KR20110112423A - Stator and torque converter - Google Patents

Abstract

The present invention suppresses the occurrence of vortices in the part where the hydraulic oil is separated from the stator, thereby allowing the hydraulic oil to efficiently flow from the turbine to the impeller, thereby increasing the capacity factor. The stator of the torque converter rectifies the flow of the hydraulic oil returned from the turbine of the torque converter to the impeller, and includes an annular stator shell 25 and an annular stator. A plurality of stator blades 26 arranged so as to extend radially from the shell 26, the ends of the hydraulic oil outlet side being corrugated, and an annular shape disposed on the outer circumferential side of the stator blade 26. The stator core 27 is included.

Description

Stator and Torque Converters {STATOR AND TORQUE CONVERTER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator, in particular, a stator for rectifying the flow of hydraulic oil returning from the turbine of a torque converter to an impeller. The invention also relates to a torque converter, in particular a torque converter for transmitting torque from the engine to the transmission side by means of a fluid.

The torque converter includes a front cover, an impeller, a turbine, and a stator. Torque from the engine is transmitted to the front cover, which is then transmitted to the impeller. When power is transmitted to the impeller, the impeller rotates, the hydraulic oil moves to the turbine side, and the turbine rotates by the hydraulic oil moved to the turbine side. At this time, torque is transmitted from the turbine to the shaft on the transmission side, and the shaft on the transmission side is rotated. The hydraulic oil on the turbine side is returned to the impeller side through the stator.

Here, the stator is a mechanism for rectifying the flow of the hydraulic oil returned from the turbine to the impeller, and is disposed between the inner circumferential portion of the impeller and the turbine inner circumferential portion. The stator mainly consists of an annular stator shell, a plurality of stator blades provided on an outer circumferential surface of the shell, and an annular stator core fixed to the ends of the plurality of stator blades. The stator shell is supported on the fixed shaft via a one way clutch (Patent Document 1).

Japanese Patent Application Laid-Open No. 2001-355701

When paying attention to the flow of the fluid in the vicinity of the stator in the conventional torque converter as shown in Patent Document 1, near the fluid outlet in the blade of the stator, the working oil is separated from the blade. At this time, vortex occurs in the downstream side (impeller side) of the blade. When the vortex is generated in this manner, the loss of torque transmission capacity due to the working oil is increased, so that the capacity factor of the torque converter is reduced, and the efficiency of torque transmission is deteriorated.

An object of the present invention is to suppress the generation of vortex in the part where the hydraulic oil is peeled off from the stator, so that the hydraulic oil can flow from the turbine to the impeller efficiently, so that the capacity factor can be increased.

The stator of the torque converter according to claim 1 rectifies the flow of hydraulic oil returning from the turbine of the torque converter to the impeller, and is arranged to extend radially from the annular shell and the hydraulic oil outlet side. The edge portion includes a plurality of blades formed in a wave shape, and an annular core disposed on the outer circumferential side of the blade.

Here, since the edge of the blade exit side is formed in a wave shape, the speed of the hydraulic oil on the blade exit side becomes nonuniform. Therefore, large vortices do not occur as in the prior art, a relatively small number of vortices are generated, and the plurality of vortices act to cancel each other. Therefore, the fall of efficiency by generation | occurrence | production of a vortex can be suppressed.

In the stator of the torque converter according to claim 2, in the stator of claim 1, each of the plurality of blades is a plurality of recesses in the blade width direction with respect to a straight line connecting the shell end and the core end at the end of the hydraulic oil outlet side. Recesses are formed. Also in this case, the same effect as that of Claim 1 is acquired.

In the stator of the torque converter according to claim 3, in the stator of claim 1, each of the plurality of blades protrudes in the blade width direction with respect to a straight line connecting the shell end and the core end at the end of the hydraulic oil outlet side. A plurality of convex portions are formed. Also in this case, the same effect as that of Claim 1 is acquired.

The stator of the torque converter according to claim 4 is the stator according to any one of claims 1 to 3, wherein the wave shape of the plurality of blades has a ratio of the total height h of the unevenness to the total width H in the radial direction of 3%. 20% or less.

The torque converter according to claim 5 is a torque converter for transmitting torque from an engine to a transmission side by a fluid, comprising: an impeller to which torque from the engine is input; a turbine disposed opposite to the impeller and capable of outputting torque to the transmission; The stator as described in any one of Claims 1-4 arrange | positioned at the inner peripheral side between an impeller and a turbine is provided.

According to the present invention as described above, the occurrence of large vortex, particularly in the part where the hydraulic oil is peeled from the stator, is suppressed, and the capacity factor can be increased.

1 is a longitudinal cross-sectional schematic diagram of a torque converter as an embodiment of the present invention.
2 is a front partial view of the stator.
3 is an external perspective perspective view of the stator.
4 is a diagram showing a comparison of the characteristics of the torque converter using the stator blade of the present embodiment and the conventional torque converter.
5 is a view showing a stator blade according to another embodiment of the present invention.

[Basic Structure of Torque Converter]

1 is a longitudinal cross-sectional schematic diagram of a torque converter 1 employing one embodiment of the present invention. The torque converter 1 is a device for transmitting torque from a crankshaft (not shown) of the engine to an input shaft (not shown) of the transmission. An engine not shown is arranged on the left side of FIG. 1, and a transmission not shown on the right side of FIG. 1 is arranged. The O-O line shown in FIG. 1 is the rotation axis of the torque converter 1.

The torque converter 1 includes a torus 5 composed of three types of vanes (impeller 2, turbine 3, stator 4), and a lock up device. It consists of (6).

The front cover 10 is a disc-shaped member and is disposed close to the crankshaft tip of the engine. The center boss 11 is fixed to the inner circumferential portion of the front cover 10 by welding. On the outer circumferential side of the front cover 10 and on the engine side, a plurality of nuts 12 are fixed at equal intervals in the circumferential direction.

On the outer circumferential portion of the front cover 10, an outer circumferential cylindrical portion 13 extending to the axial transmission side is formed. The outer peripheral edge of the impeller shell 15 of the impeller 2 is fixed to the distal end of the outer cylindrical part 13 by welding. As a result, the front cover 10 and the impeller 2 form the fluid chamber in which hydraulic oil (fluid) was filled inside.

The impeller 2 mainly includes an impeller shell 15, a plurality of impeller blades 16 fixed inside the impeller shell 15, and an impeller hub 17 fixed to an inner circumference of the impeller shell 15. Consists of An annular impeller core 18 is fixed inside the plurality of impeller blades 16. The center part of the circle | round | yen of the impeller blade 16 becomes a half moon shape, and the impeller core 18 has the cross-sectional shape accordingly.

The turbine 3 is arrange | positioned facing the impeller 2 in the axial direction in the fluid chamber. The turbine 3 has a turbine shell 20, a turbine blade 21, a turbine core 22, and a turbine hub 23. The turbine shell 20 is an annular member whose inner circumferential side is fixed to the turbine hub 23 by welding. The turbine blades 21 are members fixed to the inside of the turbine shell 21, and are arranged in plural and arranged in the circumferential direction. The turbine core 22 is a portion provided at the tip of the turbine blade 21. The turbine hub 23 is a portion which is mounted to the shaft on the transmission side so as not to rotate relatively, and includes a cylindrical portion 23a and a disc-shaped flange 23b. The cylindrical part 23a is arrange | positioned at the outer peripheral side of the shaft on the transmission side, and the flange 23b protrudes toward the outer peripheral side from the substantially center of the axial direction of the cylindrical part 23a.

The stator 4 is a mechanism for rectifying the flow of hydraulic oil returned from the turbine 3 to the impeller 2. The stator 4 is an integral member formed by casting with resin, aluminum alloy, or the like. The stator 4 is disposed between the inner circumferential portion of the impeller 2 and the inner circumferential portion of the turbine 3. The stator 4 mainly includes an annular stator shell 25, a plurality of stator blades 26 provided on an outer circumferential surface of the stator shell 25, and an annular stator fixed to the ends of the plurality of stator blades 26. It consists of the core 27. The stator shell 25 is supported by a fixed shaft not shown through the one-way clutch 30. Furthermore, a retainer 31 is disposed on the axial engine side of the one-way clutch 30. The retainer 31 is disposed between the one-way clutch 30 and the flange 23b of the turbine hub 23, and holds the one-way clutch 30. Further, a plurality of grooves extending in the radial direction are formed in the contact surface with the flange 23b of the retainer 31, and the working oil can flow from the inner circumferential side to the outer circumferential side.

The thrust bearing 32 is arrange | positioned between the impeller hub 17 and the stator shell 25. As shown in FIG. Moreover, the sealing member 33 is arrange | positioned between the inner ring of the one-way clutch 30, and the outer peripheral part of the cylindrical part 23a of the turbine hub 23. As shown in FIG.

[Stator Blade]

Next, the stator blade 26 is demonstrated in detail with reference to FIGS. The stator blade 26 is a plate-shaped part having a predetermined width connecting the stator shell 25 and the stator core 27, as part of the stator blade 26 is enlarged. The stator blade 26 has an edge at the inlet side and an edge at the outlet side, and is formed to connect the shell side end S1 and the core side end C1 in a straight line at the end of the inlet side. On the other hand, the three recessed parts 26a which the shell side edge part S2 and the core side edge part C2 which are attached to the edge part of the exit side are not connected by the straight line M, but are concave inward (inlet side) with respect to the straight line M in the width direction. ) Is formed. This recessed part 26a is formed in an arc shape. In other words, at the end of the exit side of the stator blade 26, two convex portions 26b are formed which are tapered in the direction in which the hydraulic oil flows. Thus, it is formed in the waveform shape which has unevenness | corrugation in the blade width direction extended to the edge part of an exit side.

Here, these uneven parts 26a and 26b are not of the grade formed by a manufacturing error, but actively form uneven | corrugated. Here, with respect to the length (full width H in the radial direction) of the straight line connecting C2 to S2 in FIG. 2, the length (height h of the convex portion 26b) of the concave portion 26a is 3% or more and 20%. The following is preferable.

[Lockup device]

Next, the lockup device 6 will be described. The lockup device 6 mainly consists of the piston 40 and the damper mechanism 41.

The piston 40 is a disc-shaped member disposed between the front cover 10 and the turbine 3. An inner circumferential cylindrical portion 42 extending to the axial transmission side is formed in the inner circumferential portion of the piston 40. The inner circumferential cylindrical portion 42 is supported by the outer circumferential surface of the turbine hub 23 so as to be movable in a relative rotation and axial direction. And the axial transmission side edge part of the inner cylindrical part 42 abuts on the flange 23b of the turbine hub 23, and the movement to an axial transmission side is limited to a predetermined position. The sealing ring 43 is arrange | positioned at the outer peripheral surface of the turbine hub 23, and the sealing ring 43 seals the space of the axial direction in the inner peripheral part of the piston 40 mutually.

The outer peripheral part of the piston 40 functions as a clutch connection part. That is, the annular friction facing 45 is fixed to the engine side of the outer peripheral part of the piston 40. The friction facing 45 opposes the annular and flat friction surface formed on the inner circumferential inner surface of the front cover 10.

The damper mechanism 41 is composed of a retaining plate 46, a driven plate 47, and a plurality of torsion springs 48. The retaining plate 46 is fixed to the turbine 3 side of the outer circumferential portion of the piston 40 by a plurality of rivets 49. The retaining plate 46 has a cutting stand portion for storing and supporting the torsion spring 48. The plurality of torsion springs 48 are coil springs extending in the circumferential direction, and are accommodated in the retaining plate 46 to support both ends in the circumferential direction. The driven plate 47 is an annular plate fixed to the outer circumferential side of the turbine shell 20 of the turbine 3. The driven plate 47 has a projection click 47a that extends toward the front cover 10 and engages at both ends in the circumferential direction of the torsion spring 48.

[action]

Torque is transmitted from the crankshaft of the engine (not shown) to the front cover 10 and the impeller 2. The hydraulic oil driven by the impeller blades 16 of the impeller 2 rotates the turbine 3. The rotation of this turbine 3 is output via the turbine hub 23 to the input shaft of the transmission side which is not shown in figure. The hydraulic oil flowing from the turbine 3 to the impeller 2 flows to the impeller 2 side through a passage determined by the stator shell 25 and the stator core 27 of the stator 4.

Here, the flow of the hydraulic oil passing through the stator 4 is regulated by the stator blade 26, and is separated from the stator blade 26 at the end of the outlet side of the stator blade 26. At this time, since a plurality of unevenness is formed at the end of the exit side of the stator blade 26 and is corrugated, the flow velocity of the hydraulic oil flowing from the end of the exit side to the impeller 2 side is not uniform. Is changing accordingly. Therefore, large vortices which have occurred in the conventional stator blades do not easily occur, and relatively small vortices are irregularly generated, and as a result, these vortices cancel each other out.

이며, 종래의 용량 계수는 특성 Cc2, 토크비는 특성 T2, 토크 전달 효율은 특성

이다.Thus, since the generation | occurrence | production of a vortex is suppressed by the corrugated formation of the exit edge of the stator blade 26, stagnation of a capacitance coefficient can be suppressed. 4, the comparison of the characteristics of the torque converter using the conventional stator blade and the torque converter using the stator blade 26 of this embodiment is shown. 4, the characteristic shown by the solid line is a characteristic of this embodiment, and the characteristic shown by a broken line is the characteristic of the conventional torque converter. More specifically, the capacity coefficient of this embodiment is characteristic Cc1, torque ratio is characteristic T1, torque transmission efficiency is characteristic

Conventional capacity factor is characteristic Cc2, torque ratio is characteristic T2, torque transmission efficiency is characteristic

to be.

As is apparent from FIG. 4, it can be seen that in the torque converter using the stator blade 26 of the present embodiment, the capacity factor can be increased while maintaining the efficiency almost as in the prior art.

Then, when the hydraulic oil in the space between the front cover 10 and the piston 40 is drained from the inner circumferential side, the piston 40 moves to the front cover 10 side by the hydraulic pressure, so that the friction facing 45 It is pressed against the friction surface of the front cover 10. As a result, torque is transmitted directly from the front cover 10 to the turbine hub 23 via the lockup device 6.

[Other Embodiments]

The present invention is not limited to the above embodiments, and various variations or modifications can be made without departing from the scope of the present invention.

5 shows another embodiment of the stator blade. Here, the stator blade 26 'has the several convex part which protrudes outward in the width direction with respect to the straight line M which connects shell side edge part S2 and core side edge part C2 at the edge of an exit side. 26b '). The convex part 26b 'is formed to taper toward the direction in which hydraulic fluid flows, and the recessed part 26a' is formed between these, and it becomes a wave as a whole.

[Industry availability]

According to the present invention as described above, the generation of large vortex, particularly in the part where the hydraulic oil is peeled from the stator, is suppressed, so that the capacity factor can be increased.

1: torque converter
2: impeller
3: turbine
4: stator
25: Stator Shell
26: Stator Blade
26a: concave
26b: convex
27: starter core

Claims (8)

As a stator for rectifying the flow of the hydraulic oil returned from the turbine of the torque converter to the impeller,
Annular shells;
Arranged so as to extend radially from the annular shell, and at the end of the hydraulic oil outlet side, a plurality of concave or protruded in the blade width direction parallel to the straight line connecting the hydraulic oil inlet side and the outlet side A plurality of blades in which irregularities are formed in a wave shape at the end of the hydraulic oil outlet side;
An annular core disposed on an outer circumferential side of the blade
To include, the stator of the torque converter. The method of claim 1,
Each of the plurality of blades, at the end of the hydraulic oil outlet side, a plurality of concave portions concave in the blade width direction with respect to a straight line connecting the shell end and the core end, the stator of the torque converter. The method of claim 1,
Each of the plurality of blades, at the end of the hydraulic oil outlet side, a plurality of convex portions protruding in the blade width direction with respect to a straight line connecting the shell end and the core end, the stator of the torque converter. The method of claim 1,
The wave shape of the plurality of blades is a stator of the torque converter, wherein the ratio of the total height h of the unevenness to the total width H in the radial direction is 3% or more and 20% or less. A torque converter for transmitting torque from an engine to a transmission side by a fluid,
An impeller to which torque from the engine is input;
A turbine disposed opposite the impeller and capable of outputting torque to the transmission;
Stator disposed on the inner circumferential side between the impeller and the turbine
Including,
The stator is,
Annular shells;
Arranged so as to extend radially from the annular shell, at the end of the hydraulic oil outlet side, a plurality of irregularities concave or protruding in the blade width direction parallel to the straight line connecting the hydraulic oil inlet side and the outlet side is the hydraulic oil outlet A plurality of blades formed at the edges of the sides in a wave shape;
An annular core disposed on an outer circumferential side of the blade
And a torque converter. The method of claim 5,
Each of the plurality of blades has a plurality of recesses formed in the blade width direction with respect to a straight line connecting the shell end and the core end at the end of the hydraulic oil outlet side. The method of claim 5,
Each of the plurality of blades, at the end of the hydraulic oil outlet side, a plurality of convex portions protruding in the blade width direction with respect to a straight line connecting the shell end and the core end is formed. The method of claim 5,
The wave shape of the said some blade is a torque converter whose ratio of the total height h of the unevenness | corrugation with respect to the full width H of radial direction is 3% or more and 20% or less.

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