TWM554527U - Roller spline assembly - Google Patents

Abstract

A roller spline assembly includes a spline-shaft, an outer-tube, a plurality of roller-covers, two end-covers and a plurality of rollers. The spline-shaft has a shaft body and a plurality of track grooves. The outer-tube is disposed at the shaft body and has a plurality of roller grooves and cycle grooves. The roller grooves and the track grooves are formed a plurality of roller channels. The roller-covers are covered at the cycle grooves to form a plurality of cycle channels. The cycle channels are disposed corresponding to the roller channels. The end-covers are disposed at the two ends of the outer-tube and have a plurality of return channels. The return channels are connected with the roller channels and the cycle channels. The roller channels, the cycle channels and the return channels are co-formed a plurality of roller cycle paths. The rollers are disposed inside the roller cycle paths.

Description

Roller spline set

This novel creation is about a roller spline set.

The ball spline set is a linear guide device in which the outer cylinder linearly moves on the spline shaft. Since the steel ball is rolled on the spline groove, it is suitable for a mechanism for linearly moving while transmitting torque.

In various ball spline groups, the ball cage plays a central role. On the one hand, it must have sufficient rigidity to guide the ball rolling, and on the other hand, the structure has extremely high precision requirements to avoid the operation of the whole assembly. Poor performance or unusual noise.

Referring to FIG. 1 , FIG. 1 is an exploded perspective view of a conventional ball spline set 1 . The ball spline set 1 includes a spline shaft 11, an outer cylinder 12, an end cover 13, a ball retainer 14, and balls 15 that circulate between the components, and a dustproof member 16 is disposed at the end cap 13. Among them, the ball retainer 14 is disposed between the spline shaft 11 and the outer cylinder 12, so that the ball 15 can maintain its position to avoid falling before assembly or when the outer cylinder 12 is separated from the spline shaft 11. However, the ball retainer 14 is relatively easy to be damaged under the cyclic motion of the ball 15 for a long time, and thus the vibration may occur when the ball 15 moves, especially when the ball 15 moves at a high speed, the probability of the ball 15 falling off is increased. , causing the risk of user operation.

The purpose of the novel creation is to provide a roller spline set which can withstand higher radial loads in addition to the advantages of simple structure and reduced cost without the use of conventional ball retainers.

The novel creation proposes a roller spline set comprising a spline shaft, an outer cylinder, a plurality of roller cover members, a two-end cover and a plurality of rollers. The spline shaft has a shaft body and a plurality of track grooves. The track grooves are located on the surface of the shaft body. The outer cylinder is sleeved and slidably disposed on the spline shaft, and the outer cylinder has a plurality of roller slots and a plurality of circulating grooves, and the roller grooves corresponding to the track grooves form a plurality of roller passages. The roller cover members are disposed on the circulation grooves to form a plurality of circulation passages, and the circulation passages are disposed corresponding to the roller passages. The end caps are sleeved on the spline shafts and are respectively disposed at two ends of the outer cylinders. The end caps have a plurality of return passages, and the two ends of the return passages respectively connect the roller passages and the respective ones. The circulation channel, and the corresponding roller channels, the circulation channels and the return channels together form a plurality of roller circulation paths. The rollers are accommodated in the roller circulation paths.

In an embodiment, each of the circulating grooves is a groove recessed from the outer surface of the outer cylinder toward the direction of the spline shaft.

In an embodiment, each of the circulating grooves is disposed opposite to each of the roller grooves.

In one embodiment, in a radial section of the spline shaft, each of the track grooves, each of the circulating grooves, each of the roller grooves, and the axis of the splined shaft are in the same radial direction.

In an embodiment, each of the circulating grooves extends in the axial direction of the spline shaft.

In one embodiment, each roller cover member is intimately coupled to each of the circulation grooves.

In one embodiment, the roller cover members form a complete curved surface on the surface of the outer cylinder.

In an embodiment, the circulating groove is a dovetail configuration.

In one embodiment, the number of track grooves is three. On a radial section of the spline shaft, the arc angle of any two track grooves with respect to the spline axis is 120 degrees.

In one embodiment, each of the end caps has an end cap body and a plurality of channel forming members, and the channel forming members are respectively disposed on the end cap body to form the return channels on the end caps.

According to the above description, in the roller group of the novel creation, the roller channel corresponding to the track groove is formed by the roller groove of the outer cylinder, and the roller cover member is disposed on the circulating groove of the outer cylinder to form a plurality of a circulation passage, and two ends of the return passage of the end cover are respectively connected to the roller passage and the circulation passage, and the corresponding roller passage, the circulation passage and the return passage jointly form a structural design of the plurality of roller circulation paths, so that the roller can be rolled Cyclic motion within the column circulation path. Thereby, the roller spline group of the novel creation can withstand the high radial load in addition to the ball cage of the conventional ball spline group, which has the advantages of simple structure and low cost.

1‧‧‧Ball Spline Set

11, 21‧‧‧ spline shaft

12, 22‧‧‧ outer cylinder

13, 24, 24a‧‧‧ end caps

14‧‧‧Ball retainer

15‧‧‧ balls

16‧‧‧Dust-proof parts

2, 2a‧‧ ‧ Roller spline set

211‧‧‧Axis body

212‧‧‧ Track slot

221‧‧‧Roller groove

222‧‧‧Circular groove

2221‧‧‧ inner side wall

23‧‧‧Roller cover

231‧‧‧ recess

241‧‧‧End cap body

2411‧‧‧ Groove

242‧‧‧Channel forming parts

243‧‧‧ side

25‧‧‧roller

A-A‧‧‧ hatching

O‧‧‧Axis

R1‧‧‧Roller channel

R2‧‧‧ cycle channel

R3‧‧‧ return channel

RP‧‧‧Roll cycle path

θ‧‧‧Arc angle

FIG. 1 is an exploded perspective view of a conventional ball spline set.

FIG. 2A and FIG. 2B are respectively a schematic diagram and a schematic exploded view of a roller spline set according to an embodiment of the present invention.

2C is a schematic view of the end cap of the roller group of the novel creation.

3 is a schematic axial cross-sectional view of the roller spline set shown in FIG. 2A.

4A is a schematic cross-sectional view of the roller spline set of FIG. 2A taken along section line A-A.

4B is a partial enlarged view of FIG. 4A.

FIG. 5 is an exploded perspective view of a roller spline set according to another embodiment of the present invention.

The roller spline set according to the preferred embodiment of the present invention will be described with reference to the related drawings, wherein the same elements will be described with the same reference numerals.

Please refer to FIG. 2A and FIG. 2B , which are respectively a schematic diagram and a schematic exploded view of a roller spline set 2 according to an embodiment of the present invention.

As shown in FIGS. 2A and 2B, the roller spline set 2 of the present embodiment includes a spline shaft 21, an outer cylinder 22, a plurality of roller cover members 23, a two-end cover 24, and a plurality of rollers 25.

The spline shaft 21 has a shaft body 211 and a plurality of track grooves 212. In the present embodiment, the spline shaft 21 has three track grooves 212 on the surface of the shaft body 211. However, the number of the track grooves 212 is not limited thereto, and the end view is required for application. In other embodiments, the spline shaft 21 can have other numbers of track slots 212. In terms of production, the shaft body 211 can be simultaneously ground and polished by using a grinding device, so that the plurality of track grooves 212 can complete the three track grooves 212 in one operation.

The outer cylinder 22 may also be referred to as a spline nut, which is a tubular metal member that is open at both ends. The outer cylinder 22 is sleeved and slidably disposed on the spline shaft 21. In practice, the gap between the outer cylinder 22 and the spline shaft 21 can be from 0.05 mm to 1 mm. However, this novel creation is not limited by this. The outer cylinder 22 has a plurality of roller grooves 221 and a plurality of circulating grooves 222 corresponding to the number of track grooves 212. The roller groove 221 is an elongated groove and is located inside the outer cylinder 22 and penetrates the outer cylinder 22 . Both ends.

Further, the circulation groove 222 of the present embodiment is a groove recessed from the outer surface of the outer cylinder 22 toward the spline shaft 21, and extends in the axial direction of the spline shaft 21. First, in the conventional ball spline group, the circulation passage after the ball recirculation is generally formed into a through hole on the outer cylinder, so that the construction is difficult and the precision control is not easy, and the outer side wall of the outer cylinder is also difficult. It is also easy to break during processing. Even if the through hole of the outer cylinder can be made successfully, the outer side wall between the through hole and the outer cylinder surface is thin, rigidity or strength may be insufficient, and the ball is easily broken when moving. However, since the circulation groove 222 of the present embodiment is not a type of through hole, it is not only easy to manufacture but also easy to control, and the roller 25 is less likely to be broken or damaged during movement.

More specifically, the outer cylinder 22 of the present embodiment is a structural design without a flange as an example. However, it is not limited thereto. In other embodiments, one end or both ends of the outer cylinder 22 may also have a flange to increase the application range of the roller spline set. In addition, the plurality of roller cover members 23 illustrated in FIG. 2B have the same structure but different angles of presentation. In the present embodiment, the roller cover member 23 is an elongated member having a substantially U-shaped cross section, which can limit and maintain the rolling direction and radial displacement of the roller 25 to prevent falling.

Please refer to FIG. 3, which is an axial cross-sectional view of the roller spline set 2 shown in FIG. 2A. First, in order to make the drawing simple and convenient for the reader to understand the creation of the embodiment, FIG. 3 only shows a series of rollers 25 and two roller cover members 23. However, this novel creation is not limited by this. The number of the rollers 25 and the roller cover members 23 preferably corresponds to the number of the track grooves 212, the roller grooves 221, and the circulation grooves 222.

In FIG. 3, the corresponding track grooves 212 and the corresponding roller grooves 221 can jointly form a plurality of roller channels R1 for the rollers 25 to roll on the shaft body 211. In addition, the roller cover members 23 are respectively disposed on the circulation grooves 222 of the outer cylinder 22. Here, the roller cover member 23 has a concave portion 231 facing the spline shaft 21, and the concave portion 231 forms a plurality of circulation passages R2 with a portion of the circulation groove 222, and the circulation passage R2 can constitute the roller 25 for circulating backflow. The passage of time for the roller 25 to limit its direction and position of movement during cyclic recirculation. The shape of the roller cover member 23 corresponds to the shape of the circulation groove 222, and each roller cover member 23 is closely connected to the corresponding circulation groove 222, so that the roller cover member 23 covers the outer cylinder 22. When the surface is formed, the outer surface of the outer cylinder 22 can be shaped Into a complete arc. In addition, the circulation channels R2 are respectively disposed corresponding to the roller channels R1. Here, the circulation passage R2 and the corresponding roller passage R1 are respectively located on opposite sides of the outer cylinder 22 (having a structure therebetween).

Referring to FIG. 2B, FIG. 2C and FIG. 3, FIG. 2C is a schematic view of the end cap 24 of the novel roller spline set 2 of the present invention. Each of the end caps 24 has a plurality of return passages R3. Since the present embodiment is exemplified by the fact that the spline shaft 21 has three track grooves 212, each end cover 24 preferably has three return passages R3 to correspond to the respective element structures. However, this novel creation is not limited by this. Moreover, in order to simplify the drawing, FIG. 3 only shows two return channels R3 for illustration.

Two end caps 24 are sleeved on the spline shaft 21 and respectively disposed at two ends of the outer cylinder 22, so that the return passage R3 of the end cap 24 can correspond to the roller passage R1 and the circulation passage R2, and both ends of the return passage R3 Connect the roller channel R1 and the circulation channel R2, respectively. In detail, the two ends of each return channel R3 are respectively connected with a corresponding one of the roller channels R1 and one of the circulation channels R2 to jointly form a plurality of roller circulation paths RP, so that the rollers 25 can be accommodated in the rollers Loop motion within the loop path RP.

In addition. In order to facilitate the processing on the end cover 24 to form the return passage R3, each end cover 24 of the present embodiment may have an end cover body 241 and a plurality of passage forming members 242, respectively, and the passage forming members 242 may be respectively disposed on the end cover body 241. The return channels R3 are formed on the end cover 24. As shown in FIG. 3, at the position corresponding to each of the return passages R3, three arc-shaped recesses may be formed at a position corresponding to the return passage R3 on one side of the end cap body 241, and then in the arc-shaped recess. Two curved grooves 2411 are formed on the two sides. Since one side of the channel forming member 242 is a protruding arc shape corresponding to the curved groove 2411, the channel forming members 242 can be respectively embedded in the holes. Inside the groove 2411. Here, the channel forming member 242 can make the end cover 24 form the return passage R3, except that one side surface 243 of the end cap body 241 is a flat surface to be attached to the outer tube 22.

Therefore, when the roller 25 moves to the position of the end cover 24 in the roller passage R1, it is guided to the circulation passage R2 along the return passage R3 of the end cover 24, resulting in a repetitive cyclic motion. Specifically, the roller 25 can be guided along the roller channel R1 along the arcuate structure of the return channel R3 of the end cover 24 into the return channel R3, and then guided to the corresponding channel by the return channel R3. In the circulation passage R2; when the roller 25 is moved from the circulation passage R2 to the end cover 24 at the other end, the arcuate structure of the return passage R3 of the other end cover 24 can be designed and guided back to the corresponding roller. In channel R1, to form a cyclic motion.

4A and 4B, wherein FIG. 4A is a cross-sectional view of the roller spline group 2 shown in FIG. 2A along a section line A-A, and FIG. 4B is a partially enlarged view of FIG. 4A.

In Figures 4A and 4B, the circulation groove 222 is a dovetail configuration. Specifically, the circulation groove 222 has two inner side walls 2221 connected to the roller cover member 23. In the radial cross section, the two inner side walls 2221 are away from the spline shaft 21, and the shortest distance from each other is greater than the two inner side walls 2221. Located at a shortest distance from each other near the spline shaft 21 (the outer side is narrower and the inner side is wider). Since the circulation groove 222 is closer to the width of the surface of the outer cylinder 22, the radial supporting force of the roller cover member 23 (the ability to resist the radial impact of the roller 25 on the rolling process) is also Strongly, when the roller 25 moves in the roller circulation path RP, the roller cover member 23 is not easily separated from the outer cylinder 22. In the mounting, the roller cover member 23 can be inserted into the circulation groove 222 from one end of the outer cylinder 22, so that the roller cover member 23 is tightly connected to the circulation groove 222, and therefore, it is also relatively easy to mount.

Further, in the radial cross section of the spline shaft 21, the respective track grooves 212, the respective circulation grooves 222, the respective roller grooves 221, and the axis O of the spline shaft 21 are located in the same radial direction. In other words, in the radial section, the center of each track groove 212, the center of each of the circulating grooves 222, the center of each roller groove 221, and the axis O of the spline shaft 21 are connected in a straight line. In addition, since the number of the track grooves 212 is three, the arc angle θ of any two track grooves 212 with respect to the axis O of the spline shaft 21 is 120 degrees, so that the load of the roller 25 on the spline shaft 21 is made. A triangular shape (triangular eating point) can be connected in the radial section so that the outer cylinder 22 can be more evenly loaded. In addition, since the roller 25 is in line contact with the track groove 212 of the spline shaft 21 (the conventional ball spline group is point contact), the present embodiment is compared with the ball spline group 1 of FIG. The roller spline group 2 of the example can withstand higher radial loads in addition to the conventional ball retainer without the need for a simple structure and a reduced cost.

In addition, please refer to FIG. 5, which is an exploded perspective view of a roller spline set 2a according to another embodiment of the present invention.

The main difference from the roller spline set 2 of FIG. 2B is that the roller of this embodiment The two end caps 24 of the spline set 2a do not include the channel forming member 242, but are directly machined on the end cap body of each end cap 24a to form three return passages R3.

In addition, other technical features of the roller spline group 2a can refer to the same components of the roller spline group 2, and will not be described again.

In summary, in the roller group of the present invention, the roller groove corresponding to the track groove is formed by the roller groove of the outer cylinder, and the roller cover is disposed on the circulating groove of the outer cylinder to form a plurality of a circulation passage, and two ends of the return passage of the end cover are respectively connected to the roller passage and the circulation passage, and the corresponding roller passage, the circulation passage and the return passage jointly form a structural design of the plurality of roller circulation paths, so that the roller can be rolled Cyclic motion within the column circulation path. Thereby, the roller spline group of the novel creation can withstand the high radial load in addition to the ball cage of the conventional ball spline group, which has the advantages of simple structure and low cost.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the novel creations are intended to be included in the scope of the appended claims.

2‧‧‧Roller spline set

21‧‧‧ Splined shaft

211‧‧‧Axis body

212‧‧‧ Track slot

22‧‧‧Outer tube

221‧‧‧Roller groove

222‧‧‧Circular groove

23‧‧‧Roller cover

231‧‧‧ recess

24‧‧‧End cover

241‧‧‧End cap body

242‧‧‧Channel forming parts

25‧‧‧roller

R1‧‧‧Roller channel

R2‧‧‧ cycle channel

R3‧‧‧ return channel

RP‧‧‧Roll cycle path

Claims (10)

A roller spline set includes: a spline shaft having a shaft body and a plurality of track grooves, wherein the track grooves are located on a surface of the shaft body; and an outer cylinder is sleeved and slidably disposed on the spline shaft, the outer The cylinder has a plurality of roller grooves and a plurality of circulating grooves, and the roller grooves and the track grooves respectively form a plurality of roller channels; the plurality of roller cover members are disposed on the circulating grooves to form a plurality of circulating channels, The circulation passages are disposed corresponding to the roller passages; the two end covers are sleeved on the spline shafts and respectively disposed at two ends of the outer cylinder, and each of the end covers has a plurality of return passages, and the return passages of the respective return passages The two ends of the roller channel and the respective circulation channels are respectively connected, and the corresponding roller channels, the circulation channels and the return channels jointly form a plurality of roller circulation paths; and the plurality of rollers are accommodated For these roller cycle paths. The roller spline set of claim 1, wherein each of the circulating grooves is a groove recessed from an outer surface of the outer cylinder toward the spline shaft. The roller spline set of claim 1, wherein each of the circulating grooves is disposed opposite to each of the roller slots. The roller spline set of claim 3, wherein, in a radial section of the spline shaft, each of the track grooves, each of the circulating grooves, each of the roller grooves, and the spline The axes of the shafts are in the same radial direction. The roller spline set of claim 1, wherein each of the circulating grooves extends in an axial direction of the spline shaft. The roller spline set of claim 1, wherein each of the roller cover members is closely connected to each of the circulating grooves. The roller spline set of claim 1, wherein the roller cover members form a complete curved surface of the outer cylinder. The roller spline set of claim 1, wherein the circulating groove is a dovetail configuration. The roller spline set of claim 1, wherein the number of the track grooves is three, and in the radial section of the spline shaft, any two of the track grooves are opposite to the flower The axis angle of the key axis is 120 degrees. The roller spline set of claim 1, wherein each of the end caps has an end cap body and a plurality of channel forming members, and the channel forming members are respectively disposed on the end cap body for the end cap The return channels are formed on the upper surface.