CN201786929U

CN201786929U - Ball spline device

Info

Publication number: CN201786929U
Application number: CN2010201145823U
Authority: CN
Inventors: 李进胜; 杨进财
Original assignee: COMTOP TECHNOLOGY Co Ltd
Current assignee: TBI Motion Technology Co., Ltd.
Priority date: 2010-02-03
Filing date: 2010-02-03
Publication date: 2011-04-06
Anticipated expiration: 2020-02-03

Abstract

A ball spline device comprises a spline shaft, an outer drum, a ball retainer and two end covers. The spline shaft is provided with a first ball groove; the outer drum slidably sleeved on the spline shaft is provided with a positioning groove and a second ball groove; the ball retainer arranged between the spline shaft and the outer drum is provided with a positioning rib and a ball hole; the positioning rib is correspondingly connected with the positioning groove; the ball hole together with the first ball groove and the second ball groove correspondingly forms a ball passage; and the end covers sleeved on the spline shaft are respectively arranged at two ends of the outer drum. Accordingly, processing of the second ball groove can be simpler and easier, and manufacturing cost can be further reduced.

Description

Ball spline device

Technical field

The utility model is about a kind of ball spline device.

Background technique

In various ball spline devices,, can allow urceolus on straight line, move by cooperating of urceolus and splined shaft.In addition, by the ball of start capable of circulation, can reduce the frictional force between urceolus and splined shaft again, make ball spline device more smooth-going when operation.

Please refer to shown in Figure 1, a kind of sectional drawing of known ball spline device.Ball spline device S 1 comprises a splined shaft 1, a urceolus 2 and two end cap (not shown), and urceolus 2 is sheathed and be slidingly installed in splined shaft 1, and end cap then is arranged on the two ends of urceolus 2.Wherein, splined shaft 1 and urceolus 2 have two ball grooves 11,21 respectively, and ball grooves 11,21 can form ball channel P jointly, and urceolus 2 also has circulation canal 22, and the return flow line (not shown) that covers of abutting end can form ball circulation paths again.

Therefore, in ball circulation paths, roll, can make urceolus 2 on splined shaft 1, carry out straight line motion, so that urceolus 2 moves along splined shaft 1 by a plurality of ball B.Be noted that for clearly demonstrating, the ball circulation paths of below does not show ball B among Fig. 1.

Yet in ball spline device S1, the ball grooves 22 of urceolus 2 drops for fear of ball B, and its structure is the narrower form of opening.Therefore, in order to be processed to form ball grooves 22 at urceolus 2, must be through the processing of two workshop sections, for example earlier by D processing fluting radially, but because radially D processes the ball grooves 22 that can't effectively process with ball B form fit, therefore must process ball grooves 22 again via axially (direction of vertical drawing) processing with ball B form fit.So, not only fabricating cost is higher, and axially adds man-hour, also is difficult to accurately process the ball grooves 22 that mates with ball B.

The model utility content

The purpose of this utility model provides a kind of processing and lower ball spline device of fabricating cost of being easy to.

The utility model can be realized by the following technical solutions.

A kind of ball spline device of the present utility model comprises a splined shaft, a urceolus, a ball distance ring and two end caps.Splined shaft has one first ball grooves, and urceolus is sheathed and be slidingly arranged in splined shaft, has a locating slot and one second ball grooves.Ball distance ring is arranged between splined shaft and urceolus, has a location rib and a ball perforate, the corresponding connection with locating slot of positioning rib, corresponding formation one ball channel with first ball grooves and second ball grooves of ball perforate.Described end cap is set in splined shaft, and is separately positioned on the two ends of urceolus.

Aforesaid ball spline device, wherein said urceolus has a circulation canal, each end cap has a return flow line, position, described return flow line is at the two ends of described ball channel and described circulation canal, and the common ball circulation paths that forms in described ball channel, described circulation canal and described return flow line.

Aforesaid ball spline device wherein also comprises: a plurality of balls are arranged on described ball circulation paths.

Aforesaid ball spline device, wherein each end cap has a backflow piece, and described backflow piece forms described return flow line.

Aforesaid ball spline device, wherein said urceolus has a flange.

Aforesaid ball spline device, wherein said ball distance ring have location a projection and the corresponding connection of described first ball grooves.

By technique scheme, ball spline device of the present utility model has following advantage at least:

From the above, have a ball distance ring according to ball spline device of the present utility model, and ball distance ring has the ball perforate.Therefore, by the ball perforate of ball distance ring, ball still can contact splined shaft and urceolus simultaneously, so that urceolus can be relatively slide at splined shaft, and ball can remain between ball distance ring and the urceolus and avoids dropping.Therefore, second ball grooves of ball spline device urceolus of the present utility model need not form the narrower structure of opening as is well known, can make the processing of second ball grooves comparatively simple and easy whereby, and can further reduce fabricating cost.

Description of drawings

Fig. 1 is a kind of sectional drawing of known ball spline device;

Fig. 2 is the decomposing schematic representation of the ball spline device of the utility model preferred embodiment,

Fig. 3 is as the sectional drawing after the ball spline device combination of Fig. 2;

Fig. 4 is another aspect decomposing schematic representation of the ball spline device of the utility model preferred embodiment; And

Fig. 5 and Fig. 6 are the different aspect decomposing schematic representations of end cap of the ball spline device of the utility model preferred embodiment.

The primary component symbol description:

(known)

1: splined shaft

11,21: ball grooves

2: urceolus

22: circulation canal

B: ball

D: radially

S1: ball spline device

(the utility model)

3: splined shaft

31: the first ball grooves

4,4a: urceolus

41: locating slot

42: the second ball grooves

43: circulation canal

44: flange

5,5a: ball distance ring

51: positioning rib

52: the ball perforate

53: locating bump

6,6a, 6b: end cap

61: the return flow line

62,62b: backflow piece

S2, S3: ball spline device

B: ball

R: ball circulation paths

Embodiment

Hereinafter with reference to correlative type, a kind of ball spline device according to the utility model preferred embodiment is described, wherein same components is represented with same-sign.

Please refer to Fig. 2 and shown in Figure 3, wherein Fig. 2 is the decomposing schematic representation of the ball spline device of the utility model preferred embodiment, and Fig. 3 is as the sectional drawing after the ball spline device combination of Fig. 2.Ball spline device S2 comprises a splined shaft 3, a urceolus 4, a ball distance ring 5 and two end caps 6.

Splined shaft 3 has one first ball grooves 31.In the present embodiment, having three first ball grooves 31 with splined shaft 3 is example, and it is non-limiting, requires and design according to different, and splined shaft 3 also can have one or two first ball grooves 31, perhaps also can more than three first ball grooves 31.

Urceolus 4 is sheathed and be slidingly arranged in splined shaft 3, has a locating slot 41 and one second ball grooves 42.In the present embodiment, have three locating slots 41 and three second ball grooves 42 are example with urceolus 4, it is non-limiting, require and design according to different, urceolus 4 also can have one or two locating slot 41, perhaps more than three locating slots 41 also can, the number of second ball grooves 42 is then corresponding to first ball grooves 31.

Ball distance ring 5 is arranged on 4 of splined shaft 3 and urceolus, has a location rib 51 and a ball perforate 52, positioning rib 51 and locating slot 41 corresponding connections, ball perforate 52 and first ball grooves 31 and second ball grooves, 42 corresponding formation one ball channels.In the present embodiment, have three positioning ribs 51 and three ball perforates 52 are example with ball distance ring 5, it is non-limiting, the number of positioning rib 51 and ball perforate 52 can distinguish corresponding at the locating slot 41 and first ball grooves 31 number and change.

Described end cap 6 is set in splined shaft 3, and is separately positioned on the two ends of urceolus 4.In addition, urceolus 4 also has a circulation canal 43, each end cap 6 has a return flow line 61, and described return flow line 61 is positioned at the two ends of ball channel and circulation canal 43, and ball channel, circulation canal 43 and the described return flow line 61 common ball circulation paths R that form.A plurality of ball B then are arranged on ball circulation paths R.

Therefore, in ball circulation paths R, roll, can make urceolus 4 on splined shaft 3, carry out straight line motion, so that urceolus 4 moves along splined shaft 3 by a plurality of ball B.Be noted that for clearly demonstrating, the ball circulation paths R of below does not show ball B among Fig. 2 and Fig. 3.Moreover, can allow ball B contact splined shaft 3 and urceolus 4 simultaneously by ball distance ring 5, urceolus 4 can also slide with respect to splined shaft 3, and ball B can remain between ball distance ring 5 and the urceolus 4 and avoids dropping.Therefore, second ball grooves 42 of the urceolus 4 of the ball spline device S2 of present embodiment need not form the narrower structure of opening as is well known, can make the processing of second ball grooves 42 comparatively simple and easy whereby, and can further reduce fabricating cost.In addition, ball distance ring 5 also can fix with locating slot 41 corresponding connections by positioning rib 51, avoiding rotational displacement, and avoids axially (the major axis bearing of trend of parallel splined shaft 3) to go up moving displacement by described end cap 6.In addition, ball distance ring 5 also can have location a projection 53 and the 31 corresponding connections of first ball grooves, and it is non-limiting, can further avoid ball to hold the rotational displacement of device 5 whereby.

Please refer to shown in Figure 4, another aspect decomposing schematic representation of the ball spline device of the utility model preferred embodiment.The ball spline device S3 of present embodiment and the difference of previous embodiment are that urceolus 4a has a flange 44.Whereby, can increase the application area of ball spline device S3 of the present utility model.

Please refer to shown in Figure 5, another aspect decomposing schematic representation of the end cap of the ball spline device of the utility model preferred embodiment.In the present embodiment, each end cap 6a can have a backflow piece 62, and backflow piece 62 forms return flow line 61.In the present embodiment, having three backflow pieces 62 with each end cap 6a is that example explains, and it is non-limiting.Moreover more described backflow piece 62 can engage respectively, gummed, sealed, fasten, be entrenched in end cap 6a.In the present embodiment, with more described backflow piece 62 all with end cap 6a chimeric and the gummed be fixed as example, it is non-limiting.Whereby, can reduce the difficulty of processing of end cap 6a, further to reduce fabricating cost.

Please refer to shown in Figure 6, another aspect decomposing schematic representation of the end cap of the ball spline device of the utility model preferred embodiment.In the present embodiment, each end cap 6b has backflow piece 62b equally, and backflow piece 62b forms return flow line 61.In the present embodiment, having two backflow piece 62b with each end cap 6b is that example explains, and it is non-limiting.Moreover more described backflow piece 62b can engage respectively, gummed, sealed, fasten, be entrenched in end cap 6b.In the present embodiment, all being fixed with end cap 6b with more described backflow piece 62b is example, and it is non-limiting.In addition, ball distance ring 5a can change by corresponding end cap 6b.Whereby, can reduce the difficulty of processing of end cap 6b, further to reduce fabricating cost.

In sum, have a ball distance ring according to ball spline device of the present utility model, and ball distance ring has the ball perforate.Therefore, by the ball perforate of ball distance ring, ball still can contact splined shaft and urceolus simultaneously, so that urceolus can be relatively slide at splined shaft, and ball can remain between ball distance ring and the urceolus and avoids dropping.Therefore, second ball grooves of the urceolus of ball spline device of the present utility model need not form the narrower structure of opening as is well known, can make the processing of second ball grooves comparatively simple and easy whereby, and can further reduce fabricating cost.

The above only is an illustrative, but not is restricted person.Anyly do not break away from spirit of the present utility model and category, and, all should be included in the claim institute restricted portion its equivalent modifications of carrying out or change.

Claims

1. a ball spline device is characterized in that, comprising:

One splined shaft has one first ball grooves;

One urceolus, sheathed and slip is arranged at described splined shaft, has a locating slot and one second ball grooves;

One ball distance ring, be arranged between described splined shaft and the described urceolus, have a location rib and a ball perforate, the corresponding connection of described positioning rib, described ball perforate and corresponding formation one ball channel of described first ball grooves and described second ball grooves with described locating slot; And

Two end caps are set in described splined shaft, and are separately positioned on the two ends of described urceolus.

2. ball spline device according to claim 1, it is characterized in that, described urceolus has a circulation canal, each end cap has a return flow line, described return flow line is positioned at the two ends of described ball channel and described circulation canal, and the common ball circulation paths that forms in described ball channel, described circulation canal and described return flow line.

3. ball spline device according to claim 2 is characterized in that, also comprises:

A plurality of balls are arranged on described ball circulation paths.

4. ball spline device according to claim 2 is characterized in that, each end cap has a backflow piece, and described backflow piece forms described return flow line.

5. ball spline device according to claim 1 is characterized in that described urceolus has a flange.

6. ball spline device according to claim 1 is characterized in that, described ball distance ring has location a projection and the corresponding connection of described first ball grooves.