High-precision linear driving module

Abstract

The utility model discloses a high-precision linear driving module, which comprises a base, a driving motor, a driving lead screw and a first lead screw nut, the driving motor is screwed and fastened at the rear end part of the base, the driving lead screw is arranged at the power output end of the driving motor, and the internal thread of the first lead screw nut is meshed with the external thread of the driving lead screw. The first lead screw nut is provided with a driving piece; the high-precision linear driving module further comprises a second lead screw nut, and an internal thread of the second lead screw nut is meshed with an external thread of the driving lead screw. The first lead screw nut is connected with the second lead screw nut in a rotation stopping mode, a compression spring arranged on the periphery of the driving lead screw in a sleeving mode is arranged between the first lead screw nut and the second lead screw nut, one end of the compression spring abuts against the first lead screw nut, and the other end of the compression spring abuts against the second lead screw nut. By means of the structural design, the linear driving mechanism has the advantages of being novel in structural design and high in linear driving precision.

Description

Technical Field

[0001] The utility model relates to the technical field of linear drive modules, and in particular designs a high-precision linear drive module. Background Art

[0002] As a power structure, linear drive modules are widely used in the process of driving the actuator movement; when working, the linear drive module drives the actuator to move linearly through its driving end.

[0003] Among them, the patent number is: ZL202321915915.6, and the patent name is: A Chinese utility model patent for a ball screw, which essentially discloses a linear drive module; specifically, the ball screw includes a base and a screw, and the two ends of the screw are rotatably arranged on the base; a driving motor is arranged on the base, and the driving motor is connected to and drives the screw to rotate, a threaded area is arranged in the middle of the screw, and blank polished rod areas are arranged at both ends; a screw nut is slidably arranged along the extension direction of the screw, and guide sleeves are fixed at both ends of the screw nut, and screw threads for threaded cooperation with the threaded area are arranged on the guide sleeve.

[0004] It should be pointed out that the above-mentioned ball screw has the following defects. Specifically, when the threaded area of ​​the screw nut and the screw are meshed and connected through internal and external threads, there is inevitably a meshing transmission gap (backlash) between the screw nut and the screw, and the meshing transmission gap will affect the accuracy of the linear movement of the screw nut driven by the rotating screw, that is, there is a problem of low linear drive accuracy. Utility Model Content

[0005] The utility model aims to provide a high-precision linear drive module to address the deficiencies of the prior art. The high-precision linear drive module has a novel structural design and high linear drive precision.

[0006] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical solutions.

[0007] A high-precision linear drive module comprises a base, a drive motor, a drive screw and a first screw nut, wherein the drive motor is screwed and fastened to the rear end of the base, the drive screw is arranged at the power output end of the drive motor, the internal thread of the first screw nut is meshed with the external thread of the drive screw, and the first screw nut is provided with a driving member;

[0008] The high-precision linear drive module also includes a second screw nut, the internal thread of the second screw nut is meshed with the external thread of the driving screw;

[0009] The first screw nut is non-rotatably connected to the second screw nut, and a compression spring sleeved on the outer periphery of the driving screw is installed between the first screw nut and the second screw nut, one end of the compression spring abuts against the first screw nut, and the other end of the compression spring abuts against the second screw nut.

[0010] The first screw nut is provided with a first cylindrical portion in a cylindrical shape, the second screw nut is provided with a second cylindrical portion in a cylindrical shape, and the compression spring is sleeved on the periphery of the first cylindrical portion and the second cylindrical portion;

[0011] The first cylindrical part is provided with a rotation-stopping protrusion, and the second cylindrical part is provided with a rotation-stopping groove. The rotation-stopping protrusion of the first cylindrical part is inserted into the rotation-stopping groove of the second cylindrical part.

[0012] The front end of the base is provided with a front support part, the rear end of the base is provided with a rear support part, the driving motor is screwed and fastened to the rear support part, and the front end of the driving screw is installed on the front support part through a bearing;

[0013] The first screw nut is provided with a guide hole which completely penetrates front and back, a guide rod is inserted into the guide hole, and the front end and the rear end of the guide rod are respectively connected to the front support part and the rear support part on the corresponding side.

[0014] Wherein, the driving member includes an upper driving member and a lower driving member, the upper driving member is threadedly fastened to the upper end of the first screw nut by a locking screw, and the lower driving member is threadedly fastened to the lower end of the first screw nut by a locking screw.

[0015] The upper end of the base is screwed with an upper cover, the upper cover is provided with an upper through slot which runs through the upper and lower parts and extends along the front-back direction, and the base is provided with a lower through slot which runs through the upper and lower parts and extends along the front-back direction;

[0016] The upper driving member passes through the upper through slot of the upper cover from bottom to top, and the lower driving member passes through the lower through slot of the base from top to bottom.

[0017] Compared with the prior art, the utility model has the following beneficial effects, specifically: for the compression spring installed between the first screw nut and the second screw nut, the elastic force of the compression spring makes the internal thread of the first screw nut and the internal thread of the second screw nut fit tightly with the external thread of the driving screw, that is, the meshing transmission clearance between the first screw nut and the driving screw and between the second screw nut and the driving screw can be effectively reduced; for the screw nut assembly structure composed of the first screw nut, the second screw nut and the compression spring, in the process of the screw nut assembly structure meshing with the driving screw thread and realizing the transmission connection, it can effectively reduce the backlash existing in the thread meshing transmission, thereby effectively improving the accuracy of the thread meshing transmission. Therefore, the high-precision linear drive module of the utility model has the advantages of novel structural design and high linear drive accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is an exploded schematic diagram of the utility model.

[0021] Figure 3 It is a partial cross-sectional schematic diagram of the utility model.

[0022] Figure 4 It is a partial cross-sectional schematic diagram of another position of the utility model.

[0023] Figure 5 It is a partial structural schematic diagram of the utility model.

[0024] exist Figures 1 to 5 Included are:

[0025] 1-base; 11-front support part; 12-rear support part; 13-lower through slot; 2-drive motor; 3-drive screw; 4-first screw nut; 41-first cylindrical part; 42-stop convex part; 43-guide hole; 5-second screw nut; 51-second cylindrical part; 52-stop groove; 6-compression spring; 7-bearing; 8-guide rod; 91-upper drive member; 92-lower drive member; 93-locking nut; 10-upper cover; 101-upper through slot. DETAILED DESCRIPTION

[0026] The present invention will be described below in conjunction with specific implementation methods.

[0027] Embodiment 1, as Figures 1 to 5As shown, a high-precision linear drive module includes a base 1, a drive motor 2, a drive screw 3, and a first screw nut 4. The drive motor 2 is screwed and fastened to the rear end of the base 1, and the drive screw 3 is arranged at the power output end of the drive motor 2. The internal thread of the first screw nut 4 is meshed with the external thread of the drive screw 3, and the first screw nut 4 is provided with a driving member.

[0028] It should be explained that, for the driving screw 3 of the first embodiment, it can be an integral structure with the rotor part of the driving motor 2, or it can be connected to the rotor part of the driving motor 2 through a coupling.

[0029] The high-precision linear drive module further includes a second lead screw nut 5 , the internal thread of the second lead screw nut 5 is meshed with the external thread of the drive lead screw 3 .

[0030] In addition, the first screw nut 4 is non-rotatably connected to the second screw nut 5, and a compression spring 6 is installed between the first screw nut 4 and the second screw nut 5 and is sleeved on the outer periphery of the driving screw 3. One end of the compression spring 6 abuts against the first screw nut 4, and the other end of the compression spring 6 abuts against the second screw nut 5.

[0031] It should be pointed out that the first screw nut 4 and the second screw nut 5 are respectively connected to the driving screw 3 by threaded engagement. When the driving motor 2 is started and the driving screw 3 is rotated, the first screw nut 4 and the second screw nut 5 move synchronously under the driving action of the driving screw 3.

[0032] For the compression spring 6 installed between the first screw nut 4 and the second screw nut 5, the elastic force of the compression spring 6 makes the internal thread of the first screw nut 4 and the internal thread of the second screw nut 5 fit tightly with the external thread of the driving screw 3, respectively, which can effectively reduce the meshing transmission clearance between the first screw nut 4 and the driving screw 3 and between the second screw nut 5 and the driving screw 3; therefore, for the above-mentioned screw nut assembly structure composed of the first screw nut 4, the second screw nut 5 and the compression spring 6, in the process of the screw nut assembly structure being threadedly engaged with the driving screw 3 and realizing the transmission connection, it can effectively reduce the backlash existing in the threaded engagement transmission, thereby effectively improving the accuracy of the threaded engagement transmission.

[0033] In summary, it can be seen that through the above structural design, the high-precision linear drive module of the first embodiment has the advantages of novel structural design and high linear drive precision.

[0034] Embodiment 2, as Figure 2 , Figure 3 as well as Figure 5As shown, the difference between the second embodiment and the first embodiment is that the first screw nut 4 is provided with a first cylindrical portion 41 in a cylindrical shape, the second screw nut 5 is provided with a second cylindrical portion 51 in a cylindrical shape, and the compression spring 6 is sleeved on the periphery of the first cylindrical portion 41 and the second cylindrical portion 51.

[0035] The first cylindrical portion 41 is provided with a rotation-stopping protrusion 42 , and the second cylindrical portion 51 is provided with a rotation-stopping groove 52 . The rotation-stopping protrusion 42 of the first cylindrical portion 41 is inserted into the rotation-stopping groove 52 of the second cylindrical portion 51 .

[0036] When the compression spring 6 is installed between the first screw nut 4 and the second screw nut 5, one end of the compression spring 6 is inserted into the outer periphery of the first cylindrical portion 41 of the first screw nut 4, and the other end of the compression spring 6 is inserted into the outer periphery of the second cylindrical portion 51 of the second screw nut 5. The first screw nut 4 positions the compression spring 6 through the first cylindrical portion 41, and the second screw nut 5 positions the compression spring 6 through the second cylindrical portion 51, so as to improve the convenience when installing the compression spring 6.

[0037] In addition, the first cylindrical portion 41 and the second cylindrical portion 51 separate the compression spring 6 from the driving screw 3, which can effectively prevent the rotating driving screw 3 from affecting the compression spring 6, thereby improving the overall stability and reliability.

[0038] In addition, by cooperating with the anti-rotation protrusion 42 and the anti-rotation groove 52, the second embodiment can realize a quick anti-rotation connection between the first screw nut 4 and the second screw nut 5.

[0039] Embodiment three, as Figure 1 and Figure 2 As shown, the difference between the third embodiment and the first embodiment is that a front support portion 11 is provided at the front end of the base 1, a rear support portion 12 is provided at the rear end of the base 1, the driving motor 2 is screwed and fastened to the rear support portion 12, and the front end of the driving screw 3 is installed on the front support portion 11 through a bearing 7.

[0040] In addition, if Figure 2 , Figure 3 as well as Figure 5 As shown, the first screw nut 4 is provided with a guide hole 43 which completely penetrates from front to back, and a guide rod 8 is inserted into the guide hole 43. The front end and the rear end of the guide rod 8 are respectively connected to the front support part 11 and the rear support part 12 on the corresponding side.

[0041] By matching the guide rod 8 with the guide hole 43 of the first screw nut 4 , the third embodiment can ensure that the first screw nut 4 can move linearly accurately and smoothly.

[0042] Embodiment 4, as Figures 1 to 5As shown, the difference between the fourth embodiment and the first embodiment is that the driving member includes an upper driving member 91 and a lower driving member 92, the upper driving member 91 is screwed and fastened to the upper end of the first screw nut 4 by a locking screw, and the lower driving member 92 is screwed and fastened to the lower end of the first screw nut 4 by a locking screw.

[0043] During use of the high-precision linear drive module of the fourth embodiment, the upper drive member 91 can independently drive an execution load, and the lower drive member 92 can also independently drive an execution load, that is, the fourth embodiment can simultaneously realize the synchronous drive of two execution loads.

[0044] Embodiment 5, as Figures 1 to 4 As shown, the difference between the fifth embodiment and the fourth embodiment is that an upper cover 10 is screwed and fastened to the upper end of the base 1, and the upper cover 10 is provided with an upper through groove 101 which passes through the upper and lower parts and extends along the front-to-back direction, and the base 1 is provided with a lower through groove 13 which passes through the upper and lower parts and extends along the front-to-back direction.

[0045] The upper driving member 91 passes through the upper through slot 101 of the upper cover 10 from bottom to top, and the lower driving member 92 passes through the lower through slot 13 of the base 1 from top to bottom.

[0046] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A high-precision linear drive module, comprising a base (1), a drive motor (2), a drive screw (3), and a first screw nut (4), wherein the drive motor (2) is screwed and fastened to the rear end of the base (1), the drive screw (3) is arranged at the power output end of the drive motor (2), the internal thread of the first screw nut (4) is meshed with the external thread of the drive screw (3), and the first screw nut (4) is provided with a driving member; Features: The high-precision linear drive module also includes a second screw nut (5), the internal thread of the second screw nut (5) being meshed with the external thread of the drive screw (3); The first screw nut (4) is connected to the second screw nut (5) in a rotationally fixed manner, and a compression spring (6) sleeved on the outer periphery of the driving screw (3) is arranged between the first screw nut (4) and the second screw nut (5), one end of the compression spring (6) abuts against the first screw nut (4), and the other end of the compression spring (6) abuts against the second screw nut (5).

2. A high-precision linear drive module according to claim 1, characterized in that: The first screw nut (4) is provided with a first cylindrical portion (41) in a cylindrical shape, the second screw nut (5) is provided with a second cylindrical portion (51) in a cylindrical shape, and the compression spring (6) is sleeved on the peripheries of the first cylindrical portion (41) and the second cylindrical portion (51); The first cylindrical portion (41) is provided with a rotation-stopping protrusion (42), and the second cylindrical portion (51) is provided with a rotation-stopping groove (52). The rotation-stopping protrusion (42) of the first cylindrical portion (41) is inserted into the rotation-stopping groove (52) of the second cylindrical portion (51).

3. A high-precision linear drive module according to claim 1, characterized in that: The front end of the base (1) is provided with a front support portion (11), the rear end of the base (1) is provided with a rear support portion (12), the drive motor (2) is screwed and fastened to the rear support portion (12), and the front end of the drive screw rod (3) is mounted on the front support portion (11) via a bearing (7); The first screw nut (4) is provided with a guide hole (43) which completely penetrates from front to back, a guide rod (8) is inserted into the guide hole (43), and the front end and rear end of the guide rod (8) are respectively connected to the front support part (11) and the rear support part (12) on the corresponding side.

4. The high-precision linear drive module according to claim 1, characterized in that: The driving member comprises an upper driving member (91) and a lower driving member (92); the upper driving member (91) is screwed and fastened to the upper end of the first screw nut (4) by means of a locking screw, and the lower driving member (92) is screwed and fastened to the lower end of the first screw nut (4) by means of a locking screw.

5. A high-precision linear drive module according to claim 4, characterized in that: An upper cover (10) is screwed and fastened to the upper end of the base (1), the upper cover (10) is provided with an upper through slot (101) penetrating vertically and extending in the front-to-back direction, and the base (1) is provided with a lower through slot (13) penetrating vertically and extending in the front-to-back direction; The upper driving member (91) passes through the upper through slot (101) of the upper cover (10) from bottom to top, and the lower driving member (92) passes through the lower through slot (13) of the base (1) from top to bottom.

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