CN214661523U

CN214661523U - Ball spline and backflow structure thereof

Info

Publication number: CN214661523U
Application number: CN202120044157.XU
Authority: CN
Inventors: 纪颖旻; 林群善
Original assignee: Precision Motion Industries Inc
Current assignee: Precision Motion Industries Inc
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-11-09
Anticipated expiration: 2031-01-08

Abstract

The utility model relates to a ball spline and a reflux structure thereof, wherein the spline shaft is provided with a shaft lever and a track groove, and the track groove axially extends on the outer edge surface of the shaft lever; the outer barrel is slidably sleeved on the shaft rod, an outer rolling groove and an inner rolling through hole are formed in the inner edge surface of the outer barrel, the outer rolling groove and the track groove form a guide-in channel, and grooves are formed in the end surface of the outer barrel through the outer rolling groove; the backflow component is provided with an outer backflow groove and an inner backflow through hole, the outer backflow groove is arranged corresponding to the outer rolling groove and is formed with convex ribs, the convex ribs are abutted against the concave grooves to enable the leading-in channel to extend to the backflow component, and the inner backflow through hole and the inner rolling through hole form a leading-out channel, so that rolling stability of the ball is kept.

Description

Ball spline and backflow structure thereof

Technical Field

The present invention relates to linear transmissions, and more particularly to a linear ball guide structure.

Background

Ball splines (Ball splines) are linear guide devices in which an outer cylinder linearly moves on a Spline shaft, and are suitable for mechanisms that linearly move while transmitting torque, since balls roll on Spline grooves. The ball spline is mainly composed of an outer cylinder, a spline shaft, balls, and a return assembly, and the outer cylinder can linearly move along the spline shaft with high precision by the infinite circulation rolling of the balls between the outer cylinder and the spline shaft.

In addition, when assembling the ball spline, the assembling process is to assemble the end cap at one end of the spline to the outer cylinder, then to fill the balls into the ball circulation channel, and then to cover the other end with a cover plate to prevent the filled balls from falling out. After the other end cover is assembled to the other end, the cover plate is pulled away to complete the assembly. However, the installation of the ball spline is difficult and complicated, and the yield is low; in addition, because the ball spline bears a high radial load for a long time, and the impulsive force of the ball during the orbit easily causes vibration, the backflow component is easy to displace to generate a gap, the ball causes friction resistance during the rolling circulation, and the smoothness of the ball during the rolling is further influenced. Therefore, how to improve the above disadvantages is the motivation of the present inventors.

In view of the above, the present inventors have made extensive studies and studies to solve the above problems in combination with the application of the above prior art, and as a result, the present inventors have improved the present invention.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a ball spline and backflow structure thereof is provided, its backward flow subassembly combines when the urceolus, and grooved fin of outer backward flow can butt the groove of urceolus and provide and dock firmly to keep the rolling steadiness of ball.

In order to achieve the above object, the present invention provides a ball spline, which comprises a spline shaft having a shaft and a track groove formed on the shaft, wherein the track groove is formed on the outer peripheral surface of the shaft along the axial extension of the shaft; the outer barrel is slidably sleeved on the shaft rod, an outer rolling groove and an inner rolling through hole which extend along the axial direction of the outer barrel are formed in the inner edge surface of the outer barrel, the outer rolling groove is arranged corresponding to the track groove and forms a guide-in channel capable of containing a plurality of balls together, and grooves are formed in the outer rolling groove on two end surfaces of the outer barrel respectively; and a pair of backflow components correspondingly combined on two opposite end surfaces of the outer barrel, each backflow component is provided with an outer backflow notch and an inner backflow through hole, the outer backflow notch is arranged corresponding to the outer rolling notch, a convex rib is formed on one side surface facing the outer barrel, the convex rib is abutted against the concave groove to enable the leading-in channel to extend to the backflow component, and the inner backflow through hole is arranged corresponding to the inner rolling through hole and jointly forms a leading-out channel capable of containing the balls.

The ball spline further comprises a pair of dust caps, and the pair of dust caps are correspondingly combined on two outer sides of the pair of backflow components.

The ball spline may further comprise a plurality of track grooves, and the plurality of track grooves are equidistantly disposed on the outer peripheral surface of the shaft.

In the ball spline, each of the reflow components includes a reflow sheet and a reflow block, the reflow sheet is provided with the outer reflow slot and the inner reflow through hole, the reflow block is provided with a reflow slot, and the reflow block is fixed on one side of the reflow sheet far away from the outer barrel and enables the reflow slot to correspondingly seal one outer side of the outer reflow slot and the inner reflow through hole.

In the above ball spline, a detent block is formed on one side of the backflow sheet facing the backflow block, a detent groove is correspondingly formed on the backflow block, and the backflow sheet and the backflow block are combined by mutual positioning of the detent block and the detent groove.

In the above ball spline, a positioning concave part is formed on each of two sides of the detent block, a positioning convex part is formed on each of two sides of the detent groove, and the detent block and the detent groove are positioned by being mutually clamped between the positioning concave part and the positioning convex part.

A backflow structure of a ball spline is used for being combined with a spline shaft with a track groove, and comprises an outer barrel, a plurality of ball grooves and a plurality of grooves, wherein the outer barrel is slidably sleeved on the spline shaft, an outer rolling groove and an inner rolling through hole which extend along the axial direction are arranged on the inner edge surface of the outer barrel, the outer rolling groove is arranged corresponding to the track groove and forms a leading-in channel which can contain a plurality of balls together, and grooves are respectively formed on two end surfaces of the outer barrel; a backflow sheet, which is provided with an outer backflow slot and an inner backflow through hole, wherein the outer backflow slot is arranged corresponding to the outer rolling slot, a convex rib is formed on one side surface facing the outer barrel, the convex rib is abutted against the concave groove to enable the leading-in channel to extend to the backflow component, and the inner backflow through hole is arranged corresponding to the inner rolling through hole and forms a leading-out channel capable of containing a plurality of balls together; and the backflow block is provided with a backflow groove, the backflow block is fixed on one side of the backflow sheet, which is far away from the outer cylinder, and the backflow groove correspondingly seals one outer side of the outer backflow open groove and the inner backflow through hole.

In the above-mentioned backflow structure of the ball spline, a detent block is formed on one side of the backflow sheet facing the backflow block, a detent groove is correspondingly formed on the backflow block, and the backflow sheet and the backflow block are combined by mutual positioning of the detent block and the detent groove.

In the above-mentioned backflow structure of the ball spline, a positioning concave portion is formed on each of two sides of the engaging block, a positioning convex portion is formed on each of two sides of the engaging groove, and the engaging block and the engaging groove are positioned by being engaged with each other between the positioning concave portion and the positioning convex portion.

The utility model has the beneficial effects that: compared with the prior art, when the backflow component of the ball spline is attached to the outer barrel, the outer backflow notch of the backflow component is correspondingly connected with the outer rolling notch of the outer barrel, and the outer rolling notch and the track groove of the spline shaft form a leading-in channel; the outer rolling groove of the outer cylinder is formed with a groove, and the outer reflux groove is formed with a convex rib, so that when the reflux assembly is combined with the outer cylinder, the convex rib of the outer reflux groove can be abutted against the groove of the outer cylinder to provide stable butt joint, and the reflux assembly is prevented from being vibrated by impulsive force generated when the ball advances in the guide-in channel, so that the reflux assembly is prevented from displacing or generating a gap; therefore, the backflow structure of the ball spline can provide a smooth linear channel, so that resistance to the ball is avoided, and the smoothness of the ball during rolling is improved; furthermore, the utility model discloses a backflow structure's setting is simple, so can simplify the installation procedure of ball spline and promote the production yield, more increase the utility model discloses a practicality.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.

Drawings

Fig. 1 is a schematic perspective view of the ball spline and the backflow structure thereof according to the present invention.

Fig. 2 is a combined cross-sectional view of the ball spline and the backflow structure thereof according to the present invention.

Fig. 3 is a three-dimensional exploded view of the backflow structure of the ball spline of the present invention.

Fig. 4 is a schematic combination diagram of the backflow structure of the ball spline according to the present invention.

Fig. 5 is a schematic perspective view of a backflow structure of the ball spline according to the present invention.

Fig. 6 is a schematic combination diagram of the backflow structure of the ball spline according to the present invention.

Fig. 7 is a cross-sectional view taken along line 7-7 of fig. 5.

Fig. 8 is a cross-sectional view taken along line 8-8 of fig. 4.

Wherein, the reference numbers:

1: ball spline

2: rolling ball

10 spline shaft

11: shaft lever

110 outer edge surface

12 track groove

20: outer cylinder

200 inner edge surface

21, external rolling slotting

211, concave groove

22 inner rolling through hole

23 introduction channel

24: lead-out channel

30 reflux assembly

300 circulation path

301 external reflux slotting

302 inner reflux through hole

303: convex rib

31 reflux tablet

311 clamping block

3110 positioning concave part

32: reflux block

320 reflux groove

321 clamping groove

3210: positioning convex part

40, dust cover

Detailed Description

The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings, which are provided for reference and illustration purposes only and are not intended to limit the present invention.

Please refer to fig. 1 and fig. 2, which are a schematic perspective view and a combined cross-sectional view of a ball spline and a backflow structure thereof according to the present invention. The ball spline 1 of the present invention includes a spline shaft 10, an outer cylinder 20, and a pair of return assemblies 30. The outer cylinder 20 is slidably coupled to the spline shaft 10, and the pair of reflow elements 30 are relatively coupled to both sides of the outer cylinder 20 to form the ball spline 1. The ball spline 1 will be described in detail later.

In an embodiment of the present invention, the ball spline 1 further includes a pair of dust caps 40. The pair of dust covers 40 are correspondingly combined on two outer sides of the pair of reflow components 30, so as to provide protection effects such as dust prevention for the pair of reflow components 30.

The spline shaft 10 has a shaft 11 and a track groove 12 provided on the shaft 11, and the track groove 12 extends along the axial direction of the shaft 11 at the outer peripheral surface 110 of the shaft 11. The outer cylinder 20 is combined on the shaft rod 11; preferably, the cross section of the track groove 12 is arc-shaped, and the number of the track grooves 12 is plural; the plurality of track grooves 12 are equidistantly provided on the outer peripheral surface 110 of the stem 11.

Fig. 3 to 5 are schematic diagrams showing a three-dimensional exploded view, a schematic diagram showing a combination and a schematic diagram showing an appearance of the backflow structure of the ball spline according to the present invention. As shown in fig. 3, the inner peripheral surface 200 of the outer cylinder 20 is provided with an outer rolling groove 21 and an inner rolling through-hole 22 extending in the axial direction. The outer rolling groove 21 is formed with a groove 211 at each of both end surfaces of the outer cylinder 20.

The pair of reflow elements 30 are correspondingly coupled to opposite end surfaces of the outer cylinder 20. Each reflow element 30 is provided with an outer reflow channel 301 and an inner reflow via 302. The external backflow groove 301 is disposed corresponding to the external rolling groove 21 and has a rib 303 formed on a side surface facing the external cylinder 20. In addition, the pair of backflow components 30 are firmly abutted by the protruding ribs 303 abutting against the grooves 211 of the outer cylinder 20, so as to avoid the impact force of the balls advancing in the guiding channel from causing vibration and further causing displacement or clearance of the backflow components 30, thereby reducing resistance to the balls and maintaining smoothness of rolling.

Specifically, each reflow element 30 includes a reflow sheet 31 and a reflow block 32. The reflow sheet 31 is provided with the outer reflow grooves 301 and the inner reflow through holes 302. The reflow block 32 is provided with a reflow groove 320. The reflow block 32 is fixed on the side of the reflow sheet 31 away from the outer cylinder 20.

It should be noted that the return sheet 31 is formed with a locking block 311 on a side facing the return block 32; furthermore, a locking groove 321 is correspondingly formed on the backflow block 32, so that the backflow sheet 31 and the backflow block 32 are combined by the mutual positioning of the locking block 311 and the locking groove 321. In this embodiment, the locking block 311 is substantially a fan-shaped piece, and the shape of the locking groove 321 is concave toward the backflow block 32 corresponding to the locking block 311.

It should be noted that, in this embodiment, a positioning concave portion 3110 is respectively formed on two sides of the locking block 311; furthermore, a positioning protrusion 3210 is formed on each side of the engaging groove 321, and the engaging block 311 and the engaging groove 321 are positioned by engaging the positioning recess 3110 and the positioning protrusion 3210 with each other.

Please refer to fig. 6 to 8, which are schematic cross-sectional views of the backflow structure of the ball spline according to the present invention. As shown in fig. 6, the pair of backflow components 30 are correspondingly combined on two opposite end surfaces of the outer cylinder 20, and the outer backflow grooves 301 are disposed corresponding to the outer rolling grooves 21 (see fig. 2) and together form a guiding channel 23 capable of accommodating a plurality of balls 2. In addition, the inner return through hole 302 is disposed corresponding to the inner rolling through hole 22 (see fig. 4) and forms a guiding channel 24 for accommodating a plurality of balls 2.

Referring to fig. 7, in the present embodiment, when the reflow sheet 31 of each reflow module 30 is attached to the end surface of the outer barrel 20, the outer reflow groove 301 is correspondingly engaged with the outer rolling groove 21, and the convex rib 303 of the outer reflow groove 301 is abutted to the concave groove 211 of the outer rolling groove 21, so that the guiding channel 23 extends to the outer reflow groove 301 of the reflow module 30.

Referring to fig. 8, when the reflow block 32 is fixed on the reflow sheet 31, the reflow groove 320 of the reflow block 32 correspondingly seals an outer side of the outer reflow groove 301 and the inner reflow through hole 302 to form a sealed reflow groove 320. Accordingly, both sides of the backflow groove 320 are respectively communicated with the introduction channel 23 and the discharge channel 24 to form a circulation path 300 for moving the plurality of balls 2.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims

1. A ball spline, comprising:

the spline shaft is provided with a shaft rod and a track groove arranged on the shaft rod, and the track groove is arranged on the outer edge surface of the shaft rod along the axial extension of the shaft rod;

the outer barrel is slidably sleeved on the shaft rod, an outer rolling groove and an inner rolling through hole which extend along the axial direction of the outer barrel are formed in the inner edge surface of the outer barrel, the outer rolling groove is arranged corresponding to the track groove and forms a guide-in channel capable of containing a plurality of balls together, and grooves are formed in the outer rolling groove on two end surfaces of the outer barrel respectively; and

the backflow assemblies are correspondingly combined on two opposite end faces of the outer barrel, each backflow assembly is provided with an outer backflow groove and an inner backflow through hole, the outer backflow grooves are arranged corresponding to the outer rolling grooves, a convex rib is formed on one side face facing the outer barrel and abutted against the grooves to enable the guide-in channel to extend to the backflow assemblies, and the inner backflow through holes are arranged corresponding to the inner rolling through holes and jointly form a guide-out channel capable of containing the balls.

2. The ball spline of claim 1, further comprising a pair of dust caps coupled to both outer sides of the pair of backflow assemblies, respectively.

3. The ball spline of claim 1, wherein the number of the track grooves is plural, and the plurality of track grooves are equidistantly provided at the outer peripheral surface of the shaft.

4. The ball spline of claim 1, wherein each of the reflow elements comprises a reflow plate and a reflow block, the reflow plate is provided with the outer reflow slot and the inner reflow through hole, the reflow block is provided with a reflow slot, and the reflow block is fixed on a side of the reflow plate away from the outer barrel such that the reflow slot correspondingly seals an outer side of the outer reflow slot and the inner reflow through hole.

5. The ball spline of claim 4, wherein the return piece has a detent formed on a side facing the return block, the return piece has a detent groove formed thereon, and the return piece are coupled by the detent and the detent groove being positioned with respect to each other.

6. The ball spline of claim 5, wherein a positioning concave portion is formed on each side of the engaging block, a positioning convex portion is formed on each side of the engaging groove, and the engaging block and the engaging groove are positioned by being engaged with each other by the positioning concave portion and the positioning convex portion.

7. A backflow structure of a ball spline for being coupled to a spline shaft having a track groove, comprising:

the outer cylinder is slidably sleeved on the spline shaft, an outer rolling groove and an inner rolling through hole which extend along the axial direction are formed in the inner edge surface of the outer cylinder, the outer rolling groove is arranged corresponding to the track groove and forms a guide-in channel capable of containing a plurality of balls together, and grooves are formed in the outer rolling groove on two end surfaces of the outer cylinder respectively;

a backflow sheet, which is provided with an outer backflow slot and an inner backflow through hole, wherein the outer backflow slot is arranged corresponding to the outer rolling slot, a convex rib is formed on one side surface facing the outer barrel, the convex rib is abutted against the concave groove to enable the leading-in channel to extend to the backflow component, and the inner backflow through hole is arranged corresponding to the inner rolling through hole and forms a leading-out channel capable of containing a plurality of balls together; and

and the backflow block is provided with a backflow groove, the backflow block is fixed on one side of the backflow sheet, which is far away from the outer cylinder, and the backflow groove correspondingly seals one outer side of the outer backflow open groove and the inner backflow through hole.

8. The backflow structure of claim 7, wherein the backflow tab has a detent formed on a side thereof facing the backflow tab, the backflow tab has a detent groove formed thereon, and the backflow tab are coupled to each other by the mutual positioning of the detent tab and the detent groove.

9. The backflow structure of a ball spline according to claim 7, wherein a positioning concave portion is formed on each of both sides of the detent block, a positioning convex portion is formed on each of both sides of the detent groove, and the detent block and the detent groove are positioned by being engaged with each other between the positioning concave portion and the positioning convex portion.