TWM615587U - Ball spline assembly and spline thereof - Google Patents

Abstract

This creation discloses a ball spline group and its spline. The spline includes a cylinder, two end caps, at least one self-lubricating component, and a plurality of balls. The cylinder includes two inner bead grooves recessed on the inner surface and two ball passages respectively adjacent to the two inner bead grooves. Two end caps are respectively installed on the two end faces of the metal cylinder. Each end cover is formed with two turning passages, one end of which is connected to two ball passages, and the other end of which is connected to two inner bead grooves to jointly form two circulation passages. At least one self-lubricating component is installed on an end cover and includes an outer cover provided on the corresponding end cover, and an oil storage unit located between the outer cover and the corresponding end cover. The oil storage unit includes positions corresponding to the two Two lubrication parts of an inner bead groove. A plurality of balls are respectively rollably arranged in the two circulation channels.

Description

Ball spline group and its spline

This creation relates to a linear moving device, in particular to a ball spline group and its spline.

In the existing spline, a metal sleeve and an end cover form a path for the ball to move, and the lubricating oil in the existing spline is scattered in the metal sleeve. Furthermore, the metal sleeve of the existing spline is difficult to be processed, which results in the lubricating oil only being able to flow in the metal sleeve at will, resulting in corresponding defects (such as: leakage or insufficient lubricating oil). Lubrication of the balls).

Therefore, the author believes that the above-mentioned shortcomings can be improved, and with great concentration of research and the application of scientific principles, finally proposed a reasonable design and effective improvement of the above-mentioned shortcomings of this creation.

The inventive embodiment is to provide a ball spline group and its spline, which can effectively improve the defects that may occur in the existing spline.

This creative embodiment discloses a ball spline set, which includes: a spline, including: a cylinder, including two inner bead grooves recessed on the inner surface thereof, and respectively adjacent to the two inner bead grooves Two ball passages; two end caps, respectively installed at both ends of the cylinder; wherein each of the end caps is formed with two turning passages, one end of which is connected to the two ball passages, and the other One end is connected to the two inner bead grooves to jointly form two circulation channels arranged at intervals; and at least one self The lubricating component is installed on one of the end caps, and at least one of the self-lubricating components includes: an outer cap disposed on the corresponding end cap; and an oil storage unit located on the outer cap and the corresponding Between the corresponding end caps, and the oil storage unit includes two lubricating parts respectively corresponding to the two inner bead grooves; Channel; and a shaft, including two outer bead grooves formed on the outer edge; wherein, the shaft passes through the cylinder, and the positions of the two outer bead grooves face the two The inner bead groove and the two outer bead grooves respectively abut against the two lubricating parts of at least one of the self-lubricating components.

The present invention embodiment also discloses a spline of a ball spline group, which includes: a cylinder, including two inner bead grooves recessed on the inner surface, and two inner bead grooves respectively adjacent to the two inner bead grooves. Two ball passages; two end caps are respectively installed at both ends of the cylinder; wherein each of the end caps is formed with two turning passages, one end of which is connected to the two ball passages, and the other end is connected To the two inner bead grooves to form two circulation channels arranged at intervals; at least one self-lubricating component is installed on one of the end caps, and at least one of the self-lubricating components includes: an outer cover provided with On the corresponding end cover; and an oil storage unit located between the outer cover and the corresponding end cover, and the oil storage unit includes positions corresponding to the two inner beads respectively The two lubricating parts of the groove and a plurality of balls are respectively rollably arranged in the two circulation channels.

In summary, the ball spline group and its spline disclosed in the creative embodiment can be provided with at least one of the self-lubricating components, so that the two outer bead grooves of the shaft can be further Ground lubrication, so that the spline and the shaft can move relatively smoothly.

In order to have a better understanding of the features and technical content of this creation, please refer to the following detailed descriptions and drawings about this creation, but these descriptions and drawings are only used to illustrate this creation, not to make any claims about the scope of protection of this creation. limit.

100: Ball spline group

1: Spline

11: Cylinder

111: metal cylinder

1111: inner surface

1112: outer surface

1113: end face

1114: Inner Pearl Ditch

1115: Ball channel

1116: Outer oil circuit

1117: Through the oil circuit

112: Plastic retainer

1121: Inner oil circuit

12: end cap

121: steering channel

122: Extend the oil circuit

123: Lid body

124: cap

125: Dust Rib

13: Ball

14: Self-lubricating components

141: Outer cover

142: oil storage unit

143: oil storage body

1431: Oil Storage Department

1432: Lubrication Department

2: shaft

21: Outer Pearl Ditch

3: clamp rail

31: Ball anti-dropping parts

311: Substrate

312: Flexible arm

3121: Anti-fall ditch

3122: limit film body

3123: free end

32: positioning plate

321: assembly slot

α: central angle

Dmin: shortest distance

L: Centerline

P: Transmission oil circuit

C: Circulation channel

G: gap

S: straight line direction

FIG. 1 is a three-dimensional schematic diagram of the ball spline group in the first creative embodiment.

Fig. 2 is a schematic perspective cross-sectional view of Fig. 1.

Fig. 3 is an exploded schematic view of Fig. 1 (shaft omitted).

Fig. 4 is an exploded schematic view of Fig. 2 (shaft omitted).

Fig. 5 is an exploded schematic view of Fig. 3 (balls omitted).

Fig. 6 is an exploded schematic view of Fig. 4 (balls omitted).

Fig. 7 is a schematic cross-sectional view of Fig. 1 along the section line VII-VII.

Fig. 8 is a schematic cross-sectional view of Fig. 1 along the section line VIII-VIII.

Fig. 9 is a schematic cross-sectional view of Fig. 1 along the section line IX-IX.

FIG. 10 is a three-dimensional schematic diagram of the ball spline group in the second creative embodiment.

Fig. 11 is an exploded schematic diagram of Fig. 10.

FIG. 12 is a schematic cross-sectional view of FIG. 10 along the line XII-XII.

Fig. 13 is a schematic cross-sectional view of Fig. 10 along the section line XIII-XIII.

The following is a specific specific embodiment to illustrate the implementation of the "ball spline set and its spline" disclosed in this creation. Those skilled in the art can understand the advantages and effects of this creation from the content disclosed in this specification. This creation can be implemented or applied through other different specific embodiments, and various details in this specification can also be based on different viewpoints and applications, and various modifications and changes can be made without departing from the concept of this creation. In addition, the drawings of this creation are merely schematic illustrations, and are not depicted in actual size, and are stated in advance. The following implementations will further describe the related technical content of this creation in detail, but the disclosed content is not intended to limit the scope of protection of this creation.

It should be understood that although terms such as "first", "second", and "third" may be used herein to describe various elements or signals, these elements or signals should not Subject to these terms. These terms are mainly used to distinguish one element from another, or one signal from another signal. In addition, the term "or" used in this document may include any one or a combination of more of the associated listed items depending on the actual situation.

[Example 1]

Please refer to FIG. 1 to FIG. 9, which are the first embodiment of the creation. As shown in FIG. 1 and FIG. 2, this embodiment discloses a ball spline group 100, which includes a spline 1 and an insert that penetrates the spline 1 along a straight line direction S. As shown in FIG. It should be noted that, although the spline 1 in this embodiment is described in conjunction with the insert, the creation is not limited to this. For example, in other embodiments not shown in this creation, the spline 1 can be used alone (for example, sold) or used with other components.

In this embodiment, the spline 1 includes a cylinder 11, two end caps 12 respectively installed at both ends of the cylinder 11, and rotatably disposed on the cylinder 11 and the two end caps 12 The multiple balls 13 inside and the two self-lubricating components 14 respectively installed on the two end caps 12, but the invention is not limited to this. For example, in other embodiments not shown in this creation, the spline 1 can selectively adopt two self-lubricating components 14 (for example, only one self-lubricating component 14 is used, or no self-lubricating component 14 is used. Any of the self-lubricating components 14).

As shown in Figures 3 to 6 (please refer to Figures 7 to 9 in due course), the barrel 11 in this embodiment includes a metal barrel 111 and two plastic holders 112 arranged in the metal barrel 111 , And each of the plastic holder 112 and the metal cylinder 111 together form a transmission oil path P connected to any one of the end caps 12. The metal cylinder 111 includes an inner surface 1111, an outer surface 1112 located outside the inner surface 1111, and two end surfaces 1113 connected between the inner surface 1111 and the outer surface 1112.

Furthermore, the metal cylinder 111 is cylindrical and defines a center line L parallel to the linear direction S, and the metal cylinder 111 includes two inner bead grooves recessed in the inner surface 1111 1114, and two ball passages 1115 that penetrate from one of the end surfaces 1113 to the other of the end surfaces 1113 and are respectively adjacent to the two inner ball grooves 1114. In this embodiment, the two inner ball grooves 1114 and the two ball passages 1115 are parallel to the center line L, and any one of the inner ball grooves 1114 is compared with the connected ball passage 1115 A central angle α between 10 degrees and 40 degrees is formed on the center line L (e.g., the center line L in FIG. 7 is compared with the center of the inner bead groove 1114 and the center of the ball channel 1115 Constituted).

Furthermore, the metal cylinder 111 includes an outer oil passage 1116 recessed on the outer surface 1112 and two penetrating oil passages 1117 penetrating from the outer surface 1112 to the inner surface 1111. In this embodiment, the outer oil passage 1116 is annular, and the two through oil passages 1117 are formed by penetrating from the outer oil passage 1116 toward the inner surface 1111; that is, the The outer oil passage 1116 is connected to the two through oil passages 1117. Wherein, one end of any one of the penetrating oil paths 1117 located on the outer oil path 1116 can be used as a lubricating oil injection hole.

Two plastic retainers 112 are spaced apart on the inner surface 1111 of the metal cylinder 111, and either end of the two plastic retainers 112 adjacent to each other is located opposite to one of the inner bead grooves 1114. On both sides. Wherein, the shortest distance Dmin (such as: FIG. 7) between any ends of the two plastic retainers 112 adjacent to each other is smaller than the diameter of any one of the balls 13, so that the balls 13 are effectively Perform a limit. In this embodiment, the distance between either end of the two plastic holders 112 adjacent to each other gradually increases from the direction away from the inner surface 1111 toward the inner surface 1111, but the invention is not limited Here.

Furthermore, an inner oil passage 1121 is recessed on the outer edge of each plastic holder 112, and the two inner oil passages 1121 are respectively connected to the two through oil passages 1117. In this embodiment, any one of the inner oil passages 1121 is approximately located at the center of the outer edge of the plastic holder 112 and parallel to the center line L, and any one of the inner oil passages 1121 is The through oil passages 1117 connected with each other are vertically arranged, but this creation is not limited to this.

Furthermore, the outer edge of each plastic holder 112 is closely attached to the inner surface 1111 of the metal cylinder 111, so that the inner surface 1111 can restrict the inner oil passage 1121; That is to say, when lubricating oil flows from any one of the through oil passages 1117 to the corresponding inner oil passage 1121, the lubricating oil can only flow along the inner oil passage 1121, and it is not easy to overflow to other oil passages. Area, but this creation is not limited to this.

In addition, any one of the inner oil passages 1121 and the through oil passages 1117 connected therewith are collectively defined as one transmission oil passage P (that is, connected to the two through oil passages 1117) in this embodiment. The outer oil passage 1116 is also connected to the two transmission oil passages P), and the two extension oil passages 122 are respectively connected to the two inner oil passages 1121 (such as: FIG. 8) .

It should be additionally noted that although the barrel 11 in this embodiment is illustrated by including the metal barrel 111 and the two matching plastic holders 112, the creation is not limited to this. . For example, in other embodiments not shown in this creation, the barrel 11 may only be the metal barrel 111 and the two plastic retainers 112 may be omitted; that is, the two inner beads A groove 1114 is recessed on the inner surface of the cylinder 11, and two ball passages 1115 are formed in the cylinder 11 penetratingly.

The two end caps 12 are respectively installed on the two end surfaces 1113 of the metal cylinder 111 and fix the two plastic holders 112. Wherein, two ends of each plastic holder 112 are inserted and fixed to the two end caps 12 respectively. In this embodiment, each of the end caps 12 is formed with two steering passages 121 and two extension oil passages 122 respectively connected to the two steering passages 121, but the invention is not limited to this. For example, in other embodiments not shown in the present creation, any one of the end caps 12 may omit two of the extension oil passages 122 thereof.

In each of the end caps 12, one end of the two turning passages 121 is connected to the two ball passages 1115, and the other end is connected to the two inner bead grooves 1114 to form two spaced-apart ball channels. There are two circulation channels C (for example, FIG. 2 and FIG. 9), and a plurality of the balls 13 are respectively rollably arranged in the two circulation channels C. In any one of the circulation channels C of the present embodiment, each of the turning channels 121 is arc-shaped and its radius of gyration is adjusted according to the relative central angle α , so that the balls 13 can be smoothly Move through the steering channel 121.

Furthermore, in each of the end caps 12, the two extension oil passages 122 are also respectively connected to the two transmission oil passages P (the inner oil passages 1121); that is, any one of the The transmission oil passage P is respectively connected to the two inner oil passages 1121 located in different end covers 12 through the two ends of the inner oil passage 1121, and further communicates with one of the circulation passages C.

Accordingly, each circulation channel C can provide its sufficient lubrication effect with a corresponding one of the transmission oil passages P, thereby achieving the goal of effective use of lubricating oil, and preventing lubricating oil leakage from affecting the balls. 13's lubrication.

It should be additionally noted that the two end caps 12 have substantially the same or mirror-symmetrical structure in this embodiment, but the present creation is not limited to this. For example, in other embodiments not shown in this creation, the specific structures of the two end caps 12 may also be slightly different. Furthermore, the specific structure of any of the end caps 12 can be adjusted and changed according to design requirements, so this embodiment is only described in one aspect, but the present creation is not limited to this.

In more detail, any one of the end caps 12 includes a cover body 123 and two covers 124 detachably mounted on the cover body 123. In each of the end caps 12, the cap body 123 is formed with two extension oil passages 122, and each of the caps 124 and the cap body 123 are jointly surrounded and formed with one steering passage 121 . Furthermore, two dust-proof ribs 125 are formed on the inner edge of each cover body 123, which respectively correspond to the extension paths of the two inner bead grooves 1114.

Each of the self-lubricating components 14 includes an outer cover 141 disposed on the corresponding end cover 12, and an oil storage unit 142 located between the outer cover 141 and the corresponding end cover 12 . In this embodiment, the oil storage unit 142 of each self-lubricating component 14 is preferably not deformed due to the pressure of the corresponding end cover 12 and the outer cover 141, thereby maintaining the storage unit 142. The original oil unit 142 Lubrication effect. Furthermore, the oil storage unit 142 of each self-lubricating component 14 is not connected to any one of the transmission oil passages P, nor is it connected to any one of the extension oil passages 122; that is, each The oil storage unit 142 of the self-lubricating component 14 is an independent oil supply mechanism.

In more detail, the oil storage unit 142 of each self-lubricating component 14 includes two oil storage fins 143 arranged at intervals, and each of the oil storage fins 143 includes an oil storage portion 1431 and a self-lubricating unit 1431. A lubricating portion 1432 extends integrally from the oil storage portion 1431. In any one of the oil storage units 142, the lubricating portion 1432 is a piece formed by extending from the arc-shaped inner edge of the oil storage portion 1431, and the piece is approximately semicircular with a radius It is much smaller than the radius of the arc-shaped inner edge.

Furthermore, in each of the self-lubricating components 14, the positions of the two lubricating parts 1432 of the oil storage unit 142 correspond to the two inner bead grooves 1114, and respectively correspond to the end caps. The two dust-proof ribs 125 of 12 are arranged adjacent to each other. Wherein, each lubricating portion 1432 preferably slightly protrudes from the corresponding dust-proof rib 125.

In addition, any one of the oil storage units 142 is described in this embodiment with two oil storage fins 143 arranged at intervals, but the present invention is not limited to this. For example, in other embodiments not shown in this creation, the two oil storage fins 143 may be connected to form a single-piece structure; or, the oil storage unit 142 may also include only one storage油片体143。 油片体143. Furthermore, the two self-lubricating components 14 in this embodiment have substantially the same or mirror-symmetrical structure, but the present creation is not limited to this. For example, in other embodiments not shown in this creation, the specific structures of the two self-lubricating components 14 may also be slightly different.

The insert is inserted through the two plastic holders 112, and the insert is limited to the positions of a plurality of the balls 13. In this embodiment, the insert is illustrated by a shaft 2 which includes two outer bead grooves 21 formed on the outer edge thereof. Furthermore, the shaft 2 passes through the two plastic retainers 112, and the positions of the two outer bead grooves 21 face the two inner bead grooves 1114, and the two outer bead grooves 1114 The bead groove 21 abuts against two of each of the self-lubricating components 14 The lubricating portion 1432 also abuts against the two dust-proof ribs 125 of each end cover 12 respectively.

Accordingly, the spline 1 can be provided with at least one of the self-lubricating components 14, so that the two outer bead grooves 21 of the shaft 2 can be further lubricated, so that the spline 1 It can move relatively smoothly with the shaft 2.

[Example 2]

Please refer to FIG. 10 to FIG. 13, which are the second embodiment of the creation. Since this embodiment is similar to the first embodiment above, the similarities between the two embodiments will not be described again (for example, the spline 1), and the differences between this embodiment and the first embodiment described above are roughly described as follows: In this embodiment, the insert is further defined as a clamp rail 3, which is detachably mounted on the spline 1. The clamping rail 3 includes a ball anti-dropping element 31 and a positioning plate 32 assembled on the ball anti-dropping element 31. The ball anti-dropping member 31 includes a base plate 311 and two elastic arms 312 extending from the base plate 311, and the base plate 311 and the two elastic arms 312 are an integrally formed one-piece structure in this embodiment. But this creation is not limited to this.

Furthermore, the base plate 311 is a generally circular sheet, and its size is slightly larger than the size of the spline 1 perpendicular to the center line L. The area of the base plate 311 connected to the two elastic arms 312 is approximately located on a diameter of the base plate 311, and a gap G is formed between the two elastic arms 312. Wherein, the width of the area adjacent to the gap G of the positioning plate 32 is not less than the width of the area adjacent to the gap G of the substrate 311.

In more detail, each of the two elastic arms 312 is formed with an anti-falling groove 3121 at the positions far away from each other, and each of the elastic arms 312 has a limiting piece 3122 extending from the anti-falling groove 3121, Accordingly, the cross section of each elastic arm 312 parallel to the base plate 311 is Y-shaped. Wherein, the edges of the two limiting sheet bodies 3122 far from the two anti-falling grooves 3121 face each other and have mutually complementary shapes (such as mutually complementary tooth shapes) to jointly form the gap G.

Furthermore, the two elastic arms 312 pass through the spline 1 and face two The inner bead grooves 1114 (for example, the two anti-falling grooves 3121 respectively face the two inner bead grooves 1114), and the edges of the two limiting pieces 3122 are located in any one of the inner bead grooves. The bead groove 1114 is within a projection area formed by orthographic projection of the other inner bead groove 1114.

In addition, the positioning plate 32 is a substantially circular sheet body, and its size is substantially equal to the size of the substrate 311. Furthermore, the positioning plate 32 is detachably mounted on the free ends 3123 of the two elastic arms 312 away from the base plate 311, and the positioning plate 32 and the base plate 311 are respectively located on the spline 1 On the opposite sides. Furthermore, the free end 3123 of each elastic arm 312 is in the shape of a hook, the positioning plate 32 is formed with two assembling grooves 321, and the two assembling grooves 321 are respectively assembled to the two assembling grooves. The free end 3123 of the elastic arm 312.

Accordingly, the spline 1 can be assembled with the clamping rail 3 before conveying, so that during the conveying process, the clamping rail 3 can effectively restrict one of the multiple components of the spline 1 The relative position of each other to avoid loosening each other.

[Technical effects of this creative embodiment]

In summary, the ball spline group and its splines disclosed in the creative embodiment can be provided with two plastic retainers in the metal cylinder, thereby facilitating the formation of the cylinder body communicating with The transmission oil path of any one of the circulation channels. Furthermore, each of the circulation channels can provide its sufficient lubrication effect with a corresponding one of the transmission oil passages, thereby achieving the goal of effective use of lubricating oil, and also avoiding lubricating oil leakage that affects the performance of the balls. lubricating.

Furthermore, the ball spline group and its spline disclosed in the creative embodiment can be provided with at least one of the self-lubricating components, so that the two outer bead grooves of the shaft can be further lubricated , Thereby enabling the spline and the shaft to move relatively smoothly.

In addition, in the ball spline set disclosed in this creative embodiment, the spline can be assembled with the clamping rail before conveying, so that during the conveying process, the clamping rail can effectively restrict the spline. The relative position between the multiple members of the key to avoid loosening each other.

The content disclosed above is only a preferred and feasible embodiment of this creation, and does not limit the patent scope of this creation. Therefore, all equivalent technical changes made using this creation specification and schematic content are included in the patent scope of this creation. Inside.

100: Ball spline group

1: Spline

11: Cylinder

111: metal cylinder

1114: Inner Pearl Ditch

112: Plastic retainer

12: end cap

121: steering channel

13: Ball

14: Self-lubricating components

141: Outer cover

142: oil storage unit

143: oil storage body

1431: Oil Storage Department

1432: Lubrication Department

2: shaft

21: Outer Pearl Ditch

L: Centerline

S: straight line direction

Claims (10)

A ball spline set, comprising: a spline, including: a cylinder, including two inner ball grooves recessed on its inner surface, and two ball channels respectively adjacent to the two inner ball grooves Two end caps, respectively installed at both ends of the cylinder; wherein each of the end caps is formed with two steering channels, one end of which is connected to the two ball channels, and the other end is connected to two The inner bead grooves together form two circulation channels arranged at intervals; and at least one self-lubricating component is installed on one of the end caps, and at least one of the self-lubricating components includes: an outer cover, which is arranged in the phase Corresponding to the end cover; and an oil storage unit located between the outer cover and the corresponding end cover, and the oil storage unit includes positions corresponding to the two inner bead grooves respectively Two lubricating parts; and a plurality of balls, which are respectively rollably disposed in the two circulation channels; and a shaft including two outer bead grooves formed on the outer edge thereof; wherein the shaft passes through In the cylinder, the positions of the two outer bead grooves respectively face the two inner bead grooves, and the two outer bead grooves respectively abut against the two lubricating elements of at least one of the self-lubricating components. Department. The ball spline set according to claim 1, wherein the oil storage unit includes two oil storage fins arranged at intervals, and each of the oil storage fins includes an oil storage portion and a self-contained oil storage unit. One of the lubricating parts integrally extending from the part. The ball spline group according to claim 1, wherein at least one of the self-lubricating groups The number of parts is further limited to two, and the two self-lubricating components are respectively installed on the two end caps. The ball spline set according to claim 1, wherein the barrel includes: a metal barrel including an inner surface, an outer surface, and two connected between the inner surface and the outer surface One end surface; wherein two of the inner ball grooves are recessed on the inner surface of the metal cylinder, and the two ball passages penetrate from one of the end surfaces of the metal cylinder to the other of the end surfaces And two plastic retainers are spaced apart on the inner surface of the metal cylinder, and either end of the two plastic retainers adjacent to each other are located on opposite sides of one of the inner bead grooves Wherein, each of the plastic holders and the metal cylinder jointly form a transmission oil path; wherein, two end caps are fixed to the two plastic holders, and each of the end caps is formed to communicate with two The two extension oil passages of the steering passage, and the two extension oil passages are also respectively connected to the two transmission oil passages. The ball spline set according to claim 4, wherein the metal cylinder includes two penetrating oil passages penetrating from the outer surface to the inner surface, and the outer edge of each plastic retainer is recessed An inner oil passage is formed, and the two inner oil passages are respectively connected to the two through oil passages; wherein, any one of the inner oil passages and the through oil passages connected therewith are collectively defined as one transmission Oil passages, and the two extension oil passages are respectively connected to the two inner oil passages. The ball spline set according to claim 4, wherein the metal cylinder includes an outer oil passage recessed on the outer surface, and the outer oil passage is connected to the two transmission oil passages. The ball spline set according to claim 4, wherein the shortest distance between any ends of the two plastic retainers adjacent to each other is smaller than the diameter of any one of the balls. The ball spline set according to claim 4, wherein the oil storage unit is not connected to any one of the transmission oil passages, nor is it connected to any one of the extension oil passages. A spline of a ball spline group, comprising: a cylinder, including two inner ball grooves recessed on the inner surface of the spline, and two ball channels adjacent to the two inner ball grooves; two The end caps are respectively installed at both ends of the cylinder; wherein each of the end caps is formed with two turning passages, one end of which is connected to the two ball passages, and the other end is connected to the two inner The bead grooves together form two circulation channels arranged at intervals; at least one self-lubricating component is installed on one of the end caps, and at least one of the self-lubricating components includes: an outer cover arranged on the corresponding On the end cover; and an oil storage unit located between the outer cover and the corresponding end cover, and the oil storage unit includes two lubricating parts respectively corresponding to the two inner bead grooves And a plurality of balls, which are respectively rollably arranged in the two circulation channels. The spline of the ball spline set according to claim 9, wherein the number of at least one self-lubricating component is further limited to two, and the two self-lubricating components are respectively mounted on the two end caps; In any one of the self-lubricating components, the oil storage unit includes two oil storage pieces arranged at intervals, and each of the oil storage pieces The body includes an oil storage part and a lubricating part integrally extending from the oil storage part.

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