JP3289471B2 - Liquid-filled cylindrical mount - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled cylindrical mount, and more particularly, to a vibration input in a direction perpendicular to an axis.
The present invention relates to a liquid-filled cylindrical mount capable of exhibiting a good vibration-proof function.

[0002]

2. Description of the Related Art Conventionally, as one of liquid-filled type vibration damping rubbers used for engine mounts of automobiles and the like, an inner cylinder and an outer cylinder which are arranged at a predetermined distance from each other in a direction perpendicular to an axis are rubber elastic. A pressure receiving chamber in which a part of the wall is formed of a rubber elastic body and an internal pressure is generated when vibration is input, and a part of the wall is a flexible film The pressure chamber and the equilibrium chamber are filled with a predetermined liquid, and an orifice passage communicating the pressure chamber and the equilibrium chamber with each other is formed. Is known.

In such a liquid-filled cylindrical mount, when a vibration is input in a direction perpendicular to the axis, in addition to a vibration-proof effect against a specific low-frequency vibration based on a liquid column resonance effect of a liquid flowing through an orifice passage, In order to obtain an effective anti-vibration effect against high-frequency vibration, a protruding member is provided in the pressure receiving chamber, which protrudes from the inner cylinder fitting side to the outer cylinder fitting side, and the tip end portion extends laterally. There is known a structure in which a stopper member is provided to utilize a liquid column resonance effect flowing through a constricted portion formed between a side portion of the stopper member and a pressure receiving chamber inner wall. The cylindrical mount is disclosed in Japanese Patent Publication No. 5-55739.

[0004]

Incidentally, in the liquid-filled cylindrical mount as disclosed in the above-mentioned publication, a stopper member for forming a constricted portion with the inner wall of the pressure receiving chamber is provided on the outer cylinder fitting side. The reinforcing metal fitting is bent in a protruding state, and the cushioning rubber having a predetermined thickness integrally vulcanized on the radially outer surface thereof has a substantially arc-shaped cross section as a whole.

[0005] In the stopper member having a substantially arcuate cross-sectional shape as a whole as described above, the stopper member has a streamline shape which is outwardly convex in the main vibration input direction perpendicular to the axis. Since the side is concave, the resistance from the liquid when moving through the liquid in the pressure receiving chamber acts as a large one, thereby increasing the vibration transmission force regardless of the frequency range. There was a problem that the anti-vibration function was deteriorated.

The stopper member is formed separately from the projecting member and is assembled to the projecting member from the viewpoint of manufacturability of the mount, but has an assembly direction in the main vibration input direction. Because it is a shape,
There is a risk of supplying a defective stopper function due to incorrect assembly.

The present invention has been made in view of the above problems relating to the vibration-proof function and the assemblability of the stopper member incorporated in the liquid-filled cylindrical mount as described above. The purpose is to provide.

[0008]

Means for Solving the Problems In order to solve this problem, the present invention is characterized in that an inner cylinder and an outer cylinder which are arranged at a predetermined distance from each other in the direction perpendicular to the axis are made of rubber. A pressure receiving chamber between the inner cylinder and the outer cylinder, a part of the wall is formed of the rubber elastic body, and an internal pressure fluctuation is caused at the time of vibration input; The pressure receiving chamber and the equilibrium chamber are filled with a predetermined liquid, and the pressure receiving chamber and the equilibrium chamber communicate with each other. In the liquid-filled cylindrical mount provided with an orifice passage, a protruding member that protrudes from the inner cylinder fitting side toward the outer cylinder fitting side is provided in the pressure receiving chamber, and a protruding member is provided at a tip end of the protruding member. And a predetermined constriction is formed between the pressure receiving chamber and the inner wall of the pressure receiving chamber. The stopper member for forming is provided, the stopper member, wherein a flat reinforcing bracket which is fixed to the projecting member, the mounting shaft perpendicular direction from the outer peripheral edge portion of the reinforcing bracket is a gradually thicker toward the center reinforcing Front and back of bracket
And the cushioning rubber is formed symmetrically with the reinforcing bracket interposed therebetween.

[0009]

According to the liquid-filled cylindrical mount having such a structure, in the main vibration input direction perpendicular to the axis, the stopper member has a streamline shape that is convex both inside and outside. Thus, the resistance of the liquid to the inward and outward movement in the pressure receiving chamber is reduced. Thereby, the vibration transmission force due to the movement resistance in the liquid can be suppressed low irrespective of the input vibration frequency, and the vibration isolation function can be enhanced.

In addition, since the cushioning rubber is formed symmetrically with respect to the flat reinforcing metal, there is no longer any distinction between the front and back sides, and erroneous assembly of the stopper member can be reliably prevented. It is possible to improve the workability of assembling itself and to stably provide a mount having a predetermined stopper function.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 show an FF type vehicle engine mount 10 according to an embodiment of the present invention. The engine mount 10 has an inner cylinder fitting 12 and an outer cylinder fitting 1 arranged at a predetermined distance in the radial direction.
4 has a structure elastically connected by a rubber elastic body 16 interposed therebetween. The engine mount 10 is mounted between the power unit and the vehicle body by mounting the inner cylinder fitting 12 on one of the power unit and the vehicle body and the outer cylinder fitting 14 on the other side of the power unit. Is to be interposed.

Although not explicitly shown in the drawings, when the engine mount 10 is mounted, the weight of the power unit is exerted between the inner cylinder fitting 12 and the outer cylinder fitting 14, so that the inner and outer cylinder fittings 12, 14 are attached. They are located on substantially the same axis. In such a mounted state, vibration to be damped is input to the engine mount 10 in a direction perpendicular to the axis, and in particular, main vibration to be damped is input in the vertical direction in FIG.

More specifically, the inner cylinder fitting 12 has a cylindrical shape. A metal sleeve 18 having a large diameter and a substantially cylindrical shape as a whole is eccentrically disposed radially outward of the inner cylindrical fitting 12 by a predetermined amount in the radial direction.
The rubber elastic body 1 having a substantially thick cylindrical shape as a whole is provided between the inner cylinder fitting 12 and the metal sleeve 18.
6 are interposed. That is, the rubber elastic body 16 has the inner cylindrical fitting 12 on the inner peripheral surface, the metal sleeve 18 on the outer peripheral surface,
Each is formed as an integrally vulcanized molded product fixed thereto.

The metal sleeves 18 are shown in FIGS.
As shown in FIG.
And a small-diameter portion 24 at the center in the axial direction. Further, a first opening window 26 is formed in the central portion in the axial direction of the metal sleeve 18 on the side (the upper side in FIG. 1) where the radial separation distance from the inner cylindrical fitting 12 is large. / 4 circumference. In addition, the side where the radial separation distance from the inner cylinder fitting 12 is small (the lower side in FIG. 1).
The second opening window 28 having the same size as the first opening window 26
Are formed. In the center of the second opening window 28 in the circumferential direction, a protruding fitting 29 projecting toward the inner cylindrical fitting 12 and provided in a bridge shape in the axial direction is welded and fixed to the inner peripheral surface of the small diameter portion 24. ing.

Further, the rubber elastic body 16 is provided with the inner cylindrical fitting 1.
To the side where the radial separation distance between the metal sleeve 18 and the metal sleeve 18 is large,
A first pocket portion 30 is formed and is opened through the first opening window 26 of the metal sleeve 18.
A second pocket portion 32 is formed on the side where the radial separation distance between the inner cylindrical fitting 12 and the metal sleeve 18 is small so as to straddle the protruding fitting 29 in the circumferential direction.
It is opened through the second opening window 28 of the valve 18.

The rubber elastic body 16 is provided with the inner cylindrical fitting 12.
On the side where the radial separation distance between the metal sleeve 18 and the metal sleeve 18 is small, there is provided a slit 34 penetrating in the axial direction between the inner cylinder fitting 12 and the second pocket portion 32. Then, the bottom wall and the axial side wall of the second pocket portion 32 are thinned by the slits 34 except for the protruding metal fittings 29, thereby forming a flexible film that is easily elastically deformed. I have.

On the outer peripheral surface of the small diameter portion 24 of the metal sleeve 18, a seal rubber layer 36 having a substantially cylindrical outer peripheral surface shape is vulcanized and formed integrally with the rubber elastic body 16 and disposed. In addition, a portion of the seal rubber layer 36 is removed from the outer peripheral surface of the small-diameter portion 24 to connect the first pocket portion 30 and the second pocket portion 32 with each other.
8, 38 are formed.

Further, the outer cylinder fitting 14 is externally inserted into the integrally vulcanized molded product including the seal rubber layer 36, and is fitted and fixed to the large diameter portion 22 of the metal sleeve 18 and the outer peripheral surface of the seal rubber layer 36. ing. Then, the first and second pocket portions 30 and 32 and the pair of orifice grooves 38 and 38 are covered with the outer tube fitting 14, respectively. Further, the first and second pocket portions 30, 32 and the orifice grooves 38, 3
8 is filled with a liquid such as water, alkylene glycol, polyalkylene glycol, silicone oil or the like.

As a result, the first pocket portion 30 is defined as a pressure receiving chamber 40, and the second pocket portion 32 is defined as an equilibrium chamber 42. A pair of orifice grooves 38, 38 connect the pressure receiving chamber 40 and the equilibrium chamber 42 to each other. Are formed as a pair of orifice passages 44, 44. The orifice passages 44 are tuned so that liquid column resonance acts on low-frequency vibration of 50 Hz or less.

In the pressure receiving chamber 40, a vibration absorbing mechanism 50 for absorbing high frequency vibration by generating liquid column resonance when the orifice passages 44 are clogged at the time of high frequency vibration protrudes. Is provided. The vibration absorbing mechanism 50 has a protruding member 52 having a lower end welded and fixed on the outer peripheral surface in the axial direction of the inner cylindrical fitting 12 and protruding radially outward, and is caulked and fixed to the upper end thereof. The peripheral edge portion extends laterally around the protruding member 52 to form the annular constricted portion 56 between the inner wall of the pressure receiving chamber 40 and substantially perpendicular to the main vibration direction (vertical direction in FIGS. 1 and 2). And a stopper member 54 to be formed.

As shown in FIGS. 4 and 5, the stopper member 54 is formed by a reinforcing metal member 58 caulked and fixed to the protruding member 52 and a cushion rubber 60 integrally vulcanized and bonded to the outer peripheral surface thereof. In the center of the reinforcing bracket 58,
It is a rectangular flat plate having a long hole-shaped mounting hole 62 for regulating the direction of assembly to the protruding member 52. The cushioning rubber 60 is formed on the front and back surfaces of the reinforcing metal member 58 in an arc shape that protrudes outward over the entire longitudinal direction, and in the center, the protrusion member 52 provided along the mounting hole 62. Are formed symmetrically on the front and back sides of the reinforcing bracket 58. Then, the stopper member 54 is assembled so that the longitudinal direction thereof is aligned with the circumferential direction of the pressure receiving chamber 40, and as shown in FIGS. 1 and 2, the constricted portion 56 is formed by the side peripheral edge portion of the cushion rubber 60. I have.

In the engine mount 10 provided with the stopper member 54 having such a structure, any of the main input vibrations in the direction perpendicular to the axis has a convex streamline shape. Thereby, the resistance from the liquid acting on the inward and outward movement of the stopper member 54 in the pressure receiving chamber 40 can be suppressed to an extremely small value. Therefore, regardless of low-frequency and high-frequency vibrations, vibration due to the movement resistance in the liquid can be suppressed. It can be reduced or prevented from causing deterioration of transmission power,
The anti-vibration function can be efficiently enhanced.

Further, since the stopper member 54 is constituted by the cushion rubber 60 having a symmetrical shape on the front and back sides of the reinforcing metal member 58 of a rectangular flat plate, there is no distinction between the front and back sides, and erroneous assembly to the protruding member 52 is not performed. Since there is no fear, the workability of assembling the stopper member 54 can be improved, and a mount in which the stopper function of the stopper member 54 in the main vibration input direction is constant can be stably manufactured.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described specific examples.

For example, instead of welding and fixing the projecting member 52 to the inner tube fitting 12, the projecting member may be integrally formed with the inner tube fitting, or the projecting member may be press-fitted and fixed to the inner tube fitting. Is also good.

The stopper member may be fixed to the protruding member by screwing or riveting.

The shape of the cushioning rubber 60 is not limited to the arc shape, but may be any other shape as long as it is formed in a streamlined shape having a convex shape at the center of the reinforcing bracket.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an engine mount as one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a plan view of a stopper member included in the engine mount shown in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Engine mount 12 Inner cylinder fitting 14 Outer cylinder fitting 16 Rubber elastic body 40 Pressure receiving chamber 42 Equilibrium chamber 44 Orifice passage 52 Projecting member 54 Stopper member 56 Narrow part 58 Reinforcement fitting 60 Buffer rubber

Claims (1)

(57) [Claims] An inner cylinder and an outer cylinder, which are arranged at a predetermined distance from each other in a direction perpendicular to the axis, are connected by a rubber elastic body, and a wall portion is provided between the inner cylinder and the outer cylinder. A pressure receiving chamber partly composed of the rubber elastic body and causing internal pressure fluctuation at the time of vibration input, and an equilibrium chamber partly composed of a flexible film and having a variable volume are formed. A liquid-filled cylindrical mount including a predetermined liquid in the pressure receiving chamber and the equilibrium chamber, and an orifice passage communicating the pressure receiving chamber and the equilibrium chamber with each other. A stopper member provided with a protruding member protruding from the metal fitting side toward the outer cylinder metal fitting, and extending laterally at a tip end of the protruding member to form a predetermined constricted portion with the inner wall of the pressure receiving chamber. And the stopper member is formed as a flat plate fixed to the projecting member. And a reinforcing bracket, gradual sides of the thick-walled with reinforcing metal fitting from the outer peripheral edge portion of the reinforcing bracket toward the center in the mounting direction perpendicular to the axis
And a buffer rubber formed symmetrically with the reinforcing bracket interposed therebetween.