FR2787158A1 - Hydraulically operated disengagement mechanism for clutch of motor vehicle has radial sealing ring housed in seal carrier centered on bore wall of gearbox and in installed position aligns with end face of gearbox - Google Patents

Abstract

The clutch disengaging mechanism(2) includes a radial sealing ring(17) housed in a seal carrier(1a) centered on the bore wall of the gearbox(3) and in the installed position aligns with an end face of the gearbox. The seal carrier in installed to be positionally orientated to the gearbox and at the same time positionally centers the cylinder of the clutch disengaging mechanism. The sealing ring carrier is manufacture by a non-cutting method comprising deep drawing from steel plate.

Description

The invention relates to a declutching device which can be actuated by

  hydraulic path, which is intended for a switching separation clutch in a vehicle, in which a cylinder and an annular piston guided so as to be displaceable in the cylinder, are arranged concentrically with respect to an input shaft of the gearbox speeds. The cylinder, which is arranged in the form of a pressure housing and can also be designated as a receiving cylinder, is supported on a gearbox housing, a sealing ring with radial corrugations, inserted in a support. sealing ring, being arranged in the application area of the cylinder for sealingly closing an annular opening between the input shaft of the gearbox and

the housing bore.

  For a tightness check of the gearbox casing, it is advantageous to use a sealing device installed on the gearbox casing and which can be mounted and fixed separately from the

  declutching, that is to say of the receiving cylinder.

  According to the German document DE 30 44 048 A1 we know such a

  device comprising a corrugated radial sealing ring, this agency-

  ment comprises a gearbox input shaft, which is supported and journalled in the gearbox by means of a grooved ball bearing. The bearing partially extends axially from the gearbox housing. A cover, which is journalled in front of the bearing is fixed to the gearbox housing, is used to house the corrugated radial seal ring and to fix the position of the bearing. The cover, which is arranged in the form of a solid piece, that is to say is manufactured by removal of chips and can also be designated as a support for a sealing member, requires a large mounting space both in the axial direction and in the radial direction. Due to the arrangement of the known declutching device, in which the support of the sealing member or the cover are integrated in the cylinder of the declutching device, an axial mounting space is obtained which is influenced by the configuration of the support of the sealing ring and is increased, which is a drawback. In addition, the known solution does not provide any indication concerning the centering of the declutching device with respect to the gearbox casing or to the input shaft of the gearbox. Compared to the known state of the art, the invention must provide a seal which - does not affect the mounting space of the declutching device; guarantees centering for the subsequent mounting of the declutching device;

  - reduces manufacturing and assembly costs.

  The problem according to the invention is solved in a hydraulically actuated declutching device, provided for a switching separation clutch in a vehicle, in which a cylinder and an annular piston guided in a displaceable manner in the cylinder, are arranged concentrically with an input shaft of a gearbox, and the cylinder is fixed to a gearbox housing, and in which a radial circular sealing ring is provided in a bearing area of the cylinder on the gearbox housing as a sealing member of an annular opening between the input shaft of the gearbox and a bore wall, characterized in that the circular sealing ring radial is housed in a support, which is centered in the wall of the gearbox housing bore and, in the assembled state, is aligned with a front face of the gearbox housing, the the sealing ring being mounted by being positioned in an oriented manner relative to the gearbox casing and simultaneously producing

  centering the disengaging device cylinder in position.

  Thus there is provided a sealing member support which, in the state

  mounted, is centered in the bore of the gearbox housing. The sup-

  sealing member port provided in accordance with the invention, which comprises, on its inner profile, a corrugated radial sealing ring, is arranged so that in the mounted state this support is aligned with a front face

  of the gearbox housing. Thereby the support of the sealing organ

  stiffness according to the invention is neutral from the mounting point of view, that is to say that this support has an influence, determined by the wall thickness of the

  sealing ring support, only on the axial mounting space.

  The radial mounting space of the declutching device is not influenced by the support of the sealing member. Preferably the support of the sealing member is arranged so as to be placed in an oriented position relative to the gearbox casing and, for this purpose, is connected, at its external contour, according to a connection by complementary shapes to the gearbox housing. The arrangement of the support

  the sealing member also allows centering of the cylinder relative to

  port to the gearbox housing. Thereby a provision of the cylinder in a position oriented relative to the input shaft of the gearbox is guaranteed. The arrangement of the support of the sealing member reduces the manufacturing costs and simplifies the assembly, so that a cost advantage is also obtained compared to the known solution outside of optimization. already explained from the mounting space

and centering of components.

  According to an advantageous embodiment, there is provided a support for the sealing member, which is made of a steel sheet and which is preferably produced without chip formation, according to a stamping process. It is appropriate to use a support for the sealing member arranged in the form of a disc. The support of the sealing member forms an annular flange which, in the assembled state, is applied against the front face of the housing.

  the gearbox. To the annular flange is connected radially inward

  laughing, a circumferential fold, which is oriented axially in the direction of the gearbox case and by means of which the support of the sealing member is centered in the bore of the gearbox case. Instead of a circumferential fold, the invention also includes a support

  sealing member, which has individual axial projections

  dual distributed on the periphery, for centering the sealing member in the gearbox housing. A sealing member support arranged in this way can be produced inexpensively in large series

  by means of a stamping process.

  In order to optimize the components, it is provided according to the invention to arrange the corrugated radial sealing ring directly on the sealing member support. Preferably the sealing ring

  corrugated radial is for this purpose vulcanized on the support of sealing member

  cheeness at the level of the central opening.

  According to the invention, there is further provided a removable attachment of the declutching device to the gearbox casing. Preferably a screw connection is used for this purpose, by means of which both the

  cylinder or the declutching device as the support of the sealing member

  are fixed. Otherwise it is proposed, to create a unit that can be pre-assembled, to connect the cylinder to the support of the sealing member. For this purpose it is appropriate to provide a screw connection, by means of which a removable fixing of the support of the sealing member can be made on the cylinder of the declutching device. Independently of this fixing, the declutching device is screwed by means of a screw connection

  directly on the gearbox housing.

  Furthermore, the invention includes the possibility of fixing the support of the sealing member on the gearbox casing, separately from the

  cylinder. For this purpose, shortened screws should be used, which are used

  instead of the normal screws - with which the unit formed by the

  cylinder and the support of the sealing member, must be fixed. Therefore

  quent can be fixed the support of the sealing member alone on the gearbox housing, and it is therefore possible to perform for example a leakage check of the gearbox housing without a cylinder,

  connected by flange, of the declutching device.

  In a manner conditioned by the operation, an assembly, in an oriented position, of the declutching device with respect to the gearbox casing is necessary. To obtain this mounting position, the support of the sealing member preferably comprises, at a level of contact with the casing of the gearbox, a projecting part, preferably a bent part, a ribbed element. or a tab, arranged by planking or deformation and which engages in a connection by complementary shapes in a corresponding recess of the gearbox housing. In addition, the invention includes a rotation blocking system between the support of the sealing member and the cylinder, which simultaneously guarantees a centering function of the cylinder. To this end, it is advantageous to provide, on the support of the sealing ring, a rim at a right angle which also engages in a form connection.

  complementary in a recess or an opening of the cylinder of the

declutching device.

  The support of the sealing member according to the present invention includes, on the gearbox side, a shielding sheet preformed on the sealing ring with radial undulations. The shielding sheet preferably arranged in the shape of an L is retained with a first branch directed axially, according to a force connection, on the fold of the support of the sealing member. The second radially directed branch is guided to an annular slot on the guide shaft of the gearbox. The shielding sheet supports the sealing member with radial corrugations vis-à-vis a direct stress by a pressurized fluid, which can affect the

  functioning of the sealing lip and consequently the sealing action

  corrugated radial sealing member.

  Other features and advantages of the present invention

  will emerge from the description given below taken with reference to the drawings

annexed, on which:

  - Figure 1 shows a hydraulic declutching device, which

  takes a cylinder (receiving cylinder) as well as a sealing ring support according to the invention; - Figure 2 shows a sealing ring support, which is fixed in a different way than in Figure 1, in the assembled state; and - Figure 3 shows a detail of the sealing support shown on

  Figure 2, in an enlarged view.

  Figure 1 shows a sealing member support 1a according to the invention, which is arranged in a position mounted between a device

  clutch 2 and a gearbox 3 of a gearbox. The debra-

  yage 2 comprises a cylinder 4a arranged in the form of a pressure casing and fixed coaxially to an input shaft 5 of the gearbox, and this in a removable manner on the casing 3 of the gearbox. The cylinder 4a contains a guide sleeve 7, which is arranged being radially distant both from the input shaft 5 of the gearbox and from a wall 8 of the bore of the cylinder 4a and, together with the wall 8 of the bore, radially defines a pressure chamber 9, in which an annular piston 6 is guided so as to be displaceable axially. For fixing the guide sleeve 7, the latter is formed in one piece with an annular flange 10 on the end directed towards the support 1a of the sealing member. On the side turned away from the space of the pressure chamber 9, on the annular piston 6 is fixed a clutch release bearing 11, which in the assembled state, is supported according to a force connection by means of disengagement of a friction clutch. The pressure chamber 9 can be charged with a pressurized fluid by means of a supply bore 12, to allow the triggering of an axial displacement of the annular piston 6. We will not return in more detail to the operation of the declutching device 2, being

  given that the latter does not differ from known declutching devices.

  The sealing member support 1a according to the invention represents a component, which is formed by deep drawing of a steel sheet and has an arrangement which to a very large extent is disc-shaped. The seal ring support 1a is centered on a bore wall 14 by means of a circumferential fold 13 or of fold parts arranged by being distributed over a part of the circumference or by means of protrusions oriented axially in the direction of housing 3 of the

  gearbox. An annular flange 15 of the support 1a of the sealing member

  chewiness, which is connected radially, on the outside, to the fold 14, is supported on a front face 16 of the casing 3 of the gearbox and has a dimension which corresponds to a bearing surface of the cylinder 4a. The sealing support la comprises, on the inner side from the radial point of view, a corrugated radial sealing ring 17 and is integral therewith, this ring being fixed by vulcanization directly on the edge of a central opening of the support la the sealing member 1a, the sealing lip 18 of this ring applying in a sealed manner against a surface

  casing of the input shaft 5 of the gearbox.

  To establish a blocking of the position of rotation between the support 1a of the sealing member and the casing 3 of the gearbox, the annular flange 15 comprises at least one bent part in the form of a tab 19, which s 'engages in a connection by complementary shapes in a recess 20 of the casing 3 of the gearbox. Instead of a tab, it is also possible to use any other geometrical shape, with which the support 1a of the sealing member can be fixed in position relative to the casing 3 of the box. of speeds. In addition, the support 1a of the sealing member comprises a rotation blocking system 21, arranged in the form of a bevel 22 which projects axially in the direction of the cylinder 4a and is located in the region of the annular flange 15 , this bevel engaging in the assembled state, in a connection by complementary shapes, in a recess 23 of the cylinder 4a. The system

  rotation blocking 21 simultaneously assumes a centering function.

  Preferably the rotation blocking device 21 is arranged opposite the tab 19 of the support 1a of the sealing member, with which this support is fixed in position on the casing 3 of the gearbox. The declutching device 2 is removably fixed to the casing 3 of the gearbox using a screw connection. The housing bores 24 formed in the cylinder 4a of the declutching device 2 coincide in size and position with the bores 26 of the support 1a of the sealing member so that simultaneously the declutching device 2 and the support the of the sealing member are fixed, by means of screws 24 on the casing 3 of the gearbox. The support 1a of the sealing member also comprises a shielding plate 30, which is oriented in the direction of the casing 3 of the gearbox and has a cross-sectional profile in the shape of an L. A first branch oriented axially 31 of the shielding sheet 30 is retained according to a force connection on an inner side of the fold 13. A second radial branch 32 surrounds the assembly 17 of the corrugated radial sealing ring including its sealing lip and s' extends all the way to shaft 5 of the gearbox

  by maintaining an annular slot 33.

  In a second embodiment (Figure 2) of a support lb

  of the sealing member according to the invention, the components, which are identical

  ticks to those of the first embodiment, are provided with the same reference numbers so that in order to avoid repetitions, it is possible to

  refer to the description of the first exemplary embodiment.

  Figure 2 shows the support lb of the sealing member, which is fixed by means of several screws 27 on the casing 3 of the gearbox separately from the declutching device 2. The assembly sequence provides that one connects first of all frontally by flange the support lb of the sealing member lb together with the radial circular sealing ring 17, on the casing 3 of the gearbox and that is fixed by means of the screws 27. Then comes the mounting of the cylinder 4b, which in accordance with FIG. 3 is fixed by means of a screw connection between the support 1b of the sealing member and the cylinder 4b. Preferably, it is proposed to use for this purpose a hexagon socket screw 28, which is inserted in a bore of the cylinder 4b and is screwed into a nut 29 which is preferably fixed immovably on the support lb of the sealing member. This

  screw connection can also be arranged in reverse, that is to say

  say that the nut 29 is fixed on the cylinder 4b and the screw is inserted in the

  drilling of the support lb of the sealing member.

  The invention is not limited to the embodiments described above and on the contrary many changes and modifications

  are possible without departing from the scope of the invention.

Claims (11)

  1. A hydraulically actuated declutching device, provided for a switching separation clutch in a vehicle, in which a cylinder and an annular piston guided in a displaceable manner in the cylinder (4a, 4b) are arranged concentrically. ment to a gearbox input shaft, and the cylinder is fixed to a gearbox casing, and in which a radial circular sealing ring (17) is provided in a bearing area of the cylinder on the gearbox housing as a seal for an annular opening between the input shaft of the gearbox and a bore wall, characterized in that the seal ring radial circular is housed in a support, which is centered in the wall of the gearbox housing bore and, in the assembled state, is aligned with a front face of the gearbox housing (3), the support of the sealing ring As mounted by being positioned in a facing manner relative to the gearbox housing and carrying simultaneously   centering in position of the clutch release cylinder.   2. Clutch release device according to claim 1, characterized in   that the support (la, lb) of the sealing ring is manufactured without forma-   tion of chips by means of a stamping process of a steel sheet.   3. A declutching device according to claim 1, characterized by a support (la, lb) of the sealing ring, which is arranged in the form of a disc and is supported by an annular flange on the front face of the casing of the gearbox. gears, and to the annular flange is connected radially, on the inside, a fold (13), which is axially oriented and extends around the circumference or is provided in a partial manner, and which is centered on the   wall of the gearbox housing.   4. Release device according to claim 1, characterized in that the radial circular sealing ring is fixed directly on the support (la, lb) of the sealing ring, in a non-removable manner, and this preferably by vulcanization.   5. Release device according to claim 1, characterized in that for fixing the cylinder (4a), there are provided screws, which fix   simultaneously the support (la) of the sealing ring.   6. A declutching device according to claim 1, characterized in that for mounting the declutching device, firstly the support (lb) of the sealing ring is removably attached to the cylinder.   before screwing the clutch release device onto the gearbox housing.   7. Release device according to claim 1, characterized in   that the seal ring support is removably attached separately   rement of the cylinder (4b) on the gearbox housing (3) so as to allow a tightness check of the gearbox housing without   that the declutching device is connected completely by flange.   8. Release device according to claim 1, characterized in   that for obtaining a mounting, in an oriented position, the support   port of the sealing ring has, in a rotating application surface   born towards the gearbox housing, a protruding appendage, which   pledge according to a connection by complementary shapes in a recess of the gearbox casing and is preferably arranged in the form of a tab (19), which is fixed on the support of the sealing ring and   engages in a recess (20) in the gearbox housing (3).   9. A clutch release device according to claim 1, characterized in that the support of the sealing ring forms with the cylinder a   rotation blocking device (21), which simultaneously performs a function   centering for the cylinder (4a) and for this purpose the support of the sealing ring is provided with at least one bevelled part (22), which,   in a mounting position, engages in a form-fitting connection   in a recess in the cylinder.   10. A declutching device according to claim 1, characterized in that on the gearbox housing is installed, in front of the sealing ring with radial undulations, a shielding plate (30) which surrounds the sealing ring on the outside. corrugated radial (17) including its sealing lip and extends up to the vicinity of an envelope surface of the input shaft of the gearbox, while maintaining a slot annular (33).   11. A declutching device according to claim 10, characterized by an L-shaped shielding sheet, the first branch of which is directed.   axially (31) is retained according to a force connection on the fold of the support of the sealing ring and whose second branch oriented radially (32) forms, with the input shaft of the gearbox, the annular slot .