WO2022183880A1 - 同步机构和折叠终端 - Google Patents

同步机构和折叠终端 Download PDF

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Publication number
WO2022183880A1
WO2022183880A1 PCT/CN2022/075014 CN2022075014W WO2022183880A1 WO 2022183880 A1 WO2022183880 A1 WO 2022183880A1 CN 2022075014 W CN2022075014 W CN 2022075014W WO 2022183880 A1 WO2022183880 A1 WO 2022183880A1
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WO
WIPO (PCT)
Prior art keywords
worm
base
rotating
worm gear
rotating member
Prior art date
Application number
PCT/CN2022/075014
Other languages
English (en)
French (fr)
Inventor
付振彪
张垚磊
李海飞
高明谦
严斌
周国统
Original Assignee
荣耀终端有限公司
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 荣耀终端有限公司 filed Critical 荣耀终端有限公司
Priority to EP22738529.1A priority Critical patent/EP4080858A4/en
Publication of WO2022183880A1 publication Critical patent/WO2022183880A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
    • H04M1/0208—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings characterized by the relative motions of the body parts
    • H04M1/0214—Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • H04M1/0216—Foldable in one direction, i.e. using a one degree of freedom hinge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0206—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings
    • H04M1/0208—Portable telephones comprising a plurality of mechanically joined movable body parts, e.g. hinged housings characterized by the relative motions of the body parts
    • H04M1/0214—Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
    • H04M1/0216—Foldable in one direction, i.e. using a one degree of freedom hinge
    • H04M1/022—The hinge comprising two parallel pivoting axes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1675—Miscellaneous details related to the relative movement between the different enclosures or enclosure parts
    • G06F1/1681—Details related solely to hinges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
    • H04M1/0268—Details of the structure or mounting of specific components for a display module assembly including a flexible display panel
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1615—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function
    • G06F1/1616—Constructional details or arrangements for portable computers with several enclosures having relative motions, each enclosure supporting at least one I/O or computing function with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position

Definitions

  • the present application relates to the technical field of electronic devices, and in particular, to a synchronization mechanism and a folding terminal.
  • the basic structure of the folding terminal is a base, two bodies and a flexible screen covering the two bodies, and the two bodies can rotate synchronously with respect to the base.
  • the thickness of the body is also larger, which is not conducive to the lightweight design of the folding terminal.
  • the embodiment of the present application provides a synchronization mechanism and a folding terminal.
  • the synchronization mechanism adopts a first worm, a worm wheel and a second worm as a transmission mechanism between the first rotating part and the second rotating part, which can realize the first rotating part and the second rotating part.
  • the synchronous rotation of the second rotating member, and when the synchronizing mechanism is applied in the folding terminal, is beneficial to the lightweight and thin design of the folding terminal.
  • the technical solutions of the synchronization mechanism and the folding terminal are as follows:
  • a synchronization mechanism in a first aspect, includes a base, a worm gear, a first worm, a second worm, a first rotating part and a second rotating part.
  • the worm wheel, the first worm and the second worm are all rotatably connected to the base, and the first worm and the second worm are parallel and meshed with the worm wheel.
  • the first rotating member is fixedly connected with the first worm
  • the second rotating member is fixedly connected with the second worm.
  • the worm wheel, the first worm, and the second worm are configured to rotate the first rotating member and the second rotating member synchronously with respect to the base.
  • the synchronization mechanism provided in the embodiment of the present application can be applied to any device that needs to be rotated synchronously, for example, in a folding terminal, but is not limited thereto.
  • the base is used for installing the worm gear, the first worm and the second worm.
  • the worm wheel, the first worm and the second worm constitute a transmission mechanism between the first rotating part and the second rotating part, so that the first rotating part and the second rotating part rotate synchronously.
  • the types of the worm gear, the first worm, and the second worm are not limited in the embodiment of the present application.
  • the first worm and the second worm may be a cylindrical worm, a toroidal worm, or a conical worm.
  • the first rotating part is fixedly connected with the first worm
  • the second rotating part is fixedly connected with the second worm. Due to the existence of the worm wheel, the first worm and the second worm, when the first rotating part and the second rotating part rotate relative to the base, they must be rotated synchronously.
  • the first rotating part rotates.
  • the rotating part drives the first worm to rotate
  • the first worm drives the worm wheel to rotate
  • the worm wheel drives the second worm to rotate
  • the second worm drives the second rotating part to rotate (the same is true when the second rotating part rotates), thus realizing the first rotating part. and the synchronous rotation of the second rotating member relative to the base.
  • the synchronizing mechanism provided in the embodiment of the present application is applied in the folding terminal, since the axial direction of the worm wheel, the radial direction of the first worm and the second worm are consistent with the thickness direction of the body, and the axial dimension of the worm wheel, the first The radial dimensions of the worm and the second worm are both small, so the synchronizing mechanism will not cause the thickness of the body to be too large, which is beneficial to the light and thin design of the folding terminal.
  • the worm gear includes a worm gear main body part and a rotating shaft part.
  • the rotating shaft portion is coaxially and fixedly connected with the worm gear main body portion, and both ends of the rotating shaft portion protrude relative to both sides of the worm gear main body portion. Both ends of the rotating shaft portion are respectively rotatably connected with the base.
  • the base includes a base and a shaft cover, and the base and the shaft cover are fixedly connected.
  • the main part of the worm gear is located between the base and the shaft cover, and both ends of the rotating shaft part are rotatably connected to the base and the shaft cover, respectively.
  • the side of the main body of the worm gear facing the shaft cover has an annular groove, the annular groove is coaxial with the shaft portion, and the side of the shaft cover facing the main body of the worm gear has an annular protrusion
  • the annular flange is located in the annular groove.
  • annular groove is provided on the main body of the worm gear, an annular flange is arranged on the shaft cover, and the annular flange is located in the annular groove, so that one side of the worm gear is cleaned.
  • Axial limit is Moreover, this limiting method further saves the thickness space of the body under the condition of ensuring the minimum thickness of the shaft cover.
  • a side of the main body of the worm gear facing the base has a boss, the boss is coaxial with the shaft portion, and the side of the base facing the main body of the worm has a boss.
  • a limit groove, the boss is located in the limit groove.
  • the main body of the worm gear has an annular groove on the side facing the shaft cover, in order to avoid further weakening the strength of the worm gear, and the thickness of the base is generally thick, it can be used in One side of the main body of the worm gear facing the base is provided with a boss, and a limiting groove is set on the base to limit the axial position of the other side of the worm gear.
  • the first worm and the second worm each include a first rotational connection portion, a spiral portion, a non-circular shaft portion and a second rotational connection portion that are connected in sequence.
  • the first rotating connecting part and the second rotating connecting part are respectively connected with the base in rotation, the helical part is engaged with the worm gear, and the non-circular shaft part is connected with the first rotating part or the other part.
  • the second rotating part is fixedly connected.
  • the helix angles of the worm gear, the first worm and the second worm are greater than a first angle threshold and less than a second angle threshold, so that the synchronization mechanism is in the first working condition, In the second working condition and the third working condition, both the first rotating member and the second rotating member can rotate synchronously with respect to the base.
  • the first working condition is a working condition in which the first rotating member and the second rotating member are simultaneously rotated by a driving force
  • the second working condition is that the base is not fixed, and the first rotating member is One of the component and the second rotating component is fixed, and the other is rotated by the driving force
  • the third working condition is that the base is fixed, and the first rotating component and the second rotating component Any one of the conditions under which the driving force rotates.
  • the transmission mechanism since the worm gear acts as the driving element to drive the first worm or the second worm on the transmission route of the first worm, the worm wheel and the second worm, the transmission mechanism may self-lock. This phenomenon causes the transmission route to be interrupted, and the intuitive consequence is that when the user drives the first rotating part or the second rotating part alone, the entire synchronizing mechanism is stuck.
  • the first rotating part and the second rotating part are simultaneously rotated by the driving force.
  • the worm gear only rotates as a driven member, so self-locking will not occur.
  • the base In the second working condition, the base is not fixed, one of the first rotating part and the second rotating part is fixed, and the other is rotated by the driving force.
  • the first rotating part drives the first worm to rotate
  • the first worm drives the worm wheel to rotate.
  • the second rotating part Since the second rotating part is fixed, the worm wheel cannot drive the second worm to rotate. , but will drive the base to rotate around the second worm while autobiography, thereby also realizing the synchronous rotation of the first rotating part and the second rotating part relative to the base. Since the worm gear revolves around the worm in the second working condition, self-locking may occur.
  • the base is fixed, and any one of the first rotating part and the second rotating part is rotated by the driving force.
  • the first rotating part drives the first worm to rotate
  • the first worm drives the worm wheel to rotate
  • the worm wheel drives the second worm to rotate
  • the second worm drives the second rotating part to rotate, thus realizing the first Synchronous rotation of a rotating member and a second rotating member relative to the base. Since the worm gear drives the worm in the third working condition, a self-locking phenomenon may occur.
  • the helix angles of the first worm, the worm gear and the second worm are limited between the first angle threshold and the second angle threshold, Therefore, under any working conditions, the synchronizing mechanism can realize the synchronous rotation of the first rotating part and the second rotating part relative to the base.
  • the first angle threshold is 8.63°
  • the second angle threshold is 78.67°
  • the helix angles of the worm gear, the first worm and the second worm are greater than a third angle threshold and less than the second angle threshold, so that in the first working condition, In the second working condition and the third working condition, the driving force when the first rotating member or the second rotating member rotates is less than a preset value, such as 5N, wherein the third angle threshold is greater than the first angle threshold.
  • the helix angles of the worm gear, the first worm and the second worm can also be limited to the third angle threshold and the second angle. Between the threshold values, the driving force when the user drives the first rotating member or the second rotating member to rotate is less than a preset value, such as 5N.
  • the third angle threshold is 17.01°.
  • a folding terminal in a second aspect, includes a first body, a second body, a flexible screen, and the synchronization mechanism according to any one of the first aspects.
  • the first body and the second body are respectively connected with the first rotating part and the second rotating part in the synchronizing mechanism.
  • the flexible screen covers the first body and the second body.
  • the folding terminal provided in the embodiment of the present application may be a folding mobile phone, a folding tablet, or a folding notebook, but is not limited thereto.
  • the axes of the first worms in the plurality of synchronizing mechanisms are all collinear, and the axes of the second worms in the plurality of synchronizing mechanisms are all collinear.
  • the first rotating parts in the plurality of synchronizing mechanisms are all connected with the first body, and the second rotating parts in the plurality of synchronizing mechanisms are all connected with the second body.
  • the transmission between the first body and the second body is made more stable.
  • the folding terminal may include two synchronizing mechanisms, and the two synchronizing mechanisms share a base, the base may be in the shape of a long strip, and the two synchronizing mechanisms are arranged along the length direction of the base, and are respectively close to the base. both ends of .
  • An embodiment of the present application provides a synchronization mechanism
  • the synchronization mechanism includes a base, a worm gear, a first worm, a second worm, a first rotating part and a second rotating part, and the first rotating part and the second rotating part pass through The first worm, the worm wheel and the second worm which are engaged in sequence are connected in a driving manner.
  • the first rotating part rotates
  • the first rotating part drives the first worm to rotate
  • the first worm drives the worm wheel to rotate
  • the worm wheel drives the second worm to rotate
  • the second worm drives the second rotating part to rotate, so that the first rotating part and the Synchronous rotation of the second rotating member relative to the base.
  • the synchronizing mechanism when the synchronizing mechanism is applied in the folding terminal, since the axial direction of the worm wheel, the radial direction of the first worm and the second worm are consistent with the thickness direction of the body, and the axial dimension of the worm wheel, the diameter of the first worm and the second worm are consistent.
  • the radial size is small, so the thickness of the body will not be too large, which is beneficial to the lightweight design of the folding terminal.
  • FIG. 1 is a schematic diagram of a folding terminal and a synchronization mechanism provided by an embodiment of the present application
  • FIG. 2 is a schematic diagram of a synchronization mechanism provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a folding terminal provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a worm gear provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the installation of a worm gear provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a worm gear provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of the installation of a worm gear provided by an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a worm provided by an embodiment of the present application.
  • FIG. 9 is an exploded view of a folding terminal provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a synchronization mechanism provided in an embodiment of the present application in a first working condition
  • FIG. 11 is a schematic diagram of a synchronization mechanism provided in an embodiment of the present application in a second working condition
  • FIG. 12 is a schematic diagram of a synchronization mechanism provided in an embodiment of the present application in a third working condition
  • FIG. 13 is a schematic diagram of a worm force analysis provided by an embodiment of the present application.
  • FIG. 14 is a schematic diagram of a worm force analysis provided by an embodiment of the present application.
  • FIG. 15 is a schematic diagram of a synchronization mechanism provided by an embodiment of the present application.
  • Base 11, Base, 111, Limit groove, 12, Shaft cover, 121, Ring flange, 13, First worm shaft seat, 14, Second worm shaft seat, 15, End cover;
  • Worm gear 21, main body of worm gear, 211, annular groove, 212, boss, 22, shaft;
  • the embodiments of the present application provide a synchronization mechanism, which can be applied in a folding terminal without occupying a large thickness space of the body, which is beneficial to the lightweight design of the folding terminal.
  • FIG. 1 a schematic diagram of a folding terminal including a synchronization mechanism provided by an embodiment of the present application is shown.
  • the two sides of the synchronization mechanism are respectively connected to two bodies of the folding terminal, so that the two bodies can be unfolded and folded synchronously. rise.
  • the synchronization mechanism provided in the embodiment of the present application can also be applied to any other device that needs to be rotated synchronously, and is not limited to a folding terminal.
  • the synchronization mechanism includes a base 1 , a worm wheel 2 , a first worm 3 , a second worm 4 , a first rotating member 5 and a second rotating member 6 .
  • the worm wheel 2 , the first worm 3 and the second worm 4 are all rotatably connected with the base 1 .
  • the first worm 3 and the second worm 4 are parallel and meshed with the worm wheel 2 .
  • the first rotating member 5 is fixedly connected with the first worm 3
  • the second rotating member 6 is fixedly connected with the second worm 4 .
  • the worm wheel 2 , the first worm 3 and the second worm 4 are configured to rotate the first rotating member 5 and the second rotating member 6 synchronously with respect to the base 1 .
  • the base 1 is used to install the worm wheel 2 , the first worm 3 and the second worm 4 .
  • the worm wheel 2 , the first worm 3 and the second worm 4 constitute a transmission mechanism between the first rotating part 5 and the second rotating part 6 , so that the first rotating part 5 and the second rotating part 6 rotate synchronously.
  • the types of the worm wheel 2 , the first worm 3 and the second worm 4 are not limited in the embodiment of the present application.
  • the first worm 3 and the second worm 4 may be cylindrical worms, toroidal worms or conical worms.
  • the first rotating member 5 is fixedly connected with the first worm 3
  • the second rotating member 6 is fixedly connected with the second worm 4 . Due to the existence of the worm wheel 2 , the first worm 3 and the second worm 4 , when the first rotating part 5 and the second rotating part 6 rotate relative to the base 1 , they must rotate synchronously. As shown in FIG. 1, when the synchronization mechanism is applied in the folding terminal, the first rotating part 5 in the synchronization mechanism is connected with the first body 7 of the folding terminal, and the second rotating part 6 is connected with the second body 8, so that the first The body 7 and the second body 8 can rotate synchronously with respect to the base 1 .
  • the worm wheel 2 and the second worm 4 meshing with each other as the transmission mechanism between the first rotating part 5 and the second rotating part 6, when the first rotating part When 5 rotates, the first rotating part 5 drives the first worm 3 to rotate, the first worm 3 drives the worm wheel 2 to rotate, the worm wheel 2 drives the second worm 4 to rotate, and the second worm 4 drives the second rotating part 6 to rotate (when the second rotates The same is true when the part 6 rotates), so that the synchronous rotation of the first rotating part 5 and the second rotating part 6 relative to the base 1 is realized.
  • the axial direction of the worm wheel 2 when the synchronization mechanism provided in the embodiment of the present application is applied in the folding terminal, the axial direction of the worm wheel 2, the radial direction of the first worm 3 and the second worm 4 are consistent with the thickness direction of the body, and the axial direction of the worm wheel 2 is consistent with the thickness direction of the body.
  • the dimensions and the radial dimensions of the first worm 3 and the second worm 4 are all small, so the synchronizing mechanism provided in the embodiment of the present application will not cause the thickness of the body to be too large, which is beneficial to the lightweight design of the folding terminal.
  • the Z-direction (the thickness direction when the folding terminal is unfolded, that is, the direction corresponding to L1 in That is, the space in the direction corresponding to L2 in FIG. 3 is less tight, while the space in the Y direction (the length direction of the folded terminal) is relatively sufficient.
  • the folding terminal in the related art adopts four gears that mesh with each other as a transmission mechanism, so that the two bodies rotate synchronously.
  • the Z dimension of the folding terminal occupied by the transmission mechanism is at least the radial dimension of one gear
  • the X dimension of the occupied folding terminal is the sum of the radial dimensions of the four gears
  • the Y dimension of the occupied folding terminal is the axis of the gear.
  • Direction dimension (or thickness of gear) Since the radial dimension of the gear is relatively large and the axial dimension is relatively small, the transmission mechanism in the related art occupies relatively large Z-direction space and X-direction space, and saves useless Y-direction space.
  • the synchronization mechanism provided in the embodiment of the present application adopts a transmission mechanism of double worms + worm gears.
  • the Z dimension of the folding terminal occupied by the transmission mechanism of double worms + worm gears is L1 in FIG.
  • the X dimension is L2 in Figure 3
  • the Y dimension of the occupied folding terminal is the axial dimension of the worm. Since the axial dimension of the worm wheel 2 and the radial dimension of the first worm 3 and the second worm 4 are all small, L1 and L2 are both small, and the synchronizing mechanism occupies a small Z-direction space and X-direction space, which is beneficial to Thin and light design of the folding terminal.
  • the worm wheel 2 is used to transmit motion between the first worm 3 and the second worm 4 , and play a role of synchronizing the rotation of the first worm 3 and the second worm 4 .
  • the structure and installation method of the worm gear 2 provided in the embodiment of the present application will be exemplarily described below with reference to FIGS. 4 to 8 :
  • the worm wheel 2 includes a worm wheel main body portion 21 and a rotating shaft portion 22 .
  • the rotating shaft portion 22 is coaxially and fixedly connected to the worm gear main body portion 21 , and both ends of the rotating shaft portion 22 protrude relative to both sides of the worm gear main body portion 21 . Both ends of the rotating shaft portion 22 are respectively rotatably connected with the base 1 .
  • the worm gear 2 provided in the embodiment of the present application may be integrally formed.
  • the miniaturized design of the worm gear 2 is facilitated, and the space occupied by the worm gear 2 is more advantageously saved.
  • the base 1 may include a base 11 and a shaft cover 12 , and the base 11 and the shaft cover 12 are fixedly connected.
  • the main body part 21 of the worm gear is located between the base 11 and the shaft cover 12 , and two ends of the rotating shaft part 22 are rotatably connected to the base 11 and the shaft cover 12 respectively.
  • two opposite sides of the base 11 and the shaft cover 12 are respectively provided with rotating shaft holes, and both ends of the rotating shaft portion 22 are respectively located in the two rotating shaft holes.
  • the side of the worm gear main body 21 facing the shaft cover 12 has an annular groove 211 , the annular groove 211 is coaxial with the rotating shaft part 22 , and the shaft cover 12 faces the side of the worm gear main body 21 .
  • the annular flange 121 is arranged on the shaft cover 12, and the annular flange 121 is located in the annular groove 211, and the side of the worm wheel 2 facing the shaft cover 12 Axial limit is applied.
  • this limiting method further saves the thickness space of the body under the condition of ensuring the minimum thickness of the shaft cover 12 .
  • a groove can also be provided on the shaft cover 12
  • a protrusion can be provided on the side of the worm gear main body 21 facing the shaft cover 12 and the groove and the protrusion can be matched to carry out Limit, which is not limited in this embodiment of the present application.
  • the side of the worm gear main body 21 facing the base 11 has a boss 212 , the boss 212 is coaxial with the rotating shaft part 22 , and the base 11 has a limit groove 111 on the side facing the worm gear main body 21 , The boss 212 is located in the limiting groove 111 .
  • the worm gear main body 21 has an annular groove 211 on the side facing the shaft cover 12, in order to avoid further weakening the strength of the worm gear 2, and the base 11 is generally thick, the worm gear main body 21 can face the base.
  • a boss 212 is provided on one side of 11 , a limit groove 111 is set on the base 11 , and the boss 212 is located in the limit groove 111 to limit the axial position of the worm gear 2 toward the base 11 .
  • Both the first worm 3 and the second worm 4 mesh with the worm wheel 2. Under the action of the worm wheel 2, the first worm 3 and the second worm 4 rotate synchronously, and drive the first rotating part 5 and the second rotating part 6 to rotate synchronously.
  • both the first worm 3 and the second worm 4 include a first rotating connecting portion 31 , a helical portion 32 , a non-circular shaft portion 33 and a second rotating connecting portion 34 that are connected in sequence.
  • the first rotating connecting part 31 and the second rotating connecting part 34 are respectively connected with the base 1 in rotation;
  • the non-circular shaft portion 33 refers to a shaft segment with a non-circular cross-sectional shape. By setting the non-circular shaft portion 33, the circumferential limit of the first worm 3 and the first rotating member 5 is facilitated, as well as the second worm 4. Circumferential limit with the second rotating member 6 .
  • the fixed connection method between the first worm 3 and the first rotating member 5 may be the same as the fixed connection method between the second worm 4 and the second rotating member 6 .
  • the fixed connection mode of the first worm 3 and the first rotating member 5 is taken as an example to illustrate:
  • the first rotating member 5 can be sleeved on the non-circular shaft portion 33 of the first worm 3, and the corresponding through holes of the first rotating member 5 are matched with the shape of the non-circular shaft portion 33, so that the first rotating member 5 and the non-circular shaft portion 33 are matched with each other.
  • the shaped shaft portion 33 is formed and connected, and the first rotating member 5 is fixed in the circumferential direction on the first worm 3 .
  • One end of the first rotating part 5 is pressed against one side of the helical part 32 , and the limit of the other end can be realized by a retaining ring, so that the first rotating part 5 is axially fixed on the first worm 3 .
  • the base 1 is used to install the worm wheel 2 , the first worm 3 and the second worm 4 , and there may be various specific implementation manners, which are not limited in the embodiments of the present application. Below, the base 1 is exemplarily described with reference to FIG. 9 :
  • the base 1 includes a base 11 , a shaft cover 12 , a first worm shaft seat 13 , a second worm shaft seat 14 and an end cover 15 .
  • the base 11 and the shaft cover 12 are fixedly connected, the worm gear main body 21 of the worm gear 2 is located between the base 11 and the shaft cover 12 , and the two ends of the rotating shaft part 22 of the worm gear 2 are rotatably connected to the shaft cover 12 and the base 11 respectively.
  • the first worm shaft seat 13 and the second worm shaft seat 14 are both fixed on the base 11 , the first rotating connecting portion 31 of the first worm 3 and the second worm 4 is rotatably connected with the first worm shaft seat 13 , the first worm 3 The second rotational connection portion 32 of the second worm 4 is rotationally connected to the second worm shaft seat 14 .
  • the end cap 15 is fixed to the end of the base 11 for sealing the end of the base 11 .
  • the synchronizing mechanism When the synchronizing mechanism is used in the folding terminal, multiple synchronizing mechanisms can be used. As shown in FIG. 9, the multiple synchronizing mechanisms can share the same base 11, and there are multiple worm gears 2, first worms 3 and second worms 4.
  • the cover 12 , the first worm shaft seat 13 and the second worm shaft seat 14 are also plural.
  • the synchronization mechanism provided in the embodiment of the present application adopts the first worm 3 , the worm wheel 2 and the second worm 4 as the transmission mechanism, so that the first rotating part 5 and the second rotating part 6 rotate synchronously.
  • the worm wheel 2 acts as the driving element to drive the first worm 3 or the second worm 4, so the transmission mechanism may be self-locking. , causing the transmission route to be interrupted, and the intuitive consequence is that when the first rotating part 5 or the second rotating part 6 is driven alone, the entire synchronizing mechanism is stuck.
  • the embodiment of the present application limits the helix angle of the first worm 3 and the second worm 4 to be between the first angle threshold and the second angle threshold, so that under any working conditions, the first Both the rotating member 5 and the second rotating member 6 can rotate synchronously with respect to the base 1 .
  • the first rotating part 5 and the second rotating part 6 are rotated by the driving force at the same time (the user can drive the first rotating part 5 and the second rotating part 5 and the second rotating part 5 through the first body 7 and the second body 8 respectively).
  • Rotating part 6 rotates).
  • the worm gear 2 only rotates as a driven member, so the self-locking phenomenon will not occur.
  • the base 1 is not fixed, one of the first rotating part 5 and the second rotating part 6 is fixed, and the other is rotated by the driving force.
  • the first rotating member 5 drives the first worm 3 to rotate
  • the first worm 3 drives the worm wheel 2 to rotate.
  • the worm wheel 2 cannot drive the second worm 4 to rotate, but drives the base 1 to rotate around the second worm 4 while it is self-propagating, thereby realizing the synchronization of the first rotating part 5 and the second rotating part 6 relative to the base 1 turn.
  • the intuitive expression of the synchronization mechanism in the second working condition is that the base 1 is driven to rotate around the second rotating member 6 while the first rotating member 5 is rotating.
  • the base 1 is fixed, and any one of the first rotating member 5 and the second rotating member 6 is rotated by the driving force.
  • the first rotating member 5 drives the first worm 3 to rotate
  • the first worm 3 drives the worm wheel 2 to rotate
  • the worm wheel 2 drives the second worm 4 to rotate
  • the second worm 4 drives the second worm to rotate.
  • the rotating member 6 rotates, thereby realizing the synchronous rotation of the first rotating member 5 and the second rotating member 6 relative to the base 1 .
  • the friction coefficient ⁇ of the metal material selected by the worm gear 2 is between 0.15-0.2
  • the ⁇ is substituted into the above two formulas to obtain 8.53 ° ⁇ ⁇ 78.67 ° , that is, the first angle
  • the threshold is 8.53° and the second angle threshold is 78.67°.
  • the helix angle of the worm gear 2, the first worm 3 and the second worm 4 can be adjusted. Further defined (defined between the third angle threshold and the second angle threshold). Since the driving force that the user needs to apply is the largest under the third working condition, the force analysis of the synchronous mechanism under the third working condition is carried out:
  • the force analysis is as follows, where p is the driving force applied by the user, l is the moment length of the first rotating part 5 or the second rotating part 6, ⁇ is the transmission efficiency of the worm gear, and R is the worm gear
  • the index circle radius, r is the index circle radius of the first worm 3 or the second worm 4, ⁇ is the friction coefficient, and ⁇ is the helix angle.
  • T is the measured resistance, substitute G 2 -g>T as Reduce to
  • the driving force that the user needs to apply is the largest under the third working condition, under the premise that the driving force applied by the user under the third working condition is less than 5N, the user under the first working condition and the second working condition The applied driving force is also less than 5N.
  • the worm wheel 2, the first worm 3 and the second worm 4 adopt a helix angle structure of greater than 17.01° and less than 78°, which can realize any rotation of the synchronization mechanism under the above three working conditions. , and is conducive to increasing the transmission efficiency and improving the user experience.
  • the helix angle used in the embodiments of the present application may be 25°
  • the first worm 3 and the second worm 4 may be three-headed worms, but not limited to this, for example, they may also be Single-ended worm or double-ended worm.
  • the above only takes the worm wheel 2 as a cylindrical worm wheel, and the first worm 3 and the second worm 4 as a cylindrical worm as an example to illustrate the synchronization mechanism.
  • the worm gear 2 can also be a conical worm gear or a toroidal worm gear, and the first worm 3 and the second worm 4 can also be a conical worm or a toroidal worm.
  • the worm gear 2 in the synchronization mechanism adopts a conical worm gear
  • the gear teeth of the worm gear 2 are located on the end face of the worm gear 2
  • the first worm 2 and the second worm 3 adopt a conical worm
  • the gear teeth on the end face mesh.
  • the Z dimension of the occupied folding terminal is the sum of the axial dimension of the worm wheel 2 and the radial dimension of the worm
  • the occupied X dimension of the folding terminal is the first worm 3 and the first worm 3 and the first worm.
  • the farthest distance between the two worms 4, the occupied Y dimension of the folding terminal is the axial dimension of the worms. Since the sum of the axial dimension of the worm wheel 2 and the radial dimension of the worm is smaller than the radial dimension of the gear, the synchronizing mechanism provided by the embodiment of the present application occupies a small Z-direction space, while the first worm 3 and the second worm 4 The distance is less than the sum of the radial dimensions of the four gears, so it also takes up less space in the X-direction.
  • the transmission mode of double worms + worm gears is adopted, so that the synchronizing mechanism is in a flat state as a whole, which is consistent with the unfolded shape of the folding terminal, which is beneficial to the light and thin design of the folding terminal.
  • the worm wheel 2 is installed between the base 11 and the shaft cover 12 , the shaft cover 12 is machined with an annular flange 121 , the worm wheel 2 is machined with an annular groove 211 , and the annular flange 121 cooperates with the annular groove 211 to realize The Z-direction limit of the worm gear 2 further saves the Z-direction space of the folding terminal.
  • the embodiment of the present application also provides a folding terminal.
  • the folding terminal includes a first body 7 , a second body 8 , a flexible screen (not shown in the figure), and the synchronization mechanism provided by the embodiment of the present application.
  • the first body 7 and the second body 8 are respectively connected with the first rotating part 5 and the second rotating part 6 in the synchronization mechanism.
  • the flexible screen covers the first body 7 and the second body 8 .
  • the folding terminal provided in the embodiment of the present application may be a folding mobile phone, a folding tablet, or a folding notebook, but is not limited thereto.
  • the first rotating part 5 and the second rotating part 6 may also be referred to as a first swing arm and a second swing arm.
  • a plurality of synchronizing mechanisms may be included in the folding terminal.
  • the axes of the first worms 3 in the multiple synchronization mechanisms are all collinear, and the axes of the second worms 4 in the multiple synchronization mechanisms are all collinear.
  • the first rotating parts 5 in the multiple synchronizing mechanisms are all connected with the first body 7
  • the second rotating parts 6 in the multiple synchronizing mechanisms are all connected with the second body 8 .
  • the folding terminal may include two synchronizing mechanisms, and the two synchronizing mechanisms share a base 11 , the base 11 may be elongated, and the two synchronizing mechanisms are arranged along the length direction of the base 11 . , and are respectively close to both ends of the base 11 .
  • the rotation axes of the first body 7 and the first rotating member 5 (or the second body 8 and the second rotating member 6 ) in the folding terminal may or may not be collinear. Do limit.
  • connection between the first body 7 and the first rotating part 5 can be a fixed connection, and the connection between the second body 8 and the second rotating part 6 can also be a fixed connection.
  • the first body 7 and the second body 8 rotate respectively following the first worm 3 and the second worm 4 .
  • connection between the first body 7 and the first rotating part 5 is a movable connection
  • connection between the second body 8 and the second rotating part 6 is also a movable connection
  • the first body 7 When any part between the second body 8 and the second rotating part 6 rotates, it can drive the other part to rotate; when any part between the second body 8 and the second rotating part 6 rotates, it can drive the other part to rotate.
  • the above-mentioned movable connection may be a connection through a four-bar mechanism.
  • connection should be understood in a broad sense, for example, it may be a solid or detachable connection, or an integral connection, a direct connection, or an indirect connection through an intermediate medium,

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Abstract

本申请公开了一种同步机构和折叠终端，属于电子设备技术领域。本申请提供的同步机构中，第一转动部件和第二转动部件之间通过依次啮合的第一蜗杆、蜗轮和第二蜗杆传动连接。当第一转动部件转动时，第一转动部件带动第一蜗杆转动，第一蜗杆驱动蜗轮转动，蜗轮驱动第二蜗杆转动，第二蜗杆带动第二转动部件转动，从而实现了第一转动部件和第二转动部件相对于基座的同步转动。并且，当该同步机构应用在折叠终端中时，由于蜗轮的轴向、第一蜗杆和第二蜗杆的径向与机体的厚度方向一致，且蜗轮的轴向尺寸、第一蜗杆和第二蜗杆的径向尺寸均较小，所以第一蜗杆、蜗轮和第二蜗杆不会导致机体的厚度过大，有利于折叠终端的轻薄化设计。

Description

同步机构和折叠终端
本申请要求于2021年03月01日提交的申请号为202110227044.8、发明名称为“同步机构和折叠终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电子设备技术领域，特别涉及一种同步机构和折叠终端。
背景技术
近年来随着柔性屏技术的发展，折叠终端的应用越来越广泛。折叠终端的基本架构为基座、两个机体和覆盖在两个机体上的柔性屏，两个机体能够相对于基座同步转动。
为了实现两个机体的同步转动，相关技术中在基座上安装了四个互相啮合的齿轮，两个机体分别与四个齿轮中首尾两个齿轮的转轴固定连接。这样，当一个机体相对于基座转动时，该机体能够通过互相啮合的齿轮驱动另一个机体相对于基座同步转动。
然而，由于使用了齿轮，且齿轮的径向与机体的厚度方向一致，所以为了安装径向尺寸较大的齿轮，机体的厚度也较大，不利于折叠终端的轻薄化设计。
发明内容
本申请实施例提供了一种同步机构和折叠终端，该同步机构采用第一蜗杆、蜗轮和第二蜗杆作为第一转动部件和第二转动部件之间的传动机构，可以实现第一转动部件和第二转动部件的同步转动，并且，当该同步机构应用在折叠终端中时，有利于折叠终端的轻薄化设计。所述同步机构和所述折叠终端的技术方案如下所述：
第一方面，提供了一种同步机构，所述同步机构包括基座、蜗轮、第一蜗杆、第二蜗杆、第一转动部件和第二转动部件。所述蜗轮、所述第一蜗杆和所述第二蜗杆均与所述基座转动连接，所述第一蜗杆和所述第二蜗杆平行，且均与所述蜗轮啮合。所述第一转动部件与所述第一蜗杆固定连接，所述第二转动部件与所述第二蜗杆固定连接。所述蜗轮、所述第一蜗杆和所述第二蜗杆被配置为，使所述第一转动部件和所述第二转动部件相对于所述基座同步转动。
其中，本申请实施例提供的同步机构可以应用在任何有同步转动需求的装置中，例如，应用在折叠终端中，但不限于此。
基座用于安装蜗轮、第一蜗杆和第二蜗杆。
蜗轮、第一蜗杆和第二蜗杆组成第一转动部件和第二转动部件之间的传动机构，使得第一转动部件和第二转动部件同步转动。关于蜗轮、第一蜗杆和第二蜗杆的类型本申请实施例不做限定，示例性的，第一蜗杆和第二蜗杆可以为圆柱蜗杆、环面蜗杆或锥蜗杆。
第一转动部件与第一蜗杆固定连接，第二转动部件与第二蜗杆固定连接。由于蜗轮、第一蜗杆和第二蜗杆的存在，所以当第一转动部件和第二转动部件相对于基座转动时，一定是同步的转动。
本申请实施例所示的方案，通过采用互相啮合的第一蜗杆、蜗轮和第二蜗杆作为第一转动部件和第二转动部件之间的传动机构，使得当第一转动部件转动时，第一转动部件带动第一蜗杆转动，第一蜗杆驱动蜗轮转动，蜗轮驱动第二蜗杆转动，第二蜗杆带动第二转动部件转动(当第二转动部件转动时同理)，从而实现了第一转动部件和第二转动部件相对于基座的同步转动。
并且，当本申请实施例提供的同步机构应用在折叠终端中时，由于蜗轮的轴向、第一蜗杆和第二蜗杆的径向与机体的厚度方向一致，且蜗轮的轴向尺寸、第一蜗杆和第二蜗杆的径向尺寸均较小，所以同步机构不会导致机体的厚度过大，有利于折叠终端的轻薄化设计。
在一种可能的实现方式中，所述蜗轮包括蜗轮主体部和转轴部。所述转轴部与所述蜗轮主体部同轴且固定连接，所述转轴部的两端相对于所述蜗轮主体部的两侧凸出。所述转轴部的两端分别与所述基座转动连接。
本申请实施例所示的方案，通过设置蜗轮主体部和转轴部固定连接，便于蜗轮的小型化设计，更加有利于节省蜗轮占用的空间。
在一种可能的实现方式中，所述基座包括底座和轴盖，所述底座和所述轴盖固定连接。所述蜗轮主体部位于所述底座和所述轴盖之间，且所述转轴部的两端分别与所述底座、所述轴盖转动连接。所述蜗轮主体部朝向所述轴盖的一侧具有环状凹槽，所述环状凹槽与所述转轴部同轴，所述轴盖朝向所述蜗轮主体部的一侧具有环状凸缘，所述环状凸缘位于所述环状凹槽中。
本申请实施例所示的方案，通过在蜗轮主体部开设环状凹槽，在轴盖上设置环状凸缘，并使环状凸缘位于环状凹槽中，对蜗轮的一侧进行了轴向限位。并且，这种限位方式，在保证轴盖的最小厚度的情况下，进一步节省了机体的厚度空间。
在一种可能的实现方式中，所述蜗轮主体部朝向所述底座的一侧具有凸台，所述凸台与所述转轴部同轴，所述底座朝向所述蜗轮主体部的一侧具有限位槽，所述凸台位于所述限位槽中。
本申请实施例所示的方案，在实际应用中，由于蜗轮主体部在朝向轴盖的一侧具有环状凹槽，为了避免进一步削弱蜗轮的强度，且底座的厚度一般较厚，所以可以在蜗轮主体部朝向底座的一侧设置凸台，在底座上开设限位槽，来对蜗轮的另一侧进行轴向限位。
在一种可能的实现方式中，所述第一蜗杆和所述第二蜗杆均包括依次相连的第一转动连接部、螺旋部、非圆形轴部和第二转动连接部。所述第一转动连接部和所述第二转动连接部分别与所述基座转动连接，所述螺旋部与所述蜗轮啮合，所述非圆形轴部与所述第一转动部件或所述第二转动部件固定连接。
本申请实施例所示的方案，通过在第一蜗杆和第二蜗杆上均设置非圆形轴部，便于第一转动部件与第一蜗杆的周向限位，以及第二转动部件与第二蜗杆的周向限位。
在一种可能的实现方式中，所述蜗轮、所述第一蜗杆和所述第二蜗杆的螺旋角大于第一角度阈值且小于第二角度阈值，使得所述同步机构在第一工况、第二工况和第三工况下，所述第一转动部件和所述第二转动部件均能够相对于所述基座同步转动。
其中，所述第一工况为所述第一转动部件和所述第二转动部件同时受驱动力转动的工况，所述第二工况为所述基座不固定，所述第一转动部件和所述第二转动部件中的一个固定，另一个受驱动力转动的工况，所述第三工况为所述基座固定，所述第一转动部件和所述第二转 动部件中的任意一个受驱动力转动的工况。
本申请实施例所示的方案，由于在第一蜗杆、蜗轮和第二蜗杆的传动路线上，存在蜗轮作为主动件驱动第一蜗杆或第二蜗杆的情况，所以该传动机构可能会发生自锁现象，造成传动路线中断，直观后果就是当用户单独驱动第一转动部件或第二转动部件时，整个同步机构卡死不动。
下面，对可能存在的三种工况进行分析：
第一工况，第一转动部件和第二转动部件同时受驱动力转动。在这种工况下，蜗轮仅作为从动件转动，所以不会发生自锁现象。
第二工况，基座不固定，第一转动部件和第二转动部件中的一个固定，另一个受驱动力转动。以第一转动部件受驱动力转动、第二转动部件固定为例，第一转动部件带动第一蜗杆转动，第一蜗杆驱动蜗轮转动，由于第二转动部件固定，所以蜗轮不能驱动第二蜗杆转动，而是会在自传的同时带动基座绕着第二蜗杆转动，从而也实现了第一转动部件和第二转动部件相对于基座的同步转动。由于在第二工况下，存在蜗轮绕蜗杆公转的情况，所以可能会发生自锁现象。
第三工况，基座固定，第一转动部件和第二转动部件中的任意一个受驱动力转动。以第一转动部件受驱动力转动为例，第一转动部件带动第一蜗杆转动，第一蜗杆驱动蜗轮转动，蜗轮驱动第二蜗杆转动，第二蜗杆带动第二转动部件转动，从而实现了第一转动部件和第二转动部件相对于基座的同步转动。由于在第三工况下，存在蜗轮驱动蜗杆的情况，所以可能会发生自锁现象。
为了避免在第二工况和第三工况下自锁现象的发生，本申请实施例将第一蜗杆、蜗轮和第二蜗杆的螺旋角限定在第一角度阈值和第二角度阈值之间，以使得同步机构在任何工况下，均能够实现第一转动部件和第二转动部件相对于基座的同步转动。
在一种可能的实现方式中，所述第一角度阈值为8.63°，所述第二角度阈值为78.67°。
在一种可能的实现方式中，所述蜗轮、所述第一蜗杆和所述第二蜗杆的螺旋角大于第三角度阈值且小于所述第二角度阈值，使得在所述第一工况、所述第二工况和所述第三工况下，所述第一转动部件或所述第二转动部件转动时的驱动力均小于预设值，比如5N，其中，所述第三角度阈值大于所述第一角度阈值。
本申请实施例所示的方案，当同步机构应用在折叠终端中时，为了提升用户手感体验，还可以将蜗轮、第一蜗杆和第二蜗杆的螺旋角限定在第三角度阈值和第二角度阈值之间，使得用户驱动第一转动部件或第二转动部件转动时的驱动力小于预设值，比如5N。
在一种可能的实现方式中，所述第三角度阈值为17.01°。
第二方面，提供了一种折叠终端，所述折叠终端包括第一机体、第二机体、柔性屏和如第一方面任一项所述的同步机构。所述第一机体和所述第二机体分别与所述同步机构中的第一转动部件和第二转动部件连接。所述柔性屏覆盖在所述第一机体和所述第二机体上。
其中，本申请实施例提供的折叠终端，可以是折叠手机、折叠平板或者折叠笔记本，但不限于此。
本申请实施例所示的方案，通过在折叠终端中应用本申请实施例提供的同步机构，有利于折叠终端的轻薄化设计。
在一种可能的实现方式中，所述同步机构为多个。多个所述同步机构中的第一蜗杆的轴线均共线，多个所述同步机构中的第二蜗杆的轴线均共线。多个所述同步机构中的第一转动部件均与所述第一机体连接，多个所述同步机构中的第二转动部件均与所述第二机体连接。
本申请实施例所示的方案，通过设置同步机构为多个，使得第一机体和第二机体之间的传动更加稳定。
示例性的，折叠终端可以包括两个同步机构，且该两个同步机构共用一个基座，基座可以呈长条状，两个同步机构沿基座的长度方向排布，且分别靠近基座的两端。
本申请实施例提供的技术方案带来的有益效果包括：
本申请实施例提供了一种同步机构，该同步机构包括基座、蜗轮、第一蜗杆、第二蜗杆、第一转动部件和第二转动部件，第一转动部件和第二转动部件之间通过依次啮合的第一蜗杆、蜗轮和第二蜗杆传动连接。当第一转动部件转动时，第一转动部件带动第一蜗杆转动，第一蜗杆驱动蜗轮转动，蜗轮驱动第二蜗杆转动，第二蜗杆带动第二转动部件转动，从而实现了第一转动部件和第二转动部件相对于基座的同步转动。
并且，当同步机构应用在折叠终端中时，由于蜗轮的轴向、第一蜗杆和第二蜗杆的径向与机体的厚度方向一致，且蜗轮的轴向尺寸、第一蜗杆和第二蜗杆的径向尺寸较小，所以不会导致机体的厚度过大，有利于折叠终端的轻薄化设计。
附图说明
图1是本申请实施例提供的一种折叠终端和同步机构的示意图；
图2是本申请实施例提供的一种同步机构的示意图；
图3是本申请实施例提供的一种折叠终端的示意图；
图4是本申请实施例提供的一种蜗轮的示意图；
图5是本申请实施例提供的一种蜗轮的安装示意图；
图6是本申请实施例提供的一种蜗轮的示意图；
图7是本申请实施例提供的一种蜗轮的安装示意图；
图8是本申请实施例提供的一种蜗杆的示意图；
图9是本申请实施例提供的一种折叠终端的爆炸视图；
图10是本申请实施例提供的一种同步机构处于第一工况的示意图；
图11是本申请实施例提供的一种同步机构处于第二工况的示意图；
图12是本申请实施例提供的一种同步机构处于第三工况的示意图；
图13是本申请实施例提供的一种蜗杆受力分析的示意图；
图14是本申请实施例提供的一种蜗杆受力分析的示意图；
图15是本申请实施例提供的一种同步机构的示意图。
图例说明
1、基座，11、底座，111、限位槽，12、轴盖，121、环状凸缘，13、第一蜗杆轴座，14、第二蜗杆轴座，15、端盖；
2、蜗轮，21、蜗轮主体部，211、环状凹槽，212、凸台，22、转轴部；
3、第一蜗杆；
4、第二蜗杆；
31、第一转动连接部，32、螺旋部，33、非圆形轴部，34、第二转动连接部；
5、第一转动部件；
6、第二转动部件；
7、第一机体；
8、第二机体。
具体实施方式
近年来随着柔性屏技术的发展，折叠终端的应用逐渐增多。折叠终端携带时，呈折叠状态，方便携带且可加强防护；使用时，呈展平状态，实现双倍屏幕显示的效果。由于柔性屏为连续屏，往往需要在基座中设置同步机构，使左侧机体和右侧机体同步转动，实现柔性屏的展平和折起，但相关技术中的同步机构会导致折叠终端的机体的厚度过大，不利于折叠终端的轻薄化设计。
鉴于此，本申请实施例提供了一种同步机构，该同步机构可以应用在折叠终端中，且不会占用机体较大的厚度空间，有利于折叠终端的轻薄化设计。
如图1所示，示出了一种包括本申请实施例提供的同步机构的折叠终端的示意图，该同步机构的两侧分别连接折叠终端的两个机体，从而实现两个机体同步展开和折起。当然，本申请实施例提供的同步机构还可以应用在其余任何有同步转动需求的装置中，并不限于折叠终端。
如图1和图2所示，同步机构包括基座1、蜗轮2、第一蜗杆3、第二蜗杆4、第一转动部件5和第二转动部件6。蜗轮2、第一蜗杆3和第二蜗杆4均与基座1转动连接，第一蜗杆3和第二蜗杆4平行，且均与蜗轮2啮合。第一转动部件5与第一蜗杆3固定连接，第二转动部件6与第二蜗杆4固定连接。蜗轮2、第一蜗杆3和第二蜗杆4被配置为，使第一转动部件5和第二转动部件6相对于基座1同步转动。
其中，基座1用于安装蜗轮2、第一蜗杆3和第二蜗杆4。
蜗轮2、第一蜗杆3和第二蜗杆4组成第一转动部件5和第二转动部件6之间的传动机构，使得第一转动部件5和第二转动部件6同步转动。关于蜗轮2、第一蜗杆3和第二蜗杆4的类型本申请实施例不做限定，示例性的，第一蜗杆3和第二蜗杆4可以为圆柱蜗杆、环面蜗杆或锥蜗杆。
第一转动部件5与第一蜗杆3固定连接，第二转动部件6与第二蜗杆4固定连接。由于蜗轮2、第一蜗杆3和第二蜗杆4的存在，所以当第一转动部件5和第二转动部件6相对于基座1转动时，一定是同步的转动。如图1所示，当同步机构应用在折叠终端中时，同步机构中的第一转动部件5与折叠终端的第一机体7连接，第二转动部件6与第二机体8连接，从而第一机体7和第二机体8能够相对于基座1同步转动。
本申请实施例所示的方案，通过采用互相啮合的第一蜗杆3、蜗轮2和第二蜗杆4作为第一转动部件5和第二转动部件6之间的传动机构，使得当第一转动部件5转动时，第一转动部件5带动第一蜗杆3转动，第一蜗杆3驱动蜗轮2转动，蜗轮2驱动第二蜗杆4转动，第二蜗杆4带动第二转动部件6转动(当第二转动部件6转动时同理)，从而实现了第一转 动部件5和第二转动部件6相对于基座1的同步转动。
并且，当本申请实施例提供的同步机构应用在折叠终端中时，由于蜗轮2的轴向、第一蜗杆3和第二蜗杆4的径向与机体的厚度方向一致，且蜗轮2的轴向尺寸、第一蜗杆3和第二蜗杆4的径向尺寸均较小，所以，本申请实施例提供的同步机构不会导致机体的厚度过大，有利于折叠终端的轻薄化设计。
具体的，参照图3，对于折叠终端来说，其Z向(折叠终端展开时的厚度方向，即图3中的L1对应的方向)空间最为紧张，X向(折叠终端折叠时的厚度方向，即图3中的L2对应的方向)空间次紧张，而Y向(折叠终端的长度方向)空间较为充足。
相关技术中的折叠终端采用四个相互啮合的齿轮作为传动机构，使得两个机体同步转动。传动机构占用的折叠终端的Z向尺寸至少为一个齿轮的径向尺寸，占用的折叠终端的X向尺寸为四个齿轮的径向尺寸的和，占用的折叠终端的Y向尺寸为齿轮的轴向尺寸(或称为齿轮的厚度)。由于齿轮的径向尺寸较大，且轴向尺寸较小，所以相关技术中的传动机构，占据了较大的Z向空间和X向空间，而节省了无用的Y向空间。
本申请实施例提供的同步机构采用双蜗杆+蜗轮的传动机构，如图3所示，双蜗杆+蜗轮的传动机构占用的折叠终端的Z向尺寸为图3中的L1，占用的折叠终端的X向尺寸为图3中的L2，占用的折叠终端的Y向尺寸为蜗杆的轴向尺寸。由于蜗轮2的轴向尺寸、第一蜗杆3和第二蜗杆4的径向尺寸均较小，所以L1和L2均较小，同步机构占用了较小的Z向空间和X向空间，有利于折叠终端的轻薄化设计。
下面，对本申请实施例提供的同步机构中涉及到的各个部件进行说明：
蜗轮2用于在第一蜗杆3和第二蜗杆4之间传递运动，并起到同步第一蜗杆3和第二蜗杆4的转动的作用。下面结合图4-图8，对本申请实施例提供的蜗轮2的结构以及安装方式进行示例性说明：
如图4所示，蜗轮2包括蜗轮主体部21和转轴部22。转轴部22与蜗轮主体部21同轴且固定连接，转轴部22的两端相对于蜗轮主体部21的两侧凸出。转轴部22的两端分别与基座1转动连接。
本申请实施例提供的蜗轮2可以为一体成型。通过设置蜗轮主体部21和转轴部22固定连接，便于蜗轮2的小型化设计，更加有利于节省蜗轮2占用的空间。
如图5所示，基座1可以包括底座11和轴盖12，底座11和轴盖12固定连接。蜗轮主体部21位于底座11和轴盖12之间，且转轴部22的两端分别与底座11、轴盖12转动连接。具体的，底座11和轴盖12相对的两侧分别设置有转轴孔，转轴部22的两端分别位于两个转轴孔中。
如图4和图5所示，蜗轮主体部21朝向轴盖12的一侧具有环状凹槽211，环状凹槽211与转轴部22同轴，轴盖12朝向蜗轮主体部21的一侧具有环状凸缘121，环状凸缘121位于环状凹槽211中。
通过在蜗轮主体部21开设环状凹槽211，在轴盖12上设置环状凸缘121，并使环状凸缘121位于环状凹槽211中，对蜗轮2朝向轴盖12的一侧进行了轴向限位。
并且，这种限位方式，在保证轴盖12的最小厚度的情况下，进一步节省了机体的厚度空间。需要说明的是，除了上述限位方式之外，还可以在轴盖12上开设凹槽，在蜗轮主体部21朝向轴盖12的一侧设置凸起，并使凹槽和凸起相配合进行限位，本申请实施例对此不做 限定。
如图6和图7所示，蜗轮主体部21朝向底座11的一侧具有凸台212，凸台212与转轴部22同轴，底座11朝向蜗轮主体部21的一侧具有限位槽111，凸台212位于限位槽111中。
在实际应用中，由于蜗轮主体部21在朝向轴盖12的一侧具有环状凹槽211，为了避免进一步削弱蜗轮2的强度，且底座11一般较厚，所以可以在蜗轮主体部21朝向底座11的一侧设置凸台212，在底座11上开设限位槽111，并使凸台212位于限位槽111中，来对蜗轮2朝向底座11的一侧进行轴向限位。当然，也可以是在底座11上设置限位凸台，在蜗轮主体部21朝向底座11的一侧开设限位槽，并使限位凸台和限位槽相配合进行限位。
第一蜗杆3和第二蜗杆4均与蜗轮2啮合，在蜗轮2的作用下，第一蜗杆3和第二蜗杆4同步转动，并带动第一转动部件5和第二转动部件6同步转动。
下面，结合图8，对第一蜗杆3和第二蜗杆4的结构和安装方式进行示例性说明：
如图8所示，第一蜗杆3和第二蜗杆4均包括依次相连的第一转动连接部31、螺旋部32、非圆形轴部33和第二转动连接部34。第一转动连接部31和第二转动连接部34分别与基座1转动连接，螺旋部32与蜗轮2啮合，非圆形轴部33与第一转动部件5或第二转动部件6固定连接。
非圆形轴部33是指横截面形状为非圆形的轴段，通过设置非圆形轴部33，便于第一蜗杆3与第一转动部件5的周向限位，以及第二蜗杆4与第二转动部件6的周向限位。第一蜗杆3与第一转动部件5的固定连接方式，与第二蜗杆4与第二转动部件6的固定连接方式可以相同。下面，以第一蜗杆3与第一转动部件5的固定连接方式为例进行说明：
第一转动部件5可以环套在第一蜗杆3的非圆形轴部33，且第一转动部件5的相应穿孔与非圆形轴部33的外形匹配，使得第一转动部件5与非圆形轴部33成形联结，第一转动部件5在第一蜗杆3上周向固定。
第一转动部件5的一端顶紧螺旋部32的一侧，另一端的限位可以通过挡圈实现，使得第一转动部件5在第一蜗杆3上轴向固定。
基座1用于安装蜗轮2、第一蜗杆3和第二蜗杆4，关于其具体实现方式可以有多种，本申请实施例不做限定。下面，结合图9对基座1进行示例性说明：
如图9所示，基座1包括底座11、轴盖12、第一蜗杆轴座13、第二蜗杆轴座14和端盖15。
底座11和轴盖12固定连接，蜗轮2的蜗轮主体部21位于底座11和轴盖12之间，且蜗轮2的转轴部22的两端分别与轴盖12和底座11转动连接。
第一蜗杆轴座13和第二蜗杆轴座14均固定在底座11上，第一蜗杆3和第二蜗杆4的第一转动连接部31与第一蜗杆轴座13转动连接，第一蜗杆3和第二蜗杆4的第二转动连接部32与第二蜗杆轴座14转动连接。
端盖15固定于底座11的端部，用于封堵底座11的端部。
在折叠终端中采用同步机构时，可以采用多个同步机构，如图9所示，多个同步机构可以共用同一底座11，蜗轮2、第一蜗杆3和第二蜗杆4为多个，蜗轮端盖12、第一蜗杆轴座13和第二蜗杆轴座14也均为多个。
本申请实施例提供的同步机构，采用第一蜗杆3、蜗轮2和第二蜗杆4作为传动机构， 使得第一转动部件5和第二转动部件6同步转动。但是，由于在第一蜗杆3、蜗轮2和第二蜗杆4的传动路线上，存在蜗轮2作为主动件驱动第一蜗杆3或第二蜗杆4的情况，所以该传动机构可能会发生自锁现象，造成传动路线中断，直观后果就是当单独驱动第一转动部件5或第二转动部件6时，整个同步机构卡死不动。
为了保证同步机构不发生自锁现象，本申请实施例将第一蜗杆3和第二蜗杆4的螺旋角限定在第一角度阈值和第二角度阈值之间，使得在任何工况下，第一转动部件5和第二转动部件6均能够相对于基座1同步转动。
下面，结合图10-图13，对同步机构可能涉及到的三种工况进行分析：
第一工况，如图10所示，第一转动部件5和第二转动部件6同时受驱动力转动(用户可以通过第一机体7和第二机体8分别驱动第一转动部件5和第二转动部件6转动)。在这种工况下，蜗轮2仅作为从动件转动，所以不会发生自锁现象。
第二工况，如图11所示，基座1不固定，第一转动部件5和第二转动部件6中的一个固定，另一个受驱动力转动。
以第一转动部件5受驱动力转动、第二转动部件6固定为例，第一转动部件5带动第一蜗杆3转动，第一蜗杆3驱动蜗轮2转动，由于第二转动部件6固定，所以蜗轮2不能驱动第二蜗杆4转动，而是会在自传的同时带动基座1绕着第二蜗杆4转动，从而实现了第一转动部件5和第二转动部件6相对于基座1的同步转动。在第二工况下同步机构的直观表现为，第一转动部件5转动的同时，带动基座1绕第二转动部件6转动。
由于在第二工况下，存在蜗轮2绕蜗杆公转的情况，所以可能会发生自锁现象，理论计算得不发生自锁的条件为
Figure PCTCN2022075014-appb-000001
其中，β为螺旋角(如图14所示)，μ为摩擦系数。
第三工况，如图12所示，基座1固定，第一转动部件5和第二转动部件6中的任意一个受驱动力转动。
以第一转动部件5受驱动力转动为例，第一转动部件5带动第一蜗杆3转动，第一蜗杆3驱动蜗轮2转动，蜗轮2驱动第二蜗杆4转动，第二蜗杆4带动第二转动部件6转动，从而实现了第一转动部件5和第二转动部件6相对于基座1的同步转动。
由于在第三工况下，存在蜗轮2驱动蜗杆转动的情况，所以可能会发生自锁现象，理论计算得不发生自锁的条件为β>tan -1μ，其中，β为螺旋角(如图14所示)，μ为摩擦系数。
假设蜗轮2、第一蜗杆3和第二蜗杆4选用的金属材料的摩擦系数μ在0.15-0.2之间，则将μ代入上述两个公式得8.53 °<β<78.67 °，也即第一角度阈值为8.53°，第二角度阈值为78.67°。
进一步的，为了改善用户的受力体验，避免用户驱动第一转动部件5和/或第二转动部件6的驱动力过大，可以对蜗轮2、第一蜗杆3和第二蜗杆4的螺旋角进一步限定(限定在第三角度阈值和第二角度阈值之间)。由于在第三工况下，用户需要施加的驱动力最大，所以对第三工况下的同步机构进行受力分析：
参见图13和图14，受力分析如下，式中，p为用户施加的驱动力，l为第一转动部件5或第二转动部件6的力矩长度，η为蜗轮蜗杆传动效率，R为蜗轮分度圆半径，r为第一蜗杆3或第二蜗杆4的分度圆半径，μ为摩擦系数，β为螺旋角。
蜗轮推力：
Figure PCTCN2022075014-appb-000002
正压力：
Figure PCTCN2022075014-appb-000003
摩檫力：
Figure PCTCN2022075014-appb-000004
切向力：
Figure PCTCN2022075014-appb-000005
G 2-g>T，T为实测阻力，代入G 2-g>T为
Figure PCTCN2022075014-appb-000006
化简为
Figure PCTCN2022075014-appb-000007
选取用户最大施力P不大于5N(约10个鸡蛋的重量)，摩擦系数取0.15，实测阻力矩TR为6N·mm，则β>17.01°，即第三角度阈值为17.01°。
可以理解的是，由于第三工况下用户需要施加的驱动力最大，所以在保证第三工况下用户施加的驱动力小于5N的前提下，在第一工况和第二工况下用户施加的驱动力也小于5N。
因此，本申请实施例提供的同步机构中，蜗轮2、第一蜗杆3和第二蜗杆4采用大于17.01°小于78°的螺旋角结构，可实现同步机构在以上三种工况下的任意转动，且有利于增大传动效率，提升用户手感体验。
进一步的，综合考虑可制造性和手感体验，本申请实施例中采用的螺旋角可以为25°，第一蜗杆3和第二蜗杆4可以为三头蜗杆，但不限于此，例如还可以为单头蜗杆或双头蜗杆。
需要补充说明的是，以上仅仅以蜗轮2为圆柱蜗轮，第一蜗杆3和第二蜗杆4为圆柱蜗杆为例对同步机构进行示例性说明。在实际应用中，蜗轮2还可以为锥蜗轮或环面蜗轮，第一蜗杆3和第二蜗杆4还可以采用锥蜗杆或环面蜗杆。
示例性的，如图15所示，同步机构中的蜗轮2采用锥蜗轮，蜗轮2的轮齿位于蜗轮2的端面上，第一蜗杆2和第二蜗杆3采用锥蜗杆，且分别与蜗轮2端面上的轮齿啮合。对于这种双蜗杆+蜗轮的传动机构，占用的折叠终端的Z向尺寸为蜗轮2的轴向尺寸和蜗杆的径向尺寸的和，占用的折叠终端的X向尺寸为第一蜗杆3和第二蜗杆4的最远距离，占用的折叠终端的Y向尺寸为蜗杆的轴向尺寸。由于蜗轮2的轴向尺寸和蜗杆的径向尺寸的和小于齿轮的径向尺寸，所以本申请实施例提供的同步机构占用了较小的Z向空间，而第一蜗杆3和第二蜗杆4距离小于四个齿轮的径向尺寸的和，因此也占用了较小的X向空间。
本申请实施例提供的同步机构至少包括以下有益效果：
首先，采用双蜗杆+蜗轮的传动方式，使得同步机构整体呈扁平态，与折叠终端展开形态相一致，有利于折叠终端的轻薄化设计。
其次，蜗轮2安装于底座11和轴盖12之间，轴盖12加工有环状凸缘121，蜗轮2加工有环状凹槽211，环状凸缘121与环状凹槽211相配合实现蜗轮2的Z向限位，进一步节省了折叠终端的Z向空间。
再次，基于理论分析，采用大于17.01°小于78.67°的大螺旋角方式，规避了同步机构的自锁风险，可满足用户在使用过程中的任意方式掰转，且用户的手感体验较好。
本申请实施例还提供了一种折叠终端，如图1所示，折叠终端包括第一机体7、第二机体8、柔性屏(图中未示出)和本申请实施例提供的同步机构。第一机体7和第二机体8分 别与同步机构中的第一转动部件5和第二转动部件6连接。柔性屏覆盖在第一机体7和第二机体8上。
其中，本申请实施例提供的折叠终端，可以是折叠手机、折叠平板或者折叠笔记本，但不限于此。
第一转动部件5和第二转动部件6还可以称为第一摆臂和第二摆臂。
本申请实施例所示的方案，通过在折叠终端中应用本申请实施例提供的同步机构，有利于折叠终端的轻薄化设计。
为了使得第一机体7和第二机体8之间的传动更加稳定，折叠终端中可以包括多个同步机构。多个同步机构中的第一蜗杆3的轴线均共线，多个同步机构中的第二蜗杆4的轴线均共线。多个同步机构中的第一转动部件5均与第一机体7连接，多个同步机构中的第二转动部件6均与第二机体8连接。
示例性的，如图9所示，折叠终端可以包括两个同步机构，且该两个同步机构共用一个底座11，底座11可以呈长条状，两个同步机构沿底座11的长度方向排布，且分别靠近底座11的两端。
需要说明的是，折叠终端中的第一机体7与第一转动部件5(或第二机体8与第二转动部件6)的转动轴线可以共线，也可以不共线，本申请实施例不做限定。
当转动轴线共线时，第一机体7和第一转动部件5之间的连接可以是固定连接，第二机体8和第二转动部件6之间的连接也可以是固定连接。第一机体7和第二机体8分别跟随第一蜗杆3和第二蜗杆4转动。
当转动轴线不共线时，第一机体7与第一转动部件5之间的连接为活动连接，第二机体8与第二转动部件6之间的连接也为活动连接，且第一机体7和第一转动部件5之间的任一部件转动时，能够带动另一部件转动；第二机体8和第二转动部件6之间的任一部件转动时，能够带动另一部件转动。示例性的，上述活动连接可以为通过四杆机构的连接。
本申请的实施方式部分使用的术语仅用于对本申请的实施例进行解释，而非旨在限定本申请。除非另作定义，本申请的实施方式使用的技术术语或者科学术语应当为本申请所属领域内具有一般技能的人士所理解的通常意义。本申请说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”或者“一”等类似词语也不表示数量限制，而是表示存在至少一个。“包括”等类似的词语意指出现在“包括”前面的元件或者物件涵盖出现在“包括”后面列举的元件或者物件及其等同，并不排除其他元件或者物件。术语“连接”应做广义理解，例如，可以是固可拆卸连接，或一体地连接，可以是直接相连，也可以通过中间媒介间接相连，
以上所述仅为本申请的可选实施例，并不用以限制本申请，凡在本申请的原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (12)

  1. 一种同步机构，其特征在于，所述同步机构包括基座(1)、蜗轮(2)、第一蜗杆(3)、第二蜗杆(4)、第一转动部件(5)和第二转动部件(6)；
    所述蜗轮(2)、所述第一蜗杆(3)和所述第二蜗杆(4)均与所述基座(1)转动连接，所述第一蜗杆(3)和所述第二蜗杆(4)平行，且均与所述蜗轮(2)啮合；
    所述第一转动部件(5)与所述第一蜗杆(3)固定连接，所述第二转动部件(6)与所述第二蜗杆(4)固定连接；
    所述蜗轮(2)、所述第一蜗杆(3)和所述第二蜗杆(4)被配置为，使所述第一转动部件(5)和所述第二转动部件(6)相对于所述基座(1)同步转动。
  2. 根据权利要求1所述的同步机构，其特征在于，所述蜗轮(2)包括蜗轮主体部(21)和转轴部(22)；
    所述转轴部(22)与所述蜗轮主体部(21)同轴且固定连接，所述转轴部(22)的两端相对于所述蜗轮主体部(21)的两侧凸出；
    所述转轴部(22)的两端分别与所述基座(1)转动连接。
  3. 根据权利要求2所述的同步机构，其特征在于，所述基座(1)包括底座(11)和轴盖(12)，所述底座(11)与所述轴盖(12)固定连接；
    所述蜗轮主体部(21)位于所述底座(11)和所述轴盖(12)之间，且所述转轴部(22)的两端分别与所述底座(11)、所述轴盖(12)转动连接；
    所述蜗轮主体部(21)朝向所述轴盖(12)的一侧具有环状凹槽(211)，所述环状凹槽(211)与所述转轴部(22)同轴，所述轴盖(12)朝向所述蜗轮主体部(21)的一侧具有环状凸缘(121)，所述环状凸缘(121)位于所述环状凹槽(211)中。
  4. 根据权利要求3所述的同步机构，其特征在于，所述蜗轮主体部(21)朝向所述底座(11)的一侧具有凸台(212)，所述凸台(212)与所述转轴部(22)同轴，所述底座(11)朝向所述蜗轮主体部(21)的一侧具有限位槽(111)，所述凸台(212)位于所述限位槽(111)中。
  5. 根据权利要求1-4任一项所述的同步机构，其特征在于，所述第一蜗杆(3)和所述第二蜗杆(4)均包括依次相连的第一转动连接部(31)、螺旋部(32)、非圆形轴部(33)和第二转动连接部(34)；
    所述第一转动连接部(31)和所述第二转动连接部(34)分别与所述基座(1)转动连接，所述螺旋部(32)与所述蜗轮(2)啮合，所述非圆形轴部(33)与所述第一转动部件(5)或所述第二转动部件(6)固定连接。
  6. 根据权利要求1-5任一项所述的同步机构，其特征在于，所述蜗轮(2)、所述第一蜗 杆(3)和所述第二蜗杆(4)的螺旋角大于第一角度阈值且小于第二角度阈值，使得所述同步机构在第一工况、第二工况和第三工况下，所述第一转动部件(5)和所述第二转动部件(6)均能够相对于所述基座(1)同步转动；
    其中，所述第一工况为所述第一转动部件(5)和所述第二转动部件(6)同时受驱动力转动的工况，所述第二工况为所述基座(1)不固定，所述第一转动部件(5)和所述第二转动部件(6)中的一个固定，另一个受驱动力转动的工况，所述第三工况为所述基座(1)固定，所述第一转动部件(5)和所述第二转动部件(6)中的任意一个受驱动力转动的工况。
  7. 根据权利要求6所述的同步机构，其特征在于，所述第一角度阈值为8.63°，所述第二角度阈值为78.67°。
  8. 根据权利要求6或7所述的同步机构，其特征在于，所述蜗轮(2)、所述第一蜗杆(3)和所述第二蜗杆(4)的螺旋角大于第三角度阈值且小于所述第二角度阈值，使得在所述第一工况、所述第二工况和所述第三工况下，所述第一转动部件(5)或所述第二转动部件(6)转动时的驱动力均小于设定值，其中，所述第三角度阈值大于所述第一角度阈值。
  9. 根据权利要求8所述的同步机构，其特征在于，所述设定值为5N。
  10. 根据权利要求9所述的同步机构，其特征在于，所述第三角度阈值为17.01°。
  11. 一种折叠终端，其特征在于，所述折叠终端包括第一机体(7)、第二机体(8)、柔性屏和如权利要求1-10任一项所述的同步机构；
    所述第一机体(7)和所述第二机体(8)分别与所述同步机构中的第一转动部件(5)和第二转动部件(6)连接；
    所述柔性屏覆盖在所述第一机体(7)和所述第二机体(8)上。
  12. 根据权利要求11所述的折叠终端，其特征在于，所述同步机构为多个；
    多个所述同步机构中的第一蜗杆(3)的轴线均共线，多个所述同步机构中的第二蜗杆(4)的轴线均共线；
    多个所述同步机构中的第一转动部件(5)均与所述第一机体(7)连接，多个所述同步机构中的第二转动部件(6)均与所述第二机体(8)连接。
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