Transmission mechanism for ceiling screen

Abstract

The utility model provides a transmission mechanism for a ceiling screen, and relates to the vehicle-mounted field. The transmission mechanism comprises a motor, a display assembly, a planetary gear speed reduction module and a small-tooth-difference speed reduction module. The small-tooth-difference speed reduction module comprises a first outer gear and a first inner gear ring meshed with the first outer gear, the first outer gear eccentrically rotates in the first inner gear ring, and the tooth number of the first outer gear is smaller than that of the first inner gear ring; wherein the planetary gear speed reduction module and the small tooth difference speed reduction module are arranged between the motor and the display assembly. According to the utility model, the combination of the planetary gear speed reduction module and the small tooth difference speed reduction module is adopted, so that the power is transmitted to the display assembly from the motor, and meanwhile, through the combined action of the planetary gear speed reduction module and the small tooth difference speed reduction module, a remarkable speed reduction ratio is realized, so that the display assembly can operate at a lower rotating speed; and the torque is correspondingly increased, so that the overturning, adjustment or other expected actions of the screen are realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of vehicle-mounted, especially relates to a transmission mechanism for ceiling screen. BACKGROUND

[0002] At present, the multi-screen partition trend of vehicle-mounted screen is increasingly obvious, especially the configuration proportion of rear screen increases year by year, and the screen size also presents a significant growth trend. This makes higher requirements for the output torque, running smoothness and compactness of the structure size of the screen turnover mechanism.

[0003] In the prior art, the screen transmission mechanism mainly relies on multi-stage gear transmission and worm gear transmission technical means. However, the multi-stage gear transmission and worm gear transmission structure setting makes the overall structure large, and the reduction efficiency is not ideal. SUMMARY

[0004] Therefore, the utility model provides a transmission mechanism for ceiling screen, which aims to improve the compactness of the transmission mechanism while realizing greater reduction ratio.

[0005] The technical scheme of the utility model is as follows:

[0006] The utility model embodiment provides a transmission mechanism for ceiling screen, including: motor and display component;Planetary gear reduction module, including sun gear, drive connection the sun gear's planetary gear and the planet carrier that connects the planetary gear. And, the small tooth difference reduction module includes the first external gear and the first internal tooth ring that is engaged with the first external gear, the first external gear eccentric rotation in the first internal tooth ring, and the tooth number of the first external gear is less than the tooth number of the first internal tooth ring. Wherein, the sun gear drive connection motor, the planet carrier drive connection the first external gear, the first internal tooth ring drive connection display component. Or, the first external gear drive connection motor, the first internal tooth ring drive connection sun gear, the planet carrier drive connection display component.

[0007] In an embodiment, the motor, the planetary gear reduction module, the small tooth difference reduction module and the display component are sequentially arranged along a first direction.

[0008] In an embodiment, the small-tooth-difference reduction module further comprises a second outer gear and a second inner ring gear engaged with the second outer gear, the second outer gear and the second inner ring gear are arranged between the first inner ring gear and the planet carrier; the second outer gear is fixedly connected to the first outer gear, the second inner ring gear is fixed to the inner side of the housing, and the second outer gear is connected to the planet carrier; the second outer gear rotates eccentrically in the second inner ring gear, and the number of teeth of the second outer gear is less than the number of teeth of the second inner ring gear.

[0009] In an embodiment, the small-tooth-difference reduction module further comprises a transmission shaft, the transmission shaft has a connecting shaft section and an eccentric shaft section, the rotation axes of the connecting shaft section and the eccentric shaft section are offset; the first outer gear and the second outer gear are respectively sleeved on the eccentric shaft section along the extension direction of the eccentric shaft section; and the planet carrier is connected to the connecting shaft section.

[0010] In an embodiment, the small-tooth-difference reduction module further comprises a rotating disc arranged vertically, the rotating disc is provided with a mounting groove on the side facing the motor, and an extension shaft connected to the side of the rotating disc away from the motor; wherein the first inner ring gear is rotationally mounted in the mounting groove, and the extension shaft is connected to the display assembly.

[0011] In an embodiment, the groove wall of the mounting groove is formed with an opening, the opening communicates the inner side and the outer side of the mounting groove; the outer peripheral wall of the first inner ring gear is provided with a protrusion, the protrusion extends into the opening to limit the rotation of the first inner ring gear relative to the rotating disc.

[0012] In an embodiment, the small-tooth-difference reduction module further comprises a rotating cooperation structure arranged between the rotating disc and the housing.

[0013] In an embodiment, the rotating cooperation structure comprises a shaft sleeve or a bearing.

[0014] In an embodiment, a first step surface facing away from the motor is formed on the outer side of the rotating disc, and a second step surface facing toward the motor is formed on the inner wall of the housing; the rotating cooperation structure is limited between the first step surface and the second step surface.

[0015] In an embodiment, the sun gear and the planet gear are respectively helical gears.

[0016] The transmission mechanism for the ceiling screen comprises a motor, a display assembly, a planetary gear deceleration module and a small-tooth-difference deceleration module; the planetary gear deceleration module comprises a sun gear, a planet wheel drivenly connected to the sun gear, and a planet carrier connected to the planet wheel; the small-tooth-difference deceleration module comprises a first external gear and a first internal gear ring engaged with the first external gear, the first external gear rotates eccentrically in the first internal gear ring, and the number of teeth of the first external gear is less than the number of teeth of the first internal gear ring; wherein the sun gear is drivenly connected to the motor, the planet carrier is drivenly connected to the first external gear, and the first internal gear ring is drivenly connected to the display assembly; or, the first external gear is drivenly connected to the motor, the first internal gear ring is drivenly connected to the sun gear, and the planet carrier is drivenly connected to the display assembly. The utility model adopts two kinds of combined schemes of the planetary gear deceleration module and the small-tooth-difference deceleration module. In the first combined scheme, the torque of the motor is transmitted to the planet wheel through the sun gear, the planet wheel drives the planet carrier, and the planet carrier is further connected to the external gear in the small-tooth-difference deceleration module, so as to transmit power to the display assembly. In the second combined scheme, the torque of the motor is directly transmitted to the external gear of the small-tooth-difference deceleration module, the first external gear rotates eccentrically in the first internal gear ring, so as to drive the first internal gear ring to rotate; at this time, the first internal gear ring not only serves as a key component of deceleration transmission, but also acts as a bridge of power transmission, and transmits the power after deceleration and torque increase to the sun gear of the planetary gear deceleration module. After receiving the power, the sun gear drives the planet wheel to rotate around it, and the planet wheel further stably transmits the power to the display assembly through the planet carrier. The two combined schemes both transmit the power from the motor to the display assembly, and through the joint action of the planetary gear deceleration module and the small-tooth-difference deceleration module, a significant deceleration ratio is achieved, so that the display assembly can operate at a lower speed, and the torque is correspondingly increased, realizing the overturning, adjustment or other expected actions of the screen. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present utility model, and other drawings can also be obtained according to the structures shown in the drawings without any creative labor for those skilled in the art.

[0018] Figure 1 The overall appearance schematic view of an embodiment of the transmission mechanism for the ceiling screen provided by the present utility model is shown in the figure.

[0019] Figure 2 The sectional view of the transmission mechanism for the ceiling screen in the figure. Figure 1

[0020] The structure schematic view of the transmission shaft in the figure. Figure 3 Figure 1 The structure schematic view of the transmission shaft in the figure.​

[0021] Figure 4 is Figure 2 a perspective exploded schematic view of the second inner ring and the rotating disc in

[0022] Figure 5 is Figure 2 a partial enlarged schematic view of A in

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 1, motor; 11, output shaft; 2, display assembly; 21, frame; 22, connecting shaft; 3, planetary gear reduction module; 31, sun gear; 32, planet gear; 33, planet carrier; 34, gear ring track; 4, small tooth difference reduction module; 40, support bearing; 41, first outer gear; 42, first inner ring; 421, protrusion; 43, second outer gear; 44, second inner ring; 45, transmission shaft; 451, connecting shaft section; 452, eccentric shaft section; 46, rotating disc; 461, mounting groove; 4611, opening; 47, extension shaft; 48, shaft sleeve; 49, connecting sleeve; 5, housing; M1, first step surface; M2, second step surface. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0028] In the prior art, the screen transmission mechanism mainly relies on multi-stage gear transmission and worm gear transmission and other technical means. However, the structure of multi-stage gear transmission and worm gear transmission makes the overall structure large, and the reduction efficiency is not ideal.

[0029] Therefore, the present application provides a transmission mechanism for ceiling screen to realize large reduction ratio and keep the compactness of the overall structure.

[0030] Please refer to Figure 1 and Figure 2 The transmission mechanism provided by the present application comprises a motor 1 (in Figure 2 , only the output shaft 11 and the motor housing of the motor 1 are shown, and the main part of the motor 1 is not shown. However, the motor 1 belongs to the conventional motor type, and those skilled in the art can understand this), a planetary gear reduction module 3, a small tooth difference reduction module 4 and a display assembly 2; wherein the planetary gear reduction module 3 and the small tooth difference reduction module 4 both provide reduction function. The planetary gear reduction module and the small tooth difference reduction module are connected with each other to form an overall structure, which is arranged between the motor 1 and the display assembly 2, so that the torque of the motor 1 can be effectively transmitted to the display assembly 2, and the rotating speed of the display assembly 2 is reduced, which is much lower than the rotating speed of the output shaft of the motor 1. Specifically, the planetary gear reduction module 3 and the small tooth difference reduction module 4 are both installed in the housing 5, and the frame 21 of the display assembly 2 is arranged outside the housing 5.

[0031] Among them, the overall positional relationship of the planetary gear reduction module 3 and the small tooth difference reduction module 4 at least includes the following two kinds: the first kind Figure 2 has been shown), the motor 1, the planetary gear reduction module 3, the small tooth difference reduction module 4 and the display assembly 2 are connected in turn. The second kind (not shown, but those skilled in the art can refer to Figure 2It can be understood that the motor 1, the small tooth difference reduction module 4, the planetary gear reduction module 3 and the display assembly 2 are connected in sequence.

[0032] Please refer to Figure 2 The planetary gear reduction module includes a sun gear 31, a plurality of planet gears 32 and a planet carrier 33. The planet gears 32 are arranged around the sun gear 31 and are respectively engaged with the sun gear 31. The wheel cores of the planet gears 32 are connected with the planet carrier 33, and the wheel core of the sun gear 31 is connected with the output shaft of the motor 1. Through this connection mode, the torque of the output shaft of the motor 1 is transmitted to the planet carrier 33 through the sun gear 31 and the planet gears 32. In order to optimize the rotation of the planet gears 32 around the sun gear 31, the reduction module is also equipped with a ring gear track 34. The planet gears 32 revolve around the sun gear 31 on the ring gear track 34, which not only reduces the rotation speed of the sun gear 31, but also transmits the power after reduction to the planet carrier 33.

[0033] Please refer to Figure 2 The small tooth difference reduction module 4 is a more efficient reduction mechanism, which realizes a larger reduction ratio through the tooth number difference between the outer gear and the inner ring gear. The small tooth difference reduction module 4 can be used as a one-stage reduction module, or can form a multi-stage reduction module. It can be understood that the internal structure of the multi-stage reduction module should include the basic structure of the one-stage reduction module, which means that the small tooth difference reduction module 4 should at least include a pair of first outer gear 41 and first inner ring gear 42 that are engaged with each other. The first outer gear 41 rotates eccentrically in the first inner ring gear 42, and the number of teeth of the first outer gear 41 is less than the number of teeth of the first inner ring gear 42, for example, the number of teeth of the first outer gear 41 is two less than the number of teeth of the first inner ring gear 42, then the first outer gear 41 rotates one circle in the first inner gear, and the first inner ring gear 42 can only rotate an arc of one tooth or several teeth, so that a large reduction ratio can be achieved.

[0034] There are at least two possibilities for the overall positional relationship between the planetary gear reduction module 3 and the small-difference reduction module 4, and therefore at least two sets of specific positional relationships between the components of each module. Specifically, in the first set of positional relationships, the sun gear 31 is connected to the motor 1, the planet carrier 33 is connected to the first outer gear 41, and the first inner ring 42 is connected to the display assembly 2 (it should be noted that if the planet carrier 33 is connected to the first outer gear 41, a transmission assembly, such as a second outer gear 43 and a second inner ring 44, can be added between the planet carrier 33 and the first outer gear 41). In the second set of positional relationships, the first outer gear 41 is connected to the motor 1, the first inner ring 42 is connected to the sun gear 31, and the planet carrier 33 is connected to the display assembly 2. In both sets of positional relationships, the connection between the motor 1, the planetary gear reduction module 3, the small-difference reduction module 4, and the display assembly 2 is different, but both sets of positional relationships achieve a large reduction ratio while maintaining the compactness of the overall structure.

[0035] In the first set of positional relationships (shown in FIG. 1), Figure 2 As shown, the torque of the motor 1 is transmitted to the sun gear 31, then to the planet gear 32, and then to the planet carrier 33. The planet carrier 33, in turn, drives the first outer gear 41 in the small-difference reduction module 4 to rotate eccentrically within the first inner ring 42. Since the first outer gear 41 has fewer teeth than the first inner ring 42, the rotational speed of the first inner ring 42 is greatly reduced, and the torque is correspondingly increased. Finally, the first inner ring 42 transmits the increased torque to the display assembly 2, achieving the flipping or adjusting of the screen.

[0036] In the second set of positional relationships (not shown, but can be understood by those skilled in the art with reference to Figure 2 As shown, the torque of the motor 1 is transmitted to the sun gear 31, then to the planet gear 32, and then to the planet carrier 33. The planet carrier 33, in turn, drives the first outer gear 41 in the small-difference reduction module 4 to rotate eccentrically within the first inner ring 42. Since the first outer gear 41 has fewer teeth than the first inner ring 42, the rotational speed of the first inner ring 42 is greatly reduced, and the torque is correspondingly increased. Finally, the first inner ring 42 transmits the increased torque to the display assembly 2, achieving the flipping or adjusting of the screen.

[0037] Both sets of positional relationships achieve efficient reduction and torque transmission while maintaining the compactness of the overall structure. In addition, since both the planetary gear reduction module 3 and the small-difference reduction module 4 have high transmission efficiency and stability, the transmission mechanism also has good reliability and durability.

[0038] In specific implementation, appropriate scheme can be selected for assembly and adjustment according to actual requirements. For example, appropriate motor 1, planetary gear reduction module 3, small tooth difference reduction module 4 and display assembly 2 and other components can be selected according to the size, weight and flip angle of the screen and other requirements. At the same time, the transmission mechanism can be further optimized and improved to improve its performance and service life.

[0039] The transmission mechanism for the ceiling screen provided by the utility model includes a motor 1, a display assembly 2, a planetary gear reduction module 3 and a small tooth difference reduction module 4. The planetary gear reduction module 3 includes a sun gear 31, a planetary gear 32 drivingly connected to the sun gear 31, and a planetary carrier 33 connected to the planetary gear 32. The small tooth difference reduction module 4 includes a first external gear 41 and a first internal gear ring 42 meshing with the first external gear 41. The first external gear 41 rotates eccentrically in the first internal gear ring 42, and the number of teeth of the first external gear 41 is less than the number of teeth of the first internal gear ring 42. The sun gear 31 is drivingly connected to the motor 1, the planetary carrier 33 is drivingly connected to the first external gear 41, and the first internal gear ring 42 is drivingly connected to the display assembly 2. Alternatively, the first external gear 41 is drivingly connected to the motor 1, the first internal gear ring 42 is drivingly connected to the sun gear 31, and the planetary carrier 33 is drivingly connected to the display assembly 2. The utility model adopts two combined schemes of the planetary gear reduction module 3 and the small tooth difference reduction module 4. In the first combined scheme, the torque of the motor 1 is transmitted to the planetary gear 32 through the sun gear 31, the planetary gear 32 drives the planetary carrier 33, and the planetary carrier 33 is further connected to the first external gear 41 in the small tooth difference reduction module 4, so as to transmit power to the display assembly 2. In the second combined scheme, the torque of the motor 1 is directly transmitted to the external gear of the small tooth difference reduction module 4, which rotates eccentrically in the first internal gear ring 42, thereby driving the first internal gear ring 42 to rotate. At this time, the first internal gear ring 42 not only serves as a key component of speed reduction transmission, but also acts as a bridge for power transmission, transmitting the power with increased torque after speed reduction to the sun gear 31 of the planetary gear reduction module 3. After receiving the power, the sun gear 31 drives the planetary gear 32 to rotate around it, and the planetary gear 32 further stably transmits the power to the display assembly 2 through the planetary carrier 33. Both of the two combined schemes transmit power from the motor 1 to the display assembly 2, and through the joint action of the planetary gear reduction module 3 and the small tooth difference reduction module 4, a significant speed reduction ratio is achieved, so that the display assembly 2 can operate at a lower speed, and the torque is correspondingly increased, realizing the flip, adjustment or other expected actions of the screen.

[0040] In addition, the transmission mechanism provided by the utility model realizes large reduction ratio and maintains compactness of the overall structure through the combination of the planetary gear reduction module 3 and the small-tooth-difference reduction module 4. Meanwhile, the transmission mechanism also has high transmission efficiency and stability, and can meet the high requirements of the automobile on-board screen for the turnover mechanism, thereby providing passengers with more comfortable and convenient viewing experience.

[0041] In some embodiments, referring to Figure 2 , in order to make the overall transmission mechanism more compact and orderly in layout, the motor 1, the planetary gear reduction module 3, the small-tooth-difference reduction module 4 and the display assembly 2 are sequentially arranged along a first direction (the first direction is parallel to the extension direction of the motor output shaft, and is represented by a dashed line a in the figure). Figure 2 In this way, the overall volume is reduced, and installation and layout in the limited on-board space are facilitated. Meanwhile, sequential arrangement along the first direction can also make the power transmission path more explicit and smooth, which is conducive to improving transmission efficiency and stability.

[0042] In some embodiments, referring to Figure 2 , in order to realize larger reduction ratio, the small-tooth-difference reduction module 4 is additionally provided with the second outer gear 43 and the second inner ring gear 42 which are meshed with each other on the basis of the first outer gear 41 and the first inner ring gear 42, that is, the small-tooth-difference reduction module 4 is a two-stage reduction module.

[0043] Specifically, on the basis of the first scheme, the small-tooth-difference reduction module 4 further includes the second outer gear 43 and the second inner ring gear 44 which are meshed with each other. The second outer gear 43 rotates eccentrically in the second inner ring gear 44, and the number of teeth of the second outer gear 43 is less than that of the second inner ring gear 44. In order to make the planet carrier 33 drive connect the first outer gear 41, the second outer gear 43 and the second inner ring gear 44 are arranged between the planet carrier 33 and the first outer gear 41, the second outer gear 43 is fixedly connected with the first outer gear 41, the second inner ring gear 44 is fixed to the inner side of the housing 5, and the second outer gear 43 is connected with the planet carrier 33. Further, in order to make the first inner ring gear 42 rotate normally, the first inner ring gear 42 is arranged in a spaced manner with the inner wall of the housing 5.

[0044] The torque transmission mechanism of the small-tooth-difference reduction module 4 is as follows: first, the torque of the planet carrier 33 is transmitted to the second outer gear 43, and then the torque is transmitted from the second outer gear 43 to the second inner ring gear 44. Since the second inner ring gear 44 is fixedly connected with the housing 5, it will generate a reaction torque which acts on the second outer gear 43 again, resulting in the reduction of the second outer gear 43. The reduced torque of the second outer gear 43 is transmitted to the first outer gear 41, and then to the first inner ring gear 42, so that the rotation speed of the first inner ring gear 42 is further reduced. In short, the small-tooth-difference reduction module 4 realizes two-stage reduction in the torque transmission process.

[0045] The embodiment of the utility model further increases the reduction ratio of the transmission mechanism by increasing the reduction stage number of the small tooth difference reduction module 4. In the first stage reduction, the second external gear 43 rotates eccentrically in the second internal gear ring 44, and due to the tooth number difference, a preliminary reduction effect is achieved. Subsequently, in the case that the second internal gear ring 44 is fixed, the second external gear 43 (which is the second external gear 43 that has been reduced) continues to transmit the torque to the first external gear 41 fixedly connected thereto. In the second stage reduction, the first external gear 41 also rotates eccentrically in the first internal gear ring 42, and the tooth number difference is used again to achieve reduction. Finally, the torque after two-stage reduction is stably transmitted to the display assembly 2 by the first internal gear ring 42.

[0046] The design of the two-stage small tooth difference reduction module 4 not only increases the reduction ratio, so that the display assembly 2 can operate at a lower speed, but also optimizes the torque transmission path, improves the transmission efficiency and stability. In addition, since the entire transmission mechanism is more compact and orderly in layout, installation space can be saved in actual application, and layout and adjustment can be facilitated in limited space such as vehicle.

[0047] In some embodiments, referring to Figure 3 and Figure 2 , in order to stably rotate the first external gear 41 and the second external gear 43, the small tooth difference reduction module 4 further includes a transmission shaft 45. Specifically, the transmission shaft 45 has a connecting shaft section 451 and an eccentric shaft section 452, and the rotation axes of the connecting shaft section 451 and the eccentric shaft section 452 are offset.

[0048] Correspondingly, the second external gear 43 and the first external gear 41 are respectively sleeved on the eccentric shaft section 452 along the extension direction of the eccentric shaft section 452, and the planetary carrier 33 is connected to the connecting shaft section 451. Further, the eccentric shaft section 452 is the middle part of the transmission shaft 45, and the eccentric shaft section 452 is the two end parts of the transmission shaft 45.

[0049] In this way, the second external gear 43 and the first external gear 41 stably rotate on the transmission shaft 45, and at the same time, through the fixed connection of the planetary carrier 33 and the transmission shaft 45, reliable transmission of the torque is achieved. The design of the transmission shaft 45 enables the first external gear 41 and the second external gear 43 to rotate eccentrically in the respective internal gear rings, which is the key to achieving small tooth difference reduction. During rotation, due to the tooth number difference between the external gear and the internal gear ring, the rotation speed of the external gear will gradually decrease, and the torque will correspondingly increase. The effect of reduction and torque increase is further amplified through the continuous action of the two-stage small tooth difference reduction module 4. Finally, the power after sufficient reduction and torque increase is stably transmitted to the display assembly 2 by the first internal gear ring 44, and the screen is flipped, adjusted or other intended actions are achieved.

[0050] In some embodiments, referring to Figure 2 In order to facilitate manufacturing and installation, the outer wall of the eccentric shaft section 452 of the transmission shaft 45 is provided with a connecting sleeve 49. The connecting sleeve 49 can be provided with two, respectively for the installation of the first outer gear 41 and the second outer gear 43. After installation, the transmission shaft 45, the connecting sleeve 49, and the first outer gear 41 and the second outer gear 43 form an integral whole. In this way, the torque of the transmission shaft 45 can be transmitted to the first outer gear 41 and the second outer gear 43. In addition, the end of the transmission shaft 45 is also equipped with a support bearing 40 to provide support for the transmission shaft 45.

[0051] In some embodiments, referring to Figure 3 and Figure 3 In order to more stably transmit the power of the second inner gear ring 44 to the display assembly 2, the small-tooth difference reduction module 4 further includes a turntable 46 and an extension shaft 47. Specifically, the extension shaft 47 is connected to the side of the turntable 46 away from the motor 1; the turntable 46 is vertically arranged, and the side of the turntable 46 facing the motor 1 is provided with a mounting groove 461, and the first inner gear ring 42 is mounted in the mounting groove 461; the extension shaft 47 is connected to the display assembly 2.

[0052] The utility model discloses through the setting of turntable 46 and extension shaft 47, the connection stability between small-tooth difference reduction module 4 and display assembly 2 is enhanced. The turntable 46 is as the bearing component, and the mounting groove 461 on it provides firm support for the first inner gear ring 42, and through interference fit, the firm installation of the first inner gear ring 42 in the mounting groove 461 is ensured. This setting not only improves the reliability of torque transmission, but also effectively prevents the loosening of components due to vibration or impact. At the same time, the extension shaft 47 is as the extension part of power transmission, and it is directly connected to the display assembly 2, so that the power after two-stage reduction and torque increase can be stably and efficiently transmitted to the display assembly 2, thereby driving the screen to flip, adjust or other intended actions.

[0053] In some embodiments, referring to Figure 2 The integrated design of the extension shaft 47 and the turntable 46 can further enhance the overall strength and rigidity of the components and improve the stability and durability of the transmission mechanism. In actual application, this design enables the transmission mechanism to better adapt to complex environments such as vehicle-mounted environments, providing passengers with a more stable and reliable viewing experience.

[0054] In some embodiments, referring to Figure 4 and Figure 2In order to realize the stable connection between the first inner gear ring 42 and the rotating disc 46, the slot wall of the mounting slot 461 is formed with an opening 4611, and the outer peripheral wall of the first inner gear ring 42 is provided with a protrusion 421. Specifically, the opening 4611 communicates the inner side and the outer side of the mounting slot 461, and the protrusion 421 extends into the opening 4611, so that the first inner gear ring 42 is fixed relative to the rotating disc 46.

[0055] The protrusion 421 acts as a connection key for transmitting the torque between the first inner gear ring 42 and the rotating disc 46. The cooperation of the protrusion 421 and the opening 4611 not only ensures the accurate positioning of the first inner gear ring 42 on the rotating disc 46, but also enables the first inner gear ring 42 to be more stably embedded in the mounting slot 461.

[0056] During the cooperation of the mounting slot 461 and the first inner gear ring 42, the mounting slot 461 can tightly cover the first inner gear ring 42 through interference fit. This cooperation not only improves the efficiency of torque transmission, but also effectively reduces noise and wear caused by vibration or impact, prolonging the service life of the transmission mechanism.

[0057] In some embodiments, referring to Figure 2 In order to improve the stability of the rotating disc 46 and make it more stable and reliable during power transmission, the few-tooth difference speed reduction module 4 further comprises a rotating cooperation structure. The rotating cooperation structure is arranged between the rotating disc and the housing, ensuring that the rotating cooperation structure and the housing remain in a relatively fixed state, while the rotating disc can rotate relative to the rotating cooperation structure.

[0058] In some embodiments, the rotating cooperation structure comprises a shaft sleeve 48 or a cooperation bearing (not shown in the figure, the cooperation bearing is consistent with the function of the shaft sleeve 48, and the two can be replaced with each other). These shaft sleeves 48 and cooperation bearings provide support for the rotating disc, ensuring that the rotating disc 46 is stably supported along the radial direction. The rotating cooperation structure can preferably use a bearing, because the cooperation bearing can further reduce the friction between the rotating disc 46 and the cooperation bearing compared to the shaft sleeve 48, improve the transmission efficiency, and at the same time, the cooperation bearing has high precision and carrying capacity, which can better meet the use requirements of the transmission mechanism under complex working conditions such as high speed and heavy load.

[0059] In some embodiments, referring to Figure 5 and Figure 2 In order to limit the movement of the shaft sleeve 48 or the cooperation bearing on the rotating disc 46, a first step surface M1 and a second step surface M2 are provided. Specifically, the first step surface M1 is formed on the outer side of the rotating disc 46 facing away from the motor 1; the second step surface M2 is formed on the inner wall of the housing 5 facing the motor 1, and the rotating cooperation structure is limited between the first step surface M1 and the second step surface M2.

[0060] In this way, the shaft sleeve 48 or the matching bearing is firmly clamped between the first step surface M1 and the second step surface M2, which not only limits the axial movement of the shaft sleeve 48 or the matching bearing, but also ensures that the rotating disc 46 can smoothly rotate. This design not only improves the stability of the transmission mechanism, but also reduces the wear of the components caused by vibration or impact, further prolonging the service life of the transmission mechanism.

[0061] In some embodiments, referring to Figure 2 In order to enhance the stability of the engagement of the sun gear 31 and the planet gears 32 (there are multiple planet gears), the sun gear 31 and the planet gears 32 are respectively helical gears. The specific analysis is as follows: due to the helical shape of the tooth surface of the helical gear, the gear gradually contacts and separates during engagement, which is more smooth than the instantaneous engagement of the spur gear, reduces impact and vibration, and thus improves the stability of the transmission. At the same time, the helix angle design of the helical gear can also increase the contact area of the tooth surface and improve the load carrying capacity of the gear, so that the transmission mechanism can withstand greater torque and load.

[0062] In the transmission of the sun gear 31 and the planet gears 32 using helical gears, due to the engagement characteristics of the helical gears, a certain axial force balance can also be achieved. In the planetary gear reduction module 3, the sun gear 31 acts as the driving gear, and when its torque is transmitted to the planet gears 32, a certain axial force is generated. The planet gears 32 act as driven gears, and the axial force acting on them is in the opposite direction. Due to the helix angle design of the helical gear, these axial forces can to some extent cancel each other out, thereby reducing the axial force acting on the transmission mechanism and improving the overall stability and durability.

[0063] In some embodiments, referring to ​ In order to facilitate the installation of the display screen and the rotation of the display assembly 2, the display assembly 2 is designed as a frame 21 and a connecting shaft 22 structure. The frame 21 is used to install the display screen; the connecting shaft 22 is arranged at the edge of the frame 21, and the connecting shaft 22 is connected to the first inner ring gear 42.

[0064] The frame 21 and the connecting shaft 22 structure design of the embodiments of the present application enables the display screen to be firmly installed on the frame 21. At the same time, the connecting shaft 22, as a key component for power transmission, is connected to the first inner ring gear 42, achieving effective power transmission from the few-tooth difference reduction module 4 to the display assembly 2.

[0065] The above-described embodiments are merely exemplary embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made by referring to the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A transmission mechanism for a ceiling screen, characterized by, The motor and the display assembly are connected in series along a first direction. The motor, the planetary gear reduction module, the small-tooth-difference reduction module and the display assembly are connected in series along a first direction. The small-tooth-difference reduction module further comprises a second outer gear and a second inner gear ring engaged with the second outer gear, the second outer gear and the second inner gear ring are arranged between the first inner gear ring and the planet carrier; the second outer gear is fixedly connected to the first outer gear, the second inner gear ring is fixed to the inner side of the housing, and the second outer gear is connected to the planet carrier. The second outer gear is eccentrically rotated in the second inner gear ring, and the number of teeth of the second outer gear is less than the number of teeth of the second inner gear ring. The small-tooth-difference reduction module further comprises a transmission shaft having a connecting shaft segment and an eccentric shaft segment, and the rotation axes of the connecting shaft segment and the eccentric shaft segment are offset. The first outer gear and the second outer gear are respectively sleeved on the eccentric shaft segment along the extension direction of the eccentric shaft segment; and the planet carrier is connected to the connecting shaft segment. The small-tooth-difference reduction module further comprises:

2. The transmission mechanism for a ceiling screen according to claim 1, wherein A rotating disc arranged vertically, the rotating disc is provided with a mounting groove on the side facing the motor; and 3. A transmission mechanism for a ceiling screen according to claim 1 or 2, characterized in that, An extension shaft connected to the side of the rotating disc away from the motor. The first inner gear ring is rotationally mounted in the mounting groove, and the extension shaft is connected to the display assembly.

4. The transmission mechanism for a ceiling screen according to claim 3, wherein An opening is formed in the groove wall of the mounting groove, the opening communicates the inner side and the outer side of the mounting groove; a protrusion is arranged on the outer peripheral wall side of the first inner gear ring, the protrusion extends into the opening to limit the rotation of the first inner gear ring relative to the rotating disc. The small-tooth-difference reduction module further comprises a rotating cooperation structure arranged between the rotating disc and the housing.

5. The transmission mechanism for a ceiling screen according to claim 3, wherein The rotating cooperation structure comprises a shaft sleeve or a bearing. A first step surface facing away from the motor is formed on the outer side of the rotating disc, and a second step surface facing toward the motor is formed on the inner wall of the housing; The rotating cooperation structure is limited between the first step surface and the second step surface. The sun gear and the planet gear are respectively helical gears.

6. The transmission mechanism for a ceiling screen according to claim 5, wherein ​ 7. The transmission mechanism for a ceiling screen according to claim 5, wherein ​ 8. The transmission mechanism for a ceiling screen according to claim 7, wherein ​ 9. The transmission mechanism for a ceiling screen according to claim 7, wherein ​ ​ 10. The transmission mechanism for a ceiling screen according to claim 1, wherein ​

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