JP2004278580A - Tubular damper element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper element capable of being applicable to bearings from large size to small size and obtaining damping effect with a simple structure. <P>SOLUTION: In a wall surface of a tubular body (30) opened at least on one end in an axial direction, a slit (31) with fine width is formed in a plane shape so as to extend approximately along the wall surface and having a spring effect in side edge section, and a part of the plane-shaped slit is released from the cylinder body, and a viscous fluid is filled inside the plane-shaped slit. The vibration of an object (10) moves or transforms a side edge part of the plane-shaped slit and flows the viscous fluid, so that vibration of the object is damped by spring action of the side edge part of the plane-shaped slit and resistance action of the viscous fluid against flowing. The damper element can be utilized also as a torsion damper. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cylindrical damper element, and more particularly to a damper element capable of obtaining a damping effect (vibration damping effect) with a small and simple structure.
[0002]
[Prior art]
For example, when the rotating shaft is supported by the bearing, when the rotating speed of the rotating shaft is increased, the structure including the bearing and the rotating shaft resonates in a unique rotating speed range of the rotating shaft (see characteristic G in FIG. 5), When a vibration sound is generated and the magnitude of the vibration exceeds a safety value (see FIG. 5A) (dangerous rotation speed), the structure may be damaged or damaged.
[0003]
On the other hand, it has been practiced to use an extremely thick rotating shaft or to use the rotating shaft without rotating it at a high speed and to use it with the characteristics indicated by H in FIG. Further, if the bearing is supported by a spring member in order to suppress the vibration noise, as shown by the characteristic E in FIG. 5, the dangerous rotation speed is reduced, and the structure is damaged or damaged before reaching the use rotation speed. May be present. In order to solve such a problem, a damper device is provided to attenuate the magnitude of vibration in the resonance rotation speed range, thereby ensuring the safety of the device.
[0004]
Conventionally, in this type of damper device, the outside of the bearing is received by a collar, and a pair of O-rings are interposed between the collar and the housing at an interval from each other to form a space with a predetermined gap. When a viscous fluid such as oil is sealed and the rotating shaft vibrates, the O-ring is deformed and the collar is displaced. At that time, the viscous fluid in the gap is moved and the vibration is damped by the damping effect of the viscous fluid. An object is known (see Patent Document 1).
[0005]
In addition, a gauge-shaped holding spring formed in the cylindrical wall surface with a plurality of long grooves extending in the axial direction spaced apart from each other in the circumferential direction is supported on the housing, the bearing is elastically supported by the holding spring, and the rotating shaft vibrates. Then, a method of damping the vibration by elastic deformation of the holding spring is also known.
[0006]
Furthermore, a plurality of elastic pins are inserted in the collar on the outer side of the bearing in the axial direction at an interval in the circumferential direction, and both ends of the elastic pins are attached to a housing or the like. A method of damping vibration is known.
[0007]
[Patent Document 1] Japanese Patent Application Laid-Open No. 52-15951
[Problems to be solved by the invention]
However, the above-mentioned conventional damper device is intended to be applied to a relatively large bearing, and has a problem that the structure is complicated and expensive.
[0009]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a damper that can be applied to a large bearing to a small bearing, and that can obtain a damping effect with a simple structure.
[0010]
[Means for Solving the Problems]
The inventor of the present invention has conducted intensive research to solve the above-described problems, and found that a minute width slit is formed in a planar shape within the thickness of the collar on the outer side of the bearing, and the planar slit is filled with a viscous fluid such as oil. The side edge portion of the planar slit, for example, the inner edge portion moves or deforms in the radial direction in response to the vibration of the rotating shaft to flow the viscous fluid, and the spring action of the side edge portion of the planar slit at that time and the viscous fluid It has been found that the vibration can be attenuated by the resistance action against the flow, and the damper can be configured as one mechanical element instead of the damper device.
[0011]
Therefore, the cylindrical damper element according to the present invention is a damper element for attenuating the vibration of the target body, the entirety of which is formed in a cylindrical shape having at least one end opened in the axial direction, and the thickness of the wall surface of the cylindrical body. Inside, a slit of a fine width extends substantially along the wall surface and a side edge portion thereof is formed in a plane so as to have a spring property, and a part of the plane slit is released from the cylindrical body, The planar slit is filled with a viscous fluid, and the side edge portion of the planar slit moves or deforms in the radial direction due to the vibration of the object, and the viscous fluid flows, thereby causing the planar fluid to flow. The vibration of the object is attenuated by a spring action of a side edge portion of the slit and a resistance action to the flow of the viscous fluid.
[0012]
One of the features of the present invention is that a planar slit is formed in the thickness of the wall surface of the cylindrical body, and a viscous fluid such as oil is filled in the planar slit to constitute a damper element.
[0013]
Thereby, for example, when the bearing supported on the inner surface side of the cylindrical body receives the vibration of the rotating shaft, the side edge portion of the planar slit of the cylindrical body moves or deforms in the radial direction, and the planar slit is deformed, The viscous fluid inside flows, the side edges of the planar slit at that time act as springs, and the viscous fluid shows resistance to the flow, so that the vibration of the rotating shaft is attenuated.
[0014]
The relationship between the cylindrical body and the mounting base, such as the housing, and the target body, such as a bearing and a rotating shaft, may be such that the outer side of the cylindrical body is the target body and the inner side is the mounting base. You may. That is, it is preferable that the outer surface side of the cylindrical body is attached to the mounting base, and the target body whose vibration is to be attenuated is supported on the inner surface side of the cylindrical body.
[0015]
Since the planar slit is partially open, the viscous fluid may be pushed out of the planar slit. Therefore, it is preferable that a viscous fluid be supplied to the planar slit. That is, it is preferable that a fluid supply port that supplies the viscous fluid and that is connected to the planar slit is formed in the cylindrical body. In this case, since the width of the planar slit is very small, the width of the planar slit is narrowed, the viscous fluid is pushed out, and when the planar slit returns to the original state, the viscous fluid is sucked from the fluid supply port. Will naturally return to the original full state.
[0016]
The object may be a rolling bearing, a sliding bearing, a rotating shaft, or any other object that causes vibration. In the case of rolling bearings and plain bearings, the cylindrical body can use a collar into which the rolling bearing or plain bearing is fitted, for example, standardizing the rolling bearing and collar assembly so that it can be replaced with an existing one You can also.
[0017]
Further, the cylindrical body itself may be a plain bearing. In this case, since the spring constant of the side edge portion of the planar slit can be arbitrarily controlled by the shape of the slit, the vibration stability at the time of high-speed rotation of the rotating shaft can be greatly improved.
[0018]
The material of the cylindrical body is not particularly limited, and any material such as SUS may be used as long as the side edge portion of the planar slit has a spring property.
[0019]
The cylindrical body may have any shape as long as at least one in the axial direction is open. For example, the inner and outer surfaces may be a polygonal cylindrical shape, or an arbitrary outer surface, and the inner surface may be a cylindrical shape with a continuous waveform in a substantially circular or polygonal shape, but is applied to a cylindrical bearing or a rotating shaft. Considering this, a cylindrical shape is preferable. When the cylindrical body has a cylindrical shape, planar slits are preferably opened at both end surfaces in the axial direction for manufacturing.
[0020]
The shape of the planar slit may be any shape as long as the slit having a fine width extends substantially along the wall surface within the thickness of the wall surface of the cylindrical body and the side edge portion has a spring property. It may be a surface extending along the wall surface of the cylindrical body, or may be a double surface shape extending folded back in the middle, furthermore, the starting end starts within the thickness of the wall surface, and the end side is opened on the outer surface or the inner surface of the cylindrical body. It may be a flat surface.
[0021]
Further, the number of the planar slits may be one or plural. In the case of a plurality of cylindrical members, it is preferable to provide them symmetrically with respect to the axis of the cylindrical member so as to uniformly receive the radial vibration of the cylindrical member.
[0022]
The method for forming the planar slit is not particularly limited, and for example, electric discharge machining such as wire cut electric discharge machining or laser machining can be used.
[0023]
The width of the planar slit may be a minute width, and depends on the size, material, intended spring constant, physical properties of the viscous fluid (eg, viscosity, etc.), frequency and amplitude of vibration to be damped, etc. It is better to set appropriately. According to experiments performed by the inventors of the present invention, it has been confirmed that it is practically preferable to set the thickness to 0.5 mm or less, preferably to 0.2 mm or less. When the width of the planar slit exceeds 0.5 mm, the viscous fluid always leaks, and the expected damping effect cannot be obtained.
[0024]
Further, according to the experiments of the present inventors, it was found that the damper element of the present invention can be used also as a torsional damper. That is, when the rotating shaft is divided into two and the opposite end is supported by the cylindrical body, the rotation direction when one (or the other) rotating shaft is transmitted to the other (or one) rotating shaft. Is generated, but the torsion can be absorbed by the spring action of the side edge portion of the planar slit and the resistance action due to the viscosity of the viscous fluid.
[0025]
That is, according to the present invention, a damper element is provided between two rotating bodies and absorbs a twist in the rotating direction between the rotating bodies. The rotating body is inserted and supported, and has a cylindrical shape in which the other rotating body is supported outside, and a slit of a fine width extends substantially along the wall surface within the thickness of the wall surface of the cylindrical body and is formed on the side thereof. The edge portion is formed in a planar shape having a spring property, a part of the planar slit is opened from the cylindrical body, and the planar slit is filled with a viscous fluid. By twisting between the two rotating bodies, the side edge portion of the planar slit is moved or deformed in the circumferential direction and the viscous fluid is caused to flow, so that the spring action of the side edge portion of the planar slit and the viscous fluid To resist flow The torsion between the rotary body is no to be absorbed I can provide a torsional damper element and said.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. 1 and 2 show a preferred embodiment of a tubular damper element according to the present invention. In the figure, a rotating shaft 10 is rotatably supported by a rolling bearing 20, is inserted inside a cylindrical collar (cylindrical body) 30 outside the rolling bearing 20, and is formed by a projection 34 on one edge of the collar 30. The collar 30 is positioned and held by being sandwiched by a housing (mounting base) 50.
[0027]
Within the thickness of the wall surface of the collar 30, two minute slits (for example, 0.2 mm in width) of a planar slit 31 extend almost one round along the wall surface, and then bend smoothly toward the center. Further, by being formed in a planar shape so as to extend approximately 0.5 times around the circumference and to extend over the entire length in the axial direction, the side edges of the planar slit 31 are provided with spring properties.
[0028]
A circular hole 36 having a diameter larger than the width of the planar slit 31 is formed at both ends in the circumferential direction of the planar collar 31 over the entire length in the axial direction. This circular hole 36 is a hole for inserting a wire when the planar slit 31 is formed by wire-cut electric discharge machining, but prevents cracks from being generated at the end of the planar slit 31 after the processing. It functions as a hole.
[0029]
An oil supply pipe 40 is attached to the housing 50, an oil supply passage 33 is formed on the outer peripheral surface of the collar 30, and an internal passage 41 of the oil supply pipe 40 communicates with the oil supply passage 33. An oil supply port 32 is formed at substantially equal angular intervals on a wall surface of the oil supply 30, and the oil supply port 32 communicates with an oil supply passage 33, and oil (viscous fluid) is supplied and filled in the planar slit 31. Have been.
[0030]
Next, the operation of the collar 30 will be described. The rotating shaft 10 is rotated, and vibration may occur in the rotating shaft 10 and the rolling bearing 20 due to processing accuracy and the like. Then, in the collar 30 of the present example, the side edge portion of the planar slit 31 has a spring property, so that the side edge portion of the planar slit 31 vibrates in the radial direction of the rolling bearing 20 (for example, see arrow A in FIG. 2). Then, the side edge portion of the planar slit 31 is elastically deformed against the spring force, and the width of the planar slit 31 is reduced.
[0031]
Then, when the width of the planar slit 31 is reduced, the oil inside at that portion flows, and a part of the oil is extruded from the planar slit 31. At this time, the side edge portion of the planar slit 31 acts as a spring, and the oil shows resistance to the flow, so that the vibration of the rotating shaft 10 and the bearing 20 is greatly attenuated (see the characteristic F in FIG. 5). ). This was also confirmed by the prototype damper element of the present inventors.
[0032]
When the side edge portion of the planar slit 31 receives the vibration in the opposite direction (see the arrow B in FIG. 2), the vibration is attenuated in the direction in the direction by the same action as described above. Further, in the portion in the direction A, the planar slit 31 returns to the original state by the spring force, and at this time, the width of the planar slit 31 increases, so that the oil in the oil supply passage 33 is sucked through the oil supply port 32. Is filled to its original condition.
[0033]
When the oil in the oil supply passage 33 runs short, oil is supplied from the oil supply pipe 40.
[0034]
The above-described operation is the same for radial vibration of the collar 30, such as the directions of arrows C and D in FIG.
[0035]
Further, if the rolling bearing 20 and the collar 30 of this embodiment are assembled in advance, the existing rolling bearing and collar can be replaced.
[0036]
FIG. 3 shows another embodiment, and the same reference numerals in FIGS. 1 and 2 denote the same or corresponding parts. In these two examples, the shape of the planar slit 31 within the wall thickness of the collar 30 is different from that of the first embodiment. By making the shape of the planar slit 31 different in this manner, the side edge portion can have a different spring constant.
[0037]
FIG. 4 shows still another embodiment of the shape of the planar slit within the wall thickness of the collar. As shown in FIGS. 4 (a) and 4 (b), the planar slit may have a planar shape in which the starting end starts within the thickness of the wall and the end is opened on the outer surface (or the inner surface) of the collar. .
[0038]
As shown in FIGS. 4 (c) and 4 (d), the planar slit starts at the inside of the thickness of the wall surface and is folded back in the middle to extend double, and the terminal end is the outer surface of the collar (or may be the inner surface). It can also be made into a planar shape that is opened by the.
[0039]
Further, as shown in FIGS. 4 (e) and 4 (f), the planar slit has a double-sided start that starts within the thickness of the wall surface and is folded back halfway and ends at the outer surface of the collar (or the inner surface). It is also possible to make a pair of a combination of a planar shape that is opened by the above and a planar shape of the opposite shape, and provide a plurality of these pairs.
[0040]
FIG. 6 schematically shows the concept of the torsional damper element according to the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In the torsional damper element of the present example, one of the opposite ends of two rotating shafts (rotating bodies) 60, 61 is inserted into the inner surface of the cylindrical body 30 to be supported, and the other rotating body 61 is supported by the collar 62. One rotating shaft is constituted by supporting the outer surface of the tubular body 30 through the intermediary.
[0041]
Now, let the rotating shaft 60 be the driving side and the rotating shaft 61 be the driven side. When the rotating shaft 60 is rotated, the rotation is transmitted to the rotating shaft 61 via the tubular body 30 and the collar 62, and at that time, a rotational twist is generated between the rotating shaft 60 and the rotating shaft 61. . Then, in the cylindrical body 30, the planar slit 31 having a fine width is deformed or moved in the circumferential direction, and a viscous fluid such as oil in the planar slit 31 flows, and a side edge portion of the planar slit 31 at this time. The torsion of the rotating shafts 60 and 61 is absorbed by the spring action of the above and the resistance action by the viscosity of the viscous fluid.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a preferred embodiment of a tubular damper element according to the present invention.
FIG. 2 is an end view showing a collar (cylindrical body) in the embodiment.
FIG. 3 is a diagram showing another embodiment.
FIG. 4 is a diagram showing still another embodiment.
FIG. 5 is a diagram for explaining a damping effect.
FIG. 6 is a view schematically showing the concept of a torsional damper element according to the present invention.
[Explanation of symbols]
10 Rotary shaft 20 Rolling bearing 30 Collar (tubular body)
31 planar slit 32 oil supply port 40 housing (mounting base)
60, 61 Rotating shaft (rotating body)

Claims (7)

A damper element for attenuating vibration of the object,
The whole has a cylindrical shape with at least one end in the axial direction open,
Within the thickness of the wall surface of the cylindrical body, a slit having a fine width extends substantially along the wall surface, and a side edge portion thereof is formed in a planar shape so as to have a spring property, and a part of the planar slit is formed. Opened from the cylindrical body, the planar slit is filled with a viscous fluid,
By vibrating the object, the side edge portion of the planar slit moves or deforms in the radial direction and causes the viscous fluid to flow, so that a spring action of the side edge portion of the planar slit and the flow of the viscous fluid are prevented. A cylindrical damper element, wherein the vibration of the object is attenuated by a resistance action. 2. The tubular damper element according to claim 1, wherein the tubular body has a tubular shape in which an outer surface side is attached to a mounting base and an inner surface side of the tubular body supports the object to be attenuated. The tubular damper element according to claim 1, wherein the tubular body has a fluid supply port that communicates with the planar slit and supplies the viscous fluid. The tubular damper element according to any one of claims 1 to 3, wherein the tubular body has a cylindrical shape, and the planar slits are open at both end surfaces in the axial direction. 5. The tubular damper element according to claim 1, wherein said tubular body is a collar into which a rolling bearing or a slide bearing is fitted. The tubular damper element according to any one of claims 1 to 5, wherein a plurality of said planar slits are formed in a wall surface of said tubular body. A damper element that is provided between two rotating bodies and absorbs a twist in a rotating direction between the rotating bodies,
At least one end in the axial direction is opened as a whole, and one of the rotating bodies is inserted and supported, and the other has a cylindrical shape in which the other rotating body is supported outside,
Within the thickness of the wall surface of the cylindrical body, a slit having a fine width extends substantially along the wall surface, and a side edge portion thereof is formed in a planar shape so as to have a spring property, and a part of the planar slit is formed. Opened from the cylindrical body, the planar slit is filled with a viscous fluid,
By twisting between the two rotating bodies, the side edge portion of the planar slit is moved or deformed in the circumferential direction and the viscous fluid is caused to flow, so that the spring action of the side edge portion of the planar slit and the viscosity A torsion damper element characterized in that the torsion between the rotating bodies is absorbed by a resistance action against the flow of the fluid.

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