JP2008175320A - Vibration absorbing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration absorbing device wherein two fittings having working force in the directions of separating each other can be more firmly caulked and fastened together. <P>SOLUTION: A flange portion 16A of an outer cylinder fitting 16 is held between a flange portion 66A of a stopper fitting 66 and a flange portion 14A of a holder fitting 14. The flange portion 14A has a larger diameter than the flange portion 66A. The outer end of the flange portion 66A is folded back to the upper side and the outer end of the flange portion 14A is folded back to the lower side while covering an end face 66E of the flange portion 66A, and then both of them are caulked to form a caulked portion 68. Namely, an edge 14E of the flange portion 14A is folded back to the direction of being separated from the stopper fitting 66 and an edge 66E of the flange portion 66A is folded back to the direction of being separated from the holder fitting 14, and then both of them are caulked and fastened. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration isolator that is used as an engine mount or the like in a general industrial machine or an automobile and absorbs and attenuates vibration transmitted from a vibration generating unit such as an engine to a vibration receiving unit such as a vehicle body.

  For example, an anti-vibration device as an engine mount is disposed between an engine that is a vibration generation unit of a vehicle and a vehicle body that is a vibration receiving unit, and the anti-vibration device absorbs vibration generated by the engine, Suppresses vibration transmission to the vehicle body. As such an anti-vibration device, a liquid-sealed device is known in which an elastic body and a pair of liquid chambers are provided inside the device, and the pair of liquid chambers communicate with each other through a restriction passage. According to this liquid-filled vibration isolator, when vibration is generated when the mounted engine is operated, the vibration damping function of the elastic body and the viscosity of the liquid in the orifice communicating between the pair of liquid chambers Absorbs vibration with resistance, etc., and suppresses vibration transmission to the vehicle body.

  As a conventional liquid-filled vibration isolator as described above, for example, there is one disclosed in Patent Document 1. As shown in FIG. 4, the vibration isolator 110 described in Patent Document 1 is provided with a thin cylindrical outer cylinder fitting 120, and a substantially columnar upper mounting fitting on the inner peripheral side of the outer cylinder fitting 120. 116 is provided, and rubber elastic bodies 118 are respectively vulcanized and bonded between the metal fittings 116 and 120. The outer cylinder fitting 120 is inserted into the cup-shaped holder fitting 114, and the lower end portion of the stopper fitting 112 arranged on the upper side thereof is fixed to the holder fitting 114 by caulking the upper end portion of the stopper fitting 112. Has been.

  A rubber diaphragm 122 formed in a thin film shape is disposed in the outer tube fitting 120, and a liquid chamber 124 is provided between the diaphragm 122 and the elastic body 118. The liquid chamber 124 is divided into a pressure receiving liquid chamber 124A and a sub liquid chamber 124B by a partition member 130. A groove-shaped orifice 132 is formed on the outer peripheral portion of the partition member 130, and the orifice 132 allows the pressure receiving liquid chamber 124A and the sub liquid chamber 124B to communicate with each other. Thereby, in the vibration isolator 110, when the vibration is input, the liquid in the liquid chambers 124A and 124B flows through the orifice 132, so that the vibration is absorbed by the viscous resistance of the liquid.

  Further, in the vibration isolator 110, a substantially circular opening 130A is formed in the partition member 130, and a rubber membrane 134 formed in a plate shape having a substantially constant thickness is disposed in the opening 130A. Has been. The outer periphery of the membrane 134 is bonded to the inner peripheral edge of the opening 130A over the entire periphery to close the opening 130A. As a result, in the vibration isolator 110, even when the orifice 132 is provided in response to vibration in a relatively low frequency range, for example, shake vibration, vibration in a relatively high frequency range, for example, idle vibration is input from the engine. Sometimes, the membrane 134 is elastically deformed by the vibration in the high frequency range transmitted to the liquid in the pressure receiving liquid chamber 124A, thereby suppressing the increase in the liquid pressure in the pressure receiving liquid chamber 124A. As a result, the vibration isolator 110 maintains a small dynamic spring constant even when vibrations in a relatively high frequency range are input from the engine, and can effectively absorb vibrations in the high frequency range.

In the vibration isolator having the above configuration, the stopper ring 140 abuts against the stopper fitting 112, so that the relative movement between the outer cylinder fitting 120 and the attachment fitting 116 during rebound is restricted. Therefore, at the time of rebound, a force acts between the stopper fitting and the holder fitting so as to be pulled away from each other. The stopper fitting 112 and the holder fitting 114 are fastened by being crimped, but it is also conceivable that the fastening is loosened by the action of the above force.
Japanese Patent Application No. 11-153178

  The object of the present invention has been made in consideration of the above-mentioned facts, and when two metal fittings acting in a direction away from each other are fastened by caulking, a stronger caulking fastening and An anti-vibration device that can be provided is provided.

  In order to achieve the above object, a vibration isolator according to claim 1 of the present invention includes a bracket metal fitting having a cylindrical outer cylinder portion connected to one of a vibration generating portion and a vibration receiving portion, and the bracket metal fitting. A connecting member connected to the other of the vibration generating portion and the vibration receiving portion, an elastic body arranged between the connecting member and the bracket fitting, and the bracket fitting of the connecting member And a stopper fitting that is clamped and fastened with an edge of the bracket fitting, and restricts movement of the connecting member in a direction away from the bracket fitting, One of the bracket fitting and the stopper fitting covers the other end surface of the bracket fitting and the stopper fitting, and the end of the stopper fitting is separated from the bracket fitting. Folded to, the end edge of the bracket fitting is characterized, that are folded away from the stopper fitting.

  In the vibration isolator according to the first aspect, when the connecting member moves in a direction away from the bracket metal, a force in a direction in which both of the stopper metal and the bracket metal are separated is brought into contact with the stopper metal. The stopper fitting and the bracket fitting on which such a force acts are caulked and fastened to each other. In this caulking fastening portion, one of the bracket metal fitting and the stopper metal fitting is crimped so as to cover the other end face. Further, the end edge of the stopper fitting is folded back in the direction away from the bracket fitting, and the end edge of the bracket fitting is folded back in the direction away from the stopper fitting. According to this configuration, when a force in a direction in which both of the stopper metal and the bracket metal are separated from each other acts, the force is received by the end surfaces of the stopper metal and the bracket metal. Therefore, it is possible to suppress the loosening of the caulking portion compared to a case where the caulking is simply performed in a U-shape, and to achieve strong caulking.

  In the vibration isolator according to claim 2 of the present invention, the bracket metal fitting is fixed to one of the cylindrical holder part in which the outer cylinder part is fitted on the inner peripheral side, and the vibration generating part and the vibration receiving part. It is characterized by comprising the fixed part.

  By adopting the above configuration, the bracket metal fitting has a double structure of the outer holder portion and the inner outer cylinder portion, and the configuration on the inner peripheral side of the outer cylinder portion can be manufactured separately from the holder portion.

  In the vibration isolator according to claim 3 of the present invention, the caulking fastening portion is composed of an end edge of the holder portion and an end edge of the stopper metal, and an end edge of the outer cylinder portion on the connecting member side is It is clamped between the holder part and the stopper metal fitting.

  According to the said structure, an outer cylinder part can be reliably connected with one of a vibration generation part and a vibration receiving part.

  As described above, according to the vibration isolator of the present invention, the stopper fitting and the bracket fitting can be firmly crimped and fastened.

  Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a vibration isolator 10 according to an embodiment of the present invention. The vibration isolator 10 is applied as an engine mount that supports an engine that is a vibration generating unit in an automobile to a vehicle body that is a vibration receiving unit. In addition, the code | symbol S in a figure shows the axial center of an apparatus, The following is demonstrated by making the direction along this axial center S into the axial direction of an apparatus.

  As shown in FIG. 1, the vibration isolator 10 is provided with a bracket 12 and a connecting member 20. The bracket metal fitting 12 is composed of a bottomed and substantially cylindrical holder metal fitting 14, an outer cylindrical metal fitting 16 fitted on the inner peripheral side of the holder metal fitting 14, and a fixed leg 18 fixed to the outside of the holder metal fitting 14. . Between the connecting member 20 and the outer cylinder fitting 16, a rubber elastic body 30 serving as a main vibration absorber is disposed.

  The connecting member 20 has a substantially truncated cone shape and is arranged coaxially with the outer cylinder fitting 16 so that the lower side has a small diameter. The connecting member 20 is formed with a screw hole 20A in which a female screw is formed from the center portion on the upper surface toward the lower side in the axial direction.

  The outer cylinder fitting 16 has a substantially cylindrical shape, and the upper side has a slightly smaller diameter than the lower side. The outer tube fitting 16 is formed with an annular flange portion 16A extending to the outer peripheral side at the upper end portion thereof, and a caulking portion 16B having a diameter decreasing in a taper shape downwardly at the lower end portion. . The elastic body 30 is vulcanized and bonded to the outer periphery of the connecting member 20 and is vulcanized and bonded to the vicinity of the upper end portion including the flange portion 16A of the outer cylinder fitting 16 so that the connecting member 20 and the outer cylinder fitting 16 are elastically bonded. Are connected.

  The elastic body 30 is integrally formed with a thin film-like covering portion 32 extending downward from the lower end portion thereof. The covering portion 32 is vulcanized and bonded to the inner peripheral surface of the outer cylindrical metal member 16 to cover the inner peripheral surface of the outer cylindrical metal member 16.

  An orifice forming member 40 is fitted on the inner peripheral side of the covering portion 32. The orifice forming member 40 has an annular shape, and a spiral groove is formed on the outer peripheral wall. The groove and the covering portion 32 constitute an orifice 42 as a restriction passage.

  A stepped portion 44 having a large diameter on the lower side is formed on the inner peripheral wall of the orifice forming member 40, and a membrane 46 is disposed with the outer edge pressed against the stepped portion 44. The membrane 46 has a substantially disk shape, and partitions the space formed inside the outer cylinder fitting 16 and the elastic body 30. The upper space partitioned by the membrane 46 is referred to as a main liquid chamber 52, and the lower space is referred to as a sub liquid chamber 54. The main liquid chamber 52 and the sub liquid chamber 54 communicate with each other through the orifice 42.

  The membrane 46 is attached so that the outer edge portion is pressed against the stepped portion 44 from the lower side by a pressing metal 48.

  A ring 38 is disposed below the orifice forming member 40 and on the inner peripheral side of the covering portion 32. In the outer tube fitting 16 in which the orifice forming member 40 and the ring 38 are inserted on the inner peripheral side, the caulking portion 16B is crimped on the inner peripheral side. Thereby, the orifice forming member 40 and the ring 38 are fixed in the outer cylinder fitting 16.

  The outer periphery of the rubber diaphragm 36 is vulcanized and bonded to the ring 38 over the entire circumference. The diaphragm 36 is formed in a substantially truncated cone shape that protrudes upward in a state in which no elastic deformation has occurred, and can be elastically deformed so as to change the volume in the outer cylinder fitting 16 along the axial direction. ing. The ring 38 is in pressure contact with the inner peripheral wall of the outer cylinder fitting 16 through the covering portion 32.

  The space in the outer cylinder fitting 16 and the elastic body 30 is sealed from the outside by a diaphragm 36, and the sealed space is partitioned into the main liquid chamber 52 and the sub liquid chamber 54 described above. A liquid L such as water or oil is enclosed in the sealed space.

  A flange portion 14A extending to the outer peripheral side is formed at the upper end portion of the holder metal member 14, and this flange portion 14A contacts the flange portion 16A to position the outer tube metal member 16 at a predetermined position along the axial direction. is doing.

  A fixed leg 18 is fixed to the lower side of the outer periphery of the holder metal 14 by welding or the like. The fixed leg 18 is formed in a plate shape bent into an L shape, and the two fixed legs 18 are fixed to the lower outer periphery of the holder metal member 14 so that the L shape faces each other. The lower surface of the fixed leg 18 is fixed to a vehicle body (not shown). A space is formed below the holder metal member 14, and elastic deformation of the diaphragm 36 downward is allowed.

  The vibration isolator 10 is provided with a stopper metal 66 so as to face the holder metal 14. The stopper fitting 66 is curved so as to have a substantially U-shape that opens downward, and flange portions 66A that are bent toward the outer peripheral side are formed at both ends of the stopper fitting 66, respectively. The connecting member 20 and the stopper rubber 22 are disposed inside the U-shape of the stopper fitting 66. Therefore, the stopper fitting 66 is arranged so as to cover the connecting member 20 and the holder fitting 14 opposite to the stopper rubber 2. The upper side of the stopper rubber 22 is opposed to the inner side of the U-shaped intermediate portion of the stopper fitting 66.

  The flange portion 16A of the outer tube fitting 16 is sandwiched between the flange portion 66A of the stopper fitting 66 and the flange portion 14A of the holder fitting 14. The flange portion 14A has a larger diameter than the flange portion 66A, the outer end of the flange portion 66A is folded upward, and the outer end of the flange portion 14A covers the end surface 66E of the flange portion 66A and is folded downward. The caulking portion 68 is configured by caulking. That is, the end edge 14F of the flange portion 14A is folded back in a direction away from the stopper metal fitting 66, and the end edge 66F of the flange portion 66A is fastened so as to be folded back in a direction away from the holder metal fitting 14.

  Next, the operation of the vibration isolator 10 according to the present embodiment configured as described above will be described.

  In the vibration isolator 10, when the elastic body 30, which is the main vibration absorber, is elastically deformed by vibration when vibration is input from the engine or the vehicle body side, the vibration is attenuated and absorbed by the elastic body 30.

  Further, in the vibration isolator 10, the internal volume of the main liquid chamber 52 expands and contracts due to the deformation of the elastic body 30, and the liquid L flows between the main liquid chamber 52 and the sub liquid chamber 54 as the main liquid chamber 52 expands and contracts. It flows mutually through the orifice 42. At this time, at the time of input of vibration in a relatively low frequency range, for example, shake vibration, liquid column resonance occurs in which the liquid L flows in and out between the main liquid chamber 52 and the sub liquid chamber 54 in resonance with the input vibration. . At this time, vibration energy is absorbed by the pressure change of the liquid generated in the space in the orifice 42, the viscous resistance of the liquid flow, and the like, so that the vibration isolator 10 is particularly sensitive to vibration in a relatively low frequency range such as shake vibration. The liquid can be effectively absorbed by the liquid column resonance between the main liquid chamber 52 and the sub liquid chamber 54.

  The diaphragm 36 is elastically deformed so as to bulge outward when the liquid L flows from the main liquid chamber 52 into the sub liquid chamber 54, thereby suppressing an excessive increase in the liquid pressure in the sub liquid chamber 54. This prevents the liquid L from flowing from the main liquid chamber 52 into the sub liquid chamber 54 due to the increase in the liquid pressure in the sub liquid chamber 54.

  On the other hand, when vibrations in a relatively high frequency range, such as idle vibrations, are input from the engine, the orifice 42 is clogged and cannot absorb vibrations due to liquid column resonance. At this time, the membrane 46 is elastically deformed so as to expand and contract the volume in the main liquid chamber 52 by vibration in a high frequency range transmitted to the liquid L in the main liquid chamber 52. As a result, an increase in the fluid pressure in the main fluid chamber 52 is suppressed, so that even when a relatively high frequency range vibration is input from the engine, the dynamic spring accompanying the increase in the fluid pressure of the liquid L in the main fluid chamber 52 Since the increase in the constant can be suppressed, vibrations in a high frequency range can be effectively absorbed.

  Furthermore, when a vibration with a large amplitude is input from the engine, the connecting member 20 and the outer cylinder fitting 16 are relatively moved in a direction away from each other following an operation of relatively moving in a direction toward each other. At this time, the stopper rubber 22 disposed on the upper side of the connecting member 20 abuts against the stopper fitting 66 and elastically deforms, so that the relative movement of the connecting member 20 with respect to the outer tubular fitting 16 is restricted. At this time, forces directed in directions away from each other act on each of the holder metal member 14 and the stopper metal member 66 constituting a part of the bracket metal member 12 (arrows X and Y in FIG. 1). In the present embodiment, the caulking portion 68 is folded and crimped in the direction in which the end edges 14F and 66F of the holder metal member 14 and the stopper metal member 66 are separated from each other. 66 and the end surfaces 66E and 14E of the holder fitting 14. Therefore, it is possible to suppress the loosening of the caulking portion compared to a case where the caulking is simply performed in a U-shape, and to achieve strong caulking.

In the present embodiment, the flange portion 14A of the holder metal piece 14 has a larger diameter than the flange portion 66A of the stopper metal piece 66, and is crimped so as to cover the end surface 66E of the stopper metal piece 66 with the edge of the holder metal piece 14. However, as shown in FIG. 2, the diameter of the flange portion 66A of the stopper fitting 66 is made larger than that of the flange portion 14A of the holder fitting 14, and the end surface 14E of the holder fitting 14 is covered with the edge 66F of the stopper fitting 66. You can tighten it.
In the present embodiment, the liquid seal type vibration isolator has been described. However, the present invention may be applied to a solid type vibration isolator having no liquid seal portion as shown in FIG. The vibration isolator 70 shown in FIG. 3 does not include the orifice forming member 40, the membrane 46, and the presser fitting 48, and the main liquid chamber and the sub liquid chamber are not configured. And then. A lower portion of the elastic body 30 is supported by the caulking portion 16 </ b> B of the outer cylinder fitting 16, and a concave portion 30 </ b> A is formed in the lower portion of the elastic body 30.
Also in the vibration isolator 70 having the above-described configuration, the caulking portion 68 similar to that of the vibration isolator 10 can suppress loosening of the caulking portion.

It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on embodiment of this invention. It is side surface sectional drawing which shows the structure of the modification of the vibration isolator which concerns on embodiment of this invention. It is side surface sectional drawing which shows the structure of the vibration isolator which concerns on the modification of embodiment of this invention. It is side surface sectional drawing which shows the structure of the vibration isolator of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Antivibration device 12 Bracket metal fitting 14 Holder metal fitting 14A Flange part 14E End surface 14F End edge 16 Outer cylinder metal fitting 16A Flange part 18 Fixed leg 20 Connecting member 30 Elastic body 36 Diaphragm 40 Orifice formation member 42 Orifice 44 Step part 52 Main liquid chamber 54 Sub liquid chamber 66 Stopper fitting 66A Flange 66E End face 66F End edge 70 Vibration isolator

Claims (3)

A bracket fitting having a cylindrical outer cylinder portion and connected to one of the vibration generating portion and the vibration receiving portion;
A connecting member disposed on the inner peripheral side of the bracket metal fitting and connected to the other of the vibration generating portion and the vibration receiving portion;
An elastic body disposed between the connecting member and the bracket fitting;
The connecting member is disposed so as to cover the side opposite to the bracket fitting, restricts movement of the connecting member in a direction away from the bracket fitting, and an end edge is fastened and fastened to an edge of the bracket fitting. Stopper metal fittings,
With
In the caulking and fastening portion between the bracket fitting and the stopper fitting, one of the bracket fitting and the stopper fitting covers the other end surface, and the edge of the stopper fitting is folded back away from the bracket fitting. An anti-vibration device, wherein an end edge of the metal fitting is folded back in a direction away from the stopper metal fitting.   The bracket metal fitting includes a cylindrical holder portion in which the outer cylinder portion is fitted on the inner peripheral side, and a fixing portion that is fixed to one of the vibration generating portion and the vibration receiving portion. The vibration isolator according to claim 1.   The caulking fastening portion is configured by an end edge of the holder portion and an end edge of a stopper fitting, and an end edge of the outer cylinder portion on the connecting member side is sandwiched between the holder portion and the stopper fitting. The vibration isolator according to claim 2, wherein

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