JP3024654U - Flywheel rotor with clutch - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] A flywheel is connected to a boss with sufficient strength by a connection method using a metal flow. A boss (2) is attached to a rotary shaft of an internal combustion engine, and an uneven portion (9) is provided on an outer periphery of a flange portion (2b) of the boss (2). The central hole 3a of the flywheel 3 is fitted into the flange portion 2b of the boss 2 having the uneven portion 9, and the uneven portion 9 is filled with a part of the flywheel 3 by plastic deformation to form the flange portion 2b of the boss 2. The flywheel 3 is connected to the outer circumference.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a flywheel rotor with a clutch.

[0002]

[Prior art]

 There is a flywheel rotor with a clutch that applies the rotational force of the starter to the flywheel rotor via a clutch to rotate the rotary shaft of the internal combustion engine.

4 and 5 show the structure of a conventional flywheel rotor with a clutch of this type. A boss 2 is attached to a rotary shaft 1 of an internal combustion engine, and a bottom surface of the flywheel 3 is attached to the boss 2 with a central hole 3a of the flywheel 3 fitted to an outer periphery of an intermediate step 2a of the boss 2. The flywheel 3 is attached to the flange portion 2b with the rivet 4 by being brought into contact with the flange portion 2b of the clutch 2 and the flange portion 2b of the boss 2 is fitted to the spigot portion 5a of the clutch 5 to clutch the boss 2. 5 is attached with a tightening screw 6. A permanent magnet 7 is attached to the inner circumference of the flywheel 3. Reference numeral 8 is a bolt that holds the tip of the boss 2 and is screwed to the threaded portion 1a of the tip of the rotary shaft 1.

However, in the flywheel rotor with a clutch having such a structure, since the flywheel 3 is integrated with the boss 2 by the rivet 4, the height of the head 4 a of the rivet 4 is increased at the bottom of the flywheel 3. There is a problem that the flywheel 3 cannot be downsized because the length of the flywheel 3 in the axial direction cannot be shortened due to the restriction due to the size.

As a means for connecting the flywheel 3 to the boss 2 that can reduce the size of the flywheel 3, a connecting method using a metal flow is being studied.

In this case, if the metal flow connecting method is applied to the structure shown in FIG. 4, the structure becomes as shown in FIG. That is, an uneven portion 9 formed by knurling is provided on the outer periphery of the intermediate step portion 2a of the boss 2, and the central step portion 3a of the flywheel 3 is fitted into the intermediate step portion 2a of the boss 2 having the uneven portion 9, The flywheel 3 is connected to the outer periphery of the intermediate step portion 2a of the boss 2 by filling a part of the flywheel 3 by plastic deformation (metal flow) in the uneven portion 9 on the outer periphery of the intermediate step portion 2a of the boss 2. Will be done.

With such a structure, the head 4 a of the rivet 4 does not project to the inner surface of the bottom of the flywheel 3, and the axial length of the flywheel 3 can be shortened. The size can be reduced.

[0008]

[Problems to be solved by the device]

 However, in the structure shown in FIG. 6, the intermediate step portion 2a of the boss 2 has a smaller outer diameter than the flange portion 2b. Therefore, when the uneven portion 9 is provided on the intermediate step portion 2a by knurling, the flange portion having a large outer diameter is used. 2b interferes with the knurling tool, making it difficult to form the uneven portion 9.

In addition, in the connection method using metal flow, it is preferable to increase the outer diameter of the metal flow processed portion as much as possible in order to increase the connection strength. However, in the structure shown in FIG. 6, the outer diameter of the intermediate step portion 2a of the boss 2 is changed. If it is attempted to increase the diameter, the outer diameter of the flange portion 2b of the boss 2 increases accordingly, and the outer diameter of the clutch 5 must be increased, which is difficult to implement.

An object of the present invention is to provide a flywheel rotor with a clutch capable of connecting a flywheel to a boss with sufficient strength by a metal flow connecting method.

[0011]

[Means for Solving the Problems]

 The present invention is directed to a flywheel rotor with a clutch having a structure in which a boss is attached to a rotary shaft of an internal combustion engine, a flywheel is attached to the boss, and a clutch is attached to the flywheel.

In the clutch flywheel rotor according to the present invention, the boss is provided with an uneven portion on the outer periphery of the maximum outer diameter portion, and the boss having the uneven portion is provided with a central hole of the flywheel at the maximum outer diameter portion. The flywheel is partly fitted, the flywheel is partially filled by plastic deformation in the uneven portion, and the flywheel is connected to the outer periphery of the maximum outer diameter portion of the boss.

When the flywheel is connected to the maximum outer diameter portion of the boss by the connecting method using the metal flow as described above, the flywheel can be connected to the boss with sufficient strength and the uneven portion can be formed without any trouble. be able to.

In such a structure for connecting the flywheel to the boss, the head portion of the rivet does not project to the inner surface of the bottom of the flywheel, and the axial length of the flywheel can be shortened. The size can be reduced.

In this case, an uneven portion can be provided on the outer circumference of the flange portion of the boss.

When the uneven portion is provided on the outer periphery of the flange portion of the boss in this manner, the flange portion has a large outer diameter, and the flywheel can be connected to the boss with sufficient strength.

It is also possible to provide an intermediate step portion on the back surface of the flange portion of the boss and connect the clutch to the intermediate step portion by contacting it.

With this configuration, the clutch can be attached to the boss without increasing the outer diameter of the clutch.

[0019]

[Embodiment of device]

 FIG. 1 shows a first example of a flywheel rotor with a clutch according to the present invention.

In the flywheel rotor with a clutch of this example, the uneven portion 9 is provided by knurling on the outer periphery of the flange portion 2b, which is the maximum outer diameter portion of the boss 2, and the flange portion 2b having the uneven portion 9 is provided. The hole 3a at the center of the flywheel 3 is fitted, and a part of the flywheel 3 is filled in the uneven portion 9 by plastic deformation (metal flow), and the flywheel 3 is fitted to the outer periphery of the flange 2b of the boss 2. 3 are connected. Other configurations are similar to those in FIG. 6 described above.

When the flywheel 3 is connected to the outer periphery of the flange portion 2b which is the maximum outer diameter portion of the boss 2 by the connecting method using the metal flow, the flywheel 3 can be connected to the boss 2 with sufficient strength. In addition, the uneven portion 9 can be formed without any trouble by knurling.

Further, in such a connecting structure of the flywheel 3 to the boss 2, the head portion of the rivet does not project to the inner surface of the bottom portion of the flywheel 3 and the axial length of the flywheel 3 can be shortened. Therefore, the flywheel 3 can be downsized.

FIG. 2 shows a second example of the flywheel rotor with a clutch according to the present invention.

In the clutched flywheel rotor of this example, the uneven portion 9 is provided by knurling on the outer periphery of the flange portion 2b, which is the maximum outer diameter portion of the boss 2, and the flange portion 2b having the uneven portion 9 is provided. The hole 3a at the center of the flywheel 3 is fitted, the uneven portion 9 is partially filled with the flywheel 3 by plastic deformation, and the flywheel 3 is connected to the outer periphery of the flange portion 2b of the boss 2. ing.

Further, a convex intermediate step portion 2c is provided on the back surface of the flange portion 2b of the boss 2, and the intermediate step portion 2c is fitted to the spigot portion 5a of the clutch 5 and, for example, as shown in FIG. They are connected in the same way. Other configurations are similar to those in FIG. 6 described above.

When the flywheel 3 is connected to the outer periphery of the flange portion 2b which is the maximum outer diameter portion of the boss 2 by the connecting method using the metal flow as described above, the flywheel 3 can be connected to the boss 2 with sufficient strength. In addition, the uneven portion 9 can be formed without any trouble by knurling.

Further, in such a connecting structure of the flywheel 3 to the boss 2, the head portion of the rivet does not project to the inner surface of the bottom of the flywheel 3 and the axial length of the flywheel 3 can be shortened. Therefore, the flywheel 3 can be downsized.

Further, when the intermediate step portion 2c is provided on the back surface of the flange portion 2b of the boss 2 and the clutch 5 is brought into contact with and connected to the intermediate step portion 2c, the clutch 5 can be connected without increasing the outer diameter of the clutch 5. Can be attached to the boss 2.

FIG. 3 shows a third example of the flywheel rotor with a clutch according to the present invention.

In the clutched flywheel rotor of this example, the uneven portion 9 is provided by knurling on the outer periphery of the flange portion 2 b, which is the maximum outer diameter portion of the boss 2, and the flange portion 2 b having the uneven portion 9 is provided. The central hole 3a of the flywheel 3 is fitted, the uneven portion 9 is partially filled with the flywheel 3 by plastic deformation, and the flywheel 3 is connected to the outer periphery of the flange portion 2b of the boss 2. ing.

Further, a concave intermediate step portion 2c is provided on the back surface of the flange portion 2b of the boss 2, and the clutch 5 is fitted to the intermediate step portion 2c, for example, in the same manner as shown in FIG. Has been. Other configurations are similar to those in FIG. 6 described above.

With such a structure, the same effect as that of the second example can be obtained.

[0033]

[Effect of device]

 In the flywheel rotor with a clutch according to the present invention, a concavo-convex portion is provided on the outer periphery of the maximum outer diameter portion of the boss, and a central hole portion of the flywheel is fitted to the maximum outer diameter portion of the boss having the concavo-convex portion. , The flywheel is partially filled by plastic deformation in the uneven portion and the flywheel is connected to the outer periphery of the maximum outer diameter portion of the boss, that is, the flywheel is connected to the outermost diameter portion of the boss by metal. Since they are connected by the flow connection method, the flywheel can be connected to the boss with sufficient strength, and the concave and convex portions can be formed without any problem.

In such a structure for connecting the flywheel to the boss, the head of the rivet does not project to the inner surface of the bottom of the flywheel, and the axial length of the flywheel can be shortened. The size can be reduced.

Further, when the uneven portion is provided on the outer periphery of the flange portion of the boss, the flange portion has a large outer diameter, and the flywheel can be connected to the boss with sufficient strength.

Further, if an intermediate step portion is provided on the back surface of the flange portion of the boss and the clutch is connected to and connected to the intermediate step portion, the clutch can be attached to the boss without increasing the outer diameter of the clutch. .

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a first example of an embodiment of a flywheel rotor with a clutch according to the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a second example of an embodiment of a flywheel rotor with a clutch according to the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a third example of an embodiment of a flywheel rotor with a clutch according to the present invention.

FIG. 4 is a longitudinal sectional view of a main part of a conventional flywheel rotor with a clutch.

5 is a longitudinal sectional view of a main part of the flywheel rotor with clutch shown in FIG. 4 at another position.

FIG. 6 is a longitudinal sectional view of a main part of a flywheel rotor with a clutch having a structure expected when connecting a flywheel to a boss by a metal flow connecting method.

[Explanation of symbols]

 1 rotary shaft 1a screw part 2 boss 2a intermediate step part 2b flange part 2c intermediate step part 3 flywheel 3a hole part 4 rivet 4a head part 5 clutch 5a inlay part 6 tightening screw 7 permanent magnet 8 bolt 9 uneven part

Claims (3)

[Scope of utility model registration request] 1. A boss is attached to a rotary shaft of an internal combustion engine,
A flywheel rotor with a clutch, wherein a flywheel is attached to the boss, and a clutch is attached to the flywheel, wherein an uneven portion is provided on an outer periphery of a maximum outer diameter portion of the boss, and the boss having the uneven portion. A hole in the center of the flywheel is fitted to the maximum outer diameter portion of the boss, the flywheel is partially filled in the uneven portion by plastic deformation, and the flywheel is attached to the outer periphery of the maximum outer diameter portion of the boss. A flywheel rotor with a clutch that is connected. 2. The flywheel rotor with clutch according to claim 1, wherein the uneven portion is provided on the outer periphery of the flange portion of the boss. 3. The clutch according to claim 1, wherein an intermediate step portion is provided on a back surface of the flange portion of the boss, and the clutch is brought into contact with and connected to the intermediate step portion. Flywheel rotor with.