GB2265437A - Twin mass flywheel - Google Patents

Twin mass flywheel Download PDF

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Publication number
GB2265437A
GB2265437A GB9206665A GB9206665A GB2265437A GB 2265437 A GB2265437 A GB 2265437A GB 9206665 A GB9206665 A GB 9206665A GB 9206665 A GB9206665 A GB 9206665A GB 2265437 A GB2265437 A GB 2265437A
Authority
GB
United Kingdom
Prior art keywords
flywheel
mass
masses
twin
twin mass
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.)
Withdrawn
Application number
GB9206665A
Other versions
GB9206665D0 (en
Inventor
Robert John Murphy
Richard David Maitland Cooke
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.)
Automotive Products PLC
Original Assignee
Automotive Products PLC
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 Automotive Products PLC filed Critical Automotive Products PLC
Priority to GB9206665A priority Critical patent/GB2265437A/en
Publication of GB9206665D0 publication Critical patent/GB9206665D0/en
Publication of GB2265437A publication Critical patent/GB2265437A/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
    • F16F15/13128—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses the damping action being at least partially controlled by centrifugal masses
    • F16F15/13135—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses the damping action being at least partially controlled by centrifugal masses simple connection or disconnection of members at speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G3/00—Other motors, e.g. gravity or inertia motors
    • F03G3/08—Other motors, e.g. gravity or inertia motors using flywheels
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
    • F16F15/13157—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses with a kinematic mechanism or gear system, e.g. planetary

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

A twin mass flywheel (10) for a vehicle comprising two coaxially arranged flywheel masses (11, 12) which are mounted for limited angular rotation relative to each other. The flywheel masses (11, 12) are interconnected by pivot linkages (40) which include bob weights (41). Both of said flywheel masses (11, 12) have a starter gear ring (27, 37) thereon which in use are engageable with starter motor drive. This reduces noise on vehicle start up. <IMAGE>

Description

A TWIN MASS FLYWHEEL The present invention relates to a twin mass flywheel arrangement for absorbing or compensating for torsional vibrations such as can arise in a vehicle transmission assembly.
During the start-up of an engine driveline containing a Twin Mass Flywheel, the input and output halves of the flywheel move relative to each other due to the resistance of the engine cylinder compression and then the force of the engine firing. This movement between full drive and full overdrive conditions causes noise from collisions at the overtravel stops.
It is proposed to couple the two halves of a twin mass flywheel together by some method over this start-up period and thereby preventing any relative movement would remove the noise. The present invention provides this link with the engaged starter motor. The starter ring is divided across the two flywheel halves and when the starter motor gear is engaged, the halves are driven together and spun up until the starter gear retracts. At this point the two flywheel masses are free to move relative to each other but by then the stiffness and the hysteresis within the clutch flywheel mass are sufficient to prevent any violent overtravel collisions.
More particularly, the invention relates to a twin mass flywheel of the type described in WO 89/01097 in which two coaxial flywheel masses which are mounted for limited angular rotation relative to each other; and a plurality of pivotal linkages interconnect the two flywheel masses each comprising a first link pivotally connected one of the flywheel masses, and a second link pivotally connecting the first and second links.
The present invention provides a twin mass flywheel which overcomes the above problems associated with the start up procedure.
Accordingly there is provided a twin mass flywheel for a vehicle comprising two coaxially arranged flywheel masses which are mounted for limited angular rotation relative to each other, at least one of said flywheel masses having a first engagement means thereon which in use is engageable with starter motor drive characterised in that the other of said two flywheel mass has a second engaging means thereon which also is engagable with the starter motor drive.
Preferably the first and second engagement means are starter gear rings which are each secured to their respective flywheel masses by any suitable means such as welds, screws, heat shrinking.
Preferably the twin mass flywheel is of the type in which the two flywheel masses are interconnected by a plurality of pivotal linkages, each linkage comprising a first link pivotally connected to one of the flywheel masses and a second link pivotally connected to the other of the flywheel masses, and a pivot for pivotally connecting the first and second links, said linkage having a greater mass adjacent the pivot so that centrifugal force will cause the pivot to move radially outwardly.
The invention will be described by way of example and with reference to the accompanying drawings in which: Fig 1 is a cross sectioned view of a twin mass flywheel according to this invention; and Fig 2 is a cross section in the line II-II of Fig 1 also showing a friction clutch in situ thereon.
With reference to Figures 1 and 2 of the accompanying drawings there is illustrated a twin mass flywheel 10 which is divided into two flywheel masses 11 and 12.
The flywheel mass 11 is fixed on a crankshaft X of an internal combustion engine (not shown) by way central hub 14 and bolts 18 and in use a friction clutch Y is secured to the flywheel mass 12. Under normal drive conditions the flywheel masses 11, 12 rotate in an anti clockwise direction in the view shown in Figure 1.
Ducts 12A for the passage of cooling air are provided in the flywheel mass 12. The flywheel mass 12 is mounted on the central hub 14 via a bearing 19.
The flywheel mass 11 comprises the hub 14 which is fixed on crankshaft, a plate 15 fixed to the hub 14 by screws (not shown) and an annular outer mass 17 fixed to plate 15 by bolts or by rivets 36 (not shown).
A reluctance device 16 for electronic engine control system is secured to an outer periphery of the outer mass 17. A starter gear ring 27 is also mounted on outer mass 17. The starter ring 27 can be mounted in position by bolts, welding, heat shrinking, etc. or could be formed as an integral part of the outer mass.
The second flywheel mass 12 is mounted rotatably to the first flywheel mass 11 by way of bearing 19. The bearing 19 is non-rotatably mounted on the hub 14 and is secured in place by means of an annular plate 28.
The outer race of the bearing 19 is non-rotatably mounted in the centre of the flywheel mass 12 and is secured in place by means of a retaining ring 29 and circlip 30.
A second starter gear ring 37 is secured to the outer periphery of the second flywheel mass again by welding, screws, rivets etc. Again the starter ring 37 could be formed as an integral part of the second flywheel mass.
Relative rotation between the two flywheel masses 11 and 12 is controlled by a plurality of pivotal linkages 40 evenly spaced around the flywheel masses, preferably there are five such linkages, and by friction damping means 50. Each pivotal linkage 40 comprises a first link 41 pivotally mounted on a centre hub portion 31 of the flywheel mass 12 by way of a pivot 43 and a second link 42 pivotally mounted on the flywheel mass 11 by way of pivot 44, the two links 41 and 42 being pivotally connected to each other by means of a third pivot 45. It will be noted from Figure 1 that the pivot 43 is positioned radially inwardly of the pivots 44 and 45 and that the pivot 45 is positioned radially inwardly of the pivot 44. The first link 41 is formed as a bob weight mass having a greater mass at its end remote from the pivot 43.The second link 42 comprises a pair of parallel arms which are arranged one on each axial side of the bob weight 41. Each radial side of the bob weight 41 is curved and the radius of curvature is substantially the same as that of a central hub portion 31 of the flywheel mass 12, to enable the bob weights to engage with the hub portion along a substantial part of their length to facilitate the construction of a compact unit.
The friction damping means 50 comprises an annular plate 51 having a friction washer 57 thereon. The plate 51 has at least one radial extension 54 that is engaged by an extension of the pivot 43 so that the plate 51 is rotationally fast with the second flywheel mass 12. The plate 51 is mounted on the centre hub 14 with the friction washer 57 adjacent the first flywheel mass 11.
A plurality of friction washers 55, preferably seven friction washers A - G are located in an annular housing 53 which has at least one axially extending leg 56 on its outer periphery that engages in the plate 51 so that the housing 53 is coupled rotationally fast with the second flywheel mass 12.
The housing 53 is cup shaped with an open end facing the friction plate 51 and it closed end adjacent the bearing 14. The friction washers 55 are arranged in two groups outer washers B D F which have apertures in their outer peripheries that engage with lug(s) 56 so that they are rotationally fast with the second flywheel mass, and inner washers A C E and G which engage on their inner peripheries with the hub 14 of the first flywheel mass.
If desired the lugs 56 on the housing 53 can engage in circumferentially elongated apertures in the outer periphery of the washers, B D and F which have differing circumferential lengths so that the friction washers B D & F operate at different degrees of relative rotation between the two flywheel masses 11 & BR< 12 to give a variable hysteresis effect.
The stack of washers 55 A - G and the friction washer 57 are biased into frictional engagement with adjacent surfaces by a belleville washer 52 acting between the bearing retaining ring 29 and the housing 53, Operation of the twin mass flywheel shown in Figures 1 to 2 will now be described. Under no-load conditions with the clutch disengagement, centrifugal force acts on the pivotal linkages 40 and particularly on the bob weights 41 and urges the linkages in a radially outward direction. At higher rotational speeds the centrifugal force is greater and whilst this does not affect the configuration under no-load conditions it greatly affects the force required to move the flywheel mass 12 relative to the flywheel mass 11.
If the clutch is engaged and power is transmitted from flywheel mass 11 to flywheel mass 12 there is a tendency for the two masses to rotate relative to each other. At relatively low speeds when the influence of centrifugal force is small the flywheel masses move readily relative to each other. However at relatively high speeds the influence of centrifugal force is much greater and relative rotation of the flywheel masses requires greater force.
Under conditions of over-run the effects are similar except that in the embodiments described the link 42 folds under the bob weight 41, and the curved face of the bob weight eventually comes to bear against a buffer (not shown) on the hub centre portion of the flywheel mass 12 which forms a travel stop and prevents further relative movement of the flywheel masses.
The friction damping 50 is also operative during the relative rotational movement between the twin flywheel mass 11 or 12. The friction plate 51 is rotationally fast with the second flywheel mass 12 and the friction washer 57 and rubs on the plate 15 of the first friction mass 11.
The variable hysteresis washers 55 will also come into operation as the housing 53 moves with the second flywheel mass 12 and the lug(s) 56 come into abutment with the respective end(s) of the apertures in the washers B D & F which accommodate said lugs.
The friction washers 55 can have different friction materials thereon with differing coefficients of friction.

Claims (9)

1. A twin mass flywheel for a vehicle comprising two coaxially arranged flywheel masses which are mounted for limited angular rotation relative to each other, at least one of said flywheel masses having a first engagement means thereon which in use is engageable with starter motor drive characterised in that the other of said two flywheel mass has a second engaging means thereon which also is engagable with the starter motor drive.
2. A twin mass flywheel as claimed in Claim 1 wherein the first engagement means is a starter gear ring which is engagable with a pinion on the starter motor.
3. A twin mass flywheel as claimed in Claim 1 or Claim 2 wherein the second engagement means comprises a gear ring engagable with a piston on the starter motor.
4. A twin mass flywheel as claimed in Claim 2 or Claim 3 wherein the or each starter gear ring has a lead-in on the gear teeth which lead-in faces the direction of entry of the for the starter motor pinion.
5. A twin mass flywheel as claimed in any one of Claims 2 to 4 wherein the or each starter gear ring is formed separately from the respective flywheel mass and is secured thereto.
6. A twin mass flywheel as claimed in any one of Claims 1 to 5 wherein the two flywheel masses are interconnected by a plurality of pivotal linkages, each linkage comprising a first link pivotally connected to one of the flywheel masses and a second link pivotally connected to the other of the flywheel masses, and a pivot for pivotally connecting the first and second links, said linkage having a greater mass adjacent the pivot so that centrifugal force will cause the pivot to move radially outwardly.
7. A twin mass flywheel as claimed in Claim 6 wherein a friction damping means is provided which in use resists relative rotation between the two flywheel masses.
8. A twin mass flywheel as claimed in Claim 7, wherein the friction damping means comprises a plurality of friction plates some of which are rotationally fast with one flywheel mass, and the others of which are rotationally fast with the other flywheel mass.
9. A twin mass flywheel substantially as described herein and as illustrated in the accompanying drawings.
GB9206665A 1992-03-27 1992-03-27 Twin mass flywheel Withdrawn GB2265437A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9206665A GB2265437A (en) 1992-03-27 1992-03-27 Twin mass flywheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9206665A GB2265437A (en) 1992-03-27 1992-03-27 Twin mass flywheel

Publications (2)

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GB9206665D0 GB9206665D0 (en) 1992-05-13
GB2265437A true GB2265437A (en) 1993-09-29

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GB9206665A Withdrawn GB2265437A (en) 1992-03-27 1992-03-27 Twin mass flywheel

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994010477A1 (en) * 1992-10-27 1994-05-11 Automotive Products Plc A twin mass flywheel
FR2703419A1 (en) * 1993-04-03 1994-10-07 Fichtel & Sachs Ag Flywheel with reduced outer diameter.
WO1996029525A1 (en) * 1995-03-21 1996-09-26 Automotive Products Plc A twin mass flywheel friction damping device
FR2771466A1 (en) * 1997-11-27 1999-05-28 Mannesmann Sachs Ag ROTATION SWING SHOCK ABSORBER

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152159A (en) * 1983-12-16 1985-07-31 Sachs Systemtechnik Gmbh Friction disk clutch for a motor vehicle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152159A (en) * 1983-12-16 1985-07-31 Sachs Systemtechnik Gmbh Friction disk clutch for a motor vehicle

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994010477A1 (en) * 1992-10-27 1994-05-11 Automotive Products Plc A twin mass flywheel
EP0826900A2 (en) * 1992-10-27 1998-03-04 Automotive Products Plc A twin mass flywheel
EP0826900A3 (en) * 1992-10-27 1999-01-27 Automotive Products Plc A twin mass flywheel
FR2703419A1 (en) * 1993-04-03 1994-10-07 Fichtel & Sachs Ag Flywheel with reduced outer diameter.
WO1996029525A1 (en) * 1995-03-21 1996-09-26 Automotive Products Plc A twin mass flywheel friction damping device
GB2313648A (en) * 1995-03-21 1997-12-03 Automotive Products Plc A twin mass flywheel friction damping device
GB2313648B (en) * 1995-03-21 1999-07-14 Automotive Products Plc A twin mass flywheel friction damping device
CN1083953C (en) * 1995-03-21 2002-05-01 机动车产品股份有限公司 Twin mass flywheel friction damping device
FR2771466A1 (en) * 1997-11-27 1999-05-28 Mannesmann Sachs Ag ROTATION SWING SHOCK ABSORBER
US6244134B1 (en) 1997-11-27 2001-06-12 Mannesmann Sachs Ag Torsional vibration damper

Also Published As

Publication number Publication date
GB9206665D0 (en) 1992-05-13

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)