Nut

Abstract

The utility model belongs to the technical field of transmission mechanisms, and particularly relates to a nut which comprises a nut body, and a connecting flange is arranged at one end of the nut body. The oil injection hole is formed in the side wall of the right end of the nut body and communicated with the interior of the nut body, and an oil liquid filtering piece is arranged on the oil injection hole; the sealing mechanisms are arranged at the two ends of the nut body and used for sealing oil in the nut body; the air hole is formed in the left end of the nut body and communicates with the interior of the nut body, and a throttling valve is arranged in the air hole; wherein the sealing mechanism is detachably connected with the nut body, and compared with the prior art, the transmission precision of the nut is effectively improved, and the service life of the nut is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission mechanisms, and in particular relates to a nut. Background Art

[0002] The nut is a main component of the ball screw transmission mechanism, also known as the screw nut. The ball screw also includes components such as balls, pre-loaded sheets, reversers, and dust collectors. It is a transmission mechanism that converts rotational motion into linear motion. For example, the patent with application number CN201520312224.6 discloses a double-nut series ball screw pair, which includes a screw rod, a main nut and a secondary nut installed on the screw rod. The secondary nut is fixed on the main nut, and a spring that is stretched outward is installed between the main nut and the secondary nut.

[0003] There are some problems with the existing ball screws that use springs to eliminate backlash. For example, the tension of the spring changes with the change of stroke, which easily causes changes in the transmission load and further affects the transmission accuracy. Therefore, it is necessary to make improvements. Utility Model Content

[0004] The purpose of the utility model is to provide a nut to effectively ensure the transmission accuracy of the nut of the ball screw in view of the above-mentioned technical problems.

[0005] In view of this, the utility model provides a nut, comprising:

[0006] A nut body, one end of which is provided with a connecting flange;

[0007] Also includes:

[0008] An oil filling hole, which is arranged on the side wall of the right end of the nut body and communicates with the interior of the nut body, and an oil filter is arranged on the oil filling hole;

[0009] A sealing mechanism, which is arranged at both ends of the nut body and is used to seal the oil inside the nut body;

[0010] An air hole, which is arranged at the left end of the nut body and communicates with the interior of the nut body, and a throttle valve is arranged in the air hole;

[0011] Wherein, the sealing mechanism is detachably connected to the nut body.

[0012] In the present technical scheme, after the nut body is assembled, the sealing mechanism is installed on both sides of the nut body. After the installation is completed, a pre-tightening force is applied to the nut, and then oil is injected into the nut body through the oil filling hole, and the throttle valve in the air hole is opened to exhaust the air. The internal pressure of the nut is increased by filling the oil between the nut and the screw, so that the ball and its contact surface are closely matched through hydraulic pressure, and the oil fills the space outside the contact area. The pressure difference generated by the pressure of the oil makes the two sides of the ball bear different forces, and then the purpose of eliminating the gap is achieved through pressure. At the same time, during the injection process of the oil, the oil filter can filter the impurities in the oil to prevent the impurities in the oil from entering the inside of the nut body and aggravating the wear between the nut body, the ball and the screw. Compared with the prior art, the utility model effectively improves the transmission accuracy of the nut and increases the service life of the nut.

[0013] In the above technical solution, further, the oil filter element also includes:

[0014] An outer tube, the outer tube is arranged in the oil filling hole, and an oil channel is arranged in the outer tube;

[0015] A first filter cartridge, wherein the first filter cartridge is arranged at the inlet end of the oil channel, and a plurality of first filter holes are arranged on the bottom surface of the first filter cartridge;

[0016] A second filter cartridge, the second filter cartridge is arranged in the oil channel and covers the outside of the first filter cartridge, and a plurality of second filter holes are arranged on the side surface and the bottom surface of the second filter cartridge;

[0017] The aperture of the second filter hole is smaller than that of the first filter hole, and the oil can flow from the first filter cartridge to the second filter cartridge.

[0018] In the above technical solution, further, the oil filter element also includes:

[0019] A magnetic bar, which is fixedly arranged on the bottom surface of the first filter cartridge and extends along the axial direction of the outer tube;

[0020] A plurality of filter layers, the plurality of filter layers are evenly spaced and distributed on the magnetic rod along the axis direction of the magnetic rod, the filter layers are cone barrel shaped, and the outer edge of the filter layers is provided with an annular baffle coaxial with the filter layers;

[0021] Wherein, the filter layer and the annular baffle are both provided with third filter holes.

[0022] In the above technical solution, further, the sealing mechanism also includes:

[0023] A sealing ring, wherein the sealing ring is arranged at the end of the nut;

[0024] A pressure plate is arranged on the surface of the sealing ring away from the nut and is used to press the sealing ring onto the nut.

[0025] In the above technical solution, further, the sealing ring also includes:

[0026] A pressure-bearing groove, the pressure-bearing groove is arranged on the inner side of the sealing ring in the circumferential direction, and an elastic sheet is arranged in the pressure-bearing groove;

[0027] The pressure-bearing portion is arranged in the pressure-bearing groove and can be deformed when under pressure to squeeze the elastic sheet.

[0028] Wherein, the cross-sectional shape of the elastic sheet matches the cross-sectional shape of the pressure-bearing groove.

[0029] The beneficial effects of the utility model are:

[0030] 1. By injecting oil into the nut body and then eliminating the gap through pressure, the transmission accuracy of the nut is improved;

[0031] 2. The oil filter is set to prevent impurities in the oil from entering the nut body, aggravating the wear between the nut body, ball and screw, thereby increasing the service life of the nut;

[0032] 3. The sealing performance of the nut body is improved by setting the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0034] Figure 1 It is a schematic structural diagram of a specific implementation method of the utility model.

[0035] Figure 2 It is a schematic diagram of the main structure of the nut body of the utility model.

[0036] Figure 3 It is a schematic diagram of the cross-sectional structure of the nut body of the utility model.

[0037] Figure 4 This is a schematic diagram of the structure of the oil filter element of the utility model.

[0038] Figure 5 This is a schematic diagram of the sealing ring structure of the utility model.

[0039] The symbols in the figure are:

[0040] 1- nut body, 2- connecting flange, 3- oil filling hole, 4- oil filter, 40- outer tube, 401- oil channel, 41- first filter cartridge, 42- second filter cartridge, 43- magnetic rod, 44- filter layer, 45- annular baffle, 5- sealing mechanism, 50- sealing ring, 501- pressure groove, 502- elastic sheet, 503- pressure part, 51- pressure plate, 6- air hole. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] Embodiment 1:

[0044] The embodiment of the present application provides a nut, comprising: a nut body 1, one end of the nut body 1 is provided with a connecting flange 2;

[0045] The nut body 1 further comprises: an oil filling hole 3, which is arranged on the side wall at the right end of the nut body 1 and communicates with the interior of the nut body 1, and an oil filter 4 is arranged on the oil filling hole 3; a sealing mechanism 5, which is arranged at both ends of the nut body 1 and is used to seal the oil inside the nut body 1; an air hole 6, which is arranged at the left end of the nut body 1 and communicates with the interior of the nut body 1, and a throttle valve is arranged in the air hole 6;

[0046] The sealing mechanism 5 is detachably connected to the nut body 1 .

[0047] In this embodiment, after the nut body 1 is assembled, the sealing mechanism 5 is installed on both sides of the nut body 1. After the installation is completed, a pre-tightening force is applied to the nut, and then oil is injected into the nut body 1 through the oil filling hole 2, and the throttle valve in the air hole 6 is opened to exhaust air. The internal pressure of the nut is increased by filling oil between the nut and the screw, so that the ball and its contact surface are tightly matched through hydraulic pressure, and the oil fills the space outside the contact area. The pressure difference generated by the pressure of the oil makes the two sides of the ball bear different forces, and then the purpose of eliminating the gap is achieved through pressure. At the same time, during the injection process of the oil, the oil filter 4 can filter impurities in the oil to prevent impurities in the oil from entering the nut body 1 and aggravating the wear between the nut body 1, the ball and the screw. Compared with the prior art, the utility model effectively improves the transmission accuracy of the nut and increases the service life of the nut.

[0048] Embodiment 2:

[0049] This embodiment provides a nut, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the oil filter 4 also includes: an outer tube 40, which is arranged in the oil filling hole 3, and an oil channel 401 is arranged in the outer tube 40; a first filter cartridge 41, which is arranged at the inlet end of the oil channel 401, and a plurality of first filter holes are arranged on the bottom surface of the first filter cartridge 41; a second filter cartridge 42, which is arranged in the oil channel 401 and is covered on the outside of the first filter cartridge 41, and a plurality of second filter holes are arranged on the side and bottom surface of the second filter cartridge 42;

[0050] The aperture of the second filter hole is smaller than that of the first filter hole, and the oil can flow from the first filter cartridge 41 to the second filter cartridge 42 .

[0051] The oil filter 4 further includes: a magnetic rod 43, which is fixedly arranged on the bottom surface of the first filter cartridge 41 and extends along the axial direction of the outer tube 40; a plurality of filter layers 44, which are evenly spaced and distributed on the magnetic rod 43 along the axial direction of the magnetic rod 43, and the filter layer 44 is cone-shaped, and an annular baffle 45 coaxial with the filter layer 44 is arranged on the outer edge of the filter layer 44;

[0052] The filter layer 44 and the annular baffle 45 are both provided with third filter holes.

[0053] Moreover, the filter layer 44 can be slidably connected to the magnetic rod 43, and the first filter cartridge 41, the second filter cartridge 42 and the outer tube 40 can be detachably connected to each other.

[0054] In this embodiment, during the injection of oil, the oil first passes through the several first filter holes of the first filter cartridge 41 for the first filtration when entering the oil channel 401, and the filtered oil flows downward and passes through the several filter layers 44 in sequence. The magnetic impurities in the oil can be attracted by the magnetic rod 43 in the process, and the oil can be filtered for the second time when passing through the filter layer 44, and finally the oil passes through the several second filter holes on the second filter cartridge 42 for the third filtration, and finally the oil enters the interior of the nut body 1 through the oil filling hole 2. At the same time, the filter layer 44 and the magnetic rod 43 can be set to be in sliding connection, and the first filter cartridge 41, the second filter cartridge 42 and the outer tube 40 are set to be detachably connected to each other. The user can clean the oil filter 4 by disassembling the oil filter 4. During the disassembly process, the impurities adsorbed on the magnetic rod 43 can be scraped off onto the filter layer 44 and collected on the inner side of the baffle. Compared with the prior art, the utility model can prevent impurities in the oil from entering the interior of the nut body 1, aggravating the wear between the nut body 1, the ball and the screw, thereby improving the service life of the nut.

[0055] Embodiment 3:

[0056] The present embodiment provides a nut, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features: the sealing mechanism 5 also includes: a sealing ring 50, which is arranged at the end of the nut body 1; a pressure plate 51, which is arranged on the surface of the sealing ring 50 away from the nut and is used to press the sealing ring 50 onto the nut.

[0057] The sealing ring 50 further includes: a pressure-bearing groove 501 , which is arranged on the circumferential inner side of the sealing ring 50 , and an elastic sheet 502 is arranged in the pressure-bearing groove 501 ; and a pressure-bearing portion 503 , which is arranged in the pressure-bearing groove 501 and can be deformed when under pressure to squeeze the elastic sheet 502 .

[0058] The cross-sectional shape of the elastic sheet 502 matches the cross-sectional shape of the pressure-bearing groove 501 .

[0059] Moreover, both ends of the nut body 1 are provided with recessed grooves for installing the pressure plate 51 and the sealing ring 50. The pressure plate 51 can be installed in the recessed groove and fixed by bolts. The pressure plate 51 is annular and a retaining ring can be provided on the circumferential inner wall of the pressure plate 51 for cooperating with the screw.

[0060] In this embodiment, after the sealing mechanism 5 is installed, when the pressure-bearing portion 503 is subjected to oil pressure, the pressure-bearing portion 503 is deformed by pressure and squeezes the elastic sheet 502. After being squeezed, the elastic sheet 502 is also deformed and expands to both sides, so that the pressure-bearing groove 501 is stretched open, and then the two sides of the sealing ring 50 are respectively close to the nut body and the pressure plate 51, so that the sealing performance of the sealing ring 50 can change and adapt according to the oil pressure, further improving the sealing performance of the sealing mechanism 5 and preventing oil leakage.

[0061] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A nut, comprising: A nut body (1), one end of the nut body (1) being provided with a connecting flange (2); It is characterized by further comprising: An oil filling hole (3), the oil filling hole (3) being arranged on the side wall of the right end of the nut body (1) and being in communication with the interior of the nut body (1), and an oil filter (4) being arranged on the oil filling hole (3); A sealing mechanism (5), wherein the sealing mechanism (5) is arranged at both ends of the nut body (1) and is used to seal the oil inside the nut body (1); an air hole (6), the air hole (6) being arranged at the left end of the nut body (1) and being in communication with the interior of the nut body (1), and a throttle valve being arranged in the air hole (6); Wherein, the sealing mechanism (5) is detachably connected to the nut body (1).

2. A nut according to claim 1, characterized in that: The oil filter (4) further comprises: An outer tube (40), the outer tube (40) being arranged in the oil filling hole (3), and an oil channel (401) being arranged in the outer tube (40); A first filter cartridge (41), the first filter cartridge (41) being arranged at the inlet end of the oil channel (401), and a plurality of first filter holes being arranged on the bottom surface of the first filter cartridge (41); A second filter cartridge (42), the second filter cartridge (42) being arranged in the oil channel (401) and covering the outside of the first filter cartridge (41), and a plurality of second filter holes being arranged on the side surface and the bottom surface of the second filter cartridge (42); The aperture of the second filter hole is smaller than the aperture of the first filter hole, and the oil can flow from the first filter cartridge (41) to the second filter cartridge (42).

3. A nut according to claim 2, characterized in that: The oil filter (4) further comprises: A magnetic bar (43), wherein the magnetic bar (43) is fixedly arranged on the bottom surface of the first filter cartridge (41) and extends along the axial direction of the outer tube (40); A plurality of filter layers (44), the plurality of filter layers (44) are evenly spaced and distributed on the magnetic rod (43) along the axis direction of the magnetic rod (43), the filter layers (44) are cone-barrel shaped, and an annular baffle (45) coaxial with the filter layers (44) is provided at the outer edge of the filter layers (44); Wherein, the filter layer (44) and the annular baffle (45) are both provided with third filter holes.

4. A nut according to claim 1, characterized in that: The sealing mechanism (5) further comprises: A sealing ring (50), wherein the sealing ring (50) is arranged at an end of the nut body (1); A pressure plate (51) is arranged on a surface of the sealing ring (50) away from the nut and is used to press the sealing ring (50) onto the nut.

5. A nut according to claim 4, characterized in that: The sealing ring (50) further comprises: A pressure-bearing groove (501), the pressure-bearing groove (501) being arranged on the inner side of the sealing ring (50) in the circumferential direction, and an elastic sheet (502) being arranged in the pressure-bearing groove (501); A pressure-bearing portion (503), wherein the pressure-bearing portion (503) is disposed in the pressure-bearing groove (501) and can deform when under pressure to squeeze the elastic sheet (502); Wherein, the cross-sectional shape of the elastic sheet (502) matches the cross-sectional shape of the pressure-bearing groove (501).

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