JPH022109Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration isolating device, and more particularly to a device that can prevent vibration by being stretched by a stay shaft.

As a conventional vibration isolator of this type, there is one shown in FIG. 1, in which a vibration isolating stay mechanism S is interposed between a main ship engine (diesel engine) 8 and a hull 7. , this stay mechanism S includes a stay shaft 1, an adjustment screw 2, a lock nut 3, and a rotation stopper plate 4.
and support seats 5 and 6.

To install the stay mechanism S, tighten the adjustment screw 2 until the stay 1 receives a certain compression force, so that the stay 1 is stretched between the main engine 8 and the hull 7. All you have to do is make it .

However, in such a conventional vibration isolator, when the hull 7 as a supporting structure is deflected, the load applied to the stay shaft 1 changes, and the tension of the stay shaft 1 is adjusted each time with the adjustment screw 2. However, there is a problem in that maintenance is time-consuming.

There is also the problem that if excessive force is applied to the stay shaft 1, the main engine 8 and the hull 7 may be damaged.

The present invention aims to solve these problems and provides a vibration isolator that is maintenance-free and eliminates the need to adjust the tensile force of the stay shaft even when the load applied to the stay shaft changes. The purpose is to

Therefore, the vibration isolator of the present invention includes a cylinder and a support seat attached to one and the other of a vibrating object and a support structure, a piston fitted into the cylinder, and a female threaded portion of the support seat. The piston has an adjusting screw which is screwed together with a lock nut, and a stay shaft whose one end is fitted and supported in a recess on the outer end surface of the adjustment screw and the other end is fitted and supported in a recess on the outer end surface of the piston. It is characterized in that a spring is loaded between the piston and cylinder to generate tension.

Hereinafter, a vibration isolating device as an embodiment of the present invention will be explained with reference to the drawings. FIG. 2 is a sectional view showing its arrangement, and FIG. 3 is a graph for explaining its operation.

As shown in FIG. 2, a vibration isolation stay mechanism S' is interposed between a main marine engine (diesel engine) 8 as a vibrating object and a ship body 7 as a support structure.

This stay mechanism S' includes a stay shaft 1, one end of which is fitted into and supported by a recess on the outer end surface of an adjustment screw 2, and the other end of the stay shaft 1 is fitted into a recess on the outer end surface of a piston 10. Supported by inset.

The adjustment screw 2 is screwed into a support seat 5 fixed to the hull 7, and can be adjusted so as to be freely inserted into the support seat 5.

Note that the adjustment screw 2 is fixed by a lock nut and a rotation stopper plate 4.

Further, the piston 10 has a diameter-reduced piston portion fitted into a cylinder 9 fixed to the main engine 8, so that it can freely enter into the cylinder 9, and furthermore, there is a space between the piston 10 and the cylinder 9. teeth,
Several disc springs 1 having characteristics as shown in Fig. 3
1 is interposed.

Furthermore, a scale 12a is provided on the circumferential surface of the enlarged diameter portion near the outer end surface of the piston 1.
An indicator 12 pointing to a is fixed to the cylinder 9 side. Therefore, by reading the scale 12a indicated by the indicator 12, the disc spring 1
The degree of contraction of 1 can be known.

With the above configuration, in order to install the stay mechanism S' between the main engine 8 and the hull 7, first loosen the lock nut 3 with the support seat 5 fixed to the hull 7 side, and then tighten the adjustment screw 2 onto the support seat 5. Screw it inside.
Next, the piston 10 is inserted into the cylinder 9 fixed to the main engine 8 side. At this time, a predetermined number of disc springs 11 are interposed between the cylinder 9 and the piston 10. Then, the indicator 12 is attached.

After doing this, the adjustment screw 2 is turned so as to protrude from the support seat 5, and the stay shaft 1 is pushed to generate a tensile force in the stay shaft 1.

At this time, the scale 12a indicated by the indicator 12
Adjust the thrust tension while watching. When the desired tensile force is obtained, the lock nut 3 is tightened and fixed.

By setting the stay mechanism S' in this way, the main engine 8 and the hull 7 can be connected in a tensioned state by the stay shaft 1 and the elasticity of the disc spring 11, and the engine vibration can be sufficiently suppressed. This can be prevented.

By the way, even if the hull 7 or the main engine 8 is deflected, the deflection can be absorbed by the disk spring 11, so the tension of the stay shaft 1 can be adjusted every time deflection occurs, as in the conventional device. This eliminates the need for maintenance, making it maintenance-free.

Further, since excessive force is not generated on the stay shaft 1, the main engine 8 and the hull 7 are not damaged.

Furthermore, the scale 12 indicated by the indicator 12
By visually reading a, the stay shaft 1
It is also possible to easily and reliably adjust the tension.

Note that the support seat 5 may be fixed to the main engine 8 side, and the cylinder 9 may be fixed to the hull 7 side.

Further, the present device can be applied not only to internal combustion engine vibration isolators for ships and land, but also to vibration isolators for other vibrating structures.

Furthermore, instead of the disc spring 11, a plate spring or a coil spring can be used.

As detailed above, the vibration isolator of the present invention includes a cylinder and a support seat respectively attached to one and the other of a vibrating object and a support structure, and a piston fitted into the cylinder. An adjusting screw that is screwed together with a lock nut into the female threaded portion of the support seat, and a stay shaft having one end fitted and supported in a recess on the outer end surface of the adjustment screw and the other end fitted and supported in the recess on the outer end surface of the piston. With a simple structure in which a spring is loaded between the piston and the cylinder to generate tension on the stay shaft, the following effects and advantages can be obtained.

(1) Even if the vibrating object or support structure is bent, the spring attached to the end of the stay shaft can absorb the deflection, so there is no need to adjust the tension of the stay shaft, making it maintenance-free. can be realized.

(2) Since excessive force is not applied to the stay shaft, there is no possibility of damaging vibrating objects or supporting structures.

(3) At the time of initial adjustment of this device, by operating the adjustment screw, it is possible to easily apply a tensile force to the stay shaft while generating a biasing force in the spring.

(4) During the initial adjustment described in item (3) above, as the spring generates a biasing force against the stay shaft, the piston that engages with the stay shaft is guided by the cylinder and retracts, and in this way, the stay shaft The tensile force is generated smoothly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the arrangement of a conventional vibration isolator, and Figs. 2 and 3 show a vibration isolator as an embodiment of the present invention. FIG. 3 is a graph for explaining the effect. 1... Stay shaft, 2... Adjustment screw, 3... Lock nut, 4... Rotation stop plate, 5... Support seat, 7
... Hull as a support structure, 8 ... Marine main engine as a vibrating object, 9 ... Cylinder, 10 ... Piston, 11 ... Belleville spring, 12 ... Indicator, 12a ... Scale, S' ... Anti-vibration stay mechanism.

Claims (1)

[Scope of utility model registration request] A cylinder and a support seat respectively attached to one and the other of the vibrating object and the support structure; a piston fitted into the cylinder; and an adjustment screw screwed together with a lock nut into the female threaded portion of the support seat; A stay shaft is provided, one end of which is fitted and supported in a recess on the outer end surface of the adjustment screw, and the other end is fitted and supported in a recess on the outer end surface of the piston. A vibration isolating device characterized by a spring loaded between the parts.