JPH05263894A - Torque converter - Google Patents

Abstract

PURPOSE:To raise the capacity and the overall efficiency of a torque converter comprising a pump impeller, a turbine runner and a stator. CONSTITUTION:Cores 22, 23 arranged in a dual structure are formed in a pump impeller 2, and slits 24 are made in a part of the outside first core 22 along the suction surfaces of impeller blades 21. The cores 22, 23 arranged in a dual structure have a suction opening 25 near the fluid outlet of the pump impeller 2 or near the fluid inlet of a turbine runner 4, and passages 26 connecting the vicinity of the fluid outlet of the pump impeller 2 or the vicinity of the fluid inlet of the turbine runner 4, to the slits 24, are formed by the cores 22, 23 arranged in a dual structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque converter applied to an automatic transmission of an automobile.

[0002]

2. Description of the Related Art Heretofore, as a torque converter, for example, one disclosed in Japanese Utility Model Laid-Open No. 1-144558 has been known.

The torque converter described in the above publication is usually called a three-element two-phase type and has a pump impeller, a turbine runner and a stator as fluid elements,
A one-way clutch that supports the stator on a fixed shaft is provided.

When the pump impeller is driven by the engine, the fluid inside is pushed outward along the pump impeller by the rotation of the pump, flows into the turbine runner, and imparts torque to the turbine runner to rotate it. A main circulation flow is formed, which passes through the stator and flows into the pump impeller again.

[0005]

However, since the radial flow type fluid elements such as the pump impeller and the turbine runner of the above-mentioned conventional torque converter have a complicated shape having a three-dimensional curvature, their blade surfaces and shells are complicated. A boundary layer (where a frictional loss occurs with a rapidly changing velocity distribution near the solid wall) is likely to occur on the core and core surfaces. In particular, the wing surface,
Of the shell surface and the core surface, the boundary layer generated on the core surface where the negative pressure portion is likely to occur, then the low energy fluid accumulates in the boundary layer portion to develop the boundary layer (FIG. 14).

[0006] For example, in the case of a pump impeller, when a boundary layer is formed on the core side in the flow path of the pump impeller, the boundary layer has a small flow velocity, so that it is perpendicular to the main circulation flow according to the pressure gradient of the main circulation flow. A secondary flow with a directional component is generated.

As shown in FIG. 15, this secondary flow flows from the pressure surface of the impeller blade to the core surface, and from the shell surface to the suction surface, so that on the core side of the suction surface of the impeller blade,
The low-energy fluid with large loss collects, and as shown in FIG. 14, a boundary layer develops.

As described above, when the boundary layer develops, the flow passage cross-sectional area of the circulating main flow is blocked by the boundary layer and becomes narrow, which limits the improvement of the torque converter capacity, and also the development of the boundary layer. As a result, the boundary layer joins with the main circulation flow in the flow path to increase the mixing loss, which also limits the improvement in the overall efficiency of the torque converter.

The present invention has been made in view of the above problems, and in a torque converter having a pump impeller, a turbine runner, and a stator, the capacity of the torque converter is improved and the overall efficiency of the torque converter is improved. It is a common task to achieve.

[0010]

In order to solve the above common problems, in the torque converter according to the first aspect of the invention, the high energy fluid is guided to the core surface through the flow path communicating from the high pressure portion, and is accumulated on the core side. And a means for blowing off the low energy fluid.

That is, a core having a double structure is formed on at least one of the pump impeller and the turbine runner,
A slit is formed along the suction surface of the blade in a part of the outer core, and the core of the double structure has an opening near the fluid outlet of the pump impeller or near the fluid inlet of the turbine runner. It is characterized in that the core of the structure forms a flow path that connects between the vicinity of the fluid outlet of the pump impeller or the vicinity of the fluid inlet of the turbine runner and the slit.

In order to solve the above-mentioned common problems, in the torque converter according to the second aspect, the means for suppressing the secondary flow flowing into the core surface from the pressure surface of the blade by means of the fence on the core surface.

That is, a fence having a blade height lower than that of the impeller blade or the turbine blade is provided in parallel with the impeller blade or the turbine blade on the core of at least one of the pump impeller and the turbine runner.

In order to solve the above-mentioned common problems, in the torque converter according to the third aspect, the fence on the shell surface suppresses the secondary flow flowing from the shell surface to the suction surface of the blade.

That is, a fence having a lower blade height than the impeller blade or the turbine blade is provided in parallel with the impeller blade or the turbine blade on at least one shell of the pump impeller and the turbine runner.

[0016]

According to the first aspect of the invention, the high energy fluid is generated by the pressure difference between the high pressure pump impeller near the fluid outlet or the turbine runner near the fluid inlet and the low pressure at the slit portion along the suction surface of the blade. Sucked into the opening,
It is discharged to the negative pressure surface of the blade via the flow path of the double-structured core. Therefore, the low energy fluid trying to accumulate in the boundary layer on the core side is blown away by the high energy fluid,
It is mixed with the circulating main flow and prevents the development of the boundary layer due to the accumulation of low energy fluid.

According to the second aspect of the invention, a fence having a lower blade height than the impeller blades or the turbine blades is provided on at least one core of the pump impeller or the turbine runner in parallel with the impeller blades or the turbine blades. Therefore, the secondary flow that tries to flow from the pressure surface of the blade to the core surface is blocked by the fence on the core surface, and a part of the low energy fluid that tends to collect on the core side due to the secondary flow circulates. The boundary layer is prevented from developing due to the accumulation of low-energy fluid by mixing with the main flow.

According to the third aspect of the present invention, a fence having a lower blade height than the impeller blades and the turbine blades is provided on at least one shell of the pump impeller and the turbine runner in parallel with the impeller blades and the turbine blades. Therefore, the secondary flow that tries to flow from the shell surface to the suction surface of the blade is blocked by the fence on the shell surface, and a part of the low energy fluid that tends to collect on the core side due to the secondary flow circulates. The boundary layer is prevented from developing due to the accumulation of low-energy fluid by mixing with the main flow.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, the structure will be described.

FIG. 1 is an upper half sectional view showing a torque converter of a first embodiment corresponding to the present invention described in claim 1 applied to an automatic transmission for an automobile, and FIG. 2 is a pump impeller with a second core removed. 1 is a view from the direction A in FIG. 1, and FIG. 3 is a view from the direction A in FIG. 1 showing the core portion of the pump impeller.

The torque converter of the first embodiment is arranged at a position opposite to the pump impeller 2 to which the engine driving force is input via the converter cover 1, and at a position opposite to the pump impeller 2, and a turbine hub 3 (not shown). A turbine runner 4 connected to the transmission input shaft, and a stator 6 arranged at an inner diameter position between the turbine runner 4 and the pump impeller 2 and provided via a one-way clutch 5 to a pump case (not shown). I have it.

The pump impeller 2 has an impeller shell 20, an impeller blade 21, and a first core 22 and a second core 23 having a double structure.

Of the two cores 22 and 23, the first core 22 (corresponding to a conventional impeller core) arranged outside is
As shown in FIG. 2, an oval or rectangular slit 24 is bored along the negative pressure surface 21a (in this case, a convex surface) of the impeller blade 21. In addition, 21b is the impeller blade 21.
Pressure surface (concave surface in this case).

As shown in FIG. 1, the inner diameter of the second core 23, which is disposed on the inner side of the two cores 22 and 23, is brought into close contact with the first core 22, and as shown in FIG. The diameter portion is partially brought into contact with the first core 22, and the intermediate portion other than the contact portion is arranged at substantially equal intervals with respect to the first core 22.

Between the first core 22 and the second core 23, one end communicates with a suction port 25 (corresponding to an opening) opened near the fluid outlet of the pump impeller 2 and the fluid inlet of the turbine runner 4. The flow path 26, the other end of which communicates with the slit 24, is formed. In the second core 23,
As shown in FIG. 3, radial ribs 23 a are provided at positions not interfering with the slits 24, except for the outer diameter portion which is in close contact with the first core 22, and the first core 22 is provided.
The outer diameter portion of the second core 23 and the partial contact portion formed by the rib 23a are bonded by brazing or spot welding.

The turbine runner 4 has a turbine shell 40, turbine blades 41, and a turbine core 42.

In FIG. 1, 7 is a lock-up clutch and 8 is a core chamber.

Next, the operation will be described.

When the pump impeller 2 is rotated by driving the engine, a circulating main flow passing through the pump impeller 2 → turbine runner 4 → stator 6 is formed, as shown in FIG. In the coupling region, torque is transmitted from the pump impeller 2 to the turbine runner 4 with the torque increasing action by stopping the stator 6, and in the coupling region, the torque is transmitted from the pump impeller 2 to the turbine runner 4 with rotation of the stator 6. Is transmitted.

During operation of the torque converter as described above, the pump impeller 2 and the turbine runner 4 have a three-dimensional curvature, and the circulating fluid is distributed on the blade surface, shell surface, and core surface of the flow path. Upon collision, a boundary layer is formed on these wing surface, shell surface, and core surface. Of these, comparing the pump impeller 2 and the turbine runner 4, the fluid flows from the higher pressure side to the lower pressure side in the turbine runner 4, whereas the pump impeller 2 is higher from the lower pressure side against the pressure increase. A boundary layer is likely to be generated due to the fluid flowing toward one side. Moreover, the core surface of the pump impeller 2 is likely to have a negative pressure portion, so that the boundary layer is significantly developed.

That is, since the flow velocity is small in the boundary layer on the core side, a secondary flow having a vertical component is generated in the main circulation flow according to the pressure gradient of the main circulation flow. This secondary flow is
As shown in FIG. 5, the impeller blade 21 flows from the pressure surface 21b to the core surface, and from the shell surface to the suction surface 21a, whereby the low-energy fluid with large loss is generated on the core side of the suction surface 21a of the impeller blade 21. Will come together. The first embodiment eliminates this low energy fluid.

Specifically, as shown in FIG. 4, near the fluid outlet of the high-pressure pump impeller 2 or near the fluid inlet of the turbine runner 4, and the slit 24 portion along the negative pressure surface of the low-impeller blade 21. The high energy fluid is sucked into the suction port 25 by the pressure difference of the above, and is discharged to the negative pressure surface of the impeller blade 21 through the slit 24 through the flow path 26 formed by the two cores 22 and 23 of the double structure. It

As a result, as shown in FIG. 5, the high energy fluid discharged from the slit 24 blows away the low energy fluid with large loss, which collects on the core side of the negative pressure surface 21a of the impeller blade 21, and circulates. The boundary layer is prevented from developing due to the accumulation of low-energy fluid.

Next, the effect will be described.

(1) In a torque converter including a pump impeller 2, a turbine runner 4, and a stator, one end of the impeller core portion is opened near the fluid outlet of the pump impeller 2 and the fluid inlet of the turbine runner 4.
Slit 2 which communicates with 5 and has the other end opened to the first core 22
4 is formed so that the low-energy fluid that is trying to accumulate on the core side is blown off by the high-energy fluid introduced from the suction port 25, so that the development of the boundary layer in the pump impeller 2 is prevented. By ensuring the main circulation flow with a wide flow passage cross-sectional area, the torque converter capacity can be improved, and the mixing loss due to the boundary layer joining with the main circulation flow in the flow passage can be kept low. Also, the efficiency of the pump impeller 2 and thus the overall efficiency of the torque converter can be improved.

(2) Among the torque converters, the boundary layer control structure for blowing the low energy fluid is provided only in the core portion of the pump impeller 2 in which the development of the boundary layer is most remarkable. Therefore, the structural change of the torque converter is minimized. It is possible to most effectively obtain the margin for improving the capacity of the torque converter and the margin for improving the overall efficiency of the torque converter.

(3) Since the rib 23a is provided on the inner second core 23 of the double-structured core and the inner and outer cores 22 and 23 are adhered to each other, the pump impeller 2 does not increase significantly.
The rigidity of can be improved.

(Second Embodiment) First, the structure will be described.

FIG. 6 is an upper half sectional view showing a torque converter of a second embodiment corresponding to the invention described in claim 1 applied to an automatic transmission for automobiles.

While the torque converter of the first embodiment applies the boundary layer control structure to the pump impeller 2, the torque converter of the second embodiment uses the same boundary layer control structure to the turbine runner 4. Is.

That is, the core of the turbine runner 4 has a double core structure composed of the first core 42 and the second core 43, and one end of the suction port 45 is opened near the fluid outlet of the pump impeller 2 and the fluid inlet of the turbine runner 4. Flow path 46 communicating with the slit 44 opened at the first core 42 at the other end.
Is formed, and the low-energy fluid that tends to accumulate on the core side of the turbine runner 4 is blown off by the high-energy fluid introduced from the suction port 45.

Since the other structures are similar to those of the first embodiment, the corresponding structures are designated by the same reference numerals and the description thereof will be omitted.

Regarding the operation, the low-energy fluid gathered on the core side of the pump impeller 2 is blown away by the high-energy fluid introduced from the suction port 25, or the low-energy fluid gathered on the core side of the turbine runner 4 is introduced from the suction port 45. The only difference is the high energy fluid that blows it away.

Next, the effect will be described.

(1) In a torque converter equipped with a pump impeller 2, a turbine runner 4, and a stator, one end of the turbine core is opened to the vicinity of the fluid outlet of the pump impeller 2 and the fluid inlet of the turbine runner 4
5 and the other end of the slit 4 is open to the first core 42.
4 is formed so that the low-energy fluid that tends to accumulate on the core side is blown away by the high-energy fluid introduced from the suction port 45, so that the development of the boundary layer in the turbine runner 4 is prevented. By ensuring the main circulation flow with a wide flow passage cross-sectional area, the torque converter capacity can be improved, and the mixing loss due to the boundary layer joining with the main circulation flow in the flow passage can be kept low. The efficiency of the turbine runner 4 and, consequently, the overall efficiency of the torque converter can be improved.

(2) A rib 43a (not shown) is provided on the inner second core 43 of the double-structured core so that both inner and outer cores 42,
Since 43 is bonded, the rigidity of the turbine runner 4 can be improved without a large increase in weight.

(Third Embodiment) First, the structure will be described.

FIG. 7 is an upper half sectional view showing a torque converter of a third embodiment corresponding to the present invention described in claim 1 applied to an automatic transmission for an automobile.

In contrast to the example in which the torque converter of the first embodiment applies the boundary layer control structure to the pump impeller 2, and the torque converter of the second embodiment applies the boundary layer control structure to the turbine runner 4. The torque converter of the third embodiment is an example in which the boundary layer control structure is applied to both the pump impeller 2 and the turbine runner 4 by combining both embodiments.

Since the respective constituent elements are the same as those in the first and second embodiments, the same reference numerals as those in FIGS. 4 and 6 are given to the respective constituent elements and the description thereof will be omitted.

Regarding the operation, the operation of the first embodiment and the second operation
The operation is combined with the operation of the embodiment, and the description is omitted.

Next, the effect will be described.

In the third embodiment, in addition to the effect of (1) below, the rigidity improving effect of the pump impeller 2 described in (3) of the first embodiment and (2) of the second embodiment are described. The rigidity of the turbine runner 4 can be improved.

(1) In a torque converter including a pump impeller 2, a turbine runner 4, and a stator, one end is opened near the fluid outlet of the pump impeller 2 and the fluid inlet of the turbine runner 4, at the impeller core portion and the turbine core portion. Form flow paths 26, 46 communicating with the suction ports 25, 45 and the other ends communicating with the slits 24, 44 opened in the first cores 22, 42, and accumulate on the core side of the pump impeller 2 and the turbine runner 4. Since the low energy fluid is blown away by the high energy fluid introduced from the suction ports 25 and 45, the development of the boundary layer in the pump impeller 2 and the turbine runner 4 is prevented, and the circulation main flow having a wide flow passage cross-sectional area This ensures a significant improvement in torque converter capacity, and the boundary layer merges with the main circulation in the flow path. Mixing loss due Rukoto also be kept low, significant improvement in overall efficiency of the torque converter due to the increased efficiency and efficiency of the turbine runner 4 of the pump impeller 2 is achieved.

(Fourth Embodiment) First, the structure will be described.

FIG. 8 is an upper half sectional view showing a torque converter of a fourth embodiment corresponding to the invention described in claim 2 applied to an automatic transmission for an automobile, and FIG. 9 is a pump impeller of FIG. FIG.

The first to third embodiments are examples in which the development of the boundary layer is suppressed by blowing off the low energy fluid by introducing the high energy fluid, while the fourth embodiment and the fifth embodiment described later are performed. The example is an example of suppressing the development of the boundary layer by suppressing the secondary flow.

That is, the boundary layer control structure of the fourth embodiment is
On the core 22 of the pump impeller 2, a fence 70 whose blade height is lower than that of the impeller blade 21 over the entire length from the inlet to the outlet of the core 22 is arranged along the impeller blade 21 at a substantially intermediate position between the adjacent impeller blades 21 and 21. It is configured by providing. Then, the fence 70 is fixed to the core 22 by the same method as that of the impeller blade 21, that is, the claw portion is thrust into the slit of the core and caulked and brazed.

Since the other structures are similar to those of the first embodiment, the corresponding structures are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation will be described.

FIG. 10 shows a flow pattern of the secondary flow in the fourth embodiment.

During operation of the torque converter, the fence 70 having a blade height lower than that of the impeller blade 21 is fixed to the pump impeller 2
Since it is provided in parallel with the impeller blades 21 on the core 22, the secondary flow that tries to flow from the pressure surface of the impeller blades 21 to the core surface is blocked by the fence 70 on the core surface and the secondary flow is generated. As a result, a part of the low energy fluid that tends to collect on the core side is mixed with the circulating main flow, and the development of the boundary layer due to the accumulation of the low energy fluid is prevented.

Next, the effect will be described.

(1) In the torque converter including the pump impeller 2, the turbine runner 4, and the stator, the fence 70 having a lower blade height than the impeller blade 21 is provided on the core 22 of the pump impeller 2 in parallel with the impeller blade 21. ,
Since the secondary flow that tries to flow into the core surface from the pressure surface of the impeller blades 21 is blocked by the fence 70 on the core surface, the development of the boundary layer in the pump impeller 2 is prevented, and the wide flow path is blocked. The torque converter capacity can be improved by ensuring a circulating mainstream having an area, and the mixing loss due to the boundary layer joining with the circulating mainstream in the flow path can be suppressed to a low level, so that the pump impeller 2 The efficiency, and hence the overall efficiency of the torque converter, can be improved.

(2) By disposing the fence 70 at a substantially intermediate position between the adjacent impeller blades 21 and 21, it is possible to achieve both blocking of the secondary flow and easiness of manufacturing.

That is, it is possible to expect "effective blocking of the secondary flow" by arranging the fence 70 on the suction surface side of the impeller blades 21, but if the fence 70 is too close to the suction surface side, processing and assembly will be performed. Becomes difficult. Further, when the fence 70 is arranged on the pressure surface side of the impeller blade 21, a secondary flow may be newly generated on the downstream side of the fence 70. As described above, the impeller blades 2 adjacent to the fence 70
It is preferable to arrange it at an approximately intermediate position between 1, 21.

(3) Since the fence 70 is installed on the core surface, the fence 70 itself can be small, and cost increase and weight increase can be suppressed.

(Fifth Embodiment) First, the structure will be described.

FIG. 11 is an upper half sectional view showing a torque converter of a fifth embodiment corresponding to the present invention described in claim 2 applied to an automatic transmission for automobiles. FIG. 12 is a pump impeller of FIG. FIG.

In the boundary layer control structure of the fifth embodiment, a fence 80 having a blade height lower than the impeller blade 21 over the entire length from the inlet to the outlet of the shell 20 is provided on the shell 20 of the pump impeller 2. , 21 in parallel with each other along the impeller blade 21. Then, this fence 80 is fixed to the shell 20 by the same method as that of the impeller blade 21, that is, the claw portion is thrust into the slit of the core and caulked and brazed.

Since the other structures are similar to those of the first embodiment, the corresponding structures are designated by the same reference numerals and the description thereof will be omitted.

Next, the operation will be described.

FIG. 12 shows a flow pattern of the secondary flow in the fourth embodiment.

During operation of the torque converter, the fence 80 having a blade height lower than that of the impeller blades 21 is operated by the pump impeller 2.
Since it is provided in parallel with the impeller blades 21 on the shell 20, the secondary flow that tries to flow from the shell surface to the suction surface of the impeller blades 21 is blocked by the fence 80 on the shell surface, and the secondary flow. Due to this, a part of the low energy fluid that tends to collect on the core side is mixed with the circulating main flow,
Boundary layer development due to the accumulation of low energy fluids is prevented.

Next, the effect will be described.

(1) In the torque converter including the pump impeller 2, the turbine runner 4, and the stator, a fence 80 having a lower blade height than the impeller blade 21 is provided on the shell 20 of the pump impeller 2 in parallel with the impeller blade 21. Since the secondary flow that tries to flow into the suction surface of the impeller blades 21 from the shell surface is blocked by the fence 80 on the shell surface, the development of the boundary layer in the pump impeller 2 is prevented, and the wide flow path is prevented. The torque converter capacity is improved by ensuring the circulation main flow having a cross-sectional area, and the mixing loss due to the boundary layer joining with the circulation main flow in the flow path is also suppressed to be low, so that the pump impeller 2 It is also possible to improve the efficiency of the torque converter and the overall efficiency of the torque converter.

(2) By arranging the fence 80 at a substantially intermediate position between the adjacent impeller blades 21 and 21, it is possible to achieve both blocking of the secondary flow and ease of manufacturing.

The reason is the same as in the fourth embodiment.

(3) Since the fence 80 is installed on the shell surface, the rigidity of the shell 20 against expansion is increased and the strength as a pressure vessel is improved.

Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. Be done.

For example, in the fourth and fifth embodiments,
Although the example in which the fence is provided on the pump impeller is shown, the fence may be provided on the core surface or the shell surface of the turbine runner, and further, the fence may be provided on both the pump impeller and the turbine runner.

The fences of the fourth and fifth embodiments are
Although it is provided over the entire length from the entrance of the core or shell to the exit, even if a fence is provided in the latter half of the exit of the core or shell, the blocking effect of the secondary flow is sufficiently exerted.

[0084]

According to the present invention as set forth in claim 1, in a torque converter including a pump impeller, a turbine runner, and a stator, a high-energy fluid is guided to a core surface through a passage communicating from a high-pressure portion, Since the low-energy fluid that is trying to accumulate on the core side is blown off, the development of the boundary layer is prevented by the action of joining the low-energy fluid with the main circulation flow, and the capacity of the torque converter can be improved and the torque converter can be improved. It is possible to obtain the effect that the overall efficiency of can be improved.

In the torque converter of the present invention as defined in claim 2, since the secondary flow flowing from the pressure surface of the blade to the core surface is suppressed by the fence on the core surface,
The effect of joining the low-energy fluid with the main circulation flow prevents the development of the boundary layer, thereby improving the capacity of the torque converter and improving the overall efficiency of the torque converter.

According to the third aspect of the torque converter of the present invention, the secondary flow flowing from the shell surface to the negative pressure surface of the blade is suppressed by the fence on the shell surface. The effect of merging with is that the development of the boundary layer is prevented, the capacity of the torque converter can be improved, and the overall efficiency of the torque converter can be improved.

[Brief description of drawings]

FIG. 1 is an upper half sectional view showing a torque converter according to a first embodiment of the present invention.

FIG. 2 is a view from the direction of arrow A in FIG. 1 showing the pump impeller from which the second core has been removed.

FIG. 3 is a view showing a core portion of the pump impeller as viewed in the direction of arrow A in FIG.

FIG. 4 is an explanatory view of the operation of the torque converter of the first embodiment.

FIG. 5 is a flow pattern showing a secondary flow state in the torque converter of the first embodiment.

FIG. 6 is an upper half sectional view showing a torque converter according to a second embodiment of the present invention.

FIG. 7 is an upper half sectional view showing a torque converter of a third embodiment of the present invention.

FIG. 8 is an upper half sectional view showing a torque converter according to a fourth embodiment of the present invention.

9 is a view from the direction of arrow A in FIG. 8 showing the core of the pump impeller.

FIG. 10 is a flow pattern showing a secondary flow state in the torque converter of the fourth embodiment.

FIG. 11 is an upper half sectional view showing a torque converter of a fifth embodiment of the present invention.

FIG. 12 is a view in the direction of arrow A in FIG. 11 showing the core portion of the pump impeller.

FIG. 13 is a flow pattern showing a secondary flow state in the torque converter of the fifth embodiment.

FIG. 14 is an operation explanatory view showing a flow state of the pump impeller in the conventional torque converter.

FIG. 15 is a flow pattern showing a secondary flow state in the conventional torque converter.

[Explanation of symbols]

 2 Pump Impeller 20 Impeller Shell 21 Impeller Blade 22 First Core 23 Second Core 24 Slit 25 Suction Port (Opening) 26 Flow Path 4 Turbine Runner 41 Turbine Blade 6 Stator

Claims (3)

[Claims] 1. A double-structured core is formed in at least one of a pump impeller and a turbine runner, and a slit along the suction surface of the blade is formed in a part of the outer core, and the double-structured core is formed. Has an opening in the vicinity of the fluid outlet of the pump impeller or in the vicinity of the fluid inlet of the turbine runner, and the core of the double structure communicates between the vicinity of the fluid outlet of the pump impeller or the vicinity of the fluid inlet of the turbine runner and the slit. A torque converter having a flow path formed therein. 2. A torque converter characterized in that a fence having a blade height lower than that of an impeller blade or a turbine blade is provided in parallel with the impeller blade or the turbine blade on the core of at least one of the pump impeller and the turbine runner. 3. A torque converter characterized in that a fence having a blade height lower than that of an impeller blade or a turbine blade is provided on at least one shell of a pump impeller or a turbine runner in parallel with the impeller blade or the turbine blade.