IMPROVEMENTS TO REDUCING COUPLING GEARBOXES.

Abstract

L'invention concerne des perfectionnements au brevet principal. Les perfectionnements consistent à équiper le réducteur d'un embrayage logé dans l'espace occupé par la roue dentée du réducteur coupleur. Cet embrayage est essentiellement constitué de deux portées coniques opposées et symétriques ménagées dans l'alésage de la roue dentée, et deux cones mâles correspondant. Le réducteur trouve une application principale dans l'entraînement des matériels auto tractés.

Description

Advanced training in gearbox couplings. The main patent relates to a reducer coupler of the Type comprising two identical half casings enclosing the entire gear and worm gear reduction mechanism, and a clutch. This reducer / coupler is characterized in particular by having two identical half-cases, containing the entire reduction mechanism with worm gear and clutch composed of friction discs. According to a feature of the main patent, the housing includes a reaction plate, receiving the axial force of the clutch and distributing it over almost the entire front surface of the said assembled housing. According to another feature of the main patent, the two identical half-casings have housings in which bearings are placed when the two half-casings are assembled, thus ensuring their respective positioning. According to a third feature of the main patent, the clutch control camshaft is arranged in such a way that during its rotation around its axis during clutch action, the axial force it exerts on the clutch fork increases. While this entire system performs perfectly well under normal use, it may experience some issues with long-term durability, particularly with regard to the clutch. In certain situations, the clutch is subjected to relatively high torque with frequent use. To date, in reduction devices of this type, multi-disc clutches have been used, which are known in themselves, which have the disadvantages indicated above, and which, moreover, due to their own architecture, have an undesirable size and a number of components which does not allow for a reliable and economical construction. The present addition therefore aims at a reducing coupler conforming to claim 1 of the main patent, characterized in that this tool comprises, in the space occupied by the toothed wheel, a clutch which is essentially constituted by a biconical surface formed in the bore of said toothed wheel, with an axis of symmetry passing through the median radial plane of this wheel, this bore receiving, on either side of said plane of symmetry, two clutch discs whose rim is conical, which are pressed into the corresponding cones of the bore of the wheel, so as to lock the input shaft of said reducing unit with the output shaft, during the clutch action, and conversely to unlock said shafts during disengagement. According to another characteristic, the conical clutch washers located on either side of the toothed wheel have in their center a device intended to lock the said conical washers in rotation with the output shaft, while allowing them to move longitudinally. Thanks to this overall arrangement, the number of parts required for the clutching and disengaging function is reduced, the control inertia is reduced, and the overall size of the reducer equipped with this clutch can be decreased. Other features and advantages of the invention will become apparent from the following detailed description of a preferred embodiment of the invention, given here by way of example and shown in the accompanying drawings, in which - Figure 1 is a plan view of the entire mechanism in its crankcase. - Figure 2 is a perspective view of half a crankcase, and, detached from it, from an exit bearing - Figure 3 is a cross-sectional view of the gear and a cone clutch. According to the description of the main patent, the entire mechanism is housed in a casing consisting of two identical half-casings 1, in which are provided two semi-circular housings 2, in which the bearings 3 of the output shaft 4 are placed... This construction method ensures, during assembly, a perfect positioning of each half-casing relative to the other. The reaction plate 5, made of a rigid material, finally receives the thrust from the clutch action and ensures, by distributing this force over the entire front surface 6 of the assembled housing, the non-deformation and the stiffening of the latter. The worm gear 7 drives the driven gear 8 by its rotational movement, thus reducing the speed. The gear 8 has two conical surfaces of revolution 9 in its bore, into which the two clutch cones 10 are housed during clutch operation. The clutch cones 10 have in their bore a recess 11, in which a part 12 fixed to the output shaft is housed. Thus the clutch cones are fixed to the rotating output shaft, but free to move in a direction parallel to the axis of the output shaft 4, in particular, during the clutch operation. During clutch operation, an axial force is exerted on the thrust bearing 13 by the rotation around its axis 14 of the camshaft 15, which acts axially via the fork 16 The axial clutch force is thus transmitted by the stop 13, to the cones 10 on the internal conical bearing surfaces 9 of the toothed wheel 8, ensuring the locking of the assembly. Conversely, during the disengagement maneuver, the rotation of the camshaft 15 in the opposite direction allows the fork 16 and the thrust bearing 13 to retract, thus enabling the cones 10 to disengage slightly from the internal conical bearing surfaces 9 of the gear. Consequently, there is no longer any rotational drive of the output shaft 4. Only the worm gear 7 and the gear 8 continue to rotate. At this point, the gear 8 is guided and positioned along the three orthogonal axes solely by the remaining contact between the respective female conical bearing surfaces 9 of said gear and the male conical bearing surfaces of the cones 10. In this way, the gear 8 is held in position, which is described as floating, in a very economical manner, without relying on the output shaft or any other component or device for this support.

Claims

Demands 1. A reducing coupler of the type comprising essentially two identical half-cases 1, enclosing the entire reduction mechanism with worm gear 7 and toothed wheel 8, and clutch, characterized in that the clutch mechanism is composed of two symmetrical and opposed female conical bearing surfaces 9 receiving two male cones 10 mounted in opposition.

2. A reducing coupler according to claim 1, characterized in that, in disengagement position, the two male cones 10 ensure the holding in position of the toothed wheel 8, by means of the conical bearing surfaces 9 of said toothed wheel.