Gearbox for Variable Frequency Motor and its Working Method

Abstract

This invention belongs to the field of engineering component technology, and particularly relates to a gearbox for a variable frequency motor and its working method. The invention provides a gearbox for a variable frequency motor, comprising: an input shaft with a rotatable limiting pin rotatably mounted thereon; a transmission gear disc sleeved on the outer wall of the input shaft, and having a limiting groove adapted to the limiting pin; and two clamping members, respectively disposed on both sides of the limiting groove, with the distance between the two clamping members being less than the diameter of the limiting pin. Wherein, if the limiting pin is not inserted into the limiting groove, the transmission gear disc is suitable for axial movement relative to the input shaft; if the limiting pin is inserted into the limiting groove, the two clamping members are deformed by the limiting pin, and the clamping members are suitable for limiting the limiting pin to prevent the transmission gear disc from axially moving relative to the input shaft. Through the cooperation of the clamping members and the limiting pin, it is convenient to detect whether the limiting pin is inserted and fixed with the transmission gear disc, thus improving working efficiency.

Description

Technical Field

[0001] This invention belongs to the field of engineering components technology, specifically relating to transmission devices, and more particularly to gearboxes for variable frequency motors and their working methods. Background Technology

[0002] The primary function of a gearbox is to change the direction of transmission and regulate speed and torque. It transmits power from the input shaft to the output shaft as needed, achieving acceleration or deceleration. It also allows the output shaft to rotate in a different direction than the input shaft, ensuring efficient and stable operation of the power system. A gearbox contains at least two sets of transmission gears, one set fixed to the input shaft and the other fixed to the output shaft, with the two sets meshing with each other.

[0003] In related technologies, during the assembly of a gearbox, a transmission gear disc is fitted onto the outer wall of the input shaft, and a pin is installed on the outer wall of the input shaft. A groove on the transmission gear disc is formed to fit the pin for fixation. However, since this transmission gear disc needs to mesh with another set of transmission gear discs, and it is also necessary to ensure that the groove on the transmission gear disc is properly inserted into the pin, it is necessary to check whether the pin is inserted into the groove after the transmission gear disc meshes with the other set of transmission gear discs.

[0004] Traditional assembly methods often involve tapping the transmission gear plate to observe whether it can continue to move downwards; however, due to the small distance between the transmission gear plate and the outer wall of the gearbox, it is impossible to directly observe with the naked eye whether the pin is inserted into the groove.

[0005] Therefore, how to solve the technical problem of poor assembly stability of traditional transmission gear discs and input shafts is an urgent technical problem to be solved in this field.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0007] This disclosure provides at least one gearbox for a variable frequency motor and its operating method.

[0008] In a first aspect, embodiments of this disclosure provide a gearbox for a variable frequency motor, comprising:

[0009] The input shaft has a rotatable limit pin.

[0010] The transmission gear disc is sleeved on the outer wall of the input shaft and has a limiting groove that matches the limiting pin.

[0011] Two clamping members are respectively disposed on both sides of the limiting groove, and the distance between the two clamping members is less than the diameter of the limiting pin;

[0012] If the limit pin is not inserted into the limit groove, the transmission gear plate is suitable for axial movement relative to the input shaft;

[0013] If the limiting pin is inserted into the limiting groove, the two clamping members are squeezed and deformed by the limiting pin. The clamping members are adapted to limit the limiting pin to prevent the transmission gear plate from moving axially relative to the input shaft.

[0014] In one optional embodiment, the limiting groove is semi-circular, and the inner diameter of the limiting groove is larger than the diameter of the limiting pin.

[0015] When the limiting pin abuts against the top wall of the limiting groove, and the input shaft drives the transmission gear disk to rotate, the limiting pin is adapted to rotate relative to the limiting groove.

[0016] In one optional embodiment, the clamping member is arc-shaped, with its lower end disposed on the inner wall of the limiting groove and its upper end penetrating through the limiting groove.

[0017] Among them, the transmission gear sleeve moves downward along the input axis until the limit pin abuts against the inner top wall of the limit groove;

[0018] The two clamping members are adapted to clamp the limiting pin from both sides to prevent the limiting pin from disengaging from the limiting groove.

[0019] In one optional embodiment, an oil storage tank is formed on each of the inner walls of the limiting groove, and one oil storage tank corresponds to one clamping member.

[0020] When the clamping member is deformed by the limiting pin, it is suitable to be inserted into the oil storage tank so that the grease in the oil storage tank flows to the outer wall of the limiting pin.

[0021] In one optional embodiment, the outer wall of the clamping member is provided with a plurality of elongated openings along the length direction, and the elongated openings form an inclined angle with the axis of the limiting pin.

[0022] When the limiting pin rotates relative to the clamping member, the elongated opening is suitable for scraping off excess grease from the outer wall of the limiting pin.

[0023] In one optional embodiment, the input shaft passes through the gearbox housing, and a linkage gear disk is rotatably disposed inside the housing, the linkage gear disk meshing with the transmission gear disk.

[0024] In one alternative embodiment, a housing is provided inside which a linkage gear is rotatably disposed, the linkage gear being sleeved on the outer wall of the output shaft;

[0025] An input shaft extends through the housing, and a limiting pin is rotatably mounted on the input shaft;

[0026] The transmission gear disc is sleeved on the outer wall of the input shaft and has a limiting groove that matches the limiting pin.

[0027] Two clamping members are respectively disposed on both sides of the limiting groove, and the distance between the two clamping members is less than the diameter of the limiting pin;

[0028] The clamping member is arc-shaped, with its lower end set on the inner wall of the limiting groove and its upper end penetrating the limiting groove;

[0029] If the limiting pin is inserted into the limiting groove, the two clamping members are squeezed and deformed by the limiting pin. The clamping members are adapted to limit the limiting pin to prevent the transmission gear plate from moving axially relative to the input shaft.

[0030] In one optional embodiment, the limiting groove is semi-circular, and the inner diameter of the limiting groove is larger than the diameter of the limiting pin.

[0031] When the limiting pin abuts against the top wall of the limiting groove, and the input shaft drives the transmission gear disk to rotate, the limiting pin is adapted to rotate relative to the limiting groove.

[0032] In one optional embodiment, an oil storage tank is formed on each of the inner walls of the limiting groove, and one oil storage tank corresponds to one clamping member.

[0033] When the clamping member is deformed by the limiting pin, it is suitable to be inserted into the oil storage tank so that the grease in the oil storage tank flows to the outer wall of the limiting pin.

[0034] In one optional embodiment, the outer wall of the clamping member is provided with a plurality of elongated openings along the length direction, and the elongated openings form an inclined angle with the axis of the limiting pin.

[0035] When the limiting pin rotates relative to the clamping member, the elongated opening is suitable for scraping off excess grease from the outer wall of the limiting pin.

[0036] Secondly, this disclosure also provides a method for operating a gearbox, the method comprising:

[0037] When assembling the gearbox, the transmission gear disc is fitted onto the outer wall of the input shaft so that the limiting groove is aligned with the limiting pin;

[0038] If the limit pin is not inserted into the limit groove, the transmission gear is suitable for axial movement relative to the input shaft. At this time, when the transmission gear is pulled upward, it is suitable for upward movement relative to the input shaft.

[0039] If the limiting pin is inserted into the limiting groove, the two clamping members are squeezed and deformed by the limiting pin. The clamping members are adapted to limit the limiting pin to prevent the transmission gear plate from moving axially relative to the input shaft.

[0040] The beneficial effects of the present invention are that the gearbox for the variable frequency motor and its working method of the present invention, through the mutual cooperation of the clamping member and the limiting pin, after the limiting pin is inserted into the limiting groove, the clamping member is suitable for limiting the limiting pin and preventing it from detaching from the limiting groove; by pulling the transmission gear plate, the limit pin is judged to be inserted into the limiting groove according to whether it can move upward relative to the input axis, thereby improving the detection efficiency after assembly.

[0041] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained in accordance with the structures particularly pointed out in the description, claims and drawings.

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 A perspective view of a gearbox for a variable frequency motor provided in an embodiment of this disclosure;

[0045] Figure 2 A perspective view of the transmission gear and clamping member provided in an embodiment of this disclosure;

[0046] Figure 3 A sectional front view of the limiting groove and clamping member provided in the embodiments of this disclosure;

[0047] Figure 4 This is a schematic diagram showing the state of the limiting pin inserted into the limiting groove according to an embodiment of this disclosure.

[0048] In the picture:

[0049] 1. Input shaft; 10. Limit pin; 2. Transmission gear plate; 20. Limit groove; 21. Oil reservoir; 3. Clamping element; 30. Long slot; 4. Housing; 5. Linkage gear plate. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

[0051] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0052] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0053] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0054] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0055] Research has revealed a drawback in existing technologies. In the gearbox assembly process, the transmission gear disc is fitted onto the outer wall of the input shaft, with a pin positioned on the outer wall. A groove on the transmission gear disc is designed to fit the pin for fixation. However, since this transmission gear disc needs to mesh with another set of transmission gear discs, and it's crucial to ensure proper engagement between the groove and the pin, it's necessary to check whether the pin is fully inserted into the groove after the transmission gear disc meshes with the other set.

[0056] Traditional testing methods often involve tapping the transmission gear plate and observing whether it can continue to move downwards. However, due to the small distance between the transmission gear plate and the outer wall of the gearbox, it is impossible to directly observe with the naked eye whether the pin is inserted into the groove.

[0057] Therefore, how to solve the technical problem of the inconvenience of fixing the traditional transmission gear plate and input shaft, which is detrimental to detection, is an urgent technical problem to be solved in this field.

[0058] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0059] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0060] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0061] like Figures 1 to 4As shown, some embodiments provide a gearbox for a variable frequency motor, including: an input shaft 1 on which a limiting pin 10 is rotatably mounted; one end of the input shaft 1 is inserted into the gearbox, and both ends of the limiting pin 10 protrude from the outer wall of the input shaft 1; a transmission gear 2, which is sleeved on the outer wall of the input shaft 1 and has a limiting groove 20 adapted to the limiting pin 10; two clamping members 3, which are respectively disposed on both sides of the limiting groove 20, and the distance between the two clamping members 3 is less than the diameter of the limiting pin 10; the clamping members 3 are elastic; wherein, if the limiting pin 10 is not inserted into the limiting groove 20, the transmission gear 2 is adapted to move axially relative to the input shaft 1; when the limiting pin 10 is not limited by the two clamping members 3, the transmission gear 2 is pulled upward, and the transmission gear 2 is adapted to move upward relative to the input shaft 1. If the limiting pin 10 is inserted into the limiting groove 20, the two clamping members 3 are deformed by the limiting pin 10. The clamping members 3 are adapted to limit the limiting pin 10 to prevent the transmission gear 2 from moving axially relative to the input shaft 1. After the limiting pin 10 is limited by the clamping members 3, a positioning ring is sleeved on the outer wall of the input shaft 1 above the transmission gear 2 to further limit the transmission gear 2 and prevent the transmission gear 2 from hitting the gearbox end cover upwards. Through the mutual cooperation between the clamping members 3 and the limiting pin 10, after the limiting pin 10 is inserted into the limiting groove 20, the clamping members 3 are adapted to limit the limiting pin 10 to prevent it from detaching from the limiting groove 20. By pulling the transmission gear 2, the insertion of the limiting pin 10 into the limiting groove 20 can be determined by whether it can move upwards relative to the input shaft 1, thus improving the inspection efficiency after assembly.

[0062] Reference Appendix Figure 2 The limiting groove 20 is semi-circular, and its inner diameter is larger than that of the limiting pin 10. When the limiting pin 10 abuts against the inner top wall of the limiting groove 20, and the input shaft 1 drives the transmission gear 2 to rotate, the limiting pin 10 is adapted to rotate relative to the limiting groove 20. After the limiting pin 10 is inserted into the limiting groove 20, the input shaft 1 is adapted to drive the transmission gear 2 to rotate.

[0063] Continue to refer to the appendix Figure 2 The clamping member 3 is arc-shaped, with its lower end set on the inner wall of the limiting groove 20 and its upper end penetrating the limiting groove 20; (Attached) Figure 2 The transmission gear 2 is positioned with its bottom wall facing upwards. When the transmission gear 2 is fitted onto the outer wall of the input shaft 1, the limiting groove 20 is positioned downwards to allow the limiting pin 10 to be inserted into the corresponding limiting groove 20. The transmission gear 2 moves downwards along the input shaft 1 until the limiting pin 10 abuts against the inner top wall of the limiting groove 20. The limiting pin 10 is adapted to compress the clamping member 3 to deform. The two clamping members 3 are adapted to clamp and limit the limiting pin 10 from both sides to prevent it from disengaging from the limiting groove 20. After assembly, the insertion of the limiting pin 10 into the limiting groove 20 is determined by whether the transmission gear 2 can move upwards when pulled upwards.

[0064] Reference Appendix Figure 3 and Figure 4 Each of the two inner walls of the limiting groove 20 has an oil reservoir 21, and each oil reservoir 21 corresponds to a clamping member 3. Each oil reservoir 21 stores grease, which is suitable for reducing the friction between the limiting pin 10 and the limiting groove 20. (See attached diagram.) Figure 4 When the limiting pin 10 is inserted into the limiting groove 20, the limiting pin 10 exerts a compressive force F on the clamping member 3, such as Figure 4 As shown, when the clamping member 3 is deformed by the limiting pin 10, it is adapted to be inserted into the oil reservoir 21, so that the grease in the oil reservoir 21 flows to the outer wall of the limiting pin 10. During the rotation of the input shaft 1 driving the transmission gear 2, the limiting pin 10 presses against the clamping member 3, causing the grease in the oil reservoir 21 to flow outwards, further reducing the friction between the limiting pin 10 and the limiting groove 20.

[0065] Continue to refer to the appendix Figure 2 The clamping member 3 has several elongated slots 30 along its length on its outer wall, and these slots 30 form an inclined angle with the axis of the limiting pin 10. When the limiting pin 10 rotates relative to the clamping member 3, the elongated slots 30 are suitable for scraping away excess grease from the outer wall of the limiting pin 10. When the limiting pin 10 rotates relative to the input shaft 1, the clamping frame is deformed by the limiting pin 10, and excess grease on the outer wall of the limiting pin 10 is scraped away by the elongated slots 30. Some of the scraped grease flows into the cavity between the clamping member 3 and the limiting groove 20. The solidification of excess grease on the outer wall of the limiting pin 10 due to oxidation affects the clamping and limiting effect of the clamping member 3 on the limiting pin 10, reducing the stability of the clamping member 3 in fixing the limiting pin 10. The scraping of excess grease by the elongated slots 30 improves the stability of the fixation between the limiting pin 10 and the clamping member 3.

[0066] Reference Appendix Figure 1 The input shaft 1 passes through the gearbox housing 4, and a linkage gear disk 5 is rotatably mounted inside the housing 4. The linkage gear disk 5 meshes with the transmission gear disk 2. When assembling the gearbox, the transmission gear disk 2 must not only mesh with the linkage gear disk 5, but also ensure that the limiting pin 10 is inserted into the limiting groove 20. Therefore, the poor assembly stability of the traditional transmission gear disk 2 and input shaft 1 makes it difficult to detect whether the limiting pin 10 is inserted into the limiting groove 20.

[0067] Continue to refer to the appendix Figure 1Some embodiments provide a gearbox for a variable frequency motor, comprising: a housing 4, in which a linkage gear 5 is rotatably disposed, the linkage gear 5 being fitted onto the outer wall of an output shaft; an input shaft 1, which penetrates the housing 4, and a limiting pin 10 is rotatably disposed on the input shaft 1; a transmission gear 2, which is fitted onto the outer wall of the input shaft 1, and has a limiting groove 20 adapted to the limiting pin 10; two clamping members 3, the two clamping members 3 being respectively disposed on both sides of the limiting groove 20, and the distance between the two clamping members 3 being less than the diameter of the limiting pin 10; the clamping members 3 are arc-shaped, with their lower ends disposed on the inner wall of the limiting groove 20, and their upper ends penetrating the limiting groove 20; wherein, if the limiting pin 10 is inserted into the limiting groove 20, the two clamping members 3 are squeezed and deformed by the limiting pin 10, and the clamping members 3 are adapted to limit the limiting pin 10 to prevent the transmission gear 2 from moving axially relative to the input shaft 1.

[0068] Some embodiments provide a method of operating a gearbox, the method comprising:

[0069] When assembling the gearbox, the transmission gear 2 is fitted onto the outer wall of the input shaft 1 so that the limiting groove 20 is aligned with the limiting pin 10. If the limiting pin 10 is not inserted into the limiting groove 20, the transmission gear 2 is suitable for axial movement relative to the input shaft 1. At this time, when the transmission gear 2 is pulled upward, it is suitable for upward movement relative to the input shaft 1. If the limiting pin 10 is inserted into the limiting groove 20, the two clamping members 3 are squeezed and deformed by the limiting pin 10. The clamping members 3 are suitable for limiting the limiting pin 10 to prevent the transmission gear 2 from axially moving relative to the input shaft 1.

[0070] In summary, when assembling the gearbox, the transmission gear plate 2 is fitted onto the outer wall of the input shaft 1 so that the limiting groove 20 is aligned with the limiting pin 10. After the limiting pin 10 is inserted into the limiting groove 20, it presses the two clamping members 3 to deform outward, and the clamping members 3 are suitable for clamping and limiting the limiting pin 10. After the assembly is completed, the transmission gear plate 2 is pulled upward to determine whether the limiting pin 10 is inserted into the limiting groove 20, which improves the efficiency of detection.

[0071] In the description of the embodiments of the present invention, 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 the present invention based on the specific circumstances.

[0072] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0073] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A gearbox for a variable frequency motor, characterized in that, include: The input shaft (1) has a rotatable limit pin (10) on it. The transmission gear plate (2) is sleeved on the outer wall of the input shaft (1) and has a limiting groove (20) that is compatible with the limiting pin (10). Two clamping parts (3) are respectively arranged on both sides of the limiting groove (20), and the distance between the two clamping parts (3) is less than the diameter of the limiting pin (10); If the limiting pin (10) is not inserted into the limiting groove (20), the transmission gear plate (2) is suitable for axial movement relative to the input shaft (1); If the limiting pin (10) is inserted into the limiting groove (20), the two clamping parts (3) are squeezed and deformed by the limiting pin (10). The clamping parts (3) are suitable for limiting the limiting pin (10) to prevent the transmission gear plate (2) from moving axially relative to the input shaft (1). The limiting groove (20) is semi-circular, and the inner diameter of the limiting groove (20) is larger than the diameter of the limiting pin (10); When the limiting pin (10) abuts against the inner top wall of the limiting groove (20), the limiting pin (10) is suitable to rotate relative to the limiting groove (20) when the input shaft (1) drives the transmission gear disk (2) to rotate. The clamping member (3) is arc-shaped, with its lower end set on the inner wall of the limiting groove (20) and its upper end penetrating the limiting groove (20). Among them, the transmission gear plate (2) moves downward along the input shaft (1) until the limiting pin (10) abuts against the inner top wall of the limiting groove (20); The two clamping members (3) are adapted to clamp the limiting pin (10) from both sides to prevent the limiting pin (10) from disengaging from the limiting groove (20); An oil storage tank (21) is provided on each of the inner walls of the limiting groove (20), and one oil storage tank (21) corresponds to one clamping member (3). When the clamping member (3) is deformed by the limiting pin (10), it is suitable to be inserted into the oil storage tank (21) so that the oil in the oil storage tank (21) flows to the outer wall of the limiting pin (10).

2. The gearbox for a variable frequency motor as described in claim 1, characterized in that, The clamping member (3) has a plurality of elongated openings (30) along its length on its outer wall, and the elongated openings (30) and the axis of the limiting pin (10) are inclined at an angle. When the limiting pin (10) rotates relative to the clamping member (3), the elongated opening (30) is suitable for scraping off excess grease from the outer wall of the limiting pin (10).

3. The gearbox for a variable frequency motor as described in claim 1, characterized in that, The input shaft (1) passes through the gearbox housing (4), and a linkage gear disk (5) is rotatably arranged inside the housing (4). The linkage gear disk (5) meshes with the transmission gear disk (2).

4. A gearbox for a variable frequency motor, characterized in that, include: The outer casing (4) has a rotatable gear disc (5) inside, which is fixed to the outer wall of the output shaft; An input shaft (1) passes through the outer casing (4), and a limiting pin (10) is rotatably provided on the input shaft (1). The transmission gear plate (2) is sleeved on the outer wall of the input shaft (1) and has a limiting groove (20) that is compatible with the limiting pin (10). Two clamping parts (3) are respectively arranged on both sides of the limiting groove (20), and the distance between the two clamping parts (3) is less than the diameter of the limiting pin (10); The clamping member (3) is arc-shaped, with its lower end set on the inner wall of the limiting groove (20) and its upper end penetrating the limiting groove (20). If the limiting pin (10) is inserted into the limiting groove (20), the two clamping parts (3) are squeezed and deformed by the limiting pin (10). The clamping parts (3) are suitable for limiting the limiting pin (10) to prevent the transmission gear plate (2) from moving axially relative to the input shaft (1). The limiting groove (20) is semi-circular, and the inner diameter of the limiting groove (20) is larger than the diameter of the limiting pin (10); When the limiting pin (10) abuts against the inner top wall of the limiting groove (20), the limiting pin (10) is suitable to rotate relative to the limiting groove (20) when the input shaft (1) drives the transmission gear disk (2) to rotate. An oil storage tank (21) is provided on each of the inner walls of the limiting groove (20), and one oil storage tank (21) corresponds to one clamping member (3). When the clamping member (3) is deformed by the limiting pin (10), it is suitable to be inserted into the oil storage tank (21) so that the oil in the oil storage tank (21) flows to the outer wall of the limiting pin (10).

5. The gearbox for a variable frequency motor as described in claim 4, characterized in that, The clamping member (3) has a plurality of elongated openings (30) along its length on its outer wall, and the elongated openings (30) and the axis of the limiting pin (10) are inclined at an angle. When the limiting pin (10) rotates relative to the clamping member (3), the elongated opening (30) is suitable for scraping off excess grease from the outer wall of the limiting pin (10).

6. A method for operating a gearbox, characterized in that, The operation method of using the gearbox for a variable frequency motor as described in any one of claims 1-5 includes: When assembling the gearbox, the transmission gear plate (2) is fitted onto the outer wall of the input shaft (1) so that the limiting groove (20) is aligned with the limiting pin (10). If the limit pin (10) is not inserted into the limit groove (20), the transmission gear (2) is suitable for axial movement relative to the input shaft (1). At this time, when the transmission gear (2) is pulled upward, it is suitable for upward movement relative to the input shaft (1). If the limiting pin (10) is inserted into the limiting groove (20), the two clamping parts (3) are squeezed and deformed by the limiting pin (10). The clamping parts (3) are adapted to limit the limiting pin (10) to prevent the transmission gear plate (2) from moving axially relative to the input shaft (1).

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