CN2924180Y

CN2924180Y - External circulating ball nut

Info

Publication number: CN2924180Y
Application number: CN 200620118040
Authority: CN
Inventors: 李进胜; 杨进财
Original assignee: COMTOP TECHNOLOGY Co Ltd
Current assignee: COMTOP TECHNOLOGY Co Ltd
Priority date: 2006-06-06
Filing date: 2006-06-06
Publication date: 2007-07-18
Anticipated expiration: 2016-06-06

Abstract

An external circulation ball bearing screw cap includes a pipe-type body. The internal peripheral is provided with a screw trough and the body is axially provided with a circulation hole; the external surface of the body is provided with at least one fixed trough which is communicated with the circulation hole; the bottom of the fixed trough is provided with a first opening which is communicated with the screw trough in the body; a circulation component is arranged in the fixed trough; a guide component is provided with a first circulation block and a second circulation block; the first circulation block is jointed with the second circulation block and the jointing surface between the first circulation block and the second block is provided with a channel which is communicated with the circulation hole and the opening; the guide ball bearing moves between the screw trough and the circulation hole.

Description

The outer circulation ball nut

Technical field

The utility model relates to a kind of nut structure, especially is applied to the ball screw and the nut of ball conduction, makes the ball structure improvement of mobile outer circulation ball nut in nut continuously.

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, and then can 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 line 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 ball when the thread groove of ball screw and nut moves, ball is that line contacts with thread groove, so frictional force is quite little, therefore be widely used in the accurate mobile demand.When yet ball moves along thread groove, because of the limited length of nut, so a ball recovering mechanism must be set.

Therefore, as No. 200521356 patent of TaiWan, China patent gazette publication number, disclose a kind of cylinder screw, comprising a screw shaft is sleeved in the nut component, and in the connection interface of screw shaft and nut component, form a cylinder spiral grooves, one return pipe (return pipe) is in order to connect the two ends of cylinder spiral grooves, and the two ends of this return pipe are tangential on this cylinder spiral grooves, and then spiral grooves and return pipe become a loop, makes several balls continue cycle rotation in spiral grooves and return pipe.Yet this class formation, directly utilize return pipe to be connected in spiral grooves, and the guiding ball passes in and out this return pipe by spiral grooves, but because of the continue part of spiral grooves of the two ends of return pipe, and can't really be tangential on spiral grooves, so, just cause ball when the turnover return pipe, produce noise and vibration, and running can't be very smooth and easy.

In addition, as No. 3529486 patent of U. S. Patent notification number and No. 5014568 patents, for making ball be easy to break away from the cylinder spiral grooves, utilize a commutator (deflector) to be fixed in the nut, and driving fit is on ball screw, just ball touches to commutator, and turns to toward a Circulation pipe of being located at nut, and ball is circulated in ball nut constantly.Also as No. 5373755 patent of U. S. Patent notification number and No. 6681651 patents, utilize an outside commutator (skirt deflector) to pass ball nut, and driving fit is on a ball screw, after making ball touch outside commutator, and turn to toward a Circulation pipe that is fixed in nut, ball is circulated in ball nut constantly.So just, solved running problem smoothly, but, therefore,, dust or small foreign matter have been entered in spiral grooves, caused the ball running to have some setbacks in the joint of Circulation pipe and ball nut because of Circulation pipe exposes to ball nut.On the other hand, the lubricant oil in the spiral grooves is oozed out in the external world via the joint of Circulation pipe and ball nut, and then make ball lubricated incomplete, cause problems such as easy abrasion.The aforesaid mobile problem that has some setbacks of solution ball that has been designed to, often must employ five axis processing machines, the nut body is carried out the cutting of thin portion, so that between the thread groove of Circulation pipe, reflow pipe and nut smooth-going combining arranged, promote the smooth degree of ball running, but make the procedure of nut body become comparatively complicated on the contrary.

Summary of the invention

In view of above problem, this novel main purpose is to provide a kind of outer circulation ball nut, with in order to the circulation successfully in the circulation port of ball nut and circulation port of guiding ball, reduce the effect of frictional force with performance, simplify the manufacturing process of ball nut body simultaneously.

Therefore, for achieving the above object, this novel disclosed a kind of outer circulation ball nut, be sheathed on a ball screw, and several ball reflux cycle are provided, wherein ball nut is inner has a continuous thread groove in correspondence with each other with the ball screw outside, for a little balls installings.The circulating ball nut includes the body of a tubulose in addition, and inner circumferential surface is provided with aforesaid thread groove, and body is offered a circulation port vertically, and offer at least one fixed groove in this external surface, the communication loop hole, and bottom fixed groove, offer one first perforate, be communicated with thread groove.And at least one recirculation assembly, be arranged at fixed groove, arrangement for guiding has one first loop blocks and one second loop blocks, wherein first loop blocks engages one another with second loop blocks, and the mating face of first loop blocks and this second loop blocks is formed with a channel, communication loop hole and this perforate are guided those balls and are moved between thread groove and circulation port.

Effect of the present utility model is, ball guide mechanism and ball-recirculation mechanism are incorporated in the single recirculation assembly, by recirculation assembly being separated into knockdown structure, can make the formation channel of recirculation assembly inside, and the direction of required conversion when channel cooperates ball-recirculation, and circulate smoothly.Thus, the body of ball nut does not just need to use five complicated processing, only needs three general processing just can finish cutting operation, so can quicken the processing speed of ball nut.

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 an explosive view of the present utility model;

Fig. 3 A and Fig. 3 B are for showing in the utility model the different visual angles schematic representation of first loop blocks of recirculation assembly;

Fig. 4 A and Fig. 4 B are in the utility model, the different visual angles schematic representation of second loop blocks of recirculation assembly;

Fig. 5 is the stereogram of the recirculation assembly in the utility model;

Fig. 6 is a generalized section of the present utility model;

Fig. 7 is a ball-recirculation track schematic representation of the present utility model.

Wherein, reference character

100 bodies, 110 circulation ports

121 perforates of 120 fixed grooves

122 screws, 200 recirculation assemblies

210 first loop blocks, 211 mating faces

212 first grooves, 213 embedding holes

214 perforation, 215 main protuberances

216 guide portions, 220 second loop blocks

221 mating faces, 222 second grooves

224 perforation of 223 embedding posts

225 auxiliary protuberance 230 channels

300 ball screws, 500 thread grooves

600 spiral shells, 700 balls

Embodiment

See also Fig. 1 and Fig. 2, be depicted as the utility model embodiment's constitutional diagram and explosive view.As Fig. 1 and shown in Figure 2, a kind of outer circulation ball nut of the utility model, this ball nut is sheathed on a ball screw 300, wherein has a continuous thread groove 500 in correspondence with each other with ball screw 300 outsides in ball nut is inner, use for 700 installings of several balls wherein, wherein this ball nut includes a body 100 and two recirculation assemblies 200.

As shown in Figure 2, in body 100 offer a circulation port 110 vertically, and offer two fixed grooves 120 in body 110 outer surfaces.Each fixed groove 120 bottom has a perforate 121 respectively, and the two ends of aforesaid circulation port 110 connect two fixed grooves 120 respectively.

And recirculation assembly 200 has respectively that one first loop blocks 210 and one second loop blocks, 220, the first loop blocks 210 engage one another with second loop blocks 220 is a recirculation assembly 200.Each recirculation assembly 200 places each fixed groove 120 respectively, and connects perforate 121 and circulation port 110, moves between circulation port 110 and thread groove 500 in order to the guiding ball.

Please consult Fig. 3 A, Fig. 3 B, Fig. 4 A, Fig. 4 B and shown in Figure 5 again, wherein Fig. 3 A and Fig. 3 B are the stereoscopic figure of the different visual angles of first loop blocks 210, and wherein Fig. 4 A and Fig. 4 B are the stereoscopic figure of the different visual angles of second loop blocks 220.First loop blocks 210 has a mating face 211, is formed with one first groove 212 on mating face 211, and this one first groove 212 forms a corner, respectively the dual side-edge of communicative engagement face 211.And second loop blocks 220 also has a mating face 221, is formed with one second groove 222 on it, respectively the dual side-edge of communicative engagement face 221.First loop blocks 210 engages one another with mating face 212,222 with second loop blocks 220, and first groove 212 and second groove 222 are interosculated, and 212 places form a channel 230 (with reference to shown in Figure 5) in the mating face.When recirculation assembly 200 was placed into fixed groove 120, this channel 230 just can connect circulation port 110 and perforate 121, uses for ball 700 and passes through, and circulate between circulation port 110 and thread groove 500.Because the trend of channel 230 is determined by the direction on mating face 212,222, for the trend that makes channel 230 can be tangent with thread groove 500, so that flowing of ball 700 is more smooth, therefore mating face 212,222 also is tangent with thread groove 500, so that ball 700 enters or leave thread groove 500 along tangent direction.

And be convenient to be assembled between first loop blocks 210 and second loop blocks 220 in order to make, first loop blocks 210 has several embedding holes 213, and second loop blocks 220 has several embedding posts 223 in correspondence with each other, each embedding post 223 can embed respectively in the corresponding embedding hole 213, so that first loop blocks 210 and second loop blocks 220 are combined as a whole.

Again, for recirculation assembly 200 is fixed among the fixed groove 120, fixed groove 120 bottoms have two screws 122, first loop blocks 210 and second loop blocks 220 have corresponding perforation 214,224 respectively simultaneously, use the screw 122 that screws in correspondence for screw 600 passes, provide retention force radially, so that recirculation assembly 200 is fixed in the fixed groove 120.

In addition, first loop blocks 210 has a main protuberance 215, and second loop blocks 220 also has an auxiliary protuberance 225, wherein an end of first groove 212 is corresponding to the edge of main protuberance 215, and an end of second groove 222 is also corresponding to the edge of assisting protuberance 225, with when first loop blocks 210 and second loop blocks 220 in conjunction with the time, main protuberance 215 and auxiliary protuberance 225 can engage one another, and be positioned at recirculation assembly 200 jointly, and make an end of channel 230 be positioned at the edge of main protuberance 215 corresponding to fixed groove 120 bottoms.Therefore when recirculation assembly 200 was set at fixed groove 120, main protuberance 215 and auxiliary protuberance 225 can be placed in perforate 121 jointly, recirculation assembly 200 is carried out the fixing of tangent direction and long axis direction.Simultaneously can be with an end extension body 100 inside of channel 230, so that channel 230 is connected with thread groove 500.

Referring again to shown in Figure 6, in conjunction with reference to Fig. 3 A and Fig. 3 B, can be entered in the channel 240 by thread groove 500 really in order to make ball 700 simultaneously, first loop blocks 210 has a guide portion 216, protrude in main protuberance 215, and be positioned at an end of body 100 inside corresponding to channel 230.When main protuberance 215 is placed in perforate 121 with auxiliary protuberance 225, and guide portion 216 is embedded in the thread groove 500 of ball screw 300, make when ball 700 arrives recirculation assembly 200 positions, can be guided portion 216 blocks, can not continue in thread groove 500, to advance, and be guided and enter channel 230.Otherwise, when ball 700 enters thread groove 500 by channel 230,, a side of thread groove 500 stops because being guided portion 216, it is hereby ensured that ball 700 moves towards correct direction.

Please consult shown in Figure 7ly again, in the utility model, be ball-recirculation track schematic representation.Ball 700 detours thread groove 500 by thread groove 500 1 ends and when moving to the other end, be subjected to stopping of guide portion 216 and can't continue at thread groove 500 advancing, just can enter in the channel 230 this moment, then turns to the other end via channel 230 to turn to past circulation port 110 to move.When ball 700 moves to circulation port 110 the other ends, be subjected to the guiding of guide portion 216 again, continue along thread groove 500 toward predetermined direction to move, so, to form a ball 700 circulative metabolisms.

The utility model is incorporated into ball guide mechanism and ball-recirculation mechanism in the recirculation assembly, by recirculation assembly being separated into knockdown structure, can make the formation channel of recirculation assembly inside, and the direction of required conversion when cooperating ball-recirculation, and circulate smoothly.Thus, the body of ball nut does not just need to use five complicated processing, only needs three general processing just can finish cutting operation, so can quicken the processing speed of 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 outer circulation ball nut is sheathed on a ball screw, and several ball reflux cycle are provided, and wherein this ball nut is inner has a continuous thread groove in correspondence with each other with this ball screw outside, for those balls installings, it is characterized in that, includes:

The body of one tubulose, inner circumferential surface are provided with this thread groove, and this body offers a circulation port vertically, and offer at least one fixed groove in this this external surface, are communicated with this circulation port, and offer one first perforate in this fixed groove bottom, are communicated with this thread groove; And

At least one recirculation assembly, be arranged at this fixed groove, this arrangement for guiding has one first loop blocks and one second loop blocks, wherein this first loop blocks engages one another with this second loop blocks, and the mating face of this first loop blocks and this second loop blocks is formed with a channel, be communicated with this circulation port and this perforate, guide those balls and between this thread groove and this circulation port, move.

2, outer circulation ball nut according to claim 1 is characterized in that, this first loop blocks has at least one embedding hole, and this second loop blocks has at least one embedding post, and this abaculus embeds in this embedding hole.

3, outer circulation ball nut according to claim 1, its feature in, this fixed groove bottom has two screws, and this first loop blocks and this second loop blocks have a perforation respectively, corresponding to this screw respectively, respectively this perforation is used respectively and is screwed in corresponding respectively this screw for a screw passes.

4, outer circulation ball nut according to claim 1 is characterized in that, this first loop blocks has a main protuberance, is placed in this perforate, and an end of this channel is positioned at the edge of this protuberance.

5, outer circulation ball nut according to claim 4, it is characterized in that this first loop blocks also includes a guide portion, protrude in this main protuberance, and this guide portion is embedded in the thread groove of this ball screw, guides those balls and enters or leave this channel.

6, outer circulation ball nut according to claim 4 is characterized in that, this first loop blocks has at least one embedding hole, and this second loop blocks has at least one embedding post, and this abaculus embeds in this embedding hole.

7, outer circulation ball nut according to claim 4 is characterized in that, this second loop blocks has an auxiliary protuberance, is engaged in this main protuberance.

8, outer circulation ball nut according to claim 1 is characterized in that, the mating face of this first loop blocks and this second loop blocks is tangential on this thread groove.