Nut drive electric cylinder

Abstract

The utility model discloses a nut drive type electric cylinder, include: motor, screw nut, fixed component, transmission component, ball screw and dustproof subassembly, the motor is used for transmission power, the outer surface of screw nut forms the gear tooth, fixed component and screw nut bearing connection, the fixed component is used for fixing screw nut, transmission component is used for transmitting the power of motor to screw nut, screw nut is sleeved on ball screw, and screw nut is used for driving ball screw to do linear reciprocating motion, ball screw is located in dustproof subassembly, and dustproof subassembly is used for dustproof protection to ball screw, the utility model discloses have the advantage that the overall size is short, and the installation applicability is strong.

Description

Technical Field

[0001] This utility model belongs to the field of drive equipment technology, specifically relating to electric cylinders, and more particularly to a nut-driven electric cylinder. Background Technology

[0002] Nut-driven electric cylinders are commonly used in scissor lifts, aerial work platforms, and similar applications. They employ a motor-driven lead screw, which in turn moves a lead screw nut in a linear motion. During this linear motion, the lead screw nut drives a connected piston rod in a linear reciprocating motion. To optimize space and shorten the overall length of the electric cylinder, the motor's output shaft is often parallel to the lead screw's axis, and a transmission assembly is used to transmit the motor's power to the lead screw. However, in this configuration, the motor's output and the piston rod's output directions are opposite. Therefore, even when the piston rod is fully in the output state, it still occupies a significant amount of space on the motor's tail side, severely limiting its installation in equipment. To address this issue, a nut-driven electric cylinder is proposed. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, this utility model proposes a nut-driven electric cylinder, which has the advantages of short overall size and strong installation applicability.

[0005] A nut-driven electric cylinder according to an embodiment of the present invention includes: a motor, a lead screw nut, a fixing component, a transmission component, a ball screw, and a dustproof component; the motor is used to transmit power; the outer surface of the lead screw nut has gear teeth; the fixing component is connected to the lead screw nut bearing and is used to fix the lead screw nut; the transmission component is used to transmit the power of the motor to the lead screw nut; the lead screw nut is sleeved on the ball screw and is used to drive the ball screw to perform linear reciprocating motion; the ball screw is disposed inside the dustproof component, and the dustproof component is used to protect the ball screw from dust.

[0006] According to one embodiment of the present invention, the transmission assembly includes: a helical gear, a first gear, a second gear, and a flat key; the helical gear is disposed on the output end of the motor; the first gear meshes with the helical gear; the second gear meshes with the teeth on the outer surface of the lead screw nut; both the first gear and the second gear are sleeved on the flat key.

[0007] According to one embodiment of the present invention, the transmission assembly further includes: a housing, wherein the transmission assembly and the ball screw nut are both located inside the housing, the housing has a first opening, a second opening and a third opening, the first opening is sealed to the motor, the second opening and the third opening are respectively located on the moving path of the ball screw, and the dustproof assembly seals the second opening and the third opening.

[0008] According to one embodiment of the present invention, the dustproof assembly includes: a cylinder and a dust cover; the cylinder is sealed to a second opening; one end of the dust cover is sealed to a third opening, and the other end of the dust cover is connected to one end of a ball screw; the dust cover is flexible.

[0009] According to one embodiment of the present invention, one end of the ball screw is connected to a rod head, and the rod head protrudes from the dust cover.

[0010] According to one embodiment of the present invention, the dust cover is a corrugated dustproof protective sleeve.

[0011] According to one embodiment of the present invention, a safety nut is further provided inside the housing, the safety nut is sleeved on the ball screw, and the safety nut is located on one side of the screw nut.

[0012] According to one embodiment of the present invention, the motor is provided with a centrifugal brake, which is used to control the speed of the motor.

[0013] According to one embodiment of the present invention, the lead screw nut and the gear teeth on its outer surface are integrally formed.

[0014] According to one embodiment of the present invention, the helical gear and the output end of the motor are integrally formed.

[0015] The beneficial effect of this utility model is that it uses a transmission component to transmit the power of the motor to the lead screw nut, avoiding the motor and piston rod being placed on the same straight line, realizing a staggered layout, and shortening the overall length of the electric cylinder.

[0016] By using a motor to drive the lead screw nut, the ball screw directly serves as the piston rod of the electric cylinder, reducing the number of transmission components, shrinking the overall size of the electric cylinder, and placing the rod nut in the middle of the ball screw's entire stroke, thus increasing the applicability of the electric cylinder's installation.

[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments with accompanying drawings, in which:

[0020] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0021] Figure label:

[0022] 2. Motor; 3. First gear; 4. Key; 5. Second gear; 8. Ball screw; 10. Screw nut; 13. Dust cover; 15. Housing; 18. Cylinder; 19. Centrifugal brake; 20. Safety nut; 21. Rod head; 22. Helical gear. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The nut-driven electric cylinder of this utility model is described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the nut-driven electric cylinder according to an embodiment of the present invention includes: a motor 2, a lead screw nut 10, a fixing component, a transmission component, a ball screw 8, and a dustproof component; the motor 2 is used to transmit power; the outer surface of the lead screw nut 10 has gear teeth; the fixing component is connected to the lead screw nut 10 by a bearing, and the fixing component is used to fix the lead screw nut 10; the transmission component is used to transmit the power of the motor 2 to the lead screw nut 10; the lead screw nut 10 is sleeved on the ball screw 8, and the lead screw nut 10 is used to drive the ball screw 8 to perform linear reciprocating motion; the ball screw 8 is disposed in the dustproof component, and the dustproof component is used to protect the ball screw 8 from dust, and the lead screw nut 10 and the gear teeth on its outer surface are integrally formed.

[0028] In this embodiment, the motor 2 starts and drives the transmission assembly, which in turn drives the lead screw nut 10. Under the constraint of the fixed assembly, the lead screw nut 10 only rotates, thereby driving the ball screw 8 to move linearly. By using the transmission assembly to transmit the power of the motor 2 to the lead screw nut 10, the motor 2 and the piston rod are not placed on the same straight line, thus achieving a staggered layout and shortening the overall length of the electric cylinder. By using the motor 2 to drive the lead screw nut 10, the ball screw 8 directly serves as the piston rod of the electric cylinder, reducing the number of transmission components and shrinking the overall size of the electric cylinder. Furthermore, the position of the lead screw nut 10 is located in the middle of the entire stroke of the ball screw 8, making the lengths on both sides of the motor 2 similar when the electric cylinder is fully open. This increases the stability of the electric cylinder and reduces the space required for installing the electric cylinder in the equipment, thus increasing the applicability of the electric cylinder installation.

[0029] The transmission assembly includes: a helical gear 22, a first gear 3, a second gear 5, and a flat key 4; the helical gear 22 is located on the output end of the motor 2; the first gear 3 meshes with the helical gear 22; the second gear 5 meshes with the teeth on the outer surface of the lead screw nut 10; both the first gear 3 and the second gear 5 are fitted onto the flat key 4; the helical gear 22 and the output end of the motor 2 are integrally formed.

[0030] The transmission assembly also includes a housing 15, in which the transmission assembly and the lead screw nut 10 are located. The housing 15 has a first opening, a second opening, and a third opening. The first opening is sealed to one end of the motor 2 with an output end. The output end of the motor 2 is located inside the housing 15. The second and third openings are located on the movement path of the ball screw 8, respectively. The ball screw 8 passes through the second and third openings. The dustproof assembly seals the second and third openings.

[0031] The dustproof assembly includes: a cylinder 18 and a dust cover 13; the end of the cylinder 18 is sealed to the second opening; one end of the dust cover 13 is sealed to the third opening, and the other end of the dust cover 13 is sealed to one end of the ball screw 8. One end of the ball screw 8 is connected to a rod head 21, which protrudes from the dust cover 13. The dust cover 13 is flexible.

[0032] In this embodiment, the rod head 21 is used to connect the driven device. The fixing component is fixedly installed inside the housing 15. The flat key 4 is connected to the inside of the housing 15 by a bearing. The motor 2 drives the helical gear 22 to rotate, which in turn drives the first gear 3 to rotate. At this time, the second gear 5 located on the same flat key 4 rotates, thereby driving the lead screw nut 10 to rotate. The dimensions of the helical gear 22, the first gear 3, the second gear 5, and the lead screw nut 10 can be set according to the required torque. This allows the transmission component to replace the reducer, further reducing the number of transmission components and lowering the cost. By directly placing the lead screw nut 10 inside the housing 15, the opening for connecting the lead screw nut 10 and the second gear 5 to be opened on the side wall of the cylinder 18 is avoided. Therefore, a plane-to-plane contact seal is achieved between the cylinder 18 and the housing 15, reducing the production difficulty and improving the sealing performance.

[0033] The dust cover 13 is a corrugated dustproof protective sleeve that stretches or contracts as the ball screw 8 moves, thereby providing dust protection for the ball screw 8.

[0034] The housing 15 is also provided with a safety nut 20, which is sleeved on the ball screw 8 and located on one side of the screw nut 10.

[0035] In this embodiment, when the ball screw 8 retracts into the cylinder 18, the safety nut 20 installed on the side of the screw nut 10 has a self-locking thread, which increases the loosening resistance and prevents the screw nut 10 from loosening and causing a safety accident.

[0036] The motor 2 is equipped with a centrifugal brake 19, which is used to control the speed of the motor 2.

[0037] In this embodiment, in an emergency, if the actual speed exceeds the set speed of motor 2, the brake block of centrifugal brake 19 presses against the brake surface under the action of the spring, generating braking force and controlling the speed to be adjusted to the rated range.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A nut drive type electric cylinder characterized by, include: Motor (2), said motor (2) is used to transmit power; A lead screw nut (10) has teeth formed on its outer surface; A fixing assembly is connected to the lead screw nut (10) bearing, the fixing assembly being used to fix the lead screw nut (10); under the constraint of the fixing assembly, the lead screw nut (10) is only rotated; A transmission assembly for transmitting power from the motor (2) to the lead screw nut (10). A ball screw (8) is provided, and a screw nut (10) is sleeved on the ball screw (8). The screw nut (10) is used to drive the ball screw (8) to perform linear reciprocating motion. A dustproof assembly is provided inside the ball screw (8), which is used to protect the ball screw (8) from dust.

2. The nut-driven electro-hydraulic cylinder according to claim 1, characterized in that The transmission assembly includes: Helical gear (22), the helical gear (22) is provided on the output end of motor (2); The first gear (3) meshes with the helical gear (22); The second gear (5) meshes with the teeth on the outer surface of the lead screw nut (10); The flat key (4) is fitted with the first gear (3) and the second gear (5).

3. The nut-driven electro-hydraulic cylinder according to claim 2, characterized in that The transmission assembly further includes a housing (15), the transmission assembly and the ball screw nut (10) are both located inside the housing (15), the housing (15) has a first opening, a second opening and a third opening, the first opening is sealed to the motor (2), the second opening and the third opening are respectively located on the moving path of the ball screw (8), and the dustproof assembly seals the second opening and the third opening.

4. The nut-driven electro-hydraulic cylinder according to claim 3, characterized in that The dustproof component includes: Cylinder (18), the cylinder (18) being sealed to the second opening; Dust cover (13), one end of the dust cover (13) is sealed to the third opening, and the other end of the dust cover (13) is connected to one end of the ball screw (8). The dust cover (13) is soft.

5. The nut-driven electro-hydraulic cylinder according to claim 4, characterized in that One end of the ball screw (8) is connected to a rod head (21), which protrudes from the dust cover (13).

6. The nut-driven electro-hydraulic cylinder according to claim 5, characterized in that The dust cover (13) is a corrugated dustproof protective cover.

7. The nut-driven electro-hydraulic cylinder according to claim 6, characterized in that The housing (15) is also provided with a safety nut (20), which is sleeved on the ball screw (8) and is located on one side of the screw nut (10).

8. The nut-driven electro-hydraulic cylinder according to claim 7, characterized in that The motor (2) is equipped with a centrifugal brake (19), which is used to control the speed of the motor (2).

9. The nut-driven electro-hydraulic cylinder according to claim 1, characterized in that The lead screw nut (10) and the gear teeth on its outer surface are integrally formed.

10. The nut-driven electro-hydraulic cylinder according to claim 2, characterized in that The helical gear (22) and the output end of the motor (2) are integrally formed.

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