JP2004237851A - Table and system for preventing gear-tooth striking noise - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To show a combination of a propeller and a propeller shaft that prevents noise of gear-tooth striking at a reduction gear in advance before a ship sales company as a purchaser/shipbuilding plant installs a propulsion device on a hull. <P>SOLUTION: This table 10 for preventing noise of gear-tooth striking displays values for preventing noise of gear-tooth striking at a low speed in a vessel includes a propulsion device 1 for transferring power from propulsion machinery comprising an engine 2 and a reduction gear 3 to a propeller 5. Values of the length 13 of a propeller shaft are shown with which tooth-gear striking noise is not generated from the reduction gear 3 at a low speed for a propeller diameter 12 and a propeller shaft diameter 11 respectively for each predetermined value. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ship sales company or a shipbuilding company which purchases an engine from an engine manufacturer and mounts the engine on a ship so that the gear rattle generated at a certain number of rotations of the engine is not generated. Related to the technology provided to the office.
[0002]
[Prior art]
Generally, in a ship propulsion device, an input shaft of a speed reducer is connected to a crankshaft of an engine mounted on a ship via an elastic joint, the speed reducer is provided with a hydraulic clutch, and an output shaft of the speed reducer is provided via a propeller shaft. The propeller is connected. The hydraulic clutch is controlled to a separated state, a slip state, and a directly connected state by controlling a hydraulic pressure according to a boat maneuvering state, and is configured to be able to arbitrarily advance, retreat, or stop the boat. In such a speed reducer in a marine propulsion device, the engine torque tends to fluctuate at low speeds and low loads, and the gears in the speed reducer collide with each other due to backlash, generating rattling noise and causing unpleasant rattle. It is known to cause sound and hull vibrations.
The cause of the rattling noise is a combination of a propeller and a propeller shaft for the engine. Conventionally, after the engine manufacturer, the seller, sells to the ship company or shipyard that is the purchaser, the ship company or shipyard selects the propeller and propeller shaft according to the engine purchased, and the propulsion device And the propulsion device is installed on the hull to sell the ship to the user. If the rattling noise is generated when the ship is running at a low speed, the elastic joints connecting the engine and the speed reducer are provided with different torsional rigidities or shafts in order to prevent the rattling noise. They were replaced with propeller shafts with different diameters, or with propeller shafts with different materials or propellers with different diameters. In addition, a noise reduction valve is attached to the hydraulic device so as to slide a friction plate of a hydraulic clutch provided in the speed reducer, thereby preventing generation of rattling noise. Furthermore, before installing the propulsion device on the hull, there has been a case where a muffler valve is attached in advance (for example, see Patent Document 1).
In other words, since the sales company / shipyard of the ship selects the combination of the propeller and the propeller shaft, even when the combination of the propeller and the propeller shaft is inappropriate for the engine, the propulsion device is mounted on the hull. After installation, it was impossible to know whether or not rattling noise would occur in the speed reducer unless the ship was actually driven at low speed. Therefore, when rattling noise is generated, the elastic coupling, the propeller shaft or the propeller, etc. are replaced, or a muffling valve is provided to prevent the rattling noise, which is troublesome and expensive. .
[0003]
[Patent Document 1]
JP-A-9-250568
[0004]
[Problems to be solved by the invention]
Knowing the proper combination of propeller shaft and propeller for the engine before installing the propulsion device on the ship can solve the above problem, but conventionally engine manufacturers sell engines to ship distributors and shipyards. At this time, there was no explicit limitation on the rattling noise of the reduction gear due to the combination of the propeller and the propeller shaft, and no prediction of whether the combination of the propeller and the propeller shaft would produce rattling noise. Further, although propellers are sometimes specified to a ship company or a shipyard, the specification of the propellers is for the maximum ship speed, and does not specify whether or not rattle is generated. Propeller shafts may also be specified at ship sales companies and shipyards, but this is related to strength protection due to torsion vibration, not to rattle noise.
Therefore, according to the present invention, an engine manufacturer sells an engine so that a combination of a propeller and a propeller shaft that avoids rattling noise can be identified before a ship sales company or shipyard installs a propulsion device on a hull. The aim is to provide a method.
[0005]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0006]
That is, in claim 1, it is a table that displays values for preventing rattle at low speed in a boat equipped with a propulsion device that transmits power from a main engine including an engine and a speed reducer to a propeller. It shows the propeller shaft length and the propeller shaft length value at which no rattling noise is generated from the reduction gear at low speed with respect to the propeller shaft diameter.
[0007]
In claim 2, in the rattle prevention table of the ship, the propeller shaft diameter is described in one of the left and right columns, and the propeller diameter is described in the other column. The propeller shaft length is described in an orthogonal column, and the above described value of the propeller shaft length is a minimum value that does not generate rattle noise with respect to the propeller shaft diameter and the propeller diameter.
[0008]
In claim 3, the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the table for preventing rattle of the boat are shown for each material of the propeller shaft.
[0009]
In claim 4, the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the table for preventing rattle of the ship are shown for each propeller material.
[0010]
In claim 5, the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the table for preventing rattle of the ship are shown for each reduction ratio of the reverse rotation speed reducer.
[0011]
In claim 6, the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the rattle prevention table of the ship are represented for each type of the elastic joint that connects the engine and the reduction gear. .
[0012]
In claim 7, a combination of a propeller shaft diameter, a propeller shaft length, and a propeller diameter that does not generate rattle noise is generated for each type of engine, type of reduction gear, type of elastic joint, material of the propeller shaft, and type of propeller. The data is stored in the storage device, and the type of the engine, the type of the speed reducer, the type of the elastic joint, the material of the propeller shaft, the type of the propeller, the propeller diameter, or the propeller shaft diameter, or the propeller length by the input means, When any one of the values 1 and 2 is input, the remaining values that do not generate rattle noise are displayed.
[0013]
In claim 8, a computer is arranged at each of the engine manufacturer and the ship sales company or the shipyard so that they can communicate with each other via a network, and the computer of the engine manufacturer is a propeller used at the ship sales company or the shipyard. Enter the diameter, propeller shaft diameter, propeller shaft length, and the length of the type of elastic joint that connects the engine and the reducer, and simulate whether rattling noise occurs. If predicted, the propeller diameter or the propeller shaft diameter, or the propeller length, or the type of the elastic joint that does not generate rattle sound is transmitted to the ship dealer or shipyard via the network. is there.
[0014]
In claim 9, a computer is arranged in each of the engine manufacturer and the ship dealer or the shipyard so that they can communicate with each other via a network, and the propeller diameter and the propeller diameter are input by the computer of the ship dealer or the shipyard. When the propeller shaft diameter, propeller shaft length, and the length of the type of elastic joint that connects the engine and the reducer are input, the values are input to the computer of the engine manufacturer via a network, and rattling noise is generated. It calculates whether or not to do so, and transmits the result to a ship sales company or a shipyard via a network.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the invention will be described.
1 is a diagram showing a configuration of the propulsion device, FIG. 2 is a diagram showing a combination table, FIG. 3 is a diagram showing an embodiment of the combination table, FIG. 4 is a diagram showing a propeller shaft diameter, a propeller shaft length, and a propeller in FIG. FIG. 5 is a flow chart of the second embodiment, FIG. 6 is a view showing the configuration of the data communication means, FIG. 7 is a flow chart of the fourth embodiment, and FIG. 8 is a flow chart of the fifth embodiment. It is a flowchart figure.
[0016]
First, a propulsion device for a ship will be described.
As shown in FIG. 1, a propulsion device 1 for a ship includes an engine 2, a speed reducer 3, a propeller shaft 4, a propeller 5, etc., and an input shaft 3 a of the speed reducer 3 protrudes toward the engine 2, and The crankshaft is connected through an elastic joint 6. The input shaft 3a is connected to a first gear 3c via a clutch 3b, and the first gear 3c meshes with a second gear 3e fixed on the output shaft 3d. The output shaft 3d is connected to a propeller shaft 4 extending rearward from a lower portion of the reduction gear 3, and a propeller 5 is fixed to an end of the propeller shaft 4.
[0017]
The drive output of the engine 2 is transmitted from the crankshaft to the input shaft 3a of the speed reducer 3, and then transmitted to the propeller shaft 4 via the clutch 3b, the first gear 3c, the second gear 3e, and the output shaft 3d. Then, the propeller 5 is rotated. The clutch 3b is also connected to a reverse rotation mechanism (not shown) to switch connection / disconnection between the input shaft 3a and the first gear 3c, and to transmit the rotation of the input shaft 3a to the first gear 3c when transmitting the rotation to the first gear 3c. It also has the function of switching directions.
The propulsion device 1 in which the engine 2, the speed reducer 3, and the like are integrally configured as described above is supported by a plurality of vibration-proof members such as a plurality of vibration-proof rubbers, and is installed on the hull of the boat.
[0018]
In a boat equipped with the propulsion device 1 as described above, a large rattle noise is generated in the gears 3c and 3e of the speed reducer 3 due to torsional vibration in a constant low-speed rotation range from the idle speed of the engine 2. May occur. Therefore, in order to eliminate the rattling noise of the speed reducer 3, it is necessary to reduce the resonance rotation speed related to the rattling noise to the engine idle rotation speed or less. By changing to a propeller having a different number, material, and shape, or changing to an elastic joint having a different torsional stiffness, it is possible to lower the resonance rotation speed. Further, the resonance speed can be reduced by changing the type of the engine 2 or the speed reducer 3, but it is difficult to change the type of the engine 2 in consideration of the required output of the engine 2, and It is also difficult to change the type of the machine 3 in consideration of a necessary reduction ratio.
Therefore, an appropriate combination of the elastic joint 6, the propeller shaft 4, and the propeller 5 is a means for preventing generation of rattling noise.
[0019]
Conventionally, a propulsion device is constructed by arbitrarily combining an elastic joint 6, a propeller shaft 4, and a propeller 5 after a purchaser of a ship or a shipyard purchases an engine 2 from an engine manufacturer. 1, the combination of the elastic joint 6, the propeller shaft 4, and the propeller 5 becomes inappropriate, and a rattling sound of the speed reducer 3 may be generated at low speed. In this case, it is obvious that rattling noise is generated in the speed reducer 3 until the propulsion device 1 is mounted on the hull and the engine 2 is brought into a low-speed and low-load state. In order to prevent rattling noise by replacing the gears, propeller shafts, propellers, etc., and attaching a muffler valve to the speed reducer 3, it was troublesome and costly.
[0020]
Accordingly, the present invention proposes a method in which a propeller and a propeller shaft that avoids rattling noise in advance before a ship sales company or a shipyard installs a propulsion device on a hull when an engine manufacturer sells an engine. A method for selling an engine so that the apparatus can be configured is provided. First, a first embodiment will be described.
In the first embodiment, the combination of the propeller 5 and the propeller shaft 4 is clearly indicated to the sales company / shipyard of the ship using the combination table 10, and the combination table 10 is described in the sales materials and the like, and the toothing is performed. The configuration is such that the combination of the propeller 5 and the propeller shaft 4 that can avoid sound can be quickly confirmed.
[0021]
As shown in FIG. 2, a plurality of columns are formed in the combination table 10 divided vertically and horizontally, and are arranged in a matrix showing a relationship among a propeller shaft diameter 11, a propeller diameter 12, and a propeller shaft length 13. The combination table 10 is composed of the upper table 10a and the lower table 10b including items indicating respective components of the propulsion device 1. In the upper table 10a, the propeller shaft diameters 11a, 11b, 11c,... Are described each time the length becomes longer by a predetermined length in the leftmost column, and the propeller diameter 12a is increased each time the length becomes longer by a predetermined length in the uppermost column. ., 12b, 12c,... Further, the reduction ratio 14 of the reduction gear 3 is described in the upper left column. Therefore, a table having different values in the table is prepared for each different reduction ratio.
[0022]
Further, in the column orthogonal to the column in which the propeller shaft diameters 11a, 11b, 11c,... And the column in which the propeller diameters 12a, 12b, 12c, etc. are described, the propeller shaft lengths 13aa, 13ac, 13bb,.・ Is described. The propeller shaft lengths 13aa, 13ac, 13bb,... Described in this column indicate the minimum values for the propeller shaft diameter 11 and the propeller diameter 12 that can prevent the rattling noise of the reduction gear 3. It is.
Thus, the remaining one numerical value can be determined from the combination of any two of the propeller shaft diameter 11, the propeller diameter 12, and the propeller shaft length 13.
[0023]
On the other hand, at least one or more components are described in the display items indicating the components of the propulsion device 1 provided in the following table 10b. For example, in FIG. 2, the type of the engine 2 is displayed in order from the top. Name display section 21, a reduction gear display section 22 for displaying the type of the reduction gear 3, an elastic joint type display section 23 for displaying the type of the elastic joint 6, and a propeller shaft material display section 24 for displaying the material of the propeller shaft 4. , A propeller specification display section 25 for displaying the components of the propeller 5 is provided. The engine name display section 21 and the speed reducer display section 22 are a product name, a model number, and the like. The type of the elastic joint 6 is a high elastic joint, a rubber block, a rubber member such as a rubber cylinder, a damper, or the like. And a spring member.
[0024]
Then, the engine 2 displayed on each of the engine name display section 21, the reduction gear name display section 22, the elastic joint type display section 23, the propeller shaft material display section 24, and the propeller specification display section 25 in the following Table 10b. Each time the type, the type of the speed reducer 3, the type of the elastic joint 6, the material of the propeller shaft 4, the configuration of the propeller 5, and the reduction ratio 14 of the speed reducer 3 described in the above Table 10a are different, the propeller shaft diameter 11 , The propeller diameter 12 and the propeller shaft length 13 are determined, and the values are described in the above table 10a to form a combination table 10, and a table is created for each type and value.
The combination table 10 is prepared for the propulsion device 1 including different combinations of the engine 2, the speed reducer 3, the elastic joint 6, the propeller shaft 4, and the propeller 5, and the combination table 10 3, a propeller shaft diameter 11, a propeller diameter 12, and a propeller shaft length 13 determined according to the type of the elastic coupling 6, the material of the propeller shaft 4, or the material of the propeller 5 are described. You.
[0025]
A specific example using the combination table 10 will be described. In FIG. 3, if a propeller diameter is 1200 mm and a propeller shaft diameter is 90 mm when a speed reducer having a reduction ratio of 3.05 is used, the propeller shaft length will be described. Is set to be 1600 mm or more so that the rattling noise of the speed reducer can be prevented. The engine is ○○○-○○, the reducer is △-△△, the elastic joint is a high elastic joint of model XXX, the propeller material is stainless steel of SUSXXX and the material of the propeller is □□ It can be confirmed that brass steel is used.
[0026]
FIG. 4 shows the relationship between the propeller shaft diameter, the propeller shaft length, and the propeller diameter in FIG. 3, in which the vertical axis represents the propeller shaft diameter, and the horizontal axis represents the propeller shaft length. It is. The propeller diameter lines 26, 27, 28, and 29 are plotted with the minimum values of the propeller diameters that can prevent rattling noise, and are located above the propeller diameter lines 26, 27, 28, and 29. By selecting a combination of propellers and propeller shafts that are positioned, it is possible to prevent rattling noise.
[0027]
Next, a second embodiment will be described.
The second embodiment uses a personal computer or a computer to input a propeller shaft diameter, a propeller shaft length, a propeller diameter, an elastic joint, an engine type, a reducer type, etc., so that rattling noise is generated. A simulation is performed to determine whether or not a suitable combination table is created and calculated.
Specifically, as shown in FIGS. 5 and 6, the hardware 42 includes a known CPU 43 serving as a controller, a RAM 44, a ROM 45, a display device (output device) 46, an input device 47, and a storage device 48. And an interface 49 and the like. The display unit 46 is a display unit such as a CRT or a liquid crystal display, or an output unit such as a printer. The input unit 47 is a keyboard, a mouse, or the like, and is an input unit or a selection unit. The network will be described later.
When the type of the elastic joint is determined by the input device 47, the propeller shaft diameter, the propeller shaft length, and the propeller diameter are input. When the elastic joint is also changed according to the specification, the coefficient corresponding to the type of the elastic joint is inputted. A simulation is performed from these inputs using simulation software (31). In other words, the propeller shaft length and the propeller diameter are each changed by a predetermined value, and the threshold value of the propeller shaft diameter at which no rattling noise is generated (or is generated) is calculated, and the value at which the rattling noise is not generated is displayed. The created combination table 10 is created (32), and the created combination table 10 is printed out or described in sales materials such as an instruction manual and technical news (33). This is specified by the engine manufacturer to the ship sales company and shipyard (34). Therefore, the ship sales company or shipyard knows the combination of the propeller 5, the propeller shaft 4, and the elastic joint 6 that does not generate rattling noise in the stage of ordering the engine, so that the engine does not generate rattling noise. The propeller 5, the propeller shaft 4, and the elastic joint 6 can be selected, so that the exchange of the elastic joint and the installation of the muffling valve are not required after the assembly, so that the labor can be saved and the cost can be reduced. However, instead of calculating, for each model of engine, model of reduction gear, type of elastic joint, material of propeller shaft, type of propeller, the combination of propeller shaft diameter, propeller shaft length and propeller diameter that does not generate rattle noise. Is stored as a map in the storage device, and the input device inputs the type of the engine, the type of the reduction gear, the type of the elastic coupling, the material of the propeller shaft, the type of the propeller, the propeller diameter, or the propeller shaft diameter, or the propeller. When any one of the values of length is input, the remaining value that does not generate rattle can be displayed on the display device.
[0028]
Next, a third embodiment will be described.
In the third embodiment, the combination of the propeller 5, the propeller shaft 4, and the elastic joint 6 is specified to a ship sales company or a shipyard via a network 40 (including the Internet). Create a table of the propeller shaft diameter, the propeller shaft length, the propeller diameter, and the type of the elastic joint 6 that does not generate rattle noise, and send it to the ship's sales company or shipyard via data communication means. By transmitting, or the engine manufacturer publishes a table on which no rattling noise is generated on the homepage etc., the ship sales company / shipyard receives the table or browses the homepage, and the desired propeller 5 and The propeller shaft 4 and the elastic joint 6 can be selected.
[0029]
.. Are connected by a network (Internet) 40, and each hardware 42 includes the CPU 43, the RAM 44, the ROM 45, the display device 46, and the input device 47. , A storage device 48, and the like, and a network interface 49.
[0030]
Next, a fourth embodiment will be described.
In this case, an example in which the engine manufacturer recommends a propeller shaft diameter, a propeller shaft length, a numerical value of the propeller diameter, and a type of the elastic joint 6 for avoiding rattling noise to a ship sales company or shipyard is described with reference to FIG. A more detailed description will be given.
First, the type of the elastic joint 6 owned or to be purchased or purchased by the ship sales company / shipyard 52 and the values of the propeller shaft diameter, the propeller shaft length, and the propeller diameter are inputted using input means (53), and the data thereof are entered. Is transmitted to the engine manufacturer 54 through the network 40. The engine manufacturer 54 simulates whether or not rattling noise is generated with respect to the data from the ship sales company / shipyard 52 (55), and generates a table or a table in which the rattling noise is predicted. A table of combinations in which rattling noise does not occur is created (56). This table is specified to the ship sales company / shipyard 52 via the network 40. Alternatively, with respect to the input data, the respective values or tables of the combination of the elastic joint 6 or the propeller shaft 4 or the propeller 5 that does not generate rattle noise are transmitted and changed to the values. (57).
[0031]
Further, in the fifth embodiment, it is possible for the sales company / shipyard 62 of a ship to obtain a prediction result of whether or not rattle noise is automatically generated through the network 40 by inputting various values. . The procedure in this case will be described with reference to FIG.
First, the ship sales company / shipyard 62 inputs the type or desired specifications (horsepower, size, etc.) of the engine 2 of the ship to be sold or manufactured by the input means (62). Is input (63), and then the type or desired specifications (speed ratio, size, etc.) of the speed reducer are input (64). However, the type of the engine, the elastic coupling, and the type of the reduction gear may be selected on the selection screen.
[0032]
Then, the numerical values of the propeller shaft diameter, the propeller shaft length, and the propeller diameter to be assembled to the engine, the elastic coupling, and the reduction gear are input by input means (65), and the computer of the engine manufacturer 60 is accessed via the network 40. I do. The computer of the engine manufacturer 60 compares these data with the engine database 50a, the reduction gear database 50b, the elastic joint database 50c, and the like stored in the storage device 50, and can apply the input value to the engine. A gear, a speed reducer and an elastic joint are selected, and whether or not rattling noise is generated is predicted by the rattling noise generation simulation software 66. When the result is obtained, the result is transmitted through the network 40 and displayed on the display means of the ship company / shipyard 62 (67). When it is predicted that a rattling noise is generated, a combination of the elastic joint 6 for avoiding the rattling noise and the combination of the propeller 5 and the propeller shaft 4 is displayed together with the prediction result. Thus, the ship sales company / shipyard 61 can easily confirm the elastic joint 6 and the combination of the propeller 5 and the propeller shaft 4 through the network 40.
In addition, the ship sales company / shipyard stores the data provided by the engine manufacturer in the storage device, and performs the simulation of the rattle noise generation prediction only on the intranet without going through the external network, and the elastic joint and the propeller It is also possible to confirm the combination of the propeller shafts.
[0033]
As described above, when the engine manufacturer sells the engine 2 to a ship sales company or a shipyard, the propeller 5 and the propeller shaft 4 that avoid the rattling noise of the speed reducer 3 using the combination table 10. And the combination of the elastic joints 6 and whether or not rattling noise is generated through the network 40 can be confirmed. Therefore, the ship sales company / shipyard needs to install the elastic joints 6 before installing the propulsion device on the hull. Thus, an appropriate combination of the propeller 5 and the propeller shaft 4 is known, and it is possible to prevent the rattling noise from being generated in advance. Therefore, rattling noise does not occur, and replacement of the elastic joint and installation of the muffling valve are not required, so that it is possible to save labor and cost. Therefore, engine manufacturers can also promote sales.
[0034]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
[0035]
In other words, as shown in claim 1, in a boat equipped with a propulsion device that transmits power from a main engine including an engine and a speed reducer to a propeller, a table displaying values for preventing rattle at low speed is provided. Propeller shaft length and propeller shaft length value that does not generate rattle noise from the reducer at low speed for the propeller diameter and propeller shaft diameter are displayed, so quickly check the proper combination of propeller shaft diameter and propeller diameter and propeller length Therefore, it is possible to reliably prevent the generation of rattle noise. This eliminates the need for replacement of the elastic joint and installation of the silencing valve, so that the ship sales company and shipyard can save time and cost. Therefore, engine manufacturers can also promote sales.
[0036]
As shown in claim 2, in the rattling noise prevention table of the ship, of the columns divided vertically and horizontally, the propeller shaft diameter is described in one of the left and right, the propeller diameter is described in the other column, and each of these columns is described. The propeller shaft length is described in a column orthogonal to the above, and the value of the propeller shaft length described above is the minimum value such that the rattling noise does not occur for the propeller shaft diameter and the propeller diameter, so that the propeller shaft An appropriate combination of the shaft diameter, the propeller diameter, and the propeller length can be confirmed, and generation of rattling noise can be reliably prevented.
[0037]
As shown in claim 3, the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the table for preventing the rattle of the ship are expressed for each material of the propeller shaft, so that the avoidance accuracy is increased, and The generation of rattling noise can be prevented.
[0038]
As shown in claim 4, the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the table for preventing rattle of the ship are expressed for each material of the propeller, so that the avoidance accuracy is increased and the teeth are reliably prevented. It is possible to prevent occurrence of hitting sound.
[0039]
As shown in claim 5, the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the rattle prevention table of the ship are represented for each reduction ratio of the reverse rotation speed reducer, so that avoidance accuracy is increased, The generation of rattling noise can be reliably prevented.
[0040]
As shown in claim 6, since the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the rattle prevention table of the ship are represented for each type of the elastic joint that connects the engine and the reduction gear, The avoidance accuracy is increased, and the generation of rattling noise can be reliably prevented.
[0041]
As shown in claim 7, a combination of a propeller shaft diameter, a propeller shaft length, and a propeller diameter that does not generate rattling noise for each type of engine, type of reduction gear, type of elastic joint, material of the propeller shaft, and type of propeller. Is stored in a storage device, and the type of the engine, the type of the speed reducer, the type of the elastic coupling, the material of the propeller shaft, the type of the propeller, the propeller diameter, or the propeller shaft diameter, or the propeller length is input by the input means. When one of the values of 1 or 2 is entered, the remaining values that do not generate rattle are displayed, so that the ship sales company / shipyard has an elastic joint before installing the propulsion device on the hull, An appropriate combination of the propeller and the propeller shaft is known, and it is possible to prevent rattling noise in advance. Therefore, rattling noise does not occur, and replacement of the elastic joint and installation of the muffling valve are not required, so that it is possible to save labor and cost. Therefore, engine manufacturers can also promote sales.
[0042]
As described in claim 8, a computer is arranged in each of the engine manufacturer and the ship sales company or the shipyard so that they can communicate with each other via a network, and the computer of the engine manufacturer is used at the ship sales company or the shipyard. Inputting the propeller diameter, propeller shaft diameter, propeller shaft length, and the length of the type of elastic joint that connects the engine and the reducer, simulates whether rattling noise occurs and generates rattling noise. If it is predicted, the propeller diameter or the propeller shaft diameter, or the propeller length, or the type of the elastic joint, which does not generate rattle, is transmitted to the ship dealer or shipyard via the network. Before installing the propulsion device on the hull, ship distributors and shipyards must ensure that the elastic joints, propellers and propeller shafts are properly Understand combined, advance the rattle can be prevented from occurring. For this reason, rattling noise is not generated, and replacement of the elastic joint and installation of the muffling valve are not required, so that labor can be saved and cost can be reduced. Therefore, engine manufacturers can also promote sales.
[0043]
As described in claim 9, a computer is arranged in each of the engine manufacturer and the ship sales company or the shipyard so that they can communicate with each other via a network, and the input means of the computer of the ship sales company or the shipyard determines the propeller diameter. Enter the propeller shaft diameter, propeller shaft length, and the length of the type of elastic joint that connects the engine and the reducer.Then, input the values to the computer of the engine manufacturer via a network, The ship's sales company or shipyard calculates the elastic joint, propeller, and propeller before the propulsion device is installed on the hull, because it calculates whether or not it will occur and sends the result to the ship sales company or shipyard via the network. An appropriate combination of the shafts is known, and it is possible to prevent rattling noise from being generated in advance. Therefore, rattling noise does not occur, and replacement of the elastic joint and installation of the muffling valve are not required, so that it is possible to save labor and cost. Therefore, engine manufacturers can also promote sales.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a propulsion device.
FIG. 2 is a diagram showing a combination table.
FIG. 3 is a diagram showing an example of a combination table.
FIG. 4 is a view showing a relationship among a propeller shaft diameter, a propeller shaft length, and a propeller diameter in FIG. 3;
FIG. 5 is a flowchart of the second embodiment.
FIG. 6 is a diagram showing a configuration of a data communication unit.
FIG. 7 is a flowchart of a fourth embodiment.
FIG. 8 is a flowchart of the fifth embodiment.
[Explanation of symbols]
1 Propulsion device
2 Engine
3 speed reducer
4 Propeller shaft
5 Propellers
6 Elastic joint
10 Combination table
11 Propeller shaft diameter
12 Propeller diameter
13 Propeller shaft length

Claims (9)

This is a table showing values for preventing rattle noise at low speed in a ship equipped with a propulsion device that transmits power from a main engine consisting of an engine and a speed reducer to a propeller. A rattling noise prevention table for a ship, which displays values of a propeller shaft length at which the rattling noise is not generated from the reducer at low speed. In the table for preventing the rattle of the ship, the propeller shaft diameter is described in one of the left and right columns, and the propeller diameter is described in the other column, and the propeller shaft is described in an orthogonal column of these columns. 2. The ship according to claim 1, wherein the length is described, and the value of the described propeller shaft length is a minimum value such that rattle noise does not occur with respect to the propeller shaft diameter and the propeller diameter. Table for preventing rattle noise. 3. The rattle prevention table according to claim 2, wherein the values of the propeller diameter, the propeller shaft diameter, and the length of the propeller shaft described in the table are shown for each material of the propeller shaft. . 3. The table according to claim 2, wherein the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the table are shown for each propeller material. 3. The rattling sound of a ship according to claim 2, wherein the values of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the table for preventing the rattling sound of the ship are represented for each reduction ratio of the reverse rotation speed reducer. Prevention table. The value of the propeller diameter, the propeller shaft diameter, and the propeller shaft length described in the rattle prevention table of the ship are represented for each type of the elastic joint that connects the engine and the speed reducer. Table for preventing rattle of ships. For each model of engine, model of reduction gear, type of elastic joint, material of propeller shaft, and type of propeller, data on the combination of propeller shaft diameter, propeller shaft length and propeller diameter that does not generate rattle noise is stored in the storage device. The input means may be used to select one or two of an engine type, a speed reducer type, an elastic joint type, a propeller shaft material, a propeller type, and a propeller diameter or a propeller shaft diameter or a propeller length. A rattling sound preventing system for a boat, wherein when the value of (1) is input, the remaining value at which rattling noise does not occur is displayed. Computers are arranged at the engine manufacturer and the ship dealer or shipyard so that they can communicate with each other over the network.The computer of the engine manufacturer has the propeller diameter used by the ship dealer or shipyard, and the propeller shaft diameter. When inputting the length of the propeller shaft and the length of the type of elastic joint that connects the engine and the reduction gear, it simulates whether rattling noise is generated, and if it is predicted that rattling noise is generated, Transmitting the propeller diameter or the propeller shaft diameter or the propeller length or the type of the elastic joint which does not generate rattling noise to a ship sales company or a shipyard via a network. Hammering prevention system. Computers are arranged at the engine manufacturer and the ship sales company or shipyard, respectively, so that they can communicate with each other via a network.The propeller diameter, the propeller shaft diameter, and the propeller After inputting the shaft length and the length of the type of elastic joint that connects the engine and the reducer, the values are input to the computer of the engine manufacturer via a network to calculate whether rattling noise is generated. And transmitting the result to a ship dealer or a shipyard via a network.

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