Gearbox and refrigerator

Abstract

Proposed is a gearbox comprising a housing; a motor arranged in the housing and having a rotating shaft; an output shaft with one end extending out of the housing to provide torque externally; a transmission assembly arranged in the housing and connecting the rotating shaft and the output shaft, comprising first to fourth gear transmissions arranged in sequence from the rotating shaft to the output shaft, wherein the first and second gear transmissions are helical gear transmissions, and the third and fourth gear transmissions are straight gear transmissions. The total transmission ratio of the transmission assembly is between 300 and 400, and the normal module of the driving gear and the driven gear of the first to fourth gear transmissions is set to be between 0.6 and 0.8. Also proposed is a refrigerator comprising the gearbox.

Description

Technical Field

[0001] This disclosure relates to the field of electric drives, specifically to the design of a gearbox and a refrigerator including the gearbox. Background Technology

[0002] The current refrigerator market's pursuit of maximum space utilization has severely compressed the space inside the refrigerator door for housing the ice-crushing module (ice bucket assembly). The core driving component of the ice-crushing module typically uses a DC motor gearbox to drive the ice blade shaft. The limited space within the door panel directly constrains the size of the gearbox, making it difficult to arrange multi-stage gears to achieve a high reduction ratio, and further limiting the size of individual gears. Coupled with the inherently limited output power of traditional brushed DC motors, this results in ice-crushing motors on the market generally having an output torque of only 8-10 N·m. This torque level makes them highly susceptible to "ice jamming" when handling larger ice blocks, negatively impacting the user experience.

[0003] To solve this ice-jamming problem, the key lies in significantly increasing the output torque of the gearbox. From a technical perspective, increasing torque usually requires increasing the gearbox's reduction ratio. However, to ensure that the ice-crushing efficiency does not decrease, the speed of the ice blades (i.e., the ice-crushing speed) must remain constant, which places a demand on the drive motor to have a "higher speed." However, increasing the motor speed will directly exacerbate the meshing noise in the gear transmission process, creating a new technical contradiction.

[0004] Therefore, how to design a gearbox that can stably output high torque (e.g., ≥30N・m), effectively control transmission noise, and keep costs under control within the extremely limited space of the refrigerator door panel has become a core technical challenge that urgently needs to be overcome in the current research and development of refrigerator ice crushing modules. Utility Model Content

[0005] Therefore, this disclosure aims to solve the aforementioned problems of existing gearboxes, with the goal of achieving high output torque while taking into account the size and noise issues of the gearbox.

[0006] The gearbox according to this disclosure includes a housing; a motor disposed in the housing and having a rotating shaft; an output shaft extending one end out of the housing to provide torque externally; and a transmission assembly disposed in the housing and connecting the rotating shaft and the output shaft, comprising a first to fourth stage gear transmission arranged sequentially from the rotating shaft to the output shaft, wherein the first and second stage gear transmissions are helical gear transmissions, and the third and fourth stage gear transmissions are spur gear transmissions, wherein the total transmission ratio of the transmission assembly is between 300 and 400, and the normal module of the driving gear and driven gear of the first to fourth stage gear transmissions is set to 0.6-0.8.

[0007] The gearbox according to this disclosure may also have one or more of the following features, individually or in combination.

[0008] For example, according to one embodiment of this disclosure, the rotating shaft and the output shaft are parallel to each other and the distance between them is in the range of 64 mm to 70 mm.

[0009] For example, according to one embodiment of this disclosure, the center distance of the first-stage gear transmission ranges from 14.4 to 29.4 mm, the center distance of the second-stage gear transmission ranges from 18.9 to 30.23 mm, the center distance of the third-stage gear transmission ranges from 19.92 to 31.9 mm, and the center distance of the fourth-stage gear transmission ranges from 17.86 to 28.57 mm.

[0010] For example, according to one embodiment of this disclosure, the rotational speed of the motor's rotating shaft is set to 9000 r / min-13000 r / min.

[0011] For example, according to one embodiment of this disclosure, the gearbox is configured to have a noise level of less than or equal to 60 dBA at a distance of 30 cm during operation.

[0012] For example, according to one embodiment of this disclosure, the end section of the rotating shaft is configured with a D-shaped profile and has a stepped portion, so as to be inserted into the D-shaped center hole of the primary drive gear in a primary gear transmission and to axially abut against the primary drive gear through the stepped portion, thereby driving the primary drive gear to rotate. The rotation direction of the primary drive gear and the rotation direction of the motor are matched such that the axial force generated by the primary drive gear during transmission is directed towards the stepped portion.

[0013] For example, according to one embodiment of this disclosure, a primary driven gear and a secondary driving gear are fixed to a first transmission shaft to rotate synchronously, wherein the primary driven gear and the secondary driving gear have opposite directions of rotation and equal helix angles.

[0014] For example, according to one embodiment of the present disclosure, the housing is provided with a reinforcing boss that abuts against the end of the second transmission shaft to which the secondary driven gear is fixed.

[0015] For example, according to one embodiment of this disclosure, the gearbox further includes a mounting plate that supports and positions a first transmission shaft, a second transmission shaft, and a third transmission shaft, wherein a second-stage driven gear and a third-stage driving gear are fixed to the second transmission shaft for synchronous rotation, and a third-stage driven gear and a fourth-stage driving gear are fixed to the third transmission shaft for synchronous rotation.

[0016] For example, according to one embodiment of the present disclosure, the mounting plate has two parallel end plates and a connecting portion connecting the two end plates, the projections of the two end plates in the direction of rotation axis extension do not overlap at least partially, one end plate is mounted to the shaft extension end of the motor, and the other end plate is used to support and position the first transmission shaft, the second transmission shaft and the third transmission shaft.

[0017] For example, according to one embodiment of this disclosure, a primary driven gear, a secondary driving gear, and a first transmission shaft are integrally injection molded, wherein the primary driven gear and the secondary driving gear are axially spaced apart.

[0018] For example, according to one embodiment of this disclosure, the rotating shaft, the output shaft, the first transmission shaft, the second transmission shaft, and the third transmission shaft are arranged in parallel.

[0019] For example, according to one embodiment of this disclosure, the transmission ratio of each gear transmission stage is greater than 4.

[0020] According to another aspect of this disclosure, a refrigerator is provided, including the gearbox described in any embodiment of this disclosure.

[0021] For example, according to one embodiment of this disclosure, the refrigerator has an ice-crushing module, the ice-crushing module including an ice blade and a gearbox for driving the ice blade. Attached Figure Description

[0022] The above and other features and advantages of this disclosure will become more apparent from the following detailed description of exemplary embodiments taken in conjunction with the accompanying drawings, which are for illustrative purposes only and are not intended to limit the scope of this disclosure in any way. The following drawings are not intentionally drawn to scale with actual dimensions; their focus is on illustrating the gist of this disclosure.

[0023] Figure 1 An exploded view of the gearbox according to this disclosure is shown.

[0024] Figure 2 This is a schematic diagram showing the transmission structure of the gearbox according to the present disclosure.

[0025] Figure 3 A schematic diagram of the structure of the transmission assembly and motor assembled with the mounting plate according to this disclosure is shown.

[0026] Figure 4 A schematic diagram of the structure of the first-stage driven gear, the second-stage driving gear, and the first transmission shaft according to the present disclosure is shown.

[0027] Figure 5 A plan view of the gearbox as disclosed herein is shown from two perspectives.

[0028] Figure 6 A schematic diagram showing the connection structure between the rotating shaft and the first-stage drive wheel is shown.

[0029] Figure 7 A cross-sectional view of a portion of the gearbox is shown.

[0030] Figure 8 The side view of the gearbox is shown, where the two dashed lines represent the central axes of the rotating shaft and the output shaft, respectively.

[0031] In each figure, identical or similar parts are represented by the same reference numerals.

[0032] List of reference numerals

[0033] 100 Gearbox

[0034] 1. Shell

[0035] 11. Reinforced boss

[0036] 2 motors

[0037] 21 Rotation axis

[0038] 211 Step Section

[0039] 311 First-stage drive gear

[0040] 312 First-stage driven gear

[0041] 321 Secondary drive gear

[0042] 322 Second-stage driven gear

[0043] 331 Third-stage drive gear

[0044] 332 Three-stage driven gear

[0045] 341 Fourth-stage drive gear

[0046] 342 Fourth stage driven gear

[0047] 41 First drive shaft

[0048] 411 Gap

[0049] 412 Groove

[0050] 42 Second drive shaft

[0051] 43 Third drive shaft

[0052] 5 Output shaft

[0053] 6 mounting plates

[0054] 61 First end plate

[0055] 62 Second end plate

[0056] 63 Connecting part Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0058] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. The use of terms such as “a,” “an,” or “the” in this patent application specification and claims does not indicate a limitation of quantity, but rather indicates the presence of at least one. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0059] According to one aspect of this disclosure, a gearbox 100 is proposed, such as... Figure 1 As shown, the gearbox 100 includes a housing 1, which may include multiple detachably connected parts, such as a housing body and a cover plate. For example, these multiple parts may be sealed into a single unit by an ultrasonic welding process. The housing 1 may accommodate a motor 2, an output shaft 5, and a transmission assembly connecting the motor 2 and the output shaft 5.

[0060] The motor 2 may be, for example, a DC motor, and may include a rotating shaft 21 that rotates relative to the housing 1. The rotating shaft 21 is used to output torque to a transmission assembly, and further transmit the torque to an output shaft 5 via the transmission assembly. For example, the speed of the motor according to this disclosure may be set to between 9000 r / min and 13000 r / min. The output shaft 5 is, for example, parallel to the rotating shaft 21, with one end extending out of the housing 1 to provide torque externally, for example, to drive the ice blades of an ice-crushing module.

[0061] This disclosure discloses a transmission assembly that converts the high speed of the motor 2 into the high torque (e.g., up to 30 N·m) of the output shaft 5 with acceptable noise levels, while also maintaining the compact size of the entire gearbox, making the gearbox more suitable for the ice crushing module of a refrigerator.

[0062] According to embodiments of this disclosure, the transmission assembly includes first- to fourth-stage gear drives arranged sequentially (in the transmission order) from the rotating shaft 21 to the output shaft 5. Each gear drive has a transmission ratio greater than 1 to convert high speed into high torque. The first and second stage gear drives can be helical gear drives, while the third and fourth stage gear drives can be spur gear drives. Since the first two stages of gear drives are characterized by high speed and low torque, using helical gears offers advantages such as smooth meshing and low noise excitation, making them particularly suitable for high-speed operating conditions. Although axial force is generated, it is small due to the low torque and can be offset by further structural adjustments. Noise can be further controlled by optimizing the tooth profile. The latter two stages of transmission are characterized by low speed and high torque. At lower speeds, spur gears do not generate significant meshing noise and do not produce axial force, resulting in lower cost.

[0063] According to the above settings, the gearbox 100 can be configured such that, in the working state, when the rotation shaft 21 of the motor 2 is at a speed of 9000r / min-13000r / min, the noise measured at a distance of 30cm is less than or equal to 60dBA.

[0064] According to embodiments of this disclosure, the overall transmission ratio of the transmission assembly is, for example, between 300 and 400. Furthermore, the distance between the rotating shaft 21 and the output shaft 5 is set to be less than or equal to 70 mm, for example, 67 ± 3 mm. This is an ideal positioning dimension determined to accommodate a detachable modular structure within the limited overall size of the gearbox. Thus, while achieving this large overall transmission ratio, the entire gearbox 100 can also have a compact layout and small size. This combination of a large transmission ratio and limited size is particularly suitable for applications involving ice crushing modules.

[0065] Specifically, for example, such as Figure 2 As shown, the center distance a1 of the first-stage gear transmission can range from 14.4 to 29.4 mm, the center distance a2 of the second-stage gear transmission can range from 18.9 to 30.23 mm, the center distance a3 of the third-stage gear transmission can range from 19.92 to 31.9 mm, and the center distance a4 of the fourth-stage gear transmission can range from 17.86 to 28.57 mm. It should be noted that... Figure 2 The diagram shown is only a simplified unfolded view of the transmission assembly. In the actual structure, the center distances a1 to a4 are not necessarily aligned in one direction so that they can be directly superimposed (e.g., Figure 1 and Figure 5 As shown, the axes are not in the same plane. In fact, the total distance L between the rotating axis 21 and the output axis 5 is (as shown in the figure). Figure 8 (As shown) is equal to the sum of the projections of the center distances a1 to a4.

[0066] Furthermore, the normal module of both the driving and driven gears in the first to fourth stage gear transmissions can be set to 0.6-0.8. And the transmission ratio of each stage is greater than 4, making the transmission ratios of each stage relatively close, thus resulting in a more uniform transmission ratio distribution and a more stable overall structure.

[0067] For example, a single-stage gear transmission may include a first-stage driving gear 311, both helical gears, and a first-stage driven gear 312. The first-stage driving gear 311 is connected to and rotates synchronously with the rotating shaft 21. The number of teeth of the first-stage driving gear 311 can be set to 14, and the number of teeth of the first-stage driven gear 312 can be set to 57. The normal module of both can be set to 0.7 mm, and the helix angle can be set to 15°. Thus, the transmission ratio of the single-stage gear transmission is 4.07, and the center distance a1 is set to (14+57)×0.7 / 2 / cos15°≈25.72 (within the range of 14.4-29.4 mm).

[0068] The two-stage gear transmission may include a second-stage driving gear 321, which is a helical gear, and a second-stage driven gear 322. Both the second-stage driving gear 321 and the first-stage driven gear 312 are connected to the first transmission shaft 41 to ensure synchronous rotation. The number of teeth on the second-stage driving gear 321 can be set to 14, and the number of teeth on the second-stage driven gear 322 can be set to 59. Their normal modules can be set to 0.7 mm, and their helix angles can be set to 15°. Therefore, the transmission ratio of the two-stage gear transmission is 4.21, and the center distance a2 is set to (14+59)×0.7 / 2 / cos15°≈26.5 mm (within the range of 18.9-30.23 mm).

[0069] The three-stage gear transmission may include a three-stage driving gear 331 (both spur gears) and a three-stage driven gear 332. Both the driving gear 331 and the driven gear 332 are connected to the second transmission shaft 42 to ensure synchronous rotation. The number of teeth on the driving gear 331 can be set to 14, and the number of teeth on the driven gear 332 can be set to 63. Their modules can be set to 0.7 mm. Therefore, the transmission ratio of the three-stage gear transmission is 4.5, and the center distance a3 is set to (14+63)×0.7 / 2=26.98m (within the range of 19.92-31.9mm).

[0070] The four-stage gear transmission may include a four-stage driving gear 341, which is a spur gear, and a four-stage driven gear 342. The four-stage driving gear 341 and the three-stage driven gear 332 are both connected to a third transmission shaft 43 to ensure synchronous rotation. The four-stage driven gear 342 is connected to an output shaft 5 to rotate synchronously with it. The number of teeth on the four-stage driving gear 341 can be set to 12, and the number of teeth on the four-stage driven gear 342 can be set to 57. The module of both can be set to 0.8 mm. Therefore, the transmission ratio of the four-stage gear transmission can be set to 4.75, and the center distance a4 is set to (12+57)×0.8 / 2=28.03 mm (within the range of 17.86-28.57 mm).

[0071] Therefore, the total transmission ratio of the transmission assembly can be set to 4.07 × 4.21 × 4.5 × 4.75 ≈ 366.25 (within the range of 300-400). The total distance L between the rotating shaft 21 and the output shaft 5 (e.g.) Figure 8 (As shown) can be set to 66.85mm (within 67±3mm).

[0072] Furthermore, to further refine the layout, the gearbox 100 may include a mounting plate 6 for supporting and positioning the first transmission shaft 41, the second transmission shaft 42, and the third transmission shaft 43. The first transmission shaft 41 connects the first driven gear 312 and the second driving gear 321 to enable synchronous rotation of the three. The second transmission shaft 42 connects the second driven gear 322 and the third driving gear 331 to enable synchronous rotation of the three. The third transmission shaft 43 connects the third driven gear 332 and the fourth driving gear 341 to enable synchronous rotation of the three. For example, the mounting plate 6 may have corresponding mounting holes for positioning the first transmission shaft 41, the second transmission shaft 42, and the third transmission shaft 43.

[0073] like Figure 3 As shown, the mounting plate 6 may have a parallel first end plate 61 and a second end plate 62, and a connecting portion 63 connecting the first end plate 61 and the second end plate 62. The projections of the first end plate 61 and the second end plate 62 in the extension direction of the rotation shaft 21 do not overlap at least partially. The first end plate 61 is used to support and position the first transmission shaft 41, the second transmission shaft 42, and the third transmission shaft 43, and the second end plate 62 is mounted to the shaft extension end of the motor 2.

[0074] Furthermore, such as Figure 4 As shown, the primary driven gear 312, the secondary driving gear 321, and the first transmission shaft 41 are integrally injection molded, and the primary driven gear 312 and the secondary driving gear 321 are axially spaced apart. To save material and achieve smooth demolding, the portion of the first transmission shaft 41 located between the primary driven gear 312 and the secondary driving gear 321 is provided with opposing notches 411 and opposing grooves 412.

[0075] Based on the structure of the mounting plate 6 and the axially spaced structure of the first-stage driven gear 312 and the second-stage driving gear 321, all shafts of the gearbox (rotation shaft 21, output shaft 5, first transmission shaft 41, second transmission shaft 42 and third transmission shaft 43) are arranged in parallel, thereby achieving a compact axial stacked layout. The lateral dimension of the gearbox 100 is reduced, making it suitable for installation inside the refrigerator ice crushing module assembly.

[0076] By combining the above settings, a size particularly suitable for the ice-crushing module of a refrigerator can be achieved. For example, such as Figure 5 As shown, the length L of the gearbox 100 (e.g., the direction with the larger dimension perpendicular to the rotation shaft 21) is set in the range of 110-120 mm, the width W (e.g., the direction with the smaller dimension perpendicular to the rotation shaft 21) is set in the range of 70-80 mm, and the height H (e.g., the extension direction of the rotation shaft 21) is set in the range of 75-85 mm.

[0077] Furthermore, to address the axial force generated by the helical gear transmission, additional structures can be implemented. For example... Figure 6 As shown, the cross-section of the protruding end of the rotating shaft 21 can be configured as a D-shaped profile, and a step portion 211 can be provided on this end. The end of the rotating shaft 21 can be inserted into the D-shaped center hole of the first-stage drive gear 311 and axially abut against the first-stage drive gear 311 through the step portion 211, thereby driving the first-stage drive gear 311 to rotate. The rotation direction of the first-stage drive gear 311 and the rotation direction of the motor 2 can be matched so that the axial force on itself generated during the transmission of the first-stage drive gear 311 is directed towards the step portion 211. Thus, the step portion 211 cancels the axial force generated by the first drive gear 311 due to helical gear transmission. This structure utilizes the bearing capacity of the motor itself, avoiding the need to add additional bearings or complex structures in the gearbox.

[0078] For example, the first-stage driven gear 312 and the second-stage driving gear 321 can be configured with opposite directions of rotation and equal helix angles. Since the first-stage driven gear 312 and the second-stage driving gear 321 can be fixed to the first transmission shaft 41, the axial forces generated by them due to helical gear transmission are opposite in direction and equal in magnitude, thus canceling each other out. This significantly reduces or even eliminates the net axial load acting on the support bearing of the first transmission shaft 41.

[0079] Furthermore, to counteract the axial force generated by the helical gear transmission in the secondary driven gear 322, a reinforcing boss 11 may be provided on the housing 1. This reinforcing boss 11 may have a greater thickness than other parts of the housing to provide greater strength. The reinforcing boss 11 is located near the end of the second drive shaft 42 where the secondary driven gear 322 is located, to abut against that end of the second drive shaft 42, thereby counteracting the axial force generated by the helical gear transmission in the secondary driven gear 322. The reinforcing boss 11 provides a stable axial support surface for the second drive shaft 42, effectively absorbing residual axial force, preventing the second drive shaft 42 and its gears from shifting, and ensuring gear meshing accuracy and transmission smoothness.

[0080] The embodiments disclosed herein fully utilize existing structures (motor bearings, coaxial helical gear pairs) for offsetting, adding only necessary reinforcing bosses at critical locations, avoiding complex thrust bearings or additional balancing mechanisms, thus achieving high performance while maintaining structural simplicity and cost advantages. This is crucial for home appliance applications requiring miniaturization and low cost. Furthermore, this structure improves system reliability and lifespan, significantly reduces bearing load and ensures stable meshing, substantially improving the gearbox's reliability and lifespan under high-speed, frequent start-stop, and impact load (ice crushing) conditions. Moreover, this structure fully guarantees high-precision meshing and further ensures low noise: because the axial positioning of the transmission components is precise and reliable, it effectively maintains the gear meshing clearance and contact pattern, reducing vibration and impact noise caused by axial movement, further ensuring an overall noise level ≤60 dBA.

[0081] Furthermore, according to another aspect of this disclosure, a refrigerator (not shown) is also proposed, which includes an ice-crushing module comprising a rotatable ice blade for crushing ice. The ice-crushing module may also include a gearbox 100 according to an embodiment of this disclosure for driving the ice blade. For example, the gearbox 100 may provide an output torque of 30 N·m or greater.

[0082] Certain features, structures, or characteristics in one or more embodiments of this disclosure may be appropriately combined.

[0083] The foregoing description is illustrative of the present disclosure and should not be construed as limiting it. While several exemplary embodiments of the present disclosure have been described, those skilled in the art will readily understand that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined in the claims. It should be understood that the foregoing description is illustrative of the present disclosure and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of this disclosure.

Claims

1. A gearbox, characterized in that, include case, The motor is housed within the housing and has a rotating shaft. The output shaft extends out of the housing at one end to provide torque externally. A transmission assembly, disposed within the housing and connecting the rotating shaft and the output shaft, comprises first to fourth stage gear drives arranged sequentially from the rotating shaft to the output shaft, wherein the first and second stage gear drives are helical gear drives, and the third and fourth stage gear drives are spur gear drives. The total transmission ratio of the transmission assembly is between 300 and 400, and the normal module of the driving gear and driven gear of the first to fourth stage gear transmission is set to 0.6-0.

8.

2. The gearbox according to claim 1, characterized in that, The rotating shaft and the output shaft are parallel to each other, and the distance between them is in the range of 64mm to 70mm.

3. The gearbox according to claim 2, characterized in that, The center distance of a single-stage gear transmission ranges from 14.4 to 29.4 mm, that of a two-stage gear transmission ranges from 18.9 to 30.23 mm, that of a three-stage gear transmission ranges from 19.92 to 31.9 mm, and that of a four-stage gear transmission ranges from 17.86 to 28.57 mm.

4. The gearbox according to claim 2, characterized in that, The rotational speed of the motor's rotating shaft is set to 9000 r / min-13000 r / min.

5. The gearbox according to claim 1, characterized in that, The end section of the rotating shaft is designed with a D-shaped profile and a stepped portion, so as to be inserted into the D-shaped center hole of the first-stage driving gear in the first-stage gear transmission, and to axially abut against the first-stage driving gear through the stepped portion, thereby driving the first-stage driving gear to rotate. The rotation direction of the primary drive gear and the rotation direction of the motor are matched such that the axial force generated by the primary drive gear during transmission is directed toward the stepped portion.

6. The gearbox according to claim 5, characterized in that, The first-stage driven gear and the second-stage driving gear are fixed to the first transmission shaft to rotate synchronously. The first-stage driven gear and the second-stage driving gear have opposite directions of rotation and equal helix angles.

7. The gearbox according to claim 6, characterized in that, The housing is provided with a reinforcing boss, which abuts against the end of the second transmission shaft to which the secondary driven gear is fixed.

8. The gearbox according to claim 1, characterized in that, The gearbox also includes a mounting plate that supports and positions the first transmission shaft, the second transmission shaft, and the third transmission shaft. The second-stage driven gear and the third-stage driving gear are fixed to the second transmission shaft to rotate synchronously, and the third-stage driven gear and the fourth-stage driving gear are fixed to the third transmission shaft to rotate synchronously.

9. The gearbox according to claim 8, characterized in that, The mounting plate has two parallel end plates and a connecting portion connecting the two end plates. The projections of the two end plates in the direction of rotation axis extension do not overlap at least partially. One end plate is mounted to the shaft extension end of the motor, and the other end plate is used to support and position the first transmission shaft, the second transmission shaft, and the third transmission shaft.

10. The gearbox according to claim 9, characterized in that, The first-stage driven gear, the second-stage driving gear, and the first transmission shaft are integrally injection molded, wherein the first-stage driven gear and the second-stage driving gear are axially spaced apart.

11. The gearbox according to claim 10, characterized in that, The rotating shaft, the output shaft, the first transmission shaft, the second transmission shaft, and the third transmission shaft are arranged in parallel.

12. The gearbox according to any one of claims 1-11, characterized in that, The transmission ratio of each gear transmission stage is greater than 4.

13. A refrigerator, characterized in that, Includes the gearbox described in any one of claims 1-12.

14. The refrigerator according to claim 13, characterized in that, The refrigerator has an ice-crushing module, which includes an ice blade and a gearbox for driving the ice blade.

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