JPH0683863B2 - Shaft fixing method and jig for shaft fixing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) A shaft fixing method and a shaft fixing jig according to the present invention are incorporated in a valve mechanism of an engine used for traveling of an automobile, etc. It is used when fixing the shaft of a cam follower device that reduces the friction of parts and reduces the noise and the fuel consumption rate during engine operation.

(Prior Art) There are various types of engines used for running automobiles, etc., but in the case of a reciprocating piston type engine, all of the crankshaft rotations except for some two-cycle engines. An intake valve and an exhaust valve that are opened and closed in synchronization with are provided.

There are various types of valve operating mechanisms for driving these intake valves and exhaust valves, but for example, the SOHC type shown in Fig. 20 rotates at half the speed of the crankshaft. In the case of a 4-cycle engine, the intake valve 4 is moved by one camshaft 2 through the rocker arms 3 and 3.
And the exhaust valve 5 is reciprocally driven. Cams 6, 6 fixed to a camshaft 2 that rotates in synchronization with the crankshaft 1.
Is in contact with the end portions of the rocker arms 3 and 3 while the intake valve 4
And the exhaust valve 5 is reciprocally driven.

By the way, in recent years, the frictional force between the peripheral surfaces of the cams 6 and 6 and the opposing portions of the counterpart members such as the rocker arms 3 and 3 during engine operation is reduced to reduce the fuel consumption rate during engine operation. Therefore, a cam follower device that rotates with the rotation of the cams 6, 6 is provided at the facing portion.

That is, as shown in FIGS. 21 to 22, both ends of the shaft 8 are supported and fixed to a pair of support walls 7 and 7 provided at the end of the rocker arm 3 facing the cam 6 with a space therebetween. And this axis 8
A rotating member 10 in the form of a short cylinder is provided around the roller via rollers 9 and 9. Then, the outer peripheral surface of the rotating member 10 and the cam 6
The outer peripheral surface of the rotating member 10 is brought into contact with the outer peripheral surface of the rotating member 10 so that the rotating member 10 rotates about the shaft 8 as the cam 6 rotates.

By providing such a rotating member 10 and changing the friction between the cam 6 and the member facing the cam 6 from sliding friction to rolling friction, the fuel consumption rate is reduced.

(Problems to be Solved by the Invention) However, even in the above-described cam follower device for a valve operating mechanism of an engine, there still exist the following problems to be solved.

That is, in order to allow the cam follower device to perform stable operation over a long period of time, the shaft 8 supporting the rotating member 10 should be firmly fixed so as not to rotate with respect to the rocker arm 3 and other members facing the cam 6. Must be fixed.

When the shaft 8 rotates with respect to the above member, the outer peripheral surface of the end of the shaft 8 and the through holes 11, 11 formed in the supporting wall parts 7, 7 at the end of the rocker arm 3 for supporting the shaft 8 are formed. The inner peripheral surface gradually wears and the support of the shaft 8 becomes incomplete, and the rotating member
10 rattles as the cam 6 rotates.

For this reason, conventionally, as shown in FIG. 22, a part of a pair of support walls 7, 7 formed at intervals in members such as the rocker arm 3 which receives the movement of the cam 6 are aligned with each other. Both ends of the shaft 8 are fitted into the pair of through holes 11, 11 formed in the above, and both ends of the shaft 8 are respectively passed through the through holes 11 by a fixing jig as shown in FIGS. 23 to 24. By caulking the inner peripheral surfaces of the shafts 11, 11, the shaft 8 is prevented from rotating with respect to the support wall portions 7, 7 having the through holes 11, 11.

However, in the case of such a detent by simple caulking, the detent between the shaft 8 and the supporting wall portions 7 and 7 is achieved only by the frictional force of the caulking portion, so an extremely large force is applied to the shaft 8. If the shaft is applied, the shaft 8 may rotate.

Also, by crimping both ends of the shaft 8, the shaft 8
In order to prevent the rotation of the, it is necessary to strictly regulate the crimping depth. If the crimping depth is insufficient, the rotation of the shaft 8 is insufficient. On the contrary, if the crimping depth is excessive,
On the outer peripheral surface of the intermediate portion of the shaft 8, the portions in contact with the rollers 9, 9 are deformed, and the durability of the rollers 9, 9 is reduced. However, in the case of a conventional fixing jig as shown in Figs. 23 to 24, the force for pressing the fixing jig during caulking work gradually increases, so the caulking depth is strictly controlled. It was difficult to regulate.

In an automobile engine, at present, a strong force is not applied as much as rotating the shaft 8, but in recent years, the engine has been increased in rotation and output, and the force applied to the shaft 8 tends to be large. There is. Therefore, in order to cope with higher rotations and higher outputs that are expected in the future, it is necessary to make the rotation stopper of the shaft 8 stronger.

As a means for solving such a problem, the actual exploitation 64-34
In Japanese Patent No. 406, as shown in FIGS. 25 to 28, the shaft 8 is formed by caulking the end portion of the shaft 8 into a shape that is not concentric with the shaft 8.
A structure for preventing the rotation of the is proposed. However, in the case of the above-proposed structure, the crimping depth must be increased in order to reliably prevent the rotation.
It is not always easy to squeeze the ends of the. For this reason, not only the manufacturing cost of the cam follower device is increased, but also the deformation by caulking easily reaches the center of the shaft 8. If the deformation due to caulking extends to the center of the shaft 8, the rolling bearing, which uses the outer peripheral surface of the shaft 8 as an outer race, has a short life, which is not preferable.

In addition, Japanese Utility Model Laid-Open No. 63-133851 discloses a technique of caulking only a part of the end face of the shaft 8 toward the opening edge of the through hole 11, but the same disadvantage as described above is also caused. Occurs.

The invention relating to the shaft fixing method and the shaft fixing jig of the present invention has been made in view of the above circumstances.

(Means for Solving the Problem) Among the shaft fixing method and the shaft fixing jig of the present invention, the invention relating to the fixing method described in claim 1 is formed by spacing the shaft fixing member. After fitting both ends of the shaft into a pair of through holes formed in a part of the pair of supporting wall parts aligned with each other, both ends of the shaft are expanded and both ends of the shaft are expanded. By caulking toward the inner peripheral surface of the above hole,
By forming a first-stage crimped portion having a relatively gentle inclination angle with respect to the centerline of the shaft, and then further enlarging the diameter of the portion near the tip of the first-stage crimped portion over the entire circumference, Forming the second step caulking part with a relatively steep inclination angle,
The second step caulking portion is to be bitten into the inner peripheral surface of the through hole.

Further, in the invention relating to the fixing method described in claim 2, the first step caulking portion is formed, and then only a part in the circumferential direction of the portion near the tip of the first step caulking portion is expanded to have a plurality of second caulking portions. The stepped caulking portion is formed intermittently in the circumferential direction, and the second stepped caulking portion bites into the inner peripheral surface of the through hole.

Further, the invention relating to the shaft fixing jig described in claim 3 is made of a material harder than the shaft to be fixed, and a main portion which can be fixed to a pressing means for pressing the end face of the shaft,
An annular ridge formed on the end surface of the main portion so as to project in a V-shaped cross-section at a portion facing the end surface of the shaft, and having a tip edge diameter slightly smaller than the outer diameter of the shaft; A first conical surface inclined surface, which forms an outer peripheral surface of a portion near the tip of the strip, and has a relatively gentle inclination angle with respect to the central axis of the main portion,
The inclination angle with respect to the central axis of the main portion, which is formed on the outer side in the diametrical direction with respect to the first conical inclined surface and forms the outer peripheral surface of the proximal end portion of the protrusion, is relatively steep, And a conical inclined surface.

Further, in the invention relating to the shaft fixing jig described in claim 4, a discontinuous portion formed by being recessed from the second conical inclined surface is formed in a part of the outer peripheral edge of the protrusion. Have.

(Operation) When the shaft is fixed by the shaft fixing method of the present invention configured as described above, the both ends of the shaft are caulked toward the inner peripheral surface of the through hole formed in the support wall portion, and the center of the shaft is fixed. The shaft is temporarily fixed by forming the first-stage crimped portion having a relatively gentle inclination angle with respect to the line. Particularly, in the case of the shaft fixing method of the present invention, following the formation of the first-stage crimped portion, the portion near the tip of the first-stage crimped portion is further expanded in diameter, and the inclination angle with respect to the center line of the shaft is compared. Form a sudden second-stage crimp. Then, the second-stage crimped portion is made to bite into the inner peripheral surface of the through hole. A strong locking force works between the inner peripheral surface of the through hole and the outer peripheral edge of the second-stage crimped part, so even if a strong force is applied in the direction of rotation of the shaft,
This shaft will not rotate and the durability of the shaft fixed part will be improved. Also, caulking work is carried out in two stages,
Since both ends are largely projected outward, it is not necessary to increase the crimping depth even when the rotation is securely stopped.

In particular, as in the invention described in claim 2, only a part in the circumferential direction of the portion near the tip of the first step caulking portion formed at both ends of the shaft is expanded in diameter, and intermittently in the circumferential direction. When a plurality of second-stage crimped portions are formed on the inner surface of the through-hole, the stepped portions formed at both ends in the circumferential direction of the second-stage crimped portion are particularly strongly meshed with the inner peripheral edge of the through-hole, and the circumference of the shaft inside the through-hole Stop more reliably.

Then, when the above-mentioned fixing method is performed by the shaft fixing jig of the present invention, by simply pressing the jig against the end surface of the shaft, the both ends of the shaft are caulked toward the inner peripheral surface of the through hole. Then, both ends of the shaft can be further expanded.

Further, when the fixing jig of the present invention is pressed against the end surface of the shaft and the portion near the outer periphery of the end portion of the shaft is widened, the biting portion into the shaft changes from the first conical surface inclined surface to the second conical surface shape. The force required to press the fixing jig suddenly increases as it moves to the inclined surface. Therefore, it is possible to easily control the amount by which the tip of the fixing jig bites into the end face of the shaft, that is, the crimping depth.

(Example) Next, the present invention will be described in more detail with reference to the illustrated example.

1 to 4 show a first embodiment of the present invention corresponding to claims 1 and 3. The fixing jig 12 is formed in a cylindrical shape from a material that is sufficiently harder than the end portion of the shaft 8 to be fixed such as hardened steel. An annular ridge 15 is formed on the end surface 14 of the main portion 13 that can be fixed to the pressing means such as a pressing device for pressing the end surface of the shaft 8 to be fixed. The ridge 15 having a V-shaped cross section is formed so as to project from the end face 14, and the diameter R of the tip edge of the ridge 15 is
It is made slightly smaller than the outer diameter D of the shaft 8 to be fixed (D> R).

A portion of the outer peripheral surface of the ridge 15 near the tip is a first conical inclined surface 16. Of this first conical surface-shaped inclined surface 16,
Inclination angle α with respect to the straight line a parallel to the central axis of the main portion 13
(Corresponding to the angle of inclination with respect to the central axis) is relatively loose, and is a diametrically outer portion than the first conical surface-shaped inclined surface 16, and a portion of the outer peripheral surface of the ridge 15 near the base end is The second conical surface-shaped inclined surface 17 is used. The inclination angle β of the second conical inclined surface 17 with respect to the straight line a is relatively steep. Further, the inner peripheral surface of the protrusion 15 is a third conical inclined surface 18.

As the cross-sectional shape of the protrusion 15 as described above, a shape having the following numerical values is preferably used. That is, the inclination angle α of the first conical inclined surface 16 is 50 degrees, and its height h is 0.
2 mm, the inclination angle β of the second conical surface inclined surface 17 is 70 degrees, and the inclination angle γ of the third conical surface inclined surface 18 is 30 degrees.

The rocker arm 3 made of aluminum alloy or the like for fixing the shaft 8 for supporting the rotating member 10 by using the fixing jig 12 as described above has the above-mentioned FIGS. As shown in FIG. 5, a pair of support walls 7, 7 which are parallel to each other are formed at intervals.

A pair of through holes 11, 11 having circular cross sections are formed at positions of the pair of support walls 7, 7 which are aligned with each other,
Both ends of one shaft 8 made of bearing steel or the like are fitted in the through holes 11, 11 so that both ends of the shaft 8 can be supported by the support walls 7, 7.

The surface of the intermediate portion of the shaft 8 existing between the support wall portions 7 after completion of the fixing work is hardened by means of induction hardening or the like. However, both ends existing inside the through holes 11, 11 are not quenched and are soft enough to be plastically deformable. Further, the inner diameter of at least one of the through holes 11, 11 formed in the pair of support wall portions 7, 7 has an inner diameter of the shaft 8 before fixing (before expanding the end portion). When inserting both ends of the shaft 8 into the through holes 11, 11 with a diameter slightly larger than the outer diameter, the outer peripheral surface of the intermediate portion of the shaft 8 (which functions as an outer raceway on which the rollers 9, 9 come into contact) Make sure that it is not scratched. If both ends of the shaft 8 are securely supported,
The inner diameters of both through holes 11, 11 may be made larger than the outer diameter of the shaft 8 before being fixed.

A pair of support walls 7, 7 provided as described above, through holes 11,
After inserting both ends of the shaft 8 supporting the rotary member 10 into the roller 11 via the rollers 9 and 9, the press machine equipped with the fixing jig 12 is operated, and the end surface 14 of the fixing jig 12 is operated. The ridge 15 formed on the shaft 8 is strongly pressed against both end surfaces of the shaft 8.

By this pressing, the first and third conical inclined surfaces 16 and 18 at the tip end portion of the ridge 15 bite into the end face of the shaft 8 and the outer peripheral edge portion of the end face of the shaft 8 is expanded outward. .
As a result, the first-stage caulking portion 24 having a relatively gentle inclination angle with respect to the center line of the shaft 8 is formed at the end portion of the shaft 8 over the entire circumference thereof. That is, until then (before pressing)
The end portion of the shaft 8 having the shape as shown in FIGS. 5 to 6 is deformed as shown in FIGS. 7 to 8 (and by a chain line in FIG. 4).

In this manner, the first and third conical inclined surfaces 16 and 18 existing near the tip of the ridge 15 direct both ends of the shaft 8 toward the inner peripheral surface of the through holes 11 and 11. When the first-stage crimped portion 24 is formed by crimping, the outer peripheral surface of the first-stage crimped portion 24 is strongly pressed against the inner peripheral surface of the through hole 11, and the shaft 8
Is temporarily fixed.

In particular, when carrying out the shaft fixing method of the present invention, the operation of the press machine equipped with the fixing jig 12 is continued as it is,
The ridge 15 of the fixing jig 12 is further cut into the end face of the shaft 8.

As a result, the second conical inclined surface 17 formed in the portion of the protrusion 15 near the base end bites into the end face of the shaft 8 to further expand the diameter of the portion of the first step caulking portion 24 near the tip. , The second step caulking portion 25 having a relatively steep inclination angle with respect to the center line of the shaft 8
To form. That is, the tips of the first-stage crimped portions 24 formed on the outer peripheral edge portions of both ends of the shaft 8 are deformed radially outward as shown in FIGS. Become.
Then, the second step caulking portion 25 firmly bites into the peripheral edge portion of the opening of the through hole 11 as shown by the solid line in FIG.
As a result, the contact pressure between the both ends of the shaft 8 and the peripheral edge of the opening of the through hole 11 becomes extremely large, and the shaft 8 becomes difficult to rotate inside the through hole 11. As a result, wear due to rotation does not occur, and the durability of the shaft fixing portion is improved.

At the same time, the second conical inclined surface 17 having a steep inclination angle with respect to the central axis hits the end surface of the shaft 8. For this reason, the force required for the tip of the fixing jig 12 to bite into the end face of the shaft 8 rises sharply. Since the operation of the press machine is stopped on the basis of such a rapid increase in force, the caulking depth at the end of the shaft 8 does not become excessive.

The above-described series of fixing operations can be easily performed by simply pressing the fixing jig 12 and the end surface of the shaft 8 with a press machine or the like. Moreover, when the end portion of the shaft 8 is swaged by this pressing, the swaging work is performed in two steps.
Therefore, the caulking work can be performed with a comparatively small force, and the rotation of the shaft 8 can be reliably prevented without increasing the caulking depth.

Moreover, since the crimping depth of the end portion of the shaft 8 does not become excessively large, the length dimension of the portion where the outer diameter of the shaft 8 expands can be short,
On the outer peripheral surface of the intermediate portion of the shaft 8, the rollers 9, 9 (second 22
The part in contact with the rolling surface (Fig.) Does not deform.

That is, when it is attempted to sufficiently prevent the rotation of the shaft 8 by a fixing jig capable of performing only one step of caulking as shown in FIGS. 23 to 24, the caulking depth is considerably deep. Then, it becomes necessary to considerably widen the diameters of both ends of the shaft 8. Therefore, not only the force required for the caulking work becomes large, but also the portion near the middle of the shaft 8 may be deformed (expanded). As shown in FIG. 22, since the rolling surfaces of the rollers 9, 9 come into contact with the intermediate portion of the shaft 8, it is not preferable that the intermediate portion of the shaft 8 is deformed.

On the other hand, in the case of the present invention, since there is no fear that the crimping depth becomes excessive, the possibility that the intermediate portion of the shaft 8 is deformed can be eliminated, and the outer peripheral surface 9 of the intermediate portion of the shaft 8 can be eliminated. The contact state with the rolling surface of 9 can be maintained in a good state.

Next, FIGS. 11 to 13 show a second embodiment of the present invention corresponding to claims 2 and 4. Similarly to the fixing jig in the first embodiment described above, the fixing jig 12 in the present embodiment also has the outer peripheral surface of the tip end portion of the annular projection 15 formed on the end surface 14 of the main portion 13. Is a first conical surface with a relatively gentle inclination angle
16, the outer diameter of the first conical inclined surface 16 in the radial direction is closer to the base end of the outer peripheral surface of the projection 15, and the second conical inclined surface has a relatively steep inclination angle. Plane 17 and ridge
The inner peripheral surface of 15 is the third conical inclined surface 18.

Further, in the case of the present embodiment, recesses 19 and 19 which are recessed more spherically than the second conical inclined surface 17 are formed at four positions on the outer peripheral edge of the projection 15. And this recess 19,
The 19 parts are the discontinuous parts 20, 20 of the second conical inclined surface 17.

When fixing both ends of the shaft 8 to the inside of the through hole 11 by the fixing jig 12 of the present embodiment configured as described above, as in the case of the above-described first embodiment, one pair is used. Support wall portion 7,
After inserting both ends of the shaft 8 supporting the rotating member 10 (Fig. 22) through the rollers 9 and 9 into the pair of through holes 11 and 11 formed in 7, the fixing jig 12 is mounted. The pressed press machine. Then, the protrusion formed on the end surface 14 of the fixing jig 12
15 is strongly pressed against both end faces of the shaft 8 to spread the outer peripheral edge portion of the end face of the shaft 8 outward, and the end portion of the shaft 8 having the shape shown in FIGS. By deforming as shown in the drawing, the first-stage caulking portion 24 having a relatively gentle inclination angle with respect to the center line of the shaft 8 is formed.

From this state, the operation of the press machine equipped with the fixing jig 12 is continued as it is, and the protrusion 15 of the fixing jig 12 is
Further, the end face of the shaft 8 is made to eat. By this biting work, the second conical inclined surface 17 formed in the portion near the base end of the ridge 15 is bited into the end face of the shaft 8, and the tip end portion of the first step caulking portion 24 is further diameterd. By expanding the diameter outward
The second step caulking portion 25 having a relatively steep inclination angle with respect to the center line of the shaft 8 is formed.

In the case of the present embodiment, the second conical inclined surface 17 has the four discontinuous portions 20, 20 as described above. Therefore, the diameter expansion of the tip portion of the first step crimping portion 24 by the second conical inclined surface 17 is not performed over the entire circumference, and the second cone is formed inside the first step crimping portion 24. The end of the shaft 8 after the planar inclined surface 17 bites in is deformed as shown in FIGS.

That is, the portions 21, 21 where the second conical inclined surface 17 exists
Is further expanded outward to form second-stage crimped portions 25a, 25a. On the other hand, the discontinuous portion 20, the portion 22 facing the 20,
No. 22 does not change from the state shown in FIGS. 7 to 8, and the first stage caulking portion 24 remains as it is. As a result, step portions 23, 23 are formed between the two portions 21, 22. Since the step portions 23, 23 mesh with the opening edge portion of the through hole 11,
The shaft 8 having the step portions 23, 23 is reliably prevented from rotating inside the through hole 11, and the durability of the shaft fixing portion is further improved.

Next, FIGS. 16 to 17 show a third embodiment of the shaft fixing jig of the present invention, and FIGS. 18 to 19 show a fourth embodiment thereof.

First, in the case of the third embodiment shown in FIGS. 16 to 17, the concave portion 1 for forming the discontinuous portions 20, 20 of the second conical inclined surface 17 is formed.
By making the shapes of 9 and 19 arcuate notches, each recess 1
9 and 19 are deepened.

Also, in the case of the fourth embodiment shown in FIGS.
The recesses 19 and 19 are formed by cutting the locations in parallel with each other.

The operation itself of the fixing jigs of the third and fourth embodiments is almost the same as that of the jig of the second embodiment described above.

(Effect of the Invention) Since the shaft fixing method and the shaft fixing jig of the present invention are configured and operate as described above, it is possible to reliably prevent the shaft from rotating with respect to the member fixing the shaft. For this reason, when it is used to fix the shaft of the cam follower device for the valve operating mechanism of the engine, the durability of the cam follower device can be sufficiently maintained even if the output is improved by increasing the rotation speed and increasing the size of the engine. Is possible. Therefore, the present invention plays a large role in reducing the noise and fuel saving of the high-power engine.

Moreover, it is possible to make with a relatively simple caulking device, the caulking depth can be small, and since the caulking depth is not excessive, it is possible to manufacture a cam follower device with excellent durability at low cost. .

[Brief description of drawings]

1 to 4 show a first embodiment of the present invention corresponding to claims 1 and 3, FIG. 1 is an end view of a fixing jig, FIG. 2 is a sectional view, and FIG. Is an enlarged view of part A in FIG. 2, FIG. 4 is a cross-sectional view showing a state where the jig is used to fix the shaft, and FIGS. 5 to 10 show a process of deforming the shaft end. 5 to 6 are end views and cross-sectional views before deformation, and FIGS.
The figure is an end view and a cross-sectional view showing the first stage of deformation, 9th to 10th.
The figure is an end view and a cross-sectional view showing the state after completion of deformation,
FIG. 13 shows a second embodiment of the present invention corresponding to claims 2 and 4, FIG. 11 is an end view of a fixing jig, and FIG. 12 is a sectional view taken along the line BB of FIG. , Fig. 13 is a sectional view showing a state where the jig is used to fix the shaft, and Figs. 14 to 15 are end views and sectional views showing the state after the end of the shaft is deformed by the jig. FIGS. 16 to 17 show a third embodiment of the fixing jig of the present invention. FIG. 16 is an end view, FIG. 17 is a sectional view taken along line CC of FIG. 16, and 18 to 19 are shown. FIG. 18 also shows a fourth embodiment, FIG. 18 is an end view, FIG. 19 is a sectional view taken along line DD of FIG. 18, and FIG. 20 is a perspective view showing an example of a valve operating mechanism of an engine.
FIG. 21 is a side view of the cam follower device incorporated in the valve mechanism shown in FIG. 20, and FIG. 22 is a sectional view taken along the line EE of FIG.
23 to 24 are end views and cross-sectional views of a conventional fixing jig.
28 to 28 are side views of end portions of rocker arms, showing four examples in which the shaft is fixed by a conventional method. 1: Crankshaft, 2: Camshaft, 3: Rocker arm, 4: Intake valve, 5: Exhaust valve, 6: Cam, 7: Support wall part, 8: Shaft,
9: Roller, 10: Rotating member, 11: Through hole, 12: Fixing jig, 13: Main part, 14: End surface, 15: Projection, 16: First conical surface inclined surface, 17:
Second conical inclined surface, 18: Third conical inclined surface, 19:
Recessed portion, 20: discontinuous portion, 21, 22: portion, 23: step portion, 24: first stage crimped portion, 25, 25a: second stage crimped portion.

Claims (4)

[Claims] 1. Both ends of the shaft are fitted into a pair of through holes formed at positions that are aligned with each other in a part of a pair of support wall parts formed at intervals in a member to which the shaft is fixed. After that, expand both ends of this shaft, and crimp both ends of this shaft toward the inner peripheral surface of the through hole, so that the inclination angle with respect to the center line of the shaft is relatively gentle. By forming a portion, and then further expanding the diameter of the portion near the tip of the first-stage crimped portion over the entire circumference, a second-stage crimped portion having a relatively steep angle of inclination with respect to the center line of the shaft is formed, A shaft fixing method in which the second-stage crimped portion is cut into the inner peripheral surface of the through hole. 2. Both ends of the shaft are fitted into a pair of through holes formed at positions that are aligned with each other in a part of a pair of support wall parts formed at intervals in a member to which the shaft is fixed. After that, expand both ends of this shaft, and crimp both ends of this shaft toward the inner peripheral surface of the through hole, so that the inclination angle with respect to the center line of the shaft is relatively gentle. Part is formed, and then only a part of the first step caulking part in the circumferential direction of the part near the tip is expanded to form a plurality of second step caulking parts each having a relatively steep inclination angle with respect to the center line of the shaft. A shaft fixing method, which is formed intermittently in the circumferential direction and in which the second-stage crimped portion is cut into the inner peripheral surface of the through hole. 3. A main part made of a material harder than the shaft to be fixed and fixed to a pressing means for pressing the end face of the shaft, and an end face of the main part facing the end face of the shaft. Is formed so as to project in a V-shaped cross section, and has an annular ridge whose tip edge diameter is slightly smaller than the outer diameter of the shaft, and an outer peripheral surface of the ridge near the tip. The inclination angle with respect to the central axis of the portion is relatively gentle, and the first conical inclined surface and the diametrically outer portion of the first conical inclined surface are formed in the portion near the base end of the ridge. The inclination angle of the outer peripheral surface with respect to the central axis of the main portion is relatively steep,
A shaft fixing jig having a second conical inclined surface. 4. A discontinuous portion formed by being recessed from the second conical inclined surface at a part of the outer peripheral edge of the ridge,
The jig for fixing a shaft according to claim 3.