Electric cylinder with middle motor

Abstract

The utility model belongs to the technical field of telescopic cylinders, and discloses an electric cylinder with a middle motor, the electric cylinder with the middle motor comprises a cylinder body, a cylinder rod and a driving assembly, the cylinder body is provided with a sliding hole, the cylinder rod slidably stretches in the sliding hole, the driving assembly comprises a driving sleeve and a motor, a fixing piece is fixedly arranged at an orifice of the sliding hole, and the driving sleeve is rotatably connected to the fixing piece. The driving sleeve sleeves the cylinder rod and is in threaded connection with the cylinder rod; and the motor is arranged on the fixing piece and can drive the driving sleeve to rotate. The electric cylinder is simple in structure, when the cylinder rod stretches out relative to the cylinder body, the motor is located in the middle of the electric cylinder, the space of the two ends of the electric cylinder is effectively reserved, the motor is prevented from interfering with the space of the end of the cylinder body, the position of the motor is improved, and the electric cylinder can be more suitable for assembly of a shear fork arm.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic cylinders, in particular to an electric cylinder with a centrally mounted motor. Background Art

[0002] The electric cylinder is a modular product that integrates the motor and the lead screw nut structure. It converts the rotational motion of the motor output shaft into the linear telescopic motion of the cylinder rod and is widely used in various fields.

[0003] In the prior art, the motor is generally arranged at the end of the electric cylinder structure as a whole. For example, in the patent document with publication number CN104253505A, in the electric cylinder structure, the servo motor drives the lead screw to rotate through the transmission device, and the extension and retraction of the telescopic tube relative to the cylinder body is realized with the cooperation of the lead screw nut structure. However, in the above structure, since the servo motor and the transmission device are arranged at one end of the cylinder body away from the cylinder rod, and the servo motor is generally large in size, this will greatly occupy the space at the end of the cylinder body. Since the connecting ends of the two adjacent forks of the scissor arm structure are respectively installed with support tubes to ensure the strength of the scissor arm, when the 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, which will make it impossible to install the support tube in some positions. If it is considered to displace the electric steel to avoid the installation position of the support tube, it is also necessary to install a bracket and other structures on the scissor arm, which complicates the scissor arm structure and has poor practicality. Utility Model Content

[0004] The purpose of the utility model is to provide an electric cylinder with a centrally placed motor. When the cylinder rod is extended 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 to avoid the motor interfering with the space at the end of the cylinder body, thereby improving the position of the motor and making the electric cylinder more suitable for the assembly of the scissor arms.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] An electric cylinder with a motor in the middle, comprising 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 is slidably and telescopically arranged in the sliding hole;

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

[0009] Preferably, a transmission assembly is provided on the fixing member, the motor and the drive sleeve are respectively connected to the transmission assembly, and the motor drives the drive sleeve to rotate via the transmission assembly.

[0010] Preferably, the fixing member is provided with an installation cavity, the transmission assembly and the drive sleeve are both arranged 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] Preferably, the transmission assembly includes a driving gear and a driven gear, the driving gear and the driven gear are both rotatably connected to the fixing member, the driving gear fixing sleeve is arranged on the output shaft of the motor, the driving gear is meshingly connected with the driven gear, the outer periphery of the driving sleeve is provided with meshing teeth, and the driving sleeve is meshingly connected with the driven gear through the meshing teeth.

[0012] Preferably, the transmission assembly includes a driving pulley, a driven pulley and a transmission belt, the driving pulley and the driven pulley are respectively fixedly mounted on the output shaft of the motor and the driving sleeve, and the transmission belt is mounted on the driving pulley and the driven pulley and is meshed and connected with the driving pulley and the driven pulley.

[0013] Preferably, it further comprises a reducer fixed on the fixing member, the motor is arranged on the reducer, the output shaft of the motor is connected to the first end of the reducer, and the second end of the reducer is connected to the transmission assembly.

[0014] Preferably, a first hinge shaft hole is formed at one end of the cylinder body away from the cylinder rod, and a second hinge shaft hole is formed at one end of the cylinder rod away from the cylinder body.

[0015] Preferably, the sliding hole is configured as a stepped hole, a limited end surface is formed between the large end and the small end of the stepped hole, and the cylinder rod is configured as a stepped rod, an abutting end surface is formed between the large end and the small end of the stepped rod;

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

[0017] The abutting end surface is suitable for abutting against the limiting end surface when the cylinder rod extends to the limit position relative to the cylinder body.

[0018] Preferably, the cylinder body, the cylinder rod, the fixing member and the motor are respectively coated with an anti-rust layer.

[0019] Preferably, a support is fixedly connected between the motor and the cylinder body.

[0020] Beneficial effects:

[0021] The utility model provides an electric cylinder with a motor placed in the middle, wherein the drive sleeve is rotatably connected to the fixing member, the drive sleeve is sleeved on the cylinder rod and is threadedly connected to the cylinder rod, the drive sleeve and the cylinder rod can form a screw nut structure, the motor can drive the drive sleeve to rotate, and the sliding extension and retraction of the lever relative to the sliding hole is achieved under the threaded connection between the cylinder rod and the drive sleeve and the cooperation between the cylinder rod and the sliding hole. In addition, the fixing member is fixed to the aperture of the sliding hole, and the motor is arranged on the fixing member, that is, the motor is fixedly arranged at the aperture of the sliding hole through the fixing member. When the cylinder rod is extended relative to the cylinder body, the motor will always be located at the aperture of the sliding hole, that is, the motor is located in the middle of the electric cylinder, so that the space at both ends of the electric cylinder can be effectively reserved to avoid the motor interfering with the space at the end of the cylinder body, and the position of the motor is improved, so that when the electric cylinder is installed with the scissor arm, it will not interfere with the installation of the scissor arm fork frame support tube, so that the electric cylinder can be more suitable for the assembly of the scissor arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the electric cylinder provided by the utility model;

[0023] Figure 2 It is a simplified structural diagram of the electric cylinder provided by the utility model;

[0024] Figure 3 It is a simplified structural diagram of the transmission component part provided by one embodiment of the utility model;

[0025] Figure 4 It is a simplified structural diagram of a transmission component provided by another embodiment of the utility model;

[0026] Figure 5 It is an exploded schematic diagram of the cylinder body and cylinder rod part provided by the utility model.

[0027] In the figure:

[0028] 1. Cylinder body; 101. First hinge shaft hole; 11. Sliding hole; 111. Limiting end surface; 12. Fixing member; 13. Transmission assembly; 131. Driving gear; 132. Driven gear; 133. Driving pulley; 134. Driven pulley; 135. Transmission belt; 14. Support member;

[0029] 2. Cylinder rod; 201. Second hinge shaft hole; 21. Abutment end surface;

[0030] 3. Drive sleeve;

[0031] 4. Motor;

[0032] 5. Reducer. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] This embodiment provides an electric cylinder with a centrally mounted motor. Figures 1 to 5 As shown, the electric cylinder includes a cylinder body 1, a cylinder rod 2 and a drive assembly. The cylinder body 1 is provided with a sliding hole 11, and the cylinder rod 2 slides and retracts in the sliding hole 11; the drive assembly includes a drive sleeve 3 and a motor 4, the opening of the sliding hole 11 is fixedly provided with a fixing member 12, the drive sleeve 3 is rotatably connected to the fixing member 12, the drive sleeve 3 is sleeved on the cylinder rod 2 and is threadedly connected to the cylinder rod 2, and the motor 4 is provided on the fixing member 12 and can drive the drive sleeve 3 to rotate.

[0038] 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 is threadedly connected to the cylinder rod 2, the drive sleeve 3 and the cylinder rod 2 can form a screw nut structure, and the motor 4 can drive the drive sleeve 3 to rotate. Under 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 contraction of the lever 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 arranged on the fixing member 12, that is, the motor 4 is fixed to the opening of the sliding hole 11 through the fixing member 12. 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, so that the space at both ends of the electric cylinder can be effectively reserved to avoid the motor 4 interfering with the space at the end of the cylinder body 1, and the position of the motor 4 is improved, so that when the electric cylinder is installed with the scissor arm, it will not interfere with the installation of the scissor arm fork frame support tube, so that the electric cylinder can be more suitable for the assembly of the scissor arm.

[0039] Specifically, a screw hole is provided on the driving sleeve 3 , and the driving sleeve 3 is sleeved on the cylinder rod 2 through the screw hole and is threadedly connected to the cylinder rod 2 .

[0040] In this embodiment, a transmission assembly 13 is provided on the fixing member 12, and the motor 4 and the driving sleeve 3 are respectively connected to the transmission assembly 13, and the motor 4 drives the driving sleeve 3 to rotate through the transmission assembly 13. Specifically, the output shaft of the motor 4 rotates, driving the transmission assembly 13 to rotate, so that the transmission assembly 13 drives the driving sleeve 3 to rotate.

[0041] As an optional implementation, refer to Figure 3 As shown, the transmission assembly 13 includes a driving gear 131 and a driven gear 132, both of which 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 is meshed with the driven gear 132, and the outer periphery of the driving sleeve 3 is provided with meshing teeth, and the driving sleeve 3 is meshed with the driven gear 132 through the meshing teeth. Specifically, 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 drives the driving sleeve 3 to rotate, and under the threaded cooperation between the driving sleeve 3 and the cylinder rod 2, the cylinder rod 2 is driven to complete the telescopic action relative to the cylinder body 1.

[0042] It is worth mentioning that the fixing member 12, the driving gear 131, and the driven gear 132 can be directly realized by setting a gear box. The gear box includes the driving gear 131 and the driven gear 132, and the fixing member 12 is set as the housing of the gear box.

[0043] As an optional implementation, refer to Figure 4As shown, 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 driving sleeve 3. The transmission belt 135 is sleeved on the driving pulley 133 and the driven pulley 134 and meshedly connected with the driving pulley 133 and the driven pulley 134. Specifically, 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, and the driven pulley 134 drives the driving sleeve 3 to rotate through the driven pulley 134. Under the threaded cooperation between the driving sleeve 3 and the cylinder rod 2, the cylinder rod 2 is driven to complete the telescopic action relative to the cylinder body 1.

[0044] It is worth mentioning that the above two structures are merely two optional embodiments of the transmission assembly 13 , and the transmission assembly 13 may also be configured as other structures.

[0045] As an optional implementation, refer to Figure 5 As shown, the sliding hole 11 is set as a stepped hole, and a limited end face 111 is formed between the large end and the small end of the stepped hole. The cylinder rod 2 is set 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 suitable for abutting with the limited end face 111 when the cylinder rod 2 is extended to the limit position relative to the cylinder body 1. Specifically, by setting the sliding hole 11 as a stepped hole and the cylinder rod 2 as a stepped rod, the sliding hole 11 can form the limited end face 111, and the cylinder rod 2 can form the abutting end face 21. When the cylinder rod 2 is extended to the limit position relative to the cylinder body 1, the abutting end face 21 can abut with the limited end face 111, thereby preventing the cylinder rod 2 from slipping out relative to the cylinder body 1.

[0046] In this embodiment, the fixing member 12 is provided with an installation cavity (not shown), the transmission assembly 13 and the drive sleeve 3 are both arranged in the installation cavity, the output shaft of the motor 4 extends into the installation cavity, and the cylinder rod 2 passes through the installation cavity. By providing the installation cavity, important transmission components such as the transmission assembly 13 and the drive sleeve 3 can be better protected.

[0047] Furthermore, the electric cylinder further includes a reducer 5 fixed on the fixing member 12, the motor 4 is arranged 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. In this embodiment, by providing the reducer 5, the output torque can be increased while reducing the speed of the motor 4, the inertia of the load can be reduced, the impact of the motor 4 on the entire transmission system when starting and stopping can be reduced, and the transmission efficiency and stability of the system can be improved.

[0048] In this embodiment, a first hinge axis hole 101 is provided at one end of the cylinder body 1 away from the cylinder rod 2, and a second hinge axis hole 201 is provided at one end of the cylinder rod 2 away from the cylinder body 1. By providing the first hinge axis hole 101 and the second hinge axis hole 201, it is possible to adaptively realize hinge connection with an external scissor arm or other structure.

[0049] As an optional embodiment, a support member 14 is fixedly connected between the motor 4 and the cylinder body 1. By providing the support member 14, the motor 4 is prevented from being suspended relative to the cylinder body 1, and the support and fixation between the motor 4 and the cylinder body 1 can be further enhanced.

[0050] Optionally, the support member 14 is configured as a plurality of support rods, one end of the support rod is fixed to the housing of the motor 4 , and the other end of the support rod is fixed to the cylinder body 1 .

[0051] Optionally, the support member 14 can also be configured as a support clamp. The two opposite side end faces of the support clamp are respectively provided with a first arc clamping surface and a second arc clamping surface. The first arc clamping surface is provided corresponding to the arc surface of the shell surface of the motor 4, and the second arc clamping surface is provided corresponding to the arc surface of the surface of the cylinder body 1. When the support clamp is supported between the motor 4 and the cylinder body 1, the first arc clamping surface is pressed against the shell surface of the motor 4, and the second arc clamping surface is pressed against the outer surface of the cylinder body 1, thereby enabling the support and fixation between the motor 4 and the cylinder body 1 to be achieved. In addition, the provision of the support clamp is also convenient for installation. During the installation process, the support clamp is inserted into the space between the motor 4 and the cylinder body 1 by sliding axially along the cylinder body 1, the first arc clamping surface slides on the shell surface of the motor 4, and the second arc clamping surface slides on the outer surface of the cylinder body 1, which is convenient for installation and easy to operate.

[0052] As an optional embodiment, the cylinder body 1, the cylinder rod 2, the fixing member 12 and the motor 4 are coated with an anti-rust layer. By providing the anti-rust layer, it is possible to prevent the cylinder body 1, the cylinder rod 2, the fixing member 12, the motor 4 and other components that are exposed to the external environment for a long time from rusting.

[0053] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An electric cylinder with a motor in the middle, characterized in that: It comprises a cylinder body (1), a cylinder rod (2) and a driving assembly; wherein: The cylinder body (1) is provided with a sliding hole (11), and the cylinder rod (2) slides and retracts in the sliding hole (11); The driving assembly comprises a driving sleeve (3) and a motor (4); a fixing piece (12) is fixedly provided at the opening of the sliding hole (11); the driving sleeve (3) is rotatably connected to the fixing piece (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 provided on the fixing piece (12) and is capable of driving the driving sleeve (3) to rotate.

2. The electric cylinder with a motor placed in the middle according to claim 1, characterized in that: The fixing member (12) is provided with a transmission assembly (13), the motor (4) and the drive sleeve (3) are respectively connected to the transmission assembly (13), and the motor (4) drives the drive sleeve (3) to rotate via the transmission assembly (13).

3. The electric cylinder with a motor placed in the middle according to claim 2, characterized in that: The fixing member (12) is provided with an installation cavity, the transmission assembly (13) and the drive sleeve (3) are both arranged in the installation cavity, the output shaft of the motor (4) extends into the installation cavity, and the cylinder rod (2) passes through the installation cavity.

4. The electric cylinder with a motor placed in the middle according to claim 2, characterized in that: The transmission assembly (13) comprises a driving gear (131) and a driven gear (132); the driving gear (131) and the driven gear (132) are both 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) is meshingly connected with the driven gear (132); the outer periphery of the driving sleeve (3) is provided with meshing teeth; the driving sleeve (3) is meshingly connected with the driven gear (132) via the meshing teeth.

5. The electric cylinder with a motor placed in the middle according to claim 2, characterized in that: The transmission assembly (13) comprises 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 driving sleeve (3); the transmission belt (135) is sleeved on the driving pulley (133) and the driven pulley (134), and is meshedly connected with the driving pulley (133) and the driven pulley (134).

6. The electric cylinder with a motor placed in the middle according to claim 2, characterized in that: It also includes a reducer (5) fixed on the fixing member (12), the motor (4) is arranged 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 with a central motor according to claim 1, characterized in that: A first hinge shaft hole (101) is provided at one end of the cylinder body (1) away from the cylinder rod (2), and a second hinge shaft hole (201) is provided at one end of the cylinder rod (2) away from the cylinder body (1).

8. The electric cylinder with a motor placed in the middle according to claim 1, characterized in that: The sliding hole (11) is configured as a stepped hole, a limited end surface (111) is formed between the large end and the small end of the stepped hole, and the cylinder rod (2) is configured as a stepped rod, an abutting end surface (21) is formed between the large end and the small end of the stepped rod; The large end of the step hole is slidably connected to the large end of the step rod, and the small end of the step hole is slidably connected to the small end of the step rod; The abutting end surface (21) is suitable for abutting against the limiting end surface (111) when the cylinder rod (2) extends outward to an extreme position relative to the cylinder body (1).

9. The electric cylinder with a motor placed in the middle according to claim 1, characterized in that: The cylinder body (1), the cylinder rod (2), the fixing member (12) and the motor (4) are respectively coated with an anti-rust layer.

10. The electric cylinder with a central motor according to claim 1, characterized in that: A support member (14) is fixedly connected between the motor (4) and the cylinder body (1).

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