Anti-overloading electric push rod actuator

Abstract

The utility model discloses an anti-overloading electric push rod actuator which comprises a shell, a motor, a worm, a gear, a linkage rod and an execution push rod, wherein the motor, the worm, the gear, the linkage rod and the execution push rod are arranged in the shell. The shell is provided with a push rod hole for the execution push rod to extend out; an output shaft of the motor is connected with the worm; the gear is meshed with the worm; an eccentric column is arranged on the end face of the gear, and the eccentric column is sleeved with the first end of the linkage rod. The second end of the linkage rod is connected to the rear end of the execution push rod; the front end of the execution push rod extends out of the push rod hole; the output shaft of the motor drives the execution push rod to linearly move back and forth along the push rod hole through transmission of the worm, the gear and the linkage rod. The transmission mechanism has the advantages that the transmission structure is simplified, and the loss of energy in the transmission process is reduced, so that the transmission efficiency is remarkably improved; and in the response time of the actuator, the reciprocating acting force of the execution push rod comes from the motor under the condition that the motor continuously runs in the same direction, so that the overload condition is avoided, the stability of the motor and peripheral electronic devices is protected, and the service life of the whole actuator is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric push rod actuators, especially to an anti-overload electric push rod actuator mainly used near glove boxes, storage boxes and the like of a vehicle to unlock corresponding lock structures. BACKGROUND

[0002] Electric push rod actuators are increasingly widely used in vehicles, particularly in improving user experience and convenience. For example, in glove boxes, seat adjustment, tailgate opening, sunroof control and other systems of vehicles, electric push rod actuators, with their precise control, low noise and high efficiency, have become indispensable key components.

[0003] For glove boxes, electric push rod actuators precisely control their opening and closing actions, allowing drivers and passengers to easily access storage space while maintaining the neatness and elegance of the interior. This application not only improves the convenience of the vehicle, but also increases the technological feel of the vehicle through electric operation.

[0004] US8752869B2, CN106460417A, CN104847190A, CN114502811A, CN213442310U, CN213144174U all disclose electric push rod actuators. The technical solutions of these electric push rod actuators are all in one commonality, i.e. through the transmission of worm, worm gear, multi-stage gear and rack, the rotary motion of the motor is finally converted into linear motion to drive the door locking system. Therefore, there are two problems in these structures: first, the multi-stage transmission has low transmission efficiency, increasing the probability of jamming and other failures; second, the push rod cannot be reset after being pushed out.

[0005] For the second problem, a reset component C is usually connected between the push rod A and the shell B to solve it, as shown in Figure 1 When the motor is powered on, the worm and gear transmission can efficiently drive the push rod to move forward. During this process, the reset component always has a backward pulling force on the push rod. When the force of the reset component is greater than the motor transmission force, the push rod will be pulled back by the reset component to achieve the reset function.

[0006] However, the push rod actuator described above has a significant problem in practical application: when the push rod is reset by the reset assembly, if the motor is still in the energized state, the reset assembly will cause the motor to stop rotating or even reverse. This not only causes the motor to overheat and reduces its efficiency, but also causes wear and tear to the internal structure of the motor, which seriously affects the service life of the motor. In the long run, this may cause the performance of the electric push rod actuator to decline, even cause failure, and affect the overall performance and user experience of the vehicle. Utility model content

[0007] The technical problem to be solved by the utility model is to provide an electric push rod actuator that can avoid the overheating caused by the forced stop and reverse rotation of the motor.

[0008] The utility model provides a kind of electric push rod actuator of anti-overload, including shell and the motor in shell, worm, gear, linkage rod and execution push rod;The shell has a push rod hole that can be used for execution push rod to extend;The output shaft of the motor is connected worm;The gear is engaged with the worm;Eccentric column is equipped on the end face of the gear, and the first end of the linkage rod is sleeved on the eccentric column;The second end of the linkage rod is connected at the rear end of the execution push rod;The front end of the execution push rod extends the push rod hole;The output shaft of the motor is transmitted by worm, gear and linkage rod, drives the execution push rod to carry out linear motion back and forth along push rod hole.

[0009] The preferred technical solution for solving the above technical problem is that the worm and the execution push rod are parallel to each other, and the execution push rod is located at the front side of the worm, and the extension direction of the worm is consistent with the movement direction of the execution push rod.

[0010] The preferred technical solution for solving the above technical problem is that the reset spring is a tension spring, and the two ends of the tension spring are connected to the rear end of the execution push rod and the inner wall of the shell, respectively.

[0011] The preferred technical solution for solving the above technical problem is that the rear end of the execution push rod is provided with a connecting portion, the shell is provided with a hook portion, and the two ends of the reset spring are connected between the connecting portion and the hook portion.

[0012] The preferred technical solution for solving the above technical problem is that the front end of the worm is provided with a support seat, the shaft portion of the front end of the worm extends into the support seat, so that the worm and the output shaft of the motor are kept on the same axis, and the front end of the execution push rod is provided with a silent elastic sleeve.

[0013] The utility model discloses a preferred technical scheme for solving the above technical problem: the inside of the shell is provided with a linear spring groove, and the reset spring is arranged in the linear spring groove to keep the stretching and reset movement of the reset spring straight.

[0014] The utility model discloses another technical scheme for solving the above technical problem: an anti-overload electric push rod executor, which comprises a shell, a motor, a worm, a gear, a connecting rod and an execution push rod in the shell; the shell has a push rod hole for the execution push rod to extend out of; the output shaft of the motor is connected with the worm; the gear is engaged with the worm; an eccentric column is arranged on the end face of the gear, and the first end of the connecting rod is sleeved on the eccentric column; the second end of the connecting rod is connected to the rear end of the execution push rod; the front end of the execution push rod extends out of the push rod hole; the output shaft of the motor drives the execution push rod to move straight forward and backward along the push rod hole through the transmission of the worm, the gear and the connecting rod; the worm and the execution push rod are parallel to each other, and the execution push rod is located at the front side of the worm; the extension direction of the worm is consistent with the movement direction of the execution push rod; a reset spring is arranged on the execution push rod, and the two ends of the reset spring are connected to the rear end of the execution push rod and the inner wall of the shell respectively; when the motor stops, the pulling force of the reset spring can make the execution push rod be in the initial state of not extending out.

[0015] The utility model discloses a preferred technical scheme for solving the above technical problem: a connecting part is arranged on the lower side of the rear end of the execution push rod, and the shell has a hook part; the two ends of the reset spring are connected between the connecting part and the hook part.

[0016] The utility model discloses a preferred technical scheme for solving the above technical problem: the inside of the shell is provided with a linear spring groove, and the reset spring is arranged in the linear spring groove to keep the stretching and reset movement of the reset spring straight.

[0017] The utility model discloses a preferred technical scheme for solving the above technical problem: the front end of the worm is provided with a bearing seat, and the shaft part of the front end of the worm extends into the bearing seat to keep the worm and the output shaft of the motor on the same axis.

[0018] The utility model discloses a preferred technical scheme for solving the above technical problem: the front end of the execution push rod is provided with a mute elastic sleeve.

[0019] Compared with the prior art, the utility model has the advantages that: only one gear matched with the worm is arranged, and reciprocating motion is realized through the eccentric connecting rod. This design greatly simplifies the transmission structure, reduces the loss of energy in the transmission process, and thus significantly improves the transmission efficiency. In actual application, the advantages of this structure simplification are particularly obvious. Due to the reduction of intermediate transmission links, the response speed of the anti-overload electric push rod actuator is faster, and the control instruction can be more accurately executed. At the same time, due to the improvement of transmission efficiency, the anti-overload electric push rod actuator can generate greater thrust under the same power, thereby meeting the needs of more diversified application scenarios.

[0020] In the motor continuous same direction operation state within the actuator reaction time, the push rod realizes reciprocation, and the reciprocating force of the push rod is all from the motor, so that the overload condition of the motor caused by the excessive reverse force in the traditional technology does not appear, thereby protecting the stability of the motor and the surrounding electronic devices, and improving the service life of the whole actuator. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further described in detail below in combination with the drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the utility model. In addition, unless specifically indicated, the drawings only schematically show the composition or structure of the described objects conceptually and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0022] Figure 1 It is a schematic diagram of the electric push rod actuator in the background art;

[0023] Figure 2 It is an internal structure diagram of the anti-overload electric push rod actuator in the preferred embodiment;

[0024] Figure 3 It is a push rod retraction state schematic diagram of the anti-overload electric push rod actuator in the preferred embodiment;

[0025] Figure 4 It is a push rod extension state schematic diagram of the anti-overload electric push rod actuator in the preferred embodiment;

[0026] Figure 5 It is an explosion diagram of the anti-overload electric push rod actuator in the preferred embodiment.

[0027] REFERENCE SIGNS:

[0028] Push rod A, shell B, reset component C;

[0029] Housing 1; motor 2; worm 3; gear 4; connecting rod 5; execution push rod 6; bottom shell 101; upper cover 101; mounting hole k; eccentric column r; push rod hole s; return spring 7; connecting part 61; connecting hole 51; convex column 62; straight spring groove 11; rotating shaft m; gear support seat n; support seat 8. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present application will be described in detail below with reference to the drawings. Those skilled in the art will appreciate that the description is merely illustrative, exemplary, and should not be construed as limiting the scope of the present application.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed during use, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. The terms "first", "second" are only for the convenience of understanding and have no other directional meaning, and cannot be construed as limiting the present application.

[0032] As shown in Figures 1-5 The present embodiment provides an anti-overload electric push rod actuator, which comprises a housing 1 and a motor 2, a worm 3, a gear 4, a connecting rod 5 and an execution push rod 6 in the housing 1. Preferably, the housing 1 comprises a bottom shell 101 and an upper cover 101, and the bottom shell 101 and the upper cover 102 are connected by a buckle structure or connected by screws; the outer side of the housing is provided with a plurality of mounting parts, and the mounting parts are provided with mounting holes k.

[0033] The output shaft of the motor 2 is connected to the worm 3, the gear 4 is engaged with the worm 3, an eccentric column r is arranged on the end face of the gear 4, and the first end of the connecting rod 5 is sleeved on the eccentric column r; the second end of the connecting rod 5 is connected to the rear end of the execution push rod 6; the front end of the execution push rod 6 protrudes out of the orifice of the push rod hole s.

[0034] As shown in Figure 3 , 4As shown, when the motor 2 starts, its output shaft drives the worm 3 to rotate, and the worm 3 in turn drives the gear 4 to rotate. Since the eccentric column r on the end face of the gear 4 is sleeved with the connecting rod 5, the rotation of the gear 4 will be converted into the reciprocating swing of the connecting rod 5. The second end of the connecting rod 5 is connected to the rear end of the execution push rod 6, so as to convert the swing into the linear motion of the execution push rod 6. The shell 1 has a push rod hole s for the execution push rod 6 to extend out. Finally, the output shaft of the motor drives the execution push rod 6 to move linearly forward and backward along the push rod hole s through the transmission of the worm 3, the gear 4 and the connecting rod 5.

[0035] Compared with the mode of realizing linear motion by multi-stage gear 4 and rack cooperation in the prior art, the anti-overload electric push rod actuator adopts a more simple design scheme. Specifically, it only sets one stage of gear 4 cooperating with the worm 3, and realizes reciprocating motion through the eccentric connecting rod 5. This design greatly simplifies the transmission structure, reduces the energy loss in the transmission process, and thus significantly improves the transmission efficiency. In practical application, the advantage of structure simplification is particularly obvious. Since the intermediate transmission link is reduced, the response speed of the anti-overload electric push rod actuator is faster, and it can more accurately execute the control instruction. At the same time, due to the improvement of transmission efficiency, the anti-overload electric push rod actuator can generate greater thrust under the same power, thereby meeting the needs of more diversified application scenarios.

[0036] And based on the actuator reaction time, the motor will still run for at least 1 second after the push rod has been pushed out after the motor starts, and during this 1 second, the motor will run multiple times. In the prior art, the last-stage rack or the last-stage worm 3 is connected with the execution push rod 6, and the driving mode thereof is one-way linear motion, and the return of the execution push rod 6 relies on the elasticity of the tension spring. When the spring force is greater than the transmission force of the motor 2, the push rod will be pushed back by the spring. Therefore, in this process, the motor 2 will be forced to stop or passively forced to reverse under the driven state, and thus the overload phenomenon will occur.

[0037] In the technical scheme of the embodiment, during the motor continuous same-direction running state within the actuator reaction time, the push rod realizes reciprocation, and the reciprocating force of the execution push rod 6 all comes from the motor, so the overload situation caused by the motor being subjected to excessive reverse force in the above-mentioned situation will not occur, thereby protecting the stability of the motor and the surrounding electronic devices, and improving the service life of the entire actuator.

[0038] Further, as shown in the figure, Figure 5 A reset spring 7 is arranged on the execution push rod 6, and the reset spring 7 is used to pull back the execution push rod 6 by mechanical force when the motor stops due to loss of power supply or the motor actively stops after power-off, so that the execution push rod 6 is in the initial state of not extending out. It should be noted that the force of the reset spring 7 is much smaller than the outward pushing force of the connecting rod 5 on the execution push rod 6 under the driving state of the motor.

[0039] In the present embodiment, the reset spring 7 is a tension spring, and the two ends of the tension spring are connected to the rear end of the execution push rod 6 and the inner wall of the shell 1, respectively. When the external force applied to the connecting rod 5 is removed, the tension spring starts to exert a pulling force on the execution push rod 6 by virtue of the elastic recovery property. It is particularly worth mentioning that, due to the eccentric rotation structure of the connecting rod 5, this design ingeniously amplifies the effect of the smaller force of the tension spring. Under the action of this eccentric rotation mechanism, even the relatively small pulling force provided by the tension spring can be effectively amplified through the lever effect of the connecting rod 5, so as to drive the execution push rod 6 to perform the pulling action. This beneficial effect not only significantly reduces the requirement for the size of the elastic force of the tension spring, avoids the influence of the elastic force on the motor during the operation of the motor, but also improves the response speed and reset accuracy of the entire system.

[0040] As shown in Figures 1-4 , the worm 3 and the execution push rod 6 are parallel to each other, and the execution push rod 6 is located at the front side of the worm 3, and the extension direction of the worm 3 is consistent with the movement direction of the execution push rod 6. It is particularly worth noting that the execution push rod 6 is arranged at the front side of the worm 3, which not only makes the power transmission between the two more direct and efficient, but also optimizes the overall space utilization. The design that the extension direction of the worm 3 is consistent with the movement direction of the execution push rod 6 not only ensures the continuity and accuracy of power transmission, but also ensures the stability and consistency of the two during the movement process, greatly simplifies the complexity of the mechanism, and reduces unnecessary energy loss.

[0041] As shown in Figure 5 , the rear end of the execution push rod 6 is provided with a protruding column 62, and the front end of the connecting rod 5 is provided with a connecting hole 51, and the connecting hole 51 and the protruding column 62 cooperate to realize the rotary connection of the two.

[0042] The rear end of the execution push rod 6 is provided with a connecting part 61, and the shell 1 is provided with a hook part, and the two ends of the reset spring 7 are connected between the connecting part 61 and the hook part. This design not only ensures the stability of the structure, but also lays a solid foundation for subsequent assembly, maintenance and function realization.

[0043] As shown in Figure 5 , the connecting part 61 protrudes downward, the connecting part 61 is provided with a hook hole, and the two ends of the reset spring 7 are provided with a hook, and the hook is hooked on the hook hole and the hook part respectively to realize the connection, so that the assembly is more convenient.

[0044] Preferably, the inside of the shell 1 is provided with a linear spring groove 11, and the return spring 7 is arranged in the linear spring groove 11. The introduction of the linear spring groove 11 provides a precise and stable guide path for the return spring 7, ensuring that the return spring 7 always maintains a straight motion trajectory during the stretching and resetting motion, effectively avoiding the deviation and distortion of the spring during the motion.

[0045] As shown in Figure 5 , the inside of the shell 1 is provided with a rotating shaft m for mounting the gear 4 and a gear support seat n, thereby providing a mounting position for stably mounting the gear 4, and the linear spring groove 11 is located on one side of the gear support seat and below the gear 4.

[0046] As shown in Figure 2 , the front end of the worm 3 is provided with a support seat 8, and the shaft part of the front end of the worm 3 extends into the support seat 8, so that the worm 3 and the output shaft of the motor are kept on the same axis, which not only ensures the stability of the structure, but also provides precise support for the coaxial alignment of the worm 3 and the output shaft of the motor. The shaft part of the front end of the worm 3 precisely extends into the support seat 8, achieving perfect alignment of the worm 3 and the output shaft of the motor on the same straight line, thereby effectively reducing friction and loss during transmission and improving overall transmission efficiency and stability.

[0047] As shown in Figure 5 , the front end of the push rod 6 is provided with a silent elastic sleeve t, which is embedded in the annular groove. Further enhance its buffering and shock absorbing capacity. The presence of the silent elastic sleeve can effectively absorb and isolate the noise and vibration generated during transmission, providing users with a more quiet and comfortable use experience. At the same time, it can also protect the push rod 6 from external impact and wear to some extent, prolonging its service life.

[0048] The above describes a kind of anti-overload electric push rod actuator provided by the utility model, specific examples are applied in this paper to describe the principle and implementation mode of the utility model, the above embodiment is only used to help understanding the utility model and core idea.It should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

Claims

1. An overload-proof electric push rod actuator, characterized by: It includes a housing and a motor, a worm, a gear, a connecting rod and an actuator push rod in the housing; The housing has a push rod hole for the push rod to extend; The output shaft of the motor is connected to the worm; the gear is engaged with the worm; An eccentric column is provided on the end surface of the gear, and the first end of the connecting rod is sleeved on the eccentric column; The second end of the connecting rod is connected to the rear end of the execution push rod; the front end of the execution push rod extends out of the push rod hole; The output shaft of the motor drives the actuator push rod to move forward and backward along the push rod hole through the transmission of the worm, gear and connecting rod.

2. The overload-proof electric push rod actuator according to claim 1, characterized in that: The worm and the actuator push rod are parallel to each other, and the actuator push rod is located in front of the worm, and the extension direction of the worm is consistent with the movement direction of the actuator push rod; The execution push rod is provided with a return spring, and when the motor stops, the return spring keeps the execution push rod in an initial state where it is not extended.

3. The overload-proof electric push rod actuator according to claim 2, characterized in that: The return spring is a tension spring, and both ends of the tension spring are respectively connected to the rear end of the actuator push rod and the inner wall of the shell.

4. The overload-proof electric push rod actuator according to claim 2, characterized in that: A connecting portion is provided on the lower side of the rear end of the execution push rod, a hook portion is provided on the shell, and two ends of the reset spring are connected between the connecting portion and the hook portion.

5. The overload-proof electric push rod actuator according to claim 1, characterized in that: The front end of the worm is provided with a support seat, and the shaft portion of the front end of the worm extends into the support seat so that the worm and the output shaft of the motor are kept on the same axis. The front end of the actuator push rod is provided with a silent elastic sleeve.

6. The overload-proof electric push rod actuator according to claim 2, characterized in that: A linear spring slot is provided on the inner side of the housing, and the return spring is arranged in the linear spring slot so that its stretching and return movements remain linear.

7. An overload-proof electric push rod actuator, characterized in that: It includes a housing and a motor, a worm, a gear, a connecting rod and an actuator push rod in the housing; The housing has a push rod hole for the push rod to extend; The output shaft of the motor is connected to the worm; the gear is engaged with the worm; An eccentric column is provided on the end surface of the gear, and the first end of the connecting rod is sleeved on the eccentric column; The second end of the connecting rod is connected to the rear end of the execution push rod; the front end of the execution push rod extends out of the push rod hole; The output shaft of the motor drives the actuator push rod to move forward and backward along the push rod hole through the transmission of the worm, gear and connecting rod; The worm and the actuator push rod are parallel to each other, and the actuator push rod is located in front of the worm, and the extension direction of the worm is consistent with the movement direction of the actuator push rod; The actuator push rod is provided with a return spring, and the two ends of the return spring are respectively connected to the rear end of the actuator push rod and the inner wall of the housing; When the motor stops, the tension of the return spring can keep the actuator push rod in an initial state of not extending.

8. The overload-proof electric push rod actuator according to claim 7, characterized in that: A connecting portion is provided on the lower side of the rear end of the execution push rod, a hook portion is provided on the shell, and two ends of the reset spring are connected between the connecting portion and the hook portion.

9. The overload-proof electric push rod actuator according to claim 7, characterized in that: A linear spring slot is provided on the inner side of the housing, and the return spring is arranged in the linear spring slot so that its stretching and return movements remain linear.

10. The overload-proof electric push rod actuator according to claim 7, characterized in that: A support seat is provided at the front end of the worm, and the shaft portion of the front end of the worm extends into the support seat so that the worm and the output shaft of the motor are kept on the same axis.

11. The overload-proof electric push rod actuator according to claim 7, characterized in that: The front end of the execution push rod is provided with a silent elastic sleeve.

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