Electric push rod actuator with eccentric connecting rod structure

Abstract

The invention discloses an electric push rod actuator with an eccentric connecting rod structure. The electric push rod actuator comprises a shell, a motor, a worm, a gear, a linkage rod and an execution push rod, 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 present invention relates to the technical field of a push rod actuator, and in particular to an electric push rod actuator with an eccentric connecting rod structure, which is mainly used near a glove box, a storage box, etc. of a car and is used to push a corresponding lock structure to unlock the car. Background Art

[0002] Electric push rod actuators are increasingly used in vehicles, especially in improving user experience and convenience. For example, in the vehicle's glove box, seat adjustment, tailgate opening, and sunroof control systems, electric push rod actuators have become an indispensable key component with their precise control, low noise, and high efficiency.

[0003] For the glove box, the electric push rod actuator precisely controls its opening and closing, allowing drivers and passengers to easily access the storage space while keeping the interior neat and elegant. This application not only improves the convenience of the car, but also increases the vehicle's sense of technology through electrified operation.

[0004] Patent documents such as US8752869B2, CN106460417A, CN104847190A, CN114502811A, CN213442310U, and CN213144174U all disclose electric push rod actuators. And the technical solutions of these electric push rod actuators all have one thing in common, that is, through the transmission of worms, worm wheels, multi-stage gears and racks, the rotational motion of the motor is finally converted into linear motion, thereby driving the door lock system. Therefore, there are the following two problems in these structures: first, the transmission efficiency of the multi-stage transmission is low, which increases the probability of failures such as jamming; second, the push rod cannot be reset after being pushed out.

[0005] The second problem is generally solved by a reset assembly C connected between the push rod A and the housing B, such as Figure 1 As shown in the figure, when the motor is powered on, the worm and gear drive the push rod to move forward efficiently. During this process, the reset component always exerts a reverse thrust on the push rod. When the force of the reset component is greater than the transmission force of the motor, the push rod will be pulled back by the reset component to achieve the reset function.

[0006] However, there is a significant problem with the above-mentioned push rod actuator in practical applications: when the push rod is pushed back and reset by the reset component, if the motor is still powered on, the reverse push of the reset component will cause the motor to be forced to stop or even reverse. This situation will not only cause the motor to overload and heat up, reducing its working efficiency, but also cause wear and tear on the internal structure of the motor, thus seriously affecting the service life of the motor. In the long run, this may cause the performance of the electric push rod actuator to decline, or even cause failures, affecting the overall performance of the vehicle and user experience. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an electric push rod actuator with an eccentric connecting rod structure which can avoid overload heating caused by forced stopping and reversing of the motor.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an electric push rod actuator with an eccentric connecting rod structure includes a shell and a motor, a worm, a gear, a connecting rod and an actuator push rod in the shell; the shell has a push rod hole for the actuator push rod to extend out; the output shaft of the motor is connected to the worm; the gear is meshed with the worm; an eccentric column is provided 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 actuator push rod; the front end of the actuator 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.

[0009] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: the worm and the actuator push rod are parallel to each other, and the actuator push rod is located in the front side of the worm, and the extension direction of the worm is consistent with the movement direction of the actuator push rod; a return spring is arranged on the actuator push rod, and when the motor stops, the return spring puts the actuator push rod in an initial state of not extending.

[0010] The preferred technical solution adopted by the present invention to solve the above technical problem is: the reset spring is a tension spring, and the two ends of the tension spring are respectively connected to the rear end of the actuator push rod and the inner wall of the shell.

[0011] The preferred technical solution adopted by the present invention to solve the above technical problem is: a connecting portion is provided on the lower side of the rear end of the actuator push rod, a hook portion is provided on the shell, and both ends of the reset spring are connected between the connecting portion and the hook portion.

[0012] The preferred technical solution adopted by the present invention to solve the above technical problems is: 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 to keep the worm and the output shaft of the motor on the same axis, and a silent elastic sleeve is provided at the front end of the actuator push rod.

[0013] The preferred technical solution adopted by the present invention to solve the above technical problem is: a linear spring groove is provided on the inner side of the shell, and the return spring is arranged in the linear spring groove so that its stretching and return movement can remain linear.

[0014] Another technical solution adopted by the present invention to solve the above technical problems is: an electric push rod actuator with an eccentric connecting rod structure, comprising a housing and a motor, a worm, a gear, a connecting rod and an executing push rod in the housing; the housing has a push rod hole for the executing push rod to extend; the output shaft of the motor is connected to the worm; the gear is meshed with the worm; an eccentric column is arranged 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 executing push rod; the front end of the executing push rod extends out of the push rod hole; the output shaft of the motor drives the executing push rod to perform forward and backward linear motion along the push rod hole through the transmission of the worm, the gear and the connecting rod; the worm and the executing push rod are parallel to each other, and the executing 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 executing push rod; a reset spring is arranged on the executing push rod, and the two ends of the reset spring are respectively connected to the rear end of the executing push rod and the inner wall of the housing; when the motor stops, the tension of the reset spring can make the executing push rod in an initial state of not extending.

[0015] The preferred technical solution adopted by the present invention to solve the above technical problem is: a connecting portion is provided on the lower side of the rear end of the actuator push rod, a hook portion is provided on the shell, and both ends of the reset spring are connected between the connecting portion and the hook portion.

[0016] The preferred technical solution adopted by the present invention to solve the above technical problem is: a linear spring groove is provided on the inner side of the shell, and the return spring is arranged in the linear spring groove so that its stretching and return movement can remain linear.

[0017] The preferred technical solution adopted by the present invention to solve the above technical problem is: 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 to keep the worm and the output shaft of the motor on the same axis.

[0018] The preferred technical solution adopted by the present invention to solve the above technical problem is: a silent elastic sleeve is provided at the front end of the actuator push rod.

[0019] Compared with the prior art, the advantages of the present invention are: only one stage of gears that cooperate with the worm is provided, and reciprocating motion is achieved through an eccentric connecting rod. This design greatly simplifies the transmission structure, reduces the loss of energy during the transmission process, and thus significantly improves the transmission efficiency. In practical applications, the advantages of this structural simplification are particularly obvious. Since the intermediate transmission links are reduced, the electric push rod actuator with an eccentric connecting rod structure has a faster response speed and can execute control instructions more accurately. At the same time, due to the improvement in transmission efficiency, the electric push rod actuator with an eccentric connecting rod structure can generate greater thrust at the same power, thereby meeting the needs of more diverse application scenarios.

[0020] During the actuator response time, the motor continues to run in the same direction and the push rod reciprocates. The reciprocating force of the push rod comes from the motor. Therefore, the motor in traditional technology will not be overloaded due to excessive reverse force, thereby protecting the stability of the motor and surrounding electronic components and increasing the service life of the entire actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

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

[0023] Figure 2 is an internal structure diagram of an electric push rod actuator with an eccentric connecting rod structure in a preferred embodiment;

[0024] Figure 3 It is a schematic diagram of a push rod retracting state of an electric push rod actuator with an eccentric connecting rod structure in a preferred embodiment;

[0025] Figure 4 It is a schematic diagram of a push rod extension state of an electric push rod actuator with an eccentric connecting rod structure in a preferred embodiment;

[0026] Figure 5 1 is an exploded view of an electric push rod actuator with an eccentric connecting rod structure in a preferred embodiment.

[0027] Reference numerals:

[0028] Push rod A, housing B, reset assembly C;

[0029] Housing 1; motor 2; worm 3; gear 4; connecting rod 5; actuator 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; boss 62; linear spring groove 11; rotating shaft m; gear support seat n; support seat 8. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the invention product is usually placed when in use, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. "First" and "second" are only for the purpose of making the description easier to understand, without any other directional meaning, and cannot be used as a limitation on the present invention.

[0032] like Figure 1-5 As shown, this embodiment provides an electric push rod actuator with an eccentric connecting rod structure, including a housing 1 and a motor 2, a worm 3, a gear 4, a connecting rod 5 and an actuator push rod 6 in the housing 1. Preferably, the housing 1 includes a bottom shell 101 and an upper cover 102, and the bottom shell 101 and the upper cover 102 are connected by a snap-fit ​​structure or screws; a plurality of mounting parts are provided on the outer side of the housing, and the mounting parts have mounting holes k.

[0033] The output shaft of the motor 2 is connected to the worm 3, the gear 4 is meshed with the worm 3, an eccentric column r is provided on the end face of the gear 4, 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 actuator push rod 6; the front end of the actuator push rod 6 extends out of the orifice of the push rod hole s.

[0034] like Figure 3 , 4 As shown, when the motor 2 is started, its output shaft drives the worm 3 to rotate, and the worm 3 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 is 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 actuator push rod 6, thereby converting the swing into the linear motion of the actuator push rod 6. The housing 1 has a push rod hole s for the actuator push rod 6 to extend. Finally, the output shaft of the motor is transmitted through the worm 3, the gear 4 and the connecting rod 5, driving the actuator push rod 6 to move forward and backward along the push rod hole s.

[0035] Compared with the mode of realizing linear motion by cooperating with multi-stage gears 4 and racks in traditional technology, the electric push rod actuator with an eccentric connecting rod structure adopts a simpler design scheme. Specifically, it only sets up a first-stage gear 4 that cooperates with the worm 3, and realizes reciprocating motion through an eccentric connecting rod 5. This design greatly simplifies the transmission structure and reduces the loss of energy during the transmission process, thereby significantly improving the transmission efficiency. In practical applications, the advantages of this structural simplification are particularly obvious. Due to the reduction of intermediate transmission links, the electric push rod actuator with an eccentric connecting rod structure has a faster response speed and can execute control instructions more accurately. At the same time, due to the improvement of transmission efficiency, the electric push rod actuator with an eccentric connecting rod structure can generate greater thrust at the same power, thereby meeting the needs of more diverse application scenarios.

[0036] And based on the actuator reaction time, after the motor is started and the push rod has been pushed outward, the motor will still run for at least 1 second, and the motor will run multiple times within this 1 second. In the traditional technology, the final rack or final worm 3 is connected to the actuator push rod 6, and its own driving mode is unidirectional linear motion. The return of the actuator push rod 6 depends 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 in the driven state, so an overload phenomenon will occur.

[0037] In the technical solution of this embodiment, during the actuator reaction time, the motor continues to run in the same direction, the push rod reciprocates, and the reciprocating force of the actuator push rod 6 comes from the motor. Therefore, the motor will not be overloaded due to excessive reverse force in the above situation, thereby protecting the stability of the motor and peripheral electronic components and improving the service life of the entire actuator.

[0038] Furthermore, if Figure 5 As shown, a return spring 7 is arranged on the actuator push rod 6. The return spring 7 is used to pull the actuator push rod 6 back by mechanical force to an initial state of not extending when the motor stops due to power failure or when the motor stops actively. It should be noted that the force of the return spring 7 is much smaller than the external thrust of the linkage rod 5 on the actuator push rod 6 in the motor driving state.

[0039] In the present embodiment, the reset spring 7 is a tension spring, and the two ends of the tension spring are respectively connected to the rear end of the actuator push rod 6 and the inner wall of the housing 1. When the external force applied to the linkage rod 5 is removed, the tension spring begins to exert a pulling force on the actuator push rod 6 by virtue of its elastic recovery characteristics. It is particularly worth mentioning that since the linkage rod 5 adopts an eccentric rotation structure, this design cleverly 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 linkage rod 5, thereby driving the actuator push rod 6 to perform a pulling action. This beneficial effect not only significantly reduces the requirements for 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] like Figure 1-4 As shown, the worm 3 and the actuator push rod 6 are parallel to each other, and the actuator push rod 6 is located in front of the worm 3, and the extension direction of the worm 3 is consistent with the movement direction of the actuator push rod 6. It is particularly noteworthy that the actuator push rod 6 is placed in front of the worm 3. This layout 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 actuator push rod 6 not only ensures the continuity and accuracy of the power transmission, but also enables the entire mechanism to maintain the best mechanical state during the movement process, ensuring the stability and consistency of the two during the movement process, but also greatly simplifies the complexity of the mechanism and reduces unnecessary energy loss.

[0041] like Figure 5 As shown, a protruding column 62 is provided on the upper side of the rear end of the actuator push rod 6, and a connecting hole 51 is provided on the front end of the linkage rod 5. The connecting hole 51 and the protruding column 62 cooperate to realize the rotation connection between the two.

[0042] A connecting portion 61 is provided at the lower rear end of the actuator push rod 6, a hook portion is provided on the housing 1, and both ends of the return spring 7 are connected between the connecting portion 61 and the hook portion. This design not only ensures the stability of the structure, but also lays a solid foundation for subsequent assembly, maintenance and function realization.

[0043] like Figure 5 As shown, the connecting portion 61 protrudes downward, a hook hole is provided on the connecting portion 61, and curved hooks are provided at both ends of the reset spring 7, which are respectively hooked on the hook hole and the hook portion to achieve connection, thereby making assembly easier.

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

[0045] like Figure 5 As shown, a rotating shaft m for mounting the gear 4 and a gear support seat n are disposed in the housing 1 , thereby providing a stable mounting position for mounting the gear 4 , and a linear spring groove 11 is located at one side of the gear support seat and below the gear 4 .

[0046] like Figure 2 As shown, the front end of the worm 3 is provided with a support seat 8, and the shaft portion 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 portion of the front end of the worm 3 accurately 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 the transmission process and improving the overall transmission efficiency and stability.

[0047] like Figure 5 As shown, the front end of the actuator push rod 6 is provided with a silent elastic sleeve t, which is embedded in the annular groove. Its buffering and shock absorption capabilities are further enhanced. The existence of the silent elastic sleeve can effectively absorb and isolate the noise and vibration generated during the transmission process, providing users with a quieter and more comfortable use experience. At the same time, it can also protect the actuator push rod 6 from external impact and wear to a certain extent, extending its service life.

[0048] The above is an introduction to the electric push rod actuator with an eccentric connecting rod structure provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electric push rod actuator with an eccentric connecting rod structure, 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 through which the push rod can be extended; The output shaft of the motor is connected to the worm; the gear is meshed with the worm; An eccentric column is provided on the end surface 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 to the rear end of the actuator push rod; the front end of the actuator 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, gears and connecting rod.

2. The electric push rod actuator with an eccentric connecting rod structure 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 actuator push rod is provided with a return spring, and when the motor stops, the return spring makes the actuator push rod be in an initial state of not extending.

3. The electric push rod actuator with an eccentric connecting rod structure according to claim 2, characterized in that: The return spring is a tension spring, and two 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 electric push rod actuator with an eccentric connecting rod structure according to claim 2, characterized in that: A connecting portion is provided at the lower side of the rear end of the actuator push rod, a hook portion is provided on the housing, and two ends of the reset spring are connected between the connecting portion and the hook portion.

5. The electric push rod actuator with an eccentric connecting rod structure according to claim 1, 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. A silent elastic sleeve is provided at the front end of the actuator push rod.

6. The electric push rod actuator with an eccentric connecting rod structure 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 the stretching and return movements of the return spring can be kept linear.

7. The electric push rod actuator with an eccentric connecting rod structure is 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 through which the push rod can be extended; The output shaft of the motor is connected to the worm; the gear is meshed with the worm; An eccentric column is provided on the end surface 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 to the rear end of the actuator push rod; the front end of the actuator 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 electric push rod actuator with an eccentric connecting rod structure according to claim 7, characterized in that: A connecting portion is provided at the lower side of the rear end of the actuator push rod, a hook portion is provided on the housing, and two ends of the reset spring are connected between the connecting portion and the hook portion.

9. The electric push rod actuator with an eccentric connecting rod structure 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 the stretching and return movements of the return spring can be kept linear.

10. The electric push rod actuator with an eccentric connecting rod structure according to claim 7, characterized in that: A support seat is provided at the front end of the worm, and the shaft portion at 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 electric push rod actuator with an eccentric connecting rod structure according to claim 7, characterized in that: A silent elastic sleeve is arranged at the front end of the execution push rod.

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