FR2563298A1 - FRICTION CLUTCH HAVING A REMOVABLE LOCKING ASSEMBLY MEMBER - Google Patents

Abstract

IN THIS CLUTCH, TO SIMPLIFY THE ASSEMBLY DURING THE INSTALLATION OF THE GEARBOX ON THE ENGINE, THE ASSEMBLY BODY CONNECTING THE RELEASE STOP TO THE DIAPHRAGM SPRING INCLUDES A JOINT RING OF THE TONGS OF THE QUIAPHRAGM SPRING INTERNAL THROAT 19 IN WHICH SHOULDER SHOULDERS 16 SHAPED ON ELASTIC TABS 13 OF A TUBULAR ELEMENT 12 JOINT TO THE RELEASE STOP. A FERRULE 20 MOUNTED WITH RADIAL AND AXIAL CLEARANCE IN THIS FORGE CAN FIT ON THE CONICAL SHOULDERS 16 OF THE ELASTIC TABS 13 WHEN THESE LATTERS ARE ENGAGED FULLY IN THE RING 17, AND KEEP THEM THUS TIGHTENED SO THAT WE CAN EXTRACT THESE TEETH OF RING 17 WITHOUT ANY TOOL.

Description

i

  FRICTION CLUTCH EQUIPPED WITH A MEMBER

  DETACHABLE ASSEMBLY WITH LATCHING

  The invention relates to an equal friction clutch.

  pe of a removable snap-in assembly member

  cé in the declutching device and intended to simplify the assembly during the assembly of the engine and the gearbox, this assembly member comprising, inter alia, a tubular element located on the gearbox side and provided with elastic tabs directed towards the clutch and which terminate in an external cone, the

  outer cone ending in a circumferential shoulder

  tiel divided by longitudinal slits and which in the

  fitting movement, hooks behind a counter

  shoulder formed in an inner groove of a ring if-

  killed on the clutch side, to transmit the movement

  clutch operated by traction.

  Clutches fitted with a declutching device

  yage pulled or operating by pull are increasingly

  widely used. Here, the expression "debraking device

  yage drawn "means that, for the clutch release movement, the clutch release bearing moves in the direction away from the clutch and approaches the gearbox. However, during engine assembly and from the box

  gear, it is necessary to hang the

  clutch behind the clutch release elements.

  So that this mounting operation can be carried out

  in a simple way, we must take special measures

  lières. This is how it is known, for example, by the

  German patent application 26 13 952, to provide the device

  clutch release on the gearbox side of an

  tubular ment which has elastic tongues which, oriented lengthwise, have an outer cone at their end directed towards the clutch, this outer cone ending at the right of its large diameter by circumferential shoulder. When assembling the gearbox and the motor, the tubular element is introduced, together with the input shaft of the gearbox

- 2563298

  with the clutch release bearing, through the

  greening of the inner ring of a clutch release bearing, the elastic tabs then tightening under the action

  conical surfaces and thus able to hang behind-

  re the inner ring. The operation of separating this snap-fit assembly member is made possible by the fact that the tubular element has a cut between the clutch release bearing and the gearbox. Of

  this way, when disassembly is carried out after the

  the front part of the tubular element remains retained

  in the clutch release bearing, with its elastic tabs.

  The object of the present invention is, to produce in a friction clutch with a released clutch device, a snap-on assembly member which is such that,

  not only, the assembly of the engine and the gearbox

  braids are facilitated but that disassembly is done all

  as easily without a part of the assembly organ

  snap-in wiring must not remain in the other part.

  According to the invention, this problem is solved by the fact that the internal groove is widened towards the clutch that, in this groove, is arranged a ferrule mounted with clearance in the axial and radial directions, this ferrule being pressed against a shoulder located at some

  distance from the shoulder, having an internal diameter

  laughing equal to or less than the inside diameter of the counter

  shoulder of the ring, and having a greater length

  re to the axial dimension of the outer cone, while the

  axial dimension of the inner groove is at least slight

  much greater than the sum of the length of the sleeve

  and that of the outer cone, measured from the front end

  holds elastic tabs up to the shoulder. Thanks

  the arrangement of a ferrule mounted with clearance in the directions

  axially and radially in the enlarged inner groove, it is possible to carry out the separation operation in a very simple manner. For this, the tubular element fitted with the elastic tabs is pressed more deeply into the ring on the clutch side, in the mounting direction, that is to say in the direction opposite to the disengagement direction, so

  that the elastic tabs slide by their external cone

  laughing in the inside diameter of the sleeve, so that, in the following movement of elastic tongues in the direction of disengagement, the ferrule can slide with the elastic tongues up to the shoulder of the ring, so that it is possible to the elastic tabs to cross the shoulder against sliding and, of this

  way, to move away from the ring in the direction of disengaging.

  In this way, the snap-fit assembly member is

  again disassembled in a very simple way. The only pre-

  caution to take is to ensure that at the time of a

  new mounting operation, the ferrule is pressed against

  be the shoulder facing the counter shoulder.

  According to another characteristic of the invention, this shoulder is formed by an elastic stop ring embedded in the ring. Furthermore, it is advantageous

  to give the elastic stop ring an internal diameter

  smaller than the diameter of the outer cone located on the front surface of the elastic tongues when these tongues are engaged in the shell. In this way,

  the elastic stop ring also serves as an axial stop

  the for the elastic tabs when the latter are moved in the opposite direction to the declutching direction for

  begin disassembly of the snap clutch

  floor. The invention is described more precisely

  below with reference to an exemplary embodiment shown

felt on the attached drawing:

  Figure 1 is a longitudinal sectional view for-

  mant a block diagram of a friction clutch; Figures 2 and 3 are more representations

  large-scale parts of the assembly member to

  clicking. FIG. I very generally represents a friction clutch (1) interposed between an internal combustion engine not shown and a gearbox not shown. The friction clutch (1) is part of a flywheel (4) which is rotatably connected to the crankshaft (8). The friction clutch (1) is partially surrounded by the fixed casing (5) integral with the engine. Following the motor casing (5), the gearbox casing (6) extends, most of the elements of the declutching device being arranged in the

  fixed gearbox housing. Starting from the embra-

  friction yage (1), extends in a position centered on

  this clutch, the input shaft (7) of the gearbox.

  Around the input shaft (7) of the gearbox is disposed the clutch release bearing (3) which is connected, by means of the clutch release fork (9) and a linkage (10), the clutch pedal mounted in the vehicle. In response to a movement of the clutch release lever (9), clockwise, there is a movement of the clutch release bearing (3) in

  the direction of the arrow (F), so that the friction clutch

  tion (1) is disengaged. In response to movement of the four-

  clutch release lever (9) in the opposite direction to the direction of the

  those of a watch, there is a movement of the clutch release bearing (3) in the direction of the arrow (G), so that the friction clutch (1) is disengaged. This movement

  is transmitted from the clutch release bearing (3) to the spring

  phragm (11) of the friction clutch (1) via

  diary of a snap-fit assembly member designated as a whole by (2). It is entirely possible to provide release levers to replace the spring

diaphragm (11).

  The snap-fit assembly member (2) is

  presented enlarged in Figures 2 and 3 and described with more precision with regard to these figures, considered in combination with Figure 1. Figure 2 is a section

  longitudinal of the latching assembly member (2).

  This assembly member is composed of a tubular element

  (12) which is fixedly mounted in the axial position in the device

  positive clutch release (3) in a manner which is not described in detail. The tubular element (12) has several elastic tabs (13) distributed around its circumference and which are separated from each other by slots

  longitudinal (14). the elastic tabs (13) extend

  tooth towards the friction clutch (1), i.e. in the

  direction of arrow (F). In the service position shown

  felt in Figure 2, the elastic tabs (13) are

  hooked by a shoulder (16) behind a counter

  shoulder (18) formed on a ring (17) which is connected

  in solidarity, at least in the axial direction, at the lan-

  diaphragm spring guards (11). These two shoulders (16) and (18) transmit the declutching force from the declutching member (6) to the diaphragm spring (11) in the direction of the arrow (G). The mode of assembly and disassembly of 1 '

  snap-fit assembly member (2) is described with reference

  Refer to FIG. 3. FIG. 3 is an enlarged representation of the snap-on assembly member (2) according to FIG. 2. The elastic tongue (13) has, in its terminal region, an external cSne (11) which begins with a diameter (E) at the front end (22) and has a

  increase in diameter in the direction of the arrow (G).

  This increase in diameter ends at the right of the

  shoulder (16), where the elastic tabs (13) are oar-

  born at a diameter less than the maximum diameter of the external cSne (15). The end region of each elastic tongue (13) has an axial dimension indicated by

  (AT). This dimension extends from the front end to

  than at the shoulder (16). the conjugate part of the elastic tongues (13) is constituted by a ring (17). This

  ring has an inner cone (24) in its direct region

  to the gearbox. This inner cone shrinks

  cit in the direction indicated by the arrow (F) up to a

  value which corresponds to the inside diameter (D). At the re-

  inner diameter region (D), follows a counter

  shoulder (18) which represents an axial limit of a groove

  inner age (19). This inner groove (19) has

  a diameter greater than the diameter (D). During the assembly

  of the gearbox and the engine, the annular element (12) is advanced, with its elastic tabs

  (13) forward, towards the ring (17). Since the ba-

  gue (17) is secured to the diaphragm spring (11), the elastic tabs (13) can slide by their outer cone (15) against the inner cone (24) of the ring (17) by tightening radially inward

  and undergoing elastic deformation.

  As soon as the shoulder (16) of the elasticated tabs

  ques (13) is engaged behind the counter-shoulder (18) of the

  inner groove (19), the elastic tabs (13) represent

  suddenly come radially outward and per-

  so put to get a force transmission in the

  direction of arrow (G), via the two surfaces

  these annulars respectively delimited by the shoulder (16) and by the counter-shoulder (18). The annular surface delimited by the shoulder (16) is interrupted by the longitudinal slots (14). FIG. 3 also shows the elements which make it possible, in a simple manner,

  disassembly of the snap-on assembly member (2).

  For this purpose, the internal groove (19) is widened in the direction of the arrow (F) and it has, parallel to the counter shoulder (18), a shoulder (21) which is formed by an elastic stop ring. (23). In the axial region between the front end (22) of the elastic tongues (13) and the shoulder (21) of the stop ring

  elastic (23), a ferrule (20) is arranged which is

  with a small radial clearance relative to the internal groove

  (19) and which has an internal diameter (d).

  This ferrule is therefore mounted with clearance in the position of

  operation of the snap-fit assembly member (2).

  The longitudinal dimension of the elements according to FIGS. 2 and 3 is calculated so that the total length of the internal groove (19) is equal to the dimension (L), that the axial dimension of the ferrule (20) is equal to the dimension (B)

  and that the elastic tabs (13) have the dimension

  sion (A) between the front end (22) and the shoulder 2s $ 3298 (16). For the snap-fit assembly member (2) to function flawlessly, it is necessary that the dimension (L) be at least slightly greater than the sum of the dimensions (A) and (B). This ensures that the ferrule (20) is mounted with clearance in the axial direction in the operating position of the snap-fit assembly member.

  floor (2). To disassemble the snap-fit assembly

  stage (2), the tubular element (12) is pushed deeper

  in the ring (17), with the elastic tongues (13) forward, in the direction of the arrow (F), that is to say

  in the direction of the initial assembly. In this movement, the lan-

  elastic lookouts (13) sink, slide by their

  outer cone (15), up to the bore of internal diameter

  laughing (d) of the ferrule (20). This fitting movement can advantageously be limited exactly by the fact that the elastic tongues (13) come into contact, through their front end (22), with the shoulder (21) of the elastic stop ring (23). For this purpose, in the state

  mounted, the elastic stop ring (23) has a diameter

  be inner (C) which is smaller than the diameter (E) of the outer cone (15) in line with the front surface (22), in the position where the elastic tabs (13) are fitted into the ferrule (20). After the front ends (22) come into abutment against the shoulder (21), the tubular element (12) is removed in the direction of the arrow (G), that is to say in the direction of disengagement. The elastic tabs (13) tightened in the inside diameter (d) of the sleeve (20) drive the ferrule (20) with them in

  the direction of the arrow (G). Thanks to the fact that the diameter

  (d) of the ferrule (20) is equal to or less than the

  inner diameter (D) of the ring (17), at the level of the former

  inner end of the inner cone (24), diameter which also delimits the counter-shoulder (18) inwards,

  it is now possible, during the extraction movement

  tion in the direction of the arrow (G) and after arrival of the ferrule (20) in abutment against the shoulder (18) of the ring (17) to extract the elastic tabs (13)

  through the opening (D) of the ring (17). Then, inside

  tieur throat (19), the ferrule (20) is pressed against the shoulder (18). During the next reassembly, the ferrule (20) is again brought into contact with the shoulder (21), according to FIG. 3. If (d) is smaller than (D) the ferrule (20) is automatically pushed into the

  direction of the arrow (F) by the external c8ne (15) of the lans

  elastic lookouts (13) and, in this way, the access space

  spitting is released. It goes without saying that in the position

  substantially relaxed shown in Figure 3, the diameter

  tre (E) measured at the front end (22) of the tongues

  elastic (13) must be smaller than the internal diameter

laughing (d) of the ferrule (20).

  The fact that the ferrule (20) is disposed in an internal groove (19) of appropriate width, therefore provides the possibility of separating the assembly member from

  snap-on (2) in a simple way and without any tools.

  We can proceed to a new assembly operation too-

  soon after the decoupling operation.

Claims (3)

  1- Friction clutch fitted with an as-   removable snap fitting arranged in the arrangement   declutching device and intended to simplify assembly at the mo-   ment of the engine and gearbox assembly,   this assembly member comprising, inter alia, an element   tubular located on the gearbox side and provided with elastic tongues directed towards the clutch and which terminate in an outer cone, the outer cone itself terminating in a circumferential shoulder divided by longitudinal slots and which during the fitting movement is hooked behind a shoulder formed in an inner groove of a ring located on the clutch side, to transmit the clutch movement   operating in traction, characterized in that the internal groove   upper (19) is widened towards the clutch (arrow F), in that, in this groove (19) is arranged a ferrule (20) mounted with play in the axial and radial directions, this ferrule being pressed against a shoulder ( 21) located   at a certain distance from the counter-shoulder (18), poss-   with an internal diameter (d) equal to or less than the diameter   inner meter (D) of the ring shoulder (18)   (17), and having a length (B) greater than the dimension   axial dimension of the outer cone (15), while the axial dimension (L) of the inner groove is at least slightly greater than the sum of the length (B) of the ferrule   and that (A) of the outer cone (15), measured from the outside   front half (22) of elastic tabs (13) up to the shoulder (16).   2- friction clutch according to claim 1 characterized in that the shoulder (21) is formed by a   elastic stop ring (23) embedded in the ring (17).   3- Friction clutch according to the claims   1 and 2, characterized in that the internal diameter (C) of   the elastic stop ring (23) is. smaller than the dia-   meter (E) of the outer cone (15) measured on the front surface (22) of the elastic tongues (13) when these lS4319.   tabs are pressed into the ferrule (20).