JP2006220261A - Vibration control rubber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control rubber having improved durability while hardly giving tensile stress or excessive compressive stress to a rubber molding when a great load is applied to the vibration control rubber. <P>SOLUTION: The vibration control rubber comprises the rubber molding 4 integrally vulcanized and adhered between a metal inner cylinder 2 and a metal flanged outer cylinder 3 in the state that its upper end face 4a and outer periphery 4b are exposed. To the lower end face of the rubber molding 4 corresponding to the further outside of the outer periphery of a flange 3b of the outer cylinder 3, a metal outer ring 5 formed separately from the flange 3b is integrally vulcanized and adhered concentrically with the outer ring 3. The outer ring 5 disperses stress concentration on the outer periphery of the flange 3b in the rubber molding 4 to prevent crack in or damage to such an area. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anti-vibration rubber used for an engine mount device of a construction machine such as a hydraulic excavator.

  Conventionally, as this type of anti-vibration rubber, for example, as shown in FIG. 11, a rubber molded body 4 has an upper end surface 4a and an outer peripheral portion 4b between a metal inner cylinder 2 and a metal flanged outer cylinder 3. The outer peripheral portion 4b of the rubber molded body 4 is formed in a vertical surface or in the shape of a truncated cone with an upwardly tapered shape. (For example, refer to Patent Document 1).

  The anti-vibration rubber is used, for example, in an engine mount device for a construction machine. As shown in FIG. 12, a pair of upper and lower vibration-proof rubbers 1, 1 are attached to the mounting holes 11 provided in the main body frame side bracket 10 of the construction machine, and the bosses 3 a of the inner cylinders 2, 2 and the outer cylinders 3, 3. , 3a are fitted to face each other. Then, a head-mounted bolt 13 is inserted into the engine-side bracket 12 disposed on the upper portion of the upper vibration-proof rubber 1 and the inner cylinders 2, 2 of the upper and lower vibration-proof rubbers 1, 1. The inner cylinder 13a is brought into contact with the upper surface of the engine-side bracket 12 and the nut 15 is tightened via a washer member 14 to a lower end portion of the lower vibration-proof rubber 1 of the bolt 13 projecting downward from the inner cylinder 2. 2 and 2 are butted together to give a pre-compression amount to the anti-vibration rubbers 1, 1 and then an engine (not shown) is mounted.

JP-A-8-281664 (paragraph number [0002], FIG. 4)

  However, in the above vibration-proof rubber, when a heavy load is applied to the vibration-proof rubber 1, such as when the construction machine bounces, the outer peripheral portion 4b of the rubber molded body 4 swells greatly outward, and tensile stress is generated. . When a large tensile stress is generated in the outer peripheral portion 4b of the rubber molded body 4, cracks b (see FIG. 11) are generated due to the stress concentration in the vicinity of the edge of the rubber molded body 4, particularly the end of the flange 3b of the rubber molded body 4. The deterioration of the durability performance due to the reduction of the spring constant of the molded body 4 is caused.

  The present invention has been made to solve such problems, and in the vibration-proof rubber as described above, means for dispersing stress concentration in the vicinity corresponding to the outer peripheral portion of the outer cylinder flange of the rubber molded body. It is an object of the present invention to provide an anti-vibration rubber that is less likely to generate a tensile stress or excessive compressive stress in the rubber molded body even when a large load is applied to the anti-vibration rubber, and that can improve durability. .

  The anti-vibration rubber of the present invention is integrally formed between a metal outer cylinder and a metal inner cylinder with a flange projecting outward at the upper end so that the upper end surface and outer peripheral portion thereof are exposed. In the vulcanized anti-vibration rubber, a metal outer ring formed separately from the flange is concentric with the outer cylinder on the lower end surface of the rubber molded body corresponding to the outer side of the outer periphery of the flange. It is characterized by being integrally vulcanized and bonded together.

  In this case, the outer ring may be equally divided in the circumferential direction. Further, the outer ring can be integrally vulcanized and bonded to the lower end surface of the rubber molded body so as to be biased downward from the flange of the outer cylinder. Furthermore, the annular bottom portion of the rubber molded body that exists in an annular shape between the outer ring and the flange can be formed to protrude downward from the outer ring and the flange.

  According to the vibration-proof rubber having the above-described configuration, the metal outer ring formed separately from the flange is concentric with the outer cylinder on the lower end surface of the rubber molded body corresponding to the outer side of the outer peripheral portion of the flange of the outer cylinder. When the heavy load is applied to the anti-vibration rubber, the outer ring moves up, down, left and right as the mass while dispersing the stress concentration on the outer periphery of the flange of the outer cylinder of the rubber molded body. This makes it difficult to generate tensile stress or excessive compressive stress in the vicinity of the outer peripheral portion of the outer cylinder flange of the rubber molded body, thereby preventing cracks and damage from occurring in that portion and contributing to improvement in durability performance.

  If the outer ring is equally divided in the circumferential direction, it becomes easy to work as a mass while dispersing the stress concentration at the outer periphery of the flange when the rubber molded product is deformed or loaded under large load, and the stress concentration of the rubber molded product in the vicinity is reduced. It can be reduced more.

  The outer ring is integrally attached to the lower end surface of the rubber molded body so as to be biased downward from the flange of the outer cylinder, so that the vibration isolating rubber is attached to the mounting member as will be clarified in the description in the embodiments described later. A pre-compression force can be effectively applied to the rubber molded body when it is attached to the rubber member, and the tightening force on the attachment member can be increased (see paragraph [0020]).

  An annular bottom portion of a rubber molded body that exists in an annular shape between the outer ring and the flange of the outer cylinder is formed so as to protrude downward from the outer ring and the flange, as will be clarified in the description in the embodiments described later. When this anti-vibration rubber is attached to the attachment member, it is useful for preventing slippage of the flange of the outer cylinder with respect to the attachment member and preventing abnormal noise generation (see paragraph [0019]).

  A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a plan view of an anti-vibration rubber according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view illustrating a use state of the anti-vibration rubber in FIG. Is a cross-sectional view of an anti-vibration rubber according to another embodiment, FIG. 5 is a bottom view of the anti-vibration rubber of FIG. 4, FIG. 6 is a plan view of the anti-vibration rubber according to another embodiment, and FIG. FIG. 8 is a cross-sectional view showing the state of use of the anti-vibration rubber of FIG. 7, and FIG. 9 is a cross-sectional view of the anti-vibration rubber showing still another embodiment.

  1 and 2, the overall structure of the anti-vibration rubber 1 is the same as that of the conventional one shown in FIG. 11, and a metal inner tube 2 and a flange 3b projecting outward from the upper end of the boss 3a. The rubber molded body 4 is integrally vulcanized and bonded to the metal flanged outer cylinder 3 so as to expose the upper end surface 4a and the outer peripheral portion 4b. The rubber molded body 4 is provided so as to surround the outer peripheral portion of the inner cylinder 2, and the flanged outer cylinder 3 is provided on the lower end surface of the rubber molded body 4.

  In the present invention, in the vibration-proof rubber 1, the lower diameter surface of the rubber molded body 4 corresponding to the outer side of the flange 3b of the outer cylinder 3 is larger than the outer diameter of the flange 3b separately from the flange 3b. A metal outer ring 5 formed in a circular shape is characterized by being vulcanized and bonded integrally with the outer cylinder 3.

  The anti-vibration rubber 1 configured as described above is used, for example, in an engine mount device for a construction machine, as in the case of the conventional anti-vibration rubber described above. In the use, as shown in FIG. 3, a pair of upper and lower vibration-proof rubbers 1, 1 are attached to each of the inner cylinders 2, 2, and The bosses 3a of the outer cylinder 3 are fitted so as to face each other, and the engine-side bracket 12 disposed on the upper part of the upper anti-vibration rubber 1 and the inner cylinders 2, 2 of the upper and lower anti-vibration rubbers 1 and 1, respectively. The inner cylinders 2 are connected to each other by inserting a head bolt 13 and tightening a nut 15 via a washer member 14 to a lower end portion of the lower vibration-proof rubber 1 of the bolt 13 projecting downward from the inner cylinder 2. And the anti-vibration rubbers 1 and 1 are set in a precompressed state, and then an engine (not shown) is mounted.

  As described above, the anti-vibration rubber 1 is attached to the main body frame side bracket (attachment member) 10 of the construction machine, and as a result, the rubber molded body 4 is integrally added to a portion corresponding to the outer side of the outer periphery of the flange 3b. The sulfur-bonded metal outer ring 5 disperses the stress concentration at the outer periphery of the flange 3b of the rubber molded body 4 and can prevent cracks and damage near the outer periphery of the flange 3b of the rubber molded body 4.

  In the above embodiment, the outer ring 5 is formed in a circular shape. Instead, as shown in FIGS. 4 and 5, the outer ring 5 is formed in an equally divided shape in the circumferential direction to form a plurality of partial arcs. It may consist of divided pieces 5a. The equally divided outer ring 5 can easily move up and down and left and right as a mass when the rubber molded body 4 is largely deformed and loaded, and the stress concentration of the rubber molded body 4 in the vicinity thereof can be further reduced.

As shown in FIGS. 6 and 7, the annular bottom portion 4 c of the rubber molded body 4 that exists in an annular shape between the outer ring 5 and the flange 3 b of the outer cylinder 3 is formed so as to protrude downward from the outer ring 5 and the flange 3 b. be able to.
According to this, as shown in FIG. 8, the pair of upper and lower vibration isolating rubbers 1, 1 are used on the main body frame side of the construction machine, for example, in the same manner as in the case of using the above-described engine mounting device for a construction machine (FIG. 3). Since the annular bottom portion 4c of the rubber molded body 4 protruding downward from the outer ring 5 and the flange 3b is brought into frictional contact with the bracket 10 when attached to the bracket (attachment member) 10, the flange of the outer cylinder 3 is subjected to shear deformation. The effect of preventing 3b from sliding on the bracket 10 is exhibited. The slip prevention prevents the boss portion 3a of the outer cylinder 3 from colliding with the inner peripheral wall of the mounting hole 11 of the bracket 10 to generate noise or damage the outer cylinder 3.

In each of the above embodiments, the outer ring 5 is vulcanized and bonded to the lower end surface of the rubber molded body 4 so as to be positioned on the same plane as the outer peripheral end of the flange 3b. Instead, as shown in FIG. 5 can be integrally vulcanized and bonded to the lower end surface of the rubber molded body 4 so as to be biased downward from the flange 3 b of the outer cylinder 3.
In such a case, as shown in FIG. 3, when the anti-vibration rubbers 1 and 1 are attached to the bracket (attachment member) 10 in a pre-compressed state by tightening bolts 13 and nuts 15, the outer ring 5 of the rubber molded body 4 is first attached. Since the pre-compression force is applied by pressing and contacting the bracket 10, and then the flange 3 b press-contacts the bracket 10, the pre-compression force can be effectively applied to the rubber molded body 4. The tightening force against can be increased.

  As shown in FIGS. 10A to 10C, chamfering (C chamfering, R chamfering) is preferable for reducing the stress concentration in the vicinity of the inner ring corner of the outer ring 5 and the corner of the outer periphery of the flange 3b. . Those chamfered portions are denoted by reference c.

It is a top view of the vibration isolator which shows one Example of this invention. It is the sectional view on the AA line in FIG. It is sectional drawing which shows the use condition of the vibration isolator of FIG. It is sectional drawing of the vibration proof rubber which shows another Example. It is a bottom view of the vibration-proof rubber of FIG. It is a top view of the vibration isolator which shows other Example. It is the BB sectional view taken on the line in FIG. It is sectional drawing which shows the use condition of the vibration isolator of FIG. Furthermore, it is sectional drawing of the vibration isolator which shows another Example. (A), (b), (c) is a partial cross-sectional view of an anti-vibration rubber showing another embodiment. It is a longitudinal cross-sectional view of the vibration-proof rubber of a prior art example. It is sectional drawing which shows the use condition of the vibration isolator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anti-vibration rubber | gum 2 Inner cylinder 3 Outer cylinder 3b Flange 4 Rubber molded object 4a The upper end surface of a rubber molded object 4b The outer peripheral part of a rubber molded object 4c Annular bottom part 5 Outer ring

Claims (4)

An anti-vibration rubber in which a rubber molded body is integrally vulcanized and bonded so as to expose the upper end surface and the outer peripheral portion between a metal outer cylinder with a flange projecting outward at the upper end and a metal inner cylinder In
A metal outer ring formed separately from the flange is integrally vulcanized and bonded concentrically with the outer cylinder to the lower end surface of the rubber molded body corresponding to the outer side of the outer peripheral portion of the flange. Anti-vibration rubber characterized by that.   The anti-vibration rubber according to claim 1, wherein the outer ring is equally divided in a circumferential direction.   The anti-vibration rubber according to claim 1 or 2, wherein the outer ring is integrally vulcanized and bonded to a lower end surface of the rubber molded body so as to be biased downward from a flange of the outer cylinder. The annular bottom portion of the rubber molded body that exists in an annular shape between the outer ring and the flange is formed in a shape protruding downward from the outer ring and the flange. Anti-vibration rubber as described.

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