Speed reduction device and speed reducer

Abstract

The present application relates to a speed reduction device and a speed reducer, which are applied to the field of mechanical transmission. The speed reduction device comprises a drive unit, a transmission block, a driving unit and a driven unit, wherein the driving unit passes through the transmission block and is in threaded connection with the transmission block; the drive unit drives the driving unit to generate movement, and the driven unit is driven to generate movement under the drive of the transmission block; and when the drive unit is actuated, the rotating speed of the driving unit is greater than that of the driven unit. The present application has the technical effects that the problem of arranging a speed reduction device with a large reduction ratio in the case where a radial space is limited and an available space is elongated is solved, and the output requirement of a large torque can be met, such that the operation effect of the speed reduction device is improved.

Description

Speed reduction device and speed reducer TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical transmission, in particular to a speed reduction device and speed reducer. BACKGROUND

[0002] The speed reduction device is a mechanical device, mainly used for reducing the speed of mechanical equipment to meet the working requirements of the equipment. Large reduction ratio speed reduction devices are required in the motion parts such as vehicle-mounted electric ceiling screens and automobile electric spoilers to meet the output requirements of large torque. However, the use space of the application such as vehicle-mounted electric ceiling screens and automobile electric spoilers is usually a narrow strip shape, and the radial space activity range is small.

[0003] Publication No. CN207795993U discloses a worm gear reducer, which comprises a housing, a worm gear and a worm. The worm and the worm gear are arranged in the housing. The worm gear and the worm have meshing teeth I and meshing teeth II, respectively. The meshing teeth I and the meshing teeth II are engaged with each other. The characteristic is that the curvature radius of the meshing teeth I is greater than the curvature radius of the meshing teeth II. TECHNICAL PROBLEM

[0004] The above-mentioned worm gear reducer needs a large use space to improve the torque capacity during use, is easily limited by the narrow and long shape of the radial space, and is difficult to achieve the large torque output requirement, resulting in low running efficiency. TECHNICAL SOLUTION

[0005] In order to help solve the problem that the existing speed reduction device needs a large radial space to improve the torque capacity, and it is difficult to achieve the large torque output requirement in the case that the radial space is limited and the available space is in a long and narrow shape, the present application provides a speed reduction device and speed reducer, which adopts the following technical solution: a driving unit, a transmission block, a driving unit and a driven unit. The driving unit is threaded through the transmission block and is connected with the transmission block. The driving unit drives the driving unit to move. The driven unit moves under the drive of the transmission block. When the driving unit is started, the rotation speed of the driving unit is greater than that of the driven unit.

[0006] Through the above technical solution, the driving unit is started to drive the driving unit to rotate. The transmission block moves with the rotation of the driving unit. The transmission block drives the driven unit to move, so that the driven unit rotates with the movement of the transmission block, realizing the speed reduction of the output end of the driven unit. The compact structure of the speed reduction device solves the problem of arranging the large reduction ratio speed reduction device in the case that the radial space is limited and the available space is in a long and narrow shape, and can realize the output requirement of large torque, thereby improving the running effect of the speed reduction device.

[0007] In a specific implementation scheme, one end of the driven unit is an output end, and the output end of the driving unit is connected with one end of the driving unit.

[0008] By the above technical scheme, when the output end of the driven unit and the driving unit are located at opposite sides, the speed reduction can be realized in the case that the available space is in an elongated shape; when the output end of the driven unit and the driving unit are located at the same side, the radial space occupied by the speed reduction device is further reduced.

[0009] In one specific implementation, the transmission block, the driving unit and the driven unit are arranged inside a housing, and the driving unit is arranged outside the housing.

[0010] By the above technical scheme, the housing serves as a protective layer to stably support the components inside the housing, so that the driving unit and the driven unit inside the housing can maintain a relatively stable position, and the housing can effectively prevent dust and impurities from entering the housing, thereby reducing the possibility of failure.

[0011] In one specific implementation, the transmission block comprises a moving block, the moving block is bolted with a first connecting block and a second connecting block respectively, and the moving block is located between the first connecting block and the second connecting block, the driving unit is sequentially arranged through the first connecting block, the moving block and the second connecting block and is threadedly connected with the moving block, and the driven unit moves under the drive of the moving block.

[0012] By the above technical scheme, the first connecting block and the second connecting block are connected with the moving block, which strengthens the rigidity of the transmission block as a whole, thereby improving the stability of the transmission block during operation.

[0013] In one specific implementation, the driving unit comprises a first screw rod, both ends of the first screw rod are rotationally connected with the housing, a first through hole matched with the first screw rod is formed in the transmission block, the first screw rod is arranged through the first through hole and is threadedly connected with the transmission block.

[0014] By the above technical scheme, the driving unit is started to drive the first screw rod to rotate, the transmission block on the first screw rod reciprocally moves along the first screw rod with the rotation of the first screw rod, and the driven unit rotates with the movement of the transmission block, thereby realizing the speed reduction of the output end of the driven unit.

[0015] In one specific implementation, a first spiral groove is formed in the outer edge of the first screw rod, a second spiral groove matched with the first spiral groove is formed in the hole wall of the first through hole, a first rolling cavity is formed between the first spiral groove and the second spiral groove, and a plurality of first circulating balls are arranged in the first rolling cavity.

[0016] By the above technical scheme, the first circulating balls move by rolling rather than sliding, which reduces the friction between the first screw rod and the transmission block, thereby improving the mechanical efficiency.

[0017] In one specific implementation, the driven unit comprises a second screw rod, two ends of the second screw rod are rotatably connected with the housing respectively, a second through hole matched with the second screw rod is formed on the transmission block, the second screw rod is threaded through the second through hole and is threadedly connected with the transmission block.

[0018] According to the above technical solution, when power is transmitted along the power transmission path, the second screw rod is selected to make the rotation speed of the driven unit less than the rotation speed of the driving unit, so that a large reduction ratio is achieved.

[0019] In one specific implementation, a third spiral groove is formed on the outer edge of the second screw rod, a fourth spiral groove matched with the third spiral groove is formed on the hole wall of the second through hole, a second rolling cavity is formed between the third spiral groove and the fourth spiral groove, and a plurality of second circulating balls are arranged in the second rolling cavity.

[0020] According to the above technical solution, the second circulating balls move by rolling rather than sliding, which reduces the friction between the second screw rod and the transmission block, and further improves the mechanical efficiency.

[0021] In one specific implementation, the driven unit comprises a transmission shaft, two ends of the transmission shaft are rotatably connected with the housing respectively, a transmission rod is arranged on the outer edge of the transmission shaft in a spiral manner, a transmission hole matched with the transmission shaft and a plug-in hole matched with the transmission rod are formed on the transmission block respectively, the transmission shaft is threaded through the transmission hole, and the transmission rod is threaded through the plug-in hole.

[0022] According to the above technical solution, the transmission rod arranged on the outer edge of the transmission shaft in a spiral manner can improve the torsional stiffness of the transmission shaft, increase the theoretical contact point radius, and thus reduce the friction loss between the transmission shaft and the transmission block.

[0023] In one specific implementation, the driven unit comprises a rotating shaft, two ends of the rotating shaft are rotatably connected with the housing respectively, a rotating hole matched with the rotating shaft is formed on the transmission block, the rotating shaft is threaded through the rotating hole, a rotating groove arranged on the outer edge of the rotating shaft in a spiral manner is formed on the hole wall of the rotating hole, and a rotating block matched with the rotating groove is arranged on the hole wall of the rotating hole.

[0024] According to the above technical solution, the rotating groove arranged on the outer edge of the rotating shaft in a spiral manner and the rotating block arranged on the hole wall of the rotating hole matched with the rotating groove can improve the torsional stiffness of the rotating shaft as a whole, increase the theoretical contact point radius, and thus reduce the friction loss.

[0025] In one specific implementation, the driven unit comprises a screw rod, two ends of the screw rod are rotatably connected with the housing, a screw hole matched with the screw rod is formed on the transmission block, and the screw rod passes through the screw hole.

[0026] By the above technical solution, the torsional strength of the screw rod is improved, the contact area between the screw rod and the transmission block is increased, and the friction loss is reduced.

[0027] In one specific implementation, the transmission block is slidably connected with the housing through a sliding unit.

[0028] By the above technical solution, the stability of the transmission block during movement is improved by using the sliding unit, and the rigidity of the overall structure is enhanced.

[0029] In one specific implementation, the sliding unit comprises a sliding block arranged on the transmission block, and a sliding groove matched with the sliding block is formed on the housing, and the sliding block is slidably connected in the sliding groove.

[0030] By the above technical solution, the sliding groove limits the position of the sliding block, so that the transmission block slides along the sliding groove through the sliding block, the possibility of deviation of the transmission block during sliding is reduced, and the stability of the transmission block during movement is improved.

[0031] In one specific implementation, a sliding gasket is arranged on the sliding block, and the sliding gasket is located between the sliding block and the sliding groove and is in contact with the groove wall of the sliding groove.

[0032] By the above technical solution, the sliding gasket reduces the friction between the sliding block and the sliding groove, so that the transmission block slides more smoothly, the wear between the sliding block and the housing is reduced, and the service life is prolonged.

[0033] In one specific implementation, the sliding unit comprises a guide rail arranged on the housing, a guide groove matched with the guide rail is formed on a surface of the transmission block facing the guide rail, and the guide rail is slidably connected in the guide groove.

[0034] By the above technical solution, the transmission block slides along the guide groove through the guide rail, the guide groove limits the position of the guide rail, the possibility of deviation of the transmission block during sliding is reduced, and the stability of the transmission block during movement is improved.

[0035] In one specific implementation, a speed reduction unit is arranged at the output end of the driving unit, and one end of the driving unit is fixedly connected with the input end of the driving unit.

[0036] By the above technical solution, the speed reduction unit can reduce the rotating speed of the output end of the driving unit, and increase the input torque of the input end of the driving unit, thereby further improving the speed reduction effect.

[0037] In one specific implementation, the speed reduction device is applied to an electric sunroof, an electric spoiler, a sporty interior, a sporty exterior or an electric door.

[0038] In one specific implementation, two speed reduction devices according to any one of claims 1 to 15 are connected in series.

[0039] By the above technical solution, the speed reduction devices are connected in series to realize output torque superposition, provide greater output torque, make the speed reduction device have stronger carrying capacity, and there will be a phase difference between the transmission blocks. The motion gap is eliminated by series pre-tightening. Advantages

[0040] In summary, the present application has the following advantages:

[0041] (1) The speed reduction device has a compact structure, solves the problem of arranging a large reduction ratio speed reduction device in a limited radial space and an elongated available space, can realize large torque output demand, and thus improves the operation effect of the speed reduction device.

[0042] (2) The speed reduction devices are connected in series to realize output torque superposition, provide greater output torque, make the speed reduction device have stronger carrying capacity, and there will be a phase difference between the transmission blocks. The motion gap is eliminated by series pre-tightening. BRIEF DESCRIPTION OF DRAWINGS

[0043] FIG. 1 is a schematic diagram of the overall structure of the embodiment one of the present application.

[0044] FIG. 2 is a schematic diagram of the structure for embodying the first screw rod in the embodiment one of the present application.

[0045] FIG. 3 is a schematic diagram of the structure for embodying two speed reduction devices connected in series in the embodiment one of the present application.

[0046] FIG. 4 is a schematic diagram of the structure for embodying the transmission shaft in the embodiment two of the present application.

[0047] FIG. 5 is a schematic diagram of the structure for embodying the rotating shaft in the embodiment three of the present application.

[0048] FIG. 6 is a schematic diagram of the structure for embodying the screw rod in the embodiment four of the present application.

[0049] Fig. 1 is a schematic view of the transmission device according to the present application; Fig. 2 is a schematic view of the transmission device according to the present application; Fig. 3 is a schematic view of the transmission device according to the present application; Fig. 4 is a schematic view of the transmission device according to the present application; Fig. 5 is a schematic view of the transmission device according to the present application; Fig. 6 is a schematic view of the transmission device according to the present application. Embodiment of the present application

[0050] The present application will be further described in detail below with reference to Figs. 1-6.

[0051] The present application discloses a speed reducer and a speed reducer.

[0052] Embodiment one

[0053] Referring to Figs. 1 and 2, the speed reducer comprises a housing 3 and a transmission block 4, and the housing 3 in the present application is spliced by two housing plates bolted together. The housing 3 is rotationally connected with a driving unit 16 and a driven unit 17 respectively, the driving unit 16 is threaded through the transmission block 4 and is screwed with the transmission block 4, the driven unit 17 is rotated under the drive of the transmission block 4, and the speed reducer further comprises a driving unit 2 for driving the driving unit 16 to rotate, the driving unit 2 can adopt a driving component such as a driving motor or a driving motor, and the driving unit 2 in the present application adopts a servo motor. When the driving unit 2 is started, the rotation speed of the driving unit 16 is greater than that of the driven unit 17.

[0054] Referring to Figs. 1 and 2, the transmission block 4 comprises a moving block 19, the moving block 19 is bolted with a first connecting block 20 and a second connecting block 21 respectively and is located between the first connecting block 20 and the second connecting block 21, the driving unit 16 is threaded through the first connecting block 20, the moving block 19 and the second connecting block 21 in sequence and is screwed with the moving block 19, and the driven unit 17 moves under the drive of the moving block 19. The operator can also set the driving unit 16 to be screwed with the first connecting block 20, the moving block 19 and the second connecting block 21 according to the actual situation. Therefore, the first connecting block 20 and the second connecting block 21 are connected with the moving block 19, which strengthens the rigidity of the whole transmission block 4, thereby improving the stability of the transmission block 4 during operation.

[0055] Referring to Figs. 1 and 2, one end of the driven unit 17 is an output end, the output end of the driving unit 2 is connected with one end of the driving unit 16, when the output end of the driven unit 17 and the driving unit 2 are located at opposite sides, the speed reducer can be realized under the condition that the available space is in an elongated shape; when the output end of the driven unit 17 and the driving unit 2 are located at the same side, the radial space occupied by the speed reducer is further reduced.

[0056] Referring to FIG. 1 and FIG. 2, the main unit 16 comprises a first screw rod 8, the driven unit 17 comprises a second screw rod 9, the first screw rod 8 and the second screw rod 9 are parallel to each other, and both ends of the first screw rod 8 and the second screw rod 9 are rotatably connected with the shell 3 through bearings 12. Therefore, the bearings 12 can bear the load in axial, radial and inclination directions from the first screw rod 8 and the second screw rod 9, so that the first screw rod 8 and the second screw rod 9 are more stable when rotating, the abrasion between the first screw rod 8 and the second screw rod 9 and the shell 3 is reduced, the service life is prolonged, and the movement efficiency of the first screw rod 8 and the second screw rod 9 is improved. It should be noted that, in addition to the rotatable connection between the bearings 12 and the shell 3, the two ends of the first screw rod 8 and the first screw rod 9 can also be rotatably connected with the shell 3 through self-lubricating bushings.

[0057] Referring to FIG. 1 and FIG. 2, the transmission block 4 is provided with a first through hole 10 matched with the size of the first screw rod 8 and a second through hole 11 matched with the size of the second screw rod 9, the first screw rod 8 passes through the first through hole 10 and is threadedly connected with the transmission block 4, and the second screw rod 9 passes through the second through hole 11 and is threadedly connected with the transmission block 4. By selecting the lead of the first screw rod 8 and the second screw rod 9, the lead of the second screw rod 9 is greater than that of the first screw rod 8; if the lead of the first screw rod 8 is S1 and the lead of the second screw rod 9 is S2, the speed ratio of the second screw rod 9 to the first screw rod 8 is S2:S1 when transmitting power according to the power transmission path, and the value of S2:S1 can reach 1-1000, so that large reduction ratio reduction is realized.

[0058] Therefore, the servo motor drives the first screw rod 8 to rotate, the transmission block 4 on the first screw rod 8 reciprocates along the first screw rod 8 with the rotation of the first screw rod 8, and the second screw rod 9 rotates with the movement of the transmission block 4. Since the lead of the second screw rod 9 is greater than that of the first screw rod 8, the output end of the second screw rod 9 is reduced.

[0059] Referring to FIG. 1 and FIG. 2, the speed reduction device further comprises a sliding unit, and the transmission block 4 is slidably connected with the shell 3 through the sliding unit. The sliding unit comprises a sliding block 13 fixedly connected to the transmission block 4, and the shell 3 is provided with a sliding groove 14 matched with the size of the sliding block 13, and the sliding block 13 is slidably connected in the sliding groove 14. The sliding block 13 is provided with a sliding gasket 15, the sliding gasket 15 is located between the sliding block 13 and the sliding groove 14 and is in contact with the groove wall of the sliding groove 14, and the sliding gasket 15 is made of self-lubricating material in the embodiment of the application. The sliding gasket 15 reduces the friction between the sliding block 13 and the sliding groove 14, so that the transmission block 4 slides more smoothly, the abrasion between the sliding block 13 and the shell 3 is reduced, and the service life is prolonged.

[0060] Therefore, the sliding groove 14 limits the position of the sliding block 13, so that the transmission block 4 slides along the sliding groove 14 through the sliding block 13, reduces the possibility of deviation of the transmission block 4 in the sliding process, and improves the stability of the movement of the transmission block 4.

[0061] It should be noted that the sliding unit can also be provided to include a guide rail provided on the shell 3, and the transmission block 4 is provided with a guide groove matching the size of the guide rail on the surface of the guide rail. The guide rail is slidably connected in the guide groove. The transmission block 4 slides along the guide groove through the guide rail, and the guide groove limits the position of the guide rail, reduces the possibility of deviation of the transmission block 4 in the sliding process, and improves the stability of the movement of the transmission block 4.

[0062] Referring to FIGS. 1 and 2, the outer edge of the first screw rod 8 is provided with a first spiral groove, the hole wall of the first through hole 10 is provided with a second spiral groove matching the first spiral groove, and the first spiral groove and the second spiral groove form a first rolling cavity. A plurality of first circulating balls are arranged in the first rolling cavity. The outer edge of the second screw rod 9 is provided with a third spiral groove, the hole wall of the second through hole 11 is provided with a fourth spiral groove matching the third spiral groove, and the third spiral groove and the fourth spiral groove form a second rolling cavity. A plurality of second circulating balls are arranged in the second rolling cavity. The circulating balls move in a rolling manner rather than a sliding manner, which reduces the friction between the first screw rod 8 and the second screw rod 9 and the transmission block 4, and further improves the mechanical efficiency.

[0063] Referring to FIGS. 1 and 2, the speed reduction unit is further arranged at the output end of the driving unit 2. The speed reduction unit can adopt a planetary gear reduction device or a multi-stage gear set reduction device. The output end of the speed reduction unit is fixedly connected with one end of the driving unit 16. The speed reduction unit can reduce the rotating speed of the output end of the driving unit 2, and increase the input torque of the input end of the driving unit 16, thereby further improving the speed reduction effect.

[0064] In addition, in the embodiment of the present application, the first screw rod 8 and the second screw rod 9 cooperate with the transmission block 4 to transmit power, the speed reduction device has low operation noise, and is suitable for occasions such as vehicle-mounted occasions with high noise requirements. Specifically, the speed reduction device of the present application can be applied to a vehicle-mounted electric ceiling screen or an electric spoiler of a car.

[0065] The implementation principle of the embodiment of the present application is that the servo motor is started to drive the first screw rod 8 to rotate, the transmission block 4 on the first screw rod 8 reciprocates along the first screw rod 8 with the rotation of the first screw rod 8, and the second screw rod 9 rotates with the movement of the transmission block 4. Since the lead of the second screw rod 9 is greater than the lead of the first screw rod 8, a large speed reduction ratio is achieved at the output end of the second screw rod 9. The speed reduction device has a compact structure, solves the problem of arranging a large speed reduction ratio speed reduction device in the case of limited radial space and available space in an elongated shape, can achieve the output demand of large torque, and thus improves the operation effect of the speed reduction device.

[0066] With reference to FIGS. 1 and 3, it is to be explained that, in order to realize output torque superposition, provide greater output torque, and make the reducer have stronger bearing capacity, the reducer in the embodiment of the application can also adopt the form of connecting two or more groups of structural reducers in series. The two groups in series are taken as an example for description in the embodiment of the application, and the specific setting mode is that the driven units 17 of the two reducers are connected. When the reducers are used in series, the driving units 2 of the two reducers are started at the same time, and the two driven units 17 are connected and have the same speed. Preferably, the two driven units 17 can be connected coaxially. The coaxial connection improves the transmission efficiency and further reduces the use space occupied by the whole reducer.

[0067] Embodiment two

[0068] With reference to FIGS. 1 and 4, it is to be explained that the difference between the embodiment two and the embodiment one of the application is that the driven unit 17 comprises a transmission shaft 18, the two ends of the transmission shaft 18 are rotatably connected with the shell 3 respectively, and the outer edge of the transmission shaft 18 is fixedly connected with the transmission rods 1 arranged in a spiral. The transmission block 4 is provided with a transmission hole matched with the size of the transmission shaft 18 and a plug-in hole matched with the transmission rod 1, and the transmission shaft 18 penetrates through the transmission hole and the transmission rod 1 penetrates through the plug-in hole. Therefore, the outer edge of the transmission shaft 18 is provided with the transmission rods 1 arranged in a spiral, that is, the transmission shaft 18 is formed by rotating and stretching along a spiral line with a specific cross-sectional shape, so as to improve the torsional stiffness of the transmission shaft 18, increase the theoretical contact point radius, and thus reduce the friction loss between the transmission shaft 18 and the transmission block.

[0069] Embodiment three

[0070] With reference to FIGS. 1 and 5, it is to be explained that the difference between the embodiment three and the embodiment one of the application is that the driven unit 17 comprises a rotating shaft 5, the two ends of the rotating shaft 5 are rotatably connected with the shell 3 respectively, the transmission block 4 is provided with a rotating hole matched with the size of the rotating shaft 5, the rotating shaft 5 penetrates through the rotating hole, the outer edge of the rotating shaft 5 is provided with rotating grooves 6 arranged in a spiral, and the hole wall of the rotating hole is provided with rotating blocks matched with the rotating grooves 6, and the rotating blocks are plugged into the rotating grooves 6. Therefore, the outer edge of the rotating shaft 5 is provided with the rotating grooves 6 arranged in a spiral, that is, the rotating shaft 5 is formed by rotating and stretching along a spiral line with a specific cross-sectional shape, the hole wall of the rotating hole is provided with the rotating blocks matched with the rotating grooves 6, the torsional strength of the whole rotating shaft 5 is improved by the setting of the rotating blocks and the rotating grooves 6, the theoretical contact point radius is increased, and thus the friction loss is reduced.

[0071] Embodiment four

[0072] Referring to FIG. 1 and FIG. 6, it is to be explained that the difference between the fourth embodiment of the present application and the first embodiment is that the driven unit 17 comprises a screw rod 7, both ends of the screw rod 7 are rotatably connected with the shell 3, a screw hole matching the size of the screw rod 7 is formed on the transmission block 4, and the screw rod 7 is arranged through the screw hole. Therefore, the screw rod 7 is formed by rotating and stretching along a spiral line with a specific cross-sectional shape, and the specific shape of the cross section of the screw rod 7 in the embodiment of the present application can adopt a rectangle, so as to improve the torsional strength of the screw rod 7, increase the contact area between the screw rod 7 and the transmission block 4, and thus reduce the friction loss.

[0073] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A speed reduction device characterized by: The drive unit (2), the transmission block (4), the driving unit (16) and the driven unit (17), the driving unit (16) is threaded through the transmission block (4) and is screwed with the transmission block (4), the driving unit (2) drives the driving unit (16) to move, the driven unit (17) moves under the drive of the transmission block (4); when the driving unit (2) starts, the rotating speed of the driving unit (16) is greater than that of the driven unit (17).

2. The reduction gear according to claim 1, characterized in that: One end of the driven unit (17) is the output end, and the output end of the driving unit (2) is connected with one end of the driving unit (16).

3. The reduction gear of claim 1, wherein: It also includes a shell (3), the transmission block (4), the driving unit (16) and the driven unit (17) are arranged in the shell, and the driving unit (2) is arranged outside the shell (3).

4. The reduction gear of claim 1, wherein: The transmission block (4) includes a moving block (19), the first connecting block (20) and the second connecting block (21) are bolted on the moving block (19) respectively, and the moving block (19) is located between the first connecting block (20) and the second connecting block (21), the driving unit (16) is threaded through the first connecting block (20), the moving block (19) and the second connecting block (21) in turn and is screwed with the moving block (19), and the driven unit (17) moves under the drive of the moving block (19).

5. The speed reduction device of claim 3, wherein: The driving unit (16) includes a first screw rod (8), both ends of the first screw rod (8) are rotatably connected with the shell (3), a first threaded hole (10) matched with the first screw rod (8) is formed in the transmission block (4), the first screw rod (8) is threaded through the first threaded hole (10) and is screwed with the transmission block (4).

6. The reduction gear of claim 5, wherein: The outer edge of the first screw rod (8) is provided with a first spiral groove, a second spiral groove matched with the first spiral groove is formed in the hole wall of the first threaded hole (10), a first rolling cavity is formed between the first spiral groove and the second spiral groove, and a plurality of first circulating balls are arranged in the first rolling cavity.

7. The speed reduction device of claim 3, wherein: The driven unit (17) includes a second screw rod (9), both ends of the second screw rod (9) are rotatably connected with the shell (3), a second threaded hole (11) matched with the second screw rod (9) is formed in the transmission block (4), and the second screw rod (9) is threaded through the second threaded hole (11) and is screwed with the transmission block (4).

8. The reduction gear of claim 7, wherein: The outer edge of the second screw rod (9) is provided with a third spiral groove, a fourth spiral groove matched with the third spiral groove is formed in the hole wall of the second threaded hole (11), a second rolling cavity is formed between the third spiral groove and the fourth spiral groove, and a plurality of second circulating balls are arranged in the second rolling cavity.

9. The speed reduction device of claim 3, wherein: The driven unit (17) includes a transmission shaft (18), both ends of the transmission shaft (18) are rotatably connected with the shell (3), the outer edge of the transmission shaft (18) is provided with a plurality of transmission rods (1) arranged in a spiral manner, a transmission hole matched with the transmission shaft (18) and a plug-in hole matched with the transmission rod (1) are formed in the transmission block (4) respectively, the transmission shaft (18) is threaded through the transmission hole, and the transmission rod (1) is threaded through the plug-in hole.

10. The speed reduction device of claim 3, wherein: The driven unit (17) comprises a rotating shaft (5), two ends of the rotating shaft (5) are rotatably connected with the shell (3), the transmission block (4) is provided with a rotating hole matched with the rotating shaft (5), the rotating shaft (5) passes through the rotating hole, the outer edge of the rotating shaft (5) is provided with a rotating groove (6) arranged in a spiral manner, the rotating hole is provided with a rotating block matched with the rotating groove (6), and the rotating block is inserted into the rotating groove (6).

11. The reduction gear of claim 3, wherein: The driven unit (17) comprises a rotating shaft (5), two ends of the rotating shaft (5) are rotatably connected with the shell (3), the transmission block (4) is provided with a rotating hole matched with the rotating shaft (5), the rotating shaft (5) passes through the rotating hole, the outer edge of the rotating shaft (5) is provided with a rotating groove (6) arranged in a spiral manner, the rotating hole is provided with a rotating block matched with the rotating groove (6), and the rotating block is inserted into the rotating groove (6).

12. The reduction gear of claim 3, wherein: The sliding unit is further arranged, and the transmission block (4) is slidably connected with the shell (3) through the sliding unit.

13. The speed reduction device of claim 12, wherein: The sliding unit comprises a sliding block (13) arranged on the transmission block (4), and the shell (3) is provided with a sliding groove (14) matched with the sliding block (13), and the sliding block (13) is slidably connected in the sliding groove (14).

14. The speed reduction device of claim 13, wherein: The sliding block (13) is provided with a sliding gasket (15), and the sliding gasket (15) is located between the sliding block (13) and the sliding groove (14) and is in contact with the groove wall of the sliding groove (14).

15. The reduction gear of claim 12, wherein: The sliding unit comprises a guide rail arranged on the shell (3), and the transmission block (4) is provided with a guide groove matched with the guide rail on the surface facing the guide rail, and the guide rail is slidably connected in the guide groove.

16. The reduction device of claim 1, wherein: The speed reduction unit is further arranged at the output end of the driving unit (2), and one end of the speed reduction unit is fixedly connected with the driving unit (16).

17. The reduction device of claim 1, wherein: The speed reduction device is applied to a vehicle-mounted electric ceiling screen, a car electric tail wing, a vehicle-mounted sports interior, a vehicle-mounted sports exterior or a car electric door.

18. A speed reducer characterized by: Two speed reduction devices connected in series are arranged. Two speed reduction devices connected in series are arranged.

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