JPS609988Y2 - Fixed structure of shock mount - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shock mount fixing structure suitable for use in vibration-proof supporting precision equipment such as magnetic disk memory drive devices.

If a shock mount with a small spring constant is used to support precision equipment with vibration resistance, the natural frequency of the entire system will be lower, but a spring will be required to prevent left-right displacement, which will increase costs and take up a lot of space. there were.

For this reason, in recent years, shock mounts with a large spring constant have been used.

According to this, the natural frequency of the entire system becomes high, but the amount of lateral displacement becomes small, and an unnecessary spring is not required, but the support point is close to a rigid body, and the influence of distortion is likely to occur in the device.

FIG. 1 is an explanatory diagram of the operation when such a conventional shock mount fixing structure is used.

The shock mount 2 attached to the frame 1 is fixedly attached to the base plate 3, so if the frame 1 is attached to a chassis etc. in a twisted state, this twist will be directly applied to the base plate 3. This torsional force deforms the base plate 3 and generates stress strain.

When stress strain occurs in the base plate 3 in this way,
This greatly affects the dimensional accuracy of precision equipment mounted on the base plate 3.

This idea was devised in view of these points, and its purpose is to create a shock mount that does not apply stress or strain to the base plate on which the equipment is attached, even when using a shock mount with a large spring constant. The purpose is to provide a fixed structure.

In order to achieve this objective, this invention provides a through hole in the base plate and a receiving groove concentrically formed on the surface of the base plate, so that the vertical bolt of the shock mount attached to the fixed frame can be inserted into the through hole. A bowl-shaped diaphragm spring is sandwiched between a base plate and a nut that is passed through the base plate and screwed onto a vertical bolt.

This invention will be explained in detail below with reference to the drawings.

FIG. 2 is a sectional view of an embodiment of the shock mount fixing structure according to this invention.

In the figure, 10 is a fixed frame attached to a housing 11 etc. with metal fittings 12, 13 is a well-known shock mount made of rubber or the like attached to the surface of the fixed frame 10 by screws, and 14 is perpendicular to the shock mount 13. Al with molded vertical bolts.

On the other hand, 16 is a base plate on which precision equipment 17 is attached;
18 is a through hole formed in the base plate 16 with a predetermined inner diameter slightly larger than the outer diameter of the vertical bolt 14; 19.20
21 and 22 are diaphragm springs formed of bowl-shaped elastic metal plates;
, 22a are the open ends of the diaphragm springs 21 and 22, and 21b and 22b are the diaphragm springs 21 and 22.
The diaphragm portion 23, 24 is a nut screwed onto the vertical bolt 14.

In addition, in the center of the diaphragm spring 21, there is a third
As shown in the plan view of the figure, a center hole 21c is formed into which the vertical bolt 14 is inserted.

A center hole is similarly formed in the diaphragm spring 22.

When attaching the base plate 16 to the shock mount 13, first deeply screw the nut 24 onto the vertical bolt 14, then pass the vertical bolt 14 through the center hole and tighten the open end 22.
Attach the diaphragm spring 22 with a facing upward.

Next, the vertical bolt 14 passes through the through hole 18, and the receiving groove 20
The base plate 16 is set so that the opening end 22a is inserted into the base plate 16.

Furthermore, after the vertical bolt 14 is passed through the center hole 21c and the diaphragm spring 21 is installed so that the open end 21a enters the receiving groove 19, the nut 23 is screwed onto the tip of the vertical bolt 14.

The nuts 23, 24 are operated to adjust the support height of the base plate 16 relative to the fixed frame 10, and the diaphragm springs 21, 22 are held between the nuts 23, 24 and the base plate 16 with a predetermined force.

As a result, the shock mount 13 and the base plate 16 are fixed via the diaphragm springs 21 and 22.

In this configuration, the diaphragm spring has a much larger spring constant in the vertical direction than that of the shock mount, so the vertical bolt and base plate are fixed in the vertical direction as before. The shock mount absorbs vibrations.

However, in the left and right direction, the base plate has a degree of freedom relative to the vertical bolt due to the action of the diaphragm section.

However, the degree of freedom is within the gap between the through hole and the vertical bolt.

Therefore, even if an external force is applied in the left-right direction, this external force is absorbed by the diaphragm spring within this range of displacement.

FIG. 4 is a side view of the diaphragm spring in a deformed state.

Even if the fixed frame 10 is twisted and the vertical bolt 14 is inclined relative to the base plate 16, the diaphragm springs 21 and 22 are deformed by the spring action of the diaphragm parts 21b and 22b and absorb the torsional force.
Almost no stress is applied to the base plate 16 due to this twisting.

Therefore, while taking advantage of the shock mount having a large spring constant, it is possible to prevent stress and strain from being applied to the base plate.

Another feature is that it can be easily constructed by combining it with commercially available shock mounts.

Furthermore, by adjusting the tightening force of the nut, the stress transmitted to the base plate can be adjusted.

In the above embodiments, the diaphragm spring and the nut are provided separately, but it is also possible to integrate them into a diaphragm spring nut.

As described above, the shock mount fixing structure of this invention has a simple structure that can significantly reduce the stress and strain transmitted to the base plate even when using a shock mount with a large spring constant. be effective.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the operation when using a conventional shock mount fixing structure, Fig. 2 is a sectional view of an embodiment of the shock mount fixing structure according to this invention, and Fig. 3 is a plane view of the diaphragm spring. 4 are side views of the diaphragm spring in a deformed state. 10... Fixed frame, 13... Shock mount, 14... Vertical bolt, 16...
...Base plate, 17...Precision equipment,
18...Through hole, 19.20...Receiving groove, 21, 22...Diaphragm spring, 2
1av22a...Open end, 21b. 22b...Diaphragm part, 23゜24...Nut.

Claims (1)

[Scope of utility model registration request] A device is attached to a fixed frame, a shock mount having a vertical bolt attached to the fixed frame, a through hole having a diameter larger than the vertical bolt, and a receiving groove formed on the surface concentrically with the through hole. base plate and
The diaphragm spring includes a bowl-shaped diaphragm spring having a center hole into which the vertical bolt is inserted, and a nut that is screwed into the vertical bolt. A shock mount fixing structure in which the open end is inserted into the receiving groove, the nut is screwed onto a vertical bolt, and a diaphragm spring is held between the nut and the base plate.