CN212155685U - Non-circulation ball screw - Google Patents
Non-circulation ball screw Download PDFInfo
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- CN212155685U CN212155685U CN202020521393.1U CN202020521393U CN212155685U CN 212155685 U CN212155685 U CN 212155685U CN 202020521393 U CN202020521393 U CN 202020521393U CN 212155685 U CN212155685 U CN 212155685U
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- screw
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- rolling groove
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Abstract
The utility model discloses a non-circulation ball screw, which comprises a screw rod and a screw cap for the screw rod to pass through, wherein a rolling groove is formed between the screw cap and the screw rod, and the outer peripheral surface of the screw cap radially extends to form two through holes reaching the rolling groove, a rolling element row arranged in the rolling groove, two stop parts arranged in the rolling groove, two elastic elements and two fixing parts; each stop piece is formed by extending at the same lead angle with the rolling groove, a connecting hole is formed on each stop piece, each fixing piece penetrates through the connecting hole of each stop piece from each through hole to fix each stop piece on the rolling groove, and two elastic elements are arranged in the rolling groove and respectively abut against between one end of the rolling element row and one end of one stop piece and between the other end of the rolling element row and one end of the other stop piece; thereby achieving the effects of reducing the volume, easy processing, simple assembly, low cost, prolonging the service life of parts, improving the smooth operation and the like.
Description
Technical Field
The present invention relates to a ball screw, and more particularly to a non-circulating ball screw.
Background
The common ball screw consists of one nut, one screw penetrating the nut axially, two reflux units connected to two ends of the nut and one rolling element row comprising steel balls; a rolling groove is formed among the nut, the screw and the reflow unit for the rolling element row to be inserted into for circular rolling. However, such a ball screw structure is expensive because of many components, large volume, complicated processing, and complicated assembly, and is not preferred by customers who mainly consider cost. In addition, the ball screw does not need a return system aiming at the working environment with short actuation stroke and low precision requirement.
Therefore, the inventor developed a structure without a circulating screw, as disclosed in US1905039A and chinese CN104813058B, wherein, for example, chinese CN104813058B, a screw is axially inserted into a nut, and a rolling element row is located in a rolling groove formed by the screw and the nut, and a rod member is respectively inserted into two ends of the nut, and a spring is arranged between each rod member and one end of the rolling element row, and the spring is fixed in the nut, so that the rolling element row can roll only within a stroke margin generated when the rod member is compressed by the spring. Therefore, the rolling element row does not perform circular rolling, and the purpose of not needing to arrange a backflow unit can be achieved. Although this configuration reduces the number of components required, because the rod member is placed flat in the nut, the connection between the rod member and the spring prevents the spring from bending along the spiral formed by the rolling grooves, which would reduce the life of the spring, prevent the spring from having the desired elasticity, and cause the spring to be difficult to operate and to break. Moreover, in order to accommodate the rod element, a contact surface structure needs to be formed on the end surface of the nut in a machining mode so as to enable the rod element to bear the contact surface structure, and therefore the process is complex and production cost is increased.
SUMMERY OF THE UTILITY MODEL
In view of the above, the main purpose of the present invention is to improve the problem that the spring is easily broken when the rod element is laid flat in the prior art, and the secondary purpose is to improve the problem that the processing is complicated when the rod element is installed in the prior art;
accordingly, in order to achieve the above object, the solution of the present invention is:
a non-recirculating ball screw comprising:
a screw;
a nut for the screw to axially penetrate, a rolling groove is formed between the nut and the screw, and the rolling groove defines a spiral axis;
a rolling element row arranged in the rolling groove;
the two stop pieces are fixed in the rolling groove and extend along the spiral axis, and the Young modulus of the material of the stop pieces is between 0.1 and 210 GPa; and
two elastic elements, which are arranged in the rolling groove, wherein one end of one elastic element is abutted against one end of the rolling element row, and the other end of the elastic element is abutted against one end of a stop piece; one end of the other elastic element is abutted against the other end of the rolling element row, and the other end of the other elastic element is abutted against one end of the other stop piece.
Furthermore, the outer peripheral surface of the screw is provided with a screw thread groove which extends spirally along the axial direction of the screw; the nut has a through hole axially, a nut thread groove spirally extending along the nut axial direction is arranged on the inner peripheral surface of the through hole, and the rolling groove is formed by the screw thread groove of the screw and the nut thread groove of the nut.
Further, the cross-sectional profile of the stop member includes a singer profile, and the nut thread groove is a singer profile and is matched with and abutted against the singer profile of the cross-sectional profile of the stop member.
The stop piece is characterized by further comprising two fixing pieces, wherein two through holes reaching the rolling groove radially extend from the outer peripheral surface of the nut, a connecting hole is formed in the radial peripheral surface of the stop piece, and the fixing pieces penetrate through the through holes of the nut and are respectively arranged in the connecting holes of the stop piece in a penetrating mode so as to respectively fix the stop piece.
Further, the rolling element row is composed of a plurality of steel balls.
Further, the stopper is integrally made of plastic or metal.
Furthermore, the stop member has a connecting portion and a supporting portion, the supporting portion protrudes from one end of the connecting portion, the outer diameter of the supporting portion is smaller than that of the connecting portion, the connecting hole is located on the connecting portion, the end face of the connecting portion has a bearing surface adjacent to the supporting portion, the bearing surface is perpendicular to the tangent line of the spiral axis, and the elastic element is sleeved on the supporting portion and abuts against the bearing surface.
Furthermore, the ratio of the diameter of the cross section of the support part to the diameter of the cross section of the connecting part is between 0.6 and 0.8.
Further, the elastic element is a helical compression spring.
Further, the fixing piece is a screw; the connecting hole of the stop piece is a screw hole.
Therefore, the beneficial effects of the utility model are that: the stop parts extending along the spiral axis can enable the elastic elements to also extend along the spiral axis, so that the connection parts of the elastic elements and the stop parts are less prone to breaking, and the service life of the elastic elements can be prolonged.
Drawings
Fig. 1 is an exploded perspective view of a preferred embodiment of the present invention;
FIG. 2 is a perspective assembly view of the embodiment shown in FIG. 1;
FIG. 3 is a combined cross-sectional view of the embodiment shown in FIG. 1;
FIG. 4 is a combined cross-sectional and partially enlarged view of the embodiment of FIG. 1;
FIG. 5 is a combined cross-sectional view of the embodiment shown in FIG. 1;
fig. 6 is a plan view of a portion of the components of the embodiment shown in fig. 1.
Description of the symbols:
non-circulating ball screw 100
Screw 10
Screw thread groove 11
Through hole 21 nut thread groove 22
Through-hole 23 rolling groove 24
Rolling element array 30
Stop member 40
Arc 411 of coupling portion 41
The Gong's tooth 412 connecting hole 413
Fixing member 60
Support section diameter D coupling section diameter D.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments with reference to the attached drawings.
Referring to fig. 1 to 6, a non-circulating ball screw 100 according to a preferred embodiment of the present invention includes a screw 10, a nut 20, a rolling element row 30, two stoppers 40, two elastic elements 50 and two fixing elements 60, wherein:
referring to fig. 1, the screw 10 has a screw thread groove 11 extending spirally along the axial direction of the screw 10, in the embodiment, the screw thread groove 11 is of a singer type, but in other embodiments, the invention is not limited thereto.
Referring to fig. 1 to 3, a through hole 21 is axially formed through the nut 20, and an inner circumferential surface of the through hole 21 has a nut thread groove 22 spirally extending along the axial direction of the nut 20, in the embodiment, the nut thread groove 22 is of a singer type. The nut 20 has two through holes 23 extending radially inward to the nut thread groove 22 on its outer peripheral surface, and the screw 10 is inserted into the through hole 21 of the nut 20, so that the screw thread groove 11 of the screw 10 and the nut thread groove 22 of the nut 20 together form a rolling groove 24, and the rolling groove 24 defines a spiral axis.
Referring to fig. 1 to 5, the rolling element row 30 is composed of a plurality of steel balls 31. The rolling element row 30 is disposed in the rolling groove 24 between the screw 10 and the nut 20.
Referring to fig. 1 to 6, two stoppers 40 are disposed in the rolling groove 24 between the screw 10 and the nut 20 and respectively located at two ends of the rolling element row 30. Each stopper 40 can be made of plastic or metal integrally, and the Young modulus of the material of each stopper 40 is between 0.1 GPa and 210GPa, so that the stopper has certain structural strength and is not easy to break when stressed. Each stopper 40 and the rolling groove 24 extend at the same lead angle and extend along the spiral axis to form an arc shape, each stopper 40 has a connecting portion 41 and a supporting portion 42, the outer diameter of the connecting portion 41 is close to but smaller than the inner diameter of the rolling groove 24, the connecting portion 41 extends along the spiral axis, further, the axial direction of the connecting portion 41 and the rolling groove 24 extend at the same lead angle and form an arc shape along the spiral axis, so that the connecting portion 41 can be accommodated in the rolling groove 24, the cross-sectional profile of the connecting portion 41 after the radial cross-section is composed of an arc shape 411 and a singer tooth shape 412, the singer tooth shape 412 is matched and abutted with the singer tooth shape of the nut thread groove 22, a connecting hole 413 is formed on the radial peripheral surface of the connecting portion 41, and the connecting hole is a screw hole in this embodiment; the support portion 42 is formed by protruding from one end of the connection portion 41, the axial direction of the support portion 42 is also formed by extending at the same lead angle as the rolling groove 24 and forms an arc shape along the spiral axis, but the outer diameter of the support portion 42 is smaller than the outer diameter of the connection portion 41, the ratio of the cross-sectional diameter D of the support portion 42 after the radial cross-section to the cross-sectional diameter D of the connection portion 41 after the radial cross-section is between 0.6 and 0.8, the end face of the connection portion 41 is provided with a bearing surface 43 adjacent to the support portion 42, and the bearing surface 43 is perpendicular to the tangent line of the spiral axis formed by the rolling groove 24.
Referring to fig. 1 to 5, two elastic elements 50, each being a helical compression spring, are disposed in the rolling groove 24 between the screw 10 and the nut 20, one end of one elastic element 50 abuts against the steel balls 31 at one end of the rolling element row 30, and the other end is sleeved on the supporting portion 42 of a stopper 40 and abuts against the bearing surface 43; one end of another elastic element 50 is abutted against the steel ball 31 at the other end of the rolling element row 30, and the other end is sleeved on the supporting part 42 of another stop member 40 and is abutted against the bearing surface 43.
Referring to fig. 1 to 5, the two fixing members 60 are screws respectively inserted into the through holes 23 of the nut 20 and screwed into the connecting holes 413 of the stoppers 40, so that the fixing members 60 fix the stoppers 40 in the rolling grooves 24.
It should be noted that, in the present embodiment, each of the stoppers 40 is fixed to the rolling groove 24 by using each of the fixing members 60, for the purpose of simplifying the processing procedure of the nut 20, in other preferred embodiments, each of the stoppers 40 may also be fixed to the rolling groove 24 by gluing, welding, press fitting or concave-convex fitting, which also has the effect of simplifying the processing procedure.
Therefore, the above is a description of the components and assembly of the non-recirculating ball screw 100 according to a preferred embodiment of the present invention, and the following description is provided for its features:
first, the present invention can provide a rolling space for the rolling element row 30 by the margin generated when the elastic element 50 is compressed, and is suitable for a working environment with a short working stroke. Moreover, since the present invention does not need to assemble the conventional reflow unit, it has the advantages of few components, small size, short length, simple assembly, and low cost. Moreover, because the axial direction of the stopper 40 is formed by extending along the spiral axis, one end of the elastic element 50 can be reliably abutted against the bearing surface 43 and limited by the supporting portion 42, so that the elastic element 50 can not be deformed or bent, and the service life of the product can be prolonged, in the practical test aspect, the structure disclosed in the U.S. Pat. No. 1905039A is tested by the applicant, after more than 185,000 cycles (after the nut moves back and forth along the screw for a predetermined distance for one cycle), the elastic element has a broken condition, while after the structure of the invention is tested for more than 300,000 cycles (after the nut 20 also moves back and forth along the screw 10 for the predetermined distance for one cycle), the elastic element 50 still operates normally and the structure is not damaged, thereby, the invention can really achieve the effect of prolonging the service life, in addition, the design of fixing the stopper 40 by using the through hole 23 formed in the radial direction of the nut 20 for the fixing member 60 to penetrate, the effect of simplifying the manufacturing process of the nut 20 can also be achieved.
Furthermore, although in the above embodiment, the stopper 40 has a connecting portion 41 and a supporting portion 42 protruding from one end of the connecting portion 41. However, in practice, the stopper 40 may also be protruded from each of the two ends of the connecting portion 41 to form a supporting portion 42, so as to increase the application range. If the nut 20 is longer, a stop member 40 and two elastic elements 50 can be inserted between the rolling element rows 30 to reduce the damage rate of the elastic elements 50.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and all equivalent variations of the present invention that are within the scope of the present invention are considered by the skilled in the art.
Claims (10)
1. A non-recirculating ball screw, comprising:
a screw;
a nut for the screw to axially penetrate, a rolling groove is formed between the nut and the screw, and the rolling groove defines a spiral axis;
a rolling element row arranged in the rolling groove;
the two stop pieces are fixed in the rolling groove and extend along the spiral axis, and the Young modulus of the material of the stop pieces is between 0.1 and 210 GPa; and
two elastic elements, which are arranged in the rolling groove, wherein one end of one elastic element is abutted against one end of the rolling element row, and the other end of the elastic element is abutted against one end of a stop piece; one end of the other elastic element is abutted against the other end of the rolling element row, and the other end of the other elastic element is abutted against one end of the other stop piece.
2. The endless ball screw of claim 1, wherein: the outer peripheral surface of the screw is provided with a screw thread groove which extends spirally along the axial direction of the screw; the nut has a through hole axially, a nut thread groove spirally extending along the nut axial direction is arranged on the inner peripheral surface of the through hole, and the rolling groove is formed by the screw thread groove of the screw and the nut thread groove of the nut.
3. The endless ball screw of claim 2, wherein: the stop piece has a sectional profile including a singer-type thread form, and the nut thread groove is of the singer-type thread form and is matched with and abutted against the singer-type thread form of the sectional profile of the stop piece.
4. The endless ball screw of claim 1, wherein: the stop piece is characterized by further comprising two fixing pieces, wherein two through holes reaching the rolling groove radially extend from the outer peripheral surface of the nut, a connecting hole is formed in the radial peripheral surface of the stop piece, and the fixing pieces penetrate through the through holes of the nut and are respectively arranged in the connecting holes of the stop piece in a penetrating mode so as to respectively fix the stop piece.
5. The endless ball screw of claim 1, wherein: the rolling element row is composed of a plurality of steel balls.
6. The endless ball screw of claim 1, wherein: the stopper is integrally made of plastic or metal.
7. The endless ball screw of claim 4, wherein: the stop piece is provided with a connecting part and a supporting part, the supporting part protrudes from one end of the connecting part, the outer diameter of the supporting part is smaller than that of the connecting part, the connecting hole is positioned on the connecting part, the end face of the connecting part is provided with a bearing surface adjacent to the supporting part, the bearing surface is perpendicular to the tangent line of the spiral axis, and the elastic element is sleeved on the supporting part and abuts against the bearing surface.
8. The endless ball screw of claim 7, wherein: the ratio of the diameter of the cross section of the support part to the diameter of the cross section of the connecting part is between 0.6 and 0.8.
9. The endless ball screw of claim 1, wherein: the elastic element is a helical compression spring.
10. The endless ball screw of claim 4, wherein: the fixing piece is a screw; the connecting hole of the stop piece is a screw hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020521393.1U CN212155685U (en) | 2020-04-10 | 2020-04-10 | Non-circulation ball screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020521393.1U CN212155685U (en) | 2020-04-10 | 2020-04-10 | Non-circulation ball screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212155685U true CN212155685U (en) | 2020-12-15 |
Family
ID=73718660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020521393.1U Active CN212155685U (en) | 2020-04-10 | 2020-04-10 | Non-circulation ball screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212155685U (en) |
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2020
- 2020-04-10 CN CN202020521393.1U patent/CN212155685U/en active Active
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| GR01 | Patent grant |