Ball circulation guide

Abstract

The present invention discloses a ball circulation guide device, which includes a guide member, an open nut, an open shield, a first circulator, a second circulator and a ball circulation group. The open nut is inserted and slidably moved on the guide member. The open nut includes an axial cylinder, which has an axial opening. The inner spiral groove of the axial cylinder and the spiral groove of the guide member correspond to each other and jointly form an inner ball channel. The open shield is axially sleeved on the outer periphery of the axial cylinder, and the inner peripheral wall of the open shield and the outer ring wall of the axial cylinder correspond to each other and jointly form an outer spiral ball channel. The first circulator is arranged on the first axial wall of the axial cylinder. The second circulator is arranged on the second axial wall of the axial cylinder. The inner ball channel, the first bend, the outer spiral ball channel and the second bend jointly form a ball circulation channel, and the ball circulation group rolls in the ball circulation channel.

Description

Technical Field

[0001] The invention relates to a ball circulation guide device, in particular to a ball circulation guide device with an axial opening. Background Art

[0002] Today's ball screw devices convert rotational motion into linear motion through the cooperation of the screw and nut. The balls rolling in the circulation path of the ball nut cooperate with the screw with spiral grooves to reduce the friction generated between the ball nut and the screw when they move relative to each other.

[0003] Most existing ball nuts are in the shape of a complete cylinder. When the screw is long and a support seat is provided to prevent the screw from sagging, a retreat mechanism needs to be provided on the support seat. When the ball nut rotates on the screw and passes through the support seat, the support seat is temporarily moved away from the screw by the retreat mechanism. After the ball nut passes, the retreat mechanism returns the support seat to the supporting position to provide the support force required by the screw.

[0004] However, the above method requires, on the one hand, an additional retreat mechanism to be provided on each support seat. On the other hand, when each support seat is away from the screw, if the section of the screw sags due to its own weight, the screw may have additional shaking when the ball nut passes through the section of the screw, or the ball may be unable to roll in the thread groove due to the bending of the screw, thereby affecting the manufacturing accuracy when actually used in the process. Summary of the invention

[0005] In view of this, the present invention provides a ball circulation guide device in one embodiment, including a guide member, an open nut, an open shield, a first circulator, a second circulator and a ball circulation group. The guide member has a central axis and a spiral groove, and the spiral groove is arranged around the outer circumference of the guide member. The open nut is passed through and slid on the guide member. The open nut includes an axial cylinder, and the axial cylinder has an axial opening. The axial cylinder is provided with a first axial wall and a second axial wall on opposite sides of the axial opening. The axial cylinder includes an inner annular wall and an outer annular wall, and the inner annular wall has an inner spiral groove, and the inner spiral groove corresponds to the spiral groove of the guide member and forms an inner ball channel together.

[0006] The open shield is axially sleeved on the outer periphery of the axial cylinder, and the open shield has an inner circumferential wall. The inner circumferential wall and the outer annular wall of the axial cylinder correspond to each other and jointly form an outer spiral ball channel. In a plane projection, the outer spiral ball channel is obliquely arranged relative to the central axis. The plane and the symmetry plane when the open shield is viewed from one end of the central axis are perpendicular to each other and parallel to the central axis. The first circulator is arranged on the first axial wall, and the first circulator includes a first bend. The two ends of the first bend correspond to the inner ball channel and the outer spiral ball channel, respectively. The second circulator is arranged on the second axial wall. The second circulator includes a second bend, and the two ends of the second bend correspond to the inner ball channel and the outer spiral ball channel, respectively. The ball circulation group includes a plurality of steel balls. Among them, the inner ball channel, the first bend, the outer spiral ball channel and the second bend jointly form a ball circulation channel, and the ball circulation group rolls in the ball circulation channel.

[0007] Since the axial barrel of the open nut has an axial opening, when the ball nut is set on the guide (such as a screw or a conversion rod) and moved, even if a support seat is set below the guide, the open nut can pass through the support seat through the axial opening without interfering with the support seat. In this way, there is no need to set a retreat mechanism on the support seat. And when the open nut passes through the support seat, the support seat can maintain the state of supporting the guide member, and will not cause the guide member to sag and deform due to the departure of the support seat, affecting the manufacturing accuracy when actually used in the process. In addition to forming an outer spiral ball channel with the axial barrel so that the steel ball rolls in the outer spiral ball channel, the open shield can also provide dust prevention.

[0008] In some embodiments, the inner peripheral wall surface and the outer ring wall further form another outer spiral ball channel. The two ends of the first bend correspond to the inner ball channel and the other outer spiral ball channel. The two ends of the second bend correspond to the inner ball channel and the other outer spiral ball channel. The inner ball channel, the first bend, the other outer spiral ball channel and the second bend together form another ball circulation channel. The ball circulation group selectively rolls in the ball circulation channel or the other ball circulation channel.

[0009] In some embodiments, the first bend is disposed obliquely relative to a short side of the first circulator, and the second bend is disposed obliquely relative to a short side of the second circulator.

[0010] In some embodiments, the first bend and the short side of the first circulator are arranged parallel to each other, and the second bend and the short side of the second circulator are arranged parallel to each other.

[0011] In some embodiments, the first circulator has a plurality of first bends, each of which is arranged parallel to each other. The second circulator has a plurality of second bends, each of which is arranged parallel to each other.

[0012] In some embodiments, the ball circulation guide device further includes a ball retainer, and a plurality of steel balls are connected in series through the ball retainer.

[0013] In some embodiments, the outer ring wall of the axial cylinder has an outer groove to form an outer spiral ball channel together with the inner circumferential wall. Further, in some embodiments, the inner circumferential wall of the opening shield has an inner groove, which is arranged corresponding to the outer groove, so that the outer groove and the inner groove correspond to form an outer spiral ball channel.

[0014] In some embodiments, the inner peripheral wall of the open shield has an inner groove to form an outer spiral ball channel together with the outer annular wall of the axial cylinder.

[0015] The detailed features and advantages of the present invention are described in detail in the following embodiments, and the contents are sufficient to enable anyone familiar with the relevant skills to understand the technical content of the present invention and implement it accordingly. Moreover, according to the contents disclosed in this specification, the claims and the drawings, any person familiar with the relevant skills can easily understand the relevant purposes and advantages of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a ball circulation guide device according to an embodiment of the present invention;

[0017] Figure 2 An exploded view of a ball circulation guide device according to an embodiment of the present invention;

[0018] Figure 3 An exploded view of a ball circulation guide device according to an embodiment of the present invention from another perspective;

[0019] Figure 4 A top view of a split nut according to an embodiment of the present invention; and

[0020] Figure 5 A top view of a second circulator according to an embodiment of the present invention.

[0021] Wherein, the reference numerals are:

[0022] 10 Guide 11 Spiral groove

[0023] 20 Open nut 21 Axial cylinder

[0024] 211 axial opening 212 first axial wall

[0025] 213 second axial wall 214 inner annular wall

[0026] 2141 inner spiral groove 215 outer ring wall

[0027] 2151 Outer channel 30 opening shield

[0028] 31 inner wall 40 first circulator

[0029] 41 First bend 50 Second circulator

[0030] 51 Second bend 60 Ball circulation group

[0031] 61 Steel Ball A Angle

[0032] C Center axis P Top view direction DETAILED DESCRIPTION

[0033] Please read first Figures 1 to 5 , Figure 1 This is a three-dimensional diagram of a ball circulation guide device according to an embodiment of the present invention. Figure 2 This is an exploded view of a ball circulation guide device according to an embodiment of the present invention. Figure 3 This is an exploded view of a ball circulation guide device according to an embodiment of the present invention from another perspective. Figure 4 FIG. 1 is a top view of a split nut according to an embodiment of the present invention. Figure 5 A top view of a second circulator according to an embodiment of the present invention.

[0034] Depend on Figure 1 and Figure 2 It can be seen that in this embodiment, the ball circulation guide device includes a guide member 10, an open nut 20, an open shield 30, a first circulator 40, a second circulator 50 and a ball circulation group 60. The guide member 10 can be, for example, a screw or a conversion rod. In this embodiment, a screw is used as an example. Figure 1 It can be seen that the guide member 10 has a central axis C and a spiral groove 11 .

[0035] Depend on Figure 1 and Figure 2 It can be seen that the open nut 20 includes an axial cylinder 21, and the axial cylinder 21 has an axial opening 211. The axial cylinder 21 is provided with a first axial wall 212 and a second axial wall 213 on opposite sides of the axial opening 211. The axial cylinder 21 includes an inner annular wall 214 and an outer annular wall 215, and the inner annular wall 214 has an inner spiral groove 2141. The inner spiral groove 2141 and the spiral groove 11 of the guide member 10 correspond to each other and form an inner ball channel together. In detail, the guide member 10 has a spiral groove 11 arranged around the outer circumference of the guide member 10. The spiral groove 11 is arranged around the outer circumference of the guide member 10 at a desired helical angle. The open nut 20 axially penetrates and slides on the guide member 10, so that the inner spiral groove 2141 and the spiral groove 11 of the guide member 10 correspond to each other and form an inner ball channel together.

[0036] The open shield 30 is axially sleeved on the outer periphery of the axial cylinder 21. The open shield 30 has an inner peripheral wall 31, and the inner peripheral wall 31 corresponds to the outer annular wall 215 of the axial cylinder 21 and forms an outer spiral ball channel together. In this embodiment, in order to enable the ball circulation group 60 to circulate and roll in the outer spiral ball channel, an outer groove 2151 is formed on the outer annular wall 215 of the axial cylinder 21. At this time, the outer groove 2151 and the inner peripheral wall 31 cooperate with each other to form an outer spiral ball channel.

[0037] In other embodiments, an inner groove may be formed on the inner circumferential wall 31 of the open shield 30, and the outer annular wall 215 of the axial cylinder 21 may be a plane, so that the inner groove and the outer annular wall 215 of the axial cylinder 21 may form an outer spiral ball channel together. Alternatively, in other embodiments, an outer groove 2151 may be provided on the outer annular wall 215 of the axial cylinder 21 and an inner groove corresponding to each other may be provided on the inner circumferential wall 31 of the open shield 30, and when the open shield 30 is correspondingly assembled on the axial cylinder 21, the inner groove on the inner circumferential wall 31 and the outer groove 2151 of the outer annular wall 215 may form an outer spiral ball channel together.

[0038] In addition, the open shield 30 can form an outer spiral ball channel together with the axial cylinder 21 to allow the ball circulation group 60 to roll in the outer groove 2151, and can also provide a dust-proof effect.

[0039] In this embodiment, Figure 2 and Figure 3 It can be seen that there are multiple inner spiral grooves 2141 and outer grooves 2151, but this is only for example. In practice, only one inner spiral groove 2141 and one outer groove 2151 can be provided according to the needs, but two or more inner spiral grooves 2141 and outer grooves 2151 can also be provided. Figure 2 and Figure 3 In order to make the drawings clear and concise, only one of them is marked as an example.

[0040] Next, please also refer to Figures 2 to 4 In order to clearly represent each plane and axis, Figure 2 The three mutually perpendicular XYZ axes are provided to clarify the relationship between the various perspectives in the space, and the subsequent descriptions of the various drawings will also be based on these coordinate axes. Figure 2 and Figure 4 It can be seen that the central axis C of the guide member 10 extends along the X-axis direction. For the convenience of explanation, a symmetry plane is defined as a plane that makes the open shield 30 or the open nut 20 symmetrical when viewed from one end of the central axis C (for example, from one end of the X-axis to the positive direction of the X-axis), that is, Figure 2The plane formed by the XZ axis is shown in . In addition, the direction along the Z axis from the top of the figure to the bottom (looking in the negative direction of the Z axis) is defined as the top view direction P. The plane perpendicular to the symmetry plane and parallel to the central axis C is Figure 2 The plane formed by the XY axes shown in is also the plane formed when viewed from the top direction P. Figure 4 It can be seen that in this embodiment, the outer groove 2151 used as the outer spiral ball channel is an outer groove 2151 spirally arranged on the outer ring wall 215. From the top view direction P, it can be clearly seen that the groove direction of each outer groove 2151 is the oblique direction shown in the figure (inclined from the upper left to the lower right, and the style of the outer groove 2151 is commonly known as an oblique groove). In other embodiments, it can also be inclined in another direction, such as from the upper right to the lower left. When the outer groove 2151 and the central axis C are aligned with each other, the outer groove 2151 and the central axis C are aligned with each other. Figure 4 When projected in the direction shown (i.e., the top-view direction P) onto a plane (i.e., the plane formed by the XY axes), in the plane projection formed by the top-view direction P, the outer groove 2151 is obliquely arranged relative to the center axis C, that is, the angle A between the two is not a right angle.

[0041] Furthermore, since the inner spiral groove 2141 and the outer groove 2151 are both spirally arranged, when the two are spiral grooves with the same helix angle, that is, as shown in the present embodiment, when the inner spiral groove 2141 and the outer groove 2151 are arranged parallel to each other, since the inclination angles of the two are the same, when the ball circulation group 60 rolls in the ball circulation channel, its load can roll more continuously and smoothly without the problem of excessive rolling angle conversion causing discontinuous rolling.

[0042] Next, please refer to 1 to Figure 3 and Figure 5 The first circulator 40 is disposed on the first axial wall 212. The first circulator 40 includes a first bend 41, and the two ends of the first bend 41 are respectively connected to the inner spiral groove 2141 (inner ball channel) and the outer groove 2151 (outer spiral ball channel). The second circulator 50 is disposed on the second axial wall 213. The second circulator 50 includes a second bend 51, and the two ends of the second bend 51 are respectively connected to the inner spiral groove 2141 (inner ball channel) and the outer groove 2151 (outer spiral ball channel).

[0043] In this embodiment, Figure 2 and Figure 5 It can be seen that there are multiple first bends 41 and second bends 51, but this is only for example. In practice, only one first bend 41 and one second bend 51 may be provided according to needs, but two or more first bends 41 and second bends 51 may also be provided. Figure 2In order to make the drawing clear and concise, only one of the first bend 41 and the second bend 51 is marked as an example.

[0044] The first circulator 40 and the second circulator 50 can be set on the first axial wall 212 and the second axial wall 213 by screwing, bonding or clamping. If they are fixed by screwing, when the first circulator 40 and the second circulator 50 are worn out due to long-term use, only the first circulator 40 and the second circulator 50 can be replaced.

[0045] Furthermore, the first circulator 40 and the second circulator 50 shown in the present embodiment have the same structure, so that only one type of element needs to be manufactured during manufacturing, that is, it can be used as the first circulator 40 and the second circulator 50 at the same time. Of course, the first circulator 40 and the second circulator 50 with different structures can also be used according to actual use requirements. For example, the first circulator 40 and the second circulator 50 with different numbers of bends are used, or the first circulator 40 and the second circulator 50 with bends with different arrangements or arrangement spacings are used.

[0046] In addition, although the first circulator 40 and the second circulator 50 each having 8 first bends 41 and the second bend 51 are used as examples in this embodiment, the present invention is not limited thereto. In some embodiments, the first circulator 40 and the second circulator 50 can be, for example, a first circulator 40 and a second circulator 50 having two bends and being shorter. In this way, when the axial cylinder 21 is relatively small or the number of the inner spiral groove 2141 and the outer groove 2151 provided on the axial cylinder 21 is small, for example, only one each, the first circulator 40 and the second circulator 50 having fewer bends can be used. When the first circulator 40 and the second circulator 50 having more bends are needed, multiple first circulators 40 and the second circulator 50 having two bends can be locked to meet the needs of various sizes. It is not necessary to make first circulators 40 and the second circulator 50 of various corresponding lengths for axial cylinders 21 of various different lengths.

[0047] Depend on Figure 2 It can be seen that each ball circulation group 60 includes a plurality of steel balls 61. Figure 1After the first circulator 40 and the second circulator 50 are assembled, the first bend 41 of the first circulator 40 disposed on the first axial wall 212 of the axial cylinder 21 will correspond to the inner ball channel and the outer spiral ball channel, and the second bend 51 of the second circulator 50 disposed on the second axial wall 213 of the axial cylinder 21 will correspond to the inner ball channel and the outer spiral ball channel. The inner ball channel, the first bend 41, the outer spiral ball channel and the second bend 51 will form a ball circulation channel together. All the steel balls 61 in the ball circulation group 60 will circulate and roll in the ball circulation channel.

[0048] By means of the above structure, by arranging the first circulator 40 and the second circulator 50 on the axial cylinder 21, the inner spiral groove 2141 on the inner ring wall 214 of the axial cylinder 21 and the outer groove 2151 on the outer ring wall 215 can be connected through the first circulator 40 and the second circulator 50. At the same time, the ball circulation group 60 can be more smoothly in the process of rolling from the inner spiral groove 2141 to the outer groove 2151.

[0049] At the same time, although the above description only describes a single ball circulation channel, Figure 2 and Figure 3 As shown, the number of ball circulation channels required can be set according to the needs, which can be one group, or two or more groups of ball circulation channels. It can be freely matched according to the needs of light and heavy loads. For example, only two groups of ball circulation channels can be used, or multiple groups can be set, or full rows can be set on the entire open nut 20 and the open shield 30, so as to achieve light and heavy loads.

[0050] Next, please refer to Figure 2 and Figure 3 Here, a set of ball circulation group 60 is decomposed for illustration, which is also used to show the arrangement of the steel balls 61 of the ball circulation group 60 in the ball circulation channel. The ball circulation group 60 will form a ring along the inner ball channel, the first bend 41, the outer spiral ball channel and the second bend 51, and circulate in an independent ball circulation channel. In actual application, Figure 2 and Figure 3 As shown in , multiple groups of ball circulation groups 60 can be set, and each group of ball circulation groups 60 will only continue to roll in the ball circulation channel in which it is set.

[0051] With the above structure, since the axial opening 211 is provided on the axial barrel 21 of the split nut 20, when the split nut 20 moves on the guide member 10, even if an additional support assembly (such as a support seat, not shown) is provided below the guide member 10, the split nut 20 can pass through the support assembly through the axial opening 211 without interfering with the support assembly. In this way, there is no need to provide a retreat mechanism on the support assembly, so that the support assembly retreats away from the guide member 10 when a general cylindrical ball nut is to pass through. And when the split nut 20 passes through the support assembly, the support assembly can maintain the state of supporting the guide member 10, and will not cause the guide member 10 to sag and deform, which will affect the manufacturing accuracy when it is actually used in the process.

[0052] In this embodiment, an inner ball channel, a first bend 41, an outer spiral ball channel and a second bend 51 together form a ball circulation channel. All the steel balls 61 in a ball circulation group 60 will circulate and roll in a ball circulation channel. Figure 2 and Figure 3 It can be seen that in this embodiment, there are multiple ball circulation channels and multiple ball circulation groups 60, which are respectively arranged in corresponding groups, and each ball circulation group 60 circulates and rolls independently in the arranged ball circulation channels.

[0053] In other embodiments, the two ends of the first bend 41 may be connected to an inner ball channel and another outer spiral ball channel respectively, and the two ends of the second bend 51 may be connected to an inner ball channel and another outer spiral ball channel respectively. For example, if the inner spiral grooves 2141 (inner ball channels) arranged in sequence are arranged from one end as the first, second, ... Nth, and the outer grooves 2151 (outer spiral ball channels) arranged in sequence are also arranged from the same end as the first, second, ... Nth. One end of the first bend 41 can be connected to the outer groove 2151 located in the first lane, and the other end can be connected to the inner spiral groove 2141 located in the second lane, instead of being connected to the inner spiral groove 2141 which is also the first lane. The two ends of the second bend 51 correspond to the connection mode of the first bend 41, with one end connected to the outer groove 2151 located in the first lane, and the other end connected to the inner spiral groove 2141 located in the second lane. This can be achieved by adjusting the inclinations of the first curve 41 and the second curve 51 .

[0054] For example, when the first curve 41 is disposed obliquely and the second curve 51 is also disposed obliquely, by adjusting the inclinations of the first curve 41 and the second curve 51, the inner spiral groove 2141 can be connected to the outer groove 2151 of a different track to achieve a track-jumping effect.

[0055] Thus, a ball circulation channel is formed by the second inner ball channel, a first bend 41, a first outer spiral ball channel and a second bend 51. The ball circulation group 60 arranged in the ball circulation channel will circulate and roll in the second inner ball channel, a first bend 41, a first outer spiral ball channel and a second bend 51. Thus, by setting different circulators, different inner ball channels and outer spiral ball channels can be matched to form independent ball circulation channels of different combinations. In this way, users can flexibly match heavy loads or light loads.

[0056] In this embodiment, since the inner spiral groove 2141 and the outer groove 2151 are spiral grooves with the same spiral angle, the first bend 41 and the short side of the first circulator 40 are arranged parallel to each other, and the second bend 51 and the short side of the second circulator 50 are arranged parallel to each other. Since the first circulator 40 and the second circulator 50 are the same structure, Figure 5 Only the second circulator 50 is used as an example for explanation. Figure 5 The top view of the figure can more clearly understand that when there are multiple second bends 51 of the second circulator 50, each second bend 51 is arranged in parallel with each other, and is arranged straight from top to bottom, that is, it will be arranged parallel to the short side of the second circulator 50. Similarly, there are multiple first bends 41, and each first bend 41 will be arranged parallel to each other. If the first circulator 40 is moved to the same viewing angle as the second circulator 50, that is, when the opening is on top, the first bend 41 is also arranged straight from top to bottom, that is, it will be arranged parallel to the short side of the first circulator 40. Thereby, when the first bend 41 is to be formed on the first circulator 40, or when the second bend 51 is to be formed on the second circulator 50, it will be more convenient to locate the direction to be milled. Or when the first circulator 40 or the second circulator 50 is manufactured by injection molding, the manufacture and demolding of the mold will be easier.

[0057] In addition, in this embodiment, the steel balls 61 provided in the ball circulation guide device do not need to be provided with a ball retainer, and can roll in each independent ball circulation channel under the limitation of the ball circulation channel formed by the guide 10, the open nut 20, the open shield 30, the first circulator 40 and the second circulator 50 without falling out of the ball circulation channel. However, in other embodiments, multiple steel balls 61 in the ball circulation group 60 can also be connected in series by providing a ball retainer.

[0058] Although the present invention is disclosed as above with the aforementioned embodiments, it is not intended to limit the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be subject to the scope defined by the claims attached to this specification.

Claims

1. A ball circulation guide device, characterized in that: include: A guide member having a central axis and a spiral groove, wherein the spiral groove is disposed around the outer circumference of the guide member; an open nut, which is inserted and slidably moved on the guide member, the open nut comprises an axial cylinder having an axial opening, the axial cylinder being provided with a first axial wall and a second axial wall on opposite sides of the axial opening, the axial cylinder comprising an inner annular wall and an outer annular wall, the inner annular wall having an inner spiral groove, the inner spiral groove and the spiral groove of the guide member corresponding to each other and forming an inner ball channel together; An open shield is coaxially sleeved on the outer periphery of the axial cylinder, the open shield has an inner peripheral wall, the inner peripheral wall and the outer ring wall of the axial cylinder correspond to each other and form an outer spiral ball channel together, the outer spiral ball channel is obliquely arranged relative to the central axis in a plane projection, the plane and a symmetry plane when the open shield is viewed from one end of the central axis are perpendicular to each other and parallel to the central axis; A first circulator is disposed on the first axial wall, the first circulator comprises a first bend, two ends of the first bend are respectively connected to the inner ball channel and the outer spiral ball channel; a second circulator, disposed on the second axial wall, the second circulator comprising a second bend, two ends of the second bend correspondingly communicating with the inner ball channel and the outer spiral ball channel; and A ball circulation group includes a plurality of steel balls, wherein the inner ball channel, the first bend, the outer spiral ball channel and the second bend together form a ball circulation channel, and the ball circulation group rolls in the ball circulation channel.

2. The ball circulation guide device according to claim 1, characterized in that: The inner circumferential wall surface and the outer ring wall also form another outer spiral ball channel, the two ends of the first bend are respectively connected to the inner ball channel and the other outer spiral ball channel, the two ends of the second bend are respectively connected to the inner ball channel and the other outer spiral ball channel, the inner ball channel, the first bend, the other outer spiral ball channel and the second bend together form another ball circulation channel, and the ball circulation group rolls in the other ball circulation channel.

3. The ball circulation guide device according to claim 1, characterized in that: The first bend is disposed obliquely relative to the short side of the first circulator, and the second bend is disposed obliquely relative to the short side of the second circulator.

4. The ball circulation guide device according to claim 1, characterized in that: The first bend is arranged parallel to the short side of the first circulator, and the second bend is arranged parallel to the short side of the second circulator.

5. The ball circulation guide device according to claim 1, characterized in that: The first circulator has a plurality of first bends, each of which is arranged in parallel with each other. The second circulator has a plurality of second bends, each of which is arranged in parallel with each other.

6. The ball circulation guide device according to claim 1, characterized in that: The invention also comprises a ball retainer, wherein the steel balls are connected in series by the ball retainer.

7. The ball circulation guide device according to claim 1, characterized in that: The outer ring wall of the axial cylinder has an outer groove to form the outer spiral ball channel together with the inner peripheral wall.

8. The ball circulation guide device according to claim 7, characterized in that: The inner peripheral wall of the opening shield has an inner groove, and is arranged corresponding to the outer groove, so that the outer groove and the inner groove correspond to form the outer spiral ball channel.

9. The ball circulation guide device according to claim 1, characterized in that: The inner peripheral wall of the opening shield has an inner groove to form the outer spiral ball channel together with the outer ring wall of the axial cylinder.

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