JP2009092174A - Liquid-sealed vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain generation of an abnormal sound as a caulking part is rubbed, when vibration in the longitudinal direction and the lateral direction is input to a liquid-sealed vibration control device. <P>SOLUTION: A support metal fitting 3 has an inner cylinder 32 and an outer cylinder 33. A flange 32b is formed outward in the radial direction over the whole periphery on the upper end of the inner cylinder 32. A flange 8a is formed outward in the radial direction over the whole periphery on the lower end of a stopper metal fitting 8. The flange 32b on the upper end of the inner cylinder 32 and the flange 8a on the lower end of the stopper metal fitting 8 are respectively caulked by an L-shaped part 33a formed outward in the radial direction over the whole periphery on the upper end of the outer cylinder 33 and bending the tip upward and a plurality of claw parts 33d, 33d, etc., formed upward on the upper end of a peripheral wall 33c of the L-shaped part 33a and bending the tip inward in the radial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid-filled vibration isolator.

  Conventionally, an automobile engine mount is well known as this type of vibration isolator. The basic structure is that a rubber elastic body is interposed between the engine-side coupling fitting that is a supported body and the vehicle body-side cylindrical fitting, and the volume changes as the rubber elastic body is deformed. A liquid chamber is formed between the two metal fittings, the liquid chamber is divided into a pressure receiving chamber and an equilibrium chamber, and an orifice passage is provided for communicating the pressure receiving chamber and the equilibrium chamber. When the liquid flows through the orifice passage, engine vibration in a predetermined frequency region can be effectively absorbed and attenuated.

  In addition, a cylindrical metal fitting is attached to the upper end of the support metal fitting so as to surround the connecting metal fitting. A flange formed radially outward at the lower end of the cylindrical metal fitting is caulked by a flange formed radially inward at the upper end of the support metal fitting.

  In this caulking, there is a so-called roll caulking that is caulked by a flange formed on the entire upper end of the support bracket, but a bracket for fixing the engine mount to the wheel apron is attached to the upper outer periphery of the support bracket. If this is the case, this bracket prevents the roll caulking jig from rotating, and such caulking cannot be performed.

So, what is shown in patent document 1 employ | adopts what is called a claw crimping which caulks by the several nail | claw part formed in the support metal fitting upper end.
JP 2004-11787 A

  FIG. 5 shows an example of an engine mount using claw caulking. The support fitting 103 has an inner cylinder 132 and an outer cylinder 133. A flange 132 a is formed radially inward at the lower end of the inner cylinder 132, and the flange 132 a is placed on the upper surface of a flange 133 a formed radially inward at the lower end of the outer cylinder 133. A flange 108 a at the lower end of the cylindrical metal fitting 108 is placed on the rubber elastic body 102. Then, in a state where the lower surface of the flange 133a at the lower end of the outer cylinder 133 is received by the receiving part 191, the tips of all the claw parts 133b are bent radially inward by the claw-caulking jig 190, and the flange 108a at the lower end of the cylindrical metal fitting 108 is The outer cylinder 133 is fixed by caulking 133b at the upper end. In FIG. 5, a two-dot chain line shows a state where the tip of the claw portion 133b is not bent, and a state where the solid line is bent.

  Here, since the vertical lengths of the inner cylinder 132 and the outer cylinder 133 are long, the inner cylinder 132 and the outer cylinder 133 are buckled when a large bending load is applied. If the claw portion 133b is made small and bent with a small bending load so that they do not buckle, the holding force due to the claw will be reduced, and caulking will occur when vibration in the front-rear and left-right directions is input to the engine mount. Part is slid and abnormal noise occurs.

  The present invention has been made in view of the above points, and the object of the present invention is to squeeze the caulking portion when the vibration in the front-rear direction and the left-right direction is input to the liquid-filled vibration isolator, and the noise This is to suppress the occurrence of the above.

  1st invention attaches so that the connection metal fitting connected to the to-be-supported body side, the cylindrical support metal fitting which supports this connection metal fitting through a rubber elastic body, and the above-mentioned connection metal fitting may be surrounded at the upper end of this support metal fitting The support bracket has an inner cylinder and an outer cylinder, and the upper end of the inner cylinder is entirely flanged radially outward. It is formed over the circumference, and a flange is formed on the lower end of the cylindrical fitting radially outwardly over the entire circumference, and the flange at the upper end of the inner cylinder and the flange at the lower end of the cylindrical fitting are An L-shaped part formed on the upper end of the outer cylinder over the entire circumference in the radial direction and having its tip bent upward, and formed upward on the upper end of the peripheral wall of the L-shaped part, respectively. The tip is caulked by a plurality of claws bent inward in the radial direction. The one in which the features.

  Thereby, the front-end | tip of a nail | claw part can be bend | folded radially inward in the state which received the bottom wall lower surface of the L-shaped part of the outer cylinder in the receiving part. Here, since the full length of the L-shaped part and the claw part of the outer cylinder in the vertical direction is short, the outer cylinder does not buckle even when a large bending load is applied. The inner cylinder is not buckled because it receives a bending load at the upper end flange. From these things, a nail | claw part can be enlarged and the retention strength by claw crimping can be enlarged. Therefore, when the vibration in the front-rear direction and the left-right direction is input to the liquid-filled vibration isolator, it is possible to suppress the generation of noise due to the caulking portion being slid.

  A second invention is characterized in that, in the first invention, the cylindrical metal fitting has substantially the same diameter as the outer cylinder.

  Thereby, since the cylindrical metal fitting is made into the substantially same diameter as an outer cylinder, the space between a connection metal fitting and a cylindrical metal fitting can be enlarged. Therefore, the design freedom of the liquid filled type vibration isolator can be improved.

  According to the present invention, the claw portion of the outer cylinder can be enlarged, and the holding force by claw caulking can be increased. Therefore, when vibrations in the front-rear direction and the left-right direction are input to the liquid-filled vibration isolator. In addition, it is possible to suppress the occurrence of abnormal noise due to the caulking portion being slid.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

-Overall structure of mount-
FIG. 1 shows an automobile engine mount A which is an embodiment of a liquid-filled vibration-proof support device according to the present invention. The engine mount A includes an automobile engine and a transmission (not shown) (hereinafter, both are summarized). The power plant is interposed between the power plant and the vehicle body to support the static load of the power plant and to absorb or attenuate the vibration from the power plant to suppress the transmission to the vehicle body. .

  The engine mount A of this embodiment has a substantially columnar connection fitting 1 attached to a power plant as a supported body via a bracket (not shown) and the like, and a cylindrical shape that supports this from below via a rubber elastic body 2. And a pair of legs 30, 30 welded to the front and rear sides (hereinafter simply referred to as the front and rear sides) of the automobile on the lower outer periphery of the support bracket 3, respectively. On the other hand, it is fixed to a wheel apron (not shown) by a bracket 31 welded to the right side of the automobile on the upper outer periphery of the support fitting 3. The support fitting 3 also functions as a case for the mount A together with a stopper fitting (tubular fitting) 8 described later.

  As shown in FIG. 2, the connecting metal fitting 1 has a flange portion 10 at an intermediate portion in the axis Z direction, a tapered portion 11 that is sunk downward on the lower side, and a shaft portion 12 on the upper side. , Each is formed. A bracket on the power plant side is attached to the upper end surface of the shaft portion 12, and a bolt (not shown) is screwed into the bolt hole 12a. In the illustrated example, the collar portion 10 has an annular shape centering on the axis Z, and annular stopper rubbers 6 and 7 are provided on the upper surface and the outer peripheral surface, respectively.

  The rubber elastic body 2 has a thick umbrella-shaped portion 20 that is vulcanized and bonded to cover the lower tapered portion 11 of the coupling metal 1 and extends obliquely downward while expanding radially therefrom. The cylindrical portion 21 is continuous with the lower end of the umbrella-shaped portion 20 and extends downward. The cylindrical portion 21 is fixed to the inner periphery of the support fitting 3. That is, the support fitting 3 has a double structure comprising an inner cylinder 32 and an outer cylinder 33 provided on the outer periphery in the example shown in the figure, and the outer peripheral surface of the cylindrical portion 21 of the rubber elastic body 2 is the inner surface thereof. While being bonded and fixed to the inner peripheral surface of the cylinder 32, the outer peripheral surface of the inner cylinder 32 is in surface contact with the inner peripheral surface of the outer cylinder 33.

  In addition, the cylindrical portion 21 of the rubber elastic body 2 has an inner diameter enlarged on the lower side to form an annular step portion. The orifice plate 4 is inserted from below as the step portion, and this orifice A rubber diaphragm 5 is disposed so as to cover the panel 4 from below. The diaphragm 5 has a bowl shape that opens upward as a whole. A thick portion 50 is formed around the opening edge and a reinforcing member 51 is embedded. The thick-walled portion 50 reinforced in this manner is liquid-tightly superimposed on the lower surface of the orifice plate 4 and caulked from below by a flange 32a integrally formed in the cylinder radial inward at the lower end of the inner cylinder 32 of the support fitting 3. It has been.

  The diaphragm 5 includes a cylindrical peripheral wall portion 52 that is continuous with the inner peripheral side of the thick portion 50 and is separated from the lower surface of the orifice plate 4 at a substantially right angle, and is curved downwardly at the lower edge thereof. An annular roll 53 is continuous. The central portion 54 of the diaphragm 5 that is folded back by the roll portion 53 is normally in the shape of a truncated cone. In other words, the diaphragm 5 normally has a central portion 54 folded upward to form a substantially W-shaped cross section, and the central portion 54 and the annular roll portion 53 surrounding the central portion 54 are turned upside down so that the volume is increased. It will change drastically.

  Thus, the lower end of the cylindrical portion 21 is closed by the diaphragm 5 whose volume changes, and a liquid chamber F in which liquid is sealed is formed inside the rubber elastic body 2. The liquid chamber F is divided into upper and lower portions by an orifice plate 4, the upper side thereof is a pressure receiving chamber f 1, and the lower side, that is, the portion partitioned by the orifice plate 4 and the diaphragm 5 is an equilibrium chamber f 2. When the vibration from the power plant is input and the rubber elastic body 2 is deformed, the volume of the pressure receiving chamber f1 mainly changes, and the liquid flows between the equilibrium chamber f2 via the orifice passage P. As the liquid flows in and out, the diaphragm 5 is deformed as described above, and the volume of the equilibrium chamber f2 changes (volume compensation).

  The orifice plate 4 is composed of a metal main body member 40 (hereinafter referred to as an orifice plate main body 40) and a lid member 41 to form a relatively thick disk as a whole, and the inside thereof is made of rubber. A movable plate 42 is accommodated. When an engine vibration having a relatively high frequency and a small amplitude is inputted, the movable plate 42 vibrates in synchronization with this vibration to absorb the fluid pressure fluctuation in the pressure receiving chamber f1.

  That is, the orifice board main body 40 has an annular standing wall portion 40a erected on the upper surface of a circular plate, and accommodates the movable plate 42 with the lid member 41 superimposed thereon. A plurality of through holes 41a, 41a,... Are formed in the lid member 41 so as to allow the storage chamber to communicate with the pressure receiving chamber f1, and similarly, the orifice plate body 40 is relatively disposed so as to communicate the storage chamber with the equilibrium chamber f2. Through holes 40b, 40b,... Are also formed in the area near the inner periphery.

  Further, on the outer periphery of the standing wall portion 40a, a groove portion that is surrounded by the lid member 41 and opens to the outer periphery side is formed over the entire periphery, and this groove portion is formed by the cylindrical portion 21 of the rubber elastic body 2 from the outer periphery side. By being surrounded, an annular orifice passage P is formed. One end of the orifice passage P faces the pressure receiving chamber f1 through an opening (not shown) on the upper surface of the lid member 41, and the other end faces the equilibrium chamber f2 through an opening (not shown) opened on the lower surface of the orifice panel main body 40. It is out. The orifice passage P is tuned to a vibration having a relatively low frequency and a large amplitude.

  On the other hand, a stopper fitting 8 having a cylindrical shape substantially the same diameter as the outer cylinder 33 is attached to the upper end of the support fitting 3 so as to surround the upper portion of the mount A such as the umbrella-shaped portion 20 of the rubber elastic body 2. ing. A flange 8a projecting radially outward is integrally formed at the lower end of the stopper fitting 8 over the entire circumference, and this flange 8a is placed on the upper end of the cylindrical portion 21 of the rubber elastic body 2. Further, a flange 32b is integrally formed on the upper end of the inner cylinder 32 of the support fitting 3 in the radially outward direction over the entire circumference, and the flange 32b is an upper surface of a bowl-shaped bottom wall 33b of an L-shaped portion 33a described later. It is mounted on. Then, the flange 8a at the lower end of the stopper fitting 8 is, along with the flange 32b at the upper end of the inner cylinder 32, over the entire circumference in the radially outward direction at the upper end of the outer cylinder 33 of the support fitting 3, as shown in FIGS. An L-shaped portion 33a having a substantially L-shaped cross section formed integrally with the tip bent upward, and an upper portion of the annular peripheral wall (outer wall) 33c of the L-shaped portion 33a are integrally formed upward. The tip is caulked from above by a plurality of claw portions 33d, 33d,... Having a substantially L-shaped cross section bent inward in the radial direction. That is, the claw portion 33d has a U-shaped cross section as a whole together with the L-shaped portion 33a. These nail | claw parts 33d, 33d, ... are arrange | positioned at equal intervals mutually except the part which opposes the bracket 31 at the upper end of the surrounding wall 33c. FIG. 3 shows a state where the tip of the claw portion 33d is not bent.

  As shown in FIG. 2, the stopper fitting 8 regulates the relative displacement in the front-rear direction and the left-right direction of the connecting fitting 1 by contacting the stopper rubber 7 of the collar portion 10. A flange 8b extending toward the inner peripheral side is formed at the upper end of the stopper fitting 8 so as to surround the shaft portion 12 of the connecting fitting 1. The lower surface of the flange 8b is formed on the stopper rubber 6 on the upper surface of the flange portion 10. By abutting, the upward displacement of the coupling metal 1 is regulated. Further, the upper surface of the flange 8b is in contact with an unillustrated bracket on the engine side so as to be restricted from moving upward, in other words, so as to restrict the relative displacement of the connecting metal fitting 1 downward. A rubber layer 80 is provided.

-Caulking process-
Hereinafter, the process of caulking the stopper fitting 8 and the inner cylinder 32 of the support fitting 3 with the outer cylinder 33 will be described with reference to FIG. First, the connecting metal 1, the rubber elastic body 2, and the inner cylinder 32 of the support metal 3 are vulcanized and integrally formed, and the mount work W to which the outer cylinder 33 of the support metal 3 and the stopper metal 8 are not attached is formed. Constitute. The flange 32b at the upper end of the inner cylinder 32 of the mount work W is placed on the upper surface of the bottom wall 33b of the L-shaped part 33a at the upper end of the outer cylinder 33, and the flange 8a at the lower end of the stopper fitting 8 is connected to the upper end of the cylindrical part 21 of the rubber elastic body 2. Put on. Then, in a state where the lower surface of the bottom wall 33b of the L-shaped portion 33a is received by the receiving portion 91, the upper ends of all the claw portions 33d, 33d,. The flange 8a at the lower end of the stopper fitting 8 and the flange 32b at the upper end of the inner cylinder 32 are fixed by caulking with the L-shaped portion 33a at the upper end of the outer cylinder 33 and the claw portions 33d, 33d,. In FIG. 4, a two-dot chain line shows a state where the tip of the claw portion 33d is not bent, and a state where the solid line is bent. Further, the claw jig 90 is formed so as not to interfere with the bracket 31 when the upper end of the claw portion 33d is bent.

-Effect-
As described above, according to the present embodiment, as described above, the tip of the claw portion 33d is bent inward in the radial direction in a state where the bottom surface 33b of the L-shaped portion 33a of the outer cylinder 33 is received by the receiving portion 91. be able to. Here, since the full length L in the vertical direction of the L-shaped portion 33a and the claw portion 33d of the outer cylinder 33 is short, the outer cylinder 33 does not buckle even when a large bending load is applied. Further, the inner cylinder 32 is not buckled because it receives a bending load at the flange 32b at its upper end. From these things, the nail | claw part 33d can be enlarged and the retention strength by claw crimping can be enlarged. Therefore, when vibrations in the front-rear direction and the left-right direction are input to the engine mount A, it is possible to suppress the generation of noise due to the caulking portions 32b, 33a, 33d, 8a being slid.

  Moreover, since the cylindrical metal fitting has substantially the same diameter as that of the outer cylinder 33, the space between the connecting metal fitting 1 and the stopper metal fitting 8 can be increased. Therefore, the degree of freedom in designing the engine mount A can be improved, for example, the stopper rubber 7 of the collar portion 10 can be enlarged.

(Other embodiments)
In the embodiment described above, the stopper fitting 8 has substantially the same diameter as the outer cylinder 33, but may have a smaller diameter than the outer cylinder 33. However, in order to improve the design freedom of the engine mount A, the former is desirable.

  In the above embodiment, the anti-vibration support device of the present invention is applied to the engine mount A. However, the present invention is not limited to this, and can also be applied to a suspension bush. Furthermore, it is not limited to automobile use.

  The present invention is not limited to the embodiments, and can be implemented in various other forms without departing from the spirit or main features thereof.

  As described above, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is defined by the claims, and is not limited by the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the present invention can be applied to applications such as suppressing the occurrence of abnormal noise due to the caulking portion being slid when vibrations in the front-rear direction and the left-right direction are input to the liquid-filled vibration isolator. .

It is a perspective view which shows the external appearance of the engine mount which concerns on embodiment of this invention. It is a longitudinal cross-sectional view which shows internal structures, such as the same liquid chamber. It is a perspective view which shows the external appearance of the outer cylinder of a support metal fitting. It is a fragmentary longitudinal cross-section which shows the manufacturing process of an engine mount. It is a fragmentary longitudinal cross-sectional view which shows the manufacturing process of the conventional engine mount.

Explanation of symbols

A Engine mount (liquid-filled vibration isolator)
DESCRIPTION OF SYMBOLS 1 Connection metal fitting 2 Rubber elastic body 3 Support metal fitting 32 Inner cylinder 32b Flange 33 Outer cylinder 33a L-shaped part 33c Peripheral wall 33d Claw part 8 Stopper metal fitting (cylindrical metal fitting)
8a Flange

Claims (2)

A connection fitting connected to the supported body side, a cylindrical support fitting for supporting the connection fitting via a rubber elastic body, and a cylindrical fitting attached to the upper end of the support fitting so as to surround the connection fitting; A liquid-filled vibration isolator comprising:
The support bracket has an inner cylinder and an outer cylinder,
A flange is formed on the upper end of the inner cylinder in the radially outward direction over the entire circumference,
At the lower end of the cylindrical metal fitting, a flange is formed over the entire circumference in the radially outward direction,
The flange at the upper end of the inner cylinder and the flange at the lower end of the cylindrical fitting are formed at the upper end of the outer cylinder over the entire circumference in the radial direction, and the L-shaped part whose tip is bent upward, A liquid-filled vibration isolator comprising a plurality of claw portions formed upward at the upper end of the peripheral wall of the L-shaped portion and having its tips bent radially inward. The liquid-filled vibration isolator according to claim 1,
The liquid-filled vibration isolator according to claim 1, wherein the cylindrical metal fitting has substantially the same diameter as the outer cylinder.

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