Electric cylinder having central motor

Abstract

An electric cylinder having a central motor. The electric cylinder having a central motor comprises a cylinder body (1), a cylinder rod (2), and a driving assembly. The cylinder body (1) is provided with a slide hole (11). The cylinder rod slidably extends / retracts in the slide hole (11). The driving assembly comprises a driving sleeve (3) and a motor (4). A hole opening of the slide hole (11) is fixedly provided with a fixed member (12). The driving sleeve (3) is rotatably connected to the fixed member (12). The driving sleeve (3) is sleeved on the cylinder rod (2) and is threadedly connected to the cylinder rod (2). The motor (4) is arranged on the fixed member (12) and can drive the driving sleeve (3) to rotate.

Description

Electric cylinder with centrally located motor

[0001] This application claims priority to Chinese Patent Application No. 202410700179.5, filed with the Chinese Patent Office on May 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of telescopic cylinder technology, for example to an electric cylinder with a centrally located motor. Background Technology

[0003] An electric cylinder is a modular product that integrates a motor and a lead screw and nut structure. It converts the rotational motion of the motor's output shaft into the linear extension and retraction motion of the cylinder rod, and is widely used in various fields.

[0004] The motor is typically located at the end of the electric cylinder structure. For example, in patent document CN104253505A, the electric cylinder structure uses a servo motor to drive a lead screw via a transmission device, and the extension and retraction of the telescopic tube relative to the cylinder body is achieved through the cooperation of the lead screw and nut structure. However, in this structure, because the servo motor and transmission device are located at the end of the cylinder body furthest from the cylinder rod, and the servo motor is generally large, this significantly occupies space at the end of the cylinder body. Since the scissor arm structure has support tubes installed at the connecting ends of adjacent forks to ensure the strength of the scissor arm, when this electric cylinder is installed on the scissor arm structure, the motor will interfere with the installation position of the support tube between the two forks at the end of the scissor arm, making it impossible to install the support tube in some positions. If the electric cylinder is to be offset to avoid the installation position of the support tube, brackets and other structures need to be installed on the scissor arm, complicating the scissor arm structure and reducing its practicality. Summary of the Invention

[0005] This application provides a centrally located electric cylinder. When the cylinder rod extends relative to the cylinder body, the motor is located in the middle of the electric cylinder, effectively reserving space at both ends of the electric cylinder, avoiding interference of the motor with the end space of the cylinder body, improving the position of the motor, and making the electric cylinder more suitable for the assembly of scissor arms.

[0006] This application provides a centrally located electric cylinder, including a cylinder body, a cylinder rod, and a drive assembly; wherein,

[0007] The cylinder body is provided with a sliding hole, and the cylinder rod slides and extends and retracts in the sliding hole;

[0008] The drive assembly includes a drive sleeve and a motor. A fixing member is fixedly provided at the opening of the sliding hole. The drive sleeve is rotatably connected to the fixing member. The drive sleeve is sleeved on the cylinder rod and threadedly connected to the cylinder rod. The motor is provided on the fixing member and can drive the drive sleeve to rotate.

[0009] In one or more embodiments, the fixing member is provided with a transmission assembly, the motor and the drive sleeve are respectively connected to the transmission assembly, and the motor drives the drive sleeve to rotate through the transmission assembly.

[0010] In one or more embodiments, the fixing member has an installation cavity, the transmission assembly and the drive sleeve are both disposed in the installation cavity, the output shaft of the motor extends into the installation cavity, and the cylinder rod passes through the installation cavity.

[0011] In one or more embodiments, the transmission assembly includes a driving gear and a driven gear, both of which are rotatably connected to the fixed member. The driving gear is fixedly sleeved on the output shaft of the motor, and the driving gear is meshed with the driven gear. The outer periphery of the drive sleeve is provided with meshing teeth, and the drive sleeve is meshed with the driven gear through the meshing teeth.

[0012] In one or more embodiments, the transmission assembly includes a driving pulley, a driven pulley, and a transmission belt. The driving pulley and the driven pulley are respectively fixedly sleeved on the output shaft of the motor and the drive sleeve. The transmission belt is sleeved on the driving pulley and the driven pulley and meshes with the driving pulley and the driven pulley.

[0013] In one or more embodiments, a speed reducer fixed to the fastener is further included, the motor is disposed on the speed reducer, the output shaft of the motor is connected to a first end of the speed reducer, and a second end of the speed reducer is connected to the transmission assembly.

[0014] In one or more embodiments, a first hinge shaft hole is provided at the end of the cylinder body away from the cylinder rod, and a second hinge shaft hole is provided at the end of the cylinder rod away from the cylinder body.

[0015] In one or more embodiments, the sliding hole is configured as a stepped hole, and a limiting end face is formed between the large end and the small end of the stepped hole; the cylinder rod is configured as a stepped rod, and an abutting end face is formed between the large end and the small end of the stepped rod.

[0016] The large end of the stepped hole is slidably connected to the large end of the stepped rod, and the small end of the stepped hole is slidably connected to the small end of the stepped rod;

[0017] The abutting end face is adapted to abut against the limiting end face when the cylinder rod extends to its limit position relative to the cylinder body.

[0018] In one or more embodiments, the cylinder body, the cylinder rod, the fixing member, and the motor are respectively coated with an anti-rust layer.

[0019] In one or more embodiments, a support member is fixedly connected between the motor and the cylinder. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the electric cylinder provided in this application;

[0021] Figure 2 is a simplified structural diagram of the electric cylinder provided in this application;

[0022] Figure 3 is a simplified structural diagram of a transmission component provided in an embodiment of this application;

[0023] Figure 4 is a simplified structural diagram of the transmission component provided in another embodiment of this application;

[0024] Figure 5 is an exploded view of the cylinder block and cylinder rod provided in this application.

[0025] In the diagram: 1. Cylinder body; 101. First hinge shaft hole; 11. Sliding hole; 111. Limiting end face; 12. Fixing component; 121. Mounting cavity; 13. Transmission assembly; 131. Driving gear; 132. Driven gear; 133. Driving pulley; 134. Driven pulley; 135. Transmission belt; 14. Support component; 2. Cylinder rod; 201. Second hinge shaft hole; 21. Abutment end face; 3. Drive sleeve; 31. Meshing teeth; 4. Motor; 5. Reducer. Detailed Implementation

[0026] The present application will now be described in conjunction with the accompanying drawings and embodiments. The embodiments described herein are merely illustrative and not intended to limit the scope of the application. For ease of description, only the parts relevant to the present application are shown in the drawings, not the entire structure.

[0027] In the description of this application, unless otherwise specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The meaning of the above terms in this application can be understood according to the actual situation.

[0028] In this application, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0030] This embodiment provides an electric cylinder with a centrally located motor. Referring to Figures 1 to 5, the electric cylinder includes a cylinder body 1, a cylinder rod 2, and a drive assembly. The cylinder body 1 has a sliding hole 11, through which the cylinder rod 2 slides and extends. The drive assembly includes a drive sleeve 3 and a motor 4. A fixing member 12 is fixedly disposed at the opening of the sliding hole 11. The drive sleeve 3 is rotatably connected to the fixing member 12, and is sleeved on the cylinder rod 2 and threadedly connected to it. The motor 4 is disposed on the fixing member 12 and can drive the drive sleeve 3 to rotate.

[0031] In this embodiment, the drive sleeve 3 is rotatably connected to the fixing member 12. The drive sleeve 3 is sleeved on the cylinder rod 2 and threadedly connected to the cylinder rod 2. The drive sleeve 3 and the cylinder rod 2 can form a screw-nut structure. The motor 4 can drive the drive sleeve 3 to rotate. With the threaded connection between the cylinder rod 2 and the drive sleeve 3 and the cooperation between the cylinder rod 2 and the sliding hole 11, the sliding extension and retraction of the cylinder rod 2 relative to the sliding hole 11 is realized. In addition, the fixing member 12 is fixed to the opening of the sliding hole 11, and the motor 4 is disposed on the fixing member 12, that is, the motor 4 is fixedly disposed to the opening of the sliding hole 11 through the fixing member 12. This embodiment provides a centrally located electric cylinder with a simple structure. When the cylinder rod 2 extends relative to the cylinder body 1, the motor 4 will always be located at the opening of the sliding hole 11, that is, the motor 4 is located in the middle of the electric cylinder. This can effectively reserve space at both ends of the electric cylinder, avoid the motor 4 interfering with the end space of the cylinder body 1, and improve the position of the motor 4 so that the electric cylinder will not interfere with the installation of the support tube of the scissor arm when it is installed with the scissor arm, thus making the electric cylinder more suitable for the assembly of the scissor arm.

[0032] For example, the drive sleeve 3 has a screw hole, and the drive sleeve 3 is sleeved on the cylinder rod 2 through the screw hole and threadedly connected to the cylinder rod 2.

[0033] In this embodiment, a transmission assembly 13 is provided on the fixing member 12. The motor 4 and the drive sleeve 3 are respectively connected to the transmission assembly 13. The motor 4 drives the drive sleeve 3 to rotate through the transmission assembly 13. Exemplarily, the output shaft of the motor 4 rotates, driving the transmission assembly 13 to rotate, so that the transmission assembly 13 drives the drive sleeve 3 to rotate.

[0034] As an optional implementation, referring to FIG3, the transmission assembly 13 includes a driving gear 131 and a driven gear 132. Both the driving gear 131 and the driven gear 132 are rotatably connected to the fixing member 12. The driving gear 131 is fixedly sleeved on the output shaft of the motor 4, and the driving gear 131 and the driven gear 132 are meshed together. The drive sleeve 3 is provided with meshing teeth 31 on its outer periphery, and the drive sleeve 3 is meshed with the driven gear 132 through the meshing teeth 31. Exemplarily, the output shaft of the motor 4 rotates, driving the driving gear 131 to rotate, the driving gear 131 drives the driven gear 132 to rotate, and the driven gear 132 then drives the drive sleeve 3 to rotate. Under the threaded engagement between the drive sleeve 3 and the cylinder rod 2, the cylinder rod 2 is driven to complete the extension and retraction action relative to the cylinder body 1.

[0035] The fixing member 12, the driving gear 131, and the driven gear 132 can be directly implemented by setting a gearbox. The gearbox includes the driving gear 131 and the driven gear 132, and the fixing member 12 is set as the housing of the gearbox.

[0036] As an optional implementation, referring to FIG4, the transmission assembly 13 includes a driving pulley 133, a driven pulley 134, and a transmission belt 135. The driving pulley 133 and the driven pulley 134 are respectively fixedly sleeved on the output shaft of the motor 4 and the drive sleeve 3. The transmission belt 135 is sleeved on the driving pulley 133 and the driven pulley 134 and meshes with them. Exemplarily, the output shaft of the motor 4 rotates, driving the driving pulley 133 to rotate. The driving gear 131 drives the transmission belt 135 to rotate, thereby driving the driven pulley 134 to rotate. The driven pulley 134 drives the drive sleeve 3 to rotate. With the threaded engagement between the drive sleeve 3 and the cylinder rod 2, the cylinder rod 2 completes the extension and retraction action relative to the cylinder body 1.

[0037] The above two structures are merely two optional embodiments of the transmission component 13, and the transmission component 13 can also be configured with other structures.

[0038] As an optional implementation, referring to FIG5, the sliding hole 11 is configured as a stepped hole, with a limiting end face 111 formed between the large and small ends of the stepped hole. The cylinder rod 2 is configured as a stepped rod, with an abutting end face 21 formed between the large and small ends of the stepped rod. The large end of the stepped hole is slidably connected to the large end of the stepped rod, and the small end of the stepped hole is slidably connected to the small end of the stepped rod. The abutting end face 21 is adapted to abut against the limiting end face 111 when the cylinder rod 2 extends outward relative to the cylinder body 1 to its limit position. Exemplarily, by configuring the sliding hole 11 as a stepped hole and the cylinder rod 2 as a stepped rod, the sliding hole 11 can form the limiting end face 111, and the cylinder rod 2 can form the abutting end face 21. When the cylinder rod 2 extends outward relative to the cylinder body 1 to its limit position, the abutting end face 21 can abut against the limiting end face 111, thereby preventing the cylinder rod 2 from disengaging from the cylinder body 1.

[0039] In this embodiment, the fixing member 12 has a mounting cavity 121, and the transmission assembly 13 and the drive sleeve 3 are both disposed in the mounting cavity 121. The output shaft of the motor 4 extends into the mounting cavity 121, and the cylinder rod 2 passes through the mounting cavity 121. By providing the mounting cavity 121, important transmission components such as the transmission assembly 13 and the drive sleeve 3 can be better protected.

[0040] For example, the electric cylinder also includes a reducer 5 fixed to the fixing member 12, a motor 4 mounted on the reducer 5, an output shaft of the motor 4 connected to a first end of the reducer 5, and a second end of the reducer 5 connected to a transmission assembly 13. In this embodiment, by setting the reducer 5, the output torque can be increased while reducing the speed of the motor 4, reducing the inertia of the load, reducing the impact on the entire transmission system when the motor 4 starts and stops, and improving the transmission efficiency and stability of the system.

[0041] In this embodiment, a first hinge shaft hole 101 is provided at the end of the cylinder body 1 away from the cylinder rod 2, and a second hinge shaft hole 201 is provided at the end of the cylinder rod 2 away from the cylinder body 1. By providing the first hinge shaft hole 101 and the second hinge shaft hole 201, it is possible to adaptably achieve hinge connection with an external scissor arm or other structure.

[0042] As an optional implementation, a support member 14 is fixedly connected between the motor 4 and the cylinder 1. By providing the support member 14, the motor 4 is prevented from being suspended relative to the cylinder 1, and the support and fixation between the motor 4 and the cylinder 1 can be further enhanced.

[0043] Optionally, the support member 14 is configured as multiple support rods, one end of which is fixed to the housing of the motor 4 and the other end is fixed to the cylinder 1.

[0044] Optionally, the support member 14 can also be configured as a support clamping block. The two opposite end faces of the support clamping block are respectively provided with a first arc-shaped clamping surface and a second arc-shaped clamping surface. The first arc-shaped clamping surface corresponds to the arc-shaped surface of the motor 4's housing, and the second arc-shaped clamping surface corresponds to the arc-shaped surface of the cylinder 1. When the support clamping block is supported between the motor 4 and the cylinder 1, the first arc-shaped clamping surface abuts against the housing surface of the motor 4, and the second arc-shaped clamping surface abuts against the outer surface of the cylinder 1, thereby achieving support and fixation between the motor 4 and the cylinder 1. Furthermore, the support clamping block facilitates installation. During installation, the support clamping block slides axially along the cylinder 1 into the space between the motor 4 and the cylinder 1, with the first arc-shaped clamping surface sliding on the housing surface of the motor 4 and the second arc-shaped clamping surface sliding on the outer surface of the cylinder 1, making installation convenient and operation easy.

[0045] As an optional implementation, the cylinder body 1, cylinder rod 2, fixing component 12, and motor 4 are each coated with an anti-rust layer. By setting the anti-rust layer, it is possible to prevent corrosion of components such as the cylinder body 1, cylinder rod 2, fixing component 12, and motor 4 that are exposed to the external environment for a long time.

Claims

1. A centrally mounted electric cylinder, comprising a cylinder body (1), a cylinder rod (2), and a drive assembly; wherein, The cylinder body (1) has a sliding hole (11), and the cylinder rod (2) slides and extends in the sliding hole (11); The drive assembly includes a drive sleeve (3) and a motor (4). A fixing member (12) is fixedly provided at the opening of the sliding hole (11). The drive sleeve (3) is rotatably connected to the fixing member (12). The drive sleeve (3) is sleeved on the cylinder rod (2) and threadedly connected to the cylinder rod (2). The motor (4) is provided on the fixing member (12) and can drive the drive sleeve (3) to rotate.

2. The electric cylinder according to claim 1, wherein, A transmission assembly (13) is provided on the fixing member (12). The motor (4) and the drive sleeve (3) are respectively connected to the transmission assembly (13). The motor (4) drives the drive sleeve (3) to rotate through the transmission assembly (13).

3. The electric cylinder according to claim 2, wherein, The fixing member (12) has an installation cavity (121), the transmission assembly (13) and the drive sleeve (3) are both located in the installation cavity (121), the output shaft of the motor (4) extends into the installation cavity (121), and the cylinder rod (2) passes through the installation cavity (121).

4. The electric cylinder according to claim 2, wherein, The transmission assembly (13) includes a driving gear (131) and a driven gear (132). Both the driving gear (131) and the driven gear (132) are rotatably connected to the fixing member (12). The driving gear (131) is fixedly sleeved on the output shaft of the motor (4). The driving gear (131) and the driven gear (132) are meshed together. The outer periphery of the drive sleeve (3) is provided with meshing teeth (31). The drive sleeve (3) is meshed with the driven gear (132) through the meshing teeth (31).

5. The electric cylinder according to claim 2, wherein, The transmission assembly (13) includes a drive pulley (133), a driven pulley (134), and a transmission belt (135). The drive pulley (133) and the driven pulley (134) are respectively fixedly sleeved on the output shaft of the motor (4) and the drive sleeve (3). The transmission belt (135) is sleeved on the drive pulley (133) and the driven pulley (134) and meshes with the drive pulley (133) and the driven pulley (134).

6. The electric cylinder according to claim 2 further includes a reducer (5) fixed on the fixing member (12), the motor (4) is disposed on the reducer (5), the output shaft of the motor (4) is connected to the first end of the reducer (5), and the second end of the reducer (5) is connected to the transmission assembly (13).

7. The electric cylinder according to claim 1, wherein, The cylinder body (1) has a first hinge shaft hole (101) at one end away from the cylinder rod (2), and the cylinder rod (2) has a second hinge shaft hole (201) at one end away from the cylinder body (1).

8. The electric cylinder according to claim 1, wherein, The sliding hole (11) is configured as a stepped hole, and a limiting end face (111) is formed between the large end and the small end of the stepped hole. The cylinder rod (2) is configured as a stepped rod, and an abutting end face (21) is formed between the large end and the small end of the stepped rod. The large end of the stepped hole is slidably connected to the large end of the stepped rod, and the small end of the stepped hole is slidably connected to the small end of the stepped rod; The abutting end face (21) is configured to abut against the limiting end face (111) when the cylinder rod (2) extends to its limit position relative to the cylinder body (1).

9. The electric cylinder according to claim 1, wherein, The cylinder body (1), the cylinder rod (2), the fixing component (12) and the motor (4) are respectively coated with an anti-rust layer.

10. The electric cylinder according to claim 1, wherein, A support member (14) is fixedly connected between the motor (4) and the cylinder (1).

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