TWI606192B - Oil-injectable spline device - Google Patents

Description

Oil-fillable spline device

The present invention relates to a transmission device for a processing machine, and more particularly to an oil-fillable spline device.

A spline device (such as US Pat. No. 5,809,838), comprising a lead screw, a set of nut members disposed outside the lead screw, and a first ball unit disposed between the lead screw and the nut member a bearing outer ring disposed outside the nut member and a pair of second ball units disposed between the nut member and the outer ring of the bearing. The bearing outer ring has a radially disposed oil hole, the nut member has an inner annular surface, an outer annular surface opposite to the inner annular surface, an oil reservoir recessed by the outer annular surface, and a plurality of The oil guides are disposed at equal angles along the circumferential direction and penetrate the outer annular surface to the inner annular surface. When the oil is filled by the oil filling hole, the grease needs to be filled into the oil storage tank, and then the oil guiding channel is drained between the lead screw and the nut member, which is likely to cause excessive oiling and poor lubrication efficiency. Therefore, such a spline device does not produce a better lubricating effect for the first ball unit and the second ball unit.

Another spline device (such as the Republic of China Patent Publication No. TWI444542) includes a lead screw, a set of nut members disposed outside the lead screw, a first ball unit disposed between the lead screw and the nut member, a set of bearing outer rings disposed outside the nut member, and a pair disposed between the nut member and the outer ring of the bearing The second ball unit. The nut member has two spaced protrusions, an annular oil passage between the spaced apart convex portions, and an oil hole extending radially from the annular oil passage to an inner circumferential surface, the bearing outer ring having a Connect to the oil hole of the ring oil passage. Although the lubricating grease can be prevented from being excessively lubricated to the second ball unit by the arrangement of the spacers, the second ball unit is insufficiently lubricated due to the blocking of the spacers.

Accordingly, it is an object of the present invention to provide an oil-fillable spline device that can be oiled for internal and external locations and that produces a better lubricating effect.

Thus, the oil-fillable spline device of the present invention comprises a spline shaft, a nut member, a linear bearing unit, a bearing ring, an oil passage fitting and a circumferential bearing unit. The spline shaft extends along an axis and has an outer peripheral surface, and a plurality of first ball grooves recessed by the outer peripheral surface and parallel to the axis. The nut member is slidably sleeved on the spline shaft along the axis, and has an inner annular surface opposite to the outer circumferential surface, an outer annular surface opposite to the inner annular surface, and most of the outer annular surface An oil guiding hole connected to the inner annular surface, a pair of second ball grooves recessed in the inner annular surface and opposite to the first ball grooves, and at least one recessed on the outer annular surface and surrounding the axis a three ball groove, and a connecting groove recessed in the outer ring surface and communicating with the third ball groove. The linear bearing unit is mounted to the spline Between the outer peripheral surface of the shaft and the inner annular surface of the nut member, the nut member is linearly slidable relative to the spline shaft, and has a first ball retainer, and the array is mounted on the first ball retaining The first ball in the device, each set of first balls are respectively nested in the corresponding first ball grooves and the second ball grooves. The bearing ring is rotatably sleeved around the nut member around the axis, and has an inner side surface opposite to the outer ring surface, an outer side surface opposite to the inner side surface, and an inner side surface communicates with the inner side surface a side oil hole, and at least one fourth ball groove recessed on the inner side and surrounding the axis, the fourth ball groove is opposite to the third ball groove. The oil passage fitting has a positioning portion installed between the inner side surface and the outer annular surface and having an inverted U-shaped cross section, and an oil guiding passage communicating with the positioning portion and opposite to the oil filling hole, the positioning portion has An oil sump opening toward the outer annular surface and communicating with the oil guiding channel, the oil guiding hole, the oil guiding channel, the oil storage groove and any oil guiding hole together form a communication from the outer side surface to the inner annular surface Continuous oil circuit. The annular bearing unit is mounted between the outer ring surface of the nut member and the inner side surface of the bearing ring, so that the bearing ring can smoothly rotate relative to the nut member, and has a second ball retainer, and A plurality of second balls mounted in the second ball cage, the second balls being nested in the third ball groove and the fourth ball grooves, respectively.

The effect of the invention is that the linear oil bearing unit can be directly oiled by the continuous oil passage, and the oil reservoir can avoid excessive oiling, and the second ball can be uniformly lubricated by the connecting passage. The spline device achieves a better lubrication effect.

10‧‧‧ Splined shaft

L‧‧‧ axis

11‧‧‧ outer perimeter

12‧‧‧First ball groove

20‧‧‧ nut parts

21‧‧‧ Inner torus

22‧‧‧ outer annulus

23‧‧‧ Oil guide hole

24‧‧‧Second ball groove

25‧‧‧3rd ball groove

26‧‧‧Connected channel

30‧‧‧Linear bearing unit

31‧‧‧First Ball Holder

32‧‧‧First Ball

40‧‧‧ bearing ring

41‧‧‧ inside

42‧‧‧Outside

43‧‧‧ oil hole

45‧‧‧fourth ball groove

50‧‧‧ Oil Road Accessories

51‧‧‧ Positioning Department

511‧‧‧Outer end face

512‧‧‧ inside end

513‧‧‧ oil storage tank

52‧‧‧ take over

521‧‧‧ Oil channel

60‧‧‧Round bearing unit

61‧‧‧Second ball retainer

62‧‧‧Second ball

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a perspective view of an embodiment of an oil-fillable spline device of the present invention; An exploded perspective view of the example; FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1; and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG.

1 to 4, an embodiment of the oil-fillable spline device of the present invention includes a spline shaft 10, a nut member 20, a linear bearing unit 30, a bearing ring 40, an oil passage fitting 50, and A circumferential bearing unit 60.

The spline shaft 10 extends along an axis L and has an outer peripheral surface 11, and a plurality of pairs of first ball grooves 12 recessed from the outer peripheral surface 11 and parallel to the axis L, and as shown in FIG. The key shaft 10 is provided with three pairs of first ball grooves 12, each pair of first ball grooves 12 being spaced apart by 120 degrees about the axis L.

The nut member 20 is slidably sleeved on the spline shaft 10 along the axis L, and has an inner annular surface 21 opposite to the outer circumferential surface 11 and an outer annular surface 22 opposite to the inner annular surface 21 a plurality of oil guiding holes 23 communicating with the outer annular surface 22 to the inner annular surface 21, and a plurality of pairs of second ball grooves 24 recessed in the inner annular surface 21 and opposed to the first ball grooves 12 a third ball groove 25 disposed on the outer annular surface 22 and surrounding the axis L, And a plurality of connecting passages 26 parallel to the axis L and recessed to the outer annular surface 22. The oil guiding holes 23 are formed in groups of two. In this embodiment, three sets of oil guiding holes 23 are provided, and each set of oil guiding holes 23 is disposed at an equal angle around the axis L and is separated by 120 degrees. The third ball grooves 25 are spaced apart along the axis L, and the connecting channels 26 are respectively communicated between the third ball grooves 25. The oil guiding holes 23 are disposed between the third ball grooves 25.

The linear bearing unit 30 is mounted between the outer peripheral surface 11 of the spline shaft 10 and the inner annular surface 21 of the nut member 20, so that the nut member 20 can linearly slide relative to the spline shaft 10, the linearity The bearing unit 30 has a first ball retainer 31, and a first ball 32 mounted in the first ball retainer 31, and each set of first balls 32 are respectively nested in the corresponding first ball grooves. 12 and the second ball grooves 24.

The bearing ring 40 is rotatably disposed outside the nut member 30 about the axis L, and has an inner side surface 41 opposite to the outer annular surface 22, an outer side surface 42 opposite to the inner side surface 41, and a The outer side surface 42 communicates with the oil filling hole 43 of the inner side surface 41, and the fourth ball groove 45 which is recessed on the inner side surface 41 and surrounds the axis L, and the fourth ball groove 45 and the third ball groove groove respectively 25 relative.

The oil passage fitting 50 has a positioning portion 51 which is mounted between the inner side surface 41 of the bearing ring 40 and the outer annular surface 22 of the nut member 20 and has an inverted U-shaped cross section, and a connecting portion 51 connected to the positioning portion 51. Take over 52. The positioning portion 51 has an outer end surface 511 which is in contact with the inner side surface 41 and has a convex arc shape, and is opposite to the outer end surface 511 and can be attached thereto. The inner end surface 512 of the outer annular surface 22 and an oil reservoir 513 recessed from the inner end surface 512 and facing the outer annular surface 22 have a concave curved surface. The connecting pipe 52 is installed in the oil filling hole 43 and has an oil guiding passage 521 communicating with the oil storage tank 513, and the oil filling hole 43, the oil guiding passage 521, the oil storage groove 513 and the oil guiding hole 23 are common. A continuous oil passage is formed which is communicated to the inner annular surface 21 by the outer side surface 42. As shown in FIG. 4, the maximum spacing of each set of oil guiding holes 23 corresponding to a circumferential direction around the axis L is smaller than a width corresponding to the oil reservoir 513 of the oil passage fitting 50 corresponding to the circumferential direction. The positioning portion 51 of the present embodiment is made of a material having a low coefficient of friction or porosity, for example, a plastic or felt having a friction coefficient of 0.2 to 0.3.

The bearing unit 60 is mounted between the outer ring surface 22 of the nut member 20 and the inner side surface 41 of the bearing ring 40, so that the bearing ring 40 can smoothly rotate relative to the nut member 20, and has a a second ball retainer 61 and a plurality of second balls 62 mounted in the second ball retainer 61. The second balls 62 are nested in the third ball grooves 25 and the fourth ball grooves 45, respectively. .

As shown in FIG. 3 and FIG. 4, when the operator injects the lubricating grease from the oil filling hole 43 by using the integral structure of the above components, the lubricating grease will follow the The oil filling hole 43, the oil guiding passage 521 flows to the oil storage tank 513, and when the oil passage fitting 50 moves over the oil guiding hole 23 with the bearing ring 40, the lubricating grease can directly pass through the continuous oil passage pair A linear bearing unit 30 located between the spline shaft 10 and the nut member 20 is lubricated, and the nut member 20 is provided relative to the The spline shaft 10 produces a smooth linear movement performance. When the oil passage fitting 50 has not been rotated above the oil guiding holes 23, the lubricating grease is stored in the oil sump 513 without lubrication to avoid excessive oiling.

Therefore, the present invention utilizes the cooperation of the oil passage fitting 50 and the oil guiding holes 23 to increase the time of continuous oil passage communication, and can produce the effect of grease storage, and also provides lubrication for the linear bearing unit 30 and avoids Overfilling of the linear bearing unit 30 occurs. Moreover, the positioning portion 51 of the embodiment is made of a material having a low friction coefficient or a porous property, and the inner end surface 512 of the positioning portion 51 can be prevented from being worn when rotating relative to the outer annular surface 22, and the tightness of the continuous oil passage can be ensured. Sex.

In addition, when the connecting passage 26 of the nut member 20 is in communication with the third ball grooves 25, when the lubricating oil is injected from the oil filling hole 43, when the oil passage fitting 50 moves over any of the connecting passages 26 Lubricating grease can flow evenly through the oil reservoir 513 and the connecting passage 26 to both sides of the circumferential bearing unit 60 to lubricate the second balls 62, thereby producing a better lubricating effect.

In summary, the oil-filled spline device of the present invention has a simple overall structure and can achieve a better lubricating effect, and can indeed achieve the object of the present invention.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

10‧‧‧ Splined shaft

L‧‧‧ axis

11‧‧‧ outer perimeter

12‧‧‧First ball groove

20‧‧‧ nut parts

21‧‧‧ Inner torus

22‧‧‧ outer annulus

23‧‧‧ Oil guide hole

24‧‧‧Second ball groove

41‧‧‧ inside

42‧‧‧Outside

43‧‧‧ oil hole

45‧‧‧fourth ball groove

50‧‧‧ Oil Road Accessories

51‧‧‧ Positioning Department

511‧‧‧Outer end face

512‧‧‧ inside end

513‧‧‧ oil storage tank

25‧‧‧3rd ball groove

26‧‧‧Connected channel

30‧‧‧Linear bearing unit

31‧‧‧First Ball Holder

32‧‧‧First Ball

40‧‧‧ bearing ring

52‧‧‧ take over

521‧‧‧ Oil channel

60‧‧‧Round bearing unit

61‧‧‧Second ball retainer

62‧‧‧Second ball

Claims (8)

An oil-fillable spline device comprising: a spline shaft extending along an axis and having an outer peripheral surface, and a plurality of first ball grooves recessed from the outer peripheral surface and parallel to the axis; a nut member Slidably sleeved on the spline shaft along the axis, and has an inner annular surface opposite to the outer circumferential surface, an outer annular surface opposite to the inner annular surface, and most of the outer annular surface communicates with the outer annular surface An oil guiding hole of the inner ring surface, a pair of second ball grooves recessed on the inner ring surface and opposite to the first ball grooves, and at least one third ball groove recessed on the outer ring surface and surrounding the axis And a connecting passage recessed in the outer annular surface and communicating with the third ball groove; a linear bearing unit is mounted between the outer peripheral surface of the spline shaft and the inner annular surface of the nut member, Having the nut member linearly slide relative to the spline shaft, and having a first ball retainer, and a first ball mounted in the first ball retainer, each set of first balls being nested separately Corresponding to the first ball groove and the second ball groove; a bearing ring can be rotated around the axis The ground cover is disposed outside the nut member and has an inner side surface opposite to the outer annular 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 a fourth ball groove recessed on the inner side surface and surrounding the axis, the fourth ball groove is opposite to the third ball groove; an oil passage fitting having a cross section between the inner side surface and the outer ring surface An locating portion having an inverted U shape, and an oil guiding passage communicating with the positioning portion and opposite to the oiling hole, the positioning portion having an opening facing the outer annular surface and communicating with the oil guiding groove of the oil guiding passage, the oil filling Hole, the oil guide, the reservoir The oil groove and the oil guiding hole together form a continuous oil passage that communicates from the outer side surface to the inner annular surface; and a circumferential bearing unit is mounted between the outer annular surface of the nut member and the inner side surface of the bearing ring The bearing ring can be smoothly rotated relative to the nut member, and has a second ball retainer and a plurality of second balls mounted in the second ball retainer, the second balls being respectively nested in The third ball groove and the fourth ball groove. The oil-fillable spline device of claim 1, wherein the oil guiding holes of the nut member are grouped in groups, and the maximum spacing of each group of oil guiding holes corresponding to a ring around the axis is smaller than the oil path. The sump of the fitting corresponds to a width of the hoop. The oil-fillable spline device of claim 1, wherein the nut member has two third ball grooves, and the third ball grooves are spaced along the axis, the connecting channel is parallel to the axis and Connected between the third ball grooves. The oil-fillable spline device of claim 3, wherein the oil guiding holes of the nut member are grouped in groups, each group of oil guiding holes is disposed at an equal angle around the axis, and the oil guiding oil is The holes are disposed between the third ball grooves. The oil-fillable spline device of claim 1, wherein the oil passage fitting further has a connecting pipe connected to the positioning portion, the connecting pipe is installed in the oiling hole, and the oil guiding passage is disposed in the connecting pipe. The oil-fillable spline device of claim 1, wherein the positioning portion of the oil passage fitting further has an outer end surface that abuts against the inner side surface and has a convex curved surface, and an outer end surface opposite to the outer end surface And can be attached to the inner end of the outer annulus The inner end surface is concavely curved, and the oil storage groove is recessed by the inner end surface. The oil-fillable spline device of claim 6, wherein the positioning portion of the oil passage fitting is made of a material having a low coefficient of friction. The oil-fillable spline device according to claim 6, wherein the positioning portion of the oil passage fitting is made of a porous material.