JP2002310220A - Liquid sealed type mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the distortion of an elastic body 3 caused by the input vibration and prevent deterioration of the durability of the elastic body 3 caused by penetration of muddy water etc., or radiation heat of an engine. SOLUTION: A radial direction buffer body 6 is mounted in either a first attaching member 1 or a second attaching member 2 opposite to the other member in such a way that the buffer body can be brought into contact with the other member in the radial direction. The buffer body 6 prevents the excessive eccentric motion of the first attaching member 1 and the second attaching member 2. An axial direction buffer body 62, which can be brought into contact with the first attaching member 1 and the second attaching member 2, is integrally formed with the radial direction buffer body 6. The buffer body 62 prevents the excessive relative displacement of the first attaching member 1 and the second attaching member 2 in the axial direction. In addition, a mantle part 61 is integrally formed with the radial direction buffer body 6 to prevent penetration of dust, rain, muddy water, etc., into the elastic body 3 or to shut off radiation heat of the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration technique, and more particularly to a liquid-filled mount used as an anti-vibration support for an automobile engine.

[0002]

2. Description of the Related Art A liquid-filled mount that elastically supports an engine on a vehicle body frame has a vibration-proof effect not only against vertical input vibration but also horizontal input vibration. There is a typical prior art,
For example, it is disclosed in Japanese Patent Publication No. 63-61533.

[0003]

However, according to the above-mentioned liquid-filled mount of the prior art, when the amplitude of the inputted vibration is large, the elastic body made of the elastomer is subjected to an excessive strain. May be impaired. In addition, when the elastic body receives dust, rainwater, muddy water, etc., or receives radiant heat from the engine,
Deterioration or durability may be impaired.

[0004] The present invention has been made in view of the above-mentioned problems, and a technical problem thereof is to limit distortion of an elastic body due to input vibration and prevent deterioration in durability.

Another technical problem is that dust, rainwater,
An object of the present invention is to prevent the elastic body from deteriorating due to intrusion of muddy water or radiant heat from an engine and deterioration in durability.

[0006]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the liquid-filled mount according to the first aspect of the present invention includes a first mounting member mounted on the vehicle body side, a second mounting member mounted on the engine side and arranged substantially concentrically with the first mounting member, An elastic body provided integrally between the first mounting member and the second mounting member, a diaphragm provided integrally with the first mounting member, and provided on an inner periphery of the first mounting member; An orifice member having a main orifice opened to partition between the first liquid chamber on the elastic body side and the second liquid chamber on the diaphragm side and communicate the two liquid chambers with each other;
A radial buffer provided on one of the first mounting member and the second mounting member and facing the other of the first mounting member and the second mounting member so as to be capable of contacting in the radial direction. It is.

According to a second aspect of the present invention, there is provided a liquid-filled mount according to the first aspect, wherein an axial buffer is integrally formed with the radial buffer, and the axial buffer is provided with the first mounting member and the first mounting member. It is opposed to the second mounting member so as to be able to contact in the axial direction.

According to a third aspect of the present invention, in the liquid-filled mount according to the first or second aspect, an outer jacket for surrounding the first mounting member and the elastic body from the engine side is formed integrally with the radial buffer. It was done.

[0009]

FIG. 1 is a cross-sectional view of a preferred embodiment of a liquid-filled mount according to the present invention, cut along a plane passing through an axis, FIG. 2 is a cross-sectional view in which a part of FIG. FIG.
Is the arrow II in FIG. 1 after removing the engine side bracket 24.
It is the figure seen from the I direction. First, in FIG. 1, reference numeral 1 denotes a metal first mounting member including an outer cylinder 11 and an upper flange member 12 fixed to the inner periphery of the upper end by caulking. It is attached to a vehicle body (not shown) via a vehicle body side bracket 13 provided.

Reference numeral 2 denotes a metal boss 21 disposed on the inner periphery of the upper portion of the first mounting member 1, a mounting bolt 22 projecting from the upper surface thereof, and a flange member externally inserted into the mounting bolt 22. A mounting bolt 22 is connected to the engine-side bracket 24 by a nut (not shown) screwed to the second mounting member.

An elastic body 3 formed of an elastomer is interposed between the boss 21 of the second mounting member 2 and the outer cylinder 11 of the first mounting member 1. This elastic body 3 has a boss 2
The outer periphery is vulcanized and bonded to the inner peripheral surface of the inner cylinder 34, while being vulcanized and bonded to the lower bulging portion 21a. The inner cylinder 34 is
While being pressed into the inner peripheral surface of the outer cylinder 11, the upper end
The upper flange member 12 is fixed by caulking to a caulking portion 11 a formed at the upper end of the first member 1. That is, the outer peripheral portion of the elastic body 3 is connected to the first mounting member 1 through the inner cylinder 34.
Is fixed to the inner circumference of the outer cylinder 11.

A diaphragm 4 made of an elastomer and an orifice member 5 arranged above the diaphragm 4 are fixed to the inner periphery of the lower part of the outer cylinder 11 of the first mounting member 1. Diaphragm 4 is formed sufficiently thinner than elastic body 3.

As shown in FIG. 2, the orifice member 5
Is to partition the sealed space between the elastic body 3 and the diaphragm 4 on the inner periphery of the first mounting member 1 into a first liquid chamber A on the elastic body 3 side and a second liquid chamber B on the diaphragm 4 side. The upper disk 51 is disposed between the annular step portion 11b formed on the outer cylinder 11 of the first mounting member 1 and the lower end portion of the inner cylinder 34, and is disposed below the outer disk 51. A lower disk 52 and a sub-diaphragm 53 sealed on the inner periphery thereof. The lower disk 52 is provided on the outer peripheral edge 4 of the diaphragm 4.
a, is press-fitted to the lower inner periphery of the outer cylinder 11 of the first mounting member 1, in other words, the outer peripheral edge 4 a of the diaphragm 4 is in contact with the lower disk 52 and the lower inner periphery of the outer cylinder 11. It is in a state sandwiched between.

A main orifice C is formed between the upper disk 51 and the lower disk 52 of the orifice member 5. The main orifice C is formed by a circumferentially-ended groove 52 a formed in the lower disk 52, and one end of the groove 52 a is formed through an opening 51 a formed in the upper disk 51. A, and the other end is the lower disk 5
2 is opened to the second liquid chamber B through the opening 52b. Therefore, the first liquid chamber A and the second liquid chamber B communicate with each other via the main orifice C.

A sub-diaphragm chamber D is formed between the upper disk 51 and the lower disk 52 of the orifice member 5 and located on the inner peripheral side of the main orifice C. The sub-diaphragm chamber D is opened to the first liquid chamber A and the second liquid chamber B through a plurality of openings 51b opened in the upper disk 51 and a plurality of openings 52c opened in the lower disk 52. .

The sub-diaphragm 53 is made of an elastomer and formed into a disk shape, and its outer peripheral edge is in close contact with the peripheral wall of the sub-diaphragm chamber D over the entire circumference. The sub-diaphragm 53 has a central portion 53a and an outer peripheral portion 53b sandwiched between an upper disk 51 and a lower disk 52.
It can be bent in the thickness direction.

As shown in FIG. 1, the elastic body 3 has a conical main elastic part 31 which becomes lower from the lower bulging part 21a of the boss 21 toward the lower part of the inner cylinder 34, and an outer (upper) side thereof. It comprises a disk-shaped auxiliary elastic part 32 and four partition parts 33 in the circumferential direction formed between the main elastic part 31 and the auxiliary elastic part 32 so as to extend in the radial direction. Since the main elastic portion 31 is a main body that elastically supports the load on the engine side, which is a supported body, its thickness is larger than that of the sub-elastic portion 32. Has the required bearing capacity. Also, the lower swelling portion 21 of the boss 21
“a” is formed so that the load of the engine is transmitted to the main elastic portion 31 well.

Between the main elastic part 31 and the sub-elastic part 32 of the elastic body 3, there are defined four sub-liquid chambers E in the circumferential direction which are partitioned by a partition wall part 33. On the other hand, between the lower end of the inner cylinder 34, the annular step 11b of the outer cylinder 11, and the outer peripheral portion of the upper disk 51 of the orifice member 5, a sub-orifice F continuous in the circumferential direction is formed. The sub-orifice F is open to each sub-liquid chamber E via the outer peripheral end (lower end) of the main elastic portion 31 and the notch 3 a formed at the lower end of the inner cylinder 34. Therefore, the sub liquid chambers E communicate with each other through the sub orifice F.

A sealed space comprising a first liquid chamber A, a second liquid chamber B and a main orifice C and a sub-diaphragm chamber D communicating therewith, and a sealed space comprising each sub-liquid chamber E and a sub-orifice F communicating the same. Is filled with a liquid having an appropriate viscosity, such as silicone oil. In addition, a part of this liquid is sealed by assembling the mount in the liquid.

The main orifice C is extended in the circumferential direction, so that the liquid column resonance frequency of the sealed liquid existing inside the main orifice C is increased in the axial direction (up and down) due to a shock input such as a bouncing of the vehicle body. The direction is set to substantially coincide with the frequency of displacement. When the sealed liquid flows through the narrow or long flow path formed by the main orifice C at a high speed, an effective damping force is generated by the flow resistance.

The sub-orifice F is set so that the liquid column resonance frequency of the sealed liquid present therein substantially matches the radial vibration frequency of the first mounting member 1 due to, for example, engine shake. And an effective damping force due to the flow resistance of the sealed liquid. Each sub-orifice F
Can have the same size (length and cross-sectional area) or different sizes,
A different liquid column resonance frequency may be set.

The sub-diaphragm 53 of the orifice member 5 has an intermediate portion 53a in the radial direction.
By the pressure change of the first liquid chamber A introduced into the sub-diaphragm chamber D through the plurality of openings 51b, the first liquid chamber A can be easily bent in the thickness direction. The upper disk 51 and the lower disk 52 forming the sub-diaphragm chamber D are regulated by opposing surfaces. The liquid column resonance frequency acting to deform the sub-diaphragm 53 in the thickness direction is set, for example, to a frequency range of engine vibration of the engine.

As shown in FIG. 1, a radial buffer 6 is fitted to a column 21b formed above the boss 21 of the second mounting member 2. This radial buffer 6
Has an outer jacket 61 and an axial buffer 62 integrally, and is entirely vulcanized by an elastomer.

The radial buffer 6 has an appropriately thick cylindrical shape, and its lower end surface is formed by a lower bulging portion 21 of a boss 21.
a and the columnar portion 21 b, and the upper end surface is in contact with the flange member 23 inserted through the mounting bolt 22. In addition, the outer peripheral surface of the radial buffer 6 faces the first cylindrical stopper portion 12a formed on the inner peripheral edge of the upper flange member 12 of the first mounting member 1 in the radial direction via a predetermined gap δ1. are doing.

The outer cover 61 extends from the outer periphery of the upper part of the radial buffer body 6 and surrounds the upper part of the outer cylinder 11 and the upper flange member 12 and the elastic body 3 of the first mounting member 1 from above (the engine side). It is formed in the shape of a bowl.
The outer peripheral wall portion 61a of the outer cover 61 radially opposes the caulking portion 11a of the outer cylinder 11 formed in a bent shape convex toward the outer peripheral side via a narrow gap δ4.

The axial buffer 62 is formed by thickening a part of the top plate 61b of the outer cover 61 in the axial direction, and extends in an arc shape as shown in FIG. The axial buffer 62 is connected to the upper flange member 1 of the first mounting member 1.
2 a second stopper portion 12 formed in a convex shape upward
b and the engine side bracket 24 to which the mounting bolt 22 of the second mounting member 2 is coupled, and the second stopper portion 12b and the engine side bracket 24
, Are axially opposed via predetermined gaps δ2 and δ3.

A gap δ2 between the second stopper portion 12b of the upper flange member 12 of the first mounting member 1 and the axial buffer 62, the engine side bracket 24 and the axial buffer 6
The sum (δ2 + δ3) of the gap δ3 and the gap δ2 is set appropriately smaller than the axially opposed distance L between the lower end surface of the boss 21 and the upper disk 51 of the orifice member 5.

In the liquid-filled mount configured as described above, the vehicle body-side bracket 13 of the first mounting member 1 is fastened to the vehicle body via a bolt (not shown) inserted into the mounting hole 13a. In addition, the mounting bolt 22 of the second mounting member 2 is inserted into and connected to the engine-side bracket 24 to elastically support the engine on the vehicle body. When vibration in the axial direction (vertical direction) is input between the vehicle body side and the engine side, the first mounting member 1 and the second mounting member 2 are repeatedly displaced relative to each other in the axial direction. The elastic body 3 undergoes repeated deformation between the two.

When the input vibration in the axial direction is a continuous small-amplitude vibration due to, for example, engine vibration of the engine, the sealed liquid in the main orifice C has a large liquid column inertia and hardly flows. The main elastic part 3 of the elastic body 3 by vibration
The change in the liquid pressure of the first liquid chamber A due to the repeated deformation of 1 acts on the sub-diaphragm 53 in the sub-diaphragm chamber D via a plurality of openings 51b formed in the upper disk 51 of the orifice member 5. , This sub-diaphragm 53
The liquid in the first liquid chamber A undergoes liquid column resonance while being deformed in the thickness direction, thereby being effectively absorbed. Therefore, the dynamic spring constant is reduced, and the vibration transmission is effectively insulated.

When the input vibration in the axial direction is a shock input with a large amplitude in a low frequency range that causes a large change in the hydraulic pressure in the first liquid chamber A, the filled liquid flows through the main orifice C. The first liquid chamber A and the second liquid chamber B are repeatedly moved toward a relatively low pressure side by liquid column resonance. Therefore, high damping due to the flow resistance at this time is generated, and good damping is obtained, and the vibration is stopped in a short time.

In the above-described shock input or the like, δ2 is set so that the upper flange member 12 of the first mounting member 1 and the engine side bracket 24 of the second mounting member 2 are close to each other.
When a relative displacement in the axial direction by a displacement amount corresponding to + δ3 is obtained,
At that point, the axial buffer 62 is
Second stopper portion 12b and engine side bracket 24
Compressed by contact. For this reason, excessive displacement of the first mounting member 1 and the second mounting member 2 in the axial direction and excessive deformation of the elastic body 3 due to this are suppressed. Also, the axial buffer 62
Is made of an elastomer, there is no noise due to the contact between the second stopper portion 12b and the engine side bracket 24, and the elasticity of the elastomer has a good cushioning property.

The sum δ2 + δ3 of the gap between the axial buffer 62 and the second stopper portion 12b of the upper flange member 12 and the engine side bracket 24 is determined by the distance between the lower end surface of the boss 21 and the upper disk 51 of the orifice member 5. Direction distance L
Is somewhat smaller than that of the first mounting member 1 and the second mounting member 2 due to excessive axial displacement.
The boss 21 does not interfere with the upper disk 51 of the orifice member 5.

When a radial (substantially horizontal) vibration is input between the vehicle body side and the engine side, the relative displacement between the first mounting member 1 and the second mounting member 2 is made eccentric to each other. You. For this reason, the sub-liquid chambers E, E opposed to each other in the direction of the vibration displacement via the boss 21 in the elastic body 3 are alternately subjected to pressurization and decompression. In the case of vibration of small amplitude, the change in hydraulic pressure in the sub liquid chamber E is absorbed by the deformation of the thin sub elastic portion 32 in the elastic body 3, so that the vibration transmission is effectively insulated.

When the input vibration in the radial direction is within a predetermined frequency range due to an engine shake or the like, the sub-orifice F is moved toward the relatively low pressure side of the sub-liquid chambers E, E. Since the flow of the filled liquid occurs due to the liquid column resonance,
An effective damping force can be obtained by the flow resistance accompanying this.

Then, when the first mounting member 1 and the second mounting member 2 are relatively eccentric by a displacement amount corresponding to δ1 by the radial input vibration, at that time, the recovery surface of the radial buffer 6 made of an elastomer is obtained. Of the upper flange member 12
Is in contact with the inner peripheral surface of the first stopper portion 12a and is compressed between the first stopper portion 12a and the columnar portion 21b of the boss 21. For this reason, excessive eccentricity of the first mounting member 1 and the second mounting member 2 and excessive deformation of the elastic body 3 accompanying this are suppressed. Further, since the radial buffer 6 is made of an elastomer, no noise is generated due to contact with the first stopper portion 12a, and the elastic buffer of the elastomer has a good cushioning property.

Although high-pitched radiant heat is radiated from the engine located above in FIG.
The upper part and the elastic body 3 are surrounded from above by a cover-like outer cover 61, so that the radiant heat is
And is not incident on the first mounting member 1 and the elastic body 3. For this reason, deterioration of the elastic body 3 and decrease in durability due to heat are effectively prevented.

A gap δ1 between the radial buffer 6 and the upper flange member 12 of the first mounting member 1 is covered by a jacket 61, and the outer wall 61a of the jacket 61 and the outer cylinder 1
Since the gap δ4 between the first caulking portion 11a and the first caulking portion 11a is narrow, even if rainwater, muddy water and the like splashed from the road surface fly around the mount, or sand particles fly, etc. Can effectively be prevented from entering the elastic body 3 and deteriorating the elastic body 3.

Since the radial buffer 6, the outer shell 61 and the axial buffer 62 are formed into a continuous vulcanized product by the elastomer, an increase in the number of parts can be suppressed.

In this embodiment, the radial buffer 6
Is externally inserted into the boss 21 of the second mounting member 2.
May be vulcanized and adhered to the inner peripheral portion of the boss 21 so as to be able to come into contact with the columnar portion 21b of the boss 21.

[0040]

According to the liquid-filled mount according to the first aspect of the present invention, when the amplitude of the inputted radial vibration becomes a predetermined magnitude, the radial buffer is connected to the first mounting member or the second mounting member. By elastically contacting the member, excessive eccentric operation of the first mounting member and the second mounting member and excessive deformation of the elastic body due to this are suppressed, so that durability is reduced due to excessive distortion of the elastic body. Can be effectively prevented.

According to the liquid-filled mount according to the second aspect of the present invention, since the axial buffer is integrally formed with the radial buffer, the same effects as those of the first aspect can be obtained.
When the amplitude of the input vibration in the axial direction becomes a predetermined magnitude, the first mounting member and the second mounting member are elastically contacted by the axial buffer body to the first mounting member and the second mounting member. Excessive relative displacement of the member in the axial direction and associated excessive deformation of the elastic body are suppressed, so that it is possible to effectively prevent a decrease in durability due to excessive distortion of the elastic body.

According to the liquid-filled mount according to the second aspect of the present invention, since the radial shock absorber is formed integrally with the outer jacket surrounding the first mounting member and the elastic body from the engine side. In addition to the same effects as those of the first and second aspects, it is possible to prevent the deterioration of the elastic body and the decrease in durability due to intrusion of dust, rainwater, muddy water, or the like, or radiant heat from the engine.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a liquid-filled mount according to the present invention by cutting along a plane passing through an axis.

FIG. 2 is an enlarged sectional view of a part of FIG.

FIG. 3 is a view showing the engine side bracket 24 removed and viewed from the direction of arrow III in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 First mounting member 13 Body side bracket 2 Second mounting member 24 Engine side bracket 3 Elastic body 4 Diaphragm 5 Orifice member 6 Radial buffer 61 Outer jacket 62 Axial buffer A First liquid chamber B Second liquid chamber C Main orifice D Sub-diaphragm chamber E Sub-liquid chamber F Sub-orifice

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D035 CA05 3J047 AA03 CA06 CD01 CD07 FA02

Claims (3)

[Claims] A first mounting member (1) mounted on a vehicle body side; a second mounting member (2) mounted on an engine side and arranged substantially concentrically with the first mounting member (1); An elastic body (3) provided integrally between the first mounting member (1) and the second mounting member (2); and a diaphragm (4) provided integrally with the first mounting member (1). Between the first liquid chamber (A) on the elastic body (3) side and the second liquid chamber (B) on the diaphragm (4) side, which is provided on the inner periphery of the first mounting member (1). And an orifice member (5) in which a main orifice (C) communicating the two liquid chambers (A, B) with each other is opened, and the first mounting member (1) and the second mounting member (2). And radially in contact with the other of the first mounting member (1) and the second mounting member (2). Fluid-filled mount, characterized in that it comprises enabling opposed to radial cushioning body (6), the. 2. The axial buffer (6) is attached to the radial buffer (6).
2) The axial mounting member (62) is formed integrally, and the axial buffer (62) is opposed to the first mounting member (1) and the second mounting member (2) so as to be axially contactable. 2. The liquid-filled mount according to 1. 3. An outer jacket (61) surrounding the first mounting member (1) and the elastic body (3) from the engine side is formed integrally with the radial buffer body (6). Item 3. A liquid-filled mount according to item 1 or 2.