JP2000145876A - Cylinder type liquid-filled type vibration control mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend an orifice flow passage, to increase an equal mass of liquid and to reduce a resonance frequency by circumferentially snakingly forming an orifice groove of an orifice forming member and forming an orifice inlet and outlet communicating with both a main liquid chamber and a sub-liquid chamber on both ends to form a whole to a Ω shape ion plane view. SOLUTION: In this vibration control mount, a rubber-like elastic body 5 is disposed between an inner cylinder 2 and an intermediate cylinder 3 and an orifice-forming member is disposed between the intermediate cylinder 3 and an outer cylinder. The orifice-forming member is formed by a pair of semi- cylinder members 26, 27 covering both a main liquid chamber and a sub-liquid chamber and an orifice groove 28 is provided on an outer periphery thereof. In this case, the orifice groove 28 is circumferentially snakingly formed as a whole and is formed to a Ω shape in plane view and orifice inlet and outlet 32, 33 communicating with both main and sub liquid chambers are formed on both ends. Thereby, a flow passage is extended in comparison with a conventional orifice passage having a C shape and an equivalent mass of liquid relating to a resonance is increased to reduce a resonance frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical liquid-filled vibration-proof mount suitable for mounting an engine on a vehicle body in a vibration-proof manner.

[0002]

2. Description of the Related Art In the recent development of new automobiles, miniaturization and weight reduction have become the most important issues, and miniaturization has also been required for engine mounts for supporting engines.

In a conventional liquid-filled anti-vibration mount, a rubber-like elastic body is vulcanized and bonded between an inner cylinder and an intermediate cylinder, and a main liquid chamber and an auxiliary liquid chamber opened on the outer periphery of the rubber-like elastic body. The liquid chamber communicates with the orifice formed between the orifice forming member outside the intermediate cylinder and the inner peripheral surface of the outer cylinder, and the flow resistance of the liquid flowing between the two liquid chambers through the orifice increases the flow resistance. Vibration damping performance is demonstrated. As an orifice forming member for obtaining such a large vibration damping characteristic, a member having an orifice groove formed in a C-shape in plan view is known.

[0004]

When the conventional liquid-filled anti-vibration mount is miniaturized, the volume elasticity of the rubber-like elastic body constituting the liquid chamber becomes high to support the engine load. In addition, the peak frequency of the vibration damping coefficient, which is most important as an engine mount, shifts from a low frequency side (for example, 12 Hz) to a high frequency side (for example, 20 Hz). In order to obtain desired vibration damping characteristics, the orifice flow path may be lengthened, but there is a limit in shifting the peak frequency to the lower frequency side in the conventional C-shaped orifice flow path.

[0005]

The inventor of the present invention has conducted intensive studies on the shape of the orifice groove for obtaining a desired vibration damping characteristic in accordance with the miniaturization of the anti-vibration mount. If it is formed in a meandering shape, and orifice inlets and outlets communicating with the main liquid chamber and the sub liquid chamber are formed at both ends thereof, and the whole is an orifice groove having a Ω shape in plan view, a C-shaped orifice flow path as in the related art can be obtained. It has been found that the orifice flow path becomes longer and the equivalent mass of the liquid involved in resonance increases, so that the resonance frequency can be lowered.

The Ω-shaped orifice groove in a plan view as described above has a rubber-like elastic body interposed between an inner cylinder and an outer cylinder arranged around the inner cylinder. A main liquid chamber and a sub liquid chamber that are opened on the outer peripheral surface side of the body, and an orifice forming member is arranged around the rubber-like elastic body so as to cover the opening surfaces of the main liquid chamber and the sub liquid chamber; A cylindrical liquid-filled anti-vibration mount with a space surrounded by an orifice groove formed in the circumferential direction of the outer peripheral surface and the inner peripheral surface of the outer cylinder as an orifice communicating the main liquid chamber and the sub liquid chamber. The present invention can be applied to any anti-vibration mount.

Specifically, it is possible to appropriately select a method of integrally vulcanizing and bonding the orifice forming member with the rubber-like elastic body or a method of fitting the orifice forming member later. In addition, it is possible to appropriately select whether to form the rubber-like seal portion for securing the sealing property of the orifice flow passage on the orifice forming member side or on the outer cylinder side. For example, when adopting a method in which the orifice forming member is later fitted to the rubber-like elastic body, when the rubber-like seal portion is formed on the inner peripheral surface side of the outer cylinder, and is bonded to the orifice forming member side This is preferable in that the bonding step can be performed easily. In this case, the rubber-like seal formed on the inner peripheral surface of the outer cylinder may be formed in a thin film shape. Even in this case, it is not necessary to necessarily form the rubber seal on the entire inner peripheral surface, and at least the orifice groove of the orifice forming member is partitioned. Sealability can be ensured only by forming a rubber-like seal film at a position facing the partition wall. However,
Forming on the entire surface is preferable in that the vulcanization bonding step can be simplified.

[0008] As the material of the orifice forming member, either resin or metal can be adopted. Further, the orifice forming member preferably has a cylindrical shape covering the entire circumference of the rubber-like elastic body from the viewpoint of securing a long orifice flow path.
When adopting the method of fitting the rubber elastic body later, in consideration of the assemblability to the rubber elastic body side, it is formed into a substantially cylindrical shape, that is, a C-shape viewed from the axial direction, and What is necessary is just to employ | adopt the structure fitted to a rubber-like elastic body using elasticity. In the case of such a substantially C-shaped configuration, it is better to adopt a mode in which at least the main liquid chamber-side orifice port and the sub-liquid chamber-side orifice port are separated from each other, a short circuit between the two orifice ports is prevented. Above, and furthermore
In order to prevent a short circuit in the flow path, it is desirable that a rubber-like seal member is disposed between both ends in the circumferential direction of the orifice forming member.

Further, considering the assemblability of the orifice forming member, the first semi-cylindrical member that covers the opening of the main liquid chamber and the second semi-cylindrical member that covers the opening of the sub-liquid chamber have an orifice groove. It is preferable to adopt a divided configuration for dividing the center of the flow path. In this case, a configuration may be adopted in which a partial flow path of the orifice is formed by a member on the rubber-like elastic body side or a member on the outer cylinder side in the divided portion.

Although the orifice forming member can be used as the vibration-proof mount regardless of the presence of the intermediate cylinder, the main liquid chamber and the sub-liquid chamber generated by the load from the engine mount can be used. In consideration of the fact that the vibration damping characteristics change due to the change in the volume, a configuration in which an intermediate cylinder is interposed between the inner and outer cylinders is preferable. That is, a configuration is preferred in which an intermediate cylinder having windows that respectively open the main liquid chamber and the sub liquid chamber is bonded to the outer peripheral side of the rubber-like elastic body, and the orifice forming member is externally fitted to the outer peripheral side of the intermediate cylinder. It is.

As the orifice forming member in the anti-vibration mount having the intermediate cylinder, any of the above structures can be adopted. In particular, a divided structure composed of a first semi-cylindrical member and a second semi-cylindrical member can be adopted. It can be illustrated as a preferred embodiment.

In this case, the rubber-like sealing member for sealing between the end portions of the orifice forming member on the orifice entrance / exit side is:
The outer peripheral surface of the intermediate cylinder is vulcanized and adhered to the outer peripheral surface of the intermediate cylinder, and a convex portion is integrally formed at a position corresponding to the center dividing portion of the orifice by projecting the outer peripheral surface of the intermediate cylinder outward in the radial direction. A configuration in which the circumferential groove forming a part of the groove is formed can be suitably used.

The main liquid chamber and the sub liquid chamber can be adopted irrespective of whether or not the rubber part constituting the liquid chamber is of a diaphragm type. A thin film diaphragm is preferred in that large vibration damping characteristics can be obtained. In this case, the diaphragm can be formed by forming an arc-shaped through-hole penetrating in the axial direction on the outer peripheral side of the rubber-like elastic body, and forming the outer peripheral wall side into a thin film. If an intermediate cylinder is present, the above-mentioned through-hole may be formed, and a rubber-like elastic body may be vulcanized and bonded in a thin film shape corresponding to the window of the intermediate cylinder.

The inventor of the present invention compared the relationship between the vibration damping coefficient and the frequency of the anti-vibration mount having the Ω-shaped orifice groove and the conventional anti-vibration mount having the C-shaped orifice groove. As a result, under the same conditions, the peak frequency was about 24 Hz in the case of the C-shaped orifice, but was about 12 Hz in the case of the Ω-shaped orifice groove.
It was confirmed that the temperature had dropped to below (see FIG. 9).

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a cylindrical liquid-filled anti-vibration mount, FIG. 2 is a side view thereof, and FIG.
-A sectional view, FIG. 4 is a BB sectional view of FIG. 2, FIG. 5 is an exploded perspective view seen from the direction of arrow C in FIG. 3, FIG. 6 is an exploded perspective view seen from the direction of arrow D in FIG. 7 is an assembled perspective view seen from the direction of arrow C in FIG. 3, and FIG. 8 is a developed plan view of the orifice forming member.

As shown in the figure, a cylindrical liquid-filled anti-vibration mount 1 supports an automobile engine in an anti-vibration manner, and includes an inner cylinder 2, an intermediate cylinder 3 disposed around the inner cylinder 2, and an inner cylinder 3. An outer cylinder 4 disposed around the intermediate cylinder 3; a rubber-like elastic body 5 such as rubber or resin interposed between the inner cylinder 2 and the intermediate cylinder 3; And an orifice forming member 6 arranged.

The inner cylinder 2 is a metal cylindrical member around which a rubber-like elastic body 5 is bonded by vulcanization. As shown in FIGS. 5 and 6, the intermediate cylinder 3 is made of a cylindrical hard resin (or may be made of metal), and has a cylindrical portion 3 a eccentrically disposed around the inner cylinder 2 in an upward direction. On both sides in the axial direction (the length direction of the inner cylinder 2), flanges 3b that expand in the radial direction are integrally formed. The inner cylinder 2 is attached to the cylinder portion 3a of the intermediate cylinder 3.
A main liquid chamber side window 7 and a sub liquid chamber side window 8 are formed on both upper and lower sides of the opening.

As shown in FIG. 6, the partitioning portion which partitions between the window portions 7 and 8 of the intermediate cylinder 3 has a convex portion 10 which is raised outward in the radial direction and is integrally formed between the flanges 3b. When approaching the flange 3b side, the orifice 11
Are formed in the circumferential groove 13 which constitutes a part of the groove. The projection 10 functions as a partition wall for blocking a short circuit of the liquid flowing through the orifice 11 between the windows 7 and 8, and also functions as a part of the orifice 11 by the circumferential groove 13. Further, as shown in FIG.
Among the flanges 3a, a rubber-like sealing member 12 having a rectangular cross section protrudes from the outer peripheral surface opposite to the convex portion 10 with the inner cylinder 2 therebetween.

The rubber-like elastic body 5 connects the inner cylinder 2 and the intermediate cylinder 3 to each other by vulcanizing and bonding, and has windows 7, 8 of the intermediate cylinder 3 around the inner cylinder 2 around the inner cylinder 2. A main liquid chamber 15 and a sub liquid chamber 16 are formed. Main liquid chamber 15
As shown in FIG. 3, is formed below the inner cylinder 2 and has a fan-shaped cross section perpendicular to the axis, which requires the inner cylinder side. The main liquid chamber 15 is provided with an arc-shaped stopper 17 made of synthetic resin to absorb large displacement applied to the anti-vibration mount 1.

The rubber-like elastic body 5 has an arc-shaped through-hole 19 formed in the vicinity of the inner peripheral surface of the intermediate cylinder 3 opposite to the main liquid chamber 15 with the inner cylinder 2 interposed therebetween. The space surrounded by the upper wall surface of the through hole 19 and the sub liquid chamber side window 8 of the intermediate cylinder 3 is the sub liquid chamber 16, and the upper wall surface of the through hole 19 is formed into a thin film to form the diaphragm 20. I have.

As shown in FIG. 5, a metal diaphragm cover 22 comprising a reinforcing portion 22a having an arcuate cross section and flanges 22b bent on both sides in the axial direction is press-fitted into the through hole 19. Reinforcing part 22a of this cover 22
Is formed in the center of the plate 20 in order to secure the flexible deformation of the diaphragm 20, and the outer surface of the inner cylinder side is in contact with the peripheral rubber portion 5a of the inner cylinder 2.

The outer cylinder 4 is a metal cylindrical member,
The orifice forming member 6 is interposed and held between the intermediate cylinder 3 and the flange 22b of the diaphragm cover 22 at the both ends 4a in the axial direction by caulking as shown in FIG. Almost the entire inner peripheral surface of the outer cylinder 4
A rubber-like sealing film 24 in the form of a thin film for ensuring the sealing performance of the orifice 11 is vulcanized and bonded in elastic contact with the top of the partition wall of the orifice forming member 6.

The orifice forming member 6 is disposed on the outer peripheral surface side of the intermediate cylinder 3 as shown in FIGS.
A metal plate-like member divided from a first semi-cylindrical member 26 covering the opening of the main liquid chamber 15 and a second semi-cylindrical member 27 covering the opening of the sub-liquid chamber 16; Has an orifice groove 28 formed therein. The orifice groove 28 is formed such that the circumferential groove 13 of the convex portion 10 of the intermediate cylinder 3 disposed at the dividing portion between the two semi-cylindrical members 26 and 27 is the central portion of the flow path of the orifice 11 and, together with this, the circumferential direction as a whole. In a meandering shape, it is formed in an Ω shape in plan view. And, at both ends of the orifice groove 28, orifice inlets and outlets 32 and 33 communicating with the main liquid chamber 15 and the sub liquid chamber 16 that open to the windows 7 and 8 of the intermediate cylinder 3 are formed.

The first semi-cylindrical member 26 is, as shown in FIG.
When viewed from the axial direction of the inner cylinder 2, one end side is open to the central convex portion 10 side of the intermediate cylinder 3, the other end side in the axial direction is closed, and a groove 28 a meandering in an inverted S shape is pressed into a concave shape. An orifice inlet / outlet 3 communicating with the main liquid chamber 15 near the end-side closed portion.
2 are stamped and formed. On the other hand, the second semi-cylindrical member 27, when viewed from the axial direction of the inner cylinder 2, has one end side open to the central convex portion 10 side of the intermediate cylinder 3, the other end side in the axial direction closed and meanders in an S-shape. The groove 28b is pressed into a concave shape, and an orifice inlet / outlet 33 communicating with the auxiliary liquid chamber 16 is formed by punching near the closed portion on the other end side.

Therefore, the two semi-cylindrical members 26 and 27 are
As shown in the figure, the orifice groove 28 has orifice inlets and outlets 32 and 33 at both ends in the circumferential direction at the other end when viewed from the axial direction of the inner cylinder 2. It is formed symmetrically at the center. The meandering grooves 28a, 28b of the semi-cylindrical members 26, 27 are formed with partition walls 34 between the grooves and both ends in the axial direction, and the grooves 28a, 28
The straight portion b is formed in a state parallel to the circumferential direction, and the length thereof is also substantially equal to the length of each semi-cylindrical member in the circumferential direction.

The grooves 28c and 28d on the open ends of the semi-cylindrical members 26 and 27 communicate with the circumferential grooves 13 formed in the central convex portion 10 of the intermediate cylinder 3 to form an Ω-shaped plan view as a whole. Orifice groove 28 is formed. The ends of the semi-cylindrical members 26 and 27 on the groove opening side are formed with stepped portions 36 formed on both circumferential sides of the convex portion 10 of the intermediate cylinder 3 as shown in FIG.
a, 36b, and the end on the orifice entrance / exit side is mounted on the rubber-like seal member 12 of the intermediate cylinder 3.

The outer cylinder 4 is fitted around the outer periphery of the orifice forming member 6 and subjected to drawing, and the rubber-like sealing film 24 on the inner peripheral surface of the outer cylinder 4 and the partition wall 34 of the orifice forming member 6 are formed.
And the convex portion 10 of the intermediate cylinder 3 are in close contact with each other, and between the orifice groove 28 and the inner peripheral surface of the outer cylinder 4, the Ω-shaped orifice 1 is formed.
1 is formed. The orifice 11 may be set to a flow path length and cross-sectional area in accordance with the desired vibration damping characteristics, for example, an outside diameter φ80mm the vibration damping mount 1, one orifice cross-sectional area of 20 mm ^2, or 15 mm ² Can be exemplified.

In the anti-vibration mount 1 having the above-described structure, the rubber-like elastic body 5 is interposed between the inner cylinder 2 and the intermediate cylinder 3, and these are vulcanized and bonded to be integrated, and then the diaphragm cover 22 is rubber-like. A stopper 17 is provided in the main liquid chamber in a liquid tank filled with the liquid to be filled by being press-fitted into the through hole 19 of the elastic body 5, and the orifice forming member 6 is provided from the outer peripheral side of the intermediate cylinder 3.
After the semi-cylindrical members 26 and 27 are fitted and mounted, the outer cylinder 4 is press-fitted from the outer peripheral side, and the flanges 22b of the diaphragm cover 22 are caulked and fastened at both axial ends to complete the product. The completed anti-vibration mount 1 has one of the inner cylinder 2 and the outer cylinder 4 attached to the engine bracket and the other attached to the body, and supports the engine in a vibration-proof manner. Then, the inner cylinder 2 moves downward by the load of the engine,
In this embodiment, the inner cylinder 2, the intermediate cylinder 3, and the outer cylinder 4 are substantially concentrically arranged.

In the anti-vibration mount 1 in which the Ω-shaped orifice groove 28 is formed, the orifice flow path can be made longer than the conventional C-shaped orifice flow path. Increase and lower the resonance frequency.

FIG. 9 compares the relationship between the damping coefficient and the peak frequency between the anti-vibration mount having the Ω-shaped orifice in the present embodiment and the conventional anti-vibration mount having the C-shaped orifice. . As shown in FIG. 9, the peak frequency of the conventional anti-vibration mount was 24 Hz, whereas in the present embodiment, the peak frequency could be reduced to 12 Hz.

Further, between the orifice entrances 32 and 33 of the orifice forming member 6, a rubber-like sealing member 12 is provided to stand radially outward from the cylindrical portion 3 a of the intermediate cylinder 3 to form a weir. Since the ends of the two semi-cylindrical members 26 and 27 of the orifice forming member 6 are elastically sealed between the top of the seal member 12 and the outer cylinder 4, short-circuiting of the two orifice entrances 32 and 33 is prevented. can do.

[0032]

As is apparent from the above description, according to the present invention, the orifice groove of the orifice forming member is formed in a meandering shape in the circumferential direction, and the orifice inlet and outlet communicating with the main liquid chamber and the sub liquid chamber at both ends thereof. The orifice flow path is longer than that of the conventional C-shaped orifice flow path, and the equivalent mass of the liquid related to resonance increases, thereby lowering the resonance frequency. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a plan view of a cylindrical liquid-filled anti-vibration mount according to an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is an exploded perspective view seen from the direction of arrow C in FIG. 3;

FIG. 6 is an exploded perspective view seen from the direction of arrow D in FIG. 3;

FIG. 7 is an assembled perspective view seen from the direction of arrow C in FIG. 3;

FIG. 8 is a developed plan view of the orifice forming member.

FIG. 9 is a diagram illustrating a relationship between an attenuation coefficient and a peak frequency.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration-proof mount 2 Inner cylinder 3 Intermediate cylinder 4 Outer cylinder 5 Rubber-like elastic body 6 Orifice forming member 10 Convex part 11 Orifice 13 Circumferential groove 26, 27 Semi-cylindrical member 28 Orifice groove 32, 33 Orifice entrance / exit

Claims (7)

[Claims] 1. A rubber-like elastic body is interposed between an inner cylinder and an outer cylinder arranged around the inner cylinder, and on both sides of the inner cylinder,
A main liquid chamber and a sub liquid chamber are provided on the outer peripheral surface side of the rubber elastic body, and an orifice forming member is provided around the rubber elastic body so as to cover the opening surfaces of the main liquid chamber and the sub liquid chamber. Is disposed, and a space surrounded by an orifice groove formed in a circumferential direction of an outer peripheral surface of the orifice forming member and an inner peripheral surface of the outer cylinder is an orifice communicating the main liquid chamber and the sub liquid chamber. The orifice groove is formed in a meandering shape in the circumferential direction,
An orifice inlet / outlet communicating with the main liquid chamber and the sub liquid chamber is formed at both ends thereof. 2. An intermediate cylinder having windows that open to a main liquid chamber and a sub liquid chamber, respectively, is adhered to an outer peripheral side of the rubber-like elastic body.
The anti-vibration mount according to claim 1, wherein the orifice forming member is interposed between the intermediate cylinder and the outer cylinder. 3. The anti-vibration mount according to claim 1, wherein a rubber-like sealing film is formed on at least a position on an inner peripheral surface of the outer cylinder facing a partition wall that partitions the orifice groove. 4. The orifice forming member is divided at least between the orifice inlet and outlet on the main liquid chamber side and the orifice inlet and outlet on the sub liquid chamber side, and a rubber seal member is provided between both circumferential ends of the orifice forming member. Claim 1, which was interposed
2. The anti-vibration mount according to 2 or 3. 5. The orifice-forming member has a first semi-cylindrical member covering an opening of a main liquid chamber and a second semi-cylindrical member covering an opening of a sub-liquid chamber. 5. The anti-vibration mount according to claim 4, wherein a partial configuration of the orifice is formed by a member on the rubber-like elastic body side or a member on the outer cylinder side in a divided portion thereof. 6. A convex portion projecting outward in the radial direction is integrally formed at a position corresponding to the dividing portion of the intermediate cylinder, and a circumferential groove forming a partial flow path of the orifice groove is formed in the convex portion. The anti-vibration mount according to claim 5. 7. The anti-vibration mount according to claim 1, wherein the rubber-like elastic body on the side of the sub-liquid chamber is formed into a thin-film diaphragm and adhered to a window of the intermediate cylinder.