JPS6023627A - Shaft joint - Google Patents

Abstract

PURPOSE:To prevent pitching caused by electric discharge corrosion in each bearing, by insulating a shaft joint to be connected between flange connection faces through reamer bolts and nuts providing an insulating washer. CONSTITUTION:A reamer bolt 6 forms its head part longer than the thickness of one of the flanges 3 to be coated with an insulating material 8, providing its another end shaft part in an external threaded part 9 for a nut to be screwed. It is the most suitable for the insulating material 8 to use synthetic resin or the like with hard quality having flexibility and corrosion resistance. The shaft part of the bolt provides a small contour, being coated with an insulating thin film in thickness of about 0.7mm. firmly melted by the method of soaking or the like. Then an insulating washer 4 is used for insulation between the flange 3 and the bolt. In this way, the insulating washer 4 and an insulating separator plate 5 are used in internal and external end faces for insulation between the mutually opposed flanges 3, 3, while the insulating material 8 is used for insulation of bolt mounting holes 10.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a shaft coupling that connects, for example, a ship's 1W advance shaft and its drive shaft together via an intermediate shaft, and more particularly relates to This invention relates to shaft couplings that insulate and connect between parts.

(B) Back research of the invention The shaft joint as described above is an extremely important joining member in a ship, and is therefore required to have high strength and high reliability. The internal drive shaft is integrally connected to the internal drive shaft via several intermediate shafts by bolts and nuts fastening the opposing flange joint surfaces of the respective shaft ends.

However, in ships that have been used in recent years, each bearing number (metal) of the main engine crankshaft for drive output inside the hull is corroded by electrical discharge, resulting in a problem that causes biting in the bearing number. This causes a reduction in the life of the bearing G.
C.O.

(c) Purpose of the Invention Therefore, the present invention aims to provide a shaft coupling that can completely eliminate corrosion by elucidating the cause of corrosion induced in the bearing of a crank 1ltl+.

(d) Summary of the invention 1 This invention provides that the cause of corrosion is an electrical closed circuit 1
For ship equipment that is subject to electrolytic corrosion based on
The effect of the invention is characterized in that it is an Ir111 joint that is insulated and joined to interrupt the electrical closed circuit. It is equipped with a reamer pole 1~, an insulating washer 17 equipped on the bolt head side, an insulating partition plate for partitioning the opposing flange joint surfaces, and a nut 1~ that corresponds to and covers the reamer pole 1~. The minimum necessary insulation bond can be obtained. By using such a joint that also has electrical insulation, it is possible to reliably interrupt electrical closed circuits induced in the ship's hull and equipment, completely eliminating the negative effects on various parts such as bearings.

In addition, in the joining operation, a joint having an insulation function can be easily obtained by the same operation as the usual fastening means using reamer poles 1 to 1 and nuts 1 to 1.

(f) Examples of the invention An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a shaft coupling 1 applied to an intermediate shaft for a ship propulsion connection, and this is an insulating washer 4 and an insulating partition between both flanges 3.3 provided at the ends of opposing intermediate shafts 2, 2. The insulating joint is made by fastening means using the reamer pole 1-6 equipped with the plate 5 and the Nara l-7, and these fastening means are equally distributed in stages in the circumferential direction of the flange 3 as is well known. Attach.

As shown in FIG. 2, the reamer pole 1-0 described above has one flange 3 having a thickness of J: the shaft part on the head side of the revolver 1 is long and covered with an insulating material 8, and the other end is covered with an insulating material 8. The shaft portion is provided in the male screw portion 9 for knot screwing.

The above-mentioned insulating material 8 is optimally made of a synthetic resin (for example, VdF) that has appropriate flexibility and resistance to corrosion. Taking this into consideration, the diameter is set to be small, and the thickness of the small diameter portion is, for example, 0.
An insulating thin film of about 7Il1m is firmly melted and adhered by a dipping method or the like. Since the insulating material 8 deposited in this manner has a high compressive strength (40 kof/mm' or more), the shearing force with respect to the poles 1 to 1 is not reduced. In addition, it is possible to set the outer diameter to the same dimension as the j-method beam-ma bolt diameter, or to set the covering part to a slightly larger diameter in consideration of adhesion to the port 1 to mounting hole 10 of the flange 3. stomach.

The above-mentioned insulating washer r4 is formed into a hollow disk shape so as to have a tight valley on the outer diameter of the reamer pole 1-6 using heat-resistant fiber IIf reinforced resin (heat-resistant FRP) with high strength and good electrical insulation. It is used on the head side of the pole 1, and when in use, the metal washer 11 is installed in 171 steps to insulate between the pole 1~the head side and the flange 3 facing it.

The above-mentioned insulating partition plate 5 is made of fiber reinforced resin (FRP) with high strength and good electrical insulation properties, and is interposed between the joint surfaces of the flanges 3.3 facing each other for insulation. Its shape is thin and thick, 1 ml 1 fi, with hole insertion holes corresponding to the reamer bolts 6 spaced in the circumferential direction, spaced equally apart in the circumferential direction. Provided in a hollow disk (degrees).

The joint configured in this way has opposing flanges 3.
3, insulate the inner and outer end surfaces of one of the flanges 3 with an insulating washer 4 and an insulating partition plate 5,
Also, for the flange bolt removal hole 10,
The insulation is provided by an insulating material 8 coated on the flanges 3, and the joints of these opposing flanges 3, 3 are completely insulated.

Therefore, when a ship is in use, the minute potential (-6001
1V), and also generates a similar micropotential (-100mV culm r!1) on the hull, and based on the potential difference between the two, it is connected to the -C ship propulsion shaft via several intermediate shafts. Although an attempt was made to construct an electrical closed circuit through the main engine crankshaft inside the hull and the hull, since this shaft joint 1 is insulated, no electrical closed circuit would occur, and the main (some crankshaft) Electrolytic corrosion of the bearing [) is prevented.

3 to 5 show other embodiments of the present invention, and FIG. 3 shows a shaft joint 31 for a flexible coupling, in which a pair of left and right flexible hollow discs is used. The packs 32, 32 are connected in a permissible manner to absorb errors in each connection body in the radial direction.

Fig. 4 shows an example applied to a shaft joint 4 for fixing a flange, and Fig. 5 shows an example applied to a gear-shaped shaft joint 51, which is applied to various types of shaft joints 31°41.51. Even in this case, the same effect as @Joint 1 of the above-mentioned embodiment can be obtained.

In the above-mentioned embodiment, the bearing inside the ship is provided to prevent electrolytic corrosion, but the present invention is not limited to this and can be applied to prevent electrolytic corrosion of other equipment and devices.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially sectional front view of a joint for marine vessel propulsion connection. Figure 2 is a front view of the main part of the insulating fastening member. 3 to 5 are longitudinal sectional views of essential parts of various shaft joints according to other embodiments of the present invention. 1.31, 41.51... Shaft coupling 4... Insulating washer 5... Insulating partition plate 6... Reamer pole 1- 7... Narrow 1-8... Insulating material Fig. 5-J Mowatoni13,'iJ2fη (Spontaneous) September 29, 1959 1 Indication of matter A 11 1982 Patent application No. 132239 2 Name of the invention Shaft coupling 3 Ministry to make amendments A'1 What relationship Patent applicant address: 2T'l11, Nonakaminami, Yodoyo-ku, Osaka City, 48th name
Nippon Biller II Nigyo Co., Ltd. 1 Representative Family Kaoru Nami (Nationality) 5 Date of amendment order I = I (Voluntary) Showa month/day (Shipping [] Showa month/day) 7 Subject of amendment (1) Details Detailed description of the invention for 8 Contents of amendment (1) Specification page 3, line 17 fl, and page 7 N+
Correct "For ship propulsion connection" on the 9th line to "For ship JII propulsion shaft connection." (2) ``Hard negative de'' on page 4, line 9 1] has been amended to ``hard negative de'' to 1'' hard negative de. (3) Correct "1-shaft joint 4" on page 6, line 18 of the same page to "shaft joint 41".

Claims (1)

[Claims] 1. The shaft part of the flanges provided at the opposing shaft ends is coated with an insulating material for a long time from Pol 1 to the head side from the thickness of one of the flanges. ~Equipped with an insulating washer on the head side and screwing a nut on the other end, the reamer bolt and nut connect the opposing flange joint surfaces, and an insulating partition plate is created between the joint surfaces. A shaft coupling configured for insulating joint 1 in a state in which it is connected.