CN2921457Y

CN2921457Y - Ball nut

Info

Publication number: CN2921457Y
Application number: CN 200620012144
Authority: CN
Inventors: 李进胜; 杨进财
Original assignee: COMTOP TECHNOLOGY Co Ltd
Current assignee: COMTOP TECHNOLOGY Co Ltd
Priority date: 2006-04-18
Filing date: 2006-04-18
Publication date: 2007-07-11
Anticipated expiration: 2016-04-18

Abstract

A ball nut is screwed onto a ball screw. The terminal of the main body of the ball nut is provided with a fixation slot. A circulator is arranged inside the slot and partly protruded outside the slot. A terminal is fastened onto the terminal of the main body. The side facing to the main body is provided with a containing slot corresponding to the circulator to contain the protruding part of the circulator out of the fixation slot. When the terminal cover is fastened onto the ball nut, the fixation slot and the containing slot can be used to fasten the circulator. Therefore, the terminal cover can ensure that the circulator should not be released from the fixation slot when the balls are circulating inside the ball nut.

Description

Ball nut

Technical field

The utility model is relevant with ball nut, particularly about a kind of ball nut structure with end cap canned cycle device.

Background technique

The general linear kind of drive is bolted in a screw rod with a nut, and the rotation by screw rod drives nut along the moving axially of screw rod, and is converted to linear transmission with the rotation transmission with axle.In order to reduce the friction between ball screw and the nut, therefore just ball is placed between screw rod and the nut, form the combination of ball nut and ball screw, the rolling by ball reduces frictional force.In this, when ball screw and ball nut assembly, ball moves in the thread groove of ball nut and ball screw.For ball is circulated in ball nut, two ends in the thread groove of ball nut are provided with a circulator, and in nut, offer a circulation port, this circulation port is connected in the circulator that is arranged at the thread groove two ends, ball is moved in circulation port through circulator thus, and arriving another circulator, this ball is got back in the thread groove of nut and ball screw once more through this circulator again, continues to drive nut and moves relative to ball screw.

In the prior art, circulator all is to utilize projection to be equipped in the clamping slot of nut.But projection cooperates with clamping slot, and canned cycle device effectively still can't be provided.When therefore circulator is subjected to the collision of ball, still can produces vibration, and cause circulator displacement even damage, lose the effect of guiding ball-recirculation.

In order to improve the problem of circulator in axial vibration, the part commercially available prod utilizes a C type to buckle circulator is clamped, and has strengthened circulator in axial fixed effect.Still have its problem place yet utilize the C type to buckle: one, C type buckle because the tolerance issues in the assembling, and in fact the C type is buckled itself and also can axially be had the displacement gap, therefore only can guarantee that circulator can not come off, the C type buckle with circulator still can be along axial vibration; Two, the C type is buckled or the projection of circulator itself all has only the effect of circulator being carried out axial restraint, lack radially fixed effect, therefore when circulator bears radial load, the front end of circulator (end that is connected with thread groove) can be swung towards the inside of ball nut, and causes circulator displacement even fracture; Three, be subject to the setting that the C type is buckled, therefore scraping brushing device can only adopt the design of thin slice kenel, the C type is buckled and is pressed the end of being fixed in ball nut simultaneously, thereby more strengthened the assembling tolerance that the C type is buckled, the sealing and the cleaning effect of the scraping brushing device of this kind sheet type are not good simultaneously, can't bring into play its effect.

In Taiwan patent gazette notification number M251059 patent, disclose a kind of architecture advances of ball screw.M251059 patent case has a loop blocks, extends a lock ear in the side formation of loop blocks.And in ball nut be provided with one corresponding to the lock ear lockhole.Pass the lock ear and be locked on lockhole by a bolt, this circulator can be fixed in the ball nut.This design by lock ear canned cycle piece, when bearing high load, the possibility that may occur rupturing, and cause loop blocks to lose efficacy.

Summary of the invention

In view of above problem, the purpose of this utility model is, provides a kind of ball nut to improve structure, so that circulator can firmly be fixed in the ball nut.

To achieve these goals, the disclosed a kind of ball nut of the utility model is screwed together in ball screw, is converted to linear straight line transmission with the rotation transmission with axle.Provide the structure of several ball reflux cycle in the ball nut, by ball reflux cycle between ball nut and ball screw, to reduce frictional force and wearing and tearing.Wherein ball nut is inner has continuous thread groove in correspondence with each other with the ball screw outside, for above-mentioned ball installing.

Ball nut includes a body, a circulator and an end cap.One end of body has a fixed groove.Circulator places fixed groove, and part protrudes in outside the fixed groove.End cap is fixed in the end of ball nut, and this end cap offers a containing groove towards a side of ball nut, corresponding to circulator, and protrudes in the part of fixed groove in order to ccontaining circulator.When end cap is fixed in ball nut, and can in the lump circulator be fixed on the ball nut, so, when ball in ball nut during inner loop, the side is the continuous impact cycle device of reason not, and makes the circulator fixed groove that comes off.

In addition, offer annular slot in end cap one side, this annular slot is in order to ccontaining scraping brushing device, and the inner peripheral surface driving fit of this scraping brushing device is in ball screw, and scraped is in the foreign matter of the excircle of ball screw.

On the other hand, also can be convexly equipped with the spiral projection in the inner peripheral surface of end cap, this spiral projection driving fit is in the excircle of ball screw, and also scraped is in the foreign matter of the excircle of ball screw.

Therefore compared to the M251059 patent, circulator of the present utility model be by the formed containing space of the fixed groove of the containing groove of end cap and ball nut with the whole encirclement of circulator, its fixed effect is good, can not produce the too high problem of circulator localised load.Scraping brushing device can place the formed annular slot of end cap in addition, also can directly be convexly equipped with the spiral projection on inner peripheral surface, with the excircle of driving fit in ball screw, provides the preferable brushing effects of scraping.

Below in conjunction with the drawings and specific embodiments the utility model is described in detail, but not as to qualification of the present utility model.

Description of drawings

Fig. 1 is a constitutional diagram of the present utility model;

Fig. 2 is a decomposing schematic representation of the present utility model;

Fig. 3 is the utility model end cap and circulator annexation figure;

Fig. 4 is end cap of the present utility model, circulator and ball nut bonding state generalized section;

Fig. 5 A is that end cap of the present utility model connects the scraping brushing device schematic representation;

Fig. 5 B is another embodiment's schematic representation of end cap of the present utility model.

Wherein, reference character

100 bodies, 101 fixed grooves

130 ball screws, 150 circulators

170 balls, 190 spiral grooves

300 end caps, 310 fish eyelets

330 containing grooves, 350 annular slots

370 screws, 390 spiral projections

500 scraping brushing devices, 700 bolts

710 double-screw bolts

Embodiment

See also Fig. 1 and Fig. 2, be depicted as constitutional diagram of the present utility model and decomposing schematic representation.The utility model is a kind of ball nut structure, and the body 100 of this ball nut is sheathed on the ball screw 130.The body 100 of this ball nut is inner to has continuously in correspondence with each other spiral groove 190 with ball screw 130 outsides, rolls in wherein for ball 170.End in the body 100 of ball nut is provided with a fixed groove 101, and these fixed groove 101 bottoms have a circulation port (figure shows) that runs through the two ends of nut, use for ball 170 by and in the circulation of the two ends of body 100.

The ball nut structure does not also include a circulator 150 and an end cap 300 in addition.Circulator 150 places fixed groove 101, and part protrudes in outside the fixed groove 101.Circulator 150 is in order to guide by circulation port and constantly circulating rolling in ball nut 100 of several balls 170.

End cap 300 is fixed in the end of body, and covers circulator 150.Axially offer at least one perforation in end cap 300 along nut, can be fish eyelet 310 with present embodiment.Several bolts 700 pass each fish eyelet 310 respectively and lock in the end, end cap 300 is fixed in the end of body 100.The head end of bolt 700 is imbedded in the fish eyelet 310, so the head end of bolt 700 can't protrude from end cap 300 surfaces, to keep the smooth and attractive in appearance of end cap 300.

See also Fig. 3 and Fig. 4, be depicted as end cap of the present utility model and circulator annexation figure and end cap, circulator and ball nut bonding state generalized section.

Wherein end cap 300 is provided with a containing groove 330 toward a side of the body 100 of ball nut, and this containing groove 330 protrudes in the part of fixed groove 101 corresponding to circulator 150 in order to ccontaining circulator 150.Be fixed in the fixed groove 101 of ball nut 100 when circulator 150, and when end cap 300 also is fixed in ball nut 100, circulator 150 somes are placed in the fixed groove 101, and another partly is placed in the containing groove 330, so, circulator 150 can very firmly be immobilizated in wherein, and the impact because of ball does not come off.

See also Fig. 5 A, be depicted as end cap of the present utility model and connect a scraping brushing device schematic representation.Annular slot 350 is offered in the another side of end cap 300, in order to a ccontaining scraping brushing device 500.Scraping brushing device 500 is a ring bodies, but and the inner peripheral surface driving fit of scraping brushing device 500 in the outer peripheral surface of ball screw 130, enter in ball nut in order to prevent the foreign matter that attaches to ball screw 130 outer peripheral surfaces, and hinder the smooth degree that ball moves.End cap 300 is radially offered by at least one screw 370 so that at least one double-screw bolt 710 passes screw 370, and fixedly scraping brushing device 500 in annular slot 350.

See also Fig. 5 B, be depicted as another embodiment's schematic representation of end cap of the present utility model.This end cap 300 is a ring bodies, and is convexly equipped with spiral projection 390 in the inner peripheral surface of end cap 300, but these spiral projection 390 driving fits make this end cap 300 have the effect of scraping brushing device in the helical flute 190 of ball screw 130.

Therefore, ball nut of the present utility model can make circulator not need additionally to utilize other assembly fixing in advance again, directly by the containing groove of end cap and the formed containing space of the fixed groove institute fixing of ball nut, so, circulator just can very firmly maintain static, and the unlikely ball that influences refluxes in ball nut.

Certainly; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.

Claims

1, a kind of ball nut, this ball nut is screwed together in a ball screw, and this ball nut is inner to have continuous spiral groove in correspondence with each other with this ball screw outside, rolls in wherein for several balls, it is characterized in that this ball nut includes:

One body, an end of this body has a fixed groove;

One circulator places this fixed groove, and part protrudes in outside this fixed groove; And

One end cap is fixed in this end of this body, and this end cap is offered one and protruded in the containing groove of this fixed groove part in order to ccontaining this circulator towards a side of this end.

2, ball nut according to claim 1 is characterized in that, a side of this end cap is offered an annular slot.

3, ball nut according to claim 2 is characterized in that, also comprises a scraping brushing device, is a ring bodies, and the inner peripheral surface driving fit of this scraping brushing device is in this ball screw, and this scraping brushing device places this annular slot.

4, ball nut according to claim 3 is characterized in that, this end cap is radially offered at least one and worn double-screw bolt to fix the screw of this scraping brushing device.

5, ball nut according to claim 1 is characterized in that, this end cap is a ring bodies, and in the inner peripheral surface driving fit of this end cap in this ball screw.

6, ball nut according to claim 5 is characterized in that, the inner peripheral surface of this end cap is convexly equipped with a spiral projection, but this spiral projection driving fit is in this helical flute of this ball screw.

7, ball nut according to claim 1 is characterized in that, this end cap is axially offered the perforation that at least one wears this end cap of bolt along this nut.

8, ball nut according to claim 1 is characterized in that, this end cap is axially offered the fish eyelet that at least one wears this end cap of bolt along this nut.