Internal circulation type ball screw

Abstract

The utility model provides an internal circulation type ball screw. The internal circulation type ball screw comprises a screw shaft, a nut, a positioning piece and a backflow element. The nut is movably arranged on the screw shaft in a sleeved mode, a load path is formed between the nut and the screw shaft, the nut is provided with an installation groove and two positioning grooves oppositely connected with the installation groove, and the positioning piece is detachably arranged in the positioning grooves of the nut. The backflow element is positioned in the mounting groove of the nut by the positioning piece, a non-load path connected with the load path is formed between the backflow element and the nut, the outer surface of the backflow element is provided with a limiting part, and the limiting part of the backflow element is arranged between two opposite end parts of the positioning piece and is used for preventing the positioning piece from rotating and preventing the positioning piece from being separated from the positioning groove. Therefore, the internal circulation type ball screw provided by the utility model can be conveniently assembled, and meanwhile, the problem that the positioning piece is separated from the positioning groove can be solved.

Description

Technical Field

[0001] The utility model relates to an internal circulation ball screw, in particular to an internal circulation ball screw which is easy to assemble. Background Art

[0002] The ball screw disclosed in invention patent JP7487635B2 features a C-clip on the top surface of the return element, which secures the return element within the nut's assembly hole to prevent it from falling out. However, in the aforementioned patent, the C-clip could rotate relative to the return element during nut operation. Once the C-clip rotates, it could potentially disengage from the grooves on either side, losing its ability to secure the return element, increasing the risk of the return element falling out of the nut's assembly hole. Utility Model Content

[0003] The main purpose of the utility model is to provide an internal circulation ball screw, which is easy to assemble and can prevent components from falling off.

[0004] In order to achieve the above-mentioned main purpose, the internal circulation ball screw provided by the present invention includes a screw shaft, a nut, a positioning member, a reflux element, and a plurality of balls. The screw shaft has an external thread groove; the nut has an axial hole and is displaceably mounted on the screw shaft with the axial hole. The nut also has an internal thread groove, a mounting groove and two opposite positioning grooves. The internal thread groove is arranged on the hole wall of the axial hole and forms a load path with the external thread groove of the screw shaft. The mounting groove is arranged on the outer surface of the nut and is radially connected to the axial hole. The positioning groove is arranged on the groove wall of the mounting groove and is connected to the mounting groove. The positioning member is located in the mounting groove of the nut and can The reflux element is detachably arranged in the positioning groove of the nut; the reflux element is positioned in the installation groove of the nut by the positioning piece, the outer surface of the reflux element has a limiting portion, the limiting portion of the reflux element is located between the two opposite ends of the positioning piece, the inner surface of the reflux element has a reflux groove, the reflux groove of the reflux element and the external thread groove of the screw shaft form a non-load path, the non-load path is connected to the load path to form a circulation path for the ball to run.

[0005] As can be seen from the above, when assembling the return element, the return element is first placed into the mounting groove of the nut from top to bottom, and then the positioning member is set in the positioning groove of the nut, thus completing the assembly of the return element. After the return element is assembled, the positioning member is restricted by the stopper of the return element to prevent rotation within the mounting groove, thereby effectively preventing the positioning member from falling off, thereby achieving the purpose of the utility model.

[0006] Preferably, the positioning member has an arcuate portion, and the outer surface of the reflux element further has a disassembly groove, wherein the arcuate portion of the positioning member and the disassembly groove of the reflux element overlap with each other. A disassembly tool inserted into the disassembly groove can be used to apply force to force the positioning member out of the positioning groove, thereby facilitating disassembly.

[0007] Preferably, the nut has two opposing inner flanges, which protrude from the groove wall of the mounting groove and are closer to the axial hole than the positioning groove. The two ends of the return element each have an outer flange, and the outer flange of the return element bears against the inner flange of the nut to keep the return element in the mounting groove.

[0008] Preferably, the positioning member is a C-clip and has a positioning portion. Each positioning slot has a straight section and an oblique section, the straight section extending parallel to the axial direction of the screw shaft, and the oblique section connected to one end of the straight section. Thus, the positioning portion of the positioning member can enter or exit each positioning slot along the oblique section of each positioning slot, thereby increasing the convenience of assembly and disassembly. When the positioning portion of the positioning member enters each positioning slot, it abuts against each straight section.

[0009] Preferably, the positioning member is a C-clip. When the positioning member is embedded in the positioning slot, its maximum outer diameter is defined as D1. When the positioning member is released from the positioning slot and squeezed by the slot wall of the mounting slot, its maximum outer diameter is defined as D2. The width of the mounting slot is defined as W, and the following relationship is satisfied between the three: D2 ≤ W < D1. This relationship makes the positioning member 40 easy to assemble and disassemble.

[0010] Preferably, a gap is formed between the ends of the positioning member, and the limiting portion of the reflux element is located in the gap of the positioning member.

[0011] The detailed structure, features, assembly, and usage of the internal circulation ball screw provided by the present invention will be described in the detailed description of the embodiments that follow. However, those skilled in the art should understand that these detailed descriptions and the specific embodiments listed for implementing the present invention are only for the purpose of illustrating the present invention and are not intended to limit the scope of the patent application for the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0013] Figure 1 A three-dimensional diagram of the internal circulation ball screw provided by the present invention;

[0014] Figure 2This is a three-dimensional exploded view of the internal circulation ball screw provided by the utility model;

[0015] Figure 3 A cross-sectional view of the internal circulation ball screw provided by the present invention;

[0016] Figure 4 A top view of the internal circulation ball screw provided by the present invention omitting the screw shaft, mainly showing the positioning member being embedded in the positioning groove of the nut;

[0017] Figure 5 for Figure 4 A partial enlarged view of

[0018] Figure 6 A top view of the internal circulation ball screw provided by the present invention omitting the screw shaft, mainly showing the positioning member disengaging from the positioning groove of the nut;

[0019] Figure 7 The top view of the internal circulation ball screw provided by the present invention omits the screw shaft and mainly shows the different shapes of the limiting parts;

[0020] Figure 8 The top view of the internal circulation ball screw provided by the present invention omits the screw shaft and mainly shows the different shapes of the limiting parts;

[0021] Figure 9 The top view of the internal circulation ball screw provided by the present invention omits the screw shaft and mainly shows the disassembly slots at different positions.

[0022] In the above drawings, the meanings of the reference numerals are as follows:

[0023] 10. Internal circulation ball screw;

[0024] 20. Screw shaft;

[0025] 22. External thread groove;

[0026] A. Axial;

[0027] 30. Nut;

[0028] 31. Axis hole;

[0029] 32. Internal thread groove;

[0030] 34. Mounting slot;

[0031] 342, groove wall;

[0032] 36. Positioning slot;

[0033] 362, straight extension section;

[0034] 364, oblique extension section;

[0035] 38. Inner flange;

[0036] 40. Positioning parts;

[0037] 42. Positioning unit;

[0038] 44. End;

[0039] 46. ​​arc-shaped portion;

[0040] 48. Gap;

[0041] 50. Reflux components;

[0042] 52. External flange;

[0043] 54. Reflux trough;

[0044] 56. Limiting part;

[0045] 58. Disassembly slot;

[0046] 60. Ball bearing;

[0047] 62. Load path;

[0048] 64. Non-load path;

[0049] 66. Circular path. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0051] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the presence of the features, steps, operations and / or components, but do not exclude the presence or addition of one or more other features, steps, operations or components.

[0052] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0053] When expressions such as “at least one of A, B, and C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, and C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc. When expressions such as “at least one of A, B, or C, etc.” are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, “a system having at least one of A, B, or C” should include but is not limited to systems having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, and C, etc.

[0054] It should also be noted that directional terms such as "upper," "lower," "front," "back," "left," and "right" mentioned in the embodiments are merely references to the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, identical elements are represented by identical or similar reference numerals. Conventional structures or configurations will be omitted where they may cause confusion in understanding the present invention.

[0055] The applicant first clarifies that throughout this specification, including the embodiments described below and the claims, directional terms are based on the directions in the drawings. Furthermore, in the embodiments and drawings described below, identical component numbers represent identical or similar components or structural features.

[0056] See also Figure 1 and Figure 2 The internal circulation ball screw 10 of the present invention includes a screw shaft 20 , a nut 30 , a positioning member 40 , a return element 50 , and a plurality of balls 60 .

[0057] The outer peripheral surface of the screw shaft 20 has an external thread groove 22 extending along the axial direction thereof.

[0058] The nut 30 has an axial hole 31 that passes through two opposite end surfaces. The nut 30 is sleeved on the screw shaft 20 through the axial hole 31 and can move along the axial direction A of the screw shaft 20. The nut 30 also has an internal thread groove 32, a mounting groove 34, two positioning grooves 36 and two internal flanges 38. The internal thread groove 32 is provided on the hole wall of the axial hole 31 and forms a load path 62 (such as Figure 3 As shown); the mounting groove 34 is provided on the outer surface of the nut 30 and is radially connected to the shaft hole 31; two positioning grooves 36 are provided on the groove wall 342 of the mounting groove 34 in a manner opposite to each other and are connected to the mounting groove 34, as shown Figure 3As shown, each positioning groove 36 has a straight section 362 and two oblique sections 364. The extension direction of the straight section 362 is parallel to the axial direction A of the screw shaft 20. The two oblique sections 364 are connected to the two ends of the straight section 362. Two inner flanges 38 protrude from the groove walls at both ends of the mounting groove 34 and are closer to the shaft hole 31 (as shown in FIG. Figure 5 shown).

[0059] The positioning member 40 is a C-shaped buckle in this embodiment. The positioning member 40 has two opposite positioning portions 42, two opposite ends 44, and an arc-shaped portion 46. One end of the two positioning portions 42 is integrally connected to the two ends 44, forming a gap 48 between the two ends 44. The other ends of the two positioning portions 42 are integrally connected to the arc-shaped portion 46. Figure 4 and Figure 5 As shown, the two positioning portions 42 of the positioning member 40 enter or leave the two positioning slots 36 through one of the oblique extension sections 364 to increase the convenience of assembly and disassembly. When the two positioning portions 42 of the positioning member 40 enter the two positioning slots 36, they respectively abut against the two straight extension sections 362.

[0060] The return element 50 has an outer flange 52 at each end. The return element 50 is disposed in the mounting groove 34 of the nut 30 and the two outer flanges 52 bear against the two inner flanges 38 of the nut 30, so that the return element 50 is supported and can be retained in the mounting groove 34 under the restriction of the positioning member 40. Figure 3 As shown, the inner surface of the return element 50 has four return grooves 54. The return grooves 54 of the return element 50 and the external thread grooves 22 of the screw shaft 20 form a non-load path 64. The non-load path 64 connects to the load path 62 to form a circulation path 66 for the ball 60 to run.

[0061] like Figure 4 and Figure 5 As shown, the outer surface of the reflux element 50 has a limiting portion 56. The limiting portion 56 of the reflux element 50 is located in the notch 48 of the positioning member 40 to prevent the positioning member 40 from rotating. It should be noted that the limiting portion 56 can be designed into different shapes according to actual needs. In this embodiment, it is mainly a triangle. However, in practice, the limiting portion 56 can also be designed as follows: Figure 7 The rectangle shown or Figure 8 The circular shape shown in FIG. 1 , regardless of which shape, can achieve the effect of preventing the positioning member 40 from rotating as long as it can extend into the notch 48 of the positioning member 40. In addition, as Figure 4 As shown, the outer surface of the reflux element 50 further has a disassembly groove 58. The disassembly groove 58 of the reflux element 50 and the arc-shaped portion 46 of the positioning member 40 overlap with each other. It should be supplemented here that the disassembly groove 58 is provided in the center of the outer surface in this embodiment (as shown in FIG. Figure 4However, in order to cope with the impact of the ball 60, the disassembly groove 58 can also be set at a position close to the outer edge (as shown). Figure 9 As shown), the return element 50 maintains sufficient structural strength.

[0062] As can be seen from the above, during assembly, the return element 50 is first placed from top to bottom into the mounting groove 34 of the nut 30. Next, the two positioning portions 42 of the positioning member 40 are inserted into the two positioning grooves 36 of the nut 30 along the two oblique extensions 364 of the two positioning grooves 36, thus completing the assembly of the return element 50. After the return element 50 is assembled, the positioning member 40 is restricted from rotating within the mounting groove 34 by the stopper 56 of the return element 50. This effectively prevents the positioning member 40 from falling off, thereby ensuring that the return element 50 is stably retained within the mounting groove 34 of the nut 30.

[0063] When disassembling, a disassembly tool (not shown) is inserted into the disassembly groove 58 and then applied to push the arc portion 46 of the positioning member 40, thereby forcing the two positioning portions 42 of the positioning member 40 to disengage from the two positioning grooves 36 along the two oblique extensions 364. At this time, the positioning member 40 can be disassembled. It should be noted that when the two positioning portions 42 of the positioning member 40 are embedded in the two positioning grooves 36, the maximum outer diameter of the positioning member 40 is defined as D1 (e.g., Figure 4 As shown in FIG. 3 ), when the two positioning portions 42 of the positioning member 40 are separated from the two positioning grooves 36 and squeezed by the groove wall 342 of the mounting groove 34, the maximum outer diameter of the positioning member 40 is defined as D2 (as shown in FIG. Figure 6 As shown in FIG. 3 ), the width of the mounting groove 34 is defined as W, and the three satisfy the following relationship: D2≤W<D1. Through the above relationship, the positioning member 40 can achieve the effect of convenient assembly and disassembly.

[0064] The above describes embodiments of the present invention. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be used in combination to advantage. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. An internal circulation ball screw, characterized in that: Include: a screw shaft having an external thread groove; a nut having an axial hole and being displaceably sleeved on the screw shaft with the axial hole, the nut further comprising an internal thread groove, a mounting groove, and two opposing positioning grooves, the internal thread groove being provided in the hole wall of the axial hole and forming a load path with the external thread groove of the screw shaft, the mounting groove being provided on the outer surface of the nut and radially communicating with the axial hole, and the positioning groove being provided in the groove wall of the mounting groove and communicating with the mounting groove; a positioning member, located in the mounting groove of the nut and detachably mounted on the positioning groove of the nut, the positioning member having two opposite ends; a reflux element positioned within the mounting groove of the nut by the positioning member, the reflux element having a stopper on its outer surface, the stopper being located between two opposite ends of the positioning member, and a reflux groove on its inner surface, the reflux groove forming a non-load path with the external thread groove of the screw shaft, the non-load path connecting to the load path to form a circulation path; and A plurality of balls are arranged in the circulation path.

2. The internal circulation ball screw according to claim 1, characterized in that: The positioning piece has an arc-shaped portion, and the outer surface of the reflux element further has a disassembly groove, and the arc-shaped portion of the positioning piece and the disassembly groove of the reflux element overlap with each other.

3. The internal circulation ball screw according to claim 1, characterized in that: The nut has two opposite inner flanges, which protrude from the groove wall of the mounting groove and are closer to the axial hole than the positioning groove. The two ends of the return element respectively have an outer flange, and the outer flange of the return element bears against the inner flange of the nut.

4. The internal circulation ball screw according to claim 1, characterized in that: The positioning member is a C-clip; each positioning groove has a straight section and an oblique section, the extension direction of the straight section is parallel to the axial direction of the screw shaft, and the oblique section is connected to one end of the straight section; the positioning member has two opposite positioning parts, each of the positioning parts can enter or leave each positioning groove along each oblique section, and when each positioning part enters each positioning groove, it abuts against each straight section.

5. The internal circulation ball screw according to claim 1, characterized in that: The positioning piece is a C-clip. When the positioning piece is embedded in the positioning groove, the maximum outer diameter of the positioning piece is defined as D1. When the positioning piece is separated from the positioning groove and squeezed by the groove wall of the installation groove, the maximum outer diameter of the positioning piece is defined as D2. The width of the installation groove is defined as W. The three satisfy the following relationship: D2≤W<D1.

6. The internal circulation ball screw according to claim 1, characterized in that: A gap is formed between the ends of the positioning member, and the limiting portion of the reflux element is located in the gap of the positioning member.

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