FR2465929A1 - DIFFERENTIAL MECHANISM - Google Patents

Abstract

MACHINE ORGANS. THE MECHANISM INCLUDES TWO COAXIAL PLANETARY SPROCKETS 1, 2 CONNECTED RESPECTIVELY BY TWO TIMED BELTS 6, 7 TO TWO SATELLITE SPROCKETS 4, 5 DOORS BY A 14 SHAFT RUNNING ON A PLATE 3 MOUNTED MAD ON A CENTRAL SHAFT 11 ON WHICH THE 2 OF THE PLANETARY SPROCKETS IS RIGIDLY FIXED AND THE OTHER 1 ROTATED CRAZY. THE RIM 19 OF THE PLATE 3 SHAPED TOOTHED WHEEL CLEAN TO RECEIVE A NOTCHED BELT 21. THE INVENTION IS APPLICABLE EVERY TIME A DIFFERENTIAL MECHANISM OF ECONOMIC STRUCTURE, NEEDING NO MAINTENANCE, AND MAKING NO NOISE.

Description

The invention relates to differential mechanisms that

  have two coaxial planetary pinions at one

  with two connected satellite gear gears, respectively

  the two planetary gears.

  In the known mechanisms of this kind, the toothed gears, in engagement with each other, are made of steel or

  plastic material and have to turn in a hellish oil bath.

  in a sealed casing, otherwise they would not be able to

  put that very weak couples. When they are metal,

  these gears must be carefully ground.

  kills a very expensive machining operation and, despite this

  caution, they generate a level of noise still very high.

  The object of the invention is to provide a different mechanism

  which does not have the aforementioned disadvantages of the

known mechanisms.

  For this purpose, according to the invention, the connection between

  each of the two planet gears and the planet wheel gear cor-

  respondant consists of a toothed belt. Thus, the teeth of the toothed gears no longer need to turn in an oil bath, and they do not need to be ground,

  because, even if they are rough, they cooperate in very good

  conditions with the trapezoidal section teeth of the

  so-called notched spokes equipped with an inner frame capable

  to ensure desirable solidity and dimensional stability.

  Given the large number of teeth engaged, such mechanisms

  they are able to transmit couples of

  you. Finally, the operation of the timing belts is silenced.

  heavens. If, according to another characteristic of the invention,

  the crown of the mechanism is constituted by the rim of a

  made of aluminum, which forms a planet carrier, the latter

  feels a very low inertia opposing only little resistance

  accelerations, especially reversals of meaning.

  The invention will be better understood on reading the

  description which will follow and on examination of the annexed drawing of which

  the single figure shows, by way of example, in perspective, a

  embodiment of a differential mechanism according to the

  vention. The differential mechanism shown in the drawing

  comprises two planetary pinions 1, 2 coaxial to a plane

  3 which carries two pinions satellites 4, 5 respectively-

  connected to the two planetary gears 1, 2 by two belts

notched 6, 7.

  One of the two planetary gears, the pinion 1, for example, is rotatably mounted on a central shaft 11, (which can, for example, freely journall in bearings (no

  represented) on which the plate 3 turns crazy too. The au

  planetary gear 2 is fixed rigidly on the central shaft

  11, for example by means of a key 12. The two sprockets

  tellites 4, 5 are fixed rigidly, respectively, on both ends of a shaft 14 which is parallel to the central shaft 11 and which rotates freely in a bearing formed by a boss

  3. For the sake of clarity, we have

  significantly managed the axial gap between the two planetary gears 1, 2 and the axial gap between the two gears

  satellites 4, 5, but in reality these gears would be position-

  respectively against the side faces of the hub 17 and

boss 15 of the tray 3.

  The plate 3 is made of light metal, for example aluminum

  nium, preferably anodized, and it is in the form of a relatively thin web 18, provided with a hub 17 and whose rim 19 is cut in the form of a toothed wheel adapted to receive

another toothed belt 21.

  The advantages of the particular structure of this differential mechanism will not be discussed again, since these have already been discussed above. It can be added, however, that the mechanism works in planetary speed reducer when

tray 3 does not turn.

Claims (5)

  1. Differential mechanism with two sprockets   planetary teeth coaxial to a crown that carries two   satellite gear teeth connected respectively to the two   planetary gnons, characterized in that the link between   one of the two planet gears (4,5) and the corresponding planet gear (1,2) is constituted by a toothed belt (6,7).   2. Differential mechanism according to claim 1,   characterized in that the planet carrier ring is con-   staggered by a plate (3) in which an eccentric shaft (14) journals on which the two planet gears (4,5)   are rigidly fixed on both sides of said plate.   3. Differential mechanism according to claim 2, characterized in that the plate (3) is rotatably mounted   on a central shaft (11) carrying the two planet gears   res (1,2) of which one (2) is integral with said tree and the other   (1) rotatably mounted thereon.   4. Differential mechanism according to any one   Claims 1 to 3, characterized in that the crown   carrier has a toothed rim (19) shaped to   receive a toothed belt (21).   5. Differential mechanism according to any one   Claims 2 to 4, characterized in that the plate (3)   is made of light metal, for example aluminum, preferably anodized.