GB2149059A - Torsional vibration damper for clutch plates - Google Patents

Torsional vibration damper for clutch plates Download PDF

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Publication number
GB2149059A
GB2149059A GB08322252A GB8322252A GB2149059A GB 2149059 A GB2149059 A GB 2149059A GB 08322252 A GB08322252 A GB 08322252A GB 8322252 A GB8322252 A GB 8322252A GB 2149059 A GB2149059 A GB 2149059A
Authority
GB
United Kingdom
Prior art keywords
spring
window
low friction
windows
friction
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.)
Granted
Application number
GB08322252A
Other versions
GB2149059B (en
GB8322252D0 (en
Inventor
Colin Reginald Draper
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 GB08322252A priority Critical patent/GB2149059B/en
Publication of GB8322252D0 publication Critical patent/GB8322252D0/en
Publication of GB2149059A publication Critical patent/GB2149059A/en
Application granted granted Critical
Publication of GB2149059B publication Critical patent/GB2149059B/en
Expired 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
    • F16F1/00—Springs
    • F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
    • F16F1/024—Covers or coatings therefor
    • 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
    • F16F15/121—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 using springs as elastic members, e.g. metallic springs
    • F16F15/123—Wound springs
    • F16F15/12313—Wound springs characterised by the dimension or shape of spring-containing windows
    • 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
    • F16F15/121—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 using springs as elastic members, e.g. metallic springs
    • F16F15/123—Wound springs
    • F16F15/1232—Wound springs characterised by the spring mounting

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

A torsional vibration damper, particularly for use in a friction clutch driven plate incorporates the usual coil springs 23 arranged in windows 19, 21, 22, respectively in side plates 15 and 16 of a driving member and flange 13 of a driven member. Each spring 23 is provided with a coating 28 of low friction wear resistant material such as nylon. It has been found that by positively introducing low friction between the springs and windows the friction damping achieved within the driven plate, particularly at high rotational speeds, is more predictable for any individual driven plate. <IMAGE>

Description

SPECIFICATION Torsional vibration dampers The invention relates to torsional vibration dampers as used in clutch driven plates. A typical clutch driven plate is shown in UK patent specification 1 257 61 lA A pair of side plates are driven by friction facing carriers and transmit torque to a flanged hub through helical springs arranged in apertures in the side plates and hub flange.
It is also common to introduce a pre-determined amount of frictional damping between the hub and the side plates but in order to set this friction damping accurately in mass-production it is important to avoid substantial spurious friction. When a friction clutch driven plate is rotating at substantial speed, centrifugal force acts on the springs and presses them firmly into engagement with the outer edge of at least one window. Normally the spring engages angled spring retainers bent out from the material of the side plates at the outer edges thereof. This engagement between springs and outer edges of windows can give rise to substantial friction which alters the damping characteristics of the torsional vibration damper in relation to rotational speed in an unpredictable manner.
An object of the present invention is to provide a torsional vibration damper in which this problem is diminished.
According to one aspect of the invention there is provided a torsional vibration damper comprising at least one side plate, a flanged hub and circumferentially directed helical coil springs arranged in windows in the side plate and hub flange for transmitting drive between the side plate and the hub, wherein said springs or at least one of the windows associated with each spring has a coating of a low friction material. This coating serves to reduce friction between the springs and the windows and enables the overall friction in the torsional vibration damper to be controlled more accu rately from one item to the next in a massproduction situation. Preferably the low fric tion coating is of a hard plastics material such as hard nylon or PTFE. The coating may incorporate a low friction additive such as molybdenum disulphide.
According to a second aspect of the invention there is provided a friction clutch driven plate comprising a driving member and a driven member arranged to be capable of limited relative angular rotation, at least one circumferentially directed helical coil spring arranged in a window of the driving member and a window of the driven member to estab lish a driving connection through the spring between the members, wherein the spring or the windows associated therewith are coated with a low friction plastics material whereby low friction is achieved between the spring and the windows.
According to a third aspect of the present invention there is provided a friction clutch driven plate comprising a driving member and a driven member arranged to be capable of limited relative angular rotation, at least one circumferentially directed helical coil spring arranged in a window of the driving member and a window of the driven member to establish a driving connection through the spring between the members, wherein the spring or the windows associated therewith are coated with a low friction plastics material whereby low friction is achieved between the spring and at least one of the windows and wherein either the free length of the spring along its own axis, including any coating on the end thereof, is less than the free length of either window or the free length of the spring itself without its coating along its own axis is greater than the length of at least one of the windows.
An embodiment of the invention will be described with reference to the accompanying drawings in which: Figure 1 is an end elevation of a friction clutch driven plate incorporating a torsional vibration damper; Figure 2 is a section on line ll-ll of Fig. 1; and Figure 3 is a section on line Ill-Ill of Fig. 1 on a larger scale, showing only the helical coil spring.
The friction clutch driven plate shown in the drawings incorporates a hub 11 having internal splines 1 2 for establishment of a driving connection to a gearbox input shaft (not shown). Hub 11 has an integral outwardly extending radial flange 1 3.
A friction facing carrier 1 4 is constituted primarily by two side plates 1 5 and 1 6 joined together by rivets 1 7. Side plates 1 5 and 16 are positioned one to each side of the flange 1 3 and are guided by the hub 11 for angular movement with respect to the hub about the hub axis. Rivets 1 7 pass through recesses 1 8 in the outer edge of the hub 1 3 with a clearance in such a way that the rivets 1 7 act as stop pins to restrict the angular movement between the hub and the carrier 14.
The side plates 1 5 and 1 6 and also the hub 1 3 are provided with aligned openings known as windows as shown at 19, 21 and 22. A steel coil spring 23 is arranged in each set of aligned windows with its axis running in a circumferential direction with respect to the hub axis. Windows 19 and 21 have spring retainers 24 and 25 bent out from the material of the side plates at the edges of the windows.
Side plate 1 5 carries a series of spring segments 20 which in turn carry two annular friction facings 26 and 27. As thus far de scribed, the driven plate is entirely conven tional and corresponds with that described in UK patent specification 1 257 611 A. In use, torque applied to the friction facings is transmitted to the hub through the springs 23 which allow resilient angular deflection between the hub and the friction facing carrier and thus tend to damp torsional vibrations in the drive through the clutch driven plate. It is of course the springs 23 acting in the windows 19, 21 and 22 of side plates 1 5 and 1 6 and hub flange 1 3 which act as a torsional vibration damper.During axial compression of the springs 23 associated with angular deflection between the hub and the friction facing carrier, there is a tendency for springs 23 to rub against the edges of the windows as these springs are compressed. Particularly when the clutch driven plate is rotating at speed, for example 4000 rpm, centrifugal force acting on the springs forces them in an outward direction into firm engagement with the outer spring retainers 24 and 25. The result is significant frictional resistance to relative rotation between the hub and carrier due to friction between the springs and their retainers. This friction can interfere with correct operation of the torsional vibration damper so it is desirable to reduce or eliminate this friction.
In accordance with the present invention, each spring is coated with a layer of hard, low friction, wear resistant material such as hard nylon or PTFE, possibly containing a low friction additive such as molybdenum disulphide. A spring 23 together with its coating 28 is shown in Fig. 3. In a typical application the springs are dry coated to a thickness of approximately 0.30 mm.
It has been discovered that the provision of the low friction coating on the springs significantly reduces the hysteresis which arises in the clutch driven plate, particularly when the driven plate is rotating at high speed.
As an alternative to applying the coating to the springs themselves, the coating could be applied to the side plates 1 5 and 16 or at least to the inner surfaces of the spring retainers 24 and 25 of the side plates.

Claims (7)

1. A torsional vibration damper comprising at least one side plate, a flanged hub and circumferentially directed helical coil springs arranged in windows in the side plate and hub flange for transmitting drive between the side plate and the hub, wherein said springs or at least one of the windows associated with each spring has a coating of a low friction material.
2. A friction clutch driven plate comprising a driving member and a driven member arranged to be capable of limited relative angular rotation, at least one circumferentially directed helical coil spring arranged in a window of the driving member and a window of the driven member to establish a driving connection through the spring between the members, wherein the spring or the windows associated therewith are coated with a low friction plastics material whereby low friction is achieved between each spring and at least one window.
3. A friction clutch driven plate comprising a driving member and a driven member arranged to be capable of limited relative angular rotation, at least one circumferentially directed helical coil spring arranged in a window of the driving member and a window of the driven member to establish a driving connection through the spring between the members, wherein the spring or the windows associated therewith are coated with a low friction plastics material whereby low friction is achieved between the spring and the windows and wherein either the free length of the spring along its own axis including any coating on the end thereof is less than the free length of either window or the free length of the spring itself without its coating along its own axis is greater than the length of a window in at least one of the members.
4. A device as claimed in any one of the preceding claims wherein the coating material is hard nylon.
5. A device as claimed in any one of claims 1 to 3 wherein the coating material is PTFE.
6. A device as claimed in claim 4 or claim 5 wherein the material includes a low friction additive such as molybdenum disulphide.
7. A friction clutch driven plate substantially as described with reference to and as illustrated by the accompanying drawings.
GB08322252A 1983-08-18 1983-08-18 Torsional vibration damper for clutch plates Expired GB2149059B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08322252A GB2149059B (en) 1983-08-18 1983-08-18 Torsional vibration damper for clutch plates

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08322252A GB2149059B (en) 1983-08-18 1983-08-18 Torsional vibration damper for clutch plates

Publications (3)

Publication Number Publication Date
GB8322252D0 GB8322252D0 (en) 1983-09-21
GB2149059A true GB2149059A (en) 1985-06-05
GB2149059B GB2149059B (en) 1986-12-17

Family

ID=10547495

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08322252A Expired GB2149059B (en) 1983-08-18 1983-08-18 Torsional vibration damper for clutch plates

Country Status (1)

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GB (1) GB2149059B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179424A (en) * 1985-08-08 1987-03-04 Fichtel & Sachs Ag Torsional vibration damper
FR2699631A1 (en) * 1992-12-17 1994-06-24 Valeo Torsional damper for motor vehicle drives
WO1996037713A1 (en) * 1995-05-23 1996-11-28 Ina Wälzlager Schaeffler Kg Vehicle clutch release unit pressure spring
GB2427375B (en) * 2003-05-22 2007-12-19 Westwind Air Bearings Ltd Rotary tool holder assemblies
DE102018215114A1 (en) * 2018-09-06 2020-03-12 Zf Friedrichshafen Ag Device for damping torsional vibrations in a drive train

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2179424A (en) * 1985-08-08 1987-03-04 Fichtel & Sachs Ag Torsional vibration damper
US4810231A (en) * 1985-08-08 1989-03-07 Fichtel & Sachs Ag Torsional vibration damper having springs with progressive characteristics
GB2179424B (en) * 1985-08-08 1989-11-15 Fichtel & Sachs Ag Torsional vibration damper
FR2699631A1 (en) * 1992-12-17 1994-06-24 Valeo Torsional damper for motor vehicle drives
WO1996037713A1 (en) * 1995-05-23 1996-11-28 Ina Wälzlager Schaeffler Kg Vehicle clutch release unit pressure spring
DE19581664C1 (en) * 1995-05-23 2002-03-14 Luk Lamellen & Kupplungsbau Spring assembly for a vehicle clutch
GB2427375B (en) * 2003-05-22 2007-12-19 Westwind Air Bearings Ltd Rotary tool holder assemblies
DE102018215114A1 (en) * 2018-09-06 2020-03-12 Zf Friedrichshafen Ag Device for damping torsional vibrations in a drive train
WO2020049035A1 (en) 2018-09-06 2020-03-12 Zf Friedrichshafen Ag Device for reducing torsional vibrations in a drive train

Also Published As

Publication number Publication date
GB2149059B (en) 1986-12-17
GB8322252D0 (en) 1983-09-21

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PCNP Patent ceased through non-payment of renewal fee