阅读说明：本技术 滚珠循环导引装置 (Ball circulation guiding device ) 是由 李思颖 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种滚珠循环导引装置,其包括导引件、开口螺帽、多个开口护罩、第一循环器、第二循环器以及多个滚珠循环组。开口螺帽穿设滑移于导引件上。开口螺帽包括轴向筒体,轴向筒体具有轴向开口。轴向筒体的内螺旋槽道与导引件的螺旋槽道彼此对应并共同形成内滚珠通道。多个开口护罩轴向套设于轴向筒体外周,各开口护罩的内周壁与轴向筒体的外环壁彼此对应并共同形成外滚珠通道。第一循环器与第二循环器对应于开口护罩设置于轴向筒体。其中,内滚珠通道、第一弯道、外滚珠通道及第二弯道共同形成滚珠循环通道,滚珠循环组滚动于滚珠循环通道中。(The invention discloses a ball circulation guiding device which comprises a guiding piece, an open nut, a plurality of open shields, a first circulator, a second circulator and a plurality of ball circulation groups. The open nut is arranged on the guide piece in a penetrating and sliding mode. The split nut includes an axial barrel having an axial opening. The inner spiral groove of the axial cylinder and the spiral groove of the guide piece correspond to each other and form an inner ball channel together. The plurality of opening shields are axially sleeved on the periphery of the axial cylinder body, and the inner circumferential wall of each opening shield and the outer circumferential wall of the axial cylinder body correspond to each other and form an outer ball channel together. The first circulator and the second circulator are arranged on the axial cylinder corresponding to the opening protective cover. The ball circulation group rolls in the ball circulation channel.)

1. A ball circulation guide device comprising:

the guide piece is provided with a central shaft and a plurality of spiral grooves which are arranged around the outer ring of the guide piece;

the open nut is arranged on the guide piece in a penetrating and sliding mode and comprises an axial cylinder body, the axial cylinder body is provided with an axial opening, a first axial wall and a second axial wall are arranged on two opposite sides of the axial opening of the axial cylinder body, the axial cylinder body comprises an inner annular wall and an outer annular wall, the inner annular wall is provided with a plurality of inner spiral channels, and the inner spiral channels and the spiral channels of the guide piece correspond to each other and form a plurality of inner ball channels together;

the opening shields are coaxially sleeved on the periphery of the axial cylinder body and provided with an inner peripheral wall, the inner peripheral wall and the outer peripheral wall of the axial cylinder body correspond to each other and form an outer ball channel together, and the outer ball channels are perpendicular to the central shaft in a plane projection formed by a radial direction;

the first circulator is arranged on the first axial wall and comprises a plurality of first bent channels, and two ends of each first bent channel are respectively and correspondingly communicated with one of the inner ball channels and one of the outer ball channels;

the second circulator is arranged on the second axial wall and comprises a plurality of second bent channels, and two ends of each second bent channel are respectively and correspondingly communicated with one of the inner ball channels and one of the outer ball channels; and

and a plurality of ball circulation groups, each of the ball circulation groups including a plurality of balls, wherein one of the inner ball passages, one of the first curved passages, one of the outer ball passages and one of the second curved passages form a first ball circulation passage, the other of the inner ball passages, the other of the first curved passages, the other of the outer ball passages and the other of the second curved passages form a second ball circulation passage, one of the ball circulation groups rolls in the first ball circulation passage, and the other of the ball circulation groups rolls in the second ball circulation passage.

2. A ball circulation guide device comprising:

the guide piece is provided with a central shaft and a plurality of spiral grooves which are arranged around the outer ring of the guide piece;

the open nut is arranged on the guide piece in a penetrating and sliding mode and comprises an axial cylinder body, the axial cylinder body is provided with an axial opening, a first axial wall and a second axial wall are arranged on two opposite sides of the axial opening of the axial cylinder body, the axial cylinder body comprises an inner annular wall and an outer annular wall, the inner annular wall is provided with a plurality of inner spiral channels, and the inner spiral channels and the spiral channels of the guide piece correspond to each other and form a plurality of inner ball channels together;

the opening shields are coaxially sleeved on the periphery of the axial cylinder body and provided with an inner peripheral wall, the inner peripheral wall and the outer peripheral wall of the axial cylinder body correspond to each other and form an outer ball channel together, the outer ball channels are arranged in a plane projection, each outer ball channel is obliquely arranged relative to the central shaft, and the plane and a symmetrical plane when the opening shields are viewed from one end of the central shaft are mutually perpendicular and parallel to the central shaft;

the first circulator is arranged on the first axial wall and comprises a plurality of first bent channels, and two ends of each first bent channel are respectively and correspondingly communicated with one of the inner ball channels and one of the outer ball channels;

the second circulator is arranged on the second axial wall and comprises a plurality of second bent channels, and two ends of each second bent channel are respectively and correspondingly communicated with one of the inner ball channels and one of the outer ball channels; and

and a plurality of ball circulation groups, each of the ball circulation groups including a plurality of balls, wherein one of the inner ball passages, one of the first curved passages, one of the outer ball passages and one of the second curved passages form a first ball circulation passage, the other of the inner ball passages, the other of the first curved passages, the other of the outer ball passages and the other of the second curved passages form a second ball circulation passage, one of the ball circulation groups rolls in the first ball circulation passage, and the other of the ball circulation groups rolls in the second ball circulation passage.

3. The ball circulation guide device according to claim 1 or 2, wherein the first circulator is plural and the second circulator is plural.

4. The ball circulation guide device according to claim 1 or 2, wherein the inner peripheral wall and the outer peripheral wall of one of the open shrouds further form another outer ball passage, both ends of one of the first curved passages are respectively and correspondingly communicated with one of the inner ball passages and the other outer ball passage, both ends of one of the second curved passages are respectively and correspondingly communicated with one of the inner ball passages and the other outer ball passage, one of the inner ball passages, one of the first curved passages, the other outer ball passage and one of the second curved passages together form a third ball circulation passage, and one of the ball circulation sets rolls in the third ball circulation passage.

5. The ball circulation guide device according to claim 1 or 2, wherein the first curves are disposed obliquely with respect to a short side of the first circulator, and the second curves are disposed obliquely with respect to a short side of the second circulator.

6. The ball circulation guide device according to claim 2, wherein the first curved channels and the short sides of the first circulator are disposed in parallel with each other, and the second curved channels and the short sides of the second circulator are disposed in parallel with each other.

7. The ball circulation guide device according to claim 1 or 2, wherein the first curve of the first circulator is a plurality of curves, each of the first curves is arranged in parallel with each other, and the second curve of the second circulator is a plurality of curves, each of the second curves is arranged in parallel with each other.

8. The ball circulation guide device according to claim 1 or 2, further comprising a ball retainer, the balls being connected in series by the ball retainer.

9. The ball circulation guide device according to claim 1 or 2, wherein the outer circumferential wall of the axial cylinder has a plurality of outer grooves to form the outer ball passages together with the inner circumferential walls.

10. The ball circulation guide device according to claim 9, wherein the inner peripheral wall of each of the split shields has an inner groove and is disposed corresponding to the outer grooves such that the outer grooves and the inner grooves correspond to form the outer ball passages.

11. The ball circulation guide device according to claim 1 or 2, wherein the inner peripheral wall of each of the open shrouds has an inner groove to form the outer ball passages together with the outer annular wall of the axial cylinder.

Technical Field

The present invention relates to a ball circulation guide device, and more particularly, to a ball circulation guide device having a split nut with an axial opening.

Background

In the ball screw device of the prior art, the screw and the nut are engaged to convert the rotational motion into the linear motion. The balls arranged in the circulation passage in the ball nut are matched with the screw rod with the spiral groove, so that the friction force generated between the ball nut and the screw rod during relative motion is reduced.

Current ball nut is mostly complete cylindric, and when the screw rod was longer and be provided with the flagging supporting seat of avoiding the screw rod, just need set up in the supporting seat and move back a position the mechanism. When the ball nut rotates on the screw rod to pass through the position where the support seat is arranged, the support seat is temporarily away from the screw rod through the position withdrawing mechanism. After the ball nut passes through, the position-withdrawing mechanism makes the support seat return to the support position so as to provide the support force required by the screw rod.

However, in the above manner, on one hand, an additional retreating mechanism needs to be provided for each supporting seat. On the other hand, when each support seat is far away from the screw rod, if the section of the screw rod sags due to the self weight, the screw rod may generate extra shaking when the ball nut passes through the section of the screw rod, or the ball cannot roll in the thread groove due to the bending of the screw rod, and the like, thereby affecting the manufacturing precision during the actual application in the manufacturing process.

Disclosure of Invention

In one embodiment, the ball circulation guide device includes a guide, a split nut, a plurality of split shields, a first circulator, a second circulator, and a plurality of ball circulation sets. The guide member has a central axis and a plurality of spiral grooves. The spiral groove is arranged around the outer circumference of the guide piece. The open nut is arranged on the guide piece in a penetrating and sliding mode. The split nut includes an axial barrel having an axial opening. The axial cylinder body is provided with a first axial wall and a second axial wall at two opposite sides of the axial opening. The axial cylinder comprises an inner ring wall and an outer ring wall, the inner ring wall is provided with an inner spiral groove, and the inner spiral groove and the spiral groove of the guide piece correspond to each other and form an inner ball channel together.

A plurality of opening guard shields are coaxial to be located axial barrel periphery, and each opening guard shield has the internal perisporium. The inner circumferential wall and the outer circumferential wall of the axial cylinder correspond to each other and form an outer ball channel together. In the plane projection formed by the radial direction of the outer ball channels, each outer ball channel is vertical to the central shaft.

The first circulator is arranged on the first axial wall and comprises a plurality of first curves. Two ends of each first bend are respectively and correspondingly communicated with one of the inner ball passages and one of the outer ball passages. The second circulator is arranged on the second axial wall. The second circulator comprises a plurality of second bent channels, and two ends of each second bent channel are respectively and correspondingly communicated with one of the plurality of inner ball channels and one of the plurality of outer ball channels. Each ball circulation group comprises a plurality of steel balls. Wherein one of the plurality of inner ball passages, one of the plurality of first curved passages, one of the plurality of outer ball passages and one of the plurality of second curved passages form a first ball circulation passage together, and the other of the plurality of inner ball passages, the other of the plurality of first curved passages, the other of the plurality of outer ball passages and the other of the plurality of second curved passages form a second ball circulation passage together. One of the ball circulation groups rolls in the first ball circulation passage, and the other of the ball circulation groups rolls in the second ball circulation passage.

In another embodiment, the present invention provides a ball circulation guide device including a guide, an open nut, a plurality of open shrouds, a first circulator, a second circulator, and a plurality of ball circulation sets. The guide member has a central axis and a plurality of spiral channels. The spiral groove is arranged around the outer circumference of the guide piece. The open nut is arranged on the guide piece in a penetrating and sliding mode. The split nut includes an axial barrel having an axial opening. The axial cylinder body is provided with a first axial wall and a second axial wall at two opposite sides of the axial opening. The axial cylinder comprises an inner ring wall and an outer ring wall, the inner ring wall is provided with an inner spiral groove channel, and the inner spiral groove channel and the spiral groove channel of the guide piece correspond to each other and form a plurality of inner ball channels together.

A plurality of opening guard shields are coaxial to be located axial barrel periphery, and each opening guard shield has the internal perisporium. The inner circumferential wall and the outer circumferential wall of the axial cylinder correspond to each other and form an outer ball channel together. The outer ball channels are arranged in plane projection, each outer ball channel is obliquely arranged relative to the central shaft, and the plane is perpendicular to a symmetrical plane when the opening shield is viewed from one end of the central shaft and is parallel to the central shaft.

The first circulator is arranged on the first axial wall and comprises a plurality of first curves. Two ends of each first bend are respectively and correspondingly communicated with one of the inner ball passages and one of the outer ball passages. The second circulator is arranged on the second axial wall. The second circulator comprises a plurality of second bent channels, and two ends of each second bent channel are respectively and correspondingly communicated with one of the plurality of inner ball channels and one of the plurality of outer ball channels. Each ball circulation group comprises a plurality of steel balls. Wherein one of the plurality of inner ball passages, one of the plurality of first curved passages, one of the plurality of outer ball passages and one of the plurality of second curved passages form a first ball circulation passage together, and the other of the plurality of inner ball passages, the other of the plurality of first curved passages, the other of the plurality of outer ball passages and the other of the plurality of second curved passages form a second ball circulation passage together. One of the ball circulation groups rolls in the first ball circulation passage, and the other of the ball circulation groups rolls in the second ball circulation passage.

Since the axial cylinder of the split nut has the axial opening, when the split nut is disposed on the guide (e.g., the screw or the switching rod) to move, even if the support seat is disposed below the guide, the split nut can pass through the support seat via the axial opening at the position where the split nut passes through the support seat without interfering with the support seat. Therefore, the position withdrawing mechanism does not need to be arranged on the supporting seat. When the open nut passes through the support seat, the support seat can maintain the state of supporting the guide piece, and the problem that the guide piece is drooped and deformed because the support seat is separated and the manufacturing precision is influenced when the open nut is actually applied in the manufacturing process can be avoided. The opening protective cover and the axial cylinder body can jointly form an outer ball channel, so that the steel balls can roll in the outer channel, and the dustproof effect can be provided.

The opening protective cover, the first circulator and the second circulator can be arranged in required quantity by matching the modular opening protective cover, the first circulator and the second circulator. For example, for a shorter or lightweight carrier, one or two sets of a split shield, a first circulator and a second circulator may be used in combination. For longer or heavy carriers, multiple sets of opening shields, first and second circulators may be provided at appropriate locations. The modular design can make the application more flexible and more desirable.

In some embodiments, the first circulator is a plurality of and the second circulator is a plurality of.

In some embodiments, the inner circumferential wall and the outer circumferential wall of one of the plurality of open shrouds further form another outer ball passage. Two ends of one of the first curved channels are respectively and correspondingly communicated with one of the inner ball channels and the other outer ball channel. Two ends of one of the second curved channels are respectively and correspondingly communicated with one of the inner ball channels and the other outer ball channel. One of the plurality of inner ball passages, one of the plurality of first curved passages, the other outer ball passage and one of the plurality of second curved passages form a third ball circulation passage. One of the ball circulation groups rolls in the third ball circulation passage.

In some embodiments, the first bend is disposed diagonally with respect to the short side of the first circulator, and the second bend is disposed diagonally with respect to the short side of the second circulator.

In some embodiments, each of the first curves and the short side of the first circulator are disposed parallel to each other, and each of the second curves and the short side of the second circulator are disposed parallel to each other.

In some embodiments, the ball circulation guide device further comprises a ball retainer by which the plurality of steel balls are connected in series.

In some embodiments, the outer annular wall of the axial cylinder has a plurality of outer channels to form, in cooperation with the plurality of inner circumferential walls, an outer ball passage. Further, in some embodiments, the inner peripheral wall of each split shroud has an inner channel and is disposed in correspondence with the plurality of outer channels such that the plurality of outer channels and the plurality of inner channels form outer ball passages in correspondence therewith.

In some embodiments, the inner circumferential wall of each split shroud has an inner channel to form, in cooperation with the outer circumferential wall of the axial cylinder, a plurality of outer ball passages.

The detailed features and advantages of the present invention are described in detail in the following embodiments, which are sufficient for anyone skilled in the art to understand the technical contents of the present invention and to implement the present invention, and the related objects and advantages of the present invention can be easily understood by anyone skilled in the art according to the disclosure of the present specification, the claims and the attached drawings.

Drawings

Fig. 1 is a perspective view of a ball circulation guide device according to a first embodiment of the present invention;

fig. 2 is an exploded view of the ball circulation guide device according to the first embodiment of the present invention;

fig. 3 is an exploded view of the ball circulation guide device according to the first embodiment of the present invention from another perspective;

FIG. 4 is a bottom view of the split sleeve of the first embodiment of the present invention;

FIG. 5 is a top view of a second circulator according to the first embodiment of the invention;

fig. 6 is an exploded view of a ball circulation guide device according to a second embodiment of the present invention;

fig. 7 is an exploded view of the ball circulation guide device according to the second embodiment of the present invention from another perspective;

FIG. 8 is a bottom view of the split sleeve of the second embodiment of the present invention; and

fig. 9 is a top view of a second circulator according to the second embodiment of the present invention.

Wherein, the reference numbers:

10 guide 11 spiral channel

20-opening screw cap 21 axial cylinder

211 axial opening 212 first axial wall

213 second axial wall 214 inner annular wall

2141 an outer circumferential wall of the spiral groove 215

30. 30a opening shield 31, 31a inner peripheral wall

311. 311a inner channel 40, 40a first circulator

41. 41a first bend 50, 50a second circulator

51. 51a second curve 60, 60a ball circulation group

61 Steel ball A, A1 Angle

C center axis P in the plan view direction

Detailed Description

Referring to fig. 1 to 5, fig. 1 is a perspective view of a ball circulation guide device according to a first embodiment of the present invention, fig. 2 is an exploded view of the ball circulation guide device according to the first embodiment of the present invention, fig. 3 is an exploded view of the ball circulation guide device according to the first embodiment of the present invention from another perspective, fig. 4 is a bottom view of an opening sleeve according to the first embodiment of the present invention, and fig. 5 is a top view of a second circulator according to the first embodiment of the present invention.

As can be seen from fig. 1 and 2, in the present embodiment, the ball circulation guide device includes a guide 10, a split nut 20, a plurality of split shrouds 30, a first circulator 40, a second circulator 50, and a plurality of ball circulation groups 60. The guide 10 may be, for example, a screw or a switching rod, which is illustrated as a screw in the present embodiment. As can be seen in fig. 1, the guide 10 has a central axis C and a helical channel 11.

As can be seen in fig. 1 and 2, the split nut 20 comprises an axial cylinder 21, the axial cylinder 21 having an axial opening 211. The axial cylinder 21 has 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 channel 2141 and the spiral channel 11 of the guide 10 correspond to each other and together form an inner ball passage. In detail, the guide 10 has a spiral groove 11 disposed around the outer circumference of the guide 10. The spiral groove 11 is circumferentially provided at a desired helix angle along the outer circumference of the guide 10. The open nut 20 is slidably disposed in the guide member 10 in an axial direction, such 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 passage.

The open-end shield 30 is axially sleeved on the outer periphery of the axial cylinder 21. Each split shroud 30 has an inner circumferential wall 31, and the inner circumferential wall 31 and the outer circumferential wall 215 of the axial cylinder 21 correspond to each other and together form an outer ball passage. In the present embodiment, in order to allow the ball circulation group 60 to circulate in the outer ball passage, an inner groove 311 is formed on the inner circumferential wall 31 of each open-ended shroud 30, and the outer circumferential wall 215 of the axial cylinder 21 is a flat surface, so that the inner groove 311 and the outer circumferential wall 215 of the axial cylinder 21 together form the outer ball passage.

In other embodiments, an outer groove may be formed on the outer annular wall 215 of the axial cylinder 21, and the outer groove and the inner annular wall 31 cooperate to form an outer ball passage. In another embodiment, the outer annular wall 215 of the axial cylinder 21 may have an outer groove and the inner circumferential wall 31 of each open cover 30 may have an inner groove 311 corresponding to each other, and when the open covers 30 are assembled to the axial cylinder 21, the inner groove 311 of the inner circumferential wall 31 and the outer groove of the outer annular wall 215 may form an outer ball passage.

In addition, the split shield 30 may provide a dust-proof effect in addition to forming an outer ball passage together with the axial cylinder 21 so that the ball circulation group 60 rolls in the outer ball passage.

In the present embodiment, as shown in fig. 2 and 3, there are a plurality of inner spiral grooves 2141, which are only exemplary. Only one inner spiral channel 2141 may be provided as needed, but two or more inner spiral channels 2141 may be provided. In fig. 2 and 3, only one of them is shown as an example for clarity and conciseness of the drawings.

Next, referring to fig. 2 to 5, in order to clearly show the planes and the axial directions, the XYZ three-axis coordinates perpendicular to each other are provided in fig. 2 to clearly show the relationship of the viewing angles in the space, and the description of each drawing will be made based on the coordinate axes. As can be seen from fig. 2 and 4, the central axis C of the guide 10 extends in the X-axis direction. For convenience of description, a symmetry plane is defined as a plane that makes the split shield 30 or the split nut 20 symmetrical when the split shield 30 or the split nut 20 is viewed from one end of the central axis C (e.g., from one end of the X-axis to a positive direction of the X-axis), i.e., a plane formed by the XZ axis shown in fig. 2. Further, the top view direction P is defined as the downward view (the negative view along the Z axis) along the Z axis direction from the top of the drawing plane. And a plane perpendicular to the plane of symmetry and parallel to the central axis C, that is, a plane formed by the XY axes shown in fig. 2, is also a plane formed by a plan view of the plane P.

The outer ball channel and the central shaft C are arranged obliquely. Fig. 4 is a schematic view of the split shield 30 viewed from the bottom (positive direction to the Z axis). As shown in fig. 4, the inner channel 311 as the outer ball channel in this embodiment is an inner channel 311 disposed around the inner circumferential wall 31 in the radial direction, and it is clear from the bottom view that the channel direction of each inner channel 311 is an oblique direction (from the upper right to the lower left, the pattern of the inner channel 311 is commonly referred to as an oblique groove). As shown in fig. 4, the inner channel 311 and the central axis C are projected in the upward direction, and in the planar projection formed in the upward direction, the inner channel 311 is disposed obliquely with respect to the central axis C, that is, the included angle a between the two is not a right angle. Similarly, when the inner groove 311 and the central axis C are projected in the plan view direction P and projected on a plane (i.e., a plane formed by XY axes), the inner groove 311 is inclined with respect to the central axis C in the plan view projection formed in the plan view direction P, that is, an angle between the two is not a right angle.

Further, since the inner spiral groove 2141 and the inner groove 311 are both spirally disposed, when they are spiral grooves with the same spiral angle, i.e. when the inner spiral groove 2141 and the inner groove 311 are disposed in parallel, the load can be more continuously and smoothly rolled when the ball circulation set 60 rolls in the ball circulation passage due to the same inclination angle of the inner spiral groove 2141 and the inner groove 311, and there is no problem of discontinuous rolling due to excessive rolling angle conversion.

Next, referring to fig. 1 to 3 and fig. 6, the first circulator 40 is disposed on the first axial wall 212. The first circulator 40 includes a plurality of first curved channels 41, and two ends of each first curved channel 41 are respectively and correspondingly communicated with one of the plurality of inner spiral channels 2141 (inner ball channels) and one of the plurality of inner channels 311 (outer ball channels). The second circulator 50 is disposed on the second axial wall 213. The second circulator 50 includes a plurality of second curved channels 51, and two ends of each second curved channel 51 are respectively and correspondingly communicated with one of the plurality of inner spiral channels 2141 (inner ball channels) and one of the plurality of inner channels 311 (outer ball channels). In the present embodiment, as can be seen from fig. 2 and 3, there are a plurality of first curves 41 and a plurality of second curves 51. In fig. 2 and 3, for clarity and simplicity of the drawings, only one of the first curve 41 and the second curve 51 is illustrated as an example.

The first circulator 40 and the second circulator 50 may be disposed on the first axial wall 212 and the second axial wall 213 by screwing, adhering, or fastening. If the first circulator 40 and the second circulator 50 are fixed by screw-locking, when the first circulator 40 and the second circulator 50 are damaged due to long-term use, only the first circulator 40 and the second circulator 50 can be replaced without replacing the whole ball nut.

Further, 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, and the element 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 having different structures may be used according to actual use requirements. For example, the first and second circulators 40 and 50 having different numbers of curves are used, or the first and second circulators 40 and 50 having curves with different arrangements or arrangement pitches are used.

Next, it can be seen from fig. 2 that each ball circulation group 60 includes a plurality of steel balls 61. If the sequentially arranged inner spiral grooves 2141 (inner ball channels) are sequentially arranged from one end to the first and second … Nth channels. The inner channels 311 (outer ball channels) arranged in sequence are also arranged as the first channel … Nth channel from the same end. The first curves 41 and the second curves 51 are also sorted from the same end into the first lane … and the second lane …. After the first circulator 40 and the second circulator 50 are assembled as shown in fig. 1, the first curve 41 of the first circulator 40 disposed on the first axial wall 212 of the axial cylinder 21 is correspondingly communicated with the first inner ball channel and the first outer ball channel, and the first second curve 51 of the second circulator 50 disposed on the second axial wall 213 of the axial cylinder 21 is correspondingly communicated with the first inner ball channel and the first outer ball channel. At this time, the first inner ball passage, the first curve 41, the first outer helical ball passage and the first second curve 51 form a first ball circulation passage together. And all the steel balls 61 in one ball circulation group 60 are circulated and rolled in the first ball circulation passage.

In turn, the second first curved path 41 is correspondingly communicated with the second inner ball channel and the second outer ball channel, and the second curved path 51 is correspondingly communicated with the second inner ball channel and the second outer ball channel. At this time, the second inner ball passage, the second first curve 41, the second outer helical ball passage and the second curve 51 form a second ball circulation passage together. And all the steel balls 61 in the other ball circulation group 60 are circulated and rolled in the second ball circulation passage.

With the above structure, by providing the first circulator 40 and the second circulator 50 on the axial cylinder 21, the inner spiral channel 2141 on the inner annular wall 214 of the axial cylinder 21 and the inner channel 311 on the inner circumferential wall 31 can be communicated through the first circulator 40 and the second circulator 50. Meanwhile, the ball circulation group 60 can be more smoothly moved from the inner spiral groove 2141 to the inner groove 311 during rolling.

Meanwhile, as shown in fig. 2 and 3, a plurality of sets of ball circulation channels are present in the present embodiment. However, in practical use, the number of the ball circulation sets can be freely matched according to the requirements of light and heavy loads. For example, if desired, only two ball circulation sets may be provided in two of the ball circulation passages, or more ball circulation sets may be provided, or the entire split nut 20 and split shroud 30 may be provided in full rows, thereby achieving a light-to-heavy duty.

Next, referring to fig. 2 and fig. 3, a ball circulation set 60 is exploded to show the arrangement of the balls 61 of the ball circulation set 60 in the ball circulation channel. The ball circulation group 60 circulates in a ring shape along the inner ball passage, the first curve 41, the outer spiral ball passage and the second curve 51, and circulates in a separate ball circulation passage. In practical applications, as shown in fig. 2 and 3, a plurality of ball circulation sets 60 may be provided, and each ball circulation set 60 may roll continuously only in the ball circulation channel provided therein.

With the above structure, since the axial cylinder 21 of the split nut 20 has the axial opening 211, when the split nut 20 moves on the guide 10, even if an additional support member (e.g. a support seat, not shown) is disposed below the guide 10, the split nut 20 can pass through the support member via the axial opening 211 without interfering with the support member. Thus, there is no need to provide a retraction mechanism on the support assembly, so that the support assembly is retracted away from the guide 10 when the generally cylindrical ball nut is about to pass. And when the split nut 20 passes through the supporting component, the supporting component can maintain the state of supporting the guide 10 without causing the problem that the manufacturing precision is affected when the guide 10 is actually applied in the manufacturing process because the guide 10 is drooped and deformed.

As can be seen from fig. 2 and 3, in the present embodiment, a plurality of ball circulation passages and a plurality of ball circulation groups 60 are respectively and correspondingly arranged, and each ball circulation group 60 independently circulates and rolls in the arranged ball circulation passage.

In another embodiment, two ends of the first curved path 41 may be respectively and correspondingly communicated with one inner ball channel and the other outer ball channel, and two ends of the second curved path 51 may be respectively and correspondingly communicated with one inner ball channel and the other outer ball channel. For example, one end of the first curved path 41 may be connected to the inner spiral channel 2141 located at the first path, and the other end may be connected to the inner channel 311 located at the third path, instead of being connected to the inner channel 311 also located at the first path. The two ends of the second curved channel 51 are connected to the first curved channel 41, one end is connected to the inner spiral channel 2141 of the first channel, and the other end is connected to the inner channel 311 of the third channel. This can be achieved by adjusting the inclination of the first bend 41 and the second bend 51.

For example, if the first curved path 41 is disposed obliquely with respect to the short side of the first circulator 40 and the second curved path 51 is disposed obliquely with respect to the short side of the second circulator 50, the inner spiral channel 2141 can communicate with the inner channels 311 of different paths by adjusting the inclination of the first curved path 41 and the second curved path 51, so as to achieve the effect of skipping paths.

Thus, the first inner ball passage, the first curve 41, the third outer ball passage and the first second curve 51 form a third ball circulation passage. The ball circulation group 60 disposed in the third ball circulation passage circulates and rolls in the first inner ball passage, the first curve 41, the third outer ball passage, and the first second curve 51. Therefore, by means of the arrangement of different circulators, the inner ball channels and the outer ball channels in different channels can be matched to form independent ball circulation channels in different combinations. Therefore, the user can flexibly match heavy load or light load.

In the present embodiment, since the inner spiral groove 2141 and the inner groove 311 are spiral grooves having the same spiral angle, the short sides of the first bend 41 and the first circulator 40 are disposed in parallel, and the short sides of the second bend 51 and the second circulator 50 are disposed in parallel. Since both the first circulator 40 and the second circulator 50 have the same structure, only the second circulator 50 is illustrated in fig. 5 as an example. As can be more clearly understood from the top view of fig. 5, when there are a plurality of second curves 51 of the second circulator 50, each of the second curves 51 is disposed parallel to each other and is disposed vertically from top to bottom, i.e., is disposed parallel to the short side of the second circulator 50. Similarly, the first curve 41 is plural, and the first curves 41 will be arranged in parallel with each other. If the first circulator 40 is moved to the same view angle as the second circulator 50, i.e. the opening is at the top, the first bend 41 is also arranged from the top to the bottom, i.e. parallel to the short side of the first circulator 40. Thereby, it is more convenient to position the direction to be milled when the first curve 41 is to be formed on the first circulator 40 or the second curve 51 is to be formed on the second circulator 50. Or when the first circulator 40 or the second circulator 50 is manufactured by injection molding, the mold can be easily manufactured and demolded.

In addition, in the present embodiment, the balls 61 provided in the ball circulation guide device can roll in the respective independent ball circulation passages without falling out of the ball circulation passages, without providing a separate ball retainer, under the limit of the ball circulation passages formed by the guide 10, the open nut 20, the open shroud 30, the first circulator 40, and the second circulator 50. However, in other embodiments, the plurality of steel balls 61 in the ball circulation group 60 may be connected in series by providing a ball retainer.

Referring to fig. 6 to 9, fig. 6 is an exploded view of a ball circulation guide device according to a second embodiment of the present invention, fig. 7 is an exploded view of the ball circulation guide device according to the second embodiment of the present invention from another perspective, fig. 8 is a bottom view of an opening sleeve according to the second embodiment of the present invention, and fig. 9 is a top view of a second circulator according to the second embodiment of the present invention. In this embodiment, the same reference numerals are used for the same parts as those in the first embodiment, and the description thereof is omitted.

First, the present embodiment is different from the first embodiment in that a plurality of open-mouthed shrouds 30a (2 are shown as an example in fig. 6) are provided at intervals, and the ball circulation group 60a is provided only at the position where the open-mouthed shroud 30a is provided. In addition, in the present embodiment, the inner circumferential wall 31a of the open-mouthed shroud 30a is formed with an inner groove 311a, and the outer circumferential wall 215 of the axial cylinder 21 is a plane, so that the inner groove 311a and the outer circumferential wall 215 of the axial cylinder 21 together form an outer ball passage.

However, the inner channel 311a of the present embodiment is different from the first embodiment. Referring to fig. 6 to 8, in the present embodiment, the outer ball channel is perpendicular to the central axis C. As shown in fig. 8, the inner groove 311a as the outer ball passage in this embodiment is an inner groove 311a circumferentially arranged on the inner circumferential wall 31a in the radial direction, and it is clear from the bottom view that the groove direction of each inner groove 311a is the up-down direction shown on the drawing (the pattern of the inner groove 311a is commonly referred to as a straight groove). The inner channel 311a and the central axis C are projected in the upward direction, and in the planar projection formed in the upward direction, the inner channel 311a and the central axis C are perpendicular to each other, that is, an included angle a1 between the two is a right angle. Similarly, if the inner groove 311a and the central axis C are projected in the above-mentioned top view direction P, the inner groove 311a and the central axis C are perpendicular to each other in a planar projection formed in the top view direction P, that is, an angle between the inner groove and the central axis C is a right angle.

In addition, as is clear from fig. 6 and 7, the first circulator 40a is plural, and the second circulator 50a is plural. In the present embodiment, the first circulator 40a is shown in two and the second circulator 50a is shown in two in order to match the number of the open shrouds 30 a. Two first circulators 40a would be disposed on the first axial wall 212 corresponding to the split shroud 30 a. The first circulator 40a includes a first curved path 41a, and both ends of the first curved path 41a are respectively and correspondingly communicated with the inner spiral channel 2141 (inner ball passage) and the inner channel 311a (outer ball passage). Two second circulators 50a are disposed on the second axial wall 213 corresponding to the open shroud 30 a. The second circulator 50a includes a second curved path 51a, and two ends of the second curved path 51a are respectively and correspondingly communicated with the inner spiral channel 2141 (inner ball channel) and the inner channel 311a (outer ball channel). By the first circulator 40a and the second circulator 50a which can be provided in correspondence with the hatch cover 30a, the first circulator 40a, and the second circulator 50a can be modularized, and a required number of hatch covers 30a, the first circulator 40a, and the second circulator 50a can be provided at a required position of the hatch nut 20.

Further, the first circulator 40a and the second circulator 50a can be miniaturized and applied in a wider range. For example, the first circulator 40a and the second circulator 50a in the present embodiment may also be disposed in the structure of the longer open shroud 30 shown in the first embodiment. The same structure and effect can be achieved by providing a plurality of first circulators 40a and second circulators 50 a.

Next, referring to fig. 9, another difference between the present embodiment and the first embodiment is that in the present embodiment, the first curve 41a is disposed obliquely with respect to the short side of the first circulator 40a, and the second curve 51a is disposed obliquely with respect to the short side of the second circulator 50 a. Since the first circulator 40a and the second circulator 50a have the same structure, only the second circulator 50a will be described as an example in fig. 9. As can be more clearly understood from the top view of fig. 9, when the second loop 51a of the second circulator 50a is multiple, the second loops 51a are arranged in parallel and are inclined from top to bottom in the drawing from right to left. Similarly, the first curved path 41a is plural, and the first curved paths 41a will be arranged in parallel with each other. If the first circulator 40a is moved to the same viewing angle as the second circulator 50a, i.e., the opening is at the top, the first bend 41a is also obliquely disposed from right to left from top to bottom.

Although the present invention has been described with reference to the foregoing embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.