JP6591144B2 - Dynamic damper - Google Patents

Description

  The present invention relates to a damper, and more particularly to a dynamic damper that absorbs torsional vibrations generated in a rotary drive system such as a propeller shaft of an internal combustion engine. Dynamic dampers are sometimes called tilgers.

  Conventionally, as shown in FIG. 3, a dynamic damper 51 having a structure in which a vibration ring 54 is connected to an outer peripheral side of a hub 52 via an elastic body 53 made of a rubber-like elastic body is known. In the dynamic damper 51, since the spring constant of the elastic body 53 is usually set low, the vibration ring 54 is not deviated so that the elastic body 53 is not broken by the eccentricity of the vibration ring 54 due to the increase in the rotational speed. A stopper member 55 for restricting the core is attached to the hub 52.

  In the prior art shown in FIG. 3, the stopper member 55 is a separate part from the hub 52 and the vibration ring 54. The function of the stopper member 55 (regulating eccentricity of the vibration ring 54) is controlled by the hub 52 and the vibration ring 54. If the vibration ring 54 is directly applied, the number of parts can be reduced. From this point of view, the configuration of the dynamic damper can be considered as follows.

That is, as shown in FIG. 4 as a comparative example to the present invention, the dynamic damper 1 has a basic structure in which a vibration ring 4 is connected to an outer peripheral side of a hub 2 via an elastic body 3 made of a rubber-like elastic body. . The hub 2 integrally includes an annular hub body 2a fixed to the shaft and an outward flange portion 2b extending radially outward from the hub body 2a. The vibration ring 4 includes an annular vibration ring body 4a connected to the outer peripheral side of the hub body 2a via an elastic body 3, and a cylindrical portion 4b extending from the vibration ring body 4a toward one axial direction. Are integrated. Cylindrical portion 4b is disposed on the outer peripheral side of the outward flange portion 2b, set a small radial clearance c ₀ between the outer peripheral edge portion of the inner peripheral surface of the cylindrical portion 4b and an outward flange portion 2b This is used as a radial stopper 7 for restricting the eccentricity of the vibration ring 4 (when the vibration ring 4 tries to be eccentric, the inner peripheral surface of the cylindrical portion 4b is the outer peripheral end of the outward flange portion 2b. Since it abuts against the eccentricity, it is possible to regulate the eccentricity beyond that).

  According to the damper 1 according to the comparative example of FIG. 4 described above, since the dedicated stopper member is omitted, the number of parts can be reduced.

  However, the damper 1 according to the comparative example of FIG. 4 has the following problems.

That is, since the propeller shaft to which the damper 1 is mounted is attached to the bottom of the vehicle, muddy water is applied when the vehicle is running, and a part of the muddy water flows from the radial gap c ₀ between the cylindrical portion 4b and the outward flange portion 2b to the inside of the damper. Intruding into A, the invading mud is not easily discharged to the outside of the damper B, and the mud after the mud has dried adheres to the surface of the vibration ring 4. Therefore, there is a risk that the target natural frequency of the damper 1 may change, or that the balance state on the circumference may be deteriorated to increase vibration during rotation.

Incidentally, if larger size this amount of the radial clearance c _0, becomes easily discharged invading mud, in this case, functions as the radial stopper portion 7 is that lowered . The technique of FIG. 4 is not known.

Japanese Patent Laid-Open No. 11-166594

  In view of the above, the present invention provides a dynamic damper having a structure that can regulate the eccentricity of the vibration ring without providing a dedicated stopper member and can easily discharge muddy water that has entered the damper to the outside of the damper. The purpose is to do.

  In order to achieve the above object, the dynamic damper of the present invention is a dynamic damper in which a vibration ring is connected to an outer peripheral side of a hub via an elastic body made of a rubber-like elastic body, and the hub is fixed to a shaft. An annular hub body and an outward flange portion extending radially outward from the hub body, and the vibration ring has the elastic body on the outer peripheral side of the hub body. A ring-shaped vibrating ring main body connected via a ring, and a cylindrical portion extending from the vibrating ring main body in one axial direction. The cylindrical portion is an outer periphery of the outward flange portion. A plurality of inwardly projecting stoppers are provided on the circumference on the inner circumferential surface of the cylindrical portion to set a slight radial gap between the outer circumferential end of the outward flange portion, The stopper is provided on the inner peripheral surface of the cylindrical portion. The circumferential upper position other than sites were characterized by tapered surfaces shaped mud discharge surface inner diameter toward the distal end of the tubular portion is inclined in a direction gradually enlarged is provided.

  In the dynamic damper of the present invention having the above-described configuration, an inwardly protruding stopper is provided on the inner peripheral surface of the cylindrical portion of the vibration ring, and the inwardly protruding stopper is an outer peripheral end of the outward flange portion of the hub. Since a slight radial gap is set between the first and second portions, a radial stopper portion for restricting the eccentricity of the vibration ring is provided here.

  Further, since a plurality of inwardly protruding stoppers are provided on the circumference, it is possible to set a relatively large radial gap between the cylindrical portion and the outward flange between adjacent stoppers. Therefore, the muddy water that has entered the damper is easily discharged from the relatively large radial gap to the outside of the damper.

  In addition to this, on the inner peripheral surface of the cylindrical portion between the stoppers adjacent to each other, there is provided a tapered surface-shaped muddy water discharge surface inclined in a direction in which the inner diameter dimension gradually increases toward the distal end portion of the cylindrical portion. Therefore, the muddy water that has entered the inside of the damper is likely to move along the tapered surface-shaped muddy water discharge surface by centrifugal force during rotation, and is thus easily discharged from the tapered surface-shaped muddy water discharge surface to the outside of the damper.

  Therefore, according to the present invention, as described above, the eccentricity of the vibration ring is regulated without providing a dedicated stopper member by the action of the inwardly protruding stopper provided on the inner peripheral surface of the cylindrical portion of the vibration ring. It is possible.

  Further, since a plurality of inwardly protruding stoppers are provided on the circumference, a relatively large radial gap is set between the stoppers adjacent to each other, so that muddy water can be easily discharged. In addition, since the tapered muddy water discharge surface is provided on the inner peripheral surface of the cylindrical portion between the stoppers adjacent to each other, the muddy water can be easily discharged from the tapered muddy water discharge surface. Therefore, it is possible to provide a dynamic damper having a structure in which muddy water entering the damper is easily discharged to the outside of the damper by the action of the relatively large radial gap between the stoppers and the tapered surface-like muddy water discharge surface. .

Sectional drawing of the dynamic damper based on the Example of this invention Perspective view of vibration ring in the same dynamic damper Sectional view of a dynamic damper according to a conventional example Sectional view of dynamic damper according to comparative example

The present invention includes the following embodiments.
(1) The present invention relates to a mud drainage improvement tilger and is used particularly in the field of automobiles.
(2) An object of the present invention is to prevent destruction of a rubber part and accumulation of muddy water due to eccentricity.
(3) As a configuration of the present invention, the dynamic damper used in the propeller shaft is provided with a stopper mechanism that prevents the rubber part from being broken due to the eccentricity of the vibration ring accompanying the increase in the number of rotations, so that the muddy water drainage is improved. In addition, while maintaining a stopper function that prevents displacement of the vibration ring due to centrifugal force, the shape of the muddy water accumulation portion of the vibration ring is tapered.
(4) Since the shape of the vibration ring is partially tapered, even if muddy water adheres to the product, it is discharged out of the product by centrifugal force during use. Muddy water is discharged with a slope.
(5) A protrusion is partially provided to provide a stopper.
(6) By applying the above shape, mud that has been accumulated so far is discharged to the outside along the taper by centrifugal force. Therefore, the natural frequency changes and imbalance due to mud adhering to the vibration ring. The increase in vibration accompanying the increase in quantity can be reduced.
(7) Although the eccentricity of the vibration ring occurs as the number of rotations increases, the eccentricity of the vibration ring is regulated by the convexity of the vibration ring provided partially. Further, even when muddy water enters the Tilger space, the centrifugal force increases due to the increase in the rotational speed, and the muddy water is discharged to the outside along the vibrating ring taper portion.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an overall cross section of a dynamic damper 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the vibration ring 4 provided in the dynamic damper 1 in a single product state.

  The dynamic damper 1 according to this embodiment has a basic structure in which a vibration ring 4 is connected to an outer peripheral side of a hub 2 via an elastic body 3 made of a rubber-like elastic body. The elastic body 3 is vulcanized and bonded to the outer peripheral surface of the sleeve 5 disposed on the inner peripheral side and the inner peripheral surface of the vibration ring 4 disposed on the outer peripheral side, and the sleeve 5 is fitted to the outer peripheral surface of the hub 2. Thus, the hub 2 is connected. Therefore, in this embodiment, the vibration ring 4 is connected to the outer peripheral side of the hub 2 via the sleeve 5 and the elastic body 3.

  The hub 2 has an annular hub body 2a fixed to a shaft, and an outward flange portion 2b is integrally formed from one end portion in the axial direction of the hub body 2a toward the outside in the radial direction.

  The vibration ring 4 has an annular vibration ring main body 4a connected to the outer peripheral side of the hub main body 2a via a sleeve 5 and an elastic body 3, and from the outer peripheral end of the vibration ring main body 4a toward one axial direction. The cylindrical portion 4b is integrally formed. The cylindrical part 4b is arrange | positioned at the outer peripheral side of the outward flange part 2b.

Further, the inner peripheral surface of the cylindrical portion 4b disposed on the outer periphery of the outward flange portion 2b, inward to set a small radial clearance c ₁ between the outer peripheral edge portion of the outward flange portion 2b A plurality of protrusion-like stoppers 4c are provided on the circumference, and in this embodiment, as shown in FIG. 2, the inward-projection stoppers 4c are provided in a uniform manner on the circumference.

  In addition, a tapered surface shape in which the inner diameter dimension is gradually increased toward the distal end portion of the cylindrical portion 4b on the circumferential portion other than the portion where the stopper 4b is provided on the inner peripheral surface of the cylindrical portion 4b. The muddy water discharge surface 4d is provided.

  Furthermore, a thin film-like film portion 6 made of a rubber-like elastic body extends from one end surface of the vibration ring body 4a in the vibration ring 4 in the axial direction to the inner peripheral surface of the cylindrical portion 4b and the inner peripheral surface of the stopper 4c. The coating 6 is formed integrally with the elastic body 3, and the hub 2 and the vibration ring 4 are prevented from coming into metal contact with each other.

In the dynamic damper 1 having the above-described configuration, an inwardly protruding stopper 4c is provided on the inner peripheral surface of the cylindrical portion 4b of the vibration ring 4, and the inwardly protruding stopper 4c is the outward flange portion of the hub 2. Since a slight radial gap c ₁ is set between the outer peripheral end of 2 b, a radial stopper 7 for restricting the eccentricity of the vibration ring 4 is provided here. Therefore, first, the eccentricity of the vibration ring 4 can be regulated by the action of the stopper 4c or the stopper portion 7 without providing a dedicated stopper member.

Further, since the inward protruding stopper 4c is provided with a plurality circumferentially relatively large set diametrical gap c ₂ between the cylindrical portion 4b and the outward flange portion 2b between the stopper 4c adjacent to each other Has been. Therefore, even if muddy water intrusion into the relatively large radial clearance c ₂ from the damper inside A, easily discharged invading mud from the relatively large radial clearance c ₂ to damper outside B.

  Further, in addition to this, the tapered surface-shaped muddy water discharge is inclined on the inner peripheral surface of the cylindrical portion 4b between the stoppers 4c adjacent to each other in a direction in which the inner diameter dimension gradually increases toward the tip end portion of the cylindrical portion 4b. Since the surface 4d is provided, the muddy water that has entered the damper inside A is easily moved along the tapered surface-like muddy water discharge surface 4d by the centrifugal force during rotation, and the damper is released from the tapered surface-shaped muddy water discharge surface 4d. Easily discharged to outside B.

Accordingly, the dynamic damper 1 having a structure in which the muddy water entering the damper inside A is easily discharged to the damper outer B by the action of the relatively large radial gap c ₂ between the stoppers 4c and the tapered muddy water discharge surface 4d is provided. It is possible to do.

DESCRIPTION OF SYMBOLS 1 Dynamic damper 2 Hub 2a Hub main body 2b Outward flange part 3 Elastic body 4 Vibration ring 4a Vibration ring main body 4b Cylindrical part 4c Stopper 4d Muddy water discharge surface 5 Sleeve 6 Film part 7 Radial direction stopper part

Claims (1)

A dynamic damper formed by connecting a vibration ring to an outer peripheral side of a hub via an elastic body made of a rubber-like elastic body,
The hub integrally includes an annular hub body fixed to a shaft and an outward flange portion extending radially outward from the hub body,
The vibration ring integrally includes an annular vibration ring main body connected to the outer peripheral side of the hub main body via the elastic body, and a cylindrical portion extending from the vibration ring main body in one axial direction. Have
The cylindrical portion is disposed on the outer peripheral side of the outward flange portion, and an inner diameter is set between the outer peripheral end portion of the outward flange portion on the inner peripheral surface of the cylindrical portion. A plurality of direction-protruding stoppers are provided on the circumference,
A tapered surface-shaped muddy water discharge that is inclined in a direction in which the inner diameter dimension gradually increases toward the distal end portion of the cylindrical portion on a circumferential portion other than the portion provided with the stopper on the inner peripheral surface of the cylindrical portion. A dynamic damper characterized in that a surface is provided.

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