KR102444456B1 - A bearing cam follower for improving Light weight and productivity - Google Patents

Abstract

The present invention relates to a bearing cam follower with reduced weight and improved productivity. A stud is formed to be supported by being coupled to various devices, and the stud is hollow so that the stud can be inserted therein and rotates about the stud as a central axis. and a bushing formed between the stud and the outer ring to reduce friction generated when the outer ring rotates.

Description

A bearing cam follower for improving Light weight and productivity

The present invention relates to a bearing cam follower with reduced weight and improved productivity, and more particularly, because no needle roller is used therein, manufacturing is simple, so productivity is improved, and weight reduction and productivity that can be applied to a wider range of applications due to light weight are improved. It relates to a bearing cam follower.

In general, cam followers are used as follower bearings of cam mechanisms or guide rollers for linear motion, and because of their high rigidity and precision, they are used in a wide range of applications such as machine tools, industrial robots, electronic parts, and office automation equipment.

As shown in FIG. 1, the cam follower includes an outer ring formed to be rotated about the stud as a central axis, and a cage in which a plurality of needle rollers are disposed to reduce friction between the outer ring and the stud. have.

The needle roller is shaft-coupled to the cage and formed so that it can be rotated. It is located between the outer ring and the stud so that each needle roller rotates freely according to the rotation direction of the outer ring to reduce frictional force and to buffer the friction force when a load or impact force is generated. is playing a role.

However, since the cam follower using the needle roller as described above has to go through a process of inserting a plurality of needle rollers into the cage, there is a problem in that the manufacturing process is complicated and productivity is lowered.

In addition, since the needle roller is rotated in contact between the outer ring and the stud, a physical friction force is generated, and there is a problem that the lifespan varies greatly depending on the quality or wear condition of the needle roller.

An object of the present invention to solve the above problems is to provide a bearing cam follower with improved weight and productivity that can reduce frictional force generated when the outer ring rotates without using a needle roller.

Another object of the present invention is to provide a bearing cam follower with reduced weight and improved productivity that can simplify the manufacturing process by not using a needle roller and thereby improve productivity.

Another object of the present invention is to provide a bearing cam follower with improved weight and productivity that can be applied to a variety of fields and selectively use lubricating oil because parts can be replaced according to the purpose of use.

In addition, another object of the present invention can be used without supply of lubricating oil or by supplying lubricating oil inside according to the purpose of use, and when lubricating oil is supplied and used inside, low friction operation is possible even if the lubricating oil is exhausted, so that life can be improved. It is to provide a bearing cam follower with improved weight and productivity.

A bearing cam follower with improved weight and productivity of the present invention for solving the above problems includes a stud formed to be supported by being coupled to various devices, and a hollow formed so that the stud can be inserted therein, and the stud is a central axis and a bushing formed between the stud and the outer ring to reduce friction generated when the outer ring rotates.

In addition, the stud of the bearing cam follower with improved weight and productivity of the present invention is formed at one end and is threaded so that it can be combined with various devices, the support shaft is formed at the middle and the center of rotation of the bushing and the outer ring. It characterized in that it consists of a contact end forming a shaft, and a support end having a diameter larger than that of the contact end at the other end to prevent the contact end from being separated from the outer ring.

In addition, the bearing cam follower with improved weight and productivity according to the present invention further comprises a lubricating port formed at one end or the other end of the stud to supply lubricating oil to the inner surface of the bushing and the outer ring.

In addition, the bushing of the bearing cam follower with improved weight and productivity of the present invention has a solid lubricant layer formed thereon. It is characterized by reducing friction.

In addition, the weight reduction and productivity of the bearing cam follower according to the present invention is characterized in that it further comprises a fixing plate coupled to one surface of the outer ring to prevent the stud and the bushing from being separated from the outer ring.

In addition, a sealing formed on one surface and the other surface of the outer ring of the bearing cam follower with improved weight and productivity of the present invention to prevent foreign matter from penetrating into the outer ring and keeping the inside sealed, and on the outer surface of the sealing It is characterized in that it further comprises a fixing ring formed to press and fix the sealing.

As described above, according to the bearing cam follower with improved weight and productivity according to the present invention, it is possible to reduce frictional force generated when the outer ring rotates without using a needle roller.

In addition, according to the bearing cam follower with improved weight and productivity according to the present invention, the manufacturing process is simplified by not using a needle roller, thereby improving productivity.

In addition, according to the bearing cam follower with improved weight and productivity according to the present invention, since parts can be replaced according to the intended use, it can be applied to various fields and has the effect of selectively using lubricating oil.

In addition, according to the bearing cam follower with improved weight and productivity according to the present invention, it can be used without supply of lubricating oil or by supplying lubricating oil inside depending on the purpose of use, and low friction even when lubricating oil is exhausted when lubricating oil is supplied inside and used. It is possible to operate and has the effect of improving the lifespan.

1 is a perspective view showing a cam follower using a conventional needle roller.
2 is a cross-sectional view showing the internal structure of a bearing cam follower with improved weight and productivity according to the present invention.
3 is an assembly view showing the disassembled configuration of a bearing cam follower with improved weight and productivity according to the present invention.
4 is a cross-sectional view showing an internal structure in which a lubricating oil can be injected by forming an oil supply port of a bearing cam follower with improved weight and productivity according to the present invention.
5 is a perspective view showing a state in which an oil supply hole is formed at one end or the other end of the stud of the bearing cam follower with improved weight and productivity according to the present invention.

Specific features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. Prior to this, if it is determined that the detailed description of the function and its configuration related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

The present invention relates to a bearing cam follower with reduced weight and improved productivity, and more particularly, because no needle roller is used therein, manufacturing is simple, so productivity is improved, and weight reduction and productivity that can be applied to a wider range of applications due to light weight are improved. It relates to a bearing cam follower.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing the internal structure of the bearing cam follower with improved weight and productivity according to the present invention, and FIG. 3 is an assembly view showing the disassembled configuration of the bearing cam follower with improved weight and productivity according to the present invention.

2 and 3, the bearing cam follower with improved weight and productivity according to the present invention includes a stud 100 that is formed to be supported in combination with various devices, and the stud 100 is inserted therein. The outer ring 200 is formed hollow and rotated about the stud 100 as a central axis, and is formed between the stud 100 and the outer ring 200 to reduce friction generated when the outer ring 200 is rotated. It is characterized in that it includes a bushing (300).

In addition, the stud 100 is formed at one end and a screw thread 111 is formed so that the support shaft 110 is formed so as to be coupled with various devices, and is formed in the middle and the center of rotation of the bushing 300 and the outer ring 200 . It is characterized in that it consists of a contact end 120 forming a shaft, and a support end 130 that is formed at the other end with a larger diameter than the contact end 120 to prevent the contact end 120 from being separated from the outer ring 200. do.

In addition, it is coupled to one surface of the outer ring 200 and the stud 100 and the bushing 300 is characterized in that it further comprises a fixing plate 140 to prevent separation from the outer ring (200).

In addition, the bushing 300 has a solid lubricant layer formed so that when the outer ring 200 is rotated, a part of the solid lubricant layer moves to the outer surface of the stud 100 to form a low-friction supplementary film to reduce friction. do.

In addition, the sealing 400 is formed on one surface and the other surface of the outer ring 200 to prevent foreign substances from penetrating into the outer ring 200 and maintains the inside in a sealed state, and is formed on the outer surface of the sealing 400 for sealing It is characterized in that it further comprises a fixing ring 500 for pressing and fixing (400).

The stud 100 is mounted on a device to which a cam follower is used or applied and is used to support the outer ring 200 and various members, and a thread 111 is formed at one end so that it can be fixed by being coupled with various members. there will be

At this time, the stud 100 is composed of a support shaft 110 formed at one end, a contact end 120 formed at the middle end, and a support end 130 formed at the other end, and includes a support shaft 110 , a contact end 120 , and a support. The stages 130 are formed with different diameters and are formed to increase in diameter from one end to the other.

The support shaft 110 has a screw thread 111 so that it can be coupled to various devices. Accordingly, it is preferable to have a diameter corresponding to a nut or a female screw of the coupled device.

The contact end 120 is a region where the bushing 300 and the outer ring 200 are rotated to generate friction. The diameter of the contact end 120 is larger than the diameter of the support shaft 110 , and the bushing 300 used ), the diameter can be changed according to the inner diameter.

That is, after selecting the size of the outer ring 200 to be used first, the bushing 300 is selected according to the inner diameter size of the outer ring 200, and the diameter of the contact end 120 is selected to match the inner diameter of the bushing 300. preferably used.

The contact end 120 is formed in a cylindrical shaft, and when the bushing 300 is coupled to the outer surface, it is preferable to apply lubricating oil between the bushing 300 and the contact end 120 to reduce frictional force.

The support end 130 is used to prevent insertion into the inner diameter of the outer ring 200 , and is formed to have a larger diameter than the inner diameter of the outer ring 200 , so that the support shaft 110 and the contact end 120 are sequentially When the contact end 120 is positioned at the inner diameter of the outer ring 200 after being inserted into the inner diameter of the outer ring 200 and passed, the stud 100 is prevented from moving in one direction any longer.

In addition, a fixing plate 140 is formed on one surface of the outer ring 200 in the opposite direction where the support end 130 is formed to prevent the support shaft 110 from moving toward the support end 130 .

At this time, a groove digging inward along the outer diameter is formed on the outer surface of the support shaft 110 on which the fixing plate 140 is located, and a protruding ring (not shown) protruding to the outer surface is formed on the inner diameter of the fixing plate 140 , As the protruding ring of the fixing plate 140 is inserted into the groove of the support shaft 110 , the fixing plate 140 and the support shaft 110 can be coupled.

In addition, if necessary, a screw thread 111 is formed in the inner diameter of the fixing plate 140 , and a screw thread 111 is formed in a portion of the support shaft 110 adjacent to the contact end 120 to support the fixing plate 140 by screw coupling. The shaft 110 may be fixed to the outer surface.

That is, the stud 100 is not separated from the position on one surface and the other surface of the outer ring 200 by the support end 130 and the fixing plate 140, and the outer ring 200 has the contact end 120 as a reference axis. can rotate freely.

In addition, in order to allow the outer ring 200 to rotate more freely, a hollow bushing 300 is inserted into the inner diameter of the outer ring 200, and the contact end 120 is located on the inner diameter of the bushing 300, so that the bushing ( 300 ) serves as a bearing between the outer ring 200 and the contact end 120 .

At this time, the bushing 300 is formed in a cylindrical shape and has an open center so that the contact end 120 can be inserted, and the inner and outer surfaces are surface-treated to reduce friction.

The bushing 300 is formed in three layer structures, and the base is formed into a cylindrical shape using a cold rolled steel sheet SPCE grade, and then a porous bronze sintered layer is formed on the surface of the cold rolled steel sheet, and the porous bronze sintered layer upper part A solid lubricant layer is formed on the

The area in which the bushing 300 is in direct contact is reduced by the porous bronze sintered layer, and the solid lubricant layer is in contact with the gap between the porous bronze sintered layer and the bushing 300. The support end 130 and the outer ring 200 ) from the surface to the concave and convex surface to form a low-friction complementary film.

The outer ring 200, whose frictional force is reduced by the supplementary film, can be rotated more smoothly, and depending on the amount used, the thickness of the solid lubricant layer is reduced or when the porous bronze sintered layer comes to the surface, only the bushing 300 is replaced. reuse becomes possible.

In addition, the solid lubricant layer may be formed of polytetrafluoroethylene (PTFE, Teflon), and in addition to this, molybdenum disulfide (MOS ₂ ), graphite, and copper may be used to reduce the friction coefficient.

Therefore, it can be used as a dry lubrication bearing that does not separately lubricate using the solid lubricant layer, and when a separate lubrication port 150 is provided as shown in FIG. 4 , it can be used as a wet lubrication bearing.

When the oil supply port 150 is formed in the cam follower to be used as a wet lubrication bearing, frictional force is reduced by the supplied lubricating oil when the outer ring 200 is rotated and the rotation occurs. If the timing is missed, the outer ring 200 can be rotated in a state in which frictional force is reduced by the solid lubricant layer formed on the outer surface of the bushing 300 .

That is, even when the lubricant is exhausted, since the solid lubricant layer is formed on the surface of the bushing 300, the outer ring 200 can be driven with low friction even without a lubricant, thereby improving the life of the cam follower.

In addition, since the bushing 300 is formed by rolling an iron plate into a cylindrical shape, the separation end 310 is formed. When the contact end 120 is inserted into the bushing 300 through the separation end 310 , dimensional tolerance or dimensional error When the coupling is difficult due to the separation end 310 is opened, the contact end 120 can be inserted into the inner diameter of the bushing 300 .

That is, it is possible to overcome a diameter error in which the contact end 120 is inserted through the separation end 310 , and when a separate lubricant is supplied from the outside, the inner and outer surfaces of the bushing 300 through the separation end 310 . It is also possible to supply lubricating oil.

The sealing 400 and the fixing ring 500 prevent foreign substances from entering the outer ring 200 from the outside while maintaining the fixing plate 140 and the supporting plate fixed on one surface and the other surface of the outer ring 200, respectively. will play a role

At this time, the sealing 400 is preferably formed of any one of elastic rubber, synthetic resin, and urethane material to be in close contact with the outer ring 200 by compression, and the fixing ring 500 formed on the outer surface of the sealing 400 ) is preferably formed of a metal material to press the sealing 400 and not to deform the outer shape.

As a result, the sealing 400 is in close contact with the inner surface of the outer ring 200 or the edge of the fixing plate 140 to prevent foreign substances from being introduced into the outer ring 200, and the fixing ring 500 is the sealing 400 ) is pressed and in close contact with the outer ring 200 to prevent the sealing 400 from being separated from the outer ring 200 .

In addition, when lubricating oil is supplied to the inside of the bushing 300 , it is possible to prevent the lubricating oil supplied to the inside of the bushing 300 from leaking to the outside by the sealing 400 .

4 is a cross-sectional view showing an internal structure in which the oil supply port 150 of the bearing cam follower with improved weight and productivity according to the present invention is formed to inject lubricating oil, and FIG. 5 is a bearing with reduced weight and improved productivity according to the present invention. It is a perspective view showing a state in which the oil supply port 150 is formed at one end or the other end of the stud 100 of the cam follower, respectively.

4 and 5, it is formed at one end or the other end of the stud 100 of the bearing cam follower with improved weight and productivity according to the present invention to supply lubricating oil to the inner surface of the bushing 300 and the outer ring 200. It is characterized in that it further comprises a refueling port 150 that is formed to be able to.

The oil supply port 150 is used to supply lubricating oil to the bushing 300, and is preferably formed as a check valve through which the fluid is supplied only to the inside of the stud 100 so that the lubricating oil remaining inside is not discharged to the outside. , it is also possible to supply lubricating oil using a nipple instead of a check valve.

In addition, the lubricating oil injected through the oil supply port 150 may be moved into the contact end 120 along the central axis of the stud 100, and is discharged vertically toward the outer surface of the contact end 120 to the bushing 300 and Lubricating oil is discharged between the contact ends 120 to be induced to reduce frictional force.

At this time, when the separation end 310 is formed in the bushing 300 as shown in FIG. 3 , the lubricating oil supplied through the separation end 310 is introduced between the bushing 300 and the outer ring 200 so that the outer ring 200 is rotated. It can also be induced to reduce the frictional force generated when

The oil supply port 150 may be formed on the central axis of the support end 130 or may be formed on the central axis of the support shaft 110, and lubricating oil may be supplied to the place where the contact end 120 is formed no matter where it is formed. It is preferable that a passageway is provided.

When the oil supply port 150 is formed at both one end and the other end of the stud 100, there is an advantage in that the lubricant can be supplied in an advantageous direction according to the shape or position of the device to be coupled.

In addition, when forming the oil supply port 150 in the stud 100, it is preferable to form a hexagonal groove toward the inner side of the stud 100 and then to form the oil supply port 150 in the hexagonal groove, the stud 100 ), it is also possible to improve the coupling force so that the tool can be rotated by inserting the tool into the hexagonal groove.

In addition, when the oil supply port 150 is formed in the cam follower and used as a wet lubrication bearing, frictional force is reduced by the lubricating oil supplied when the outer ring 200 is rotated and the rotation occurs. If the replenishment time is missed, the outer ring 200 can be rotated in a state in which frictional force is reduced by the solid lubricant layer formed on the outer surface of the bushing 300 .

That is, even when the lubricant is exhausted, since the solid lubricant layer is formed on the surface of the bushing 300, the outer ring 200 can be driven with low friction even without a lubricant, thereby improving the life of the cam follower.

As described above, according to the bearing cam follower with improved weight and productivity according to the present invention, frictional force generated when the outer ring is rotated can be reduced without using a needle roller, and the manufacturing process is simple because a needle roller is not used. It is possible to improve productivity through this, and since it can be used by replacing parts according to the purpose of use, it can be applied to various fields and has the effect of selectively using lubricating oil.

As described above, the present invention has been described with reference to preferred embodiments, but those of ordinary skill in the art to which the present invention pertains may vary the present invention within the scope not departing from the technical spirit and scope described in the claims of the present invention. It can be modified or modified in any way. Accordingly, the scope of the present invention should be construed by the appended claims to include examples of many such modifications.

100: stud 110: support shaft
111: thread 120: contact end
130: support end 140: fixed plate
150: oil supply port 200: outer ring
300: bushing 310: separation end
400: sealing 500: fixing ring

Claims (6)

a stud formed to be supported in combination with various devices;
an outer ring formed hollow so that the stud can be inserted therein and rotating about the stud as a central axis;
a bushing formed between the stud and the outer ring to reduce friction generated when the outer ring is rotated;
the stud is
a support shaft formed at one end and having a screw thread to be coupled to various devices;
a contact end formed in the middle and forming a central axis of rotation of the bushing and the outer ring;
The other end has a larger diameter than the contact end to prevent the contact end from being separated from the outer ring; and
The bushing has a solid lubricant layer formed so that when the outer ring is rotated, a part of the solid lubricant layer moves to the outer surface of the stud to form a low-friction complementary film to reduce friction,
Further comprising; a fixing plate coupled to one surface of the outer ring to prevent the stud and the bushing from being separated from the outer ring,
a sealing formed on one surface and the other surface of the outer ring to prevent foreign matter from penetrating into the outer ring and maintaining the inside in a sealed state;
Further comprising; a fixing ring formed on the outer surface of the sealing to pressurize and fix the sealing;
The bushing is
After forming it in a cylindrical shape using a cold rolled steel sheet, a porous bronze sintered layer is formed on the surface to reduce the area in which the bushing is in direct contact and
Forming a low-friction supplementary film by forming a solid lubricant layer on the porous bronze sintered layer and moving from the surface of the support end and the outer ring in contact with the gap between the porous bronze sintered layer and the bushing to the convex surface characterized
Bearing cam follower with reduced weight and improved productivity.
delete The method of claim 1,
It characterized in that it further comprises a; oil supply port formed at one end or the other end of the stud to supply lubricant to the inner surface of the bushing and the outer ring.
Bearing cam follower with reduced weight and improved productivity.
delete delete delete

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