Compact electric cylinder

Abstract

The utility model relates to electric cylinder manufacturing technical field, concretely relates to a compact electric cylinder. Include: motor, the motor includes output pivot, rotating seat, rotating seat sets up at one side of motor, drive rotor is rotatoryly established on rotating seat, output pivot is connected with drive rotor transmission, the inbuilt cavity of axial extension is equipped in output pivot, the inbuilt cavity near rotating seat one side opening, the inbuilt cavity extends into the motor, telescopic screw rod, drive rotor is set up on telescopic screw rod and is cooperated with telescopic screw rod screw, telescopic screw rod one end is equipped with transmission connection structure, transmission connection structure sets up at drive rotor far from motor one side, the one end of telescopic screw rod far from transmission connection structure is accommodated in the inbuilt cavity. The compactness of electric cylinder has been improved.

Description

Technical Field

[0001] This utility model relates to the field of electric cylinder manufacturing technology, specifically to a compact electric cylinder. Background Technology

[0002] Traditional electric cylinders consist of a motor driving a screw to rotate, which in turn moves a nut on the screw axially. The nut is connected to a telescopic moving assembly, which in turn moves the telescopic moving assembly, creating a linear drive. Because the axial position of the screw is fixed and corresponds to the stroke of the telescopic moving assembly, the electric cylinder suffers from poor space compactness. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a compact electric cylinder, which improves the overall compactness of the electric cylinder.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A compact electric cylinder includes:

[0006] The motor includes an output shaft;

[0007] A rotating base is disposed on one side of the motor. A drive rotor is rotatably mounted on the rotating base. An output shaft is connected to the drive rotor. An axially extending storage cavity is provided inside the output shaft. The storage cavity opens near the rotating base and extends into the motor.

[0008] A telescopic lead screw is provided, and the drive rotor is sleeved on the telescopic lead screw and threadedly engaged with the telescopic lead screw; one end of the telescopic lead screw is provided with a transmission connection structure, which is located on the side of the drive rotor away from the motor, and the end of the telescopic lead screw away from the transmission connection structure is stored in a storage cavity.

[0009] Furthermore, in this application, a compact electric cylinder includes a drive gear mounted on an output shaft, a set of planetary gears rotatably mounted on the drive rotor, the set of planetary gears being circumferentially arrayed around the drive gear and meshing with it, and a gear carrier fixed relative to the motor. The gear carrier has an internal gear cavity, and the set of planetary gears is disposed within the internal gear cavity and meshes with the internal teeth of the internal gear cavity. As a preferred embodiment of this application, based on the above structure, the drive gear, planetary gears, and internal gear cavity form a planetary reducer, and the mounting of the planetary gears on the drive rotor further enhances the structural compactness.

[0010] Furthermore, in a compact electric cylinder of this application, the motor includes a motor housing, a gear carrier mounted on the motor housing, and a rotating seat mounted on the gear carrier on the side away from the motor housing; the motor housing, gear carrier, and rotating seat are axially connected in series via threaded fasteners. As a preferred embodiment of this application,

[0011] Furthermore, in a compact electric cylinder of this application, the drive rotor includes a cylinder and a transmission nut. The cylinder has an axially penetrating cavity, and the planetary gear is rotatably mounted on the side wall of the cylinder corresponding to the cavity. The transmission nut is coaxially mounted on the cylinder and is installed at the end of the cylinder away from the motor. The transmission nut is sleeved on the telescopic screw and threadedly engaged with the telescopic screw.

[0012] Furthermore, in a compact electric cylinder of this application, the rotating seat is provided with an axially penetrating mounting cavity, the cylinder is rotatably mounted in the mounting cavity, and a bearing is provided radially between the mounting cavity and the cylinder, the bearings being arranged in pairs.

[0013] Furthermore, in a compact electric cylinder of this application, the bearing includes an outer ring and an inner ring that radially abut against the side wall of the mounting cavity and the outer wall of the cylinder, respectively. The side wall of the mounting cavity is provided with an annular isolation portion between a pair of pairs of outer rings axially, and the pair of outer rings abut against the annular isolation portion axially.

[0014] The cylinder is provided with a pair of limiting platforms, which respectively abut against the two inner rings on opposite sides that are axially separated.

[0015] Furthermore, in a compact electric cylinder of this application, the limiting platform includes a boss extending on the cylinder body and near the planetary gear side, and a locking nut threadedly connected to the end of the cylinder body away from the planetary gear.

[0016] Furthermore, a compact electric cylinder in this application also includes an oil baffle ring, which is installed radially between the locking nut and the mounting cavity.

[0017] Furthermore, a compact electric cylinder in this application also includes a pressure detection element disposed within a rotating seat. The pressure detection element is used to detect the axial pressure on at least one bearing to determine the axial load on the telescopic lead screw.

[0018] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0019] This utility model provides a compact electric cylinder. The principle is as follows: the output shaft has a storage cavity for storing the telescopic lead screw, the transmission connection structure is used to connect external moving parts, the axial position of the drive rotor is fixed, and the telescopic lead screw passes through the drive rotor. Since the axial dimension of the drive rotor is shorter than that of the telescopic lead screw, and the telescopic lead screw can be stored inside the motor, the overall compactness of the electric cylinder is improved. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a compact electric cylinder according to an embodiment of this application;

[0021] Figure 2 for Figure 1 A magnified view of a portion of area A in the center circle;

[0022] Figure 3 This is an exploded view of a component of a compact electric cylinder according to an embodiment of this application.

[0023] In the diagram: 1-Motor; 11-Output shaft; 110-Receiving cavity; 12-Drive gear; 13-Motor housing; 2-Rotating seat; 20-Mounting cavity; 201-Annular isolation part; 3-Telescopic lead screw; 31-Transmission connection structure; 4-Gear frame; 41-Internal gear cavity; 5-Drive rotor; 50-Cylinder cavity; 51-Planetary gear; 52-Cylinder body; 53-Transmission nut; 54-Boss; 55-Locking nut; 6-Bearing; 61-Outer ring; 62-Inner ring; 7-Oil retainer ring; 91-Connecting hole; 92-Screw. Detailed Implementation Example

[0024] Combination Figure 1 , Figure 2 and Figure 3 The compact electric cylinder shown combines Figures 1 to 3 A compact electric cylinder shown includes:

[0025] Motor 1, which includes an output shaft 11;

[0026] Rotary seat 2 is located on one side of motor 1. A drive rotor 5 is rotatably mounted on the rotating seat 2. The output shaft 11 is connected to the drive rotor 5. An axially extending storage cavity 110 is provided inside the output shaft 11. The storage cavity 110 opens on the side near the rotating seat 2 and extends into the motor 1.

[0027] The telescopic lead screw 3 and the drive rotor 5 are sleeved on the telescopic lead screw 3 and threadedly engaged with the telescopic lead screw 3; one end of the telescopic lead screw 3 is provided with a transmission connection structure 31, which is located on the side of the drive rotor 5 away from the motor 1, and the end of the telescopic lead screw 3 away from the transmission connection structure 31 is stored in the storage cavity 110.

[0028] Based on the above structure, the principle of a compact electric cylinder is as follows: the output shaft 11 is provided with a storage cavity 110, which is in the shape of a tube, for storing the telescopic lead screw 3. The transmission connection structure 31 is used to connect external moving parts. The axial position of the drive rotor 5 is fixed. The telescopic lead screw 3 passes through the drive rotor 5. Since the axial dimension of the drive rotor 5 is shorter than that of the telescopic lead screw 3, and the telescopic lead screw 3 can be stored inside the motor 1, the overall compactness of the electric cylinder is improved.

[0029] Furthermore, in this embodiment, a drive gear 12 is mounted on the output shaft 11, and a set of planetary gears 51 are rotatably mounted on the drive rotor 5. The set of planetary gears 51 are arranged in a circumferential array around the drive gear 12 and mesh with the drive gear 12. In this embodiment, the number of planetary gears 51 is 3. It also includes a gear carrier 4 fixedly mounted relative to the motor 1. The gear carrier 4 is provided with an internal tooth cavity 41, and the set of planetary gears 51 are disposed in the internal tooth cavity 41 and mesh with the internal teeth of the internal tooth cavity 41.

[0030] Based on the above structure, the drive gear 12, planetary gear 51, and internal gear cavity 41 form a planetary reducer to improve torque output, and the planetary gear 51, mounted on the drive rotor 5, further enhances the structural compactness. In other embodiments, the output shaft 11 can be directly connected to the drive rotor 5.

[0031] In this embodiment, the motor 1 includes a motor housing 13, a gear carrier 4 is mounted on the motor housing 13, and a rotating seat 2 is mounted on the gear carrier 4 on the side away from the motor housing 13; the motor housing 13, the gear carrier 4 and the rotating seat 2 are axially connected in series by threaded fasteners.

[0032] Specifically, such as Figure 3 As shown, the motor housing 13 and the gear carrier 4 are provided with axially corresponding connecting holes 91. The threaded fastener is a set of screws 92 that pass through the connecting holes 91. The front end of the screws 92 is connected to the threaded hole (not shown) on the rotating seat 2.

[0033] In this embodiment, the drive rotor 5 includes a cylindrical body 52 and a transmission nut 53. The cylindrical body 52 has an axially penetrating cavity 50. The planetary gear 51 is rotatably mounted on the side wall of the cylindrical body 52 corresponding to the cavity 50. The transmission nut 53 is coaxially mounted on the cylindrical body 52 and is installed at the end of the cylindrical body 52 away from the motor 1. The transmission nut 53 is sleeved on the telescopic screw 3 and threadedly engaged with the telescopic screw 3. The cylindrical body 52 and the transmission nut 53 are machined separately and then assembled, which can reduce the difficulty of machining high-precision threads.

[0034] In this embodiment, the rotating seat 2 is provided with an axially penetrating mounting cavity 20, and the cylinder 52 is rotatably mounted in the mounting cavity 20. A bearing 6 is provided radially between the mounting cavity 20 and the cylinder 52, and the bearings 6 are arranged in pairs.

[0035] In this embodiment, the bearing 6 includes an outer ring 61 and an inner ring 62 that radially abut against the side wall of the mounting cavity 20 and the outer wall of the cylinder 52, respectively. An annular isolation portion 201 is provided between one pair of pairs of inner rings 61 axially, and the other pair of inner rings 61 axially abut against the annular isolation portion 201. A pair of limiting platforms are provided on the cylinder 52, each abutting against one side of the pair of inner rings 62 that is axially away from each other. This prevents the bearing 6 from shifting when the lead screw 3 is under force.

[0036] In this embodiment, the limiting platform includes a boss 54 extending on the cylinder 52 and near the planetary gear 51, and a locking nut 55 threaded to the end of the cylinder 52 away from the planetary gear 51.

[0037] In this embodiment, an oil retainer ring 7 is also included, which is installed radially between the locking nut 55 and the mounting cavity 20. The oil retainer ring 7 prevents grease leakage and external impurities from entering the bearing, thus extending its service life.

[0038] Furthermore, in this embodiment, a pressure detection element (not shown) is also included. The pressure detection element is disposed in the rotating seat 2 and is used to detect the axial pressure on at least one bearing 6 in order to determine the axial load on the telescopic screw 3.

[0039] In one embodiment, the pressure sensing element may be disposed between the annular isolation portion 201 and the outer ring 61 in the axial direction; in other embodiments, the pressure sensing unit may be disposed between the inner ring 62 and the limiting stage in the axial direction.

[0040] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A compact electric cylinder, characterized in that, include: The motor (1) includes an output shaft (11). Rotary seat (2), the rotating seat (2) is set on one side of motor (1), a drive rotor (5) is rotatably mounted on the rotating seat (2), the output shaft (11) is connected to the drive rotor (5) in a transmission, the output shaft (11) is provided with an axially extending storage cavity (110), the storage cavity (110) opens on the side near the rotating seat (2), and the storage cavity (110) extends into the motor (1); The telescopic screw (3) and the drive rotor (5) are sleeved on the telescopic screw (3) and threaded together; one end of the telescopic screw (3) is provided with a transmission connection structure (31), the transmission connection structure (31) is located on the side of the drive rotor (5) away from the motor (1), and the end of the telescopic screw (3) away from the transmission connection structure (31) is stored in the storage cavity (110).

2. A compact electric cylinder according to claim 1, characterized in that: A drive gear (12) is mounted on the output shaft (11). A set of planetary gears (51) is rotatably mounted on the drive rotor (5). The set of planetary gears (51) is arranged in a circumferential array on the outer circumference of the drive gear (12) and meshes with the drive gear (12). The drive rotor (5) also includes a gear carrier (4) fixedly mounted relative to the motor (1). The gear carrier (4) is provided with an internal tooth cavity (41). The set of planetary gears (51) is located in the internal tooth cavity (41) and meshes with the internal teeth of the internal tooth cavity (41).

3. A compact electric cylinder according to claim 2, characterized in that: The motor (1) includes a motor housing (13), the gear frame (4) is mounted on the motor housing (13), and the rotating seat (2) is mounted on the gear frame (4) on the side away from the motor housing (13); the motor housing (13), the gear frame (4) and the rotating seat (2) are axially connected in series by threaded fasteners.

4. A compact electric cylinder according to claim 1, characterized in that: The drive rotor (5) includes a cylinder (52) and a transmission nut (53). The cylinder (52) has an axially penetrating cavity (50). The planetary gear (51) is rotatably mounted on the side wall of the cylinder (52) corresponding to the cavity (50). The transmission nut (53) is coaxially mounted on the cylinder (52). The transmission nut (53) is installed at the end of the cylinder (52) away from the motor (1). The transmission nut (53) is sleeved on the telescopic screw (3) and threadedly engaged with the telescopic screw (3).

5. A compact electric cylinder according to claim 4, characterized in that: The rotating seat (2) is provided with an axially penetrating mounting cavity (20), and the cylinder (52) is rotatably mounted in the mounting cavity (20). A bearing (6) is provided radially between the mounting cavity (20) and the cylinder (52), and the bearings (6) are arranged in pairs.

6. A compact electric cylinder according to claim 5, characterized in that: The bearing (6) includes an outer ring (61) and an inner ring (62) that radially abut against the side wall of the mounting cavity (20) and the outer wall of the cylinder (52) respectively. The side wall of the mounting cavity (20) is provided with an annular isolation portion (201) between a pair of outer rings (61) in the axial direction. The pair of outer rings (61) abut against the annular isolation portion (201) in the axial direction. The cylinder (52) is provided with a pair of limiting platforms, which respectively abut against the axially distancing sides of the pair of inner rings (62).

7. A compact electric cylinder according to claim 6, characterized in that: The limiting platform includes a boss (54) extending on the cylinder (52) and near the planetary gear (51) and a locking nut (55) threaded to the end of the cylinder (52) away from the planetary gear (51).

8. A compact electric cylinder according to claim 7, characterized in that: It also includes an oil baffle ring (7), which is installed radially between the lock nut (55) and the mounting cavity (20).

9. A compact electric cylinder according to claim 6, characterized in that: It also includes a pressure detection element, which is disposed in the rotating seat (2). The pressure detection element is used to detect the axial pressure on at least one bearing (6) to determine the axial load on the telescopic screw (3).

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