JPH0629639B2 - Liquid ring type elastic bush stopper device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stopper device for a liquid-sealed elastic bush suitable for use in a roll insulator of an automobile engine.

[Conventional technology]

Conventionally, even with bush type anti-vibration rubber, a liquid seal in which a liquid chamber communicating with an orifice structure is separated in a rubber elastic body and liquid is sealed inside in order to improve damping at large amplitudes. Type elastic bushing can be seen (eg patent 885820)
issue). It goes without saying that even with such a liquid-sealed elastic bush, a stopper device is required to regulate the inner and outer cylinders when they are relatively excessively displaced. However,
In the conventional stubber device, the stubber is usually provided in the liquid chamber, so that the volume of the liquid chamber is narrowed and the damping property is lowered.

[Problems to be Solved by the Invention]

For this reason, Japanese Patent Laid-Open No. 62-228728 proposes that the stover is provided outside the liquid chamber. However, this is because the stopper is simply provided outside the liquid chamber, so that the width of the inner cylinder and the outer cylinder is widened accordingly, leading to an increase in the size of the bush.

[Means for Solving the Problems]

In order to solve such a problem, the present invention relates to two side walls, which are stretched at right angles to an axis made of a rubber elastic body, between a rigid inner cylinder and an outer cylinder arranged in parallel. The liquid-sealing liquid chamber is vertically separated by two partition walls stretched in parallel with the shaft center, and the side wall is inward in the liquid-sealing elastic bush in which the liquid chambers are communicated by an orifice structure. A rigid stopper that bends and restricts the relative excessive displacement of the inner and outer cylinders whose head extends toward the outer cylinder is attached to the inner cylinder at the outer position of the side wall, and the head of the stopper is (EN) A stopper device for a liquid-sealed elastic bush, which is characterized in that the stopper device is widened by being inserted into a curved space.

[Action]

By taking the above means, the inner curved space of the side wall can be used as the installation space for the stover, so that it is possible to prevent the stopper from being pushed inward and the width from being increased. Furthermore, since the width of the head, which is the contact surface of the stovebar, can be increased,
The strength of the stover can be increased.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a liquid-sealed elastic bush showing an embodiment of the present invention, FIG. 2 is a transverse sectional view of the same, FIG. 3 is a side view,
FIG. 4 is a perspective view of a stopper, FIG. 5 is a longitudinal sectional view of a liquid-sealed elastic bush showing another embodiment, and FIG. 6 is a transverse sectional view of the same.

In this liquid-sealing type elastic bush, a metal inner cylinder 1 and an outer cylinder 2 are arranged in parallel, and a sleeve-shaped rubber elastic body 3 is integrally molded between the both, and the rubber elastic body 3
The two liquid chambers 5 in which the appropriate liquid 4 is enclosed are separated from each other. That is, two side walls 6 are provided at regular intervals to the inner cylinder 1 at a right angle to the axis, and two partition walls 7 are extended in the space partitioned by the side walls 6 in parallel with the axis. Then, by inserting a vertically separated space into the outer cylinder 1 in the liquid, the separated space becomes the liquid chamber 5 and the liquid 4 can be enclosed inside. By the way, in this case, the inner and outer cylinders 1 and 2 are positioned concentrically, and the side wall 6 portions on both sides in the vibration direction are bent inward. this is,
By doing so, the contraction and extension of the side wall 6 at the time of vibration are promoted, and as a result, the movement of the liquid 4 between the liquid chambers 5 is facilitated, and it is advantageous for the installation of a stubber described later. It should be noted that the strength of the rubber elastic body 3 is increased by inserting a cored bar 8 in which the liquid chamber 5 is cut out in a window shape near the outer peripheral end of the elastic body 3, and a layer of the rubber elastic body 3 is slightly provided outside the cored bar 8. If a plurality of ridges (not shown) are formed on the outer circumference and are formed on the outer circumference, the sealing property at the time of liquid sealing is improved.

As described above, by fixing the outer cylinder 2 to the fixing member and attaching the supported member (vibrating member) to the inner cylinder 1, the supported member can be elastically supported. Are communicated with each other by the orifice structure 9, and the movement of the liquid 4 occurs at this time, so that the vibration is attenuated by the flow resistance. This is the orifice structure 9 for this purpose. Here, the communication hole 10 is formed at an appropriate position of the partition wall 7,
A movable valve 11 having a cross-section is installed in the communication hole 10, and an orifice 12 that constantly connects the liquid chambers 5 is formed in the movable valve 11 to form the orifice structure 9 described above. It was The movable valve 11 operates so as to allow the movement of the liquid 4 between the liquid chambers 5 at the time of minute vibration and to regulate it at the time of relatively large vibration. That is, the valve body 11a of the sectional shape is fitted in the communication hole 10 with a considerable gap 13 and has a diameter larger than the diameter of the communication hole 10 at both ends and a length. It is equipped with a long valve head 11b. By doing so, the movable valve 11 does not move much at the time of slight vibration, and the liquid 4 freely moves through the gap 13 with the communication hole 10, but at the time of comparatively large vibration, the movable valve 11 moves and its valve moves. Since the head 11b contacts the partition wall 7 and closes the gap 13, the movement of the liquid 4 is restricted. The reason why the movable valve 11 behaves in this way is to reduce the dynamic spring constant at the time of minute vibration to enhance the vibration absorbing property and to exhibit the high damping property at the time of relatively large vibration. Therefore, the diameter and length of the orifice 12 must be set to suit this,
In particular, some length needs to be secured.

On the other hand, some shock is applied to the supported object, and the inner cylinder 1
If the displacement is excessively large, it may collide with the outer cylinder 2 due to a considerable impact and damage may occur. Therefore, the following stopper device 14 is provided to regulate this.

That is, as shown in FIG.
Is constituted by a stopper 15 fitted to the inner cylinder 1 outside the liquid chamber 5 and extending to the outer cylinder 2 side at a predetermined height. At this time, the stopper 15 is formed into a rectangular parallelepiped shape extending in the vibration direction (vertical direction), and a through hole corresponding to the diameter of the inner cylinder 1 is provided at the center thereof, and the inner cylinder 1 is provided with the through hole portion. It is conceivable that it fits on both ends of. The stopper 15 itself is made of metal, but its surface layer is thinly covered with rubber or the like in order to absorb impact at the time of collision. Further, the head portion of the stover 15 is made to be wide by being inserted into the inner curved space of the side wall 6.

Next, it is conceivable to provide the stopper device 14 also in the liquid chamber 5. That is, in the liquid chamber 5, the main body extending in the vibration direction of the outer cylinder 2 attaches the metal stopper 16 directly to the inner cylinder 2 by welding or the like (see FIGS. 5 and 6). The rubber elastic body 3 is also attached to the tip of the stopper 16.
Is continuously molded from the partition wall 7 or the like to cover it.

By the way, when the above stoppers 15 and 16 are provided both inside and outside the liquid chamber 5, if the height of the respective stoppers 15 and 16 is changed, the stopper performance becomes so-called two-step stoppers and the stopper performance is enhanced. In this case, if the taller material is made of an elastic material or the like, a certain damping effect is obtained. That is, as shown in FIG. 5, the stopper 16 in the liquid chamber 5
Is made taller than the external stopper 15, and at least the height of the end of the stopper 15 is molded with the rubber elastic body 3 to make the height of the metal portion lower than this. The rigidity of the taller one is lower than that of the lower one, and the rubber elastic body 3 is compressed between the time when the tip of the stopper 16 hits the outer cylinder 1 and the time when the tip of the stopper 15 hits, and the rigidity of the entire bush is improved. Has an increasing effect. From this point of view, the stopper function here includes not only the one that completely regulates the further displacement but also the one that performs a certain kind of vibration damping action.
However, if the lower stopper 15 collides with the outer cylinder 2, the displacement must be regulated at once.
Therefore, the rubber coating of the lower stopper 15 needs to be thin. FIG. 7 is a graph showing the relationship between the load and the displacement showing these facts. The displacement increases as the load increases. First, the taller stopper 16
Collides with the outer cylinder 1 (this point is designated as P1), and then the lower stopper 15 collides (this point is designated as P2). Therefore, the slope from P1 to P2, which is the vibration of acceleration / deceleration shock or speed range switching shock, becomes steeper and the rigidity is higher than from O to P1, which is the vibration during idling or normal running. It will be the actual situation. When P2 is exceeded, it is an abnormal situation in which the vehicle has climbed onto a foreign object or has fallen into a hole, etc. Therefore, it is necessary to completely restrict further displacement. ing.

By the way, the above is the liquid ring type elastic bush for the roll insulator with the initial load of zero, in which the inner and outer cylinders 1 and 2 are concentric, and the side walls 6 on both sides in the vibration direction are both bent inward. Even if the inner and outer cylinders 1 and 2 are eccentric in the load direction and one or both of the side walls 6 are straight liquid seal type elastic bushes for engine mounts, such a stopper device is used. It is clear that can be applied and derives a particular effect.

〔The invention's effect〕

As described above, the present invention is as described above, that is,
In a liquid-sealing type elastic bush in which a stopper that fits into the inner cylinder is provided outside the liquid chamber, the side wall of the liquid chamber is bent inward, and the head of the stopper is inserted into this inner curved space to widen the width. The space can be effectively used and the width of the stopper can be suppressed to reduce the overall size. Also, the width of the head, which is the contact surface of the stopper, can be widened, which increases the strength of the stopper.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a liquid-sealed elastic bush showing an embodiment of the present invention, FIG. 2 is a transverse sectional view of the same, FIG. 3 is a side view,
FIG. 4 is a perspective view of a stopper, FIG. 5 is a longitudinal sectional view of a liquid-sealed elastic bush showing another embodiment, FIG. 6 is a transverse sectional view of the same, and FIG. 7 is a liquid showing an embodiment of the present invention. It is a graph of the relation between the load and the displacement of the sealed elastic bush. (Code) 1 ... Inner cylinder 2 ... Outer cylinder 3 ... Rubber elastic body 4 ... Liquid 5 ... Liquid chamber 6 ... Side wall 7 ... Partition 9 ... Orifice structure 14 ... Stopper device 15 ... Stopper 16 …… Stopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 62-228728 (JP, A) JP 62-52234 (JP, A) JP 62-196434 (JP, A) JP 57- 58426 (JP, Y2)

Claims (2)

[Claims] 1. A pair of side walls, which are stretched at right angles to a shaft core made of a rubber elastic body, are provided between a rigid inner cylinder and an outer cylinder which are arranged in parallel, and are stretched between the side walls in parallel with the shaft core. In the liquid-sealing type elastic bush in which the liquid-sealing liquid chamber is vertically separated by the two partition walls provided and the liquid chambers communicate with each other by the orifice structure, the side wall is bent inward, and the head is outside. A rigid stopper that restricts the relative excessive displacement of the inner and outer cylinders extending to the cylinder side is fitted to the inner cylinder at the outer position of the side wall, and the head of the stopper is inserted into the curved space to widen it. A stopper device for a liquid-sealed elastic bush characterized in that 2. A rigid stopper for restricting relative excessive displacement of an inner and outer cylinder whose head extends toward the outer cylinder is fitted in the inner cylinder in the liquid chamber, and the back of the stopper in the liquid chamber is outside the liquid chamber. 3. The liquid-sealing elastic bush according to claim 1, wherein the height is lower than the back of the stopper and the head is molded with a rubber elastic body to be higher than the back of the stopper outside the liquid chamber. Stopper device.