JP7441751B2 - Torsion damper with bending damper - Google Patents

Description

The present invention relates to a torsional damper with a bending damper related to vibration isolation technology for a rotational drive system.

BACKGROUND ART A torsional damper with a bending damper is conventionally known, which is attached to an end of a shaft member that rotates around a rotation axis and absorbs vibrations of the shaft member. Such a torsional damper with a bending damper absorbs the torsional vibration (vibration in the circumferential direction of the shaft member) generated in the shaft member of the rotational drive system of an automobile etc. by the resonant operation of the torsional damper part. Since the bending vibration (radial direction vibration of the shaft member) generated in the bending damper is absorbed by the resonance operation of the bending damper, it is possible to absorb and reduce two types of vibration with one damper device (see, for example, Patent Document 1). . Here, a conventional torsional damper with a bending damper that suppresses vibrations of a crankshaft, which is a shaft member in a rotational drive system of an automobile, will be explained by taking the torsion damper with a bending damper described in Patent Document 1 as an example.

FIG. 4 is a sectional view showing the configuration of a conventional torsional damper 1' with a bending damper.

The torsional damper 1' with a bending damper includes a hub 2', a damper mass 3', a damper rubber 4', a resin stopper 5', and a cap member 6'. The hub 2' is a hollow housing into which the end of the crankshaft 100 is inserted. The damper mass 3' is a hollow member that is disposed inside the hub 2' and has a cylindrical internal space that is approximately concentric with the crankshaft 100 inserted into the hub 2'. The damper rubber 4' is a member made of a rubber member and adhered to one end of the damper mass 3' inside the hub 2'. The resin stopper 5' is an annular member disposed between the outer circumferential surface of the remaining portion of the damper mass 3' other than the above-mentioned one end and the inner circumferential surface of the hub 2'. The cap member 6' is a member disposed near the end of the damper mass 3' opposite to the above-mentioned one end. Further, the torsional damper 1' with a bending damper includes a plate 7' bolted to the hub 2', and the damper rubber 4' is bonded to this plate 7' to support the damper mass 3'. With this configuration, each part of the torsional damper 1' with a bending damper rotates as the crankshaft 100 rotates around the rotation axis.

When the crankshaft 100 rotates around a rotating shaft in response to power from an internal combustion engine such as an engine, vibrations in the bending direction (radial direction) of the crankshaft 100 are likely to occur. In the torsional damper 1' with a bending damper, a damper mass 3' supported by a damper rubber 4' plays a role in mitigating such vibrations in the bending direction. Vibration is suppressed. In addition to vibrations in the bending direction, vibrations of the crankshaft 100 include vibrations in the torsional direction of the rotating shaft of the crankshaft 100, and the torsional damper 1' with a bending damper is designed to absorb such vibrations in the torsional direction. Although there is a configuration that alleviates the problem (see Patent Document 1), its explanation will be omitted here.

As described above, the damper mass 3' is a hollow member having a cylindrical internal space, but its center of gravity is slightly deviated from the rotation axis of the crankshaft 100 due to manufacturing reasons. Therefore, when the crankshaft 100 rotates around the rotation axis, centrifugal force acts on the damper mass 3' in the direction in which the center axis of the damper mass 3' deviates from the rotation axis of the crankshaft 100. Due to this centrifugal force, the damper rubber 4' supporting the damper mass 3' is also deformed in the above-mentioned direction of displacement. This deformation of the damper rubber 4' further increases the deviation of the center of gravity axis of the damper mass 3' from the rotation axis of the crankshaft 100, and as a result, the centrifugal force on the damper mass 3' increases. If such an increase in the deviation of the center of gravity axis and an increase in the centrifugal force are repeated and the centrifugal force exceeds the permissible durability of the damper rubber 4', there is a risk that the damper rubber 4' will be damaged. . Here, in the torsional damper 1' with a bending damper, the above-mentioned resin stopper 5' is provided on the outer peripheral side of the damper mass 3', and due to the presence of this resin stopper 5', the damper mass 3' moves away from the rotating shaft. A large displacement in the direction (direction of centrifugal force, ie, radial direction) is prevented. As a result, large deformation of the damper rubber 4' is suppressed, and damage to the damper rubber 4' is avoided. Furthermore, the occurrence of abnormal noise due to contact between the damper mass 3' and the inner circumferential surface of the hub 2' and wear of the damper mass 3' are also suppressed.

JP2019-108911A

The resin stopper 5' is a member that plays an important role in avoiding damage to the damper rubber 4', but it may fall off due to the impact from the damper mass 3', so it is not used in the torsional damper 1' with a bending damper. , the cap member 6' prevents the resin stopper 5' from falling off.

However, if a cap member 6' is separately provided to prevent the resin stopper 5' from falling off, there is a concern that the number of parts will increase and manufacturing costs will increase.

In view of the above circumstances, the present invention realizes a torsional damper with a bending damper suitable for reducing manufacturing costs.

In order to solve the above problems, the present invention provides the following torsional damper with a bending damper.

[1] A first cylindrical part into which an end of a shaft member rotating around a rotation axis is inserted, and a second cylindrical part having a cylindrical shape concentric with the first cylindrical part and having an inner diameter larger than the first cylindrical part. a hub that is a hollow housing having a cylindrical portion and a connecting portion that connects the first cylindrical portion and the second cylindrical portion; and a damper mass disposed inside the hub, a mass cylindrical part concentric with the first cylindrical part and the second cylindrical part; and a protrusion protruding from the outer circumferential surface of the mass cylindrical part at an end of the mass cylindrical part that is farther from the first cylindrical part of the hub. a damper mass disposed inside the hub between the damper mass and the inner circumferential surface of the second cylindrical portion of the hub in a manner surrounding the protrusion of the damper mass; a damper rubber made of a rubber member disposed on an end face of the damper mass that is far from the first cylindrical portion and supports the damper mass; a C-shaped ring made of resin and having a C-shape in which a part of the annular shape is missing, surrounds the periphery of the mass cylindrical portion at the end, and the inner peripheral surface of the hub is provided with a C-shaped ring of the damper mass. A groove is formed around the inner circumferential surface of the hub at a position facing the C-shaped ring surrounding the mass cylindrical portion, and the C-shaped ring extends linearly in the direction of the rotation axis. At least a portion of the C-shaped ring surrounds the outer circumferential surface of the mass cylindrical portion of the expanding damper mass in a spaced state, and fits into the groove formed on the inner circumferential surface of the hub. A torsional damper with a bending damper.

[2] A sleeve having a cylindrical side surface that fits inside the second cylindrical portion of the hub, and the damper mass is vulcanized and bonded to the inside of the sleeve using the material of the damper rubber before hardening. The torsional damper with a bending damper according to [1], wherein the damper mass and the damper rubber are arranged inside the hub by being press-fitted inside the second cylindrical portion of the hub.

[3] A second damper rubber made of a rubber member, which is arranged on the outer peripheral surface of the hub and surrounds the hub; and a second damper rubber which is arranged on the second damper rubber and surrounds the hub via the second damper rubber. The torsional damper with a bending damper according to [1] or [2], further comprising a belt-shaped second damper mass.

In the present invention, the C-shaped ring surrounds the outer circumferential surface of the mass cylindrical portion of the damper mass extending linearly in the direction of the rotation axis, with at least a portion of the C-shaped ring being spaced apart from the outer circumferential surface of the mass cylindrical portion of the damper mass, and the hub It fits into a groove formed on the inner circumferential surface of. By fitting into this groove, the C-shaped ring is positioned in the direction of the rotation axis. The presence of the C-shaped ring at this position restricts displacement of the damper mass from the rotation shaft (position displacement of the damper mass in the direction away from the rotation shaft (direction of centrifugal force)).

In this way, in the present invention, the displacement of the damper mass from the rotating shaft is regulated by the single C-shaped ring positioned in the direction of the rotating shaft. A member for preventing falling off, such as the cap member 6' of the torsional damper 1' with a bending damper, is not necessary. As a result, in the present invention, large displacement of the damper mass in the direction away from the rotating shaft (direction of centrifugal force) is prevented, and damage to the damper rubber is avoided without increasing the number of parts. In particular, since the C-shaped ring is a resin member with a part of the annular shape missing, the diameter can be changed by deformation, and it can be easily placed in the groove.

As described above, the present invention realizes a torsional damper with a bending damper suitable for reducing manufacturing costs.

FIG. 2 is a cross-sectional view showing the configuration of a torsional damper with a bending damper according to the present embodiment. FIG. 2 is an external view of the C-shaped ring in FIG. 1; FIG. 2 is an enlarged view of the periphery of the C-shaped ring in FIG. 1; FIG. 2 is a cross-sectional view showing the configuration of a conventional torsional damper with a bending damper.

Embodiments of the present invention will be described below with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and it is understood that changes and improvements in the design may be made as appropriate based on the common knowledge of those skilled in the art without departing from the spirit of the present invention. It should be.

FIG. 1 is a sectional view showing the configuration of a torsional damper 1 with a bending damper according to the present embodiment.

The torsional damper 1 with a bending damper is a mechanism that is attached to the end of a shaft member (not shown) that rotates around a rotating shaft 10 to absorb vibrations of the shaft member, and includes a hub 2, a damper mass 3, and a damper rubber. 4, and a C-shaped ring 5. As the shaft member rotates around the rotating shaft 10, each of these parts also rotates.

The hub 2 is a hollow housing into which an end of a shaft member (not shown) that rotates around the rotating shaft 10 is inserted, and includes a first cylindrical portion 21, a second cylindrical portion 22, a connecting portion 23, and the like. It is equipped with The first cylindrical portion 21 is a portion into which the end portion of the shaft member is inserted. The second cylindrical portion 22 has a cylindrical shape concentric with the first cylindrical portion 21 and has a larger inner diameter than the first cylindrical portion 21 . The connecting portion 23 is a portion that connects the first cylindrical portion 21 and the second cylindrical portion 22. Note that, inside the hub 2, there is a connecting member such as a bolt for connecting the end of the shaft member inserted into the first cylindrical part 21 to the hub 2, but its illustration is omitted in FIG. There is. Here, examples of the shaft member include a crankshaft that transmits power obtained from a power source such as an engine to wheels in an automobile.

The damper mass 3 is a member disposed inside the hub 2, and has a mass cylindrical portion 31 and a protrusion 32. The mass cylindrical portion 31 is a substantially cylindrical portion concentric with both the first cylindrical portion 21 and the second cylindrical portion 22 of the hub 2 . On the other hand, the protrusion 32 is a portion protruding from the outer circumferential surface of the mass cylindrical portion 31 at the end 31 a of the mass cylindrical portion 31 farther from the first cylindrical portion 21 of the hub 2 .

The damper rubber 4 is a member made of a rubber member and supports the damper mass 3. The damper rubber 4 is disposed inside the hub 2 between the damper mass 3 and the inner circumferential surface of the second cylindrical portion 22 of the hub 2 in a manner surrounding the protrusion 32 of the damper mass 3, and also It is also arranged on the end face of the damper mass 3 farther from the section 21.

When a shaft member (not shown in FIG. 1) rotates around the rotating shaft 10 in response to power from an external power source such as an internal combustion engine, the bending direction of the shaft member (direction perpendicular to the rotating shaft 10) vibration is likely to occur. In the torsional damper 1 with a bending damper, the damper mass 3 supported by the damper rubber 4 plays a role as a weight to alleviate such vibrations in the bending direction, and due to the presence of this damper mass 3, the vibrations in the bending direction of the shaft member are reduced. It can be suppressed. In addition to vibrations in the bending direction, vibrations of the shaft member also include vibrations in the torsional direction of the rotating shaft 10 of the shaft member. A configuration is also provided, which will be described later.

Next, the C-shaped ring 5 will be explained.

FIG. 2 is an external view of the C-shaped ring 5 shown in FIG.

As shown in FIG. 2, the C-shaped ring 5 is a resin member having a C-shape in which a part of the annular shape is missing. As shown in FIG. 1 , the C-shaped ring 5 surrounds the mass cylindrical portion 31 at the end 31 b of the mass cylindrical portion 31 of the damper mass 3 closer to the first cylindrical portion 21 of the hub 2 . Here, the outer circumferential surface 31c of the mass cylindrical portion 31 extends linearly in the direction of the rotating shaft 10, and the C-shaped ring 5 has at least It surrounds the outer circumferential surface 31c with some parts separated from each other. In the sectional view of FIG. 1, the outer circumferential surface 31c is shown as a straight line extending in the horizontal direction of the figure, and it is also shown that the cross section of the C-shaped ring 5 is spaced apart from the outer circumferential surface 31c. .

FIG. 3 is an enlarged view of the periphery of the C-shaped ring 5 in FIG.

As shown in FIG. 3, a groove portion 23a is formed on the inner circumferential surface of the hub 2 at a position facing the C-shaped ring 5 surrounding the mass cylindrical portion 31 of the damper mass 3. (Please also refer to Figure 1). The C-shaped ring 5 surrounds the outer circumferential surface 31c of the mass cylindrical portion 31 that extends linearly in the direction of the rotating shaft 10, and as shown in FIG. I'm stuck in it.

By fitting into the groove 23a on the inner peripheral surface of the hub 2, the C-shaped ring 5 is positioned in the direction of the rotating shaft 10 in FIG. The presence of the C-shaped ring 5 in this position restricts the displacement of the damper mass 3 from the rotation shaft 10 (the displacement of the damper mass 3 in the direction away from the rotation shaft 10 (direction of centrifugal force)).

In this way, in this embodiment, the displacement of the damper mass 3 from the rotating shaft 10 is regulated by the single C-shaped ring 5 positioned in the direction of the rotating shaft 10, so that the torsional damper 1 with a bending damper shown in FIG. In this case, a member for preventing falling off, such as the cap member 6' of the conventional torsional damper 1' with a bending damper shown in FIG. 4, is unnecessary. As a result, in this embodiment, the damper mass 3 is prevented from being largely displaced in the direction away from the rotating shaft (in the direction of centrifugal force), and damage to the damper rubber 4 is avoided without increasing the number of parts. In particular, since the C-shaped ring 5 is a resin member with a part of the annular shape missing, the diameter can be changed by deformation, and it can be easily placed in the groove 23a.

As described above, in this embodiment, a torsional damper with a bending damper suitable for reducing manufacturing costs is realized.

Here, in the present invention, as shown in FIG. 1, the sleeve 6 is provided with a cylindrical side surface portion 61 that fits inside the second cylindrical portion 22 of the hub 2, and the damper mass is made of the material of the damper rubber 4 before hardening. It is preferable that the damper mass 3 and the damper rubber 4 are arranged inside the hub 2 by press-fitting the damper mass 3 and the damper rubber 4 inside the second cylindrical part 22 of the hub 2 by vulcanizing and adhering the damper mass 3 to the inside of the sleeve 6.

According to such a configuration, the damper mass 3 and the damper rubber 4 can be easily arranged inside the hub 2.

In addition, in the present invention, as shown in FIG. A preferred embodiment further includes a belt-shaped second damper mass 8 that surrounds the hub 2 via two damper rubbers 7.

According to such a configuration, in addition to alleviating vibrations in the bending direction of the rotating shaft 10 of the shaft member (not shown in FIG. 1), it is also possible to alleviate vibrations in the torsional direction of the rotating shaft 10 of the shaft member. can.

The above is the description of this embodiment.

In the sectional view of FIG. 1, the two cross sections of the C-shaped ring 5 located on both sides of the cross section of the damper mass 3 are both separated from the outer peripheral surface 31c of the mass cylindrical portion 31 of the damper mass 3, but in the present invention , at least a portion of the C-shaped ring 5 may be spaced apart, and a portion of the C-shaped ring 5 may be in contact with the outer circumferential surface 31c of the mass cylindrical portion 31.

INDUSTRIAL APPLICATION This invention is useful for reducing the manufacturing cost of a torsional damper with a bending damper.

1: Torsional damper with bending damper,
1': Torsional damper with bending damper,
2: Hub,
2': hub,
3: Dampamas,
3': Dampa mass,
4: Damper rubber,
4': damper rubber,
5: C-shaped ring,
5': Resin stopper,
6: Sleeve,
6': cap member,
7: Second damper rubber,
8: Second damper mass,
10: rotation axis,
21: first cylindrical part,
22: second cylindrical part,
23: Connection part,
23a: groove,
31: Mass cylindrical part,
31a: end,
31b: end,
31c: outer peripheral surface,
32: protrusion,
61: Side part,
100: Crankshaft.

Claims (3)

a first cylindrical part into which an end of a shaft member rotating around a rotational axis is inserted; a second cylindrical part having a cylindrical shape concentric with the first cylindrical part and having a larger inner diameter than the first cylindrical part; , a hub that is a hollow housing having a connecting portion connecting the first cylindrical portion and the second cylindrical portion;
a damper mass disposed inside the hub, the mass cylindrical portion being concentric with the first cylindrical portion and the second cylindrical portion of the hub, and the mass cylindrical portion farther from the first cylindrical portion of the hub; a damper mass having a protrusion protruding from the outer circumferential surface of the mass cylindrical portion at an end of the damper mass;
Inside the hub, it is arranged between the damper mass and the inner circumferential surface of the second cylindrical portion of the hub in a manner surrounding the protrusion of the damper mass, and is far from the first cylindrical portion of the hub. a damper rubber made of a rubber member disposed on an end surface of the damper mass to support the damper mass;
A resin C having a C-shape with a part of the annular shape missing, surrounding the periphery of the mass cylindrical part of the damper mass at the end of the mass cylindrical part of the damper mass closer to the first cylindrical part of the hub. Comprising a letter-shaped ring,
A groove portion is formed on the inner circumferential surface of the hub at a position facing the C-shaped ring surrounding the mass cylindrical portion of the damper mass, and the groove portion extends around the inner circumferential surface of the hub.
The C-shaped ring surrounds the outer circumferential surface of the mass cylindrical portion of the damper mass that extends linearly in the direction of the rotation axis, with at least a portion of the C-shaped ring being spaced apart, and A torsional damper with a bending damper that fits into the groove formed on the inner circumferential surface of the hub. a sleeve having a cylindrical side surface that fits inside the second cylindrical portion of the hub;
The damper mass is vulcanized and bonded to the inside of the sleeve using the material of the damper rubber before hardening, and is press-fitted to the inside of the second cylindrical portion of the hub, so that the damper mass and the damper rubber are attached to the inside of the hub. The torsional damper with a bending damper according to claim 1, wherein the torsional damper has a bending damper. a second damper rubber made of a rubber member disposed on the outer peripheral surface of the hub and surrounding the hub;
The torsional damper with a bending damper according to claim 1, further comprising a belt-shaped second damper mass disposed on the second damper rubber and surrounding the hub via the second damper rubber.

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