JPS62155368A - Slit structure of fluid torque converter - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a trouble due to drop of burr, by a method wherein a curved part is formed on the end surface part of a slit having burr by press working. CONSTITUTION:An inner core 1 is manufactured in a way to blank a sheet metal in an annular shape by press working, and plural slits 2 are bored in the inner core 1 by press blanking. In this case, a sagging part 3 is formed to the press blanked upper end surface of the slit 2, and burr 5 is formed to the lower end surface thereof. Meanwhile, a blade 6 is also manufactured in a way to blank a sheet metal by press working, and plural inner tube parts 11 are formed to an inner edge 10. A curved surface 12 is formed, within the same mould as a mould within which the slits 2 are formed, in the end surface part, having width wide than the insertion width of a tub part 11 of the blade 6, of a portion where burr 5 of the slit 12 is formed. This constitution prevents production of cuttings due to drop of burr even if the tub part 11 is bent.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an inner core or outer shell of a fluid torque converter, and more particularly to a slit structure for inserting a slit blade in the inner core or (turbine) outer shell.

(b) Prior art In general, a fluid torque converter has a pump impeller on the drive side, a turbine impeller on the driven side, and a stake impeller fixed via a casing one-way clutch in a casing. There is. Both the pump wheel and the turbine wheel are composed of an outer shell serving as an outer case, a plurality of blades attached to the inside of the outer shell, and an inner core that is coupled to the tab portion of each blade. The conventional inner core 1 is shown in Fig. 4(a).
.

As shown in (b) and (c), it is manufactured by punching out a donut shape from a sheet metal by press working, and further 1. A plurality of slits 2 are formed in the inner core 1 by press punching. At this time, a sagging portion 3 is formed on the press punched upper end surface of the slit 2.
is formed, and a burr 5 is formed on the lower end surface of the press punch. On the other hand, the blade 6 is also manufactured by punching out a sheet metal by press working, and the outer edge 7, which is formed in an arc shape along the inner peripheral surface of the peripheral wall of the outer shell (not shown), has a blade 6 of the outer shell. An outer tab portion 9 is formed to be inserted into the mounting slit. Further, the blade 6 is provided with a plurality of inner side tab portions 11 protruding from the inner edge 10 thereof.

(c) Problems to be Solved by the Invention The above-mentioned conventional fluid torque converter has the following problems in the pump impeller:
After inserting the inner core 1 into the blade 6, insert the slit 2
The tab portion 11 of the blade 6 protruding from the inner core 1 is bent and caulked to connect the inner core 1 and the blade 6.

However, when the tab portion 11 of the blade 6 is bent and caulked, burrs 5 generated during press punching are formed on the end face portion of the slit 2 of the inner core 1, and this burr 5 is caused by the force when bending the tab portion 11. It rubs and falls, generating chips.

These chips then entered the hydraulic circuit of the automatic transmission and caused valve sticking.

In addition, in the turbine wheel of a fluid torque converter, after the tab portion of the blade is inserted into the slit of the turbine outer shell, the tab portion protruding from the slit is bent and caulked to be fixed to the outer shell. As with pump impellers, burrs fall and cause valve stick.

Therefore, an object of the present invention is to solve the above-mentioned problems by forming a rounded surface on the slit end face portion having burrs.

- Means for Solving the Problem The present invention has been made in view of the above-mentioned circumstances, and as shown in FIGS. A plurality of slits 2 are further formed in the inner core 1 (or outer shell) punched out by press punching. At this time, a sagging portion 3 is formed on the press punched upper end surface of the slit 2, and a burr 5 is formed on the press punched lower end surface, but the slit 2 is formed on the end surface portion of the slit 2 where the burr 5 is formed. The rounded surface 12 is press-formed in the same mold.

After inserting the inner core 1 into the blade 6, the tab portion 11 of the blade 6 protruding from the slit 2 is folded or bent, and the inner core 1 and the blade 6 are tightly knitted.

(e) Effect Of the slit 2 in which the burr 5 is formed by press punching, at least the end face portion that is wider than the insertion width of the tab portion 11 of the blade 6 has a rounded surface 12 formed in the same mold in which the slit 2 was formed. is formed, so even if the tab portion 11 of the blade 6 protruding from the slit 2 is bent and caulked after the inner core 1 is inserted into the blade 6, chips due to falling burrs are not generated.

(F) Embodiments Hereinafter, embodiments in which the present invention is applied to an inner core of a fluid torque converter will be described with reference to the drawings. The inner core mentioned here is not only the inner core of the pump, but also
It also includes the inner core of the turbine. In the drawings, the same parts as those of the conventional inner core are given the same reference numerals.

As shown in FIGS. 1 and 2, the inner core 1 is manufactured by stamping a sheet metal into a donut shape, and further includes:
A plurality of slits 2 are bored in the inner core 1 by press punching. At this time, a sagging portion 3 is formed on the press punched upper end surface of the slit 2, and a burr 5 is formed on the press punched lower end surface. On the other hand, the blade 6 is also manufactured by punching out sheet metal using a press process, and the outer shell (
An outer side tab portion 9 that is inserted into the blade 6 attachment slit of the outer shell is formed on the outer edge 7 formed in an arc shape along the inner peripheral surface of the peripheral wall (not shown).
The blade 6 also has an inner edge 10 on its inner edge 10.
A plurality of inner side tab portions 11 are provided that protrude from 0. Then, in the same mold in which the slit 2 was formed, a rounded surface 12 is formed on at least the end face portion of the portion where the burr 5 of the slit 12 is formed, which is wider than the insertion width of the tab portion 11 of the blade 6. to be done. For this reason, the second
As shown in the figure, a telescoping type lower mold 13 is placed on the lower end surface on which the burr 5 is formed so as to be in contact with the end corner of the slit 2.
An upper mold punch 15 is arranged in the upper mold so as to face the lower mold 13 and press strongly around the slit 2. In addition to the upper mold punch 15, the upper mold may be a ring-shaped stripper integrally formed around the entire circumference. Then, when the upper mold punch 15 is strongly pressed, the end surface portion of the portion where the burr 5 is formed that comes into contact with the lower mold 13 is pressed, the burr 5 is crushed, and the rounded surface 12 is formed. After inserting the inner core 1 having the slit 2 with the rounded surface 12 into the blade 6, the tab portion 11 of the blade 6 protruding from the slit 2 is as shown in FIGS. 1(b) and 1(e). It should be bent and crimped. At this time, the tab portion 11 comes into close contact with the rounded surface 12 of the slit 2, so that the inner core 1 and the blade 6 are tightly coupled.

Although the embodiments in which the present invention is applied to the inner core of a fluid torque converter have been described above, it is of course possible to apply the present invention to a turbine outer shell of a fluid torque converter. In this case, as shown in FIG. 3(a), a slit 19 is formed in the turbine outer shell at 17 by press punching.

As shown in FIG. 3(b), a sagging portion 20 is formed on the press punched upper end surface of the slit 19, and a burr 21 is formed on the lower end surface. As shown in FIG. 3(c), the end face portion of the slit 19 having the burr 21 is formed into a rounded surface 23 in the same mold 22 in which the slit 19 was formed.

(g) As described in detail, according to the present invention, the rounded surfaces 12, 2g are formed on the end face portions of the slits 1, 2, 19 having the burrs 5 by press processing, so that the blade 6 is Even if the tab portion 11 of the blade 6 protruding from the slit 2 is bent and caulked after inserting the blade into the inner core 1 or outer shell 17, chips will not be generated due to falling burrs. There is nothing that can get inside and cause valve stick.

Furthermore, since the tab portion 12 is bent and caulked along the radiuses 12 and 23, the blade 6 can be tightly and reliably connected to the inner core 1 or the outer shell 17.

[Brief explanation of drawings]

FIG. 1(a) is a partially cutaway perspective view showing an embodiment of the inner core of a fluid torque converter, FIG. 1(b') is a partially cutaway perspective view showing the state of connection between the inner core and the blade, Figure 1 (C) is a partially cutaway enlarged cross-sectional view taken along line I-I in Figure 1 (b), Figure 2 is an explanatory diagram of the formation of the radiused surface of the slit, and Figure 3 (a) is the turbine outer shell. FIG. 3(b) is an enlarged sectional view taken along line ll-11r of FIG. 3(a), FIG. 3(c) is a partially cutaway perspective view showing an embodiment applied to
4(a) is a partially cutaway perspective view of the inner core of a conventional fluid torque converter, and FIG. 4(b) is a diagram showing the connection between the conventional fluid torque converter inner core and the blade. FIG. 4(c) is a partially cutaway perspective view showing the state, and FIG. 1. Inner core, 2.. Slit, 5.
...Flash, 6..Blade, 11..Tab part, 12..Round surface, 13..Lower mold,
15...Upper mold punch, 17...(Turbine) outer shell, 2 Tobari, 23...Round surface. (a) In Figure 3) 2?

Claims (1)

[Claims] (1) In the inner core or outer shell of a fluid torque converter, a slit into which a plurality of tab portions formed on a blade are inserted, is manufactured by press punching, and burrs are generated on the end face portion of the slit, and the slit has the burr. A slit structure for a fluid torque converter characterized in that a rounded surface is formed on the end face by pressing with a press.