A small push electric cylinder with a hand crank mechanism

Abstract

This utility model relates to the field of small-thrust electric cylinders, and in particular to a small-thrust electric cylinder with a hand-cranked mechanism. This small-thrust electric cylinder includes a motor assembly, a push rod assembly, and a bevel gear housing between them. The bevel gear housing houses a bevel gear transmission group. The motor assembly includes a motor, and the motor output shaft is connected to an adapter shaft. The push rod assembly includes a ball screw, with a screw nut fitted over the ball screw. The bevel gear transmission group includes bevel gear I, bevel gear II, and bevel gear III. Bevel gear I is mounted on the ball screw, bevel gear II is mounted on the bevel gear housing, and bevel gear III is mounted on the adapter shaft. Bevel gear II meshes with both bevel gear I and bevel gear III. It also includes a switching mechanism for controlling the engagement or disengagement of bevel gears II and III. This utility model, through the switching mechanism of bevel gears I, II, and III, as well as the lever and return spring, achieves seamless switching between motor-driven and hand-cranked operation, accommodating both automation and emergency manual operation needs.

Description

Technical Field

[0001] This utility model relates to the field of small-thrust electric cylinder technology, and in particular to a small-thrust electric cylinder with a hand-crank device. Background Technology

[0002] As a highly integrated linear actuator, the electric cylinder's main function is to convert the rotational motion of the motor into the linear motion of the piston rod. However, because its starting and stopping are highly dependent on the reliability of the motor, it cannot be reset properly if the motor fails or a power outage occurs. Existing manual backup solutions mostly use external handles or complex clutches, which result in bulky structures and inconvenient operation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a small thrust electric cylinder with a hand-crank device. It uses bevel gear transmission to change the transmission direction and adds a hand-crank structure to achieve manual reset when the motor fails or encounters a power outage.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A small push electric cylinder with a hand-cranked device includes a motor assembly and a push rod assembly, with a bevel gear seat between the motor assembly and the push rod assembly, and a bevel gear transmission group inside the bevel gear seat; the motor assembly includes a motor, and the motor output shaft is connected to an adapter shaft; the push rod assembly includes a ball screw, with a screw nut sleeved on the ball screw, and a push rod connected to the screw nut;

[0006] The bevel gear transmission assembly includes bevel gear I, bevel gear II, and bevel gear III. Bevel gear I is mounted on a ball screw, bevel gear II is mounted on a bevel gear seat, and bevel gear III is mounted on a transfer shaft. Bevel gear II meshes perpendicularly with bevel gear I and bevel gear III, respectively.

[0007] It also includes a switching mechanism for controlling the engagement or disengagement of bevel gears II and III. The switching mechanism includes a lever for disengaging the gears and a return spring for engaging the gears. The lever is inserted into the adapter shaft and drives the adapter shaft to slide axially along the motor output shaft. The return spring is sleeved on the left side of bevel gear III.

[0008] The above technical solution achieves rapid switching between motor drive and hand crank drive through a bevel gear transmission group (bevel gear I, bevel gear II and bevel gear III) and a switching mechanism (lever + return spring).

[0009] The motor-driven (automatic) and hand-cranked (manual) operation can be freely switched to adapt to power outages or precision adjustment scenarios. The bevel gear transmission group enables power direction conversion, saving space, reducing noise, and improving transmission efficiency. A lever and return spring ensure stable engagement / disengagement of bevel gears II and III, preventing misoperation.

[0010] Furthermore, the bevel gear I is sleeved on the left end of the ball screw, and the inner wall of the bevel gear I and the outer wall of the ball screw are connected by a first flat key; a locking nut is installed on the left end of the ball screw to fix and pre-tighten the bevel gear I axially. The first flat key cooperates with the locking nut to ensure the circumferential fixation and axial pre-tightening of the bevel gear I and the ball screw, preventing transmission loosening or slippage, and improving transmission accuracy and reliability.

[0011] Furthermore, the bevel gear III is sleeved on the right end of the adapter shaft, and the adapter shaft is also provided with a first step to limit the bevel gear III. The inner wall of the bevel gear III and the outer wall of the adapter shaft are connected by a second flat key. The right end of the adapter shaft is provided with a retaining ring to limit the bevel gear III. The first step and the retaining ring provide double limiting to prevent the bevel gear III from axially loosening.

[0012] Furthermore, the bevel gear seat is equipped with a hand crank shaft, and the bevel gear II is sleeved on the end of the hand crank shaft. The hand crank shaft has a second step that limits the lower position of the bevel gear II, and a retaining spring that limits the upper position of the bevel gear II at the top of the hand crank shaft. The hand crank shaft has an inner hole for easy installation of a wrench. The inner hole is adapted to a wrench, facilitating quick tool installation during manual operation. The second step and the retaining spring prevent axial displacement of the bevel gear II.

[0013] Furthermore, it also includes an adapter flange, one end of which is connected to the bevel gear seat, and the other end of which is connected to the motor housing.

[0014] Furthermore, a linear bearing is installed on the inner wall of the adapter flange, and the adapter shaft is installed in the inner ring of the linear bearing. The adapter shaft passes through the adapter flange and extends into the bevel gear seat, with the bevel gear III fitted onto the portion of the adapter shaft extending into the bevel gear seat. One end of the return spring abuts against the adapter flange, and the other end of the return spring abuts against the bevel gear III. The linear bearing reduces the sliding friction of the adapter shaft, making it easier to operate. The return spring ensures that the bevel gear III automatically returns to its original position and engages after switching.

[0015] Furthermore, the adapter flange is provided with an oblong hole to facilitate the lever's movement of the adapter shaft; the adapter shaft is provided with an annular groove to facilitate the insertion of the lever, and a through groove is formed on the inner wall of the adapter shaft; the motor output shaft is provided with a protrusion that mates with the groove. The oblong hole limits the lever's travel, preventing excessive movement that could damage the gears. The groove and protrusion mate to ensure that the adapter shaft and the motor output shaft rotate synchronously.

[0016] Furthermore, the top cover of the waist-shaped hole is equipped with a dustproof lever plug. The lever plug is dustproof and waterproof, extending the life of the switching mechanism.

[0017] Furthermore, the bevel gear seat is equipped with a hand crank shaft seat for easy installation of the hand crank shaft. The hand crank shaft seat contains a deep groove ball bearing, which is fitted onto the hand crank shaft. A hand crank shaft cover is installed on the inner ring of the hand crank shaft seat to prevent the hand crank shaft from slipping. The deep groove ball bearing reduces hand cranking resistance and improves operating comfort.

[0018] Furthermore, the hand crank shaft cover is equipped with a waterproof outer plug for dust prevention. The waterproof outer plug further seals the operating end of the hand crank shaft, preventing moisture or impurities from entering and adapting to harsh environments such as humid and dusty conditions.

[0019] Furthermore, the hand crank shaft is provided with a third step to limit the movement of the deep groove ball bearing. The third step axially limits the deep groove ball bearing on the hand crank shaft, preventing vibration or noise caused by bearing displacement and improving the smoothness of hand cranking.

[0020] The beneficial effects of this utility model are as follows: This utility model has a simple structure and reasonable design, and has the following advantages:

[0021] (1) Seamless switching between motor drive and hand crank drive is achieved through bevel gear transmission group (bevel gear I, bevel gear II and bevel gear III) and switching mechanism (lever + return spring), taking into account both automation and emergency manual operation needs;

[0022] (2) The design of three bevel gears vertical transmission and ball screw conversion takes into account both small thrust requirements and high transmission efficiency, with a compact structure and low noise.

[0023] (3) The structure of the hand crank shaft inner hole and the lever waist-shaped hole reduces the difficulty of operation and improves the convenience of maintenance. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a structural diagram of the present invention in normal working condition;

[0026] Figure 2 yes Figure 1 A sectional view;

[0027] Figure 3This is a schematic diagram of the structure of this utility model in its hand-cranked state;

[0028] Figure 4 This is a schematic diagram of the adapter shaft;

[0029] Figure 5 yes Figure 4 The left view;

[0030] Figure 6 This is a schematic diagram of the hand crank shaft;

[0031] Figure 7 yes Figure 6 The left view;

[0032] Figure 8 This is a schematic diagram of the structure of bevel gear I;

[0033] Figure 9 yes Figure 8 A sectional view;

[0034] Figure 10 This is a structural schematic diagram of bevel gear II;

[0035] Figure 11 yes Figure 10 A sectional view;

[0036] Figure 12 This is a structural schematic diagram of bevel gear III;

[0037] Figure 13 yes Figure 12 A sectional view.

[0038] In the diagram: 1. Ball screw, 2. First flat key, 3. Bevel gear I, 4. Locking nut, 5. Bevel gear seat, 6. Snap ring, 7. Bevel gear III, 8. Return spring, 9. Adapter shaft, 10. Pulley plug, 11. Pulley, 12. Adapter flange, 13. Linear bearing, 14. Motor, 15. Bevel gear II, 16. Hand crank shaft seat, 17. Deep groove ball bearing, 18. Hand crank shaft cover, 19. Hand crank shaft, 20. Waterproof outer plug, 21. Push rod, 22. Annular groove, 23. First step, 24. Groove, 25. Second step, 26. Inner hole, 27. Third step, 28. First mounting part, 29. First groove, 30. Second mounting part, 31. Second groove, 32. Third mounting part, 33. Third groove. Detailed Implementation

[0039] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] Example 1

[0043] like Figures 1 to 7 The small push-force electric cylinder shown has a hand-cranked mechanism, comprising a motor assembly and a push rod assembly. A bevel gear seat 5 is provided between the motor assembly and the push rod assembly, and a bevel gear transmission assembly is provided inside the bevel gear seat 5. The motor assembly includes a motor 14, and the output shaft of the motor 14 is connected to a converter shaft 9. The push rod assembly includes a ball screw 1, with a screw nut sleeved on the ball screw 1, and a push rod 21 connected to the screw nut. The bevel gear transmission assembly includes bevel gear I3, bevel gear II15, and bevel gear III7. Bevel gear I3 is mounted on the ball screw 1, bevel gear II15 is mounted on the bevel gear seat 5, and bevel gear III7 is mounted on the converter shaft 9. Bevel gear II15 meshes with bevel gear I3 and bevel gear III7 respectively. Bevel gear II15 is installed and connected to the hand-cranked shaft 19. Bevel gear III7 is installed and connected to the converter shaft 9.

[0044] This small push-type electric cylinder with a hand-crank mechanism also includes a switching mechanism for controlling the engagement or disengagement of bevel gears II15 and III7. The switching mechanism includes a lever 11 for disengagement and a return spring 8 for engagement. The lever 11 is inserted into the adapter shaft 9 and drives the adapter shaft 9 to slide axially along the output shaft of the motor 14. The return spring 8 is sleeved on the left side of bevel gear III7. All three bevel gears are helical bevel gears.

[0045] This small thrust electric cylinder with a hand-cranked device also includes an adapter flange 12. One end of the adapter flange 12 is connected to the bevel gear seat 5 by bolts, and the other end of the adapter flange 12 is connected to the motor housing 14 by bolts. The other end of the bevel gear seat 5 is connected to the push rod assembly.

[0046] A hand crank shaft 19 is provided on the bevel gear seat 5. Bevel gear II 15 is sleeved on the end of the hand crank shaft 19. The hand crank shaft 19 has a second step 25 that limits the lower position of bevel gear II 15, and a retaining ring 6 that limits the upper position of bevel gear II 15 at its top. The hand crank shaft 19 has an inner hole 26 for easy wrench installation; the inner hole 26 is a hexagonal hole. The inner wall of bevel gear II 15 and the outer wall of the hand crank shaft 19 are connected by a third flat key (not shown in the figure). The retaining ring 6 engages with the second step 25 to ensure the bevel gear II 15 is fixed to the hand crank shaft 19, preventing axial movement and improving transmission efficiency during manual operation.

[0047] The bevel gear I3 is sleeved on the left end of the ball screw 1. The inner wall of the bevel gear I3 and the outer wall of the ball screw 1 are connected by a first flat key 2. A locking nut 4 is threaded onto the left end of the ball screw 1 to fix and pre-tighten the bevel gear I3 axially. The first flat key 2 prevents the bevel gear I3 and the ball screw 1 from rotating relative to each other, and the locking nut 4 pre-tightens to prevent the bevel gear I3 from moving axially, thus improving the transmission accuracy.

[0048] The bevel gear III7 is fitted onto the right end of the adapter shaft 9. The adapter shaft 9 also has a first step 23 for limiting the movement of the bevel gear III7. The inner wall of the bevel gear III7 and the outer wall of the adapter shaft 9 are connected by a second flat key (not shown in the figure). A retaining ring 6 is provided at the right end of the adapter shaft 9 to limit the movement of the bevel gear III7. The first step 23 and the retaining ring 6 provide double limiting to prevent axial loosening of the bevel gear III7. The second flat key ensures that the power from the motor 14 is transmitted to the bevel gear III7.

[0049] A linear bearing 13 is installed on the inner wall of the adapter flange 12. The right end of the linear bearing 13 is positioned against the positioning step on the inner wall of the adapter flange 12, and the left end is positioned by a retaining spring. The adapter shaft 9 is installed in the inner ring of the linear bearing 13. The adapter shaft 9 passes through the adapter flange 12 and extends into the bevel gear seat 5. The portion of the adapter shaft 9 extending into the bevel gear seat 5 is fitted with a bevel gear III 7. One end of the return spring 8 abuts against the adapter flange 12, and the other end of the return spring 8 abuts against the bevel gear III 7.

[0050] The adapter flange 12 has an oblong hole for the lever 11 to move the adapter shaft 9. A dustproof lever plug 10 covers the oblong hole. The adapter shaft 9 has an annular groove 22 for the lever 11 to be inserted. A through groove 24 is formed on the inner wall of the adapter shaft 9, and a protrusion on the output shaft of the motor 14 mates with the groove 24. The output shaft of the motor 14 drives the adapter shaft 9 to rotate. When the motor 14 is not rotating, the adapter shaft 9 can move axially along the output shaft of the motor 14. The lever plug 10 seals the oblong hole to prevent dust or foreign objects from entering the adapter flange 12, extending the service life of the switching mechanism and improving the equipment's environmental adaptability.

[0051] A hand crank shaft seat 16 is bolted to the bevel gear seat 5 for easy installation of the hand crank shaft 19. The hand crank shaft seat 16 houses a deep groove ball bearing 17, which is fitted onto the hand crank shaft 19. The hand crank shaft 19 has a third step 27 that limits the positioning of the deep groove ball bearing 17. A hand crank shaft cover 18, preventing slippage of the hand crank shaft 19, is threaded onto the inner ring of the hand crank shaft seat 16. The threaded cover 18 has a waterproof outer plug 20 for dust prevention. The deep groove ball bearing 17 reduces friction during hand crank shaft rotation, improving the smoothness of manual operation; the hand crank shaft cover 18, in conjunction with the third step 27, prevents bearing slippage, ensuring accurate axial positioning of the hand crank shaft and improving transmission reliability.

[0052] like Figure 8 and Figure 9 As shown, the bevel gear I3 includes a first mounting part 28 fitted on the ball screw 1, and the inner wall of the bevel gear I3 is provided with a first groove 29 that mates with the first flat key 2.

[0053] like Figure 10 and Figure 11 As shown, the bevel gear II15 includes a second mounting part 30 fitted on the hand crank shaft 19, and the inner wall of the bevel gear II15 is provided with a second groove 31 that mates with the third flat key.

[0054] like Figure 12 and Figure 13 As shown, the bevel gear Ⅲ7 includes a third mounting part 32 fitted on the adapter shaft 9, and the inner wall of the bevel gear Ⅲ7 is provided with a third groove 33 that mates with the second flat key.

[0055] During normal operation, the output shaft of motor 14 rotates, driving the adapter shaft 9 to rotate. A second flat key is installed between the adapter shaft 9 and bevel gear III7, which drives the bevel gear III7 to rotate. Bevel gears I3, II15, and III7 mesh with each other and transmit torque to each other, ultimately driving the ball screw 1 to rotate through the first flat key 2, thereby controlling the action of the electric cylinder.

[0056] When motor 14 malfunctions or loses power, it cannot drive the electric cylinder. The lever plug 10 on the adapter flange 12 can be removed, and the lever 11 inserted into the annular groove 22 of the adapter shaft 9 can be moved to the left. The adapter shaft 9 will then drive the bevel gear Ⅲ7 to move to the left, disengaging the bevel gear Ⅲ7 and disengaging it from the bevel gear Ⅱ15 (e.g., Figure 3 (As shown); At this time, unscrew the waterproof outer plug 20, insert a hex wrench into the inner hole 26 of the hand crank shaft 19, and rotate the hand crank shaft 19, thereby driving the bevel gear II 15 to rotate, which in turn drives the bevel gear I 3 to rotate. This is transmitted through the ball screw 1, controlling the push rod 21 to move, thus realizing the manual control of the electric cylinder. After the manual operation is completed, remove the lever 11. Under the action of the return spring 8, the bevel gear III 7 moves to the right and re-engages with the bevel gear II 15.

[0057] In summary, the bevel gear transmission assembly (bevel gear I3, bevel gear II15, and bevel gear III7) and the switching mechanism (lever 11 + return spring 8) enable seamless switching between motor drive and hand crank drive, accommodating both automation and emergency manual operation needs. While ensuring low thrust performance, it achieves efficient and reliable dual-mode drive within a limited space, demonstrating significant practical value and market competitiveness.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A small thrust electric cylinder with a hand-cranked mechanism, characterized in that: It has a motor assembly and a push rod assembly, with a bevel gear seat (5) between the motor assembly and the push rod assembly, and a bevel gear transmission group inside the bevel gear seat (5); the motor assembly includes a motor (14), and the output shaft of the motor (14) is connected to an adapter shaft (9); the push rod assembly includes a ball screw (1), with a screw nut sleeved on the ball screw (1), and a push rod (21) connected to the screw nut; The bevel gear transmission assembly includes bevel gear I (3), bevel gear II (15) and bevel gear III (7). Bevel gear I (3) is mounted on a ball screw (1), bevel gear II (15) is mounted on a bevel gear seat (5), and bevel gear III (7) is mounted on a transfer shaft (9). Bevel gear II (15) meshes with bevel gear I (3) and bevel gear III (7) respectively. It also includes a switching mechanism for controlling the engagement or disengagement of bevel gear II (15) and bevel gear III (7). The switching mechanism includes a lever (11) for disengaging and a return spring (8) for engaging. The lever (11) is inserted into the adapter shaft (9) and the lever (11) drives the adapter shaft (9) to slide axially along the output shaft of the motor (14). The return spring (8) is sleeved on the left side of bevel gear III (7).

2. A small thrust electric cylinder with a hand-cranked device according to claim 1, characterized in that: The bevel gear I (3) is sleeved on the left end of the ball screw (1), and the inner wall of the bevel gear I (3) and the outer wall of the ball screw (1) are connected by a first flat key (2); a locking nut (4) is installed on the left end of the ball screw (1) to fix and pre-tighten the bevel gear I (3) axially.

3. A small thrust electric cylinder with a hand-cranked device according to claim 1, characterized in that: The bevel gear III (7) is sleeved on the right end of the adapter shaft (9). The adapter shaft (9) is also provided with a first step (23) for limiting the bevel gear III (7). The inner wall of the bevel gear III (7) and the outer wall of the adapter shaft (9) are connected by a second flat key. The right end of the adapter shaft (9) is provided with a retaining ring (6) for limiting the bevel gear III (7).

4. A small thrust electric cylinder with a hand-cranked device according to claim 1, characterized in that: The bevel gear seat (5) is provided with a hand crank shaft (19), the bevel gear II (15) is sleeved on the end of the hand crank shaft (19), the hand crank shaft (19) is provided with a second step (25) for lower limit of bevel gear II (15), and the top of the hand crank shaft (19) is provided with a retaining ring (6) for upper limit of bevel gear II (15); the hand crank shaft (19) is provided with an inner hole (26) for easy installation of a wrench.

5. A small thrust electric cylinder with a hand-cranked device according to claim 1, characterized in that: It also includes a transition flange (12), one end of which is connected to the bevel gear seat (5), and the other end of which is connected to the motor (14) housing.

6. A small thrust electric cylinder with a hand-cranked device according to claim 5, characterized in that: A linear bearing (13) is installed on the inner wall of the adapter flange (12), and the adapter shaft (9) is installed in the inner ring of the linear bearing (13). The adapter shaft (9) passes through the adapter flange (12) and extends into the bevel gear seat (5). The portion of the adapter shaft (9) extending into the bevel gear seat (5) is fitted with a bevel gear III (7). One end of the return spring (8) abuts against the adapter flange (12), and the other end of the return spring (8) abuts against the bevel gear III (7).

7. A small thrust electric cylinder with a hand-cranked device according to claim 5, characterized in that: The adapter flange (12) is provided with a waist-shaped hole to facilitate the lever (11) to move the adapter shaft (9); The adapter shaft (9) is provided with an annular groove (22) to facilitate the insertion of the lever (11). The inner wall of the adapter shaft (9) is provided with a groove (24) that penetrates the adapter shaft (9). The output shaft of the motor (14) is provided with a protrusion that cooperates with the groove (24).

8. A small thrust electric cylinder with a hand-cranked device according to claim 7, characterized in that: The top cover of the waist-shaped hole is equipped with a dustproof lever plug (10).

9. A small thrust electric cylinder with a hand-cranked device according to claim 5, characterized in that: The bevel gear seat (5) is equipped with a hand crank seat (16) for easy installation of the hand crank shaft (19). The hand crank seat (16) contains a deep groove ball bearing (17), which is sleeved on the hand crank shaft (19). The inner ring of the hand crank seat (16) is equipped with a hand crank cover (18) to prevent the hand crank shaft (19) from slipping.

10. A small thrust electric cylinder with a hand-cranked device according to claim 9, characterized in that: The hand crank shaft cover (18) is equipped with a waterproof outer plug (20) for dust prevention.

11. A small thrust electric cylinder with a hand-cranked device according to claim 9, characterized in that: The hand crank shaft (19) is provided with a third step (27) for limiting the deep groove ball bearing (17).

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