Nut structure capable of eliminating lead screw gap

Abstract

The utility model relates to the technical field of mechanical transmission parts, in particular to a nut structure capable of eliminating a lead screw gap, which comprises a lead screw body, a mounting sleeve is sleeved on the outer wall of the lead screw body, and the nut structure can be used for adjusting the lead screw gap by arranging a first nut and a second nut on the lead screw body and arranging a spring between the two nuts. Therefore, thrust for pushing the two nuts to the two sides is formed by means of the mounting sleeve, an inner thread of the first nut is attached to an outer thread of the lead screw body leftwards, an inner thread of the second nut is attached to the outer thread of the lead screw body rightwards, a gap between the first nut and the lead screw body is reduced, the risk of structural shaking is reduced, and the service life of the lead screw is prolonged. The precision of an electric cylinder, an electric sliding table and the like using the structure is improved, the distance between the first nut and the second nut can be adjusted to change the compression length of the spring, and the effect of changing the thrust for pushing the two nuts towards the two sides is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical transmission parts technical field especially, relates to a nut structure of eliminating screw rod gap. BACKGROUND

[0002] Screw rod as a kind of mechanical transmission parts product, its function is to convert rotary motion into linear motion. The existing screw rod includes a screw rod shaft, a nut set on the screw rod shaft. In mechanical equipment, after the pre-tightening between screw rod and nut, in order to make the rotation of nut on screw rod more smooth, there is always a gap between screw rod and nut. It is related to the running efficiency and life of equipment. Reasonable gap can significantly reduce friction and wear, ensure stable operation of equipment. But the gap will make the structure shake. SUMMARY

[0003] The utility model discloses a nut structure of eliminating screw rod gap to solve the shortcoming that the gap in prior art makes the structure shake.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] Design a kind of nut structure of eliminating screw rod gap, including screw rod body, the outer wall of the screw rod body is equipped with installation sleeve, and the left end of installation sleeve is equipped with the installation structure for connecting driven component, the inside of installation sleeve is inserted with first nut and second nut respectively located in left and right sides, and the inner thread on the inner wall of first nut and second nut is all screw thread connection outer thread on the outer wall of screw rod body, the inner wall of installation sleeve is fixedly connected first nut by fastening structure, the outer wall of second nut is slidably connected installation sleeve by sliding limit structure, the inside of installation sleeve is inserted spring, and the left and right ends of spring are respectively abutted first nut and second nut.

[0006] Preferably, the spring includes wave washer spring and the spring does not contact with the screw rod body.

[0007] Preferably, the fastening structure includes fastening hole, fastening stud, the outer wall of installation sleeve is equipped with several groups of fastening holes, and the inside of a group of fastening holes is screw thread connected with fastening stud, and the end of fastening stud located in installation sleeve is abutted first nut.

[0008] Preferably, the end face of fastening stud located outside installation sleeve is equipped with hexagonal hole, which is convenient for hexagonal wrench insertion and drives fastening stud rotation.

[0009] Preferably, the sliding limiting structure comprises limiting sliding blocks and limiting sliding grooves, a plurality of limiting sliding grooves are formed in the outer wall of the right end of the mounting sleeve, and the limiting sliding grooves are located at the right side of the first nut, and a plurality of limiting sliding blocks are integrally formed on the outer wall of the second nut and are slidably arranged in the plurality of limiting sliding grooves.

[0010] Preferably, the plurality of groups of fastening holes are equidistantly arranged along the axis direction of the mounting sleeve, and the axes of the plurality of fastening holes in one group point to the same point on the axis of the mounting sleeve.

[0011] Preferably, the mounting structure comprises a flange ring and mounting holes, the left end of the mounting sleeve is integrally formed with a flange ring, a plurality of mounting holes for mounting fasteners such as screws are formed in the side surface of the flange ring, and the plurality of mounting holes are arranged in a circumferential array on the flange ring with the center of the flange ring as the center.

[0012] The nut structure capable of eliminating the gap of the screw rod has the beneficial effects that: the nut structure can set the first nut and the second nut on the screw rod body, set the spring between the two nuts, form the pushing force for pushing the two nuts to the two sides by means of the mounting sleeve, make the inner wire of the first nut left adhere to the outer wire of the screw rod body and the inner wire of the second nut right adhere to the outer wire of the screw rod body, thereby reducing the gap with the screw rod body, reducing the risk of structure shaking, improving the precision of the electric cylinder, the electric sliding table and the like using the structure, and adjusting the distance between the first nut and the second nut to change the compression length of the spring, achieving the effect of changing the pushing force for pushing the two nuts to the two sides. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a front view of the nut structure capable of eliminating the gap of the screw rod proposed in the utility model;

[0014] Figure 2 It is an external structure schematic view of the nut structure capable of eliminating the gap of the screw rod proposed in the utility model;

[0015] Figure 3 It is an internal structure schematic view of the nut structure capable of eliminating the gap of the screw rod proposed in the utility model;

[0016] Figure 4 It is a cut structure schematic view of the nut structure capable of eliminating the gap of the screw rod proposed in the utility model;

[0017] Figure 5 It is a side view of the nut structure capable of eliminating the gap of the screw rod proposed in the utility model.

[0018] In the diagram: 1. Mounting sleeve; 2. Flange ring; 3. Fastening hole; 4. Fastening stud; 5. Spring; 6. Second nut; 7. Lead screw body; 8. Limiting slider; 9. Limiting groove; 10. Mounting hole; 11. First nut. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figures 1-5 A nut structure for eliminating lead screw backlash includes a lead screw body 7, an mounting sleeve 1 sleeved on the outer wall of the lead screw body 7, and a mounting structure for connecting a driven component at the left end of the mounting sleeve 1. A first nut 11 and a second nut 6 located on the left and right sides are inserted into the mounting sleeve 1, and the internal threads on the inner walls of the first nut 11 and the second nut 6 are threaded to the external threads on the outer wall of the lead screw body 7. The inner wall of the mounting sleeve 1 is fixedly connected to the first nut 11 by a fastening structure, and the outer wall of the second nut 6 is slidably connected to the mounting sleeve 1 by a sliding limiting structure. A spring 5 is inserted into the mounting sleeve 1, and the left and right ends of the spring 5 abut against the first nut 11 and the second nut 6, respectively.

[0021] Reference Figures 1-5 In order to reduce the contact and friction between the spring 5 and the lead screw body 7, the spring 5 includes a wave-shaped washer spring and the spring 5 does not contact the lead screw body 7.

[0022] Reference Figures 1-5 In order to fix the first nut 11 of the inserted mounting sleeve 1, the fastening structure includes fastening holes 3 and fastening studs 4. Several sets of fastening holes 3 are provided on the outer wall of the mounting sleeve 1, and a set of fastening holes 3 is internally threaded with fastening studs 4. One end of the fastening stud 4 located inside the mounting sleeve 1 abuts against the first nut 11.

[0023] Reference Figures 1-5 In order to facilitate the installation and removal of the fastening stud 4 and ensure that the surface of the mounting sleeve 1 is flat and without protrusions, the end face of the fastening stud 4 located outside the mounting sleeve 1 is provided with a hexagonal hole to facilitate the insertion of a hexagonal wrench and to drive the fastening stud 4 to rotate.

[0024] Reference Figures 1-5 In order to synchronize the number of rotations of the second nut 6 and the first nut 11, the sliding limit structure includes a limit slider 8 and a limit groove 9. Several limit grooves 9 are provided on the outer wall of the right end of the mounting sleeve 1, and the limit grooves 9 are located on the right side of the first nut 11. Several limit sliders 8 are integrally formed on the outer wall of the second nut 6, and the limit sliders 8 are slidably disposed in several limit grooves 9 respectively.

[0025] Reference Figures 1-5 In order to enable the first nut 11, which is installed in different positions inside the mounting sleeve 1, to be fixed by screwing the fastening stud 4 into different sets of fastening holes 3, several sets of fastening holes 3 are equidistantly arranged along the axial direction of the mounting sleeve 1, and the axes of several fastening holes 3 in one set point to the same point on the axis of the mounting sleeve 1.

[0026] Reference Figures 1-5 In order to fix the mounting sleeve 1 to the component that needs to be driven to move left and right, the mounting structure includes a flange ring 2 and mounting holes 10. The flange ring 2 is integrally formed on the outer wall of the left end of the mounting sleeve 1. Several mounting holes 10 for fasteners such as screws are opened on the side of the flange ring 2, and the several mounting holes 10 are arranged in a circular array on the flange ring 2 with the center of the flange ring 2 as the center.

[0027] Working principle: First, spring 5 is fitted onto the lead screw body 7. Then, first nuts 11 and second nuts 6, located on the left and right sides of spring 5 respectively, are rotated onto the lead screw body 7 from both ends, so that spring 5 is clamped between first nuts 11 and second nuts 6. Next, mounting sleeve 1 is fitted onto the lead screw body 7 from the left side of second nut 6, and the mounting sleeve 1 is fitted over second nut 6, spring 5 and first nut 11, so that the limiting slider 8 on second nut 6 is inserted into the limiting groove 9. Then, a set of fastening studs 4 are rotated, and the first nut is tightened through the fastening studs 4. 11 is pressed and fixed to fix the connection of the mounting sleeve 1; when it is necessary to adjust the compression length of the spring 5 to adjust the thrust on the first nut 11 and the second nut 6, the fastening stud 4 can be loosened, so that the second nut 6 can be rotated and moved on the screw body 7 by rotating the mounting sleeve 1 (or the fastening stud 4 can be loosened to rotate the first nut 11 and move on the screw body 7), so that the compression length of the spring 5 can be adjusted by changing the distance between the second nut 6 and the first nut 11, and then the fastening stud 4 can be tightened again after adjustment;

[0028] This nut structure, by setting two nuts, a first nut 11 and a second nut 6, on the lead screw body 7 and placing a spring 5 between the two nuts, generates a thrust that pushes the two nuts to both sides with the help of the mounting sleeve 1. This causes the inner thread of the first nut 11 to align with the outer thread of the lead screw body 7 to the left, and the inner thread of the second nut 6 to align with the outer thread of the lead screw body 7 to the right, thereby reducing the gap with the lead screw body 7. This reduces the risk of structural swaying and improves the accuracy of electric cylinders, electric slides, etc., using this structure. Furthermore, the distance between the first nut 11 and the second nut 6 can be adjusted to change the compression length of the spring 5, thus changing the magnitude of the thrust that pushes the two nuts to both sides.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A nut structure capable of eliminating lead screw backlash, comprising a lead screw body (7), characterized in that, The outer wall of the lead screw body (7) is fitted with an installation sleeve (1), and the left end of the installation sleeve (1) is provided with an installation structure for connecting the driven component. The installation sleeve (1) is fitted with a first nut (11) and a second nut (6) located on the left and right sides respectively. The inner threads on the inner walls of the first nut (11) and the second nut (6) are threaded to the outer threads on the outer wall of the lead screw body (7). The inner wall of the installation sleeve (1) is fixedly connected to the first nut (11) by a fastening structure. The outer wall of the second nut (6) is slidably connected to the installation sleeve (1) by a sliding limiting structure. The installation sleeve (1) is fitted with a spring (5), and the left and right ends of the spring (5) abut against the first nut (11) and the second nut (6) respectively.

2. The nut structure for eliminating lead screw backlash according to claim 1, characterized in that, The spring (5) includes a wave-shaped washer spring and the spring (5) does not contact the lead screw body (7).

3. The nut structure for eliminating lead screw backlash according to claim 1, characterized in that, The fastening structure includes fastening holes (3) and fastening studs (4). Several sets of fastening holes (3) are provided on the outer wall of the mounting sleeve (1), and a set of fastening holes (3) is internally threaded with fastening studs (4). One end of the fastening stud (4) located inside the mounting sleeve (1) abuts against the first nut (11).

4. The nut structure for eliminating lead screw backlash according to claim 3, characterized in that, The fastening stud (4) has a hexagonal hole on its end face outside the mounting sleeve (1) to facilitate the insertion of a hexagonal wrench and rotation of the fastening stud (4).

5. The nut structure for eliminating lead screw backlash according to claim 1, characterized in that, The sliding limiting structure includes limiting sliders (8) and limiting grooves (9). Several limiting grooves (9) are provided on the outer wall of the right end of the mounting sleeve (1), and the limiting grooves (9) are located on the right side of the first nut (11). Several limiting sliders (8) are integrally formed on the outer wall of the second nut (6), and the limiting sliders (8) are slidably disposed in several limiting grooves (9).

6. The nut structure for eliminating lead screw backlash according to claim 3, characterized in that, Several sets of fastening holes (3) are equidistantly arranged along the axial direction of the mounting sleeve (1), and the axes of several fastening holes (3) in one set point to the same point on the axis of the mounting sleeve (1).

7. The nut structure for eliminating lead screw backlash according to claim 1, characterized in that, The mounting structure includes a flange ring (2) and mounting holes (10). The flange ring (2) is integrally formed on the outer wall of the left end of the mounting sleeve (1). The flange ring (2) has several mounting holes (10) for fasteners such as screws on its side. The mounting holes (10) are arranged in a circular array on the flange ring (2) with the center of the flange ring (2) as the center.

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