CN2444706Y - Cage-type ball screw arbor - Google Patents
Cage-type ball screw arbor Download PDFInfo
- Publication number
- CN2444706Y CN2444706Y CN 00258051 CN00258051U CN2444706Y CN 2444706 Y CN2444706 Y CN 2444706Y CN 00258051 CN00258051 CN 00258051 CN 00258051 U CN00258051 U CN 00258051U CN 2444706 Y CN2444706 Y CN 2444706Y
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- China
- Prior art keywords
- ball
- aforesaid
- distance ring
- nut body
- spiral chute
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- Expired - Lifetime
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Abstract
The utility model relates to a cage type ball screw rod which comprises a screw rod shaft and a screw cap body, wherein the screw cap body is in hollow shape and the inner side of the screw cap body is provided with a spiral groove corresponding to a spiral groove of the screw rod shaft. A plurality of balls are positioned between the screw rod shaft and the spiral groove of the screw cap body. The cage type ball screw rod also comprises a ball keeping device which is arranged between the screw rod shaft and the screw cap body, wherein a plurality of keeping holes are arranged on the ball keeping device; one ball is arranged in each keeping hole. An extension body is arranged outside the ball keeping device along the spiral groove of the screw cap body; convex blocks for preventing the balls in the keeping holes from shedding outwards are arranged on the extension body at both sides of the holding holes.
Description
The utility model is about a kind of ball screw, particularly a kind of cage cover type ball distance ring that between screw axis and nut body, is provided with, adjacent ball is not in contact with one another, and keeps ball to be rolled into the still adeciduate cage shell type ball screw of scope that the nut body surrounds outward.
Traditional ball screw comprises a screw axis, the ball of nut combination and majority circulating rolling between between screw axis and nut combination; Wherein the outer surface of screw axis has the spiral chute of similar arc face, and the annex that the nut combination has a nut body and provides ball-recirculation to roll, the nut body is hollow shape, is linked in the outside of screw axis, and its inboard has and the corresponding spiral chute of the spiral chute of screw axis; Most balls is between between screw axis and nut combination, the annex that makes the ball-recirculation rolling of mat nut combination and the rolling of ball, make between the combination of screw axis and nut and rotate mutually, and no matter how long the spiral chute length of screw axis has, the nut combination spiral chute of the screw axis motion of spinning all relatively.Yet the ball screw of this design is because ball is in contact with one another in twos and rubs, so frictional resistance is bigger; And in loop structure, owing to do not contact between ball and spiral chute, and spiral chute and the power of the ball motion in the loop structure can't be provided, so the ball in loop structure is pushed by ground of a now and is advanced.Because the mutual friction of ball and pushing mutually causes the frictional resistance of ball screw to increase, the torsion when not only causing ball screw moment counter-rotating changes, and loop structure is easy to generate the problem that loop structure destroys because the load that bears is big.
Figure 10 is that (U.S. invents the 4th for a kind of improvement design of previous ball screw, 542, No. 661), Figure 11 is the A-A ' sectional view of Figure 10, be respectively equipped with spiral chute (11 and 21) on screw axis 1 and the nut body 2, nut body 2 is provided with flange 22, flange 22 be nut body and external agency in conjunction with the time a kind of design; The ball distance ring 4 that one cage cover shape (Cage) is arranged between screw axis 1 and nut body 2, and ball distance ring 4 is provided with the retaining hole of much depositing ball, deposit a ball in each retaining hole, owing to isolated by ball distance ring 4 between ball and the ball, therefore avoided the problem that rubs mutually between ball and ball; But since retainer 4 and can't limit ball leave screw axis spiral chute 11 the surface and outwards drop, therefore except the scope that the spiral chute 21 at the nut body surrounds, ball can come off by self-sustaining device 4 laterally.The design of Figure 10 respectively is provided with the periphery that a sleeve pipe 5 is enclosed in ball 3 in the both sides of nut body 2, drops to avoid ball.The length of sleeve pipe is required to be half length of nut body movement travel approximately.Because sleeve pipe 5 is arranged on the nut body 2 regularly, and nut body 2 is when moving, sleeve pipe 5 also moves with work, when moving to the break point of stroke as nut body 2,5 of sleeve pipes must surpass the extreme limit of travel point, and interfere with the bearing support (not shown) generation of screw axis 1, for bearing support discord sleeve pipe 5 is interfered, distance between bearing support and extreme limit of travel point needs the length greater than sleeve pipe 5 at least, this causes under the situation of the overwhelming majority board length to be forced to need lengthening a lot, and the board fabricating cost is seriously increased.
The purpose of this utility model mainly promptly is to design the not friction mutually of a kind of adjacent ball, and the ball-recirculation structure need not be set, and the ball screw of sleeve pipe is not set in the both sides of nut body.Because ball does not rub mutually and the ball-recirculation structure need not be set, thus the danger that can reduce friction and avoid loop structure to destroy, and sleeve pipe is not set in the both sides of nut body, and then can avoid the waste of board space, reduce the board fabricating cost.In addition in order to simplify making of the present utility model, but make the sleeve pipe standardization, the utility model is more proposed the Placement of a kind of sleeve pipe and sleeve pipe, to make things convenient for the standardization of product-quality indicators.
A kind of cage shell type ball screw of the present utility model comprises a screw axis and at least one nut body; Have the spiral chute of similar arc section on the outer surface of screw axis, the nut body is the outside that hollow shape is linked in screw axis, and its inboard then has the spiral chute with the corresponding similar arc section of the spiral chute of screw axis; Most balls and can roll along spiral chute between between the spiral chute of screw axis and nut body, because ball rolls along spiral chute, make spiral motion mutually between screw axis and nut body.
For the ball in the rolling is not in contact with one another, the new ball distance ring of the utility model design is provided with retaining hole, retaining hole remains in ball wherein, because the utility model does not use sleeve pipe to remove to limit ball, so ball distance ring of the present utility model need have the adeciduate function of the ball of maintenance; The spiral fluted surface of leaving screw axis for the ball of avoiding not having nut body enclosing region outwards comes off, so the structure of ball distance ring needs through special design.
Owing to the spiral chute of nut body is a groove that helical caves in, and contacting for point and some during the contact of two balls in the groove, ball and adjacent ball are not in contact with one another near the bottom of groove, and has suitable gap therebetween, therefore the utility model utilizes this zone that extending body is set, extending body is in the both sides of ball, and extending body is provided with to the close protrusion piece of ball, is come off laterally by retaining hole with the restriction ball.
For making things convenient for the use of product, the end user can be separated together with the ball one whole cage cover type ball distance ring from screw axis, and ball can not drop in ball distance ring, inboard at ball distance ring, the spiral chute that prolongs screw axis is provided with the interior extending body similar with the extending body in the outside, use the space of the spiral goove of screw axis, can't help the inboard of ball distance ring with the restriction ball and break away from.
Because ball distance ring has various length requirement, ball distance ring design one mechanism that can make up mutually with adjacent ball distance ring of a kind of cage shell type ball screw of the present utility model then interconnects with the combination band between adjacent ball distance ring.
Be convenient further understanding feature of the present utility model and technology contents, please consult following relevant preferable reality of the present utility model in detail and drag example, however this embodiment and graphic only for explanation and with reference to usefulness, but not in order to the utility model is done any restriction.
See also the detailed description and the accompanying drawing thereof of following relevant the utility model one preferred embodiment, can further understand technology contents of the present utility model and purpose effect thereof; Relevant this embodiment's accompanying drawing is:
Fig. 1 is the schematic representation of a kind of cage shell type ball screw of the present utility model;
Fig. 2 is the B-B ' partial sectional view of Fig. 1;
Fig. 3 is the C-C ' partial sectional view of Fig. 2;
Fig. 4 is an another kind of retainer pattern schematic representation of the present utility model;
Fig. 5 cuts view for the C-C ' part of Fig. 4;
Fig. 6 is an embodiment's of a ball distance ring of the present utility model schematic representation;
Fig. 7 is the interconnective schematic representation of ball distance ring of the present utility model;
Fig. 8 is the D-D ' partial sectional view of Fig. 7;
Fig. 9 is the partial sectional view of another kind of combination of the present utility model;
Figure 10 is a kind of schematic representation of previous ball screw;
Figure 11 is the sectional view of the A-A ' of Figure 10.
As shown in Figure 1, be the schematic representation of a kind of cage shell type ball screw of the present utility model.A kind of cage shell type ball screw of the present utility model, comprise screw axis 1 and nut body 2, the spiral chute 21 of nut body 2 just in time is arranged on the outside of the spiral chute 11 of screw axis 1, spiral chute 11 and spiral chute 21 provide the track of 3 one spiral motions of ball jointly: have a tangible gap between screw axis 1 and nut body 2, be provided with the ball distance ring 4 of cage cover shape in this gap, and ball distance ring 4 is provided with the retaining hole that majority is deposited ball 3 on the tracks of ball, deposit a ball 3 in each retaining hole, owing to isolated by ball distance ring 4 between ball and the ball, therefore avoided the problem that rubs mutually between ball and ball; Interfere because sleeve pipe meeting and bearing support are set, a kind of cage shell type ball screw of the present utility model is not provided with sleeve pipe in the both sides of nut body 2, with board length lengthening and the serious shortcoming that increases of fabricating cost of avoiding previous designing institute to derive.When screw axis 1 during with the 2 relative rotations of nut body, ball 3 approximately with nut body 2 with respect to half rotating speed of screw axis 1 with respect to screw axis 1 rotation, in order to make a kind of cage shell type ball screw of the present utility model in the effective travel scope of design, nut body 2 all contacts with abundant ball, the length of ball distance ring 4 must be longer than the length of nut body 2, and the amount of its lengthening is approximately the nut body with respect to half of the shift motion of screw axis; Owing to sleeve pipe is not set in the both sides of nut body 2, and the length of ball distance ring 4 is obviously long than nut body 2, the surface of leaving the spiral chute 11 of screw axis 1 for the ball 3 of avoiding not having nut body 2 enclosing region outwards comes off, so the structure of ball distance ring 4 needs through special design.
For understanding the structure of ball distance ring 4 of the present utility model, Fig. 2 is the B-B ' sectional view of Fig. 1, and Fig. 3 then goes at the C-C ' cross section of Fig. 2 again and analyses and observe the structure of understanding ball distance ring 4 of the present utility model with convenient.Sectional view by Fig. 3 shows, ball distance ring 4 is provided with extending body 42 in spiral chute 21 enclosing region of nut body 2, owing to the spiral chute on the nut body 21 is a groove that helical caves in, therefore in the outside of ball distance ring 4, corresponding to the set extending body 42 of the recess of spiral chute 21, in screw axis 1 and nut body 2 screw togather the process of rotation mutually, can't produce and interfere with nut body 2; Extending body 42 is by the view of Fig. 2, the extending body 42 of helical arrangement is held hole 41 and cuts into many segments, ball 3 remains in the retaining hole 41 cylindraceous, and the right and left in the outside of retaining hole 41 respectively is provided with a protrusion piece 421 that extends to retaining hole 41, makes ball 3 be protruded piece 421 restrictions and can not come off from retaining hole 41.
Comprise the retaining hole 41 of protruding piece 421 for making, there is multiple making method can reach this purpose, the utility model is through researching and analysing, the making that has three kinds of production methods to be fit to this retaining hole and to protrude piece: one of method is for earlier with littler than the diameter of retaining hole and can not be cut to the drill bit that protrudes piece 421 and process a penetration hole, with an internal diameter rose reamer inboard of penetration hole is machined to and then identical with the maintenance aperture of designing, the not high production that is fit to small lot of the efficient that the method is produced; Method second be first processing one retaining hole 41 on ball distance ring 4, again in the mode of pushing or knock between two adjacent retaining holes of extending body 42 make an indent 422 (please refer to Fig. 2) thereafter, because indent 422 makes the material in retaining hole 41 outsides move to retaining hole 41 when making, protrude piece 421 and produce, the method is because each retaining hole still need be with the boring manufacturing, so be fit to small lot batch manufacture, to large batch of making, fabricating cost is still higher; Method three for ball distance ring is completed together with retaining hole with Tuo La or other precision casting modes, for conveniently stripped, the hole wall that the projecting block of the both sides of retaining hole 41 temporarily prolongs retaining hole 41 stretches out, interfere when avoiding the outside demoulding, to push to retaining hole 41 along the outward extending protrusion piece of the hole wall of retaining hole 41 in the roll extrusion mode again after finishing the demoulding, to stop that ball 3 is by outwards coming off in the retaining hole 41.
Fig. 4 is an another kind of embodiment's of the present utility model schematic representation, Fig. 5 then is the C-C ' partial sectional view of Fig. 4, the retaining hole 41 of Fig. 4, near the aperture of the inner radius (451 places among the figure) of ball distance ring 4 diameter less than ball, make ball 3 can not drop to the inboard of ball distance ring 4 by retaining hole 41 from the outside of ball distance ring, therefore the ball in this ball distance ring is when ball distance ring 4 and screw axis 1 and nut body 2 separate simultaneously, ball still can not drop in ball distance ring 4, this provides suitable convenience to the user who uses this product, makes convenient adjustment of user and assembling.Fig. 5 is the C-C ' sectional view of Fig. 4, be shown as among the figure make retaining hole 41 in the aperture of inner radius the diameter less than ball, extending body 45 in the inboard of ball distance ring 4 is provided with along spiral chute 11 depressions of screw axis 1, and the protrusion piece 451 of interior extending body 45 makes ball can't drop to the inboard of ball distance ring 4 from retaining hole 41.In this embodiment, because the outside and the inboard of retaining hole 41 can't allow that all ball 3 passes through, for ball 3 is stored in the retaining hole 41, one of method is that piece 421 is protruded in not moulding earlier, and after earlier being placed in the retaining hole 41 by the outside of retaining hole 41 ball 3, mode to push or to knock produces protrusion piece 421 in the outside of extending body 42 again.
Because the rotational travel of the needed length of ball distance ring and the length of nut body 2 and nut body is relevant, so under different service conditions, ball distance ring need have different length.When ball distance ring is produced in the machining mode, length long and be unfavorable for processing, if and ball distance ring is when producing with forging type, and is more impossible for each length all manufactures and designs one pair of mould, therefore real have a mode that can make up mutually of ball distance ring need being designed to.Fig. 6 is a kind of embodiment of the ball distance ring of a kind of cage shell type ball screw of the present utility model, the retaining hole 41 of ball distance ring 4 and extending body 42 alternately in the shape of a spiral shape be connected, one connect apertures 43 is set respectively at two ends, the setting of connect apertures 43 is also just in time on spiral, in order to be connected with adjacent ball distance ring.
Fig. 7 is two interconnective schematic representation of ball distance ring, Fig. 8 then is the D-D ' partial sectional view of Fig. 7, show one among the figure in conjunction with passing the ball distance ring 4 on the left side and the ball distance ring 4 on the right with 6, connect apertures 43 two ball distance rings (4 and 4 ') are interconnected, since in conjunction with 6 position just in time on the spiral chute position of the nut body of screw axis, in conjunction with being with 6 to protrude from the ball distance ring external diameter partly, just in time be arranged in the spiral chute 21 of nut body, and in conjunction with being with 6 to protrude from the ball distance ring internal diameter partly, just in time be arranged in the spiral chute 11 of screw axis, so the interference can not cause nut body and screw axis to rotate mutually the time.In conjunction with being with 6 to use metallic material to make usually, so that crooked plasticity to be provided.Fig. 9 shows in conjunction with the design of the another kind of 6 combinations, is provided with one at 43 of the connect apertures of two ball distance rings 4 and 4 ' and escapes groove 44 in conjunction with band, so that escape in the groove 44 in conjunction with snapping in conjunction with band with two tail ends of 6, to increase the stability of combination.
A kind of cage shell type ball screw of the present utility model is because special ball distance ring design, make ball mutually the friction and the ball-recirculation structure need not be set, and the both sides at the nut body need not be provided with sleeve pipe, so can reduce friction and not have the danger that loop structure destroys, and avoid the waste of board space, reduce the cost that board is made.Be provided with simultaneously in the interior outside of retaining hole when protruding piece and can prevent that then ball distance ring and screw axis and nut body from separating simultaneously, ball comes off in ball distance ring.In addition, with the design of ball distance ring normalization and modularization, simplify and mass production, and a kind of cage shell type ball screw fabricating cost of the present utility model is reduced, use and can be popularized on the industry but a kind of cage shell type ball screw of the present utility model is made.Therefore, the utility model not only has tangible progressive, and the utilization on industry is extremely valuable.
Claims (7)
1. cage shell type ball screw comprises at least:
One screw axis, its outer surface has spiral chute;
One nut body is linked in the outside of aforesaid screw axis; Aforesaid nut body is hollow shape, and its inboard has and the corresponding spiral chute of the spiral chute of aforementioned screw axis;
Most balls are between between the spiral chute of aforesaid screw axis and nut body; It is characterized in that,
Wherein also include, a ball distance ring is located between aforesaid screw axis and the nut body, and ball distance ring is provided with most retaining holes, storEs an aforesaid ball in each retaining hole;
And the aforesaid ball distance ring outside is provided with extending body along the spiral chute of aforesaid nut body, and the extending body of aforesaid retaining hole both sides is provided with the protrusion piece that the ball in the restriction retaining hole does not come off laterally.
2. cage shell type ball screw according to claim 1 is characterized in that wherein the both sides of aforesaid ball distance ring are provided with connect apertures.
3. cage shell type ball screw according to claim 2 is characterized in that, passes aforesaid connect apertures combination with the combination band between wherein adjacent two aforesaid ball distance rings.
4. cage shell type ball screw according to claim 1, it is characterized in that, wherein aforesaid ball distance ring inboard is provided with interior extending body along the spiral chute of aforesaid screw axis, and the interior extending body of aforesaid retaining hole both sides is provided with the protrusion piece that the ball in the restriction retaining hole does not come off to the inside.
5. cage shell type ball screw according to claim 1 is characterized in that, wherein the extending body of the aforesaid ball distance ring outside is provided with indent.
6. cage shell type ball screw according to claim 1 is characterized in that, wherein the material of aforesaid ball distance ring is copper, aluminium or its alloy.
7. cage shell type ball screw according to claim 1 is characterized in that, wherein aforesaid ball distance ring be with after the forging type moulding again through extrusion modling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00258051 CN2444706Y (en) | 2000-10-25 | 2000-10-25 | Cage-type ball screw arbor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00258051 CN2444706Y (en) | 2000-10-25 | 2000-10-25 | Cage-type ball screw arbor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2444706Y true CN2444706Y (en) | 2001-08-29 |
Family
ID=33614453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00258051 Expired - Lifetime CN2444706Y (en) | 2000-10-25 | 2000-10-25 | Cage-type ball screw arbor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2444706Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539190A (en) * | 2008-03-17 | 2009-09-23 | 全球滚珠科技股份有限公司 | Ball nut |
-
2000
- 2000-10-25 CN CN 00258051 patent/CN2444706Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539190A (en) * | 2008-03-17 | 2009-09-23 | 全球滚珠科技股份有限公司 | Ball nut |
| CN101539190B (en) * | 2008-03-17 | 2010-12-08 | 全球滚珠科技股份有限公司 | Ball nut |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20101025 Granted publication date: 20010829 |