JPH0985430A - Production of brazed parts and parts formed by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for production which prevents the occurrence of soldering defects, reduces a cost and does not require excess man-hours at the time of producing brazed parts by assembling plural members to each other and joining these members by brazing and the brazed parts formed by using this process. SOLUTION: Brazing filler metals 5 are arranged between the members (clutch cone 2 and helical gear 3) to be assembled to each other and at least either of these members are so partly and plastically deformed as to be regulated in the relative displacement with the other member and thereafter, the assembled members are joined to each other by brazing in the process for producing the brazed parts by assembling the plural members to each other and joining the members by brazing. The brazing is executed simultaneously with carburization hardening of the parts (transmission gear 1).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a brazed component in which a plurality of members are assembled with each other and joined by brazing, and a component manufactured using such a manufacturing method.

[0002]

2. Description of the Related Art A brazing method is generally well known as a method of assembling a plurality of members with each other and joining them to manufacture a component. When the members to be assembled together are relatively large, mechanical fixing methods such as fastening with bolts or pinning, or welding methods such as gas welding or arc welding are generally used. The brazing method is widely used for joining members having a relatively small size.

For example, when manufacturing a gear component (mission gear) to be incorporated in a transmission of a vehicle such as an automobile, a gear for synchronization (synchronization) is used for the purpose of achieving both small size and weight and ensuring machinability. The clutch cone and the helical gear may be separately manufactured to have a two-part structure. Then, when the clutch cone and the helical gear are respectively manufactured by machining or the like, and then the both are assembled and joined, electron beam welding is conventionally generally used. However, in the case of this electron beam welding method, although it is possible to perform welding of small items with relatively high precision, it is difficult to maintain stable welding conditions such as setting the degree of vacuum and the like, and the cost is high. For this reason,
Applying brazing to the connection between the clutch cone and the helical gear has been considered.

By the way, the above-mentioned transmission gear needs to be subjected to quenching treatment in order to secure required strength and wear resistance. Incidentally, in this quenching treatment, as in the case of a general gear part, in order to maintain the toughness of the inside by hardening only the surface portion and its vicinity where abrasion resistance is required, for example, carburizing A surface hardening treatment such as putting is applied. Therefore, it is considered that the brazing for joining the clutch cone and the helical gear is performed by utilizing the heat change (that is, the heating and the subsequent cooling) of the quenching treatment. That is, the brazing material is melted in the heating step during the quenching treatment and then solidified in the cooling step. By adopting such a method, brazing is performed at the same time as the quenching treatment (in the same treatment step). It is possible,
A significant reduction in manufacturing cost can be realized. still,
Although not particularly intended to be applied to a transmission gear having a two-part structure, for example, JP-A-3-248795.
The publication discloses a method of joining and quenching a shaft and a gear in which joining (brazing) of the gear and its shaft is performed in the same treatment step as quenching.

[0005]

However, regarding the relationship between the melting point of the brazing filler metal and the heating temperature during the quenching treatment, when the melting point of the brazing filler metal (that is, the solidus line) is lower than the above heating temperature, There is a problem that defective brazing may occur due to thermal deformation of both members during cooling (quick cooling). That is,
Taking the case of the above-mentioned mission gear as an example, the heating temperature at the time of carburizing and quenching is set to a carburizing temperature of 930 ° C. and a quenching heating temperature of 850 ° C., for example, as shown in the heat treatment chart of FIG. However, the melting point of the brazing filler metal is generally lower than the above-mentioned quenching heating temperature (850 ° C.) in the case of commercially available ones, and the consumers themselves have to some extent devise their own. Even with the addition of, the temperature is usually up to about 780 ° C.

On the other hand, as shown in FIGS. 13 and 14,
The transmission gear 51 is assembled by mounting the hole 5 of the clutch cone 52 on the outer peripheral portion 53a of the boss portion 53B of the helical gear 53.
The inner peripheral portion 52i of 2H is fitted and press-fitted. At this time, the brazing material 55 is placed between the two parts 52 and 53,
Specifically, it is arranged in advance in the base region of the boss portion 53B of the helical gear 53 (see FIG. 13). Then, the clutch cone 52 is pressed from above in the drawing with a predetermined load F ′ via the press pressing tool 54, and the end surface 52f (lower end surface in the drawing) of the clutch cone 52 is the stopper surface 53 of the helical gear 53.
Press it into contact with f. At this time, the gap between the lower end surface 52f of the clutch cone 52 and the stopper surface 53f of the helical gear 53 is 0 (zero) in a macro,
Actually, there is a microscopic gap of about 20 to 40 μm due to the surface roughness of the both surfaces 52f and 53f.

The mission gear 5 assembled in this way
1 is then placed in a heat treatment furnace for carburizing and quenching and heated. That is, the mission gear 51 is heated to 930 ° C. in the carburizing process, and at this time, the brazing material 55 is melted. After that, the quenching heating temperature of 850 ° C. is maintained, but at this temperature, the brazing material 55 is in a semi-molten state without solidifying. And by being put in the salt bath,
The clutch cone 52 and the helical gear 53 are each rapidly quenched to 230 ° C. At this time, the clutch cone 52 and the helical gear 53 are individually quenched and deformed due to a large temperature change caused by the rapid cooling, and the clutch cone 52 tends to float up from the helical gear 53. . Also, at this time, both members 5 are pressed into each other.
A force acts in a direction to release the residual stress generated in the inside of 2, 53, and this force also acts so that the clutch cone 53 tends to float up with respect to the helical gear 53.

As a result, the lower end surface 5 of the clutch cone 52 is
The gap between 2f and the stopper surface 53f of the helical gear 53 becomes large, and the measured value is about 80 to 100 μm.
That is, when the brazing filler metal 55 located between the lower end face 52f of the clutch cone 52 and the stopper face 53f of the helical gear 53 is subjected to a large thermal stress in a semi-molten state where it is not sufficiently solidified, it may break. Can occur.
When such a situation occurs, the clutch cone 52 and the helical gear 53 are joined to each other by the fitting surfaces 52i, 53 of the two 52, 53.
Only the brazing material 55 located at a will bear the load, and its strength will be extremely insufficient.

To solve the above problem, a brazing material having a high melting point,
That is, the melting point is the quenching heating temperature (8 in the above example).
It is conceivable to use a brazing filler metal higher than 50 ° C.
That is, when such a brazing filler metal is used, the brazing filler metal is already solidified in the quenching and heating state, and during the subsequent rapid cooling, both members are thermally deformed as described above, and the thermal stress caused by this is generated. The brazing filler metal can sufficiently withstand the stress even when the action is performed. That is, it is possible to effectively prevent a brazing defect such as partial breakage of the brazing material.

However, in the case of the above-mentioned brazing filler metal having a high melting point, it contains an additive element such as Mn (manganese) which is not contained in the commercially available brazing filler metal so much. It is necessary to coat from the ambient atmosphere by applying fluffs to prevent oxidation. That is, when a brazing material having a high melting point is used, there is a problem that extra man-hours are required to apply the fluffs for preventing oxidation.

The present invention has been made in view of the above problems, and when manufacturing a brazed component in which a plurality of members are assembled with each other and joined by brazing, the occurrence of defective brazing can be prevented, and a low level of brazing can be achieved. An object of the present invention is to provide a manufacturing method that does not require extra man-hours at cost and a brazed component using the manufacturing method.

[0012]

Therefore, the invention according to claim 1 of the present application (hereinafter referred to as the first invention) is a method of manufacturing a brazed component in which a plurality of members are assembled with each other and joined by brazing. After disposing a brazing filler metal between the members to be assembled to each other and partially plastically deforming at least one of these members so that the relative displacement with the other member is restricted. The assembled members are joined together by brazing.

Further, the invention according to claim 2 of the present application (hereinafter referred to as “the invention”)
The second invention) is characterized in that, in the first invention, at least one of the members is partially plastically deformed while being assembled to the other member.

Further, the invention according to claim 3 of the present application (hereinafter referred to as “the invention”)
(Third invention) is characterized in that, in the first or second invention, the members are assembled together by press fitting.

[0015] Further, the invention according to claim 4 of the present application.
(Hereinafter, referred to as a fourth invention) is characterized in that, in any one of the above-mentioned first to third inventions, the brazing component is subjected to a quenching treatment.

The invention according to claim 5 of the present application
(Hereinafter, referred to as a fifth invention) is the same as the fourth invention, in which the brazing material is melted in a heating step at the time of quenching treatment and then solidified in a cooling step at the same time as the quenching treatment. It is characterized by brazing.

Furthermore, the invention according to claim 6 of the present application.
(Hereinafter, referred to as a sixth invention) is characterized in that, in the fourth or fifth invention, the quenching treatment is carburizing quenching.

Furthermore, the invention according to claim 7 of the present application.
(Hereinafter, referred to as a seventh invention) is characterized in that, in any one of the first to sixth inventions, the member is a gear body and a shaft member that supports a rotational operation of the gear body. It is a thing.

Furthermore, the invention according to claim 8 of the present application.
(Hereinafter, referred to as an eighth invention) is, in the above-mentioned seventh invention, an inner circumference of a hole portion for fitting the gear body and the shaft member so that relative displacement between them is restricted. It is characterized by partially plastically deforming the vicinity of the part.

The invention according to claim 9 of the present application (hereinafter,
A ninth invention) is a brazing component in which a plurality of members are assembled with each other and integrally joined by brazing, and a brazing material is arranged between the members to be assembled with each other. At least one of the members is characterized by being partially plastically deformed so that the relative displacement with the other member is restricted, and then the assembled members are joined by brazing. is there.

Further, an invention according to claim 10 of the present application (hereinafter referred to as a tenth invention) is characterized in that, in the ninth invention, the members are assembled together by press fitting.

Furthermore, the invention according to claim 11 of the present application.
(Hereinafter, referred to as 11th invention) is the above 9th or 10th invention.
In the invention described above, the brazing component is characterized by being quenched.

Furthermore, the invention according to claim 12 of the present application.
(Hereinafter, referred to as twelfth invention) is characterized in that, in the eleventh invention, the quenching treatment is carburizing quenching.

The invention according to claim 13 of the present application
(Hereinafter, referred to as a thirteenth invention) is characterized in that, in any one of the ninth to twelfth inventions, the member is a gear main body and a shaft member that supports a rotational operation of the gear main body. It is a thing.

Further, the invention according to claim 14 of the present application
(Hereinafter, referred to as a fourteenth invention) is, in the thirteenth invention, an inner circumference of a hole for fitting the gear body and the shaft member so that relative displacement between the gear body and the shaft member is restricted. It is characterized by partially plastically deforming the vicinity of the part.

[0026]

According to the first aspect of the present invention,
The brazing filler metal is arranged between the members to be assembled with each other, and at least one of these members is partially plastically deformed so that the relative displacement with the other member is restricted. Thus, both members are integrated (so-called, temporarily fixed). Therefore, in the brazing to be performed after this, the melting point (solidus line) of the brazing filler metal may be lower than the heating temperature during brazing, even if the brazing filler metal is subjected to the stress caused by thermal deformation due to heating and cooling. Even if the members are subjected to the action of thermal stress or the like in a state where the material is not sufficiently solidified, the two members are not displaced relative to each other, and it is possible to reliably prevent the occurrence of defective joining in the brazed portion. That is, it is possible to prevent the occurrence of defective brazing at a lower cost than in the case of using the electron beam welding method, and without requiring extra man-hours as in the case of using a brazing material having a high melting point.

According to the second aspect of the present invention, basically, the same effects as those of the first aspect can be obtained. Moreover, since the above-mentioned partial plastic deformation is performed while the members are assembled together, it is not necessary to provide a separate process, and the relative displacement between the two members is restricted without affecting production efficiency. It is possible to prevent the occurrence of defective joints during attachment.

Further, according to the third invention of the present application, basically, the same effect as that of the first or second invention can be obtained. In particular, since the above members are assembled together by press fitting, even if the force that releases the residual stress generated in the member during press fitting acts due to the thermal deformation due to heating / cooling during brazing, the force exerts both The members are not displaced relative to each other, and it is possible to prevent defective joining during brazing.

Further, according to the fourth invention of the present application,
Basically, the same effect as any one of the first to third inventions can be obtained. In particular, since the above-mentioned brazed parts are hardened, even if the brazing material is subjected to the effects of stress due to thermal deformation due to heating / cooling during the hardening treatment, in particular, the melting point (solidus line) of the brazing material ) Is lower than the heating temperature during the quenching process and the brazing filler metal is in a semi-molten state and is subjected to the action of thermal stress or the like, the two members will not be displaced relative to each other, and a joint failure will occur in the brazing part. It can be surely prevented.

Further, according to the fifth invention of the present application,
Basically, the same effect as the fourth invention can be obtained. Moreover, since the brazing material is melted in the heating step during the quenching treatment and then solidified in the cooling step, brazing is performed at the same time as the quenching treatment. The productivity can be significantly increased as compared with the case where and are performed separately.

Further, according to the sixth invention of the present application,
Basically, the same effects as those of the fourth or fifth invention can be obtained. In particular, since the above-mentioned quenching treatment is carburizing and quenching, a brazed component is produced which is carburized and quenched while hardening only the surface portion and its vicinity where abrasion resistance etc. are required and maintaining the internal toughness. At this time, it is possible to reliably prevent the occurrence of defective joints in the brazed portion at low cost and without extra man-hours, and to improve productivity by simultaneously performing heat treatment and brazing. .

Further, according to the seventh invention of the present application,
Basically, the same effect as any one of the first to sixth inventions can be obtained. In particular, since the above-mentioned member is a gear body and a shaft member that supports the rotational movement of the gear body, a low cost and extra man-hours are required when manufacturing a gear component having a two-part structure by brazing. Without fail, it is possible to reliably prevent the occurrence of a defective joint in the brazed portion, and it is possible to improve productivity by simultaneously performing heat treatment and brazing.

Further, according to the eighth invention of the present application,
Basically, the same effect as the seventh aspect of the invention can be obtained. In particular, in order to restrict the relative displacement between the gear body and the shaft member, the vicinity of the inner peripheral portion of the hole for fitting the gear body and the shaft member is partially plastically deformed. Of the brazing filler metal (so-called temporary fixing), and even if the brazing filler metal has a melting point (solidus line) during brazing even if it is subjected to the stress caused by thermal deformation due to heating and cooling during brazing. Even if the brazing filler metal is lower than the heating temperature and is not sufficiently solidified, the two members will not be displaced relative to each other even when subjected to the action of thermal stress, etc., and it is possible to reliably prevent defective joints in the brazing part. it can.

In the brazing component according to the ninth invention of the present application, a brazing material is arranged between members to be assembled with each other, and at least one of these members is subjected to relative displacement with the other member. Therefore, both members are integrated (so-called temporary fixing). Therefore, in the brazing to be performed after this, the melting point (solidus line) of the brazing filler metal may be lower than the heating temperature during brazing, even if the brazing filler metal is subjected to the stress caused by thermal deformation due to heating and cooling. Even if the members are subjected to the action of thermal stress or the like in a state where the material is not sufficiently solidified, the two members are not displaced relative to each other, and it is possible to reliably prevent the occurrence of defective joining in the brazed portion. That is, it is possible to prevent the occurrence of defective brazing at a lower cost than in the case of using the electron beam welding method, and without requiring extra man-hours as in the case of using a brazing material having a high melting point.

Furthermore, according to the tenth invention of the present application, basically the same effect as that of the ninth invention can be obtained. In particular, since the above members are assembled together by press fitting, even if the force that releases the residual stress generated in the member during press fitting acts due to the thermal deformation due to heating / cooling during brazing, the force exerts both The members are not displaced relative to each other, and it is possible to prevent defective joining during brazing.

Further, according to the eleventh invention of the present application, basically, the same effect as that of the tenth invention can be obtained. Moreover, in particular, since the above-mentioned brazing part is to be quenched, even if it is subjected to the effects of stress due to thermal deformation due to heating and cooling during this quenching process, the brazing material Even if the brazing filler metal has a melting point (solidus line) lower than the heating temperature during quenching and is subjected to thermal stress in the semi-molten state, both members will not be displaced relative to each other and will be joined to the brazing part It is possible to reliably prevent the occurrence of defects. Further, by utilizing the heat change (heating and subsequent cooling) during the quenching treatment (that is, the brazing filler metal is melted in the heating step in the quenching treatment and then solidified in the cooling step), It is possible to perform brazing at the same time, and in this case, it is possible to significantly increase productivity as compared with the case where brazing and quenching are performed separately.

Further, according to the twelfth invention of the present application, basically, the same effect as that of the eleventh invention can be obtained. In particular, since the above-mentioned quenching treatment is carburizing and quenching, a brazed component is produced which is carburized and quenched while hardening only the surface portion and its vicinity where abrasion resistance etc. are required and maintaining the internal toughness. At this time, it is possible to reliably prevent the occurrence of defective joints in the brazed portion at low cost and without extra man-hours, and to improve productivity by simultaneously performing heat treatment and brazing. .

Further, according to the thirteenth invention of the present application, basically, the same effect as that of any one of the ninth to twelfth inventions can be obtained. In particular, since the above-mentioned member is a gear body and a shaft member that supports the rotational movement of the gear body, a low cost and extra man-hours are required when manufacturing a gear component having a two-part structure by brazing. Without fail, it is possible to reliably prevent the occurrence of a defective joint in the brazed portion, and it is possible to improve productivity by simultaneously performing heat treatment and brazing.

Furthermore, according to the fourteenth invention of the present application, basically, the same effect as that of the thirteenth invention can be obtained. In particular, in order to restrict the relative displacement between the gear body and the shaft member, the vicinity of the inner peripheral portion of the hole for fitting the gear body and the shaft member is partially plastically deformed. Securely integrated (so-called temporary fixing),
Even when the brazing material is subjected to the stress caused by thermal deformation due to heating and cooling during brazing, the melting point (solidus line) of the brazing material is lower than the heating temperature during brazing, and the brazing material is sufficiently solidified. Even if the members are subjected to the action of thermal stress or the like in the non-welded state, the two members are not displaced relative to each other, and it is possible to reliably prevent the joining failure from occurring in the brazed portion.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the embodiment is applied to a transmission gear having a two-part structure. 1 to 3 are a series of process explanatory views for explaining an assembly process of a mission gear 1 incorporated in a vehicle transmission according to an embodiment of the present invention. As shown in these drawings, the mission gear 1 has a two-part structure in which a clutch cone 2 for synchronization (synchronization) and a helical gear 3 having a tooth portion 3g on the outer peripheral portion are separately manufactured.
After the clutch cone 2 and the helical gear 3 are manufactured by machining or the like, the transmission gear 1 is constructed by assembling and joining the two. Then, in the state where the helical gear 3 is incorporated in the transmission, the rotation operation of the helical gear 3 is supported by the clutch cone 2.

The mission gear 1 is assembled by press fitting by fitting the inner circumference 2i of the hole 2H of the clutch cone 2 to the outer circumference 3a of the boss portion 3B of the helical gear 3. That is, as shown in FIG. 1, first, the helical gear 3 is placed on the press base 9, and the inner periphery 2 of the hole 2H of the clutch cone 2 is attached to the outer periphery 3a of the boss portion 3B of the helical gear 3.
After adjusting i, the pressing tool 4 of the pressing device is set. At this time, the brazing material 5 is previously arranged between the two parts 2 and 3, specifically, in the root region of the boss portion 3B of the helical gear 3. In this embodiment, the outer diameter of the boss portion 3B of the helical gear 3 is set to be larger than the inner diameter of the hole 2H of the clutch cone 2 by a predetermined amount (a little amount). Are assembled by press fitting.

Further, in the present embodiment, a plurality of punch portions 4P having a predetermined length extending vertically downward, for example, are provided on the lower surface side of the pressing tool 4. The punch part 4P
As can be seen from FIGS. 5 to 7, for example, four are installed in a circumferentially equidistant shape, and as shown in FIG. 8, the outer surface side of the tip end portion 4q of each punch portion 4P is tapered. Is formed in. Various shapes can be used as the tip shape of the punch portion. For example, in the punch portion 14P shown in FIG. 9, the tip portion 14q has a tapered outer surface, but the tip is It is slightly rounded. In addition, in the punch portion 24 shown in FIG.
q is formed in a cone shape (cone shape). Furthermore, FIG.
In the case of the punch portion 34 shown in FIG. 1, the punch portion 34 itself extends obliquely downward, and a groove portion 34s is formed at its tip portion 34q. Further, the number of punch portions may be plural (at least two), and more preferably, the punch portions may be equidistantly arranged as in the present embodiment.

Next, a predetermined press load F (eg, 1 ton (ton)) is applied to the pressing tool 4 and lowered, whereby the clutch cone 2 is pressed downward and the helical gear 3 is pressed.
Press-fit against. Then, as shown in FIG.
When the tip of the punch portion 4P of No. 4 is pressed into the upper surface of the boss portion 3B of the helical gear 3, the press load F is increased (for example, to 4 to 5 tons) as necessary, and the pressing tool 4 is further lowered. Proceed with press fitting. Then, this press-fitting operation is performed until the lower surface 2f of the clutch cone 2 comes into contact with the stopper surface 3f of the helical gear 3 and is stopped, as shown in FIG. At this time, as the pressing tool 4 descends, the punch 4P descends while the tip 4q of the punch 4P bites into the upper surface of the boss 3B of the helical gear 3.

Each punch portion 4P is located near the inner peripheral portion 2i of the hole portion 2H of the clutch cone 2 (in other words, when the pressing tool 4 is set in the press device (upper die)). The mounting position is set so as to correspond to the vicinity of the outer peripheral portion 3a of the boss portion 3B of the helical gear 3 in the combined state). Therefore, the tip 4q of each punch 4P bites into the upper surface of the boss 3B, so that the vicinity of the outer peripheral portion 3a of the boss 3B becomes the circumference 4
The protrusions 3q are formed by being plastically deformed at the equidistant positions. Each of the raised portions 3q is a tip portion 4q of the punch portion 4P.
The taper-shaped outer surface and the inner peripheral shape of the hole 2H of the clutch cone 2 are raised so as to prevent the clutch cone 2 and the helical gear 3 from coming off. When the assembly of the clutch cone 2 and the helical gear 3 by press fitting is completed in this way, as shown in FIG. 4, an assembly of the transmission gear 1 in which the both are integrated (so-called temporary fixing) is obtained.

In the present embodiment, the mission gear 1 described above is used.
Is subjected to carburizing and quenching after its assembly is completed, and brazing is simultaneously performed by utilizing a thermal change (that is, heating and subsequent cooling) in the carburizing and quenching process. Further, in the present embodiment, the clutch cone 2 and the helical gear 3 are manufactured by using SCr 420H defined in JIS G 4104 as a material, and the heat treatment chart of the carburizing and quenching treatment is shown in FIG.
As shown in. That is, after preheating at 830 to 850 ° C. for a predetermined time, it is held at 930 ° C. for a predetermined time (for example, about 90 minutes) to perform carburizing treatment and carbon diffusion. Then, after holding at the quenching heating temperature of 850 ° C., 230
It is set to quench in a salt bath at a temperature of ℃.

Further, in the present embodiment, the brazing material 5 used has a liquidus line of 910 ° C. and a solidus line of 780 ° C. The composition of this brazing filler metal 5 is basically C
u (copper) and Ag (silver) were mixed in a ratio of 3: 2, and Ni
By adding 1 to 5% by weight of (nickel), that is, Ni is 1 to 5% by weight and the balance is Cu / Ag = 3/2.
It was obtained by blending with. That is, in the case of the present embodiment, the solidus line (that is, the melting point) of the brazing filler metal 5 is lower than the quenching heating temperature.

Therefore, the assembled transmission gear 1
When placed in a heat treatment furnace for carburizing and quenching (carburizing furnace) and performing heat treatment according to the heat treatment chart shown in FIG. 12, the brazing filler metal 5 melts at the carburizing temperature (930 ° C.),
After that, even at the time of maintaining the quenching heating temperature of 850 ° C. (that is, before cooling), it does not solidify and is in a semi-molten state. And by being put in the salt bath, 23
It is rapidly cooled to 0 ° C. At this time, the transmission gear 1 (clutch cone 2 and helical gear 3) undergoes quenching deformation due to a large temperature change caused by rapid cooling, but in the present embodiment, the vicinity of the outer peripheral portion 3o of the boss portion 3B of the helical gear 3 is located at a plurality of locations. The ridges 3q are formed by being plastically deformed (four locations in the present embodiment), and the ridges 3q are formed.
q serves to prevent the clutch cone 2 and the helical gear 3 from coming off, and regulates the relative displacement between the two and the two.

Therefore, the clutch cone 2 and the helical gear 3 are thermally deformed integrally, and are not individually deformed. As a result, it is possible to reliably prevent the clutch cone 2 from rising above the helical gear 3. At this time, the clutch cone 2 and the helical gear 3
As for the internal stress of, the force acts in the direction in which the residual stress generated inside the members 2 and 3 by the press-fitting is released (that is, the direction in which the clutch cone tends to lift up with respect to the helical gear). Also above the raised portion 3q
It is received by the retaining action of No. 2 and there is no relative displacement between the two and 3. As a result, the gap between the lower end surface 2f of the clutch cone 2 and the stopper surface 3f of the helical gear 3 is maintained at the same level (20 to 40 μm) as before the heat treatment, and the lower end surface 2f of the clutch cone 2 and the stopper surface 3f of the helical gear 3 are maintained. The brazing material 5 that has penetrated between them does not break, and the clutch cone 2 and the helical gear 3 have the above-mentioned clutch cone lower end surface 2f and helical gear stopper surface 3f.
The brazing material 5 that has penetrated into the space between the inner circumference 2i of the clutch cone 2 and the outer circumference 3o of the boss portion of the helical gear 3 is firmly bonded to each other.

As described above, according to the present embodiment, the brazing material 5 is arranged between the clutch cone 2 and the helical gear 3, which are members to be assembled with each other, and at least one of these members ( In this embodiment, the helical gear 3) is partially plastically deformed so that the relative displacement between the helical gear 3) and the other member (clutch cone 2) is restricted. It is integrated (so-called temporary fixing). Therefore, in the brazing performed after this, even if the brazing filler metal 5 is subjected to the effects of stress and the like caused by thermal deformation due to heating and cooling, the melting point (solidus line) of the brazing material 5 in particular.
Is not lower than the heating temperature during brazing and the brazing material is not sufficiently solidified, even if it is subjected to thermal stress or the like, both members will not move relative to each other, resulting in poor jointing at the brazing part. Can be reliably prevented. That is, it is possible to prevent the occurrence of defective brazing at a lower cost than in the case of using the electron beam welding method, and without requiring extra man-hours as in the case of using a high melting point brazing material.

Further, since the above-mentioned partial plastic deformation is carried out while the members (the clutch cone 2 and the helical gear 3) are assembled together, it is not necessary to provide a separate step, and the production efficiency is not particularly affected, and the two members are not affected. It is possible to regulate the relative displacement of the above and prevent the occurrence of defective joining during brazing. Further, since the clutch cone 2 and the helical gear 3 are assembled to each other by press fitting, the member 2, when press fitting, is accompanied by thermal deformation due to heating and cooling during brazing.
Even when the force for releasing the residual stress generated in 3 is applied, the members 2 and 3 are not relatively displaced by the force, and it is possible to prevent the occurrence of defective joining in brazing.

Furthermore, the above-mentioned mission gear 1 is subjected to quenching treatment, in particular carburizing and quenching treatment,
Even if the brazing material is subjected to the effects of stress and the like caused by thermal deformation due to heating and cooling during the quenching treatment, the melting point (solidus line) of the brazing filler metal is lower than the heating temperature during the quenching treatment.
Even if is subjected to the action of thermal stress or the like in the semi-molten state, the two members are not displaced relative to each other, and it is possible to reliably prevent the occurrence of a joint failure in the brazed portion. In this case, since the brazing material 5 is melted in the heating step in the carburizing and quenching treatment and then solidified in the cooling step, brazing is performed at the same time as the carburizing and quenching treatment. The productivity can be greatly increased compared to the case where the insertion process is performed separately.

Although the above embodiment is applied to the joining of the transmission gear 1 having a two-divided structure incorporated in the automobile transmission, the present invention is not limited to such a case. Instead, it can be applied to the case of manufacturing various other brazed parts in which a plurality of members are assembled with each other and joined by brazing. Further, the heat treatment to be applied to the brazed component is not limited to the above-mentioned carburizing and quenching, but can be effectively applied to the case where ordinary quenching or surface quenching such as nitriding is performed. Further, it goes without saying that the present invention is not limited to the above-described embodiments, and various improvements and design changes can be made without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a part of a series of process explanatory views showing a process of assembling a transmission gear according to an embodiment of the present invention.

FIG. 2 is a part of a series of process explanatory views showing an assembly process of the mission gear.

FIG. 3 is a part of a series of process explanatory diagrams showing an assembly process of the mission gear.

FIG. 4 is an explanatory longitudinal sectional view showing a completed state of assembly of the transmission gear.

FIG. 5 is an overall perspective view of a pressing tool used in the assembly process of the mission gear.

FIG. 6 is a front view of the pressing tool.

FIG. 7 is a bottom view of the pressing tool.

FIG. 8 is an enlarged perspective view showing a punch portion of the pressing tool.

FIG. 9 is an enlarged perspective view showing a modified example of the punch portion.

FIG. 10 is an enlarged perspective view showing another modification of the punch section.

FIG. 11 is an enlarged perspective view showing still another modified example of the punch portion.

FIG. 12 is a heat treatment chart in the carburizing and quenching process of the mission gear.

FIG. 13 is a part of a series of process explanatory views showing a process of assembling a transmission gear according to a conventional example.

FIG. 14 is a part of a series of process explanatory views showing the assembly process of the transmission gear according to the conventional example.

[Explanation of symbols]

 1 ... Mission gear 2 ... Clutch cone 2H ... Clutch cone hole 2i ... Inner periphery of hole 3 ... Helical gear 3q ... Raised part 5 ... Brazing material

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Claims (14)

[Claims] 1. A method of manufacturing a brazed component in which a plurality of members are assembled together and joined by brazing, wherein a brazing material is arranged between the members to be assembled together, and at least one of these members is arranged. A method for manufacturing a brazed component, which comprises partially plastically deforming so that a relative displacement between the other member and the other member is restricted and then joining the assembled members by brazing. 2. At least one of the members is
The method for manufacturing a brazed component according to claim 1, wherein the brazed component is partially plastically deformed while being assembled to the other member. 3. The method for manufacturing a brazed component according to claim 1, wherein the members are assembled together by press fitting. 4. The method for manufacturing a brazed component according to claim 1, wherein the brazed component is quenched. 5. The brazing material is melted in a heating step during quenching treatment and then solidified in a cooling step so that brazing is performed at the same time as the quenching treatment. A method for manufacturing the brazed component described. 6. The method for manufacturing a brazed component according to claim 4, wherein the quenching treatment is carburizing quenching. 7. The method for manufacturing a brazed component according to claim 1, wherein the member is a gear main body and a shaft member that supports rotational movement of the gear main body. . 8. A plastic part is partially plastically deformed in the vicinity of an inner peripheral portion of a hole for fitting the gear body and the shaft member so that relative displacement between the gear body and the shaft member is restricted. The method for manufacturing a brazed component according to claim 7. 9. A brazing component comprising a plurality of members assembled together and integrally joined by brazing, wherein a brazing material is arranged between the members to be assembled together, and at least one of the above members is provided. A brazed component, characterized in that one member is plastically deformed so that the relative displacement between the other member and the other member is restricted, and then the assembled members are joined by brazing. 10. The brazed component according to claim 9, wherein the members are assembled to each other by press fitting. 11. The brazed part according to claim 9, wherein the brazed part is quenched. 12. The brazed component according to claim 11, wherein the quenching treatment is carburizing quenching. 13. The brazing component according to claim 9, wherein the member is a gear body and a shaft member that supports the rotational movement of the gear body. 14. A plastic part is partially deformed in the vicinity of an inner peripheral portion of a hole for fitting the gear body and the shaft member so that relative displacement between the gear body and the shaft member is restricted. The brazed part according to claim 13.