Electric actuator and electric supporting rod comprising same

Abstract

The utility model relates to the technical field of automobile parts, in particular to an electric actuator and an electric supporting rod comprising the same. The electric actuator comprises a motor assembly; a decelerator; the damper is arranged between the motor assembly and the speed reducer assembly and used for reducing the rotating speed of an output shaft of the motor assembly, and the speed reduction amount is increased through a speed reducer; wherein the speed reducer is a worm gear speed reducer. The transmission mechanism has the characteristics of compact structure, large transmission ratio, stable transmission, low noise, self-locking and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive parts, and more specifically, to an electric actuator and an electric strut including the same. Background Art

[0002] An electric strut for a vehicle tailgate is a device installed on the vehicle tailgate, mainly used to support and control the opening and closing of the tailgate. It mainly consists of a strut, a hydraulic cylinder (or pneumatic cylinder), a motor, a controller, etc. The working principle of the electric strut is mainly based on a hydraulic system or a pneumatic system driven by a motor. When the vehicle owner presses the switch, the motor drives the hydraulic cylinder or pneumatic cylinder to work through the signal of the controller. The hydraulic cylinder or pneumatic cylinder transmits the liquid or gas into the strut, causing it to extend or contract. The strut then supports or controls the movement of the tailgate through the transmission of force, thereby realizing the function of opening or closing.

[0003] To improve the stability of the drive system of the electric strut for a vehicle tailgate, a damper needs to be added. Currently, the dampers used to provide damping on the market are generally arranged behind the reduction device, that is, the motor is connected to the reducer, the reducer is connected to the damper, and the damper is then connected to the strut. This results in a relatively large volume of the entire drive assembly, which is not conducive to product design and layout. In addition, the damping torque that the damper needs to provide is relatively large, requiring higher material selection requirements for the internal parts of the damper, and thus the cost is high.

[0004] The applicant applied for an electric actuator for improving torque and an automotive electric tailgate strut system with the publication number CN219960304U, including: a motor device for providing power for the movement of the automotive electric tailgate strut; a reduction gearbox driven by the motor output shaft of the motor device; a damping device for adding a load to the motor output shaft of the motor device and reducing the rotational speed of the motor output shaft. The damping device is arranged inside the motor device, or the damping device is arranged inside the reduction gearbox, or the damping device is arranged at the connection between the motor device and the reduction gearbox. By adding a damping device at the end of the motor output shaft to increase the motor load and then amplifying the torque through the reduction gearbox, the purpose of reducing the fixed end of the strut assembly, optimizing the structure, and optimizing the cost is achieved. However, the reduction gearbox used is a planetary reduction gearbox, which cannot achieve a large reduction ratio and a self-locking function. Summary of the Utility Model

[0005] The main purpose of the present utility model is to propose an electric actuator and an electric strut for an automotive electric tailgate strut to solve the technical problems mentioned in the background art.

[0006] To solve the above technical problems, on the one hand, the present utility model proposes an electric actuator, including:

[0007] Motor assembly;

[0008] Reducer;

[0009] And a damper, which is arranged between the motor assembly and the reducer assembly, is used to reduce the rotational speed of the output shaft of the motor assembly, and the reducer increases the amount of speed reduction;

[0010] Wherein, the reducer is a worm and worm gear reducer.

[0011] In the above technical solution, further, the worm and worm gear reducer includes:

[0012] A worm, the end of which is connected to the output end of the damper;

[0013] And a worm gear, which meshes with the worm.

[0014] In any of the above technical solutions, further, the damper includes:

[0015] A mounting seat, which is provided with a mounting chamber at one end close to the motor assembly and a through hole communicating with the mounting chamber at the other end;

[0016] A transmission external gear, which is arranged in the mounting chamber;

[0017] A transmission internal gear ring, which is sleeved on the transmission external gear and meshes with the transmission external gear;

[0018] Two pressing plates, which are respectively arranged on both sides of the transmission internal gear ring;

[0019] An end cover, which is of a hollow structure and is arranged at the port of the mounting chamber;

[0020] And a wave spring, one end of which abuts against the inner end face of the end cover and the other end abuts against one of the pressing plates, so that the two pressing plates jointly apply a squeezing force to both sides of the transmission internal gear ring;

[0021] Wherein, the output shaft of the motor assembly passes through the end cover and is connected to the transmission external gear, and the output shaft of the motor assembly is also connected to the worm after passing through the through hole.

[0022] In any of the above technical solutions, further, a gear is fixedly arranged at the end of the worm; the damper further includes:

[0023] A connecting sleeve, which is of a hollow structure, one end of which passes through the through hole on the mounting seat and abuts against the end face of one of the transmission external gears, and the other end is provided with a first limiting block meshing with the teeth on the gear;

[0024] Wherein, the output shaft of the motor assembly is in interference fit with the connecting sleeve after passing through the through hole; when the motor assembly drives the connecting sleeve to rotate, the first limiting block on the connecting sleeve pushes the gear to rotate synchronously and drives the worm to rotate.

[0025] In any of the above technical solutions, further, there are several first limiting blocks, which are distributed on the end of the connecting sleeve along the circumferential direction;

[0026] Among them, each first limiting block meshes with the teeth on the gear.

[0027] In any of the above technical solutions, further, a second limiting block is further provided at the end of the worm, and there are several second limiting blocks and they are distributed along the circumferential direction;

[0028] Among them, the tooth grooves on both sides of each tooth on the gear mesh with the first limiting block and the second limiting block respectively.

[0029] In any of the above technical solutions, further, the mounting seat and the end cover are arranged on the motor assembly by screws.

[0030] In any of the above technical solutions, further, the damper further includes:

[0031] A sheath, which is sleeved on the mounting seat.

[0032] In any of the above technical solutions, further, it further includes:

[0033] A housing;

[0034] Among them, the motor assembly, the reducer and the damper are all arranged in the housing.

[0035] On the other hand, an electric strut is further proposed, which includes a strut assembly, and among them, it further includes the electric actuator in any of the above technical solutions;

[0036] Among them, the worm gear is connected to the input end of the strut assembly.

[0037] Beneficial effects: Compared with the prior art, the damper is installed between the motor assembly and the reducer. Thus, by using the principle of the reducer to increase torque and amplify the damping force of the damper, the damping value of the damper can be designed to be smaller. Therefore, materials that can meet the requirements of small damping can be selected, which saves costs, and the volume of the damper is also relatively designed to be smaller, which is beneficial to the product design and layout. The worm gear reducer has the characteristics of compact structure, large transmission ratio, smooth transmission, low noise and self-locking. Therefore, the worm gear reducer is used to replace the planetary reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 It is a partial structural schematic diagram of the electric strut of the present utility model;

[0040] Figure 2 It is a partial structural schematic diagram of the electric strut of the present utility model;

[0041] Figure 3 It is a schematic diagram of the connection structure between the damper and the worm of the present utility model;

[0042] Figure 4 It is an exploded structural schematic diagram of the damper of the present utility model.

[0043] The description of the reference numerals is as follows:

[0044] 1. Motor assembly; 2. Reducer; 21. Worm; 211. Gear; 212. Second limit block; 22. Worm gear; 3. Damper; 31. Mounting seat; 32. Driving external teeth; 33. Driving internal gear ring; 34. Pressing piece; 35. End cover; 36. Wave spring; 37. Connecting sleeve; 371. First limit block; 38. Screw; 39. Sheath; 4. Outer shell; 10. Strut assembly. Detailed implementation manners

[0045] Next, exemplary embodiments according to the present application will be described in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0046] It should be noted that, as shown in the present application and the claims, unless the context clearly indicates an exception, words such as "a", "an", "one" and / or "the" are not specifically singular, but may also include plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0047] If there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0048] In the present utility model, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0050] The following will elaborate on an electric actuator and an electric strut including the same according to the present application through the following embodiments.

[0051] Embodiment 1:

[0052] As Figures 1 - 4 shown, in this embodiment, an electric actuator is proposed, including: a motor assembly 1; a speed reducer 2; and a damper 3, which is arranged between the motor assembly 1 and the speed reducer 2 assembly and is used to reduce the rotational speed of the output shaft of the motor assembly 1, and the speed reducer 2 increases the amount of speed reduction.

[0053] Among them, the speed reducer 2 is a worm and worm gear speed reducer 22-21.

[0054] For the traditional actuator structure, when the damper 3 is arranged at the output end of the reducer 2, there are problems such as being disadvantageous to the product design layout, relatively large damping torque required for the damper 3, high requirements for the material selection of the internal parts of the damper 3, and high costs. Therefore, the damper 3 is installed between the motor assembly 1 and the reducer 2. Thus, by using the principle of the reducer 2 to increase torque and amplify the damping force of the damper 3, the damping value of the damper 3 can be designed to be smaller. Therefore, materials that can meet the requirements of small damping can be selected, which saves costs, and the volume of the damper 3 is also designed to be relatively smaller, which is beneficial to the product design layout. The worm and worm gear reducer 2 has the characteristics of a compact structure, a large transmission ratio, smooth transmission, low noise, and self-locking. Therefore, the worm and worm gear reducer 2 is used to replace the planetary reducer 2.

[0055] Specifically, the worm and worm gear reducer 2 includes: a worm 21, whose end is connected to the output end of the damper 3; and a worm gear 22, which meshes with the worm 21.

[0056] In this embodiment, the mounting seat 31 and the end cover 35 are arranged on the motor assembly 1 through screws 38. To facilitate the installation of the entire damper 3, so that it can be stably installed on the output end of the motor assembly 1.

[0057] In this embodiment, the damper 3 further includes: a sheath 39, which is sleeved on the mounting seat 31. The sheath 39 is made of rubber material, and the sheath 39 is provided to protect the internal structure of the damper 3.

[0058] In this embodiment, it further includes: a housing 4; wherein, the motor assembly 1, the reducer 2, and the damper 3 are all arranged in the housing 4.

[0059] Embodiment Two:

[0060] This embodiment is a further improvement based on Embodiment One.

[0061] As Figure 3 and Figure 4 shown, in this embodiment, the damper 3 includes: a mounting seat 31, which has a mounting chamber at one end close to the motor assembly 1 and a through hole at the other end communicating with the mounting chamber; a transmission external gear 32, which is arranged in the mounting chamber; a transmission internal gear ring 33, which is sleeved on the transmission external gear 32 and meshes with the transmission external gear 32; a pressing plate 34, which has two pieces and is respectively arranged on both sides of the transmission internal gear ring 33; an end cover 35, which has a hollow structure and is arranged at the port of the mounting chamber; and a corrugated spring 36, one end of which abuts against the inner end face of the end cover 35 and the other end abuts against one of the pressing plates 34, so that the two pressing plates 34 jointly apply a squeezing force to both sides of the transmission internal gear ring 33;

[0062] Among them, the output shaft of the motor assembly 1 passes through the end cover 35 and is connected to the transmission external gear 32, and the output shaft of the motor assembly 1 is also connected to the worm 21 after passing through the through hole.

[0063] Under normal conditions, after the compression elastic force of the wave spring 36 acts on one pressing piece 34 in contact with it, it will push the pressing piece 34 to move, and then squeeze the transmission internal gear ring 33 and the other pressing piece 34, so that both sides of the transmission internal gear ring 33 are squeezed by the two pressing pieces 34, so that the transmission internal gear ring 33 has to overcome the damping brought by the two pressing pieces 34 when rotating.

[0064] When the motor assembly 1 operates , its output shaft drives the transmission external gear 32 to rotate. Since the transmission external gear 32 meshes with the transmission internal gear ring 33, the transmission external gear 32 also rotates synchronously. In this process, the motor assembly 1 needs to overcome the damping of the damper 3 and then drive the worm 21 to rotate. After the worm 21 rotates, it will drive the worm gear 22 meshing with it to rotate, and the output end of the worm gear 22 drives the object connected to it to rotate.

[0065] It should be noted that for the convenience of installation and to accurately connect the output end of the motor assembly 1 with the worm 21, a gear 211 and a connecting sleeve 37 are provided to achieve the purpose of coupling.

[0066] Specifically, a gear 211 is fixedly arranged at the end of the worm 21; the damper 3 further includes: a connecting sleeve 37, which is of a hollow structure. One end of it passes through the through hole on the mounting seat 31 and abuts against the end face of one of the transmission external gears 32, and the other end is provided with a first limiting block 371 meshing with the teeth on the gear 211;

[0067] Among them, the output shaft of the motor assembly 1 is in interference fit with the connecting sleeve 37 after passing through the through hole; when the motor assembly 1 drives the connecting sleeve 37 to rotate, the first limiting block 371 on the connecting sleeve 37 pushes the gear 211 to rotate synchronously and drives the worm 21 to rotate.

[0068] The gear 211 is installed at the end of the worm 21 through a pin. When the output end of the motor assembly 1 drives the connecting sleeve 37 to rotate, in order to make the connecting sleeve 37 also drive the gear 211 to rotate and then drive the worm 21 to rotate, a first limiting block 371 is provided at the end of the connecting sleeve 37. The first limiting block 371 meshes with the gear 211. Then when the connecting sleeve 37 rotates, the first limiting block 371 on it will push the gear 211 to rotate at the same time. In order to improve the stability between the connecting sleeve 37 and the gear 211, the first limiting block 371 is set to be several and distributed circumferentially on the end of the connecting sleeve 37; among them, each first limiting block 371 meshes with the teeth on the gear 211.

[0069] Since the connecting sleeve 37 applies a radial force to the gear 211 when driving the gear 211 to rotate, after a long time, this radial force will cause the connection between the gear 211 and the worm 21 to become loose. Based on this, a second limiting block 212 is provided at the end of the worm 21. There are several second limiting blocks 212 and they are distributed along the circumferential direction. Among them, the tooth grooves on both sides of each tooth of the gear 211 are respectively engaged with the first limiting block 371 and the second limiting block 212.

[0070] When the motor assembly 1 drives the connecting sleeve 37 to rotate, the first limiting block 371 on it applies a rotational thrust to the gear 211, and then the gear 211 acts this thrust on the second limiting block 212 on the worm 21. That is to say, the gear 211 is only used as a connecting part installed at the end of the worm 21. After this setting, the connection stability between the worm 21 and the connecting sleeve 37 can be effectively improved.

[0071] Embodiment Three:

[0072] As Figure 1 and Figure 2 shown, this embodiment proposes an electric strut, including a strut assembly 10. Among them, it further includes the electric actuator in any of the above embodiments. Among them, the worm gear 22 is connected to the input end of the strut assembly 10.

[0073] By using the electric strut with this electric actuator, the volume of the whole electric strut can be effectively reduced, and the cost can be further reduced.

[0074] The above has described the embodiments of the present disclosure. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technologies in the market, or to enable other ordinary skilled persons in the technical field to understand the embodiments disclosed herein.

Claims

1. An electric actuator, characterized in that, Comprising: A motor assembly (1); A speed reducer (2); And a damper (3), disposed between the motor assembly (1) and the speed reducer (2) assembly, for reducing the rotational speed of the output shaft of the motor assembly (1), and increasing the speed reduction amount by the speed reducer (2); Wherein, the speed reducer (2) is a worm (21) and worm wheel (22) speed reducer (2).

2. The electric actuator according to claim 1, characterized in that, The worm (21) and worm wheel (22) speed reducer (2) includes: A worm (21), whose end is connected to the output end of the damper (3); And a worm wheel (22), meshing with the worm (21).

3. The electric actuator according to claim 2, wherein The damper (3) includes: A mounting seat (31), which has a mounting chamber at one end close to the motor assembly (1), and a through hole communicating with the mounting chamber at the other end; A transmission external gear (32), disposed in the mounting chamber; A transmission internal gear ring (33), sleeved on the transmission external gear (32), and meshing with the transmission external gear (32); Pressing plates (34), having two pieces, and respectively disposed on both sides of the transmission internal gear ring (33); An end cover (35), which is a hollow structure, disposed at the port of the mounting chamber; And a corrugated spring (36), one end abuts against the inner end face of the end cover (35), and the other end abuts against one of the pressing plates (34), so that the two pressing plates (34) jointly apply an extrusion force to both sides of the transmission internal gear ring (33); Wherein, the output shaft of the motor assembly (1) passes through the end cover (35) and is connected to the transmission external gear (32), and the output shaft of the motor assembly (1) is also connected to the worm (21) after passing through the through hole.

4. The electric actuator according to claim 3, characterized in that, A gear (211) is fixedly provided at the end of the worm (21); the damper (3) further includes: A connecting sleeve (37), which is a hollow structure, one end passes through the through hole on the mounting seat (31) and abuts against the end face of one of the transmission external gears (32), and the other end is provided with a first limiting block (371) meshing with the teeth on the gear (211); Wherein, the output shaft of the motor assembly (1) is in interference fit with the connecting sleeve (37) after passing through the through hole; when the motor assembly (1) drives the connecting sleeve (37) to rotate, the first limiting block (371) on the connecting sleeve (37) pushes the gear (211) to rotate synchronously, and drives the worm (21) to rotate.

5. The electric actuator according to claim 4, characterized in that, There are several first limiting blocks (371), and they are distributed along the circumferential direction at the end of the connecting sleeve (37); Wherein, each of the first limiting blocks (371) meshes with the teeth on the gear (211).

6. The electric actuator according to claim 5, wherein, A second limiting block (212) is further provided at the end of the worm (21), and there are several second limiting blocks (212) and they are distributed along the circumferential direction; Wherein, the tooth grooves on both sides of each tooth on the gear (211) respectively mesh with the first limiting block (371) and the second limiting block (212).

7. The electric actuator according to claim 3, wherein, The mounting seat (31) and the end cover (35) are disposed on the motor assembly (1) by screws (38).

8. The electric actuator according to claim 3, characterized in that, The damper (3) further includes: a sheath (39) sleeved on the mounting base (31).

9. The electric actuator according to claim 1, characterized in that It further includes: a housing (4); wherein, the motor assembly (1), the speed reducer (2) and the damper (3) are all arranged inside the housing (4).

10. An electric strut, comprising a strut assembly (10), characterized in that, It further includes the electric actuator according to any one of claims 2-8; wherein, the worm gear (22) is connected to the input end of the support rod assembly (10).

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