JP2002286117A - Ring gear-integrated drive plate and its molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ring gear-integrated drive plate facilitating molding work, improving the strength and rigidity of a ring gear portion and maintaining the flexibility of a drive plate portion, and its molding method. SOLUTION: The disc drive plate portion 2, the cylindrical ring gear portion 3 erected at a peripheral edge 4 of the drive plate portion 2 and having teeth 5 at predetermined pitches and a ring flange 7 extending from an open-side end 6 of the ring gear portion 3 to a radial inside are molded integrally with a plate material 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring gear integrated drive plate in which a drive plate portion and a ring gear portion are integrally formed, and a method of forming the same.

[0002]

2. Description of the Related Art As shown in FIG. 6, in a conventional ring gear integrated drive plate 50, a ring gear 51 and a drive plate 52 are separately processed and these ring gears 5 are formed.
1 and the drive plate 52 were fixed by welding and integrated.

However, this requires a lot of processing time and a large weight.
As shown in FIG. 1, a ring gear integrated drive plate 55 in which a ring gear portion 53 and a drive plate portion 54 are integrally formed has been proposed (JP-A-2000-140988).
Reference).

[0004]

However, in the above-described ring gear-integrated drive plate 55, since the ring gear portion 53 is formed of a plate material, the strength and rigidity of the tooth portions 56 are compared with those of the ring gear 51 of FIG. It will be weak.

In order to solve this problem, it is conceivable to increase the thickness of the plate material. However, in this case, the thickness of the drive plate portion 54 also increases, and the function as a drive plate is impaired. That is, the drive plate portion 54 not only transmits the torque but also has a role of absorbing the vibrations of the engine and the transmission, requires a certain degree of flexibility, and cannot be made thick.

When the plate thickness is increased, it is difficult to form the shape of the teeth 56, and it becomes difficult to form the teeth.

As described above, since the strength and rigidity of the tooth portion 56 are restricted, the conventional ring gear integrated drive plate 5 is used.
In No. 5, the applicable vehicle is limited to a vehicle having a relatively small torque.

Accordingly, the present invention has been devised to solve the above-mentioned problem, and an object of the present invention is to perform molding easily, to secure the flexibility of the drive plate portion and to reduce the strength of the ring gear portion. An object of the present invention is to provide a ring gear integrated drive plate capable of increasing rigidity and a method of forming the same.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is a cylinder having a disk-shaped drive plate, and a cylinder having teeth provided at a predetermined pitch on a peripheral edge of the drive plate. A ring gear-integrated drive plate formed integrally with a plate-shaped ring gear portion and a ring-shaped flange extending radially inward from an open end of the ring gear portion.

According to the above configuration, since the flange is continuously provided on the ring gear portion, the strength and rigidity of the ring gear portion can be increased, and the thickness of the drive plate portion can be secured without increasing the thickness. it can.

According to a second aspect of the present invention, a preformed product, which has been previously formed into a cylindrical shape with a bottom, is inserted into a concave portion formed on a die provided on a lower base and having a tooth profile on an inner peripheral wall surface. Is filled with a liquid, and a punch provided on the upper base and having a convex portion formed at a lower end surface is lowered from the upper portion thereof, and the liquid is compressed and pressurized to form the cylindrical portion of the preform into the tooth shape of the die. A method for forming a drive plate with a ring gear integrated, wherein the upper end of the cylindrical portion is bent radially inward while being pressed against the ring gear.

The punch is provided with a liquid flow path for allowing the liquid to flow to the outside and an accumulator for adjusting the pressure of the liquid, and a ring gear integrated with which the upper base descends while maintaining the pressure of the liquid at a predetermined value. The method of forming the drive plate is preferred.

[0013]

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

FIG. 1 is a perspective view showing a preferred embodiment of a ring gear integrated drive plate according to the present invention, and FIG. 2 is a sectional view showing a preferred embodiment of a ring gear integrated drive plate according to the present invention. FIG. 3 is a cross-sectional view showing a mold for forming the ring gear integrated drive plate according to the present invention, and FIG. 4 is a cross-sectional view showing a state when the mold for forming the ring gear integrated drive plate according to the present invention is formed. is there.

First, the configuration of the ring gear integrated drive plate will be described.

As shown in FIGS. 1 and 2, the ring gear integrated drive plate 1 has a disk-shaped drive plate portion 2. A cylindrical ring gear portion 3 is provided upright on the peripheral edge portion 4 of the drive plate portion 2 so as to extend in the thickness direction of the drive plate portion 2. The teeth 5 are formed on the outer periphery of the ring gear 3 at a predetermined pitch. A ring-shaped flange 7 is formed at an open end 6 of the ring gear 3 opposite to the drive plate 2. The flange 7 is formed in a donut shape extending inward in the radial direction.

The drive plate 2, ring gear 3 and flange 7 are integrally formed by deep drawing a plate material 8.

Next, the structure of a forming apparatus for forming the ring gear integrated drive plate 1 having the above structure will be described.

The molding apparatus 9 has a lower table 11 and an upper table 12, and a die 14 is provided on the upper part of the lower table 11. A recess 15 is formed on the upper surface of the die 14.
The recess 15 is formed in a cylindrical shape having a diameter substantially equal to the outer diameter of the ring gear integrated drive plate 1.
A tooth shape 16 is formed on the inner peripheral wall surface of. This tooth profile 1
6 is for forming the teeth 5 of the ring gear portion 3.

A knockout mold 26 for taking out the molded ring gear integrated drive plate 1 is provided on the bottom surface of the concave portion 15 so as to be movable up and down. Knockout mold 26 has a cross-sectional area smaller than the bottom area of recess 15.

In the lower part of the upper base 12, a recess 15 of the die 14 is provided.
Is provided with a cylindrical punch 17 to be inserted into the punch. On the lower end surface of the punch 17, a columnar projection 18 is formed. The convex portion 18 has an outer diameter equal to the diameter of the inner peripheral surface of the flange 7 of the ring gear integrated drive plate 1 to be formed. A spline 19 is formed on the outer peripheral wall surface of the punch 17 so as to mesh with the tooth profile 16 of the concave portion 15, and serves as a guide for lowering the punch 17.

The punch 17 is provided with a liquid channel 21 for allowing a liquid r to be described later to flow out. One end of the liquid flow path 21 is open at the lower end surface of the projection 18 of the punch 17, and an accumulator 22 is connected to the other end of the liquid flow path 21.

The accumulator 22 controls the pressure of the liquid r in the liquid flow path 21, ie, the recess 15 of the die 14 and the punch 1.
When the pressure of the liquid r filled in the section defined by the lower end face of the liquid 7 exceeds a predetermined value, the liquid r is guided into the accumulator 22.

Next, the step of forming the ring gear-integrated drive plate 1 using the forming apparatus 9 having the above-described structure will be described.
The operation of will be described.

First, the plate material 8 is deep drawn into a bottomed cylinder having a bottom plate portion 23 and a tubular portion 24, and a preformed product (FIG. 3)
25) is formed in advance.

Then, as shown in FIG. 3, the preform 25 is set in the concave portion 15 of the die 14 so that the bottom plate portion 23 faces downward. Thereafter, the inside of the preform 25 is filled with a liquid such as water.

In this step, the preform 25 may be set in the recess 15 after the recess 15 is filled with the liquid r in advance.

Thereafter, the upper table 12 is lowered, and the punch 1
7 is lowered. As the descent proceeds, the peripheral edge of the lower end of the punch 17 comes into contact with the upper end of the cylindrical portion 24 of the preform 25, and the liquid r is sealed between the preform 25 and the punch 17. Further, as the descent proceeds, the upper part of the cylindrical portion 24 of the preform 25 is bent inward, the liquid r is compressed, and the pressure increases.

When the pressure of the liquid r rises to a predetermined value, the accumulator 22 operates and the liquid r is guided to the accumulator 22 via the liquid flow path 21. Thus, the pressure of the liquid r in the preform 25 can be maintained at a predetermined value.

The pressure of the liquid r causes the cylindrical portion 24
Are pressed toward the tooth profile 16 and the teeth 5 are formed.
As described above, since the pressure is applied from the inside of the preform 25 by the liquid r, the shape of the teeth 5 is well formed, and the buckling of the cylindrical portion 24 due to the lowering of the punch 17 can be prevented.

The punch 17 descends to the position shown in FIG. At this point, the upper portion of the cylindrical portion 24 is pressed from above by the punch 17 and pressed from below by the pressure of the liquid r, so that the cylindrical portion 24 is bent in a plane along the periphery of the lower end of the punch 17, A smooth flange 7 without undulation can be formed. Thereby, the strength and rigidity of the teeth 5 can be efficiently and reliably increased.

Then, after the punch 17 is raised, the knockout mold 26 is raised, and the completed ring gear integrated drive plate 1 is taken out.

This ring gear integrated drive plate 1
5, is installed between the engine 31 and the torque converter 32, and is attached to the crankshaft 33 and the torque converter 32 via bolts 34 and 35, as shown in FIG. When the engine is started, the pinion 36 jumps into the ring gear 3, the crankshaft 33 rotates via the drive plate 2, and the engine 31 is started.

At this time, according to the ring gear integrated drive plate 1 described above, since the strength and rigidity of the ring gear portion 3 are enhanced by the flange 7, the present invention can be applied to a vehicle having a higher torque. Specifically, when the width of the flange 7 is about 10 mm, the strength of the ring gear portion 3 is about 1.5 times as high as that without the flange.

After the engine 31 is started, the pinion 36 returns to its original state, and the torque of the engine 31 is transmitted to the torque converter 32 and the transmission via the drive plate 2. At this time, according to the ring gear integrated drive plate 1 described above, since the plate thickness of the drive plate portion 2 is not increased, the strength thereof is not increased more than necessary, and the drive plate portion 2 has an appropriate flexibility. 31 and transmission vibrations can be absorbed.

Further, if a mold is used for forming the flange 7, the mold cannot be taken out after the molding, which is impossible. However, in the present invention, the liquid r is used to extend inward in the radial direction. The flange 7 can be easily formed.

[0037]

In summary, according to the present invention, since the flange is continuously provided on the ring gear portion, the strength and rigidity of the ring gear portion can be increased, so that the present invention can be applied to a vehicle having a higher torque and the plate thickness can be reduced. Since it is not necessary to make it thicker, the flexibility of the drive plate can be secured,
It has an excellent effect of absorbing the vibration of the engine and transmission.

Further, according to the present invention, molding can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a ring gear integrated drive plate according to the present invention.

FIG. 2 is a sectional view showing a preferred embodiment of a ring gear integrated drive plate according to the present invention.

FIG. 3 is a sectional view showing a mold for molding the ring gear integrated drive plate according to the present invention.

FIG. 4 is a cross-sectional view showing a state during molding of a mold for molding the ring gear integrated drive plate according to the present invention.

FIG. 5 is a sectional view showing a use state of the ring gear integrated drive plate according to the present invention.

FIG. 6 is a perspective view and a sectional view showing a conventional ring gear integrated drive plate.

FIG. 7 is a perspective view and a sectional view showing another conventional ring gear-integrated drive plate.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Ring gear integrated drive plate 2 Drive plate portion 3 Ring gear portion 4 Peripheral edge portion (of drive plate portion) 5 Teeth 6 Open end portion (of ring gear portion) 7 Flange 8 Plate material 11 Lower base 12 Upper base 14 Die 15 Concave part 17 Punch 18 Convex part Reference Signs List 21 liquid flow path 22 accumulator 24 tubular part 25 preformed product

────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl. ⁷ identification mark FI theme Court Bu (reference) B21K 1/30 B21K 1/30 B (72 ) inventor Shigeki Kondo Fujisawa, Kanagawa Prefecture Endo 2003 address 1 press industry Inside the Fujisawa Plant Co., Ltd. (72) Inventor Hirotaka Makino 2003-1, Endosuji, Fujisawa City, Kanagawa Prefecture Press Industry Co., Ltd. Fujisawa Plant Co., Ltd. F term (reference) 3J030 AC02 BA01 BB16 BC02 BC05 CA10 4E087 AA00 CA09 EB03 HA02

Claims (3)

[Claims] 1. A disk-shaped drive plate portion, a cylindrical ring gear portion erected on a peripheral portion of the drive plate portion and having teeth at a predetermined pitch, and radially inward from an open end of the ring gear portion. A ring gear-integrated drive plate, wherein an extending ring-shaped flange and a plate material are integrally formed. 2. A preform, which has been previously formed into a cylindrical shape with a bottom, is inserted into a recess formed in a die provided on a lower base and having a tooth profile on an inner peripheral wall surface, and a liquid is poured into the preform. Filling, lowering a punch provided with a convex portion on the lower surface provided on the upper base from the top, compressing and pressing the liquid and pressing the cylindrical portion of the preformed product against the tooth profile of the die, A method of forming a ring gear-integrated drive plate, wherein the upper end of the cylindrical portion is bent radially inward. 3. The punch according to claim 1, wherein a liquid flow path for allowing the liquid to flow out and an accumulator for adjusting the pressure of the liquid are provided, and the upper table is lowered while maintaining the pressure of the liquid at a predetermined value. 3. The method for forming the ring gear integrated drive plate according to 2.