Compact ball screw nut coupling universal joint structure

Abstract

The present application belongs to the field of mechanical structure design, and particularly relates to a compact type screw nut coupling universal joint structure. The structure comprises a screw, a nut with a connecting pin, a vertical direction joint bearing, a universal joint frame, a plug with an anti-rotation function, a fixing screw, a horizontal direction joint bearing and a driven structure. The nut with the connecting pin is sleeved with the screw, the nut with the connecting pin is connected with the universal joint frame through the vertical direction joint bearing at the longitudinal two ends of the nut with the connecting pin, and the universal joint frame is connected with the driven structure through the horizontal direction joint bearing at the transverse two ends of the universal joint frame.

Description

Technical Field

[0001] This invention belongs to the field of mechanical structure design, specifically relating to a compact universal joint structure for connecting a lead screw and nut. Background Technology

[0002] In the mechanical structure design of electromechanical actuators, the lead screw and nut are frequently used transmission pairs, mainly for the conversion between linear and rotary motion. To improve the rigidity and stability of electromechanical actuators, a transmission form where the lead screw rotates and the nut provides linear output is usually chosen. The connection between the nut (which performs linear motion) and the driven structure can take many forms, with screw and pin connections being the most common. While this connection method is relatively simple, under complex load conditions, it can easily introduce external bending moments into the lead screw and nut, reducing their service life and consequently affecting the reliability and safety of the electromechanical actuator. Summary of the Invention

[0003] The purpose of this invention is to propose a compact universal joint structure for connecting a lead screw and nut, thereby increasing the reliability and safety of electromechanical actuators.

[0004] Technical solution:

[0005] A compact screw-nut universal joint structure is provided, comprising: a screw, a nut with a built-in connecting pin, a vertical spherical bearing, a universal joint frame, a pin with anti-rotation function, a fixing screw, a horizontal spherical bearing, and a driven structure.

[0006] A lead screw with a nut and connecting pin.

[0007] The nuts with connecting pins have connecting pins at both longitudinal ends that are connected to the universal joint frame via vertical spherical bearings. The universal joint frame has anti-rotation pins at both transverse ends that are connected to the driven structure via horizontal spherical bearings.

[0008] Furthermore, the diagonal length of the inner frame of the universal joint is greater than the distance between the two end faces of the self-connecting pins, which is greater than the length and width of the inner frame.

[0009] The universal joint frame is provided with bearing mounting holes for installing vertical spherical bearings, and the mounting holes are provided with inclined grooves along the same direction of rotation.

[0010] During the process of connecting the nuts with connecting pins at both ends of the longitudinal direction to the universal joint frame through the vertical spherical bearings, the nuts with connecting pins are first placed into the universal joint frame diagonally, and then rotated along the inclined groove until the connecting pins are concentric with the bearing mounting holes. The vertical spherical bearings are then installed in the gap between the connecting pins and the bearing mounting holes.

[0011] Furthermore, the inclined surface of the sloping groove serves as the guide surface for the nut with the connecting pin to enter the sloping groove. The starting point of the guide surface coincides with the diagonal endpoint of the inner frame, and the guide surface is perpendicular to the diagonal.

[0012] Furthermore, stepped holes with a smaller inner diameter and a larger outer diameter are opened at both ends of the universal joint frame, and positioning grooves are provided on the stepped surfaces;

[0013] The anti-rotation pin includes a main body section with a flange and a locating key; the main body section has a center opening and a locating key is set on the lower end face of the main body section; the main body section is fitted with a horizontal spherical bearing, one end of which abuts against the flange end face; the main body section exposed outside the horizontal spherical bearing has a large hole that passes through the stepped hole and abuts against the stepped surface, and the locating key and locating groove cooperate to prevent the anti-rotation pin from rotating.

[0014] Furthermore, the universal joint structure also includes baffles;

[0015] The baffle includes a square flange section and a threaded section; the threaded section extends downward from the center of the square flange section; the square flange section covers the upper end face of the vertical spherical plain bearing; the threaded section is screwed into the threaded holes at the center of the connecting pins at both ends of the nut with its own connecting pin to prevent the vertical spherical plain bearing 3 from coming out.

[0016] Furthermore, the universal joint structure also includes fixing screws;

[0017] The fixing screw passes through the transverse center through hole of the pin with built-in anti-rotation function and connects to the threaded hole in the horizontal direction of the universal joint frame to prevent the pin with built-in anti-rotation function from coming out along its axial direction.

[0018] Furthermore, a fuse hole is made on the flange, and a fuse hole is made on the nut of the fixing screw. After the two are tightened together, the same fuse is inserted to achieve the anti-loosening function.

[0019] Furthermore, the anti-rotation pin, which serves as a load-bearing component, is made of steel.

[0020] The beneficial effects of this invention are as follows: This invention designs a compact universal joint structure for a lead screw and nut. A nut with a built-in connecting pin is connected to the universal joint frame via a spherical bearing. A retaining plate is screwed into the outside of the connecting pin to prevent the spherical bearing from dislodging. The universal joint frame is connected to the driven mechanism via a pin with a built-in anti-rotation function, also via a spherical bearing. A fixing screw is screwed into the anti-rotation pin to increase load-bearing strength and prevent the pin from dislodging. This universal joint structure eliminates the bending moment introduced by the driven structure under complex working conditions, improves the service life of the lead screw and nut, and increases the reliability and safety of the electromechanical actuator. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a compact screw-nut universal joint structure.

[0022] Figure 2 This is a cross-sectional view of a compact universal joint structure for connecting a lead screw and nut.

[0023] Figure 3 This is a schematic diagram of a lead screw nut with a built-in connecting pin.

[0024] Figure 4 This is a schematic diagram of a universal joint frame.

[0025] Figure 5 This is a schematic diagram of the installation of a lead screw nut with a built-in connecting pin and a universal joint frame.

[0026] Figure 6 This is a sectional view of the universal joint frame.

[0027] Figure 7 This is a schematic diagram of the baffle structure.

[0028] Figure 8 This is a schematic diagram of the horizontal pin interface of the universal joint frame.

[0029] Figure 9 This is a schematic diagram of a latch with built-in anti-rotation function.

[0030] Figure 10 This is a schematic diagram of the fixing screw.

[0031] Figure 11 This is a schematic diagram of the connection interface of the driven structure.

[0032] Among them, 1: lead screw, 2: nut with built-in connecting pin, 3: vertical joint bearing, 4: baffle, 5: universal joint frame, 6: pin with built-in anti-rotation function, 7: fixing screw, 8: horizontal joint bearing, 9: driven structure. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0034] In the description of this invention, it should be understood that the terms "center", "axial", "vertical", "upper", "lower", "upper end", "bottom end", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0035] This invention provides a compact universal joint structure for connecting a lead screw and nut, such as... Figure 1-2 As shown, it includes lead screws 1 and 2; nut 2 with a connecting pin; vertical joint bearing 3; baffle 4; universal joint frame 5; pin with anti-rotation function 6; fixing screw 7; horizontal joint bearing 8; driven structure 9.

[0036] like Figure 3-6 As shown, the nut 2 with connecting pin is fitted with the lead screw 1. The nut 2 with connecting pin has connecting pins at both ends in the longitudinal direction and is connected to the universal joint frame 5 through the vertical joint bearing 3. The universal joint frame 5 has anti-rotation pins 6 at both ends in the transverse direction and is connected to the driven structure 9 through the horizontal joint bearing 8.

[0037] The diagonal length of the inner frame of the universal joint frame 5 is greater than the distance between the two end faces of the self-contained connecting pins, which is greater than the length and width of the inner frame.

[0038] The universal joint frame 5 is provided with bearing mounting holes for installing vertical joint bearings 3, and the mounting holes are provided with inclined grooves along the same direction of rotation.

[0039] During the process of connecting the nuts 2 with connecting pins at both longitudinal ends to the universal joint frame 5 via the vertical spherical bearings 3, the nuts 2 with connecting pins are first placed into the universal joint frame 5 diagonally, and rotated along the inclined groove until the connecting pins are concentric with the bearing mounting holes. The vertical spherical bearings 3 are then installed in the gap between the connecting pins and the bearing mounting holes.

[0040] The inclined surface of the sloping groove serves as the guide surface for the nut 2 with the connecting pin to enter the sloping groove. The starting point of the guide surface coincides with the diagonal endpoint of the inner frame, and the guide surface is perpendicular to the diagonal.

[0041] The universal joint frame 5 has stepped holes with a smaller inner diameter and a larger outer diameter at both ends of the horizontal direction, and positioning grooves are provided on the stepped surfaces.

[0042] The anti-rotation pin 6 includes a main body section with a flange and a positioning key; the main body section has a central opening and a positioning key is provided on the lower end face of the main body section; the main body section is fitted with a horizontal spherical bearing 8, one end of which abuts against the flange end face; the main body section exposed outside the horizontal spherical bearing 8 has a large hole that passes through the stepped hole and abuts against the stepped surface; the positioning key and the positioning groove cooperate to prevent the anti-rotation pin 6 from rotating.

[0043] like Figure 7 As shown, the baffle 4 includes a square flange section and a threaded section; the threaded section extends downward from the center of the square flange section; the square flange section covers the upper end face of the vertical spherical bearing 3; the threaded section is screwed into the threaded holes at both ends of the nut 1 with its own connecting pin to prevent the vertical spherical bearing 3 from coming out.

[0044] like Figure 8-10 As shown, the fixing screw 7 passes through the transverse center through hole of the pin 6 with built-in anti-rotation function and connects to the threaded hole in the horizontal direction of the universal joint frame 5 to prevent the pin 6 with built-in anti-rotation function from coming out along its axial direction.

[0045] A fuse hole is made on the flange, and a fuse hole is made on the nut of the fixing screw 7. After the two are tightened together, the same fuse is inserted to achieve the anti-loosening function.

[0046] The self-contained anti-rotation pin 6 is made of steel as a load-bearing component.

[0047] The nut 2 with its own connecting pin is connected to the universal joint frame 5 through the vertical joint bearing 3. The baffle 4 is screwed into the threaded hole at the center of the connecting pin on both sides of the nut 2 with its own connecting pin to prevent the vertical joint bearing 3 from coming out.

[0048] like Figure 11 As shown, the universal joint frame 5 is connected to the driven structure 9 through the anti-rotation pin 6 and the horizontal spherical bearing 8. The fixing screw 7 passes through the central through hole of the anti-rotation pin 6 and connects to the horizontal threaded hole of the universal joint frame 5 to prevent the anti-rotation pin 6 from coming out along its axial direction.

[0049] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0050] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A compact universal joint structure for connecting a lead screw and nut, characterized in that, include: Lead screw (1), nut with connecting pin (2), vertical joint bearing (3), universal joint frame (5), anti-rotation pin (6), fixing screw (7), horizontal joint bearing (8), driven structure (9); Nut (2) with connecting pin, inner sleeve screw (1), The nut (2) with connecting pins has connecting pins at both longitudinal ends and is connected to the universal joint frame (5) through vertical joint bearings (3). The universal joint frame (5) has anti-rotation pins (6) at both transverse ends and is connected to the driven structure (9) through horizontal joint bearings (8).

2. The structure according to claim 1, characterized in that, The diagonal length of the inner frame of the universal joint frame (5) is greater than the distance between the two end faces of the self-contained connecting pins, which is greater than the length and width of the inner frame. The universal joint frame (5) is provided with bearing mounting holes for mounting vertical joint bearings (3), and the mounting holes are provided with inclined grooves along the same direction of rotation. During the process of connecting the nuts (2) with connecting pins at both ends of the longitudinal direction to the universal joint frame (5) through the vertical joint bearing (3), first place the nuts (2) with connecting pins into the universal joint frame (5) diagonally, rotate along the inclined groove until the connecting pins are concentric with the bearing mounting holes, and install the vertical joint bearing (3) in the gap between the connecting pins and the bearing mounting holes.

3. The structure according to claim 2, characterized in that, The inclined surface of the sloping groove serves as the guide surface for the nut (2) with the connecting pin to enter the sloping groove. The starting point of the guide surface coincides with the diagonal endpoint of the inner frame, and the guide surface is perpendicular to the diagonal.

4. The structure according to claim 1, characterized in that, The universal joint frame (5) has stepped holes with a smaller inner diameter and a larger outer diameter at both ends of the horizontal direction, and positioning grooves are provided on the stepped surfaces. The self-anti-rotation pin (6) includes a main body section with a flange and a positioning key; the main body section has a central opening and a positioning key is provided on the lower end face of the main body section; the main body section is fitted with a horizontal spherical bearing (8), one end of which abuts against the flange end face; the main body section exposed outside the horizontal spherical bearing (8) passes through the large hole of the stepped hole and abuts against the stepped surface; the positioning key and the positioning groove cooperate to prevent the self-anti-rotation pin (6) from rotating.

5. The structure according to claim 1, characterized in that, It also includes a baffle (4); The baffle (4) includes a square flange section and a threaded section; the threaded section extends downward from the center of the square flange section; the square flange section covers the upper end face of the vertical spherical bearing (3); the threaded section is screwed into the threaded holes at the center of the nuts (1) with their own connecting pins to prevent the vertical spherical bearing 3 from coming out.

6. The structure according to claim 4, characterized in that, It also includes fixing screws (7); The fixing screw (7) passes through the transverse center through hole of the self-anti-rotation pin (6) and connects to the threaded hole in the horizontal direction of the universal joint frame (5) to prevent the self-anti-rotation pin (6) from coming out along its axial direction.

7. The structure according to claim 6, characterized in that, A fuse hole is made on the flange, and a fuse hole is made on the nut of the fixing screw (7). After the two are tightened together, the same fuse is inserted to achieve the anti-loosening function.

8. The structure according to claim 1, characterized in that, The self-contained anti-rotation pin (6) is made of steel as a load-bearing component.

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