JPH08270749A - Stator blades - Google Patents

Abstract

PURPOSE: To reduce torque capacity coefficient in a stall time by arranging a regulating means, which regulates the stator diameter directional flow of working fluid flowing on the surface of a blade, on at least one side of both sides between which the stator diameter directional center in the blade constituting a stator is positioned. CONSTITUTION: A fin member 10, which regulates the stator 7 diameter directional flow of working fluid flowing on the surface of a blade 9, is arranged along the chord direction from the approximately center in the inflow direction of the working fluid from a turbine to the downstream side in the blade 9. Therefore, secondary flow of the working fluid flowing from the vicinity of the blade end of the blade 9 to the blade center along the back face side collides against the fin member 10 so as to be regulated. In this way, the flow of the working fluid flowing along the back face of the blade 9 is prevented from peeling off from the surface of the blade 9 when a speed ratio is low, so that a torque capacity coefficient in a stall time can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a torque converter, and more particularly to a structure of a blade of a stator of a torque converter installed in a driving force transmission system of an automobile.

[0002]

2. Description of the Related Art Generally, in an automatic transmission installed in a driving force transmission system of an automobile, a torque converter having a torque conversion function is used as a transmission device for transmitting an engine output to a transmission mechanism. For example, as shown in FIG. 9, the torque converter A includes a pump C fixed to one side of a case B that is rotationally driven by the engine.
A turbine E that is rotatably disposed on the other side of the case B facing the pump C and rotates integrally with the turbine shaft D; and a one-way clutch F that is interposed between the pump C and the turbine E. A stator G interlockingly coupled to a turbine shaft D via a lockup clutch H interposed between the turbine E and the case B is provided. The turbine shaft D is driven through the turbine E by the flow of the working fluid generated by the rotation of the pump C, and the stator G is provided with the flow of the working fluid that flows out from the turbine E and returns to the pump C side. A rotational force is applied to the plurality of blades I ... I thus generated, and the rotational force is transmitted to the turbine shaft D in the locked state of the one-way clutch F to increase the axial torque acting on the turbine shaft D. ing.

In this case, as a blade cross-sectional shape of the blades I ... I which constitute the stator G, a so-called tear in which the inflow portion of the working fluid from the turbine B is rounded as shown in FIG. It is customary to form in the form of drops. By thus forming the blade cross-sectional shape of the blades I ... I of the stator G into a teardrop shape, the working fluid flowing from the turbine E when the speed ratio is small, such as during stall, becomes
Part of it flows along the front surface of the blade as shown by arrows a to c, and part of it is also actively guided to the back side of blades I ... I as shown by arrows d to f. Becomes
Due to the negative pressure effect due to this back flow, a favorable torque increasing action or transmission efficiency can be obtained.

[0004]

In a vehicle equipped with this type of torque converter, if the torque capacity coefficient at the time of stall is unnecessarily large, for example, fuel consumption performance deteriorates or vehicle body vibration increases. There's a problem. Therefore, as a recent tendency, the torque capacity coefficient at the time of stall tends to be reduced.

However, if the curvature of the rear half of the blade of the stator is increased in order to reduce the torque capacity coefficient at the time of stall, the flow along the back surface of the blade tends to separate in the latter half of the blade, and the torque capacity coefficient is reduced. It had become a problem to be solved in order to reduce it.

The inventors of the present application have investigated the cause of back flow separation, and have come to the following tentative conclusion.

That is, as schematically shown in FIG.
The working fluid colliding with the front surface side of the blade I of the stator G produces a strong secondary flow on the inner peripheral side and the outer peripheral side of the stator G. Then, it is considered that this secondary flow circulates inside the back flow along the back surface of the blade I and separates the working fluid forming the back flow from the blade surface.

The present invention has been made based on such knowledge, and an object thereof is to further reduce the torque capacity coefficient of the torque converter at the time of stall.

[0009]

That is, the invention according to claim 1 of the present application (hereinafter referred to as the first invention) is a torque converter installed in a driving force transmission system of an automobile for transmitting engine output to driving wheels. In the stator, a regulating means for regulating a flow of a working fluid flowing on the surface of the blade in the radial direction of the stator is provided on at least one side of the blade constituting the stator with the center in the radial direction of the stator interposed therebetween. .

The invention according to claim 2 of the present application (hereinafter referred to as the second invention) is the main flow of the working fluid that flows into the stator from the turbine side and flows out to the pump side by the regulating means in the first invention. It is characterized in that it is constituted by a fin member provided on the blade along the flow direction.

The invention according to claim 3 of the present application (hereinafter,
A third invention) is characterized in that the restricting means in the first invention is constituted by a recess provided in the blade along the main flow direction of the working fluid flowing into the stator from the turbine side and flowing out to the pump side. And

The invention according to claim 4 of the present application (hereinafter,
According to a fourth aspect of the invention), the regulating means in the first aspect of the invention is constituted by a step portion provided on the blade along the main flow direction of the working fluid flowing into the stator from the turbine side and flowing out to the pump side. Characterize.

Further, the invention according to claim 5 of the present application (hereinafter referred to as the fifth invention) is that the restriction means of the first invention is a main flow of the working fluid flowing from the turbine side into the stator and out into the pump side. It is characterized in that it is provided on the downstream side in the flow direction.

[0014]

According to the above construction, the following operation can be obtained.

That is, according to the first aspect of the present invention, the regulating means for regulating the flow of the working fluid flowing on the surface of the blade in the radial direction of the stator on at least one side across the center of the blade of the stator in the radial direction of the stator. Since the flow of the working fluid flowing along the back surface of the blade is not separated from the surface of the blade, the torque capacity coefficient at the time of stall is reduced and the fuel efficiency is improved. become.

According to the second invention, the operation of the first invention is achieved by the fin member provided on the blade along the flow direction of the main flow of the working fluid flowing in from the turbine side and flowing out to the pump side. Will be done.

Further, according to the third aspect of the invention, the action of the first aspect of the invention is achieved by the recess formed in the blade along the main flow direction of the working fluid that similarly flows in from the turbine side and flows out to the pump side. Will be done.

According to the fourth aspect of the invention, the action of the first aspect of the invention is achieved by the stepped portion formed on the blade along the flow direction of the main flow of the working fluid flowing in from the turbine side and flowing out to the pump side. Will be done.

Further, according to the fifth aspect of the present invention, the restricting means for restricting the flow of the working fluid flowing on the blade surface in the radial direction of the stator flows in the main flow direction of the working fluid flowing in from the turbine side and flowing out to the pump side. Since it is provided on the downstream side, the torque capacity coefficient at the time of stall can be effectively suppressed without causing an unnecessary increase in weight.

[0020]

EXAMPLE As shown in FIG. 1, also in this example,
In the torque converter 1, as in the conventional case, a pump 3 fixedly mounted on one side of the case 2 that is rotationally driven by the engine, and rotatable to the other side of the case 2 facing the pump 3. A turbine 5 disposed integrally with the turbine shaft 4 and rotating integrally with the turbine shaft 4, a stator 7 interposed between the pump 3 and the turbine and interlockingly connected to the turbine shaft 4 via a one-way clutch 6, the turbine 5 and the case 2
A lock-up clutch 8 is provided between the lock-up clutch 8 and the lock-up clutch 8. Inner ring 7a and outer ring 7b that constitute the stator 7
9, a plurality of blades 9 ... 9 having a teardrop-shaped blade cross-section are arranged at appropriate intervals as shown in FIG.

In this embodiment, the fin member 10 for restricting the flow of the working fluid flowing on the surface of the blade in the radial direction of the stator is provided downstream from the substantially middle portion of the blade 9 in the inflow direction of the working fluid from the turbine 5. It is provided along the chord direction extending to the side. As shown in FIG. 3, the fin members 10 are provided near both blade tips of the blade 9 (center of the blade in the radial direction of the stator).

By providing the fin member 10 extending in the chord direction near the blade tip of the blade 9 in this way, as shown in FIG. 4, the fin member 10 extends from the vicinity of the blade tip toward the blade center along the rear surface side. The secondary flow of the working fluid collides with the fin member 10 and is regulated. This prevents the flow of the working fluid flowing along the back surface of the blade 9 when the speed ratio is small from being separated from the blade surface in the latter half of the blade of the blade 9.

FIG. 5 shows a performance curve of the torque converter 1 to which this embodiment is applied.

That is, the torque capacity in the vicinity of the speed ratio of zero is lower when the blade is provided with fins than when the fins are not provided. Note that there is almost no difference in the torque ratio and the torque transmission efficiency. This confirms that in order to reduce the torque capacity coefficient at the time of stall, it is effective to restrict the secondary flow from the vicinity of the blade tip to the blade center along the back side.

As shown in FIG. 6, a fin member 10 may be provided so as to surround the entire circumference of the blade 9.

Further, as shown in FIG. 7, a recess 11 may be provided near the blade tip of the blade 9, or as shown in FIG. 8, a step portion 12 may be provided at the blade tip of the blade 9.
In any case, the secondary flow of the working fluid from the vicinity of the blade tip of the blade 9 toward the blade center along the back side is restricted.

[0027]

As described above, according to the present invention, at least one side of the blades forming the stator of the torque converter with the center in the radial direction of the stator interposed therebetween, in the radial direction of the stator of the working fluid flowing on the blade surface. Since the regulation means for regulating the flow of the working fluid is provided, the flow of the working fluid flowing along the back surface of the blade does not separate from the surface of the blade, which reduces the torque capacity coefficient at the time of stall. Fuel efficiency will be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a torque converter according to an embodiment.

FIG. 2 is a schematic view showing a blade cross-sectional shape of a blade when a stator is developed and seen.

FIG. 3 is an enlarged sectional view of a main part of a stator.

FIG. 4 is a schematic view of a blade showing the operation of the embodiment.

FIG. 5 is a performance curve of a torque converter to which the embodiment is applied.

FIG. 6 is a schematic view showing a blade cross-sectional shape of a blade when a stator according to another embodiment of the present invention is developed and seen.

FIG. 7 is a schematic view of a blade showing another embodiment of the present invention.

FIG. 8 is a schematic view of a blade showing still another embodiment of the present invention.

FIG. 9 is a main-portion cross-sectional view showing a general structure of a torque converter.

FIG. 10 is a schematic view showing a blade cross-sectional shape of a blade when the stator is developed and seen.

FIG. 11 is a schematic view showing a state where the back flow of the blade is separated.

[Explanation of symbols]

 1 Torque Converter 7 Stator 9 Blade 10 Fin Member 11 Recess 12 Step

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanori Tanimoto 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Motor Corporation

Claims (5)

[Claims] 1. In a stator of a torque converter installed in a driving force transmission system of an automobile for transmitting engine output to driving wheels, at least one side of the blades forming the stator with a center in a radial direction of the stator interposed therebetween. A blade for a stator of a torque converter, characterized in that a regulating means for regulating a flow of a working fluid flowing on the surface of the blade in a radial direction of the stator is provided. 2. The restricting means is a fin member provided on the blade along the flow direction of the main flow of the working fluid flowing into the stator from the turbine side and flowing out to the pump side. Blade of stator of the described torque converter. 3. The restricting means is a recess provided in the blade along the flow direction of the main flow of the working fluid flowing into the stator from the turbine side and flowing out to the pump side. Torque converter stator blades. 4. The regulating means is a stepped portion provided on the blade along the flow direction of the main flow of the working fluid flowing into the stator from the turbine side and flowing out to the pump side. Blade of stator of the described torque converter. 5. The regulating means is provided on the downstream side in the flow direction of the main flow of the working fluid flowing into the stator from the turbine side and flowing out to the pump side.
The blade of the stator of the torque converter described in.