TWI518264B - Ball screw with a coating circulation device - Google Patents

Description

Ball screw with coated reflow device

The present invention relates to a ball screw, and more particularly to a ball screw having a coated reflow device.

Referring to Fig. 1, there is shown a drawing of U.S. Patent No. 4,357,838, the entire disclosure of which is incorporated herein incorporated herein by reference in its entirety in its entirety in the the the the the the the the The groove and the return groove 111 of the spiral groove in the nut enable the ball between the screw and the nut to be continuously circulated by the guiding of the return groove 111, however, since the reflow element 11 simultaneously has the elimination of ball recirculation The function of the impact force, and the return groove 111 of the reflow element 11 is of an open design, therefore, after the reflow element 11 is mounted to the nut, although conforming to the outer diameter of the nut specified by European Industrial Standards (DIN), In actual use, it will cause noise problems and strength problems when the ball screw is running.

Referring to Fig. 2, there is shown a drawing of U.S. Patent No. 6,656,053, which is mainly to provide a ball screw having a reflow element, although the reflow element 12 is designed in a segmented manner, that is, by an inner reflow block 121 and an outer portion. The reflow block 122 is composed of a returning structure 123 in a covered structure to solve the problem of noise and strength during the operation of the ball screw. However, since the bottom surface 124 of the reflow element 12 and the bottom edge of the return passage 123 The wire 1231 is non-parallel and has an angled formation. Therefore, the structural design must be matched with a nut having a large outer diameter, which is not suitable for a special specification nut, such as a nut specified by the European Industrial Standard (DIN). Outer diameter, so the applicability is not foot.

Therefore, how to develop a ball screw with a reflow element, which can simultaneously solve the above defects is the motive for the development of the invention.

It is an object of the present invention to provide a ball screw with a coated reflow device which, in addition to solving the noise problem and strength problem when the ball screw is in operation, is more suitable for a nut having a smaller outer diameter to enhance the reflow device. applicability.

In order to achieve the foregoing object, a ball screw with a coated reflow device according to the present invention includes: a screw having an axis and an outer spiral channel spirally disposed around the axis; a cap is sleeved on the screw along the axis direction, and includes an inner spiral channel spirally disposed inside the axis, and the inner spiral channel and the outer spiral channel form a load path for accommodating a plurality of balls, and a receiving groove formed by the end surface of the nut along the axial direction; a reflow device disposed in the receiving groove along the axis direction, and having a first side end and a second side opposite to the first side end a first side disposed between the first and second side ends, a second side disposed between the first and second side ends and opposite to the first side, and a return channel, wherein the The reflow prop has a first return hole disposed at the first side end, a second return hole disposed on the second side, and a bottom edge line connecting the first return hole and the second return hole, the first end face The contour includes at least a first arc that is sequentially connected a first tangent line, a second arc segment, a second tangent line, and a third arc segment, the first arc segment being tangent to the second return hole and having a first center of curvature, the first cut The line is an outer common tangent of the first and second arc segments, the second arc segment has a second center of curvature, and the second tangent line is an outer common tangent of the second and third arc segments and is opposite to a bottom edge line of the return path Parallel, the third arc segment has a third center of curvature, and a vertical distance from the third center of curvature to the bottom edge line is equal to a vertical distance from the second center of curvature to the bottom edge line.

Preferably, the contour of the first end surface further includes a third tangent line and a a fourth arc segment, the third tangent line is connected between the third and fourth arc segments, and is an outer common tangent of the third and fourth arc segments, the fourth arc segment has a fourth center of curvature, and the The vertical distance from the center of the four curvatures to the bottom edge line is equal to the vertical distance from the center of the first curvature to the bottom edge line.

Preferably, the first arc segment has a radius of curvature greater than a radius of the second return hole.

Preferably, the vertical distance between the second tangent line and the bottom edge line of the return channel is smaller than the diameter of the second return hole of the return channel.

Preferably, the reflow device is divided into a first reflow block and a second reflow block along the direction parallel to the axis.

Preferably, the reflow device is divided into a first reflow block and a second reflow block along the direction perpendicular to the axis.

The preferred embodiments of the present invention are set forth with reference to the accompanying drawings in detail.

"Knowledge"

11‧‧‧Reflux components

111‧‧‧Reflow tank

12‧‧‧Reflux components

121‧‧‧Return block

122‧‧‧External reflow block

123‧‧‧Return

1231‧‧‧ bottom line

"this invention"

20‧‧‧ screw

21‧‧‧ axis

22‧‧‧External spiral channel

30‧‧‧ Nuts

31‧‧‧inner spiral channel

32‧‧‧ accommodating slots

40‧‧‧Reflow device

40A, 40C‧‧‧ first reflow block

40B, 40D‧‧‧ second reflow block

41‧‧‧First side

42‧‧‧ second side

43‧‧‧ first side

431‧‧‧First arc

431C‧‧‧First Curvature Center

431R‧‧‧ radius of curvature

432‧‧‧first tangent

433‧‧‧second arc

433C‧‧‧Second Curvature Center

434‧‧‧second tangent

435‧‧‧ third arc

435C‧‧ Third Center of Curvature

436‧‧‧ third tangent

437‧‧‧fourth arc

437C‧‧‧ Fourth Curvature Center

44‧‧‧ second side

45‧‧‧Return

451‧‧‧First return hole

452‧‧‧second return hole

452R‧‧‧ Radius

452D‧‧‧diameter

453‧‧‧ bottom line

H1, H2, H3, H4, H5‧‧‧ distance

91‧‧‧ balls

Figure 1 is a drawing of the prior patent of U.S. Patent 4,357,838.

Figure 2 is a drawing of the prior patent of US6561053.

Fig. 3 is a perspective view of the present invention showing a state in which the nut is partially cross-sectional.

Figure 4 is a perspective view of the present invention showing the three-dimensional state of the reflow device.

Figure 5 is a top view of the present invention showing the top view of the reflow device.

Figure 6 is a side elevational view of the present invention showing the side view of the reflow device.

Fig. 7 is a perspective exploded view of the present invention, showing a state in which the reflux device is vertically separated.

Fig. 8 is a perspective exploded view of the present invention, showing a state in which the reflux device is separated left and right.

Referring to Figures 3 to 6, a covered back is provided in an embodiment of the present invention. The ball screw of the flow device is mainly composed of a screw 20, a nut 30, and a reflow device 40, wherein the screw 20 has an axis 21 and an outer spiral spirally disposed outside the axis 21 Channel 22.

The nut 30 is sleeved on the screw 20 in the direction of the axis 21, and includes an inner spiral channel 31 spirally disposed inside the axis 21, and the inner spiral channel 31 and the outer spiral channel 22 form a A load path for accommodating a plurality of balls 91 and a receiving groove 32 opened in the direction of the axis 21 by the end surface of the nut 30.

Since the screw 20, the nut 30, and the reflow device 40 are assembled in a conventional manner, and the operation manner thereof is the same as the prior art, and is not the focus of the present invention, therefore, for the components (refer to the screw 20, The detailed structure and actuation mode of the nut 30) and the assembly method are not described in detail.

The present invention is particularly useful in that the reflow device 40 is disposed in the accommodating groove 32 along the axis 21 and has a first side end 41 and a second side end 42 opposite to the first side end 41. a first side surface 43 disposed between the first and second side ends 41, 42 and a second side surface 44 disposed between the first and second side ends 41, 42 and opposite to the first side surface 43 And a return passage 45; wherein the return passage 45 has a first return hole 451 disposed at the first side end 41, a second return hole 452 disposed on the second side 44, and a first connection The bottom edge line 453 of the return hole 451 and the second return hole 452; it should be noted that, based on the definition of the direction of FIG. 6, the bottom edge line 453 refers to the wall surface of the return channel located at the lowest point of the return channel 45; The contour of the first end surface 43 includes at least a first arc segment 431, a first tangent line 432, a second arc segment 433, a second tangent line 434, and a third arc segment 435; The first arc segment 431 is tangent to the second return hole 452 and has a first center of curvature 431C, and the first arc segment 431 has a radius of curvature 431R greater than a half of the second return hole 452. 452R; 432 for the first tangent An outer common tangent of the first and second arc segments 431, 433; the second arc segment 433 has a second center of curvature 433C; the second tangent line 434 is an outer common tangent to the second and third arc segments 433, 435 and the reflow The bottom edge line 453 of the track 45 is parallel, and the vertical distance H1 between the second tangent line 434 and the bottom edge line 453 of the return channel 45 is smaller than the diameter 452D of the second return hole 452 of the return channel 45; The arc segment 435 has a third center of curvature 435C, and the vertical distance H2 of the third center of curvature 435C to the bottom edge line 453 is equal to the vertical distance H3 of the second center of curvature 433C to the bottom edge line 453; in this embodiment The contour of the first end surface 43 further includes a third tangent line 436 and a fourth arc segment 437 which are sequentially connected, and the third tangent line 436 is connected between the third and fourth arc segments 435 and 437, and For the tangential tangent of the third and fourth arc segments 435, 437, the fourth arc segment 437 has a fourth center of curvature 437C, and the vertical distance H4 of the fourth center of curvature 437C to the bottom edge line 453 is equal to the first The vertical distance H5 of the curvature center 431C to the bottom edge line 453; in addition, as shown in FIG. 7, the reflow device 40 is Parallel to the direction of the axis 21 is divided into a first reflow block 40A and a second reflow block 40B; of course, as shown in FIG. 8, the reflow device 40 is divided into a first reflow block 40C along the direction perpendicular to the axis 21 and A second reflow block 40D.

The above description is the structure and configuration description of each main component of the embodiment of the present invention. The mode of operation and efficacy of the present invention are described below.

First, the present invention can solve the problem of noise and strength during the operation of the ball screw.

Since the return channel 45 is disposed inside the reflow device 40, the first return hole 451 disposed at the first side end 41 of the reflow device 40 and the second side 44 of the reflow device 40 are provided. Since the two return holes 452 are formed, the balls 91 are covered by a closed return passage 45, thereby solving the problem of noise and strength during the operation of the ball screw.

Second, the present invention is applicable to a nut having a small outer diameter.

Since the present invention specifically designs the first side surface 43 of the reflow device 40, that is, the first arc segment 431 is defined to be tangent to the second return hole 452, and the first tangent line 432 is The outer common tangent of the first and second arc segments 431, 433; the second arc segment 433 has a second center of curvature 433C, and the second tangent line 434 is the outer common tangent of the second and third arc segments 434, 435 and the return The bottom edge line 453 of the track 45 is parallel, the vertical distance H2 of the third curvature center 435C of the third arc segment 435 to the bottom edge line 453 is equal to the vertical distance H3 of the second curvature center 433C to the bottom edge line 453, and the like. The limitation, whereby the invention is applied to the nut 30 having a smaller outer diameter to conform to the new and old form of the nut 30, in particular to the outer diameter of the nut 30 in accordance with European Industrial Standards (DIN).

Secondly, in addition to the above-described structural limitation, the present invention particularly defines that the vertical distance H1 between the second tangent line 434 and the bottom edge line 453 of the return passage 45 is smaller than the diameter 452D of the second return hole 452 of the return passage 45. The invention is further applicable to the nut 30 having a smaller outer diameter to conform to the new and old form of the nut 30, and in particular to the outer diameter of the nut 30 in accordance with European Industrial Standards (DIN).

In summary, the present invention provides a ball screw with a coated reflow device, which not only solves the noise problem and strength problem when the ball screw is in operation, but also applies to a nut having a small outer diameter to improve the reflow. The applicability of the device, and the above-mentioned embodiments and illustrations are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the patent application of the present invention are It should be within the scope of the patent of the present invention.

40‧‧‧Reflow device

431‧‧‧First arc

431C‧‧‧First Curvature Center

431R‧‧‧ radius of curvature

432‧‧‧first tangent

433‧‧‧second arc

433C‧‧‧Second Curvature Center

434‧‧‧second tangent

435‧‧‧ third arc

435C‧‧ Third Center of Curvature

436‧‧‧ third tangent

437‧‧‧fourth arc

437C‧‧‧ Fourth Curvature Center

45‧‧‧Return

452‧‧‧second return hole

452R‧‧‧ Radius

452D‧‧‧diameter

453‧‧‧ bottom line

H1, H2, H3, H4, H5‧‧‧ distance

Claims (5)

A ball screw with a coated reflow device, comprising: a screw having an axis and an outer spiral channel spirally disposed around the axis; a nut disposed along the axis of the screw and including An inner spiral channel spirally disposed around the axis, and the inner spiral channel and the outer spiral channel form a load path for accommodating a plurality of balls, and an accommodation opened by the end face of the nut along the axis a recirculation device, disposed in the accommodating groove along the axial direction, and having a first side end, a second side end opposite to the first side end, and a first side end and a second side end a first side, a second side disposed between the first and second side ends and opposite to the first side, and a return flow, wherein the returning prop has a first return hole disposed at the first side end a second return hole disposed on the second side, and a bottom edge line connecting the first return hole and the second return hole, the first end face having at least a first arc segment sequentially contacting a first tangent line, a second arc segment, a second tangent line, and a a third arc segment, the first arc segment being tangent to the second return hole and having a first center of curvature, the first tangent being the outer common tangent of the first and second arc segments, and the second arc segment having a a second center of curvature, the second tangent is an outer common tangent of the second and third arc segments and is parallel to a bottom edge line of the return channel, the third arc segment has a third center of curvature, and the third center of curvature The vertical distance from the bottom edge line is equal to the vertical distance from the second center of curvature to the bottom edge line; wherein the vertical distance between the second tangent line and the bottom edge line of the return channel is smaller than the second return hole of the return channel diameter of. The ball screw with a coated reflow device according to claim 1, wherein the contour of the first end surface further comprises a third tangent line and a fourth arc segment which are sequentially connected, the third tangent phase Connected between the third and fourth arc segments, and is the outer common tangent of the third and fourth arc segments, the fourth arc The segment has a fourth center of curvature, and the vertical distance from the center of the fourth curvature to the bottom edge line is equal to the vertical distance from the first center of curvature to the bottom edge line. The ball screw with a coated reflow device according to claim 1, wherein the first arc segment has a radius of curvature greater than a radius of the second recirculation hole. The ball screw with a coated reflow device according to claim 1, wherein the reflow device is divided into a first reflow block and a second reflow block in a direction parallel to the axis. The ball screw with a coated reflow device according to claim 1, wherein the reflow device is divided into a first reflow block and a second reflow block along a direction perpendicular to the axis.