Lead screw transmission structure

Abstract

The utility model relates to the technical field of machine tool equipment, in particular to a lead screw transmission structure which comprises a lead screw, the two ends of the lead screw are connected with a first bearing seat and a second bearing seat respectively, at least two supporting bearings are arranged at the joint of the lead screw and the first bearing seat and the joint of the lead screw and the second bearing seat respectively, and each supporting bearing comprises an inner ring and an outer ring. The edge of one side outside the inner ring extends outwards in the circumferential direction to form a mounting part, the ball is rotationally embedded in the side surface of the mounting part in the circumferential direction, the outer ring rotationally sleeves the outer side of the mounting part, the mounting part axially supports the ball, and at least two supporting bearings arranged at the same end on the lead screw are symmetrically arranged in the radial direction of the lead screw. The lead screw transmission structure has the advantages that the situation that the transmission efficiency is reduced due to bearing deformation or deflection after the lead screw transmission structure is used for a long time is avoided, the transmission efficiency of the lead screw transmission structure is improved, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of machine tool equipment, and in particular to a lead screw transmission structure. Background Art

[0002] The five-axis machining center has the ability to move five axes independently. It can process workpieces at different angles through the rotation axes (A and C) based on the three linear axes X, Y, and Z. In the prior art, the linear screw guide rails used in the five-axis machining center are equipped with screw support bearings. However, after a period of use, the weight of the component itself or the load of the machine can easily cause the support bearings to deflect or deform, thereby affecting the stability of the machining center and the machining quality. Utility Model Content

[0003] In order to solve the problem in the prior art that the internal bearings of the screw structure in the existing five-axis machining center are prone to deformation after long-term use, thereby affecting the stability and machining accuracy of the machining center, the present application provides a screw transmission structure.

[0004] A screw transmission structure provided in the present application adopts the following technical solution: a screw transmission structure, including a screw, with a first bearing seat and a second bearing seat connected to both ends of the screw respectively, and at least two supporting bearings are arranged at the connection between the screw and the first bearing seat and the second bearing seat, the supporting bearings include an inner ring, a ball and an outer ring, and the edge of one side of the outer ring extends outward along the circumferential direction to form a mounting portion, the ball is embedded in the side surface of the mounting portion along the circumferential direction, and the outer ring is rotatably sleeved on the outside of the mounting portion, and the mounting portion axially supports the ball, and the at least two supporting bearings arranged at the same end of the screw are symmetrically arranged along the radial direction of the screw.

[0005] By adopting the above technical solution, a mounting portion is provided on the inner ring of the supporting bearing, and the ball is installed on the side of the mounting portion. The provision of the mounting portion improves the axial structural strength of the supporting bearing. A plurality of supporting bearings are provided at the connection between the screw and the first bearing seat and the second bearing seat, and the supporting bearings at the same end are symmetrically arranged, so that the axial structural strength between the screw and the first bearing seat and the second bearing seat is improved by the supporting bearings. During the long-term operation of the screw, the supporting bearing is not easily deformed, thereby extending the service life of the screw transmission structure.

[0006] Optionally, both ends of the connection between the lead screw and the first bearing seat are threadedly connected with a precision nut and a first locking nut, respectively, and the precision nut and the first locking nut cooperate to press and fix a plurality of the supporting bearings.

[0007] By adopting the above technical solution, the precision nut and the first locking nut axially compress the multiple supporting shafts, thereby fixing the supporting bearings and improving the axial strength of the supporting bearings.

[0008] Optionally, a first spacer and a second spacer are arranged between the precision nut, the first locking nut and the support bearing.

[0009] By adopting the above technical solution, the spacer is used to adjust the clearance and preload of the supporting bearing, so that the force of the first locking nut and the precision nut pressing the inner ring of the supporting bearing can be more uniform, and the supporting bearing can be protected from damage.

[0010] Optionally, a first end cover is provided at the connection between the lead screw and the first bearing seat, and the first end cover is fixedly connected to the first bearing seat.

[0011] By adopting the above technical solution, the end of the lead screw is connected to the first bearing seat through the first end cover, thereby improving the structural strength of the connection between the lead screw and the first bearing seat.

[0012] Optionally, a second end cover is provided at the connection between the lead screw and the second bearing seat, the second end cover is fixedly connected to the second bearing seat, and a second locking nut for locking and fixing the second end cover is provided at the end of the lead screw.

[0013] By adopting the above technical solution, the end of the screw is connected to the second bearing seat through the second end cover, which improves the structural strength of the connection between the screw and the second bearing seat and facilitates the installation and disassembly of the screw.

[0014] Optionally, a second spacer sleeve is provided between the support bearing and the second end cover.

[0015] By adopting the above technical solution, the spacer is used to adjust the clearance and preload of the supporting bearing, so that the force of the second end cover pressing the inner ring of the supporting bearing can be more uniform, and the supporting bearing can be protected from damage.

[0016] Optionally, a dust cover is provided at the end of the lead screw connected to the first bearing seat.

[0017] By adopting the above technical solution, the dust cover is used to prevent dust from entering the first bearing seat and the interior of the lead screw, thereby increasing the service life of the first bearing seat and the lead screw.

[0018] Optionally, a screw nut is threadedly connected to the screw, and a buffer pad is arranged between the first bearing seat, the second bearing seat and the screw nut.

[0019] By adopting the above technical solution, the buffer pad is used to buffer the lead screw nut to prevent the lead screw nut from colliding with the first bearing seat and the second bearing seat during movement and causing damage.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] In the present application, multiple supporting bearings are arranged between the two ends of the screw and the first bearing seat and the second bearing seat. The supporting bearings are symmetrically arranged along the radial direction of the screw. The supporting bearings improve the axial structural strength between the screw and the first bearing seat and the second bearing seat, avoiding the situation where the transmission efficiency is reduced due to bearing deformation or deflection of the screw transmission structure after long-term use, thereby improving the transmission efficiency of the screw transmission structure and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a screw transmission structure in an embodiment of the present application.

[0023] Figure 2 It is a schematic diagram of the internal structure of a screw transmission structure in an embodiment of the present application.

[0024] Figure 3 It is a screw transmission structure in the embodiment of the present application. Figure 2 Schematic diagram of the local A enlarged structure.

[0025] Figure 4 It is a screw transmission structure in the embodiment of the present application. Figure 2 Schematic diagram of the local enlarged structure of B.

[0026] Figure 5 It is a schematic diagram of a supporting bearing structure of a screw transmission structure in an embodiment of the present application.

[0027] Explanation of the accompanying drawings: 1. screw; 2. first bearing seat; 3. second bearing seat; 4. motor; 5. screw nut; 6. supporting bearing; 61. outer ring; 62. inner ring; 63. mounting portion; 64. ball; 7. first spacer; 8. precision nut; 9. second spacer; 10. first locking nut; 11. dust cover; 12. buffer pad; 13. first end cover; 14. second end cover; 15. sealing ring; 16. second locking nut. DETAILED DESCRIPTION

[0028] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0029] See also Figure 1-5. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of this application, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical content disclosed in this application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this application. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this application without substantially changing the technical content.

[0030] The following is combined with Figure 1-5 This application is described in further detail.

[0031] This embodiment discloses a screw transmission structure.

[0032] Reference Figure 1 A screw transmission structure includes a screw 1, a screw nut 5 is threadedly connected to the screw 1, one end of the screw 1 is connected to the first bearing seat 2, and the other end is connected to the second bearing seat 3, one side of the second bearing seat 3 is connected to the motor 4, the output shaft of the motor 4 is connected to the screw 1 for transmission, and a buffer pad 12 is also provided at the connection between the screw 1 and the first bearing seat 2 and the second bearing seat 3, and a dust cover 11 is provided at the end cover of the screw 1 connected to the first bearing seat 2.

[0033] Reference Figure 2 and Figure 3 Three supporting bearings 6 are arranged inside the connection between the screw 1 and the first bearing seat 2, and the three supporting bearings 6 are sleeved on the screw 1. The two supporting bearings 6 away from the second bearing seat 3 are arranged opposite to the other supporting bearing 6. A precision nut 8 and a first locking nut 10 are threadedly connected to the screw 1. The precision nut 8 and the first locking nut 10 are respectively arranged on both sides of the supporting bearing 6, and the three supporting bearings 6 are pressed and fixed. A second spacer 9 is arranged between the precision nut 8 and the supporting bearing 6, and a first end cover 13 is sleeved on the outer side of the second spacer 9. The first end cover 13 is fixedly connected to the first bearing seat 2. The edge of the second spacer 9 extends outward to form a groove, and the groove is in the first end cover 13 to cooperate with the dynamic sealing structure, and a first spacer 7 is arranged between the first locking nut 10 and the supporting bearing 6.

[0034] Reference Figure 2 and Figure 4Four supporting bearings 6 are arranged at the connection between the screw 1 and the second bearing seat 3, and the four supporting bearings 6 are symmetrically arranged in pairs. A second end cover 14 is arranged at the end of the screw 1, and the second end cover 14 is fixedly connected to the second bearing seat 3. A second spacer is arranged between the second end cover 14 and the screw 1, and the edge of the second spacer 9 extends outward to form a groove, and the groove is in the second end cover 14 to cooperate with the dynamic sealing structure to form a dynamic sealing structure. A second locking nut 16 is threadedly connected to the end of the screw 1, and the second locking nut 16 locks and fixes the second end cover 14 and the supporting bearing 6. A sealing ring 15 is also arranged at the connection between the screw 1 and the second bearing seat 3.

[0035] Reference Figure 5 The supporting bearing 6 includes an inner ring 62 and an outer ring 61. The outer edge of the inner ring 62 extends outward along the circumferential direction to form a mounting portion 63. The ball 64 is embedded in the side surface of the mounting portion 63 along the circumferential direction. The interior of the outer ring 61 is arranged in a stepped shape. The outer ring 61 is rotatably sleeved on the outside of the mounting portion 63. The mounting portion 63 and the steps inside the outer ring 61 axially limit the ball 64, thereby improving the axial structural strength between the inner ring 62 and the outer ring 61.

[0036] The implementation principle of a screw transmission structure in the present embodiment is as follows: when the screw transmission mechanism is running, the motor 4 drives the screw 1 to rotate, and the screw 1 rotates through the supporting bearing 6 between the first bearing seat 2 and the second bearing seat 3. The screw nut 5 on the screw 1 reciprocates along the axial direction of the screw 1 under the action of the screw 1. During the operation of the screw transmission structure, the screw 1 is subjected to the axial force from the workpiece, and the screw 1 transmits the axial force to the supporting bearing 6. The mounting portion 63 in the supporting bearing 6 and the steps inside the outer ring 61 apply axial pressure to the steel column. The axial support of the supporting bearing 6 is achieved by the mounting portion 63 and the steps inside the outer ring 61, thereby avoiding the deflection or deformation of the ball 64 when the supporting bearing 6 is subjected to axial force, ensuring the transmission stability of the supporting bearing 6, improving the overall structural strength and transmission efficiency of the screw transmission structure, and extending the service life of the supporting bearing 6.

[0037] In summary, in the present application, multiple support bearings are arranged between the two ends of the lead screw and the first bearing seat and the second bearing seat, and the support bearings are symmetrically arranged along the radial direction of the lead screw. The support bearings improve the axial structural strength between the lead screw and the first bearing seat and the second bearing seat, avoiding the situation where the lead screw transmission structure causes the transmission efficiency to decrease after long-term use, thereby improving the transmission efficiency of the lead screw transmission structure and extending the service life. Therefore, the present application effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0038] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present application shall still be included in the protection scope of the present application.

Claims

1. A screw transmission structure, comprising a screw (1), wherein two ends of the screw (1) are respectively connected to a first bearing seat (2) and a second bearing seat (3), wherein: At least two supporting bearings (6) are arranged at the connection between the lead screw (1) and the first bearing seat (2) and the second bearing seat (3), and the supporting bearing (6) comprises an inner ring (62), a ball (64) and an outer ring (61). An outer edge of the inner ring (62) extends outwardly along the circumferential direction to form a mounting portion (63). The ball (64) is rotatably embedded in the side surface of the mounting portion (63) along the circumferential direction. The outer ring (61) is rotatably sleeved on the outside of the mounting portion (63). The mounting portion (63) axially supports the ball (64). The at least two supporting bearings (6) arranged at the same end of the lead screw (1) are symmetrically arranged along the radial direction of the lead screw (1).

2. A screw transmission structure according to claim 1, characterized in that: A precision nut (8) and a first locking nut (10) are respectively threadedly connected at both ends of the connection between the lead screw (1) and the first bearing seat (2); the precision nut (8) and the first locking nut (10) cooperate to press and fix the plurality of support bearings (6).

3. A screw transmission structure according to claim 2, characterized in that: A first spacer sleeve (7) and a second spacer sleeve (9) are arranged between the precision nut (8) and the first locking nut (10) and the support bearing (6).

4. A screw transmission structure according to claim 1, characterized in that: A first end cover (13) is provided at the connection between the lead screw (1) and the first bearing seat (2), and the first end cover (13) is fixedly connected to the first bearing seat (2).

5. A screw transmission structure according to claim 1, characterized in that: A second end cover (14) is provided at the connection between the lead screw (1) and the second bearing seat (3), the second end cover (14) is fixedly connected to the second bearing seat (3), and a second locking nut (16) for locking and fixing the second end cover (14) is provided at the end of the lead screw (1).

6. A screw transmission structure according to claim 5, characterized in that: A second spacer sleeve (9) is provided between the support bearing (6) and the second end cover (14).

7. A screw transmission structure according to claim 1, characterized in that: A dust cover (11) is provided at one end of the lead screw (1) connected to the first bearing seat (2).

8. A screw transmission structure according to claim 1, characterized in that: A lead screw nut (5) is threadedly connected to the lead screw (1), and a buffer pad (12) is provided between the first bearing seat (2), the second bearing seat (3) and the lead screw nut (5).

Images