EP1133644A2 - Embrayage a friction - Google Patents

Embrayage a friction

Info

Publication number
EP1133644A2
EP1133644A2 EP99973319A EP99973319A EP1133644A2 EP 1133644 A2 EP1133644 A2 EP 1133644A2 EP 99973319 A EP99973319 A EP 99973319A EP 99973319 A EP99973319 A EP 99973319A EP 1133644 A2 EP1133644 A2 EP 1133644A2
Authority
EP
European Patent Office
Prior art keywords
plate
clutch
spring
friction clutch
pin
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Withdrawn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
EP99973319A
Other languages
German (de)
English (en)
Inventor
Alastair John Young
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 Group Ltd
Original Assignee
Whitnash 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 Whitnash PLC filed Critical Whitnash PLC
Publication of EP1133644A2 publication Critical patent/EP1133644A2/fr
Withdrawn legal-status Critical Current

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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00—Friction clutches
    • F16D13/58—Details
    • F16D13/75—Features relating to adjustment, e.g. slack adjusters
    • F16D13/757—Features relating to adjustment, e.g. slack adjusters the adjusting device being located on or inside the clutch cover, e.g. acting on the diaphragm or on the pressure plate
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D13/00—Friction clutches
    • F16D13/58—Details
    • F16D13/70—Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members
    • F16D2013/706—Pressure members, e.g. pressure plates, for clutch-plates or lamellae; Guiding arrangements for pressure members the axially movable pressure plate is supported by leaf springs

Definitions

  • the present invention relates to friction clutches and in particular to self adjusting friction
  • Friction clutches which comprise a clutch cover attached to a flywheel with at least
  • a pressure plate acting on a pressure plate to force a driven plate into frictional engagement with a counter pressure plate which may be a flywheel.
  • Friction clutches are also known which comprise a constant lift device for maintaining the lift of the pressure plate during clutch disengagement substantially constant during the life of the driven plate.
  • a friction clutch comprising a clutch cover attached to a flywheel with at least one spring acting on a pressure plate to force a
  • pivotal mounting of the locking plate comprises a pivot member engaging in a slot
  • resilient means is provided between the pivot member and a first surface of the slot to bias the pivot member against a second surface of the slot opposite from the first
  • the resilient means may comprise a resiliently deformed portion of a plate-like member
  • the spring means of the constant lift device comprises a plate-like spring, in which case the plate-like member can be an integral part of the plate-like spring.
  • the plate-like spring of the constant lift device may comprise a plate-like section having a hole through which the pin extends and a substantially U-shaped tab at one end of the plate-like section which tab biases the locking plate such that the locking plate tilts relative to the pin to grip the pin, in which a portion of the plate-like section remote from the U-shaped
  • the spring means of the constant lift device may be a coil spring
  • the friction clutch further comprises an adjustment device for automatically compensating for wear of the friction surfaces of the clutch
  • Figure 1 is an axial partly cutaway view of a clutch assembly according to the present invention
  • Figure 2 is an enlarged view of part of Figure 1 ,
  • Figure 3 is a radial view taken from the direction of arrow W of Figure 1 including a flywheel,
  • Figure 4 is a partial cross section view of the clutch cover assembly of Figure 1 and associated driven plate and flywheel taken along the line XX of Figure 1,
  • Figure 5 is a view taken along line Y-Y of Figure 1 with components 60, 53 and 59 shown
  • Figure 6 is an isometric view of the spring 53 of Figure 5
  • Figure 7 is a partial cross sectional view taken along line Y-Y of Figure 1 but showing a modified form of constant lift device according to the invention
  • Figure 8 is an isometric view of plate 190 in Figure 7, and
  • Figure 9 is a view of a further form of a constant lift mechanism according to the invention.
  • a clutch 10 which includes a flywheel 1 1, a
  • the flywheel 11 is fixed to the end of a crankshaft (not shown) of an associated internal combustion engine.
  • the clutch is an automatically adjusting clutch but it will be understood that the invention is not limited to application on friction clutches having automatic adjusting devices to compensate for wear.
  • the clutch cover assembly 20 comprises a clutch cover 21, a diaphragm spring 12, a pressure plate 13, lift straps 14, one adjuster means 44 and three constant lift devices 49 each
  • the clutch cover 21 is fixed rotationally and axially fast to the flywheel 11 by bolts (not shown) and supports the diaphragm spring 12 via two support rings 22 situated one on each axial side of the diaphragm spring 12 in a manner well known in the art.
  • the diaphragm spring biases the pressure plate 13 towards the flywheel 11.
  • the clutch driven plate 15 is situated between the pressure plate 13 and flywheel 11 and is connected to the input shaft of a gear box (not shown).
  • the pressure plate 13 comprises a first part 30 coaxial with a second part in the form of a pivot ring 40
  • First part 30 is generally annular in shape and has significant thermal mass and
  • the radially outer periphery of the first part 30 there are three circumferentially equi-spaced lugs 31 Each lug is fixed to one end 14A of a tangentially orientated lift strap 14 by a rivet 17
  • the other end 14B of the strap 14 is fixed to the clutch cover 21 by a rivet 19
  • the straps 14 ensure the first part 30 remains concentric with and rotationally fast with the clutch cover 21 but allow axial movement of the first part 30 relative to the clutch cover 21 When the clutch is engaged the straps 14 are stressed and bias the first part 30 away from the flywheel This biasing assists in separating the first part 30 from the driven plate 15 when the clutch is
  • Adjuster means 44 comprises a pawl means having pawl teeth 41 which engage an array of helical adjuster teeth 42 carried on the pivot ring 40 of the pressure plate 13
  • the pawl means 44 comprises a pawl means having pawl teeth 41 which engage an array of helical adjuster teeth 42 carried on the pivot ring 40 of the pressure plate 13
  • the pawl means 44 comprises a pawl means having pawl teeth 41 which engage an array of helical adjuster teeth 42 carried on the pivot ring 40 of the pressure plate 13
  • the pawl means 44 comprises a pawl means having pawl teeth 41 which engage an array of helical adjuster teeth 42 carried on the pivot ring 40 of the pressure plate 13
  • the pawl means 44 comprises a pawl means having pawl teeth 41 which engage an array of helical adjuster teeth 42 carried on the pivot ring 40 of the pressure plate 13
  • the pawl means 44 comprises a pawl means having pawl teeth 41 which engage an array of helical adjuster teeth 42
  • the first and second parts of the pressure plate have facing ramps 45 and as relative rotation occurs the effective thickness of the pressure plate 13 increases to compensate for the reduction in thickness of the driven plate f ⁇ ction facings 16
  • Each constant lift device 49 is attached to an associated lug 31 of first part 30 of the pressure plate 13 Since all the constant lift mechanisms 49 identical only one will be described in detail
  • the constant lift device 49 comprises a constant lift mechanism (see Figure 5) having an adjustment pin 51, a locking plate 60, a locking spring 53, an adjusting spring 54 and a washer 55 (in Figure 5 components 53, 59 and 60 have been rotated through 90 degrees for ease of
  • Adjustment pin 51 comprises a shank portion 51 A and a head portion 5 IB with a domed abutment surface 51C.
  • Spring 53 has a central hole 53 A which is a clearance fit on the adjustment pin 51 and also has a tab 66 bent through approximately 180 degrees in the shape of a "U" It is the resilience of
  • Locking plate 60 is mounted via a central hole 63 on adjustment pin 51 and is of generally
  • pivot member pivot member 62 remote from tab 61 is situated in a slot 59 of first part 30 of the pressure plate 13 This causes the locking plate 60 to tip sufficiently such that the edges 64 of the locking plate 60 contact the pin 51
  • the adjustment pin 51 is mounted in a hole 70 of a tab 32 with head 5 IB positioned on the side of tab 32 remote from the flywheel Tab 32 is secured to a first part 30 of the pressure plate 13 by a rivet 17 Situated between the head 51 B and the hole 70 is a spring 54 which is retained on the adjustment pin 51 by a washer 55 Spring 54 is tensioned such that it biases the
  • the frictional contact between the pin 51 and the edges 64 of the locking plate 60 will tend to move the locking plate 60 axially to take up the free play before pivoting it against the spring 53. If this happens then the pin 51 will not move relative to the locking plate 60 or at least will not move sufficiently to fully compensate for the wear of the friction surfaces 16 and correct adjustment of the device 49 will not occur.
  • the spring 53 remote from the U-shaped tab 66 has been deformed to produce a resilient portion 53 C, as can best be seen in Figure 6.
  • the resilient portion 53 C is located between the
  • tab 62 of the locking plate 60 and the tab 32 acts to bias the tab 62 towards a surface 59A of the slot 59 opposite from the tab 32.
  • the resilient biasing of the tab 62 need not be provided by means of a resilient portion on the spring 53, and any other suitable means for biasing the tab 62 in the slot 59 could be used.
  • the resilient biasing could be provided by a spring means which is separate from the
  • spring 53 such as an elastomeric spring. Also, it is not essential to the invention that the tab 62 be biased towards the surface 59 A of the slot 59. As an alternative, means could be provided
  • Figures 7 and 8 show a modified version 149 of the constant lift device 49 with features that fulfil the same function as those in constant lift mechanism 49 being labelled one hundred greater, significant differences are as follows:
  • a) spring 153 is a coil spring which extends between the tab 161 of the locking plate 160 and a tongue 181 of the lever 180.
  • a tang 181 A is provided on the tongue 181
  • tab or pivot member 162 of locking plate 160 is pivotally received in a slot 132A of a plate 132 which is connected to the fist part 130 of the pressure plate;
  • a plate 190 (see Figure 8) is provided between the plate 132 and the tab 162.
  • the plate 190 is deformed to provide a resilient portion 191 which biases the tag 162 towards the surface 132B of the slot 132 A;
  • the head portion 15 IB of the pin 151 is of diameter substantially equal to the
  • FIG. 9 shows a further embodiment of a constant lift device the operation of which is described in detail in the applicant's co-pending application WO 98/41777 to which the reader is refe ⁇ ed.
  • the constant lift device 249 has been modified in a manner similar to that of device 49 in that the spring 253 has been deformed at an end portion

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Operated Clutches (AREA)

Abstract

Cet embrayage à friction comprend un couvercle d'embrayage (21) solidaire d'un volant pourvu d'au moins un ressort agissant sur un plateau de pression (13) de façon à pousser un plateau mené à entrer en contact de friction avec le volant. L'embrayage comporte au moins un dispositif à soulèvement constant (49, Fig. 1) qui limite le soulèvement du plateau de pression à une valeur sensiblement constante pendant chaque débrayage complet. Le dispositif à soulèvement constant est du type comprenant un plateau de frein (60) monté pivotant sur un organe de détection d'usure, le plateau de pression (13) ou un composant fixé axialement de l'embrayage (132, Fig 7). Le plateau de frein (60) comporte un perçage (63) traversé d'une broche (51). Un organe à ressort (53) agit de façon à incliner le plateau de frein par rapport à la broche jusqu'à serrer la broche pour interdire le déplacement axial de la broche par rapport au plateau de frein dans un sens au moins. L'ensemble comporte un organe résilient (53C, Fig. 6) visant à éliminer ou réduire le jeu libre dans le montage pivotant du plateau de frein. Cet embrayage à friction peut constituer un embrayage à reprise automatique de jeu.
EP99973319A 1998-12-04 1999-11-22 Embrayage a friction Withdrawn EP1133644A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9826631 1998-12-04
GBGB9826631.5A GB9826631D0 (en) 1998-12-04 1998-12-04 Friction clutch
PCT/GB1999/003869 WO2000034675A2 (fr) 1998-12-04 1999-11-22 Embrayage à friction

Publications (1)

Publication Number Publication Date
EP1133644A2 true EP1133644A2 (fr) 2001-09-19

Family

ID=10843612

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99973319A Withdrawn EP1133644A2 (fr) 1998-12-04 1999-11-22 Embrayage a friction

Country Status (4)

Country Link
EP (1) EP1133644A2 (fr)
AU (1) AU1395700A (fr)
GB (2) GB9826631D0 (fr)
WO (1) WO2000034675A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201915165D0 (en) * 2019-10-18 2019-12-04 Ap Automotive Products Srl Vehicle clutches

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2599446B1 (fr) * 1986-06-03 1988-08-05 Valeo Embrayage a friction a rattrapage d'usure continu
GB9518991D0 (en) 1995-09-16 1995-11-15 Automotive Products Plc Automatically adjusting clutch
GB9705443D0 (en) * 1997-03-15 1997-04-30 Automotive Products Plc Friction clutches

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0034675A2 *

Also Published As

Publication number Publication date
WO2000034675A2 (fr) 2000-06-15
WO2000034675A3 (fr) 2000-11-16
AU1395700A (en) 2000-06-26
GB9826631D0 (en) 1999-01-27
GB2369414A (en) 2002-05-29
GB2369414B (en) 2003-04-16
GB0112864D0 (en) 2001-07-18

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