KR102685351B1 - Bush bearing based on composite material - Google Patents

Abstract

The present invention relates to a bush bearing based on a composite material: an internal member (20) formed in a cylindrical shape using a copper alloy and equipped with an inner groove (21) and an oil hole (23); An external member (30) formed to surround the internal member (20) with a resin material and provided with an oil supply hole (33) and an external groove (35); and an auxiliary member 40 formed integrally with the external member 30 to reinforce physical properties.
Accordingly, by simultaneously applying copper alloy and composite materials in various mechanical devices, including ship steering systems, the lubrication performance of operating parts is improved while cost and weight are reduced, so increased effectiveness can be expected through improvements in CAPEX and OPEX.

Description

Bush bearing based on composite material}

The present invention relates to a bush bearing made of composite material, and more specifically, to a bush bearing based on a composite material that reduces friction of operating parts in various mechanical devices, including ship steering systems.

A method of applying the ram movement of a hydraulic cylinder to a rudder stock supported on a rudder carrier is sometimes applied to the steering system including the rudder of a ship. It is equipped with a bush-structured bearing to reduce vibration of rotation/sliding movement and prevent wear during the ramping process. Typically, the ramping bush is made of soft copper alloy and is equipped with a passage and plug on the outer surface for injecting lubricant. However, copper alloy materials are expensive and heavy, which increases the cost of ships and reduces propulsion efficiency.

As prior art documents that can be referred to in relation to countermeasures against this, Korean Patent Publication No. 0803055 (Priority Document 1), Korean Patent Publication No. 0865070 (Priority Document 2), etc. are known.

Prior Document 1 shows that the spherical bearing that accommodates and supports the spherical journal is manufactured from fiber-reinforced composite material through orthogonal processing or resin transfer molding, thereby simplifying the manufacturing process and improving productivity, and the gap between the spherical bearing and the spherical journal is improved. The effect of maintaining the bearing gap uniformly and accurately and easily forming a self-lubricating layer with self-lubricating characteristics is expected.

Prior Document 2 includes a support member made of metal fixed to a fixture and having both ends of the upper surface inclined downward; It is formed of a carbon fiber polymer composite material layer laminated on the upper surface of the support member and a coating layer formed on the upper surface of the carbon fiber polymer composite material layer. Accordingly, the effect is expected to protect the surface of the main shaft in the rotating body, reduce friction, and prevent deformation due to high loads.

However, according to the above-mentioned prior literature, there is room for improvement in that consideration of the marine/vessel environment is insufficient.

Korean Patent Publication No. 0803055 “Manufacturing apparatus and method of spherical bearing assembly” (Publication date: 2008.02.18.) Korean Patent Publication No. 0865070 “Hybrid composite shoulder bearing and its manufacturing method and… system” (Publication date: 2008.10.24.)

The purpose of the present invention to improve the conventional problems described above is to develop a composite product that can be applied based on two or more materials in various mechanical devices, including ship steering systems, to reduce cost and weight while improving the lubrication performance of the operating part. The goal is to provide material-based bush bearings.

In order to achieve the above object, the present invention provides a bush bearing based on a composite material: an internal member formed in a cylindrical shape using a copper alloy and equipped with an inner groove and an oil hole; an external member formed to surround the internal member with a resin material and having an oil supply hole and an external groove; and an auxiliary member integrally formed on the external member to reinforce physical properties.

According to the detailed configuration of the present invention, the inner member and the outer member are characterized in that their respective outer surface grooves and protrusions are engaged to increase coupling force.

According to the detailed configuration of the present invention, the external member is a composite resin containing ethylene tetrafluoride (PTFE), molybdenum disulfide (MoS ₂ ), and graphite, and is further provided with an oil supply hole on the outer surface groove of the closed structure. Do it as

According to the detailed configuration of the present invention, the auxiliary member is characterized in that it is provided with a fiber filler and a particle filler to increase self-lubrication in at least some areas of the external member.

As a modified example of the present invention, the auxiliary member is characterized by further comprising a corrosion prevention layer for increasing corrosion resistance and an expansion prevention layer for suppressing expansion and contraction in at least some areas of the external member.

As described above, according to the present invention, copper alloy and composite materials are simultaneously applied to various mechanical devices, including ship steering systems, to improve lubrication performance of operating parts while reducing cost and weight, so it is expected to increase effectiveness through improvement in CAPEX and OPEX. .

1 is a configuration diagram showing an example of use of the bush bearing according to the present invention.
Figure 2 is an exploded configuration diagram of the bush bearing according to the present invention.
Figure 3 is a configuration diagram showing the main parts of the bush bearing according to the present invention

Hereinafter, embodiments of the present invention will be described in detail based on the attached drawings.

The present invention proposes a bush bearing based on composite materials. It targets, but is not necessarily limited to, bush bearings that reduce friction in operating parts in various mechanical devices, including ship steering systems. Composite material refers to two or more materials with different physical properties.

Referring to FIG. 1, a device that converts the linear motion of the drive ram 10 into the rotational motion of the driven shaft 16 is illustrated. The driving ram 10 may be connected to the piston of the hydraulic cylinder, and the driven shaft 16 may be connected to the rudder stock of the ship's rudder. The driving ram 10 has a movable pin 12 on one side, and the driven shaft 16 has a yoke 14 at its end. A bush bearing is installed between the movable pin (12) and the yoke (14). In this case, the bush bearing performs linear motion on the yoke (14) while supporting the rotational motion of the movable pin (12).

According to the present invention, an internal member 20 formed in a cylindrical shape using a copper alloy has a structure equipped with an inner groove 21 and an oil hole 23.

Referring to FIGS. 2 and 3, the inner member 20 as well as the inner groove 21 and the oil supply hole 23 that make up the inner member 20 are shown. The internal member 20 is formed in a cylindrical shape of copper alloy to rotatably support the movable pin 12 of the driving ram 10. The internal member 20 may be formed of an alloy containing copper, zinc, nickel, tin, manganese, and aluminum in consideration of fatigue strength, wear resistance, and corrosion resistance. The inner groove 21 has a roughly semicircular cross section and is formed in a lattice shape with closed ends. The closed structure of the inner groove 21 is to prevent leakage of filled grease (not shown). The oil supply hole 23 is formed to penetrate radially at a plurality of points on the inner groove 21 to allow grease to enter and exit.

In addition, according to the present invention, the external member 30 formed to surround the internal member 20 with a resin material has a structure including an oil supply hole 33 and an external groove 35.

2 and 3, the external member 30, as well as the oil supply hole 33 and the external groove 35 that make up the external member 30, are shown. The outer member 30 is preferably made of a resin material to partially replace the expensive and heavy inner member 20 of copper alloy. That is, the bush bearing is composed of a composite material of the internal member 20 and the external member 30. The outer surface groove 35 can be formed limited to two side surfaces (sliding surfaces) in contact with the yoke 14. The oil supply hole 33 can be formed on two sides (non-sliding surface) that are not in contact with the yoke 14. The oil hole (33) and the external groove (35) are parts where grease enters and is filled.

According to the detailed configuration of the present invention, the inner member 20 and the outer member 30 are engaged with each other through outer surface grooves 25 and protrusions 31 to increase coupling force.

2 and 3, the outer surface groove 25 of the inner member 20 and the protrusion 31 of the outer member 30 are shown. Even if high loads and impacts occur while the bush bearing is in operation, the inner member 20 and the outer member 30 are maintained in a tight coupling state. The outer surface groove 25 and the protrusion 31 are not limited to a continuous shape and may be formed intermittently. The cross section of the outer surface groove 25 and the protrusion 31 may be trapezoidal rather than rectangular or square. In mass production, the inner member 20 and the outer member 30 are manufactured using an insert molding method. Of course, it is also possible to form the external member 30 into a divided structure and fasten it.

Meanwhile, although omitted in the illustration, the protrusion 31 protruding from the inner surface of the external member 30 can be reinforced by embedding carbon fiber fabric therein. Carbon fiber fabric can also have a mesh structure.

According to the detailed configuration of the present invention, the external member 30 is a composite resin containing ethylene tetrafluoride (PTFE), molybdenum disulfide (MoS ₂ ), and graphite, and has an oil supply hole on the outer surface groove 35 of a closed structure. It is characterized by further comprising (33).

In Figure 2, an oil supply hole 33 and an external groove 35 appear along with the external member 30. The external member 30 of ethylene tetrafluoride (PTFE), molybdenum disulfide (MoS ₂ ), and graphite ensures the low friction coefficient, wear resistance, lubricity, and heat resistance required for bush bearings. Additives such as molybdenum disulfide (MoS ₂ ) and graphite are mixed with ethylene tetrafluoride (PTFE) powder and melted and molded. In addition, depending on the physical properties of the bush bearing, additives such as tungsten disulfide (WS ₂ ), carbon black, and glass fiber can be used. The closed structure of the outer groove 35 can be maintained identical to the inner groove 21 of the inner member 20 described above. If the oil supply hole 33 formed in the outer groove 35 is configured to communicate with the oil supply hole 23 in the inner groove 21, it is advantageous for cooling the grease and increases the convenience of replenishment work.

Although grease is used in the bush bearing of the present invention, it can basically be operated in a non-lubricated operation state.

Meanwhile, a plug (not shown) may be installed in at least some of the oil supply holes 33 provided in the external member 30 to replenish grease from the outside.

In addition, according to the present invention, the auxiliary member 40 is formed integrally with the external member 30 to reinforce physical properties.

In Figure 1, a state in which the auxiliary member 40 is configured on the external member 30 is illustrated. The auxiliary member 40 reinforces physical properties such as low friction coefficient, wear resistance, lubrication, and heat resistance required for bush bearings. In particular, in bush bearings mounted on ships, reinforcement of physical properties has a significant impact on operational reliability and durability. In the steering system including the rudder, bush bearings, movable pins (12), yokes (14), etc. are greatly affected by seawater. The outer member 30 is non-conductive and helps block or delay corrosion of the inner member 20.

According to the detailed configuration of the present invention, the auxiliary member 40 is characterized by providing a fiber filler 41 and a particle filler 42 to increase self-lubrication in at least a partial area of the external member 30.

In Figure 2, the fiber filler 41 and the particle filler 42 constituting the auxiliary member 40 are shown. The relative content of the fiber filler 41 and the particle filler 42 may be increased on the sliding surface of the external member 30. The fiber filler 41 is selected from carbon fiber, glass fiber, aramid fiber, and ceramic fiber. The particle filler 42 is selected from graphite particles, molybdenum disulfide particles, tungsten disulfide particles, and boron nitride particles. The average diameters of the fiber filler 41 and the particle filler 42 are maintained in a similar range, and it is recommended that they be mixed in a range of 10 to 25 wt based on the total weight of the external member 30.

As a modified example of the present invention, the auxiliary member 40 further includes a corrosion prevention layer 44 for increasing corrosion resistance and an expansion prevention layer 46 for suppressing expansion and contraction in at least some areas of the external member 30. It is characterized by

In Figure 2, the corrosion prevention layer 44 and the expansion prevention layer 46 added to the auxiliary member 40 are shown. The corrosion prevention layer 44 is formed on the surface of the non-gliding surface exposed to the outside air in the bush bearing. The anti-corrosion layer 44 is formed by adding a ceramic coating with excellent salt resistance before and/or after molding the external member 30. The anti-expansion layer 46 is formed on the inner area of the non-gliding surface of the bush bearing. The anti-stretch layer 46 is formed by impregnating the fiber matrix with phenol resin and is inserted (inserted) before molding the external member 30. Excellent dimensional stability is maintained with low water swelling properties due to the anti-expansion layer (46). The corrosion prevention layer 44 and the expansion prevention layer 46 can be selectively applied to the non-gliding surface.

The present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the present invention. Therefore, it should be said that such variations or modifications fall within the scope of the patent claims of the present invention.

10: driving ram 12: movable pin
14: Yoke 16: Driven shaft
20: Internal member 21: Inner groove
23: Oil hole 25: External groove
30: External member 31: Protrusion
33: Oil hole 35: External groove
40: Auxiliary member 41: Fiber filler
42: particle filler 44: anti-corrosion layer
46: Anti-stretch layer

Claims (5)

For bush bearings based on composite materials:
An internal member (20) formed in a cylindrical shape using a copper alloy and equipped with an inner groove (21) and an oil hole (23);
An external member (30) formed to surround the internal member (20) with a resin material and provided with an oil supply hole (33) and an external groove (35); and
A bush bearing based on a composite material, comprising: an auxiliary member (40) integrally formed on the external member (30) to reinforce physical properties. In claim 1,
A bush bearing based on a composite material, characterized in that the inner member 20 and the outer member 30 engage their respective outer surface grooves 25 and protrusions 31 to increase coupling force. In claim 1,
The external member 30 is a composite resin containing ethylene tetrafluoride (PTFE), molybdenum disulfide (MoS ₂ ), and graphite, and further includes an oil supply hole 33 on the outer surface groove 35 of a closed structure. Bush bearings based on characteristic composite materials. In claim 1,
The auxiliary member (40) is a bush bearing based on a composite material, characterized in that it is provided with a fiber filler (41) and a particle filler (42) to increase self-lubrication in at least some areas of the outer member (30). In claim 1,
The auxiliary member 40 is based on a composite material, characterized in that it is further provided with a corrosion prevention layer 44 for increasing corrosion resistance and an expansion prevention layer 46 for suppressing expansion and contraction in at least some areas of the external member 30. Bush bearing.

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