JPH1137219A - Damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a big insertion force by integrally forming a projection part provided on the outer periphery side of a cylindrical part to one end of the axial direction of a sleeve, in a damper having a mass body connected to the inner periphery side of the sleeve inserted to the inner periphery side of the cylindrical part of a hub through an elastic body. SOLUTION: A damper has a hub 1 integrally formed a cylindrical part 1b to the outer periphery end of an end surface 1a, a sleeve 2 inserted to the inner periphery side of the cylindrical part 1b of the hub 1 and a mass body 4 connected to the inner periphery side of the sleeve 2 through an elastic body 3. A projection part 2b is integrally formed to one end of the axial direction of the sleeve 2 and a notch 2j for an emergency start is provided on this projection part 2b. As the sleeve 2 is formed in a ring by pressing a sheet metal, a bent part 2c with an arc section is formed between a main body part 2a and the projection part 2b and one part on the circumference of this bent part 2c is extended to the outside of the diameter direction and this extended part makes the projection part 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a damper, and more particularly to a damper suitable for being provided in a flywheel magnet of an outboard motor engine.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 9 and 10, a hub 1 in which a cylindrical portion 1b is integrally formed on an outer peripheral end portion of an end surface portion 1a, and a hub 1 fitted on the inner peripheral side of the cylindrical portion 1b. Sleeve 2
And a mass body 4 connected to the inner peripheral side of the sleeve 2 via an elastic body 3 made of a rubber-like elastic material.
A projection 1c is integrally formed at one end in the axial direction of b with a radially outward portion, and a cutout 1d for emergency start is provided in the projection 1c.
It has been known.

[0003] The hub 1 is formed by pressing a sheet metal.
Bent portions 1e and 1f each having an arc-shaped cross section are provided between the end surface portion 1a and the cylindrical portion 1b and between the cylindrical portion 1b and the overhang portion 1c.
Are formed. The sleeve 2 is also formed into a cylindrical shape by sheet metal.

The following disadvantages are pointed out in the above-mentioned conventional damper.

[0005] That is, a bent portion 1f is formed between the cylindrical portion 1b and the protruding portion 1c due to the integral formation of the protruding portion 1c at one axial end of the cylindrical portion 1b of the hub 1. Therefore, the sleeve 2 must be fitted on the inner peripheral side of a very narrow portion between the bent portion 1f and the bent portion 1e between the end face portion 1a and the cylindrical portion 1b. Therefore, since the width of the sleeve 2 is narrow and the fitting width of the hub 1 and the sleeve 2 is narrow, a necessary fitting force cannot be obtained, and the strength and stability of the fitting may be insufficient.

[0006]

SUMMARY OF THE INVENTION In view of the above, the present invention eliminates the need to integrally form a projecting portion at one axial end of a cylindrical portion of a hub, and makes the fitting width of the hub and sleeve relatively wide. It is an object of the present invention to provide a damper that can be set and that can obtain a relatively large fitting force.

[0007]

In order to achieve the above object, a damper according to a first aspect of the present invention comprises a hub having a tubular portion, and a sleeve fitted on the inner peripheral side of the tubular portion. ,
A damper having a mass connected to an inner peripheral side of the sleeve via an elastic body made of a rubber-like elastic material, and a damper provided with a protruding portion on the outer peripheral side of the cylindrical portion, wherein the protruding portion is It was decided to be integrally molded with one end in the axial direction of the sleeve.

According to a second aspect of the present invention, there is provided a damper comprising: a hub having a tubular portion; a sleeve fitted on an inner peripheral side of the tubular portion; and a rubber-like elastic material provided on an inner peripheral side of the sleeve. A damper having a mass connected via an elastic body made of stainless steel and having a projecting portion provided on the outer peripheral side of the tubular portion, making a cut in the tubular portion and standing up the cut portion. Thus, a tongue-shaped overhang is provided.

In the damper according to the first aspect of the present invention having the above-described structure, since the projecting portion is formed integrally with one axial end of the sleeve, the projecting portion is formed at one axial end of the cylindrical portion of the hub. Does not need to be integrally formed, and one end in the axial direction of the cylindrical portion can be terminated while remaining cylindrical, thereby making it possible to set a relatively large fitting width between the hub and the sleeve.

When the sleeve is formed by pressing a sheet metal, the cross section between the cylindrical body portion and the overhang of the sleeve, as in the prior art hub described above, is formed between the sleeve and the overhang. An arc-shaped bent portion is formed. The radius of curvature of the inner curved surface of the bent portion can be set extremely small depending on the shape of the jig. Therefore, in comparison with the prior art, the present invention (the invention according to claim 1) makes it possible to set the fitting width between the hub and the sleeve relatively wide.

FIG. 8 shows a cross section of a sleeve 2 formed by pressing a sheet metal. An overhang 2b is integrally formed at one axial end of the sleeve 2 outward in the radial direction. This sleeve 2
Is formed between the cylindrical main body portion 2a and the overhang portion 2b. Due to the characteristics of the sheet metal press, the center point 0 of the arc of the inner curved surface 2d of the bent portion 2c is closer to the bent portion 2c than the center point 0 'of the arc of the outer curved surface 2e depending on the shape of the jig (not shown). And the inner curved surface 2
The start position 2f of the arc d and the start position 2g of the arc of the outer curved surface 2e are displaced in the axial direction, and the width w of the outer peripheral surface 2h of the cylindrical main body 2a becomes wider than the width w 'of the inner peripheral surface 2i. In such a state, in the present invention, the wider outer peripheral surface 2h
Determines the fitting width w between the hub 1 and the sleeve 2. On the other hand, in the above-mentioned prior art in which the projecting portion 1c is integrally formed at one axial end of the cylindrical portion 1b of the hub 1, FIG.
Can be considered as it is, and the fitting width w 'of the hub 1 and the sleeve 2 is determined on the inner peripheral surface of the shorter tubular portion 1b. Therefore, according to the present invention, the fitting width of the hub and the sleeve can be set relatively wide by the difference in the width. If the fitting width between the hub and the sleeve is increased, the width of the cylindrical main body of the sleeve can be increased to increase its strength, and the width of the elastic body bonded to the cylindrical main body of the sleeve can be increased. Thus, the durability can be improved.

In addition, according to this damper, since the projecting portion is formed integrally with one end in the axial direction of the sleeve, the sleeve has a substantially L-shaped cross section at least at a part of the circumference where the projecting portion is provided. This also makes it possible to increase the strength of the sleeve.

In the damper according to the second aspect of the present invention having the above structure, a cut is made in the cylindrical portion of the hub, and the cut portion is raised to provide a tongue-shaped projection. Therefore, it is not necessary to integrally form the overhang portion at one end in the axial direction of the cylindrical portion, and it is possible to terminate the one end in the axial direction of the cylindrical portion while maintaining the cylindrical shape. Can be set relatively wide. The wider the hub and sleeve fit, the wider the sleeve can be and its strength can be increased, and the elastic body bonded to the sleeve can be wider to increase its durability. Becomes

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

First Embodiment As shown in FIGS. 1 and 2, a damper according to this embodiment has a cylindrical tubular portion 1b at an outer peripheral end of a flat annular end surface portion 1a in an axial direction. 1 and a cylindrical portion 1b of the hub 1
And a mass body (also referred to as a vibration ring) connected to the inner peripheral side of the sleeve 2 with a predetermined interference, and a rubber-like elastic material 3 connected to the inner peripheral side of the sleeve 2. A protrusion 2b is formed integrally at one end in the axial direction of the sleeve 2 toward the outside in the radial direction, and a cutout portion (also referred to as an engagement portion) for emergency start is formed in the protrusion 2b. ) 2j are provided.

The hub 1 is formed into an annular shape by pressing a sheet metal, and has a bent portion 1e having an arc-shaped cross section between the end surface portion 1a and the cylindrical portion 1b. One end in the axial direction of the tubular portion 1b ends while remaining cylindrical.

The sleeve 2 is also formed into an annular shape by pressing a sheet metal, and a bent portion 2c having an arc-shaped cross section is formed between a cylindrical main body portion 2a and an overhang portion 2b. The bent portion 2c is formed over the entire circumference at one end in the axial direction of the main body portion 2a, and a part of the circumference is extended radially outward.
b.

The elastic body 3 is formed by annular vulcanization molding of a predetermined rubber material, and is simultaneously vulcanized and bonded to the inner peripheral surface of the sleeve 2 and the outer peripheral surface of the mass body 4 simultaneously with the vulcanization molding. The mass body 4 is formed in a ring shape from a metal such as cast iron.

The damper having the above configuration is provided in the flywheel magnet of the outboard motor engine as a torsional damper (also referred to as a framag damper) and exerts a vibration absorbing function, similarly to the above-mentioned prior art. Therefore, since the fitting width between the hub 1 and the sleeve 2 is set wider than before, a relatively large fitting force can be obtained and a damper having a strong fitting structure can be constructed. Can be. If the fitting width between the hub 1 and the sleeve 2 is increased, the width of the cylindrical main body portion 2a of the sleeve 2 can be increased to increase its strength, and the cylindrical main body portion 2a of the sleeve 2 can be adhered to the cylindrical main body portion 2a. The durability of the elastic body 3 can be increased by increasing the width of the elastic body 3.

In addition, according to the damper having the above structure, since the overhang portion 2b is formed integrally with one end portion of the sleeve 2 in the axial direction, the sleeve 2 has at least one circumferential portion provided with the overhang portion 2b. The portion is formed in a substantially L-shaped cross section. Therefore, with this three-dimensional structure, the strength of the sleeve 2 can be increased, and the deformation of the sleeve 2 at the time of fitting can be effectively prevented.

The bent portion 2c having an arc-shaped cross section is
Since it is formed over the entire circumference at one end in the axial direction of "a", the strength of the sleeve 2 can also be increased by this.

Second Embodiment As shown in FIGS. 3 to 5, the damper according to this embodiment has a cylindrical tubular portion 1b at one end in the axial direction at the outer peripheral end of a flat annular end surface portion 1a. 1 and a cylindrical portion 1b of the hub 1
And a mass body (also referred to as a vibration ring) connected to the inner peripheral side of the sleeve 2 with a predetermined interference, and a rubber-like elastic material 3 connected to the inner peripheral side of the sleeve 2. A protrusion 2b is formed integrally at one end in the axial direction of the sleeve 2 toward the outside in the radial direction, and a cutout portion (also referred to as an engagement portion) for emergency start is formed in the protrusion 2b. 2), and a seal portion 5 made of a rubber-like elastic material is provided between the cylindrical portion 1b of the hub 1 and the sleeve 2.

The hub 1 is formed in an annular shape by pressing a sheet metal, and a bent portion 1e having an arc-shaped cross section is formed between the end face portion 1a and the cylindrical portion 1b. One end in the axial direction of the tubular portion 1b ends while remaining cylindrical.

The sleeve 2 is also formed into an annular shape by pressing a sheet metal, and a bent portion 2c having an arc-shaped cross section is formed between a cylindrical main body portion 2a and an overhang portion 2b. The bent portion 2c is formed over the entire circumference at one end in the axial direction of the main body portion 2a, and a part of the circumference is extended radially outward.
b.

The elastic body 3 is formed by annular vulcanization molding of a predetermined rubber material, and is simultaneously vulcanized and bonded to the inner peripheral surface of the sleeve 2 and the outer peripheral surface of the mass body 4 simultaneously with the vulcanization molding. The mass body 4 is formed in a ring shape from a metal such as cast iron.

The seal portion 5 is interposed between the end surface at one axial end of the cylindrical portion 1b of the hub 1 and the bent portion 2c of the sleeve 2, and is provided on the inner peripheral surface of the cylindrical portion 1b from the outer peripheral side. Sleeve 2
It seals seawater (salt water) or foreign matter so as not to enter between the outer peripheral surfaces of the main body portion 2a, and is vulcanized and molded by a predetermined rubber material in an annular shape. At the same time, it is vulcanized and bonded to the sleeve 2.

The seal portion 5 can be formed integrally with the elastic body 3 via the connecting portion 6 as shown. The connecting portion 6 is basically annular and covers the bent portion 2c of the sleeve 2 over the entire circumference, and the projecting portion 2b projects radially outward from the connecting portion 6.

The damper having the above structure is provided in a flywheel magnet of an outboard motor engine as a torsional damper (also referred to as a framag damper) and exhibits a vibration absorbing function, similarly to the above-mentioned prior art. Therefore, since the fitting width between the hub 1 and the sleeve 2 is set wider than before, a relatively large fitting force can be obtained and a damper having a strong fitting structure can be constructed. Can be. If the fitting width between the hub 1 and the sleeve 2 is increased, the width of the cylindrical main body portion 2a of the sleeve 2 can be increased to increase its strength, and the cylindrical main body portion 2a of the sleeve 2 can be adhered to the cylindrical main body portion 2a. The durability of the elastic body 3 can be increased by increasing the width of the elastic body 3.

In addition, according to the damper having the above configuration, since the overhang portion 2b is formed integrally with one end of the sleeve 2 in the axial direction, the sleeve 2 has at least one circumference provided with the overhang portion 2b. The portion is formed in a substantially L-shaped cross section. Therefore, with this three-dimensional structure, the strength of the sleeve 2 can be increased, and the deformation of the sleeve 2 at the time of fitting can be effectively prevented.

The bent portion 2c having an arc-shaped cross section corresponds to the main body portion 2.
Since it is formed over the entire circumference at one end in the axial direction of "a", the strength of the sleeve 2 can also be increased by this.

Since the seal portion 5 made of a rubber-like elastic material is provided between the tubular portion 1b of the hub 1 and the sleeve 2, seawater or foreign matter enters between the tubular portion 1b and the sleeve 2. Can be prevented. Therefore hub 1
It is possible to effectively prevent seawater from entering the fitting portion of the sleeve 2 and the fitting portion, and rust is generated in the fitting portion, and the fitting force is weakened by the rust.

Third Embodiment As shown in FIGS. 6 and 7, the damper according to the third embodiment has a cylindrical tubular portion 1b at the outer peripheral end of a flat annular end surface portion 1a in the axial direction. 1 and a cylindrical portion 1b of the hub 1
And a mass body (also referred to as a vibration ring) connected to the inner peripheral side of the sleeve 2 with a predetermined interference, and a rubber-like elastic material 3 connected to the inner peripheral side of the sleeve 2. 4, a notch is formed in the cylindrical portion 1b of the hub 1, and the notch is raised to the outer peripheral side, thereby providing a tongue-like projection 1g as shown in the figure. The projection 1g has a notch (also referred to as an engagement portion) 1 for emergency start.
h is provided.

The hub 1 is formed into an annular shape by pressing a sheet metal, and a bent portion 1e having an arc-shaped cross section is formed between the end face portion 1a and the cylindrical portion 1b. One end in the axial direction of the tubular portion 1b ends while remaining cylindrical.

The sleeve 2 is also formed into an annular shape by pressing a sheet metal. This sleeve 2
Is terminated in a cylindrical shape, and the axial position is aligned with the axial one end of the cylindrical portion 1b.

The elastic body 3 is formed by annular vulcanization molding of a predetermined rubber material, and is simultaneously vulcanized and bonded to the inner peripheral surface of the sleeve 2 and the outer peripheral surface of the mass body 4 simultaneously with the vulcanization molding. The mass body 4 is formed in a ring shape from a metal such as cast iron.

The damper having the above structure is provided in the flywheel magnet of the outboard motor engine as a torsional damper (also referred to as a framag damper) and exerts a vibration absorbing function, similarly to the above-mentioned prior art.
Because one end in the axial direction of the cylindrical portion 1b and one end in the axial direction of the sleeve 2 both end in a cylindrical shape, and the fitting width of the hub 1 and the sleeve 2 is set wider than before, the comparison is made. A large fitting force can be obtained, and a damper having a strong fitting structure can be configured. If the fitting width between the hub 1 and the sleeve 2 is increased, the width of the sleeve 2 can be increased to increase its strength, and the width of the elastic body 3 adhered to the sleeve 2 can be increased to improve its durability. Can also be increased.

When a bent portion having an arc-shaped cross section is formed at one end of the cylindrical portion 1b of the hub 1 in the axial direction or at one end of the sleeve 2 in the axial direction, the fitting of the sleeve 2 depends on the quality of the bent portion. However, there is a possibility that inconveniences such as oblique press-fitting and galling may occur.
Since neither one end in the axial direction of the cylindrical portion 1b nor one end in the axial direction of the sleeve 2 is formed with a bent portion having an arc-shaped cross section,
Such inconvenience does not occur. Therefore, a damper with excellent dimensional accuracy and stable quality can be configured.

[0038]

The present invention has the following effects.

That is, in the damper according to the first aspect of the present invention having the above structure, since the projecting portion is formed integrally with one end in the axial direction of the sleeve, one end in the axial direction of the cylindrical portion of the hub is formed. It is not necessary to integrally form the overhang portion, and it is possible to terminate one end portion of the cylindrical portion in the axial direction while maintaining the cylindrical shape, whereby the fitting width of the hub and the sleeve can be set relatively wide. . Therefore, a relatively large fitting force can be obtained, and a damper having a strong fitting structure can be formed. Also, if the fitting width between the hub and the sleeve is widened, the width of the sleeve can be increased to increase its strength, and the width of the elastic body bonded to the sleeve can be increased to increase its durability. .

In addition, according to this damper, since the overhang is formed integrally with one end of the sleeve in the axial direction, the sleeve has a substantially L-shaped cross section at least at a part of the circumference where the overhang is provided. Is molded. Therefore, with this three-dimensional structure, the strength of the sleeve can be increased, and the deformation of the sleeve at the time of fitting can be effectively prevented.

In the damper according to the second aspect of the present invention having the above-described structure, a cut is made in the cylindrical portion of the hub, and the cut-out portion is raised to provide a tongue-shaped projection. Therefore, it is not necessary to integrally form the overhang portion at one end in the axial direction of the cylindrical portion, and it is possible to terminate the one end in the axial direction of the cylindrical portion while maintaining the cylindrical shape. Can be set relatively wide. Therefore, a relatively large fitting force can be obtained, and a damper having a strong fitting structure can be formed. Also, if the fitting width between the hub and the sleeve is widened, the width of the sleeve can be increased to increase its strength, and the width of the elastic body bonded to the sleeve can be increased to increase its durability. .

In addition, according to this damper, both the one axial end of the cylindrical portion and the one axial end of the sleeve are not formed with a curved portion having an arcuate cross section, so that the dimensional variation due to the formation of the bent portion is reduced. Does not occur. Therefore, a damper with excellent dimensional accuracy and stable quality can be configured.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a damper according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is a front view of a main part of a damper according to a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view taken along line BB in FIG. 3;

FIG. 5 is an enlarged sectional view taken along line CC in FIG. 3;

FIG. 6 is a front view of a main part of a damper according to a third embodiment of the present invention.

FIG. 7 is an enlarged sectional view taken along line DD in FIG. 6;

FIG. 8 is a sectional view of a sleeve.

FIG. 9 is a front view of a main part of a damper according to a conventional example.

10 is an enlarged sectional view taken along line EE in FIG. 9;

[Explanation of symbols]

 Reference Signs List 1 hub 1a end face portion 1b cylindrical portion 1c, 1g, 2b overhang portion 1d, 1h, 2j cutout portion 1e, 1f, 2c bent portion 2 sleeve 2a body portion 2d inner curved surface 2e outer curved surface 2f, 2g start end position 2h outer peripheral surface 2i Inner peripheral surface 3 Elastic body 4 Mass body 5 Seal part 6 Connecting part

Claims (2)

[Claims] 1. A hub (1) having a tubular portion (1b),
A sleeve (2) fitted on the inner peripheral side of the cylindrical portion (1b), and a mass connected to the inner peripheral side of the sleeve (2) via an elastic body (3) made of a rubber-like elastic material. And a projecting portion (2b) on the outer peripheral side of the cylindrical portion (1b).
Wherein the overhanging portion (2b) is formed integrally with one end of the sleeve (2) in the axial direction. 2. A hub (1) having a cylindrical portion (1b);
A sleeve (2) fitted on the inner peripheral side of the cylindrical portion (1b), and a mass connected to the inner peripheral side of the sleeve (2) via an elastic body (3) made of a rubber-like elastic material. Body (4), and a projecting portion (1g) on the outer peripheral side of the cylindrical portion (1b).
In the damper provided with a tongue, a notch is formed in the cylindrical portion (1b), and the notch is raised to form a tongue-shaped overhang (1g).
A damper comprising: