KR101998075B1 - Torque convertor for vehicle - Google Patents

Abstract

The present invention discloses a torque converter for a vehicle which is provided with a lock-up clutch between an impeller and a turbine, and improves responsiveness when the lock-up clutch is operated.
A torque converter for a vehicle according to the present invention includes a front cover, an impeller rotatably coupled to a front cover, a turbine disposed at a position facing the impeller, a reactor positioned between the impeller and the turbine to change the flow of oil from the turbine to the impeller side, A lockup clutch for directly transmitting the driving force of the engine transmitted to the front cover to the transmission input shaft, and a local damper coupled to the turbine for absorbing shocks and vibrations acting in the rotating direction, the lockup clutch being provided to the impeller and the turbine And is installed in the core portion.

Description

[0001] Torque converter for vehicle [0002]

The present invention relates to a torque converter for a vehicle which is provided with a lock-up clutch between an impeller and a turbine, and improves responsiveness when the lock-up clutch is operated.

Generally, a torque converter is installed between a vehicle engine and a transmission, and uses a fluid to transmit the driving force of the engine to the transmission. The torque converter includes a rotating impeller that receives the driving force of the engine, a turbine that is rotated by the oil discharged from the impeller, and a reactor that increases the rate of torque change by directing the flow of oil flowing back to the impeller in the rotating direction of the impeller. Quot; stator ").

The torque converter is equipped with a lock-up clutch (also called a "damper clutch"), which is a means of directly connecting the engine to the transmission, as power transmission efficiency may be degraded if the load acting on the engine is increased. The lock-up clutch is disposed between the turbine and the front cover directly connected to the engine so that the rotational power of the engine can be directly transmitted to the transmission through the turbine.

This lockup clutch includes a piston which is axially movable on the turbine shaft. The piston is engaged with a friction material which is in friction contact with the front cover. The piston is fitted with a torsional damper capable of absorbing impact and vibration acting in the direction of rotation of the shaft when the friction material is engaged with the front cover.

The above-described local dampers are installed in the rotational direction with springs capable of absorbing the torsional torque when the lockup clutch is operated so that the driving force of the engine can be directly transmitted to the transmission through the turbine.

A conventional lockup clutch is installed between the front cover and the turbine. The torque converter equipped with such a lockup clutch has a difficulty in manufacturing an overall length, that is, an axial length, and making it compact.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a torque converter for a vehicle which can be manufactured compactly by reducing the total length of the torque converter.

Another object of the present invention is to provide a torque converter for a vehicle that can be manufactured compactly, while improving responsiveness with stable operation when the lockup clutch is operated and released.

In order to accomplish the above object, the present invention provides a turbine for a turbine, comprising: a front cover; an impeller coupled to the front cover to rotate together; a turbine disposed at a position facing the impeller; A lockup clutch for directly transmitting a driving force of an engine transmitted to the front cover to a transmission input shaft, and a clutch coupled to the turbine to absorb impact and vibration acting in a rotating direction, And a damper,

And the lockup clutch is provided in the core portion provided in the impeller and the turbine.

The lockup clutch includes a first support plate installed on the impeller side, a first friction plate installed on the first support plate and moving in a direction parallel to the shaft, a first friction plate installed on the turbine side, A second friction plate provided on the first friction plate and contacting the first friction plate and a second friction plate provided on the second support plate and moving in a direction parallel to the axis and closely contacting one surface of the first friction plate or the first support plate, Plate.

Preferably, the turbine is coupled to a shaft of the turbine and coupled to a piston moving in a direction parallel to the shaft by hydraulic pressure.

And the piston is disposed on the opposite side of the front cover with respect to the local damper.

Preferably, the local damper is coupled to the turbine and absorbs vibrations and shocks in the rotational direction, and then transmits the driving force to a spline hub connected to the transmission input shaft.

Wherein the spline hub includes a flange portion, a flange portion of which is partially extended in a radial direction with respect to an axis, or a flange portion that is bent in a direction parallel to the axis, and a piston, which is connected to a shaft portion of the turbine, And the turbine is moved to the impeller side by the reaction force of the flange portion.

And a lock-up clutch operating pressure chamber is disposed between the flange portion and the piston.

Preferably, the turbine is coupled to a plurality of compensating blades which protrude toward the front cover and are arranged at a plurality of intervals.

Preferably, the compensation blade is coupled along the circumferential direction about the rotation axis, and the surface of the compensation blade is bent to form a curved surface.

According to the present invention as described above, the lock-up clutch is installed between the impeller and the core portion of the turbine, thereby reducing the overall size of the torque converter and making it compact.

Further, according to the present invention, a compensating blade is installed on the surface of the turbine shell so that a force similar to a force for moving the turbine toward the impeller is applied, thereby maintaining the gap between the turbine and the impeller in the released state of the lockup clutch, And it is possible to improve the responsiveness when the releasing pressure of the lockup clutch acts.

FIG. 1 is a half sectional view of a torque converter cut to explain an embodiment of the present invention. FIG.
Fig. 2 is an exploded perspective view showing the main part of Fig. 1 in an exploded manner.
3 is a view for explaining the operation of locking up the lockup clutch applied to the torque converter of the present invention.
4 is a view for explaining the action of releasing the lock-up clutch applied to the torque converter of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

FIG. 1 is a half sectional view for explaining an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a torque converter in which the main part of FIG. 1 is exploded.

The torque converter of the embodiment of the present invention includes a front cover 1, an impeller 3, a turbine 5, a reactor 7, a lockup clutch 9, and a local damper 11.

The front cover 1 is connected to the crankshaft of the engine and rotates to receive the driving force. The impeller 3 is connected to the front cover 1 and rotates together with the front cover 1. The turbine (5) is disposed at a position facing the impeller (3) at regular intervals. The reactor 7 is positioned between the impeller 3 and the turbine 5 and serves to change the flow of the oil in the impeller 3 and the turbine 5 and is also referred to as a stator. And the lockup clutch 9 is used as a means for directly connecting the engine and the transmission and is disposed between the impeller 3 and the turbine 5. [ The local damper (11) is disposed between the turbine (5) and the spline hub (13) to absorb a twisting force acting in the rotating direction of the shaft and to attenuate vibration.

In the embodiment of the present invention, the lock-up clutch 9 is disposed in the core portion C where the impeller 3 and the turbine 5 face each other. The lockup clutch 9 may include a first support plate 15, a first friction plate 17, a second support plate 19, and a second friction plate 21 as an example. In the embodiment of the present invention, the first friction plate (17) and the second friction plate (21) can be frictionally contacted to one or both surfaces of the friction materials (23), respectively. The frictional contact of the friction material 23 causes the driving force of the engine to be transmitted directly from the impeller 3 to the turbine 5 or through the fluid returning between the impeller 3 and the turbine 5, (3) to the turbine (5).

The first support plate 15 is engaged with the core portion C of the impeller 3 and one surface of the first support plate 15 is disposed so as to be in surface contact with the friction material 23 described above. The first support plate 15 is partially bent to have a toothed shape, and the first friction plate 17 can be engaged. That is, the first friction plate 17 is engaged with the first support plate 15 so as to move in a direction parallel to the axis. The first friction plate 17 may be in close contact with one surface of the second support plate 19.

The second support plate 19 is disposed to be in contact with the core portion C of the turbine 5 and one surface of which is in contact with the friction material 23 coupled to the first friction plate 17. The second support plate 19 is partly bent to have a toothed shape, and the second friction plate 21 can be fitted and fitted. That is, the second friction plate 21 is coupled to the second support plate 19 so as to be movable in a direction parallel to the axis. The second friction plate 21 may be disposed between the first support plate 15 and the first friction plate 17 and may be in close contact with one surface of the first support plate 15 and the first friction plate 17 .

The local damper 11 is coupled to the shell side of the turbine 5 and transmits the driving force to the spline hub 13 while absorbing impact and vibration acting in the rotating direction.

On the other hand, a piston 25 is fixedly coupled to a shaft portion of the turbine 5 by a rivet or the like. The piston 25 can move in the direction parallel to the shaft, that is, in the direction toward the impeller 3 or in the opposite direction by the operating pressure or the releasing pressure of the hydraulic pressure. It is preferable that the piston 25 is disposed on the opposite side of the front cover 1 with respect to the local damper 11.

Meanwhile, the local damper 11 may be coupled to the turbine 5 to absorb the vibration and shock in the rotational direction, and may transmit the driving force to the spline hub 13 connected to the transmission input shaft.

As an example of the embodiment of the present invention, the spline hub 13 may include a flange portion 13a and a bending portion 13b. The flange portion 13a may be shaped to extend in the radial direction with respect to the axis in the spline hub 13. [ The bending portion 13b may extend in a direction parallel to the axis of the flange portion 13a. At this time, the bending portion 13b is preferably bent in the direction toward the turbine 5. [

The flange portion 13a and the bending portion 13b may be separate members and may be coupled to the local damper 11 and the spline hub 13.

On the other hand, the outer circumferential surface of the piston 25 is in close contact with the bending portion 13b, and the inner circumferential surface thereof can be disposed in close contact with the shaft portion of the spline hub 13. Therefore, the operating pressure chamber 27 can be formed between the flange portion 13a of the spline hub 13 and the piston 25. [ The operating pressure chamber 27 formed between the flange portion 13a of the spline hub 13 and the piston 25 is where the hydraulic pressure can act as the operating pressure when operating the lockup clutch 9. [ The piston 25 can move toward the impeller 3 together with the turbine 5 by the operating pressure acting in the operating pressure chamber 27. [ At this time, the flange portion 13a can act as a reaction force when the piston 25 moves.

On the other hand, the turbine 5 is coupled with a plurality of compensating blades 29 protruding in the direction toward the front cover 1. The compensating blades 29 can be spaced apart and arranged in a circumferential direction. The compensating blade 29 may serve to limit the movement of the turbine 5 toward the impeller 3 while rotating.

That is, the turbine 5 is rotated by the refluxing oil while generating a force to move toward the impeller 3 side. At this time, the compensating blade 29 rotates together with the turbine 5, and this force acts in reverse so that the rotating turbine 5 is always positioned away from the impeller 3. In order to achieve this purpose, the compensation blade 29 preferably has a curved surface with its side bent. It is preferable that the curved surface formed by the compensating blade 29 is curved in such a manner that the force of the turbine 5 moving to the opposite side of the impeller 3 acts when the turbine 5 rotates.

Therefore, even if the turbine 5 rotates at a high speed, the turbine 5 and the impeller 3 can be arranged in a state in which the turbine 5 and the impeller 3 are kept apart from each other when the operation pressure of the lockup clutch 9 is not applied.

The operation of the embodiment of the present invention will now be described.

3 is a state in which the operating pressure is controlled so that the lock-up clutch 9 is operated. When the lockup clutch 9 supplies the operating pressure to the operating pressure chamber 27 in the non-operating state, the piston 25 moves in the direction of the arrow indicated by A. Then, since the turbine 5 is engaged with the piston 25, the turbine 5 moves toward the impeller 3 side. At this time, the first support plate 15 coupled to the turbine 5 also moves together. Therefore, the first support plate 15, the first friction plate 17, the second friction plate 21, and the second support plate 19 are in close contact with each other with the friction material 23 interposed therebetween. Therefore, the lock-up clutch 9 is in an operating state. Then the driving force of the engine is directly transmitted to the spline hub 13 through the front cover 1, the impeller 3, the turbine 5, the lockup clutch 9, and the local damper 11. This state is that the driving force of the engine is directly transmitted to the transmission.

4 is a state in which the release pressure is controlled so that the lockup clutch 9 is released. When the lockup clutch 9 releases the operating pressure of the operating pressure chamber 27 in the operating state, the piston 25 moves in the direction of the arrow indicated by B, Then, the turbine 5 is coupled with the piston 25, and therefore moves toward the direction away from the impeller 3, that is, toward the front cover 1. At this time, the first support plate 15 coupled to the turbine 5 also moves together. Therefore, the first support plate 15, the first friction plate 17, the second friction plate 21, and the second support plate 19 are spaced apart from each other, and the lockup clutch 9 is inactivated . Then, the driving force of the engine is transmitted to the front cover 1 and the impeller 3. The driving force of the engine is transmitted to the turbine 5 side through the impeller 3 while the torque is converted by the oil circulating between the impeller 3 and the turbine 5. The driving force of the engine, which is transmitted to the turbine 5 side, is transmitted to the spline hub 13 through the local damper 11.

When the turbine 5 rotates in the non-operating state of the lockup clutch 9, the compensation blade 29 coupled to the turbine 5 also rotates together. The compensating blade 29 is urged by the fluid in a direction away from the impeller 3. Therefore, the turbine 5 maintains the state in which the force acting on the compensation blade 29 compensates the force acting inside the turbine blade and moves toward the front cover 1 side.

Therefore, the present invention can improve the responsiveness to the release pressure of the lock-up clutch 9. [ The present invention also makes it possible to compact the torque converter by arranging the lock-up clutch 9 in the core portion C provided between the impeller 3 and the turbine 5. [

3 and 4, the symbols t1 and t2 are the distances between the impeller 3 and the turbine 5, the interval t1 is the state in which the lockup clutch 9 is operated, (9) is released. Here, the interval t2 when the lockup clutch 9 is released is larger than the interval t1 when the lockup clutch 9 is operated.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

1. Front cover, 3. Impeller,
5. Turbine, 7. Reactor,
9. Lock-up clutch, 11. Local damper,
13. Spline hub,
13a. Flange portion, 13b. The bending part,
15. a first support plate, 17. a first friction plate,
19. a second support plate, 21. a second friction plate,
23. Friction material, 25. Piston,
27. Operating pressure chamber, 29. Compensating blade,
C. Core portion

Claims (9)

Front cover,
An impeller coupled to the front cover and rotating together,
A turbine disposed at a position facing the impeller,
A reactor positioned between the impeller and the turbine to convert the flow of oil from the turbine to the impeller side,
A lockup clutch for directly transmitting the driving force of the engine transmitted to the front cover to the transmission input shaft, and
And a local damper coupled to the turbine and absorbing impact and vibration acting in a rotating direction,
Wherein the lockup clutch is installed in the core portion of the impeller and the turbine,
The local damper is coupled to the turbine and absorbs vibrations and shocks in a rotating direction, and transmits a driving force to a spline hub connected to a transmission input shaft.
The spline hub
A flange portion in which a portion extends or is radially extended with respect to the axis,
Wherein the flange portion includes a bending portion bent in a direction parallel to the axis,
The piston connected to the shaft portion of the turbine
And the turbine is moved to the impeller side by a reaction force of the flange portion, the torque converter being disposed at one side of the flange portion. The method according to claim 1,
The lockup clutch
A first support plate provided on the impeller side,
A first friction plate installed on the first support plate and moving in a direction parallel to the axis,
A second support plate installed on the turbine side and contacting the first friction plate as the turbine moves in the axial direction,
A second friction plate provided on the second support plate and moving in a direction parallel to the axis, the second friction plate being in close contact with one surface of the first friction plate or the first support plate,
And a torque converter for a vehicle. The method according to claim 1,
The turbine
And a piston which is coupled to the shaft portion and moves in a direction parallel to the shaft by hydraulic pressure is engaged. The method of claim 3,
The piston
And the torque converter is disposed on the opposite side of the front cover with respect to the local damper. delete delete The method according to claim 1,
The flange portion and the piston
And a lock-up clutch operating pressure chamber is disposed therebetween. The method according to claim 1,
The turbine
And a plurality of compensating blades protruding toward the front cover and arranged in spaced relation to each other are coupled. The method of claim 8,
The compensation blade
Wherein the torque converter is coupled along a circumferential direction about a rotational axis and has a curved surface formed by bending a surface thereof.

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