WO2021007709A1 - 窗帘拉绳收放装置及其传动机构 - Google Patents

窗帘拉绳收放装置及其传动机构 Download PDF

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Publication number
WO2021007709A1
WO2021007709A1 PCT/CN2019/095794 CN2019095794W WO2021007709A1 WO 2021007709 A1 WO2021007709 A1 WO 2021007709A1 CN 2019095794 W CN2019095794 W CN 2019095794W WO 2021007709 A1 WO2021007709 A1 WO 2021007709A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
reel
curtain
transmission mechanism
retracting device
Prior art date
Application number
PCT/CN2019/095794
Other languages
English (en)
French (fr)
Inventor
雷振邦
雷兴邦
Original Assignee
东莞市雷富溢窗饰科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 东莞市雷富溢窗饰科技有限公司 filed Critical 东莞市雷富溢窗饰科技有限公司
Priority to PCT/CN2019/095794 priority Critical patent/WO2021007709A1/zh
Priority to US17/426,639 priority patent/US20220120133A1/en
Publication of WO2021007709A1 publication Critical patent/WO2021007709A1/zh

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • E06B9/26—Lamellar or like blinds, e.g. venetian blinds
    • E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
    • E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
    • E06B9/32—Operating, guiding, or securing devices therefor
    • E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • E06B9/26—Lamellar or like blinds, e.g. venetian blinds
    • E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
    • E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
    • E06B9/32—Operating, guiding, or securing devices therefor
    • E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
    • E06B2009/3222—Cordless, i.e. user interface without cords
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • E06B9/26—Lamellar or like blinds, e.g. venetian blinds
    • E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
    • E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
    • E06B9/32—Operating, guiding, or securing devices therefor
    • E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
    • E06B2009/3225—Arrangements to aid the winding of cords rollers

Definitions

  • the embodiments of the present application relate to the technical field of curtains, and in particular to a curtain cord retracting device and its transmission mechanism.
  • the drawstring connected with the curtain is wound on the reel, and the reel can be rotated by the driving device, so that the drawstring is wound on or released from the reel Come out, so as to realize the lifting of the curtain.
  • Some curtain driving devices use flat spiral springs to provide driving force.
  • the torque change trend of traditional flat spiral springs is to meet the changing trend of the weight that the curtain driving device needs to support.
  • After the reed of the flat spiral spring is bent and formed
  • the forming radius of curvature gradually increases from the inner ring to the outer ring, and the smaller the forming radius of curvature of the reed, the greater the torque that can be provided.
  • the production of this flat scroll spring is complicated to manufacture and the cost is also high.
  • the technical problem to be solved by the embodiments of the present application is to provide a transmission structure of a curtain rope retracting device, which has low cost and can effectively save effort when pulling the rope.
  • a further technical problem to be solved by the embodiments of the present application is to provide a curtain draw cord retracting device, which has low cost and can effectively save effort when pulling the draw cord.
  • the technical problem to be solved by the embodiments of the present application is to provide a transmission structure of a curtain rope retracting device, which has low cost and can effectively save effort when pulling the rope.
  • a further technical problem to be solved by the embodiments of the present application is to provide a curtain draw cord retracting device, which has low cost and can effectively save effort when pulling the draw cord.
  • a transmission mechanism of a curtain rope retracting device for driving between the power mechanism and the winding wheel of the curtain rope retracting device The reel rotates, the transmission mechanism includes two external gears with the same structure and meshing with each other, the center distance of the two external gears is a fixed value, and one of the two external gears is drivingly connected with the output shaft of the power mechanism.
  • the external gear is a non-circular gear and the radius of curvature of the pitch line gradually increases, the tooth corresponding to the node with the smallest radius of curvature on the pitch line and the node with the largest radius of curvature on the pitch line Corresponding gear teeth transition through curved surfaces.
  • a central hole is opened in the middle of each external gear, the inner wall of the central hole is formed into an internal gear, and the sun gear and planetary gear set are assembled in the central hole.
  • the rotation axis of the sun gear and the The rotation axis of the external gear coincides, each planetary gear of the planetary gear set meshes with the sun gear and the internal gear, and the sun gear installed in the middle of one of the external gears and the output shaft of the power mechanism
  • the sun gear installed in the middle of the other external gear is fixedly connected with the reel.
  • the central hole is equipped with a first partition that divides the central hole into multiple accommodating spaces in the axial direction, and a sun gear and a corresponding planetary gear set are installed in each accommodating space.
  • each first partition is fixed integrally with a sun gear and the center of each first partition is provided with a through hole penetrating the first partition and the sun gear, and the first partition is also provided with Planetary gear shafts, each planetary gear shaft is correspondingly installed with the planetary gears, and one end of the output shaft and the reel protrudes from a core shaft correspondingly inserted into the central hole and correspondingly passed through the through hole ,
  • the sun gear is fixed at the root of the mandrel.
  • an embodiment of the present application also provides a curtain draw cord retracting device, including a reel on which the draw cord is wound, a power mechanism, and a transmission between the power mechanism and the reel to drive The reel is rotated correspondingly to retract and retract the transmission mechanism of the rope, and the transmission mechanism is the transmission mechanism described in any one of the above.
  • the power mechanism includes a spring winding disk and an output shaft whose central axes are arranged parallel to each other, and a flat scroll wound on the spring winding disk and having an outer end fixed to the outer surface of the output shaft. spring.
  • the flat scroll spring is a flat scroll spring with a constant output torque.
  • the curtain draw cord retracting device further includes a housing, the winding wheel, the power mechanism and the transmission mechanism are all installed in the housing, and the side of the housing is provided with a through hole for the draw cord to pass through.
  • a plurality of wire rods for positioning and guiding the drawstring are also arranged inside the housing.
  • the housing is also provided with a positioning hole, the center of one end of the reel protrudes from a pivot shaft, and the reel is pivotally connected to the housing by the pivot shaft and the positioning hole.
  • the spring winding disk is also pivoted on the pivot shaft.
  • the reel is provided with two wire grooves
  • the opposite ends of the housing are each provided with a through hole for the pull rope to pass through
  • the inner side of the housing is opposite to the two ends at both ends.
  • the position of the perforation is also assembled with a second partition that divides the perforation into two layers of channels, and the drawstrings respectively penetrated from the two ends of the shell are inserted into the shell from the channels of different layers of the corresponding perforation and guided by the wire column. Then it is wound onto different grooves on the reel.
  • the embodiment of the application uses two external gears with the same structure and meshing with each other for transmission between the power mechanism and the reel.
  • the center distance of the two external gears is a fixed value and one of the two is connected to the output shaft of the power mechanism and the other is connected to the reel. Since the center distance of the two external gears is fixed, the two external gears It is a non-circular gear and the radius of curvature of the pitch line gradually increases. The distance between the meshing point of the two external gears and the respective center of rotation will change at any time, and it will be when the distance between the meshing point of an external gear and the center of rotation gradually increases.
  • Fig. 1 is a schematic diagram of an exploded state of an alternative embodiment of the curtain draw cord retracting device of the present application.
  • Fig. 2 is a schematic diagram of the combined state of an alternative embodiment of the curtain cord retracting device of the present application.
  • Fig. 3 is a schematic cross-sectional view of an alternative embodiment of the curtain cord retracting device of the present application along the longitudinal axis after the cover is removed.
  • FIG. 4 is a schematic cross-sectional structure view of an alternative embodiment of the transmission mechanism of the curtain draw cord retracting device of the present application along the end surface of the planetary gear.
  • Fig. 5 is a schematic structural diagram of a first partition plate of an alternative embodiment of the curtain rope driving device of the present application.
  • the embodiment of the present application provides a transmission mechanism 1 of a curtain rope retracting device for transmission between the power mechanism 3 and the reel 5 of the curtain rope retracting device
  • the transmission mechanism 1 includes two external gears 10 with the same structure and meshing with each other.
  • the center distance of the two external gears 10 is a fixed value, and one of the two external gears 10 is connected to the power mechanism.
  • the output shaft 30 of 3 is in transmission connection and the other is in transmission connection with the winding wheel 5.
  • the external gear 10 is a non-circular gear and the radius of curvature of the pitch line gradually increases.
  • the tooth 101 and the gear tooth 101 corresponding to the node with the largest radius of curvature on the pitch line are connected by curved surfaces.
  • two external gears 10 with the same structure and meshing with each other are used for transmission between the power mechanism 3 and the reel 5.
  • the center distance of the two external gears 10 is a fixed value and one of the two It is connected in transmission with the output shaft 30 of the power mechanism 3 and the other is connected in transmission with the reel 5. Since the center distance of the two external gears 10 is a fixed value, the two external gears 10 are non-circular gears and have pitch lines.
  • the radius of curvature of the two external gears 10 gradually increases, and the distance between the meshing point of the two external gears 10 and the respective rotation centers will change at any time, and when the distance between the meshing point of one external gear 10 and the rotation center gradually increases, the other external gear
  • the transmission ratio of the two external gears 10 will gradually change as the rope 7 is retracted on the reel 5, so that The torque transmitted from the power mechanism 3 to the winding wheel 5 can better match the pulling force required during the lifting and lowering of the curtain fabric, which can effectively achieve the effect of saving effort; and the use of curved surface transition can make the tooth profile of the external gear 10 formed A complete circle facilitates the effective meshing transmission of the two external gears 10.
  • a central hole 12 is further opened in the middle of each external gear 10, the inner wall of the central hole 12 is formed as an internal gear 14, and the central hole 12 is assembled with a sun gear 16 and Planetary gear set 18, the rotation axis of the sun gear 16 coincides with the rotation axis of the external gear 10, and each planet gear 181 of the planetary gear set 18 meshes with the sun gear 16 and the internal gear 14 respectively ,
  • the sun gear 16 installed in the middle of one of the external gears 10 is fixedly connected to the output shaft 30 of the power mechanism 3, and the sun gear 16 installed in the middle of the other external gear 10 is fixedly connected to the reel 5 .
  • the external gear 10 can rotate less and the reel 5 can rotate correspondingly more. Make the retracting operation of the rope more labor-saving and convenient.
  • the central hole 12 is equipped with a first partition 121 that divides the central hole 12 into multiple accommodating spaces in the axial direction, and a first partition 121 is installed in each accommodating space.
  • multiple sun gears 16 and planetary gear sets 18 are provided, which can provide more stable supporting force and transmission force.
  • each first partition 121 is fixed integrally with a sun gear 16, and the center of each first partition 121 is provided with a penetrating first partition 121 and a sun gear.
  • the through hole 123 of the gear 16 the first partition 121 is also provided with a planetary gear shaft 125, each planetary gear shaft 125 is correspondingly installed with the planetary gear 181, the output shaft 30 and the reel 5
  • the first partition 121 is provided, and each planetary gear 181 and the sun gear 16 are conveniently installed through the spindle 50 and the planetary gear shaft 125 of each partition 121.
  • the embodiment of the present application also provides a curtain draw cord retracting device, including a reel 5 on which the draw cord 7 is wound, a power mechanism 3, and the power mechanism 3 and the reel 5
  • the transmission mechanism 1 is a transmission mechanism 1 that drives the reel 5 to rotate correspondingly and retracts and retracts the rope 7.
  • the transmission mechanism 1 is a transmission mechanism as described in any one of the foregoing.
  • the power mechanism 3 includes a spring winding disk 32 and an output shaft 30 whose central axes are arranged parallel to each other, and are wound on the spring winding disk 32 and the outer end is also fixed to The flat spiral spring 34 on the outer surface of the output shaft 30.
  • a flat scroll spring 34 is used and arranged in parallel with the output shaft 30, and the flat scroll spring 34 is used as a power component to drive the output shaft 30 to rotate.
  • the planar scroll spring 34 is a planar scroll spring with a constant output torque. Since the two external gears 10 can realize the real-time change of the transmission ratio, the flat scroll spring 34 with a constant output torque can be used in this embodiment to achieve a smooth and labor-saving pulling of the rope 7, which can effectively reduce The cost of the flat spiral spring 34.
  • the curtain draw cord retracting device further includes a housing 9.
  • the reel 5, the power mechanism 3, and the transmission mechanism 1 are all installed in the housing 9.
  • the side of the housing 9 is provided with a through hole 90 for the pull cord 7 to pass through, and a plurality of wire posts 92 for positioning and guiding the pull cord 7 are also provided inside the housing 9.
  • all the components are installed in the housing 9 to simplify the installation structure, and the perforation 90 and the wire post 92 are provided to prevent interference between the pull rope 7 and the components, and the pulling is more smooth.
  • the housing 9 is further provided with a positioning hole 94, the center of one end of the reel 5 protrudes from a pivot shaft 52, and the reel 5 is pivotally connected
  • the shaft 52 is pivotally connected to the housing 9 in cooperation with the positioning hole 94, and the spring winding plate 32 is also pivoted on the pivot shaft 52.
  • the pivotal shaft 52 is matched with the positioning hole 94 to simplify the installation structure of the winding wheel 5 and the spring winding disk 32 in the housing 9, optimize the layout, and reduce the occupied volume.
  • the reel 5 is provided with two wire grooves 54 and the opposite ends of the housing 9 are provided with a perforation 90 for the drawstring 7 to pass through.
  • a second partition 96 that divides the perforation 90 into two layers of channels is also assembled at the positions on the inner side of the housing 9 that are opposite to the perforation 90 at both ends. 7 is to penetrate into the housing 9 from different layers of channels corresponding to the perforations and are guided by the wire rod 92 to be wound onto different wire grooves 54 on the reel 5.
  • the shell is composed of a bottom shell 97 and a cover 98 buckled on the bottom shell 97. The bottom shell 97 and the cover 98 cooperate to form the perforation 90 to facilitate the assembly of various structures.
  • the second partition 96 is used to divide the perforation 90 into two layers, and the movement space of the drawstring 7 is divided into two layers to prevent the drawstrings 7 located in the two grooves 54 of the reel 5 from interfering with each other.
  • the working principle of the curtain rope retracting device is as follows: when the curtain needs to cover the window, by pulling the curtain downwards, the rope 7 will be driven out from the reel 5 and drive the winding The reel 5 rotates, and then the transmission is carried out in turn to rotate the sun gear 16, the planetary gear set 18, the internal gear 14 and the external gear 10 corresponding to the reel 5, and the meshing of the two external gears 10 The power is transmitted to another external gear 10 installed corresponding to the output shaft 30 of the power mechanism 3, and then the internal gear 14, the planetary gear set 18, and the sun gear 16 installed in the other external gear 10 are rotated in turn to turn the power Transmitted to the output shaft 30 of the power mechanism 3, the planar scroll spring 34 is gradually wound on the output shaft 30 to gradually accumulate elastic potential energy.
  • the embodiment of the application uses two external gears with the same structure and meshing with each other for transmission between the power mechanism and the reel.
  • the center distance of the two external gears is a fixed value and one of the two is connected to the output shaft of the power mechanism and the other is connected to the reel. Since the center distance of the two external gears is fixed, the two external gears It is a non-circular gear and the radius of curvature of the pitch line gradually increases. The distance between the meshing point of the two external gears and the respective center of rotation will change at any time, and it will be when the distance between the meshing point of an external gear and the center of rotation gradually increases.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Curtains And Furnishings For Windows Or Doors (AREA)

Abstract

一种窗帘拉绳收放装置及其传动机构(1)，窗帘拉绳收放装置包括供拉绳(7)卷绕于其上的绕线轮(5)、动力机构(3)以及在动力机构(3)和绕线轮(5)之间传动以带动绕线轮(5)相应旋转而收放拉绳(7)的传动机构(1)，传动机构(1)包括结构相同且相互啮合的两个外齿轮(10)，两个外齿轮(10)的中心距为定值且两者中的一个与动力机构(3)的输出轴(30)传动连接而另一个与绕线轮(5)传动连接，外齿轮(10)为非圆齿轮且节线的曲率半径逐渐增大，节线上曲率半径最小的节点对应的轮齿(101)与节线上曲率半径最大的节点对应的轮齿(101)之间以曲面衔接过渡。通过采用两个结构相同且为非圆齿轮的外齿轮(10)在动力机构(3)和绕线轮(5)之间进行传动，能使动力机构(3)传递到绕线轮(5)上的扭矩更好的与帘布升降过程中所需拉力相匹配，有效省力。

Description

窗帘拉绳收放装置及其传动机构 技术领域
本申请实施例涉及窗帘技术领域，尤其涉及一种窗帘拉绳收放装置及其传动机构。
 背景技术
在拉绳窗帘中，与帘布相连接的拉绳绕设于绕线轮上，绕线轮可在驱动装置驱动下旋转，而使拉绳被绕至绕线轮上或从绕线轮上释放出来，从而实现帘布的升降。
一些窗帘驱动装置采用平面涡卷弹簧来提供驱动力，传统平面涡卷弹簧的扭矩的变化趋势为满足与窗帘驱动装置需要支撑的重量的变化趋势适配，平面涡卷弹簧的簧片弯曲成型后的成型曲率半径是由内圈向外圈逐渐增大，而簧片的成型曲率半径越小，所能提供的扭矩越大。但是这种平面涡卷弹簧在生产时，制作复杂，成本也较高。
 技术问题
本申请实施例所要解决的技术问题在于，提供一种窗帘拉绳收放装置的传动结构，成本较低，能在拉动拉绳时有效省力。
本申请实施例进一步所要解决的技术问题在于，提供一种窗帘拉绳收放装置，成本较低，能在拉动拉绳时有效省力。
 技术解决方案
本申请实施例所要解决的技术问题在于，提供一种窗帘拉绳收放装置的传动结构，成本较低，能在拉动拉绳时有效省力。
本申请实施例进一步所要解决的技术问题在于，提供一种窗帘拉绳收放装置，成本较低，能在拉动拉绳时有效省力。
为了解决上述技术问题，本申请实施例提供以下技术方案：一种窗帘拉绳收放装置的传动机构，用于在所述窗帘拉绳收放装置的动力机构和绕线轮之间传动以带动绕线轮旋转，所述传动机构包括结构相同且相互啮合的两个外齿轮，所述两个外齿轮的中心距为定值且两者中的一个与所述动力机构的输出轴传动连接而另一个与所述绕线轮传动连接，所述外齿轮为非圆齿轮且节线的曲率半径逐渐增大，节线上曲率半径最小的节点对应的轮齿与节线上曲率半径最大的节点对应的轮齿之间以曲面衔接过渡。
进一步的，每个所述外齿轮中部还开设有中心孔，所述中心孔的内壁成型为内齿轮，所述中心孔内组装有太阳齿轮和行星齿轮组，所述太阳齿轮的旋转轴线和所述外齿轮的旋转轴线重合，所述行星齿轮组的每个行星齿轮均分别与所述太阳齿轮和内齿轮相啮合，其中一个外齿轮中部安装的所述太阳齿轮与所述动力机构的输出轴固定连接，而另一个外齿轮中部安装的所述太阳齿轮与所述绕线轮固定连接。
进一步的，所述中心孔内装设有将所述中心孔沿轴向分隔为多层收容空间的第一隔板，每一层收容空间内均安装有一个太阳齿轮和对应的一行星齿轮组。
进一步的，每个第一隔板均与一个太阳齿轮固定一体且各第一隔板的中心设有贯穿第一隔板和太阳齿轮的通孔，所述第一隔板上还凸出设置有行星齿轮轴，各行星齿轮轴上对应安装有所述行星齿轮，所述输出轴及绕线轮的一端均凸伸出一根对应插入所述中心孔并对应穿过所述通孔的芯轴，所述芯轴的根部固定有一个所述太阳齿轮。
另一方面，本申请实施例还提供一种窗帘拉绳收放装置，包括供拉绳卷绕于其上的绕线轮、动力机构以及在所述动力机构和绕线轮之间传动以带动绕线轮相应旋转而收放拉绳的传动机构，所述传动机构为如上述任一项所述的传动机构。
进一步的，所述动力机构包括中轴线相互平行设置的弹簧卷绕盘和输出轴以及卷绕于所述弹簧卷绕盘上且外端部还固定至所述输出轴外侧面上的平面涡卷弹簧。
进一步的，所述平面涡卷弹簧为输出扭矩为恒定值的平面涡卷弹簧。
进一步的，所述窗帘拉绳收放装置还包括壳体，所述绕线轮、动力机构和传动机构均安装于所述壳体内，所述壳体的侧面开设有供拉绳穿过的穿孔，所述壳体内部还设置有多个用于定位和引导拉绳的导线柱。
进一步的，所述壳体上还设置有定位孔，所述绕线轮的一端中心伸出枢接轴，所述绕线轮以所述枢接轴与所述定位孔配合枢接于壳体上，所述弹簧卷绕盘也枢设于所述枢接轴上。
进一步的，所述绕线轮设有两个线槽，所述壳体的相对两端各设有一个供拉绳穿过的穿孔，且在所述壳体内侧靠两端处正对所述穿孔的位置处还组装有将所述穿孔分为两层通道的第二隔板，分别从壳体两端穿入的拉绳是从对应穿孔的不同层通道穿入壳体内并经导线柱引导后卷绕至所述绕线轮上不同的线槽上。
 有益效果
采用上述技术方案后，本申请实施例至少具有如下有益效果：本申请实施例通过采用两个结构相同且相互啮合的两个外齿轮在动力机构和绕线轮之间进行传动，两个外齿轮的中心距为定值且两者中的一个与所述动力机构的输出轴传动连接而另一个与所述绕线轮传动连接，由于两个外齿轮的中心距为定值，两个外齿轮又是非圆齿轮且节线的曲率半径逐渐增大，两个外齿轮的啮合点与各自旋转中心的距离会随时发生变化，而且会是一个外齿轮的啮合点与旋转中心的距离逐渐增大时，另一个外齿轮的啮合点与旋转中心的距离必然逐渐减小时，反之亦然，由此，两个外齿轮的传动比会随拉绳在绕线轮上收放而相应随之逐渐变化，从而能使动力机构传递到绕线轮上的扭矩更好地与窗帘的帘布升降过程中所需拉力相匹配，有效达到省力的效果；而采用曲面衔接过渡可使外齿轮的齿廓形成完整的一圈，方便两个外齿轮能有效的啮合传动。
 附图说明
图1为本申请窗帘拉绳收放装置一个可选实施例的分解状态示意图。
图2为本申请窗帘拉绳收放装置一个可选实施例的组合状态示意图。
图3为本申请窗帘拉绳收放装置一个可选实施例拆除罩壳后沿长度方向中轴面的剖面示意图。
图4为本申请窗帘拉绳收放装置的传动机构一个可选实施例沿行星齿轮的端面的剖面结构示意图。
图5为本申请窗帘拉绳驱动装置一个可选实施例第一隔板的结构示意图。
本申请的实施方式
下面结合附图和具体实施例对本申请作进一步详细说明。应当理解，以下的示意性实施例及说明仅用来解释本申请，并不作为对本申请的限定，而且，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互结合。
如图1-图4所示，本申请实施例提供一种窗帘拉绳收放装置的传动机构1，用于在所述窗帘拉绳收放装置的动力机构3和绕线轮5之间传动以带动绕线轮5旋转，所述传动机构1包括结构相同且相互啮合的两个外齿轮10，所述两个外齿轮10的中心距为定值且两者中的一个与所述动力机构3的输出轴30传动连接而另一个与所述绕线轮5传动连接，所述外齿轮10为非圆齿轮且节线的曲率半径逐渐增大，节线上曲率半径最小的节点对应的轮齿101与节线上曲率半径最大的节点对应的轮齿101之间以曲面衔接过渡。
本申请实施例通过采用两个结构相同且相互啮合的两个外齿轮10在动力机构3和绕线轮5之间进行传动，两个外齿轮10的中心距为定值且两者中的一个与所述动力机构3的输出轴30传动连接而另一个与所述绕线轮5传动连接，由于两个外齿轮10的中心距为定值，两个外齿轮10又是非圆齿轮且节线的曲率半径逐渐增大，两个外齿轮10的啮合点与各自旋转中心的距离会随时发生变化，而且会是一个外齿轮10的啮合点与旋转中心的距离逐渐增大时，另一个外齿轮10的啮合点与旋转中心的距离必然逐渐减小时，反之亦然，由此，两个外齿轮10的传动比会随拉绳7在绕线轮5上收放而相应随之逐渐变化，从而使动力机构3传递到绕线轮5上的扭矩能更好地与窗帘的帘布升降过程中所需拉力相匹配，有效达到省力的效果；而采用曲面衔接过渡可使外齿轮10的齿廓形成完整的一圈，方便两个外齿轮10能有效的啮合传动。
在本申请一个可选实施例中，每个所述外齿轮10中部还开设有中心孔12，所述中心孔12的内壁成型为内齿轮14，所述中心孔12内组装有太阳齿轮16和行星齿轮组18，所述太阳齿轮16的旋转轴线和所述外齿轮10的旋转轴线重合，所述行星齿轮组18的每个行星齿轮181均分别与所述太阳齿轮16和内齿轮14相啮合，其中一个外齿轮10中部安装的所述太阳齿轮16与所述动力机构3的输出轴30固定连接，而另一个外齿轮10中部安装的所述太阳齿轮16与所述绕线轮5固定连接。本实施例通过设置内齿轮14、太阳齿轮16和行星齿轮组18，并可通过设置具体的传动比，可使得外齿轮10旋转较少圈数而绕线轮5能对应旋转较多圈数，使拉绳的收放操作更加省力便捷。
在本申请一个可选实施例中，所述中心孔12内装设有将所述中心孔12沿轴向分隔为多层收容空间的第一隔板121，每一层收容空间内均安装有一个太阳齿轮16和对应的一行星齿轮组18。本实施例设置多个太阳齿轮16和行星齿轮组18，可以提供更加稳定的支撑力和传动力。
在本申请一个可选实施例中，如图5所示，每个第一隔板121均与一个太阳齿轮16固定一体且各第一隔板121的中心设有贯穿第一隔板121和太阳齿轮16的通孔123，所述第一隔板121上还凸出设置有行星齿轮轴125，各行星齿轮轴125上对应安装有所述行星齿轮181，所述输出轴30及绕线轮5的一端均凸伸出一根对应插入所述中心孔12并对应穿过所述通孔123的芯轴50，所述芯轴50的根部固定有一个所述太阳齿轮16。本实施例通过设置第一隔板121，通过芯轴50和各个隔板121的行星齿轮轴125，方便安装各个行星齿轮181和太阳齿轮16。
另一方面，本申请实施例还提供一种窗帘拉绳收放装置，包括供拉绳7卷绕于其上的绕线轮5、动力机构3以及在所述动力机构3和绕线轮5之间传动以带动绕线轮5相应旋转而收放拉绳7的传动机构1，所述传动机构1为如权上述任一项所述的传动机构。
在本申请一个可选实施例中，所述动力机构3包括中轴线相互平行设置的弹簧卷绕盘32和输出轴30以及卷绕于所述弹簧卷绕盘32上且外端部还固定至所述输出轴30外侧面上的平面涡卷弹簧34。本实施例通过采用平面涡卷弹簧34且与输出轴30轴向平行设置，由平面涡卷弹簧34作为动力件来驱动输出轴30旋转，安装方便，所提供的驱动力的可控性强，从而可以更好地设计拉绳7在收放时所需的驱动力，而且整体结构简单，方便组装且易于操控。
在本申请一个可选实施例中，所述平面涡卷弹簧34为输出扭矩为恒定值的平面涡卷弹簧。由于两个外齿轮10可实现传动比的实时变化，而使得在本实施例中可采用输出扭矩为恒定值的平面涡卷弹簧34即可实现拉绳7的平稳且省力的拉动，可有效降低平面涡卷弹簧34的成本。
在本申请一个可选实施例中，所述窗帘拉绳收放装置还包括壳体9，所述绕线轮5、动力机构3和传动机构1均安装于所述壳体9内，所述壳体9的侧面开设有供拉绳7穿过的穿孔90，所述壳体9内部还设置有多个用于定位和引导拉绳7的导线柱92。本实施例将各个构件均安装至壳体9内，简化安装结构，并通过设置穿孔90和导线柱92，防止拉绳7与各个构件之间的干扰，拉动更加顺畅。
在本申请一个可选实施例中，所述壳体9上还设置有定位孔94，所述绕线轮5的一端中心伸出枢接轴52，所述绕线轮5以所述枢接轴52与所述定位孔94配合枢接于壳体9上，所述弹簧卷绕盘32也枢设于所述枢接轴52上。本实施例通过枢接轴52与定位孔94配合，简化壳体9内绕线轮5和弹簧卷绕盘32的安装结构，优化布局，减小占用体积。
在本申请一个可选实施例中，所述绕线轮5设有两个线槽54，所述壳体9的相对两端各设有一个供拉绳7穿过的穿孔90，且在所述壳体9内侧靠两端处正对所述穿孔90的位置处还组装有将所述穿孔90分为两层通道的第二隔板96，分别从壳体9两端穿入的拉绳7是从对应穿孔的不同层通道穿入壳体9内并经导线柱92引导后卷绕至所述绕线轮5上不同的线槽54上。在具体实施时，所述壳体由底壳97和扣合在底壳97上的罩壳98组成，底壳97和罩壳98配合形成所述穿孔90，方便各个结构的组装。本实施例采用第二隔板96将穿孔90分为两层，将拉绳7的运动空间分为两层，防止位于绕线轮5的两个线槽54内的拉绳7相互干扰。
本申请实施例提供的窗帘拉绳收放装置在实际应用时的工作原理如下：当窗帘需要遮蔽窗户时，通过向下拉动帘布，即会带动拉绳7从绕线轮5上放出并带动绕线轮5旋转，由此再依次传动使对应于绕线轮5安装的太阳齿轮16、行星齿轮组18、内齿轮14和外齿轮10随之旋转，进而通过两个外齿轮10的啮合而将动力传递至对应于动力机构3的输出轴30安装的另一个外齿轮10，随后再依次传动使另一个外齿轮10内部装设的内齿轮14、行星齿轮组18、太阳齿轮16旋转而将动力传递至动力机构3的输出轴30，使平面涡卷弹簧34逐渐绕设至输出轴30上而逐步积蓄弹性势能，通过合理的传动比设计，可以达到外齿轮10旋转一圈即可使帘布在完全收拢状态（完全不遮蔽窗户）与完全展开（完全遮蔽窗户）状态之间完全转变的效果，而且帘布拉动到位后而会因为受力平衡而停止在任意高度位置。而需要再次打开窗帘时，只需略微对施加帘布向上的力，打破帘布原来的受力平衡状态，平面涡卷弹簧34即会回绕至弹簧卷绕盘32上，同时释放扭矩，通过传动机构1的传动而带动绕线轮5收卷拉绳7。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，这些均属于本申请的保护范围之内。
 工业实用性
采用上述技术方案后，本申请实施例至少具有如下有益效果：本申请实施例通过采用两个结构相同且相互啮合的两个外齿轮在动力机构和绕线轮之间进行传动，两个外齿轮的中心距为定值且两者中的一个与所述动力机构的输出轴传动连接而另一个与所述绕线轮传动连接，由于两个外齿轮的中心距为定值，两个外齿轮又是非圆齿轮且节线的曲率半径逐渐增大，两个外齿轮的啮合点与各自旋转中心的距离会随时发生变化，而且会是一个外齿轮的啮合点与旋转中心的距离逐渐增大时，另一个外齿轮的啮合点与旋转中心的距离必然逐渐减小时，反之亦然，由此，两个外齿轮的传动比会随拉绳在绕线轮上收放而相应随之逐渐变化，从而能使动力机构传递到绕线轮上的扭矩更好地与窗帘的帘布升降过程中所需拉力相匹配，有效达到省力的效果；而采用曲面衔接过渡可使外齿轮的齿廓形成完整的一圈，方便两个外齿轮能有效的啮合传动。

Claims (10)

  1. 一种窗帘拉绳收放装置的传动机构，用于在所述窗帘拉绳收放装置的动力机构和绕线轮之间传动以带动绕线轮旋转，其特征在于，所述传动机构包括结构相同且相互啮合的两个外齿轮，所述两个外齿轮的中心距为定值且两者中的一个与所述动力机构的输出轴传动连接而另一个与所述绕线轮传动连接，所述外齿轮为非圆齿轮且节线的曲率半径逐渐增大，节线上曲率半径最小的节点对应的轮齿与节线上曲率半径最大的节点对应的轮齿之间以曲面衔接过渡。
  2. 如权利要求1所述的窗帘拉绳收放装置的传动机构，其特征在于，每个所述外齿轮中部还开设有中心孔，所述中心孔的内壁成型为内齿轮，所述中心孔内组装有太阳齿轮和行星齿轮组，所述太阳齿轮的旋转轴线和所述外齿轮的旋转轴线重合，所述行星齿轮组的每个行星齿轮均分别与所述太阳齿轮和内齿轮相啮合，其中一个外齿轮中部安装的所述太阳齿轮与所述动力机构的输出轴固定连接，而另一个外齿轮中部安装的所述太阳齿轮与所述绕线轮固定连接。
  3. 如权利要求2所述的窗帘拉绳收放装置的传动机构，其特征在于，所述中心孔内装设有将所述中心孔沿轴向分隔为多层收容空间的第一隔板，每一层收容空间内均安装有一个太阳齿轮和对应的一行星齿轮组。
  4. 如权利要求3所述的窗帘拉绳收放装置的传动机构，其特征在于，每个第一隔板均与一个太阳齿轮固定一体且各第一隔板的中心设有贯穿第一隔板和太阳齿轮的通孔，所述第一隔板上还凸出设置有行星齿轮轴，各行星齿轮轴上对应安装有所述行星齿轮，所述输出轴及绕线轮的一端均凸伸出一根对应插入所述中心孔并对应穿过所述通孔的芯轴，所述芯轴的根部固定有一个所述太阳齿轮。
  5. 一种窗帘拉绳收放装置，包括供拉绳卷绕于其上的绕线轮、动力机构以及在所述动力机构和绕线轮之间传动以带动绕线轮相应旋转而收放拉绳的传动机构，其特征在于，所述传动机构为如权利要求1-4中任一项所述的传动机构。
  6. 如权利要求5所述的窗帘拉绳收放装置，其特征在于，所述动力机构包括中轴线相互平行设置的弹簧卷绕盘和输出轴以及卷绕于所述弹簧卷绕盘上且外端部还固定至所述输出轴外侧面上的平面涡卷弹簧。
  7. 如权利要求6所述的窗帘拉绳收放装置，其特征在于，所述平面涡卷弹簧为输出扭矩为恒定值的平面涡卷弹簧。
  8. 如权利要求6所述的窗帘拉绳收放装置，其特征在于，所述窗帘拉绳收放装置还包括壳体，所述绕线轮、动力机构和传动机构均安装于所述壳体内，所述壳体的侧面开设有供拉绳穿过的穿孔，所述壳体内部还设置有多个用于定位和引导拉绳的导线柱。
  9. 如权利要求8所述的窗帘拉绳收放装置，其特征在于，所述壳体上还设置有定位孔，所述绕线轮的一端中心伸出枢接轴，所述绕线轮以所述枢接轴与所述定位孔配合枢接于壳体上，所述弹簧卷绕盘也枢设于所述枢接轴上。
  10. 如权利要求8或9所述的窗帘拉绳收放装置，其特征在于，所述绕线轮设有两个线槽，所述壳体的相对两端各设有一个供拉绳穿过的穿孔，且在所述壳体内侧靠两端处正对所述穿孔的位置处还组装有将所述穿孔分为两层通道的第二隔板，分别从壳体两端穿入的拉绳是从对应穿孔的不同层通道穿入壳体内并经导线柱引导后卷绕至所述绕线轮上不同的线槽上。
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