An inner channel raceway inner circulating ball screw

Abstract

The application relates to the technical field of ball screws, in particular to an inner-channel raceway inner-circulation ball screw which comprises steel balls, a nut, a screw rod and a ball-returning assembly, the ball-returning assembly comprises a ball-returning pipe and ball-returning blocks, the two ball-returning blocks are distributed on the two sides of the ball-returning pipe along the radial direction of the ball-returning pipe, a main channel is communicated with a secondary channel and forms a ball-returning channel, and the main channel at least comprises a first circular arc section and a second circular arc section which are arranged in tangency; the inner channel is formed in the ball-returning channel through the ball-returning pipe which is embedded in the screw rod, the overall structure is compact, no additional installation space is occupied, the ball-returning pipe which extends along the axial direction makes a single circulation track have multiple turns, the load-carrying capacity of the ball screw is improved, and the ball-returning channel is designed as an S-shaped structure through the two ball-returning blocks which are distributed at an angle, so that there is no right angle or large-amplitude turning in the inner part of the ball-returning channel, the steel balls roll more smoothly, and the rotation of the high-speed steel balls is not inhibited.

Description

Technical Field

[0001] The present invention relates to the technical field of ball screws, and in particular to a ball screw with an inner channel and a raceway and an inner circulation. Background Art

[0002] A ball screw includes a screw, a nut sleeved on the outside of the screw, and a steel ball located between the two. The motion between the screw and the nut is converted by the circular rolling of the steel ball, which generally includes an internal circulation or external circulation mode of the ball.

[0003] Chinese patent publication number CN219299877U discloses a high-speed external circulation ball screw pair, comprising a screw shaft, a ball nut sheathed on the screw shaft, a return hole provided in the ball nut, and a return device provided on each side of the ball nut. This application arranges the return device on the nut. Generally speaking, the greater the center distance between the ball center and the screw axis, the higher the load capacity. However, the installation space of the ball screw is generally limited. Therefore, the nut provided with the return device must be larger in size. In the case of limited installation space, the center distance of the ball screw needs to be reduced, resulting in a reduction in load capacity.

[0004] A Chinese patent with publication number CN215487489U discloses an internal circulation ball screw, including a screw, a nut, several rolling elements and at least one reflux cover. The rolling elements in this application are single-circle circulation. In order to obtain a larger load-bearing capacity, multiple circles of rolling elements need to be set, and corresponding reflux covers need to be set. However, the overall structure of the reflux cover is large, resulting in a large spacing between adjacent rolling elements. Under the condition of limited axial length, the number of rolling elements is small, resulting in a lower load-bearing capacity. At the same time, because a reflux cover is provided on each circle of rolling elements, some rolling elements in each circle of rolling elements do not participate in the load-bearing work, resulting in a lower load-bearing capacity. Therefore, how to improve the load-bearing capacity under limited installation space has become a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in order to solve the problem in the prior art that the overall structure of the external circulation mode is too large to meet the limited installation space and the internal circulation mode has a low load-bearing capacity, an inner channel raceway internal circulation ball screw is provided.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: an inner channel and raceway inner circulation ball screw, comprising:

[0007] Steel balls, having multiple;

[0008] A nut having an inner spiral groove formed on its inner peripheral wall;

[0009] The lead screw has an outer spiral groove formed on its outer peripheral wall, and the inner spiral groove and the outer spiral groove are combined to form a spiral channel for the steel ball to roll;

[0010] And a ball return component, a ball return channel connected to the spiral channel is formed inside the ball return component, the ball return component includes a ball return tube axially arranged inside the screw and forming a main channel, and two ball return blocks connected to the two ends of the ball return tube along the axial direction and formed with secondary channels inside, and the two ball return blocks are distributed on both sides of the ball return tube along the radial direction, the main channel is connected to the secondary channel to form the ball return channel, and the main channel at least includes a first arc segment and a second arc segment arranged tangentially.

[0011] Furthermore, the first arc segment and the second arc segment have opposite curvature directions and the same radius.

[0012] Furthermore, the main channel further includes a first straight line segment connected to an end of the first arc segment away from the second arc segment and tangent to the first arc segment, and a second straight line segment connected to an end of the second arc segment away from the first arc segment and tangent to the second arc segment;

[0013] The secondary channel close to the first arc segment includes at least a first vertical segment coaxially arranged with the first straight segment;

[0014] The secondary channel close to the second arc segment includes at least a second vertical segment coaxially arranged with the second straight segment.

[0015] Furthermore, the ball return tube includes two half tubes that are interlocked with each other and form a main channel therebetween.

[0016] Furthermore, the ball return block includes a ball return portion formed with a secondary channel and a limiting column for plugging and cooperating with the ball return tube to limit the axial and circumferential displacement of the ball return tube.

[0017] Furthermore, a clamping block is protruded from one side of the two half-tubes that are close to each other, and a clamping groove is recessed to be clamped into the clamping block so as to clamp and fix the two half-tubes.

[0018] Furthermore, each half-tube is recessed along one end portion thereof in the axial direction to form a half groove, and the half groove notches on the two half-tubes are opposed to each other and spliced ​​together to form a positioning groove.

[0019] Furthermore, there are at least two clamping blocks, which are diagonally distributed and have different sizes.

[0020] Furthermore, the ball-returning portion includes a helical surface that cooperates with the inner helical groove and abutting side surfaces that extend from both sides of the helical surface and abut against the groove wall of the outer helical groove.

[0021] Furthermore, the ball return assembly is provided in several groups along the axial direction of the lead screw, and the ball return tubes in the several groups of ball return assemblies are integrally formed.

[0022] Beneficial effects of the present invention:

[0023] (1) The present invention forms an inner channel by embedding a ball return tube inside the screw. The overall structure is compact and does not occupy additional installation space. The center distance between the center of the steel ball and the axis of the screw can be increased under limited installation space, thereby improving the load-bearing capacity. At the same time, the ball return tube extending axially enables a single circulating track to have multiple turns, thereby increasing the number of steel balls and further improving the load-bearing capacity of the ball screw. In addition, by utilizing the first arc segment and the second arc segment arranged tangentially, there are no right angles or large turns inside, and the steel ball rolls more smoothly without inhibiting the rotation of the high-speed moving steel ball.

[0024] (2) The present invention uses two half-tubes to buckle together to form the main channel, which can reduce the difficulty of forming the main channel. The ball return block is inserted into the lead screw and the half-tube in sequence, realizing the synchronous fixation of the three, ensuring the position accuracy of the ball return block and the ball return tube, so that the first straight segment is aligned with the first vertical segment, and the second straight segment is aligned with the second vertical segment, and the steel ball rolls more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and examples.

[0026] Figure 1 It is the overall structural diagram of the present invention;

[0027] Figure 2 An exploded view of the present invention;

[0028] Figure 3 is an axial cross-sectional view of the present invention;

[0029] Figure 4 is a radial cross-sectional view of the present invention;

[0030] Figure 5 is a three-dimensional schematic diagram of a half pipe with a clamping block from a first perspective;

[0031] Figure 6 is a three-dimensional schematic diagram of a half pipe with a clamping block from a second perspective;

[0032] Figure 7 It is a front view of a half pipe with a clamping block;

[0033] Figure 8 is a three-dimensional schematic diagram of a half pipe with a snap-in groove;

[0034] Figure 9 This is a three-dimensional schematic diagram of the ball return block from the first perspective;

[0035] Figure 10 This is a three-dimensional schematic diagram of the ball return block from the second perspective;

[0036] Figure 11 It is the cycle diagram of the steel ball of the present invention;

[0037] In the picture:

[0038] 1. Steel ball;

[0039] 2. Nut; 201. Internal spiral groove;

[0040] 3. Screw; 301, external spiral groove; 302, through groove;

[0041] 4. Ball return assembly; 401. Ball return tube; 4011. Half tube; 4012. Limiting hole; 4013. Snap-in block; 4014. Snap-in groove; 4015. Half groove; 4016. Weight reduction groove; 4017. Main channel; 4017a. First arc segment; 4017b. Second arc segment; 4017c. First straight segment; 4017d. Second straight segment; 402. Ball return block; 4021. Ball return portion; 4021a. Helical surface; 4021b. Abutting side; 4022. Limiting column; 4023. Step; 4024. Secondary channel; 4024a. First vertical segment; 4024b. Second vertical segment. DETAILED DESCRIPTION

[0042] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating the basic structure of the present invention only in a schematic manner. They therefore only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0043] like Figures 1-4 As shown, a ball screw with an inner channel and inner raceway circulation includes:

[0044] Steel balls 1, having a plurality of;

[0045] The nut 2 has an inner spiral groove 201 formed on its inner peripheral wall;

[0046] The lead screw 3 is located inside the nut 2 and has an outer spiral groove 301 formed on its outer peripheral wall. The inner spiral groove 201 and the outer spiral groove 301 are combined to form a spiral channel for the steel ball 1 to roll. The steel ball 1 rolls along the spiral channel to convert the rotation of the lead screw 3 into the linear motion of the nut 2 or convert the rotation of the nut 2 into the linear motion of the lead screw 3;

[0047] And a ball return component 4, a ball return channel connected to the spiral channel is formed inside it, the ball return component 4 includes a ball return tube 401 axially passed through the inside of the screw 3 and formed with a main channel 4017 and two ball return blocks 402 connected to the two ends of the ball return tube 401 along its axial direction and formed with secondary channels 4024 inside. The ball return component 4 adopts a split structure, which is formed by assembling the ball return tube 401 and the ball return block 402, which reduces the difficulty of molding, and the two ball return blocks 402 are distributed on both sides of the ball return tube 401 along its radial direction, that is, the two ball return blocks 402 are diagonally distributed.

[0048] The two ball return blocks 402 are not arranged on two adjacent circles of the spiral channel, that is, there are at least two circles of the spiral channel between the two ball return blocks 402, so that more steel balls 1 can be arranged to improve the load-bearing capacity, overcoming the defect of low load-bearing capacity caused by the single-circle circulation adopted in the internal circulation in the prior art. In this embodiment, the ball return channel is arranged inside the screw, that is, the ball return channel is an internal channel, and the nut 2 does not need to have a ball return channel, so that the size of the nut 2 can be reduced. Under limited installation space, the center distance between the center of the steel ball 1 and the axis of the screw 3 can be increased, thereby further improving the load-bearing capacity.

[0049] The main channel 4017 is connected to the auxiliary channel 4024 to form the ball return channel. The two auxiliary channels 4024 are connected to the two ends of the main channel 4017, and the spiral channel and the ball return channel together form a circulating track for the steel ball 1 to roll. The spiral channel is located outside the screw 3 to form an outer channel, and the ball return channel is located inside the screw 3 to form an inner channel. The two diagonally distributed ball return blocks 402 make the two docking interfaces of the ball return channel and the spiral channel also diagonally distributed.

[0050] The main channel 4017 includes at least a first arc segment 4017a and a second arc segment 4017b that are connected and tangentially arranged. The steel ball 1 has less resistance and rolls more smoothly.

[0051] During operation, the nut 2 and the screw 3 are assembled to form a spiral channel, which serves as the outer channel for the rolling of the steel ball 1, and the ball return assembly 4 and the screw 3 are assembled to form a ball return channel, which serves as the inner channel for the rolling of the steel ball 1. The steel ball 1 enters the main channel 4017 from the spiral channel through one of the ball return blocks 402, and enters another ball return block 402 from the main channel 4017 and then enters the spiral channel again to form a cycle, and the first arc segment 4017a and the second arc segment 4017b tangently arranged in the main channel 4017 can reduce the rolling resistance of the steel ball, making it roll more smoothly. In this embodiment, the ball return channel is formed into an inner channel by embedding the ball return tube 401 inside the screw 3. The overall structure is compact and does not occupy additional installation space. The center distance between the center of the steel ball 1 and the axis of the screw 3 is increased under the limited installation space, thereby improving the load-bearing capacity. At the same time, the ball return tube 401 extending axially enables a single circulating track to have multiple turns, thereby increasing the number of steel balls 1 and further improving the load-bearing capacity of the ball screw. In addition, the first arc segment 4017a and the second arc segment 4017b are arranged tangentially to each other, so that there are no right angles or large turns inside, and the steel ball 1 rolls more smoothly without inhibiting the rotation of the high-speed moving steel ball 1.

[0052] In some examples, the first arc segment 4017a and the second arc segment 4017b have opposite bending directions and equal radii, forming a roughly S-shaped structure with no right angles or large turns inside. The steel ball 1 has less resistance and rolls more smoothly, which can meet the requirements of high-speed operation of the steel ball 1.

[0053] In some examples, the main channel 4017 further includes a first straight line segment 4017c connected to the end of the first arc segment 4017a facing away from the second arc segment 4017b and tangent to the first arc segment 4017a, and a second straight line segment 4017d connected to the end of the second arc segment 4017b facing away from the first arc segment 4017a and tangent to the second arc segment 4017b.

[0054] The secondary channel 4024 near the first arc segment 4017a includes at least a first vertical segment 4024a coaxially arranged with the first straight segment 4017c, so that the steel ball 1 can roll in or out smoothly, reducing the resistance of the steel ball 1 and not causing too much impact on the ball return tube 401 and the ball return block 402. The first straight segment 4017c and the first vertical segment 4024a have the same diameter and are interconnected. A first connecting segment connecting the first straight segment 4017c and the first vertical segment 4024a is formed inside the lead screw 3, and the three are coaxially arranged.

[0055] The auxiliary channel 4024 near the second arc segment 4017b includes at least a second vertical segment 4024b coaxially arranged with the second straight segment 4017d, so that the steel ball 1 can roll in or out smoothly, reducing the resistance of the steel ball 1 and not causing too much impact on the ball return tube 401 and the ball return block 402. The second straight segment 4017d and the second vertical segment 4024b have equal diameters and are interconnected. A second connecting segment connecting the second straight segment 4017d and the second vertical segment 4024b is formed inside the screw 3, and the three are coaxially arranged. The auxiliary channel 4024 also includes a transition segment tangent to the first vertical segment 4024a or the second vertical segment 4024b.

[0056] The steel ball 1 enters the secondary channel 4024 of one of the ball return blocks 402 from the spiral channel and enters the main channel 4017 through the first vertical section 4024a, and enters the secondary channel 4024 of another ball return block 402 along the first straight section 4017c, the first arc section 4017a, the second arc section 4017b and the second straight section 4017d in sequence, and finally enters the spiral channel again to form a cycle. The rolling trajectory of the steel ball 1 in the secondary channel 4024 and in the process of rolling from the secondary channel 4024 into or out of the main channel 4017 is relatively smooth, which can reduce the impact on the ball return block 402 and increase the service life of the entire ball screw.

[0057] In some examples, such as Figure 2 As shown, the ball return tube 401 includes two half tubes 4011 that are interlocked and form a main channel 4017 therebetween, that is, a ball return groove is formed on the side of each half tube 4011 that is close to each other, and the two ball return grooves on the two half tubes 4011 are connected to form the main channel 4017. The ball return tube 401 is set in a split manner, which can reduce the difficulty of forming the S-shaped main channel 4017, thereby improving the processing accuracy of the entire structure.

[0058] In some examples, such as Figure 9 and Figure 10 As shown, the ball return block 402 includes a ball return portion 4021 formed with a partial auxiliary channel 4024 and a limit column 4022 for plugging and cooperating with the ball return tube 401 to limit the axial and circumferential displacement of the ball return tube 401. An arc transition is adopted between the auxiliary channel 4024 and the spiral channel. The end of the auxiliary channel close to the spiral channel is a docking interface, and the cross-sectional area of ​​the docking interface is larger than the cross-sectional area of ​​the spiral channel, so that the steel ball 1 can smoothly roll in or out of the ball return channel.

[0059] The screw 3 is provided with an installation cavity extending in the axial direction for the installation of the ball return tube 401. There is a small gap between the ball return tube 401 and the installation cavity. The screw 3 is provided with a through groove 302 which passes through it in the radial direction for the ball return block 402 to pass through. The ball return tube 401 is provided with a limiting hole 4012 for the limiting column 4022 to be inserted. The limiting hole 4012 and the limiting column 4022 are in a small gap fit. The limiting column 4022 enters the limiting hole 4012 from the through groove 302. 12 is used to fix the ball return block 402, the screw 3 and the ball return tube 401, and the three form a whole. The screw 3 limits the radial displacement of the ball return tube 401, and the ball return block 402 limits the circumferential and axial displacement of the ball return tube 401, ensuring the position accuracy of the ball return tube 401 and the ball return block 402, so that the first straight segment 4017c is aligned with the first vertical segment 4024a, and the second straight segment 4017d is aligned with the second vertical segment 4024b.

[0060] In some examples, such as Figure 5-Figure 8 As shown, one side of the two half-tubes 4011 close to each other is respectively protruded with a clamping block 4013 and a recessed clamping groove 4014 for the clamping block 4013 to be clamped into so as to clamp and fix the two half-tubes 4011. The cross-sectional shape of the clamping block 4013 and the clamping groove 4014 can be but not limited to a circle, a waist or a rectangle, etc. There are several clamping blocks 4013 and clamping grooves 4014 and the two correspond one to one. Each clamping block 4013 is clamped into its corresponding clamping groove 4014. Several clamping blocks 4013 can be located on one of the half-tubes 4011, and several clamping grooves 4014 are located on the other half-tube 4011 to complete the fixation of the two half-tubes 4011, or each half-tube 4011 is provided with a clamping block 4013 and a clamping groove 4014.

[0061] In some examples, such as Figure 5-Figure 8 As shown, each half-tube 4011 is recessed at one end along its axial direction to form a half groove 4015, and the half grooves 4015 on the two half-tubes 4011 are opposite to each other to form a positioning groove. When the two half-tubes 4011 are assembled, if the half groove 4015 of one half-tube 4011 is located at one end, and the half groove 4015 of the other half-tube 4011 is located at the other end, the two half-grooves 4015 cannot be assembled, indicating that the assembly direction of the two half-tubes 4011 is incorrect, which can serve as a reminder. When the two half-grooves 4015 are assembled to form the positioning groove, it indicates that the assembly direction is correct, and the operating tool can be inserted into the positioning groove to adjust the circumferential position of the ball tube 401.

[0062] In some examples, such as Figure 5-Figure 8As shown, the number of the clamping blocks 4013 is at least two, and the two clamping blocks 4013 are diagonally distributed and have different sizes. Correspondingly, the two clamping grooves 4014 are also diagonally distributed and have different sizes. The clamping blocks 4013 and the clamping grooves 4014 with the same size can be matched to realize the assembly of the two half-pipes 4011. If the two half-pipes 4011 are assembled in the wrong direction, the clamping blocks 4013 cannot be clamped into the clamping grooves 4014 with different sizes, thereby playing a reminding role.

[0063] In some examples, as shown in Figure 9 and Figure 10 As shown, the ball return part 4021 includes a spiral surface 4021a matched with the inner spiral groove 201 and an abutting side surface 4021b extending from both sides of the spiral surface 4021a and abutting with the groove wall of the outer spiral groove 301. The spiral surface 4021a is also matched with the inner spiral groove 201 in a small gap. The movement of the ball return block 402 in the radial direction outward can be limited by the cooperation of the spiral surface 4021a and the inner spiral groove 201. The movement of the ball return block 402 in the radial direction inward can be limited by the cooperation of the limiting column 4022 and the limiting hole 4012.

[0064] As shown in Figure 5 The ball return pipe 401 is generally in an I-shaped structure, and a weight reduction groove 4016 is formed in the middle part. The weight reduction groove 4016 is beneficial to molding and weight reduction, so as to realize the weight reduction of the overall structure. The cross sections of the two ends of the ball return pipe 401 are matched with the shape of the mounting cavity and are matched in a small gap.

[0065] In some examples, the ball return assembly 4 is provided with a plurality of groups in the axial direction of the lead screw 3. The number of the groups can be, but is not limited to, one group, two groups, or three groups, etc. The plurality of ball return pipes 401 in the plurality of groups of the ball return assembly 4 are integrally formed, thereby improving the structural strength of the ball return assembly 4. In the present embodiment, the number of the ball return assembly 4 is two groups.

[0066] A step 4023 is formed between the ball return part 4021 and the limiting column 4022. The step surface in the slot 302 abuts with the step 4023 to limit the radial displacement of the ball return block 402. The step 4023 is root-processed to avoid interference with the assembly process.

[0067] Working principle:

[0068] During operation, the nut 2 and the lead screw 3 are assembled to form a spiral channel, which serves as an outer channel for the rolling of the steel ball 1, and the ball return assembly 4 and the lead screw 3 are assembled to form a ball return channel, which serves as an inner channel for the rolling of the steel ball 1. The steel ball 1 enters the auxiliary channel 4024 of one of the ball return blocks 402 from the spiral channel, enters the main channel 4017 through the first vertical segment 4024a, and moves along the first straight segment 4017c, the first arc segment 4017a, the second arc segment 4017b and the second straight segment 4017d in sequence, and then enters the auxiliary channel 4024 of another ball return block 402 through the second vertical segment 4024b, and finally enters the spiral channel again to form a cycle, as shown in FIG. Figure 11 As shown; in this embodiment, the ball return channel is formed into an inner channel by embedding the ball return tube 401 inside the screw 3. The overall structure is compact and does not occupy additional installation space. The center distance between the center of the steel ball 1 and the axis of the screw 3 is increased under the limited installation space, thereby improving the load-bearing capacity. At the same time, the ball return tube 401 extending axially enables a single circulating track to have multiple turns, thereby increasing the number of steel balls 1 and further improving the load-bearing capacity of the ball screw. In addition, the first arc segment 4017a and the second arc segment 4017b are arranged tangentially, so that there are no right angles or large turns inside, and the steel ball 1 rolls more smoothly without inhibiting the rotation of the high-speed moving steel ball 1.

[0069] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A ball screw with an inner channel and inner raceway, characterized in that: include: Steel balls (1), having a plurality of; A nut (2), the inner peripheral wall of which is formed with an inner spiral groove (201); A lead screw (3) having an outer spiral groove (301) formed on its outer peripheral wall, and the inner spiral groove (201) and the outer spiral groove (301) are combined to form a spiral channel for the steel ball (1) to roll; and a ball return assembly (4), wherein a ball return channel communicating with the spiral channel is formed inside the ball return assembly (4), the ball return assembly (4) comprising a ball return tube (401) axially arranged inside the lead screw (3) and forming a main channel (4017), and two ball return blocks (402) connected to the two ends of the ball return tube (401) along its axial direction and forming a secondary channel (4024) inside, and the two ball return blocks (402) are distributed on both sides of the ball return tube (401) along its radial direction, the main channel (4017) is communicated with the secondary channel (4024) to form the ball return channel, and the main channel (4017) at least comprises a first arc segment (4017a) and a second arc segment (4017b) arranged tangentially thereto; The ball return tube (401) comprises two half tubes (4011) that are interlocked and form a main channel (4017) therebetween; The ball return block (402) comprises a ball return portion (4021) formed with a partial auxiliary channel (4024) and a limiting column (4022) for plugging and cooperating with the ball return tube (401) to limit the axial and circumferential displacement of the ball return tube (401).

2. The inner channel and inner raceway circulating ball screw according to claim 1, characterized in that: The first arc segment (4017a) and the second arc segment (4017b) have opposite bending directions and the same radius.

3. The inner channel and inner raceway circulating ball screw according to claim 1, characterized in that: The main channel (4017) further comprises a first straight line segment (4017c) connected to the end of the first arc segment (4017a) facing away from the second arc segment (4017b) and tangent to the first arc segment (4017a), and a second straight line segment (4017d) connected to the end of the second arc segment (4017b) facing away from the first arc segment (4017a) and tangent to the second arc segment (4017b); The secondary channel (4024) close to the first arc segment (4017a) comprises at least a first vertical segment (4024a) coaxially arranged with the first straight segment (4017c); The secondary channel (4024) close to the second circular arc segment (4017b) includes at least a second vertical segment (4024b) coaxially arranged with the second straight segment (4017d).

4. The inner channel and inner raceway circulating ball screw according to claim 1, characterized in that: The sides of the two half-tubes (4011) that are close to each other are respectively protruded with a clamping block (4013) and recessed with a clamping groove (4014) for the clamping block (4013) to be clamped in to clamp and fix the two half-tubes (4011).

5. The inner channel and inner raceway circulating ball screw according to claim 1, characterized in that: Each half-tube (4011) is recessed along one end portion thereof in the axial direction to form a half groove (4015), and the half grooves (4015) on the two half-tubes (4011) are opposed to each other and spliced ​​together to form a positioning groove.

6. The inner channel and inner raceway circulating ball screw according to claim 4, characterized in that: There are at least two of the clamping blocks (4013), and the two clamping blocks (4013) are diagonally distributed and have different sizes.

7. The inner channel and inner raceway circulating ball screw according to claim 1, characterized in that: The ball-returning portion (4021) comprises a spiral surface (4021a) cooperating with the inner spiral groove (201) and abutting side surfaces (4021b) extending from both sides of the spiral surface (4021a) and abutting against the groove wall of the outer spiral groove (301).

8. The inner channel and inner raceway circulating ball screw according to claim 1, characterized in that: The ball return components (4) are arranged in a plurality of groups along the axial direction of the lead screw (3), and the plurality of ball return tubes (401) in the plurality of groups of ball return components (4) are integrally formed.

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