JPH0219617Y2 - - 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 is installed on the outer circumference of the hub 51 to protect the outer circumference of the diaphragm 53 whose inner diameter is fixed to the outer circumference of the end of the joint pipe 52.
A rotary shaft joint is known in which the rotary shaft 50 is fastened and fixed with a bolt 55 and a nut 56. 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 If there is a relative misalignment between the axes of the other rotating shaft (not shown), the joint pipe 52
is angularly displaced, and the diaphragm 53 is deflected accordingly to absorb the misalignment.

[The problem that the idea aims 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 outer circumferential portion The outer circumference of an annular lip-shaped damper made of an elastic material such as rubber or soft synthetic resin is fixed to a guard member fixed to the outer circumference of the diaphragm, and the inner diameter lip of the damper, which extends in a curved manner in the axial direction, It has a structure in which it is slidably pressed against the outer peripheral surface of the joint pipe.

[Effect]

This invention utilizes 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 the vibration damping force due to the frictional resistance of this elastic material is utilized. This damps and suppresses vibrations with excessive amplitude.

In other words, in the above configuration, when repeated displacement in the axial direction occurs between the joint pipe and the rotating shaft or other joint pipe due to input vibration, if the amount of displacement is relatively small, the curved portion of the lip-shaped damper will change accordingly. The bending portion is repeatedly deformed with a small amplitude, and the vibration energy consumption effect is extremely small. However, when the amount of displacement increases abnormally due to resonance, the curved portion is repeatedly deformed to a large extent, and the inner diameter lip portion extending in the axial direction is It slides on the outer circumferential surface of the joint pipe, thereby generating a large vibration damping force.

〔Example〕

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

First, in the first embodiment shown in FIG. 1, 1 is a diaphragm whose inner diameter is fixed to the outer peripheral surface of the end of the joint pipe 2, and 5 is a guard member arranged in parallel on the outer surface of the diaphragm 1. The outer peripheries of the diaphragm 1 and the guard member 5 are fixed together to the outer periphery of a hub 4 fixed to the shaft end of the rotating shaft 3 with bolts 6 and nuts 7. Reference numeral 8 designates an annular lip-shaped damper whose outer periphery is made of an elastic material such as rubber or soft synthetic resin and is fixed to the inner step 5a of the outer surface of the guard member 5 by a bolt 9, and whose outer periphery is made of an elastic material such as rubber or soft synthetic resin. Inner diameter lip part 1
0 is the small diameter side outer peripheral surface 11 of the stepped portion of the joint pipe 2
is in slidable contact with the appropriate interference.

In the rotary shaft joint of this embodiment having the above configuration, when repeated axial displacement occurs between the hub 4 and the joint pipe 2 due to axial vibration of the rotary shaft 3, the amount of displacement is relatively small. The lip portion 10 of the lip-shaped damper 8, which has a large sliding resistance, and the outer circumferential surface 11 of the joint pipe 2 do not slide relative to each other, and the repeated deformation that occurs in the curved portion of the damper 8 is minute.

Now, considering the case where the amount of axial displacement abnormally increases due to resonance, when the joint pipe 2 is displaced in the _X1 direction as shown in FIG. 2A, the lip portion 10 of the damper 8 is It is difficult to slide toward the side, and at this time, in this embodiment, the tip of the lip portion 10 abuts against the stepped portion of the joint pipe 2, so the lip portion 10 also follows in the same direction,
The damper 8 is deformed so that the curvature of the curved portion becomes larger, and due to this deformation, the interference increases significantly, and as shown in FIG. 2B, the joint pipe ₂ becomes
When the damper 8 is displaced in the direction, the curved portion of the damper 8 is deformed to have a larger curvature, and the lip portion 10 of the damper 8 relatively slides on the outer circumferential surface 11 toward the diaphragm 1 with an appropriate load. Repeatedly, the damper 8 consumes vibration energy by the damping force due to the viscoelasticity of the elastic material and the damping force due to the sliding, so that excessive amplitude can be suppressed.

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

Furthermore, FIG. 4 shows that in the first embodiment described above, the outer circumferential surface of the joint pipe 2 is subjected to centrifugal force due to high-speed rotation.
The outer periphery of the lip portion 10 is tightened with a tightening ring 13 in order to prevent the tightening margin of the lip portion 10 of the damper 8 from being reduced and the vibration damping force due to sliding to be impaired.

[Effect of idea]

As described above, according to the present invention, during resonance, vibration energy is consumed due to repeated deformation of the lip-shaped damper, and the lip portion of the inner diameter of the damper slides with the joint pipe with an appropriate pressure force. Due to vibration energy consumption, excessive displacement of the diaphragm and joint pipe can be suppressed, and since the spring constant is not changed by adjusting the wall thickness of the diaphragm, it is possible to suppress the excessive displacement of the diaphragm and the joint pipe during resonance without compromising the allowable amount of misalignment. It is possible to obtain a vibration damping effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the first embodiment of the present invention, Figs. 2 A and B are also explanatory diagrams of operation, Figs. 3 and 4 are half-cut sectional views showing other embodiments, and Fig. 5 is a half-cut sectional view showing a conventional rotary shaft joint. DESCRIPTION OF SYMBOLS 1...Diaphragm, 2...Joint pipe, 3...Rotating shaft, 4...Hub, 8...Damper, 10...Lip part, 11...Outer peripheral surface.

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 that is fixed to the rotating shaft side or another joint pipe side, a guard member made of elastic material such as rubber or soft synthetic resin is installed on the guard member that is spaced apart from and parallel to the outer surface of the diaphragm and whose outer periphery is fixed to the outer periphery of the diaphragm. The outer circumferential portion of an annular lip-shaped damper made of material is fixed, and the inner diameter lip portion of the damper, which extends in a curved manner in the axial direction, is slidably pressed against the outer circumferential surface of the joint pipe. Damping mechanism in rotating shaft joints.