JPH056436Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dynamic vibration absorber that damps vibrations generated in various rotary drive systems.

[Conventional technology]

Conventionally, as a type of vibration absorber that absorbs vibrations generated in the drive system of an automobile, as shown in FIG.
It is known that a vibrating ring b is arranged concentrically and spaced apart on the outer periphery of a cylindrical portion of the hub a, and the hub a and the vibrating ring b are connected by a rubber member c. Rubber member c has
In addition to the portion c1 that connects the hub a and the vibration ring b, projecting portions c2 are integrally molded on the outer circumferential side of the hub a in an alternating and evenly spaced manner.

The above-mentioned vibration absorber absorbs vibrations in the torsional direction (rotational direction) that are generated in the propeller shaft of an automobile drive system by fitting a hub a to the propeller shaft of the vehicle, etc. Due to the action of force, the vibration ring b becomes largely eccentric with respect to the hub a, that is, the center of rotation, in a certain rotational speed range, resulting in the problem of generating new vibrations and noise.

Therefore, as shown in Fig. 3, a configuration is adopted in which a rolling bearing d, such as a ball or roller, which has sufficient rigidity to suppress the mutual eccentricity of both a and b is interposed between the hub a and the vibration ring b. As shown in FIG. 4, a bearing mechanism has been proposed so that a corner e formed on a hub a slides on the inner circumferential surface of a vibration ring b.

[Problem that the invention attempts to solve]

However, these dynamic vibration absorbers with the configurations shown in Figures 3 and 4 all have rolling bearings d and corners e.
It is difficult to maintain lubrication in these parts, and it is also impossible to prevent foreign substances such as dust and muddy water from entering these parts, resulting in problems such as seizure and malfunction.

In view of these problems, the present invention aims to maintain good performance over a long period of time in a dynamic vibration absorber having a bearing mechanism that suppresses mutual eccentricity between the hub and the vibration ring.

[Means for solving problems]

In order to achieve the above object, the dynamic vibration absorber of the present invention includes a bearing mechanism interposed between a hub and a vibration ring disposed on the outer circumferential side of the hub, and the hub and the vibration ring are connected to the axis of the bearing mechanism. The rubber bushings are connected to each other via rubber bushings on both sides in the direction, and the rubber bushings are characterized in that a plurality of thin-walled parts arranged in the circumferential direction are formed on an annular rubber.

[Effect]

According to the configuration of the present invention, the bearing mechanism is located in an airtight chamber surrounded by the hub, the vibrating ring, and a pair of rubber bushes in the axial direction, and the surroundings are completely sealed, so that oils and fats for lubricating the bearing mechanism cannot be used. It is possible to prevent spillage and foreign matter from entering the bearing mechanism. The rubber bushing is made by forming a plurality of thin-walled parts arranged in the circumferential direction on an annular rubber, and the parts other than the thin-walled parts exhibit the same vibration-absorbing effect as conventional ones, and the thin-walled parts exhibit a sealing effect.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A dynamic vibration absorber according to the present invention will be explained below based on illustrated embodiments.

As shown in FIG. 1, a vibration ring 2 is disposed on the outer peripheral side of a hub 1, and a bearing mechanism 5 is interposed between the hub 1 and the vibration ring 2 to keep both members 1 and 2 concentric. Although the bearing mechanism 5 is a resin sliding bearing, it may be another sliding bearing or a rolling bearing. The hub 1 and the vibrating ring 2 are connected via rubber bushings 3 on both sides of the bearing mechanism 5 in the axial direction, and an airtight chamber 4 is surrounded by the hub 1, the vibrating ring 2, and the pair of rubber bushings 3 in the axial direction.
is formed, and a bearing mechanism 5 is disposed inside this airtight chamber 4 to prevent the lubricant that lubricates the sliding parts between the bearing mechanism 5 and the hub 1 or the vibration ring 2 from leaking to the outside. Prevents external foreign matter from entering the sliding part. The rubber bush 3 has annular sleeves 3b, 3 on the inner and outer peripheries of the annular rubber 3a, respectively.
c is vulcanized and bonded and press-fitted between the hub 1 and the vibration ring 2, and furthermore, a plurality of thin portions 3a' aligned in the circumferential direction are formed on the annular rubber 3a at equal intervals. The annular rubber 3a reduces the dynamic spring constant by forming the thin wall portion 3a', and it is preferable that the thin wall portion 3a'
By making a' so thin that it does not affect the spring constant, the thin wall portion 3a' only performs a sealing action. In this way, the above-mentioned sealing effect can be added to the conventional technology without changing the vibration absorption characteristics of the rubber.

[Effect of idea]

As explained above, the dynamic vibration absorber of the present invention is
The bearing mechanism that suppresses eccentric movement between the hub and the vibrating ring is located in an airtight chamber that is sealed between the hub and the vibrating ring, which prevents lubricating oils and fats from flowing away and foreign substances such as muddy water from entering. This eliminates problems such as seizure and malfunction, allowing stable performance to be maintained over a long period of time. Further, since the above-mentioned sealing effect is obtained by forming a thin wall portion in the annular rubber of the rubber bushing, by molding this thin wall portion as thin as possible, it is not necessary to change the vibration absorption characteristics of the rubber compared to the prior art.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of a dynamic vibration absorber according to an embodiment of the present invention, and FIGS. 2 to 4 are half-cut front views of conventional dynamic vibration absorbers. 1...Hub, 2...Vibration ring, 3...Rubber bushing, 3a...Annular rubber, 3a'...Thin wall part, 3
b, 3c... Sleeve, 4... Airtight chamber, 5... Bearing mechanism.

Claims (1)

[Scope of utility model registration request] A bearing mechanism 5 is interposed between a hub 1 and a vibrating ring 2 disposed on the outer peripheral side of the hub 1, and the hub 1 and the vibrating ring 2 are connected to each other via rubber bushings 3 on both sides of the bearing mechanism 5 in the axial direction. A dynamic vibration absorber characterized in that the rubber bush 3 is formed by forming a plurality of thin-walled parts 3a' arranged in the circumferential direction on an annular rubber 3a.