JP3072407B2 - Cylindrical liquid-filled anti-vibration 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 cylindrical liquid-filled anti-vibration mount suitable for supporting an engine on a vehicle body in a vibration-proof manner in an FF type vehicle or the like.

[0002]

2. Description of the Related Art Various types of cylindrical liquid-filled anti-vibration mounts that are interposed between an engine and a vehicle body and are supported in an anti-vibration manner so that vibrations of the engine do not directly propagate into a vehicle interior have been proposed. Although many of the mounts are practically used, there is a kind of such an anti-vibration mount, for example, as shown in FIGS.

That is, as shown in the drawing, the above-mentioned conventional anti-vibration mount includes an inner cylinder 1 provided horizontally, an intermediate cylinder 3 and an outer cylinder 2 which surround the inner cylinder 1 substantially in parallel with the axis, an inner cylinder 1 and an intermediate cylinder. 3, a rubber elastic body 5 interposed between them, a lower liquid chamber 6 formed below the inner cylinder by the elastic body 5, and a diaphragm 7 partially made of a rubber film. An orifice passage 9 is formed between the upper liquid chamber 8 formed above and the intermediate cylinder 3 and the outer cylinder 2 and communicates the liquid chambers 6 and 8 with the inner surface of the outer cylinder 2. And an orifice forming member 4.

The rubber elastic body 5 is composed of a pair of lateral connecting rubbers 10 for connecting the inner cylinder 1 and the outer cylinder 2 to each other in the axial direction as shown in FIG. The inner and outer cylinders 1 and 2 are connected and extended downward from both ends in the axial direction of the lateral connection rubber 10, respectively.
And the vertical connecting rubber 11 forming the lower liquid chamber 6.

[0005]

When the rubber hardness of the rubber elastic body is changed to three levels in the cylindrical liquid-filled anti-vibration mount as described above, static and dynamic characteristics as shown in FIG. 8 can be obtained.

That is, in order to change the dynamic spring constant of the anti-vibration mount, it is sufficient to change the rubber hardness of the rubber elastic body. However, since the damping coefficient and the static spring constant also change at the same time, the dynamic spring constant is changed. There is a problem that it is difficult to tune to the required characteristics such as reducing only

An object of the present invention is to solve the above-mentioned problems by addressing the above-mentioned situation and finding a new structure for the rubber elastic body.

[0008]

That is, the feature of the cylindrical liquid-filled anti-vibration mount of the present invention which meets the above-mentioned object is that the outer cylinder and the inner cylinder are connected to each other in the axial direction as described above. A pair of lateral connection rubbers, each of which connects the outer cylinder and the inner cylinder downward from both ends in the axial direction of these lateral connection rubbers and extends,
In addition, in the liquid-filled anti-vibration mount including a pair of vertical connection rubbers forming a liquid chamber with the horizontal connection rubbers, an axial distance between bottoms of the horizontal connection rubbers is set at both end surfaces of the vertical connection rubbers. This is where a bulge is formed which is substantially equal to the minimum axial distance between the end faces.

Further, in the above-described anti-vibration mount according to the present invention, the bulge has a flat bottom, and the bulge is continuously extended from the vicinity of the inner cylinder to the vicinity of the outer cylinder at both end surfaces of the lateral connection rubber. It is also possible to form.

[0010]

In the above-described cylindrical liquid-filled anti-vibration mount of the present invention,
By improving the lateral connection rubber in the axial direction, only the dynamic spring constant can be reduced while maintaining the damping coefficient and the static spring constant, thereby facilitating tuning to required characteristics. In addition, the dynamic spring constant can be kept at a predetermined low level even if the horizontal connecting rubber is shortened, so that the degree of freedom in the design of the anti-vibration mount is improved. Can also be saved.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view showing a cylindrical liquid-filled anti-vibration mount according to an embodiment of the present invention, FIG. 2 is a partial sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG. FIG. 4 is a plan view of the anti-vibration mount of the embodiment.

As shown in FIG. 3, an anti-vibration mount according to this embodiment includes an inner cylinder 1 which is provided laterally, an outer cylinder 2 which eccentrically surrounds the inner cylinder 1 and is axially parallel to the inner cylinder. A rubber elastic body 5 interposed through the intermediate cylinder 3 and the orifice forming member 4, a lower liquid chamber 6 formed below the inner cylinder 1 by the rubber elastic body 5, and a rubber film An upper liquid chamber 8 formed above the inner cylinder 1 by providing a diaphragm 7 made up of the above, and the upper and lower liquid chambers 6, 8 formed along the inner side of the outer cylinder 2 by the orifice forming member 4. And an orifice passage 9 for communication.

As shown in FIGS. 1 and 2, the rubber elastic body 5 includes a pair of horizontal connecting rubbers 10 for connecting the inner and outer cylinders 1 and 2 left and right in the axial direction. A vertical connecting rubber 11 that connects and extends the inner cylinder 1 and the outer cylinder 2 downward from both axial ends of the horizontal connecting rubber 10 and forms the lower liquid chamber 6 with the horizontal connecting rubber 10; In the embodiment of the present invention, the axial distance L between the bottom portions 13 is substantially the same as the minimum axial distance L 'between the end faces of the vertical connecting rubber 11 on both end surfaces of each horizontal connecting rubber 10. Is formed.

The damping coefficient between the anti-vibration mount according to the embodiment of the present invention and the conventional anti-vibration mount without forming a bulge is:
When the static spring constant and the dynamic spring constant were compared, results as shown in FIG. 5 were obtained. That is, in the anti-vibration mount of the present invention,
While maintaining the damping curve and static spring constant almost as usual, only the dynamic spring constant can be reduced, and tuning to the required characteristics becomes easy.

In general, the dynamic spring constant increases when the lateral connection rubber is shortened.
Even if the horizontal connecting rubber 10 is shortened, the dynamic spring constant can be kept at a predetermined low level, thereby improving the degree of freedom in design such as miniaturization of the anti-vibration mount. Further, since the amount of rubber of the rubber elastic body 5 is reduced by the above-mentioned bulging portion 12, material costs can be reduced and an economic effect can be obtained.

Although the embodiment of the present invention has been described above, the beveled portion of the present invention does not necessarily have to be formed continuously from the vicinity of the inner cylinder to the vicinity of the outer cylinder. It is also possible.

[0018]

As described above, the cylindrical liquid-filled anti-vibration mount of the present invention comprises a pair of lateral connecting rubbers for connecting the outer cylinder and the inner cylinder to the left and right in the axial direction, and these lateral connecting rubbers. The outer cylinder and the inner cylinder are connected and extended downward from both ends in the axial direction of the rubber, respectively, and a liquid chamber is formed with the laterally connected rubber.
In a liquid-filled anti-vibration mount having a pair of vertical connection rubbers, a longitudinal axis is provided on both end surfaces of each of the horizontal connection rubbers such that an axial distance between bottoms is substantially equal to a minimum axial distance between the vertical connection rubber end surfaces. The lateral connection rubber is made superior in the axial direction, so that only the dynamic spring constant can be reduced while maintaining the damping coefficient and the static spring constant. Tuning is easy, and the dynamic spring constant is kept at a predetermined level even if the horizontal connection rubber is shortened, so that the degree of freedom in the design of the anti-vibration mount is improved, and the rubber amount is improved by the beveled part. This has a remarkable effect that the material cost can be reduced because of the reduction.

[Brief description of the drawings]

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

FIG. 2 is a partial sectional view taken along line AA of FIG.

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

FIG. 4 is a plan view of the anti-vibration mount of the embodiment.

FIG. 5 is a graph comparing characteristics of the anti-vibration mount according to the embodiment of the present invention and a conventional anti-vibration mount.

FIG. 6 is a longitudinal sectional view at the center of a shaft showing a conventional cylindrical liquid-filled anti-vibration mount.

FIG. 7 is a sectional view taken along line XX of FIG. 6;

FIG. 8 is a graph showing characteristics when the hardness of a rubber elastic body is changed to three levels in a cylindrical liquid-filled anti-vibration mount.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 3 Intermediate cylinder 4 Orifice forming member 5 Rubber elastic body 6 Lower liquid chamber 7 Diaphragm 8 Upper liquid chamber 9 Orifice flow path 10 Horizontal connection rubber 11 Vertical connection rubber 12 Girder part 13

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Seiichi Hamate 3rd Ikuyama, Utsugoe, Miyoshi-cho, Nishikamo-gun, Aichi Pref. No. 3 Ikayama, Uchikoshi, Miyoshi-cho Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (56) References JP-A-2-300539 (JP, A) 4-34536 (JP, U) JP-A-4-74755 (JP, U) JP-A-5-30584 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16F 13/14 B60K 5/12

Claims (2)

(57) [Claims] 1. A pair of lateral connecting rubbers for connecting an outer cylinder and an inner cylinder disposed in the outer cylinder substantially in parallel to each other in the axial direction, and a pair of lateral connecting rubbers from both ends in the axial direction of the lateral connecting rubbers. In a cylindrical liquid-filled anti-vibration mount including a pair of vertical connecting rubbers that connect and extend the outer cylinder and the inner cylinder downward and form a liquid chamber with the horizontal connecting rubber, respectively, A cylindrical liquid-filled anti-vibration mount, characterized in that, at both end surfaces of the horizontal connection rubber, a threaded portion is formed in which the axial distance between the bottom portions is substantially equal to the minimum axial distance between the vertical connection rubber end surfaces. 2. The cylindrical liquid filling prevention device according to claim 1, wherein the hollow portion has a flat bottom portion and is formed continuously from the vicinity of the inner cylinder to the vicinity of the outer cylinder on both end surfaces of each of the lateral connection rubbers. Shake mount.