Electric latch actuator with high transmission efficiency

Abstract

The utility model discloses a high-transmission-efficiency electric latch actuator which comprises a base, a driving mechanism and an executing mechanism, and a guide groove is formed in the base. The driving mechanism comprises a motor, a screw rod and a nut, a shell of the motor is fixed to the base, the screw rod is coaxially fixed to an output shaft of the motor, and the screw rod is rotationally sleeved with the nut in a threaded mode; the executing mechanism comprises a sliding block and a lock rod, the sliding block is arranged in the guide groove in a sliding mode, one end of the sliding block is fixed to the nut, and the other end of the sliding block is fixedly connected with one end of the lock rod. The utility model has the beneficial effects that the rotation of the motor is converted into the movement of the lock rod through the matching of the screw rod and the nut, and compared with the existing transmission scheme that a worm gear and a worm are combined with a gear and a rack, the transmission efficiency is greatly improved, the structure is simpler, and the manufacturing cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive glove box locks, and particularly relates to a high transmission efficiency electric latch actuator. Background Art

[0002] An electric latch actuator is a device driven by electricity and is used to control the opening and closing of a latch. The high transmission efficiency electric latch actuator converts the rotational motion into linear motion through a series of transmission mechanisms by the power generated by an electric motor, so as to control the latch. It can quickly and accurately complete the opening and closing actions of the latch and is widely used in fields such as automobiles, furniture, and medical equipment.

[0003] The existing electric latch actuators usually adopt the transmission of worm and worm gear to drive the gear and rack to convert the force of the motor rotation into the output force. The transmission efficiency of the worm and worm gear is relatively low (generally 20% - 25%), and the whole transmission system requires more parts, the internal structure is more complex, which increases the manufacturing difficulty and the cost is relatively high. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above technical deficiencies, and propose a high transmission efficiency electric latch actuator to solve the technical problems of relatively low transmission efficiency, complex internal structure and high manufacturing cost of the electric latch actuator in the existing technology.

[0005] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a high transmission efficiency electric latch actuator, including:

[0007] A base, on which a guide groove is provided;

[0008] A driving mechanism, which includes an electric motor, a lead screw and a nut. The housing of the electric motor is fixed to the base, the lead screw is coaxially fixed to the output shaft of the electric motor, and the nut is threadedly sleeved on the lead screw; and,

[0009] An actuating mechanism, which includes a slider and a lock rod. The slider is slidably arranged in the guide groove, one end of the slider is fixed to the nut, and the other end of the slider is fixedly connected to one end of the lock rod.

[0010] In some embodiments, two fixing parts are fixed on the base, and the high transmission efficiency electric latch actuator further includes a buffer pad, the buffer pad forms two slots, and the two fixing parts are respectively inserted into the two slots;

[0011] The slider is provided with a first positioning groove, and the buffer pad is slidably arranged in the first positioning groove. When the slider is in the first position, the buffer pad abuts against one end of the first positioning groove. When the slider is in the second position, the buffer pad abuts against the other end of the first positioning groove.

[0012] In some embodiments, a limiting block is further fixed on the base. The slider is provided with a second positioning groove, and the limiting block is slidably arranged in the second positioning groove.

[0013] In some embodiments, one end of the slider is fixedly connected to the nut via a connecting block.

[0014] In some embodiments, the driving mechanism further includes a return spring. The return spring is sleeved on the lead screw. One end of the return spring abuts against the nut, and the other end of the return spring abuts against the housing of the motor.

[0015] In some embodiments, a collar is formed at one end of the nut, and one end of the return spring is sleeved on the collar.

[0016] In some embodiments, a clamping plate is fixed on the base, and a clamping groove for the motor to be clamped into is formed on the clamping plate.

[0017] In some embodiments, two baffle plates are fixed on the base, and the housing of the motor is clamped between the two baffle plates.

[0018] In some embodiments, the actuating mechanism further includes a sleeve. The sleeve is fixed on the base, and the sleeve is slidably sleeved on the locking rod.

[0019] In some embodiments, the high transmission efficiency electric latch actuator further includes a cover plate, and the cover plate is detachably fixed on the base.

[0020] Compared with the prior art, the beneficial effects of the high transmission efficiency electric latch actuator provided by the present utility model are as follows: when in use, when it is necessary to extend the locking rod, the motor drives the lead screw to rotate. The lead screw acts on the nut. Since the nut is limited by the slider and cannot rotate, the rotation of the lead screw is converted into the translation of the nut. The nut drives the slider to move, and the slider drives the locking rod to move, so as to extend the locking rod, thereby realizing the function of the high transmission efficiency electric latch actuator. The present utility model realizes the conversion of the rotation of the motor into the movement of the locking rod through the cooperation of the lead screw and the nut. Compared with the existing transmission scheme using a worm and worm gear combined with a gear and a rack, the transmission efficiency is greatly increased, and at the same time, the structure is simpler and the manufacturing cost is lower. Description of the Drawings

[0021] Figure 1Schematic perspective view of a high transmission efficiency electric latch actuator provided by an embodiment of the present utility model;

[0022] Figure 2 is Figure 1 Schematic perspective view of the high transmission efficiency electric latch actuator in after omitting the cover plate;

[0023] Figure 3 is Figure 2 Schematic perspective view of the high transmission efficiency electric latch actuator in after the lock rod is retracted;

[0024] Figure 4 is Figure 2 Exploded view of the base and the slider in ;

[0025] Explanation of reference numerals: 1 - base, 11 - guide groove, 12 - fixing part, 13 - limiting block, 14 - clamping plate, 141 - clamping groove, 15 - baffle, 2 - driving mechanism, 21 - motor, 22 - lead screw, 23 - nut, 231 - collar, 24 - return spring, 3 - actuating mechanism, 31 - slider, 311 - first positioning groove, 312 - second positioning groove, 32 - lock rod, 33 - connecting block, 34 - sleeve, 4 - buffer pad, 5 - cover plate. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] In order to solve the technical problems of relatively low transmission efficiency, complex internal structure and high manufacturing cost of the electric latch actuator, the present utility model provides a high transmission efficiency electric latch actuator, which can improve the transmission efficiency of the electric latch actuator, simplify the internal structure and reduce the manufacturing cost.

[0028] Please refer to Figures 1-4 , Figure 1 which is a schematic structural view of a high transmission efficiency electric latch actuator in an embodiment of the present utility model. The high transmission efficiency electric latch actuator includes a base 1, a driving mechanism 2 and an actuating mechanism 3.

[0029] A guide groove 11 is formed on the base 1.

[0030] The driving mechanism 2 includes a motor 21, a lead screw 22 and a nut 23. The housing of the motor 21 is fixed to the base 1, the lead screw 22 is coaxially fixed to the output shaft of the motor 21, and the nut 23 is threadedly rotatably sleeved on the lead screw 22.

[0031] The actuator 3 includes a slider 31 and a locking rod 32. The slider 31 is slidably disposed in the guide groove 11. One end of the slider 31 is fixed to the nut 23, and the other end of the slider 31 is fixedly connected to one end of the locking rod 32.

[0032] During use, when it is necessary to extend the locking rod 32, the motor 21 drives the lead screw 22 to rotate. The lead screw 22 acts on the nut 23. Since the nut 23 is restricted by the slider 31 and cannot rotate, the rotation of the lead screw 22 is converted into the translation of the nut 23. The nut 23 drives the slider 31 to move, and the slider 31 drives the locking rod 32 to move, so that the locking rod 32 extends (as shown in Figure 1 and Figure 2 ), thereby realizing the function of the high transmission efficiency electric latch actuator. The present utility model realizes the conversion of the rotation of the motor 21 into the movement of the locking rod 32 through the cooperation of the lead screw 22 and the nut 23. Compared with the existing transmission scheme using a worm and worm gear combined with a gear and a rack, the transmission efficiency is greatly increased, and at the same time, the structure is simpler and the manufacturing cost is lower.

[0033] Preferably, the motor is installed at the central position in the Z direction, and the overall structure is symmetric in the Z direction, so the installation compatibility is better.

[0034] In one embodiment, please refer to Figures 2-4 , two fixing parts 12 are fixed on the base 1. The high transmission efficiency electric latch actuator further includes a buffer pad 4. The buffer pad 4 forms two slots, and the two fixing parts 12 are respectively inserted into the two slots; a first positioning groove 311 is formed on the slider 31, and the buffer pad 4 is slidably disposed in the first positioning groove 311. When the slider 31 is in the first position, the buffer pad 4 abuts against one end of the first positioning groove 311, and when the slider 31 is in the second position, the buffer pad 4 abuts against the other end of the first positioning groove 311. By providing the buffer pad 4, the collision impact between the locking rod 32 and the external lock body can be reduced. Therefore, the noise of the electric latch actuator during locking or unlocking can be reduced. In this embodiment, the material of the buffer pad 4 is EPDM (ethylene propylene diene monomer).

[0035] In one embodiment, please refer to Figures 2-4 , a limiting block 13 is further fixed on the base 1. A second positioning groove 312 is formed on the slider 31, and the limiting block 13 is slidably disposed in the second positioning groove 312, so as to guide the movement of the slider 31 and improve the stability of the slider 31 during movement.

[0036] In one embodiment, please refer to Figures 2-4 , one end of the slider 31 is fixedly connected to the nut 23 via a connecting block 33.

[0037] In one embodiment, please refer to Figures 2-4 , the driving mechanism 2 further includes a return spring 24. The return spring 24 is sleeved on the lead screw 22. One end of the return spring 24 abuts against the nut 23, and the other end of the return spring 24 abuts against the housing of the motor 21. In this embodiment, when it is necessary to retract the locking lever 32, the motor 21 is powered off. Under the restoring force of the return spring 24, the nut 23 moves in the reverse direction, thereby driving the slider 31 and the locking lever 32 to move in the reverse direction, so that the locking lever 32 retracts. During this process, the lead screw 22 will rotate in the reverse direction. It should be understood that in order to reduce the resistance between the nut 23 and the lead screw 22 during the process of pushing the nut 23 to move, a large-pitch lead screw should be selected for the lead screw 22. The contact angle between the large-pitch lead screw and the corresponding nut is smaller, which can reduce the frictional resistance between the two, thereby facilitating the reverse movement of the nut 23 by the return spring 24.

[0038] In one embodiment, please refer to Figures 2-4 , a collar 231 is formed at one end of the nut 23. One end of the return spring 24 is sleeved on the collar 231, thereby limiting the return spring 24.

[0039] In one embodiment, please refer to Figures 2-4 , a clamping plate 14 is fixed on the base 1. A clamping groove 141 for the motor 21 to be clamped into is formed on the clamping plate 14. Two baffle plates 15 are fixed on the base 1. The housing of the motor 21 is clamped between the two baffle plates 15.

[0040] In one embodiment, please refer to Figures 2-4 , the actuating mechanism 3 further includes a sleeve 34. The sleeve 34 is fixed to the base 1. The sleeve 34 is slidably sleeved on the locking lever 32. The sleeve 34 is made of a soft material, which can provide the sealing performance of the device.

[0041] In one embodiment, please refer to Figures 2-4 , the high transmission efficiency electric latch actuator further includes a cover plate 5. The cover plate 5 is detachably fixed to the base 1.

[0042] To better understand the present invention, the technical solution of the present invention will be described in detail below in conjunction with Figures 1 to 4 : When in use, when it is necessary to extend the locking lever 32, the motor 21 drives the lead screw 22 to rotate. The lead screw 22 acts on the nut 23. Since the nut 23 is limited by the slider 31 and cannot rotate, therefore, the rotation of the lead screw 22 is converted into the translation of the nut 23. The nut 23 drives the slider 31 to move, and the slider 31 drives the locking lever 32 to move, so that the locking lever 32 extends (as shown in Figure 1 and Figure 2), thereby realizing the function of a high transmission efficiency electric latch actuator. When it is necessary to retract the lock rod 32, the motor 21 is powered off. Under the restoring force of the return spring 24, the nut 23 moves in the reverse direction, thereby driving the slider 31 and the lock rod 32 to move in the reverse direction, so that the lock rod 32 retracts (as Figure 3 ), during this process, the lead screw 22 will rotate in the reverse direction. The present invention realizes the conversion of the rotation of the motor 21 into the movement of the lock rod 32 through the cooperation of the lead screw 22 and the nut 23. Compared with the existing transmission scheme using worm gears combined with gears and racks, the transmission efficiency is greatly increased, and at the same time, the structure is simpler and the manufacturing cost is lower.

[0043] The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A high transmission efficiency electric latch actuator, characterized in that: include: A base, wherein a guide groove is formed on the base; A driving mechanism, the driving mechanism comprising a motor, a screw and a nut, the housing of the motor being fixed to the base, the screw being coaxially fixed to the output shaft of the motor, and the nut being threadably sleeved on the screw; and, The actuator comprises a slider and a locking rod, wherein the slider is slidably arranged in the guide groove, one end of the slider is fixed to the nut, and the other end of the slider is fixedly connected to one end of the locking rod.

2. The high transmission efficiency electric latch actuator according to claim 1, characterized in that: Two fixing parts are fixed on the base, and the high transmission efficiency electric latch actuator also includes a buffer pad, the buffer pad forms two slots, and the two fixing parts are respectively inserted into the two slots; The slider is provided with a first positioning groove, and the buffer pad is slidably disposed in the first positioning groove. When the slider is located at the first position, the buffer pad abuts against one end of the first positioning groove. When the slider is located at the second position, the buffer pad abuts against the other end of the first positioning groove.

3. The high transmission efficiency electric latch actuator according to claim 1, characterized in that: A limiting block is also fixed on the base, a second positioning groove is provided on the sliding block, and the limiting block is slidably arranged in the second positioning groove.

4. The high transmission efficiency electric latch actuator according to claim 1, characterized in that: One end of the sliding block is fixedly connected to the nut via a connecting block.

5. The high transmission efficiency electric latch actuator according to claim 1, characterized in that: The driving mechanism further comprises a return spring, which is sleeved on the lead screw, one end of which abuts against the nut, and the other end of which abuts against the housing of the motor.

6. The high transmission efficiency electric latch actuator according to claim 5, characterized in that: A collar is formed at one end of the nut, and one end of the return spring is sleeved on the collar.

7. The high transmission efficiency electric latch actuator according to claim 1, characterized in that: A clamping plate is fixed on the base, and a clamping slot for the motor to be clamped is provided on the clamping plate.

8. The high transmission efficiency electric latch actuator according to claim 1, characterized in that: Two baffles are fixed on the base, and the housing of the motor is stuck between the two baffles.

9. The high transmission efficiency electric latch actuator according to claim 1, characterized in that: The actuator also includes a sleeve, which is fixed to the base and slidably sleeved on the locking rod.

10. The high transmission efficiency electric latch actuator according to claim 1, characterized in that: It also includes a cover plate, which is detachably fixed to the base.

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