WO2004113758A1 - Twin mass flywheel - Google Patents
Twin mass flywheel Download PDFInfo
- Publication number
- WO2004113758A1 WO2004113758A1 PCT/GB2004/002574 GB2004002574W WO2004113758A1 WO 2004113758 A1 WO2004113758 A1 WO 2004113758A1 GB 2004002574 W GB2004002574 W GB 2004002574W WO 2004113758 A1 WO2004113758 A1 WO 2004113758A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- friction
- flange
- side plates
- masses
- mass flywheel
- Prior art date
Links
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
- F16F15/13164—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 characterised by the supporting arrangement of the damper unit
- F16F15/13171—Bearing arrangements
- F16F15/13178—Bearing arrangements comprising slide bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- 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
- F16F15/139—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 characterised by friction-damping means
-
- 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
- F16F15/13107—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 for damping of axial or radial, i.e. non-torsional vibrations
Definitions
- This invention relates to twin mass flywheels of the type, hereinafter referred to as being of the type described, having an input mass for connection with an engine, an output mass for connection with a transmission, bearing means supporting the masses for limited relative rotation, an annular radially extending flange connected adjacent to its outer or inner periphery with one of the masses, a pair of annular side plates located on either side of the flange and connected at their inner or outer peripheries with the other mass, and circumferentially extending spring means acting between the flange and the side plates to damp relative rotation between the masses.
- twin mass flywheels of the type described are well known and achieving increasing acceptance in motor vehicles in order to damp torsional vibrations introduced into the vehicle driveline by the vehicle engine, one of the problems associated with such flywheels is the tendency of the input and output masses to tilt relative to each other as they rotate as a result of the flexing of the engine crankshaft caused by the firing strokes of the engine.
- a twin mass flywheel of the type described which also includes a friction device acting between the masses, this friction device being located between the side plates and including a first friction member which acts between one of the side plates and the flange and a first axially acting spring located between the flange and said one side plate to load the first friction member against the side plate and take up any play between the friction member and the flange, thus tending to control any tipping of the side plates relative to the flange as the flywheel rotates.
- the friction device may also include further friction members which rotate with the side plates or flange respectively and which are biased axially into frictional engagement by a second axially acting spring also located between the side plates.
- the further friction members are pressed against the first friction member by the second axially acting spring which provides the main control over the frictional resistance of the device and the first axially acting spring means primarily provides control over the relative tipping of the masses and the level of friction provided by the first friction member.
- This first friction member can be arranged to operate during all relative rotation between the masses to provide, for example, the lower level of friction required at engine idle speeds whereas the further friction members may be arranged to operate progressively at large angles of relative rotation so that the overall desired friction characteristics of the device are achieved.
- the anti-tipping arrangement of the present invention may be capable of providing sufficient control over tipping to render the use of the arrangement described in the above referred to earlier application unnecessary.
- the two anti-tipping arrangements may be used together in a given twin mass flywheel application.
- Figure 1 shows an axial section through a twin mass flywheel in accordance with the present invention
- Figure 1a shows details of a wavy washer and associated friction member used in the flywheel of figure 1 ;
- Figure 1 b shows a view in the direction of arrow A if figure 1 a;
- Figure 2 shows a view on arrows C-C of figure 1 with part of the output flywheel mass cut away and showing some internal details in section;
- Figure 2a shows a view on line X-X of figure 2;
- Figure 3 shows details of a wavy washer used to provide tipping control in the twin mass flywheel of the present invention
- FIG. 4 shows details of an alternative bearing arrangement
- Figure 5 shows details of a variant in which the bearing support is formed as a separate component from the input flywheel mass.
- this shows a twin mass flywheel 10 having an input mass 11 for connection with an engine crankshaft via bolt holes 11a and an output mass 12 supported from the input mass 11 via a plain bearing 14 which is carried on an axially extending tubular extension 15 of the input mass 11.
- the output mass 12 can rotate through a limited circumferential distance relative to the input mass 11 under the control of compression springs 16.
- These springs (which may individually comprise two co-axial coils 16a and 16b to achieve the desired spring rate/characteristics) are housed in windows 17 in a flange 18 which is riveted at 19 to input mass 11 and in windows 20 in side plates 21 and 22 positioned on either side of the flange 18 and riveted to output mass 12 at 30, the rivets 30 including a spacing portion 31 to hold plates 21 and 22 apart.
- a friction device 32 which comprises a first plastics friction disc 35 having axial projections 36 which are keyed to flange 18 for rotation therewith.
- the friction device also includes a pair of friction discs 33 which are keyed at their outer peripheries within the radially inner portion of flange 18 and interleaved friction discs 34 which are keyed at their inner peripheries onto rivets 30.
- An axially acting spring in the form of a belleville spring 39 provides the axial loading to ensure that the friction discs generate the necessary frictional force.
- the keying of friction disc 35 to flange 18 is without any lost circumferential motion so that the low level of friction generated by friction disc 35 operates for all relative rotations of the input and output masses and provides a so-called idle rattle friction suppression of the twin mass flywheel.
- the keying of the discs 33 and 34 to their co-operating members 18 and 30 may be with or without lost motion in the circumferential sense (see lost motion 'x' shown in Figure 2) so that the overall friction characteristics of the friction device can be tuned to the particular vehicle on which the twin mass flywheel is to be used.
- an axially acting spring in the form of a wavy washer 40 (see Fig 3) is provided between flange 18 and plastics friction disc 35.
- Wavy washer 40 has pairs of circumferentially spaced ears 41 which engage the sides of projections 36 on the friction disc 35.
- Wavy washer 40 takes up any clearance between flange 18 and friction disc 35 and also helps to control any tendency for friction disc 35 and the contacted side plate 21 to tip relative to flange 18 during operation of the flywheel. This in turn helps to control tipping of the input and output masses 11 and 12 relative to each other.
- the flywheel also includes a stop arrangement to limit the relative rotation of the flywheel masses 11 and 12.
- This stop arrangement is provided by radially inwardly extending projections 24c on outer added mass ring 24b which move between pressed raised portions 22e in side plate 22. Rotation is limited when projections 24c strike the sides 22d of raised portions 22e. Typically this rotation is limited to 24 degrees in either direction (ie, 48 degrees total relative rotation).
- the circumferential zones 22c of side plate 22 between the raised portions 22e are close to the flange 18 as is the entire zone 21a of side plate 21.
- the outer peripheral portions 21a and 22a of the side plates 21 and 22 contact the radially outer portion 18a of flange 18 to resist tipping of the input and output masses of the flywheel due to flexing of the crankshaft etc as described and claimed in the previously referred to earlier application No 0228462.8.
- the level of tipping control provided by wavy washer 40 may be sufficient to render the contact between the outer peripheral portions 21a and 22a of the side plates and flange 18 unnecessary.
- Figure 4 also shows a modified bearing arrangement in which the output flywheel 12 is provided with a flange 12x which provides a locating abutment for the bearing 14 which is pressed into the output mass.
- This arrangement obviates the need to form the bearing with an L-shaped cross-section making it cheaper and easier to produce.
- this shows a further variant of the twin mass flywheel in which the bearing 14 is supported from a separate axially extending projection 45 which is pre-assembled to input mass 11 by, for example, welding or screwing, prior to the attachment of the twin mass flywheel to the vehicle crankshaft by the bolts which extend through bolt holes 11a.
- This construction is cheaper to produce and may also save weight.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
A twin mass flywheel (10) having an input mass (11) for connection with an engine, an output mass (12) for connection with a transmission, bearing means (14) supporting the masses for limited relative rotation, an annular radially extending fiange (18) connected adjacent to its outer or inner periphery with one (11) of the masses, a pair of annular side plates (21, 22) located on either side of the flange and connected at their inner or outer peripheries with the other mass (12), and circumferentially extending spring means (16) acting between the flange and the side plates to damp relative rotation between the masses. The flywheel also includes a friction device (32) acting between the masses, this friction device is located between the side plates (21, 22) and includes a first friction member (35) which acts between one (21) of the side plates and the flange (18) and a first axially acting spring (40) located between the flange (18) and sad one side plate (21) to load the first friction member (35) against the side plate (21) and take up any play between the friction member and the flange, thus tending to control any tapping of the side plates (21, 22) relative to the flange (18) as the flywheel rotates.
Description
TWIN MASS FLYWHEEL
This invention relates to twin mass flywheels of the type, hereinafter referred to as being of the type described, having an input mass for connection with an engine, an output mass for connection with a transmission, bearing means supporting the masses for limited relative rotation, an annular radially extending flange connected adjacent to its outer or inner periphery with one of the masses, a pair of annular side plates located on either side of the flange and connected at their inner or outer peripheries with the other mass, and circumferentially extending spring means acting between the flange and the side plates to damp relative rotation between the masses.
Whilst twin mass flywheels of the type described are well known and achieving increasing acceptance in motor vehicles in order to damp torsional vibrations introduced into the vehicle driveline by the vehicle engine, one of the problems associated with such flywheels is the tendency of the input and output masses to tilt relative to each other as they rotate as a result of the flexing of the engine crankshaft caused by the firing strokes of the engine.
It is an object of the present invention to provide a twin mass flywheel of the type described which is capable of at least mitigating this tipping of the flywheel masses relative to each other.
Thus, in accordance with the present invention, there is provided a twin mass flywheel of the type described which also includes a friction device acting between the masses, this friction device being located between the side plates and including a first friction member which acts between one of the side plates and the flange and a first axially acting spring located between the flange and said one side plate to load the first friction member against the side plate and take up any play between
the friction member and the flange, thus tending to control any tipping of the side plates relative to the flange as the flywheel rotates.
The friction device may also include further friction members which rotate with the side plates or flange respectively and which are biased axially into frictional engagement by a second axially acting spring also located between the side plates.
In a preferred arrangement the further friction members are pressed against the first friction member by the second axially acting spring which provides the main control over the frictional resistance of the device and the first axially acting spring means primarily provides control over the relative tipping of the masses and the level of friction provided by the first friction member. This first friction member can be arranged to operate during all relative rotation between the masses to provide, for example, the lower level of friction required at engine idle speeds whereas the further friction members may be arranged to operate progressively at large angles of relative rotation so that the overall desired friction characteristics of the device are achieved.
In the Applicant's earlier application number 0228462.8, there is described and claimed a twin mass flywheel of the type described in which the outer peripheries of the side plates remote from the connection with the other mass contact the flange on either side thereof to limit tipping of the masses relative to each other during relative rotation.
The anti-tipping arrangement of the present invention, with its first friction member and first axially acting spring between the flange and said one side plate, may be capable of providing sufficient control over tipping to render the use of the arrangement described in the above referred to earlier application unnecessary. Alternatively, the two anti-tipping arrangements may be used together in a given twin mass flywheel application.
One embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which:
Figure 1 shows an axial section through a twin mass flywheel in accordance with the present invention;
Figure 1a shows details of a wavy washer and associated friction member used in the flywheel of figure 1 ;
Figure 1 b shows a view in the direction of arrow A if figure 1 a;
Figure 2 shows a view on arrows C-C of figure 1 with part of the output flywheel mass cut away and showing some internal details in section;
Figure 2a shows a view on line X-X of figure 2;
Figure 3 shows details of a wavy washer used to provide tipping control in the twin mass flywheel of the present invention;
Figure 4 shows details of an alternative bearing arrangement, and
Figure 5 shows details of a variant in which the bearing support is formed as a separate component from the input flywheel mass.
Referring to Figure 1 this shows a twin mass flywheel 10 having an input mass 11 for connection with an engine crankshaft via bolt holes 11a and an output mass 12 supported from the input mass 11 via a plain bearing 14 which is carried on an axially extending tubular extension 15 of the input mass 11.
The output mass 12 can rotate through a limited circumferential distance relative to the input mass 11 under the control of compression springs 16. These springs (which may individually comprise two co-axial coils 16a and 16b to achieve the
desired spring rate/characteristics) are housed in windows 17 in a flange 18 which is riveted at 19 to input mass 11 and in windows 20 in side plates 21 and 22 positioned on either side of the flange 18 and riveted to output mass 12 at 30, the rivets 30 including a spacing portion 31 to hold plates 21 and 22 apart.
Inside the side plates a friction device 32 is provided which comprises a first plastics friction disc 35 having axial projections 36 which are keyed to flange 18 for rotation therewith. The friction device also includes a pair of friction discs 33 which are keyed at their outer peripheries within the radially inner portion of flange 18 and interleaved friction discs 34 which are keyed at their inner peripheries onto rivets 30. An axially acting spring in the form of a belleville spring 39 provides the axial loading to ensure that the friction discs generate the necessary frictional force.
The keying of friction disc 35 to flange 18 is without any lost circumferential motion so that the low level of friction generated by friction disc 35 operates for all relative rotations of the input and output masses and provides a so-called idle rattle friction suppression of the twin mass flywheel. The keying of the discs 33 and 34 to their co-operating members 18 and 30 may be with or without lost motion in the circumferential sense (see lost motion 'x' shown in Figure 2) so that the overall friction characteristics of the friction device can be tuned to the particular vehicle on which the twin mass flywheel is to be used.
In accordance with the present invention an axially acting spring in the form of a wavy washer 40 (see Fig 3) is provided between flange 18 and plastics friction disc 35. Wavy washer 40 has pairs of circumferentially spaced ears 41 which engage the sides of projections 36 on the friction disc 35. Wavy washer 40 takes up any clearance between flange 18 and friction disc 35 and also helps to control any tendency for friction disc 35 and the contacted side plate 21 to tip relative to flange 18 during operation of the flywheel. This in turn helps to control tipping of the input and output masses 11 and 12 relative to each other.
The flywheel also includes a stop arrangement to limit the relative rotation of the flywheel masses 11 and 12. This stop arrangement is provided by radially inwardly extending projections 24c on outer added mass ring 24b which move between pressed raised portions 22e in side plate 22. Rotation is limited when projections 24c strike the sides 22d of raised portions 22e. Typically this rotation is limited to 24 degrees in either direction (ie, 48 degrees total relative rotation). The circumferential zones 22c of side plate 22 between the raised portions 22e are close to the flange 18 as is the entire zone 21a of side plate 21.
In the arrangement shown in the drawings the outer peripheral portions 21a and 22a of the side plates 21 and 22 contact the radially outer portion 18a of flange 18 to resist tipping of the input and output masses of the flywheel due to flexing of the crankshaft etc as described and claimed in the previously referred to earlier application No 0228462.8. However, the level of tipping control provided by wavy washer 40 may be sufficient to render the contact between the outer peripheral portions 21a and 22a of the side plates and flange 18 unnecessary.
Figure 4 also shows a modified bearing arrangement in which the output flywheel 12 is provided with a flange 12x which provides a locating abutment for the bearing 14 which is pressed into the output mass. This arrangement obviates the need to form the bearing with an L-shaped cross-section making it cheaper and easier to produce.
Referring to Figure 5, this shows a further variant of the twin mass flywheel in which the bearing 14 is supported from a separate axially extending projection 45 which is pre-assembled to input mass 11 by, for example, welding or screwing, prior to the attachment of the twin mass flywheel to the vehicle crankshaft by the bolts which extend through bolt holes 11a. This construction is cheaper to produce and may also save weight.
Claims
1. A twin mass flywheel of the type described which also includes a friction device acting between the masses, this friction device being located between the side plates and including a first friction member which acts between one of the side plates and the flange and a first axially acting spring located between the flange and said one side plate to load the first friction member against the side plate and take up any play between the friction member and the flange, thus tending to control any tipping of the side plates relative to the flange as the flywheel rotates.
2. A twin mass flywheel according to claim 1 in which the friction device also includes further friction members which rotate with the side plates or flange respectively and which are biased axially into frictional engagement by a second axially acting spring also located between the side plates.
3. A twin mass flywheel according to claim 2 in which the further friction members are pressed against the first friction member by the second axially acting spring which provides the main control over the frictional resistance of the device and the first axially acting spring means primarily provides control over the relative tipping of the masses and the level of friction provided by the first friction member.
4. A twin mass flywheel according to claim 2 or 3 in which the first friction member is arranged to operate during all relative rotation between the masses to provide a lower level of friction required at engine idle speeds and the further friction members are arranged to operate progressively at larger angles of relative rotation so that the overall desired friction characteristics of the device are achieved.
5. A twin mass flywheel according to any one of claims 2 to 4 in which the outer peripheries of the side plates remote from the connection with the other mass contact the flange on either side thereof to limit tipping of the masses relative to each other during relative rotation.
6. A twin mass flywheel constructed and arranged substantially as hereinbefore described with reference to and as shown in Figures 1 to 3 or 4 or 5 of the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04742936A EP1716352A1 (en) | 2003-06-18 | 2004-06-17 | Twin mass flywheel |
| GB0524330A GB2417543B (en) | 2003-06-18 | 2004-06-17 | Twin mass fly wheel |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0314084.5 | 2003-06-18 | ||
| GBGB0314084.5A GB0314084D0 (en) | 2003-06-18 | 2003-06-18 | Twin mass flywheels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004113758A1 true WO2004113758A1 (en) | 2004-12-29 |
Family
ID=27636754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB2004/002574 WO2004113758A1 (en) | 2003-06-18 | 2004-06-17 | Twin mass flywheel |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1716352A1 (en) |
| GB (2) | GB0314084D0 (en) |
| WO (1) | WO2004113758A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0228462A1 (en) | 1985-07-11 | 1987-07-15 | WEIGHTMAN, Judy M. | Seat belt cover and cushion |
| US4729465A (en) * | 1983-11-15 | 1988-03-08 | Luk Lamellen Und Kupplungsbau Gmbh | Assembly for compensating for fluctuations of torque which is transmitted by an internal combustion engine |
| US5617940A (en) * | 1994-02-08 | 1997-04-08 | Exedy Corporation | Power transfer apparatus having a vibration dampening mechanism which provides structural support for the apparatus |
| US6209419B1 (en) * | 1995-03-21 | 2001-04-03 | Automotive Products, Plc | Twin mass flywheel friction damping device |
-
2003
- 2003-06-18 GB GBGB0314084.5A patent/GB0314084D0/en not_active Ceased
-
2004
- 2004-06-17 EP EP04742936A patent/EP1716352A1/en not_active Withdrawn
- 2004-06-17 WO PCT/GB2004/002574 patent/WO2004113758A1/en active Application Filing
- 2004-06-17 GB GB0524330A patent/GB2417543B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729465A (en) * | 1983-11-15 | 1988-03-08 | Luk Lamellen Und Kupplungsbau Gmbh | Assembly for compensating for fluctuations of torque which is transmitted by an internal combustion engine |
| EP0228462A1 (en) | 1985-07-11 | 1987-07-15 | WEIGHTMAN, Judy M. | Seat belt cover and cushion |
| US5617940A (en) * | 1994-02-08 | 1997-04-08 | Exedy Corporation | Power transfer apparatus having a vibration dampening mechanism which provides structural support for the apparatus |
| US6209419B1 (en) * | 1995-03-21 | 2001-04-03 | Automotive Products, Plc | Twin mass flywheel friction damping device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0524330D0 (en) | 2006-01-04 |
| GB2417543A (en) | 2006-03-01 |
| EP1716352A1 (en) | 2006-11-02 |
| GB2417543B (en) | 2006-08-16 |
| GB0314084D0 (en) | 2003-07-23 |
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