KR20140049337A - Shifting apparatus for dual clutch transmission - Google Patents

Abstract

A dual clutch transmission includes a first counter shaft and a second counter shaft and shifts gears by moving a synchronizer. The dual clutch transmission includes a first barrel cam for operating a first shift fork mounted on a first fork rod adjacent to the first counter shaft, a second barrel cam for operating a second shift fork mounted on a second fork rod adjacent to the second counter shaft, and a cam driving unit which moves the first and second shift forks by selectively operating the first and second barrel cams.

Description

[0001] SHIFTING APPARATUS FOR DUAL CLUTCH TRANSMISSION [0002]

The present invention relates to a dual clutch transmission, and more particularly, to a dual clutch transmission capable of simplifying a structure and improving response speed.

The dual clutch transmission has two clutches unlike the conventional single plate clutch transmission system. As one example, a transmission system designed to form a separate transmission system that allows one clutch to engage the odd-numbered gear and the other to interlock the even-numbered gears, is easy to operate, has low power loss, It is widely used due to its rapid advantages.

Assuming that the dual clutch transmission is shifted from the first stage to the sixth stage, if the first clutch is running in the first stage, the second clutch may be waiting in a state ready for shifting to the second stage or ready have. If the power of the first clutch is cut off and the power is connected to the second clutch for shifting, the two-speed shifting can be achieved only by the clutch movement, and the shifting process after the power is interrupted due to the clutch can be omitted.

The third gear connected to the first clutch can be engaged with the output shaft or prepared for engagement and the power shaft is switched from the first clutch to the second clutch so that the three-stage drive immediately starts There is a number.

In general, the shifting of the dual clutch transmission can be achieved by moving the shift fork holding the synchronizer disposed between the gears of the respective stages and selecting the gear ratio of the desired gear stage. For example, the conventional shift fork is mounted on a fork rod so as to be linearly movable along an axial direction, and is configured to be linearly moved by a barrel cam rotated by a driving motor.

In this connection, a "shift device of a dual clutch transmission" is disclosed in Japanese Patent Registration No. 10-1034890. The shift device includes a first input shaft and a second input shaft which are connected to the first clutch and the second clutch, respectively. The two input shafts are suitably provided with drive gears for the first to seventh gears, A counter shaft and a second counter shaft are provided with driven gears engaging the drive gears.

Approximately four synchronizers are provided between driven gears and one barrel cam is provided adjacent to the fork rod to operate four shift forks for four synchronizers. The shift fork includes a follow pin, and the shift fork can be positioned at the right, left, or intermediate position as the follow pin moves along the cam groove of the barrel cam.

The shifting device shifts from the first stage to the seventh stage. The shift forks from the fifth stage to the seventh stage in the section shifted from the first stage to the third stage maintain the neutral (N) The shift fork from the first stage to the third stage also maintains the neutral (N). That is, when one barrel cam is used, the follow pin of the shift fork is stopped at the intermediate position of the cam groove, and generally half of the entire circumference is resting in the resting period.

The long idle period means that the cam structure becomes complicated and it means that the diameter and weight of the barrel cam naturally increase because the cam groove of the barrel cam can not form a steep gradient of the speed change section. As a result, the increase in the diameter of the barrel cam increases the space of the barrel cam in the transmission, which may hinder the compact design. The increase in weight means that the inertia moment of the barrel cam increases, The cost of the system increases.

The present invention provides a dual clutch transmission capable of reducing the space and weight occupied by the barrel cam to realize a compact design and a fast reaction speed.

The present invention provides a dual clutch transmission capable of achieving a simple structure, easy shift control, and cost reduction.

According to a preferred embodiment of the present invention, a dual clutch transmission including a first counter shaft and a second counter shaft for shifting the synchronizer to implement a shift, A first barrel cam for actuating a first shift fork mounted on a first fork rod adjacent a counter axis, a second barrel cam for actuating a second shift fork mounted on a second fork rod adjacent to the second counter axis, And a cam driver for selectively operating the first and second barrel cams to move the first and second shift forks.

The counter shaft is axially connected to the input shaft of the dual clutch by gearing, and may include at least two or more of the first counter shaft and the second counter shaft in the present invention. A driven gear of a gear set having a different gear ratio is rotatably mounted on the counter shaft so that the driven gear can transmit the power to the output shaft by coupling with the adjacent synchronizer.

A first fork rod or fork rail capable of sliding movement of the first shift fork at a position adjacent to the first counter shaft may be provided. At least one first shift fork can be mounted on the first fork rod, which can be the same as at least one second shift fork can be mounted on the second fork rod.

The first shift fork may include a first interlock pin and the first interlock pin may remain engaged with the cam groove of the adjacent first barrel cam. The second shift fork may also include a second interlock pin and the second interlock pin may remain engaged with the cam groove of the adjacent second barrel cam.

As the first or second barrel cam rotates, the shift fork moves laterally along the fork rod and can couple the synchronizer with the desired driven gear.

In the present invention, the barrel cams can be independently provided according to the fork rod or the shift fork, respectively, and the barrel cam does not need to form unnecessary idle sections in the cam groove by controlling only the necessary movement of the shift fork. Further, since the cam groove can be formed in a simple manner even in a small diameter, it is possible to sufficiently secure a space capable of gently maintaining a tilted slope in the shifting section of the cam groove.

In addition, since the barrel cam can be independently arranged and the diameter of the barrel cam can be reduced, the space occupied by the barrel cam can be significantly reduced, and the inertia moment of the barrel cam can be reduced, The reaction rate and agility can be improved.

The dual clutch transmission of the present invention can realize a compact design and a fast reaction speed by reducing the space and weight occupied by the barrel cam.

The dual clutch transmission according to the present invention can achieve a simple structure, easy shift control, and cost reduction.

FIG. 1 is a configuration diagram for explaining a dual clutch configuration according to the present invention.
Fig. 2 is an exploded perspective view for explaining a speed change device in the dual clutch of Fig. 1; Fig.
Fig. 3 is a view showing an example of a cam groove that can be formed in the barrel cam in the transmission of Fig. 1. Fig.
4 is a view showing an example of a cam groove that can be formed in a barrel cam in a transmission according to another embodiment of the present invention.
5 is a view for explaining a cam driving unit of a transmission according to another embodiment of the present invention.
6 is a side view for explaining the switch unit of FIG.
FIG. 7 is a side view for explaining a switch portion of the transmission according to another embodiment of the present invention, which is similar to the switch portion of FIG. 6;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments. For reference, the same numbers in this description refer to substantially the same elements and can be described with reference to the contents described in the other drawings under the above-mentioned rules, and the contents which are judged to be obvious to the person skilled in the art or repeated can be omitted.

1 is an exploded perspective view for explaining a speed change device in the dual clutch of FIG. 1, and FIG. 3 is an exploded perspective view of the dual clutch shown in FIG. Fig. 2 is a view showing an example of a cam groove that can be formed in the cam groove.

1 to 3, a dual clutch device 100 according to the present invention includes a first clutch 112, a second clutch 114, a first input shaft 120, a second input shaft 130, A plurality of driven gears G1 to G8 corresponding to the driving gears, synchronizers S1 to S4 and synchronizer (synchronizing devices) S1 to S4 corresponding to the driving gears D1 to D8, the first counter shaft 140, the second counter shaft 150, S1 to S4) to adjust the shifting speed. The shift device 200 includes a first fork rod 160, a second fork rod 170, first shift forks 252 and 254, second shift forks 256 and 258, a first barrel cam 210 The second barrel cam 230, and the cam driving units 220 and 240. [

The clutch housing 110 accommodating the first clutch 112 and the second clutch 114 is connected to the engine and is capable of transmitting power to the first clutch 112 or the second clutch 114 Can be connected. The first clutch 112 is connected to the first input shaft 120 and is rotatable together with the driving gears D1, D3, D5 and D7. The second clutch C1 is connected to the second input shaft 120, D2, D4, D6, and D8, and may rotate together with the other driving gears D2, D4, D6, and D8.

The type, shape, and binding method between the first clutch 112, the second clutch 114, and the clutch housing 110 do not limit the present invention, and the types, shapes, and binding methods of the clutch and clutch housing Clutch structures and other replaceable power transmission structures. For example, the clutches may be operated by conventional hydraulic equipment and may transmit the rotational force of the engine to the first input shaft 120 or the second input shaft 130.

As described above, the first input shaft 120 is connected to the first clutch 112 to receive the rotational force generated in the engine. The second input shaft 130 is concentric with the first input shaft 120 and is connected to the second clutch 114 to receive the rotational force generated by the engine. For this, the second input shaft 130 may be hollow and the first input shaft 120 may be disposed along the inner axis of the second input shaft 130.

A plurality of driving gears D1 to D8 are provided on the first input shaft 120 and the second input shaft 130 and can be coupled to the driven gears G1 to G8 described later at different gear ratios. More specifically, among the plurality of driving gears, the Hall device driving gears D1, D3, D5, and D7 may be provided on the first input shaft 120, and the even numbered driving gears D2, D4, D6, 2 input shaft 130, as shown in FIG. Of course, in some cases, the arrangement of the drive gears may be variously changed, and even-numbered drive gears may be provided on the first input shaft 120 located therein.

The first counter shaft 140 is disposed adjacent to the first input shaft 120 and is parallel to the first input shaft 120. G5, G2, and G6 of the driven gears are freely rotatably connected to the first counter shaft 140 in correspondence with the drive gears, and engaged with the corresponding drive gears D1, D5, D2, can do.

In contrast, the second counter shaft 150 is disposed adjacent to the second input shaft 130 and parallel to the second input shaft 130. G3, G7, G4 and G8 of the driven gears are freely rotatably connected to the second counter shaft 150 and can rotate together with the corresponding drive gears D3, D7, D4 and D8 during engine operation.

The driven gears (G1 to G8) are located adjacent to the synchronizers (S1 to S4) at one input shaft. The driven gears G1 to G8 may be provided on both sides of the synchronizers S1 to S4 or may be provided on one side. For example, the sleeves and the like of the synchronizers S1 to S4 are coupled to the counter shaft by spline coupling and are movable in the axial direction. When the synchronizers S1 to S4 are brought into close contact with one of the driven gears, the power can be transmitted through the engaged driven gear and the driven gear, and the counter shaft can transmit power through the other output shaft. The structure of a specific synchronizer can refer to a conventional structure.

In this embodiment, G1, G5, G2 and G6 of the plurality of driven gears G1 to G8 are freely rotatable on the first counter shaft 140, and the remaining driven gears G3, G7, G4, And is freely rotatably mounted on the counter shaft 150.

A first fork rod 160 is provided adjacent to the first counter shaft 140 and first shift forks 252 and 254 are slidably mounted to the first fork rod 160. One of the first shift forks 252 is provided between the driven gears G1 and G5 for the first and fifth stages and the other gear 254 is provided between the driven gears G2 and G6 for the second and sixth stages .

The first shift forks 252 and 254 include first interlock pins 253 and 255 respectively and the first interlock pins 253 and 255 are connected to the first cam groove 212 And 214, respectively. Accordingly, as the first barrel cam 210 rotates by the first driving motor 220, the first interlock pins 253 and 255 move along the first cam grooves 212 and 214, The forks 252 and 254 can be moved left and right. The first shift forks 252 and 254 couple the first and second synchronizers S1 and S2 to the driven gears G1 and G2 in the first stage and drive the first synchronizer S1 in the second stage and thereafter, The second synchronizer S2 can be kept in close contact with the driven gear G2 while separating the driven gear from the driven gear G1. Conversely, the shift can be maintained while the first and second synchronizers S1 and S2 are in close contact with and separated from the driven gears G5 and G6 in the 5th and 6th steps.

A second fork rod 170 is provided adjacent the second counter shaft 150, opposite the first fork rod 160. Two second shift forks 256 and 258 are slidably mounted on the second fork rod 170 as well. One of the second shift forks 256 is provided between the driven gears G3 and G7 for the third and seventh stages and the other 258 is provided between the driven gears G4 and G8 for the fourth and eighth stages .

The second shift forks 256 and 258 include second interlock pins 257 and 259 respectively and the second interlock pins 257 and 259 include a second cam groove 232 formed in the second barrel cam 230 , 234, respectively. As the second barrel cam 230 is rotated by the second drive motor 240, the respective second interlock pins 257 and 259 move along the second cam grooves 232 and 234 and the second shift fork 256, and 258 can be moved to the left and right. The second shift forks 256 and 258 can bind the third synchronizer S3 to the driven gear G3 in the second two-stage section. After the second gear section, the driven gear G2 and the second synchronizer S2 are disengaged , And the fourth synchronizer S4 to the driven gear G4. As a result, the third and fourth synchronizers S3 and S4 can be coupled to the driven gears G3 and G4 in the third step, and the third synchronizer S3 is separated from the driven gear G3 in the fourth step and thereafter Or may remain intact. Of course, the fourth synchronizer S4 can be kept in close contact with the driven gear G4.

As the first synchronizer S1 is shifted sequentially from the first stage to the fourth stage, the first synchronizer S1 is moved to the right (R) of the driven gear, the middle (N) In the seventh stage, the neutral (N) may be maintained, and then the seventh stage or the first stage may be prepared. Even if only the first synchronizer S1 is seen, there is no rest period in which the interlock pin is kept long in the first cam grooves 212, 214 of the first barrel cam 210, and the diameter of the first barrel cam 210 The inclination of the inclined section for changing the position in the first cam grooves 212 and 214 can be formed more smoothly even if the same diameter of the barrel cam is maintained and the interference during the speed change can be kept to a minimum, It is also possible to increase the transmission speed more quickly. These characteristics can be maintained almost the same in the second to fourth synchronizers S2 to S4.

4 is a view showing an example of a cam groove that can be formed in a barrel cam in a transmission according to another embodiment of the present invention.

Referring to FIG. 4, both ends of the first cam grooves 312 and 314 are separated to provide a path in which both ends are broken. The cam grooves 312 and 314 of the cam groove 212 and 214 of FIG. 3 are provided in such a manner that both ends of the cam groove 212 and 214 of the cam groove 212 and 214 of FIG. And the synchronizer can be brought into close contact with the right or left side only when it is rotated in the opposite direction.

In this case, the drive motor can move the interlock pin to a desired position while rotating the barrel cam forward or reverse. The cam grooves 312 and 314 can be extended to an angle range of 360 degrees or more formed on the outer surface of the barrel cam and the first cam grooves 312 and 314 can be extended within a range in which the cam grooves do not overlap each other, 314 may be longer. Compared with the cam grooves 212 and 214 shown in Fig. 3, the angle cam groove can be formed in a longer path or a larger angular range in the barrel cam of the diameter.

Further, the inclination of the inclined section for changing the position of the interlock pin in the first cam grooves 312, 314 can be formed more gently, so that the interference during the shift can be kept to a minimum, have. That is, the structure of the cam grooves 312 and 314 shown in Fig. 4 can be achieved by a separate barrel cam for each counter shaft. As a result, a sufficient cam groove path can be secured even with a small diameter, Miniaturization and weight reduction of the barrel cam, quick rotation and precise control, reduction of the driving motor cost, and so on.

5 is a view for explaining a cam driving unit of the transmission according to another embodiment of the present invention, and FIG. 6 is a side view for explaining the switch unit of FIG.

5 and 6, the transmission includes one drive motor 460 and a switch portion. One of the drive motors 460 may be selectively connected to the first barrel cam 410 or the second barrel cam 410 using the switch portion. (Not shown).

For reference, in the present embodiment, the first barrel cam 410 or the second barrel cam 430 is selectively operated according to the rotation angle by using a toothless gear having no gear teeth partially, A switch portion for selectively operating some of the two or more barrel cams in accordance with the rotational direction, such as a one-way clutch, may be provided.

Referring again to the drawings, the cam drive portion includes one drive motor 460 for the first and second barrel cams 410, 430 and a switch portion for transmitting the power of the drive motor 460 to one of the two barrel cams , The switch unit includes a first select gear 420 mounted on the shaft of the first barrel cam 410, a second select gear 440 mounted on the shaft of the second barrel cam 430, And a switching gear 450 disposed between the gears 420 and 440.

The switching gear 450 is formed with gear teeth at an angle of about 180 degrees and gear teeth are formed at an opposite 180 degree angle. Thus, it can engage with the first select gear 420 at 180 degree rotation and with the second select gear 440 at 180 degree rotation.

The switching gear 450 includes a gear surface and a toothless surface. The switching gear 450 can be meshed with the first or second select gear by the gear face, and can be driven and separated from the first or second select gear by the dovetail face. Here, the drivingly separated state includes a state in which the power can not be physically separated and can not transmit power even though it is physically connected. The first and second selection gears 420 and 440 may be exclusively connected to the switching gear 450 by a combination of a gear surface and a toothless surface. In some cases, they may form partly moving sections.

FIG. 7 is a side view for explaining a switch portion of the transmission according to another embodiment of the present invention, which is similar to the switch portion of FIG. 6;

7, the switch portion may include a switching gear 550 disposed between the first select gear 520, the second select gear 540, and the first and second select gears 520, 540 have. The switching gear 550 provides a gear face at which the gear teeth are formed at an angle of about 180 degrees and a zero tooth face at which the gear teeth are removed at an opposite 180 degree angle.

The first select gear 520 and the second select gear 540 may further include stop teeth 522 and 542 including at least one Geneva gear face between the gear teeth. The gear teeth of the stop teeth 522 and 542 are maintained in a state of being in contact with the toothless surface and the first or second select gears 520 and 540 are maintained in the original state The rotation can be restrained. In addition, according to another embodiment, when the power from the switching gear 550 is interrupted, the selector gear may be caused to return to the neutral position of the barrel cam without stop.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It will be understood that the present invention can be changed.

100: dual clutch 200: transmission
210: first barrel cam 220: first drive motor
230: second barrel cam 240: fourth drive motor
212, 214: first cam groove 232, 234: second cam groove

Claims (10)

A dual clutch transmission device for shifting a synchronizer in a dual clutch including a first counter shaft and a second counter shaft to realize shifting,
A first barrel cam for actuating a first shift fork mounted on a first fork rod adjacent said first counter axis;
A second barrel cam for actuating a second shift fork mounted on a second fork rod adjacent said second counter axis; And
And a cam driver for selectively operating the first and second barrel cams to move the first and second shift forks. The method of claim 1,
Wherein at least one of the cam grooves formed in the first and second barrel cams has both ends connected to an outer surface of the first or second barrel cam. The method of claim 1,
Wherein at least one of the cam grooves formed in the first and second barrel cams has both ends separated from the outer surface of the first or second barrel cam. The method of claim 3,
Wherein at least one of the cam grooves in which both ends are separated is formed over an angular range of 360 degrees or more from the outer surface of the first or second barrel cam. The method of claim 1,
And the cam drive unit includes a first drive motor and a second drive motor for driving the first and second barrel cams, respectively. The method of claim 1,
And the cam driving unit includes a driving motor for the first and second barrel cams, and a switch unit transmitting power of the driving motor to one of the first and second barrel cams. The method according to claim 6,
And the switch unit transmits or interrupts power transmitted to the first or second barrel cam according to the rotational direction of the drive motor. The method according to claim 6,
The switch unit dual clutch transmission, characterized in that for transmitting or interrupting the power transmitted to the first or second barrel cam according to the rotation angle of the drive motor. 9. The method of claim 8,
The switch unit selectively transmits power to one of a first selection gear mounted to the shaft of the first barrel cam, a second selection gear mounted to the shaft of the second barrel cam, and one of the first and second selection gears. Including a switching gear,
The switching gear includes a gear surface meshing with the first and second selection gears and an inclined surface operatively separated from the first and second selection gears,
And the first and second selection gears are exclusively connected to the switching gear. 10. The method of claim 9,
Wherein a stop value including a geneva gear surface is provided between gear teeth of the first and second selectable gears while a rotation of the first or second select gear while the geneva gear surface is in contact with the non- And the second clutch is engaged.

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