JPS6347301Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a vibration-isolating rubber structure that reduces the impact load by setting a low spring constant of the cylindrical vibration-isolating rubber, which is given an initial displacement by an initial load. .

(Prior Art) A conventional cylindrical anti-vibration rubber (sometimes called a rubber bushing), as shown in Fig. 6, consists of a metal cylindrical body 1 into which a shaft component is fitted, and a metal cylindrical body 1 which fits into a bearing side. Between the metal cylindrical body 2 and the metal cylindrical body 2, an inner cylinder 4 and an outer cylinder 5 are formed by covering the outer circumferential surface of the metal cylindrical body 1 and the inner circumferential surface of the metal cylindrical body 2 with a rubber material 3 for vibration isolation, A part of the outer surface of the inner cylinder 4 and a part of the inner surface of the outer cylinder 5 are supported by a plate-like member 3a of the rubber material 3 so that the inner cylinder 4 is eccentric with respect to the outer cylinder 5. As shown in FIG. 7, this cylindrical anti-vibration rubber is designed so that the inner cylinder 4 is located at the center of the outer cylinder in the suspended state.
The lower the spring constant of the plate-shaped body 3a, and the greater the initial load W, the greater the displacement in the direction opposite to the direction in which the load W is applied. Therefore, in the suspended state, the gap between the inner cylinder 4 and the outer cylinder 5 becomes larger on the eccentric side of the inner cylinder 4 (upper part in the figure).

(Problem to be solved by the invention) In the cylindrical anti-vibration rubber described above, the inner cylinder 4 is eccentric in the natural state, and the inner cylinder 4 is placed in the outer cylinder 5 in the suspended state.
Since the inner cylinder 4 and the outer cylinder 5 are provided so as to be located at the center of the cylinder, there is a problem that a gap becomes large between the inner cylinder 4 and the outer cylinder 5 on the eccentric side, and the impact force in that direction becomes weak.

This invention is intended to solve the above problems.
The present invention provides a vibration-proof rubber structure that reduces the initial gap in a suspended state to limit the amount of movement of the inner cylinder 4 and improves the impact resistance of the inner cylinder 4 in the eccentric direction.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an inner cylinder and an outer cylinder partially having a cut surface to form a double cylindrical body, and the outer cylinder is opened at its cut surface, and the inner cylinder is supported by a supporting member made of an elastic member at a position eccentric from the center position of the outer cylinder, and the outer surface of the inner cylinder is held open under no load. The anti-vibration rubber structure has a structure in which the inner cylinder is in contact with the inner surface of the eccentric side of the inner cylinder, and the inner cylinder is supported at the center position of the outer cylinder by separating the inner cylinder from the contact point of the outer cylinder in a loaded state. It is something.

(Function) The present invention uses the above-mentioned anti-vibration rubber structure to prevent the gap between the inner cylinder and the outer cylinder from increasing even when a load is applied to the inner cylinder and the inner cylinder moves to the center position of the outer cylinder. Therefore, the impact in the eccentric direction of the inner cylinder can be suppressed to a small level, and the impact load can be alleviated. By reducing the impact load, it becomes possible to reduce the spring constant of the cylindrical anti-vibration rubber structure.

(Example) Hereinafter, illustrated embodiments of the present invention will be described.

As shown in Figure 1, the side shape during rubber molding is obtained by cutting the metal cylinder 1 into which the shaft part fits and the metal cylinder fitting into the bearing side in the axial direction, or by bending the plate material. Using the metal outer cylinder 6 with the cut end slightly open, the metal cylinder 1 and the metal outer cylinder 6 are
A rubber material 7 is provided between. The rubber material 7 covers the outer peripheral surface of the metal cylinder 1 and the inner peripheral surface of the metal outer cylinder 6 to form an inner cylinder 4 and an outer cylinder 8, respectively. One protrusion part 9, 10 serving as a stopper for restricting movement is made to protrude toward the inner cylinder side at a position corresponding to both ends of the diameter when the outer cylinder body 8 is made into a cylindrical shape. The base portions of the support members 7a and 7b of the inner cylinder 4 on the outer cylinder body 8 side are positioned in a direction perpendicular to the positions of the protrusions 9 and 10. The supporting members 7a and 7b are arranged at the protrusion 9 side (the protrusion side located on the side where the cut of the outer cylinder 8 is provided) from the center position when the inner cylinder 4 and the outer cylinder 8 are made into a cylindrical shape in an unloaded state. ) to support it in an eccentric position.

As shown in FIG. 2, after rubber molding, the cut surfaces 11a and 11b of the outer cylinder 8 are brought into contact with each other, and the abutting metal outer cylinder 6 sides are joined by welding or the like to form a cylindrical vibration-proof rubber. do. In this state, the protruding portion 9 and the outer circumferential surface of the inner cylinder 4 come into contact with each other, and the respective rubber members 7 are crushed into a shape. The shaft component is fitted into the outer cylinder 4, and the outer cylinder body 8
When the inner cylinder 4 is fitted to the bearing side and a suspended load W is applied, the inner cylinder 4 moves in the opposite direction to the eccentric direction and is located at the approximate center of the outer cylinder 8, as shown in FIG. , the protrusion 9 and the outer circumferential surface of the inner tube 4 separate, creating a slight gap, and the gap between the protrusion 10 and the outer circumferential surface of the inner tube 4 narrows, adjusting the amount of movement of the inner tube 4 to an appropriate amount. . For the contact of the outer cylinder 8 after rubber molding,
In addition to welding the metal outer cylindrical body 6, as shown in FIG. As shown in Fig. 5, the outer cylinder 8 is fitted into the cylinder 15 with the cut surfaces 11a and 11b in contact with each other, thereby suppressing the expansion of the outer cylinder 8. It's good to wear.

In this embodiment, as described above, the gap between the outer circumferential surface of the inner cylinder 4 and the protrusions 9 and 10 provided on the inner circumferential surface of the outer cylinder body 8 can be appropriately restricted to a small value under load. It is possible to enhance the vibration isolation effect against loads. In particular, the gap between the protruding portion 9 and the inner cylinder 4 in the eccentric direction of the inner cylinder 4 can be reduced, and the buffering effect in this direction can be enhanced. Therefore, even when the initial load is large, the spring constant can be set low.

(Effects of the invention) As explained above, the present invention is characterized in that the outer cylinder is provided with a cut surface in order to overcome the restrictions on eccentricity caused by the diameter of the outer cylinder and the thickness of the elastic member. This makes it possible to exceed the conventional limit of eccentricity. The inner cylinder supporting member in the vibration-isolating rubber structure of the double cylindrical body having an inner cylinder and an outer cylinder allows the outer cylinder outer surface and the outer cylinder inner surface located on the eccentric side of the inner cylinder to touch each other when the inner cylinder is under no load. The outer surface of the inner cylinder and the inner surface of the outer cylinder, which are in contact with each other under load, are placed eccentrically at the position where they are in contact, and are separated from each other so that they are placed in a normal positional relationship, so the amount of movement of the inner cylinder during vibration is properly regulated. It is possible to increase the buffering effect. In particular, the buffering effect on the eccentric side of the inner cylinder is improved. Therefore, even when the initial load is large, the spring constant can be set low.

[Brief explanation of the drawing]

Figure 1 is a side view of the anti-vibration rubber according to the present invention during rubber molding, Figure 2 is a side view of the anti-vibration rubber according to the present invention when the cut surface is in contact with it, and Figure 3 is the load on the anti-vibration rubber according to the present invention. 4 is a perspective view of the vibration isolating rubber using the flanged metal outer cylindrical body according to the present invention, and FIG. 5 is a perspective explanation showing the vibration isolating rubber when fitted to the cylindrical body according to the present invention. Figure 6 is a side view of a conventional anti-vibration rubber in a no-load state.
FIG. 7 is a side view of a conventional anti-vibration rubber in a loaded state. DESCRIPTION OF SYMBOLS 1... Metal cylindrical body, 4... Inner cylinder, 6... Metal cylindrical body, 7... Rubber material, 7a, 7b... Support member, 8... Outer cylinder (outer cylinder), 9, 10... ...projection,
11a, 11b...Cut surface, W...Load.

Claims (1)

[Scope of utility model registration request] A double cylindrical body is formed by providing an inner cylinder and an outer cylinder partially having a cut surface, and with the outer cylinder open at the cut surface, the inner cylinder is supported by a supporting member made of an elastic member. The outer cylinder is supported at a position eccentric from the center position, and the outer surface of the inner cylinder is brought into contact with the inner surface of the outer cylinder on the eccentric side of the inner cylinder under no load,
Moreover, the vibration isolating rubber structure is characterized in that the inner cylinder is separated from the abutting portion of the outer cylinder under load, and the inner cylinder is supported at the center position of the outer cylinder.