KR20050067962A - Torque converter for vehicle - Google Patents

Abstract

Disclosed is a torque converter capable of sufficiently securing the length of the reactor blade flow path by modifying the blade shape of the reactor. The torque converter includes an impeller, a turbine, and a reactor for changing a flow of oil flowing from the turbine to the impeller to increase a torque change rate, wherein the reactor includes a blade having multiple stages. And means for increasing the flow path of oil entering the impeller. Therefore, the present invention is provided with a plurality of blades of the reactor, the outer circumferential side of each blade shape is made in a round shape, and both sides of the blade are widened toward the portion facing the inner circumferential surface so that the direction of the fluid from the turbine to the impeller can be switched. When the fluid flows through the length is long enough to ensure a sufficient flow path, the occurrence of the vortex in the outer peripheral portion is remarkably reduced, there is an effect that can increase the torque performance.

Description

Torque converter for automatic transmission {Torque converter for vehicle}

The present invention relates to a torque converter for an automatic transmission, and more particularly, to a torque converter for an automatic transmission in which a shape of a reactor blade is deformed to sufficiently secure a length of a reactor blade passage and performance tuning according to a speed ratio is possible. will be.

In general, a technique relating to the stator shape of a torque converter is disclosed in US Patent No. 5,966,934. The publication is provided with a fan (steps formed by multiple blades) for limiting the movement of vortices generated in the reactor blade by configuring the reactor (stator) blade in multiple stages to realize thinning of the torque converter while maintaining the conventional torque performance. Techniques that can be disclosed are disclosed. However, in the technique described in the above publication, a vortex phenomenon (vortex) occurs on the blade tip side (outer circumferential side) of the reactor, and a part having a step serves to block the movement of the vortex to some extent to reduce the effect of the vortex. Although there is a number, there is still a problem that vortex may occur, which may adversely affect the performance of the torque converter.

Therefore, the present invention has been proposed to solve the above problems, and the object of the present invention is to secure an existing torque capacity and to be ultra-thin, and to further improve the performance by reducing the eddy phenomenon by sufficiently securing the flow path of the reactor blade. It is to provide a torque converter that can be.

In order to achieve the above object, the present invention, in the torque converter having an impeller, a turbine and a reactor for increasing the rate of change of torque by changing the flow of oil flowing from the turbine to the impeller side, the reactor is a multi-stage blade It is provided, and provides a torque converter for an automatic transmission comprising a means for increasing the flow path of oil flowing into the impeller from the turbine.

The present invention is made of a multi-stage blade of the reactor at the same time the outer peripheral portion is made in a round shape, both sides of the blade of the reactor toward the input shaft of the transmission is made of a fan-shaped form that is gradually opened to the fluid from the turbine to the impeller When is transmitted, the flow direction of the fluid is changed through the longer flow path to achieve a torque conversion. And the outer circumferential front end portion of the reactor has a round shape can be suppressed the vortex phenomenon (eddy phenomenon) of the fluid.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a half sectional view for explaining an embodiment according to the present invention, Figure 2 is a perspective view showing a reactor applied to Figure 1, showing a torque converter. The torque converter includes a front cover 3 having a front boss 1 connected to a crank shaft of an engine (not shown) and receiving a driving force, an impeller 5 coupled to the front cover 3 to rotate together; A turbine 7 disposed at a position opposite to the impeller 5 and rotated by a fluid in accordance with the rotation of the impeller 5, disposed between the impeller 5 and the turbine 7 and in the turbine 7 A reactor 9 (also referred to as a "stator") is arranged which reverses the direction of the fluid flow being transmitted to the impeller 5 to increase the rate of torque change.

The impeller (5) and the turbine (7) is disposed on the outer periphery of the input shaft (not shown) of the transmission, and rotates. An inner race 11 and a one-way clutch (between the input shaft and the reactor 9) are rotated. 13, and the outer race 15 is arranged. That is, the reactor 9 is coupled to the outer circumferential surface of the outer race 15.

The reactor 9 has a support 17 coupled to the outer race 15, a plurality of first blades 19 coupled to an outer circumference of the support 17, and an outer circumferential direction of the first blade 19. A plurality of second blades 21 are coupled to each other, and a connecting portion 23 connecting the tip of the second blade 21.

The support 17 is coupled to the outer race 15, the portion facing the outer peripheral surface is made of a round shape. In addition, the first blade 19 coupled to the rounded outer circumferential surface of the support part 17 has a tip portion toward the outer circumferential surface in a round shape, and the width becomes wider toward the axis center (input shaft) direction (in FIG. 2). a). In addition, the second blade 21 is coupled to the rounded outer circumferential side of the first blade 19, and its front end (end portion directed toward the outer circumferential side) also has a round shape. The second blade 21 has a form (indicated by b in FIG. 2) that becomes wider in the direction toward the axis center (input shaft). The distal end of the second blade 21 is provided with a connecting portion 23 connecting the round distal end of each second blade 21. The connecting portion 23 also has a rounded shape (shown in FIG. 2) in the circumferential side direction.

In the present invention thus achieved, the torque is increased as the fluid moving from the turbine 7 to the impeller 5 is changed by the first and second blades 19 and 21 of the reactor. In other words, the fluid in the torque converter is redirected from the impeller 5 to the turbine 7 and from the turbine 7 by the reactor 9 to flow back to the impeller 5.

At this time, the fluid is the support portion 17 to which the first and second blades 19 and 21 are coupled and the first and second blades 19 and 21 and the connection portion 23 coupled to the outer circumferential surface of the second blade 21. It is guided and moved along a portion formed in a round shape (indicated by an arrow in FIG. 3). Therefore, it is possible to significantly reduce the generation of vortex of the fluid flowing into the impeller. In addition, the first and second blades 19 and 21 may have a fan shape having a and b, respectively, so that the flow path of the fluid may be sufficiently long in a limited space, thereby increasing torque performance.

In addition, when manufacturing the torque converter by changing the design of the angle of the first blade 19 may have the effect of local performance tuning according to the speed ratio.

As described above, the present invention is provided so that the outer circumferential side of each blade shape has a round shape as well as the blade of the reactor is made in multiple stages, and both sides of the blade become wider toward the portion facing the inner circumferential surface so that the direction of the fluid from the turbine to the impeller is switched. In this case, the flow path through which the fluid passes is long enough to secure a sufficient flow path, and the occurrence of vortices in the outer peripheral part is significantly reduced, thereby increasing the torque performance.

In addition, the present invention has the effect of local performance tuning according to the speed ratio when manufacturing by changing the angle of the reactor blade of the portion coupled to the outer race side of the one-way clutch.

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

2 is a perspective view showing the shape of a reactor according to the present invention.

3 is a view showing a part of a torque converter for explaining the operation according to the present invention.

Claims (3)

In a torque converter having an impeller, a turbine, and a reactor for increasing the rate of change of torque by changing the flow of oil flowing from the turbine to the impeller, The reactor is a multi-stage blade, torque converter for an automatic transmission comprising a means for increasing the flow path of oil flowing from the turbine to the impeller. The method of claim 1, wherein the means for increasing the flow path of the oil is A support part which is supported by the outer race of the one-way clutch and has a surface facing the outer circumferential side in a round shape; A plurality of first blade parts disposed on the rounded part of the support part and having a surface facing the outer circumferential side in a round shape; A plurality of second blade parts disposed on a round part of the first blade part and having a round shape in a part facing the outer circumferential side; A connecting portion connecting the rounded outer circumferential portion of the second blade portion; Torque converter for automatic transmission comprising a. 3. The torque converter according to claim 2, wherein the first and second blade portions have a shape in which both side surfaces thereof are widened in a direction toward the inner circumferential surface side.