Manual clutch release structure of electric push rod

Abstract

The invention relates to the technical field of electric push rods, and discloses an electric push rod manual clutch release structure which comprises a lead screw transmission mechanism, a driving motor and a linkage gearbox, the lead screw transmission mechanism is meshed with the driving motor through the linkage gearbox, a first outer gear is meshed with the driving motor, and a second outer gear is meshed with the lead screw transmission mechanism; the first linkage shaft and the second linkage shaft are in transmission connection through an inner gear shaft, and the inner gear shaft is connected with a separation mechanism used for disconnecting transmission of the first linkage shaft and the second linkage shaft. The inner gear shaft can be manually controlled through the separating mechanism to disconnect transmission between the first linkage shaft and the second linkage shaft, so that transmission between the driving motor and the lead screw transmission mechanism is separated, the electric push rod can still achieve the contraction action of the inner pipe under the condition of power failure, and the electric push rod is simple in structural design, reliable in work, high in practicability, suitable for application and popularization and suitable for popularization and application. The problem that the electric push rod cannot realize the contraction action of the inner pipe under the condition of power failure is solved.

Description

Technical Field

[0001] The invention relates to the technical field of electric push rods, and in particular to a manual clutch release structure of an electric push rod. Background Art

[0002] An electric linear actuator is an electric drive device that converts the rotational motion of a motor into the linear reciprocating motion of a push rod. A column-type electric linear actuator is a universal auxiliary drive device that can be used as an actuator to achieve remote control, centralized control or automatic control.

[0003] An electric push rod generally used in medical devices or household appliances includes a housing, a drive motor, a screw transmission mechanism, a travel switch, an inner tube and an outer tube. The screw transmission mechanism drives the inner tube to perform linear telescopic motion relative to the outer tube under the drive of the drive motor to achieve the pushing function.

[0004] The existing electric push rod cannot realize the inner tube retraction action when the power is off. Summary of the invention

[0005] The purpose of the present invention is to provide a manual clutch release structure for an electric push rod, aiming to solve the problem in the prior art that the electric push rod cannot achieve the inner tube contraction action when the power is off.

[0006] The present invention is implemented as follows: the manual clutch release structure of the electric push rod includes a screw transmission mechanism, a drive motor and a linkage gear box, the screw transmission mechanism is meshed with the drive motor through the linkage gear box, the linkage gear box includes a first linkage shaft and a second linkage shaft, a first external gear is arranged on the outer periphery of the first linkage shaft, the first external gear is meshed with the drive motor, a second external gear is arranged on the outer periphery of the second linkage shaft, and the second external gear is meshed with the screw transmission mechanism;

[0007] The first linkage shaft and the second linkage shaft are arranged opposite to each other longitudinally, and are connected to each other through an internal gear shaft. A separation mechanism for disconnecting the first linkage shaft from the second linkage shaft is connected to the internal gear shaft.

[0008] Furthermore, the first external gear and the second external gear are arranged longitudinally with a relative spacing, the bottom of the first linkage shaft is inserted into the top of the second linkage shaft, and the outer side wall of the first linkage shaft and the inner side wall of the second linkage shaft are arranged with a spacing;

[0009] The top of the second linkage shaft has a limiting groove formed inwardly concave, and the limiting groove is arranged in a ring shape. The bottom of the first linkage shaft is located in the limiting groove, and bearings are respectively sleeved on the outer periphery of the first linkage shaft and the outer periphery of the second linkage shaft.

[0010] Furthermore, the separation mechanism includes a wrench, a loosening end and a loosening shaft, the wrench and the loosening shaft are connected via the loosening end, and the upper and lower ends of the loosening shaft are movably abutted against the loosening end and the internal gear shaft respectively.

[0011] Furthermore, the loosening end includes a loosening upper end cover, a loosening lower end cover and a first spring, the first spring sleeve is arranged on the upper periphery of the loosening shaft, the loosening upper end cover is located above the loosening lower end cover, the loosening upper end cover and the loosening lower end cover are connected by the first spring sleeve, the wrench and the loosening lower end cover are rotatably connected by the loosening upper end cover, the loosening lower end cover and the loosening upper end cover are respectively sleeved on the upper part of the loosening shaft, and the loosening upper end cover and the loosening lower end cover are arranged longitudinally.

[0012] Further, the first linkage shaft has a first gear chute with a bottom opening, the second linkage shaft has a second gear chute with a top opening, the second gear chute and the first gear chute are enclosed to form a rotating cavity, the inner gear shaft is meshed with the rotating cavity, the inner gear shaft is connected to a second spring for driving the inner gear shaft to return to its original position, and the second spring is located in the rotating cavity;

[0013] The upper and lower ends of the inner gear shaft are respectively in movably contact with the loosening shaft and the second spring.

[0014] Furthermore, along the direction from bottom to top, a positioning shaft passes through the second linkage shaft, and the top of the positioning shaft passes through the internal gear shaft from bottom to top and is inserted into the loosening shaft.

[0015] Furthermore, the second spring is sleeved on the outer circumference of the positioning shaft.

[0016] Further, a push ring is provided on the outer periphery of the top of the positioning shaft protruding outward, and the push ring is located in the loosening shaft; the inner gear shaft has a through cavity for the positioning shaft to pass through, and the through cavity has an expansion cavity expanding outward, the diameter of the expansion cavity is larger than the diameter of the through cavity, and an annular step is formed between the bottom of the expansion cavity and the inner side wall of the through cavity, and the annular step is arranged vertically opposite to the push ring;

[0017] The bottom of the positioning shaft is exposed outside the rotating cavity, and a pull switch for driving the positioning shaft to move is connected to the bottom of the positioning shaft;

[0018] When the pull switch pulls the positioning shaft away from the release shaft, the push ring abuts against the annular step and drives the internal gear shaft to move away from the release shaft, so as to disconnect the transmission of the first linkage shaft and the second linkage shaft.

[0019] Further, the pull switch includes a movable bearing and a pull cover, wherein the movable bearing is mounted on the bottom of the positioning shaft, the pull cover is mounted on the movable bearing, a pull ring is provided on the pull cover, and a pull rope is connected to the pull ring;

[0020] The movable bearing comprises an inner ring and an outer ring, the outer ring and the inner ring are rotatably connected via a rolling ball, the inner ring is sleeved on the bottom periphery of the positioning shaft, and the pull cover is mounted on the outer ring.

[0021] Furthermore, the push ring has a push end surface facing the annular step, and a plurality of rolling balls are arranged on the push end surface, and the plurality of rolling balls are arranged at intervals along the circumference of the push end surface;

[0022] The annular step is provided with an annular groove which is recessed inwards and is arranged around the circumference of the annular step; the pushing end surface is movably abutted against the annular groove of the annular step through a rolling ball.

[0023] Compared with the prior art, the manual clutch release structure of the electric push rod provided by the present invention can manually control the internal gear shaft through the separation mechanism to disconnect the transmission of the first linkage shaft and the second linkage shaft, thereby separating the transmission between the drive motor and the screw transmission mechanism, so that the electric push rod can still achieve the contraction action of the inner tube when the power is off. The structure is simple in design, reliable in operation, and highly practical, and is suitable for popularization and use, which solves the problem that the electric push rod cannot achieve the contraction action of the inner tube when the power is off. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the manual clutch release structure of the electric push rod provided by the present invention;

[0025] Figure 2 This is an exploded perspective view of the manual clutch release structure of the electric push rod provided by the present invention. Figure 1 ;

[0026] Figure 3 This is an exploded perspective view of the manual clutch release structure of the electric push rod provided by the present invention. Figure 2 ;

[0027] Figure 4 It is a schematic cross-sectional structure diagram of a manual clutch release structure of an electric push rod provided by the present invention;

[0028] Figure 5 It is a structural schematic diagram of the positioning shaft and the internal gear shaft provided by the present invention;

[0029] Figure 6 The present invention Figure 5 A is an enlarged schematic diagram.

[0030] In the figure: screw transmission mechanism 10, linkage gear box 20, drive motor 30, separation mechanism 40, first linkage shaft 21, first external gear 22, second linkage shaft 23, second external gear 24, internal gear shaft 25, bearing 26, rotating chamber 27, second spring 28, positioning shaft 29, through chamber 251, expansion chamber 252, annular step 253, annular groove 254, push ring 291, pull switch 292, movable bearing 293, pull cover 294, pull ring 295, pull rope 296, inner ring 297, outer ring 298, rolling ball 299, rolling ball 2911, wrench 41, loose end 42, loose shaft 43, loose upper end cover 421, loose lower end cover 422, first spring 423. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0033] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] Reference Figure 1-6 The figure shows a preferred embodiment of the present invention.

[0035] The manual clutch release structure of the electric push rod includes a screw transmission mechanism 10, a drive motor 30 and a linkage gear box 20. The screw transmission mechanism 10 is meshed with the drive motor 30 through the linkage gear box 20. The linkage gear box 20 includes a first linkage shaft 21 and a second linkage shaft 23. A first external gear 22 is provided on the outer periphery of the first linkage shaft 21, and the first external gear 22 is meshed with the drive motor 30. A second external gear 24 is provided on the outer periphery of the second linkage shaft 23, and the second external gear 24 is meshed with the screw transmission mechanism 10.

[0036] The first linkage shaft 21 and the second linkage shaft 23 are arranged opposite to each other longitudinally, and are connected to each other through an internal gear shaft 25 , to which a separation mechanism 40 is connected for disconnecting the transmission between the first linkage shaft 21 and the second linkage shaft 23 .

[0037] The manual clutch release structure of the electric push rod provided above can manually control the internal gear shaft 25 through the separation mechanism 40 to disconnect the transmission of the first linkage shaft 21 and the second linkage shaft 23, thereby separating the transmission between the drive motor 30 and the screw transmission mechanism 10, so that the electric push rod can still achieve the contraction action of the inner tube when the power is off. The structure is simple in design, reliable in operation, and highly practical, and is suitable for popularization and use, which solves the problem that the electric push rod cannot achieve the contraction action of the inner tube when the power is off.

[0038] In this embodiment, the first external gear 22 and the second external gear 24 are arranged with a relative spacing in the longitudinal direction, the bottom of the first linkage shaft 21 is inserted into the top of the second linkage shaft 23, and the outer wall of the first linkage shaft 21 and the inner wall of the second linkage shaft 23 are arranged with a spacing, when the first linkage shaft 21 and the second linkage shaft 23 are disconnected from the transmission, the rotation between the first linkage shaft 21 and the second linkage shaft 23 will not affect each other;

[0039] The top of the second linkage shaft 23 has a limiting groove formed by an inward recess, and the limiting groove is arranged in a ring shape. The bottom of the first linkage shaft 21 is located in the limiting groove, so that the positioning rotation between the first linkage shaft 21 and the second linkage shaft 23 can be increased; bearings 26 are respectively provided on the outer periphery of the first linkage shaft 21 and the outer periphery of the second linkage shaft 23, so that the rotation of the first linkage shaft 21 and the second linkage shaft 23 is facilitated.

[0040] In this embodiment, the separation mechanism 40 includes a wrench 41, a loosening end 42 and a loosening shaft 43. The wrench 41 and the loosening shaft 43 are connected through the loosening end 42. The upper and lower ends of the loosening shaft 43 are movably abutted against the loosening end 42 and the inner gear shaft 25 respectively.

[0041] By manually controlling the wrench 41 to rotate, the wrench 41 uses the loosening end 42 to apply pressure to the loosening shaft 43, so that the loosening shaft 43 drives the internal gear shaft 25 to separate from the first linkage shaft 21 or the loosening shaft 43 drives the internal gear shaft 25 to separate from the second linkage shaft 23, thereby realizing the disconnection of the transmission between the first linkage shaft 21 and the second linkage shaft 23.

[0042] In this embodiment, the loosening end 42 includes a loosening upper end cover 421, a loosening lower end cover 422 and a first spring 423. The first spring 423 is sleeved on the upper periphery of the loosening shaft 43. The loosening upper end cover 421 is located above the loosening lower end cover 422. The loosening upper end cover 421 and the loosening lower end cover 422 are connected by the first spring 423. The wrench 41 and the loosening lower end cover 422 are rotatably connected by the loosening upper end cover 421. The loosening lower end cover 422 and the loosening upper end cover 421 are respectively sleeved on the upper part of the loosening shaft 43, and the loosening upper end cover 421 and the loosening lower end cover 422 are arranged longitudinally.

[0043] The loose upper end cover 421 is rotated by the wrench 41 to apply pressure to the loose lower end cover 422, so that the loose lower end cover 422 drives the loose shaft 43 to move toward the inner gear shaft 25. When the inner gear shaft 25 is reset, the loose end 42 drives the loose upper end cover 421 to reset through the first spring 423.

[0044] In this embodiment, the first linkage shaft 21 has a first gear chute with a bottom opening, the second linkage shaft 23 has a second gear chute with a top opening, the second gear chute and the first gear chute enclose a rotation cavity 27, the inner gear shaft 25 is meshed with the rotation cavity 27, the inner gear shaft 25 is connected to a second spring 28 for driving the inner gear shaft 25 to return to its original position, and the second spring 28 is located in the rotation cavity 27;

[0045] The upper and lower ends of the internal gear shaft 25 are movably in contact with the release shaft 43 and the second spring 28 respectively.

[0046] The rotating cavity 27 is provided with tooth grooves meshing with the inner gear shaft 25 , and the inner gear shaft 25 drives the rotating cavity 27 to rotate through the tooth grooves, thereby realizing the transmission work of the first linkage shaft 21 and the second linkage shaft 23 .

[0047] In this embodiment, a positioning shaft 29 passes through the second linkage shaft 23 from bottom to top, and the top of the positioning shaft 29 passes through the internal gear shaft 25 from bottom to top and is inserted into the release shaft 43 .

[0048] The internal gear shaft 25 can be vertically limited in the rotating cavity 27 by the positioning shaft 29 to prevent the internal gear shaft 25 from shaking during the up and down movement.

[0049] In this embodiment, the second spring 28 is sleeved on the outer periphery of the positioning shaft 29. The top of the second spring 28 abuts against the bottom of the inner gear shaft 25, so that the inner gear shaft 25 can be driven to reset by the second spring 28, and the first linkage shaft 21 and the second linkage shaft 23 are connected in transmission.

[0050] In this embodiment, a push ring 291 is protruding outward from the top periphery of the positioning shaft 29, and the push ring 291 is located in the release shaft 43; the inner gear shaft 25 has a through cavity 251 for the positioning shaft 29 to pass through, and the through cavity 251 has an expansion cavity 252 that expands outward, and the diameter of the expansion cavity 252 is greater than the diameter of the through cavity 251. An annular step 253 is formed between the bottom of the expansion cavity 252 and the inner side wall of the through cavity 251, and the annular step 253 is arranged vertically opposite to the push ring 291;

[0051] The bottom of the positioning shaft 29 is exposed outside the rotating chamber 27, and a pull switch 292 for driving the positioning shaft 29 to move is connected to the bottom of the positioning shaft 29;

[0052] When the pull switch 292 pulls the positioning shaft 29 away from the release shaft 43, the push ring 291 abuts against the annular step 253 and drives the internal gear shaft 25 to move away from the release shaft 43, so as to disconnect the transmission of the first linkage shaft 21 and the second linkage shaft 23.

[0053] When the wrench 41 and the loose end 42 fail, the positioning shaft 29 can be driven to move toward the inner gear shaft 25 by pulling the switch 292, and the positioning shaft 29 abuts against the annular step 253 through the push ring 291, and drives the inner gear shaft 25 to move away from the loose shaft 43, so as to disconnect the transmission of the first linkage shaft 21 and the second linkage shaft 23;

[0054] When the switch of the driving motor 30 fails, the driving motor 30 can also drive the positioning shaft 29 to move toward the inner gear shaft 25 by pulling the switch 292 during rotation, and the positioning shaft 29 abuts against the annular step 253 through the pushing ring 291, and drives the inner gear shaft 25 to move away from the loosening shaft 43, so as to disconnect the transmission of the first linkage shaft 21 and the second linkage shaft 23.

[0055] In this embodiment, the pull switch 292 includes a movable bearing 293 and a pull cover 294. The movable bearing 293 is mounted on the bottom of the positioning shaft 29. The pull cover 294 is mounted on the movable bearing 293. The pull cover 294 is provided with a pull ring 295. The pull ring 295 is connected to a pull rope 296. The other end of the pull rope 296 is connected to a pull buckle.

[0056] The movable bearing 293 includes an inner ring 297 and an outer ring 298 . The outer ring 298 and the inner ring 297 are rotatably connected via a ball 299 . The inner ring 297 is sleeved on the bottom periphery of the positioning shaft 29 , and the pulling cover 294 is installed on the outer ring 298 .

[0057] The pull ring 295 can be pulled by the pull buckle and the pull rope 296, so that the pull ring 295 drives the pull cover 294 to drag the movable bearing 293 to move, so that the movable bearing 293 can drive the positioning shaft 29 to move toward the inner gear shaft 25, so as to disconnect the transmission of the first linkage shaft 21 and the second linkage shaft 23.

[0058] In this embodiment, the push ring 291 has a push end surface facing the annular step 253, and a plurality of rolling balls 2911 are arranged on the push end surface. The plurality of rolling balls 2911 are arranged at intervals along the circumference of the push end surface.

[0059] The annular step 253 has an annular groove 254 which is recessed inwards. The annular groove 254 is arranged around the circumference of the annular step 253 . The pushing end surface is movably abutted against the annular groove 254 of the annular step 253 through the rolling ball 2911 .

[0060] When the push ring 291 abuts against the annular step 253, the push ring 291 abuts against the annular groove 254 through the rolling ball 2911, reducing the contact area between the push ring 291 and the annular step 253, thereby reducing the friction resistance therebetween, making it easier to disconnect the transmission of the first linkage shaft 21 and the second linkage shaft 23.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The manual clutch release structure of the electric push rod is characterized by: It includes a screw transmission mechanism, a driving motor and a linkage gear box, wherein the screw transmission mechanism is meshed with the driving motor through the linkage gear box, and the linkage gear box includes a first linkage shaft and a second linkage shaft, wherein a first external gear is arranged on the outer periphery of the first linkage shaft, and the first external gear is meshed with the driving motor, and a second external gear is arranged on the outer periphery of the second linkage shaft, and the second external gear is meshed with the screw transmission mechanism; The first linkage shaft and the second linkage shaft are arranged opposite to each other longitudinally, and are connected to each other through an internal gear shaft. A separation mechanism for disconnecting the first linkage shaft from the second linkage shaft is connected to the internal gear shaft.

2. The manual clutch release structure of the electric push rod according to claim 1, characterized in that: The first external gear and the second external gear are arranged longitudinally with a relative spacing, the bottom of the first linkage shaft is inserted into the top of the second linkage shaft, and the outer side wall of the first linkage shaft and the inner side wall of the second linkage shaft are arranged with a spacing; The top of the second linkage shaft has a limiting groove formed inwardly concave, and the limiting groove is arranged in a ring shape. The bottom of the first linkage shaft is located in the limiting groove, and bearings are respectively sleeved on the outer periphery of the first linkage shaft and the outer periphery of the second linkage shaft.

3. The manual clutch release structure of the electric push rod according to claim 1, characterized in that: The separation mechanism comprises a wrench, a loose end and a loose shaft. The wrench and the loose shaft are connected via the loose end. The upper and lower ends of the loose shaft are movably abutted against the loose end and the inner gear shaft respectively.

4. The manual clutch release structure of the electric push rod according to claim 3, characterized in that: The loose end includes a loose upper end cover, a loose lower end cover and a first spring, the first spring is sleeved on the upper periphery of the loose shaft, the loose upper end cover is located above the loose lower end cover, the loose upper end cover and the loose lower end cover are connected by the first spring sleeve, the wrench is rotatably connected to the loose lower end cover by the loose upper end cover, the loose lower end cover and the loose upper end cover are respectively sleeved on the upper part of the loose shaft, and the loose upper end cover and the loose lower end cover are arranged longitudinally.

5. The manual clutch release structure of the electric push rod according to claim 4, characterized in that: The first linkage shaft has a first gear slot with a bottom opening, the second linkage shaft has a second gear slot with a top opening, the second gear slot and the first gear slot enclose a rotation cavity, the inner gear shaft is meshed with the rotation cavity, the inner gear shaft is connected to a second spring for driving the inner gear shaft to return to its original position, and the second spring is located in the rotation cavity; The upper and lower ends of the inner gear shaft are respectively in movably contact with the loosening shaft and the second spring.

6. The manual clutch release structure of the electric push rod according to claim 4, characterized in that: Along the direction from bottom to top, a positioning shaft penetrates the second linkage shaft, and the top of the positioning shaft penetrates the internal gear shaft from bottom to top and is inserted into the loosening shaft.

7. The manual clutch release structure of the electric push rod according to claim 6, characterized in that: The second spring is sleeved on the outer circumference of the positioning shaft.

8. The manual clutch release structure of the electric push rod according to claim 6, characterized in that: The top periphery of the positioning shaft is provided with a push ring protruding outward, and the push ring is located in the loosening shaft; the inner gear shaft has a through cavity for the positioning shaft to pass through, and the through cavity has an expansion cavity expanding outward, the diameter of the expansion cavity is larger than the diameter of the through cavity, and an annular step is formed between the bottom of the expansion cavity and the inner side wall of the through cavity, and the annular step is arranged vertically opposite to the push ring; The bottom of the positioning shaft is exposed outside the rotating cavity, and a pull switch for driving the positioning shaft to move is connected to the bottom of the positioning shaft; When the pull switch pulls the positioning shaft away from the release shaft, the push ring abuts against the annular step and drives the internal gear shaft to move away from the release shaft, so as to disconnect the transmission of the first linkage shaft and the second linkage shaft.

9. The manual clutch release structure of the electric push rod according to claim 8, characterized in that: The pull switch comprises a movable bearing and a pull cover, wherein the movable bearing is mounted on the bottom of the positioning shaft, the pull cover is mounted on the movable bearing, a pull ring is provided on the pull cover, and a pull rope is connected to the pull ring; The movable bearing comprises an inner ring and an outer ring, the outer ring and the inner ring are rotatably connected via a rolling ball, the inner ring is sleeved on the bottom periphery of the positioning shaft, and the pull cover is mounted on the outer ring.

10. The manual clutch release structure of the electric push rod according to claim 9, characterized in that: The push ring has a push end surface facing the annular step, and a plurality of rolling balls are arranged on the push end surface, and the plurality of rolling balls are arranged at intervals along the circumference of the push end surface; The annular step is provided with an annular groove which is recessed inwards and is arranged around the circumference of the annular step; the pushing end surface is movably abutted against the annular groove of the annular step through a rolling ball.

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