KR20210103062A - Shaft joint coupling structure - Google Patents

Abstract

The present invention provides a shaft joint coupling structure, comprising: a first coupling; a second coupling; and an insertion member. The first coupling includes: a first body having a first insertion hole to which a driving shaft is shaft-coupled in a cylindrical shape; a first concave-convex unit formed to protrude in the axial direction from one side of the first body; and a first engagement unit in which a first groove adjacent to a first uneven unit is continuously and repeatedly formed along the circumferential direction of the first body. The second coupling includes: a second body having a second insertion hole to which a driven shaft is shaft-coupled in the cylindrical shape; a second concave-convex unit extending to protrude in the axial direction on one side of the second body facing the first engagement unit and inserted into the first concave groove; and a second engagement unit adjacent to the second concave-convex unit, in which a second concave groove into which the first concave-convex unit is inserted is continuously and repeatedly formed along the circumferential direction of the second body. The insertion member has a through hole formed in the center to extend from the first insertion hole and the second insertion hole, and is inserted between the tooth surface of the first engagement unit and the tooth surface of the second engagement unit. According to the above, the driving shaft and the driven shaft are interconnected, and a rotary force of the driving shaft is transmitted to the driven shaft. In addition to the above, vibration of the shaft is alleviated or absorbed during driving through the insertion member made of an elastic material, so that noise and damage can be prevented, and an effect that enables stable rotation can be provided.

Description

Shaft joint coupling structure

The present invention relates to a shaft joint coupling structure, and more particularly, a shaft that transmits the rotational force of the drive shaft to the driven shaft by interconnecting a drive shaft connected to a motor and a driven shaft separated from the drive shaft, and can absorb and mitigate the vibration of the shaft It relates to a joint coupling structure.

In general, a coupling structure for power transmission is used to transmit the driving force of a motor in various industrial sites, and the driving shaft connected to the motor and the driven shaft separated from the driven shaft are interconnected to transmit power from the driving shaft to the driven shaft. It is a device for transmitting power.

These types of coupling devices include flexible couplings, which are most commonly used because of their characteristics that allow errors between both axes to a certain extent and reduce vibration and shock, and rigid couplings that simply connect both axes. Coupling), oil or powder to reduce the load on the motor or power transmission system and automatically cut the connection to the driven shaft in case of overload to protect the motor or driven system, etc. There is this.

On the other hand, as an example of the technology for such a guffling device, Republic of Korea Utility Model Publication No. 20-0285920 is a motor that rotates as a rotating shaft and a connecting shaft are connected by a coupling through a key inserted inside, and one side of the coupling is cut A coupling structure for connecting a rotary shaft that forms a cutout and connects a rotary shaft and a connecting shaft by inserting a coupling bolt into a bolt groove formed on one side of the cutout, wherein a key groove is formed on the rotary shaft and the connecting shaft, respectively, and the coupling is on the inner periphery It has a fixing part cut in the width direction on the side part, and a key groove connected to the key groove is formed at the lower end of the fixing part of the coupling, and the key is inserted and fixed between each key groove for easy assembly and to prevent wear. A coupling structure for connecting a rotating shaft, characterized in that it is formed in a shape to be used, has been disclosed.

However, such a conventional coupling device has a problem in that there is a limit in alleviating or absorbing the vibration of the shaft generated during driving when the rotational force of the driving shaft is transmitted to the driven shaft, resulting in operating noise and damage to the device. there was

Korea Utility Model Publication No. 20-0285920

The present invention provides a shaft joint coupling structure capable of preventing noise and damage by not only transmitting the rotational force of the driving shaft to the driven shaft by interconnecting the driving shaft and the driven shaft, but also mitigating or absorbing vibration of the shaft during driving The purpose.

According to the present invention, a first insertion hole to which a driving shaft is shaft-coupled is formed in a cylindrical shape, a first body having a key groove formed on an inner circumferential surface of the first insertion hole, and a first body extending in an axial direction from one side of the first body, A first tooth including a plurality of first concave-convex portions formed to be spaced apart along the circumferential direction of the first body, and a plurality of first concave grooves positioned between the first concave-convex portions and formed to be spaced apart along the circumferential direction of the first body a first coupling configured to include an interlocking portion and integrally manufactured with the first body and the first engaging portion by a casting method; A second insertion hole to which a driven shaft is axially coupled is formed in a cylindrical shape, and a second body having a key groove formed on an inner circumferential surface of the second insertion hole and one side of the second body facing the first engaging portion protrude in the axial direction. a plurality of second concavo-convex portions extending to be extended and spaced apart along the circumferential direction of the second body and inserted into the first concave groove; A second couple formed to be formed so as to include a second engaging portion including a plurality of second concave grooves into which the first concave and convex portions are inserted, and the second body and the second engaging portion are integrally manufactured by a casting method. ring; It provides a shaft joint coupling structure comprising an insertion member inserted between the first meshing part and the second meshing part so as to be in contact with the first meshing part and the second meshing part.

Here, the first concave-convex portion, one surface is extended to protrude along the axial direction on one side of the first body, the other surface is in contact with the bottom surface of the second concave groove, the inner peripheral surface, the inner peripheral surface and the first connecting the outer peripheral surface The side surface is configured to be in contact with the insertion member, and the second concave and convex portion has one surface extending to protrude along the axial direction on one side of the second body, and the other surface is in contact with the bottom surface of the first groove, the inner circumferential surface and A second side connecting the inner circumferential surface and the outer circumferential surface may be configured to contact the insertion member.

The insertion member includes a cylindrical member in which a through hole is formed in a central portion along the axial direction, and an inner peripheral surface of the first and second concave-convex portions are in contact with an outer circumferential surface thereof, and a plurality of them are spaced apart from each other along the outer circumferential direction of the cylindrical member. It is formed to protrude so as to protrude, and both side surfaces in the circumferential direction may be configured to include contact members in contact with each side of the first and second concave-convex portions, respectively.

Both side surfaces of the contact member may be formed to have convex convex surfaces, and side surfaces of the first and second concave and convex portions may be formed to have concave surfaces.

The insertion member has a set gap at both ends of the end of the first concave and convex portion and the bottom surface of the first concave groove, and the end of the second concave and convex portion and the bottom surface of the second concave groove are spaced apart from each other. can be

The spacer protrusion may be formed at both ends of the contact member, respectively.

Alternatively, the spacer protrusion may be alternately formed at one end and the other end of the contact member with respect to the contact members adjacent to each other.

Furthermore, the insert is a wear-resistant synthetic resin material selected from among PTFE (Teflon, polytetrafluoroethylene), PEEK (Poly Ether Ether Ketone), polyimide (PA), PPS (Poly Phenylene Sulfide), nylon, acetal and PET (Polyethylene Terephthalate). It may be formed of any one or more materials.

The first concave-convex portion and the first concave groove are continuously and repeatedly formed along the circumferential direction of the first body, and the second concave-convex portion and the second concave groove are continuously formed along the circumferential direction of the second body. can be repeated.

The contact member may have one or a plurality of heat dissipation grooves or heat dissipation holes formed in the axial direction.

Meanwhile, the contact member may be formed such that the radius of curvature of the convex surface is smaller than the radius of curvature of the concave surface so that the separation distance from the concave surface increases toward the outside in the radial direction.

The shaft joint coupling structure according to the present invention not only transmits the rotational force of the drive shaft to the driven shaft by interconnecting the drive shaft and the driven shaft, but also mitigates or absorbs the vibration of the shaft during driving through an elastic material insertion member to reduce noise and damage can be prevented, and it can provide the effect that stable rotation is possible.

In addition, since the shaft joint coupling structure according to the present invention has a structure in which the insertion member is simply inserted between the couplings, it is easy to assemble and disassemble, and to improve workability because it is easy to disassemble for maintenance. can

In addition, since the shaft joint coupling structure according to the present invention is manufactured by casting the first coupling and the second coupling in a state in which the keyway is formed, it is possible to provide the effect of not having to perform a separate cutting operation for forming the keyway. can

In addition, the shaft joint coupling structure according to the present invention can improve workability by facilitating assembly of the insert member even if thermal deformation of the coupling occurs in a high temperature working environment.

1 is an assembled perspective view of a shaft joint coupling structure according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the shaft joint coupling structure of FIG. 1 .
3 is a side view showing a state in which the first coupling, the second coupling and the insertion member are assembled with each other in the shaft joint coupling structure of FIG. 1 .
FIG. 4 is a view showing another embodiment of the contact member of FIG. 3 .

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

First, referring to FIGS. 1 and 2 , the shaft joint coupling structure according to an embodiment of the present invention includes a first coupling 100 , a second coupling 200 , and an insertion member 300 . can be configured.

The first coupling 100 is configured such that the drive shaft 10 connected to the motor is shaft-coupled to rotate according to the rotation of the drive shaft 10 . At this time, the first coupling 100, a key groove 112 for fastening with the drive shaft 10 is formed on the outer peripheral surface along the axial direction.

The first coupling 100 may include a first body 110 and a first meshing portion 120 .

The first body 110 has a cylindrical shape and a first insertion hole 111 is formed in the center along the axial direction, and the drive shaft 10 is shaft-coupled to the first insertion hole 111 . Here, in the first body 110 , a key groove 112 is formed on an inner circumferential surface of the first insertion hole 111 .

The first engaging portion 120 is formed to extend on one side of the first body 110 facing the second coupling 200, and has a structure in which the concave-convex portion and the concave groove are continuously and repeatedly formed.

In detail, the first meshing portion 120 is configured to include a plurality of first concavo-convex portions 121 and a plurality of first concave grooves 122 . The first concavo-convex portions 121 are formed to protrude in the axial direction from one side surface of the first body 110 and are formed to be spaced apart from each other in the circumferential direction of the first body 110 .

The first concave grooves 122 are positioned between the first concave and convex portions 121 and are formed to be spaced apart from each other in the circumferential direction of the first body 110 .

Here, the first concave-convex portion 121 and the first concave groove 122 may be continuously and repeatedly formed adjacent to each other in the circumferential direction of the first body 110 as shown.

The first concave-convex portion 121 has one surface extending to protrude along the axial direction on one side of the first body 110, and the other surface is in contact with the bottom surface of the second concave groove 222 to be described later. The inner circumferential surface and the side connecting the inner circumferential surface and the outer circumferential surface are configured to be in close contact with the insertion member 300 .

In the drawings, the first groove 122 is formed to have a bottom surface perpendicular to the axial direction, and the side surface of the first uneven portion 121 and the bottom surface of the first groove 122 are formed at right angles to each other, but It is not limited to this.

The second coupling 200 is shaft-coupled to the driven shaft 20 separated from the drive shaft 10, and is connected to the first coupling 100 to apply the rotational force of the drive shaft 10 to the driven shaft ( 20) is configured to pass. Here, the second coupling 200, a key groove 212 for fastening with the driven shaft 20 is formed on the outer peripheral surface along the axial direction.

The second coupling 200 may include a second body 210 and a second meshing portion 220 . The second body 210 has a cylindrical shape and a central second insertion hole 211 is formed along the axial direction, and the driven shaft 20 is axially coupled to the second insertion hole 211 . Here, in the second body 210 , a key groove 212 is formed on an inner circumferential surface of the second insertion hole 211 .

The second meshing part 220 is formed to extend on one side of the first body 110 facing the first coupling 100 , and has a shape corresponding to the first meshing part 120 . It has a structure in which the concave-convex portion and the concave groove are continuously and repeatedly formed.

In detail, the second engaging portion 220 is configured to include second concave-convex portions 221 and second concave grooves 222 . The second concavo-convex portion is formed to protrude in the axial direction on one side of the second body 210 facing the first engaging portion 120 , and is spaced apart along the circumferential direction of the second body 210 . It is formed so as to be inserted into the first concave groove (122).

The second concave groove 222 is positioned between the second concave and convex portions 221 and is formed to be spaced apart from each other in the circumferential direction of the second body 210 .

Here, the second concave-convex portion 221 and the second concave groove 222 are adjacent to each other and are continuously and repeatedly formed along the circumferential direction of the second body 210 . And the second concave groove 222 is formed to have a bottom surface perpendicular to the axial direction.

The second concave-convex portion 221 has one surface extending to protrude along the axial direction from one side surface of the second body 210, and the other surface is in contact with the bottom surface of the first concave groove 122, and an inner circumferential surface And the second side connecting the inner peripheral surface and the outer peripheral surface is configured to be in close contact with the insertion member (300).

In the drawing, the second meshing part 220 has a shape corresponding to the first meshing part 120, and the side surface of the second concave-convex part 221 and the bottom surface of the second recessed groove 222 are formed at right angles to each other. and various shapes are possible in correspondence with the shape of the first meshing part 120 .

On the other hand, in the first coupling 100 , the first body 110 in which the keyway 112 is formed by the casting method and the first engaging portion 120 are integrally manufactured by the casting method. Similarly, the second coupling 200 is also manufactured integrally with the second body 210 and the second engagement portion 220 in which the keyway 212 is formed by the casting method by the casting method.

In other words, the first coupling 100 and the second coupling 200 are the first body 110 and the second body 210 and the first meshing part 12 in which the key grooves 112 and 212 are formed. And all of the components including the second meshing portion 220 are integrally manufactured at once by a casting method.

This is different from the method in which the existing coupling members are manufactured as a casting by a casting method and then the keyway is cut in the process of combining it with the rotating shaft in the field, the first coupling 100 and the first coupling according to the present invention 2 Coupling 200 can provide an effect of improving workability because it does not go through a separate machining process in the field.

Hereinafter, the insertion member 300 will be described.

The insertion member 300 is inserted between the first meshing part 120 and the second meshing part 220 so as to be in close contact with the first meshing part 120 and the second meshing part 220 . do.

The insertion member 300 may include a cylindrical member 310 and a contact member 320 . The cylindrical member 310 has a through hole 311 formed in the central portion along the axial direction, and the inner peripheral surface of the first concave-convex part 121 and the second concave-convex part 221 are in contact with an outer peripheral surface thereof. The cylindrical member 310 may be formed to have a set thickness, and this thickness can be designed in various ways according to the transmitted rotational force and the structures of the first coupling 100 and the second coupling 200 .

On the other hand, the through hole 311, the first insertion hole 111 and the second insertion hole 211 on the same axis corresponding to the first insertion hole 111 and the second insertion hole 211 ) and may be formed to have the same radius as

A plurality of the contact members 320 are formed to protrude to be spaced apart from each other along the outer circumferential direction of the cylindrical member 310 .

Here, both ends of the contact member 320 in the axial direction are in contact with the bottom surfaces of the first and second grooves 122 and 222, respectively.

In addition, both sides of the contact member 320 in the circumferential direction are in contact with each side of the first concave-convex portion 121 and the second concave-convex portion 221 , respectively.

On the other hand, the insertion member 300 is formed to protrude from the side of the spacer protrusion 330 to be spaced apart from each other with the first meshing part 120 and the second meshing part 220 having a set gap. may be included.

The spacer protrusion 330 is, as shown, at both ends of the end of the first concave-convex portion 121, the bottom surface of the first concave-convex portion 122, and the end of the second concave-convex portion 221 and the second The bottom surfaces of the recesses 222 are formed to be spaced apart from each other with a set gap. Here, the gap may be set so as to prevent damage and noise due to contact friction by contacting the ends of the first meshing part 120 and the second meshing part 220 when driving, and a spacer protrusion ( 330), the size of the gap is set.

The spacer protrusion 330 is formed at both ends of the contact member 320 , and the ends are in contact with the bottom surfaces of the first recess 122 and the second recess 222 .

Meanwhile, the spacer protrusion 330 may be formed on both ends of the contact member 320 .

Alternatively, the spacer protrusion 330 may be alternately formed at one end and the other end of the contact member 320 with respect to the contact members 320 adjacent to each other as shown.

The insert 300 may be formed of a wear-resistant synthetic resin material capable of absorbing abrasion resistance and vibration, and may include PTFE (Teflon, polytetrafluoroethylene), PEEK (Poly Ether Ether Ketone), polyimide (PA), and PPS (Poly Phenylene). Sulfide), nylon, acetal, and PET (polyethylene terephthalate) may be formed of any one selected material.

Referring to FIG. 3 , detailed shapes of the contact member 320 and the first concavo-convex portion 121 and the second concavo-convex portion 221 facing the contact member 320 will be described.

Referring to FIG. 3 , both side surfaces of the contact member 320 are formed to have convex convex surfaces 321 . In addition, the side surfaces of the first and second concave and convex portions 121 and 221 facing the contact member 320 are formed to have concave surfaces 1211,2211 .

This is not only to allow the contact member 320 to effectively absorb vibrations during driving, but also to increase the contact area between the first and second concave-convex portions 121 and 221 to effectively transmit rotational force.

On the other hand, the convex surface 321 and the concave surface (1211,2211) are formed to have the same radius of curvature, so that the separation distance between the convex surface 321 and the concave surface (1211,2211) is the same as shown. can

Accordingly, when the contact member 320 is driven, the convex surface 321 comes into contact with both the concave surfaces 1211,2211 of the first concave-convex portion 121 and the second concave-convex portion 221 , and thus transmits the rotational force. and vibration absorption more effectively.

4 is a view showing another embodiment of the contact member 320a, and another embodiment of the contact member 320a will be described with reference to the drawings.

First, according to the above-mentioned, the first coupling 100 and the second coupling 200 are formed of a metal material that can be cast to secure durability, and the metal material expands as the temperature rises and the shape is deformed.

In view of this, since the first and second concave-convex portions 121 and 221 are formed in a substantially sectoral shape with an outer circumferential surface longer than an inner circumferential surface as shown, the amount of thermal expansion deformation is 'coefficient of thermal expansion'. In the case of Ⅷ member length', when the temperature increases, the amount of expansion increases toward the outside in the radial direction.

This is a problem in that when the facility is installed in a high temperature environment, the amount of radially outer deformation of the first and second uneven parts 121 and 221 is relatively increased, making it difficult to assemble the inserting member 300 . cause this to occur.

Accordingly, in the present invention, the convex surface 321 and the concave surface 1211,2211 as shown in FIG. 4 in consideration of the thermal deformation of the first and second uneven portions 121 and 221. By forming the radii of curvature to be different from each other, the insertion member 300 can be easily assembled even when thermal deformation of the first concave-convex portion 121 and the second concave-convex portion 221 occurs in a high-temperature environment.

To this end, in the contact member 320a, the radius of curvature of the convex surface 321 is the concave surface so that the separation distance from the concave surfaces 1211,2211 increases (d1 > d2) toward the outside in the radial direction. It is formed to be smaller than the radius of curvature of (1211,2211).

Then, even if the first concave-convex portion 121 and the second concave-convex portion 221 are further extended in the radial direction due to thermal deformation, the convex surface 321 and the concave surface 1211,2211 are spaced apart from each other. The distance can be maintained, and through this, the assembly of the inserting member 300 is facilitated. On the other hand, the radius of curvature of the convex surface 321 may be designed in consideration of the amount of thermal expansion according to the material of the first concavo-convex portion 121 and the second concavo-convex portion 221 .

Furthermore, although not shown, the insertion member 300 may have one or a plurality of heat dissipation holes or heat dissipation grooves formed in the axial direction. The heat dissipation groove may provide an effect of preventing deformation of the insertion member 300 due to heat by dissipating heat generated during driving.

Here, the heat dissipation groove may be formed on the convex surface 321 of the contact members 320 and 320a in contact with the first coupling 100 and the second coupling 200 or on the outer peripheral surface of the cylindrical member 310, , the heat dissipation groove may be formed through the cylindrical member 310 or the contact members 320 and 320a in the axial direction. The heat dissipation groove or the heat dissipation hole can be formed in a variety of positions, numbers and sizes as long as it is possible to prevent a reduction in rotational force transmission without reducing the durability of the insertion member 300 .

Although the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: drive shaft 20: driven shaft
100: first coupling 110: first body
111: first insertion hole 112, 212: keyway
120: first interlocking portion 121: first concave-convex portion
1211,2211: concave surface 122: first groove
200: second coupling 210: second body
211: second insertion hole 220: second meshing part
221: second concave-convex portion 222: second concave groove
300: insert member 310: cylindrical member
311: through hole 320, 320a: contact member
321: convex surface 330: spaced protrusion

Claims (10)

A first insertion hole to which a driving shaft is shaft-coupled is formed in a cylindrical shape, a first body having a key groove formed on an inner circumferential surface of the first insertion hole, and a first body extending in an axial direction from one side of the first body, the first body A plurality of first concave and convex portions formed to be spaced apart along the circumferential direction, and a first meshing portion including a plurality of first concave grooves positioned between the first concave and convex portions and formed to be spaced apart along the circumferential direction of the first body a first coupling configured to be integrally manufactured with the first body and the first meshing portion by a casting method;
A second insertion hole to which a driven shaft is axially coupled is formed in a cylindrical shape, and a second body having a key groove formed on an inner circumferential surface of the second insertion hole and one side of the second body facing the first engaging portion protrude in the axial direction. A plurality of second concavo-convex portions extended to be extended and spaced apart along the circumferential direction of the second body and inserted into the first concave groove, and positioned between the second concave-convex portions and spaced apart along the circumferential direction of the second body A second couple formed to be formed so as to include a second engaging portion including a plurality of second concave grooves into which the first concave and convex portions are inserted, and the second body and the second engaging portion are integrally manufactured by a casting method. ring;
Shaft joint coupling structure comprising an insertion member inserted between the first meshing part and the second meshing part so as to be in contact with the first meshing part and the second meshing part.
The method of claim 1,
The first concave-convex portion,
One surface is extended to protrude along the axial direction to one side of the first body, the other surface is in contact with the bottom surface of the second recess, and the first side connecting the inner circumferential surface and the inner circumferential surface to the outer circumferential surface is in contact with the insertion member composed,
The second concave-convex portion,
One surface is extended to protrude along the axial direction to one side of the second body, the other surface is in contact with the bottom surface of the first groove, and the second side connecting the inner circumferential surface and the inner circumferential surface to the outer circumferential surface is in contact with the insertion member Shaft joint coupling structure, characterized in that configured.
3. The method of claim 2,
The insert member,
a cylindrical member in which a through hole is formed in the center along the axial direction, and the inner peripheral surface of the first uneven part and the inner peripheral surface of the second uneven part are in contact with an outer peripheral surface;
A plurality of the cylindrical members are formed to protrude to be spaced apart from each other along the outer circumferential direction, and both side surfaces in the circumferential direction are configured to include contact members adjacent to each side of the first and second concave and convex portions, respectively. Shaft joint coupling structure, characterized in that.
4. The method of claim 3,
Both sides of the contact member are formed to have a convex convex surface,
A shaft joint coupling structure, characterized in that the side surfaces of each of the first and second uneven portions are formed to have concave surfaces.
5. The method of claim 4,
The insert member,
At both ends, the end of the first concavo-convex portion, the bottom surface of the first concave and convex portions, and the end of the second concavo-convex portion and the bottom face of the second concave groove have a set gap and spaced protrusions are formed to protrude to be spaced apart from each other. joint coupling structure.
6. The method of claim 5,
The spacer is,
Shaft joint coupling structure, characterized in that formed at both ends of the contact member, respectively.
7. The method of claim 6,
The spacer is,
Shaft joint coupling structure, characterized in that with respect to the contact members adjacent to each other are alternately formed at one end and the other end of the contact member.
4. The method of claim 3,
The insert member,
It is a wear-resistant synthetic resin material that is made of any one material selected from PTFE (Teflon, polytetrafluoroethylene), PEEK (Poly Ether Ether Ketone), polyimide (PA), PPS (Poly Phenylene Sulfide), nylon, acetal, and PET (Polyethylene Terephthalate). Shaft joint coupling structure, characterized in that.
4. The method of claim 3,
The first concave-convex portion and the first concave groove are continuously and repeatedly formed along the circumferential direction of the first body,
The second concave-convex portion and the second concave groove are shaft joint coupling structure, characterized in that it is continuously and repeatedly formed along the circumferential direction of the second body. 5. The method of claim 4,
The contact member is
A shaft joint coupling structure, characterized in that one or a plurality of heat dissipation grooves or heat dissipation holes formed in the axial direction are formed.

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