Push button electric actuator

Abstract

The present application relates to a kind of press type electric actuators, box and box cover fixed connection to form shell, lock rod rotatably installed on shell, press type electric actuators include press locking structure, which is by first trajectory slot, second trajectory slot and lock protrusion constitute, the first trajectory slot is formed on the inner wall of box, the second trajectory slot is formed on the bottom edge of box cover, the lock protrusion is formed on the outer wall of lock rod, first trajectory slot and second trajectory slot jointly define press slot, lock protrusion moves along the movement track defined by press slot, motor and transmission mechanism are installed in the inside of shell, transmission mechanism is connected with motor and cooperates with lock rod to realize the electric locking of lock rod.The press type electric actuators of the present application provide split press slot, demoulding is simple, product quality is controllable, cost is low, and, first trajectory slot, lock protrusion and second trajectory slot are installed layer by layer " sandwich " type, simple and convenient.

Description

Technical Field

[0001] The present invention relates to a vehicle, and more particularly to a push-type electric actuator. Background Art

[0002] The known actuator is an automatic opening and closing device for a cover in a vehicle (such as a fuel tank cover or a charging port cover). The automatic opening and closing device includes a housing and a locking rod rotatably mounted on the housing, wherein a slot block is fixed to the housing, and a concave pressing groove is formed on the slot block to define the movement trajectory of the locking protrusion of the locking rod. In manufacturing, the demoulding of the slot block with the concave pressing groove is not only cumbersome, but also the product quality is uncontrollable, resulting in high costs. In assembly, it is very inconvenient to insert and install the locking protrusion perpendicular to the plane of the pressing groove. Summary of the Invention

[0003] In order to solve the above-mentioned problems of the complicated manufacturing of the pressing groove structure in the prior art, the present invention provides a pressing type electric actuator.

[0004] According to the present invention, the push-type electric actuator includes a box body, a box cover, a locking rod, a motor and a transmission mechanism, wherein the box body and the box cover are fixedly connected to form a shell, and the locking rod is rotatably and liftably installed on the shell. The push-type electric actuator includes a push-locking structure, which is composed of a first track groove, a second track groove and a locking protrusion. The first track groove is formed on the inner wall of the box body, the second track groove is formed on the bottom edge of the box cover, and the locking protrusion is formed on the outer wall of the locking rod. The first track groove and the second track groove jointly define a push groove, and the locking protrusion moves along the motion track defined by the push groove. The motor and the transmission mechanism are installed inside the shell, and the transmission mechanism is connected to the motor and cooperates with the locking rod to realize electric locking of the locking rod.

[0005] In a preferred embodiment, the push-type electric actuator further comprises a sleeve and a spring, wherein the sleeve is accommodated and installed at the bottom of the locking rod, and the spring is arranged between the box body and the sleeve to push the locking rod by spring force.

[0006] In a preferred embodiment, the locking rod has n locking protrusions evenly distributed in the circumferential direction, and the pressing groove corresponds to n motion trajectories from locking to unlocking. Each locking protrusion limits the circumferential cyclic rotation of the locking rod through n continuous motion trajectories.

[0007] In a preferred embodiment, the starting point and the end point of each motion trajectory are at the same height.

[0008] In a preferred embodiment, the downward path of the first track groove and the first contact surface of the locking protrusion respectively have an angle α greater than 10° with the horizontal plane, and the upward path of the second track groove and the second contact surface of the locking protrusion respectively have an angle β greater than 10° with the horizontal plane.

[0009] In a preferred embodiment, the first and second track grooves and the first and second contact surfaces are helical surfaces respectively.

[0010] In a preferred embodiment, the transmission mechanism includes an inner ring gear, a sun gear, planetary gears, a planetary carrier and a rack, wherein the inner ring gear is fixedly mounted inside the housing above the motor, the sun gear is mounted on the output shaft of the motor, the planetary gears are mounted on the planetary carrier and mesh with the inner ring gear and the sun gear respectively, and the rack meshes with the planetary carrier having a gear structure to be inserted into the lock hole of the locking rod under the drive of the motor, so as to limit the lifting and lowering movement of the locking rod by electric locking in the mechanical locking position of the locking rod.

[0011] In a preferred embodiment, the push-type electric actuator also includes an emergency unlocking structure, which is composed of a winding wheel and an emergency pull rope. The planetary carrier extends through the box cover, the winding wheel is installed on the protruding end of the planetary carrier, and the emergency pull rope is fixedly installed on the winding wheel. The winding wheel is connected to the transmission mechanism on the box cover to reversely drive the rack to achieve manual emergency unlocking.

[0012] In a preferred embodiment, the box cover includes a body and a rubber bag, wherein the rubber bag includes an integrally formed first sealing ring, a second sealing ring and a connecting structure, the locking rod passes through the box cover through the first sealing ring, the planetary carrier passes through the box cover through the second sealing ring, and the first sealing ring and the second sealing ring are connected together through the connecting structure.

[0013] In a preferred embodiment, the connection structure includes a protrusion structure embedded in the body so as to be locked in the body to prevent it from falling off.

[0014] The push-type electric actuator of the present invention utilizes a housing to provide a split push-type groove. This groove is formed by the edges of the housing and lid, simplifying demolding, ensuring controllable product quality, and reducing costs. Furthermore, the first track groove, locking protrusion, and second track groove are assembled layer by layer in a "sandwich" arrangement, making assembly simple and convenient. Furthermore, the push-type electric actuator of the present invention utilizes a planetary gear train transmission mechanism, reducing overall packaging size and providing a high locking force. The planetary carrier allows for low-force emergency unlocking. The encapsulation not only addresses the prior art issue of emergency unlocking within a limited volume but lacking waterproofing, but also ensures IP67-level waterproofing for the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a schematic diagram of the overall structure of a push-type electric actuator according to a preferred embodiment of the present invention.

[0016] Figure 2 It is omitted Figure 1 Schematic diagram of the partial structure of the push-type electric actuator with a locking rod and a housing.

[0017] Figure 3 yes Figure 1 Exploded diagram of a push-type electric actuator.

[0018] Figure 4 yes Figure 1 Cross-sectional view of a push-type electric actuator.

[0019] Figure 5 yes Figure 1 Schematic diagram of the structure of the push-lock structure of the push-type electric actuator.

[0020] Figure 6 Show Figure 5 The motion trajectory of the locking protrusion of the press-locking structure.

[0021] Figure 7 yes Figure 3 Top view of the locking lever.

[0022] Figure 8 Shows the movement trajectory of a locking protrusion in the pressing groove.

[0023] Figure 9 The included angle of the track groove is shown.

[0024] Figure 10 yes Figure 3 A partial enlarged view of the locking protrusion of the locking rod.

[0025] Figure 11 yes Figure 1 A cross-sectional view of the locking rod and transmission mechanism of a push-type electric actuator.

[0026] Figure 12 yes Figure 11 Schematic diagram of the structure of the first stage transmission.

[0027] Figure 13 yes Figure 11 Schematic diagram of the structure of the second stage transmission.

[0028] Figure 14 yes Figure 1 FIG. 1 is a diagram showing the unlocking process of the emergency unlocking structure of the push-type electric actuator between the locked position and the unlocked position.

[0029] Figure 15 yes Figure 3 Schematic diagram of the structure of the box cover.

[0030] Figure 16 yes Figure 1 Assembly process diagram of push-type electric actuator.

[0031] Figure 17 yes Figure 1 The complete action diagram of the push-type electric actuator. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings and described in detail.

[0033] like Figures 1-4 As shown, a push-type electric actuator according to a preferred embodiment of the present invention includes a housing 1, a housing cover 2, a locking rod 3, a sleeve 4, and a spring 5. The housing 1 and the housing cover 2 are fixedly connected to form a housing, and the locking rod 3 is rotatably and liftably mounted on the housing 1 via the sleeve 4 and the spring 5. Specifically, the sleeve 4 is received at the bottom of the locking rod 3. The housing 1 has a protrusion 1a for limiting the spring 5. The spring 5 is disposed between the housing 1 and the sleeve 4 to push the locking rod 3 by its spring force.

[0034] like Figure 5 As shown, the push-type electric actuator includes a push-locking structure, which is composed of a first track groove 11, a second track groove 21 and a locking protrusion 31. The first track groove 11 defines a pressing track line, and the second track groove 21 defines a rebound track line. Specifically, the first track groove 11 is formed on the inner wall of the box body 1, and the second track groove 21 is formed on the bottom edge of the box cover 2. Figure 3 , the locking protrusion 31 is formed on the outer wall of the locking rod 3, and the first track groove 11 and the second track groove 21 jointly define the pressing groove, and the locking protrusion 31 moves along the motion track defined by the pressing groove. Compared with the existing technology that requires the additional introduction of slot blocks, the present invention directly provides a split pressing groove through the outer shell. In manufacturing, the pressing groove is provided by the inner wall of the box body 1 and the edge of the box cover 2, which is simple to demould, the product quality is controllable, and the cost is low. Moreover, in assembly, the first track groove 11, the locking protrusion 31 and the second track groove 21 are installed layer by layer in a "sandwich" style, which is simple and convenient. In short, the press-locking structure of the present invention omits the slot blocks, has fewer parts, and is simpler in structure, manufacturing and assembly. This can solve the problems of difficult manufacturing, assembly, control and high cost of the track groove in the prior art.

[0035] like Figure 6As shown, the second track groove 21 has an unlocking position. When the lock protrusion 31 is in the unlocking position, the lock rod 3 is manually pressed to enter the movement track, and the lock protrusion 31 moves downward along the first path A to overcome the spring force of the spring 5; the lock rod 3 is manually pressed again, and the lock protrusion 31 contacts the first track groove 11 along the second path B. The lock rod 3 moves downward while rotating clockwise, overcoming the spring force of the spring 5; the lock rod 3 is released, and the lock protrusion 31 moves upward along the third path C under the action of the spring force of the spring 5; the lock rod 3 is continuously released, and the lock protrusion 31 contacts the second track groove 21 along the fourth path D, and the lock rod 3 moves upward under the action of the spring force of the spring 5 The locking rod 3 is manually pressed, and the locking protrusion 31 moves downward along the fifth path E, overcoming the spring force of the spring 5. The locking rod 3 is further manually pressed, and the locking protrusion 31 contacts the first track groove 11 along the sixth path F. The locking rod 3 rotates clockwise and moves downward while overcoming the spring force of the spring 5. The locking rod 3 is released, and the locking protrusion 31 moves upward along the seventh path G under the spring force of the spring 5. The locking rod 3 is released, and the locking protrusion 31 contacts the second track groove 21 along the eighth path H. The locking rod 3 moves upward under the spring force of the spring 5 while rotating clockwise, exiting the motion track. It should be understood that the clockwise rotation here is only for example and not limitation, and counterclockwise rotation is also feasible.

[0036] like Figure 7 As shown, the lock rod 3 has two symmetrically arranged lock protrusions 31, one lock protrusion 31 corresponds to the locking→unlocking motion track of the second track groove 21 in the pressing groove as shown in FIG. Figure 8 As shown, the two locking protrusions 31 correspond to a complete 360°, thereby limiting the circumferential rotation of the locking rod 3. Correspondingly, the first track groove 11 has two sections, as shown in FIG. Figure 9 As shown, the heights of the two points I and J of the 180° section of the first track groove 11 are consistent, ensuring that the next section of the first track groove 11 can be smoothly connected. The downward path of the first track groove 11 has an angle α greater than 10° (preferably greater than 30°, for example, 35°) with the horizontal plane, and the upward path of the second track groove 21 has an angle β greater than 10° (preferably greater than 20°, for example, 23°) with the horizontal plane. Figure 10 , the first contact surface 31a of the corresponding locking protrusion 31 has an angle α with the horizontal plane, and the second contact surface 31b of the corresponding locking protrusion 31 has an angle β with the horizontal plane. In fact, the track grooves 11, 21 and the contact surfaces 31a, 31b are spiral surfaces, so that the locking protrusion 31 and the track grooves 11, 21 are in surface contact at all times, reducing unnecessary wear on the locking protrusion 31. It should be understood that the two locking protrusions here are only examples and not limitations, in order to achieve an unlocking angle of 180°, and the number of locking protrusions can actually be adjusted according to needs; the spiral surface here is also only an example and not a limitation, in order to reduce wear, and the vertical surface (a smooth surface with a fixed angle) has no functional impact.

[0037] Back to Figures 1-4 According to a preferred embodiment of the present invention, the push-type electric actuator further includes a motor 6 and a transmission mechanism 7, wherein the motor 6 and the transmission mechanism 7 are installed inside the box 1, and the transmission mechanism 7 is connected to the motor 6 and cooperates with the lock rod 3 to realize the electric locking of the lock rod 3. Specifically, in combination with Figure 11-13 The transmission mechanism 7 comprises a first-stage transmission 7a and a second-stage transmission 7b. The first-stage transmission 7a comprises an inner ring gear 71, a sun gear 72, planetary gears 73, and a planetary carrier 74. The second-stage transmission 7b comprises a planetary carrier 74 with a gear structure and a rack 75. The inner ring gear 71 is fixedly mounted inside the housing above the motor 6. The sun gear 72 is interference-fitted onto the output shaft of the motor 6. The planetary gears 73 are mounted on the planetary carrier 74 and mesh with the inner ring gear 71 and sun gear 72, respectively. The rack 75 meshes with the planetary carrier 74 with a gear structure and, driven by the motor 6, is inserted into the locking hole of the locking rod 3. When the locking rod 3 is in the mechanically locked position, it is electrically locked to restrict the lifting and lowering movement of the locking rod 3. Specifically, when the motor 6 is energized, the sun gear 72 drives the planetary gears 73 to rotate, and the planetary carrier 74 drives the locking tongue of the corresponding rack 75 into the locking hole of the locking rod 3. In particular, the inner ring gear 71 has a soft rubber stop 711, which serves as the first contact point during the electric locking function to reduce hard contact. It is understood that the soft rubber stop point 711 is merely an additional function; the locking function can still be achieved even without the soft stop point. Clearly, the transmission mechanism 7 of the present invention is a planetary gear train structure, which provides high locking / unlocking forces within a limited space. This solves the problem of insufficient locking / unlocking forces of the small motor 6 in the prior art and enables electric locking and unlocking in extreme conditions such as high temperature and low pressure.

[0038] Back to Figures 1-4 According to a preferred embodiment of the present invention, the push-type electric actuator further includes an emergency unlocking structure, which is composed of a winding wheel 8 and an emergency pull rope 9. Specifically, the planetary carrier 74 extends through the box cover 2, the winding wheel 8 is mounted on the protruding end of the planetary carrier 74, and the emergency pull rope 9 is fixedly mounted on the winding wheel 8. The winding wheel 8 is connected to the transmission mechanism 7 on the box cover 2 to achieve manual emergency unlocking. In this embodiment, the winding wheel 8 and the emergency pull rope 9 are connected together by plastic coating. It should be understood that plastic coating is only an example and not a limitation, and other assembly methods are also feasible, such as gluing. Figure 14As shown, the emergency pull rope 9 is manually pulled to rotate the winding wheel 8. Since the winding wheel 8 and the planetary carrier 74 are connected together by a buckle, the planetary carrier 74 is driven to rotate, thereby driving the rack 75 in reverse, thereby realizing manual emergency unlocking and electric locking. It can be understood that the buckle is only a connection method, and the connection can also be achieved by welding, pasting, hot riveting and other processes. Obviously, the planetary gear system structure of the present invention is not self-locking, and with the help of the planetary carrier 74 with a larger radius, a small force value emergency unlocking can be achieved. In particular, there is a stop point 22 on the box cover 2, and the winding wheel 8 hits the stop point 22 to achieve positioning, and the force will not be transmitted to the inside of the planetary gear system.

[0039] like Figure 15 As shown, the box cover 2 includes a body 23 and a rubber bag 24, wherein the rubber bag 24 includes an integrally formed first sealing ring 241, a second sealing ring 242 and a connecting structure 243, the locking rod 3 passes through the box cover 2 through the first sealing ring 241, the planetary carrier 74 passes through the box cover 2 through the second sealing ring 242, and the first sealing ring 241 and the second sealing ring 242 are connected together by the connecting structure 243, which reduces the manufacturing complexity, reduces the assembly complexity, and achieves a high level of dust and water resistance. In this embodiment, the above-mentioned blocking point 22 is included in the rubber bag 24. In particular, the connecting structure 243 includes a convex point structure embedded in the body 23 to be clamped in the body 23 to prevent it from falling off. In fact, the present invention not only solves the problem of emergency unlocking but not waterproof under limited volume in the prior art, but also achieves IP67 and above level waterproofing of the entire system.

[0040] The following briefly describes the assembly process of the push-type electric actuator according to the present invention. Figure 16 As shown, first assemble the motor 6 and the sun gear 72 on the box body 1, then assemble the inner ring gear 71 and the planetary gear 73, and then assemble the planetary carrier 74 and the rack 75. At this time, the electric locking component is installed, and then assemble the spring 5 and the sleeve 4, and then assemble the locking rod 3. At this time, after the mechanical locking component is installed, then weld the box cover 2 to the box body 1, and then assemble the winding wheel 8 and the emergency pull rope 9.

[0041] The following briefly describes the entire set of actions of the push-type electric actuator according to the present invention. Figure 17As shown, in the first state of mechanical unlocking and electric unlocking, the lock rod 3 is at a circumferential absolute position of 0°, the lock rod 3 is pressed down, and the lock rod 3 moves downward and rotates. In this embodiment, the lock rod 3 moves downward by 14 mm and rotates by 90°, the locking piece 32 on the lock rod 3 engages with the door plate, mechanical locking is achieved, and the lock rod 3 is at a circumferential absolute position of 90°. The motor 6 is powered on, the rack 75 is driven by the planetary wheel 73 and the planet carrier 74 to move leftward, electric locking is performed, the entire locking movement is completed, and the lock rod 3 is at a circumferential absolute position of 90°. The motor 6 is powered on, the rack 75 is driven by the planetary wheel 73 and the planet carrier 74 to move rightward, electric unlocking is performed, the entire unlocking movement is completed, and the lock rod 3 is at a circumferential absolute position of 180°. The lock rod 3 is pressed down, the lock rod 3 moves downward and rotates. In this embodiment, the lock rod 3 moves downward by 3 mm and rotates by 90°, the locking piece 32 on the lock rod 3 disengages from the door plate, mechanical unlocking is performed, the entire unlocking movement is completed, and the lock rod 3 is at a circumferential absolute position of 180°.

[0042] The above is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application. The above embodiment of the present application can be variously changed. Any simple, equivalent change and modification made according to the content of the claims and the specification of the present application falls within the scope of the present application. The present application is not described in detail, and is conventional technical content.

Claims

1. A push-type electric actuator, characterized in that: The push-type electric actuator includes a box body, a box cover, a locking rod, a motor and a transmission mechanism, wherein the box body and the box cover are fixedly connected to form a shell, and the locking rod is rotatably and liftably installed on the shell. The push-type electric actuator includes a push-locking structure, which is composed of a first track groove, a second track groove and a locking protrusion. The first track groove is formed on the inner wall of the box body, the second track groove is formed on the bottom edge of the box cover, and the locking protrusion is formed on the outer wall of the locking rod. The first track groove and the second track groove jointly define a push groove, and the locking protrusion moves along the motion track defined by the push groove. The motor and the transmission mechanism are installed inside the shell, and the transmission mechanism is connected to the motor and cooperates with the locking rod to realize electric locking of the locking rod.

2. The push-type electric actuator according to claim 1, characterized in that: The push-type electric actuator further comprises a sleeve and a spring, wherein the sleeve is accommodated and installed at the bottom of the locking rod, and the spring is arranged between the box body and the sleeve to push the locking rod through the spring force.

3. The push-type electric actuator according to claim 1, characterized in that: The locking rod has n locking protrusions evenly distributed in the circumferential direction, and the pressing groove corresponds to n motion tracks from locking to unlocking. Each locking protrusion limits the circumferential rotation of the locking rod through the continuous n motion tracks.

4. The push-type electric actuator according to claim 3, characterized in that: The starting point and end point of each motion trajectory are at the same height.

5. The push-type electric actuator according to claim 1, characterized in that: The downward path of the first track groove and the first contact surface of the locking protrusion respectively have an angle α greater than 10° with the horizontal plane, and the upward path of the second track groove and the second contact surface of the locking protrusion respectively have an angle β greater than 10° with the horizontal plane.

6. The push-type electric actuator according to claim 5, characterized in that: The first and second track grooves and the first and second contact surfaces are helical surfaces respectively.

7. The push-type electric actuator according to claim 1, characterized in that: The transmission mechanism includes an inner ring gear, a sun gear, planetary gears, a planetary carrier and a rack, wherein the inner ring gear is fixedly mounted inside the housing above the motor, the sun gear is mounted on the output shaft of the motor, the planetary gears are mounted on the planetary carrier and mesh with the inner ring gear and the sun gear respectively, and the rack meshes with the planetary carrier with a gear structure to be inserted into the lock hole of the locking rod under the drive of the motor, so as to limit the lifting and lowering movement of the locking rod by electric locking when the locking rod is in the mechanical locking position.

8. The push-type electric actuator according to claim 7, characterized in that: The push-type electric actuator also includes an emergency unlocking structure, which consists of a winding wheel and an emergency pull rope. The planetary carrier extends through the box cover, the winding wheel is installed on the protruding end of the planetary carrier, and the emergency pull rope is fixedly installed on the winding wheel. The winding wheel is connected to the transmission mechanism on the box cover to reverse drive the rack to achieve manual emergency unlocking.

9. The push-type electric actuator according to claim 1, characterized in that: The box cover includes a body and a rubber bag, wherein the rubber bag includes an integrally formed first sealing ring, a second sealing ring and a connecting structure, the locking rod passes through the box cover through the first sealing ring, the planetary carrier passes through the box cover through the second sealing ring, and the first sealing ring and the second sealing ring are connected together through the connecting structure.

10. The push-type electric actuator according to claim 9, characterized in that: The connection structure includes a convex point structure embedded in the body to be clamped in the body to prevent it from falling off.

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