JP2009299775A - Liquid-sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid-sealed vibration control device capable of reducing shock of cavitation without causing cost increase and instability in vibration control characteristic. <P>SOLUTION: A partition member 4 for partitioning a main liquid chamber 6 and a sub-liquid chamber 7, is composed of a high elastic resin or high elastic thermoplastic elastomer. An orifice 8 is composed of a groove 19 opening on the main liquid chamber side formed in the partition member 4 and a blocking-up member 13 for blocking up the groove 19. This blocking-up member 13 is composed of the high elastic resin or resin lower in elasticity than the high elastic thermoplastic elastomer or thermoplastic elastomer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention comprises a central member, a cylindrical member disposed on the outer side in the radial direction of the central member, and a rubber member that is disposed between these members and connects these members to each other. A partition member that is liquid-tightly attached to the cylindrical member is disposed on one side in the axial direction, a main liquid chamber is formed between the partition member and the rubber member, and the partition of the main liquid chamber A liquid formed by providing a membrane member on the opposite side of the member, forming a secondary liquid chamber between the membrane member and the partition member, and communicating these liquid chambers through an orifice formed in the partition member. The present invention relates to a sealed vibration isolator, and particularly to a device capable of suppressing abnormal noise and abnormal vibration associated with a cavitation phenomenon in liquid.

  A central member, a cylindrical member disposed radially outside of the central member, and a rubber member that connects these members over the entire circumference between the members; A partition member that is liquid-tightly attached to the cylindrical member is disposed on one side in the axial direction, a main liquid chamber is formed between the partition member and the rubber member, and the partition of the main liquid chamber A liquid-sealed type in which a membrane member is provided on the opposite side across the member, a secondary liquid chamber is formed between the partition member and the membrane member, and these liquid chambers communicate with each other through an orifice formed in the partition member An anti-vibration device has been known in the past, and this device provides a desired anti-vibration performance due to the resonance effect of the fluid passing through the orifice, and the vibration when the central member and the cylindrical member are relatively displaced in the axial direction. Configured to grant, for example, It used to reduce the vibrations transmitted to the vehicle body side of the engine from the support and the engine.

  In such a liquid-filled vibration isolator, it has been known that abnormal noise or abnormal vibration occurs when a large vibration is suddenly input. Problems have become apparent with the reduction in the size and weight of the engine mount and the improvement in the quietness of the power unit including the engine. This is because when a large vibration is input, bubbles are generated in the vicinity of the partition member around the orifice entrance in the main liquid chamber, and the energy generated when the generated bubbles disappear becomes water hammer pressure and the surroundings It has been found that this is a so-called cavitation phenomenon in which abnormal noise or abnormal vibration is generated by vibrating a wall.

As a liquid-filled vibration isolator capable of effectively suppressing such a cavitation phenomenon, a partition member located in the vicinity of generating a lot of bubbles is divided into a partition metal fitting and a covering rubber vulcanized and bonded to this surface. There has been proposed a configuration in which the water hammer pressure is attenuated and relaxed by the covering rubber (see, for example, Patent Document 1).
JP 2004-204964 A

  However, in the conventional technology described above, first, since rubber is bonded to the partition metal by vulcanization, the adhesive application process and the vulcanization process are unavoidable and costly. For this purpose, it is necessary to make the partition metal thin in order to reduce the cost. In this case, in addition to lowering the rigidity as the partition member, the orifice itself, which plays a dominant role in the vibration isolation characteristics, is coated rubber. Therefore, there is a problem that the vibration-proof characteristic becomes unstable.

  The present invention has been made in view of such problems, and is a liquid that can suppress the generation of abnormal noise and abnormal vibration caused by the cavitation phenomenon without incurring high costs and instability of vibration isolation characteristics. An object of the present invention is to provide an enclosed vibration isolator.

<1> comprises a central member, a cylindrical member disposed on the radially outer side of the central member, and a rubber member that is disposed between these members and connects these members, A partition member that is liquid-tightly attached to the cylindrical member is disposed on one side in the axial direction, a main liquid chamber is formed between the partition member and the rubber member, and the partition of the main liquid chamber A liquid formed by providing a membrane member on the opposite side of the member, forming a secondary liquid chamber between the membrane member and the partition member, and communicating these liquid chambers through an orifice formed in the partition member. In the enclosed vibration isolator,
The partition member is made of a highly elastic resin or a highly elastic thermoplastic elastomer, and the orifice is made up of a groove formed in the partition member that opens to the main liquid chamber side and a closing member that closes the groove. This is a body-enclosed vibration damping device in which the closing member is made of a resin or thermoplastic elastomer having a lower elasticity than the high-elasticity resin or high-elasticity thermoplastic elastomer.

  <2> is a membrane according to <1>, wherein a membrane configured to selectively vibrate with respect to an input of a predetermined frequency or more to form a flow path around the partition member on the side facing the main liquid chamber. A membrane storage chamber is provided, and an opening communicating with the secondary liquid chamber is provided on the bottom surface of the membrane storage chamber, and the membrane storage chamber is also closed by the closing member. This is a liquid-filled vibration isolator having an opening that allows the chamber to communicate with the membrane housing chamber.

  <3> is the method according to <1> or <2>, wherein a hole is formed in the closing member, and a protrusion engaged with the hole is provided in the partition member, and a tip of the protrusion engaged with the hole is provided. The liquid-sealed vibration isolator is formed by fixing the closing member to the partition member by melting and crimping with ultrasonic waves or heat.

  <4> is a liquid-filled vibration isolator in which the closing member is fixed to the partition member by ultrasonic welding or heat welding in <1> or <2>.

  <5> is a liquid-filled vibration damping device according to <4>, wherein the base polymer is PP (polypropylene), PPB (polyferrinin sulfide), or PA (polyamide).

  <6> is any one of <1> to <5>, wherein the opening from the main body to the orifice formed in the partition member is connected to the opening of the partition member integrally with the partition member main body. A liquid-filled vibration isolator configured to expand and contract a part of the flow path of the orifice by elastically deforming the valve body by a pressure difference between the main liquid chamber and the orifice. is there.

  According to <1>, the partition member is made of a highly elastic resin or a highly elastic thermoplastic elastomer, the orifice is opened to the main liquid chamber side formed in the partition member, and the groove is closed. Since the closing member is made of a resin or thermoplastic elastomer having a lower elasticity than the high-elasticity resin or high-elasticity thermoplastic elastomer, the closure member is mainly used in the vicinity of the orifice where many bubbles are generated by cavitation. The water hammer pressure can be effectively attenuated and reduced by the low-elasticity blocking member in contact with the liquid chamber, and this can be manufactured at low cost.

  According to <2>, a membrane that houses a membrane configured to selectively vibrate with respect to an input of a predetermined frequency or more to form a flow path around the partition member on the side facing the main liquid chamber. The storage chamber is disposed, and an opening communicating with the secondary liquid chamber is provided on the bottom surface of the membrane storage chamber, and the membrane storage chamber is also closed by the closing member. The main liquid chamber and the membrane are connected to the closing member. Since the opening for communicating with the storage chamber is provided, it is possible to effectively suppress abnormal noise generated when the membrane vibrates in the storage chamber of the membrane and hits the surroundings.

  <3> According to <3>, a hole is formed in the closing member, a protrusion engaged with the hole is provided in the partition member, and a tip of the protrusion engaged with the hole is melted by ultrasonic waves or heat. Since the closing member is fixed to the partition member by crimping, the deformation of the orifice related to the joining can be suppressed to a very small level.

  According to <4>, since the blocking member is fixed to the partition member by ultrasonic welding or thermal welding, the adhesion between them can be made extremely strong.

  According to <5>, since the base polymer is PP (polypropylene), PPB (polyferrinin sulfide) or PA (polyamide), the partition member can be made inexpensive and the moldability is good. Therefore, the yield can be improved.

  According to <6>, a valve body protruding from the partition member main body into the opening is provided in the opening of the partition member that communicates from the main liquid chamber to the orifice formed in the partition member. Since it is elastically deformed due to the pressure difference between the main liquid chamber and the orifice and a part of the flow path of the orifice is expanded and contracted, when the main liquid chamber suddenly rises in pressure, the valve body is elastically deformed and the orifice Since the flow path is narrowed, the change in the liquid volume in the main liquid chamber can be suppressed, and the decrease in the liquid pressure (negative pressure) in the main liquid chamber during rebound, which causes cavitation, can be suppressed. Since it is configured integrally with the partition member main body, it is possible to prevent the generation of abnormal noise in comparison with the point of cost and the case where it is configured of metal.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the liquid-filled vibration isolator of this embodiment in a cross section passing through its central axis. The liquid-filled vibration isolator 10 includes a central member 1 positioned at the center, and a central member 1. A cylindrical member 2 arranged on the outer side in the radial direction and a rubber member 3 for connecting the members 1 and 2 between the members 1 and 2 are provided. A partition member 4 attached in a liquid-tight manner to the shaped member 2 is disposed, a main liquid chamber 6 is formed between the partition member 4 and the rubber member 3, and the partition member 4 of the main liquid chamber 6 is sandwiched A membrane member 5 is provided on the opposite side, a secondary liquid chamber 7 is formed between the membrane member 5 and the partition member 4, and these liquid chambers 6, 7 communicate with each other through an orifice 8 formed in the partition member 4. Configured so that the center member 1 and the cylindrical member 2 have an orifice relative to the axial relative displacement. 8 can obtain a desired vibration damping capability by the resonance action of the liquid passing through the.

  FIG. 2 is a cross-sectional view showing the partition member 4, and FIG. 3 is a plan view thereof. As a feature of the present invention, the partition member 4 is made of a highly elastic resin or a highly elastic thermoplastic elastomer. In addition, the orifice 8 includes a groove 19 formed in the partition member 4 that opens to the main liquid chamber side, and a closing member 13 that closes the groove 19, and the closing member 13 is formed of the highly elastic resin. Alternatively, it is composed of a resin or thermoplastic elastomer having a lower elasticity than the high-elasticity thermoplastic elastomer, and this structure eliminates bubbles that frequently occur in the vicinity of the orifice 8 of the main liquid chamber 6 due to cavitation. The water hammer pressure can be effectively attenuated and mitigated by a low-elasticity closing member, and this can be manufactured at low cost.

  Furthermore, since the orifice 8 is formed as a groove of the partition member 4 having high rigidity, the deformation of the shape can be suppressed, and the effect of stabilizing the vibration isolation characteristic can be brought about. In FIG. 3, reference numeral 18 denotes an opening that leads from the main liquid chamber 6 to the orifice 8.

  In the liquid-filled vibration isolator 10 as described above, when the vibration input exceeds a predetermined frequency, the orifice 8 passes through the response delay due to the viscosity of the liquid, and the main liquid chamber 6 and the sub liquid chamber 7 Since the liquid cannot be moved between the two, the liquid can be moved even in response to vibration input in the high frequency region. It is preferable to form a membrane housing chamber 9 having an opening 12 that allows fluid communication, and to accommodate the membrane 11 therein. Further, the membrane housing chamber 9 is closed with a closing member 13 in a state in which the membrane 11 is accommodated. In addition, it is preferable to form an opening 14 in the closing member 13 that allows liquid communication between the main liquid chamber 6 and the membrane storage chamber 9.

  The membrane 11 arranged in this way is made of, for example, a plate-like rubber material, vibrates with respect to a high frequency input of a predetermined frequency or more, and between the membrane 11 and the bottom surface of the membrane housing chamber 9 or between the membranes. 11 and the closing member 13, a gap that is not formed in a state where it does not vibrate is formed. Thus, from the opening 14 of the closing member 13, the outer peripheral surface of the membrane 11 and the inner peripheral surface of the membrane housing chamber 9 are formed. A flow path is formed through the gap 15 between the main liquid chamber 6 and the sub liquid chamber 7 through the gap 15 between the main liquid chamber 6 and the sub liquid chamber 7. As a result, good vibration isolation characteristics can be obtained even in the high frequency region.

  Here, the closure member 13 is fixed to the partition member 4 by forming the projections 23 integrally at the plurality of locations on the surface of the partition member 4 that receives the closure member 13 with the same material as the skeleton portion 21. It is preferable to form a through hole 25 through which the protrusion 23 is passed through 13, insert the protrusion 23 into the through hole 25, and then fix the tip 24 of the protrusion 23 by melting and crimping with ultrasonic waves or heat, The blocking member 13 can be attached to the partition member 4 simply and without deforming the partition member 4.

  Further, as another method for fixing the closing member 13 to the partition member 4, the base polymer of the resin constituting the partition member 4 and the closing member 13 is the same (or may be different). It is also preferable to carry out by ultrasonic welding or heat welding. In this case, PP (polypropylene), PPB (polyferrinin sulfide) or PA (polyamide) is preferably used as the base polymer.

  FIG. 4 is a plan view of a partition member shown as a modification of the embodiment corresponding to FIG. 3 of the embodiment, and FIG. 5 is a plan view and a cross-sectional view showing the vicinity of the opening in a normal state. FIG. 6 is a plan view and a cross-sectional view showing the vicinity of the opening in a state where the pressure of the main liquid chamber is increased, and the partition member 4A is provided in the opening 18A of the partition member 4A that communicates from the main liquid chamber 6 to the orifice 8. The valve body 16 protruding from the partition member 4A is formed integrally with the partition member 4A. Normally, the liquid passes through an opening other than the valve body 16 and the liquid enters and exits, but the orifice 8 When the pressure in the main liquid chamber 6 suddenly increases as compared with the inside, the valve body 16 is elastically deformed by the differential pressure, and the valve body 16 is centered in the width direction of the flow path of the orifice 8 as shown in FIG. By closing the part and narrowing the channel. Thus, it is possible to suppress the change in the amount of liquid in the main liquid chamber, thereby contributing to the reduction in the liquid pressure (negative pressure) in the main liquid chamber during rebound, which causes cavitation. .

  In the figure, reference numeral 17 denotes an opening that leads from the orifice 8 to the secondary liquid chamber 7.

  The liquid filled type vibration damping device according to the present invention can be used as an engine mount or body mount of an automobile.

It is sectional drawing which shows the liquid enclosure type vibration isolator of embodiment which concerns on this invention. It is sectional drawing which shows a partition member. It is a top view which shows a partition member. It is a top view which shows the partition member of the liquid enclosure type vibration isolator of the modification of embodiment which concerns on this invention. It is the top view and sectional drawing which show the opening part vicinity of the partition member of the modification of embodiment in a normal state. It is the top view and sectional drawing which show the opening part vicinity of the partition member of the modification of embodiment in the state in which the pressure of the main liquid chamber increased.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center member 2 Cylindrical member 3 Rubber member 4, 4A Partition member 5 Membrane member 6 Main liquid chamber 7 Sub liquid chamber 8 Orifice 9 Membrane storage chamber 10 Liquid enclosure type vibration isolator 11 Membrane 12 Opening formed in the membrane storage chamber Part 13 Closing member 14 Opening part formed in the closing member 15 Clearance between the outer peripheral surface of the membrane and the inner peripheral surface of the membrane accommodating chamber 16 Valve element 17 Opening part 18, 18A Opening part 19 Groove 23 Projection of partition member 24 Tip of protrusion 25 Through-hole of blocking member

Claims (6)

A central member, a cylindrical member disposed on the radially outer side of the central member, and a rubber member disposed between the members and connecting the members to each other on one side in the axial direction of the rubber member A partition member attached in a liquid-tight manner to the tubular member, a main liquid chamber is formed between the partition member and the rubber member, and the main liquid chamber is opposite to the partition member A liquid-filled type vibration damping device in which a membrane member is provided on the side, a secondary liquid chamber is formed between the membrane member and the partition member, and these liquid chambers communicate with each other through an orifice formed in the partition member In
The partition member is made of a highly elastic resin or a highly elastic thermoplastic thermoplastic elastomer, and the orifice is formed by a groove formed in the partition member on the main liquid chamber side and a closing member that closes the groove. A body-enclosed vibration isolator comprising the blocking member made of a resin or thermoplastic elastomer having a lower elasticity than the high-elastic resin or high-elastic thermoplastic elastomer.   On the side of the partition member facing the main liquid chamber, there is disposed a membrane storage chamber for storing a membrane configured to selectively vibrate with respect to an input of a predetermined frequency or more to form a flow path around it. An opening communicating with the secondary liquid chamber is provided on the bottom surface of the membrane housing chamber, and the membrane housing chamber is also closed by the closing member, and the opening that allows the main liquid chamber and the membrane housing chamber to communicate with the closing member. The liquid-filled vibration damping device according to claim 1, further comprising a portion.   A hole is formed in the closing member, and a protrusion engaged with the hole is provided in the partition member, and a tip of the protrusion engaged with the hole is melted by ultrasonic waves or heat and caulked. The liquid-filled vibration isolator according to claim 1 or 2, wherein a closing member is fixed to the partition member.   The liquid-filled vibration isolator according to claim 1 or 2, wherein the closing member is fixed to the partition member by ultrasonic welding or heat welding.   The liquid-filled vibration isolator according to claim 4, wherein the base polymer is PP (polypropylene), PPB (polyferrinin sulfide), or PA (polyamide).   A valve body is provided at the opening of the partition member that communicates with the orifice formed in the partition member from the main liquid chamber, and protrudes into the opening integrally from the partition member main body. The liquid-filled type vibration damping device according to claim 1, wherein the liquid-filled type vibration damping device is configured to be elastically deformed by a pressure difference in the orifice to expand and contract a part of the flow path of the orifice.

Images