JPH1078078A - Fluid charging type vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve vibration control performance and durability by embedding a stopper member and a constraining member in rubber elastic body, and forming them integrally with a connecting part which connects both of them. SOLUTION: A main shaft metal fitting 1 is disposed on a supporting member of a vehicle body so that an outer cylinder metal fitting 4 may be connected to the supporting member of an engine and a main liquid chamber 33 may be positioned at its upper part which is in the main vibration inputting direction of the engine. An intermediate metal fitting 2 and the outer cylinder metal fitting 4, which are disposed in an eccentric condition against the main shaft metal fitting 1, is moved downwards by the dead weight of the engine and so on through the deformation of a rubber elastic body 3, and becomes in a roughly coaxial condition with the main shaft metal fitting 1. If vibration acts between the main shaft metal fitting 1 and the outer cylinder metal fitting 4, the vibration is damped effectively by the elasticity action of the rubber elastic body 3 and a liquid column resonance action of liquid L which flows through the main liquid chamber 33 and a sub liquid chamber 34 through an orifice passage 35. At this time, the vibration acts in such a direction as the main metal fitting 1 approaches the main liquid chamber 33 to pressurize the liquid L in the main liquid chamber 33, and a large amount of liquid L in the main liquid chamber 33 is flown into the orifice passage 35 effectively to exhibit a vibration control effect more substantially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled type vibration damping device used as, for example, an engine mount or a cab mount of an automobile.

[0002]

2. Description of the Related Art As a conventional liquid filled type vibration damping device, for example, a device disclosed in Japanese Patent Application Laid-Open No. 2-42226 is known. The liquid filled type vibration damping device comprises a main shaft and a concave portion which is fixed to the main shaft, and which forms a main liquid chamber and a sub liquid chamber which are sealed with an outer peripheral portion and in which an incompressible liquid is sealed and communicated through an orifice passage. A substantially cylindrical rubber elastic body having: an outer cylindrical member disposed coaxially outside the rubber elastic member to close the recess in a liquid-tight manner; and the main shaft metal member and the outer tube provided on the main shaft metal member. A stopper member that regulates a relative displacement of a predetermined or more relative to the metal fitting, and a restraining member that is embedded in a side wall part that partitions the main liquid chamber on both axial sides of the rubber elastic body and regulates swelling deformation of the side wall part. Have.

In a liquid-filled type vibration damping device having such a structure, for example, a main shaft is connected to a support member on the vehicle body side, and an outer cylinder is connected to a support member on the engine side. The main liquid chamber is disposed above. In this state, when vibration in the direction perpendicular to the axis acts between the main shaft fitting and the outer cylinder fitting, the elastic action of the rubber elastic body and the incompressible fluid flowing between the main liquid chamber and the sub liquid chamber via the orifice passage. The vibration is effectively attenuated by the liquid column resonance action of the liquid.

[0004] In this case, in order to enhance the vibration damping effect based on the liquid column resonance action of the incompressible liquid flowing through the orifice passage, it is preferable to flow as much incompressible liquid as possible. For this reason, in the liquid filled type vibration damping device, it is possible to prevent the side walls defining the main liquid chamber on both sides in the axial direction of the rubber elastic body from expanding and deforming outward, thereby preventing the drainage efficiency from the main liquid chamber from being reduced. As a result, a restraining member is provided on the side wall.

When excessive vibration acts between the main shaft and the outer tube, the stopper member restricts the relative displacement between the main shaft and the outer tube by a predetermined amount or more. Deformation is prevented, thereby improving the durability of the rubber elastic body.

[0006]

By the way, the liquid-filled type vibration damping device, which has been improved in quality as described above, such as advanced vibration damping performance and improved durability, tends to have a complicated structure.
The number of parts also tends to increase. In the case of the liquid-filled type vibration damping device, since the restraining member, the stopper member, and the like are composed of a plurality of independent parts, there is a problem that the manufacturing process is complicated and the cost is likely to increase.

The present invention has been devised in view of the above problems, and secures a structure excellent in vibration isolation performance, durability, etc., reduces the number of parts, and improves liquid encapsulation. It is an object of the present invention to provide a vibration isolator.

[0008]

According to a first aspect of the present invention, there is provided a main shaft, a main shaft fixed to the main shaft, a liquid sealed in an outer peripheral portion thereof, and communicated with each other through an orifice passage. A substantially cylindrical rubber elastic body having a concave portion forming a liquid chamber and a sub liquid chamber, an outer cylindrical metal member coaxially arranged outside the rubber elastic member to close the concave portion in a liquid-tight manner, and the main shaft metal member A stopper member provided for restricting a relative displacement of the spindle metal fitting and the outer cylindrical metal fitting which is equal to or greater than a predetermined value,
A restraining member buried in a side wall portion defining the main liquid chamber on both sides in the axial direction of the rubber elastic body, and restricting swelling deformation of the side wall portion, wherein the stopper member and the restraining member include It employs a means that is integrally formed with a connecting portion that is embedded in the body and connects the two.

The invention according to claim 2 is the invention according to claim 1.
In the invention described above, a means is employed in which the stopper member, the restraining member, and the connecting portion are integrally formed of resin or metal.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view taken along a direction perpendicular to the axis of the liquid-filled type vibration damping device according to the present embodiment.
2 is a cross-sectional view of the liquid-filled type vibration damping device taken along a line II-II in FIG. 4, and FIG. 3 is a liquid-filled type vibration damping device. FIG. 3 is a cross-sectional view along the axial direction of the vibration device, and is a cross-sectional view taken along line III-III of FIG. 4;
FIG. 4 is a front view of the liquid filled type vibration damping device as viewed from the axial direction.

The liquid-filled type vibration damping device of the present embodiment connects a spindle metal fitting 1, an intermediate metal fitting 2 which is disposed outside the main spindle metal fitting 1 at a distance, and connects the main spindle metal fitting 1 and the intermediate metal fitting 2 to each other. A rubber elastic body 3 having a concave portion forming a main liquid chamber 33 and a sub liquid chamber 34 communicating with each other via an orifice passage 35 at an outer peripheral portion thereof, and an outer cylindrical metal fitting coaxially arranged outside the rubber elastic body 3. 4, a stopper member 5 fixed to the spindle fitting 1,
The stopper 7 is formed integrally with the stopper 7 together with the connecting portion 7 embedded in the rubber elastic body 3 as main components.

The spindle fitting 1 is formed in a pipe shape from metal. The intermediate metal fitting 2 includes a pair of ring portions 21 coaxially spaced apart from each other in the axial direction, and two bridge portions 22 bridged between the ring portions 21. Two window sections partitioned with a pair of ring sections 21 are formed. The rubber elastic body 3 is interposed between the spindle fitting 1 and the intermediate fitting 2 by integral vulcanization molding, and integrally connects the two. The rubber elastic body 3 is formed in a substantially cylindrical shape, and has a pair of side wall portions 31 located at both ends.
And the two side wall portions 31 are axially extended between the two side wall portions 31.
And a pair of arm-shaped partition portions 32 that divide the space into two. Accordingly, concave portions forming the main liquid chamber 33 and the sub liquid chamber 34 are provided on both sides in the radial direction with the main spindle 1 interposed therebetween and corresponding to the windows of the intermediate metal fitting 2. The main liquid chamber 33 and the sub liquid chamber 34 communicate with each other through an orifice passage 35 formed on the outer peripheral portion of the rubber elastic body 3.
An incompressible liquid L is sealed therein. In addition, as the incompressible liquid L, for example, water, glycol, or the like can be used.

A hollow portion 36 penetrating along the axial direction is formed in a portion of the rubber elastic body 3 between the main shaft fitting 1 and the sub-liquid chamber 34, and the hollow portion 36 and the sub-liquid chamber are formed. A part of the rubber elastic body 3 is made thinner between the auxiliary liquid chamber 34 and the auxiliary liquid chamber 34.
The diaphragm 37 which constitutes the partition wall is formed.
The outer tube fitting 4 is formed of metal in a cylindrical shape, and is attached by being inserted outside the rubber elastic body 3 to reduce the diameter. Thereby, the main liquid chamber 3 of the rubber elastic body 3
3. The auxiliary liquid chamber 34 and the orifice passage 35 are liquid-tightly closed.

The stopper member 5 includes a cylindrical portion 51 fixed to the outer peripheral surface of the spindle metal fitting 1, a first stopper portion 52 projecting from the cylindrical portion 51 toward the center of the main liquid chamber 33, and a cylindrical member. The second stopper portion 53 protrudes from the portion 51 toward the sub liquid chamber 34, and is integrally formed of resin. The stopper member 5 is buried in the rubber elastic body 3, and the protruding portions of the first and second stopper portions 52 and 53 are covered by the rubber cushion layer of the rubber elastic body 3. The stopper member 5 regulates a relative displacement of the main shaft 1 and the outer tube 4 in a direction perpendicular to the axis that is equal to or greater than a predetermined value.

The restraining member 6 is formed of a pair of members formed in a circular arc shape from a resin. The restraining member 6 is formed on the side walls 31 on both sides in the axial direction of the rubber elastic body 3 so as to cross the substantially central portion of the main liquid chamber 33 in the circumferential direction. Each is buried. Both ends of the restraining member 6 are connected to a pair of connecting portions 7 extending radially from the cylindrical portion 51 of the stopper member 5 and embedded in each arm-shaped partition 32 of the rubber elastic body 3. The restraining member 6, the stopper member 5, and the connecting portion 7 connecting the both are integrally formed by resin molding.

The liquid filled type vibration damping device of this embodiment is manufactured as follows. First, the spindle fitting 1 has a predetermined shape.
And a stopper member 5 is provided on the outer peripheral surface of the spindle fitting 1.
Is knurled to secure the fixation. Next, the main spindle 1 is arranged at a predetermined position in a molding die in which the stopper member 5, the restraining member 6 and the connecting portion 7 are integrally formed, and resin molding is performed. Thereby, as shown in FIGS. 5 to 9, a resin molded body in which the stopper member 5, the restraining member 6, and the connecting portion 7 are integrated is formed. This resin molded body is formed in a state where the stopper member 5 is fixed to the outer periphery of the spindle metal fitting 1.

Next, at a predetermined position in a mold for vulcanizing and molding the rubber elastic body 3, an integrated body composed of the spindle metal fitting 1 and the resin molded body, and an intermediate metal fitting 2 formed in a predetermined shape are arranged. Perform rubber vulcanization molding. In this case, since the spindle bracket 1, the stopper member 5, the restraining member 6, and the connecting portion 7 are integrally formed, the number of components arranged in the molding die is small, and the positioning of each component becomes easy. As a result, the rubber elastic body 3 having a predetermined shape having concave portions forming the main liquid chamber 33 and the sub liquid chamber 34 is formed by interposing the main metal fitting 1 and the intermediate metal fitting 2 and integrally connecting the two. You.

Next, while the rubber vulcanized molded product is immersed in a water tank filled with the liquid L to be sealed in the main liquid chamber 33 and the sub liquid chamber 34, the rubber vulcanized molded body is formed outside the rubber elastic body 3 into a predetermined shape. The formed outer cylinder fitting 4 is inserted, and the outer cylinder fitting 4 is subjected to drawing processing. As a result, the liquid L is sealed in the main liquid chamber 33 and the sub liquid chamber 34, and the liquid-sealed vibration isolator of the present embodiment is completed.

In the liquid-filled type vibration damping device of the present embodiment configured as described above, for example, the main shaft 1 is connected to the support member on the vehicle body side, and the outer cylinder 4 is connected to the support member on the engine side. The main liquid chamber 33 is disposed above the main vibration input direction of the engine. When the liquid-filled type vibration damping device is provided in this manner, the intermediate metal fitting 2 and the outer cylindrical metal fitting 4 arranged eccentrically with respect to the main shaft metal fitting 1 are replaced with the engine mounted on the outer cylindrical metal fitting 4. Due to its own weight, the rubber elastic body 3 moves downward through the elastic deformation of the rubber elastic body 3, and is positioned substantially concentrically with the spindle metal fitting 1.

When vibration is applied between the main shaft 1 and the outer tube 4, the vibration flows between the main liquid chamber 33 and the sub liquid chamber 34 through the elastic action of the rubber elastic body 3 and the orifice passage 35. The vibration of the incompressible liquid L is effectively damped by the liquid column resonance action. At this time, when the non-compressible liquid L in the main liquid chamber 33 is pressurized by vibrating in a direction in which the main shaft 1 approaches the main liquid chamber 33, the main liquid chamber 33 of the rubber elastic body 3 is pressed.
The side wall portions 31 located on both sides in the axial direction are reliably prevented from bulging and deforming outward by the restraining members 6 embedded therein. Thereby, a large amount of the incompressible liquid L in the main liquid chamber 33 flows efficiently to the orifice passage 35, and the vibration damping effect is more effectively exhibited.

When excessive vibration acts between the main shaft 1 and the outer tube 4 in the vertical direction, the stopper member 5 restricts the relative displacement between the main shaft 1 and the outer tube 4 beyond a predetermined value. In addition, excessive deformation of the rubber elastic body 3 is prevented. Thereby, the durability of the rubber elastic body 3 is improved. As described above, the liquid-filled type vibration damping device of the present embodiment has the rubber elastic body 3
A restricting member 6 for restricting the bulging deformation of the side wall portion 31 and a stopper member 5 provided on the spindle metal fitting 1 for preventing the rubber elastic body 3 from being excessively deformed are formed by resin molding together with a connecting portion 7 for connecting them. Since they are integrally formed, it is possible to secure a structure excellent in vibration isolation performance and durability, and to reduce the number of components, thereby improving productivity.

The size, shape and the like of the stopper member 5, the restraining member 6, and the connecting portion 7 can be appropriately changed as needed. For example, the liquid filled type vibration damping device shown in FIGS. 10 and 11 has the first stopper portion 52 of the stopper member 5a.
The shape of a is different from that of the above embodiment. That is, the first stopper portion 52a is formed in an umbrella shape having a protruding portion 54a that protrudes outward at the protruding tip portion. As a result, a narrowed passage for the liquid L flowing in the main liquid chamber 33a is formed between the overhang portion 54a, the side wall portion 31a of the rubber elastic body 3a, and the arm-shaped partition wall portion 32a, and the vibration based on the liquid column resonance action. The damping effect is enhanced.

In the above embodiment, since the stopper member 5, the restraining member 6, and the connecting portion 7 are integrally formed of resin, it is advantageous in reducing the weight, but more sufficient strength is required. In such a case, for example, a metal such as aluminum may be formed integrally by die casting. In this case, the number of parts can be further reduced by integrally forming the spindle metal fitting 1 in addition to the stopper member 5, the restraining member 6, and the connecting portion 7.

The liquid filled type vibration damping device of the above embodiment is of a type in which the main liquid chamber 33 and the sub liquid chamber 34 are provided on both sides with the main spindle 1 interposed therebetween. ,
The present invention can also be applied to a liquid-filled type vibration damping device in which a main liquid chamber and a sub liquid chamber are provided on one side.

[0025]

According to the liquid filled type vibration damping device of the present invention,
Since the stopper member and the restraining member are embedded in the rubber elastic body and integrally formed with the connecting portion for connecting the both, a structure excellent in vibration isolation performance and durability can be secured, and the number of parts is reduced. As a result, productivity can be improved.

In the case where the stopper member, the restraining member and the connecting portion are integrally formed of metal, the number of parts can be further reduced by integrally forming the spindle bracket in addition to these. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along a direction perpendicular to an axis of a liquid-filled type vibration damping device according to an embodiment of the present invention, and is a cross-sectional view taken along line II of FIG.

FIG. 2 is a cross-sectional view along the axial direction of the liquid-filled type vibration damping device according to the embodiment of the present invention, and is a cross-sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view along the axial direction of the liquid-filled type vibration damping device according to the embodiment of the present invention, and is a cross-sectional view taken along line III-III of FIG.

FIG. 4 is a front view of the liquid-filled type vibration damping device according to the embodiment of the present invention as viewed from the axial direction.

FIG. 5 is a front view of a main member made of a resin molded body according to the embodiment of the present invention.

FIG. 6 is a side view of a main member made of a resin molded body according to the embodiment of the present invention.

FIG. 7 is a plan view of a main member made of a resin molded body according to the embodiment of the present invention.

8 is a cross-sectional view of a main member made of a resin molded body according to an embodiment of the present invention, taken along the axial direction, and is a sectional view taken along line VIII-VIII of FIG.
FIG.

FIG. 9 is a cross-sectional view of a main member made of a resin molded body according to the embodiment of the present invention, taken along the axial direction, and is a cross-sectional view taken along line IX-IX of FIG.

FIG. 10 is a sectional view taken along a direction perpendicular to an axis of a liquid filled type vibration damping device according to another embodiment of the present invention, and is a sectional view taken along line XX of FIG. 11;
FIG.

FIG. 11 is a sectional view along an axial direction of a liquid filled type vibration damping device according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spindle metal fitting 2 ... Intermediate metal fitting 3, 3a ... Rubber elastic body 4 ... Outer cylinder metal fitting 5 ... Stopper member 6 ... Restriction member
7 Connecting part 21 Ring part 22 Bridge part 31, 31a Side wall part 32, 32a Arm-shaped partition part 33, 33a Main liquid chamber
34 ... Sub-liquid chamber 35 ... Orifice passage 36 ... Cavity part 51 ... Cylinder part 52,52a ... First stopper part 53 ... Second stopper part 54a ... Extended part

Claims (2)

[Claims] 1. A substantially cylindrical rubber having a main shaft fitting, a concave portion fixed to the main shaft fitting, and having a liquid sealed in an outer peripheral portion thereof and forming a main liquid chamber and a sub liquid chamber communicating with each other through an orifice passage. An elastic member, an outer cylindrical member disposed coaxially outside the rubber elastic member and closing the concave portion in a liquid-tight manner, a predetermined relative or more relative to the main shaft member and the outer cylindrical member provided on the main shaft metal member. A stopper member that regulates displacement, and a restraining member that is embedded in a side wall that divides the main liquid chamber on both sides in the axial direction of the rubber elastic body and regulates swelling deformation of the side wall. The liquid sealing type vibration damping device, wherein the restraining member is formed integrally with a connecting portion embedded in the rubber elastic body and connecting the both. 2. The liquid-filled type vibration damping device according to claim 1, wherein the stopper member, the restraining member, and the connecting portion are integrally formed of resin or metal.