JPH0615149Y2 - Liquid-sealed elastic bush stopper - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to a liquid-sealed elastic bush used for an engine mount of an automobile, etc., in which an object to be elastically supported by the elastic bush, that is, an engine is excessively large. It relates to a stopper of a liquid-sealed elastic bush that regulates it when it is displaced to.

(B) Conventional Technology and Problems There are usually provided stoppers as described above in such liquid-sealed elastic bushes. The structure of this stopper is, for example, as follows. there were.

Japanese Unexamined Patent Publication No. 60-49147 discloses a so-called dangling stopper that is not fixed in the liquid chamber. However, when the inner cylinder is abruptly over-displaced, the stopper is regulated. It does not fit properly in the regular position, the allowable displacement cannot be taken, or the regulation is not sufficient,
Therefore, the stopper effect does not increase, the engine displaces excessively, and in the worst case, it may be damaged. Also,
In such a case, the durability of the elastic bush itself will be impaired.

Japanese Unexamined Patent Publication No. 61-65935 discloses that a stopper is provided so as to fill the inside of the liquid chamber and the central portion of the stopper is projected to the inner cylinder side. It will come into contact with the wall of the liquid chamber and be regulated, which may impede smooth elastic deformation when an axial load is applied. Further, it is expected that abrasion due to rubbing of rubbers will occur and durability will be reduced, and that the volume of the liquid chamber will be narrowed and the damping property will be deteriorated.

(C) Means for Solving the Problems Therefore, according to the present invention, two side walls made of a rubber elastic body are provided between a rigid outer cylinder and an inner cylinder, which are arranged in parallel, at a predetermined interval to form a shaft core. A space is formed by stretching at right angles, and a partition wall made of two rubber elastic bodies is stretched between the outer cylinder and the inner cylinder in this space in parallel with the axis to divide the space into upper and lower spaces. An outer cylinder or inner cylinder provided in the liquid chamber of a liquid-sealed elastic bush that allows liquid to be enclosed in a separated space to form a liquid chamber and communicates between the liquid chambers with an orifice structure. Is an arc-shaped stopper that restricts the excessive displacement of the partition wall, and the stopper is installed between the outer peripheral side end portions of the partition wall along the inner periphery of the outer cylinder. The end that abuts against the side wall is formed as a wide wing-shaped part that also abuts the side walls on both sides, and the central part has a narrower width than the wing-shaped part. The above-mentioned problems are solved by providing a stopper for a liquid-sealed elastic bush characterized in that it is formed as a bridge portion.

(D) Action From the above, the end of the stopper that abuts the outer peripheral side edge of the partition wall has a wide wing-shaped portion that also abuts the side walls on both sides. Absent. In addition, since the bridges are narrow bridges other than the wing-shaped parts, this part does not contact the side wall, does not impede its elastic deformation, and reduces the volume occupied by this in the liquid chamber to secure a sufficient amount of liquid. To help. Furthermore, when a core material is inserted in the stopper, the conventional non-linear relationship in the relationship between deflection and load is improved, and the stopper effect is further enhanced.

(E) Embodiment An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a liquid-sealed elastic bush, FIG. 2 is a lateral sectional view, and FIGS. 3 to 4 are plan views, side views of stoppers,
FIG. 5 is a sectional view taken along line VV in FIG. 4, FIGS. 6 to 7 are plan views and side views of another stopper, and FIG. 8 is VIII-V in FIG.
III sectional view, FIG. 9, FIG. 10 are plan views and side views of stoppers of other embodiments, FIG. 11 is a side view of stoppers of other embodiments, and FIG. 12 is XII-XII of FIG. A sectional view, FIG. 13 is a side view of a stopper of another embodiment, and FIG. 14 is a side view.
Fig. 13 is a cross-sectional view taken along the line XIV-XIV, and Fig. 15 is a graph showing the relationship between the deflection of this stopper and the load.

The liquid-sealed elastic bushes shown in FIGS. 1 and 2 are eccentric types that are pre-eccentric in the anti-load direction because they are used for engine mounts of automobiles. The inner cylinder 2 is parallel to the outer cylinder 1 composed of
Besides, they are eccentrically arranged, and a rubber elastic body 3 is molded between the outer cylinder 1 and the inner cylinder 2 to separate a plurality of liquid chambers 4 on the eccentric side and the eccentric side, respectively. An orifice structure 5 connects the liquid chambers 4 with each other. That is, the partition wall 3a of the rubber elastic body 3 is stretched at a substantially horizontal position between the outer cylinder 1 and the inner cylinder 2 in parallel with the axis of the outer cylinder 1 and at a right angle to the axis. The side wall 3b is stretched across the space, and the liquid chamber 4 is vertically separated by both of these members. In this case, the inner wall 2 has the above-mentioned partition wall 3a.
The liquid 6 can be enclosed in the liquid chamber 4 by molding the rubber elastic body 3 having the side wall 3 b and inserting it into the outer cylinder 1 in a suitable liquid 6. By the way, in this case, the side wall 3b on the side closer to the eccentric direction is bent inward on both sides. The reason is that by doing so, contraction and extension of the side wall 3b during vibration are promoted, and as a result, the movement of the liquid 6 between the liquid chambers 4 is facilitated. On the other hand, the above-mentioned orifice structure 5
The ring 7 having the groove 5a formed on the outer periphery is externally fitted to the inner cylinder 2, and the sleeve 8 is fitted on the outer periphery of the ring 7 to cover the inner cylinder 2 and both liquids of the sleeve 8 are formed. It is formed by providing an opening hole 5b in a portion inside the chamber 4. As a result, the liquid 6 in both liquid chambers 4 can freely move through the orifice structure 5 including the opening 5b and the groove 5a. Further, near the outer peripheral end of the rubber elastic body 3, a sleeve-shaped core metal 9 in which a portion where the liquid chamber 4 is located is cut out like a window is sealed to maintain strength. Further, in this case, the outermost circumference of the rubber elastic body 3 is set up slightly on the outer circumference side of the cored bar 9, and although not shown, a plurality of (2-5 If the ridges are formed, the sealing property of the liquid 6 will be improved.

As described above, if the outer cylinder 1 is fixed and the engine is connected to the inner cylinder 2, the engine is elastically supported, and at the same time, the inner cylinder 2 comes to the center position of the outer cylinder 1 due to the supporting load. (See FIG. 2), at this time, a stopper 10 is enclosed in the liquid chamber 4 in order to restrict excessive displacement of the engine, that is, the inner cylinder 2, and the stopper 10 is configured as follows. It

That is, the stopper 10 is basically installed along the inner circumference of the outer cylinder 1 and in an arch shape between the outer peripheral side end portions 3aa of the partition wall 3a. In addition to this, the stopper 10 is
The outer peripheral side end 3aa of the partition wall 3a and this end 3
A wide wing-shaped portion 10a that abuts the side wall 3b is formed over a certain range 1a of the inner circumference of the outer cylinder 1 from aa, and a narrow bridge portion that creates a gap between the remaining portion and the side wall 3b. Set it to 10b. However, in this case, as shown in FIG. 2, the outer peripheral end portion 3aa of the partition wall 3a is formed inward from the outer cylinder 1 at right angles to the horizontal portion and the vertical portion. The wing-shaped portion 10a of 10 is also raised at a right angle so as to correspond to this, and is firmly attached as if it were fitted. Further, since the remaining bridge portion 10b of the wing-shaped portion 10a is narrower than the width of the liquid chamber 4, elastic deformation of the side wall 3b is allowed without contacting the side wall 3b, and inward bending of the side wall 3b is also possible. In addition, the volume of the liquid chamber 4 is not reduced. The shape of the stopper 10 in this case is slightly different because the shape and volume of the liquid chamber 4 in the initial state in which it is inserted are different. That is, the third
The one shown in FIGS.
Those shown in FIGS. 8 to 8 are on the deviation side. On the other hand, regarding the loading of the stopper 10 into the liquid chamber 4, before inserting the inner cylinder 2 molded with the rubber elastic body 3 into the outer cylinder 1, insert the stopper 10 into the corresponding position of the liquid chamber 4. Good.

Next, the stopper 10 may be simply a rubber elastic body, but if a rigid core material 11 such as an iron plate is enclosed inside as shown in FIGS. 11 to 14, the stopper effect is further improved. Increase. In this case, if the core material 11 is provided on the contact surface with other members (the outer peripheral side end portion 3aa of the partition wall 3a and the inner peripheral surface of the outer cylinder 1), that is, the outer peripheral surface of the wing portion 10a and the bridge portion 10b. The surface of this rigid body comes into contact with the outer cylinder 1 and the durability becomes higher.

The above is the description of the stopper 10 of the liquid seal type elastic bush for the engine mount in which the outer and inner cylinders 1 and 2 are eccentric, but the outer and inner cylinders 1 and 2 for the roll insulator are concentric with each other. The same applies to the stopper 10 in the bush.

(F) Effect of the invention As described above, the invention is as described above, that is,
Since the stopper is formed with a wide wing-shaped portion that contacts the left and right side walls at its end, it is firmly fixed to the outer peripheral end of the partition wall and does not displace, The pressure is small and the strength is high. On the other hand, since the remaining bridge portion has a narrow width, a gap is secured between the side wall and the side wall so as not to impede its elastic deformation, and the volume of the liquid chamber is not reduced, and the damping property is not deteriorated.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a liquid-sealed elastic bush, FIG. 2 is a lateral sectional view, and FIGS. 3 to 4 are plan views, side views of stoppers,
5 is a sectional view taken along line V-V in FIG. 4, FIGS. 6 to 7 are plan views, side views of another stopper, and FIG. 8 is VIII- in FIG.
VIII sectional view, FIGS. 9 and 10 are plan views and side views of stoppers of other embodiments, FIG. 11 is a side view of stoppers of other embodiments, and FIG. 12 is XII- of FIG. XII cross section, No. 13
The figure is a side view of a stopper of another embodiment, FIG. 14 is a sectional view taken along the line XIV-XIV of FIG. 13, and FIG. 15 is a graph showing the relationship between the deflection of the stopper and the load. (Reference number) 1 ... Outer cylinder 2 ... Inner cylinder 3 ... Rubber elastic body 3a ... Partition wall of rubber elastic body 3b ... Side wall 3a of rubber elastic body ... Outer end of partition wall 4 ... Liquid chamber 5 ... Orifice structure 6 ... Liquid 10 ... Stopper 10a ... Stopper blade 10b ... Stopper bridge 11 ... Core material

Claims (3)

[Scope of utility model registration request] 1. A space is formed between two rigid outer and inner cylinders, which are arranged in parallel, by laterally extending two side walls made of rubber elastic body at regular intervals and at right angles to the axis. A partition made of two rubber elastic bodies is stretched in parallel with the axis between the outer cylinder and the inner cylinder in the space to divide the space into upper and lower parts, and the liquid is enclosed in the separated space. A stopper for restricting excessive displacement of an outer cylinder or an inner cylinder provided in a liquid chamber of a liquid-sealing type elastic bush that allows liquid to move by connecting the liquid chambers with an orifice structure. This stopper has an arch shape that is installed between the outer peripheral side ends of the partition wall along the inner periphery of the outer cylinder, and the end part that abuts the outer peripheral side end part of the partition wall also contacts both side walls. A liquid seal characterized in that it is formed as a wide wing-shaped portion in contact with it, and the central portion is formed as a bridge portion that is narrower than the wing-shaped portion. Stopper of elastomeric bushing. 2. A stopper for a liquid-sealed elastic bush according to claim 1, wherein a rigid core material is enclosed in the stopper. 3. A stopper for a liquid-sealed elastic bush according to claim 1, wherein a rigid core material is attached to the outer peripheral surface of the stopper.