Foldable auxiliary transmission case
By introducing a foldable secondary transmission box into the curtain system, the transition gear and lift seat design are used to rotate the transmission gear in a synchronous or independent state, the problem of inflexible use of the curtain system is solved and flexible control of the curtain is achieved.
Patent Information
- Application Number
- CN202422609217.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-10-29
AI Technical Summary
In the existing curtain system, the secondary transmission box cannot realize the individual or synchronous opening and closing of the curtains, resulting in inflexible use and cannot meet the needs of both controlling light and protecting privacy.
A foldable secondary transmission box is designed, and by providing transition gears and lift seats in the box, the transmission gears can rotate in a synchronous or independent state, so as to achieve synchronous or separate opening and closing of curtains.
It realizes the flexible use of the curtain system, and can synchronize or open and close the curtains on both sides according to needs, meeting the different usage needs of users.
Smart Images
Figure CN223120528U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of curtain systems, in particular to a foldable auxiliary transmission box. Background Art
[0002] Curtains are used by people to block windows to achieve sunshade and prevent the leakage of privacy inside the house. Most daily windows are three or four meters long, or even longer. If the curtain track is directly cut to the same length as the window, it is difficult to carry and transport.
[0003] To solve the above problems, some spliceable track systems have emerged on the market. The curtain track is divided into multiple sections, and the curtain track is connected to the curtain track through an auxiliary transmission box. Generally, the structure of the existing auxiliary transmission box is as described in the technical solution of the Chinese patent application No. CN2023226123731, titled "A Curtain Universal Connector with Stable Transmission", where the first connection end and the second connection end can rotate relative to each other, and the transmission gears in the first connection end and the second connection end are meshed to achieve synchronous rotation. When such a structure is used, the curtains on the curtain tracks installed on both sides of the connector open and close synchronously, and it is impossible to only open the curtain on one side of the connector while the curtain on the other side remains closed. Such a structure cannot make the curtain system only open one side of the curtain, and cannot meet the use requirements of both making the indoor light meet the use needs and protecting the privacy of local areas inside the house. It is not flexible enough to use, and it is very inconvenient for users. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a foldable auxiliary transmission box, which has the advantages of simple structure, reasonable design, synchronous opening and closing or independent opening and closing of the curtains on both sides during use, and is very flexible and convenient to use.
[0005] The technical solution of the present utility model is realized as follows: A foldable secondary transmission box includes a box body; end heads are respectively provided on the left and right sides of the box body; transmission gears are respectively rotatably installed on each end head, and the rotation axes of each transmission gear are arranged along the up and down direction; a pulley part and a linkage wheel part are formed on each transmission gear along its rotation axis; particularly, it further includes an intermediate gear and a lifting seat; the lifting seat is installed in the box body in a manner that it can be lifted up and down; the intermediate gear is rotatably installed on the lifting seat, and the rotation axis of the intermediate gear is also arranged along the up and down direction, and the rotation axis of the intermediate gear is located between the two transmission gears; the intermediate gear has two position states driven by the lifting seat, and these two position states are the upper in-place state and the lower in-place state respectively; when the intermediate gear is in one of the upper in-place state or the lower in-place state, the linkage wheel parts of each transmission gear are engaged with the intermediate gear, so that the two transmission gears rotate synchronously; when the intermediate gear is in the other of the upper in-place state or the lower in-place state, each transmission gear is separated from the intermediate gear, so that the two transmission gears rotate independently.
[0006] The intermediate gear of this solution has two position states, namely the upper in-place state and the lower in-place state, during use. When the intermediate gear is in one of the upper in-place state or the lower in-place state, the linkage wheel parts of each transmission gear are engaged with the intermediate gear, so that the two transmission gears rotate synchronously; when the intermediate gear is in the other of the upper in-place state or the lower in-place state, each transmission gear is separated from the intermediate gear, so that the two transmission gears rotate independently. When this solution is applied to a curtain system, the curtains on both sides are driven to move by the transmission gears on both sides. In this way, the user can switch the position state of the intermediate gear to make the curtains connected to both sides of this solution open and close synchronously or independently, meeting the different usage needs of the user, and it is very flexible and convenient to use.
[0007] Further, a guiding hole and an activity space are formed in the box body; the axis of the guiding hole is arranged along the up and down direction, a convex ring arranged around its axis is formed in the guiding hole, and a notch is formed in the convex ring; the guiding hole and the activity space are distributed up and down, one end of the guiding hole is communicated with the activity space, and the other end of the guiding hole is communicated with the outside; the lifting seat is formed with a control rod part and an installation part; a rotation limiting space is formed in the installation part; the intermediate gear is rotatably installed in the rotation limiting space; the installation part is located in the activity space; one end of the control rod part is connected to the installation part, and the other end of the control rod part is provided with a control end that can pass through the guiding hole and extend out of the box body; the diameter of the control end is smaller than that of the control rod part, and a convex strip arranged along the up and down direction is formed on the control end, and this convex strip is cooperatively sleeved with the notch of the convex ring.
[0008] Further, the lifting seat includes a guiding member and a clamping member; the guiding member is formed with a first limiting plate and the control lever portion, and one end of the control lever portion inside the box body is connected to the first limiting plate; the clamping member is formed with a transition rotating shaft and a second limiting plate; one end of the transition rotating shaft is connected to the second limiting plate; the transition gear is rotatably mounted on the transition rotating shaft; the clamping member is on the side of the first limiting plate facing away from the control lever portion, and the other end of the transition rotating shaft is connected to the guiding member, so that the clamping member and the first limiting plate are assembled to form the mounting portion, and the rotation limiting space is formed between the first limiting plate and the second limiting plate.
[0009] Further, an insertion hole is formed in the guiding member; the cross-section of the insertion hole includes a central portion and at least two concave positions arranged around the central portion, and the insertion hole extends from the side of the first limiting plate facing away from the control lever portion into the control lever portion; the cross-section of the transition rotating shaft is the same as that of the insertion hole, and one end of the transition rotating shaft facing away from the second limiting plate is inserted into the insertion hole of the guiding member.
[0010] Further, a guiding column portion is formed in the moving space; the central axis of the guiding column portion is collinear with the axis of the guiding hole; a guiding channel is formed on the mounting portion of the lifting seat; one end of the guiding channel communicates with the side of the mounting portion facing away from the control lever portion, and the guiding channel is sleeved on the guiding column portion.
[0011] Further, each end is rotatably mounted on the box body; the rotation axis of each end is collinear with the rotation axis of the transmission gear mounted thereon, so that the two ends can be transformed between the folded state and the unfolded state.
[0012] Further, a connecting end is formed on each end, and a transmission cavity is also formed inside each end; the pulley portion of the transmission gear on each end is inside the transmission cavity, and the linkage wheel portion of the transmission gear is outside the transmission cavity; an installation groove for inserting the end of the curtain track is formed on the end face of the connecting end of each end; a toothed belt through hole communicating the bottom of the installation groove with the transmission cavity is formed on each end.
[0013] Further, the orifice of the transmission cavity of each end is arranged in the up-down direction, and an end cover is mounted on the orifice of the transmission cavity of each end; a through hole for the linkage wheel portion to pass through is formed on the end cover; the diameter of the through hole is smaller than the diameter of the pulley portion to limit the pulley portion of the transmission gear in the transmission cavity.
[0014] Further, the box body includes a first shell and a second shell; the first shell and the second shell are distributed up and down, the first shell and the second shell are connected together, and the first shell and the second shell are assembled to form two openings; the two openings are respectively on the left and right sides of the box body; one end and one transmission gear are respectively rotatably mounted in each opening.
[0015] Furthermore, a shaft cylinder part is formed in each driving cavity of the end heads. The cylinder cavity of the shaft cylinder part communicates with the upper and lower surfaces of the end heads. The driving gears on the end heads are rotatably sleeved on the shaft cylinder parts. A first shaft body and a second shaft body are respectively arranged in each opening. The first shaft body in each opening penetrates into the shaft cylinder part of the end head therein, and the second shaft body in each opening penetrates into the driving gear from the side of the linkage wheel part of the driving gear facing away from the pulley part, so that the first shaft body and the second shaft body in each opening are butted to form a driving rotating shaft.
[0016] The beneficial effects of the utility model are as follows: it has the advantages of simple structure, reasonable design, the curtains on both sides can be opened and closed synchronously or independently during use, and it is very flexible and convenient to use. Description of the Drawings
[0017] Figure 1 Schematic perspective view of the embodiment in the folded state (the transition gear is in the lower in-place state).
[0018] Figure 2 Schematic perspective view of the embodiment in the state of being unfolded to 180° (the transition gear is in the lower in-place state).
[0019] Figure 3 Schematic bottom view of the embodiment in the state of being unfolded to 180° (the transition gear is in the lower in-place state).
[0020] Figure 4 For Figure 3 Schematic cross-sectional view taken along the line A-A in
[0021] Figure 5 Schematic perspective view of the box body of the embodiment.
[0022] Figure 6 Schematic disassembly and assembly structure view of the embodiment after flipping.
[0023] Figure 7 Schematic end face structure view of the guide part of the embodiment.
[0024] Description of reference numerals: 1 - box body; 11 - guide hole; 12 - movable space; 13 - convex ring; 14 - guide post portion; 15 - first housing; 16 - second housing; 17 - opening; 18 - first shaft body; 19 - second shaft body; 2 - end; 21 - connection end; 22 - transmission cavity; 23 - installation groove; 24 - toothed belt through hole; 25 - shaft cylinder portion; 3 - transmission gear; 31 - pulley portion; 32 - linkage wheel portion; 4 - intermediate gear; 5 - lifting seat; 51 - control lever portion; 52 - control end; 521 - rib; 53 - guide member; 54 - clamping member; 55 - first limiting plate; 56 - transition rotating shaft; 57 - second limiting plate; 58 - insertion hole; 581 - central portion; 582 - recess; 59 - guide channel; 6 - end cover; 61 - through hole. Detailed implementation manners
[0025] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6 shown, this embodiment is a foldable secondary transmission box, including a box body 1; end heads 2 are respectively arranged on the left and right sides of the box body 1; transmission gears 3 are respectively rotatably installed on each end head 2, and the rotation axes of each transmission gear 3 are all arranged along the up and down direction; each transmission gear 3 forms a pulley portion 31 and a linkage wheel portion 32 along its rotation axis, and the pulley portion 31 is used for winding and meshing with the toothed belt on the track during use, and the pulley portion 31 is located below the linkage wheel portion 32; in order to achieve the purpose of this embodiment, this embodiment further includes an intermediate gear 4 and a lifting seat 5; the lifting seat 5 is installed in the box body 1 so as to be able to move up and down; the intermediate gear 4 is rotatably installed on the lifting seat 5, and the rotation axis of the intermediate gear 4 is also arranged along the up and down direction, and the rotation axis of the intermediate gear 4 is located between the 2 transmission gears 3; the intermediate gear 4 has 2 position states driven by the lifting seat 5, and these 2 position states are respectively the upper in-place state and the lower in-place state; when the intermediate gear 4 is in the lower in-place state, the linkage wheel portions 32 of each transmission gear 3 are all meshed with the intermediate gear 4, so that the 2 transmission gears 3 rotate synchronously; when the intermediate gear 4 is in the upper in-place state, each transmission gear 3 is separated from the intermediate gear 4, so that the 2 transmission gears 3 rotate independently. When this secondary transmission box is applied to a curtain system, the curtains on both sides are driven to move by the transmission gears 3 on both sides. In this way, the user can switch the position state of the intermediate gear 4, so that the curtains connected to both sides of this secondary transmission box can be synchronously opened and closed or independently opened and closed, meeting the different usage needs of the user, and being very flexible and convenient to use.
[0026] In order to make the connection structure between the lifting seat 5 and the box body 1 more reasonable, as Figure 3 、 Figure 4 、 Figure 6As shown in the figure, a guiding hole 11 and a moving space 12 are formed in the box body 1; the axis of the guiding hole 11 is arranged in the up and down direction, a convex ring 13 arranged around its axis is formed in the guiding hole 11, and a notch (not shown in the attached drawing) communicating with its upper and lower surfaces is formed in the convex ring 13; the guiding hole 11 is located below the moving space 12, one end of the guiding hole 11 communicates with the moving space 12, and the other end of the guiding hole 11 communicates with the bottom surface of the box body 1; the lifting seat 5 is formed with a control rod part 51 and a mounting part; a rotation limiting space is formed in the mounting part; the intermediate gear 4 is rotatably mounted in the rotation limiting space; the mounting part is located in the moving space 12; one end of the control rod part 51 is connected to the mounting part, and the other end of the control rod part 51 is provided with a control end 52 that can extend out of the box body 1 through the guiding hole 11. A cross-shaped control groove for matching with a tool is formed on the end surface of the control end 52. During use, the tool is inserted into the cross-shaped control groove to drive the control rod part 51 to rotate; the diameter of the control end 52 is smaller than that of the control rod part 51, and a convex strip 521 arranged in the up and down direction is formed on the control end 52, and the convex strip 521 is sleeved in cooperation with the notch of the convex ring 13. During use, pulling the control end 52 can move the lifting seat 5 downward. When the end surface of the control rod part 51 abuts against the convex ring 13, the intermediate gear 4 reaches the lower in-place state. At this time, the intermediate gear 4 maintains the lower in-place state under its own gravity. In the lower in-place state of the intermediate gear 4, the convex strip 521 remains nested with the notch of the convex ring 13, so that the lifting seat 5 will not rotate, making the rotation of the intermediate gear 4 smoother; when it is necessary to release the lower in-place state of the intermediate gear 4, just press the control end 52 to move the lifting seat 5 upward, so that the intermediate gear 4 is completely separated from each transmission gear 3. During the upward movement of the lifting seat 5, when the convex strip 521 on the control end 52 completely passes through the notch of the convex ring 13, the control end 52 can be rotated at this time to make the convex strip 521 rotate above the convex ring 13. In this way, after releasing the control end 52, the convex ring 13 can support the convex strip 521 to prevent the lifting seat 5 from moving downward under the action of gravity, so that the intermediate gear 4 can maintain the upper in-place state. During actual production, if it is desired to obtain a structure in which when the intermediate gear is in the upper in-place state, the linkage parts of each transmission gear are all meshed with the intermediate gear, only the structure of this embodiment needs to be inverted, and the bottom end of the convex strip of the control end is spaced apart from the end surface of the control rod part. In this way, after the lifting seat is raised to make the intermediate gear reach the upper in-place state, the convex strip on the control end completely passes through the notch of the convex ring. In this way, after rotating the control end and then releasing it, the convex ring can support the convex strip, so that the intermediate gear maintains the upper in-place state.
[0027] To make the assembly structure of the lifting seat 5 and the intermediate gear 4 more convenient, such as Figure 3 、 Figure 4 、 Figure 6As shown, the lifting seat 5 includes a guiding member 53 and a clamping member 54; the guiding member 53 is formed with a first limiting plate 55 and the control lever portion 51, and one end of the control lever portion 51 inside the box body 1 is connected to the first limiting plate 55; the clamping member 54 is formed with a transition rotating shaft 56 and a second limiting plate 57; one end of the transition rotating shaft 56 is connected to the second limiting plate 57; the transition gear 4 is rotatably mounted on the transition rotating shaft 56; the clamping member 54 is on the side of the first limiting plate 55 facing away from the control lever portion 51, and the other end of the transition rotating shaft 56 is connected to the guiding member 53, so that the clamping member 54 and the first limiting plate 55 are assembled to form the mounting portion, and the rotation limiting space is formed between the first limiting plate 55 and the second limiting plate 57.
[0028] In order to make the assembly structure between the guiding member 53 and the clamping member 54 more reasonable, as Figure 3 、 Figure 4 、 Figure 6 、 Figure 7 shown, an insertion hole 58 is formed on the guiding member 53; the cross-section of the insertion hole 58 includes a central portion 581 and three concave positions 582 arranged around the central portion 581, and the insertion hole 58 extends from the side of the first limiting plate 55 facing away from the control lever portion 51 into the control lever portion 51; the cross-section of the transition rotating shaft 56 is the same as the cross-section of the insertion hole 58, and one end of the transition rotating shaft 56 facing away from the second limiting plate 57 is inserted into the insertion hole 58 of the guiding member 53. Such a structure makes the transition rotating shaft 56 unable to rotate relative to the guiding member 53, and in actual application, the transition rotating shaft 56 and the insertion hole 58 can also be fixed together by adhesive or interference fit.
[0029] In order to make the stability of the transition gear 4 better during rotation, as Figure 3 、 Figure 4 、 Figure 6 shown, a guiding column portion 14 is formed in the moving space 12; the central axis of the guiding column portion 14 is collinear with the hole axis of the guiding hole 11; a guiding channel 59 is formed on the mounting portion of the lifting seat 5, and the guiding channel 59 is specifically arranged on the clamping member 54; one end of the guiding channel 59 communicates with the side of the mounting portion facing away from the control lever portion 51, and the guiding channel 59 is sleeved on the guiding column portion 14. This can not only improve the stability of the transition gear 4 during rotation, but also prevent the lifting seat 4 from being easily broken when the transition gear 4 is working, making the structural strength of this secondary transmission box higher.
[0030] In order to make this secondary transmission box suitable for use on angled windows, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 6As shown, each end 2 is rotatably mounted on the box body 1; the rotation axis of each end 2 is collinear with the rotation axis of the transmission gear 3 mounted thereon, so that the two ends 2 can be transformed between a folded state and an unfolded state.
[0031] To make the structure of the end 2 more reasonable, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 shown, a connection end 21 is formed on each end 2, and a transmission cavity 22 is also formed inside each end 2; the pulley part 31 of the transmission gear 3 on each end 2 is located inside the transmission cavity 22, and the linkage wheel part 32 of the transmission gear 3 is located outside the transmission cavity 22; an installation groove 23 for inserting the end of the curtain track is formed on the end face of the connection end 21 of each end 2; a toothed belt through hole 24 communicating the bottom of the installation groove 23 with the transmission cavity 22 is formed on each end 2, and generally there are two toothed belt through holes 24 on each end 2, which are respectively for the toothed belt to penetrate into and out of the transmission cavity 22.
[0032] To make the assembly of the end 2 and the transmission gear 3 more convenient, as Figure 3 , Figure 4 , Figure 6 shown, the orifice of the transmission cavity 22 of each end 2 is located on the top surface of the end 2, and an end cover 6 is mounted on the orifice of the transmission cavity 22 of each end 2, and the end cover 6 is mounted on the end 2 through a snap structure; a through hole 61 for the linkage wheel part 32 to pass through is formed on the end cover 6; the diameter of the through hole 61 is smaller than the diameter of the pulley part 31 to limit the pulley part 31 of the transmission gear 3 inside the transmission cavity 22.
[0033] To make the structure of the box body 1 more reasonable, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 shown, the box body 1 includes a first shell 15 and a second shell 16; the first shell 15 is of a T-shaped structure, and the guiding hole 11 is formed on the first shell 15, the second shell 16 is of a straight-shaped structure, and the guiding column part 14 is formed inside the second shell 16; the first shell 15 is located below the second shell 16, the first shell 15 is connected to the second shell 16, the first shell 15 and the second shell 16 are assembled to form the activity space 12, and the first shell 15 and the second shell 16 are assembled to form two openings 17; the two openings 17 are respectively located on the left and right sides of the box body 1; one end 2 and one transmission gear 3 are rotatably mounted in each opening 17.
[0034] To make the structure of each end 2 and the transmission gear 3 mounted on the box body 1 more reasonable, as Figure 3 , Figure 4, Figure 5 As shown, a shaft cylinder portion 25 is respectively formed in the transmission cavity 22 of each end 2. The cylinder cavity of the shaft cylinder portion 25 communicates with the upper and lower surfaces of the end 2. The transmission gear 3 on the end 2 is rotatably sleeved on the shaft cylinder portion 25. A first shaft body 18 and a second shaft body 19 are respectively arranged in each opening 17. The first shaft body 18 is located on the first housing 15, and the second shaft body 19 is located on the second housing 16. The first shaft body 18 in each opening 17 is inserted into the shaft cylinder portion 25 of the end 2 therein, and the second shaft body 19 in each opening 17 penetrates into the transmission gear 3 from the side of the linkage wheel portion 32 of the transmission gear 3 facing away from the pulley portion 31, so that the first shaft body 18 and the second shaft body 19 in each opening 17 are butted to form a transmission rotating shaft.
Claims
1. A foldable auxiliary transmission case, comprising a case body; end heads are respectively arranged on the left and right sides of the case body; transmission gears are respectively and rotatably installed on the end heads, and the rotation axes of the transmission gears are all arranged in the up and down direction; belt wheel parts and linkage wheel parts are formed on each transmission gear along its rotation axis; it is characterized in that: It further includes an intermediate gear and a lifting seat; the lifting seat is installed in the box body so as to be able to move up and down; the intermediate gear is rotatably installed on the lifting seat, the rotation axis of the intermediate gear is also arranged in the up-and-down direction, and the rotation axis of the intermediate gear is located between two driving gears; the intermediate gear is driven by the lifting seat to have two position states, and these two position states are the upper in-place state and the lower in-place state respectively; when the intermediate gear is in one of the upper in-place state or the lower in-place state, the linkage wheel parts of the driving gears are all meshed with the intermediate gear, so that the two driving gears rotate synchronously; when the intermediate gear is in the other of the upper in-place state or the lower in-place state, each driving gear is separated from the intermediate gear, so that the two driving gears rotate independently of each other.
2. The collapsible auxiliary transmission case according to claim 1, wherein: A guiding hole and an activity space are formed in the box body; the axis of the guiding hole is arranged in the up-and-down direction, a convex ring arranged around its axis is formed in the guiding hole, and a notch is formed in the convex ring; the guiding hole and the activity space are distributed up and down, one end of the guiding hole is communicated with the activity space, and the other end of the guiding hole is communicated with the outside; the lifting seat is formed with a control rod part and an installation part; a rotation limiting space is formed in the installation part; the intermediate gear is rotatably installed in the rotation limiting space; the installation part is located in the activity space; one end of the control rod part is connected with the installation part, and the other end of the control rod part is provided with a control end that can extend out of the box body through the guiding hole; the diameter of the control end is smaller than that of the control rod part, and a convex strip arranged in the up-and-down direction is formed on the control end, and the convex strip is fitted and sleeved with the notch of the convex ring.
3. The collapsible auxiliary transmission case according to claim 2, characterized in that: The lifting seat includes a guiding part and a clamping part; the guiding part is formed with a first limiting plate and the control rod part, and one end of the control rod part in the box body is connected with the first limiting plate; the clamping part is formed with an intermediate rotating shaft and a second limiting plate; one end of the intermediate rotating shaft is connected with the second limiting plate; the intermediate gear is rotatably installed on the intermediate rotating shaft; the clamping part is located on the side of the first limiting plate facing away from the control rod part, and the other end of the intermediate rotating shaft is connected with the guiding part, so that the clamping part and the first limiting plate are assembled to form the installation part, and the rotation limiting space is formed between the first limiting plate and the second limiting plate.
4. The collapsible auxiliary transmission case according to claim 3, wherein: An insertion hole is formed in the guiding part; the cross section of the insertion hole includes a central part and at least two concave positions arranged around the central part, and the insertion hole extends from the side of the first limiting plate facing away from the control rod part into the control rod part; the cross section of the intermediate rotating shaft is the same as that of the insertion hole, and one end of the intermediate rotating shaft facing away from the second limiting plate is inserted into the insertion hole of the guiding part.
5. The collapsible auxiliary transmission case according to claim 2, characterized in that: A guiding column part is formed in the activity space; the central axis of the guiding column part is collinear with the axis of the guiding hole; a guiding channel is formed on the installation part of the lifting seat; one end of the guiding channel is communicated with the side of the installation part facing away from the control rod part, and the guiding channel is sleeved on the guiding column part.
6. A foldable auxiliary transmission case according to claim 1, characterized in that: Each end is rotatably installed on the box body; the rotation axis of each end is collinear with the rotation axis of the driving gear installed thereon, so that the two ends can be changed between the folded state and the unfolded state.
7. A foldable auxiliary transmission case according to claim 6, characterized in that: Connection ends are formed on each end head, and transmission cavities are also formed inside each end head; the pulley parts of the transmission gears on each end head are located inside the transmission cavities, and the linkage wheel parts of the transmission gears are located outside the transmission cavities; mounting grooves for inserting the ends of the curtain tracks are formed on the end faces of the connection ends of each end head; tooth belt through holes communicating the bottom of the mounting groove with the transmission cavity are respectively formed on each end head.
8. A foldable auxiliary transmission case according to claim 7, characterized in that: The openings of the transmission cavities of each end head are arranged in the up and down direction, and end covers are installed on the openings of the transmission cavities of each end head; through holes for the linkage wheel parts to pass through are formed on the end covers; the diameter of the through holes is smaller than the diameter of the pulley parts, so as to limit the pulley parts of the transmission gears inside the transmission cavities.
9. A foldable auxiliary transmission case according to claim 8, characterized in that: The box body includes a first shell and a second shell; the first shell and the second shell are distributed up and down, the first shell and the second shell are connected together, and the first shell and the second shell are assembled to form two openings; the two openings are respectively located on the left and right sides of the box body; one end head and one transmission gear are respectively rotatably installed in each opening.
10. A foldable auxiliary transmission case according to claim 9, characterized in that: Axle tube parts are respectively formed inside the transmission cavities of each end head, the tube cavities of the axle tube parts communicate with the upper and lower surfaces of the end heads, and the transmission gears on the end heads are rotatably sleeved on the axle tube parts; a first shaft body and a second shaft body are respectively arranged in each opening; the first shaft body in each opening passes through the axle tube part of the end head therein, and the second shaft body in each opening penetrates into the transmission gear from the side of the linkage wheel part of the transmission gear therein facing away from the pulley part, so that the first shaft body and the second shaft body in each opening are butted to form a transmission rotating shaft.