Large-transmission-ratio differential gear box with self-locking function

Abstract

The invention relates to the technical field of automobiles and robots, and discloses a large-transmission-ratio differential gear box with a self-locking function, the large-transmission-ratio differential gear box with the self-locking function comprises a supporting system, a planetary gear assembly, a fluted disc assembly and a sun gear, and the supporting system comprises a large bearing, a small bearing, an upper supporting disc, a lower supporting disc, a shell, a screw and a shaft. According to the large-transmission-ratio differential gear box with the self-locking function, large-transmission-ratio transmission is achieved through unique differential gear structural design and cooperation of gears with different tooth numbers, input high-speed small-torque motion can be efficiently converted into output low-speed large-torque motion, the requirement of equipment for high-precision adjustment is met, and the large-transmission-ratio differential gear box with the self-locking function is suitable for popularization and application. And precise adjustment of a micro angle or displacement is realized. Meanwhile, by means of the meshing relation between the gears, a specific positioning device and the action of friction force, the gear box has a reliable self-locking function, accidental rotation can be effectively prevented when no power is input, and safe and stable operation of equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical fields of automobiles and robots, and particularly to a differential gearbox with a large transmission ratio and a self-locking function. Background Art

[0002] The gearbox for seat adjustment is a key component to realize functions such as seat position and angle adjustment. In automobiles, it is used to adjust the position, height, backrest angle, headrest height, etc. of the driver's and passengers' seats to provide a comfortable driving and riding experience. It can also be applied to the seat massage function of some high-end automobiles, providing comfortable massage services for passengers by precisely controlling the actions of the massage mechanism.

[0003] Deficiencies of traditional gearboxes in seat adjustment:

[0004] a. In the field of automobile seat adjustment, traditional gearboxes usually only have simple transmission functions and are difficult to achieve high-precision position adjustment. Their limited transmission ratio cannot meet the requirements of the seat for different adjustment speeds and forces, resulting in a less delicate adjustment process and unable to accurately match the body types and usage habits of various users.

[0005] b. Safety hazards caused by the lack of self-locking function: Most existing automobile seat adjustment systems lack a reliable self-locking function. When the vehicle encounters bumps, sudden brakes, or collisions during driving, the seat may move unexpectedly due to external forces, which not only affects the comfort of passengers but also seriously threatens the safety of passengers.

[0006] c. Impact on the overall performance of automobiles: Traditional gearboxes are large in volume, heavy in weight, and low in transmission efficiency, which not only increases the overall weight of the automobile but also causes energy waste. With the increasing requirements of the automobile industry for energy conservation, emission reduction, and space optimization, traditional gearboxes are difficult to meet the development needs of modern automobiles. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention provides a differential gearbox with a large transmission ratio and a self-locking function. This structure can achieve a large transmission ratio, convert the small rotation of the power source into fine movements for seat adjustment, making the adjustment of seats, table boards, leg rests, etc. more precise, meeting the personalized needs of different users, and improving riding comfort. Moreover, it can automatically achieve self-locking, effectively preventing the seat from moving unexpectedly due to bumps, vibrations, etc. during vehicle driving, providing reliable safety protection for passengers. This differential gear structure is relatively compact, occupies less space inside the seat, is conducive to the overall design and layout optimization of the seat, makes the seat thinner, more beautiful, and at the same time leaves more space for other functional components.

[0008] The present invention provides the following technical solution: A differential gearbox with a large transmission ratio and a self-locking function, comprising a support system, a planetary gear assembly, a tooth disc assembly, and a sun gear. The support system includes a large bearing, a small bearing, an upper support disc, a lower support disc, a housing, screws, and a shaft;

[0009] The planetary gear assembly includes three planetary gears and three shafts respectively installed on the planetary gears. The three planetary gears are the first planetary gear, the second planetary gear, and the third planetary gear respectively, and the sun gear meshes with the three planetary gears;

[0010] The tooth disc assembly includes an upper tooth disc and a lower tooth disc. The upper tooth disc meshes with the three planetary gears, and the lower tooth disc meshes with the three planetary gears.

[0011] The upper support disc is installed inside the upper tooth disc, the lower support disc is installed inside the lower tooth disc. The outer surface of the upper support disc is provided with three uniformly distributed small holes of the upper support disc, and the center of the upper support disc is provided with a central hole of the upper support disc. The sun gear is rotatably installed in the central hole of the upper support disc. The outer surface of the lower support disc is provided with three uniformly distributed small holes of the lower support disc. One end of the three shafts is installed in the small holes of the upper support disc, and the other end is installed in the small holes of the lower support disc. A protrusion of the lower support disc is provided at the center of the lower support disc, and a threaded hole is provided on the outer surface of the protrusion of the lower support disc. The threaded hole cooperates with the screw, and the small bearing is installed at the protrusion of the lower support disc through the screw.

[0012] Preferably, the first planetary gear includes an upper part of the first planetary gear, a lower part of the first planetary gear, and the center of the first planetary gear. The upper part of the first planetary gear meshes with the upper tooth disc, and the lower part of the first planetary gear meshes with the lower tooth disc;

[0013] The second planetary gear includes an upper part of the second planetary gear, a lower part of the second planetary gear, and the center of the second planetary gear. The upper part of the second planetary gear meshes with the upper tooth disc, and the lower part of the second planetary gear meshes with the lower tooth disc;

[0014] The third planetary gear includes an upper part of the third planetary gear, a lower part of the third planetary gear, and the center of the third planetary gear. The upper part of the third planetary gear meshes with the upper tooth disc, and the lower part of the third planetary gear meshes with the lower tooth disc.

[0015] Preferably, the upper parts of the first planetary gear, the second planetary gear, and the third planetary gear are all twelve-tooth;

[0016] The lower parts of the first planetary gear, the second planetary gear, and the third planetary gear are all eleven-tooth.

[0017] Preferably, the inner wall of the upper gear disc is provided with upper gear disc teeth, and one side of the upper gear disc is provided with a plurality of uniformly distributed upper gear disc holes, namely the first upper gear disc hole, the second upper gear disc hole, the third upper gear disc hole, the fourth upper gear disc hole, the fifth upper gear disc hole, the sixth upper gear disc hole, the seventh upper gear disc hole and the eighth upper gear disc hole;

[0018] A groove is provided at the axis center of the upper gear disc, a through hole is provided at the center of the groove of the upper gear disc, and the other side of the upper gear disc is provided with four uniformly distributed upper gear disc holes, namely the ninth upper gear disc hole, the tenth upper gear disc hole, the eleventh upper gear disc hole and the twelfth upper gear disc hole.

[0019] Preferably, the outer surface of the housing is provided with four uniformly distributed protrusions, namely the first housing protrusion, the second housing protrusion, the third housing protrusion and the fourth housing protrusion. The outer surface of the housing is provided with four uniformly distributed housing holes, and the housing holes and the protrusions are arranged at intervals. The housing holes are respectively the first housing hole, the second housing hole, the third housing hole and the fourth housing hole;

[0020] The inner wall of the housing is provided with an annular protrusion, and an annular groove is formed between the annular protrusion and the housing. The lower bearing is adapted to the annular groove.

[0021] Preferably, the lower gear disc is in a stepped shape and includes a large-diameter layer and a small-diameter layer. The outer surface of the small-diameter layer is provided with four uniformly distributed lower gear disc holes, namely the first lower gear disc hole, the second lower gear disc hole, the third lower gear disc hole and the fourth lower gear disc hole. A through hole is provided at the axis center of the small-diameter layer, and a circular lower gear disc protrusion is fixedly installed on the inner wall of the through hole of the lower gear disc. A plurality of teeth are provided on the inner wall of the large-diameter layer, and a lower gear disc partition is installed on the inner wall of the large-diameter layer. The lower gear disc partition is communicated with the through hole of the lower gear disc.

[0022] Preferably, the through hole of the upper gear disc is the input end, and the through hole of the upper gear disc corresponds to the sun gear.

[0023] Preferably, the housing fits with the lower gear disc, the housing is sleeved on the outside of the lower gear disc, and the through hole of the lower gear disc is the output end.

[0024] Preferably, the number of the upper gear disc teeth of the upper gear disc is thirty-five, and the number of the teeth of the lower gear disc is thirty-four.

[0025] Preferably, the outer surface of the sun gear is provided with sun gear teeth, the number of the sun gear teeth is ten, and a through hole is provided at the axis center of the sun gear.

[0026] Compared with the prior art, the present invention provides a differential gearbox with a large transmission ratio and a self-locking function, and has the following beneficial effects:

[0027] (1) The large transmission ratio differential gearbox with self-locking function realizes a large transmission ratio through a unique gear structure, meeting the diverse adjustment requirements of speed and torque for equipment such as car seats, improving the adjustment accuracy and flexibility. At the same time, a reliable self-locking system is incorporated to ensure stable locking of the equipment under various working conditions, especially ensuring the safety of car seats during driving, providing an efficient solution for related industries.

[0028] (2) The large transmission ratio differential gearbox with self-locking function, through the unique design of the differential gear structure, utilizes the cooperation of gears with different numbers of teeth to achieve large transmission ratio transmission. It can efficiently convert the input high-speed small torque motion into the output low-speed large torque motion, meeting the equipment's demand for high-precision adjustment and achieving precise adjustment of tiny angles or displacements. At the same time, relying on the meshing relationship between gears, specific positioning devices, and the action of friction, the gearbox has a reliable self-locking function, effectively preventing accidental rotation when there is no power input and ensuring the safe and stable operation of the equipment. In addition, the reasonable structural layout makes the gearbox structure compact, reduces the number of parts, lowers the assembly difficulty and cost, and also saves installation space, facilitating the miniaturization and integrated design of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the present invention;

[0030] Figure 2 is of the present invention Figure 1 rear view structural schematic diagram;

[0031] Figure 3 is an exploded structural schematic diagram of the present invention;

[0032] Figure 4 is a schematic structural diagram of the housing of the present invention;

[0033] Figure 5 is of the present invention Figure 4 rear view structural schematic diagram;

[0034] Figure 6 is a schematic structural diagram of the upper gear disc of the present invention;

[0035] Figure 7 is of the present invention Figure 6 rear view structural schematic diagram;

[0036] Figure 8 is a schematic structural diagram of the lower gear disc of the present invention;

[0037] Figure 9 is of the present invention Figure 8 rear view structural schematic diagram;

[0038] Figure 10Schematic structural diagram of the assembled state of the gear assembly of the present invention;

[0039] Figure 11 of the present invention Figure 10 rear view structural diagram;

[0040] Figure 12 Schematic structural diagram of the first planetary gear of the present invention;

[0041] Figure 13 Schematic structural diagram of the second planetary gear of the present invention;

[0042] Figure 14 Schematic structural diagram of the third planetary gear of the present invention;

[0043] Figure 15 Schematic structural diagram of the meshing state of the sun gear and the planetary gears of the present invention;

[0044] Figure 16 Schematic structural diagram of the sun gear of the present invention;

[0045] Figure 17 Schematic structural diagram of the lower support disk of the present invention;

[0046] Figure 18 Schematic structural diagram of the upper support disk of the present invention.

[0047] In the figure: 100, large bearing; 200, housing; 300, lower gear disk; 400, screw; 500, small bearing; 600, lower support disk; 700, shaft; 800, first planetary gear; 900, second planetary gear; 1000, third planetary gear; 1100, sun gear; 12, upper support disk; 1300, upper gear disk;

[0048] 201, first housing protrusion; 202, second housing protrusion; 203, third housing protrusion; 204, fourth housing protrusion; 205, first housing hole; 206, second housing hole; 207, third housing hole; 208, fourth housing hole; 209, annular protrusion; 210, annular groove;

[0049] 301, first lower gear disk hole; 302, second lower gear disk hole; 303, third lower gear disk hole; 304, fourth lower gear disk hole; 305, small diameter layer; 306, large diameter layer; 307, tooth; 308, lower gear disk partition; 310, lower gear disk through hole;

[0050] 601, small hole of lower support disk; 602, threaded hole; 603, lower support disk protrusion;

[0051] 801, upper part of the first planetary gear; 802, lower part of the first planetary gear; 803, at the axis center of the first planetary gear;

[0052] 901. Upper part of the second planetary gear; 902. Lower part of the second planetary gear; 903. Axis position of the second planetary gear;

[0053] 1010. Upper part of the third planetary gear; 1020. Lower part of the third planetary gear; 1030. Axis position of the third planetary gear;

[0054] 1110. Teeth of the sun gear; 1120. Through hole of the sun gear;

[0055] 1210. Axis hole of the upper support disk; 1220. Small hole of the upper support disk;

[0056] 1301. Teeth of the upper gear disk; 1302. First hole of the upper gear disk; 1303. Second hole of the upper gear disk; 1304. Third hole of the upper gear disk; 1305. Fourth hole of the upper gear disk; 1306. Fifth hole of the upper gear disk; 1307. Groove of the upper gear disk; 1308. Sixth hole of the upper gear disk; 1309. Seventh hole of the upper gear disk; 1310. Eighth hole of the upper gear disk; 1311. Ninth hole of the upper gear disk; 1312. Tenth hole of the upper gear disk; 1313. Eleventh hole of the upper gear disk; 1314. Eleventh hole of the upper gear disk; 1315. Through hole of the upper gear disk. Detailed implementation mode

[0057] Please refer to Figure 1-18 , a differential gearbox with a large transmission ratio and self-locking function, including a support system, a planetary gear assembly, a gear disk assembly and a sun gear 1100. The support system includes a large bearing 100, a small bearing 500, an upper support disk 1200, a lower support disk 600, a housing 200, a screw 400 and a shaft 700;

[0058] The large bearing 100 and the small bearing 500 mainly bear the support and reduce the friction and wear during the rotation process to ensure the smoothness of the transmission. The reasonable configuration of the large and small bearings jointly maintains the accurate position and running accuracy of each rotating component in the gearbox, reduces the energy loss caused by friction and vibration, and improves the transmission efficiency.

[0059] The planetary gear assembly includes three planetary gears and three shafts 700 respectively installed on the planetary gears. The three planetary gears are the first planetary gear 800, the second planetary gear 900 and the third planetary gear 1000, and the sun gear 1100 meshes with the three planetary gears;

[0060] The gear disk assembly includes an upper gear disk 1300 and a lower gear disk 300. The upper gear disk 1300 meshes with the three planetary gears, and the lower gear disk 300 meshes with the three planetary gears. The gear disk assembly and the planetary gear assembly cooperate with each other to achieve the transmission and conversion of power. The meshing of the gear disks with different numbers of teeth and the planetary gears causes the planetary gears to generate differential motion during the revolution and rotation processes, thereby converting the high-speed and small-torque input of the sun gear 1100 into a low-speed and large-torque output to achieve the adjustment of the large transmission ratio.

[0061] The upper support disk 1200 is installed inside the upper gear disk 1300, and the lower support disk 600 is installed inside the lower gear disk 300. Three evenly distributed small holes 1220 are provided on the outer surface of the upper support disk 1200, and an upper support disk axial hole 1210 is provided at the axis center of the upper support disk 1200. The sun gear 1100 is rotatably installed inside the upper support disk axial hole 1210. Three evenly distributed small holes 601 are provided on the outer surface of the lower support disk 600. One end of the three shafts 700 is installed inside the small holes 1220 of the upper support disk, and the other end is installed inside the small holes 601 of the lower support disk. These hole positions form a tight fit with the shafts 700, which can support and position the planetary gears, ensuring the stability of the planetary gears during movement.

[0062] A lower support disk protrusion 603 is provided at the axis center of the lower support disk 600. A threaded hole 602 is provided on the outer surface of the lower support disk protrusion 603. The threaded hole 602 cooperates with the screw 400, and the small bearing 500 is installed at the lower support disk protrusion 603 through the screw 400.

[0063] Embodiment 2: The difference between this embodiment and Embodiment 1 is that, among them, the first planetary gear 800 includes a first planetary gear upper part 801, a first planetary gear lower part 802, and a first planetary gear axis center 803. The first planetary gear upper part 801 meshes with the upper gear disk 1300, and the first planetary gear lower part 802 meshes with the lower gear disk 300;

[0064] The second planetary gear 900 includes a second planetary gear upper part 901, a second planetary gear lower part 902, and a second planetary gear axis center 903. The second planetary gear upper part 901 meshes with the upper gear disk 1300, and the second planetary gear lower part 902 meshes with the lower gear disk 300;

[0065] The third planetary gear 1000 includes a third planetary gear upper part 1010, a third planetary gear lower part 1020, and a third planetary gear axis center 1030. The third planetary gear upper part 1010 meshes with the upper gear disk 1300, and the third planetary gear lower part 1020 meshes with the lower gear disk 300.

[0066] Embodiment 3: The difference between this embodiment and Embodiment 1 is that, among them, the first planetary gear upper part 801, the second planetary gear upper part 901, and the third planetary gear upper part 1010 are all twelve-tooth;

[0067] The first planetary gear lower part 802, the second planetary gear lower part 902, and the third planetary gear lower part 1020 are all eleven-tooth.

[0068] The first planetary gear 800, the second planetary gear 900, the third planetary gear 1000, and the three shafts 700 installed on the planetary gears form a planetary gear assembly;

[0069] The angles of the teeth of the three planetary gears are different to facilitate more complex differential transmission, improve the uniformity of load distribution, and reduce transmission noise and vibration. The structure of the planetary gear is designed with two types of tooth profiles, upper and lower. For example, the upper part of the teeth of the first planetary gear 800 is the upper part of the first planetary gear 801, with 12 teeth, which meshes with the upper tooth disc 1300 with 35 teeth. The lower part of the teeth is the lower part of the first planetary gear 802, with 11 teeth, which meshes with the lower tooth disc 300 with 34 teeth.

[0070] These three planetary gears are respectively fixed between the upper support disc 1200 and the lower support disc 600 through three shafts 700. The three hole positions of the upper support disc 1200 and the lower support disc 600 are evenly distributed, with an included angle of 120°. The sun gear 1100 meshes with the three planetary gears. When the sun gear 1100 rotates, it drives the planetary gears to rotate. Due to the different number of teeth and tooth angles of the upper and lower parts of the planetary gears, and their meshing with tooth discs with different numbers of teeth, differential transmission is achieved, achieving the adjustment effect of a large transmission ratio. When the sun gear 1100 rotates clockwise, it will drive the first planetary gear 800, the second planetary gear 900, and the third planetary gear 1000 that mesh with it to start moving. The three planetary gears are respectively fixed between the upper support disc 1200 and the lower support disc 600 through three shafts 700, so they will first make a clockwise revolution around the sun gear 1100. During the revolution, the planetary gears will also rotate on their own. This is mainly due to their unique structural design and meshing relationship with different tooth discs. The number of teeth in the upper and lower parts is different, and when cooperating with tooth discs with different numbers of teeth, the constraints received are also different. The lower tooth disc 300 has fewer teeth and the lower part of the planetary gear also has fewer teeth, while the upper tooth disc 1300 has more teeth and the upper part of the planetary gear has more teeth. This makes the rotation trends of the upper and lower parts different when following the revolution. And due to the different tooth angles changing the direction and transmission mode of the force, this rotation difference is further aggravated.

[0071] Embodiment 4: The difference between this embodiment and Embodiment 1 is that the inner wall of the upper tooth disc 1300 is provided with upper tooth disc teeth 1301. One side of the upper tooth disc 1300 is provided with a plurality of evenly distributed upper tooth disc holes, namely the first upper tooth disc hole 1302, the second upper tooth disc hole 1303, the third upper tooth disc hole 1304, the fourth upper tooth disc hole 1305, the fifth upper tooth disc hole 1306, the sixth upper tooth disc hole 1308, the seventh upper tooth disc hole 1309, and the eighth upper tooth disc hole 1310;

[0072] At the center of the axis of the upper tooth disc 1300, there is an upper tooth disc groove 1307. At the center of the circle of the upper tooth disc groove 1307, there is an upper tooth disc through hole 1315. The other side of the upper tooth disc 1300 is provided with four evenly distributed upper tooth disc holes, namely the ninth upper tooth disc hole 1311, the tenth upper tooth disc hole 1312, the eleventh upper tooth disc hole 1313, and the twelfth upper tooth disc hole 1314;

[0073] The number of the upper sprocket teeth 1301 of the upper sprocket 1300 is thirty-five.

[0074] Embodiment 5: The difference between this embodiment and Embodiment 1 is that four evenly distributed protrusions are provided on the outer surface of the housing 200, namely the first housing protrusion 201, the second housing protrusion 202, the third housing protrusion 203, and the fourth housing protrusion 204. Four evenly distributed housing holes are provided on the outer surface of the housing 200, and the housing holes and the protrusions are arranged at intervals. The housing holes are respectively the first housing hole 205, the second housing hole 206, the third housing hole 207, and the fourth housing hole 208;

[0075] An annular protrusion 209 is provided on the inner wall of the housing 200, and an annular groove 210 is formed between the annular protrusion 209 and the housing 200. The lower bearing 100 is adapted to the annular groove 210.

[0076] The housing 200 plays a role in protection and support, and also helps with the overall layout and installation of the system.

[0077] Embodiment 6: The difference between this embodiment and Embodiment 1 is that the lower sprocket 300 is stepped, including a large-diameter layer 306 and a small-diameter layer 305. Four evenly distributed lower sprocket holes are provided on the outer surface of the small-diameter layer 305. The lower sprocket holes are respectively the first lower sprocket hole 301, the second lower sprocket hole 302, the third lower sprocket hole 303, and the fourth lower sprocket hole 304. A lower sprocket through-hole 310 is provided at the center of the small-diameter layer 305. A circular lower sprocket protrusion 309 is fixedly installed on the inner wall of the lower sprocket through-hole 310. A plurality of teeth 307 are provided on the inner wall of the large-diameter layer 306. A lower sprocket partition 308 is installed on the inner wall of the large-diameter layer 306. The lower sprocket partition 308 communicates with the lower sprocket through-hole 310;

[0078] The number of the teeth 307 of the lower sprocket 300 is thirty-four.

[0079] Embodiment 6: The difference between this embodiment and Embodiment 1 is that the upper sprocket through-hole 1315 is the input end, the upper sprocket through-hole 1315 corresponds to the sun gear 1100, the housing 200 fits with the lower sprocket 300, the housing 200 is sleeved on the outside of the lower sprocket 300, and the lower sprocket through-hole 310 is the output end.

[0080] Input end. The input end has an interface adapted to the motor coupling shaft to transmit the rotational power of the motor to the sun gear 1100, thereby starting the operation of the differential tooth adjustment system;

[0081] Output end. The output end uses the lower sprocket through-hole 310 of the lower sprocket 300 to connect to an external execution component, output the adjusted power in the gearbox to an external device, and drive the external device to complete corresponding work.

[0082] Embodiment 7: The difference between this embodiment and Embodiment 1 is that the outer surface of the sun gear 1100 is provided with sun gear teeth 1110, the number of sun gear teeth 1110 is ten, and a sun gear through hole 1120 is provided at the axis of the sun gear 1100.

[0083] When the planet gear revolves around the sun gear 1100, the upper tooth disc 1300 and the lower tooth disc 300 will exert different reaction forces on the upper and lower parts of the planet gear. Due to the differences in the number of teeth, tooth angles, and the number of teeth of the meshing tooth discs of the upper and lower parts, the rotation speeds and directions of the upper and lower parts of the planet gear are different. This rotation difference is superimposed on the revolution motion to form a differential drive. The upper part of the planet gear rotates slower, while the lower part rotates faster. This difference in speed and direction makes the motion of the entire planet gear assembly complex, and finally achieves the adjustment effect of a large transmission ratio, converting the high-speed rotation of the sun gear into the low-speed rotation of the upper and lower tooth discs to meet the power output requirements of different devices.

[0084] The sun gear 1100 is located at the center of the entire system and serves as the starting point of power input. The sun gear 1100 has 10 teeth and is surrounded by three different planet gears, which are respectively connected by three shafts 700 to form a planet carrier. Power is input from an external motor to the sun gear 1100, and the sun gear 1100 drives the planet gears to revolve and rotate. This unique tooth number configuration and transmission method can achieve large transmission ratio adjustment to meet the requirements of different adjustment speeds and forces of the seat. When the sun gear 1100 works, it drives the meshing planet gear 1, planet gear 2, and planet gear 3 as a power source. Since the lower part of the planet gear meshes with the lower tooth disc 300 with 34 teeth, and the upper part of the planet gear meshes with the upper tooth disc 1300 with 35 teeth, this difference causes the planet gear to rotate while revolving around the sun gear 1100, thus forming a differential motion. Under this differential motion, large transmission ratio adjustment can be achieved, converting the rotation of the sun gear 1100 into the rotation of the upper and lower tooth discs at different speeds, and then realizing the adjustment of automotive seats, leg rests, table boards, etc. This adjustment function can convert the input high-speed small torque into low-speed large torque output, meet the diverse requirements of different external devices for power output speed and torque, and achieve precise control of the motion speed and position of external devices.

[0085] Transmission adjustment principle

[0086] When adjusting the gearbox drive, the rotational power of the external motor is transmitted through the input adaptor interface of the through-hole 1315 of the upper gear disc to the sun gear 1100, causing it to rotate clockwise. The sun gear meshes with the first planet gear 800, the second planet gear 900, and the third planet gear 1000, driving them to revolve around the sun gear in a clockwise direction. The planet gears are fixed between the upper support disc 1200 and the lower support disc 600 by three shafts 700 to ensure stable revolution. Since the upper 12 teeth of the planet gear mesh with the upper gear disc 1300 with 35 teeth and the lower 11 teeth mesh with the lower gear disc 300 with 34 teeth, and the tooth angles of the three planet gears are different, the upper and lower parts generate self-rotation when revolving due to the different reaction forces from the upper and lower gear discs. Usually, the lower part has fewer teeth and the corresponding lower gear disc also has fewer teeth, resulting in a different self-rotation speed and direction from the upper part. This difference in self-rotation between the upper and lower parts is superimposed on the revolution to form differential drive. The slower self-rotation of the upper part and the faster self-rotation of the lower part will cause the upper and lower gear discs to move at different speeds and in different directions, achieving large transmission ratio adjustment, and converting the high-speed rotation of the sun gear into the low-speed rotation of the upper and lower gear discs to meet the power output requirements of different devices. This drive system can achieve a transmission ratio of approximately 1:80, converting the high-speed small-torque input of the motor into the low-speed large-torque output required for seat adjustment.

[0087] During the seat adjustment process, by controlling the forward and reverse rotation and speed of the drive motor, the adjustment of the seat in the vertical, front-back, and other directions can be precisely controlled. When adjusting the front-back position of the seat, the drive motor drives the sun gear 1100 to rotate, and the power is transmitted to the front-back adjustment mechanism of the seat through the drive system to achieve the front-back movement of the seat; when adjusting the backrest angle, similarly, by controlling the movement of the motor, the drive system transmits the power to the backrest adjustment mechanism to achieve precise adjustment of the backrest angle.

[0088] Self-locking function

[0089] Since the upper and lower parts of the planet gear mesh with the upper and lower gear discs with different numbers of teeth, the upper 12 teeth cooperate with the upper gear disc 1300 with 35 teeth, and the lower 11 teeth cooperate with the lower gear disc 300 with 34 teeth. When the external power stops driving the sun gear 1100, due to the existence of this tooth number difference, the reverse reaction forces exerted by the upper and lower gear discs on the planet gear will restrict each other. Without sufficient external force to overcome the resistance caused by the tooth number difference, the planet gear cannot rotate easily, thereby restricting the movement of the entire differential adjustment system and forming a certain degree of self-locking. In the absence of power input, even if affected by external vibrations or other external forces, it can prevent the seat adjustment mechanism from moving on its own and ensure the stable position of the seat.

[0090] In summary, the differential gearbox with self-locking function achieves high reduction ratio transmission through a unique differential gear structure design, by means of the cooperation of gears with different numbers of teeth, which can efficiently convert the input high-speed and low-torque motion into the output low-speed and high-torque motion, meeting the equipment's demand for high-precision adjustment and realizing precise adjustment of small angles or displacements. At the same time, relying on the meshing relationship between gears, specific positioning devices and the action of friction, the gearbox has a reliable self-locking function, which can effectively prevent accidental rotation when there is no power input, ensuring the safe and stable operation of the equipment. In addition, the reasonable structural layout makes the gearbox compact, reduces the number of components, lowers the assembly difficulty and cost, saves the installation space, and is conducive to the miniaturization and integration design of the equipment.

Claims

1. A differential gearbox with a large transmission ratio and a self-locking function, comprising a support system, a planetary gear assembly, a gear disc assembly, and a sun gear (1100), characterized in that: The support system includes a large bearing (100), a small bearing (500), an upper support disk (1200), a lower support disk (600), a housing (200), a screw (400), and a shaft (700); The planetary gear assembly includes three planetary gears and three shafts (700) respectively installed on the planetary gears. The three planetary gears are the first planetary gear (800), the second planetary gear (900), and the third planetary gear (1000). The sun gear (1100) meshes with the three planetary gears; The gear disk assembly includes an upper gear disk (1300) and a lower gear disk (300). The upper gear disk (1300) meshes with the three planetary gears, and the lower gear disk (300) meshes with the three planetary gears. The upper support disk (1200) is installed inside the upper gear disk (1300), and the lower support disk (600) is installed inside the lower gear disk (300). Three evenly distributed small holes (1220) are provided on the outer surface of the upper support disk (1200). An upper support disk central hole (1210) is provided at the center of the upper support disk (1200). The sun gear (1100) is rotatably installed inside the upper support disk central hole (1210). Three evenly distributed small holes (601) are provided on the outer surface of the lower support disk (600). One end of the three shafts (700) is installed inside the small holes (1220) of the upper support disk, and the other end is installed inside the small holes (601) of the lower support disk. A lower support disk protrusion (603) is provided at the center of the lower support disk (600). A threaded hole (602) is provided on the outer surface of the lower support disk protrusion (603). The threaded hole (602) cooperates with the screw (400). The small bearing (500) is installed at the lower support disk protrusion (603) through the screw (400).

2. A large transmission ratio differential gearbox with a self-locking function according to claim 1, characterized in that: The first planetary gear (800) includes a first planetary gear upper part (801), a first planetary gear lower part (802), and a first planetary gear central part (803). The first planetary gear upper part (801) meshes with the upper gear disk (1300), and the first planetary gear lower part (802) meshes with the lower gear disk (300); The second planetary gear (900) includes a second planetary gear upper part (901), a second planetary gear lower part (902), and a second planetary gear central part (903). The second planetary gear upper part (901) meshes with the upper gear disk (1300), and the second planetary gear lower part (902) meshes with the lower gear disk (300); The third planetary gear (1000) includes a third planetary gear upper part (1010), a third planetary gear lower part (1020), and a third planetary gear central part (1030). The third planetary gear upper part (1010) meshes with the upper gear disk (1300), and the third planetary gear lower part (1020) meshes with the lower gear disk (300).

3. A large transmission ratio differential gearbox with a self-locking function according to claim 2, characterized in that: The first planetary gear upper part (801), the second planetary gear upper part (901), and the third planetary gear upper part (1010) all have twelve teeth; The lower part of the first planetary gear (802), the lower part of the second planetary gear (902), and the lower part of the third planetary gear (1020) all have eleven teeth.

4. A large transmission ratio differential gearbox with a self-locking function according to claim 3, characterized in that: The inner wall of the upper tooth disc (1300) is provided with upper tooth disc teeth (1301). One side of the upper tooth disc (1300) is provided with a plurality of uniformly distributed upper tooth disc holes, namely the first upper tooth disc hole (1302), the second upper tooth disc hole (1303), the third upper tooth disc hole (1304), the fourth upper tooth disc hole (1305), the fifth upper tooth disc hole (1306), the sixth upper tooth disc hole (1308), the seventh upper tooth disc hole (1309), and the eighth upper tooth disc hole (1310); At the axis center of the upper tooth disc (1300), there is an upper tooth disc groove (1307). At the center of the upper tooth disc groove (1307), there is an upper tooth disc through hole (1315). The other side of the upper tooth disc (1300) is provided with four uniformly distributed upper tooth disc holes, namely the ninth upper tooth disc hole (1311), the tenth upper tooth disc hole (1312), the eleventh upper tooth disc hole (1313), and the twelfth upper tooth disc hole (1314).

5. A differential gearbox with a large transmission ratio and a self-locking function according to claim 4, characterized in that: The outer surface of the housing (200) is provided with four uniformly distributed protrusions, namely the first housing protrusion (201), the second housing protrusion (202), the third housing protrusion (203), and the fourth housing protrusion (204). The outer surface of the housing (200) is provided with four uniformly distributed housing holes, and the housing holes and the protrusions are arranged at intervals. The housing holes are respectively the first housing hole (205), the second housing hole (206), the third housing hole (207), and the fourth housing hole (208); The inner wall of the housing (200) is provided with an annular protrusion (209). An annular groove (210) is formed between the annular protrusion (209) and the housing (200). The lower bearing (100) is adapted to the annular groove (210).

6. A large transmission ratio differential gearbox with a self-locking function according to claim 5, characterized in that: The lower tooth disc (300) is in a stepped shape, including a large-diameter layer (306) and a small-diameter layer (305). The outer surface of the small-diameter layer (305) is provided with four uniformly distributed lower tooth disc holes, namely the first lower tooth disc hole (301), the second lower tooth disc hole (302), the third lower tooth disc hole (303), and the fourth lower tooth disc hole (304). At the axis center of the small-diameter layer (305), there is a lower tooth disc through hole (310). A circular lower tooth disc protrusion (309) is fixedly installed on the inner wall of the lower tooth disc through hole (310). The inner wall of the large-diameter layer (306) is provided with a plurality of teeth (307). A lower tooth disc partition (308) is installed on the inner wall of the large-diameter layer (306). The lower tooth disc partition (308) is communicated with the lower tooth disc through hole (310).

7. A large transmission ratio differential gearbox with a self-locking function according to claim 6, characterized in that: The upper tooth disc through hole (1315) is the input end, and the upper tooth disc through hole (1315) corresponds to the sun gear (1100).

8. A large transmission ratio differential gearbox with a self-locking function according to claim 7, characterized in that: The housing (200) fits with the lower tooth disc (300). The housing (200) is sleeved on the outside of the lower tooth disc (300). The lower tooth disc through hole (310) is the output end.

9. The self-locking large transmission ratio differential gearbox according to claim 8, characterized in that: The number of upper sprocket teeth (1301) of the upper sprocket (1300) is thirty-five, and the number of teeth (307) of the lower sprocket (300) is thirty-four.

10. A large transmission ratio differential gearbox with a self-locking function according to claim 9, characterized in that: The outer surface of the sun gear (1100) is provided with sun gear teeth (1110). The number of the sun gear teeth (1110) is ten, and a sun gear through hole (1120) is provided at the axis of the sun gear (1100).

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