High-rigidity lead screw motor module

Abstract

The utility model discloses a kind of high rigidity screw motor module, including screw rod, bearing seat, locking nut, tight screw, motor and bearing, the screw rod axial end is equipped with blind hole and is equipped with first through-hole for the tight screw to pass in radially, the rotating shaft of the motor passes into the blind hole;The bearing seat inside is equipped with the boss matched with bearing;The locking nut is connected with screw rod thread;The tight screw passes through locking nut radially.Compared with prior art, the utility model passes through detachable structure of screw connection, avoids the maintenance problem caused by welding or glue bonding, reduces cost and maintenance difficulty, improves equipment operation and maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to lead screw motors, and more particularly to a high-rigidity lead screw motor module. Background Technology

[0002] In the field of automation, lead screw motors are commonly used components for achieving linear motion and are widely applied due to their high degree of integration. Lead screw motors typically integrate the lead screw, nut, bearing support structure, and drive motor into a single unit, realizing the conversion from rotary motion to linear motion. However, existing lead screw motors generally suffer from problems such as low axial thrust, low precision, and difficult maintenance. While some technologies have improved axial thrust, they have led to even more difficult maintenance and increased costs.

[0003] A search revealed Chinese Patent Publication No. CN203788077U, which discloses a novel bearing support structure for a linear stepper motor. This structure employs two angular contact bearings, secured by an outer ring anti-loosening nut, an outer ring locking nut, and an inner ring preload nut, with adhesive applied to prevent loosening. However, this solution has the following drawbacks: Firstly, the lead screw and motor are an integrated structure, with core components often welded or glued together. While the adhesive can be disassembled by high-temperature heating, the adhesive application point penetrates deep into the motor and is close to the bearing. Furthermore, the adhesive heating temperature often exceeds the bearing's maximum allowable operating temperature, making heating difficult and increasing the complexity of assembly and disassembly, thus hindering maintenance. Secondly, lead screw motors typically bear axial forces. To ensure rigidity, this solution uses angular contact bearings as the only viable option, but the high cost of angular contact bearings results in poor economic efficiency.

[0004] Therefore, the technical problem that needs to be solved is how to reduce maintenance difficulty and cost while ensuring sufficient axial thrust and accuracy, and how to provide an adaptable solution that meets the needs of different scenarios. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the existing technology and provide a high-rigidity ball screw motor module.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] According to one aspect of the present invention, a high-rigidity lead screw motor module is provided, comprising a lead screw, a bearing housing, a locking nut, a set screw, a motor, and a bearing. The lead screw has a blind hole at its axial end and a first through hole in the radial direction for the set screw to pass through. The motor shaft passes through the blind hole. The bearing housing has a boss inside that mates with the bearing. The locking nut is threaded to the lead screw. The set screw passes radially through the locking nut.

[0008] As a preferred technical solution, the bearing is provided in two parts, both of which are thrust bearings, and the two thrust bearings are respectively attached to the two end faces of the boss.

[0009] As a preferred technical solution, the bearing is provided in two parts, both of which are deep groove ball bearings, and the two deep groove ball bearings are respectively attached to the two end faces of the boss.

[0010] As a preferred technical solution, the bearing is provided in two parts, both of which are angular contact bearings. One side of the two angular contact bearings is close to the boss, and the other side is fixed to the bearing seat by circumferentially distributed screws.

[0011] As a preferred technical solution, the set screw includes a long set screw and a short set screw.

[0012] As a preferred technical solution, the long set screw passes through the first through hole of the locking nut and the lead screw to fix the motor shaft and the lead screw.

[0013] As a preferred technical solution, the short set screw is locked into the lock nut to restrict the rotation of the lock nut.

[0014] As a preferred technical solution, the locking nut is provided with four radial threaded holes for installing the set screw, wherein three threaded holes are used to install short set screws and one threaded hole is used to install long set screws.

[0015] As a preferred technical solution, the lead screw motor module further includes a positioning block, which is connected to the bearing seat through threads and a positioning circle; the positioning block is provided with a third through hole for the lead screw to pass through.

[0016] As a preferred technical solution, the bearing housing is provided with a second through hole, the position of which corresponds to the set screw.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This utility model avoids welding or glue bonding by using threaded connection and self-locking structure, which facilitates the assembly and disassembly of parts and improves maintenance convenience.

[0019] 2. This utility model provides three optional configurations: thrust bearing, deep groove ball bearing, and angular contact bearing. It can be flexibly adapted to different application scenarios according to different thrust requirements, cost budgets, and maintenance convenience requirements, thus covering a wider range and being more practical.

[0020] 3. This utility model uses a bearing seat boss to position double bearings and a lead screw to rigidly connect with the motor shaft. It also breaks through the limitation of motor size on lead screw and bearings, improving overall rigidity while allowing for the flexible selection of larger components to obtain greater thrust. Attached Figure Description

[0021] Figure 1 This is an isometric drawing of the lead screw motor of this utility model;

[0022] Figure 2 This is a cross-sectional view of the first embodiment of the lead screw motor of this utility model;

[0023] Figure 3 This is a cross-sectional view of the locking nut for the lead screw motor of this utility model;

[0024] Figure 4 This is a cross-sectional view of the second embodiment of the lead screw motor of this utility model;

[0025] Figure 5 This is a cross-sectional view of the third embodiment of the lead screw motor of this utility model. Figure 1 ;

[0026] Figure 6 This is a cross-sectional view of the third embodiment of the lead screw motor of this utility model. Figure 2 ;

[0027] Figure 2 As indicated by the index number:

[0028] 1 is the lead screw, 2 is the nut, 3 is the bearing housing, 31 is the boss, 4 is the lock nut, 5 is the long set screw, 6 is the short set screw, 7 is the motor, 8 is the thrust bearing, and 9 is the positioning block.

[0029] Figure 4 As indicated by the index number:

[0030] 10 is a deep groove ball bearing;

[0031] Figure 5 As indicated by the index number:

[0032] 11 is an angular contact bearing, and 12 is a screw.

[0033] Figure 5 As indicated by the index number:

[0034] 12 represents a screw. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0036] Example 1:

[0037] like Figures 1-3As shown, the high rigidity module of this utility model includes a lead screw 1, a nut 2, a bearing seat 3, a locking nut 4, a long set screw 5, a short set screw 6, a motor 7, a thrust bearing 8, and a positioning block 9.

[0038] The lead screw 1 has a blind hole at its end for axial insertion into the motor 7 shaft, and a first through hole in the radial direction for the long set screw 5 to pass through. The nut 2 is fitted onto the lead screw 1 to convert the motor 7 torque into a push-pull force. The bearing housing 3 has a boss 31 inside, and the thrust bearing 8 cooperates with the boss 31. The bearing housing 3 has a second through hole through which a hex wrench can lock the long set screw 5 and the short set screw 6. The locking nut 4 is threaded to the lead screw 1 and has one long set screw 5 and three short set screws 6 in the radial direction. The long set screw 5 passes through the threaded hole of the locking nut 4 and the first through hole in the radial direction of the lead screw 1, and its end presses against the motor 7 shaft to restrict the relative rotation of the two. The positioning block 9 is connected to the bearing housing 3 by threads and a positioning circle. The positioning block 9 has a third through hole for easy assembly and disassembly.

[0039] The thrust bearing used in this embodiment is a rolling bearing specifically designed to withstand axial loads. Its structural features include raceways and rolling elements capable of withstanding large axial forces, and contact surfaces that are either flat or inclined. This allows for efficient transmission of axial forces to the bearing housing, resulting in high axial load capacity and high rigidity. When the lead screw motor is subjected to axial push-pull forces, these forces are sequentially transmitted through nut 2, lead screw 1, thrust bearing 8, and bearing housing 3, achieving force balance with the external structural components. When motor 7 generates torque, bearing housing 3, motor 7, long set screw 5, lead screw 1, and nut 2 achieve torque balance with the external structural components. Lead screw 1 and nut 2 convert the torque of motor 7 into push-pull forces.

[0040] The motor 7 can be separated by loosening the screws securing it and the long set screw 5. This invention, with its threaded, detachable structure, avoids the maintenance difficulties associated with welding or adhesive bonding, reducing costs and maintenance complexity, and improving equipment operation and maintenance efficiency.

[0041] The use of thrust bearing 8 significantly improves axial thrust while ensuring high rigidity. Moreover, the cost of thrust bearing is lower than that of angular contact bearing. Combined with the detachable design of threaded connection, it achieves a balance between high thrust, low cost and convenient maintenance, making it suitable for scenarios with high requirements for axial load capacity.

[0042] Example 2:

[0043] like Figure 4 As shown, this is the second embodiment provided by the present invention, which uses two sets of deep groove ball bearings 10.

[0044] The deep groove ball bearing used in this embodiment is one of the most common rolling bearings. It has a simple structure, consisting of an inner ring, outer ring, rolling elements, and a cage. The raceway is deep groove-shaped. Deep groove ball bearings are mainly used to bear radial loads, but can also bear certain bidirectional axial loads. They are characterized by low frictional resistance, high speed, high precision, and low manufacturing cost. When the speed is high and thrust ball bearings are not suitable, they can also be used to bear pure axial loads. Compared with other types of bearings of the same specifications and dimensions, this type of bearing has a low coefficient of friction and a high limiting speed, but it is not impact-resistant and is not suitable for heavy loads. In this embodiment, two sets of deep groove ball bearings 10 are tightly fitted to the two end faces of the boss 31, and axial positioning is achieved through the limiting of the bearing housing 3. This provides stable support for the rotation of the lead screw 1 and ensures the accuracy of linear motion, making it suitable for scenarios with high precision requirements but low axial thrust requirements.

[0045] Example 3:

[0046] like Figure 5 , Figure 6 As shown, this is the fourth embodiment provided by the present invention, which uses two sets of angular contact bearings 11.

[0047] The angular contact bearing used in this embodiment can simultaneously withstand radial and axial loads. Its contact angle determines the axial load capacity; the larger the contact angle, the higher the axial load capacity. Angular contact bearings are usually installed in pairs, and the rigidity of the system is improved by preload. They have the structural feature that the inner and outer raceways have a certain axial offset, allowing them to withstand both radial loads and large unidirectional axial loads. Furthermore, the axial force capacity can be changed by adjusting the contact angle. The two sets of angular contact bearings 11 are arranged face-to-face or back-to-back according to the actual force direction. One side is positioned against the boss 31, while the other end face is pressed and fixed to the end cover of the bearing housing 3 by four screws 12 evenly distributed along the circumference, thus forming a high-rigidity bearing assembly capable of withstanding bidirectional axial loads and torques. This is suitable for scenarios requiring high ease of maintenance.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A high-rigidity lead screw motor module, comprising a lead screw (1), a bearing housing (3), a locking nut (4), a set screw, a motor (7), and a bearing, characterized in that, The lead screw (1) has a blind hole at its axial end and a first through hole in the radial direction for the set screw to pass through. The shaft of the motor (7) passes through the blind hole. The bearing seat (3) has a boss (31) inside that cooperates with the bearing. The locking nut (4) is threaded to the lead screw (1). The set screw passes through the locking nut (4) in the radial direction.

2. The high-rigidity ball screw motor module according to claim 1, characterized in that, The bearing is provided in two parts, both of which are thrust bearings (8), and the two thrust bearings (8) are respectively attached to the two end faces of the boss (31).

3. The high-rigidity ball screw motor module according to claim 1, characterized in that, The bearing is provided in two parts, both of which are deep groove ball bearings (10), and the two deep groove ball bearings (10) are respectively attached to the two end faces of the boss (31).

4. The high-rigidity ball screw motor module according to claim 1, characterized in that, The bearing is provided in two parts, both of which are angular contact bearings (11). One side of each of the two angular contact bearings (11) is attached to the boss (31), and the other side is fixed to the bearing seat (3) by circumferentially distributed screws (12).

5. The high-rigidity ball screw motor module according to claim 1, characterized in that, The set screws include long set screws (5) and short set screws (6).

6. The high-rigidity ball screw motor module according to claim 5, characterized in that, The long set screw (5) passes through the first through hole of the locking nut (4) and the lead screw (1) to fix the shaft of the motor (7) to the lead screw (1).

7. The high-rigidity lead screw motor module according to claim 5, characterized in that, The short set screw (6) is locked into the lock nut (4) to restrict the rotation of the lock nut (4).

8. The high-rigidity ball screw motor module according to claim 5, characterized in that, The locking nut (4) has four radial threaded holes for installing the set screws, three of which are for installing short set screws (6) and one of which is for installing long set screws (5).

9. The high-rigidity ball screw motor module according to claim 1, characterized in that, The lead screw motor module also includes a positioning block (9), which is connected to the bearing seat (3) by a thread and a positioning circle; the positioning block (9) is provided with a third through hole for the lead screw (1) to pass through.

10. The high-rigidity ball screw motor module according to claim 1, characterized in that, The bearing housing (3) is provided with a second through hole, the position of which corresponds to the set screw.

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