JPS6127328A - Vibration insulation supporter - Google Patents

Abstract

PURPOSE:To prevent impact vibration from being produced by installing an internal combustion engine on an engine base via main vibration insulation rubber hydraulically operated on the engine base and operating the sub-vibration insulation rubber when vibration displacement of the internal combustion engine becomes greater than a set value. CONSTITUTION:An internal combustion engine 1 is installed on an engine base 5 via a vibration insulation device composed of main vibration insulation rubber 12 and sub-insulation rubber 16. The main vibration insulation rubber usually connects the engine base with the engine, while the sub-vibration insulation rubber 16 holds a fixed part 18 of the engine with the rubber thereof by making use of hydraulc actuators 9, 11 when the displacement of the vibration exceeds a set value. The displacement of the vibration is detected by displacement detectors 7a, 7b provided in the internal combustion engine 1 for operating the actuators 9, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration isolation support device used when installing equipment such as an internal combustion engine to a frame such as a ship's hull.

[Conventional technology]

A previous example of a vibration isolating support device for an internal combustion engine for ship propulsion is shown in Part 5.
As shown in FIG.

In the figure, a is an internal combustion engine, and b is a reduction gear.

C is a high-elastic shaft joint, d is a vibration-proof rubber, and e is an engine stand.

In order to reduce the force transmitted to the engine stand e by the excitation force generated from the engine a in such a vibration isolating support device, the frequency ω of the excitation force of the engine a and the vibration isolating support Then, the spring constant of the anti-vibration rubber d is selected so that the ratio with the natural frequency ω0 of the entire device satisfies the relationship ω/ωo>JT. In a marine main engine, the engine speed ranges from the rated speed to the idling speed, so the frequency ω of the excitation force is also low, so the natural frequency ω0 of the entire system must be made sufficiently low relative to these. , the spring constant of the anti-vibration support is extremely low.

On the other hand, if the support spring constant of the above-mentioned vibration isolation is low, the starting of one engine,
This is because the displacement of engine 1 a becomes excessive when the engine is stopped, idling, or when the ship shakes due to waves during navigation, which adversely affects the durability of the piping between the engine and the ship, the high-elastic shaft couplings, etc.

Conventionally, a stopper was provided to suppress displacement beyond the allowable range.

[Problem that the invention seeks to solve]

Conventional engines were equipped with a stopper as mentioned above, so if the engine swings and hits the stopper during operation,
The resulting shock vibrations and engine vibrations are transmitted to the hull via the engine stand, resulting in a problem in that the required vibration-proofing effect cannot be obtained.

The present invention was developed in view of the above, and it maintains the required spring constant when one device is in operation and exhibits a sufficient vibration damping effect, and prevents the occurrence of impact vibration when a large displacement occurs in the eight devices. The purpose of the present invention is to provide an anti-vibration support device.

[Failure to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a sub-vibration isolating rubber in parallel with the main anti-vibration rubber interposed between the device and the frame, and uses an actuator to move the sub-vibration isolator to the lashing part of the device. The actuator is configured such that the actuator can be pressed against or separated from the actuator, and a displacement detection signal is input to a control device to operate the actuator.

[Effect]

Since the present invention has the above configuration, when a large displacement occurs in the 9 devices, the control device receives the displacement detection signal and operates the actuator to press the secondary vibration isolator and the lashing part to press both the main and secondary Vibration is suppressed with anti-vibration rubber. However, the pressure between the secondary anti-vibration rubber and the securing part can be adjusted by the control device, and if the pressure is maximized, the device will be secured to the pedestal.

It is also possible to set

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In FIG. 1, 1 is an internal combustion engine, 2 is a reduction gear, 3 is a high-elastic shaft coupling, 4 is a vibration isolator, and 5 is an engine. stand, 6
is a rotation detector that detects the rotation speed of the engine 1, 7a,
7b is a displacement detector for detecting displacement in the axial direction of the engine 108;
8 is a control device, 9 is a solenoid valve control device, 10 is an oil pump,
11 is a solenoid valve. The solenoid valve control device 9 and the solenoid valve 11 constitute an actuator.

・Figure 3 shows details of the vibration isolator 4, and in Figure 1,
13 is an upper bladder fixed to engine 1 with bolts 21;
), 14 is a lower bracket fixed to the engine stand 5 with bolts 22, and 12 is a lower bracket whose both ends are connected to the upper bracket 13.
and main vibration isolating rubber fixed to the lower bracket 14, respectively.

A pair of cylinders 23 are formed in the lower bracket 14, and a hydraulic piston 15 is slidably fitted into the cylinders 23. The pair of pistons 15 are formed with protrusions 17 facing each other, and a sub-vibration isolator 16 having an inverted conical recess is fixedly inserted into the protrusion 17. A lashing part 18 protruding from the papermaking upper bracket 13 can be compressed.

Pressure oil is supplied into each cylinder 23 through an oil inlet 19 and an oil passage 24.

As shown in FIG. 2, the control device 8 includes a rotation detector 6.
The signal of the engine rotation speed detected by and each displacement detector 7a
, 7b, and when the control device 8 receives the detection signal and the detected displacement exceeds a certain value, when the engine 1 is idling.

It is configured to send an operation signal for the solenoid valve 11 to the solenoid valve control device 9 when the engine 1 is started or stopped.

In the above device, in a normal operating state where the two engine speeds are equal to or higher than the idling speed, the two engines 1 are supported by the engine stand 5 via the main vibration isolator 12'f, and the sub vibration isolator 16 is connected to the lashing section 18. There is a distance between them. The spring constant of the main anti-vibration rubber 12 is set to a low value so as to exhibit a sufficient anti-vibration effect against the vibration frequency of the engine. In such an operating state, if a large displacement occurs in engine 9 1 due to hull rocking or the like, this displacement will be detected by displacement detector 7a.

7b and input to the control circuit 8.

The control device 8 sends an operation signal for the electromagnetic valve 11 to the electromagnetic valve control device 9 when the detected displacement value input thereto exceeds a preset allowable value. The solenoid valve control device 9 increases the opening degree of the solenoid valve 11 to a value corresponding to the operation signal from the control device 8. Therefore hydraulic pump 1
The oil pressure of the pressure oil force-fed to each cylinder 23 is increased from 0. This oil pressure passes through the oil inlet 19 and the oil passage 24, and the hydraulic pistons 1 are placed opposite each other on the left and right with the securing part 18 in between.
5 and press the inverted cone-shaped vibration isolating rubber 16 against the lashing part 18. This securing portion 8 is fixed to the engine 1 side and vibrates together with the engine 1.

On the other hand, the hydraulic piston 15 rises in the pressure oil and is fixed integrally with the engine stand 5 side. The inverted conical sub-vibration rubber 16 is pressed against the lashing part 18 with a pressing force corresponding to the above-mentioned oil pressure, and the annular contact area changes as the rubber part elastically deforms. The spring constant of the entire vibration isolating device 4 is the spring constant of the inverted cone-shaped sub vibration isolating rubber 16 added to the main vibration isolating rubber 12.

The shear spring constant of the sub-vibration isolating rubber 16 has a property of increasing as the annular contact area increases.

By changing the oil pressure, the spring constant of the vibration isolator can be changed. However, if the oil pressure is made sufficiently high, the protruding part 17 of the hydraulic piston 15 will directly clamp the securing part 18, and the engine 1 can be completely fixed to the engine stand 5.

Therefore, the vibration isolating device 4 can prevent large displacements of the engine 1 due to ship body rocking or the like by temporarily increasing the spring constant of the device.

Further, when the engine 10 is started or stopped, the control device 8 receives a detection signal from the two-rotation detector 6 and sends an operation signal for a large solenoid valve opening to the solenoid valve control device 9.

The opening degree of the solenoid valve 11 is increased. This increases the oil pressure to the cylinder 23 and 7. The hydraulic piston 15 is pressed against the locking portion 18, and the engine 1 is fixed to the engine stand 5.

〔Effect of the invention〕

The present invention is constructed as described above, and according to the present invention, during normal operation of a single piece of equipment, it is possible to support the piece of equipment with a spring constant that is most suitable for the vibration-proof support conditions of the piece of equipment, and to prevent large displacements of the equipment. In contrast, vibration can be suppressed by increasing the spring constant of the vibration isolator in accordance with the detected displacement value, without generating shock vibrations due to the collision of stoppers as in conventional devices.

Furthermore, this vibration isolator can also serve as a lashing device for one equipment body.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of the present invention, where Figure 1 is an overall external view, Figure 2 is a detailed sectional view of the vibration isolator, and Figure 4 is a view in the direction of the ■ arrow in Figure 3. be. 5 and 6 are a front external view and a side external view showing an example of a conventional vibration isolator for a marine internal combustion engine. 1... Internal combustion engine, 4... Vibration isolator, 5... Engine stand. 6... Rotation detector, 7a, 7b... Displacement detector, 8... Control device, 9. Solenoid valve control device, 11... Solenoid valve. 12... Main anti-vibration rubber, 15... Hydraulic piston, 16...
...Secondary anti-vibration rubber. Figure 1: 3: 4 yen 5: 6 countries

Claims (1)

[Claims] In a device that supports a device such as an internal combustion engine on the pedestal via a main vibration isolating rubber interposed between the device and the pedestal, the device is arranged in parallel with the main vibration isolating rubber between the device and the pedestal. a sub-vibration isolating rubber whose one end is connectable to and detachable from the lashing part of the device and whose other end is connected to the mount; A vibration-proof support device comprising: an actuator provided thereto; a detector that detects displacement of the device; and a control device that outputs a control signal to the actuator in accordance with a detection signal from the detector. .