JP2007056914A - Liquid-sealed type vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extend the length of an orifice passage while solving a problem of contraction after molding in a resin partition member without enlarging a vibration control device. <P>SOLUTION: The partition member 24 for separating a main liquid chamber 20 and a sub-liquid chamber 22 is equipped with a cylindrical resin orifice forming part 34. The orifice passage 26 for communicating the main liquid chamber 20 and the sub-liquid chamber 22 is formed by fitting a gutter 38 provided in its outer circumference face 34a to an inner circumference of a second fixture 12 via a rubber layer 28. A longitudinal wall 40 is provided on an outer circumference face 34a of the orifice forming part 34, extending fully in a shaft direction, an opening part 42 to the main liquid chamber side and an opening part 44 to the sub-liquid chamber side are provided on both sides across the longitudinal wall 40 and the gutter 38 is formed as a turn of spiral gutter 38 extending in a circumference direction and inclining in the shaft direction in the outer circumference face 34a of the orifice forming part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid filled type vibration damping device mainly used for vibration-proofing a vibration generator such as an automobile engine.

  As a mount for supporting a vibration generating body such as an automobile engine so that the vibration is not transmitted to the vehicle body, a liquid filled type vibration isolator is known.

  In general, a liquid-filled vibration isolator is composed of a rubber elastic body in which a first fixture attached to a vibration generating body side such as an engine and a cylindrical second fixture attached to a support side such as a vehicle body frame are made of a rubber elastic body. A diaphragm made of a rubber film is attached to the second fixture so as to be opposed to the vibration isolating base, and an inner chamber between the vibration isolating base and the diaphragm is a liquid sealed chamber. The liquid sealing chamber is partitioned by a partition member into a main liquid chamber on the vibration isolation base side and a sub liquid chamber on the diaphragm side, and both liquid chambers are communicated with each other through an orifice channel. In order to form the orifice channel, a structure is known in which a groove is provided on the outer peripheral surface of the partition member, and the outer peripheral surface of the partition member is fitted to the inner periphery of the second fixture via a rubber layer. It has been.

  Such a liquid-filled vibration isolator is configured to perform a vibration damping function and a vibration insulation function by virtue of the liquid flow effect between the two liquid chambers by the orifice channel and the vibration damping effect of the vibration isolating substrate. In order to improve this, it may be required to lengthen the orifice flow path. As a measure for responding to such a requirement without increasing the size of the vibration isolator, the following Patent Document 1 proposes forming an orifice channel spirally on the outer peripheral surface of the partition member. .

In addition, Patent Document 2 below also discloses that the orifice flow path provided on the outer peripheral surface of the partition member is spiral, but the partition member disclosed in this document is the axial direction in the second fixture. Therefore, it is not assembled to the inner peripheral surface of the second fixture with a high sealing performance through a rubber layer as in the present invention.
JP-A-4-362332 U.S. Pat. No. 4,836,512

  As disclosed in Patent Document 1 above, this type of partition member may be molded of resin for weight reduction or the like, but in that case, the second fixture is contracted by contraction of the resin after molding. The sealing performance between the inner peripheral surface and the inner peripheral surface may be impaired, and there is a problem that a desired orifice length cannot be ensured even though the bent orifice flow path is formed in a spiral shape.

  The present invention has been made in view of the above points, and it is possible to reliably lengthen the orifice flow path without increasing the size of the vibration isolator and solving the problem of shrinkage after molding in the resin partition member. An object of the present invention is to provide a liquid-filled vibration isolator that can be used.

  A liquid-filled vibration isolator according to the present invention includes a first fixture, a cylindrical second fixture, and a vibration-proof base made of a rubber elastic body that connects the first fixture and the second fixture, A diaphragm that is arranged to face the vibration isolating base and forms a liquid sealing chamber with the vibration isolating base inside the second fixture, and the liquid sealing chamber is a main liquid chamber on the vibration isolating base side. A partition member for partitioning into the sub-liquid chamber on the diaphragm side, and the partition member includes a cylindrical resin-made orifice forming portion on an outer peripheral portion, and a groove is provided on the outer peripheral surface of the orifice forming portion. Then, the orifice forming portion is fitted to the inner periphery of the second fixture via a rubber layer provided on the inner peripheral surface of the second fixture, so that the gap is formed between the rubber layer by the groove. In a liquid-filled type vibration damping device in which an orifice channel for communicating the main liquid chamber and the sub liquid chamber is formed A vertical wall extending in the axial direction on the outer peripheral surface of the orifice forming portion to partition the outer peripheral surface in the circumferential direction, and the main liquid of the orifice channel is disposed on one side in the circumferential direction across the vertical wall. An opening to the chamber side, and an opening to the sub liquid chamber side of the orifice channel on the other side, an opening to the main liquid chamber side and an opening to the sub liquid chamber side The groove connecting the portion is formed as a spiral groove of one circumference extending in the circumferential direction while being inclined in the axial direction on the outer peripheral surface of the orifice forming portion.

  In this way, the orifice channel is formed by one round spiral groove extending in the circumferential direction so as to connect the openings on both sides of the vertical wall, thereby making the orifice channel longer without increasing the size of the vibration isolator. In addition, a smooth liquid flow between the main liquid chamber and the sub liquid chamber can be realized, and loss can be reduced. Furthermore, the problem of shrinkage after molding of the resin-made orifice forming portion is provided with a vertical wall extending over the entire axial direction of the orifice forming portion, and this serves as a reinforcement to suppress shrinkage after molding. In particular, although the vicinity of the opening to the main liquid chamber and the sub liquid chamber is easily deformed, since such openings are provided on both sides of the vertical wall, this deformation can be effectively suppressed.

  In the liquid filled type vibration damping device of the present invention, a pair of circumferential walls that are spaced apart in the axial direction and extend in the circumferential direction are provided on the outer circumferential surface of the orifice forming portion, and the pair of circumferential walls The spiral groove is formed between the circumferential walls, and a meat stealing groove extending in the circumferential direction is provided in the circumferential wall, whereby the circumferential wall is at least one in the circumferential direction of the side surface of the spiral groove. It is preferable to be configured to include a spiral ridge constituting the portion and an annular ridge extending in the circumferential direction on the axially outer side.

  By providing meat stealing in this way, shrinkage after molding of the orifice forming portion can be suppressed, and the amount of resin used can be reduced. Moreover, it is not a mere stealing but is provided as a meat stealing groove extending in the circumferential direction so that the circumferential wall includes a spiral ridge along the orifice channel and an annular ridge on the outer side thereof. Therefore, when the orifice forming portion is fitted to the inner peripheral surface of the second fixture, the circumferential walls on both sides forming the spiral groove can be pressed against the rubber layer in a form as close as possible to the line contact, Therefore, the surface pressure with respect to the rubber layer is increased and the sealing performance can be improved.

  In the liquid-filled vibration isolator of the present invention, a reinforcing ridge extending in the axial direction for connecting the spiral ridge and the annular ridge is provided at at least one place in the circumferential direction of the meat stealing groove. It is preferable. Thereby, the said circumferential direction wall provided with a helical protrusion and a cyclic | annular protrusion can be reinforced effectively.

  As described above, according to the present invention, the orifice flow path can be lengthened without increasing the size of the vibration isolator, and the smooth liquid flow between the main liquid chamber and the sub liquid chamber can be achieved. Realize and reduce loss. And the shrinkage | contraction after shaping | molding of the resin-made orifice formation part is suppressed, the sealing performance between the inner peripheral surfaces of a 2nd fixture can be improved, and a desired orifice length can be obtained reliably. .

  Hereinafter, a liquid filled type vibration isolator according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a liquid-filled vibration isolator according to an embodiment of the present invention.

  This liquid-filled vibration isolator is an engine mount for supporting an automobile engine and preventing the engine vibration from being transmitted to a vehicle body frame. As shown in FIG. 1, the vibration isolator includes an upper first fixture 10 that is attached to an engine-side member 1 and a cylindrical lower second fixture that is attached to a body frame-side member 2. 12, a vibration isolating base 14 made of a rubber elastic body for connecting them, and a liquid sealing chamber 16 disposed between the anti-vibration base 14 and the anti-vibration base 14 inside the second fixture 12. A diaphragm 18 made of a flexible rubber film to be formed, a partition member 24 that partitions the liquid sealing chamber 16 into a main liquid chamber 20 on the vibration isolating base 14 side and a sub liquid chamber 22 on the diaphragm 18 side, and the main liquid chamber 20 And an orifice channel 26 for communicating the auxiliary liquid chamber 22 with each other.

  The first fixture 10 has a substantially cylindrical shape and is disposed above the axial center of the second fixture 12. The second fixture 12 has a stepped cylindrical shape, and a vibration-proof base 14 is vulcanized and bonded to the upper inner peripheral surface on the large diameter side. A rubber layer 28 extending integrally from the vibration isolating base 14 is provided on the lower inner peripheral surface on the small diameter side over the entire axial direction and circumferential direction. The anti-vibration base body 14 has a substantially truncated cone shape, the first fixture 10 is embedded in the upper portion thereof, and the second fixture 12 is vulcanized and bonded to the lower end portion thereof. The diaphragm 18 is provided with an annular reinforcing metal fitting 30 on the outer peripheral portion, and is fitted by fitting the reinforcing metal fitting 30 to the inner peripheral surface of the lower end of the second fixture 12 and bending the lower end inward. Yes.

  The partition member 24 is fitted to the inner peripheral surface of the second fixture 12 via a rubber layer 28, and an orifice channel 26 is formed between the outer periphery of the partition member 24 and the rubber layer 28. ing. The partition member 24 is positioned in the axial direction between the upper surface of the reinforcing metal fitting 30 of the diaphragm 18 and the protrusions 32 provided at a plurality of locations in the circumferential direction on the peripheral surface of the lower surface of the vibration isolation base 14.

  In this embodiment, the partition member 24 is formed by a resin-made orifice forming portion 34 provided on the outer peripheral portion, and vulcanized and bonded so as to close the central opening thereof, so that the main liquid chamber 20 and the sub liquid chamber are provided. And an elastic partition film 36 made of a rubber film for partitioning 22. A groove 38 is provided on the outer peripheral surface 34 a of the orifice forming portion 34, and the orifice flow path 26 is formed between the groove 38 and the rubber layer 28 by the fitting to the second fixture 12. .

  The orifice forming part 34 is an injection-molded body of synthetic resin, and is configured as shown in FIGS.

  That is, as shown in FIGS. 3 to 7, the outer peripheral surface 34 a of the orifice forming portion 34 is provided with a vertical wall 40 extending over the entire axial direction at one place in the circumferential direction. It is partitioned in the circumferential direction by the vertical wall 40. The vertical wall 40 is a ridge that protrudes outward from the outer peripheral surface 34a and extends linearly in the axial direction.

  Openings 42 and 44 of the orifice channel 26 are provided on both sides of the vertical wall 40. Specifically, an opening 42 to the main liquid chamber 20 side is provided on one side (left side in FIG. 4) in the circumferential direction with respect to the vertical wall 40, and a sub liquid chamber is provided on the other side (right side in FIG. 4). An opening 44 to the 22 side is provided. The opening 42 to the main liquid chamber side is arranged close to the upper side (main liquid chamber 20 side) in the axial direction, and penetrates the outer peripheral surface 34a of the orifice forming portion 34 in the radial direction, as shown in FIGS. Is provided. In this embodiment, the opening 42 is formed in a cutout shape opened upward. The opening 44 to the sub liquid chamber side is arranged close to the lower side (sub liquid chamber 22 side) in the axial direction, and penetrates the outer peripheral surface 34a of the orifice forming section 34 in the radial direction, as shown in FIGS. It is provided in the shape of a rectangular hole.

  As shown in FIGS. 4 to 6, the groove 38 that forms the orifice channel 26 extends downward (on the auxiliary liquid chamber 22 side) from the opening 42 to the main liquid chamber side on the outer peripheral surface 34 a of the orifice forming portion. While being inclined in the axial direction, it is formed as one spiral groove extending in the circumferential direction and reaching the opening 44 toward the auxiliary liquid chamber. Thereby, the orifice channel 26 is also formed in a spiral shape for one round extending along the outer circumferential surface 34 a of the orifice forming portion 34. The spiral groove 38 is divided in the circumferential direction by the vertical wall 40 to prevent a short circuit between the openings 42 and 44. Further, as shown in FIG. 7, the side surface 38a of the bellows-like groove 38 is formed so as to be inclined outwardly from the vertical surface with respect to the outer peripheral surface 34a in order to improve the demolding property at the time of molding.

  The outer peripheral surface 34a of the orifice forming portion 34 is provided with a pair of upper and lower circumferential walls 46, 48 that are spaced apart from each other in the axial direction and extend in the circumferential direction. The above-mentioned spiral groove 38 is formed. Therefore, the pair of circumferential walls 46 and 48 are formed so that the width (axial dimension) varies in the circumferential direction. That is, as shown in FIGS. 4 to 6, the upper circumferential wall 46 has the narrowest width at the opening 42 to the main liquid chamber side, and gradually increases in width along the circumferential direction. It is connected to the vertical wall 40 and has the maximum width at this connecting portion. In this embodiment, the upper circumferential wall 46 is interrupted at the opening 42. Further, the lower circumferential wall 48 has the narrowest width at the opening 44 to the sub liquid chamber side, and from there, the width gradually increases in the circumferential direction toward the opposite direction to the circumferential wall 46. , It goes around and is connected to the vertical wall 40 and has the maximum width at this connecting part. Both circumferential walls 46 and 48 are set so that the width of the spiral groove 38 is constant in the circumferential direction.

  The circumferential walls 46 and 48 are respectively provided with meat stealing grooves 50 extending in the circumferential direction. The meat stealing groove 50 has a maximum width at the connection portion between the circumferential walls 46 and 48 and the vertical wall 40, and is formed so that the width gradually becomes narrower along the circumferential direction. As shown in FIG. 3, the terminal 50a is terminated in about half a circle. As a result, the circumferential walls 46 and 48 are spiral ridges 46a and 48a constituting a part of the side surface 38a of the spiral groove 38, and annular ridges 46b and 48b extending in the circumferential direction on the outer side in the axial direction. And is configured.

  The annular ridges 46b and 48b are respectively provided at the peripheral edge portions at both ends in the axial direction of the orifice forming portion 34, and project outward in the radial direction over the entire circumference of the outer peripheral surface 34a. The upper annular protrusion 46b is partially cut away because of the opening 42. The spiral ridges 46 a and 48 a are connected to the vertical wall 40, extend in the circumferential direction while being inclined in the axial direction, and are connected to the annular ridges 46 b and 48 b at the end portion 50 a of the meat stealing groove 50. ing. The spiral ridges 46a and 48a and the annular ridges 46b and 48b are set to have substantially the same width.

  As shown in FIGS. 5 and 6, the meat stealing groove 50 is provided with reinforcing protrusions 52 extending in the axial direction for connecting the spiral protrusions 46a and 48a and the annular protrusions 46b and 48b. In the example, one reinforcing protrusion 52 is provided at an intermediate position in the circumferential direction of each meat theft groove 50, 50.

  The orifice forming portion 34 constructed as described above can be obtained by partitioning the elastic partition film 36 integrally after injection molding. Next, in the liquid tank, as shown in FIG. 2, the partition member 24 is mounted together with the diaphragm 18 inside the second fixture 12 in which the vibration-proof base 14 is vulcanized, and the second fixture 12 is squeezed and contracted. The partition member 24 and the diaphragm 18 are fitted and fixed to the inner periphery of the second fixture 12 by bending the lower end and inwardly bending. Thereby, the liquid-filled vibration isolator is obtained.

  In the liquid-filled vibration isolator of the present embodiment thus obtained, the orifice channel 26 is formed by the spiral groove 38 as described above, so that the orifice channel 26 can be formed without increasing the size. Can be long. In addition, with the spiral groove 38, a smooth liquid flow between the main liquid chamber 20 and the sub liquid chamber 22 can be realized, and loss can be reduced. Further, since the vertical wall 40 is provided in the orifice forming portion 34, the vertical wall 40 is reinforced to suppress the shrinkage of the resin after molding, and particularly the openings 42 and 44 to the main liquid chamber and the sub liquid chamber. Deformation in the vicinity can be effectively suppressed.

  In the present embodiment, since the meat stealing groove 50 is provided in the circumferential walls 46 and 48 forming the spiral groove 38, sink marks after molding in this portion can be suppressed. In addition, since the circumferential walls 46 and 48 are constituted by the spiral ridges 46a and 48a and the annular ridges 46b and 48b as the meat stealing grooves 50 extending in the circumferential direction, rather than the mere meat theft, the orifice forming portion When 34 is fitted to the inner peripheral surface of the second fixture 12, the two relatively narrow protrusions 46a, 46b; 48a, 48b are pressed against the rubber layer 28 (see FIG. 1). Therefore, since the circumferential walls 46 and 48 can be pressed against the rubber layer 28 in a state as close as possible to the line contact, the surface pressure on the rubber layer 28 is remarkably increased as compared with the case where such a meat stealing groove is not provided. It is possible to improve the sealing performance.

  Furthermore, since the reinforcing protrusion 52 for connecting the helical protrusions 46a, 48a and the annular protrusions 46b, 48b is provided in the meat stealing groove 50, the circumferential walls 46, 48 are effectively reinforced. Can do.

  In the above embodiment, the partition member 24 is configured by providing the elastic partition film 36 on the inner peripheral edge of the orifice forming portion 34. However, the present invention is not limited to this, and for example, from the orifice forming portion instead of the elastic partition film. It is also possible to extend the resin partition plate as it is, and to form the partition member with an integral resin molding.

It is a longitudinal cross-sectional view of the liquid filled type vibration isolator which concerns on one Embodiment of this invention. It is an exploded sectional view of the vibration isolator. It is a top view of the orifice formation part of the vibration isolator. FIG. 4 is a side view in the IV direction of FIG. 3. FIG. 4 is a side view in the V direction of FIG. 3. FIG. 4 is a side view in the VI direction of FIG. 3. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st fixture, 12 ... 2nd fixture, 14 ... Anti-vibration base | substrate, 16 ... Liquid enclosure,
18 ... Diaphragm, 20 ... Main liquid chamber, 22 ... Sub liquid chamber, 24 ... Partition member,
26 ... Orifice channel, 28 ... Rubber layer, 34 ... Orifice formation part, 34a ... Outer peripheral surface,
38 ... groove (spiral groove), 38a ... side face, 40 ... vertical wall, 42 ... opening to the main liquid chamber side,
44 ... opening to the auxiliary liquid chamber side, 46, 48 ... circumferential wall, 46a, 48a ... spiral ridge,
46b, 48b ... annular ridge, 50 ... meat stealing groove, 52 ... reinforcing ridge

Claims (3)

A first fixture (10), a cylindrical second fixture (12), an anti-vibration base (14) made of a rubber elastic body connecting the first fixture and the second fixture, and the anti-vibration A diaphragm (18) disposed opposite to the base and forming a liquid sealing chamber (16) between the second fixture and the anti-vibration base; and the liquid sealing chamber on the main side of the anti-vibration base A partition member (24) for partitioning the liquid chamber (20) and the sub-liquid chamber (22) on the diaphragm side;
The partition member includes a cylindrical orifice forming portion (34) made of a resin in the outer peripheral portion, and a groove (38) is provided on the outer peripheral surface (34a) of the orifice forming portion. The main liquid chamber is placed between the rubber layer and the rubber layer by the groove by being fitted to the inner circumference of the second fixture via a rubber layer (28) provided on the inner peripheral surface of the second fixture. In the liquid-filled vibration isolator in which the orifice channel (26) for communicating the sub liquid chamber is formed,
A vertical wall (40) is provided on the outer peripheral surface of the orifice forming portion so as to extend over the entire axial direction and partition the outer peripheral surface in the circumferential direction. An opening (42) to the main liquid chamber side is provided, and an opening (44) to the sub liquid chamber side of the orifice channel is provided on the other side, and the opening to the main liquid chamber side The groove connecting the opening to the sub liquid chamber side is formed as a spiral groove (38) extending in the circumferential direction while inclining in the axial direction on the outer peripheral surface of the orifice forming portion. Liquid-filled vibration isolator. A pair of circumferential walls (46, 48) that are spaced apart in the axial direction and extend in the circumferential direction are provided on the outer peripheral surface of the orifice forming portion, and the spiral groove is formed between the pair of circumferential walls. Is formed,
The circumferential wall is provided with a meat stealing groove (50) extending in the circumferential direction, whereby the circumferential wall constitutes at least a part of the side surface (38a) of the helical groove in the circumferential direction. The liquid-filled vibration isolator according to claim 1, characterized by comprising a strip (46a, 48a) and an annular ridge (46b, 48b) extending in the circumferential direction on the axially outer side thereof. .   The reinforcing protrusion (52) extending in the axial direction for connecting the spiral protrusion and the annular protrusion is provided in at least one place in the circumferential direction of the meat stealing groove. Liquid-filled vibration isolator.

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