TWI708903B - Ball spline with lubricating device - Google Patents

Abstract

A ball spline with lubricating device, which includes a long shaft member, a nut mounted on the long shaft member, a linear bearing unit disposed between the long shaft member and the nut, a bearing ring mounted on the nut, and a lubricating device having an oil tank and a plurality of oil guide parts, the oil tank is fixed at one end of the bearing ring and is arranged in the nut without contact, and has a ring part, an oil storage space for storing lubricating oil is formed between the ring part and an outer ring surface, the oil guide parts are disposed at the outer ring surface and are located at the oil storage space, and has an oil storage portion, respectively, when the nut rotates, the oil guide portions can guide the lubricating oil to an oil injection hole for lubricating a rolling body.

Description

Ball spline with lubrication device

The present invention relates to a ball spline, and particularly refers to a ball spline with a lubricating device.

Refer to Figure 1, which shows a diagram of TW I606192 an oil-fillable spline device. The oil-fillable spline device includes a spline shaft 1, a set on the spline shaft 1 and has multiple oil guides The nut 3 of the hole 2, a linear bearing unit 4 installed between the spline shaft 1 and the nut 3, a bearing ring 5 rotatably sleeved outside the nut 3, a set An oil passage fitting 6 arranged between the bearing ring 5 and the nut 3 and an annular bearing unit 7 installed between the nut 3 and the bearing ring 5. The bearing ring 5 has an oil injection hole 8, the oil passage fitting 6 has a positioning portion 9 and an oil introduction passage 10 opposite to the oil injection hole 8, the oil injection hole 8, the oil introduction passage 10, and the positioning portion 9 An oil storage tank 11 and any oil guide hole 2 together form a continuous oil path. The continuous oil path can be used to directly fill the linear bearing unit 4 with oil, and the oil storage tank 11 can avoid overfilling the spline. The device achieves better lubrication effect. However, it still has the following defects that need to be improved in actual use:

When the linear bearing unit 4 is installed between the spline shaft 1 and the nut 3, it must provide an effective lubrication function. If it is used without lubrication, it will increase the ball 12 installed on the linear bearing unit 4 Wear, thereby shortening the life of the lubrication function. However, when the previous patent is in operation, the oil path fitting 6 must be under a certain angle so that the oil storage groove 11 can accurately correspond to the oil guide hole 2, resulting in a better lubrication effect. It is not good, and it needs to be filled with oil several times. As a result, it will affect the service life and smoothness of operation.

Please refer to the I352173 patent, which is equipped with an oil injection device. When the inner nut rotates on the screw, the oil injection device also rotates at the same time, and uses centrifugal force to guide grease into the guide groove, and then inject the screw from the oil hole However, the above-mentioned oil injection device has too many accessories, which will increase the overall axial length and increase the weight of the screw itself. In addition, grease is easily caused by filling the oil hole into the screw surface. Accumulation, in this way, cannot achieve effective lubrication of the balls, and instead causes the lubrication effect to fail.

The object of the present invention is to provide a ball spline with a lubricating device, which can effectively lubricate the rolling elements on the ball retainer, so as to avoid waste of grease and improve lubrication efficiency.

To achieve the foregoing objective, the present invention is a ball spline with a lubricating device, which includes:

A long shaft member having an outer circumferential surface; a nut member sleeved on the long shaft member and having an inner ring surface opposite to the outer circumferential surface, an outer ring surface opposite to the inner ring surface, and A plurality of pairs of oil injection holes communicated from the outer ring surface to the inner ring surface; a linear bearing unit, arranged between the outer circumferential surface and the inner ring surface, and having a set of ball cages with the long shaft, and Multiple arrays of rolling elements installed in the ball return passage of the ball cage; a bearing ring sleeved on the nut member; and a lubricating device including an oil tank and a plurality of oil guides, the oil tank is fixed on the bearing ring One end is sleeved on the nut member and has an oil tank ring portion. An oil storage space for lubricating grease is formed between the oil tank ring portion and the outer ring surface, and each of the oil guides is arranged on the outer ring surface And it is located in the oil storage space and has at least one oil guiding part. When the nut rotates, the oil guiding part can guide the lubricating grease to the oil injection hole to lubricate the rolling elements.

Preferably, a locking hole for locking the oil guide is provided between the two oil injection holes of each pair.

Preferably, each of the ball return passages includes a load section and a non-load section connected to the load section and arranged opposite to the oil injection hole, and the two oil injection holes of each pair respectively communicate with different The non-load section of the ball return channel.

Preferably, the oil guiding part extends toward the oil injection hole and has a guiding surface facing the oil injection hole. More preferably, the guiding surface is a curved surface or an inclined surface.

Preferably, each of the oil guides has two oil guides extending in opposite directions and corresponding to the two oil injection holes.

Preferably, each of the oil guide members has an oil guide portion extending from a side toward one of the oil injection holes.

Preferably, the long shaft member has a plurality of pairs of first ball grooves recessed from the outer circumferential surface, and the nut member has a plurality of pairs of second ball grooves that are provided on the inner ring surface and are opposite to the pairs of first ball grooves. Ball grooves, each group of the rolling bodies is respectively nested in the corresponding pairs of first ball grooves and the pairs of second ball grooves.

Accordingly, the feature of the present invention is that a fuel tank capable of storing the lubricating grease is fixedly provided at one end of the bearing ring, and a plurality of pairs of lubricating oils connected from the outer ring surface to the inner ring surface are pierced on the nut member. Hole, and each of the oil guides is arranged on the outer ring surface and is located in the oil tank. When the nut rotates on the long shaft, the oil guide of each oil guide can lubricate the Grease is guided to the oil injection hole to lubricate the rolling elements, thereby achieving the purpose of avoiding grease waste and improving lubrication efficiency.

Please refer to Figures 2 to 5, the first embodiment of the present invention provides a ball spline with a lubricating device, which is mainly composed of a long shaft member 20, a nut member 30, a linear bearing unit 40, and a bearing ring 50. It is composed of a lubricating device 60, in which:

The long shaft member 20 extends along an axis L and has an outer peripheral surface 21 and a plurality of pairs of first ball grooves 22 recessed from the outer peripheral surface 21 and parallel to the axis L, and as shown in FIG. 4, the The long shaft 20 is provided with three pairs of first ball grooves 22, and each pair of first ball grooves 22 are spaced 120 degrees around the axis L.

The nut member 30 is slidably sleeved on the long shaft member 20 along the axis L, and has an inner ring surface 31 opposite to the outer circumferential surface 21 and an outer ring surface opposite to the inner ring surface 31 32. A plurality of pairs of oil injection holes 33 connected from the outer ring surface 32 to the inner ring surface 31 and in an oblong shape, and a plurality of pairs of first ball grooves 33 arranged on the inner ring surface 31 and opposite to the pairs of first ball grooves 22 There are two ball grooves 34, and a locking hole 35 is provided between the two oil injection holes 33 of each pair. In this embodiment, there are three pairs of oil injection holes 33, and each pair of oil injection holes 33 are at an equal angle around the axis L Set and separated by 120 degrees, the nut 30 further includes a first sleeve portion 36 and a second sleeve portion 37 connected to the first sleeve portion 36. The outer diameter of the first sleeve portion 36 is larger than The outer diameter of the second sleeve portion 37 and the bearing ring 50 are sleeved on the first sleeve portion 36 of the nut 30 without contact.

The linear bearing unit 40 is arranged between the outer peripheral surface 21 of the long shaft member 20 and the inner ring surface 31 of the nut member 30, and has a set of ball retainers 41 provided with the long shaft member 20 and a plurality of groups The rolling elements 43 installed in the ball return channel 42 of the ball cage 41, each group of the rolling elements 43 are respectively embedded in the corresponding two first ball grooves 22 and two second ball grooves 34; this embodiment In the example, the rolling element 43 is a ball as an example, but it is not limited thereto. And as shown in FIGS. 2 and 4, each of the ball return passages 42 includes a load section 421, and a non-load section 422 connected to both ends of the load section 421 and arranged opposite to the oil injection hole 33, and The two oil injection holes 33 of each pair respectively communicate with the non-load sections 422 of the different ball return passages 42.

The bearing ring 50 is sleeved on the outside of the nut 30 by means of two roller bearings 110, and has an external threaded section 51 at one end. In this embodiment, the roller bearing 110 is a ball bearing (ball bearing). ), in other embodiments, it is not limited to this, and it may also be a cylindrical roller bearing or a needle bearing.

Since the assembly methods of the long shaft 20, the linear bearing unit 40, the roller bearing 110, and the bearing ring 50 are all known in the past, and their action methods are the same as those in the past, it is not the focus of this case. The detailed structure, assembly method and operation method of these components (referring to the long shaft 20, the linear bearing unit 40, the roller bearing 110, and the bearing ring 50) will not be described in detail.

The lubricating device 60 includes an oil tank 61 and a plurality of oil guides 62. The oil tank 61 is screwed on one end of the bearing ring 50 and sleeved on the second sleeve portion 37 of the nut 30 without contact. With this as a limitation, or as shown in FIGS. 10 to 11, the oil tank 61 is penetrated by a plurality of screws 80 and then locked to one end of the bearing ring 50. The oil tank 61 has an oil tank ring portion 611, an oil storage space 612 for storing lubricating grease is formed between the oil tank ring portion 611 and the outer ring surface 32, and the oil tank ring portion 611 also has an external contact with the bearing ring 50 The internal thread section 613 screwed by the thread section 51, a recessed inner ring groove 614, and a stepped oil seal end 615, the inner ring groove 614 is provided for an O-ring 90, as shown in FIG. 5 When the oil tank 61 is screwed to the bearing ring 50, the O-ring 90 will be compressed by the outer edge of the bearing ring 50 to prevent the lubricating grease from overflowing, and the oil seal end 615 is provided with an oil seal ring 100 for clamping, A part of the oil seal ring 100 abuts the oil seal end 615, and the other part abuts the outer ring surface 32 of the nut 30 to achieve the effect of strengthening the oil seal and effectively reduce the amount of oil thrown. Each of the oil guides 62 is penetrated by a locking member 70 to be locked in the locking hole 35 and located in the oil storage space 612, and has two oil guides respectively extending in opposite directions and corresponding to the two oil injection holes 33 621. When the nut member 30 rotates on the long shaft member 20, the oil guiding portion 621 can guide the lubricating grease to the oil injection hole 33 to lubricate the rolling element 43. In this embodiment Each of the oil guide portions 621 has a guide surface 622 facing the oil injection hole 33. The guide surface 622 is a curved surface as an example, but is not limited to this, or as shown in FIG. 8, the guide surface 622 The surface 622 can also be an inclined surface. When the guiding surface 622 is a curved surface, because there are more lubricating greases that can be stored, the curved oil guiding portion 621 is more effective in lubricating the rolling elements 43 than the inclined surface The oil guide 621.

The above is the configuration description of the main components of the embodiment of the present invention. As for the efficacy of the present invention, the description is as follows.

6 and 7, when the nut member 30 rotates on the long shaft member 20, the oil guiding portion 621 of the oil guiding member 62 will also be driven to rotate at the same time, and the lubricating grease will be guided by the guide The oil portion 621 is guided to the oil injection hole 33, and then injected from the oil injection hole 33 into the ball return passage 42 of the linear bearing unit 40 to achieve the effect of lubricating the rolling elements 43, thereby avoiding waste of grease and The purpose of improving the lubrication efficiency can prolong the working time of the ball spline with the lubrication device and reduce the frequency of maintenance.

Referring to FIG. 8, the guide surface 622 is an inclined surface as an example. When the nut member 30 rotates on the long shaft member 20, the design of the inclined surface allows the grease to slide more smoothly. Move to the oil filling hole 33 to prevent the problem of the grease being stuck.

It is worth mentioning that, referring to FIG. 9, each of the oil guide members 62 has an oil guide portion 621 extending from the side toward one of the oil injection holes 33, which can also achieve the same effect as described above; in this embodiment The oil guide portion 621 is extended from the right side of the oil guide 62, but it is not limited to this, and it is also the left side of the oil guide 62.

[Learning]

1: Spline shaft

2: oil guide hole

3: Nut parts

4: Linear bearing unit

5: Bearing ring

6: Oil circuit accessories

7: Ring bearing unit

8: Oil injection hole

9: Positioning department

10: lead channel

11: Oil storage tank

12: Ball

〔this invention〕

L: axis

20: Long shaft

21: Outer peripheral surface

22: The first ball groove

30: Nut parts

31: inner ring surface

32: Outer ring surface

33: oil injection hole

34: The second ball groove

35: lock hole

36: The first sleeve part

37: The second sleeve part

40: Linear bearing unit

41: Ball retainer

42: Ball return channel

421: Load section

422: Non-load section

43: rolling element

50: bearing ring

51: External thread section

60: Lubrication device

61: Fuel Tank

611: Fuel Tank Ring

612: Oil Storage Space

613: Internal thread section

614: inner ring groove

615: Oil Sealed End

62: oil guide

621: oil guide

622: guide surface

70: lock firmware

80: Screw parts

90: O-ring

100: oil seal ring

110: Roller bearing

Figure 1 is a diagram of TW I606192 a spline device that can be filled with oil. Fig. 2 is a three-dimensional assembly diagram of the first embodiment of the present invention. Fig. 3 is an exploded perspective view of the first embodiment of the present invention. Fig. 4 is a cross-sectional view of the first embodiment of the present invention. Fig. 5 is a cross-sectional view of the line 5-5 of the embodiment of Fig. 4. Fig. 6 is a use state diagram (1) of the first embodiment of the present invention. Figure 7 is a diagram (2) of the use state of the first embodiment of the present invention. Fig. 8 is a cross-sectional view of the second embodiment of the present invention, showing that the guiding surface is an inclined surface. Fig. 9 is a cross-sectional view of the third embodiment of the present invention, showing that each oil guiding member has an oil guiding portion extending from the side toward one of the oil injection holes. Fig. 10 is a perspective exploded view of the fourth embodiment of the present invention, showing that the oil tank is locked to one end of the bearing ring through a plurality of screws. Fig. 11 is a cross-sectional view of the embodiment of Fig. 10;

L: axis

20: Long shaft

21: Outer peripheral surface

22: The first ball groove

30: Nut parts

31: inner ring surface

32: Outer ring surface

33: oil injection hole

34: The second ball groove

35: lock hole

36: The first sleeve part

37: The second sleeve part

40: Linear bearing unit

41: Ball retainer

42: Ball return channel

421: Load section

422: Non-load section

43: rolling element

50: bearing ring

51: External thread section

60: Lubrication device

61: Fuel Tank

611: Fuel Tank Ring

612: Oil Storage Space

613: Internal thread section

614: inner ring groove

615: Oil Sealed End

62: oil guide

621: oil guide

622: guide surface

70: lock firmware

90: O-ring

100: oil seal ring

Claims (8)

A ball spline with lubricating device, including: A long shaft (20) with an outer peripheral surface (21); A nut member (30) is sleeved on the long shaft member (20) and has an inner ring surface (31) opposite to the outer peripheral surface (21), and an inner ring surface (31) opposite to the inner ring surface (31) The outer ring surface (32), and a plurality of pairs of oil injection holes (33) connected to the inner ring surface (31) from the outer ring surface (32); A linear bearing unit (40) is arranged between the outer peripheral surface (21) and the inner ring surface (31), and has a set of ball cages (41) provided with the long shaft (20), and a plurality of groups The rolling element (43) installed in the ball return channel (42) of the ball cage (41); A bearing ring (50) sleeved on the nut member (30); and A lubrication device (60), including an oil tank (61) and a plurality of oil guide parts (62), the oil tank (61) is fixedly arranged at one end of the bearing ring (50) and sleeved on the nut part (30), and There is an oil tank ring portion (611), an oil storage space (612) for storing lubricating grease is formed between the oil tank ring portion (611) and the outer ring surface (32), and each oil guide piece (62) is arranged in The outer ring surface (32) is located in the oil storage space (612) and has at least one oil guiding portion (621). When the nut (30) rotates, the oil guiding portion (621) can lubricate the Grease is guided to the oil injection hole (33) to lubricate the rolling element (43). In the ball spline with lubrication device as described in claim 1, a lock hole (35) for locking the oil guide (62) is provided between the two oil injection holes (33) of each pair. The ball spline with a lubricating device according to claim 1, wherein each ball return channel (42) includes a load section (421), and a load section (421) connected to the load section (421) and connected to the oil injection hole ( 33) The non-load sections (422) are oppositely arranged, and the two oil injection holes (33) of each pair are respectively connected to the non-load sections (422) of the different ball return passages (42). The ball spline with lubricating device according to claim 1, wherein the oil guide portion (621) extends toward the oil injection hole (33) and has a guide surface (which faces the oil injection hole (33)). 622). The ball spline with lubricating device according to claim 4, wherein the guiding surface (622) is a curved surface or an inclined surface. The ball spline with a lubricating device according to claim 1, wherein each of the oil guides (62) has two oil guides (621) extending in opposite directions and corresponding to the two oil injection holes (33). The ball spline with a lubricating device according to claim 1, wherein each of the oil guide members (62) has an oil guide portion (621) extending from a side toward one of the oil injection holes (33). The ball spline with lubricating device according to claim 1, wherein the long shaft member (20) has a plurality of pairs of first ball grooves (22) recessed from the outer peripheral surface (21), and the nut member (30) ) Has a plurality of pairs of second ball grooves (34) arranged on the inner ring surface (31) and opposite to the pairs of first ball grooves (22), and each group of the rolling elements (43) is respectively nested in the corresponding The pairs of first ball grooves (22) and the pairs of second ball grooves (34).

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