JPH0746538B2 - Insulated flange joint for torque transmission of ship propulsion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) For example, in a ship, in order to prevent spark erosion between a shaft journal and a bearing due to a potential difference between a propeller shaft, which is a propulsion shaft, and a hull, a propeller shaft is used. The intermediate shaft between the crankshaft of the diesel engine and the crankshaft of the diesel engine is connected in an electrically insulated state by an insulating flange joint. A flange joint for torque transmission of a ship propulsion device for connecting in an electrically insulated state, in particular, a pair of flanges that abut against each other via an electrically insulating member, and press fit into the reamed holes of both flanges. A shaft portion, a reamer bolt having an electric insulation layer formed thereon, a nut screwed to the reamer bolt, a head portion of the reamer bolt and one end face of the flange, and a nut. It is inserted respectively through between the opposite end faces of the other flange, a metal washer and electrical insulation washer made, to a torque-transmitting flange joint of the ship propulsion unit which is formed by including a.

(Prior Art) A conventional torque transmission flange joint of this type of ship propulsion device has a flange provided at the ends of two connected shafts (not shown) to be connected, as shown in FIG. The reamed holes 1a and 2a are made to abut against each other 1 and 2 through the electric insulation member 3, and the shaft portion 5 of the reamer bolt 4 is inserted into the metal washer 9 and the electric insulation washer 10. Then, until both washers 9 and 10 are in a state of being pressed between the head 6 of the reamer bolt 4 and the flange 1, the reamer holes 1a and 2
Press into a with a hydraulic tool or a hammer, insert a washer 12 made of an electrically insulating material and a washer 11 made of metal into the male screw portion 5a formed at the tip of the shaft portion 5 of the reamer bolt 4, and then screw the nut 7. By mating and tightening this nut 7, both connected shafts, that is, both flanges 1 and 2, are pressed into the electric insulating member 3 and the reamer holes 1a and 2a. It is configured such that it can be fastened in a state of being electrically insulated through the electric insulating material layer 8 formed by coating on 5b and the electric insulating material washers 10, 12.

(Problems to be Solved by the Invention) However, in such a torque transmission flange joint of a ship propulsion device, in particular, one flange 1 and the reamer bolt 4 are used.
Washers 9,1 sandwiched between the end faces 1b, 6a facing the head 6 of the
0 is not positioned concentrically with the bolt axis, but is likely to be positioned with respect to the bolt axis or in a state where they are misaligned with each other, due to the fastening action of the flanges 1 and 2, and the washer made of an electrically insulating material. There is a possibility that inconvenience may occur due to the insulation effect of 10.

That is, in the prior art, the washers 9 and 10 are members separate from the reamer bolt 4 and have an inner diameter of the reamer bolt 4
It cannot be set smaller than the outer diameter of the reamed hole press-fitted portion 5b formed with the electric insulating material layer 8 on the maximum diameter portion of the shaft portion 5, so that the inner diameter of the washers 9 and 10 can be set to the reamed hole press-fitted portion of the reamer bolt 4. The outside diameter of 5b is set by a predetermined amount. Further, an annular recess 5c is formed at the base end portion of the head portion of the shaft portion 5 of the reamer bolt 4. This prevents the corners of the abutted flange 1 from damaging the reamer bolts 4, and the torsional stress and the tensile stress due to the tightening act on the bolts 4 with the rotation of the propulsion shaft of the ship propulsion device. That is, the shear stress acting on the reamer bolt 4 used under such severe conditions is exerted only by the reamer hole press-fitting portion 5b which is the maximum diameter portion of the shaft portion 5 of the reamer bolt 4. Therefore washer 9,
Since the inner diameter of 10 is larger than the outer diameter of the reamer hole press-fitting portion 5b by a predetermined amount, and the annular recessed portion 5c is formed in the head base end portion of the shaft portion 5 of the reamer bolt 4, the washers 9, 10 are provided.
Of the washer due to its own weight or vibration or shock during press fitting.
The inner diameter of 9,10 falls into the recess 5c, and the washer 9,10
However, for example, as shown in FIG. 3, the head portion 6 of the reamer bolt 4 is displaced with respect to the bolt axis line or in a state of being misaligned.
It is apt to be held between the flange and the flange 1. When the washers 9 and 10 are in such a misaligned state, the contact area between the head 6 of the reamer bolt 4 and the metal washer 9 or between both washers 9 and 10 is reduced. Reamer bolt head 6 via washers 9,10
The flange tightening stress due to is too high, and the stress distribution is not uniform around the reamed holes, so that the flanges 1 and 2 cannot be fastened properly. Moreover, voids 13 and 14 are formed in the area where the metal washer 9 and the flange 1 are opposed to each other without the electrically insulating washer 10 interposed, and the insulating effect between the both 1 and 9 is significantly reduced. The insulating effect is further reduced by the foreign matter entering the void portion 13 on the outer peripheral side.

Further, since the washers 9 and 10 are set such that the inner diameter thereof is larger than the maximum diameter of the shaft portion 5 of the reamer bolt 4 and are inserted into the shaft portion 5 in a state where they can move freely to some extent, the shaft portion 5 When press-fitting into the reamed holes 1a and 2a,
As shown in FIG. 4, the washer, especially the metal washer 9,
The posture and position of the metal washer 9 are remarkably changed by vibrations and shocks caused by the press-fitting.
As a result, the electric insulating material layer 8 may be damaged. When the electric insulation layer 8 is damaged, the reamer bolt 4
At the time of press-fitting, the electric insulating material layer 8 may be peeled from the scratched portion.

Further, if the reamer bolt 4 is press-fitted while the washers 9 and 10 are held concentrically with the bolt axis, the above-mentioned inconvenience does not occur, but the connecting work involving such holding work is extremely troublesome. , The work efficiency will be drastically reduced. Moreover, it is extremely difficult and very dangerous to keep the washers 9 and 10 in a constant posture during press-fitting work that involves considerable vibration and shock.

Also, the opposite end faces 2b, 7a of the other flange 2 and nut 7
The washers 11 and 12 that are interposed between the washers 11 and 12 may have the same inconvenience as described above.

That is, the inner diameters of the washers 11 and 12 are set to be larger than the outer diameter of the male screw portion 5a of the reamer bolt 4 by a predetermined amount.
And the reamer hole press-fitted portion in the shaft portion 5 of the reamer bolt 4.
Since the annular recess 5d is formed at the boundary between the male screw portion 5a and the male screw portion 5a, the amount of protrusion of the male screw portion 5a from the nut seat surface 7a when the nut 7 is tightened is determined by the metal washer 11
If it is smaller than the thickness of the flanges 1,2, for example, as shown in FIG. 3, the washers 11,12 may be misaligned with respect to the nut axis, that is, the bolt axis, or with each other.
In view of the fastening action and the insulating effect of the washer 12 made of an electrically insulating material, the same inconvenience as described above will occur.

Such inconvenience can be avoided by tightening the nut 7 while holding the washers 11 and 12 concentric with the bolt axis line, and this work is different from the above-described work of holding the washers 9 and 10 in the bolt press-fitting work. Can be done without the difficulties and dangers of
It is still a troublesome work and further reduces the connection work efficiency.

The present invention has been made in view of the above circumstances, while having a configuration for ensuring safety against breakage of the reamer bolt,
Even when working in a narrow space such as the bottom of a ship, the torque transfer performance and the electrical insulation performance can be maintained without causing any inconvenience in the fastening action and the electrical insulation effect due to the misalignment of the washer. It is an object of the present invention to provide a torque transmission flange joint for a ship propulsion device, which enables extremely easy and efficient shaft connection.

(Means for Solving Problems) In order to achieve the above object, a torque transmission flange joint of a ship propulsion device according to a first aspect of the present invention includes a pair of flanges that are abutted with each other via an electric insulating member, A reamer bolt having an annular recessed portion at the base end portion of the large-diameter shaft portion that is press-fitted into the reamer holes of both flanges, the large-diameter shaft portion having an electric insulation layer coated thereon, and the reamer bolt A nut to be mounted, a metal washer and a washer made of an electrically insulating material, which are respectively inserted between the facing surfaces of the head of the reamer bolt and the one flange and between the facing surfaces of the nut and the other flange. In an insulating flange joint for torque transmission of a ship propulsion device that consists of, on the seat surface of the head of the reamer bolt,
The metal washer and the washer made of an electrically insulating material are bonded and held by an adhesive in a state of being coaxial with the bolt axis.

Further, a torque transmitting flange joint for a marine vessel propulsion device according to a second aspect of the present invention includes a pair of flanges that abut against each other via an electrically insulating member, and a head portion of a large-diameter shaft portion that is press-fitted into reamed holes of both flanges. A reamer bolt having an annular recess at each boundary of the male screw portions of the base end portion and the large-diameter shaft portion, and the large-diameter shaft portion covered with an electrical insulating material layer, and the reamer bolt screwed onto the reamer bolt. A ship comprising a nut, a metal washer and a washer made of an electrically insulating material, which are respectively inserted between the facing surfaces of the head of the reamer bolt and one flange and between the facing surfaces of the other flange of the nut. In the torque transmission insulating flange joint of the thruster, when the metal washer and the electric insulating material washer are bonded and held to the bearing surface of the head of the reamer bolt with the adhesive in a state of being coaxial with the bolt axis line. In, the seating surface of the nut, in which adhered held in the nut axis and concentric with an adhesive the metal washer and electrical insulation washer made.

(Embodiment) Next, the configuration of the present invention will be specifically described based on the embodiment shown in FIGS. 1 and 2.

That is, the torque transmission flange joint of the marine vessel propulsion device of this embodiment is fixed to the end of the connected shaft (not shown) to be connected, and the reamed holes 21a and 22a respectively formed therein.
A pair of circular flanges abutted against each other
Insert the insertion hole 23a between the reamed holes 21 and 22
Epoxy glass or polyimide-glass laminated plate (hereinafter referred to as "FRP") inserted in a state of matching a and 22a
An annular plate-shaped electric insulating member 23 made of an electric insulating material such as
And a reamer bolt 24 in which the shaft portion 25 is press-fitted into the reamer holes 21a, 22a in a penetrating manner, a nut 27 screwed to a male screw portion 25a formed at the tip of the reamer bolt 24, and one flange 21 and the reamer bolt. An annular plate-shaped first metal washer 29 made of a metal material such as iron and an annular shape made of an electrically insulating material such as FRP, which is interposed between end faces 21b, 26a facing the head 26 of 24. The plate-shaped second washer 30 is made of the same material as the washers 29 and 30, respectively, which are inserted between the opposite end surfaces 22b and 27a of the flange 22 and the nut 27 on the other side in a pressure-fitting manner. An annular plate-shaped second metal washer 31 and a second washer 32 made of an electrically insulating material are provided. Reamed hole press-fitted portion that is a large-diameter shaft portion of the shaft portion 25 of the reamer bolt 24
Annular depressions 25c and 25d are formed at the base end of the head portion 25b and the boundary portion between the reamed hole press-fitted portion 25b and the male screw portion 25a, respectively, and the outer peripheral surface of the reamed hole press-fitted portion 25b is made of fluorine resin or the like. The electric insulating material layer 28 is formed so as to cover. The inner diameters of the first metal washer 29 and the first electric insulation washer 30 are the maximum diameter of the shaft portion 25, that is, the electric insulation layer so that the washers 29, 30 can be inserted into the shaft portion 25 of the reamer bolt 24.
28 is set to be slightly larger than the outer diameter of the reamed hole press-fitting portion 25b formed by coating, and the inner diameter of the former 29 is the same as or slightly larger than the inner diameter of the latter 30, and the outer diameter of the latter 30 is the former. It is set to be the same as the outer diameter of 29 or larger than this, as appropriate. The inner diameters of the second metal washer 31 and the second electric insulating washer 32 are slightly larger than the outer diameter of the male screw portion 25a so that the washers 31, 32 can be inserted into the male screw portion 25a of the reamer bolt 24. The inner diameter of the former 31 is set to be the same as or slightly larger than the inner diameter of the latter 32, and the outer diameter of the latter 32 is set to be the same as the outer diameter of the former 31 or appropriately larger.

Thus, the end surface of the head 26 of the reamer bolt 24, that is, the seat surface 26a.
According to the present invention, the first metal washer 29 and the first electric insulating washer 30 are bonded and held by an adhesive in a state concentric with the bolt axis. That is, as shown in FIG. 1, the first metal washer 29 is adhered to the seat surface 26a of the reamer bolt head 26, and the first electrically insulating washer 30 is attached to the end surface of the first metal washer 29. It is adhered and the reamer bolt 24 and both washers 29, 30 are integrated. By the way, between the reamer bolt head 26 and the first metal washer 29 and both washers 29, 3
The adhesive strength between the adhesives between 0 is at least to the extent that it can withstand vibration and impact when press-fitting the reamer bolts 24 into the reamer holes 21a, 22a, that is, the press-fitting work of the reamer bolts 24 is performed with both washers 29 and 30 as bolt axis lines. It is enough if it can be done in a concentric state and integrated with the reamer bolt 24. Therefore, the selection and usage amount of the adhesive can be appropriately determined within the range where such adhesive strength can be obtained.

Further, according to the second aspect of the invention, the end face of the nut 27, that is, the seating face 27a, is provided with the second metal washer 31 and the second washer 32 made of an electrically insulating material, similarly to the washers 29 and 30, with an appropriate adhesive agent. Thus, the nut axis, that is, the nut 27 is adhered and held concentrically with the bolt axis line when the nut 27 is screwed to the reamer bolt 24, and the nut 27 and both washers 31, 32 are integrated. The adhesive strength between the nut 27 and the second metal washer 31 and between the washers 31 and 32 is determined by at least the tightening work of the nut 27 while the both washers 31 and 32 are concentric with the bolt axis. As long as you can do it with 27, it is enough.

Therefore, in order to connect the shafts to be connected using the torque transmission flange joint of the ship propulsion device having the above-described structure, first, both flanges 21 and 22 are abutted against each other via the electric insulating member 23 (Fig. 1). .

Next, the shaft portion 25 of the reamer bolt 24 is in a state in which the washer 30 made of the first electrically insulating material is abutted against the end surface 21b of the one flange 21 by using a hydraulic tool or a hammer, that is, both washers 29, 30 are reamed bolts. 24 heads 26 and flanges 21
Reamed holes 21a, 22 until they can be pressed together with
Press into a through. At this time, vibration and shock occur due to press fitting, but washers 29, 30 are
Since it is integrated with the head 26 of the head and is held concentrically with the bolt axis, the washers 29, 30 may fall into the annular recess 25c to cause misalignment or damage the electric insulation layer 28. There is no such thing. Therefore, the washer 2
A state in which the shaft portion 25 of the reamer bolt 24 is sandwiched between the head portion 26 of the reamer bolt 24 and the flange 1 with both washers 29, 30 concentric with the bolt axis line without holding the 9, 30 specially. Moreover, it can be easily and satisfactorily press-fitted into the reamed holes 21a, 22a.

And finally, attach the nut 27 to the male screw part 25 of the reamer bolt 24.
The connection of the connected shaft is completed by screwing it into a and tightening it appropriately (Fig. 2). At this time, washers 3
Since 1, 32 are integrated with the nut 27, misalignment such as dropping into the annular recess 5d does not occur even if they are not particularly held. Therefore, the nut 27 can be easily and satisfactorily tightened with both washers 31, 32 being concentric with the bolt axis and being pinched between the nut 27 and the flange 22.

Thus, in the state where the connection of the connected shafts is completed in this way, as shown in FIG. 2, the metal washers 29 and 31 and the electric insulating washer 30 and 32 are concentric with the bolt axis. It is maintained, and the tightening stress of both flanges 21 and 22 by the reamer bolt 24 and the nut 27 through the washers 29 to 32 does not become high, and the stress distribution does not become uneven, so that both flanges 21 and 22 do not become uneven. 22 can be satisfactorily fastened. Moreover, keep the connected shaft in a well-insulated state without reducing the insulating effect between the reamer bolt 24 and nut 27 and the flanges 21 and 22 by the washers 30 and 32 made of electrically insulating material. You can

(Effects of the Invention) As described above, according to the first invention, the use of the reamer bolt having the annular recessed portion at the base end portion of the large-diameter shaft portion allows the flange to be abutted. It is possible to prevent the corners from damaging the shaft portion of the reamer bolt, and the torsional stress and tensile stress due to the tightening of the bolt due to the rotation of the propulsion shaft of the ship propulsion device concentrates and acts under severe conditions. It is possible to secure the safety against breakage of the reamer bolt by causing the shearing stress acting on the reamer bolt used in 1. to be received only by the large-diameter shaft portion of the reamer bolt. However, it is not necessary to hold each washer separately from the reamer bolt by adhering and holding a metal washer and an electric insulating washer to the bearing surface of the head of such a reamer bolt concentrically with the bolt axis. The press-fitting work of the reamer bolt into the reamer hole may cause misalignment of the washer even in a narrow space such as the bottom of the ship, and the washer may damage the electrical insulation layer formed on the large diameter shaft of the reamer bolt. Can be done very easily and safely without doing. Therefore, there is an effect that it is possible to extremely easily and efficiently perform shaft connection in a state where a predetermined torque transmission performance and electric insulation are secured.

Further, according to the second invention, a reamer bolt having annular recesses formed at the head proximal end portion of the large diameter shaft portion and the boundary portion between the large diameter shaft portion and the male screw portion is used,
The metal washer and the electric washer are also bonded and held on the nut seat surface in a concentric state with the nut axis to ensure safety against breakage of the reamer bolt, while each washer has a core for the nut. There is an effect that the shaft connection can be performed very easily and more efficiently without slipping off and maintaining a predetermined torque transmission performance and electric insulation.

[Brief description of drawings]

1 and 2 show an embodiment of a torque transmission flange joint for a ship propulsion device according to the present invention. FIG. 1 is a vertical sectional side view showing a disassembled state before fastening, and FIG. FIG. 3 is a vertical sectional side view showing a fastening completed state, and FIGS. 3 and 4 show a torque transmission flange joint of a conventional ship propulsion device. FIG. 3 is a vertical sectional side view showing a fastening completed state. FIG. 4 is a vertical cross-sectional side view of a part notch showing a state before completion of fastening. 21,22 ... Flange, 21a, 22a ... Reamer hole, 23 ... Electrical insulation member, 24 ... Reamer bolt, 25b ... Reamer hole press-fitted portion (shaft part), 26 ... Head, 26a ... Seat surface, 27 ... Nut, 27a ... seat,
28 ... Electrical insulation layer, 29, 31 ... Metal washer, 30, 32 ... Electrical insulation washer.

Claims (2)

[Claims] 1. A pair of flanges that are abutted against each other via an electric insulating member, and an annular recessed portion at a head base end portion of a large-diameter shaft portion that is press-fitted into reamed holes of both flanges. A reamer bolt having a shaft portion coated with an electrically insulating material, a nut screwed to the reamer bolt, a face between the head of the reamer bolt and one flange, and a face between the nut and the other flange. In an insulated flange joint for torque transmission of a ship propulsion device, which comprises a metal washer and a washer made of an electrically insulating material, which are respectively interposed between the metal washer and the electric washer on the seat surface of the head of the reamer bolt. An insulating flange joint for torque transmission of a ship propulsion device, characterized in that an washer made of an insulating material is bonded and held by an adhesive in a state of being concentric with the bolt axis. 2. A pair of flanges that abut against each other via an electrically insulating member, a head base end portion of a large-diameter shaft portion press-fitted into reamed holes of both flanges, and a boundary between the large-diameter shaft portion and a male screw portion. Of the reamer bolt, which has an annular recessed portion in each of the portions, and has the large-diameter shaft portion coated with an electric insulating material layer, a nut screwed to the reamer bolt, the head of the reamer bolt, and one flange In an insulating flange joint for torque transmission of a ship propulsion device, which comprises a metal washer and a washer made of an electrically insulating material which are respectively inserted between the facing surfaces and between the facing surfaces of the nut and the other flange, respectively, the reamer bolt of The metal washer and the washer made of an electrically insulating material are adhered to and held on the seat surface of the head by an adhesive in a state of being coaxial with the bolt axis line, and the seat surface of the nut is made of the metal washer and the electric washer. Ship propeller torque-transmitting insulating flange joint, characterized in that are an insulator washer made adhesive is held in a concentric and the nut axis by an adhesive.