JPH1190622A - Brazing method and parts for brazing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize quality and to prevent deterioration in joining strength by forming a fitting part vertical to each end of the flat joining faces of parts to be brazed, setting a filler metal and flux on the faces, and engaging the parts with each other for brazing. SOLUTION: A speed change gear main body 10 is provided with a joining face flat in the vertical direction of the front end of an engaging axis part 13, with which the fitting hole 21 of a clutch cone 20 is engaged, and a filler metal setting groove in the front end of the engaging axis 13. The clutch cone 20 is provided with a flat joining face corresponding to that of the speed change gear main body 10 and an engaging part 26 vertical to the end of the joining face in its outer circumferential side. With a partially notched ring-shaped filler metal 30 set in the setting groove, and with a flux 40 applied on the surfaces of the engaging axis part 13, joining faces and the fitting part 16, the fitting hole 21 of the clutch cone 20 is press-fitted in the engaging axis part 13 of the speed change gear main body 10. The entirety so set is put in a carburizing furnace, heated and carburized. At the time of this brazing, the vaporization of the flux takes place in the space between the vertical fitting parts at the ends of the joining faces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for brazing a component having a flat joint surface and to the brazed component.

[0002]

2. Description of the Related Art When a gear member incorporated in a manual transmission of an automobile is manufactured by press-fitting a steel clutch cone into a transmission gear body and joining the gear member, conventionally, the joining between the transmission gear body and the clutch cone is conventionally performed. It was performed by electron beam welding.
However, in electron beam welding, thermal deformation of the clutch cone due to partial melting and solidification poses a problem, and a special vacuum chamber is required. There was such a problem.

Therefore, the transmission gear body and the clutch co
Japanese Patent Application Laid-Open No. Hei 8-2068 discloses that the brazing is carried out simultaneously with the carburizing by utilizing the heating for carburizing treatment.
No. 6 is shown.

[0004]

However, when a component having a flat joint surface 3 such as the transmission gear body 1 and the clutch cone 2 is brazed as shown in FIGS. 5 and 6, as shown in FIG. When the brazing material and the flux 6 are set and heated and brazed, the brazing material 5 melts and flows out to the outer peripheral end portions of the joining surfaces 3 and 4 as shown in FIG. There is a problem that the portion 8 remains and the joining area becomes small, so that joining strength cannot be obtained. This is presumably because the flux set together with the brazing material at the joint is vaporized, and the vaporized portion is oxidized by the carburizing gas, so that the flow of the brazing material stops and the unjoined portion remains.

Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to ensure that the outer peripheral end portion of the flat surface is securely brazed in a component having a flat joint surface. To obtain the required bonding strength.

[0006]

According to the present invention, there is provided a method for brazing a component having a flat joint surface, the method comprising the steps of: A first step of preparing a brazed part having a joint,
Next, a second step of setting the brazing material and the flux on the joining surface and fitting the brazed parts together, and a third step of heating the fitted thing to the brazing temperature and brazing It is.

In the above method, a vaporized portion of the flux is formed in a space formed by a vertical fitting portion at the end of the joining portion, and a flat joining surface can be secured as a whole joining surface. .

According to a second aspect of the present invention, in the first aspect of the invention, the brazing additional heat in the third step is performed by heating in a carburizing furnace. In the case of the above method, the brazing heat can be performed by heating with a carburizing furnace in the carburizing and quenching treatment of the brazing member, and brazing can be performed without requiring special heating for brazing. Cost can be reduced.

According to a third aspect of the present invention, in the first aspect of the invention, the brazing parts to be joined are a transmission gear body and a clutch cone. In the case of the above method, the joint area between the transmission gear body and the clutch cone is ensured, the quality is stabilized, and a decrease in strength can be prevented.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the brazing material is set by providing a brazing material setting groove on the outer periphery of the front end of the transmission gear body in the clutch cone fitting direction.

In the above method, since the brazing material can be reliably held in the set groove, the brazing operation can be easily performed without the brazing material dropping during transportation or heating in a carburizing furnace or the like.

According to a fifth aspect of the present invention, there is provided a brazing part to be brazed with a flat joining surface, wherein the brazing parts each having a perpendicular fitting portion at each end of the flat joining surface are fitted to each other. The vertical fitting is on the brazing part which is the vaporizing part of the flux.

In the above configuration, the vertical fitting portion formed at the end of the flat joining surface forms a vaporized portion of the flux, and the flat joining surface can be secured as the entire joining surface. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the present invention is applied to a case in which a gear member incorporated in a manual transmission of an automobile is manufactured by fitting and joining a steel clutch cone to a transmission gear body.

In FIG. 1, reference numeral 10 denotes a transmission gear body, and reference numeral 20 denotes a clutch cone. Transmission gear body 10
Is formed integrally with a gear portion 12 having gear teeth 11 on the outer periphery and a fitting shaft portion 13 into which a fitting hole 21 of the clutch cone 20 is fitted. A flat joining surface 14 is formed in a direction perpendicular to the front end of the fitting shaft portion 13 and on the back surface of the gear portion 12. Further, the transmission gear body 10 is provided with a set groove 15 of a brazing material having an annular shape and a semicircular cross section at the front end of the fitting shaft portion 13. On the outer periphery of the joint surface 14, a fitting portion 16 perpendicular to the joint surface 14 is provided.

The outer peripheral surface of the clutch cone 20 is tapered.
A cylindrical portion 22 having a conical shape and a gear portion 24 having gear teeth 23 on its outer periphery are integrally formed.
A fitting hole 21 is provided that can fit into the fitting shaft 13 of the transmission gear body 10 that penetrates the gear 2 and the gear 24 in the axial direction. At the front of the clutch cone 20, a cylindrical portion 22 is provided.
Is provided with a flat joining surface 25 perpendicular to the axis. This joint surface 25 is provided corresponding to the joint surface 14 of the transmission gear body 10. On the outer peripheral side of the joint surface 25 of the clutch cone 20, a fitting portion 26 perpendicular to the end of the joint surface 25 is provided. The fitting portion 26 fits with the fitting portion 16 of the transmission gear body 10 with a gap of 20 to 80 microns.

After the first step of separately preparing the transmission gear body 10 and the clutch cone 20 as described above, a second step as a next brazing preparation step is performed. That is, FIG.
Is set in the set groove 15 of the transmission gear body 10, and then the flux 40 is applied to the surface of the fitting shaft 13 of the transmission gear body 10, the joining surface 14 and the fitting. It is applied to the surface of the joint 16. As the brazing material, a Cu-Mn based brazing material for simultaneous carburizing and brazing as shown in JP-A-8-20688 is used. Next, the fitting hole 21 of the clutch cone 20 is press-fitted into the fitting shaft portion 13 of the transmission gear body 10 to obtain the state shown in FIG. In this case, the tip of the fitting portion 26 of the clutch cone 20 is fitted to the fitting portion 16 of the transmission gear body 10 to a depth of 0.5 to 1 mm.

With the brazing material 30 and the flux 40 set in the clutch cone 20, a brazing step as a third step is started. The brazing process is performed in the transmission gear body 10.
And carburizing and quenching of the clutch cone 20 at the same time. That is, what is set as shown in FIG.
It is carried into a carburizing furnace, heated and carburized. At this time, the brazing material 30 is melted and melted between the joint surface 14 and the joint surface 25 and between the fitting shaft 13 and the fitting hole 21 as shown in FIG. Try to penetrate by the function of flux. At this time, the flux in the flux vaporizing section 50 is vaporized because it is in direct contact with the carburizing gas, but vaporization is prevented at the joining surfaces 14 and 25 by changing its direction and being far from the flux vaporizing section 50, The joining surface 14 and the joining surface 25
The melted brazing material 31 of FIG.
The entire joining surface 25 is joined and solidified by quenching and cooling to complete brazing.

When the speed change gear body 10 is manufactured by forging, it is desirable to use a transfer claw for carrying the transfer gear as a spring steel to absorb a work holding position error and wear of the transfer claw. .

[0020]

As described above, according to the first aspect of the present invention, a brazing component having a flat fitting surface formed with a vertical fitting portion at each end of the flat joining surface is brazed. The vaporization of the flux occurs in the space of the vertical fitting portion at the end of the joining portion, and the flat joining surface can be secured as the entire joining surface.

According to the second aspect of the present invention, in the first aspect of the present invention, the additional heat for brazing is performed by heating the carburizing furnace, so that no special heating for brazing is required and the production cost is reduced. Reduction can be achieved.

According to the third aspect of the present invention, in the first aspect of the invention, the transmission gear body and the clutch cone are brazed to secure a joint area, so that the quality is stabilized and the strength is improved. A decrease can be prevented.

According to a fourth aspect of the present invention, in the third aspect of the invention, a brazing material set groove is provided on the outer periphery of the front end of the transmission gear body in the clutch cone fitting direction, and brazing is performed. There is no danger of falling during transportation or heating.

According to the fifth aspect of the present invention, the brazing parts each having a vertical fitting portion formed at each end of the flat joint surface are fitted and brazed, and the vertical fitting portion is formed of a flux. Since it is a vaporized portion, a flat joint surface can be secured as the entire joint surface.

[Brief description of the drawings]

FIG. 1 is a sectional view of a transmission gear body according to an embodiment of the present invention before fitting.

FIG. 2 is a schematic diagram showing a state in which a brazing filler metal and a flux are set in the transmission gear body in FIG.

FIG. 3 is a schematic diagram showing a state in which a clutch cone is pressed into the transmission gear body of FIG. 2;

FIG. 4 is an enlarged sectional view showing a state of a brazing material during simultaneous carburizing according to the present invention.

FIG. 5 is a cross-sectional view of a conventional state in which a brazing filler metal and a flux are set in a transmission gear body and a clutch cone is press-fitted.

FIG. 6 is an enlarged cross-sectional view of the state of FIG. 5 simultaneously with carburizing and brazing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transmission gear body 13 Fitting shaft part 14 Joining surface 15 Brazing material setting groove 16 Fitting part 20 Clutch cone 21 Fitting hole 25 Joining surface 26 Fitting part 30 Brazing material 40 Flux 50 Flux vaporizing part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16D 23/06 F16D 23/06 C F16H 55/17 F16H 55/17 Z

Claims (5)

[Claims] 1. A method of brazing a part with a flat joint surface, comprising: a first step of preparing a brazed part having a vertical fitting portion formed at each end of the flat joint surface; A second step of setting the brazing material and the flux on the joining surface and fitting the brazed parts together, and a third step of heating the fitted thing to a brazing temperature and brazing. Characteristic brazing method. 2. The brazing method according to claim 1, wherein the third step is performed by heating in a carburizing furnace. 3. The brazing method according to claim 1, wherein the brazing parts to be joined are a transmission gear body and a clutch cone. 4. The brazing method according to claim 3, wherein in the second step, the brazing material is set by providing a brazing material setting groove on the outer periphery of the front end of the transmission gear body in the clutch cone fitting direction. 5. A brazing part to be brazed with a flat joint surface, wherein the brazing parts having perpendicular fitting parts formed at respective ends of the flat joint surface are fitted and brazed together. A brazing part characterized in that the vertical fitting part serves as a flux vaporizing part.