Linear driver

Abstract

The utility model relates to a linear driver which comprises a shell assembly, a motor, a transmission assembly and a driving assembly, an inner cavity is formed in the shell assembly, the motor, the transmission assembly and the driving assembly are arranged in the shell assembly, and the driving assembly is connected with the motor through the transmission assembly and arranged below the motor. The driving assembly comprises a lead screw, a sliding sleeve connected to the lead screw in a threaded mode and a push rod arranged on the outer side of the lead screw in a sleeving mode and fixedly connected with the sliding sleeve, and a penetrating hole allowing the push rod to penetrate out of the shell assembly is formed in one side of the shell assembly. According to the linear driver, the motor and the driving assembly are integrated in the shell assembly in an up-and-down mode, rotary motion is converted into linear motion through the transmission assembly, the occupied space area is greatly reduced, meanwhile, the manufacturing size of the linear driver is reduced, and adaptability is improved. The motor drives the lead screw to rotate so as to drive the push rod to move forwards and backwards, and the lead screw has a self-locking function, so that the precision and stability of the system are improved.

Description

Technical Field

[0001] The utility model relates to the field of drivers, in particular to a linear driver. Background Art

[0002] In the rapid development of modern industrial automation and intelligence, as well as future industrial humanoid robots, the driver, as one of the core components, has high requirements for its control performance and structural miniaturization. Therefore, it is of great significance to improve the control accuracy and stability of the driver, and to miniaturize its structure and prolong its service life.

[0003] Traditional drives have short service life, low safety, large size, and low efficiency. They have certain limitations in limited space and require high-efficiency torque output, and cannot meet the growing application needs of the rapid development of future industries. Utility Model Content

[0004] In view of this, the present invention aims to provide a linear actuator to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] The utility model provides a linear actuator, comprising a housing assembly with an inner cavity formed therein, a motor, a transmission assembly and a drive assembly arranged inside the housing assembly, wherein the drive assembly is connected to the motor through the transmission assembly and is arranged below the motor;

[0007] The driving assembly includes a lead screw, a sliding sleeve threadedly connected to the lead screw, and a push rod sleeved outside the lead screw and fixedly connected to the sliding sleeve. A through hole is provided on one side of the housing assembly for the push rod to pass through the housing assembly.

[0008] Furthermore, the housing assembly includes a front housing, a middle housing and a rear housing, the front housing and the rear housing are respectively fixedly connected to the two open ends of the middle housing, and the through-holes are provided on the rear housing.

[0009] Furthermore, the motor and the transmission assembly are connected via a reducer, and the motor power is transmitted to the transmission assembly via the reducer, driving the transmission assembly to rotate the lead screw.

[0010] Furthermore, the transmission assembly includes a first gear fixedly connected to the end of the reducer on one side, and a second gear fixedly connected to the end of the screw on one side. The first gear and the second gear are meshed, and the other sides are respectively rotatably connected to the inner side wall of the housing assembly.

[0011] Furthermore, a bearing is provided at one end of the lead screw away from the push rod, and an outer side wall of the bearing is fixedly connected to the inner side of the housing assembly.

[0012] Furthermore, a guide sleeve is provided in the through hole, and the guide sleeve follows the inner contour of the through hole and is slidably connected to the push rod.

[0013] Furthermore, a gap for installing a main control module is opened at the top of the inner cavity of the housing assembly, and the motor is electrically connected to the main control module.

[0014] Furthermore, an adjustment device is provided in the housing assembly, the adjustment device comprising a conductive sheet connected to the sliding sleeve via a connecting assembly, a mounting seat fixedly provided on the inner side wall of the housing assembly, and a resistor sheet fixedly provided on the mounting seat and extending in the length direction of the mounting seat;

[0015] The mounting seat is arranged on a side opposite to the conductive sheet and extends along the length direction of the lead screw, and the conductive sheet abuts against the resistor sheet;

[0016] Two carbon film coatings for conducting electricity are symmetrically provided on one side of the resistor sheet that contacts the conductive sheet, and the two carbon film coatings are electrically connected to the main control module respectively.

[0017] Furthermore, the connecting assembly includes a fixing seat fixedly connected to the sliding sleeve, a cross-shaped fixing groove provided on the fixing seat, and a mounting portion fixedly arranged at the center of the fixing groove;

[0018] The conductive sheet is a special-shaped piece. During installation, one side of the conductive sheet enters the fixing groove and abuts against the inner wall of the installation groove, and is plug-connected with the installation part. The end of the other side of the conductive sheet abuts against the resistor sheet.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] In this utility model, the motor and drive assembly are integrated vertically within the housing assembly. The transmission assembly converts rotary motion into linear motion, significantly reducing the footprint and bulk of the linear actuator, thereby increasing adaptability. The motor drives the lead screw, which in turn drives the push rod forward and backward. The self-locking feature of the lead screw enhances the system's precision and stability.

[0021] The installation method of the housing assembly composed of the front housing, the middle housing and the outer housing is conducive to the installation and removal of the internal accessories of the linear drive and facilitates the overall assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0025] Figure 3 This is a schematic structural diagram of the regulating device of the present utility model;

[0026] Figure 4 This is a schematic diagram of the carbon film coating and conductive sheet structure of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the fixing seat and the conductive sheet of the utility model;

[0028] Figure 6 This is a schematic diagram of the screw structure of the utility model.

[0029] Description of reference numerals:

[0030] 1. Housing assembly; 101. Middle housing; 1011. Gap; 102. Front housing; 103. Rear housing; 1031. Perforation; 2. Motor; 201. Reducer; 3. Transmission assembly; 301. First gear; 302. Second gear; 4. Bearing; 5. Lead screw; 6. Sliding sleeve; 601. Fixed seat; 6011. Fixed slot; 6012. Mounting part; 6013. Conductive sheet; 7. Push rod; 8. Guide sleeve; 9. Mounting seat; 10. Resistor; 1001. Carbon film coating; 11. Main control module. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0032] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "back" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0034] The following will refer to the attached Figures 1 to 6 The present invention is described in detail with reference to the embodiments.

[0035] In general, the present invention relates to a linear actuator comprising a housing assembly 1 defining an internal cavity, a motor 2 disposed within the housing assembly 1, a transmission assembly 3, and a drive assembly. The drive assembly is connected to the motor 2 via the transmission assembly 3 and disposed below the motor 2. The drive assembly comprises a lead screw 5, a sliding sleeve 6 threadedly connected to the lead screw 5, and a push rod 7 sleeved around the outside of the lead screw 5 and fixedly connected to the sliding sleeve 6. A through-hole 1031 is provided on one side of the housing assembly 1 for the push rod 7 to pass through the housing assembly 1.

[0036] In this embodiment, the motor 2 and drive assembly are integrated vertically within the housing assembly 1. Transmission assembly 3 converts rotational motion into linear motion, significantly reducing the footprint and bulk of the linear actuator, thereby increasing adaptability. The motor 2 drives the lead screw 5, which in turn drives the push rod 7 forward and backward. The self-locking feature of the lead screw 5 enhances the system's precision and stability.

[0037] The specific implementation process is as follows: the motor 2 rotates, transmitting power to the lead screw 5 through the transmission assembly 3, driving the lead screw 5 to rotate. Since the sliding sleeve 6 is threadedly connected to the lead screw 5, the push rod 7 connected to the sliding sleeve 6 slides in the through-hole 1031. Therefore, when the lead screw 5 rotates, the sliding sleeve 6 is driven to move on the lead screw 5, thereby driving the push rod 7 to extend out of the through-hole 1031. The push rod 7 of the motor 2 then extends back into the through-hole 1031. It should be understood that the push rod 7 is connected to the device for driving at one end of the housing assembly 1.

[0038] It should be noted that the motor 2 is preferably a brushless hollow cup motor 2. The brushless hollow cup motor 2 improves the response speed, reduces noise and electromagnetic interference, and significantly increases the service life of the motor 2. The lead screw 5 and the sliding sleeve 6 are preferably a planetary lead screw, which has the characteristics of strong load-bearing capacity and small size. Compared with traditional lead screws, it has low friction and low noise, and can also increase the service life of the linear drive.

[0039] like Figure 1As shown, to facilitate installation and removal of the linear actuator's internal components and overall assembly, in this embodiment, the housing assembly 1 includes a front housing 102, a middle housing 101, and a rear housing 103. The front housing 102 and rear housing 103 are fixedly connected to the open ends of the middle housing 101, respectively. Through holes 1031 are provided in the rear housing 103. In specific implementations, the housing assembly 1 is preferably made of an insulating material to enhance overall safety.

[0040] As a preferred Figure 2 and Figure 6 As shown, a bearing 4 is provided at one end of the lead screw 5 away from the push rod 7, and the outer wall of the bearing 4 is fixedly connected to the inner side of the housing assembly 1. The bearing 4 can support the lead screw 5 in the housing assembly 1, fix the lead screw 5 in the housing assembly 1, and make it rotate more smoothly.

[0041] like Figure 2 As shown, since the push rod 7 is located deep inside the through hole 1031, in this embodiment, a guide sleeve 8 is further provided in the through hole 1031. The guide sleeve 8 follows the inner contour of the through hole 1031 and is slidably connected to the push rod 7. The guide sleeve 8 can protect the through hole 1031, preventing the push rod 7 from rubbing against the housing assembly 1 and causing wear, and also serves as a guide for the push rod 7.

[0042] Based on the above configuration, in order to effectively convert the high speed of the motor 2 into a large torque output, the motor 2 and the transmission assembly 3 are connected via a reducer 201. The power of the motor 2 is transmitted to the transmission assembly 3 via the reducer 201, driving the transmission assembly 3 to drive the screw 5 to rotate.

[0043] In specific implementation, the reducer 201 is preferably a planetary reducer 201, which has a compact structure, small size, and occupies little space, is easy to install and maintain, and further reduces the manufacturing volume of the driver.

[0044] Continue as Figure 2 As shown, the transmission assembly 3 includes a first gear 301 fixedly connected to the end of the reducer 201 on one side, and a second gear 302 fixedly connected to the end of the screw 5 on one side. The first gear 301 and the second gear 302 are engaged, and the other sides are respectively rotatably connected to the inner wall of the housing assembly 1.

[0045] In this embodiment, the first gear 301 and the second gear 302 are arranged up and down to transmit the power of the motor 2 to the screw 5. Of course, other power transmission methods such as belt transmission, chain transmission, etc. can also be selected. No further limitation is made here, and the optimal method is selected according to actual conditions.

[0046] In this embodiment, if Figure 2 and Figure 3As shown, the forward and reverse rotation of the motor 2 can cause the push rod 7 to extend and shorten. To facilitate the control of the motor 2, a gap 1011 is provided at the top of the inner cavity of the housing assembly 1 for mounting a main control module 11. The motor 2 is electrically connected to the main control module 11. It should be noted that the main control module 11 is an integrated circuit board that can control the speed and forward and reverse rotation of the motor 2, and can also detect resistance while supplying power.

[0047] Based on the above configuration of the main control module 11, in this embodiment, Figures 3 to 5 As shown, the housing assembly 1 is also provided with an adjustment device. This adjustment device, in conjunction with the main control module 11, precisely controls the rotation of the motor 2, thereby accurately adjusting the extended length of the push rod 7 to accommodate various operating requirements. The adjustment device includes a conductive sheet 6013 connected to the sliding sleeve 6 via a connecting assembly, a mounting base 9 fixedly mounted on the inner sidewall of the housing assembly 1, and a resistor sheet 10 fixedly mounted on the mounting base 9 and extending along the length of the mounting base 9.

[0048] like Figure 5 As shown, the mounting base 9 is positioned on the side opposite the conductive sheet 6013 and extends along the length of the lead screw 5. After installation, the conductive sheet 6013 abuts the resistor sheet 10. Furthermore, two conductive carbon coatings 1001 are symmetrically positioned on the side of the resistor sheet 10 that contacts the conductive sheet 6013. These two carbon coatings 1001 are electrically connected to the resistance detection terminals of the main control module 11. The conductive sheet 6013 connects the two carbon coatings 1001 on the resistor sheet 10, forming a circuit with the conductive sheet 6013, the carbon coatings 1001, and the main control module 11. In practice, the carbon coatings 1001 extend along the length of the resistor sheet 10.

[0049] During specific implementation, since the conductive sheet 6013 is installed on the sliding sleeve 6, when the screw 5 rotates, the sliding sleeve 6 will drive the conductive sheet 6013 to slide on the resistor sheet 10, changing the contact position with the two carbon film coatings 1001, causing the resistance value to change. The main control circuit determines the extension distance of the push rod 7 based on the resistance value, controls the number of rotations and the rotation speed of the motor 2, and realizes precise control of the push rod 7 to adapt to different working requirements.

[0050] It should be further explained that the conductive sheet 6013 is preferably made of beryllium copper, the mounting base 9 fixes the resistor 10, and the resistor 10 is preferably made of FR-4 substrate. The carbon film coating 1001 needs to be treated for wear when sprayed on the resistor 10.

[0051] like Figure 5As shown, the connecting assembly is used to connect the conductive sheet 6013 and the sliding sleeve 6, and includes a fixing base 601 fixedly connected to the sliding sleeve 6, a cross-shaped fixing groove 6011 formed in the fixing base 601, and a mounting portion 6012 fixedly disposed at the center of the fixing groove 6011. In addition, the conductive sheet 6013 is a special-shaped piece, which is U-shaped and has a pointed tip on one side. During installation, one side of the conductive sheet 6013 enters the fixing groove 6011 and abuts against the inner side wall of the mounting groove. It is then plugged into and connected to the mounting portion 6012, and the other end of the conductive sheet 6013 abuts against the resistor sheet 10.

[0052] This structure facilitates the removal of the conductive sheet 6013 from the fixing base 601. In addition, since the end of the conductive sheet 6013 abuts against the resistor sheet 10, the U-shaped conductive sheet 6013 has a certain deformation buffer to prevent it from falling off.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A linear actuator, characterized in that: It comprises a housing assembly (1) with an inner cavity formed therein, a motor (2) arranged inside the housing assembly (1), a transmission assembly (3), and a drive assembly, wherein the drive assembly is connected to the motor (2) via the transmission assembly (3) and is arranged below the motor (2); The driving assembly comprises a lead screw (5), a sliding sleeve (6) threadedly connected to the lead screw (5), and a push rod (7) sleeved on the outside of the lead screw (5) and fixedly connected to the sliding sleeve (6); a through hole (1031) for the push rod (7) to pass through the housing assembly (1) is provided on one side of the housing assembly (1).

2. A linear actuator according to claim 1, characterized in that: The housing assembly (1) comprises a front housing (102), a middle housing (101) and a rear housing (103); the front housing (102) and the rear housing (103) are respectively fixedly connected to the two open ends of the middle housing (101); and the through hole (1031) is provided on the rear housing (103).

3. The linear actuator according to claim 1, wherein: The motor (2) and the transmission assembly (3) are connected via a reducer (201), and the power of the motor (2) is transmitted to the transmission assembly (3) via the reducer (201), driving the transmission assembly (3) to drive the lead screw (5) to rotate.

4. A linear actuator according to claim 3, characterized in that: The transmission assembly (3) comprises a first gear (301) fixedly connected to the end of the reducer (201) on one side, and a second gear (302) fixedly connected to the end of the lead screw (5) on one side, the first gear (301) and the second gear (302) being meshed, and the other sides being rotatably connected to the inner side wall of the housing assembly (1).

5. The linear actuator according to claim 4, characterized in that: A bearing (4) is provided at one end of the lead screw (5) away from the push rod (7), and the outer side wall of the bearing (4) is fixedly connected to the inner side of the housing assembly (1).

6. The linear actuator according to claim 1, characterized in that: A guide sleeve (8) is further provided in the through hole (1031), and the guide sleeve (8) follows the inner contour of the through hole (1031) and is slidably connected to the push rod (7).

7. The linear actuator according to claim 1, characterized in that: A gap (1011) for installing a main control module (11) is provided at the top of the inner cavity of the housing assembly (1), and the motor (2) is electrically connected to the main control module (11).

8. The linear actuator according to claim 7, characterized in that: An adjusting device is further provided in the housing assembly (1), the adjusting device comprising a conductive sheet (6013) connected to the sliding sleeve (6) via a connecting assembly, a mounting seat (9) fixedly arranged on the inner side wall of the housing assembly (1), and a resistor sheet (10) fixedly arranged on the mounting seat (9) and extending in the length direction of the mounting seat (9); The mounting seat (9) is arranged on a side opposite to the conductive sheet (6013) and extends along the length direction of the lead screw (5), and the conductive sheet (6013) abuts against the resistor sheet (10); Two carbon film coatings (1001) for conducting electricity are symmetrically provided on one side of the resistor (10) in contact with the conductive sheet (6013), and the two carbon film coatings (1001) are electrically connected to the main control module (11) respectively.

9. The linear actuator according to claim 8, characterized in that: The connecting assembly comprises a fixing seat (601) fixedly connected to the sliding sleeve (6), a cross-shaped fixing groove (6011) provided on the fixing seat (601), and a mounting portion (6012) fixedly arranged at the center of the fixing groove (6011); The conductive sheet (6013) is a special-shaped part. During installation, one side of the conductive sheet (6013) enters the fixing groove (6011) and abuts against the inner wall of the installation groove, and is plug-connected with the installation portion (6012). The end of the other side of the conductive sheet (6013) abuts against the resistor sheet (10).

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