JP4193528B2 - Method for manufacturing rolling bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a rolling bearing device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a rolling bearing device for an axle, an outer ring member that is non-rotatably supported on the vehicle body side, and a radially inner side of the outer ring member are rotatably arranged around a shaft center via double rows of balls. There is one having a hub shaft and an inner ring member that is rotatably integrated with the hub shaft.
[0003]
The hub axle has an annular recess formed on the outer peripheral surface of the vehicle inner side end portion, and the inner ring member is fitted on the annular recess. This inner ring member is assembled integrally with the hub shaft by caulking the end portion of the hub shaft on the vehicle inner side so as to expand radially outward. On the other hand, the balls in one row have the outer peripheral surface of the hub shaft as the inner ring raceway surface, and the balls in the other row have the outer peripheral surface of the inner ring member as the inner ring raceway surface (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Publication No.49-19361 [0005]
[Problems to be solved by the invention]
When the end portion on the vehicle inner side of the hub shaft is caulked at room temperature, the internal deformation resistance of the end portion on the vehicle inner side is large, and a large force is required for caulking, which is difficult to caulk and increases the machining cost.
[0006]
[Means for Solving the Problems]
The method of manufacturing a rolling bearing device according to the present invention includes a metal shaft disposed on the inner diameter side of a cylindrical outer ring member via a rolling element, and an outer fitting attachment to the end of the shaft on the vehicle inner side. A cylindrical portion provided at an end of the shaft body on the vehicle inner side is caulked against an end surface of the inner ring member, so that the shaft body and the inner ring member are integrated. a manufacturing method of which the rolling bearing device, wherein the shaft body radio frequency coil disposed in the vicinity of the cylindrical portion of the vehicle than the end surface of the vehicle inner side of the inner ring member from the end portion of the vehicle inner side of the cylindrical portion The axial range that reaches the position entering the outer side is heated, and the cylindrical portion in the heated state is expanded to perform the caulking. The high-frequency coil has an iron core inserted in the center. The tip portion of the shaft is disposed inside the cylindrical portion of the shaft body.
[0007]
As described above, by energizing the high-frequency coil and heating the axial end of the shaft body to a predetermined temperature, the internal deformation resistance of the axial end of the shaft body is reduced, and the shaft of the shaft body is reduced. Perform caulking work at the direction end.
[0008]
As described above, by energizing the high frequency coil and heating the axial end of the shaft body to a predetermined temperature, the internal deformation resistance of the axial end of the shaft body is reduced. The caulking work at the direction end becomes easy.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method for manufacturing a rolling bearing device according to an embodiment of the present invention will be described with reference to the drawings, taking an axle rolling bearing device as an example.
[0010]
FIG. 1 is a schematic cross-sectional view showing a use state of a rolling bearing device, FIG. 2 is a diagram of a shaft body judgment surface showing a hardened portion of the inner ring raceway surface and a heating range during caulking, and FIG. 3 is an end view of the shaft body FIG. 4 is a schematic cross-sectional view in which a high-frequency coil is disposed in the vicinity of an end of a shaft body.
[0011]
First, the configuration of the rolling bearing device 1 will be described with reference to FIG. The rolling bearing device 1 includes a cylindrical outer ring member 2 that is assembled non-rotatingly on the vehicle body side, and a shaft body (also referred to as a hub shaft) 3 that is provided on the inner diameter side of the outer ring member 2 so as to be rotatable about an axis. And have. Both the outer ring member 2 and the shaft body 3 are manufactured by hot forging using JIS S55C.
[0012]
A mounting flange 4 projecting radially outward is formed in the middle of the outer peripheral surface of the outer ring member 2. The outer ring member 2 is supported in a non-rotating manner by being fixed to a knuckle 5 in which the mounting flange 4 is assembled on the vehicle body side. Outer ring raceway surfaces 6 a and 6 b are formed on inner circumferential surfaces on both axial sides of the outer ring member 2.
[0013]
The shaft body 3 includes a cylindrical shaft portion 7 having a predetermined axial length, a hub flange 7a projecting radially outward from one axial direction of the shaft portion 7, that is, the vehicle outer side A, The hub flange 7a further includes a cylindrical guide portion 7b formed on the vehicle outer side A. A concave portion 7c that is concave on the vehicle inner side B is formed at the center of the guide portion 7b. The brake disc D and the tire wheel W are attached to the hub flange 7a in an overlapping manner.
[0014]
An inner ring raceway surface 12 a of one row of balls (an example of a rolling element) 10 held at a circumferentially equidistant position by a cage 8 is formed on the outer circumferential surface of the shaft portion 7 on the vehicle outer side A. An annular recess 14 is formed on the outer periphery of the end portion 21 on the vehicle inner side B of the shaft portion 7 so as to have a smaller diameter than other portions of the shaft portion 7. The center portion of the end portion 21 on the vehicle inner side B of the shaft portion 7 is turned, whereby a caulking recess portion 13 is formed.
[0015]
The rolling bearing device 1 includes an annular inner ring member 15 that is externally fitted to the annular recess 14 of the end portion 21 on the vehicle inner side B of the shaft portion 7. The inner ring member 15 is formed using JIS SUJ2. On the outer peripheral surface of the inner ring member 15, the inner ring raceway surface 12b of the balls 11 in the other row held at the circumferentially equidistant position by the cage 9 is formed.
[0016]
The end portion 21 on the vehicle inner side B of the shaft portion 7 is radially expanded outwardly to form a caulking portion 16, and the end surface on the vehicle outer side A of the caulking portion 16 is the vehicle inner side of the inner ring member 15. It is pressed against the end face of B. As a result, the shaft body 3 and the inner ring member 15 are assembled together so as to rotate about the shaft center 17.
[0017]
A ring between the outer ring member 2 and the shaft portion 7 of the shaft body 3 between the vehicle outer side A end inner peripheral surface of the outer ring member 2 and the vehicle outer side A end outer peripheral surface of the shaft portion 7 of the shaft body 3. A seal member 18 is provided for enclosing grease in the space and preventing intrusion of muddy water from the outside.
[0018]
In the rolling bearing device 1 having the above-described configuration, when the vehicle travels, the tire wheel and the brake disc rotate around the axis 17 and the shaft body 3 and the inner ring member 15 rotate around the axis 17.
[0019]
Next, a method for manufacturing the rolling bearing device 1 will be described. First, the outer ring member 2, the shaft body 3, and the inner ring member 15 are formed in a predetermined shape. At this time, the vehicle inner side B end portion 21 of the shaft body 3 is not yet crimped and remains cylindrical as shown in FIG.
[0020]
In the shaft body 2, the range including the raceway surface 12a indicated by the phantom line shown in FIG. 2 is a curing range C in which a thermosetting process is performed in order to obtain a required hardness. The curing range C includes the vehicle outer side A up to the boundary between the shaft portion 7 and the hub flange 7a, and the vehicle inner side B includes a part of the annular recess 14. Further, the inner ring member 15 is entirely quenched (ie, fully quenched) in order to ensure the hardness of the inner ring raceway surface 12b.
[0021]
Next, the balls 10 and 11 are assembled so that the balls 10 and 11 are fitted to the outer ring raceway surfaces 6 a and 6 b of the outer ring member 2 in a state where the balls 10 and 11 of each row are assembled to the cages 8 and 9, respectively. Subsequently, the shaft body 3 is assembled so that the shaft portion 7 is inserted from the vehicle outer side A of the outer ring member 2, and one row of balls 10 is fitted to both the outer ring raceway surface 6a and the inner ring raceway surface 12a. To do.
[0022]
Further, the inner ring member 15 is mounted so as to be fitted to the annular recess 14 from the vehicle inner side B of the shaft body 3, and the balls 11 in the other row are fitted to both the outer ring raceway surface 6b and the inner ring raceway surface 12b. To do.
[0023]
Next, a caulking method for the caulking portion 16 included in the method for manufacturing the rolling bearing device 1 will be described with reference to FIGS. As shown in FIG. 3, this caulking method is performed in the state of the assembly 20 in which the outer ring member 2, the shaft 3, the inner ring member 15, and the balls 10 and 11 are assembled as described above. FIG. 3 shows a state where the vehicle outer side A of the assembly 20 is directed downward so that the recess 7 c of the shaft body 7 is fitted to the support base 20.
[0024]
More specifically, as shown in FIG. 3, the end 21 on the vehicle inner side B of the shaft body 3 is heated in a state where the vehicle outer side A of the assembly 20 is directed downward. That is, as shown in the partially enlarged view of FIG. 4, the high-frequency coil 22 having a larger diameter than the end 21 on the vehicle inner side B of the shaft body 3 is arranged so as to fit the end 21. At this time, the high frequency coil 22 is not brought into contact with the inner ring member 15. By energizing the high-frequency coil 22, the axial range Y indicated by the imaginary line at the end 21 is heated.
[0025]
The range Y to be heated is set such that the curing range C by the heat treatment of the shaft body 3 and the inner ring member 15 are not tempered due to the influence of heating, and the grease applied to the inner ring member 15 is not altered. Is done.
[0026]
For example, as shown in FIG. 4, the heating range Y enters the vehicle outer side A slightly from the end surface 21 c of the end portion 21 on the vehicle inner side B of the shaft body 3 than the end surface 15 a on the vehicle inner side B of the inner ring member 15. At this position, the range does not reach the bottom surface 13a of the caulking concave portion 13. And the temperature of the axial direction range Y shall be 100 degreeC or more and 500 degrees C or less, Preferably shall be 200 degreeC or more and 500 degrees C or less.
[0027]
The heating range Y is adjusted by changing either or both of the amount of current flowing through the high frequency coil 22 or the distance between the high frequency coil 22 and the shaft body 3.
[0028]
Subsequently, the end portion 21 on the vehicle inner side B of the shaft body 3 is expanded radially outward in a state where the axial range Y at the end portion 21 on the vehicle inner side B of the shaft body 3 is maintained at the above temperature. Caulking like so.
[0029]
At this time, the tip forming portion 24 of the caulking tool 23 is inserted into the caulking recess 13, and the caulking tool 23 is rolled while applying a predetermined axial pressing force to the caulking tool 23, thereby forming the caulking portion 16. .
[0030]
And since the axial direction range Y in the edge part 21 of the vehicle inner side B of the shaft body 3 exists in the said temperature, internal deformation resistance is so small that it is heated. For this reason, compared with the case where the end portion 21 on the vehicle inner side B of the shaft body 3 is caulked at normal temperature, the axial pressing force and the rolling force can be reduced, and the caulking work is facilitated.
[0031]
In the said embodiment, the case where the high frequency coil 22 which has a larger diameter than the edge part 21 of the shaft 3 is arrange | positioned in the vicinity so that the edge part 21 may be fitted outside, and the edge part 21 is heated from the outer peripheral side is shown. It was. However, the present invention is not limited to this.
[0032]
5 and 6 show another embodiment for raising the axial range Y (indicated by the phantom line) at the end 21 on the vehicle inner side B of the shaft body 3 to the above temperature. . 5 and 6 show an embodiment in which the end 21 on the vehicle inner side B of the shaft body 3 is heated from the inner peripheral side. 5 and 6, the axial range Y at the end 21 of the shaft body 3 is the same as that in the above embodiment.
[0033]
FIG. 5 shows an embodiment in which the high-frequency coil 22 is inserted into the caulking recess 13 at the end 21 of the shaft body 3. The high-frequency coil 22 is arranged in the vicinity by keeping the bottom surface 13a and the outer peripheral surface 13b of the caulking concave portion 13 in a non-contact state, and in this state, the high-frequency coil 22 is energized to thereby end the shaft 3 21 is heated. Other caulking methods and manufacturing methods of the rolling bearing device 1 are the same as those in the above embodiment.
[0034]
In FIG. 6, the iron core 30 is inserted into the center of the high-frequency coil 22, the tip 30 a of the iron core 30 is inserted into the caulking recess 13 of the end 21 of the shaft body 3, and the high-frequency coil 22 is energized to the iron core 30. In this example, the end 21 of the shaft body 3 is heated via the. Also in this case, the front end portion 30a of the iron core 30 is disposed in the vicinity by maintaining a non-contact state with the bottom surface 13a of the caulking concave portion 13. Other caulking methods and manufacturing methods of the rolling bearing device 1 are the same as those in the above embodiment.
[0035]
In addition, according to each said embodiment, it can prevent that a fine crack arises in the surface of the location crimped besides the crimping operation | work becoming easy. Further, the axial force applied to the inner ring member 15 can be increased as compared with the case of caulking at room temperature.
[0036]
【The invention's effect】
As is apparent from the above description, according to the present invention, the internal deformation resistance of the axial end portion of the shaft body is obtained by energizing the high frequency coil and heating the axial end portion of the shaft body to a predetermined temperature. Therefore, the caulking work of the axial end portion of the shaft body can be easily performed.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a usage state of a rolling bearing device according to an embodiment of the present invention.
FIG. 2 is also a judgment surface view of a shaft body showing a hardening treatment portion of an inner ring raceway surface and a range to be heated during caulking.
FIG. 3 is a cross-sectional view used for explanation when caulking the end portion of the shaft body.
FIG. 4 is a schematic cross-sectional view in which a high-frequency coil is also disposed in the vicinity of the end of the shaft body.
FIG. 5 is an enlarged cross-sectional view of a main part showing another embodiment.
FIG. 6 is an enlarged cross-sectional view of a main part showing still another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus 2 Outer ring member 3 Shaft body 7 Shaft part 10,11 Ball | bowl 21 End part 13 in the vehicle inner side of a shaft part Caulking recessed part 15 Inner ring member 12a, 12b Inner ring raceway surface 16 Caulking part

Claims (1)

A metal shaft disposed on the inner diameter side of the cylindrical outer ring member via a rolling element, and an annular inner ring member that is externally fitted to the end of the shaft body on the vehicle inner side , A method of manufacturing a rolling bearing device in which a cylindrical portion provided at an end portion of a shaft body on a vehicle inner side is caulked against an end surface of the inner ring member, and the shaft body and the inner ring member are integrated. ,
A high-frequency coil disposed in the vicinity of the cylindrical portion of the shaft body has an axial range extending from the end of the cylindrical portion on the vehicle inner side to a position entering the vehicle outer side from the end surface of the inner ring member on the vehicle inner side. heating, and a diametrically enlarged the cylindrical portion of the heated state to perform the crimping,
The high-frequency coil has an iron core inserted in the center, and the tip of the iron core is disposed inside the cylindrical portion of the shaft body .
A method of manufacturing a rolling bearing device characterized by the above.

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