TWM615588U - 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 respectively installed at both ends of the cylinder, and a plurality of balls arranged in the cylinder and the two end caps. The barrel includes a metal barrel and two plastic holders spaced apart on the inner surface of the metal barrel. The metal cylinder includes two inner bead grooves recessed on the inner surface and two ball passages respectively adjacent to the two inner bead grooves. Either ends of the two plastic retainers adjacent to each other are respectively located on opposite sides of an inner bead groove, and each plastic retainer and the metal cylinder jointly form a transmission oil path. Each end cover is formed with two steering passages and two extension oil passages respectively communicating with the two steering passages. Each turning channel is connected to a ball channel and its adjacent inner ball groove. The two extension oil passages are respectively connected to the two transmission oil passages.

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, resulting in the lubricating oil can only flow freely in the metal sleeve, which in turn leads to corresponding defects (such as: leakage or lack of lubricating oil affects 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: a metal cylinder, including an inner surface, an outer surface, and connected to the inner surface and the The two end surfaces between the outer surfaces; wherein the metal cylinder includes two inner bead grooves recessed on the inner surface, and penetrates from one of the end surfaces to the other of the end surfaces and are respectively adjacent to The two ball passages of the two inner ball grooves; and two plastic retainers, which are arranged at intervals on the inner surface of the metal cylinder, and the two plastic retainers are located at either end adjacent to each other. Opposite sides of one of the inner bead grooves; wherein each of the plastic retainers and the metal cylinder jointly form a transmission oil path; two end caps are respectively installed on the two end faces of the metal cylinder , And fix two of the plastic retainers; wherein each of the end caps is formed with: two turning channels, one end of which is connected to the two ball channels, and the other end is connected to the two inner ball grooves , Two circulation passages arranged at a common interval; and two extension oil passages respectively connected to the two steering passages, and the two extension oil passages are also respectively connected to the two transmission oil passages; and A plurality of balls are respectively rotatably arranged in the two circulation channels; and an insert is inserted through the two plastic retainers, and the insert is limited to the positions of the plurality of balls.

The inventive embodiment also discloses a spline of a ball spline group, which includes: a cylinder, including: a metal cylinder, including an inner surface, an outer surface, and connected to the inner surface and the outer surface Wherein, the metal cylinder includes two inner bead grooves recessed on the inner surface, and from one of the end surfaces to the other of the end surfaces and are respectively adjacent to the two inner bead grooves The two ball passages of the inner bead groove; and two plastic retainers, which are arranged at intervals on the inner surface of the metal cylinder, and either end of the two plastic retainers adjacent to each other is located in one place, respectively The opposite sides of the inner bead groove; wherein, each of the plastic retainers and the metal cylinder together form a transmission oil path; two end caps are respectively installed on the two end faces of the metal cylinder, and Two plastic retainers are fixed; 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 Together constitute two circulation passages arranged at intervals; and two extension oil passages respectively connected to the two steering passages, and the two extension oil passages are also respectively connected to the two transmission oil passages; and a plurality of Rolling balls are respectively rotatably arranged in the two circulation channels.

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.

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.

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 be limited by 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 1114 recessed on the inner surface 1111 , 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 between either ends of the two plastic retainers 112 adjacent to each other (such as: FIG. 7) 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 communicating with them 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 steering passages 121 is connected to the two ball passages 1115, and the other end is connected to the two inner bead grooves 1114, so as to jointly 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 lubrication effect of the oil unit 142. 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 respectively abuts against the two lubricating parts 1432 of each of the self-lubricating components 14 and also respectively abuts against the two dust-proof ribs 125 of each of the end caps 12.

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 pieces 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 penetrate the spline 1 and face the two 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 sheets 3122 are located within a projection area formed by orthographic projection of any one of the inner bead grooves 1114 toward 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 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.

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

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

Figure 5 is an exploded schematic view of Figure 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.

100: Ball spline group

1: Spline

11: Cylinder

111: metal cylinder

1117: Through the oil circuit

112: Plastic retainer

1121: Inner oil circuit

12: end cap

122: Extend the oil circuit

14: Self-lubricating components

2: shaft

L: Centerline

P: Transmission oil circuit

S: straight line direction

Claims (10)

A ball spline group, which includes: A spline, including: A cylinder containing: A metal cylinder includes an inner surface, an outer surface, and two end surfaces connected between the inner surface and the outer surface; wherein, the metal cylinder includes two recessed surfaces on the inner surface. An inner bead groove, and two ball passages that penetrate from one of the end surfaces to the other of the end surfaces and are respectively adjacent to the two inner bead grooves; and Two plastic retainers are arranged on the inner surface of the metal cylinder at intervals, 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 Each of the plastic holders and the metal cylinder together form a transmission oil path; Two end caps are respectively installed on the two end faces of the metal cylinder and fix the two plastic holders; 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 of which is connected to the two inner ball grooves, so as to jointly form two circulation passages arranged at intervals; and Two extension oil passages are respectively connected to the two steering passages, and the two extension oil passages are also respectively connected to the two transmission oil passages; and A plurality of rolling balls are respectively rotatably arranged in the two circulation channels; and An insert is inserted in the two plastic retainers, and the insert is limited to the positions of a plurality of the balls. The ball spline set according to claim 1, 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 1, 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 1, 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 1, wherein any one of the end caps includes a cap body and two caps detachably mounted on the cap body; in each of the end caps, the The cover body is formed with two extension oil passages, and each of the cover and the cover body together surrounds and forms one of the steering passages. The ball spline set according to claim 5, wherein two dust-proof ribs are formed on the inner edge of each cover body, which respectively correspond to the extension paths of the two inner bead grooves. The ball spline set according to claim 1, wherein the insert is further defined as a shaft, which includes two outer bead grooves formed on the outer edge thereof; wherein, the shaft passes through two In the plastic holder, the positions of the two outer bead grooves face the two inner bead grooves respectively. The ball spline set according to claim 1, wherein the insert is further defined as a clamp rail, which is detachably mounted on the spline; wherein, the clamp rail includes: A ball anti-dropping component includes a base plate and two elastic arms extending from the base plate, a gap is formed between the two elastic arms, and the two elastic arms penetrate the cylinder and face the two elastic arms respectively. The inner bead groove; and A positioning plate is detachably installed on the free ends of the two elastic arms away from the base plate, and the positioning plate and the base plate are respectively located on opposite sides of the spline. A spline of a ball spline group, which includes: A cylinder containing: A metal cylinder includes an inner surface, an outer surface, and two end surfaces connected between the inner surface and the outer surface; wherein, the metal cylinder includes two recessed surfaces on the inner surface. An inner bead groove, and two ball passages that penetrate from one of the end surfaces to the other of the end surfaces and are respectively adjacent to the two inner bead grooves; and Two plastic retainers are arranged on the inner surface of the metal cylinder at intervals, 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 Each of the plastic holders and the metal cylinder together form a transmission oil path; Two end caps are respectively installed on the two end faces of the metal cylinder and fix the two plastic holders; 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 of which is connected to the two inner ball grooves, so as to jointly form two circulation passages arranged at intervals; and Two extension oil passages are respectively connected to the two steering passages, and the two extension oil passages are also respectively connected to the two transmission oil passages; and A plurality of balls are respectively rollably arranged in the two circulation channels. The spline of the ball spline set according to claim 9, wherein the metal cylinder includes two penetrating oil passages penetrating from the outer surface to the inner surface, and the outer surface of each plastic retainer The rim is recessed to form an inner oil passage, 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 The transmission oil passage and the two extension oil passages are respectively connected to the two inner oil passages; wherein, the metal cylinder includes an outer oil passage recessed on the outer surface, and the outer oil passage The oil passage is connected to the two transmission oil passages; 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.

Images