A servo electric cylinder with controllable gear shifting and speed change

Abstract

The present invention relates to the field of servo electric cylinders, and specifically to a servo electric cylinder with controllable gear shifting and speed change, comprising an electric cylinder sub-frame and a drive motor connected to its side wall, a plurality of speed change gear sets are provided in the inner cavity of the frame, and the two ends of the central transmission shaft are respectively connected to the output shaft of the drive motor and the inner side wall of the frame, and the inner cavity is also provided with a partition. The device abandons complex components such as traditional synchronizers, and uses a simple mechanical transmission link to reduce contact points and vulnerable parts, thereby reducing the probability of failure; short-path power transmission reduces energy loss and speeds up gear shifting response; the planetary gear load-sharing design of the speed change gear set is combined with the double-sided support of the driven wheel to disperse the load, suppress radial runout, and enhance stability; the multi-stage speed change gear set realizes a wide range of speed regulation from low speed and high torque to high speed and low torque, meets diverse working conditions, improves versatility, and solves the problems of large power loss, slow gear shifting, high failure rate, poor applicability and insufficient stability of traditional servo electric cylinders.

Description

Technical Field

[0001] The present invention relates to the field of servo electric cylinders, and in particular to a servo electric cylinder with controllable gear shifting and speed change. Background Art

[0002] A servo electric cylinder with application number CN201210457981.3 mainly includes a servo motor, a transmission mechanism, and a cylinder structure. The cylinder structure is composed of a front end plate, a rear end plate and a barrel placed therebetween. A screw and a movable nut are provided at the central axis position of the cylinder structure. The movable nut is sleeved on the screw and placed on the nut seat. A guide structure is provided between the nut seat and the inner wall of the barrel along the screw axis direction; the transmission mechanism connects the servo motor and the cylinder respectively, and the transmission mechanism is a gear transmission, including a driving wheel and a driven wheel, and one or more idler wheels can be provided between the driving wheel and the driven wheel; the barrel in the cylinder structure is a steel barrel, and the synchronous belt drive is replaced by a gear drive, which greatly improves its load-bearing capacity. In addition, the barrel is replaced by a steel barrel from an aluminum alloy barrel, which further improves its load-bearing strength.

[0003] Among the existing technologies including the above-mentioned patents, traditional servo electric cylinders mostly use complex mechanical structures such as synchronizers to achieve gear shifting. Not only do they have problems such as large power transmission loss and slow gear shifting response, but a large number of mechanical contact points can easily lead to component wear and a high failure rate. The single transmission ratio design is difficult to meet the diverse working conditions such as low-speed high-precision positioning and high-speed driving, and the versatility of the equipment is limited. The traditional structure has deficiencies in gear load distribution and stability control, and vibration and radial runout are prone to occur during operation, further reducing the reliability of the equipment.

[0004] Therefore, it is necessary to invent a servo electric cylinder with controllable gear shifting and speed change to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a servo electric cylinder with controllable gear shifting, which realizes a wide range of speed regulation from low speed and high torque to high speed and low torque through a multi-stage speed-changing gear set, meets diverse working conditions, improves versatility, and solves the problems of traditional servo electric cylinders such as large power loss, slow gear shifting, high failure rate, poor applicability and insufficient stability.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A servo electric cylinder with controllable gear shifting and speed change comprises an electric cylinder sub-frame and a drive motor, the drive motor being connected to the side wall of the electric cylinder sub-frame, the inner cavity of the electric cylinder sub-frame being provided with a plurality of speed-changing gear sets, a transmission shaft being provided at the center of the speed-changing gear set, one end of the transmission shaft being connected to the power output shaft of the drive motor, and the other end of the transmission shaft being rotatably connected to the inner side wall of the electric cylinder sub-frame; a partition being provided in the inner cavity of the electric cylinder sub-frame; a mounting frame being provided on the side wall of the electric cylinder sub-frame, a clutch indicator being provided at the top of the mounting frame, the top of the clutch indicator being rotatably connected to the drive shaft, a transmission swing arm being provided at the bottom end of the drive shaft, one end of the transmission swing arm being hinged to a transmission connecting rod, the other end of the transmission connecting rod being transmission-connected to a telescopic push rod; a telescopic push rod being telescopically inserted into the inner cavity of the electric cylinder sub-frame, one end of the telescopic push rod slidingly passing through the partition, a transmission gear being provided on the telescopic push rod that meshes with the speed-changing gear set, and a driven wheel being meshed with the other side of the transmission gear.

[0008] As a preferred solution of the present invention, one end of the driven wheel is rotatably connected to the inner side wall of the electric cylinder sub-frame, and the other end of the driven wheel is transmission-connected to the actuator piston rod.

[0009] As a preferred solution of the present invention, as a preferred solution of the present invention, the speed change gear set includes a central gear, the central gear is connected to the outer wall of the transmission shaft, the outer side of the central gear is meshed with multiple planetary gears, the outer sides of the multiple planetary gears are commonly meshed with outer ring gears, and the outer ring gear is meshed with the transmission gear.

[0010] As a preferred solution of the present invention, the central gears and planetary gears in the inner cavities of the plurality of speed change gear sets have different sizes.

[0011] As a preferred solution of the present invention, the clutch indicator is retractably provided with a plurality of indicator rods, the top of the indicator rods is provided with an indicator light, the bottom end of the indicator rods is provided with a positioning end head, the bottom end of the positioning end head is provided with two electrode conductors, a gasket is sleeved on the side wall of the bottom end of the positioning end head, the top of the gasket is provided with a plurality of springs, and the other ends of the plurality of springs are connected to the bottom end of the clutch indicator.

[0012] As a preferred solution of the present invention, an arcuate groove is provided at the top of the transmission swing arm, an oblique cut is provided on one side of the arcuate groove, and a positioning groove is provided at the center of the inner bottom wall of the arcuate groove for snap-fitting with the positioning end head.

[0013] As a preferred solution of the present invention, the other end of the electrode lead is electrically connected to an external controller via a wire.

[0014] As a preferred solution of the present invention, a metal block is provided at the center of the inner cavity of the positioning groove at the bottom end of the transmission swing arm, and the metal block is in intermittent contact with the electrode conductor.

[0015] In the above technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows:

[0016] 1. In the servo electric cylinder with controllable gear shifting, the speed change gear set, the transmission gear and the driven wheel realize gear switching through gear meshing and linkage. The transmission swing arm drives the transmission connecting rod to pull the transmission gear to move, meshing with different outer ring gears to change the transmission ratio. This device uses a simple mechanical transmission to replace complex components, and reduces power loss and shortens the gear shift response time; the planetary gear load-balancing design and the double-sided support of the driven wheel improve stability. The multi-stage speed change gear set also broadens the speed regulation range, improves the stability and strong applicability of the equipment. This device abandons complex components such as synchronizers in traditional equipment and adopts a simple mechanical transmission link to reduce mechanical connections. The number of contacts and vulnerable parts reduces the probability of equipment failure. The short-path power transmission design significantly reduces energy loss and shortens gear shift response time. The speed change gear set adopts a planetary gear load-sharing design to evenly distribute the load to multiple planetary gears to avoid single-point stress concentration. Combined with the double-sided support structure of the driven wheel, it effectively suppresses radial runout during gear meshing and enhances stability. The multi-stage speed change gear set can provide a wide speed regulation range from low speed and high torque to high speed and low torque, meeting the diverse working conditions from precise positioning to fast driving, improving the versatility of the equipment and truly achieving the organic unity of high precision, high efficiency and strong applicability.

[0017] 2. The clutch indicator uses a dual mechanism of mechanical positioning and circuit feedback to ensure accurate and stable shifting of the servo electric cylinder. Its positioning end is preloaded by the spring. When it rotates with the transmission swing arm, the oblique cut guides the end to slide into the arc groove. When the end is aligned with the positioning groove, the bottom electrode guide contacts the metal block to conduct the circuit, and the indicator light lights up. This process can accurately locate the shift position of the transmission gear in real time with a small error range, and can warn the operator through visual light signals whether the shift is in place, avoiding equipment wear, operation jams and even failures due to inaccurate gear meshing, effectively improving the safety and reliability of equipment operation, while simplifying the manual judgment process and reducing operational errors. Risk; the electrode guide at the bottom of the positioning end contacts the metal block in the positioning slot, forming a circuit connection, and the indicator light lights up; this feedback mechanism can not only intuitively display whether the gear shift is in place, but more importantly, through the dual confirmation of mechanical positioning and circuit signals, it ensures that the error of each movement of the transmission gear is small. Compared with traditional equipment that relies on manual experience or a single mechanical limit, this structure effectively avoids transmission failure, increased wear and other problems caused by gear meshing misalignment, so that the equipment can still maintain stable operation under frequent gear shifting conditions, improve the processing accuracy and service life of the equipment, and reduce maintenance costs and downtime risks. It is especially suitable for automated production scenarios with strict precision requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0020] Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 1 ;

[0021] Figure 3 Schematic diagram of the three-dimensional structure of the present invention Figure 2 ;

[0022] Figure 4 It is a cross-sectional structural diagram of the clutch schematic of the present invention;

[0023] Figure 5 This is a schematic diagram of the internal cross-sectional structure of the head-end speed-changing gear set of the present invention;

[0024] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the tail-end speed change gear set of the present invention;

[0025] Figure 7Schematic diagram of the electrode lead structure of the present invention;

[0026] Figure 8 This is a schematic structural diagram of the connection relationship between the transmission swing arm and the transmission connecting rod of the present invention;

[0027] Figure 9 This is a schematic diagram of the positioning groove structure of the present invention;

[0028] Figure 10 It is a schematic diagram of the drive shaft structure of the present invention.

[0029] Description of reference numerals:

[0030] 01. Drive shaft; 1. Electric cylinder sub-frame; 2. Drive motor; 3. Speed ​​change gear set; 4. Telescopic push rod; 5. Transmission gear; 6. Driven wheel; 7. Actuator piston rod; 11. Mounting frame; 12. Clutch indicator; 13. Drive shaft; 14. Transmission swing arm; 15. Transmission connecting rod; 31. Center gear; 32. Planetary gear; 33. Outer ring gear; 121. Indicator rod; 122. Positioning end; 123. Gasket. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] The present invention provides Figures 1-10 The servo electric cylinder with controllable gear shifting shown in the figure includes an electric cylinder sub-frame 1 and a drive motor 2. The drive motor 2 is connected to the side wall of the electric cylinder sub-frame 1. The inner cavity of the electric cylinder sub-frame 1 is provided with multiple speed-changing gear sets 3. The center of the speed-changing gear set 3 is provided with a transmission shaft 01. One end of the transmission shaft 01 is connected to the power output shaft of the drive motor 2, and the other end of the transmission shaft 01 is rotatably connected to the inner wall of the electric cylinder sub-frame 1; the inner cavity of the electric cylinder sub-frame 1 is provided with a partition; a mounting frame 11 is provided on the side wall of the electric cylinder sub-frame 1, and a clutch indicator 12 is provided at the top of the mounting frame 11. The top of the clutch indicator 12 is rotatably connected to the drive shaft 13, driving A transmission swing arm 14 is provided at the bottom end of the shaft 13, and a transmission connecting rod 15 is hinged at one end of the transmission swing arm 14, and the other end of the transmission connecting rod 15 is transmission-connected to the telescopic push rod 4; the inner cavity of the electric cylinder sub-frame 1 is telescopically plugged with a telescopic push rod 4, and one end of the telescopic push rod 4 slides through the partition, and the telescopic push rod 4 is provided with a transmission gear 5 meshing with the speed gear set 3, and a driven wheel 6 is meshed on the other side of the transmission gear 5; through the cooperation of multiple sets of speed gear sets 3 and the transmission gear 5, multi-stage speed adjustment can be achieved, thereby enhancing the adaptability range of the electric cylinder output torque and speed; the setting of the partition effectively isolates the power transmission area and the execution area, reduces vibration interference, and improves operational stability.

[0033] Furthermore, one end of the driven wheel 6 is rotatably connected to the inner wall of the electric cylinder subframe 1, and the other end of the driven wheel 6 is drivingly connected to the actuator piston rod 7. The double-sided support structure of the driven wheel 6 ensures transmission stability, reduces radial runout during gear meshing, and prolongs the gear life. The actuator piston rod 7 has high linear transmission efficiency and can accurately control load displacement.

[0034] Furthermore, the speed change gear set 3 includes a central gear 31 connected to the outer wall of the transmission shaft 01. Multiple planetary gears 32 are meshed on the outer side of the central gear 31. These planetary gears 32 are meshed with an outer ring gear 33, which meshes with the transmission gear 5. The structure of the planetary gears 32 enables high-speed transmission and even load distribution, significantly improving the gear set's load-bearing capacity. The multiple gear meshing paths increase transmission redundancy, maintaining basic transmission functionality even if individual gears wear out.

[0035] Furthermore, the central gear 31 and planetary gears 32 within the multiple speed-changing gear sets 3 are of varying sizes. This differentiated size design allows each speed-changing gear set 3 to have a unique transmission ratio. By switching between different gear sets, a wider speed regulation range can be achieved, meeting diverse operating requirements from micro-speed positioning to high-speed driving.

[0036] Furthermore, the clutch indicator 12 is retractably provided with multiple indicator rods 121. The top of the indicator rods 121 is provided with an indicator light. The bottom of the indicator rods 121 is provided with a positioning terminal 122. The bottom end of the positioning terminal 122 is provided with two electrode conductors. A backing ring 123 is sleeved on the side wall of the bottom end of the positioning terminal 122. The top of the backing ring 123 is provided with multiple springs, and the other ends of the multiple springs are connected to the bottom end of the clutch indicator 12. The spring-preloaded positioning terminal 122 enables rapid clutch response, and when the positioning groove and the terminal are aligned, the position is immediately completed. The visual feedback of the indicator light allows the operator to grasp the shift status in real time, reducing the risk of misoperation.

[0037] Furthermore, the top of the transmission swing arm 14 is provided with an arcuate groove, one side of which is provided with an oblique cut. A positioning groove is provided at the center of the inner bottom wall of the arcuate groove, which engages with the positioning end 122. The guiding effect of the oblique cut ensures that the positioning end 122 can enter the arcuate groove smoothly, avoiding wear caused by rigid collision. The provision of the positioning groove ensures that the error in the position of the transmission swing arm 14 is reduced each time it stops, ensuring shifting accuracy.

[0038] Furthermore, the other end of the electrode lead is electrically connected to an external controller via a wire. Through circuit signal feedback, the controller automatically identifies the current gear position and implements closed-loop control, automating the shifting process. This gear position information can also be uploaded to a remote monitoring system for easier equipment cluster management.

[0039] Furthermore, a metal block is positioned in the center of the positioning slot at the bottom of the transmission swing arm 14, intermittently contacting the electrode conductor. This contact-based signal transmission method offers strong anti-interference capabilities and reduces signal transmission latency compared to wireless transmission solutions, ensuring real-time response to shift commands. The intermittent contact design also prevents electrode oxidation caused by continuous power flow, extending its service life.

[0040] Working principle:

[0041] First, the driving principle is as follows: the drive motor 2 is started, and the power output shaft of the drive motor 2 drives the speed change gear set 3 to rotate. When the speed change gear set 3 rotates, it can drive the transmission gear 5 and the driven wheel 6 to rotate. The rotation of the driven wheel 6 can drive the actuator piston rod 7 to perform telescopic movement;

[0042] Second, when high-precision low-speed motion is required, first, after the equipment is installed and fixed, ensure that the output shaft of the external driving device is inserted into the hexagonal groove of the driving shaft 13, and the driving shaft 13 is driven to rotate by the external driving device. When the driving shaft 13 rotates, the transmission swing arm 14 is driven to rotate by the driving shaft 13; when the transmission swing arm 14 rotates, the spring on the washer 123 pushes the washer 123 and the positioning end 122 and the indicator rod 121 to move toward the direction of the transmission swing arm 14 at the same time. At this time, the positioning end 122 conflicts with the oblique cut on the transmission swing arm 14, and is guided by the inclination of the oblique cut, so that the positioning end 122 contracts and conflicts with the inner bottom wall of the arc groove. At this time, the positioning end 12 2 slides on the inner bottom wall of the arc groove. When it is consistent with the position of the positioning groove, the spring pushes the electrode conductor at the bottom end of the positioning end head 122 to contact the metal block. At this time, the current is transmitted through the metal block. At this time, the electrode conductor circuit is connected, and the indicator light at the top of the indicator rod 121 lights up. When the indicator light is on, it means that the rotation distance is exactly the distance that the transmission gear 5 slides from the bottom end of one outer ring gear 33 to the bottom end of the other outer ring gear 33. This ensures that the adjustment process is stable when the position of the transmission gear 5 is adjusted, enhances the stability and smoothness of the gear shift, and improves the accuracy of the meshing of the transmission gear 5 and the speed change gear set 3 when shifting;

[0043] Third, when the transmission swing arm 14 rotates, one end of the transmission connecting rod 15 is driven to perform circular motion. In conjunction with the hinged connection, the other end of the transmission connecting rod 15 pulls the transmission gear 5 connected thereto to move horizontally. Through the horizontal movement of the transmission gear 5, it can be ensured that when the gear needs to be changed, the transmission gear 5 can be pulled to rotate by rotating the transmission swing arm 14 to switch the gear. This structure is simple and can provide highly efficient gear switching adjustment.

[0044] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A servo electric cylinder with controllable gear shifting and speed change, characterized by: The electric cylinder sub-frame (1) comprises an electric cylinder sub-frame and a driving motor (2), wherein the driving motor (2) is connected to the side wall of the electric cylinder sub-frame (1), a plurality of speed change gear sets (3) are provided in the inner cavity of the electric cylinder sub-frame (1), a transmission shaft (01) is provided at the center of the speed change gear set (3), one end of the transmission shaft (01) is connected to the power output shaft of the driving motor (2), and the other end of the transmission shaft (01) is rotatably connected to the inner side wall of the electric cylinder sub-frame (1); The inner cavity of the electric cylinder sub-frame (1) is provided with a partition; A mounting frame (11) is provided on the side wall of the electric cylinder sub-frame (1), a clutch indicator (12) is provided at the top of the mounting frame (11), a driving shaft (13) is rotatably connected to the top of the clutch indicator (12), a transmission swing arm (14) is provided at the bottom end of the driving shaft (13), a transmission connecting rod (15) is hinged at one end of the transmission swing arm (14), and the other end of the transmission connecting rod (15) is transmission-connected to the telescopic push rod (4); A telescopic push rod (4) is telescopically inserted into the inner cavity of the electric cylinder sub-frame (1), one end of the telescopic push rod (4) is slidably inserted through the partition, and a transmission gear (5) meshing with the speed change gear set (3) is provided on the telescopic push rod (4), and a driven wheel (6) is meshed with the other side of the transmission gear (5).

2. The controllable shifting and speed-changing servo electric cylinder according to claim 1, characterized in that: One end of the driven wheel (6) is rotatably connected to the inner side wall of the electric cylinder sub-frame (1), and the other end of the driven wheel (6) is transmission-connected to the actuator piston rod (7).

3. The controllable shifting and speed-changing servo electric cylinder according to claim 1, characterized in that: The speed change gear set (3) includes a central gear (31), the central gear (31) is connected to the outer wall of the transmission shaft (01), the outer side of the central gear (31) is meshed with a plurality of planetary gears (32), the outer sides of the plurality of planetary gears (32) are commonly meshed with an outer ring gear (33), and the outer ring gear (33) is meshed with the transmission gear (5).

4. The controllable shifting and speed-changing servo electric cylinder according to claim 3, characterized in that: The central gears (31) and the planetary gears (32) in the inner cavities of the plurality of speed change gear sets (3) are of different sizes.

5. The controllable shifting and speed-changing servo electric cylinder according to claim 1, characterized in that: The clutch indicator (12) is retractably provided with a plurality of indicator rods (121), the top end of the indicator rods (121) is provided with an indicator light, the bottom end of the indicator rods (121) is provided with a positioning terminal (122), the bottom end of the positioning terminal (122) is provided with two electrode conductors, a gasket (123) is sleeved on the side wall of the bottom end of the positioning terminal (122), the top end of the gasket (123) is provided with a plurality of springs, and the other ends of the plurality of springs are connected to the bottom end of the clutch indicator (12).

6. The controllable shifting and speed-changing servo electric cylinder according to claim 1, characterized in that: An arcuate groove is provided at the top end of the transmission swing arm (14), an oblique cut is provided on one side of the arcuate groove, and a positioning groove for engaging with the positioning end head (122) is provided at the center of the inner bottom wall of the arcuate groove.

7. The controllable shifting and speed-changing servo electric cylinder according to claim 5, characterized in that: The other end of the electrode lead is electrically connected to an external controller via a wire.

8. The controllable shifting and speed-changing servo electric cylinder according to claim 7, characterized in that: A metal block is provided at the center of the inner cavity of the positioning groove at the bottom end of the transmission swing arm (14), and the metal block is in intermittent contact with the electrode conductor.

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