WO2017090913A1

WO2017090913A1 - Device for fixing rotating parts of both ends of lead ball screw, and linearly moving apparatus including same

Info

Publication number: WO2017090913A1
Application number: PCT/KR2016/012675
Authority: WO
Inventors: 이종기
Original assignee: 이종기
Priority date: 2015-11-23
Filing date: 2016-11-04
Publication date: 2017-06-01
Also published as: KR101648808B1

Abstract

A device for fixing rotating parts of both ends of a lead ball screw, of the present invention, fixedly supports both ends of the lead ball screw, and comprises: a first assembly for rotatably fixing one end of the lead ball screw; and a second assembly for rotatably fixing the other end of the lead ball screw, wherein the first assembly includes a first pressing member pressing one end of the lead ball screw toward the second assembly while gradually being coupled, the second assembly includes a second pressing member pressing the other end of the lead ball screw toward the first assembly while gradually being coupled, and the first pressing member and the second pressing member press the rotating lead ball screw in the directions facing each other so as to prevent the axial backward movement of the lead ball screw, even if impact is applied to the rotating lead ball screw in the axial direction.

Description

Fixing device for both ends of lead ball screw and linear motion device including the same

The present invention relates to a device for fixing both ends of the lead ball screw and a linear motion device including the same.

Lead ball screw is a key component to position control and direction change in various automation equipments and is widely used throughout the industry. The lead ball screw includes a long rod-shaped screw with a thread formed around its outer circumference and a ball nut coupled to the screw.

Referring to FIG. 14, in the related art, both ends of the screw 40a are individually processed (screw 42a, bearing mounting portion 42b, motor shaft connecting portion 42c, etc.) to connect a bearing, a motor, and the like. At this time, due to the difficulty of individual processing and the difference in processing quality, the rotational quality of the screw 40a was often uneven because the center of the machining site and the center of the screw did not coincide exactly.

In particular, one end of the screw is a fixed end (50a) and the other end is composed of a support end (60a), so that the high-speed rotation of the screw 40a is limited, it is necessary to improve this in both ends fixed method. In addition, the motor shaft coupling must also be improved to more precisely match the center of rotation of each component.

Therefore, in order to more completely combine the screw, the bearing, the motor shaft and the like and to match the centers, there is a need to improve the site where the screw, the bearing, and the motor shaft are installed.

The present invention provides a technique for fixing both ends of the screw of the linear motion device to match the center of rotation of the motor shaft and the screw to increase the rotation quality and higher speed rotation.

The rotating device for fixing both ends of the lead ball screw according to an embodiment of the present invention is to fix and support both ends of the lead ball screw, the first assembly for fixing one end of the lead ball screw to rotate and the other end of the lead ball screw And a second assembly for securely fixing the first assembly, wherein the first assembly includes a first pressing member for urging one end of the lead ball screw toward the second assembly as the first assembly is coupled. And a second pressing member for pressing the other end of the ball screw in the direction of the first assembly, and rotating the lid by pressing the lead ball screw in which the first pressing member and the second pressing member rotate in a direction facing each other. Even if an impact is applied to the ball screw in the axial direction, the lead ball screw does not generate axial push.

The first assembly includes a first housing, a first bearing disposed inside the first housing, and a first bearing shaft through which at least a portion of the lead ball screw is inserted and through which the at least one lead is inserted. The first pressing member may be coupled to the first bearing shaft to press the lead ball screw in the direction of the second assembly.

The first bearing shaft includes a shaft flange through which the lead ball screw penetrates and has an incision formed from one edge to the opposite edge through the axis center, and the inner circumference surrounds and fixes the lead ball screw by narrowing the incision. A shaft housing connected to the shaft flange and penetrating the first bearing and having an insertion hole into which the lead ball screw is inserted, and disposed on the upper and lower sides of the shaft center to penetrate the cutout and narrow the cutout. It may include a pair of flange tightening member, the first pressing member may be coupled to the shaft housing at the center of the shaft and press the lead ball screw toward the second assembly direction.

The first bearing may include a first thrust ball bearing and a second thrust ball bearing facing each other with the stepped inside of the housing, wherein the first thrust ball bearing is connected to the stepped direction by a motor shaft coupling device. As a result, the second thrust ball bearing may be pressed in the stepped direction by the shaft flange.

The rotating device for fixing both ends of the lead ball screw may further include a motor shaft connecting device for power connecting the first bearing shaft and the motor.

The motor shaft coupling device includes a first coupler that can be coupled to a drive shaft of the motor, a second coupler engaged with the first coupler and coupled with the first bearing shaft, and an engagement of the first coupler and the second coupler. It may include a hub coupled to a location.

The inner circumference of the first coupler is smaller than the diameter of the drive shaft of the motor and may be coupled to the drive shaft while the first coupler is heated, and the inner circumference of the first coupler may be in close contact with the drive shaft by cooling. The motor shaft connecting device may further include a tannery bolt fastened to the first coupler and in contact with the driving shaft.

The second assembly may include a second housing, a second bearing disposed inside the second housing, a second bearing shaft at least partially penetrating the second bearing, and the other end of the lead ball screw inserted therein and the second bearing shaft. And a lock nut coupled to and pressurizing the second bearing into the second housing.

The second bearing shaft has a cutout formed from one edge to the opposite edge past the center of the shaft, the shaft flange for tightening the lead ball screw while the lead ball screw penetrates and the inner circumferential diameter decreases as the cutout is narrowed, A pair of flanges connected to the shaft flange and penetrating the second bearing, the shaft housing into which the lead ball screw is inserted, and the upper and lower sides of the shaft center, respectively, penetrating the incision and narrowing the incision. It may include a tightening member, the second pressing member may be coupled to the shaft housing at the center of the shaft and may press the lead ball screw toward the first assembly direction.

The hub has a predetermined hardness and is made of polyurethane, and the ring member may be positioned between the boss of the first coupler and the second coupler to surround the pair of bite protrusions.

The second coupler has a cutout formed from one edge to the opposite edge through the center of the shaft, and is disposed on the upper and lower sides of the shaft center, respectively, and a pair of coupler tightening members penetrating the cutout and narrowing the cutout. Further, the inner circumference of the second coupler may be narrowed while the cutout is narrowed by tightening the coupler fastening member.

The lead ball screw may include a screw secured to the first assembly and the other end secured to the second assembly, and a ball nut coupled to the screw, the screw being coupled to the ball nut. Only helix grooves are processed, and individual machining parts such as planes, screw holes, and circles for engaging bearings, motor shafts, etc. may not be formed.

Motor shaft of both ends rotating part fixing device of the lead ball screw described above, both ends are fixed by both ends rotating device fixing device of the lead ball screw, both ends rotating device of the lead ball screw according to an embodiment of the present invention It includes a motor connected to the connecting device, a table connected to the ball nut of the lead ball screw, and a rotating device for fixing both ends of the lead ball screw and includes a base for guiding the movement of the table.

According to an embodiment of the present invention, the first pressing member of the first assembly coupled with one end of the lead ball screw presses the one end toward the second assembly, and the second pressing member of the second assembly coupled with the other end of the lead ball screw Presses the other end toward the first assembly. The pressure of the first and second pressing members does not cause the lead ball screw to be pushed in the axial direction. Since both ends of the lead ball screw are pressurized and fixed, rotation quality of the lead ball screw may be increased and high speed rotation may be easily performed.

According to the embodiment of the present invention, since the thrust ball bearing supports the first bearing shaft and the second bearing shaft, shaking of the lead ball screw does not occur in the radial direction.

According to the embodiment of the present invention, as the pair of flange fastening members are fastened, the diameter of the insertion hole is reduced while narrowing the spacing of the incision. At this time, a pair of flange fastening members are disposed on the upper and lower sides with respect to the center of the shaft so that the diameter of the insertion hole is reduced in the concentric state. The circumference of the insertion hole is in close contact with the outer surface of the filling member without being eccentric to one side. Thus, the center of rotation of each component can be further.

1 is a perspective view of according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 taken along line II-II.

3 is an exploded perspective view of the first assembly of FIG. 1.

4 is an enlarged view of the first assembly of FIG. 2.

5 is an enlarged view of the bearing shaft of FIG. 4.

6 is a cross-sectional view taken along line VI-VI of FIG. 4.

7 is an exploded perspective view of the second assembly of FIG. 1.

8 is an enlarged view of the second assembly of FIG. 2.

9 is a perspective view showing the motor shaft connecting device of FIG.

10 is an exploded perspective view of FIG. 9;

FIG. 11 is a cross-sectional view taken along the line XI- of FIG. 9; FIG.

12 is a cross-sectional view taken along the line XII- of FIG. 9.

13 is a cross-sectional view taken along line XIII- of FIG. 9;

14 is a perspective view showing an end processing state of a conventional lead ball screw.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Like parts are designated by like reference numerals throughout the specification.

Both ends of the lead ball screw fixing device and the motor shaft connecting device according to an embodiment of the present invention can be applied to the embodiment of the present invention, hereinafter will be described mainly the application of both ends of the rotating ball fixing device and the motor shaft connecting device of the lead ball screw.

Next, a linear motion device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 is a perspective view showing according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line II-II.

1 and 2, the screw 42 of the lead ball screw 40 according to one embodiment of the present invention prevents radial shaking and axial sliding and prevents the center of the drive shaft 31 and the screw of the motor 30. Aligning the center of the spiral groove of (42) (1) includes a motor 30, a lead ball screw 40, both ends of the lead ball screw fixing device and the motor shaft connecting device 70, the lead ball screw Both ends of the rotation fixing device includes a first assembly 50 and a second assembly (60).

The lead ball screw 40 includes a screw 42 having one end fixed to the first assembly 50 and the other end fixed to the second assembly 60 and a ball nut 41 coupled with the screw 42. do. Only the spiral groove for engaging with the ball nut 42 is machined in the screw 42. Thus, the two ends of the screw 42 are not formed with individual processing parts such as a plane, a screw hole, a circle, and the like for coupling with a bearing, a motor shaft, and the like. Only the screw groove is formed in the screw 42 according to the present embodiment. Since no individual machining is formed at both ends, the machining time of the screw 42 can be shortened, and the center of the screw groove and the motor shaft can be easily matched.

The spiral groove of the screw 42 may be machined by rolling or grinding. Filling

members

43a and 43b are coupled to the spiral grooves at one end and the other end of the rolled screw 42. However, the filling

members

43a and 43b may not be coupled to the ground screw 42. In the present embodiment, the rolled screw 42 will be described below.

The ball nut 41 is connected to the table 20 placed on the base 10. When the screw 42 rotates, the table 20 may linearly move along the base 10 due to the movement of the ball nut 41. Here, the base 10 may be a body such as a processing apparatus. In the table 20, a workpiece, a conveyed object, and the like may be placed.

The motor 30 is disposed on one side of the base 10 and is connected to the screw 42 through the motor shaft connecting device 70 and the first assembly 50. When the rotation force of the motor 30 is transmitted to the screw 42 through the motor shaft coupling device 70 and the first assembly 50, the screw 42 is pressed against the first assembly 50 and the second assembly 60. Can rotate in the state.

The first assembly 50 is disposed on one side of the base 10, and the second assembly 60 is disposed on the other side of the base 10. The first assembly 50 and the second assembly 60 face in parallel with the screws 42 interposed therebetween.

Next, with reference to Figures 3 to 6 will be described with respect to both ends of the rotation of the lead ball screw.

FIG. 3 is an exploded perspective view of the first assembly of FIG. 1, FIG. 4 is an enlarged view of the first assembly of FIG. 2, FIG. 5 is an enlarged view of the bearing shaft of FIG. 4, and FIG. 6 is taken along line VI-VI of FIG. 4. It is a cut section.

First, referring to FIGS. 3 and 4, the first assembly 50 includes a first housing 51, a first bearing 52, a first bearing shaft 53, and a first pressing member 54. The pressure is fixed while supporting one end of the screw 42 to rotate.

The first housing 51 is fixed to the base 10. Inside the first housing 51, a bearing space 513 is formed into a first space and a second space by an arrangement space 512 and a step 511. The arrangement space 512 and the bearing space 513 are connected.

The first bearing 52 includes a first thrust ball bearing 521 disposed in a first space of the bearing space 513 and a second thrust ball bearing 522 disposed in a second space of the bearing space 513. do. The first and second

thrust ball bearings

521 and 522 include balls, rotary wheels, and fixed wheels, respectively. The rotating wheel is in contact with the outer circumference of the bearing shaft 53 and the fixed wheel is in contact with the inner circumference of the step 511 and the bearing space 513.

5 and 6, the first bearing shaft 53 has an insertion hole 53a into which one end of the screw 42 is inserted, and has a shaft flange 531, a shaft housing 533, and a flange fastening member 534. It includes, and is supported on the first bearing 52 in one end of the screw 42 is inserted.

The shaft flange 531 and the shaft housing 533 are integrally formed, and the diameter of the shaft housing 533 is smaller than the diameter of the shaft flange 531. The insertion hole 53a passes through the shaft flange 531 and is formed into the shaft housing 533. The insertion hole 53a does not completely penetrate the shaft housing 533.

The shaft housing 533 penetrates the first thrust ball bearing 521 and the second thrust ball bearing 522 and is supported by the rotating wheel. At least a portion of one side of the shaft housing 533 is formed with a screw 533a.

The shaft flange 531 is connected to the other side of the shaft housing 533. The shaft flange 531 is in contact with the second thrust ball bearing 522. The shaft flange 531 presses the second thrust ball bearing 522 toward the step 511 to prevent play between the rotating wheel, the fixed wheel, and the ball.

A cutout 532 is formed in a portion of the shaft flange 531 and the shaft housing 533. The cutout 532 is formed from one edge to the opposite edge past the axial center CL of the screw 42. The cutout 532 separates at least a portion of the shaft flange 531 and the shaft housing 533 into a first member and a second member.

The bolt-tightening flange member 534 is formed in a pair and is disposed on the upper and lower sides with respect to the shaft center CL. Ends of the pair of flange fastening members 534 are fastened to the second member through the first member and the cutout 532.

As the flange tightening member 534 is fastened to the second member, the gap G of the cutout 532 may be narrowed. When the gap G of the cutout 532 is narrowed, the diameter of the circumference of the insertion hole 53a of the shaft flange 531 becomes small, and the shaft flange 531 is tightened while tightening one end of the screw 42. By tightening, the inner circumference of the shaft flange 531 is in close contact with the surface of the filling member 43a so that the first bearing shaft 53 is engaged with the screw 42. When the filling member 43a is omitted, the inner circumference of the shaft flange 531 is in close contact with the surface of the screw 42.

Since the flange fastening member 534 is disposed on the upper and lower sides with respect to the shaft center CL, the insertion hole 53a may be reduced to a concentric state when the flange fastening member 534 is fastened to the second member. Accordingly, the diameter of the circumference of the insertion hole 53a is not eccentric but uniformly reduced, thereby preventing a problem caused by the incision being formed only on one side based on the axis center as in the related art.

In the above description and drawings, a pair of flange tightening members 534 are described as being fastened to the second member through the first member, respectively, but the flange tightening member 534 located on the upper side of the shaft center CL. May be fastened to the second member by penetrating the first member, and the flange fastening member 534 located below may be fastened to the first member by penetrating the second member. By coupling the pair of flange fastening members 534 in opposite directions to each other, the eccentricity does not occur due to the weight of the pair of flange fastening members 534 when the first bearing shaft 53 rotates.

The first pressurizing member 54, which is a tannery bolt, is fastened to the fastening hole 533b of the shaft housing 533 in a state parallel to the shaft center CL, and the screw 42 moves toward the second assembly 60 as it is fastened. Pressurize.

Next, the second assembly 60 will be described with reference to FIGS. 7 and 8.

7 is an exploded perspective view of the second assembly of FIG. 1, and FIG. 8 is an enlarged view of the second assembly of FIG. 2.

7 and 8, the second assembly 60 includes a second housing 61, a second bearing 62, a second bearing shaft 63, a second pressing member 64, and a lock nut 65. ) And press-fixes while supporting the other end of the screw 42 to rotate.

The components of the second housing 61, the second bearing 62, the second bearing shaft 63, and the second pressing member 64 according to the present embodiment are the first assembly according to the embodiment of FIGS. 3 to 6. Since the first housing, the first bearing, the first bearing shaft, and the first pressing member of 50 are the same as in the embodiment, duplicated descriptions will be omitted.

However, the shaft flange 631 of the second bearing shaft 63 presses the first thrust ball bearing 621 of the second bearing 62 toward the step 611 of the second housing 61 so as to press the first thrust. There is no gap between the rotating wheel, the fixed wheel and the ball of the ball bearing 621.

An interior of the lock nut 65 is penetrated, and a screw 65a is formed at least at a part of the inner circumference thereof. When the shaft housing 633 is inserted into the lock nut 65, the

screws

65a and 633a are fastened to each other. When tightening, the lock nut 65 presses the second thrust ball bearing 622 of the second bearing 62 in the direction of the step 611 and the shaft flange 631 receives the first thrust ball bearing of the second bearing 62. 621 is pressed toward the step 611. Pressurization does not cause play between the rotating wheel, the fixed wheel, and the ball of the second bearing 62.

The lock nut 65 is fixed to the shaft housing 633 by a tanned bolt 651 so that the lock nut 65 does not move due to vibration and rotational force of the shaft housing 633.

As the lock nut 65 and the shaft flange 631 press the first thrust ball bearing 621 and the second thrust ball bearing 622 toward the step 611, the second bearing shaft 63 is the second bearing. It can rotate stably in the state supported by the rotating wheel of (62).

The second press member 64, which is a tannery bolt, is fastened to the fastening hole 633b of the shaft housing 633 in a state parallel to the shaft center CL. The second pressing member 64 presses the screw 42 in the direction of the first assembly 50.

Since the first pressing member 54 and the second pressing member 64 press the screws 42 in a direction facing each other, even if an impact is applied to the screws 42 in the axial direction during the rotation of the screws 42, the screws 42 Does not cause axial slippage.

And the thrust ball bearing supports the 1st bearing shaft 53 and the 2nd bearing shaft 63, and the shaking of the screw 42 with respect to a radial direction does not generate | occur | produce.

In addition, since the flange fastening member 634 is disposed on the upper and lower sides with respect to the shaft center CL, the insertion hole 63a may be reduced to a concentric state when the flange fastening member 634 is fastened to the second member. The circumference of the insertion hole 63a of the shaft flange 631 can be in contact with the filling member 43b as a whole.

The center of the spiral groove of the screw 42 and the rotation center of the first bearing shaft 53 and the second bearing shaft 63 may be coincident with the filling member 43b.

Next, the motor shaft connecting device 70 will be described with reference to FIGS. 9 to 13.

FIG. 9 is a perspective view illustrating the motor shaft connecting apparatus of FIG. 2, FIG. 10 is an exploded perspective view of FIG. 9, FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 9, and FIG. 12 is a XII-XII of FIG. 9. 13 is a cross-sectional view taken along the line, and FIG. 13 is a cross-sectional view taken along the line XIII-XIII of FIG. 9.

9 to 13, the motor shaft connecting device 70 according to the present embodiment includes a first coupler 71, a second coupler 72, a coupler fastening member 74, and a hub 73. In the arrangement space 512 (see FIG. 4), the motor 30 and the screw 42 are powered by the first bearing shaft 53.

First, referring to FIGS. 9 and 10, the first coupler 71 protrudes from one surface of the boss 711 having the through hole 71 a and the boss 711 and extends the through hole 71 a. It includes 712 and is coupled to the drive shaft 31 of the motor 30 through the through hole (71a). In order to increase the coupling force between the first coupler 71 and the drive shaft 31, the first coupler 71 is fixed to the drive shaft 31 by a tanned bolt 713 (see FIG. 11). The bite protrusion 712 is formed at intervals along the circumferential direction with respect to the center of the through hole 71a. The end of the drive shaft 31 and the end of the bite protrusion 712 coincide.

The diameter of the through hole 71a is smaller than the diameter of the drive shaft 31. For example, the diameter of the through hole 71a and the diameter of the drive shaft 31 are about 0.01 mm. Thus, when the first coupler 71 and the drive shaft 31 are coupled, the first coupler 71 is coupled to the drive shaft 31 while heat is applied to the first coupler 71. The inner circumference of the first coupler 71 may be in close contact with the circumference of the drive shaft 31 by being cooled. The rotation centers of the first coupler 71 and the drive shaft 31 are coincident with each other without shifting. The screw shake caused by the center deviation of the coupler and the drive shaft can be prevented. And it is not necessary to process a key, a key groove, etc. for coupling with the first coupler 71 on the drive shaft (31).

The second coupler 72 includes a boss 721 having a through hole 72a and a stitching protrusion 722 which protrudes from one surface of the boss 721 and is inserted between the stitching protrusions 712 of the first coupler 71. It is coupled to the shaft housing 533. The end of the bite protrusion 722 of the second coupler 72 faces one surface of the boss 711 of the first coupler 71, and the end of the bite protrusion 712 of the first coupler 71 is the second coupler 72. Face the boss (721). The inside of the stitching protrusion 722 of the second coupler 72 faces the drive shaft 31. The end of the drive shaft 31 is in close proximity to the shaft housing 533.

When the drive shaft 31 is inserted up to the position of the chamfer 712, the contact area between the motor shaft coupling device 70 and the drive shaft 31 increases more than the driving shaft 31 is inserted up to the boss 711 position. ) And the driving force of the driving shaft 31 can be improved.

A side surface of the bite protrusion 722 of the second coupler 72 and the bite protrusion 711 of the first coupler 71 are separated to form a space B having a predetermined width therebetween.

One side of the shaft housing 533 is inserted into the boss 721 through the through hole 72a. At least a portion of the periphery of the through hole 72a is formed with a screw 721b engaged with the screw 533a of the shaft housing 533.

As the shaft housing 533 and the boss 721 are fastened, the shaft flange 531 presses the second thrust ball bearing 522 toward the step 511, and the boss 721 is the first thrust ball bearing 521. Is pressed toward the step 511. Pressurization does not cause play between the rotating wheel, the fixed wheel, and the ball of the first bearing 52 (see FIG. 4). Thus, the first bearing shaft 53 may rotate stably in a state supported by the rotation wheel of the first bearing 52.

Referring to FIG. 12, the boss 721 of the second coupler 72 has a cutout 721a, and the cutout 721a is the same as the cutout embodiment according to the embodiment of FIGS. 3 to 6 and thus overlaps. The description will be omitted.

The cutout portion 721a may be narrowed by the fastening of the pair of coupler fastening members 74, and the boss 721 may tighten the shaft housing 533 as the circumferential diameter of the through hole 72a decreases. The portion around the through hole 72a where the screw 721a is not formed and the portion where the screw 533a of the shaft housing 533 is not formed are in contact with each other. As a result, the center of rotation of the second coupler 72 and the center of rotation of the shaft housing 533 may coincide with each other.

Coupler tightening member 74 tightening structure is the same as the embodiment of the flange tightening member according to the embodiment of Figures 3 to 6 duplicated description will be omitted.

The hub 73 includes a ring member 731 and a rib 732 and transmits the rotational force of the first coupler 71 to the second coupler 72. The hub 73 is processed by injection and can be made of polyurethane.

The ring member 731 surrounds the bite protrusion 712 of the first coupler 71 and the bite protrusion 722 of the second coupler 72. The boss and the bite protrusion are stepped by the thickness of the ring member 731 so that the outer circumference of the ring member 731 coincides with the outer circumference of the

boss

711, 721.

The rib 732 protrudes toward the center from the inner circumference of the ring member 731 and is arranged along the circumferential direction. One end of the rib 732 is connected to the inner circumference of the ring member 731, and the other end of the rib 732 does not extend freely to the virtual center 731a of the ring member 731. 731a). Connecting the other end of the ribs 731 can be a predetermined diameter. The diameter may be greater than or equal to the diameter of the drive shaft 31. The center portion of the ring member 731 is empty so that the drive shaft 31 can penetrate the other end of the rib 732. The rib 732 is located between the bite 712 and the bite 722 (see FIG. 13).

The width W1 of the rib 732 seen from the front of the hub 73 is formed to be wider than the space W2 between the

adjacent bites

712 and 722. The rib 732 made of polyurethane or the like has an elastic force while maintaining a predetermined strength. Thus, the ribs 732 are compressed between the neighboring

bites

712 and 722 when the

bites

712 and 722 are inserted between the neighboring ribs 732. By the rib 732 being compressed, the

insertion protrusions

712 and 722 can be easily inserted between the adjacent ribs 732.

Another embodiment of the present invention has most of the components of the embodiment described with reference to FIGS. 1 to 13. However, in the present exemplary embodiment, the second coupler 72 may be directly coupled to the screw 42 instead of the first bearing shaft 53 to tighten the screw 42. In other configurations, the configuration of the embodiment of FIGS. 1 to 13 may be applied as it is.

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 of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

By holding and supporting both ends of the lead ball screw,

A first assembly for rotatably securing one end of the lead ball screw; and

A second assembly for rotatably fixing the other end of the lead ball screw

Including,

The first assembly includes a first pressing member which presses one end of the lead ball screw toward the second assembly as the first assembly is coupled, and the second assembly presses the other end of the lead ball screw toward the first assembly as the second assembly is coupled. A second pressing member,

Since the lead ball screw in which the first pressing member and the second pressing member rotate is pressed in a direction facing each other, the lead ball screw is axially pushed even when an axial impact is applied to the rotating lead ball screw. Do not

Fixture to both ends of lead ball screw.
In claim 1,

The first assembly,

First housing,

A first bearing disposed inside the first housing and

A first bearing shaft through which at least a portion passes through the first bearing and one end of the lead ball screw is inserted

Including;

The first pressing member is coupled to the first bearing shaft to press the lead ball screw in the direction of the second assembly

Fixture to both ends of lead ball screw.
In claim 2,

The first bearing shaft,

A shaft flange through which the lead ball screw penetrates and has an incision formed from one edge to an opposite edge beyond the axis center, and the inner circumference surrounds and fixes the lead ball screw by narrowing the incision;

A shaft housing connected to the shaft flange and penetrating the first bearing and having an insertion hole into which the lead ball screw is inserted;

A pair of flange fastening members disposed respectively on the upper and lower sides of the shaft center to penetrate the cutout and narrow the cutout;

Including;

The first pressing member is coupled to the shaft housing at the center of the shaft to press the lead ball screw in the direction of the second assembly

Fixture to both ends of lead ball screw.
In claim 3,

The first bearing,

A first thrust ball bearing and a second thrust ball bearing facing each other with the stepped therein in the housing;

The first thrust ball bearing is pressed in the stepped direction by a motor shaft connecting device and the second thrust ball bearing is pressed in the stepped direction by the shaft flange.

Fixture to both ends of lead ball screw.
In claim 2,

Fixing device for rotating both ends of the lead ball screw further comprises a motor shaft connecting device for power connecting the first bearing shaft and the motor.
In claim 5,

The motor shaft connecting device,

A first coupler that may be coupled to a drive shaft of the motor,

A second coupler engaged with the first coupler and coupled with the first bearing shaft;

A hub coupled to the engaged position of the first coupler and the second coupler

Containing

Fixture to both ends of lead ball screw.
In claim 6,

The inner circumference of the first coupler is smaller than the diameter of the drive shaft of the motor and may be coupled to the drive shaft while the first coupler is heated, and the inner circumference of the first coupler may be in close contact with the drive shaft by cooling. Can,

The motor shaft connecting device,

Further comprising a tannery bolt fastened to the first coupler in contact with the drive shaft

Fixture to both ends of lead ball screw.
In claim 2,

The second assembly,

Second housing,

A second bearing disposed inside the second housing,

A second bearing shaft having at least a portion penetrating through the second bearing and having the other end of the lead ball screw inserted;

A lock nut coupled to the second bearing shaft and pressurizing the second bearing into the second housing;

Containing

Fixture to both ends of lead ball screw.
In claim 8,

The second bearing shaft,

A shaft flange having an incision formed from one edge to an opposite edge through the center of the shaft, the lead ball screw penetrating and narrowing the incision to reduce the inner circumference diameter and tighten the lead ball screw;

A shaft housing connected to the shaft flange and penetrating the second bearing and into which the lead ball screw is inserted;

A pair of flange fastening members disposed respectively on the upper and lower sides of the shaft center to penetrate the cutout and narrow the cutout;

Including;

The second pressing member is coupled to the shaft housing at the center of the shaft to press the lead ball screw toward the first assembly direction

Fixture to both ends of lead ball screw.
In claim 6,

The hub,

A ring member and a plurality of ribs protruding from an inner surface of the ring member,

Each of the plurality of ribs protrudes from the inner circumference of the ring member toward the center, and one end of the rib is connected to the inner circumference of the ring member and the other end does not extend freely to the center of the ring member. Is formed to be away from the center of the member to keep the central portion of the ring member empty

Fixture to both ends of lead ball screw.
In claim 10,

The first coupler and the second coupler are each,

Boss with through-hole formed in the center

A pair of bite protrusions protruding vertically from one surface of the boss

Including,

The pair of stitches of the first coupler and the second coupler are spaced apart from each other, the ribs are located between the stitches, and the drive shaft is capable of penetrating the stitches and the lead.

Fixture to both ends of lead ball screw.
In claim 11,

The hub has a predetermined hardness and is made of polyurethane, the ring member is positioned between the boss of the first coupler and the second coupler, both ends of the lead ball screw fixing device for wrapping the pair of bite projections.
In claim 12,

The second coupler has a cutout formed from one edge to the opposite edge through the center of the shaft, and is disposed on the upper and lower sides of the shaft center, respectively, and a pair of coupler tightening members penetrating the cutout and narrowing the cutout. Further, the inner circumference of the second coupler can be narrowed while the incision is narrowed by tightening the coupler fastening member

Fixture to both ends of lead ball screw.
In claim 1,

The lead ball screw,

A screw having one end fixed to the first assembly and the other end fixed to the second assembly, and

Ball nut coupled with the screw

Including,

The screw is machined only with a spiral groove for coupling with the ball nut, and does not have a separate machining part such as a plane, a screw hole, a circle, etc. for coupling with a bearing, a motor shaft, or the like.

Fixture to both ends of lead ball screw.
A device for fixing both ends of the lead ball screw as defined in any one of claims 1 to 14,

A lead ball screw having both ends fixed by both ends of the lead ball screw fixing device,

A motor connected to a motor shaft connecting device of both ends of the lead ball screw fixing device;

A table connected with the ball nut of the lead ball screw and

A base for fixing both ends of the lead ball screw is installed and guides the movement of the table.

Containing.