CN201810736U

CN201810736U - External circulating ball screw

Info

Publication number: CN201810736U
Application number: CN201020559990XU
Authority: CN
Inventors: 李玉山
Original assignee: Hiwin Technologies Corp
Current assignee: Hiwin Technologies Corp
Priority date: 2010-10-13
Filing date: 2010-10-13
Publication date: 2011-04-27
Anticipated expiration: 2020-10-13

Abstract

The utility model discloses an external circulating ball screw, which comprises a long shaft, a nut and two circulating assemblies, wherein a rolling channel is formed on the outer edge surface of the long shaft; a through hole on which the long shaft can be sleeved is formed on the nut; the inner edge surface of the through hole is provided with a rolling groove; the rolling channel and the rolling groove form a load path; a plurality of mounting holes are formed on the outer edge surface of the nut; the mounting holes are connected with the rolling groove; one end of one circulating assembly is in butt joint with one end of the other circulating assembly, and the other ends of the circulating assemblies are inserted into the mounting holes respectively; the circulating assembly comprises an upper circulating body and a lower circulating body, and the two circulating bodies are provided with semi-backflow channels respectively; and the external circulating ball screw is convenient to assemble and has low cost. During assembly, two lower circulating bodies are arranged in the mounting holes, rolling bodies are placed in the semi-backflow channels one by one until two semi-backflow channels are full, and a cover of the upper circulating body is arranged on the lower circulating body so as to form the circulating assemblies.

Description

External circulation type ball bolt

Technical field

The utility model relates to a kind of external circulation type ball bolt.

Background technique

See also Figure 1 and Figure 2, it is the employed external circulation type ball bolt of present industry, comprises: a major axis 1, its outer edge surface are provided with spiral helicine sliding channel 11; One nut 2, it is provided with the perforation 21 that wears for this major axis 1, these 21 inner edge surfaces of boring a hole are provided with the rolling groove 211 of this sliding channel 11 relatively, this sliding channel 11 constitutes a load path (not shown) with rolling groove 211, the ccontaining a plurality of rolling element (not shown)s of this load path, this rolling element is as the driving medium between major axis 1 and the nut 2, and these nut 2 outer edge surfaces are provided with a plurality of mounting holes 22 that run through these nut 2 walls and be communicated with this perforation 21; Four recirculation assemblies 4, its external form generally is the L font, this recirculation assembly 4 has a backflow road 43, and this recirculation assembly 4 is inserted in this mounting hole 22, one end in this backflow road 43 is connected with this load path, and should be connected with the backflow road 43 of another recirculation assembly 4 by backflow road 43 the other ends, make the backflow road 43 of two these recirculation assemblies 4 constitute a cyclic track (not shown), this cyclic track provides this rolling element circulating reflux to use, nut 2 can back and forth be moved on major axis 1, in addition, also be provided with a fixed cover 3 outside this nut 2, this fixed cover 3 has a fixed groove (not shown), and this fixed groove is located this recirculation assembly 4 on nut 2, but the prior art has following problem after using:

Please consult shown in Figure 2 again, this recirculation assembly 4 is made up of first member 41 and second member 42, and its both compound modes are combined into this recirculation assembly 4 by concavo-convex cooperation or gluing mode, but problem is: this first member 41 and second member 42 serve as the combination or the direction (as shown in Figure 2) of separating with the footpath direction g of this mounting hole 22, make the assembly crewman who makes ball screw assemble rolling element at 43 o'clock to refluxing, after just must earlier rolling element being inserted the backflow road 43 of recirculation assembly 4, again recirculation assembly 4 is inserted in mounting hole 22, but by above-mentioned this backflow road 43 of learning is a path that connects, so rolling element inserted before the backflow road 43 must be earlier the outlet of the end in backflow road 43 be sealed, can prevent that so just the rolling element of inserting from dropping out outside the backflow road 43, yet, just the outlet of sealing must be opened in the time of recirculation assembly 4 will being inserted mounting hole 22, rolling element just was easy to and dropped out outside the backflow road 43 this moment, perhaps another kind of mode, using more sticky lubricating grease that rolling element is stained with one by one sticks in backflow road 43, but it is quite slow in fact to be stained with glutinous speed so one by one, especially for the rolling element of reduced size, be stained with when glutinous difficulty especially, because all can once just successfully being stained with usually, rolling element sticks in the backflow road, because assist to be stained with the lubricating grease of adhering to is also arranged on the glutinous fixture, so fixture can stick in the rolling element in backflow road 43 but also band from the backflow road originally being stained with not only.In sum, these two kinds of installation step are all quite loaded down with trivial details, make that also installation time significantly increases, and also increase the cost of production of ball screw relatively, and reduce manufacturing efficiency, therefore, still have necessity of the improvement that progresses greatly.

The model utility content

The technical problems to be solved in the utility model provides a kind of external circulation type ball bolt, and it is easy to assembly and cost is low.

For solving the problems of the technologies described above, external circulation type ball bolt of the present utility model comprises:

One major axis, external form are that a strip and cross section are circle, and the outer edge surface of this major axis is provided with spiral helicine sliding channel;

One nut, be provided with one for the sheathed perforation of major axis, the inner edge surface of this perforation is provided with the rolling groove of relative sliding channel, and sliding channel and rolling groove constitute a load path, and this nut outer edge surface be provided with a plurality of be inclined to set and with the mounting holes that are communicated with of perforation, this mounting hole rolling groove that continues;

Two recirculation assemblies, this recirculation assembly external form roughly is the L font, and an end of two recirculation assemblies docks mutually, and the end that two recirculation assemblies are not connected mutually is inserted in mounting hole separately respectively; And this recirculation assembly comprises a cocycle body and reaches loop body, the cocycle body reaches down, and loop body is respectively equipped with half backflow road, the cocycle body reaches when loop body is combined into recirculation assembly down, two halves backflow road constitutes a backflow road, and the backflow road of two recirculation assemblies is connected mutually, makes two backflow roads constitute a return flow path, and the two ends of this return flow path are connected with load path, to constitute a complete circulating path, ccontaining a plurality of rolling elements in this circulating path; And loop body served as the direction of combination or separation with the axle direction of mounting hole under the cocycle body reached.

Loop body was respectively equipped with the positioning part of a plurality of concavo-convex cooperations under described cocycle body reached.

Be provided with breasting face around the mounting hole of described nut, following loop body is provided with an abutment facing, and this abutment facing fits in breasting face, to limit the rotary freedom of this straightway.

Described cocycle body and down loop body respectively have two mating faces, this mating face is in contact with one another, and this mating face and cocycle body and loop body combination or the direction of separating are about and be arranged in parallel down.

Described external circulation type ball bolt also has a fixed cover that is installed in this nut, and this fixed cover has a fixed groove, the ccontaining and canned cycle assembly of this fixed groove.

External circulation type ball bolt of the present utility model is when assembling, as long as earlier two following loop bodies are arranged in the mounting hole, again rolling element is placed on one by one half backflow road to filling up two and half backflow roads, at last the cocycle body is covered on down loop body and can forms recirculation assembly, therefore, assemble very simple, thereby make efficiency of assembling significantly improve, simultaneously, owing to need not use any fixture or supplement, therefore, also can reduce cost.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:

Fig. 1 is existing external circulation type ball bolt stereogram;

Fig. 2 is the nut of existing external circulation type ball bolt and the upright figure of group of recirculation assembly;

Fig. 3 is a partial sectional view of the present utility model;

Fig. 4 is a partial exploded view of the present utility model;

Fig. 5 is the exploded view of a nut of the present utility model and a recirculation assembly;

Fig. 6 is the assembling schematic representation of nut of the present utility model, recirculation assembly (following circulation piece) and rolling element;

Fig. 7 is the cocycle part of the utility model recirculation assembly and the exploded view of following circulation piece;

Fig. 8 A is the utility model cocycle part stereogram;

Fig. 8 B is a circulation piece stereogram under the utility model;

Fig. 9 is the cocycle part and the upright figure of the group of following circulation piece of the utility model recirculation assembly;

Figure 10 is the front elevation of the utility model recirculation assembly;

Figure 11 is the sectional view of the utility model nut, recirculation assembly and fixed cover.

Description of reference numerals is as follows among the figure:

1: major axis 11: sliding channel

2: nut 21: perforation

211: rolling groove 22: mounting hole

3: fixed cover 4: recirculation assembly

42: the second members of 41: the first members

43: backflow road g: the footpath direction

5: major axis 51: sliding channel

6: nut 61: perforation

611: rolling groove 62: mounting hole

621: axis D: angle

63: breasting face 7: fixed cover

71: fixed groove 8: the circulation group

8A: be connected section part 8B: the section of plugging

81: backflow road 82: the cocycle body

821,831: partly reflux 822,833: the positioning part

823,835: mating face 83: following loop body

832: fairlead 834: abutment facing

81A: straightway 81B: the section of turning to

81C: guiding section 9: rolling element

100: load path X: cohesive position

B: the Y of bump place: rolling element approach axis

G: axle direction R: rotary freedom

T: direction of displacement C: detaching direction

Embodiment

Understand for technology contents of the present utility model, characteristics and effect being had more specifically, existing in conjunction with illustrated mode of execution, details are as follows:

See also Fig. 3 to shown in Figure 11, the utility model is a kind of external circulation type ball bolt, comprises:

One major axis 5, its external form are that a strip and cross section are circle, and the outer edge surface of this major axis 5 is provided with spiral helicine sliding channel 51;

One nut 6, be provided with one for the sheathed perforation 61 of this major axis 5, the inner edge surface of this perforation 61 is provided with the rolling groove 611 of this sliding channel 51 relatively, this sliding channel 51 constitutes a load path 100 with rolling groove 611, and these nut 6 outer edge surfaces are provided with a plurality of mounting holes 62 that are inclined to set and are communicated with this perforation 61 and (illustrate what is meant by the mounting hole 62 that is obliquely installed at this, see also shown in Figure 11, the breasting face 63 that this mounting hole 62 has an axis 621 and this nut 6 has an angle D, the angular range of this angle D is less than 90 degree, so claim this mounting hole 62 for being obliquely installed greater than 0 degree; In addition, the bearing of trend of the axis 621 of this mounting hole 62 is defined as axle direction G), this mounting hole 62 this rolling groove 611 that continues; And be provided with breasting face 63 around this mounting hole 62;

(present embodiment is four recirculation assemblies 8 at least two recirculation assemblies 8, be one group in twos, so have four recirculation assemblies 8, and illustrate with two recirculation assemblies 8 for convenience of description), two these recirculation assembly external forms roughly are the L font, are made of a linking section 8A and the section of plugging 8B at least, and two these recirculation assemblies 8 are connected section 8A and dock mutually, and this section of plugging 8B distinctly is inserted in mounting hole 62 (the installation aspect of recirculation assembly sees also shown in Figure 4); And this recirculation assembly 8 comprises a cocycle body 82 and reaches loop body 83, this cocycle body 82 reaches down, and loop body 83 is respectively equipped with half backflow road 821,831, this cocycle body 82 reaches when loop body 83 is combined into this recirculation assembly 8 down, two these 821,831 formations, one backflow roads 81 that partly reflux, this backflow road 81 has straightway 81A, the section of turning to 81B and guiding section 81C, and the backflow road 81 of two these recirculation assemblies 8 interconnects by the linking of this linking section 8A, makes two backflow roads 81 constitute a return flow path and (does not show; Return flow path of the present utility model necessarily must two recirculation assemblies the backflow road could constitute, and this recirculation assembly is with the plastics injection molding), the two ends of this return flow path are connected with this load path 100, and the two ends of this return flow path and this load path 100 (further define for tangent setting, for the guiding section 81C and the load path 100 in this backflow road 81 is tangent setting), to constitute a complete circulating path (not shown), ccontaining a plurality of rolling elements 9 in this circulating path, this rolling element 9 are the driving medium between major axis 5 and the nut 6; The two ends of this return flow path respectively are being provided with a fairlead 832 on the loop body 83 down in addition, and this fairlead 832 enters return flow path in order to guiding rolling element 9, so that the circulation of rolling element 9 is more smooth and easy;

One fixed cover 7 is covered on the breasting face 63, and has a fixed groove 71, and this fixed groove 71 is ccontaining and fix this recirculation assembly 8.

Configuration between each assembly more than is described, below describes means and effect between each assembly in detail:

See also Fig. 5 and shown in Figure 6, loop body 83 served as the direction of combination or separation with the axle direction G of this mounting hole 62 under this cocycle body 82 reached, so design can conveniently be inserted backflow road 81 with rolling element 9, because when ball screw is assembled, as long as earlier two following loop bodies 83 are arranged in the mounting hole (as shown in Figure 6, prerequisite is that rolling element 9 has filled up whole load path 100, rolling element 9 just can not fall in the load path 100 always like this), again rolling element 9 is placed on one by one half backflow road 831 after fill up two and half backflow roads 831, cocycle body 82 can be covered on down loop body 83 and form recirculation assembly 8, thus, promptly finish the assembling of ball screw, so the design of recirculation assembly 8 of the present utility model significantly is better than existing recirculation assembly on efficiency of assembling, and need not use any fixture and supplement (lubricating grease etc.), relatively save these costs yet.

Moreover, see also Fig. 7 and shown in Figure 10, for make this cocycle body 82 and down loop body 83 both in conjunction with the time preferable fixed effect arranged, under reaching, this cocycle body 82 is respectively equipped with the positioning part 822 of a plurality of concavo-convex cooperations on the loop body 83,833, these positioning parts 822,833 can prevent rolling element 9 to enter backflow road 81 time, be exceedingly fast so can produce the collision (section of turning to 81B especially because of speed with backflow road 81 walls, as the B of bump place that Figure 10 indicated, because speed is exceedingly fast rolling element 9 (the rolling element direct of travel is shown in Y) when entering guiding section 81C, and guiding section 81C then to be connected be exactly the section of turning to 81B, and should have the function that guiding rolling element 9 turns to by the B of bump place, make rolling element 9 be diverted to the straightway 81A in backflow road 81 smoothly), so can avoid this cocycle body 82 and produce between the loop body 83 down separating, and also can increase the bulk strength of recirculation assembly 8.

Then, see also shown in Figure 10, for life-span and the intensity of more strengthening recirculation assembly 8, loop body 83 respectively has the mating face 823 that the two-phase mutual connection touches so this cocycle body 82 reaches down, 835, and the utility model is especially with this mating face 823,835 designs and this cocycle body 82 and loop body 83 combinations or the direction of separating are about the relation that be arranged in parallel down, as shown in figure 10, two mating faces 823, the 835 closing line X that produced of back that contact are not positioned on the B of bump place, and by positioning part 822,833 design, can prevent cocycle body 82 to produce with following loop body 83 to the C direction separates, so, can avoid mating face 823,835 are positioned at the B of bump place of the section of turning to 81B, making the B of bump place is a complete curved surface, so have higher intensity, relatively also promotes its serviceability.

At last, see also shown in Figure 11, be provided with breasting face 63 around the mounting hole 62 of this nut 6, this time loop body 83 is provided with an abutment facing 834, this abutment facing 834 is fitted on the breasting face 63, so design can be offset the impact force that rolling element 9 is produced when entering the guiding section 81C in this backflow road 81, with the degrees of freedom R of the linking section 8A rotation that limits this recirculation assembly 8, and limits the displacement that the section of the plugging 8B of this recirculation assembly 8 also can not produce the T direction.

The above embodiment is used to illustrate the utility model, is not in order to restriction the utility model, so the displacement of the variation of every numerical value and equivalent elements must be subordinate to category of the present utility model.

Claims

1. an external circulation type ball bolt is characterized in that, comprises:

2. external circulation type ball bolt as claimed in claim 1 is characterized in that: loop body was respectively equipped with the positioning part of a plurality of concavo-convex cooperations under described cocycle body reached.

3. external circulation type ball bolt as claimed in claim 1 is characterized in that: be provided with breasting face around the mounting hole of described nut, following loop body is provided with an abutment facing, and this abutment facing fits in breasting face, to limit the rotary freedom of this straightway.

4. external circulation type ball bolt as claimed in claim 1, it is characterized in that: loop body respectively had two mating faces under described cocycle body reached, this mating face is in contact with one another, and this mating face and cocycle body and loop body combination or the direction of separating are about and be arranged in parallel down.

5. external circulation type ball bolt as claimed in claim 1 is characterized in that: also have a fixed cover that is installed in this nut, this fixed cover has a fixed groove, the ccontaining and canned cycle assembly of this fixed groove.