CN216666216U - Switching type double-shaft pivot device and electronic device using same - Google Patents

Abstract

A switching type double-shaft pivot device and an electronic device using the same are provided, wherein the switching type double-shaft pivot device comprises a mounting component, a first rotating shaft and a second rotating shaft which are arranged on the mounting component, and a switching piece and a buffering elastic piece which are arranged between the first rotating shaft and the second rotating shaft. The buffering elastic sheet can generate a buffering effect on the rotation of the first rotating shaft and the second rotating shaft, so that the problem of blocking hand feeling during switching can be reduced, smooth operation hand feeling is provided, and the buffering elastic sheet can also reduce the collision of the switching piece on the switching cam of the first rotating shaft and the second rotating shaft, so that abnormal sound and abrasion are reduced.

Description

Switch-type dual-axis hub and electronic device using the same

technical field

The utility model relates to a double-shaft hinge device, in particular to a switching type that connects two bases of a flip type electronic device, and can provide a smooth operating feel during the relative opening and closing of the two bases. Dual axis hub.

Background technique

Laptops, mobile phones, handheld game consoles and other flip-top electronic devices are common and portable electronic devices on the market today. The base body can be relatively pivoted and opened and closed, and in order to effectively increase the relative expansion angle of the two base bodies, a biaxial hinge device can be used, and the biaxial hinge device generally has a first rotation axis and a second axis. A rotating shaft, the first rotating shaft and the second rotating shaft are respectively connected to the two bases.

In addition, one of the two-axis hinges is a synchronous rotation type, that is, the first rotating shaft and the second rotating shaft are connected through a gear set, and when the first rotating shaft is forced to rotate, it can synchronously drive the second rotating shaft to rotate together; A double-shaft pivot device is a switch type. When the first shaft is forced to rotate, the second shaft will be locked and cannot be rotated. When the first shaft rotates to a predetermined angle, it will be switched to the second shaft that can rotate and the second shaft to rotate. A state in which the shaft is locked and cannot be rotated.

Wherein, when the prior art switch-type dual-axis hinge is switched from the first rotating shaft to the second rotating shaft, the transmission plate originally used to lock the second rotating shaft will be pushed up by the second rotating shaft and move to abut against the first rotating shaft. Rotating shaft, so that the first rotating shaft cannot be rotated. Similarly, when switching from the second rotating shaft to the first rotating shaft, the first rotating shaft pushes the driving piece to move against the second rotating shaft. During the above switching process, the collision between the transmission plate and the first rotating shaft or the second rotating shaft will not only produce abnormal noise, but also wear at the collision place, which will affect the locking of the switching double-shaft hinge after long-term use. , Switching effect, and in addition, when the user flips the base to the switching angle, it will also produce a stuck feel because the transmission plate is instantly unlocked.

As mentioned above, therefore, the prior art switch-type dual-shaft hinge still needs to be further improved.

Utility model content

In view of the problems existing in the aforementioned prior art, the purpose of the present invention is to provide a switch-type biaxial hinge device and an electronic device using the same, which can reduce the relative opening of the two bases of the electronic device. The abnormal noise and wear caused by the collision of components during the closing process provide a smooth operating feel.

In order to achieve the aforementioned purpose, the technical means adopted by the present utility model is to propose a switch-type dual-axis pivot device, which includes:

an installation component;

a first rotating shaft, which is rotatably disposed on the mounting assembly, and a first switching cam and a first transmission cam are arranged on the first rotating shaft;

a second rotating shaft, which is arranged parallel to the first rotating shaft, and is rotatably disposed on the mounting assembly, and a second switching cam and a second transmission cam are arranged on the second rotating shaft;

A switching piece is arranged between the first switching cam and the second switching cam, and the switching member switches the locking and pivoting of the first switching cam and the second switching cam correspondingly according to the pivoting action of the first rotating shaft and the second rotating shaft turn mode;

A buffer elastic piece is arranged between the first transmission cam and the second transmission cam. The two ends of the buffer elastic piece have a first elastic arm and a second elastic arm symmetrically. The buffer elastic piece is based on the first rotating shaft and the second rotating shaft. In the pivoting mode, the first elastic arm and the second elastic arm control the degree of elastic compression or elastic release of the first transmission cam and the second transmission cam correspondingly.

In the switch-type dual-axis hub:

The first switching cam has a first switching stop end and a first switching free end;

The second switching cam has a second switching stop end and a second switching free end;

The switching element is switched to the first switching stop end, so as to control the locking of the first rotating shaft and the pivoting of the second rotating shaft;

The switching member is switched to the second switching stop end to control the locking of the second rotating shaft while the first rotating shaft is pivoted.

In the switch-type dual-axis hub:

The first transmission cam has a first transmission stop end and a first transmission free end;

The second transmission cam has a second transmission stop end and a second transmission free end;

The buffer shrapnel controls the first elastic arm and the second elastic arm to press against the first transmission stop end and the first transmission free end of the first transmission cam according to the pivoting mode of the first rotation shaft and the second rotation shaft, and the second transmission The degree of elastic compression or elastic release between the second transmission stop end of the cam and the second transmission free end.

In the switch-type dual-axis hub:

The first switching cam and the first transmission cam are integrally formed on the first rotating shaft;

The second switching cam and the second transmission cam are integrally formed on the second rotating shaft.

In the switch-type biaxial hinge device, the installation component can have a through groove, and the switching member and the buffer elastic sheet are accommodated in the through groove.

The switch-type dual-axis hinge device further includes two torsion force generating modules, which are respectively sleeved and fixed on the first rotating shaft and the second rotating shaft, and the two torsion force generating modules provide the torsion force required by the first rotating shaft and the second rotating shaft when pivoting. .

In the switch-type dual-axis hinge device, the installation assembly includes a main support and an auxiliary support arranged at intervals, and the first rotating shaft and the second rotating shaft are parallel and rotatably penetrate through the main support and the auxiliary support, and the switching is performed. The component and the buffer elastic sheet are arranged on the main support, and the two torsion generating modules are located on one side adjacent to the auxiliary support and away from the main support.

In the switch-type dual-shaft hinge device, the combination of the first switching cam, the second switching cam and the switching member, and the combination of the first transmission cam, the second transmission cam and the buffer elastic sheet are selectively arranged on the main support, between the auxiliary support and the two torque generating modules.

In the switch-type biaxial hinge device, each torsion generating module can include a plurality of disc-shaped elastic pads, a plurality of friction pads, a plurality of spacers and a fixing piece, and each spacer is located in two adjacent ones. Between the friction pads, the plurality of disc-shaped elastic pads and the fixing member are arranged on the end of the corresponding first rotating shaft or the second rotating shaft, and are far away from the installation component.

In order to achieve the aforementioned purpose, the technical means adopted by the present invention is to provide an electronic device, which includes a first base body, a second base body, and a switch-type biaxial hinge device as described above, wherein the switch-type biaxial The first rotating shaft of the hinge device is connected with the first base body, and the second rotating shaft is connected with the second base body.

The advantage of the present invention lies in that, in the process of switching from the rotation of the first shaft to the rotation of the second shaft, the two ends of the buffer elastic sheet will have a buffering effect on the rotation of the first shaft and the second shaft, so that the switching time can be reduced. The problem of stuck feel provides a smooth operating feel. Furthermore, since the rotation of the first rotating shaft and the second rotating shaft is buffered, the collision of the switching element on the transmission cam parts of the first rotating shaft and the second rotating shaft can be effectively reduced, so as to avoid abnormal noise and noise generated during the collision. wear effect.

Description of drawings

FIG. 1 is a schematic three-dimensional appearance diagram of an electronic device of the present invention.

FIG. 2 is an exploded perspective view of the first preferred embodiment of the switch-type biaxial hinge of the present invention.

3 is a side cross-sectional view of the first preferred embodiment of the switch-type biaxial hinge of the present invention in a closed state.

4 is another side cross-sectional view of the first preferred embodiment of the switch-type biaxial hinge device of the present invention in a closed state.

5 is a side cross-sectional view of the first preferred embodiment of the switch-type biaxial hinge of the present invention at a predetermined switching angle.

6 is another side cross-sectional view of the first preferred embodiment of the switch-type biaxial hinge of the present invention at a predetermined switching angle.

FIG. 7 is a side sectional view of the first preferred embodiment of the switch-type biaxial hinge device of the present invention unfolded by 180 degrees.

FIG. 8 is another side cross-sectional view of the first preferred embodiment of the switch-type biaxial hinge device of the present invention, which is unfolded by 180 degrees.

FIG. 9 is a perspective appearance view of the second preferred embodiment of the switchable biaxial hinge of the present invention.

FIG. 10 is an exploded perspective view of the second preferred embodiment of the switch-type biaxial hinge of the present invention.

FIG. 11 is a side view of the second preferred embodiment of the switch-type biaxial hinge of the present invention.

FIG. 12 is a side sectional view of the second preferred embodiment of the switch-type biaxial hinge of the present invention in an unfolded state.

13 is another side cross-sectional view of the second preferred embodiment of the switch-type biaxial hinge of the present invention in an unfolded state.

Detailed ways

The technical means adopted by the present invention to achieve the intended purpose of the utility model are further described below in conjunction with the drawings and the preferred embodiments of the present invention.

Referring to FIG. 1 , it is an electronic device 60 provided with the switchable biaxial hinge 1 according to the first preferred embodiment of the present invention. The electronic device 60 includes a first base 61 , a second base 62 and Two switchable biaxial hinges 1 are installed on the electronic device 60 symmetrically to each other, and the first base 61 and the second base 62 can use the switchable biaxial hinge 1 and relative opening and closing.

Further referring to FIG. 2 , the switchable biaxial hinge device 1 includes an installation assembly 10 , a first rotating shaft 21 , a second rotating shaft 22 , two torque generating modules 30 , a switching member 41 , a buffer spring 42 , a first A support frame 51 and a second support frame 52 .

The mounting assembly 10 includes a main support 11 and an auxiliary support 12 arranged at intervals, and the mounting assembly 10 has a through slot 111 . In this embodiment, the through slot 111 is provided on the main support 11 .

Referring to FIG. 3 and FIG. 4 , the first rotating shaft 21 is rotatably disposed on the main support 11 and the auxiliary support 12 of the mounting assembly 10 , and the first rotating shaft 21 has a set of connecting rods 211 and a fixed connection A first switching cam 213 and a first transmission cam 215 are arranged on the first rotating shaft 21 , and the sleeve portion 211 of the first rotating shaft 21 is formed at one end of the first rotating shaft 21 and rotatably penetrates the main support 11 and the auxiliary support 12 , the fixing part 212 of the first rotating shaft 21 is formed on the other end of the first rotating shaft 21 , the first switching cam 213 and the first transmission cam 215 are arranged around the socket rod part 211 of the first rotating shaft 21 superior. The first switching cam 213 has a first switching stop end 2131 and a first switching free end 2132 , and the first transmission cam 215 has a first transmission stop end 2151 and a first transmission free end 2152 .

The second rotating shaft 22 and the first rotating shaft 21 are arranged parallel to each other, and are rotatably disposed through the main support 11 and the auxiliary support 12 of the mounting assembly 10 . The second rotating shaft 22 also has a set of connecting rod portions 221 and a fixed The connecting portion 222, a second switching cam 223 and a second transmission cam 225 are arranged on the second rotating shaft 22, and the sleeve portion 221 of the second rotating shaft 22 is formed at one end of the second rotating shaft 22 and rotatably penetrates the main support The seat 11 and the auxiliary support 12 , the fixing portion 222 of the second rotating shaft 22 is formed on the other end of the second rotating shaft 22 , and the second switching cam 223 and the second transmission cam 225 are provided on the sleeve portion 221 of the second rotating shaft 22 . The second switching cam 223 corresponds to the position of the first switching cam 213 of the first rotating shaft 21 , and the second transmission cam 225 corresponds to the position of the first transmission cam 215 of the first rotating shaft 22 . The second switching cam 223 has a second switching stop end 2231 and a second switching free end 2232 , and the second transmission cam 225 has a second transmission stop end 2251 and a second transmission free end 2252 .

The two torsion generating modules 30 are respectively sleeved and fixed on the sleeved rod portion 211 of the first rotating shaft 21 and the sleeved rod portion 221 of the second rotating shaft 22 , so as to provide the first rotating shaft 21 and the second rotating shaft 22 when they pivot. required torque. Each torsion generating module 30 includes a plurality of disk-shaped elastic pads 31 , a plurality of friction pads 32 , a plurality of spacers 34 and a fixing piece 33 , and each spacer 34 is located between two adjacent friction pads 32 . , the plurality of disk-shaped elastic spacers 31 are fixed on the ends of the corresponding first rotating shaft 21 and the second rotating shaft 22 in combination with the fixing member 33 , and are away from the mounting assembly 10 . In the specific embodiment of the present invention, the disk-shaped elastic washer 31 and the friction washer 32 are sleeved on the sleeved rod parts 211 and 221, and are clamped to the main support 11, the auxiliary support 12 and the fixing member between 33.

Further, in the specific embodiment of the present invention, the disk-shaped elastic washer 31 is provided between the auxiliary support 12 and the fixing member 33 , and the friction washer 32 is provided between the main support 11 and the auxiliary support 12 .

As shown in FIG. 3 and FIG. 7 , the switching member 41 is a rigid sheet body, which is disposed between the first switching cam 213 of the first rotating shaft 21 and the second switching cam 223 of the second rotating shaft 22 . The pivoting action of the rotating shaft 21 and the second rotating shaft 22 correspondingly switches the locking and pivoting modes of the first switching cam 213 and the second switching cam 223 . Specifically, the switching member 41 is switched to the first switching stop end 2131 of the first switching cam 213 to control the locking of the first rotating shaft 21 while the second rotating shaft 22 is pivoted; the switching member 41 is switched to the second switching cam 223 The second switching stop end 2231 controls the locking of the second rotating shaft 22 while the first rotating shaft 21 pivots. More specifically, the first switching free end 2132 and the second switching free end 2232 of the first switching cam 213 and the second switching cam 223 push against the switching member 41 in sequence, so that the switching member 41 is in the first switching cam 213 and the second switching cam 223 move back and forth, and when the switching member 41 moves along the switching free ends 2132, 2232 of one of the switching cams 213, 223, the switching stop ends 2231, 2131 of the other switching cam 223, 213 It is locked with the switching member 41 and cannot be rotated. In the specific embodiment of the present invention, both ends of the switching member 41 are respectively formed as straight sides, and the switching stop ends 2131 and 2231 of each switching cam 213 and 223 are formed as flat surfaces. When the planar switching stop ends 2131 and 2231 on the corresponding switching cams 213 and 223 are in contact with each other, the switching cams 213 and 223 and the switching member 41 are locked to each other and cannot rotate, but the switching cams 213 and 223 can be connected to each other. The structure of the mutual locking of the switching members 41 is not limited to the above.

As shown in FIG. 4 , the buffer elastic sheet 42 is an elastic sheet body, and is disposed between the first transmission cam 215 of the first rotating shaft 21 and the second transmission cam 225 of the second rotating shaft 22 . Both ends of the buffer elastic sheet 42 have symmetrical A first elastic arm 421 and a second elastic arm 422, the first elastic arm 421 and the second elastic arm 422 are respectively held against the first transmission cam 215 and the second transmission cam 225, the buffer elastic piece 42 is based on the first rotating shaft 21 and the pivoting mode of the second rotating shaft 22, so that the first elastic arm 421 and the second elastic arm 422 control the degree of elastic compression or elastic release against the first transmission cam 215 and the second transmission cam 225, so that the The first rotating shaft 21 and the second rotating shaft 22 are formed with a moment that drives the first rotating shaft 21 and the second rotating shaft 22 to rotate. Specifically, the buffer elastic sheet 42 controls the first elastic arm 421 and the second elastic arm 422 to press against the first transmission stop end of the first transmission cam 215 according to the pivoting mode of the first rotation shaft 21 and the second rotation shaft 22 . 2151 and the first transmission free end 2152, the second transmission stop end 2251 of the second transmission cam 225 and the second transmission free end 2252 of the elastic compression or elastic release degree. The above-mentioned buffer elastic sheet 42 can form the required elastic force by using the material or structure, and can also form the required elastic force by using the material and the structure at the same time.

The first support frame 51 is fixed to the fixing portion 212 of the first rotating shaft 21 so as to be able to be linked together with the first rotating shaft 21 , and the first support frame 51 is used for fixing the first base 61 of the aforementioned electronic device 60 to each other. , so that the first rotating shaft 21 of the switchable biaxial hinge can be connected to the first base body 61 through the first bearing frame 51 .

The second support frame 52 is fixed to the fixing portion 222 of the second rotating shaft 22 so as to be able to be linked together with the second rotating shaft 22 , and the second support frame 52 is used for fixing the second base body 62 of the electronic device 60 to each other. , so that the second rotating shaft 22 of the switchable biaxial hinge can be connected to the second base 62 through the second bearing frame 52 .

Referring to FIG. 1 , FIG. 3 and FIG. 4 , when the first seat body 61 and the second seat body 62 of the electronic device 60 are in a covered state, the first switching of the first switching cam 213 of the first rotating shaft 21 is free The end 2132 abuts against the switching member 41, the second rotating shaft 22 is locked with the switching member 41 by the second switching stop end 2231 on the second switching cam 223, and the two ends of the buffer elastic sheet 42 respectively abut the first rotating shaft The first transmission cam 215 of 21 and the second transmission cam 225 of the second shaft 22 .

At this time, when the user starts to turn over the second seat body 62, since the switching member 41 can move along the first switching free end 2132 of the first switching cam 213 of the first rotating shaft 21, the main support 11, the auxiliary support 12 and the The second rotating shaft 22 will rotate relative to the first rotating shaft 21 together. Since the second rotating shaft 22 and the switching member 41 are locked with each other, the first switching cam 213 of the first rotating shaft 21 and the second switching cam 223 of the second rotating shaft 22 have no The space is available for the switching member 41 to move, so the second rotating shaft 22 cannot rotate relative to the main support 11 and the auxiliary support 12 .

Referring further to FIGS. 5 and 7 , until the first switching stop end 2131 of the first switching cam 213 of the first rotating shaft 21 faces the switching member 41 , between the first switching cam 213 of the first rotating shaft 21 and the switching member 41 At this time, the second rotating shaft 22 can start to rotate further relative to the main support 11 and the auxiliary support 12, and the second switching cam 223 of the second rotating shaft 22 can freely switch The end 2232 pushes the switching member 41 to move toward the first switching cam 213 of the first rotating shaft 21 until the switching member 41 moves to the first transmission stop end 2131 to form mutual locking.

Further referring to FIG. 6 to FIG. 8 , in the process of switching from the rotation of the first rotating shaft 21 to the rotating of the second rotating shaft 22 , the first elastic arm 421 of the buffer elastic sheet 42 will adjust to the first rotating shaft 21 according to the degree of rotation of the first rotating shaft 21 . The elastic compression amount of the first transmission stop end 2151 of the transmission cam 215 gradually increases. The amount of elastic compression of the second elastic arm 422 of the buffer elastic sheet 42 on the second transmission stop end 2251 of the second transmission cam 225 gradually decreases according to the degree of rotation of the second rotating shaft 22 . At this time, the second elastic arm 422 presses against the second transmission stop end 2251 of the second transmission cam 225 at the free end 2252 of the second transmission. From the above elastic variation relationship, it can be known that the buffer elastic piece 42 will indeed produce a corresponding buffer effect according to the relative rotation between the first rotating shaft 21 and the second rotating shaft 22, which can reduce the problem of stuck feel during switching, and provide Smooth operation feel. Since the rotation of the first rotating shaft 21 and the second rotating shaft 22 is buffered, the collision of the switching member 41 on the first switching cam 213 of the first rotating shaft 21 and the second switching cam 223 of the second rotating shaft 22 can be effectively reduced, so that the To achieve the effect of avoiding the abnormal sound produced by the collision.

As shown in FIG. 2 to FIG. 4 , in the first preferred embodiment of the switch-type double-shaft hinge of the present invention, the through-slot 111 is formed on the main support 11 , and the through-slot 111 is located between the first rotating shaft 21 and the Between the second rotating shafts 22 , the aforementioned switching member 41 and the aforementioned buffer elastic pieces 42 are accommodated in the through grooves 111 of the main support 11 , and the first switching cam 213 and the first transmission cam 215 of the first rotating shaft 21 are integrally formed. Where the socket rod portion 211 of the first rotating shaft 21 is adjacent to the fixing portion 212 thereof, the second switching cam 223 and the second transmission cam 225 of the second rotating shaft 22 are also integrally formed on the socket of the second rotating shaft 22 by integral molding. The rod portion 221 is adjacent to the fixing portion 222 thereof, and the two torsion force generating modules 30 are located on one side adjacent to the auxiliary support 12 and away from the main support 11 .

Except that the first switching cam 213 and the first transmission cam 215 are integrally formed on the first rotating shaft 21, and the second switching cam 223 and the second transmission cam 225 are integrally formed on the second rotating shaft 22. In addition to the structural design, it can also be an independent structural design. Please refer to FIG. 9 to FIG. 11 , which are the second preferred embodiment of the switch-type biaxial hinge device 1A of the present invention. Since the operation principle of the second preferred embodiment is the same as that of the first preferred embodiment, it will not be repeated here, and only the structural differences will be described. The combination of the first switching cam 213A, the second switching cam 223A and the switching member 42A, as well as the combination of the first transmission cam 215A, the second transmission cam 225A and the buffer spring 42A can also be selectively provided on the main support 11A and the auxiliary support between the seat 12A and the two torque generating modules 30A. In the specific embodiment of the present invention, the first switching cam 213A of the first rotating shaft 21A and the second switching cam 223A of the second rotating shaft 22A are respectively sleeved and fixed on the first rotating shaft 21A and the second rotating shaft 223A in the form of separate components. The socket rods 211A and 221A of the rotating shaft 22A are disposed between the main support 11A and the spacer 24A, as shown in FIG. 12 , and correspondingly, the transmission member 41A is also disposed between the main support 11A and the spacer 34A In between, the first transmission cam 215A of the first rotating shaft 21A and the second transmission cam 225A of the second rotating shaft 22A are also in the form of separate components sleeved and fixed on the sleeved rods of the first rotating shaft 21A and the second rotating shaft 22A respectively. Parts 211A and 221A, and are arranged between the auxiliary support 12A and the spacer 34A, as shown in FIG. 13 , correspondingly, the buffer elastic sheet 42A is also arranged between the auxiliary support 12A and the spacer 34A, and the torque generating module The disc-shaped elastic washer 31A and the friction washer 32A of 30A are clamped between the auxiliary support 12A and the fixing member 33A, and the switching cams 213A, 223A and the transmission cams 215A, 225A are used for switching and buffering the first rotating shaft. In addition to the rotation of 21A and the second rotating shaft 22A, an effect like a friction pad can also be produced.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Anyone familiar with the Those skilled in the art, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to equivalent examples of equivalent changes by using the technical content disclosed above, provided that the content of the technical solution of the present invention is not departed from , any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (10)

1. A switching type biaxial hinge device is characterized in that, comprising: an installation component; a first rotating shaft, which is rotatably disposed on the mounting assembly, and a first switching cam and a first transmission cam are arranged on the first rotating shaft; a second rotating shaft, which is arranged parallel to the first rotating shaft, and is rotatably disposed on the mounting assembly, and a second switching cam and a second transmission cam are arranged on the second rotating shaft; a switching member disposed between the first switching cam and the second switching cam, the switching member correspondingly switches the first switching shaft on and off according to the pivoting action of the first rotating shaft and the second rotating shaft locking and pivoting modes of the switching cam and the second switching cam; A buffer elastic sheet is arranged between the first transmission cam and the second transmission cam. Both ends of the buffer elastic sheet have a first elastic arm and a second elastic arm symmetrically. The buffer elastic sheet is based on the The pivoting mode of the first rotating shaft and the second rotating shaft enables the first elastic arm and the second elastic arm to control the elastic compression of the first transmission cam and the second transmission cam correspondingly or degree of elastic release. 2. The switch-type biaxial hinge device as claimed in claim 1, characterized in that: the first switching cam has a first switching stop end and a first switching free end; the second switching cam has a second switching stop end and a second switching free end; the switching member is switched to the first switching stop end, so as to control the locking of the first rotating shaft, while the second rotating shaft is pivoted; The switching member is switched to the second switching stop end to control the second rotation shaft to be locked while the first rotation shaft is pivoted. 3. The switch-type biaxial hinge device as claimed in claim 2, characterized in that: the first transmission cam has a first transmission stop end and a first transmission free end; The second transmission cam has a second transmission stop end and a second transmission free end; The buffer elastic sheet controls the first elastic arm and the second elastic arm to press the first elastic arm of the first transmission cam correspondingly according to the pivoting mode of the first rotation shaft and the second rotation shaft The degree of elastic compression or elastic release between the transmission stop end and the first transmission free end, and the second transmission stop end of the second transmission cam and the second transmission free end. 4. The switch-type biaxial hinge device as claimed in claim 1, characterized in that: The first switching cam and the first transmission cam are integrally formed on the first rotating shaft; The second switching cam and the second transmission cam are integrally formed on the second rotating shaft. 5 . The switch-type biaxial hinge device according to claim 1 , wherein the mounting assembly has a through groove, and the switching member and the buffer elastic sheet are accommodated in the through groove. 6 . 6 . The switch-type biaxial hinge device according to claim 1 , further comprising two torsion force generating modules, respectively sleeved and fixed on the first rotating shaft and the second rotating shaft, and the two torsion force generating modules are respectively sleeved and fixed on the first rotating shaft and the second rotating shaft. The module provides the torque required for the pivoting of the first shaft and the second shaft. 7 . The switch-type dual-shaft hinge device according to claim 6 , wherein the installation assembly comprises a main support and an auxiliary support arranged at intervals, and the first rotating shaft and the second rotating shaft The main support and the auxiliary support are parallel and rotatable through the main support, the switching element and the buffer elastic sheet are arranged on the main support, and the two torque generating modules are located at a side adjacent to the auxiliary support. side and away from the main support. 8 . The switching double-shaft hinge device according to claim 7 , wherein the combination of the first switching cam, the second switching cam and the switching member, and the first transmission cam, the The combination of the second transmission cam and the buffer elastic sheet is selectively disposed between the main support, the auxiliary support and the two torque generating modules. 9 . The switch-type biaxial hinge device according to claim 7 , wherein each torque generating module comprises a plurality of disk-shaped elastic pads, a plurality of friction pads, a plurality of spacers and a fixing member, each One of the spacers is located between two adjacent friction pads, the plurality of disc-shaped elastic pads and the fixing member are arranged on the corresponding ends of the first rotating shaft or the second rotating shaft, and away from the mounting assembly. 10. An electronic device, characterized in that it comprises a first base, a second base, and at least one switch-type biaxial hinge device according to any one of claims 1 to 9, wherein the switch-type The first rotating shaft of the biaxial hinge is connected to the first base body, and the second rotating shaft is connected to the second base body.

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