CN112303202B

CN112303202B - Ball spline with lubricating device

Info

Publication number: CN112303202B
Application number: CN201910705752.0A
Authority: CN
Inventors: 江智煜; 吴建勋; 王政隆
Original assignee: Hiwin Technologies Corp
Current assignee: Hiwin Technologies Corp
Priority date: 2019-08-01
Filing date: 2019-08-01
Publication date: 2021-09-21
Anticipated expiration: 2039-08-01
Also published as: CN112303202A

Abstract

The invention provides a ball spline with a lubricating device, comprising: a long shaft member; the nut piece is sleeved on the long shaft piece; a linear bearing unit provided between the long shaft member and the nut member; the bearing ring is sleeved on the nut piece; and the lubricating device comprises an oil tank and a plurality of oil guide pieces, wherein the oil tank is fixedly arranged at one end of the bearing ring and sleeved on the nut piece, and is provided with an oil tank ring part, an oil storage space for storing lubricating grease is formed between the oil tank ring part and the outer ring surface, each oil guide piece is arranged on the outer ring surface and is positioned in the oil storage space, and the lubricating device is provided with at least one oil guide part, and when the nut piece rotates, the lubricating grease can be guided to the oil filling hole by the oil guide part so as to lubricate the rolling body.

Description

Ball spline with lubricating device

Technical Field

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

Background

As shown in fig. 1, a drawing of a TW I606192 spline device capable of injecting oil is shown, which includes a spline shaft 1, a nut member 3 sleeved on the spline shaft 1 and having a plurality of oil guide holes 2, a linear bearing unit 4 installed between the spline shaft 1 and the nut member 3, a bearing ring 5 rotatably sleeved outside the nut member 3, an oil passage fitting 6 sleeved between the bearing ring 5 and the nut member 3, and a circumferential bearing unit 7 installed between the nut member 3 and the bearing ring 5. The bearing ring 5 is provided with an oil filling hole 8, the oil way fitting 6 is provided with a positioning part 9 and an oil guiding channel 10 relative to the oil filling hole 8, oil storage grooves 11 of the oil filling hole 8, the oil guiding channel 10 and the positioning part 9 and any oil guiding hole 2 jointly form a continuous oil way, the linear bearing unit 4 can be directly filled with oil by utilizing the continuous oil way, excessive oil filling is avoided by the oil storage grooves 11, and the spline device can achieve a better lubricating effect. However, the following drawbacks to be improved are still present in practical use:

when the linear bearing unit 4 is installed between the spline shaft 1 and the nut member 3, it is necessary to provide an effective lubrication function, and if the linear bearing unit is not used under lubrication, the abrasion of the balls 12 installed on the linear bearing unit 4 is increased, thereby shortening the service life of the linear bearing unit, however, in the prior art, when the linear bearing unit is operated, the oil passage fitting 6 must be at a specific angle, the oil storage groove 11 can accurately correspond to the oil guide hole 2, so that the lubrication effect is poor, and multiple times of oil injection are required, thereby affecting the service life and the smoothness of operation.

In the patent I352173, an oil injection device is added, and when the inner nut rotates on the screw, the oil injection device also rotates at the same time, and guides the grease into the guide groove by centrifugal force, and then injects the grease into the surface of the screw through the oil feed hole, so as to achieve lubrication effect.

Disclosure of Invention

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

To achieve the above object, the present invention provides a ball spline with a lubrication device, comprising:

a long shaft member having an outer peripheral surface; the nut piece is sleeved on the long shaft piece and provided with an inner ring surface opposite to the outer peripheral 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 provided between the outer circumferential surface and the inner circumferential surface, and including a ball retainer in which the long shaft member is fitted, and a plurality of rolling elements installed in a ball return passage of the ball retainer; the bearing ring is sleeved on the nut piece; and the lubricating device comprises an oil tank and a plurality of oil guide pieces, wherein the oil tank is fixedly arranged at one end of the bearing ring and sleeved on the nut piece, the oil tank is provided with an oil tank ring part, an oil storage space for storing lubricating grease is formed between the oil tank ring part and the outer ring surface, each oil guide piece is arranged on the outer ring surface and positioned in the oil storage space, and the lubricating device is provided with at least one oil guide part, and when the nut piece rotates, the lubricating grease can be guided to the oil filling hole by the oil guide part so as to lubricate the rolling body.

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

Preferably, each of the ball return passages includes a loaded section and an unloaded section connected to the loaded section and disposed opposite to the oil holes, and the two oil holes of each pair are respectively communicated with the unloaded sections of different ball return passages.

Preferably, the oil guide portion extends toward the oil filler hole and has a guide surface facing the oil filler hole. More preferably, the guide surface is a curved surface or an inclined surface.

Preferably, each oil guiding member has two oil guiding portions extending in opposite directions and corresponding to the two oil holes.

Preferably, each oil guide member has the oil guide portion extending from a side surface toward one of the oil holes.

Preferably, the long shaft member has a plurality of pairs of first ball grooves recessed from the outer peripheral surface, the nut member has a plurality of pairs of second ball grooves disposed on the inner peripheral surface and opposite to the pairs of first ball grooves, and each set of the rolling elements is respectively nested in the corresponding pairs of first ball grooves and the corresponding pairs of second ball grooves.

Accordingly, the invention is characterized in that: an oil tank capable of storing the lubricating grease is fixedly arranged at one end of the bearing ring, a plurality of pairs of oil filling holes communicated from the outer ring surface to the inner ring surface are formed in the nut piece in a penetrating mode, the oil guide pieces are arranged on the outer ring surface and located in the oil tank, and when the nut piece rotates on the long shaft piece in an actuating mode, the lubricating grease can be guided to the oil filling holes through the oil guide portions of the oil guide pieces so as to lubricate the rolling body, and therefore the purposes of avoiding lubricating grease waste and improving lubricating efficiency are achieved.

Drawings

Fig. 1 is a drawing of TW I606192 an oil fillable spline assembly.

Fig. 2 is a perspective assembly view 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 a first embodiment of the present invention.

Figure 5 is a cross-sectional view of the embodiment of figure 4 taken along line 5-5.

Fig. 6 is a usage state diagram (one) of the first embodiment of the present invention.

Fig. 7 is a second usage state diagram of the first embodiment of the present invention.

FIG. 8 is a cross-sectional view of a second embodiment of the present invention showing the guide surface as a sloped surface.

FIG. 9 is a sectional view of the third embodiment of the present invention, showing that each oil guide member has an oil guide portion extending from a side surface toward one of the oil holes.

Fig. 10 is an exploded perspective view of a fourth embodiment of the present invention, showing an oil tank secured to one end of a bearing ring by a plurality of screws.

Fig. 11 is a cross-sectional view of the embodiment of fig. 10.

Description of the symbols in the drawings:

the prior art is as follows:

spline shaft 1 oil guide hole 2

Nut member 3 linear bearing unit 4

Bearing ring 5 oil passage fitting 6

Oil filler hole 8 of annular bearing unit 7

Positioning part 9 oil guide channel 10

Oil storage tank 11 ball 12

The invention comprises the following steps:

axis L Long shaft 20

Outer peripheral surface 21 first ball groove 22

Inner annular surface 31 of nut member 30

Oil hole 33 of outer ring surface 32

Second ball groove 34 is locked with hole 35

First sleeve part 36 and second sleeve part 37

Linear bearing unit 40 ball retainer 41

Ball return passage 42 load zone 421

Non-loaded section 422 rolling elements 43

Bearing ring 50 external thread section 51

Lubricating device 60 oil tank 61

Oil tank ring portion 611 oil storage space 612

Internal thread segment 613 internal ring groove 614

Oil seal 615 oil guide 62

Oil guide 621 guide surface 622

Screw member 80 of locking member 70

O-ring 90 oil seal ring 100

Roller bearing 110

Detailed Description

The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

As shown in fig. 2 to 5, a first embodiment of the present invention provides a ball spline with a lubricating device, which mainly comprises a long shaft member 20, a nut member 30, a linear bearing unit 40, a bearing ring 50, and a lubricating device 60, wherein:

the long shaft 20 extends along the axis L and has an outer circumferential surface 21 and a plurality of pairs of first ball grooves 22 recessed from the outer circumferential surface 21 and parallel to the axis L, and as shown in fig. 4, the long shaft 20 has three pairs of first ball grooves 22, and each pair of first ball grooves 22 is spaced apart by 120 degrees around the axis L.

The nut 30 is slidably fitted over the long shaft member 20 along the axis L, and has an inner annular surface 31 opposite to the outer circumferential surface 21, an outer annular surface 32 opposite to the inner annular surface 31, a plurality of pairs of oblong oil holes 33 connected from the outer annular surface 32 to the inner annular surface 31, and a plurality of pairs of second ball grooves 34 provided in the inner annular surface 31 and opposing the pairs of first ball grooves 22, wherein a locking hole 35 is provided between the two oil holes 33 of each pair, in the present embodiment, three pairs of oil holes 33 are provided, each pair of oil holes 33 is provided at an equal angle around the axis L and spaced apart 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 first sleeve portion 36 has an outer diameter larger than that of the second sleeve portion 37, and the bearing ring 50 is fitted over the first sleeve portion 36 of the nut 30 without contact.

A linear bearing unit 40 disposed between the outer circumferential surface 21 of the long shaft member 20 and the inner circumferential surface 31 of the nut member 30, and having a ball retainer 41 on which the long shaft member 20 is fitted, and a plurality of sets of rolling elements 43 mounted in a ball return passage 42 of the ball retainer 41, each set of rolling elements 43 being respectively fitted in the corresponding two first ball grooves 22 and two second ball grooves 34; in the present embodiment, the rolling elements 43 are balls as an example, but not limited thereto. As shown in fig. 2 and 4, each ball return passage 42 includes a loaded section 421 and an unloaded section 422 connected to both ends of the loaded section 421 and disposed opposite to the oil holes 33, and the two oil holes 33 of each pair are respectively communicated with the unloaded sections 422 of the different ball return passages 42.

The bearing ring 50 is sleeved outside the nut 30 by two roller bearings 110, and has an external thread section 51 at one end, in the embodiment, the roller bearings 110 are ball bearings (ball bearings), but in other embodiments, the invention is not limited thereto, and may also be roller bearings (cylindrical roller bearings) or needle bearings (needle bearings).

Since the assembly methods of the long shaft 20, the linear bearing unit 40, the roller bearing 110 and the bearing ring 50 are the same as the prior art and are not the focus of the present invention, the detailed structure, assembly method and operation method of these components (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 guiding members 62, the oil tank 61 is screwed to one end of the bearing ring 50 and is sleeved on the second sleeve portion 37 of the nut member 30 without contact, but not limited thereto, or as shown in fig. 10 to 11, the oil tank 61 is screwed to one end of the bearing ring 50 by a plurality of screw members 80. 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 annular surface 32, the oil tank ring portion 611 further has an internal thread section 613 screwed with the external thread section 51 of the bearing ring 50, a concave inner ring groove 614, and a stepped oil seal end 615, the inner ring groove 614 is provided for the O-ring 90, as shown in fig. 5, when the oil tank 61 is screwed on the bearing ring 50, the O-ring 90 is compressed by the outer edge of the bearing ring 50, so as to prevent the lubricating grease from overflowing, and the oil seal end 615 provides the oil seal ring 100 for clamping, so that a part of the oil seal ring 100 abuts against the oil seal end 615, and another part of the oil seal ring abuts against the outer annular surface 32 of the nut member 30, thereby achieving the effect of strengthening oil seal and effectively reducing the oil throwing amount. Each oil guiding member 62 is fastened to the locking hole 35 through the fastening member 70 and located in the oil storage space 612, and has two guiding portions 621 extending in opposite directions and corresponding to the two oil injection holes 33, when the nut member 30 rotates on the long shaft member 20, the oil guiding portions 621 can guide the lubricating grease to the oil injection holes 33 to lubricate the rolling elements 43, in this embodiment, each oil guiding portion 621 has a guiding surface 622 facing the oil injection holes 33, the guiding surface 622 is a curved surface as an example, but not limited thereto, or as shown in fig. 8, the guiding surface 622 can also be an inclined surface, and when the guiding surface 622 is a curved surface, the lubricating grease can be stored more, so that the effect of lubricating the rolling elements 43 by the oil guiding portions 621 which are curved surfaces is better than the oil guiding portions 621 which are inclined surfaces.

The above is a configuration description of each main component of the embodiment of the present invention. The efficacy of the present invention is explained below.

As shown in fig. 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 is also driven to rotate, and the lubricating grease is guided to the oil filling hole 33 by the oil guiding portion 621, and then is injected into the ball return channel 42 of the linear bearing unit 40 from the oil filling hole 33, so as to achieve the effect of lubricating the rolling elements 43, thereby avoiding the waste of the lubricating grease and improving the lubricating efficiency, and being capable of prolonging the working time of the ball spline with the lubricating device and reducing the maintenance frequency.

As shown in fig. 8, the guiding surface 622 is an inclined surface, for example, and when the nut member 30 rotates on the long shaft member 20, the inclined surface can make grease slide to the oil hole 33 more smoothly, so as to prevent the grease from being jammed.

It should be noted that, as shown in fig. 9, each oil guiding member 62 has an oil guiding portion 621 extending from a side surface toward one of the oil holes 33, so as to achieve the same effect; in the present embodiment, the oil guiding portion 621 extends from the right side of the oil guiding member 62, but not limited thereto, or from the left side of the oil guiding member 62.

In summary, the above embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A ball spline having a lubrication device, comprising:

a long shaft member (20) having an outer peripheral surface (21);

a nut member (30) which is fitted over the long shaft member (20) and has an inner annular surface (31) opposing the outer peripheral surface (21), an outer annular surface (32) opposing the inner annular surface (31), and a plurality of pairs of oil holes (33) communicating from the outer annular surface (32) to the inner annular surface (31);

a linear bearing unit (40) which is provided between the outer peripheral surface (21) and the inner ring surface (31), and which has a ball retainer (41) on which the long shaft member (20) is fitted, and a plurality of sets of rolling elements (43) which are mounted in ball return passages (42) of the ball retainer (41);

a bearing ring (50) sleeved on the nut member (30); and

lubricating arrangement (60), including oil tank (61) and a plurality of oil guide (62), oil tank (61) set firmly in bearing ring (50) one end and the cover locate nut piece (30), and have oil tank ring portion (611), form oil storage space (612) that supply lubricating grease to store between oil tank ring portion (611) and outer annular surface (32), each oil guide (62) set up outer annular surface (32) and lie in oil storage space (612), and have at least one oil guide (621), when nut piece (30) rotated, oil guide (621) can lead lubricating grease to oil filler point (33) in order to lubricate rolling element (43).

2. The lubrication ball spline according to claim 1, wherein a locking hole (35) for locking the oil guide member (62) is provided between the two oil holes (33) of each pair.

3. The lubricated ball spline according to claim 1, wherein each of the ball return passages (42) comprises a loaded section (421) and an unloaded section (422) connected to the loaded section (421) and disposed opposite to the oil holes (33), and the two oil holes (33) of each pair are respectively communicated with the unloaded sections (422) of the different ball return passages (42).

4. The lubrication ball spline according to claim 1, wherein the oil guide portion (621) extends toward the oil filler hole (33) and has a guide surface (622) facing the oil filler hole (33).

5. The lubricated device ball spline according to claim 4, wherein the guide surface (622) is curved or beveled.

6. The ball spline with lubrication apparatus according to claim 1, wherein each oil guide member (62) has two oil guide portions (621) extending in opposite directions and corresponding to the two oil holes (33).

7. The lubrication ball spline according to claim 1, wherein each oil guide member (62) has an oil guide portion (621) extending from a side surface toward one of the oil holes (33).

8. The lubricated ball spline 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), the nut member (30) has a plurality of pairs of second ball grooves (34) provided on the inner peripheral surface (31) and opposed to the pairs of first ball grooves (22), and each of the rolling elements (43) is fitted in the corresponding pairs of first ball grooves (22) and pairs of second ball grooves (34), respectively.