FR2837251A1 - Automobile double clutch transmission - Google Patents

Abstract

The double clutch transmission comprises two sub-transmissions (A,B) each having a primary shaft (1) with several pinions for different gear ratios. Each pinion (2,3) of the primary shaft of the first sub-transmission is associated with several gear ratios. There is an intermediate idler pinion (4) of the lowest gear for the reverse gear. The reverse gear and the idler gear of the largest gear can be engaged by means of a common sliding sleeve (8).

Description

to propeller.

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  The present invention relates to a transmission, double clutch more precisely, with at least two soul-transmissions, each having a primary shaft with several pigeons for the realization of different gear ratios. Double clutch wind transmissions already known in the field of automotive technology. These can be engaged under load and offer quality gear shifts. Compared with a manual gearbox, the double clutch, however, imposes a higher axial size, hence the need to design a transmission as racing as possible. At the same time, the trend is to increase the number of gears

  on transmissions, hence an increase in the required dimensions.

  The dual-clutch transmission is made up of at least two transmissions or soul-transmissions, which wind into each other. The first soul-transmission can present, for example, several speeds with different gear ratios, and a reverse. The second soul-transmission can, in the same way, offer several speeds with different gear ratios. The reverse of the first soul-transmission should present, in connection with the differential, a multiplication according to an order of magnitude known for an ordinary manual transmission. In addition, the speed 2 0 with the reduction in the longer stroke can be combined with a reduction comparable to that of the first or second on transmissions

known manual.

  The object of the present invention is to provide a transmission or, more precisely a double clutch transmission, with two retransmissions.

  at least, making it possible to obtain a reduced bulk.

  This objective is achieved according to the invention by a transmission and, more particularly, a double clutch transmission, comprising at least two sub-transmissions, on which a pigeon of a primary shaft at least on the

  soul-transmission corresponds to several speeds.

  The invention proposes a transmission or, more precisely, a double clutch transmission, with common control pigeons for the different speeds and for the reverse gear, this solution making it possible to considerably reduce the final overall dimensions. Such a double clutch transmission is particularly advantageous in terms of efficiency, due to

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  the teeth of the pigeons; moreover, during gear changes, this solution

  promotes lossless torque transfer with iliction clutches.

  An improvement of the invention makes it possible to associate several speeds with each pigeon of the primary shaft of the first soul-transmission. Such a solution requires only two pigeons on the primary shaft of the soul-transmission A, each being provided for two reports preferably. This configuration

  has the advantage of saving two levels of pigeons on the

  transmission, which results in a reduction of 25 to 45 mm at least

  the axial size of the transmission.

  According to an advantageous improvement, it is possible to provide, for the reverse, a pigeon acting as an intermediate pigeon. Therefore, it is unnecessary to ride additional intermediate pigeons for the reverse. As intermediate pigeon, we will preferably use the crazy pigeon of

  the smallest speed or offering the most running gear.

  Contrary to known transmissions, it is possible, on the sub-transmission A, to preferably engage the lowest speed or offering the most running gear, and the highest speed or offering the longest gear, at [' using a common sliding sleeve. Furthermore, using the sliding sleeve of the other shaft, it is possible to engage the intermediate speed of the soul-transmission A, as well as the reverse gear. The double clutch transmission according to the present invention

  accepts the implementation of other actuation modes.

  On each soul-transmission, the couple can be transmitted to the mad pigeon

  of the shortest or shortest speed, by a pigeon on the primary shaft.

  In this case, it is preferable that the crazy pigeon is not in connection with the tree, but that it can turn freely around this tree. The pigeon controls the pigeon of the reverse which is preferably in connection with the shaft, in rigid grip for example. In this way, the movement can be transferred to the differential by the pigeon. The second pigeon 28 acting on the

  differential can preferably rotate with shaft 23.

  According to this configuration, the differential and the primary shaft with the pigeon rotate in opposite directions with this pair, while the two pigeons move in the same way, when the forward gear is engaged (for example,

  when the pigeon and the tree wind in connection via the gear sets).

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  On a dual-clutch transmission according to the invention, it is found that the shortest or shortest speed of the A-transmission has gear ratios in the range of about 65 to 120% of the

reverse gear multiplication.

  According to a particularly advantageous configuration of the invention, it is possible to start again on the two soul-transmissions the pigeons used several times, the aim being, moreover, to save the intermediate pigeon for the reverse market. An improvement of the invention makes it possible to provide, on the sub transmission B. that the pigeons correspond to the two speeds are controlled, for example, by a common pigeon on the primary shaft. Of this

  in this way, the requirements in terms of gear ratio achieved.

  In addition, it is also possible, on the soul-transmission A, to establish on the same tree as the crazy speed pigeon with the short ratio of the sub-transmission A, a crazy pigeon of the higher speed of the soul-transmission B The soul-transmission A low speed crazy pigeon can then do

  function, simultaneously, of intermediate pigeon of reverse market.

  In the case of a transmission comprising a high number of speeds (7 gears in forward gear for example), it may prove advisable, on the sub transmission A, to use the same pigeon on the primary shaft for the speed normal start and reverse. On transmission B. it will then be possible to use an all-terrain or maneuvering speed, or similar, with an even more multiplied gearing, which will be mainly used for off-road evolutions, vehicle maneuvers and hill starts with a heavy load, in order to save the dry clutch correspond to

ordinary starting speed.

  Other advantages and advantageous configurations arise from sub

  claims and drawings presented below in which:

  Figure 1 shows a schematic view of a soul-transmission on a double clutch transmission according to the invention, Figure 2 shows a schematic view of several pigeons engaged to materialize the torque in reverse, Figure 3 represents a view schematic of the two soul-transmissions in a double-clutch transmission according to the invention and, finally,

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  FIG. 4 represents a schematic view of the dual-clutch transmission according to the invention with an all-terrain speed, a speed of

  normal start and reverse.

  Figure 1 offers a schematic view of a soul-transmission on a transmission according to the invention and, more particularly, on a dual-clutch transmission. The dual clutch transmission includes two interlocking transmissions, the soul-transmissions A and B in this case, the soul-transmission B

  being simply sketched in Figure 1.

  The soul-transmission has three speeds with different gear ratios, as well as a reverse. Soul-transmission B also has two speeds with different gear ratios. The reverse, on the soul-transmission A, must present with a differential 14 a

  multiplication of an order of magnitude known for manual kansmissions.

  Furthermore, the forward speed offering the shortest gear ratio must have a gear ratio similar to that of the

  first or second speed on known manual transmissions.

  The dual-clutch transmission according to the invention, with common control pigeons for the gears and for the reverse gear, is presented with

in more detail below.

  The soul-transmission A of the double-clutch transmission according to the invention has a primary shaft 1, simply requiring two pigeons 2 and 3 corresponding to two speeds. This solution makes it possible to save two levels of pigeon, which results in a reduction of at least 25 to 45 mm in the axial bulk of the transmission. For the reverse, it is not useful to use intermediate pigeons, since the crazy pigeon 4 speed with the most multiplied gear acts simultaneously as a pigeon

  intermediate for the reverse market.

  In accordance with the invention, the lowest speeds or with the most multiplied speed are not engaged using a common sliding sleeve 8 on a shaft 10, as is the case with known transmissions. The pigeon 4 of the lowest speed and the pigeon 5 of the highest speed control together using a common sliding sleeve 8. The sliding sleeve 9 on the shaft 11 controls the pigeon of the intermediate speed 6 on soul-transmission A considered, as well as pigeon 7 of

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  reverse. On the two trees 10 and 11 with the crazy pigeons are the

  exit pigeons 12 and 13, which mesh with differential 14.

  Figure 2 shows in partial view another configuration of the double clutch transmission according to the invention, visualizing the torque within the soul-transmission A. A pigeon 21 on the primary shaft is engaged with the crazy pigeon 22 of the lowest speed, without being in connection with the shaft 23 but rotating freely around this shaft. The pigeon 22 is. as for it, in engagement with the reverse pigeon 24 which, when it is engaged, is in rigid connection with a shaft 25. In this way, a differential 27 is controlled by the intermediary of a pigeon 26. The second pigeon 28 commanding the differential

rotates with the shaft 23.

  The differential 27 and the primary shaft with the pigeon 22 rotate in opposite directions, with this torque, while the two pigeons move in the same way, when the forward gear is engaged (for example, when the

  pigeon 22 and the shaft 23 wind in connection via the gear sets).

  According to another configuration of the invention, represented in FIG. 3, it is possible to distribute on the two soul-transmissions A and B the pigeons used several times To save, on this configuration also, the intermediate walking pigeon rear, the reverse is carried out on the sub transmission A by the pigeon 41 in the manner mentioned above. The two pigeons 42 and 43 correspond to the speeds (in forward gear) of the sub wind transmission B controlled by a common pigeon 44 on the primary shaft 45. Under these conditions, taking into account the requirements stated above for the gear ratios on the soul-transmission A, it is possible to mount the crazy pigeon 42 of the speed with the longest gear ratio of the soul-transmission B. on the same shaft 46 as the crazy pigeon 47 of the speed with the ratio of shortest reduction in soul transmission A. The pigeon

  fou 47 also acts as an intermediate reverse pigeon.

  With double clutch transmissions with a high number of gears, (7 reports 1, 2, 3, 4, 5, 6 and 7 for example), it is possible, depending on the configuration shown in Figure 4, to use on soul-transmission A, for normal starting speed 2 = A and reverse R with a

  reduction of i = 10 ... 15 for example, the same pigeon on the primary tree.

  On soul-transmission B. we can then use an all-terrain or maneuvering speed 1 = K with an even more multiplied gear, of the order of i = 15

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  22. This speed 1 = K is mainly used for evolutions in all -

  terrain, vehicle maneuvers and hill starts with a heavy load, in order to save the dry clutch associated with the ordinary start speed 2 = A. the embodiment presented in FIG. 4 offers the following ratios: (1) = all-terrain speed; (2) = starting speed; (3); (4); (5); (63; (7); (R)

  The claims presented with this patent application are

  wording proposals, without prejudice to obtaining more extensive patent protection. The applicant reserves the possibility of claiming combinations of characteristics, which, until now, have not been disclosed

  as in the description and / or the sins.

  The references used in the subclaims refer to each other

  configuration of the subject matter of the main claim with the features of the sub-claim under consideration; they should not be understood as a renunciation of the obtaining of individual protection for combinations of

  characteristics of the subclaims with references.

  To the extent that the subject matter of the subclaims may constitute,

  taking into account the state of the art at the priority date, separate autonomous inventions

  the plaintiff reserves the right to make claims

  independent from the subject or declarations of separation / division.

  These may also include independent inventions, constitute

  an independent realization of the objects of the preceding subclaims.

  The exemplary embodiments should in no case be assimilated to a restriction of the invention. On the contrary, in the context of this presentation, numerous variants and modifications are permitted, in particular with variants, elements and combinations and / or materials, which, by combining or modifying characteristics, elements or stages of pro cedes

  individual, in connection with the general description and the modes of realization

  described in the claims and shown in the drawings, may be used

  by the skilled person to realize the object of the invention and lead, with combinable characteristics, to a new object or to new steps or sequences of processes, even if these relate to manufacturing processes ,

of control or an operating mode.

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Claims (15)

R E V E N D I C A T I O N S   1. Transmission and, more particularly, double clutch transmission with at least two soul-transmissions, each having a primary shaft with several pigeons for the production of different ratios, characterized in that quta at least one pigeon on at least one of the primary trees   (1; 45) soul-transmissions (A, B), wind combine several reports.   2. Transmission according to claim 1, characterized in that each pigeon (2, 3) of the primary shaft of the first soul-transmission is associated with several reports.   3. Transmission according to claim 2, characterized in that two   pigeons (2, 3) wind planned to carry out each two reports.   4. Transmission according to any one of the claims   precedents, characterized in that a pigeon acting as a pigeon   intermediate, is intended for a reverse market.   5. Transmission according to claim 4, characterized in that the crazy pigeon (4) of the lowest speed is provided to act as a pigeon   intermediate for the reverse market.   6. Transmission according to any one of the claims   precedents, characterized in that the madest pigeon (4) of the lowest speed and the mad pigeon of the highest speed, on the transmission, can be   snapped in using a common sliding sleeve (8).   7. Transmission according to any one of the claims   precedents, characterized in that the mad pigeon (6) of the intermediate speed multiplied and the reverse pigeon (7), on the soul-transmission, can   be engaged using a common sliding sleeve.   8. Transmission according to any one of claims   precedents, characterized in that the primary tree (l) is coupled to the mad pigeon   of the slowest speed through a pigeon.   9. Transmission according to claim 8, characterized in that the crazy pigeon (22) is engaged with the reverse pigeon (24), which, when 8 2837251   is engaged, is in rigid connection with a tree, so as to be able   order a differential through a pigeon.   10. Transmission according to claim 8 or 9, characterized in that a second pigeon (28) engaged with the differential (27) is in rigid connection with a shaft.   11. Transmission according to any one of the claims   precedents, characterized in that, on the soul-transmission, the pigeons (42, 43) associated with the two speeds can be controlled by a common pigeon on the primary tree.   12. Transmission according to claim 11, characterized in that on the sub-transmission (A), a crazy pigeon corresponding to the upper ratio of the soul-transmission is mounted on the same shaft (46) as the crazy pigeon   correspond to the lower speed of soul-transmission (A).   13. Transmission according to claim 12, characterized in that the crazy pigeon (47) of the lower speed on the soul-transmission (A)   simultaneously function as an intermediate pigeon for reverse.   14. Transmission according to any one of claims   precedents, characterized in that, when the soul-transmission (A) comprises several forward ratios, the same pigeon on the primary shaft is   associated with normal starting speed (2 = A) and reverse gear (R).   15. Transmission according to claim 14, characterized in that an all-terrain or maneuvering speed (1 = K) is provided on the transmission