CN2908921Y

CN2908921Y - Ball nut

Info

Publication number: CN2908921Y
Application number: CN 200620113487
Authority: CN
Inventors: 李进胜; 杨进财
Original assignee: COMTOP TECHNOLOGY Co Ltd
Current assignee: COMTOP TECHNOLOGY Co Ltd
Priority date: 2006-04-30
Filing date: 2006-04-30
Publication date: 2007-06-06
Anticipated expiration: 2016-04-30

Abstract

A ball screw cap is disclosed by the utility model, which comprises a tubular body, at least a guide part and at least a cover board. Internal circumferential surface of the body is provided with thread grooves and a circulation hole is provided on the body in axial direction and external surface is provided with at least a set groove to be connected to the circulation hole, and a first open pore is provided at bottom of the set groove to be connected to the thread grooves. The guide part is closely joined to thread grooves of a ball screw and is stuck in the body. A guide incline is formed on one end of the guide part to correspond to the first open pore and used to guide balls to pass through the first open pore to go into and out of the thread grooves. The cover board is stuck in the set groove with a back flow groove to be connected to the circulation hole and the first open pore so that the circulation hole passes through the circulation groove, the first open pore and the guide incline to be connected with the thread grooves to form a continuous curved surface and balls are rolled in the ball screw cap in a circular and continuous way.

Description

A kind of 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 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.By this when ball screw and nut block timing, ball system 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, disclosed a kind of cylinder screw, this cylinder screw comprises a screw shaft and 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 a plurality of balls continue cycle rotation in spiral grooves and return pipe.Yet this class formation, be directly to 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, ball is touched to commutator, and turn to a Circulation pipe of being located at nut, ball is circulated in ball nut constantly.Also as No. 5373755 patent of U. S. Patent notification number and No. 6681651 patents, be to 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 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 the 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.

Summary of the invention

Problem to be solved in the utility model is, a kind of ball nut is provided, and uses the circulation successfully in the circulation port of ball nut of guiding ball, reduces the effect of frictional force with performance.

For reaching above-mentioned purpose, the utility model provides a kind of ball nut, and this ball nut is set in a ball screw, and the structure of a plurality of ball reflux cycle is provided, wherein ball nut is inner has a continuous thread groove in correspondence with each other with the ball screw outside, for the ball installing.Ball nut includes the body of a tubulose, at least one guide member and at least one cover plate.The inner peripheral surface of body is provided with aforesaid thread groove, and body offers a circulation port vertically, and offers at least one fixed groove in this external surface, the communication loop hole, and offer one first perforate in the fixed groove bottom, be communicated with thread groove.Guide member is the thread groove of driving fit at ball screw, and is placed in the body, and forms a guide ramp at guide member one end, and corresponding to first perforate, and the guiding ball passes in and out thread groove by first perforate.Cover plate is placed in fixed groove, and offer a back flash on the cover plate, back flash is connected in the circulation port and first perforate, makes circulation port be connected in thread groove via back flash, first perforate and guide ramp, form a continuous curve surface, continue circulating rolling in ball nut for ball.Wherein guide ramp is tangential on thread groove, so that ball can be smooth-goingly be broken away from or return to thread groove from thread groove.

Compared with prior art, effect of the present utility model is, the utilization guide member fits in the ball screw, and guide member one end forms a guide ramp, and this guide ramp is tangential on spiral grooves, so, ball is broken away from from thread groove smooth-goingly, turned to via the back flash of cover plate again and led to the circulation port of body, and formed a loop, ball can be circulated in ball nut smooth-goingly.

For making the purpose of this utility model, structure characteristics and function thereof there are further understanding, with specific embodiment the utility model are described in detail in conjunction with the accompanying drawings down, 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 cover plate different visual angles schematic representation of the present utility model;

Fig. 4 is a guide member schematic representation of the present utility model;

Fig. 5 is guide member of the present utility model, cover plate and body combination schematic representation;

Fig. 6 is a ball-recirculation track schematic representation of the present utility model.

[primary clustering symbol description]

100 ball nuts, 110 bodies

111 circulation ports, 113 fixed grooves

115 first perforates, 117 second perforates

130 guide members, 131 guide ramp

133 protrude piece 135 screws

150 cover plates, 151 back flashes

153 first ends, 155 second ends

The 3rd perforate of 157 bumps 159

161 fish eyelets, 300 ball screws

500 thread grooves, 700 balls

900 bolts

Embodiment

Below, accompanying drawings is elaborated to better embodiment of the present invention:

See also Fig. 1 and Fig. 2, be depicted as constitutional diagram of the present utility model and explosive view.As Fig. 1 and shown in Figure 2, the utility model is a kind of ball nut 100, this ball nut 100 is set in the ball screw 300, wherein has a continuous thread groove 500 in correspondence with each other in ball nut 100 inside and ball screw 300 outsides, use for a plurality of ball 700 installings wherein, wherein this ball nut 100 includes a body 110, at least one guide member 130 and at least one cover plate 150.Guide member 130 is installed in the thread groove 500 of ball nut 100 and ball screw 300 formation, and cover plate 150 is fixed in the outer surface of ball nut 100, and this cover plate 150 is corresponding to guide member 130, and utilize a bolt 900 to pass cover plate 150 and be locked on the guide member 130, in order to securing cover plate 150 and guide member 130 in ball nut 100.

Because ball nut 100 is shorter than ball screw 300, therefore, must in ball nut 100, circulative metabolism be set, ball is back and forth circulated in ball nut 100 move.Therefore, as shown in Figure 2, offer a circulation port 111 at the axial position of body 110, and offer at least one fixed groove 113 in body 110 outer surfaces, in the present embodiment, offer two fixed grooves, and offer one first perforate 115, and offer one second perforate 117 in addition in these first perforate, 115 sides in fixed groove 113 bottoms.

In addition, see also Fig. 3 A and Fig. 3 B, be depicted as cover plate different visual angles schematic representation of the present utility model.As shown in Figure 3A, cover plate 150 1 sides are offered a back flash 151, and this back flash 151 presents and approaches a right angle type, promptly by first end 153 of back flash 151 towards radial direction, and crooked gradually and make second end 155 towards axial direction.In addition, cover plate 150 is with respect to the side of fixed groove 113, and other at back flash 151, extends a bump 157, and offers the 3rd perforate 159 that runs through cover plate 150 in bump 157, and in the present embodiment, this bump 157 is a cylindric bump.Shown in Fig. 3 B, the 3rd perforate 159 is to run through cover plate 150, and at cover plate 150 outer side surfaces the 3rd perforate 159 places, offers a fish eyelet 161.

See also Fig. 4, be depicted as guide member schematic representation of the present utility model.As shown in Figure 4, this guide member 130 is an arc body, this arc body can be coincident with a helix, and place a screw flight groove, and forming a guide ramp 131 at guide member 130 1 ends, this guide ramp 131 can be tangential on helix, makes the ball 700 that operates in thread groove 500, as shown in Figure 2, can be through guide ramp 131 thus and break away from thread groove 500 smooth-goingly.And extend one at the opposite side of guide member 130 relative guide ramp 131 and protrude piece 133, this protrudes piece 133 is as location and fixing usefulness.And in protruding piece 133, offer a screw 135.With present embodiment, this protrudes piece 133 is cylindrical protrusion pieces.

See also Fig. 5, be depicted as guide member of the present utility model, cover plate and body combination schematic representation.As shown in Figure 5, the protrusion piece 133 of guide member 130 is placed in second perforate 117 of body 110, and guide ramp 131 is connected first perforate 115 in body 110, and the bump 157 of cover plate 150 also is placed in second perforate 117, and utilize bolt 900 to pass the 3rd perforate 159 of bump 157 and lock in the screw 135 that protrudes piece 133, cover plate 150 and guide member 130 are fixed on the body 110, and bolt 900 places fish eyelet 161, unlikely body 110 outer surfaces that protrude from side.

See also Fig. 6, shown in the utility model ball-recirculation track schematic representation.As shown in Figure 6, when cover plate 150 is fixed in body 110, as shown in Figure 1, first end 153 of back flash 151 is connected in first perforate 115, and second end 155 is connected the circulation port 111 in body 110, so, guide ramp 131, second perforate 117 form a continuous curve surface with circulation port 111, this continuous curve surface is connected in thread groove 500, and forms a closed curve so that ball 700 can be in this closed curve cycle rotation.When ball 700 detours thread groove 500 by thread groove 500 1 ends and moves to the other end, touch to guide ramp 131 and break away from thread groove 500, and and then turn to by back flash 151 toward circulation port 111 and move, and when ball 700 moves to circulation port 111 the other ends, similarly turn to by back flash 151 again and past guide ramp 131, and get back to thread groove 500 once more through the guiding of guide ramp 131, and so, to form a ball-recirculation mechanism.

Can reach along the tangent direction of thread groove because of guide ramp and to connect, so ball can turn round when breaking away from thread groove and returning thread groove, can not clash into very smooth-goingly.In addition, circulative metabolism is wholely to move in ball nut, sneaks in nut so can prevent foreign matter, and problems such as oil impregnate also can not take place.

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 is sheathed on a ball screw, and the structure of a plurality of ball reflux cycle is 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, comprising:

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 at 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;

At least one guide member, driving fit be at this thread groove of this ball screw, and be placed in this body, and form a guide ramp at this guide member one end, corresponding to this first perforate, passes in and out this thread groove and guide those balls by this first perforate; And

At least one cover plate, be placed in this fixed groove, and this cover plate is offered a back flash, this back flash is connected in this circulation port and this first perforate, make this circulation port be connected in this thread groove via this back flash, this first perforate and this guide ramp, form a continuous curve surface, continue circulating rolling in this ball nut for this ball.

2, ball nut according to claim 1 is characterized in that, wherein offers one second perforate in this fixed groove bottom, and this guide member is convexly equipped with one and protrudes piece, and this protrusion piece is placed in this second perforate.

3, ball nut according to claim 2 is characterized in that, wherein this cover plate extends a bump corresponding to the side of this fixed groove, and this bump is placed in this second perforate.

4, ball nut according to claim 3 is characterized in that, wherein this bump is offered one the 3rd perforate, and the 3rd perforate protrudes piece corresponding to this, and offers a screw in this protrusion piece, makes a bolt pass the 3rd perforate and is locked in this screw.

5, ball nut according to claim 1 is characterized in that, wherein this guide ramp system is tangential on this thread groove.

6, ball nut according to claim 1 is characterized in that, wherein this cover plate extends a bump corresponding to the side of this fixed groove, and this bump is placed in this fixed groove, to locate this cover plate.

7, ball nut according to claim 1 is characterized in that, wherein this guide member is convexly equipped with a protrusion piece, and this protrusion piece is placed in this body, to fix this guide member.