CN104455274A - Ball screw with cladding type reflux device - Google Patents

Abstract

The invention discloses a ball screw with a cladding type reflux device, which comprises: the invention solves the problems of noise and strength of the ball screw during operation, and is more suitable for the screw cap with smaller outer diameter so as to improve the applicability of the reflux device.

Description

Ball screw with enclosed return device

technical field

The invention relates to a ball screw, in particular to a ball screw with a covered backflow device.

Background technique

Referring to Fig. 1, it shows the diagram of the U.S. Patent No. US4357838, which mainly provides a ball screw with a return element. The backflow groove 111 of the spiral groove in the groove and the nut enables the balls between the screw and the nut to be continuously circulated through the guidance of the backflow groove 111. However, since the backflow element 11 has the function of eliminating ball backflow The function of the impact force, and the backflow groove 111 of the backflow element 11 is an open design, therefore, after the backflow element 11 is installed on the nut, although it conforms to the outer diameter of the nut specified by the European Industrial Standard (DIN), it is in the In actual use, it will cause noise and strength problems when the ball screw is running.

Referring to Fig. 2, it shows the diagram of U.S. Patent No. US6561053, which mainly provides a ball screw with a return element, although it adopts a segmented design for the return element 12, that is, an inner return block 121 and an outer The return block 122 is formed so that the return channel 123 is in a covered structure, so as to solve the noise problem and the strength problem when the ball screw is running. The lines 1231 are non-parallel and have an included angle. Therefore, this kind of structural design must match the nuts with larger outer diameters, and it is not suitable for nuts with special specifications, such as the nuts regulated by the European Industrial Standard (DIN). Cap OD, so applicability is not enough.

Contents of the invention

The technical problem to be solved by the present invention is to provide a ball screw with a covered backflow device. In addition to solving the noise and strength problems of the ball screw during operation, it can be applied to nuts with smaller outer diameters to improve Suitability of the backflow device.

In order to solve the above problems, the present invention provides a ball screw with a covered backflow device, comprising: a screw with an axis and an external helical channel spirally arranged on the outside around the axis; a nut along the axis The direction is sleeved on the screw rod, and includes an inner helical channel that is helically arranged inside the axis around the axis, and the inner helical channel and the outer helical channel form a load path for accommodating a plurality of balls, and a load path formed by the nut An accommodating groove opened on the end surface along the axial direction; a return device is arranged in the accommodating groove along the axial direction, and has a first side end, a second side end opposite to the first side end, and a A first side between the first and two side ends, a second side disposed between the first and two side ends and opposite to the first side, and a return channel, wherein the return channel has a The first return hole on the first side, a second return hole on the second side, and a bottom edge line connecting the first return hole and the second return hole, the contour of the first end surface at least includes A first arc segment, a first tangent line, a second arc segment, a second tangent line, and a third arc segment connected in sequence, the first arc segment is tangent to the second return hole and has A first center of curvature, the first tangent is the external common tangent of the first and second arcs, the second arc has a second center of curvature, the second tangent is the external common tangent of the second and third arcs And parallel to the bottom edge line of the return channel, the third arc segment has a third center of curvature, and the vertical distance from the third center of curvature to the bottom edge line is equal to the distance from the second center of curvature to the bottom edge line vertical distance.

Preferably, the profile of the first end surface further includes a third tangent line and a fourth arc segment connected in sequence, the third tangent line is connected between the third and fourth arc segments, and is the As for the external tangents of the third and fourth arc segments, the fourth arc segment has a fourth center of curvature, and the vertical distance from the fourth center of curvature to the bottom edge line is equal to the vertical distance from the first curvature center to the bottom edge line.

Preferably, the radius of curvature of the first arc segment is larger than the radius of the second return hole.

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

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

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

The ball screw with a covered return device provided by the present invention not only solves the problem of noise and strength during the operation of the ball screw, but also can be applied to nuts with smaller outer diameters to improve the applicability of the return device. sex.

Description of drawings

FIG. 1 is a schematic diagram of the prior US4357838 patent.

FIG. 2 is a schematic diagram of the prior US6561053 patent.

Fig. 3 is a perspective view of the present invention, showing the state of a partial section of the nut.

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

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

Fig. 6 is a side view of the present invention, showing a side view of the reflow device.

Fig. 7 is a three-dimensional exploded view of the present invention, showing that the reflux device is separated up and down.

Fig. 8 is a three-dimensional exploded view of the present invention, showing that the reflux device is separated left and right.

Explanation of reference signs

11 is the return element

111 is the return tank

12 is the return element

121 is an internal return block

122 is an external return block

123 is the return channel

1231 is the bottom edge line

20 is screw

21 is axis

22 is the outer spiral groove

30 is the nut

31 is the internal spiral groove

32 is a holding tank

40 is a backflow device

40A, 40C are the first reflow block

40B, 40D are the second reflow block

41 is the first side end

42 is the second side end

43 is the first side

431 is the first arc segment

431C is the first center of curvature

431R is the radius of curvature

432 is the first tangent

433 is the second arc segment

433C is the second center of curvature

434 is the second tangent

435 is the third arc

435C is the third center of curvature

436 is the third tangent

437 is the fourth arc

437C is the fourth center of curvature

44 is the second side

45 is the return channel

451 is the first return hole

452 is the second return hole

452R is the radius

452D is the diameter

453 is the bottom edge line

H1, H2, H3, H4, H5 are distances

91 is a ball

Detailed ways

Referring to Figures 3 to 6, a ball screw with a covered backflow device provided by an embodiment of the present invention is mainly composed of a screw 20, a nut 30, and a backflow device 40, wherein:

The screw 20 has an axis 21 and an external helical channel 22 spirally disposed on the outside around the axis 21 .

The nut 30 is sheathed on the screw rod 20 along the axis 21, and includes an inner helical channel 31 spirally arranged inside around the axis 21, and the inner helical channel 31 and the outer helical channel 22 form a A load path for accommodating a plurality of balls 91 and an accommodating groove 32 defined by the end surface of the nut 30 along the direction of the axis 21 .

Since the screw rod 20, the nut 30, and the assembly method of the return device 40 are common, and its action mode is the same as the common one, it is not the key point of the present invention, so for these components (referring to the screw rod 20, the screw rod Cap 30) and the detailed structure and action mode of assembly mode are no longer described in detail.

The special feature of the present invention is:

The return device 40 is arranged in the accommodating groove 32 along the direction of the axis 21, and has a first side end 41, a second side end 42 opposite to the first side end 41, and a second side end 42 disposed on the first, A first side 43 between the two side ends 41, 42, a second side 44 disposed between the first and two side ends 41, 42 and opposite to the first side 43, and a return channel 45;

Wherein the return channel 45 has a first return hole 451 located at the first side end 41, a second return hole 452 located at the second side 44, and a connection between the first return hole 451 and the second return hole 451. The bottom edge line 453 of the return hole 452; it should be noted that, based on the direction definition in FIG.

The profile of the first end surface 43 at least includes 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 connected in sequence; The first arc 431 is tangent to the second return hole 452 and has a first center of curvature 431C, and the radius of curvature 431R of the first arc 431 is greater than the radius 452R of the second return hole 452; The line 432 is the external 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 434 is the external common tangent of the second and third arc segments 433, 435 And it is parallel to the bottom edge line 453 of the return channel 45 , 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 of the second return hole 452 of the return channel 45 452D; the third arc segment 435 has a third center of curvature 435C, and the vertical distance H2 from the third center of curvature 435C to the bottom edge line 453 is equal to the vertical distance from the second center of curvature 433C to the bottom edge line 453 H3.

In this embodiment, the profile of the first end surface 43 further includes a third tangent line 436 and a fourth arc segment 437 connected in sequence, the third tangent line 436 is connected to the third, fourth arc segment 435, 437, and is the external common 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 from the fourth center of curvature 437C to the bottom edge line 453 H4 is equal to the vertical distance H5 from the first center of curvature 431C to the bottom edge line 453; in addition, as shown in FIG. The reflow block 40B; of course, it can also be referred to as shown in FIG. 8 , the reflow device 40 is divided into a first reflow block 40C and a second reflow block 40D along the direction perpendicular to the axis 21 .

The above is the structure and configuration description of each main component of the embodiment of the present invention. As for the action mode and effect of the present invention, the following description is made.

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

Since the present invention sets the return channel 45 inside the return device 40, it has a first return hole 451 located at the first side end 41 of the return device 40, and a first return hole 451 located at the second side 44 of the return device 40. Two return holes 452, therefore, each ball 91 is covered by a closed return channel 45, so as to solve the problem of noise and strength when the ball screw is running.

Its two, the present invention can be applicable to the nut with smaller outer diameter.

Since the present invention specifically designs the outline of the first side 43 for the return device 40, that is, it is defined that the first arc segment 431 is tangent to the second return hole 452, and the first tangent line 432 is the first, The outer common tangent of the two arc sections 431, 433; the second arc section 433 has a second center of curvature 433C, and the second tangent 434 is the outer common tangent of the second and third arc sections 434, 435 and is connected to the backflow The bottom edge line 453 of the track 45 is parallel, and the vertical distance H2 from the third center of curvature 435C of the third arc segment 435 to the bottom edge line 453 is equal to the vertical distance H2 from the second center of curvature 433C to the bottom edge line 453. The restriction of distance H3 etc., thereby, makes the present invention be applicable to the nut 30 with smaller external diameter, to meet the nut 30 of new and old form, especially refers to the nut 30 that meets the specification of European Industrial Standard (DIN) outside diameter.

Secondly, in addition to the above-mentioned structural limitations, the present invention specifically defines that 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 , This makes the present invention more applicable to nuts 30 with smaller outer diameters, so as to comply with new and old types of nuts 30 , especially referring to the outer diameter of nuts 30 regulated by European Industrial Standards (DIN).

To sum up, the present invention provides a ball screw with a wrap-around return device. In addition to solving the noise and strength problems of the ball screw during operation, it is also applicable to nuts with smaller outer diameters to improve the performance of the ball screw. The applicability of the reflux device, and the above-mentioned embodiments and illustrations are only preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, all equivalent changes and modifications made according to the claims of the present invention are all It should belong to the scope covered by the patent of the present invention.

Claims (6)

1. A ball screw with a covered reflux device, characterized in that it includes: a screw rod having an axis and an external helical channel helically arranged on the outside around the axis; A nut is sheathed on the screw rod along the axis direction, and includes an inner helical channel spirally arranged inside around the axis, and the inner helical channel and the outer helical channel form a load path for accommodating a plurality of balls , and an accommodating groove opened along the axial direction by the end surface of the nut; A return device is arranged in the accommodating groove along the axial direction, and has a first side end, a second side end opposite to the first side end, and a second side end arranged between the first and second side ends A side, a second side disposed between the first and two side ends and opposite to the first side, and a return channel, wherein the return channel has a first return hole arranged at the first side end, a The second return hole provided on the second side, and a bottom edge line connecting the first return hole and the second return hole, the contour of the first end surface at least includes a first arc segment, a A first tangent line, a second arc segment, a second tangent line, and a third arc segment, the first arc segment is tangent to the second return hole and has a first center of curvature, the first tangent line is the outer common tangent of the first and second arcs, the second arc has a second center of curvature, the second tangent is the outer common tangent of the second and third arcs and is parallel to the bottom edge of the return channel , the third arc segment has a third center of curvature, and the vertical distance from the third center of curvature to the bottom edge line is equal to the vertical distance from the second center of curvature to the bottom edge line. 2. The ball screw with wrap-around return device according to claim 1, characterized in that: the contour of the first end surface further includes a third tangent line and a fourth arc segment connected in sequence, the The third tangent is connected between the third and fourth arc segments and is the external common tangent of the third and fourth arc segments, the fourth arc segment has a fourth center of curvature, and the fourth center of curvature is the bottom edge line The vertical distance of is equal to the vertical distance of the first center of curvature to the bottom edge line. 3 . The ball screw with a shrouded return device according to claim 1 , wherein the radius of curvature of the first arc segment is greater than the radius of the second return hole. 4 . 4. The ball screw with a covered return device according to claim 1, wherein 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 . 5 . The ball screw with an enclosed return device as claimed in claim 1 , wherein the return device is divided into a first return block and a second return block along a direction parallel to the axis. 6 . 6 . The ball screw with an enclosed return device as claimed in claim 1 , wherein the return device is divided into a first return block and a second return block along a direction perpendicular to the axis. 7 .