Gearbox transmission mechanism and vehicle-mounted projection curtain

Abstract

This utility model discloses a gearbox transmission mechanism and a vehicle-mounted projection screen. The rotor of a motor drives a first worm gear to rotate. The first worm gear, in conjunction with a first helical gear, transmits power to a first gear transmission assembly. Under the action of a coupling, the first gear transmission assembly transmits torque to a second gear transmission assembly, and they move together. The first and second gear transmission assemblies are located on the upper and lower sides of the coupling, respectively, changing the overall spatial orientation and reducing the space occupied. At the output end of the second gear transmission assembly, a second worm gear engages with a second helical gear, and power is transmitted to an external device through the second helical gear to drive its movement. The engagement of the first worm gear with the first helical gear and the second worm gear with the second helical gear allows for a large transmission ratio in a compact structure, and its meshing characteristics are smoother, ensuring stable transmission and reducing vibration and noise during operation.

Description

Technical Field

[0001] This utility model relates to the field of gearboxes, specifically to a gearbox transmission mechanism and a vehicle-mounted projection screen. Background Technology

[0002] Currently, most gearboxes on the market are either spur gear transmissions or planetary gear reducers. To achieve low-speed, heavy-load operation, existing spur gear transmissions require a large number of gears to increase the transmission ratio, resulting in a simple gear layout and relatively inflexible structure. Planetary gear reducers, on the other hand, require more layers, leading to a larger footprint. Furthermore, most gearboxes are quite noisy during operation, making them unsuitable for everyday use. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a gearbox transmission mechanism and a vehicle-mounted projection screen, which can solve the problems of large space occupation and high noise during operation of low-speed heavy-duty gearboxes in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: On the one hand, a gearbox transmission mechanism is provided, including a housing, a drive assembly, a first gear transmission assembly, and a second gear transmission assembly. The first gear transmission assembly and the second gear transmission assembly are both rotatably mounted on the housing. The drive assembly includes a motor and a first worm. The stator of the motor is fixedly mounted on the housing, and the rotor of the motor is connected to the first worm. The input end of the first gear transmission assembly is provided with a first helical gear, which meshes with the first worm. The output end of the first gear transmission assembly is connected to the input end of the second gear transmission assembly through a coupling, which is vertically arranged. The output end of the second gear transmission assembly is provided with a second worm and a second helical gear, which meshes with the second helical gear, and the second helical gear is mounted on an external device.

[0005] As a further improvement to the above technical solution, the first gear transmission assembly includes a first gear, a second gear, a third gear, and a fourth gear. The first gear is a double gear and includes a spur gear and a first helical gear. The spur gear, the second gear, the third gear, and the fourth gear mesh in sequence, and the fourth gear is connected to the input end of the coupling.

[0006] As a further improvement to the above technical solution, both the second gear and the third gear are double gears.

[0007] As a further improvement to the above technical solution, the second gear transmission assembly includes a fifth gear, a sixth gear, and a seventh gear. The fifth gear is connected to the output end of the coupling and meshes with the sixth gear. The sixth gear is mounted on the second worm gear, and the seventh gear includes the second helical gear.

[0008] As a further improvement to the above technical solution, there are two fifth gears, and the two fifth gears mesh with each other. One fifth gear is connected to the output end of the coupling, and the other fifth gear meshes with the sixth gear.

[0009] As a further improvement to the above technical solution, the two ends of the second worm are rotatably connected to the housing through a thrust bearing and a first rolling bearing, respectively, and an angular contact bearing is provided on the second worm near its worm teeth.

[0010] As a further improvement to the above technical solution, one end of the coupling is rotatably connected to the housing via a flange bearing.

[0011] As a further improvement to the above technical solution, the second helical gear is rotatably connected to the housing via a second rolling bearing.

[0012] On the other hand, a vehicle-mounted projection screen is provided, including a mounting component and the aforementioned gearbox transmission mechanism, wherein the second helical gear is mounted on the mounting component, and the mounting component is used to mount the screen.

[0013] As a further improvement to the above technical solution, a limiting groove is provided on the housing, and a limiting block is provided below the mounting component. The limiting block is located in the limiting groove, and the limiting block abuts against one inner wall of the limiting groove.

[0014] The beneficial effects of this invention are as follows: The rotor of the motor drives the first worm to rotate, and the first worm, in cooperation with the first helical gear, transmits power to the first gear transmission assembly. Under the action of the coupling, the first gear transmission assembly transmits torque to the second gear transmission assembly and moves together. Furthermore, because the coupling is vertically positioned, the first and second gear transmission assemblies are located on the upper and lower sides of the coupling, respectively, changing the overall spatial orientation and reducing the space occupied, thus meeting transmission requirements with a smaller volume. At the output end of the second gear transmission assembly, the second worm cooperates with the second helical gear, and power is transmitted to an external device through the second helical gear to drive the movement of the external device. The cooperation between the first worm and the first helical gear, and the cooperation between the second worm and the second helical gear, allows for a large transmission ratio with a compact structure, and their meshing characteristics are smoother, ensuring smooth transmission and reducing vibration and noise during operation. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a structural schematic diagram of the gearbox transmission mechanism and mounting components provided in a preferred embodiment of the present invention;

[0017] Figure 2 yes Figure 1 A structural schematic diagram of the gearbox transmission mechanism and mounting components from another angle;

[0018] Figure 3 This is a schematic diagram of the internal gear structure of the gearbox transmission mechanism and mounting component provided in a preferred embodiment of the present invention;

[0019] Figure 4 yes Figure 3 A schematic diagram of the gearbox transmission mechanism and the internal gear structure of the mounting components from another angle.

[0020] Reference numerals: 1. Housing; 2. Drive assembly; 3. First gear transmission assembly; 4. Second gear transmission assembly; 5. Mounting component;

[0021] 11. Limiting groove; 21. Motor; 22. First worm gear; 31. First helical gear; 32. Coupling; 33. First gear; 34. Second gear; 35. Third gear; 36. Fourth gear; 41. Second worm gear; 42. Second helical gear; 43. Fifth gear; 44. Sixth gear; 45. Seventh gear; 51. Limiting block;

[0022] 321. Flange bearing; 331. Spur gear; 332. Bushing; 411. Thrust bearing; 412. First rolling bearing; 413. Angular contact bearing; 421. Second rolling bearing. Detailed Implementation

[0023] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / connections involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. For example, fixed connections / fixed installations can use screw connections, bolt connections, pin connections, key connections, adhesive connections, mortise and tenon connections, welding, riveting, etc., as needed. For detachable connections, screw connections, bolt connections, threaded connections, snap-fit ​​connections, mortise and tenon connections, Velcro connections, etc., can be used as needed. The various technical features in this utility model can be combined interactively without contradicting each other.

[0024] Please see Figure 1 , 3 A preferred embodiment of this utility model provides a gearbox transmission mechanism, including a housing 1, a drive assembly 2, a first gear transmission assembly 3, and a second gear transmission assembly 4. The first gear transmission assembly 3 and the second gear transmission assembly 4 are both rotatably mounted on the housing 1. The drive assembly 2 is used to provide power, the first gear transmission assembly 3 is used to transmit power to the second gear transmission assembly 4, and the second gear transmission assembly 4 is used to transmit power to an external device to drive the external device to move.

[0025] For details, please see Figure 3-4The drive assembly 2 includes a motor 21 and a first worm gear 22. The stator of the motor 21 is fixedly mounted on the housing 1, and the rotor of the motor 21 is connected to the first worm gear 22. The input end of the first gear transmission assembly 3 is provided with a first helical gear 31, which meshes with the first worm gear 22. The output end of the first gear transmission assembly 3 is connected to the input end of the second gear transmission assembly 4 through a coupling 32, which is vertically arranged. The output end of the second gear transmission assembly 4 is provided with a second worm gear 41 and a second helical gear 42, which mesh with the second helical gear 42, and the second helical gear 42 is mounted on an external device. The rotor of motor 21 drives the first worm 22 to rotate. The first worm 22, in conjunction with the first helical gear 31, transmits power to the first gear transmission assembly 3. Under the action of coupling 32, the first gear transmission assembly 3 transmits torque to the second gear transmission assembly 4, and they move together. Because coupling 32 is vertically positioned, the first gear transmission assembly 3 and the second gear transmission assembly 4 are located on the upper and lower sides of coupling 32, respectively, changing the overall spatial orientation and reducing the space occupied, thus meeting transmission requirements with a smaller volume. At the output end of the second gear transmission assembly 4, the second worm 41 engages with the second helical gear 42, and through the second helical gear 42, power is transmitted to an external device to drive its movement. The engagement of the first worm 22 with the first helical gear 31 and the second worm 41 with the second helical gear 42 allows for a large transmission ratio in a compact structure, and its meshing characteristics are smoother, ensuring smooth transmission and reducing vibration and noise during operation.

[0026] Among them, motor 21 is a brushless coreless motor. Its rotor has no iron core, which not only eliminates eddy current and hysteresis losses and improves energy conversion efficiency, but also extends the product's service life. Its compact structure and light weight allow it to output greater torque within the same volume. Furthermore, because the coreless rotor has no iron core, the centrifugal force is uniform during rotor rotation, which reduces vibration and noise, making it suitable for quiet environments.

[0027] In this embodiment, the first gear transmission assembly 3 includes a first gear 33, a second gear 34, a third gear 35, and a fourth gear 36. The first gear 33 is a double gear and includes a spur gear 331 and a first helical gear 31. The spur gear 331, second gear 34, third gear 35, and fourth gear 36 mesh sequentially, and the fourth gear 36 is connected to the input end of the coupling 32. The first helical gear 31 meshes with the first worm gear 22, and the first helical gear 31 drives the spur gear 331 to rotate synchronously. Power is transmitted sequentially from the spur gear 331, second gear 34, third gear 35, and fourth gear 36 to the coupling 32 to achieve a large transmission ratio. Furthermore, a bushing 332 is provided above the first gear 33 to reduce the axial force generated during the transmission of the first helical gear 31, reduce play, reduce cross-linking, and ensure smooth transmission.

[0028] To further improve space utilization, the second gear 34 and the third gear 35 are both double gears, which can provide two different transmission ratios on the same shaft, thereby achieving multi-stage speed change and making the design more compact. In addition, since the double gears are not two independent gears, the assembly process is greatly simplified, saving time and reducing the probability of errors.

[0029] The second gear transmission assembly 4 includes a fifth gear 43, a sixth gear 44, and a seventh gear 45. The fifth gear 43 is connected to the output end of the coupling 32 and meshes with the sixth gear 44. The sixth gear 44 is mounted on the second worm gear 41. The seventh gear 45 includes a second helical gear 42. Power is transmitted from the coupling 32 sequentially to the fifth gear 43 and the sixth gear 44, and the sixth gear 44 drives the second worm gear 41 to rotate. The second worm gear 41 then transmits the power to the second helical gear 42. The transmission ratio is further increased through the meshing of multiple gears.

[0030] In this embodiment, there are two fifth gears 43, and the two fifth gears 43 mesh. One fifth gear 43 is connected to the output end of the coupling 32, and the other fifth gear 43 meshes with the sixth gear 44. The arrangement of the two fifth gears 43 can form an efficient constant speed reverse transmission mechanism to realize the change of rotation direction in a reliable manner.

[0031] The two ends of the second worm 41 are rotatably connected to the housing 1 via a thrust bearing 411 and a first rolling bearing 412, respectively. An angular contact bearing 413 is installed near the worm teeth of the second worm 41. The angular contact bearing 413 can withstand radial forces (such as the weight of mating parts and impact forces) and axial forces (such as the thrust during meshing), effectively limiting axial movement. Furthermore, the rolling elements inside the angular contact bearing 413 have point contact with the raceway, resulting in a low coefficient of friction, which reduces heat generation and energy loss during operation. The thrust bearing 411 can directly withstand axial forces (such as the thrust during meshing), preventing axial movement and ensuring that the second worm 41 operates in its designed position. The combined arrangement of the thrust bearing 411 and the angular contact bearing 413 allows for more reasonable force distribution on the second worm 41, extending its overall service life.

[0032] One end of the coupling 32 is rotatably connected to the housing 1 via a flange bearing 321. The flange edge of the flange bearing 321 can achieve axial positioning of the flange bearing 321, simplifying installation and positioning, and can also provide a certain axial support, so that the flange bearing 321 can withstand a certain degree of axial load and prevent the flange bearing 321 from moving axially.

[0033] The second helical gear 42 is rotatably connected to the housing 1 via the second rolling bearing 421. The second rolling bearing 421 reduces the friction when the second helical gear 42 rotates, improves the transmission efficiency, and provides precise and stable radial and axial support for the second helical gear 42, ensuring the rotational accuracy and positioning accuracy of the second helical gear 42.

[0034] A preferred embodiment of this utility model also provides a vehicle-mounted projection screen, including a mounting member 5 and the gearbox transmission mechanism described in the above embodiment. A second helical gear 42 is mounted on the mounting member 5, which is used to mount the screen. The second helical gear 42 drives the mounting member 5, thereby driving the screen on the mounting member 5 to move. The first gear transmission assembly 3 and the second gear transmission assembly 4 are located on the upper and lower sides of the coupling 32, respectively, changing the overall spatial orientation and reducing the space occupied. This allows for a smaller volume to meet transmission requirements. Furthermore, the engagement of the first worm 22 with the first helical gear 31 and the engagement of the second worm 41 with the second helical gear 42 can achieve a large transmission ratio with a compact structure. Moreover, its meshing characteristics are smoother, ensuring smooth transmission and reducing vibration and noise during operation.

[0035] For more details, please see Figure 2 The housing 1 is provided with a limiting groove 11, and the mounting part 5 is provided with a limiting block 51 below it. The limiting block 51 is located in the limiting groove 11 and abuts against the inner wall of one side of the limiting groove 11. The cooperation between the limiting groove 11 and the limiting block 51 can play a mechanical limiting role, which can control the movement boundary of the mounting part 5, thereby controlling the movement boundary of the curtain and improving the stability of the structure.

[0036] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A gearbox transmission mechanism, characterized in that: The device includes a housing, a drive assembly, a first gear transmission assembly, and a second gear transmission assembly. Both the first and second gear transmission assemblies are rotatably mounted on the housing. The drive assembly includes a motor and a first worm gear. The stator of the motor is fixedly mounted on the housing, and the rotor of the motor is connected to the first worm gear. The input end of the first gear transmission assembly is provided with a first helical gear, which meshes with the first worm gear. The output end of the first gear transmission assembly is connected to the input end of the second gear transmission assembly via a coupling, which is vertically arranged. The output end of the second gear transmission assembly is provided with a second worm gear and a second helical gear, which meshes with the second helical gear, and the second helical gear is mounted on an external device.

2. The gearbox transmission mechanism according to claim 1, characterized in that: The first gear transmission assembly includes a first gear, a second gear, a third gear, and a fourth gear. The first gear is a double gear and includes a spur gear and a first helical gear. The spur gear, the second gear, the third gear, and the fourth gear mesh sequentially. The fourth gear is connected to the input end of the coupling.

3. The gearbox transmission mechanism according to claim 2, characterized in that: Both the second gear and the third gear are double gears.

4. The gearbox transmission mechanism according to claim 1, characterized in that: The second gear transmission assembly includes a fifth gear, a sixth gear, and a seventh gear. The fifth gear is connected to the output end of the coupling and meshes with the sixth gear. The sixth gear is mounted on the second worm gear, and the seventh gear includes the second helical gear.

5. The gearbox transmission mechanism according to claim 4, characterized in that: There are two fifth gears, and the two fifth gears mesh with each other. One fifth gear is connected to the output end of the coupling, and the other fifth gear meshes with the sixth gear.

6. The gearbox transmission mechanism according to claim 1, characterized in that: The two ends of the second worm are rotatably connected to the housing via thrust bearings and first rolling bearings, respectively, and an angular contact bearing is provided near the worm teeth of the second worm.

7. The gearbox transmission mechanism according to claim 1, characterized in that: One end of the coupling is rotatably connected to the housing via a flange bearing.

8. The gearbox transmission mechanism according to claim 1, characterized in that: The second helical gear is rotatably connected to the housing via a second rolling bearing.

9. A vehicle-mounted projection screen, characterized in that: The device includes a mounting component and a gearbox transmission mechanism as described in any one of claims 1-8, wherein the second helical gear is mounted on the mounting component, and the mounting component is used to mount the curtain.

10. The vehicle-mounted projection screen according to claim 9, characterized in that: The housing is provided with a limiting groove, and the mounting component is provided with a limiting block below it. The limiting block is located in the limiting groove and abuts against one inner wall of the limiting groove.

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