TWI388750B - Circulation element for ball screw - Google Patents

Description

Ball screw with reflow element

The invention is a reflow element of a linear transmission element, in particular a configuration of a reflow element and a nut of a ball screw.

Referring to the first figure, it is a configuration of a reflow element and a nut of a ball screw of the prior art. The reflow element 2 is mounted on a low lead (small lead angle) or more than two rolling Because of the limitation of the foregoing two conditions, the nut 1 of the groove 11 causes the thickness D between the rolling grooves 11 of the nut 1 to be thin, and in order to install the reflow element 2, a mounting groove is provided on the nut 1, and the mounting is performed. The contour of the groove needs to match the shape of the reflow element 2, and the outer shape of the reflow element 2 is generally rectangular as shown, so that the mounting groove having the same contour as the reflow element 2 cannot be provided on the nut 1 at all, if set As shown in the figure, the rolling groove 11 is caused to be damaged X, and the rolling element is not allowed to run on the rolling groove 11, so that the reflow element 2 cannot be mounted on the low lead (the lead angle is small) or two. The nut 1 of the rolling groove 11 above.

However, in order to improve the above-mentioned conventional problems, the reflow element is mounted on a nut having a low lead (small lead angle) or two or more rolling grooves. Japanese Patent Publication No. JP2005-233238, the nut system a reflow hole having two ends extending through the axial direction, and two reflow elements are disposed at two ends of the return hole, and the two ends of the return flow path of the reflow element are respectively connected to the spiral raceway of the nut and the screw and the return hole, and Because the spiral raceway has a small lead or a plurality of spiral raceways, the thickness of the spiral raceway is thinner. In order to smoothly install the reflow element on the nut, a part of the return passage of the reflow element is designed. On the nut, the return path provided on the nut is a curved structure, and the surface is a curved surface, so the processing is not easy, and the processing time is relatively long, and the manufacturing cost is also increased. And even if the processing is completed, it may not match the return flow path on the reflow element, and because the return flow path is a curved structure, the running of the rolling element must cause an impact with the surface of the return flow, and the return flow path is partially made of metal. The noise generated by the impact is also high, so the patented technology still cannot completely overcome the problems caused by installing the reflow element on the nut with low lead (small lead angle) or more than two rolling grooves. .

Based on the problems of the above-mentioned conventional techniques, the inventors of the present invention have succeeded in research and development, and the inventions which can achieve the object of the following inventions are finally born.

That is, the primary object of the present invention is to develop a ball screw in which a reflow element is used for a low lead (small lead angle) or two or more rolling grooves, and reduces the manufacturing cost and noise of the operation of the ball screw.

In order to achieve the above object, the present invention is a ball screw having a reflow element, comprising: a screw having a spiral rolling groove on an outer edge thereof; and a nut provided with a through hole through which the screw is threaded The inner surface of the through hole is provided with a rolling groove opposite to the rolling groove, and the rolling groove forms a load path with the rolling groove, the load path has a lead angle, and the nut is provided with an axial direction and runs through a return hole on both end faces of the nut, and a mounting groove disposed at both ends of the return hole and engaging with the rolling groove; two reflow elements are disposed in the mounting groove, and the return element is provided with a return flow, the return flow path The two ends are respectively connected to the load path and the return hole to form a circulation path; the plurality of rolling elements are disposed on the circulation path; wherein the installation groove is provided with a first bearing surface, a second bearing surface and a a sloped surface, which is approximately parallel to a lead angle of the load path, the reflow element is provided with a first abutting surface, a second abutting surface and a mating surface, the first abutting surface is supported by the first bearing The second resisting surface is supported by the face On the second bearing surface, the mating surface of the system relative to the bevel setting.

Wherein, the mating surface and the sloped surface are not in contact with each other.

The slope is located between the first bearing surface and the second bearing surface.

The mating surface is located between the first abutting surface and the second abutting surface.

The normal direction of the first bearing surface and the second bearing surface is parallel to the axial direction of the screw.

The normal direction of the first abutting surface and the second abutting surface is parallel to the axial direction of the screw.

Wherein, the cross section of the slope is U-shaped.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the description of the embodiments of the invention. By.

Referring to FIG. 2 to FIG. 6 , the present invention is a ball screw with a reflow element, comprising: a screw 3 having a spiral groove 31 on the outer edge thereof; and a nut 4 configured There is a through hole 41 through which the screw 3 is disposed. The inner surface of the through hole 41 is provided with a rolling groove 411 opposite to the rolling groove 31. The rolling groove 411 forms a load path with the rolling groove 31. Having a lead angle A, and the nut 4 is provided with a return hole 42 extending in the axial direction and extending through the end faces of the nut 4, and a mounting groove 43 disposed at both ends of the return hole 42 and engaging with the rolling groove 411; The two reflow elements 5 are disposed in the mounting groove 43. The reflow element 5 is provided with a return flow path 51. The two ends of the return flow path 51 are respectively connected to the load path and the return hole 42 to form a circulation path; the plurality of rolling elements K The mounting groove 43 is provided with a first bearing surface 431, a second bearing surface 433 and a slope 432. The slope 432 is approximately the lead angle A of the load path. In parallel, the reflow element 5 is provided with a first abutting surface 52 , a second abutting surface 54 and a mating surface 53 . The first abutting surface 52 is supported by the first bearing surface 43 , and the second abutting surface 54 is supported by the second bearing surface 433 . The mating surface 53 is disposed relative to the inclined surface 432 .

However, since the inclined surface 432 is slightly parallel to the lead angle of the load path, it is less likely to obtain good precision when the inclined surface 432 is processed. Therefore, the first resisting surface 52 of the present invention is supported by the first surface. The bearing surface 431 and the second abutting surface 54 are supported by the second bearing surface 433 to position the reflow element 5 (the normal directions of the first bearing surface 431 and the second bearing surface 433 are Since the axial direction of the screw 3 is parallel, it is easy to process at the time of processing and it is easy to obtain good precision, and the assembly precision of the reflow element 5 is also relatively improved, and the mating surface 53 and the inclined surface 432 are not in contact with each other. The inclined surface 432 is disposed approximately parallel to the lead angle of the load path, so that the mounting groove 43 of the nut 4 does not have the problem of tooth breaking, and does not cause the rigidity of the rolling groove 411 (because the rolling groove 411 There is still a certain thickness between the meat) and the reflow element 5 can be stably positioned in the mounting groove.

In order to clearly illustrate the implementation features of the present invention, the following is a description of the advantages and practical aspects of the present invention: the present invention modifies the contour of the mounting groove provided by the conventional nut so that the mounting groove is machined at a low lead ( The screw with a small lead angle or more than two rolling grooves does not have the problem of broken teeth, and the present invention can be processed by using an end mill without special processing when machining the mounting groove. In order to reduce the manufacturing cost; and the return channel of the present invention is disposed on the reflow element, the matching precision with the return hole and the load path can be improved, the rolling member can be operated more smoothly, and noise generation can be reduced.

In view of the above, the "industrial availability" of the present invention should be unquestionable. In addition, the feature technology disclosed in the embodiment of the present invention has not been seen in publications before the application, nor has it been disclosed. The use of not only has the fact that the effect is improved as described above, but also has an additional effect that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the present invention are in compliance with the patent regulations, and the application for the invention patent is filed according to law. Please give us a review and grant a patent as soon as possible.

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the scope of the invention.

Conventional knowledge

1. . . Nut

111. . . Rolling groove

2. . . Reflow element

X. . . Breakage

D. . . Thick meat

this invention

3. . . Screw

31. . . Rolling groove

4. . . Nut

41. . . Through hole

411. . . Rolling groove

42. . . Return hole

43. . . Mounting slot

431. . . First bearing surface

432. . . Bevel

433. . . Second bearing surface

5. . . Reflow element

51. . . Return channel

52. . . First resisting surface

53. . . Mating surface

54. . . Second resisting surface

K. . . Rolling element

A. . . Lead angle

The first figure is a mating diagram of a conventional technical nut and a reflow element.

The second figure is a partial cross-sectional view of the nut of the ball screw of the present invention.

The third figure is a perspective view of the nut of the present invention.

Figure 4A is a top view of the reflow element of the present invention.

The fourth B diagram is a bottom perspective view of the reflow element of the present invention.

The fifth figure is a combination view of the reflow element of the present invention mounted on a nut.

Figure 6 is a perspective view of a half section of the nut of the present invention, particularly showing the second bearing surface of the mounting groove.

4. . . Nut

41. . . Through hole

411. . . Rolling groove

42. . . Return hole

43. . . Mounting slot

431. . . First bearing surface

432. . . Bevel

433. . . Second bearing surface

Claims (5)

A ball screw with a reflow element comprises: a screw having a spiral rolling groove at an outer edge thereof; a nut having a through hole through which the screw is threaded, the inner surface of the through hole being provided The rolling groove and the rolling groove form a load path with respect to the rolling groove of the rolling groove, the load path has a lead angle, and the nut is provided with a return hole extending in an axial direction and extending through both end faces of the nut, and a mounting groove disposed at both ends of the return hole and engaging with the rolling groove; two reflow elements are disposed in the mounting groove, the reflow element is provided with a return flow, and the two ends of the return flow are respectively connected to the load path and the reflow The hole is configured to form a circulation path; the plurality of rolling elements are disposed on the circulation path; wherein the installation groove is provided with a slope, the slope is approximately parallel to a lead angle of the load path, and the reflow element is provided with a mating surface The mating surface is disposed opposite to the inclined surface; wherein the mounting groove is further provided with a first bearing surface and a second bearing surface; wherein the returning element further comprises a first abutting surface and a second abutting surface ;among them, A first bearing surface and second bearing surface normal to the direction parallel to the axial line of the screw; The normal direction of the first abutting surface and the second abutting surface is parallel to the axial direction of the screw; wherein the first abutting surface is supported by the first bearing surface, and the second abutting surface is bearing Relying on the second bearing surface. The ball screw with a reflow element according to claim 1, wherein the slope is located between the first bearing surface and the second bearing surface. The ball screw with a reflow element according to claim 1, wherein the mating surface is located between the first abutting surface and the second abutting surface. The ball screw with a reflow element according to claim 1, wherein the mating surface and the bevel are not in contact with each other. The ball screw with a reflow element according to claim 1, wherein the slope has a U-shaped cross section.