A weak impact ball reciprocating screw pair and a manufacturing method thereof

Abstract

The present application belongs to the technical field of ball screws, and discloses a weak impact ball reciprocating screw pair and a manufacturing method thereof, wherein the weak impact ball reciprocating screw pair comprises: a screw, a slider sleeve and three balls. The slider sleeve is arranged on the screw, and three balls are sandwiched between the slider sleeve and the screw. On the one hand, since the first spiral groove and the second spiral groove have the first arc transition groove and the second arc transition groove, when the slider sleeve moves from the middle of the screw along the screw to the starting point or the end point, the ball can smoothly transition between the first spiral groove and the second spiral groove, thereby effectively eliminating the rigid impact force of the slider sleeve during reversal; on the other hand, since the inner surface of the slider sleeve is provided with the first closed groove, the pit and the second closed groove uniformly distributed along the circumferential direction, when the slider sleeve moves relative to the screw and needs to be reversed, the ball can adaptively move in the first closed groove and the second closed groove, thereby further reducing the rigid impact force between the slider sleeve and the screw.

Description

Technical Field

[0001] The present application belongs to the technical field of ball screws, and in particular relates to a weak-impact reciprocating ball screw pair and a manufacturing method thereof. Background Art

[0002] The reciprocating screw pair is a mechanism that can make the slider reciprocate along the screw without changing the direction of rotation of the main shaft. It is often used to perform stable release and recovery of the rope system in the control of the aircraft rope system deployment, avoiding the vibration phenomenon at the control terminal, which affects the stability of the gripper at the far end of the rope system. Its working principle is to arrange two spiral grooves with the same pitch but opposite rotation directions on the surface of the screw, and use a transition curve to connect the two ends of the spiral grooves in different directions. Then, when the screw rotates, the side of the spiral groove will push the fork (also known as the crescent pin) placed in it to move continuously along the spiral groove and change direction at the end point, so that the slider reciprocates along the axis of the screw driven by the fork.

[0003] In the related art, the slider slideway of the ball reciprocating screw pair is linear, and the ball will rigidly hit the top of the linear slideway during the reversing process. The problem of rigid impact force under complex working conditions has not been completely solved. Summary of the invention

[0004] The embodiment of the present application provides a weak-impact ball reciprocating screw pair and a manufacturing method thereof, which can solve the technical problem in the related art that the slider has a large impact force when changing direction during the movement along the screw. The technical solution is as follows:

[0005] In the first aspect, the present application provides a weak-impact ball reciprocating screw pair, which comprises: a screw, a slider sleeve and three balls; wherein the cylindrical surface of the screw has a first spiral groove and a second spiral groove with equal pitch and opposite rotation direction, the first spiral groove and the second spiral groove have the same starting point and end point, and the first spiral groove and the second spiral groove have a first arc transition groove at the starting point, and the first spiral groove and the second spiral groove have a second arc transition groove at the end point; the slider sleeve is arranged outside the screw, and the inner wall of the slider sleeve is uniformly distributed with a first closed groove, a pit and a second closed groove along the circumferential direction; the maximum dimension of the first closed groove along the axial direction of the slider sleeve is equal to the pitch of the first spiral groove or the second spiral groove, and the maximum dimension of the second closed groove along the axial direction of the slider sleeve is equal to the pitch of the first spiral groove or the second spiral groove; the three balls are movably arranged between the slider sleeve and the screw, one of the balls is movably arranged in the pit, and the other two balls are movably arranged in the first closed groove and the second closed groove respectively.

[0006] Optionally, the cross-sections of the first spiral groove and the second spiral groove are both first circular arc shapes; the first spiral groove is formed by cutting off the lead screw material along the first spiral line by a first spatial curve including the first circular arc shape, and the second spiral groove is formed by cutting off the lead screw material along the second spiral line by a first spatial curve including the first circular arc shape; the first circular arc transition groove is formed by cutting off the lead screw material along the first circular arc transition curve by a first spatial curve including the first circular arc shape; the second circular arc transition groove is formed by cutting off the lead screw material along the second circular arc transition curve by a first spatial curve including the first circular arc shape.

[0007] Optionally, the cross-section of the pit is a second arc shape; the pit is formed by rotating a second spatial curve including the second arc shape around the radial radius of the slider sleeve to cut off the slider sleeve material; the cross-sections of the first closed groove and the second closed groove are both third arc shapes; the first closed groove is formed by a third spatial curve including the third arc shape along a first projection curve to cut off the slider sleeve material, wherein the first projection curve is a projection of the first curve on the first axial section S1 on the inner wall of the slider sleeve; the second closed groove is formed by a third spatial curve including the third arc shape along a second projection curve to cut off the slider sleeve material, wherein the second projection curve is a projection of the second curve on the second axial section S2 on the inner wall of the slider sleeve; wherein the first axial section S1 is an axial section parallel to the line connecting the center of the pit and the center of the second closed groove, and the second axial section S2 is an axial section parallel to the line connecting the center of the pit and the center of the first closed groove; the first axial section S1 and the second axial section S2 have an angle bisector S3.

[0008] Optionally, the first circular arc, the second circular arc and the third circular arc have the same shape and equal size, and are all single circular arc H1 or double circular arc H2; the first spatial curve corresponding to the first circular arc, the second spatial curve corresponding to the second circular arc and the third spatial curve corresponding to the third circular arc have the same shape and equal size.

[0009] Optionally, the first curve is a projected circle, and a diameter of the projected circle is equal to a pitch of the first spiral groove or the second spiral groove;

[0010] The second curve is a projected circle, and the diameter of the projected circle is equal to the pitch of the first spiral groove or the second spiral groove; or, the first curve is a projected ellipse, and the major axis of the projected ellipse is parallel to the axial direction of the slider sleeve, and the length of the major axis is equal to the pitch of the first spiral groove or the second spiral groove; the second curve is a projected ellipse, and the major axis of the projected ellipse is parallel to the axial direction of the slider sleeve, and the length of the major axis is equal to the pitch of the first spiral groove or the second spiral groove.

[0011] Optionally, the slider sleeve includes three half-tiles divided along the circumferential direction, the inner walls of the three half-tiles respectively have the first closed groove, the pit and the second closed groove, each of the half-tiles has a connecting flange along the circumferential edge, and the three half-tiles are detachably connected via the connecting flange.

[0012] In a second aspect, the present application further provides a method for manufacturing a weak-impact ball reciprocating screw pair. Based on the above-mentioned weak-impact ball reciprocating screw pair, the weak-impact ball reciprocating screw pair includes a screw, a slider sleeve, and three balls arranged between the screw and the slider sleeve. The manufacturing method includes the following steps:

[0013] Step 1, processing a first spiral groove, a second spiral groove, a first arc transition groove smoothly connecting the starting point of the first spiral groove and the starting point of the second spiral groove, and a second arc transition groove smoothly connecting the end point of the first spiral groove and the end point of the second spiral groove on the cylindrical outer surface of the lead screw;

[0014] Step 2, processing a first closed groove, a second closed groove and a pit on the inner surface of the slider sleeve, wherein the first closed groove, the pit and the second closed groove are evenly distributed along the circumference of the slider sleeve;

[0015] Step 3, sleeve the slider onto the lead screw, so that each of the pit, the first closed groove and the second closed groove has a ball.

[0016] Optionally, step 1 includes the following sub-steps:

[0017] Sub-step 1.1, determining the starting points of a first spiral line and a second spiral line on the outer surface of a cylinder near the first end of the lead screw, and determining the end points of the first spiral line and the second spiral line on the outer surface of a cylinder near the second end of the lead screw; wherein the first spiral line is used to form the first spiral groove, and the second spiral line is used to form the second spiral groove;

[0018] Sub-step 1.2, starting from the starting point, drawing the first spiral line and the second spiral line with opposite rotation directions and equal pitches, wherein the first spiral line and the second spiral line intersect at the end point;

[0019] Sub-step 1.3, performing arc transition processing on the first spiral line and the second spiral line at the starting point to form a first arc transition curve, and performing arc transition processing on the first spiral line and the second spiral line at the end point to form a second arc transition curve;

[0020] Sub-step 1.4, using a first space curve including a first circular arc to remove material from the lead screw along the first spiral line to form the first spiral groove, using a first space curve including a first circular arc to remove material from the lead screw along the second spiral line to form the second spiral groove, using a first space curve including a first circular arc to remove material from the lead screw along the first arc transition curve to form the first arc transition groove, using a first space curve including a first circular arc to remove material from the lead screw along the second arc transition curve to form the second arc transition groove.

[0021] Optionally, step 2 includes the following sub-steps:

[0022] Sub-step 2.1, creating a first axial section S1, a second axial section S2, and an angle bisector S3 of the first axial section S1 and the second axial section S2 on the slider sleeve;

[0023] Sub-step 2.2, draw a first curve of a projection circle on the first axial section S1, and draw a second curve of a projection circle on the second axial section S2, so that the centers of the two projection circles are located on the same cross section of the slider sleeve, and the diameter of the projection circle is equal to the pitch of the first spiral groove or the pitch of the second spiral groove, and project them onto the inner wall of the slider sleeve to form the first projection curve and the second projection curve respectively; or, draw a first curve of a projection ellipse on the first axial section S1, and draw a second curve of a projection ellipse on the second axial section S2, so that the centers of the two projection ellipses are located on the same cross section of the slider sleeve, the major axis of the projection ellipse is parallel to the axial direction of the slider sleeve, and the length of the major axis is equal to the pitch of the first spiral groove or the second spiral groove, and project them onto the inner wall of the slider sleeve to form the first projection curve and the second projection curve respectively;

[0024] Sub-step 2.3, using a third space curve to perform material removal processing on the slider sleeve along the first projection curve to form the first closed groove, and using a third space curve to perform material removal processing on the slider sleeve along the second projection curve to form a second closed groove; wherein the third space curve has the same shape and size as the first space curve;

[0025] Sub-step 2.4, drawing a second space curve on the angle bisector plane S3, so that the center of the second space curve and the centers of the two third space curves are located on the same cross section of the slider sleeve and on the inner surface of the slider sleeve, and the slider sleeve is cut by rotating the second space curve around a central axis perpendicular to the axis of the slider sleeve to form the recess; wherein the second space curve has the same shape and size as the first space curve;

[0026] Sub-step 2.5, cutting a set thickness of material from the inner surface of the slider sleeve to form a gap between the slider sleeve and the lead screw.

[0027] Optionally, step 3 includes the following sub-steps:

[0028] Sub-step 3.1, dividing the slider sleeve into three half-tiles evenly along the circumferential direction, so that the inner walls of the three half-tiles respectively have the first closed groove, the pit and the second closed groove, each half-tile is provided with a connecting flange along the circumferential edge, and a mounting hole is processed on the connecting flange;

[0029] Sub-step 3.2, place the three balls into the first closed groove, the pit and the second closed groove respectively, and make the three balls located in the first spiral groove or the second spiral groove at the same time, and removably connect the three half-washers to the screw by connecting bolts and nuts.

[0030] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0031] A weak-impact ball reciprocating screw pair comprises a screw, a slider sleeve and three balls. On the one hand, since the first spiral groove and the second spiral groove have the same starting point and end point, and the first spiral groove and the second spiral groove have a first arc transition groove at the starting point, and the first spiral groove and the second spiral groove have a second arc transition groove at the end point, when the slider sleeve moves from the middle of the lead screw along the lead screw to the end close to the starting point, the ball can smoothly transition between the first spiral groove and the second spiral groove, thereby effectively eliminating the rigid impact force of the slider sleeve during reversal; similarly, when the slider sleeve moves from the middle of the lead screw along the lead screw to the end close to the end point, the ball can also smoothly transition between the first spiral groove and the second spiral groove, thereby reducing the rigid impact force of the slider sleeve at the end close to the end point; on the other hand, since the inner surface of the slider sleeve is provided with a first closed groove, a pit and a second closed groove uniformly distributed along the circumferential direction, when the slider sleeve moves to the end point relative to the lead screw and needs to change direction, the ball in the first closed groove can move freely in the first closed groove, and similarly, the ball in the second closed groove can move freely in the second closed groove, that is, the ball can move adaptively in the first closed groove and the second closed groove, thereby further reducing the rigid impact force between the slider sleeve and the lead screw. In summary, the low-impact ball reciprocating screw pair of the present application can effectively eliminate the rigid impact force of the slider sleeve when the end of the screw is reversed, thereby making the reversing transmission smoother.

[0032] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a schematic diagram of the overall structure of a weak-impact ball reciprocating screw pair provided in an embodiment of the present application;

[0035] Figure 2 yes Figure 1 Exploded diagram of a medium-weak impact ball reciprocating screw pair;

[0036] Figure 3 yes Figure 1 A three-dimensional schematic diagram of the middle lead screw;

[0037] Figure 4 yes Figure 3 A schematic diagram of a first spiral shape, a second spiral line, a first arc transition line, and a second arc transition line on the middle lead screw;

[0038] Figure 5 It is a three-dimensional schematic diagram of an embodiment of a slider sleeve;

[0039] Figure 6 yes Figure 5 A cross-sectional view of the middle slider sleeve at the first closed groove, the pit, and the second closed groove;

[0040] Figure 7 yes Figure 5 The middle slider sleeve is used to show a partial cutaway schematic diagram of the first closed groove;

[0041] Figure 8 yes Figure 5 The middle slider sleeve is used to show a partial cutaway schematic diagram of the second closed groove;

[0042] Fig. 9 is a schematic diagram in which the first arc shape, the second arc shape and the third arc shape are single arc shapes;

[0043] Fig.10 is a schematic diagram in which the first arc shape, the second arc shape and the third arc shape are double arc shapes;

[0044] Fig.11 It is a three-dimensional schematic diagram of another embodiment of the slider sleeve.

[0045] Description of Reference Numerals

[0046] 1-screw; 101-first spiral groove; 102-second spiral groove; 103-first circular arc transition groove; 104-second circular arc transition groove; 105-first spiral line; 106-second spiral line; 107-first circular arc transition curve; 108-second circular arc transition curve; 2-slider sleeve; 201-first closed groove; 202-pit; 203-second closed groove; 204-first curve; 205-second curve; 206-half-tile; 2061-connecting flange; 3-ball; 4-first space curve; 5-second space curve; 6-third space curve; S1-first axial section; S2-second axial section; S3-angle bisector; H1-single arc; H2-double arc. DETAILED DESCRIPTION

[0047] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0048] In the present disclosure, unless otherwise stated, "inside" and "outside" refer to the "inside" and "outside" relative to the corresponding component's own outline. In addition, the terms "first", "second", etc. used in the present disclosure are to distinguish one element from another element and do not have order and importance. In the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0049] A reciprocating screw pair is a mechanism that can make the slider reciprocate along the screw without changing the direction of rotation of the main shaft. Its working principle is to arrange two spiral grooves with the same pitch but opposite rotation directions on the surface of the screw, and use a transition curve to connect the two ends of the spiral grooves of different directions. Then, when the screw rotates, the side of the spiral groove will push the fork (also known as the crescent pin) placed in it to move continuously along the spiral groove and change direction at the end point, so that the slider reciprocates along the axial direction of the screw driven by the fork.

[0050] In the related art, in order to solve the problem of rigid impact force at the reversing point of the traditional reciprocating screw pair, a ball reciprocating screw was invented. However, the slider slideway of this type of ball reciprocating screw pair is linear, and the ball will rigidly hit the top of the linear slideway during the reversing process. The rigid impact force problem under complex working conditions such as high speed and heavy load has not been completely solved.

[0051] According to the first aspect of the present application, reference Figures 1 to 11 As shown, an embodiment of the present application provides a low-impact ball reciprocating screw pair, comprising: a screw 1, a slider sleeve 2 and three balls 3.

[0052] Among them, reference Figures 1 to 4 As shown, the cylindrical surface of the lead screw 1 has a first spiral groove 101 and a second spiral groove 102 with equal pitches and opposite rotation directions, the first spiral groove 101 and the second spiral groove 102 have the same starting point and end point, and the first spiral groove 101 and the second spiral groove 102 have a first circular arc transition groove 103 at the starting point, and the first spiral groove 101 and the second spiral groove 102 have a second circular arc transition groove 104 at the end point.

[0053] refer to Figure 1 and Figure 2 As shown, the slider sleeve 2 is sleeved outside the lead screw 1 .

[0054] refer to Figures 5 to 8As shown, the inner wall of the slider sleeve 2 is evenly distributed with a first closed groove 201, a pit 202 and a second closed groove 203 along the circumferential direction; the maximum dimension of the first closed groove 201 along the axial direction of the slider sleeve 2 is equal to the pitch of the first spiral groove 101 or the second spiral groove 102, and the maximum dimension of the second closed groove 203 along the axial direction of the slider sleeve 2 is equal to the pitch of the first spiral groove 101 or the second spiral groove 102.

[0055] refer to Figure 2 As shown, three balls 3 are movably arranged between the slider sleeve 2 and the lead screw 1, one of the balls 3 is movably arranged in the pit 202, and the other two balls 3 are movably arranged in the first closed groove 201 and the second closed groove 203 respectively; the lead screw 1, the slider sleeve and the three balls 3 constitute a ball screw pair. When the lead screw 1 rotates, the slider sleeve 2 is restricted from rotating, and the slider sleeve 2 can reciprocate along the lead screw 1.

[0056] In the above embodiment, the slider sleeve 2 is sleeved on the lead screw 1, and three balls 3 are sandwiched between the slider sleeve 2 and the lead screw 1. On the one hand, since the first spiral groove 101 and the second spiral groove 102 have the same starting point and end point, and the first spiral groove 101 and the second spiral groove 102 have a first arc transition groove 103 at the starting point, and the first spiral groove 101 and the second spiral groove 102 have a second arc transition groove 104 at the end point, when the slider sleeve 2 moves from the middle of the lead screw 1 along the lead screw 1 to the end close to the starting point, the balls 3 can smoothly transition between the first spiral groove 101 and the second spiral groove 102, thereby reducing the rigid impact force of the slider sleeve 2 at the end close to the starting point of the lead screw 1; similarly, when the slider sleeve 2 moves from the middle of the lead screw 1 along the lead screw 1 to the end close to the end point, the balls 3 can also smoothly transition between the first spiral groove 101 and the second spiral groove 102. On the other hand, since the inner surface of the slider sleeve 2 is provided with the first closed groove 201, the pit 202 and the second closed groove 203 uniformly distributed along the circumferential direction, when the slider sleeve 2 moves relative to the screw 1 and needs to be reversed, the ball 3 in the first closed groove 201 can move freely in the first closed groove 201, and similarly, the ball 3 in the second closed groove 203 can move freely in the second closed groove 203, that is, the ball 3 can move adaptively in the first closed groove 201 and the second closed groove 203, thereby further reducing the rigid impact force between the slider sleeve 2 and the screw 1. In summary, the weak impact ball reciprocating screw pair of the present application can effectively eliminate the rigid impact force of the slider sleeve 2 when the end of the screw 1 is reversed, thereby making the reversing transmission smoother.

[0057] According to the embodiments of the present application, reference Figures 1 to 4As shown, the cross-sections of the first spiral groove 101 and the second spiral groove 102 are both first circular arc shapes; the first spiral groove 101 is formed by cutting off the material of the lead screw 1 along the first spiral line 105 using the first spatial curve 4 including the first circular arc shape, and the second spiral groove 102 is formed by cutting off the material of the lead screw 1 along the second spiral line 106 using the first spatial curve 4 including the first circular arc shape; the first circular arc transition groove 103 is formed by cutting off the material of the lead screw 1 along the first circular arc transition curve 107 using the first spatial curve 4 including the first circular arc shape; the second circular arc transition groove 104 is formed by cutting off the material of the lead screw 1 along the second circular arc transition curve 108 using the first spatial curve 4 including the first circular arc shape.

[0058] In this embodiment, since the ball 3 is spherical, the cross-section of the first spiral groove 101 and the cross-section of the second spiral groove 102 are both first arcs whose size is larger than the radius of the ball 3. Preferably, the size of the first space curve 4 corresponding to the first arc is slightly larger than the diameter of the ball 3, so that the ball 3 and the first spiral groove 101 or the ball 3 and the second spiral groove 102 can fit well without excessive gaps, so the slider sleeve 2 can be reversed relatively smoothly during the reciprocating motion along the screw 1, and the rigid impact force between the slider sleeve 2 and the screw 1 is effectively eliminated.

[0059] According to the embodiments of the present application, reference Figure 5 and Figure 6 As shown, the cross-section of the pit 202 is a second circular arc; the pit 202 is formed by rotating the second spatial curve 5 containing the second circular arc around the radial radius of the slider sleeve 2 to cut off the slider sleeve 2 material; preferably, the size of the second spatial curve 5 corresponding to the pit 202 is slightly larger than the diameter of the ball 3. In this case, the ball 3 will be reliably confined in the pit 202, and there will be no redundant gap in all directions, thereby being able to provide the transmission accuracy of the ball screw pair.

[0060] According to the embodiments of the present application, reference Figure 7 and Figure 8 As shown, the cross sections of the first closed groove 201 and the second closed groove 203 are both third arc shapes.

[0061] refer to Figure 7 As shown, the first closed groove 201 is formed by cutting the slider sleeve 2 material along the first projection curve including the third space curve 6 of the third arc shape, wherein the first projection curve is the projection of the first curve 204 on the first axial section S1 on the inner wall of the slider sleeve 2.

[0062] refer to Figure 8As shown, the second closed groove 203 is formed by cutting the material of the slider sleeve 2 along the second projection curve including the third space curve 6 of the third arc shape, wherein the second projection curve is the projection of the second curve 205 on the second axial section S2 on the inner wall of the slider sleeve 2.

[0063] Among them, reference Figure 6 As shown, the first axial section S1 is an axial section parallel to the line connecting the center of the pit 202 and the center of the second closed groove 203, and the second axial section S2 is an axial section parallel to the line connecting the center of the pit 202 and the center of the first closed groove 201; the first axial section S1 and the second axial section S2 have an angular bisector S3.

[0064] Since the diameters of the three balls 3 are equal, in order to simplify the processing technology and make the force of the ball screw pair more uniform, refer to Fig. 9 and Fig.10 As shown, the first arc, the second arc and the third arc have the same shape and equal size, and are all single arc H1 or double arc H2; accordingly, the first space curve 4 corresponding to the first arc, the second space curve 5 corresponding to the second arc and the third space curve 6 corresponding to the third arc have the same shape and equal size.

[0065] The characteristics of the single arc H1 raceway profile are: the grinding wheel for grinding the raceway is relatively simple to form, and it is easy to obtain higher processing accuracy.

[0066] The contact angle of the double arc H2 raceway profile can remain basically unchanged during operation, so the transmission efficiency, load-bearing capacity and axial stiffness are relatively stable. In particular, the bottom of the spiral groove does not contact the ball 3, which can accommodate a certain amount of lubricating oil and dirt, reduce wear, and is beneficial to the smoothness of the ball 3. The ratio of the curvature radius R of the thread raceway to the ball radius r has a great influence on the load-bearing capacity of the ball screw transmission, and is generally set between R / r=1.04~1.11.

[0067] According to an embodiment of the present application, referring to Figure 7 As shown, the first curve 204 is a projected circle, and the diameter of the projected circle is equal to the pitch of the first spiral groove 101 or the second spiral groove 102; Figure 8 As shown, the second curve 205 is a projected circle, and the diameter of the projected circle is equal to the pitch of the first spiral groove 101 or the second spiral groove 102;

[0068] Or, the first curve 204 is a projected ellipse (not shown in the drawings), and the major axis of the projected ellipse is parallel to the axial direction of the slider sleeve 2, and the length of the major axis is equal to the pitch of the first spiral groove 101 or the second spiral groove 102; the second curve 205 is a projected ellipse (not shown in the drawings), and the major axis of the projected ellipse is parallel to the axial direction of the slider sleeve 2, and the length of the major axis is equal to the pitch of the first spiral groove 101 or the second spiral groove 102.

[0069] It should be noted that the graphics used to project the first curve 204 or the second curve 205 are not limited to circles or ellipses, and other closed convex curve graphics are also possible, and the present application does not impose any limitation on this.

[0070] According to the embodiments of the present application, reference Fig.11 As shown, the slider sleeve 2 includes three half-shells 206 divided along the circumferential direction, and the inner walls of the three half-shells 206 are respectively provided with the first closed groove 201, the pit 202, and the second closed groove 203, and each half-shell 206 has a connecting flange 2061 along the circumferential edge, and the three half-shells 206 are detachably connected through the connecting flange 2061. In this case, when the slider sleeve 2, the screw 1 and the three balls 3 are assembled into a ball screw pair, the three half-shells 206 can be connected to form a cylindrical structure through bolts and nuts, so that the three balls 3 are wrapped on the screw 1 through the three half-shells 206. In other embodiments, the slider sleeve 2 can also be divided into two, four or other parts along the circumferential direction, and the present application does not limit this.

[0071] According to another aspect of the present application, a method for manufacturing a weak impact ball reciprocating screw pair is provided. Based on the above-mentioned weak impact ball reciprocating screw pair, the weak impact ball reciprocating screw pair includes a screw 1, a slider sleeve 2, and three balls 3 arranged between the screw 1 and the slider sleeve 2. The method for manufacturing the weak impact ball reciprocating screw pair includes the following steps:

[0072] Step 1, processing a first spiral groove 101, a second spiral groove 102, a first arc transition groove 103 smoothly connecting the starting point of the first spiral groove 101 and the starting point of the second spiral groove 102, and a second arc transition groove 104 smoothly connecting the end point of the first spiral groove 101 and the end point of the second spiral groove 102 on the cylindrical outer surface of the lead screw 1;

[0073] Step 2, processing a first closed groove 201, a second closed groove 203 and a pit 202 on the inner surface of the slider sleeve 2, wherein the first closed groove 201, the pit 202 and the second closed groove 203 are evenly distributed along the circumference of the slider sleeve 2;

[0074] Step 3, sleeve the slider sleeve 2 on the lead screw 1, so that there is a ball 3 in each of the pit 202, the first closed groove 201 and the second closed groove 203.

[0075] Furthermore, the step 1 may include the following sub-steps:

[0076] Sub-step 1.1, determining the starting point of the first helix 105 and the second helix 106 on the cylindrical outer surface near the first end of the lead screw 1, and determining the end point of the first helix 105 and the second helix 106 on the cylindrical outer surface near the second end of the lead screw 1; wherein the first helix 105 is used to form the first helical groove 101, and the second helix 106 is used to form the second helical groove 102;

[0077] Sub-step 1.2, starting from the starting point, drawing a first spiral line 105 and a second spiral line 106 with opposite directions and equal pitches, wherein the first spiral line 105 and the second spiral line 106 intersect at the end point;

[0078] Sub-step 1.3, performing arc transition processing on the first spiral line 105 and the second spiral line 106 at the starting point to form a first arc transition curve 107, and performing arc transition processing on the first spiral line 105 and the second spiral line 106 at the end point to form a second arc transition curve 108;

[0079] Sub-step 1.4, using the first space curve 4 including the first circular arc to remove material from the lead screw 1 along the first spiral line 105 to form a first spiral groove 101, using the first space curve 4 including the first circular arc to remove material from the lead screw 1 along the second spiral line 106 to form a second spiral groove 102, using the first space curve 4 including the first circular arc to remove material from the lead screw 1 along the first arc transition curve 107 to form a first arc transition groove 103, using the first space curve 4 including the first circular arc to remove material from the lead screw 1 along the second arc transition curve 108 to form a second arc transition groove 104.

[0080] Furthermore, the step 2 may include the following sub-steps:

[0081] Sub-step 2.1, creating a first axial section S1, a second axial section S2, and an angle bisector S3 of the first axial section S1 and the second axial section S2 with an included angle of 60° on the slider sleeve 2;

[0082] Sub-step 2.2, when the first curve 204 and the second curve 205 are projection circles, projection circles are drawn on the first axial section S1 and the second axial section S2 respectively, so that the centers of the two projection circles are located on the same cross section of the slider sleeve 2, and the diameters of the projection circles are equal to the pitch of the first spiral groove 101 or the pitch of the second spiral groove 102, and the projection circles are projected onto the inner wall of the slider sleeve 2 to form the first projection curve and the second projection curve respectively;

[0083] Or, when the first curve 204 and the second curve 205 are projection ellipses, projection ellipses are drawn on the first axial section S1 and the second axial section S2 respectively, so that the centers of the two projection ellipses are located on the same cross section of the slider sleeve 2, the major axis of the projection ellipse is parallel to the axial direction of the slider sleeve 2, and the length of the major axis is equal to the pitch of the first spiral groove 101 or the second spiral groove 102, and they are projected onto the inner wall of the slider sleeve 2 respectively to form a first projection curve and a second projection curve;

[0084] Sub-step 2.3, using the third space curve 6 to perform material removal processing on the slider sleeve 2 along the first projection curve to form a first closed groove 201, and using the third space curve 6 to perform material removal processing on the slider sleeve 2 along the second projection curve to form a second closed groove 203; wherein the third space curve 6 has the same shape and the same size as the first space curve 4;

[0085] Sub-step 2.4, drawing a second space curve 5 on the angle bisector plane S3, so that the center of the second space curve 5 and the centers of the two third space curves 6 are located on the same cross section of the slider sleeve 2 and on the inner surface of the slider sleeve 2, and the slider sleeve 2 is cut by rotating the second space curve 5 around the central axis perpendicular to the axis of the slider sleeve 2 to form the recess 202; wherein the second space curve 5 has the same shape and size as the first space curve 4;

[0086] Sub-step 2.5, cutting a set thickness of material from the inner surface of the slider sleeve 2 to form a gap between the slider sleeve 2 and the lead screw 1.

[0087] Furthermore, the step 3 may include the following sub-steps:

[0088] Sub-step 3.1, the slider sleeve 2 is evenly divided into three half-tiles 206 along the circumferential direction, so that the inner walls of the three half-tiles 206 respectively have the first closed groove 201, the pit 202 and the second closed groove 203, and each half-tile 206 is provided with a connecting flange 2061 along the circumferential edge, and a mounting hole is processed on the connecting flange 2061;

[0089] Sub-step 3.2, place the three balls 3 into the first closed groove 201, the pit 202 and the second closed groove 203 respectively, and make the three balls 3 located in the first spiral groove 101 or the second spiral groove 102 at the same time, and removably connect the three half-washers 206 to the screw 1 by connecting bolts and nuts.

[0090] The description of the method of the present application has been discussed in the relevant embodiments of the above-mentioned device, and the present application will not elaborate on it.

[0091] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0092] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0093] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A weak impact ball reciprocating screw pair, characterized in that: include: A lead screw (1), wherein the cylindrical surface of the lead screw (1) comprises a first spiral groove (101) and a second spiral groove (102) with equal pitches and opposite rotation directions, the first spiral groove (101) and the second spiral groove (102) have the same starting point and end point, and the first spiral groove (101) and the second spiral groove (102) have a first circular arc transition groove (103) at the starting point, and the first spiral groove (101) and the second spiral groove (102) have a second circular arc transition groove (104) at the end point; A slider sleeve (2), the slider sleeve (2) being sleeved outside the lead screw (1), the inner wall of the slider sleeve (2) being uniformly distributed along the circumference with a first closed groove (201), a pit (202) and a second closed groove (203); the maximum dimension of the first closed groove (201) along the axial direction of the slider sleeve (2) being equal to the pitch of the first spiral groove (101) or the second spiral groove (102), and the maximum dimension of the second closed groove (203) along the axial direction of the slider sleeve (2) being equal to the pitch of the first spiral groove (101) or the second spiral groove (102); and three balls (3) movably arranged between the slider sleeve (2) and the lead screw (1), wherein one of the balls (3) is movably arranged in the pit (202), and the other two balls (3) are movably arranged in the first closed groove (201) and the second closed groove (203), respectively; The cross section of the pit (202) is a second arc shape; The recess (202) is formed by cutting away the material of the slider sleeve (2) by rotating a second space curve (5) including the second circular arc around a radial radius of the slider sleeve (2); The cross-sections of the first closed groove (201) and the second closed groove (203) are both third arc-shaped; the first closed groove (201) is formed by cutting the material of the slider sleeve (2) along a first projection curve by a third spatial curve (6) including the third arc-shaped, wherein the first projection curve is a projection of the first curve (204) on the first axial section S1 on the inner wall of the slider sleeve (2); The second closed groove (203) is formed by cutting the material of the slider sleeve (2) along a second projection curve by a third space curve (6) including the third circular arc, wherein the second projection curve is a projection of the second curve (205) on the second axial section S2 on the inner wall of the slider sleeve (2); The first axial section S1 is an axial section parallel to a line connecting the center of the pit (202) and the center of the second closed groove (203), and the second axial section S2 is an axial section parallel to a line connecting the center of the pit (202) and the center of the first closed groove (201); The first axial section S1 and the second axial section S2 have an angle bisector surface S3.

2. The weak impact ball reciprocating screw pair according to claim 1, characterized in that: The cross sections of the first spiral groove (101) and the second spiral groove (102) are both first arc-shaped; The first spiral groove (101) is formed by cutting away the material of the lead screw (1) along a first spiral line (105) along a first space curve (4) including the first circular arc; the second spiral groove (102) is formed by cutting away the material of the lead screw (1) along a second spiral line (106) along a first space curve (4) including the first circular arc; the first circular arc transition groove (103) is formed by cutting away the material of the lead screw (1) along a first circular arc transition curve (107) along a first circular arc transition curve (107); and the second circular arc transition groove (104) is formed by cutting away the material of the lead screw (1) along a second circular arc transition curve (108) along a first space curve (4) including the first circular arc.

3. The weak impact ball reciprocating screw pair according to claim 2, characterized in that: The first circular arc, the second circular arc and the third circular arc are all of the same shape and size, and are all single circular arc H1 or double circular arc H2; The first space curve (4) corresponding to the first circular arc, the second space curve (5) corresponding to the second circular arc, and the third space curve (6) corresponding to the third circular arc are all of the same shape and of the same size.

4. The weak impact ball reciprocating screw pair according to claim 1, characterized in that: The first curve (204) is a projected circle, and the diameter of the projected circle is equal to the pitch of the first spiral groove (101) or the second spiral groove (102); The second curve (205) is a projected circle, and the diameter of the projected circle is equal to the pitch of the first spiral groove (101) or the second spiral groove (102); Or, the first curve (204) is a projected ellipse, and the major axis of the projected ellipse is parallel to the axial direction of the slider sleeve (2), and the length of the major axis is equal to the pitch of the first spiral groove (101) or the second spiral groove (102); The second curve (205) is a projected ellipse, and the major axis of the projected ellipse is parallel to the axial direction of the slider sleeve (2), and the length of the major axis is equal to the pitch of the first spiral groove (101) or the second spiral groove (102).

5. The weak impact ball reciprocating screw pair according to any one of claims 1 to 4, characterized in that: The slider sleeve (2) comprises three half-shells (206) divided along the circumferential direction, the inner walls of the three half-shells (206) respectively having the first closed groove (201), the pit (202) and the second closed groove (203), each half-shell (206) having a connecting flange (2061) along the circumferential edge, and the three half-shells (206) are detachably connected via the connecting flange (2061).

6. A method for manufacturing a weak-impact ball reciprocating screw pair, based on the weak-impact ball reciprocating screw pair according to claim 5, wherein the weak-impact ball reciprocating screw pair comprises a screw (1), a slider sleeve (2) and three balls (3) arranged between the screw (1) and the slider sleeve (2), characterized in that: The manufacturing method comprises the following steps: Step 1, processing a first spiral groove (101), a second spiral groove (102), a first arc transition groove (103) smoothly transitionally connecting the starting point of the first spiral groove (101) and the starting point of the second spiral groove (102), and a second arc transition groove (104) smoothly transitionally connecting the end point of the first spiral groove (101) and the end point of the second spiral groove (102) on the cylindrical outer surface of the lead screw (1); Step 2, machining a first closed groove (201), a second closed groove (203) and a pit (202) on the inner surface of the slider sleeve (2), wherein the first closed groove (201), the pit (202) and the second closed groove (203) are evenly distributed along the circumference of the slider sleeve (2); Step 3, sleeve the slider sleeve (2) onto the lead screw (1), so that each of the pit (202), the first closed groove (201) and the second closed groove (203) has a ball (3).

7. The method for manufacturing a weak-impact ball reciprocating screw pair according to claim 6, characterized in that: The step 1 includes the following sub-steps: Sub-step 1.1, determining the starting points of the first helix (105) and the second helix (106) on the outer surface of the cylinder near the first end of the lead screw (1), and determining the end points of the first helix (105) and the second helix (106) on the outer surface of the cylinder near the second end of the lead screw (1); wherein the first helix (105) is used to form the first helix groove (101), and the second helix (106) is used to form the second helix groove (102); Sub-step 1.2, starting from the starting point, drawing the first spiral line (105) and the second spiral line (106) with opposite rotation directions and equal pitches, wherein the first spiral line (105) and the second spiral line (106) intersect at the end point; Sub-step 1.3, performing arc transition processing on the first spiral line (105) and the second spiral line (106) at the starting point to form a first arc transition curve (107), and performing arc transition processing on the first spiral line (105) and the second spiral line (106) at the end point to form a second arc transition curve (108); Sub-step 1.4, using the first space curve (4) containing a first circular arc to remove material from the lead screw (1) along the first spiral line (105) to form the first spiral groove (101), using the first space curve (4) containing a first circular arc to remove material from the lead screw (1) along the second spiral line (106) to form the second spiral groove (102), using the first space curve (4) containing a first circular arc to remove material from the lead screw (1) along the first circular arc transition curve (107) to form the first circular arc transition groove (103), using the first space curve (4) containing a first circular arc to remove material from the lead screw (1) along the second circular arc transition curve (108) to form the second circular arc transition groove (104).

8. The method for manufacturing a weak-impact ball reciprocating screw pair according to claim 7, characterized in that: The step 2 includes the following sub-steps: Sub-step 2.1, creating a first axial section S1, a second axial section S2, and an angle bisector S3 of the first axial section S1 and the second axial section S2, each with an angle of 60°, on the slider sleeve (2); Sub-step 2.2, drawing a first projection circle curve (204) on the first axial section S1, and drawing a second projection circle curve (205) on the second axial section S2, so that the centers of the two projection circles are located on the same cross section of the slider sleeve (2), the diameter of the projection circle is equal to the pitch of the first spiral groove (101) or the pitch of the second spiral groove (102), and projecting them onto the inner wall of the slider sleeve (2) to form the first projection curve and the second projection curve respectively; or, Draw a first projected ellipse curve (204) on the first axial section S1, and draw a second projected ellipse curve (205) on the second axial section S2, so that the centers of the two projected ellipses are located on the same cross section of the slider sleeve (2), the major axis of the projected ellipse is parallel to the axial direction of the slider sleeve (2), and the length of the major axis is equal to the pitch of the first spiral groove (101) or the second spiral groove (102), and are projected onto the inner wall of the slider sleeve (2) to form the first projected curve and the second projected curve respectively; Sub-step 2.3, using a third space curve (6) to perform material removal processing on the slider sleeve (2) along the first projection curve to form the first closed groove (201), and using a third space curve (6) to perform material removal processing on the slider sleeve (2) along the second projection curve to form a second closed groove (203); wherein the third space curve (6) and the first space curve (4) have the same shape and the same size; Sub-step 2.4, drawing a second space curve (5) on the angle bisector plane S3, so that the center of the second space curve (5) and the centers of the two third space curves (6) are located on the same cross section of the slider sleeve (2) and on the inner surface of the slider sleeve (2), and the second space curve (5) is rotated around a central axis perpendicular to the axis of the slider sleeve (2) to perform material removal processing on the slider sleeve (2) to form the pit (202); wherein the second space curve (5) and the first space curve (4) have the same shape and the same size; Sub-step 2.5, cutting a set thickness of material from the inner surface of the slider sleeve (2) to form a gap between the slider sleeve (2) and the lead screw (1).

9. The method for manufacturing a weak-impact ball reciprocating screw pair according to claim 8, characterized in that: The step 3 includes the following sub-steps: Sub-step 3.1, dividing the slider sleeve (2) into three half-tiles (206) evenly along the circumferential direction, so that the inner walls of the three half-tiles (206) respectively have the first closed groove (201), the pit (202) and the second closed groove (203), and each half-tile (206) is provided with a connecting flange (2061) along the circumferential edge, and a mounting hole is processed on the connecting flange (2061); Sub-step 3.2, placing the three balls (3) into the first closed groove (201), the pit (202) and the second closed groove (203) respectively, and making the three balls (3) located in the first spiral groove (101) or the second spiral groove (102), and detachably connecting the three half-washers (206) to the screw (1) by connecting bolts and nuts.

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