Ball screw

Abstract

The utility model provides a ball screw which is applied to the technical field of ball screw transmission, the ball screw comprises a screw and a nut provided with an assembling groove, a backflow device assembly is arranged in the assembling groove, the backflow device assembly comprises a backflow device body embedded in the assembling groove in the axial direction and a positioning piece, and the surface of the positioning piece is provided with a rotation stopping part. The scraping and brushing device assembly comprises a scraping and brushing device body and an annular retainer, wherein the scraping and brushing device body is composed of two detachable semi-annular parts suitable for being arranged on the outer side of the screw in a sleeving mode, a scraping and brushing lip extending into a threaded groove of the screw is formed on the inner circumferential wall of the scraping and brushing device body, and a locking part is arranged on the surface of the annular retainer. Wherein the outer wall of the annular retainer is separably combined with the rotation stopping part so as to limit the circumferential rotation of the retainer in an assembled state, and the locking part is separably combined with the outer wall of the wiper body so as to lock the relative position of the retainer and the wiper body in the assembled state; the ball screw has the advantages of reliable axial positioning of the scraping and brushing device assembly, simple assembly structure, simple and convenient assembly process and high efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of ball screws, and in particular to a ball screw. Background Art

[0002] Conventionally, a scraper is a crucial component of a ball screw, used to remove dust and debris from the thread grooves of the running screw. Existing scraper components are known to have at least two configurations: a single component and a two-component combination. A common problem with single-component scrapers is that they cannot be installed as a whole on a screw without a threaded end. To address this, the industry's common practice is to first cut the scraper into two parts at one point and then forcefully install the scraper on the screw by propping the gap between the two parts. This not only makes installation difficult, but the resulting gap significantly reduces the scraper's dust removal effectiveness.

[0003] The scraper component of the two-component combination form can adapt to the installation of screws of both threaded and unthreaded forms. However, the existing scraper component of the two-component combination form still has the problems of complex installation structure and cumbersome installation process. For example, after searching, the Chinese patent with publication number CN203743359U and publication date 2014-07-30 discloses a combined scraper and a screw device having the combined scraper, wherein the combined scraper includes a scraper ring and a positioning ring, wherein the scraper ring is fixed to the positioning ring by a radial screw member penetrating the side wall of the positioning ring, and the positioning ring is fixed to the combined collar by a plurality of axial screw members, and one end of the combined collar is screwed into the inner cavity of the nut and positioned by a radial screw member. This solution requires the use of a large number of axial screw connectors and radial screw connectors to position the scraper ring during the installation process, which makes the installation process more complicated. In order to achieve axial positioning of the scraper ring, the radial screw connectors used between the combined ring and the nut and between the positioning ring and the scraper ring, as well as the radial screw holes matched with the above-mentioned radial screw connectors, are provided as an installation structure. Not only will it increase the process steps of processing and manufacturing corresponding parts, but it will also make the installation itself difficult.

[0004] To sum up, there are at least the following issues that need to be solved in the prior art. For example, for a scraper in the form of a two-component combination, how to simplify the assembly structure and assembly process of the scraper component to the inside of the nut while ensuring reliable axial positioning of the scraper, thereby improving the assembly efficiency of the ball screw. Utility Model Content

[0005] In view of this, an embodiment of the present specification provides a ball screw having the advantages of reliable axial positioning of the wiper assembly, a simple assembly structure, and a simple and efficient assembly process.

[0006] The embodiments of this specification provide the following technical solutions: a ball screw, comprising a screw, a nut sleeved on the screw and provided with an assembly groove at at least one end, wherein the assembly groove is provided with: a return flow assembly, comprising a return flow assembly axially embedded in the assembly groove and a positioning plate for locking the position of the return flow assembly body and provided with a rotation-stop portion on the surface; a wiper assembly, comprising a wiper body composed of two detachable semi-annular parts suitable for being sleeved on the outside of the screw and having a wiper lip extending into the screw thread groove formed on the inner circumferential wall, and an annular retainer for maintaining the shape of the wiper body and provided with a locking portion on the surface; wherein the annular retainer is configured so that the outer wall can be detachably combined with the rotation-stop portion to limit the circumferential rotation of the retainer in the assembled state, and the locking portion can be detachably combined with the outer wall of the wiper body to be able to lock the relative positions of the retainer and the wiper body in the assembled state.

[0007] To optimize the above plan, the following measures are also taken:

[0008] As a preferred embodiment, the anti-rotation portion is formed by a portion protruding outwardly from the surface of the positioning piece in the axial direction.

[0009] As a preferred embodiment, the positioning piece is provided with at least one locking member for locking the positioning piece at the bottom of the assembly groove, and the anti-rotation portion is formed on the at least one locking member.

[0010] As a preferred embodiment, the locking member is a threaded fastener with a head, the anti-rotation portion is formed on the head of the threaded fastener, and the locking portion is formed on the outer peripheral wall of the annular retainer.

[0011] As a preferred embodiment, the scraper body includes a raised ring portion formed on the inner circumferential wall of the scraper body and having a hardness less than that of the scraper lip, a gap is reserved between the scraper lip and the groove wall of the screw thread groove, and the raised ring portion is constructed so that the inner circumferential wall always passes through the reserved gap in the radial direction and extends to the surface of the screw.

[0012] As a preferred embodiment, a positioning recess is provided in the assembly groove along the axial direction, and the reflux device body is embedded in the positioning recess.

[0013] As a preferred embodiment, the locking portion of the annular retainer is snap-connected to the outer peripheral wall of the wiper body.

[0014] As a preferred embodiment, the locking portion includes an elastic buckle formed by protruding outward from the inner circumferential wall of the annular retainer, and a locking groove is formed on the outer circumferential wall of the wiper body. In the assembled state, the elastic buckle is engaged in the locking groove on the circumferential wall of the wiper body.

[0015] As a preferred embodiment, an elastic tongue is formed on the inner circumferential wall of the retainer, and a deformation space is defined in the radial direction between the elastic tongue and the inner circumferential wall of the retainer so that the elastic tongue can be elastically deformed in the radial direction. The elastic clip is formed on the elastic tongue and the elastic clip is combined with or separated from the locking groove by the elastic deformation of the elastic tongue in the radial direction.

[0016] As a preferred embodiment, the two semi-annular parts are combined into one body by means of a snap connection, and the annular retainer has an annular retaining groove that is adapted to the shape of the wiper body combined into one body.

[0017] Compared with the prior art, the at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects:

[0018] First, in this scheme, the two semi-annular parts of the scraper body can be assembled into the assembly groove on the nut and combined into a whole, so that the inner end surface of the whole rests against the surface of the positioning piece of the return assembly, and then the annular retainer is wrapped around the outer periphery of the scraper body and rests axially against the surface of the positioning piece of the return assembly. After the retainer is assembled in place, the circumferential rotation of the annular retainer in the assembly groove is limited by the cooperation of the stopper on the positioning piece and the outer peripheral wall of the annular retainer. At the same time, the retainer and the scraper are locked by the cooperation of the inner peripheral wall on the scraper body and the locking part on the annular retainer. The relative position of the wiper body is determined by the screw thread of the wiper body, so that the wiper body is restricted from circumferential rotation in the assembly groove, and thus cannot produce axial movement relative to the nut. Since the relative positions of the retainer and the wiper body are locked, the retainer cannot produce axial movement. That is, the present invention can achieve reliable positioning of the entire wiper assembly by the mutual constraint relationship between the wiper body and the retainer, without using a large number of radial screw connections or axial screw connections and opening radial threaded holes on the nut or other components, so that the assembly structure of the wiper assembly is simple and reliable, and the assembly process becomes simple and efficient.

[0019] Secondly, since in this scheme, a rotation stop is provided on the positioning plate for locking the position of the return flow body, the circumferential rotation of the assembled wiper assembly in the assembly groove is limited, thereby limiting the axial movement of the wiper assembly. Compared with the existing scheme, the limiting structure on the positioning plate is cleverly utilized without the need for limiting structures such as limiting grooves or limiting protrusions on the inner wall of the nut, thereby realizing the positioning assembly of the wiper assembly, saving the steps of nut processing and manufacturing, and reserving more safety space for the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is a schematic diagram of the split structure of Example 1 in this application;

[0022] Figure 2 This is a schematic diagram of the component disassembly structure of Example 1 in this application;

[0023] Figure 3 This is a schematic diagram of the component structure of Example 1 in this application;

[0024] Figure 4 It is a cross-sectional schematic diagram of Example 1 in this application;

[0025] Figure 5 It is a structural diagram of Example 2 in this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Screw 1; thread groove 11; nut 2; assembly groove 21; positioning recess 211; return flow assembly 3; return flow body 31; positioning piece 32; locking piece 33; anti-rotation portion 331; wiper assembly 4; wiper body 41; first part 411; second part 412; locking groove 413; connecting structure 414; wiper lip 42; raised ring portion 43; retainer 44; locking portion 45; elastic tongue 451; annular retaining groove 46; joint 47; alignment groove 48. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0029] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0030] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0031] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0032] The embodiment of this specification proposes a ball screw 1, which aims to solve the problems in the prior art of complex assembly structure of the wiper assembly 4, the need to open a limiting structure on the main body of the nut 2, and the cumbersome assembly process. It not only simplifies the assembly structure of the wiper assembly 4, making it unnecessary to open limiting structures such as holes, grooves or protrusions on the main body of the nut 2, but also can achieve reliable axial positioning of the wiper assembly 4, and the assembly process is simple and efficient.

[0033] The following describes in detail how this solution solves the above technical problems and achieves the expected technical effects with reference to the accompanying drawings. Example

[0034] like Figure 1As shown, the ball screw of this embodiment includes a screw 1, a nut 2 sleeved on the screw 1 and having an axially through-going reflow hole, and a plurality of balls arranged in a ball load channel surrounded by the thread grooves of the screw 1 and the nut 2. Both ends of the nut 2 are provided with an annular assembly groove 21 arranged coaxially with the screw. The assembly groove 21 penetrates the inner wall of the nut 2 along the radial inner side. A reflux assembly 3 and a scraper assembly 4 are arranged in the assembly groove 21, wherein the reflux assembly 3 includes a reflux body 31 embedded in the assembly groove 21 along the axial direction and a scraper assembly 4 for locking the reflux. The main body 31 is positioned and provided with a positioning piece 32 with a stop portion 331 on its surface. Specifically, a positioning recess 211 is provided on the bottom surface of the assembly groove 21 along the axial direction. In the assembled state, the return flow device body 31 is embedded in the positioning recess 211. A ball guide channel is provided in the return flow device body 31 for guiding a plurality of balls to circulate between the return hole and the ball load channel on the nut 2. In the assembled state, one end of the return flow device body 31 along the axial direction abuts against the positioning recess 211, and the other end is limited by the positioning piece 32 fixed on the assembly groove 21.

[0035] The wiper assembly 4 comprises a wiper body 41 which is composed of two detachable semi-annular parts suitable for being sleeved on the outside of the screw 1 and having a wiper lip 42 formed on the inner peripheral wall extending into the thread groove 11 of the screw 1, and an annular retainer 44 which is used to maintain the shape of the wiper body 41 and has a locking portion 45 provided on the inner peripheral wall. Figure 3 As shown, the wiper body 41 is composed of a semi-annular first part 411 and a second part 412 combined by a connecting structure 414. The connecting structure 414 includes a snap portion arranged at both ends of the first part 411 and a snap groove arranged at both ends of the second part 412. The two ends of the first part 411 and the second part 412 are placed opposite to each other, and the first part 411 and the second part 412 are combined into a whole through the cooperation of the snap portion and the snap groove. The advantage of this arrangement is that the split wiper body 41 can be directly installed near the target assembly position in the assembly groove 21, without the need to guide the wiper body 41 to the target assembly position through the guidance of a long-stroke thread, thereby making the assembly of the wiper more convenient. The annular retainer 44 has an annular retaining groove 46 that is adapted to the shape of the wiper body 41 that is combined into one. In the assembled state, the wiper body 41 can be wrapped in the annular retaining groove 46, so that the three parts are combined into an integral structure, which can not only increase the overall rigidity of the wiper assembly 4, but also maintain the shape of the wiper body 41 when the screw 1 is running, preventing the reaction force generated by the screw 1 on the wiper body 41 from causing extrusion deformation of the wiper body.

[0036] Here, as an advantage, the wiper body 41 can be made of rubber, and the annular retainer 44 can be made of plastic material such as polyamide or metal material such as zinc alloy. The annular retainer 44 has a higher hardness than the wiper body 41 .

[0037] like Figure 1 、 Figure 3 and Figure 4 As shown, the annular retainer 44 is configured such that its outer wall can be detachably engaged with the anti-rotation portion 331 to limit the circumferential rotation of the retainer 44 in the assembled state, and the locking portion 45 can be detachably engaged with the outer wall of the wiper body 41 to lock the relative position of the retainer 44 and the wiper body 41 in the assembled state. Here, the outer peripheral wall of the annular retainer 44 can be detachably engaged with the anti-rotation portion 331, and the locking portion 45 can be detachably engaged with the outer peripheral wall of the wiper body 41 as an example for description. In fact, as long as the axial limitation of the retainer 44 and the locking of the relative positions of the wiper body 41 and the retainer 4 can be achieved within the assembly groove 21, the specific arrangement of the engagement position is not limited in this embodiment.

[0038] In this embodiment, the return flow assembly 3 is assembled first. Specifically, the return flow body 31 is first axially embedded in the positioning recess 211 so that its ball guide channel is connected to the return hole on the corresponding nut 2 and the ball load channel between the nut 2 and the screw 1. Then, the positioning piece 32 is fixed to the bottom of the assembly groove 21 to confine the return flow body 31 in the positioning recess 211 to achieve axial positioning of the return flow body 31. Then assemble the wiper assembly 4. Specifically, first move the first part 411 and the second part 412 of the wiper body 41 to the vicinity of the target assembly position in the assembly groove 31, then put the first part 411 and the second part 412 on the outside of the screw and combine them into a whole, and then make the inner end face of the whole abut against the surface of the positioning piece 32 of the reflow assembly 3, and then wrap the annular retainer 44 around the outer periphery of the wiper body 41 and abut against the surface of the positioning piece 32 of the reflow assembly 3 in the axial direction. After the retainer 44 is assembled in place, the circumferential rotation of the annular retainer 44 in the assembly groove 21 is limited by the cooperation of the stop portion 331 on the positioning piece 32 and the outer peripheral wall of the annular retainer 44. At the same time, the inner peripheral surface of the wiper body 41 is used to prevent the annular retainer 44 from rotating in the assembly groove 21. The cooperation between the wall and the locking portion 45 on the annular retainer 44 locks the relative position of the retainer 44 and the wiper body 41, so that the wiper body 41 is restricted from circumferential rotation in the assembly groove 21, and thus cannot produce axial movement relative to the nut 2. Since the relative position of the retainer 44 and the wiper body 41 is locked, the retainer 44 cannot produce axial movement, that is, the reliable positioning of the entire wiper assembly 4 can be achieved by the mutual constraint relationship between the wiper body 41 and the retainer 44. In this process, there is no need to use a large number of radial screw connectors or axial screw connectors and to open radial threaded holes on the nut 2 or other components, so that the assembly structure of the wiper assembly 4 is simple and reliable, and the assembly process becomes simple and efficient.

[0039] Furthermore, in this embodiment, by providing a stop portion 331 on the positioning piece 32 for locking the position of the return flow body 31, the circumferential rotation of the assembled wiper assembly 4 in the assembly groove 21 is limited, thereby limiting the axial movement of the wiper assembly 4. Compared with the prior art, the limiting structure on the positioning piece 32 is cleverly utilized to achieve the positioning assembly of the wiper assembly 4, without the need to provide limiting structures such as limiting grooves or limiting protrusions on the inner wall of the nut 2, thereby saving the steps of processing and manufacturing the nut 2, reserving more safety space for the nut 2, and improving the reliability and life of the nut 2.

[0040] In this embodiment, the anti-rotation portion 331 is formed by a portion protruding axially outward from the surface of the positioning piece 32. In one embodiment, the positioning piece 32 is provided with at least one locking member 33 for locking the positioning piece 32 to the bottom of the assembly slot 21. The anti-rotation portion 331 is formed on the at least one locking member 33. For example, the locking member 33 is a threaded fastener with a head, and the anti-rotation portion 331 is formed on the head of the threaded fastener. Preferably, the positioning piece 32 is provided with two opposing first connecting holes, and the bottom surface of the assembly slot 21 is provided with a second connecting hole that mates with the first connecting holes. The threaded fastener passes through the corresponding first and second connecting holes to lock the positioning piece 32 to the bottom surface of the assembly slot 21. Preferably, the positioning piece 32 is annular. After assembly, the head of the threaded fastener protrudes from the surface of the positioning piece 32 toward the opening of the assembly slot. The outer peripheral wall of the retainer 44 is provided with a coupling portion 47 that mates with the anti-rotation portion 331 on the head. In this embodiment, the coupling portion 47 is a groove. In this embodiment, the portion of the locking member 33 that protrudes from the surface of the positioning piece 32 is used as a limiting structure for circumferentially limiting the annular retainer 44. On the basis of being able to achieve reliable axial positioning of the wiper assembly 4, the step of processing the limiting structure on the positioning piece 32 is further saved, thereby further simplifying the assembly structure of the wiper assembly 4 and improving the assembly efficiency of the ball screw.

[0041] Here, the inner circumferential wall of the retainer 44 is provided with two opposing alignment grooves 48, and the first portion 411 and the second portion 412 are both provided with alignment blocks. Before the retainer 44 is wrapped around the outer circumference of the wiper body 41, the alignment blocks on the first portion 411 and the second portion 412 are first engaged with the alignment grooves 48 at corresponding positions on the retainer 44 to ensure that the locking grooves 413 on the outer circumferential wall of the wiper body 41 can correspond with the locking portions 45 on the retainer 44. More specifically, the locking grooves 413 are both provided on the first portion 411 and the second portion 412, and the retainer 44 is provided with locking portions 45 that cooperate with the two locking grooves 413. That is, after the alignment blocks on the first portion 411 and the second portion 412 are engaged with the alignment grooves 48 at corresponding positions on the retainer 44, the two locking grooves 413 can each engage with the corresponding locking portion 45, thereby achieving rapid assembly of the wiper assembly 4.

[0042] refer to Figure 3As shown, in order to prevent the scraper lip 42 on the scraper body from exerting a large preload on the screw surface during operation, in this embodiment, the scraper body 41 includes a raised ring portion 43 formed on the inner circumferential wall of the scraper body 41 and having a harderness less than that of the scraper lip 42. A small gap is reserved between the scraper lip 42 and the groove wall of the thread groove 11 of the screw 1. This can reduce the preload exerted by the scraper lip 42, which is harder, on the surface of the screw 1, thereby reducing the friction generated by the contact between the scraper lip 42 and the surface of the screw 1, that is, reducing the friction and wear on the surface of the screw 1. However, this small gap can also allow some fine dust to enter the interior of the nut 2, thereby shortening the life of the nut and screw. To this end, a raised ring portion 43 with a smaller hardness is provided. The raised ring portion 43 is constructed so that the inner circumferential wall always passes through the reserved gap in the radial direction and extends to the surface of the screw 1. This can achieve a sealing effect on the reserved gap, preventing fine dust from entering the nut 2 through this tiny gap. At the same time, since the bead portion 43 is softer than the scraping lip 42, the pre-pressure on the surface of the screw 1 is also smaller, thereby reducing friction and wear on the surface of the screw 1.

[0043] refer to Figure 4 As shown, the locking portion 45 of the annular retainer 44 is snap-connected to the outer circumferential wall of the wiper body 41. Specifically, the locking portion 45 comprises an elastic snap formed by protruding outward from the inner circumferential wall of the annular retainer 44. A locking groove 413 is formed on the outer circumferential wall of the wiper body 41. When assembled, the elastic snap engages within the locking groove 413 on the outer circumferential wall of the wiper body 41. More specifically, an elastic tongue 451 is formed on the inner circumferential wall of the retainer 44. A radial deformation space is defined between the elastic tongue 451 and the inner circumferential wall of the retainer 44 to enable the elastic tongue 451 to elastically deform in the radial direction. The elastic snap is formed on the elastic tongue 451 and is engaged or disengaged with the locking groove 413 by elastic deformation of the elastic tongue 451 in the radial direction. Preferably, an avoidance groove is provided on the inner peripheral wall of the annular retainer 44, and an elastic tongue 451 is formed to protrude outward from the side wall of the avoidance groove. The elastic tongue 451 and the bottom wall of the avoidance groove define the deformation space so that the elastic tongue 451 can be elastically deformed in the radial direction. Example

[0044] like Figure 5As shown, the difference between this embodiment and the first embodiment is that the stopper 331 does not protrude from the surface of the positioning piece 32, but rather the stopper 331 is a snap-in hole formed on the surface of the positioning piece 32, and the coupling portion 47 is a snap-in block formed on the end face of the retainer 44. Through the cooperation of the snap-in block and the snap-in hole, the technical purpose of circumferentially limiting the retainer 44 is achieved. Although this method can also achieve circumferential limiting of the retainer 44 without machining a limiting structure on the inner wall of the nut 2, since it is still necessary to additionally open a hole or groove on the positioning piece 32, the first embodiment is still the preferred method. It should be noted that, through the above description, for example, setting the stopper 331 as a snap-in block and setting the coupling portion 47 as a snap-in hole, these basically equivalent variations should undoubtedly be included in the scope of the present application and will not be expanded here.

[0045] The parts not described above are the same as those in the first embodiment and will not be described in detail here.

[0046] In the above embodiment, the annular retainer 44 is restricted from circumferential rotation in the assembly groove by means of the cooperation between the stop portion 331 on the positioning piece 32 and the outer wall of the annular retainer 44. At the same time, the relative position of the retainer 44 and the wiper body 41 is locked by the cooperation between the inner wall of the wiper body 41 and the locking portion 45 on the annular retainer 44. In this way, the wiper body 41 is restricted from circumferential rotation in the assembly groove 21, thereby unable to produce axial movement relative to the nut 2. Since the relative positions of the retainer 44 and the wiper body 41 are locked, the retainer 44 is also unable to produce axial movement. That is, the present scheme can achieve reliable positioning of the entire wiper assembly 4 through the mutual constraint relationship between the wiper body 41 and the retainer 44, without using a large number of radial screw connections or axial screw connections and opening radial threaded holes on the nut 2 or other components, making the assembly structure of the wiper assembly simple and reliable, and the assembly process becomes simple and efficient.

[0047] In this specification, the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiments described later, the description is relatively simple, and the relevant parts can be referred to the partial description of the previous embodiments.

[0048] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A ball screw, comprising a screw, a nut sleeved on the screw and having an assembly groove at at least one end, characterized in that: The assembly tank is provided with: The return flow assembly comprises a return flow body axially embedded in the assembly groove and a positioning piece for locking the position of the return flow body and having a rotation-stopping portion on the surface; The scraper assembly includes a scraper body composed of two detachable semi-annular parts suitable for being sleeved on the outside of the screw, with a scraper lip formed on the inner peripheral wall extending into the screw thread groove, and an annular retainer for maintaining the shape of the scraper body and having a locking portion on the surface; The annular retainer is configured such that the outer wall thereof is detachably coupled to the anti-rotation portion so as to limit the circumferential rotation of the retainer in an assembled state, and the locking portion is detachably coupled to the outer wall of the wiper body so as to lock the relative positions of the retainer and the wiper body in an assembled state.

2. The ball screw according to claim 1, characterized in that The anti-rotation portion is formed by a portion protruding outwardly from the surface of the positioning piece in the axial direction.

3. The ball screw according to claim 1 or 2, characterized in that: The positioning piece is provided with at least one locking piece for locking the positioning piece at the bottom of the assembly groove, and the anti-rotation portion is formed on the at least one locking piece.

4. The ball screw according to claim 3, characterized in that The locking piece is a threaded fastener with a head, the anti-rotation portion is formed on the head of the locking piece, and the locking portion is formed on the outer peripheral wall of the annular retainer.

5. The ball screw according to claim 1, characterized in that The scraper body includes a raised ring portion formed on the inner peripheral wall of the scraper body and having a hardness less than that of the scraper lip. A gap is reserved between the scraper lip and the groove wall of the screw thread groove. The raised ring portion is constructed so that the inner peripheral wall always passes through the reserved gap in the radial direction and extends to the surface of the screw.

6. The ball screw according to claim 1, characterized in that A positioning recess is provided in the assembly groove along the axial direction, and the reflux device body is embedded in the positioning recess.

7. The ball screw according to claim 1, characterized in that The locking portion of the annular retainer is snap-connected to the outer peripheral wall of the wiper body.

8. The ball screw according to claim 1, characterized in that The locking portion includes an elastic buckle formed by protruding outward from the inner peripheral wall of the annular retainer, and a locking groove is formed on the outer peripheral wall of the wiper body. In the assembled state, the elastic buckle is engaged in the locking groove on the outer peripheral wall of the wiper body.

9. The ball screw according to claim 8, characterized in that An elastic tongue is formed on the inner circumferential wall of the retainer, and a deformation space is defined in the radial direction between the elastic tongue and the inner circumferential wall of the retainer so that the elastic tongue can be elastically deformed in the radial direction. The elastic clip is formed on the elastic tongue and the elastic clip is engaged with or separated from the locking groove by the elastic deformation of the elastic tongue in the radial direction.

10. The ball screw according to claim 1, characterized in that The two semi-annular parts are combined into one body by means of a snap connection, and the annular retainer is provided with an annular retaining groove which is adapted to the shape of the wiper body combined into one body.

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