CN2921456Y

CN2921456Y - Ball nut and circulator thereof

Info

Publication number: CN2921456Y
Application number: CN 200620004259
Authority: CN
Inventors: 李进胜; 杨进财
Original assignee: COMTOP TECHNOLOGY Co Ltd
Current assignee: COMTOP TECHNOLOGY Co Ltd
Priority date: 2006-03-23
Filing date: 2006-03-23
Publication date: 2007-07-11
Anticipated expiration: 2016-03-23

Abstract

A ball nut and circulator thereof is provided, wherein, a circulator is fastened onto either side of the roller cap. A quadrat and a clip block are arranged protruding from the side and the tail of the circulator. The lower part of the quadrat is provided with a prick degree, and a flee slot is arranged on the circulator for the adaption to the elastic transformation, in order to facilitate the assembly of the circulator. Corresponding slots are arranged for the ball nut to be embedded into. Meanwhile, positioning slots are arranged for the ball nut to be clipped into. The clipped block prolongs along the tangent direction of the ball nut, the prolongs along the radial direction, to make the embedded block and the clipped block may fulfill the axial and radial fixation effect respectively, with no need of C-shape buckle or screw fixation circulator. Meanwhile, the circulator is fastened onto the main body of the ball nut through the embedded block and the clipped block significantly, without risk of releasing due to the loaded radial or tangent force.

Description

Ball nut and circulator thereof

Technical field

The utility model relates to a kind of inner circulation structure of ball nut, relates in particular to a kind of ball nut and circulator thereof, can assemble fast, provides simultaneously axially and fixed effect radially, and circulator positively is fixed in the ball nut.

Background technique

For can the common mode of linear transmission promptly being to utilize the ball screw nut of arranging in pairs or groups to give bolt, making nut along the moving axially of ball screw via the rotation ball screw rod, and shaft drive is converted to linear transmission.Nut is in order to reduce the friction between ball screw and the nut, reduce the abrasion and the power loss of ball screw and nut, therefore just there is the people that ball is placed between ball screw and the nut, be that the thread groove of ball screw is strengthened and can ccontaining ball, and the thread groove of nut also strengthens with ccontaining ball, form point between ball and ball screw, the nut and contact, and ball can form the relation of relative rolling with ball screw, nut.For this reason when ball screw and nut block timing, ball is equipped in the thread groove of nut and ball screw jointly, linkage structure as ball screw and nut, when ball screw rotates, ball is just along the thread groove of ball screw and move, the opposite side of ball is equipped in the thread groove of nut at this moment, therefore just drive nut moving axially along ball screw, and when the thread groove of sub-ball screw of ball and nut moves, ball is that point contacts with thread groove, so friction is quite little, therefore be widely used in the accurate mobile demand.When yet ball moves along thread groove, limited length because of nut, so a ball backflow mechanism must be set, so, two ends in the thread groove of nut are provided with a circulator, and a circulation port is set in nut, 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 to move relative to ball screw, yet this circulator all is to utilize projection to be equipped in the draw-in groove of nut, therefore, and can't effectively circulator be fixed in the draw-in groove, cause ball in circulator when mobile, make circulator produce vibration, so ball just can't successfully move to circulator from nut, otherwise also can't make ball successfully move to nut from circulator, and nut can't be moved in ball screw smooth-goingly, what is more, may cause circulator to come off and ball is dropped and lose effect.

In order to improve the problem of circulator in axial vibration, the part commercially available prod is the product of NSK company (NSKLtd.) for example, be that afterbody at ball nut extends to form a clamping block, put into a C type again and buckle and circulator is carried out urgent, 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 axial restraint, lack radially fixed effect, and clamping block has only the fixedly effect of ball nut afterbody, front end to circulator still lacks fixed effect, therefore when bearing 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 not have certain thread groove to be connected, and causes the mobile of ball to have some setbacks;

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, place scraping brushing device earlier, buckle simultaneously by the C type again scraping brushing device and circulator are suppressed the end of being fixed in ball nut, 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.

Therefore, just the someone proposes to utilize bolt to penetrate and circulator is locked from the circumferential surface of nut, prevent the vibration of circulator or come off, but viewpoint with the manufacturing process, because of the circumferential surface of bolt from nut penetrates, must radially offer through hole in the circumferential surface of nut, so must be after the axial processing of nut, with nut unload revolve turn 90 degrees after, offered this through hole again, must be how one manufacturing process, and nut is unloaded and add man-hour once more, clamping and the action of aiming at need be arranged, so consumption worker consuming time causes the lifting of manufacture cost.

Aforesaid circulator means of fixation all must for example the C type be buckled, screw etc. by the fixed block that adds, increases number of parts, and nut itself also will possess corresponding structure, makes the manufacturing procedure of nut increase, and also needs more Assembly Action during the circulator assembling.

Summary of the invention

The circulator means of fixation of prior art all must be fixed by extra fixed block, makes ball nut must increase counter structure, and Assembly Action is increased.

The purpose of this utility model is, provides a kind of ball nut and circulator to improve structure, so that circulator can firmly be fixed in the ball nut, and desire does not also need extra fastening assembly to realize when scraping brushing device also is fixed in nut.

To achieve these goals, disclosed a kind of ball nut of the utility model and circulator thereof, ball nut is sheathed on ball screw, be converted to linear straight line transmission with rotation transmission with axle, ball nut provides the structure of a plurality of ball reflux cycle, by ball reflux cycle between ball nut and ball screw, 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 aforesaid ball installing.

Circulator is located at the end of nut, and the end has the fixed groove of ccontaining circulator, and fixed groove bottom has a circulation port that runs through the nut two ends, can make ball in the ball nut inner loop by this circulation port.One side of circulator offers back flash, in order to guiding ball turnover circulation port.

In addition, circulator has an abaculus and a clamping block, and wherein abaculus is convexly set in the side of circulator, along the radially extension of nut; Clamping block is convexly set in an end of circulator, after the radially extension of nut, is extending towards the tangent direction of nut earlier.

The end face of nut forms fixed groove, and in order to ccontaining and canned cycle device, wherein the inwall of fixed groove is provided with a caulking groove, corresponding to abaculus; One end of fixed groove extends to form a location groove, corresponding to clamping block; So that abaculus is embedded in the caulking groove, can form axial fixed effect, make the loop blocks can be along axial vibration; Clamping block is inserted in the positioning groove, can form fixed effect radially, the other end that makes loop blocks can be along radially and towards the swing of the inside of ball nut, and axially all brings into play good fixed effect in radially reaching simultaneously.

Preferably, the following half side tapering that forms of abaculus, the inwall that makes abaculus can be resisted against fixed groove smoothly slides, and embeds in the caulking groove.

Preferably, the end face of loop blocks can be processed to form one and escape ditch, makes loop blocks possess the elastic deformability, but and make the abaculus elastic displacement and in contract, insert in the fixed groove in order to loop blocks.

Preferably, fixed groove can be the two-stage design, and its first half forms a taper hole, but the direct circulated piece is inserted the Lower Half of fixed groove, in order to the assembling work of loop blocks.

Effect of the present utility model is that abaculus and clamping block can be brought into play respectively axially and fixed effect radially, and stably the canned cycle device can not vibrate circulator vertically, also can radially not swing, and makes the interior circulation of ball more smooth and easy.

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 the utility model first embodiment's stereoscopic figure;

Fig. 2 is first embodiment's a exploded perspective view;

Fig. 3 is the stereoscopic figure of loop blocks among first embodiment;

Fig. 4 is the stereoscopic figure of fixed groove among first embodiment;

Fig. 5 A and Fig. 5 B are first embodiment's application schematic representation; And

Fig. 6 is the stereoscopic figure of the utility model second embodiment's loop blocks.

Wherein, reference character

100 ball screws, 110 thread grooves

300 ball nuts, 310 bodies

310a ring-type fin 311 thread grooves

313 circulation ports, 315 fixed grooves

315a caulking groove 315b positioning groove

The 315c taper hole

330 circulator 330a back flashes

331 abaculus, 332 clamping blocks

333 escape ditch

Embodiment

See also Fig. 1 and Fig. 2, constitutional diagram and exploded view for the utility model first embodiment, be a kind of ball nut 300, be sheathed on ball screw 100 excircles, reduce frictional force by ball (figure does not show) rolling between ball nut 300 and ball screw 100, to reduce transmission loss and wearing and tearing.

Ball nut 300 has the body 310 of a hollow shape, the periphery of body forms a ring-type fin 310a, circumferential surface is provided with thread groove 311 within this body 310, this thread groove 311 is spiral helicine groove, similarly, the outer surface of ball screw 100 also is provided with thread groove 110, form continuously with the thread groove 311 of ball nut 300 and in correspondence with each other, and set up a spiral helicine channel, for ball in wherein rolling, thereby reduce the frictional force when relatively rotating between ball screw 100 and the ball nut 300, therefore, when ball screw 100 rotation, ball is just along moving in the thread groove 311 of the thread groove 110 of ball screw 100 and ball nut 300, and drive ball nut 300 along the moving axially of ball screw 100, and the rotation transmission of axle is converted to linear straight line transmission.When the thread groove 311 of the relative ball nut 300 of this ball moves to the terminal of the thread groove 311 that is positioned at ball nut 300 1 sides, can ball be turned to by a circulator 330 and move to the circulation port 313 of being located at ball nut 300, make ball get back to thread groove 311 starting points of opposite side once more, and similarly get back in the thread groove 311 with circulator 330 via circulation port 313.And this circulator 330 is arranged at an end of ball nut 300, and the other end also need be provided with this circulator 330, so that ball can repeat constantly to circulate in ball nut 300 to move.Because ball is in circulation port 313 circulating refluxs of ball nut 300 inside, so this kind circulating reflux pattern just is called as interior circulation.

For circulator 330 can be fixed in the ball nut 300, establish a fixed groove 315 in the terminal of the thread groove 311 of ball nut 300, this fixed groove 315 is positioned at the end of ball nut 300, and presents open state.This fixed groove 315 is used for ccontaining this circulator 330, and circulation port 313 is located at the bottom of this fixed groove 315, and this circulation port 313 runs through this ball nut 300, makes ball carry out interior circulation in this circulation port 313.

See also and Figure 3 shows that circulator stereogram of the present utility model, offer a back flash 330a in the circulator 330, when circulator 330 is installed in fixed groove 315, the end of this back flash 330a is with respect to the terminal of thread groove 311, and the other end of back flash 330a is corresponding to the circulation port 313 of circulator 330, so when ball moves to the terminal of thread groove 311, just through back flash 330a thus and move to circulation port 313.

When ball screw 300 rotations are passed through circulator 330 with ball, can produce axially and load radially circulator 330 respectively, circulator 330 appears along ball nut 300 vibration radially in axial load meeting, cause circulator 330 to break away from its former positions that should fix, and precision when influence ball screw 300 and operating and the ball smooth degree when moving.And load radially then can make circulator 330 rock with the end that thread groove 311,110 is connected, make ball can't be smoothly back flash 330a by circulator 330, also can influence the circulation of the ball smooth degree when mobile.

For this reason, the utility model first embodiment is convexly equipped with an abaculus 331 at axially and radially fixing in the side of circulator 330, in an end of circulator 330 afterbodys, is convexly equipped with a clamping block 332, respectively axial the and fixed effect radially of performance.

Please refer to shown in Figure 4ly, simultaneously in conjunction with reference to Fig. 3, abaculus 331 is convexly set in a side of circulator 330, and it is radially outstanding along this ball nut 300, and abaculus 331 following half side has tapering.The inwall of fixed groove 315 is corresponding to the position of abaculus 331, have a caulking groove 315a, among abaculus 331 embedding caulking groove 315a, can bring into play the axial restraint effect, make circulator 330 can bear axial load, can or not move and get loose along the radial vibration of ball nut 300.And 331 times half side taper design of abaculus can be guided abaculus 331 to slide in the inwall of fixed groove, and embed smoothly among the caulking groove 315a.

Clamping block 332 then is convexly set in an end of circulator 330, and this end is equivalent to the afterbody of circulator 330, corresponding to the circulation port 313 of ball nut 300.After wherein clamping block 332 slightly extends along the tangent direction of ball nut 300, again towards radially extending.And, then further extend to form a location groove 315b in an end of fixed groove 315, just can cooperate the type shape of clamping block 332.After clamping block 332 inserted positioning groove 315, can produce the fixed effect that radially reaches tangent direction to circulator 330, the front end of circulator 330 positively is connected with thread groove 311,110, can be and peel off towards the inside of ball nut 300 because of radially load.

Please refer to Fig. 5 A and Fig. 5 B, combination is with reference to Fig. 3 and Fig. 4 simultaneously, and fixed groove 315 can adopt the setting of two-stage, and Lower Half is in order to ccontaining and canned cycle device 330, and the first half can form the taper hole 315c of a sectional area greater than circulator 330 sectional areas.For this reason when circulator 330 is inserted fixed groove 315, because the sectional area of the first half is bigger, and present taper hole 315c type shape, therefore can smoothly circulator 330 be put into the first half of fixed groove 315, again by the guiding of taper hole 315c, the Lower Half that makes circulator 330 enter fixed groove 315 positively is fixed with fixed groove 315 driving fits.

For first abaculus 331 that makes loop blocks 330 embeds among the caulking groove 315a smoothly, the end face of loop blocks 330 is provided with one and escapes ditch 333, one side at its deflection abaculus 331 places, position, so that loop blocks 330 has possessed the ability of resiliently deformable, when abaculus 331 pressurizeds, loop blocks 330 elastically deformables, make abaculus 331 elastic displacements and in contract, shown in Fig. 5 A.For this reason, when loop blocks 330 is extruded when inserting fixed groove 315, can allow and contract in the abaculus 331, being beneficial to loop blocks 330 is placed in the fixed groove 315, when loop blocks 330 arrives the location, that is when abaculus 331 during corresponding to caulking groove 315a, loop blocks 330 can resile, abaculus 331 is embedded among the caulking groove 315a, as Fig. 5 B.This design, make loop blocks 330 easier being placed in the fixed groove 315, the loop blocks design of prior art, its clamping block does not possess tapering, also can't contract in the elasticity, when inserting fixed groove, need apply bigger strength clamping block is embedded among the caulking groove smoothly, so the utility model is more convenient in assembling.

Please consult shown in Figure 6ly again, the loop blocks 330 that is provided for the utility model second embodiment is escaped ditch 333 designs for another kind of pattern.In first embodiment, escape ditch 333 for the end face along circulator 330 cuts, make the part elastically deformable at abaculus 331 places.And in second embodiment, escape ditch 333 to be arranged with in the end face of circulator 330, present the groove kenel.These two kinds of designs can allow loop blocks 330 possess the ability of resiliently deformable, and make abaculus 331 elastic displacements and in contract, in order to circulator 330 is inserted in the fixed groove 315.Above-mentioned two kinds of structural designs all can be integrally formed in circulator by cast form, cutting or other form processing, need not install extra fixing-assembly additional.

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 and circulator thereof, be fixed in an end face of a ball nut, wherein this circulator is located at the end of this nut, this end has the fixed groove of ccontaining this circulator, this fixed groove bottom has a circulation port that runs through the two ends of this nut, one side of this circulator offers a back flash, in order to guide a plurality of balls by this circulation port, it is characterized in that:

One side of this circulator and an end are convexly equipped with an abaculus and a clamping block respectively, and the end face of this circulator forms one and escape ditch, and corresponding to this abaculus, this clamping block extends along the tangent direction of this nut earlier, again along the radially extension of this nut.

2, ball nut according to claim 1 and circulator thereof is characterized in that, a side of this abaculus forms a tapering.

3, ball nut according to claim 1 and circulator thereof is characterized in that, this is escaped ditch and is arranged with end face in this circulator.

4, ball nut according to claim 1 and circulator thereof is characterized in that, this is escaped ditch and cuts by the end face of this circulator and formed.

5, ball nut according to claim 1 and circulator thereof is characterized in that, a side of this circulator forms a cantilever, and this abaculus is located on this cantilever.

6, ball nut according to claim 1 and circulator thereof is characterized in that, this fixed groove comprises two-part, and wherein the sectional area of the first half of this fixed groove is greater than the sectional area of this circulator, and this circulator is located at the Lower Half of this fixed groove.

7, ball nut according to claim 6 and circulator thereof is characterized in that, the first half of this fixed groove is a taper hole.