JPH0219616Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a damping mechanism for suppressing the amplitude at the resonance point of a rotating shaft joint.

[Conventional technology]

Conventionally, as a rotary shaft joint that flexibly connects opposing rotary shafts via a joint pipe and diaphragms provided at both ends of the joint pipe, a rotary shaft joint is fixed to the shaft end of a rotary shaft 50, as shown in FIG. A guard member 54 for protecting the outer surface of the diaphragm 53 whose inner diameter is fixed to the outer circumferential surface of the end of the joint tube 52 is attached to the outer circumference of the hub 51.
In other words, this rotary shaft joint absorbs vibrations in the axial direction of the rotary shaft 50 by the flexure of the diaphragm 53, and also fastens and secures the rotary shaft 50 with a bolt 55 and a nut 56. If there is a relative misalignment between the axes of the other rotating shaft (not shown), the joint pipe 52
The diaphragm 53 rotates with an angular displacement, and the diaphragm 53 is deflected accordingly to absorb the misalignment.

[The problem that the idea attempts to solve]

However, in the conventional rotary shaft joint, the rotary shaft 50
When the input frequency in the axial direction from the joint pipe 52 matches the natural frequency in the axial direction of the joint due to the inertial mass of the joint pipe 52 and the spring constant of the diaphragm 53, a resonance phenomenon occurs and the amplitude in the axial direction of the joint pipe 52 decreases. Because it becomes extremely large and causes destruction of the diaphragm 53,
It is necessary to adjust the natural frequency and prevent resonance by changing the thickness of the diaphragm 53 to increase or decrease the spring constant or by increasing or decreasing the weight of the joint tube 52. As a result, problems such as an increase in the weight and size of the rotary shaft joint as a whole, or a decrease in the amount of permissible misalignment have occurred.

In view of these points, the present invention suppresses the axial amplitude of the joint pipe during resonance and increases the amplitude of the joint pipe without increasing the weight of the rotary shaft joint or reducing the allowable amount of misalignment. The objective is to suppress the increase in repetitive stress that occurs in the diaphragm.

[Means to solve the problem]

In order to solve the above problems, the damping mechanism in the rotary shaft joint according to the present invention is such that the end of the joint pipe and the end of the rotary shaft or other joint pipe are connected via a diaphragm, and the diaphragm has a In a rotary shaft joint in which a portion is fixed to the outer circumferential surface of the end of the joint tube and an outer circumferential portion is fixed to the rotary shaft side or another joint tube side, the rubber or soft rubber or soft An annular disk damper made of an elastic material such as synthetic resin is provided, and the outer circumferential portion of the annular disk damper is fixed to the rotating shaft side or another joint pipe side together with the outer circumferential portion of the diaphragm, and the inner diameter is fixed to the rotating shaft side or another joint pipe side. It is configured to fit into the circumferential groove formed on the outer circumferential surface of the joint pipe with a slight clearance in the axial direction, and to be able to freely slide on the bottom surface of the circumferential groove.

[Effect]

The present invention uses the fact that when an elastic material such as rubber or soft synthetic resin is repeatedly deformed by applying vibrations, a large amount of vibration energy is consumed due to its viscoelasticity, and vibrations with excessive amplitude are attenuated and suppressed. It is.

In other words, in the above configuration, if repeated displacement in the axial direction occurs between the joint pipe and the rotating shaft or other joint pipe due to input vibration, and the amount of displacement is relatively small, the annular disk damper has an inner diameter that is Due to the presence of the axial clearance, the amount of deformation caused by sliding is kept to a minimum, and the spring constant of the rotary shaft joint does not increase, allowing good vibration absorption operation of the diaphragm and the joint pipe. If the amount of displacement increases due to resonance beyond the allowable sliding amount between the inner diameter of the damper due to the clearance and the bottom surface of the circumferential groove, the inner diameter of the damper and the circumferential groove become in pressure contact,
Since the annular disc damper made of an elastic material such as rubber or soft synthetic resin is subjected to large repeated deformations, the spring constant of the rotary shaft joint increases and vibrations are damped by the vibration energy consuming effect.

[Embodiments] The present invention will be described below with reference to illustrated embodiments.

First, in the first embodiment shown in FIG. 1, 1 is a diaphragm whose inner diameter is fixed to the outer circumferential surface of the end of the joint pipe 2, and 8 is a rubber or soft synthetic material arranged in parallel on the outer surface of the diaphragm 1. This is an annular disc damper made of an elastic material such as resin, and the outer periphery of the diaphragm 1 and the annular disc damper 8 are held by a retainer ring 5 on the outer periphery of a hub 4 fixed to the shaft end of the rotating shaft 3. and are fixed together with bolts 6 and nuts 7. In the joint pipe 2,
A circumferential groove 11 is formed on the outer circumferential surface of the damper 8 at a position adjacent to the end thereof. They fit together with a clearance δ, and are capable of sliding on the bottom surface of the circumferential groove 11 within the range of the clearance δ.

In the rotary shaft joint of this embodiment having the above configuration, when repeated displacement in the axial direction occurs between the hub 4 and the joint pipe 2 due to vibration from the rotary shaft 3, if the amount of displacement is relatively small, , the inner diameter 10 of the annular disk damper 8 slides smoothly on the bottom surface of the circumferential groove 11 within the range of the clearance δ, and the deformation of the damper 8 is minimal and hardly increases the spring constant, so this joint is excellent. Demonstrates vibration absorption function.
Further, when the amount of displacement abnormally increases due to resonance, when the sliding between the inner diameter 10 and the bottom surface of the circumferential groove 11 reaches the allowable amount due to the clearance δ, as shown in FIGS. 2A and B, The inner diameter 10 and the circumferential groove 11 are pressed against each other, and the annular disc damper 8 undergoes large repeated deformations in the compression or tension direction as the joint pipe 2 is displaced in the X ₁ direction and the X ₂ direction. Therefore, as the spring constant increases, the damper 8 consumes vibration energy to suppress excessive amplitude. Therefore, since the amplitude of the joint tube 2 during resonance is suppressed, the repetitive stress generated in the diaphragm 1 does not become excessive, and the elastic force of the damper 8 hardly acts except during resonance.
The spring constant of the rotary shaft joint is maintained low and the allowable amount of misalignment is not impaired.

Next, FIG. 3 shows a joint main body portion including the diaphragm 1, the joint pipe 2, and the annular disc damper 8 in the first embodiment, which are connected in opposition to each other in the axial direction. The bolt 6 is inserted together with the outer periphery of the dampers 8, 8 and the retaining rings 5, 5 on the outside thereof, with the intervening ring 12 interposed therebetween.
and are fastened and fixed by a nut 7. In this case, by the same effect as in the first embodiment, excessive displacement between the two joint pipes 2, 2 during resonance can be suppressed.

[Effect of idea]

As described above, according to the present invention, when a normal small amplitude vibration is input, the inner diameter of the annular disc damper slides smoothly within the circumferential groove of the joint pipe, so that the elastic force of the damper hardly functions. Since the spring constant of the rotary shaft joint is kept soft, it exhibits a good vibration absorption function, and during resonance, the damper is repeatedly deformed, increasing the spring constant and consuming vibration energy, so that the diaphragm and Excessive displacement of the joint pipe is suppressed, and therefore a damping effect during resonance can be obtained without impairing the allowable amount of misalignment.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Fig. 2 A and B are also explanatory diagrams of operation, Fig. 3 is a half-cut sectional view showing another embodiment, and Fig. 4 is a conventional rotating shaft. It is a half-cut sectional view showing a joint. 1...Diaphragm, 2...Joint pipe, 3...Rotating shaft, 4...Hub, 8...Damper, 10...Inner diameter, 11...Peripheral groove, δ...Clearance.

Claims (1)

[Scope of utility model registration request] The end of the joint pipe and the rotating shaft or the end of another joint pipe are connected via a diaphragm, and the diaphragm has an inner peripheral part fixed to the outer peripheral surface of the joint pipe end and an outer peripheral part fixed to the outer peripheral surface of the joint pipe end. In a rotating shaft joint fixed to the rotating shaft side or another joint pipe side, an annular disc damper is provided which extends apart from the outer surface of the diaphragm and is made of an elastic material such as rubber or soft synthetic resin, and this annular disc damper is , the outer peripheral part is fixed to the rotating shaft side or another joint pipe side together with the outer peripheral part of the diaphragm, and the inner diameter has a slight clearance in the axial direction within a circumferential groove formed on the outer peripheral surface of the joint pipe. What is claimed is: 1. A damping mechanism for a rotary shaft joint, characterized in that the damping mechanism is fitted into the circumferential groove and is slidable on the bottom surface of the circumferential groove.