Mini electric cylinder transmission mechanism

Abstract

The utility model relates to a mini electric cylinder transmission mechanism, which adopts a trapezoidal lead screw and a trapezoidal nut for transmission, the trapezoidal lead screw has a self-locking function, the self-locking function can be kept in power failure in the use process, the self-locking requirement can be met by adopting a common servo motor, the purchase cost of the motor is reduced, and the selection diversity of the motor can be increased. The trapezoidal screw and the trapezoidal nut are adopted for transmission, compared with ball screw transmission, balls are omitted, the occupied space of the balls is saved, and therefore the piston rod can be made smaller, the trapezoidal nut is connected with the piston rod through the threads, compared with ball screw transmission, the screw locking space when a screw nut flange is fixed to the piston is saved, and therefore the size can be made smaller; the cylinder body and the trapezoidal nut are designed in a square shape and directly have a peripheral face guiding function, and the problem that the nut rotates in the using process of the ball screw is well solved; and meanwhile, the space for independently configuring a guide piece and a guide groove for preventing rotation is saved, and the internal space and the processing cost are reduced.

Description

Technical Field

[0001] The utility model relates to the field of electric cylinders, in particular to a transmission mechanism of a mini electric cylinder. Background Art

[0002] The electric cylinder is a modular product that integrates a servo motor with a lead screw. It converts the rotary motion of a servo motor into linear motion. It also transforms the servo motor's precise speed, revolutions, and torque control into precise speed, position, and thrust control, creating a revolutionary new product in the high-precision linear motion series.

[0003] Traditional electric cylinders use ball screws and screw nuts for transmission. During use, when transmitting in the vertical direction, they usually need to be equipped with a brake motor to have the power-off self-locking function.

[0004] Traditional electric cylinders use ball screws and nuts for transmission. During use, they need to be equipped with guides, which are generally manufactured and installed separately. Without guides, the piston rod will rotate together with the nut during operation.

[0005] The ball screw and ball nut used in general electric cylinders are relatively large in size due to their design and structure. In addition, there is a steel ball between the nut and the screw, which makes it impossible to reduce the size and make it miniaturized and compact. They cannot be used in places with limited space, and they cannot be lightweight.

[0006] Traditional electric cylinders need to be lubricated, either by filling them with a large amount of grease before leaving the factory or by undergoing lubrication maintenance later. They are not suitable for self-lubricating occasions or vacuum environments.

[0007] Traditional electric cylinders use external or internal travel switches to meet the control requirements of the electric cylinder. Regardless of whether the travel switch is external or internal, it takes up space. In addition, the external travel switch is easily damaged by collision during use, affecting operation. The structure is not compact, which seriously limits the appearance size and usage space of the electric cylinder, and is also expensive.

[0008] from Figure 4 and Figure 7 From the comparison, we can directly see that with the same screw diameter, the cross-sectional area of the mini electric cylinder is much smaller than that of the ordinary electric cylinder. Some models can achieve more than 50% space savings, which is very suitable for occasions with limited space and lightweight requirements. Utility Model Content

[0009] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0010] A mini electric cylinder transmission mechanism comprises a base, a square cylinder body, an end cover, an end connector, a support bearing, a trapezoidal lead screw, a trapezoidal nut, a piston rod, an upper buffer pad, a lower buffer pad, an oil-free shaft sleeve and a dust ring. A mini electric cylinder transmission mechanism, characterized in that: one end of the outer side of the base is connected to the square cylinder body, and the other end is connected to the power box; the trapezoidal screw is connected to the trapezoidal nut at the trapezoidal thread, and the power input end is connected to the inner ring of the support bearing; the outer side of the support bearing is installed on the inner side of the base; the outer side of the trapezoidal nut is connected to the piston rod by a thread; the lower buffer pad is sleeved on the trapezoidal screw and installed between the end face of the base and the end face of the trapezoidal nut; the upper buffer pad is sleeved into the outer diameter of the piston rod and installed between the end face of the trapezoidal nut and the end face of the end cover; the other end of the piston rod is connected to the end connector, and the outer diameter of the piston rod is inserted into the oil-free sleeve and the dust ring, and can be telescopically operated in the oil-free sleeve and the dust ring; the outer ring of the oil-free sleeve is installed on the inner side of the end cover; the outer ring of the dust ring is installed on the inner side of the end cover, located at the front end of the oil-free sleeve installation position.

[0011] Furthermore, the described transmission adopts a trapezoidal screw and a trapezoidal nut, and the trapezoidal screw has a self-locking function, which can solve the problem of maintaining the self-locking function when the power is cut off during use. An ordinary servo motor can meet the self-locking function, reducing the motor procurement cost and increasing the diversity of motor selection.

[0012] Furthermore, the transmission using a trapezoidal screw and a trapezoidal nut omits the balls compared to the ball screw transmission, thus saving the space occupied by the balls and thus being able to be made smaller.

[0013] Furthermore, the trapezoidal nut is threadedly connected to the piston rod. Compared to ball screw transmissions, this saves space for screw locking when the screw nut flange is fixed to the piston, thus enabling a smaller size. Furthermore, the piston rod is directly connected to the nut, eliminating the need for mounting bolts, thus reducing costs and improving efficiency.

[0014] Furthermore, the cylinder body and trapezoidal nut are designed in a square shape, which directly has the function of guiding on all four sides, and effectively solves the problem of nut rotation during the use of the ball screw; at the same time, it also saves the space for separately configuring guide parts and guide grooves to prevent rotation, reducing internal space and processing costs.

[0015] Furthermore, the trapezoidal nut is made of self-lubricating materials, such as copper or self-lubricating engineering plastics, which can avoid large friction caused by surface friction and is suitable for maintenance-free environments, including vacuum environments.

[0016] Furthermore, the external or built-in travel switch is eliminated, and the travel control is achieved by adding upper / lower buffer pads and coordinating the torque setting of the servo motor driver to stop and rotate overload, which saves space and makes the structure more compact.

[0017] The purpose of this utility model is to provide a mini electric cylinder transmission mechanism to solve the above problems, which has the following advantages:

[0018] 1. The aforementioned transmission adopts a trapezoidal screw and a trapezoidal nut. The trapezoidal screw has a self-locking function, which can solve the problem of maintaining the self-locking function when the power is cut off during use. An ordinary servo motor can meet the self-locking function, reducing the motor procurement cost and increasing the diversity of motor selection.

[0019] 2. The aforementioned transmission using a trapezoidal screw and a trapezoidal nut omits the balls compared to the ball screw transmission, thus saving the space occupied by the balls and thus being able to be made smaller.

[0020] 3. The trapezoidal nut is connected to the piston rod through a thread. Compared with the ball screw transmission, it saves the space for screw locking when the screw nut flange is fixed to the piston, so the size can be made smaller.

[0021] 4. The cylinder body and trapezoidal nut are designed in a square shape, which directly has the function of guiding on all four sides, and effectively solves the problem of nut rotation during the use of the ball screw; at the same time, it also saves the space for separately configuring guide parts and guide grooves to prevent rotation, reduces internal space and processing costs, as well as the number of parts and assembly difficulty.

[0022] 4. The trapezoidal nut is made of self-lubricating materials, such as copper or self-lubricating engineering plastics, which can avoid large friction caused by surface friction and is suitable for maintenance-free environments, including vacuum environments.

[0023] 5. Cancel the external or built-in travel switch, and realize the travel control by adding upper / lower buffer pads and coordinating the torque setting of the servo motor driver to stop and rotate overload, saving space and making the structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 It is a three-dimensional explosion schematic diagram of the utility model;

[0026] Figure 2 It is a cross-sectional view of the utility model;

[0027] Figure 3 It is a partial cross-sectional view of the trapezoidal nut connection;

[0028] Figure 4For electric cylinder trapezoidal screw (screw outer diameter ) A schematic diagram of the assembly cross section of the transmission;

[0029] Figure 5 This is a three-dimensional exploded diagram of the electric cylinder screw transmission;

[0030] Figure 6 This is a partial cross-sectional view of the screw nut connection of the electric cylinder screw drive;

[0031] Figure 7 For electric cylinder screw drive (screw outer diameter ) assembly cross-section diagram.

[0032] Explanation of the accompanying symbols: 1. Base; 2. Square cylinder body; 3. End connection; 4. Trapezoidal nut; 5. Trapezoidal screw; 6. End cover; 7. Lower buffer pad; 8. Upper buffer pad; 9. Piston rod; 10. Support bearing; 11. Dust ring; 12. Oil-free sleeve; 13. Ball screw; 14. Support bearing; 15. Motor mounting seat; 16. Screw nut; 17. Magnet; 18. Outer shell; 19. Screw piston rod; 20. Guide; 21. Bearing seat; 22. End cover; 23. Dust ring; 24. Wear-resistant ring; 25. Ball; 26. Keyway guide; 27. Magnetic switch mounting position. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the scope of protection of the present invention.

[0034] like Figure 1-Figure 4As shown: A mini electric cylinder transmission mechanism, including a base 1, a square cylinder body 2, an end cover 6, an end connector 3, a support bearing 10, a trapezoidal screw 5, a trapezoidal nut 4, a piston rod 9, an upper buffer pad 8, a lower buffer pad 7, an oil-free sleeve 12 and a dust ring 11. One end of the outer side of the base 1 is connected to the square cylinder body 2, and the other end is connected to the power box; the trapezoidal screw 5 is connected to the trapezoidal nut 4 at the trapezoidal thread, and the power input end is connected to the inner ring of the support bearing 10; the outer side of the support bearing 10 is installed on the inner side of the base 1; the outer side of the trapezoidal nut 4 is connected to the piston rod 9 is connected by a thread; the lower buffer pad 7 is sleeved on the trapezoidal screw 5 and installed between the end face of the base 1 and the end face of the trapezoidal nut 4; the upper buffer pad 8 is sleeved into the outer diameter of the piston rod 9 and installed between the end face of the trapezoidal nut 4 and the end face of the end cover 6; the other end of the piston rod 9 is connected to the end connector 3, and the outer diameter of the piston rod 9 is inserted into the oil-free sleeve 12 and the dust ring 11, and can be telescopically operated in the oil-free sleeve 12 and the dust ring 11; the outer ring of the oil-free sleeve 12 is installed on the inner side of the end cover 6; the outer ring of the dust ring 11 is installed on the inner side of the end cover 6, located at the front end of the oil-free sleeve 12 installation position.

[0035] The square cylinder body 2 adopts a square design and is extruded in one step, has a high surface roughness, and can solve the rotation problem caused by the circular guide used in the traditional electric cylinder transmission.

[0036] The trapezoidal nut 4 is designed with a square shape, matched with the inner wall of the square cylinder body 2, and adopts four-sided guidance to make the guidance during the transmission process more accurate and more stable.

[0037] The trapezoidal nut 4 is made of copper, which can ensure self-lubrication during use.

[0038] The upper buffer pad 8 and the lower buffer pad 7 can avoid direct collision at the two limit positions during the transmission process, thereby reducing damage to components and shortening their service life.

[0039] The trapezoidal lead screw 5 has a self-locking function, which can solve the problem that the traditional ball screw is configured with a brake-free motor and has no holding function when the power is cut off during the transmission process.

[0040] The trapezoidal nut 4 and the square cylinder body 2 are designed with reasonable dimensions, have small external dimensions, and are suitable for spaces that cannot be used by traditional electric cylinders.

[0041] The mini electric cylinder transmission mechanism eliminates the travel switch, reduces the overall size, and can meet the needs of space requirements, high speed and low load.

[0042] Although the present invention has been illustrated and described with reference to preferred embodiments, it should be understood by those skilled in the art that various changes in form and details of the externally threaded roller high-speed rod end joint bearing may be made within the scope of the claims.

Claims

1. A mini electric cylinder transmission mechanism, comprising a base, a square cylinder body, an end cover, an end connector, a support bearing, a trapezoidal lead screw, a trapezoidal nut, a piston rod, an upper buffer pad, a lower buffer pad, an oil-free sleeve, and a dust ring, characterized in that: One end of the inner side of the base is connected to the square cylinder body, and the other end is connected to the power box or other components; the trapezoidal screw is connected to the trapezoidal nut at the trapezoidal thread, and the power input end is matched with the inner ring of the support bearing; the outer side of the support bearing is installed on the inner side of the base; the outer side of the trapezoidal nut is connected to the piston rod through a thread; the lower buffer pad is sleeved on the trapezoidal screw and installed between the end face of the base and the end face of the trapezoidal nut; the upper buffer pad is sleeved into the outer diameter of the piston rod and installed between the end face of the trapezoidal nut and the end face of the end cover; the other end of the piston rod is connected to the end connector, and the outer diameter of the piston rod is inserted into the oil-free sleeve and dust ring, and can be telescopically operated in the oil-free sleeve and dust ring; the outer ring of the oil-free sleeve is installed on the inner side of the end cover; the outer ring of the dust ring is installed on the inner side of the end cover, located at the front end of the oil-free sleeve installation position.

2. The mini electric cylinder transmission mechanism according to claim 1, characterized in that: The trapezoidal screw and trapezoidal nut are used for transmission. The trapezoidal screw has a self-locking function, which can solve the problem of maintaining the self-locking function when the power is cut off during use. An ordinary servo motor can meet the self-locking function, reducing the motor procurement cost and increasing the diversity of motor selection.

3. The mini electric cylinder transmission mechanism according to claim 1, characterized in that: Compared with ball screw transmission, the trapezoidal screw and trapezoidal nut transmission is adopted, because the balls are omitted, which saves the space occupied by the balls and can therefore be made smaller.

4. The mini electric cylinder transmission mechanism according to claim 1, characterized in that: The trapezoidal nut is connected to the piston rod via a thread, which saves space for screw locking when the screw nut flange is fixed to the piston compared to a ball screw transmission, so the size can be made smaller.

5. The mini electric cylinder transmission mechanism according to claim 1, characterized in that: The cylinder body and trapezoidal nut are designed in a square shape, which directly has a four-sided guiding function, effectively solving the problem of nut rotation during the use of the ball screw; at the same time, it also saves the space for separately configuring guide parts and guide grooves to prevent rotation, reducing internal space and processing costs, as well as the number of parts and assembly difficulty.

6. The mini electric cylinder transmission mechanism according to claim 1, characterized in that: The trapezoidal nut is made of self-lubricating material, which can avoid large friction caused by surface friction and is suitable for maintenance-free environments, including vacuum environments.

7. The mini electric cylinder transmission mechanism according to claim 1, characterized in that: No external or internal travel switch is provided. The travel control is realized by adding upper and lower buffer pads and coordinating the torque setting of the servo motor driver to stop and rotate overload, which saves space and makes the structure more compact.

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