JPH0669478U - Liquid-filled mount - Google Patents

Abstract

(57) [Abstract] [Purpose] In addition to having low dynamic spring characteristics to effectively reduce high frequency vibrations, it also has high damping characteristics (large loss coefficient) to effectively reduce low frequency vibrations. (EN) Provided is a liquid-filled mount capable of ensuring reduction of high-frequency vibration transmission force up to a higher frequency range. [Structure] An orifice 40a that contributes to a damping characteristic for low-frequency vibration is formed at the center side of a first member 41 and a second member 42 that constitute a partitioning means 40. In order to secure as large as possible an effective area for forming the first action hole 41e and the second action hole 42f that contribute to the reduction of the transmission force for high frequency vibration in the first member 41 and the second member 42, the first member 41 is provided. Also, the peripheral edge of the second member 42 extends substantially to the inner peripheral surface of the second mounting member 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid-filled mount for use in, for example, an automobile suspension system.

[0002]

[Prior art]

 The engine of a car is mounted on the vehicle body through an engine mount that exhibits anti-vibration properties. This engine mount has low dynamic spring characteristics to effectively reduce vibrations in high frequencies and high damping characteristics (large loss coefficient) to reduce vibrations in low frequencies effectively. Liquid-filled engine mounts equipped with this are known. As shown in FIG. 5, this liquid-filled engine mount includes a first mounting member 81, a bottomed cylindrical second mounting member 82 having an open end, a first mounting member 81, and a second mounting member 82. The main body rubber portion 84 that forms a closed working chamber 83 together with the opening end of the second mounting member 82, and the working chamber 83 that is liquid-tightly fixed to the second mounting member 82 and the liquid chamber 85. A main liquid chamber 85a is formed between the diaphragm 87, which is made of a rubber elastic body and is partitioned into an air chamber 86, and the main body rubber portion 84, which is liquid-tightly fixed to the second mounting member 82. A sub-liquid chamber 85b is formed in the sub-liquid chamber 85b to partition the liquid chamber 85 into a main liquid chamber 85a and a sub-liquid chamber 85b, and a liquid 88 enclosed in the liquid chamber 85.

The partitioning means 90 is disposed on the side of the main liquid chamber 85 a, and has a first member 91 made of a hat-shaped plate-shaped member whose peripheral edge contacts the inner peripheral surface of the second mounting member 82. , A second member 92 made of a hat-shaped plate-shaped member arranged on the side of the sub-liquid chamber 85b of the first member 91, and a movable plate 93 arranged between the first member 91 and the second member 92. It consists of and.

The first member 91 faces the main liquid chamber 85 a and has an upper surface portion including a peripheral upper surface portion 94 a and a central upper surface portion 94 b higher than the peripheral upper surface portion 94 a, and an inner peripheral surface of the second mounting member 82. And a side surface portion 95 that abuts on the seal rubber portion 89 disposed on the. Further, the second member 92 has an upper surface portion 96 whose peripheral edge portion abuts on the peripheral edge upper surface portion 94 a of the first member 91, and a side surface portion 97 having a smaller outer diameter than the side surface portion 95 of the first member 91. ing.

Then, the movable plate 93 is vertically moved (upwardly and downwardly in FIG. 5) in the accommodation space formed between the upper surface portion 96 of the second member 92 and the central upper surface portion 94b of the first member 91. It is housed so that it can be moved. A plurality of first action holes (not shown) are formed in the central upper surface portion 94b of the first member 91, and a plurality of second action holes (not shown) are also formed in the upper surface portion 96 of the second member 92. Is provided, and the accommodation space communicates with the main liquid chamber 85a and the sub liquid chamber 85b. Further, one communication hole (not shown) is formed in each of the peripheral upper surface portion 94a of the first member 91 and the side surface portion 97 of the second member 92. As a result, an annular orifice 98 that connects the main liquid chamber 85a and the sub liquid chamber 85b is formed between the side surface portion 95 of the first member 91 and the side surface portion 97 of the second member 91. The communication holes formed in the peripheral upper surface 94a of the first member 91 and the side surface 97 of the second member 92 are provided at positions facing each other by 180 ° in order to maximize the flow path length of the orifice 98. Has been.

In this engine mount, the first mounting member 81 is bolted to the engine bracket, and the second mounting member 82 is bolted to the vehicle body side. When high-frequency, small-amplitude vibrations are input to the engine mount and the volume of the main liquid chamber 85a changes, the pressure applied to the fluid 88 in the main liquid chamber 85a causes the first action of the first member 91. It acts on the movable plate 93 through the hole, and is transmitted to the side of the auxiliary liquid chamber 85b through the second action hole of the second member 92 by the movement of the movable plate 53. Due to such a change in the internal volume of the main liquid chamber 85a (absorption of fluid pressure) due to the movement of the movable plate, the spring characteristics of the main body rubber portion 84 can be effectively utilized to lower the dynamic spring constant of the entire mount. In this case, the transmission power of high frequency vibration can be reduced, and the vibration noise in the high frequency range can be effectively reduced.

On the other hand, when a vibration of a large amplitude at a low frequency is input to the engine mount and the volume of the main liquid chamber 85a changes significantly, the movable plate 93 is prevented from freely moving, and this causes the movable plate 93 to pass through the orifice 98. The liquid 88 flows from the main liquid chamber 85a to the sub liquid chamber 85b. At this time, the flow resistance or the like can increase the loss coefficient of the mount as a whole to increase the damping characteristics, and the vibration noise in the low frequency range can be effectively reduced.

[0008]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional liquid-filled engine mount, the frequency that can reduce the transmission force of high-frequency vibration according to the hole area of the first action hole of the first member 91 or the second action hole of the second member 92. The area changes. That is, the larger the hole area, the more the spring characteristic moves to the higher frequency side, and the higher the frequency range in which the transmission force of high frequency vibration can be reduced can be secured.

However, the side surface portion 95 of the first member 91 is constrained by the inner peripheral surface of the second mounting member 82 to restrict the area of the upper surface portion of the first member 91, and the side surface portion 95 of the first member 91 is restricted. Since it is necessary to secure the orifice 98 between the second member 92 and the side surface portion 97 of the second member 92, the area of the first working hole of the first member 91 or the second working hole of the second member 92 is increased. Is limited.

Therefore, in the conventional liquid-filled engine mount, there is a limit to increasing the frequency range in which the transmission force of high frequency vibration can be reduced, and the reduction of the transmission force of high frequency vibration is ensured in a higher frequency range. I could not meet the need to do. The present invention has been made in view of the above circumstances, and has a low dynamic spring characteristic for effectively reducing high-frequency vibration, and a high damping characteristic (large loss) for effectively reducing low-frequency vibration. It is an object of the present invention to provide a liquid-filled mount that has a coefficient) and that can reduce the transmission force of high-frequency vibrations to a higher frequency range.

[0011]

[Means for Solving the Problems] A liquid-filled mount according to the present invention for solving the above-mentioned problems includes a first mounting member, a second mounting member having a bottomed tubular shape having an open end, and the first mounting member. A body rubber portion that connects the open end of the second attachment to form a closed working chamber together with the second attachment, and liquid-tightly secures the inner peripheral surface of the second attachment. The main liquid chamber is liquid-tightly fixed to the inner peripheral surface of the second fixture by a diaphragm made of a rubber elastic body that divides the working chamber into a liquid chamber and an air chamber. And a partition means for forming a sub-liquid chamber between the diaphragm and the diaphragm to partition the liquid chamber into the main liquid chamber and the sub-liquid chamber, and a liquid enclosed in the liquid chamber. In the enclosed mount, the partition means is disposed on the main liquid chamber side, and a peripheral edge of the partition means extends substantially to an inner peripheral surface of the second fixture. Then, a plate-shaped first member having a first central hole and a plurality of first action holes penetrating in the thickness direction, and arranged at a predetermined interval on the sub liquid chamber side of the first member. , Its peripheral edge extends substantially to the inner peripheral surface of the second fixture to form an accommodation space between the first fixture and the first member, and communicates with the first central hole to form the main liquid chamber and the main liquid chamber. A plate-shaped second member having a second central hole forming an orifice communicating with the sub liquid chamber and a plurality of second action holes penetrating in the thickness direction, and the first member in the accommodation space. The movable plate is housed so as to be movable in the thickness direction and has a movable plate having an orifice hole in the center.

[0012]

[Action]

 In the above-mentioned conventional liquid-filled mount, since the annular orifice is formed between the inner side in the circumferential direction of the first member and the outer side in the circumferential direction of the second member, the second working hole should be formed in the second member. The effective area that can be used has to be reduced in order to secure the cross-sectional area of the orifice.

On the other hand, in the liquid-filled mount according to the present invention, the peripheral edge of the first member constituting the partition means extends substantially to the inner peripheral surface of the second attachment, and the second member constituting the partition means is formed. The peripheral edge of the member extends substantially to the inner peripheral surface of the second fixture. An orifice that connects the main liquid chamber and the sub liquid chamber is provided by the first central hole of the first member and the second central hole of the second member. Therefore, in each of the first member and the second member, it is possible to secure the effective area for forming the first action hole or the second action hole as large as possible. Therefore, the hole areas of the first action hole and the second action hole can be made as large as possible, and the frequency range in which the transmission force of high frequency vibration can be reduced can be increased.

On the other hand, the damping characteristic in the low frequency range also flows between the main liquid chamber and the sub liquid chamber via the orifice formed by the first central hole of the first member and the second central hole of the second member. It can be effectively secured by the flow resistance of the liquid to be used.

[0015]

【Example】

 Hereinafter, a specific embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid-filled mount of the present invention is used as an engine mount. The liquid-filled mount according to the present embodiment includes a first mounting member 1 mounted on an engine bracket, a second mounting member 2 having a bottomed tubular shape having an open end, a first mounting member 1 and a second mounting member 2. The main body rubber portion 4 that connects the open end to form a closed working chamber 3 together with the second mounting member 2, and the working chamber 3 fixed to the second mounting member 2 into the liquid chamber 5 and the air chamber 6. The main liquid chamber 5a is formed between the diaphragm 7 made of a rubber elastic body and the main body rubber portion 4 fixed to the second mounting member 2 and the sub liquid chamber 5b is formed between the diaphragm 7 and the main body rubber portion 4. A disk-shaped partitioning means 40 for partitioning the liquid chamber 5 into a main liquid chamber 5a and a sub-liquid chamber 5b, and a liquid (incompressible fluid such as water, alkylene glycol, or silicone oil) 8 enclosed in the liquid chamber 5 Is equipped with.

A bolt 12 for attaching the first mounting member 1 to the engine bracket is fitted and fixed to a through hole 11 formed in a substantially central portion of the first mounting member 1, and is positioned next to the bolt 12. The positioning pin 13 is fitted and fixed. Further, a metal cap member 14 is fixed to the lower surface of the first mounting member 1 and covers the bolt 12 and the main body rubber portion 4 is vulcanized and adhered to the outer peripheral surface of the bolt 12.

The second mounting member 2 has a substantially cylindrical shape having an enlarged diameter portion 21a on one end side (upper side in FIG. 1) and a first bulging portion 21b bulging in a U-shaped cross section on the other end side. And a pot-like metal fitting 22 having a second bulging portion 22a bulging in an L-shaped cross section which is crimped into the first bulging portion 21b of the tubular metal fitting 21. ing. The open end on one end side of the tubular metal fitting 21 is closed by vulcanizing and adhering the main body rubber portion 4, and the inner peripheral surface of the tubular metal fitting 21 is integrally formed with the main body rubber portion 4 and vulcanizing and adhering. The thin-walled seal rubber portion 4a is provided. A bolt 22c for mounting the second mounting member 2 on the vehicle body side is fitted and fixed to a through hole 22b formed in the substantially central portion of the pot-shaped metal member 22, and a positioning pin 22d for positioning next to the bolt 22c. Are fitted and fixed.

The main body rubber portion 4 has a substantially tubular shape, the upper end of which is vulcanized and adhered to the lower surface of the first mounting member 1 and the outer peripheral surface of the cap member 14, and the lower end of which is the tubular shape of the second mounting member 2. The metal fitting 21 is vulcanized and adhered to the inner peripheral surface of the expanded diameter portion 21a. The partition means 40 characterizing the liquid-filled mount of this embodiment is arranged on the main liquid chamber 5a side, and its peripheral edge is arranged on the inner peripheral surface of the tubular metal fitting 21 of the second mounting metal fitting 2. And a first member 41 made of a hat-shaped plate-shaped metal fitting that abuts on the seal rubber portion 4a, and a hat-shaped plate-shaped metal fitting arranged on the sub-liquid chamber 5b side of the first member 41 at a predetermined interval. It is composed of a second member 42 and a movable plate 43 arranged between the first member 41 and the second member 42.

As shown in FIG. 2, the first member 41 includes a disc-shaped first upper surface portion 41 a facing the main liquid chamber 5 a and a seal rubber portion 4 a arranged on the inner peripheral surface of the tubular metal fitting 21. Has a first side surface portion 41b that comes into liquid-tight contact with the first side surface portion 41b and a first flange portion 41c that projects radially outward from the first side surface portion 41b and also comes into liquid-tight contact with the seal rubber portion 4a. . A first central hole 41 d penetrating in the thickness direction is formed in the center of the first upper surface portion 41 a of the first member 41, and a large number of first action holes 41 e are formed on the entire surface of the first upper surface portion 41 a. There is. The first action hole 41e is arranged on the first upper surface portion 41a so that the hole area is as large as possible. Specifically, as shown in the plan view of FIG. 3, eight holes with a small diameter are arranged in the circumferential direction on the center side, and eight holes with a large diameter are also arranged outside the same in the circumferential direction. Further, 16 holes having a diameter of these intermediate sizes are arranged on the outer side thereof.

The second member 42 has a substantially disc-shaped second upper surface portion 42 a, a second side surface portion 42 b that abuts on an inner peripheral surface of the first side surface portion 41 b of the first member 41, and a second side surface portion 42 b. And a second flange portion 42c that protrudes outward in the radial direction. At the center of the second upper surface portion 42a of the second member 42, an annular projection 42d is integrally projected upward (upward in FIG. 1) to form a second central hole 42e on the center side. The tip of the annular protrusion 42 d is in contact with the peripheral edge of the first central hole 41 d of the first member 42. Further, a large number of second action holes 42f are formed on the entire surface of the second upper surface portion 42a of the second member 42. Like the first action hole 41e, the second action hole 42f is also provided with eight holes having a small diameter in the circumferential direction on the center side and a hole having a large diameter on the outside thereof so that the hole area is as large as possible. Eight holes are similarly arranged in the circumferential direction, and 16 holes having a diameter of the intermediate size are arranged on the outer side (see FIG. 4).

Since the first member 41 and the second member 42 are overlapped with each other at a predetermined interval as described above, the first central hole 41d of the first member 41 and the second central hole 42e of the second member 42 are formed. As a result, an orifice 40a that connects the main liquid chamber 5a and the sub liquid chamber 5b is formed, and an annular accommodation space 40b is formed. A movable plate 43 having an orifice hole 43a in the center is housed in the annular housing space 40b. The plate thickness of the movable plate 43 is set smaller than the distance between the first member 41 and the second member 42, and is movable in the housing space 40b in the plate thickness direction.

The diaphragm 7 is formed of an elastically deformable rubber thin film in a hat shape. The air chamber 6 formed below the diaphragm 7 communicates with the outside through a through hole (not shown) formed in the pot-shaped metal fitting 22 of the second mounting member 2. The partition means 40 and the diaphragm 7 are liquid-tight together with the seal rubber portion 4a between the inner surface of the first bulging portion 21b of the tubular metal fitting 21 and the inner surface of the second bulging portion 22a of the pot-shaped metal fitting 22. It is clamped and fixed.

The liquid-and-others type mount of this embodiment is manufactured as follows. First, the first mounting member 1 to which the bolt 12 and the positioning pin 13 are fitted and fixed, and the tubular member 21 are placed in a predetermined position of the cavity of the vulcanization mold, and the cavity is filled with a rubber material. The main body rubber portion 4 and the seal rubber portion 4a are vulcanized and molded by a predetermined vulcanization operation, and these are vulcanized and bonded to the first mounting member 1 and the tubular metal member 21. At this time, the first bulging portion 21b of the tubular fitting 21 is not yet formed. Then, in the liquid tank containing the liquid 8, the first member 41, the movable plate 43, the second member 42 and the diaphragm 7 are fitted in this order from the lower end side of the opening of the tubular metal fitting 21, and further the bolt 22c and the positioning pin are inserted. After fitting the pot-shaped metal fitting 22 into which 22d is fitted and fixed and the second bulge portion 22a is formed, the lower end of the tubular metal fitting 21 is caulked to form the first bulge portion 21b having a U-shaped cross section. By doing so, the second bulging portion 22a of the pot-shaped metal fitting 22 is engaged with the inside of the first bulging portion 21b. In this way, by caulking and fixing the pot-shaped metal fitting 22 to the tubular metal fitting 21, between the inner surface of the first bulged portion 21b of the tubular metal fitting 21 and the inside of the second bulged portion 22a of the pot-shaped metal fitting 22. The seal rubber portion 4a, the partitioning means 40 and the diaphragm 7 are liquid-tightly sandwiched to complete the liquid-filled mount.

In this liquid-filled mount, the first mounting member 1 is bolted to the engine bracket, and the second mounting member 2 is bolted to the vehicle body side. When a high-frequency, small-amplitude vibration is input to the liquid-filled mount, and the volume of the main liquid chamber 5a changes, the pressure applied to the fluid 8 in the main liquid chamber 5a causes the first member 41 of the first member 41 to move. It acts on the movable plate 43 through the action hole 41e, and is transmitted to the side of the sub liquid chamber 5b through the second action hole 42f of the second member 42 by the movement of the movable plate 43. Due to the fluctuation of the internal volume of the main liquid chamber 5a (absorption of the fluid pressure) due to the movement of the movable plate 43 as described above, the spring characteristics of the main body rubber portion 4 are effectively used to lower the dynamic spring constant of the mount as a whole. Therefore, it is possible to effectively reduce the vibration noise in the high frequency range by reducing the transmission power of the high frequency vibration.

On the other hand, when a large-amplitude vibration at a low frequency is input to the liquid-filled mount and the volume of the main liquid chamber 5a changes significantly, the movable plate 43 is prevented from freely moving, which causes the orifice 40a. A large amount of liquid 8 flows from the main liquid chamber 5a to the sub liquid chamber 5b through. At this time, it is possible to increase the attenuation coefficient by increasing the loss coefficient of the mount as a whole by the flow resistance or the like, and it is possible to effectively reduce the vibration noise in the low frequency range. Further, the pressure applied to the fluid 8 in the main liquid chamber 5a acts on the diaphragm 7 via the orifice 40a and the sub liquid chamber 5b, whereby the diaphragm 7 is elastically deformed in the direction of contracting the air chamber 6, At this time, the elastic deformation of the diaphragm 7 and the flow of air in the air chamber 6 also contribute to the damping action of the low frequency vibration.

In the liquid-filled mount according to this embodiment, the first side surface portion 41 b of the first member 41 forming the partition means 40 is arranged on the inner peripheral surface of the tubular metal fitting 21 forming the second mounting member 2. The second side surface portion 42b of the second member 42 constituting the partitioning means 40 contacts the inner peripheral surface of the first side surface portion 41b of the first member 41. The orifice 40a that contributes to the damping of low-frequency vibration is provided in the central portion of the first member 41 and the second member 42. That is, the first upper surface portion 41a of the first member 41 and the second upper surface portion 42a of the second member 42 ensure a large area. Therefore, in each of the first member 41 and the second member 42, the effective area for forming the first action hole 41e or the second action hole 42f can be secured as large as possible. Therefore, the hole areas of the first action hole 41e and the second action hole 42f can be maximized to increase the frequency range in which the transmission force of high frequency vibration can be reduced.

In addition, in the liquid-filled mount of this embodiment, when the first member 41 and the second member 42 are assembled, the first member 41 and the second member 42 are separated from each other like the conventional mount described above. Since it is not necessary to align in the circumferential direction, it is easy to assemble and contributes to the improvement of production workability. In the embodiment described above, the annular protrusion 42d is formed in the center of the second member 42 constituting the partitioning means 40, and the annular protrusion 42d is brought into contact with the first member 41, whereby the first member 41 and the second member Although the example in which the annular accommodation space 40b is formed between the accommodation space 40 and 42 has been described, the accommodation space 40b does not need to be circular. Therefore, the annular protrusion 42d of the second member 42 may be eliminated to form the second central hole 42e as a mere through hole.

In addition, although the above-described embodiment shows an example in which the liquid-filled type vibration damping mount of the present invention is applied to an engine mount, the present invention may be applied to a strat mount, a member mount, or the like without departing from the gist of the present invention. It can be applied to other liquid-filled type anti-vibration mounts.

[0029]

[Effect of device]

 As described above in detail, in the liquid-filled mount of the present invention, the orifice that contributes to the damping characteristic for low frequency vibration is formed on the center side of the first member and the second member that constitute the partitioning means, and high frequency vibration is achieved. The effective area for forming the first action hole and the second action hole in the first member and the second member that contributes to the damping characteristic with respect to is as large as possible. Therefore, by maximizing the hole areas of the first action hole and the second action hole as much as possible, it is possible to effectively reduce the low-frequency vibration and secure the reduction of the transmission force of the high-frequency vibration up to a higher frequency range.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a liquid-filled mount according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the liquid-filled mount according to the above embodiment.

FIG. 3 is a plan view of a first member that constitutes partitioning means in the liquid-filled mount according to the above embodiment.

FIG. 4 is a plan view of a second member that constitutes partitioning means in the liquid-filled mount according to the above embodiment.

FIG. 5 is a cross-sectional view of a conventional liquid-filled mount.

[Explanation of symbols]

1 is a first mounting bracket, 2 is a second mounting bracket, 3 is a working chamber, 4
Is a main rubber part, 5 is a liquid chamber, 5a is a main liquid chamber, 5b is a sub liquid chamber, 6 is an air chamber, 7 is a diaphragm, 8 is a liquid, 40 is a partitioning means, 40a is an orifice, 40b is a containing space,
41 is a 1st member, 41d is a 1st center hole, 41e is a 1st action hole, 42 is a 2nd member, 42e is a 2nd center hole, 42f is a 2nd action hole.

Claims (1)

[Scope of utility model registration request] 1. A second attachment by connecting a first attachment, a bottomed tubular second attachment having an opening end, and the first attachment and the opening end of the second attachment. A diaphragm made of a main body rubber portion that forms a closed working chamber together with the tool, and a rubber elastic body that is liquid-tightly fixed to the inner peripheral surface of the second mounting tool to partition the working chamber into a liquid chamber and an air chamber. And liquid-tightly fixed to the inner peripheral surface of the second attachment to form a main liquid chamber between the main body rubber portion and a sub-liquid chamber between the diaphragm and the main chamber. A partition means for partitioning the main liquid chamber and the sub-liquid chamber, and a liquid-filled mount comprising a liquid sealed in the liquid chamber, wherein the partition means is disposed on the main liquid chamber side, A plate shape whose peripheral edge extends substantially to the inner peripheral surface of the second attachment and has a first central hole and a plurality of first action holes penetrating in the thickness direction. Between the first member and the first member, the first member is disposed on the side of the sub-liquid chamber with a predetermined distance, and the peripheral edge of the first member substantially extends to the inner peripheral surface of the second fixture. A second central hole that forms an accommodation space in the housing, forms an orifice that communicates with the first central hole to connect the main liquid chamber and the sub liquid chamber, and a plurality of second action holes that penetrate in the thickness direction. A liquid-filled mount comprising: a plate-shaped second member having an opening and a movable plate that is housed in the housing space so as to be movable in the thickness direction of the first member and has an orifice hole in the center. .