KR101296330B1 - Manufacturing Method of Planet Carrier for Auto Transmission - Google Patents

Abstract

The present invention relates to a method for manufacturing a planetary carrier for an automatic transmission, and according to the present invention, by forming a powder metallurgy, each part of a plate, a first spider, and a second spider, which are planetary carrier parts for an automatic transmission, is formed and these parts are once By simultaneously joining copper in the process of sintering, it is possible to simplify the manufacturing process and lower the production cost of the product. Furthermore, according to the present invention, the sintering and joining of each part is performed without laser welding, so that the physical properties of the joining site are not changed. Bonding and stiffness is improved, and copper is infiltrated at the same time as joining, so that the structure of the part is dense and the rigidity is increased, thereby improving the durability of the part.

Description

Manufacturing Method of Planetary Carrier for Auto Transmission

The present invention relates to a method of manufacturing a planetary carrier for an automatic transmission, and more particularly, to form each part of the planetary carrier for an automatic transmission by a powder metallurgy method and to simultaneously invade and join these parts by copper in one step. The present invention relates to a method for manufacturing a planetary carrier for an automatic transmission, which simplifies the manufacturing process, lowers the production cost of the product, improves bonding and rigidity without changing the physical properties of the joint, and increases the structure of the parts. .

In general, a planetary gear set as a transmission of an automatic transmission is a device for assisting the knock converting capability of a torque converter and performing reverse operation. The planetary gear is automatically operated by a predetermined hydraulic control device according to the driving state of the vehicle. A plurality of planetary pinions are supported and bitten by a planetary carrier, and a ring gear is engaged with the outer circumference thereof.

1 is an exploded perspective view showing a planetary carrier for an automatic transmission according to the prior art, as shown in the planet carrier support and protect the side bearing and planetary pinion, the sun gear mounting hole 113 so that the sun gear (not shown) is disposed in the center ) And a base plate 110 having a plurality of first pinion mounting holes 115 drilled at predetermined intervals around the sun gear mounting hole 113 and a planetary pinion 130 on the base plate 110. The cover plate 120 is provided with a mounting space therebetween, the second pinion mounting hole 125 is drilled to be symmetrical to the first pinion mounting hole 115, and the base plate 110 or the cover plate 120. Is formed integrally with any one of the support portion 117 to support the gap between the base plate 110 and the cover plate 120.

In addition, the planetary pinion 130 protrudes to both sides at the center thereof, and the pinion shaft 135 coupled to the first and second pinion mounting holes 115 and 125 is coupled and fixed.

That is, the pinion shafts 135 protruding on both sides of the planetary pinion 130 are coupled to the first and second pinion mounting holes 115 and 125 to mount the planetary pinion 130 to the planet carrier 100. It is to let.

By the way, in the prior art planetary carrier for automatic transmission, since both the base plate and the cover plate, which are the component parts, are separately manufactured by the press forging method and then joined by laser welding, the manufacturing process is not only complicated, but also the product. There was a problem that the manufacturing cost of the rise.

In addition, due to the laser welding between the parts, the physical properties of the bonded portion is changed and the rigidity is reduced, and the brittleness is partially increased, and when mounted on an automatic transmission requiring high durability, the fatal problem of low stability due to breakage or deformation is reduced. there was.

In addition, due to the deformation and brittleness of the laser joint, the durability of the automatic transmission decreases compared to other parts of the automatic transmission, thereby increasing the cost of expensive automatic transmission maintenance and repair, thereby reducing the overall economic efficiency of the automatic transmission.

Therefore, in the past, the planetary carrier was manufactured by applying a press forging method. However, in addition to the above-mentioned problems, durability problems are caused due to material limitations that are difficult to deform and heat treatment. It is a trend.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned background, and an object of the present invention is to form a planetary carrier component for an automatic transmission by powder metallurgy and simultaneously join these parts by copper infiltration in one step to simplify the manufacturing process and produce a product. It is in lowering the cost.

In addition, the object of the present invention is to eliminate the bonding between the parts of the planetary carrier for automatic transmission by laser welding, thereby increasing the bonding properties and rigidity without changing the physical properties of the joint portion, and the structure of the parts to be dense and increase the rigidity of the parts An object of the present invention is to provide a method of manufacturing a planetary carrier for an automatic transmission that can improve durability.

The object of the present invention relates to a method of manufacturing a planetary carrier for an automatic transmission in which a plate, a first spider and a second spider are laminated and bonded at a predetermined interval, wherein each of the plate, the first spider and the second spider is formed of powder metal. The first step, and sequentially stacking the plate, the first spider and the second spider, the brazing slug is inserted between the plate and the first spider, and between the first spider and the second spider, And a second step of placing copper slugs on the upper side of the plate and the upper side of the first spider, placing them in a sintering furnace, heating, copper infiltrating, and joining them. Is achieved.

Here, the second step may include a sinter hardening step of copper immersion in the sintering furnace and heat treatment with a cooling fan after bonding.

In addition, a third step of tempering heat treatment for 1 to 2 hours at 150 ~ 190 ℃ after the sintering curing step.

In addition, in the first step, the plate is 0.7 to 1.0% by weight of carbon, 0.6 to 1.0% by weight of molybdenum, and the remaining amount after compression molding a powder metal containing iron to a density of 6.8 to 7.2 g / cm 2 to 1120 to Sintering is formed by heating at a temperature of 1150 ° C. for 30-40 minutes.

In addition, in the first step, the first spider and the second spider compress 0.7 to 1.0% by weight of carbon, 2.0 to 4.0% by weight of copper, and powder metal containing iron in the remaining amount to a density of 6.8 to 7.2 g / cm 2. After molding, it is sintered by heating at a temperature of 1120 ~ 1150 ℃ for 30 to 40 minutes.

Further, in the first step, at least one incision groove is formed in the outer tooth side of the plate, and in the second step, a brazing slug is inserted between the upper side of the support of the first spider and the plate through the incision groove. And sintered by heating.

Further, in the first step, at least one groove is formed on the lower side of the first spider in contact with the support of the second spider, and in the second step, the brazing slug is inserted into the groove and heated and sintered.

In addition, the brazing slug comprises 40 to 44% by weight of nickel, 38 to 42% by weight of copper, 14 to 17% by weight of manganese, 1.3 to 1.7% by weight of boron, 1.6 to 2.0% by weight of silicon, the cylinder Or in the form of an elliptical column ingot form is inserted.

In addition, the copper slug placed on the disc of the plate is formed to a weight of 8 to 12% of the weight of the plate.

In addition, the copper slug placed on the disc of the first spider is formed to a weight of 8 to 10% of the weight of the first spider.

In addition, the plates, the first spider and the second spider, which are sequentially stacked and stacked, are sintered and joined in a sintering furnace while being mounted on a plate formed of mullite.

According to the present invention, the powder metallurgy method forms a plate, a first spider, and a second spider, which are planetary carrier parts for an automatic transmission, and the parts can be simultaneously joined while copper infiltrating in one step. This simplifies and significantly lowers the production cost of the product.

In addition, according to the present invention, by sintering and joining each other without laser welding between the parts, the physical properties of the joints are not changed, and the bonding properties and rigidity are improved. After sintering, it is quenched with a cooling fan and sintered and hardened, thereby improving the rigidity of the component and improving the durability of the component.

1 is an exploded perspective view showing a planetary carrier for an automatic transmission according to the prior art;
2 is a flow chart showing a manufacturing method of the planetary carrier for an automatic transmission according to the present invention;
Figure 3 is a perspective view showing a combined state of the planetary carrier for automatic transmission prepared by the present invention,
FIG. 4 is an exploded perspective view of FIG. 3,
5 is an exploded perspective view showing a copper infiltration method of a plate which is a component of the planetary carrier for an automatic transmission according to the present invention;
6 is an exploded perspective view showing the copper infiltration method of the first spider which is a component of the planetary carrier for automatic transmission according to the present invention;
Figure 7 is a photograph showing a copper infiltrated tissue state of the planetary carrier for automatic transmission according to the present invention,
8 is a partial cross-sectional view showing a sintered joint structure of a first spider which is a component of the planetary carrier for an automatic transmission according to the present invention;
9 is a cross-sectional view showing a sintered joint structure of the first spider and the second spider which are components of the planetary carrier for an automatic transmission according to the present invention;
10 is a perspective view showing a bonding state immediately before the planetary carrier for an automatic transmission according to the present invention is put into a sintering furnace and sintered bonding, copper infiltration and sinter hardening.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

Figure 2 is a flow chart showing a manufacturing method of the planetary carrier for automatic transmission according to the present invention, Figure 3 is a perspective view showing a combined state of the planetary carrier for automatic transmission prepared by the present invention, Figure 4 is an exploded perspective view of Figure 3, 5 is an exploded perspective view showing a copper infiltration method of a plate which is a component of the planetary carrier for automatic transmission according to the present invention, and FIG. 6 is an exploded view showing a copper infiltration method of a first spider which is a component of the planetary carrier for automatic transmission according to the present invention. 7 is a photograph showing a state in which the planetary carrier for automatic transmission is infiltrated with copper, and FIG. 8 is a partial cross-sectional view showing a sintered joint structure of a first spider which is a component of the planetary carrier for automatic transmission according to the present invention. 9 is a cross-sectional view showing a sintered joint structure of a first spider and a second spider which are components of a planetary carrier for an automatic transmission according to the present invention; 10 is a perspective view showing a bonding state immediately before the planetary carrier for an automatic transmission according to the present invention is put into a sintering furnace, followed by sinter bonding, copper infiltration and sinter hardening.

As shown in these drawings, the method of manufacturing a planetary carrier for an automatic transmission according to the present invention includes an automatic transmission in which a plate 310, a first spider 320, and a second spider 330 are laminated and bonded at predetermined intervals. A method of manufacturing a solvent-based oil carrier, the first step (S210) and compression of each of the plate 310, the first spider 320 and the second spider 330 with powder metal, and the plate 310 The first spider 320 and the second spider 330 are sequentially stacked and arranged between the plate 310 and the first spider 320, and between the first spider 320 and the second spider 330. Insert the brazing slug 515 in between, and put the copper slugs (510, 610) on the upper side of the plate 310 and the upper side of the first spider 320 put them in a sintering furnace and heated to copper Including a second step (S220) to infiltrate and combine The features.

In the present invention, the automatic transmission is a device that automates the clutch operation and gear operation during the driving operation, the planet carrier 300 is a core component of the automatic transmission plate 310, the first spider 320, the second spider ( 330).

The planet carrier 300 generally has to go through a complicated process of manufacturing each part by a press forging method and combining them by laser welding. However, in the present invention, sintering is performed, but each part is joined in only one process, and at the same time, copper At the same time, the sintering and hardening are performed to increase the rigidity and durability.

That is, the plate 310, the first spider 320, the second spider 330 each component sinter brazing (Sinter brazing), copper infiltration (Cu Infiltration), sinter hardening (sinter hardening) to separate welding work, etc. Bonding without the need to increase the rigidity.

Powder metallurgy method refers to a manufacturing method in which a metal powder is put into a mold and compression molded into a powder molding press, followed by heat sintering at a temperature below the melting point to produce a product. The advantages of the metallurgy method are as follows. Has

Compared to the forging method, many machining can be omitted because of the high degree of precision, and there is no need to raise the temperature to the melting point in the manufacturing process, and it is easy to design an alloy that can not be made by the melting method.

In addition, it is possible to make porous metal materials, have self-lubricating properties, uniform shape and dimensions in a set of molds, and obtain a good surface condition. In iron powder metallurgy parts, surface hardening, heat treatment, steam It can be processed, responds quickly to mass production changes, and is economical for mass production.

In the present invention, first, each part of the plate 310, the first spider 320, and the second spider 330 is compression-molded with powder metal through the first step S210, and the plate 310 has a hole in the center thereof. 312 is formed and a plurality of holes 315 to which the shaft of the planetary pinion is coupled at a position spaced apart from the predetermined distance in the radial direction, and is engaged with a ring gear (not shown) on the outer peripheral side of the circumferential surface Teeth 313 are provided.

In addition, the outer peripheral side teeth 313 of the plate 310 is provided with a cutting groove 317 into which the brazing slug 515 is inserted to enable sintering bonding with the first spider 320, and the cutting groove 317 is provided. At least one is formed at a position in contact with the support of the first spider 320 so that the sintered bonding of the silver plate 310 and the first spider 320 is firm.

In addition, a ring-shaped copper slug 510 has a disc 311 and a tooth 313 on the disc 311 of the plate 310 so that copper infiltration is uniformly performed at the same time during the sintering bonding of the second step S220. The ring-shaped copper slug 510 which is placed on the stepped portion of the wire 310 is thus formed to have a weight of 8 to 15% of the weight of the plate 310.

Therefore, during sintering bonding, the pores in the plate 310, which is the sintered base material, are filled with copper at the same time, thereby densifying the structure after sintering of the plate 310, quenching and sintering and hardening the physical properties of the plate 310. Can be improved.

Therefore, as shown in FIG. 7, the copper is filled between the pores of the sintered article, thereby making the structure dense and increasing the rigidity.

The plate 310 compresses a powder metal containing 0.7 to 1.0% by weight of carbon (C), 0.6 to 1.0% by weight of molybdenum (Mo), and iron (Fe) as a balance to a density of 6.8 to 7.2 g / cm 2. After molding, it is sintered by heating at a temperature of 1120 ~ 1150 ℃ for 30 to 40 minutes.

In the powder metal forming the plate 310, carbon (C) is included in an amount of 0.7 to 1.0% by weight, based on the total weight of the powder metal, in an amount of 0.7 to 1.0% by weight, and the carrier component when included in less than 0.7% by weight. Problems such as a decrease in strength and hardness of the plate 310 itself may occur. On the contrary, when it exceeds 1.0% by weight, the hardness of the plate 310 is high, which makes processing difficult. Deterioration of mechanical properties, such as brittleness may occur.

Molybdenum (Mo) in the powder metal forming the plate 310 is included in the amount of 0.6 to 1.0% by weight, based on the total weight of the powder metal in an amount of 0.6 to 1.0% by weight, if less than 0.6% by weight sintering formation After the lowering of the cooling function, the problem of low hardness and strength may be lowered. On the contrary, when it exceeds 1.0% by weight, the physical properties of the product may be improved, but the width thereof may be insignificant, resulting in economical efficiency of material cost and production cost. A problem may occur that falls.

In addition, when the sintering temperature of the plate 310 is formed when the sintering temperature is less than 1120 ℃ or the sintering time is less than 30 minutes, the sintering is not made sufficiently may cause a problem that the inter-particle bonding is weak, On the contrary, when the sintering temperature exceeds 1150 ℃ or the sintering time exceeds 40 minutes, problems such as a decrease in tool life during processing may occur due to excessive densification of the structure.

On the other hand, the first spider 320 is provided with a plurality of support parts 323 on the radially outer portion of the disc 321 so that the plate 310 can be laminated and coupled to the plate 310 at a predetermined interval, the sun gear (not shown) in the center A hole 322 is formed in a shape corresponding to the central hole 312 of the plate 310 so that the plate 310 is mounted, and there are several holes 325 to which the shaft of the planetary pinion is coupled at a position spaced apart by a predetermined distance in the radial direction. ) Is formed.

In addition, the disc 321 of the first spider 320 may be provided with a stepped hole 327 into which the copper slug 610 is inserted to uniformly infiltrate copper at the same time when sintering and joining, such a stepped hole 327 ) May be provided radially between the hole 322 and the support 323 of the central portion.

The stepped hole 327 is a copper slug 610 in the ingot state of the cylinder or elliptical column in order to fix the position of the copper slug 610 when the planetary carrier 300 enters the sintering furnace Two holes of different diameters are formed stepped to be fitted.

Here, the copper slug 610 placed on the upper surface of the first spider 320 or the stepped hole 327 is formed with a weight of 8 to 15% of the weight of the first spider 320.

Accordingly, the first spider 320 may be deformed and cured by filling the pores in the first spider 320 and the second spider 330, which are the sintering base materials, with copper during copper sintering at the same time. And physical properties of the second spider 330 can be improved.

The second spider 330 is provided with several supporting parts 333 on the outer portion of the disc, such as the first spider 320 so that the second spider 330 can be stacked and coupled with the first spider 320 at a predetermined interval, and the sun gear ( A hole 332 is formed in a shape corresponding to the central hole 322 of the first spider 320 so that the shaft of the planetary pinion is coupled to a position spaced apart by a predetermined distance in the radial direction. Several holes 335 are formed.

The first spider 320 and the second spider 330 is 0.7 to 1.0% by weight of carbon (C), 2.0 to 4.0% by weight of copper (Cu), the remaining amount of powder metal containing iron (Fe) 6.8 After compression molding to a density of ˜7.2 g / cm 2, sintering is formed by heating at a temperature of 1120 to 1150 ° C. for 30 to 40 minutes.

In the powder metal forming the first spider 320 and the second spider 330, carbon (C) is a weight% calculated based on the total weight of the powder metal and is included in an amount of 0.7 to 1.0 weight%, and 0.7 weight If less than%, the first spider 320 and the second spider 330 itself may cause problems such as the strength or hardness of the lowering, on the contrary, if it exceeds 1.0% by weight plate 310 It may cause a problem that the mechanical properties such as high hardness of the brittleness is lowered.

In the powder metal forming the first spider 320 and the second spider 330, copper (Cu) is included in an amount of 2.0 to 4.0 wt% based on the total weight of the powder metal. If the amount is less than 2.0% by weight, the amount of liquid sintering decreases, so that the structure may not be compacted during sintering, which may cause problems such as a decrease in strength.On the contrary, when the amount exceeds 4.0% by weight, the amount of liquid sintering increases, making it difficult to manage the process. This may occur.

In addition, when the sintering temperature of the first spider 320 and the second spider 330 is less than 1120 ° C. or the sintering time is less than 30 minutes, the sintering may not be sufficiently performed, and thus, the interparticle bonding is weak. On the contrary, when the sintering temperature exceeds 1150 ° C or the sintering time exceeds 40 minutes, problems such as reduced tool life during dimensional precision control and processing due to excessive densification of the structure may occur. Can be.

A recess in which the brazing slug 515 is inserted into the lower surface of the disc 321 of the first spider 320 in contact with the support part 333 of the second spider 330 to enable sintering as shown in FIGS. 8 and 9. 324 is provided, the groove 324 is at least one in contact with the support portion 333 of the second spider 330 so that the sintered bonding of the first spider 320 and the second spider 330 is secured More than one are formed.

On the other hand, the brazing slug 515 for sintering the plate 310 and the first spider 320, the first spider 320 and the second spider 330 is 40 to 44% by weight of nickel (Ni), 38 ~ 42 wt% copper (Cu), 14-17 wt% manganese (Mn), 1.3-1.7 wt% boron (B), 1.6-2.0 wt% silicon (Si), cylindrical or ellipsoidal It is formed in the ingot of the state as shown in Figure 10 is inserted into the cutting groove 317 of the plate 310 and the groove 324 of the first spider 320 enters the sintering furnace.

In addition, the plates 310, the first spider 320, and the second spider 330 sequentially stacked in this manner enter the sintering furnace while being mounted on the plate 620 formed of mullite for fire resistance and solvent resistance. Sintered and bonded.

Subsequently, when heated in the sintering furnace, the brazing slug 515 is melted to infiltrate between the plate 310 and the first spider 320 and between the first spider 320 and the second spider 330 to join them. At the same time, the copper slugs 510 and 610 are melted to infiltrate the pores of the respective parts.

The second step (S220) may include a sinter hardening step in which copper is immersed in the sintering furnace and bonded and then heat treated with a cooling fan, and after the sinter hardening step, temper heat treatment at 150 to 190 ° C. for 1 to 2 hours. Step S230 may be included.

According to the present invention, the powder metallurgy method is to form the plate, the first spider, the second spider parts, which are carrier parts for the automatic transmission planetary gear, and the parts can be simultaneously bonded while copper infiltrating in one process. This simplifies the process and lowers the production cost of the product.

In addition, according to the present invention, by sintering and joining each component without laser welding, the physical properties of the joints are not changed, and the bonding properties and rigidity are improved. There is an effect of improving the durability.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

310: plate 311: disc of the plate
313: tooth 317: incision groove
320: first spider 321: the first spider
323: support of the first spider
324: groove 327: step hole
330: The Second Spider 331: The Second Spider
333: support of the second spider
510, 610: copper slug
515: brazing slug

Claims (11)

A method of manufacturing a planetary carrier for an automatic transmission, in which a plate, a first spider and a second spider are laminated and bonded at a predetermined interval,
A first step of compression molding each of the plate, the first spider and the second spider with powder metal; And
Lay out and arrange the plate, the first spider and the second spider sequentially, and insert a brazing slug between the plate and the first spider, and between the first spider and the second spider, the upper surface of the plate and the A second step of placing the copper slug on the upper side of the first spider and placing them in a sintering furnace to heat copper infiltrate and join;
In the first step, at least one incision groove is formed in the outer tooth side of the plate, and in the second step, the brazing slug is inserted between the upper side of the support part of the first spider and the plate through the incision groove and heated. Method for producing a planetary carrier for an automatic transmission, characterized in that the sintering bonding. The method of claim 1,
In the first step, the plate is 0.7 to 1.0% by weight of carbon, 0.6 to 1.0% by weight of molybdenum, and the remaining amount after compression molding a powder metal containing iron to a density of 6.8 to 7.2 g / ㎠ 1120 ~ 1150 ℃ Method of producing a planetary carrier for an automatic transmission, characterized in that the sintering is formed by heating at a temperature of 30 to 40 minutes. The method of claim 1,
In the first step, the first spider and the second spider are 0.7 to 1.0% by weight of carbon, 2.0 to 4.0% by weight of copper, and a compression molding of a powder metal containing iron with a residual amount of 6.8 to 7.2 g / cm 2. After the heating is carried out for 30 to 40 minutes at a temperature of 1120 ~ 1150 ℃ sintered manufacturing method of the planetary carrier for automatic transmission, characterized in that formed. The method of claim 1,
The second step is a method of manufacturing a planetary carrier for an automatic transmission, characterized in that the copper is immersed in the sintering furnace and bonded to the sinter hardening step of heat treatment with a cooling fan. The method of claim 4, wherein
And a third step of tempering heat treatment at 150 to 190 ° C. for 1 to 2 hours after the sintering hardening step. delete The method of claim 1,
Forming at least one groove in the lower side of the first spider in contact with the support of the second spider in the first step, and inserting the brazing slug into the groove in the second step and sintered by bonding The manufacturing method of the planetary carrier for automatic transmission. 8. The method of claim 1 or 7,
The brazing slug comprises 40 to 44 weight percent nickel, 38 to 42 weight percent copper, 14 to 17 weight percent manganese, 1.3 to 1.7 weight percent boron, 1.6 to 2.0 weight percent silicon, and is a cylinder or ellipse Formed in a column-shaped ingot form manufacturing method of the planetary carrier for automatic transmission, characterized in that inserted. The method of claim 1,
Copper slug put on the disc of the plate is a manufacturing method of the planetary carrier for automatic transmission, characterized in that formed by the weight of 8 to 15% of the weight of the plate. The method of claim 1,
Copper slug put on the disc of the first spider is a manufacturing method of the planetary carrier for automatic transmission, characterized in that formed in a weight of 8 to 15% of the weight of the first spider. The method of claim 1,
And the plate, the first spider and the second spider, which are sequentially stacked and stacked, enter the sintering furnace and are sintered and joined together on a plate formed of mullite.

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