Upper and lower rail main transmission case

Abstract

The utility model relates to a main transmission case for an upper rail and a lower rail. A transmission main shaft, two belt pulleys and two iron pieces are arranged in the main transmission case. And a clutch part is arranged between the iron piece and the corresponding belt pulley. After the main transmission case is adopted, when the two clutch parts are in a meshed state, curtains on the two sides can be opened and closed together; when one of the clutch parts is in a meshed state, the curtain on one side can be opened and closed independently. By arranging the limiting structure, the limiting structure can limit rotation of a single iron piece or rotation of two iron pieces according to requirements, the limiting structure can adopt the mode that the driving source drives the first limiting part and the second limiting part to rotate at the same time, the purpose that the limiting structure limits the single iron piece or the two iron pieces can be achieved, the number of adopted driving sources is small, and the cost is low. The device can be conveniently installed in a transmission case, and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric curtain accessories, in particular to an upper and lower rail main transmission box. Background Art

[0002] The electric curtain track in the prior art is divided into two left and right arrangements of the first track and the second track, and then the transmission belt is wound in the two transmission belt grooves, resulting in a wider overall track width, which is not suitable for the current trend of increasingly narrow curtain tracks.

[0003] In this regard, the existing single track is divided into an upper track and a lower track to solve the above technical problems, so that a curtain can be opened synchronously and the curtains on both sides can be opened and closed separately, which solves the technical problem that the opening and position of a single curtain is only opened in the middle or fixed on one side; however, the existing technology uses two external motors and connects two transmission main shafts to output pulleys at different levels to achieve separate control of the two pulleys, which is costly and cannot control the simultaneous or separate operation of the two pulleys by a single motor and a single transmission main shaft. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing technology adopts two main shafts and two motors to output pulleys at different levels to achieve separate control of the two pulleys, which is costly and cannot control the simultaneous or separate operation of the two pulleys through a single motor and a single transmission main shaft.

[0005] The utility model solves the above-mentioned technical problems through the following technical solutions: an upper and lower rail main transmission box, wherein the main transmission box is provided with: a transmission main shaft; two pulleys and two iron pieces corresponding to the pulleys are coaxially connected to the transmission main shaft, and the pulleys and the iron pieces are rotatably connected to the transmission main shaft; a clutch part is provided between the iron piece and the corresponding pulley; the clutch part includes: a rotating part, the rotating part is transmission-connected to the transmission main shaft, two magnetic beads are adsorbed on the iron piece, the two magnetic beads are respectively located on the opposite sides of the rotating part, two grooves are provided on the inner side wall of the pulley, and a limiting structure is provided, wherein the limiting structure includes a driving source, and the two ends of the driving source are respectively transmission-connected with a first limiting part and a second limiting part, and the driving source simultaneously drives the first limiting part and the second limiting part to move to limit the rotation of any one or two of the iron pieces.

[0006] Specifically, the iron piece is fixedly connected to a limiting gear, or the iron piece is provided with a plurality of limiting teeth along its circumference.

[0007] Specifically, the two pulleys are located between the two iron pieces.

[0008] Specifically, the first limiting portion includes a first shaft body, and a first fixed tooth and a third fixed tooth are provided on the outer wall of the first shaft body at the same level, and a gap is provided between the first fixed tooth and the third fixed tooth.

[0009] Specifically, the second limiting portion includes a second shaft body, and a second fixed tooth and a fourth fixed tooth at the same horizontal height are provided on the outer wall of the second shaft body, a gap is provided between the second fixed tooth and the fourth fixed tooth, and the first fixed tooth and the second fixed tooth are misaligned in horizontal projection; the angular position of the third fixed tooth along the circumferential direction of the first shaft body is consistent with the angular position of the fourth fixed tooth along the circumferential direction of the second shaft body.

[0010] Specifically, the driving source is a dual-output motor, and the two output shafts of the dual-output shaft motor are respectively connected to the first shaft body and the second shaft body, and the first shaft body and the second shaft body are located on both sides of the dual-output shaft motor.

[0011] Specifically, the driving source is a single-output shaft motor, the output shaft of the single-output shaft motor is connected to one of the first shaft body and the second shaft body, a transmission structure is connected between the first shaft body and the second shaft body, and the first shaft body and the second shaft body are located on both sides of the single-output shaft motor.

[0012] Specifically, the transmission structure includes a transmission shaft, a first gear fixedly connected to the first shaft, and a fourth gear fixedly connected to the second shaft; the first gear is engaged with the second gear, the fourth gear is engaged with the third gear, and the second gear and the third gear are both coaxially connected to the transmission shaft.

[0013] Specifically, the synchronous transmission ratio of the first shaft and the second shaft is 1.

[0014] Specifically, the first shaft is connected to a first fixed disk, and the first fixed teeth and the third fixed teeth are formed on the first fixed disk; the second shaft is connected to a second fixed disk, and the second fixed teeth and the fourth fixed teeth are formed on the second fixed disk.

[0015] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present utility model.

[0016] The positive progressive effect of the present invention is that after adopting the above-mentioned main transmission box, when both clutch parts are in a meshing state, a single transmission main shaft can be driven by a single motor, and the two pulleys can be driven to rotate simultaneously by the single transmission main shaft, so that the curtains on both sides can be opened and closed together; when one of the two clutch parts is in a meshing state, a single motor drives a single transmission main shaft to drive the corresponding pulley to rotate, so that the curtains on one side can be opened and closed separately. A single motor and a single transmission main shaft are low in cost and suitable for large-scale production applications. By setting a limiting structure, the limiting structure can limit the rotation of a single iron piece or the rotation of two iron pieces according to demand. The limiting structure uses a driving source to drive the first limiting part and the second limiting part to rotate simultaneously, which can achieve the purpose of the limiting structure limiting a single iron piece or limiting two iron pieces at the same time. The number of driving sources used is small, which is convenient for installation in the transmission box and saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of an upper and lower rail main transmission box of the utility model.

[0018] Figure 2 This is an exploded view of the upper and lower rail main transmission box of the utility model.

[0019] Figure 3 This is a structural diagram of the interior of the main transmission box in this utility model.

[0020] Figure 4 This is a structural diagram of the central axis, the first fixed plate, and the second fixed plate of the present invention.

[0021] Figure 5 This is an exploded view of the clutch in the utility model.

[0022] Figure 6 for Figure 5 Top view in .

[0023] Figure 7 This is a structural diagram of an upper and lower rail main transmission box of the utility model.

[0024] Figure 8 This is a structural diagram of the upper and lower rail main transmission box and the upper and lower rails of the utility model.

[0025] Explanation of the accompanying drawings: 1. Main transmission box; 2. Mounting plate; 3. Transmission main shaft; 4. Limiting gear; 5. Pulley; 6. Clutch part; 7. Third gear; 8. Fourth gear; 9. Single output shaft motor; 10. Rotating part; 11. Iron part; 12. Magnetic bead; 13. Groove; 14. First shaft; 15. Second shaft; 16. First fixed disk; 17. Second fixed disk; 18. First fixed tooth; 19. Second fixed tooth; 20. Third fixed tooth; 21. Fourth fixed tooth; 22. First bearing; 23. First gear; 24. Transmission shaft; 25. Second gear; 26. Drive source. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that in the claims and description of this patent, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. In the absence of further restrictions, an element defined by the phrase "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus comprising the element.

[0028] The utility model discloses an upper and lower rail main transmission box 1, such as Figure 1-8 As shown, the main transmission box 1 is provided with: a transmission main shaft 3; two pulleys 5 and two iron pieces 11 corresponding to the pulleys 5 are coaxially connected to the transmission main shaft 3, and the pulleys 5 and the iron pieces 11 are both rotatably connected to the transmission main shaft 3; a clutch part 6 is provided between the iron piece 11 and the corresponding pulley 5; the clutch part 6 includes: a rotating member 10, which is transmission-connected to the transmission main shaft 3, two magnetic beads 12, which are adsorbed on the iron piece 11, and the two magnetic beads 12 are respectively located on opposite sides of the rotating member 10, and two grooves 13 are provided on the inner side wall of the pulley 5.

[0029] The limiting structure includes a driving source 26, and the two ends of the driving source 26 are respectively connected to the first limiting part and the second limiting part. The driving source 26 drives the first limiting part and the second limiting part to move at the same time to limit the rotation of any one or two iron parts 11.

[0030] The structures of the two pulleys 5 are completely identical, and the structures of the two iron pieces 11 are completely identical. The iron piece 11 is preferably made of iron or iron alloy, which is easier to manufacture and can be attracted by the magnetic beads 12.

[0031] The internal structure of the main transmission box 1 is as follows: Figure 2 As shown, the principle is described in detail below: the rotating member 10 is preferably an elliptical member, and the two magnetic beads 12 are preferably arranged symmetrically about the center of the rotating member 10. The two magnetic beads 12 are directly adsorbed on the iron member 11. In the initial state, the rotating member 10 is located between the two magnetic beads 12, and the magnetic beads 12 are adsorbed on the iron member 11 and do not move. At this time, when the transmission main shaft 3 rotates, the rotating member 10 rotates along with the transmission main shaft 3, so that the rotating member 10 and the magnetic beads 12 are offset. Due to the adsorption force between the magnetic beads 12 and the iron member 11, the magnet and the iron member 11 are simultaneously driven and rotated by the transmission main shaft 3. The adsorption force between the two magnetic beads 12 and the iron member 11 is greater than the gravity of the iron member 11, so that the rotating member 10 and the iron member 11 rotate synchronously. Moreover, at this time, the two magnetic beads 12 do not cooperate with the two grooves 13, so the clutch part 6 is in a disengaged state.

[0032] When the iron piece 11 does not rotate, the rotation of the iron piece 11 can be limited by the limiting structure. At this time, since the transmission main shaft 3 is rotating, the iron piece 11 is restricted by the limiting structure and cannot rotate. At this time, the rotating member 10 rotates relative to the iron piece 11, that is, when the rotating member 10 rotates, it pushes the magnetic beads 12 on both sides, so that the two magnetic beads 12 are respectively stuck into the two grooves 13, forming a state in which the rotating member 10 and the pulley 5 are abutted by the magnetic beads 12. At this time, the clutch 6 is in a meshing state, and when the transmission main shaft 3 continues to rotate, it will drive the pulley 5 to rotate simultaneously. There is a certain distance between the iron piece 11 and the groove 13, but this distance is less than the diameter of the magnetic beads 12. This ensures that after a portion of the magnetic beads 12 enters the groove 13, the rest of the magnetic beads 12 still contacts the iron piece 11, and the magnetic beads 12 always remain in contact with the iron piece 11.

[0033] The aforementioned limiting structure is used to limit the rotation of the iron piece 11. In the present application, the limiting structure includes a drive source 26, which is preferably a motor. The motor drives the first limiting portion and the second limiting portion to rotate simultaneously, wherein the motor drives the first limiting portion and the second limiting portion to rotate to different angular positions to limit the rotation of any one or two iron pieces 11. User operation is also relatively convenient, as only a single drive source 26 needs to be operated.

[0034] In summary, when the driving source drives the first limiting part and the second limiting part simultaneously, one of the first limiting part and the second limiting part cooperates with one iron piece 11, and the other of the first limiting part and the second limiting part does not cooperate with the other, when the rotation of the single iron piece 11 is restricted, the single clutch part 6 is in a meshing state, and the single motor drives the transmission main shaft 3 to rotate, realizing the rotation of the single pulley 5, and ultimately achieving the purpose of single-sided opening and closing; when the first limiting part and the second limiting part simultaneously restrict the rotation of the two iron pieces 11, the two clutch parts 6 are both in a meshing state, and the single motor drives the transmission main shaft 3 to rotate, realizing the simultaneous rotation of the two pulleys 5, and ultimately achieving the purpose of opening and closing the curtains on both sides. The structure is compact and the internal space occupancy is small. With the above structure, the single motor and the single transmission main shaft 3 are low in cost and suitable for large-scale production applications.

[0035] Specifically, the iron piece 11 is fixedly connected to the limiting gear 4 , or the iron piece 11 has a plurality of limiting teeth arranged along its circumference.

[0036] If the iron member 11 is provided separately, the corresponding first and second limiting portions need to be provided with magnetic members, which is relatively troublesome to magnetize. Preferably, a limiting gear 4 is fixedly connected to one side of the iron member 11, thereby preventing the iron member 11 from rotating by restricting the rotation of the limiting gear 4. In this case, the iron member 11 is preferably an iron ring, and the limiting gear 4 is fixedly connected to the iron member 11, and the limiting gear 4 has multiple teeth along the circumference.

[0037] In another way, a plurality of limiting teeth are directly processed and formed on the outer ring of the iron piece 11. The plurality of limiting teeth are arranged along the circumference of the iron piece 11.

[0038] Specifically, the two pulleys 5 are located between the two iron pieces 11 .

[0039] like Figure 1 Since the installation space of the main transmission box 1 is small, the size of the driving source 26 is limited, so the size of the corresponding first limiting part and the second limiting part is also limited. When the size of the first limiting part, the second limiting part and the size of the driving source 26 are too small, manufacturing is more difficult.

[0040] A mounting plate 2 is provided in the main transmission box 1, and two pulleys 5 are provided on both sides of the mounting plate 2. Preferably, the two pulleys 5 are installed on the front and back sides of the mounting plate 2, and the upper iron piece 11 is provided on the upper side of the upper pulley 5, and the lower iron piece 11 is provided on the lower side of the lower pulley 5. Then, when the limiting gear 4 is adopted, the upper limiting gear 4 is provided on the upper side of the upper iron piece 11, and the lower limiting gear 4 is provided on the lower side of the lower iron piece 11. In this way, the sizes of the first limiting portion and the second limiting portion are suitable for processing and can ensure reasonable transmission.

[0041] Specifically, the first limiting portion includes a first shaft 14 , and a first fixed tooth 18 and a third fixed tooth 20 are provided on an outer wall of the first shaft 14 at the same level. A gap is provided between the first fixed tooth 18 and the third fixed tooth 20 .

[0042] like Figure 4 As shown, there are two first fixed teeth 18, and the central angle of the first fixed teeth 18 relative to the circumference of the outer wall of the first shaft 14 is preferably 45 degrees. The gap between the two first fixed teeth 18 is engaged with the teeth or limiting teeth on the limiting gear 4. Similarly, there are also two third fixed teeth 20, and the central angle of the first fixed teeth 20 relative to the circumference of the outer wall of the first shaft 14 is preferably 45 degrees. A gap is provided between the first fixed teeth 18 and the third fixed teeth 20. In the initial state, the first fixed teeth 18 or the third fixed teeth 20 do not cooperate with the teeth or limiting teeth on the limiting gear 4. When the driving source 26 drives the first shaft 14 to rotate, the first fixed teeth 18 or the third fixed teeth 20 cooperate with the teeth or limiting teeth on the limiting gear 4 to limit the rotation of one iron piece 11.

[0043] Specifically, the second limiting portion includes a second shaft 15. A second fixed tooth 19 and a fourth fixed tooth 21 are provided on the outer wall of the second shaft 15 at the same height, with a gap between the second fixed tooth 19 and the fourth fixed tooth 21. The first fixed tooth 18 and the second fixed tooth 19 are offset in horizontal projection. The angular position of the third fixed tooth 20 along the circumference of the first shaft 14 is aligned with the angular position of the fourth fixed tooth 21 along the circumference of the second shaft 15.

[0044] like Figure 4 、 5 As shown, there are two second fixed teeth 19, and the central angle of the second fixed teeth 19 relative to the circumference of the outer wall of the second shaft 15 is preferably 45°. The gap between the two second fixed teeth 19 is engaged with the teeth or limiting teeth on the limiting gear 4. Similarly, there are also two fourth fixed teeth 21, and the central angle of the second fixed teeth 21 relative to the circumference of the outer wall of the second shaft 15 is preferably 45°. A gap is provided between the second fixed teeth 19 and the fourth fixed teeth 21. In the initial state, the second fixed teeth 19 or the fourth fixed teeth 21 do not cooperate with the teeth or limiting teeth on the limiting gear 4. When the driving source 26 drives the second shaft 15 to rotate, the second fixed teeth 19 or the fourth fixed teeth 21 cooperate with the teeth or limiting teeth on the limiting gear 4 to limit the rotation of one iron piece 11.

[0045] In order to ensure that when the first fixed teeth 18 cooperate with the corresponding iron piece 11, the second fixed teeth do not cooperate with the corresponding iron piece 11, the first fixed teeth 18 and the second fixed teeth 19 are arranged to be offset in horizontal projection. When the first fixed teeth 18 cooperate with the limiting teeth on the corresponding iron piece 11 or the teeth on the limiting gear 4, the second fixed teeth 19 do not cooperate with the limiting teeth on the corresponding iron piece 11 or the teeth on the limiting gear 4; when the second fixed teeth 19 cooperate with the limiting teeth on the corresponding iron piece 11 or the teeth on the limiting gear 4, the first fixed teeth 18 do not cooperate with the limiting teeth on the corresponding iron piece 11 or the teeth on the limiting gear 4. In this way, when the driving source 26 drives the first limiting part and the second limiting part to rotate simultaneously, only one of the first limiting part and the second limiting part cooperates with the iron piece 11.

[0046] To ensure that when the third fixed teeth 20 engage with the corresponding iron piece 11 , the fourth fixed teeth 21 also engage with the corresponding iron piece 11 , the angular position of the third fixed teeth 20 along the circumferential direction of the first shaft 14 and the angular position of the fourth fixed teeth 21 along the circumferential direction of the second shaft 15 are set to be consistent.

[0047] In order to ensure that after the first shaft 14 and the second shaft 15 rotate to the same angle, the third fixed teeth 20 can cooperate with the limiting teeth on one of the iron parts 11 or the teeth on the limiting gear 4, the fourth fixed teeth 21 can also cooperate with the limiting teeth on the other iron part 11 or the teeth on the limiting gear 4.

[0048] Therefore, the angular position of the third fixed tooth 20 along the circumferential direction of the first shaft 14 is consistent with the angular position of the corresponding fourth fixed tooth 21 along the circumferential direction of the second shaft 15. Figure 4 、 5 As shown, the above structure can reduce the number of driving sources 26. After the driving source 26 rotates a certain angle, the first limiting portion cooperates with one of the iron pieces 11, and at the same time, the second limiting portion cooperates with the other iron piece 11.

[0049] The above-mentioned angular position is defined as follows: when the central axes of the first shaft 14 and the second shaft 15 coincide, the horizontal projections of the third fixed tooth 20 and the fourth fixed tooth 21 in the axial direction coincide, or the horizontal projections of the third fixed tooth 20 and the fourth fixed tooth 21 in the axial direction have a horizontal difference. Figure 5 , is a horizontal projection of the third and fourth fixed teeth 20, 21 in the axial direction. The third and fourth fixed teeth 20, 21 overlap. In this case, the angular position of the third fixed tooth 20 along the circumference of the first shaft 14 is defined as being consistent with the angular position of the fourth fixed tooth 21 along the circumference of the second shaft 15.

[0050] When the central axes of the first shaft 14 and the second shaft 15 do not coincide, that is, when the third fixed tooth 20 moves horizontally to the left or right and is offset, there is a level difference between the horizontal projections of the third fixed tooth 20 and the fourth fixed tooth 21 in the axial direction. However, it is defined that the angular position of the third fixed tooth 20 along the circumferential direction of the first shaft 14 and the angular position of the fourth fixed tooth 21 along the circumferential direction of the second shaft 15 are still consistent.

[0051] Specifically, the driving source 26 is a dual-output motor, and the two output shafts of the dual-output shaft motor are respectively connected to the first shaft 14 and the second shaft 15 , and the first shaft 14 and the second shaft 15 are located on both sides of the dual-output shaft motor.

[0052] In one embodiment, the driving source 26 is a dual-output shaft motor, and the two output shafts of the dual-output shaft motor are respectively connected to the first shaft 14 and the second shaft 15. The first shaft 14 and the second shaft 15 are located on both sides of the dual-output shaft motor. The dual-output shaft motor is more convenient to assemble, and the first shaft 14 and the second shaft 15 can be directly assembled to the two output shafts of the dual-output shaft motor.

[0053] Specifically, the driving source 26 is a single output shaft motor 9, the output shaft of the single output shaft motor 9 is connected to one of the first shaft 14 and the second shaft 15, a transmission structure is connected between the first shaft 14 and the second shaft 15, and the first shaft 14 and the second shaft 15 are located on both sides of the single output shaft motor 9.

[0054] Since the installation space of the main transmission case 1 is small and the cost of a smaller dual-output motor is high, a single-output shaft motor 9 is used instead. The first shaft 14 and the second shaft 15 are connected by a transmission structure so that the driving source 26 can drive the first shaft 14 and the second shaft 15 to rotate simultaneously.

[0055] The transmission structure includes a transmission shaft 24, a first gear 23 fixedly connected to the first shaft 14, and a fourth gear 8 fixedly connected to the second shaft 15; the first gear 23 is engaged with the second gear 25, and the fourth gear 8 is engaged with the third gear 7. The second gear 25 and the third gear 7 are both coaxially connected to the transmission shaft 24.

[0056] On the basis of adopting a single output shaft motor 9, through the transmission of the first gear 23, the second gear 25, the transmission shaft 24, the third gear 7 and the fourth gear 8, it can be ensured that when the single output shaft motor 9 drives the first shaft 14, it can also synchronously drive the second shaft 15.

[0057] The first shaft 14 is connected to a first fixed plate 16 , on which first and third fixed teeth 18 and 20 are formed. The second shaft 15 is connected to a second fixed plate 17 , on which second and fourth fixed teeth 19 and 21 are formed.

[0058] Since the first fixed teeth 18, the second fixed teeth 19, the third fixed teeth 20, and the fourth fixed teeth 21 are often in contact with the teeth on the two limiting gears 4 or the two iron parts 11, directly setting the above-mentioned fixed teeth on the first shaft 14 or the second shaft 15 will reduce the life of the first shaft 14 or the second shaft 15. Therefore, a first fixed plate 16 is provided on the first shaft 14 and a second fixed plate 17 is provided on the second shaft 15. By setting the first fixed teeth 18 and the third fixed teeth 20 on the first fixed plate 16; and the second fixed teeth 19 and the fourth fixed teeth 21 on the second fixed plate 17, the wear rate of the first shaft 14 and the second shaft 15 can be reduced.

[0059] In order to facilitate the installation of the transmission main shaft 3, the transmission main shaft 3 is divided into an upper shaft and a lower shaft, and the upper shaft and the lower shaft can be plugged and connected to form the transmission main shaft 3.

[0060] Preferably, the synchronous transmission ratio of the first shaft body 14 and the second shaft body 15 is 1.

[0061] When the synchronous transmission ratio of the first shaft 14 and the second shaft 15 is 1, preferably, the central axes of the first shaft 14 and the second shaft 15 coincide, and when the diameters of the first shaft 14 and the second shaft 15 are the same, the second gear 25 and the third gear 7 are the same, and the first gear 23 and the fourth gear 8 are the same, that is, the second gear 25 and the third gear 7 can be processed in the same batch with high production efficiency, and the first gear 23 and the fourth gear 8 can be processed in the same batch with high production efficiency, so that the synchronous transmission ratio of the first shaft 14 and the second shaft 15 can be ensured to be 1, and the synchronous rotation of the first shaft 14 and the second shaft 15 can be ensured.

[0062] Of course, the central axes of the first shaft 14 and the second shaft 15 can also be set in parallel. In this case, the diameters of the first gear 23, the second gear 25, the third gear 7, and the fourth gear 8 are changed accordingly to ensure that the first shaft 14 and the second shaft 15 rotate synchronously, so that they can adapt to different installation spaces.

[0063] like Figure 5 As shown, a first angle α is defined between the first fixed tooth 18 and the third fixed tooth 20, and a second angle β is defined between the second fixed tooth 19 and the fourth fixed tooth 21. The first angle α ranges from 45° to 157.5°, and the second angle β ranges from 45° to 157.5°. Specifically, the first angle α is 120°, and the second angle β is 120°.

[0064] By setting the first angle α and the second angle β, it is ensured that when the central axes of the first shaft body 14 and the second shaft body 15 coincide, the first angle α and the second angle β do not overlap in the axial horizontal projection along the first shaft body 14 and the second shaft body 15. This ensures that the rotation angle of the single-output shaft motor 9 or the dual-output shaft motor can be reasonably preset. For example, when the driving source rotates 60°, one of the iron pieces 11 cooperates with the first limiting portion; when the driving source rotates 180°, the two iron pieces 11 cooperate with the first limiting portion and the second limiting portion respectively; when the driving source rotates 300°, the other iron piece 11 cooperates with the second limiting portion, so as to select the corresponding cooperation between the first limiting portion, the second limiting portion and one iron piece 11 or two iron pieces 11.

[0065] Preferably, the first angle α and the second angle β are both 120°, and the horizontal projection direction of the first fixed disk 16 or the second fixed disk 17 can be divided into three equal parts. Switching between each matching mode only requires presetting the single output shaft motor 9 or the dual output shaft motor to rotate 120°, which is more convenient.

[0066] A first bearing 22 is connected between the pulley 5 and the mounting plate 2. The arrangement of the first bearing 22 enables the pulley 5 to rotate on the mounting plate 2 more stably.

[0067] like Figure 6 As shown, the middle part of the side surface of the limiting gear 4 close to the pulley 5 protrudes toward the pulley 5, the iron piece 11 is fixedly connected to the side surface of the limiting gear 4, and the other side surface of the limiting gear 4 is provided with a recess.

[0068] One end of the transmission main shaft 3 is used to connect with the curtain opening and closing motor. After the transmission main shaft 3 of the curtain opening and closing motor is connected, the transmission main shaft 3 can be driven, thereby driving various components in the main transmission box 1.

[0069] Those skilled in the art will readily envision other embodiments of the present invention after considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the present invention being indicated by the following claims.

[0070] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An upper and lower rail main transmission box (1), characterized in that: The main transmission box (1) is provided with: A transmission main shaft (3); two pulleys (5) and two iron pieces (11) corresponding to the pulleys (5) are coaxially connected to the transmission main shaft (3); the pulleys (5) and the iron pieces (11) are both rotatably connected to the transmission main shaft (3); A clutch portion (6) is provided between the iron piece (11) and the corresponding pulley (5); The clutch portion (6) comprises: A rotating member (10), the rotating member (10) is transmission-connected to the transmission main shaft (3), Two magnetic beads (12) are adsorbed on the iron piece (11), and the two magnetic beads (12) are respectively located on two opposite sides of the rotating piece (10). Two grooves (13) are provided on the inner side wall of the pulley (5); The limiting structure includes a driving source (26), and the two ends of the driving source (26) are respectively connected to a first limiting part and a second limiting part. The driving source (26) simultaneously drives the first limiting part and the second limiting part to move, so as to limit the rotation of any one or two of the iron parts (11).

2. The upper and lower rail main transmission box (1) according to claim 1, characterized in that: The iron piece (11) is fixedly connected to a limiting gear (4), or the iron piece (11) is provided with a plurality of limiting teeth arranged along its circumference.

3. The upper and lower rail main transmission box (1) according to claim 2, characterized in that: The two pulleys (5) are located between the two iron pieces (11).

4. The upper and lower rail main transmission box (1) according to claim 1, characterized in that: The first limiting portion comprises a first shaft (14), an outer wall of which is provided with a first fixed tooth (18) and a third fixed tooth (20) at the same level, and a gap is provided between the first fixed tooth (18) and the third fixed tooth (20).

5. The upper and lower rail main transmission box (1) according to claim 4, characterized in that: The second limiting portion includes a second shaft (15); a second fixed tooth (19) and a fourth fixed tooth (21) of the same horizontal height are provided on the outer wall of the second shaft (15); a gap is provided between the second fixed tooth (19) and the fourth fixed tooth (21); the first fixed tooth (18) and the second fixed tooth (19) are misaligned in horizontal projection; the angular position of the third fixed tooth (20) along the circumferential direction of the first shaft (14) is consistent with the angular position of the fourth fixed tooth (21) along the circumferential direction of the second shaft (15).

6. The upper and lower rail main transmission box (1) according to claim 5, characterized in that: The driving source (26) is a dual-output shaft motor, and the two output shafts of the dual-output shaft motor are respectively connected to the first shaft body (14) and the second shaft body (15).

7. The upper and lower rail main transmission box (1) according to claim 5, characterized in that: The driving source (26) is a single-output shaft motor (9), the output shaft of the single-output shaft motor (9) is connected to one of the first shaft body (14) and the second shaft body (15), a transmission structure is connected between the first shaft body (14) and the second shaft body (15), and the first shaft body (14) and the second shaft body (15) are located on both sides of the single-output shaft motor (9).

8. The upper and lower rail main transmission box (1) according to claim 7, characterized in that: The transmission structure comprises a transmission shaft (24), a first gear (23) fixedly connected to the first shaft (14), and a fourth gear (8) fixedly connected to the second shaft (15); the first gear (23) is meshed with a second gear (25), the fourth gear (8) is meshed with a third gear (7), and the second gear (25) and the third gear (7) are both coaxially connected to the transmission shaft (24).

9. The upper and lower rail main transmission box (1) according to claim 7, characterized in that: The synchronous transmission ratio of the first shaft (14) and the second shaft (15) is 1.

10. The upper and lower rail main transmission box (1) according to claim 5, characterized in that: The first shaft (14) is connected to a first fixed disk (16), and the first fixed teeth (18) and the third fixed teeth (20) are formed on the first fixed disk (16); the second shaft (15) is connected to a second fixed disk (17), and the second fixed teeth (19) and the fourth fixed teeth (21) are formed on the second fixed disk (17).

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