-02-17 | Net formed gear member and manufacture method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100564951C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100083502A1 (en) * | 2008-10-03 | 2010-04-08 | Joseph Szuba | Method of forming a one piece component |
| CN101804549B (en) * | 2010-04-15 | 2011-05-04 | 南通振华重型装备制造有限公司 | Processing and milling method of large-module crawling gear for ocean platform |
| CN104646975B (en) * | 2015-02-13 | 2017-01-25 | 湖南中联重科车桥有限公司 | Wheel rim speed reducer gear ring and manufacturing method thereof |
| JP6693374B2 (en) * | 2016-09-29 | 2020-05-13 | アイシン・エィ・ダブリュ株式会社 | Ring gear and ring gear manufacturing method |
| CN110242730A (en) * | 2019-05-28 | 2019-09-17 | 无锡腾马精密机械有限公司 | Planetary reducer sun gear and input shaft, planet carrier package assembly |
| CN112845795B (en) * | 2020-12-28 | 2023-03-21 | 浙江格洛博机械科技股份有限公司 | Continuous spline forming equipment for inner hub of gearbox brake |
-
2007
- 2007-02-17 CN CNB2007100841774A patent/CN100564951C/en not_active Expired - Fee Related
Non-Patent Citations (6)
| Title |
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| 花键离合齿轮镦挤复合成形. 张水忠，刘淑梅，李霞.热加工工艺，第5期. 2003 |
| 花键离合齿轮镦挤复合成形. 张水忠，刘淑梅，李霞.热加工工艺，第5期. 2003 * |
| 金属反向挤压技术及其应用（1）. 刘静安.铝加工，第2卷2卷第5期. 1999 |
| 金属反向挤压技术及其应用（1）. 刘静安.铝加工，第2卷2卷第5期. 1999 * |
| 齿轮冷挤压加工研究. 何大开.压力加工，第8期. 2005 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101025225A (en) | 2007-08-29 |
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Granted publication date: 20091202 Termination date: 20130217 |