JP7266338B2 - Vibration control damper - Google Patents

Description

The present invention relates to a vibration damper.

Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2004-19695) describes a support member. The support member described in Patent Document 1 is made of rubber. The support member has a body, a head and a neck.

The body portion extends along the axial direction of the support member. The body portion has an end face in the axial direction of the support member. The head is at the distal end of the support member. The outer diameter of the head decreases toward the tip of the support member. The neck connects the end face of the main body and the head. The head is inserted through a through hole formed in the housing of the vibration source device. Thereby, the supporting member can absorb the vibration from the device that is the vibration source.

Japanese Unexamined Patent Application Publication No. 2004-19695

When trying to increase the vibration absorbing ability of the supporting member, it is preferable to form the supporting member from rubber having a large Tan δ value. However, since the deformation speed of the rubber decreases as the value of Tan δ increases, it becomes difficult to insert the head into the through hole when the ratio of the inner diameter of the through hole to the outer diameter of the head is small.

The present invention has been made in view of the problems of the prior art as described above. More specifically, the present invention provides a vibration damper capable of enhancing vibration absorption while ensuring insertability into a through hole.

A vibration damper according to an aspect of the present invention is made of rubber and includes a damper body and a plurality of first standing walls. The main body extends in the axial direction along the central axis of the vibration damper and has an end face in the axial direction. The first standing wall stands up from the end face toward the tip of the vibration damper along the axial direction, and extends radially along the radial direction orthogonal to the axial direction from the central axis in plan view. there is The first standing wall has a first portion, a second portion, and a third portion. The first portion is connected to the end face. The second portion is connected to the end of the first portion axially opposite the end face. The third portion is connected to an axially opposite end of the second portion from the first portion. The radial width of the first portion is smaller than the radial width of the second portion. The width of the third portion in the radial direction decreases with increasing distance from the second portion. Tan delta of rubber is 0.25 or more.

The vibration damper described above may further include a reinforcing portion. The reinforcing portion may be connected to the two first standing walls and the end face that are adjacent in the circumferential direction, which is the direction along the circumference centered on the central axis.

The vibration damper described above may include a plurality of second standing walls. The second standing wall may stand up from the end surface toward the tip along the axial direction and radially extend from the central axis in a plan view. The second vertical wall may be between two first vertical walls that are adjacent in the circumferential direction, which is the direction along the circumference centered on the central axis. The second standing wall includes a fourth portion connected to the end face, a fifth portion connected to an end of the fourth portion axially opposite to the end face, and an axially opposite side to the fourth portion. and a sixth portion connected to the end of a fifth portion. The radial width of the fourth portion may be smaller than the radial width of the fifth portion. The width of the sixth portion in the radial direction may decrease with increasing distance from the fifth portion. The radial width of the sixth portion may be smaller than the radial width of the third portion at the same axial distance from the tip.

The vibration damper described above may further include a reinforcing portion. The reinforcing portion may be connected to the first vertical wall, the second vertical wall, and the front end face, which are adjacent in the circumferential direction.

According to the vibration damper according to the aspect of the present invention, the ability to absorb vibration can be enhanced while ensuring insertability into the through-hole.

2 is a front view of the vibration damper 10; FIG. 2 is a plan view of the vibration damper 10; FIG. FIG. 3 is a cross-sectional view along III-III in FIG. 2; It is a front view of the vibration control damper 10A. 4 is a front view of the vibration damper 70. FIG. 4 is a plan view of the vibration damper 70. FIG. FIG. 7 is a cross-sectional view along VII-VII of FIG. 6; 4 is a front view of the vibration damper 80. FIG. 3 is a plan view of the vibration damper 80. FIG. FIG. 10 is a cross-sectional view taken along line XX of FIG. 9;

Details of embodiments of the present invention will be described with reference to the drawings. In the drawings below, the same or corresponding parts are denoted by the same reference numerals, and redundant description will not be repeated.

(First embodiment)
A vibration damper (hereinafter referred to as "vibration damper 10") according to the first embodiment will be described.

<Configuration of vibration damper 10>
The damping damper 10 is made of rubber (made of rubber). Tan δ of rubber used for the vibration damper 10 is 0.25 or more. Tan δ of rubber used for the vibration damper 10 is preferably 0.3 or more. Tan δ of rubber used for the vibration damper 10 is, for example, 2.5 or less. Tan δ of rubber is measured by a method based on JIS K 6394:2007. More specifically, using a dynamic viscoelasticity measuring device Rheogel-E4000 (manufactured by UBM Co., Ltd.), Tan δ of the rubber used for the vibration damper 10 is measured under the test conditions described in Table 1 below. be done.

As shown in Table 1, the measurement temperature for measuring Tan δ is 25°C. The measurement frequency for measuring Tan δ is 30 Hz. The shape of the test piece for measuring Tan δ was a strip of length 15 mm×width 5 mm×thickness 2 mm. The measurement mode for measuring Tan δ is the tensile mode. The initial strain in measuring Tan δ is assumed to be ±0.013 percent. In measuring Tan δ, the specimen is stretched to an initial strain of 13.0 percent.

The larger the Tan δ of the rubber, the closer the mechanical properties of the rubber are to those of a viscous body (the closer the Tan δ of the rubber is to 0, the closer the mechanical properties of the rubber are to those of an elastic body). Therefore, by forming the vibration damper 10 from rubber having a large Tan δ, the vibration absorption capacity of the vibration damper 10 is increased, but the insertability into the through hole is reduced.

Specific examples of rubbers having a Tan δ of 0.25 or more include regular butyl rubber, butyl rubber including halogenated butyl rubber, ethylene propylene diene rubber (EPDM), fluororubber, acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR) ), silicone rubber and natural rubber. Specific examples of rubbers having a Tan δ of 0.3 or more include regular butyl rubber, butyl rubber including halogenated butyl rubber, ethylene propylene diene rubber (EPDM), fluororubber, acrylonitrile butadiene rubber (NBR), styrene butadiene rubber (SBR). ). However, the rubber used for the damping damper 10 is not limited to these.

FIG. 1 is a front view of the vibration control damper 10. FIG. FIG. 2 is a plan view of the vibration control damper 10. FIG. FIG. 3 is a cross-sectional view along III-III in FIG. The vibration control damper 10 has a central axis A as shown in FIGS. The vibration damper 10 has a distal end 10a and a proximal end 10b in a direction along the central axis A (hereinafter referred to as "axial direction"). The proximal end 10b is the end axially opposite the distal end 10a. The damping damper 10 has a damper body 1 and a plurality of first vertical walls 2 . The damper main body 1 and the first standing wall 2 are integrally molded.

The damper body 1 has a columnar shape extending along the axial direction. The damper body 1 has, for example, a circular shape in a cross-sectional view perpendicular to the axial direction. The damper body 1 has an end face 1a and an end face 1b. The end face 1a and the end face 1b are end faces of the damper body 1 in the axial direction. The end surface 1b is the opposite surface of the end surface 1a in the axial direction. The end face 1a is positioned closer to the tip 10a than the end face 1b in the axial direction.

The damper body 1 has an outer peripheral surface 1c. An annular groove 1d is formed in the outer peripheral surface 1c. The annular groove 1d goes around in a direction along the circumference centering on the central axis A (hereinafter referred to as "circumferential direction"). The outer peripheral surface 1c is recessed toward the central axis A in the annular groove 1d. A hole 1 e is formed in the damper body 1 . A hole 1e is formed in the end surface 1b. The hole 1e extends axially from the end face 1b toward the end face 1a. The hole 1e has a circular shape in a cross-sectional view perpendicular to the axial direction. Note that the hole 1 e may pass through the damper body 1 .

The first standing wall 2 stands up from the end surface 1a toward the tip 10a along the axial direction. When the vibration damper 10 is viewed along the axial direction from the tip 10a side (hereinafter referred to as "plan view"), the first standing wall 2 extends in a direction orthogonal to the axial direction (hereinafter referred to as "radial direction"). ) radially.

In the example of the vibration damper 10 shown in FIGS. 1 to 3, the number of first vertical walls 2 is four. However, the number of first standing walls 2 is not limited to this as long as it is two or more. In the example of the vibration damper 10 shown in FIGS. 1 to 3, the intervals between the first standing walls 2 in the circumferential direction are constant, but the intervals may not be constant.

The first standing wall 2 has a first portion 21 , a second portion 22 and a third portion 23 . The lower end of the first portion 21 is connected to the end surface 1a. The lower end of the second portion 22 is connected to the upper end of the first portion 21 , and the lower end of the third portion 23 is connected to the upper end of the second portion 22 .

The width in the radial direction of the first portion 21 is defined as width W1. The width W1 is the distance between the radial end of the first portion 21 and the central axis A. As shown in FIG. The width in the radial direction of the second portion 22 is defined as width W2. The width W2 is the distance between the radial end of the second portion 22 and the central axis A. As shown in FIG. The width in the radial direction of the third portion 23 is assumed to be width W3. The width W3 is the distance between the radial end of the third portion 23 and the central axis A.

Width W1 is smaller than width W2. Width W1 and width W2 are, for example, constant along the axial direction. From another point of view, a step is formed at the radial end of the first standing wall 2 at the boundary between the first portion 21 and the second portion 22 . The width W2 is larger than 1/2 of the inner diameter of the through hole through which the first standing wall 2 is inserted.

The width W3 becomes smaller as the distance from the second portion 22 increases. This facilitates the insertion of the first standing wall 2 into the through hole. A width W3 at the lower end of the third portion 23 is equal to the width W2.

Let thickness T be the thickness of the first standing wall 2 . The thickness T is constant regardless of the position. The thickness T may decrease with distance from the central axis A along the radial direction. In this case, resistance during insertion is further reduced, and insertability into the through hole is further improved. The thickness T may decrease as it approaches the tip 10a along the axial direction. In this case, since the change in the resistance that increases as the insertion progresses can be felt more remarkably, it is easy to judge the completion of the insertion by tactile sensation, and workability is improved.

<Effect of damper 10>
The effect of the vibration damper 10 will be described in comparison with a vibration damper according to a comparative example (hereinafter referred to as "vibration damper 10A").

FIG. 4 is a front view of the vibration control damper 10A. As shown in FIG. 4, the configuration of the vibration damper 10A is the same as the configuration of the vibration damper 10, except that the neck portion 3 and the head portion 4 are used instead of the first standing wall 2. As shown in FIG.

The neck portion 3 extends along the axial direction from the end face 1a toward the tip 10a. In a cross-sectional view perpendicular to the central axis A, the neck 3 has a circular shape. The radius of the neck portion 3 is defined as radius R1. Radius R1 is equal to width W1. The axial length of the neck portion 3 is equal to the axial length of the first portion 21 .

The head 4 extends axially from the upper end of the neck 3 toward the tip 10a. The head 4 has a first portion 41 and a second portion 42 . The first portion 41 is connected to the upper end of the neck portion 3 . The second portion 42 is connected to the upper end of the first portion 41 . In a cross-sectional view perpendicular to the central axis A, the first portion 41 and the second portion 42 have a circular shape.

The axial lengths of the first portion 41 and the second portion 42 are equal to the axial lengths of the second portion 22 and the third portion 23, respectively. A radius of the first portion 41 is defined as a radius R2. Let the radius of the second portion 42 be R3. Radius R2 is equal to width W2. Radius R3 is equal to width W3.

An insertion test into a through-hole performed using the vibration damper 10 and the vibration damper 10A will be described. The vibration damper 10 and the vibration damper 10A used in this insertion test were made of regular butyl rubber.

In this insertion test, the ratio of the inner diameter of the through-hole to twice the width W2 (radius R2) is changed to evaluate whether or not the first vertical wall 2 (the neck portion 3 and the head portion 4) can be inserted through the through-hole. It was done by The results are shown in Table 2. "○" in Table 2 indicates that the first standing wall 2 (neck portion 3 and head portion 4) could be inserted through the through hole, and "×" in Table 2 indicates that the first standing wall 2 (neck portion 3 and head 4) could not be inserted.

As shown in Table 2, in the damping damper 10A, when the ratio of the inner diameter of the through hole to twice the radius R2 is less than 98.3%, the neck 3 and the head 4 are inserted into the through hole. I couldn't. On the other hand, in the vibration damper 10, even if the ratio of the inner diameter of the through hole to twice the width W2 was 86.2%, the first vertical wall 2 could be inserted through the through hole.

As described above, according to the vibration damper 10, even if rubber having a Tan δ of 0.25 or more is used, it is possible to ensure insertability into the through hole. In addition, since the vibration damper 10 uses rubber having a Tan δ of 0.25 or more, it is possible to enhance the vibration absorbing ability.

(Second embodiment)
A vibration damper (hereinafter referred to as "vibration damper 70") according to the second embodiment will be described below. Here, differences from the vibration damper 10 will be mainly described, and redundant description will not be repeated.

The vibration damper 70 has a central axis A, a distal end 10a and a proximal end 10b. The damping damper 70 has a damper body 1 and a plurality of first standing walls 2 . Regarding these points, the configuration of the vibration damper 70 is common to the configuration of the vibration damper 10 .

FIG. 5 is a front view of the vibration control damper 70. FIG. FIG. 6 is a plan view of the vibration control damper 70. FIG. 7 is a cross-sectional view along VII-VII in FIG. 6. FIG. As shown in FIGS. 5, 6 and 7, the vibration control damper 70 further has at least one reinforcing portion 5. As shown in FIG. In this regard, the configuration of the vibration damper 70 is different from the configuration of the vibration damper 10 .

The width of the reinforcement portion 5 in the radial direction is defined as a width W4. The width W4 is the distance between the radial end of the reinforcing portion 5 and the central axis A. As shown in FIG. The width W4 is less than or equal to the width W1. The width W4 decreases from the lower end side of the reinforcing portion 5 toward the upper end side of the reinforcing portion 5 . The number of reinforcements 5 is preferably equal to the number of first standing walls 2 . The reinforcing portion 5 is connected to two first standing walls 2 and the end surface 1a that are adjacent in the circumferential direction.

When a load acts on the vibration damper 10 to pull the first vertical wall 2 out of the through hole after the first vertical wall 2 has been inserted into the through hole, the second portion 22 supports the member in which the through hole is formed. By doing so, the first vertical wall 2 is prevented from slipping out of the through hole.

However, when such a load becomes large, the first vertical wall 2 is deformed and the second portion 22 cannot support the member having the through hole. As a result, the first vertical wall 2 may come out of the through hole. be.

On the other hand, in the vibration suppression damper 70, even if a load acts on the vibration suppression damper 70 so as to pull the first vertical wall 2 out of the through hole, the deformation of the first vertical wall 2 is restricted by the reinforcing portion 5. It is possible to further suppress the standing wall 2 from slipping out of the through hole.

(Third embodiment)
A vibration damper (hereinafter referred to as "vibration damper 80") according to the third embodiment will be described below. Here, points different from the vibration suppression damper 70 will be mainly described, and redundant description will not be repeated.

The vibration damper 80 has a central axis A, a distal end 10a and a proximal end 10b. The damping damper 80 has a damper body 1 , a plurality of first vertical walls 2 and a reinforcing portion 5 . Regarding these points, the configuration of the vibration damper 80 is common to the configuration of the vibration damper 70 .

FIG. 8 is a front view of the vibration control damper 80. FIG. FIG. 9 is a plan view of the vibration control damper 80. FIG. 10 is a cross-sectional view taken along line XX of FIG. 9. FIG. As shown in FIGS. 8, 9 and 10, the vibration damper 80 further has at least one or more second standing walls 6. As shown in FIGS. In this regard, the configuration of the vibration damper 80 is different from that of the vibration damper 70 .

The second standing wall 6 is located between two first standing walls 2 adjacent in the circumferential direction. The number of second vertical walls 6 is preferably equal to the number of first vertical walls 2 . In addition, the reinforcement part 5 has connected the 1st vertical wall 2 and the 2nd vertical wall 6 which adjoin in the circumferential direction, and the end surface 1a.

The second standing wall 6 has a fourth portion 61 , a fifth portion 62 and a sixth portion 63 . The lower end of the fourth portion 61 is connected to the end surface 1a. The lower end of the fifth portion 62 is connected to the upper end of the fourth portion 61 , and the lower end of the sixth portion 63 is connected to the upper end of the fifth portion 62 .

The width in the radial direction of the fourth portion 61 is assumed to be width W5. The width W5 is the distance between the radial end of the fourth portion 61 and the central axis A. As shown in FIG. The width in the radial direction of the fifth portion 62 is defined as width W6. The width W6 is the distance between the radial end of the fifth portion 62 and the central axis A. The width in the radial direction of the sixth portion 63 is defined as width W7. The width W7 is the distance between the radial end of the sixth portion 63 and the central axis A.

Width W5 is smaller than width W6. Width W5 and width W6 are, for example, constant along the axial direction. From another point of view, a step is formed at the radial end of the second standing wall 6 at the boundary between the fourth portion 61 and the fifth portion 62 . The width W5 is equal to or greater than the width W4 and equal to or less than the width W1. Width W6 is, for example, equal to width W2. The width W7 becomes smaller as the distance from the fifth portion 62 increases. A width W7 at the lower end of the sixth portion 63 is equal to the width W6. Width W7 is smaller than width W3 when compared at positions where the distance in the axial direction from tip 10a is the same.

In the vibration damper 80, a through hole is formed not only by the second portion 22 but also by the fifth portion 62 when a load acting on the vibration damper 80 pulls the first vertical wall 2 out of the through hole. A member can be supported. Therefore, according to the vibration suppression damper 80, it is possible to further suppress the first standing wall 2 from slipping out of the through hole. In the damping damper 80, the width W7 is smaller than the width W3 when compared at positions where the distance in the axial direction from the tip 10a is the same. The accompanying decrease in insertability into the through-hole is suppressed.

Although the embodiment of the present invention has been described as above, it is also possible to modify the above-described embodiment in various ways. Also, the scope of the present invention is not limited to the embodiments described above. The scope of the present invention is indicated by the scope of claims, and is intended to include all changes within the meaning and scope of equivalence to the scope of claims.

The above-described embodiments are particularly advantageously applied to vibration control dampers that are used by being inserted into through-holes in acoustic equipment such as component audio equipment, car audio equipment, record players, speakers, and precision equipment.

Reference Signs List 1 damper body 1a, 1b end surface 1c outer peripheral surface 1d annular groove 1e hole 2 first standing wall 21 first portion 22 second portion 23 third portion 3 neck 4 head 41 first first Part 42 Second part 5 Reinforcing part 6 Second standing wall 61 Fourth part 62 Fifth part 63 Sixth part 10 Damping damper 10a Tip end 10b Base end 10A Damping damper 70 80 damping damper, A center axis, R1, R2, R3 radius, T thickness, W1, W2, W3, W4, W5, W6, W7 width.

Claims (4)

A vibration control damper made of rubber,
a damper body extending in an axial direction along the central axis of the vibration damper and having an end face in the axial direction;
It stands along the axial direction from the end surface toward the tip of the vibration damper, and radially extends from the central axis along the radial direction orthogonal to the axial direction in plan view. and a plurality of first standing walls,
The first vertical wall has a first portion connected to the end face, a second portion connected to an end of the first portion opposite to the end face in the axial direction, and a a first portion and a third portion connected to an opposite end of the second portion;
the width of the first portion in the radial direction is smaller than the width of the second portion in the radial direction;
the width of the third portion in the radial direction decreases with increasing distance from the second portion;
The thickness of the first standing wall decreases toward the tip along the axial direction,
The vibration damper, wherein Tan δ of the rubber is 0.25 or more. 2. The vibration damping according to claim 1, further comprising a reinforcing portion connected to said two first standing walls and said end face adjacent to each other in a circumferential direction, which is a direction along a circumference centered on said central axis. damper. Further comprising a plurality of second standing walls standing from the end face toward the tip along the axial direction and radially extending from the central axis along the radial direction in a plan view,
The second vertical wall is between the two first vertical walls adjacent in the circumferential direction, which is the direction along the circumference centered on the central axis,
The second vertical wall has a fourth portion connected to the end face, a fifth portion connected to an end of the fourth portion opposite to the end face in the axial direction, and a a fourth portion and a sixth portion connected to an opposite end of the fifth portion;
the width of the fourth portion in the radial direction is smaller than the width of the fifth portion in the radial direction;
The width of the sixth portion in the radial direction decreases with increasing distance from the fifth portion,
The radial width of the sixth portion is smaller than the radial width of the third portion at positions where the distance along the axial direction from the tip is the same. vibration damper. 4. The vibration damper according to claim 3, further comprising a reinforcing portion connected to said first standing wall and said second standing wall adjacent to each other in said circumferential direction and said end face.

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