Pressing type electric actuator

Abstract

A box body and a box cover are fixedly connected to form a shell, a lock rod is rotatably installed on the shell in a lifting mode, the pressing type electric actuator comprises a pressing locking structure, the pressing locking structure is composed of a first track groove, a second track groove and a locking protrusion, the first track groove is formed in the inner wall of the box body, and the second track groove is formed in the inner wall of the box body. The second track groove is formed in the bottom edge of the box cover, the lock protrusion is formed on the outer wall of the lock rod, the first track groove and the second track groove jointly limit a pressing groove, the lock protrusion moves along the movement track limited by the pressing groove, and the motor and the transmission mechanism are installed in the shell. The transmission mechanism is connected with the motor and matched with the lock rod to achieve electric locking of the lock rod. According to the pressing type electric actuator, the split type pressing grooves are provided, demolding is easy, product quality is controllable, cost is low, and the first track grooves, the locking protrusions and the second track grooves are installed in a sandwich mode layer by layer, so that the pressing type electric actuator is easy and convenient to use.

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 problems of complicated manufacturing of the pressing groove structure in the above-mentioned prior art, the present invention provides a pressing type electric actuator.

[0004] According to the push-type electric actuator of the present invention, it 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 the spring force.

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

[0007] In a preferred embodiment, the heights of the starting point and the end point of each motion trajectory are consistent.

[0008] In a preferred embodiment, the downward path of the first trajectory 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 trajectory 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, a planetary gear, 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 gear is mounted on the planetary carrier and meshes with the inner ring gear and the sun gear respectively, and the rack meshes with the planetary carrier having a gear structure so as 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 reverse-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 clamped in the body to prevent it from falling off.

[0014] According to the push-type electric actuator of the present invention, a split push groove is provided by the shell. In manufacturing, the push groove is provided by the edge of the box body and the box cover, demoulding is simple, product quality is controllable, and cost is low. Moreover, in assembly, the first track groove, the locking protrusion, and the second track groove are installed layer by layer in a "sandwich" style, which is simple and convenient. In addition, according to the push-type electric actuator of the present invention, the transmission mechanism is a planetary gear train structure, which reduces the overall packaging size and has a higher locking force / locking force. With the help of the planetary frame, emergency unlocking with a small force value can be achieved. The rubber encapsulation not only solves the problem of emergency unlocking but not waterproofing in a limited volume in the prior art, but also achieves IP67 level waterproofing of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It 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 a push-type electric actuator with a locking rod and a housing.

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

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

[0019] Figure 5 yes Figure 1 A schematic structural diagram of a push-lock structure of a push-type electric actuator.

[0020] Figure 6 Show Figure 5 The movement 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 The moving track of a locking protrusion in the pressing groove is shown.

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

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

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

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

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

[0028] Fig.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] Fig.15 yes Figure 3 Schematic diagram of the structure of the box cover.

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

[0031] Fig.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 Figure 1-Figure 4 As shown, a push-type electric actuator according to a preferred embodiment of the present invention comprises a box body 1, a box cover 2, a locking rod 3, a sleeve 4 and a spring 5, wherein the box body 1 and the box cover 2 are fixedly connected to form a housing, and the locking rod 3 is rotatably and liftably mounted on the housing 1 through the sleeve 4 and the spring 5. Specifically, the sleeve 4 is accommodated and mounted at the bottom of the locking rod 3, the box body 1 has a protrusion 1a for limiting the spring 5, and the spring 5 is arranged between the box body 1 and the sleeve 4 to push the locking rod 3 through the 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, wherein 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, see Figure 3 , the locking protrusion 31 is formed on the outer wall of the locking rod 3, 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 prior art that requires the additional introduction of a slot block, 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 block, has fewer parts, and is simpler in structure, manufacturing and assembly, thereby solving the problems of difficult manufacturing, assembly and control of the track groove in the prior art and high cost.

[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 motion 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 continuously, and the lock protrusion 31 contacts the first track groove 11 along the second path B, and the lock rod 3 moves downward while rotating clockwise to overcome 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 lock rod 3 is manually pressed, and the lock projection 31 moves downward along the fifth path E to overcome the spring force of the spring 5; the lock rod 3 is manually pressed again, and the lock projection 31 contacts the first track groove 11 along the sixth path F, and the lock rod 3 moves downward while overcoming the spring force of the spring 5 while rotating clockwise; the lock rod 3 is released, and the lock projection 31 moves upward along the seventh path G under the spring force of the spring 5; the lock rod 3 is released, and the lock projection 31 contacts the second track groove 21 along the eighth path H, and the lock rod 3 moves upward under the spring force of the spring 5 while rotating clockwise to exit the motion track. It should be understood that the clockwise rotation here is only an example and not a limitation, and its 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 movement track of the second track groove 21 in the pressing groove from locking to unlocking 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, such as Fig. 9 As shown, the heights of the two points I and J of 180° of a first track groove 11 are consistent, ensuring that the next 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°, such as 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°, such as 23°) with the horizontal plane, see Fig.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 any time, reducing unnecessary wear on the locking protrusion 31. It should be understood that the two locking protrusions here are only used as 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 used as an example and not a limitation, in order to reduce wear, and the vertical surface (smooth surface with a fixed angle) has no functional impact.

[0037] Back to Figure 1-Figure 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 locking rod 3 to realize the electric locking of the locking rod 3. Specifically, in combination with Figure 11-13 The transmission mechanism 7 includes a first-stage transmission 7a and a second-stage transmission 7b. The first-stage transmission 7a includes an inner gear ring 71, a sun gear 72, a planetary gear 73 and a planetary carrier 74. The second-stage transmission 7b includes a planetary carrier 74 and a rack 75 with a gear structure. The inner gear ring 71 is fixedly installed inside the housing above the motor 6. The sun gear 72 is interference-mounted on the output shaft of the motor 6. The planetary gear 73 is installed on the planetary carrier 74 and meshes with the inner gear ring 71 and the sun gear 72 respectively. The rack 75 meshes with the planetary carrier 74 with a gear structure to be inserted into the lock hole of the lock rod 3 under the drive of the motor 6, so as to limit the lifting and lowering movement of the lock rod 3 by electric locking in the mechanical locking position of the lock rod 3. Specifically, when the motor 6 is powered on, the sun gear 72 drives the planetary gear 73 to rotate, and the planetary carrier 74 drives the lock tongue of the matching rack 75 to enter the lock hole of the lock rod 3. In particular, the inner gear ring 71 has a soft rubber stop point 711, which serves as the first contact point in the electric locking function to reduce hard contact. It can be understood that the soft rubber stop point 711 is only an additional function, and the locking function can also be achieved by removing the soft stop point. Obviously, the transmission mechanism 7 of the present invention is a planetary gear train structure, which has a high locking force / locking force and unlocking force in a limited space, thereby solving the problem of insufficient locking force / locking force of the small motor 6 in the prior art, and realizing electric locking and unlocking in extreme conditions such as high temperature and low pressure.

[0038] Back to Figure 1-Figure 4 According to a preferred embodiment of the present invention, the push-type electric actuator also includes an emergency unlocking structure, which is composed of a winding wheel 8 and an emergency pull rope 9. Specifically, the planet carrier 74 extends through the box cover 2, the winding wheel 8 is installed on the extended end of the planet carrier 74, and the emergency pull rope 9 is fixedly installed 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 used as an example and not a limitation, and other assembly methods are also feasible, such as gluing. Fig.14As shown, the emergency pull rope 9 is manually pulled to rotate the winding wheel 8. Since the winding wheel 8 and the planetary frame 74 are connected together by a buckle, the planetary frame 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 a small force value emergency unlocking can be achieved with the help of the planetary frame 74 with a larger radius. 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 limit, and the force will not be transmitted to the inside of the planetary gear system.

[0039] like Fig.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 planet 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 through the connecting structure 243, reducing the manufacturing complexity, reducing the assembly complexity, and achieving a high level of dust and water resistance. In this embodiment, the above-mentioned stop 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 realizes IP67 and above waterproofing of the entire system.

[0040] The following briefly describes the assembly process of the push-type electric actuator according to the present invention. Fig.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, then assemble the planetary carrier 74 and the rack 75, at this time the electric locking component is installed, then assemble the spring 5 and the sleeve 4, 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. Fig.17As shown, in the first state of mechanical unlocking and electric unlocking, the lock rod 3 is at an absolute circumferential position of 0°. When 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 14 mm and rotates by 90°. The locking piece 32 on the lock rod 3 engages with the door panel, and the mechanical locking is in the second state. At this time, it is still in the electric unlocking position, and the lock rod 3 is in an absolute circumferential position of 90°. When the motor 6 is powered on, the planetary gear 73 and the planetary carrier 74 drive the rack 75 to move, move left for electric locking, and complete the whole set of locking movements in the third state. At this time, it is in the mechanical locking and electric locking position, and the lock rod 3 is in an absolute circumferential position of 90°. When the motor 6 is powered on, the planetary gear 73 and the planetary carrier 74 drive the rack 75 to move, move right for electric unlocking, and complete the electric unlocking in the fourth state. When the lock rod 3 is pressed down, the lock rod 3 moves downward and rotates. In this embodiment, after descending 3 mm and rotating 90°, the locking piece 32 on the locking rod 3 and the door panel are disengaged, and mechanical unlocking is performed. The whole set of unlocking movement is completed and the locking rod 3 is in the fourth state. At this time, the locking rod 3 is in an absolute circumferential position of 180°.

[0042] The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The above embodiment of the present invention can also be modified in various ways. That is, all simple, equivalent changes and modifications made according to the claims and the description of the present invention fall within the scope of protection of the claims of the present invention. The contents not described in detail in the present invention are all conventional technical contents.

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 also includes a sleeve and a spring, wherein the sleeve is accommodated and installed at the bottom of the lock rod, and the spring is arranged between the box body and the sleeve to push the lock 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 grooves correspond to n motion tracks from locking to unlocking, and each locking protrusion limits the cyclic rotation of the locking rod in the circumferential direction through the continuous n motion tracks.

4. The push-type electric actuator according to claim 3, characterized in that: The starting point and the 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 descending 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 ascending 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 respectively helical surfaces.

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 installed inside the housing above the motor, the sun gear is installed on the output shaft of the motor, the planetary gears are installed 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 in the mechanical locking position of the locking rod.

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 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 extended end of the planetary carrier, the emergency pull rope is fixedly installed on the winding wheel, and the winding wheel is connected to the transmission mechanism on the box cover to reversely drive the rack to realize 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 so as to be clamped in the body to prevent it from falling off.

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