TWI696769B - Ball spline with oil injection structure - Google Patents

Abstract

A ball spline with an oil injection structure includes a spline shaft, a spline sleeve and a linear bearing unit. The spline shaft has a plurality of pairs of first ball grooves, the spline sleeve is slidably sleeved on the spline shaft, and has a plurality of pairs of second ball grooves opposite to the first ball grooves, and a concave An outer ring groove of an inner ring surface, and an oil injection hole communicating from the outer ring surface to an outer ring groove, the linear bearing unit is installed between the spline shaft and the spline sleeve, and has a retainer and For most ball sets, the retainer has a plurality of circulation channels, each circulation channel and each pair of second ball grooves form a circulation path, and the retainer also has an inner ring groove and a plurality of grooves connected to the corresponding circulation path , The outer ring groove and the inner ring groove together form a lubrication groove chamber. The arrangement of the outer ring groove and the inner ring groove can directly provide lubricating grease to the circulation path, and can prolong the service life of the ball spline.

Description

Ball spline with oil injection structure

The invention relates to a linear transmission device, in particular to a ball spline with an oil injection structure.

: There is a ball spline with a lubricated structure (the applicant's patent certificate of the Republic of China I499728 approved by the applicant), which includes a long shaft, a moving body, a retainer and a plurality of rolling elements. The outer surface of the long axis is provided with a plurality of rolling grooves arranged along the axis direction, the moving body is provided with a perforation through which the long axis passes, and the inner edge surface of the perforation is provided with a rolling groove opposite to the rolling groove, the rolling groove A load path is formed with the rolling groove. The outer edge of the moving body is provided with a plurality of oil holes communicating with the perforation. The retainer is provided between the long axis and the moving body. The retainer is provided with a plurality of circulation channels. , The circulation path and the load path constitute a circulation path, and an axial oil passage arranged along the axial direction is provided between the two circulation passages, and a transverse oil passage connected with the circulation passages and the axial flow passages, the The axial oil passage and the transverse oil passage and the inner edge surface of the perforation form a lubricating oil flow passage, the lubricating oil flow passage communicates with the oil hole, and the rolling elements are provided on the circulation path.

Although the oil hole, the axial oil passage and the transverse oil passage can be used to fill the oil from the outside and achieve the lubrication effect of the ball spline, it must be located in the The oil holes at different angles of the moving body are filled with oil, which is troublesome and time-consuming in operation, and has poor lubrication efficiency.

There is another type of rolling bearing (JPA2013167337 patent case), which is mainly provided with a round cage inside a bush, and each pillar of the cage is provided with an extension extending along the axial direction of the cage and can be connected to the two ends of the cage Oil channel groove. However, this bushing has no oil hole design, and it is not easy to add grease. :

Therefore, the object of the present invention is to provide a ball spline with an oil injection structure that can facilitate oil injection and has a good lubrication effect.

Therefore, the ball spline with oil injection structure of the present invention includes a spline shaft, a spline sleeve and a linear bearing unit. The spline shaft extends along an axis, and has an outer peripheral surface, and a pair of first ball grooves concavely formed by the outer peripheral surface and parallel to the axis, and the spline sleeve is slidably sleeved on the spline along the axis The key shaft has an inner annular surface opposite to the outer peripheral surface, an outer annular surface opposite to the inner annular surface, a pair of second recesses disposed on the inner annular surface and opposite to the first ball grooves A ball groove, an outer ring groove recessed in the inner ring surface, and an oil injection hole communicating from the outer ring surface to the outer ring groove, the linear bearing unit is installed between the spline shaft and the spline sleeve , Has a retainer, and a plurality of ball sets installed in the retainer, the retainer has a plurality of circulation channels arranged at intervals around the axis, the circulation channels, the first ball grooves and the second balls The groove constitutes a plurality of circulation paths, the retainer also has an inner ring groove relative to the outer ring groove, and a plurality of A groove connected to the inner ring groove and the circulation channels, the outer ring groove and the inner ring groove together form a lubricating groove chamber, and each ball group has a plurality of balls rotatably installed in the circulation paths .

The effect of the present invention is that the outer ring groove and the inner ring groove jointly form the lubrication groove chamber, the grooves communicate with the inner ring groove and the circulation paths, and the oil injection hole communicates from the outer ring surface to The action of the outer ring groove and the like makes the operation of replenishing lubricating grease quite easy, and the lubricating grease can directly provide these ball sets to produce a better lubrication effect.

10: Spline shaft

L: axis

11: outer peripheral surface

12: The first ball groove

20: Splined sleeve

21: first end face

22: Second end face

23: inner torus

24: outer torus

25: Second ball groove

26: Buckle

27: buckle

28: outer ring groove

29: Embedded groove

201: Oil injection hole

202: oil guide hole

203: third ball groove

30: Linear bearing unit

31: retainer

311: first side

312: Second side

313: outer wall surface

314: inner wall surface

315: Loop Road

315’: Non-load straight line

315”: straight line load

316: Groove

317: convex seat

318: inner ring groove

319: Groove

33: reflux section

34: Lubrication tank

32: Ball set

321: Ball

40: bearing ring

41: inner side

42: Outer side

43: Grease hole

44: fourth ball groove

50: hoop bearing unit

d: center distance

w1: first width

w2: second width

w3: hoop width

Other features and functions of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a perspective combined view of an embodiment of the ball spline with oil injection structure of the present invention; FIG. 2 is the implementation 3 is a perspective exploded view of the embodiment; FIG. 4 is an incomplete exploded schematic view of the embodiment; FIG. 5 is an incomplete cross-sectional schematic view of the embodiment; and FIG. 6 is a partially enlarged schematic diagram of FIG. 5.

Referring to FIGS. 1 to 4, an embodiment of a ball spline having an oil injection structure of the present invention includes a spline shaft 10, a spline sleeve 20, a linear bearing unit 30, and a shaft Bearing ring 40 and a ring bearing unit 50.

The spline shaft 10 extends along an axis L, and has an outer peripheral surface 11 and a pair of first ball grooves 12 recessed by the outer peripheral surface 11 and parallel to the axis L.

The spline sleeve 20 has a hollow cylindrical shape and is slidably sleeved on the spline shaft 10 along the axis L, and has a first end face 21 and a second end opposite the first end face 21 along the axis L An end surface 22, an inner annular surface 23 opposite to the outer peripheral surface 11 and intersectingly connected between the first end surface 21 and the second end surface 22, an outer annular surface 24 opposite to the inner annular surface 23, a pair of concaves The second ball grooves 25 and two provided on the inner ring surface 23 and opposite to the first ball grooves 12 respectively approach the buckling grooves 26 and two of the first end surface 21 and the second end surface 22 respectively The buckles 27 in the buckle grooves 26, an outer ring groove 28 approaching the first end surface 21 and located inside one of the buckle grooves 26, are mostly arranged at equal intervals around the axis L and are formed by the inner ring surface 23 A concave insertion groove 29, an oil injection hole 201 communicating from the outer ring surface 24 to the outer ring groove 28, a plurality of oil guide holes 202 communicating from the outer ring surface 24 to the inner ring surface 23, and two concave devices A third ball groove 203 on the outer ring surface 24 and around the axis L. A center distance d is formed between the first end surface 21 of the spline sleeve 20 and the oil injection hole 201.

The linear bearing unit 30 is installed between the outer circumferential surface 11 of the spline shaft 10 and the inner annular surface 23 of the spline sleeve 20, so that the spline sleeve 20 can linearly slide relative to the spline shaft 10, the linear The bearing unit 30 has a retainer 31 and a plurality of ball sets 32 installed in the retainer 31.

The retainer 31 has a first side portion 311 that approaches the first end surface 21 and is blocked by one of the buckles 26, and is opposite to the first side portion 311 along the axis L and is supported by another buckle 26. A second side portion 312 that blocks the limit, an outer wall surface 313 opposite to the inner annular surface 23 and extending from the first side portion 311 to the second side portion 312, an opposite to the outer wall surface 313 and relative to Most of the inner wall surface 314 of the outer peripheral surface 11 is mostly recessed by the outer wall surface 313 and has a long circular groove shape corresponding to the axis L. Most of the inner wall surface 314 communicates with the corresponding circulation channel 315 and corresponds to The axis L extends through a straight groove 316, most of the protrusions 317 are arranged at equal intervals around the axis L and protruded by the outer wall surface 313, an inner ring groove 318 relative to the outer ring groove 28, and a plurality of A groove 319 connected to the inner ring groove 318, each circulation channel 315 and each pair of second ball grooves 25 form a circulation path, and each circulation channel 315 has a non-loaded straight section 315 disposed on the convex seat 317 ', a load straight section 315" with a slot 316", and two return sections 33 connected between the non-load straight section 315 and the load straight section 315', the oil injection hole 201 of the spline sleeve 20 is disposed at a position between Between two adjacent non-load path straight sections 315' of the circulation channels 315, each groove 319 is connected to one of the corresponding return sections 33, the protrusions 317 are nested in the insertion grooves 29 The outer ring groove 28 and the inner ring groove 318 together form a lubrication groove chamber 34. Each ball group 32 has a plurality of balls 321 rotatably installed in the circulation channels 315, and the ball groups 32 pass through The through grooves 316 are respectively nested in the corresponding first ball grooves 12 and the second ball grooves 25.

As shown in FIGS. 4 and 6, a first width w1 of the outer ring groove 28 of the spline sleeve 20 parallel to the axis L is not greater than a first width w1 of the inner ring groove 318 of the retainer 31 that is parallel to the axis L Two width w2. The circumferential width w3 of each groove 319 of the retainer 31 around the axis L is not greater than one third of the ball diameter of each ball 321. The second width w2 of the inner ring groove 318 of the retainer 31 is not less than one-half of the circumferential width w3 of each groove 319. A central distance d between the first end surface 21 of the spline sleeve 20 and the oil injection hole 201 is not less than twice the first width w1 of the outer ring groove 28.

The bearing ring 40 is rotatably sleeved on the outside of the spline sleeve 20 about the axis L, and has an inner side surface 41 opposite to the outer ring surface 24, an outer side surface 42 opposite to the inner side surface 41, a The outer side surface 42 communicates with the lubricating hole 43 of the inner side surface 41, and two fourth ball grooves 44 recessed on the inner side surface 41 and surrounding the axis L, the fourth ball groove 44 and the third balls respectively The slots 203 are opposite.

The ring bearing unit 50 is installed between the outer ring surface 24 of the spline sleeve 20 and the inner side surface 41 of the bearing ring 40, so that the bearing ring 40 can smoothly rotate relative to the spline sleeve 20. The bearing unit 50 is installed between the third ball grooves 203 and the fourth ball grooves 44.

In order to further understand the effects produced by the cooperation of the components of the present invention, the use of technical means, and the expected effects, the following will be described, I believe that this can have a more in-depth and specific understanding of the present invention.

As shown in Figure 2, Figure 5 and Figure 6, using the whole of the above components Structure, when the operator injects grease from the oil injection hole 201, the grease will flow along the lubrication groove chamber 34 formed by the outer ring groove 28 and the inner ring groove 318, the grooves 319, and finally flow The return section 33 to the circulation channels 315 can also provide the lubricating effect of the ball sets 32 during the circulation operation.

In addition, the operator can also inject lubricating grease from the lubricating hole 43 of the bearing ring 40 to lubricate the ring bearing unit 50 and can be led to the circulation channels 315 through the guide of the oil guiding hole 202.

Therefore, the present invention uses the outer ring groove 28 and the inner ring groove 318 to form a lubricating groove chamber 34 that can store lubricating grease. The lubricating groove chamber 34 reuses the guidance of the grooves 319 so that the lubricating grease can be drained to In the circulation channels 315, the lubricating effect of the ball groups 32 during the circulation operation is made.

And the first width w1 of the outer ring groove 28 of the spline sleeve 20 parallel to the axis L is not greater than the second width w2 of the inner ring groove 318 of the retainer 31 parallel to the axis L. The lubricating groove chamber 34 formed by the groove 28 and the inner ring groove 318 produces better grease storage effect. Furthermore, the function of the circumferential width w3 of each groove 319 of the retainer 31 is not greater than one third of the ball diameter of each ball 321, so that the balls 321 can be prevented from being caught in the grooves 319. Also using the effect that the distance d between the first end surface 21 of the spline sleeve 20 and the center of the oil injection hole 201 is not less than twice the first width w1 of the outer ring groove 28, the outer ring groove 28 and the first Between the end surfaces 21, there is sufficient meat thickness and sufficient structural strength. Reuse the second of the inner ring groove 318 The effect that the width w2 is not less than one-half of the circumferential width w3 of each groove 319 can produce the technical effect of uniformly lubricating each recirculation section 33.

The present invention can not only achieve the intended linear transmission purpose, but also produce the following effects:

1. The present invention can use a single oil injection hole 201, and can achieve the effect of lubricating the interior of the spline sleeve 20 without changing the appearance of the spline sleeve 20, which is quite in line with economic and practical principles.

2. By the design of the lubricating grease oil path formed by the outer ring groove 28, the inner ring groove 318, and the grooves 319, the lubricating grease can effectively lubricate the ball group 32 filled in the circulation channels 315, and can be extended The service life of the product.

3. The original design of the ball spline can be maintained to complete the installation, and the oil can be directly supplied from the outside of the spline sleeve 20, which is convenient for customer maintenance and maintenance.

In summary, the ball spline of the present invention with an oil injection structure has a simple overall structure, and can achieve a better lubrication effect, which can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

L: axis

20: Splined sleeve

21: first end face

22: Second end face

23: inner torus

24: outer torus

25: Second ball groove

31: retainer

311: first side

312: Second side

313: outer wall surface

314: inner wall surface

315: Loop Road

315’: Non-load straight line

26: Buckle

27: buckle

28: outer ring groove

29: Embedded groove

201: Oil injection hole

202: oil guide hole

203: third ball groove

30: Linear bearing unit

315”: straight line load

316: Groove

317: convex seat

318: inner ring groove

319: Groove

33: reflux section

34: Lubrication tank

32: Ball set

321: Ball

d: center distance

w3: hoop width

Claims (8)

A ball spline with oil injection structure, including: A spline shaft, extending along an axis, and having an outer peripheral surface, and a pair of first ball grooves recessed from the outer peripheral surface and parallel to the axis; A splined sleeve is slidably sleeved on the spline shaft along the axis, and has an inner ring surface opposite to the outer peripheral surface, an outer ring surface opposite to the inner ring surface, and a pair of concave sets The inner ring surface and the second ball groove opposite to the first ball grooves, an outer ring groove recessed in the inner ring surface, and an oil injection hole communicating from the outer ring surface to the outer ring groove; and A linear bearing unit, installed between the spline shaft and the spline sleeve, has a retainer, and a plurality of ball sets installed in the retainer, the retainer has a plurality of circulation channels arranged at intervals around the axis , The circulation channels, the first ball grooves and the second ball grooves form a plurality of circulation paths, the retainer further has an inner ring groove relative to the outer ring groove, and a plurality of the inner ring grooves are connected to the inner ring groove and The grooves of the circulation channels, the outer ring groove and the inner ring groove together form a lubricating groove chamber, and each ball group has a plurality of balls rotatably installed in the circulation paths. The ball spline with an oil injection structure according to claim 1, wherein each circulating prop of the linear bearing unit has a non-load straight section, a load straight section provided with the through groove, and two connected to the non-load straight line The return section between the segment and the load straight section, the retainer also has and most of the through-slots connected to the corresponding load straight section and extending in a straight groove corresponding to the axis, the oil injection hole of the spline sleeve is located between Between two straight lines of the non-load path of the adjacently arranged circulation channels. The ball spline with an oil injection structure according to claim 2, wherein each groove of the linear bearing unit communicates with one of the corresponding return sections. The ball spline with an oil injection structure according to claim 1, wherein a first width of the outer ring groove of the spline sleeve parallel to the axis is not greater than a first width of the inner ring groove of the retainer parallel to the axis Two width. The ball spline with an oil injection structure according to claim 4, wherein the circumferential width of each groove of the retainer around the axis is not more than one third of the ball diameter of each ball. The ball spline with an oil injection structure according to claim 5, wherein the second width of the inner ring groove of the retainer is not less than half of the circumferential width of each groove of the retainer around the axis . The ball spline with an oil injection structure according to claim 1, wherein the distance between the first end surface of the spline sleeve and the center of the oil injection hole is not less than twice a first width of the outer ring groove parallel to the axis . The ball spline with an oil injection structure according to claim 1, wherein the spline sleeve further has a plurality of oil guide holes communicating from the outer ring surface to the inner ring surface, and at least one recess is provided on the outer ring surface And the third ball groove around the axis, the ball spline further includes a bearing ring rotatably sleeved on the outside of the spline sleeve, and a sleeve between the bearing ring and the spline sleeve The ring bearing unit of the bearing ring has an inner side surface opposite to the outer ring surface, an outer side surface opposite to the inner side surface, an oiling hole communicating from the outer side surface to the inner side surface, and at least one concave A fourth ball groove provided on the inner side and surrounding the axis, the hoop bearing unit is installed between the fourth ball groove and the third ball groove.

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