JP4011954B2 - Fluid filled vibration isolator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluid-filled vibration isolator mainly used for vibration-proof support of a vibrating body such as an automobile engine.
[0002]
[Prior art and problems to be solved by the invention]
Generally, a fluid-filled vibration isolator is made of a rubber material, and includes a first mounting bracket that is attached to a vibration generating body side such as an engine and a cylindrical second mounting bracket that is attached and fixed to a support side such as a vehicle body frame. The diaphragm is disposed on the lower side of the second mounting bracket so as to face the vibration isolating base, and the inner chamber between the vibration isolating base and the diaphragm is used as a fluid enclosure. The chamber is divided into two chambers on the vibration-proof substrate side and the diaphragm side by a partition member, and both chambers are connected by an orifice, and vibration is generated by the liquid flow effect between the two liquid chambers and the vibration-damping substrate vibration control effect by the orifice It is configured to perform a damping function.
[0003]
In such a fluid-filled vibration isolator, the partition member is configured by an elastic film as a valve member that reciprocates and a pair of upper and lower lattice members that restrict the movement of the elastic film. The vibration isolator having such an elastic film allows fluid to flow between the two chambers through the orifice under a large amplitude vibration having a low frequency such as vibration caused by road surface unevenness when the vehicle is running. Demonstrates vibration damping function. On the other hand, the above-mentioned orifice does not function under a high-amplitude vibration having a high frequency such as vibration caused by the engine speed, and exhibits a vibration damping function by reciprocating deformation of the elastic film.
[0004]
Regarding this type of vibration isolator, Japanese Patent Application Laid-Open No. 6-221368 discloses a pair of upper and lower orifice members that have a lattice in the center and form an orifice channel in the outer periphery as a partition member that partitions the upper and lower liquid chambers, A configuration comprising an elastic membrane held between both orifice members is disclosed. In this vibration isolator, an orifice member made of the same material is fitted to set the orifice channel and the movable gap between the elastic membranes.To increase the fitting accuracy, the fitting surface is cut, There was no choice but to sacrifice the dimensional accuracy of the movable gap of the elastic membrane. In other words, in this case, the gap dimensions when combined are set by the respective dimension settings of the upper and lower orifice members to be fitted. Therefore, especially when parts with large manufacturing tolerances are combined, the dimensional accuracy of the movable gap It was not easy to ensure.
[0005]
This invention is made | formed in view of the above point, and it aims at improving the dimensional accuracy of the movable gap for the elastic film in a partition member.
[0006]
[Means for Solving the Problems]
The fluid-filled vibration isolator of the present invention includes a first mounting member, a second mounting member having a cylindrical body, and a rubber member that is interposed between the mounting members and joins both mounting members. A vibration base, a diaphragm attached to the second attachment member so as to face the vibration prevention base, a fluid sealing chamber provided between the vibration prevention base and the diaphragm inside the second attachment member, The fluid sealing chamber is fitted to the inner periphery of the second mounting member to partition the fluid sealing chamber into a first chamber on the vibration-proof base side and a second chamber on the diaphragm side, and the first chamber and the second chamber communicate with the outer peripheral portion. A partition member that forms an orifice flow path, the partition member partitioning the first chamber and the second chamber, and a first member disposed on the vibration-proof substrate side with respect to the elastic film, It is arranged on the diaphragm side with respect to the elastic membrane, and the peripheral portion is connected to the second mounting member. And a second member that presses the peripheral edge of the first member against the fluid sealing chamber side peripheral edge of the anti-vibration base, so that either one of the first member or the second member is provided. A concave portion for accommodating the elastic film is provided on the other side, a flat portion that abuts the opening end surface is provided on the other side so as to close the opening of the concave portion, and the flat portion is brought into contact with the opening end surface, A gap is formed between the first member and the second member to limit the displacement of the elastic film, and a gap dimension is defined only by the depth of the recess , and the first member is disposed on the outer peripheral portion. A vertical wall that blocks the flow in the circumferential direction of the orifice channel is provided, the front end of the vertical wall is extended in full width, and the front end of the vertical wall excluding the extension is brought into contact with the second member without against the opening edge of the hole by inserting the extension into the hole provided in the second member It is, thereby preventing leakage of the liquid in the circumferential direction of the orifice passage in the vertical wall, it is obtained by positioning in the rotational direction and the first member and the second member.
[0007]
In the vibration isolator of the present invention, in the partition member that forms the orifice channel on the outer peripheral portion, the movable gap for the elastic film depends on the depth of the recess provided in either the first member or the second member. Its dimensions are defined. That is, the dimension which controls the displacement of the elastic film can be set only on one side of the first member and the second member. Therefore, the dimensional accuracy of the movable gap can be improved compared to the case where the dimension is set by a combination of both. High dimensional accuracy is also required for the movable gap of the elastic film due to the recent advancement of the required performance of vehicles, and the present invention can meet such a demand with a simple combination at low cost.
[0008]
In the vibration isolator of the present invention, the first member and the second member can be formed of different materials. In this case, by providing the concave portion in a member having a small manufacturing tolerance, only one member having high accuracy is provided. The movable gap can be set with.
[0009]
For example, the concave portion may be provided in the first member and the first member may be formed of resin, and the flat portion may be provided in the second member and the second member may be formed of metal. In this case, the second member to be caulked and fixed can be formed of a metal such as a pressed steel plate or an aluminum cast product, thereby ensuring the strength to withstand caulking. On the other hand, about the 1st member which sets the dimension of a movable clearance gap, the dimension accuracy of a movable clearance gap can be ensured, without cutting, by forming with resin with good dimensional accuracy. Moreover, weight reduction can be achieved by forming with resin.
[0010]
In the vibration isolator of the present invention, it is preferable that the first member and the second member are basically configured so as not to contact at a portion other than the contact portion between the flat portion and the recess opening end surface . Thus, a part is made to contact in order to position both in a rotation direction.
[0011]
In other words, in the present invention, the first member includes a vertical wall that blocks the flow in the circumferential direction of the orifice channel at the outer peripheral portion, the tip of the vertical wall is extended, and the extended portion is used as the second member. It inserts in the hole provided in the peripheral part of this, and it is made for an extension part to contact the opening edge of the said hole, and, thereby , can position a 1st member and a 2nd member in a rotation direction. Further, in this case, since the vertical wall is extended to the second member side, undesired leakage of fluid from between the front end of the vertical wall and the second member can be prevented by this extension portion.
[0012]
Further, a hook may be provided on the extension portion of the vertical wall, and the hook may be hooked on the opening edge of the hole, thereby preventing the first member and the second member from falling off and preventing rotation during manufacture. It becomes possible.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a longitudinal sectional view of a fluid filled type vibration damping device according to an embodiment of the present invention. This vibration isolator includes a first mounting bracket 10 that is attached to a vibration generating body side such as an engine, and a second mounting bracket 12 that has a cylindrical body portion that is mounted and fixed to a support side such as a vehicle body frame. These are coupled via a vibration isolating substrate 14.
[0015]
The second mounting bracket 12 includes a cylindrical bracket 16 and a bottom bracket 18 fastened to the lower end 16a thereof by caulking means, and mounting bolts 19 are provided on the bottom bracket 18 in a protruding manner.
[0016]
The first mounting bracket 10 is a plate-like member disposed above the axial center portion of the second mounting bracket 12 with a predetermined interval, and a mounting bolt 20 protrudes upward at the center thereof. Yes.
[0017]
The anti-vibration base 14 has a substantially frustoconical shape, the first mounting bracket 10 is fixed to the upper surface thereof by vulcanization molding means, and the upper end portion of the second mounting bracket 12 is vulcanized molding means on the lower end outer peripheral portion. It is fixed by. In the case of the figure, the upper end portion 16b of the cylindrical metal fitting 16 is formed in a taper shape, and the lower outer periphery of the vibration-proof base 14 is vulcanized and bonded to the upper end portion 16b. On the inner wall surface of the second mounting bracket 12, a thin film rubber portion 14 a extending from the vibration isolating base 14 in a thin film shape is provided.
[0018]
A diaphragm 22 made of a rubber film is mounted on the lower side of the second mounting bracket 12 so as to face the vibration-proof base 14. The diaphragm 22 includes a ring-shaped reinforcing metal fitting 24 on the outer peripheral portion, and the reinforcing metal fitting 24 is attached to the second attachment metal fitting 12 by being caulked and fixed to a caulking portion between the cylindrical metal fitting 16 and the bottom metal fitting 18. .
[0019]
Inside the second mounting bracket 12, a fluid sealing chamber 26 is formed between the diaphragm 22 and the vibration isolation base 14, and a liquid as a fluid is sealed in the fluid sealing chamber 26. A disc-shaped partition member 30 having an orifice channel 28 on the outer periphery is fitted in a liquid-tight manner on the inner periphery of the second mounting member 12 in the fluid sealing chamber 26. The fluid sealing chamber 26 is partitioned by the partition member 30 into a first chamber 26 a on the vibration-proof base side and a second chamber 26 b on the diaphragm side, and both chambers 26 a and 26 b are communicated with each other through an orifice channel 28. Yes.
[0020]
The partition member 30 includes a disc-shaped rubber film 32 as a valve member that partitions the first chamber 26a and the second chamber 26b, an upper member 34 disposed on the vibration-proof base 14 side with respect to the rubber film 32, and a rubber film. 32 and a lower member 36 disposed on the diaphragm 22 side.
[0021]
In the present embodiment, the upper member 34 is a molded product of resin (for example, PPA (polyphthalamide)), and is disposed relative to the upper surface of the rubber film 32 as shown in FIG. The central shelf 34a that restricts the displacement of the nozzle and the peripheral edge 34b that includes a groove 38 for forming the orifice channel 28. The peripheral edge 34b has a substantially cylindrical shape, and includes a groove 38 extending on the outer circumferential surface thereof in the circumferential direction over two upper and lower circumferences. A space surrounded by the groove 38 and the thin-film rubber portion 14 a of the vibration isolating base 14 is an orifice channel 28. The peripheral edge 34b is also provided with an opening 40 that allows the orifice channel 28 and the first chamber 26a to communicate with each other by cutting out a part of the upper wall.
[0022]
The central shelf 34a of the upper member 34 is spanned so as to divide the inside of the cylindrical peripheral edge 34b vertically in the axial central portion, and thus has a disk shape. The central shelf 34a is formed in a lattice shape, and includes a plurality of through holes 42 formed by the lattice. A recess 44 for accommodating the rubber film 32 is provided on the lower surface of the central shelf 34 a, that is, the surface facing the rubber film 32. A flat opening end face 46 having a ring shape is secured around the recess 44.
[0023]
The lower member 36 is a press-formed body of a metal plate in the present embodiment, and is arranged relative to the lower surface of the rubber film 32 to restrict a downward displacement thereof, and a disk-shaped central shelf 36a; It comprises a peripheral edge portion 36b fixed by caulking between the cylindrical metal fitting 16 and the bottom metal fitting 18, and an orifice channel 28 is provided between the central shelf portion 36a and the peripheral edge portion 36b together with the peripheral edge portion 34b of the upper member 34. A middle step 36c to be formed is formed. The lower member 36 is configured such that the upper end surface of the peripheral portion 34b of the upper member 34 is pressed against the stepped portion 14b provided on the lower peripheral portion of the vibration isolating base 14 by the caulking and fixing of the peripheral portion 36b. It has become.
[0024]
The central shelf portion 36a of the lower member 36 is provided so as to protrude upward from the middle step portion 36c, and is disposed on the lower inner side of the peripheral edge portion 34b so as to face the central shelf portion 34a of the upper member 34. The central shelf 36 a of the lower member 36 is a flat portion that comes into contact with the opening end surface 46 so as to close the opening of the recess 44 of the upper member 34, and accommodates the rubber film 32 like the upper member 34. There is no recess for. Therefore, by pressing the central shelf 36a of the lower member 36 against the opening end surface 46 of the concave portion 44 of the upper member 34 by the caulking, as shown in FIG. A gap 48 that restricts the displacement of the rubber film 32 is formed between them, and the dimension X of the gap 48 is defined only by the depth of the recess 44.
[0025]
The central shelf 36a of the lower member is formed in a lattice shape similar to the central shelf 34a of the upper member 34, and includes a plurality of through holes 50 formed by the lattice. In addition, an opening 52 for communicating the orifice channel 28 and the second chamber 26b is provided in the middle step 36c of the lower member 36.
[0026]
The rubber film 32 is disposed in the gap 48, and the vertical displacement is restricted between the upper and lower central shelves 34a and 36a. The dimension X of the gap 48 is set to be slightly larger than the thickness of the rubber film 32, thereby enabling the rubber film 32 to be displaced vertically.
[0027]
On the surface of the rubber film 32, protruding ridges 54 are formed so as to protrude integrally so as to contact the opposing surfaces of the upper and lower central shelves 34 a and 36 a and surround the outer circumferences of the through holes 42 and 50 over the entire circumference. Thus, fluid leakage between the adjacent through holes 42 and 50 is prevented particularly under a large amplitude vibration having a low frequency.
[0028]
In the vibration isolator of the present embodiment configured as described above, the dimension X of the gap 48 that accommodates the rubber film 32 is defined only by the depth of the recess 44 provided in the upper member 34. Therefore, the lower member 36 can be made of metal to ensure the rigidity to withstand the caulking strength, and the upper member 34 can be made of resin to ensure the dimensional accuracy of the movable gap without cutting. it can.
[0029]
In the above vibration isolator, since the movable gap dimension of the rubber film 32 is defined only by the depth of the recess 44 of the upper member 34, the upper member 34 and the lower member 36 have the opening end surface 46 of the recess 44 and the central shelf portion. It abuts only at the abutting part with the peripheral part of 36a, and it is comprised so that both may not contact in another site | part. In this case, the upper member 34 and the lower member 36 are positioned by the inner peripheral surface of the cylindrical metal fitting 16 in the radial direction and between the stepped portion 14b and the caulking portion of the vibration-proof base 14 in the height direction. Made in
[0030]
And about a rotation direction, as shown in FIG. 3, it can position by extending the lower end of the vertical wall 56 in the peripheral part 34b of the upper member 34. As shown in FIG. The vertical wall 56 is a wall for guiding the liquid to the opening 52 of the lower member 36 by blocking the flow in the circumferential direction at the lower end portion of the orifice channel 28. The lower end of the vertical wall 56 is extended below the lower surface of the peripheral edge 34b, the extension 58 is inserted into the opening 52 of the lower member 36, and abutted against one of the opening edges. While positioning the lower member 36 in the rotation direction, the opening area of the opening 52 can be secured.
[0031]
Further, since the upper member 34 and the lower member 36 are brought into contact with each other only at the abutting portion between the opening end surface 46 of the recess 44 and the peripheral edge portion of the central shelf 36a, as shown in FIG. A gap is secured between the lower end of the peripheral edge 34 b of the member 34 and the middle step 36 c of the lower member 36. Although it is assumed that the liquid flowing through the orifice channel 28 leaks without being completely blocked by the vertical wall 56 due to this gap, such a leak is caused by extending the lower end of the vertical wall 56 as described above. Can be prevented.
[0032]
Further, as shown in FIG. 3C, a hook 60 may be provided on the extension 58 of the vertical wall 56, and the hook 60 may be hooked on the opening edge of the opening 52 of the lower member 36. In addition to preventing rotation, it is possible to prevent the upper member 34 and the lower member 36 from falling off during manufacturing.
[0033]
FIG. 4 is a cross-sectional view of a vibration isolator according to another embodiment. In this embodiment, resin is employed for the upper member 34 as in the above embodiment, but an aluminum cast product is employed for the lower member 36 instead of the pressed steel plate.
[0034]
In this embodiment, a groove 38b for forming the orifice channel 28 is provided not only on the upper member 34 but also on the peripheral portion of the lower member 36. Specifically, as shown in FIGS. 4 and 5, the upper member 34 has a peripheral edge provided with the central shelf 34 a and a groove 38 a for forming the upper flow path 28 a among the upper and lower orifice flow paths 28. Part 34b. On the other hand, the lower member 36 includes the central shelf portion 36a and a peripheral portion 36b having a groove 38b for forming the lower flow path 28b, and is located on the upper side of the peripheral portion 36b having a substantially U-shaped cross section. The wall forms the upper flow path 28 a together with the peripheral edge 34 b of the upper member 34, and the lower wall extends outward and is fixed by caulking at the caulking portion of the second mounting bracket 12.
[0035]
Also in this embodiment, the recess 44 is provided in the central shelf 36 a of the upper member 34, and the upper member 34 is abutted so as to close the opening of the recess 44 with the flat central shelf 36 a of the lower member 36. A gap 48 for limiting the displacement of the rubber film 32 is formed between the lower member 36 and the lower member 36, and the dimension X of the gap 48 is defined only by the depth of the recess 44.
[0036]
In this case, as shown in FIG. 5, the lower end of the vertical wall 62 provided on the upper member 34 is extended as the positioning of the upper member 34 and the lower member 36 in the rotational direction. The vertical wall 62 is a wall provided to guide liquid from the upper flow path 28a to the lower flow path 28b. The lower end of the vertical wall 62 is extended, and the extended portion 64 is connected to the lower member 36. The upper member 34 and the lower member 36 are positioned in the rotation direction by being inserted into the positioning openings 66 provided in the peripheral edge portion 36b. This also prevents liquid leakage in the gap between the vertical wall 62 and the peripheral edge 36 b of the lower member 36.
[0037]
In this embodiment, in addition to the effect of the embodiment shown in FIG. 1 described above, since the upper member 34 and the lower member 36 are both molded products, an effect that the degree of freedom in design is high can be obtained.
[0038]
【The invention's effect】
In the fluid-filled vibration isolator of the present invention, the dimension that regulates the displacement of the elastic film can be set only on one side of the first member and the second member, so the dimension of the movable gap of the elastic film Accuracy can be improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a vibration isolator according to an embodiment of the present invention.
2A is an exploded cross-sectional view of the partition member according to the embodiment, FIG. 2B is a cross-sectional view in the combined state, and FIG. 2C is an enlarged view of a portion A in FIG.
3A is a side view of an upper member in the same embodiment, FIG. 3B is a side view of a partition member, and FIG. 3C is an enlarged view of a portion B in FIG.
FIG. 4 is a cross-sectional view of a vibration isolator according to another embodiment.
5A is an exploded side view of a partition member according to another embodiment, and FIG. 5B is a side view of the assembled state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... 1st mounting bracket 12 ... 2nd mounting bracket 14 ... Vibration-proof base 22 ... Diaphragm 26 ... Fluid enclosure 28 ... Orifice 30 ... Partition member 32 ... Rubber film 34 ... Upper member 36 …… Lower member 36a …… Center shelf 44 …… Recess
46 ...... Open end face
48 …… Gap
56, 62 ... Vertical walls 58, 64 ... Extension parts 52, 66 ... Opening 60 ... Hook

Claims (4)

A first mounting member; a second mounting member having a cylindrical body; a vibration isolating base made of a rubber material interposed between the mounting members and connecting the mounting members; and opposed to the vibration isolating base. A diaphragm attached to the second attachment member, a fluid sealing chamber provided between the vibration isolating base and the diaphragm inside the second attachment member, and an inner periphery of the second attachment member A partition member that divides the fluid sealing chamber into a first chamber on the vibration-isolating base side and a second chamber on the diaphragm side, and forms an orifice channel that communicates the first chamber and the second chamber on the outer periphery. Prepared,
The partition member is disposed on the diaphragm side with respect to the elastic film for partitioning the first chamber and the second chamber, the first member disposed on the vibration isolation base with respect to the elastic film, and the peripheral portion is disposed on the diaphragm side. A second member that presses the peripheral edge of the first member against the fluid sealing chamber side peripheral edge of the anti-vibration base by being caulked and fixed to the second mounting member;
The provided with a recess for receiving the elastic membrane, the flat portion in contact with the opening end surface so as the other to close the opening of the recess provided in one of the first member and the second member of the said opening A gap that limits the displacement of the elastic film between the first member and the second member by contacting the flat surface portion with an end face, and a gap dimension is defined only by the depth of the recess. Form the
The first member is provided with a vertical wall that blocks the flow in the circumferential direction of the orifice channel at the outer peripheral portion, and the front end of the vertical wall excluding the extended portion is extended at the full width. By inserting the extension into a hole provided in the second member without contacting the second member and hitting the opening edge of the hole, the circumferential direction of the orifice channel in the vertical wall is increased . While preventing leakage of liquid, the first member and the second member were positioned in the rotational direction,
A fluid-filled vibration isolator characterized by that.   2. The fluid filled type vibration damping device according to claim 1, wherein the first member and the second member are made of different materials.   The said recessed part was provided in the said 1st member, this 1st member was formed with resin, the said plane part was provided in the said 2nd member, and this 2nd member was formed with the metal of Claim 2 characterized by the above-mentioned. Fluid-filled vibration isolator.   The fluid-filled vibration isolator according to any one of claims 1 to 3, wherein a hook is provided on an extension of the vertical wall, and the hook is hooked on an opening edge of the hole.

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