An electric push rod manual interface

Abstract

This invention proposes a manual interface for electric actuators, mainly comprising a manual bevel gear, a translational bevel gear, and a flexible shaft. This manual interface solves the problem of flexible arrangement of manual interfaces for electric actuators, allowing users to operate manually from a distance. In manual mode, the electric drive chain is disconnected; in electric mode, the manual drive chain is disconnected. When the electric component is functioning normally, the manual component does not rotate. This facilitates flexible arrangement, improves reliability, and extends service life. Even if the motor burns out or jams in manual mode, the manual function remains unaffected. In manual mode, the front-stage reduction gear is disconnected, eliminating the need for gear-driven speed increase to pull the motor during manual rotation, resulting in lower manual torque and easier operation. Since the manual power source speed is much lower than the motor speed, the manual bevel gear is positioned before the bidirectional backstop mechanism and after the front-stage reduction gear, achieving a suitable manual transmission ratio. This allows for better coordination between manual and electric speeds, and the manual operation features full reverse self-locking for safety and reliability.

Description

Technical Field

[0001] This invention belongs to the technical field of electromechanical linear actuators, specifically relating to a flexibly arrangable manual interface for an electric actuator. By leading out the manual interface at a suitable position on the housing, it can be extended to an easily operable location. Background Technology

[0002] Existing manual interfaces for electromechanical telescopic actuators typically come in two forms: the first is located on the housing, coaxial with a rotating shaft inside; the second involves an additional worm gear mechanism, with the manual interface located at the end of the worm. The first form suffers from the problem that the manual interface rotates continuously with the electric actuator, and its placement makes operation difficult. The second form usually requires a planetary gear transmission mechanism, with the internal gear ring fixed at the center of the worm gear. The reverse transmission and self-locking characteristics of the worm gear are used to fix the internal gear ring, and manual operation involves rotating the worm while simultaneously locking the sun gear. In the second form, the manual mechanism is complex, bulky, and costly, and the manual transmission ratio is often large due to the multiplication factor of the worm gear transmission, resulting in slow manual speeds. Summary of the Invention

[0003] (a) Technical problems to be solved This invention proposes a manual interface for electric linear actuators to solve the technical problems that the arrangement, disengagement / engagement, manual speed, and operation position of the manual interface for electric linear actuators cannot meet the requirements.

[0004] (II) Technical Solution To address the aforementioned technical problems, this invention proposes a manual interface for an electric actuator, comprising a manual bevel gear, a translational bevel gear, and a flexible shaft. The paired manual and translational bevel gears are installed between the front-stage reduction gear and the intermediate transmission mechanism of the electric actuator. The translational bevel gear can translate along a key between the output shaft of the front-stage reduction gear and the input shaft of the intermediate transmission mechanism. When it translates and engages with the input shaft of the intermediate transmission mechanism, it meshes with the manual bevel gear and disengages from the output shaft of the front-stage reduction gear, thus connecting the manual transmission and disconnecting the electric transmission chain. When the translational bevel gear translates and engages with the output shaft of the front-stage reduction gear, it completely disengages from the manual bevel gear, and the key on the output shaft of the front-stage reduction gear inserts into the keyway of the translational bevel gear, connecting the electric transmission and disconnecting the manual transmission chain.

[0005] Furthermore, the manual bevel gear is supported on the housing of the electric actuator by bearings.

[0006] Furthermore, a housing is provided on the flexible shaft to keep it in a fixed position.

[0007] Furthermore, the operating end of the flexible shaft is connected to the electric wrench.

[0008] Furthermore, the translational bevel gear is translated via a shift fork mounted on the electric actuator housing.

[0009] Furthermore, the input shaft of the intermediate transmission mechanism of the electric actuator is equipped with a spring and a ball, which cooperate with two ball slots on the translational bevel gear. When the translational bevel gear moves between the output shaft of the front reduction gear and the input shaft of the intermediate transmission mechanism, the ball is engaged in the corresponding ball slot by the spring, positioning the translational bevel gear in the engagement and disengagement position.

[0010] (III) Beneficial Effects This invention proposes a manual interface for electric actuators, mainly comprising a manual bevel gear, a translational bevel gear, and a flexible shaft. This manual interface solves the problem of flexible arrangement of manual interfaces for electric actuators, allowing users to operate manually from a distance. In manual mode, the electric drive chain is disconnected; in electric mode, the manual drive chain is disconnected. When the electric component is functioning normally, the manual component does not rotate. This facilitates flexible arrangement, improves reliability, and extends service life. Even if the motor burns out or jams in manual mode, the manual function remains unaffected. In manual mode, the front-stage reduction gear is disconnected, eliminating the need for gear-driven speed increase to pull the motor during manual rotation, resulting in lower manual torque and easier operation. Since the manual power source speed is much lower than the motor speed, the manual bevel gear is positioned before the bidirectional backstop mechanism and after the front-stage reduction gear, achieving a suitable manual transmission ratio. This allows for better coordination between manual and electric speeds, and the manual operation features full reverse self-locking for safety and reliability. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the electric actuator in this invention; Figure 2 This is a schematic diagram of the translational ball positioning structure in this invention.

[0012] In the diagram: 1-Load hinge fulcrum; 2-Push rod; 3-Lead screw; 4-Nut; 5-Bearing; 6-Box; 7-Bidirectional backstop mechanism; 8-Intermediate transmission mechanism; 9-Manual bevel gear; 10-Transfer bevel gear; 11-Pre-stage reduction gear; 12-Flexible shaft; 13-Motor; 14-Pre-stage reduction output shaft; 15-Spring; 16-Balloon; 17-Intermediate transmission input shaft; 18-Balloon slot. Detailed Implementation

[0013] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0014] This embodiment proposes a manual interface for an electric actuator, the overall structure of which is as follows: Figure 1As shown, the main components include a housing 6, a motor 13, a front-stage reduction gear 11, an intermediate transmission mechanism 8, a bidirectional backstop mechanism 7, a lead screw 3, a bearing 5, a nut 4, a push rod 2, and a load hinge point 1. The housing 6 has a cuboid structure, with the motor 13 and the load hinge point fixed externally to the housing 6. The housing 6 houses the front-stage reduction gear 11, the intermediate transmission mechanism 8, and the bearing 5. The input end of the front-stage reduction gear 11 is fixedly connected to the output shaft of the motor 13, and the output end of the front-stage reduction gear 11 is fixedly connected to the input end of the intermediate transmission mechanism 8. The output end of the intermediate transmission mechanism 8 is connected to the input end of the bidirectional backstop mechanism 7, and the output end of the bidirectional backstop mechanism 7 is fixedly connected to the rear end of the lead screw 3. The rear end of the lead screw 3 is supported by the bearing 5. A nut 4 is installed on the lead screw 3. The inner helix of the nut 4 and the outer helix of the lead screw 3 form a trapezoidal lead screw pair. The front end face of the nut 4 is fixedly connected to the rear end of the hollow push rod 2. The front end of the push rod 2 is provided with a load hinge fulcrum 1 for connecting with the load.

[0015] The manual interface of the electric actuator of the present invention includes a manual bevel gear 9, a translational bevel gear 10, and a flexible shaft 12. The manual bevel gear 9 and the translational bevel gear 10 are installed in pairs between the front reduction gear 11 and the intermediate transmission mechanism 8, directing the motion shaft to a side less prone to interference. The manual bevel gear 9, with its manual interface, is supported on the housing 6 of the electric actuator by bearings. The translational bevel gear 10 can translate along a key between the output shaft of the front reduction gear 11 and the input shaft of the intermediate transmission mechanism 8. When it translates and engages with the input shaft of the intermediate transmission mechanism 8, the translational bevel gear 10 engages with the manual bevel gear 9 and disengages from the output shaft of the front reduction gear 11, thus connecting the manual transmission and disconnecting the electric transmission chain. When switching to electric mode, when the translational bevel gear 10 translates and engages with the output shaft of the front reduction gear 11, the translational bevel gear 10 completely disengages from the manual bevel gear 9, and the key on the output shaft of the front reduction gear 11 inserts into the keyway of the translational bevel gear 10, thus connecting the electric transmission and disconnecting the manual transmission chain.

[0016] A flexible shaft 12 is connected to one end of the manual bevel gear 9 extending from the side of the housing 6, allowing the manual end to be flexibly positioned and fixed in a convenient operating space. When the transmission chain of the motor 13 is working normally, the translational bevel gear 10 moves to the output shaft of the pre-stage reduction gear 11, disengaging from the manual bevel gear 9. At this time, neither the manual bevel gear 9 nor the flexible shaft 12 rotates with the motor 13, thus allowing for easy fixing in a certain position. When manual operation is required, the translational bevel gear 10 is manually moved to the input shaft of the intermediate transmission mechanism 8, causing the translational bevel gear 10 to mesh with the bevel gear 9 and disengage from the output shaft of the pre-stage reduction gear 11. At this time, the operating end of the flexible shaft 12 can be detached and unfixed for hand operation. The flexible shaft 12 can be fitted with a housing to maintain a fixed position for manual operation. The operating end of the flexible shaft 12 can be rotated manually or connected to an electric wrench.

[0017] To control the movement of the translational bevel gear 10, a shift fork can be installed on the housing 6 for translating the bevel gear 10, and a ball-groove structure is used for locking and limiting its movement. For example... Figure 2 As shown, the intermediate transmission input shaft 17 of the intermediate transmission mechanism 8 is equipped with a spring 15 and a ball 16, which cooperate with the two ball slots 18 on the translational bevel gear 10. When the translational bevel gear 10 translates between the output shaft of the front reduction gear 11 and the input shaft of the intermediate transmission mechanism 8, the ball 16 is engaged in the corresponding ball slot 18 by the spring 15, so that the translational bevel gear 10 is reliably positioned in the meshing and disengaging position.

[0018] The manual interface of this invention is applied to the electromechanical lifting push rod of a heavy truck cab tilting design. The outer diameter is Φ68mm and the lifting stroke is 680mm. Manual operation can be easily achieved at any position during the entire stroke even if the power is cut off. The manual operation position is at the original position of the hydraulic cylinder manual lever, which is convenient, reliable and low cost.

[0019] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An electrical pushrod hand interface, characterized by, The electric push rod manual interface comprises a manual bevel gear, a translation bevel gear and a flexible shaft; the pair of manual bevel gears and translation bevel gears are installed between the front-stage reduction gear of the electric push rod and the intermediate transmission mechanism; the translation bevel gear can be translated along the flat key between the output shaft of the front-stage reduction gear and the input shaft of the intermediate transmission mechanism; when the translation bevel gear is translated and clamped to the input shaft of the intermediate transmission mechanism, the translation bevel gear can be engaged with the manual bevel gear and disengaged from the output shaft of the front-stage reduction gear, the manual transmission link is connected and the electric transmission link is disconnected; when the translation bevel gear is translated and clamped to the output shaft of the front-stage reduction gear, the translation bevel gear is completely disengaged from the manual bevel gear and the flat key on the output shaft of the front-stage reduction gear is inserted into the key groove of the translation bevel gear, the electric transmission link is connected and the manual transmission link is disconnected.

2. The electric pole hand interface of claim 1, wherein, The manual bevel gear is supported on the box of the electric push rod through a bearing.

3. The electric pole hand interface of claim 1, wherein, The flexible shaft is provided with a shell to keep the flexible shaft in a fixed position.

4. The electric pole hand interface of claim 1, wherein, The operation end of the flexible shaft is connected with the electric wrench.

5. The electric push rod manual interface of claim 1, wherein, The translation bevel gear is translated through the shift fork installed on the box of the electric push rod.

6. The electric pole hand interface of claim 1, wherein, The input shaft of the intermediate transmission mechanism of the electric push rod is provided with a spring and a marble, which are matched with the two marble clamping grooves on the translation bevel gear; when the translation bevel gear is translated between the output shaft of the front-stage reduction gear and the input shaft of the intermediate transmission mechanism, the marble is clamped into the corresponding marble clamping groove through the spring, so as to position the translation bevel gear to the engaged and disengaged positions.

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