An actuator

Abstract

The utility model relates to an executor, including primary worm bevel gear drive mechanism and secondary planetary gear drive mechanism, wherein, secondary planetary gear drive mechanism adopts NW planetary gear train and includes sun gear, double planetary gear, internal toothed ring and planet carrier, wherein, double planetary gear includes integrally formed first planetary gear and second planetary gear in different levels, first planetary gear is engaged with sun gear, second planetary gear is engaged with fixed internal toothed ring, is connected with planet carrier to export power through planet carrier simultaneously. According to the executor of the utility model, adopts worm bevel gear drive to realize first stage reduction, then through NW planetary gear train transmission realizes second stage reduction, and optimization transmission number of stages, and the number of parts is few, and the structure is compact, and the output torque is big, realizes low cost, light weight and high efficiency.

Description

Technical Field

[0001] This utility model relates to an automobile seat, and more specifically to an actuator. Background Technology

[0002] The rear seat quick-folding actuator is a crucial component in automotive seat design, allowing the seat to fold forward quickly to increase luggage compartment volume or facilitate passenger access when needed. Dual-actuator configurations, using two actuators to provide greater force, or actuator-plus-torsion-spring configurations, which provide additional force to aid seat folding, are used to ensure the seat folds down quickly and stably. These actuators primarily employ planetary gear transmissions to deliver high torque within a limited space. Transmission is typically achieved through a dual NGW planetary gear train. However, this planetary transmission structure requires significant space, hindering the lightweight design requirements of automotive seats, and also results in high cost and substantial efficiency losses. Utility Model Content

[0003] To address the high cost and other issues in the existing technology, this invention provides an actuator.

[0004] According to the present invention, the actuator includes a primary worm gear transmission mechanism and a secondary planetary gear transmission mechanism. The secondary planetary gear transmission mechanism adopts an NW planetary gear system and includes a sun gear, a double planetary gear, an internal gear ring, and a planet carrier. The double planetary gear includes an integrally formed first planetary gear and a second planetary gear located at different levels. The first planetary gear meshes with the sun gear, and the second planetary gear meshes with a fixed internal gear ring and is connected to the planet carrier to output power through the planet carrier.

[0005] In a preferred embodiment, the actuator further includes a spindle, through which the sun gear and planet carrier are rotatably mounted. The main purpose of the spindle is to prevent gear misalignment during operation and ensure smooth transmission.

[0006] In a preferred embodiment, the actuator further includes an adapted housing and a connecting plate, with the primary worm gear transmission mechanism and the secondary planetary gear transmission mechanism respectively mounted and supported on the housing and the connecting plate.

[0007] In a preferred embodiment, the sun gear is mounted on the spindle and rotates freely. One end of the spindle is received in a bearing hole in the housing, and the other end of the spindle is received in a bearing hole at one end of the planet carrier. The other end of the planet carrier is received in a bearing hole in the connecting plate.

[0008] In a preferred embodiment, the primary worm gear helical gear transmission mechanism includes a worm and a helical gear, wherein the worm and the helical gear are arranged along intersecting axes and mesh with each other to form an intersecting axis transmission mechanism.

[0009] In a preferred embodiment, the helical gear is sleeved on the sun gear and connected to the sun gear in a non-rotatable manner.

[0010] In a preferred embodiment, the actuator further includes a motor fixedly mounted on the outside of the housing, the power output shaft of which extends from the outside into the housing to drive a worm gear inside the housing.

[0011] In a preferred embodiment, the internal gear ring is fixedly installed inside the housing.

[0012] In a preferred embodiment, three double planetary gears mesh around the sun gear within the internal gear ring.

[0013] In a preferred embodiment, the actuator further includes a planetary shaft, with the double planetary gears rotatably mounted on a planet carrier via the planetary shaft.

[0014] According to the actuator of this utility model, the first stage of reduction is achieved by worm gear helical gear transmission, and the second stage of reduction is achieved by NW planetary gear transmission. The number of transmission stages is optimized, the number of parts is reduced, the structure is compact, the output torque is large, and low cost, lightweight and high efficiency are achieved. Attached Figure Description

[0015] Figure 1 This is an exploded view of an actuator according to a preferred embodiment of the present invention.

[0016] Figure 2 yes Figure 1 A cross-sectional view of the actuator.

[0017] Figure 3 yes Figure 1 A schematic diagram of the transmission relationship of the planetary gear transmission system of the actuator.

[0018] Figure 4a yes Figure 1 A schematic diagram of the meshing point of the first planetary gear in the planetary gear transmission system of the actuator.

[0019] Figure 4b yes Figure 1 A schematic diagram of the meshing point of the second planetary gear in the planetary gear transmission system of the actuator.

[0020] Figure 5 This is a schematic diagram of the transmission relationship of a planetary gear transmission system in an actuator of the prior art.

[0021] Figure 6 This is a schematic diagram of the meshing point of a planetary gear transmission system in an actuator of the prior art. Detailed Implementation

[0022] The preferred embodiments of this utility model are given below with reference to the accompanying drawings and described in detail.

[0023] like Figures 1-2 As shown, the actuator according to a preferred embodiment of the present invention includes a housing 1, a connecting plate 10, and a transmission mechanism, wherein the connecting plate 10 is adapted to the housing 1 (for example, the connecting plate 10 is fixed to the housing 1 by a fastening device), and the transmission mechanism is mounted and supported on the housing 1 and the connecting plate 10 and includes a first-stage worm gear transmission mechanism and a second-stage planetary gear transmission mechanism, wherein the second-stage planetary gear transmission mechanism adopts an NW planetary gear train.

[0024] The first-stage worm gear helical gear transmission mechanism includes a worm 2 and a helical gear 4, wherein the worm 2 and the helical gear 4 are arranged along intersecting axes and mesh with each other to form an intersecting axis transmission mechanism.

[0025] like Figures 1-2 As shown, the actuator transmission mechanism according to this embodiment also includes a motor 20, which serves as a power source connected to the worm gear 2 to drive the worm gear 2. In this embodiment, the motor 20 is mounted and fixed on the outside of the housing 1, and the power output shaft of the motor 20 extends from the outside into the housing 1 to drive the worm gear 2 inside the housing 1.

[0026] The two-stage planetary gear transmission mechanism includes a sun gear 5, a double planetary gear 6, an internal gear ring 7, and a planet carrier 9. The internal gear ring 7 is fixedly installed inside the housing 1. The three double planetary gears 6 mesh around the sun gear 5 inside the internal gear ring 7. Each double planetary gear 6 includes an integrally formed first planetary gear 6a and a second planetary gear 6b ​​located at different levels. The first planetary gear 6a meshes with the sun gear 5, and the second planetary gear 6b ​​meshes with the internal gear ring 7 and is connected to the planet carrier 9 to output power through the planet carrier.

[0027] like Figures 1-2 As shown, the transmission mechanism of the actuator according to this embodiment also includes a planetary shaft 8, and the double planetary gear 6 is rotatably mounted on the planet carrier 9 via the planetary shaft 8.

[0028] like Figures 1-2 As shown, the actuator transmission mechanism according to this embodiment further includes a spindle 3, and the sun gear 5 and planetary carrier 9 are rotatably mounted between the housing 1 and the connecting plate 10 via the spindle 3. Specifically, one end of the spindle 3 is received in a bearing hole in the housing 1, and the other end of the spindle 3 is received in a bearing hole at one end of the planetary carrier 9. The other end of the planetary carrier 9 is received in a bearing hole in the connecting plate 10. The sun gear 5 is mounted on the spindle 3 and rotates freely. The helical gear 4 is mounted on the sun gear 5 and is connected to the sun gear 5 in a non-rotatable manner. In this embodiment, the helical gear 4 and the sun gear 5, which is coated with plastic on the helical gear 4, rotate together.

[0029] like Figure 2 and Figure 3As shown, the power transmission route of the actuator according to this embodiment includes: power is first transmitted from the motor 20 to the worm gear 2 via the power output shaft. The worm gear 2 meshes with the helical gear 4 to achieve the functions of speed reduction, torque increase, and change of transmission direction. The helical gear 4 and the sun gear 5 rotate synchronously around the spindle 3. The sun gear 5 also meshes with the first planet gear 6a of the double planetary gear 6, causing the double planetary gear 6 to rotate around their respective planetary shafts 8, thus ensuring smooth power transmission. At the same time, the double planetary gear 6 is connected to the planet carrier 9 through the planetary shafts 8, and finally, the power is output from the spline structure 9.1 on the planet carrier 9.

[0030] like Figure 3 As shown, the actuator according to this utility model is a two-stage transmission mechanism consisting of a worm gear helical gear and an NW planetary gear. Thus, the actuator according to this utility model can save at least four parts, reducing the total weight by approximately 14%, achieving lightweight design.

[0031] like Figure 3 and Figures 4a-4b As shown, the actuator according to this utility model has two-stage reduction, and the planetary gears 6a and 6b each have three meshing tooth surfaces. Figure 5 and Figure 6 As shown, existing actuators have three-stage reduction, with each stage of the planetary gear transmission involving six tooth meshes. Thus, the actuator according to the present invention can reduce the number of tooth meshes, reduce gear meshing losses, and improve transmission efficiency. In a preferred embodiment, efficiency is improved by 4%.

[0032] Under the condition that the component structure meets the strength requirements and the output performance reaches 150Nm, the dimensions of the existing actuator are 147.1mm*101.2mm*46.3mm, while the dimensions of the actuator according to a preferred embodiment of the utility model are 145.2mm*83.3mm*44.1mm, with reductions in all three dimensions, especially in the width direction which is reduced by about 18mm. This results in a compact structure, facilitating installation and improving product adaptability. Furthermore, the actuator according to the preferred embodiment of the utility model saves on components; the thickness of the internal gear ring can be reduced by half, correspondingly saving on the development costs of component molds and reducing the unit cost of components by about 8%, thus exhibiting the characteristics of low cost and high efficiency. In particular, the actuator of this utility model prevents the NW planetary gear from being overloaded by the spindle 3, ensuring the stability of the meshing of each gear stage, reducing frictional losses between components, and greatly improving the overall output efficiency, resulting in an overall improvement in product performance.

[0033] In summary, the actuator of this invention employs a two-stage transmission mode of worm gear helical gear + NW planetary gear. The NW planetary gear consists of a sun gear 5, three double-linked planetary gears 6, and an internal gear ring 7. Compared to double NW, it reduces the thickness of one planetary carrier and eliminates one transmission stage. This not only reduces the structural space required for the transmission mechanism and makes the structure more compact, but also achieves a large transmission ratio, thereby reducing the torque requirement of the motor and thus decreasing its size and weight. Furthermore, the self-locking property of the staggered-axis worm gear helical gear transmission structure ensures that the adjusted seat position can be stably maintained.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various variations can be made to the above embodiments of this utility model. That is, all simple and equivalent changes and modifications made based on the claims and description of this utility model application fall within the protection scope of the claims of this utility model patent. Any aspects of this utility model not described in detail are conventional technical content.

Claims

1. An actuator, characterized in that, The actuator includes a primary worm gear transmission mechanism and a secondary planetary gear transmission mechanism. The secondary planetary gear transmission mechanism adopts an NW planetary gear system and includes a sun gear, a double planetary gear, an internal gear ring, and a planet carrier. The double planetary gear includes an integrally formed first planetary gear and a second planetary gear located at different levels. The first planetary gear meshes with the sun gear, and the second planetary gear meshes with a fixed internal gear ring and is connected to the planet carrier to output power through the planet carrier.

2. The actuator of claim 1, wherein, The actuator also includes a spindle, and the sun gear and planet carrier are rotatably mounted via the spindle.

3. The actuator of claim 2, wherein, The actuator also includes an adaptable housing and a connecting plate, with the first-stage worm gear transmission mechanism and the second-stage planetary gear transmission mechanism respectively mounted and supported on the housing and the connecting plate.

4. The actuator of claim 3, wherein, The sun gear is mounted on the spindle and rotates freely. One end of the spindle is received in the bearing hole in the housing, and the other end of the spindle is received in the bearing hole at one end of the planet carrier. The other end of the planet carrier is received in the bearing hole of the connecting plate.

5. The actuator of claim 3, wherein, A single-stage worm gear helical gear transmission mechanism includes a worm and a helical gear, wherein the worm and the helical gear are arranged along intersecting axes and mesh with each other to form an intersecting axis transmission mechanism.

6. The actuator of claim 5, wherein, The helical gear is mounted on the sun gear and connected to the sun gear in a non-rotatable manner.

7. The actuator of claim 5, wherein, The actuator also includes a motor fixedly mounted on the outside of the housing, whose power output shaft extends from the outside into the housing to drive the worm gear inside the housing.

8. The actuator of claim 3, wherein, The internal gear ring is fixedly installed inside the housing.

9. The actuator of claim 8, wherein, Three double planetary gears mesh around the sun gear within the internal gear ring.

10. The actuator of claim 1, wherein, The actuator also includes a planetary shaft, with a double planetary gear mounted rotatably on a planet carrier via the planetary shaft.

Images