JPH0212292B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a vibration damping device that reduces vibrations generated in the hull of a ship powered by an internal combustion engine, etc.
This invention relates to a rotary vibration damping device that operates with a minimum amount of energy by making the vibration force variable.

Background Art Today's ships often use reciprocating internal combustion engines such as diesel engines as power sources.
BACKGROUND ART How to reduce engine-generated vibrations, especially ship body vibrations that resonate with the engine vibrations, is a major problem in achieving comfortable running performance of ships.

As a vibration damping method to reduce this hull vibration,
There is a way to reduce the vibrations generated by the engine by installing a counterbalancer that rotates in the opposite direction to the crankshaft on the engine itself, but for example, installing such a device on an internal combustion engine for a large ship will increase the size of the engine. The price has skyrocketed and it is not common.

In addition, a vibration damping device has been proposed that is installed on a ship's hull and applies vibration whose phase is adjusted to the vibration frequency of the ship's hull to reduce hull vibration. Specifically, a pair of rotating bodies each having a weight attached thereto are rotated in opposite directions by an electric motor, thereby canceling the horizontal vibration caused by the weight and generating vertical vibration. Although this device has the advantage of simple construction, the excitation force cannot be changed during operation of the device. In other words, when the hull vibration changes, or depending on the type of hull vibration, it is necessary to change the excitation force, but the above-mentioned electric vibration damping device generates vibration from the weight of the rotating body, so it is necessary to stop operation. The weight must be replaced with a weight of the required weight, and the weight of the weight can only be changed in stages. In addition, since an electric motor is used to drive the rotating body, a large amount of electric power is required to start the rotating body, and a method is usually used to induce rotation by rocking the rotating body at the time of starting. Rotation speed control is necessary to adjust the vibration period and obtain the optimal excitation mode.
Therefore, there was a problem in that an electromagnetic brake, an electromagnetic coupling, and an expensive electric control device for controlling these were indispensable.

Purpose of the Invention In view of the current state of rotary vibration damping devices that are installed on a ship's hull to reduce ship vibration, the present invention provides a system that can freely change the vibration frequency and excitation force applied to the ship's hull during operation. The object of the present invention is to provide a vibration damping device that can be operated with low energy consumption without consuming a large amount of energy to obtain vibration force, and further aims to provide a rotary vibration damping device that is simple in structure, easy to operate, and inexpensive.

DISCLOSURE OF THE INVENTION A rotary vibration damping device that generates vibration in a vertical direction by mutually rotating a pair of rotary bodies having weights in opposite directions, including a rotary support part in which each rotary body is pivotally supported on a rotating shaft;
It is divided into two parts, including an unbalanced weight part that is movable in the radial direction of rotation, and a cylinder hole is provided in one of the two parts.
The piston and piston rod, which are slidably fitted into this cylinder, are fixed to the other of the two members to connect them, and the position of the unbalanced weight can be moved and fixed in the diametrical direction of the rotating shaft using pressure oil supplied into the cylinder. A rotating body characterized in that, when the unbalanced weight part is in close contact with the rotating support part and integrally fixed thereto, it forms a cubic-shaped rotating body whose center of gravity is located at the center of the rotating shaft. This is an excitation type vibration damping device.

In the rotary excitation type vibration damping device according to the present invention, a rotating body, such as a cube, whose center of gravity is at the center of the rotation axis is divided into two parts, and one member acts as an eccentric weight to adjust the position in one radial direction of the rotation axis. The center of gravity of the eccentric weight is variable and the excitation force can be set freely.When the rotating body is started, it can be integrated into the cube mentioned above, so a large driving torque is not required, and when starting It has the advantage of excellent rotation start-up performance and good responsiveness. Further, the structure of the two-split rotating body is simple and has excellent controllability because a hydraulic cylinder is formed and connected between the split members, and is cheaper than an electric control device.

An example of the configuration of a rotating body will be described below based on the drawings. 1 and 2 are explanatory diagrams of a rotating body according to the present invention, and FIG. 2 is an explanatory diagram when an unbalanced weight portion of the rotating body in FIG. 1 is moved. FIG. 3 is a circuit diagram of the pilot check valve.

The rotating body 1 consists of a rotating support part 3 that is pivotally supported by a rotating shaft 2 and a movable biased weight part 4. The weight portion 4 fits together to form a cube.

A pair of cylinder holes 5 and 5' are bored in the unbalanced weight part 4 through the rotating shaft 2, and the hole into which the piston 6 and the integrated piston rod 7 fitted into one cylinder hole 5 is the cylinder hole. A hole is drilled following 5, and a hole is also drilled in the rotation support part 3, and the piston rod 7 penetrates the surface of the rotation support part 3, and a nut 8 is screwed into the threaded part at the end to fix it. In addition, a hole into which the rod 31 integrated with the slide 30 fitted into the other cylinder hole 5' is inserted is drilled following the cylinder hole 5', and a hole is also drilled in the rotation support part 3, and the rod 31 is inserted into the cylinder hole 5'. penetrates the surface of the rotary support portion 3, and a nut 8' is screwed into the threaded portion at the end thereof to be fixed thereto. Therefore, with respect to the rotation support part 3 fixed to the rotation shaft 2, the unbalanced weight part 4 is connected to the piston 6 and piston rod 7 that fit into the cylinder hole 5, and the slide 30 and rod 31 that fit into the cylinder hole 5'. They are connected so that they can move in one diameter direction.

The piston 6 and the piston rod 7 are provided with two through-oil passages c and d for supplying pressure oil to both sides of the piston 6 in the cylinder hole 5, and a pilot check valve 9 fixed to the surface of the rotation support 3 is provided. oil road
They are connected by A ₂ and B ₂ , and the pressure oil is passed through the rotating shaft 2 and connected to, for example, the rotary coupler and the oil passage.
The oil is supplied to the pilot check valve 9 via A ₁ and B ₁ and into the cylinder hole 5 through oil passages A ₂ and B ₂ and through oil passages c and d.

When pressure oil is supplied to the piston rod 7 side of the cylinder hole 5, the unbalanced weight part 4 comes into close contact with the rotation support part 3, forming a cubic rotating body 1. On the other hand, the oil road
When pressure oil is introduced into _A1 , the pressure oil passes through check valve 91.
At the same time, the check valve 92 is also pushed up through the pilot oil passage, and at the same time, the pressure oil on the piston rod 7 side is supplied to the tip side of the piston 6 in the cylinder hole 5 through the oil passages A 2 _and c.
The oil is discharged through B ₂ and B ₁ into the oil tank, and the unbalanced weight portion 4 is in an extended state. After that, oil path A ₁ ,
Even if the pressure oil in _B1 is reduced to zero, the unbalanced weight maintains its current state. Therefore, the pressure oil lock of the pilot check valve 9 allows the locking position of the unbalanced weight portion 4 to be freely selected, and the center of gravity of the rotating body 1 to be arbitrarily set. You can change your power freely.

Although the drawing shows a case in which only one piston 6 is hydraulically actuated, any structure may be used as long as the structure of the two-split rotating body forms a hydraulically actuated cylinder between the split members and connects them. , may be appropriately selected based on the shape and dimensions of the rotating body.

Excitation force in the vertical direction can be obtained by rotating the pair of rotating bodies configured as described above in opposite directions, and the excitation force can be freely set by controlling the position of the eccentric weight section.

Embodiment An embodiment of the rotary vibration damping device according to the present invention will be described below. FIG. 4 is a hydraulic circuit diagram of the embodiment.

The entire device is placed on a pedestal 10, and this pedestal 1
0 is fixed to a vibrating location such as a ship's hull.

In the rotary vibration damping device according to the present invention, a pair of rotating bodies 1 having the above-mentioned configuration are mounted on rotating shafts 2, 2 each having both ends supported by bearings 11. It has a configuration in which a pair of meshing gears 12 and 13 rotate in opposite directions, and is driven by a hydraulic motor 14 connected to one rotating shaft 2.

The hydraulic motor 14 is connected to a variable discharge pump 17 through hydraulic pipes 15 and 16 to form a closed circuit and is driven. Between the hydraulic pipes 15 and 16,
In a closed circuit hydraulic drive system, general brake relief valves 18, 19, negative pressure prevention check valve 20,
21, a boost pump 22 and a boost pressure setting relief valve 23 are connected, and furthermore, an oil tank 24, a suction filter 25 and an electric motor 2.
6 is attached, which is a hydraulic motor drive circuit with excellent responsiveness and efficiency.

The structure in which pressure oil is supplied to the pilot check valve 9 attached to the rotary body 1 is such that a hydraulic pump supplies the inside of the shaft with rotary couplings 27, 27 connected to the ends of the rotary shaft 2 via solenoid valves 28, 29. The lock position of the eccentric weight portion 4 of the rotating body 1 can be arbitrarily set and controlled by adjusting the solenoid valve.

First, when the rotating body 1 is started, pressure oil is supplied to the piston rod 7 side of the cylinder hole 5, and the unbalanced weight part 4 comes into close contact with the rotating support part 3, forming an integral rotating cube, so that the center of gravity of the rotating body 1 is coincides with the rotation axis 2, the minimum starting torque is required, and steady rotation can be achieved quickly. Next, by introducing pressure oil into the tip side of the piston 6 in the cylinder hole 5 and removing the pressure oil from the piston rod 7 side, the unbalanced weight part 4 moves outward, and vibration is generated by the rotation of the unbalanced weight part 4. You can gain strength. Here, as the unbalanced weight portion 4 of the rotating body 1 moves during rotation, the moment of inertia increases and the rotation speed decreases.
This can be easily dealt with by controlling the drive system of the hydraulic motor 14, and operates as a damping device for any excitation force controlled by the solenoid valves 28 and 29.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a rotating body according to the present invention, and FIG. 2 is an explanatory diagram when an unbalanced weight portion of the rotating body in FIG. 1 is moved. FIG. 3 is a hydraulic circuit diagram of a pilot check valve, and FIG. 4 is a hydraulic circuit diagram of a rotary vibration damping device according to the present invention. In the figure, 1... Rotating body, 2... Rotating shaft, 3... Rotating support part, 4... Unbalanced weight part, 5, 5'... Cylinder hole, 6... Piston, 7... Piston rod,
8, 8'... Nut, 9... Pilot check valve, 10... Pedestal, 11... Bearing, 12, 13...
... Gear, 14 ... Hydraulic motor, 15, 16 ... Hydraulic piping, 17 ... Variable discharge pump, 18, 19,
23... Relief valve, 20, 21... Check valve, 22... Boost pump, 24... Oil tank, 25... Suction filter, 26... Electric motor, 27... Rotary coupling, 28, 2
9... Solenoid valve, 30... Slide, 31...
...Rotsud.

Claims (1)

[Claims] 1. In a rotary excitation type vibration damping device that generates vibration in the vertical direction by rotating a pair of rotary bodies having weights in opposite directions, each rotary body has a rotary support part supported by a rotary shaft, and a rotation radius. It is divided into two parts, including an unbalanced weight part that is movable in one direction, and a cylinder hole is provided in one of the two parts, and a piston and a piston rod that are slidably fitted into this cylinder are fixed to the other part of the two parts to connect them. It has a configuration in which the position of the unbalanced weight can be moved and fixed in the diametrical direction of the rotating shaft using pressure oil supplied into the cylinder, and when the unbalanced weight part is closely fixed to the rotation support part and fixed integrally. A rotary vibration damping device characterized in that it forms a cube-shaped rotating body whose center of gravity is located at the center of a rotation axis.