JP5847281B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator, and more particularly to a vibration isolator capable of preventing water from entering the inside of an inner cylindrical member and preventing a decrease in fastening force.

  A cylindrical inner cylinder member, a cylindrical outer cylinder member disposed at a position surrounding the inner cylinder member from the outer peripheral side, and a connection between the outer peripheral surface of the inner cylindrical member and the inner peripheral surface of the outer cylindrical member are connected. In addition, an anti-vibration device including an anti-vibration base composed of a rubber-like elastic body is used, for example, in an automobile suspension device.

  In this vibration isolator, a bolt is inserted into the inner cylinder member, and the inner cylinder member is clamped and fixed to the mating member while being clamped by the mating member from both sides in the axial direction, but the axial end surface of the inner cylinder member is If it is smooth, there is a risk of relative slippage between the inner cylinder member and the mating member. Therefore, a technique for preventing relative slip between the inner cylinder member and the counterpart member by providing a serration-like projection (serration projection) on the axial end surface of the inner cylinder member and pressing the projection against the counterpart member. It has been known.

  On the other hand, when the serrated projection is provided on the axial end surface of the inner cylinder member in this way, the projection cannot be completely immersed in the mating member, so there is a gap between the trough between the projection and the mating member. Arise. For this reason, rusting occurs on the bolt due to water that has entered the inside of the inner cylinder member from the gap, and there is a risk that durability will be reduced.

  Therefore, Patent Document 1 discloses a technique of filling a seal rubber between serrated projections. According to this, when the inner cylinder member is fastened and fixed in a state where the projection is pressed against the mating member, the gap formed between the valley between the projection and the mating member is closed by the seal rubber and sealed in a watertight manner. Water intrusion into the inside of the cylindrical member can be reduced. As a result, rusting of the bolt can be prevented and durability can be ensured.

Japanese Patent Laying-Open No. 2005-337473 (FIG. 1, paragraph [00224], etc.)

  However, as in the above-described anti-vibration device, when the gap formed between the valley between the protrusions and the mating member is closed by the seal rubber filled between the protrusions, the seal rubber due to the influence of time or ultraviolet rays, etc. As the sealing property deteriorates, there is a problem in that the ingress of water cannot be sufficiently reduced because the sealing performance is lowered. Further, since the seal rubber is fastened with the bolt in a state where the seal rubber is interposed between the axial end surface of the inner cylinder member and the mating member, there is a problem that when the seal rubber is deteriorated, the fastening force is reduced.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a vibration isolator capable of preventing water from entering the inside of the inner cylindrical member and preventing a decrease in fastening force. .

Means for Solving the Problems and Effects of the Invention

  According to the vibration isolator of the first aspect, since the serration projections arranged in a radial straight line project from the axial end surface of the inner cylindrical member, the inner cylindrical member is opposed to the mating member from both axial sides. When fastened and fixed in the sandwiched state, the serration protrusion is pressed against the mating member, and relative slippage between the inner cylinder member and the mating member is prevented.

In this case, the inner cylindrical member Since comprises a watertight protrusion forming the walls continuous to the axial end face with serration projections in the circumferential direction while being projected from the axial end surface, the inside of the inner cylindrical member, the circumferential direction It can be isolated from the outside by a continuous wall. As a result, there is an effect that water can be prevented from entering the inside of the inner cylinder member.

Here, since the watertight projection is integrally projected from the axial end surface of the inner cylinder member, it is possible to suppress deterioration due to aging or the influence of ultraviolet rays. Therefore, since the rigidity of the watertight projection can be ensured, there is an effect that it is possible to prevent water from entering the inside of the inner cylinder member and prevent a decrease in fastening force over a long period of time.
In addition, the serration protrusion is narrowed as the protruding tip surface approaches the watertight protrusion, and is formed to have the smallest width at the connection portion with the watertight protrusion, so that the surface density on the axial end surface of the inner cylinder member is uniform. Can be achieved. As a result, when the axial end surface of the inner cylinder member is sandwiched between the mounting plates MP, the surface pressure at the projecting tip surface of both the projections and the like is made uniform, and these both projections are evenly applied to the mounting plate. It can be immersive.

  According to the vibration isolator according to claim 2, in addition to the effect of the vibration isolator according to claim 1, the watertight protrusion protrudes from the end face in the axial direction with a protrusion height equal to or lower than the protrusion height of the serration protrusion. Therefore, even when there are variations in the projecting height or the flatness of the mating member due to dimensional tolerances, the serration protrusion is securely pressed against the mating member, and the relative relationship between the inner cylinder member and the mating member There is an effect that the general slip can be suppressed.

  According to the vibration isolator of claim 3, in addition to the effect of the vibration isolator according to claim 1 or 2, the watertight protrusion is a serration protrusion in a state in which the axial end surface of the inner cylinder member is viewed in the axial direction. The circular watertight projections are arranged in an elliptical shape or a circular shape that is eccentric with respect to the axis while intersecting with the circular watertight projections, so that the circular watertight projections are not only used as walls for preventing water intrusion. Moreover, it can be made to function also as a site | part for preventing the slip generate | occur | produced between an inner cylinder member and a counterpart member. That is, by providing the circular watertight protrusions, not only can water be prevented from entering the inside of the inner cylinder member, but also the effect of preventing slippage between the inner cylinder member and the counterpart member can be further enhanced.

  Further, since the circular watertight protrusions are provided so as to intersect with the serration protrusions, the rigidity of both the serration protrusions and the circular watertight protrusions as a whole can be increased. As a result, the entire serration projection and the circular watertight projection can be reliably brought into pressure contact with the mating member, so that water intrusion and slippage can be prevented more reliably.

  According to the vibration isolator according to claim 4, in addition to the effect of the vibration isolator according to claim 1 or 2, the watertight protrusion is connected to the serration protrusion while being intermittent in the circumferential direction, and Since the staggered watertight protrusions arranged in a staggered manner are provided on the outer peripheral side of the first row and connected to the serration protrusions intermittently in the circumferential direction, the staggered watertight protrusions can be dispersed. Therefore, when both the serration protrusion and the staggered watertight protrusion are pressed against the mating member, the deformed portions of the mating member due to the press-contact can be dispersed. As a result, the entire protrusions of the serration protrusion and the staggered watertight protrusion can be reliably brought into pressure contact with the mating member, so that water intrusion and slippage can be prevented more reliably.

It is sectional drawing which shows the mounting state of the vibration isolator in 1st Embodiment of this invention. (A) is a top view of a vibration isolator, (b) is sectional drawing of the vibration isolator in the IIb-IIb line | wire of Fig.2 (a). (A) is a top view of the axial end surface of the inner cylinder member as viewed from the axial direction, and (b) is an enlarged view of a part of the axial end surface of the inner cylinder member shown in FIG. It is a partial enlarged top view. (A) is sectional drawing of the inner cylinder member in the IVa-IVa line of FIG.3 (b), (b) is sectional drawing of the inner cylinder member in the IVb-IVb line of FIG.3 (b). (A) is a top view of the axial direction end surface when the inner cylinder member in 2nd Embodiment is seen from an axial direction, (b) is an axial direction of the inner cylinder member 0 shown to Fig.5 (a). It is a partial enlarged top view which expands and shows a part of end surface. (A) is sectional drawing of the inner cylinder member in the VIa-VIa line of FIG.5 (b), (b) is sectional drawing of the inner cylinder member in the VIb-VIb line of FIG.5 (b). (A) is a top view of the axial direction end surface when the inner cylinder member in 3rd Embodiment is seen from an axial direction, (b) is an axial direction end surface of the inner cylinder member shown to Fig.7 (a). It is a partial enlarged top view which expands and shows a part of. (A) is sectional drawing of the inner cylinder member in the VIIIa-VIIIa line | wire of FIG.7 (b), (b) is sectional drawing of the inner cylinder member in the VIIIb-VIIIb line | wire of FIG.7 (b). It is a top view of the axial direction end surface at the time of seeing the inner cylinder member in a 4th embodiment from the axial direction. (A) And (b) is sectional drawing of the inner cylinder member in 5th Embodiment. (A) And (b) is sectional drawing of the inner cylinder member in 6th Embodiment. (A) is a partial expanded top view which expands and shows a part of axial direction end surface of the inner cylinder member in 7th Embodiment, (b) is an axial direction of the inner cylinder member in 8th Embodiment. It is a partial enlarged top view which expands and shows a part of end surface. (A) is a partial enlarged top view which expands and shows a part of axial direction end surface of the inner cylinder member in 9th Embodiment, (b) is an axial direction of the inner cylinder member in 10th Embodiment. It is a partial enlarged top view which expands and shows a part of end surface.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a mounted state of the vibration isolator 1 according to the first embodiment of the present invention. 2A is a top view of the vibration isolator 1, and FIG. 2B is a cross-sectional view of the vibration isolator 1 taken along line IIb-IIb in FIG. 2A.

  As shown in FIGS. 1 and 2, the vibration isolator 1 is a bush attached to a suspension mechanism (suspension mechanism) of an automobile, and includes an inner cylinder member 10 formed in a cylindrical shape having an axis O from a steel material. The outer cylinder member 20 is disposed concentrically with the inner cylinder member 10 and is formed in a cylindrical shape from a steel material, and the outer peripheral surface of the inner cylinder member 10 and the inner peripheral surface of the outer cylinder member 20 are connected to each other. In this embodiment, the anti-vibration base 30 made of a rubber-like elastic body is interposed between the suspension arm SA and the pair of mounting plates MP on the vehicle body side.

  That is, the vibration isolator 1 presses and fixes the outer cylinder member 20 in the press-fitting portion of the suspension arm SA in the axial direction, and bolts are inserted into the inner cylinder member 10 from the insertion hole of one mounting plate MP (right side in FIG. 1). B is inserted, and a nut N is screwed into a male screw portion of the bolt B protruding from the insertion hole of the other mounting plate MP (left side in FIG. 1) and tightened, and axially (see FIG. 1) between the pair of mounting plates MP. (Right and left direction) The inner cylinder member 10 is fastened and fixed while being clamped from both sides, so that it is mounted on the suspension mechanism.

  Here, the vibration isolator 1 has a serration protrusion 13 and a watertight protrusion 14 protruding from the axial end surface of the inner cylinder member 10 (see FIGS. 3 and 4). Therefore, when the inner cylinder member 10 is fastened and fixed in a state of being sandwiched between the pair of mounting plates MP from both sides in the axial direction, the serration protrusion 13 is pressed against the mounting plate MP, and the inner cylinder member 10 and the mounting plate MP are It is possible to prevent relative slippage between them.

  In this case, in this embodiment, when the watertight protrusion 14 is pressed against the mounting plate MP, a wall continuous in the circumferential direction is formed on the axial end surface of the inner cylinder member 10, and the interior of the inner cylinder member 10 is formed. (Space through which the bolt B is inserted) is blocked from the outside. Thereby, it can prevent that water penetrate | invades into the inside of the inner cylinder member 10 from between the axial direction end surface of the inner cylinder member 10, and the attachment board MP. As a result, rusting of the bolt B can be prevented and durability can be secured.

  Next, a detailed configuration of the inner cylinder member 10 will be described with reference to FIGS. 3 and 4. 3A is a top view of the axial end surface of the inner cylinder member 10 viewed from the direction of the axis O, and FIG. 3B is a top view of the axial end surface of the inner cylinder member 10 shown in FIG. It is a partial expanded top view which expands and shows a part. 4A is a cross-sectional view of the inner cylinder member 10 taken along line IVa-IVa in FIG. 3B, and FIG. 4B is an inner cylinder taken along line IVb-IVb in FIG. 3B. 3 is a cross-sectional view of a member 10. FIG.

  In addition, since the shape in the axial direction end surface of the inner cylinder member 10 is the same shape on both sides, only the shape of the axial end surface on one side will be described, and the description of the shape of the axial end surface on the other side will be omitted.

  As shown in FIGS. 3 and 4, the inner cylinder member 10 is formed by chamfering chamfered portions 11 and 12 formed by chamfering a corner portion on the inner peripheral side and a corner portion on the outer peripheral side, and an axial end surface. And serration projections 13 and watertight projections 14 formed integrally with the inner cylinder member 10.

  In addition, since the inner cylinder member 10 is provided with chamfered portions 11 and 12 at each of the corner portions on the inner peripheral side and the outer peripheral side, molding is performed when the serration protrusion 13 and the watertight protrusion 14 are protruded from the axial end surface by press working. It is possible to improve the property, and it is possible to ensure the adhesion when the protrusions 13 and 14 are brought into pressure contact with the mounting plate MP (see FIG. 1).

  As shown in FIG. 3, a plurality of serration protrusions 13 are arranged at equal intervals in the circumferential direction (that is, arranged in a radial straight line with the axis O as the center when viewed in the direction of the axis O) (in the present embodiment). As shown in FIG. 4B, each protrusion is directed from the base side (the lower side in FIG. 4B) to the projecting tip side (the upper side in FIG. 4B). It is formed as a protrusion having a substantially triangular shape in cross section.

  As shown in FIG. 4A, each of the protrusions constituting the serration protrusion 13 is inclined with the same inclination angle as that of the chamfered portion 12 at the end face located on the axis O side (the left side face in FIG. 4A). It continues to the chamfer 12. As shown in FIG. 4B, each protrusion has a protruding tip surface having a width t1 and a flat surface perpendicular to the axis O, and protruding from the base side at a protruding height h1. Is done.

  As shown in FIG. 3, the watertight protrusion 14 is formed in a circular shape centered on the axis O when viewed in the direction of the axis O, and ends of the protrusions constituting the serration protrusion 13 are formed on the inner peripheral side of the circular shape. Each is connected. Further, as shown in FIG. 4A, the watertight protrusion 14 has a substantially triangular cross section that tapers from the base side (lower side in FIG. 4A) toward the protruding tip side (upper side in FIG. 4A). It is formed as a shape protrusion.

  As shown in FIG. 4A, the watertight protrusion 14 has a side surface (right side surface in FIG. 4A) located on the opposite side (the outer peripheral side of the inner cylinder member 10) with respect to the axis O and the chamfered portion 11. It continues to the chamfer 11 while inclining at the same inclination angle. In addition, as shown in FIG. 4A, the watertight protrusion 14 has a protruding tip surface having a width t2 and a flat surface perpendicular to the axis O, and protruding from the base side at a protruding height h2. Established.

  Here, in the present embodiment, the protruding height h2 of the watertight protrusion 14 is the same as the protruding height h1 of the serration protrusion 13 (h1 = h2). Therefore, the projecting tip surface of the watertight projection 14 coincides with a plane including the tip surface of each projection constituting the serration projection 13. Further, the width t2 of the projecting tip surface of the watertight projection 14 is the same as the width t1 of the projecting tip surface of the serration projection 13 (t1 = t2). Therefore, both the protrusions 13 and 14 can be immersed into the mounting plate MP evenly.

  As described above, according to the vibration isolator 1 in the present embodiment, the serration protrusions 13 that are arranged in a radial straight line with respect to the axis O are provided on the end surface in the axial direction of the inner cylinder member 10. When each protrusion of the protrusion 13 is in pressure contact with the mounting plate MP (see FIG. 1), the projecting tip portion of each protrusion is immersed in the mounting plate MP, so that the inner cylinder member 10 and the mounting plate MP Relative slippage between the two can be prevented.

  In this case, a watertight protrusion 14 that is formed in a circular shape as viewed in the direction of the axis O is also provided on the axial end surface of the inner cylinder member 10. Therefore, when the watertight projection 14 is pressed against the mounting plate MP (see FIG. 1), the projecting tip portion of the watertight projection 14 is immersed into the mounting plate MP, so that the axial end surface of the inner cylinder member 10 is reached. A wall continuous in the circumferential direction can be formed between the mounting plate MP and the mounting plate MP.

  Since the inside of the inner cylinder member 10 can be blocked from the outside by this wall, the intrusion of water into the inner cylinder member 10 can be reduced. As a result, the shaft of the bolt B (see FIG. 1) The rusting of the part can be suppressed and the durability can be improved.

  Here, for example, in a case where the gap is closed with a seal rubber filled between the protrusions to prevent the intrusion of water into the inner cylindrical member, if the seal rubber deteriorates due to the influence of time or ultraviolet rays, The fastening force is reduced. On the other hand, in the vibration isolator 1, the watertight protrusion 14 is integrally formed on the axial end surface of the inner cylinder member 10, that is, formed of a steel material, so that deterioration due to the influence of time or ultraviolet rays is avoided. Since the rigidity of the watertight protrusion 14 can be secured, it is possible to prevent water from entering the inner cylinder member 10 and prevent a decrease in fastening force due to the bolt B (see FIG. 1) over a long period of time.

  Further, the projecting height h2 of the watertight projection 14 is the same size as the projecting height h1 of the serration projection 13, so the projecting heights h1 and h2 and the mounting plate MP (see FIG. 1) due to dimensional tolerances. Even when there is a variation in the flatness of the inner cylindrical member 10, when the axial end surface of the inner cylinder member 10 is sandwiched between the mounting plates MP, the projecting tip portions of the projections of the serration projections 13 are attached to the mounting plate MP. It is possible to ensure the effect of suppressing the relative slip between the inner cylinder member 10 and the mounting plate MP by reliably immersing (biting in).

  Further, since the end portions of the protrusions constituting the serration protrusion 13 are connected to the watertight protrusion 14, the rigidity of both the watertight protrusion 14 and the serration protrusion 13 as a whole can be increased. As a result, when the serration protrusion 13 and the watertight protrusion 14 are pressed against the mounting plate MP, the protruding tip portion can be surely immersed (bite in) the mounting plate MP. Occurrence can be prevented more reliably.

  Next, the inner cylinder member 210 in the second embodiment will be described with reference to FIGS. 5 and 6. In the first embodiment, the case where the watertight protrusions 14 are arranged in a circular shape on the axial end surface of the inner cylinder member 10 has been described. However, the inner cylinder member 210 in the second embodiment has staggered watertight protrusions 214. Arranged in a staggered pattern along the circumferential direction. In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 5A is a top view of an axial end surface when the inner cylinder member 210 in the second embodiment is viewed from the direction of the axis O, and FIG. 5B is an inner view shown in FIG. FIG. 4 is a partially enlarged top view showing a part of an axial end surface of a cylindrical member 210 in an enlarged manner. 6A is a cross-sectional view of the inner cylinder member 210 taken along line VIa-VIa in FIG. 5B, and FIG. 6B is an inner cylinder taken along line VIb-VIb in FIG. 5B. 4 is a cross-sectional view of a member 210. FIG.

  In addition, since the shape in the axial direction end surface of the inner cylinder member 210 is the same shape on both sides, only the shape of the axial end surface on one side will be described, and the description of the shape of the axial end surface on the other side will be omitted.

  As shown in FIGS. 5 and 6, the inner cylinder member 210 includes serration protrusions 13 and staggered watertight protrusions 214 that are formed integrally with the inner cylinder member 210 by pressing the end face in the axial direction. The serration protrusions 13 are the same as those in the first embodiment except that the staggered watertight protrusions 214 are connected (intersected) to each other, and the description thereof is omitted.

  The staggered watertight projection 214 includes an inner circumferential projection row 214a composed of a projection group disposed on the inner circumferential side, and an outer circumferential projection row 214b composed of a projection group disposed closer to the outer circumferential side than the inner circumferential projection row 214a. These two protrusion rows 214a and 214b are formed in a staggered pattern when viewed in the direction of the axis O.

  Specifically, the protrusions of the inner peripheral protrusion row 214a are arranged at every other position between the protrusions of the serration protrusions 13 arranged at equal intervals in the circumferential direction when viewed in the direction of the axis O. 214b is disposed at every other position between the protrusions of the serration protrusion 13 while shifting the phase in the circumferential direction by one position from the position where the inner peripheral protrusion row 214a is disposed.

  That is, between the protrusions constituting the serration protrusion 13, there are alternately the places where the protrusions of the inner peripheral protrusion row 214 a are arranged and the places where they are not arranged on the inner circumference side. Also on the outer peripheral side, locations where the projections of the outer peripheral projection row 214b are arranged and locations where the projections are not arranged alternately exist in the circumferential direction, and locations where the projections of the inner peripheral projection row 214a are arranged (serration projections) 13 between the protrusions 13), the protrusions of the outer peripheral protrusion row 214b are not disposed, and the protrusions of the outer peripheral protrusion row 214b are disposed at positions where the protrusions of the inner peripheral protrusion row 214a are not disposed.

  As shown in FIG. 5, the protrusions of the inner peripheral protrusion row 214a and the protrusions of the outer peripheral protrusion row 214b are end portions of the protrusions constituting the serration protrusion 13 (ends on the inner peripheral side). Or an end on the outer peripheral side). Therefore, both the protrusions 13 and 214 form a closed shape. That is, on the end surface in the axial direction of the inner cylinder member 210, a wall continuous in the circumferential direction is formed by the serration protrusion 13 and the staggered watertight protrusion 214.

  As shown in FIG. 6A, the staggered watertight protrusion 214 has protrusions protruding from the base side (lower side in FIG. 6A) such that the protrusions in the inner peripheral protrusion line 214a and the protrusions in the outer peripheral protrusion line 214b protrude from the base side. It is formed as a protrusion having a substantially triangular cross section that tapers toward the side (upper side in FIG. 6A).

  As shown in FIG. 6A, the protrusion on the inner peripheral protrusion row 214a has a side surface (left side surface in FIG. 6A) located on the axis O side (the inner peripheral side of the inner cylinder member 210) as the chamfered portion 12. The protrusions of the outer peripheral protrusion row 214b are inclined at the same inclination angle as that of the outer peripheral side protrusion row 214b, and the protrusions on the side opposite to the axis O (the outer peripheral side of the inner cylindrical member 210) are shown in FIG. ) Continues to the chamfered portion 11 while being inclined at the same inclination angle as the chamfered portion 11.

  Further, as shown in FIG. 6A, the protrusions of the inner peripheral protrusion row 214a have a protruding tip surface having a width t21 and a flat surface perpendicular to the axis O, and protruding from the base side. The protrusion on the outer peripheral side protrusion row 214b protrudes at a height h21 and has a protrusion tip surface having a width t22 and a flat surface perpendicular to the axis O, and protrudes from the base side at a protrusion height h22. Established.

  Here, in the present embodiment, the protrusion heights h21 and h22 of the protrusions of the inner peripheral protrusion row 214a and the protrusions of the outer peripheral protrusion row 214b are the same as the protrusion height h1 of the serration protrusion 13. (H1 = h21 = h22). Therefore, the projecting tip surfaces of the staggered watertight projections 214 (the projections of the inner circumferential projection row 214a and the projections of the outer circumferential projection row 214b) coincide with the plane including the tip surfaces of the projections constituting the serration projection 13.

  Further, the width t21 of the protruding tip surface of the protrusion on the inner peripheral projection row 214a and the width t22 of the protruding tip surface of the protrusion on the outer peripheral projection row 214b are the same dimensions as the width t1 of the protruding tip surface of the serration projection 13. (T1 = t21 = t22). Therefore, each protrusion 13, 214a, 214b can be evenly immersed (bite in) into the mounting plate MP.

  As described above, according to the vibration isolator of the present embodiment, the inner cylinder member 10 and the mounting plate MP (see FIG. 1) are caused by the protrusions of the serration protrusion 13 as in the case of the first embodiment. Relative slippage between the two can be prevented.

  In this case, a staggered watertight protrusion 214 is provided on the end surface of the inner cylinder member 210 in the axial direction. The staggered watertight protrusion 214 has a closed shape (a wall continuous in the circumferential direction) together with the serration protrusion 13. Form. Therefore, when the serration protrusions 13 and the staggered watertight protrusions 214 are pressed against the mounting plate MP (see FIG. 1), and the protruding tip portions of both the protrusions 13 and 214 are immersed in the mounting plate MP (intrusion), the inner cylinder A wall continuous in the circumferential direction can be formed between the axial end surface of the member 210 and the mounting plate MP.

  Since this wall can block the inside of the inner cylinder member 210 from the outside, it is possible to reduce the intrusion of water into the inside of the inner cylinder member 210. As a result, the shaft of the bolt B (see FIG. 1) The rusting of the part can be suppressed and the durability can be improved.

  Here, the staggered watertight protrusion 214 is integrally formed on the axial end surface of the inner cylindrical member 210, that is, formed of a steel material, so that deterioration due to the influence of time or ultraviolet rays is avoided and rigidity is ensured. Is done. Therefore, as in the case of the first embodiment, it is possible to prevent water from entering the inside of the inner cylinder member 210 and prevent a decrease in fastening force due to the bolt B (see FIG. 1) over a long period of time.

  Further, the projecting heights h21 and h22 of the staggered watertight projection 214 are the same size as the projecting height h1 of the serration projection 13, so that the dimensional variation occurs as in the case of the first embodiment. Even if it is, the protrusion tip part of each protrusion which comprises the serration protrusion 13 is surely immersed in the attachment board MP (it bites in), and the relative slip between the inner cylinder member 210 and the attachment board MP is suppressed. The certainty of the effect can be achieved.

  Further, the staggered watertight projections 214 (the projections of the inner circumferential projection row 214a and the projections of the outer circumferential projection row 214b) are connected to the projections constituting the serration projection 13 at both ends, respectively. The rigidity of both the watertight projection 214 and the serration projection 13 as a whole can be increased. Therefore, as in the case of the first embodiment, the protruding tip portions of the serration protrusion 13 and the staggered watertight protrusion 214 can be surely immersed (bite in) the mounting plate MP, and water intrusion and slippage can be prevented. Occurrence can be prevented more reliably.

  Here, the staggered watertight protrusion 214 in the present embodiment is located on the outer peripheral side with respect to the inner peripheral protrusion row 214a connected to the serration protrusion 13 while being intermittently connected in the circumferential direction, and to the inner peripheral protrusion row 214a. Since they are arranged in a zigzag manner from the outer peripheral projection row 214b connected to the serration projection 13 while being intermittent in the circumferential direction, the projections constituting the zigzag watertight projection 214 can be dispersedly arranged.

  Therefore, when the serration protrusions 13 and the staggered watertight protrusions 214 are pressed against the mating member, the deformed portions of the mounting plate MP (see FIG. 1) due to the pressure contact can be dispersed. Since each of the protrusions constituting the watertight protrusion 214 can be surely immersed in (inserted into) the mounting plate MP, water can enter the inner cylindrical member 210, and the inner cylindrical member 210 and the mounting plate MP. Can be more reliably prevented from occurring.

  Next, the inner cylinder member 310 according to the third embodiment will be described with reference to FIGS. In the first embodiment, the case where the watertight protrusion 14 is circularly arranged on the axial end surface of the inner cylinder member 10 has been described. However, the inner cylinder member 310 in the third embodiment has an elliptical shape on the axial end surface thereof. Watertight protrusions 314 are arranged in an elliptical shape. In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 7A is a top view of an axial end face when the inner cylinder member 310 in the third embodiment is viewed from the direction of the axis O, and FIG. 7B is an inner view shown in FIG. FIG. 4 is a partially enlarged top view showing a part of an axial end surface of a cylindrical member 310 in an enlarged manner. 8A is a cross-sectional view of the inner cylinder member 310 taken along line VIIIa-VIIIa in FIG. 7B, and FIG. 8B is an inner cylinder taken along line VIIIb-VIIIb in FIG. 7B. 3 is a cross-sectional view of a member 310. FIG.

  In addition, since the shape in the axial direction end surface of the inner cylinder member 310 is the same shape on both sides, only the shape of the axial end surface on one side will be described, and the description of the shape of the axial end surface on the other side will be omitted.

  As shown in FIGS. 7 and 8, the inner cylinder member 310 includes serration protrusions 13 and elliptical watertight protrusions 314 that are formed integrally with the inner cylinder member 310 by pressing the end surface in the axial direction. The serration protrusions 13 are the same as those in the first embodiment except that the portions where the elliptical watertight protrusions 314 are connected (intersected) are different, and the description thereof is omitted.

  As shown in FIG. 7, the elliptical watertight protrusion 314 is formed in an elliptical shape when viewed in the direction of the axis O. This elliptical shape is such that the intersection of the major axis and the minor axis is located on the axis O, the major axis coincides with the outer peripheral diameter of the serration protrusion 13, and the minor axis coincides with the inner peripheral diameter of the serration protrusion 13. It is assumed.

  As described above, the elliptical watertight protrusion 314 continues in the circumferential direction while intersecting (connecting) with each protrusion constituting the serration protrusion 13 as shown in FIG. Accordingly, both the protrusions 13 and 314 form a closed shape. That is, on the end surface in the axial direction of the inner cylinder member 310, a wall continuous in the circumferential direction is formed by the serration protrusion 13 and the elliptical watertight protrusion 314.

  Here, as shown in FIG. 8A, the elliptical watertight projection 314 has a cross section that tapers from the base side (lower side in FIG. 8A) toward the projecting tip side (upper side in FIG. 8A). It is formed as a substantially triangular protrusion.

  As shown in FIG. 7A, the elliptical watertight projection 314 is formed on the opposite side (the outer periphery of the inner cylinder member 310) with respect to the axis O of the portion located on the long axis (the left and right portions in FIG. 8A). The side surface located on the side) is connected to the chamfered portion 11 while being inclined at the same inclination angle as that of the chamfered portion 11, and the portion on the short axis (the upper and lower portions in FIG. 8A) on the axis O side (inside A side surface located on the inner peripheral side of the cylindrical member 310 is connected to the chamfered portion 12 while being inclined at the same inclination angle as the chamfered portion 12.

  Further, as shown in FIG. 8A, the elliptical watertight protrusion 314 has a protruding tip surface having a width t3 and a flat surface perpendicular to the axis O, and has a protruding height h3 from the base side. Projected. In the present embodiment, the protruding height h3 of the elliptical watertight protrusion 314 is the same as the protruding height h1 of the serration protrusion 13 (h1 = h3). Therefore, the protruding front end surface of the elliptical watertight protrusion 314 coincides with a plane including the front end surface of each protrusion constituting the serration protrusion 13.

  Further, the width t3 of the projecting tip surface of the elliptical watertight projection 314 is the same as the width t1 of the projecting tip surface of the serration projection 13 (t1 = t3). Therefore, both the protrusions 13 and 314 can be evenly immersed in the mounting plate MP.

  As described above, according to the vibration isolator of the present embodiment, the inner cylinder member 310 and the mounting plate MP (see FIG. 1) are formed by the protrusions of the serration protrusion 13 as in the case of the first embodiment. Relative slippage between the two can be prevented.

  In this case, an elliptical watertight protrusion 214 protrudes from the axial end surface of the inner cylinder member 310, and the elliptical watertight protrusion 314 forms a closed shape (a wall continuous in the circumferential direction) together with the serration protrusion 13. . Therefore, when the serration protrusion 13 and the elliptical watertight protrusion 314 are pressed against the mounting plate MP (see FIG. 1), and the projecting tip portions of both the protrusions 13 and 314 are immersed into the mounting plate MP (intrusion), the inner cylinder member A wall continuous in the circumferential direction can be formed between the axial end surface of 310 and the mounting plate MP.

  Since this wall can block the inside of the inner cylinder member 310 from the outside, it is possible to reduce the intrusion of water into the inside of the inner cylinder member 310. As a result, the shaft of the bolt B (see FIG. 1) The rusting of the part can be suppressed and the durability can be improved.

  Here, the elliptical watertight protrusion 314 is integrally formed on the axial end surface of the inner cylinder member 310, that is, formed of a steel material, so that deterioration due to the influence of time or ultraviolet rays is avoided, and rigidity is ensured. The Therefore, as in the case of the first embodiment, it is possible to prevent water from entering the inside of the inner cylinder member 310 and prevent a decrease in fastening force due to the bolt B (see FIG. 1) over a long period of time.

  In addition, since the protruding height h3 of the elliptical watertight protrusion 314 has the same dimension as the protruding height h1 of the serration protrusion 13, when the dimension variation occurs as in the case of the first embodiment. However, the projecting tip portion of each protrusion constituting the serration protrusion 13 is surely immersed (bited in) into the mounting plate MP, and the effect of suppressing the relative slip between the inner cylinder member 310 and the mounting plate MP. Certainty can be achieved.

  In addition, since the elliptical watertight protrusion 314 intersects (connects) with each of the protrusions constituting the serration protrusion 13, the rigidity of both the elliptical watertight protrusion 214 and the serration protrusion 13 as a whole can be increased. Therefore, as in the case of the first embodiment, the protruding tip portions of the serration protrusion 13 and the elliptical watertight protrusion 314 can be reliably immersed (bite into) the mounting plate MP, and water intrusion and slippage can occur. Can be more reliably prevented.

  Here, since the elliptical watertight protrusion 314 in the present embodiment is formed in an elliptical shape, the elliptical watertight protrusion 314 is not only used as a wall for preventing water from entering, but also the inner cylinder member 310 and the mounting plate. It can function also as a part for preventing the slip generated between MP. That is, the provision of the elliptical watertight projection 314 not only prevents water from entering the inside of the inner cylinder member 310 but also further enhances the effect of preventing slippage between the inner cylinder member 310 and the mounting plate MP. it can.

  Next, the inner cylinder member 410 according to the fourth embodiment will be described with reference to FIG. In the first embodiment, the case where the circular watertight protrusions 14 are arranged concentrically with respect to the inner cylinder member 10 when viewed in the direction of the axis O has been described. In the inner cylinder member 410 according to the fourth embodiment, The circular watertight protrusion 414 is arranged eccentrically with respect to the inner cylinder member 410. In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 9 is a top view of an axial end face when the inner cylinder member 410 according to the fourth embodiment is viewed from the axis O direction. In addition, since the shape in the axial direction end surface of the inner cylinder member 410 is the same shape on both sides, only the shape of the axial end surface on one side will be described, and the description of the shape of the axial end surface on the other side will be omitted.

  As shown in FIG. 9, the inner cylinder member 410 includes serration protrusions 13 and circular watertight protrusions 414 that are formed integrally with the inner cylinder member 410 by pressing the end face in the axial direction. The serration protrusions 13 are the same as those in the first embodiment except that the circular watertight protrusions 414 are connected (intersected) at different points, and the description thereof is omitted.

  As shown in FIG. 9, the circular watertight protrusion 414 is formed in a perfect circle shape when viewed in the direction of the axis O. This perfect circular shape is eccentrically positioned with respect to the axis O of the inner cylinder member 410, and one side (right side in FIG. 9) is in contact with the outer peripheral portion of the serration protrusion 13, and the other side (left side in FIG. 9) is serrated. The size is in contact with the inner periphery of the protrusion 13.

  The circular watertight protrusion 414 has the same configuration as that of the elliptical watertight protrusion 314 in the third embodiment except for the point that the shape of the circular watertight protrusion 414 is different when viewed in the direction of the axis O. Therefore, the description thereof is omitted.

  Also in the vibration isolator in this Embodiment, there can exist an effect similar to the vibration isolator 1 in 1st Embodiment. In this case, since the circular circular watertight protrusion 414 is arranged eccentrically, the circular watertight protrusion 414 is not only used as a wall for preventing water from entering, but also between the inner cylinder member 410 and the mounting plate MP. It can be made to function also as a part for preventing the generated slip. That is, the provision of the circular watertight protrusion 414 not only prevents water from entering the inside of the inner cylinder member 410 but also further enhances the effect of preventing slippage between the inner cylinder member 410 and the mounting plate MP. it can.

  Next, with reference to FIGS. 10 and 11, inner cylinder members 510 and 610 in the fifth embodiment and the sixth embodiment will be described. In the first embodiment, the case where the serration protrusion 13 and the watertight protrusion 14 are formed at the same protrusion height has been described, but the watertight protrusion 14 in the fifth and sixth embodiments is the serration protrusion. It is formed with different projecting height. In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the description is abbreviate | omitted.

  FIGS. 10A and 10B are cross-sectional views of the inner cylinder member 510 in the fifth embodiment, and FIGS. 11A and 11B are inner cylinders in the sixth embodiment. 6 is a cross-sectional view of a member 610. FIG. 10 (a) and 11 (a) correspond to FIG. 4 (a), and FIGS. 10 (b) and 11 (b) correspond to FIG. 4 (b).

  As shown in FIGS. 10 and 11, the inner cylinder member 510 in the fifth embodiment includes serration protrusions 13 and watertight protrusions 514, and the inner cylinder member 610 in the sixth embodiment includes serration protrusions 13 and watertightness. And a protrusion 614. Since these watertight protrusions 514 and 516 have the same configuration as the watertight protrusion 14 in the first embodiment except for the cross-sectional shape thereof, description thereof will be omitted.

  In the watertight protrusion 514 in the fifth embodiment, the width t5 of the protruding tip surface is the same as the width t1 of the protruding tip surface of the serration protrusion 13 (t1 = t5), while the protruding height h5 is The height of the serration protrusion 13 is smaller than the height h1 (h5 <h1). That is, the cross-sectional shape of the watertight projection 514 in the fifth embodiment is the same as the chamfered portion 11 on the side surface (the right side surface in FIG. 10A) located on the opposite side (the outer peripheral side of the inner cylinder member 510) with respect to the axis O. The cross-sectional shape of the watertight projection 14 shown in FIG. 4A is set to be retreated downward (downward in FIG. 10A) while maintaining a state where the tilt angles are continuous.

  Further, in the watertight protrusion 614 in the sixth embodiment, the width t6 of the protruding tip surface is larger than the width t1 of the protruding tip surface of the serration protrusion 13 (t1 <t6), and the protruding height The length h6 is set to be smaller than the protruding height h1 of the serration protrusion 13 (h6 <h1). That is, the cross-sectional shape of the watertight protrusion 614 in the sixth embodiment is a shape in which the tip surface portion of the cross-sectional shape of the watertight protrusion 14 shown in FIG.

  As described above, in the fifth embodiment and the sixth embodiment, the projecting heights h5 and h6 of the watertight projections 514 and 614 are smaller than the projecting height h1 of the serration projection 13. Even when the projecting heights h1, h5, h6 and the flatness of the mounting plate MP (see FIG. 1) vary due to dimensional tolerances, the axial end surfaces of the inner cylindrical members 510, 610 are attached to the mounting plate MP ( When sandwiched between the protrusions 13 (see FIG. 1), the protruding tip portions of the protrusions of the serration protrusions 13 can be surely immersed (bite into) the mounting plate MP. Therefore, it is possible to ensure the effect of suppressing the relative slip between the inner cylinder members 510 and 610 and the mounting plate MP.

  In this case, when the dimensional difference in the protruding height between the serration protrusion 13 and the watertight protrusion is set to be relatively small, as in the fifth embodiment, on the protruding tip surface of the watertight protrusion 514. The width t5 is preferably set to the same dimension as the width t1 on the protruding tip surface of the serration protrusion 13, or smaller than the width t1 on the protruding tip surface of the serration protrusion 13. If the dimensional difference between the projecting heights is relatively small, it is assumed that the projecting tip portion of the watertight projection 514 needs to be immersed in the mounting plate MP (see FIG. 1). It is because it is easy to do (easy to bite in).

  On the other hand, when the dimensional difference in the protruding height between the serration protrusion 13 and the watertight protrusion is set to be relatively large, the width t6 at the protruding tip end surface of the watertight protrusion 614 is set as in the sixth embodiment. It is preferable that the dimension is larger than the width t1 of the protruding tip surface of the serration protrusion 13. When the dimensional difference in the projecting height is relatively large, it is assumed that the projecting tip portion of the watertight projection 514 cannot be sufficiently immersed in the mounting plate MP (see FIG. 1). This is because the watertightness can be ensured by increasing the contact area between the protruding front end surface and the mounting plate MP.

  Next, with reference to FIG. 12, inner cylinder members 710 and 810 in the seventh embodiment and the eighth embodiment will be described. In the first embodiment, the case where the projecting tip surfaces of the serration protrusion 13 and the watertight protrusion 14 are formed with a constant width (width t1, t2) along the extending direction (longitudinal direction) has been described. The serration projections 713, 813 and the watertight projections 714, 814 in the seventh and eighth embodiments are formed so that the width of the projecting tip end surface is partially narrowed at least at the connection portion of both the projections 713, 714, etc. Is done. In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 12A is a partially enlarged top view showing a part of the axial end surface of the inner cylindrical member 710 in the seventh embodiment in an enlarged manner, and FIG. 12B is an inner view in the eighth embodiment. FIG. 6 is a partially enlarged top view showing a part of an axial end surface of a cylindrical member 810 in an enlarged manner. FIGS. 12A and 12B correspond to FIG. 3B.

  In addition, since the shape in the axial direction end surface of the inner cylinder members 710 and 810 is the same shape on both sides, only the shape of the axial end surface on one side will be described, and the description of the shape of the axial end surface on the other side will be omitted. To do.

  The inner cylinder member 710 in the seventh embodiment includes serration protrusions 713 and watertight protrusions 714, and the inner cylinder member 810 in the eighth embodiment includes serration protrusions 813 and watertight protrusions 14.

  In this case, the serration protrusion 713 and the watertight protrusion 714 in the seventh embodiment have the same configuration as the serration protrusion 13 and the watertight protrusion 14 in the first embodiment, respectively, except that the recess 715 is provided. The serration protrusion 813 in the eighth embodiment has the same configuration as the serration protrusion 13 in the first embodiment except that the width of the protruding tip surface changes along the longitudinal direction. Therefore, in the present embodiment, description of these detailed configurations is omitted.

  As shown in FIG. 12A, the inner cylinder member 710 according to the seventh embodiment includes a pair of recessed portions 715 that have a recessed connection portion between the serration protrusion 713 and the watertight protrusion 714. The concave notches 715 are provided on both sides of the connecting portion of the two protrusions 713 and 714, and are recessed from the respective inner corners to the inside, thereby partially denting both the protrusions 713 and 714. Missing. By this recess, the width of the projecting tip surface is partially narrowed in both the serration projection 713 and the watertight projection 714. The recess 715 is formed in a shape that is curved in an arc shape when viewed in the direction of the axis O.

  As shown in FIG. 12B, the inner cylinder member 810 according to the eighth embodiment has one end side in the longitudinal direction in which the protruding front end surface of the serration protrusion 813 is the inner peripheral side of the inner cylinder member 810 (FIG. b) In the left side, the width is formed to the maximum width ta, and the width is narrowed toward the watertight protrusion 814, and the minimum width tb is formed at the connection portion with the watertight protrusion 814 (tb <ta). In addition, as for the protrusion front end surface of the serration protrusion 813, both sides (FIG.12 (b) upper side and lower side) are formed in linear form.

  As described above, in the seventh embodiment, when the axial end surface of the inner cylindrical member 710 is viewed from the direction of the axis O, the portion where the surface density of the projecting tip surfaces of both the protrusions 713 and 714 increases (both protrusions By recessing the recessed portion 715 in the connecting portion of 713, 714), the surface density of the projecting tip surfaces of the protrusions 713, 714 on the axial end surface of the inner cylinder member 710 can be made uniform as a whole. . Also in the eighth embodiment, the inner cylindrical member 810 is narrowed by narrowing the width of the projecting tip surface of the serration projection 813 on the side of the connection portion with the watertight projection 814 (that is, the portion where the surface density is increased). It is possible to make the surface density uniform in the axial end face. As a result, when the axial end surfaces of the inner cylinder members 710 and 810 are sandwiched between the mounting plates MP (see FIG. 1), the surface pressure on the projecting tip surfaces of both the protrusions 713 and 714 and the like is made uniform as a whole. Thus, both the protrusions 713 and 714 can be uniformly immersed in the mounting plate MP.

  Next, with reference to FIG. 13, inner cylinder members 910 and 1010 in the ninth embodiment and the tenth embodiment will be described. As in the case of the seventh embodiment and the eighth embodiment described above, the serration protrusions 913, 1013 and the elliptical watertight protrusions 914, 1014 in the ninth embodiment and the tenth embodiment have at least both protrusions 913, It is formed so that the width of the projecting tip surface is partially narrowed at the connecting portion such as 914. In addition, the same code | symbol is attached | subjected about the part same as 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 13A is a partially enlarged top view showing an enlarged part of the axial end surface of the inner cylinder member 910 in the ninth embodiment, and FIG. 13B is an inner view in the tenth embodiment. FIG. 6 is a partially enlarged top view showing a part of an axial end surface of a cylindrical member 1010 in an enlarged manner. 13A and 13B correspond to FIG. 3B.

  In addition, since the shape in the axial direction end surface of the inner cylinder members 910 and 1010 is the same shape on both sides, only the shape of the axial end surface on one side will be described, and the description of the shape of the axial end surface on the other side will be omitted. To do.

  The inner cylinder member 910 in the ninth embodiment includes a serration protrusion 913 and an elliptical watertight protrusion 914, and the inner cylinder member 1010 in the eighth embodiment includes a serration protrusion 1013 and an elliptical watertight protrusion 314.

  In this case, the serration projection 913 and the elliptical watertight projection 914 in the ninth embodiment have the same configuration as the serration projection 13 and the elliptical watertight projection 314 in the third embodiment, respectively, except that the concave portion 915 is provided. In addition, the serration protrusion 1013 in the tenth embodiment is the same as the serration protrusion 13 in the first embodiment (third embodiment) except that the width of the protruding tip surface changes along the longitudinal direction. It is the composition. Therefore, in the present embodiment, description of these detailed configurations is omitted.

  As shown in FIG. 13A, the inner cylinder member 910 according to the ninth embodiment includes concave notches 915 that are notched at four locations where the serration projection 913 and the elliptical watertight projection 914 are connected. The concave notches 915 are provided at four locations of the connecting portions (intersections) of the two protrusions 913 and 914, and are recessed from the respective inner corners to the inside, so that a part of both the protrusions 913 and 914 is provided. Is partially recessed. Due to this recess, the width of the projecting tip surface is partially narrowed in both the serration projection 913 and the elliptical watertight projection 914.

  The recess 915 is formed in a shape that is curved in an arc shape when viewed in the direction of the axis O. Further, the widths of the projecting leading end surfaces of both the protrusions 913 and 914 and the widths of the portions notched by the notched portions 915 are set to the same size at each of the four locations. As a result, the press mold for forming both protrusions 913 and 914 partially wears on the axial end surface of the inner cylinder member 910 (that is, wear of the mold part that forms a portion with a narrow width of the protrusion precedes). ) Can be suppressed and the lifetime can be improved.

  As shown in FIG. 13B, the inner cylinder member 1010 according to the tenth embodiment has one end side in the longitudinal direction in which the protruding tip surface of the serration protrusion 1013 is the inner peripheral side of the inner cylinder member 1010 (FIG. 13 ( b) is formed at the maximum width tc at the other end side in the longitudinal direction (the upper right side in FIG. 13B) which is the outer peripheral side of the inner cylinder member 1010, and the width becomes narrower as it approaches the elliptical watertight projection 314. Thus, a minimum width td is formed at the connection portion with the elliptical watertight protrusion 314 (td <tc). In FIG. 13B, the dimensions are shown only on the other end side of the serration protrusion 1013 divided by the elliptical watertight protrusion 314. Moreover, both sides of the protruding tip end surface of the serration protrusion 1013 are linearly formed.

  As described above, also in the ninth embodiment and the tenth embodiment, the surface density of the projecting tip surface is made uniform as a whole, as in the seventh embodiment and the eighth embodiment. Can do. Therefore, when the axial end surfaces of the inner cylinder members 910 and 1010 are sandwiched between the mounting plates MP (see FIG. 1), the surface pressure on the projecting tip surfaces of both the protrusions 913 and 914 and the like is made uniform throughout. These protrusions 913 and 914 can be uniformly immersed (bite into) the mounting plate MP.

  The present invention has been described above based on the embodiments. However, the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. It can be easily guessed.

  The numerical values described in the above embodiments are merely examples, and other numerical values can naturally be adopted. For example, the number of serration protrusions 13 formed is an example, and it is naturally possible to set the number of serration protrusions 13 to be increased or decreased from the 36 exemplified above. For example, the dimension value of the width t1 of the serration protrusion 13 and the width t2 of the watertight protrusion 14 may be zero. These apply to each protrusion of each of the above embodiments.

  The magnitude relationship between the components described in the above embodiments is merely an example, and other relationships can naturally be adopted. For example, although the case where the width t1 of the serration protrusion 13 and the width t2 of the watertight protrusion 14 are set to the same dimension has been described, one of the widths may be larger than the other width. Further, for example, the width of some of the protrusions constituting the serration protrusion 13 may be different from the width of other protrusions. These apply to each protrusion of each of the above embodiments.

  In each of the above-described embodiments, the case where the shapes of the inner cylindrical members 10 to 1010 on the axial end surface are the same on both sides has been described. However, the shape is not necessarily limited to this, and the shape on the axial end surface is one and On the other hand, it is naturally possible to have different shapes (shapes in different embodiments). The projections described in the above embodiments may be provided only on one axial end surface, while the other axial end surface may be formed as a flat surface without providing a projection.

  Although each said embodiment demonstrated the case where the chamfering parts 11 and 12 were formed in the corner | angular part of the inner peripheral side and outer peripheral side of the inner cylinder members 10-1010, it is not necessarily restricted to this, The chamfering part 11 , 12 may be omitted.

  In the first embodiment, the case where the watertight projection 14 is connected to the outermost peripheral end portion of the serration projection 13 has been described. However, the present invention is not necessarily limited to this, and is connected to the innermost peripheral end portion. Or they may be connected between them (that is, the watertight protrusion 14 is arranged so as to intersect the serration protrusion 13).

  In the first embodiment, the case where the watertight protrusion 14 is connected to the serration protrusion 13 has been described. However, the present invention is not necessarily limited to this, and the watertight protrusion 14 may not be connected to the serration protrusion 13. That is, if only the watertight projection 14 forms a circumferentially continuous shape, the outer peripheral end (or inner peripheral end) of the serration projection 13 and the inner peripheral side surface of the watertight projection 14 (or A gap may be provided between the outer peripheral side surface and the outer peripheral side surface.

  In the second embodiment, the case where the protrusions constituting the inner peripheral protrusion row 214a and the outer peripheral protrusion row 214b of the staggered watertight protrusion 214 are curved in an arc shape centering on the axis O is described. However, the present invention is not necessarily limited to this, and it is naturally possible to form a part or all of these protrusions in a straight line. In addition, making each protrusion into a straight line shape is applicable to each protrusion in other embodiments.

  In the second embodiment, the projections constituting the inner circumferential projection row 214a and the outer circumferential projection row 214b of the staggered watertight projection 214 are arranged at every other position between the projections of the serration projection 13. However, the present invention is not necessarily limited to this, and some or all of them may be arranged every two places, or may be arranged every three or more places. That is, it is only necessary to form a continuous shape (closed shape) in the circumferential direction by the protrusions of the staggered watertight protrusion 214 and the protrusions of the serration protrusion 13.

  In the second embodiment, the inner circumferential projection row 214 a of the staggered watertight projection 214 is connected to the innermost circumferential end of the serration projection 13 and the outer circumferential projection row 214 b is the outermost circumference side of the serration projection 13. However, the present invention is not necessarily limited to this, and both the protrusion rows 214a and 214b are connected to the innermost periphery of the serration protrusion 13 or a position separated from the outermost end. May be.

  In the third embodiment, the case where the elliptical watertight protrusion 314 is formed in an elliptical shape has been described. However, the present invention is not necessarily limited to this, and may be in an elliptical shape, for example. Even if it is this shape, the reinforcement effect of the relative slip between attachment plate MP can be acquired.

  In the fourth embodiment, the case where the circular watertight protrusions 414 formed in a perfect circle shape are eccentrically arranged is not limited to this. For example, an ellipse shape or an elliptical shape is eccentrically arranged. You may do it. Even if it is this shape, the reinforcement effect of the relative slip between attachment plate MP can be acquired.

  In the fifth embodiment and the sixth embodiment, the case where the projecting height h2 of the watertight projection 14 is changed has been described by taking the first embodiment as an example. It is naturally possible to apply to the embodiment. That is, in this case, the relationship between the serration protrusion 13 and the watertight protrusions 514 and 614 is the same as that between the serration protrusion 13 and the staggered watertight protrusion 214 in the second embodiment, and the serration in the third embodiment. The relationship between the projection 13 and the elliptical watertight projection 314, the relationship between the serration projection 13 and the circular watertight projection 414 in the fourth embodiment, and the serration projection 713, 813 and the watertight projection in the seventh and eighth embodiments. In the eighth and ninth embodiments, the relationship between the serration projections 913 and 1013 and the elliptical watertight projections 914 and 314 is respectively applied to the relationship with 714 and 14.

In the eighth embodiment and the ninth embodiment, the case where both sides of the projecting tip surfaces of the serration protrusions 813 and 1013 are formed in a straight line has been described. However, the present invention is not limited to this. Of course, it is possible to make a part or all of the both sides of the projecting tip face of 813, 1013 into a curved shape.
<Others>
<Means>
The vibration isolator of the technical idea 1 includes an inner cylinder member formed in a cylindrical shape having serration protrusions that are integrally projected from an axial end surface and arranged in a radial straight line, and the inner cylinder member formed in a cylindrical shape. An outer cylindrical member disposed at a position surrounding the outer peripheral side of the inner cylindrical member; The inner cylinder member is clamped to the mating member from both sides in the axial direction, and is fastened and fixed in a state where the serration protrusion is pressed against the mating member, and the inner cylinder member is integrated from the axial end surface. And a watertight protrusion which forms a wall continuous in the circumferential direction alone or together with the serration protrusion on the axial end face.
The anti-vibration device of the technical idea 2 is the anti-vibration device of the technical idea 1, wherein the watertight protrusion is protruded from the end surface in the axial direction with a protrusion height equal to or lower than the protrusion height of the serration protrusion. .
The vibration isolator of the technical idea 3 is the vibration isolator of the technical idea 1 or 2, wherein the watertight protrusion intersects the serration protrusion in a state where the axial end surface of the inner cylinder member is viewed in the axial direction. A circular watertight projection is provided which is arranged in an elliptical shape or a circular shape which is eccentric with respect to the axis.
The vibration isolator of the technical idea 4 is the vibration isolator of the technical idea 1 or 2, wherein the watertight protrusion is connected to the serration protrusion while being intermittently connected in the circumferential direction, and from the first row Are also provided on the outer peripheral side and provided with staggered watertight protrusions arranged in a staggered manner with the second row connected to the serration protrusions intermittently in the circumferential direction.
<Effect>
According to the vibration isolator described in the technical idea 1, since the serration protrusions arranged in a radial straight line project from the axial end surface of the inner cylindrical member, the inner cylindrical member is opposed to the counterpart member from both axial sides. When fastened and fixed in a state of being sandwiched between the two, the serration protrusion is pressed against the mating member, and relative sliding between the inner cylinder member and the mating member is prevented.
In this case, the inner cylindrical member is provided with a watertight protrusion that protrudes from the axial end face and forms a wall that is continuous with the serration protrusion alone or in the circumferential direction on the axial end face. A wall continuous in the direction can be cut off from the outside. As a result, there is an effect that water can be prevented from entering the inside of the inner cylinder member.
Here, since the watertight projection is integrally projected from the axial end surface of the inner cylinder member, it is possible to suppress deterioration due to aging or the influence of ultraviolet rays. Therefore, since the rigidity of the watertight projection can be ensured, there is an effect that it is possible to prevent water from entering the inside of the inner cylinder member and prevent a decrease in fastening force over a long period of time.
According to the vibration isolator described in the technical idea 2, in addition to the effect exhibited by the vibration isolator described in the technical idea 1, the watertight protrusion has an axial end face with a protruding height equal to or lower than the protruding height of the serration protrusion. Therefore, even if there are variations in the projecting height, flatness of the mating member, etc. due to dimensional tolerances, the serration protrusion is securely pressed against the mating member, so that there is no gap between the inner cylinder member and the mating member. There is an effect that it is possible to suppress the relative slippage.
According to the vibration isolator described in the technical idea 3, in addition to the effect exhibited by the vibration isolator described in the technical idea 1 or 2, the watertight projection is in a state where the axial end surface of the inner cylindrical member is viewed in the axial direction. Since it has a circular watertight protrusion arranged in an elliptical shape or a circular shape that is eccentric with respect to the axis while intersecting with the serration protrusion, the circular watertight protrusion is only used as a wall for preventing water from entering. Instead, it can also function as a portion for preventing slippage between the inner cylinder member and the counterpart member. That is, by providing the circular watertight protrusions, not only can water be prevented from entering the inside of the inner cylinder member, but also the effect of preventing slippage between the inner cylinder member and the counterpart member can be further enhanced.
Further, since the circular watertight protrusions are provided so as to intersect with the serration protrusions, the rigidity of both the serration protrusions and the circular watertight protrusions as a whole can be increased. As a result, the entire serration projection and the circular watertight projection can be reliably brought into pressure contact with the mating member, so that water intrusion and slippage can be prevented more reliably.
According to the vibration isolator described in the technical idea 4, in addition to the effect exhibited by the vibration isolator described in the technical idea 1 or 2, the watertight protrusion is connected to the serration protrusion while being intermittent in the circumferential direction. And staggered watertight protrusions arranged in a staggered manner on the outer peripheral side of the first row and connected to the serration protrusions while being intermittently connected in the circumferential direction. it can. Therefore, when both the serration protrusion and the staggered watertight protrusion are pressed against the mating member, the deformed portions of the mating member due to the press-contact can be dispersed. As a result, the entire protrusions of the serration protrusion and the staggered watertight protrusion can be reliably brought into pressure contact with the mating member, so that water intrusion and slippage can be prevented more reliably.

DESCRIPTION OF SYMBOLS 1 Anti-vibration apparatus 10,210,310,410,510,610,710,810,910,1010 Inner cylinder member 13,713,813,913,1013 Serration protrusion O Axis 20 Outer cylinder member 30 Anti-vibration base MP Mounting plate (Parts)
14,514,614,714 Watertight protrusion 314,914 Elliptic watertight protrusion (circular watertight protrusion, watertight protrusion)
414 Circular watertight protrusion (circular watertight protrusion, watertight protrusion)
214 Staggered watertight protrusion (watertight protrusion)
214a Inner circumferential projection row (first row of staggered watertight projections)
214b Outer peripheral projection row (second row of staggered watertight projections)
h1 Projection height of serration projections h2, h5, h6 Projection height of watertight projections h21 Projection height of inner circumferential projection rows h22 Projection height of outer circumferential projection rows h3 Projection height of elliptical watertight projections t1 Width of projected tip surface of serration projection t2, t5, t6 Width of projected tip surface of watertight projection t21 Width of projected tip surface of inner circumferential projection row t22 Width of projected tip surface of outer circumferential projection row t3 Width of protruding tip surface of elliptical watertight protrusion

Claims (4)

An inner cylinder member formed in a cylindrical shape having serration protrusions that are integrally projected from an axial end surface and arranged in a radial straight line, and a position that is formed in a cylindrical shape and surrounds the outer peripheral side of the inner cylinder member. And an anti-vibration base that connects between the outer peripheral surface of the inner cylindrical member and the inner peripheral surface of the outer cylindrical member, and is formed of a rubber-like elastic body. In the vibration isolator which is clamped and fixed in a state where the serration protrusion is pressed against the mating member while being clamped by the mating member from both sides,
The inner cylinder member is provided with a watertight protrusion forming the axial end face wall circumferentially continuous with prior Symbol serration protrusion on the axial end face while being integrally projecting from,
The anti-vibration device according to claim 1, wherein the serration protrusion is formed to have a minimum width at a connecting portion with the water-tight protrusion, and the width of the serrated protrusion is reduced as the protruding front end surface approaches the water-tight protrusion.   The anti-vibration device according to claim 1, wherein the watertight protrusion protrudes from the axial end surface at a protrusion height equal to or lower than a protrusion height of the serration protrusion.   The watertight protrusion is a circular watertight protrusion disposed in an elliptical shape or a circular shape positioned eccentric to the axis while intersecting with the serration protrusion in a state where the axial end surface of the inner cylindrical member is viewed in the axial direction. The vibration isolator according to claim 1 or 2, further comprising: The watertight protrusions are connected to the serration protrusions while being intermittent in the circumferential direction, and the second lines are located on the outer peripheral side of the first row and connected to the serration protrusions while being intermittent in the circumferential direction. The anti-vibration device according to claim 1, further comprising staggered watertight protrusions arranged in a staggered manner.

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