JPH0232911Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is installed at the end of the crankshaft in marine main engines, power generation engines, etc., and is used to avoid or attenuate torsional vibration of the crankshaft. The present invention relates to a torsional vibration suppression device that protects a system.

"Prior Art" Conventionally, there have been three main types of torsional vibration suppression devices of this type: a metal spring type, a rubber type, and a viscous fluid type. Since it is easy to change the amount of vibration damping, those that effectively utilize damping by lubricating oil are often used. 4 to 6 show a metal spring type torsional vibration suppressing device using this lubricating oil. In the figures, 1 is a substrate having a flywheel effect as an outer ring mass part. A plurality of grooves 2 are provided at predetermined intervals on the outer peripheral surface of the inner surface of the base plate 1, and the inner surface is connected to a flange portion 3a at the front end of the crankshaft 3 of the engine. A star 4 is rotatably and liquid-tightly provided with respect to the substrate 1, and
A plurality of intermediate pieces 5 are radially fixed to the outer side of the inner surface of the substrate 1 via bolts 6, and a plurality of leaf springs are bundled in each accommodation space S between the intermediate pieces 5. The tips of each spring block 7 are inserted into each groove 2 of the inner star 4, and the base plate is held and fitted into the adjacent intermediate piece 5. Each of the accommodation spaces S is divided into one first oil chamber 8a located in the counterclockwise direction in FIG. 4, and each second oil chamber 8b located in the clockwise direction in FIG. has been done. Further, an annular side plate 9 is fixedly attached to the inner surfaces of the intermediate piece 5 and the spring block 7 by the bolts 6 passing through the intermediate piece 5, and is attached to the outer periphery of the intermediate piece 5 and the spring block 7. A tightening ring 11 is fitted onto the surface via a tapered ring 10, and narrow communication grooves P are formed in the substrate 1 and side plate 9 to allow adjacent accommodation spaces S to communicate with each other. has been done.

In the above-mentioned torsional vibration suppressing device, the rotation of the inner star 4 is transmitted to the outer ring side via the spring block 7, and when torque fluctuation etc. occur during rotation transmission, the inner star 4 is transmitted to each spring block 7.
For example, as shown in FIG. 6, press and bend the inner star 4 in the circumferential direction, and
The oil chamber 8a is narrowed and each second oil chamber 8b is expanded. Therefore, at the same time as the pressure in each first oil chamber 8a increases, the pressure in each second oil chamber 8b decreases, and the lubricating oil in each first oil chamber 8a passes through each communication groove P and reacts as shown in FIG. Each second oil chamber 8b of each adjacent storage space S in the clockwise direction flows into each second oil chamber 8b, and at that time, each communication groove P
The torsional vibrations are damped by the viscous resistance of the lubricating oil flowing through the spring blocks 7 when each spring block 7 bends.

"Problems to be solved by the invention" By the way, in the conventional torsional vibration suppressing device described above, the spring constant of each spring block 7 and each communication groove P are
The damping performance of torsional vibration can be adjusted by changing the dimensions of Since the lubricating oil has a low viscosity and a high viscosity, the viscous resistance of the lubricating oil when passing through the communication groove P increases significantly, resulting in a problem of excessive damping. Therefore, in the past, the communication groove was
Setting the dimensions, shape, etc. of
However, in reality, there have been cases in which it has not been possible to deal with the problem only by adjusting the communication groove P.

This invention was made in view of the above circumstances,
It is an object of the present invention to provide a torsional vibration suppressing device whose vibration damping performance does not change significantly even if the temperature of lubricating oil changes.

"Means for Solving the Problems" In order to achieve the above object, the present invention includes a substrate in which a plurality of intermediate pieces are provided radially, and a plurality of grooves connected to lubricating oil injection holes on the outer peripheral surface. inner stars provided at predetermined intervals in the center of the substrate so as to be rotatable and liquid-tight with respect to the substrate;
The tip end is inserted into each groove of this inner star and fitted into each accommodation space between the intermediate pieces, and each accommodation space is divided into each first oil chamber on one side and each second oil chamber on the other side. a plurality of spring blocks, and a link and a side plate that entirely cover the intermediate piece and the spring block and are fluid-tightly attached between the base plate and the inner star, and at least one of the base plate, the side plate and the intermediate piece. , a torsional vibration suppressing device comprising a communication groove that communicates each housing space of each of the spring blocks with each other, and configured to elastically transmit rotation of either the substrate or the inner star to the other. In at least one of the substrate, the side plate, and the intermediate piece,
A first flow path communicating with each first oil chamber of each housing space of each spring block and a second flow path communicating with each second oil chamber
a flow path, and the first flow path and the second flow path
Each flow path is provided with a pressure regulating valve that adjusts the pressure of the lubricating oil.

"Function" In the torsional vibration suppression device of the present invention, when the viscosity of the lubricating oil is high and the viscous resistance of the lubricating oil in the communication groove is excessive, such as when starting the engine, the inside of the first oil chamber and the second oil chamber When the pressure in one of the oil chambers increases, the pressure also increases in the flow path communicating with the oil chamber where the pressure has increased. Then, a pressure regulating valve provided in this flow path operates to reduce the pressure, thereby preventing excessive damping due to the lubricating oil.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Note that the same reference numerals are given to the parts having the same basic structure as those of the conventional example, and the explanation thereof will be omitted.

In the figure, reference numeral 12 denotes a plurality of through holes that penetrate the substrate 1 in its thickness direction, and one end of each through hole 12 opens into each first oil chamber 8a of each accommodation space S, and each other. The ends each open into a shallow annular groove 13a formed along the circumferential direction on the outer periphery of the substrate 1. Reference numeral 14 denotes a plurality of through holes passing through the side plate 9 in its thickness direction, and one end of each through hole 14 opens into each second oil chamber 8b of each accommodation space S, and each other. The ends each open into a shallow annular groove 15a formed along the circumferential direction on the outer surface of the side plate 9.

Furthermore, an annular mounting plate 16 is fixedly attached to the outer surface of the board 1 by bolts 6 that interconnect the board 1, side plate 9, and intermediate piece 5. An annular groove 13b is formed on the inner surface, which is combined with the annular groove 13a of the substrate 1 to form an annular channel 13 having a large cross-sectional area.
2 constitutes a first flow passage 17 that communicates with each first oil chamber 8a. A mounting hole 18 is provided at a predetermined position of the mounting plate 16, with one end opening in the annular groove 13b and the other end opening in the outer surface of the mounting plate 16, and a female threaded portion formed on the inner surface. A first pressure regulating valve 19 for regulating the pressure of lubricating oil is screwed into this mounting hole 18 .

On the other hand, the mounting plate 16 is also provided on the outer surface of the side plate 9.
Similarly, an annular mounting plate 20 having an annular groove 15b that is combined with the annular groove 15a to form an annular flow path 15 is fixedly attached with bolts 6, and the annular flow path 15 and the through hole are connected to each other. The hole 14 constitutes a second flow path 21 that communicates with each second oil chamber 8b. The mounting plate 20 is also provided with a mounting hole 22 similar to the mounting hole 18, and a second pressure regulating valve 23 is screwed into this mounting hole 22.

Further, as shown in FIG. 3, the first and second pressure regulating valves 19 and 23 each have a male threaded portion 24a on the outer circumferential surface of the distal end side, which is screwed into the mounting holes 18 and 22.
Inside the valve body 24 in which a hollow portion 25 is formed, one end opens to the distal end face of the valve body 24 through an inflow passage 25a, and the other end opens to the proximal end face of the valve body 24 through a female threaded portion 25b. is provided inside the hollow portion 25, and the inflow path 25 is in contact with a substantially tapered valve seat portion 25c at the boundary between the hollow portion 25 and the inflow path 25a.
A ball 26 for opening and closing a is inserted into the receiving member 27 in a substantially held state, and a threaded member 28 having a relief passage 28a that communicates the hollow portion 25 with the outside is screwed into the female threaded portion 25b. worn,
A spring 29 is interposed between the screw member 28 and the receiving member 27 to press the receiving member 27 and the ball 26 against the valve seat portion 25c. And the first oil chamber 8a
Alternatively, when the pressure within the second oil chamber 8b increases, the pressure is reduced by the first pressure regulating valve 19 or the second pressure regulating valve 23.

The torsional vibration suppressing device having the above structure is used by connecting the inner star 4 to the front end flange portion 3a of the crankshaft 3 and injecting lubricating oil into the device from the injection hole 2a, as shown in FIG. Additionally, the inner star 4 can be used by being connected to the crankshaft 3 and the main engine front output take-out shaft 30. When torque fluctuation occurs during the rotation of the crank 3 and the take-out shaft 30, the inner star 4 presses and bends each spring block 7, for example, in the clockwise direction in FIG. 1, thereby narrowing each first oil chamber 8a. Expand each second oil chamber 8b. Therefore, the pressure in each first oil chamber 8a becomes higher than the pressure in each second oil chamber 8b, and the lubricating oil in each first oil chamber 8a passes through each communication groove P to the first oil chamber 8b.
The lubricating oil flows into each of the adjacent second oil chambers 8b in the clockwise direction in the figure, and torsional vibration is attenuated by the viscous resistance of the lubricating oil at that time and the resistance when each spring block 7 bends. However, when the temperature of the lubricating oil is low, such as when starting the engine, the viscosity increases and the viscous resistance of the lubricating oil passing through each communication groove P increases. There is a risk that the pressure will increase abnormally, resulting in excessive damping. However, in the above device, when the pressure in each first oil chamber 8a exceeds a predetermined setting value, the lubricating oil flows to the first pressure regulating valve 1.
The ball 26 of No. 9 is pushed in against the biasing force of the spring 29 to be removed from the valve seat portion 25c. Then, the lubricating oil enters the hollow part 25 from the first flow path 17 via the inflow path 25a and flows out from the relief path 28a, and when the pressure in each first oil chamber 8a falls below the set value, the ball 26 releases the spring. The inflow passage 25a is closed again by being pressed against the valve seat part 25c by the urging force of 29. Therefore, abnormal pressure rise in each first oil chamber 8a is prevented, and excessive damping is prevented. Moreover, when the pressure in each second oil chamber 8b increases as described above, the second pressure regulating valve 23 operates to prevent the pressure from increasing, thereby preventing excessive damping.

In the above embodiment, the portions forming the first and second flow passages 17 and 21 are not limited to the portions shown in the drawings, and a portion thereof may be formed in the intermediate piece 5, for example. Further, the mounting locations of the first and second pressure regulating valves 19 and 23 vary depending on the formation locations of the first and second flow passages 17 and 21, and if the structure thereof also has a pressure regulating function, It goes without saying that it does not have to be the one shown in Figure 3.

"Effects of the Invention" As explained above, the torsional vibration suppression device of the present invention includes pressure regulating valves provided in the first flow passage communicating with the first oil chamber and the second flow passage communicating with the second oil chamber, respectively.
When the pressure in the first oil chamber or the second oil chamber exceeds the set value, each pressure regulating valve is activated, which causes the pressure in the first oil chamber to exceed the set value.
Since an abnormal increase in pressure in the oil chamber or the second oil chamber is prevented, excessive damping does not occur even when the viscosity of the lubricating oil increases, and the amount of damping can be maintained at an optimum level.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a partially cutaway side view, Figure 2 is a sectional view, and Figure 3 is a sectional view of the pressure regulating valve. ,
4 to 6 show a conventional torsional vibration suppression device, in which FIG. 4 is a side view, FIG. 5 is a sectional view,
FIG. 6 is an enlarged side view of the main parts. 1...Substrate, 2a...Injection hole, 2...Groove, 4...
...Inner star, 5...Intermediate piece, S...Accommodation space, 7...Spring block, 8a...First oil chamber, 8b...Second oil chamber, 9...Side plate, 11...Tightening ring, P... ...Communication groove, 17...First flow path, 19...First pressure regulating valve, 21...Second flow path,
23...Second pressure regulating valve.

Claims (1)

[Scope of utility model registration request] A substrate having a plurality of intermediate pieces arranged radially thereon, and a plurality of grooves connected to lubricating oil injection holes arranged at predetermined intervals on the outer circumferential surface, the center of the substrate being rotatable with respect to the substrate and liquid-tight. and an inner star provided in the middle piece, and the distal end portion is inserted into each of the grooves of this inner star, and is fitted into each accommodation space between the intermediate pieces, and each accommodation space is connected to each first oil chamber on one side and the other side. a plurality of spring blocks partitioned into second oil chambers, and a ring and a side plate that cover the entirety of the intermediate piece and the spring blocks and are fluid-tightly attached between the base plate and the inner star; At least one of the side plate and the intermediate piece is formed with a communication groove that communicates the housing spaces of the spring blocks with each other, so that the rotation of either the base plate or the inner star can be elastically transmitted to the other. In the torsional vibration suppressing device configured as above, at least one of the base plate, the side plate, and the intermediate piece is provided with a first flow passage communicating with each first oil chamber of each housing space of each spring block and each second oil chamber. A second flow path communicating with the chamber is formed, and the first flow path communicates with the chamber.
A torsional vibration suppression device characterized in that the flow path and the second flow path are each provided with a pressure regulating valve that adjusts the pressure of lubricating oil.