CN207212942U - Roller spline group - Google Patents

Abstract

A roller spline set includes a spline shaft, an outer barrel, a plurality of roller caps, two end caps, and a plurality of rollers. The spline shaft has a shaft body and a plurality of track grooves. The outer cylinder is sleeved on the spline shaft and is provided with a plurality of roller grooves and a plurality of circulating grooves, and the roller grooves and the track grooves correspond to form a plurality of roller channels. The roller cover part is covered on the circulating groove to form a plurality of circulating channels, and the circulating channels are arranged corresponding to the roller channels. The end covers are arranged at two ends of the outer barrel and are provided with a plurality of backflow channels, and the backflow channels are connected with the roller channels and the circulating channels. The corresponding roller channels, circulation channels and return channels collectively form a plurality of roller circulation paths. The rollers are housed in the roller circulation path. The utility model has the advantages of can bear higher radial load.

Description

Roller spline set

technical field

The utility model relates to a roller spline group.

Background technique

The ball spline unit is a linear guide device in which the outer cylinder moves linearly on the spline shaft. Since the steel ball rolls on the spline groove, it is suitable for a mechanism that performs linear motion while transmitting torque.

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

Please refer to FIG. 1 , which is an exploded view of a known ball spline assembly 1 . The ball spline assembly 1 includes a spline shaft 11 , an outer cylinder 12 , an end cover 13 , a ball retainer 14 , and balls 15 circulating among these elements, and a dustproof member 16 is disposed on the end cover 13 . Wherein, the ball retainer 14 is disposed between the spline shaft 11 and the outer cylinder 12 , so that the balls 15 can maintain their position before assembly or when the outer cylinder 12 is separated from the spline shaft 11 to avoid falling. However, the ball retainer 14 is quite easy to be damaged under the cyclic motion of the balls 15 for a long time, which may cause vibrations when the balls 15 move. operator's operation risk.

Utility model content

The purpose of the present utility model is to provide a roller spline assembly, which can withstand relatively high radial loads in addition to the advantages of simple structure and low cost without using the known ball cage.

The utility model provides a roller spline group, which includes a spline shaft, an outer cylinder, 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 located on the surface of the shaft body. The outer cylinder is sheathed and slidably arranged on the spline shaft, and the outer cylinder has a plurality of roller grooves and a plurality of circulation grooves, and these roller grooves correspond to the track grooves to form a plurality of roller passages. The roller covers are arranged on the circulation grooves to form a plurality of circulation passages, and the circulation passages are arranged correspondingly to the roller passages. These end covers are sleeved on the spline shaft and are respectively arranged at both ends of the outer cylinder. These end covers have a plurality of return channels, and the two ends of each of these return channels are connected to each of these roller channels and each of these circulation channels, and correspond to The roller passages, the circulation passages and the return passages jointly form a plurality of roller circulation paths. The rollers are accommodated in the roller circulation paths.

In one embodiment, each circulation groove is a groove that is recessed in the direction of the spline shaft from the outer surface of the outer cylinder.

In one embodiment, each recirculation groove is opposite to each roller groove.

In one embodiment, on the radial section of the spline shaft, the axes of the track grooves, the recirculation grooves, the roller grooves and the spline shaft are located in the same radial direction.

In one embodiment, each recirculating groove extends in the axial direction of the spline shaft.

In one embodiment, each roller cover is closely connected with each circulation groove.

In one embodiment, the roller covers completely camber the surface of the outer cylinder.

In one embodiment, the recirculation groove is a dovetail groove configuration.

In one embodiment, the number of these track grooves is three, and on the radial section of the spline shaft, the arc angle of any two track grooves relative to the spline shaft is 120 degrees.

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

As mentioned above, in the roller spline set of the present invention, the roller passages are formed by the roller grooves of the outer cylinder corresponding to the track grooves, and the roller covers are set on the circulation grooves of the outer cylinder to form multiple circulations. channel, and the two ends of the return channel of the end cover are respectively connected to the roller channel and the circulation channel, and the corresponding roller channel, circulation channel and return channel together form a structural design of multiple roller circulation paths, so that the rollers can be rolled Cyclic movement within the column circulation path. As a result, the roller spline set of the present invention not only does not need to use the ball retainer of the known ball spline set, but has a simple structure and lower cost, it can also bear relatively high radial loads.

Description of drawings

FIG. 1 is an exploded schematic view of a known ball spline assembly.

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

FIG. 2C is a schematic diagram of an end cover of the roller spline assembly of the present invention.

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

FIG. 4A is a schematic cross-sectional view of the roller spline assembly shown in FIG. 2A along the section line A-A.

FIG. 4B is a partially enlarged schematic view of FIG. 4A .

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

Detailed ways

A roller spline set according to a preferred embodiment of the present invention will be described below with reference to 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 an assembly diagram and an exploded diagram of a roller spline assembly 2 according to an embodiment of the present invention.

As shown in FIGS. 2A and 2B , the roller spline assembly 2 of this embodiment includes a spline shaft 21 , an outer cylinder 22 , a plurality of roller covers 23 , two end covers 24 and a plurality of rollers 25 .

The spline shaft 21 has a shaft body 211 and a plurality of track grooves 212 . In this embodiment, the spline shaft 21 has three track grooves 212 located on the surface of the shaft body 211 as an example, however, the number of track grooves 212 is not limited to this according to application requirements. In other embodiments, the spline shaft 21 may have other numbers of track grooves 212 . In terms of production, the shaft body 211 can be machined and ground simultaneously by using a grinding device, so that three track grooves 212 can be fabricated in one operation.

The outer cylinder 22 can also be called a spline nut, which is a cylindrical metal piece with two ends open. The outer cylinder 22 is sheathed and slidably disposed on the spline shaft 21 . In actual operation, the gap between the outer cylinder 22 and the spline shaft 21 may be 0.05 mm to 1 mm. However, the utility model is not limited thereto. The outer cylinder 22 has a plurality of roller grooves 221 and a plurality of circulation grooves 222 corresponding to the number of the track grooves 212 . Wherein, the roller groove 221 is an elongated groove located inside the outer cylinder 22 and passing through two ends of the outer cylinder 22 .

In addition, the circulation groove 222 in this embodiment is a groove recessed in the direction of the spline shaft 21 from the outer surface of the outer cylinder 22 , and extends along the axial direction of the spline shaft 21 . What should be explained first is that in the known ball spline assembly, the circulation channel after the balls return is generally made in the form of a through hole on the outer cylinder, so the construction is difficult and the precision control is not easy. Moreover, the outer wall of the outer cylinder It is also easy to break during processing. Even if the through hole of the outer cylinder can be made successfully, the outer wall between the through hole and the surface of the outer cylinder will be thin, and the rigidity or strength may be insufficient, and the balls are also easily broken during movement. However, since the recirculating groove 222 in this embodiment is not a through hole, it is not only easier to manufacture, but also easier to control the precision, and the roller 25 is not easily broken or damaged when it moves.

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

Please refer to FIG. 3 , which is a schematic axial cross-sectional view of the roller spline set 2 shown in FIG. 2A . Firstly, to make the drawing simple and easy for readers to understand the creation of this embodiment, FIG. 3 only shows a series of rollers 25 and two roller covers 23 . However, the utility model is not limited thereto. The number of rollers 25 and roller cover 23 preferably corresponds to the number of track grooves 212 , roller grooves 221 and 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 covers 23 respectively cover the circulation grooves 222 of the outer cylinder 22 . Here, the side of the roller cover 23 facing the spline shaft 21 has a concave portion 231, and a part of the concave portion 231 and the circulation groove 222 forms a plurality of circulation channels R2, and the circulation channels R2 can form the circulation of the roller 25. Channels for the rollers 25 to limit their movement direction and position when circulating backflow. Wherein, the shape of the roller cover 23 corresponds to the shape of the circulation groove 222, and each roller cover 23 is closely connected with each corresponding circulation groove 222, so that the roller cover 23 covers the outer cylinder 22. The surface can make the outer surface of the outer cylinder 22 form a complete arc. In addition, these circulation channels R2 are respectively provided corresponding to these roller channels R1. Here, the circulation channel R2 and the corresponding roller channel R1 are respectively located on two opposite sides of the outer cylinder 22 (there is a structure between them).

Please refer to FIG. 2B , FIG. 2C and FIG. 3 again, wherein FIG. 2C is a schematic diagram of the end cover 24 of the roller spline assembly 2 of the present invention. Each end cap 24 has a plurality of return channels R3 respectively. Since the present embodiment takes the spline shaft 21 having three track grooves 212 as an example, each end cover 24 preferably has three return channels R3 to correspond to the structure of each element. However, the utility model is not limited thereto. Moreover, in order to keep the drawing simple, FIG. 3 only shows two recirculation channels R3 for illustration.

The two end caps 24 are sheathed on the spline shaft 21 and respectively arranged at both ends of the outer cylinder 22, so that the return channel R3 of the end cover 24 can correspond to the roller channel R1 and the circulation channel R2, and the two ends of the return channel R3 are respectively Connect the roller channel R1 and the circulation channel R2. Specifically, the two ends of each return channel R3 are respectively connected with a corresponding roller channel R1 and a circulation channel R2, so as to jointly form a plurality of roller circulation paths RP, so that the rollers 25 can be accommodated in the roller Circular movement within the cyclic path RP.

In addition, in order to facilitate processing on the end cap 24 to make the return channel R3, each end cap 24 in this embodiment can have an end cap body 241 and a plurality of channel forming parts 242, and these channel forming parts 242 can be respectively arranged on the end caps body 241 to form these return channels R3 on the end cap 24 . As shown in Figure 3, at the position corresponding to each return channel R3, three arc-shaped recesses can be processed on one side of the end cover body 241 corresponding to the position of the return channel R3, and then the arc-shaped recesses Two arc-shaped grooves 2411 are processed on both sides of the two sides. Since one side of the channel forming member 242 is a protruding arc shape corresponding to the arc-shaped groove 2411, the channel forming member 242 can be respectively embedded in these grooves. 2411 inside. Here, in addition to making the side surface 243 of the end cap body 241 flat so as to be attached to the outer tube 22 , the channel forming member 242 can also form the end cap 24 to form the return channel R3 .

Therefore, when the roller 25 moves to the position of the end cover 24 in the roller channel R1, it will be guided to the circulation channel R2 along the return channel R3 of the end cover 24 to generate repeated circular movement. Specifically, the roller 25 can be guided into the return channel R3 along the roller channel R1 along the arc structure design of the return channel R3 of the end cover 24, and then guide it to the corresponding circulation channel through the return channel R3 In R2; when the roller 25 moves from the circulation channel R2 to the end cover 24 at the other end, it can pass through the arc surface structure design of the return channel R3 of the other end cover 24, and then guide it back to the corresponding roller channel R1 , to form a circular motion.

Please refer to FIGS. 4A and 4B , wherein FIG. 4A is a schematic cross-sectional view of the roller spline set 2 shown in FIG. 2A on the section line A-A, and FIG. 4B is a partially enlarged schematic view of FIG. 4A .

In FIGS. 4A and 4B , the circulation groove 222 is a dovetail groove configuration. Specifically, the circulation groove 222 has two inner sidewalls 2221 connected with the roller cover 23, and in the radial section, the shortest distance between the two inner sidewalls 2221 away from the spline shaft 21 is greater than that of the two inner sidewalls. 2221 are located near the spline shaft 21 at the shortest distance from each other (narrower on the outside, wider on the inside). Since the width of the recirculating groove 222 becomes smaller as it approaches the surface of the outer cylinder 22, the radial support force of the roller cover 23 (the ability to resist the radial impact of the roller 25 during rolling) also decreases. The stronger the roller cover 23 is, the harder it is to separate from the outer cylinder 22 when the roller 25 moves in the roller circulation path RP. In terms of installation, the roller cover 23 can be inserted into the circulation groove 222 from one end of the outer cylinder 22, so that the roller cover 23 is closely connected with the circulation groove 222, so the installation is quite easy.

In addition, on the radial section of the spline shaft 21 , the orbital grooves 212 , the recirculating grooves 222 , the roller grooves 221 and the axis O of the spline shaft 21 are located in the same radial direction. In other words, on the radial section, the centers of the track grooves 212 , the recirculating grooves 222 , the roller grooves 221 and the axis O of the spline shaft 21 are connected in a straight line. In addition, since the number of track grooves 212 is three, the arc angle θ of any two track grooves 212 relative 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 On the radial cross-section, they can be connected to form a triangle (triangular contact), so that the outer cylinder 22 can be more evenly loaded. In addition, because the rollers 25 are in line contact on the track grooves 212 of the spline shaft 21 (the known ball spline set is point contact), so compared with the ball spline set 1 in FIG. The roller spline set 2 has a simple structure and lower cost without using a known ball cage, and can also bear a relatively high radial load.

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

The main difference from the roller spline set 2 of FIG. 2B is that the two end covers 24 of the roller spline set 2a of this embodiment do not include a channel forming member 242, but are formed on the end covers of each end cover 24a. Three return channels R3 are directly processed on the body.

In addition, other technical features of the roller spline set 2 a can refer to the same elements of the roller spline set 2 , and will not be repeated here.

To sum up, in the roller spline set of the present invention, the roller channel is formed through the roller groove of the outer cylinder corresponding to the track groove, and the roller cover is set on the circulation groove of the outer cylinder to form a plurality of circulation channel, and the two ends of the return channel of the end cover are respectively connected to the roller channel and the circulation channel, and the corresponding roller channel, circulation channel and return channel together form a structural design of multiple roller circulation paths, so that the rollers can be The roller circulates in the circulation path. As a result, the roller spline set of the present invention can withstand relatively high radial loads in addition to having a simple structure and low cost without using the ball cage of the known ball spline set.

The above description is for illustration only, not limitation. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the appended claims.

Claims (10)

1. A kind of 1. roller spline group, it is characterised in that including：

   Splined shaft, has shaft body and multiple rail grooves, and the rail groove is located at the surface of the shaft body；

   Outer barrel, it is arranged and is slideably positioned in the splined shaft, the outer barrel has multiple roller slots and multiple circulation grooves, institute State roller slot and be correspondingly formed multiple roller passages with the rail groove；

   Multiple roller cover pieces, the circulation groove is covered on to form multiple circulation canals, the circulation canal and the roller Passage is correspondingly arranged；

   Two end caps, are sheathed on the splined shaft, and are respectively arranged at the both ends of the outer barrel, and each end cap has multiple times Circulation road, the both ends of each return flow line connect each roller passage and each circulation canal, and corresponding institute respectively State roller passage, the circulation canal and the return flow line and be collectively forming multiple roller circulating paths；And

   Multiple rollers, it is placed in the roller circulating path.
2. 2. roller spline group according to claim 1, it is characterised in that wherein each circulation groove is by the outer barrel Appearance towards the splined shaft direction be recessed groove.
3. 3. roller spline group according to claim 1, it is characterised in that wherein each circulation groove and each roller Groove is oppositely arranged.
4. 4. roller spline group according to claim 3, it is characterised in that wherein, on the radial section of the splined shaft, Each rail groove, each circulation groove, the axle center of each roller slot and the splined shaft are located at same radial direction On.
5. 5. roller spline group according to claim 1, it is characterised in that wherein each circulation groove is along the splined shaft Axial direction extension.
6. 6. roller spline group according to claim 1, it is characterised in that wherein each roller cover piece respectively with it is each described Circulation groove closely connects.
7. 7. roller spline group according to claim 1, it is characterised in that wherein described roller cover piece makes the table of the outer barrel Face forms complete cambered surface.
8. 8. roller spline group according to claim 1, it is characterised in that wherein described circulation groove is dovetail groove configuration.
9. 9. roller spline group according to claim 1, it is characterised in that the quantity of wherein described rail groove is 3, in institute State on the radial section of splined shaft, rail groove described in any two is 120 degree relative to the axle center arc angle of the splined shaft.
10. 10. roller spline group according to claim 1, it is characterised in that wherein each end cap has end cap sheet respectively Body and multiple passages form part, and the passage forms part and is respectively arranged at the end cap body, to be formed on the end cap The return flow line.