JPH0218279B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thrust bearing device for a marine rudder shaft, which supports a rudder shaft used in a marine steering device in the thrust direction.

(Prior art) Conventionally, this type of bearing has been designed to support the bearing in the thrust direction via a bearing metal interposed between the opposing surfaces of the bearing body mounted on the deck and the bearing pedestal integrated with the rudder shaft. is being carried out.

By the way, in recent years, resin materials with self-lubricating properties to prevent seizure have been used instead of metal materials for the above-mentioned bearing metal materials. Therefore, the bearing surface is subject to severe wear, which tends to increase steering resistance.

In particular, resin materials that have been widely used in recent years have excellent lubricity, but their lack of mechanical strength, especially compressive strength, increases the creep phenomenon, which causes the center of the rudder shaft to shift. As a result, the steering resistance increases and the bearing portion is damaged, which inevitably reduces the functionality of the steering device and shortens the life of the bearing metal itself.

(Purpose of the Invention) The present invention is capable of preventing reduction in service life due to wear of bearing metal and deterioration in function of the steering device due to vibrations, distortions, and uneven loads of the ship's hull due to inclination of the rudder shaft. It is an object of the present invention to provide a thrust bearing device for a marine rudder shaft, which has a low surface pressure compared to an increase in the amount of strain and can maintain a stable low coefficient of friction over a long period of time.

(Structure of the Invention) The present invention provides a thrust bearing device for a marine rudder shaft in which a rudder shaft is rotatably supported on a bearing body mounted on a deck via a bearing pedestal. A lubricating plate coated with a lubricant is attached to the upper surface of the bearing metal body, which is divided into multiple parts, interposed between the facing surfaces of the bearing pedestal, and a cross-sectional surface is attached to the lower surface of the bearing metal body. A thrust bearing device for a marine rudder shaft interposed between the opposing surfaces of the bearing body and the bearing seat, the device comprising a plurality of spiral buffer members each made of a bent metal tape and a tape-shaped lubricant wound therein. It is characterized by

(Effects of the Invention) According to the present invention, a lubricating plate coated with a lubricant is provided on the upper surface of the bearing metal body, and a buffer member having the above structure is provided on the lower surface of the bearing metal body. Although attempts are made to induce seizure due to unbalanced loads, the lubricant on the top surface exhibits sliding properties, but since this lubricant is formed integrally with the lubricating plate, it has excellent compressive strength and wear resistance. It has a great effect.

Furthermore, the lower surface is equipped with a spiral buffer member made of a metal tape with a bent cross section and a tape-shaped lubricant wound around it, so this bent part absorbs compressive force based on unbalanced loads and always Not only can a smooth steering function be maintained, but also the life of the bearing device can be reliably extended by protecting the bearing portion and improving its durability.

Therefore, it is possible to prevent a decrease in the life of the bearing metal due to wear of the bearing metal and a decrease in the function of the steering device due to uneven loads caused by vibrations, distortions, and tilting of the rudder shaft in the hull, and to prevent an increase in the amount of compressive strain. In comparison, the surface pressure is lower, and it has the effect of maintaining a stable low coefficient of friction over a long period of time.

(Example) An example of the present invention will be described in detail below based on the drawings.

FIG. 1 shows the bearing structure of a marine steering device 1,
This steering device 1 includes a bearing main body 3 mounted on a deck 2 at the rear of the hull, a rudder shaft 4 that is rotatably supported by the bearing main body 3 and has a rudder (not shown) at the lower end, and an upper part of the rudder shaft 4. and a bearing pedestal 5 which is fixed to the bearing body 3 and placed on the upper surface of the bearing body 3.

The above-mentioned bearing main body 3 has a vertical through hole for pivotally supporting the rudder axle 4 formed in the center thereof, a cylindrical radial bearing 6 for the rudder axle 4 is mounted on the inner peripheral surface thereof, and a similar radial bearing 6 is mounted on the upper surface. An annular thrust bearing 7 is attached to the rudder shaft 4, and the lower surface is attached to the deck 2.
It is fixedly mounted on an annular fixed base 8 which is fixedly installed.

9 is packing to prevent seawater from entering.

The above-mentioned radial bearing 6 is formed of a metal material into a cylindrical shape large enough to rotatably support the rudder shaft 4, and has a lubricating resin material attached to the entire inner circumference to provide a lubricating function. A recess or through hole is appropriately formed, a resin is applied to the recess (or through hole) to provide self-lubricating properties, and the bearing body 3 is fitted onto the inner circumferential surface of the bearing body 3 via the rudder axle sleeve 10.

As a result, the circumferential surface of the rudder shaft 4 is supported in an oil-free manner.

The above-mentioned thrust bearing 7 is fitted and fixed into an annular recess 11 formed on the circumference of the upper surface of the bearing main body 3, and the above-mentioned bearing pedestal 5 is disposed opposite to the upper surface of this thrust bearing 7. The rudder shaft 4, which is integral with the bearing seat 5, is smoothly slidably supported therebetween.

That is, as shown in FIGS. 2 and 3, the thrust bearing 7 is formed into an annular shape to support the entire lower surface of the bearing pedestal 5, and is divided into sections in the circumferential direction for ease of installation and individual replacement. A lubricating plate 14 coated with a lubricant 13 is attached to the upper surface of one of the divided fan-shaped bearing metal bodies 12, and a buffer member 15 is attached to the lower surface.

As shown in FIG. 4, the above-mentioned lubricating plate 14 has a stainless steel thin plate 16 formed in a fan shape having the same shape as the bearing metal body 12, and has a large number of filling holes 17 formed therein for applying a lubricant over the entire surface of the stainless steel plate 16. A lubricant 13 having self-lubricating properties, which is a mixture of tetrafluoroethylene resin and filler such as glass fiber or carbon fiber, is adhered to the surface of the thin stainless steel plate 16, and the lubricant 13 formed in this way is A plate 14 is integrally fixed to the upper surface of the bearing metal body 12 by welding or the like.

The above-mentioned buffer member 15, as shown in FIG.
A tape-shaped lubricant 19 such as tetrafluoroethylene resin containing a tape-shaped filler is layered and wound spirally on the inside of a stainless steel band plate 18 having a V-shaped cross section. It is fitted and fixed within a fixed ring 20 protruding from the lower surface.

In other words, this buffer member 15 has a spiral shape with the acute angle part of the V-shaped cross section facing the outer surface, and when attached to the bearing metal body 12, the outer periphery of the acute angle part is engaged with the inner peripheral surface of the fixed ring 20. While the fixing ring 20 is stopped, a buffer member 15 is provided so as to protrude below the lower surface of the fixing ring 20.

In addition, as shown in FIG. 2, two or three of these buffer members 15 are attached to one divided bearing metal body 12, and these buffer members 1
5 and 15 support the bearing metal body 12 to protect it.

The above-mentioned tape lubricant 19 is provided in a spiral shape overlapping the stainless steel strip plate 18 having a V-shaped cross section, so that this tape-shaped lubricant material 19 provides a lubricating effect between the stainless steel strip plates 18 and prevents metal-to-metal bonding. Noise and wear due to friction are prevented, and the movement of this buffer member 15 is made smooth.

Reference numeral 21 denotes a hole for transporting the metal bearing body, which is designed with ease of handling such as attachment and detachment.

In the thrust bearing device for a marine rudder shaft configured as described above, when a compressive load in the vertical direction is applied to the rudder shaft 4 due to vibrations of the ship body, the buffer member 15 on the lower surface of the thrust bearing 7 exhibits a buffering function similar to a spring washer. However, in particular, for an unbalanced load in the compression direction having a certain inclination, it exerts an absorbing function according to the opposing direction, and always presents a uniform thrust bearing surface.

In addition, when the rudder shaft 4 is rotated at that time, the lubricating plate 14 on the thrust bearing surface provides a smooth sliding surface while exerting the above-mentioned buffering function, and the rudder shaft 4 is always rotated under the allowable surface pressure. I can support it.

On the other hand, the radial bearing 6, together with the thrust bearing surface, exhibits a lubrication function based on the same lubricant, and presents a smooth sliding surface with respect to the rudder shaft 4.

Note that in the above-mentioned embodiment, the buffer member 15
Although the cross section of the cross section is V-shaped, the cross section is not limited to this, but may be formed in any shape such as a bent U-shape or W-shape that provides a buffering function.

Next, experimental results for determining various characteristics of the thrust bearing device of the present invention will be shown.

Figure 6 shows the experimental results for determining the compressive characteristics.The amount of compressive strain increases with temperature and surface pressure, but
Its value is extremely small.

That is, it is recognized that the compressive deformation is slight and the bearing performance against high loads is excellent.

Furthermore, FIG. 7 shows the sliding characteristics of the thrust sliding surface, and it can be seen that a stable low coefficient of friction can be maintained even during long-term use due to the lubricating action of the lubricant embedded in the lubricating plate.

Furthermore, FIG. 8 shows the compression recovery characteristics of the buffer member 15, and although the compressive strain increases in proportion to the compressive stress, its recovery performance always shows a high recovery value, and has an excellent recovery function especially under high compressive stress. It is recognized that they can demonstrate their abilities.

In short, according to the above configuration, due to vibrations and distortions of the hull, and uneven loads due to the inclination of the rudder shaft 4,
It is possible to prevent a decrease in the lifespan due to wear of the bearing metal and a decrease in the function of the steering device 1, and the surface pressure is low compared to the increase in the amount of compressive strain, and it is possible to maintain a stable low coefficient of friction over a long period of time. There is an effect that can be achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal cross-sectional view of a main part showing a bearing structure of a marine steering device, FIG. 2 is a plan view of a thrust bearing device, and FIG. 3 is a cross-sectional view of A in FIG. - A cross-sectional view; FIG. 4 is a partially enlarged perspective view showing a lubricating plate attached to the upper surface of the bearing metal body;
Fig. 5 is an enlarged perspective view showing the buffer member attached to the lower surface of the metal bearing body, Fig. 6 is a compression characteristic diagram of the thrust bearing device, Fig. 7 is its sliding characteristic diagram,
FIG. 8 is a diagram showing its compression and decompression characteristics. 2... Deck, 3... Bearing body, 4... Rudder shaft,
5... Bearing base, 7... Thrust bearing, 12
...Bearing metal body, 13...Lubricant, 14...
... Lubrication plate, 15 ... Buffer member, 18 ... Stainless steel band plate (metal tape), 19 ... Tape-shaped lubricant.

Claims (1)

[Scope of Claims] 1. A thrust bearing device for a marine rudder shaft, in which a rudder shaft is rotatably supported on a bearing body mounted on a deck via a bearing pedestal, wherein the bearing body and its upper surface are A lubricating plate coated with a lubricant is attached to the upper surface of the bearing metal body divided into a plurality of pieces interposed between the facing surfaces of the bearing pedestal to be installed, and a cross section is bent on the lower surface of the bearing metal body. A thrust bearing device for a marine rudder shaft, which comprises a plurality of spiral buffer members each made of a metal tape and a tape-shaped lubricant wound therein, and is interposed between opposing surfaces of the bearing body and the bearing seat.