WO2014092307A1

WO2014092307A1 - Torque converter for vehicle

Info

Publication number: WO2014092307A1
Application number: PCT/KR2013/008512
Authority: WO
Inventors: 이성은; 김진문; 장재덕; 주인식
Original assignee: 한국파워트레인 주식회사
Priority date: 2012-12-12
Filing date: 2013-09-24
Publication date: 2014-06-19
Also published as: WO2014092269A1; KR20140076316A

Abstract

Disclosed is a torque converter, for a vehicle, enhancing productivity by reducing the number of parts in a section in which a reactor and an one-way clutch are coupled. A torque converter for a vehicle according to the present invention comprises: an impeller; a turbine; a reactor; and an one-way clutch arranged in the inner circumferential surface of the reactor, wherein the one-way clutch comprises: an outer race arranged on the inner circumferential surface of the reactor; an inner race arranged so as to be distanced by a set distance from the inner circumferential surface of the outer race; a bearing fixing member arranged in between the outer and inner races; and a plurality of bearings arranged in the bearing fixing member along the circumference thereof, and the bearing fixing member comprises: a fixing part having a plurality of grooves in which a plurality of bearings are arranged in the circumferential direction; an extended part extending from the fixed part and bent at a right angle therefrom with respect to the rotational axis thereof; and movement restricting parts extending radially, with respect to the rotational axis, from the extended part so as to restrict movement in the direction of the axis.

Description

Automotive Torque Converter

The present invention relates to a torque converter for a vehicle that improves productivity by reducing the number of parts in a part where the reactor and the one-way clutch are coupled to each other.

In general, the torque converter is installed between the engine of the vehicle and the transmission to transmit the driving force of the engine to the transmission using a fluid. Such a torque converter receives a driving force of an engine, a turbine that rotates by an impeller that is rotated by oil discharged from an impeller, and a reactor that increases the rate of change of torque by directing the flow of oil flowing back to the impeller in a direction of rotation of the impeller ('stator' "Also".

In general, torque converters are equipped with a lock-up clutch (also called a 'damper clutch'), which is a means of connecting directly between the engine and the transmission, as the load on the engine may decrease power transmission efficiency. The lockup clutch is disposed between the turbine and the front cover that is connected to the engine so that the rotational power of the engine can be transmitted directly to the turbine.

This lockup clutch includes a piston that is axially coupled to the turbine shaft. And the piston is coupled to the friction material in friction contact with the front cover. And when the friction material coupled to the piston is coupled to the front cover is coupled a torsional damper (Torsional damper) that can absorb the shock and vibration acting in the rotational direction of the shaft.

In the reactor described above, the one-way clutch is disposed on the inner circumferential surface (the rotation center side). Wenway clutches include inner races, multiple bearings and outer races from the center of rotation. That is, since the outer race of the one-way clutch is coupled to the inner circumferential surface of the reactor, the reactor is installed in a structure capable of rotating only in one direction. And a retainer for preventing the wenway clutch from moving in the axial direction is disposed on one side of the wenway clutch.

Such a structure that restricts the movement of the conventional one-way clutch in the axial direction includes a retainer, so there is a problem that the number of parts is increased and assembly performance and productivity may be degraded.

In addition, the forging process and carburizing heat treatment when the outer race is assembled, but this is a factor to increase the production cost.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a torque converter for a vehicle that improves assembly and productivity by reducing the number of parts.

In addition, the present invention is to provide a vehicle torque converter that can reduce the cost when the outer race is processed and assembled.

The vehicle torque converter for achieving the object of the present invention, the front cover, the impeller coupled to the front cover to rotate, the turbine disposed in a position facing the impeller to rotate together with the rotation of the impeller, the impeller and Located between the turbine to change the flow of oil from the turbine to the impeller side, a one-way clutch disposed on the center of rotation axis of the reactor to rotate the reactor only in one direction, the front cover and the turbine can be directly connected A lock up clutch, and a tonic damper coupled to the lock up clutch and having springs disposed in the circumferential direction of the shaft to absorb vibration and shock in the rotational direction,

The wenway clutch is an outer race disposed on the inner circumferential surface of the reactor, an inner race disposed at a predetermined distance from the inner circumferential surface of the outer race, a bearing fixing member disposed between the outer race and the inner race, and the bearing It includes a plurality of bearings disposed in the circumferential direction in the fixed member,

The bearing fixing member is disposed in the circumferential direction and provided with a plurality of grooves in which the bearing is disposed, an extension part which is bent and extended in a direction perpendicular to the rotation axis in the fixing part, and the extension part in a radial direction with respect to the rotation axis. It extends to provide a vehicle torque converter including a movement limiting unit for limiting movement in the axial direction.

Preferably, the movement limiting portion is provided at intervals in which a portion of the extension is processed by punching to be symmetrical in the radial direction with respect to the axis of rotation.

The movement limiting unit is preferably disposed on one side of the reactor and the inner race.

Preferably, a bush is disposed between the movement limiting portion and the inner race.

The outer race is preferably processed by press working and high frequency heat treatment.

The present invention is used in the one-way clutch to limit the movement of the one-way clutch in the axial direction by providing a movement limiting portion extending a portion of the bearing fixing member for fixing the bearings arranged in the circumferential direction By eliminating the retainer, which is a separate part, productivity can be improved by reducing the number of parts.

In addition, the present invention has the effect of reducing the cost by manufacturing the outer race by the high-frequency heat treatment method of the press work.

1 is a cross-sectional view of a torque converter for explaining an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the main part of the vehicle torque converter shown in FIG.

3 is an enlarged view of the one-way clutch of FIG. 2.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

FIG. 1 is a half sectional view of a vehicle torque converter cut in an axial direction to explain an embodiment of the present invention.

The torque converter according to the embodiment of the present invention is disposed at a position facing the impeller 6 and the impeller 6, which are connected to the crankshaft of the engine to rotate and the front cover 4, which is connected to the front cover 4 to rotate together. Turbine (8) and a reactor (also referred to as a "stator") located between the impeller (6) and the turbine (8) to divert the flow of oil from the turbine (8) to the impeller (6). Include. The reactor 10 delivering oil to the impeller 6 side has the same center of rotation as the front cover 4. And the torque converter of the embodiment of the present invention is provided with a lockup clutch 14 as a means of directly connecting the engine and the transmission. The lockup clutch 14 is arranged between the front cover 4 and the turbine 8.

The lockup clutch 14 is formed in a substantially disk shape and has a piston 16 that can move in the axial direction.

And the torsional damper 20 is coupled to the lockup clutch 14.

The torsional damper 20 transmits the driving force transmitted through the lockup clutch 14 to the turbine 8 to absorb the torsional force acting in the rotational direction of the shaft and to damp vibration.

The lockup clutch 14 described above comprises a friction plate 33 disposed between the front cover 4 and the piston 16. The friction plate 33 is coupled to the friction material 35 on both sides. Therefore, when the piston 16 moves in the direction toward the front cover 4 by the hydraulic pressure, the lockup clutch 14 is brought into close contact with the front cover 4 and the piston 16 and the front cover 4. The transmitted driving force may be transmitted to the friction plate 33.

1, the drive plate 37, the outside spring 39, the first cover plate 41, the second cover plate 43, and the inside spring 45 are provided on the torsional damper 20. ) And driven plate 47.

The drive plate 37 may be engaged with the friction plate 33 of the lockup clutch 14 to receive the driving force of the friction plate 33.

The outside spring 39 is arranged in a circumferential direction with respect to the rotation center and is elastically supported by the drive plate 37. It is preferable that this outside spring 39 consists of a compression coil spring.

The first cover plate 41 and the second cover plate 43 may be disposed to surround the outside spring 39 and elastically support the outside spring 39. The first cover plate 41 and the second cover plate 43 may be disposed to face each other. That is, the driving force of the drive plate 37 may be transmitted to the first cover plate 41 and the second cover plate 43 through the outside spring 39. In this process, the outside spring 39 may absorb vibration and shock in the rotational direction.

The inside spring 45 is supported by the first cover plate 41 and the second cover plate 43 described above and disposed in the circumferential direction. And the inside spring 45 is preferably disposed on the inner circumferential side of the outside spring 39 around the rotation axis.

The inside spring 45 is elastically supported by the driven plate 47. That is, the driving force transmitted to the first cover plate 41 and the second cover plate 43 is transmitted to the driven plate 47 through the inside spring 45. In this process, the vibration and impact of the inside spring 45 in the rotational direction can be absorbed again.

The driven plate 47 is connected to the spline hub 49. The spline hub 49 can transmit the driving force of the engine to the transmission.

On the other hand, the one-way clutch 51 is coupled to the central axis of rotation of the reactor 10. The one-way clutch 51 serves to rotate the reactor 10 only in one direction.

The one-way clutch 51 includes an outer race 53, an inner race 55, a bearing fixing member 57, and a bearing 59.

The outer race 53 is disposed on the inner circumferential surface of the reactor 10. The inner race 55 is disposed at a position away from the inner circumferential surface of the outer race 53 by a predetermined distance.

The bearing fixing member 57 is disposed between the outer race 53 and the inner race 55. The bearing fixing member 57 is provided with a plurality of grooves along the circumferential direction, and the bearing 59 is disposed in this groove.

The aforementioned bearing fixing member 57 includes a fixing part 57a, an extension part 57b, and a movement limiting part 57c.

The fixing part 57a is provided in a band shape having a predetermined thickness in the circumferential direction with respect to the rotation axis. In the fixing portion 57a, grooves into which the above-described bearing 59 is fitted are provided at regular intervals in the circumferential direction so that the bearing 59 is disposed.

The extension part 57b is bent and extended in a direction perpendicular to the rotation axis in the fixing part 57a. That is, the extension portion 57b is disposed in a circle in a direction perpendicular to the rotation axis. And the movement limiting portion 57c extends in the radial direction with respect to the rotation axis in the extension portion 57b to limit the movement in the axial direction. The movement limiting portion 57c may be processed by punching a portion of the extension 57b. The movement limiting portion 57c is arranged in a direction in which the four are symmetrical and has a shape that protrudes radially larger than the outer circumferential surface of the fixing portion 57a.

The movement limiting part 57c is disposed on the side of the reactor 10 and the inner race 55. That is, the movement limiting portion 57c serves to limit the movement of the one-way clutch 51 in the axial direction.

In addition, a bush 61 may be disposed between the movement limiting portion 57c and the inner race 55.

On the other hand, the outer race 53 is preferably processed by the press working and high frequency heat treatment method. The processing method of such an outer race 53 has the effect of reducing the cost.

Referring to Figures 1 to 3 the operation of the embodiment of the present invention made as described above is as follows.

When the lockup clutch 14 is not operated, the driving force of the engine is the front cover 4, the impeller 6, the turbine 8, the first cover plate 41 and the second cover plate 43, and the inner spring. The driving force is transmitted to the transmission through the 45, the driven plate 47, and the spline hub 49. In this process, the inside spring 45 may absorb vibration and shock in the rotational direction.

When the lockup clutch 14 is operated, the piston 16 moves to the front cover 4 side by hydraulic pressure. Then, the friction materials 35 provided on both sides of the friction plate 33 are in close contact with the inside of the front cover 4 and one side of the piston 16, and the driving force of the front cover 4 is transmitted to the friction plate 33. The driving force transmitted to the friction plate 33 is transmitted to the drive plate 37. The drive plate 37 transmits a driving force to the first cover plate 41 and the second cover plate 43 while compressing the outside spring 39. In this process, the outside spring 39 absorbs vibrations and shocks in the rotation direction with respect to the rotation center.

Subsequently, the first cover plate 41 and the second cover plate 43 compress the inside spring 45. Then, the inside spring 45 is compressed to transmit a driving force to the driven plate 47. In this process, the inside spring 45 absorbs vibration and shock in the rotational direction based on the rotational center.

The driving force transmitted to the driven plate 47 is transmitted to the transmission through the spline hub 49.

As such, when the vehicle torque converter of the embodiment of the present invention operates, the movement limiting portion 57c of the bearing fixing member 57 is restricted in the support axial direction to the outer race 53.

Therefore, the present invention can omit the retainer, which is a separate part that restricts the movement of the one-way clutch 51 in the axial direction, thereby reducing the number of parts and improving productivity. In particular, since the present invention processes the outer race 53 by the press working and high frequency heat treatment method, it is possible to reduce the cost by facilitating the manufacturing process.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

Claims

Front cover,

An impeller coupled to the front cover and rotating;

A turbine disposed at a position facing the impeller and rotating together with the rotation of the impeller,

A reactor located between the impeller and the turbine to change the flow of oil from the turbine to the impeller side,

One-way clutch coupled to the rotation axis of the reactor to rotate the reactor only in one direction,

A lockup clutch capable of directly connecting the front cover and the turbine, and

Comprising a spring damper coupled to the lock-up clutch and disposed in the circumferential direction of the shaft to absorb vibration and shock in the rotation direction,

The Wenway clutch

An outer race disposed on an inner circumferential surface of the reactor,

An inner race disposed at a predetermined distance from an inner circumference of the outer race,

A bearing fixing member disposed between the outer race and the inner race, and

It includes a plurality of bearings disposed along the circumferential direction in the bearing fixing member,

The bearing fixing member

A fixing part disposed in the circumferential direction and provided with a plurality of grooves in which the bearing is disposed;

And an extension part that is bent and extended in a direction perpendicular to the rotation axis in the fixed part, and a movement limiting part that extends in the radial direction with respect to the rotation axis in the extension part to limit movement in the axial direction.
The method according to claim 1,

The movement limiter

And a portion of the extension is machined by punching and provided at intervals that are radially symmetrical about the axis of rotation.
The method according to claim 1,

The movement limiter

A torque converter for a vehicle disposed on one side of the reactor and the inner race.
The method according to claim 1,

A vehicle torque converter having a bush disposed between the movement limiting portion and the inner race.
The method according to claim 1,

The outer race

Automotive torque converter processed by press processing and high frequency heat treatment method.