CN207212941U - Roller spline group - Google Patents

Abstract

The utility model discloses a roller spline group. The roller spline set includes a spline shaft, an outer barrel, a plurality of roller retainers, a plurality of circulating sleeve sets, two end caps, and a plurality of rollers. The roller groove of the outer cylinder is arranged corresponding to the circulating through hole. The roller retainer, the bearing surface of the track groove and the roller groove correspondingly form a plurality of roller channels. The circulating sleeve groups are correspondingly arranged in the circulating through holes to form a plurality of circulating channels. The end covers are arranged at two ends of the outer barrel and are provided with a plurality of backflow channels, two ends of each backflow channel are respectively connected with the roller channels and the circulating channels, and the corresponding roller channels, the circulating channels and the backflow channels jointly form a plurality of roller circulating 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, in the ball spline set 1 in FIG. 1 , due to the structural design of the balls 15 and the ball cage 14, when the ball spline set 1 bears a high radial load for a long time, the ball cage 14 is equivalent. It is easy to be damaged, which in turn may cause vibration when the ball 15 moves, especially when the ball 15 moves at a high speed, which further increases the probability of the ball 15 falling off, resulting in a risk in the user's operation.

Utility model content

The purpose of this utility model is to provide a roller spline set different from the known ones. The roller spline set of the utility model can bear relatively high radial load.

The utility model provides a roller spline group, which includes a spline shaft, an outer cylinder, a plurality of roller holders, a plurality of circulating sleeve groups, two end covers and a plurality of rollers. The spline shaft has a shaft body and a plurality of track grooves, each track groove is located on the surface of the shaft body and has two bearing surfaces. 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 through holes, and the roller grooves are arranged correspondingly to the circulation through holes. The roller holders are correspondingly arranged in the track grooves, and the roller holders, the bearing surfaces of the track grooves and the roller grooves correspondingly form a plurality of roller passages. The plurality of circulation sleeve groups are correspondingly arranged in the circulation through holes to form a plurality of circulation passages, and the circulation passages are arranged corresponding 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 multiple return channels, and the two ends of each return channel are respectively connected to each roller channel and each circulation channel, and the corresponding rollers The column 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 one embodiment, the number of the roller grooves or the circulation through holes is twice that of the track grooves.

In one embodiment, each roller groove has a setting surface, and the setting surface is opposite to the bearing surface.

In one embodiment, each roller groove further has a first side connected to the setting surface, each roller retainer has a second side opposite to the first side, the second side is adjacent to the bearing surface, the bearing surface, The setting surface, the first side and the second side jointly form a roller channel.

In one embodiment, each roller retainer is disposed in each corresponding track groove along the axial direction of the spline shaft.

In one embodiment, one roller retainer forms two roller passages with the splined shaft and the outer cylinder.

In one embodiment, each circulation sleeve group has a plurality of sleeves which form a circulation channel.

In one embodiment, on the radial section of the spline shaft, the circulation paths of the rollers located on the same side of the spline shaft are intersecting.

In one embodiment, the number of the roller passages and the circulation passages are four respectively, and on the radial section of the spline shaft, the extension of the connection lines between the roller passages and the corresponding circulation passages forms a quadrilateral.

In one embodiment, each circulation sleeve group has a plurality of sleeves which form a circulation channel.

In one embodiment, the two ends of each circulating sleeve group are respectively connected to the side faces of the end caps facing the outer cylinder.

In one embodiment, each sleeve of the circulation sleeve group has a straight cylinder and a protrusion respectively, and these straight cylinders are arranged in the circulation through hole, and the end cap has a recess corresponding to these protrusions, and these protrusions are arranged in the depression department.

In one embodiment, the outer sides of the protruding parts of the circulation sleeve set have a first arcuate surface, and the end cap further has a second arcuate surface, and the first arcuate surface and the second arcuate surface together form a return flow channel.

As mentioned above, in the roller spline set of the present invention, the roller retainer is correspondingly arranged in the track groove of the spline shaft, so that the roller retainer, the bearing surface of the track groove and the roller groove of the outer cylinder A plurality of roller passages can be formed correspondingly. In addition, the circulation sleeve group is correspondingly arranged in the circulation through hole to form a plurality of circulation passages. The roller channel, circulation channel and return channel together form a structural design of multiple roller circulation paths, so that the rollers can circulate in the roller circulation path. Therefore, since the roller spline set of the present invention utilizes the rollers to move through the roller channel on the spline shaft, the roller spline set of the present invention can withstand 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. 3 is a schematic 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 the roller spline set shown in FIG. 4A .

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

Fig. 6A is an exploded schematic diagram of a circulation sleeve assembly according to another embodiment of the present invention.

FIG. 6B and FIG. 6C are schematic diagrams of a circulation sleeve set and an end cap of another embodiment of the present invention, respectively.

FIG. 6D is a schematic diagram of the combination of two circulating sleeve sets and corresponding rollers according to another embodiment of the present invention.

Fig. 6E is a combined schematic diagram of two circulating sleeve sets according to another embodiment of the present invention.

Detailed ways

The following will describe the roller spline set according to the preferred embodiment of the present invention 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 an assembly diagram and an exploded diagram of a roller spline assembly 2 according to an embodiment of the present invention. The roller spline set 2 of this embodiment includes a spline shaft 21 , an outer cylinder 22 , a plurality of roller holders 23 , a plurality of circulating sleeve sets 24 , two end caps 25 and a plurality of rollers 26 .

The spline shaft 21 has a shaft body 211 and a plurality of track grooves 212 , and each track groove 212 is located on a surface of the shaft body 211 . In this embodiment, the spline shaft 21 has two track grooves 212 located on opposite surfaces 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 two 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 through holes 222 , and the roller grooves 221 are arranged corresponding to the circulation through holes 222 . Specifically, the number of the roller grooves 221 and the circulating through holes 222 are the same and opposite to each other, and the number of the roller grooves 221 or the circulating through holes 222 is twice the number of the track grooves 212 of the spline shaft 21 . In this embodiment, the number of track grooves 212 is 2, the number of roller grooves 221 and circulation through holes 222 are respectively 4, and two roller grooves 221 and two circulation through holes 222 correspond to one track groove 212.

The roller groove 221 of this embodiment is a V-shaped long groove, located inside the outer cylinder 22 , extending along the axial direction of the spline shaft 21 and passing through both ends of the outer cylinder 22 . The circulation through hole 222 also extends along the axial direction of the spline shaft 21 and penetrates both ends of the outer cylinder 22 . In terms of production, V-shaped grooves can be processed on the inner side of the outer cylinder 22 to form roller grooves 221 , and both sides of the outer cylinder 22 can be processed (eg, drilled) to form circulation through holes 222 . In actual operation, the cross section of the circulation through hole 222 may be circular, which is easy to construct.

It should also be noted that the outer cylinder 22 in 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.

These roller holders 23 are correspondingly arranged in these track grooves 212 of the spline shaft 21, and these roller holders 23, these track grooves 212 and these roller grooves 221 correspondingly form a plurality of roller channels R1 (not shown in FIG. 2B marked, which will be explained below). In this embodiment, the number of the roller holders 23 corresponds to the number of the track grooves 212, and each is two. Wherein, each roller holder 23 is arranged in each corresponding track groove 212 along the axial direction of the spline shaft 21, and one roller holder 23 forms a roller corresponding to one track groove 212 and one roller groove 221. The same roller holder 23 corresponds to the same track groove 212 and another roller groove 221 to form another roller passage R1. Therefore, the number of roller passages R1 in this embodiment corresponds to the number of roller grooves 221 (or circulation through holes 222 ), which are four.

Please refer to FIG. 2B and FIG. 3 , wherein FIG. 3 is a schematic cross-sectional view of the roller spline set 2 shown in FIG. 2A . Firstly, in order to make the drawing simple and easy for readers to understand the creation of this embodiment, FIG. 3 only shows one roller retainer 23 , two string rollers 26 and two circulating sleeve sets 24 on one side. However, the utility model is not limited thereto. The number of roller holders 23 , rollers 26 and circulation sleeve sets 24 preferably corresponds to the number of roller grooves 221 and circulation through holes 222 .

As shown in FIG. 2B and FIG. 3 , the roller holders 23 , the track grooves 212 and the roller grooves 221 correspond to form a plurality of roller passages R1, and the circulation sleeve group 24 is correspondingly arranged in the circulation through hole 222 to A plurality of circulation channels R2 are formed, and the circulation channels R2 and the roller channels R1 are respectively arranged correspondingly. The roller channel R1 can constitute a channel for the roller 26 to move on the spline shaft 21 to limit the moving direction and position of the roller 26 . The circulation channel R2 can constitute a channel for the roller 26 to restrict its moving direction and position during the circulation.

In this embodiment, the number of circulation sleeve sets 24 corresponds to the number of circulation through holes 222 , which is also four. The shape of the circulation sleeve group 24 corresponds to the shape of the circulation through hole 222, and each circulation sleeve group 24 is closely connected with each corresponding circulation through hole 222, so that each circulation sleeve group 24 can be inserted into each circulation through hole 222. A plurality of circulation channels R2 are formed. Each circulation sleeve set 24 in this embodiment has two sleeves 241, 242 respectively. After the sleeves 241, 242 are combined, a circulation channel R2 can be formed in the middle part. However, it is not limited thereto. In different embodiments, the number of sleeves can be three, or four, .

In addition, each end cap 25 has a plurality of return channels R3 (as shown in FIG. 2B ). Since the present embodiment takes the spline shaft 21 having four roller grooves 221 and four circulation through holes 222 as an example, each end cover 25 preferably has four return channels R3 to correspond to the structure of each element. However, the utility model is not limited thereto.

The two end caps 25 are sleeved on the spline shaft 21, and are respectively arranged at both ends of the outer cylinder 22, so that the return channel R3 of the end cover 25 can correspond to the roller channel R1 and the circulation channel R2, and the two ends of the return channel R3 Connect the roller channel R1 and the circulation channel R2 respectively. Wherein, two ends of each circulating sleeve group 24 are respectively connected to the side faces of these end caps 25 facing the outer cylinder 22 . Specifically, the two ends of the circulating sleeve group 24 after the combination of the two sleeves 241 and 242 can respectively contact the side faces of the end caps 25 facing the outer cylinder 22, thereby making the circulation formed by the circulating sleeve group 24 The channel R2 can communicate with the return channel R3 on the end cover 25, so that the roller 26 can continuously roll in the circulation channel R2 and the return channel R3. In addition, the two ends of each return channel R3 are respectively connected with a corresponding roller channel R1 and a circulation channel R2 to jointly form a plurality of roller circulation paths RP, so that the rollers 26 can be accommodated in the roller circulation paths RP internal circulation movement.

Therefore, when the rollers 26 of each string move to the position of the end cover 25 in the roller channel R1, they will be guided to the corresponding circulation channel R2 along the corresponding return channel R3 of the end cover 25, resulting in repeated circular movement. Specifically, the roller 26 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 25, and then guide it to the corresponding circulation channel through the return channel R3 In R2; when the roller 26 moves from the circulation channel R2 to the end cover 25 at the other end, it can pass through the curved surface structure design of the return channel R3 of the other end cover 25, and then guide it back to the corresponding roller channel R1 , to form a circular motion.

Please refer to FIG. 4A and FIG. 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. Partially enlarged schematic diagram. In order to make the drawing simple and convenient for readers to understand the creation of this embodiment, FIG. 4A only shows the two strings of rollers 26 on the right side, and the two strings of rollers 26 on the left side are not shown for convenience of explanation.

In FIG. 4A and FIG. 4B , each track groove 212 has two bearing surfaces 213 , 214 respectively. The bearing surfaces 213 , 214 are contact surfaces where the roller 26 contacts the shaft body 211 when the roller channel R1 moves. In addition to the two bearing surfaces 213, 214, the track groove 212 of this embodiment further has a bottom surface 215 connecting the two bearing surfaces 213, 214, and the two roller holders 23 are respectively arranged on the two track grooves 212. Bottom 215.

In addition, each roller groove 221 has a setting surface 223 , and the setting surface 223 is arranged opposite to a bearing surface ( 213 or 214 ) of the track groove 212 . Each roller groove 221 further has a first side 224 connected to the installation surface 223 , and each roller retainer 23 has a second side 231 opposite to the first side 224 . Wherein, the second side 231 is adjacent to the bearing surface (213 or 214), and a bearing surface 213, a setting surface 223, a first side 224 and a second side 231 jointly form a roller channel R1, and the other bearing surface 214 , another setting surface 223 , another first side surface 224 and another second side surface 231 jointly form another roller channel R1 . Therefore, one roller holder 23, the spline shaft 21 and the outer cylinder 22 can form two roller passages R1, and the two roller holders 23 can form four roller passages R1 in total, for the rollers 26 to move on the shaft. Roll on the main body 211.

In addition, on the radial section of the spline shaft 21, these roller circulation paths RP located on the same side of the spline shaft 21 are intersecting (as shown in Fig. used to be a cross). Specifically, when the two series of rollers 26 move in the return flow channel R3 of the end cover 25, they are crossed in radial section. Even so, since the roller circulation path RP on the same side does not actually interfere in the return flow channel R3 of the end cover 25 spatially, the two strings of rollers 26 do not interfere with each other during return flow.

In addition, since the number of roller passages R1 and circulation passages R2 in this embodiment is four respectively, on the radial section of the spline shaft 21, the connection line between each roller passage R1 and each corresponding circulation passage R2 The extension of L (an imaginary straight line) can form a quadrilateral (diamond or square, referred to herein as O-shaped contact). The rollers 26 of the roller spline set 2 of this embodiment are in line contact on the track grooves 212 of the spline shaft 21 respectively, so compared with the ball spline set 1 of FIG. 1 (the known ball spline set For point contact), the roller spline set 2 can bear high radial load.

In addition, it is particularly noted that since the roller spline set 2 of this embodiment is an O-shaped contact, when the outer cylinder 22 is subjected to a torsional moment, for example, the outer cylinder 22 is subjected to a torque in the forward (or counterclockwise) direction (Torque), the structure of the roller spline set 2 of this embodiment can withstand relatively large torsional moment.

In order to make the manufacturing easier and faster, and further reduce the manufacturing cost of the roller spline set, another embodiment of the roller spline set is proposed below.

Please refer to FIG. 5 to FIG. 6E , wherein FIG. 5 is an exploded schematic view of a roller spline set 2a according to another embodiment of the present invention, and FIG. 6A is a circulation sleeve of another embodiment of the present invention. 6B and 6C are schematic diagrams of the circulation sleeve group and the end cap of another embodiment of the utility model respectively, and FIG. 6D is the two circulation sleeve groups and the corresponding rollers of another embodiment of the utility model. 6E is a schematic diagram of the combination of two circulation sleeve sets in another embodiment of the present invention.

The recirculating sleeve set 24 of the roller spline set 2 a in this embodiment also has two sleeves 241 , 242 , and the two sleeves 241 , 242 can form a recirculating channel R2 after being combined. However, the main difference with the roller spline set 2 is that, as shown in FIG. type. Wherein, the sleeve 241 has a straight portion 2411 and a protruding portion 2412, the sleeve 242 has a straight portion 2421 and a protruding portion 2422, the straight portion 2411 is connected to the protruding portion 2412, the straight portion 2421 is connected to the protruding portion 2422, and these straight portions 2411, 2421 are arranged in the circulation through hole 222 of the outer cylinder 22 . Here, the sleeves 241 and 242 are integrally formed as an example, of course, two components can also form a sleeve. In addition, as shown in FIGS. 6B to 6E , the end cap 25 of this embodiment has a recessed portion 251 corresponding to the assembled protrusions 2412 , 2422 , and these protrusions 2412 , 2422 can be inserted into the recesses of the end cap 25 The portion 251 is disposed in the recessed portion 251 to be combined with the end cap 25 .

In addition, the outer sides of these protruding parts 2412, 2422 of each circulating sleeve group 24 respectively have first arcuate surfaces 243, and the end cap 25 further has a second arcuate surface 252 concave inward, and the first arcuate surfaces 243 Together with the second arc surface 252 , a recirculation channel R3 (not shown) can be formed. Here, the shapes of the recessed portion 251 and the combined protruding portions 2412 , 2422 match each other, and the recessed portion 251 is a hole formed therethrough, and is located on the lower side of the second arc-shaped surface 252 . Therefore, when the circulating sleeve set 24 is combined with the end cover 25, the first arc-shaped surface 243 on the outside of these protruding parts 2412, 2422 of the circulating sleeve set 24 and the second arc-shaped surface 252 of the end cover 25 can be jointly formed. A return channel R3, so that the roller 26 can roll on the return channel R3.

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

To sum up, in the roller spline set of the present invention, the roller holder is correspondingly arranged in the track groove of the spline shaft, so that the roller holder, the bearing surface of the track groove and the rollers of the outer cylinder The groove can form a plurality of roller passages correspondingly. In addition, the circulation sleeve group is correspondingly arranged in the circulation through hole to form a plurality of circulation passages, and the two ends of the return passage of the end cover are respectively connected with the roller passage and the circulation passage, and The corresponding roller channel, circulation channel and return channel jointly form a structural design of multiple roller circulation paths, so that the rollers can circulate in the roller circulation path. Therefore, since the roller spline set of the present invention utilizes the rollers to move through the roller channel on the spline shaft, the roller spline set of the present invention can withstand relatively high radial loads.

The above description is for illustration only, not for 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 each rail groove is located at the surface of the shaft body and with two Individual loading end；

   Outer barrel, it is arranged and is slideably positioned in the splined shaft, the outer barrel has multiple roller slots and multiple circulation through holes, institute Roller slot is stated to be correspondingly arranged with the circulation through hole；

   Multiple roller keepers, are correspondingly arranged in the rail groove, the carrying of the roller keeper, the rail groove Face and the roller slot are correspondingly formed multiple roller passages；

   Multiple circulating sleeve groups, be correspondingly arranged in the circulation through hole to form multiple circulation canals, the circulation canal with 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 the end cap has multiple backflows Passage, the both ends of each return flow line connect each roller passage and each circulation canal respectively, and corresponding described Roller passage, the circulation canal and the return flow line are 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 roller slot has respectively to be set Face, the setting face are oppositely arranged with the loading end.
3. 3. roller spline group according to claim 2, it is characterised in that wherein each roller slot further has respectively The first side being connected with the setting face, each roller keeper have the be oppositely arranged with the first side respectively Two side faces, the second side is adjacent to the loading end, the loading end, the setting face, the first side and described the Two side faces are collectively forming a roller passage.
4. 4. roller spline group according to claim 1, it is characterised in that one of them described roller keeper and the flower Key axle and the outer barrel form two roller passages.
5. 5. roller spline group according to claim 1, it is characterised in that wherein, on the radial section of the splined shaft, The roller circulating path positioned at described splined shaft the same side is arranged in a crossed manner.
6. 6. roller spline group according to claim 1, it is characterised in that wherein described roller passage and the circulation canal Quantity be respectively 4, and on the radial section of the splined shaft, the roller passage and the corresponding circulation canal Connecting line extension form quadrangle.
7. 7. roller spline group according to claim 1, it is characterised in that wherein each circulating sleeve group has more respectively Individual sleeve, the sleeve form a circulation canal.
8. 8. roller spline group according to claim 7, it is characterised in that the both ends difference of wherein each circulating sleeve group Connect the side that the end cap faces the outer barrel.
9. 9. roller spline group according to claim 7, it is characterised in that each sleeve of wherein described circulating sleeve group There is vertical tube part and protuberance respectively, the vertical tube part is arranged at the circulation through hole, and the end cap has and the protrusion The depressed part that portion is correspondingly arranged, the protuberance are arranged at the depressed part.
10. 10. roller spline group according to claim 9, it is characterised in that the protrusion of wherein described circulating sleeve group The outside in portion has the first arcwall face, and the end cap further has the second arcwall face, first arcwall face and described second Arcwall face collectively constitutes a return flow line.