JP2012032000A - Stopper and vibration damping bushing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a vibration damping bushing in a stopper and the vibration damping bushing.SOLUTION: The stopper 6 of the vibration damping bushing 1 is disposed on the axial end face of an inner cylinder body 2, and includes a disk section 60 where a through hole 60a that penetrates a part corresponding to the hollow section 20 of the inner cylinder body 2 in its thickness direction is formed, and an annular rubber ring section 61 that is provided on the outer peripheral surface of a bottom face in the disk section 60 and is disposed on the periphery of the axial end face in the inner cylinder body 2. A vent hole 62 is formed at the ring section 61 whose bottom face and outer peripheral surface are opened to allow the bottom face side to mutually communicate with the outer peripheral surface side. The vent hole 62 is opened at the inner peripheral surface of the ring section 61.

Description

  The present invention relates to a stopper and a vibration-proof bush provided with the stopper.

  The anti-vibration bush is used, for example, as a suspension bush for an automobile, and attenuates vibrations of the wheels when the vehicle travels.

  The anti-vibration bush of Patent Document 1 includes an inner cylindrical body, an outer cylindrical body provided around the inner cylindrical body, and a rubber elastic body that is provided between the two cylindrical bodies and connects the two cylindrical bodies to each other. And a bush main body. The inner cylinder body is bolted and fixed to the bracket on the vehicle body side by a bolt inserted into the hollow portion. The outer cylinder is press-fitted and fixed in the cylinder portion of the suspension link. Further, annular rubber stoppers are respectively fitted on both ends of the inner cylinder in the axial direction in order to restrict relative movement of both cylinders in the axial direction.

JP 2006-125449 A

  In the vibration isolating bushing, the stopper is disposed with little or no gap between the outer cylinder and the cylinder portion of the suspension link in order to reliably limit the relative movement of both cylinders in the axial direction. Therefore, heat tends to be trapped inside the rubber elastic body, such as in a straight portion formed on the end surface in the cylinder axial direction of the rubber elastic body. This heat adversely affects the durability of the anti-vibration bush.

  This invention is made | formed in view of this point, The place made into the objective is to improve the durability of an anti-vibration bush.

  A first invention is a bush main body having an inner cylindrical body, an outer cylindrical body provided around the inner cylindrical body, and a rubber elastic body provided between the two cylindrical bodies and connecting the two cylindrical bodies to each other. A stopper for restricting relative movement in the axial direction of the two cylinders, which is fitted around at least one end of the inner cylinder in the vibration isolating bush. Is disposed on the axial end surface of the inner cylindrical body, a disk-shaped disk portion in which a through hole penetrating in the thickness direction is formed in a portion corresponding to the hollow portion of the inner cylinder, and provided on the outer peripheral side of the bottom surface of the disk portion, An annular rubber ring portion disposed around the axial end portion of the inner cylinder, and the ring portion is opened at the bottom surface and the outer peripheral surface, and the bottom surface side and the outer peripheral surface side are formed. A vent hole communicating with each other is formed, and the vent hole is opened on the inner peripheral surface of the ring portion. It is an butterfly.

  As a result, a vent hole is formed in the ring portion at the bottom surface and the outer peripheral surface so as to communicate the bottom surface side and the outer peripheral surface side with each other, so that air flows inside and outside the rubber elastic body through the vent hole. . Therefore, the heat inside the rubber elastic body can be released, and the durability of the vibration-proof bushing can be improved.

  According to a second aspect of the present invention, in the first aspect of the invention, the vent hole has a substantially truncated fan shape as viewed from the bottom of the ring and extends from the inner side to the outer side in the ring radial direction. The ring has a substantially half mountain shape in cross-sectional view that expands toward the disk portion as it goes.

  When the vent hole is configured in this manner, the air flow through the vent hole inside and outside the rubber elastic body is promoted due to its structure. Therefore, the heat inside the rubber elastic body can be surely released, and the durability of the vibration-proof bushing can be reliably improved.

  According to a third aspect of the present invention, in the first aspect of the present invention, the vent hole extends from the inner side to the outer side in the radial direction of the ring and expands to opposite sides in the ring circumferential direction. The first and second vent holes are alternately arranged in the circumferential direction of the ring, and the first and second vent holes have a substantially rectangular shape in cross section of the ring. It is characterized by being.

  When the vent hole is configured in this manner, the air flow through the vent hole inside and outside the rubber elastic body is promoted due to its structure. Specifically, when a torsional load is applied to the rubber elastic body around the cylinder axis direction, air is sucked into the rubber elastic body from the outside through one of the first and second vent holes, and the other The air is exhausted from the inside of the rubber elastic body to the outside through the. Therefore, the heat inside the rubber elastic body can be surely released, and the durability of the vibration-proof bushing can be reliably improved.

  According to a fourth aspect of the present invention, there is provided a bushing body having an inner cylindrical body, an outer cylindrical body provided around the inner cylindrical body, and a rubber elastic body provided between the two cylindrical bodies and connecting the two cylindrical bodies to each other. A stopper for restricting relative movement in the axial direction of the two cylinders, which is fitted around at least one end of the inner cylinder in the vibration isolating bush. Is disposed on the axial end surface of the inner cylindrical body, a disk-shaped disk portion in which a through hole penetrating in the thickness direction is formed in a portion corresponding to the hollow portion of the inner cylinder, and provided on the outer peripheral side of the bottom surface of the disk portion, An annular rubber ring portion disposed around the axial end portion of the inner cylinder, and the ring portion is opened at the bottom surface and the outer peripheral surface, and the bottom surface side and the outer peripheral surface side are formed. Vent holes communicating with each other are formed, and the vent holes are not opened on the inner peripheral surface of the ring portion, and In the ring bottom view, which expands to one side in the ring circumferential direction as it goes from the inner side to the outer side in the radial direction, and in the shape of a ring half in the ring radial direction, which extends to the disk part side as it goes to the other side in the ring circumferential direction, and The ring has a substantially half-mountain shape in a cross-sectional view of the ring that expands toward the disk portion side from the inner side to the outer side in the ring radial direction.

  As a result, a vent hole is formed in the ring portion at the bottom surface and the outer peripheral surface so as to communicate the bottom surface side and the outer peripheral surface side with each other, so that air flows inside and outside the rubber elastic body through the vent hole. . Therefore, the heat inside the rubber elastic body can be released, and the durability of the vibration-proof bushing can be improved.

  Further, since the vent hole is not opened on the inner peripheral surface of the ring portion, the inner peripheral surface of the ring portion becomes a continuous surface, and the stopper can be prevented from falling off from the inner cylinder.

  Furthermore, when the vent hole is configured as described above, the air flow through the vent hole inside and outside the rubber elastic body is promoted due to its structure. Therefore, the heat inside the rubber elastic body can be surely released, and the durability of the vibration-proof bushing can be reliably improved.

  According to a fifth invention, in any one of the first to fourth inventions, two, three, or four vent holes are formed at equal intervals in the ring circumferential direction. Is.

  As a result, two, three, or four ventilation holes are formed at equal intervals in the ring circumferential direction, so that the heat inside the rubber elastic body can be surely compared with the case where one ventilation hole is formed. Therefore, the durability of the anti-vibration bush can be reliably improved.

  Moreover, since two, three, or four ventilation holes are formed at equal intervals in the ring circumferential direction, the structural strength of the ring portion of the stopper can be improved as compared with the case where a large number of ventilation holes are formed. And the stopper can be prevented from falling out of the inner cylinder.

  Furthermore, if four vent holes are formed at equal intervals in the ring circumferential direction, the vent holes are arranged in a balanced manner in the ring portion. Therefore, the heat inside the rubber elastic body can be surely released, and the durability of the vibration-proof bushing can be reliably improved.

  According to a sixth aspect of the present invention, there is provided a bushing body having an inner cylindrical body, an outer cylindrical body provided around the inner cylindrical body, and a rubber elastic body provided between the two cylindrical bodies and connecting the two cylindrical bodies to each other. And an anti-vibration bush provided with at least one end of the inner cylinder in the axial direction, and a stopper for restricting relative movement of the two cylinders in the axial direction. Is the stopper according to any one of the first to sixth inventions.

  Thereby, the effect | action and effect similar to any one of 1st-6th invention are acquired.

  According to the present invention, the ring portion is formed with a vent hole that opens at the bottom surface and the outer peripheral surface and communicates the bottom surface side and the outer peripheral surface side with each other. Therefore, the heat inside the rubber elastic body can be released and the durability of the vibration isolating bush can be improved.

It is sectional drawing of the anti-vibration bush which concerns on embodiment of this invention. It is a figure which shows a bush main body, (a) is a top view of a bush main body, (b) is the II-II arrow directional cross-sectional view of (a). It is a figure which shows a stopper, (a) is a bottom view of a stopper, (b) is the III-III sectional view taken on the line of (a). It is a figure which shows a stopper, (a) is a bottom view of a stopper, (b) is the IV-IV arrow directional cross-sectional view of (a). It is a figure which shows a stopper, (a) is a bottom view of a stopper, (b) is the VV arrow directional cross-sectional view of (a). It is a figure which shows a stopper, (a) is a bottom view of a stopper, (b) is a side view of a stopper.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
An anti-vibration bush 1 according to an embodiment of the present invention is used as a bush for a front suspension of an automobile, and attenuates vibrations of the wheels when the vehicle travels. As shown in FIGS. 1 to 3, the anti-vibration bush 1 includes a hollow cylindrical metal inner cylinder 2 and a hollow cylindrical shape provided coaxially with the inner cylinder 2 on the outer periphery of the inner cylinder 2. A bush body 5 having a metal outer cylinder 3 and a rubber elastic body 4 provided between the cylinders 2 and 3 and connecting the cylinders 2 and 3 to each other, and both axial ends of the inner cylinder 2 Each part is provided with a stopper 6 that is fitted around the rubber elastic body 4 on the outer periphery thereof.

  The inner cylinder 2 is longer in the axial direction than the outer cylinder 3, and both axial ends protrude from the outer cylinder 3. The outer diameters at both axial ends of the inner cylinder 2 are constant after increasing from the inner side to the outer side in the axial direction. The inner cylinder 2 is bolted and fixed together with the stoppers 6 and 6 to the bracket (not shown) on the vehicle body side by bolts (not shown) inserted into the hollow portion 20 and the through holes 60a and 60a of the stoppers 6 and 6. Has been. The outer cylinder 3 is press-fitted and fixed in a cylinder portion 7 (shown only in FIG. 1) of the front suspension link. On both end surfaces in the cylinder axial direction of the rubber elastic body 4, straight portions (grooves) 40 that extend continuously over the entire circumference in the cylinder circumferential direction are formed.

  Each of the stoppers 6 is disposed on the axial end surface of the inner cylindrical body 2, and is made of a disk-shaped metal having a through hole 60a penetrating in the thickness direction in a central portion corresponding to the hollow portion 20 of the inner cylindrical body 2 ( For example, an aluminum rubber disc 60 is fixed to the outer peripheral side of the disc portion 60 and the bottom surface of the disc portion 60 (the surface on the bush body 5 side). Ring part 61.

  Four air holes 62 are formed in the ring portion 61 at equal intervals in the circumferential direction, which are open at the bottom surface (the surface on the bush body 5 side) and the outer peripheral surface and communicate with the bottom surface side and the outer peripheral surface side. . Each of the vent holes 62 is not opened on the inner peripheral surface of the ring portion 61, and has a substantially truncated fan shape (the tip is cut off) that expands to both sides of the ring circumferential direction from the inner side to the outer side in the ring radial direction. It has a substantially half-mountain shape (quarter-circle shape) in a cross-sectional view in the ring cross section that expands toward the disk part 60 side (the upper surface side of the ring part 61) as it goes from the inner side to the outer side in the ring radial direction. That is, the depth of the vent hole 62 (the length in the ring thickness direction) becomes shallower (shorter) from the center of the vent hole 62 in the ring circumferential direction toward both sides. The inner surface of each vent hole 62 is curved toward the disk portion 60 side in a ring cross-sectional view. Each vent 62 is formed by cutting the ring portion 61.

  On the bottom surface of the ring portion 61, a groove 64 extending over the entire circumference in the circumferential direction is formed in a portion corresponding to the outer cylindrical body 3. The groove 64 is interrupted at a portion where the vent hole 62 is provided.

  The stopper 6 is in contact with the outer cylinder 3, the cylinder portion 7 of the front suspension link, and the bracket on the vehicle body side, so that the relative movement in the axial direction of both the cylinders 2 and 3 is restricted.

  By the way, in the anti-vibration bush 1, in order to restrict | limit the relative movement of the axial direction of both the cylinders 2 and 3 reliably, there is almost or no gap between the stopper 6 and the outer cylinder 3 or the cylinder part 7 of the front suspension link. It is arranged without. Therefore, if no measures are taken, heat is likely to stay inside the rubber elastic body 4 such as the inside of the straight portion 40. This heat adversely affects the durability of the vibration isolating bush 1.

  Therefore, in the present embodiment, the vent hole 62 is formed in the ring portion 61 as described above. Air circulates inside and outside the rubber elastic body 4 through the vent hole 62. Therefore, the heat inside the rubber elastic body 4 can be released (see the arrow in FIG. 1), and the durability of the vibration isolating bush 1 can be improved.

  Since four vent holes 62 are formed at equal intervals in the ring circumferential direction, the heat inside the rubber elastic body 4 can be surely released as compared with the case where one vent hole is formed. 1 can be reliably improved.

  Further, since four vent holes 62 are formed at equal intervals in the ring circumferential direction, the structural strength of the ring portion 61 of the stopper 6 can be improved as compared with the case where a large number of vent holes are formed. 6 can be prevented from falling out of the inner cylindrical body 2.

  Furthermore, if four vent holes 62 are formed at equal intervals in the circumferential direction of the ring, the vent holes 62 are arranged on the ring portion 61 in a well-balanced manner. Therefore, the heat inside the rubber elastic body 4 can be surely released, and the durability of the vibration isolating bush 1 can be improved with certainty.

  Since the air holes 62 are not opened on the inner peripheral surface of the ring portion 61, the inner peripheral surface of the ring portion 61 is a continuous surface, and the stopper 6 can be reliably prevented from falling off the inner cylindrical body 2.

  In addition, according to the stopper 6 of this embodiment, the relative movement of the axial direction of both the cylindrical bodies 2 and 3 can be restrict | limited like a conventional one.

(Embodiment 2)
In the present embodiment, the vent hole 62 has a shape having a fan effect. Hereinafter, this point will be described.

  As shown in FIG. 4, the air holes 62 have first and second shapes that are substantially U-shaped (boomerang) as viewed from the bottom of the ring and expand from the inner side toward the outer side in the ring radial direction. It has pores 62a and 62b. That is, each of the first and second vent holes 62a and 62b gradually expands from the inner side to the outer side in the ring radial direction when viewed from the bottom of the ring, and then expands rapidly. The first and second vent holes 62a and 62b are alternately arranged two by two at substantially equal intervals in the ring circumferential direction. Each of the first and second vent holes 62a and 62b opens at the inner peripheral surface of the ring portion 61 and penetrates from the outer peripheral surface side to the inner peripheral surface side of the ring portion 61, and passes through the ring portion 61 in the entire thickness direction. By cutting out over the ring, the ring cross-sectional view is substantially rectangular. The other points are almost the same as in the first embodiment.

  If the vent hole 62 is configured as described above, the circulation of air inside and outside the rubber elastic body 4 through the vent hole 62 is promoted due to its structure. Specifically, when a torsional load centering on the cylinder axis direction acts on the rubber elastic body 4, it functions like an electric fan, and the first and second vent holes 62a as shown by the arrows in FIG. 62b, air is sucked from the outside to the inside of the rubber elastic body 4 through one (first vent 62a in FIG. 4A), and the other (second vent 62b in FIG. 4A). The air is exhausted from the inside of the rubber elastic body 4 to the outside through the. Therefore, the heat inside the rubber elastic body 4 can be surely released, and the durability of the vibration isolating bush 1 can be improved with certainty. Note that which of the first and second vent holes 62a and 62b is the intake port and which is the exhaust port depends on the torsional rotation direction.

(Embodiment 3)
In the present embodiment, the shape of the vent hole 62 is different from that of the first embodiment. Hereinafter, this difference will be described.

  As shown in FIG. 5, each air hole 62 opens on the inner peripheral surface of the ring portion 61 and communicates the outer peripheral surface side and the inner peripheral surface side of the ring portion 61, and from the inner side to the outer side in the ring radial direction. The ring has a substantially truncated fan shape as viewed from the bottom of the ring as it goes to the ring circumferential direction, and a substantially half mountain shape (triangle) as viewed from the ring cross section as it goes from the inner side to the outer side in the radial direction of the ring. In other words, the depth of the vent hole 62 becomes shallower from the center in the ring circumferential direction of the vent hole 62 toward both sides. The inner surface of each ventilation hole 62 is curved toward the bottom surface side of the ring portion 61 in a cross-sectional view of the ring. The other points are almost the same as in the first embodiment.

  If the vent hole 62 is configured as described above, the circulation of air inside and outside the rubber elastic body 4 through the vent hole 62 is promoted due to its structure. Therefore, the heat inside the rubber elastic body 4 can be surely released, and the durability of the vibration isolating bush 1 can be improved with certainty.

(Embodiment 4)
In the present embodiment, the vent hole 62 has a shape having a fan effect. Hereinafter, this point will be described.

  As shown in FIG. 6, each air hole 62 has a generally U shape (boomerang shape) as viewed from the bottom of the ring, which expands from the inner side in the ring radial direction toward the outer side in the ring circumferential direction. That is, each air hole 62 gradually expands from the inner side to the outer side in the ring radial direction as viewed from the bottom of the ring, and then expands rapidly. Each vent 62 has a substantially half-mountain shape (triangular shape) as viewed in the radial direction of the ring that expands toward the disc portion 60 as it goes to the other side in the ring circumferential direction, and crosses the ring that expands toward the disc portion 60 as it goes from the inside to the outside in the radial direction of the ring. It has a substantially half-mountain shape (triangular shape). That is, each ventilation hole 62 is formed by cutting off the ring portion 61 obliquely like a fan, and has a substantially triangular pyramid shape. The inner surface of each ventilation hole 62 is curved toward the bottom surface side of the ring portion 61 in the ring longitudinal sectional view and the transverse sectional view. The other points are almost the same as in the first embodiment.

  If the vent hole 62 is configured in this way, the air flow through the vent hole 62 inside and outside the rubber elastic body 4 is promoted due to its structure. Specifically, as indicated by an arrow in FIG. 6A, air is sucked from the outside to the inside through the vent hole 62. Therefore, the heat inside the rubber elastic body 4 can be surely released, and the durability of the vibration isolating bush 1 can be improved with certainty.

(Other embodiments)
In each of the above embodiments, the vent hole 62 is configured as described above. However, as long as the vent hole 62 is opened at the bottom surface and the outer peripheral surface of the ring portion 61 and the bottom surface side and the outer peripheral surface side communicate with each other, The shape is not limited to the above.

  In each of the above embodiments, four vent holes 62 are formed at equal intervals in the circumferential direction of the ring, but one, two, three, five or more may be formed. However, it is desirable to form two, three, or four vent holes 62 at equal intervals in the ring circumferential direction. By so doing, the heat inside the rubber elastic body 4 can be surely released as compared with the case where one vent hole is formed, and the durability of the vibration isolating bush 1 can be improved with certainty. Further, the structural strength of the ring portion 61 of the stopper 6 can be improved as compared with the case where a large number of vent holes are formed, and the stopper 6 can be prevented from falling off the inner cylinder 2.

  In each of the above embodiments, the air holes 62 are formed by cutting the ring portion 61. However, the air hole 62 may be formed by integrally forming the disk portion 60 and the ring portion 61 by vulcanization.

  In each of the above embodiments, the stopper 6 is externally fitted to both axial ends of the inner cylinder 2, but may be externally fitted to at least one end of the inner cylinder 2 in the axial direction.

  In each of the above embodiments, the vibration isolating bush 1 is applied to the front suspension of an automobile, but it may be applied to other parts of the vehicle.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the stopper and the vibration isolating bush according to the present invention can be applied to uses for improving the durability of the vibration isolating bush.

DESCRIPTION OF SYMBOLS 1 Anti-vibration bush 2 Inner cylinder 3 Outer cylinder 4 Rubber elastic body 40 Straight part 5 Bush main body 6 Stopper 60 Disk part 61 Ring part 62 Vent hole 62a First vent hole 62b Second vent hole 7 Front suspension link cylinder part

Claims (6)

An anti-vibration bush including a bush body having an inner cylinder, an outer cylinder provided around the inner cylinder, and a rubber elastic body provided between the two cylinders and connecting the cylinders to each other A stopper for restricting the relative movement in the axial direction of the two cylinders, which is fitted on at least one end of the inner cylinder in the axial direction,
A disk-shaped disk part that is disposed on the axial end surface of the inner cylinder and has a through-hole penetrating in the thickness direction in a portion corresponding to the hollow part of the inner cylinder;
An annular rubber ring portion provided on the outer peripheral side of the bottom surface of the disk portion and disposed around the axial end portion of the inner cylindrical body,
The ring portion is formed with a vent hole that opens at the bottom surface and the outer peripheral surface and communicates the bottom surface side and the outer peripheral surface side with each other.
The said air hole is opened in the inner peripheral surface of the said ring part, The stopper characterized by the above-mentioned. The stopper according to claim 1,
The vent hole has a substantially truncated fan shape as viewed from the bottom of the ring that expands toward both sides of the ring as it goes from the inner side to the outer side in the ring radial direction, and a cross-sectional view of the ring that expands toward the disk part as it goes from the inner side to the outer side in the radial direction of the ring A stopper characterized by a half-mountain shape. The stopper according to claim 1,
The vent has first and second vents that are substantially U-shaped when viewed from the bottom of the ring and expand from the inner side toward the outer side in the ring radial direction. The second ventilation holes are alternately arranged in the ring circumferential direction,
Each of the first and second vent holes has a substantially rectangular shape in a ring cross-sectional view. An anti-vibration bush including a bush body having an inner cylinder, an outer cylinder provided around the inner cylinder, and a rubber elastic body provided between the two cylinders and connecting the cylinders to each other A stopper for restricting the relative movement in the axial direction of the two cylinders, which is fitted on at least one end of the inner cylinder in the axial direction,
A disk-shaped disk part that is disposed on the axial end surface of the inner cylinder and has a through-hole penetrating in the thickness direction in a portion corresponding to the hollow part of the inner cylinder;
An annular rubber ring portion provided on the outer peripheral side of the bottom surface of the disk portion and disposed around the axial end portion of the inner cylindrical body,
The ring portion is formed with a vent hole that opens at the bottom surface and the outer peripheral surface and communicates the bottom surface side and the outer peripheral surface side with each other.
The vent hole is not open on the inner peripheral surface of the ring part, and has a generally U-shape in a ring bottom view that expands from the inner side to the outer side in the ring radial direction and the other side in the ring peripheral direction. The ring has a substantially half-mountain shape in the radial direction of the ring that expands toward the disk portion as it goes to the side, and has a substantially half-mountain shape in a ring cross-sectional view that expands to the disk portion side as it goes from the inside to the outside in the ring diameter direction Stopper. In the stopper as described in any one of Claims 1-4,
2. The stopper according to claim 2, wherein two, three, or four vent holes are formed at equal intervals in the circumferential direction of the ring. A bush main body having an inner cylindrical body, an outer cylindrical body provided around the inner cylindrical body, and a rubber elastic body provided between the two cylindrical bodies and connecting the two cylindrical bodies to each other; and the inner cylindrical body An anti-vibration bush provided with a stopper for restricting the relative movement in the axial direction of the two cylinders, which is externally fitted to at least one end in the axial direction,
The anti-vibration bushing, wherein the stopper is the stopper according to any one of claims 1 to 5.

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