FR3054280B1 - TRANSMISSION HOUSING AND ROLLER EQUIPPED WITH SUCH A HOUSING - Google Patents

Abstract

Transmission housing (1) comprising a cone-friction clutch (2), a shaft (3) carrying said clutch (2) and a device (4) for controlling said clutch (2), said clutch (2) comprising at least an assembly, the or each assembly comprising a male cone (71; 72) having a conical friction surface mounted to rotate with the shaft (3) carrying the clutch (2), and a bearing surface (51; ) conical female cone, the cone (71; 72) of said male set, centrally recessed to be positioned on the shaft (3), having, at the peripheral edge delimiting the recess, at least one notch (11). ), the female conical bearing surface (51; 52) and the associated male cone (71; 72) of said assembly being adapted, under the action of the control device (4), to move from a disengaged position. The shaft (3) comprises, for the rotational connection of the male cone (71) of the or at least one of the assemblies with said shaft (3), one or more radial projections (81) made of a single piece with said shaft (3) and each adapted to fit in a notch (11) of the cone (71) male.

Description

FIELD OF THE INVENTION The invention relates to a transmission housing, as well as to a rolling machine equipped with such a housing.

It relates more particularly to a transmission housing comprising, housed at least partially inside the housing, a friction clutch said cones, a carrier shaft of said friction clutch and a control device of said friction clutch, said friction clutch comprising one or more male cone / female cone bearing assembly, the or each assembly comprising a conical friction surface male cone mounted to rotate with the clutch carrier shaft, and a so-called female cone bearing surface, the male cone said set centrally recessed to be positionable on the shaft having, at the peripheral edge delimiting the recess, at least one notch, the female conical bearing surface and the associated male cone of said assembly being fit, under the action of control device, to move from a disengaged position in which the female conical portion and the male cone are spaced apart from each other, to an engaged position in which they are brought together, in bearing contact against each other.

PRIOR ART

Such a transmission box is known. So far, the male cones of the clutch device are mounted integral in rotation with the shaft on which they are threaded through pins through a bore of the shaft.

This results in the obligation to drill the shaft, and a risk of loss or forgetfulness of one of the pins, especially in the case of a clutch with two male cones. GOALS AND SUMMARY

An object of the invention is therefore to provide a housing whose design makes it possible to overcome a drilling of the shaft, or to reduce the number of holes in the shaft.

Another object of the invention is to provide a housing whose design reduces the number of parts inside the housing, and reduce the risk of loss or forgetful parts. To this end, the invention relates to a transmission housing comprising, housed at least partially inside the housing, a friction clutch said cones, a bearing shaft of said friction clutch and a control device of said clutch to friction, said friction clutch comprising one or more assemblies, the or each assembly comprising a male cone with a conical friction surface mounted to rotate with the clutch bearing shaft, and a so-called female conical bearing surface, the male cone of said assembly, hollowed centrally to be positioned on the shaft, having, at the peripheral edge of delimitation of the recess, at least one notch, the female conical bearing surface and the associated male cone of said assembly being fit, under the action of the control device, to move from a disengaged position in which the female cone seat and the male cone are spaced one of the utre to an engaged position, in which they are brought together in bearing contact against each other, characterized in that the shaft comprises, for the rotational connection of the male cone of or at least one sets with said shaft, one or more radial projections made in one piece with said shaft and each adapted to fit into a notch of the male cone.

The realization of at least one radial projection on the shaft as means for securing the shaft with the male cone, said radial projection being made in one piece with said shaft, reduces the number of parts and to eliminate the risk of malfunction resulting from a loss or forgetfulness of said means of securing in rotation.

According to one embodiment, the or at least one of the radial projections is configured to form, in the inserted state in a notch of the male cone of one or of one of the assemblies, in addition to a fastening member. rotation of the male cone and the shaft, an axial limiting stop in displacement in a direction of said male cone along said shaft and / or an axial limiting stop in displacement of the shaft in a direction inside the housing .

The or at least one of the radial projections of the shaft is therefore versatile and configured to form both a means for securing in rotation the shaft and the male cone, and a limit stop in axial displacement in one direction. male cone or tree.

According to one embodiment, the male cone of the or at least one of the sets comprises a large base and a small base and at least one of the notches of said male cone is a blind notch which opens on the large base of said cone male.

The cooperation of the blind recess (s) with the radial projection (s) allows the limitation in axial displacement of the cone along the said shaft, in one direction, that is to say generally in the direction of a reconciliation of the male cone. the wall of the housing of which it is the closest.

According to one embodiment, at least one of the notches of the male cone is a through notch.

According to one embodiment, said sets are respectively called first and second sets, the male cones of the first and second sets are respectively called fixed male cone and movable male cone, the shaft comprises, for the rotational connection of the male cone of each. assemblies with said shaft, one or more radial projections made in one piece with said shaft and each adapted to fit in a notch of the male cone, the radial projection or projections made in one piece with said shaft and adapted each to be inserted into a notch of the fixed cone are called first radial projections, the radial projections or projections made in one piece with said shaft and able to fit each into a notch of the movable male cone are called second projections radial, the notches of the fixed male cone comprise one or more blind notches and one or more notches transverse and the blind and through notches are adapted to allow said fixed male cone by relative rotation of the fixed cone and the shaft, to pass a mounting / disassembling configuration in which the through notches cooperate with the first or second projections radial axes of the shaft for sliding movement of the fixed male cone in the direction of an entry or exit of the permanent interval formed by the first and second radial projections of the shaft, to a configuration of use in which the blind slots of the fixed male cone and the first radial projections of the shaft cooperate with each other for axial immobilization in a direction of said male cone fixed on the shaft within the interval permanent formed by the first and second radial projections of the tree.

The production of male cones with blind and through notches makes it possible to achieve at least some of the radial projections on the shaft, before threading the male cone (s) onto the shaft, without these radial projections disturbing the movement of the cone. on the shaft, in at least one relative angular position of the male cone and the shaft.

According to one embodiment, the male cones are identical from one set to another. This results in further simplification of the device.

According to one embodiment, the transmission housing comprises first and second stop means disposed on said shaft, on either side of the male cone (s), to constitute axial stops defining a fixed maximum length interval, and the first stop means is made in one piece with the or at least one of the radial projections for the rotational connection of the or one of the male cones with the shaft.

According to one embodiment, the second stop means is made in one piece with said shaft. Indeed, in such a housing, the clutch can be used as a speed variator. This results in a heating inside the housing, usually made of plastic. Stop means are provided to avoid the harmful consequences of such heating. These stop means make it possible to subtract the housing from at least some efforts to limit the risk of deformation of the housing.

According to one embodiment, the or at least one of the radial projections of the shaft formed in one piece with said shaft is a radial radial projection, such as a lug or notch, of said shaft.

According to one embodiment, the or at least one of the radial projections of the shaft made in one piece with said shaft is formed by a pinching of the constituent material of said shaft.

According to one embodiment, the or at least one of the female conical bearing surfaces is rotatably securable to a rotating wheel threaded onto the shaft.

According to one embodiment, the or at least one of the conical bearing surfaces is formed by the inner surface of a ring called a female cone, this female cone being housed integrally in rotation inside an axial bore of the wheel threaded onto the shaft, the wheel being a rotating gear driven in rotation by a worm.

According to one embodiment, the conical bearing surfaces capable of being associated, one with the fixed male cone, the other with the movable male cone, are each formed by the internal surface of a ring called a female cone, and the toothed wheel is internally provided with an annular partition separating the axial bore of the toothed wheel into two compartments each housing a female cone, one of the female cones being adapted to cooperate by frictional contact with the fixed male cone, the other cone; female being able to cooperate by frictional contact with the movable male cone.

According to one embodiment, the control device of the clutch is formed of a fork movable angularly about an axis perpendicular to the carrier shaft to allow the passage of the clutch from the disengaged position to the engaged position, rolling members threaded onto the shaft, extending on either side of said fork. The invention also relates to a rolling vehicle equipped with a transmission housing, characterized in that the transmission housing is of the aforementioned type.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which: FIG. 1 represents a perspective view, in an exploded position of the elements constituting it, of a transmission box according to the invention. - Figure 2 shows a sectional view of a transmission housing according to the invention in the disengaged position of the clutch. - Figure 3 shows a sectional view of a transmission housing according to the invention in the engaged position of the clutch. - Figure 4 shows a perspective view of a male cone. - Figure 5 shows a partial perspective view of a tree. - Figure 6 shows a partial view of the shaft, taken at a stop means or radial projections. - Figure 7 shows a sectional view of the shaft, taken at a stop means or radial projections. - Figure 8 shows a schematic view of a rolling machine equipped with such a housing. - Figure 9 shows a sectional view of another embodiment of a transmission housing according to the invention. - Figure 10 shows a sectional view of another embodiment of a transmission housing according to the invention, the transmission housing having only one set.

DETAILED DESCRIPTION

The gearbox 1 of the invention, is more particularly intended to be mounted on a self-propelled machine 20, such as a lawnmower, a snow plow, a golf cart or others, and to extend between a motor member, such as the drive shaft of the machine, generally cutting blade holder of the machine, when the machine 20 is for example a lawn mower, and a drive shaft of the machine , such as the drive shaft of the wheels.

Thus, such a machine 20 is equipped with a motor whose motor output shaft is, for example, equipped with a driving pulley connected via a belt to a driven pulley, this driven pulley being itself even mounted on a motor input shaft intended to be housed at least partially in the transmission housing 1, object of the invention, housing a friction clutch 2 to cones.

In the example shown, this motor input shaft is an endless screw 10 which rotates a toothed wheel 6 threaded onto a shaft 3 carrying said clutch 2 friction. This carrier shaft 3, housed at least partially within the housing, may constitute the drive output shaft of the wheel or wheels of the machine.

The toothed wheel 6 coaxial with the shaft 3 is securable to the shaft 3 via the clutch 2 friction in the engaged position of the latter. This friction clutch 2 comprises one or more male cone / female cone bearing assemblies. Each assembly comprises a female conical bearing surface secured in rotation with the wheel 6 and a conical male surface cone mounted to rotate with the shaft 3 carrying the clutch 2.

The conical bearing surface and the associated male cone of each assembly are capable, under the action of a control device 4 housed at least partially inside the casing, to move from a disengaged position in which they are spaced apart. one of the other, to an engaged position in which they are brought together in bearing contact one against the other.

In the example shown in Figures 1 to 7 and 9, the friction clutch 2 comprises a first and a second male cone / female cone bearing. The first assembly comprises a male cone 71 conical friction surface mounted to rotate with the shaft 3 carrying the clutch 2, and a bearing surface 51 conical female driving.

The conical friction surface of the cone 71 male is adapted to come into bearing contact with the female conical bearing surface 51, in the engaged position of said first set.

Similarly, the second assembly comprises a male cone 72 conical friction surface mounted to rotate with the shaft 3 carrying the clutch 2, and a bearing surface 52 conical female driving. The conical friction surface of the cone 72 male is adapted to come into bearing contact with the female conical bearing surface 52, in the engaged position of said second clutch.

The female conical bearing surfaces 51, 52 may be made in one piece with the wheel 6, and forming at least a part of the axial bore of the toothed wheel, said male cones being arranged coaxial with this bore of the wheel 6.

In the example shown, each female conical seat 51, 52 is formed by the inner surface of a ring called female cone 13. This female cone 13 is housed integrally in rotation inside an axial bore of the wheel 6 threaded onto the shaft 3 and driven in rotation by the endless screw 10.

The toothed wheel 6 is internally provided with an annular partition 14 separating the axial bore of the toothed wheel 6 in two compartments each housing a female cone 13. One of the female cones 13 is adapted to cooperate by frictional contact with the cone 71 male, the other female cone being adapted to cooperate by frictional contact with the cone 72 male.

In the example shown, each female cone is made integral in rotation with the toothed wheel 6 by means of integrally formed notches formed in the housing of the bore of the toothed wheel. For this purpose, the parts of the annular partition 14 intended to come opposite the insertion face of a female cone are castellated. These notches cooperate with corresponding notches arranged on the insertion face of the female cone in the toothed wheel. This introduction face is, in a similar manner, a crenellated face. This results in a simplified assembly of the assembly.

Indeed, each female cone is, for its mounting, simply housed interlocking by cooperation of complementary geometric shapes in the housing of the bore of the toothed wheel.

The toothed wheel is thus equipped with two female cones 13 disposed on either side of the annular partition 14 of the toothed wheel. In this position, each female cone 13 protrudes at least partially outside the bore of the toothed wheel 6.

As recalled above, the tapered surface or friction surface of each female cone is intended to cooperate with the friction surface of the corresponding male cone.

The cones 71, 72 males are in turn hollowed centrally to be threaded on the shaft 3. Each cone 71, 72 male comprises, connecting a large base 711 and a small base, a conical friction surface continuous or having portions cone giving it a general conical shape of revolution.

Indeed, in the example shown, the cones 71, 72 males have on their friction surface three so-called release portions extending back from the imaginary conical surface of revolution passing through said cone portions, each release portion s extending over an angular sector of the cone greater than 20 °. The clearance portions are distributed circumferentially. By virtue of such a design of each cone, the phenomenon of bonding between the male cones and the female cone bearings is no longer observed during the disengagement, which makes the operation of said clutch more reliable.

The cooperation of the male cones 71, 72 with the female conical bearing surfaces 51, 52 is carried out using a control device 4. This control device of the cone clutch mechanism is formed of a member 41 movable angularly about an axis substantially perpendicular to the axis of the shaft 3, to ensure the tightening or loosening of the cones 71, 72 males and corresponding female tapered landmarks 51,52. This control member 41 is formed of at least one spacer called fork, whose angular displacement is controlled by means of a lever, at least partially outside the housing, not shown clutch, returned to the disengaged position by a spring.

The male cones 71, 72 which face each other by their small base are mounted integral in rotation with the shaft 3.

To enable rotation of each of the male cones with the shaft 3, the shaft 3 comprises, by male cone, one or more radial projections and each male cone, one or more notches arranged at the peripheral delimiting edge of the cone. recess of each male cone, the radial projections or projections of the shaft being adapted to fit each into a notch of the male cone.

Thus, in the case of a transmission case with two sets, as illustrated in Figures 1 to 7, wherein the male cone 71 of the first set is called fixed male cone and the male cone 72 of the second set is called mobile male cone , the shaft 3 comprises first radial projections 81 made in one piece with said shaft and each adapted to fit in a notch 11 of the cone 71 fixed male and second radial projections 82 each fit into a notch 12 of the cone 72 movable male.

In the example shown, the cone 71 fixed male comprises, at its recess, two notches 11 blind along the axis of the recess. These two blind slots open into the large base 711 of the male cone. Thus, in the positioned state of the male cone 71 on the shaft, the first two diametrically opposed radial projections 81 are housed in the blind notches 11 of the male cone 71, so that an axial displacement of the cone 71 male is fixed along of the shaft 3 in the direction of an exit of the interval formed by the first and second radial projections by crossing said radial projections, is prevented.

This cone 71 fixed male further comprises, at its recess, two notches 12 through the axis of the recess, that is to say the axis around which the recess is organized. These two through slots thus open into the large base 711 and the small base of the cone 71 fixed male. These notches 12 through are also diametrically opposed, and therefore angularly offset from the notches 11 blind, to form around the recess alternating blind and through notches.

These through notches 12 allow, in a relative angular position of the shaft 3 and cone 71 fixed male, that is to say in the position in which the first radial projections 81 are opposite the notches 12 crossing, the crossing first radial projections 81 through the cone 71 fixed male, to allow entry or exit of the cone 71 fixed male in the interval formed by the first and second radial projections 81, 82.

Once the first radial projections 81 have been crossed, the fixed cone 71 and the shaft 3 are offset angularly by relative rotation to a position in which the blind notches 11 of the fixed male cone 71 are opposite the first radial projections 81, so that an axial displacement of the male cone 71 fixed along the shaft 3 in the direction of an output of the gap formed by the first and second radial projections, crossing said first radial projections 81, is prevented.

The notches 11 blind and 12 through are therefore able to allow the cone 71 fixed male, by relative rotation of the cone 71 fixed male and the shaft 3, to pass a mounting configuration / disassembly in which the notches 12 through cooperate with the first or second radial projections of the shaft for sliding movement of the male cone 71 fixed in the direction of an entry or exit of the permanent gap formed by the first and second projections 81, 82 radials of the shaft 3 to a configuration of use in which the notches 11 blind male cone 71 fixed and the first radial projections 81 of the shaft 3 cooperate with each other for axial immobilization in a direction of said cone 71 male fixed on the shaft 3.

The cone 71 male is called fixed because, in the configuration of use of the clutch, it is immobilized axially in one direction on the shaft 3.

In the examples shown, each radial projection constituting the first or second radial projections 81 82 is formed by a radial point projection, such as a lug or notch of said shaft. Each time, in the examples shown, each radial projection is formed by at least one pinching of the constituent material of said shaft 3, this pinching being obtainable by two facing parts that press, by pinching, the constituent material of said shaft. Thus, the first radial projections 81 comprise two radial projections or lugs formed diametrically opposite on the shaft. These radial projections are distributed over the circumference of the shaft. It could have been provided a single radial projection, but this solution is not preferred.

Thus, the first radial projections form at the same time a limit stop in axial displacement in a direction of the male cone 71 fixed along the shaft 3 and a rotational fastening member of the male cone 71 fixed with the shaft 3.

In the examples represented in FIGS. 1 to 7, the fixed male cones 71 and mobile cones 72 are identical.

The male cone 72 thus also comprises two notch slots 11 and two notches 12 through. This male cone 72 is mounted to rotate with the shaft via the second radial projections 82 of the shaft adapted to be housed in the through notches of the cone 72 male for integral mounting in rotation and free sliding of the cone 72 male on the shaft 3. The second radial projections are made similarly to the first radial projections.

Alternatively, it could have been provided a single cone male / female cone bearing as shown in Figure 10, but this solution is not preferred.

In the example shown in FIGS. 1 to 7, the transmission unit also comprises first and second stop means 91, 92 disposed on said shaft 3, on either side of the male cones 71, 72, to constitute axial abutments defining a fixed maximum length interval, and the first stop means 91 is made in one piece with the or at least one of the radial projection 81 of rotationally fastening the cone 71 fixed male with the shaft 3. The second stop means 92 is also made in one piece with said shaft 3.

The first stop means 91 is thus made in one piece with the first radial projections 81 of the shaft and the second stop means 92 forms with the first radial projections, an interval containing the second radial projections 82. This second stop means 92 is made in a manner similar to the first or second radial projections.

This second stop means 92 is thus made in one piece with the shaft, and is in the form of two diametrically opposite radial projections formed on the shaft.

This second stop means 92 serves as a support surface for the inner ring of one of the rolling members described above. Indeed, the inner ring of one of the rolling members bears on the cone 72 movable male and the inner ring of the other rolling member bears on the second means 92 stop.

The operation of the friction clutch 2 is similar to that of the state of the art and is as follows: during an angular displacement of the control member 41 in the direction of a thrust towards the cones 71, 72 male friction cones 71, 72 male and 13 female cones move relatively, so that the friction surface of each male cone 71, 72 comes into contact with the bearing surface 51, 52 conical female corresponding of a female cone. The permanent rotational movement of the toothed wheel 6 driven by the endless screw 10 is then transmitted via the female cone / male cone connection to the driven shaft 3 which causes a driving of the feed wheels of the self-propelled crane. The advantage of the design as described above is its simplicity, with a reduced number of parts and a risk of loss or forgetting of weaker parts, compared to solutions, including pins.

Figure 10 illustrates a transmission housing with a single cone male / female cone bearing assembly.

Figure 9 illustrates the case of a transmission housing without stop means as described above. In this embodiment, the shaft 3 has only first and second radial projections as described above, and a sleeve threaded on the shaft is disposed between the first radial projection and a housing wall, the face end of this sleeve bearing against the first radial projection 81, to prevent axial displacement of the shaft in one direction.

Claims (13)

Transmission housing (1) comprising, housed at least partially inside the housing (1), a friction clutch (2) with cones, a shaft (3) carrying said clutch (2) friction and a device (4) for controlling said clutch (2) friction, said friction clutch (2) comprising one or more sets, the or each assembly having a cone (71; 72) male, with conical friction surface, mounted integral with rotation of the shaft (3) carrying the clutch (2), and a female conical bearing surface (51; 52), the male cone (71; 72) of said assembly, hollowed out centrally so as to be positioned on the shaft (3), having at least one notch (11) at the circumferential edge of the recess, the female conical seat (51; 52) and the associated male cone (71; 72) of said assembly being suitable under the action of the control device (4) to move from a disengaged position in which the range (51; ) conical female and the cone (71; 72) male are spaced apart from each other to an engaged position, in which they are brought together in bearing contact against each other, the shaft (3) comprising, for securing in rotation the male cone (71) of the or at least one of the assemblies with said shaft (3), one or more radial projections (81) made in one piece with said shaft (3). ) and able to fit each into a notch (11) of the cone (71) male, characterized in that the or at least one of the radial projections (81) is configured to form, in the inserted state in a notch (11) of the male cone (71) of one or more of the assemblies, in addition to a member for rotating the male cone (71) and the shaft (3), an axial limiting stop in displacement along a direction of said cone (71) male along said shaft (3) and / or an axial limiting stop in displacement of the shaft (3) in a direc inside the housing (1). Transmission housing (1) according to claim 1, characterized in that the cone (71) of the male or at least one of the sets comprises a large base (711) and a small base and that at least one of the notches (11) of said male cone is a blind notch which opens on the large base (711) of said male cone (71). Transmission housing (1) according to one of the preceding claims, of the type comprising several male cone / female cone bearing assemblies, characterized in that said assemblies are respectively called first and second sets, in that the cones (71, 72) male of the first and second sets are respectively called cone (71) fixed male and cone (72) movable male, in that the shaft (3) comprises, for Ia rotational connection of the cone (71, 72) male of each of the assemblies with said shaft (3), one or more radial projections (81; 82) formed in one piece with said shaft (3) and able to fit each into a notch (11, 12) of the cone ( 71, 72), in that the radial projection or projections (81) made in one piece with said shaft (3) and able to fit each into a notch (11) of the fixed male cone (71) are first radial projections (81), in that the radial projection or projections (82) s made in one piece with said shaft (3) and each adapted to fit in a notch (12) of the cone (72) movable male are called second projections (82) radial, in that the notches of the cone ( 71) fixed male comprise one or more notches (11) blind and one or more notches (12) through and in that the notches (11) blind and (12) through are adapted to allow said cone (71) male fixed by rotation relative to the cone (71) of the fixed male and of the shaft (3), to move from a mounting / dismounting configuration in which the notches (12) passing through cooperate with the first or second radial projections (81, 82) of the shaft (3) for sliding movement of the male cone (71) fixed in the direction of an inlet or an outlet of the permanent gap formed by the first and second radial projections (81, 82) of the shaft (3) to a use configuration in which the notches (11) bor cone pin 71 (fixed male) and the first radial projections (81) of the shaft (3) cooperate with each other for axial immobilization in a direction of said cone (71) fixed male on the shaft (3) within the permanent gap formed by the first and second radial projections (81, 82) of the shaft (3). Transmission housing (1) according to one of the preceding claims, of the type comprising several assemblies, characterized in that the male cones (71, 72) are identical from one assembly to another. Transmission housing (1) according to one of the preceding claims, characterized in that it comprises first and second means (91, 92) for stopping disposed on said shaft (3), on both sides male cone or cones (71, 72) for constituting axial stops defining a fixed maximum length interval, and in that the first stop means (91) is made in one piece with the or at least one one of the radial protrusions (81) for rotationally fastening one or more male cones (71) with the shaft (3). Transmission housing (1) according to the preceding claim, characterized in that the second means (92) for stopping is made in one piece with said shaft (3). 7. Housing (1) for transmission according to one of the preceding claims, characterized in that the or at least one of the projections (81, 82) radial shaft (3) formed in one piece with said shaft (3) is a radial point projection, such as a lug or notch, of said shaft (3). Transmission housing (1) according to one of the preceding claims, characterized in that the or at least one of the radial projections (81, 82) of the shaft (3) formed in one piece with said shaft (3) is formed by a nip of the constituent material of said shaft (3). Transmission housing (1) according to one of the preceding claims, characterized in that the or at least one of the female conical bearing surfaces (51, 52) can be rotatably connected to a rotary wheel (6) threaded on the tree (3). Transmission housing (1) according to the preceding claim, characterized in that the or at least one of the conical surfaces (51, 52) is formed by the internal surface of a ring called a female cone (13). female cone (13) being housed integrally in rotation inside an axial bore of the wheel (6) threaded onto the shaft (3), this wheel being a rotating gear driven in rotation by a screw ( 10) endlessly. 11. housing (1) transmission according to the preceding claim taken in combination with claim 3 and of the type whose bearing surfaces (51, 52) conical capable of being associated with one (51), cone (71) fixed male, the other (52) to the cone (72) movable male are each formed by the inner surface of a ring (13) called female cone (13), characterized in that the toothed wheel (6) is internally provided with a annular partition (14) separating the axial bore of the toothed wheel (6) into two compartments each housing a cone (13) female, one of the female cones (13) being adapted to cooperate by frictional contact with the cone ( 71) fixed male, the other female cone being adapted to cooperate by frictional contact with the cone (72) movable male. 12. housing (1) transmission according to one of the preceding claims, characterized in that the device (4) for controlling the clutch (2) is formed of a fork (41) movable angularly about an axis perpendicular to the shaft (3) carrier to allow the passage of the clutch (2) from the disengaged position to the engaged position, rolling members (15) threaded on the shaft (3), extending from and other of said fork (41). 13. Machine (20) rolling equipped with a housing (1) for transmission, characterized in that the housing (1) for transmission is according to one of claims 1 to 12.