CN211315018U

CN211315018U - Ball spline group

Info

Publication number: CN211315018U
Application number: CN201921983497.8U
Authority: CN
Inventors: 李进胜; 吴典璋
Original assignee: Tbi Motion Technology Co ltd
Current assignee: Tbi Motion Technology Co ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-08-21
Anticipated expiration: 2029-11-15

Abstract

The utility model discloses a ball spline group, this ball spline group keep a section of thick bamboo, first end cover, second end cover and a plurality of ball including urceolus, ball. The ball retaining cylinder axially penetrates through the outer cylinder, and the first end cover and the second end cover are respectively arranged at two end parts of the outer cylinder. The first end cover comprises a first inner cover, a first outer cover and a plurality of first fixing structures. The first inner cover is provided with a plurality of first fixing columns. A plurality of first fixed columns are correspondingly fixed in a plurality of first fixed holes of the outer barrel. The plurality of first fixing structures fix the first inner cap and the first outer cap to each other when the first outer cap is axially closed on the first inner cap. The second end cover and the first end cover are of the same separable end cover structure. Through the end cover of detachable for ball spline group can assemble through the automatic pearl mode of filling out when the equipment, and it is more convenient quick to make the equipment.

Description

Ball spline group

Technical Field

The utility model relates to a ball spline group, in particular to have the ball spline group of the interior end cover of separation in order to make things convenient for automatic quick filling ball.

Background

The ball spline group is a linear guide rail device with the outer cylinder performing linear motion on the spline shaft, and through the structure that balls in the ball spline group roll relative to the spline shaft in the ball grooves, the ball spline group and the spline shaft can move relatively more smoothly, the load capacity is greatly improved, and the ball spline group can play an effective role in places with overlarge vibration impact load and places needing high-speed motion performance.

The end covers arranged at two ends of the outer cylinder of the existing ball spline group are mostly in a one-piece type, when the ball spline is assembled, the end cover at one end is assembled to the outer cylinder, then the balls are filled into the ball circulation channel, and then a cover plate is utilized to cover the other end so as to prevent the filled balls from falling out. Then, another end cover is assembled to another end, and then the cover plate is pulled away to complete the assembly. However, this assembly method can only use manual work to assemble the ball spline, which is not conducive to automatic assembly and ball filling.

SUMMERY OF THE UTILITY MODEL

In one embodiment, the present invention provides a ball spline set including an outer cylinder, a ball holding cylinder, a first end cap, a second end cap, and a plurality of balls. The outer cylinder comprises an inner ring wall, an outer ring wall, and a first end and a second end which are axially corresponding to each other. The outer cylinder is further provided with a ball groove, a long through hole, a positioning groove, a plurality of first fixing holes and a plurality of second fixing holes. The ball groove and the positioning groove are axially arranged on the inner ring wall. The long through hole axially penetrates between the inner ring wall and the outer ring wall. The first end portions are provided with a plurality of first fixing holes, and the second end portions are provided with a plurality of second fixing holes.

The ball retaining cylinder comprises a positioning lug and a long open slot, the ball retaining cylinder axially penetrates through the outer cylinder, the positioning lug is arranged in the positioning groove in a sliding mode, and the long open slot corresponds to the ball slot. The first end cover is arranged at the first end part of the outer barrel and comprises a first inner cover, a first outer cover and a plurality of first fixing structures. The first inner cover is provided with a plurality of first fixing columns and a first inner bend. The first fixing columns are correspondingly fixed in the first fixing holes of the outer barrel. The first outer cover is provided with a first outer bend, and when the first outer cover is axially covered on the first inner cover, the first outer bend corresponds to the first inner bend and forms the first bend. The plurality of first fixing structures fix the first inner cover and the first outer cover to each other.

The second end cover sets up in the second tip of urceolus, and the second end cover includes second bend, a plurality of second fixed column and a plurality of second fixed knot construct. The second fixing holes are correspondingly fixed on the outer cylinder through the second fixing columns, and the second end covers are fixed to the outer cylinder through the second fixing structures.

The ball groove and the long open groove correspondingly form a ball channel, the first bend, the long through hole and the second bend jointly form a ball circulation channel, and the balls are accommodated in the ball circulation channel.

With the structure, when the ball spline group is assembled, the ball holding cylinder group is arranged in the outer cylinder, and the first end cover or the second end cover can be firstly assembled on one end part of the outer cylinder. For example, if the second end cap is assembled to the second end of the outer cylinder first. Then, through the detachable first end cover, the first inner cover is fixed at the first end of the outer cylinder, at this time, because the first inner bend is provided with the opening corresponding to the long through hole of the outer cylinder, the ball can be filled manually or automatically. After the filling is finished, the first outer cover is covered to the first inner cover, and the first inner cover and the first outer cover are fixed with each other by the first fixing structure, so that the assembly of the ball spline group can be completed. So, through detachable end cover for ball spline group is not limited to and only can use manual to fill out the pearl when the equipment, also can assemble through filling out the pearl mode automatically, makes the equipment more convenient quick, and can fill the ball through the automated mode is quick.

In another embodiment, the present invention provides a ball spline set including an outer cylinder, a first end cap, a second end cap, and a plurality of balls. The outer cylinder comprises an inner ring wall, an outer ring wall, and a first end and a second end which are axially corresponding to each other. The outer cylinder is further provided with a ball groove, a long through hole, a plurality of first fixing holes and a plurality of second fixing holes. The ball groove is axially arranged on the inner ring wall and is provided with a ball retaining structure. The long through hole axially penetrates between the inner ring wall and the outer ring wall. The first end portions are provided with a plurality of first fixing holes, and the second end portions are provided with a plurality of second fixing holes.

The first end cover is arranged at the first end part of the outer cylinder. The first end cover comprises a first inner cover, a first outer cover and a plurality of first fixing structures. The first inner cover is provided with a plurality of first fixing columns and a first inner bend. A plurality of first fixed columns are correspondingly fixed in a plurality of first fixed holes of the outer barrel. The first outer cover has a first outer curved channel. The first outer cover is axially covered on the first inner cover, so that the first outer bend corresponds to the first inner bend and forms the first bend. The plurality of first fixing structures fix the first inner cover and the first outer cover to each other.

The second end cover is arranged at the second end part of the outer barrel. The second end cover comprises a second bend, a plurality of second fixing columns and a plurality of second fixing structures. The second fixing columns are correspondingly fixed in the second fixing holes of the outer barrel. A plurality of second securing structures secure the second end cap to the outer barrel.

The ball groove, the first bend, the long through hole and the second bend form a ball circulation channel together, and the balls are accommodated in the ball circulation channel.

In some embodiments, the second end cap may further comprise a second inner cap and a second outer cap. The second inner cup has a second inner bend and the second fixing columns are arranged on the second inner cup. The second outer cover is provided with a second outer bend, and the second outer cover is axially covered on the second inner cover, so that the second outer bend corresponds to the second inner bend and forms a second bend. The second fixing structures fix the second inner cover and the second outer cover to each other. The second end cover is also made into an inner cover and an outer cover, so that the end cover can be used as a bilateral end cover only by manufacturing one type of end cover during manufacturing, and the number of elements and manufacturing procedures can be reduced.

In some embodiments, the plurality of first securing structures includes a plurality of first removable securing structures. Each first detachable fixing structure can comprise a first screw and a first screw hole penetrating through the first inner cover. The first screw penetrates through the first outer cover and is locked to the first screw hole. Through the detachable fixed knot structure of screw lock mode, if inside ball has when wearing and tearing after long-time the use, then can dismantle the first enclosing cover of first tip or the second enclosing cover of second tip, pour out inside ball back, refill new ball, can resume to use the ball spline group again, and need not purchase brand-new ball spline group.

In some embodiments, each of the first detachable fixing structures includes a first screw passing through the first outer cover and the first inner cover and locked to the first screw hole, and a first screw hole passing through the first end of the outer cylinder. In addition to the first outer cover and the first inner cover fixed to each other by the first screw, the first inner cover and the first outer cover may be fixed to each other by the first screw passing through the first outer cover and the first inner cover and being locked to the outer cylinder, and the first end cap may be locked to the first end of the outer cylinder.

In some embodiments, one of the first fixing posts may be a hollow post, and one of the first fixing holes is disposed corresponding to the long through hole. And the first fixed column which is a hollow column body is arranged corresponding to the first opening of the first inner bend. When the first inner cover is assembled to the first end part of the outer cylinder, the first fixing column of the hollow cylinder is correspondingly fixed in the first fixing hole arranged at the long through hole. Therefore, the first fixing hole and the long through hole are arranged at the same axial center position, and excessive holes do not need to be formed in different positions on the outer barrel, so that the rigidity of the outer barrel is prevented from being reduced due to excessive holes.

In some embodiments, the first inner lid may further include a plurality of first alignment holes, and the first outer lid may further include a plurality of first alignment posts. The first aligning posts correspondingly penetrate through the first aligning holes. The first alignment posts and the first alignment holes may provide further alignment and temporary positioning functions when the first outer lid is assembled to the first inner lid, so as to subsequently fix the first inner lid and the first outer lid to each other by the first fixing structure.

In some embodiments, the first end cap may further include a dust-proof member disposed on a side of the first outer cap relatively far from the first inner cap. The outer cover has the dustproof and reinforcing effects by covering the dustproof piece outside the first outer cover of the first end cover. In some embodiments, the first cover and the dust-proof member can be an integral structure, which can further simplify the components and assembly procedures.

In some embodiments, the ball spline may further comprise a spline shaft axially disposed within the outer barrel. The spline shaft includes a shaft body and a track groove, the track groove is axially disposed on the surface of the shaft body, and the track groove corresponds to a long open groove of the ball holding cylinder or a ball groove of the outer cylinder.

The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by anyone skilled in the art from the disclosure, claims and drawings of the present specification.

Drawings

Fig. 1 is a perspective view of a ball spline set according to a first embodiment of the present invention;

fig. 2 is an exploded view of a first embodiment ball spline set of the present invention;

fig. 3 is an exploded view of the first embodiment of the present invention from another perspective;

fig. 4 is an exploded view of a second embodiment ball spline set of the present invention;

fig. 5 is an exploded view of a third embodiment ball spline set of the present invention;

FIG. 6 is a front view of a outer tub according to a third embodiment of the present invention; and

fig. 7 is an exploded view of a fourth embodiment of the ball spline set of the present invention.

Wherein, the reference numbers:

100. 101, 102, 103 ball spline set

10. 10a

outer cylinder

11, 11a inner annular wall

12. 12a outer

circumferential walls

13, 13a at first ends thereof

14. 14a

second end

15, 15a ball groove

151a ball retaining structure 16, 16a long bore

17

positioning grooves

18, 18a first fixing hole

19 second fixing hole 20 ball holding cylinder

21 positioning lug 22 long slot

30 first end cap 31 first inner cap

311 first fixed column 312 first inner bend

3121 first opening 313 first alignment hole

32 first outer cover 321 first outer bend

322 first alignment post 33 first fixing structure

331 first removable fixing structure 3311 first screw

3312. 3312a first screw hole 34 first bend

35

dust guard

40, 90 second end cap

41 second

inner cover

411, 92 second fixing column

412 second inner bend 4121 second opening

413 second alignment hole 42 second outer cover

421 second outer bend 422 second alignment column

43. 93 second fixing structure

431. 931 second detachable fixing structure

4311. 9311

second screw

4312, 4312a second screw hole

44. 91 second 50 ball channel

60 ball circulation channel 70 balls

80 spline shaft 81 shaft body

82 track groove

Detailed Description

Referring to fig. 1 to 3, fig. 1 is a perspective view of a ball spline set according to a first embodiment of the present invention, fig. 2 is an exploded view of the ball spline set according to the first embodiment of the present invention, and fig. 3 is an exploded view of another viewing angle of the ball spline set according to the first embodiment of the present invention. As shown in fig. 1 and 2, the ball spline set 100 includes an outer cylinder 10, a ball holding cylinder 20, a first end cap 30, a second end cap 40, and a plurality of balls 70.

As can be seen from fig. 2 and 3, the outer cylinder 10 includes an inner annular wall 11, an outer annular wall 12, and axially corresponding first and

second end portions

13 and 14. And the outer tube 10 is further provided with four ball grooves 15, four long through holes 16, two positioning grooves 17, four first fixing holes 18 and four second fixing holes 19. In the embodiment, four ball grooves 15, four long through holes 16, two positioning grooves 17, four first fixing holes 18 and four second fixing holes 19 are exemplified for illustration, but the disclosure is not limited thereto. In other embodiments, only one ball groove 15, one long through hole 16 and one positioning groove 17 may be provided, or more than one ball groove 15, one long through hole 16 and one positioning groove 17 may be provided in any integer, or any combination thereof. The first fixing hole 18 and the second fixing hole 19 may be provided with two or more first fixing holes 18 and second fixing holes 19.

As can be seen in fig. 2, four ball grooves 15 and two positioning grooves 17 are axially arranged in the inner annular wall 11. In the present embodiment, four ball grooves 15 are axially disposed on the inner annular wall 11 and extend from the first end 13 to the second end 14 of the outer cylinder 10. It should be noted that the four ball grooves 15 may be disposed on the inner annular wall 11 at equal angular intervals, or disposed at unequal angular intervals, which is not limited in the disclosure.

The two positioning slots 17 are also axially arranged on the inner annular wall 11, but as can be seen from fig. 2, the positioning slots 17 only extend from the first end 13 of the outer cylinder 10 to a specific distance in the direction of the second end 14, and do not extend from the first end 13 directly to the second end 14. Thus, when the ball holding cylinder 20 is inserted into the outer cylinder 10, the positioning protrusions 21 of the ball holding cylinder 20 are slidably disposed in the positioning grooves 17, and can be abutted against the end portions of the positioning grooves 17, so that the ball holding cylinder 20 is assembled at a desired position, and the ball holding cylinder 20 is prevented from rotating relative to the outer cylinder 10. In addition, in the present embodiment, two positioning grooves 17 are provided at the second end portion 14 of the outer cylinder 10 and extend in the direction of the first end portion 13, but in another embodiment, two positioning grooves 17 may be provided at the first end portion 13 of the outer cylinder 10 and extend in the direction of the second end portion 14.

As can be seen from fig. 3, four long through holes 16 (1 is illustrated in the figure) are axially formed between the inner annular wall 11 and the outer annular wall 12, and are formed from the first end portion 13 to the second end portion 14. The four long perforations 16 may be provided at equal angular intervals or at unequal angular intervals at positions on the outer cylinder. In the present embodiment, the number of the long through holes 16 corresponds to the number of the ball grooves 15, and each long through hole 16 is correspondingly disposed adjacent to one ball groove 15. As can be seen from fig. 2 and 3, four first fixing holes 18 are provided in the first end portion 13, and four second fixing holes 19 are provided in the second end portion 14.

In the present embodiment, the ball holding cylinder 20 includes two positioning projections 21 and four long slots 22. Similarly, two positioning protrusions 21 and four elongated slots 22 are illustrated in the present embodiment, but the disclosure is not limited thereto. In other embodiments, only one positioning protrusion 21 and one long slot 22 may be provided, or more than one positioning protrusion 21 and one long slot 22 may be provided in any integer, or any combination thereof. The ball retaining cylinder 20 is axially inserted into the outer cylinder 10 such that the two positioning protrusions 21 are slidably disposed in the two positioning grooves 17, and the four elongated slots 22 correspond to the four ball slots 15. As can be seen in fig. 3, two positioning projections 21 are provided on opposite sides of the outer side wall of the ball retainer cylinder 20 (only a single side of the positioning projections 21 is illustrated in fig. 3).

When the ball holding cylinder 20 is inserted into the outer cylinder 10, the ball holding cylinder 20 can be set into the outer cylinder 10 at a desired angular position by the mutual positioning of the two positioning projections 21 and the two positioning grooves 17. At this time, the four long slots 22 on the ball holding cylinder 20 correspond one-to-one to the four ball grooves 15 on the inner annular wall 11 of the outer cylinder 10. Thus, a ball groove 15 and a long groove 22 form a ball passage 50 correspondingly.

Referring to fig. 2 and 3 again, the first end cap 30 is disposed on the first end 13 of the outer cylinder 10. The first end cap 30 includes a first inner cap 31, a first outer cap 32, and four first securing structures 33. The first inner lid 31 has four first fixing posts 311 and a first inner curved portion 312. As mentioned above, in the present embodiment, four first fixing structures 33 and four first fixing posts 311 are taken as an example for illustration, but the disclosure is not limited thereto. In other embodiments, two or more first fixing structures 33 and first fixing posts 311 may be provided. The four first fixing posts 311 are correspondingly fixed to the four first fixing holes 18 of the outer barrel 10 in a tight fit manner.

As can be seen from fig. 2 and 3, the first cover 32 has a first outer curve 321. The first outer cap 32 is axially fitted over the first inner cap 31 such that the first outer curved portion 321 corresponds to the first inner curved portion 312 and forms the first curved portion 34 (shown in fig. 1). Subsequently, the four first fixing structures 33 fix the first inner lid 31 and the first outer lid 32 to each other. In the present embodiment, the four first fixing structures 33 are four first detachable fixing structures 331. Each of the first detachable fixing structures 331 includes a first screw 3311 and a first screw hole 3312 passing through the first end 13 of the outer cylinder 10. The first screw 3311 passes through the first outer cap 32 and the first inner cap 31 and is locked to the first screw hole 3312, so that the first inner cap 31 and the first outer cap 32 are fixed to each other and to the outer cylinder 10.

However, in other embodiments, the first screw holes 3312 may be formed on the first inner lid 31, and the first screws 3311 are inserted through the first outer lid 32 and locked to the first screw holes 3312, so that the first inner lid 31 and the first outer lid 32 are fixed to each other.

Similar to the first end cap 30, as can be seen from fig. 2 and 3, the second end cap 40 is provided at the second end 14 of the outer cylinder 10. The second end cap 40 includes a second inner cap 41, a second outer cap 42, and four second fixing structures 43. The second inner lid 41 has four second fixing posts 411 and a second inner curved portion 412. As mentioned above, the second fixing structure 43 and the four second fixing posts 411 are exemplified in the embodiment for illustration, but the disclosure is not limited thereto. In other embodiments, two or more second fixing structures 43 and four second fixing posts 411 may also be provided. The four second fixing posts 411 are correspondingly and tightly fitted and fixed in the four second fixing holes 19 of the outer barrel 10.

The second outer lid 42 has a second outer curve 421, and the second outer lid 42 is axially covered on the second inner lid 41, so that the second outer curve 421 corresponds to the second inner curve 412 and forms a second curve 44 (as shown in fig. 1). Subsequently, the four second fixing structures 43 fix the second inner cover 41 and the second outer cover 42 to each other. In the present embodiment, the four second fixing structures 43 are four second detachable fixing structures 431. Each of the second removable fixing structures 431 includes a second screw 4311 and a second screw 4312 passing through the second end 14 of the outer cylinder 10. The second screw 4311 passes through the second outer cover 42 and the second inner cover 41 and is locked to the second screw hole 4312, so that the second inner cover 41 and the second outer cover 42 are fixed to each other and to the outer cylinder 10.

However, in other embodiments, the second screw hole 4312 may be disposed on the second inner lid 41, and the second screw 4311 passes through the second outer lid 42 and is locked to the second screw hole 4312, so that the second inner lid 41 and the second outer lid 42 are fixed to each other.

If the internal ball 70 is worn after long-term use, the first cover 32 of the first end 13 or the second cover 42 of the second end 14 can be removed, and the internal ball 70 can be poured out and refilled with a new ball 70, so that the ball spline set 100 can be reused without purchasing a new ball spline set 100.

In summary, when the assembly of the components is completed, the ball passage 50, the first curved path 34, the long through hole 16 and the second curved path 44, which are correspondingly assembled, form a ball circulation passage 60. That is, four ball circulation passages 60 will be formed in the present embodiment. A plurality of balls 70 are accommodated in the ball circulation passage 60. In the present embodiment, fig. 2 and 3 illustrate a group of balls 70 assembled in one ball circulation passage 60, and in practice, a plurality of balls 70 may be respectively disposed in correspondence to each ball circulation passage 60, for example, 2 groups, 3 groups or 4 groups may be provided. It is also possible to increase the number of the ball circulation passages 60 while correspondingly increasing the number of the balls, for example, to provide 6 groups, 8 groups or more.

With the above-described structure, when assembling the ball spline set 100, the first end cap 30 or the second end cap 40 can be assembled to the first end portion 13 or the second end portion 14 of the outer cylinder 10 first after the ball holding cylinder 20 is assembled to the outer cylinder 10. For example, the second end cap 40 is first assembled to the second end 14 of the outer tube 10. Next, for the detachable first end cap 30, after the first inner cap 31 is fixed to the first end portion 13 of the outer cylinder 10, the ball 70 can be filled manually or automatically due to the first opening 3121 corresponding to the long through hole 16 of the outer cylinder 10 on the first inner curved path 312. After the filling process, the first outer cover 32 is covered on the first inner cover 31, and the first inner cover 31 and the first outer cover 32 are fixed to each other by the first fixing structure 33, so as to complete the assembly of the ball spline set 100. So, through the end cover of detachable for ball spline set 100 is not limited to and only can use the manual pearl of filling out when the equipment, also can assemble through the automatic pearl mode of filling out, makes the equipment more convenient quick, and can fill the ball through the automated mode fast.

In addition, since the corresponding positioning structures are disposed between the outer cylinder 10 and the ball retaining cylinder 20, between the first inner lid 31 and the outer cylinder 10, and between the second inner lid 41 and the outer cylinder 10, when the components are assembled, as long as the components are positioned and assembled by the positioning structures, the parts of the ball circulation passages 60 are disposed corresponding to each other to communicate with the ball circulation passages 60, and there is no need to align one another.

In the present embodiment, the four first fixing posts 311 are hollow posts, and each first fixing post 311 is disposed corresponding to the first opening 3121 of the first inward curve 312. As can be seen from fig. 3, in the present embodiment, there are four first inner bends 312, and one end of each first inner bend 312 forms a first opening 3121 on the first inner lid 31. The first fixing column 311 having a hollow cylindrical shape is disposed corresponding to the first opening 3121, and the inner diameter of the hollow cylindrical shape is the same as the inner diameter of the first opening 3121, and the inner diameters of the two are slightly larger than or equal to the diameter of the ball 70. Thereby, the ball 70 can pass through the first opening 3121 and also pass through the first fixing column 311.

As shown in fig. 3, in the present embodiment, four first fixing holes 18 are disposed corresponding to the long through holes 16. When the first inner cover 31 is fixedly disposed at the first end 13 of the outer cylinder 10, the four first fixing posts 311 are correspondingly and tightly fixed to the first fixing holes 18 disposed at the long through holes 16. Thus, by providing the first fixing hole 18 and the long through hole 16 at the same axial position, it is not necessary to provide too many holes at different positions on the outer tube 10, and the rigidity of the outer tube 10 is prevented from being lowered due to too many holes. Moreover, when the first fixing post 311 is tightly fitted into the first fixing hole 18, the first inner curved portion 312 is directly connected to the long through hole 16.

In this embodiment, the second end cap 40 also has the same corresponding structure. As shown in fig. 2 and 3, the four second fixing posts 411 are hollow posts, and each of the second fixing posts 411 is disposed corresponding to the second opening 4121 of the second inner curved portion 412. As can be seen from fig. 2 and 3, in the present embodiment, there are four second inner curved channels 412, and one end of each second inner curved channel 412 forms a second opening 4121 on the second inner lid 41. The second fixing column 411 in the shape of a hollow cylinder is disposed corresponding to the second opening 4121, and the inner diameter of the hollow cylinder is the same as the inner diameter of the second opening 4121, and the inner diameters of the two are slightly larger than or equal to the diameter of the ball 70. Thereby, the ball 70 can pass through the second opening 4121 and also pass through the second fixing column 411.

In the present embodiment, four second fixing holes 19 are formed corresponding to the long through holes 16. When the second inner cover 41 is fixedly disposed at the second end 14 of the outer tube 10, the four second fixing posts 411 are correspondingly and tightly fixed to the second fixing holes 19 disposed at the long through holes 16. Thus, the second fixing hole 19 and the long through hole 16 are coaxially arranged, so that it is not necessary to form too many holes at different positions on the outer tube 10, thereby preventing the rigidity of the outer tube 10 from being lowered due to too many holes. Moreover, when the second fixing post 411 is tightly fitted and fixed in the second fixing hole 19, the second inner curved portion 412 is directly connected to the long through hole 16.

In this embodiment, the first inner lid 31 further includes a plurality of first alignment holes 313, and the first outer lid 32 further includes a plurality of first alignment posts 322. When the first outer cover 32 is assembled to the first inner cover 31, the first alignment posts 322 are correspondingly disposed through the first alignment holes 313. The first alignment posts 322 and the first alignment holes 313 can provide further alignment and temporary positioning functions when the first outer lid 32 is assembled to the first inner lid 31, so as to subsequently fix the first inner lid 31 and the first outer lid 32 to each other by the first fixing structures 33.

Similarly, the second inner lid 41 further includes a plurality of second alignment holes 413, and the second outer lid 42 further includes a plurality of second alignment posts 422. When the second outer cover 42 is assembled to the second inner cover 41, the second alignment posts 422 are correspondingly disposed through the second alignment holes 413. The second alignment posts 422 and the second alignment holes 413 may provide further alignment and temporary positioning functions when the second outer cover 42 is assembled to the second inner cover 41, so as to subsequently fix the second inner cover 41 and the second outer cover 42 to each other by the second fixing structures 43.

In this embodiment, the first end cap 30 further includes a dust-proof member 35, and the dust-proof member 35 is disposed on a side of the first outer cap 32 relatively far from the first inner cap 31. As can be seen from fig. 2 and 3, after the first outer cover 32 is assembled, the dust-proof member 35 may be disposed, and then the first inner cover 31, the first outer cover 32 and the dust-proof member 35 are fixed to the outer cylinder 10 together by the first fixing structure 33.

The second end cap 40 is the same as the first end cap 30, and the second end cap 40 may further include a dust-proof member 35, where the dust-proof member 35 is disposed on a side of the second outer cover 42 relatively far away from the second inner cover 41. As can be seen from fig. 2 and 3, after the second outer cover 42 is assembled, the dust-proof member 35 may be disposed, and then the second inner cover 41, the second outer cover 42 and the dust-proof member 35 are fixed to the outer cylinder 10 together by the second fixing structure 43.

The dust-proof member 35 is covered on the outer side of the first outer cover 32 of the first end cap 30 and the outer side of the second outer cover 42 of the second end cap 40, so that the outer covers have the effects of dust prevention and reinforcement.

As shown in fig. 1 and 2, the ball spline set 100 of the present embodiment further includes a spline shaft 80 axially inserted into the outer cylinder 10. The spline shaft 80 includes a shaft body 81 and four track grooves 82. Four track grooves 82 are axially provided on the surface of the shaft body 81, and the four track grooves 82 correspond to the four long slots 22 of the ball holding cylinder 20. These numbers are merely exemplary, and the disclosure is not limited thereto.

Next, referring to fig. 4, fig. 4 is an exploded view of a ball spline set according to a second embodiment of the present invention. The same elements of this embodiment as those of the first embodiment are denoted by the same reference numerals, and the description of the same connection relationship will not be repeated. The present embodiment is different from the first embodiment in that the second end cover 90 of the ball spline set 101 of the present embodiment is a one-piece end cover. As shown in fig. 4, a second end cap 90 is provided at the second end 14 of the outer cartridge 10. The second end cap 90 includes a second curved channel 91, four second fixing posts 92, and four second fixing structures 93. The four second fixing posts 92 are correspondingly and tightly fitted and fixed in the four second fixing holes 19 of the outer cylinder 10 (see fig. 3 for the second fixing holes 19), and the four second fixing structures 93 fix the second end cap 90 to the outer cylinder 10. In this way, the ball passage 50, the first curved path 34, the long through hole 16 and the second curved path 91 together form the ball circulation passage 60.

In this embodiment, the four second fixing structures 93 are four second detachable fixing structures 931, as described in the first embodiment. Each of the second removable fixing structures 931 includes a second screw 9311 and a second screw hole 4312 passing through the second end 14 of the outer cylinder 10. The second screw 9311 will pass through the second end cap 90 and lock to the second screw hole 4312, so that the second end cap 90 is fixed to the outer cylinder 10.

In summary, in addition to the first embodiment in which both end caps are replaced with the detachable end cap, one of the end caps may be an inseparable end cap, and the other end cap may be a detachable end cap. Therefore, as shown in the second embodiment, when the second end cap 90 is an inseparable end cap, the second end cap 90 can be assembled with the second end portion 14 of the outer barrel 10. Then, after the first inner lid 31 is fixed to the first end 13 of the outer tube 10 by the detachable first end cap 30, the ball 70 can be filled manually or automatically due to the first opening 3121 corresponding to the long through hole 16 of the outer tube 10 on the first inner curved path 312. After the filling process, the first outer cover 32 is covered on the first inner cover 31, and the first inner cover 31 and the first outer cover 32 are fixed to each other by the first fixing structure 33, so as to complete the assembly of the ball spline set 100. So, through the end cover of detachable for ball spline set 100 is not limited to and only can use the manual pearl of filling out when the equipment, also can assemble through the automatic pearl mode of filling out, makes the equipment more convenient quick, and can fill the ball through the automated mode fast.

Referring to fig. 5 and 6, fig. 5 is an exploded view of a ball spline set according to a third embodiment of the present invention, and fig. 6 is a front view of an outer cylinder according to a third embodiment of the present invention. The same elements of this embodiment as those of the first embodiment are denoted by the same reference numerals, and the description of the same connection relationship will not be repeated. The ball spline set 102 of the present embodiment includes an outer cylinder 10a, a first end cap 30, a second end cap 40, and a plurality of balls 70. The present embodiment differs from the first embodiment in that the ball spline set 102 of the present embodiment does not use the single-element ball holding cylinder 20 shown in the first embodiment.

As shown in fig. 5, the outer cylinder 10a is axially fitted over the spline shaft 80, and the outer cylinder 10a includes an inner annular wall 11a, an outer annular wall 12a, and a first end 13a and a second end 14a that axially correspond to each other. The outer cylinder 10a is further provided with four ball grooves 15a, four long through holes 16a (only one is shown in the drawings as an example), four first fixing holes 18a, and four second fixing holes (not shown, but the positions thereof are the same as those of the second fixing holes of the first embodiment). In the embodiment, four ball grooves 15a, four long through holes 16a, four first fixing holes 18a and four second fixing holes are exemplified for illustration, but the disclosure is not limited thereto. In other embodiments, only one ball groove 15a and one long through hole 16a may be provided, or one or more ball grooves 15a and long through holes 16a may be provided in any integer. The first fixing hole 18a and the second fixing hole may be two or more first fixing holes 18a and second fixing holes.

As can be seen from fig. 5 and 6, the ball groove 15a is axially provided in the inner annular wall 11a and has a ball retaining structure 151 a. Four ball grooves 15a are axially disposed on the inner annular wall 11a and extend from the first end 13a to the second end 14a of the outer cylinder 10 a. It should be noted that the four ball grooves 15a may be disposed on the inner annular wall 11a at equal angular intervals, or may be disposed at unequal angular intervals, which is not limited in the present disclosure. The ball holding structure 151a of the ball groove 15a is a tip end slightly wrapped along the outer circumference of the ball groove 15a so that the opening pitch of the ball groove 15a (the pitch of the ball holding structures 151a on the left and right sides) is smaller than the diameter of the ball 70, so that the ball 70 can roll in the ball groove 15a without falling out of the ball groove 15a in the radial direction of the outer cylinder 10a, supported by the ball holding structure 151 a. Therefore, the balls 70 can be retained and rolled in the ball grooves 15a without providing the ball retaining cylinder 20 described in the first embodiment.

As can be seen from fig. 5, four long through holes 16a (1 in the figure as an example) are axially formed between the inner annular wall 11a and the outer annular wall 12a and extend from the first end 13a to the second end 14 a. The four long perforations 16a may be provided at equal angular intervals or at unequal angular intervals at positions on the outer cylinder. In the present embodiment, the number of the long through holes 16a corresponds to the number of the ball grooves 15a, and each of the long through holes 16a is correspondingly disposed adjacent to one of the ball grooves 15 a. In this way, the ball groove 15a, the first curved path 34, the long through hole 16a, and the second curved path 44 together form the ball circulation passage 60, and the plurality of balls 70 are accommodated in the ball circulation passage 60.

In addition, in the embodiment, the four first fixing structures 33 are four first detachable fixing structures 331. Each of the first detachable fixing structures 331 includes a first screw 3311 and a first screw hole 3312a passing through the first end 13a of the outer cylinder 10. The first screw 3311 passes through the first outer cap 32 and the first inner cap 31 and is locked to the first screw hole 3312a, so that the first inner cap 31 and the first outer cap 32 are fixed to each other and to the outer cylinder 10 a.

As can be seen from fig. 5, the ball spline set 102 of the present embodiment further includes a spline shaft 80 axially inserted into the outer cylinder 10 a. The spline shaft 80 includes a shaft body 81 and four track grooves 82. Four track grooves 82 are axially provided on the surface of the shaft body 81, and the four track grooves 82 correspond to the four ball grooves 15a of the outer cylinder 10 a. These numbers are merely exemplary, and the disclosure is not limited thereto. The rest of the components and structures are the same as those of the first embodiment and are not described herein again.

Referring to fig. 7, fig. 7 is an exploded view of a ball spline set according to a fourth embodiment of the present invention. The same elements in this embodiment as those in the third embodiment are denoted by the same reference numerals, and the description of the same connection relationship will not be repeated. This embodiment is primarily a combination of the third embodiment ball spline set 102 with the second end cap 90 as described in the second embodiment. As shown in fig. 6, in the present embodiment, the ball spline set 103 is the same as the first embodiment except that the outer cylinder 10a is the same as that of the third embodiment, and the second end cap is the same as the second end cap 90 of the second embodiment, and the other elements and structures are the same as those of the first embodiment, and will not be further described herein.

In this embodiment, the second end cap 90 is provided to the second end 14a of the outer cylinder 10 a. The second end cap 90 includes a second curved channel 91, four second fixing posts 92, and four second fixing structures 93. The four second fixing posts 92 are correspondingly and tightly fixed to four second fixing holes (the positions and the arrangement manners of the second fixing holes are the same as those of the second fixing holes 19, see fig. 3 for details) of the outer cylinder 10a, and the four second fixing structures 93 fix the second end cap 90 to the outer cylinder 10 a. Thus, the ball groove 15a, the first curved path 34, the long through hole 16a, and the second curved path 91 together form a ball circulation passage.

In this embodiment, the four second fixing structures 93 are four second detachable fixing structures 931 as described in the second embodiment. Each of the second removable fixing structures 931 includes a second screw 9311 and a second screw hole 4312a (illustrated by a second screw hole 4312a in fig. 7) passing through the second end 14a of the outer cylinder 10 a. The second screw 9311 will pass through the second end cap 90 and lock to the second screw hole 4312a, so that the second end cap 90 is fixed to the outer cylinder 10 a.

In summary, with the structures described in the third and fourth embodiments, the ball spline set does not need to be provided with a ball holding cylinder, so that the overall structure can be simplified, and the number of components required to be manufactured and assembled can be reduced appropriately.

Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited to the above embodiments, and other changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

Claims

1. A ball spline set, comprising:

the outer cylinder is also provided with a ball groove, a long through hole, a positioning groove, a plurality of first fixing holes and a plurality of second fixing holes, the ball groove and the positioning groove are axially arranged on the inner ring wall, the long through hole axially penetrates between the inner ring wall and the outer ring wall, the first fixing holes are arranged at the first end part, and the second fixing holes are arranged at the second end part; the ball retaining cylinder comprises a positioning lug and a long open slot, the ball retaining cylinder axially penetrates through the outer cylinder, the positioning lug is arranged in the positioning slot in a sliding manner, and the long open slot corresponds to the ball slot;

the first end cover is arranged at the first end part of the outer barrel and comprises a first inner cover, a first outer cover and a plurality of first fixing structures, the first inner cover is provided with a plurality of first fixing columns and a first inner bend, the first fixing columns are correspondingly fixed in the first fixing holes of the outer barrel, the first outer cover is provided with a first outer bend, the first outer cover is axially covered on the first inner cover, so that the first outer bend corresponds to the first inner bend and forms a first bend, and the first inner cover and the first outer cover are fixed with each other by the first fixing structures;

the second end cover is arranged at the second end part of the outer barrel and comprises a second bend, a plurality of second fixing columns and a plurality of second fixing structures, the second fixing columns are correspondingly fixed in the second fixing holes of the outer barrel, and the second end cover is fixed to the outer barrel through the second fixing structures; and

2. The ball spline set according to claim 1, wherein the second end cap further comprises a second inner cap and a second outer cap, the second inner cap has a second inner curved portion and the second fixing posts are disposed on the second inner cap, the second outer cap has a second outer curved portion, the second outer cap axially covers the second inner cap such that the second outer curved portion corresponds to the second inner curved portion and forms the second curved portion, and the second fixing structures fix the second inner cap and the second outer cap to each other.

3. The ball spline set of claim 1 or 2, wherein the first fixing structures are a plurality of first detachable fixing structures.

4. The ball spline set of claim 3, wherein each of the first removable fixing structures comprises a first screw passing through the first outer cover and locked to a first screw hole and a first screw hole passing through the first inner cover.

5. The ball spline set according to claim 3, wherein each of the first removable fixing structures comprises a first screw passing through the first outer cover and the first inner cover and locked to the first screw hole and a first screw hole passing through the first end of the outer cylinder.

6. The ball spline set according to claim 1 or 2, wherein one of the first fixing posts is a hollow post, one of the first fixing holes is disposed corresponding to the long through hole, and the first fixing post in the form of a hollow post is disposed corresponding to a first opening of the first inner curved channel and is fixed corresponding to the first fixing hole disposed at the long through hole.

7. The ball spline set according to claim 1 or 2, wherein the first inner cover further comprises a plurality of first alignment holes, and the first outer cover further comprises a plurality of first alignment posts correspondingly passing through the first alignment holes.

8. The ball spline set of claim 1 or 2, wherein the first end cap further comprises a dust guard disposed on a side of the first outer cap relatively distal from the first inner cap.

9. The ball spline set according to claim 1 or 2, further comprising a spline shaft axially inserted into the outer cylinder, the spline shaft comprising a shaft body and a track groove axially disposed on a surface of the shaft body, and the track groove corresponding to the elongated slot of the ball holding cylinder.

10. A ball spline set, comprising:

the outer cylinder comprises an inner annular wall, an outer annular wall, a first end and a second end which correspond to each other in the axial direction, and is further provided with a ball groove, a long through hole, a plurality of first fixing holes and a plurality of second fixing holes, the ball groove is axially arranged on the inner annular wall and is provided with a ball retaining structure, the long through hole axially penetrates through the space between the inner annular wall and the outer annular wall, the first fixing holes are arranged at the first end, and the second fixing holes are arranged at the second end;

the ball groove, the first curve, the long through hole and the second curve form a ball circulation channel together, and the balls are accommodated in the ball circulation channel.

11. The ball spline set according to claim 10, wherein the second end cap further comprises a second inner cap and a second outer cap, the second inner cap having a second inner curved portion and the second fixing posts being disposed on the second inner cap, the second outer cap having a second outer curved portion, the second outer cap axially covering the second inner cap such that the second outer curved portion corresponds to the second inner curved portion and forms the second curved portion, the second fixing structures fixing the second inner cap and the second outer cap to each other.

12. The ball spline set of claim 10 or 11, wherein the first fixing structures are a plurality of first detachable fixing structures.

13. The ball spline set according to claim 12, wherein each of the first detachable fixing structures includes a first screw passing through the first outer cover and locked to the first screw hole and a first screw hole passing through the first inner cover.

14. The ball spline set according to claim 12, wherein each of the first removable fixing structures comprises a first screw passing through the first outer cover and the first inner cover and locked to a first screw hole and a first screw hole passing through the first end of the outer cylinder.

15. The ball spline set according to claim 10 or 11, wherein one of the first fixing posts is a hollow post, one of the first fixing holes is disposed corresponding to the long through hole, and the first fixing post in the form of a hollow post is disposed corresponding to a first opening of the first inner curved channel and is fixed corresponding to the first fixing hole disposed at the long through hole.

16. The ball spline set according to claim 10 or 11, wherein the first inner cover further comprises a plurality of first alignment holes, and the first outer cover further comprises a plurality of first alignment posts correspondingly passing through the first alignment holes.

17. The ball spline assembly of claim 16, wherein the first end cap further comprises a dust guard disposed on a side of the first outer cap opposite the first inner cap.

18. The ball spline set according to claim 10 or 11, further comprising a spline shaft axially inserted into the outer barrel, the spline shaft comprising a shaft body and a track groove axially disposed on a surface of the shaft body, the track groove corresponding to the ball groove.