WO2021040291A1 - Center aligning device, and linearly moving apparatus including same - Google Patents

Center aligning device, and linearly moving apparatus including same Download PDF

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Publication number
WO2021040291A1
WO2021040291A1 PCT/KR2020/010786 KR2020010786W WO2021040291A1 WO 2021040291 A1 WO2021040291 A1 WO 2021040291A1 KR 2020010786 W KR2020010786 W KR 2020010786W WO 2021040291 A1 WO2021040291 A1 WO 2021040291A1
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WO
WIPO (PCT)
Prior art keywords
bearing
body member
center
ball screw
center matching
Prior art date
Application number
PCT/KR2020/010786
Other languages
French (fr)
Korean (ko)
Inventor
이종기
Original Assignee
이종기
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Publication date
Application filed by 이종기 filed Critical 이종기
Priority to JP2022512741A priority Critical patent/JP7371229B2/en
Priority to CN202080058270.1A priority patent/CN114270669A/en
Publication of WO2021040291A1 publication Critical patent/WO2021040291A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2285—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rings engaging the screw shaft with the inner perimeter, e.g. using inner rings of a ball bearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/02—Gearboxes; Mounting gearing therein
    • F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings

Definitions

  • the present invention relates to a center matching device and a linear motion device including the same.
  • Ball screw is a core part of linear motion device such as position control and direction change in various automation facilities, and is widely used in the whole industry.
  • a screw is formed around the outer periphery of the ball screw.
  • a ball nut is attached to the ball screw.
  • Both ends of the ball screw were processed and connected to a bearing, a motor shaft, and the like. At this time, due to the difficulty of machining at both ends and the difference in machining quality, the center of the machined part and the center of the screw did not exactly match, resulting in uneven rotational quality of the ball screw.
  • the present invention provides a technology for improving rotational quality and enabling high-speed rotation by matching the center of rotation of a ball screw of a linear motion device and a center of a bearing.
  • the center matching device is installed on an inner ring of a bearing through which a ball screw passes, and matches the center of the bearing with the center of the screw bone of the ball screw, and the inside is penetrated along the length direction and the And a body member coupled to the inner ring, and a center matching member positioned inside the body member and at least partially positioned at the screw valley.
  • the inner circumference of the body member is opened from the inside to one side and a clearance guide groove in which the center matching member is located is formed, and a plurality of the center matching member and the clearance guide groove are formed along the circumferential direction of the body member. Can be.
  • the clearance guide groove is formed in a cylindrical shape in the longitudinal direction of the ball screw, and the clearance guide groove may surround 2/3 of the center matching member.
  • the center matching member may include a steel ball.
  • the center matching device may include a body pressurizing member through which the ball screw passes and presses the side surface of the body member in contact with the side surface of the bearing, and a fastening means that is fastened to the body pressurizing member to engage the threaded bone of the ball screw.
  • the body pressing member has a fastening hole through which the fastening means is fastened, the fastening hole is formed in plural along the length direction of the ball screw, and the center interval of the adjacent fastening hole is adjacent to the screw valley of the ball screw. It can be the same as the center of
  • the center of the clearance guide groove may be spaced apart from the center of the body member, and the centers of the clearance guide groove may be the same distance apart from the center of the body member.
  • the plurality of clearance guide grooves may have the same or different depths based on one side surface of the body member.
  • a linear motion device includes a ball screw, a fixed end unit that supports one end of the ball screw so as to rotate, a support end unit that supports the other end of the ball screw so as to rotate, and the ball A drive motor that is power-connected to one end of the screw, a base that supports the fixed end unit and the support end unit, and a table that is power-connected to the ball screw through a ball nut and moves along the base.
  • Each of the fixed end unit and the support end unit may include a center matching device described above.
  • the fixed end unit further includes a fixed end housing having a first bearing space and a second bearing space formed therein, a first bearing disposed in the first bearing space, and a second bearing disposed in the second bearing space.
  • Can include.
  • the ball screw passes through the body member and the pressing member of the center matching device, and the inside of the first bearing and the second bearing, and a locking protrusion through which the first bearing is caught may be formed in the fixed end housing.
  • the body member is located inside the second bearing, the outer circumference of the body member is in contact with the inner ring of the second bearing, one side surface is in contact with the first bearing, and the pressing member is a side surface of the inner ring of the second bearing And contacting the other side of the body member, and the body member may be fixed between the pressing member and the first bearing.
  • the support end unit may further include a support end housing having a third bearing space formed therein, and a third bearing disposed in the third bearing space.
  • the body member of the center matching device is located inside the third bearing, the outer circumference of the body member is in contact with the inner ring of the third bearing, and the pressing members of the center matching device are provided on both sides of the third bearing. It can be in contact with both sides of the body member.
  • the center of the ball screw and the center of rotation of the second bearing and the third bearing are matched by the center matching member and the body member of the center matching device, so that the ball screw can stably rotate.
  • FIG. 1 is a schematic diagram showing a linear motion device according to an embodiment of the present invention.
  • Figure 2 is an enlarged view showing the fixed end unit of Figure 1;
  • FIG. 3 is an enlarged view of part A of FIG. 2.
  • Figure 4 is an exploded cross-sectional view of the fixed end unit of Figure 2;
  • Figure 5 is an exploded view of the center matching device and the ball screw of Figure 4;
  • the center matching device according to the embodiment of the present invention can be applied to the linear movement device according to the embodiment of the present invention.
  • a linear movement device to which the center matching device is applied will be mainly described.
  • FIG. 1 is a schematic diagram showing a linear motion device according to an embodiment of the present invention
  • FIG. 2 is an enlarged view showing the fixed end unit of FIG. 1
  • FIG. 3 is an enlarged view of part A of FIG. 2
  • FIG. 4 is 2 is an exploded cross-sectional view of the fixed end unit
  • FIG. 5 is an exploded view of the center matching device and the ball screw of FIG. 4.
  • the linear motion device 1 includes a base 10, a ball screw 20, a drive motor 30, a table 40, a fixed end unit 50, and a support end unit 60. ), and the fixed end unit 50 and the support end unit 60 include center matching devices 54 and 63, respectively.
  • the linear motion device 1 matches the center of the screw shaft of the ball screw 20 with the center of rotation of the bearing through the center matching device 54 to increase the rotational quality of the ball screw and enable high-speed rotation.
  • the base 10 has a predetermined length, a fixed end unit 50 is disposed on one side and a support end unit 60 is disposed on the other side.
  • the ball screw 20 is disposed along the length direction of the base 10 so that one end is rotatably supported by the fixed end unit 50 and the other end is rotatably supported by the supporting end unit 60. One end of the ball screw 20 protrudes through the fixed end unit 50. A screw is formed around the outer periphery of the ball screw 20.
  • the screws of the ball screw 20 are multi-threaded screws. The number, diameter, and length of the screw thread of the ball screw 20 may be variously changed according to the design of the linear motion device 1.
  • the driving motor 30 is disposed on one side of the base 10 and is connected to one end of the ball screw 20 protruding from the fixed end unit 50 through a known coupler 31. With the power of the driving motor 30, the ball screw 20 can rotate while being supported by the fixed end unit 50 and the support end unit 60.
  • the table 40 faces the base 10 with the ball screw 20 interposed therebetween, and is connected to the base 10 through a guide rail and a guide block.
  • the table 40 is connected to the ball screw 20 through a ball nut 41.
  • the ball nut 41 may move along the length direction of the ball screw 20 when the ball screw 20 rotates, and at this time, the table 40 may move on the base 10 along the guide rail.
  • the detailed configuration of the base 10, the ball screw 20, the drive motor 30, and the table 40 is a linear motion device previously filed by the present applicant (Korean Patent Registration No. 10-1648808). Since the configuration may be applied, a detailed description will be omitted below.
  • the fixed end unit 50 includes a fixed end housing 51, a first bearing 52 and a second bearing 53 together with a center matching device 54.
  • the first bearing 52 includes a thrust bearing
  • the second bearing 53 includes a radial ball bearing.
  • the first bearing and the second bearing are not limited to thrust bearings and radial ball bearings.
  • the ball screw 20 passes through the first bearing 52 and the second bearing 53.
  • the fixed end housing 51 is fixed to the upper surface of the base 10 and protrudes upward and penetrates the inside. Inside the fixed end housing 51, a first bearing space 51a in which the first bearing 52 is located and a second bearing space 51b in which the second bearing 53 is located are formed. The first bearing space 51a and the second bearing space 51b are connected. Here, the circumferential diameter of the second bearing space 51b is larger than the circumferential diameter of the first bearing space 51a.
  • the first bearing space 51a and the second bearing space 51b are formed to be symmetrical left and right with respect to the center of the fixed end housing 51.
  • the first bearing space 51a has a locking projection 511 through which the first bearing 52 is caught, and the first bearing 52 is fixed around the locking projection 511 and the first bearing space 51a.
  • the outer surface of the wheel is tightly attached and caught.
  • the fixing wheel of the first bearing 52 is separated from the circumference of the ball screw 20, and the rotating wheel is in contact with the circumference of the ball screw 20.
  • the inner ring of the second bearing 53 is in contact with the rotating wheel of the first bearing 52.
  • the center matching device 54 includes a body member 541 and a center matching member 542, and is located between the second bearing 53 and the ball screw 20, and the center of the screw bone of the ball screw 20 And the rotation center of the second bearing 53 are matched.
  • the body member 541 is formed in a cylindrical shape and is located between the ball screw 20 and the inner ring of the second bearing 53.
  • the outer circumference of the body member 541 is in contact with the inner circumference of the inner ring of the second bearing 53.
  • the inner circumference of the body member 541 faces the outer circumference of the ball screw 20.
  • the outer circumference of the ball screw 20 and the inner circumference of the body member 541 are in contact. Accordingly, the body member 541 may rotate along the ball screw 20 together with the inner ring of the second bearing 53.
  • the outer circumference of the ball screw 20 and the inner circumference of the body member 541 may be separated.
  • the body member 541 and the ball screw 20 are connected through the center matching member 542.
  • a clearance guide groove 541a is formed in the body member 541.
  • the clearance guide groove 541a is formed inside from one side of the body member 541.
  • the clearance guide groove 541a is formed in a predetermined length on one side of the body member 541 along the length direction of the ball screw 20 without penetrating the body member 541 and has a circular circumference.
  • the clearance guide groove 541a is open to one side of the body member 541 and the inner circumference thereof.
  • One side surface of the body member 541 in which the clearance guide groove 541a is opened is in contact with the rotating wheel of the first bearing 52.
  • a plurality of clearance guide grooves 541a are formed at equal intervals along the circumferential direction of the body member 541. The centers of the clearance guide grooves 541a are separated from the center of the body member 541, and at this time, the distance L is the same.
  • the clearance guide grooves 541a are shown to have the same depth h with respect to one side surface of the body member 541.
  • the depth of the clearance guide groove 541a is formed differently according to the number of spiral lines of the ball screw 20 based on one side of the body member 541 as shown in FIG. 6.
  • the depth h of the clearance guide grooves 521a is based on one side of the body member 541.
  • the gap guide grooves facing each other are paired to have the same depth (h) with respect to one side of the body member 541.
  • the depth (h) of the clearance guide groove coinciding with the second helix line is formed deeper with respect to one side surface of the body member 541 than the depth (h) of the clearance guide groove coincides with the first spiral line.
  • the depth h of the clearance guide groove can be variously changed according to the number of spiral lines of the ball screw 20 to which the center matching device is applied.
  • the center matching member 542 includes a steel ball.
  • the center matching member 542 is positioned at each of the clearance guide grooves 541a and is located at the end of the clearance guide groove 541a. However, the center matching member 542 may be separated from the end of the clearance guide groove 541a.
  • One side of the body member 541 is blocked while being in contact with the rotating wheel of the first bearing 52, so that the center matching member 542 located in the clearance guide groove 541a does not deviate from the clearance guide groove 541a.
  • the center matching members 542 are located at the same place with respect to one side of the body member 541.
  • the central integral member located in the first spiral row and the second spiral row The integrated central member located at is located in another place with respect to one side of the body member 541.
  • the circumference of the clearance guide groove 541a surrounds 2/3 of the circumference of the center matching member 542, and 1/3 of the circumference is located in the screw valley of the ball screw 20. Accordingly, at least a portion of the center matching member 542 protrudes from the body member 541 in the direction of the ball screw 20. The protruding portion of the center matching member 542 is in contact with the circumference of the screw bone. Accordingly, the center matching member 542 may be caught in the screw bone.
  • the center matching member 542 serves as a key between the ball screw 20 and the body member 541. Accordingly, when the ball screw 20 rotates, the body member 541 may rotate along the ball screw 20.
  • the center matching member 542 contacts the screw bone and the outer circumference of the body member 541 is in contact with the inner ring of the second bearing 53, the center of the screw bone and the rotation center of the second bearing 53 coincide. Accordingly, the body member 541 rotates along the ball screw 20 by the center matching member 542.
  • the ball screw 20 can stably rotate. Accordingly, the ball nut 41 can stably move on the ball screw 20.
  • the center matching device 54 may further include a body pressing member 543 and a fastening means 544.
  • the body pressing member 543 presses the body member 541 so that one side of the body member 541 is in close contact with the rotating wheel of the first bearing 52.
  • the body pressing member 543 surrounds the circumference of the ball screw 20 and is in contact with the inner ring of the second bearing 53 and the other side of the body member 541.
  • the body pressing member 543 is exposed to the outside of the fixed end housing 51.
  • the body pressing member 543 rotates along the ball screw 20.
  • the body pressing member 543 has a fastening hole 543h, and the fastening hole 543h penetrates from the outer circumference of the body pressing member 543 in the inner circumferential direction.
  • a plurality of fastening holes 543h are formed at intervals along the length direction of the body pressing member 543. The center spacing of the adjacent fastening holes 543h coincides with the center of the adjacent screw valley of the ball screw 20.
  • the fastening means 544 includes a tanning bolt, and is fastened to the fastening hole 543h. Since the center of the fastening hole 543h coincides with the center of the screw bone, the end of the fastening means 544 is located in the screw bone and is in contact with the circumference of the screw bone. The body pressing member 543 is fixed without moving in the ball screw 20 by fastening the fastening means 544.
  • the body pressing member 543 may rotate based on the center of the ball screw 20. At this time, since the end of the fastening means 544 is located in the screw bone and moves along the screw bone, the body pressing member 543 can gradually press the inner ring of the second bearing 53 and the other side of the body member 541 while rotating. have.
  • the body pressing member 543 is pressing the second bearing 53 and the body member 541 and the fastening means 544 is completely fastened, the body pressing member 543 is the second bearing 53 And the body member 541 is fixed to the ball screw 20 while pressing the body member 541. Accordingly, the body member 541 may be fixed without moving between the first bearing 52 and the body pressing member 543.
  • the support end unit 60 includes a support end housing 61 and a third bearing 62 together with a centering device 63.
  • the third bearing 62 has the same configuration as the second bearing 53.
  • the support end housing 61 faces the fixed end housing 51 and has a third bearing 62 disposed therein.
  • the center matching device 63 includes the body pressing members 633a and 633b and the fastening means 634 as a pair while including the center matching device 63 of the fixed end unit as it is.
  • the body member 631 is located between the ball screw 20 and the inner ring of the third bearing 62, and the center matching member 632 is located inside the body member 631 so that at least a portion of the body member 631 is located in the screw valley.
  • the body pressing members 633a and 633b are disposed on both left and right sides based on the body member 631 and are in contact with the inner ring of the third bearing 62.
  • the body pressing members 633a and 633b are fixed to the other end of the ball screw 20 with a fastening means 634.
  • the center of the thread of the other end of the ball screw 20 and the center of rotation of the third bearing 62 may be matched.
  • Components of the center matching device 63 of the support end unit 60 are the same as those of the center matching device 54 of the fixed end unit 50 of the above-described embodiment, and thus a duplicate description will be omitted.

Abstract

The present invention is installed on an inner race of a bearing, through which a ball screw passes, and aligns the center of the bearing and the center of a root of the ball screw, and comprises: a body member which is coupled to the inner race and of which the inside is penetrated in the longitudinal direction; and a center aligning member positioned inside the body member such that at least a portion thereof is positioned in the root. A clearance guide groove, which is open to one side from the inside and in which the center aligning member is positioned, is provided in the inner circumference of the body member. The center aligning member and the clearance guide groove are formed in plurality along the circumferential direction of the body member.

Description

중심 일치 장치 및 이를 포함하는 직선운동 장치Center matching device and linear motion device including the same
본 발명은 중심 일치 장치 및 이를 포함하는 직선운동 장치에 관한 것이다.The present invention relates to a center matching device and a linear motion device including the same.
볼스크류는 각종 자동화설비에서 위치제어, 방향전환 등 직선운동장치를 이루는 핵심부품이며 산업전반에 널리 쓰인다. 볼스크류의 외부 둘레에는 나사가 형성되어 있다. 볼스크류에는 볼너트가 결합되어 있다.Ball screw is a core part of linear motion device such as position control and direction change in various automation facilities, and is widely used in the whole industry. A screw is formed around the outer periphery of the ball screw. A ball nut is attached to the ball screw.
상기 볼스크류의 양단을 가공하여 베어링, 모터축 등과 연결하였다. 이때 양단의 가공 어려움과 가공품질의 차이로 가공 부위의 중심과 나사의 중심이 정확하게 일치하지 못하여 볼스크류의 회전품질이 고르지 못한 현상이 빈번하였다.Both ends of the ball screw were processed and connected to a bearing, a motor shaft, and the like. At this time, due to the difficulty of machining at both ends and the difference in machining quality, the center of the machined part and the center of the screw did not exactly match, resulting in uneven rotational quality of the ball screw.
이에, 볼스크류와 베어링, 모터축 등을 보다 완벽하게 결합하고 중심들을 일치시키기 위해서는 볼스크류와 베어링, 모터축이 설치되는 부위의 결합구조가 개선되어야 할 여지가 있다.Accordingly, in order to more completely couple the ball screw, bearing, and motor shaft and match the centers, there is room for improvement in the coupling structure between the ball screw, bearing, and motor shaft.
본 발명은 직선운동장치의 볼스크류 회전 중심과 베어링의 중심을 일치시켜 회전품질을 높이고 고속회전이 가능하게 하는 기술을 제공한다.The present invention provides a technology for improving rotational quality and enabling high-speed rotation by matching the center of rotation of a ball screw of a linear motion device and a center of a bearing.
본 발명의 한 실시예에 따른 중심 일치 장치는, 볼스크류가 관통하는 베어링의 내륜에 설치되어 상기 베어링의 중심과 상기 볼스크류의 나사골 중심을 일치시키는 것으로, 내부가 길이 방향을 따라 관통되어 있고 상기 내륜과 결합되는 몸체부재, 그리고 상기 몸체부재의 내부에 위치하여 적어도 일부분이 상기 나사골에 위치하는 중심 일치 부재를 포함한다.The center matching device according to an embodiment of the present invention is installed on an inner ring of a bearing through which a ball screw passes, and matches the center of the bearing with the center of the screw bone of the ball screw, and the inside is penetrated along the length direction and the And a body member coupled to the inner ring, and a center matching member positioned inside the body member and at least partially positioned at the screw valley.
상기 몸체부재의 내부 둘레에는 내부에서 일측면으로 개방되어 있고 상기 중심 일치 부재가 위치하는 유격 가이드홈이 형성되어 있으며, 상기 중심 일치 부재와 상기 유격 가이드홈은 상기 몸체부재의 원주 방향을 따라 복수 형성될 수 있다.The inner circumference of the body member is opened from the inside to one side and a clearance guide groove in which the center matching member is located is formed, and a plurality of the center matching member and the clearance guide groove are formed along the circumferential direction of the body member. Can be.
상기 유격 가이드홈은 상기 볼스크류의 길이 방향으로 원통 형태로 형성되어 있고, 상기 유격 가이드홈은 상기 중심 일치 부재의 2/3를 감쌀 수 있다.The clearance guide groove is formed in a cylindrical shape in the longitudinal direction of the ball screw, and the clearance guide groove may surround 2/3 of the center matching member.
상기 중심 일치 부재는 강구를 포함할 수 있다.The center matching member may include a steel ball.
상기 중심 일치 장치는, 상기 볼스크류가 관통하며 상기 베어링의 측면과 접하여 상기 몸체부재의 측면을 가압하는 몸체 가압부재 및 상기 몸체 가압부재에 체결되어 상기 볼스크류의 나사골에 걸리는 체결수단을 포함할 수 있다.The center matching device may include a body pressurizing member through which the ball screw passes and presses the side surface of the body member in contact with the side surface of the bearing, and a fastening means that is fastened to the body pressurizing member to engage the threaded bone of the ball screw. have.
상기 몸체 가압부재에는 상기 체결수단이 체결되는 체결홀이 형성되어 있고, 상기 체결홀은 상기 볼스크류의 길이 방향을 따라 복수 형성되어 있고, 이웃한 상기 체결홀의 중심 간격은 상기 볼스크류의 이웃한 나사골의 중심과 같을 수 있다.The body pressing member has a fastening hole through which the fastening means is fastened, the fastening hole is formed in plural along the length direction of the ball screw, and the center interval of the adjacent fastening hole is adjacent to the screw valley of the ball screw. It can be the same as the center of
상기 유격 가이드홈의 중심은 상기 몸체부재의 중심으로부터 이격되어 있고, 상기 유격 가이드홈의 중심들이 상기 몸체부재의 중심에서 이격된 거리가 같을 수 있다.The center of the clearance guide groove may be spaced apart from the center of the body member, and the centers of the clearance guide groove may be the same distance apart from the center of the body member.
복수 형성된 유격 가이드홈들은 상기 몸체부재의 일측면을 기준으로 그 깊이가 서로 같거나 다르게 형성될 수 있다.The plurality of clearance guide grooves may have the same or different depths based on one side surface of the body member.
본 발명의 한 실시예에 따른 직선운동 장치는, 볼스크류, 상기 볼스크류의 일단을 회전할 수 있게 지지하는 고정단 유닛, 상기 볼스크류의 타단을 회전할 수 있게 지지하는 지지단 유닛, 상기 볼스크류의 일단과 동력 연결된 구동모터, 상기 고정단 유닛과 상기 지지단 유닛을 지지하는 베이스 및 볼 너트를 통해 상기 볼스크류와 동력 연결되어 있고 상기 베이스를 따라 이동하는 테이블을 포함할 수 있다.A linear motion device according to an embodiment of the present invention includes a ball screw, a fixed end unit that supports one end of the ball screw so as to rotate, a support end unit that supports the other end of the ball screw so as to rotate, and the ball A drive motor that is power-connected to one end of the screw, a base that supports the fixed end unit and the support end unit, and a table that is power-connected to the ball screw through a ball nut and moves along the base.
상기 고정단 유닛과 상기 지지단 유닛은 각각 상기와 같이 기재된 중심 일치 장치를 포함할 수 있다.Each of the fixed end unit and the support end unit may include a center matching device described above.
상기 고정단 유닛은, 관통된 내부에 제1 베어링 공간과 제2 베어링 공간이 형성된 고정단 하우징, 상기 제1 베어링 공간에 배치된 제1 베어링 및 상기 제2 베어링 공간에 배치된 제2 베어링을 더 포함할 수 있다.The fixed end unit further includes a fixed end housing having a first bearing space and a second bearing space formed therein, a first bearing disposed in the first bearing space, and a second bearing disposed in the second bearing space. Can include.
상기 볼스크류는, 상기 중심 일치 장치의 몸체부재와 가압부재 그리고 상기 제1 베어링과 상기 제2 베어링의 내부를 관통하고, 상기 고정단 하우징의 내부에는 상기 제1 베어링이 걸리는 걸림턱이 형성될 수 있다.The ball screw passes through the body member and the pressing member of the center matching device, and the inside of the first bearing and the second bearing, and a locking protrusion through which the first bearing is caught may be formed in the fixed end housing. have.
상기 몸체부재는, 상기 제2 베어링의 내부에 위치하고, 상기 몸체부재의 외부 둘레는 상기 제2 베어링의 내륜과 접하고 일측면은 상기 제1 베어링과 접하며, 상기 가압부재는 상기 제2 베어링의 내륜 측면과 상기 몸체부재의 타측면과 접하고, 상기 몸체부재는 상기 가압부재와 상기 제1 베어링의 사이에서 고정될 수 있다.The body member is located inside the second bearing, the outer circumference of the body member is in contact with the inner ring of the second bearing, one side surface is in contact with the first bearing, and the pressing member is a side surface of the inner ring of the second bearing And contacting the other side of the body member, and the body member may be fixed between the pressing member and the first bearing.
상기 지지단 유닛은, 관통된 내부에 제3 베어링 공간이 형성된 지지단 하우징 및 상기 제3 베어링 공간에 배치된 제3 베어링을 더 포함할 수 있다.The support end unit may further include a support end housing having a third bearing space formed therein, and a third bearing disposed in the third bearing space.
상기 중심 일치 장치의 상기 몸체부재는 상기 제3 베어링의 내부에 위치하고, 상기 몸체부재의 외부 둘레는 상기 제3 베어링의 내륜과 접하며, 상기 중심 일치 장치의 가압부재는 상기 제3 베어링의 양측에서 상기 몸체부재의 양측면과 접할 수 있다.The body member of the center matching device is located inside the third bearing, the outer circumference of the body member is in contact with the inner ring of the third bearing, and the pressing members of the center matching device are provided on both sides of the third bearing. It can be in contact with both sides of the body member.
본 발명의 실시예에 따르면, 중심 일치 장치의 중심 일치 부재와 몸체부재에 의해 볼스크류의 나사골 중심과 제2 베어링, 제3 베어링의 회전 중심이 일치하게 되면서 볼스크류는 안정적으로 회전할 수 있다.According to an exemplary embodiment of the present invention, the center of the ball screw and the center of rotation of the second bearing and the third bearing are matched by the center matching member and the body member of the center matching device, so that the ball screw can stably rotate.
도 1은 본 발명의 한 실시예에 따른 직선운동 장치를 나타낸 개략도.1 is a schematic diagram showing a linear motion device according to an embodiment of the present invention.
도 2는 도 1의 고정단 유닛을 나타낸 확대도.Figure 2 is an enlarged view showing the fixed end unit of Figure 1;
도 3은 도 2의 A 부분 확대도.3 is an enlarged view of part A of FIG. 2.
도 4는 도 2의 고정단 유닛 분해 단면도.Figure 4 is an exploded cross-sectional view of the fixed end unit of Figure 2;
도 5는 도 4의 중심 일치 장치와 볼스크류 분해도. Figure 5 is an exploded view of the center matching device and the ball screw of Figure 4;
이하, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 본 발명의 실시예에 대하여 첨부한 도면을 참고로 하여 상세히 설명한다. 그러나 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다. 명세서 전체를 통하여 유사한 부분에 대해서는 동일한 도면 부호를 붙였다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. Like reference numerals are attached to similar parts throughout the specification.
본 발명의 실시예에 따른 중심 일치 장치는 본 발명의 실시예인 직선운동 장치에 적용될 수 있는 바, 이하에서는 중심 일치 장치가 적용된 직선운동 장치 위주로 설명한다.The center matching device according to the embodiment of the present invention can be applied to the linear movement device according to the embodiment of the present invention. Hereinafter, a linear movement device to which the center matching device is applied will be mainly described.
그러면 본 발명의 한 실시예에 따른 직선운동 장치에 대하여 도 1 내지 도 5를 참고하여 설명한다.Then, a linear motion device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
도 1은 본 발명의 한 실시예에 따른 직선운동 장치를 나타낸 개략도이고, 도 2는 도 1의 고정단 유닛을 나타낸 확대도이며, 도 3은 도 2의 A 부분 확대도이고, 도 4는 도 2의 고정단 유닛 분해 단면도이며, 도 5는 도 4의 중심 일치 장치와 볼스크류 분해도이다.1 is a schematic diagram showing a linear motion device according to an embodiment of the present invention, FIG. 2 is an enlarged view showing the fixed end unit of FIG. 1, FIG. 3 is an enlarged view of part A of FIG. 2, and FIG. 4 is 2 is an exploded cross-sectional view of the fixed end unit, and FIG. 5 is an exploded view of the center matching device and the ball screw of FIG. 4.
도 1 내지 도 5를 참고하면, 직선운동 장치(1)는 베이스(10), 볼스크류(20), 구동모터(30), 테이블(40), 고정단 유닛(50) 및 지지단 유닛(60)을 포함하며 고정단 유닛(50)과 지지단 유닛(60)은 각각 중심 일치 장치(54, 63)를 포함한다. 직선운동 장치(1)는 중심 일치 장치(54)를 통해 볼스크류(20)의 나사골의 중심과 베어링의 회전 중심을 일치시켜 볼스크류의 회전품질을 높이고 고속회전이 가능하게 한다.1 to 5, the linear motion device 1 includes a base 10, a ball screw 20, a drive motor 30, a table 40, a fixed end unit 50, and a support end unit 60. ), and the fixed end unit 50 and the support end unit 60 include center matching devices 54 and 63, respectively. The linear motion device 1 matches the center of the screw shaft of the ball screw 20 with the center of rotation of the bearing through the center matching device 54 to increase the rotational quality of the ball screw and enable high-speed rotation.
베이스(10)는 기설정된 길이를 가지며, 일측에는 고정단 유닛(50)이 배치되어 있고 타측에는 지지단 유닛(60)이 배치되어 있다.The base 10 has a predetermined length, a fixed end unit 50 is disposed on one side and a support end unit 60 is disposed on the other side.
볼스크류(20)는 베이스(10)의 길이 방향을 따라 배치되어 일단은 고정단 유닛(50)에 회전할 수 있게 지지되어 있고 타단은 지지단 유닛(60)에 회전할 수 있게 지지되어 있다. 볼스크류(20)의 일단은 고정단 유닛(50)을 관통하여 돌출되어 있다. 볼스크류(20)의 외부 둘레에는 나사가 형성되어 있다. 볼스크류(20)의 나사는 다줄 나사이다. 볼스크류(20)의 나사줄 숫자와 직경, 길이 등은 직선운동 장치(1)의 설계에 따라 다양하게 변경될 수 있다.The ball screw 20 is disposed along the length direction of the base 10 so that one end is rotatably supported by the fixed end unit 50 and the other end is rotatably supported by the supporting end unit 60. One end of the ball screw 20 protrudes through the fixed end unit 50. A screw is formed around the outer periphery of the ball screw 20. The screws of the ball screw 20 are multi-threaded screws. The number, diameter, and length of the screw thread of the ball screw 20 may be variously changed according to the design of the linear motion device 1.
구동모터(30)는 베이스(10)의 일측에 배치되어 공지의 커플러(31)를 통해 고정단 유닛(50)에서 돌출된 볼스크류(20)의 일단과 동력 연결되어 있다. 구동모터(30)의 동력으로 볼스크류(20)는 고정단 유닛(50)과 지지단 유닛(60)에 지지된 상태에서 회전할 수 있다.The driving motor 30 is disposed on one side of the base 10 and is connected to one end of the ball screw 20 protruding from the fixed end unit 50 through a known coupler 31. With the power of the driving motor 30, the ball screw 20 can rotate while being supported by the fixed end unit 50 and the support end unit 60.
테이블(40)은 볼스크류(20)를 사이에 두고 베이스(10)와 마주하며 가이드레일과 가이드블록을 통해 베이스(10)와 연결되어 있다. 아울러 테이블(40)은 볼너트(41)를 통해 볼스크류(20)와 연결되어 있다. 볼너트(41)는 볼스크류(20) 회전 시 볼스크류(20)의 길이 방향을 따라 이동할 수 있으며 이때 테이블(40)은 가이드레일을 따라 베이스(10) 상에서 이동할 수 있다.The table 40 faces the base 10 with the ball screw 20 interposed therebetween, and is connected to the base 10 through a guide rail and a guide block. In addition, the table 40 is connected to the ball screw 20 through a ball nut 41. The ball nut 41 may move along the length direction of the ball screw 20 when the ball screw 20 rotates, and at this time, the table 40 may move on the base 10 along the guide rail.
이와 같은 베이스(10), 볼스크류(20), 구동모터(30) 및 테이블(40)의 세부적인 구성은 본 출원인이 기 출원하여 공지된 직선운동장치(대한민국 특허등록 제10-1648808호)의 구성이 적용될 수 있는 바, 이하 자세한 설명은 생략한다.The detailed configuration of the base 10, the ball screw 20, the drive motor 30, and the table 40 is a linear motion device previously filed by the present applicant (Korean Patent Registration No. 10-1648808). Since the configuration may be applied, a detailed description will be omitted below.
고정단 유닛(50)은 중심 일치 장치(54)와 더불어 고정단 하우징(51), 제1 베어링(52) 및 제2 베어링(53)을 포함한다.The fixed end unit 50 includes a fixed end housing 51, a first bearing 52 and a second bearing 53 together with a center matching device 54.
여기서, 제1 베어링(52)은 스러스트 베어링(thrust bearing)을 포함하며, 제2 베어링(53)은 레이디얼 볼 베어링(radial ball bearing)을 포함한다. 제1 베어링과 제2 베어링을 스러스트 베어링과 레이디얼 볼 베어링으로 한정하지 않은다. 볼스크류(20)는 제1 베어링(52)과 제2 베어링(53)을 관통한다.Here, the first bearing 52 includes a thrust bearing, and the second bearing 53 includes a radial ball bearing. The first bearing and the second bearing are not limited to thrust bearings and radial ball bearings. The ball screw 20 passes through the first bearing 52 and the second bearing 53.
고정단 하우징(51)은 베이스(10)의 상면에 고정되어 상부로 돌출되어 있으며 내부가 관통되어 있다. 고정단 하우징(51)의 내부에는 제1 베어링(52)이 위치하는 제1 베어링 공간(51a)과 제2 베어링(53)이 위치하는 제2 베어링 공간(51b)이 형성되어 있다. 제1 베어링 공간(51a)과 제2 베어링 공간(51b)은 연결되어 있다. 여기서, 제2 베어링 공간(51b)의 둘레 지름은 제1 베어링 공간(51a)의 둘레 지름보다 크다. 제1 베어링 공간(51a)과 제2 베어링 공간(51b)은 고정단 하우징(51)의 중심을 기준으로 좌우 대칭되게 형성되어 있다.The fixed end housing 51 is fixed to the upper surface of the base 10 and protrudes upward and penetrates the inside. Inside the fixed end housing 51, a first bearing space 51a in which the first bearing 52 is located and a second bearing space 51b in which the second bearing 53 is located are formed. The first bearing space 51a and the second bearing space 51b are connected. Here, the circumferential diameter of the second bearing space 51b is larger than the circumferential diameter of the first bearing space 51a. The first bearing space 51a and the second bearing space 51b are formed to be symmetrical left and right with respect to the center of the fixed end housing 51.
제1 베어링 공간(51a)에는 제1 베어링(52)이 걸리는 걸림턱(511)이 형성되어 있으며, 걸림턱(511)과 제1 베어링 공간(51a)의 둘레에는 제1 베어링(52)의 고정륜의 외부면이 밀착되어 걸린다. 그리고 제1 베어링(52)의 고정륜은 볼스크류(20)의 둘레와 떨어져 있으며, 회전륜은 볼스크류(20)의 둘레와 접하고 있다. 제2 베어링(53)이 제2 베어링 공간(51b)에 위치한 상태에서, 제2 베어링(53)의 내륜은 제1 베어링(52)의 회전륜과 접하고 있다.The first bearing space 51a has a locking projection 511 through which the first bearing 52 is caught, and the first bearing 52 is fixed around the locking projection 511 and the first bearing space 51a. The outer surface of the wheel is tightly attached and caught. In addition, the fixing wheel of the first bearing 52 is separated from the circumference of the ball screw 20, and the rotating wheel is in contact with the circumference of the ball screw 20. In a state in which the second bearing 53 is located in the second bearing space 51b, the inner ring of the second bearing 53 is in contact with the rotating wheel of the first bearing 52.
중심 일치 장치(54)는, 몸체부재(541), 그리고 중심 일치 부재(542)를 포함하며 제2 베어링(53)과 볼스크류(20)의 사이에 위치하여 볼스크류(20)의 나사골의 중심과 제2 베어링(53)의 회전 중심을 일치시킨다.The center matching device 54 includes a body member 541 and a center matching member 542, and is located between the second bearing 53 and the ball screw 20, and the center of the screw bone of the ball screw 20 And the rotation center of the second bearing 53 are matched.
몸체부재(541)는 원통 형상으로 형성되어 있으며 볼스크류(20)와 제2 베어링(53)의 내륜 사이에 위치한다. 여기서, 몸체부재(541)의 외부 둘레는 제2 베어링(53)의 내륜의 내부 둘레와 접하고 있다. 그리고 몸체부재(541)의 내부 둘레는 볼스크류(20)의 외부 둘레와 마주한다. 이때 볼스크류(20)의 외부 둘레와 몸체부재(541)의 내부 둘레는 접하고 있다. 이에 몸체부재(541)는 제2 베어링(53)의 내륜과 함께 볼스크류(20)를 따라 회전할 수 있다.The body member 541 is formed in a cylindrical shape and is located between the ball screw 20 and the inner ring of the second bearing 53. Here, the outer circumference of the body member 541 is in contact with the inner circumference of the inner ring of the second bearing 53. And the inner circumference of the body member 541 faces the outer circumference of the ball screw 20. At this time, the outer circumference of the ball screw 20 and the inner circumference of the body member 541 are in contact. Accordingly, the body member 541 may rotate along the ball screw 20 together with the inner ring of the second bearing 53.
한편, 볼스크류(20)의 외부 둘레와 몸체부재(541)의 내부 둘레는 떨어져 있을 수 있다. 이 경우 중심 일치 부재(542)를 통해 몸체부재(541)와 볼스크류(20)는 연결된다.Meanwhile, the outer circumference of the ball screw 20 and the inner circumference of the body member 541 may be separated. In this case, the body member 541 and the ball screw 20 are connected through the center matching member 542.
몸체부재(541)에는 유격 가이드홈(541a)이 형성되어 있다. 유격 가이드홈(541a)은 몸체부재(541)의 일측면에서 내부로 형성되어 있다. 유격 가이드홈(541a)은 몸체부재(541)를 관통하지 않고 볼스크류(20)의 길이 방향을 따라 몸체부재(541)의 일측면에서 기설정된 길이로 형성되어 있으며 둘레는 원형으로 형성되어 있다.A clearance guide groove 541a is formed in the body member 541. The clearance guide groove 541a is formed inside from one side of the body member 541. The clearance guide groove 541a is formed in a predetermined length on one side of the body member 541 along the length direction of the ball screw 20 without penetrating the body member 541 and has a circular circumference.
유격 가이드홈(541a)은 몸체부재(541)의 일측면과 내부 둘레로 개방되어 있다. 유격 가이드홈(541a)이 개방된 몸체부재(541)의 일측면은 제1 베어링(52)의 회전륜과 접하고 있다. 유격 가이드홈(541a)은 몸체부재(541)의 원주 방향을 따라 등간격으로 복수 형성되어 있다. 유격 가이드홈(541a)들의 중심은 몸체부재(541)의 중심에서 떨어져 있으며, 이때 떨어진 거리(L)는 동일하다.The clearance guide groove 541a is open to one side of the body member 541 and the inner circumference thereof. One side surface of the body member 541 in which the clearance guide groove 541a is opened is in contact with the rotating wheel of the first bearing 52. A plurality of clearance guide grooves 541a are formed at equal intervals along the circumferential direction of the body member 541. The centers of the clearance guide grooves 541a are separated from the center of the body member 541, and at this time, the distance L is the same.
도면 도 4 및 도 5에서 유격 가이드홈(541a)들이 몸체부재(541)의 일측면을 기준으로 동일한 깊이(h)를 갖는 것으로 도시하였다. 그러나 유격 가이드홈(541a)의 깊이는 도면 도 6에서 도시한 바와 같이 몸체부재(541)의 일측면을 기준으로 볼스크류(20)의 나선 줄 수에 따라 다르게 형성된다. 예컨대, 1줄 나사의 경우 유격 가이드홈(521a)들의 깊이(h)는 몸체부재(541)의 일측면을 기준으로 갖다. 그러나 2줄 나사의 경우 서로 마주하고 있는 유격 가이드홈이 서로 짝을 이루어 몸체부재(541)의 일측면을 기준으로 같은 깊이(h)를 갖는다. 이에 첫번째 나선 줄과 일치하는 유격 가이드홈의 깊이(h)보다 두번째 나선 줄과 일치하는 유격 가이드홈의 깊이(h)가 몸체부재(541)의 일측면을 기준으로 더 깊게 형성되어 있다. 유격 가이드홈의 깊이(h)는 중심 일치 장치가 적용되는 볼스크류(20)의 나선 줄 수에 따라 다양하게 변경될 수 있다. 4 and 5, the clearance guide grooves 541a are shown to have the same depth h with respect to one side surface of the body member 541. However, the depth of the clearance guide groove 541a is formed differently according to the number of spiral lines of the ball screw 20 based on one side of the body member 541 as shown in FIG. 6. For example, in the case of a single row screw, the depth h of the clearance guide grooves 521a is based on one side of the body member 541. However, in the case of a two-row screw, the gap guide grooves facing each other are paired to have the same depth (h) with respect to one side of the body member 541. Accordingly, the depth (h) of the clearance guide groove coinciding with the second helix line is formed deeper with respect to one side surface of the body member 541 than the depth (h) of the clearance guide groove coincides with the first spiral line. The depth h of the clearance guide groove can be variously changed according to the number of spiral lines of the ball screw 20 to which the center matching device is applied.
중심 일치 부재(542)는 강구를 포함한다. 중심 일치 부재(542)는 유격 가이드홈(541a) 마다 위치하여 유격 가이드홈(541a)의 끝에 위치하고 있다. 그러나 중심 일치 부재(542)는 유격 가이드홈(541a)의 끝에서 떨어져 있을 수 있다.The center matching member 542 includes a steel ball. The center matching member 542 is positioned at each of the clearance guide grooves 541a and is located at the end of the clearance guide groove 541a. However, the center matching member 542 may be separated from the end of the clearance guide groove 541a.
몸체부재(541)의 일측이 제1 베어링(52)의 회전륜과 접하면서 막히게 되어 유격 가이드홈(541a)에 위치한 중심 일치 부재(542)는 유격 가이드홈(541a)에서 이탈하지 않는다.One side of the body member 541 is blocked while being in contact with the rotating wheel of the first bearing 52, so that the center matching member 542 located in the clearance guide groove 541a does not deviate from the clearance guide groove 541a.
아울러 볼스크류(20)가 1줄 나사인 경우 중심 일치 부재(542)들은 몸체부재(541)의 일측면을 기준으로 동일한 곳에 위치한다. 그러나 볼스크류(20)가 2줄 나사이고 유격 가이드홈(541a)의 깊이가 몸체부재(541)의 일측면을 기준으로 깊이(h)가 다른 경우 첫번째 나선 줄에 위치한 중심 일체부재와 두번째 나선 줄에 위치한 중심일체부재는 몸체부재(541)의 일측면을 기준으로 다른 곳에 위치한다.In addition, when the ball screw 20 is a single-row screw, the center matching members 542 are located at the same place with respect to one side of the body member 541. However, if the ball screw 20 is a two-row screw and the depth of the clearance guide groove 541a is different from the one side of the body member 541, the central integral member located in the first spiral row and the second spiral row The integrated central member located at is located in another place with respect to one side of the body member 541.
중심 일치 부재(542)의 둘레 2/3를 유격 가이드홈(541a)의 둘레가 감싸고 있으며 둘레 1/3 부분은 볼스크류(20)의 나사골에 위치한다. 이에, 중심 일치 부재(542)의 적어도 일부분이 몸체부재(541)에서 볼스크류(20)의 방향으로 돌출되어 있다. 중심 일치 부재(542)의 돌출된 부분은 나사골의 둘레와 접하고 있다. 이에 중심 일치 부재(542)는 나사골에 걸린 상태가 될 수 있다.The circumference of the clearance guide groove 541a surrounds 2/3 of the circumference of the center matching member 542, and 1/3 of the circumference is located in the screw valley of the ball screw 20. Accordingly, at least a portion of the center matching member 542 protrudes from the body member 541 in the direction of the ball screw 20. The protruding portion of the center matching member 542 is in contact with the circumference of the screw bone. Accordingly, the center matching member 542 may be caught in the screw bone.
이에, 중심 일치 부재(542)는 볼스크류(20)와 몸체부재(541)의 사이에서 키 역할을 한다. 이에 볼스크류(20)의 회전 시 몸체부재(541)는 볼스크류(20)를 따라 회전할 수 있다.Accordingly, the center matching member 542 serves as a key between the ball screw 20 and the body member 541. Accordingly, when the ball screw 20 rotates, the body member 541 may rotate along the ball screw 20.
중심 일치 부재(542)가 나사골과 접하고, 몸체부재(541)의 외부 둘레가 제2 베어링(53)의 내륜과 접하게 되면서 나사골의 중심과 제2 베어링(53)의 회전 중심은 일치하게 된다. 이에 몸체부재(541)는 중심 일치 부재(542)에 의해 볼스크류(20)를 따라 회전한다.As the center matching member 542 contacts the screw bone and the outer circumference of the body member 541 is in contact with the inner ring of the second bearing 53, the center of the screw bone and the rotation center of the second bearing 53 coincide. Accordingly, the body member 541 rotates along the ball screw 20 by the center matching member 542.
볼스크류(20)의 나사골 중심과 제2 베어링(53)의 회전 중심이 일치하게 되면서 볼스크류(20)는 안정적으로 회전할 수 있다. 이에 볼너트(41)는 볼스크류(20) 상에서 안정적으로 이동할 수 있다.As the center of the screw hole of the ball screw 20 and the center of rotation of the second bearing 53 match, the ball screw 20 can stably rotate. Accordingly, the ball nut 41 can stably move on the ball screw 20.
중심 일치 장치(54)는 몸체 가압부재(543) 및 체결수단(544)을 더 포함할 수 있다. 몸체 가압부재(543)는 몸체부재(541)의 일측면이 제1 베어링(52)의 회전륜에 밀착되도록 몸체부재(541)를 가압한다.The center matching device 54 may further include a body pressing member 543 and a fastening means 544. The body pressing member 543 presses the body member 541 so that one side of the body member 541 is in close contact with the rotating wheel of the first bearing 52.
몸체 가압부재(543)는 볼스크류(20)의 둘레를 감싸고 있으며 제2 베어링(53)의 내륜 및 몸체부재(541)의 타측면과 접하고 있다. 몸체 가압부재(543)는 고정단 하우징(51)의 외부로 노출되어 있다. 몸체 가압부재(543)는 볼스크류(20)를 따라 회전한다.The body pressing member 543 surrounds the circumference of the ball screw 20 and is in contact with the inner ring of the second bearing 53 and the other side of the body member 541. The body pressing member 543 is exposed to the outside of the fixed end housing 51. The body pressing member 543 rotates along the ball screw 20.
몸체 가압부재(543)는 체결홀(543h)이 형성되어 있으며, 체결홀(543h)은 몸체 가압부재(543)의 외부 둘레에서 내부 둘레 방향으로 관통되어 있다. 체결홀(543h)은 몸체 가압부재(543)의 길이 방향을 따라 간격을 두고 복수 형성되어 있다. 이웃한 체결홀(543h)의 중심 간격은 볼스크류(20)의 이웃한 나사골의 중심과 일치한다.The body pressing member 543 has a fastening hole 543h, and the fastening hole 543h penetrates from the outer circumference of the body pressing member 543 in the inner circumferential direction. A plurality of fastening holes 543h are formed at intervals along the length direction of the body pressing member 543. The center spacing of the adjacent fastening holes 543h coincides with the center of the adjacent screw valley of the ball screw 20.
체결수단(544)은 무두볼트를 포함하며, 체결홀(543h)에 체결되어 있다. 체결홀(543h)의 중심이 나사골의 중심과 일치하므로 체결수단(544)의 끝은 나사골에 위치하여 나사골의 둘레와 접하고 있다. 체결수단(544)의 체결로 몸체 가압부재(543)는 볼스크류(20)에서 움직이지 않고 고정된다.The fastening means 544 includes a tanning bolt, and is fastened to the fastening hole 543h. Since the center of the fastening hole 543h coincides with the center of the screw bone, the end of the fastening means 544 is located in the screw bone and is in contact with the circumference of the screw bone. The body pressing member 543 is fixed without moving in the ball screw 20 by fastening the fastening means 544.
한편, 체결수단(544)의 끝이 나사골에 위치한 상태에서 가 체결된 경우 몸체 가압부재(543)는 볼스크류(20)의 중심을 기준으로 회전할 수 있다. 이때 체결수단(544)의 끝이 나사골에 위치하여 나사골을 따라 이동하므로 몸체 가압부재(543)는 회전하면서 제2 베어링(53)의 내륜과 몸체부재(541)의 타측면을 점진적으로 가압할 수 있다. 몸체 가압부재(543)가 제2 베어링(53)과 몸체부재(541)를 가압하고 있는 상태에서 가 체결된 체결수단(544)을 완전히 체결하면 몸체 가압부재(543)는 제2 베어링(53)과 몸체부재(541)를 가압하고 있는 상태에서 볼스크류(20)에 고정된다. 이에 몸체부재(541)는 제1 베어링(52)과 몸체 가압부재(543) 사이에서 움직이지 않고 고정될 수 있다.On the other hand, when the end of the fastening means 544 is located in the screw valley and is fastened, the body pressing member 543 may rotate based on the center of the ball screw 20. At this time, since the end of the fastening means 544 is located in the screw bone and moves along the screw bone, the body pressing member 543 can gradually press the inner ring of the second bearing 53 and the other side of the body member 541 while rotating. have. When the body pressing member 543 is pressing the second bearing 53 and the body member 541 and the fastening means 544 is completely fastened, the body pressing member 543 is the second bearing 53 And the body member 541 is fixed to the ball screw 20 while pressing the body member 541. Accordingly, the body member 541 may be fixed without moving between the first bearing 52 and the body pressing member 543.
지지단 유닛(60)은 중심 일치 장치(63)와 더불어 지지단 하우징(61) 및 제3 베어링(62)을 포함한다. 여기서 제3 베어링(62)은 제2 베어링(53)과 동일한 구성을 갖는다.The support end unit 60 includes a support end housing 61 and a third bearing 62 together with a centering device 63. Here, the third bearing 62 has the same configuration as the second bearing 53.
지지단 하우징(61)은 고정단 하우징(51)과 마주하며 관통된 내부에 제3 베어링(62)이 배치되어 있다.The support end housing 61 faces the fixed end housing 51 and has a third bearing 62 disposed therein.
중심 일치 장치(63)는 고정단 유닛의 중심 일치 장치(63)를 그대로 포함하면서 몸체 가압부재(633a, 633b)와 체결수단(634)이 한 쌍으로 이루어져 있다.The center matching device 63 includes the body pressing members 633a and 633b and the fastening means 634 as a pair while including the center matching device 63 of the fixed end unit as it is.
몸체부재(631)는 볼스크류(20)와 제3 베어링(62)의 내륜 사이에 위치하고, 중심 일치 부재(632)는 몸체부재(631)의 내부에 위치하여 적어도 일부분이 나사골에 위치한다.The body member 631 is located between the ball screw 20 and the inner ring of the third bearing 62, and the center matching member 632 is located inside the body member 631 so that at least a portion of the body member 631 is located in the screw valley.
몸체 가압부재(633a, 633b)는 몸체부재(631)를 기준으로 좌우 양측에 각각 배치되어 제3 베어링(62)의 내륜과 접하고 있다. 몸체 가압부재(633a, 633b)는 체결수단(634)으로 볼스크류(20)의 타단에 고정되어 있다.The body pressing members 633a and 633b are disposed on both left and right sides based on the body member 631 and are in contact with the inner ring of the third bearing 62. The body pressing members 633a and 633b are fixed to the other end of the ball screw 20 with a fastening means 634.
몸체부재(631)와 체결수단(634)에 의해 볼스크류(20)의 타단의 나사골 중심과 제3 베어링(62)의 회전 중심이 일치할 수 있다.By the body member 631 and the fastening means 634, the center of the thread of the other end of the ball screw 20 and the center of rotation of the third bearing 62 may be matched.
지지단 유닛(60)의 중심 일치 장치(63)의 구성요소는 전술된 실시예 고정단 유닛(50)의 중심 일치 장치(54)와 동일하므로 중복된 설명은 생략하기로 한다.Components of the center matching device 63 of the support end unit 60 are the same as those of the center matching device 54 of the fixed end unit 50 of the above-described embodiment, and thus a duplicate description will be omitted.
이상에서 본 발명의 바람직한 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것은 아니고 다음의 청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 형태 또한 본 발명의 권리범위에 속하는 것이다. Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of

Claims (10)

  1. 볼스크류가 관통하는 베어링의 내륜에 설치되어 상기 베어링의 중심과 상기 볼스크류의 나사골 중심을 일치시키는 것으로,It is installed on the inner ring of the bearing through which the ball screw passes to match the center of the bearing and the center of the screw bone of the ball screw,
    내부가 길이 방향을 따라 관통되어 있고 상기 내륜과 결합되는 몸체부재, 그리고A body member having an inside passing through along the length direction and coupled to the inner ring, and
    상기 몸체부재의 내부에 위치하여 적어도 일부분이 상기 나사골에 위치하는 중심 일치 부재A center matching member located inside the body member and at least a portion of which is located in the screw bone
    를 포함하며,Including,
    상기 몸체부재의 내부 둘레에는 내부에서 일측면으로 개방되어 있고 상기 중심 일치 부재가 위치하는 유격 가이드홈이 형성되어 있으며, 상기 중심 일치 부재와 상기 유격 가이드홈은 상기 몸체부재의 원주 방향을 따라 복수 형성된The inner circumference of the body member is opened from the inside to one side and a clearance guide groove is formed in which the center matching member is located, and the center matching member and the clearance guide groove are formed in plural along the circumferential direction of the body member.
    중심 일치 장치.Center matching device.
  2. 제1항에서,In claim 1,
    상기 유격 가이드홈은 상기 볼스크류의 길이 방향으로 원통 형태로 형성되어 있고, 상기 유격 가이드홈은 상기 중심 일치 부재의 2/3를 감싸는 중심 일치 장치.The clearance guide groove is formed in a cylindrical shape in a longitudinal direction of the ball screw, and the clearance guide groove surrounds 2/3 of the center matching member.
  3. 제1항에서,In claim 1,
    상기 중심 일치 부재는 강구를 포함하는 중심 일치 장치.The center matching member includes a steel ball.
  4. 제1항에서,In claim 1,
    상기 볼스크류가 관통하며 상기 베어링의 측면과 접하여 상기 몸체부재의 측면을 가압하는 몸체 가압부재 및A body pressing member through which the ball screw passes and is in contact with the side surface of the bearing to press the side surface of the body member; and
    상기 몸체 가압부재에 체결되어 상기 볼스크류의 나사골에 걸리는 체결수단Fastening means fastened to the body pressing member and caught on the screw bone of the ball screw
    을 포함하는 Containing
    중심 일치 장치.Center matching device.
  5. 제4항에서,In claim 4,
    상기 몸체 가압부재에는 상기 체결수단이 체결되는 체결홀이 형성되어 있고, 상기 체결홀은 상기 볼스크류의 길이 방향을 따라 복수 형성되어 있고, 이웃한 상기 체결홀의 중심 간격은 상기 볼스크류의 이웃한 나사골의 중심과 같은The body pressing member has a fastening hole through which the fastening means is fastened, the fastening hole is formed in plural along the length direction of the ball screw, and the center interval of the adjacent fastening hole is adjacent to the screw valley of the ball screw. Like the center of
    중심 일치 장치.Center matching device.
  6. 제1항에서,In claim 1,
    상기 유격 가이드홈의 중심은 상기 몸체부재의 중심으로부터 이격되어 있고, 상기 유격 가이드홈의 중심들이 상기 몸체부재의 중심에서 이격된 거리가 같은 중심 일치 장치.The center matching device of the clearance guide groove is spaced apart from the center of the body member, the centers of the clearance guide grooves are spaced apart from the center of the body member.
  7. 제1항에서,In claim 1,
    복수 형성된 유격 가이드홈들은 상기 몸체부재의 일측면을 기준으로 그 깊이가 서로 같거나 다르게 형성된 중심 일치 장치.The plurality of clearance guide grooves are formed to have the same or different depths based on one side of the body member.
  8. 볼스크류,Ball Screw,
    상기 볼스크류의 일단을 회전할 수 있게 지지하는 고정단 유닛,A fixed end unit that supports one end of the ball screw so as to be rotatable,
    상기 볼스크류의 타단을 회전할 수 있게 지지하는 지지단 유닛,A support end unit supporting the other end of the ball screw so as to be rotatable,
    상기 볼스크류의 일단과 동력 연결된 구동모터,A drive motor that is powered by one end of the ball screw,
    상기 고정단 유닛과 상기 지지단 유닛을 지지하는 베이스 및A base supporting the fixed end unit and the support end unit, and
    볼 너트를 통해 상기 볼스크류와 동력 연결되어 있고 상기 베이스를 따라 이동하는 테이블A table that is power-connected to the ball screw through a ball nut and moves along the base
    을 포함하며,Including,
    상기 고정단 유닛과 상기 지지단 유닛은 각각 제1항 내지 제5항 중 선택된 어느 한 항에 정의되어 있는 중심 일치 장치를 포함하는Each of the fixed end unit and the support end unit includes a center matching device defined in any one selected from claim 1 to claim 5.
    직선운동 장치.Linear motion device.
  9. 제8항에서,In clause 8,
    상기 고정단 유닛은The fixed end unit
    관통된 내부에 제1 베어링 공간과 제2 베어링 공간이 형성된 고정단 하우징,A fixed end housing in which a first bearing space and a second bearing space are formed in the penetrating interior,
    상기 제1 베어링 공간에 배치된 제1 베어링 및A first bearing disposed in the first bearing space, and
    상기 제2 베어링 공간에 배치된 제2 베어링A second bearing disposed in the second bearing space
    을 더 포함하며,It further includes,
    상기 볼스크류는 상기 중심 일치 장치의 몸체부재와 가압부재 그리고 상기 제1 베어링과 상기 제2 베어링의 내부를 관통하고, 상기 고정단 하우징의 내부에는 상기 제1 베어링이 걸리는 걸림턱이 형성되어 있으며,The ball screw passes through the body member and the pressing member of the center matching device, and the inside of the first bearing and the second bearing, and a locking projection for the first bearing is formed in the fixed end housing,
    상기 몸체부재는 상기 제2 베어링의 내부에 위치하고, 상기 몸체부재의 외부 둘레는 상기 제2 베어링의 내륜과 접하고 일측면은 상기 제1 베어링과 접하며, 상기 가압부재는 상기 제2 베어링의 내륜 측면과 상기 몸체부재의 타측면과 접하고, 상기 몸체부재는 상기 가압부재와 상기 제1 베어링의 사이에서 고정되는The body member is located inside the second bearing, the outer circumference of the body member is in contact with the inner ring of the second bearing and one side of the body member is in contact with the first bearing, and the pressing member is in contact with the inner ring side of the second bearing In contact with the other side of the body member, the body member is fixed between the pressing member and the first bearing
    직선운동 장치.Linear motion device.
  10. 제8항에서,In clause 8,
    상기 지지단 유닛은The support end unit
    관통된 내부에 제3 베어링 공간이 형성된 지지단 하우징 및A support end housing with a third bearing space formed therein, and
    상기 제3 베어링 공간에 배치된 제3 베어링A third bearing disposed in the third bearing space
    을 더 포함하며,It further includes,
    상기 중심 일치 장치의 상기 몸체부재는 상기 제3 베어링의 내부에 위치하고, 상기 몸체부재의 외부 둘레는 상기 제3 베어링의 내륜과 접하며, 상기 중심 일치 장치의 가압부재는 상기 제3 베어링의 양측에서 상기 몸체부재의 양측면과 접하고 있는The body member of the center matching device is located inside the third bearing, the outer circumference of the body member is in contact with the inner ring of the third bearing, and the pressing members of the center matching device are provided on both sides of the third bearing. In contact with both sides of the body member
    직선운동 장치.Linear motion device.
PCT/KR2020/010786 2019-08-23 2020-08-13 Center aligning device, and linearly moving apparatus including same WO2021040291A1 (en)

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