JPS62142040A - Production of member having tooth part with groove for snap ring and its device - Google Patents

Abstract

PURPOSE:To form a tooth part and the groove for a snap ring simultaneously with their forging on a flange part and to improve the product accuracy and productivity by functioning the mid part die and plural punches which are arranged between the upper part and lower part dies simultaneously. CONSTITUTION:The forging equipment is used which arranges an upper part die 4 for forming tooth crest part 2a at the inner side of a clutch retainer 1, a lower part die 5 for forming tooth crest parts 2b, a mid part die 6 for forming snap ring grooves 3, and plural punches for forming a flange. The forming of the tooth art 2 and the groove 3 for snap ring is simultaneously performed by this equipment and both side walls 3a, 3b of the groove 3 for snap ring are formed as the sheared face bulging to the inner part of the tooth crest parts 2a, 2b. The product quality and productivity can be improved by forming in this method.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for manufacturing members such as clutch retainers used in automatic transmission blades of automobiles.

[Prior Art] δ As shown in Fig. γ, a clutch retainer a is installed in an automatic transmission of an automobile, and a snap ring b is fitted therein to prevent the clutch plate C from moving in the axial direction. In this case, a groove d into which the snap ring is fitted is formed on the inner periphery of the clutch retainer a, but after a predetermined tooth portion e into which the clutch plate C is inserted is formed, the groove d is formed on the inner ridge of the tooth portion. It is formed by cutting or forging.

[Problem that the invention seeks to solve]

Conventional as above! ! According to the dipping method, the groove for the snap ring is machined after the teeth are formed, resulting in problems such as poor finishing accuracy of the teeth, an increase in the number of steps, and the need for a special machine for groove machining. there were.

The present invention was made in order to solve these conventional problems, and provides a method and apparatus for manufacturing a clutch retainer (and similar members) in which the teeth and the snap ring groove are press-formed at the same time. The purpose is to provide

[Means for solving problems]

In order to achieve this object, the present invention includes an outward flange formed on one end side of a cylindrical drum made of sheet metal, a toothed portion having a substantially trapezoidal cross section formed on this flange, and an inner crest of the toothed portion. The gist of the present invention is a method for manufacturing a member having a snap ring groove in the tooth portion, in which the tooth portion and the snap ring groove are press-formed at the same time. It has an upper die for forming the tooth portion and a lower die, and a middle die for forming the snap ring groove between these dies, and a die for pressing the flange. The gist is a manufacturing device that includes a plurality of punches.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments.

FIG. 1 shows a partial perspective view of a clutch retainer 1 manufactured according to the present invention, in which an outward flange 1a is formed at one end of a cylindrical drum, and teeth 2 are formed on the flange portion. The toothed portion 2 has a substantially trapezoidal cross-sectional shape, and the inward chevron portion of the flange 1a is divided into two toothed portions 2a and 2b. The cross-sectional shape of the crest is smaller and narrower than that of the tooth ridge 2a on the inner side of 2bt.

The recessed portion sandwiched between the two toothed portions 2a and 2b serves as a snap ring groove 3.

In press forming the clutch retainer 1 having such a structure, the present invention provides an upper die 4 for forming the toothed portion 2a inside the clutch retainer 1, and a toothed portion 2b as shown in FIG. It has a lower die 5 for forming the snap ring groove 3 and a middle die 6 for forming the snap ring groove 3 between the upper die 4 and the lower die 5. A forging device equipped with a pan differential is used 1. This forging device simultaneously forms the teeth 2 and the snap ring groove 3, and as shown in Fig. 3, both sides of the snap ring groove 3 are formed. wall 3
a and 3b are formed as sheared surfaces that are sheared by the inward bulge of the gear tooth portions 2a and 2b.

When the tooth portion 2 and the snap ring groove 3 are molded simultaneously in this way, the outer tooth ridge portion 6a of the middle die 6 is fitted into the snap ring groove 3, so the clutch retainer 1 is removed after molding. However, in the case of the present invention, the payout can be made easily. That is, as shown in FIG.
The tooth thickness '6a of a is set to be larger than the tooth thickness 128 of the tooth ridge portion 2a in order to form the predetermined snap ring groove 3, but the trough portion sandwiched between the tooth ridge portions 2b is Since the tooth thickness is set to be smaller than the tooth thickness 15a of the outer tooth ridge portion 5a of the lower die 5 to be formed, when the middle die 6 is rotated by a half pitch after forming, the outer tooth of the middle die 6 as shown in FIG. The crest 6a is removed from the snap ring groove 3 and moved to a position where it overlaps the outer peripheral gear 5a of the lower die 5. Therefore, if the knock ring 1-0 is raised in this state, the clutch retainer 1 can be removed from the upper die 4, the middle die 6, and the lower die 5, and the clutch retainer 1 can be taken out. Note that the punch 7 is moved outward in advance.

As a means for rotating the middle die 6 by a half pitch, the sixth
Driver pin 8 with the tip bent as shown in the figure
The driver pin 8 is raised and the tip 8a is inserted into the hole 6b formed in the middle die 6.
By pushing the inclined wall 6C, the middle die 6 is moved to the arrow A
can be moved in the direction. By appropriately setting this movement stage, the middle die 6 can be rotated by exactly half a pitch. Conversely, when the driver pin 8 is lowered, the middle die 6 can be returned to its original position by moving laterally.

In the above embodiment, both side walls of the snap ring groove were formed as sheared surfaces, but as shown in FIG.
The side wall 3'b on the side in contact with the lower die 5' and the lower die 5' may be formed by shearing, and the other side wall 3'a may be formed by bending.

This allows easy molding by setting a large clearance C' between the pan diff' and the middle die 6', and it is possible to increase the strength of the 'li3' for the snap ring. .

Furthermore, in the above embodiment, an example was shown in which a snap ring groove was formed on the inner surface of the flange, but in contrast to this, a punch was placed on the inner surface and a die was placed on the outer surface to form the predetermined teeth and grooves. It can also be applied when forming a snap ring groove on the outer surface. The present invention can be widely applied not only to clutch retainers but also to members having teeth and snap ring grooves.

〔Effect of the invention〕

As explained above, according to the present invention, a member having teeth and a snap ring groove, such as a clutch retainer, can be simultaneously formed by forging, and the member can be easily taken out after forming. As a result, production efficiency is significantly improved, products with high viscosity can be provided, and a dedicated machine for full processing is not required.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of a component manufactured according to the invention;
Figure 2 is a sectional view of the main parts of the manufacturing equipment, Figure 3 is
4 and 5 are cross-sectional views of the flange portion of the part, and FIGS. Figure 7 is
FIG. 8 is a sectional view showing another example of a groove for a snap ring.
FIG. 3 is a sectional view of main parts showing an example of use of the clutch retainer. DESCRIPTION OF SYMBOLS 1...Clutch retainer, 1a...Outward flange, 2...Tooth portion, 2a, 2b...Tooth portion, 3...Snap ring groove, 4...Upper die, 5. ...Lower die, 6... Middle die, 6a... Outer tooth ridge, 7
...Punch, 8...Driver pin, 9...Knockout. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6r! R @Figure 7 @Figure S

Claims (5)

[Claims] (1) An outward flange is formed on one end side of a cylindrical drum made of sheet metal, a toothed portion having an approximately trapezoidal cross-sectional shape is formed on this flange, and a groove for a snap ring is provided on the inner peak of the toothed portion. A method of manufacturing a member having a grooved tooth portion for a snap ring, characterized in that the tooth portion and the groove for a snap ring are press-formed at the same time. (2) The manufacturing method according to claim 1, wherein one side of the snap ring groove is formed by shearing and the other side is formed by bending. (3) In the inner mountain portion of the tooth portion, the tooth portion located on the outside of the snap ring groove is formed to have a narrower cross-sectional shape than the tooth portion located on the inside. The manufacturing method according to item 1 or 2. (4) On the outward flange formed on one end of the sheet metal cylindrical drum, teeth with a substantially trapezoidal cross-sectional shape and snap ring grooves located on the inner peaks of each tooth are simultaneously press-formed. The apparatus includes an upper die for forming the tooth portion and a lower die, and a middle die for forming the snap ring groove between these dies, and for pressing the flange. 1. A manufacturing device for a member having a grooved tooth portion for a snap ring, characterized in that a plurality of punches are arranged. (5) The tooth valley shape on the outer periphery of the lower die is formed to be smaller or equal to the tooth valley shape on the outer periphery of the upper die, and larger than the tooth ridge shape on the outer periphery of the middle die, and the middle die 5. The manufacturing apparatus according to claim 4, wherein after the tooth portion is formed, it is formed to rotate around the axis by a half pitch.