Transmission device, flip machine and closestool

Abstract

The utility model relates to a transmission device which comprises an output piece, an input piece, a torsion spring and an end cover, the output piece, the input piece, the torsion spring and the end cover are coaxially arranged along the same axis, the end cover is connected with the input piece, and therefore a containing space for containing at least one part of the torsion spring and the output piece is formed. The torsional spring is provided with a torsional spring body, a first end and a second end, the first end extends out of the torsional spring body in the radial direction relative to the axis direction, the second end extends out of the torsional spring body in the axis direction, and the torsional spring body is tightly wound on at least part of the peripheral face of the output piece. The input part can make the output part rotate in the first direction when the first end exerts tangential force relative to the axis, and can make the output part rotate in the second direction opposite to the first direction when the second end exerts tangential force relative to the axis. The utility model further relates to a flip machine and a closestool.

Description

Technical Field

[0001] The utility model relates to a transmission device, comprising an output member, an input member, a torsion spring and an end cover, wherein the output member, the input member, the torsion spring and the end cover are coaxially arranged along the same axis. The utility model also relates to a lid-opening machine equipped with the transmission device and a toilet equipped with the lid-opening machine. Background Art

[0002] Applications involving torque transmission, such as flip-top and door-opening mechanisms, often incorporate transmission devices. Under normal circumstances, torque is transmitted through the transmission device. However, in the event of an abnormality, such as a user operating the device violently, the torque applied to the transmission device exceeds a threshold, causing the transmission components to slip relative to each other, disrupting the torque transmission path. This protects the transmission mechanism and actuator (motor) from overload damage. When the torque drops within the threshold, the slippage ceases, and the transmission device resumes normal operation. Therefore, this transmission device is also called a rotating device.

[0003] The friction type rotating device which clamps the shaft cylinder by a torsion spring is known from the prior art. The main problems are:

[0004] In some designs, both ends of the torsion spring extend radially into the slit of the torque input component. This means the slit's axial height must be greater than the torsion spring's. This longer slit results in a thinner, axially taller structure in the torque input component, significantly reducing its strength.

[0005] In some designs, the torque output component is directly supported at one end in the large axial hole of the torque input component (which results in large manufacturing errors) and axially fixed at the end face with a retaining ring. Because the retaining ring and the end face of the torque input component are not complete circular rings, there is significant friction at the gap, which may even cut the end face of the torque input component, causing the torque input component to wear faster. Furthermore, the retaining ring is small and made of metal, resulting in high hardness, making it difficult to apply force during disassembly and easily damaging the softer torque output component. Furthermore, in this design, a support shaft is also axially passed through the small axial hole of the torque output component for support. Overall, this results in the cumulative fit error generated by the rotational fit between the torque input component and the torque output component, and the rotational fit between the torque output component and the support shaft, being much greater than the error when the two components are fitted separately with the support shaft. Such large errors can reduce product reliability.

[0006] Some designs lack axial stoppers, allowing the gears to move axially, compromising transmission stability. In particular, when slipping, the torsion spring inevitably slips axially relative to the component it holds, pushing the gears apart and increasing the axial height of the rotating assembly, leading to rapid wear on the contact surface with the mating component. Utility Model Content

[0007] Based on the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a transmission device, a flap machine with the transmission device, and a toilet, which at least partially overcome the above-mentioned shortcomings in the prior art.

[0008] According to the present invention, a transmission device is proposed, which includes an output member, an input member, a torsion spring and an end cover, wherein the output member, the input member, the torsion spring and the end cover are coaxially arranged along the same axis, the end cover is connected to the input member and thereby forms an accommodating space for accommodating the torsion spring and at least a portion of the output member, the torsion spring has a torsion spring body and a first end head extending from the torsion spring body in a radial direction relative to the axial direction and a second end head extending from the torsion spring body in the axial direction, wherein the torsion spring body is tightly wound on at least a portion of the outer circumference of the output member, so that when the input member applies a tangential force relative to the axis on the first end head, the output member can rotate in a first direction, and when a tangential force relative to the axis is applied to the second end head, the output member can rotate in a second direction opposite to the first direction, wherein when the torque transmitted by the transmission device is greater than a threshold value, the torsion spring body slips on at least a portion of the outer circumference of the output member and thereby interrupts the transmission of the torque.

[0009] In the rotating device, the output member is designed to output the torque input by the input member to other components, such as a flip cover, when receiving the torque input by the input member, wherein the driving of the output member is achieved by winding the torsion spring body of the torsion spring around at least a portion of the outer circumference of the output member, so that the two ends of the torsion spring extending from the torsion spring body, namely the first end and the second end, can drive the output member wound by the torsion spring body to rotate when they are respectively subjected to tangential forces. Specifically, for example, when a tangential force relative to the axis (or at least a force having a tangential component) is applied to the first end of the torsion spring, the output member can be rotated in a first direction, and when a tangential force relative to the axis is applied to the second end, the output member can be rotated in a second direction opposite to the first direction.

[0010] Because this torque transmission is based on the torsion spring being wound or gripped around the output member, when an abnormal condition occurs, such as when the torque to be transmitted exceeds a predetermined threshold, the torsion spring can no longer grip the output member, causing relative rotation, or slip, between the two. This interrupts the transmission of torque exceeding the threshold, thereby protecting related components, such as the motor. These abnormal conditions and torque transmission interruptions primarily include the following three scenarios:

[0011] 1. The torque input from the motor, either directly or indirectly through the input member, is too large. In this case, the tangential force on the first or second end of the torsion spring is too large, causing the torsion spring body to slip on the output member, thereby interrupting torque transmission.

[0012] 2. A torque opposite to the currently transmitted torque is input from the output member. For example, in the case of a flip cover, a user may manually close or open a flip cover that is automatically opening. In this case, the first or second end of the torsion spring will abut the corresponding part of the input member, causing the torsion spring to unwind on the output member, thereby interrupting the torque transmission.

[0013] 3. A torque exceeding a threshold, in the same direction as the currently transmitted torque, is input from the output member. For example, in the case of a flip cover, a user may manually open the cover more quickly than it is automatically opening, or close the cover more quickly than it is automatically closing. In this case, the torsion spring body may slip on the output member, interrupting torque transmission.

[0014] In the rotary device according to the present invention, the torsion spring comprises a torsion spring body, a first end extending radially from the torsion spring body relative to the axial direction, and a second end extending axially from the torsion spring body. This design ensures that the second end extending axially from the torsion spring body does not radially extend beyond the outer diameter of the torsion spring. Therefore, when the torsion spring is installed in an input member, there is no need for a slit in the sidewall of the input member to accommodate the radially extending end of the torsion spring. This reduces thin-walled features and significantly improves structural strength.

[0015] In one embodiment, the input member comprises a cylindrical body, with a latching portion formed on the cylindrical wall of the body and a mating latching portion formed on the end cap. The latching portion and the mating latching portion form a form fit, thereby securing the input member and the end cap relative to each other. This form fit between the latching portion and the mating latching portion enables quick and simple assembly without the need for complex tools or additional fasteners, improving assembly efficiency. Furthermore, securing the input member and the end cap solely through their inherent structure makes the entire transmission device more compact and reduces its overall size.

[0016] In one embodiment, a first retaining groove is formed on the cylindrical wall of the main body, extending circumferentially relative to the axis. A bottom is formed on one end of the main body, and a second retaining groove is formed in the bottom, extending circumferentially. A torsion spring is housed within the main body, with a first end portion housed in the first retaining groove and a second end portion housed in the second retaining groove. When the torsion spring main body slides on at least a portion of the outer circumference of the output member, the first end portion and the second end portion can move circumferentially within the first retaining groove and the second retaining groove, respectively. The first retaining groove and the second retaining groove ensure that the first and second ends of the torsion spring are accurately positioned, preventing them from shifting or falling off during operation of the transmission device, thereby helping to maintain the stability and reliability of the transmission device. In addition, the design of providing the first retaining groove on the cylindrical wall of the input member main body and the second retaining groove in the bottom of the input member main body simultaneously achieves the functions of accommodating the torsion spring and limiting the ends of the torsion spring through the input member main body, making the entire transmission device more compact and reducing unnecessary space occupation. In addition, in the torque interrupted operating state, when the radially extending first end of the torsion spring contacts the side wall of the first retaining groove, the axially extending second end of the torsion spring should disengage from the second retaining groove to avoid the torsion spring being unable to loosen.

[0017] In one embodiment, the dimension of the first retaining groove in the axial direction is smaller than the dimension of the torsion spring in the axial direction. This design greatly reduces the risk of the input member having reduced structural strength due to an excessively long slit in the axial direction.

[0018] In one embodiment, the output member comprises a shaft and a cylindrical component, wherein the shaft is received and secured within the cylindrical component, with the outer circumference of the cylindrical component constituting at least a portion of the outer circumference of the output member. This design of the output member consisting of a shaft and cylindrical component reduces maintenance costs, as damaged components can be replaced individually. Furthermore, by selecting shaft and cylindrical components of varying sizes and materials, the output member can be adapted to various application scenarios, enhancing design flexibility and applicability.

[0019] In one embodiment, a notch is provided on one axial end of the cylindrical wall of the cylindrical component, and the output member is configured with a flange portion having a first latching protrusion. The end of the cylindrical component with the notch abuts against the flange portion, and the notch and the first latching protrusion are form-fitted, thereby circumferentially securing the cylindrical component and the output member relative to each other. The flange portion further includes an annular groove for accommodating the cylindrical wall adjacent to the notch of the cylindrical component. This design allows for a more stable engagement between the cylindrical component and the output member, and the relatively simple circumferential securing of the cylindrical component to the first component also contributes to a compact design of the entire transmission device.

[0020] In one embodiment, the cylindrical component has an abutment portion at its other end in the axial direction, and a first annular portion is formed in the bottom of the main body of the input member. The abutment portion abuts against the first annular portion, thereby securing the cylindrical component axially between the output member and the input member. This design allows the cylindrical component, or in other words, the torsion spring, to be easily secured axially between the output member and the input member.

[0021] In one embodiment, a second annular portion is formed on the end cap. The side of the output member's flange facing the end cap engages with the second annular portion to limit the position of the end cap and the output member during relative rotation. In this design, the friction generated by the fully circular second annular portion and the fully circular flange when rotating against each other is low, thereby slowing wear of the two components.

[0022] In one embodiment, the latching portion is configured as a third latching groove and the mating latching portion is configured as a second latching protrusion, wherein the two circumferentially facing side walls of the second latching protrusion are configured to be inclined at a first inclination angle relative to the radial direction and radially inwardly approach each other, and the two circumferential side walls of the third latching groove opposite the two side walls of the second latching protrusion are configured to be inclined at a second inclination angle relative to the radial direction and radially outwardly move away from each other. This design avoids the difficulty of disassembling the input member and the end cover by prying or lifting them apart due to their small size. According to the utility model, quick disassembly of the input member and the end cover is achieved by simply twisting the end cover or the input member, and the second latching protrusion can slide out of the third latching groove along the inclined side walls, thereby quickly releasing the mutual fixation between the input member and the end cover.

[0023] In one embodiment, the first inclination angle and the second inclination angle are designed to be equal, so that the two circumferentially facing side walls of the second retaining protrusion form surface contact when they collide with the corresponding side walls of the third retaining groove, reducing component deformation and thereby improving structural strength.

[0024] In one embodiment, the torsion spring is formed of a wire with a square cross section. Compared to a wire with a round cross section, a wire with a square cross section can contact the input member or the cylindrical component with a larger contact surface, which is beneficial for stable torque transmission.

[0025] In one embodiment, the output member is configured with a gear portion for transmitting torque to other components, wherein the gear portion is configured to be integral with or separate from the output member. Advantageously, when the gear portion is configured to be separate from the output member, the two can be made of different materials, for example, the gear portion can be made of metal and the output member or its shaft can be made of plastic.

[0026] In one embodiment, the input member is configured with a gear portion for transmitting torque to other components, wherein the first retaining groove is at least partially offset from the gear portion in the axial direction. This reduces the thin-walled feature at the gear portion, so that the strength at this location is not reduced by the provision of the first retaining groove.

[0027] In one embodiment, the output member is provided with a first axial hole coaxial with the axis, the input member is provided with a second axial hole coaxial with the axis, and the transmission device further comprises a support shaft extending through the first and second axial holes to rotatably support the output member and the input member. The support shaft extends through the axial holes of the output member and the input member and cooperates with the rotation of the output member and the input member, respectively, thereby eliminating cumulative matching errors and thereby improving transmission accuracy.

[0028] In one embodiment, the tubular component and the torsion spring are made of metal, thereby reducing the wear of the torsion spring caused by clasping or relative sliding on the outer circumference of the tubular component and improving its service life.

[0029] The utility model further relates to a flip cover machine, which comprises a housing. A motor and a transmission mechanism are accommodated in the housing. The transmission mechanism has a transmission device according to the utility model or an optional advantageous design thereof.

[0030] The utility model also relates to a toilet, which is provided with a toilet cover and a flapper capable of driving the toilet cover to open and close. The flapper can be designed as the flapper according to the utility model.

[0031] The advantageous designs and advantages of the flap machine and toilet according to the present invention can be referred to the advantageous designs and advantages described for the transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The preferred embodiments of the present invention are explained in more detail below with reference to the accompanying drawings, wherein:

[0033] Figure 1 Showing a side perspective view and an axial cross-sectional view of a transmission device according to the present invention,

[0034] Figure 2 Showing an exploded view of the transmission device according to the present invention,

[0035] Figure 3 A perspective view showing a portion of an output member of a transmission device according to the present invention from both axial sides,

[0036] Figure 4 A perspective view showing the cylindrical component of the output member of the transmission device according to the present invention from both axial sides,

[0037] Figure 5A side view and a perspective view of a torsion spring of a transmission device according to the present invention are shown,

[0038] Figure 6 Showing an overall perspective view and a partially cutaway perspective view of an input member of a transmission device according to the present invention,

[0039] Figure 7 A perspective view showing the input member of the transmission device according to the present invention together with the torsion spring contained therein and the support shaft from both axial sides,

[0040] Figure 8 Showing an overall perspective view and a partially cutaway perspective view of an end cover of a transmission device according to the present invention,

[0041] Figure 9 A side view of the end cap of the transmission device according to the present invention (the circle above shows an enlarged view of the inclined structure of the engaging locking portion) and a side view of the input member (the circle above shows an enlarged view of the inclined structure of the locking portion), as well as a partial cross-sectional view of the assembled state of the two, are shown.

[0042] Figure 10 The following shows a case where the transmission device according to the present invention is used in a flip-top machine. DETAILED DESCRIPTION

[0043] Figure 1 FIG. 1 shows a transmission device 1 according to the present invention, which includes an output member 2, an input member 3, a torsion spring 5 and an end cover 6. Figure 1 and Figure 2 As shown, the output member 2, the input member 3, the torsion spring 5 and the end cover 6 are coaxially arranged along the same axis. The end cover 6 is connected to the input member 3 and thus forms an accommodating space for accommodating the torsion spring 5 and at least a portion of the output member 2. Figure 8 As shown, a hole 63 is further formed on the end cover 6 , and another part of the output member extends out from the end cover 6 through the hole 63 .

[0044] like Figure 5 As shown, the torsion spring 5 comprises a torsion spring body 51, a first end 52 extending from the torsion spring body 51 in a radial direction relative to the axial direction, and a second end 53 extending from the torsion spring body 51 in the axial direction. The torsion spring body 51 is wound tightly around at least a portion of the outer circumference of the output member 2, so that the input member 3 is Figure 2 When a tangential force relative to the axis is applied to the torsion spring 5 in the exploded view of FIG, the output member 2 can be rotated in the first direction and at the second end 53 ( Figure 2When a tangential force relative to the axis is applied to the torsion spring body 51 (i.e., the right end of the torsion spring 5 in the exploded view), the output member 2 can be rotated in a second direction opposite to the first direction. When the torque transmitted by the transmission device 1 exceeds a threshold, the torsion spring body 51 slides on at least a portion of the outer circumference of the output member 2, thereby interrupting the transmission of torque.

[0045] Figure 5 The torsion spring 5 shown in FIG is made of a wire with a circular cross section. However, it can preferably be made of a wire with a square cross section, which can increase the friction surface and facilitate torque transmission.

[0046] like Figure 3 It can be seen that the output member 2 is designed to have a shaft portion 26, and the torsion spring body 51 can be directly tightened on the shaft portion 26. Of course, preferably, the output member 2 can have Figure 4 The cylindrical member 4 shown in FIG. 1 has the shaft portion 26 of the output member 2 accommodated and fixed therein. In this case, the outer circumference of the cylindrical member 4 constitutes at least a portion of the outer circumference of the output member 2. As a result, the cylindrical member 4 and the torsion spring 5 can be designed to be made of a stronger material, such as metal, to reduce wear caused by relative movement between the two.

[0047] from Figure 3 It can also be seen that the output member 2 is designed with a gear portion 25 for transmitting torque to other components. The gear portion shown in the figure is directly integrated on the output member 2 and forms an integral component therewith. Of course, it is also conceivable that the gear portion is composed of a separate component and connected to the output member 2.

[0048] Combine Figure 3 and Figure 4 It can be seen that a notch 41 is provided on one end of the cylindrical wall of the cylindrical component 4 in the axial direction, and the output member 2 is constructed with a flange 22 with a first locking protrusion 21. The end of the cylindrical component 4 with the notch 41 abuts against the flange 22, and the notch 41 and the first locking protrusion 21 are shaped to match each other, thereby fixing the cylindrical component 4 and the output member 2 relative to each other in the circumferential direction. The flange 22 is also provided with an annular groove 23 adjacent to the first locking protrusion 21 to accommodate the cylindrical wall next to the notch 41 of the cylindrical component 4. Figure 8 As can be seen in the figure, a second annular portion 62 is constructed on the end cover 6, and the side of the flange portion 22 of the output member 2 facing the end cover 6 cooperates with the second annular portion 62 to limit the end cover 6 and the output member 2 when the two rotate relative to each other.

[0049] The cylindrical member 4 has an abutment portion 42 at the other end in the axial direction, which is designed to engage with the first annular portion 34 (see FIG. Figure 6), the abutting portion 42 can abut against the first annular portion 34, and the cylindrical component 4 is thereby fixed between the output member 2 and the input member 3 in the axial direction.

[0050] like Figure 6 、 Figure 7 As shown, the input member 3 has a cylindrical body, a locking portion 31 is constructed on the cylindrical wall 36 of the body, and a matching locking portion 61 is constructed on the end cover 6. The locking portion 31 and the matching locking portion 61 are form-fitted and thereby fix the input member 3 and the end cover 6 relative to each other. The form-fitting method can be achieved through different designs. For example, the locking portion 31 can be constructed as a third locking groove and the matching locking portion 61 can be constructed as a second locking protrusion. For this, refer to Figure 9 , which shows, from left to right, a side view of the mating stopper 61 of the end cover, a side view of the stopper 31 of the input member, and a partial cross-sectional view of the assembled state of the end cover and the input member. Figure 9 In the illustrated embodiment, the two circumferentially facing side walls of the second retaining protrusion on the end cap 6 are inclined at a first inclination angle α relative to the radial direction and radially inwardly approach each other (see the partially enlarged view above the end cap 6). The two circumferential side walls of the third retaining groove, opposite the two side walls of the second retaining protrusion, are inclined at a second inclination angle β relative to the radial direction and radially outwardly move away from each other (see the partially enlarged view above the input member 3). This design has the advantage that if the end cap and input member are to be disassembled, they can be conveniently separated from their assembled state by twisting the two components together. Preferably, the first inclination angle α and the second inclination angle β are designed to be equal, so that surface contact is established between the two, reducing component deformation and thereby improving structural strength.

[0051] Furthermore, a first retaining groove 32 extending circumferentially relative to the axis is formed on the cylindrical wall 36 of the main body. A bottom is formed on one end side of the main body, and a second retaining groove 33 extending circumferentially is formed in the bottom. The main body of the input member 3 shown in the figure is provided with two first retaining grooves 32 and two second retaining grooves 33. The torsion spring 5 is housed within the main body, with the first end 52 accommodated in the first retaining groove 32 and the second end 53 accommodated in the second retaining groove 33. When the torsion spring body 51 slides on at least a portion of the outer circumference of the output member 2, the first end 52 and the second end 53 can move circumferentially within the first retaining groove 32 and the second retaining groove 33, respectively. For example, under normal circumstances, when torque is transmitted from the input member 3 to the output member 2, the input member 3 compresses the first end 52 or the second end 53 via the corresponding sidewalls of the first retaining groove 32 or the second retaining groove 33, depending on the direction of rotation, allowing the output member 2, which is held by the torsion spring body of the torsion spring 5, to rotate in a first direction or a second, opposite direction. Under abnormal circumstances, the corresponding sidewalls of the first retaining groove 32 or the second retaining groove 33 can compress the first end 52 or the second end 53 in a direction that unwinds the torsion spring body 51, thereby interrupting torque transmission.

[0052] Depend on Figure 7 As can be seen from the left side view in FIG, the dimension of the first retaining groove 32 in the axial direction is smaller than the dimension in the axial direction of the torsion spring 5. This avoids providing a groove over the entire length of the side wall of the cylindrical body and causing the wall strength to decrease.

[0053] As can be seen from the figure, the input member 3 is designed with a gear portion 37 for transmitting torque to other components. In order to avoid the first retaining groove 32 from reducing the strength of the gear portion 37, the first retaining groove 32 can be at least partially offset from the gear portion 37 in the axial direction. Figure 6 As shown, the first locking groove 32 is completely offset from the gear portion 37 in the axial direction.

[0054] like Figure 1-Figure 3 、 Figure 6 As shown, a first axial hole 24 coaxial with the axis is arranged on the output member 2, and a second axial hole 35 coaxial with the axis is arranged on the input member 3. The transmission device 1 also has a support shaft 7, which passes through the first axial hole 24 and the second axial hole 35 to rotatably support the output member 2 and the input member 3.

[0055] Figure 10The figure shows a transmission device 1 according to the present invention applied to a flip phone. The left side of the figure shows the housing, which houses the motor and transmission mechanism. Components extending from the housing connect to the flip cover (not shown) to open and close it. The right side view shows the housing removed, revealing that the input component of the transmission device 1 is connected to the output shaft of the motor, while the output component of the transmission device 1 is connected to other components and ultimately outputs torque to the flip cover.

[0056] Although the present invention has been described in detail through preferred embodiments, the present invention is not limited to the disclosed embodiments, and technicians can derive other variant design solutions by combining the technical features mentioned in this specification without departing from the scope of protection of the present invention.

Claims

1. A transmission device (1), comprising an output member (2), an input member (3), a torsion spring (5) and an end cover (6), wherein: The output member (2), the input member (3), the torsion spring (5) and the end cover (6) are coaxially arranged along the same axis, characterized in that the end cover (6) is connected to the input member (3) and thereby forms an accommodating space for accommodating the torsion spring (5) and at least a portion of the output member (2), the torsion spring (5) having a torsion spring body (51) and a first end head (52) extending from the torsion spring body (51) in a radial direction relative to the axial direction and a second end head (53) extending from the torsion spring body (51) in the axial direction, wherein the torsion spring body (51) is wound tightly on at least part of the outer circumference of the output member (2), so that the input member (3) can rotate the output member (2) in a first direction when a tangential force relative to the axis is applied by the first end (52) and can rotate the output member (2) in a second direction opposite to the first direction when a tangential force relative to the axis is applied on the second end (53), wherein when the torque transmitted by the transmission device (1) is greater than a threshold value, the torsion spring body (51) slips on at least part of the outer circumference of the output member (2) and thereby interrupts the transmission of the torque.

2. The transmission device (1) according to claim 1, characterized in that The input member (3) has a cylindrical main body, a locking portion (31) is constructed on the cylindrical wall (36) of the main body, and a matching locking portion (61) is constructed on the end cover (6). The locking portion (31) and the matching locking portion (61) are matched in shape and thereby fix the input member (3) and the end cover (6) relative to each other.

3. The transmission device (1) according to claim 2, characterized in that A first retaining groove (32) extending in the circumferential direction relative to the axis is constructed on the cylindrical wall (36) of the main body, a bottom is constructed on one end side of the main body and a second retaining groove (33) extending in the circumferential direction is constructed in the bottom, the torsion spring (5) is accommodated inside the main body and the first end head (52) is accommodated in the first retaining groove (32) and the second end head (53) is accommodated in the second retaining groove (33), when the torsion spring main body (51) slides on at least a part of the outer peripheral surface of the output member (2), the first end head (52) and the second end head (53) can move circumferentially in the first retaining groove (32) and the second retaining groove (33) respectively.

4. The transmission device (1) according to claim 3, characterized in that The dimension of the first retaining groove (32) in the axial direction is smaller than the dimension of the torsion spring (5) in the axial direction.

5. The transmission device (1) according to claim 2, characterized in that The output member (2) includes a shaft portion (26) and a cylindrical member (4), and the shaft portion (26) of the output member (2) is accommodated and fixed in the cylindrical member (4), and the outer peripheral surface of the cylindrical member (4) constitutes at least a part of the outer peripheral surface of the output member (2).

6. The transmission device (1) according to claim 5, characterized in that A notch portion (41) is provided on one end of the cylindrical wall of the cylindrical component (4) in the axial direction, and the output member (2) is constructed with a flange portion (22) having a first locking protrusion (21). One end of the cylindrical component (4) provided with the notch portion (41) abuts against the flange portion (22) and the notch portion (41) is shaped to match the first locking protrusion (21), thereby fixing the cylindrical component (4) and the output member (2) relative to each other in the circumferential direction, wherein the flange portion (22) is further provided with an annular groove (23) for accommodating the cylindrical wall next to the notch portion (41) of the cylindrical component (4).

7. The transmission device (1) according to claim 6, characterized in that The cylindrical component (4) has a supporting portion (42) at the other end in the axial direction, and a first annular portion (34) is constructed in the bottom of the main body of the input member (3). The supporting portion (42) abuts against the first annular portion (34), and the cylindrical component (4) is thereby fixed between the output member (2) and the input member (3) in the axial direction.

8. The transmission device (1) according to claim 7, characterized in that A second annular portion (62) is formed on the end cover (6), and a side of the flange portion (22) of the output member (2) facing the end cover (6) cooperates with the second annular portion (62) to limit the position of the end cover (6) and the output member (2) when the two rotate relative to each other.

9. The transmission device (1) according to claim 2, characterized in that The locking portion (31) is configured as a third locking groove and the mating locking portion (61) is configured as a second locking protrusion, wherein the two circumferentially facing side walls of the second locking protrusion are configured to be inclined at a first inclination angle relative to the radial direction and radially inwardly approach each other, and the two circumferential side walls of the third locking groove opposite to the two side walls of the second locking protrusion are configured to be inclined at a second inclination angle relative to the radial direction and radially outwardly move away from each other.

10. The transmission device (1) according to claim 9, characterized in that The first inclination angle and the second inclination angle are designed to be equal.

11. The transmission device (1) according to claim 1, characterized in that The torsion spring (5) is composed of a wire with a square cross section.

12. The transmission device (1) according to claim 1, characterized in that The output member (2) is designed with a gear portion for transmitting torque to other components, wherein the gear portion is designed to be integral with or separate from the output member.

13. The transmission device (1) according to claim 3, characterized in that The input member (3) is designed with a gear portion (37) for transmitting torque to other components, wherein the first retaining groove (32) is at least partially offset from the gear portion (37) in the axial direction.

14. The transmission device (1) according to claim 1, characterized in that The output member (2) is provided with a first axial hole (24) coaxial with the axis, the input member (3) is provided with a second axial hole (35) coaxial with the axis, and the transmission device (1) further comprises a support shaft (7) passing through the first axial hole (24) and the second axial hole (35) so as to rotatably support the output member (2) and the input member (3).

15. The transmission device (1) according to claim 5, characterized in that The cylindrical component and the torsion spring are designed to be made of metal.

16. A flip phone having a housing, wherein a motor and a transmission mechanism are housed in the housing, wherein: The transmission comprises a transmission device (1) according to one of the preceding claims 1 to 15.

17. A toilet with a toilet lid and a lid-opening mechanism capable of driving the toilet lid to open and close, characterized in that: The flip phone is the flip phone according to claim 16.

Images