CN1355874A - IVT components - Google Patents

IVT components Download PDF

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Publication number
CN1355874A
CN1355874A CN00808962A CN00808962A CN1355874A CN 1355874 A CN1355874 A CN 1355874A CN 00808962 A CN00808962 A CN 00808962A CN 00808962 A CN00808962 A CN 00808962A CN 1355874 A CN1355874 A CN 1355874A
Authority
CN
China
Prior art keywords
ivt
steel
dish
roller
assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN00808962A
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Chinese (zh)
Inventor
约翰·迈克尔·贝斯威克
艾丹·迈克尔·克里根
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF Engineering and Research Centre BV
Original Assignee
SKF Engineering and Research Centre BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SKF Engineering and Research Centre BV filed Critical SKF Engineering and Research Centre BV
Publication of CN1355874A publication Critical patent/CN1355874A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/32—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line
    • F16H15/36—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface
    • F16H15/38—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces
    • 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
    • F16H55/32—Friction members

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Rolling Contact Bearings (AREA)
  • Friction Gearing (AREA)
  • Powder Metallurgy (AREA)

Abstract

IVT组件,其包含一输入盘和输出盘。每个盘是配备有一滚道,且输入和输出盘的滚道是相互面对。它们之间具有辊。该辊具有使得动力辊的滚道和位置相对于盘能够改变从而改变盘之间的传动比的表面。An IVT assembly includes an input disc and an output disc. Each disc is equipped with a raceway, and the raceways of the input and output discs face each other. A roller is positioned between them. The roller has a surface that allows the raceway and position of the powered roller to be changed relative to the discs, thereby varying the transmission ratio between the discs.

Description

The IVT assembly
The present invention relates to a kind of transmitting assemblies that comprises powder metallurgy type high alloy steel.This kind alloy assembly is found in EP-0462637A.In this application, provided the transmission device of a continuous variable, wherein belt extends between two band rollers of variable effective diameter.At least one contact surface of band roller and belt is to cover with coating by powder metallurgy method.From base roller, this kind layer was provided with in the latter half of making.The operational condition of continuous variable transmission shows as lower contact pressure between belt and band roller.Operation does not promptly have the oiling agent existence to carry out down normally under the condition of doing.
The present invention relates to a kind of IVT assembly.Below, IVT should be understood to the IVT of annular, and more specifically is interpreted as its dish and roller.Dish, roller contact surface separately stand high contact load having under the condition of oiling agent.As for roller bearing, the contact pressure between the raceway of the circumferential surface of live roll and dish is obviously higher.Under the situation that does not have lubricating film to exist, high contact fatigue strength requirement and static load capacity requirement have been set.
Find that common rolling bearing steel does not satisfy these requirements.
The present invention aims to provide a kind ofly to have improved performance and makes it be specially adapted to the assembly of IVT dish and live roll assembly.According to the present invention, this purpose is implemented, and wherein said transmitting assemblies comprises annular IVT dish or the roller by the powder metallurgical technique integral forming.
Integral forming is interpreted as comprising fully powder metal materials.This is to be different from the EP-0462637 that one deck powder metal materials wherein only is provided.Only for example coil and be more preferably live roll, under high contact fatigue load discharges, can realize enough working life by integral forming IVT assembly.
As mentioned above, the present invention is the live roll that is particularly useful for making IVT.
More particularly, the component that is used for the steel of IVT assembly comprises:
0.75-1.85wt％C
0.10-0.45wt％Si
0.15-0.0wt％Mn
3.50-4.50wt％Cr
4.00-11.00wt％Mo
0.90-5.25wt％V
0.10-13.00wt％W.
According to embodiment preferred, used PM M62 shaped steel comprises:
1.25-1.35wt％C
0.15-0.4wt％Si
0.15-0.40wt％Mn
3.50-4.25wt％Cr
10.00-11.00wt％Mo
1.80-2.20wt％V
5.75-6.75wt％W.
Though be used for the cost of this class steel and be apparently higher than the common rolling bearing steel cost of ASTMA295 52100 for example, its performance makes it be more suitable in CVT/IVT dish and live roll assembly than common rolling bearing steel far away.By suitable processing, can realize that the surface of PM M62 steel part has high hardness.Yet, being different from the plain carbon steel that obtains extreme hardness, the toughness of the core in PMM62 can not worsen.This means that toughness/hardness ratio is the ASTM A295 52100 rolling bearing steel apparently higher than the martensitic hardening of routine.
Sintered steel can make with any known method in related domain.For example, through the following steps:
Vacumn induction fusion and refining powder metallurgy steel compositions,
The nitrogen powder atomization,
Powder sorting and encapsulation,
The hot isostatic pressing punching press and
Forge hot is pressed.
Other technology that also comprises Plastic Forming with low cost.
Preferably, the powder metallurgy high alloy steel is to stand secondary hardening post-curing to handle.Preferably, by at 1205 ± 5 ℃ of following austenitizing 5-10 minutes, under about 550 ℃, carry out gas, oil or salt subsequently and quench and tempering.Use therein in the above-mentioned preferred embodiment of M62, hardness can be up to 67HRC, and has the high temperature hardness performance.
To further specify the present invention referring now to accompanying drawing.
Fig. 1 has shown the example of IVT;
Fig. 2 has shown the comparison diagram of contact stress; With
Fig. 3 has shown the comparison diagram of blunt notch toughness.
In Fig. 1, provided the example of CVT/IVT.In the most common embodiment, other gear case assembly of the input disc 1 that CVT/IVT comprises the output shaft that is connected to engine and the relative output disc 2 that is connected to chain or vehicle or other object of driving with variable ratio.Be several live rolls 3 therebetween.Live roll 3 can be represented as axle journal and its usefulness 4 on any rotatingshaft.This rotatingshaft rotates on the direction of arrow 5.By the rotation of other roller in arrow 5 directions, the velocity ratio between the input and output dish will change.As shown in Figure 1, the input disc that live roll 3 is provided with it approaches center line, and output disc is configured to the center line away from it.Having pressure is compacted to the circumferential surface of live roll respectively on the raceway 9 of the raceway 8 of input disc and output disc.This impacting force is to schematically illustrate with arrow 10.Also be known as " TorotrakIVT " at the CVT/IVT shown in Fig. 1.Also can use other device in related domain, but for all embodiments, in order to change the velocity ratio between the input and output dish, provide three live rolls at least, this makes and carries out some banking motions according to arrow 5.Find that also this kind structure can obtain 15% efficient that increases than the automatic transmission of routine, is different from rolling bearing, does not have lubricating film between the adjacent component of described structure.
The circumferential surface of each live roll and raceway 8 and 9 are to stand suitable load.The chances are that this up to now technology does not also have one of received reason for this.For example, the maximum contact stress between the circumferential surface of live roll and the relevant raceway can be up to 4Gpa.This is the contact pressure that runs into far above in common rolling bearing.In addition, the banking motion according to arrow 5 makes roller with respect to the dish slippage.This kind slippage does not exist in rolling bearing.Because fatigue cracking that repeated flex stress causes and fracture are in the news.The zone of dish in circle 11 is fragile especially.This means that the rolling contact fatigue intensity and the fatigue fracture intensity of traction surface (raceway) all are modified.Provided the general introduction of utmost point signal of load of several assemblies of CVT/IVT transmission below.
The IVT assembly Feature Failure mode
The input disc center connects The torsion of tooth bar radius The structural fatigue cracking
Stop slippage by the draw fluid input disc with respect to live roll Contact pressure is up to 3.5GPa Rolling contact fatigue decortication Surface fatigue is damaged structural loads and is strengthened contact fatigue
Live roll Contact pressure is up to 3.5GPa Rolling contact fatigue decortication Surface fatigue is damaged
By the obvious impacting force of waterpower plunger along dish or live roll cross section Warp architecture pressure The structural fatigue cracking
By the chain wheel drive dish Bending force at output driving wheel place The flexural fatigue cracking
Dish and live roll High-temperature (up to 120 ℃) and structural stress Increase and the axial clearance growth
Dish and live roll Oscillating load The structural fatigue cracking of strengthening
Fig. 2 has shown the rolling contact fatigue life under different contact stress.Common rolling bearing steel ASTM A295 52100 (dotted lines) are to compare with steel PM M62 of the present invention (solid line).Cycle-index (L50) is to be unit with 1,000,000 secondary stress circulations.
In Fig. 3, shown hardness with respect to blunt notch toughness.-.. is 52100 steel, and-■-demonstration PM M62.From this figure, can clearly be seen that although PM M62 steel has high hardness (67HRC), toughness is to be not less than standard martensite 52100 rolling bearing steel.
By using sintered steel and more specifically being the M62 composition, it may reduce the dish of CVT/IVT and the size of live roll under identical moment output.
Though above-mentionedly the M62 steel be referred to as preferred embodiment described the present invention, it must be understood that other high alloy sintered steel also can use in CVT/IVT and be within the scope of the present invention.

Claims (5)

1, a kind of transmitting assemblies, it comprises powder metallurgy type high alloy steel, it is characterized in that, and described assembly comprises by the annular disk of powder metallurgical technique integral forming or roller.
2, according to the assembly of claim 1, wherein said ladle contains:
0.75-1.85wt％C
0.10-0.45wt％Si
0.15-0.50wt％Mn
3.50-4.50wt％Cr
4.00-11.00wt％Mo
0.90-5.25wt％V
0.10-13.00wt％W.
3, assembly according to claim 1 and 2, it comprises M62 shaped steel.
4, according to one of the aforementioned described assembly of claim, it comprises dish.
5, according to one of the aforementioned described assembly of claim, it comprises live roll.
CN00808962A 1999-06-15 2000-06-15 IVT components Pending CN1355874A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1012328A NL1012328C2 (en) 1999-06-15 1999-06-15 CVT / IVT part.
NL1012328 1999-06-15

Publications (1)

Publication Number Publication Date
CN1355874A true CN1355874A (en) 2002-06-26

Family

ID=19769380

Family Applications (1)

Application Number Title Priority Date Filing Date
CN00808962A Pending CN1355874A (en) 1999-06-15 2000-06-15 IVT components

Country Status (7)

Country Link
EP (1) EP1204827A2 (en)
JP (1) JP2003502496A (en)
KR (1) KR20020012606A (en)
CN (1) CN1355874A (en)
AU (1) AU5714800A (en)
NL (1) NL1012328C2 (en)
WO (1) WO2000077268A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1016811C2 (en) 2000-12-06 2002-06-13 Skf Ab Roller bearing comprising a part obtained with powder metallurgy technique.
US8152687B2 (en) 2007-01-24 2012-04-10 Torotrack (Development) Limited Powdered metal variator components
GB2459857A (en) * 2008-05-07 2009-11-11 Torotrak Dev Ltd A CVT variator with sintered components

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516963A (en) * 1983-05-23 1985-05-14 Borg-Warner Corporation Power transmission chain-belt
JP2777373B2 (en) * 1988-06-28 1998-07-16 日産自動車株式会社 Heat- and wear-resistant iron-based sintered alloy
NL9001392A (en) * 1990-06-19 1992-01-16 Volvo Car Bv PULLEY DRIVE ASSEMBLY FOR A TRANSMISSION FITTED WITH A FLEXIBLE TRANSMISSION BODY.
JPH05132743A (en) * 1991-11-09 1993-05-28 Daido Steel Co Ltd bearing
JPH05239602A (en) * 1992-02-25 1993-09-17 Daido Steel Co Ltd High bearing pressure parts
JP3241491B2 (en) * 1993-06-29 2001-12-25 大同特殊鋼株式会社 Rolling bearing for high temperature and high speed rotation

Also Published As

Publication number Publication date
NL1012328C2 (en) 2000-12-22
AU5714800A (en) 2001-01-02
EP1204827A2 (en) 2002-05-15
WO2000077268A3 (en) 2001-06-28
KR20020012606A (en) 2002-02-16
WO2000077268A2 (en) 2000-12-21
JP2003502496A (en) 2003-01-21
NL1012328A1 (en) 2000-12-19

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C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication