A motor assembly for a clothes dryer

Abstract

The application discloses a motor assembly for a clothes dryer, comprising a rack, a double-shaft motor, a transmission mechanism, a retreat-stop mechanism, a ratchet switching mechanism, a multi-stage speed regulation mechanism and an output wheel. The first output end of the double-shaft motor is directly connected with a fan, and the second output end is connected with a driving wheel, a driven wheel and a conveying belt to form a first-stage speed reduction. The retreat-stop mechanism locks the driven wheel when the motor reverses, so that the conveying belt slips. The ratchet switching mechanism comprises a first ratchet component, a second ratchet component and a sleeve component. The slipping during the motor reversal drives a swing lever, and the sleeve is reversely rotated through the cooperation of ratchet teeth. The fixed and movable rotating ratchets of the second ratchet component are connected through spiral ladder clamping claws, so that rotation is converted into axial transition. The multi-stage speed regulation mechanism pushes a planetary gear carrier through a movable rotating ratchet, so that different levels of planetary gears are engaged with corresponding gear rings, multi-stage speed regulation is realized, and finally the output wheel is driven to rotate at variable speed. The application realizes automatic switching and multi-stage speed regulation through motor reversal, and improves the performance and energy efficiency of the clothes dryer.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and in particular to a motor assembly for a clothes dryer. Background Technology

[0002] As a common household appliance, the core function of a clothes dryer is to efficiently dry clothes through the combined action of hot air and tumbling. Most mainstream clothes dryers currently use a drum-type structure, and their working principle relies primarily on two key actions: first, driving the drum to rotate, causing the clothes inside to tumble and disperse, thereby increasing the contact area with the hot air; second, driving the fan to operate, forcing heated air into the drum to form a high-temperature, low-humidity airflow that removes moisture from the clothes.

[0003] To achieve the above functions, a single-motor drive scheme is commonly used in existing technologies. Specifically, this scheme includes a motor assembly with a motor shaft extending from the center, its two ends extending to the outside of the motor. One end of the motor shaft is directly or indirectly connected to drive a fan to generate the airflow required for drying; the other end of the motor shaft is connected to and drives the dryer's drum via a transmission mechanism such as a belt and pulleys. In this way, with only one set of stator and rotor, a single motor can simultaneously power both the fan's airflow function and the drum's rotation function. This design simplifies the structure and reduces manufacturing costs to some extent.

[0004] However, this single-motor drive scheme has an inherent drawback: because the fan and drum share the same power source and are transmitted through a fixed mechanical structure, there is an unchangeable fixed transmission ratio between their speeds. This means that during use, the drum speed and fan speed are forcibly bound together, and cannot be independently and flexibly adjusted according to actual drying needs. For example, delicate fabrics such as silk and wool require a low-speed, gentle drying mode (i.e., the drum rotates at a low speed, but may require a large volume of low-temperature air to quickly remove moisture); while heavy fabrics such as cotton and linen require a high-speed, powerful drying mode (i.e., the drum rotates at high speed to tumble the clothes, combined with high temperature and large air volume). The fixed speed ratio of existing technology cannot meet these diverse and refined drying needs, resulting in poor drying effects and even potential damage to clothing.

[0005] To overcome the limitations of a fixed speed ratio, existing technology proposes a solution using a dual-motor system, independently driving the drum and fan respectively. While this solution achieves independent control of drum speed and fan speed, greatly improving the flexibility of drying modes, it also introduces new and more challenging technical problems. First, adding a motor and its corresponding control system significantly increases material and production costs, hindering market competitiveness. Second, within the limited installation space inside the dryer, adding an extra motor and its transmission components poses a significant challenge to the overall structural layout and compact design, often resulting in increased product size or sacrificing the performance space of other components.

[0006] Therefore, there is an urgent need in this field for an innovative drive solution that can achieve independent and flexible adjustment of the drum and fan speeds to adapt to the drying needs of clothes made of different materials, while avoiding the problems of high cost and excessive space occupation caused by dual-motor systems. Summary of the Invention

[0007] The purpose of this invention is to provide a motor assembly for a clothes dryer that enables variable switching between fan speed and drum speed using a single motor.

[0008] To achieve the above objectives, the present invention provides the following technical solution: The purpose of this invention is to overcome the shortcomings of the prior art and provide a motor assembly for a clothes dryer with an ingenious structure that can achieve multi-level speed regulation by using a single motor to rotate forward and backward.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A motor assembly for a clothes dryer includes a frame, a dual-axis motor, a transmission mechanism, a backstop mechanism, a motion conversion mechanism, a transmission ratio switching unit, and an output wheel. The dual-axis motor is fixed to the frame, with its first output end driving a fan and its second output end connected to the transmission mechanism. The transmission mechanism includes a driving wheel, a driven wheel, and a conveyor belt. The driving wheel is coaxially connected to the second output end, and the driven wheel is rotatably mounted on the frame. The two are driven together by the conveyor belt. The backstop mechanism is mounted on the frame and prevents the driven wheel from reversing when the dual-axis motor reverses.

[0010] The key feature of this invention is that it also includes: The motion conversion mechanism, located on the driven wheel, converts the relative sliding between the conveyor belt and the driven wheel into its own axial leap when the dual-axis motor reverses.

[0011] The transmission ratio switching unit is driven and connected to the motion conversion mechanism, and includes multiple sets of gear pairs with different transmission ratios; the transmission ratio switching unit responds to the axial transition of the motion conversion mechanism and switches to different gear pair meshing for power transmission.

[0012] The output wheel has its input section slidably inserted into the transmission ratio switching unit so as to rotate synchronously with the switched gear pair.

[0013] Preferably, the motion conversion mechanism includes a ratchet switching mechanism, which further includes a sleeve component, a first ratchet component, and a second ratchet component. The sleeve component is rotatably mounted in the driven wheel. The first ratchet component is used to synchronously rotate the sleeve and the driven wheel in the forward direction when the motor rotates forward, and to convert the driving force of the conveyor belt into the rotation of the sleeve when the motor rotates in the reverse direction. The second ratchet component is used to convert the rotation of the sleeve into the axial transition motion of the drive transmission ratio switching unit.

[0014] As a further preferred embodiment, the first ratchet component includes a flip-up lever, and the inner surface of the conveyor belt is provided with a groove adapted to the lever. When the driven wheel is locked, the lever is inserted into the groove and flipped up by the moving conveyor belt, thereby driving the entire switching process.

[0015] As a further preferred embodiment, the transmission ratio switching unit is a multi-stage speed regulation mechanism, employing a planetary gear system structure, including a ring gear carrier, a planetary gear carrier, multiple layers of planetary gears, and multiple sun gears. Through the axial movement of the planetary gear carrier, different levels of planetary gears mesh with the ring gear, thereby changing the transmission path and transmission ratio.

[0016] The beneficial effects of this invention are as follows: 1. By cleverly utilizing the relative slippage between the belt and the driven pulley when the motor reverses, the slippage is converted into axial displacement through a motion conversion mechanism, thereby achieving automatic switching of the transmission ratio. Multiple speed settings can be achieved with just the forward and reverse control of a single motor, eliminating the need for multiple motors or expensive electronically controlled clutches.

[0017] 2. Compact and reliable structure: The entire speed control system is integrated between the driven wheel and the output wheel, resulting in a compact structure and high space utilization. The ratchet and planetary gears used are all mature components in the mechanical field, ensuring reliable operation and long service life.

[0018] 3. Simple control logic: No complex control program is required. Power is output when the motor rotates forward (and the current gear can be maintained), and gear shifting is triggered when the motor rotates in reverse. The control system is simple and reliable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a longitudinal sectional view of the motion conversion mechanism of the present invention; Figure 3 This is a cross-sectional view of the motion conversion mechanism of the present invention; Figure 4 This is an exploded view of the invention after removing the frame and the dual-axis motor; Figure 5 yes Figure 4 Combined longitudinal sectional view; Figure 6 This is a partial sectional view of the driven wheel; Figure 7 This is a schematic diagram of the driven wheel; Figure 8 This is a partial cross-sectional view of the ratchet structure; Figure 9 This is a magnified view of a section marked I; Figure 10 This is a magnified view of a section marked II; Figure 11 This is a magnified view of a section marked III; Figure 12 This is a magnified view of a section marked IV.

[0020] Reference numerals: 1. Frame; 2. Dual-axis motor, 21. First output terminal, 22. Second output terminal; 3. Transmission mechanism, 31. Driving wheel, 32. Driven wheel, 321. Mounting groove A, 322. Mounting groove B, 33. Conveyor belt, 331. Groove; 4. Anti-reverse mechanism; 41. Solenoid valve; 42. Stop block; 5. Motion conversion mechanism; 51. Sleeve assembly, 51a. First end, 51b. Second end, 511. Mounting groove C, 512. Mounting groove D; 52. First ratchet assembly, 521. Movable ratchet A, 522. Elastic element A, 523. Movable ratchet B, 524. Elastic element B, 525. Fixed ratchet B, 526. Ratchet structure, 5261. Eccentric wheel, 5262. Fixed ratchet A, 5263. Rocker arm, 527. Torsion spring; 53. Second ratchet assembly, 531. Fixed rotating ratchet, 5311. Claw A, 532. Movable rotating ratchet, 5321. Claw B, 533. Guide post, 5331. Slide groove, 534. Slider, 535. Elastic element C; 6. Transmission ratio switching unit; 61. Gear ring carrier; 611. Gear ring; 62. Planetary gear carrier; 63. Planetary gear; 64. Sun gear; 7. Output wheel, 71. Body, 72. Prism. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. In this invention, counterclockwise rotation is considered forward rotation, and clockwise rotation is considered reverse rotation.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Figures 1-12 As shown, a motor assembly for a clothes dryer includes a frame 1, a dual-shaft motor 2, a transmission mechanism 3, a backstop mechanism 4, a motion conversion mechanism 5, a transmission ratio switching unit 6, and an output wheel 7.

[0025] The dual-axis motor 2 is fixed on the frame 1 to connect with the dryer body. It has a first output end 21 and a second output end 22. The first output end 21 serves as a high-speed shaft and is directly connected to a fan (not shown) to deliver hot air to the dryer drum.

[0026] The second output end 22 is connected to the driving wheel 31 of the transmission mechanism 3. The driven wheel 32 of the transmission mechanism 3 is rotatably mounted on the frame 1 via bearings, and the driving wheel 31 and the driven wheel 32 are connected by a rubber conveyor belt 33. As a first-stage reduction, the diameter of the driving wheel 31 is smaller than the diameter of the driven wheel 32 to achieve the effect of initial speed reduction transmission.

[0027] The anti-reverse mechanism 4 includes a solenoid valve 41 mounted on the frame 1 and a stop block 42 disposed on the end face of the driven wheel 32. When the dual-shaft motor 2 reverses, the solenoid valve 41 is energized, and its valve stem extends and abuts against the stop block 42, preventing the driven wheel 32 from reversing. At this time, relative sliding occurs between the conveyor belt 33 and the driven wheel 32.

[0028] The core of this invention lies in the motion conversion mechanism 5 and the transmission ratio switching unit 6. For example... Figures 5 to 12As shown, the motion conversion mechanism 5 is specifically a switching structure that achieves unidirectional drive via a ratchet, with the sleeve component 51 as its switching transmission core. The driven wheel 32 has an annular mounting groove A321 and multiple circumferentially distributed mounting grooves B322 coaxially arranged on it. The sleeve component 51 is rotatably mounted in the mounting groove A321. It should be noted that in some specific embodiments, the number of mounting grooves B322 is three, to ensure that the conveyor belt 33 wound around the driven wheel 32 is in contact with at least one set of ratchet structures 526 mounted in the mounting grooves B322.

[0029] like Figure 5 As shown, the first ratchet component 52 is responsible for power input and direction determination. It includes a movable ratchet A521 and an elastic element A522. The movable ratchet A521 and the elastic element A522 are radially disposed in the mounting groove C511 of the first end 51a of the sleeve component 51, and the movable ratchet A521 extends radially out of the sleeve component 51 under the action of the elastic element A522.

[0030] The first ratchet component 52 also includes a movable ratchet B523 and an elastic element B524. The movable ratchet B523 and the elastic element B524 are disposed in the mounting groove D512 of the first end 51a of the sleeve component 51, and the movable ratchet B523 extends out to the outside of the first end 51a along the axial direction of the sleeve component 51 under the action of the elastic element B524.

[0031] In addition, several fixing ratchet teeth B525 are arranged in a ring at the bottom of the mounting slot A321.

[0032] like Figure 6 , Figure 7 As shown, a ratchet structure 526 is provided in the mounting slot B322. This ratchet structure 526 is elastically hinged to the driven wheel 32 via a torsion spring 527, and the torsion spring 527 continuously applies torque to the ratchet structure 526 to give it a clockwise rotation tendency. In this design, the ratchet structure 526 is an eccentric wheel 5261, with a fixed ratchet tooth A5262 on its long axis rim, so that after the eccentric wheel rotates, the fixed ratchet tooth A5262 can engage with the movable ratchet tooth A521 on the sleeve component 51. A rocker arm 5263 extends from the rim of the eccentric wheel 5261, leaning towards the direction of the driven wheel's clockwise (counter-clockwise) rotation. Under the action of the torsion spring 527, the rocker arm 5263 has a tendency to fold outwards.

[0033] Dual-axis motor forward (counter-clockwise) rotation workflow: When the dual-axis motor 2 rotates forward, it drives the drive wheel 31 to rotate synchronously. The driven wheel 32, driven by the conveyor belt 33, rotates synchronously forward in the same direction as the drive wheel 31. At this time, the fixed ratchet B525 pushes the movable ratchet B523, thereby driving the sleeve component 51 to rotate forward as well. At this time, the rocker arm 5263 in the ratchet structure 526 is pressed back into the mounting groove B322 by the conveyor belt 33, and will not hinder the normal operation of the conveyor belt 33 and the driven wheel 32. At this time, the fixed ratchet A5262 does not interfere with the movable ratchet A.

[0034] Dual-axis motor reverse (clockwise) triggering process: Solenoid valve 41 actuates, locking driven wheel 32. Conveyor belt 33 begins to slip relative to driven wheel 32. The groove 331 on the inner surface of the slipping conveyor belt 33 hooks onto the free end of the fallen rocker arm 5263 and flips it up. The flipped rocker arm 5263 drives the entire eccentric wheel 5261 to rotate around its hinge point, causing its long axis, which is equipped with fixed ratchet A5262, to rotate towards the position of the movable ratchet A521 on the sleeve component 51, and thus engage with the radially protruding movable ratchet A521 on the sleeve component 51. The conveyor belt 33 continues to move, driving the sleeve component 51 to rotate "forward" (i.e., counterclockwise) relative to the locked driven wheel 32 through the rocker arm 5263 and the movable ratchet A521.

[0035] It should be noted that in the above working mode, the groove 331 also serves to ensure stable operation of the drive wheel 32 and the conveyor belt 33 when the dual-shaft motor reverses. Specifically, the drive wheel 31 is provided with teeth that are adapted to the groove 331, while the rim of the driven wheel 32 has a smooth surface.

[0036] It should also be noted that the second ratchet component 53 is responsible for converting rotation into axial transition. For example... Figures 4 to 6 As shown, the second ratchet component 53 includes a fixed rotating ratchet 531, which is fixedly mounted on the second end 51b of the sleeve component 51, and has a pawl A5311 on it. Figure 4 As shown, the chuck A5311 has a guide ramp that gradually rises in a clockwise direction.

[0037] like Figures 5 to 6 as well as Figure 9As shown, the second ratchet component 53 also includes a movable rotating ratchet 532, which is fixedly connected to the planetary gear carrier 62 of the transmission ratio switching unit 6. Its end face is provided with pawls B5321 arranged in a spiral stepped pattern. It should be noted that through the rotation of pawl A5311, pawl A5311 can sequentially enter the next pawl B5321. When switching the pawl B5321 opposite to pawl A5311, because the contact surface between adjacent pawl B5321 and pawl A5311 undergoes an axial height change, the movable rotating ratchet 532 can undergo an axial jump.

[0038] like Figure 4 , Figure 11 As shown, the second ratchet component 53 also includes a reset elastic unit, which includes a guide post 533, a slider 534, and an elastic element C535. The guide post 533 is fixed to the driven wheel 32 and extends along the axial direction of the driven wheel 32. The slider 534 is fixed on the movable rotating ratchet 532 and slidably disposed in the groove 5331 of the guide post 533. The elastic element C535 provides an elastic reset force that tends to cause the movable rotating ratchet 532 to abut against the fixed rotating ratchet 531.

[0039] When the sleeve component 51 rotates, it drives the fixed rotating ratchet 531 to rotate. The pawl A5311 interacts with the spiral stepped pawl B5321, overcoming the elastic force of the elastic element C535, and pushing the movable rotating ratchet 532 to jump axially.

[0040] like Figure 1 , Figure 4 as well as Figure 9As shown, the transmission ratio switching unit 6 is a multi-stage speed regulation mechanism. It includes a gear ring carrier 61 fixed to the guide post 533, which contains multiple axially arranged gear rings 611. The specific number of gear rings 611 is equal to the number of pawls B5321 in each pawl group. Furthermore, the number of teeth on the gear rings 611 gradually increases from the side closer to the driven wheel 32 to the side farther away from the driven wheel 32. Simultaneously, the transmission ratio switching unit 6 also includes a planetary gear carrier 62, which is connected to the movable rotating ratchet 532 to maintain the synchronicity of axial movement. It should also be noted that the movable rotating ratchet 532 and the planetary gear carrier 62 are rotatably connected to ensure that the planetary gear carrier 62, while being driven, avoids driving the movable rotating ratchet 532 to rotate synchronously. In this design, the planetary gear carrier 62 is equipped with multiple layers of planetary gears 63. Meanwhile, multiple sun gears 64 are also arranged in the middle of the planetary gear carrier 62, each sun gear 64 corresponding to and meshing with a layer of planetary gears 63. It should be noted that in this design, by driving the planetary gear carrier 62 to move axially, one layer of planetary gears 63 can be made to mesh with the external ring gear 611. Furthermore, in this design, different transmission ratios can be adjusted simply by adjusting the number of teeth on the ring gear 611, planetary gears 63, and sun gears 64.

[0041] like Figure 5 As shown, the input section of the output wheel 7 is a prism 72, which slides through all the sun gears 64. This prism 72 maintains synchronous rotation with the sun gears while avoiding obstruction of the axial movement of the planetary gear carrier 62 and the sun gears 64. It should be noted that the inner end of the prism 72 is rotatably connected to the frame 1, while the outer end is connected to a body 71 for winding the conveyor belt.

[0042] The switching output of the transmission ratio switching unit 6 is as follows: When the planetary gear carrier 62 axially jumps, it drives one layer of planetary gears 63 to mesh with the corresponding ring gear 611 on the ring gear carrier 61, forming a power transmission path: driven wheel 32 → ring gear carrier 61 → one layer of planetary gears 63 meshing with the ring gear → one layer of sun gear 64 meshing with the rotating planetary gears 63 → prism 72 of output wheel 7 → body 71 → roller. By designing different gear ratios for different levels, different output speeds can be achieved. Each time the motor reverses, it drives the movable rotating ratchet 532 to jump one step, thereby switching a gear.

[0043] Working principle: Motor forward rotation operation: When the dual-axis motor 2 rotates forward (counterclockwise), both the drum and the fan are in normal operating rotation. At this time, the dual-axis motor 2 drives the drive wheel 31 to rotate synchronously, and the driven wheel 32 rotates synchronously forward in the same direction as the drive wheel 31, driven by the conveyor belt 33. The fixed ratchet B525 drives the movable ratchet B523, thereby driving the sleeve component 51 to rotate forward as well. At this time, the rocker arm 5263 in the ratchet structure 526 is pressed back into the mounting groove B322 by the conveyor belt 33, and will not obstruct the normal operation of the conveyor belt 33 and the driven wheel 32. At this time, the fixed ratchet A5262 does not interfere with the movable ratchet A.

[0044] Dual-axis motor reverse (clockwise) triggering process: When it is necessary to switch the speed ratio between the roller and the fan, the dual-shaft motor 2 rotates in the opposite direction, and the solenoid valve 41 extends and locks the driven wheel 32. The conveyor belt 33 begins to slip relative to the driven wheel 32. The groove 331 on the inner surface of the slipping conveyor belt 33 hooks the free end of the fallen rocker arm 5263 and flips it up. The flipped rocker arm 5263 drives the entire eccentric wheel 5261 to rotate around its hinge point, causing its long axis, which is equipped with a fixed ratchet A5262, to rotate towards the position of the movable ratchet A521 on the sleeve component 51, and then engage with the radially extended movable ratchet A521 on the sleeve component 51. The conveyor belt 33 continues to move, driving the sleeve component 51 to rotate "forward" (i.e., counterclockwise) relative to the locked driven wheel 32 through the rocker arm 5263 and the movable ratchet A521.

[0045] As the sleeve component 51 rotates, the fixed rotating ratchet 531 coaxially connected to it rotates accordingly, and its pawl A5311 climbs along the spiral stepped pawl B5321, pushing the movable rotating ratchet 532 to produce an axial jump. The rotating ratchet 532 drives the planetary gear carrier 62 and the sun gear 64 to move axially, causing the planetary gears 63 of different layers to mesh with the corresponding gear rings 611. This changes the meshing of the planetary gears 63 and gear rings 611, thus switching the transmission ratio. It should be noted that to reduce the elastic expansion of the conveyor belt 33 when driving the ratchet structure, this solution can reduce the swing angle of the swing arm 5263. When a single swing angle is insufficient to support the transition of jaw A5211 to the next jaw B5221, the swing stroke can be accumulated through repeated forward and reverse rotation of the motor until the transition is complete.

[0046] After the transmission ratio is switched and the motor resumes forward rotation, the movable rotating ratchet 532 is pulled back by the elastic element C535 and re-engages with the fixed rotating ratchet 531, ready for the next gear shift.

[0047] By repeating the above gear shifting process, different output speeds can be cyclically switched to meet different drying needs.

[0048] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention. Working principle: Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A motor assembly for a clothes dryer, comprising: Rack (1); A dual-axis motor (2) is fixed on the frame (1). Its first output end (21) is used to drive the fan, and its second output end (22) is connected to the transmission mechanism (3). The transmission mechanism (3) includes a drive wheel (31) driven by the second output end (22) and a driven wheel (32) rotatably mounted on the frame (1). The drive wheel (31) and the driven wheel (32) are connected by a conveyor belt (33). An anti-reverse mechanism (4) is installed on the frame (1) to prevent the driven wheel (32) from reversing when the dual-shaft motor (2) reverses. Its characteristic is that it further includes: The motion conversion mechanism (5) is installed on the driven wheel (32). When the dual-axis motor (2) reverses, it converts the relative sliding between the conveyor belt (33) and the driven wheel (32) into its own axial leap. The transmission ratio switching unit (6) is driven and connected to the motion conversion mechanism (5), and includes multiple sets of gear pairs with different transmission ratios; the transmission ratio switching unit (6) responds to the axial transition of the motion conversion mechanism (5) and switches to different gear pair meshing for power transmission; The output wheel (7) has its input part slidably inserted through the transmission ratio switching unit (6) so as to rotate synchronously with the switched gear pair.

2. The motor assembly for a clothes dryer according to claim 1, characterized in that, The motion conversion mechanism (5) includes a ratchet switching mechanism, which includes: The sleeve component (51) is rotatably mounted in the driven wheel (32) and has a first end (51a) and a second end (51b). The first ratchet component (52) is disposed on the driven wheel and drivenly connected to the first end (51a) of the sleeve component (51) so that when the dual-shaft motor (2) rotates forward, the sleeve component (51) and the driven wheel (32) rotate synchronously forward, and when the dual-shaft motor (2) rotates in reverse and the driven wheel (32) is locked, the driving force of the conveyor belt (33) is converted into the forward rotation of the sleeve component (51) relative to the driven wheel (32); The second ratchet component (53) is disposed at the second end (51b) of the sleeve component (51) to convert the forward rotation of the sleeve component (51) relative to the driven wheel (32) into an axial transition motion that drives the transmission ratio switching unit (6).

3. The motor assembly for a clothes dryer according to claim 2, characterized in that, The driven wheel (32) is provided with an annular mounting groove A (321) and a plurality of mounting grooves B (322) communicating with the mounting groove A (321). The sleeve component (51) is rotatably housed in the mounting groove A (321), and its first end (51a) has a radially extending mounting groove C (511) on its outer peripheral wall and an axially extending mounting groove D (512) on its end face. The first ratchet component (52) includes: The movable ratchet A (521) is radially extendable in the mounting groove C (511) via the elastic element A (522); The movable ratchet B (523) is axially telescopically mounted in the mounting groove D (512) via the elastic element B (524); Fixed ratchet B (525) is arranged around the bottom of the mounting groove A (321) for engaging with movable ratchet B (523); The ratchet structure (526) is elastically hinged to the mounting groove B (322) by a torsion spring (527); The ratchet structure (526) includes an eccentric wheel (5261), on which a fixed ratchet A (5262) ​​is provided for engaging with the movable ratchet A (521); the rim of the eccentric wheel (5261) also extends a rocker arm (5263), which leans toward the forward rotation direction of the driven wheel (32), and under the preload of the torsion spring (527), the rocker arm (5263) has a tendency to swing outward toward the driven wheel (32).

4. The motor assembly for a clothes dryer according to claim 3, characterized in that, The inner surface of the conveyor belt (33) is provided with a groove (331) that matches the shape of the swing arm (5263). When the driven wheel (32) is locked, the free end of the swing arm (5263) can be embedded in the groove (331) and flipped up by the moving conveyor belt (33).

5. The motor assembly for a clothes dryer according to claim 2, characterized in that, The second ratchet component (53) includes: A fixed rotating ratchet (531) is fixed to the second end (51b) of the sleeve component (51) and has at least one pawl A (5311). The movable rotating ratchet (532) is fixedly connected to the transmission ratio switching unit (6). At least one set of pawls is provided on the end face of the ratchet (531) facing the fixed rotating ratchet (531). Each set of pawls includes at least two pawls B (5321) arranged in a spiral step shape. The pawl A (5311) cooperates with the spiral stepped pawl B (5321) so that when the fixed rotating ratchet (531) rotates relative to the movable rotating ratchet (532), it pushes the movable rotating ratchet (532) to produce an axial jump.

6. The motor assembly for a clothes dryer according to claim 5, characterized in that, The second ratchet component (53) further includes a reset elastic unit, the reset elastic unit comprising: At least one guide post (533) is fixedly connected to the driven wheel (32) and extends axially, and an axially extending groove (5331) is provided on the guide post (533). The slider (534) is fixed on the movable rotating ratchet (532) and slides in the groove (5331); An elastic element C (535) is disposed in the groove (5331) and connected to the slider (534) to provide the movable rotating ratchet (532) with an elastic restoring force that tends to abut against the fixed rotating ratchet (531).

7. The motor assembly for a clothes dryer according to claim 6, characterized in that, The transmission ratio switching unit (6) is a multi-stage speed regulation mechanism, which includes: The gear ring holder (61) is fixedly connected to the guide post (533), and multiple gear rings (611) are fixed inside it along the axial direction. The planetary gear carrier (62) is coaxially and rotatably connected to the movable rotating ratchet (532); Multi-layer planetary gears (63) are rotatably mounted on the planetary gear carrier (62) and correspond to each level of the gear rings (611). Only one layer of the multi-layer planetary gear meshes with the corresponding gear ring. Multiple sun gears (64) are coaxially arranged and can rotate independently, with each sun gear (64) meshing with a corresponding layer of planetary gears (63); When the planetary gear carrier (62) is driven to axially jump by the active rotating ratchet (532), only one layer of planetary gears (63) meshes with the corresponding gear ring (611) to change the transmission path and transmission ratio.

8. The motor assembly for a clothes dryer according to claim 1, characterized in that, The anti-reverse mechanism (4) includes a solenoid valve (41) mounted on the frame (1) and a stop block (42) provided on the end face of the driven wheel (32). When the dual-shaft motor (2) reverses, the valve stem of the solenoid valve (41) extends out and abuts against the stop block (42).

9. The motor assembly for a clothes dryer according to claim 1, characterized in that, The transmission mechanism (3) is a speed reduction mechanism, and the diameter of the driving wheel (31) is smaller than the diameter of the driven wheel (32).

10. The motor assembly for a clothes dryer according to claim 7, characterized in that, The output wheel (7) includes a body (71), and a prism (72) is coaxially arranged on the end face of the body (71). The prism (72) slides through multiple sun gears (64) and its end is rotatably connected to the frame (1).

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