Compact high thrust drive linear actuator

Abstract

The utility model is suitable for actuator technical field provides a kind of tight big thrust drive linear actuator, including shell, drive assembly being installed in the transmission assembly of shell inside, reduction assembly being installed in the top of shell and with the drive assembly being connected to reduction assembly, the shell includes push spring, the transmission assembly includes the shaft sleeve being installed in inner chamber inside, the roller screw and nut being installed in the shaft sleeve inside and the transmission spring being sleeved between roller screw and nut, the reduction assembly includes box and the first transmission gear, second transmission gear and third transmission gear being arranged in the box inside. The device solves the problem that vibration is generated between roller screw and nut due to the existence of thread gap under heavy load working condition, which leads to the increase of stroke error during commutation, achieves the effect of increasing the friction force between nut and roller screw through the elastic force generated by transmission spring, consuming vibration energy while reducing stroke error, improving repeat positioning accuracy.

Description

TECHNICAL FIELD

[0001] The utility model relates to actuator technical field more specifically, it relates to a compact type big thrust drive linear actuator. BACKGROUND

[0002] Linear actuator is a kind of device that converts rotary motion into linear motion, and is widely used in industrial automation, medical equipment, robots and other fields.Linear actuator is applied in the tool feeding system of large machine tool, the body lifting equipment on automobile production line, heavy tray handling in warehousing logistics and other heavy load working conditions, needs to increase driving thrust to overcome gravity, inertia force and machining resistance, reduces the displacement error caused by the elastic deformation of lead screw under heavy load, to improve machining accuracy.

[0003] The patent with publication number CN221263543U discloses a linear actuator, which controls the rotation of the servo motor after receiving the operation instruction of the servo control module, drives the harmonic reducer, and further drives the ball screw to rotate to generate linear motion.The servo control module receives the angular position feedback of the double absolute value encoder to realize double closed-loop cascade control of position and speed, has accurate position following accuracy and fast response, ensures underwater running state after pressure compensation processing by the pressure compensation mechanism, and the transmission module supports linear motion in narrow space, improves work efficiency.

[0004] Although the above-mentioned linear actuator can be used in narrow space, when the actuator is suitable for heavy load working condition, vibration occurs between the roller screw and the nut due to the existence of thread gap, which increases the idle stroke error during reversing, and finally causes the decrease of repeat positioning accuracy. Utility model content

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a compact type big thrust drive linear actuator which increases the friction force between the nut and the roller screw by the elastic force generated by the transmission spring, consumes vibration energy and reduces the idle stroke error during reversing, and improves the repeat positioning accuracy.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a compact type big thrust drive linear actuator, including the shell, drive assembly, reduction assembly and drive assembly that are installed in the shell inside, the drive assembly is installed on the top of shell, the first sealing gasket plate and the second sealing gasket plate are arranged respectively at the top and bottom of shell body and the push spring is arranged at the bottom of first sealing gasket plate, the inside of shell body forms the inner chamber, the drive assembly includes the shaft sleeve that is installed in the inner chamber, the roller screw and the nut that are installed in the shaft sleeve and the transmission spring that is sleeved between roller screw and nut, the reduction assembly includes the box and the first transmission gear, the second transmission gear and the third transmission gear that are arranged in the inside of box, and the first transmission gear, the second transmission gear and the third transmission gear are engaged with each other.

[0008] The utility model further sets up: the push spring includes the fixed plate that is installed at the bottom of first sealing gasket plate, the spring body that is connected with the fixed plate and the abutting plate that is abutted with the shaft sleeve.

[0009] The utility model further sets up: the inside one end of shaft sleeve is provided with sliding cavity, and the other end is provided with abutting cavity, the roller screw is arranged in the inside of shaft sleeve, the nut is sleeved on the outer wall of roller screw, and the nut is embedded in the inside of sliding cavity.

[0010] The utility model further sets up: one end of shaft sleeve is connected with output shaft, one end of roller screw is connected with reduction assembly, the roller screw is provided with angular contact bearing on the side close to third transmission gear, and the roller screw is provided with buffer washer on the side close to output shaft.

[0011] The utility model further sets up: angular contact bearing is installed in the inside of first sealing gasket plate, buffer washer is installed in the inside of abutting cavity, and output shaft penetrates second sealing gasket plate and is set down to second sealing gasket plate.

[0012] The utility model further sets up: the inside of first transmission gear is connected with first rotary shaft, and the first rotary shaft is rotatably installed in the inside of box.

[0013] The utility model further sets up: the inside of third transmission gear is connected with second rotary shaft, and the second rotary shaft is rotatably installed in the inside of box and is connected with roller screw downward.

[0014] The utility model further sets up: drive assembly includes motor and motor shaft, the motor shaft passes through the box and is set up, and the motor shaft is connected with first transmission gear downward.

[0015] The utility model discloses beneficial effect is: set up first transmission gear, second transmission gear and third transmission gear instead of traditional belt pulley and carry out deceleration, on the basis of increasing the reduction ratio between gear, further increase the quantity of gear, make the deceleration assembly can output greater torque, provide greater drive for transmission assembly, nut moves in the process, transmission spring gradually changes from the compressed state to the relaxed state, and the spring body changes from the compressed state to the relaxed state, and the elastic force of transmission spring and spring body can further increase the friction between nut and roller screw between, thereby partially compensate the thread gap between roller screw and nut, reduce the idle travel error when commutating, improve the repeat positioning accuracy, consume vibration energy simultaneously, reduce the low frequency oscillation of actuator in heavy load environment, improve the anti-interference ability of actuator. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model makes further explanation in combination with the drawings and examples.

[0017] Figure 1 It is the structure schematic diagram of the utility model compact type big thrust drive linear actuator.

[0018] Figure 2 It is Figure 1 The sectional view of linear actuator shown.

[0019] Figure 3 It is Figure 1 The internal structure schematic diagram of linear actuator shown.

[0020] Figure 4 It is Figure 3 The front view shown.

[0021] Mark explanation: 1, drive assembly;11, motor;12, motor shaft;

[0022] 2, deceleration assembly;21, box;22, first transmission gear;23, second transmission gear;24, first rotating shaft;25, third transmission gear;26, second rotating shaft;27, mounting plate;

[0023] 3, transmission assembly;31, shaft sleeve;32, sliding cavity;33, abutment cavity;34, roller screw;35, nut;36, angular contact bearing;37, buffer washer;38, output shaft;39, transmission spring;

[0024] 4, shell;41, shell body;42, inner chamber;43, first sealing gasket plate;44, fitting cavity;45, second sealing gasket plate;46, sealing ring;47, push spring;471, fixed plate;472, spring body;473, telescopic rod;474, abutment plate. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model more clear, the utility model will be described in detail in combination with the drawings. The drawing is a simplified schematic view, and only illustrates the basic of the utility model in a schematic manner, and therefore it only shows the components related to the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] Please refer to Figures 1-2 A compact type large thrust driving linear actuator, comprising a shell 4, a transmission assembly 3 installed inside the shell 4, a reduction assembly 2 installed on the top of the shell 4 and a driving assembly 1 connected with the reduction assembly 2, the driving assembly 1 rotates to drive the reduction assembly 2 to rotate synchronously, the torque is transmitted to the transmission assembly 3 after being reduced by the reduction assembly 2, and the transmission assembly 3 converts the rotary motion of the torque into linear motion and then outputs.

[0027] Please refer to Figures 1-4 The shell 4 comprises a shell body 41, a first sealing gasket plate 43 and a second sealing gasket plate 45 arranged at the top and bottom of the shell body 41 respectively and a push spring 47 arranged at the bottom of the first sealing gasket plate 43. The shell body 41 is a hollow cylindrical structure, and an inner cavity 42 is formed in the shell body 41. The bottom of the first sealing gasket plate 43 and the top of the shell body 41 are connected by bolts, and a circular fitting cavity 44 is formed in the first sealing gasket plate 43. The top of the second sealing gasket plate 45 and the bottom of the shell body 41 are connected by bolts, and a sealing ring 46 is arranged in the second sealing gasket plate 45. The push spring 47 is arranged around the edge of the first sealing gasket plate 43, and the push spring 47 comprises a fixed plate 471 arranged at the bottom of the first sealing gasket plate 43, a spring body 472 connected with the fixed plate 471 and an abutting plate 474 abutting against the shaft sleeve 31. The fixed plate 471 is provided with an extension rod 473 in the middle, the spring body 472 is fixedly connected with the abutting plate 474, and the extension rod 473 can guide the spring body 472 during the extension and retraction of the spring body 472, so as to avoid the deformation of the spring body 472.

[0028] Please refer to Figures 1-4The transmission assembly 3 comprises a shaft sleeve 31 installed inside the inner cavity 42, a roller screw 34 and a nut 35 installed inside the shaft sleeve 31, and a transmission spring 39 sleeved between the roller screw 34 and the nut 35. The shaft sleeve 31 has a hollow cylindrical structure, the outer diameter of the shaft sleeve 31 is matched with the inner diameter of the shell 41, a sliding groove is formed in the inner part of the shell 41, and a sliding strip matched with the sliding groove is arranged on the outer wall of the shaft sleeve 31, so that the shaft sleeve 31 can slide inside the inner cavity 42. A sliding cavity 32 is formed at one end of the inner part of the shaft sleeve 31, and an abutting cavity 33 is formed at the other end. The roller screw 34 is arranged inside the shaft sleeve 31, one end of the roller screw 34 is connected with the speed reduction assembly 2, and the roller screw 34 can rotate synchronously with the speed reduction assembly 2. The nut 35 is sleeved on the outer wall of the roller screw 34, and during the rotation of the roller screw 34, the nut 35 can move along the direction of the roller screw 34, and finally drive the shaft sleeve 31 to slide, converting the rotary motion into linear motion. During the movement of the nut 35, the transmission spring 39 sleeved between the roller screw 34 and the nut 35 gradually changes from the compressed state to the relaxed state, the elastic force generated by the transmission spring 39 can further increase the friction force between the nut 35 and the roller screw 34, thereby partially compensating the thread gap between the roller screw 34 and the nut 35, reducing the backlash error during commutation, improving the repeat positioning accuracy; at the same time, the vibration energy is consumed, the low-frequency oscillation of the actuator in the heavy load environment is reduced, and the anti-interference ability of the actuator is improved. The nut 35 is embedded in the sliding cavity 32, the bottom of the nut 35 is fixedly connected with the shaft sleeve 31, and the nut 35 can drive the shaft sleeve 31 to slide synchronously during the sliding process. The abutting plate 474 abuts against the top of the shaft sleeve 31, and during the sliding process of the shaft sleeve 31 along the inner cavity 42 following the nut, the spring body 472 changes from the compressed state to the relaxed state, the elastic force generated by the spring body 472 is uniformly transmitted to the shaft sleeve 31 through the abutting plate 474, further increasing the friction force between the nut 35 and the roller screw 34. The height of the telescopic rod 473 is less than the distance between the shaft sleeve 31 in the initial state and the first sealing gasket plate 43, so that the shaft sleeve 31 can normally slide, and at the same time, the telescopic rod 473 can abut against the abutting plate 474 when the spring body 472 is in the compressed state, the pressure received by the abutting plate 474 is transmitted through the telescopic rod 473, and the service life of the spring body 472 is prolonged. One end of the shaft sleeve 31 is fixedly connected with the output shaft 38, the sealing ring 46 is sleeved on the outer side of the output shaft 38, and the shaft sleeve 31 can synchronously drive the output shaft 38 to slide during the sliding process.

[0029] Please refer to Figures 1-4The roller screw 34 is provided with an angular contact bearing 36 on the side close to the speed reduction assembly 2, and is provided with a buffer washer 37 on the side close to the output shaft 38. The angular contact bearing 36 is installed inside the first sealing gasket plate 43, specifically, the angular contact bearing 36 is installed inside the embedded cavity 44. The buffer washer 37 is installed inside the abutting cavity 33 on the shaft sleeve 31, and the bottom of the buffer washer 37 is flush with the bottom of the shaft sleeve 31. When the shaft sleeve 31 slides along the inner cavity 42 to contact the second sealing gasket plate 45, the buffer washer 37 can provide buffering for the shaft sleeve 31. The output shaft 38 is arranged inside the buffer washer 37, and the output shaft 38 penetrates the second sealing gasket plate 45 downward.

[0030] Please refer to Figures 1-4 The speed reduction assembly 2 includes a box body 21 and a first transmission gear 22, a second transmission gear 23 and a third transmission gear 25 arranged inside the box body 21. The box body 21 is arranged in a hollow structure, and the bottom of the box body 21 is connected with the top of the first sealing gasket plate 43. The first transmission gear 22, the second transmission gear 23 and the third transmission gear 25 are meshed with each other, and the speed reduction ratio between the first transmission gear 22 and the second transmission gear 23 and between the second transmission gear 23 and the third transmission gear 25 is 5:1. By increasing the number of gears on the basis of increasing the speed reduction ratio between the gears, the overall speed reduction ratio of the speed reduction assembly 2 can be effectively increased, so that the speed reduction assembly 2 can output greater torque, thereby providing greater driving force for the transmission assembly 3. The third transmission gear 25 is arranged above the first sealing gasket plate 43 and coaxially arranged with the roller screw 34. The third transmission gear 25 is connected with a second rotating shaft 26 inside the third transmission gear 25, and the second rotating shaft 26 is rotatably installed inside the box body 21 and connected with the roller screw 34 downward. The angular contact bearing 36 is arranged on the side of the roller screw 34 close to the third transmission gear 25, and the second rotating shaft 26 penetrates the angular contact bearing 36. The second transmission gear 23 is connected with a first rotating shaft 24 inside the second transmission gear 23, and the first rotating shaft 24 is rotatably installed inside the box body 21, and the second transmission gear 23 can rotate relative to the box body 21.

[0031] Please refer to Figures 1-4 The driving assembly 1 includes a motor 11 and a motor shaft 12. The motor 11 is installed on the top of the box body 21, the motor shaft 12 penetrates the box body 21 and is connected with the first transmission gear 22 downward. The operation of the motor 11 can drive the first transmission gear 22 to rotate synchronously through the motor shaft 12, and then drive the second transmission gear 23 and the third transmission gear 25 to rotate synchronously through the meshing between the first transmission gear 22, the second transmission gear 23 and the third transmission gear 25. During the rotation process, greater torque can be output through the transmission of the speed reduction ratio between the first transmission gear 22, the second transmission gear 23 and the third transmission gear25.

[0032] Specifically, when the linear actuator is running, the motor 11 runs through the motor shaft 12 to drive the first transmission gear 22 to rotate, further drive the second transmission gear 23 and the third transmission gear 25 to rotate, in the rotating process, through the transmission of the speed reduction ratio between the first transmission gear 22, the second transmission gear 23 and the third transmission gear 25, a larger torque is output. The torque output by the third transmission gear 25 is synchronously transmitted to the roller screw 34 through the second rotating shaft 26, and the roller screw 34 is driven to rotate. In the rotating process of the roller screw 34, the nut 35 sleeved on the outer wall of the roller screw 34 generates rolling friction with the roller screw 34, so that the nut 35 moves along the roller screw 34, drives the shaft sleeve 31 to slide, converts the rotary motion into linear motion, and then drives the output shaft 38 to slide through the shaft sleeve 31, thereby completing the output of the actuator. In the moving process of the nut 35, the transmission spring 39 gradually changes from the compressed state to the relaxed state, and the spring body 472 changes from the compressed state to the relaxed state. The elastic force generated by the transmission spring 39 and the spring body 472 can further increase the friction between the nut 35 and the roller screw 34, thereby partially compensating for the thread gap between the roller screw 34 and the nut 35, reducing the backlash error during reversing, improving the repeat positioning accuracy, and at the same time consuming vibration energy, reducing the low-frequency oscillation of the actuator in the heavy load environment, and improving the anti-interference ability of the actuator.

[0033] The first transmission gear 22, the second transmission gear 23 and the third transmission gear 25 are arranged to replace the traditional belt pulley for speed reduction, and on the basis of increasing the speed reduction ratio between the gears, the number of gears is further increased, so that the overall speed reduction ratio of the speed reduction assembly 2 can be effectively increased, and the speed reduction assembly 2 can output a larger torque to provide a larger driving force for the transmission assembly 3.

[0034] In the description of the utility model, it needs to explain, unless there is explicit stipulation and limit term " install " " link " " connection " should make broad sense, for example, can be fixed connection, also can be detachable connection or integral connection, can be mechanical connection, can be direct connection or indirect connection through intermediate medium, can be the intercommunication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] It needs to be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model to having a specific orientation, being constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0036] The above is according to the ideal embodiment of the present application, through the above description, the relevant staff can fully change and modify without deviating from the scope of the present application. The technical scope of the present application is not limited to the content of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A compact, high-thrust driven linear actuator, characterized in that: The assembly includes a housing (4), a transmission assembly (3) installed inside the housing (4), a reduction assembly (2) installed on the top of the housing (4), and a drive assembly (1) connected to the reduction assembly (2). The housing (4) includes a shell (41), a first sealing gasket (43) and a second sealing gasket (45) respectively disposed on the top and bottom of the shell (41), and a push spring (47) disposed on the bottom of the first sealing gasket (43). An inner cavity (42) is formed inside the shell (41). The transmission assembly (3) includes a mounting... The bushing (31) inside the inner cavity (42), the roller screw (34) and nut (35) installed inside the bushing (31), and the transmission spring (39) sleeved between the roller screw (34) and nut (35) are included. The deceleration assembly (2) includes a housing (21) and a first transmission gear (22), a second transmission gear (23) and a third transmission gear (25) disposed inside the housing (21). The first transmission gear (22), the second transmission gear (23) and the third transmission gear (25) mesh with each other.

2. The compact high-thrust linear actuator according to claim 1, characterized in that: The push spring (47) includes a fixed plate (471) mounted on the bottom of the first sealing gasket (43), a spring body (472) connected to the fixed plate (471), and a retaining plate (474) abutting against the bushing (31).

3. The compact high-thrust linear actuator according to claim 1, characterized in that: The bushing (31) has a sliding cavity (32) at one end and an abutment cavity (33) at the other end. The roller screw (34) is located inside the bushing (31). A nut (35) is sleeved on the outer wall of the roller screw (34). The nut (35) is fitted inside the sliding cavity (32).

4. A compact high-thrust linear actuator according to claim 3, characterized in that: One end of the bushing (31) is connected to the output shaft (38), and one end of the ball screw (34) is connected to the reduction assembly (2). An angular contact bearing (36) is provided on the side of the ball screw (34) near the third transmission gear (25), and a buffer washer (37) is provided on the side of the ball screw (34) near the output shaft (38).

5. A compact, high-thrust linear actuator according to claim 4, characterized in that: The angular contact bearing (36) is installed inside the first sealing gasket (43), the buffer washer (37) is installed inside the abutment cavity (33), and the output shaft (38) passes through the second sealing gasket and is set downward.

6. A compact high-thrust linear actuator according to claim 1, characterized in that: The second transmission gear (23) is internally connected to a first rotating shaft (24), which is rotatably installed inside the housing (21).

7. A compact high-thrust linear actuator according to claim 6, characterized in that: The third transmission gear (25) is internally connected to a second rotating shaft (26), which is rotatably installed inside the housing (21) and downwardly connected to the ball screw (34).

8. A compact high-thrust linear actuator according to claim 1, characterized in that: The drive assembly (1) includes a motor (11) and a motor shaft (12). The motor shaft (12) is disposed through the housing (21) and is connected downward to the first transmission gear (22).

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