JP2007177830A - Dynamic damper and hollow propeller with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamic damper having high shaft perpendicular spring characteristics regardless of the diameter size of a hollow propeller shaft, providing resonance characteristics from a low frequency region to a high frequency region, reducing cost by reducing metal portions, and easily fitted. <P>SOLUTION: This dynamic damper is provided with: a damper mass 3 loosely fitted into the hollow shaft 2; fitting members 4, 5 positioned in both end sides of the damper mass 3 and fixed inside the hollow shaft 2 by compression; and connection members 7, 8 elastically connecting the damper mass 3 to the fitting members 4, 5 in the both sides so as to have the same axis 6 and inclined to the same axis 6. Due to this configuration, roles of the fitting members 4, 5 and the connection members 7, 8 are separated, and in the connection members 7, 8, a shearing component and a compression component become dominant. If the mass and rigidity of the connection members 7, 8 are adjusted, resonance characteristics are provided in a wide range of frequency while high shaft perpendicular spring characteristics are maintained. This promotes cost reduction and also facilitates manufacturing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a dynamic damper and a hollow propeller shaft equipped with the dynamic damper for improving the quietness during driving of a vehicle, and more specifically, connecting members having inclined end portions of a damper mass loosely fitted in the hollow shaft. The present invention relates to a dynamic damper which can be appropriately coped with by low-cost and vehicle running characteristics by being connected to a mounting member fixed in the hollow shaft, and a hollow propeller shaft on which the dynamic damper is mounted.

The dynamic damper is installed in the hollow propeller shaft that is used to transmit the driving force of the car, preventing vibration of the car body and improving the quietness when driving the car, and in addition to metal fatigue caused by vibration of the hollow propeller shaft itself. This is for preventing the accompanying strength reduction and enhancing its durability. As shown in FIG. 9, the dynamic damper for the hollow propeller shaft is usually composed of an outer pipe 50 having a rubber 53 attached to the outer peripheral surface, a damper mass 51 disposed on the axial center of the outer pipe 50, and the damper. Mass 51 and outer pipe 50
And at least a mount rubber 52 that elastically connects the two. This dynamic damper is installed in the hollow propeller shaft and absorbs vibrations generated when the hollow propeller shaft rotates to prevent vibrations, thereby eliminating vibrations of the hollow propeller shaft.

However, if the hollow propeller shaft is reduced in diameter from the viewpoint of energy saving, the distance between the damper mass 51 and the outer pipe 50 is inevitably shortened, and the width of the mount rubber 52 that connects them is also narrowed. Therefore, when the dynamic damper is removed from the mold during the manufacturing process, the mount rubber 52 is easily damaged, and it is difficult to expect durability.
The following techniques are known to deal with such a situation.
JP 2003-294025 A Japanese Patent No. 2599059 JP 2003-262252 A JP 2005-256998 A

As shown in FIG. 10, the dynamic damper of Patent Document 1 covers both ends of a damper mass 51a with mount rubbers 52A. The mount rubber 52A has a large-diameter portion 52a that is fixed in the hollow propeller shaft 58, and a large-diameter portion 52a. The small-diameter portion 52b is formed integrally with the diameter portion 52a and is held in contact with the end portion of the damper mass 51a. As a result, the dynamic damper can be fixed in the hollow propeller shaft 58 by the large diameter portion 52a, the outer pipe 50 is not necessary, the hollow propeller shaft 58 can cope with a small diameter, and durability can be expected.

As shown in FIG. 11, the dynamic damper of Patent Document 2 is provided with mount rubbers 52B at both ends of a damper mass 51b.
To fix in the hollow propeller shaft 58. As a result, the hollow propeller shaft 58
The dynamic damper can be fixed inside by the fixing auxiliary ring 54, and the outer pipe 50
Is no longer necessary, and the hollow propeller shaft 58 can cope with a small diameter, and durability can be expected.

As shown in FIG. 12, the dynamic damper of Patent Document 3 is provided with a mount rubber 52C at one end of a damper mass 51c. The mount rubber 52C is connected to the radial surface 55a of the fixing ring 55, and the fixing ring 55 To fix in the hollow propeller shaft 58. As a result, the dynamic damper can be fixed in the hollow propeller shaft 58 by the fixing ring 55, and the hollow propeller shaft 58 can cope with a small diameter, and durability can be expected.

As shown in FIG. 13, the dynamic damper of Patent Document 4 includes mount rubbers 52D disposed on both ends in the axial direction of the damper mass 51d. The mount rubber 52D includes a rod-shaped connection portion 56, a disk-shaped support portion 57, and the like. The connecting portion 56 is connected to both end surfaces of the damper mass 51d in the axial direction, and the support portion 57 is connected to the inner peripheral surface of the outer pipe 50a that is largely cut out, and a rubber 53a provided on the outer peripheral surface of the outer pipe 50a. By hollow propeller shaft 58
Secure inside. As a result, the dynamic damper can be fixed in the hollow propeller shaft 58 by the rubber 53a on the outer peripheral surface of the outer pipe 50a, and the hollow propeller shaft 58 can cope with a small diameter, and durability can be expected.

In the device described in Patent Document 1, since the portion where the mount rubber 52A is fixed in the hollow propeller shaft 58 and the portion exhibiting the resonance characteristics are integrated, this mount rubber 52A.
Is pressed into the hollow propeller shaft 58, a compression component is produced, the resonance frequency is increased, and it is difficult to obtain resonance characteristics in a low frequency range. Further, in order to obtain resonance characteristics in a low frequency range, it is necessary to lower the rigidity of the mount rubber 52A, but there is a limit to the material, which is difficult to realize at present.

The one described in Patent Document 2 requires a separate fixing auxiliary ring 54 for fixing in the hollow propeller shaft 58, which causes an increase in cost.

The one described in Patent Document 3 also requires a separate fixing ring 55 to be fixed in the hollow propeller shaft 58, resulting in an increase in cost. In addition, the damper mass 51c has a cantilever structure. Elimination of ingredients becomes a problem.

In Patent Document 4, since the damper mass 51d is held only by the both end surfaces in the axial direction by the mount rubber 52D, the shear component and the bending component of the mount rubber 52D are involved, and a high axial right angle spring is involved. It is difficult to obtain characteristics and resonance characteristics in a high frequency range.
Furthermore, although the thing of the patent document 4 requires the outer pipe 50a although it is notched greatly, it becomes a factor of cost increase, In addition, the mounting rubber 52D is attached to the hollow propeller shaft 5.
When press-fitting into 8, the disc-shaped support part 57 may fall down.

Therefore, an object of the present invention is to obtain a resonance characteristic from a low frequency range to a high frequency range while having a high axis right angle spring characteristic regardless of the diameter of the hollow propeller shaft. Another object of the present invention is to provide a dynamic damper that reduces the cost by eliminating metal parts other than the above and can be easily mounted on a hollow propeller shaft.

The present invention has been proposed in order to achieve the above object, and is characterized by having the following configuration.
That is, according to the present invention, the damper mass loosely fitted in the hollow shaft, the mounting members positioned at both ends of the damper mass and fixed in the hollow rubber shaft, the damper masses on the mounting members on both sides, There is provided a dynamic damper characterized by comprising a connecting member that is elastically connected to each other on the same axis and is inclined with respect to the same axis.

According to the present invention, there is provided a dynamic damper in which the inclination of the connecting member with respect to the axis is in a range of 45 ± 20 degrees.

In addition, according to the present invention, there is provided the dynamic damper in which one of the mounting members has a diameter smaller than that of the other mounting member.

Further, according to the present invention, there is provided the above-described dynamic damper in which three or more notches extending in the axial direction at equal intervals on the circumference are formed on the contact surface of the mounting member with the hollow shaft.

According to the present invention, a stopper made of an elastic material is provided on the outer peripheral surface of the damper mass so that the stopper does not function within the normal rotation range of the hollow shaft, and the stopper is not used when the normal rotation range is exceeded. A dynamic damper designed to function is provided.

Further, according to the present invention, the hollow shaft located between the inner ends of the mounting members on both sides of the dynamic damper described above is provided with an uneven portion, and the uneven portion is inserted into the hollow shaft. A hollow propeller shaft is provided which is characterized in that the positioning is performed.

According to the present invention, the hollow shaft located between the outer ends of the mounting members on both sides of the dynamic damper described above is provided with a compression uneven portion shorter than the distance L between the outer ends of the mounting members, When the dynamic damper is inserted into the hollow shaft, there is provided a hollow propeller shaft characterized in that a connecting member inclined with respect to the same axis is compressed by the compression uneven portion.

In the dynamic damper of the present invention, since the damper mass loosely fitted in the hollow shaft is connected to the mounting member by a connecting member formed by inclining, the connecting member has a dominant shear component and compressive component, and this connection By adjusting the mass and rigidity of the member, it is possible to obtain a resonance characteristic in a wide range from a low frequency to a high frequency while maintaining a high axis perpendicular spring characteristic. On the other hand, regardless of the connecting member, it is compressed and fixed in the hollow shaft by the mounting member. Therefore, regardless of the diameter of the hollow shaft of the hollow propeller shaft, structurally, the connecting member and the mounting member are not damaged and the durability can be maintained. In addition, it is possible to obtain resonance characteristics in the region, and furthermore, since metal portions other than the damper mass can be eliminated, the cost can be reduced and the mounting to the hollow shaft is facilitated.

In addition, the shearing component and the compression component are definitely dominant in the connecting member, and the above-described effect is further ensured.

Further, a notch extending in the axial direction at equal intervals on the circumference is formed on the contact surface of the mounting member with the inner diameter of the hollow shaft of the mounting member so that one of the mounting members has a smaller diameter than the other. By forming three or more locations, the mounting member can be mounted on the hollow shaft more smoothly.

Further, when the hollow shaft of the hollow propeller shaft exceeds the normal rotation range and the amplitude becomes abnormally large, the stopper made of an elastic material functions to hit the inner wall of the hollow shaft and the connecting member is not further deformed. Therefore, in addition to the above effects, while maintaining the anti-vibration function in the direction perpendicular to the axis in the normal rotation range of the engine, the anti-vibration function is also achieved even if the acceleration greatly increases and greatly exceeds the normal rotation range. Therefore, it has sufficient durability. Moreover,
Manufacture is easy because only a stopper is provided.

Further, when the dynamic damper is inserted into the hollow shaft of the hollow propeller shaft, the insertion position is determined by the concavo-convex portion, so that in addition to the above effects, the operation of mounting the dynamic damper on the hollow shaft becomes extremely easy.

Further, when the dynamic damper is inserted into the hollow shaft of the hollow propeller shaft, the connecting member, particularly the connecting member, is compressed by the compression uneven portion.
Therefore, in addition to the above effects, the durability of the dynamic damper can be improved by this compression.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

<Example 1>
FIG. 1 is a cross-sectional view showing a dynamic damper of the present invention, FIG. 2 is a cross-sectional view showing an operation state of mounting the dynamic damper of the present invention in a hollow propeller shaft, and FIG. 3 is a cross-sectional view of the dynamic damper of the present invention in the hollow propeller shaft. It is sectional drawing which shows the mounted state.
In these drawings, a dynamic damper 1 according to the present invention includes a damper mass 3 that is loosely fitted in a hollow shaft 2 of a hollow propeller shaft, and an attachment that is positioned at both ends of the damper mass 3 and is fixed to the hollow rashaft 2 by compression. Members 4 and 5 and mounting members 4 and 5 on both sides
Further, the damper mass 3 is elastically connected to each other so as to be on the same axis 6, and has at least connecting members 7 and 8 that are inclined with respect to the same axis 6.

Since the damper mass 3 requires a certain amount of weight, cast iron and steel are often used for economy. The mounting members 4 and 5 and the connecting members 7 and 8 are made of SBR (styrene-butadiene copolymer synthetic rubber) which is an elastic body, natural rubber, or a mixture thereof.
However, unlike the mounting rubber 52 of the prior art, the mounting members 4 and 5 correspond to the outer pipe 50 to which the rubber 53 is attached, and the connecting members 7 and 8 correspond to the mounting rubber 52.
Can say

In this embodiment, the damper mass 3 has a disk shape, but is not limited to this, and changes depending on the diameter and shape of the hollow shaft 2 as described later. A stopper 10 made of an elastic material is provided on the outer peripheral surface of the damper mass 3, and the stopper 10 does not function in the normal rotation region of the hollow shaft 2, and is made of an elastic material when the normal rotation region is exceeded. When the connecting members 7 and 8 are distorted and the stopper 10 hits the inner wall of the hollow shaft 2, further distortion of the connecting members 7 and 8 is restricted, and the stopper 10 functions.

The mounting members 4 and 5 have a circular disk shape in which a hole 12 is formed in the disk 11 and play a role of mounting the dynamic damper 1 in the hollow shaft 2. That is, the disk 1 of the mounting members 4 and 5
Since the outer diameter of 1 is slightly larger than the inner diameter of the hollow shaft 2 and the mounting members 4 and 5 are press-fitted into the hollow shaft 2 to be firmly compressed and fixed.
Has little effect on In addition, the peripheral part of the disk 11 of the mounting members 4 and 5 is cut so that the dynamic damper 1 can be easily press-fitted into the hollow shaft 2.

The connecting members 7 and 8 connect the damper mass 3 and the mounting members 4 and 5 and are integrally formed with the mounting members 4 and 5 in this embodiment. That is, the disk 1 of the mounting members 4 and 5
One side surface of 1 and both side planes of the damper mass 3 are connected by connecting members 7 and 8 having an inclined continuous wall shape, in other words, umbrella shapes. Accordingly, the connecting members 7 and 8 are dominated by the shear component and the compression component, and by adjusting the length, angle, and rigidity of the connecting members 7 and 8, while maintaining high axial right-angle spring characteristics, Resonance characteristics in a wide range of high frequencies can be obtained. As described above, since the mounting members 4 and 5 hardly affect the connection members 7 and 8 with respect to the mounting, the above characteristics of the connection members 7 and 8 can be obtained without being affected by the mounting members 4 and 5. .
Further, since the connecting members 7 and 8 are inclined in a continuous wall shape, in other words, an umbrella shape, it contributes to preventing the disk-shaped mounting members 4 and 5 from falling when mounted in the hollow shaft 2. Yes.

The inclination angle α of the connecting members 7 and 8 with respect to the same axis 6 is in the range of 45 ± 20 degrees. In the connecting members 7 and 8 within the range of the inclination angle α, the shear component and the compression component are surely dominant, and the resonance characteristics in a wide range from a low frequency to a high frequency while maintaining a high axis perpendicular spring characteristic. Can be put out reliably. On the other hand, when the inclination angle α is smaller than 25 degrees, the shear component and the bending component become mainstream, and high axial right-angle spring characteristics cannot be maintained, and only low-frequency resonance characteristics can be obtained. On the other hand, when the inclination angle α is larger than 65 degrees, the compression component becomes mainstream, and high axial right-angle spring characteristics can be obtained, but only high-frequency resonance characteristics can be obtained. For the above reasons, the inclination angle α with respect to the same axis 6 is set to 45.
Although defined as ± 20 degrees, the more preferable inclination angle α is in the range of 45 ± 10 degrees.

The dynamic damper 1 having the above configuration includes a damper mass 3, mounting members 4 and 5, and a connecting member 7.
, 8 and the stopper 10 are integrally formed so as to be on the same shaft 6. The mounting member 4,
5. If the connecting members 7 and 8 and the stopper 10 are made of the same rubber material, they can be manufactured at once by injection molding using a mold. This manufactured dynamic damper 1 is shown in FIG.
As shown in FIG. 3, it is used by being press-fitted into the hollow shaft 2, and it is important to match the same axis 6 of the dynamic damper 1 and the axis 13 of the hollow shaft 2 also at this time.

And even if it is the dynamic damper 1 of such a structure, as shown in FIG. 4, the frequency range which can anticipate the effective vibration absorption effect can be obtained, and the length, angle, and rigidity of the connection members 7 and 8 can be obtained. If adjusted, this frequency range can be moved left and right in the horizontal axis direction while maintaining a high axis right-angle spring characteristic, and resonance characteristics in a wide range from low frequency to high frequency can be obtained.

Next, the operation of the dynamic damper 1 configured as described above will be described.
First, the dynamic damper 1 that matches the diameter and the rotational speed of the hollow shaft 2 of the hollow propeller shaft is selected, and the dynamic damper 1 is press-fitted into the hollow shaft 2 and attached. At this time, the same shaft 6 of the dynamic damper 1 and the shaft 13 of the hollow shaft 2 are made to coincide with each other in the mounted state. In the dynamic damper 1, the mounting members 4, 5 are compressed and fixed in the hollow propeller shaft 2 regardless of the connecting members 7, 8, so that the connecting members 7, 8 are dominated by shear components and compression components. As a result, it is possible to obtain resonance characteristics in a wide range from low frequencies to high frequencies while maintaining high axis right-angle spring characteristics, and the degree of freedom in design is significantly increased. Moreover, even if the diameter of the hollow propeller shaft is reduced, the connection member and mounting member are not structurally damaged, so durability can be maintained, metal parts other than the damper mass can be eliminated, and low cost can be achieved. It becomes possible.

Next, if the dynamic damper having the above configuration is slightly displaced from the axis of the hollow propeller shaft, a centrifugal force acts as the hollow propeller shaft rotates. If the hollow propeller shaft rotates and it is in the normal rotation range, for example 5000 rpm,
8, the stopper 10 on the damper mass 3 does not hit the inner wall of the hollow shaft 2, and the quietness of the hollow propeller shaft is maintained. On the other hand, when the rotation of the hollow propeller shaft exceeds the normal rotation range, for example, 7000 rpm, the distortion of the connecting members 7 and 8 increases, the stopper 10 hits the inner wall of the hollow shaft 2, and the distortion of the coupling members 7 and 8 occurs. It doesn't go any further, ensuring durability and keeping the quietness of the hollow propeller shaft.

FIG. 5 shows the shape of the hollow shaft 2 in the hollow propeller shaft, and the shape is located between the inner ends of the mounting members 4 and 5 on both sides when the dynamic damper 1 is mounted on the hollow shaft 2. The concave / convex portion 14 is provided in advance in the hollow shaft 2 to be used, and the concave / convex portion 14 is positioned when the dynamic damper 1 is press-fitted into the hollow shaft 2. Thereby, when the dynamic damper 1 is press-fitted into the hollow shaft 2, the press-fitting position can be determined by the concavo-convex portion 14, and the mounting operation becomes extremely easy.

FIG. 6 shows another shape of the hollow shaft 2, and this shape is located between the outer ends of the mounting members 4 and 5 on both sides when the dynamic damper 1 is mounted on the hollow shaft 2. When the compression uneven portion 15 that is shorter than the distance L between the outer end portions of the mounting members 4 and 5 is provided in advance in the hollow shaft 2, and the dynamic damper 1 is press-fitted into the hollow shaft 2,
The dynamic damper 1 is compressed by the compression uneven portion 15. This
Among the mounting members 4 and 5 and the connecting members 7 and 8, particularly the connecting members 7 and 8 are compressed,
The durability of the dynamic damper 1 can be improved.

<Example 2>
FIG. 7 shows another dynamic damper 1a of the present invention, and this dynamic damper 1a.
1 to 4 is a rugby ball-shaped damper mass 3a, and the end surfaces of the connecting members 7a and 8a on the damper mass 3a side are curved. is there. In the figure, the symbol A indicates the angle between the connecting member and the shaft. Since other configurations and operations are the same as those of the dynamic damper 1 shown in FIGS. 1 to 4, the reference numerals are assigned to the drawings and the description thereof is omitted.

<Example 3>
FIG. 8 shows another dynamic damper 1b of the present invention, and this dynamic damper 1b.
1 to FIG. 4 is different from the dynamic damper 1 shown in FIG.
Accordingly, the end surface shape of the connecting members 7b and 8b on the damper mass 3b side is a curved surface along the side surface of the damper mass 3b, and is further connected to the stopper 10a. In the figure, the symbol B indicates the angle between the connecting member and the shaft. Other configurations and operations are shown in FIGS.
Therefore, the reference numeral is attached to the drawing and the description thereof is omitted.

<Example 4>
FIG. 9 shows another dynamic damper 1c of the present invention, and this dynamic damper 1c.
1 to 4 is different from the dynamic damper 1 shown in FIGS. 1 to 4 in that one wheel diameter a of the mounting member 4 (5) is smaller than the wheel diameter b of the other mounting member 5 (4). It is in. Thus, by making the ring diameter of one mounting member smaller than the ring diameter of the other mounting member,
If it is mounted on the hollow shaft from the side of the mounting member having the smaller diameter, mounting in the hollow shaft is facilitated and workability is improved. In addition, the ring diameter a of the mounting member 5 (4) having a small diameter is
Even if the ring diameter b of the mounting member 4 (5) is made larger than the inner diameter of the hollow shaft, the elasticity of rubber or the action of oil applied to the outer peripheral surface of the mounting member, The dynamic damper 1c is mounted in a compressed state in the hollow shaft.

<Example 5>
FIG. 10 shows another dynamic damper 1d of the present invention.
1 is different from the dynamic damper 1 shown in FIGS. 1 to 4 in that there are three or more notches 9 extending axially at equal intervals on the contact surface of the mounting members 4 and 5 with the hollow shaft. It is to be formed. The notch 9 of the dynamic damper 1d also contributes to the improvement of the mounting property to the hollow shaft. Due to the notch, the outer periphery of the mounting member of the dynamic damper and the inner periphery of the hollow shaft at the time of mounting are provided. The contact area is reduced and workability at the time of mounting can be improved. It is important for the notch formation to extend in the axial direction at equal intervals on the circumference of the contact surface, and the number varies depending on the size of the dynamic damper and the width and depth of the notch. It is preferable that three or more locations are formed at equal intervals on the circumference.
However, for example, if there are too many notches such as 20 or more, the compressive force with the mounting member is weakened, so the range in which the compressive force with the mounting member does not weaken, specifically, 3 or more and within 20 locations. A suitable number may be appropriately selected within the range.

As mentioned above, although Embodiment 1 thru | or 3 of this invention was demonstrated, it should be understood that a specific structure is not limited to this and the change in the range which does not deviate from the summary of this invention is possible suitably. .

The dynamic damper of the present invention is highly applicable when it is desired to obtain resonance characteristics in a high frequency range from a low frequency range while having a high axis right angle spring characteristic regardless of the diameter of the hollow propeller shaft. Especially when the diameter of the hollow propeller shaft is small and rotating at high speed,
The availability becomes extremely high.

It is sectional drawing which shows the dynamic damper of Example 1 of this invention. It is sectional drawing which shows the operation state which mounts the dynamic damper of Example 1 in a hollow propeller shaft. It is sectional drawing sectional drawing which shows the state which mounted | wore the hollow propeller shaft with the dynamic damper of Example 1. FIG. It is a characteristic view of the frequency and resonance magnification of the dynamic damper of Example 1. It is sectional drawing of the state which mounted | wore the hollow propeller shaft of the special shape with the dynamic damper of Example 1. FIG. It is sectional drawing of the state which mounted | wore the hollow propeller shaft of the special shape with the dynamic damper of Example 1. FIG. It is sectional drawing which shows the dynamic damper of Example 2 of this invention. It is sectional drawing which shows the dynamic damper of Example 3 of this invention. It is sectional drawing which shows the dynamic damper of Example 4 of this invention. It is a perspective view which shows the dynamic damper of Example 5 of this invention. It is a perspective view which shows the example of the dynamic damper of a prior art example. It is sectional drawing which shows the example of the dynamic damper of a prior art example. It is sectional drawing which shows the example of the dynamic damper of a prior art example. It is sectional drawing which shows the example of the dynamic damper of a prior art example. It is sectional drawing which shows the example of the dynamic damper of a prior art example.

Explanation of symbols

1, 1a, 1b, 1c, 1d: Dynamic damper
2: Hollow shaft 3, 3a, 3b, 51, 51a, 51b, 51c: Damper mass
4, 5: Mounting member 6: Same shaft 7, 7a, 7b, 8, 8a, 8b: Connecting member
9: Notch 10, 10a: Stopper 11: Disk 12: Hole 13: Shaft 14: Concavity and convexity 15: Compression concavity and convexity 50, 52a: Outer pipe 52, 52A, 52B, 52C, 52D: Mount rubber
52a: Large diameter portion 52b: Small diameter portion 53, 53a: Rubber 54: Fixing auxiliary ring 55: Fixing ring 55a: Radial surface 56: Connection portion 57: Support portion 58: Hollow propeller shaft A, B: Connecting member and shaft Angle α: Angle of inclination between connecting member and shaft

Claims (7)

A damper mass loosely fitted in the hollow shaft, a mounting member positioned at both ends of the damper mass and fixed by compression in the hollow shaft, and the damper masses on both mounting members elastically and coaxially with each other The dynamic damper comprises a connecting member that is connected so as to be inclined and inclined with respect to the same axis. The dynamic damper according to claim 1, wherein an inclination of the connecting member with respect to the same axis is in a range of 45 ± 20 degrees. The dynamic damper according to claim 1 or 2, wherein one of the mounting members has a diameter smaller than that of the other mounting member. The dynamic damper according to any one of claims 1 to 3, wherein three or more cutouts extending in the axial direction at equal circumferential intervals are formed on a contact surface of the mounting member with the hollow shaft. A stopper made of an elastic material is provided on the outer peripheral surface of the damper mass so that the stopper does not function within the normal rotation range of the hollow shaft, and the stopper functions when the normal rotation range is exceeded. 5. The dynamic damper according to any one of items 4 to 4. An uneven portion is provided on the hollow shaft located between the inner ends of the mounting members on both sides of the dynamic damper according to any one of claims 1 to 5, and the uneven portion is provided on the hollow shaft. A hollow propeller shaft characterized by positioning when a damper is inserted. A compression uneven portion shorter than the distance L between the outer end portions of the mounting member is formed on the hollow shaft positioned between the outer end portions of the mounting member on both sides of the dynamic damper according to any one of claims 1 to 5. A hollow propeller shaft, characterized in that, when the dynamic damper is inserted into the hollow shaft, a connecting member inclined with respect to the same axis is compressed by the compression uneven portion.

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