Automobile ceiling suction screen

Abstract

The application discloses a car ceiling suction screen, which comprises a base mounted on a car ceiling and a display screen connected to the bottom side of the base, and a transmission structure is arranged between the display screen and the base, characterized in that the transmission structure comprises a rotating motor, a planetary gear box and a transmission shaft which are sequentially arranged and connected, the rotating motor and the planetary gear box are both mounted in a transmission sleeve, and the other end of the transmission shaft is fixedly connected to the shell of the ceiling suction screen; the first shaft sleeve and the second shaft sleeve are arranged on the two sides of the transmission sleeve respectively, the first shaft sleeve is sleeved on the outside of the transmission shaft, the shell of the ceiling suction screen is provided with the first hinged seat and the second hinged seat corresponding to the first shaft sleeve and the second shaft sleeve respectively, the first shaft sleeve and the second shaft sleeve are rotatably connected to the shell of the ceiling suction screen through the first hinged seat and the second hinged seat respectively, the display screen of the ceiling suction screen is fixedly connected with the first shaft sleeve and the second shaft sleeve, and the second shaft sleeve is fixedly connected with the rotating motor. The ceiling suction screen can be stably and smoothly rotated under the electric control.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to a car ceiling screen. Background Technology

[0002] With the advancement of technology and the improvement of people's living standards, more and more people are placing greater emphasis on the entertainment performance of cars. A ceiling-mounted screen is a type of in-vehicle comfort and entertainment device installed on the roof of a vehicle for playing multimedia information. Installed on the sun visor, it combines sun shading and viewing, offering diverse functions and is widely popular among consumers. To improve the automation performance of automobiles, patent document CN113602207 B discloses a multifunctional rotatable electric ceiling-mounted screen structure that can rotate electrically. Its rotation structure is achieved and supported by push rods on both sides of the rotating shaft. However, due to the limited installation space inside the car roof, and the need for the push rods to be installed diagonally within the roof, and the fact that the push rods sway during the rotation of the ceiling-mounted screen, the structure is complex, occupies a lot of space, and cannot meet the needs of vehicles with limited interior roof space. Furthermore, how to stably drive the ceiling-mounted screen to rotate electrically is also a problem that urgently needs to be solved. Summary of the Invention

[0003] This invention aims to solve the technical problems existing in the prior art, and innovatively proposes a car ceiling screen that can stably and smoothly control the rotation of the ceiling screen.

[0004] To achieve the above objectives, the present invention provides a car ceiling-mounted screen, comprising a base mounted on the top of a car roof and a display screen connected to the bottom side of the base. A transmission structure is provided between the display screen and the base. The transmission structure includes a rotating motor, a planetary gearbox, and a drive shaft arranged and connected in sequence. The rotating motor and the planetary gearbox are both installed inside a transmission sleeve. The other end of the drive shaft is fixedly connected to the housing of the ceiling-mounted screen. The screen also includes a first bushing and a second bushing located on both sides of the transmission sleeve, with the first bushing sleeve covering the drive shaft. The housing of the ceiling-mounted screen is provided with a first hinge seat and a second hinge seat corresponding to the first and second bushing sleeves, respectively. The first and second bushings are rotatably connected to the housing of the ceiling-mounted screen via the first and second hinge seats. The display screen of the ceiling-mounted screen is fixedly connected to both the first and second bushings, and the second bushing is fixedly connected to the rotating motor.

[0005] In the above scheme: both the second hinge seat and the first hinge seat are provided with horizontally communicating hinge holes, the ends of the first bushing and the second bushing both extend into the hinge holes, and the ends of the first bushing and the second bushing extending into the hinge holes are both provided with limiting baffles.

[0006] The hinge holes of the second hinge seat and the first hinge seat are stepped holes, and the first bushing and the second bushing are fitted inside the part with a larger inner diameter. The step of the hinge hole is provided with an arc-shaped limiting groove corresponding to the limiting plate, so that the limiting plate can only rotate within the arc-shaped limiting groove.

[0007] In the above scheme: the end of the drive shaft also extends into the hinge hole of the first hinge seat, and after the end of the drive shaft passes through the larger part of the hinge hole, it is fixed in the smaller part of the hinge hole of the first hinge seat by bolts; the drive shaft is also provided with an anti-rotation plane at one end of the first hinge seat, and an anti-rotation platform is provided in the hole of the first hinge seat corresponding to the anti-rotation plane.

[0008] In the above scheme: one end of the first bushing extends into the transmission sleeve, and the end is provided with a horizontally extending retaining tooth. The outer shell of the planetary gearbox is provided with a groove corresponding to the retaining tooth of the first bushing, and the retaining tooth and the groove are used to achieve the snap-fit.

[0009] In the above scheme: the planetary gearbox includes a sleeve, and at least three transmission planetary gear sets and one output planetary gear set are arranged sequentially from back to front inside the sleeve. The transmission planetary gear sets and the output planetary gear sets are connected and drive each other in sequence. The transmission planetary gear sets are all sleeved on the same central shaft. The front end of the sleeve is provided with an output through hole for the output gear sleeve of the output planetary gear set to extend out. The rear end of the sleeve is detachably provided with a rear end cover, and the rear end cover is provided with an input through hole for the input end of the motor to be inserted.

[0010] The central shaft is fixed on the planet carrier of any one of the middle transmission planetary gear sets. The planet carriers of the other transmission planetary gear sets are provided with through holes for the central shaft to pass through. The disk of the output planetary gear set planet carrier is provided with a front limiting structure for supporting the front end of the central shaft.

[0011] The transmission planetary gear set located at the rearmost side is the first-stage planetary gear set. The sleeve also has an internal gear ring that is sleeved outside the first-stage planetary gear set. All the planets of the first-stage planetary gear set mesh with the internal gear ring. A limiting through hole is opened in the center of the front end of the internal gear ring. A limiting boss matching the limiting through hole is provided on the front side of the planet carrier disk of the first-stage planetary gear set to form a rear limiting structure that supports the rear end of the central shaft. The limiting boss eliminates the gap between the planet carrier and the internal gear ring of the first-stage planetary gear set.

[0012] It also includes a motor and a PCB circuit board for controlling the motor. The motor is located on one side of the output gear sleeve and is connected to the output gear sleeve via a rotating shaft. The PCB circuit board includes a controller, a deserialization chip, a Bluetooth module, a power supply module, and a wake-up module. The power supply module is connected to the controller, the deserialization chip, the Bluetooth module, and the wake-up module, respectively, and provides power through the power supply module. The deserialization data terminal of the controller is connected to the deserialization data terminal of the deserialization chip, and the Bluetooth data receiving terminal of the deserialization chip is connected to the Bluetooth data transmitting terminal of the Bluetooth module. The wake-up signal input terminal of the wake-up module is connected to the ignition switch signal output terminal of the vehicle system, and the wake-up signal output terminal of the wake-up module is connected to the wake-up signal input terminal of the controller. The deserialization chip, the Bluetooth module, and the power supply module are activated through the controller U6.

[0013] It also includes interface J1, the controller TFT drive signal output terminal is connected to the interface J1 TFT drive signal input terminal, the interface J1 TFT drive signal output terminal is connected to the TFT screen interface J2 TFT drive signal input terminal, and an external TFT display screen is connected through the TFT screen interface J2.

[0014] In the above scheme: the wake-up module includes: the first end of resistor R3 is connected to the +3.3V power supply MCU and the emitter of transistor Q19; the second end of resistor R3 is connected to the first end of resistor R58 and the base of transistor Q19; the collector of transistor Q19 is connected to the first end of resistor R2 and the wake-up terminal of controller U6; the second end of resistor R2 is connected to power ground; the second end of resistor R58 is connected to the collector of transistor Q1; the emitter of transistor Q1 is connected to power ground; the base of transistor Q1 is connected to the first end of capacitor C61 and the first end of resistor R56; capacitor C61... The second terminal of resistor R56 and the second terminal of resistor R73 are both connected to the power supply ground. The base of transistor Q1 is connected to the first terminal of resistor R73. The second terminal of resistor R73 is connected to the cathode of diode D3. The anode of diode D3 is connected to the wake-up terminal of interface J3. The second terminal of resistor R73 is connected to the first terminal of resistor R59. The second terminal of resistor R59 is connected to the first terminal of resistor R60 and the first terminal of capacitor C59. The second terminals of resistor R60 and capacitor C59 are both connected to the power supply ground. The second terminal of resistor R59 is connected to the wake-up signal monitoring terminal PTC1 of controller U6.

[0015] In the above solution: the power supply module includes a power adapter circuit, a power sampling circuit, an MCU power supply circuit, and a Bluetooth power supply circuit.

[0016] In the above scheme: the power supply module includes a power adapter circuit, which includes a field-effect transistor Q17 whose drain is connected to the battery power supply terminal, one end of a transient voltage suppressor diode TVS1, and one end of a capacitor C65. The other end of capacitor C65 is connected to one end of capacitor C64. The other ends of capacitor C64 and the other ends of transient voltage suppressor diode TVS1 are both connected to power ground. The gate of the field-effect transistor Q17 is connected to one end of resistor R99, and the other end of resistor R99 is connected to power ground. The source of the field-effect transistor Q17... The circuit connects one end of resistor R100, the negative terminal of diode D8, one end of capacitor C91, one end of capacitor C177, and one end of inductor L3. The other end of capacitor C177 is connected to the power supply ground. The other end of resistor R100, the positive terminal of diode D8, and the other end of capacitor C91 are connected to one end of resistor R99. The other end of inductor L3 outputs the power supply +VBATT. The other end of inductor L3 is also connected to one end of capacitor C70 and one end of capacitor C62. The other ends of capacitor C70 and capacitor C62 are both connected to the power supply ground.

[0017] The power sampling circuit includes: the emitter of transistor Q2 is connected to the power supply BATTERY; the collector of transistor Q2 is connected to the first terminal of resistor R67; the second terminal of resistor R67 is connected to the first terminal of resistor R68 and the first terminal of capacitor C67; the second terminals of resistor R68 and capacitor C67 are both connected to the power supply ground; the second terminal of resistor R68 is connected to the voltage sampling terminal PTC0 of controller U6; the first terminal of resistor R71 is connected to the power supply BATTERY; the second terminal of resistor R71 is connected to the base of transistor Q2; the second terminal of resistor R71 is connected to the first terminal of resistor R66; the second terminal of resistor R66 is connected to the collector of transistor Q3; the emitter of transistor Q3 is connected to the power supply ground; the base of transistor Q3 is connected to the first terminal of resistor R70; the second terminal of resistor R70 is connected to the power supply ground; the base of transistor Q3 is connected to the first terminal of resistor R69; and the second terminal of resistor R69 is connected to the voltage sampling control terminal PTC16 of controller U6.

[0018] The emitter of transistor Q16 is connected to the power supply +VBATT. The collector of transistor Q16 is connected to the first terminal of resistor R217. The second terminal of resistor R217 is connected to the first terminal of resistor R216 and the first terminal of capacitor C141. The second terminals of resistor R216 and capacitor C141 are both connected to the power supply ground. The second terminal of resistor R217 is connected to the voltage sampling terminal PTB3 of controller U6. The first terminal of resistor R218 is connected to the power supply +VBATT. The second terminal of resistor R218 is connected to the base of transistor Q16. The second terminal of resistor R218 is connected to the first terminal of resistor R215. The second terminal of resistor R215 is connected to the second terminal of resistor R66.

[0019] In the above scheme: the power supply module further includes an MCU power supply circuit. The MCU power supply circuit includes a resistor R115 whose first terminal is connected to the power supply +VBATT; a resistor R115 whose second terminal is connected to the first terminals of capacitors C53, C58, and C54; a capacitor C53 whose second terminal, C58, and C54 are connected to the power supply ground; a resistor R115 whose second terminal is connected to the power supply terminal VIN of the DC-DC buck converter U2; and a bootstrap capacitor terminal BOOT of the DC-DC buck converter U2 whose first terminal is connected to the resistor R52. The second terminal of resistor R52 is connected to the first terminal of capacitor C48. The second terminal of capacitor C48 is connected to the output terminal SW of DC-DC buck converter U2. The output terminal SW of DC-DC buck converter U2 is connected to the first terminal of inductor L6. The second terminal of inductor L6 is connected to the first terminals of capacitors C49, C50, C51, and C52. The second terminals of capacitors C49, C50, C51, and C52 are connected to the power supply ground. The second terminal of inductor L6 outputs a +3.3V SW power supply. The second terminal of inductor L6 is connected to the first terminal of resistor R62. The second terminal of resistor R62 is connected to the first terminal of resistor R61. The second terminal of resistor R61 is connected to the first terminal of resistor R63 and the feedback terminal FB of DC-DC buck converter U2. The second terminal of resistor R63 is connected to the power supply ground. The enable terminal EN of DC-DC buck converter U2 is connected to the control terminal PTD16 of controller U6. The enable terminal EN of DC-DC buck converter U2 is connected to the first terminal of resistor R11. The second terminal of resistor R11 is connected to the power supply ground. The clock frequency terminal RT / C of DC-DC buck converter U2... LK is connected to the first terminal of resistor R51, the second terminal of resistor R51 is connected to the power supply ground, the heat dissipation terminal EPGND of DC-DC buck converter U2 is in contact with the heat dissipation pad of DC-DC buck converter U2, the power supply ground terminal GND of DC-DC buck converter U2 is connected to the power supply ground, the soft start terminal SOFT-START of DC-DC buck converter U2 is connected to the first terminal of capacitor C56 and the first terminal of capacitor C92 respectively, the second terminal of capacitor C92 is connected to the first terminal of resistor R101, and the second terminals of resistor R101 and capacitor C56 are connected to the power supply ground respectively.

[0020] In the above scheme: the power supply module further includes: the power supply terminal VIN of the linear regulator U5 is connected to the negative terminal of diode D13, the positive terminal of diode D13 is connected to the power supply +VBAT2, the power output terminal VOUT of the linear regulator U5 is connected to the first terminal of capacitor C115, the second terminal of capacitor C115 is connected to the power ground, the power output terminal VOUT of the linear regulator U5 outputs power +3.3V_MCU, the enable terminal EN of the linear regulator U5 is connected to the third terminal of high-speed switching diode D1 and one end of resistor R116, the other end of resistor R116 and the ground terminal of the linear regulator U5 are both connected to the power supply +VBAT2, the power output terminal VOUT of the linear regulator U5 is connected to the third terminal of high-speed switching diode D1 and one end of resistor R116, and the other end of resistor R116 and the ground terminal of the linear regulator U5 are both connected to the power supply +VBAT2. In the power supply ground, the first terminal of the high-speed switching diode D1 is connected to one end of resistor R31 and one end of capacitor C114, and the other end of capacitor C114 is connected to the power supply ground. The other end of resistor R31 is connected to the first end of resistor R165 and the first end of capacitor C116. The second ends of resistor R165 and capacitor C116 are respectively connected to the power supply ground. The second end of resistor R143 is connected to the negative terminal of diode D3. The power supply ground terminal GND of linear regulator U5 is connected to the power supply ground. The PG terminal of linear regulator U5 is connected to one end of resistor R108, and the other end of resistor R108 is connected to the reset terminal of controller U6.

[0021] The Bluetooth power supply circuit includes a resistor R48, one end of which is connected to the Bluetooth power enable terminal of the controller. The other end of the resistor R48 is connected to one end of the resistor R75, one end of the capacitor C98, and the base of the transistor Q10. The emitter of the transistor Q10, the other end of the resistor R75, and the other end of the capacitor C98 are all connected to the power ground. The collector of the transistor Q10 is connected to one end of the resistor R44. The other end of the resistor R44 is connected to one end of the resistor R43 and the base of the transistor Q7. The emitter of the transistor Q7 is connected to the other end of the resistor R43 and a 3.3V voltage. The collector of the transistor Q7 is connected to one end of the inductor L21. The other end of the inductor L21 is the Bluetooth power supply terminal, outputting a 3.3V voltage.

[0022] The Bluetooth module's Bluetooth data transmitting end is connected to one end of resistor R282 and one end of resistor R279. The other end of resistor R279 is connected to the Bluetooth power supply end of the Bluetooth power supply circuit. The other end of resistor R282 is connected to the Bluetooth data receiving end of the controller. The Bluetooth module's Bluetooth data receiving end is connected to one end of resistor R119 and one end of resistor R280. The other end of resistor R280 is connected to the Bluetooth power supply end of the Bluetooth power supply circuit. The other end of resistor R119 is connected to the Bluetooth data transmitting end of the controller.

[0023] The Bluetooth module's Bluetooth serial clock terminal is connected to one end of resistor R28, and the other end of resistor R28 is connected to the Bluetooth serial clock terminal of the deserialization chip. The Bluetooth module's Bluetooth serial output terminal is connected to one end of resistor R11, and the other end of resistor R11 is connected to the Bluetooth serial input terminal of the deserialization chip. The Bluetooth module's Bluetooth serial input terminal is connected to one end of resistor R27, and the other end of resistor R27 is connected to the Bluetooth serial output terminal of the deserialization chip. The Bluetooth module's Bluetooth serial data sampling frequency terminal is connected to one end of resistor R29, and the other end of resistor R29 is connected to the Bluetooth serial data sampling frequency terminal of the deserialization chip. The Bluetooth module's reset terminal is connected to one end of resistor R225, and the other end of resistor R225 is connected to the controller's Bluetooth reset model output terminal, one end of resistor R284, and one end of capacitor C100. The other end of capacitor C100 is connected to power ground. The other end of resistor R284 is connected to the Bluetooth power supply terminal of the Bluetooth power supply circuit, one end of capacitor C101, one end of capacitor C107, and the Bluetooth module's operating voltage input terminal. The other ends of capacitor C101, capacitor C107, and the Bluetooth module's ground terminal are all connected to power ground.

[0024] The Bluetooth module's ANT protocol terminal is connected to one end of inductor L23 and one end of capacitor C10. The other end of capacitor C10 is connected to power ground. The other end of inductor L23 is connected to one end of capacitor C102, one end of electrostatic diode ESD3, and the signal terminal of RF coaxial connector J8. The other ends of capacitor C102, the other end of electrostatic diode ESD3, and the ground terminal of RF coaxial connector J8 are all connected to power ground.

[0025] In summary, the beneficial effects of this invention are as follows: By fixing the drive shaft, the rotation of the motor drives the second bushing to rotate. Since the display screen is fixedly connected to the second bushing, the first and second bushings rotate, thus achieving the rotation of the display screen. The design is reasonable, the structure is compact, it occupies little space, and it is aesthetically pleasing. It can stably rotate the display screen and open it. Simultaneously, the PCB circuit board can stably and smoothly control the rotation of the ceiling-mounted screen. It can connect to a mobile terminal via a Bluetooth module to achieve Bluetooth screen projection. Furthermore, the data is decoded by a deserialization chip and displayed on a TFT display screen. This improves the entertainment and comfort of the driving experience and alleviates fatigue caused by long car rides. Using Bluetooth, compared to using mobile data or Wi-Fi, avoids connection drops due to lack of signal when the car enters a tunnel. The connection is stable, and the space inside the car fully meets the distance requirements for Bluetooth connections. The design is reasonable. Furthermore, it can connect to a mobile phone display screen via Bluetooth, allowing not only video viewing but also PPT presentations via mobile projection, making it suitable for business scenarios. Attached Figure Description

[0026] Figure 1 This is a perspective view of the planetary gearbox of the present invention.

[0027] Figure 2 This is a cross-sectional view of the planetary gearbox of the present invention.

[0028] Figure 3 This is a perspective view of the internal gear ring of the present invention.

[0029] Figure 4 This is a perspective view of the rear end cover of the present invention.

[0030] Figure 5 This is a perspective view of the planet carrier of the first-stage planetary gear set of the present invention.

[0031] Figure 6 This is a system schematic diagram of the present invention.

[0032] Figure 7 This is the circuit diagram of the controller.

[0033] Figure 8 This is the circuit diagram of the serializer chip U1.

[0034] Figure 9 This is the circuit diagram of filter L8.

[0035] Figure 10 This is the circuit diagram of the Bluetooth module.

[0036] Figure 11 This is a circuit diagram of a Bluetooth power supply circuit.

[0037] Figure 12 This is the circuit diagram for interface J1.

[0038] Figure 13 This is the circuit diagram of the common-mode filtering module.

[0039] Figure 14 This is a schematic diagram of the circuit connection of the voltage sampling circuit of the present invention.

[0040] Figure 15 This is a schematic diagram of the circuit connection of the voltage sampling circuit of the present invention.

[0041] Figure 16 This is the circuit diagram of the MCU power supply circuit.

[0042] Figure 17 This is the circuit diagram of the backlight chip.

[0043] Figure 18 This is the circuit diagram for the TFT screen interface J2.

[0044] Figure 19 This is a schematic diagram of the circuit connection of the CAN communication module of the present invention.

[0045] Figure 20 This is a schematic diagram of the circuit connection of the three-phase pre-drive module of the present invention.

[0046] Figure 21 This is a schematic diagram of the circuit connection of the display screen backlight module of the present invention.

[0047] Figure 22 This is a schematic diagram of the circuit connection of the J1 module of the present invention.

[0048] Figure 23 This is a schematic diagram of the circuit connection of the motor drive module of the present invention.

[0049] Figure 24 This is a schematic diagram of the circuit connection of the current sampling module of the present invention.

[0050] Figure 25 This is a schematic diagram of the circuit connection of the button module of the present invention.

[0051] Figure 26 This is a perspective view of the hinge mechanism of the cosmetic mirror of the present invention.

[0052] Figure 27 This is a cross-sectional view of the hinge mechanism of the cosmetic mirror of the present invention.

[0053] Figure 28 This is a schematic diagram of the structure of the present invention and the cosmetic mirror.

[0054] Figure 29 This is a schematic diagram of the installation of the invention, the cosmetic mirror, and the vehicle roof.

[0055] Figure 30 This is a schematic diagram of the structure of the makeup mirror socket.

[0056] Figure 31 This is a schematic diagram of the wiring structure of a space-saving car sun visor ceiling screen.

[0057] Figure 32 yes Figure 31 Sectional view of AA.

[0058] Figure 33 This is a schematic diagram of the cable and the inside of the housing.

[0059] Figure 34 This is a schematic diagram of the transmission structure of the present invention.

[0060] Figure 35 This is a schematic diagram of the present invention and the display screen.

[0061] Figure 36 This is a schematic diagram of the first bushing and the display screen.

[0062] Figure 37 This is a three-dimensional view of the first hinge seat and the drive shaft.

[0063] Figure 38 This is a schematic diagram of the ceiling-mounted screen assembly installation structure of the present invention. Detailed Implementation

[0064] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0065] like Figures 1 to 38 As shown, a car ceiling-mounted screen includes a base mounted on the top of a car roof and a display screen connected to the bottom side of the base. A transmission structure is provided between the display screen and the base. The transmission structure includes a rotating motor, a planetary gearbox, and a drive shaft arranged and connected in sequence. The rotating motor and the planetary gearbox are both installed in a transmission sleeve. The other end of the drive shaft is fixedly connected to the housing of the ceiling-mounted screen. It also includes a first bushing and a second bushing located on both sides of the transmission sleeve, with the first bushing sleeve covering the drive shaft. The housing of the ceiling-mounted screen is provided with a first hinge seat and a second hinge seat corresponding to the first bushing sleeve and the second bushing sleeve, respectively. The first bushing sleeve and the second bushing sleeve are rotatably connected to the housing of the ceiling-mounted screen through the first hinge seat and the second hinge seat, respectively. The display screen of the ceiling-mounted screen is fixedly connected to both the first bushing sleeve and the second bushing sleeve. The second bushing sleeve is fixedly connected to the rotating motor.

[0066] In the above scheme: both the second hinge seat and the first hinge seat are provided with horizontally communicating hinge holes, the ends of the first bushing and the second bushing both extend into the hinge holes, and the ends of the first bushing and the second bushing extending into the hinge holes are both provided with limiting baffles.

[0067] The hinge holes of the second hinge seat and the first hinge seat are stepped holes, and the first bushing and the second bushing are fitted inside the part with a larger inner diameter. The step of the hinge hole is provided with an arc-shaped limiting groove corresponding to the limiting plate, so that the limiting plate can only rotate within the arc-shaped limiting groove.

[0068] In the above scheme: the end of the drive shaft also extends into the hinge hole of the first hinge seat, and after the end of the drive shaft passes through the larger part of the hinge hole, it is fixed in the smaller part of the hinge hole of the first hinge seat by bolts; the drive shaft is also provided with an anti-rotation plane at one end of the first hinge seat, and an anti-rotation platform is provided in the hole of the first hinge seat corresponding to the anti-rotation plane.

[0069] In the above scheme: one end of the first bushing extends into the transmission sleeve, and the end is provided with a horizontally extending retaining tooth. The outer shell of the planetary gearbox is provided with a groove corresponding to the retaining tooth of the first bushing, and the retaining tooth and the groove are used to achieve the snap-fit.

[0070] In the above scheme: the planetary gearbox includes a sleeve, and at least three transmission planetary gear sets and one output planetary gear set are arranged sequentially from back to front inside the sleeve. The transmission planetary gear sets and the output planetary gear sets are connected and drive each other in sequence. The transmission planetary gear sets are all sleeved on the same central shaft. The front end of the sleeve is provided with an output through hole for the output gear sleeve of the output planetary gear set to extend out. The rear end of the sleeve is detachably provided with a rear end cover, and the rear end cover is provided with an input through hole for the input end of the motor to be inserted.

[0071] The central shaft is fixed on the planet carrier of any one of the middle transmission planetary gear sets. The planet carriers of the other transmission planetary gear sets are provided with through holes for the central shaft to pass through. The disk of the output planetary gear set planet carrier is provided with a front limiting structure for supporting the front end of the central shaft.

[0072] The transmission planetary gear set located at the rearmost side is the first-stage planetary gear set. The sleeve also has an internal gear ring that is sleeved outside the first-stage planetary gear set. All the planets of the first-stage planetary gear set mesh with the internal gear ring. A limiting through hole is opened in the center of the front end of the internal gear ring. A limiting boss matching the limiting through hole is provided on the front side of the planet carrier disk of the first-stage planetary gear set to form a rear limiting structure that supports the rear end of the central shaft. The limiting boss eliminates the gap between the planet carrier and the internal gear ring of the first-stage planetary gear set.

[0073] It also includes a motor and a PCB circuit board for controlling the motor. The motor is located on one side of the output gear sleeve and is connected to the output gear sleeve via a rotating shaft. The PCB circuit board includes a controller, a deserialization chip, a Bluetooth module, a power supply module, and a wake-up module. The power supply module is connected to the controller, the deserialization chip, the Bluetooth module, and the wake-up module, respectively, and provides power through the power supply module. The deserialization data terminal of the controller is connected to the deserialization data terminal of the deserialization chip, and the Bluetooth data receiving terminal of the deserialization chip is connected to the Bluetooth data transmitting terminal of the Bluetooth module. The wake-up signal input terminal of the wake-up module is connected to the ignition switch signal output terminal of the vehicle system, and the wake-up signal output terminal of the wake-up module is connected to the wake-up signal input terminal of the controller. The deserialization chip, the Bluetooth module, and the power supply module are activated through the controller U6.

[0074] It also includes interface J1, the controller TFT drive signal output terminal is connected to the interface J1 TFT drive signal input terminal, the interface J1 TFT drive signal output terminal is connected to the TFT screen interface J2 TFT drive signal input terminal, and an external TFT display screen is connected through the TFT screen interface J2.

[0075] In the above scheme: the wake-up module includes: the first end of resistor R3 is connected to the +3.3V power supply MCU and the emitter of transistor Q19; the second end of resistor R3 is connected to the first end of resistor R58 and the base of transistor Q19; the collector of transistor Q19 is connected to the first end of resistor R2 and the wake-up terminal of controller U6; the second end of resistor R2 is connected to power ground; the second end of resistor R58 is connected to the collector of transistor Q1; the emitter of transistor Q1 is connected to power ground; the base of transistor Q1 is connected to the first end of capacitor C61 and the first end of resistor R56; capacitor C61... The second terminal of resistor R56 and the second terminal of resistor R73 are both connected to the power supply ground. The base of transistor Q1 is connected to the first terminal of resistor R73. The second terminal of resistor R73 is connected to the cathode of diode D3. The anode of diode D3 is connected to the wake-up terminal of interface J3. The second terminal of resistor R73 is connected to the first terminal of resistor R59. The second terminal of resistor R59 is connected to the first terminal of resistor R60 and the first terminal of capacitor C59. The second terminals of resistor R60 and capacitor C59 are both connected to the power supply ground. The second terminal of resistor R59 is connected to the wake-up signal monitoring terminal PTC1 of controller U6.

[0076] In the above solution: the power supply module includes a power adapter circuit, a power sampling circuit, an MCU power supply circuit, and a Bluetooth power supply circuit.

[0077] In the above scheme: the power supply module includes a power adapter circuit, which includes a field-effect transistor Q17 whose drain is connected to the battery power supply terminal, one end of a transient voltage suppressor diode TVS1, and one end of a capacitor C65. The other end of capacitor C65 is connected to one end of capacitor C64. The other ends of capacitor C64 and the other ends of transient voltage suppressor diode TVS1 are both connected to power ground. The gate of the field-effect transistor Q17 is connected to one end of resistor R99, and the other end of resistor R99 is connected to power ground. The source of the field-effect transistor Q17... The circuit connects one end of resistor R100, the negative terminal of diode D8, one end of capacitor C91, one end of capacitor C177, and one end of inductor L3. The other end of capacitor C177 is connected to the power supply ground. The other end of resistor R100, the positive terminal of diode D8, and the other end of capacitor C91 are connected to one end of resistor R99. The other end of inductor L3 outputs the power supply +VBATT. The other end of inductor L3 is also connected to one end of capacitor C70 and one end of capacitor C62. The other ends of capacitor C70 and capacitor C62 are both connected to the power supply ground.

[0078] The power sampling circuit includes: the emitter of transistor Q2 is connected to the power supply BATTERY; the collector of transistor Q2 is connected to the first terminal of resistor R67; the second terminal of resistor R67 is connected to the first terminal of resistor R68 and the first terminal of capacitor C67; the second terminals of resistor R68 and capacitor C67 are both connected to the power supply ground; the second terminal of resistor R68 is connected to the voltage sampling terminal PTC0 of controller U6; the first terminal of resistor R71 is connected to the power supply BATTERY; the second terminal of resistor R71 is connected to the base of transistor Q2; the second terminal of resistor R71 is connected to the first terminal of resistor R66; the second terminal of resistor R66 is connected to the collector of transistor Q3; the emitter of transistor Q3 is connected to the power supply ground; the base of transistor Q3 is connected to the first terminal of resistor R70; the second terminal of resistor R70 is connected to the power supply ground; the base of transistor Q3 is connected to the first terminal of resistor R69; and the second terminal of resistor R69 is connected to the voltage sampling control terminal PTC16 of controller U6.

[0079] The emitter of transistor Q16 is connected to the power supply +VBATT. The collector of transistor Q16 is connected to the first terminal of resistor R217. The second terminal of resistor R217 is connected to the first terminal of resistor R216 and the first terminal of capacitor C141. The second terminals of resistor R216 and capacitor C141 are both connected to the power supply ground. The second terminal of resistor R217 is connected to the voltage sampling terminal PTB3 of controller U6. The first terminal of resistor R218 is connected to the power supply +VBATT. The second terminal of resistor R218 is connected to the base of transistor Q16. The second terminal of resistor R218 is connected to the first terminal of resistor R215. The second terminal of resistor R215 is connected to the second terminal of resistor R66.

[0080] In the above scheme: the power supply module further includes an MCU power supply circuit. The MCU power supply circuit includes a resistor R115 whose first terminal is connected to the power supply +VBATT; a resistor R115 whose second terminal is connected to the first terminals of capacitors C53, C58, and C54; a capacitor C53 whose second terminal, C58, and C54 are connected to the power supply ground; a resistor R115 whose second terminal is connected to the power supply terminal VIN of the DC-DC buck converter U2; and a bootstrap capacitor terminal BOOT of the DC-DC buck converter U2 whose first terminal is connected to the resistor R52. The second terminal of resistor R52 is connected to the first terminal of capacitor C48. The second terminal of capacitor C48 is connected to the output terminal SW of DC-DC buck converter U2. The output terminal SW of DC-DC buck converter U2 is connected to the first terminal of inductor L6. The second terminal of inductor L6 is connected to the first terminals of capacitors C49, C50, C51, and C52. The second terminals of capacitors C49, C50, C51, and C52 are connected to the power supply ground. The second terminal of inductor L6 outputs a +3.3V SW power supply. The second terminal of inductor L6 is connected to the first terminal of resistor R62. The second terminal of resistor R62 is connected to the first terminal of resistor R61. The second terminal of resistor R61 is connected to the first terminal of resistor R63 and the feedback terminal FB of DC-DC buck converter U2. The second terminal of resistor R63 is connected to the power supply ground. The enable terminal EN of DC-DC buck converter U2 is connected to the control terminal PTD16 of controller U6. The enable terminal EN of DC-DC buck converter U2 is connected to the first terminal of resistor R11. The second terminal of resistor R11 is connected to the power supply ground. The clock frequency terminal RT / C of DC-DC buck converter U2... LK is connected to the first terminal of resistor R51, the second terminal of resistor R51 is connected to the power supply ground, the heat dissipation terminal EPGND of DC-DC buck converter U2 is in contact with the heat dissipation pad of DC-DC buck converter U2, the power supply ground terminal GND of DC-DC buck converter U2 is connected to the power supply ground, the soft start terminal SOFT-START of DC-DC buck converter U2 is connected to the first terminal of capacitor C56 and the first terminal of capacitor C92 respectively, the second terminal of capacitor C92 is connected to the first terminal of resistor R101, and the second terminals of resistor R101 and capacitor C56 are connected to the power supply ground respectively.

[0081] In the above scheme: the power supply module further includes: the power supply terminal VIN of the linear regulator U5 is connected to the negative terminal of diode D13, the positive terminal of diode D13 is connected to the power supply +VBAT2, the power output terminal VOUT of the linear regulator U5 is connected to the first terminal of capacitor C115, the second terminal of capacitor C115 is connected to the power ground, the power output terminal VOUT of the linear regulator U5 outputs power +3.3V_MCU, the enable terminal EN of the linear regulator U5 is connected to the third terminal of high-speed switching diode D1 and one end of resistor R116, the other end of resistor R116 and the ground terminal of the linear regulator U5 are both connected to the power supply +VBAT2, the power output terminal VOUT of the linear regulator U5 is connected to the third terminal of high-speed switching diode D1 and one end of resistor R116, and the other end of resistor R116 and the ground terminal of the linear regulator U5 are both connected to the power supply +VBAT2. In the power supply ground, the first terminal of the high-speed switching diode D1 is connected to one end of resistor R31 and one end of capacitor C114, and the other end of capacitor C114 is connected to the power supply ground. The other end of resistor R31 is connected to the first end of resistor R165 and the first end of capacitor C116. The second ends of resistor R165 and capacitor C116 are respectively connected to the power supply ground. The second end of resistor R143 is connected to the negative terminal of diode D3. The power supply ground terminal GND of linear regulator U5 is connected to the power supply ground. The PG terminal of linear regulator U5 is connected to one end of resistor R108, and the other end of resistor R108 is connected to the reset terminal of controller U6.

[0082] The Bluetooth power supply circuit includes a resistor R48, one end of which is connected to the Bluetooth power enable terminal of the controller. The other end of the resistor R48 is connected to one end of the resistor R75, one end of the capacitor C98, and the base of the transistor Q10. The emitter of the transistor Q10, the other end of the resistor R75, and the other end of the capacitor C98 are all connected to the power ground. The collector of the transistor Q10 is connected to one end of the resistor R44. The other end of the resistor R44 is connected to one end of the resistor R43 and the base of the transistor Q7. The emitter of the transistor Q7 is connected to the other end of the resistor R43 and a 3.3V voltage. The collector of the transistor Q7 is connected to one end of the inductor L21. The other end of the inductor L21 is the Bluetooth power supply terminal, outputting a 3.3V voltage.

[0083] The Bluetooth module's Bluetooth data transmitting end is connected to one end of resistor R282 and one end of resistor R279. The other end of resistor R279 is connected to the Bluetooth power supply end of the Bluetooth power supply circuit. The other end of resistor R282 is connected to the Bluetooth data receiving end of the controller. The Bluetooth module's Bluetooth data receiving end is connected to one end of resistor R119 and one end of resistor R280. The other end of resistor R280 is connected to the Bluetooth power supply end of the Bluetooth power supply circuit. The other end of resistor R119 is connected to the Bluetooth data transmitting end of the controller.

[0084] The Bluetooth module's Bluetooth serial clock terminal is connected to one end of resistor R28, and the other end of resistor R28 is connected to the Bluetooth serial clock terminal of the deserialization chip. The Bluetooth module's Bluetooth serial output terminal is connected to one end of resistor R11, and the other end of resistor R11 is connected to the Bluetooth serial input terminal of the deserialization chip. The Bluetooth module's Bluetooth serial input terminal is connected to one end of resistor R27, and the other end of resistor R27 is connected to the Bluetooth serial output terminal of the deserialization chip. The Bluetooth module's Bluetooth serial data sampling frequency terminal is connected to one end of resistor R29, and the other end of resistor R29 is connected to the Bluetooth serial data sampling frequency terminal of the deserialization chip. The Bluetooth module's reset terminal is connected to one end of resistor R225, and the other end of resistor R225 is connected to the controller's Bluetooth reset model output terminal, one end of resistor R284, and one end of capacitor C100. The other end of capacitor C100 is connected to power ground. The other end of resistor R284 is connected to the Bluetooth power supply terminal of the Bluetooth power supply circuit, one end of capacitor C101, one end of capacitor C107, and the Bluetooth module's operating voltage input terminal. The other ends of capacitor C101, capacitor C107, and the Bluetooth module's ground terminal are all connected to power ground.

[0085] The Bluetooth module's ANT protocol terminal is connected to one end of inductor L23 and one end of capacitor C10. The other end of capacitor C10 is connected to power ground. The other end of inductor L23 is connected to one end of capacitor C102, one end of electrostatic diode ESD3, and the signal terminal of RF coaxial connector J8. The other ends of capacitor C102, the other end of electrostatic diode ESD3, and the ground terminal of RF coaxial connector J8 are all connected to power ground.

[0086] The PCB circuit board is equipped with a power module, a wake-up module, a voltage sampling module, a button module, a CAN communication module, a controller module, a deserializer module, a display backlight module, a three-phase pre-drive module, a motor drive module, and a current sampling module.

[0087] The power module is connected to one or any combination of the wake-up module, voltage sampling module, button module, CAN communication module, controller module, deserializer module, display backlight module, three-phase pre-drive module, motor drive module and current sampling module, respectively, to provide appropriate power or voltage signals to one or any combination of the wake-up module, voltage sampling module, button module, CAN communication module, controller module, deserializer module, display backlight module, three-phase pre-drive module, motor drive module and current sampling module;

[0088] The controller module is connected to one or any combination of the wake-up module, voltage sampling module, button module, CAN communication module, deserializer module, display backlight module, three-phase pre-drive module and current sampling module;

[0089] The drive terminal of the three-phase pre-drive module is connected to the drive terminal of the motor drive module, and the sampling terminal of the current sampling module is connected to the sampling terminal of the motor drive module.

[0090] The controller module enables signal acquisition and control of one or any combination of the wake-up module, voltage sampling module, button module, CAN communication module, deserializer module, display backlight module, three-phase pre-drive module, motor drive module, and current sampling module.

[0091] The button module includes: the first end of resistor R131 is connected to the power supply PWR_KEY; the second end of resistor R131 is connected to the folding signal terminal of interface J3; the second end of resistor R131 is connected to the first end of electrostatic discharge protection diode TVS1; the second end of electrostatic discharge protection diode TVS1 is connected to the first end of electrostatic discharge protection diode TVS2; the second end of electrostatic discharge protection diode TVS2 is connected to the unfolding signal terminal of interface J3; the first end of electrostatic discharge protection diode TVS2 is connected to the power supply ground; the second end of resistor R131 is connected to the first end of capacitor C98; the second end of capacitor C98 is connected to the power supply ground; the second end of resistor R131 is connected to the first end of resistor R133; the second end of resistor R133 is connected to the first end of resistor R151; the second end of resistor R151 is connected to the power supply ground; the second end of resistor R133 is connected to the first end of capacitor C101; the second end of capacitor C101 is connected to the power supply ground; and the second end of resistor R133 is connected to the folding signal acquisition terminal PTD7 of controller U6.

[0092] The first terminal of resistor R135 is connected to the power supply PWR_KEY. The second terminal of resistor R135 is connected to the first terminal of capacitor C99, and the second terminal of capacitor C99 is connected to the power supply ground. The second terminal of resistor R135 is connected to the unfold signal terminal of interface J3. The second terminal of resistor R135 is connected to the first terminal of resistor R134. The second terminal of resistor R134 is connected to the first terminals of resistor R150 and capacitor C100, respectively. The second terminals of resistor R150 and capacitor C100 are both connected to the power supply ground. The second terminal of resistor R134 is connected to the unfold signal acquisition terminal PTD6 of controller U6. The folding signal terminal of interface J3 is connected to the folding button, inputting a folding signal to the folding signal acquisition terminal PTD7 of controller U6; similarly, the unfolding signal terminal of interface J3 is connected to the unfolding button, inputting an unfolding signal to the unfolding signal acquisition terminal PTD6 of controller U6. Generally, the other terminals of the folding and unfolding buttons are connected to the power supply ground.

[0093] In a preferred embodiment of the present invention, the CAN communication module includes: as follows Figure 12As shown, the NC terminal of the communication chip U3 is connected to the +3.3V_MCU power supply, the first terminal of capacitor C142 is connected to the +3.3V_MCU power supply, the second terminal of capacitor C142 is connected to the power supply ground, the first terminals of capacitors C107 and C108 are connected to the VCC_5V power supply, the second terminals of capacitors C107 and C108 are connected to the power supply ground, and the VCC terminal of the communication chip U3 is connected to the VCC_5V power supply.

[0094] The data terminal CANH of communication chip U3 is connected to the first terminal of resistor R148, the second terminal of resistor R148 is connected to the first terminal of capacitor C63, the data terminal CANH of communication chip U3 is connected to the first terminal of resistor R152, the second terminal of resistor R152 is connected to the first terminal of capacitor C10, the second terminal of capacitor C10 is connected to power ground, the second terminal of resistor R152 is connected to the high-level data terminal of interface J3, and the second terminal of resistor R152 is connected to the first terminal of electrostatic protection diode D1.

[0095] The data terminal CANL of communication chip U3 is connected to the first terminal of resistor R149. The second terminal of resistor R149 is connected to the first terminal of capacitor C63. The second terminal of capacitor C63 is connected to the power supply ground. The data terminal CANL of communication chip U3 is connected to the first terminal of resistor R153. The second terminal of resistor R153 is connected to the first terminal of capacitor C60. The second terminal of capacitor C60 is connected to the power supply ground. The second terminal of resistor R153 is connected to the low-level data terminal of interface J3. The second terminal of resistor R153 is connected to the second terminal of electrostatic discharge protection diode D1. The common terminal of electrostatic discharge protection diode D1 is connected to the power supply ground.

[0096] The standby mode selection terminal STB-IN of communication chip U3 is connected to the control terminal PTE10 of controller U6. The data transmission terminal TXD-IN of communication chip U3 is connected to the first terminal of resistor R154, and the second terminal of resistor R154 is connected to the data receiving terminal PTE5 of controller U6. The data receiving terminal RXD-OUT of communication chip U3 is connected to the first terminal of resistor R155, and the second terminal of resistor R155 is connected to the data transmission terminal PTE4 of controller U6. It connects to the vehicle controller module or other modules via interface J3, enabling communication between controller U6 and the vehicle controller module or other modules using communication chip U3.

[0097] The three-phase pre-drive module includes: such as Figure 21 and 22As shown, the power supply terminal VIN of the pre-driver chip U8 is connected to the power supply +VBATT. The power supply terminal VIN of the pre-driver chip U8 is connected to the first terminal of capacitor C129. The second terminal of capacitor C129 is connected to the power supply ground. The power supply terminal VIN of the pre-driver chip U8 is connected to the first terminal of capacitor C40. The second terminal of capacitor C40 is connected to the power supply ground. The charge pump capacitor terminal CPA of the pre-driver chip U8 is connected to the first terminal of capacitor C30. The second terminal of capacitor C30 is connected to the charge pump capacitor terminal CPB of the pre-driver chip U8. The power supply source terminal VREG of the pre-driver chip U8 is connected to the first terminal of capacitor C31. The second terminal of capacitor C31 is connected to the power supply ground.

[0098] The high-level drive terminal GHA of phase A of pre-driver chip U8 is connected to the first terminal of resistor R57 and the negative terminal of diode D6; the low-level drive terminal GLA of phase A of pre-driver chip U8 is connected to the first terminal of resistor R158 and the negative terminal of diode D12; the high-level drive terminal GHB of phase B of pre-driver chip U8 is connected to the first terminal of resistor R82 and the negative terminal of diode D10; the low-level drive terminal GLB of phase B of pre-driver chip U8 is connected to the first terminal of resistor R159 and the negative terminal of diode D14; the high-level drive terminal GHC of phase C of pre-driver chip U8 is connected to the first terminal of resistor R157 and the negative terminal of diode D11; and the low-level drive terminal GLC of phase C of pre-driver chip U8 is connected to the first terminal of resistor R160 and the negative terminal of diode D15.

[0099] The overcurrent protection terminal LSS of the pre-driver chip U8 is connected to the overcurrent protection terminal OCP. The high-level A-phase terminal HA of the pre-driver chip U8 is connected to the first terminal of resistor R178, and the second terminal of resistor R178 is connected to the high-level A-phase terminal PTD2 of controller U6. The high-level B-phase terminal HB of the pre-driver chip U8 is connected to the first terminal of resistor R180, and the second terminal of resistor R180 is connected to the high-level B-phase terminal PTC6 of controller U6. The high-level C-phase terminal HC of the pre-driver chip U8 is connected to the first terminal of resistor R182, and the second terminal of resistor R182 is connected to controller U6. The high-level C-phase terminal PTE2 is connected; the low-level A-phase terminal LA of the pre-driver chip U8 is connected to the first terminal of resistor R179; the second terminal of resistor R179 is connected to the low-level A-phase terminal PTD3 of controller U6; the low-level B-phase terminal LB of the pre-driver chip U8 is connected to the first terminal of resistor R181; the second terminal of resistor R181 is connected to the low-level B-phase terminal PTC7 of controller U6; the low-level C-phase terminal LC of the pre-driver chip U8 is connected to the first terminal of resistor R183; and the second terminal of resistor R183 is connected to the low-level C-phase terminal PTE6 of controller U6.

[0100] The heat dissipation terminal GND of the pre-driver chip U8 is in contact with the heat dissipation pad of the pre-driver chip. The dead time terminal DT of the pre-driver chip U8 is connected to the first terminal of resistor R54. The second terminal of resistor R54 is connected to the power supply ground. The overcurrent input protection terminal OC_REF of the pre-driver chip U8 is connected to the first terminal of resistor R185. The second terminal of resistor R185 is connected to the power supply PWR_SOR. The first terminal of resistor R185 is connected to the first terminal of resistor R186. The second terminal of resistor R186 is connected to the power supply ground. The sleep mode terminal NSLEEP of the pre-driver chip U8 is connected to the sleep control terminal PTE8 of the controller U6. The fault indication terminal NFAULT of the pre-driver chip U8 is connected to the acquisition terminal PTB5 of the controller U6.

[0101] The capacitor terminal BSTA of the pre-driver chip U8 is connected to the first terminal of capacitor C32. The second terminal of capacitor C32 is connected to the A-phase terminal of the drive motor in interface J1. The second terminal of capacitor C32 is also connected to the capacitor terminal SHA of pre-driver chip U8. The capacitor terminal BSTB of pre-driver chip U8 is connected to the first terminal of capacitor C33. The second terminal of capacitor C33 is connected to the B-phase terminal of the drive motor in interface J1. The second terminal of capacitor C33 is also connected to the capacitor terminal SHB of pre-driver chip U8. The capacitor terminal BSTC of pre-driver chip U8 is connected to the first terminal of capacitor C34. The second terminal of capacitor C34 is connected to the C-phase terminal of the drive motor in interface J1. The second terminal of capacitor C34 is also connected to the capacitor terminal SHC of pre-driver chip U8. This connection between the drive motor and interface J1 provides pre-drive power and short-circuit protection, overcurrent protection, etc., for the three-phase drive motor.

[0102] In a preferred embodiment of the present invention, the motor drive module includes: as follows Figure 23 As shown, the first terminal of resistor R57 is connected to the high-level drive terminal GHA of phase A of pre-driver chip U8, the second terminal of resistor R57 is connected to the first terminal of resistor R172, the cathode of diode D6 is connected to the high-level drive terminal GHA of phase A of pre-driver chip U8, the anode of diode D6 is connected to the first terminal of resistor R172, the anode of diode D6 is connected to the first terminal of capacitor C122, the anode of diode D6 is connected to the gate of field-effect transistor Q8, the second terminals of resistor R172 and capacitor C122 are both connected to the source of field-effect transistor Q8, the drain of field-effect transistor Q8 is connected to the first terminals of capacitor C39 and capacitor C41, the second terminals of capacitor C39 and capacitor C41 are connected to the power supply ground, and the drain of field-effect transistor Q8 is connected to the power supply +VBATT.

[0103] The first terminal of resistor R82 is connected to the high-level drive terminal GHB of phase B of pre-driver chip U8. The second terminal of resistor R82 is connected to the first terminal of resistor R171 and the first terminal of capacitor C111. The cathode of diode D10 is connected to the high-level drive terminal GHB of phase B of pre-driver chip U8. The anode of diode D10 is connected to the second terminal of resistor R82. The first terminal of resistor R171 and the first terminal of capacitor C111 are connected to the gate of field-effect transistor Q12. The second terminal of resistor R171 and the second terminal of capacitor C111 are connected to the source of field-effect transistor Q12. The drain of field-effect transistor Q12 is connected to the power supply +VBATT.

[0104] The first terminal of resistor R157 is connected to the high-level drive terminal GHC of the C phase of pre-driver chip U8. The second terminal of resistor R157 is connected to the first terminal of resistor R170 and the first terminal of capacitor C112. The cathode of diode D11 is connected to the high-level drive terminal GHC of the C phase of pre-driver chip U8. The anode of diode D11 is connected to the second terminal of resistor R157. The first terminal of resistor R170 and the first terminal of capacitor C112 are connected to the gate of field-effect transistor Q14. The second terminal of resistor R170 and the second terminal of capacitor C112 are connected to the source of field-effect transistor Q14. The drain of field-effect transistor Q14 is connected to the power supply +VBATT.

[0105] The source of MOSFET Q8 is connected to the A-phase terminal of the drive motor of interface J1 and the first terminal of capacitor C138. The second terminal of capacitor C138 is connected to the power supply ground. The source of MOSFET Q12 is connected to the B-phase terminal of the drive motor of interface J1 and the first terminal of capacitor C139. The second terminal of capacitor C139 is connected to the power supply ground. The source of MOSFET Q14 is connected to the C-phase terminal of the drive motor of interface J1 and the first terminal of capacitor C140. The second terminal of capacitor C140 is connected to the power supply ground.

[0106] The cathode of diode D12 and the first terminal of resistor R158 are connected to the low-level drive terminal GLA of phase A of pre-driver chip U8, respectively. The anode of diode D12 and the second terminal of resistor R158 are both connected to the gate of field-effect transistor Q9. The anode of diode D12 is connected to the first terminal of resistor R167 and the first terminal of capacitor C121, respectively. The second terminal of resistor R167 and the second terminal of capacitor C121 are both connected to the source of field-effect transistor Q9. The drain of field-effect transistor Q9 is connected to the source of field-effect transistor Q8.

[0107] The cathode of diode D14 and the first terminal of resistor R159 are connected to the low-level drive terminal GLB of phase B of pre-driver chip U8, respectively. The anode of diode D14 and the second terminal of resistor R159 are both connected to the gate of field-effect transistor Q9. The anode of diode D14 is connected to the first terminal of resistor R168 and the first terminal of capacitor C120, respectively. The second terminal of resistor R168 and the second terminal of capacitor C120 are both connected to the source of field-effect transistor Q13. The drain of field-effect transistor Q13 is connected to the source of field-effect transistor Q12.

[0108] The cathode of diode D15 and the first terminal of resistor R160 are connected to the low-level drive terminal GLC of phase C of pre-driver chip U8, respectively. The anode of diode D15 and the second terminal of resistor R160 are connected to the first terminal of resistor R169 and the first terminal of capacitor C119, respectively. The anode of diode D15 is connected to the gate of field-effect transistor Q15. The second terminals of resistor R169 and capacitor C119 are both connected to the source of field-effect transistor Q15. The drain of field-effect transistor Q15 is connected to the source of field-effect transistor Q14.

[0109] The source of MOSFET Q9 is connected to the first terminal of resistor R192, the source of MOSFET Q9 is connected to the first terminal of resistor R187, the second terminal of resistor R187 is connected to the first terminal of resistor R50, and the second terminal of resistor R50 is connected to the power supply ground; the source of MOSFET Q13 is connected to the first terminal of resistor R199, the source of MOSFET Q13 is connected to the first terminal of resistor R188, and the second terminal of resistor R188 is connected to the first terminal of resistor R50; the source of MOSFET Q15 is connected to the first terminal of resistor R205, the source of MOSFET Q15 is connected to the first terminal of resistor R189, and the second terminal of resistor R189 is connected to the first terminal of resistor R50; the first terminal of capacitor C42 is connected to the first terminal of resistor R50, the second terminal of capacitor C42 is connected to the power supply ground, and the first terminal of capacitor C42 is the overcurrent protection terminal OCP. It may also include: the first terminal of resistor R162 connected to the drain of field-effect transistor Q8, the second terminal of resistor R162 connected to the first terminal of capacitor C46, ​​and the second terminal of capacitor C46 connected to the source of field-effect transistor Q8; the first terminal of resistor R166 connected to the drain of field-effect transistor Q9, the second terminal of resistor R166 connected to the first terminal of capacitor C110, and the second terminal of capacitor C110 connected to the source of field-effect transistor Q9; the first terminal of resistor R53 connected to the drain of field-effect transistor Q12, the second terminal of resistor R53 connected to the first terminal of capacitor C44, and the second terminal of capacitor C44 connected to the source of field-effect transistor Q12. The first terminal of resistor R164 is connected to the drain of MOSFET Q13, and the second terminal of resistor R164 is connected to the first terminal of capacitor C106, which in turn is connected to the source of MOSFET Q13. The first terminal of resistor R45 is connected to the drain of MOSFET Q14, and the second terminal of resistor R45 is connected to the first terminal of capacitor C43, which in turn is connected to the source of MOSFET Q14. The first terminal of resistor R163 is connected to the drain of MOSFET Q15, and the second terminal of resistor R163 is connected to the first terminal of capacitor C47, which in turn is connected to the source of MOSFET Q15. This drive circuit, composed of six MOSFETs (Q8, Q9, Q12, Q13, Q14, and Q15), provides power to the drive motor.

[0110] In a preferred embodiment of the present invention, the current sampling module includes: as follows Figure 24As shown, the A-phase output terminal OUT_A of sampling chip U11 is connected to the first terminal of resistor R190 and the sampling terminal PTB13 of controller U6, respectively. The A-phase input negative terminal -IN_A of sampling chip U11 is connected to the first terminal of resistor R195 and the second terminal of resistor R190, respectively. The second terminal of resistor R195 is connected to the first terminal of resistor R193. The second terminal of resistor R193 is connected to the overcurrent protection terminal OCP. The second terminal of resistor R195 is connected to the first terminal of capacitor C131. The second terminal of capacitor C131 is connected to the power supply ground. The second terminal of capacitor C131 is connected to the first terminal of capacitor C132. The second terminal of capacitor C132 is connected to the first terminal of resistor R192. The second terminal of resistor R192 is connected to the source of effect transistor Q9. The second terminal of capacitor C132 is connected to the first terminal of resistor R196. Resistor R1 The second terminal of 96 is connected to the positive terminal +IN_A of the A-phase input of sampling chip U11. The positive terminal +IN_A of the A-phase input of sampling chip U11 is connected to the first terminal of resistor R194. The second terminal of resistor R194 is connected to the first terminal of resistor R201. The second terminal of resistor R194 is connected to the first terminal of resistor R207. The second terminal of resistor R194 is connected to the positive terminal +IN_B of the B-phase input of sampling chip U11. The second terminal of resistor R194 is connected to the first terminal of resistor R191 and the first terminal of capacitor C133. The second terminals of resistor R191 and capacitor C133 are both connected to the power supply ground. The second terminal of resistor R194 is connected to the first terminal of resistor R197. The second terminal of resistor R197 is connected to the power supply PWR_SOR. The positive terminal V+ of the power supply of sampling chip U11 is connected to the power supply PWR_SOR.

[0111] The negative power supply terminal V- of sampling chip U11 is connected to power ground. The output terminal OUT_D of sampling chip U11 is connected to the sampling terminal PTB12 of controller U6. The output terminal OUT_D of sampling chip U11 is connected to the first terminal of resistor R198. The second terminal of resistor R198 is connected to the negative reference voltage input terminal -IN_D of sampling chip U11. The second terminal of resistor R198 is connected to the first terminal of resistor R202. The second terminal of resistor R202 is connected to the first terminal of capacitor C134. The second terminal of resistor R202 is connected to the first terminal of resistor R200. The second terminal of resistor R200 is connected to the overcurrent protection terminal OCP; the second terminal of capacitor C134 is connected to the power supply ground; the second terminal of capacitor C134 is connected to the first terminal of capacitor C135; the second terminal of capacitor C135 is connected to the first terminal of resistor R203; the second terminal of resistor R203 is connected to the positive input terminal +IN_D of sampling chip U11; the second terminal of resistor R203 is connected to the second terminal of resistor R201; the second terminal of capacitor C135 is connected to the first terminal of resistor R199; and the second terminal of resistor R199 is connected to the source of field-effect transistor Q13.

[0112] The positive terminal (+IN_C) of the C-phase input of sampling chip U11 is connected to the second terminal of resistor R207. The positive terminal (+IN_C) of the C-phase input of sampling chip U11 is connected to the first terminal of resistor R209. The second terminal of resistor R209 is connected to the first terminal of resistor R205. The second terminal of resistor R205 is connected to the source of field-effect transistor Q15. The second terminal of resistor R209 is connected to the first terminal of capacitor C136. The second terminal of capacitor C136 is connected to power ground. The second terminal of capacitor C136 is connected to the first terminal of capacitor C137. The second terminal of capacitor C137 is connected to the first terminal of resistor R206. The second terminal of resistor R206 is connected to the overcurrent protection terminal OCP. The second terminal of capacitor C137 is connected to the first terminal of resistor R208. The second terminal of resistor R208 is connected to the negative input terminal -IN_C of sampling chip U11. The second terminal of resistor R208 is connected to the first terminal of resistor R204. The second terminal of resistor R204 is connected to the output terminal OUT_C ​​of sampling chip U11. The second terminal of resistor R204 is connected to the sampling terminal PTD4 of controller U6. The output terminal OUT_B of sampling chip U11 is connected to the negative input terminal -IN_B of sampling chip U11. Sampling chip U11 is used to collect the current of the drive motor, ensuring the safety of the drive motor.

[0113] The back of the automotive ceiling screen is provided with a ceiling screen assembly mounting structure, including clamping protrusions 501 on the back of the automotive ceiling screen assembly. There are at least two clamping protrusions 501, respectively located on the left and right sides of the back of the automotive ceiling screen assembly. One of the clamping protrusions 501 extends forward and backward, while the other extends left and right. Each clamping protrusion 501 is equipped with a buckle 502 for fixing it to the car roof. The automotive ceiling screen assembly is inclined at the front and higher at the rear, with both clamping protrusions 501 located at the lower end of the automotive ceiling screen assembly.

[0114] To improve installation efficiency, the side wall of the portion of the automotive ceiling screen assembly used for embedding into the car roof is provided with a circumferential positioning groove 503. The positioning groove 503 can position and restrict the automotive ceiling screen assembly circumferentially, making installation convenient and quick.

[0115] To further enhance the snap-fit ​​structure and improve installation stability, a snap-fit ​​bracket 504 extending towards the car roof is centrally located on the back of the car ceiling screen assembly. The snap-fit ​​bracket 504 has snap-fit ​​holes and is snapped in place by fixing clips on the car roof.

[0116] The rear of the automotive ceiling-mounted screen assembly has positioning pins 505 extending towards the car's roof on both the left and right sides. These positioning pins 505 allow for positioning, further improving installation efficiency. The two positioning pins 505 are of different sizes.

[0117] The transmission structure includes a rotary motor 401, a planetary gearbox 402, and a drive shaft 403 arranged and connected in sequence. The rotary motor 401 and the planetary gearbox 402 are both installed inside the transmission sleeve 409, and the other end of the drive shaft 403 extends out of the transmission sleeve 409 and is fixedly connected to the housing of the ceiling screen.

[0118] It also includes a first bushing 405 and a second bushing 407 located on both sides of the transmission sleeve 409, with the first bushing 405 sleeved over the transmission shaft 403. The ceiling-mounted screen housing is provided with a first hinge seat 404 and a second hinge seat 408 corresponding to the first bushing 405 and the second bushing 407, respectively. The first bushing 405 and the second bushing 407 are rotatably connected to the ceiling-mounted screen housing via the first hinge seat 404 and the second hinge seat 408, respectively. The ceiling-mounted screen display is simultaneously fixedly connected to both the first bushing 405 and the second bushing 407. The second bushing 407 is located on the side of the rotating motor 401 away from the planetary gearbox 402, and is fixedly connected to the rotating motor 401.

[0119] The outer walls of the first bushing 405 and the second bushing 407 are both recessed outwards to provide fixing ears 412 for fixing the display screen. Each fixing ear 412 on the display screen is provided with a positioning pin 413, and each fixing ear 412 is provided with a positioning hole corresponding to the positioning pin 413.

[0120] Both the second hinge seat 408 and the first hinge seat 404 are provided with horizontally connected hinge holes. The ends of the first bushing 405 and the second bushing 407 extend into the hinge holes, and the ends of the first bushing 405 and the second bushing 407 that extend into the hinge holes are provided with limiting baffles 410.

[0121] The hinge holes of the second hinge seat 408 and the first hinge seat 404 are stepped holes, and the first bushing 405 and the second bushing 407 are fitted inside the larger inner diameter portion. An arc-shaped limiting groove 411 is provided on the step of the hinge hole corresponding to the limiting plate 410, ensuring that the limiting plate 410 can only rotate within the arc-shaped limiting groove 411. The rotation angle can be limited by the limiting plate 410 and the arc-shaped limiting groove 411. The central angle of the arc-shaped limiting groove 411 is between 120° and 150°. This large rotation range meets viewing requirements.

[0122] Specifically, the end of the drive shaft 403 also extends into the hinge hole of the first hinge seat 404, and after the end of the drive shaft 403 passes through the larger part of the hinge hole, it is fixed in the smaller part of the hinge hole of the first hinge seat 404 by bolts; the drive shaft 403 is also provided with an anti-rotation plane at one end of the first hinge seat 404, and an anti-rotation platform 404a is provided in the hole of the first hinge seat 404 corresponding to the anti-rotation plane.

[0123] To improve the connection stability of the first bushing 405, one end of the first bushing 405 extends into the transmission sleeve 409, and this end is provided with a horizontally extending retaining tooth 405a. The outer shell of the planetary gearbox 402 is provided with a groove corresponding to the retaining tooth 405a of the first bushing 405, and the retaining tooth 405a and the groove are used to achieve engagement. Multiple retaining teeth 405a are arranged circumferentially to improve connection stability.

[0124] A makeup mirror 103 is embedded in the lower side of the base. The makeup mirror 103 has hinge mechanisms on both its left and right sides for hinged connection with the base 1. Each hinge mechanism includes a hinge housing 101 mounted on the vehicle roof and a hinge shaft 102 mounted on the makeup mirror 103. The hinge housing 101 has a hinge hole on the side closest to the makeup mirror 103 for the hinge shaft 102 to connect to. An angle-maintaining member 104 is fitted onto one end of the hinge shaft 102 that extends into the hinge hole. The angle-maintaining member 104 allows the makeup mirror 103 to be suspended at any angle within its rotation range. The angle-maintaining member 104 can be a friction plate or a retaining spring, resulting in a simple structure.

[0125] A limiting protrusion 102a is provided in the middle of the hinge shaft 102 to prevent it from slipping out of the hinge hole. To prevent detachment, the outer diameter of the limiting protrusion 102a is larger than the inner diameter of the hinge hole. This prevents the hinge shaft 102 on one side from detaching due to excessive insertion into the hinge hole on the other side.

[0126] Specifically, the hinge shaft 102 is inserted into the makeup mirror 103. The left and right sides of the makeup mirror 103 are provided with connecting lugs 103a corresponding to the hinge shaft 102. The connecting lugs 103a are provided with insertion holes 103b for the end of the hinge shaft 102 to be inserted. The insertion holes 103b are blind holes, and the insertion holes 103b are provided with anti-rotation planes a. The end of the hinge shaft 102 that is inserted into the insertion holes 103b is also provided with anti-rotation planes a that match the insertion holes 103b.

[0127] The hinge housing 101 has mounting holes at both ends for mounting to the vehicle roof using screws 101a. To improve installation efficiency, each hinge housing 101 has a recessed positioning notch 101b on the side away from the vanity mirror 103. A positioning protrusion b is provided on the vehicle roof corresponding to the positioning notch 101b for pre-positioning, facilitating screw fixing. Each hinge housing 101 has two positioning notches 101b, located at both ends. This allows for positioning of both ends of the hinge housing 101, preventing tilting.

[0128] This invention also provides a space-saving wiring structure for a car sun visor ceiling screen, such as... Figures 31-33As shown, the PCB circuit board 201a is set inside the base housing 201. The bottom of the base housing 201 is provided with a pair of hinged lugs 201b. The rotating device is set between the two hinged lugs 201b. Both sides of the rotating device are provided with bushings that are hinged to the hinged lugs 201b. The display screen is fixedly connected to the two bushings. The output shaft of the motor 203 of the rotating device is connected to any one of the bushings, which is the rotating bushing 202a. The motor 203 drives the rotating bushing 202a to rotate.

[0129] Another bushing is a wiring bushing 202b. The motor 203 is located adjacent to the wiring bushing 202b. The wiring bushing 202b has a first through hole 202c that runs from left to right. The hinged lug 201b connected to the wiring bushing 202b is a hollow lug 201b'. The hollow lug 201b' has a second through hole 201f that communicates with the first through hole 202c. The first through hole 202c and the second through hole 201f form a wiring channel. The cable 204 of the motor 203 passes through the wiring channel and extends into the base housing 201, connecting to the PCB circuit board 201a. The side wall of the wiring bushing 202b has a cable outlet 202d. The display cable 204 extends from the cable outlet 202d into the wiring bushing 202b and connects to the PCB circuit board 201a inside the base housing 201 via the wiring channel.

[0130] The inner wall of the base housing 201 is provided with limiting grooves 201c for the cables 204 of the motor 203 and the display screen. The limiting grooves 201c can constrain the cables 204, preventing them from shifting or tangling. This design is reasonable and can also improve installation efficiency.

[0131] To improve the restraint effect and prevent cable 204 from shifting, the side wall of the limiting groove 201c is provided with intermittently protruding retaining ridges 201d, each retaining ridge 201d having an arc-shaped notch that matches the cable 204. Adjacent retaining ridges 201d are alternately arranged on the side walls of the limiting groove 201c. This reasonable arrangement allows the cable 204 to alternately abut against the side walls of the limiting groove 201c at different positions.

[0132] The cable 204 is positioned along the inner edge of the base housing 201, which makes the layout neater and allows for the space in the middle to be left empty for other items.

[0133] This invention also discloses a method for unfolding and folding a ceiling-mounted screen, comprising the following steps:

[0134] S1, ceiling-mounted screen activation;

[0135] S2, after the ceiling-mounted screen is activated, plays entertainment information on the ceiling-mounted screen.

[0136] In a preferred embodiment of the present invention, the following steps are included before activating the ceiling-mounted screen in step S1:

[0137] S01, Controller U6 determines whether its wake-up terminal PTD5 receives a first-level signal or a second-level signal:

[0138] If the wake-up terminal PTD5 of controller U6 receives the first level signal, controller U6 will wake up and proceed to the next step; the calculation method for the first level signal is as follows:

[0139]

[0140] Wherein, P1 represents the voltage value of the wake-up terminal PTD5 of the input controller U6, which is the first level signal;

[0141] This indicates the cutoff voltage of transistor Q1;

[0142] This indicates the preset voltage first adjustment threshold.

[0143] If the wake-up terminal PTD5 of controller U6 receives the second level signal, then controller U6 enters sleep mode and returns to step S01; the calculation method for the second level signal is as follows:

[0144]

[0145] Wherein, P2 represents the voltage value of the wake-up terminal PTD5 of the input controller U6, which is the second level signal;

[0146] V +3.3V_MCU This indicates the voltage of the +3.3V power supply to the MCU.

[0147] This indicates the preset voltage first adjustment threshold.

[0148]

[0149] S02, the control terminal PTD16 of controller U6 inputs an enable signal to the enable terminal EN of DC-DC buck converter U2; at this time, the power supply +VBATT input to DC-DC buck converter U2 is converted into a stable power supply +3.3VSW for output through DC-DC buck converter U2; proceed to the next step;

[0150] S03, the control terminal PTC2 of controller U6 inputs a conduction level to the base of transistor Q10, and transistor Q10 is in the conduction state. At this time, the base voltage of transistor Q11 is pulled low, and transistor Q11 is in the conduction state. The collector of transistor Q10 outputs power supply PWR_KEY.

[0151] S04, Controller U6 determines whether the unfold or fold button has been pressed:

[0152] If the unfold button is pressed, the ceiling-mounted screen will unfold;

[0153] If the fold button is pressed, the ceiling-mounted screen will fold up.

[0154] In a preferred embodiment of the present invention, the method for unfolding the ceiling-mounted screen in step S04 is as follows:

[0155] The controller U6 sends control signals to the three-phase pre-drive module and the motor drive module. After receiving the control signals from the controller U6, the three-phase pre-drive module and the motor drive module drive the motor to rotate forward. When the rotation angle of the rotating shaft reaches the preset rotation unfolding angle threshold, the drive motor stops working.

[0156] The method for folding the ceiling-mounted screen in step S04 is as follows:

[0157] The controller U6 sends control signals to the three-phase pre-drive module and the motor drive module. After receiving the control signals from the controller U6, the three-phase pre-drive module and the motor drive module drive the motor to reverse. When the rotation angle of the rotating shaft reaches the folding angle threshold, the drive motor stops working.

[0158] In a preferred embodiment of the present invention, after the ceiling-mounted screen is activated in step S2, the following steps are included:

[0159] S21, the control terminal PTC15 of controller U6 inputs a conduction level to the base of transistor Q4, and transistor Q4 is in the conduction state. At this time, the gate voltage of field-effect transistor Q5 is pulled low, and field-effect transistor Q5 is in the conduction state. The power supply +3.3VSW on the source of field-effect transistor Q5 is output as power supply +3.3V_TFT through the drain of field-effect transistor Q5.

[0160] S22, the controller U6 sends the display startup screen to the ceiling screen through the deserialization chip U1, and displays the ceiling screen startup screen on the ceiling screen.

[0161] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A car ceiling-mounted screen, comprising a base mounted on the top of a car roof and a display screen connected to the bottom side of the base, wherein a transmission structure is provided between the display screen and the base, characterized in that: The transmission structure includes a rotating motor (401), a planetary gearbox (402), and a transmission shaft (403) arranged and connected in sequence. The rotating motor (401) and the planetary gearbox (402) are both installed inside a transmission sleeve (409). The characteristic feature is that the other end of the transmission shaft (403) is fixedly connected to the housing of the ceiling-mounted screen; it also includes a first bushing (405) and a second bushing (407) located on both sides of the transmission sleeve (409), with the first bushing (405) sleeved over the transmission shaft (403). The housing of the ceiling screen is provided with a first hinge seat (404) and a second hinge seat (408) corresponding to the first bushing (405) and the second bushing (407). The first bushing (405) and the second bushing (407) are rotatably connected to the housing of the ceiling screen through the first hinge seat (404) and the second hinge seat (408), respectively. The display screen of the ceiling screen is fixedly connected to the first bushing (405) and the second bushing (407). The second bushing (407) is fixedly connected to the rotating motor (401). The planetary gearbox (402) includes a sleeve (5), in which at least three transmission planetary gear sets and one output planetary gear set (4) are arranged sequentially from back to front. The transmission planetary gear sets and the output planetary gear set (4) are connected and drive in sequence. The transmission planetary gear sets are all sleeved on the same central shaft (8). The central shaft (8) is fixed on the planet carrier of any one of the transmission planetary gear sets in the middle. The planet carriers of the other transmission planetary gear sets are provided with through holes for the central shaft (8) to pass through. The disk of the planet carrier of the output planetary gear set (4) is provided with a front limiting structure for supporting the front end of the central shaft (8). The transmission planetary gear set located at the rear is the first-stage planetary gear set (1). The sleeve (5) is also provided with an internal gear ring (7) that is sleeved outside the first-stage planetary gear set (1). All the planetary gears of the first-stage planetary gear set (1) mesh with the internal gear ring (7). A limiting through hole (7a) is provided in the center of the front end of the internal gear ring (7). A limiting boss (1a) matching the limiting through hole (7a) is provided on the front side of the planet carrier disk of the first-stage planetary gear set (1) to form a rear limiting structure that supports the rear end of the central shaft (8). The gap between the planet carrier of the first-stage planetary gear set (1) and the internal gear ring (7) is eliminated by the limiting boss (1a).

2. The car ceiling-mounted screen according to claim 1, characterized in that: Both the second hinge seat (408) and the first hinge seat (404) are provided with horizontally connected hinge holes. The ends of the first bushing (405) and the second bushing (407) extend into the hinge holes, and the ends of the first bushing (405) and the second bushing (407) that extend into the hinge holes are provided with limiting baffles (410). The hinge holes of the second hinge seat (408) and the first hinge seat (404) are stepped holes, and the first bushing (405) and the second bushing (407) are fitted inside the part with a larger inner diameter. The step of the hinge hole is provided with an arc-shaped limiting groove (411) corresponding to the limiting plate (410), so that the limiting plate (410) can only rotate in the arc-shaped limiting groove (411).

3. The automotive ceiling-mounted screen according to claim 1, characterized in that: The end of the drive shaft (403) also extends into the hinge hole of the first hinge seat (404), and after the end of the drive shaft (403) passes through the larger part of the hinge hole, it is fixed by bolts in the smaller part of the hinge hole of the first hinge seat (404); the drive shaft (403) is also provided with an anti-rotation plane at one end of the first hinge seat (404), and an anti-rotation platform (404a) is provided in the hole of the first hinge seat (404) corresponding to the anti-rotation plane.

4. The automotive ceiling-mounted screen according to claim 1, characterized in that: One end of the first bushing (405) extends into the transmission sleeve (409), and the end is provided with a horizontally extending locking tooth (405a). The outer shell of the planetary gearbox (402) is provided with a groove corresponding to the locking tooth (405a) of the first bushing (405), and the locking is achieved by the locking tooth (405a) and the groove.

5. The automotive ceiling-mounted screen according to claim 1, characterized in that: The front end of the sleeve (5) is provided with an output through hole for the output gear sleeve (4b) of the output planetary gear set (4) to extend out. The rear end of the sleeve (5) is provided with a detachable rear end cover (6). The rear end cover (6) is provided with an input through hole for the input end of the motor to be inserted.

6. The automotive ceiling-mounted screen according to claim 1, characterized in that: It also includes a motor and a PCB circuit board for controlling the motor. The motor is located on one side of the output gear sleeve (4b) and is connected to the output gear sleeve (4b) via a rotating shaft. The PCB circuit board includes a controller (U6), a deserialization chip (U1), a Bluetooth module, a power supply module, and a wake-up module. The power supply module is connected to the controller (U6), the deserialization chip (U1), the Bluetooth module, and the wake-up module, respectively, and provides power through the power supply module. The deserialization data terminal of the controller (U6) is connected to the deserialization data terminal of the deserialization chip (U1), and the Bluetooth data receiving terminal of the deserialization chip (U1) is connected to the Bluetooth data transmitting terminal of the Bluetooth module. The wake-up signal input terminal of the wake-up module is connected to the ignition switch signal output terminal of the vehicle system, and the wake-up signal output terminal of the wake-up module is connected to the wake-up signal input terminal of the controller (U6). The controller U6 starts the deserialization chip (U1), the Bluetooth module, and the power supply module. It also includes interface J1, the controller (U6) TFT drive signal output terminal is connected to the interface J1 TFT drive signal input terminal, the interface J1 TFT drive signal output terminal is connected to the TFT screen interface J2 TFT drive signal input terminal, and an external TFT screen is connected through the TFT screen interface J2.

7. The automotive ceiling-mounted screen according to claim 6, characterized in that: The wake-up module includes: the first terminal of resistor R3 is connected to the +3.3V power supply (MCU) and the emitter of transistor Q19; the second terminal of resistor R3 is connected to the first terminal of resistor R58 and the base of transistor Q19; the collector of transistor Q19 is connected to the first terminal of resistor R2 and the wake-up terminal of controller U6; the second terminal of resistor R2 is connected to power ground; the second terminal of resistor R58 is connected to the collector of transistor Q1; the emitter of transistor Q1 is connected to power ground; the base of transistor Q1 is connected to the first terminal of capacitor C61 and the first terminal of resistor R56; the second terminal of capacitor C61... The second terminal of resistor R56 and the second terminal of resistor R73 are both connected to the power supply ground. The base of transistor Q1 is connected to the first terminal of resistor R73. The second terminal of resistor R73 is connected to the cathode of diode D3. The anode of diode D3 is connected to the wake-up terminal of interface J3. The second terminal of resistor R73 is connected to the first terminal of resistor R59. The second terminal of resistor R59 is connected to the first terminal of resistor R60 and the first terminal of capacitor C59. The second terminals of resistor R60 and capacitor C59 are both connected to the power supply ground. The second terminal of resistor R59 is connected to the wake-up signal monitoring terminal PTC1 of controller U6.

8. The automotive ceiling-mounted screen according to claim 6, characterized in that: The power supply module includes a power adapter circuit, a power sampling circuit, an MCU power supply circuit, and a Bluetooth power supply circuit.

9. A car ceiling-mounted screen according to claim 8, characterized in that: The power supply module includes a power adapter circuit, which comprises a field-effect transistor Q17 with its drain connected to the battery power supply terminal, one end of a transient voltage suppressor diode (TVS1), and one end of a capacitor C65. The other end of capacitor C65 is connected to one end of capacitor C64. The other ends of capacitor C64 and TVS1 are both connected to power ground. The gate of the field-effect transistor Q17 is connected to one end of a resistor R99, and the other end of resistor R99 is connected to power ground. The source of the field-effect transistor Q17 is connected to... One end of resistor R100, the negative terminal of diode D8, one end of capacitor C91, one end of capacitor C177, and one end of inductor L3 are connected. The other end of capacitor C177 is connected to the power supply ground. The other end of resistor R100, the positive terminal of diode D8, and the other end of capacitor C91 are connected to one end of resistor R99. The other end of inductor L3 outputs the power supply +VBATT. The other end of inductor L3 is also connected to one end of capacitor C70 and one end of capacitor C62. The other ends of capacitor C70 and capacitor C62 are both connected to the power supply ground. The power sampling circuit includes: the emitter of transistor Q2 is connected to the power supply BATTERY; the collector of transistor Q2 is connected to the first terminal of resistor R67; the second terminal of resistor R67 is connected to the first terminal of resistor R68 and the first terminal of capacitor C67; the second terminals of resistor R68 and capacitor C67 are both connected to the power supply ground; the second terminal of resistor R68 is connected to the voltage sampling terminal PTC0 of controller U6; the first terminal of resistor R71 is connected to the power supply BATTERY; the second terminal of resistor R71 is connected to the base of transistor Q2; the second terminal of resistor R71 is connected to the first terminal of resistor R66; the second terminal of resistor R66 is connected to the collector of transistor Q3; the emitter of transistor Q3 is connected to the power supply ground; the base of transistor Q3 is connected to the first terminal of resistor R70; the second terminal of resistor R70 is connected to the power supply ground; the base of transistor Q3 is connected to the first terminal of resistor R69; and the second terminal of resistor R69 is connected to the voltage sampling control terminal PTC16 of controller U6. The emitter of transistor Q16 is connected to the power supply +VBATT. The collector of transistor Q16 is connected to the first terminal of resistor R217. The second terminal of resistor R217 is connected to the first terminal of resistor R216 and the first terminal of capacitor C141. The second terminals of resistor R216 and capacitor C141 are both connected to the power supply ground. The second terminal of resistor R217 is connected to the voltage sampling terminal PTB3 of controller U6. The first terminal of resistor R218 is connected to the power supply +VBATT. The second terminal of resistor R218 is connected to the base of transistor Q16. The second terminal of resistor R218 is connected to the first terminal of resistor R215. The second terminal of resistor R215 is connected to the second terminal of resistor R66.

10. A car ceiling-mounted screen according to claim 8, characterized in that: The power supply module also includes an MCU power supply circuit. The MCU power supply circuit includes a resistor R115 whose first terminal is connected to the +VBATT power supply; a resistor R115 whose second terminal is connected to the first terminals of capacitors C53, C58, and C54; and capacitors C53, C58, and C54 whose second terminals are connected to the power supply ground. The second terminal of resistor R115 is connected to the VIN power supply terminal of the DC-DC buck converter U2. The bootstrap capacitor terminal BOOT of the DC-DC buck converter U2 is connected to the first terminal of resistor R52. The second terminal of capacitor C48 is connected to the first terminal of capacitor C48. The second terminal of capacitor C48 is connected to the output terminal SW of DC-DC buck converter U2. The output terminal SW of DC-DC buck converter U2 is connected to the first terminal of inductor L6. The second terminal of inductor L6 is connected to the first terminals of capacitors C49, C50, C51, and C52. The second terminals of capacitors C49, C50, C51, and C52 are connected to the power supply ground. The second terminal of inductor L6 outputs +3.3VSW. The second terminal of resistor R62 is connected to the first terminal of resistor R62. The second terminal of resistor R62 is connected to the first terminal of resistor R61. The second terminal of resistor R61 is connected to the first terminal of resistor R63 and the feedback terminal FB of DC-DC buck converter U2. The second terminal of resistor R63 is connected to the power supply ground. The enable terminal EN of DC-DC buck converter U2 is connected to the control terminal PTD16 of controller U6. The enable terminal EN of DC-DC buck converter U2 is connected to the first terminal of resistor R11. The second terminal of resistor R11 is connected to the power supply ground. The clock frequency terminal RT / CLK of DC-DC buck converter U2 is connected to the power supply ground. The first terminal of resistor R51 is connected to the power supply ground. The second terminal of resistor R51 is connected to the power supply ground. The heat dissipation terminal EPGND of DC-DC buck converter U2 is in contact with the heat dissipation pad of DC-DC buck converter U2. The power supply ground terminal GND of DC-DC buck converter U2 is connected to the power supply ground. The soft start terminal SOFT-START of DC-DC buck converter U2 is connected to the first terminal of capacitor C56 and the first terminal of capacitor C92 respectively. The second terminal of capacitor C92 is connected to the first terminal of resistor R101. The second terminals of resistor R101 and capacitor C56 are connected to the power supply ground respectively.

11. A car ceiling-mounted screen according to claim 8, characterized in that: The power supply module further includes: the power supply terminal VIN of the linear regulator U5 is connected to the negative terminal of diode D13, the positive terminal of diode D13 is connected to the power supply +VBAT2, the power output terminal VOUT of the linear regulator U5 is connected to the first terminal of capacitor C115, the second terminal of capacitor C115 is connected to the power supply ground, the power output terminal VOUT of the linear regulator U5 outputs power supply +3.3V_MCU, the enable terminal EN of the linear regulator U5 is connected to the third terminal of high-speed switching diode D1 and one end of resistor R116, the other end of resistor R116 and the ground terminal of the linear regulator U5 are both connected to the power supply ground. The first terminal of the high-speed switching diode D1 is connected to one end of resistor R31 and one end of capacitor C114. The other end of capacitor C114 is connected to the power supply ground. The other end of resistor R31 is connected to the first end of resistor R165 and the first end of capacitor C116. The second ends of resistor R165 and capacitor C116 are respectively connected to the power supply ground. The second end of resistor R143 is connected to the negative terminal of diode D3. The power supply ground terminal GND of linear regulator U5 is connected to the power supply ground. The PG terminal of linear regulator U5 is connected to one end of resistor R108. The other end of resistor R108 is connected to the reset terminal of controller U6. The Bluetooth power supply circuit includes a resistor R48, one end of which is connected to the Bluetooth power enable terminal of the controller (U6). The other end of the resistor R48 is connected to one end of the resistor R75, one end of the capacitor C98, and the base of the transistor Q10. The emitter of the transistor Q10, the other end of the resistor R75, and the other end of the capacitor C98 are all connected to the power ground. The collector of the transistor Q10 is connected to one end of the resistor R44. The other end of the resistor R44 is connected to one end of the resistor R43 and the base of the transistor Q7. The emitter of the transistor Q7 is connected to the other end of the resistor R43 and a 3.3V voltage. The collector of the transistor Q7 is connected to one end of the inductor L21. The other end of the inductor L21 is the Bluetooth power supply terminal, outputting a 3.3V voltage. The Bluetooth module (U3) Bluetooth data transmitting end is connected to one end of resistor R282 and one end of resistor R279. The other end of resistor R279 is connected to the Bluetooth power supply end of the Bluetooth power supply circuit. The other end of resistor R282 is connected to the Bluetooth data receiving end of the controller (U6). The Bluetooth module (U3) Bluetooth data receiving end is connected to one end of resistor R119 and one end of resistor R280. The other end of resistor R280 is connected to the Bluetooth power supply end of the Bluetooth power supply circuit. The other end of resistor R119 is connected to the Bluetooth data transmitting end of the controller (U6). The Bluetooth module (U3) has its Bluetooth serial clock terminal connected to one end of resistor R28, and the other end of resistor R28 connected to the Bluetooth serial clock terminal of the deserialization chip (U1). The Bluetooth module (U3)'s Bluetooth serial output terminal is connected to one end of resistor R11, and the other end of resistor R11 connected to the Bluetooth serial input terminal of the deserialization chip (U1). The Bluetooth module (U3)'s Bluetooth serial input terminal is connected to one end of resistor R27, and the other end of resistor R27 connected to the Bluetooth serial output terminal of the deserialization chip (U1). The Bluetooth module (U3)'s Bluetooth serial data sampling frequency terminal is connected to one end of resistor R29, and the other end of resistor R29 connected to the deserialization chip (U1). The serial chip (U1) is connected to the Bluetooth serial data sampling frequency terminal. The reset terminal of the Bluetooth module (U3) is connected to one end of resistor R225. The other end of resistor R225 is connected to the Bluetooth reset model output terminal of the controller (U6), one end of resistor R284 and one end of capacitor C100. The other end of capacitor C100 is connected to the power supply ground. The other end of resistor R284 is connected to the Bluetooth power supply terminal of the Bluetooth power supply circuit, one end of capacitor C101, one end of capacitor C107 and the working voltage input terminal of Bluetooth module (U3). The other ends of capacitor C101, the other end of capacitor C107 and the ground terminal of Bluetooth module (U3) are all connected to the power supply ground. The Bluetooth module (U3) ANT protocol terminal is connected to one end of inductor L23 and one end of capacitor C10. The other end of capacitor C10 is connected to power ground. The other end of inductor L23 is connected to one end of capacitor C102, one end of electrostatic diode ESD3 and the signal terminal of RF coaxial connector J8. The other ends of capacitor C102, the other end of electrostatic diode ESD3 and the ground terminal of RF coaxial connector J8 are all connected to power ground.

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