End-side circulator, ball screw, and electric cylinder

Abstract

The utility model provides an end side circulator, a ball screw, and an electric cylinder. The end side circulator comprises a main body part and a positioning block; the main body part comprises a first surface, a second surface and a third surface, and every two of the first surface, the second surface and the third surface intersect; the positioning block protrudes out of the third surface; a first port is formed in the surface, opposite to the third surface, of the positioning block, a second port is formed in the second surface, and an end side circulator channel is formed in the first surface; and the end side circulator channel penetrates through the main body part and the positioning block to communicate the first port with the second port. The end side circulator and the ball screw can be compact, the machining difficulty is reduced, and the machining precision is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of linear actuators, in particular to an end-side circulator, a ball screw comprising the end-side circulator, and an electric cylinder. BACKGROUND

[0002] A ball screw is a main component of an electric cylinder, and its principle is to convert rotary motion into linear motion through the circulation of balls between a screw rod and a nut. In a reverse ball screw, the rotation of the nut drives the linear motion of the screw rod, and the balls are arranged on the screw rod and circulate in the screw rod. In application scenarios where the size of the screw rod is small, the screw rod needs to be precisely machined, and the machining and assembly precision requirements are very high. Therefore, in the case where the balls need to circulate in the screw rod, how to reduce the machining difficulty of the screw rod has become a problem to be solved. SUMMARY

[0003] The present disclosure provides an end-side circulator, a ball screw, and an electric cylinder.

[0004] In a first aspect, the present disclosure provides an end-side circulator, comprising a main body and a positioning block; the main body comprises a first surface, a second surface, and a third surface, the first surface, the second surface, and the third surface intersect with each other; the positioning block protrudes from the third surface; a first port is arranged on the surface of the positioning block relative to the third surface, a second port is arranged on the second surface, and an end-side circulator channel is arranged on the first surface; the end-side circulator channel penetrates through the main body and the positioning block, and connects the first port and the second port.

[0005] In some embodiments, the end-side circulator channel is an arc-shaped groove, and the radius of curvature of the arc-shaped groove is greater than or equal to the width of the arc-shaped groove.

[0006] In some embodiments, the main body further comprises a protruding wing arranged on at least one side of the second port, and the protruding wing protrudes from the first surface.

[0007] In some embodiments, the main body comprises two protruding wings, one protruding wing is arranged on each side of the second port, and the thickness of the protruding wing arranged on the side away from the third surface is greater than the thickness of the protruding wing arranged on the side close to the third surface.

[0008] In some embodiments, the main body comprises one protruding wing, and the protruding wing is arranged on the side of the second port away from the third surface; the thickness of the side wall of the second port away from the third surface is greater than the thickness of the side wall of the second port close to the third surface.

[0009] In some embodiments, a ball return shovel is arranged at the second port for guiding the ball into the end-side circulator channel.

[0010] In some embodiments, the main body further comprises a fourth surface opposite to the first surface, the ball return shovel comprises a connecting portion and a shovel portion, the connecting portion is connected with the fourth surface, and the shovel portion extends from the connecting portion to above the second port.

[0011] In some embodiments, the positioning block is arranged with a hollow hole on the surface coplanar with the first surface; and / or the first surface of the main body is arranged with a hollow hole.

[0012] In some embodiments, the material of the end-side circulator comprises any one of plastic, resin, and metal.

[0013] In the second aspect, the embodiments of the present disclosure provide a ball screw, comprising a nut, a screw rod, and balls, the nut is arranged with a first spiral channel, the screw rod is arranged with a second spiral channel, the inside of the screw rod is arranged with a ball return channel, the ball return channel penetrates the screw rod along the axial direction; the ball screw further comprises two end-side circulators according to the first aspect of the embodiments of the present disclosure, the two end-side circulators are arranged at the two ends of the screw rod respectively; the two ends of the ball return channel are respectively arranged with positioning grooves, the positioning blocks of the end-side circulators are fitted and installed in the positioning grooves, the first port of the end-side circulator is engaged with the ball return channel, the second port of the end-side circulator is engaged with one end of the second spiral channel, the ball return channel, the second spiral channel, and the end-side circulator channels in the two end-side circulators constitute a continuous circulating rolling track, and the balls are arranged in the circulating rolling track.

[0014] In some embodiments, the screw rod is arranged with mounting grooves at the two ends, the shapes of the mounting grooves match the shapes of the main bodies of the end-side circulators, and the positioning grooves are arranged in the mounting grooves; the end-side circulators are installed in the mounting grooves.

[0015] In the third aspect, the embodiments of the present disclosure provide an electric cylinder, comprising the ball screw and a driver as described above.

[0016] The end-side circulator according to the embodiments of the present disclosure has a simple structure, can reduce the volume of components, is manufactured by using a simple mold such as a coreless mold, and can realize a compact circulation system. Meanwhile, in the end-side circulator according to the embodiments of the present disclosure, the two ports of the end-side circulator channel are arranged on two intersecting surfaces, the movement direction of the ball changes in the end-side circulator, and the shape structure of the end-side circulator and the end-side circulator channel enables the end-side circulator to be installed at both ends of the screw rod, only a ball return channel that penetrates through both ends of the screw rod needs to be arranged in the screw rod, and the end-side circulator can guide the ball to circulate and roll in the spiral channel on the outer circumferential surface of the screw rod and the ball return channel, without the need to additionally arrange a channel that connects the spiral channel on the outer circumferential surface of the screw rod and the ball return channel on the screw rod. The end-side circulator according to the embodiments of the present disclosure can be applied to an application scenario in which the size of the screw rod is small, can realize the compactness of the ball screw, and is beneficial to reducing the processing difficulty and improving the processing precision. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of a ball screw according to an embodiment of the present disclosure;

[0018] Figure 2 is a perspective view of a screw rod according to an embodiment of the present disclosure;

[0019] Figure 3 is a cross-sectional view of a ball return channel and an end-side circulator channel according to an embodiment of the present disclosure;

[0020] Figure 4 is a perspective view of an end-side circulator according to an embodiment of the present disclosure;

[0021] Figure 5 is a perspective view of another end-side circulator according to an embodiment of the present disclosure;

[0022] Figure 6 is a side view of a screw rod according to an embodiment of the present disclosure.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1, ball screw; 10, nut; 11, screw rod; 12, ball; 13, second spiral channel; 14, first spiral channel; 15, end-side circulator; 150, main body part; 151, first port; 152, second port; 153, positioning block; 154, ball returning shovel; 155, protruding wing; 156, protruding wing; 157, end-side circulator channel; 158, hollow hole; 160, hollow hole; 16, push rod; 171, positioning groove; 172, mounting groove; 18, ball return channel; 101, first surface; 102, second surface; 103, third surface. DETAILED DESCRIPTION

[0025] In order for those skilled in the art to better understand the technical solutions of the present disclosure, the technical solutions of the present disclosure will be described in detail below with reference to the drawings.

[0026] In the following, example embodiments will be described more fully with reference to the accompanying drawings, in which, however, some embodiments can be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, the aim of the embodiments is to explain the present disclosure in detail and to fully convey the scope of the present disclosure to those skilled in the art.

[0027] The embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0028] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the terms "comprising" and / or "consisting of" when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0030] The embodiments described herein can be described with reference to plan views and / or cross-sectional views by virtue of the idealized schematic illustrations of the present disclosure. Thus, the example illustrations can be modified according to manufacturing techniques and / or tolerances. Therefore, embodiments are not limited to the illustrated examples in the drawings, but include modifications based on manufacturing processes. Thus, the zones illustrated in the drawings have schematic properties and the shapes of the zones shown in the drawings illustrate specific shapes of zones of elements, but are not intended to be limiting.

[0031] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0032] Figure 1 is a perspective view of a ball screw in an embodiment of the present disclosure, Figure 2 is a perspective view of a ball screw in an embodiment of the present disclosure, Figure 3 is a cross-sectional view of a ball return passage and an end-side circulator channel in an embodiment of the present disclosure, Figure 4 is a perspective view of an end-side circulator in an embodiment of the present disclosure. Reference is made toFigure 1 、 Figure 2 、 Figure 3 、 Figure 4 The ball screw 1 comprises a nut 10 and a screw rod 11. The nut 10 has a first helical groove 14 therein, and the screw rod 11 has a second helical groove 13 thereon, and a ball 12 is arranged in the second helical groove 13, and the first helical groove 14 is engaged with the ball in the second helical groove 13. End-side circulators 15 are arranged at both ends of the screw rod 11, and the end-side circulators 15 are provided with end-side circulator grooves 157, and a ball return channel 18 is arranged inside the screw rod 11. The end-side circulator grooves 157 of the two end-side circulators 15 are communicated with the second helical groove 13 and the ball return channel 18, and form a circulating raceway, and the ball 12 can circulate and roll in the circulating raceway.

[0033] As shown in Figure 1 , the ball screw 1 is a reverse ball screw, and in operation, the nut 10 is driven to rotate, and the ball 12 rolls between the first helical groove 14 and the second helical groove 13. Since the second helical groove 13 is a helical groove that is continuously and throughly formed, when the ball 12 rolls in the second helical groove 13, the ball 12 will roll along the helical groove from the entrance of the second helical groove 13 to the exit of the second helical groove 13. When the ball 12 rolls to the exit of the second helical groove 13, the end-side circulator 15 arranged at the exit of the second helical groove 13 guides the ball 12 into the ball return channel 18 through the end-side circulator groove 157, and the ball 12 returns to the entrance of the second helical groove 13 along the ball return channel 18, and then the end-side circulator 15 arranged at the entrance of the second helical groove 13 guides the ball 12 into the second helical groove 13 through the end-side circulator groove 157, so that the ball 12 circulates and rolls in the circulating raceway. With the rotation of the nut 10, the screw rod 11 moves linearly under the engagement of the ball 12 with the first helical groove 14 and the second helical groove 13. In some embodiments, as shown in Figure 1 , the screw rod 11 is connected with a push rod 16, and the push rod 16 is connected with a load. The nut 10 drives the screw rod 11 to move linearly, and drives the push rod 16 and the load connected with the push rod 16 to move.

[0034] It should be noted that the entrance and the exit of the second helical groove 13 are not specially limited in the embodiments of the present disclosure. According to the rolling direction of the ball 12, one end of the second helical groove 13, through which the ball 12 enters from the end-side circulator 15, is the entrance, and the other end of the second helical groove 13, through which the ball 12 enters from the end-side circulator 15, is the exit. With the change of the rotation direction of the nut 10, the rolling direction of the ball 12 will also change, and the entrance and the exit of the second helical groove 13 will also be exchanged accordingly.

[0035] Figure 4is a structural schematic diagram of an end-side circulator in an embodiment of the present disclosure, Figure 5 is a structural schematic diagram of another end-side circulator in an embodiment of the present disclosure.

[0036] The end-side circulator 15 in the embodiments of the present disclosure will be explained and described below. Figure 4 , Figure 5 The end-side circulator 15 in the embodiments of the present disclosure will be explained and described below.

[0037] As shown in Figure 4 , Figure 5 , the end-side circulator 15 includes a main body 150, which includes a first surface 101, a second surface 102, and a third surface 103, and the first surface 101, the second surface 102, and the third surface 103 intersect with each other. The end-side circulator 15 further includes a positioning block 153, which protrudes from the third surface 103 and is arranged on one side of the main body 150. In some embodiments, the end-side circulator 15 is in an L shape as a whole.

[0038] As shown in Figure 4 , Figure 5 , the positioning block 153 is provided with a first port 151 on the surface opposite to the third surface 103, the second surface 102 is provided with a second port 152, and the first surface 101 is provided with an end-side circulator channel 157, which penetrates through the main body 150 and the positioning block 153 and connects the first port 151 and the second port 152. After the end-side circulator 15 is installed on the lead screw 11, the first port corresponds to the ball return channel 18 inside the lead screw 11, and the second port 152 corresponds to the second spiral groove 13 on the outer circumferential surface of the lead screw 11. According to the rolling direction of the ball 12 in the circulating track, the ball 12 can enter the end-side circulator channel 157 from the first port 151 or the second port 152.

[0039] In some embodiments, the second surface 102 and the third surface 103 are perpendicular, and the surface of the positioning block 153 opposite to the third surface 103 is parallel to the third surface 103.

[0040] As shown in Figure 4 , Figure 5As shown, the first port 151 and the second port 152 are respectively arranged on two intersecting surfaces, and the opening direction of the first port 151 and the opening direction of the second port 152 are intersected. When the ball 12 enters the end-side circulator channel 157 from the first port 151 and then exits the end-side circulator channel 157 from the second port 152, or enters the end-side circulator channel 157 from the second port 152 and then exits the end-side circulator channel 157 from the first port 151, the movement direction of the ball 12 is changed. The shape structure of the first port 151, the second port 152, and the end-side circulator channel 157 in the end-side circulator 15 ensures that the end-side circulator 15 can guide the ball 12 from the second spiral channel 13 to the ball return channel 18 inside the screw rod 11, and can guide the ball 12 from the ball return channel 18 to the second spiral channel 13. At the same time, the shape structure of the end-side circulator 15 and the end-side circulator channel 157 enables the end-side circulator 15 to be installed at both ends of the screw rod 11, without the need to open a channel on the screw rod 11 to communicate the second spiral channel 13 with the ball return channel 18, which is conducive to reducing the machining difficulty of the screw rod 11.

[0041] As shown in Figures 1 to 5 , the positioning block 153 is used to position the end-side circulator 15 when the end-side circulator 15 is installed on the screw rod 11, and ensures that the end-side circulator channel 157 is in alignment with the ball return channel 18. Positioning grooves matched with the positioning block 153 are arranged at both ends of the ball return channel 18 of the screw rod 11, and the positioning block 153 of the end-side circulator 15 is engaged into the positioning grooves of the screw rod 11 when the end-side circulator 15 is installed into the screw rod 11. Referring to Figure 4 、 Figure 5 , the positioning block 153 protrudes in the width direction of the end-side circulator channel 157. Specifically, on the side of the first port 151, the side wall of a certain length of the end-side circulator channel 157 extends in the width direction of the end-side circulator channel 157 to form the positioning block 153 protruding from the third surface 103.

[0042] In some embodiments, as shown in Figure 4 、 Figure 5 , a hollow hole 158 is formed in the positioning block 153, which can be triangular, circular, or other shapes. The present disclosure does not make special limitations on this. The hollow hole 158 arranged on the positioning block 153 can save materials while ensuring the supporting strength of the positioning block 153, which is conducive to making the end-side circulator 15 and other components more lightweight.

[0043] In some embodiments, as shown in Figure 4 、 Figure 5As shown, a hollow hole 160 is also formed on the main body part 150 of the end-side circulator 15, which can be triangular, circular or other shapes. The hollow hole 160 is provided on the main body part 150, which can save materials while ensuring the support strength of the main body part 150, and is conducive to making the end-side circulator 15 and other components more lightweight.

[0044] The shape of the end-side circulator channel 157 is not particularly limited in the embodiments of the present disclosure.

[0045] In some embodiments, the radius of curvature of the geometric shape of the end-side circulator channel 157 can withstand the Hertz pressure related to the speed of the ball, so that the ball can roll at high speed in the end-side circulator channel 157.

[0046] In some embodiments, as shown in Figure 4 , Figure 5 The shape of the end-side circulator channel 157 is an arc-shaped groove, and the radius of curvature of the arc-shaped groove is greater than or equal to the width of the arc-shaped groove. In the embodiments of the present disclosure, the width of the arc-shaped groove matches the diameter of the ball 12, and the radius of curvature of the arc-shaped groove of the end-side circulator channel 157 satisfies greater than the diameter of the ball 12. Such structure of the end-side circulator channel 157 can effectively prevent the ball 12 from being stuck in the end-side circulator channel 157, thereby ensuring that the ball rolls at high speed and smoothly in the end-side circulator channel 157.

[0047] As shown in Figure 4 , Figure 5 A ball return shovel 154 is provided on the side of the second port 152 of the end-side circulator channel 157, which is used for path guiding of the ball, so that the ball 12 rolled from the second spiral channel 13 to the end-side circulator channel 157 falls into the end-side circulator channel 157 correctly. When the ball screw works, the ball 12 moves at high speed, and due to the centrifugal effect caused by inertia, the ball 12 has a tendency to deviate from the channel. The setting of the ball return shovel 154 can inhibit the centrifugal effect caused by inertia, so that the ball 12 falls into the channel correctly.

[0048] As shown in Figure 4 , Figure 5 The main body part 150 also includes a fourth surface opposite to the first surface 101, and the ball return shovel 154 includes a connecting part and a shovel-shaped part, the connecting part is connected with the fourth surface, and the shovel-shaped part extends above the second port 152 from the connecting part. In other words, on the side of the second port 152 of the end-side circulator channel 157, the bottom wall of the end-side circulator channel 157 extends and rises towards the side of the channel, forming a shovel shape, thereby forming the ball return shovel 154.

[0049] As shown in Figure 4 , Figure 5As shown, the main body 150 also includes a protruding wing disposed on at least one side of the second port 152, the protruding wing protruding from the first surface 101. The protruding wing can fix the rolling trajectory of the ball 12, ensuring that the ball 12 rolls smoothly between the second helical channel 13 and the end-side circulator channel 157.

[0050] Figure 4 This is a schematic diagram of an end-side circulator with protruding wings on both sides of the second port 152. Figure 4 As shown, protruding wings 155 and 156 are respectively provided on both sides of the second port 152. The protruding wings 155 and 156 can be regarded as extensions of the sidewalls at the end of the end-side circulator channel 157.

[0051] In such Figure 4 In the end-side circulator 15 shown, the thicknesses of the protruding wing 155 and the protruding wing 156 can be the same or different. For example, research has found that due to the centrifugal force of the ball 12 rolling in the groove, the protruding wing 156 on the side away from the third surface 103 will bear greater pressure in actual use and is more prone to damage during transportation and assembly. Therefore, the protruding wing 156 on the side away from the third surface 103 can be thickened, making the thickness of the protruding wing 156 greater than that of the protruding wing 155, thereby strengthening the protruding wing 156 and improving its reliability. In the embodiments of this disclosure, when thickening the protruding wing 156, the main body 150 can be thickened. Figure 4 The side wall on the left side of the middle section is thickened overall.

[0052] Figure 5 This is a schematic diagram of an end-side circulator with a protruding wing only on one side of the second port 152. Figure 5 As shown, the protruding wing 156 is disposed on the side of the second port 152 away from the third surface 103. In... Figure 5 In the end-side circulator 15 shown, the protruding wing 156 can also be thickened to enhance its strength and improve its reliability. In this embodiment, when thickening the protruding wing 156, the main body 150 can be thickened. Figure 5 The side wall on the left side of the middle section is thickened overall.

[0053] The embodiments disclosed herein do not impose any special limitations on the material of the end-side circulator. For example, the circulator can be made of materials such as metal, resin, or plastic.

[0054] The embodiments disclosed herein do not impose any special limitations on the manufacturing process of the end-side circulator. For example, the end-side circulator can be manufactured using molding processes including but not limited to injection molding, casting, powder metallurgy, and 3D printing.

[0055] In some embodiments, the material of the end-side circulator is plastic. In some embodiments, the end-side circulator is processed by an injection molding process. In the embodiments of the present disclosure, the end-side circulator is of an open structure, so that the end-side circulator can be processed by batch injection molding, which is conducive to further reducing the processing difficulty and cost.

[0056] Figure 6 Figure 1 is a side view of a ball screw in the embodiments of the present disclosure. The following will be described in combination with Figure 6 The ball screw in the embodiments of the present disclosure is explained and described.

[0057] As shown in Figure 1 , Figure 2 , the ball screw 1 comprises a nut 10, a screw rod 11, and balls 12. The nut 10 is provided with a first spiral groove 14. The outer circumferential surface of the screw rod 11 is provided with a second spiral groove 13. The inside of the screw rod 11 is provided with a ball return channel 18, which penetrates the screw rod 11 in the axial direction.

[0058] The ball screw 1 further comprises two end-side circulators 15, which are respectively arranged at the two ends of the screw rod 11. As shown in Figure 6 , the two ends of the ball return channel 18 are respectively provided with positioning grooves 171. The positioning blocks 153 of the end-side circulators 15 are fitted and arranged in the positioning grooves 171. The first port 151 of the end-side circulator is in alignment and engagement with the ball return channel 18. The second port 152 of the end-side circulator 15 is in alignment and engagement with one end of the second spiral groove 13. The ball return channel 18, the second spiral groove 13, and the end-side circulator channel 157 of the two end-side circulators 15 constitute a continuous circulating raceway. The balls 12 are arranged in the circulating raceway.

[0059] As shown in Figure 6 , the two ends of the screw rod 11 are provided with mounting grooves 172, the shape of which matches the shape of the main body part 150 of the end-side circulator 15. The positioning grooves 171 are arranged in the mounting grooves 172. The end-side circulator 15 is mounted in the mounting grooves 172.

[0060] When the end-side circulator 15 is mounted on the screw rod 1, the positioning blocks 153 are clamped into the positioning grooves 171 at the ends of the screw rod 11. The main body part 150 is clamped into the mounting grooves 172 at the ends of the screw rod 11. The end-side circulator channel 157 in the end-side circulator 15 is embedded with the ball return channel 18. The protruding wings 155 and / or the protruding wings 156, and the ball returning shovel 157 are located in the second spiral groove 13, and the end-side circulator channel 157 is embedded with the second spiral groove 13.

[0061] The embodiments of the present disclosure also provide an electric cylinder, which comprises the ball screw 1 provided by the embodiments of the present disclosure and a driver for driving the ball screw 1 to operate.

[0062] In a reverse ball screw, the driver is used to drive the nut to rotate, which in turn drives the screw to make linear motion.

[0063] The end-side circulator according to the embodiments of this disclosure has a simple structure, can reduce the size of components, and can be manufactured using simple molds such as coreless casting molds, thus achieving a compact circulation system. The end-side circulator of the embodiments of this disclosure can be applied to applications where the ball screw size is small, and can achieve compactness of the end-side circulator and the ball screw, which is beneficial to reducing the processing difficulty and improving the processing accuracy.

[0064] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in connection with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.

Claims

1. An end-side circulator (15), characterized in that, The end-side circulator (15) includes a main body (150) and a positioning block (153); the main body (150) includes a first surface (101), a second surface (102), and a third surface (103), the first surface (101), the second surface (102), and the third surface (103) intersect each other; the positioning block (153) protrudes from the third surface; The positioning block (153) has a first port (151) on the surface of the third surface (103), a second port (152) is provided on the second surface (102), and an end-side circulator channel (157) is provided on the first surface (101). The end-side circulator channel (157) passes through the main body (150) and the positioning block (153), connecting the first port (151) and the second port (152).

2. The end-side circulator according to claim 1, characterized in that, The end-side circulator channel (157) is an arc-shaped groove, and the radius of curvature of the arc-shaped groove is greater than or equal to the width of the arc-shaped groove.

3. The end-side circulator according to claim 1, characterized in that, The main body (150) also includes a protruding wing disposed on at least one side of the second port (152), the protruding wing protruding from the first surface.

4. The end-side circulator according to claim 3, characterized in that, The main body (150) includes two protruding wings, one of which is provided on each side of the second port (152). The thickness of the protruding wing provided on the side away from the third surface (103) is greater than the thickness of the protruding wing provided on the side closer to the third surface (103).

5. The end-side circulator according to claim 3, characterized in that, The main body includes a protruding wing disposed on the side of the second port (152) away from the third surface (103); the thickness of the sidewall of the second port away from the third surface (103) is greater than the thickness of the sidewall of the second port close to the third surface (103).

6. The end-side circulator according to any one of claims 1 to 5, characterized in that, A ball return shovel (154) is provided at the second port (152) for guiding the ball (12) into the end-side circulator channel (157).

7. The end-side circulator according to claim 6, characterized in that, The main body (150) also includes a fourth surface opposite to the first surface (101), and the ball return shovel (154) includes a connecting part and a shovel-shaped part. The connecting part is connected to the fourth surface, and the shovel-shaped part extends from the connecting part to above the second port (152).

8. The end-side circulator according to any one of claims 1 to 5, characterized in that, The positioning block (153) has a hollow hole (158) on its surface that is coplanar with the first surface (101); and / or A hollow hole (160) is provided on the first surface (101) of the main body (150).

9. The end-side circulator according to any one of claims 1 to 5, characterized in that, The material of the end-side circulator includes any one of plastic, resin, and metal.

10. A ball screw (1), comprising a nut (10), a screw (11), and balls (12), wherein the nut (10) has a first helical groove (14), and the screw (11) has a second helical groove (13), characterized in that, The lead screw (11) is provided with a ball return channel (18) inside, and the ball return channel (18) passes through the lead screw (11) in the axial direction; The ball screw (1) further includes two end-side circulators (15) as described in any one of claims 1 to 9, the two end-side circulators (15) being respectively disposed at both ends of the screw (11); the two ends of the ball return channel (18) are respectively provided with positioning grooves, the positioning block (153) of the end-side circulator (15) is fitted in the positioning groove, the first port (151) of the end-side circulator (15) is engaged with the ball return channel (18), the second port (152) of the end-side circulator (15) is engaged with one end of the second helical channel (13), the ball return channel (18), the second helical channel (13), and the end-side circulator channel (157) of the two end-side circulators (15) constitute a connected circulating raceway, and the ball (12) is disposed in the circulating raceway.

11. The ball screw according to claim 10, characterized in that, The lead screw (11) has mounting grooves at both ends. The shape of the mounting groove matches the shape of the main body (150) of the end-side circulator (15). The positioning groove is set in the mounting groove. The end-side circulator (15) is installed in the mounting groove.

12. An electric cylinder, characterized in that, include: The ball screw (1) and driver as described in claim 10 or 11.

Images