JPH0953684A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration isolating device wherein the number of part items and mounting sites on a frame can be lessened by eliminating necessity for a vertically moving stopper. SOLUTION: In a vibration isolating device, a vibration isolator comprising a rubber-made cushion member 12 and a coil spring 13 is provided with a bolt shaft 10 with flange plate 11 serving as the center axis, the flange plate and the vibration isolator are compressedly received in a telescopic cylinder 15, a compression extending/contracting cylinder protruding both ends 10a, 10b of the bolt shaft to outside a cylinder is mounted between upper/lower frames 3, 4 with a rubber-made cushion plate 18, and a fixing nut 21 and a tightening adjusting nut 20 are provided in both the protruded end parts of the bolt shaft. This vibration isolating device resists against horizontal swiveling by the fixed bolt shaft, and the adjusting nut 20 is used to concurrently serve as an upper limit stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device to be mounted on an anti-vibration stand of a large rotating machine or the like.

[0002]

2. Description of the Related Art An anti-vibration stand for supporting an air-conditioning machine or the like installed on a rooftop of a building usually has a pair of an anti-vibration device having a coil spring and a stopper arranged between the upper and lower stands. In addition to the large number of parts to be mounted on the frame, the mounting and adjustment work was troublesome. Although the stopper is fixedly installed on the pedestal, the anti-vibration device is movably installed so that it can be installed according to the vibration characteristics of the equipment, etc. There is a drawback to

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a vibration isolator which can reduce the number of required parts and the number of mounting points by eliminating the conventional stopper.

[0004]

A vibration isolator according to the present invention comprises a rubber cushion member and a vibration isolator consisting of a coil spring fitted around a bolt shaft to which a collar plate is fixed, and is fitted with the collar plate. The vibration-damping body is compressed and accommodated in a telescopic cylinder composed of an outer cylinder with a lower end opening with an inner collar and an upper cylinder with an upper end opening with an outer collar, and the compression and expansion and contraction tube formed by projecting both ends of the bolt shaft out of the cylinder is a rubber cushion. It is mounted between the upper and lower pedestals together with the plate, and is provided with a fixing nut and a tightening adjustment nut at both projecting ends of the bolt shaft. In the present invention, the inner cylinder bottom is fixed by being sandwiched between the collar plate and the frame. Further, the vibration isolator in the compression / expansion cylinder is pre-loaded when it is installed in the cylinder, but after mounting the pedestal, it is further adjusted to a predetermined pre-load by the nut and receives the load of the upper pedestal. The anti-vibration device of the present invention can be used upside down between the mounts, in which case the inner cylinder is the outer cylinder, the outer cylinder is changed to the inner cylinder, and the spring pressure is adjusted by the lower nut.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a blower, 2 is a motor, 3 is an upper frame for supporting them, and 4 is a lower frame. Reference numeral 5 is a conventional vibration isolator or vibration absorber provided between the two mounts, and 6 is a stopper fixedly mounted on the mount. In the conventional device, the vibration isolator and the stopper are usually used as a pair, but, for example, in the case of a device that is violently rocked at the time of start-up, the vibration isolator has a structure that can be added and moved to an appropriate place. There is. For this reason, the conventional anti-vibration device does not function at all with respect to horizontal rocking, and may fall off due to rocking. FIG. 3 is a sectional view of the vibration isolator of the present invention, in which 10 is a bolt shaft, and 11 is a collar plate fixed to a part of the bolt shaft by welding or the like. 12 is a rubber cushion member, 1
3 is a coil spring, and 14 is an upper seat, which are housed together with the collar plate 11 in a synthetic resin telescopic tube 15 in a compressed state, and the upper end 10a and the lower end 10b of the bolt shaft penetrate the telescopic tube. Project outside. The expandable / contractible cylinder 15 is composed of an outer cylinder 16 with a lower end opening with an inner collar and an upper cylinder 17 with an upper end opening with an outer collar. The inner flange 16a and the outer flange 17a are locked to each other to preload a vibration isolator including a coil spring and a cushion body. Holding A shock absorbing rubber cushion plate 18 is inserted through a bolt shaft between the upper surface of the telescopic cylinder and the upper frame. 19 is a rubber bush, 20
Is an upper nut for tightening adjustment, and 21 is a lower nut for fixing. The bottom portion of the inner cylinder is clamped between the lower plate 21 and the collar plate 11 on which the bolt shaft 10 is suspended, and is clamped together with the lower frame to be fixed on the lower frame 4. Further, the vibration of the upper mount of the bolt shaft 10 is insulated by the cushion plate 18 and the rubber bush 19. In the above device, the vertical swing of the upper mount is absorbed by the cushion plate 18, the coil spring 13 and the cushion member 12, and the upper nut 20 screwed to the bolt shaft 10 functions as an upper limit stopper to cause a large swing. It is preventing. Further, the bolt shaft 10 resists the lateral swing together with the fixed telescopic cylinder.

[0006]

The anti-vibration device of the present invention functions against vertical and horizontal oscillations, and since it does not need to be provided as a pair with a stopper as in the prior art, the number of installations is halved, and the conventional anti-vibration device or stopper position It can be freely installed in any of the above. Further, the upper nut 20 serves as an upper limit stopper, and the spring load can be adjusted by the nut. Further, when the machine is installed on the gantry and transported, the supporting member A may be interposed between the upper and lower gantry and tightened by the nut 20 to be used as a fixture.

[Brief description of drawings]

FIG. 1 is a front view of a conventional anti-vibration mount including a vibration isolator and a stopper.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view of the anti-vibration device of the present invention.

[Explanation of symbols]

 10 Bolt Shaft 11 Fixed Collar Plate 12 Cushion Member 13 Coil Spring 15 Expandable Cylinder 18 Cushion Plate 19 Rubber Bushing 20 Upper Nut 21 Lower Nut

Claims (1)

[Claims] 1. A vibration-damping body composed of a rubber cushion member and a coil spring is fitted and arranged around a bolt shaft to which a collar plate is fixed as a central axis, and the collar plate and the vibration-proof body are fitted with an inner collar and a lower end opening outer cylinder. And a compression / expansion cylinder, which is compressed and housed in an expansion cylinder including an upper opening inner cylinder with an outer collar, and has both ends of the bolt shaft protruding outside the cylinder, is mounted between the upper and lower mounts together with a rubber cushion plate, Anti-vibration device with fixing nuts and tightening adjustment nuts provided on both projecting ends of the bolt shaft.