JP3008674B2 - Method for manufacturing blade of fluid transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade of a fluid transmission and a method of manufacturing the same.

[0002]

2. Description of the Related Art A fluid transmission device such as a torque converter and a fluid coupling used in an automatic transmission of a vehicle includes a shell in which a number of blade mounting grooves are formed substantially radially on an inner peripheral surface of a semi-annular member. And a number of blades each having a claw portion to be fitted in these blade mounting grooves. Such a conventional fluid transmission blade is disclosed in Japanese Patent Application Laid-Open No. 61-82067. The blade of the fluid transmission device shown in this figure is chamfered by press working at the end of the claw portion of the blade fitted on the shell. That is, the blade is press-formed into a predetermined shape from a plate material by a press machine. However, as shown in FIG. 5, the press processing forms a burr 52 on the blade claw portion 50. Since the work of assembling into the shell is troublesome, the edge of the last one of the blade claws 50 that is fitted into the groove is chamfered by pressing between the lower mold 54 and the upper mold 56 shown in FIG. A chamfered portion 50a as shown in FIG. As a result, the burr 52 is removed, and the work of fitting the blade into the shell is performed.
The chamfered portion 50a can be smoothly and easily guided by the chamfered portion 50a.

[0003]

However, the blade of the above-mentioned conventional fluid transmission device has a problem that the manufacturing cost is increased. That is, in the chamfering press working, as shown in FIG. 6, the burr 52 may be crushed into chips and become press waste 52 a, so that a cleaning process for removing the press waste 52 a adhered to the blade is performed. Required, and the mold must be cleaned frequently, which adds to the cost of blade manufacturing. If the chamfering of the blade is performed by a deburring machine such as a grinding type, a cutting type, and a shot blasting type, the blade cleaning step is not required, but a deburring machine and a process for this are required. Similarly, there is a problem that the manufacturing cost of the blade increases. In addition,
In order to facilitate the work of assembling the blade to the shell, it is conceivable that the blade mounting groove of the shell is formed to have a large size in consideration of the generation of the burr 52, and the work of removing the burr 52 and cleaning the blade is omitted. However, in this method, although the blade can be manufactured at a low cost, the blade falls down in the assembling work, and the blade cannot be assembled with a predetermined positional accuracy with respect to the shell, and the assembly can be performed. However, there is another problem that the blades become loose during operation. An object of the present invention is to solve such a problem.

[0004]

According to the present invention, a thin portion is formed in a nail portion by coining a nail portion of a blade using a press machine, and then the thin portion is cut into a predetermined shape. The above problem is solved by crushing the burr generated by the press with a press. That is, the blade of the fluid transmission device according to the present invention includes a claw portion (12) of the blade.
A thin portion (12b) having a smaller thickness than the other portion of the claw portion is formed on the distal end side of the member so that the burr (16) at the edge of the thin portion (12b) does not protrude in the thickness direction. Crushed. In addition, the manufacturing method includes a coining step of pressing a claw portion of a blade press-formed into a predetermined shape from a plate material so that a tip side of the blade is thinner than other portions, and a tip end side of the claw portion. A press cutting step of cutting into a predetermined shape and a burr crushing step of crushing burrs generated by the press cutting step to a thickness of a thin portion by press working are sequentially performed. In addition, the code | symbol in a parenthesis shows the corresponding member of an Example.

[0005]

The blade is press-formed from a plate into a predetermined shape, and is kept connected to the plate at a portion serving as a nail portion. From this state, the tip portion of the portion serving as the claw portion is coined (coining step). As a result, the tip of the claw portion is compressed, and the thickness of the portion subjected to coining is made smaller than the thickness of the other portions not subjected to coining. Next, press cutting is performed so that the coining portion of the nail portion has a predetermined shape (press cutting step). Thereby, the blade is separated from the plate. In this case, burrs are less likely to be generated at the cut portion of the pawl portion. That is, the coined part is
Due to the work hardening, burrs are less likely to appear during the press cutting process. Nevertheless, since relatively small burrs may be generated, press working for pressing the burrs generated in the press cutting step is performed (burr crushing step). Since the coined portion of the blade manufactured in this manner has a small thickness, the work of assembling the blade to the shell becomes easy. Further, at the time of the assembling work, the burr is pushed into the groove of the shell while being integrated with the blade, so that the burr does not become chipped. Therefore, the hydraulic control device, the bearing device, and the like are not damaged by the chip-shaped burrs.

[0006]

FIG. 1 shows an embodiment of the present invention. Blade 10
Is first formed into a predetermined shape from a long plate by a molding die (not shown) of a press machine. At this point,
The blade 10 is connected to the plate material at the distal end side of the portion to be the claws 12 and 14, and is not separated. Next, the plate material is fed, and the blade 10 is sequentially fed to a processing position between the upper die 20 and the lower die 22 shown in FIG. 1A, and the blade claws 12 are pressed by these (coining step). . That is, as shown in an enlarged view in FIG. 2A, the tip of the blade pawl portion 12 is compressed,
A thin portion 12b is formed. As a result, the blade pawl portion 12 has a shape having a thick portion 12a not subjected to coining, a thin portion 12b subjected to coining, and an inclined portion 12c. FIG. 1A shows a state in which coining has been completed. As shown in FIG.
The thin portion 12b has a thickness of 0.2 to 0.2 on one side of the thick portion 12a.
It is compressed so as to be 0.3 mm thin. Thus, the blade 10 is in a state where the thin portion 12b is hardened.

Next, the plate material is further fed to the blade 1
0 is the upper mold 24 and the lower mold 26 for cutting shown in FIG.
The thinned portion 12b of the blade claw portion 12 is cut into a predetermined shape by these (press cutting process). As a result, the burr 16 comes out at the cut portion, but the burr 16 is hard to come out because the thin-walled portion 12b is work-hardened, and the amount of the burr 16 is smaller than that when the work-hardening is not performed. It is said. The blade 10 has a similar blade pawl 14 (see FIG. 2), but this portion is still connected to the plate.

Next, the plate material is fed again and the blade 10
Is sequentially fed to a processing position between the upper die 30 and the lower die 32,
As a result, as shown in FIG. 1C, the burr 16 is pressed (burr crushing step). That is, the burr 16
Is a state in which it protrudes rightward in the figure as shown in FIG. 1C from a state protruding downward in the figure as shown in FIG. 1B (a state in which it does not protrude from the thickness dimension of the thin portion 2b) )
It is pressed so that it becomes. Next, blade pawl 1
4 is cut from the plate material, and the press working of the blade 10 is completed.

Next, a procedure for assembling the blade 10 manufactured as described above into the shell 18 will be described. As shown in FIG. 3, the shell 18 has a number of blade mounting grooves 18a radially formed on the inner peripheral surface thereof. The blade mounting groove 18a is formed concentrically with a similar blade mounting groove 18b on the inner peripheral side as shown in FIG. The groove width w of the blade mounting groove 18a is
Is substantially equal to the thickness t of the thick portion 12a. Therefore, a clearance s is formed on both sides between the blade mounting groove 18a of the shell 18 and the thin portion 12b of the blade 10. Also, the burr 16 is
The blade mounting groove 18a protrudes in the depth direction, and has a relational arrangement that does not affect the clearance s. The blade 10 is connected to the blade mounting groove 18 b of the shell 18.
The claw portion 14 is fitted into the blade mounting groove 18b on the inner peripheral side from the state of being positioned above. Next, in the figure, the right claws 12 are fitted into the blade mounting grooves 18a on the outer peripheral side. At this time, since the thin portion 12b of the blade 10 is fitted into the blade mounting groove 18a as a guide, the blade assembling operation can be easily performed. After the blade 10 is temporarily assembled to the shell 18 in this manner, the upper part of the blade 10 in the figure is lightly tapped with a hammer and driven into the shell 18 to a predetermined position to perform final assembly. As a result, the burr 16 is confined in the blade mounting groove 18a of the shell 18, so that troubles such as the burr 16 being mixed into the fluid during operation of the fluid transmission device can be prevented. .

[0010]

As described above, according to the present invention, the blade of the fluid transmission can be manufactured at low cost.
Also, burrs generated on the blade do not hinder assembly, and burrs do not mix into the fluid of the fluid transmission device.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a processing order of blades.

FIG. 2 is a view showing a processing position of a blade pawl.

FIG. 3 is a diagram illustrating a relationship between a blade and a blade mounting groove of a shell.

FIG. 4 is a diagram showing a state where a blade is assembled to a shell.

FIG. 5 is a view showing a state in which burrs have appeared on a blade by press molding.

FIG. 6 is a diagram showing a conventional blade chamfering process.

FIG. 7 shows a conventional chamfered blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Blade 12 Claw part 12a Thick part 12b Thin part 14 Claw part 16 Burr 18 Shell

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makoto Umezawa Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture (56) References JP-A-1-171715 (JP, A) JP-A-63- 203219 (JP, A) JP-A-62-28031 (JP, A) JP-A-58-106657 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 41/28 F16D 33 / 18-33/20 B21D 28/00-28/36 B21D 22/02 B21D 53/00 B21D 53/78

Claims (1)

(57) [Claims] 1. Fluids for torque converters, fluid couplings, etc.
A method for manufacturing a blade of a transmission, comprising:
Press the tab of the blade in the pressed state
Press so that the tip side is thinner than the other parts
Coining process and cutting the tip side of the nail part into a predetermined shape
Press cutting process and the press cutting process caused by
Burr that crushes burrs to the thickness of thin part by pressing
Manufacturing of the blade of the fluid transmission device which sequentially performs the crushing process and
Construction method .