Universal clearance eliminating nut

Abstract

The utility model discloses a universal clearance eliminating nut, which comprises a nut body and a connecting seat, one end of the nut body is fixed with the connecting seat, the nut body comprises a plurality of parting grooves which are arranged along the axial direction of the nut body on the peripheral surface, and the parting grooves are communicated with an internal thread hole of the nut body to divide the nut body into a plurality of petal bodies. Each petal body is provided with a groove arranged in the circumferential direction of the nut body. An elastic component is further included and matched with the grooves located in the same circumference. The gap between the nut and the screw can be eliminated.

Description

Technical Field

[0001] The utility model relates to a backlash elimination component used in a stepping screw motor, in particular to a general-purpose backlash elimination nut. Background Art

[0002] In the current field of motion automation, the external drive stepping motor uses a screw-nut drive to convert electrical pulses into an actuator for angular displacement and position displacement, which is widely used in industrial equipment and occupies an important position.

[0003] With the increasing requirement for precision, especially for motion control systems, the screw and nut will show some wear after a period of use, resulting in a gap between the screw and the nut. The gap will cause position errors when the screw or nut is moving, thus affecting the motor performance, so it has become an issue that cannot be ignored.

[0004] Currently, using a backlash elimination nut to eliminate the gap between the transmission nut and the screw to obtain high-precision lead control is widely used in the field of stepping motors. Traditional backlash elimination nuts are all specially designed and require custom molds, which are costly. Summary of the Utility Model

[0005] The utility model provides a general-purpose backlash elimination nut, which can eliminate the gap between the nut and the screw.

[0006] The technical solution to solve the above technical problems is as follows:

[0007] The general-purpose backlash elimination nut includes a nut body and a connecting seat. One end of the nut body is fixed to the connecting seat. The circumferential surface of the nut body is provided with parting grooves arranged along the axial direction of the nut body. There are multiple parting grooves that penetrate the internal thread hole of the nut body to divide the nut body into multiple lobes. Each lobe is provided with a groove arranged along the circumferential direction of the nut body;

[0008] It further includes an elastic component, which cooperates with the grooves located on the same circumference.

[0009] Furthermore, one end of each lobe connected to the connecting seat is provided with a depression, and the depression is located on the circumferential surface of the lobe.

[0010] Furthermore, the lobe is also provided with a mounting groove that penetrates the groove. The mounting groove is arranged along the axial direction of the lobe. A positioning block is fixed on the elastic component, and the positioning block cooperates with the mounting groove.

[0011] Furthermore, the grooves arranged on each lobe are multiple and are distributed along the axial direction of the lobe. Adjacent lobes have an angular difference in the circumferential direction.

[0012] Further, the grooves located on the same circumference cooperate end to end to form a C-shaped groove, and the elastic component is a C-shaped spring.

[0013] The advantages of the present utility model are as follows:

[0014] In the present utility model, based on the existing nut body, through machining, a parting groove and a groove are formed on the nut body. After installing the processed nut on the screw rod, an elastic component for generating a contraction acting force on the flap body is installed in the groove. Therefore, the clearance-eliminating nut of the present utility model is simply assembled.

[0015] The clearance-eliminating nut of the present utility model is composed of two parts. It is not only relatively simple in structure, but also can be obtained by improving the existing nut, without the need to separately design and manufacture a mold. Therefore, the present utility model also has the advantage of low cost. Description of the Drawings

[0016] Figure 1 It is an exploded view of the first general type of clearance-eliminating nut.

[0017] Figure 2 It is a schematic diagram of two elastic components.

[0018] Figure 3 It is an assembly drawing of the first general type of clearance-eliminating nut and the screw rod.

[0019] Figure 4 It is an exploded view of the second general type of clearance-eliminating nut.

[0020] Figure 5 It is an exploded view of the third general type of clearance-eliminating nut.

[0021] Marks in the drawings: nut body 1, flap body 1a, connecting seat 2, parting groove 3, groove 4, elastic component 5, depression 6, installation groove 7, positioning block 8, screw rod 9. Detailed Description of the Preferred Embodiments

[0022] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In the present utility model, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0027] As Figure 1 shown, the general anti-backlash nut of the present utility model includes a nut body 1, a connecting seat 2, and an elastic member 5. One end of the nut body 1 is fixed to the connecting seat 2. The circumferential surface of the nut body 1 is provided with parting grooves 3 arranged along the axial direction of the nut body 1. There are a plurality of parting grooves 3 and they communicate with the internal threaded hole of the nut body 1 to divide the nut body 1 into a plurality of lobes 1a. In this embodiment, the number of parting grooves 3 is two, and thus the number of lobes 1a is also two.

[0028] Each lobe 1a is provided with a groove 4 arranged along the circumferential direction of the nut body 1. The depth of the groove 4 is one-half to two-thirds of the thickness of the lobe 1a, and preferably one-half of the thickness of the lobe 1a. The parting grooves 3 and the grooves 4 can be obtained by machining on the basis of the existing nut body 1 (the nut body 1 can be an existing standard nut), and the anti-backlash effect can be achieved after assembly.

[0029] The grooves provided on each valve body 1a can be one or more. In this embodiment, there is one groove on each valve body 1a, and the elastic member 5 cooperates with the grooves 4 located on the same circumference. The elastic member 5 generates a radial contraction force on the valve body 1a, so that the valve body 1a remains in cooperation with the screw, eliminating the gap between the screw 9 and the nut body 1 (such as Figure 3 ).

[0030] In this embodiment, the grooves 4 located on the same circumference cooperate end to end to form a C-shaped groove. The elastic member 5 is a C-shaped spring, and the diameter of the C-shaped spring is smaller than the depth of the groove 4. Therefore, after the C-shaped spring is installed in the groove 4, the C-shaped spring is located inside the groove 4, that is, the C-shaped spring does not protrude beyond the circumferential surface of the valve body 1a. In this way, C-shaped springs with different diameters can also be installed in the groove 4 (such as Figure 2 ), and C-shaped springs with different straight lines have different resistance moments.

[0031] One end of each valve body 1a connected to the connecting seat 2 is provided with a recess 6, and the recess 6 is located on the circumferential surface of the valve body 1a. The rigidity of one end of the valve body 1a can be reduced through the recess 6. When a gap appears between the screw 9 and the nut body 1, under the contraction force of the elastic member 5, it is convenient for the valve body 1a to swing, thereby eliminating the gap between the screw 9 and the nut body 1.

[0032] Such as Figure 4 shown, the valve body 1a is further provided with an installation groove 7 communicating with the groove 4. The installation groove 7 is arranged along the axial direction of the valve body 1a. A positioning block 8 is fixed on the elastic member 5, and the positioning block 8 cooperates with the installation groove 7. After the positioning block 8 cooperates with the installation groove 7, it can prevent the elastic member 5 from coming out of the groove 4, thereby ensuring the contraction force generated by the elastic member 5 on the valve body 1a, and further ensuring that the gap between the screw 9 and the nut is always effectively eliminated.

[0033] The positioning block 8 can be integrally formed with the elastic member 5 by casting or bending, or the positioning block 8 can be made to be connected with the elastic member 5 by welding. In this embodiment, preferably, both ends of the elastic member 5 are bent to form the positioning block 8, and an installation hole is provided on the positioning block 8. A screw passes through the installation hole and is threadedly connected to a threaded hole (the threaded hole is arranged on the groove wall surface of the installation groove 7) on the valve body 1a to fasten the positioning block 8 to the valve body 1a.

[0034] A plurality of grooves 4 arranged on each valve body 1a are distributed along the axial direction of the valve body 1a, such as Figure 5As shown, there are two grooves 4 arranged on each lobe 1a and distributed along the axial direction of the lobe 1a. Since the grooves 4 located on the same circumference cooperate end to end to form a C-shaped groove, in this embodiment, there are two C-shaped grooves, and the two C-shaped grooves have an angular difference in the circumferential direction, and the angular difference is 60 to 90 degrees. With this structure, two elastic members 5 can be installed on the nut body 1. Since the two elastic members 5 have an angular difference in the circumferential direction, the clearance between the screw 9 and the nut body 1 can be better eliminated.

Claims

1. A universal anti-backlash nut, comprising a nut body (1) and a connecting seat (2), wherein one end of the nut body (1) is fixed to the connecting seat (2), and is characterized in that: The nut body (1) includes a circumferential surface provided with a parting groove (3) arranged along the axial direction of the nut body (1), the parting groove (3) is multiple and penetrates the internal threaded hole of the nut body (1) so that the nut body (1) is divided into multiple petals (1a), and each petal (1a) is provided with a groove (4) arranged along the circumferential direction of the nut body (1); It also comprises an elastic component (5), which cooperates with the groove (4) located on the same circumference.

2. The universal anti-backlash nut according to claim 1, characterized in that: One end of each petal body (1a) connected to the connecting seat (2) is provided with a recess (6), and the recess (6) is located on the circumferential surface of the petal body (1a).

3. The universal anti-backlash nut according to claim 1, characterized in that: The petal body (1a) is also provided with a mounting groove (7) which is connected to the groove (4), and the mounting groove (7) is arranged along the axial direction of the petal body (1a). A positioning block (8) is fixed on the elastic component (5), and the positioning block (8) cooperates with the mounting groove (7).

4. The universal anti-backlash nut according to any one of claims 1 to 3, characterized in that: There are multiple grooves (4) arranged on each petal body (1a) and they are distributed along the axial direction of the petal body (1a).

5. The universal anti-backlash nut according to any one of claims 1 to 3, characterized in that: The grooves (4) located on the same circumference cooperate end to end to form a C-shaped groove, and the elastic component (5) is a C-shaped spring.

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