JPH02175497A - Vibrationproof device for vessel engine - Google Patents

Abstract

PURPOSE:To deal with the case where the weight distribution is nonuniform by individually controlling each opening/closing valve for air springs on the basis of each detection signal of the shift sensors arranged at the supporting positions corresponding to the air springs. CONSTITUTION:When one among shift sensors senses the lowering below a previously set height position, an opening/closing valve 12 in an air feeding circuit is opened by the control signal supplied from a control circuit which detects said lowering, and the high pressure air is fed into an air spring 3 corresponding to the shift sensor, and the internal pressure is increased to push up an engine damper 4 having the air spring 3 to a set height against a supported load. On the contrary, when the internal pressure of the air spring 3 is increased by the rise of the environmental temperature, and the supporting position is raised, the opening/closing valve 12 and a discharge valve 11 are opening-operated by the signal supplied from the shift sensor which senses the rise of the supporting position, and the air in the air spring 3 having the increased internal pressure is discharged by a proper quantity.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a vibration isolator for a marine engine, and more specifically, in addition to the vibration isolation function of an air spring, it is also capable of horizontally supporting the engine even when the engine load distribution is uneven. Relating to a device for engine mounting means. [Prior Art] Conventionally, when installing an engine on a ship, a hard elastic body such as rubber is interposed between the engine and the ship's hull to fix the engine. That is, by placing this J4 elastic body at the four corners of the engine part,
By evenly supporting the engine load with these elastic bodies, engine vibrations during operation are prevented from being transmitted to the ship's hull, reducing discomfort for each crew member and preventing equipment failure due to vibrations. It is considered as such. In this rubber mounting means, the rigidity of the support body is made high so as to support the engine load and to withstand the large-amplitude vibrations that occur when starting and stopping the engine. In addition to engine support using elastic bodies such as rubber, there are also mounting means using oil dampers, but in this case as well, in order to cope with large amplitude vibrations, like the rubber mounting means, The rigidity is set to a certain degree. Therefore, since the rigidity of such conventional mounting means is set to be high, insulation against high frequency vibrations is not good. As a vibration isolating means to solve this problem, a damper 4Ir& which is equipped with an air spring which has particularly excellent insulation properties against high-frequency, small-amplitude vibrations can be considered. In this case, it is effective to use a shock absorber in conjunction with the air spring in order to suppress low-frequency, large-amplitude vibrations that occur when starting and stopping the engine. (Problem to be solved by the invention) By the way, although an engine damper using such an air spring exhibits an excellent effect as a vibration isolating means, there is a risk that it will tilt if the volume distribution of the supported engine is unrestricted. Depending on the location of the dampers, which are distributed at the four corners of the support base, the damper stroke may not be fully utilized due to extreme expansion or contraction, and the damper may not be able to take full advantage of its anti-width mechanism. Due to the axial vibration of the engine shaft and its bearings, excessive force is applied to the engine 411, which is undesirable. Therefore, 1. The present invention is designed for use when the weight distribution of the engine is generally uniform, but due to the space for #l or the layout of the assembly of auxiliary equipment, the weight distribution may be uneven. The purpose of this project is to develop an engine vibration damping system using air springs that can cope with such problems. (Means for Solving the Problem) In order to achieve this object, the present invention provides an engine support system configured by arranging a plurality of engine dampers each equipped with an air spring. On the other hand, a plurality of displacement sensors corresponding to each air spring are placed in different support locations, and each of the on-off valves is controlled based on the signals detected by these displacement sensors. A vibration isolating device for a marine engine configured to perform separate i'v control is proposed. (Function) In other words, the air spring is in a solitary state in which the air supply path between the air springs and other air springs disposed in parallel with each other is cut off by the on-off valve disposed in the air supply circuit. The engine is maintained in a horizontally supported state by applying internal pressure to the air springs in each of the plurality of dampers corresponding to the load supported by the air springs. detects the height of the location and constantly monitors its displacement. Therefore, when one of these displacement sensors senses that the height has fallen below the previously set height position, a control signal from the control circuit that detects this is sent to the opening/closing valve in the air supply circuit. opens, and sends high-pressure air through the circuit to the air spring corresponding to (close to) the displacement sensor, increasing its internal pressure and causing the engine damper equipped with the air spring to rise to the set height against the supporting load. (water retaining position). On the other hand, when the internal pressure of the air spring increases due to a rise in ambient temperature, etc., and the support position becomes higher, the control circuit receives a signal from the displacement sensor that detects this and controls the on-off valve and, if necessary, For example, by opening another discharge valve, the air inside the air spring, where the internal pressure has increased, is discharged in an appropriate place. (Example) FIG. 1 is a schematic diagram showing an example of the present invention. The damper component 4 with the air spring 3 twisted is placed in the four corner areas of the support plate 2, which is the sum of 4HEtlD of the engine part 1, and the support plate 2 is attached to the hull 5. Each air spring 3 in these four corner areas is
As shown in FIG. 2, compressed air is sucked in through a filter 8 by a near compressor 7 driven by an electric motor 6, and then passed through a desiccator 10 with a relief valve 9.
Opening/closing of air supply solenoid valves 12 arranged in respective air supply paths to each air spring 3 or each group thereof: tAn, the air is supplied to each air spring 3 or each group independently and separately, These air supply solenoid valves

[Exhaust solenoid valve 1 provided at the base of the common air supply path passing through the desiccator 10 under selective opening of two or more
1 to release the internal air of the air spring to the atmosphere. And 2, for example, as shown in the third figure, of the engine dampers 4 placed at the four corners of the support plate 2, the portion Jj! ! For the dampers n1 and n, which are equal to each other, one displacement sensor 20 is installed at an intermediate position of the arrangement t,
For dampers n or n4 whose shared weights are different from each other, the dampers n and n are the same. A displacement sensor 20 is installed at a position close to each damper n or ni. Of course, if the weights to be borne by the dampers n and n are different, the connection of the air passages between them is disconnected and the air passages between them are separated in the same way as the other engine dampers n1 and n4. The air supply solenoid valves 12 may be placed at the respective locations. FIG. 4 shows an example of the displacement sensor 21 installed corresponding to each damper 4 having a different negative load. In other words, the displacement sensor 20 installed between the support plate 2 and the hull 5 (specified section A) consists of a cylinder 21 whose each end is attached to the cap, and a rod z2 that can be freely inserted and removed, and is moisture-proof and dust-proof. Photointerrupters A and B, each consisting of a light emitting diode and a light receiving element facing each other with the rod 22 in between, are arranged somewhat separated from each other in the movement range of the rod z2 in the cylinder sealed 23 for the purpose. can be,
On the other hand, a slide 24 is drilled in the middle area of the lot 22 that intrudes toward the arrangement position of the photointerrupters A and B, and light from the light emitting diodes in the 1γ1 photointerrupters A and B is received under the intrusion of the road. It is configured to be able to project light toward the element. According to the embodiment having such a configuration, the control circuit is actuated by closing the main switch, etc., to start the detection operation of each displacement sensor 20, and to set the other mechanical parts in a ready state for operation. That is, in these displacement sensors 20, when the cylinder 21 and the lot 22 are installed, the distance between both ends (section length) is L, and the detection dead zone is 2mm, and L=L, the section length expressed by 2mm. is the specified value. Then, when t>tl+i, the inner tip of the rod 22 is removed from the placement position of the photointerrupter B, and the photointerrupter B is turned on, while the other photointerrupter A is placed in the placement position of the lot 22. Since the inner end tip region is intruding, it is in the OFF state. On the other hand, in the state shown in FIG. 4 in which the rod 22 has entered the cylinder 2I a little more than in the previous state (state with the specified value), the tip of the rod 22 is located at the position where the photointerrupters A and B are arranged. Both photointerrupters A and B enter the OFF state. Following this, the rod 22 further advances (Ll-
intersection ≥L>Lt), the slot 24 of the lot 22 is placed at the location of the photointerrupter A, and it is turned on by the light emitted from the photodiode. When it does not reach the placement area of interrupter B, it is in the OFF state. Then, as the loft 22 penetrates further into the cylinder, the edge of the slit 24 becomes shorter than the value L2, which is short enough to reach the arrangement area of the photointerrupter B.
When the state is reached, both photointerrupters A and B are in the ON state. The table below shows the current displacement status and signal contents of each of the four motes in the displacement sensor 20. Therefore, if the control circuit determines that the current support position is high based on the output of the displacement sensor 20 in each of the above modes (mode 1), the air supply solenoid valve I2 corresponding to the displacement sensor 20 is activated by the control signal from now on. Since the exhaust solenoid valve 11 is also opened at the same time, the air in the air stripe song 3 of the damper 4 at the high support position is exhausted, and the output of the displacement sensor 20 that detects the displaced support position is set to the specified value. (Mote 2), the 4 solenoid valves 12 for air supply and exhaust
and 11, respectively. In addition, as shown in mode 3 and mode 4, the displacement sensor 2
When the control circuit determines that it is in a low support position based on the output of 0, it starts the compressor 7 based on the control signal from now on and opens the air supply solenoid valve I2 in the air supply path to the air spring 3 in the corresponding engine damper 4. Then, compressed air is fed into the air spring 3 until the output of the displacement sensor 20 reaches the specified value (mode 2).Of course, when the output reaches the specified value, the compressor 7 is stopped and the air supply is stopped. Close solenoid valve I2. The internal pressure adjustment control for the air springs 3 may be carried out sequentially for each air spring 3 while repeating the above two operations, or may be carried out simultaneously for each air spring 3 in each mode. Note that the control order of the above modes does not necessarily have to be performed sequentially from mote 1 to mote 4 as described above, and can be arbitrarily set such as the reverse order. [Effects of the Invention] As described above, according to the device of the present invention, the internal pressure of the air spring in each damper that supports the engine is determined by the signals from the plurality of displacement sensors arranged at different support locations, and the internal pressure of the air spring corresponding to the damper is determined by Since the configuration is configured to adjust the pressure individually for each engine, it is possible to easily and appropriately support engines with different pressure distributions in a specified state, and to eliminate unnecessary parts from the engine drive section. It is possible to measure engine vibration isolation by fully demonstrating the functions of each damper without imposing any burden, and its effects are extremely significant in practical use.

[Brief explanation of the drawing]

Is Figure 1 uninvented? T! ! The same schematic diagram showing the configuration of one embodiment, FIG. 2 is a configuration diagram showing an example of the air supply circuit to the air spring in the present invention IA, No. 312 is a plan view showing an example of damper arrangement in the present invention device, FIG. 4 is a longitudinal sectional side view showing an example of the displacement sensor in the device of the present invention. (Explanation of symbols) 3...Air spring 4...Engine damper 11...Exhaust solenoid valve 12...Air supply solenoid valve 20...Displacement sensor

Claims (1)

[Claims] In an engine support system configured by arranging multiple engine dampers equipped with air springs, an on-off valve is placed in the air supply circuit to the air spring of each damper, and a displacement valve corresponding to each air spring is installed. A vibration isolating device for a marine engine, characterized in that a plurality of sensors are arranged at different support locations, and the opening/closing valves are individually controlled based on signals detected by these displacement sensors.