JP4071478B2 - Impeller for fluid transmission device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an impeller for a hydraulic power transmission device including a torque converter and a fluid coupling used in vehicles and industrial machines, and more particularly to an annular shell and a plurality of sheets arranged at fixed positions on the inner surface of the shell. A retainer plate that is brazed to the inner peripheral surface of the shell while holding the radially inner ends of the blades against the shell, and a hub that is welded to the inner peripheral edge of the shell and the retainer plate. It is related with the improvement of a bag.
[0002]
[Prior art]
Such a hydraulic power transmission for the impeller, for example, Japanese as disclosed in Japanese Sho 58-97448, is already known.
[0003]
[Problems to be solved by the invention]
In conventional impellers for fluid transmission devices, when welding between the shell and the hub, one side of the shell is abutted against one side of the positioning flange formed on the outer periphery of the hub, and fillet welding is performed between the positioning flange and the shell. Has been given.
[0004]
In such conventional devices, the retainer plate is connected to the shell only by brazing, and the strength of the bond is required to be strengthened.
[0005]
The present invention has been made in view of such circumstances, and the fluid transmission device described above is capable of effectively strengthening the coupling force of the retainer plate to the shell using the coupling portion between the shell and the hub. An object is to provide an impeller.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a saddle-like and annular shell, a plurality of blades coupled to a fixed position on the inner surface of the shell, and brazed to the inner surface of the shell. an annular retainer plate for pressing a radially inner end, and a hub which is fitted into the center hole of the shell and the retainer plate, the impeller fluid transmission device, the center hole of the shell and the retainer plate and substantially the same diameter with the shell is TIG welded from the outer surface to the outer periphery of the hub at the inner peripheral edge of the central hole, arranged to the retainer plate is held between the outer periphery formed locating flange and shell of the hub The brazing material prevents the molten brazing material from flowing out to the TIG weld between the shell and the hub during the brazing between the mating surfaces of the shell and the retainer plate. That blocking means are provided to the first feature.
[0007]
According to the first feature, the retainer plate is firmly held between the positioning flange of the hub and the shell welded to the hub, and the coupling force between the retainer plate and the shell is effectively reduced. Can be reinforced. Also, when brazing between the shell and the retainer plate, the molten brazing material can be prevented from flowing out to the TIG welded portion outside the inner peripheral edge of the shell by the brazing material blocking means, and therefore TIG welding between the shell and the hub is prevented. , It can be carried out reliably without being obstructed by the brazing material.
[0008]
The present invention, in addition to the first feature, the abutment surface of the positioning flange of the retainer plate is machined, the shell and the retainer plate is fitted, the axial length of the outer peripheral surface of the hub The second feature is that it is set to be approximately equal to the total thickness of the shell and the retainer plate.
[0009]
According to the second feature, the positioning flange of the hub that is not directly involved in the welding between the shell and the hub can be thinned, and the outer surface of the shell and the hub can be made substantially flush. Therefore, the axial dimension of the hub can be shortened, which can contribute to the compactness of the impeller for the fluid transmission device .
[0010]
In addition to the first feature of the present invention, the contact surface of the retainer plate with the positioning flange is cut, and the brazing material blocking means is formed on one of the mating surfaces of the shell and the retainer plate. that it is configured by the bringing into close contact with the other of the mating surfaces over an annular projection on the entire periphery to the third feature.
[0011]
According to the third feature, during brazing between the shell and retainer plate, that the molten brazing material flows out to the TIG welds of the inner peripheral edge portion outside the side of the shell can be prevented by the annular protrusion.
[0012]
Furthermore, in the present invention, in addition to the first feature, the brazing material blocking means is formed by welding an annular protrusion formed on one of the mating surfaces of the shell and the retainer plate over the entire circumference to the other mating surface. It is the fourth feature that it is configured.
[0013]
According to the fourth feature, when brazing between the shell and retainer plate, that the molten brazing material flows out to the inner peripheral edge portion outside the side of the shell can be prevented by the annular protrusion. Moreover, a semi-finished product of an impeller comprising a shell, a blade and a retainer plate can be easily obtained by welding the annular protrusion to the mating member.
[0014]
The present invention, in addition to the first feature, the brazing material blocking means, at least one of the mating surfaces of the shell and retainer plate to form a seal film consisting of oil paint in close contact with the other of the mating surfaces, it is a fifth aspect of being configured by that spot welding at several points between the shell and retainer plate (51).
[0015]
According to the fifth feature, it is possible to prevent during brazing between the shell and retainer plate, that the molten brazing material flows out to the inner peripheral edge portion outside the side of the shell by the seal film.
[0016]
Incidentally, the fluid power transmission device and the impeller corresponds to the torque converter T and the turbine impeller 3 in the embodiment of the present invention to be described later.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.
[0018]
1 is a longitudinal side view of a torque converter according to a first embodiment of the present invention, FIG. 2 is a partial plan view of a turbine impeller of the torque converter, and FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 4 is an explanatory diagram of the manufacturing process of the torque converter, FIG. 5 shows a second embodiment of the present invention, a correspondence diagram with FIG. 3, and FIG. 6 shows a third embodiment of the present invention, a correspondence diagram with FIG. It is.
[0019]
First, the description starts with the description of the first embodiment of the present invention shown in FIGS. In FIG. 1, a torque converter T as a fluid transmission device includes a pump impeller 2, a turbine impeller 3 opposed to the pump impeller 2, and a stator impeller 4 disposed between the inner peripheral portions thereof. Between the impellers 2, 3 and 4, a circulation circuit 6 for power transmission by the working oil is defined.
[0020]
A side cover 5 that covers the outer surface of the turbine impeller 3 is integrally connected to the outer periphery of the shell 2s of the pump impeller 2 by welding. A ring body having a plurality of connection bosses 7 arranged in the circumferential direction or a plurality of separate connection bosses 7 are welded to the outer peripheral surface of the side cover 5. A drive plate 8 coupled to 1 is fixed with bolts 9. A thrust needle bearing 36 is interposed between the hub 3 h of the turbine impeller 3 and the side cover 5.
[0021]
An output shaft 10 aligned coaxially with the crankshaft 1 is disposed at the center of the torque converter T. The output shaft 10 is splined to the hub 3h of the turbine impeller 3 and supports the center of the side cover 5. The cylinder 5a is rotatably supported via a bearing bush 18. The output shaft 10 is a main shaft of a multi-stage transmission (not shown).
[0022]
A cylindrical stator shaft 12 for supporting the hub 4h of the stator impeller 4 via a free wheel 11 is disposed on the outer periphery of the output shaft 10, and the relative rotation between the output shaft 10 and the stator shaft 12 is arranged. Is inserted. The outer end portion of the stator shaft 12 is non-rotatably supported by a transmission case (not shown).
[0023]
Thrust needle bearings 37 and 37 'are interposed between the axial end faces of the hub 4h of the stator impeller 4 and the end faces of the hubs 2h and 3h of the pump impeller 2 and the turbine impeller 3 facing these. The axial movement of the turbine impeller 3 and the stator impeller 4 between the pump impeller 2 and the side cover 5 is restricted by the thrust needle bearings 37 and 37 ′ and the thrust needle bearing 36.
[0024]
An auxiliary machine drive shaft 20 coupled to the pump impeller 2 is disposed on the outer periphery of the stator shaft 12 so as to be relatively rotatable. An oil pump (see FIG. (Not shown) is driven.
[0025]
A clutch chamber 22 communicating with the circulation circuit 6 on the outer peripheral side is defined between the turbine impeller 3 and the side cover 5, and a lock capable of directly connecting the turbine impeller 3 and the side cover 5 to the clutch chamber 22. An up clutch L is provided.
[0026]
The turbine impeller 3 will be described in detail with reference to FIGS.
[0027]
Turbine impeller 3, bowl-shaped and annular shell 3s, number of blades 3b to be brazed in position of the inner surface of the shell 3s, 3b ..., it is brazed to the inner surface of the shell 3s these blades 3b the core 3c connecting 3b ... of the annular pressing the radially inner end retainer plate 3r, all blade 3b, and 3b ... intermediate portion mutual and hub 3h is fitted into the center hole of the shell 3s and the retainer plate 3r Consists of
[0028]
A number of positioning recesses 25, 25,... Arranged in the circumferential direction are formed in the shell 3s, and positioning protrusions 26 formed at the radially inner ends of the blades 3b are engaged with the recesses 25.
[0029]
On the other hand, the retainer plate 3r is arranged so that the positioning projections 26 of all the blades 3b, 3b... Further, the retainer plate 3r is provided with positioning notches 27, 27... With which the blades 3b are engaged.
[0030]
Each blade 3b is formed with a positioning projection 28 at an edge facing the core 3c, and a positioning hole 29 with which the positioning projection 28 engages is formed in the core 3c.
[0031]
As clearly shown in FIG. 3, one of the mating surfaces of the shell 3s and the retainer plate 3r (the retainer plate 3r side in the illustrated example) is aligned with the other inward in the radial direction from the positioning recesses 25, 25. An annular protrusion 30 that is projection welded over the entire circumference is formed on the surface. The annular projection 30, when brazing between the shell 3s and the retainer plate 3r, is prevented from flowing out from the inner peripheral edge of the shell 3s brazing material 31 melted, does not inhibit the weld between the shell 3s and the hub 3h Is for.
[0032]
As is apparent from FIG. 3, the center holes of the shell 3s and the retainer plate 3r have substantially the same diameter. The shell 3s and the retainer plate 3r are arranged so that the retainer plate 3r side is brought into contact with the outer surface of the positioning flange 32 protruding from the outer periphery of the hub 3h. At that time, the contact surface 33 of the retainer plate 3r with the positioning flange 32 is cut as necessary. Further, the axial length y of the fitting surface of the hub 3h with the shell 3s and the retainer plate 3r is set substantially equal to the total thickness t of the shell 3s and the retainer plate 3r, and the outer surfaces of the shell 3s and the hub 3h are It is almost flush. The shell 3s and the hub 3h are TIG welded to each other on the outer surface, and the welded portion is indicated by reference numeral 35.
[0033]
Thus, the retainer plate 3r is firmly sandwiched between the positioning flange 32 of the hub 3h and the shell 3s welded to the hub 3h, so that the retainer plate 3r and the shell 3s are brazed. Reinforce effectively. Therefore, the blades 3b, 3b,... Group can be held strongly against the shell 3s to resist a great centrifugal force.
[0034]
Further, the positioning flange 32 of the hub 3h merely supports the retainer plate 3r and does not directly relate to the welding between the shell 3s and the hub 3h. Therefore, the thickness can be reduced, and the outer surface of the shell 3s and the hub 3h can be reduced. Is substantially flush with each other, the axial dimension of the hub 3h can be shortened and the turbine impeller 3 can be made compact.
[0035]
Next, the manufacturing process of the turbine impeller 3 will be described with reference to FIG.
[0036]
First, a core 3c is temporarily attached to a large number of blades 3b, 3b,... Arranged in an annular shape by welding to produce a first semi-finished product 40 comprising the blades 3b, 3b,. As shown in (A), the retainer plate 3r is set at a fixed position on the shell 3s already set on the assembling jig 43, and the retainer plate 3r is placed at the fixed position of the shell 3s. The annular projection 30 (see FIG. 3) of 3r is projection welded to the shell 3s.
[0037]
Next, as shown in FIG. 4 (B), an annular or other shaped brazing material 31 (copper solder) is placed on top of the blades 3b, 3b... And heated as shown in FIG. 4 (C). When the brazing material 31 is melted by heating in the furnace 49, the molten brazing material 31 permeates between the mating surfaces of the shell 3s, blades 3b, 3b..., Retainer plate 3r and core 3c by capillary action. However, since the annular protrusion 30 of the retainer plate 3r is welded to the shell 3s over the entire circumference, the molten brazing material 31 is prevented from flowing radially inward from the protrusion 30. In this way, the brazing material 31 is prevented from entering between the annular protrusions 30 and the mating surfaces of the radially inner shell 3s and the retainer plate 3r. Thereafter, the product is taken out from the heating furnace 49, and the brazing is completed after the brazing material 31 is solidified. Thus, the second semi-finished product 41 including the shell 3s, the blades 3b, 3b..., The shell 3s and the retainer plate 3r is manufactured.
[0038]
Finally, if necessary, the contact surface 33 of the retainer plate 3r with the positioning flange 32 of the hub 3h is appropriately cut, and then the hub 3h and the assembly jig 44 are placed on the assembly jig 44 as shown in FIG. The second semi-finished product 41 is set, that is, as described above, the shell 3s and the retainer plate 3r are fitted to the outer peripheral surface of the hub 3h, and the abutment surface 33 of the retainer plate 3r is placed on the outer surface of the positioning flange 32 of the hub 3h. (See FIG. 3). The outer surfaces of the shell 3s and the hub 3h are welded by the TIG welding machine 50. At this time, even if the brazing material 31 between the shell 3s and the retainer plate 3r is remelted by welding heat, the molten brazing material 31 is , The annular projection 30 connecting the shell 3s and the retainer plate 3r over the entire circumference prevents the portion from flowing out to the weld point between the shell 3s and the hub 3h. Accordingly, between the shell 3s and the hub 3h may Ku satisfactorily welded such to be inhibited to a low material 31. In addition, the annular projection 30 of the retainer plate 3r is welded to the shell 3s, whereby the second semi-finished product 41 including the shell 3s, the blades 3b, 3b,..., The core 3c, and the retainer plate 3r can be easily obtained.
[0039]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0040]
In the second embodiment, except that the retainer plate 3r and the shell 3s are spot-welded at a plurality of locations 51, and the annular protrusion 30 of the retainer plate 3r is put around the entire circumference and pressed against the shell 3s. The configuration is the same as that of the first embodiment, and in FIG. 5, the same reference numerals are assigned to portions corresponding to the first embodiment, and the description thereof is omitted. Also in this case, the annular protrusion 30 may be formed on the shell 3s side.
[0041]
Also in the second embodiment, it is possible to prevent during brazing between the shell 3s and the retainer plate 3r, the molten brazing material 31 from flowing to the inner peripheral edge portion outside the side of the shell 3s by the annular projection 30, thus the shell The welding between 3 s and the hub 3 h can be reliably performed without being obstructed by the brazing material 31.
[0042]
Finally, a third embodiment of the present invention will be described with reference to FIG.
[0043]
In this third embodiment, instead of the annular protrusion 30 of the first and second embodiments, a sealing agent made of oil-based paint is applied to the mating surfaces of both the shell 3s and the inner peripheral end of the retainer plate 3r. The seal films 52 and 52 are formed, and spot welding is performed at several locations 51 between the shell 3s and the retainer plate 3r in order to bring the seal films 52 and 52 into close contact with each other. In this case, the sealing film 52 may be formed only on one mating surface of the shell 3s and the retainer plate 3r, and may be press-contacted to the other mating surface. Since other configurations are the same as those of the first and second embodiments, portions corresponding to those of the first and second embodiments are denoted by the same reference numerals in FIG. 6 and description thereof is omitted.
[0044]
In the third embodiment, when brazing between the shell 3s and the retainer plate 3r, it is possible to prevent the molten brazing material 31 flows out to the inner peripheral edge of the shell 3s by sealing films 52 and 52, thus the shell The welding between 3 s and the hub 3 h can be reliably performed without being obstructed by the brazing material 31.
[0045]
The pump impeller 2 has basically the same configuration as the turbine impeller 3 and is manufactured by the same method.
[0046]
The present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the scope of the invention. For example, the present invention can also be applied to a fluid-coupled pump impeller or turbine impeller that does not have the stator impeller 4.
[0047]
【The invention's effect】
As described above, according to the present invention, a bowl-like and annular shell, a plurality of blades coupled to a fixed position on the inner surface of the shell, and a radial direction of these blades brazed to the inner surface of the shell comprising an annular retainer plate for pressing an inner end portion and a hub which is fitted into the center hole of the shell and the retainer plate, the impeller fluid transmission device, the center hole of the shell and retainer plate are substantially the same diameter together, the shell is TIG welded from the outer surface to the outer periphery of the hub at the inner peripheral edge of the center hole is configured to retainer plate is held between the locating flanges and the shell formed on the outer circumference of the hub, A brazing material blocking means that prevents molten brazing material from flowing out to the TIG weld between the shell and the hub when the brazing between the mating surfaces of the shell and the retainer plate. Since is provided, the retainer plate includes a positioning flange of the hub, would be firmly held between the shell welded to the hub, effectively reinforce the bonding force between the retainer plate and the shell be able to. Also, when brazing between the shell and the retainer plate, the molten brazing material can be prevented from flowing out to the TIG welded portion outside the inner peripheral edge of the shell by the brazing material blocking means, and therefore TIG welding between the shell and the hub is prevented. , It can be carried out reliably without being obstructed by the brazing material.
[0048]
Further, according to the second feature of the present invention, the contact surface of the retainer plate with the positioning flange is machined, and the axial length of the outer peripheral surface of the hub to which the shell and the retainer plate are fitted is Since it is set to be approximately equal to the total thickness of the shell and retainer plate, the positioning flange of the hub that does not directly participate in welding between the shell and the hub can be thinned. Therefore, the axial dimension of the hub can be shortened and the impeller for the fluid transmission device can be made compact.
[0049]
Further, according to the third feature of the present invention, the contact surface of the retainer plate with the positioning flange is cut, and the brazing material blocking means is formed on one of the mating surfaces of the shell and the retainer plate. since the projections are formed by the bringing into close contact with the mating surface of the other over the entire circumference, when brazing between the shell and the retainer plate, until TIG welds of the inner peripheral edge portion outside the side of the shell melted brazing material Outflow can be prevented by the annular protrusion .
[0050]
According to yet a fourth aspect of the present invention, the brazing material blocking means, the shell and by the welding to the mating surface while entire circumference over the other mating surfaces of the annular projections formed on the retainer plate which is configured, when brazing between the shell and retainer plate, that the molten brazing material from flowing to the inner peripheral edge portion outside the side of the shell can be prevented by the annular protrusion. Moreover, a semi-finished product of an impeller comprising a shell, a blade and a retainer plate can be easily obtained by welding the annular protrusion to the mating member.
[0051]
According Furthermore to a fifth aspect of the present invention, the brazing material blocking means, at least one of the mating surfaces of the shell and retainer plate to form a seal film consisting of oil paint in close contact with the other of the mating surfaces, the shell and which is configured by that spot welding at several points between the retainer plates, shells and during brazing between the retainer plate, the sealing membrane from the molten brazing material from flowing to the inner peripheral edge portion outside the side of the shell Can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a torque converter according to a first embodiment of the present invention.
FIG. 2 is a partial plan view of a turbine impeller of the torque converter.
3 is an enlarged cross-sectional view taken along line 3-3 of FIG.
FIG. 4 is an explanatory view of a manufacturing process of the torque converter.
FIG. 5 is a view corresponding to FIG. 3, showing a second embodiment of the present invention.
FIG. 6 is a view corresponding to FIG. 3, showing a third embodiment of the present invention.
[Explanation of symbols]
T ・ ・ ・ ・ ・ ・ Fluid transmission device (torque converter)
3. ... impeller (turbine impeller)
3b ··· Blade 3c ··· Core 3h ··· Hub 3s ··· Shell 30 ··· Ring projection 31 ··· Raw material 32 ··· Positioning flange
33 …… Abutting surface
35 ... TIG welded part
51... Spot welding point 52... Seal film

Claims (5)

A bowl-like and annular shell (3s), a plurality of blades (3b) coupled to a fixed position on the inner surface of the shell (3s), and braided to the inner surface of the shell (3s) an annular retainer plate for pressing a radially inner end portion of the 3b) (3r), the shell (3s) and a hub (3h) which is fitted into the central hole of the retainer plate (3r), blades for hydraulic transmission In the car,
The center hole of the shell (3s) and the retainer plate (3r) has substantially the same diameter, and the shell (3s) is TIG welded from the outer surface to the outer periphery of the hub (3h) at the inner peripheral edge of the center hole. between the hub locating flanges (32) formed on the outer periphery of the (3h) and the shell (3s) is configured to retainer plate (3r) is held,
When brazing between the mating surfaces of the shell (3s) and the retainer plate (3r), the molten brazing material (31) flows out into the TIG weld (35) between the shell (3s) and the hub (3h). An impeller for a fluid transmission device, characterized in that a brazing material blocking means (30, 52) is provided for blocking the movement . The impeller for a fluid transmission device according to claim 1,
The contact surface (33) of the retainer plate (3r) with the positioning flange (32) is cut, and the outer surface of the hub (3h) is fitted with the shell (3s) and the retainer plate (3r). An impeller for a fluid transmission device, wherein an axial length (y) is set to be substantially equal to a total thickness (t) of a shell (3s) and a retainer plate (3r). The impeller for a fluid transmission device according to claim 1 ,
The contact surface (33) of the retainer plate (3r) with the positioning flange (32) is cut, and the brazing material blocking means is provided on one of the mating surfaces of the shell (3s) and the retainer plate (3r). characterized in that it is constructed by that to form the annular projection (30) in close contact with the mating surface of the other over the entire circumference, the fluid transmission device for an impeller. The impeller for a fluid transmission device according to claim 1 ,
The brazing material blocking means is configured by the welding to the shell (3s) and the other mating surface mating surface while the formed annular projections (30) over the entire periphery of the retainer plate (3r) An impeller for a fluid transmission device. The impeller for a fluid transmission device according to claim 1 ,
The brazing material blocking means, at least one of the mating surfaces of the shell (3s) and the retainer plate (3r), forming a seal film (52) consisting of oil paint in close contact with the other of the mating surfaces, the shell (3s) and characterized in that it is constructed by that spot welding with a retainer plate (3r) several places between (51), hydraulic transmission apparatus for an impeller.

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